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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 const char *state_string(int state)
186{
187 switch (state) {
188 case ACPI_STATE_D0:
189 return "D0";
190 case ACPI_STATE_D1:
191 return "D1";
192 case ACPI_STATE_D2:
193 return "D2";
194 case ACPI_STATE_D3_HOT:
195 return "D3hot";
196 case ACPI_STATE_D3_COLD:
197 return "D3";
198 default:
199 return "(unknown)";
200 }
201}
202
203static int __acpi_bus_get_power(struct acpi_device *device, int *state)
204{
205 int result = ACPI_STATE_UNKNOWN;
206
207 if (!device || !state)
208 return -EINVAL;
209
210 if (!device->flags.power_manageable) {
211 /* TBD: Non-recursive algorithm for walking up hierarchy. */
212 *state = device->parent ?
213 device->parent->power.state : ACPI_STATE_D0;
214 goto out;
215 }
216
217 /*
218 * Get the device's power state either directly (via _PSC) or
219 * indirectly (via power resources).
220 */
221 if (device->power.flags.explicit_get) {
222 unsigned long long psc;
223 acpi_status status = acpi_evaluate_integer(device->handle,
224 "_PSC", NULL, &psc);
225 if (ACPI_FAILURE(status))
226 return -ENODEV;
227
228 result = psc;
229 }
230 /* The test below covers ACPI_STATE_UNKNOWN too. */
231 if (result <= ACPI_STATE_D2) {
232 ; /* Do nothing. */
233 } else if (device->power.flags.power_resources) {
234 int error = acpi_power_get_inferred_state(device, &result);
235 if (error)
236 return error;
237 } else if (result == ACPI_STATE_D3_HOT) {
238 result = ACPI_STATE_D3;
239 }
240
241 /*
242 * If we were unsure about the device parent's power state up to this
243 * point, the fact that the device is in D0 implies that the parent has
244 * to be in D0 too.
245 */
246 if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
247 && result == ACPI_STATE_D0)
248 device->parent->power.state = ACPI_STATE_D0;
249
250 *state = result;
251
252 out:
253 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
254 device->pnp.bus_id, state_string(*state)));
255
256 return 0;
257}
258
259
260static int __acpi_bus_set_power(struct acpi_device *device, int state)
261{
262 int result = 0;
263 acpi_status status = AE_OK;
264 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
265
266 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
267 return -EINVAL;
268
269 /* Make sure this is a valid target state */
270
271 if (state == device->power.state) {
272 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
273 state_string(state)));
274 return 0;
275 }
276
277 if (!device->power.states[state].flags.valid) {
278 printk(KERN_WARNING PREFIX "Device does not support %s\n",
279 state_string(state));
280 return -ENODEV;
281 }
282 if (device->parent && (state < device->parent->power.state)) {
283 printk(KERN_WARNING PREFIX
284 "Cannot set device to a higher-powered"
285 " state than parent\n");
286 return -ENODEV;
287 }
288
289 /* For D3cold we should execute _PS3, not _PS4. */
290 if (state == ACPI_STATE_D3_COLD)
291 object_name[3] = '3';
292
293 /*
294 * Transition Power
295 * ----------------
296 * On transitions to a high-powered state we first apply power (via
297 * power resources) then evalute _PSx. Conversly for transitions to
298 * a lower-powered state.
299 */
300 if (state < device->power.state) {
301 if (device->power.flags.power_resources) {
302 result = acpi_power_transition(device, state);
303 if (result)
304 goto end;
305 }
306 if (device->power.states[state].flags.explicit_set) {
307 status = acpi_evaluate_object(device->handle,
308 object_name, NULL, NULL);
309 if (ACPI_FAILURE(status)) {
310 result = -ENODEV;
311 goto end;
312 }
313 }
314 } else {
315 if (device->power.states[state].flags.explicit_set) {
316 status = acpi_evaluate_object(device->handle,
317 object_name, NULL, NULL);
318 if (ACPI_FAILURE(status)) {
319 result = -ENODEV;
320 goto end;
321 }
322 }
323 if (device->power.flags.power_resources) {
324 result = acpi_power_transition(device, state);
325 if (result)
326 goto end;
327 }
328 }
329
330 end:
331 if (result)
332 printk(KERN_WARNING PREFIX
333 "Device [%s] failed to transition to %s\n",
334 device->pnp.bus_id, state_string(state));
335 else {
336 device->power.state = state;
337 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
338 "Device [%s] transitioned to %s\n",
339 device->pnp.bus_id, state_string(state)));
340 }
341
342 return result;
343}
344
345
346int acpi_bus_set_power(acpi_handle handle, int state)
347{
348 struct acpi_device *device;
349 int result;
350
351 result = acpi_bus_get_device(handle, &device);
352 if (result)
353 return result;
354
355 if (!device->flags.power_manageable) {
356 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
357 "Device [%s] is not power manageable\n",
358 dev_name(&device->dev)));
359 return -ENODEV;
360 }
361
362 return __acpi_bus_set_power(device, state);
363}
364EXPORT_SYMBOL(acpi_bus_set_power);
365
366
367int acpi_bus_init_power(struct acpi_device *device)
368{
369 int state;
370 int result;
371
372 if (!device)
373 return -EINVAL;
374
375 device->power.state = ACPI_STATE_UNKNOWN;
376
377 result = __acpi_bus_get_power(device, &state);
378 if (result)
379 return result;
380
381 if (device->power.flags.power_resources)
382 result = acpi_power_on_resources(device, state);
383
384 if (!result)
385 device->power.state = state;
386
387 return result;
388}
389
390
391int acpi_bus_update_power(acpi_handle handle, int *state_p)
392{
393 struct acpi_device *device;
394 int state;
395 int result;
396
397 result = acpi_bus_get_device(handle, &device);
398 if (result)
399 return result;
400
401 result = __acpi_bus_get_power(device, &state);
402 if (result)
403 return result;
404
405 result = __acpi_bus_set_power(device, state);
406 if (!result && state_p)
407 *state_p = state;
408
409 return result;
410}
411EXPORT_SYMBOL_GPL(acpi_bus_update_power);
412
413
414bool acpi_bus_power_manageable(acpi_handle handle)
415{
416 struct acpi_device *device;
417 int result;
418
419 result = acpi_bus_get_device(handle, &device);
420 return result ? false : device->flags.power_manageable;
421}
422
423EXPORT_SYMBOL(acpi_bus_power_manageable);
424
425bool acpi_bus_can_wakeup(acpi_handle handle)
426{
427 struct acpi_device *device;
428 int result;
429
430 result = acpi_bus_get_device(handle, &device);
431 return result ? false : device->wakeup.flags.valid;
432}
433
434EXPORT_SYMBOL(acpi_bus_can_wakeup);
435
436static void acpi_print_osc_error(acpi_handle handle,
437 struct acpi_osc_context *context, char *error)
438{
439 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
440 int i;
441
442 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
443 printk(KERN_DEBUG "%s\n", error);
444 else {
445 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
446 kfree(buffer.pointer);
447 }
448 printk(KERN_DEBUG"_OSC request data:");
449 for (i = 0; i < context->cap.length; i += sizeof(u32))
450 printk("%x ", *((u32 *)(context->cap.pointer + i)));
451 printk("\n");
452}
453
454static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
455{
456 int i;
457 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
458 24, 26, 28, 30, 32, 34};
459
460 if (strlen(str) != 36)
461 return AE_BAD_PARAMETER;
462 for (i = 0; i < 36; i++) {
463 if (i == 8 || i == 13 || i == 18 || i == 23) {
464 if (str[i] != '-')
465 return AE_BAD_PARAMETER;
466 } else if (!isxdigit(str[i]))
467 return AE_BAD_PARAMETER;
468 }
469 for (i = 0; i < 16; i++) {
470 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
471 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
472 }
473 return AE_OK;
474}
475
476acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
477{
478 acpi_status status;
479 struct acpi_object_list input;
480 union acpi_object in_params[4];
481 union acpi_object *out_obj;
482 u8 uuid[16];
483 u32 errors;
484 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
485
486 if (!context)
487 return AE_ERROR;
488 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
489 return AE_ERROR;
490 context->ret.length = ACPI_ALLOCATE_BUFFER;
491 context->ret.pointer = NULL;
492
493 /* Setting up input parameters */
494 input.count = 4;
495 input.pointer = in_params;
496 in_params[0].type = ACPI_TYPE_BUFFER;
497 in_params[0].buffer.length = 16;
498 in_params[0].buffer.pointer = uuid;
499 in_params[1].type = ACPI_TYPE_INTEGER;
500 in_params[1].integer.value = context->rev;
501 in_params[2].type = ACPI_TYPE_INTEGER;
502 in_params[2].integer.value = context->cap.length/sizeof(u32);
503 in_params[3].type = ACPI_TYPE_BUFFER;
504 in_params[3].buffer.length = context->cap.length;
505 in_params[3].buffer.pointer = context->cap.pointer;
506
507 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
508 if (ACPI_FAILURE(status))
509 return status;
510
511 if (!output.length)
512 return AE_NULL_OBJECT;
513
514 out_obj = output.pointer;
515 if (out_obj->type != ACPI_TYPE_BUFFER
516 || out_obj->buffer.length != context->cap.length) {
517 acpi_print_osc_error(handle, context,
518 "_OSC evaluation returned wrong type");
519 status = AE_TYPE;
520 goto out_kfree;
521 }
522 /* Need to ignore the bit0 in result code */
523 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
524 if (errors) {
525 if (errors & OSC_REQUEST_ERROR)
526 acpi_print_osc_error(handle, context,
527 "_OSC request failed");
528 if (errors & OSC_INVALID_UUID_ERROR)
529 acpi_print_osc_error(handle, context,
530 "_OSC invalid UUID");
531 if (errors & OSC_INVALID_REVISION_ERROR)
532 acpi_print_osc_error(handle, context,
533 "_OSC invalid revision");
534 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
535 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
536 & OSC_QUERY_ENABLE)
537 goto out_success;
538 status = AE_SUPPORT;
539 goto out_kfree;
540 }
541 status = AE_ERROR;
542 goto out_kfree;
543 }
544out_success:
545 context->ret.length = out_obj->buffer.length;
546 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
547 if (!context->ret.pointer) {
548 status = AE_NO_MEMORY;
549 goto out_kfree;
550 }
551 memcpy(context->ret.pointer, out_obj->buffer.pointer,
552 context->ret.length);
553 status = AE_OK;
554
555out_kfree:
556 kfree(output.pointer);
557 if (status != AE_OK)
558 context->ret.pointer = NULL;
559 return status;
560}
561EXPORT_SYMBOL(acpi_run_osc);
562
563bool osc_sb_apei_support_acked;
564static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
565static void acpi_bus_osc_support(void)
566{
567 u32 capbuf[2];
568 struct acpi_osc_context context = {
569 .uuid_str = sb_uuid_str,
570 .rev = 1,
571 .cap.length = 8,
572 .cap.pointer = capbuf,
573 };
574 acpi_handle handle;
575
576 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
577 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
578#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
579 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
580 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
581#endif
582
583#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
584 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
585#endif
586
587 if (!ghes_disable)
588 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
589 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
590 return;
591 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
592 u32 *capbuf_ret = context.ret.pointer;
593 if (context.ret.length > OSC_SUPPORT_TYPE)
594 osc_sb_apei_support_acked =
595 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
596 kfree(context.ret.pointer);
597 }
598 /* do we need to check other returned cap? Sounds no */
599}
600
601/* --------------------------------------------------------------------------
602 Event Management
603 -------------------------------------------------------------------------- */
604
605#ifdef CONFIG_ACPI_PROC_EVENT
606static DEFINE_SPINLOCK(acpi_bus_event_lock);
607
608LIST_HEAD(acpi_bus_event_list);
609DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
610
611extern int event_is_open;
612
613int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
614{
615 struct acpi_bus_event *event;
616 unsigned long flags = 0;
617
618 /* drop event on the floor if no one's listening */
619 if (!event_is_open)
620 return 0;
621
622 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
623 if (!event)
624 return -ENOMEM;
625
626 strcpy(event->device_class, device_class);
627 strcpy(event->bus_id, bus_id);
628 event->type = type;
629 event->data = data;
630
631 spin_lock_irqsave(&acpi_bus_event_lock, flags);
632 list_add_tail(&event->node, &acpi_bus_event_list);
633 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
634
635 wake_up_interruptible(&acpi_bus_event_queue);
636
637 return 0;
638
639}
640
641EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
642
643int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
644{
645 if (!device)
646 return -EINVAL;
647 return acpi_bus_generate_proc_event4(device->pnp.device_class,
648 device->pnp.bus_id, type, data);
649}
650
651EXPORT_SYMBOL(acpi_bus_generate_proc_event);
652
653int acpi_bus_receive_event(struct acpi_bus_event *event)
654{
655 unsigned long flags = 0;
656 struct acpi_bus_event *entry = NULL;
657
658 DECLARE_WAITQUEUE(wait, current);
659
660
661 if (!event)
662 return -EINVAL;
663
664 if (list_empty(&acpi_bus_event_list)) {
665
666 set_current_state(TASK_INTERRUPTIBLE);
667 add_wait_queue(&acpi_bus_event_queue, &wait);
668
669 if (list_empty(&acpi_bus_event_list))
670 schedule();
671
672 remove_wait_queue(&acpi_bus_event_queue, &wait);
673 set_current_state(TASK_RUNNING);
674
675 if (signal_pending(current))
676 return -ERESTARTSYS;
677 }
678
679 spin_lock_irqsave(&acpi_bus_event_lock, flags);
680 if (!list_empty(&acpi_bus_event_list)) {
681 entry = list_entry(acpi_bus_event_list.next,
682 struct acpi_bus_event, node);
683 list_del(&entry->node);
684 }
685 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
686
687 if (!entry)
688 return -ENODEV;
689
690 memcpy(event, entry, sizeof(struct acpi_bus_event));
691
692 kfree(entry);
693
694 return 0;
695}
696
697#endif /* CONFIG_ACPI_PROC_EVENT */
698
699/* --------------------------------------------------------------------------
700 Notification Handling
701 -------------------------------------------------------------------------- */
702
703static void acpi_bus_check_device(acpi_handle handle)
704{
705 struct acpi_device *device;
706 acpi_status status;
707 struct acpi_device_status old_status;
708
709 if (acpi_bus_get_device(handle, &device))
710 return;
711 if (!device)
712 return;
713
714 old_status = device->status;
715
716 /*
717 * Make sure this device's parent is present before we go about
718 * messing with the device.
719 */
720 if (device->parent && !device->parent->status.present) {
721 device->status = device->parent->status;
722 return;
723 }
724
725 status = acpi_bus_get_status(device);
726 if (ACPI_FAILURE(status))
727 return;
728
729 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
730 return;
731
732 /*
733 * Device Insertion/Removal
734 */
735 if ((device->status.present) && !(old_status.present)) {
736 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
737 /* TBD: Handle device insertion */
738 } else if (!(device->status.present) && (old_status.present)) {
739 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
740 /* TBD: Handle device removal */
741 }
742}
743
744static void acpi_bus_check_scope(acpi_handle handle)
745{
746 /* Status Change? */
747 acpi_bus_check_device(handle);
748
749 /*
750 * TBD: Enumerate child devices within this device's scope and
751 * run acpi_bus_check_device()'s on them.
752 */
753}
754
755static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
756int register_acpi_bus_notifier(struct notifier_block *nb)
757{
758 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
759}
760EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
761
762void unregister_acpi_bus_notifier(struct notifier_block *nb)
763{
764 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
765}
766EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
767
768/**
769 * acpi_bus_notify
770 * ---------------
771 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
772 */
773static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
774{
775 struct acpi_device *device = NULL;
776 struct acpi_driver *driver;
777
778 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
779 type, handle));
780
781 blocking_notifier_call_chain(&acpi_bus_notify_list,
782 type, (void *)handle);
783
784 switch (type) {
785
786 case ACPI_NOTIFY_BUS_CHECK:
787 acpi_bus_check_scope(handle);
788 /*
789 * TBD: We'll need to outsource certain events to non-ACPI
790 * drivers via the device manager (device.c).
791 */
792 break;
793
794 case ACPI_NOTIFY_DEVICE_CHECK:
795 acpi_bus_check_device(handle);
796 /*
797 * TBD: We'll need to outsource certain events to non-ACPI
798 * drivers via the device manager (device.c).
799 */
800 break;
801
802 case ACPI_NOTIFY_DEVICE_WAKE:
803 /* TBD */
804 break;
805
806 case ACPI_NOTIFY_EJECT_REQUEST:
807 /* TBD */
808 break;
809
810 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
811 /* TBD: Exactly what does 'light' mean? */
812 break;
813
814 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
815 /* TBD */
816 break;
817
818 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
819 /* TBD */
820 break;
821
822 case ACPI_NOTIFY_POWER_FAULT:
823 /* TBD */
824 break;
825
826 default:
827 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
828 "Received unknown/unsupported notification [%08x]\n",
829 type));
830 break;
831 }
832
833 acpi_bus_get_device(handle, &device);
834 if (device) {
835 driver = device->driver;
836 if (driver && driver->ops.notify &&
837 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
838 driver->ops.notify(device, type);
839 }
840}
841
842/* --------------------------------------------------------------------------
843 Initialization/Cleanup
844 -------------------------------------------------------------------------- */
845
846static int __init acpi_bus_init_irq(void)
847{
848 acpi_status status = AE_OK;
849 union acpi_object arg = { ACPI_TYPE_INTEGER };
850 struct acpi_object_list arg_list = { 1, &arg };
851 char *message = NULL;
852
853
854 /*
855 * Let the system know what interrupt model we are using by
856 * evaluating the \_PIC object, if exists.
857 */
858
859 switch (acpi_irq_model) {
860 case ACPI_IRQ_MODEL_PIC:
861 message = "PIC";
862 break;
863 case ACPI_IRQ_MODEL_IOAPIC:
864 message = "IOAPIC";
865 break;
866 case ACPI_IRQ_MODEL_IOSAPIC:
867 message = "IOSAPIC";
868 break;
869 case ACPI_IRQ_MODEL_PLATFORM:
870 message = "platform specific model";
871 break;
872 default:
873 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
874 return -ENODEV;
875 }
876
877 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
878
879 arg.integer.value = acpi_irq_model;
880
881 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
882 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
883 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
884 return -ENODEV;
885 }
886
887 return 0;
888}
889
890u8 acpi_gbl_permanent_mmap;
891
892
893void __init acpi_early_init(void)
894{
895 acpi_status status = AE_OK;
896
897 if (acpi_disabled)
898 return;
899
900 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
901
902 /* enable workarounds, unless strict ACPI spec. compliance */
903 if (!acpi_strict)
904 acpi_gbl_enable_interpreter_slack = TRUE;
905
906 acpi_gbl_permanent_mmap = 1;
907
908 /*
909 * If the machine falls into the DMI check table,
910 * DSDT will be copied to memory
911 */
912 dmi_check_system(dsdt_dmi_table);
913
914 status = acpi_reallocate_root_table();
915 if (ACPI_FAILURE(status)) {
916 printk(KERN_ERR PREFIX
917 "Unable to reallocate ACPI tables\n");
918 goto error0;
919 }
920
921 status = acpi_initialize_subsystem();
922 if (ACPI_FAILURE(status)) {
923 printk(KERN_ERR PREFIX
924 "Unable to initialize the ACPI Interpreter\n");
925 goto error0;
926 }
927
928 status = acpi_load_tables();
929 if (ACPI_FAILURE(status)) {
930 printk(KERN_ERR PREFIX
931 "Unable to load the System Description Tables\n");
932 goto error0;
933 }
934
935#ifdef CONFIG_X86
936 if (!acpi_ioapic) {
937 /* compatible (0) means level (3) */
938 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
939 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
940 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
941 }
942 /* Set PIC-mode SCI trigger type */
943 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
944 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
945 } else {
946 /*
947 * now that acpi_gbl_FADT is initialized,
948 * update it with result from INT_SRC_OVR parsing
949 */
950 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
951 }
952#endif
953
954 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
955 if (ACPI_FAILURE(status)) {
956 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
957 goto error0;
958 }
959
960 return;
961
962 error0:
963 disable_acpi();
964 return;
965}
966
967static int __init acpi_bus_init(void)
968{
969 int result = 0;
970 acpi_status status = AE_OK;
971 extern acpi_status acpi_os_initialize1(void);
972
973 acpi_os_initialize1();
974
975 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
976 if (ACPI_FAILURE(status)) {
977 printk(KERN_ERR PREFIX
978 "Unable to start the ACPI Interpreter\n");
979 goto error1;
980 }
981
982 /*
983 * ACPI 2.0 requires the EC driver to be loaded and work before
984 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
985 * is called).
986 *
987 * This is accomplished by looking for the ECDT table, and getting
988 * the EC parameters out of that.
989 */
990 status = acpi_ec_ecdt_probe();
991 /* Ignore result. Not having an ECDT is not fatal. */
992
993 acpi_bus_osc_support();
994
995 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
996 if (ACPI_FAILURE(status)) {
997 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
998 goto error1;
999 }
1000
1001 /*
1002 * _PDC control method may load dynamic SSDT tables,
1003 * and we need to install the table handler before that.
1004 */
1005 acpi_sysfs_init();
1006
1007 acpi_early_processor_set_pdc();
1008
1009 /*
1010 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1011 * is necessary to enable it as early as possible.
1012 */
1013 acpi_boot_ec_enable();
1014
1015 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1016
1017 /* Initialize sleep structures */
1018 acpi_sleep_init();
1019
1020 /*
1021 * Get the system interrupt model and evaluate \_PIC.
1022 */
1023 result = acpi_bus_init_irq();
1024 if (result)
1025 goto error1;
1026
1027 /*
1028 * Register the for all standard device notifications.
1029 */
1030 status =
1031 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1032 &acpi_bus_notify, NULL);
1033 if (ACPI_FAILURE(status)) {
1034 printk(KERN_ERR PREFIX
1035 "Unable to register for device notifications\n");
1036 goto error1;
1037 }
1038
1039 /*
1040 * Create the top ACPI proc directory
1041 */
1042 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1043
1044 return 0;
1045
1046 /* Mimic structured exception handling */
1047 error1:
1048 acpi_terminate();
1049 return -ENODEV;
1050}
1051
1052struct kobject *acpi_kobj;
1053EXPORT_SYMBOL_GPL(acpi_kobj);
1054
1055static int __init acpi_init(void)
1056{
1057 int result;
1058
1059 if (acpi_disabled) {
1060 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1061 return -ENODEV;
1062 }
1063
1064 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1065 if (!acpi_kobj) {
1066 printk(KERN_WARNING "%s: kset create error\n", __func__);
1067 acpi_kobj = NULL;
1068 }
1069
1070 init_acpi_device_notify();
1071 result = acpi_bus_init();
1072 if (result) {
1073 disable_acpi();
1074 return result;
1075 }
1076
1077 pci_mmcfg_late_init();
1078 acpi_scan_init();
1079 acpi_ec_init();
1080 acpi_debugfs_init();
1081 acpi_sleep_proc_init();
1082 acpi_wakeup_device_init();
1083 return 0;
1084}
1085
1086subsys_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#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;
305static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
306static void acpi_bus_osc_support(void)
307{
308 u32 capbuf[2];
309 struct acpi_osc_context context = {
310 .uuid_str = sb_uuid_str,
311 .rev = 1,
312 .cap.length = 8,
313 .cap.pointer = capbuf,
314 };
315 acpi_handle handle;
316
317 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
318 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
319 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
320 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
321 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
322 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
323
324 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
325
326 if (!ghes_disable)
327 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
328 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
329 return;
330 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
331 u32 *capbuf_ret = context.ret.pointer;
332 if (context.ret.length > OSC_SUPPORT_DWORD)
333 osc_sb_apei_support_acked =
334 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
335 kfree(context.ret.pointer);
336 }
337 /* do we need to check other returned cap? Sounds no */
338}
339
340/* --------------------------------------------------------------------------
341 Notification Handling
342 -------------------------------------------------------------------------- */
343
344/**
345 * acpi_bus_notify
346 * ---------------
347 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
348 */
349static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
350{
351 struct acpi_device *adev;
352 struct acpi_driver *driver;
353 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
354 bool hotplug_event = false;
355
356 switch (type) {
357 case ACPI_NOTIFY_BUS_CHECK:
358 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
359 hotplug_event = true;
360 break;
361
362 case ACPI_NOTIFY_DEVICE_CHECK:
363 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
364 hotplug_event = true;
365 break;
366
367 case ACPI_NOTIFY_DEVICE_WAKE:
368 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
369 break;
370
371 case ACPI_NOTIFY_EJECT_REQUEST:
372 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
373 hotplug_event = true;
374 break;
375
376 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
377 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
378 /* TBD: Exactly what does 'light' mean? */
379 break;
380
381 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
382 acpi_handle_err(handle, "Device cannot be configured due "
383 "to a frequency mismatch\n");
384 break;
385
386 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
387 acpi_handle_err(handle, "Device cannot be configured due "
388 "to a bus mode mismatch\n");
389 break;
390
391 case ACPI_NOTIFY_POWER_FAULT:
392 acpi_handle_err(handle, "Device has suffered a power fault\n");
393 break;
394
395 default:
396 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
397 break;
398 }
399
400 adev = acpi_bus_get_acpi_device(handle);
401 if (!adev)
402 goto err;
403
404 driver = adev->driver;
405 if (driver && driver->ops.notify &&
406 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
407 driver->ops.notify(adev, type);
408
409 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
410 return;
411
412 acpi_bus_put_acpi_device(adev);
413 return;
414
415 err:
416 acpi_evaluate_ost(handle, type, ost_code, NULL);
417}
418
419static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
420{
421 struct acpi_device *device = data;
422
423 device->driver->ops.notify(device, event);
424}
425
426static void acpi_device_notify_fixed(void *data)
427{
428 struct acpi_device *device = data;
429
430 /* Fixed hardware devices have no handles */
431 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
432}
433
434static u32 acpi_device_fixed_event(void *data)
435{
436 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
437 return ACPI_INTERRUPT_HANDLED;
438}
439
440static int acpi_device_install_notify_handler(struct acpi_device *device)
441{
442 acpi_status status;
443
444 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
445 status =
446 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
447 acpi_device_fixed_event,
448 device);
449 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
450 status =
451 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
452 acpi_device_fixed_event,
453 device);
454 else
455 status = acpi_install_notify_handler(device->handle,
456 ACPI_DEVICE_NOTIFY,
457 acpi_device_notify,
458 device);
459
460 if (ACPI_FAILURE(status))
461 return -EINVAL;
462 return 0;
463}
464
465static void acpi_device_remove_notify_handler(struct acpi_device *device)
466{
467 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
468 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
469 acpi_device_fixed_event);
470 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
471 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
472 acpi_device_fixed_event);
473 else
474 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
475 acpi_device_notify);
476}
477
478/* --------------------------------------------------------------------------
479 Device Matching
480 -------------------------------------------------------------------------- */
481
482/**
483 * acpi_get_first_physical_node - Get first physical node of an ACPI device
484 * @adev: ACPI device in question
485 *
486 * Return: First physical node of ACPI device @adev
487 */
488struct device *acpi_get_first_physical_node(struct acpi_device *adev)
489{
490 struct mutex *physical_node_lock = &adev->physical_node_lock;
491 struct device *phys_dev;
492
493 mutex_lock(physical_node_lock);
494 if (list_empty(&adev->physical_node_list)) {
495 phys_dev = NULL;
496 } else {
497 const struct acpi_device_physical_node *node;
498
499 node = list_first_entry(&adev->physical_node_list,
500 struct acpi_device_physical_node, node);
501
502 phys_dev = node->dev;
503 }
504 mutex_unlock(physical_node_lock);
505 return phys_dev;
506}
507
508static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
509 const struct device *dev)
510{
511 const struct device *phys_dev = acpi_get_first_physical_node(adev);
512
513 return phys_dev && phys_dev == dev ? adev : NULL;
514}
515
516/**
517 * acpi_device_is_first_physical_node - Is given dev first physical node
518 * @adev: ACPI companion device
519 * @dev: Physical device to check
520 *
521 * Function checks if given @dev is the first physical devices attached to
522 * the ACPI companion device. This distinction is needed in some cases
523 * where the same companion device is shared between many physical devices.
524 *
525 * Note that the caller have to provide valid @adev pointer.
526 */
527bool acpi_device_is_first_physical_node(struct acpi_device *adev,
528 const struct device *dev)
529{
530 return !!acpi_primary_dev_companion(adev, dev);
531}
532
533/*
534 * acpi_companion_match() - Can we match via ACPI companion device
535 * @dev: Device in question
536 *
537 * Check if the given device has an ACPI companion and if that companion has
538 * a valid list of PNP IDs, and if the device is the first (primary) physical
539 * device associated with it. Return the companion pointer if that's the case
540 * or NULL otherwise.
541 *
542 * If multiple physical devices are attached to a single ACPI companion, we need
543 * to be careful. The usage scenario for this kind of relationship is that all
544 * of the physical devices in question use resources provided by the ACPI
545 * companion. A typical case is an MFD device where all the sub-devices share
546 * the parent's ACPI companion. In such cases we can only allow the primary
547 * (first) physical device to be matched with the help of the companion's PNP
548 * IDs.
549 *
550 * Additional physical devices sharing the ACPI companion can still use
551 * resources available from it but they will be matched normally using functions
552 * provided by their bus types (and analogously for their modalias).
553 */
554struct acpi_device *acpi_companion_match(const struct device *dev)
555{
556 struct acpi_device *adev;
557
558 adev = ACPI_COMPANION(dev);
559 if (!adev)
560 return NULL;
561
562 if (list_empty(&adev->pnp.ids))
563 return NULL;
564
565 return acpi_primary_dev_companion(adev, dev);
566}
567
568/**
569 * acpi_of_match_device - Match device object using the "compatible" property.
570 * @adev: ACPI device object to match.
571 * @of_match_table: List of device IDs to match against.
572 *
573 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
574 * identifiers and a _DSD object with the "compatible" property, use that
575 * property to match against the given list of identifiers.
576 */
577static bool acpi_of_match_device(struct acpi_device *adev,
578 const struct of_device_id *of_match_table)
579{
580 const union acpi_object *of_compatible, *obj;
581 int i, nval;
582
583 if (!adev)
584 return false;
585
586 of_compatible = adev->data.of_compatible;
587 if (!of_match_table || !of_compatible)
588 return false;
589
590 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
591 nval = of_compatible->package.count;
592 obj = of_compatible->package.elements;
593 } else { /* Must be ACPI_TYPE_STRING. */
594 nval = 1;
595 obj = of_compatible;
596 }
597 /* Now we can look for the driver DT compatible strings */
598 for (i = 0; i < nval; i++, obj++) {
599 const struct of_device_id *id;
600
601 for (id = of_match_table; id->compatible[0]; id++)
602 if (!strcasecmp(obj->string.pointer, id->compatible))
603 return true;
604 }
605
606 return false;
607}
608
609static bool __acpi_match_device_cls(const struct acpi_device_id *id,
610 struct acpi_hardware_id *hwid)
611{
612 int i, msk, byte_shift;
613 char buf[3];
614
615 if (!id->cls)
616 return false;
617
618 /* Apply class-code bitmask, before checking each class-code byte */
619 for (i = 1; i <= 3; i++) {
620 byte_shift = 8 * (3 - i);
621 msk = (id->cls_msk >> byte_shift) & 0xFF;
622 if (!msk)
623 continue;
624
625 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
626 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
627 return false;
628 }
629 return true;
630}
631
632static const struct acpi_device_id *__acpi_match_device(
633 struct acpi_device *device,
634 const struct acpi_device_id *ids,
635 const struct of_device_id *of_ids)
636{
637 const struct acpi_device_id *id;
638 struct acpi_hardware_id *hwid;
639
640 /*
641 * If the device is not present, it is unnecessary to load device
642 * driver for it.
643 */
644 if (!device || !device->status.present)
645 return NULL;
646
647 list_for_each_entry(hwid, &device->pnp.ids, list) {
648 /* First, check the ACPI/PNP IDs provided by the caller. */
649 for (id = ids; id->id[0] || id->cls; id++) {
650 if (id->id[0] && !strcmp((char *) id->id, hwid->id))
651 return id;
652 else if (id->cls && __acpi_match_device_cls(id, hwid))
653 return id;
654 }
655
656 /*
657 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
658 * "compatible" property if found.
659 *
660 * The id returned by the below is not valid, but the only
661 * caller passing non-NULL of_ids here is only interested in
662 * whether or not the return value is NULL.
663 */
664 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
665 && acpi_of_match_device(device, of_ids))
666 return id;
667 }
668 return NULL;
669}
670
671/**
672 * acpi_match_device - Match a struct device against a given list of ACPI IDs
673 * @ids: Array of struct acpi_device_id object to match against.
674 * @dev: The device structure to match.
675 *
676 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
677 * object for that handle and use that object to match against a given list of
678 * device IDs.
679 *
680 * Return a pointer to the first matching ID on success or %NULL on failure.
681 */
682const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
683 const struct device *dev)
684{
685 return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
686}
687EXPORT_SYMBOL_GPL(acpi_match_device);
688
689int acpi_match_device_ids(struct acpi_device *device,
690 const struct acpi_device_id *ids)
691{
692 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
693}
694EXPORT_SYMBOL(acpi_match_device_ids);
695
696bool acpi_driver_match_device(struct device *dev,
697 const struct device_driver *drv)
698{
699 if (!drv->acpi_match_table)
700 return acpi_of_match_device(ACPI_COMPANION(dev),
701 drv->of_match_table);
702
703 return !!__acpi_match_device(acpi_companion_match(dev),
704 drv->acpi_match_table, drv->of_match_table);
705}
706EXPORT_SYMBOL_GPL(acpi_driver_match_device);
707
708/* --------------------------------------------------------------------------
709 ACPI Driver Management
710 -------------------------------------------------------------------------- */
711
712/**
713 * acpi_bus_register_driver - register a driver with the ACPI bus
714 * @driver: driver being registered
715 *
716 * Registers a driver with the ACPI bus. Searches the namespace for all
717 * devices that match the driver's criteria and binds. Returns zero for
718 * success or a negative error status for failure.
719 */
720int acpi_bus_register_driver(struct acpi_driver *driver)
721{
722 int ret;
723
724 if (acpi_disabled)
725 return -ENODEV;
726 driver->drv.name = driver->name;
727 driver->drv.bus = &acpi_bus_type;
728 driver->drv.owner = driver->owner;
729
730 ret = driver_register(&driver->drv);
731 return ret;
732}
733
734EXPORT_SYMBOL(acpi_bus_register_driver);
735
736/**
737 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
738 * @driver: driver to unregister
739 *
740 * Unregisters a driver with the ACPI bus. Searches the namespace for all
741 * devices that match the driver's criteria and unbinds.
742 */
743void acpi_bus_unregister_driver(struct acpi_driver *driver)
744{
745 driver_unregister(&driver->drv);
746}
747
748EXPORT_SYMBOL(acpi_bus_unregister_driver);
749
750/* --------------------------------------------------------------------------
751 ACPI Bus operations
752 -------------------------------------------------------------------------- */
753
754static int acpi_bus_match(struct device *dev, struct device_driver *drv)
755{
756 struct acpi_device *acpi_dev = to_acpi_device(dev);
757 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
758
759 return acpi_dev->flags.match_driver
760 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
761}
762
763static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
764{
765 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
766}
767
768static int acpi_device_probe(struct device *dev)
769{
770 struct acpi_device *acpi_dev = to_acpi_device(dev);
771 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
772 int ret;
773
774 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
775 return -EINVAL;
776
777 if (!acpi_drv->ops.add)
778 return -ENOSYS;
779
780 ret = acpi_drv->ops.add(acpi_dev);
781 if (ret)
782 return ret;
783
784 acpi_dev->driver = acpi_drv;
785 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
786 "Driver [%s] successfully bound to device [%s]\n",
787 acpi_drv->name, acpi_dev->pnp.bus_id));
788
789 if (acpi_drv->ops.notify) {
790 ret = acpi_device_install_notify_handler(acpi_dev);
791 if (ret) {
792 if (acpi_drv->ops.remove)
793 acpi_drv->ops.remove(acpi_dev);
794
795 acpi_dev->driver = NULL;
796 acpi_dev->driver_data = NULL;
797 return ret;
798 }
799 }
800
801 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
802 acpi_drv->name, acpi_dev->pnp.bus_id));
803 get_device(dev);
804 return 0;
805}
806
807static int acpi_device_remove(struct device * dev)
808{
809 struct acpi_device *acpi_dev = to_acpi_device(dev);
810 struct acpi_driver *acpi_drv = acpi_dev->driver;
811
812 if (acpi_drv) {
813 if (acpi_drv->ops.notify)
814 acpi_device_remove_notify_handler(acpi_dev);
815 if (acpi_drv->ops.remove)
816 acpi_drv->ops.remove(acpi_dev);
817 }
818 acpi_dev->driver = NULL;
819 acpi_dev->driver_data = NULL;
820
821 put_device(dev);
822 return 0;
823}
824
825struct bus_type acpi_bus_type = {
826 .name = "acpi",
827 .match = acpi_bus_match,
828 .probe = acpi_device_probe,
829 .remove = acpi_device_remove,
830 .uevent = acpi_device_uevent,
831};
832
833/* --------------------------------------------------------------------------
834 Initialization/Cleanup
835 -------------------------------------------------------------------------- */
836
837static int __init acpi_bus_init_irq(void)
838{
839 acpi_status status;
840 char *message = NULL;
841
842
843 /*
844 * Let the system know what interrupt model we are using by
845 * evaluating the \_PIC object, if exists.
846 */
847
848 switch (acpi_irq_model) {
849 case ACPI_IRQ_MODEL_PIC:
850 message = "PIC";
851 break;
852 case ACPI_IRQ_MODEL_IOAPIC:
853 message = "IOAPIC";
854 break;
855 case ACPI_IRQ_MODEL_IOSAPIC:
856 message = "IOSAPIC";
857 break;
858 case ACPI_IRQ_MODEL_GIC:
859 message = "GIC";
860 break;
861 case ACPI_IRQ_MODEL_PLATFORM:
862 message = "platform specific model";
863 break;
864 default:
865 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
866 return -ENODEV;
867 }
868
869 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
870
871 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
872 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
873 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
874 return -ENODEV;
875 }
876
877 return 0;
878}
879
880/**
881 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
882 *
883 * The ACPI tables are accessible after this, but the handling of events has not
884 * been initialized and the global lock is not available yet, so AML should not
885 * be executed at this point.
886 *
887 * Doing this before switching the EFI runtime services to virtual mode allows
888 * the EfiBootServices memory to be freed slightly earlier on boot.
889 */
890void __init acpi_early_init(void)
891{
892 acpi_status status;
893
894 if (acpi_disabled)
895 return;
896
897 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
898
899 /* It's safe to verify table checksums during late stage */
900 acpi_gbl_verify_table_checksum = TRUE;
901
902 /* enable workarounds, unless strict ACPI spec. compliance */
903 if (!acpi_strict)
904 acpi_gbl_enable_interpreter_slack = TRUE;
905
906 acpi_gbl_permanent_mmap = 1;
907
908 /*
909 * If the machine falls into the DMI check table,
910 * DSDT will be copied to memory
911 */
912 dmi_check_system(dsdt_dmi_table);
913
914 status = acpi_reallocate_root_table();
915 if (ACPI_FAILURE(status)) {
916 printk(KERN_ERR PREFIX
917 "Unable to reallocate ACPI tables\n");
918 goto error0;
919 }
920
921 status = acpi_initialize_subsystem();
922 if (ACPI_FAILURE(status)) {
923 printk(KERN_ERR PREFIX
924 "Unable to initialize the ACPI Interpreter\n");
925 goto error0;
926 }
927
928 status = acpi_load_tables();
929 if (ACPI_FAILURE(status)) {
930 printk(KERN_ERR PREFIX
931 "Unable to load the System Description Tables\n");
932 goto error0;
933 }
934
935#ifdef CONFIG_X86
936 if (!acpi_ioapic) {
937 /* compatible (0) means level (3) */
938 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
939 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
940 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
941 }
942 /* Set PIC-mode SCI trigger type */
943 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
944 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
945 } else {
946 /*
947 * now that acpi_gbl_FADT is initialized,
948 * update it with result from INT_SRC_OVR parsing
949 */
950 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
951 }
952#endif
953 return;
954
955 error0:
956 disable_acpi();
957}
958
959/**
960 * acpi_subsystem_init - Finalize the early initialization of ACPI.
961 *
962 * Switch over the platform to the ACPI mode (if possible), initialize the
963 * handling of ACPI events, install the interrupt and global lock handlers.
964 *
965 * Doing this too early is generally unsafe, but at the same time it needs to be
966 * done before all things that really depend on ACPI. The right spot appears to
967 * be before finalizing the EFI initialization.
968 */
969void __init acpi_subsystem_init(void)
970{
971 acpi_status status;
972
973 if (acpi_disabled)
974 return;
975
976 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
977 if (ACPI_FAILURE(status)) {
978 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
979 disable_acpi();
980 } else {
981 /*
982 * If the system is using ACPI then we can be reasonably
983 * confident that any regulators are managed by the firmware
984 * so tell the regulator core it has everything it needs to
985 * know.
986 */
987 regulator_has_full_constraints();
988 }
989}
990
991static int __init acpi_bus_init(void)
992{
993 int result;
994 acpi_status status;
995
996 acpi_os_initialize1();
997
998 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
999 if (ACPI_FAILURE(status)) {
1000 printk(KERN_ERR PREFIX
1001 "Unable to start the ACPI Interpreter\n");
1002 goto error1;
1003 }
1004
1005 /*
1006 * ACPI 2.0 requires the EC driver to be loaded and work before
1007 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
1008 * is called).
1009 *
1010 * This is accomplished by looking for the ECDT table, and getting
1011 * the EC parameters out of that.
1012 */
1013 status = acpi_ec_ecdt_probe();
1014 /* Ignore result. Not having an ECDT is not fatal. */
1015
1016 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1017 if (ACPI_FAILURE(status)) {
1018 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1019 goto error1;
1020 }
1021
1022 /* Set capability bits for _OSC under processor scope */
1023 acpi_early_processor_osc();
1024
1025 /*
1026 * _OSC method may exist in module level code,
1027 * so it must be run after ACPI_FULL_INITIALIZATION
1028 */
1029 acpi_bus_osc_support();
1030
1031 /*
1032 * _PDC control method may load dynamic SSDT tables,
1033 * and we need to install the table handler before that.
1034 */
1035 acpi_sysfs_init();
1036
1037 acpi_early_processor_set_pdc();
1038
1039 /*
1040 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1041 * is necessary to enable it as early as possible.
1042 */
1043 acpi_boot_ec_enable();
1044
1045 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1046
1047 /* Initialize sleep structures */
1048 acpi_sleep_init();
1049
1050 /*
1051 * Get the system interrupt model and evaluate \_PIC.
1052 */
1053 result = acpi_bus_init_irq();
1054 if (result)
1055 goto error1;
1056
1057 /*
1058 * Register the for all standard device notifications.
1059 */
1060 status =
1061 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1062 &acpi_bus_notify, NULL);
1063 if (ACPI_FAILURE(status)) {
1064 printk(KERN_ERR PREFIX
1065 "Unable to register for device notifications\n");
1066 goto error1;
1067 }
1068
1069 /*
1070 * Create the top ACPI proc directory
1071 */
1072 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1073
1074 result = bus_register(&acpi_bus_type);
1075 if (!result)
1076 return 0;
1077
1078 /* Mimic structured exception handling */
1079 error1:
1080 acpi_terminate();
1081 return -ENODEV;
1082}
1083
1084struct kobject *acpi_kobj;
1085EXPORT_SYMBOL_GPL(acpi_kobj);
1086
1087static int __init acpi_init(void)
1088{
1089 int result;
1090
1091 if (acpi_disabled) {
1092 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1093 return -ENODEV;
1094 }
1095
1096 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1097 if (!acpi_kobj) {
1098 printk(KERN_WARNING "%s: kset create error\n", __func__);
1099 acpi_kobj = NULL;
1100 }
1101
1102 init_acpi_device_notify();
1103 result = acpi_bus_init();
1104 if (result) {
1105 disable_acpi();
1106 return result;
1107 }
1108
1109 pci_mmcfg_late_init();
1110 acpi_scan_init();
1111 acpi_ec_init();
1112 acpi_debugfs_init();
1113 acpi_sleep_proc_init();
1114 acpi_wakeup_device_init();
1115 acpi_debugger_init();
1116 return 0;
1117}
1118
1119subsys_initcall(acpi_init);