2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/kernel.h>
29 #include <linux/list.h>
30 #include <linux/sched.h>
32 #include <linux/device.h>
33 #include <linux/proc_fs.h>
34 #include <linux/acpi.h>
35 #include <linux/slab.h>
36 #include <linux/regulator/machine.h>
38 #include <asm/mpspec.h>
40 #include <linux/pci.h>
41 #include <acpi/acpi_bus.h>
42 #include <acpi/acpi_drivers.h>
43 #include <acpi/apei.h>
44 #include <linux/dmi.h>
45 #include <linux/suspend.h>
49 #define _COMPONENT ACPI_BUS_COMPONENT
50 ACPI_MODULE_NAME("bus");
52 struct acpi_device *acpi_root;
53 struct proc_dir_entry *acpi_root_dir;
54 EXPORT_SYMBOL(acpi_root_dir);
56 #define STRUCT_TO_INT(s) (*((int*)&s))
60 #ifdef CONFIG_ACPI_CUSTOM_DSDT
61 static inline int set_copy_dsdt(const struct dmi_system_id *id)
66 static int set_copy_dsdt(const struct dmi_system_id *id)
68 printk(KERN_NOTICE "%s detected - "
69 "force copy of DSDT to local memory\n", id->ident);
70 acpi_gbl_copy_dsdt_locally = 1;
75 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
77 * Invoke DSDT corruption work-around on all Toshiba Satellite.
78 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
81 .callback = set_copy_dsdt,
82 .ident = "TOSHIBA Satellite",
84 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
85 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
91 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
96 /* --------------------------------------------------------------------------
98 -------------------------------------------------------------------------- */
100 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
102 acpi_status status = AE_OK;
108 /* TBD: Support fixed-feature devices */
110 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
111 if (ACPI_FAILURE(status) || !*device) {
112 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
120 EXPORT_SYMBOL(acpi_bus_get_device);
122 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
123 unsigned long long *sta)
127 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
128 if (ACPI_SUCCESS(status))
131 if (status == AE_NOT_FOUND) {
132 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
133 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
139 int acpi_bus_get_status(struct acpi_device *device)
142 unsigned long long sta;
144 status = acpi_bus_get_status_handle(device->handle, &sta);
145 if (ACPI_FAILURE(status))
148 STRUCT_TO_INT(device->status) = (int) sta;
150 if (device->status.functional && !device->status.present) {
151 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
152 "functional but not present;\n",
154 (u32) STRUCT_TO_INT(device->status)));
157 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
159 (u32) STRUCT_TO_INT(device->status)));
162 EXPORT_SYMBOL(acpi_bus_get_status);
164 void acpi_bus_private_data_handler(acpi_handle handle,
169 EXPORT_SYMBOL(acpi_bus_private_data_handler);
171 int acpi_bus_get_private_data(acpi_handle handle, void **data)
173 acpi_status status = AE_OK;
178 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
179 if (ACPI_FAILURE(status) || !*data) {
180 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
187 EXPORT_SYMBOL(acpi_bus_get_private_data);
189 static void acpi_print_osc_error(acpi_handle handle,
190 struct acpi_osc_context *context, char *error)
192 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
195 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
196 printk(KERN_DEBUG "%s\n", error);
198 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
199 kfree(buffer.pointer);
201 printk(KERN_DEBUG"_OSC request data:");
202 for (i = 0; i < context->cap.length; i += sizeof(u32))
203 printk("%x ", *((u32 *)(context->cap.pointer + i)));
207 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
210 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
211 24, 26, 28, 30, 32, 34};
213 if (strlen(str) != 36)
214 return AE_BAD_PARAMETER;
215 for (i = 0; i < 36; i++) {
216 if (i == 8 || i == 13 || i == 18 || i == 23) {
218 return AE_BAD_PARAMETER;
219 } else if (!isxdigit(str[i]))
220 return AE_BAD_PARAMETER;
222 for (i = 0; i < 16; i++) {
223 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
224 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
229 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
232 struct acpi_object_list input;
233 union acpi_object in_params[4];
234 union acpi_object *out_obj;
237 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
241 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
243 context->ret.length = ACPI_ALLOCATE_BUFFER;
244 context->ret.pointer = NULL;
246 /* Setting up input parameters */
248 input.pointer = in_params;
249 in_params[0].type = ACPI_TYPE_BUFFER;
250 in_params[0].buffer.length = 16;
251 in_params[0].buffer.pointer = uuid;
252 in_params[1].type = ACPI_TYPE_INTEGER;
253 in_params[1].integer.value = context->rev;
254 in_params[2].type = ACPI_TYPE_INTEGER;
255 in_params[2].integer.value = context->cap.length/sizeof(u32);
256 in_params[3].type = ACPI_TYPE_BUFFER;
257 in_params[3].buffer.length = context->cap.length;
258 in_params[3].buffer.pointer = context->cap.pointer;
260 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
261 if (ACPI_FAILURE(status))
265 return AE_NULL_OBJECT;
267 out_obj = output.pointer;
268 if (out_obj->type != ACPI_TYPE_BUFFER
269 || out_obj->buffer.length != context->cap.length) {
270 acpi_print_osc_error(handle, context,
271 "_OSC evaluation returned wrong type");
275 /* Need to ignore the bit0 in result code */
276 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
278 if (errors & OSC_REQUEST_ERROR)
279 acpi_print_osc_error(handle, context,
280 "_OSC request failed");
281 if (errors & OSC_INVALID_UUID_ERROR)
282 acpi_print_osc_error(handle, context,
283 "_OSC invalid UUID");
284 if (errors & OSC_INVALID_REVISION_ERROR)
285 acpi_print_osc_error(handle, context,
286 "_OSC invalid revision");
287 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
288 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
298 context->ret.length = out_obj->buffer.length;
299 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
300 context->ret.length, GFP_KERNEL);
301 if (!context->ret.pointer) {
302 status = AE_NO_MEMORY;
308 kfree(output.pointer);
310 context->ret.pointer = NULL;
313 EXPORT_SYMBOL(acpi_run_osc);
315 bool osc_sb_apei_support_acked;
316 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
317 static void acpi_bus_osc_support(void)
320 struct acpi_osc_context context = {
321 .uuid_str = sb_uuid_str,
324 .cap.pointer = capbuf,
328 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
329 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
330 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
331 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
332 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
335 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
336 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
339 #ifdef ACPI_HOTPLUG_OST
340 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
344 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
345 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
347 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
348 u32 *capbuf_ret = context.ret.pointer;
349 if (context.ret.length > OSC_SUPPORT_TYPE)
350 osc_sb_apei_support_acked =
351 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
352 kfree(context.ret.pointer);
354 /* do we need to check other returned cap? Sounds no */
357 /* --------------------------------------------------------------------------
359 -------------------------------------------------------------------------- */
361 #ifdef CONFIG_ACPI_PROC_EVENT
362 static DEFINE_SPINLOCK(acpi_bus_event_lock);
364 LIST_HEAD(acpi_bus_event_list);
365 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
367 extern int event_is_open;
369 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
371 struct acpi_bus_event *event;
372 unsigned long flags = 0;
374 /* drop event on the floor if no one's listening */
378 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
382 strcpy(event->device_class, device_class);
383 strcpy(event->bus_id, bus_id);
387 spin_lock_irqsave(&acpi_bus_event_lock, flags);
388 list_add_tail(&event->node, &acpi_bus_event_list);
389 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
391 wake_up_interruptible(&acpi_bus_event_queue);
397 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
399 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
403 return acpi_bus_generate_proc_event4(device->pnp.device_class,
404 device->pnp.bus_id, type, data);
407 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
409 int acpi_bus_receive_event(struct acpi_bus_event *event)
411 unsigned long flags = 0;
412 struct acpi_bus_event *entry = NULL;
414 DECLARE_WAITQUEUE(wait, current);
420 if (list_empty(&acpi_bus_event_list)) {
422 set_current_state(TASK_INTERRUPTIBLE);
423 add_wait_queue(&acpi_bus_event_queue, &wait);
425 if (list_empty(&acpi_bus_event_list))
428 remove_wait_queue(&acpi_bus_event_queue, &wait);
429 set_current_state(TASK_RUNNING);
431 if (signal_pending(current))
435 spin_lock_irqsave(&acpi_bus_event_lock, flags);
436 if (!list_empty(&acpi_bus_event_list)) {
437 entry = list_entry(acpi_bus_event_list.next,
438 struct acpi_bus_event, node);
439 list_del(&entry->node);
441 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
446 memcpy(event, entry, sizeof(struct acpi_bus_event));
453 #endif /* CONFIG_ACPI_PROC_EVENT */
455 /* --------------------------------------------------------------------------
456 Notification Handling
457 -------------------------------------------------------------------------- */
459 static void acpi_bus_check_device(acpi_handle handle)
461 struct acpi_device *device;
463 struct acpi_device_status old_status;
465 if (acpi_bus_get_device(handle, &device))
470 old_status = device->status;
473 * Make sure this device's parent is present before we go about
474 * messing with the device.
476 if (device->parent && !device->parent->status.present) {
477 device->status = device->parent->status;
481 status = acpi_bus_get_status(device);
482 if (ACPI_FAILURE(status))
485 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
489 * Device Insertion/Removal
491 if ((device->status.present) && !(old_status.present)) {
492 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
493 /* TBD: Handle device insertion */
494 } else if (!(device->status.present) && (old_status.present)) {
495 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
496 /* TBD: Handle device removal */
500 static void acpi_bus_check_scope(acpi_handle handle)
503 acpi_bus_check_device(handle);
506 * TBD: Enumerate child devices within this device's scope and
507 * run acpi_bus_check_device()'s on them.
511 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
512 int register_acpi_bus_notifier(struct notifier_block *nb)
514 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
516 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
518 void unregister_acpi_bus_notifier(struct notifier_block *nb)
520 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
522 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
527 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
529 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
531 struct acpi_device *device = NULL;
532 struct acpi_driver *driver;
534 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
537 blocking_notifier_call_chain(&acpi_bus_notify_list,
538 type, (void *)handle);
542 case ACPI_NOTIFY_BUS_CHECK:
543 acpi_bus_check_scope(handle);
545 * TBD: We'll need to outsource certain events to non-ACPI
546 * drivers via the device manager (device.c).
550 case ACPI_NOTIFY_DEVICE_CHECK:
551 acpi_bus_check_device(handle);
553 * TBD: We'll need to outsource certain events to non-ACPI
554 * drivers via the device manager (device.c).
558 case ACPI_NOTIFY_DEVICE_WAKE:
562 case ACPI_NOTIFY_EJECT_REQUEST:
566 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
567 /* TBD: Exactly what does 'light' mean? */
570 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
574 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
578 case ACPI_NOTIFY_POWER_FAULT:
583 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
584 "Received unknown/unsupported notification [%08x]\n",
589 acpi_bus_get_device(handle, &device);
591 driver = device->driver;
592 if (driver && driver->ops.notify &&
593 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
594 driver->ops.notify(device, type);
598 /* --------------------------------------------------------------------------
599 Initialization/Cleanup
600 -------------------------------------------------------------------------- */
602 static int __init acpi_bus_init_irq(void)
604 acpi_status status = AE_OK;
605 union acpi_object arg = { ACPI_TYPE_INTEGER };
606 struct acpi_object_list arg_list = { 1, &arg };
607 char *message = NULL;
611 * Let the system know what interrupt model we are using by
612 * evaluating the \_PIC object, if exists.
615 switch (acpi_irq_model) {
616 case ACPI_IRQ_MODEL_PIC:
619 case ACPI_IRQ_MODEL_IOAPIC:
622 case ACPI_IRQ_MODEL_IOSAPIC:
625 case ACPI_IRQ_MODEL_PLATFORM:
626 message = "platform specific model";
629 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
633 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
635 arg.integer.value = acpi_irq_model;
637 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
638 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
639 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
646 u8 acpi_gbl_permanent_mmap;
649 void __init acpi_early_init(void)
651 acpi_status status = AE_OK;
656 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
658 /* enable workarounds, unless strict ACPI spec. compliance */
660 acpi_gbl_enable_interpreter_slack = TRUE;
662 acpi_gbl_permanent_mmap = 1;
665 * If the machine falls into the DMI check table,
666 * DSDT will be copied to memory
668 dmi_check_system(dsdt_dmi_table);
670 status = acpi_reallocate_root_table();
671 if (ACPI_FAILURE(status)) {
672 printk(KERN_ERR PREFIX
673 "Unable to reallocate ACPI tables\n");
677 status = acpi_initialize_subsystem();
678 if (ACPI_FAILURE(status)) {
679 printk(KERN_ERR PREFIX
680 "Unable to initialize the ACPI Interpreter\n");
684 status = acpi_load_tables();
685 if (ACPI_FAILURE(status)) {
686 printk(KERN_ERR PREFIX
687 "Unable to load the System Description Tables\n");
693 /* compatible (0) means level (3) */
694 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
695 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
696 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
698 /* Set PIC-mode SCI trigger type */
699 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
700 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
703 * now that acpi_gbl_FADT is initialized,
704 * update it with result from INT_SRC_OVR parsing
706 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
710 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
711 if (ACPI_FAILURE(status)) {
712 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
717 * If the system is using ACPI then we can be reasonably
718 * confident that any regulators are managed by the firmware
719 * so tell the regulator core it has everything it needs to
722 regulator_has_full_constraints();
731 static int __init acpi_bus_init(void)
734 acpi_status status = AE_OK;
735 extern acpi_status acpi_os_initialize1(void);
737 acpi_os_initialize1();
739 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
740 if (ACPI_FAILURE(status)) {
741 printk(KERN_ERR PREFIX
742 "Unable to start the ACPI Interpreter\n");
747 * ACPI 2.0 requires the EC driver to be loaded and work before
748 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
751 * This is accomplished by looking for the ECDT table, and getting
752 * the EC parameters out of that.
754 status = acpi_ec_ecdt_probe();
755 /* Ignore result. Not having an ECDT is not fatal. */
757 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
758 if (ACPI_FAILURE(status)) {
759 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
764 * _OSC method may exist in module level code,
765 * so it must be run after ACPI_FULL_INITIALIZATION
767 acpi_bus_osc_support();
770 * _PDC control method may load dynamic SSDT tables,
771 * and we need to install the table handler before that.
775 acpi_early_processor_set_pdc();
778 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
779 * is necessary to enable it as early as possible.
781 acpi_boot_ec_enable();
783 printk(KERN_INFO PREFIX "Interpreter enabled\n");
785 /* Initialize sleep structures */
789 * Get the system interrupt model and evaluate \_PIC.
791 result = acpi_bus_init_irq();
796 * Register the for all standard device notifications.
799 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
800 &acpi_bus_notify, NULL);
801 if (ACPI_FAILURE(status)) {
802 printk(KERN_ERR PREFIX
803 "Unable to register for device notifications\n");
808 * Create the top ACPI proc directory
810 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
814 /* Mimic structured exception handling */
820 struct kobject *acpi_kobj;
821 EXPORT_SYMBOL_GPL(acpi_kobj);
823 static int __init acpi_init(void)
828 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
832 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
834 printk(KERN_WARNING "%s: kset create error\n", __func__);
838 init_acpi_device_notify();
839 result = acpi_bus_init();
845 pci_mmcfg_late_init();
849 acpi_sleep_proc_init();
850 acpi_wakeup_device_init();
854 subsys_initcall(acpi_init);