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;
138 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
140 int acpi_bus_get_status(struct acpi_device *device)
143 unsigned long long sta;
145 if (acpi_device_always_present(device)) {
146 acpi_set_device_status(device, ACPI_STA_DEFAULT);
150 /* Battery devices must have their deps met before calling _STA */
151 if (acpi_device_is_battery(device) && device->dep_unmet) {
152 acpi_set_device_status(device, 0);
156 status = acpi_bus_get_status_handle(device->handle, &sta);
157 if (ACPI_FAILURE(status))
160 acpi_set_device_status(device, sta);
162 if (device->status.functional && !device->status.present) {
163 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
164 "functional but not present;\n",
165 device->pnp.bus_id, (u32)sta));
168 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
169 device->pnp.bus_id, (u32)sta));
172 EXPORT_SYMBOL(acpi_bus_get_status);
174 void acpi_bus_private_data_handler(acpi_handle handle,
179 EXPORT_SYMBOL(acpi_bus_private_data_handler);
181 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
185 status = acpi_attach_data(handle,
186 acpi_bus_private_data_handler, data);
187 if (ACPI_FAILURE(status)) {
188 acpi_handle_debug(handle, "Error attaching device data\n");
194 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
196 int acpi_bus_get_private_data(acpi_handle handle, void **data)
203 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
204 if (ACPI_FAILURE(status)) {
205 acpi_handle_debug(handle, "No context for object\n");
211 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
213 void acpi_bus_detach_private_data(acpi_handle handle)
215 acpi_detach_data(handle, acpi_bus_private_data_handler);
217 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
219 static void acpi_print_osc_error(acpi_handle handle,
220 struct acpi_osc_context *context, char *error)
224 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
226 pr_debug("_OSC request data:");
227 for (i = 0; i < context->cap.length; i += sizeof(u32))
228 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
233 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
236 struct acpi_object_list input;
237 union acpi_object in_params[4];
238 union acpi_object *out_obj;
241 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
245 if (guid_parse(context->uuid_str, &guid))
247 context->ret.length = ACPI_ALLOCATE_BUFFER;
248 context->ret.pointer = NULL;
250 /* Setting up input parameters */
252 input.pointer = in_params;
253 in_params[0].type = ACPI_TYPE_BUFFER;
254 in_params[0].buffer.length = 16;
255 in_params[0].buffer.pointer = (u8 *)&guid;
256 in_params[1].type = ACPI_TYPE_INTEGER;
257 in_params[1].integer.value = context->rev;
258 in_params[2].type = ACPI_TYPE_INTEGER;
259 in_params[2].integer.value = context->cap.length/sizeof(u32);
260 in_params[3].type = ACPI_TYPE_BUFFER;
261 in_params[3].buffer.length = context->cap.length;
262 in_params[3].buffer.pointer = context->cap.pointer;
264 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
265 if (ACPI_FAILURE(status))
269 return AE_NULL_OBJECT;
271 out_obj = output.pointer;
272 if (out_obj->type != ACPI_TYPE_BUFFER
273 || out_obj->buffer.length != context->cap.length) {
274 acpi_print_osc_error(handle, context,
275 "_OSC evaluation returned wrong type");
279 /* Need to ignore the bit0 in result code */
280 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
282 if (errors & OSC_REQUEST_ERROR)
283 acpi_print_osc_error(handle, context,
284 "_OSC request failed");
285 if (errors & OSC_INVALID_UUID_ERROR)
286 acpi_print_osc_error(handle, context,
287 "_OSC invalid UUID");
288 if (errors & OSC_INVALID_REVISION_ERROR)
289 acpi_print_osc_error(handle, context,
290 "_OSC invalid revision");
291 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
292 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
302 context->ret.length = out_obj->buffer.length;
303 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
304 context->ret.length, GFP_KERNEL);
305 if (!context->ret.pointer) {
306 status = AE_NO_MEMORY;
312 kfree(output.pointer);
314 context->ret.pointer = NULL;
317 EXPORT_SYMBOL(acpi_run_osc);
319 bool osc_sb_apei_support_acked;
322 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
323 * OSPM supports platform coordinated low power idle(LPI) states
325 bool osc_pc_lpi_support_confirmed;
326 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
328 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
329 static void acpi_bus_osc_support(void)
332 struct acpi_osc_context context = {
333 .uuid_str = sb_uuid_str,
336 .cap.pointer = capbuf,
340 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
341 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
342 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
343 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
344 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
347 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
351 if (boot_cpu_has(X86_FEATURE_HWP)) {
352 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
353 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
357 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
358 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
361 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
362 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
364 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
365 u32 *capbuf_ret = context.ret.pointer;
366 if (context.ret.length > OSC_SUPPORT_DWORD) {
367 osc_sb_apei_support_acked =
368 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
369 osc_pc_lpi_support_confirmed =
370 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
372 kfree(context.ret.pointer);
374 /* do we need to check other returned cap? Sounds no */
377 /* --------------------------------------------------------------------------
378 Notification Handling
379 -------------------------------------------------------------------------- */
384 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
386 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
388 struct acpi_device *adev;
389 struct acpi_driver *driver;
390 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
391 bool hotplug_event = false;
394 case ACPI_NOTIFY_BUS_CHECK:
395 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
396 hotplug_event = true;
399 case ACPI_NOTIFY_DEVICE_CHECK:
400 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
401 hotplug_event = true;
404 case ACPI_NOTIFY_DEVICE_WAKE:
405 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
408 case ACPI_NOTIFY_EJECT_REQUEST:
409 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
410 hotplug_event = true;
413 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
414 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
415 /* TBD: Exactly what does 'light' mean? */
418 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
419 acpi_handle_err(handle, "Device cannot be configured due "
420 "to a frequency mismatch\n");
423 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
424 acpi_handle_err(handle, "Device cannot be configured due "
425 "to a bus mode mismatch\n");
428 case ACPI_NOTIFY_POWER_FAULT:
429 acpi_handle_err(handle, "Device has suffered a power fault\n");
433 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
437 adev = acpi_bus_get_acpi_device(handle);
441 driver = adev->driver;
442 if (driver && driver->ops.notify &&
443 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
444 driver->ops.notify(adev, type);
446 if (!hotplug_event) {
447 acpi_bus_put_acpi_device(adev);
451 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
454 acpi_bus_put_acpi_device(adev);
457 acpi_evaluate_ost(handle, type, ost_code, NULL);
460 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
462 struct acpi_device *device = data;
464 device->driver->ops.notify(device, event);
467 static void acpi_device_notify_fixed(void *data)
469 struct acpi_device *device = data;
471 /* Fixed hardware devices have no handles */
472 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
475 static u32 acpi_device_fixed_event(void *data)
477 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
478 return ACPI_INTERRUPT_HANDLED;
481 static int acpi_device_install_notify_handler(struct acpi_device *device)
485 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
487 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
488 acpi_device_fixed_event,
490 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
492 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
493 acpi_device_fixed_event,
496 status = acpi_install_notify_handler(device->handle,
501 if (ACPI_FAILURE(status))
506 static void acpi_device_remove_notify_handler(struct acpi_device *device)
508 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
509 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
510 acpi_device_fixed_event);
511 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
512 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
513 acpi_device_fixed_event);
515 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
519 /* Handle events targeting \_SB device (at present only graceful shutdown) */
521 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
522 #define ACPI_SB_INDICATE_INTERVAL 10000
524 static void sb_notify_work(struct work_struct *dummy)
526 acpi_handle sb_handle;
528 orderly_poweroff(true);
531 * After initiating graceful shutdown, the ACPI spec requires OSPM
532 * to evaluate _OST method once every 10seconds to indicate that
533 * the shutdown is in progress
535 acpi_get_handle(NULL, "\\_SB", &sb_handle);
537 pr_info("Graceful shutdown in progress.\n");
538 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
539 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
540 msleep(ACPI_SB_INDICATE_INTERVAL);
544 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
546 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
548 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
549 if (!work_busy(&acpi_sb_work))
550 schedule_work(&acpi_sb_work);
552 pr_warn("event %x is not supported by \\_SB device\n", event);
555 static int __init acpi_setup_sb_notify_handler(void)
557 acpi_handle sb_handle;
559 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
562 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
563 acpi_sb_notify, NULL)))
569 /* --------------------------------------------------------------------------
571 -------------------------------------------------------------------------- */
574 * acpi_get_first_physical_node - Get first physical node of an ACPI device
575 * @adev: ACPI device in question
577 * Return: First physical node of ACPI device @adev
579 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
581 struct mutex *physical_node_lock = &adev->physical_node_lock;
582 struct device *phys_dev;
584 mutex_lock(physical_node_lock);
585 if (list_empty(&adev->physical_node_list)) {
588 const struct acpi_device_physical_node *node;
590 node = list_first_entry(&adev->physical_node_list,
591 struct acpi_device_physical_node, node);
593 phys_dev = node->dev;
595 mutex_unlock(physical_node_lock);
599 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
600 const struct device *dev)
602 const struct device *phys_dev = acpi_get_first_physical_node(adev);
604 return phys_dev && phys_dev == dev ? adev : NULL;
608 * acpi_device_is_first_physical_node - Is given dev first physical node
609 * @adev: ACPI companion device
610 * @dev: Physical device to check
612 * Function checks if given @dev is the first physical devices attached to
613 * the ACPI companion device. This distinction is needed in some cases
614 * where the same companion device is shared between many physical devices.
616 * Note that the caller have to provide valid @adev pointer.
618 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
619 const struct device *dev)
621 return !!acpi_primary_dev_companion(adev, dev);
625 * acpi_companion_match() - Can we match via ACPI companion device
626 * @dev: Device in question
628 * Check if the given device has an ACPI companion and if that companion has
629 * a valid list of PNP IDs, and if the device is the first (primary) physical
630 * device associated with it. Return the companion pointer if that's the case
633 * If multiple physical devices are attached to a single ACPI companion, we need
634 * to be careful. The usage scenario for this kind of relationship is that all
635 * of the physical devices in question use resources provided by the ACPI
636 * companion. A typical case is an MFD device where all the sub-devices share
637 * the parent's ACPI companion. In such cases we can only allow the primary
638 * (first) physical device to be matched with the help of the companion's PNP
641 * Additional physical devices sharing the ACPI companion can still use
642 * resources available from it but they will be matched normally using functions
643 * provided by their bus types (and analogously for their modalias).
645 struct acpi_device *acpi_companion_match(const struct device *dev)
647 struct acpi_device *adev;
649 adev = ACPI_COMPANION(dev);
653 if (list_empty(&adev->pnp.ids))
656 return acpi_primary_dev_companion(adev, dev);
660 * acpi_of_match_device - Match device object using the "compatible" property.
661 * @adev: ACPI device object to match.
662 * @of_match_table: List of device IDs to match against.
664 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
665 * identifiers and a _DSD object with the "compatible" property, use that
666 * property to match against the given list of identifiers.
668 static bool acpi_of_match_device(struct acpi_device *adev,
669 const struct of_device_id *of_match_table)
671 const union acpi_object *of_compatible, *obj;
677 of_compatible = adev->data.of_compatible;
678 if (!of_match_table || !of_compatible)
681 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
682 nval = of_compatible->package.count;
683 obj = of_compatible->package.elements;
684 } else { /* Must be ACPI_TYPE_STRING. */
688 /* Now we can look for the driver DT compatible strings */
689 for (i = 0; i < nval; i++, obj++) {
690 const struct of_device_id *id;
692 for (id = of_match_table; id->compatible[0]; id++)
693 if (!strcasecmp(obj->string.pointer, id->compatible))
700 static bool acpi_of_modalias(struct acpi_device *adev,
701 char *modalias, size_t len)
703 const union acpi_object *of_compatible;
704 const union acpi_object *obj;
705 const char *str, *chr;
707 of_compatible = adev->data.of_compatible;
711 if (of_compatible->type == ACPI_TYPE_PACKAGE)
712 obj = of_compatible->package.elements;
713 else /* Must be ACPI_TYPE_STRING. */
716 str = obj->string.pointer;
717 chr = strchr(str, ',');
718 strlcpy(modalias, chr ? chr + 1 : str, len);
724 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
725 * @adev: ACPI device object to match
726 * @default_id: ID string to use as default if no compatible string found
727 * @modalias: Pointer to buffer that modalias value will be copied into
728 * @len: Length of modalias buffer
730 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
731 * If there is a compatible string for @adev, it will be copied to @modalias
732 * with the vendor prefix stripped; otherwise, @default_id will be used.
734 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
735 char *modalias, size_t len)
737 if (!acpi_of_modalias(adev, modalias, len))
738 strlcpy(modalias, default_id, len);
740 EXPORT_SYMBOL_GPL(acpi_set_modalias);
742 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
743 struct acpi_hardware_id *hwid)
745 int i, msk, byte_shift;
751 /* Apply class-code bitmask, before checking each class-code byte */
752 for (i = 1; i <= 3; i++) {
753 byte_shift = 8 * (3 - i);
754 msk = (id->cls_msk >> byte_shift) & 0xFF;
758 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
759 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
765 static const struct acpi_device_id *__acpi_match_device(
766 struct acpi_device *device,
767 const struct acpi_device_id *ids,
768 const struct of_device_id *of_ids)
770 const struct acpi_device_id *id;
771 struct acpi_hardware_id *hwid;
774 * If the device is not present, it is unnecessary to load device
777 if (!device || !device->status.present)
780 list_for_each_entry(hwid, &device->pnp.ids, list) {
781 /* First, check the ACPI/PNP IDs provided by the caller. */
782 for (id = ids; id->id[0] || id->cls; id++) {
783 if (id->id[0] && !strcmp((char *) id->id, hwid->id))
785 else if (id->cls && __acpi_match_device_cls(id, hwid))
790 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
791 * "compatible" property if found.
793 * The id returned by the below is not valid, but the only
794 * caller passing non-NULL of_ids here is only interested in
795 * whether or not the return value is NULL.
797 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
798 && acpi_of_match_device(device, of_ids))
805 * acpi_match_device - Match a struct device against a given list of ACPI IDs
806 * @ids: Array of struct acpi_device_id object to match against.
807 * @dev: The device structure to match.
809 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
810 * object for that handle and use that object to match against a given list of
813 * Return a pointer to the first matching ID on success or %NULL on failure.
815 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
816 const struct device *dev)
818 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
820 EXPORT_SYMBOL_GPL(acpi_match_device);
822 void *acpi_get_match_data(const struct device *dev)
824 const struct acpi_device_id *match;
829 if (!dev->driver->acpi_match_table)
832 match = acpi_match_device(dev->driver->acpi_match_table, dev);
836 return (void *)match->driver_data;
838 EXPORT_SYMBOL_GPL(acpi_get_match_data);
840 int acpi_match_device_ids(struct acpi_device *device,
841 const struct acpi_device_id *ids)
843 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
845 EXPORT_SYMBOL(acpi_match_device_ids);
847 bool acpi_driver_match_device(struct device *dev,
848 const struct device_driver *drv)
850 if (!drv->acpi_match_table)
851 return acpi_of_match_device(ACPI_COMPANION(dev),
852 drv->of_match_table);
854 return !!__acpi_match_device(acpi_companion_match(dev),
855 drv->acpi_match_table, drv->of_match_table);
857 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
859 /* --------------------------------------------------------------------------
860 ACPI Driver Management
861 -------------------------------------------------------------------------- */
864 * acpi_bus_register_driver - register a driver with the ACPI bus
865 * @driver: driver being registered
867 * Registers a driver with the ACPI bus. Searches the namespace for all
868 * devices that match the driver's criteria and binds. Returns zero for
869 * success or a negative error status for failure.
871 int acpi_bus_register_driver(struct acpi_driver *driver)
877 driver->drv.name = driver->name;
878 driver->drv.bus = &acpi_bus_type;
879 driver->drv.owner = driver->owner;
881 ret = driver_register(&driver->drv);
885 EXPORT_SYMBOL(acpi_bus_register_driver);
888 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
889 * @driver: driver to unregister
891 * Unregisters a driver with the ACPI bus. Searches the namespace for all
892 * devices that match the driver's criteria and unbinds.
894 void acpi_bus_unregister_driver(struct acpi_driver *driver)
896 driver_unregister(&driver->drv);
899 EXPORT_SYMBOL(acpi_bus_unregister_driver);
901 /* --------------------------------------------------------------------------
903 -------------------------------------------------------------------------- */
905 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
907 struct acpi_device *acpi_dev = to_acpi_device(dev);
908 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
910 return acpi_dev->flags.match_driver
911 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
914 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
916 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
919 static int acpi_device_probe(struct device *dev)
921 struct acpi_device *acpi_dev = to_acpi_device(dev);
922 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
925 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
928 if (!acpi_drv->ops.add)
931 ret = acpi_drv->ops.add(acpi_dev);
935 acpi_dev->driver = acpi_drv;
936 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
937 "Driver [%s] successfully bound to device [%s]\n",
938 acpi_drv->name, acpi_dev->pnp.bus_id));
940 if (acpi_drv->ops.notify) {
941 ret = acpi_device_install_notify_handler(acpi_dev);
943 if (acpi_drv->ops.remove)
944 acpi_drv->ops.remove(acpi_dev);
946 acpi_dev->driver = NULL;
947 acpi_dev->driver_data = NULL;
952 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
953 acpi_drv->name, acpi_dev->pnp.bus_id));
958 static int acpi_device_remove(struct device * dev)
960 struct acpi_device *acpi_dev = to_acpi_device(dev);
961 struct acpi_driver *acpi_drv = acpi_dev->driver;
964 if (acpi_drv->ops.notify)
965 acpi_device_remove_notify_handler(acpi_dev);
966 if (acpi_drv->ops.remove)
967 acpi_drv->ops.remove(acpi_dev);
969 acpi_dev->driver = NULL;
970 acpi_dev->driver_data = NULL;
976 struct bus_type acpi_bus_type = {
978 .match = acpi_bus_match,
979 .probe = acpi_device_probe,
980 .remove = acpi_device_remove,
981 .uevent = acpi_device_uevent,
984 /* --------------------------------------------------------------------------
985 Initialization/Cleanup
986 -------------------------------------------------------------------------- */
988 static int __init acpi_bus_init_irq(void)
991 char *message = NULL;
995 * Let the system know what interrupt model we are using by
996 * evaluating the \_PIC object, if exists.
999 switch (acpi_irq_model) {
1000 case ACPI_IRQ_MODEL_PIC:
1003 case ACPI_IRQ_MODEL_IOAPIC:
1006 case ACPI_IRQ_MODEL_IOSAPIC:
1007 message = "IOSAPIC";
1009 case ACPI_IRQ_MODEL_GIC:
1012 case ACPI_IRQ_MODEL_PLATFORM:
1013 message = "platform specific model";
1016 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
1020 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
1022 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1023 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1024 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1032 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1034 * The ACPI tables are accessible after this, but the handling of events has not
1035 * been initialized and the global lock is not available yet, so AML should not
1036 * be executed at this point.
1038 * Doing this before switching the EFI runtime services to virtual mode allows
1039 * the EfiBootServices memory to be freed slightly earlier on boot.
1041 void __init acpi_early_init(void)
1048 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1050 /* enable workarounds, unless strict ACPI spec. compliance */
1052 acpi_gbl_enable_interpreter_slack = TRUE;
1054 acpi_permanent_mmap = true;
1056 /* Check machine-specific quirks */
1057 dmi_check_system(acpi_quirks_dmi_table);
1059 status = acpi_reallocate_root_table();
1060 if (ACPI_FAILURE(status)) {
1061 printk(KERN_ERR PREFIX
1062 "Unable to reallocate ACPI tables\n");
1066 status = acpi_initialize_subsystem();
1067 if (ACPI_FAILURE(status)) {
1068 printk(KERN_ERR PREFIX
1069 "Unable to initialize the ACPI Interpreter\n");
1073 if (!acpi_gbl_parse_table_as_term_list &&
1074 acpi_gbl_group_module_level_code) {
1075 status = acpi_load_tables();
1076 if (ACPI_FAILURE(status)) {
1077 printk(KERN_ERR PREFIX
1078 "Unable to load the System Description Tables\n");
1085 /* compatible (0) means level (3) */
1086 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1087 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1088 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1090 /* Set PIC-mode SCI trigger type */
1091 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1092 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1095 * now that acpi_gbl_FADT is initialized,
1096 * update it with result from INT_SRC_OVR parsing
1098 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1108 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1110 * Switch over the platform to the ACPI mode (if possible).
1112 * Doing this too early is generally unsafe, but at the same time it needs to be
1113 * done before all things that really depend on ACPI. The right spot appears to
1114 * be before finalizing the EFI initialization.
1116 void __init acpi_subsystem_init(void)
1123 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1124 if (ACPI_FAILURE(status)) {
1125 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1129 * If the system is using ACPI then we can be reasonably
1130 * confident that any regulators are managed by the firmware
1131 * so tell the regulator core it has everything it needs to
1134 regulator_has_full_constraints();
1138 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1140 acpi_scan_table_handler(event, table, context);
1142 return acpi_sysfs_table_handler(event, table, context);
1145 static int __init acpi_bus_init(void)
1150 acpi_os_initialize1();
1153 * ACPI 2.0 requires the EC driver to be loaded and work before
1154 * the EC device is found in the namespace (i.e. before
1155 * acpi_load_tables() is called).
1157 * This is accomplished by looking for the ECDT table, and getting
1158 * the EC parameters out of that.
1160 status = acpi_ec_ecdt_probe();
1161 /* Ignore result. Not having an ECDT is not fatal. */
1163 if (acpi_gbl_parse_table_as_term_list ||
1164 !acpi_gbl_group_module_level_code) {
1165 status = acpi_load_tables();
1166 if (ACPI_FAILURE(status)) {
1167 printk(KERN_ERR PREFIX
1168 "Unable to load the System Description Tables\n");
1173 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1174 if (ACPI_FAILURE(status)) {
1175 printk(KERN_ERR PREFIX
1176 "Unable to start the ACPI Interpreter\n");
1180 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1181 if (ACPI_FAILURE(status)) {
1182 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1186 /* Set capability bits for _OSC under processor scope */
1187 acpi_early_processor_osc();
1190 * _OSC method may exist in module level code,
1191 * so it must be run after ACPI_FULL_INITIALIZATION
1193 acpi_bus_osc_support();
1196 * _PDC control method may load dynamic SSDT tables,
1197 * and we need to install the table handler before that.
1199 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1203 acpi_early_processor_set_pdc();
1206 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1207 * is necessary to enable it as early as possible.
1209 acpi_ec_dsdt_probe();
1211 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1213 /* Initialize sleep structures */
1217 * Get the system interrupt model and evaluate \_PIC.
1219 result = acpi_bus_init_irq();
1224 * Register the for all standard device notifications.
1227 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1228 &acpi_bus_notify, NULL);
1229 if (ACPI_FAILURE(status)) {
1230 printk(KERN_ERR PREFIX
1231 "Unable to register for device notifications\n");
1236 * Create the top ACPI proc directory
1238 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1240 result = bus_register(&acpi_bus_type);
1244 /* Mimic structured exception handling */
1250 struct kobject *acpi_kobj;
1251 EXPORT_SYMBOL_GPL(acpi_kobj);
1253 static int __init acpi_init(void)
1257 if (acpi_disabled) {
1258 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1262 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1264 printk(KERN_WARNING "%s: kset create error\n", __func__);
1268 init_acpi_device_notify();
1269 result = acpi_bus_init();
1275 pci_mmcfg_late_init();
1279 acpi_debugfs_init();
1280 acpi_sleep_proc_init();
1281 acpi_wakeup_device_init();
1282 acpi_debugger_init();
1283 acpi_setup_sb_notify_handler();
1287 subsys_initcall(acpi_init);