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 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/ioport.h>
11 #include <linux/kernel.h>
12 #include <linux/list.h>
13 #include <linux/sched.h>
15 #include <linux/device.h>
16 #include <linux/proc_fs.h>
17 #include <linux/acpi.h>
18 #include <linux/slab.h>
19 #include <linux/regulator/machine.h>
20 #include <linux/workqueue.h>
21 #include <linux/reboot.h>
22 #include <linux/delay.h>
24 #include <asm/mpspec.h>
25 #include <linux/dmi.h>
27 #include <linux/acpi_iort.h>
28 #include <linux/pci.h>
29 #include <acpi/apei.h>
30 #include <linux/suspend.h>
34 #define _COMPONENT ACPI_BUS_COMPONENT
35 ACPI_MODULE_NAME("bus");
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 printk(KERN_NOTICE "%s detected - "
51 "force copy of DSDT to local memory\n", id->ident);
52 acpi_gbl_copy_dsdt_locally = 1;
57 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
59 * Invoke DSDT corruption work-around on all Toshiba Satellite.
60 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
63 .callback = set_copy_dsdt,
64 .ident = "TOSHIBA Satellite",
66 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
67 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
74 /* --------------------------------------------------------------------------
76 -------------------------------------------------------------------------- */
78 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
79 unsigned long long *sta)
83 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
84 if (ACPI_SUCCESS(status))
87 if (status == AE_NOT_FOUND) {
88 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
89 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
94 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
96 int acpi_bus_get_status(struct acpi_device *device)
99 unsigned long long sta;
101 if (acpi_device_always_present(device)) {
102 acpi_set_device_status(device, ACPI_STA_DEFAULT);
106 /* Battery devices must have their deps met before calling _STA */
107 if (acpi_device_is_battery(device) && device->dep_unmet) {
108 acpi_set_device_status(device, 0);
112 status = acpi_bus_get_status_handle(device->handle, &sta);
113 if (ACPI_FAILURE(status))
116 acpi_set_device_status(device, sta);
118 if (device->status.functional && !device->status.present) {
119 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
120 "functional but not present;\n",
121 device->pnp.bus_id, (u32)sta));
124 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
125 device->pnp.bus_id, (u32)sta));
128 EXPORT_SYMBOL(acpi_bus_get_status);
130 void acpi_bus_private_data_handler(acpi_handle handle,
135 EXPORT_SYMBOL(acpi_bus_private_data_handler);
137 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
141 status = acpi_attach_data(handle,
142 acpi_bus_private_data_handler, data);
143 if (ACPI_FAILURE(status)) {
144 acpi_handle_debug(handle, "Error attaching device data\n");
150 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
152 int acpi_bus_get_private_data(acpi_handle handle, void **data)
159 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
160 if (ACPI_FAILURE(status)) {
161 acpi_handle_debug(handle, "No context for object\n");
167 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
169 void acpi_bus_detach_private_data(acpi_handle handle)
171 acpi_detach_data(handle, acpi_bus_private_data_handler);
173 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
175 static void acpi_print_osc_error(acpi_handle handle,
176 struct acpi_osc_context *context, char *error)
180 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
182 pr_debug("_OSC request data:");
183 for (i = 0; i < context->cap.length; i += sizeof(u32))
184 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
189 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
192 struct acpi_object_list input;
193 union acpi_object in_params[4];
194 union acpi_object *out_obj;
197 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
201 if (guid_parse(context->uuid_str, &guid))
203 context->ret.length = ACPI_ALLOCATE_BUFFER;
204 context->ret.pointer = NULL;
206 /* Setting up input parameters */
208 input.pointer = in_params;
209 in_params[0].type = ACPI_TYPE_BUFFER;
210 in_params[0].buffer.length = 16;
211 in_params[0].buffer.pointer = (u8 *)&guid;
212 in_params[1].type = ACPI_TYPE_INTEGER;
213 in_params[1].integer.value = context->rev;
214 in_params[2].type = ACPI_TYPE_INTEGER;
215 in_params[2].integer.value = context->cap.length/sizeof(u32);
216 in_params[3].type = ACPI_TYPE_BUFFER;
217 in_params[3].buffer.length = context->cap.length;
218 in_params[3].buffer.pointer = context->cap.pointer;
220 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
221 if (ACPI_FAILURE(status))
225 return AE_NULL_OBJECT;
227 out_obj = output.pointer;
228 if (out_obj->type != ACPI_TYPE_BUFFER
229 || out_obj->buffer.length != context->cap.length) {
230 acpi_print_osc_error(handle, context,
231 "_OSC evaluation returned wrong type");
235 /* Need to ignore the bit0 in result code */
236 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
238 if (errors & OSC_REQUEST_ERROR)
239 acpi_print_osc_error(handle, context,
240 "_OSC request failed");
241 if (errors & OSC_INVALID_UUID_ERROR)
242 acpi_print_osc_error(handle, context,
243 "_OSC invalid UUID");
244 if (errors & OSC_INVALID_REVISION_ERROR)
245 acpi_print_osc_error(handle, context,
246 "_OSC invalid revision");
247 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
248 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
258 context->ret.length = out_obj->buffer.length;
259 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
260 context->ret.length, GFP_KERNEL);
261 if (!context->ret.pointer) {
262 status = AE_NO_MEMORY;
268 kfree(output.pointer);
270 context->ret.pointer = NULL;
273 EXPORT_SYMBOL(acpi_run_osc);
275 bool osc_sb_apei_support_acked;
278 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
279 * OSPM supports platform coordinated low power idle(LPI) states
281 bool osc_pc_lpi_support_confirmed;
282 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
285 * ACPI 6.4 Operating System Capabilities for USB.
287 bool osc_sb_native_usb4_support_confirmed;
288 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
290 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
291 static void acpi_bus_osc_negotiate_platform_control(void)
293 u32 capbuf[2], *capbuf_ret;
294 struct acpi_osc_context context = {
295 .uuid_str = sb_uuid_str,
298 .cap.pointer = capbuf,
302 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
303 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
304 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
305 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
306 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
307 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
309 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
310 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
313 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
316 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
317 if (boot_cpu_has(X86_FEATURE_HWP)) {
318 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
319 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
323 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
324 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
326 if (IS_ENABLED(CONFIG_USB4))
327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
330 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
331 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
334 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
337 capbuf_ret = context.ret.pointer;
338 if (context.ret.length <= OSC_SUPPORT_DWORD) {
339 kfree(context.ret.pointer);
344 * Now run _OSC again with query flag clear and with the caps
345 * supported by both the OS and the platform.
347 capbuf[OSC_QUERY_DWORD] = 0;
348 capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
349 kfree(context.ret.pointer);
351 if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
354 capbuf_ret = context.ret.pointer;
355 if (context.ret.length > OSC_SUPPORT_DWORD) {
356 osc_sb_apei_support_acked =
357 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
358 osc_pc_lpi_support_confirmed =
359 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
360 osc_sb_native_usb4_support_confirmed =
361 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
364 kfree(context.ret.pointer);
368 * Native control of USB4 capabilities. If any of the tunneling bits is
369 * set it means OS is in control and we use software based connection
372 u32 osc_sb_native_usb4_control;
373 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
375 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
377 printk(KERN_INFO PREFIX "%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
378 (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
379 (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
380 (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
381 (bits & OSC_USB_XDOMAIN) ? '+' : '-');
384 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
385 static void acpi_bus_osc_negotiate_usb_control(void)
388 struct acpi_osc_context context = {
389 .uuid_str = sb_usb_uuid_str,
391 .cap.length = sizeof(capbuf),
392 .cap.pointer = capbuf,
398 if (!osc_sb_native_usb4_support_confirmed)
401 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
404 control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
405 OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
407 capbuf[OSC_QUERY_DWORD] = 0;
408 capbuf[OSC_SUPPORT_DWORD] = 0;
409 capbuf[OSC_CONTROL_DWORD] = control;
411 status = acpi_run_osc(handle, &context);
412 if (ACPI_FAILURE(status))
415 if (context.ret.length != sizeof(capbuf)) {
416 printk(KERN_INFO PREFIX "USB4 _OSC: returned invalid length buffer\n");
420 osc_sb_native_usb4_control =
421 control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
423 acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
424 acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
425 osc_sb_native_usb4_control);
428 kfree(context.ret.pointer);
431 /* --------------------------------------------------------------------------
432 Notification Handling
433 -------------------------------------------------------------------------- */
438 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
440 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
442 struct acpi_device *adev;
443 struct acpi_driver *driver;
444 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
445 bool hotplug_event = false;
448 case ACPI_NOTIFY_BUS_CHECK:
449 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
450 hotplug_event = true;
453 case ACPI_NOTIFY_DEVICE_CHECK:
454 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
455 hotplug_event = true;
458 case ACPI_NOTIFY_DEVICE_WAKE:
459 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
462 case ACPI_NOTIFY_EJECT_REQUEST:
463 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
464 hotplug_event = true;
467 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
468 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
469 /* TBD: Exactly what does 'light' mean? */
472 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
473 acpi_handle_err(handle, "Device cannot be configured due "
474 "to a frequency mismatch\n");
477 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
478 acpi_handle_err(handle, "Device cannot be configured due "
479 "to a bus mode mismatch\n");
482 case ACPI_NOTIFY_POWER_FAULT:
483 acpi_handle_err(handle, "Device has suffered a power fault\n");
487 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
491 adev = acpi_bus_get_acpi_device(handle);
495 driver = adev->driver;
496 if (driver && driver->ops.notify &&
497 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
498 driver->ops.notify(adev, type);
500 if (!hotplug_event) {
501 acpi_bus_put_acpi_device(adev);
505 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
508 acpi_bus_put_acpi_device(adev);
511 acpi_evaluate_ost(handle, type, ost_code, NULL);
514 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
516 struct acpi_device *device = data;
518 device->driver->ops.notify(device, event);
521 static void acpi_device_notify_fixed(void *data)
523 struct acpi_device *device = data;
525 /* Fixed hardware devices have no handles */
526 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
529 static u32 acpi_device_fixed_event(void *data)
531 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
532 return ACPI_INTERRUPT_HANDLED;
535 static int acpi_device_install_notify_handler(struct acpi_device *device)
539 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
541 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
542 acpi_device_fixed_event,
544 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
546 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
547 acpi_device_fixed_event,
550 status = acpi_install_notify_handler(device->handle,
555 if (ACPI_FAILURE(status))
560 static void acpi_device_remove_notify_handler(struct acpi_device *device)
562 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
563 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
564 acpi_device_fixed_event);
565 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
566 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
567 acpi_device_fixed_event);
569 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
573 /* Handle events targeting \_SB device (at present only graceful shutdown) */
575 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
576 #define ACPI_SB_INDICATE_INTERVAL 10000
578 static void sb_notify_work(struct work_struct *dummy)
580 acpi_handle sb_handle;
582 orderly_poweroff(true);
585 * After initiating graceful shutdown, the ACPI spec requires OSPM
586 * to evaluate _OST method once every 10seconds to indicate that
587 * the shutdown is in progress
589 acpi_get_handle(NULL, "\\_SB", &sb_handle);
591 pr_info("Graceful shutdown in progress.\n");
592 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
593 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
594 msleep(ACPI_SB_INDICATE_INTERVAL);
598 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
600 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
602 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
603 if (!work_busy(&acpi_sb_work))
604 schedule_work(&acpi_sb_work);
606 pr_warn("event %x is not supported by \\_SB device\n", event);
609 static int __init acpi_setup_sb_notify_handler(void)
611 acpi_handle sb_handle;
613 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
616 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
617 acpi_sb_notify, NULL)))
623 /* --------------------------------------------------------------------------
625 -------------------------------------------------------------------------- */
628 * acpi_get_first_physical_node - Get first physical node of an ACPI device
629 * @adev: ACPI device in question
631 * Return: First physical node of ACPI device @adev
633 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
635 struct mutex *physical_node_lock = &adev->physical_node_lock;
636 struct device *phys_dev;
638 mutex_lock(physical_node_lock);
639 if (list_empty(&adev->physical_node_list)) {
642 const struct acpi_device_physical_node *node;
644 node = list_first_entry(&adev->physical_node_list,
645 struct acpi_device_physical_node, node);
647 phys_dev = node->dev;
649 mutex_unlock(physical_node_lock);
652 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
654 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
655 const struct device *dev)
657 const struct device *phys_dev = acpi_get_first_physical_node(adev);
659 return phys_dev && phys_dev == dev ? adev : NULL;
663 * acpi_device_is_first_physical_node - Is given dev first physical node
664 * @adev: ACPI companion device
665 * @dev: Physical device to check
667 * Function checks if given @dev is the first physical devices attached to
668 * the ACPI companion device. This distinction is needed in some cases
669 * where the same companion device is shared between many physical devices.
671 * Note that the caller have to provide valid @adev pointer.
673 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
674 const struct device *dev)
676 return !!acpi_primary_dev_companion(adev, dev);
680 * acpi_companion_match() - Can we match via ACPI companion device
681 * @dev: Device in question
683 * Check if the given device has an ACPI companion and if that companion has
684 * a valid list of PNP IDs, and if the device is the first (primary) physical
685 * device associated with it. Return the companion pointer if that's the case
688 * If multiple physical devices are attached to a single ACPI companion, we need
689 * to be careful. The usage scenario for this kind of relationship is that all
690 * of the physical devices in question use resources provided by the ACPI
691 * companion. A typical case is an MFD device where all the sub-devices share
692 * the parent's ACPI companion. In such cases we can only allow the primary
693 * (first) physical device to be matched with the help of the companion's PNP
696 * Additional physical devices sharing the ACPI companion can still use
697 * resources available from it but they will be matched normally using functions
698 * provided by their bus types (and analogously for their modalias).
700 struct acpi_device *acpi_companion_match(const struct device *dev)
702 struct acpi_device *adev;
704 adev = ACPI_COMPANION(dev);
708 if (list_empty(&adev->pnp.ids))
711 return acpi_primary_dev_companion(adev, dev);
715 * acpi_of_match_device - Match device object using the "compatible" property.
716 * @adev: ACPI device object to match.
717 * @of_match_table: List of device IDs to match against.
718 * @of_id: OF ID if matched
720 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
721 * identifiers and a _DSD object with the "compatible" property, use that
722 * property to match against the given list of identifiers.
724 static bool acpi_of_match_device(struct acpi_device *adev,
725 const struct of_device_id *of_match_table,
726 const struct of_device_id **of_id)
728 const union acpi_object *of_compatible, *obj;
734 of_compatible = adev->data.of_compatible;
735 if (!of_match_table || !of_compatible)
738 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
739 nval = of_compatible->package.count;
740 obj = of_compatible->package.elements;
741 } else { /* Must be ACPI_TYPE_STRING. */
745 /* Now we can look for the driver DT compatible strings */
746 for (i = 0; i < nval; i++, obj++) {
747 const struct of_device_id *id;
749 for (id = of_match_table; id->compatible[0]; id++)
750 if (!strcasecmp(obj->string.pointer, id->compatible)) {
760 static bool acpi_of_modalias(struct acpi_device *adev,
761 char *modalias, size_t len)
763 const union acpi_object *of_compatible;
764 const union acpi_object *obj;
765 const char *str, *chr;
767 of_compatible = adev->data.of_compatible;
771 if (of_compatible->type == ACPI_TYPE_PACKAGE)
772 obj = of_compatible->package.elements;
773 else /* Must be ACPI_TYPE_STRING. */
776 str = obj->string.pointer;
777 chr = strchr(str, ',');
778 strlcpy(modalias, chr ? chr + 1 : str, len);
784 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
785 * @adev: ACPI device object to match
786 * @default_id: ID string to use as default if no compatible string found
787 * @modalias: Pointer to buffer that modalias value will be copied into
788 * @len: Length of modalias buffer
790 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
791 * If there is a compatible string for @adev, it will be copied to @modalias
792 * with the vendor prefix stripped; otherwise, @default_id will be used.
794 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
795 char *modalias, size_t len)
797 if (!acpi_of_modalias(adev, modalias, len))
798 strlcpy(modalias, default_id, len);
800 EXPORT_SYMBOL_GPL(acpi_set_modalias);
802 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
803 struct acpi_hardware_id *hwid)
805 int i, msk, byte_shift;
811 /* Apply class-code bitmask, before checking each class-code byte */
812 for (i = 1; i <= 3; i++) {
813 byte_shift = 8 * (3 - i);
814 msk = (id->cls_msk >> byte_shift) & 0xFF;
818 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
819 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
825 static bool __acpi_match_device(struct acpi_device *device,
826 const struct acpi_device_id *acpi_ids,
827 const struct of_device_id *of_ids,
828 const struct acpi_device_id **acpi_id,
829 const struct of_device_id **of_id)
831 const struct acpi_device_id *id;
832 struct acpi_hardware_id *hwid;
835 * If the device is not present, it is unnecessary to load device
838 if (!device || !device->status.present)
841 list_for_each_entry(hwid, &device->pnp.ids, list) {
842 /* First, check the ACPI/PNP IDs provided by the caller. */
844 for (id = acpi_ids; id->id[0] || id->cls; id++) {
845 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
847 if (id->cls && __acpi_match_device_cls(id, hwid))
853 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
854 * "compatible" property if found.
856 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
857 return acpi_of_match_device(device, of_ids, of_id);
868 * acpi_match_device - Match a struct device against a given list of ACPI IDs
869 * @ids: Array of struct acpi_device_id object to match against.
870 * @dev: The device structure to match.
872 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
873 * object for that handle and use that object to match against a given list of
876 * Return a pointer to the first matching ID on success or %NULL on failure.
878 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
879 const struct device *dev)
881 const struct acpi_device_id *id = NULL;
883 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
886 EXPORT_SYMBOL_GPL(acpi_match_device);
888 static const void *acpi_of_device_get_match_data(const struct device *dev)
890 struct acpi_device *adev = ACPI_COMPANION(dev);
891 const struct of_device_id *match = NULL;
893 if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
899 const void *acpi_device_get_match_data(const struct device *dev)
901 const struct acpi_device_id *match;
903 if (!dev->driver->acpi_match_table)
904 return acpi_of_device_get_match_data(dev);
906 match = acpi_match_device(dev->driver->acpi_match_table, dev);
910 return (const void *)match->driver_data;
912 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
914 int acpi_match_device_ids(struct acpi_device *device,
915 const struct acpi_device_id *ids)
917 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
919 EXPORT_SYMBOL(acpi_match_device_ids);
921 bool acpi_driver_match_device(struct device *dev,
922 const struct device_driver *drv)
924 if (!drv->acpi_match_table)
925 return acpi_of_match_device(ACPI_COMPANION(dev),
929 return __acpi_match_device(acpi_companion_match(dev),
930 drv->acpi_match_table, drv->of_match_table,
933 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
935 /* --------------------------------------------------------------------------
936 ACPI Driver Management
937 -------------------------------------------------------------------------- */
940 * acpi_bus_register_driver - register a driver with the ACPI bus
941 * @driver: driver being registered
943 * Registers a driver with the ACPI bus. Searches the namespace for all
944 * devices that match the driver's criteria and binds. Returns zero for
945 * success or a negative error status for failure.
947 int acpi_bus_register_driver(struct acpi_driver *driver)
953 driver->drv.name = driver->name;
954 driver->drv.bus = &acpi_bus_type;
955 driver->drv.owner = driver->owner;
957 ret = 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(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 acpi_dev->driver = acpi_drv;
1012 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1013 "Driver [%s] successfully bound to device [%s]\n",
1014 acpi_drv->name, acpi_dev->pnp.bus_id));
1016 if (acpi_drv->ops.notify) {
1017 ret = acpi_device_install_notify_handler(acpi_dev);
1019 if (acpi_drv->ops.remove)
1020 acpi_drv->ops.remove(acpi_dev);
1022 acpi_dev->driver = NULL;
1023 acpi_dev->driver_data = NULL;
1028 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1029 acpi_drv->name, acpi_dev->pnp.bus_id));
1034 static int acpi_device_remove(struct device *dev)
1036 struct acpi_device *acpi_dev = to_acpi_device(dev);
1037 struct acpi_driver *acpi_drv = acpi_dev->driver;
1040 if (acpi_drv->ops.notify)
1041 acpi_device_remove_notify_handler(acpi_dev);
1042 if (acpi_drv->ops.remove)
1043 acpi_drv->ops.remove(acpi_dev);
1045 acpi_dev->driver = NULL;
1046 acpi_dev->driver_data = NULL;
1052 struct bus_type acpi_bus_type = {
1054 .match = acpi_bus_match,
1055 .probe = acpi_device_probe,
1056 .remove = acpi_device_remove,
1057 .uevent = acpi_device_uevent,
1060 /* --------------------------------------------------------------------------
1061 Initialization/Cleanup
1062 -------------------------------------------------------------------------- */
1064 static int __init acpi_bus_init_irq(void)
1067 char *message = NULL;
1071 * Let the system know what interrupt model we are using by
1072 * evaluating the \_PIC object, if exists.
1075 switch (acpi_irq_model) {
1076 case ACPI_IRQ_MODEL_PIC:
1079 case ACPI_IRQ_MODEL_IOAPIC:
1082 case ACPI_IRQ_MODEL_IOSAPIC:
1083 message = "IOSAPIC";
1085 case ACPI_IRQ_MODEL_GIC:
1088 case ACPI_IRQ_MODEL_PLATFORM:
1089 message = "platform specific model";
1092 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
1096 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
1098 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1099 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1100 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1108 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1110 * The ACPI tables are accessible after this, but the handling of events has not
1111 * been initialized and the global lock is not available yet, so AML should not
1112 * be executed at this point.
1114 * Doing this before switching the EFI runtime services to virtual mode allows
1115 * the EfiBootServices memory to be freed slightly earlier on boot.
1117 void __init acpi_early_init(void)
1124 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1126 /* enable workarounds, unless strict ACPI spec. compliance */
1128 acpi_gbl_enable_interpreter_slack = TRUE;
1130 acpi_permanent_mmap = true;
1134 * If the machine falls into the DMI check table,
1135 * DSDT will be copied to memory.
1136 * Note that calling dmi_check_system() here on other architectures
1137 * would not be OK because only x86 initializes dmi early enough.
1138 * Thankfully only x86 systems need such quirks for now.
1140 dmi_check_system(dsdt_dmi_table);
1143 status = acpi_reallocate_root_table();
1144 if (ACPI_FAILURE(status)) {
1145 printk(KERN_ERR PREFIX
1146 "Unable to reallocate ACPI tables\n");
1150 status = acpi_initialize_subsystem();
1151 if (ACPI_FAILURE(status)) {
1152 printk(KERN_ERR PREFIX
1153 "Unable to initialize the ACPI Interpreter\n");
1159 /* compatible (0) means level (3) */
1160 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1161 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1162 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1164 /* Set PIC-mode SCI trigger type */
1165 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1166 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1169 * now that acpi_gbl_FADT is initialized,
1170 * update it with result from INT_SRC_OVR parsing
1172 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1182 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1184 * Switch over the platform to the ACPI mode (if possible).
1186 * Doing this too early is generally unsafe, but at the same time it needs to be
1187 * done before all things that really depend on ACPI. The right spot appears to
1188 * be before finalizing the EFI initialization.
1190 void __init acpi_subsystem_init(void)
1197 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1198 if (ACPI_FAILURE(status)) {
1199 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1203 * If the system is using ACPI then we can be reasonably
1204 * confident that any regulators are managed by the firmware
1205 * so tell the regulator core it has everything it needs to
1208 regulator_has_full_constraints();
1212 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1214 acpi_scan_table_handler(event, table, context);
1216 return acpi_sysfs_table_handler(event, table, context);
1219 static int __init acpi_bus_init(void)
1224 acpi_os_initialize1();
1226 status = acpi_load_tables();
1227 if (ACPI_FAILURE(status)) {
1228 printk(KERN_ERR PREFIX
1229 "Unable to load the System Description Tables\n");
1234 * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1235 * device is found in the namespace.
1237 * This is accomplished by looking for the ECDT table and getting the EC
1238 * parameters out of that.
1240 * Do that before calling acpi_initialize_objects() which may trigger EC
1241 * address space accesses.
1243 acpi_ec_ecdt_probe();
1245 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1246 if (ACPI_FAILURE(status)) {
1247 printk(KERN_ERR PREFIX
1248 "Unable to start the ACPI Interpreter\n");
1252 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1253 if (ACPI_FAILURE(status)) {
1254 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1258 /* Set capability bits for _OSC under processor scope */
1259 acpi_early_processor_osc();
1262 * _OSC method may exist in module level code,
1263 * so it must be run after ACPI_FULL_INITIALIZATION
1265 acpi_bus_osc_negotiate_platform_control();
1266 acpi_bus_osc_negotiate_usb_control();
1269 * _PDC control method may load dynamic SSDT tables,
1270 * and we need to install the table handler before that.
1272 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1276 acpi_early_processor_set_pdc();
1279 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1280 * is necessary to enable it as early as possible.
1282 acpi_ec_dsdt_probe();
1284 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1286 /* Initialize sleep structures */
1290 * Get the system interrupt model and evaluate \_PIC.
1292 result = acpi_bus_init_irq();
1297 * Register the for all standard device notifications.
1300 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1301 &acpi_bus_notify, NULL);
1302 if (ACPI_FAILURE(status)) {
1303 printk(KERN_ERR PREFIX
1304 "Unable to register for device notifications\n");
1309 * Create the top ACPI proc directory
1311 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1313 result = bus_register(&acpi_bus_type);
1317 /* Mimic structured exception handling */
1323 struct kobject *acpi_kobj;
1324 EXPORT_SYMBOL_GPL(acpi_kobj);
1326 static int __init acpi_init(void)
1330 if (acpi_disabled) {
1331 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1335 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1337 printk(KERN_WARNING "%s: kset create error\n", __func__);
1341 result = acpi_bus_init();
1347 pci_mmcfg_late_init();
1351 acpi_debugfs_init();
1352 acpi_sleep_proc_init();
1353 acpi_wakeup_device_init();
1354 acpi_debugger_init();
1355 acpi_setup_sb_notify_handler();
1359 subsys_initcall(acpi_init);