1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 #define pr_fmt(fmt) "ACPI: " fmt
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/ioport.h>
13 #include <linux/kernel.h>
14 #include <linux/list.h>
15 #include <linux/sched.h>
17 #include <linux/device.h>
18 #include <linux/proc_fs.h>
19 #include <linux/acpi.h>
20 #include <linux/slab.h>
21 #include <linux/regulator/machine.h>
22 #include <linux/workqueue.h>
23 #include <linux/reboot.h>
24 #include <linux/delay.h>
26 #include <asm/mpspec.h>
27 #include <linux/dmi.h>
29 #include <linux/acpi_viot.h>
30 #include <linux/pci.h>
31 #include <acpi/apei.h>
32 #include <linux/suspend.h>
33 #include <linux/prmt.h>
37 struct acpi_device *acpi_root;
38 struct proc_dir_entry *acpi_root_dir;
39 EXPORT_SYMBOL(acpi_root_dir);
42 #ifdef CONFIG_ACPI_CUSTOM_DSDT
43 static inline int set_copy_dsdt(const struct dmi_system_id *id)
48 static int set_copy_dsdt(const struct dmi_system_id *id)
50 pr_notice("%s detected - force copy of DSDT to local memory\n", id->ident);
51 acpi_gbl_copy_dsdt_locally = 1;
56 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
58 * Invoke DSDT corruption work-around on all Toshiba Satellite.
59 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
62 .callback = set_copy_dsdt,
63 .ident = "TOSHIBA Satellite",
65 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
66 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
73 /* --------------------------------------------------------------------------
75 -------------------------------------------------------------------------- */
77 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
78 unsigned long long *sta)
82 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
83 if (ACPI_SUCCESS(status))
86 if (status == AE_NOT_FOUND) {
87 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
88 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
93 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
95 int acpi_bus_get_status(struct acpi_device *device)
98 unsigned long long sta;
100 if (acpi_device_override_status(device, &sta)) {
101 acpi_set_device_status(device, sta);
105 /* Battery devices must have their deps met before calling _STA */
106 if (acpi_device_is_battery(device) && device->dep_unmet) {
107 acpi_set_device_status(device, 0);
111 status = acpi_bus_get_status_handle(device->handle, &sta);
112 if (ACPI_FAILURE(status))
115 acpi_set_device_status(device, sta);
117 if (device->status.functional && !device->status.present) {
118 pr_debug("Device [%s] status [%08x]: functional but not present\n",
119 device->pnp.bus_id, (u32)sta);
122 pr_debug("Device [%s] status [%08x]\n", device->pnp.bus_id, (u32)sta);
125 EXPORT_SYMBOL(acpi_bus_get_status);
127 void acpi_bus_private_data_handler(acpi_handle handle,
132 EXPORT_SYMBOL(acpi_bus_private_data_handler);
134 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
138 status = acpi_attach_data(handle,
139 acpi_bus_private_data_handler, data);
140 if (ACPI_FAILURE(status)) {
141 acpi_handle_debug(handle, "Error attaching device data\n");
147 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
149 int acpi_bus_get_private_data(acpi_handle handle, void **data)
156 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
157 if (ACPI_FAILURE(status)) {
158 acpi_handle_debug(handle, "No context for object\n");
164 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
166 void acpi_bus_detach_private_data(acpi_handle handle)
168 acpi_detach_data(handle, acpi_bus_private_data_handler);
170 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
172 static void acpi_print_osc_error(acpi_handle handle,
173 struct acpi_osc_context *context, char *error)
177 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
179 pr_debug("_OSC request data:");
180 for (i = 0; i < context->cap.length; i += sizeof(u32))
181 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
186 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
189 struct acpi_object_list input;
190 union acpi_object in_params[4];
191 union acpi_object *out_obj;
194 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
198 if (guid_parse(context->uuid_str, &guid))
200 context->ret.length = ACPI_ALLOCATE_BUFFER;
201 context->ret.pointer = NULL;
203 /* Setting up input parameters */
205 input.pointer = in_params;
206 in_params[0].type = ACPI_TYPE_BUFFER;
207 in_params[0].buffer.length = 16;
208 in_params[0].buffer.pointer = (u8 *)&guid;
209 in_params[1].type = ACPI_TYPE_INTEGER;
210 in_params[1].integer.value = context->rev;
211 in_params[2].type = ACPI_TYPE_INTEGER;
212 in_params[2].integer.value = context->cap.length/sizeof(u32);
213 in_params[3].type = ACPI_TYPE_BUFFER;
214 in_params[3].buffer.length = context->cap.length;
215 in_params[3].buffer.pointer = context->cap.pointer;
217 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
218 if (ACPI_FAILURE(status))
222 return AE_NULL_OBJECT;
224 out_obj = output.pointer;
225 if (out_obj->type != ACPI_TYPE_BUFFER
226 || out_obj->buffer.length != context->cap.length) {
227 acpi_print_osc_error(handle, context,
228 "_OSC evaluation returned wrong type");
232 /* Need to ignore the bit0 in result code */
233 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
235 if (errors & OSC_REQUEST_ERROR)
236 acpi_print_osc_error(handle, context,
237 "_OSC request failed");
238 if (errors & OSC_INVALID_UUID_ERROR)
239 acpi_print_osc_error(handle, context,
240 "_OSC invalid UUID");
241 if (errors & OSC_INVALID_REVISION_ERROR)
242 acpi_print_osc_error(handle, context,
243 "_OSC invalid revision");
244 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
245 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
255 context->ret.length = out_obj->buffer.length;
256 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
257 context->ret.length, GFP_KERNEL);
258 if (!context->ret.pointer) {
259 status = AE_NO_MEMORY;
265 kfree(output.pointer);
268 EXPORT_SYMBOL(acpi_run_osc);
270 bool osc_sb_apei_support_acked;
273 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
274 * OSPM supports platform coordinated low power idle(LPI) states
276 bool osc_pc_lpi_support_confirmed;
277 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
280 * ACPI 6.2 Section 6.2.11.2 'Platform-Wide OSPM Capabilities':
281 * Starting with ACPI Specification 6.2, all _CPC registers can be in
282 * PCC, System Memory, System IO, or Functional Fixed Hardware address
283 * spaces. OSPM support for this more flexible register space scheme is
284 * indicated by the “Flexible Address Space for CPPC Registers” _OSC bit.
286 * Otherwise (cf ACPI 6.1, s8.4.7.1.1.X), _CPC registers must be in:
287 * - PCC or Functional Fixed Hardware address space if defined
288 * - SystemMemory address space (NULL register) if not defined
290 bool osc_cpc_flexible_adr_space_confirmed;
291 EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
294 * ACPI 6.4 Operating System Capabilities for USB.
296 bool osc_sb_native_usb4_support_confirmed;
297 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
299 bool osc_sb_cppc2_support_acked;
301 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
302 static void acpi_bus_osc_negotiate_platform_control(void)
304 u32 capbuf[2], *capbuf_ret;
305 struct acpi_osc_context context = {
306 .uuid_str = sb_uuid_str,
309 .cap.pointer = capbuf,
313 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
314 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
315 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
316 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
317 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
318 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
321 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
322 if (IS_ENABLED(CONFIG_ACPI_PRMT))
323 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
324 if (IS_ENABLED(CONFIG_ACPI_FFH))
325 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FFH_OPR_SUPPORT;
328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
334 #ifdef CONFIG_ACPI_CPPC_LIB
335 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
339 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
341 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
342 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
344 if (IS_ENABLED(CONFIG_USB4))
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
349 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
352 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
355 capbuf_ret = context.ret.pointer;
356 if (context.ret.length <= OSC_SUPPORT_DWORD) {
357 kfree(context.ret.pointer);
362 * Now run _OSC again with query flag clear and with the caps
363 * supported by both the OS and the platform.
365 capbuf[OSC_QUERY_DWORD] = 0;
366 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
367 kfree(context.ret.pointer);
369 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
372 capbuf_ret = context.ret.pointer;
373 if (context.ret.length > OSC_SUPPORT_DWORD) {
374 #ifdef CONFIG_ACPI_CPPC_LIB
375 osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
378 osc_sb_apei_support_acked =
379 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
380 osc_pc_lpi_support_confirmed =
381 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
382 osc_sb_native_usb4_support_confirmed =
383 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
384 osc_cpc_flexible_adr_space_confirmed =
385 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE;
388 kfree(context.ret.pointer);
392 * Native control of USB4 capabilities. If any of the tunneling bits is
393 * set it means OS is in control and we use software based connection
396 u32 osc_sb_native_usb4_control;
397 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
399 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
401 pr_info("%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
402 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
403 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
404 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
405 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
408 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
409 static void acpi_bus_osc_negotiate_usb_control(void)
412 struct acpi_osc_context context = {
413 .uuid_str = sb_usb_uuid_str,
415 .cap.length = sizeof(capbuf),
416 .cap.pointer = capbuf,
422 if (!osc_sb_native_usb4_support_confirmed)
425 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
428 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
429 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
431 capbuf[OSC_QUERY_DWORD] = 0;
432 capbuf[OSC_SUPPORT_DWORD] = 0;
433 capbuf[OSC_CONTROL_DWORD] = control;
435 status = acpi_run_osc(handle, &context);
436 if (ACPI_FAILURE(status))
439 if (context.ret.length != sizeof(capbuf)) {
440 pr_info("USB4 _OSC: returned invalid length buffer\n");
444 osc_sb_native_usb4_control =
445 control & acpi_osc_ctx_get_pci_control(&context);
447 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
448 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
449 osc_sb_native_usb4_control);
452 kfree(context.ret.pointer);
455 /* --------------------------------------------------------------------------
456 Notification Handling
457 -------------------------------------------------------------------------- */
460 * acpi_bus_notify - Global system-level (0x00-0x7F) notifications handler
461 * @handle: Target ACPI object.
462 * @type: Notification type.
465 * This only handles notifications related to device hotplug.
467 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
469 struct acpi_device *adev;
472 case ACPI_NOTIFY_BUS_CHECK:
473 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
476 case ACPI_NOTIFY_DEVICE_CHECK:
477 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
480 case ACPI_NOTIFY_DEVICE_WAKE:
481 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
484 case ACPI_NOTIFY_EJECT_REQUEST:
485 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
488 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
489 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
490 /* TBD: Exactly what does 'light' mean? */
493 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
494 acpi_handle_err(handle, "Device cannot be configured due "
495 "to a frequency mismatch\n");
498 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
499 acpi_handle_err(handle, "Device cannot be configured due "
500 "to a bus mode mismatch\n");
503 case ACPI_NOTIFY_POWER_FAULT:
504 acpi_handle_err(handle, "Device has suffered a power fault\n");
508 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
512 adev = acpi_get_acpi_dev(handle);
514 if (adev && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
517 acpi_put_acpi_dev(adev);
519 acpi_evaluate_ost(handle, type, ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
522 static void acpi_notify_device(acpi_handle handle, u32 event, void *data)
524 struct acpi_device *device = data;
525 struct acpi_driver *acpi_drv = to_acpi_driver(device->dev.driver);
527 acpi_drv->ops.notify(device, event);
530 static int acpi_device_install_notify_handler(struct acpi_device *device,
531 struct acpi_driver *acpi_drv)
533 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
534 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
537 status = acpi_install_notify_handler(device->handle, type,
538 acpi_notify_device, device);
539 if (ACPI_FAILURE(status))
545 static void acpi_device_remove_notify_handler(struct acpi_device *device,
546 struct acpi_driver *acpi_drv)
548 u32 type = acpi_drv->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS ?
549 ACPI_ALL_NOTIFY : ACPI_DEVICE_NOTIFY;
551 acpi_remove_notify_handler(device->handle, type,
554 acpi_os_wait_events_complete();
557 /* Handle events targeting \_SB device (at present only graceful shutdown) */
559 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
560 #define ACPI_SB_INDICATE_INTERVAL 10000
562 static void sb_notify_work(struct work_struct *dummy)
564 acpi_handle sb_handle;
566 orderly_poweroff(true);
569 * After initiating graceful shutdown, the ACPI spec requires OSPM
570 * to evaluate _OST method once every 10seconds to indicate that
571 * the shutdown is in progress
573 acpi_get_handle(NULL, "\\_SB", &sb_handle);
575 pr_info("Graceful shutdown in progress.\n");
576 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
577 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
578 msleep(ACPI_SB_INDICATE_INTERVAL);
582 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
584 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
586 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
587 if (!work_busy(&acpi_sb_work))
588 schedule_work(&acpi_sb_work);
590 pr_warn("event %x is not supported by \\_SB device\n", event);
594 static int __init acpi_setup_sb_notify_handler(void)
596 acpi_handle sb_handle;
598 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
601 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
602 acpi_sb_notify, NULL)))
608 /* --------------------------------------------------------------------------
610 -------------------------------------------------------------------------- */
613 * acpi_get_first_physical_node - Get first physical node of an ACPI device
614 * @adev: ACPI device in question
616 * Return: First physical node of ACPI device @adev
618 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
620 struct mutex *physical_node_lock = &adev->physical_node_lock;
621 struct device *phys_dev;
623 mutex_lock(physical_node_lock);
624 if (list_empty(&adev->physical_node_list)) {
627 const struct acpi_device_physical_node *node;
629 node = list_first_entry(&adev->physical_node_list,
630 struct acpi_device_physical_node, node);
632 phys_dev = node->dev;
634 mutex_unlock(physical_node_lock);
637 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
639 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
640 const struct device *dev)
642 const struct device *phys_dev = acpi_get_first_physical_node(adev);
644 return phys_dev && phys_dev == dev ? adev : NULL;
648 * acpi_device_is_first_physical_node - Is given dev first physical node
649 * @adev: ACPI companion device
650 * @dev: Physical device to check
652 * Function checks if given @dev is the first physical devices attached to
653 * the ACPI companion device. This distinction is needed in some cases
654 * where the same companion device is shared between many physical devices.
656 * Note that the caller have to provide valid @adev pointer.
658 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
659 const struct device *dev)
661 return !!acpi_primary_dev_companion(adev, dev);
665 * acpi_companion_match() - Can we match via ACPI companion device
666 * @dev: Device in question
668 * Check if the given device has an ACPI companion and if that companion has
669 * a valid list of PNP IDs, and if the device is the first (primary) physical
670 * device associated with it. Return the companion pointer if that's the case
673 * If multiple physical devices are attached to a single ACPI companion, we need
674 * to be careful. The usage scenario for this kind of relationship is that all
675 * of the physical devices in question use resources provided by the ACPI
676 * companion. A typical case is an MFD device where all the sub-devices share
677 * the parent's ACPI companion. In such cases we can only allow the primary
678 * (first) physical device to be matched with the help of the companion's PNP
681 * Additional physical devices sharing the ACPI companion can still use
682 * resources available from it but they will be matched normally using functions
683 * provided by their bus types (and analogously for their modalias).
685 const struct acpi_device *acpi_companion_match(const struct device *dev)
687 struct acpi_device *adev;
689 adev = ACPI_COMPANION(dev);
693 if (list_empty(&adev->pnp.ids))
696 return acpi_primary_dev_companion(adev, dev);
700 * acpi_of_match_device - Match device object using the "compatible" property.
701 * @adev: ACPI device object to match.
702 * @of_match_table: List of device IDs to match against.
703 * @of_id: OF ID if matched
705 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
706 * identifiers and a _DSD object with the "compatible" property, use that
707 * property to match against the given list of identifiers.
709 static bool acpi_of_match_device(const struct acpi_device *adev,
710 const struct of_device_id *of_match_table,
711 const struct of_device_id **of_id)
713 const union acpi_object *of_compatible, *obj;
719 of_compatible = adev->data.of_compatible;
720 if (!of_match_table || !of_compatible)
723 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
724 nval = of_compatible->package.count;
725 obj = of_compatible->package.elements;
726 } else { /* Must be ACPI_TYPE_STRING. */
730 /* Now we can look for the driver DT compatible strings */
731 for (i = 0; i < nval; i++, obj++) {
732 const struct of_device_id *id;
734 for (id = of_match_table; id->compatible[0]; id++)
735 if (!strcasecmp(obj->string.pointer, id->compatible)) {
745 static bool acpi_of_modalias(struct acpi_device *adev,
746 char *modalias, size_t len)
748 const union acpi_object *of_compatible;
749 const union acpi_object *obj;
750 const char *str, *chr;
752 of_compatible = adev->data.of_compatible;
756 if (of_compatible->type == ACPI_TYPE_PACKAGE)
757 obj = of_compatible->package.elements;
758 else /* Must be ACPI_TYPE_STRING. */
761 str = obj->string.pointer;
762 chr = strchr(str, ',');
763 strscpy(modalias, chr ? chr + 1 : str, len);
769 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
770 * @adev: ACPI device object to match
771 * @default_id: ID string to use as default if no compatible string found
772 * @modalias: Pointer to buffer that modalias value will be copied into
773 * @len: Length of modalias buffer
775 * This is a counterpart of of_alias_from_compatible() for struct acpi_device
776 * objects. If there is a compatible string for @adev, it will be copied to
777 * @modalias with the vendor prefix stripped; otherwise, @default_id will be
780 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
781 char *modalias, size_t len)
783 if (!acpi_of_modalias(adev, modalias, len))
784 strscpy(modalias, default_id, len);
786 EXPORT_SYMBOL_GPL(acpi_set_modalias);
788 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
789 struct acpi_hardware_id *hwid)
791 int i, msk, byte_shift;
797 /* Apply class-code bitmask, before checking each class-code byte */
798 for (i = 1; i <= 3; i++) {
799 byte_shift = 8 * (3 - i);
800 msk = (id->cls_msk >> byte_shift) & 0xFF;
804 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
805 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
811 static bool __acpi_match_device(const struct acpi_device *device,
812 const struct acpi_device_id *acpi_ids,
813 const struct of_device_id *of_ids,
814 const struct acpi_device_id **acpi_id,
815 const struct of_device_id **of_id)
817 const struct acpi_device_id *id;
818 struct acpi_hardware_id *hwid;
821 * If the device is not present, it is unnecessary to load device
824 if (!device || !device->status.present)
827 list_for_each_entry(hwid, &device->pnp.ids, list) {
828 /* First, check the ACPI/PNP IDs provided by the caller. */
830 for (id = acpi_ids; id->id[0] || id->cls; id++) {
831 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
833 if (id->cls && __acpi_match_device_cls(id, hwid))
839 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
840 * "compatible" property if found.
842 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
843 return acpi_of_match_device(device, of_ids, of_id);
854 * acpi_match_acpi_device - Match an ACPI device against a given list of ACPI IDs
855 * @ids: Array of struct acpi_device_id objects to match against.
856 * @adev: The ACPI device pointer to match.
858 * Match the ACPI device @adev against a given list of ACPI IDs @ids.
861 * a pointer to the first matching ACPI ID on success or %NULL on failure.
863 const struct acpi_device_id *acpi_match_acpi_device(const struct acpi_device_id *ids,
864 const struct acpi_device *adev)
866 const struct acpi_device_id *id = NULL;
868 __acpi_match_device(adev, ids, NULL, &id, NULL);
871 EXPORT_SYMBOL_GPL(acpi_match_acpi_device);
874 * acpi_match_device - Match a struct device against a given list of ACPI IDs
875 * @ids: Array of struct acpi_device_id object to match against.
876 * @dev: The device structure to match.
878 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
879 * object for that handle and use that object to match against a given list of
882 * Return a pointer to the first matching ID on success or %NULL on failure.
884 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
885 const struct device *dev)
887 return acpi_match_acpi_device(ids, acpi_companion_match(dev));
889 EXPORT_SYMBOL_GPL(acpi_match_device);
891 static const void *acpi_of_device_get_match_data(const struct device *dev)
893 struct acpi_device *adev = ACPI_COMPANION(dev);
894 const struct of_device_id *match = NULL;
896 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
902 const void *acpi_device_get_match_data(const struct device *dev)
904 const struct acpi_device_id *acpi_ids = dev->driver->acpi_match_table;
905 const struct acpi_device_id *match;
908 return acpi_of_device_get_match_data(dev);
910 match = acpi_match_device(acpi_ids, dev);
914 return (const void *)match->driver_data;
916 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
918 int acpi_match_device_ids(struct acpi_device *device,
919 const struct acpi_device_id *ids)
921 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
923 EXPORT_SYMBOL(acpi_match_device_ids);
925 bool acpi_driver_match_device(struct device *dev,
926 const struct device_driver *drv)
928 const struct acpi_device_id *acpi_ids = drv->acpi_match_table;
929 const struct of_device_id *of_ids = drv->of_match_table;
932 return acpi_of_match_device(ACPI_COMPANION(dev), of_ids, NULL);
934 return __acpi_match_device(acpi_companion_match(dev), acpi_ids, of_ids, NULL, NULL);
936 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
938 /* --------------------------------------------------------------------------
939 ACPI Driver Management
940 -------------------------------------------------------------------------- */
943 * acpi_bus_register_driver - register a driver with the ACPI bus
944 * @driver: driver being registered
946 * Registers a driver with the ACPI bus. Searches the namespace for all
947 * devices that match the driver's criteria and binds. Returns zero for
948 * success or a negative error status for failure.
950 int acpi_bus_register_driver(struct acpi_driver *driver)
954 driver->drv.name = driver->name;
955 driver->drv.bus = &acpi_bus_type;
956 driver->drv.owner = driver->owner;
958 return driver_register(&driver->drv);
961 EXPORT_SYMBOL(acpi_bus_register_driver);
964 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
965 * @driver: driver to unregister
967 * Unregisters a driver with the ACPI bus. Searches the namespace for all
968 * devices that match the driver's criteria and unbinds.
970 void acpi_bus_unregister_driver(struct acpi_driver *driver)
972 driver_unregister(&driver->drv);
975 EXPORT_SYMBOL(acpi_bus_unregister_driver);
977 /* --------------------------------------------------------------------------
979 -------------------------------------------------------------------------- */
981 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
983 struct acpi_device *acpi_dev = to_acpi_device(dev);
984 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
986 return acpi_dev->flags.match_driver
987 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
990 static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
992 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
995 static int acpi_device_probe(struct device *dev)
997 struct acpi_device *acpi_dev = to_acpi_device(dev);
998 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1001 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1004 if (!acpi_drv->ops.add)
1007 ret = acpi_drv->ops.add(acpi_dev);
1011 pr_debug("Driver [%s] successfully bound to device [%s]\n",
1012 acpi_drv->name, acpi_dev->pnp.bus_id);
1014 if (acpi_drv->ops.notify) {
1015 ret = acpi_device_install_notify_handler(acpi_dev, acpi_drv);
1017 if (acpi_drv->ops.remove)
1018 acpi_drv->ops.remove(acpi_dev);
1020 acpi_dev->driver_data = NULL;
1025 pr_debug("Found driver [%s] for device [%s]\n", acpi_drv->name,
1026 acpi_dev->pnp.bus_id);
1032 static void acpi_device_remove(struct device *dev)
1034 struct acpi_device *acpi_dev = to_acpi_device(dev);
1035 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
1037 if (acpi_drv->ops.notify)
1038 acpi_device_remove_notify_handler(acpi_dev, acpi_drv);
1040 if (acpi_drv->ops.remove)
1041 acpi_drv->ops.remove(acpi_dev);
1043 acpi_dev->driver_data = NULL;
1048 struct bus_type acpi_bus_type = {
1050 .match = acpi_bus_match,
1051 .probe = acpi_device_probe,
1052 .remove = acpi_device_remove,
1053 .uevent = acpi_device_uevent,
1056 int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
1058 return bus_for_each_dev(&acpi_bus_type, NULL, data, fn);
1060 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
1062 struct acpi_dev_walk_context {
1063 int (*fn)(struct acpi_device *, void *);
1067 static int acpi_dev_for_one_check(struct device *dev, void *context)
1069 struct acpi_dev_walk_context *adwc = context;
1071 if (dev->bus != &acpi_bus_type)
1074 return adwc->fn(to_acpi_device(dev), adwc->data);
1076 EXPORT_SYMBOL_GPL(acpi_dev_for_each_child);
1078 int acpi_dev_for_each_child(struct acpi_device *adev,
1079 int (*fn)(struct acpi_device *, void *), void *data)
1081 struct acpi_dev_walk_context adwc = {
1086 return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
1089 int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
1090 int (*fn)(struct acpi_device *, void *),
1093 struct acpi_dev_walk_context adwc = {
1098 return device_for_each_child_reverse(&adev->dev, &adwc, acpi_dev_for_one_check);
1101 /* --------------------------------------------------------------------------
1102 Initialization/Cleanup
1103 -------------------------------------------------------------------------- */
1105 static int __init acpi_bus_init_irq(void)
1108 char *message = NULL;
1112 * Let the system know what interrupt model we are using by
1113 * evaluating the \_PIC object, if exists.
1116 switch (acpi_irq_model) {
1117 case ACPI_IRQ_MODEL_PIC:
1120 case ACPI_IRQ_MODEL_IOAPIC:
1123 case ACPI_IRQ_MODEL_IOSAPIC:
1124 message = "IOSAPIC";
1126 case ACPI_IRQ_MODEL_GIC:
1129 case ACPI_IRQ_MODEL_PLATFORM:
1130 message = "platform specific model";
1132 case ACPI_IRQ_MODEL_LPIC:
1136 pr_info("Unknown interrupt routing model\n");
1140 pr_info("Using %s for interrupt routing\n", message);
1142 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1143 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1144 pr_info("_PIC evaluation failed: %s\n", acpi_format_exception(status));
1152 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1154 * The ACPI tables are accessible after this, but the handling of events has not
1155 * been initialized and the global lock is not available yet, so AML should not
1156 * be executed at this point.
1158 * Doing this before switching the EFI runtime services to virtual mode allows
1159 * the EfiBootServices memory to be freed slightly earlier on boot.
1161 void __init acpi_early_init(void)
1168 pr_info("Core revision %08x\n", ACPI_CA_VERSION);
1170 /* enable workarounds, unless strict ACPI spec. compliance */
1172 acpi_gbl_enable_interpreter_slack = TRUE;
1174 acpi_permanent_mmap = true;
1178 * If the machine falls into the DMI check table,
1179 * DSDT will be copied to memory.
1180 * Note that calling dmi_check_system() here on other architectures
1181 * would not be OK because only x86 initializes dmi early enough.
1182 * Thankfully only x86 systems need such quirks for now.
1184 dmi_check_system(dsdt_dmi_table);
1187 status = acpi_reallocate_root_table();
1188 if (ACPI_FAILURE(status)) {
1189 pr_err("Unable to reallocate ACPI tables\n");
1193 status = acpi_initialize_subsystem();
1194 if (ACPI_FAILURE(status)) {
1195 pr_err("Unable to initialize the ACPI Interpreter\n");
1201 /* compatible (0) means level (3) */
1202 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1203 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1204 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1206 /* Set PIC-mode SCI trigger type */
1207 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1208 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1211 * now that acpi_gbl_FADT is initialized,
1212 * update it with result from INT_SRC_OVR parsing
1214 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1224 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1226 * Switch over the platform to the ACPI mode (if possible).
1228 * Doing this too early is generally unsafe, but at the same time it needs to be
1229 * done before all things that really depend on ACPI. The right spot appears to
1230 * be before finalizing the EFI initialization.
1232 void __init acpi_subsystem_init(void)
1239 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1240 if (ACPI_FAILURE(status)) {
1241 pr_err("Unable to enable ACPI\n");
1245 * If the system is using ACPI then we can be reasonably
1246 * confident that any regulators are managed by the firmware
1247 * so tell the regulator core it has everything it needs to
1250 regulator_has_full_constraints();
1254 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1256 if (event == ACPI_TABLE_EVENT_LOAD)
1257 acpi_scan_table_notify();
1259 return acpi_sysfs_table_handler(event, table, context);
1262 static int __init acpi_bus_init(void)
1267 acpi_os_initialize1();
1269 status = acpi_load_tables();
1270 if (ACPI_FAILURE(status)) {
1271 pr_err("Unable to load the System Description Tables\n");
1276 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1277 * device is found in the namespace.
1279 * This is accomplished by looking for the ECDT table and getting the EC
1280 * parameters out of that.
1282 * Do that before calling acpi_initialize_objects() which may trigger EC
1283 * address space accesses.
1285 acpi_ec_ecdt_probe();
1287 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1288 if (ACPI_FAILURE(status)) {
1289 pr_err("Unable to start the ACPI Interpreter\n");
1293 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1294 if (ACPI_FAILURE(status)) {
1295 pr_err("Unable to initialize ACPI objects\n");
1299 /* Set capability bits for _OSC under processor scope */
1300 acpi_early_processor_osc();
1303 * _OSC method may exist in module level code,
1304 * so it must be run after ACPI_FULL_INITIALIZATION
1306 acpi_bus_osc_negotiate_platform_control();
1307 acpi_bus_osc_negotiate_usb_control();
1310 * _PDC control method may load dynamic SSDT tables,
1311 * and we need to install the table handler before that.
1313 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1317 acpi_early_processor_set_pdc();
1320 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1321 * is necessary to enable it as early as possible.
1323 acpi_ec_dsdt_probe();
1325 pr_info("Interpreter enabled\n");
1327 /* Initialize sleep structures */
1331 * Get the system interrupt model and evaluate \_PIC.
1333 result = acpi_bus_init_irq();
1338 * Register the for all standard device notifications.
1341 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1342 &acpi_bus_notify, NULL);
1343 if (ACPI_FAILURE(status)) {
1344 pr_err("Unable to register for system notifications\n");
1349 * Create the top ACPI proc directory
1351 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1353 result = bus_register(&acpi_bus_type);
1357 /* Mimic structured exception handling */
1363 struct kobject *acpi_kobj;
1364 EXPORT_SYMBOL_GPL(acpi_kobj);
1366 static int __init acpi_init(void)
1370 if (acpi_disabled) {
1371 pr_info("Interpreter disabled.\n");
1375 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1377 pr_debug("%s: kset create error\n", __func__);
1381 result = acpi_bus_init();
1383 kobject_put(acpi_kobj);
1389 pci_mmcfg_late_init();
1391 acpi_viot_early_init();
1396 acpi_debugfs_init();
1397 acpi_sleep_proc_init();
1398 acpi_wakeup_device_init();
1399 acpi_debugger_init();
1400 acpi_setup_sb_notify_handler();
1405 subsys_initcall(acpi_init);