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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
69static int set_gbl_term_list(const struct dmi_system_id *id)
70{
71 acpi_gbl_execute_tables_as_methods = 1;
72 return 0;
73}
74
75static const struct dmi_system_id acpi_quirks_dmi_table[] __initconst = {
76 /*
77 * Touchpad on Dell XPS 9570/Precision M5530 doesn't work under I2C
78 * mode.
79 * https://bugzilla.kernel.org/show_bug.cgi?id=198515
80 */
81 {
82 .callback = set_gbl_term_list,
83 .ident = "Dell Precision M5530",
84 .matches = {
85 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
86 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M5530"),
87 },
88 },
89 {
90 .callback = set_gbl_term_list,
91 .ident = "Dell XPS 15 9570",
92 .matches = {
93 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
94 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"),
95 },
96 },
97 /*
98 * Invoke DSDT corruption work-around on all Toshiba Satellite.
99 * DSDT will be copied to memory.
100 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
101 */
102 {
103 .callback = set_copy_dsdt,
104 .ident = "TOSHIBA Satellite",
105 .matches = {
106 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
107 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
108 },
109 },
110 {}
111};
112#else
113static const struct dmi_system_id acpi_quirks_dmi_table[] __initconst = {
114 {}
115};
116#endif
117
118/* --------------------------------------------------------------------------
119 Device Management
120 -------------------------------------------------------------------------- */
121
122acpi_status acpi_bus_get_status_handle(acpi_handle handle,
123 unsigned long long *sta)
124{
125 acpi_status status;
126
127 status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
128 if (ACPI_SUCCESS(status))
129 return AE_OK;
130
131 if (status == AE_NOT_FOUND) {
132 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
133 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
134 return AE_OK;
135 }
136 return status;
137}
138EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
139
140int acpi_bus_get_status(struct acpi_device *device)
141{
142 acpi_status status;
143 unsigned long long sta;
144
145 if (acpi_device_always_present(device)) {
146 acpi_set_device_status(device, ACPI_STA_DEFAULT);
147 return 0;
148 }
149
150 /* Battery devices must have their deps met before calling _STA */
151 if (acpi_device_is_battery(device) && device->dep_unmet) {
152 acpi_set_device_status(device, 0);
153 return 0;
154 }
155
156 status = acpi_bus_get_status_handle(device->handle, &sta);
157 if (ACPI_FAILURE(status))
158 return -ENODEV;
159
160 acpi_set_device_status(device, sta);
161
162 if (device->status.functional && !device->status.present) {
163 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
164 "functional but not present;\n",
165 device->pnp.bus_id, (u32)sta));
166 }
167
168 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
169 device->pnp.bus_id, (u32)sta));
170 return 0;
171}
172EXPORT_SYMBOL(acpi_bus_get_status);
173
174void acpi_bus_private_data_handler(acpi_handle handle,
175 void *context)
176{
177 return;
178}
179EXPORT_SYMBOL(acpi_bus_private_data_handler);
180
181int acpi_bus_attach_private_data(acpi_handle handle, void *data)
182{
183 acpi_status status;
184
185 status = acpi_attach_data(handle,
186 acpi_bus_private_data_handler, data);
187 if (ACPI_FAILURE(status)) {
188 acpi_handle_debug(handle, "Error attaching device data\n");
189 return -ENODEV;
190 }
191
192 return 0;
193}
194EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
195
196int acpi_bus_get_private_data(acpi_handle handle, void **data)
197{
198 acpi_status status;
199
200 if (!*data)
201 return -EINVAL;
202
203 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
204 if (ACPI_FAILURE(status)) {
205 acpi_handle_debug(handle, "No context for object\n");
206 return -ENODEV;
207 }
208
209 return 0;
210}
211EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
212
213void acpi_bus_detach_private_data(acpi_handle handle)
214{
215 acpi_detach_data(handle, acpi_bus_private_data_handler);
216}
217EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
218
219static void acpi_print_osc_error(acpi_handle handle,
220 struct acpi_osc_context *context, char *error)
221{
222 int i;
223
224 acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
225
226 pr_debug("_OSC request data:");
227 for (i = 0; i < context->cap.length; i += sizeof(u32))
228 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
229
230 pr_debug("\n");
231}
232
233acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
234{
235 acpi_status status;
236 struct acpi_object_list input;
237 union acpi_object in_params[4];
238 union acpi_object *out_obj;
239 guid_t guid;
240 u32 errors;
241 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
242
243 if (!context)
244 return AE_ERROR;
245 if (guid_parse(context->uuid_str, &guid))
246 return AE_ERROR;
247 context->ret.length = ACPI_ALLOCATE_BUFFER;
248 context->ret.pointer = NULL;
249
250 /* Setting up input parameters */
251 input.count = 4;
252 input.pointer = in_params;
253 in_params[0].type = ACPI_TYPE_BUFFER;
254 in_params[0].buffer.length = 16;
255 in_params[0].buffer.pointer = (u8 *)&guid;
256 in_params[1].type = ACPI_TYPE_INTEGER;
257 in_params[1].integer.value = context->rev;
258 in_params[2].type = ACPI_TYPE_INTEGER;
259 in_params[2].integer.value = context->cap.length/sizeof(u32);
260 in_params[3].type = ACPI_TYPE_BUFFER;
261 in_params[3].buffer.length = context->cap.length;
262 in_params[3].buffer.pointer = context->cap.pointer;
263
264 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
265 if (ACPI_FAILURE(status))
266 return status;
267
268 if (!output.length)
269 return AE_NULL_OBJECT;
270
271 out_obj = output.pointer;
272 if (out_obj->type != ACPI_TYPE_BUFFER
273 || out_obj->buffer.length != context->cap.length) {
274 acpi_print_osc_error(handle, context,
275 "_OSC evaluation returned wrong type");
276 status = AE_TYPE;
277 goto out_kfree;
278 }
279 /* Need to ignore the bit0 in result code */
280 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
281 if (errors) {
282 if (errors & OSC_REQUEST_ERROR)
283 acpi_print_osc_error(handle, context,
284 "_OSC request failed");
285 if (errors & OSC_INVALID_UUID_ERROR)
286 acpi_print_osc_error(handle, context,
287 "_OSC invalid UUID");
288 if (errors & OSC_INVALID_REVISION_ERROR)
289 acpi_print_osc_error(handle, context,
290 "_OSC invalid revision");
291 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
292 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
293 & OSC_QUERY_ENABLE)
294 goto out_success;
295 status = AE_SUPPORT;
296 goto out_kfree;
297 }
298 status = AE_ERROR;
299 goto out_kfree;
300 }
301out_success:
302 context->ret.length = out_obj->buffer.length;
303 context->ret.pointer = kmemdup(out_obj->buffer.pointer,
304 context->ret.length, GFP_KERNEL);
305 if (!context->ret.pointer) {
306 status = AE_NO_MEMORY;
307 goto out_kfree;
308 }
309 status = AE_OK;
310
311out_kfree:
312 kfree(output.pointer);
313 if (status != AE_OK)
314 context->ret.pointer = NULL;
315 return status;
316}
317EXPORT_SYMBOL(acpi_run_osc);
318
319bool osc_sb_apei_support_acked;
320
321/*
322 * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
323 * OSPM supports platform coordinated low power idle(LPI) states
324 */
325bool osc_pc_lpi_support_confirmed;
326EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
327
328static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
329static void acpi_bus_osc_support(void)
330{
331 u32 capbuf[2];
332 struct acpi_osc_context context = {
333 .uuid_str = sb_uuid_str,
334 .rev = 1,
335 .cap.length = 8,
336 .cap.pointer = capbuf,
337 };
338 acpi_handle handle;
339
340 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
341 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
342 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
343 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
344 if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
345 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
346
347 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
348 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
349
350#ifdef CONFIG_X86
351 if (boot_cpu_has(X86_FEATURE_HWP)) {
352 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
353 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
354 }
355#endif
356
357 if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
358 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
359
360 if (!ghes_disable)
361 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
362 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
363 return;
364 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
365 u32 *capbuf_ret = context.ret.pointer;
366 if (context.ret.length > OSC_SUPPORT_DWORD) {
367 osc_sb_apei_support_acked =
368 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
369 osc_pc_lpi_support_confirmed =
370 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
371 }
372 kfree(context.ret.pointer);
373 }
374 /* do we need to check other returned cap? Sounds no */
375}
376
377/* --------------------------------------------------------------------------
378 Notification Handling
379 -------------------------------------------------------------------------- */
380
381/**
382 * acpi_bus_notify
383 * ---------------
384 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
385 */
386static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
387{
388 struct acpi_device *adev;
389 struct acpi_driver *driver;
390 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
391 bool hotplug_event = false;
392
393 switch (type) {
394 case ACPI_NOTIFY_BUS_CHECK:
395 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
396 hotplug_event = true;
397 break;
398
399 case ACPI_NOTIFY_DEVICE_CHECK:
400 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
401 hotplug_event = true;
402 break;
403
404 case ACPI_NOTIFY_DEVICE_WAKE:
405 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
406 break;
407
408 case ACPI_NOTIFY_EJECT_REQUEST:
409 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
410 hotplug_event = true;
411 break;
412
413 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
414 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
415 /* TBD: Exactly what does 'light' mean? */
416 break;
417
418 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
419 acpi_handle_err(handle, "Device cannot be configured due "
420 "to a frequency mismatch\n");
421 break;
422
423 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
424 acpi_handle_err(handle, "Device cannot be configured due "
425 "to a bus mode mismatch\n");
426 break;
427
428 case ACPI_NOTIFY_POWER_FAULT:
429 acpi_handle_err(handle, "Device has suffered a power fault\n");
430 break;
431
432 default:
433 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
434 break;
435 }
436
437 adev = acpi_bus_get_acpi_device(handle);
438 if (!adev)
439 goto err;
440
441 driver = adev->driver;
442 if (driver && driver->ops.notify &&
443 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
444 driver->ops.notify(adev, type);
445
446 if (!hotplug_event) {
447 acpi_bus_put_acpi_device(adev);
448 return;
449 }
450
451 if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
452 return;
453
454 acpi_bus_put_acpi_device(adev);
455
456 err:
457 acpi_evaluate_ost(handle, type, ost_code, NULL);
458}
459
460static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
461{
462 struct acpi_device *device = data;
463
464 device->driver->ops.notify(device, event);
465}
466
467static void acpi_device_notify_fixed(void *data)
468{
469 struct acpi_device *device = data;
470
471 /* Fixed hardware devices have no handles */
472 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
473}
474
475static u32 acpi_device_fixed_event(void *data)
476{
477 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
478 return ACPI_INTERRUPT_HANDLED;
479}
480
481static int acpi_device_install_notify_handler(struct acpi_device *device)
482{
483 acpi_status status;
484
485 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
486 status =
487 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
488 acpi_device_fixed_event,
489 device);
490 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
491 status =
492 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
493 acpi_device_fixed_event,
494 device);
495 else
496 status = acpi_install_notify_handler(device->handle,
497 ACPI_DEVICE_NOTIFY,
498 acpi_device_notify,
499 device);
500
501 if (ACPI_FAILURE(status))
502 return -EINVAL;
503 return 0;
504}
505
506static void acpi_device_remove_notify_handler(struct acpi_device *device)
507{
508 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
509 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
510 acpi_device_fixed_event);
511 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
512 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
513 acpi_device_fixed_event);
514 else
515 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
516 acpi_device_notify);
517}
518
519/* Handle events targeting \_SB device (at present only graceful shutdown) */
520
521#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
522#define ACPI_SB_INDICATE_INTERVAL 10000
523
524static void sb_notify_work(struct work_struct *dummy)
525{
526 acpi_handle sb_handle;
527
528 orderly_poweroff(true);
529
530 /*
531 * After initiating graceful shutdown, the ACPI spec requires OSPM
532 * to evaluate _OST method once every 10seconds to indicate that
533 * the shutdown is in progress
534 */
535 acpi_get_handle(NULL, "\\_SB", &sb_handle);
536 while (1) {
537 pr_info("Graceful shutdown in progress.\n");
538 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
539 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
540 msleep(ACPI_SB_INDICATE_INTERVAL);
541 }
542}
543
544static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
545{
546 static DECLARE_WORK(acpi_sb_work, sb_notify_work);
547
548 if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
549 if (!work_busy(&acpi_sb_work))
550 schedule_work(&acpi_sb_work);
551 } else
552 pr_warn("event %x is not supported by \\_SB device\n", event);
553}
554
555static int __init acpi_setup_sb_notify_handler(void)
556{
557 acpi_handle sb_handle;
558
559 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
560 return -ENXIO;
561
562 if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
563 acpi_sb_notify, NULL)))
564 return -EINVAL;
565
566 return 0;
567}
568
569/* --------------------------------------------------------------------------
570 Device Matching
571 -------------------------------------------------------------------------- */
572
573/**
574 * acpi_get_first_physical_node - Get first physical node of an ACPI device
575 * @adev: ACPI device in question
576 *
577 * Return: First physical node of ACPI device @adev
578 */
579struct device *acpi_get_first_physical_node(struct acpi_device *adev)
580{
581 struct mutex *physical_node_lock = &adev->physical_node_lock;
582 struct device *phys_dev;
583
584 mutex_lock(physical_node_lock);
585 if (list_empty(&adev->physical_node_list)) {
586 phys_dev = NULL;
587 } else {
588 const struct acpi_device_physical_node *node;
589
590 node = list_first_entry(&adev->physical_node_list,
591 struct acpi_device_physical_node, node);
592
593 phys_dev = node->dev;
594 }
595 mutex_unlock(physical_node_lock);
596 return phys_dev;
597}
598
599static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
600 const struct device *dev)
601{
602 const struct device *phys_dev = acpi_get_first_physical_node(adev);
603
604 return phys_dev && phys_dev == dev ? adev : NULL;
605}
606
607/**
608 * acpi_device_is_first_physical_node - Is given dev first physical node
609 * @adev: ACPI companion device
610 * @dev: Physical device to check
611 *
612 * Function checks if given @dev is the first physical devices attached to
613 * the ACPI companion device. This distinction is needed in some cases
614 * where the same companion device is shared between many physical devices.
615 *
616 * Note that the caller have to provide valid @adev pointer.
617 */
618bool acpi_device_is_first_physical_node(struct acpi_device *adev,
619 const struct device *dev)
620{
621 return !!acpi_primary_dev_companion(adev, dev);
622}
623
624/*
625 * acpi_companion_match() - Can we match via ACPI companion device
626 * @dev: Device in question
627 *
628 * Check if the given device has an ACPI companion and if that companion has
629 * a valid list of PNP IDs, and if the device is the first (primary) physical
630 * device associated with it. Return the companion pointer if that's the case
631 * or NULL otherwise.
632 *
633 * If multiple physical devices are attached to a single ACPI companion, we need
634 * to be careful. The usage scenario for this kind of relationship is that all
635 * of the physical devices in question use resources provided by the ACPI
636 * companion. A typical case is an MFD device where all the sub-devices share
637 * the parent's ACPI companion. In such cases we can only allow the primary
638 * (first) physical device to be matched with the help of the companion's PNP
639 * IDs.
640 *
641 * Additional physical devices sharing the ACPI companion can still use
642 * resources available from it but they will be matched normally using functions
643 * provided by their bus types (and analogously for their modalias).
644 */
645struct acpi_device *acpi_companion_match(const struct device *dev)
646{
647 struct acpi_device *adev;
648
649 adev = ACPI_COMPANION(dev);
650 if (!adev)
651 return NULL;
652
653 if (list_empty(&adev->pnp.ids))
654 return NULL;
655
656 return acpi_primary_dev_companion(adev, dev);
657}
658
659/**
660 * acpi_of_match_device - Match device object using the "compatible" property.
661 * @adev: ACPI device object to match.
662 * @of_match_table: List of device IDs to match against.
663 * @of_id: OF ID if matched
664 *
665 * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
666 * identifiers and a _DSD object with the "compatible" property, use that
667 * property to match against the given list of identifiers.
668 */
669static bool acpi_of_match_device(struct acpi_device *adev,
670 const struct of_device_id *of_match_table,
671 const struct of_device_id **of_id)
672{
673 const union acpi_object *of_compatible, *obj;
674 int i, nval;
675
676 if (!adev)
677 return false;
678
679 of_compatible = adev->data.of_compatible;
680 if (!of_match_table || !of_compatible)
681 return false;
682
683 if (of_compatible->type == ACPI_TYPE_PACKAGE) {
684 nval = of_compatible->package.count;
685 obj = of_compatible->package.elements;
686 } else { /* Must be ACPI_TYPE_STRING. */
687 nval = 1;
688 obj = of_compatible;
689 }
690 /* Now we can look for the driver DT compatible strings */
691 for (i = 0; i < nval; i++, obj++) {
692 const struct of_device_id *id;
693
694 for (id = of_match_table; id->compatible[0]; id++)
695 if (!strcasecmp(obj->string.pointer, id->compatible)) {
696 if (of_id)
697 *of_id = id;
698 return true;
699 }
700 }
701
702 return false;
703}
704
705static bool acpi_of_modalias(struct acpi_device *adev,
706 char *modalias, size_t len)
707{
708 const union acpi_object *of_compatible;
709 const union acpi_object *obj;
710 const char *str, *chr;
711
712 of_compatible = adev->data.of_compatible;
713 if (!of_compatible)
714 return false;
715
716 if (of_compatible->type == ACPI_TYPE_PACKAGE)
717 obj = of_compatible->package.elements;
718 else /* Must be ACPI_TYPE_STRING. */
719 obj = of_compatible;
720
721 str = obj->string.pointer;
722 chr = strchr(str, ',');
723 strlcpy(modalias, chr ? chr + 1 : str, len);
724
725 return true;
726}
727
728/**
729 * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
730 * @adev: ACPI device object to match
731 * @default_id: ID string to use as default if no compatible string found
732 * @modalias: Pointer to buffer that modalias value will be copied into
733 * @len: Length of modalias buffer
734 *
735 * This is a counterpart of of_modalias_node() for struct acpi_device objects.
736 * If there is a compatible string for @adev, it will be copied to @modalias
737 * with the vendor prefix stripped; otherwise, @default_id will be used.
738 */
739void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
740 char *modalias, size_t len)
741{
742 if (!acpi_of_modalias(adev, modalias, len))
743 strlcpy(modalias, default_id, len);
744}
745EXPORT_SYMBOL_GPL(acpi_set_modalias);
746
747static bool __acpi_match_device_cls(const struct acpi_device_id *id,
748 struct acpi_hardware_id *hwid)
749{
750 int i, msk, byte_shift;
751 char buf[3];
752
753 if (!id->cls)
754 return false;
755
756 /* Apply class-code bitmask, before checking each class-code byte */
757 for (i = 1; i <= 3; i++) {
758 byte_shift = 8 * (3 - i);
759 msk = (id->cls_msk >> byte_shift) & 0xFF;
760 if (!msk)
761 continue;
762
763 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
764 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
765 return false;
766 }
767 return true;
768}
769
770static bool __acpi_match_device(struct acpi_device *device,
771 const struct acpi_device_id *acpi_ids,
772 const struct of_device_id *of_ids,
773 const struct acpi_device_id **acpi_id,
774 const struct of_device_id **of_id)
775{
776 const struct acpi_device_id *id;
777 struct acpi_hardware_id *hwid;
778
779 /*
780 * If the device is not present, it is unnecessary to load device
781 * driver for it.
782 */
783 if (!device || !device->status.present)
784 return false;
785
786 list_for_each_entry(hwid, &device->pnp.ids, list) {
787 /* First, check the ACPI/PNP IDs provided by the caller. */
788 if (acpi_ids) {
789 for (id = acpi_ids; id->id[0] || id->cls; id++) {
790 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
791 goto out_acpi_match;
792 if (id->cls && __acpi_match_device_cls(id, hwid))
793 goto out_acpi_match;
794 }
795 }
796
797 /*
798 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
799 * "compatible" property if found.
800 */
801 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
802 return acpi_of_match_device(device, of_ids, of_id);
803 }
804 return false;
805
806out_acpi_match:
807 if (acpi_id)
808 *acpi_id = id;
809 return true;
810}
811
812/**
813 * acpi_match_device - Match a struct device against a given list of ACPI IDs
814 * @ids: Array of struct acpi_device_id object to match against.
815 * @dev: The device structure to match.
816 *
817 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
818 * object for that handle and use that object to match against a given list of
819 * device IDs.
820 *
821 * Return a pointer to the first matching ID on success or %NULL on failure.
822 */
823const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
824 const struct device *dev)
825{
826 const struct acpi_device_id *id = NULL;
827
828 __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
829 return id;
830}
831EXPORT_SYMBOL_GPL(acpi_match_device);
832
833const void *acpi_device_get_match_data(const struct device *dev)
834{
835 const struct acpi_device_id *match;
836
837 match = acpi_match_device(dev->driver->acpi_match_table, dev);
838 if (!match)
839 return NULL;
840
841 return (const void *)match->driver_data;
842}
843EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
844
845int acpi_match_device_ids(struct acpi_device *device,
846 const struct acpi_device_id *ids)
847{
848 return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
849}
850EXPORT_SYMBOL(acpi_match_device_ids);
851
852bool acpi_driver_match_device(struct device *dev,
853 const struct device_driver *drv)
854{
855 if (!drv->acpi_match_table)
856 return acpi_of_match_device(ACPI_COMPANION(dev),
857 drv->of_match_table,
858 NULL);
859
860 return __acpi_match_device(acpi_companion_match(dev),
861 drv->acpi_match_table, drv->of_match_table,
862 NULL, NULL);
863}
864EXPORT_SYMBOL_GPL(acpi_driver_match_device);
865
866/* --------------------------------------------------------------------------
867 ACPI Driver Management
868 -------------------------------------------------------------------------- */
869
870/**
871 * acpi_bus_register_driver - register a driver with the ACPI bus
872 * @driver: driver being registered
873 *
874 * Registers a driver with the ACPI bus. Searches the namespace for all
875 * devices that match the driver's criteria and binds. Returns zero for
876 * success or a negative error status for failure.
877 */
878int acpi_bus_register_driver(struct acpi_driver *driver)
879{
880 int ret;
881
882 if (acpi_disabled)
883 return -ENODEV;
884 driver->drv.name = driver->name;
885 driver->drv.bus = &acpi_bus_type;
886 driver->drv.owner = driver->owner;
887
888 ret = driver_register(&driver->drv);
889 return ret;
890}
891
892EXPORT_SYMBOL(acpi_bus_register_driver);
893
894/**
895 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
896 * @driver: driver to unregister
897 *
898 * Unregisters a driver with the ACPI bus. Searches the namespace for all
899 * devices that match the driver's criteria and unbinds.
900 */
901void acpi_bus_unregister_driver(struct acpi_driver *driver)
902{
903 driver_unregister(&driver->drv);
904}
905
906EXPORT_SYMBOL(acpi_bus_unregister_driver);
907
908/* --------------------------------------------------------------------------
909 ACPI Bus operations
910 -------------------------------------------------------------------------- */
911
912static int acpi_bus_match(struct device *dev, struct device_driver *drv)
913{
914 struct acpi_device *acpi_dev = to_acpi_device(dev);
915 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
916
917 return acpi_dev->flags.match_driver
918 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
919}
920
921static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
922{
923 return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
924}
925
926static int acpi_device_probe(struct device *dev)
927{
928 struct acpi_device *acpi_dev = to_acpi_device(dev);
929 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
930 int ret;
931
932 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
933 return -EINVAL;
934
935 if (!acpi_drv->ops.add)
936 return -ENOSYS;
937
938 ret = acpi_drv->ops.add(acpi_dev);
939 if (ret)
940 return ret;
941
942 acpi_dev->driver = acpi_drv;
943 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
944 "Driver [%s] successfully bound to device [%s]\n",
945 acpi_drv->name, acpi_dev->pnp.bus_id));
946
947 if (acpi_drv->ops.notify) {
948 ret = acpi_device_install_notify_handler(acpi_dev);
949 if (ret) {
950 if (acpi_drv->ops.remove)
951 acpi_drv->ops.remove(acpi_dev);
952
953 acpi_dev->driver = NULL;
954 acpi_dev->driver_data = NULL;
955 return ret;
956 }
957 }
958
959 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
960 acpi_drv->name, acpi_dev->pnp.bus_id));
961 get_device(dev);
962 return 0;
963}
964
965static int acpi_device_remove(struct device * dev)
966{
967 struct acpi_device *acpi_dev = to_acpi_device(dev);
968 struct acpi_driver *acpi_drv = acpi_dev->driver;
969
970 if (acpi_drv) {
971 if (acpi_drv->ops.notify)
972 acpi_device_remove_notify_handler(acpi_dev);
973 if (acpi_drv->ops.remove)
974 acpi_drv->ops.remove(acpi_dev);
975 }
976 acpi_dev->driver = NULL;
977 acpi_dev->driver_data = NULL;
978
979 put_device(dev);
980 return 0;
981}
982
983struct bus_type acpi_bus_type = {
984 .name = "acpi",
985 .match = acpi_bus_match,
986 .probe = acpi_device_probe,
987 .remove = acpi_device_remove,
988 .uevent = acpi_device_uevent,
989};
990
991/* --------------------------------------------------------------------------
992 Initialization/Cleanup
993 -------------------------------------------------------------------------- */
994
995static int __init acpi_bus_init_irq(void)
996{
997 acpi_status status;
998 char *message = NULL;
999
1000
1001 /*
1002 * Let the system know what interrupt model we are using by
1003 * evaluating the \_PIC object, if exists.
1004 */
1005
1006 switch (acpi_irq_model) {
1007 case ACPI_IRQ_MODEL_PIC:
1008 message = "PIC";
1009 break;
1010 case ACPI_IRQ_MODEL_IOAPIC:
1011 message = "IOAPIC";
1012 break;
1013 case ACPI_IRQ_MODEL_IOSAPIC:
1014 message = "IOSAPIC";
1015 break;
1016 case ACPI_IRQ_MODEL_GIC:
1017 message = "GIC";
1018 break;
1019 case ACPI_IRQ_MODEL_PLATFORM:
1020 message = "platform specific model";
1021 break;
1022 default:
1023 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
1024 return -ENODEV;
1025 }
1026
1027 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
1028
1029 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1030 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1031 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1032 return -ENODEV;
1033 }
1034
1035 return 0;
1036}
1037
1038/**
1039 * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1040 *
1041 * The ACPI tables are accessible after this, but the handling of events has not
1042 * been initialized and the global lock is not available yet, so AML should not
1043 * be executed at this point.
1044 *
1045 * Doing this before switching the EFI runtime services to virtual mode allows
1046 * the EfiBootServices memory to be freed slightly earlier on boot.
1047 */
1048void __init acpi_early_init(void)
1049{
1050 acpi_status status;
1051
1052 if (acpi_disabled)
1053 return;
1054
1055 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1056
1057 /* enable workarounds, unless strict ACPI spec. compliance */
1058 if (!acpi_strict)
1059 acpi_gbl_enable_interpreter_slack = TRUE;
1060
1061 acpi_permanent_mmap = true;
1062
1063 /* Check machine-specific quirks */
1064 dmi_check_system(acpi_quirks_dmi_table);
1065
1066 status = acpi_reallocate_root_table();
1067 if (ACPI_FAILURE(status)) {
1068 printk(KERN_ERR PREFIX
1069 "Unable to reallocate ACPI tables\n");
1070 goto error0;
1071 }
1072
1073 status = acpi_initialize_subsystem();
1074 if (ACPI_FAILURE(status)) {
1075 printk(KERN_ERR PREFIX
1076 "Unable to initialize the ACPI Interpreter\n");
1077 goto error0;
1078 }
1079
1080 if (!acpi_gbl_execute_tables_as_methods &&
1081 acpi_gbl_group_module_level_code) {
1082 status = acpi_load_tables();
1083 if (ACPI_FAILURE(status)) {
1084 printk(KERN_ERR PREFIX
1085 "Unable to load the System Description Tables\n");
1086 goto error0;
1087 }
1088 }
1089
1090#ifdef CONFIG_X86
1091 if (!acpi_ioapic) {
1092 /* compatible (0) means level (3) */
1093 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1094 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1095 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1096 }
1097 /* Set PIC-mode SCI trigger type */
1098 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1099 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1100 } else {
1101 /*
1102 * now that acpi_gbl_FADT is initialized,
1103 * update it with result from INT_SRC_OVR parsing
1104 */
1105 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1106 }
1107#endif
1108 return;
1109
1110 error0:
1111 disable_acpi();
1112}
1113
1114/**
1115 * acpi_subsystem_init - Finalize the early initialization of ACPI.
1116 *
1117 * Switch over the platform to the ACPI mode (if possible).
1118 *
1119 * Doing this too early is generally unsafe, but at the same time it needs to be
1120 * done before all things that really depend on ACPI. The right spot appears to
1121 * be before finalizing the EFI initialization.
1122 */
1123void __init acpi_subsystem_init(void)
1124{
1125 acpi_status status;
1126
1127 if (acpi_disabled)
1128 return;
1129
1130 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1131 if (ACPI_FAILURE(status)) {
1132 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1133 disable_acpi();
1134 } else {
1135 /*
1136 * If the system is using ACPI then we can be reasonably
1137 * confident that any regulators are managed by the firmware
1138 * so tell the regulator core it has everything it needs to
1139 * know.
1140 */
1141 regulator_has_full_constraints();
1142 }
1143}
1144
1145static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1146{
1147 acpi_scan_table_handler(event, table, context);
1148
1149 return acpi_sysfs_table_handler(event, table, context);
1150}
1151
1152static int __init acpi_bus_init(void)
1153{
1154 int result;
1155 acpi_status status;
1156
1157 acpi_os_initialize1();
1158
1159 /*
1160 * ACPI 2.0 requires the EC driver to be loaded and work before
1161 * the EC device is found in the namespace (i.e. before
1162 * acpi_load_tables() is called).
1163 *
1164 * This is accomplished by looking for the ECDT table, and getting
1165 * the EC parameters out of that.
1166 */
1167 status = acpi_ec_ecdt_probe();
1168 /* Ignore result. Not having an ECDT is not fatal. */
1169
1170 if (acpi_gbl_execute_tables_as_methods ||
1171 !acpi_gbl_group_module_level_code) {
1172 status = acpi_load_tables();
1173 if (ACPI_FAILURE(status)) {
1174 printk(KERN_ERR PREFIX
1175 "Unable to load the System Description Tables\n");
1176 goto error1;
1177 }
1178 }
1179
1180 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1181 if (ACPI_FAILURE(status)) {
1182 printk(KERN_ERR PREFIX
1183 "Unable to start the ACPI Interpreter\n");
1184 goto error1;
1185 }
1186
1187 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1188 if (ACPI_FAILURE(status)) {
1189 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1190 goto error1;
1191 }
1192
1193 /* Set capability bits for _OSC under processor scope */
1194 acpi_early_processor_osc();
1195
1196 /*
1197 * _OSC method may exist in module level code,
1198 * so it must be run after ACPI_FULL_INITIALIZATION
1199 */
1200 acpi_bus_osc_support();
1201
1202 /*
1203 * _PDC control method may load dynamic SSDT tables,
1204 * and we need to install the table handler before that.
1205 */
1206 status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1207
1208 acpi_sysfs_init();
1209
1210 acpi_early_processor_set_pdc();
1211
1212 /*
1213 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1214 * is necessary to enable it as early as possible.
1215 */
1216 acpi_ec_dsdt_probe();
1217
1218 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1219
1220 /* Initialize sleep structures */
1221 acpi_sleep_init();
1222
1223 /*
1224 * Get the system interrupt model and evaluate \_PIC.
1225 */
1226 result = acpi_bus_init_irq();
1227 if (result)
1228 goto error1;
1229
1230 /*
1231 * Register the for all standard device notifications.
1232 */
1233 status =
1234 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1235 &acpi_bus_notify, NULL);
1236 if (ACPI_FAILURE(status)) {
1237 printk(KERN_ERR PREFIX
1238 "Unable to register for device notifications\n");
1239 goto error1;
1240 }
1241
1242 /*
1243 * Create the top ACPI proc directory
1244 */
1245 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1246
1247 result = bus_register(&acpi_bus_type);
1248 if (!result)
1249 return 0;
1250
1251 /* Mimic structured exception handling */
1252 error1:
1253 acpi_terminate();
1254 return -ENODEV;
1255}
1256
1257struct kobject *acpi_kobj;
1258EXPORT_SYMBOL_GPL(acpi_kobj);
1259
1260static int __init acpi_init(void)
1261{
1262 int result;
1263
1264 if (acpi_disabled) {
1265 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1266 return -ENODEV;
1267 }
1268
1269 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1270 if (!acpi_kobj) {
1271 printk(KERN_WARNING "%s: kset create error\n", __func__);
1272 acpi_kobj = NULL;
1273 }
1274
1275 init_acpi_device_notify();
1276 result = acpi_bus_init();
1277 if (result) {
1278 disable_acpi();
1279 return result;
1280 }
1281
1282 pci_mmcfg_late_init();
1283 acpi_iort_init();
1284 acpi_scan_init();
1285 acpi_ec_init();
1286 acpi_debugfs_init();
1287 acpi_sleep_proc_init();
1288 acpi_wakeup_device_init();
1289 acpi_debugger_init();
1290 acpi_setup_sb_notify_handler();
1291 return 0;
1292}
1293
1294subsys_initcall(acpi_init);