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ACPI / processor_idle: Add support for Low Power Idle(LPI) states
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1/*
2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3 *
4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
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.
12 *
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.
17 *
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 */
20
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>
27#include <linux/pm.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#ifdef CONFIG_X86
34#include <asm/mpspec.h>
35#endif
36#include <linux/pci.h>
37#include <acpi/apei.h>
38#include <linux/dmi.h>
39#include <linux/suspend.h>
40
41#include "internal.h"
42
43#define _COMPONENT ACPI_BUS_COMPONENT
44ACPI_MODULE_NAME("bus");
45
46struct acpi_device *acpi_root;
47struct proc_dir_entry *acpi_root_dir;
48EXPORT_SYMBOL(acpi_root_dir);
49
50#ifdef CONFIG_X86
51#ifdef CONFIG_ACPI_CUSTOM_DSDT
52static inline int set_copy_dsdt(const struct dmi_system_id *id)
53{
54 return 0;
55}
56#else
57static int set_copy_dsdt(const struct dmi_system_id *id)
58{
59 printk(KERN_NOTICE "%s detected - "
60 "force copy of DSDT to local memory\n", id->ident);
61 acpi_gbl_copy_dsdt_locally = 1;
62 return 0;
63}
64#endif
65
66static struct dmi_system_id dsdt_dmi_table[] __initdata = {
67 /*
68 * Invoke DSDT corruption work-around on all Toshiba Satellite.
69 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
70 */
71 {
72 .callback = set_copy_dsdt,
73 .ident = "TOSHIBA Satellite",
74 .matches = {
75 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
76 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
77 },
78 },
79 {}
80};
81#else
82static struct dmi_system_id dsdt_dmi_table[] __initdata = {
83 {}
84};
85#endif
86
87/* --------------------------------------------------------------------------
88 Device Management
89 -------------------------------------------------------------------------- */
90
91acpi_status acpi_bus_get_status_handle(acpi_handle handle,
92 unsigned long long *sta)
93{
94 acpi_status status;
95
96 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
97 if (ACPI_SUCCESS(status))
98 return AE_OK;
99
100 if (status == AE_NOT_FOUND) {
101 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
102 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
103 return AE_OK;
104 }
105 return status;
106}
107
108int acpi_bus_get_status(struct acpi_device *device)
109{
110 acpi_status status;
111 unsigned long long sta;
112
113 status = acpi_bus_get_status_handle(device->handle, &sta);
114 if (ACPI_FAILURE(status))
115 return -ENODEV;
116
117 acpi_set_device_status(device, sta);
118
119 if (device->status.functional && !device->status.present) {
120 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
121 "functional but not present;\n",
122 device->pnp.bus_id, (u32)sta));
123 }
124
125 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
126 device->pnp.bus_id, (u32)sta));
127 return 0;
128}
129EXPORT_SYMBOL(acpi_bus_get_status);
130
131void acpi_bus_private_data_handler(acpi_handle handle,
132 void *context)
133{
134 return;
135}
136EXPORT_SYMBOL(acpi_bus_private_data_handler);
137
138int acpi_bus_attach_private_data(acpi_handle handle, void *data)
139{
140 acpi_status status;
141
142 status = acpi_attach_data(handle,
143 acpi_bus_private_data_handler, data);
144 if (ACPI_FAILURE(status)) {
145 acpi_handle_debug(handle, "Error attaching device data\n");
146 return -ENODEV;
147 }
148
149 return 0;
150}
151EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
152
153int acpi_bus_get_private_data(acpi_handle handle, void **data)
154{
155 acpi_status status;
156
157 if (!*data)
158 return -EINVAL;
159
160 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
161 if (ACPI_FAILURE(status)) {
162 acpi_handle_debug(handle, "No context for object\n");
163 return -ENODEV;
164 }
165
166 return 0;
167}
168EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
169
170void acpi_bus_detach_private_data(acpi_handle handle)
171{
172 acpi_detach_data(handle, acpi_bus_private_data_handler);
173}
174EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
175
176static void acpi_print_osc_error(acpi_handle handle,
177 struct acpi_osc_context *context, char *error)
178{
179 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
180 int i;
181
182 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
183 printk(KERN_DEBUG "%s: %s\n", context->uuid_str, error);
184 else {
185 printk(KERN_DEBUG "%s (%s): %s\n",
186 (char *)buffer.pointer, context->uuid_str, error);
187 kfree(buffer.pointer);
188 }
189 printk(KERN_DEBUG "_OSC request data:");
190 for (i = 0; i < context->cap.length; i += sizeof(u32))
191 printk(" %x", *((u32 *)(context->cap.pointer + i)));
192 printk("\n");
193}
194
195acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
196{
197 int i;
198 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
199 24, 26, 28, 30, 32, 34};
200
201 if (strlen(str) != 36)
202 return AE_BAD_PARAMETER;
203 for (i = 0; i < 36; i++) {
204 if (i == 8 || i == 13 || i == 18 || i == 23) {
205 if (str[i] != '-')
206 return AE_BAD_PARAMETER;
207 } else if (!isxdigit(str[i]))
208 return AE_BAD_PARAMETER;
209 }
210 for (i = 0; i < 16; i++) {
211 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
212 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
213 }
214 return AE_OK;
215}
216EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
217
218acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
219{
220 acpi_status status;
221 struct acpi_object_list input;
222 union acpi_object in_params[4];
223 union acpi_object *out_obj;
224 u8 uuid[16];
225 u32 errors;
226 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
227
228 if (!context)
229 return AE_ERROR;
230 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
231 return AE_ERROR;
232 context->ret.length = ACPI_ALLOCATE_BUFFER;
233 context->ret.pointer = NULL;
234
235 /* Setting up input parameters */
236 input.count = 4;
237 input.pointer = in_params;
238 in_params[0].type = ACPI_TYPE_BUFFER;
239 in_params[0].buffer.length = 16;
240 in_params[0].buffer.pointer = uuid;
241 in_params[1].type = ACPI_TYPE_INTEGER;
242 in_params[1].integer.value = context->rev;
243 in_params[2].type = ACPI_TYPE_INTEGER;
244 in_params[2].integer.value = context->cap.length/sizeof(u32);
245 in_params[3].type = ACPI_TYPE_BUFFER;
246 in_params[3].buffer.length = context->cap.length;
247 in_params[3].buffer.pointer = context->cap.pointer;
248
249 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
250 if (ACPI_FAILURE(status))
251 return status;
252
253 if (!output.length)
254 return AE_NULL_OBJECT;
255
256 out_obj = output.pointer;
257 if (out_obj->type != ACPI_TYPE_BUFFER
258 || out_obj->buffer.length != context->cap.length) {
259 acpi_print_osc_error(handle, context,
260 "_OSC evaluation returned wrong type");
261 status = AE_TYPE;
262 goto out_kfree;
263 }
264 /* Need to ignore the bit0 in result code */
265 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
266 if (errors) {
267 if (errors & OSC_REQUEST_ERROR)
268 acpi_print_osc_error(handle, context,
269 "_OSC request failed");
270 if (errors & OSC_INVALID_UUID_ERROR)
271 acpi_print_osc_error(handle, context,
272 "_OSC invalid UUID");
273 if (errors & OSC_INVALID_REVISION_ERROR)
274 acpi_print_osc_error(handle, context,
275 "_OSC invalid revision");
276 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
277 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
278 & OSC_QUERY_ENABLE)
279 goto out_success;
280 status = AE_SUPPORT;
281 goto out_kfree;
282 }
283 status = AE_ERROR;
284 goto out_kfree;
285 }
286out_success:
287 context->ret.length = out_obj->buffer.length;
288 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
289 context->ret.length, GFP_KERNEL);
290 if (!context->ret.pointer) {
291 status = AE_NO_MEMORY;
292 goto out_kfree;
293 }
294 status = AE_OK;
295
296out_kfree:
297 kfree(output.pointer);
298 if (status != AE_OK)
299 context->ret.pointer = NULL;
300 return status;
301}
302EXPORT_SYMBOL(acpi_run_osc);
303
304bool osc_sb_apei_support_acked;
305
306/*
307 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
308 * OSPM supports platform coordinated low power idle(LPI) states
309 */
310bool osc_pc_lpi_support_confirmed;
311EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
312
313static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
314static void acpi_bus_osc_support(void)
315{
316 u32 capbuf[2];
317 struct acpi_osc_context context = {
318 .uuid_str = sb_uuid_str,
319 .rev = 1,
320 .cap.length = 8,
321 .cap.pointer = capbuf,
322 };
323 acpi_handle handle;
324
325 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
326 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
327 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
329 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
330 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
331
332 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
333 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
334
335 if (!ghes_disable)
336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
337 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
338 return;
339 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
340 u32 *capbuf_ret = context.ret.pointer;
341 if (context.ret.length > OSC_SUPPORT_DWORD) {
342 osc_sb_apei_support_acked =
343 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
344 osc_pc_lpi_support_confirmed =
345 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
346 }
347 kfree(context.ret.pointer);
348 }
349 /* do we need to check other returned cap? Sounds no */
350}
351
352/* --------------------------------------------------------------------------
353 Notification Handling
354 -------------------------------------------------------------------------- */
355
356/**
357 * acpi_bus_notify
358 * ---------------
359 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
360 */
361static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
362{
363 struct acpi_device *adev;
364 struct acpi_driver *driver;
365 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
366 bool hotplug_event = false;
367
368 switch (type) {
369 case ACPI_NOTIFY_BUS_CHECK:
370 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
371 hotplug_event = true;
372 break;
373
374 case ACPI_NOTIFY_DEVICE_CHECK:
375 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
376 hotplug_event = true;
377 break;
378
379 case ACPI_NOTIFY_DEVICE_WAKE:
380 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
381 break;
382
383 case ACPI_NOTIFY_EJECT_REQUEST:
384 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
385 hotplug_event = true;
386 break;
387
388 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
389 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
390 /* TBD: Exactly what does 'light' mean? */
391 break;
392
393 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
394 acpi_handle_err(handle, "Device cannot be configured due "
395 "to a frequency mismatch\n");
396 break;
397
398 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
399 acpi_handle_err(handle, "Device cannot be configured due "
400 "to a bus mode mismatch\n");
401 break;
402
403 case ACPI_NOTIFY_POWER_FAULT:
404 acpi_handle_err(handle, "Device has suffered a power fault\n");
405 break;
406
407 default:
408 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
409 break;
410 }
411
412 adev = acpi_bus_get_acpi_device(handle);
413 if (!adev)
414 goto err;
415
416 driver = adev->driver;
417 if (driver && driver->ops.notify &&
418 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
419 driver->ops.notify(adev, type);
420
421 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
422 return;
423
424 acpi_bus_put_acpi_device(adev);
425 return;
426
427 err:
428 acpi_evaluate_ost(handle, type, ost_code, NULL);
429}
430
431static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
432{
433 struct acpi_device *device = data;
434
435 device->driver->ops.notify(device, event);
436}
437
438static void acpi_device_notify_fixed(void *data)
439{
440 struct acpi_device *device = data;
441
442 /* Fixed hardware devices have no handles */
443 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
444}
445
446static u32 acpi_device_fixed_event(void *data)
447{
448 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
449 return ACPI_INTERRUPT_HANDLED;
450}
451
452static int acpi_device_install_notify_handler(struct acpi_device *device)
453{
454 acpi_status status;
455
456 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
457 status =
458 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
459 acpi_device_fixed_event,
460 device);
461 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
462 status =
463 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
464 acpi_device_fixed_event,
465 device);
466 else
467 status = acpi_install_notify_handler(device->handle,
468 ACPI_DEVICE_NOTIFY,
469 acpi_device_notify,
470 device);
471
472 if (ACPI_FAILURE(status))
473 return -EINVAL;
474 return 0;
475}
476
477static void acpi_device_remove_notify_handler(struct acpi_device *device)
478{
479 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
480 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
481 acpi_device_fixed_event);
482 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
483 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
484 acpi_device_fixed_event);
485 else
486 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
487 acpi_device_notify);
488}
489
490/* --------------------------------------------------------------------------
491 Device Matching
492 -------------------------------------------------------------------------- */
493
494/**
495 * acpi_get_first_physical_node - Get first physical node of an ACPI device
496 * @adev: ACPI device in question
497 *
498 * Return: First physical node of ACPI device @adev
499 */
500struct device *acpi_get_first_physical_node(struct acpi_device *adev)
501{
502 struct mutex *physical_node_lock = &adev->physical_node_lock;
503 struct device *phys_dev;
504
505 mutex_lock(physical_node_lock);
506 if (list_empty(&adev->physical_node_list)) {
507 phys_dev = NULL;
508 } else {
509 const struct acpi_device_physical_node *node;
510
511 node = list_first_entry(&adev->physical_node_list,
512 struct acpi_device_physical_node, node);
513
514 phys_dev = node->dev;
515 }
516 mutex_unlock(physical_node_lock);
517 return phys_dev;
518}
519
520static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
521 const struct device *dev)
522{
523 const struct device *phys_dev = acpi_get_first_physical_node(adev);
524
525 return phys_dev && phys_dev == dev ? adev : NULL;
526}
527
528/**
529 * acpi_device_is_first_physical_node - Is given dev first physical node
530 * @adev: ACPI companion device
531 * @dev: Physical device to check
532 *
533 * Function checks if given @dev is the first physical devices attached to
534 * the ACPI companion device. This distinction is needed in some cases
535 * where the same companion device is shared between many physical devices.
536 *
537 * Note that the caller have to provide valid @adev pointer.
538 */
539bool acpi_device_is_first_physical_node(struct acpi_device *adev,
540 const struct device *dev)
541{
542 return !!acpi_primary_dev_companion(adev, dev);
543}
544
545/*
546 * acpi_companion_match() - Can we match via ACPI companion device
547 * @dev: Device in question
548 *
549 * Check if the given device has an ACPI companion and if that companion has
550 * a valid list of PNP IDs, and if the device is the first (primary) physical
551 * device associated with it. Return the companion pointer if that's the case
552 * or NULL otherwise.
553 *
554 * If multiple physical devices are attached to a single ACPI companion, we need
555 * to be careful. The usage scenario for this kind of relationship is that all
556 * of the physical devices in question use resources provided by the ACPI
557 * companion. A typical case is an MFD device where all the sub-devices share
558 * the parent's ACPI companion. In such cases we can only allow the primary
559 * (first) physical device to be matched with the help of the companion's PNP
560 * IDs.
561 *
562 * Additional physical devices sharing the ACPI companion can still use
563 * resources available from it but they will be matched normally using functions
564 * provided by their bus types (and analogously for their modalias).
565 */
566struct acpi_device *acpi_companion_match(const struct device *dev)
567{
568 struct acpi_device *adev;
569
570 adev = ACPI_COMPANION(dev);
571 if (!adev)
572 return NULL;
573
574 if (list_empty(&adev->pnp.ids))
575 return NULL;
576
577 return acpi_primary_dev_companion(adev, dev);
578}
579
580/**
581 * acpi_of_match_device - Match device object using the "compatible" property.
582 * @adev: ACPI device object to match.
583 * @of_match_table: List of device IDs to match against.
584 *
585 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
586 * identifiers and a _DSD object with the "compatible" property, use that
587 * property to match against the given list of identifiers.
588 */
589static bool acpi_of_match_device(struct acpi_device *adev,
590 const struct of_device_id *of_match_table)
591{
592 const union acpi_object *of_compatible, *obj;
593 int i, nval;
594
595 if (!adev)
596 return false;
597
598 of_compatible = adev->data.of_compatible;
599 if (!of_match_table || !of_compatible)
600 return false;
601
602 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
603 nval = of_compatible->package.count;
604 obj = of_compatible->package.elements;
605 } else { /* Must be ACPI_TYPE_STRING. */
606 nval = 1;
607 obj = of_compatible;
608 }
609 /* Now we can look for the driver DT compatible strings */
610 for (i = 0; i < nval; i++, obj++) {
611 const struct of_device_id *id;
612
613 for (id = of_match_table; id->compatible[0]; id++)
614 if (!strcasecmp(obj->string.pointer, id->compatible))
615 return true;
616 }
617
618 return false;
619}
620
621static bool __acpi_match_device_cls(const struct acpi_device_id *id,
622 struct acpi_hardware_id *hwid)
623{
624 int i, msk, byte_shift;
625 char buf[3];
626
627 if (!id->cls)
628 return false;
629
630 /* Apply class-code bitmask, before checking each class-code byte */
631 for (i = 1; i <= 3; i++) {
632 byte_shift = 8 * (3 - i);
633 msk = (id->cls_msk >> byte_shift) & 0xFF;
634 if (!msk)
635 continue;
636
637 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
638 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
639 return false;
640 }
641 return true;
642}
643
644static const struct acpi_device_id *__acpi_match_device(
645 struct acpi_device *device,
646 const struct acpi_device_id *ids,
647 const struct of_device_id *of_ids)
648{
649 const struct acpi_device_id *id;
650 struct acpi_hardware_id *hwid;
651
652 /*
653 * If the device is not present, it is unnecessary to load device
654 * driver for it.
655 */
656 if (!device || !device->status.present)
657 return NULL;
658
659 list_for_each_entry(hwid, &device->pnp.ids, list) {
660 /* First, check the ACPI/PNP IDs provided by the caller. */
661 for (id = ids; id->id[0] || id->cls; id++) {
662 if (id->id[0] && !strcmp((char *) id->id, hwid->id))
663 return id;
664 else if (id->cls && __acpi_match_device_cls(id, hwid))
665 return id;
666 }
667
668 /*
669 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
670 * "compatible" property if found.
671 *
672 * The id returned by the below is not valid, but the only
673 * caller passing non-NULL of_ids here is only interested in
674 * whether or not the return value is NULL.
675 */
676 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
677 && acpi_of_match_device(device, of_ids))
678 return id;
679 }
680 return NULL;
681}
682
683/**
684 * acpi_match_device - Match a struct device against a given list of ACPI IDs
685 * @ids: Array of struct acpi_device_id object to match against.
686 * @dev: The device structure to match.
687 *
688 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
689 * object for that handle and use that object to match against a given list of
690 * device IDs.
691 *
692 * Return a pointer to the first matching ID on success or %NULL on failure.
693 */
694const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
695 const struct device *dev)
696{
697 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
698}
699EXPORT_SYMBOL_GPL(acpi_match_device);
700
701int acpi_match_device_ids(struct acpi_device *device,
702 const struct acpi_device_id *ids)
703{
704 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
705}
706EXPORT_SYMBOL(acpi_match_device_ids);
707
708bool acpi_driver_match_device(struct device *dev,
709 const struct device_driver *drv)
710{
711 if (!drv->acpi_match_table)
712 return acpi_of_match_device(ACPI_COMPANION(dev),
713 drv->of_match_table);
714
715 return !!__acpi_match_device(acpi_companion_match(dev),
716 drv->acpi_match_table, drv->of_match_table);
717}
718EXPORT_SYMBOL_GPL(acpi_driver_match_device);
719
720/* --------------------------------------------------------------------------
721 ACPI Driver Management
722 -------------------------------------------------------------------------- */
723
724/**
725 * acpi_bus_register_driver - register a driver with the ACPI bus
726 * @driver: driver being registered
727 *
728 * Registers a driver with the ACPI bus. Searches the namespace for all
729 * devices that match the driver's criteria and binds. Returns zero for
730 * success or a negative error status for failure.
731 */
732int acpi_bus_register_driver(struct acpi_driver *driver)
733{
734 int ret;
735
736 if (acpi_disabled)
737 return -ENODEV;
738 driver->drv.name = driver->name;
739 driver->drv.bus = &acpi_bus_type;
740 driver->drv.owner = driver->owner;
741
742 ret = driver_register(&driver->drv);
743 return ret;
744}
745
746EXPORT_SYMBOL(acpi_bus_register_driver);
747
748/**
749 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
750 * @driver: driver to unregister
751 *
752 * Unregisters a driver with the ACPI bus. Searches the namespace for all
753 * devices that match the driver's criteria and unbinds.
754 */
755void acpi_bus_unregister_driver(struct acpi_driver *driver)
756{
757 driver_unregister(&driver->drv);
758}
759
760EXPORT_SYMBOL(acpi_bus_unregister_driver);
761
762/* --------------------------------------------------------------------------
763 ACPI Bus operations
764 -------------------------------------------------------------------------- */
765
766static int acpi_bus_match(struct device *dev, struct device_driver *drv)
767{
768 struct acpi_device *acpi_dev = to_acpi_device(dev);
769 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
770
771 return acpi_dev->flags.match_driver
772 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
773}
774
775static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
776{
777 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
778}
779
780static int acpi_device_probe(struct device *dev)
781{
782 struct acpi_device *acpi_dev = to_acpi_device(dev);
783 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
784 int ret;
785
786 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
787 return -EINVAL;
788
789 if (!acpi_drv->ops.add)
790 return -ENOSYS;
791
792 ret = acpi_drv->ops.add(acpi_dev);
793 if (ret)
794 return ret;
795
796 acpi_dev->driver = acpi_drv;
797 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
798 "Driver [%s] successfully bound to device [%s]\n",
799 acpi_drv->name, acpi_dev->pnp.bus_id));
800
801 if (acpi_drv->ops.notify) {
802 ret = acpi_device_install_notify_handler(acpi_dev);
803 if (ret) {
804 if (acpi_drv->ops.remove)
805 acpi_drv->ops.remove(acpi_dev);
806
807 acpi_dev->driver = NULL;
808 acpi_dev->driver_data = NULL;
809 return ret;
810 }
811 }
812
813 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
814 acpi_drv->name, acpi_dev->pnp.bus_id));
815 get_device(dev);
816 return 0;
817}
818
819static int acpi_device_remove(struct device * dev)
820{
821 struct acpi_device *acpi_dev = to_acpi_device(dev);
822 struct acpi_driver *acpi_drv = acpi_dev->driver;
823
824 if (acpi_drv) {
825 if (acpi_drv->ops.notify)
826 acpi_device_remove_notify_handler(acpi_dev);
827 if (acpi_drv->ops.remove)
828 acpi_drv->ops.remove(acpi_dev);
829 }
830 acpi_dev->driver = NULL;
831 acpi_dev->driver_data = NULL;
832
833 put_device(dev);
834 return 0;
835}
836
837struct bus_type acpi_bus_type = {
838 .name = "acpi",
839 .match = acpi_bus_match,
840 .probe = acpi_device_probe,
841 .remove = acpi_device_remove,
842 .uevent = acpi_device_uevent,
843};
844
845/* --------------------------------------------------------------------------
846 Initialization/Cleanup
847 -------------------------------------------------------------------------- */
848
849static int __init acpi_bus_init_irq(void)
850{
851 acpi_status status;
852 char *message = NULL;
853
854
855 /*
856 * Let the system know what interrupt model we are using by
857 * evaluating the \_PIC object, if exists.
858 */
859
860 switch (acpi_irq_model) {
861 case ACPI_IRQ_MODEL_PIC:
862 message = "PIC";
863 break;
864 case ACPI_IRQ_MODEL_IOAPIC:
865 message = "IOAPIC";
866 break;
867 case ACPI_IRQ_MODEL_IOSAPIC:
868 message = "IOSAPIC";
869 break;
870 case ACPI_IRQ_MODEL_GIC:
871 message = "GIC";
872 break;
873 case ACPI_IRQ_MODEL_PLATFORM:
874 message = "platform specific model";
875 break;
876 default:
877 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
878 return -ENODEV;
879 }
880
881 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
882
883 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
884 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
885 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
886 return -ENODEV;
887 }
888
889 return 0;
890}
891
892/**
893 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
894 *
895 * The ACPI tables are accessible after this, but the handling of events has not
896 * been initialized and the global lock is not available yet, so AML should not
897 * be executed at this point.
898 *
899 * Doing this before switching the EFI runtime services to virtual mode allows
900 * the EfiBootServices memory to be freed slightly earlier on boot.
901 */
902void __init acpi_early_init(void)
903{
904 acpi_status status;
905
906 if (acpi_disabled)
907 return;
908
909 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
910
911 /* It's safe to verify table checksums during late stage */
912 acpi_gbl_verify_table_checksum = TRUE;
913
914 /* enable workarounds, unless strict ACPI spec. compliance */
915 if (!acpi_strict)
916 acpi_gbl_enable_interpreter_slack = TRUE;
917
918 acpi_gbl_permanent_mmap = 1;
919
920 /*
921 * If the machine falls into the DMI check table,
922 * DSDT will be copied to memory
923 */
924 dmi_check_system(dsdt_dmi_table);
925
926 status = acpi_reallocate_root_table();
927 if (ACPI_FAILURE(status)) {
928 printk(KERN_ERR PREFIX
929 "Unable to reallocate ACPI tables\n");
930 goto error0;
931 }
932
933 status = acpi_initialize_subsystem();
934 if (ACPI_FAILURE(status)) {
935 printk(KERN_ERR PREFIX
936 "Unable to initialize the ACPI Interpreter\n");
937 goto error0;
938 }
939
940 if (acpi_gbl_group_module_level_code) {
941 status = acpi_load_tables();
942 if (ACPI_FAILURE(status)) {
943 printk(KERN_ERR PREFIX
944 "Unable to load the System Description Tables\n");
945 goto error0;
946 }
947 }
948
949#ifdef CONFIG_X86
950 if (!acpi_ioapic) {
951 /* compatible (0) means level (3) */
952 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
953 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
954 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
955 }
956 /* Set PIC-mode SCI trigger type */
957 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
958 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
959 } else {
960 /*
961 * now that acpi_gbl_FADT is initialized,
962 * update it with result from INT_SRC_OVR parsing
963 */
964 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
965 }
966#endif
967 return;
968
969 error0:
970 disable_acpi();
971}
972
973/**
974 * acpi_subsystem_init - Finalize the early initialization of ACPI.
975 *
976 * Switch over the platform to the ACPI mode (if possible), initialize the
977 * handling of ACPI events, install the interrupt and global lock handlers.
978 *
979 * Doing this too early is generally unsafe, but at the same time it needs to be
980 * done before all things that really depend on ACPI. The right spot appears to
981 * be before finalizing the EFI initialization.
982 */
983void __init acpi_subsystem_init(void)
984{
985 acpi_status status;
986
987 if (acpi_disabled)
988 return;
989
990 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
991 if (ACPI_FAILURE(status)) {
992 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
993 disable_acpi();
994 } else {
995 /*
996 * If the system is using ACPI then we can be reasonably
997 * confident that any regulators are managed by the firmware
998 * so tell the regulator core it has everything it needs to
999 * know.
1000 */
1001 regulator_has_full_constraints();
1002 }
1003}
1004
1005static int __init acpi_bus_init(void)
1006{
1007 int result;
1008 acpi_status status;
1009
1010 acpi_os_initialize1();
1011
1012 /*
1013 * ACPI 2.0 requires the EC driver to be loaded and work before
1014 * the EC device is found in the namespace (i.e. before
1015 * acpi_load_tables() is called).
1016 *
1017 * This is accomplished by looking for the ECDT table, and getting
1018 * the EC parameters out of that.
1019 */
1020 status = acpi_ec_ecdt_probe();
1021 /* Ignore result. Not having an ECDT is not fatal. */
1022
1023 if (!acpi_gbl_group_module_level_code) {
1024 status = acpi_load_tables();
1025 if (ACPI_FAILURE(status)) {
1026 printk(KERN_ERR PREFIX
1027 "Unable to load the System Description Tables\n");
1028 goto error1;
1029 }
1030 }
1031
1032 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1033 if (ACPI_FAILURE(status)) {
1034 printk(KERN_ERR PREFIX
1035 "Unable to start the ACPI Interpreter\n");
1036 goto error1;
1037 }
1038
1039 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1040 if (ACPI_FAILURE(status)) {
1041 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1042 goto error1;
1043 }
1044
1045 /* Set capability bits for _OSC under processor scope */
1046 acpi_early_processor_osc();
1047
1048 /*
1049 * _OSC method may exist in module level code,
1050 * so it must be run after ACPI_FULL_INITIALIZATION
1051 */
1052 acpi_bus_osc_support();
1053
1054 /*
1055 * _PDC control method may load dynamic SSDT tables,
1056 * and we need to install the table handler before that.
1057 */
1058 acpi_sysfs_init();
1059
1060 acpi_early_processor_set_pdc();
1061
1062 /*
1063 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1064 * is necessary to enable it as early as possible.
1065 */
1066 acpi_ec_dsdt_probe();
1067
1068 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1069
1070 /* Initialize sleep structures */
1071 acpi_sleep_init();
1072
1073 /*
1074 * Get the system interrupt model and evaluate \_PIC.
1075 */
1076 result = acpi_bus_init_irq();
1077 if (result)
1078 goto error1;
1079
1080 /*
1081 * Register the for all standard device notifications.
1082 */
1083 status =
1084 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1085 &acpi_bus_notify, NULL);
1086 if (ACPI_FAILURE(status)) {
1087 printk(KERN_ERR PREFIX
1088 "Unable to register for device notifications\n");
1089 goto error1;
1090 }
1091
1092 /*
1093 * Create the top ACPI proc directory
1094 */
1095 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1096
1097 result = bus_register(&acpi_bus_type);
1098 if (!result)
1099 return 0;
1100
1101 /* Mimic structured exception handling */
1102 error1:
1103 acpi_terminate();
1104 return -ENODEV;
1105}
1106
1107struct kobject *acpi_kobj;
1108EXPORT_SYMBOL_GPL(acpi_kobj);
1109
1110static int __init acpi_init(void)
1111{
1112 int result;
1113
1114 if (acpi_disabled) {
1115 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1116 return -ENODEV;
1117 }
1118
1119 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1120 if (!acpi_kobj) {
1121 printk(KERN_WARNING "%s: kset create error\n", __func__);
1122 acpi_kobj = NULL;
1123 }
1124
1125 init_acpi_device_notify();
1126 result = acpi_bus_init();
1127 if (result) {
1128 disable_acpi();
1129 return result;
1130 }
1131
1132 pci_mmcfg_late_init();
1133 acpi_scan_init();
1134 acpi_ec_init();
1135 acpi_debugfs_init();
1136 acpi_sleep_proc_init();
1137 acpi_wakeup_device_init();
1138 acpi_debugger_init();
1139 return 0;
1140}
1141
1142subsys_initcall(acpi_init);
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