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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 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
28#include <linux/kernel.h>
29#include <linux/list.h>
30#include <linux/sched.h>
31#include <linux/pm.h>
32#include <linux/device.h>
33#include <linux/proc_fs.h>
34#include <linux/acpi.h>
35#include <linux/slab.h>
36#ifdef CONFIG_X86
37#include <asm/mpspec.h>
38#endif
39#include <linux/pci.h>
40#include <acpi/acpi_bus.h>
41#include <acpi/acpi_drivers.h>
42#include <acpi/apei.h>
43#include <linux/dmi.h>
44#include <linux/suspend.h>
45
46#include "internal.h"
47
48#define _COMPONENT ACPI_BUS_COMPONENT
49ACPI_MODULE_NAME("bus");
50
51struct acpi_device *acpi_root;
52struct proc_dir_entry *acpi_root_dir;
53EXPORT_SYMBOL(acpi_root_dir);
54
55#define STRUCT_TO_INT(s) (*((int*)&s))
56
57
58#ifdef CONFIG_X86
59static int set_copy_dsdt(const struct dmi_system_id *id)
60{
61 printk(KERN_NOTICE "%s detected - "
62 "force copy of DSDT to local memory\n", id->ident);
63 acpi_gbl_copy_dsdt_locally = 1;
64 return 0;
65}
66
67static struct dmi_system_id dsdt_dmi_table[] __initdata = {
68 /*
69 * Invoke DSDT corruption work-around on all Toshiba Satellite.
70 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
71 */
72 {
73 .callback = set_copy_dsdt,
74 .ident = "TOSHIBA Satellite",
75 .matches = {
76 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
77 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
78 },
79 },
80 {}
81};
82#else
83static struct dmi_system_id dsdt_dmi_table[] __initdata = {
84 {}
85};
86#endif
87
88/* --------------------------------------------------------------------------
89 Device Management
90 -------------------------------------------------------------------------- */
91
92int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
93{
94 acpi_status status = AE_OK;
95
96
97 if (!device)
98 return -EINVAL;
99
100 /* TBD: Support fixed-feature devices */
101
102 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
103 if (ACPI_FAILURE(status) || !*device) {
104 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
105 handle));
106 return -ENODEV;
107 }
108
109 return 0;
110}
111
112EXPORT_SYMBOL(acpi_bus_get_device);
113
114acpi_status acpi_bus_get_status_handle(acpi_handle handle,
115 unsigned long long *sta)
116{
117 acpi_status status;
118
119 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
120 if (ACPI_SUCCESS(status))
121 return AE_OK;
122
123 if (status == AE_NOT_FOUND) {
124 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
125 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
126 return AE_OK;
127 }
128 return status;
129}
130
131int acpi_bus_get_status(struct acpi_device *device)
132{
133 acpi_status status;
134 unsigned long long sta;
135
136 status = acpi_bus_get_status_handle(device->handle, &sta);
137 if (ACPI_FAILURE(status))
138 return -ENODEV;
139
140 STRUCT_TO_INT(device->status) = (int) sta;
141
142 if (device->status.functional && !device->status.present) {
143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
144 "functional but not present;\n",
145 device->pnp.bus_id,
146 (u32) STRUCT_TO_INT(device->status)));
147 }
148
149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
150 device->pnp.bus_id,
151 (u32) STRUCT_TO_INT(device->status)));
152 return 0;
153}
154EXPORT_SYMBOL(acpi_bus_get_status);
155
156void acpi_bus_private_data_handler(acpi_handle handle,
157 void *context)
158{
159 return;
160}
161EXPORT_SYMBOL(acpi_bus_private_data_handler);
162
163int acpi_bus_get_private_data(acpi_handle handle, void **data)
164{
165 acpi_status status = AE_OK;
166
167 if (!*data)
168 return -EINVAL;
169
170 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
171 if (ACPI_FAILURE(status) || !*data) {
172 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
173 handle));
174 return -ENODEV;
175 }
176
177 return 0;
178}
179EXPORT_SYMBOL(acpi_bus_get_private_data);
180
181/* --------------------------------------------------------------------------
182 Power Management
183 -------------------------------------------------------------------------- */
184
185static int __acpi_bus_get_power(struct acpi_device *device, int *state)
186{
187 int result = 0;
188 acpi_status status = 0;
189 unsigned long long psc = 0;
190
191 if (!device || !state)
192 return -EINVAL;
193
194 *state = ACPI_STATE_UNKNOWN;
195
196 if (device->flags.power_manageable) {
197 /*
198 * Get the device's power state either directly (via _PSC) or
199 * indirectly (via power resources).
200 */
201 if (device->power.flags.power_resources) {
202 result = acpi_power_get_inferred_state(device, state);
203 if (result)
204 return result;
205 } else if (device->power.flags.explicit_get) {
206 status = acpi_evaluate_integer(device->handle, "_PSC",
207 NULL, &psc);
208 if (ACPI_FAILURE(status))
209 return -ENODEV;
210 *state = (int)psc;
211 }
212 } else {
213 /* TBD: Non-recursive algorithm for walking up hierarchy. */
214 *state = device->parent ?
215 device->parent->power.state : ACPI_STATE_D0;
216 }
217
218 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
219 device->pnp.bus_id, *state));
220
221 return 0;
222}
223
224
225static int __acpi_bus_set_power(struct acpi_device *device, int state)
226{
227 int result = 0;
228 acpi_status status = AE_OK;
229 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
230
231 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
232 return -EINVAL;
233
234 /* Make sure this is a valid target state */
235
236 if (state == device->power.state) {
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
238 state));
239 return 0;
240 }
241
242 if (!device->power.states[state].flags.valid) {
243 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
244 return -ENODEV;
245 }
246 if (device->parent && (state < device->parent->power.state)) {
247 printk(KERN_WARNING PREFIX
248 "Cannot set device to a higher-powered"
249 " state than parent\n");
250 return -ENODEV;
251 }
252
253 /*
254 * Transition Power
255 * ----------------
256 * On transitions to a high-powered state we first apply power (via
257 * power resources) then evalute _PSx. Conversly for transitions to
258 * a lower-powered state.
259 */
260 if (state < device->power.state) {
261 if (device->power.flags.power_resources) {
262 result = acpi_power_transition(device, state);
263 if (result)
264 goto end;
265 }
266 if (device->power.states[state].flags.explicit_set) {
267 status = acpi_evaluate_object(device->handle,
268 object_name, NULL, NULL);
269 if (ACPI_FAILURE(status)) {
270 result = -ENODEV;
271 goto end;
272 }
273 }
274 } else {
275 if (device->power.states[state].flags.explicit_set) {
276 status = acpi_evaluate_object(device->handle,
277 object_name, NULL, NULL);
278 if (ACPI_FAILURE(status)) {
279 result = -ENODEV;
280 goto end;
281 }
282 }
283 if (device->power.flags.power_resources) {
284 result = acpi_power_transition(device, state);
285 if (result)
286 goto end;
287 }
288 }
289
290 end:
291 if (result)
292 printk(KERN_WARNING PREFIX
293 "Device [%s] failed to transition to D%d\n",
294 device->pnp.bus_id, state);
295 else {
296 device->power.state = state;
297 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
298 "Device [%s] transitioned to D%d\n",
299 device->pnp.bus_id, state));
300 }
301
302 return result;
303}
304
305
306int acpi_bus_set_power(acpi_handle handle, int state)
307{
308 struct acpi_device *device;
309 int result;
310
311 result = acpi_bus_get_device(handle, &device);
312 if (result)
313 return result;
314
315 if (!device->flags.power_manageable) {
316 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
317 "Device [%s] is not power manageable\n",
318 dev_name(&device->dev)));
319 return -ENODEV;
320 }
321
322 return __acpi_bus_set_power(device, state);
323}
324EXPORT_SYMBOL(acpi_bus_set_power);
325
326
327int acpi_bus_init_power(struct acpi_device *device)
328{
329 int state;
330 int result;
331
332 if (!device)
333 return -EINVAL;
334
335 device->power.state = ACPI_STATE_UNKNOWN;
336
337 result = __acpi_bus_get_power(device, &state);
338 if (result)
339 return result;
340
341 if (device->power.flags.power_resources)
342 result = acpi_power_on_resources(device, state);
343
344 if (!result)
345 device->power.state = state;
346
347 return result;
348}
349
350
351int acpi_bus_update_power(acpi_handle handle, int *state_p)
352{
353 struct acpi_device *device;
354 int state;
355 int result;
356
357 result = acpi_bus_get_device(handle, &device);
358 if (result)
359 return result;
360
361 result = __acpi_bus_get_power(device, &state);
362 if (result)
363 return result;
364
365 result = __acpi_bus_set_power(device, state);
366 if (!result && state_p)
367 *state_p = state;
368
369 return result;
370}
371EXPORT_SYMBOL_GPL(acpi_bus_update_power);
372
373
374bool acpi_bus_power_manageable(acpi_handle handle)
375{
376 struct acpi_device *device;
377 int result;
378
379 result = acpi_bus_get_device(handle, &device);
380 return result ? false : device->flags.power_manageable;
381}
382
383EXPORT_SYMBOL(acpi_bus_power_manageable);
384
385bool acpi_bus_can_wakeup(acpi_handle handle)
386{
387 struct acpi_device *device;
388 int result;
389
390 result = acpi_bus_get_device(handle, &device);
391 return result ? false : device->wakeup.flags.valid;
392}
393
394EXPORT_SYMBOL(acpi_bus_can_wakeup);
395
396static void acpi_print_osc_error(acpi_handle handle,
397 struct acpi_osc_context *context, char *error)
398{
399 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
400 int i;
401
402 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
403 printk(KERN_DEBUG "%s\n", error);
404 else {
405 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
406 kfree(buffer.pointer);
407 }
408 printk(KERN_DEBUG"_OSC request data:");
409 for (i = 0; i < context->cap.length; i += sizeof(u32))
410 printk("%x ", *((u32 *)(context->cap.pointer + i)));
411 printk("\n");
412}
413
414static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
415{
416 int i;
417 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
418 24, 26, 28, 30, 32, 34};
419
420 if (strlen(str) != 36)
421 return AE_BAD_PARAMETER;
422 for (i = 0; i < 36; i++) {
423 if (i == 8 || i == 13 || i == 18 || i == 23) {
424 if (str[i] != '-')
425 return AE_BAD_PARAMETER;
426 } else if (!isxdigit(str[i]))
427 return AE_BAD_PARAMETER;
428 }
429 for (i = 0; i < 16; i++) {
430 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
431 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
432 }
433 return AE_OK;
434}
435
436acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
437{
438 acpi_status status;
439 struct acpi_object_list input;
440 union acpi_object in_params[4];
441 union acpi_object *out_obj;
442 u8 uuid[16];
443 u32 errors;
444 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
445
446 if (!context)
447 return AE_ERROR;
448 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
449 return AE_ERROR;
450 context->ret.length = ACPI_ALLOCATE_BUFFER;
451 context->ret.pointer = NULL;
452
453 /* Setting up input parameters */
454 input.count = 4;
455 input.pointer = in_params;
456 in_params[0].type = ACPI_TYPE_BUFFER;
457 in_params[0].buffer.length = 16;
458 in_params[0].buffer.pointer = uuid;
459 in_params[1].type = ACPI_TYPE_INTEGER;
460 in_params[1].integer.value = context->rev;
461 in_params[2].type = ACPI_TYPE_INTEGER;
462 in_params[2].integer.value = context->cap.length/sizeof(u32);
463 in_params[3].type = ACPI_TYPE_BUFFER;
464 in_params[3].buffer.length = context->cap.length;
465 in_params[3].buffer.pointer = context->cap.pointer;
466
467 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
468 if (ACPI_FAILURE(status))
469 return status;
470
471 if (!output.length)
472 return AE_NULL_OBJECT;
473
474 out_obj = output.pointer;
475 if (out_obj->type != ACPI_TYPE_BUFFER
476 || out_obj->buffer.length != context->cap.length) {
477 acpi_print_osc_error(handle, context,
478 "_OSC evaluation returned wrong type");
479 status = AE_TYPE;
480 goto out_kfree;
481 }
482 /* Need to ignore the bit0 in result code */
483 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
484 if (errors) {
485 if (errors & OSC_REQUEST_ERROR)
486 acpi_print_osc_error(handle, context,
487 "_OSC request failed");
488 if (errors & OSC_INVALID_UUID_ERROR)
489 acpi_print_osc_error(handle, context,
490 "_OSC invalid UUID");
491 if (errors & OSC_INVALID_REVISION_ERROR)
492 acpi_print_osc_error(handle, context,
493 "_OSC invalid revision");
494 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
495 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
496 & OSC_QUERY_ENABLE)
497 goto out_success;
498 status = AE_SUPPORT;
499 goto out_kfree;
500 }
501 status = AE_ERROR;
502 goto out_kfree;
503 }
504out_success:
505 context->ret.length = out_obj->buffer.length;
506 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
507 if (!context->ret.pointer) {
508 status = AE_NO_MEMORY;
509 goto out_kfree;
510 }
511 memcpy(context->ret.pointer, out_obj->buffer.pointer,
512 context->ret.length);
513 status = AE_OK;
514
515out_kfree:
516 kfree(output.pointer);
517 if (status != AE_OK)
518 context->ret.pointer = NULL;
519 return status;
520}
521EXPORT_SYMBOL(acpi_run_osc);
522
523bool osc_sb_apei_support_acked;
524static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
525static void acpi_bus_osc_support(void)
526{
527 u32 capbuf[2];
528 struct acpi_osc_context context = {
529 .uuid_str = sb_uuid_str,
530 .rev = 1,
531 .cap.length = 8,
532 .cap.pointer = capbuf,
533 };
534 acpi_handle handle;
535
536 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
537 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
538#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
539 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
540 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
541#endif
542
543#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
544 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
545#endif
546
547 if (!ghes_disable)
548 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
549 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
550 return;
551 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
552 u32 *capbuf_ret = context.ret.pointer;
553 if (context.ret.length > OSC_SUPPORT_TYPE)
554 osc_sb_apei_support_acked =
555 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
556 kfree(context.ret.pointer);
557 }
558 /* do we need to check other returned cap? Sounds no */
559}
560
561/* --------------------------------------------------------------------------
562 Event Management
563 -------------------------------------------------------------------------- */
564
565#ifdef CONFIG_ACPI_PROC_EVENT
566static DEFINE_SPINLOCK(acpi_bus_event_lock);
567
568LIST_HEAD(acpi_bus_event_list);
569DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
570
571extern int event_is_open;
572
573int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
574{
575 struct acpi_bus_event *event;
576 unsigned long flags = 0;
577
578 /* drop event on the floor if no one's listening */
579 if (!event_is_open)
580 return 0;
581
582 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
583 if (!event)
584 return -ENOMEM;
585
586 strcpy(event->device_class, device_class);
587 strcpy(event->bus_id, bus_id);
588 event->type = type;
589 event->data = data;
590
591 spin_lock_irqsave(&acpi_bus_event_lock, flags);
592 list_add_tail(&event->node, &acpi_bus_event_list);
593 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
594
595 wake_up_interruptible(&acpi_bus_event_queue);
596
597 return 0;
598
599}
600
601EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
602
603int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
604{
605 if (!device)
606 return -EINVAL;
607 return acpi_bus_generate_proc_event4(device->pnp.device_class,
608 device->pnp.bus_id, type, data);
609}
610
611EXPORT_SYMBOL(acpi_bus_generate_proc_event);
612
613int acpi_bus_receive_event(struct acpi_bus_event *event)
614{
615 unsigned long flags = 0;
616 struct acpi_bus_event *entry = NULL;
617
618 DECLARE_WAITQUEUE(wait, current);
619
620
621 if (!event)
622 return -EINVAL;
623
624 if (list_empty(&acpi_bus_event_list)) {
625
626 set_current_state(TASK_INTERRUPTIBLE);
627 add_wait_queue(&acpi_bus_event_queue, &wait);
628
629 if (list_empty(&acpi_bus_event_list))
630 schedule();
631
632 remove_wait_queue(&acpi_bus_event_queue, &wait);
633 set_current_state(TASK_RUNNING);
634
635 if (signal_pending(current))
636 return -ERESTARTSYS;
637 }
638
639 spin_lock_irqsave(&acpi_bus_event_lock, flags);
640 if (!list_empty(&acpi_bus_event_list)) {
641 entry = list_entry(acpi_bus_event_list.next,
642 struct acpi_bus_event, node);
643 list_del(&entry->node);
644 }
645 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
646
647 if (!entry)
648 return -ENODEV;
649
650 memcpy(event, entry, sizeof(struct acpi_bus_event));
651
652 kfree(entry);
653
654 return 0;
655}
656
657#endif /* CONFIG_ACPI_PROC_EVENT */
658
659/* --------------------------------------------------------------------------
660 Notification Handling
661 -------------------------------------------------------------------------- */
662
663static void acpi_bus_check_device(acpi_handle handle)
664{
665 struct acpi_device *device;
666 acpi_status status;
667 struct acpi_device_status old_status;
668
669 if (acpi_bus_get_device(handle, &device))
670 return;
671 if (!device)
672 return;
673
674 old_status = device->status;
675
676 /*
677 * Make sure this device's parent is present before we go about
678 * messing with the device.
679 */
680 if (device->parent && !device->parent->status.present) {
681 device->status = device->parent->status;
682 return;
683 }
684
685 status = acpi_bus_get_status(device);
686 if (ACPI_FAILURE(status))
687 return;
688
689 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
690 return;
691
692 /*
693 * Device Insertion/Removal
694 */
695 if ((device->status.present) && !(old_status.present)) {
696 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
697 /* TBD: Handle device insertion */
698 } else if (!(device->status.present) && (old_status.present)) {
699 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
700 /* TBD: Handle device removal */
701 }
702}
703
704static void acpi_bus_check_scope(acpi_handle handle)
705{
706 /* Status Change? */
707 acpi_bus_check_device(handle);
708
709 /*
710 * TBD: Enumerate child devices within this device's scope and
711 * run acpi_bus_check_device()'s on them.
712 */
713}
714
715static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
716int register_acpi_bus_notifier(struct notifier_block *nb)
717{
718 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
719}
720EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
721
722void unregister_acpi_bus_notifier(struct notifier_block *nb)
723{
724 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
725}
726EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
727
728/**
729 * acpi_bus_notify
730 * ---------------
731 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
732 */
733static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
734{
735 struct acpi_device *device = NULL;
736 struct acpi_driver *driver;
737
738 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
739 type, handle));
740
741 blocking_notifier_call_chain(&acpi_bus_notify_list,
742 type, (void *)handle);
743
744 switch (type) {
745
746 case ACPI_NOTIFY_BUS_CHECK:
747 acpi_bus_check_scope(handle);
748 /*
749 * TBD: We'll need to outsource certain events to non-ACPI
750 * drivers via the device manager (device.c).
751 */
752 break;
753
754 case ACPI_NOTIFY_DEVICE_CHECK:
755 acpi_bus_check_device(handle);
756 /*
757 * TBD: We'll need to outsource certain events to non-ACPI
758 * drivers via the device manager (device.c).
759 */
760 break;
761
762 case ACPI_NOTIFY_DEVICE_WAKE:
763 /* TBD */
764 break;
765
766 case ACPI_NOTIFY_EJECT_REQUEST:
767 /* TBD */
768 break;
769
770 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
771 /* TBD: Exactly what does 'light' mean? */
772 break;
773
774 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
775 /* TBD */
776 break;
777
778 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
779 /* TBD */
780 break;
781
782 case ACPI_NOTIFY_POWER_FAULT:
783 /* TBD */
784 break;
785
786 default:
787 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
788 "Received unknown/unsupported notification [%08x]\n",
789 type));
790 break;
791 }
792
793 acpi_bus_get_device(handle, &device);
794 if (device) {
795 driver = device->driver;
796 if (driver && driver->ops.notify &&
797 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
798 driver->ops.notify(device, type);
799 }
800}
801
802/* --------------------------------------------------------------------------
803 Initialization/Cleanup
804 -------------------------------------------------------------------------- */
805
806static int __init acpi_bus_init_irq(void)
807{
808 acpi_status status = AE_OK;
809 union acpi_object arg = { ACPI_TYPE_INTEGER };
810 struct acpi_object_list arg_list = { 1, &arg };
811 char *message = NULL;
812
813
814 /*
815 * Let the system know what interrupt model we are using by
816 * evaluating the \_PIC object, if exists.
817 */
818
819 switch (acpi_irq_model) {
820 case ACPI_IRQ_MODEL_PIC:
821 message = "PIC";
822 break;
823 case ACPI_IRQ_MODEL_IOAPIC:
824 message = "IOAPIC";
825 break;
826 case ACPI_IRQ_MODEL_IOSAPIC:
827 message = "IOSAPIC";
828 break;
829 case ACPI_IRQ_MODEL_PLATFORM:
830 message = "platform specific model";
831 break;
832 default:
833 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
834 return -ENODEV;
835 }
836
837 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
838
839 arg.integer.value = acpi_irq_model;
840
841 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
842 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
843 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
844 return -ENODEV;
845 }
846
847 return 0;
848}
849
850u8 acpi_gbl_permanent_mmap;
851
852
853void __init acpi_early_init(void)
854{
855 acpi_status status = AE_OK;
856
857 if (acpi_disabled)
858 return;
859
860 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
861
862 /* enable workarounds, unless strict ACPI spec. compliance */
863 if (!acpi_strict)
864 acpi_gbl_enable_interpreter_slack = TRUE;
865
866 acpi_gbl_permanent_mmap = 1;
867
868 /*
869 * If the machine falls into the DMI check table,
870 * DSDT will be copied to memory
871 */
872 dmi_check_system(dsdt_dmi_table);
873
874 status = acpi_reallocate_root_table();
875 if (ACPI_FAILURE(status)) {
876 printk(KERN_ERR PREFIX
877 "Unable to reallocate ACPI tables\n");
878 goto error0;
879 }
880
881 status = acpi_initialize_subsystem();
882 if (ACPI_FAILURE(status)) {
883 printk(KERN_ERR PREFIX
884 "Unable to initialize the ACPI Interpreter\n");
885 goto error0;
886 }
887
888 status = acpi_load_tables();
889 if (ACPI_FAILURE(status)) {
890 printk(KERN_ERR PREFIX
891 "Unable to load the System Description Tables\n");
892 goto error0;
893 }
894
895#ifdef CONFIG_X86
896 if (!acpi_ioapic) {
897 /* compatible (0) means level (3) */
898 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
899 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
900 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
901 }
902 /* Set PIC-mode SCI trigger type */
903 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
904 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
905 } else {
906 /*
907 * now that acpi_gbl_FADT is initialized,
908 * update it with result from INT_SRC_OVR parsing
909 */
910 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
911 }
912#endif
913
914 status =
915 acpi_enable_subsystem(~
916 (ACPI_NO_HARDWARE_INIT |
917 ACPI_NO_ACPI_ENABLE));
918 if (ACPI_FAILURE(status)) {
919 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
920 goto error0;
921 }
922
923 return;
924
925 error0:
926 disable_acpi();
927 return;
928}
929
930static int __init acpi_bus_init(void)
931{
932 int result = 0;
933 acpi_status status = AE_OK;
934 extern acpi_status acpi_os_initialize1(void);
935
936 acpi_os_initialize1();
937
938 status =
939 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
940 if (ACPI_FAILURE(status)) {
941 printk(KERN_ERR PREFIX
942 "Unable to start the ACPI Interpreter\n");
943 goto error1;
944 }
945
946 /*
947 * ACPI 2.0 requires the EC driver to be loaded and work before
948 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
949 * is called).
950 *
951 * This is accomplished by looking for the ECDT table, and getting
952 * the EC parameters out of that.
953 */
954 status = acpi_ec_ecdt_probe();
955 /* Ignore result. Not having an ECDT is not fatal. */
956
957 acpi_bus_osc_support();
958
959 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
960 if (ACPI_FAILURE(status)) {
961 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
962 goto error1;
963 }
964
965 /*
966 * _PDC control method may load dynamic SSDT tables,
967 * and we need to install the table handler before that.
968 */
969 acpi_sysfs_init();
970
971 acpi_early_processor_set_pdc();
972
973 /*
974 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
975 * is necessary to enable it as early as possible.
976 */
977 acpi_boot_ec_enable();
978
979 printk(KERN_INFO PREFIX "Interpreter enabled\n");
980
981 /* Initialize sleep structures */
982 acpi_sleep_init();
983
984 /*
985 * Get the system interrupt model and evaluate \_PIC.
986 */
987 result = acpi_bus_init_irq();
988 if (result)
989 goto error1;
990
991 /*
992 * Register the for all standard device notifications.
993 */
994 status =
995 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
996 &acpi_bus_notify, NULL);
997 if (ACPI_FAILURE(status)) {
998 printk(KERN_ERR PREFIX
999 "Unable to register for device notifications\n");
1000 goto error1;
1001 }
1002
1003 /*
1004 * Create the top ACPI proc directory
1005 */
1006 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1007
1008 return 0;
1009
1010 /* Mimic structured exception handling */
1011 error1:
1012 acpi_terminate();
1013 return -ENODEV;
1014}
1015
1016struct kobject *acpi_kobj;
1017
1018static int __init acpi_init(void)
1019{
1020 int result;
1021
1022 if (acpi_disabled) {
1023 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1024 return -ENODEV;
1025 }
1026
1027 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1028 if (!acpi_kobj) {
1029 printk(KERN_WARNING "%s: kset create error\n", __func__);
1030 acpi_kobj = NULL;
1031 }
1032
1033 init_acpi_device_notify();
1034 result = acpi_bus_init();
1035 if (result) {
1036 disable_acpi();
1037 return result;
1038 }
1039
1040 pci_mmcfg_late_init();
1041 acpi_scan_init();
1042 acpi_ec_init();
1043 acpi_debugfs_init();
1044 acpi_sleep_proc_init();
1045 acpi_wakeup_device_init();
1046 return 0;
1047}
1048
1049subsys_initcall(acpi_init);
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#include <linux/workqueue.h>
34#include <linux/reboot.h>
35#include <linux/delay.h>
36#ifdef CONFIG_X86
37#include <asm/mpspec.h>
38#endif
39#include <linux/acpi_iort.h>
40#include <linux/pci.h>
41#include <acpi/apei.h>
42#include <linux/dmi.h>
43#include <linux/suspend.h>
44
45#include "internal.h"
46
47#define _COMPONENT ACPI_BUS_COMPONENT
48ACPI_MODULE_NAME("bus");
49
50struct acpi_device *acpi_root;
51struct proc_dir_entry *acpi_root_dir;
52EXPORT_SYMBOL(acpi_root_dir);
53
54#ifdef CONFIG_X86
55#ifdef CONFIG_ACPI_CUSTOM_DSDT
56static inline int set_copy_dsdt(const struct dmi_system_id *id)
57{
58 return 0;
59}
60#else
61static int set_copy_dsdt(const struct dmi_system_id *id)
62{
63 printk(KERN_NOTICE "%s detected - "
64 "force copy of DSDT to local memory\n", id->ident);
65 acpi_gbl_copy_dsdt_locally = 1;
66 return 0;
67}
68#endif
69
70static struct dmi_system_id dsdt_dmi_table[] __initdata = {
71 /*
72 * Invoke DSDT corruption work-around on all Toshiba Satellite.
73 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
74 */
75 {
76 .callback = set_copy_dsdt,
77 .ident = "TOSHIBA Satellite",
78 .matches = {
79 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
80 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
81 },
82 },
83 {}
84};
85#else
86static struct dmi_system_id dsdt_dmi_table[] __initdata = {
87 {}
88};
89#endif
90
91/* --------------------------------------------------------------------------
92 Device Management
93 -------------------------------------------------------------------------- */
94
95acpi_status acpi_bus_get_status_handle(acpi_handle handle,
96 unsigned long long *sta)
97{
98 acpi_status status;
99
100 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
101 if (ACPI_SUCCESS(status))
102 return AE_OK;
103
104 if (status == AE_NOT_FOUND) {
105 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
106 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
107 return AE_OK;
108 }
109 return status;
110}
111
112int acpi_bus_get_status(struct acpi_device *device)
113{
114 acpi_status status;
115 unsigned long long sta;
116
117 status = acpi_bus_get_status_handle(device->handle, &sta);
118 if (ACPI_FAILURE(status))
119 return -ENODEV;
120
121 acpi_set_device_status(device, sta);
122
123 if (device->status.functional && !device->status.present) {
124 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
125 "functional but not present;\n",
126 device->pnp.bus_id, (u32)sta));
127 }
128
129 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
130 device->pnp.bus_id, (u32)sta));
131 return 0;
132}
133EXPORT_SYMBOL(acpi_bus_get_status);
134
135void acpi_bus_private_data_handler(acpi_handle handle,
136 void *context)
137{
138 return;
139}
140EXPORT_SYMBOL(acpi_bus_private_data_handler);
141
142int acpi_bus_attach_private_data(acpi_handle handle, void *data)
143{
144 acpi_status status;
145
146 status = acpi_attach_data(handle,
147 acpi_bus_private_data_handler, data);
148 if (ACPI_FAILURE(status)) {
149 acpi_handle_debug(handle, "Error attaching device data\n");
150 return -ENODEV;
151 }
152
153 return 0;
154}
155EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
156
157int acpi_bus_get_private_data(acpi_handle handle, void **data)
158{
159 acpi_status status;
160
161 if (!*data)
162 return -EINVAL;
163
164 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
165 if (ACPI_FAILURE(status)) {
166 acpi_handle_debug(handle, "No context for object\n");
167 return -ENODEV;
168 }
169
170 return 0;
171}
172EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
173
174void acpi_bus_detach_private_data(acpi_handle handle)
175{
176 acpi_detach_data(handle, acpi_bus_private_data_handler);
177}
178EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
179
180static void acpi_print_osc_error(acpi_handle handle,
181 struct acpi_osc_context *context, char *error)
182{
183 int i;
184
185 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
186
187 pr_debug("_OSC request data:");
188 for (i = 0; i < context->cap.length; i += sizeof(u32))
189 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
190
191 pr_debug("\n");
192}
193
194acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
195{
196 int i;
197 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
198 24, 26, 28, 30, 32, 34};
199
200 if (strlen(str) != 36)
201 return AE_BAD_PARAMETER;
202 for (i = 0; i < 36; i++) {
203 if (i == 8 || i == 13 || i == 18 || i == 23) {
204 if (str[i] != '-')
205 return AE_BAD_PARAMETER;
206 } else if (!isxdigit(str[i]))
207 return AE_BAD_PARAMETER;
208 }
209 for (i = 0; i < 16; i++) {
210 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
211 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
212 }
213 return AE_OK;
214}
215EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
216
217acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
218{
219 acpi_status status;
220 struct acpi_object_list input;
221 union acpi_object in_params[4];
222 union acpi_object *out_obj;
223 u8 uuid[16];
224 u32 errors;
225 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
226
227 if (!context)
228 return AE_ERROR;
229 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
230 return AE_ERROR;
231 context->ret.length = ACPI_ALLOCATE_BUFFER;
232 context->ret.pointer = NULL;
233
234 /* Setting up input parameters */
235 input.count = 4;
236 input.pointer = in_params;
237 in_params[0].type = ACPI_TYPE_BUFFER;
238 in_params[0].buffer.length = 16;
239 in_params[0].buffer.pointer = uuid;
240 in_params[1].type = ACPI_TYPE_INTEGER;
241 in_params[1].integer.value = context->rev;
242 in_params[2].type = ACPI_TYPE_INTEGER;
243 in_params[2].integer.value = context->cap.length/sizeof(u32);
244 in_params[3].type = ACPI_TYPE_BUFFER;
245 in_params[3].buffer.length = context->cap.length;
246 in_params[3].buffer.pointer = context->cap.pointer;
247
248 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
249 if (ACPI_FAILURE(status))
250 return status;
251
252 if (!output.length)
253 return AE_NULL_OBJECT;
254
255 out_obj = output.pointer;
256 if (out_obj->type != ACPI_TYPE_BUFFER
257 || out_obj->buffer.length != context->cap.length) {
258 acpi_print_osc_error(handle, context,
259 "_OSC evaluation returned wrong type");
260 status = AE_TYPE;
261 goto out_kfree;
262 }
263 /* Need to ignore the bit0 in result code */
264 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
265 if (errors) {
266 if (errors & OSC_REQUEST_ERROR)
267 acpi_print_osc_error(handle, context,
268 "_OSC request failed");
269 if (errors & OSC_INVALID_UUID_ERROR)
270 acpi_print_osc_error(handle, context,
271 "_OSC invalid UUID");
272 if (errors & OSC_INVALID_REVISION_ERROR)
273 acpi_print_osc_error(handle, context,
274 "_OSC invalid revision");
275 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
276 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
277 & OSC_QUERY_ENABLE)
278 goto out_success;
279 status = AE_SUPPORT;
280 goto out_kfree;
281 }
282 status = AE_ERROR;
283 goto out_kfree;
284 }
285out_success:
286 context->ret.length = out_obj->buffer.length;
287 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
288 context->ret.length, GFP_KERNEL);
289 if (!context->ret.pointer) {
290 status = AE_NO_MEMORY;
291 goto out_kfree;
292 }
293 status = AE_OK;
294
295out_kfree:
296 kfree(output.pointer);
297 if (status != AE_OK)
298 context->ret.pointer = NULL;
299 return status;
300}
301EXPORT_SYMBOL(acpi_run_osc);
302
303bool osc_sb_apei_support_acked;
304
305/*
306 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
307 * OSPM supports platform coordinated low power idle(LPI) states
308 */
309bool osc_pc_lpi_support_confirmed;
310EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
311
312static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
313static void acpi_bus_osc_support(void)
314{
315 u32 capbuf[2];
316 struct acpi_osc_context context = {
317 .uuid_str = sb_uuid_str,
318 .rev = 1,
319 .cap.length = 8,
320 .cap.pointer = capbuf,
321 };
322 acpi_handle handle;
323
324 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
325 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
326 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
328 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
329 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
330
331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
332 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
333
334#ifdef CONFIG_X86
335 if (boot_cpu_has(X86_FEATURE_HWP)) {
336 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
337 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
338 }
339#endif
340
341 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
342 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
343
344 if (!ghes_disable)
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
346 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
347 return;
348 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
349 u32 *capbuf_ret = context.ret.pointer;
350 if (context.ret.length > OSC_SUPPORT_DWORD) {
351 osc_sb_apei_support_acked =
352 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
353 osc_pc_lpi_support_confirmed =
354 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
355 }
356 kfree(context.ret.pointer);
357 }
358 /* do we need to check other returned cap? Sounds no */
359}
360
361/* --------------------------------------------------------------------------
362 Notification Handling
363 -------------------------------------------------------------------------- */
364
365/**
366 * acpi_bus_notify
367 * ---------------
368 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
369 */
370static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
371{
372 struct acpi_device *adev;
373 struct acpi_driver *driver;
374 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
375 bool hotplug_event = false;
376
377 switch (type) {
378 case ACPI_NOTIFY_BUS_CHECK:
379 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
380 hotplug_event = true;
381 break;
382
383 case ACPI_NOTIFY_DEVICE_CHECK:
384 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
385 hotplug_event = true;
386 break;
387
388 case ACPI_NOTIFY_DEVICE_WAKE:
389 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
390 break;
391
392 case ACPI_NOTIFY_EJECT_REQUEST:
393 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
394 hotplug_event = true;
395 break;
396
397 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
398 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
399 /* TBD: Exactly what does 'light' mean? */
400 break;
401
402 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
403 acpi_handle_err(handle, "Device cannot be configured due "
404 "to a frequency mismatch\n");
405 break;
406
407 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
408 acpi_handle_err(handle, "Device cannot be configured due "
409 "to a bus mode mismatch\n");
410 break;
411
412 case ACPI_NOTIFY_POWER_FAULT:
413 acpi_handle_err(handle, "Device has suffered a power fault\n");
414 break;
415
416 default:
417 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
418 break;
419 }
420
421 adev = acpi_bus_get_acpi_device(handle);
422 if (!adev)
423 goto err;
424
425 driver = adev->driver;
426 if (driver && driver->ops.notify &&
427 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
428 driver->ops.notify(adev, type);
429
430 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
431 return;
432
433 acpi_bus_put_acpi_device(adev);
434 return;
435
436 err:
437 acpi_evaluate_ost(handle, type, ost_code, NULL);
438}
439
440static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
441{
442 struct acpi_device *device = data;
443
444 device->driver->ops.notify(device, event);
445}
446
447static void acpi_device_notify_fixed(void *data)
448{
449 struct acpi_device *device = data;
450
451 /* Fixed hardware devices have no handles */
452 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
453}
454
455static u32 acpi_device_fixed_event(void *data)
456{
457 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
458 return ACPI_INTERRUPT_HANDLED;
459}
460
461static int acpi_device_install_notify_handler(struct acpi_device *device)
462{
463 acpi_status status;
464
465 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
466 status =
467 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
468 acpi_device_fixed_event,
469 device);
470 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
471 status =
472 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
473 acpi_device_fixed_event,
474 device);
475 else
476 status = acpi_install_notify_handler(device->handle,
477 ACPI_DEVICE_NOTIFY,
478 acpi_device_notify,
479 device);
480
481 if (ACPI_FAILURE(status))
482 return -EINVAL;
483 return 0;
484}
485
486static void acpi_device_remove_notify_handler(struct acpi_device *device)
487{
488 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
489 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
490 acpi_device_fixed_event);
491 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
492 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
493 acpi_device_fixed_event);
494 else
495 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
496 acpi_device_notify);
497}
498
499/* Handle events targeting \_SB device (at present only graceful shutdown) */
500
501#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
502#define ACPI_SB_INDICATE_INTERVAL 10000
503
504static void sb_notify_work(struct work_struct *dummy)
505{
506 acpi_handle sb_handle;
507
508 orderly_poweroff(true);
509
510 /*
511 * After initiating graceful shutdown, the ACPI spec requires OSPM
512 * to evaluate _OST method once every 10seconds to indicate that
513 * the shutdown is in progress
514 */
515 acpi_get_handle(NULL, "\\_SB", &sb_handle);
516 while (1) {
517 pr_info("Graceful shutdown in progress.\n");
518 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
519 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
520 msleep(ACPI_SB_INDICATE_INTERVAL);
521 }
522}
523
524static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
525{
526 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
527
528 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
529 if (!work_busy(&acpi_sb_work))
530 schedule_work(&acpi_sb_work);
531 } else
532 pr_warn("event %x is not supported by \\_SB device\n", event);
533}
534
535static int __init acpi_setup_sb_notify_handler(void)
536{
537 acpi_handle sb_handle;
538
539 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
540 return -ENXIO;
541
542 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
543 acpi_sb_notify, NULL)))
544 return -EINVAL;
545
546 return 0;
547}
548
549/* --------------------------------------------------------------------------
550 Device Matching
551 -------------------------------------------------------------------------- */
552
553/**
554 * acpi_get_first_physical_node - Get first physical node of an ACPI device
555 * @adev: ACPI device in question
556 *
557 * Return: First physical node of ACPI device @adev
558 */
559struct device *acpi_get_first_physical_node(struct acpi_device *adev)
560{
561 struct mutex *physical_node_lock = &adev->physical_node_lock;
562 struct device *phys_dev;
563
564 mutex_lock(physical_node_lock);
565 if (list_empty(&adev->physical_node_list)) {
566 phys_dev = NULL;
567 } else {
568 const struct acpi_device_physical_node *node;
569
570 node = list_first_entry(&adev->physical_node_list,
571 struct acpi_device_physical_node, node);
572
573 phys_dev = node->dev;
574 }
575 mutex_unlock(physical_node_lock);
576 return phys_dev;
577}
578
579static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
580 const struct device *dev)
581{
582 const struct device *phys_dev = acpi_get_first_physical_node(adev);
583
584 return phys_dev && phys_dev == dev ? adev : NULL;
585}
586
587/**
588 * acpi_device_is_first_physical_node - Is given dev first physical node
589 * @adev: ACPI companion device
590 * @dev: Physical device to check
591 *
592 * Function checks if given @dev is the first physical devices attached to
593 * the ACPI companion device. This distinction is needed in some cases
594 * where the same companion device is shared between many physical devices.
595 *
596 * Note that the caller have to provide valid @adev pointer.
597 */
598bool acpi_device_is_first_physical_node(struct acpi_device *adev,
599 const struct device *dev)
600{
601 return !!acpi_primary_dev_companion(adev, dev);
602}
603
604/*
605 * acpi_companion_match() - Can we match via ACPI companion device
606 * @dev: Device in question
607 *
608 * Check if the given device has an ACPI companion and if that companion has
609 * a valid list of PNP IDs, and if the device is the first (primary) physical
610 * device associated with it. Return the companion pointer if that's the case
611 * or NULL otherwise.
612 *
613 * If multiple physical devices are attached to a single ACPI companion, we need
614 * to be careful. The usage scenario for this kind of relationship is that all
615 * of the physical devices in question use resources provided by the ACPI
616 * companion. A typical case is an MFD device where all the sub-devices share
617 * the parent's ACPI companion. In such cases we can only allow the primary
618 * (first) physical device to be matched with the help of the companion's PNP
619 * IDs.
620 *
621 * Additional physical devices sharing the ACPI companion can still use
622 * resources available from it but they will be matched normally using functions
623 * provided by their bus types (and analogously for their modalias).
624 */
625struct acpi_device *acpi_companion_match(const struct device *dev)
626{
627 struct acpi_device *adev;
628
629 adev = ACPI_COMPANION(dev);
630 if (!adev)
631 return NULL;
632
633 if (list_empty(&adev->pnp.ids))
634 return NULL;
635
636 return acpi_primary_dev_companion(adev, dev);
637}
638
639/**
640 * acpi_of_match_device - Match device object using the "compatible" property.
641 * @adev: ACPI device object to match.
642 * @of_match_table: List of device IDs to match against.
643 *
644 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
645 * identifiers and a _DSD object with the "compatible" property, use that
646 * property to match against the given list of identifiers.
647 */
648static bool acpi_of_match_device(struct acpi_device *adev,
649 const struct of_device_id *of_match_table)
650{
651 const union acpi_object *of_compatible, *obj;
652 int i, nval;
653
654 if (!adev)
655 return false;
656
657 of_compatible = adev->data.of_compatible;
658 if (!of_match_table || !of_compatible)
659 return false;
660
661 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
662 nval = of_compatible->package.count;
663 obj = of_compatible->package.elements;
664 } else { /* Must be ACPI_TYPE_STRING. */
665 nval = 1;
666 obj = of_compatible;
667 }
668 /* Now we can look for the driver DT compatible strings */
669 for (i = 0; i < nval; i++, obj++) {
670 const struct of_device_id *id;
671
672 for (id = of_match_table; id->compatible[0]; id++)
673 if (!strcasecmp(obj->string.pointer, id->compatible))
674 return true;
675 }
676
677 return false;
678}
679
680static bool __acpi_match_device_cls(const struct acpi_device_id *id,
681 struct acpi_hardware_id *hwid)
682{
683 int i, msk, byte_shift;
684 char buf[3];
685
686 if (!id->cls)
687 return false;
688
689 /* Apply class-code bitmask, before checking each class-code byte */
690 for (i = 1; i <= 3; i++) {
691 byte_shift = 8 * (3 - i);
692 msk = (id->cls_msk >> byte_shift) & 0xFF;
693 if (!msk)
694 continue;
695
696 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
697 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
698 return false;
699 }
700 return true;
701}
702
703static const struct acpi_device_id *__acpi_match_device(
704 struct acpi_device *device,
705 const struct acpi_device_id *ids,
706 const struct of_device_id *of_ids)
707{
708 const struct acpi_device_id *id;
709 struct acpi_hardware_id *hwid;
710
711 /*
712 * If the device is not present, it is unnecessary to load device
713 * driver for it.
714 */
715 if (!device || !device->status.present)
716 return NULL;
717
718 list_for_each_entry(hwid, &device->pnp.ids, list) {
719 /* First, check the ACPI/PNP IDs provided by the caller. */
720 for (id = ids; id->id[0] || id->cls; id++) {
721 if (id->id[0] && !strcmp((char *) id->id, hwid->id))
722 return id;
723 else if (id->cls && __acpi_match_device_cls(id, hwid))
724 return id;
725 }
726
727 /*
728 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
729 * "compatible" property if found.
730 *
731 * The id returned by the below is not valid, but the only
732 * caller passing non-NULL of_ids here is only interested in
733 * whether or not the return value is NULL.
734 */
735 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
736 && acpi_of_match_device(device, of_ids))
737 return id;
738 }
739 return NULL;
740}
741
742/**
743 * acpi_match_device - Match a struct device against a given list of ACPI IDs
744 * @ids: Array of struct acpi_device_id object to match against.
745 * @dev: The device structure to match.
746 *
747 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
748 * object for that handle and use that object to match against a given list of
749 * device IDs.
750 *
751 * Return a pointer to the first matching ID on success or %NULL on failure.
752 */
753const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
754 const struct device *dev)
755{
756 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
757}
758EXPORT_SYMBOL_GPL(acpi_match_device);
759
760int acpi_match_device_ids(struct acpi_device *device,
761 const struct acpi_device_id *ids)
762{
763 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
764}
765EXPORT_SYMBOL(acpi_match_device_ids);
766
767bool acpi_driver_match_device(struct device *dev,
768 const struct device_driver *drv)
769{
770 if (!drv->acpi_match_table)
771 return acpi_of_match_device(ACPI_COMPANION(dev),
772 drv->of_match_table);
773
774 return !!__acpi_match_device(acpi_companion_match(dev),
775 drv->acpi_match_table, drv->of_match_table);
776}
777EXPORT_SYMBOL_GPL(acpi_driver_match_device);
778
779/* --------------------------------------------------------------------------
780 ACPI Driver Management
781 -------------------------------------------------------------------------- */
782
783/**
784 * acpi_bus_register_driver - register a driver with the ACPI bus
785 * @driver: driver being registered
786 *
787 * Registers a driver with the ACPI bus. Searches the namespace for all
788 * devices that match the driver's criteria and binds. Returns zero for
789 * success or a negative error status for failure.
790 */
791int acpi_bus_register_driver(struct acpi_driver *driver)
792{
793 int ret;
794
795 if (acpi_disabled)
796 return -ENODEV;
797 driver->drv.name = driver->name;
798 driver->drv.bus = &acpi_bus_type;
799 driver->drv.owner = driver->owner;
800
801 ret = driver_register(&driver->drv);
802 return ret;
803}
804
805EXPORT_SYMBOL(acpi_bus_register_driver);
806
807/**
808 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
809 * @driver: driver to unregister
810 *
811 * Unregisters a driver with the ACPI bus. Searches the namespace for all
812 * devices that match the driver's criteria and unbinds.
813 */
814void acpi_bus_unregister_driver(struct acpi_driver *driver)
815{
816 driver_unregister(&driver->drv);
817}
818
819EXPORT_SYMBOL(acpi_bus_unregister_driver);
820
821/* --------------------------------------------------------------------------
822 ACPI Bus operations
823 -------------------------------------------------------------------------- */
824
825static int acpi_bus_match(struct device *dev, struct device_driver *drv)
826{
827 struct acpi_device *acpi_dev = to_acpi_device(dev);
828 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
829
830 return acpi_dev->flags.match_driver
831 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
832}
833
834static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
835{
836 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
837}
838
839static int acpi_device_probe(struct device *dev)
840{
841 struct acpi_device *acpi_dev = to_acpi_device(dev);
842 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
843 int ret;
844
845 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
846 return -EINVAL;
847
848 if (!acpi_drv->ops.add)
849 return -ENOSYS;
850
851 ret = acpi_drv->ops.add(acpi_dev);
852 if (ret)
853 return ret;
854
855 acpi_dev->driver = acpi_drv;
856 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
857 "Driver [%s] successfully bound to device [%s]\n",
858 acpi_drv->name, acpi_dev->pnp.bus_id));
859
860 if (acpi_drv->ops.notify) {
861 ret = acpi_device_install_notify_handler(acpi_dev);
862 if (ret) {
863 if (acpi_drv->ops.remove)
864 acpi_drv->ops.remove(acpi_dev);
865
866 acpi_dev->driver = NULL;
867 acpi_dev->driver_data = NULL;
868 return ret;
869 }
870 }
871
872 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
873 acpi_drv->name, acpi_dev->pnp.bus_id));
874 get_device(dev);
875 return 0;
876}
877
878static int acpi_device_remove(struct device * dev)
879{
880 struct acpi_device *acpi_dev = to_acpi_device(dev);
881 struct acpi_driver *acpi_drv = acpi_dev->driver;
882
883 if (acpi_drv) {
884 if (acpi_drv->ops.notify)
885 acpi_device_remove_notify_handler(acpi_dev);
886 if (acpi_drv->ops.remove)
887 acpi_drv->ops.remove(acpi_dev);
888 }
889 acpi_dev->driver = NULL;
890 acpi_dev->driver_data = NULL;
891
892 put_device(dev);
893 return 0;
894}
895
896struct bus_type acpi_bus_type = {
897 .name = "acpi",
898 .match = acpi_bus_match,
899 .probe = acpi_device_probe,
900 .remove = acpi_device_remove,
901 .uevent = acpi_device_uevent,
902};
903
904/* --------------------------------------------------------------------------
905 Initialization/Cleanup
906 -------------------------------------------------------------------------- */
907
908static int __init acpi_bus_init_irq(void)
909{
910 acpi_status status;
911 char *message = NULL;
912
913
914 /*
915 * Let the system know what interrupt model we are using by
916 * evaluating the \_PIC object, if exists.
917 */
918
919 switch (acpi_irq_model) {
920 case ACPI_IRQ_MODEL_PIC:
921 message = "PIC";
922 break;
923 case ACPI_IRQ_MODEL_IOAPIC:
924 message = "IOAPIC";
925 break;
926 case ACPI_IRQ_MODEL_IOSAPIC:
927 message = "IOSAPIC";
928 break;
929 case ACPI_IRQ_MODEL_GIC:
930 message = "GIC";
931 break;
932 case ACPI_IRQ_MODEL_PLATFORM:
933 message = "platform specific model";
934 break;
935 default:
936 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
937 return -ENODEV;
938 }
939
940 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
941
942 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
943 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
944 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
945 return -ENODEV;
946 }
947
948 return 0;
949}
950
951/**
952 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
953 *
954 * The ACPI tables are accessible after this, but the handling of events has not
955 * been initialized and the global lock is not available yet, so AML should not
956 * be executed at this point.
957 *
958 * Doing this before switching the EFI runtime services to virtual mode allows
959 * the EfiBootServices memory to be freed slightly earlier on boot.
960 */
961void __init acpi_early_init(void)
962{
963 acpi_status status;
964
965 if (acpi_disabled)
966 return;
967
968 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
969
970 /* It's safe to verify table checksums during late stage */
971 acpi_gbl_verify_table_checksum = TRUE;
972
973 /* enable workarounds, unless strict ACPI spec. compliance */
974 if (!acpi_strict)
975 acpi_gbl_enable_interpreter_slack = TRUE;
976
977 acpi_permanent_mmap = true;
978
979 /*
980 * If the machine falls into the DMI check table,
981 * DSDT will be copied to memory
982 */
983 dmi_check_system(dsdt_dmi_table);
984
985 status = acpi_reallocate_root_table();
986 if (ACPI_FAILURE(status)) {
987 printk(KERN_ERR PREFIX
988 "Unable to reallocate ACPI tables\n");
989 goto error0;
990 }
991
992 status = acpi_initialize_subsystem();
993 if (ACPI_FAILURE(status)) {
994 printk(KERN_ERR PREFIX
995 "Unable to initialize the ACPI Interpreter\n");
996 goto error0;
997 }
998
999 if (!acpi_gbl_parse_table_as_term_list &&
1000 acpi_gbl_group_module_level_code) {
1001 status = acpi_load_tables();
1002 if (ACPI_FAILURE(status)) {
1003 printk(KERN_ERR PREFIX
1004 "Unable to load the System Description Tables\n");
1005 goto error0;
1006 }
1007 }
1008
1009#ifdef CONFIG_X86
1010 if (!acpi_ioapic) {
1011 /* compatible (0) means level (3) */
1012 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1013 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1014 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1015 }
1016 /* Set PIC-mode SCI trigger type */
1017 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1018 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1019 } else {
1020 /*
1021 * now that acpi_gbl_FADT is initialized,
1022 * update it with result from INT_SRC_OVR parsing
1023 */
1024 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1025 }
1026#endif
1027 return;
1028
1029 error0:
1030 disable_acpi();
1031}
1032
1033/**
1034 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1035 *
1036 * Switch over the platform to the ACPI mode (if possible).
1037 *
1038 * Doing this too early is generally unsafe, but at the same time it needs to be
1039 * done before all things that really depend on ACPI. The right spot appears to
1040 * be before finalizing the EFI initialization.
1041 */
1042void __init acpi_subsystem_init(void)
1043{
1044 acpi_status status;
1045
1046 if (acpi_disabled)
1047 return;
1048
1049 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1050 if (ACPI_FAILURE(status)) {
1051 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1052 disable_acpi();
1053 } else {
1054 /*
1055 * If the system is using ACPI then we can be reasonably
1056 * confident that any regulators are managed by the firmware
1057 * so tell the regulator core it has everything it needs to
1058 * know.
1059 */
1060 regulator_has_full_constraints();
1061 }
1062}
1063
1064static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1065{
1066 acpi_scan_table_handler(event, table, context);
1067
1068 return acpi_sysfs_table_handler(event, table, context);
1069}
1070
1071static int __init acpi_bus_init(void)
1072{
1073 int result;
1074 acpi_status status;
1075
1076 acpi_os_initialize1();
1077
1078 /*
1079 * ACPI 2.0 requires the EC driver to be loaded and work before
1080 * the EC device is found in the namespace (i.e. before
1081 * acpi_load_tables() is called).
1082 *
1083 * This is accomplished by looking for the ECDT table, and getting
1084 * the EC parameters out of that.
1085 */
1086 status = acpi_ec_ecdt_probe();
1087 /* Ignore result. Not having an ECDT is not fatal. */
1088
1089 if (acpi_gbl_parse_table_as_term_list ||
1090 !acpi_gbl_group_module_level_code) {
1091 status = acpi_load_tables();
1092 if (ACPI_FAILURE(status)) {
1093 printk(KERN_ERR PREFIX
1094 "Unable to load the System Description Tables\n");
1095 goto error1;
1096 }
1097 }
1098
1099 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1100 if (ACPI_FAILURE(status)) {
1101 printk(KERN_ERR PREFIX
1102 "Unable to start the ACPI Interpreter\n");
1103 goto error1;
1104 }
1105
1106 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1107 if (ACPI_FAILURE(status)) {
1108 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1109 goto error1;
1110 }
1111
1112 /* Set capability bits for _OSC under processor scope */
1113 acpi_early_processor_osc();
1114
1115 /*
1116 * _OSC method may exist in module level code,
1117 * so it must be run after ACPI_FULL_INITIALIZATION
1118 */
1119 acpi_bus_osc_support();
1120
1121 /*
1122 * _PDC control method may load dynamic SSDT tables,
1123 * and we need to install the table handler before that.
1124 */
1125 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1126
1127 acpi_sysfs_init();
1128
1129 acpi_early_processor_set_pdc();
1130
1131 /*
1132 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1133 * is necessary to enable it as early as possible.
1134 */
1135 acpi_ec_dsdt_probe();
1136
1137 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1138
1139 /* Initialize sleep structures */
1140 acpi_sleep_init();
1141
1142 /*
1143 * Get the system interrupt model and evaluate \_PIC.
1144 */
1145 result = acpi_bus_init_irq();
1146 if (result)
1147 goto error1;
1148
1149 /*
1150 * Register the for all standard device notifications.
1151 */
1152 status =
1153 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1154 &acpi_bus_notify, NULL);
1155 if (ACPI_FAILURE(status)) {
1156 printk(KERN_ERR PREFIX
1157 "Unable to register for device notifications\n");
1158 goto error1;
1159 }
1160
1161 /*
1162 * Create the top ACPI proc directory
1163 */
1164 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1165
1166 result = bus_register(&acpi_bus_type);
1167 if (!result)
1168 return 0;
1169
1170 /* Mimic structured exception handling */
1171 error1:
1172 acpi_terminate();
1173 return -ENODEV;
1174}
1175
1176struct kobject *acpi_kobj;
1177EXPORT_SYMBOL_GPL(acpi_kobj);
1178
1179static int __init acpi_init(void)
1180{
1181 int result;
1182
1183 if (acpi_disabled) {
1184 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1185 return -ENODEV;
1186 }
1187
1188 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1189 if (!acpi_kobj) {
1190 printk(KERN_WARNING "%s: kset create error\n", __func__);
1191 acpi_kobj = NULL;
1192 }
1193
1194 init_acpi_device_notify();
1195 result = acpi_bus_init();
1196 if (result) {
1197 disable_acpi();
1198 return result;
1199 }
1200
1201 pci_mmcfg_late_init();
1202 acpi_iort_init();
1203 acpi_scan_init();
1204 acpi_ec_init();
1205 acpi_debugfs_init();
1206 acpi_sleep_proc_init();
1207 acpi_wakeup_device_init();
1208 acpi_debugger_init();
1209 acpi_setup_sb_notify_handler();
1210 acpi_set_processor_mapping();
1211 return 0;
1212}
1213
1214subsys_initcall(acpi_init);