Most people will say N.
-config W83697HF_WDT
- tristate "W83697HF/W83697HG Watchdog Timer"
- depends on X86
- ---help---
- This is the driver for the hardware watchdog on the W83697HF/HG
- chipset as used in Dedibox/VIA motherboards (and likely others).
- This watchdog simply watches your kernel to make sure it doesn't
- freeze, and if it does, it reboots your computer after a certain
- amount of time.
-
- To compile this driver as a module, choose M here: the
- module will be called w83697hf_wdt.
-
- Most people will say N.
-
-config W83697UG_WDT
- tristate "W83697UG/W83697UF Watchdog Timer"
- depends on X86
- ---help---
- This is the driver for the hardware watchdog on the W83697UG/UF
- chipset as used in MSI Fuzzy CX700 VIA motherboards (and likely others).
- This watchdog simply watches your kernel to make sure it doesn't
- freeze, and if it does, it reboots your computer after a certain
- amount of time.
-
- To compile this driver as a module, choose M here: the
- module will be called w83697ug_wdt.
-
- Most people will say N.
-
config W83877F_WDT
tristate "W83877F (EMACS) Watchdog Timer"
depends on X86
obj-$(CONFIG_SMSC37B787_WDT) += smsc37b787_wdt.o
obj-$(CONFIG_VIA_WDT) += via_wdt.o
obj-$(CONFIG_W83627HF_WDT) += w83627hf_wdt.o
-obj-$(CONFIG_W83697HF_WDT) += w83697hf_wdt.o
-obj-$(CONFIG_W83697UG_WDT) += w83697ug_wdt.o
obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o
obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o
obj-$(CONFIG_MACHZ_WDT) += machzwd.o
+++ /dev/null
-/*
- * w83697hf/hg WDT driver
- *
- * (c) Copyright 2006 Samuel Tardieu <sam@rfc1149.net>
- * (c) Copyright 2006 Marcus Junker <junker@anduras.de>
- *
- * Based on w83627hf_wdt.c which is based on advantechwdt.c
- * which is based on wdt.c.
- * Original copyright messages:
- *
- * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
- *
- * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
- *
- * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
- * All Rights Reserved.
- *
- * 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 of the License, or (at your option) any later version.
- *
- * Neither Marcus Junker nor ANDURAS AG admit liability nor provide
- * warranty for any of this software. This material is provided
- * "AS-IS" and at no charge.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/fs.h>
-#include <linux/ioport.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/io.h>
-#include <linux/uaccess.h>
-
-
-#define WATCHDOG_NAME "w83697hf/hg WDT"
-#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
-#define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */
-
-static unsigned long wdt_is_open;
-static char expect_close;
-static DEFINE_SPINLOCK(io_lock);
-
-/* You must set this - there is no sane way to probe for this board. */
-static int wdt_io = 0x2e;
-module_param(wdt_io, int, 0);
-MODULE_PARM_DESC(wdt_io,
- "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");
-
-static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout,
- "Watchdog timeout in seconds. 1<= timeout <=255 (default="
- __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
-
-static bool nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, bool, 0);
-MODULE_PARM_DESC(nowayout,
- "Watchdog cannot be stopped once started (default="
- __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-
-static int early_disable = WATCHDOG_EARLY_DISABLE;
-module_param(early_disable, int, 0);
-MODULE_PARM_DESC(early_disable,
- "Watchdog gets disabled at boot time (default="
- __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");
-
-/*
- * Kernel methods.
- */
-
-#define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */
-#define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register
- (same as EFER) */
-#define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */
-
-static inline void w83697hf_unlock(void)
-{
- outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */
- outb_p(0x87, W83697HF_EFER); /* Again according to manual */
-}
-
-static inline void w83697hf_lock(void)
-{
- outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */
-}
-
-/*
- * The three functions w83697hf_get_reg(), w83697hf_set_reg() and
- * w83697hf_write_timeout() must be called with the device unlocked.
- */
-
-static unsigned char w83697hf_get_reg(unsigned char reg)
-{
- outb_p(reg, W83697HF_EFIR);
- return inb_p(W83697HF_EFDR);
-}
-
-static void w83697hf_set_reg(unsigned char reg, unsigned char data)
-{
- outb_p(reg, W83697HF_EFIR);
- outb_p(data, W83697HF_EFDR);
-}
-
-static void w83697hf_write_timeout(int timeout)
-{
- /* Write Timeout counter to CRF4 */
- w83697hf_set_reg(0xF4, timeout);
-}
-
-static void w83697hf_select_wdt(void)
-{
- w83697hf_unlock();
- w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */
-}
-
-static inline void w83697hf_deselect_wdt(void)
-{
- w83697hf_lock();
-}
-
-static void w83697hf_init(void)
-{
- unsigned char bbuf;
-
- w83697hf_select_wdt();
-
- bbuf = w83697hf_get_reg(0x29);
- bbuf &= ~0x60;
- bbuf |= 0x20;
-
- /* Set pin 119 to WDTO# mode (= CR29, WDT0) */
- w83697hf_set_reg(0x29, bbuf);
-
- bbuf = w83697hf_get_reg(0xF3);
- bbuf &= ~0x04;
- w83697hf_set_reg(0xF3, bbuf); /* Count mode is seconds */
-
- w83697hf_deselect_wdt();
-}
-
-static void wdt_ping(void)
-{
- spin_lock(&io_lock);
- w83697hf_select_wdt();
-
- w83697hf_write_timeout(timeout);
-
- w83697hf_deselect_wdt();
- spin_unlock(&io_lock);
-}
-
-static void wdt_enable(void)
-{
- spin_lock(&io_lock);
- w83697hf_select_wdt();
-
- w83697hf_write_timeout(timeout);
- w83697hf_set_reg(0x30, 1); /* Enable timer */
-
- w83697hf_deselect_wdt();
- spin_unlock(&io_lock);
-}
-
-static void wdt_disable(void)
-{
- spin_lock(&io_lock);
- w83697hf_select_wdt();
-
- w83697hf_set_reg(0x30, 0); /* Disable timer */
- w83697hf_write_timeout(0);
-
- w83697hf_deselect_wdt();
- spin_unlock(&io_lock);
-}
-
-static unsigned char wdt_running(void)
-{
- unsigned char t;
-
- spin_lock(&io_lock);
- w83697hf_select_wdt();
-
- t = w83697hf_get_reg(0xF4); /* Read timer */
-
- w83697hf_deselect_wdt();
- spin_unlock(&io_lock);
-
- return t;
-}
-
-static int wdt_set_heartbeat(int t)
-{
- if (t < 1 || t > 255)
- return -EINVAL;
-
- timeout = t;
- return 0;
-}
-
-static ssize_t wdt_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- if (count) {
- if (!nowayout) {
- size_t i;
-
- expect_close = 0;
-
- for (i = 0; i != count; i++) {
- char c;
- if (get_user(c, buf + i))
- return -EFAULT;
- if (c == 'V')
- expect_close = 42;
- }
- }
- wdt_ping();
- }
- return count;
-}
-
-static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- int new_timeout;
- static const struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
- | WDIOF_MAGICCLOSE,
- .firmware_version = 1,
- .identity = "W83697HF WDT",
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- if (copy_to_user(argp, &ident, sizeof(ident)))
- return -EFAULT;
- break;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_SETOPTIONS:
- {
- int options, retval = -EINVAL;
-
- if (get_user(options, p))
- return -EFAULT;
-
- if (options & WDIOS_DISABLECARD) {
- wdt_disable();
- retval = 0;
- }
-
- if (options & WDIOS_ENABLECARD) {
- wdt_enable();
- retval = 0;
- }
-
- return retval;
- }
-
- case WDIOC_KEEPALIVE:
- wdt_ping();
- break;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_timeout, p))
- return -EFAULT;
- if (wdt_set_heartbeat(new_timeout))
- return -EINVAL;
- wdt_ping();
- /* Fall */
-
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
-
- default:
- return -ENOTTY;
- }
- return 0;
-}
-
-static int wdt_open(struct inode *inode, struct file *file)
-{
- if (test_and_set_bit(0, &wdt_is_open))
- return -EBUSY;
- /*
- * Activate
- */
-
- wdt_enable();
- return nonseekable_open(inode, file);
-}
-
-static int wdt_close(struct inode *inode, struct file *file)
-{
- if (expect_close == 42)
- wdt_disable();
- else {
- pr_crit("Unexpected close, not stopping watchdog!\n");
- wdt_ping();
- }
- expect_close = 0;
- clear_bit(0, &wdt_is_open);
- return 0;
-}
-
-/*
- * Notifier for system down
- */
-
-static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
- void *unused)
-{
- if (code == SYS_DOWN || code == SYS_HALT)
- wdt_disable(); /* Turn the WDT off */
-
- return NOTIFY_DONE;
-}
-
-/*
- * Kernel Interfaces
- */
-
-static const struct file_operations wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = wdt_write,
- .unlocked_ioctl = wdt_ioctl,
- .open = wdt_open,
- .release = wdt_close,
-};
-
-static struct miscdevice wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &wdt_fops,
-};
-
-/*
- * The WDT needs to learn about soft shutdowns in order to
- * turn the timebomb registers off.
- */
-
-static struct notifier_block wdt_notifier = {
- .notifier_call = wdt_notify_sys,
-};
-
-static int w83697hf_check_wdt(void)
-{
- if (!request_region(wdt_io, 2, WATCHDOG_NAME)) {
- pr_err("I/O address 0x%x already in use\n", wdt_io);
- return -EIO;
- }
-
- pr_debug("Looking for watchdog at address 0x%x\n", wdt_io);
- w83697hf_unlock();
- if (w83697hf_get_reg(0x20) == 0x60) {
- pr_info("watchdog found at address 0x%x\n", wdt_io);
- w83697hf_lock();
- return 0;
- }
- /* Reprotect in case it was a compatible device */
- w83697hf_lock();
-
- pr_info("watchdog not found at address 0x%x\n", wdt_io);
- release_region(wdt_io, 2);
- return -EIO;
-}
-
-static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 };
-
-static int __init wdt_init(void)
-{
- int ret, i, found = 0;
-
- pr_info("WDT driver for W83697HF/HG initializing\n");
-
- if (wdt_io == 0) {
- /* we will autodetect the W83697HF/HG watchdog */
- for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) {
- wdt_io = w83697hf_ioports[i];
- if (!w83697hf_check_wdt())
- found++;
- }
- } else {
- if (!w83697hf_check_wdt())
- found++;
- }
-
- if (!found) {
- pr_err("No W83697HF/HG could be found\n");
- ret = -ENODEV;
- goto out;
- }
-
- w83697hf_init();
- if (early_disable) {
- if (wdt_running())
- pr_warn("Stopping previously enabled watchdog until userland kicks in\n");
- wdt_disable();
- }
-
- if (wdt_set_heartbeat(timeout)) {
- wdt_set_heartbeat(WATCHDOG_TIMEOUT);
- pr_info("timeout value must be 1 <= timeout <= 255, using %d\n",
- WATCHDOG_TIMEOUT);
- }
-
- ret = register_reboot_notifier(&wdt_notifier);
- if (ret != 0) {
- pr_err("cannot register reboot notifier (err=%d)\n", ret);
- goto unreg_regions;
- }
-
- ret = misc_register(&wdt_miscdev);
- if (ret != 0) {
- pr_err("cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
- goto unreg_reboot;
- }
-
- pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
- timeout, nowayout);
-
-out:
- return ret;
-unreg_reboot:
- unregister_reboot_notifier(&wdt_notifier);
-unreg_regions:
- release_region(wdt_io, 2);
- goto out;
-}
-
-static void __exit wdt_exit(void)
-{
- misc_deregister(&wdt_miscdev);
- unregister_reboot_notifier(&wdt_notifier);
- release_region(wdt_io, 2);
-}
-
-module_init(wdt_init);
-module_exit(wdt_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Marcus Junker <junker@anduras.de>");
-MODULE_AUTHOR("Samuel Tardieu <sam@rfc1149.net>");
-MODULE_DESCRIPTION("w83697hf/hg WDT driver");
+++ /dev/null
-/*
- * w83697ug/uf WDT driver
- *
- * (c) Copyright 2008 Flemming Fransen <ff@nrvissing.net>
- * reused original code to support w83697ug/uf.
- *
- * Based on w83627hf_wdt.c which is based on advantechwdt.c
- * which is based on wdt.c.
- * Original copyright messages:
- *
- * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
- * added support for W83627THF.
- *
- * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
- *
- * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
- *
- * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
- * http://www.redhat.com
- *
- * 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 of the License, or (at your option) any later version.
- *
- * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
- * warranty for any of this software. This material is provided
- * "AS-IS" and at no charge.
- *
- * (c) Copyright 1995 Alan Cox <alan@redhat.com>
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/fs.h>
-#include <linux/ioport.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/io.h>
-#include <linux/uaccess.h>
-
-
-#define WATCHDOG_NAME "w83697ug/uf WDT"
-#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
-
-static unsigned long wdt_is_open;
-static char expect_close;
-static DEFINE_SPINLOCK(io_lock);
-
-static int wdt_io = 0x2e;
-module_param(wdt_io, int, 0);
-MODULE_PARM_DESC(wdt_io, "w83697ug/uf WDT io port (default 0x2e)");
-
-static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout,
- "Watchdog timeout in seconds. 1<= timeout <=255 (default="
- __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
-
-static bool nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, bool, 0);
-MODULE_PARM_DESC(nowayout,
- "Watchdog cannot be stopped once started (default="
- __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-
-/*
- * Kernel methods.
- */
-
-#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
-#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
- (same as EFER) */
-#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
-
-static int w83697ug_select_wd_register(void)
-{
- unsigned char c;
- unsigned char version;
-
- outb_p(0x87, WDT_EFER); /* Enter extended function mode */
- outb_p(0x87, WDT_EFER); /* Again according to manual */
-
- outb(0x20, WDT_EFER); /* check chip version */
- version = inb(WDT_EFDR);
-
- if (version == 0x68) { /* W83697UG */
- pr_info("Watchdog chip version 0x%02x = W83697UG/UF found at 0x%04x\n",
- version, wdt_io);
-
- outb_p(0x2b, WDT_EFER);
- c = inb_p(WDT_EFDR); /* select WDT0 */
- c &= ~0x04;
- outb_p(0x2b, WDT_EFER);
- outb_p(c, WDT_EFDR); /* set pin118 to WDT0 */
-
- } else {
- pr_err("No W83697UG/UF could be found\n");
- return -ENODEV;
- }
-
- outb_p(0x07, WDT_EFER); /* point to logical device number reg */
- outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
- outb_p(0x30, WDT_EFER); /* select CR30 */
- c = inb_p(WDT_EFDR);
- outb_p(c | 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
-
- return 0;
-}
-
-static void w83697ug_unselect_wd_register(void)
-{
- outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
-}
-
-static int w83697ug_init(void)
-{
- int ret;
- unsigned char t;
-
- ret = w83697ug_select_wd_register();
- if (ret != 0)
- return ret;
-
- outb_p(0xF6, WDT_EFER); /* Select CRF6 */
- t = inb_p(WDT_EFDR); /* read CRF6 */
- if (t != 0) {
- pr_info("Watchdog already running. Resetting timeout to %d sec\n",
- timeout);
- outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */
- }
- outb_p(0xF5, WDT_EFER); /* Select CRF5 */
- t = inb_p(WDT_EFDR); /* read CRF5 */
- t &= ~0x0C; /* set second mode &
- disable keyboard turning off watchdog */
- outb_p(t, WDT_EFDR); /* Write back to CRF5 */
-
- w83697ug_unselect_wd_register();
- return 0;
-}
-
-static void wdt_ctrl(int timeout)
-{
- spin_lock(&io_lock);
-
- if (w83697ug_select_wd_register() < 0) {
- spin_unlock(&io_lock);
- return;
- }
-
- outb_p(0xF4, WDT_EFER); /* Select CRF4 */
- outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */
-
- w83697ug_unselect_wd_register();
-
- spin_unlock(&io_lock);
-}
-
-static int wdt_ping(void)
-{
- wdt_ctrl(timeout);
- return 0;
-}
-
-static int wdt_disable(void)
-{
- wdt_ctrl(0);
- return 0;
-}
-
-static int wdt_set_heartbeat(int t)
-{
- if (t < 1 || t > 255)
- return -EINVAL;
-
- timeout = t;
- return 0;
-}
-
-static ssize_t wdt_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- if (count) {
- if (!nowayout) {
- size_t i;
-
- expect_close = 0;
-
- for (i = 0; i != count; i++) {
- char c;
- if (get_user(c, buf + i))
- return -EFAULT;
- if (c == 'V')
- expect_close = 42;
- }
- }
- wdt_ping();
- }
- return count;
-}
-
-static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- int new_timeout;
- static const struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING |
- WDIOF_SETTIMEOUT |
- WDIOF_MAGICCLOSE,
- .firmware_version = 1,
- .identity = "W83697UG WDT",
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- if (copy_to_user(argp, &ident, sizeof(ident)))
- return -EFAULT;
- break;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_SETOPTIONS:
- {
- int options, retval = -EINVAL;
-
- if (get_user(options, p))
- return -EFAULT;
-
- if (options & WDIOS_DISABLECARD) {
- wdt_disable();
- retval = 0;
- }
-
- if (options & WDIOS_ENABLECARD) {
- wdt_ping();
- retval = 0;
- }
-
- return retval;
- }
-
- case WDIOC_KEEPALIVE:
- wdt_ping();
- break;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_timeout, p))
- return -EFAULT;
- if (wdt_set_heartbeat(new_timeout))
- return -EINVAL;
- wdt_ping();
- /* Fall */
-
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
-
- default:
- return -ENOTTY;
- }
- return 0;
-}
-
-static int wdt_open(struct inode *inode, struct file *file)
-{
- if (test_and_set_bit(0, &wdt_is_open))
- return -EBUSY;
- /*
- * Activate
- */
-
- wdt_ping();
- return nonseekable_open(inode, file);
-}
-
-static int wdt_close(struct inode *inode, struct file *file)
-{
- if (expect_close == 42)
- wdt_disable();
- else {
- pr_crit("Unexpected close, not stopping watchdog!\n");
- wdt_ping();
- }
- expect_close = 0;
- clear_bit(0, &wdt_is_open);
- return 0;
-}
-
-/*
- * Notifier for system down
- */
-
-static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
- void *unused)
-{
- if (code == SYS_DOWN || code == SYS_HALT)
- wdt_disable(); /* Turn the WDT off */
-
- return NOTIFY_DONE;
-}
-
-/*
- * Kernel Interfaces
- */
-
-static const struct file_operations wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = wdt_write,
- .unlocked_ioctl = wdt_ioctl,
- .open = wdt_open,
- .release = wdt_close,
-};
-
-static struct miscdevice wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &wdt_fops,
-};
-
-/*
- * The WDT needs to learn about soft shutdowns in order to
- * turn the timebomb registers off.
- */
-
-static struct notifier_block wdt_notifier = {
- .notifier_call = wdt_notify_sys,
-};
-
-static int __init wdt_init(void)
-{
- int ret;
-
- pr_info("WDT driver for the Winbond(TM) W83697UG/UF Super I/O chip initialising\n");
-
- if (wdt_set_heartbeat(timeout)) {
- wdt_set_heartbeat(WATCHDOG_TIMEOUT);
- pr_info("timeout value must be 1<=timeout<=255, using %d\n",
- WATCHDOG_TIMEOUT);
- }
-
- if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
- pr_err("I/O address 0x%04x already in use\n", wdt_io);
- ret = -EIO;
- goto out;
- }
-
- ret = w83697ug_init();
- if (ret != 0)
- goto unreg_regions;
-
- ret = register_reboot_notifier(&wdt_notifier);
- if (ret != 0) {
- pr_err("cannot register reboot notifier (err=%d)\n", ret);
- goto unreg_regions;
- }
-
- ret = misc_register(&wdt_miscdev);
- if (ret != 0) {
- pr_err("cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
- goto unreg_reboot;
- }
-
- pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
- timeout, nowayout);
-
-out:
- return ret;
-unreg_reboot:
- unregister_reboot_notifier(&wdt_notifier);
-unreg_regions:
- release_region(wdt_io, 1);
- goto out;
-}
-
-static void __exit wdt_exit(void)
-{
- misc_deregister(&wdt_miscdev);
- unregister_reboot_notifier(&wdt_notifier);
- release_region(wdt_io, 1);
-}
-
-module_init(wdt_init);
-module_exit(wdt_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Flemming Frandsen <ff@nrvissing.net>");
-MODULE_DESCRIPTION("w83697ug/uf WDT driver");
projects / firefly-linux-kernel-4.4.55.git / commitdiff