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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/ioport.h>
24 #include <linux/kernel.h>
25 #include <linux/list.h>
26 #include <linux/sched.h>
28 #include <linux/device.h>
29 #include <linux/proc_fs.h>
30 #include <linux/acpi.h>
31 #include <linux/slab.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/workqueue.h>
34 #include <linux/reboot.h>
35 #include <linux/delay.h>
37 #include <asm/mpspec.h>
39 #include <linux/acpi_iort.h>
40 #include <linux/pci.h>
41 #include <acpi/apei.h>
42 #include <linux/dmi.h>
43 #include <linux/suspend.h>
47 #define _COMPONENT ACPI_BUS_COMPONENT
48 ACPI_MODULE_NAME("bus");
50 struct acpi_device
*acpi_root
;
51 struct proc_dir_entry
*acpi_root_dir
;
52 EXPORT_SYMBOL(acpi_root_dir
);
55 #ifdef CONFIG_ACPI_CUSTOM_DSDT
56 static inline int set_copy_dsdt(const struct dmi_system_id
*id
)
61 static int set_copy_dsdt(const struct dmi_system_id
*id
)
63 printk(KERN_NOTICE
"%s detected - "
64 "force copy of DSDT to local memory\n", id
->ident
);
65 acpi_gbl_copy_dsdt_locally
= 1;
70 static struct dmi_system_id dsdt_dmi_table
[] __initdata
= {
72 * Invoke DSDT corruption work-around on all Toshiba Satellite.
73 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
76 .callback
= set_copy_dsdt
,
77 .ident
= "TOSHIBA Satellite",
79 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
80 DMI_MATCH(DMI_PRODUCT_NAME
, "Satellite"),
86 static struct dmi_system_id dsdt_dmi_table
[] __initdata
= {
91 /* --------------------------------------------------------------------------
93 -------------------------------------------------------------------------- */
95 acpi_status
acpi_bus_get_status_handle(acpi_handle handle
,
96 unsigned long long *sta
)
100 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, sta
);
101 if (ACPI_SUCCESS(status
))
104 if (status
== AE_NOT_FOUND
) {
105 *sta
= ACPI_STA_DEVICE_PRESENT
| ACPI_STA_DEVICE_ENABLED
|
106 ACPI_STA_DEVICE_UI
| ACPI_STA_DEVICE_FUNCTIONING
;
112 int acpi_bus_get_status(struct acpi_device
*device
)
115 unsigned long long sta
;
117 if (acpi_device_always_present(device
)) {
118 acpi_set_device_status(device
, ACPI_STA_DEFAULT
);
122 status
= acpi_bus_get_status_handle(device
->handle
, &sta
);
123 if (ACPI_FAILURE(status
))
126 acpi_set_device_status(device
, sta
);
128 if (device
->status
.functional
&& !device
->status
.present
) {
129 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]: "
130 "functional but not present;\n",
131 device
->pnp
.bus_id
, (u32
)sta
));
134 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]\n",
135 device
->pnp
.bus_id
, (u32
)sta
));
138 EXPORT_SYMBOL(acpi_bus_get_status
);
140 void acpi_bus_private_data_handler(acpi_handle handle
,
145 EXPORT_SYMBOL(acpi_bus_private_data_handler
);
147 int acpi_bus_attach_private_data(acpi_handle handle
, void *data
)
151 status
= acpi_attach_data(handle
,
152 acpi_bus_private_data_handler
, data
);
153 if (ACPI_FAILURE(status
)) {
154 acpi_handle_debug(handle
, "Error attaching device data\n");
160 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data
);
162 int acpi_bus_get_private_data(acpi_handle handle
, void **data
)
169 status
= acpi_get_data(handle
, acpi_bus_private_data_handler
, data
);
170 if (ACPI_FAILURE(status
)) {
171 acpi_handle_debug(handle
, "No context for object\n");
177 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data
);
179 void acpi_bus_detach_private_data(acpi_handle handle
)
181 acpi_detach_data(handle
, acpi_bus_private_data_handler
);
183 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data
);
185 static void acpi_print_osc_error(acpi_handle handle
,
186 struct acpi_osc_context
*context
, char *error
)
190 acpi_handle_debug(handle
, "(%s): %s\n", context
->uuid_str
, error
);
192 pr_debug("_OSC request data:");
193 for (i
= 0; i
< context
->cap
.length
; i
+= sizeof(u32
))
194 pr_debug(" %x", *((u32
*)(context
->cap
.pointer
+ i
)));
199 acpi_status
acpi_run_osc(acpi_handle handle
, struct acpi_osc_context
*context
)
202 struct acpi_object_list input
;
203 union acpi_object in_params
[4];
204 union acpi_object
*out_obj
;
207 struct acpi_buffer output
= {ACPI_ALLOCATE_BUFFER
, NULL
};
211 if (guid_parse(context
->uuid_str
, &guid
))
213 context
->ret
.length
= ACPI_ALLOCATE_BUFFER
;
214 context
->ret
.pointer
= NULL
;
216 /* Setting up input parameters */
218 input
.pointer
= in_params
;
219 in_params
[0].type
= ACPI_TYPE_BUFFER
;
220 in_params
[0].buffer
.length
= 16;
221 in_params
[0].buffer
.pointer
= (u8
*)&guid
;
222 in_params
[1].type
= ACPI_TYPE_INTEGER
;
223 in_params
[1].integer
.value
= context
->rev
;
224 in_params
[2].type
= ACPI_TYPE_INTEGER
;
225 in_params
[2].integer
.value
= context
->cap
.length
/sizeof(u32
);
226 in_params
[3].type
= ACPI_TYPE_BUFFER
;
227 in_params
[3].buffer
.length
= context
->cap
.length
;
228 in_params
[3].buffer
.pointer
= context
->cap
.pointer
;
230 status
= acpi_evaluate_object(handle
, "_OSC", &input
, &output
);
231 if (ACPI_FAILURE(status
))
235 return AE_NULL_OBJECT
;
237 out_obj
= output
.pointer
;
238 if (out_obj
->type
!= ACPI_TYPE_BUFFER
239 || out_obj
->buffer
.length
!= context
->cap
.length
) {
240 acpi_print_osc_error(handle
, context
,
241 "_OSC evaluation returned wrong type");
245 /* Need to ignore the bit0 in result code */
246 errors
= *((u32
*)out_obj
->buffer
.pointer
) & ~(1 << 0);
248 if (errors
& OSC_REQUEST_ERROR
)
249 acpi_print_osc_error(handle
, context
,
250 "_OSC request failed");
251 if (errors
& OSC_INVALID_UUID_ERROR
)
252 acpi_print_osc_error(handle
, context
,
253 "_OSC invalid UUID");
254 if (errors
& OSC_INVALID_REVISION_ERROR
)
255 acpi_print_osc_error(handle
, context
,
256 "_OSC invalid revision");
257 if (errors
& OSC_CAPABILITIES_MASK_ERROR
) {
258 if (((u32
*)context
->cap
.pointer
)[OSC_QUERY_DWORD
]
268 context
->ret
.length
= out_obj
->buffer
.length
;
269 context
->ret
.pointer
= kmemdup(out_obj
->buffer
.pointer
,
270 context
->ret
.length
, GFP_KERNEL
);
271 if (!context
->ret
.pointer
) {
272 status
= AE_NO_MEMORY
;
278 kfree(output
.pointer
);
280 context
->ret
.pointer
= NULL
;
283 EXPORT_SYMBOL(acpi_run_osc
);
285 bool osc_sb_apei_support_acked
;
288 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
289 * OSPM supports platform coordinated low power idle(LPI) states
291 bool osc_pc_lpi_support_confirmed
;
292 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed
);
294 static u8 sb_uuid_str
[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
295 static void acpi_bus_osc_support(void)
298 struct acpi_osc_context context
= {
299 .uuid_str
= sb_uuid_str
,
302 .cap
.pointer
= capbuf
,
306 capbuf
[OSC_QUERY_DWORD
] = OSC_QUERY_ENABLE
;
307 capbuf
[OSC_SUPPORT_DWORD
] = OSC_SB_PR3_SUPPORT
; /* _PR3 is in use */
308 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR
))
309 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_PAD_SUPPORT
;
310 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR
))
311 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_PPC_OST_SUPPORT
;
313 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_HOTPLUG_OST_SUPPORT
;
314 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_PCLPI_SUPPORT
;
317 if (boot_cpu_has(X86_FEATURE_HWP
)) {
318 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_CPC_SUPPORT
;
319 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_CPCV2_SUPPORT
;
323 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO
))
324 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT
;
327 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_APEI_SUPPORT
;
328 if (ACPI_FAILURE(acpi_get_handle(NULL
, "\\_SB", &handle
)))
330 if (ACPI_SUCCESS(acpi_run_osc(handle
, &context
))) {
331 u32
*capbuf_ret
= context
.ret
.pointer
;
332 if (context
.ret
.length
> OSC_SUPPORT_DWORD
) {
333 osc_sb_apei_support_acked
=
334 capbuf_ret
[OSC_SUPPORT_DWORD
] & OSC_SB_APEI_SUPPORT
;
335 osc_pc_lpi_support_confirmed
=
336 capbuf_ret
[OSC_SUPPORT_DWORD
] & OSC_SB_PCLPI_SUPPORT
;
338 kfree(context
.ret
.pointer
);
340 /* do we need to check other returned cap? Sounds no */
343 /* --------------------------------------------------------------------------
344 Notification Handling
345 -------------------------------------------------------------------------- */
350 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
352 static void acpi_bus_notify(acpi_handle handle
, u32 type
, void *data
)
354 struct acpi_device
*adev
;
355 struct acpi_driver
*driver
;
356 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
357 bool hotplug_event
= false;
360 case ACPI_NOTIFY_BUS_CHECK
:
361 acpi_handle_debug(handle
, "ACPI_NOTIFY_BUS_CHECK event\n");
362 hotplug_event
= true;
365 case ACPI_NOTIFY_DEVICE_CHECK
:
366 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_CHECK event\n");
367 hotplug_event
= true;
370 case ACPI_NOTIFY_DEVICE_WAKE
:
371 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_WAKE event\n");
374 case ACPI_NOTIFY_EJECT_REQUEST
:
375 acpi_handle_debug(handle
, "ACPI_NOTIFY_EJECT_REQUEST event\n");
376 hotplug_event
= true;
379 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT
:
380 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
381 /* TBD: Exactly what does 'light' mean? */
384 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
385 acpi_handle_err(handle
, "Device cannot be configured due "
386 "to a frequency mismatch\n");
389 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
390 acpi_handle_err(handle
, "Device cannot be configured due "
391 "to a bus mode mismatch\n");
394 case ACPI_NOTIFY_POWER_FAULT
:
395 acpi_handle_err(handle
, "Device has suffered a power fault\n");
399 acpi_handle_debug(handle
, "Unknown event type 0x%x\n", type
);
403 adev
= acpi_bus_get_acpi_device(handle
);
407 driver
= adev
->driver
;
408 if (driver
&& driver
->ops
.notify
&&
409 (driver
->flags
& ACPI_DRIVER_ALL_NOTIFY_EVENTS
))
410 driver
->ops
.notify(adev
, type
);
412 if (hotplug_event
&& ACPI_SUCCESS(acpi_hotplug_schedule(adev
, type
)))
415 acpi_bus_put_acpi_device(adev
);
419 acpi_evaluate_ost(handle
, type
, ost_code
, NULL
);
422 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
424 struct acpi_device
*device
= data
;
426 device
->driver
->ops
.notify(device
, event
);
429 static void acpi_device_notify_fixed(void *data
)
431 struct acpi_device
*device
= data
;
433 /* Fixed hardware devices have no handles */
434 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
437 static u32
acpi_device_fixed_event(void *data
)
439 acpi_os_execute(OSL_NOTIFY_HANDLER
, acpi_device_notify_fixed
, data
);
440 return ACPI_INTERRUPT_HANDLED
;
443 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
447 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
449 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
450 acpi_device_fixed_event
,
452 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
454 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
455 acpi_device_fixed_event
,
458 status
= acpi_install_notify_handler(device
->handle
,
463 if (ACPI_FAILURE(status
))
468 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
470 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
471 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
472 acpi_device_fixed_event
);
473 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
474 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
475 acpi_device_fixed_event
);
477 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
481 /* Handle events targeting \_SB device (at present only graceful shutdown) */
483 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
484 #define ACPI_SB_INDICATE_INTERVAL 10000
486 static void sb_notify_work(struct work_struct
*dummy
)
488 acpi_handle sb_handle
;
490 orderly_poweroff(true);
493 * After initiating graceful shutdown, the ACPI spec requires OSPM
494 * to evaluate _OST method once every 10seconds to indicate that
495 * the shutdown is in progress
497 acpi_get_handle(NULL
, "\\_SB", &sb_handle
);
499 pr_info("Graceful shutdown in progress.\n");
500 acpi_evaluate_ost(sb_handle
, ACPI_OST_EC_OSPM_SHUTDOWN
,
501 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS
, NULL
);
502 msleep(ACPI_SB_INDICATE_INTERVAL
);
506 static void acpi_sb_notify(acpi_handle handle
, u32 event
, void *data
)
508 static DECLARE_WORK(acpi_sb_work
, sb_notify_work
);
510 if (event
== ACPI_SB_NOTIFY_SHUTDOWN_REQUEST
) {
511 if (!work_busy(&acpi_sb_work
))
512 schedule_work(&acpi_sb_work
);
514 pr_warn("event %x is not supported by \\_SB device\n", event
);
517 static int __init
acpi_setup_sb_notify_handler(void)
519 acpi_handle sb_handle
;
521 if (ACPI_FAILURE(acpi_get_handle(NULL
, "\\_SB", &sb_handle
)))
524 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle
, ACPI_DEVICE_NOTIFY
,
525 acpi_sb_notify
, NULL
)))
531 /* --------------------------------------------------------------------------
533 -------------------------------------------------------------------------- */
536 * acpi_get_first_physical_node - Get first physical node of an ACPI device
537 * @adev: ACPI device in question
539 * Return: First physical node of ACPI device @adev
541 struct device
*acpi_get_first_physical_node(struct acpi_device
*adev
)
543 struct mutex
*physical_node_lock
= &adev
->physical_node_lock
;
544 struct device
*phys_dev
;
546 mutex_lock(physical_node_lock
);
547 if (list_empty(&adev
->physical_node_list
)) {
550 const struct acpi_device_physical_node
*node
;
552 node
= list_first_entry(&adev
->physical_node_list
,
553 struct acpi_device_physical_node
, node
);
555 phys_dev
= node
->dev
;
557 mutex_unlock(physical_node_lock
);
561 static struct acpi_device
*acpi_primary_dev_companion(struct acpi_device
*adev
,
562 const struct device
*dev
)
564 const struct device
*phys_dev
= acpi_get_first_physical_node(adev
);
566 return phys_dev
&& phys_dev
== dev
? adev
: NULL
;
570 * acpi_device_is_first_physical_node - Is given dev first physical node
571 * @adev: ACPI companion device
572 * @dev: Physical device to check
574 * Function checks if given @dev is the first physical devices attached to
575 * the ACPI companion device. This distinction is needed in some cases
576 * where the same companion device is shared between many physical devices.
578 * Note that the caller have to provide valid @adev pointer.
580 bool acpi_device_is_first_physical_node(struct acpi_device
*adev
,
581 const struct device
*dev
)
583 return !!acpi_primary_dev_companion(adev
, dev
);
587 * acpi_companion_match() - Can we match via ACPI companion device
588 * @dev: Device in question
590 * Check if the given device has an ACPI companion and if that companion has
591 * a valid list of PNP IDs, and if the device is the first (primary) physical
592 * device associated with it. Return the companion pointer if that's the case
595 * If multiple physical devices are attached to a single ACPI companion, we need
596 * to be careful. The usage scenario for this kind of relationship is that all
597 * of the physical devices in question use resources provided by the ACPI
598 * companion. A typical case is an MFD device where all the sub-devices share
599 * the parent's ACPI companion. In such cases we can only allow the primary
600 * (first) physical device to be matched with the help of the companion's PNP
603 * Additional physical devices sharing the ACPI companion can still use
604 * resources available from it but they will be matched normally using functions
605 * provided by their bus types (and analogously for their modalias).
607 struct acpi_device
*acpi_companion_match(const struct device
*dev
)
609 struct acpi_device
*adev
;
611 adev
= ACPI_COMPANION(dev
);
615 if (list_empty(&adev
->pnp
.ids
))
618 return acpi_primary_dev_companion(adev
, dev
);
622 * acpi_of_match_device - Match device object using the "compatible" property.
623 * @adev: ACPI device object to match.
624 * @of_match_table: List of device IDs to match against.
626 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
627 * identifiers and a _DSD object with the "compatible" property, use that
628 * property to match against the given list of identifiers.
630 static bool acpi_of_match_device(struct acpi_device
*adev
,
631 const struct of_device_id
*of_match_table
)
633 const union acpi_object
*of_compatible
, *obj
;
639 of_compatible
= adev
->data
.of_compatible
;
640 if (!of_match_table
|| !of_compatible
)
643 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
644 nval
= of_compatible
->package
.count
;
645 obj
= of_compatible
->package
.elements
;
646 } else { /* Must be ACPI_TYPE_STRING. */
650 /* Now we can look for the driver DT compatible strings */
651 for (i
= 0; i
< nval
; i
++, obj
++) {
652 const struct of_device_id
*id
;
654 for (id
= of_match_table
; id
->compatible
[0]; id
++)
655 if (!strcasecmp(obj
->string
.pointer
, id
->compatible
))
662 static bool acpi_of_modalias(struct acpi_device
*adev
,
663 char *modalias
, size_t len
)
665 const union acpi_object
*of_compatible
;
666 const union acpi_object
*obj
;
667 const char *str
, *chr
;
669 of_compatible
= adev
->data
.of_compatible
;
673 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
)
674 obj
= of_compatible
->package
.elements
;
675 else /* Must be ACPI_TYPE_STRING. */
678 str
= obj
->string
.pointer
;
679 chr
= strchr(str
, ',');
680 strlcpy(modalias
, chr
? chr
+ 1 : str
, len
);
686 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
687 * @adev: ACPI device object to match
688 * @default_id: ID string to use as default if no compatible string found
689 * @modalias: Pointer to buffer that modalias value will be copied into
690 * @len: Length of modalias buffer
692 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
693 * If there is a compatible string for @adev, it will be copied to @modalias
694 * with the vendor prefix stripped; otherwise, @default_id will be used.
696 void acpi_set_modalias(struct acpi_device
*adev
, const char *default_id
,
697 char *modalias
, size_t len
)
699 if (!acpi_of_modalias(adev
, modalias
, len
))
700 strlcpy(modalias
, default_id
, len
);
702 EXPORT_SYMBOL_GPL(acpi_set_modalias
);
704 static bool __acpi_match_device_cls(const struct acpi_device_id
*id
,
705 struct acpi_hardware_id
*hwid
)
707 int i
, msk
, byte_shift
;
713 /* Apply class-code bitmask, before checking each class-code byte */
714 for (i
= 1; i
<= 3; i
++) {
715 byte_shift
= 8 * (3 - i
);
716 msk
= (id
->cls_msk
>> byte_shift
) & 0xFF;
720 sprintf(buf
, "%02x", (id
->cls
>> byte_shift
) & msk
);
721 if (strncmp(buf
, &hwid
->id
[(i
- 1) * 2], 2))
727 static const struct acpi_device_id
*__acpi_match_device(
728 struct acpi_device
*device
,
729 const struct acpi_device_id
*ids
,
730 const struct of_device_id
*of_ids
)
732 const struct acpi_device_id
*id
;
733 struct acpi_hardware_id
*hwid
;
736 * If the device is not present, it is unnecessary to load device
739 if (!device
|| !device
->status
.present
)
742 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
743 /* First, check the ACPI/PNP IDs provided by the caller. */
744 for (id
= ids
; id
->id
[0] || id
->cls
; id
++) {
745 if (id
->id
[0] && !strcmp((char *) id
->id
, hwid
->id
))
747 else if (id
->cls
&& __acpi_match_device_cls(id
, hwid
))
752 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
753 * "compatible" property if found.
755 * The id returned by the below is not valid, but the only
756 * caller passing non-NULL of_ids here is only interested in
757 * whether or not the return value is NULL.
759 if (!strcmp(ACPI_DT_NAMESPACE_HID
, hwid
->id
)
760 && acpi_of_match_device(device
, of_ids
))
767 * acpi_match_device - Match a struct device against a given list of ACPI IDs
768 * @ids: Array of struct acpi_device_id object to match against.
769 * @dev: The device structure to match.
771 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
772 * object for that handle and use that object to match against a given list of
775 * Return a pointer to the first matching ID on success or %NULL on failure.
777 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
778 const struct device
*dev
)
780 return __acpi_match_device(acpi_companion_match(dev
), ids
, NULL
);
782 EXPORT_SYMBOL_GPL(acpi_match_device
);
784 int acpi_match_device_ids(struct acpi_device
*device
,
785 const struct acpi_device_id
*ids
)
787 return __acpi_match_device(device
, ids
, NULL
) ? 0 : -ENOENT
;
789 EXPORT_SYMBOL(acpi_match_device_ids
);
791 bool acpi_driver_match_device(struct device
*dev
,
792 const struct device_driver
*drv
)
794 if (!drv
->acpi_match_table
)
795 return acpi_of_match_device(ACPI_COMPANION(dev
),
796 drv
->of_match_table
);
798 return !!__acpi_match_device(acpi_companion_match(dev
),
799 drv
->acpi_match_table
, drv
->of_match_table
);
801 EXPORT_SYMBOL_GPL(acpi_driver_match_device
);
803 /* --------------------------------------------------------------------------
804 ACPI Driver Management
805 -------------------------------------------------------------------------- */
808 * acpi_bus_register_driver - register a driver with the ACPI bus
809 * @driver: driver being registered
811 * Registers a driver with the ACPI bus. Searches the namespace for all
812 * devices that match the driver's criteria and binds. Returns zero for
813 * success or a negative error status for failure.
815 int acpi_bus_register_driver(struct acpi_driver
*driver
)
821 driver
->drv
.name
= driver
->name
;
822 driver
->drv
.bus
= &acpi_bus_type
;
823 driver
->drv
.owner
= driver
->owner
;
825 ret
= driver_register(&driver
->drv
);
829 EXPORT_SYMBOL(acpi_bus_register_driver
);
832 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
833 * @driver: driver to unregister
835 * Unregisters a driver with the ACPI bus. Searches the namespace for all
836 * devices that match the driver's criteria and unbinds.
838 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
840 driver_unregister(&driver
->drv
);
843 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
845 /* --------------------------------------------------------------------------
847 -------------------------------------------------------------------------- */
849 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
851 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
852 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
854 return acpi_dev
->flags
.match_driver
855 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
858 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
860 return __acpi_device_uevent_modalias(to_acpi_device(dev
), env
);
863 static int acpi_device_probe(struct device
*dev
)
865 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
866 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
869 if (acpi_dev
->handler
&& !acpi_is_pnp_device(acpi_dev
))
872 if (!acpi_drv
->ops
.add
)
875 ret
= acpi_drv
->ops
.add(acpi_dev
);
879 acpi_dev
->driver
= acpi_drv
;
880 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
881 "Driver [%s] successfully bound to device [%s]\n",
882 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
884 if (acpi_drv
->ops
.notify
) {
885 ret
= acpi_device_install_notify_handler(acpi_dev
);
887 if (acpi_drv
->ops
.remove
)
888 acpi_drv
->ops
.remove(acpi_dev
);
890 acpi_dev
->driver
= NULL
;
891 acpi_dev
->driver_data
= NULL
;
896 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
897 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
902 static int acpi_device_remove(struct device
* dev
)
904 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
905 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
908 if (acpi_drv
->ops
.notify
)
909 acpi_device_remove_notify_handler(acpi_dev
);
910 if (acpi_drv
->ops
.remove
)
911 acpi_drv
->ops
.remove(acpi_dev
);
913 acpi_dev
->driver
= NULL
;
914 acpi_dev
->driver_data
= NULL
;
920 struct bus_type acpi_bus_type
= {
922 .match
= acpi_bus_match
,
923 .probe
= acpi_device_probe
,
924 .remove
= acpi_device_remove
,
925 .uevent
= acpi_device_uevent
,
928 /* --------------------------------------------------------------------------
929 Initialization/Cleanup
930 -------------------------------------------------------------------------- */
932 static int __init
acpi_bus_init_irq(void)
935 char *message
= NULL
;
939 * Let the system know what interrupt model we are using by
940 * evaluating the \_PIC object, if exists.
943 switch (acpi_irq_model
) {
944 case ACPI_IRQ_MODEL_PIC
:
947 case ACPI_IRQ_MODEL_IOAPIC
:
950 case ACPI_IRQ_MODEL_IOSAPIC
:
953 case ACPI_IRQ_MODEL_GIC
:
956 case ACPI_IRQ_MODEL_PLATFORM
:
957 message
= "platform specific model";
960 printk(KERN_WARNING PREFIX
"Unknown interrupt routing model\n");
964 printk(KERN_INFO PREFIX
"Using %s for interrupt routing\n", message
);
966 status
= acpi_execute_simple_method(NULL
, "\\_PIC", acpi_irq_model
);
967 if (ACPI_FAILURE(status
) && (status
!= AE_NOT_FOUND
)) {
968 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PIC"));
976 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
978 * The ACPI tables are accessible after this, but the handling of events has not
979 * been initialized and the global lock is not available yet, so AML should not
980 * be executed at this point.
982 * Doing this before switching the EFI runtime services to virtual mode allows
983 * the EfiBootServices memory to be freed slightly earlier on boot.
985 void __init
acpi_early_init(void)
992 printk(KERN_INFO PREFIX
"Core revision %08x\n", ACPI_CA_VERSION
);
994 /* It's safe to verify table checksums during late stage */
995 acpi_gbl_verify_table_checksum
= TRUE
;
997 /* enable workarounds, unless strict ACPI spec. compliance */
999 acpi_gbl_enable_interpreter_slack
= TRUE
;
1001 acpi_permanent_mmap
= true;
1004 * If the machine falls into the DMI check table,
1005 * DSDT will be copied to memory
1007 dmi_check_system(dsdt_dmi_table
);
1009 status
= acpi_reallocate_root_table();
1010 if (ACPI_FAILURE(status
)) {
1011 printk(KERN_ERR PREFIX
1012 "Unable to reallocate ACPI tables\n");
1016 status
= acpi_initialize_subsystem();
1017 if (ACPI_FAILURE(status
)) {
1018 printk(KERN_ERR PREFIX
1019 "Unable to initialize the ACPI Interpreter\n");
1023 if (!acpi_gbl_parse_table_as_term_list
&&
1024 acpi_gbl_group_module_level_code
) {
1025 status
= acpi_load_tables();
1026 if (ACPI_FAILURE(status
)) {
1027 printk(KERN_ERR PREFIX
1028 "Unable to load the System Description Tables\n");
1035 /* compatible (0) means level (3) */
1036 if (!(acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
)) {
1037 acpi_sci_flags
&= ~ACPI_MADT_TRIGGER_MASK
;
1038 acpi_sci_flags
|= ACPI_MADT_TRIGGER_LEVEL
;
1040 /* Set PIC-mode SCI trigger type */
1041 acpi_pic_sci_set_trigger(acpi_gbl_FADT
.sci_interrupt
,
1042 (acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
) >> 2);
1045 * now that acpi_gbl_FADT is initialized,
1046 * update it with result from INT_SRC_OVR parsing
1048 acpi_gbl_FADT
.sci_interrupt
= acpi_sci_override_gsi
;
1058 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1060 * Switch over the platform to the ACPI mode (if possible).
1062 * Doing this too early is generally unsafe, but at the same time it needs to be
1063 * done before all things that really depend on ACPI. The right spot appears to
1064 * be before finalizing the EFI initialization.
1066 void __init
acpi_subsystem_init(void)
1073 status
= acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE
);
1074 if (ACPI_FAILURE(status
)) {
1075 printk(KERN_ERR PREFIX
"Unable to enable ACPI\n");
1079 * If the system is using ACPI then we can be reasonably
1080 * confident that any regulators are managed by the firmware
1081 * so tell the regulator core it has everything it needs to
1084 regulator_has_full_constraints();
1088 static acpi_status
acpi_bus_table_handler(u32 event
, void *table
, void *context
)
1090 acpi_scan_table_handler(event
, table
, context
);
1092 return acpi_sysfs_table_handler(event
, table
, context
);
1095 static int __init
acpi_bus_init(void)
1100 acpi_os_initialize1();
1103 * ACPI 2.0 requires the EC driver to be loaded and work before
1104 * the EC device is found in the namespace (i.e. before
1105 * acpi_load_tables() is called).
1107 * This is accomplished by looking for the ECDT table, and getting
1108 * the EC parameters out of that.
1110 status
= acpi_ec_ecdt_probe();
1111 /* Ignore result. Not having an ECDT is not fatal. */
1113 if (acpi_gbl_parse_table_as_term_list
||
1114 !acpi_gbl_group_module_level_code
) {
1115 status
= acpi_load_tables();
1116 if (ACPI_FAILURE(status
)) {
1117 printk(KERN_ERR PREFIX
1118 "Unable to load the System Description Tables\n");
1123 status
= acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE
);
1124 if (ACPI_FAILURE(status
)) {
1125 printk(KERN_ERR PREFIX
1126 "Unable to start the ACPI Interpreter\n");
1130 status
= acpi_initialize_objects(ACPI_FULL_INITIALIZATION
);
1131 if (ACPI_FAILURE(status
)) {
1132 printk(KERN_ERR PREFIX
"Unable to initialize ACPI objects\n");
1136 /* Set capability bits for _OSC under processor scope */
1137 acpi_early_processor_osc();
1140 * _OSC method may exist in module level code,
1141 * so it must be run after ACPI_FULL_INITIALIZATION
1143 acpi_bus_osc_support();
1146 * _PDC control method may load dynamic SSDT tables,
1147 * and we need to install the table handler before that.
1149 status
= acpi_install_table_handler(acpi_bus_table_handler
, NULL
);
1153 acpi_early_processor_set_pdc();
1156 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1157 * is necessary to enable it as early as possible.
1159 acpi_ec_dsdt_probe();
1161 printk(KERN_INFO PREFIX
"Interpreter enabled\n");
1163 /* Initialize sleep structures */
1167 * Get the system interrupt model and evaluate \_PIC.
1169 result
= acpi_bus_init_irq();
1174 * Register the for all standard device notifications.
1177 acpi_install_notify_handler(ACPI_ROOT_OBJECT
, ACPI_SYSTEM_NOTIFY
,
1178 &acpi_bus_notify
, NULL
);
1179 if (ACPI_FAILURE(status
)) {
1180 printk(KERN_ERR PREFIX
1181 "Unable to register for device notifications\n");
1186 * Create the top ACPI proc directory
1188 acpi_root_dir
= proc_mkdir(ACPI_BUS_FILE_ROOT
, NULL
);
1190 result
= bus_register(&acpi_bus_type
);
1194 /* Mimic structured exception handling */
1200 struct kobject
*acpi_kobj
;
1201 EXPORT_SYMBOL_GPL(acpi_kobj
);
1203 static int __init
acpi_init(void)
1207 if (acpi_disabled
) {
1208 printk(KERN_INFO PREFIX
"Interpreter disabled.\n");
1212 acpi_kobj
= kobject_create_and_add("acpi", firmware_kobj
);
1214 printk(KERN_WARNING
"%s: kset create error\n", __func__
);
1218 init_acpi_device_notify();
1219 result
= acpi_bus_init();
1225 pci_mmcfg_late_init();
1229 acpi_debugfs_init();
1230 acpi_sleep_proc_init();
1231 acpi_wakeup_device_init();
1232 acpi_debugger_init();
1233 acpi_setup_sb_notify_handler();
1237 subsys_initcall(acpi_init
);