i386: prepare shared kernel/apm.c
authorThomas Gleixner <tglx@linutronix.de>
Thu, 11 Oct 2007 09:12:52 +0000 (11:12 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 11 Oct 2007 09:12:52 +0000 (11:12 +0200)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/i386/kernel/Makefile
arch/i386/kernel/apm.c [deleted file]
arch/i386/kernel/apm_32.c [new file with mode: 0644]

index 0d329e12a039017d6e1f1ae5b10b99e6ca845f79..ce8dd0ad8a7960b4aa05d37dc797d799bcfeea46 100644 (file)
@@ -17,7 +17,7 @@ obj-$(CONFIG_MCA)             += mca_32.o
 obj-$(CONFIG_X86_MSR)          += msr.o
 obj-$(CONFIG_X86_CPUID)                += cpuid.o
 obj-$(CONFIG_MICROCODE)                += microcode.o
-obj-$(CONFIG_APM)              += apm.o
+obj-$(CONFIG_APM)              += apm_32.o
 obj-$(CONFIG_X86_SMP)          += smp_32.o smpboot_32.o tsc_sync.o
 obj-$(CONFIG_SMP)              += smpcommon_32.o
 obj-$(CONFIG_X86_TRAMPOLINE)   += trampoline.o
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
deleted file mode 100644 (file)
index f02a8ac..0000000
+++ /dev/null
@@ -1,2403 +0,0 @@
-/* -*- linux-c -*-
- * APM BIOS driver for Linux
- * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
- *
- * Initial development of this driver was funded by NEC Australia P/L
- *     and NEC Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * October 1995, Rik Faith (faith@cs.unc.edu):
- *    Minor enhancements and updates (to the patch set) for 1.3.x
- *    Documentation
- * January 1996, Rik Faith (faith@cs.unc.edu):
- *    Make /proc/apm easy to format (bump driver version)
- * March 1996, Rik Faith (faith@cs.unc.edu):
- *    Prohibit APM BIOS calls unless apm_enabled.
- *    (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
- * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
- *    Version 1.0 and 1.1
- * May 1996, Version 1.2
- * Feb 1998, Version 1.3
- * Feb 1998, Version 1.4
- * Aug 1998, Version 1.5
- * Sep 1998, Version 1.6
- * Nov 1998, Version 1.7
- * Jan 1999, Version 1.8
- * Jan 1999, Version 1.9
- * Oct 1999, Version 1.10
- * Nov 1999, Version 1.11
- * Jan 2000, Version 1.12
- * Feb 2000, Version 1.13
- * Nov 2000, Version 1.14
- * Oct 2001, Version 1.15
- * Jan 2002, Version 1.16
- * Oct 2002, Version 1.16ac
- *
- * History:
- *    0.6b: first version in official kernel, Linux 1.3.46
- *    0.7: changed /proc/apm format, Linux 1.3.58
- *    0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
- *    0.9: only call bios if bios is present, Linux 1.3.72
- *    1.0: use fixed device number, consolidate /proc/apm into this file,
- *         Linux 1.3.85
- *    1.1: support user-space standby and suspend, power off after system
- *         halted, Linux 1.3.98
- *    1.2: When resetting RTC after resume, take care so that the time
- *         is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
- *         <jtoth@princeton.edu>); improve interaction between
- *         screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
- *    1.2a:Simple change to stop mysterious bug reports with SMP also added
- *        levels to the printk calls. APM is not defined for SMP machines.
- *         The new replacment for it is, but Linux doesn't yet support this.
- *         Alan Cox Linux 2.1.55
- *    1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
- *    1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
- *         Dean Gaudet <dgaudet@arctic.org>.
- *         C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
- *    1.5: Fix segment register reloading (in case of bad segments saved
- *         across BIOS call).
- *         Stephen Rothwell
- *    1.6: Cope with complier/assembler differences.
- *         Only try to turn off the first display device.
- *         Fix OOPS at power off with no APM BIOS by Jan Echternach
- *                   <echter@informatik.uni-rostock.de>
- *         Stephen Rothwell
- *    1.7: Modify driver's cached copy of the disabled/disengaged flags
- *         to reflect current state of APM BIOS.
- *         Chris Rankin <rankinc@bellsouth.net>
- *         Reset interrupt 0 timer to 100Hz after suspend
- *         Chad Miller <cmiller@surfsouth.com>
- *         Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
- *         Richard Gooch <rgooch@atnf.csiro.au>
- *         Allow boot time disabling of APM
- *         Make boot messages far less verbose by default
- *         Make asm safer
- *         Stephen Rothwell
- *    1.8: Add CONFIG_APM_RTC_IS_GMT
- *         Richard Gooch <rgooch@atnf.csiro.au>
- *         change APM_NOINTS to CONFIG_APM_ALLOW_INTS
- *         remove dependency on CONFIG_PROC_FS
- *         Stephen Rothwell
- *    1.9: Fix small typo.  <laslo@wodip.opole.pl>
- *         Try to cope with BIOS's that need to have all display
- *         devices blanked and not just the first one.
- *         Ross Paterson <ross@soi.city.ac.uk>
- *         Fix segment limit setting it has always been wrong as
- *         the segments needed to have byte granularity.
- *         Mark a few things __init.
- *         Add hack to allow power off of SMP systems by popular request.
- *         Use CONFIG_SMP instead of __SMP__
- *         Ignore BOUNCES for three seconds.
- *         Stephen Rothwell
- *   1.10: Fix for Thinkpad return code.
- *         Merge 2.2 and 2.3 drivers.
- *         Remove APM dependencies in arch/i386/kernel/process.c
- *         Remove APM dependencies in drivers/char/sysrq.c
- *         Reset time across standby.
- *         Allow more inititialisation on SMP.
- *         Remove CONFIG_APM_POWER_OFF and make it boot time
- *         configurable (default on).
- *         Make debug only a boot time parameter (remove APM_DEBUG).
- *         Try to blank all devices on any error.
- *   1.11: Remove APM dependencies in drivers/char/console.c
- *         Check nr_running to detect if we are idle (from
- *         Borislav Deianov <borislav@lix.polytechnique.fr>)
- *         Fix for bioses that don't zero the top part of the
- *         entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
- *         (reported by Panos Katsaloulis <teras@writeme.com>).
- *         Real mode power off patch (Walter Hofmann
- *         <Walter.Hofmann@physik.stud.uni-erlangen.de>).
- *   1.12: Remove CONFIG_SMP as the compiler will optimize
- *         the code away anyway (smp_num_cpus == 1 in UP)
- *         noted by Artur Skawina <skawina@geocities.com>.
- *         Make power off under SMP work again.
- *         Fix thinko with initial engaging of BIOS.
- *         Make sure power off only happens on CPU 0
- *         (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
- *         Do error notification to user mode if BIOS calls fail.
- *         Move entrypoint offset fix to ...boot/setup.S
- *         where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
- *         Remove smp-power-off. SMP users must now specify
- *         "apm=power-off" on the kernel command line. Suggested
- *         by Jim Avera <jima@hal.com>, modified by Alan Cox
- *         <alan@lxorguk.ukuu.org.uk>.
- *         Register the /proc/apm entry even on SMP so that
- *         scripts that check for it before doing power off
- *         work (Jim Avera <jima@hal.com>).
- *   1.13: Changes for new pm_ interfaces (Andy Henroid
- *         <andy_henroid@yahoo.com>).
- *         Modularize the code.
- *         Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
- *         is now the way life works).
- *         Fix thinko in suspend() (wrong return).
- *         Notify drivers on critical suspend.
- *         Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz>
- *         modified by sfr).
- *         Disable interrupts while we are suspended (Andy Henroid
- *         <andy_henroid@yahoo.com> fixed by sfr).
- *         Make power off work on SMP again (Tony Hoyle
- *         <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
- *         Remove CONFIG_APM_SUSPEND_BOUNCE.  The bounce ignore
- *         interval is now configurable.
- *   1.14: Make connection version persist across module unload/load.
- *         Enable and engage power management earlier.
- *         Disengage power management on module unload.
- *         Changed to use the sysrq-register hack for registering the
- *         power off function called by magic sysrq based upon discussions
- *         in irc://irc.openprojects.net/#kernelnewbies
- *         (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
- *         Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
- *         (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
- *         Work around byte swap bug in one of the Vaio's BIOS's
- *         (Marc Boucher <marc@mbsi.ca>).
- *         Exposed the disable flag to dmi so that we can handle known
- *         broken APM (Alan Cox <alan@redhat.com>).
- *   1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
- *         calling it - instead idle. (Alan Cox <alan@redhat.com>)
- *         If an APM idle fails log it and idle sensibly
- *   1.15: Don't queue events to clients who open the device O_WRONLY.
- *         Don't expect replies from clients who open the device O_RDONLY.
- *         (Idea from Thomas Hood)
- *         Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
- *   1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
- *         Notify listeners of standby or suspend events before notifying
- *         drivers. Return EBUSY to ioctl() if suspend is rejected.
- *         (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
- *         Ignore first resume after we generate our own resume event
- *         after a suspend (Thomas Hood)
- *         Daemonize now gets rid of our controlling terminal (sfr).
- *         CONFIG_APM_CPU_IDLE now just affects the default value of
- *         idle_threshold (sfr).
- *         Change name of kernel apm daemon (as it no longer idles) (sfr).
- *   1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
- *        make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
- *        TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
- *
- * APM 1.1 Reference:
- *
- *   Intel Corporation, Microsoft Corporation. Advanced Power Management
- *   (APM) BIOS Interface Specification, Revision 1.1, September 1993.
- *   Intel Order Number 241704-001.  Microsoft Part Number 781-110-X01.
- *
- * [This document is available free from Intel by calling 800.628.8686 (fax
- * 916.356.6100) or 800.548.4725; or via anonymous ftp from
- * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc.  It is also
- * available from Microsoft by calling 206.882.8080.]
- *
- * APM 1.2 Reference:
- *   Intel Corporation, Microsoft Corporation. Advanced Power Management
- *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
- *
- * [This document is available from Microsoft at:
- *    http://www.microsoft.com/whdc/archive/amp_12.mspx]
- */
-
-#include <linux/module.h>
-
-#include <linux/poll.h>
-#include <linux/types.h>
-#include <linux/stddef.h>
-#include <linux/timer.h>
-#include <linux/fcntl.h>
-#include <linux/slab.h>
-#include <linux/stat.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/miscdevice.h>
-#include <linux/apm_bios.h>
-#include <linux/init.h>
-#include <linux/time.h>
-#include <linux/sched.h>
-#include <linux/pm.h>
-#include <linux/pm_legacy.h>
-#include <linux/capability.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/freezer.h>
-#include <linux/smp.h>
-#include <linux/dmi.h>
-#include <linux/suspend.h>
-#include <linux/kthread.h>
-
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/desc.h>
-#include <asm/i8253.h>
-#include <asm/paravirt.h>
-#include <asm/reboot.h>
-
-#include "io_ports.h"
-
-#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
-extern int (*console_blank_hook)(int);
-#endif
-
-/*
- * The apm_bios device is one of the misc char devices.
- * This is its minor number.
- */
-#define        APM_MINOR_DEV   134
-
-/*
- * See Documentation/Config.help for the configuration options.
- *
- * Various options can be changed at boot time as follows:
- * (We allow underscores for compatibility with the modules code)
- *     apm=on/off                      enable/disable APM
- *         [no-]allow[-_]ints          allow interrupts during BIOS calls
- *         [no-]broken[-_]psr          BIOS has a broken GetPowerStatus call
- *         [no-]realmode[-_]power[-_]off       switch to real mode before
- *                                             powering off
- *         [no-]debug                  log some debugging messages
- *         [no-]power[-_]off           power off on shutdown
- *         [no-]smp                    Use apm even on an SMP box
- *         bounce[-_]interval=<n>      number of ticks to ignore suspend
- *                                     bounces
- *          idle[-_]threshold=<n>       System idle percentage above which to
- *                                      make APM BIOS idle calls. Set it to
- *                                      100 to disable.
- *          idle[-_]period=<n>          Period (in 1/100s of a second) over
- *                                      which the idle percentage is
- *                                      calculated.
- */
-
-/* KNOWN PROBLEM MACHINES:
- *
- * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
- *                         [Confirmed by TI representative]
- * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
- *                    [Confirmed by BIOS disassembly]
- *                    [This may work now ...]
- * P: Toshiba 1950S: battery life information only gets updated after resume
- * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
- *     broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
- * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
- *     Neale Banks <neale@lowendale.com.au> December 2000
- *
- * Legend: U = unusable with APM patches
- *         P = partially usable with APM patches
- */
-
-/*
- * Define as 1 to make the driver always call the APM BIOS busy
- * routine even if the clock was not reported as slowed by the
- * idle routine.  Otherwise, define as 0.
- */
-#define ALWAYS_CALL_BUSY   1
-
-/*
- * Define to make the APM BIOS calls zero all data segment registers (so
- * that an incorrect BIOS implementation will cause a kernel panic if it
- * tries to write to arbitrary memory).
- */
-#define APM_ZERO_SEGS
-
-#include "apm.h"
-
-/*
- * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
- * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
- * David Chen <chen@ctpa04.mit.edu>
- */
-#undef INIT_TIMER_AFTER_SUSPEND
-
-#ifdef INIT_TIMER_AFTER_SUSPEND
-#include <linux/timex.h>
-#include <asm/io.h>
-#include <linux/delay.h>
-#endif
-
-/*
- * Need to poll the APM BIOS every second
- */
-#define APM_CHECK_TIMEOUT      (HZ)
-
-/*
- * Ignore suspend events for this amount of time after a resume
- */
-#define DEFAULT_BOUNCE_INTERVAL                (3 * HZ)
-
-/*
- * Maximum number of events stored
- */
-#define APM_MAX_EVENTS         20
-
-/*
- * The per-file APM data
- */
-struct apm_user {
-       int             magic;
-       struct apm_user *       next;
-       unsigned int    suser: 1;
-       unsigned int    writer: 1;
-       unsigned int    reader: 1;
-       unsigned int    suspend_wait: 1;
-       int             suspend_result;
-       int             suspends_pending;
-       int             standbys_pending;
-       int             suspends_read;
-       int             standbys_read;
-       int             event_head;
-       int             event_tail;
-       apm_event_t     events[APM_MAX_EVENTS];
-};
-
-/*
- * The magic number in apm_user
- */
-#define APM_BIOS_MAGIC         0x4101
-
-/*
- * idle percentage above which bios idle calls are done
- */
-#ifdef CONFIG_APM_CPU_IDLE
-#define DEFAULT_IDLE_THRESHOLD 95
-#else
-#define DEFAULT_IDLE_THRESHOLD 100
-#endif
-#define DEFAULT_IDLE_PERIOD    (100 / 3)
-
-/*
- * Local variables
- */
-static struct {
-       unsigned long   offset;
-       unsigned short  segment;
-}                              apm_bios_entry;
-static int                     clock_slowed;
-static int                     idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
-static int                     idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
-static int                     set_pm_idle;
-static int                     suspends_pending;
-static int                     standbys_pending;
-static int                     ignore_sys_suspend;
-static int                     ignore_normal_resume;
-static int                     bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
-
-static int                     debug __read_mostly;
-static int                     smp __read_mostly;
-static int                     apm_disabled = -1;
-#ifdef CONFIG_SMP
-static int                     power_off;
-#else
-static int                     power_off = 1;
-#endif
-#ifdef CONFIG_APM_REAL_MODE_POWER_OFF
-static int                     realmode_power_off = 1;
-#else
-static int                     realmode_power_off;
-#endif
-#ifdef CONFIG_APM_ALLOW_INTS
-static int                     allow_ints = 1;
-#else
-static int                     allow_ints;
-#endif
-static int                     broken_psr;
-
-static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
-static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
-static struct apm_user *       user_list;
-static DEFINE_SPINLOCK(user_list_lock);
-static const struct desc_struct        bad_bios_desc = { 0, 0x00409200 };
-
-static const char              driver_version[] = "1.16ac";    /* no spaces */
-
-static struct task_struct *kapmd_task;
-
-/*
- *     APM event names taken from the APM 1.2 specification. These are
- *     the message codes that the BIOS uses to tell us about events
- */
-static const char *    const apm_event_name[] = {
-       "system standby",
-       "system suspend",
-       "normal resume",
-       "critical resume",
-       "low battery",
-       "power status change",
-       "update time",
-       "critical suspend",
-       "user standby",
-       "user suspend",
-       "system standby resume",
-       "capabilities change"
-};
-#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
-
-typedef struct lookup_t {
-       int     key;
-       char *  msg;
-} lookup_t;
-
-/*
- *     The BIOS returns a set of standard error codes in AX when the
- *     carry flag is set.
- */
-static const lookup_t error_table[] = {
-/* N/A { APM_SUCCESS,          "Operation succeeded" }, */
-       { APM_DISABLED,         "Power management disabled" },
-       { APM_CONNECTED,        "Real mode interface already connected" },
-       { APM_NOT_CONNECTED,    "Interface not connected" },
-       { APM_16_CONNECTED,     "16 bit interface already connected" },
-/* N/A { APM_16_UNSUPPORTED,   "16 bit interface not supported" }, */
-       { APM_32_CONNECTED,     "32 bit interface already connected" },
-       { APM_32_UNSUPPORTED,   "32 bit interface not supported" },
-       { APM_BAD_DEVICE,       "Unrecognized device ID" },
-       { APM_BAD_PARAM,        "Parameter out of range" },
-       { APM_NOT_ENGAGED,      "Interface not engaged" },
-       { APM_BAD_FUNCTION,     "Function not supported" },
-       { APM_RESUME_DISABLED,  "Resume timer disabled" },
-       { APM_BAD_STATE,        "Unable to enter requested state" },
-/* N/A { APM_NO_EVENTS,        "No events pending" }, */
-       { APM_NO_ERROR,         "BIOS did not set a return code" },
-       { APM_NOT_PRESENT,      "No APM present" }
-};
-#define ERROR_COUNT    ARRAY_SIZE(error_table)
-
-/**
- *     apm_error       -       display an APM error
- *     @str: information string
- *     @err: APM BIOS return code
- *
- *     Write a meaningful log entry to the kernel log in the event of
- *     an APM error.
- */
-static void apm_error(char *str, int err)
-{
-       int     i;
-
-       for (i = 0; i < ERROR_COUNT; i++)
-               if (error_table[i].key == err) break;
-       if (i < ERROR_COUNT)
-               printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
-       else
-               printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
-                       str, err);
-}
-
-/*
- * Lock APM functionality to physical CPU 0
- */
-#ifdef CONFIG_SMP
-
-static cpumask_t apm_save_cpus(void)
-{
-       cpumask_t x = current->cpus_allowed;
-       /* Some bioses don't like being called from CPU != 0 */
-       set_cpus_allowed(current, cpumask_of_cpu(0));
-       BUG_ON(smp_processor_id() != 0);
-       return x;
-}
-
-static inline void apm_restore_cpus(cpumask_t mask)
-{
-       set_cpus_allowed(current, mask);
-}
-
-#else
-
-/*
- *     No CPU lockdown needed on a uniprocessor
- */
-#define apm_save_cpus()                (current->cpus_allowed)
-#define apm_restore_cpus(x)    (void)(x)
-
-#endif
-
-/*
- * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
- * apm_info.allow_ints, we are being really paranoid here!  Not only
- * are interrupts disabled, but all the segment registers (except SS)
- * are saved and zeroed this means that if the BIOS tries to reference
- * any data without explicitly loading the segment registers, the kernel
- * will fault immediately rather than have some unforeseen circumstances
- * for the rest of the kernel.  And it will be very obvious!  :-) Doing
- * this depends on CS referring to the same physical memory as DS so that
- * DS can be zeroed before the call. Unfortunately, we can't do anything
- * about the stack segment/pointer.  Also, we tell the compiler that
- * everything could change.
- *
- * Also, we KNOW that for the non error case of apm_bios_call, there
- * is no useful data returned in the low order 8 bits of eax.
- */
-
-static inline unsigned long __apm_irq_save(void)
-{
-       unsigned long flags;
-       local_save_flags(flags);
-       if (apm_info.allow_ints) {
-               if (irqs_disabled_flags(flags))
-                       local_irq_enable();
-       } else
-               local_irq_disable();
-
-       return flags;
-}
-
-#define apm_irq_save(flags) \
-       do { flags = __apm_irq_save(); } while (0)
-
-static inline void apm_irq_restore(unsigned long flags)
-{
-       if (irqs_disabled_flags(flags))
-               local_irq_disable();
-       else if (irqs_disabled())
-               local_irq_enable();
-}
-
-#ifdef APM_ZERO_SEGS
-#      define APM_DECL_SEGS \
-               unsigned int saved_fs; unsigned int saved_gs;
-#      define APM_DO_SAVE_SEGS \
-               savesegment(fs, saved_fs); savesegment(gs, saved_gs)
-#      define APM_DO_RESTORE_SEGS \
-               loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
-#else
-#      define APM_DECL_SEGS
-#      define APM_DO_SAVE_SEGS
-#      define APM_DO_RESTORE_SEGS
-#endif
-
-/**
- *     apm_bios_call   -       Make an APM BIOS 32bit call
- *     @func: APM function to execute
- *     @ebx_in: EBX register for call entry
- *     @ecx_in: ECX register for call entry
- *     @eax: EAX register return
- *     @ebx: EBX register return
- *     @ecx: ECX register return
- *     @edx: EDX register return
- *     @esi: ESI register return
- *
- *     Make an APM call using the 32bit protected mode interface. The
- *     caller is responsible for knowing if APM BIOS is configured and
- *     enabled. This call can disable interrupts for a long period of
- *     time on some laptops.  The return value is in AH and the carry
- *     flag is loaded into AL.  If there is an error, then the error
- *     code is returned in AH (bits 8-15 of eax) and this function
- *     returns non-zero.
- */
-static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
-       u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
-{
-       APM_DECL_SEGS
-       unsigned long           flags;
-       cpumask_t               cpus;
-       int                     cpu;
-       struct desc_struct      save_desc_40;
-       struct desc_struct      *gdt;
-
-       cpus = apm_save_cpus();
-       
-       cpu = get_cpu();
-       gdt = get_cpu_gdt_table(cpu);
-       save_desc_40 = gdt[0x40 / 8];
-       gdt[0x40 / 8] = bad_bios_desc;
-
-       apm_irq_save(flags);
-       APM_DO_SAVE_SEGS;
-       apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
-       APM_DO_RESTORE_SEGS;
-       apm_irq_restore(flags);
-       gdt[0x40 / 8] = save_desc_40;
-       put_cpu();
-       apm_restore_cpus(cpus);
-       
-       return *eax & 0xff;
-}
-
-/**
- *     apm_bios_call_simple    -       make a simple APM BIOS 32bit call
- *     @func: APM function to invoke
- *     @ebx_in: EBX register value for BIOS call
- *     @ecx_in: ECX register value for BIOS call
- *     @eax: EAX register on return from the BIOS call
- *
- *     Make a BIOS call that returns one value only, or just status.
- *     If there is an error, then the error code is returned in AH
- *     (bits 8-15 of eax) and this function returns non-zero. This is
- *     used for simpler BIOS operations. This call may hold interrupts
- *     off for a long time on some laptops.
- */
-
-static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
-{
-       u8                      error;
-       APM_DECL_SEGS
-       unsigned long           flags;
-       cpumask_t               cpus;
-       int                     cpu;
-       struct desc_struct      save_desc_40;
-       struct desc_struct      *gdt;
-
-       cpus = apm_save_cpus();
-       
-       cpu = get_cpu();
-       gdt = get_cpu_gdt_table(cpu);
-       save_desc_40 = gdt[0x40 / 8];
-       gdt[0x40 / 8] = bad_bios_desc;
-
-       apm_irq_save(flags);
-       APM_DO_SAVE_SEGS;
-       error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
-       APM_DO_RESTORE_SEGS;
-       apm_irq_restore(flags);
-       gdt[0x40 / 8] = save_desc_40;
-       put_cpu();
-       apm_restore_cpus(cpus);
-       return error;
-}
-
-/**
- *     apm_driver_version      -       APM driver version
- *     @val:   loaded with the APM version on return
- *
- *     Retrieve the APM version supported by the BIOS. This is only
- *     supported for APM 1.1 or higher. An error indicates APM 1.0 is
- *     probably present.
- *
- *     On entry val should point to a value indicating the APM driver
- *     version with the high byte being the major and the low byte the
- *     minor number both in BCD
- *
- *     On return it will hold the BIOS revision supported in the
- *     same format.
- */
-
-static int apm_driver_version(u_short *val)
-{
-       u32     eax;
-
-       if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
-               return (eax >> 8) & 0xff;
-       *val = eax;
-       return APM_SUCCESS;
-}
-
-/**
- *     apm_get_event   -       get an APM event from the BIOS
- *     @event: pointer to the event
- *     @info: point to the event information
- *
- *     The APM BIOS provides a polled information for event
- *     reporting. The BIOS expects to be polled at least every second
- *     when events are pending. When a message is found the caller should
- *     poll until no more messages are present.  However, this causes
- *     problems on some laptops where a suspend event notification is
- *     not cleared until it is acknowledged.
- *
- *     Additional information is returned in the info pointer, providing
- *     that APM 1.2 is in use. If no messges are pending the value 0x80
- *     is returned (No power management events pending).
- */
-static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
-{
-       u32     eax;
-       u32     ebx;
-       u32     ecx;
-       u32     dummy;
-
-       if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
-                       &dummy, &dummy))
-               return (eax >> 8) & 0xff;
-       *event = ebx;
-       if (apm_info.connection_version < 0x0102)
-               *info = ~0; /* indicate info not valid */
-       else
-               *info = ecx;
-       return APM_SUCCESS;
-}
-
-/**
- *     set_power_state -       set the power management state
- *     @what: which items to transition
- *     @state: state to transition to
- *
- *     Request an APM change of state for one or more system devices. The
- *     processor state must be transitioned last of all. what holds the
- *     class of device in the upper byte and the device number (0xFF for
- *     all) for the object to be transitioned.
- *
- *     The state holds the state to transition to, which may in fact
- *     be an acceptance of a BIOS requested state change.
- */
-static int set_power_state(u_short what, u_short state)
-{
-       u32     eax;
-
-       if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
-               return (eax >> 8) & 0xff;
-       return APM_SUCCESS;
-}
-
-/**
- *     set_system_power_state - set system wide power state
- *     @state: which state to enter
- *
- *     Transition the entire system into a new APM power state.
- */
-static int set_system_power_state(u_short state)
-{
-       return set_power_state(APM_DEVICE_ALL, state);
-}
-
-/**
- *     apm_do_idle     -       perform power saving
- *
- *     This function notifies the BIOS that the processor is (in the view
- *     of the OS) idle. It returns -1 in the event that the BIOS refuses
- *     to handle the idle request. On a success the function returns 1
- *     if the BIOS did clock slowing or 0 otherwise.
- */
-static int apm_do_idle(void)
-{
-       u32     eax;
-       u8      ret = 0;
-       int     idled = 0;
-       int     polling;
-
-       polling = !!(current_thread_info()->status & TS_POLLING);
-       if (polling) {
-               current_thread_info()->status &= ~TS_POLLING;
-               /*
-                * TS_POLLING-cleared state must be visible before we
-                * test NEED_RESCHED:
-                */
-               smp_mb();
-       }
-       if (!need_resched()) {
-               idled = 1;
-               ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
-       }
-       if (polling)
-               current_thread_info()->status |= TS_POLLING;
-
-       if (!idled)
-               return 0;
-
-       if (ret) {
-               static unsigned long t;
-
-               /* This always fails on some SMP boards running UP kernels.
-                * Only report the failure the first 5 times.
-                */
-               if (++t < 5)
-               {
-                       printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
-                                       (eax >> 8) & 0xff);
-                       t = jiffies;
-               }
-               return -1;
-       }
-       clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
-       return clock_slowed;
-}
-
-/**
- *     apm_do_busy     -       inform the BIOS the CPU is busy
- *
- *     Request that the BIOS brings the CPU back to full performance. 
- */
-static void apm_do_busy(void)
-{
-       u32     dummy;
-
-       if (clock_slowed || ALWAYS_CALL_BUSY) {
-               (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
-               clock_slowed = 0;
-       }
-}
-
-/*
- * If no process has really been interested in
- * the CPU for some time, we want to call BIOS
- * power management - we probably want
- * to conserve power.
- */
-#define IDLE_CALC_LIMIT   (HZ * 100)
-#define IDLE_LEAKY_MAX    16
-
-static void (*original_pm_idle)(void) __read_mostly;
-
-/**
- * apm_cpu_idle                -       cpu idling for APM capable Linux
- *
- * This is the idling function the kernel executes when APM is available. It 
- * tries to do BIOS powermanagement based on the average system idle time.
- * Furthermore it calls the system default idle routine.
- */
-
-static void apm_cpu_idle(void)
-{
-       static int use_apm_idle; /* = 0 */
-       static unsigned int last_jiffies; /* = 0 */
-       static unsigned int last_stime; /* = 0 */
-
-       int apm_idle_done = 0;
-       unsigned int jiffies_since_last_check = jiffies - last_jiffies;
-       unsigned int bucket;
-
-recalc:
-       if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
-               use_apm_idle = 0;
-               last_jiffies = jiffies;
-               last_stime = current->stime;
-       } else if (jiffies_since_last_check > idle_period) {
-               unsigned int idle_percentage;
-
-               idle_percentage = current->stime - last_stime;
-               idle_percentage *= 100;
-               idle_percentage /= jiffies_since_last_check;
-               use_apm_idle = (idle_percentage > idle_threshold);
-               if (apm_info.forbid_idle)
-                       use_apm_idle = 0;
-               last_jiffies = jiffies;
-               last_stime = current->stime;
-       }
-
-       bucket = IDLE_LEAKY_MAX;
-
-       while (!need_resched()) {
-               if (use_apm_idle) {
-                       unsigned int t;
-
-                       t = jiffies;
-                       switch (apm_do_idle()) {
-                       case 0: apm_idle_done = 1;
-                               if (t != jiffies) {
-                                       if (bucket) {
-                                               bucket = IDLE_LEAKY_MAX;
-                                               continue;
-                                       }
-                               } else if (bucket) {
-                                       bucket--;
-                                       continue;
-                               }
-                               break;
-                       case 1: apm_idle_done = 1;
-                               break;
-                       default: /* BIOS refused */
-                               break;
-                       }
-               }
-               if (original_pm_idle)
-                       original_pm_idle();
-               else
-                       default_idle();
-               jiffies_since_last_check = jiffies - last_jiffies;
-               if (jiffies_since_last_check > idle_period)
-                       goto recalc;
-       }
-
-       if (apm_idle_done)
-               apm_do_busy();
-}
-
-/**
- *     apm_power_off   -       ask the BIOS to power off
- *
- *     Handle the power off sequence. This is the one piece of code we
- *     will execute even on SMP machines. In order to deal with BIOS
- *     bugs we support real mode APM BIOS power off calls. We also make
- *     the SMP call on CPU0 as some systems will only honour this call
- *     on their first cpu.
- */
-static void apm_power_off(void)
-{
-       unsigned char   po_bios_call[] = {
-               0xb8, 0x00, 0x10,       /* movw  $0x1000,ax  */
-               0x8e, 0xd0,             /* movw  ax,ss       */
-               0xbc, 0x00, 0xf0,       /* movw  $0xf000,sp  */
-               0xb8, 0x07, 0x53,       /* movw  $0x5307,ax  */
-               0xbb, 0x01, 0x00,       /* movw  $0x0001,bx  */
-               0xb9, 0x03, 0x00,       /* movw  $0x0003,cx  */
-               0xcd, 0x15              /* int   $0x15       */
-       };
-
-       /* Some bioses don't like being called from CPU != 0 */
-       if (apm_info.realmode_power_off)
-       {
-               (void)apm_save_cpus();
-               machine_real_restart(po_bios_call, sizeof(po_bios_call));
-       }
-       else
-               (void) set_system_power_state(APM_STATE_OFF);
-}
-
-#ifdef CONFIG_APM_DO_ENABLE
-
-/**
- *     apm_enable_power_management - enable BIOS APM power management
- *     @enable: enable yes/no
- *
- *     Enable or disable the APM BIOS power services. 
- */
-static int apm_enable_power_management(int enable)
-{
-       u32     eax;
-
-       if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
-               return APM_NOT_ENGAGED;
-       if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
-                       enable, &eax))
-               return (eax >> 8) & 0xff;
-       if (enable)
-               apm_info.bios.flags &= ~APM_BIOS_DISABLED;
-       else
-               apm_info.bios.flags |= APM_BIOS_DISABLED;
-       return APM_SUCCESS;
-}
-#endif
-
-/**
- *     apm_get_power_status    -       get current power state
- *     @status: returned status
- *     @bat: battery info
- *     @life: estimated life
- *
- *     Obtain the current power status from the APM BIOS. We return a
- *     status which gives the rough battery status, and current power
- *     source. The bat value returned give an estimate as a percentage
- *     of life and a status value for the battery. The estimated life
- *     if reported is a lifetime in secodnds/minutes at current powwer
- *     consumption.
- */
-static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
-{
-       u32     eax;
-       u32     ebx;
-       u32     ecx;
-       u32     edx;
-       u32     dummy;
-
-       if (apm_info.get_power_status_broken)
-               return APM_32_UNSUPPORTED;
-       if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
-                       &eax, &ebx, &ecx, &edx, &dummy))
-               return (eax >> 8) & 0xff;
-       *status = ebx;
-       *bat = ecx;
-       if (apm_info.get_power_status_swabinminutes) {
-               *life = swab16((u16)edx);
-               *life |= 0x8000;
-       } else
-               *life = edx;
-       return APM_SUCCESS;
-}
-
-#if 0
-static int apm_get_battery_status(u_short which, u_short *status,
-                                 u_short *bat, u_short *life, u_short *nbat)
-{
-       u32     eax;
-       u32     ebx;
-       u32     ecx;
-       u32     edx;
-       u32     esi;
-
-       if (apm_info.connection_version < 0x0102) {
-               /* pretend we only have one battery. */
-               if (which != 1)
-                       return APM_BAD_DEVICE;
-               *nbat = 1;
-               return apm_get_power_status(status, bat, life);
-       }
-
-       if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
-                       &ebx, &ecx, &edx, &esi))
-               return (eax >> 8) & 0xff;
-       *status = ebx;
-       *bat = ecx;
-       *life = edx;
-       *nbat = esi;
-       return APM_SUCCESS;
-}
-#endif
-
-/**
- *     apm_engage_power_management     -       enable PM on a device
- *     @device: identity of device
- *     @enable: on/off
- *
- *     Activate or deactive power management on either a specific device
- *     or the entire system (%APM_DEVICE_ALL).
- */
-static int apm_engage_power_management(u_short device, int enable)
-{
-       u32     eax;
-
-       if ((enable == 0) && (device == APM_DEVICE_ALL)
-           && (apm_info.bios.flags & APM_BIOS_DISABLED))
-               return APM_DISABLED;
-       if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
-               return (eax >> 8) & 0xff;
-       if (device == APM_DEVICE_ALL) {
-               if (enable)
-                       apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
-               else
-                       apm_info.bios.flags |= APM_BIOS_DISENGAGED;
-       }
-       return APM_SUCCESS;
-}
-
-#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
-
-/**
- *     apm_console_blank       -       blank the display
- *     @blank: on/off
- *
- *     Attempt to blank the console, firstly by blanking just video device
- *     zero, and if that fails (some BIOSes don't support it) then it blanks
- *     all video devices. Typically the BIOS will do laptop backlight and
- *     monitor powerdown for us.
- */
-static int apm_console_blank(int blank)
-{
-       int error = APM_NOT_ENGAGED; /* silence gcc */
-       int i;
-       u_short state;
-       static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
-
-       state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
-
-       for (i = 0; i < ARRAY_SIZE(dev); i++) {
-               error = set_power_state(dev[i], state);
-
-               if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
-                       return 1;
-
-               if (error == APM_NOT_ENGAGED)
-                       break;
-       }
-
-       if (error == APM_NOT_ENGAGED) {
-               static int tried;
-               int eng_error;
-               if (tried++ == 0) {
-                       eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
-                       if (eng_error) {
-                               apm_error("set display", error);
-                               apm_error("engage interface", eng_error);
-                               return 0;
-                       } else
-                               return apm_console_blank(blank);
-               }
-       }
-       apm_error("set display", error);
-       return 0;
-}
-#endif
-
-static int queue_empty(struct apm_user *as)
-{
-       return as->event_head == as->event_tail;
-}
-
-static apm_event_t get_queued_event(struct apm_user *as)
-{
-       if (++as->event_tail >= APM_MAX_EVENTS)
-               as->event_tail = 0;
-       return as->events[as->event_tail];
-}
-
-static void queue_event(apm_event_t event, struct apm_user *sender)
-{
-       struct apm_user *       as;
-
-       spin_lock(&user_list_lock);
-       if (user_list == NULL)
-               goto out;
-       for (as = user_list; as != NULL; as = as->next) {
-               if ((as == sender) || (!as->reader))
-                       continue;
-               if (++as->event_head >= APM_MAX_EVENTS)
-                       as->event_head = 0;
-
-               if (as->event_head == as->event_tail) {
-                       static int notified;
-
-                       if (notified++ == 0)
-                           printk(KERN_ERR "apm: an event queue overflowed\n");
-                       if (++as->event_tail >= APM_MAX_EVENTS)
-                               as->event_tail = 0;
-               }
-               as->events[as->event_head] = event;
-               if ((!as->suser) || (!as->writer))
-                       continue;
-               switch (event) {
-               case APM_SYS_SUSPEND:
-               case APM_USER_SUSPEND:
-                       as->suspends_pending++;
-                       suspends_pending++;
-                       break;
-
-               case APM_SYS_STANDBY:
-               case APM_USER_STANDBY:
-                       as->standbys_pending++;
-                       standbys_pending++;
-                       break;
-               }
-       }
-       wake_up_interruptible(&apm_waitqueue);
-out:
-       spin_unlock(&user_list_lock);
-}
-
-static void reinit_timer(void)
-{
-#ifdef INIT_TIMER_AFTER_SUSPEND
-       unsigned long flags;
-
-       spin_lock_irqsave(&i8253_lock, flags);
-       /* set the clock to HZ */
-       outb_p(0x34, PIT_MODE);         /* binary, mode 2, LSB/MSB, ch 0 */
-       udelay(10);
-       outb_p(LATCH & 0xff, PIT_CH0);  /* LSB */
-       udelay(10);
-       outb(LATCH >> 8, PIT_CH0);      /* MSB */
-       udelay(10);
-       spin_unlock_irqrestore(&i8253_lock, flags);
-#endif
-}
-
-static int suspend(int vetoable)
-{
-       int             err;
-       struct apm_user *as;
-
-       if (pm_send_all(PM_SUSPEND, (void *)3)) {
-               /* Vetoed */
-               if (vetoable) {
-                       if (apm_info.connection_version > 0x100)
-                               set_system_power_state(APM_STATE_REJECT);
-                       err = -EBUSY;
-                       ignore_sys_suspend = 0;
-                       printk(KERN_WARNING "apm: suspend was vetoed.\n");
-                       goto out;
-               }
-               printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
-       }
-
-       device_suspend(PMSG_SUSPEND);
-       local_irq_disable();
-       device_power_down(PMSG_SUSPEND);
-
-       local_irq_enable();
-
-       save_processor_state();
-       err = set_system_power_state(APM_STATE_SUSPEND);
-       ignore_normal_resume = 1;
-       restore_processor_state();
-
-       local_irq_disable();
-       reinit_timer();
-
-       if (err == APM_NO_ERROR)
-               err = APM_SUCCESS;
-       if (err != APM_SUCCESS)
-               apm_error("suspend", err);
-       err = (err == APM_SUCCESS) ? 0 : -EIO;
-       device_power_up();
-       local_irq_enable();
-       device_resume();
-       pm_send_all(PM_RESUME, (void *)0);
-       queue_event(APM_NORMAL_RESUME, NULL);
- out:
-       spin_lock(&user_list_lock);
-       for (as = user_list; as != NULL; as = as->next) {
-               as->suspend_wait = 0;
-               as->suspend_result = err;
-       }
-       spin_unlock(&user_list_lock);
-       wake_up_interruptible(&apm_suspend_waitqueue);
-       return err;
-}
-
-static void standby(void)
-{
-       int     err;
-
-       local_irq_disable();
-       device_power_down(PMSG_SUSPEND);
-       local_irq_enable();
-
-       err = set_system_power_state(APM_STATE_STANDBY);
-       if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
-               apm_error("standby", err);
-
-       local_irq_disable();
-       device_power_up();
-       local_irq_enable();
-}
-
-static apm_event_t get_event(void)
-{
-       int             error;
-       apm_event_t     event = APM_NO_EVENTS; /* silence gcc */
-       apm_eventinfo_t info;
-
-       static int notified;
-
-       /* we don't use the eventinfo */
-       error = apm_get_event(&event, &info);
-       if (error == APM_SUCCESS)
-               return event;
-
-       if ((error != APM_NO_EVENTS) && (notified++ == 0))
-               apm_error("get_event", error);
-
-       return 0;
-}
-
-static void check_events(void)
-{
-       apm_event_t             event;
-       static unsigned long    last_resume;
-       static int              ignore_bounce;
-
-       while ((event = get_event()) != 0) {
-               if (debug) {
-                       if (event <= NR_APM_EVENT_NAME)
-                               printk(KERN_DEBUG "apm: received %s notify\n",
-                                      apm_event_name[event - 1]);
-                       else
-                               printk(KERN_DEBUG "apm: received unknown "
-                                      "event 0x%02x\n", event);
-               }
-               if (ignore_bounce
-                   && ((jiffies - last_resume) > bounce_interval))
-                       ignore_bounce = 0;
-
-               switch (event) {
-               case APM_SYS_STANDBY:
-               case APM_USER_STANDBY:
-                       queue_event(event, NULL);
-                       if (standbys_pending <= 0)
-                               standby();
-                       break;
-
-               case APM_USER_SUSPEND:
-#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
-                       if (apm_info.connection_version > 0x100)
-                               set_system_power_state(APM_STATE_REJECT);
-                       break;
-#endif
-               case APM_SYS_SUSPEND:
-                       if (ignore_bounce) {
-                               if (apm_info.connection_version > 0x100)
-                                       set_system_power_state(APM_STATE_REJECT);
-                               break;
-                       }
-                       /*
-                        * If we are already processing a SUSPEND,
-                        * then further SUSPEND events from the BIOS
-                        * will be ignored.  We also return here to
-                        * cope with the fact that the Thinkpads keep
-                        * sending a SUSPEND event until something else
-                        * happens!
-                        */
-                       if (ignore_sys_suspend)
-                               return;
-                       ignore_sys_suspend = 1;
-                       queue_event(event, NULL);
-                       if (suspends_pending <= 0)
-                               (void) suspend(1);
-                       break;
-
-               case APM_NORMAL_RESUME:
-               case APM_CRITICAL_RESUME:
-               case APM_STANDBY_RESUME:
-                       ignore_sys_suspend = 0;
-                       last_resume = jiffies;
-                       ignore_bounce = 1;
-                       if ((event != APM_NORMAL_RESUME)
-                           || (ignore_normal_resume == 0)) {
-                               device_resume();
-                               pm_send_all(PM_RESUME, (void *)0);
-                               queue_event(event, NULL);
-                       }
-                       ignore_normal_resume = 0;
-                       break;
-
-               case APM_CAPABILITY_CHANGE:
-               case APM_LOW_BATTERY:
-               case APM_POWER_STATUS_CHANGE:
-                       queue_event(event, NULL);
-                       /* If needed, notify drivers here */
-                       break;
-
-               case APM_UPDATE_TIME:
-                       break;
-
-               case APM_CRITICAL_SUSPEND:
-                       /*
-                        * We are not allowed to reject a critical suspend.
-                        */
-                       (void) suspend(0);
-                       break;
-               }
-       }
-}
-
-static void apm_event_handler(void)
-{
-       static int      pending_count = 4;
-       int             err;
-
-       if ((standbys_pending > 0) || (suspends_pending > 0)) {
-               if ((apm_info.connection_version > 0x100) &&
-                               (pending_count-- <= 0)) {
-                       pending_count = 4;
-                       if (debug)
-                               printk(KERN_DEBUG "apm: setting state busy\n");
-                       err = set_system_power_state(APM_STATE_BUSY);
-                       if (err)
-                               apm_error("busy", err);
-               }
-       } else
-               pending_count = 4;
-       check_events();
-}
-
-/*
- * This is the APM thread main loop.
- */
-
-static void apm_mainloop(void)
-{
-       DECLARE_WAITQUEUE(wait, current);
-
-       add_wait_queue(&apm_waitqueue, &wait);
-       set_current_state(TASK_INTERRUPTIBLE);
-       for (;;) {
-               schedule_timeout(APM_CHECK_TIMEOUT);
-               if (kthread_should_stop())
-                       break;
-               /*
-                * Ok, check all events, check for idle (and mark us sleeping
-                * so as not to count towards the load average)..
-                */
-               set_current_state(TASK_INTERRUPTIBLE);
-               apm_event_handler();
-       }
-       remove_wait_queue(&apm_waitqueue, &wait);
-}
-
-static int check_apm_user(struct apm_user *as, const char *func)
-{
-       if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
-               printk(KERN_ERR "apm: %s passed bad filp\n", func);
-               return 1;
-       }
-       return 0;
-}
-
-static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
-{
-       struct apm_user *       as;
-       int                     i;
-       apm_event_t             event;
-
-       as = fp->private_data;
-       if (check_apm_user(as, "read"))
-               return -EIO;
-       if ((int)count < sizeof(apm_event_t))
-               return -EINVAL;
-       if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
-               return -EAGAIN;
-       wait_event_interruptible(apm_waitqueue, !queue_empty(as));
-       i = count;
-       while ((i >= sizeof(event)) && !queue_empty(as)) {
-               event = get_queued_event(as);
-               if (copy_to_user(buf, &event, sizeof(event))) {
-                       if (i < count)
-                               break;
-                       return -EFAULT;
-               }
-               switch (event) {
-               case APM_SYS_SUSPEND:
-               case APM_USER_SUSPEND:
-                       as->suspends_read++;
-                       break;
-
-               case APM_SYS_STANDBY:
-               case APM_USER_STANDBY:
-                       as->standbys_read++;
-                       break;
-               }
-               buf += sizeof(event);
-               i -= sizeof(event);
-       }
-       if (i < count)
-               return count - i;
-       if (signal_pending(current))
-               return -ERESTARTSYS;
-       return 0;
-}
-
-static unsigned int do_poll(struct file *fp, poll_table * wait)
-{
-       struct apm_user * as;
-
-       as = fp->private_data;
-       if (check_apm_user(as, "poll"))
-               return 0;
-       poll_wait(fp, &apm_waitqueue, wait);
-       if (!queue_empty(as))
-               return POLLIN | POLLRDNORM;
-       return 0;
-}
-
-static int do_ioctl(struct inode * inode, struct file *filp,
-                   u_int cmd, u_long arg)
-{
-       struct apm_user *       as;
-
-       as = filp->private_data;
-       if (check_apm_user(as, "ioctl"))
-               return -EIO;
-       if ((!as->suser) || (!as->writer))
-               return -EPERM;
-       switch (cmd) {
-       case APM_IOC_STANDBY:
-               if (as->standbys_read > 0) {
-                       as->standbys_read--;
-                       as->standbys_pending--;
-                       standbys_pending--;
-               } else
-                       queue_event(APM_USER_STANDBY, as);
-               if (standbys_pending <= 0)
-                       standby();
-               break;
-       case APM_IOC_SUSPEND:
-               if (as->suspends_read > 0) {
-                       as->suspends_read--;
-                       as->suspends_pending--;
-                       suspends_pending--;
-               } else
-                       queue_event(APM_USER_SUSPEND, as);
-               if (suspends_pending <= 0) {
-                       return suspend(1);
-               } else {
-                       as->suspend_wait = 1;
-                       wait_event_interruptible(apm_suspend_waitqueue,
-                                       as->suspend_wait == 0);
-                       return as->suspend_result;
-               }
-               break;
-       default:
-               return -EINVAL;
-       }
-       return 0;
-}
-
-static int do_release(struct inode * inode, struct file * filp)
-{
-       struct apm_user *       as;
-
-       as = filp->private_data;
-       if (check_apm_user(as, "release"))
-               return 0;
-       filp->private_data = NULL;
-       if (as->standbys_pending > 0) {
-               standbys_pending -= as->standbys_pending;
-               if (standbys_pending <= 0)
-                       standby();
-       }
-       if (as->suspends_pending > 0) {
-               suspends_pending -= as->suspends_pending;
-               if (suspends_pending <= 0)
-                       (void) suspend(1);
-       }
-       spin_lock(&user_list_lock);
-       if (user_list == as)
-               user_list = as->next;
-       else {
-               struct apm_user *       as1;
-
-               for (as1 = user_list;
-                    (as1 != NULL) && (as1->next != as);
-                    as1 = as1->next)
-                       ;
-               if (as1 == NULL)
-                       printk(KERN_ERR "apm: filp not in user list\n");
-               else
-                       as1->next = as->next;
-       }
-       spin_unlock(&user_list_lock);
-       kfree(as);
-       return 0;
-}
-
-static int do_open(struct inode * inode, struct file * filp)
-{
-       struct apm_user *       as;
-
-       as = kmalloc(sizeof(*as), GFP_KERNEL);
-       if (as == NULL) {
-               printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
-                      sizeof(*as));
-               return -ENOMEM;
-       }
-       as->magic = APM_BIOS_MAGIC;
-       as->event_tail = as->event_head = 0;
-       as->suspends_pending = as->standbys_pending = 0;
-       as->suspends_read = as->standbys_read = 0;
-       /*
-        * XXX - this is a tiny bit broken, when we consider BSD
-         * process accounting. If the device is opened by root, we
-        * instantly flag that we used superuser privs. Who knows,
-        * we might close the device immediately without doing a
-        * privileged operation -- cevans
-        */
-       as->suser = capable(CAP_SYS_ADMIN);
-       as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
-       as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
-       spin_lock(&user_list_lock);
-       as->next = user_list;
-       user_list = as;
-       spin_unlock(&user_list_lock);
-       filp->private_data = as;
-       return 0;
-}
-
-static int proc_apm_show(struct seq_file *m, void *v)
-{
-       unsigned short  bx;
-       unsigned short  cx;
-       unsigned short  dx;
-       int             error;
-       unsigned short  ac_line_status = 0xff;
-       unsigned short  battery_status = 0xff;
-       unsigned short  battery_flag   = 0xff;
-       int             percentage     = -1;
-       int             time_units     = -1;
-       char            *units         = "?";
-
-       if ((num_online_cpus() == 1) &&
-           !(error = apm_get_power_status(&bx, &cx, &dx))) {
-               ac_line_status = (bx >> 8) & 0xff;
-               battery_status = bx & 0xff;
-               if ((cx & 0xff) != 0xff)
-                       percentage = cx & 0xff;
-
-               if (apm_info.connection_version > 0x100) {
-                       battery_flag = (cx >> 8) & 0xff;
-                       if (dx != 0xffff) {
-                               units = (dx & 0x8000) ? "min" : "sec";
-                               time_units = dx & 0x7fff;
-                       }
-               }
-       }
-       /* Arguments, with symbols from linux/apm_bios.h.  Information is
-          from the Get Power Status (0x0a) call unless otherwise noted.
-
-          0) Linux driver version (this will change if format changes)
-          1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
-          2) APM flags from APM Installation Check (0x00):
-             bit 0: APM_16_BIT_SUPPORT
-             bit 1: APM_32_BIT_SUPPORT
-             bit 2: APM_IDLE_SLOWS_CLOCK
-             bit 3: APM_BIOS_DISABLED
-             bit 4: APM_BIOS_DISENGAGED
-          3) AC line status
-             0x00: Off-line
-             0x01: On-line
-             0x02: On backup power (BIOS >= 1.1 only)
-             0xff: Unknown
-          4) Battery status
-             0x00: High
-             0x01: Low
-             0x02: Critical
-             0x03: Charging
-             0x04: Selected battery not present (BIOS >= 1.2 only)
-             0xff: Unknown
-          5) Battery flag
-             bit 0: High
-             bit 1: Low
-             bit 2: Critical
-             bit 3: Charging
-             bit 7: No system battery
-             0xff: Unknown
-          6) Remaining battery life (percentage of charge):
-             0-100: valid
-             -1: Unknown
-          7) Remaining battery life (time units):
-             Number of remaining minutes or seconds
-             -1: Unknown
-          8) min = minutes; sec = seconds */
-
-       seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
-                    driver_version,
-                    (apm_info.bios.version >> 8) & 0xff,
-                    apm_info.bios.version & 0xff,
-                    apm_info.bios.flags,
-                    ac_line_status,
-                    battery_status,
-                    battery_flag,
-                    percentage,
-                    time_units,
-                    units);
-       return 0;
-}
-
-static int proc_apm_open(struct inode *inode, struct file *file)
-{
-       return single_open(file, proc_apm_show, NULL);
-}
-
-static const struct file_operations apm_file_ops = {
-       .owner          = THIS_MODULE,
-       .open           = proc_apm_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = single_release,
-};
-
-static int apm(void *unused)
-{
-       unsigned short  bx;
-       unsigned short  cx;
-       unsigned short  dx;
-       int             error;
-       char *          power_stat;
-       char *          bat_stat;
-
-#ifdef CONFIG_SMP
-       /* 2002/08/01 - WT
-        * This is to avoid random crashes at boot time during initialization
-        * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
-        * Some bioses don't like being called from CPU != 0.
-        * Method suggested by Ingo Molnar.
-        */
-       set_cpus_allowed(current, cpumask_of_cpu(0));
-       BUG_ON(smp_processor_id() != 0);
-#endif
-
-       if (apm_info.connection_version == 0) {
-               apm_info.connection_version = apm_info.bios.version;
-               if (apm_info.connection_version > 0x100) {
-                       /*
-                        * We only support BIOSs up to version 1.2
-                        */
-                       if (apm_info.connection_version > 0x0102)
-                               apm_info.connection_version = 0x0102;
-                       error = apm_driver_version(&apm_info.connection_version);
-                       if (error != APM_SUCCESS) {
-                               apm_error("driver version", error);
-                               /* Fall back to an APM 1.0 connection. */
-                               apm_info.connection_version = 0x100;
-                       }
-               }
-       }
-
-       if (debug)
-               printk(KERN_INFO "apm: Connection version %d.%d\n",
-                       (apm_info.connection_version >> 8) & 0xff,
-                       apm_info.connection_version & 0xff);
-
-#ifdef CONFIG_APM_DO_ENABLE
-       if (apm_info.bios.flags & APM_BIOS_DISABLED) {
-               /*
-                * This call causes my NEC UltraLite Versa 33/C to hang if it
-                * is booted with PM disabled but not in the docking station.
-                * Unfortunate ...
-                */
-               error = apm_enable_power_management(1);
-               if (error) {
-                       apm_error("enable power management", error);
-                       return -1;
-               }
-       }
-#endif
-
-       if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
-           && (apm_info.connection_version > 0x0100)) {
-               error = apm_engage_power_management(APM_DEVICE_ALL, 1);
-               if (error) {
-                       apm_error("engage power management", error);
-                       return -1;
-               }
-       }
-
-       if (debug && (num_online_cpus() == 1 || smp )) {
-               error = apm_get_power_status(&bx, &cx, &dx);
-               if (error)
-                       printk(KERN_INFO "apm: power status not available\n");
-               else {
-                       switch ((bx >> 8) & 0xff) {
-                       case 0: power_stat = "off line"; break;
-                       case 1: power_stat = "on line"; break;
-                       case 2: power_stat = "on backup power"; break;
-                       default: power_stat = "unknown"; break;
-                       }
-                       switch (bx & 0xff) {
-                       case 0: bat_stat = "high"; break;
-                       case 1: bat_stat = "low"; break;
-                       case 2: bat_stat = "critical"; break;
-                       case 3: bat_stat = "charging"; break;
-                       default: bat_stat = "unknown"; break;
-                       }
-                       printk(KERN_INFO
-                              "apm: AC %s, battery status %s, battery life ",
-                              power_stat, bat_stat);
-                       if ((cx & 0xff) == 0xff)
-                               printk("unknown\n");
-                       else
-                               printk("%d%%\n", cx & 0xff);
-                       if (apm_info.connection_version > 0x100) {
-                               printk(KERN_INFO
-                                      "apm: battery flag 0x%02x, battery life ",
-                                      (cx >> 8) & 0xff);
-                               if (dx == 0xffff)
-                                       printk("unknown\n");
-                               else
-                                       printk("%d %s\n", dx & 0x7fff,
-                                               (dx & 0x8000) ?
-                                               "minutes" : "seconds");
-                       }
-               }
-       }
-
-       /* Install our power off handler.. */
-       if (power_off)
-               pm_power_off = apm_power_off;
-
-       if (num_online_cpus() == 1 || smp) {
-#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
-               console_blank_hook = apm_console_blank;
-#endif
-               apm_mainloop();
-#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
-               console_blank_hook = NULL;
-#endif
-       }
-
-       return 0;
-}
-
-#ifndef MODULE
-static int __init apm_setup(char *str)
-{
-       int     invert;
-
-       while ((str != NULL) && (*str != '\0')) {
-               if (strncmp(str, "off", 3) == 0)
-                       apm_disabled = 1;
-               if (strncmp(str, "on", 2) == 0)
-                       apm_disabled = 0;
-               if ((strncmp(str, "bounce-interval=", 16) == 0) ||
-                   (strncmp(str, "bounce_interval=", 16) == 0))
-                       bounce_interval = simple_strtol(str + 16, NULL, 0);
-               if ((strncmp(str, "idle-threshold=", 15) == 0) ||
-                   (strncmp(str, "idle_threshold=", 15) == 0))
-                       idle_threshold = simple_strtol(str + 15, NULL, 0);
-               if ((strncmp(str, "idle-period=", 12) == 0) ||
-                   (strncmp(str, "idle_period=", 12) == 0))
-                       idle_period = simple_strtol(str + 12, NULL, 0);
-               invert = (strncmp(str, "no-", 3) == 0) ||
-                       (strncmp(str, "no_", 3) == 0);
-               if (invert)
-                       str += 3;
-               if (strncmp(str, "debug", 5) == 0)
-                       debug = !invert;
-               if ((strncmp(str, "power-off", 9) == 0) ||
-                   (strncmp(str, "power_off", 9) == 0))
-                       power_off = !invert;
-               if (strncmp(str, "smp", 3) == 0)
-               {
-                       smp = !invert;
-                       idle_threshold = 100;
-               }
-               if ((strncmp(str, "allow-ints", 10) == 0) ||
-                   (strncmp(str, "allow_ints", 10) == 0))
-                       apm_info.allow_ints = !invert;
-               if ((strncmp(str, "broken-psr", 10) == 0) ||
-                   (strncmp(str, "broken_psr", 10) == 0))
-                       apm_info.get_power_status_broken = !invert;
-               if ((strncmp(str, "realmode-power-off", 18) == 0) ||
-                   (strncmp(str, "realmode_power_off", 18) == 0))
-                       apm_info.realmode_power_off = !invert;
-               str = strchr(str, ',');
-               if (str != NULL)
-                       str += strspn(str, ", \t");
-       }
-       return 1;
-}
-
-__setup("apm=", apm_setup);
-#endif
-
-static const struct file_operations apm_bios_fops = {
-       .owner          = THIS_MODULE,
-       .read           = do_read,
-       .poll           = do_poll,
-       .ioctl          = do_ioctl,
-       .open           = do_open,
-       .release        = do_release,
-};
-
-static struct miscdevice apm_device = {
-       APM_MINOR_DEV,
-       "apm_bios",
-       &apm_bios_fops
-};
-
-
-/* Simple "print if true" callback */
-static int __init print_if_true(struct dmi_system_id *d)
-{
-       printk("%s\n", d->ident);
-       return 0;
-}
-
-/*
- * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
- * disabled before the suspend. Linux used to get terribly confused by that.
- */
-static int __init broken_ps2_resume(struct dmi_system_id *d)
-{
-       printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
-       return 0;
-}
-
-/* Some bioses have a broken protected mode poweroff and need to use realmode */
-static int __init set_realmode_power_off(struct dmi_system_id *d)
-{
-       if (apm_info.realmode_power_off == 0) {
-               apm_info.realmode_power_off = 1;
-               printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
-       }
-       return 0;
-}
-
-/* Some laptops require interrupts to be enabled during APM calls */
-static int __init set_apm_ints(struct dmi_system_id *d)
-{
-       if (apm_info.allow_ints == 0) {
-               apm_info.allow_ints = 1;
-               printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
-       }
-       return 0;
-}
-
-/* Some APM bioses corrupt memory or just plain do not work */
-static int __init apm_is_horked(struct dmi_system_id *d)
-{
-       if (apm_info.disabled == 0) {
-               apm_info.disabled = 1;
-               printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
-       }
-       return 0;
-}
-
-static int __init apm_is_horked_d850md(struct dmi_system_id *d)
-{
-       if (apm_info.disabled == 0) {
-               apm_info.disabled = 1;
-               printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
-               printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
-               printk(KERN_INFO "download from support.intel.com \n");
-       }
-       return 0;
-}
-
-/* Some APM bioses hang on APM idle calls */
-static int __init apm_likes_to_melt(struct dmi_system_id *d)
-{
-       if (apm_info.forbid_idle == 0) {
-               apm_info.forbid_idle = 1;
-               printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
-       }
-       return 0;
-}
-
-/*
- *  Check for clue free BIOS implementations who use
- *  the following QA technique
- *
- *      [ Write BIOS Code ]<------
- *               |                ^
- *      < Does it Compile >----N--
- *               |Y               ^
- *     < Does it Boot Win98 >-N--
- *               |Y
- *           [Ship It]
- *
- *     Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
- *     Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
- */
-static int __init broken_apm_power(struct dmi_system_id *d)
-{
-       apm_info.get_power_status_broken = 1;
-       printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
-       return 0;
-}
-
-/*
- * This bios swaps the APM minute reporting bytes over (Many sony laptops
- * have this problem).
- */
-static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
-{
-       apm_info.get_power_status_swabinminutes = 1;
-       printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
-       return 0;
-}
-
-static struct dmi_system_id __initdata apm_dmi_table[] = {
-       {
-               print_if_true,
-               KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
-       },
-       {       /* Handle problems with APM on the C600 */
-               broken_ps2_resume, "Dell Latitude C600",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
-       },
-       {       /* Allow interrupts during suspend on Dell Latitude laptops*/
-               set_apm_ints, "Dell Latitude",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
-       },
-       {       /* APM crashes */
-               apm_is_horked, "Dell Inspiron 2500",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
-                       DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
-       },
-       {       /* Allow interrupts during suspend on Dell Inspiron laptops*/
-               set_apm_ints, "Dell Inspiron", {
-                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
-       },
-       {       /* Handle problems with APM on Inspiron 5000e */
-               broken_apm_power, "Dell Inspiron 5000e",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "A04"),
-                       DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
-       },
-       {       /* Handle problems with APM on Inspiron 2500 */
-               broken_apm_power, "Dell Inspiron 2500",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "A12"),
-                       DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
-       },
-       {       /* APM crashes */
-               apm_is_horked, "Dell Dimension 4100",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
-                       DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
-                       DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
-       },
-       {       /* Allow interrupts during suspend on Compaq Laptops*/
-               set_apm_ints, "Compaq 12XL125",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
-                       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
-       },
-       {       /* Allow interrupts during APM or the clock goes slow */
-               set_apm_ints, "ASUSTeK",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
-       },
-       {       /* APM blows on shutdown */
-               apm_is_horked, "ABIT KX7-333[R]",
-               {       DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
-                       DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
-       },
-       {       /* APM crashes */
-               apm_is_horked, "Trigem Delhi3",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
-       },
-       {       /* APM crashes */
-               apm_is_horked, "Fujitsu-Siemens",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
-       },
-       {       /* APM crashes */
-               apm_is_horked_d850md, "Intel D850MD",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
-                       DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
-       },
-       {       /* APM crashes */
-               apm_is_horked, "Intel D810EMO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
-                       DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
-       },
-       {       /* APM crashes */
-               apm_is_horked, "Dell XPS-Z",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
-                       DMI_MATCH(DMI_BIOS_VERSION, "A11"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
-       },
-       {       /* APM crashes */
-               apm_is_horked, "Sharp PC-PJ/AX",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
-                       DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
-                       DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
-       },
-       {       /* APM crashes */
-               apm_is_horked, "Dell Inspiron 2500",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
-                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
-                       DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
-       },
-       {       /* APM idle hangs */
-               apm_likes_to_melt, "Jabil AMD",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
-                       DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
-       },
-       {       /* APM idle hangs */
-               apm_likes_to_melt, "AMI Bios",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
-                       DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
-                       DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-N505VX */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
-                       DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-XG29 */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
-                       DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-Z600NE */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
-                       DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-Z600NE */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
-                       DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
-                       DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-Z505LS */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
-                       DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-Z505LS */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
-                       DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
-                       DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-F104K */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
-                       DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
-       },
-
-       {       /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
-                       DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-C1VE */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
-                       DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
-       },
-       {       /* Handle problems with APM on Sony Vaio PCG-C1VE */
-               swab_apm_power_in_minutes, "Sony VAIO",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-                       DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
-                       DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
-       },
-       {       /* broken PM poweroff bios */
-               set_realmode_power_off, "Award Software v4.60 PGMA",
-               {       DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
-                       DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
-                       DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
-       },
-
-       /* Generic per vendor APM settings  */
-
-       {       /* Allow interrupts during suspend on IBM laptops */
-               set_apm_ints, "IBM",
-               {       DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
-       },
-
-       { }
-};
-
-/*
- * Just start the APM thread. We do NOT want to do APM BIOS
- * calls from anything but the APM thread, if for no other reason
- * than the fact that we don't trust the APM BIOS. This way,
- * most common APM BIOS problems that lead to protection errors
- * etc will have at least some level of being contained...
- *
- * In short, if something bad happens, at least we have a choice
- * of just killing the apm thread..
- */
-static int __init apm_init(void)
-{
-       struct proc_dir_entry *apm_proc;
-       struct desc_struct *gdt;
-       int err;
-
-       dmi_check_system(apm_dmi_table);
-
-       if (apm_info.bios.version == 0 || paravirt_enabled()) {
-               printk(KERN_INFO "apm: BIOS not found.\n");
-               return -ENODEV;
-       }
-       printk(KERN_INFO
-               "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
-               ((apm_info.bios.version >> 8) & 0xff),
-               (apm_info.bios.version & 0xff),
-               apm_info.bios.flags,
-               driver_version);
-       if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
-               printk(KERN_INFO "apm: no 32 bit BIOS support\n");
-               return -ENODEV;
-       }
-
-       if (allow_ints)
-               apm_info.allow_ints = 1;
-       if (broken_psr)
-               apm_info.get_power_status_broken = 1;
-       if (realmode_power_off)
-               apm_info.realmode_power_off = 1;
-       /* User can override, but default is to trust DMI */
-       if (apm_disabled != -1)
-               apm_info.disabled = apm_disabled;
-
-       /*
-        * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
-        * but is reportedly a 1.0 BIOS.
-        */
-       if (apm_info.bios.version == 0x001)
-               apm_info.bios.version = 0x100;
-
-       /* BIOS < 1.2 doesn't set cseg_16_len */
-       if (apm_info.bios.version < 0x102)
-               apm_info.bios.cseg_16_len = 0; /* 64k */
-
-       if (debug) {
-               printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
-                       apm_info.bios.cseg, apm_info.bios.offset,
-                       apm_info.bios.cseg_16, apm_info.bios.dseg);
-               if (apm_info.bios.version > 0x100)
-                       printk(" cseg len %x, dseg len %x",
-                               apm_info.bios.cseg_len,
-                               apm_info.bios.dseg_len);
-               if (apm_info.bios.version > 0x101)
-                       printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
-               printk("\n");
-       }
-
-       if (apm_info.disabled) {
-               printk(KERN_NOTICE "apm: disabled on user request.\n");
-               return -ENODEV;
-       }
-       if ((num_online_cpus() > 1) && !power_off && !smp) {
-               printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
-               apm_info.disabled = 1;
-               return -ENODEV;
-       }
-       if (PM_IS_ACTIVE()) {
-               printk(KERN_NOTICE "apm: overridden by ACPI.\n");
-               apm_info.disabled = 1;
-               return -ENODEV;
-       }
-#ifdef CONFIG_PM_LEGACY
-       pm_active = 1;
-#endif
-
-       /*
-        * Set up a segment that references the real mode segment 0x40
-        * that extends up to the end of page zero (that we have reserved).
-        * This is for buggy BIOS's that refer to (real mode) segment 0x40
-        * even though they are called in protected mode.
-        */
-       set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
-       _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
-
-       /*
-        * Set up the long jump entry point to the APM BIOS, which is called
-        * from inline assembly.
-        */
-       apm_bios_entry.offset = apm_info.bios.offset;
-       apm_bios_entry.segment = APM_CS;
-
-       /*
-        * The APM 1.1 BIOS is supposed to provide limit information that it
-        * recognizes.  Many machines do this correctly, but many others do
-        * not restrict themselves to their claimed limit.  When this happens,
-        * they will cause a segmentation violation in the kernel at boot time.
-        * Most BIOS's, however, will respect a 64k limit, so we use that.
-        *
-        * Note we only set APM segments on CPU zero, since we pin the APM
-        * code to that CPU.
-        */
-       gdt = get_cpu_gdt_table(0);
-       set_base(gdt[APM_CS >> 3],
-                __va((unsigned long)apm_info.bios.cseg << 4));
-       set_base(gdt[APM_CS_16 >> 3],
-                __va((unsigned long)apm_info.bios.cseg_16 << 4));
-       set_base(gdt[APM_DS >> 3],
-                __va((unsigned long)apm_info.bios.dseg << 4));
-
-       apm_proc = create_proc_entry("apm", 0, NULL);
-       if (apm_proc)
-               apm_proc->proc_fops = &apm_file_ops;
-
-       kapmd_task = kthread_create(apm, NULL, "kapmd");
-       if (IS_ERR(kapmd_task)) {
-               printk(KERN_ERR "apm: disabled - Unable to start kernel "
-                               "thread.\n");
-               err = PTR_ERR(kapmd_task);
-               kapmd_task = NULL;
-               remove_proc_entry("apm", NULL);
-               return err;
-       }
-       wake_up_process(kapmd_task);
-
-       if (num_online_cpus() > 1 && !smp ) {
-               printk(KERN_NOTICE
-                  "apm: disabled - APM is not SMP safe (power off active).\n");
-               return 0;
-       }
-
-       /*
-        * Note we don't actually care if the misc_device cannot be registered.
-        * this driver can do its job without it, even if userspace can't
-        * control it.  just log the error
-        */
-       if (misc_register(&apm_device))
-               printk(KERN_WARNING "apm: Could not register misc device.\n");
-
-       if (HZ != 100)
-               idle_period = (idle_period * HZ) / 100;
-       if (idle_threshold < 100) {
-               original_pm_idle = pm_idle;
-               pm_idle  = apm_cpu_idle;
-               set_pm_idle = 1;
-       }
-
-       return 0;
-}
-
-static void __exit apm_exit(void)
-{
-       int     error;
-
-       if (set_pm_idle) {
-               pm_idle = original_pm_idle;
-               /*
-                * We are about to unload the current idle thread pm callback
-                * (pm_idle), Wait for all processors to update cached/local
-                * copies of pm_idle before proceeding.
-                */
-               cpu_idle_wait();
-       }
-       if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
-           && (apm_info.connection_version > 0x0100)) {
-               error = apm_engage_power_management(APM_DEVICE_ALL, 0);
-               if (error)
-                       apm_error("disengage power management", error);
-       }
-       misc_deregister(&apm_device);
-       remove_proc_entry("apm", NULL);
-       if (power_off)
-               pm_power_off = NULL;
-       if (kapmd_task) {
-               kthread_stop(kapmd_task);
-               kapmd_task = NULL;
-       }
-#ifdef CONFIG_PM_LEGACY
-       pm_active = 0;
-#endif
-}
-
-module_init(apm_init);
-module_exit(apm_exit);
-
-MODULE_AUTHOR("Stephen Rothwell");
-MODULE_DESCRIPTION("Advanced Power Management");
-MODULE_LICENSE("GPL");
-module_param(debug, bool, 0644);
-MODULE_PARM_DESC(debug, "Enable debug mode");
-module_param(power_off, bool, 0444);
-MODULE_PARM_DESC(power_off, "Enable power off");
-module_param(bounce_interval, int, 0444);
-MODULE_PARM_DESC(bounce_interval,
-               "Set the number of ticks to ignore suspend bounces");
-module_param(allow_ints, bool, 0444);
-MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
-module_param(broken_psr, bool, 0444);
-MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
-module_param(realmode_power_off, bool, 0444);
-MODULE_PARM_DESC(realmode_power_off,
-               "Switch to real mode before powering off");
-module_param(idle_threshold, int, 0444);
-MODULE_PARM_DESC(idle_threshold,
-       "System idle percentage above which to make APM BIOS idle calls");
-module_param(idle_period, int, 0444);
-MODULE_PARM_DESC(idle_period,
-       "Period (in sec/100) over which to caculate the idle percentage");
-module_param(smp, bool, 0444);
-MODULE_PARM_DESC(smp,
-       "Set this to enable APM use on an SMP platform. Use with caution on older systems");
-MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);
diff --git a/arch/i386/kernel/apm_32.c b/arch/i386/kernel/apm_32.c
new file mode 100644 (file)
index 0000000..f02a8ac
--- /dev/null
@@ -0,0 +1,2403 @@
+/* -*- linux-c -*-
+ * APM BIOS driver for Linux
+ * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
+ *
+ * Initial development of this driver was funded by NEC Australia P/L
+ *     and NEC Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * October 1995, Rik Faith (faith@cs.unc.edu):
+ *    Minor enhancements and updates (to the patch set) for 1.3.x
+ *    Documentation
+ * January 1996, Rik Faith (faith@cs.unc.edu):
+ *    Make /proc/apm easy to format (bump driver version)
+ * March 1996, Rik Faith (faith@cs.unc.edu):
+ *    Prohibit APM BIOS calls unless apm_enabled.
+ *    (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
+ * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
+ *    Version 1.0 and 1.1
+ * May 1996, Version 1.2
+ * Feb 1998, Version 1.3
+ * Feb 1998, Version 1.4
+ * Aug 1998, Version 1.5
+ * Sep 1998, Version 1.6
+ * Nov 1998, Version 1.7
+ * Jan 1999, Version 1.8
+ * Jan 1999, Version 1.9
+ * Oct 1999, Version 1.10
+ * Nov 1999, Version 1.11
+ * Jan 2000, Version 1.12
+ * Feb 2000, Version 1.13
+ * Nov 2000, Version 1.14
+ * Oct 2001, Version 1.15
+ * Jan 2002, Version 1.16
+ * Oct 2002, Version 1.16ac
+ *
+ * History:
+ *    0.6b: first version in official kernel, Linux 1.3.46
+ *    0.7: changed /proc/apm format, Linux 1.3.58
+ *    0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
+ *    0.9: only call bios if bios is present, Linux 1.3.72
+ *    1.0: use fixed device number, consolidate /proc/apm into this file,
+ *         Linux 1.3.85
+ *    1.1: support user-space standby and suspend, power off after system
+ *         halted, Linux 1.3.98
+ *    1.2: When resetting RTC after resume, take care so that the time
+ *         is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
+ *         <jtoth@princeton.edu>); improve interaction between
+ *         screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
+ *    1.2a:Simple change to stop mysterious bug reports with SMP also added
+ *        levels to the printk calls. APM is not defined for SMP machines.
+ *         The new replacment for it is, but Linux doesn't yet support this.
+ *         Alan Cox Linux 2.1.55
+ *    1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
+ *    1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
+ *         Dean Gaudet <dgaudet@arctic.org>.
+ *         C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
+ *    1.5: Fix segment register reloading (in case of bad segments saved
+ *         across BIOS call).
+ *         Stephen Rothwell
+ *    1.6: Cope with complier/assembler differences.
+ *         Only try to turn off the first display device.
+ *         Fix OOPS at power off with no APM BIOS by Jan Echternach
+ *                   <echter@informatik.uni-rostock.de>
+ *         Stephen Rothwell
+ *    1.7: Modify driver's cached copy of the disabled/disengaged flags
+ *         to reflect current state of APM BIOS.
+ *         Chris Rankin <rankinc@bellsouth.net>
+ *         Reset interrupt 0 timer to 100Hz after suspend
+ *         Chad Miller <cmiller@surfsouth.com>
+ *         Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
+ *         Richard Gooch <rgooch@atnf.csiro.au>
+ *         Allow boot time disabling of APM
+ *         Make boot messages far less verbose by default
+ *         Make asm safer
+ *         Stephen Rothwell
+ *    1.8: Add CONFIG_APM_RTC_IS_GMT
+ *         Richard Gooch <rgooch@atnf.csiro.au>
+ *         change APM_NOINTS to CONFIG_APM_ALLOW_INTS
+ *         remove dependency on CONFIG_PROC_FS
+ *         Stephen Rothwell
+ *    1.9: Fix small typo.  <laslo@wodip.opole.pl>
+ *         Try to cope with BIOS's that need to have all display
+ *         devices blanked and not just the first one.
+ *         Ross Paterson <ross@soi.city.ac.uk>
+ *         Fix segment limit setting it has always been wrong as
+ *         the segments needed to have byte granularity.
+ *         Mark a few things __init.
+ *         Add hack to allow power off of SMP systems by popular request.
+ *         Use CONFIG_SMP instead of __SMP__
+ *         Ignore BOUNCES for three seconds.
+ *         Stephen Rothwell
+ *   1.10: Fix for Thinkpad return code.
+ *         Merge 2.2 and 2.3 drivers.
+ *         Remove APM dependencies in arch/i386/kernel/process.c
+ *         Remove APM dependencies in drivers/char/sysrq.c
+ *         Reset time across standby.
+ *         Allow more inititialisation on SMP.
+ *         Remove CONFIG_APM_POWER_OFF and make it boot time
+ *         configurable (default on).
+ *         Make debug only a boot time parameter (remove APM_DEBUG).
+ *         Try to blank all devices on any error.
+ *   1.11: Remove APM dependencies in drivers/char/console.c
+ *         Check nr_running to detect if we are idle (from
+ *         Borislav Deianov <borislav@lix.polytechnique.fr>)
+ *         Fix for bioses that don't zero the top part of the
+ *         entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
+ *         (reported by Panos Katsaloulis <teras@writeme.com>).
+ *         Real mode power off patch (Walter Hofmann
+ *         <Walter.Hofmann@physik.stud.uni-erlangen.de>).
+ *   1.12: Remove CONFIG_SMP as the compiler will optimize
+ *         the code away anyway (smp_num_cpus == 1 in UP)
+ *         noted by Artur Skawina <skawina@geocities.com>.
+ *         Make power off under SMP work again.
+ *         Fix thinko with initial engaging of BIOS.
+ *         Make sure power off only happens on CPU 0
+ *         (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
+ *         Do error notification to user mode if BIOS calls fail.
+ *         Move entrypoint offset fix to ...boot/setup.S
+ *         where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
+ *         Remove smp-power-off. SMP users must now specify
+ *         "apm=power-off" on the kernel command line. Suggested
+ *         by Jim Avera <jima@hal.com>, modified by Alan Cox
+ *         <alan@lxorguk.ukuu.org.uk>.
+ *         Register the /proc/apm entry even on SMP so that
+ *         scripts that check for it before doing power off
+ *         work (Jim Avera <jima@hal.com>).
+ *   1.13: Changes for new pm_ interfaces (Andy Henroid
+ *         <andy_henroid@yahoo.com>).
+ *         Modularize the code.
+ *         Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
+ *         is now the way life works).
+ *         Fix thinko in suspend() (wrong return).
+ *         Notify drivers on critical suspend.
+ *         Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz>
+ *         modified by sfr).
+ *         Disable interrupts while we are suspended (Andy Henroid
+ *         <andy_henroid@yahoo.com> fixed by sfr).
+ *         Make power off work on SMP again (Tony Hoyle
+ *         <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
+ *         Remove CONFIG_APM_SUSPEND_BOUNCE.  The bounce ignore
+ *         interval is now configurable.
+ *   1.14: Make connection version persist across module unload/load.
+ *         Enable and engage power management earlier.
+ *         Disengage power management on module unload.
+ *         Changed to use the sysrq-register hack for registering the
+ *         power off function called by magic sysrq based upon discussions
+ *         in irc://irc.openprojects.net/#kernelnewbies
+ *         (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
+ *         Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
+ *         (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
+ *         Work around byte swap bug in one of the Vaio's BIOS's
+ *         (Marc Boucher <marc@mbsi.ca>).
+ *         Exposed the disable flag to dmi so that we can handle known
+ *         broken APM (Alan Cox <alan@redhat.com>).
+ *   1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
+ *         calling it - instead idle. (Alan Cox <alan@redhat.com>)
+ *         If an APM idle fails log it and idle sensibly
+ *   1.15: Don't queue events to clients who open the device O_WRONLY.
+ *         Don't expect replies from clients who open the device O_RDONLY.
+ *         (Idea from Thomas Hood)
+ *         Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
+ *   1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
+ *         Notify listeners of standby or suspend events before notifying
+ *         drivers. Return EBUSY to ioctl() if suspend is rejected.
+ *         (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
+ *         Ignore first resume after we generate our own resume event
+ *         after a suspend (Thomas Hood)
+ *         Daemonize now gets rid of our controlling terminal (sfr).
+ *         CONFIG_APM_CPU_IDLE now just affects the default value of
+ *         idle_threshold (sfr).
+ *         Change name of kernel apm daemon (as it no longer idles) (sfr).
+ *   1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
+ *        make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
+ *        TODO: determine if its "boot CPU" or "CPU0" we want to lock to.
+ *
+ * APM 1.1 Reference:
+ *
+ *   Intel Corporation, Microsoft Corporation. Advanced Power Management
+ *   (APM) BIOS Interface Specification, Revision 1.1, September 1993.
+ *   Intel Order Number 241704-001.  Microsoft Part Number 781-110-X01.
+ *
+ * [This document is available free from Intel by calling 800.628.8686 (fax
+ * 916.356.6100) or 800.548.4725; or via anonymous ftp from
+ * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc.  It is also
+ * available from Microsoft by calling 206.882.8080.]
+ *
+ * APM 1.2 Reference:
+ *   Intel Corporation, Microsoft Corporation. Advanced Power Management
+ *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.
+ *
+ * [This document is available from Microsoft at:
+ *    http://www.microsoft.com/whdc/archive/amp_12.mspx]
+ */
+
+#include <linux/module.h>
+
+#include <linux/poll.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/timer.h>
+#include <linux/fcntl.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/miscdevice.h>
+#include <linux/apm_bios.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <linux/pm.h>
+#include <linux/pm_legacy.h>
+#include <linux/capability.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/freezer.h>
+#include <linux/smp.h>
+#include <linux/dmi.h>
+#include <linux/suspend.h>
+#include <linux/kthread.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/desc.h>
+#include <asm/i8253.h>
+#include <asm/paravirt.h>
+#include <asm/reboot.h>
+
+#include "io_ports.h"
+
+#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
+extern int (*console_blank_hook)(int);
+#endif
+
+/*
+ * The apm_bios device is one of the misc char devices.
+ * This is its minor number.
+ */
+#define        APM_MINOR_DEV   134
+
+/*
+ * See Documentation/Config.help for the configuration options.
+ *
+ * Various options can be changed at boot time as follows:
+ * (We allow underscores for compatibility with the modules code)
+ *     apm=on/off                      enable/disable APM
+ *         [no-]allow[-_]ints          allow interrupts during BIOS calls
+ *         [no-]broken[-_]psr          BIOS has a broken GetPowerStatus call
+ *         [no-]realmode[-_]power[-_]off       switch to real mode before
+ *                                             powering off
+ *         [no-]debug                  log some debugging messages
+ *         [no-]power[-_]off           power off on shutdown
+ *         [no-]smp                    Use apm even on an SMP box
+ *         bounce[-_]interval=<n>      number of ticks to ignore suspend
+ *                                     bounces
+ *          idle[-_]threshold=<n>       System idle percentage above which to
+ *                                      make APM BIOS idle calls. Set it to
+ *                                      100 to disable.
+ *          idle[-_]period=<n>          Period (in 1/100s of a second) over
+ *                                      which the idle percentage is
+ *                                      calculated.
+ */
+
+/* KNOWN PROBLEM MACHINES:
+ *
+ * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
+ *                         [Confirmed by TI representative]
+ * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
+ *                    [Confirmed by BIOS disassembly]
+ *                    [This may work now ...]
+ * P: Toshiba 1950S: battery life information only gets updated after resume
+ * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
+ *     broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
+ * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
+ *     Neale Banks <neale@lowendale.com.au> December 2000
+ *
+ * Legend: U = unusable with APM patches
+ *         P = partially usable with APM patches
+ */
+
+/*
+ * Define as 1 to make the driver always call the APM BIOS busy
+ * routine even if the clock was not reported as slowed by the
+ * idle routine.  Otherwise, define as 0.
+ */
+#define ALWAYS_CALL_BUSY   1
+
+/*
+ * Define to make the APM BIOS calls zero all data segment registers (so
+ * that an incorrect BIOS implementation will cause a kernel panic if it
+ * tries to write to arbitrary memory).
+ */
+#define APM_ZERO_SEGS
+
+#include "apm.h"
+
+/*
+ * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
+ * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
+ * David Chen <chen@ctpa04.mit.edu>
+ */
+#undef INIT_TIMER_AFTER_SUSPEND
+
+#ifdef INIT_TIMER_AFTER_SUSPEND
+#include <linux/timex.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#endif
+
+/*
+ * Need to poll the APM BIOS every second
+ */
+#define APM_CHECK_TIMEOUT      (HZ)
+
+/*
+ * Ignore suspend events for this amount of time after a resume
+ */
+#define DEFAULT_BOUNCE_INTERVAL                (3 * HZ)
+
+/*
+ * Maximum number of events stored
+ */
+#define APM_MAX_EVENTS         20
+
+/*
+ * The per-file APM data
+ */
+struct apm_user {
+       int             magic;
+       struct apm_user *       next;
+       unsigned int    suser: 1;
+       unsigned int    writer: 1;
+       unsigned int    reader: 1;
+       unsigned int    suspend_wait: 1;
+       int             suspend_result;
+       int             suspends_pending;
+       int             standbys_pending;
+       int             suspends_read;
+       int             standbys_read;
+       int             event_head;
+       int             event_tail;
+       apm_event_t     events[APM_MAX_EVENTS];
+};
+
+/*
+ * The magic number in apm_user
+ */
+#define APM_BIOS_MAGIC         0x4101
+
+/*
+ * idle percentage above which bios idle calls are done
+ */
+#ifdef CONFIG_APM_CPU_IDLE
+#define DEFAULT_IDLE_THRESHOLD 95
+#else
+#define DEFAULT_IDLE_THRESHOLD 100
+#endif
+#define DEFAULT_IDLE_PERIOD    (100 / 3)
+
+/*
+ * Local variables
+ */
+static struct {
+       unsigned long   offset;
+       unsigned short  segment;
+}                              apm_bios_entry;
+static int                     clock_slowed;
+static int                     idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
+static int                     idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
+static int                     set_pm_idle;
+static int                     suspends_pending;
+static int                     standbys_pending;
+static int                     ignore_sys_suspend;
+static int                     ignore_normal_resume;
+static int                     bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
+
+static int                     debug __read_mostly;
+static int                     smp __read_mostly;
+static int                     apm_disabled = -1;
+#ifdef CONFIG_SMP
+static int                     power_off;
+#else
+static int                     power_off = 1;
+#endif
+#ifdef CONFIG_APM_REAL_MODE_POWER_OFF
+static int                     realmode_power_off = 1;
+#else
+static int                     realmode_power_off;
+#endif
+#ifdef CONFIG_APM_ALLOW_INTS
+static int                     allow_ints = 1;
+#else
+static int                     allow_ints;
+#endif
+static int                     broken_psr;
+
+static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
+static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
+static struct apm_user *       user_list;
+static DEFINE_SPINLOCK(user_list_lock);
+static const struct desc_struct        bad_bios_desc = { 0, 0x00409200 };
+
+static const char              driver_version[] = "1.16ac";    /* no spaces */
+
+static struct task_struct *kapmd_task;
+
+/*
+ *     APM event names taken from the APM 1.2 specification. These are
+ *     the message codes that the BIOS uses to tell us about events
+ */
+static const char *    const apm_event_name[] = {
+       "system standby",
+       "system suspend",
+       "normal resume",
+       "critical resume",
+       "low battery",
+       "power status change",
+       "update time",
+       "critical suspend",
+       "user standby",
+       "user suspend",
+       "system standby resume",
+       "capabilities change"
+};
+#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name)
+
+typedef struct lookup_t {
+       int     key;
+       char *  msg;
+} lookup_t;
+
+/*
+ *     The BIOS returns a set of standard error codes in AX when the
+ *     carry flag is set.
+ */
+static const lookup_t error_table[] = {
+/* N/A { APM_SUCCESS,          "Operation succeeded" }, */
+       { APM_DISABLED,         "Power management disabled" },
+       { APM_CONNECTED,        "Real mode interface already connected" },
+       { APM_NOT_CONNECTED,    "Interface not connected" },
+       { APM_16_CONNECTED,     "16 bit interface already connected" },
+/* N/A { APM_16_UNSUPPORTED,   "16 bit interface not supported" }, */
+       { APM_32_CONNECTED,     "32 bit interface already connected" },
+       { APM_32_UNSUPPORTED,   "32 bit interface not supported" },
+       { APM_BAD_DEVICE,       "Unrecognized device ID" },
+       { APM_BAD_PARAM,        "Parameter out of range" },
+       { APM_NOT_ENGAGED,      "Interface not engaged" },
+       { APM_BAD_FUNCTION,     "Function not supported" },
+       { APM_RESUME_DISABLED,  "Resume timer disabled" },
+       { APM_BAD_STATE,        "Unable to enter requested state" },
+/* N/A { APM_NO_EVENTS,        "No events pending" }, */
+       { APM_NO_ERROR,         "BIOS did not set a return code" },
+       { APM_NOT_PRESENT,      "No APM present" }
+};
+#define ERROR_COUNT    ARRAY_SIZE(error_table)
+
+/**
+ *     apm_error       -       display an APM error
+ *     @str: information string
+ *     @err: APM BIOS return code
+ *
+ *     Write a meaningful log entry to the kernel log in the event of
+ *     an APM error.
+ */
+static void apm_error(char *str, int err)
+{
+       int     i;
+
+       for (i = 0; i < ERROR_COUNT; i++)
+               if (error_table[i].key == err) break;
+       if (i < ERROR_COUNT)
+               printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
+       else
+               printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
+                       str, err);
+}
+
+/*
+ * Lock APM functionality to physical CPU 0
+ */
+#ifdef CONFIG_SMP
+
+static cpumask_t apm_save_cpus(void)
+{
+       cpumask_t x = current->cpus_allowed;
+       /* Some bioses don't like being called from CPU != 0 */
+       set_cpus_allowed(current, cpumask_of_cpu(0));
+       BUG_ON(smp_processor_id() != 0);
+       return x;
+}
+
+static inline void apm_restore_cpus(cpumask_t mask)
+{
+       set_cpus_allowed(current, mask);
+}
+
+#else
+
+/*
+ *     No CPU lockdown needed on a uniprocessor
+ */
+#define apm_save_cpus()                (current->cpus_allowed)
+#define apm_restore_cpus(x)    (void)(x)
+
+#endif
+
+/*
+ * These are the actual BIOS calls.  Depending on APM_ZERO_SEGS and
+ * apm_info.allow_ints, we are being really paranoid here!  Not only
+ * are interrupts disabled, but all the segment registers (except SS)
+ * are saved and zeroed this means that if the BIOS tries to reference
+ * any data without explicitly loading the segment registers, the kernel
+ * will fault immediately rather than have some unforeseen circumstances
+ * for the rest of the kernel.  And it will be very obvious!  :-) Doing
+ * this depends on CS referring to the same physical memory as DS so that
+ * DS can be zeroed before the call. Unfortunately, we can't do anything
+ * about the stack segment/pointer.  Also, we tell the compiler that
+ * everything could change.
+ *
+ * Also, we KNOW that for the non error case of apm_bios_call, there
+ * is no useful data returned in the low order 8 bits of eax.
+ */
+
+static inline unsigned long __apm_irq_save(void)
+{
+       unsigned long flags;
+       local_save_flags(flags);
+       if (apm_info.allow_ints) {
+               if (irqs_disabled_flags(flags))
+                       local_irq_enable();
+       } else
+               local_irq_disable();
+
+       return flags;
+}
+
+#define apm_irq_save(flags) \
+       do { flags = __apm_irq_save(); } while (0)
+
+static inline void apm_irq_restore(unsigned long flags)
+{
+       if (irqs_disabled_flags(flags))
+               local_irq_disable();
+       else if (irqs_disabled())
+               local_irq_enable();
+}
+
+#ifdef APM_ZERO_SEGS
+#      define APM_DECL_SEGS \
+               unsigned int saved_fs; unsigned int saved_gs;
+#      define APM_DO_SAVE_SEGS \
+               savesegment(fs, saved_fs); savesegment(gs, saved_gs)
+#      define APM_DO_RESTORE_SEGS \
+               loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
+#else
+#      define APM_DECL_SEGS
+#      define APM_DO_SAVE_SEGS
+#      define APM_DO_RESTORE_SEGS
+#endif
+
+/**
+ *     apm_bios_call   -       Make an APM BIOS 32bit call
+ *     @func: APM function to execute
+ *     @ebx_in: EBX register for call entry
+ *     @ecx_in: ECX register for call entry
+ *     @eax: EAX register return
+ *     @ebx: EBX register return
+ *     @ecx: ECX register return
+ *     @edx: EDX register return
+ *     @esi: ESI register return
+ *
+ *     Make an APM call using the 32bit protected mode interface. The
+ *     caller is responsible for knowing if APM BIOS is configured and
+ *     enabled. This call can disable interrupts for a long period of
+ *     time on some laptops.  The return value is in AH and the carry
+ *     flag is loaded into AL.  If there is an error, then the error
+ *     code is returned in AH (bits 8-15 of eax) and this function
+ *     returns non-zero.
+ */
+static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
+       u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
+{
+       APM_DECL_SEGS
+       unsigned long           flags;
+       cpumask_t               cpus;
+       int                     cpu;
+       struct desc_struct      save_desc_40;
+       struct desc_struct      *gdt;
+
+       cpus = apm_save_cpus();
+       
+       cpu = get_cpu();
+       gdt = get_cpu_gdt_table(cpu);
+       save_desc_40 = gdt[0x40 / 8];
+       gdt[0x40 / 8] = bad_bios_desc;
+
+       apm_irq_save(flags);
+       APM_DO_SAVE_SEGS;
+       apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi);
+       APM_DO_RESTORE_SEGS;
+       apm_irq_restore(flags);
+       gdt[0x40 / 8] = save_desc_40;
+       put_cpu();
+       apm_restore_cpus(cpus);
+       
+       return *eax & 0xff;
+}
+
+/**
+ *     apm_bios_call_simple    -       make a simple APM BIOS 32bit call
+ *     @func: APM function to invoke
+ *     @ebx_in: EBX register value for BIOS call
+ *     @ecx_in: ECX register value for BIOS call
+ *     @eax: EAX register on return from the BIOS call
+ *
+ *     Make a BIOS call that returns one value only, or just status.
+ *     If there is an error, then the error code is returned in AH
+ *     (bits 8-15 of eax) and this function returns non-zero. This is
+ *     used for simpler BIOS operations. This call may hold interrupts
+ *     off for a long time on some laptops.
+ */
+
+static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
+{
+       u8                      error;
+       APM_DECL_SEGS
+       unsigned long           flags;
+       cpumask_t               cpus;
+       int                     cpu;
+       struct desc_struct      save_desc_40;
+       struct desc_struct      *gdt;
+
+       cpus = apm_save_cpus();
+       
+       cpu = get_cpu();
+       gdt = get_cpu_gdt_table(cpu);
+       save_desc_40 = gdt[0x40 / 8];
+       gdt[0x40 / 8] = bad_bios_desc;
+
+       apm_irq_save(flags);
+       APM_DO_SAVE_SEGS;
+       error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax);
+       APM_DO_RESTORE_SEGS;
+       apm_irq_restore(flags);
+       gdt[0x40 / 8] = save_desc_40;
+       put_cpu();
+       apm_restore_cpus(cpus);
+       return error;
+}
+
+/**
+ *     apm_driver_version      -       APM driver version
+ *     @val:   loaded with the APM version on return
+ *
+ *     Retrieve the APM version supported by the BIOS. This is only
+ *     supported for APM 1.1 or higher. An error indicates APM 1.0 is
+ *     probably present.
+ *
+ *     On entry val should point to a value indicating the APM driver
+ *     version with the high byte being the major and the low byte the
+ *     minor number both in BCD
+ *
+ *     On return it will hold the BIOS revision supported in the
+ *     same format.
+ */
+
+static int apm_driver_version(u_short *val)
+{
+       u32     eax;
+
+       if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
+               return (eax >> 8) & 0xff;
+       *val = eax;
+       return APM_SUCCESS;
+}
+
+/**
+ *     apm_get_event   -       get an APM event from the BIOS
+ *     @event: pointer to the event
+ *     @info: point to the event information
+ *
+ *     The APM BIOS provides a polled information for event
+ *     reporting. The BIOS expects to be polled at least every second
+ *     when events are pending. When a message is found the caller should
+ *     poll until no more messages are present.  However, this causes
+ *     problems on some laptops where a suspend event notification is
+ *     not cleared until it is acknowledged.
+ *
+ *     Additional information is returned in the info pointer, providing
+ *     that APM 1.2 is in use. If no messges are pending the value 0x80
+ *     is returned (No power management events pending).
+ */
+static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
+{
+       u32     eax;
+       u32     ebx;
+       u32     ecx;
+       u32     dummy;
+
+       if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
+                       &dummy, &dummy))
+               return (eax >> 8) & 0xff;
+       *event = ebx;
+       if (apm_info.connection_version < 0x0102)
+               *info = ~0; /* indicate info not valid */
+       else
+               *info = ecx;
+       return APM_SUCCESS;
+}
+
+/**
+ *     set_power_state -       set the power management state
+ *     @what: which items to transition
+ *     @state: state to transition to
+ *
+ *     Request an APM change of state for one or more system devices. The
+ *     processor state must be transitioned last of all. what holds the
+ *     class of device in the upper byte and the device number (0xFF for
+ *     all) for the object to be transitioned.
+ *
+ *     The state holds the state to transition to, which may in fact
+ *     be an acceptance of a BIOS requested state change.
+ */
+static int set_power_state(u_short what, u_short state)
+{
+       u32     eax;
+
+       if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
+               return (eax >> 8) & 0xff;
+       return APM_SUCCESS;
+}
+
+/**
+ *     set_system_power_state - set system wide power state
+ *     @state: which state to enter
+ *
+ *     Transition the entire system into a new APM power state.
+ */
+static int set_system_power_state(u_short state)
+{
+       return set_power_state(APM_DEVICE_ALL, state);
+}
+
+/**
+ *     apm_do_idle     -       perform power saving
+ *
+ *     This function notifies the BIOS that the processor is (in the view
+ *     of the OS) idle. It returns -1 in the event that the BIOS refuses
+ *     to handle the idle request. On a success the function returns 1
+ *     if the BIOS did clock slowing or 0 otherwise.
+ */
+static int apm_do_idle(void)
+{
+       u32     eax;
+       u8      ret = 0;
+       int     idled = 0;
+       int     polling;
+
+       polling = !!(current_thread_info()->status & TS_POLLING);
+       if (polling) {
+               current_thread_info()->status &= ~TS_POLLING;
+               /*
+                * TS_POLLING-cleared state must be visible before we
+                * test NEED_RESCHED:
+                */
+               smp_mb();
+       }
+       if (!need_resched()) {
+               idled = 1;
+               ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax);
+       }
+       if (polling)
+               current_thread_info()->status |= TS_POLLING;
+
+       if (!idled)
+               return 0;
+
+       if (ret) {
+               static unsigned long t;
+
+               /* This always fails on some SMP boards running UP kernels.
+                * Only report the failure the first 5 times.
+                */
+               if (++t < 5)
+               {
+                       printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
+                                       (eax >> 8) & 0xff);
+                       t = jiffies;
+               }
+               return -1;
+       }
+       clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
+       return clock_slowed;
+}
+
+/**
+ *     apm_do_busy     -       inform the BIOS the CPU is busy
+ *
+ *     Request that the BIOS brings the CPU back to full performance. 
+ */
+static void apm_do_busy(void)
+{
+       u32     dummy;
+
+       if (clock_slowed || ALWAYS_CALL_BUSY) {
+               (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
+               clock_slowed = 0;
+       }
+}
+
+/*
+ * If no process has really been interested in
+ * the CPU for some time, we want to call BIOS
+ * power management - we probably want
+ * to conserve power.
+ */
+#define IDLE_CALC_LIMIT   (HZ * 100)
+#define IDLE_LEAKY_MAX    16
+
+static void (*original_pm_idle)(void) __read_mostly;
+
+/**
+ * apm_cpu_idle                -       cpu idling for APM capable Linux
+ *
+ * This is the idling function the kernel executes when APM is available. It 
+ * tries to do BIOS powermanagement based on the average system idle time.
+ * Furthermore it calls the system default idle routine.
+ */
+
+static void apm_cpu_idle(void)
+{
+       static int use_apm_idle; /* = 0 */
+       static unsigned int last_jiffies; /* = 0 */
+       static unsigned int last_stime; /* = 0 */
+
+       int apm_idle_done = 0;
+       unsigned int jiffies_since_last_check = jiffies - last_jiffies;
+       unsigned int bucket;
+
+recalc:
+       if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
+               use_apm_idle = 0;
+               last_jiffies = jiffies;
+               last_stime = current->stime;
+       } else if (jiffies_since_last_check > idle_period) {
+               unsigned int idle_percentage;
+
+               idle_percentage = current->stime - last_stime;
+               idle_percentage *= 100;
+               idle_percentage /= jiffies_since_last_check;
+               use_apm_idle = (idle_percentage > idle_threshold);
+               if (apm_info.forbid_idle)
+                       use_apm_idle = 0;
+               last_jiffies = jiffies;
+               last_stime = current->stime;
+       }
+
+       bucket = IDLE_LEAKY_MAX;
+
+       while (!need_resched()) {
+               if (use_apm_idle) {
+                       unsigned int t;
+
+                       t = jiffies;
+                       switch (apm_do_idle()) {
+                       case 0: apm_idle_done = 1;
+                               if (t != jiffies) {
+                                       if (bucket) {
+                                               bucket = IDLE_LEAKY_MAX;
+                                               continue;
+                                       }
+                               } else if (bucket) {
+                                       bucket--;
+                                       continue;
+                               }
+                               break;
+                       case 1: apm_idle_done = 1;
+                               break;
+                       default: /* BIOS refused */
+                               break;
+                       }
+               }
+               if (original_pm_idle)
+                       original_pm_idle();
+               else
+                       default_idle();
+               jiffies_since_last_check = jiffies - last_jiffies;
+               if (jiffies_since_last_check > idle_period)
+                       goto recalc;
+       }
+
+       if (apm_idle_done)
+               apm_do_busy();
+}
+
+/**
+ *     apm_power_off   -       ask the BIOS to power off
+ *
+ *     Handle the power off sequence. This is the one piece of code we
+ *     will execute even on SMP machines. In order to deal with BIOS
+ *     bugs we support real mode APM BIOS power off calls. We also make
+ *     the SMP call on CPU0 as some systems will only honour this call
+ *     on their first cpu.
+ */
+static void apm_power_off(void)
+{
+       unsigned char   po_bios_call[] = {
+               0xb8, 0x00, 0x10,       /* movw  $0x1000,ax  */
+               0x8e, 0xd0,             /* movw  ax,ss       */
+               0xbc, 0x00, 0xf0,       /* movw  $0xf000,sp  */
+               0xb8, 0x07, 0x53,       /* movw  $0x5307,ax  */
+               0xbb, 0x01, 0x00,       /* movw  $0x0001,bx  */
+               0xb9, 0x03, 0x00,       /* movw  $0x0003,cx  */
+               0xcd, 0x15              /* int   $0x15       */
+       };
+
+       /* Some bioses don't like being called from CPU != 0 */
+       if (apm_info.realmode_power_off)
+       {
+               (void)apm_save_cpus();
+               machine_real_restart(po_bios_call, sizeof(po_bios_call));
+       }
+       else
+               (void) set_system_power_state(APM_STATE_OFF);
+}
+
+#ifdef CONFIG_APM_DO_ENABLE
+
+/**
+ *     apm_enable_power_management - enable BIOS APM power management
+ *     @enable: enable yes/no
+ *
+ *     Enable or disable the APM BIOS power services. 
+ */
+static int apm_enable_power_management(int enable)
+{
+       u32     eax;
+
+       if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
+               return APM_NOT_ENGAGED;
+       if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
+                       enable, &eax))
+               return (eax >> 8) & 0xff;
+       if (enable)
+               apm_info.bios.flags &= ~APM_BIOS_DISABLED;
+       else
+               apm_info.bios.flags |= APM_BIOS_DISABLED;
+       return APM_SUCCESS;
+}
+#endif
+
+/**
+ *     apm_get_power_status    -       get current power state
+ *     @status: returned status
+ *     @bat: battery info
+ *     @life: estimated life
+ *
+ *     Obtain the current power status from the APM BIOS. We return a
+ *     status which gives the rough battery status, and current power
+ *     source. The bat value returned give an estimate as a percentage
+ *     of life and a status value for the battery. The estimated life
+ *     if reported is a lifetime in secodnds/minutes at current powwer
+ *     consumption.
+ */
+static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
+{
+       u32     eax;
+       u32     ebx;
+       u32     ecx;
+       u32     edx;
+       u32     dummy;
+
+       if (apm_info.get_power_status_broken)
+               return APM_32_UNSUPPORTED;
+       if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
+                       &eax, &ebx, &ecx, &edx, &dummy))
+               return (eax >> 8) & 0xff;
+       *status = ebx;
+       *bat = ecx;
+       if (apm_info.get_power_status_swabinminutes) {
+               *life = swab16((u16)edx);
+               *life |= 0x8000;
+       } else
+               *life = edx;
+       return APM_SUCCESS;
+}
+
+#if 0
+static int apm_get_battery_status(u_short which, u_short *status,
+                                 u_short *bat, u_short *life, u_short *nbat)
+{
+       u32     eax;
+       u32     ebx;
+       u32     ecx;
+       u32     edx;
+       u32     esi;
+
+       if (apm_info.connection_version < 0x0102) {
+               /* pretend we only have one battery. */
+               if (which != 1)
+                       return APM_BAD_DEVICE;
+               *nbat = 1;
+               return apm_get_power_status(status, bat, life);
+       }
+
+       if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
+                       &ebx, &ecx, &edx, &esi))
+               return (eax >> 8) & 0xff;
+       *status = ebx;
+       *bat = ecx;
+       *life = edx;
+       *nbat = esi;
+       return APM_SUCCESS;
+}
+#endif
+
+/**
+ *     apm_engage_power_management     -       enable PM on a device
+ *     @device: identity of device
+ *     @enable: on/off
+ *
+ *     Activate or deactive power management on either a specific device
+ *     or the entire system (%APM_DEVICE_ALL).
+ */
+static int apm_engage_power_management(u_short device, int enable)
+{
+       u32     eax;
+
+       if ((enable == 0) && (device == APM_DEVICE_ALL)
+           && (apm_info.bios.flags & APM_BIOS_DISABLED))
+               return APM_DISABLED;
+       if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
+               return (eax >> 8) & 0xff;
+       if (device == APM_DEVICE_ALL) {
+               if (enable)
+                       apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
+               else
+                       apm_info.bios.flags |= APM_BIOS_DISENGAGED;
+       }
+       return APM_SUCCESS;
+}
+
+#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
+
+/**
+ *     apm_console_blank       -       blank the display
+ *     @blank: on/off
+ *
+ *     Attempt to blank the console, firstly by blanking just video device
+ *     zero, and if that fails (some BIOSes don't support it) then it blanks
+ *     all video devices. Typically the BIOS will do laptop backlight and
+ *     monitor powerdown for us.
+ */
+static int apm_console_blank(int blank)
+{
+       int error = APM_NOT_ENGAGED; /* silence gcc */
+       int i;
+       u_short state;
+       static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
+
+       state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
+
+       for (i = 0; i < ARRAY_SIZE(dev); i++) {
+               error = set_power_state(dev[i], state);
+
+               if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
+                       return 1;
+
+               if (error == APM_NOT_ENGAGED)
+                       break;
+       }
+
+       if (error == APM_NOT_ENGAGED) {
+               static int tried;
+               int eng_error;
+               if (tried++ == 0) {
+                       eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1);
+                       if (eng_error) {
+                               apm_error("set display", error);
+                               apm_error("engage interface", eng_error);
+                               return 0;
+                       } else
+                               return apm_console_blank(blank);
+               }
+       }
+       apm_error("set display", error);
+       return 0;
+}
+#endif
+
+static int queue_empty(struct apm_user *as)
+{
+       return as->event_head == as->event_tail;
+}
+
+static apm_event_t get_queued_event(struct apm_user *as)
+{
+       if (++as->event_tail >= APM_MAX_EVENTS)
+               as->event_tail = 0;
+       return as->events[as->event_tail];
+}
+
+static void queue_event(apm_event_t event, struct apm_user *sender)
+{
+       struct apm_user *       as;
+
+       spin_lock(&user_list_lock);
+       if (user_list == NULL)
+               goto out;
+       for (as = user_list; as != NULL; as = as->next) {
+               if ((as == sender) || (!as->reader))
+                       continue;
+               if (++as->event_head >= APM_MAX_EVENTS)
+                       as->event_head = 0;
+
+               if (as->event_head == as->event_tail) {
+                       static int notified;
+
+                       if (notified++ == 0)
+                           printk(KERN_ERR "apm: an event queue overflowed\n");
+                       if (++as->event_tail >= APM_MAX_EVENTS)
+                               as->event_tail = 0;
+               }
+               as->events[as->event_head] = event;
+               if ((!as->suser) || (!as->writer))
+                       continue;
+               switch (event) {
+               case APM_SYS_SUSPEND:
+               case APM_USER_SUSPEND:
+                       as->suspends_pending++;
+                       suspends_pending++;
+                       break;
+
+               case APM_SYS_STANDBY:
+               case APM_USER_STANDBY:
+                       as->standbys_pending++;
+                       standbys_pending++;
+                       break;
+               }
+       }
+       wake_up_interruptible(&apm_waitqueue);
+out:
+       spin_unlock(&user_list_lock);
+}
+
+static void reinit_timer(void)
+{
+#ifdef INIT_TIMER_AFTER_SUSPEND
+       unsigned long flags;
+
+       spin_lock_irqsave(&i8253_lock, flags);
+       /* set the clock to HZ */
+       outb_p(0x34, PIT_MODE);         /* binary, mode 2, LSB/MSB, ch 0 */
+       udelay(10);
+       outb_p(LATCH & 0xff, PIT_CH0);  /* LSB */
+       udelay(10);
+       outb(LATCH >> 8, PIT_CH0);      /* MSB */
+       udelay(10);
+       spin_unlock_irqrestore(&i8253_lock, flags);
+#endif
+}
+
+static int suspend(int vetoable)
+{
+       int             err;
+       struct apm_user *as;
+
+       if (pm_send_all(PM_SUSPEND, (void *)3)) {
+               /* Vetoed */
+               if (vetoable) {
+                       if (apm_info.connection_version > 0x100)
+                               set_system_power_state(APM_STATE_REJECT);
+                       err = -EBUSY;
+                       ignore_sys_suspend = 0;
+                       printk(KERN_WARNING "apm: suspend was vetoed.\n");
+                       goto out;
+               }
+               printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
+       }
+
+       device_suspend(PMSG_SUSPEND);
+       local_irq_disable();
+       device_power_down(PMSG_SUSPEND);
+
+       local_irq_enable();
+
+       save_processor_state();
+       err = set_system_power_state(APM_STATE_SUSPEND);
+       ignore_normal_resume = 1;
+       restore_processor_state();
+
+       local_irq_disable();
+       reinit_timer();
+
+       if (err == APM_NO_ERROR)
+               err = APM_SUCCESS;
+       if (err != APM_SUCCESS)
+               apm_error("suspend", err);
+       err = (err == APM_SUCCESS) ? 0 : -EIO;
+       device_power_up();
+       local_irq_enable();
+       device_resume();
+       pm_send_all(PM_RESUME, (void *)0);
+       queue_event(APM_NORMAL_RESUME, NULL);
+ out:
+       spin_lock(&user_list_lock);
+       for (as = user_list; as != NULL; as = as->next) {
+               as->suspend_wait = 0;
+               as->suspend_result = err;
+       }
+       spin_unlock(&user_list_lock);
+       wake_up_interruptible(&apm_suspend_waitqueue);
+       return err;
+}
+
+static void standby(void)
+{
+       int     err;
+
+       local_irq_disable();
+       device_power_down(PMSG_SUSPEND);
+       local_irq_enable();
+
+       err = set_system_power_state(APM_STATE_STANDBY);
+       if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
+               apm_error("standby", err);
+
+       local_irq_disable();
+       device_power_up();
+       local_irq_enable();
+}
+
+static apm_event_t get_event(void)
+{
+       int             error;
+       apm_event_t     event = APM_NO_EVENTS; /* silence gcc */
+       apm_eventinfo_t info;
+
+       static int notified;
+
+       /* we don't use the eventinfo */
+       error = apm_get_event(&event, &info);
+       if (error == APM_SUCCESS)
+               return event;
+
+       if ((error != APM_NO_EVENTS) && (notified++ == 0))
+               apm_error("get_event", error);
+
+       return 0;
+}
+
+static void check_events(void)
+{
+       apm_event_t             event;
+       static unsigned long    last_resume;
+       static int              ignore_bounce;
+
+       while ((event = get_event()) != 0) {
+               if (debug) {
+                       if (event <= NR_APM_EVENT_NAME)
+                               printk(KERN_DEBUG "apm: received %s notify\n",
+                                      apm_event_name[event - 1]);
+                       else
+                               printk(KERN_DEBUG "apm: received unknown "
+                                      "event 0x%02x\n", event);
+               }
+               if (ignore_bounce
+                   && ((jiffies - last_resume) > bounce_interval))
+                       ignore_bounce = 0;
+
+               switch (event) {
+               case APM_SYS_STANDBY:
+               case APM_USER_STANDBY:
+                       queue_event(event, NULL);
+                       if (standbys_pending <= 0)
+                               standby();
+                       break;
+
+               case APM_USER_SUSPEND:
+#ifdef CONFIG_APM_IGNORE_USER_SUSPEND
+                       if (apm_info.connection_version > 0x100)
+                               set_system_power_state(APM_STATE_REJECT);
+                       break;
+#endif
+               case APM_SYS_SUSPEND:
+                       if (ignore_bounce) {
+                               if (apm_info.connection_version > 0x100)
+                                       set_system_power_state(APM_STATE_REJECT);
+                               break;
+                       }
+                       /*
+                        * If we are already processing a SUSPEND,
+                        * then further SUSPEND events from the BIOS
+                        * will be ignored.  We also return here to
+                        * cope with the fact that the Thinkpads keep
+                        * sending a SUSPEND event until something else
+                        * happens!
+                        */
+                       if (ignore_sys_suspend)
+                               return;
+                       ignore_sys_suspend = 1;
+                       queue_event(event, NULL);
+                       if (suspends_pending <= 0)
+                               (void) suspend(1);
+                       break;
+
+               case APM_NORMAL_RESUME:
+               case APM_CRITICAL_RESUME:
+               case APM_STANDBY_RESUME:
+                       ignore_sys_suspend = 0;
+                       last_resume = jiffies;
+                       ignore_bounce = 1;
+                       if ((event != APM_NORMAL_RESUME)
+                           || (ignore_normal_resume == 0)) {
+                               device_resume();
+                               pm_send_all(PM_RESUME, (void *)0);
+                               queue_event(event, NULL);
+                       }
+                       ignore_normal_resume = 0;
+                       break;
+
+               case APM_CAPABILITY_CHANGE:
+               case APM_LOW_BATTERY:
+               case APM_POWER_STATUS_CHANGE:
+                       queue_event(event, NULL);
+                       /* If needed, notify drivers here */
+                       break;
+
+               case APM_UPDATE_TIME:
+                       break;
+
+               case APM_CRITICAL_SUSPEND:
+                       /*
+                        * We are not allowed to reject a critical suspend.
+                        */
+                       (void) suspend(0);
+                       break;
+               }
+       }
+}
+
+static void apm_event_handler(void)
+{
+       static int      pending_count = 4;
+       int             err;
+
+       if ((standbys_pending > 0) || (suspends_pending > 0)) {
+               if ((apm_info.connection_version > 0x100) &&
+                               (pending_count-- <= 0)) {
+                       pending_count = 4;
+                       if (debug)
+                               printk(KERN_DEBUG "apm: setting state busy\n");
+                       err = set_system_power_state(APM_STATE_BUSY);
+                       if (err)
+                               apm_error("busy", err);
+               }
+       } else
+               pending_count = 4;
+       check_events();
+}
+
+/*
+ * This is the APM thread main loop.
+ */
+
+static void apm_mainloop(void)
+{
+       DECLARE_WAITQUEUE(wait, current);
+
+       add_wait_queue(&apm_waitqueue, &wait);
+       set_current_state(TASK_INTERRUPTIBLE);
+       for (;;) {
+               schedule_timeout(APM_CHECK_TIMEOUT);
+               if (kthread_should_stop())
+                       break;
+               /*
+                * Ok, check all events, check for idle (and mark us sleeping
+                * so as not to count towards the load average)..
+                */
+               set_current_state(TASK_INTERRUPTIBLE);
+               apm_event_handler();
+       }
+       remove_wait_queue(&apm_waitqueue, &wait);
+}
+
+static int check_apm_user(struct apm_user *as, const char *func)
+{
+       if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
+               printk(KERN_ERR "apm: %s passed bad filp\n", func);
+               return 1;
+       }
+       return 0;
+}
+
+static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
+{
+       struct apm_user *       as;
+       int                     i;
+       apm_event_t             event;
+
+       as = fp->private_data;
+       if (check_apm_user(as, "read"))
+               return -EIO;
+       if ((int)count < sizeof(apm_event_t))
+               return -EINVAL;
+       if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
+               return -EAGAIN;
+       wait_event_interruptible(apm_waitqueue, !queue_empty(as));
+       i = count;
+       while ((i >= sizeof(event)) && !queue_empty(as)) {
+               event = get_queued_event(as);
+               if (copy_to_user(buf, &event, sizeof(event))) {
+                       if (i < count)
+                               break;
+                       return -EFAULT;
+               }
+               switch (event) {
+               case APM_SYS_SUSPEND:
+               case APM_USER_SUSPEND:
+                       as->suspends_read++;
+                       break;
+
+               case APM_SYS_STANDBY:
+               case APM_USER_STANDBY:
+                       as->standbys_read++;
+                       break;
+               }
+               buf += sizeof(event);
+               i -= sizeof(event);
+       }
+       if (i < count)
+               return count - i;
+       if (signal_pending(current))
+               return -ERESTARTSYS;
+       return 0;
+}
+
+static unsigned int do_poll(struct file *fp, poll_table * wait)
+{
+       struct apm_user * as;
+
+       as = fp->private_data;
+       if (check_apm_user(as, "poll"))
+               return 0;
+       poll_wait(fp, &apm_waitqueue, wait);
+       if (!queue_empty(as))
+               return POLLIN | POLLRDNORM;
+       return 0;
+}
+
+static int do_ioctl(struct inode * inode, struct file *filp,
+                   u_int cmd, u_long arg)
+{
+       struct apm_user *       as;
+
+       as = filp->private_data;
+       if (check_apm_user(as, "ioctl"))
+               return -EIO;
+       if ((!as->suser) || (!as->writer))
+               return -EPERM;
+       switch (cmd) {
+       case APM_IOC_STANDBY:
+               if (as->standbys_read > 0) {
+                       as->standbys_read--;
+                       as->standbys_pending--;
+                       standbys_pending--;
+               } else
+                       queue_event(APM_USER_STANDBY, as);
+               if (standbys_pending <= 0)
+                       standby();
+               break;
+       case APM_IOC_SUSPEND:
+               if (as->suspends_read > 0) {
+                       as->suspends_read--;
+                       as->suspends_pending--;
+                       suspends_pending--;
+               } else
+                       queue_event(APM_USER_SUSPEND, as);
+               if (suspends_pending <= 0) {
+                       return suspend(1);
+               } else {
+                       as->suspend_wait = 1;
+                       wait_event_interruptible(apm_suspend_waitqueue,
+                                       as->suspend_wait == 0);
+                       return as->suspend_result;
+               }
+               break;
+       default:
+               return -EINVAL;
+       }
+       return 0;
+}
+
+static int do_release(struct inode * inode, struct file * filp)
+{
+       struct apm_user *       as;
+
+       as = filp->private_data;
+       if (check_apm_user(as, "release"))
+               return 0;
+       filp->private_data = NULL;
+       if (as->standbys_pending > 0) {
+               standbys_pending -= as->standbys_pending;
+               if (standbys_pending <= 0)
+                       standby();
+       }
+       if (as->suspends_pending > 0) {
+               suspends_pending -= as->suspends_pending;
+               if (suspends_pending <= 0)
+                       (void) suspend(1);
+       }
+       spin_lock(&user_list_lock);
+       if (user_list == as)
+               user_list = as->next;
+       else {
+               struct apm_user *       as1;
+
+               for (as1 = user_list;
+                    (as1 != NULL) && (as1->next != as);
+                    as1 = as1->next)
+                       ;
+               if (as1 == NULL)
+                       printk(KERN_ERR "apm: filp not in user list\n");
+               else
+                       as1->next = as->next;
+       }
+       spin_unlock(&user_list_lock);
+       kfree(as);
+       return 0;
+}
+
+static int do_open(struct inode * inode, struct file * filp)
+{
+       struct apm_user *       as;
+
+       as = kmalloc(sizeof(*as), GFP_KERNEL);
+       if (as == NULL) {
+               printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
+                      sizeof(*as));
+               return -ENOMEM;
+       }
+       as->magic = APM_BIOS_MAGIC;
+       as->event_tail = as->event_head = 0;
+       as->suspends_pending = as->standbys_pending = 0;
+       as->suspends_read = as->standbys_read = 0;
+       /*
+        * XXX - this is a tiny bit broken, when we consider BSD
+         * process accounting. If the device is opened by root, we
+        * instantly flag that we used superuser privs. Who knows,
+        * we might close the device immediately without doing a
+        * privileged operation -- cevans
+        */
+       as->suser = capable(CAP_SYS_ADMIN);
+       as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
+       as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
+       spin_lock(&user_list_lock);
+       as->next = user_list;
+       user_list = as;
+       spin_unlock(&user_list_lock);
+       filp->private_data = as;
+       return 0;
+}
+
+static int proc_apm_show(struct seq_file *m, void *v)
+{
+       unsigned short  bx;
+       unsigned short  cx;
+       unsigned short  dx;
+       int             error;
+       unsigned short  ac_line_status = 0xff;
+       unsigned short  battery_status = 0xff;
+       unsigned short  battery_flag   = 0xff;
+       int             percentage     = -1;
+       int             time_units     = -1;
+       char            *units         = "?";
+
+       if ((num_online_cpus() == 1) &&
+           !(error = apm_get_power_status(&bx, &cx, &dx))) {
+               ac_line_status = (bx >> 8) & 0xff;
+               battery_status = bx & 0xff;
+               if ((cx & 0xff) != 0xff)
+                       percentage = cx & 0xff;
+
+               if (apm_info.connection_version > 0x100) {
+                       battery_flag = (cx >> 8) & 0xff;
+                       if (dx != 0xffff) {
+                               units = (dx & 0x8000) ? "min" : "sec";
+                               time_units = dx & 0x7fff;
+                       }
+               }
+       }
+       /* Arguments, with symbols from linux/apm_bios.h.  Information is
+          from the Get Power Status (0x0a) call unless otherwise noted.
+
+          0) Linux driver version (this will change if format changes)
+          1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.
+          2) APM flags from APM Installation Check (0x00):
+             bit 0: APM_16_BIT_SUPPORT
+             bit 1: APM_32_BIT_SUPPORT
+             bit 2: APM_IDLE_SLOWS_CLOCK
+             bit 3: APM_BIOS_DISABLED
+             bit 4: APM_BIOS_DISENGAGED
+          3) AC line status
+             0x00: Off-line
+             0x01: On-line
+             0x02: On backup power (BIOS >= 1.1 only)
+             0xff: Unknown
+          4) Battery status
+             0x00: High
+             0x01: Low
+             0x02: Critical
+             0x03: Charging
+             0x04: Selected battery not present (BIOS >= 1.2 only)
+             0xff: Unknown
+          5) Battery flag
+             bit 0: High
+             bit 1: Low
+             bit 2: Critical
+             bit 3: Charging
+             bit 7: No system battery
+             0xff: Unknown
+          6) Remaining battery life (percentage of charge):
+             0-100: valid
+             -1: Unknown
+          7) Remaining battery life (time units):
+             Number of remaining minutes or seconds
+             -1: Unknown
+          8) min = minutes; sec = seconds */
+
+       seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
+                    driver_version,
+                    (apm_info.bios.version >> 8) & 0xff,
+                    apm_info.bios.version & 0xff,
+                    apm_info.bios.flags,
+                    ac_line_status,
+                    battery_status,
+                    battery_flag,
+                    percentage,
+                    time_units,
+                    units);
+       return 0;
+}
+
+static int proc_apm_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, proc_apm_show, NULL);
+}
+
+static const struct file_operations apm_file_ops = {
+       .owner          = THIS_MODULE,
+       .open           = proc_apm_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
+static int apm(void *unused)
+{
+       unsigned short  bx;
+       unsigned short  cx;
+       unsigned short  dx;
+       int             error;
+       char *          power_stat;
+       char *          bat_stat;
+
+#ifdef CONFIG_SMP
+       /* 2002/08/01 - WT
+        * This is to avoid random crashes at boot time during initialization
+        * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
+        * Some bioses don't like being called from CPU != 0.
+        * Method suggested by Ingo Molnar.
+        */
+       set_cpus_allowed(current, cpumask_of_cpu(0));
+       BUG_ON(smp_processor_id() != 0);
+#endif
+
+       if (apm_info.connection_version == 0) {
+               apm_info.connection_version = apm_info.bios.version;
+               if (apm_info.connection_version > 0x100) {
+                       /*
+                        * We only support BIOSs up to version 1.2
+                        */
+                       if (apm_info.connection_version > 0x0102)
+                               apm_info.connection_version = 0x0102;
+                       error = apm_driver_version(&apm_info.connection_version);
+                       if (error != APM_SUCCESS) {
+                               apm_error("driver version", error);
+                               /* Fall back to an APM 1.0 connection. */
+                               apm_info.connection_version = 0x100;
+                       }
+               }
+       }
+
+       if (debug)
+               printk(KERN_INFO "apm: Connection version %d.%d\n",
+                       (apm_info.connection_version >> 8) & 0xff,
+                       apm_info.connection_version & 0xff);
+
+#ifdef CONFIG_APM_DO_ENABLE
+       if (apm_info.bios.flags & APM_BIOS_DISABLED) {
+               /*
+                * This call causes my NEC UltraLite Versa 33/C to hang if it
+                * is booted with PM disabled but not in the docking station.
+                * Unfortunate ...
+                */
+               error = apm_enable_power_management(1);
+               if (error) {
+                       apm_error("enable power management", error);
+                       return -1;
+               }
+       }
+#endif
+
+       if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
+           && (apm_info.connection_version > 0x0100)) {
+               error = apm_engage_power_management(APM_DEVICE_ALL, 1);
+               if (error) {
+                       apm_error("engage power management", error);
+                       return -1;
+               }
+       }
+
+       if (debug && (num_online_cpus() == 1 || smp )) {
+               error = apm_get_power_status(&bx, &cx, &dx);
+               if (error)
+                       printk(KERN_INFO "apm: power status not available\n");
+               else {
+                       switch ((bx >> 8) & 0xff) {
+                       case 0: power_stat = "off line"; break;
+                       case 1: power_stat = "on line"; break;
+                       case 2: power_stat = "on backup power"; break;
+                       default: power_stat = "unknown"; break;
+                       }
+                       switch (bx & 0xff) {
+                       case 0: bat_stat = "high"; break;
+                       case 1: bat_stat = "low"; break;
+                       case 2: bat_stat = "critical"; break;
+                       case 3: bat_stat = "charging"; break;
+                       default: bat_stat = "unknown"; break;
+                       }
+                       printk(KERN_INFO
+                              "apm: AC %s, battery status %s, battery life ",
+                              power_stat, bat_stat);
+                       if ((cx & 0xff) == 0xff)
+                               printk("unknown\n");
+                       else
+                               printk("%d%%\n", cx & 0xff);
+                       if (apm_info.connection_version > 0x100) {
+                               printk(KERN_INFO
+                                      "apm: battery flag 0x%02x, battery life ",
+                                      (cx >> 8) & 0xff);
+                               if (dx == 0xffff)
+                                       printk("unknown\n");
+                               else
+                                       printk("%d %s\n", dx & 0x7fff,
+                                               (dx & 0x8000) ?
+                                               "minutes" : "seconds");
+                       }
+               }
+       }
+
+       /* Install our power off handler.. */
+       if (power_off)
+               pm_power_off = apm_power_off;
+
+       if (num_online_cpus() == 1 || smp) {
+#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
+               console_blank_hook = apm_console_blank;
+#endif
+               apm_mainloop();
+#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
+               console_blank_hook = NULL;
+#endif
+       }
+
+       return 0;
+}
+
+#ifndef MODULE
+static int __init apm_setup(char *str)
+{
+       int     invert;
+
+       while ((str != NULL) && (*str != '\0')) {
+               if (strncmp(str, "off", 3) == 0)
+                       apm_disabled = 1;
+               if (strncmp(str, "on", 2) == 0)
+                       apm_disabled = 0;
+               if ((strncmp(str, "bounce-interval=", 16) == 0) ||
+                   (strncmp(str, "bounce_interval=", 16) == 0))
+                       bounce_interval = simple_strtol(str + 16, NULL, 0);
+               if ((strncmp(str, "idle-threshold=", 15) == 0) ||
+                   (strncmp(str, "idle_threshold=", 15) == 0))
+                       idle_threshold = simple_strtol(str + 15, NULL, 0);
+               if ((strncmp(str, "idle-period=", 12) == 0) ||
+                   (strncmp(str, "idle_period=", 12) == 0))
+                       idle_period = simple_strtol(str + 12, NULL, 0);
+               invert = (strncmp(str, "no-", 3) == 0) ||
+                       (strncmp(str, "no_", 3) == 0);
+               if (invert)
+                       str += 3;
+               if (strncmp(str, "debug", 5) == 0)
+                       debug = !invert;
+               if ((strncmp(str, "power-off", 9) == 0) ||
+                   (strncmp(str, "power_off", 9) == 0))
+                       power_off = !invert;
+               if (strncmp(str, "smp", 3) == 0)
+               {
+                       smp = !invert;
+                       idle_threshold = 100;
+               }
+               if ((strncmp(str, "allow-ints", 10) == 0) ||
+                   (strncmp(str, "allow_ints", 10) == 0))
+                       apm_info.allow_ints = !invert;
+               if ((strncmp(str, "broken-psr", 10) == 0) ||
+                   (strncmp(str, "broken_psr", 10) == 0))
+                       apm_info.get_power_status_broken = !invert;
+               if ((strncmp(str, "realmode-power-off", 18) == 0) ||
+                   (strncmp(str, "realmode_power_off", 18) == 0))
+                       apm_info.realmode_power_off = !invert;
+               str = strchr(str, ',');
+               if (str != NULL)
+                       str += strspn(str, ", \t");
+       }
+       return 1;
+}
+
+__setup("apm=", apm_setup);
+#endif
+
+static const struct file_operations apm_bios_fops = {
+       .owner          = THIS_MODULE,
+       .read           = do_read,
+       .poll           = do_poll,
+       .ioctl          = do_ioctl,
+       .open           = do_open,
+       .release        = do_release,
+};
+
+static struct miscdevice apm_device = {
+       APM_MINOR_DEV,
+       "apm_bios",
+       &apm_bios_fops
+};
+
+
+/* Simple "print if true" callback */
+static int __init print_if_true(struct dmi_system_id *d)
+{
+       printk("%s\n", d->ident);
+       return 0;
+}
+
+/*
+ * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was
+ * disabled before the suspend. Linux used to get terribly confused by that.
+ */
+static int __init broken_ps2_resume(struct dmi_system_id *d)
+{
+       printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident);
+       return 0;
+}
+
+/* Some bioses have a broken protected mode poweroff and need to use realmode */
+static int __init set_realmode_power_off(struct dmi_system_id *d)
+{
+       if (apm_info.realmode_power_off == 0) {
+               apm_info.realmode_power_off = 1;
+               printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
+       }
+       return 0;
+}
+
+/* Some laptops require interrupts to be enabled during APM calls */
+static int __init set_apm_ints(struct dmi_system_id *d)
+{
+       if (apm_info.allow_ints == 0) {
+               apm_info.allow_ints = 1;
+               printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
+       }
+       return 0;
+}
+
+/* Some APM bioses corrupt memory or just plain do not work */
+static int __init apm_is_horked(struct dmi_system_id *d)
+{
+       if (apm_info.disabled == 0) {
+               apm_info.disabled = 1;
+               printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
+       }
+       return 0;
+}
+
+static int __init apm_is_horked_d850md(struct dmi_system_id *d)
+{
+       if (apm_info.disabled == 0) {
+               apm_info.disabled = 1;
+               printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
+               printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
+               printk(KERN_INFO "download from support.intel.com \n");
+       }
+       return 0;
+}
+
+/* Some APM bioses hang on APM idle calls */
+static int __init apm_likes_to_melt(struct dmi_system_id *d)
+{
+       if (apm_info.forbid_idle == 0) {
+               apm_info.forbid_idle = 1;
+               printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
+       }
+       return 0;
+}
+
+/*
+ *  Check for clue free BIOS implementations who use
+ *  the following QA technique
+ *
+ *      [ Write BIOS Code ]<------
+ *               |                ^
+ *      < Does it Compile >----N--
+ *               |Y               ^
+ *     < Does it Boot Win98 >-N--
+ *               |Y
+ *           [Ship It]
+ *
+ *     Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
+ *     Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
+ */
+static int __init broken_apm_power(struct dmi_system_id *d)
+{
+       apm_info.get_power_status_broken = 1;
+       printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
+       return 0;
+}
+
+/*
+ * This bios swaps the APM minute reporting bytes over (Many sony laptops
+ * have this problem).
+ */
+static int __init swab_apm_power_in_minutes(struct dmi_system_id *d)
+{
+       apm_info.get_power_status_swabinminutes = 1;
+       printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
+       return 0;
+}
+
+static struct dmi_system_id __initdata apm_dmi_table[] = {
+       {
+               print_if_true,
+               KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), },
+       },
+       {       /* Handle problems with APM on the C600 */
+               broken_ps2_resume, "Dell Latitude C600",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), },
+       },
+       {       /* Allow interrupts during suspend on Dell Latitude laptops*/
+               set_apm_ints, "Dell Latitude",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), }
+       },
+       {       /* APM crashes */
+               apm_is_horked, "Dell Inspiron 2500",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
+                       DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
+       },
+       {       /* Allow interrupts during suspend on Dell Inspiron laptops*/
+               set_apm_ints, "Dell Inspiron", {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), },
+       },
+       {       /* Handle problems with APM on Inspiron 5000e */
+               broken_apm_power, "Dell Inspiron 5000e",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "A04"),
+                       DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), },
+       },
+       {       /* Handle problems with APM on Inspiron 2500 */
+               broken_apm_power, "Dell Inspiron 2500",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "A12"),
+                       DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), },
+       },
+       {       /* APM crashes */
+               apm_is_horked, "Dell Dimension 4100",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"),
+                       DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."),
+                       DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
+       },
+       {       /* Allow interrupts during suspend on Compaq Laptops*/
+               set_apm_ints, "Compaq 12XL125",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"),
+                       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION,"4.06"), },
+       },
+       {       /* Allow interrupts during APM or the clock goes slow */
+               set_apm_ints, "ASUSTeK",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), },
+       },
+       {       /* APM blows on shutdown */
+               apm_is_horked, "ABIT KX7-333[R]",
+               {       DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"),
+                       DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), },
+       },
+       {       /* APM crashes */
+               apm_is_horked, "Trigem Delhi3",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), },
+       },
+       {       /* APM crashes */
+               apm_is_horked, "Fujitsu-Siemens",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), },
+       },
+       {       /* APM crashes */
+               apm_is_horked_d850md, "Intel D850MD",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
+                       DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), },
+       },
+       {       /* APM crashes */
+               apm_is_horked, "Intel D810EMO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
+                       DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), },
+       },
+       {       /* APM crashes */
+               apm_is_horked, "Dell XPS-Z",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."),
+                       DMI_MATCH(DMI_BIOS_VERSION, "A11"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), },
+       },
+       {       /* APM crashes */
+               apm_is_horked, "Sharp PC-PJ/AX",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "SHARP"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"),
+                       DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"),
+                       DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), },
+       },
+       {       /* APM crashes */
+               apm_is_horked, "Dell Inspiron 2500",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"),
+                       DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION,"A11"), },
+       },
+       {       /* APM idle hangs */
+               apm_likes_to_melt, "Jabil AMD",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
+                       DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
+       },
+       {       /* APM idle hangs */
+               apm_likes_to_melt, "AMI Bios",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
+                       DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0206H"),
+                       DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-N505VX */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"),
+                       DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-XG29 */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"),
+                       DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-Z600NE */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"),
+                       DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-Z600NE */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"),
+                       DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"),
+                       DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-Z505LS */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"),
+                       DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-Z505LS */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"),
+                       DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"),
+                       DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-F104K */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"),
+                       DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), },
+       },
+
+       {       /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"),
+                       DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-C1VE */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"),
+                       DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), },
+       },
+       {       /* Handle problems with APM on Sony Vaio PCG-C1VE */
+               swab_apm_power_in_minutes, "Sony VAIO",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+                       DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"),
+                       DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), },
+       },
+       {       /* broken PM poweroff bios */
+               set_realmode_power_off, "Award Software v4.60 PGMA",
+               {       DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."),
+                       DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
+                       DMI_MATCH(DMI_BIOS_DATE, "134526184"), },
+       },
+
+       /* Generic per vendor APM settings  */
+
+       {       /* Allow interrupts during suspend on IBM laptops */
+               set_apm_ints, "IBM",
+               {       DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
+       },
+
+       { }
+};
+
+/*
+ * Just start the APM thread. We do NOT want to do APM BIOS
+ * calls from anything but the APM thread, if for no other reason
+ * than the fact that we don't trust the APM BIOS. This way,
+ * most common APM BIOS problems that lead to protection errors
+ * etc will have at least some level of being contained...
+ *
+ * In short, if something bad happens, at least we have a choice
+ * of just killing the apm thread..
+ */
+static int __init apm_init(void)
+{
+       struct proc_dir_entry *apm_proc;
+       struct desc_struct *gdt;
+       int err;
+
+       dmi_check_system(apm_dmi_table);
+
+       if (apm_info.bios.version == 0 || paravirt_enabled()) {
+               printk(KERN_INFO "apm: BIOS not found.\n");
+               return -ENODEV;
+       }
+       printk(KERN_INFO
+               "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
+               ((apm_info.bios.version >> 8) & 0xff),
+               (apm_info.bios.version & 0xff),
+               apm_info.bios.flags,
+               driver_version);
+       if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
+               printk(KERN_INFO "apm: no 32 bit BIOS support\n");
+               return -ENODEV;
+       }
+
+       if (allow_ints)
+               apm_info.allow_ints = 1;
+       if (broken_psr)
+               apm_info.get_power_status_broken = 1;
+       if (realmode_power_off)
+               apm_info.realmode_power_off = 1;
+       /* User can override, but default is to trust DMI */
+       if (apm_disabled != -1)
+               apm_info.disabled = apm_disabled;
+
+       /*
+        * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
+        * but is reportedly a 1.0 BIOS.
+        */
+       if (apm_info.bios.version == 0x001)
+               apm_info.bios.version = 0x100;
+
+       /* BIOS < 1.2 doesn't set cseg_16_len */
+       if (apm_info.bios.version < 0x102)
+               apm_info.bios.cseg_16_len = 0; /* 64k */
+
+       if (debug) {
+               printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x",
+                       apm_info.bios.cseg, apm_info.bios.offset,
+                       apm_info.bios.cseg_16, apm_info.bios.dseg);
+               if (apm_info.bios.version > 0x100)
+                       printk(" cseg len %x, dseg len %x",
+                               apm_info.bios.cseg_len,
+                               apm_info.bios.dseg_len);
+               if (apm_info.bios.version > 0x101)
+                       printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
+               printk("\n");
+       }
+
+       if (apm_info.disabled) {
+               printk(KERN_NOTICE "apm: disabled on user request.\n");
+               return -ENODEV;
+       }
+       if ((num_online_cpus() > 1) && !power_off && !smp) {
+               printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
+               apm_info.disabled = 1;
+               return -ENODEV;
+       }
+       if (PM_IS_ACTIVE()) {
+               printk(KERN_NOTICE "apm: overridden by ACPI.\n");
+               apm_info.disabled = 1;
+               return -ENODEV;
+       }
+#ifdef CONFIG_PM_LEGACY
+       pm_active = 1;
+#endif
+
+       /*
+        * Set up a segment that references the real mode segment 0x40
+        * that extends up to the end of page zero (that we have reserved).
+        * This is for buggy BIOS's that refer to (real mode) segment 0x40
+        * even though they are called in protected mode.
+        */
+       set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
+       _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
+
+       /*
+        * Set up the long jump entry point to the APM BIOS, which is called
+        * from inline assembly.
+        */
+       apm_bios_entry.offset = apm_info.bios.offset;
+       apm_bios_entry.segment = APM_CS;
+
+       /*
+        * The APM 1.1 BIOS is supposed to provide limit information that it
+        * recognizes.  Many machines do this correctly, but many others do
+        * not restrict themselves to their claimed limit.  When this happens,
+        * they will cause a segmentation violation in the kernel at boot time.
+        * Most BIOS's, however, will respect a 64k limit, so we use that.
+        *
+        * Note we only set APM segments on CPU zero, since we pin the APM
+        * code to that CPU.
+        */
+       gdt = get_cpu_gdt_table(0);
+       set_base(gdt[APM_CS >> 3],
+                __va((unsigned long)apm_info.bios.cseg << 4));
+       set_base(gdt[APM_CS_16 >> 3],
+                __va((unsigned long)apm_info.bios.cseg_16 << 4));
+       set_base(gdt[APM_DS >> 3],
+                __va((unsigned long)apm_info.bios.dseg << 4));
+
+       apm_proc = create_proc_entry("apm", 0, NULL);
+       if (apm_proc)
+               apm_proc->proc_fops = &apm_file_ops;
+
+       kapmd_task = kthread_create(apm, NULL, "kapmd");
+       if (IS_ERR(kapmd_task)) {
+               printk(KERN_ERR "apm: disabled - Unable to start kernel "
+                               "thread.\n");
+               err = PTR_ERR(kapmd_task);
+               kapmd_task = NULL;
+               remove_proc_entry("apm", NULL);
+               return err;
+       }
+       wake_up_process(kapmd_task);
+
+       if (num_online_cpus() > 1 && !smp ) {
+               printk(KERN_NOTICE
+                  "apm: disabled - APM is not SMP safe (power off active).\n");
+               return 0;
+       }
+
+       /*
+        * Note we don't actually care if the misc_device cannot be registered.
+        * this driver can do its job without it, even if userspace can't
+        * control it.  just log the error
+        */
+       if (misc_register(&apm_device))
+               printk(KERN_WARNING "apm: Could not register misc device.\n");
+
+       if (HZ != 100)
+               idle_period = (idle_period * HZ) / 100;
+       if (idle_threshold < 100) {
+               original_pm_idle = pm_idle;
+               pm_idle  = apm_cpu_idle;
+               set_pm_idle = 1;
+       }
+
+       return 0;
+}
+
+static void __exit apm_exit(void)
+{
+       int     error;
+
+       if (set_pm_idle) {
+               pm_idle = original_pm_idle;
+               /*
+                * We are about to unload the current idle thread pm callback
+                * (pm_idle), Wait for all processors to update cached/local
+                * copies of pm_idle before proceeding.
+                */
+               cpu_idle_wait();
+       }
+       if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
+           && (apm_info.connection_version > 0x0100)) {
+               error = apm_engage_power_management(APM_DEVICE_ALL, 0);
+               if (error)
+                       apm_error("disengage power management", error);
+       }
+       misc_deregister(&apm_device);
+       remove_proc_entry("apm", NULL);
+       if (power_off)
+               pm_power_off = NULL;
+       if (kapmd_task) {
+               kthread_stop(kapmd_task);
+               kapmd_task = NULL;
+       }
+#ifdef CONFIG_PM_LEGACY
+       pm_active = 0;
+#endif
+}
+
+module_init(apm_init);
+module_exit(apm_exit);
+
+MODULE_AUTHOR("Stephen Rothwell");
+MODULE_DESCRIPTION("Advanced Power Management");
+MODULE_LICENSE("GPL");
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Enable debug mode");
+module_param(power_off, bool, 0444);
+MODULE_PARM_DESC(power_off, "Enable power off");
+module_param(bounce_interval, int, 0444);
+MODULE_PARM_DESC(bounce_interval,
+               "Set the number of ticks to ignore suspend bounces");
+module_param(allow_ints, bool, 0444);
+MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
+module_param(broken_psr, bool, 0444);
+MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
+module_param(realmode_power_off, bool, 0444);
+MODULE_PARM_DESC(realmode_power_off,
+               "Switch to real mode before powering off");
+module_param(idle_threshold, int, 0444);
+MODULE_PARM_DESC(idle_threshold,
+       "System idle percentage above which to make APM BIOS idle calls");
+module_param(idle_period, int, 0444);
+MODULE_PARM_DESC(idle_period,
+       "Period (in sec/100) over which to caculate the idle percentage");
+module_param(smp, bool, 0444);
+MODULE_PARM_DESC(smp,
+       "Set this to enable APM use on an SMP platform. Use with caution on older systems");
+MODULE_ALIAS_MISCDEV(APM_MINOR_DEV);