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 #include <linux/regulator/machine.h>
37 #ifdef CONFIG_X86
38 #include <asm/mpspec.h>
39 #endif
40 #include <linux/pci.h>
41 #include <acpi/acpi_bus.h>
42 #include <acpi/acpi_drivers.h>
43 #include <acpi/apei.h>
44 #include <linux/dmi.h>
45 #include <linux/suspend.h>
46
47 #include "internal.h"
48
49 #define _COMPONENT ACPI_BUS_COMPONENT
50 ACPI_MODULE_NAME("bus");
51
52 struct acpi_device *acpi_root;
53 struct proc_dir_entry *acpi_root_dir;
54 EXPORT_SYMBOL(acpi_root_dir);
55
56 #define STRUCT_TO_INT(s) (*((int*)&s))
57
58
59 #ifdef CONFIG_X86
60 #ifdef CONFIG_ACPI_CUSTOM_DSDT
set_copy_dsdt(const struct dmi_system_id * id)61 static inline int set_copy_dsdt(const struct dmi_system_id *id)
62 {
63 return 0;
64 }
65 #else
set_copy_dsdt(const struct dmi_system_id * id)66 static int set_copy_dsdt(const struct dmi_system_id *id)
67 {
68 printk(KERN_NOTICE "%s detected - "
69 "force copy of DSDT to local memory\n", id->ident);
70 acpi_gbl_copy_dsdt_locally = 1;
71 return 0;
72 }
73 #endif
74
75 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
76 /*
77 * Invoke DSDT corruption work-around on all Toshiba Satellite.
78 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
79 */
80 {
81 .callback = set_copy_dsdt,
82 .ident = "TOSHIBA Satellite",
83 .matches = {
84 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
85 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
86 },
87 },
88 {}
89 };
90 #else
91 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
92 {}
93 };
94 #endif
95
96 /* --------------------------------------------------------------------------
97 Device Management
98 -------------------------------------------------------------------------- */
99
acpi_bus_get_device(acpi_handle handle,struct acpi_device ** device)100 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
101 {
102 acpi_status status = AE_OK;
103
104
105 if (!device)
106 return -EINVAL;
107
108 /* TBD: Support fixed-feature devices */
109
110 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
111 if (ACPI_FAILURE(status) || !*device) {
112 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
113 handle));
114 return -ENODEV;
115 }
116
117 return 0;
118 }
119
120 EXPORT_SYMBOL(acpi_bus_get_device);
121
acpi_bus_get_status_handle(acpi_handle handle,unsigned long long * sta)122 acpi_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 }
138
acpi_bus_get_status(struct acpi_device * device)139 int acpi_bus_get_status(struct acpi_device *device)
140 {
141 acpi_status status;
142 unsigned long long sta;
143
144 status = acpi_bus_get_status_handle(device->handle, &sta);
145 if (ACPI_FAILURE(status))
146 return -ENODEV;
147
148 STRUCT_TO_INT(device->status) = (int) sta;
149
150 if (device->status.functional && !device->status.present) {
151 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
152 "functional but not present;\n",
153 device->pnp.bus_id,
154 (u32) STRUCT_TO_INT(device->status)));
155 }
156
157 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
158 device->pnp.bus_id,
159 (u32) STRUCT_TO_INT(device->status)));
160 return 0;
161 }
162 EXPORT_SYMBOL(acpi_bus_get_status);
163
acpi_bus_private_data_handler(acpi_handle handle,void * context)164 void acpi_bus_private_data_handler(acpi_handle handle,
165 void *context)
166 {
167 return;
168 }
169 EXPORT_SYMBOL(acpi_bus_private_data_handler);
170
acpi_bus_get_private_data(acpi_handle handle,void ** data)171 int acpi_bus_get_private_data(acpi_handle handle, void **data)
172 {
173 acpi_status status = AE_OK;
174
175 if (!*data)
176 return -EINVAL;
177
178 status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
179 if (ACPI_FAILURE(status) || !*data) {
180 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
181 handle));
182 return -ENODEV;
183 }
184
185 return 0;
186 }
187 EXPORT_SYMBOL(acpi_bus_get_private_data);
188
189 /* --------------------------------------------------------------------------
190 Power Management
191 -------------------------------------------------------------------------- */
192
__acpi_bus_get_power(struct acpi_device * device,int * state)193 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
194 {
195 int result = 0;
196 acpi_status status = 0;
197 unsigned long long psc = 0;
198
199 if (!device || !state)
200 return -EINVAL;
201
202 *state = ACPI_STATE_UNKNOWN;
203
204 if (device->flags.power_manageable) {
205 /*
206 * Get the device's power state either directly (via _PSC) or
207 * indirectly (via power resources).
208 */
209 if (device->power.flags.power_resources) {
210 result = acpi_power_get_inferred_state(device, state);
211 if (result)
212 return result;
213 } else if (device->power.flags.explicit_get) {
214 status = acpi_evaluate_integer(device->handle, "_PSC",
215 NULL, &psc);
216 if (ACPI_FAILURE(status))
217 return -ENODEV;
218 *state = (int)psc;
219 }
220 } else {
221 /* TBD: Non-recursive algorithm for walking up hierarchy. */
222 *state = device->parent ?
223 device->parent->power.state : ACPI_STATE_D0;
224 }
225
226 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
227 device->pnp.bus_id, *state));
228
229 return 0;
230 }
231
232
__acpi_bus_set_power(struct acpi_device * device,int state)233 static int __acpi_bus_set_power(struct acpi_device *device, int state)
234 {
235 int result = 0;
236 acpi_status status = AE_OK;
237 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
238
239 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
240 return -EINVAL;
241
242 /* Make sure this is a valid target state */
243
244 if (state == device->power.state) {
245 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
246 state));
247 return 0;
248 }
249
250 if (!device->power.states[state].flags.valid) {
251 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
252 return -ENODEV;
253 }
254 if (device->parent && (state < device->parent->power.state)) {
255 printk(KERN_WARNING PREFIX
256 "Cannot set device to a higher-powered"
257 " state than parent\n");
258 return -ENODEV;
259 }
260
261 /* For D3cold we should execute _PS3, not _PS4. */
262 if (state == ACPI_STATE_D3_COLD)
263 object_name[3] = '3';
264
265 /*
266 * Transition Power
267 * ----------------
268 * On transitions to a high-powered state we first apply power (via
269 * power resources) then evalute _PSx. Conversly for transitions to
270 * a lower-powered state.
271 */
272 if (state < device->power.state) {
273 if (device->power.flags.power_resources) {
274 result = acpi_power_transition(device, state);
275 if (result)
276 goto end;
277 }
278 if (device->power.states[state].flags.explicit_set) {
279 status = acpi_evaluate_object(device->handle,
280 object_name, NULL, NULL);
281 if (ACPI_FAILURE(status)) {
282 result = -ENODEV;
283 goto end;
284 }
285 }
286 } else {
287 if (device->power.states[state].flags.explicit_set) {
288 status = acpi_evaluate_object(device->handle,
289 object_name, NULL, NULL);
290 if (ACPI_FAILURE(status)) {
291 result = -ENODEV;
292 goto end;
293 }
294 }
295 if (device->power.flags.power_resources) {
296 result = acpi_power_transition(device, state);
297 if (result)
298 goto end;
299 }
300 }
301
302 end:
303 if (result)
304 printk(KERN_WARNING PREFIX
305 "Device [%s] failed to transition to D%d\n",
306 device->pnp.bus_id, state);
307 else {
308 device->power.state = state;
309 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
310 "Device [%s] transitioned to D%d\n",
311 device->pnp.bus_id, state));
312 }
313
314 return result;
315 }
316
317
acpi_bus_set_power(acpi_handle handle,int state)318 int acpi_bus_set_power(acpi_handle handle, int state)
319 {
320 struct acpi_device *device;
321 int result;
322
323 result = acpi_bus_get_device(handle, &device);
324 if (result)
325 return result;
326
327 if (!device->flags.power_manageable) {
328 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
329 "Device [%s] is not power manageable\n",
330 dev_name(&device->dev)));
331 return -ENODEV;
332 }
333
334 return __acpi_bus_set_power(device, state);
335 }
336 EXPORT_SYMBOL(acpi_bus_set_power);
337
338
acpi_bus_init_power(struct acpi_device * device)339 int acpi_bus_init_power(struct acpi_device *device)
340 {
341 int state;
342 int result;
343
344 if (!device)
345 return -EINVAL;
346
347 device->power.state = ACPI_STATE_UNKNOWN;
348
349 result = __acpi_bus_get_power(device, &state);
350 if (result)
351 return result;
352
353 if (device->power.flags.power_resources)
354 result = acpi_power_on_resources(device, state);
355
356 if (!result)
357 device->power.state = state;
358
359 return result;
360 }
361
362
acpi_bus_update_power(acpi_handle handle,int * state_p)363 int acpi_bus_update_power(acpi_handle handle, int *state_p)
364 {
365 struct acpi_device *device;
366 int state;
367 int result;
368
369 result = acpi_bus_get_device(handle, &device);
370 if (result)
371 return result;
372
373 result = __acpi_bus_get_power(device, &state);
374 if (result)
375 return result;
376
377 result = __acpi_bus_set_power(device, state);
378 if (!result && state_p)
379 *state_p = state;
380
381 return result;
382 }
383 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
384
385
acpi_bus_power_manageable(acpi_handle handle)386 bool acpi_bus_power_manageable(acpi_handle handle)
387 {
388 struct acpi_device *device;
389 int result;
390
391 result = acpi_bus_get_device(handle, &device);
392 return result ? false : device->flags.power_manageable;
393 }
394
395 EXPORT_SYMBOL(acpi_bus_power_manageable);
396
acpi_bus_can_wakeup(acpi_handle handle)397 bool acpi_bus_can_wakeup(acpi_handle handle)
398 {
399 struct acpi_device *device;
400 int result;
401
402 result = acpi_bus_get_device(handle, &device);
403 return result ? false : device->wakeup.flags.valid;
404 }
405
406 EXPORT_SYMBOL(acpi_bus_can_wakeup);
407
acpi_print_osc_error(acpi_handle handle,struct acpi_osc_context * context,char * error)408 static void acpi_print_osc_error(acpi_handle handle,
409 struct acpi_osc_context *context, char *error)
410 {
411 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
412 int i;
413
414 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
415 printk(KERN_DEBUG "%s\n", error);
416 else {
417 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
418 kfree(buffer.pointer);
419 }
420 printk(KERN_DEBUG"_OSC request data:");
421 for (i = 0; i < context->cap.length; i += sizeof(u32))
422 printk("%x ", *((u32 *)(context->cap.pointer + i)));
423 printk("\n");
424 }
425
acpi_str_to_uuid(char * str,u8 * uuid)426 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
427 {
428 int i;
429 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
430 24, 26, 28, 30, 32, 34};
431
432 if (strlen(str) != 36)
433 return AE_BAD_PARAMETER;
434 for (i = 0; i < 36; i++) {
435 if (i == 8 || i == 13 || i == 18 || i == 23) {
436 if (str[i] != '-')
437 return AE_BAD_PARAMETER;
438 } else if (!isxdigit(str[i]))
439 return AE_BAD_PARAMETER;
440 }
441 for (i = 0; i < 16; i++) {
442 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
443 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
444 }
445 return AE_OK;
446 }
447
acpi_run_osc(acpi_handle handle,struct acpi_osc_context * context)448 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
449 {
450 acpi_status status;
451 struct acpi_object_list input;
452 union acpi_object in_params[4];
453 union acpi_object *out_obj;
454 u8 uuid[16];
455 u32 errors;
456 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
457
458 if (!context)
459 return AE_ERROR;
460 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
461 return AE_ERROR;
462 context->ret.length = ACPI_ALLOCATE_BUFFER;
463 context->ret.pointer = NULL;
464
465 /* Setting up input parameters */
466 input.count = 4;
467 input.pointer = in_params;
468 in_params[0].type = ACPI_TYPE_BUFFER;
469 in_params[0].buffer.length = 16;
470 in_params[0].buffer.pointer = uuid;
471 in_params[1].type = ACPI_TYPE_INTEGER;
472 in_params[1].integer.value = context->rev;
473 in_params[2].type = ACPI_TYPE_INTEGER;
474 in_params[2].integer.value = context->cap.length/sizeof(u32);
475 in_params[3].type = ACPI_TYPE_BUFFER;
476 in_params[3].buffer.length = context->cap.length;
477 in_params[3].buffer.pointer = context->cap.pointer;
478
479 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
480 if (ACPI_FAILURE(status))
481 return status;
482
483 if (!output.length)
484 return AE_NULL_OBJECT;
485
486 out_obj = output.pointer;
487 if (out_obj->type != ACPI_TYPE_BUFFER
488 || out_obj->buffer.length != context->cap.length) {
489 acpi_print_osc_error(handle, context,
490 "_OSC evaluation returned wrong type");
491 status = AE_TYPE;
492 goto out_kfree;
493 }
494 /* Need to ignore the bit0 in result code */
495 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
496 if (errors) {
497 if (errors & OSC_REQUEST_ERROR)
498 acpi_print_osc_error(handle, context,
499 "_OSC request failed");
500 if (errors & OSC_INVALID_UUID_ERROR)
501 acpi_print_osc_error(handle, context,
502 "_OSC invalid UUID");
503 if (errors & OSC_INVALID_REVISION_ERROR)
504 acpi_print_osc_error(handle, context,
505 "_OSC invalid revision");
506 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
507 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
508 & OSC_QUERY_ENABLE)
509 goto out_success;
510 status = AE_SUPPORT;
511 goto out_kfree;
512 }
513 status = AE_ERROR;
514 goto out_kfree;
515 }
516 out_success:
517 context->ret.length = out_obj->buffer.length;
518 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
519 if (!context->ret.pointer) {
520 status = AE_NO_MEMORY;
521 goto out_kfree;
522 }
523 memcpy(context->ret.pointer, out_obj->buffer.pointer,
524 context->ret.length);
525 status = AE_OK;
526
527 out_kfree:
528 kfree(output.pointer);
529 if (status != AE_OK)
530 context->ret.pointer = NULL;
531 return status;
532 }
533 EXPORT_SYMBOL(acpi_run_osc);
534
535 bool osc_sb_apei_support_acked;
536 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
acpi_bus_osc_support(void)537 static void acpi_bus_osc_support(void)
538 {
539 u32 capbuf[2];
540 struct acpi_osc_context context = {
541 .uuid_str = sb_uuid_str,
542 .rev = 1,
543 .cap.length = 8,
544 .cap.pointer = capbuf,
545 };
546 acpi_handle handle;
547
548 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
549 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
550 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
551 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
552 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
553 #endif
554
555 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
556 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
557 #endif
558
559 if (!ghes_disable)
560 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
561 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
562 return;
563 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
564 u32 *capbuf_ret = context.ret.pointer;
565 if (context.ret.length > OSC_SUPPORT_TYPE)
566 osc_sb_apei_support_acked =
567 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
568 kfree(context.ret.pointer);
569 }
570 /* do we need to check other returned cap? Sounds no */
571 }
572
573 /* --------------------------------------------------------------------------
574 Event Management
575 -------------------------------------------------------------------------- */
576
577 #ifdef CONFIG_ACPI_PROC_EVENT
578 static DEFINE_SPINLOCK(acpi_bus_event_lock);
579
580 LIST_HEAD(acpi_bus_event_list);
581 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
582
583 extern int event_is_open;
584
acpi_bus_generate_proc_event4(const char * device_class,const char * bus_id,u8 type,int data)585 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
586 {
587 struct acpi_bus_event *event;
588 unsigned long flags = 0;
589
590 /* drop event on the floor if no one's listening */
591 if (!event_is_open)
592 return 0;
593
594 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
595 if (!event)
596 return -ENOMEM;
597
598 strcpy(event->device_class, device_class);
599 strcpy(event->bus_id, bus_id);
600 event->type = type;
601 event->data = data;
602
603 spin_lock_irqsave(&acpi_bus_event_lock, flags);
604 list_add_tail(&event->node, &acpi_bus_event_list);
605 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
606
607 wake_up_interruptible(&acpi_bus_event_queue);
608
609 return 0;
610
611 }
612
613 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
614
acpi_bus_generate_proc_event(struct acpi_device * device,u8 type,int data)615 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
616 {
617 if (!device)
618 return -EINVAL;
619 return acpi_bus_generate_proc_event4(device->pnp.device_class,
620 device->pnp.bus_id, type, data);
621 }
622
623 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
624
acpi_bus_receive_event(struct acpi_bus_event * event)625 int acpi_bus_receive_event(struct acpi_bus_event *event)
626 {
627 unsigned long flags = 0;
628 struct acpi_bus_event *entry = NULL;
629
630 DECLARE_WAITQUEUE(wait, current);
631
632
633 if (!event)
634 return -EINVAL;
635
636 if (list_empty(&acpi_bus_event_list)) {
637
638 set_current_state(TASK_INTERRUPTIBLE);
639 add_wait_queue(&acpi_bus_event_queue, &wait);
640
641 if (list_empty(&acpi_bus_event_list))
642 schedule();
643
644 remove_wait_queue(&acpi_bus_event_queue, &wait);
645 set_current_state(TASK_RUNNING);
646
647 if (signal_pending(current))
648 return -ERESTARTSYS;
649 }
650
651 spin_lock_irqsave(&acpi_bus_event_lock, flags);
652 if (!list_empty(&acpi_bus_event_list)) {
653 entry = list_entry(acpi_bus_event_list.next,
654 struct acpi_bus_event, node);
655 list_del(&entry->node);
656 }
657 spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
658
659 if (!entry)
660 return -ENODEV;
661
662 memcpy(event, entry, sizeof(struct acpi_bus_event));
663
664 kfree(entry);
665
666 return 0;
667 }
668
669 #endif /* CONFIG_ACPI_PROC_EVENT */
670
671 /* --------------------------------------------------------------------------
672 Notification Handling
673 -------------------------------------------------------------------------- */
674
acpi_bus_check_device(acpi_handle handle)675 static void acpi_bus_check_device(acpi_handle handle)
676 {
677 struct acpi_device *device;
678 acpi_status status;
679 struct acpi_device_status old_status;
680
681 if (acpi_bus_get_device(handle, &device))
682 return;
683 if (!device)
684 return;
685
686 old_status = device->status;
687
688 /*
689 * Make sure this device's parent is present before we go about
690 * messing with the device.
691 */
692 if (device->parent && !device->parent->status.present) {
693 device->status = device->parent->status;
694 return;
695 }
696
697 status = acpi_bus_get_status(device);
698 if (ACPI_FAILURE(status))
699 return;
700
701 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
702 return;
703
704 /*
705 * Device Insertion/Removal
706 */
707 if ((device->status.present) && !(old_status.present)) {
708 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
709 /* TBD: Handle device insertion */
710 } else if (!(device->status.present) && (old_status.present)) {
711 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
712 /* TBD: Handle device removal */
713 }
714 }
715
acpi_bus_check_scope(acpi_handle handle)716 static void acpi_bus_check_scope(acpi_handle handle)
717 {
718 /* Status Change? */
719 acpi_bus_check_device(handle);
720
721 /*
722 * TBD: Enumerate child devices within this device's scope and
723 * run acpi_bus_check_device()'s on them.
724 */
725 }
726
727 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
register_acpi_bus_notifier(struct notifier_block * nb)728 int register_acpi_bus_notifier(struct notifier_block *nb)
729 {
730 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
731 }
732 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
733
unregister_acpi_bus_notifier(struct notifier_block * nb)734 void unregister_acpi_bus_notifier(struct notifier_block *nb)
735 {
736 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
737 }
738 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
739
740 /**
741 * acpi_bus_notify
742 * ---------------
743 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
744 */
acpi_bus_notify(acpi_handle handle,u32 type,void * data)745 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
746 {
747 struct acpi_device *device = NULL;
748 struct acpi_driver *driver;
749
750 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
751 type, handle));
752
753 blocking_notifier_call_chain(&acpi_bus_notify_list,
754 type, (void *)handle);
755
756 switch (type) {
757
758 case ACPI_NOTIFY_BUS_CHECK:
759 acpi_bus_check_scope(handle);
760 /*
761 * TBD: We'll need to outsource certain events to non-ACPI
762 * drivers via the device manager (device.c).
763 */
764 break;
765
766 case ACPI_NOTIFY_DEVICE_CHECK:
767 acpi_bus_check_device(handle);
768 /*
769 * TBD: We'll need to outsource certain events to non-ACPI
770 * drivers via the device manager (device.c).
771 */
772 break;
773
774 case ACPI_NOTIFY_DEVICE_WAKE:
775 /* TBD */
776 break;
777
778 case ACPI_NOTIFY_EJECT_REQUEST:
779 /* TBD */
780 break;
781
782 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
783 /* TBD: Exactly what does 'light' mean? */
784 break;
785
786 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
787 /* TBD */
788 break;
789
790 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
791 /* TBD */
792 break;
793
794 case ACPI_NOTIFY_POWER_FAULT:
795 /* TBD */
796 break;
797
798 default:
799 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
800 "Received unknown/unsupported notification [%08x]\n",
801 type));
802 break;
803 }
804
805 acpi_bus_get_device(handle, &device);
806 if (device) {
807 driver = device->driver;
808 if (driver && driver->ops.notify &&
809 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
810 driver->ops.notify(device, type);
811 }
812 }
813
814 /* --------------------------------------------------------------------------
815 Initialization/Cleanup
816 -------------------------------------------------------------------------- */
817
acpi_bus_init_irq(void)818 static int __init acpi_bus_init_irq(void)
819 {
820 acpi_status status = AE_OK;
821 union acpi_object arg = { ACPI_TYPE_INTEGER };
822 struct acpi_object_list arg_list = { 1, &arg };
823 char *message = NULL;
824
825
826 /*
827 * Let the system know what interrupt model we are using by
828 * evaluating the \_PIC object, if exists.
829 */
830
831 switch (acpi_irq_model) {
832 case ACPI_IRQ_MODEL_PIC:
833 message = "PIC";
834 break;
835 case ACPI_IRQ_MODEL_IOAPIC:
836 message = "IOAPIC";
837 break;
838 case ACPI_IRQ_MODEL_IOSAPIC:
839 message = "IOSAPIC";
840 break;
841 case ACPI_IRQ_MODEL_PLATFORM:
842 message = "platform specific model";
843 break;
844 default:
845 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
846 return -ENODEV;
847 }
848
849 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
850
851 arg.integer.value = acpi_irq_model;
852
853 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
854 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
855 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
856 return -ENODEV;
857 }
858
859 return 0;
860 }
861
862 u8 acpi_gbl_permanent_mmap;
863
864
acpi_early_init(void)865 void __init acpi_early_init(void)
866 {
867 acpi_status status = AE_OK;
868
869 if (acpi_disabled)
870 return;
871
872 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
873
874 /* enable workarounds, unless strict ACPI spec. compliance */
875 if (!acpi_strict)
876 acpi_gbl_enable_interpreter_slack = TRUE;
877
878 acpi_gbl_permanent_mmap = 1;
879
880 /*
881 * If the machine falls into the DMI check table,
882 * DSDT will be copied to memory
883 */
884 dmi_check_system(dsdt_dmi_table);
885
886 status = acpi_reallocate_root_table();
887 if (ACPI_FAILURE(status)) {
888 printk(KERN_ERR PREFIX
889 "Unable to reallocate ACPI tables\n");
890 goto error0;
891 }
892
893 status = acpi_initialize_subsystem();
894 if (ACPI_FAILURE(status)) {
895 printk(KERN_ERR PREFIX
896 "Unable to initialize the ACPI Interpreter\n");
897 goto error0;
898 }
899
900 status = acpi_load_tables();
901 if (ACPI_FAILURE(status)) {
902 printk(KERN_ERR PREFIX
903 "Unable to load the System Description Tables\n");
904 goto error0;
905 }
906
907 #ifdef CONFIG_X86
908 if (!acpi_ioapic) {
909 /* compatible (0) means level (3) */
910 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
911 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
912 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
913 }
914 /* Set PIC-mode SCI trigger type */
915 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
916 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
917 } else {
918 /*
919 * now that acpi_gbl_FADT is initialized,
920 * update it with result from INT_SRC_OVR parsing
921 */
922 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
923 }
924 #endif
925
926 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
927 if (ACPI_FAILURE(status)) {
928 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
929 goto error0;
930 }
931
932 /*
933 * If the system is using ACPI then we can be reasonably
934 * confident that any regulators are managed by the firmware
935 * so tell the regulator core it has everything it needs to
936 * know.
937 */
938 regulator_has_full_constraints();
939
940 return;
941
942 error0:
943 disable_acpi();
944 return;
945 }
946
acpi_bus_init(void)947 static int __init acpi_bus_init(void)
948 {
949 int result = 0;
950 acpi_status status = AE_OK;
951 extern acpi_status acpi_os_initialize1(void);
952
953 acpi_os_initialize1();
954
955 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
956 if (ACPI_FAILURE(status)) {
957 printk(KERN_ERR PREFIX
958 "Unable to start the ACPI Interpreter\n");
959 goto error1;
960 }
961
962 /*
963 * ACPI 2.0 requires the EC driver to be loaded and work before
964 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
965 * is called).
966 *
967 * This is accomplished by looking for the ECDT table, and getting
968 * the EC parameters out of that.
969 */
970 status = acpi_ec_ecdt_probe();
971 /* Ignore result. Not having an ECDT is not fatal. */
972
973 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
974 if (ACPI_FAILURE(status)) {
975 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
976 goto error1;
977 }
978
979 /*
980 * _OSC method may exist in module level code,
981 * so it must be run after ACPI_FULL_INITIALIZATION
982 */
983 acpi_bus_osc_support();
984
985 /*
986 * _PDC control method may load dynamic SSDT tables,
987 * and we need to install the table handler before that.
988 */
989 acpi_sysfs_init();
990
991 acpi_early_processor_set_pdc();
992
993 /*
994 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
995 * is necessary to enable it as early as possible.
996 */
997 acpi_boot_ec_enable();
998
999 printk(KERN_INFO PREFIX "Interpreter enabled\n");
1000
1001 /* Initialize sleep structures */
1002 acpi_sleep_init();
1003
1004 /*
1005 * Get the system interrupt model and evaluate \_PIC.
1006 */
1007 result = acpi_bus_init_irq();
1008 if (result)
1009 goto error1;
1010
1011 /*
1012 * Register the for all standard device notifications.
1013 */
1014 status =
1015 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1016 &acpi_bus_notify, NULL);
1017 if (ACPI_FAILURE(status)) {
1018 printk(KERN_ERR PREFIX
1019 "Unable to register for device notifications\n");
1020 goto error1;
1021 }
1022
1023 /*
1024 * Create the top ACPI proc directory
1025 */
1026 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1027
1028 return 0;
1029
1030 /* Mimic structured exception handling */
1031 error1:
1032 acpi_terminate();
1033 return -ENODEV;
1034 }
1035
1036 struct kobject *acpi_kobj;
1037 EXPORT_SYMBOL_GPL(acpi_kobj);
1038
acpi_init(void)1039 static int __init acpi_init(void)
1040 {
1041 int result;
1042
1043 if (acpi_disabled) {
1044 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1045 return -ENODEV;
1046 }
1047
1048 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1049 if (!acpi_kobj) {
1050 printk(KERN_WARNING "%s: kset create error\n", __func__);
1051 acpi_kobj = NULL;
1052 }
1053
1054 init_acpi_device_notify();
1055 result = acpi_bus_init();
1056 if (result) {
1057 disable_acpi();
1058 return result;
1059 }
1060
1061 pci_mmcfg_late_init();
1062 acpi_scan_init();
1063 acpi_ec_init();
1064 acpi_debugfs_init();
1065 acpi_sleep_proc_init();
1066 acpi_wakeup_device_init();
1067 return 0;
1068 }
1069
1070 subsys_initcall(acpi_init);
1071