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;
69 static int set_gbl_term_list(const struct dmi_system_id
*id
)
71 acpi_gbl_parse_table_as_term_list
= 1;
75 static const struct dmi_system_id acpi_quirks_dmi_table
[] __initconst
= {
77 * Touchpad on Dell XPS 9570/Precision M5530 doesn't work under I2C
79 * https://bugzilla.kernel.org/show_bug.cgi?id=198515
82 .callback
= set_gbl_term_list
,
83 .ident
= "Dell Precision M5530",
85 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
86 DMI_MATCH(DMI_PRODUCT_NAME
, "Precision M5530"),
90 .callback
= set_gbl_term_list
,
91 .ident
= "Dell XPS 15 9570",
93 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
94 DMI_MATCH(DMI_PRODUCT_NAME
, "XPS 15 9570"),
98 * Invoke DSDT corruption work-around on all Toshiba Satellite.
99 * DSDT will be copied to memory.
100 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
103 .callback
= set_copy_dsdt
,
104 .ident
= "TOSHIBA Satellite",
106 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
107 DMI_MATCH(DMI_PRODUCT_NAME
, "Satellite"),
113 static const struct dmi_system_id acpi_quirks_dmi_table
[] __initconst
= {
118 /* --------------------------------------------------------------------------
120 -------------------------------------------------------------------------- */
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 if (acpi_device_always_present(device
)) {
145 acpi_set_device_status(device
, ACPI_STA_DEFAULT
);
149 /* Battery devices must have their deps met before calling _STA */
150 if (acpi_device_is_battery(device
) && device
->dep_unmet
) {
151 acpi_set_device_status(device
, 0);
155 status
= acpi_bus_get_status_handle(device
->handle
, &sta
);
156 if (ACPI_FAILURE(status
))
159 acpi_set_device_status(device
, sta
);
161 if (device
->status
.functional
&& !device
->status
.present
) {
162 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]: "
163 "functional but not present;\n",
164 device
->pnp
.bus_id
, (u32
)sta
));
167 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] status [%08x]\n",
168 device
->pnp
.bus_id
, (u32
)sta
));
171 EXPORT_SYMBOL(acpi_bus_get_status
);
173 void acpi_bus_private_data_handler(acpi_handle handle
,
178 EXPORT_SYMBOL(acpi_bus_private_data_handler
);
180 int acpi_bus_attach_private_data(acpi_handle handle
, void *data
)
184 status
= acpi_attach_data(handle
,
185 acpi_bus_private_data_handler
, data
);
186 if (ACPI_FAILURE(status
)) {
187 acpi_handle_debug(handle
, "Error attaching device data\n");
193 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data
);
195 int acpi_bus_get_private_data(acpi_handle handle
, void **data
)
202 status
= acpi_get_data(handle
, acpi_bus_private_data_handler
, data
);
203 if (ACPI_FAILURE(status
)) {
204 acpi_handle_debug(handle
, "No context for object\n");
210 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data
);
212 void acpi_bus_detach_private_data(acpi_handle handle
)
214 acpi_detach_data(handle
, acpi_bus_private_data_handler
);
216 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data
);
218 static void acpi_print_osc_error(acpi_handle handle
,
219 struct acpi_osc_context
*context
, char *error
)
223 acpi_handle_debug(handle
, "(%s): %s\n", context
->uuid_str
, error
);
225 pr_debug("_OSC request data:");
226 for (i
= 0; i
< context
->cap
.length
; i
+= sizeof(u32
))
227 pr_debug(" %x", *((u32
*)(context
->cap
.pointer
+ i
)));
232 acpi_status
acpi_run_osc(acpi_handle handle
, struct acpi_osc_context
*context
)
235 struct acpi_object_list input
;
236 union acpi_object in_params
[4];
237 union acpi_object
*out_obj
;
240 struct acpi_buffer output
= {ACPI_ALLOCATE_BUFFER
, NULL
};
244 if (guid_parse(context
->uuid_str
, &guid
))
246 context
->ret
.length
= ACPI_ALLOCATE_BUFFER
;
247 context
->ret
.pointer
= NULL
;
249 /* Setting up input parameters */
251 input
.pointer
= in_params
;
252 in_params
[0].type
= ACPI_TYPE_BUFFER
;
253 in_params
[0].buffer
.length
= 16;
254 in_params
[0].buffer
.pointer
= (u8
*)&guid
;
255 in_params
[1].type
= ACPI_TYPE_INTEGER
;
256 in_params
[1].integer
.value
= context
->rev
;
257 in_params
[2].type
= ACPI_TYPE_INTEGER
;
258 in_params
[2].integer
.value
= context
->cap
.length
/sizeof(u32
);
259 in_params
[3].type
= ACPI_TYPE_BUFFER
;
260 in_params
[3].buffer
.length
= context
->cap
.length
;
261 in_params
[3].buffer
.pointer
= context
->cap
.pointer
;
263 status
= acpi_evaluate_object(handle
, "_OSC", &input
, &output
);
264 if (ACPI_FAILURE(status
))
268 return AE_NULL_OBJECT
;
270 out_obj
= output
.pointer
;
271 if (out_obj
->type
!= ACPI_TYPE_BUFFER
272 || out_obj
->buffer
.length
!= context
->cap
.length
) {
273 acpi_print_osc_error(handle
, context
,
274 "_OSC evaluation returned wrong type");
278 /* Need to ignore the bit0 in result code */
279 errors
= *((u32
*)out_obj
->buffer
.pointer
) & ~(1 << 0);
281 if (errors
& OSC_REQUEST_ERROR
)
282 acpi_print_osc_error(handle
, context
,
283 "_OSC request failed");
284 if (errors
& OSC_INVALID_UUID_ERROR
)
285 acpi_print_osc_error(handle
, context
,
286 "_OSC invalid UUID");
287 if (errors
& OSC_INVALID_REVISION_ERROR
)
288 acpi_print_osc_error(handle
, context
,
289 "_OSC invalid revision");
290 if (errors
& OSC_CAPABILITIES_MASK_ERROR
) {
291 if (((u32
*)context
->cap
.pointer
)[OSC_QUERY_DWORD
]
301 context
->ret
.length
= out_obj
->buffer
.length
;
302 context
->ret
.pointer
= kmemdup(out_obj
->buffer
.pointer
,
303 context
->ret
.length
, GFP_KERNEL
);
304 if (!context
->ret
.pointer
) {
305 status
= AE_NO_MEMORY
;
311 kfree(output
.pointer
);
313 context
->ret
.pointer
= NULL
;
316 EXPORT_SYMBOL(acpi_run_osc
);
318 bool osc_sb_apei_support_acked
;
321 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
322 * OSPM supports platform coordinated low power idle(LPI) states
324 bool osc_pc_lpi_support_confirmed
;
325 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed
);
327 static u8 sb_uuid_str
[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
328 static void acpi_bus_osc_support(void)
331 struct acpi_osc_context context
= {
332 .uuid_str
= sb_uuid_str
,
335 .cap
.pointer
= capbuf
,
339 capbuf
[OSC_QUERY_DWORD
] = OSC_QUERY_ENABLE
;
340 capbuf
[OSC_SUPPORT_DWORD
] = OSC_SB_PR3_SUPPORT
; /* _PR3 is in use */
341 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR
))
342 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_PAD_SUPPORT
;
343 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR
))
344 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_PPC_OST_SUPPORT
;
346 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_HOTPLUG_OST_SUPPORT
;
347 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_PCLPI_SUPPORT
;
350 if (boot_cpu_has(X86_FEATURE_HWP
)) {
351 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_CPC_SUPPORT
;
352 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_CPCV2_SUPPORT
;
356 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO
))
357 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT
;
360 capbuf
[OSC_SUPPORT_DWORD
] |= OSC_SB_APEI_SUPPORT
;
361 if (ACPI_FAILURE(acpi_get_handle(NULL
, "\\_SB", &handle
)))
363 if (ACPI_SUCCESS(acpi_run_osc(handle
, &context
))) {
364 u32
*capbuf_ret
= context
.ret
.pointer
;
365 if (context
.ret
.length
> OSC_SUPPORT_DWORD
) {
366 osc_sb_apei_support_acked
=
367 capbuf_ret
[OSC_SUPPORT_DWORD
] & OSC_SB_APEI_SUPPORT
;
368 osc_pc_lpi_support_confirmed
=
369 capbuf_ret
[OSC_SUPPORT_DWORD
] & OSC_SB_PCLPI_SUPPORT
;
371 kfree(context
.ret
.pointer
);
373 /* do we need to check other returned cap? Sounds no */
376 /* --------------------------------------------------------------------------
377 Notification Handling
378 -------------------------------------------------------------------------- */
383 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
385 static void acpi_bus_notify(acpi_handle handle
, u32 type
, void *data
)
387 struct acpi_device
*adev
;
388 struct acpi_driver
*driver
;
389 u32 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
390 bool hotplug_event
= false;
393 case ACPI_NOTIFY_BUS_CHECK
:
394 acpi_handle_debug(handle
, "ACPI_NOTIFY_BUS_CHECK event\n");
395 hotplug_event
= true;
398 case ACPI_NOTIFY_DEVICE_CHECK
:
399 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_CHECK event\n");
400 hotplug_event
= true;
403 case ACPI_NOTIFY_DEVICE_WAKE
:
404 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_WAKE event\n");
407 case ACPI_NOTIFY_EJECT_REQUEST
:
408 acpi_handle_debug(handle
, "ACPI_NOTIFY_EJECT_REQUEST event\n");
409 hotplug_event
= true;
412 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT
:
413 acpi_handle_debug(handle
, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
414 /* TBD: Exactly what does 'light' mean? */
417 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
418 acpi_handle_err(handle
, "Device cannot be configured due "
419 "to a frequency mismatch\n");
422 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
423 acpi_handle_err(handle
, "Device cannot be configured due "
424 "to a bus mode mismatch\n");
427 case ACPI_NOTIFY_POWER_FAULT
:
428 acpi_handle_err(handle
, "Device has suffered a power fault\n");
432 acpi_handle_debug(handle
, "Unknown event type 0x%x\n", type
);
436 adev
= acpi_bus_get_acpi_device(handle
);
440 driver
= adev
->driver
;
441 if (driver
&& driver
->ops
.notify
&&
442 (driver
->flags
& ACPI_DRIVER_ALL_NOTIFY_EVENTS
))
443 driver
->ops
.notify(adev
, type
);
445 if (!hotplug_event
) {
446 acpi_bus_put_acpi_device(adev
);
450 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev
, type
)))
453 acpi_bus_put_acpi_device(adev
);
456 acpi_evaluate_ost(handle
, type
, ost_code
, NULL
);
459 static void acpi_device_notify(acpi_handle handle
, u32 event
, void *data
)
461 struct acpi_device
*device
= data
;
463 device
->driver
->ops
.notify(device
, event
);
466 static void acpi_device_notify_fixed(void *data
)
468 struct acpi_device
*device
= data
;
470 /* Fixed hardware devices have no handles */
471 acpi_device_notify(NULL
, ACPI_FIXED_HARDWARE_EVENT
, device
);
474 static u32
acpi_device_fixed_event(void *data
)
476 acpi_os_execute(OSL_NOTIFY_HANDLER
, acpi_device_notify_fixed
, data
);
477 return ACPI_INTERRUPT_HANDLED
;
480 static int acpi_device_install_notify_handler(struct acpi_device
*device
)
484 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
486 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
487 acpi_device_fixed_event
,
489 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
491 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
492 acpi_device_fixed_event
,
495 status
= acpi_install_notify_handler(device
->handle
,
500 if (ACPI_FAILURE(status
))
505 static void acpi_device_remove_notify_handler(struct acpi_device
*device
)
507 if (device
->device_type
== ACPI_BUS_TYPE_POWER_BUTTON
)
508 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON
,
509 acpi_device_fixed_event
);
510 else if (device
->device_type
== ACPI_BUS_TYPE_SLEEP_BUTTON
)
511 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON
,
512 acpi_device_fixed_event
);
514 acpi_remove_notify_handler(device
->handle
, ACPI_DEVICE_NOTIFY
,
518 /* Handle events targeting \_SB device (at present only graceful shutdown) */
520 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
521 #define ACPI_SB_INDICATE_INTERVAL 10000
523 static void sb_notify_work(struct work_struct
*dummy
)
525 acpi_handle sb_handle
;
527 orderly_poweroff(true);
530 * After initiating graceful shutdown, the ACPI spec requires OSPM
531 * to evaluate _OST method once every 10seconds to indicate that
532 * the shutdown is in progress
534 acpi_get_handle(NULL
, "\\_SB", &sb_handle
);
536 pr_info("Graceful shutdown in progress.\n");
537 acpi_evaluate_ost(sb_handle
, ACPI_OST_EC_OSPM_SHUTDOWN
,
538 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS
, NULL
);
539 msleep(ACPI_SB_INDICATE_INTERVAL
);
543 static void acpi_sb_notify(acpi_handle handle
, u32 event
, void *data
)
545 static DECLARE_WORK(acpi_sb_work
, sb_notify_work
);
547 if (event
== ACPI_SB_NOTIFY_SHUTDOWN_REQUEST
) {
548 if (!work_busy(&acpi_sb_work
))
549 schedule_work(&acpi_sb_work
);
551 pr_warn("event %x is not supported by \\_SB device\n", event
);
554 static int __init
acpi_setup_sb_notify_handler(void)
556 acpi_handle sb_handle
;
558 if (ACPI_FAILURE(acpi_get_handle(NULL
, "\\_SB", &sb_handle
)))
561 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle
, ACPI_DEVICE_NOTIFY
,
562 acpi_sb_notify
, NULL
)))
568 /* --------------------------------------------------------------------------
570 -------------------------------------------------------------------------- */
573 * acpi_get_first_physical_node - Get first physical node of an ACPI device
574 * @adev: ACPI device in question
576 * Return: First physical node of ACPI device @adev
578 struct device
*acpi_get_first_physical_node(struct acpi_device
*adev
)
580 struct mutex
*physical_node_lock
= &adev
->physical_node_lock
;
581 struct device
*phys_dev
;
583 mutex_lock(physical_node_lock
);
584 if (list_empty(&adev
->physical_node_list
)) {
587 const struct acpi_device_physical_node
*node
;
589 node
= list_first_entry(&adev
->physical_node_list
,
590 struct acpi_device_physical_node
, node
);
592 phys_dev
= node
->dev
;
594 mutex_unlock(physical_node_lock
);
598 static struct acpi_device
*acpi_primary_dev_companion(struct acpi_device
*adev
,
599 const struct device
*dev
)
601 const struct device
*phys_dev
= acpi_get_first_physical_node(adev
);
603 return phys_dev
&& phys_dev
== dev
? adev
: NULL
;
607 * acpi_device_is_first_physical_node - Is given dev first physical node
608 * @adev: ACPI companion device
609 * @dev: Physical device to check
611 * Function checks if given @dev is the first physical devices attached to
612 * the ACPI companion device. This distinction is needed in some cases
613 * where the same companion device is shared between many physical devices.
615 * Note that the caller have to provide valid @adev pointer.
617 bool acpi_device_is_first_physical_node(struct acpi_device
*adev
,
618 const struct device
*dev
)
620 return !!acpi_primary_dev_companion(adev
, dev
);
624 * acpi_companion_match() - Can we match via ACPI companion device
625 * @dev: Device in question
627 * Check if the given device has an ACPI companion and if that companion has
628 * a valid list of PNP IDs, and if the device is the first (primary) physical
629 * device associated with it. Return the companion pointer if that's the case
632 * If multiple physical devices are attached to a single ACPI companion, we need
633 * to be careful. The usage scenario for this kind of relationship is that all
634 * of the physical devices in question use resources provided by the ACPI
635 * companion. A typical case is an MFD device where all the sub-devices share
636 * the parent's ACPI companion. In such cases we can only allow the primary
637 * (first) physical device to be matched with the help of the companion's PNP
640 * Additional physical devices sharing the ACPI companion can still use
641 * resources available from it but they will be matched normally using functions
642 * provided by their bus types (and analogously for their modalias).
644 struct acpi_device
*acpi_companion_match(const struct device
*dev
)
646 struct acpi_device
*adev
;
648 adev
= ACPI_COMPANION(dev
);
652 if (list_empty(&adev
->pnp
.ids
))
655 return acpi_primary_dev_companion(adev
, dev
);
659 * acpi_of_match_device - Match device object using the "compatible" property.
660 * @adev: ACPI device object to match.
661 * @of_match_table: List of device IDs to match against.
663 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
664 * identifiers and a _DSD object with the "compatible" property, use that
665 * property to match against the given list of identifiers.
667 static bool acpi_of_match_device(struct acpi_device
*adev
,
668 const struct of_device_id
*of_match_table
)
670 const union acpi_object
*of_compatible
, *obj
;
676 of_compatible
= adev
->data
.of_compatible
;
677 if (!of_match_table
|| !of_compatible
)
680 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
) {
681 nval
= of_compatible
->package
.count
;
682 obj
= of_compatible
->package
.elements
;
683 } else { /* Must be ACPI_TYPE_STRING. */
687 /* Now we can look for the driver DT compatible strings */
688 for (i
= 0; i
< nval
; i
++, obj
++) {
689 const struct of_device_id
*id
;
691 for (id
= of_match_table
; id
->compatible
[0]; id
++)
692 if (!strcasecmp(obj
->string
.pointer
, id
->compatible
))
699 static bool acpi_of_modalias(struct acpi_device
*adev
,
700 char *modalias
, size_t len
)
702 const union acpi_object
*of_compatible
;
703 const union acpi_object
*obj
;
704 const char *str
, *chr
;
706 of_compatible
= adev
->data
.of_compatible
;
710 if (of_compatible
->type
== ACPI_TYPE_PACKAGE
)
711 obj
= of_compatible
->package
.elements
;
712 else /* Must be ACPI_TYPE_STRING. */
715 str
= obj
->string
.pointer
;
716 chr
= strchr(str
, ',');
717 strlcpy(modalias
, chr
? chr
+ 1 : str
, len
);
723 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
724 * @adev: ACPI device object to match
725 * @default_id: ID string to use as default if no compatible string found
726 * @modalias: Pointer to buffer that modalias value will be copied into
727 * @len: Length of modalias buffer
729 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
730 * If there is a compatible string for @adev, it will be copied to @modalias
731 * with the vendor prefix stripped; otherwise, @default_id will be used.
733 void acpi_set_modalias(struct acpi_device
*adev
, const char *default_id
,
734 char *modalias
, size_t len
)
736 if (!acpi_of_modalias(adev
, modalias
, len
))
737 strlcpy(modalias
, default_id
, len
);
739 EXPORT_SYMBOL_GPL(acpi_set_modalias
);
741 static bool __acpi_match_device_cls(const struct acpi_device_id
*id
,
742 struct acpi_hardware_id
*hwid
)
744 int i
, msk
, byte_shift
;
750 /* Apply class-code bitmask, before checking each class-code byte */
751 for (i
= 1; i
<= 3; i
++) {
752 byte_shift
= 8 * (3 - i
);
753 msk
= (id
->cls_msk
>> byte_shift
) & 0xFF;
757 sprintf(buf
, "%02x", (id
->cls
>> byte_shift
) & msk
);
758 if (strncmp(buf
, &hwid
->id
[(i
- 1) * 2], 2))
764 static const struct acpi_device_id
*__acpi_match_device(
765 struct acpi_device
*device
,
766 const struct acpi_device_id
*ids
,
767 const struct of_device_id
*of_ids
)
769 const struct acpi_device_id
*id
;
770 struct acpi_hardware_id
*hwid
;
773 * If the device is not present, it is unnecessary to load device
776 if (!device
|| !device
->status
.present
)
779 list_for_each_entry(hwid
, &device
->pnp
.ids
, list
) {
780 /* First, check the ACPI/PNP IDs provided by the caller. */
781 for (id
= ids
; id
->id
[0] || id
->cls
; id
++) {
782 if (id
->id
[0] && !strcmp((char *) id
->id
, hwid
->id
))
784 else if (id
->cls
&& __acpi_match_device_cls(id
, hwid
))
789 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
790 * "compatible" property if found.
792 * The id returned by the below is not valid, but the only
793 * caller passing non-NULL of_ids here is only interested in
794 * whether or not the return value is NULL.
796 if (!strcmp(ACPI_DT_NAMESPACE_HID
, hwid
->id
)
797 && acpi_of_match_device(device
, of_ids
))
804 * acpi_match_device - Match a struct device against a given list of ACPI IDs
805 * @ids: Array of struct acpi_device_id object to match against.
806 * @dev: The device structure to match.
808 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
809 * object for that handle and use that object to match against a given list of
812 * Return a pointer to the first matching ID on success or %NULL on failure.
814 const struct acpi_device_id
*acpi_match_device(const struct acpi_device_id
*ids
,
815 const struct device
*dev
)
817 return __acpi_match_device(acpi_companion_match(dev
), ids
, NULL
);
819 EXPORT_SYMBOL_GPL(acpi_match_device
);
821 int acpi_match_device_ids(struct acpi_device
*device
,
822 const struct acpi_device_id
*ids
)
824 return __acpi_match_device(device
, ids
, NULL
) ? 0 : -ENOENT
;
826 EXPORT_SYMBOL(acpi_match_device_ids
);
828 bool acpi_driver_match_device(struct device
*dev
,
829 const struct device_driver
*drv
)
831 if (!drv
->acpi_match_table
)
832 return acpi_of_match_device(ACPI_COMPANION(dev
),
833 drv
->of_match_table
);
835 return !!__acpi_match_device(acpi_companion_match(dev
),
836 drv
->acpi_match_table
, drv
->of_match_table
);
838 EXPORT_SYMBOL_GPL(acpi_driver_match_device
);
840 /* --------------------------------------------------------------------------
841 ACPI Driver Management
842 -------------------------------------------------------------------------- */
845 * acpi_bus_register_driver - register a driver with the ACPI bus
846 * @driver: driver being registered
848 * Registers a driver with the ACPI bus. Searches the namespace for all
849 * devices that match the driver's criteria and binds. Returns zero for
850 * success or a negative error status for failure.
852 int acpi_bus_register_driver(struct acpi_driver
*driver
)
858 driver
->drv
.name
= driver
->name
;
859 driver
->drv
.bus
= &acpi_bus_type
;
860 driver
->drv
.owner
= driver
->owner
;
862 ret
= driver_register(&driver
->drv
);
866 EXPORT_SYMBOL(acpi_bus_register_driver
);
869 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
870 * @driver: driver to unregister
872 * Unregisters a driver with the ACPI bus. Searches the namespace for all
873 * devices that match the driver's criteria and unbinds.
875 void acpi_bus_unregister_driver(struct acpi_driver
*driver
)
877 driver_unregister(&driver
->drv
);
880 EXPORT_SYMBOL(acpi_bus_unregister_driver
);
882 /* --------------------------------------------------------------------------
884 -------------------------------------------------------------------------- */
886 static int acpi_bus_match(struct device
*dev
, struct device_driver
*drv
)
888 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
889 struct acpi_driver
*acpi_drv
= to_acpi_driver(drv
);
891 return acpi_dev
->flags
.match_driver
892 && !acpi_match_device_ids(acpi_dev
, acpi_drv
->ids
);
895 static int acpi_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
897 return __acpi_device_uevent_modalias(to_acpi_device(dev
), env
);
900 static int acpi_device_probe(struct device
*dev
)
902 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
903 struct acpi_driver
*acpi_drv
= to_acpi_driver(dev
->driver
);
906 if (acpi_dev
->handler
&& !acpi_is_pnp_device(acpi_dev
))
909 if (!acpi_drv
->ops
.add
)
912 ret
= acpi_drv
->ops
.add(acpi_dev
);
916 acpi_dev
->driver
= acpi_drv
;
917 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
918 "Driver [%s] successfully bound to device [%s]\n",
919 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
921 if (acpi_drv
->ops
.notify
) {
922 ret
= acpi_device_install_notify_handler(acpi_dev
);
924 if (acpi_drv
->ops
.remove
)
925 acpi_drv
->ops
.remove(acpi_dev
);
927 acpi_dev
->driver
= NULL
;
928 acpi_dev
->driver_data
= NULL
;
933 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found driver [%s] for device [%s]\n",
934 acpi_drv
->name
, acpi_dev
->pnp
.bus_id
));
939 static int acpi_device_remove(struct device
* dev
)
941 struct acpi_device
*acpi_dev
= to_acpi_device(dev
);
942 struct acpi_driver
*acpi_drv
= acpi_dev
->driver
;
945 if (acpi_drv
->ops
.notify
)
946 acpi_device_remove_notify_handler(acpi_dev
);
947 if (acpi_drv
->ops
.remove
)
948 acpi_drv
->ops
.remove(acpi_dev
);
950 acpi_dev
->driver
= NULL
;
951 acpi_dev
->driver_data
= NULL
;
957 struct bus_type acpi_bus_type
= {
959 .match
= acpi_bus_match
,
960 .probe
= acpi_device_probe
,
961 .remove
= acpi_device_remove
,
962 .uevent
= acpi_device_uevent
,
965 /* --------------------------------------------------------------------------
966 Initialization/Cleanup
967 -------------------------------------------------------------------------- */
969 static int __init
acpi_bus_init_irq(void)
972 char *message
= NULL
;
976 * Let the system know what interrupt model we are using by
977 * evaluating the \_PIC object, if exists.
980 switch (acpi_irq_model
) {
981 case ACPI_IRQ_MODEL_PIC
:
984 case ACPI_IRQ_MODEL_IOAPIC
:
987 case ACPI_IRQ_MODEL_IOSAPIC
:
990 case ACPI_IRQ_MODEL_GIC
:
993 case ACPI_IRQ_MODEL_PLATFORM
:
994 message
= "platform specific model";
997 printk(KERN_WARNING PREFIX
"Unknown interrupt routing model\n");
1001 printk(KERN_INFO PREFIX
"Using %s for interrupt routing\n", message
);
1003 status
= acpi_execute_simple_method(NULL
, "\\_PIC", acpi_irq_model
);
1004 if (ACPI_FAILURE(status
) && (status
!= AE_NOT_FOUND
)) {
1005 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PIC"));
1013 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1015 * The ACPI tables are accessible after this, but the handling of events has not
1016 * been initialized and the global lock is not available yet, so AML should not
1017 * be executed at this point.
1019 * Doing this before switching the EFI runtime services to virtual mode allows
1020 * the EfiBootServices memory to be freed slightly earlier on boot.
1022 void __init
acpi_early_init(void)
1029 printk(KERN_INFO PREFIX
"Core revision %08x\n", ACPI_CA_VERSION
);
1031 /* enable workarounds, unless strict ACPI spec. compliance */
1033 acpi_gbl_enable_interpreter_slack
= TRUE
;
1035 acpi_permanent_mmap
= true;
1037 /* Check machine-specific quirks */
1038 dmi_check_system(acpi_quirks_dmi_table
);
1040 status
= acpi_reallocate_root_table();
1041 if (ACPI_FAILURE(status
)) {
1042 printk(KERN_ERR PREFIX
1043 "Unable to reallocate ACPI tables\n");
1047 status
= acpi_initialize_subsystem();
1048 if (ACPI_FAILURE(status
)) {
1049 printk(KERN_ERR PREFIX
1050 "Unable to initialize the ACPI Interpreter\n");
1054 if (!acpi_gbl_parse_table_as_term_list
&&
1055 acpi_gbl_group_module_level_code
) {
1056 status
= acpi_load_tables();
1057 if (ACPI_FAILURE(status
)) {
1058 printk(KERN_ERR PREFIX
1059 "Unable to load the System Description Tables\n");
1066 /* compatible (0) means level (3) */
1067 if (!(acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
)) {
1068 acpi_sci_flags
&= ~ACPI_MADT_TRIGGER_MASK
;
1069 acpi_sci_flags
|= ACPI_MADT_TRIGGER_LEVEL
;
1071 /* Set PIC-mode SCI trigger type */
1072 acpi_pic_sci_set_trigger(acpi_gbl_FADT
.sci_interrupt
,
1073 (acpi_sci_flags
& ACPI_MADT_TRIGGER_MASK
) >> 2);
1076 * now that acpi_gbl_FADT is initialized,
1077 * update it with result from INT_SRC_OVR parsing
1079 acpi_gbl_FADT
.sci_interrupt
= acpi_sci_override_gsi
;
1089 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1091 * Switch over the platform to the ACPI mode (if possible).
1093 * Doing this too early is generally unsafe, but at the same time it needs to be
1094 * done before all things that really depend on ACPI. The right spot appears to
1095 * be before finalizing the EFI initialization.
1097 void __init
acpi_subsystem_init(void)
1104 status
= acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE
);
1105 if (ACPI_FAILURE(status
)) {
1106 printk(KERN_ERR PREFIX
"Unable to enable ACPI\n");
1110 * If the system is using ACPI then we can be reasonably
1111 * confident that any regulators are managed by the firmware
1112 * so tell the regulator core it has everything it needs to
1115 regulator_has_full_constraints();
1119 static acpi_status
acpi_bus_table_handler(u32 event
, void *table
, void *context
)
1121 acpi_scan_table_handler(event
, table
, context
);
1123 return acpi_sysfs_table_handler(event
, table
, context
);
1126 static int __init
acpi_bus_init(void)
1131 acpi_os_initialize1();
1134 * ACPI 2.0 requires the EC driver to be loaded and work before
1135 * the EC device is found in the namespace (i.e. before
1136 * acpi_load_tables() is called).
1138 * This is accomplished by looking for the ECDT table, and getting
1139 * the EC parameters out of that.
1141 status
= acpi_ec_ecdt_probe();
1142 /* Ignore result. Not having an ECDT is not fatal. */
1144 if (acpi_gbl_parse_table_as_term_list
||
1145 !acpi_gbl_group_module_level_code
) {
1146 status
= acpi_load_tables();
1147 if (ACPI_FAILURE(status
)) {
1148 printk(KERN_ERR PREFIX
1149 "Unable to load the System Description Tables\n");
1154 status
= acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE
);
1155 if (ACPI_FAILURE(status
)) {
1156 printk(KERN_ERR PREFIX
1157 "Unable to start the ACPI Interpreter\n");
1161 status
= acpi_initialize_objects(ACPI_FULL_INITIALIZATION
);
1162 if (ACPI_FAILURE(status
)) {
1163 printk(KERN_ERR PREFIX
"Unable to initialize ACPI objects\n");
1167 /* Set capability bits for _OSC under processor scope */
1168 acpi_early_processor_osc();
1171 * _OSC method may exist in module level code,
1172 * so it must be run after ACPI_FULL_INITIALIZATION
1174 acpi_bus_osc_support();
1177 * _PDC control method may load dynamic SSDT tables,
1178 * and we need to install the table handler before that.
1180 status
= acpi_install_table_handler(acpi_bus_table_handler
, NULL
);
1184 acpi_early_processor_set_pdc();
1187 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1188 * is necessary to enable it as early as possible.
1190 acpi_ec_dsdt_probe();
1192 printk(KERN_INFO PREFIX
"Interpreter enabled\n");
1194 /* Initialize sleep structures */
1198 * Get the system interrupt model and evaluate \_PIC.
1200 result
= acpi_bus_init_irq();
1205 * Register the for all standard device notifications.
1208 acpi_install_notify_handler(ACPI_ROOT_OBJECT
, ACPI_SYSTEM_NOTIFY
,
1209 &acpi_bus_notify
, NULL
);
1210 if (ACPI_FAILURE(status
)) {
1211 printk(KERN_ERR PREFIX
1212 "Unable to register for device notifications\n");
1217 * Create the top ACPI proc directory
1219 acpi_root_dir
= proc_mkdir(ACPI_BUS_FILE_ROOT
, NULL
);
1221 result
= bus_register(&acpi_bus_type
);
1225 /* Mimic structured exception handling */
1231 struct kobject
*acpi_kobj
;
1232 EXPORT_SYMBOL_GPL(acpi_kobj
);
1234 static int __init
acpi_init(void)
1238 if (acpi_disabled
) {
1239 printk(KERN_INFO PREFIX
"Interpreter disabled.\n");
1243 acpi_kobj
= kobject_create_and_add("acpi", firmware_kobj
);
1245 printk(KERN_WARNING
"%s: kset create error\n", __func__
);
1249 init_acpi_device_notify();
1250 result
= acpi_bus_init();
1256 pci_mmcfg_late_init();
1260 acpi_debugfs_init();
1261 acpi_sleep_proc_init();
1262 acpi_wakeup_device_init();
1263 acpi_debugger_init();
1264 acpi_setup_sb_notify_handler();
1268 subsys_initcall(acpi_init
);