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 static int set_copy_dsdt(const struct dmi_system_id *id)
62 printk(KERN_NOTICE "%s detected - "
63 "force copy of DSDT to local memory\n", id->ident);
64 acpi_gbl_copy_dsdt_locally = 1;
68 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
70 * Invoke DSDT corruption work-around on all Toshiba Satellite.
71 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
74 .callback = set_copy_dsdt,
75 .ident = "TOSHIBA Satellite",
77 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
78 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
84 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
89 /* --------------------------------------------------------------------------
91 -------------------------------------------------------------------------- */
93 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
95 acpi_status status = AE_OK;
101 /* TBD: Support fixed-feature devices */
103 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
104 if (ACPI_FAILURE(status) || !*device) {
105 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
113 EXPORT_SYMBOL(acpi_bus_get_device);
115 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
116 unsigned long long *sta)
120 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
121 if (ACPI_SUCCESS(status))
124 if (status == AE_NOT_FOUND) {
125 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
126 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
132 int acpi_bus_get_status(struct acpi_device *device)
135 unsigned long long sta;
137 status = acpi_bus_get_status_handle(device->handle, &sta);
138 if (ACPI_FAILURE(status))
141 STRUCT_TO_INT(device->status) = (int) sta;
143 if (device->status.functional && !device->status.present) {
144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
145 "functional but not present;\n",
147 (u32) STRUCT_TO_INT(device->status)));
150 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
152 (u32) STRUCT_TO_INT(device->status)));
155 EXPORT_SYMBOL(acpi_bus_get_status);
157 void acpi_bus_private_data_handler(acpi_handle handle,
162 EXPORT_SYMBOL(acpi_bus_private_data_handler);
164 int acpi_bus_get_private_data(acpi_handle handle, void **data)
166 acpi_status status = AE_OK;
171 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
172 if (ACPI_FAILURE(status) || !*data) {
173 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
180 EXPORT_SYMBOL(acpi_bus_get_private_data);
182 static void acpi_print_osc_error(acpi_handle handle,
183 struct acpi_osc_context *context, char *error)
185 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
188 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
189 printk(KERN_DEBUG "%s\n", error);
191 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
192 kfree(buffer.pointer);
194 printk(KERN_DEBUG"_OSC request data:");
195 for (i = 0; i < context->cap.length; i += sizeof(u32))
196 printk("%x ", *((u32 *)(context->cap.pointer + i)));
200 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
203 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
204 24, 26, 28, 30, 32, 34};
206 if (strlen(str) != 36)
207 return AE_BAD_PARAMETER;
208 for (i = 0; i < 36; i++) {
209 if (i == 8 || i == 13 || i == 18 || i == 23) {
211 return AE_BAD_PARAMETER;
212 } else if (!isxdigit(str[i]))
213 return AE_BAD_PARAMETER;
215 for (i = 0; i < 16; i++) {
216 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
217 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
222 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
225 struct acpi_object_list input;
226 union acpi_object in_params[4];
227 union acpi_object *out_obj;
230 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
234 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
236 context->ret.length = ACPI_ALLOCATE_BUFFER;
237 context->ret.pointer = NULL;
239 /* Setting up input parameters */
241 input.pointer = in_params;
242 in_params[0].type = ACPI_TYPE_BUFFER;
243 in_params[0].buffer.length = 16;
244 in_params[0].buffer.pointer = uuid;
245 in_params[1].type = ACPI_TYPE_INTEGER;
246 in_params[1].integer.value = context->rev;
247 in_params[2].type = ACPI_TYPE_INTEGER;
248 in_params[2].integer.value = context->cap.length/sizeof(u32);
249 in_params[3].type = ACPI_TYPE_BUFFER;
250 in_params[3].buffer.length = context->cap.length;
251 in_params[3].buffer.pointer = context->cap.pointer;
253 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
254 if (ACPI_FAILURE(status))
258 return AE_NULL_OBJECT;
260 out_obj = output.pointer;
261 if (out_obj->type != ACPI_TYPE_BUFFER
262 || out_obj->buffer.length != context->cap.length) {
263 acpi_print_osc_error(handle, context,
264 "_OSC evaluation returned wrong type");
268 /* Need to ignore the bit0 in result code */
269 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
271 if (errors & OSC_REQUEST_ERROR)
272 acpi_print_osc_error(handle, context,
273 "_OSC request failed");
274 if (errors & OSC_INVALID_UUID_ERROR)
275 acpi_print_osc_error(handle, context,
276 "_OSC invalid UUID");
277 if (errors & OSC_INVALID_REVISION_ERROR)
278 acpi_print_osc_error(handle, context,
279 "_OSC invalid revision");
280 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
281 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
291 context->ret.length = out_obj->buffer.length;
292 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
293 context->ret.length, GFP_KERNEL);
294 if (!context->ret.pointer) {
295 status = AE_NO_MEMORY;
301 kfree(output.pointer);
303 context->ret.pointer = NULL;
306 EXPORT_SYMBOL(acpi_run_osc);
308 bool osc_sb_apei_support_acked;
309 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
310 static void acpi_bus_osc_support(void)
313 struct acpi_osc_context context = {
314 .uuid_str = sb_uuid_str,
317 .cap.pointer = capbuf,
321 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
322 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
323 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
324 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
325 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
328 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
329 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
332 #ifdef ACPI_HOTPLUG_OST
333 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
337 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
338 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
340 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
341 u32 *capbuf_ret = context.ret.pointer;
342 if (context.ret.length > OSC_SUPPORT_TYPE)
343 osc_sb_apei_support_acked =
344 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
345 kfree(context.ret.pointer);
347 /* do we need to check other returned cap? Sounds no */
350 /* --------------------------------------------------------------------------
352 -------------------------------------------------------------------------- */
354 #ifdef CONFIG_ACPI_PROC_EVENT
355 static DEFINE_SPINLOCK(acpi_bus_event_lock);
357 LIST_HEAD(acpi_bus_event_list);
358 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
360 extern int event_is_open;
362 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
364 struct acpi_bus_event *event;
365 unsigned long flags = 0;
367 /* drop event on the floor if no one's listening */
371 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
375 strcpy(event->device_class, device_class);
376 strcpy(event->bus_id, bus_id);
380 spin_lock_irqsave(&acpi_bus_event_lock, flags);
381 list_add_tail(&event->node, &acpi_bus_event_list);
382 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
384 wake_up_interruptible(&acpi_bus_event_queue);
390 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
392 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
396 return acpi_bus_generate_proc_event4(device->pnp.device_class,
397 device->pnp.bus_id, type, data);
400 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
402 int acpi_bus_receive_event(struct acpi_bus_event *event)
404 unsigned long flags = 0;
405 struct acpi_bus_event *entry = NULL;
407 DECLARE_WAITQUEUE(wait, current);
413 if (list_empty(&acpi_bus_event_list)) {
415 set_current_state(TASK_INTERRUPTIBLE);
416 add_wait_queue(&acpi_bus_event_queue, &wait);
418 if (list_empty(&acpi_bus_event_list))
421 remove_wait_queue(&acpi_bus_event_queue, &wait);
422 set_current_state(TASK_RUNNING);
424 if (signal_pending(current))
428 spin_lock_irqsave(&acpi_bus_event_lock, flags);
429 if (!list_empty(&acpi_bus_event_list)) {
430 entry = list_entry(acpi_bus_event_list.next,
431 struct acpi_bus_event, node);
432 list_del(&entry->node);
434 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
439 memcpy(event, entry, sizeof(struct acpi_bus_event));
446 #endif /* CONFIG_ACPI_PROC_EVENT */
448 /* --------------------------------------------------------------------------
449 Notification Handling
450 -------------------------------------------------------------------------- */
452 static void acpi_bus_check_device(acpi_handle handle)
454 struct acpi_device *device;
456 struct acpi_device_status old_status;
458 if (acpi_bus_get_device(handle, &device))
463 old_status = device->status;
466 * Make sure this device's parent is present before we go about
467 * messing with the device.
469 if (device->parent && !device->parent->status.present) {
470 device->status = device->parent->status;
474 status = acpi_bus_get_status(device);
475 if (ACPI_FAILURE(status))
478 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
482 * Device Insertion/Removal
484 if ((device->status.present) && !(old_status.present)) {
485 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
486 /* TBD: Handle device insertion */
487 } else if (!(device->status.present) && (old_status.present)) {
488 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
489 /* TBD: Handle device removal */
493 static void acpi_bus_check_scope(acpi_handle handle)
496 acpi_bus_check_device(handle);
499 * TBD: Enumerate child devices within this device's scope and
500 * run acpi_bus_check_device()'s on them.
504 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
505 int register_acpi_bus_notifier(struct notifier_block *nb)
507 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
509 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
511 void unregister_acpi_bus_notifier(struct notifier_block *nb)
513 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
515 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
520 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
522 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
524 struct acpi_device *device = NULL;
525 struct acpi_driver *driver;
527 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
530 blocking_notifier_call_chain(&acpi_bus_notify_list,
531 type, (void *)handle);
535 case ACPI_NOTIFY_BUS_CHECK:
536 acpi_bus_check_scope(handle);
538 * TBD: We'll need to outsource certain events to non-ACPI
539 * drivers via the device manager (device.c).
543 case ACPI_NOTIFY_DEVICE_CHECK:
544 acpi_bus_check_device(handle);
546 * TBD: We'll need to outsource certain events to non-ACPI
547 * drivers via the device manager (device.c).
551 case ACPI_NOTIFY_DEVICE_WAKE:
555 case ACPI_NOTIFY_EJECT_REQUEST:
559 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
560 /* TBD: Exactly what does 'light' mean? */
563 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
567 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
571 case ACPI_NOTIFY_POWER_FAULT:
576 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
577 "Received unknown/unsupported notification [%08x]\n",
582 acpi_bus_get_device(handle, &device);
584 driver = device->driver;
585 if (driver && driver->ops.notify &&
586 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
587 driver->ops.notify(device, type);
591 /* --------------------------------------------------------------------------
592 Initialization/Cleanup
593 -------------------------------------------------------------------------- */
595 static int __init acpi_bus_init_irq(void)
597 acpi_status status = AE_OK;
598 union acpi_object arg = { ACPI_TYPE_INTEGER };
599 struct acpi_object_list arg_list = { 1, &arg };
600 char *message = NULL;
604 * Let the system know what interrupt model we are using by
605 * evaluating the \_PIC object, if exists.
608 switch (acpi_irq_model) {
609 case ACPI_IRQ_MODEL_PIC:
612 case ACPI_IRQ_MODEL_IOAPIC:
615 case ACPI_IRQ_MODEL_IOSAPIC:
618 case ACPI_IRQ_MODEL_PLATFORM:
619 message = "platform specific model";
622 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
626 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
628 arg.integer.value = acpi_irq_model;
630 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
631 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
632 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
639 u8 acpi_gbl_permanent_mmap;
642 void __init acpi_early_init(void)
644 acpi_status status = AE_OK;
649 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
651 /* enable workarounds, unless strict ACPI spec. compliance */
653 acpi_gbl_enable_interpreter_slack = TRUE;
655 acpi_gbl_permanent_mmap = 1;
658 * If the machine falls into the DMI check table,
659 * DSDT will be copied to memory
661 dmi_check_system(dsdt_dmi_table);
663 status = acpi_reallocate_root_table();
664 if (ACPI_FAILURE(status)) {
665 printk(KERN_ERR PREFIX
666 "Unable to reallocate ACPI tables\n");
670 status = acpi_initialize_subsystem();
671 if (ACPI_FAILURE(status)) {
672 printk(KERN_ERR PREFIX
673 "Unable to initialize the ACPI Interpreter\n");
677 status = acpi_load_tables();
678 if (ACPI_FAILURE(status)) {
679 printk(KERN_ERR PREFIX
680 "Unable to load the System Description Tables\n");
686 /* compatible (0) means level (3) */
687 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
688 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
689 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
691 /* Set PIC-mode SCI trigger type */
692 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
693 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
696 * now that acpi_gbl_FADT is initialized,
697 * update it with result from INT_SRC_OVR parsing
699 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
703 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
704 if (ACPI_FAILURE(status)) {
705 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
710 * If the system is using ACPI then we can be reasonably
711 * confident that any regulators are managed by the firmware
712 * so tell the regulator core it has everything it needs to
715 regulator_has_full_constraints();
724 static int __init acpi_bus_init(void)
727 acpi_status status = AE_OK;
728 extern acpi_status acpi_os_initialize1(void);
730 acpi_os_initialize1();
732 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
733 if (ACPI_FAILURE(status)) {
734 printk(KERN_ERR PREFIX
735 "Unable to start the ACPI Interpreter\n");
740 * ACPI 2.0 requires the EC driver to be loaded and work before
741 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
744 * This is accomplished by looking for the ECDT table, and getting
745 * the EC parameters out of that.
747 status = acpi_ec_ecdt_probe();
748 /* Ignore result. Not having an ECDT is not fatal. */
750 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
751 if (ACPI_FAILURE(status)) {
752 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
757 * _OSC method may exist in module level code,
758 * so it must be run after ACPI_FULL_INITIALIZATION
760 acpi_bus_osc_support();
763 * _PDC control method may load dynamic SSDT tables,
764 * and we need to install the table handler before that.
768 acpi_early_processor_set_pdc();
771 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
772 * is necessary to enable it as early as possible.
774 acpi_boot_ec_enable();
776 printk(KERN_INFO PREFIX "Interpreter enabled\n");
778 /* Initialize sleep structures */
782 * Get the system interrupt model and evaluate \_PIC.
784 result = acpi_bus_init_irq();
789 * Register the for all standard device notifications.
792 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
793 &acpi_bus_notify, NULL);
794 if (ACPI_FAILURE(status)) {
795 printk(KERN_ERR PREFIX
796 "Unable to register for device notifications\n");
801 * Create the top ACPI proc directory
803 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
807 /* Mimic structured exception handling */
813 struct kobject *acpi_kobj;
814 EXPORT_SYMBOL_GPL(acpi_kobj);
816 static int __init acpi_init(void)
821 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
825 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
827 printk(KERN_WARNING "%s: kset create error\n", __func__);
831 init_acpi_device_notify();
832 result = acpi_bus_init();
838 pci_mmcfg_late_init();
842 acpi_sleep_proc_init();
843 acpi_wakeup_device_init();
847 subsys_initcall(acpi_init);