Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6.git] / drivers / acpi / bus.c
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
49 ACPI_MODULE_NAME("bus");
50
51 struct acpi_device *acpi_root;
52 struct proc_dir_entry *acpi_root_dir;
53 EXPORT_SYMBOL(acpi_root_dir);
54
55 #define STRUCT_TO_INT(s)        (*((int*)&s))
56
57
58 #ifdef CONFIG_X86
59 static 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
67 static 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
83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
84         {}
85 };
86 #endif
87
88 /* --------------------------------------------------------------------------
89                                 Device Management
90    -------------------------------------------------------------------------- */
91
92 int 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
112 EXPORT_SYMBOL(acpi_bus_get_device);
113
114 acpi_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
131 int 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 }
154 EXPORT_SYMBOL(acpi_bus_get_status);
155
156 void acpi_bus_private_data_handler(acpi_handle handle,
157                                    void *context)
158 {
159         return;
160 }
161 EXPORT_SYMBOL(acpi_bus_private_data_handler);
162
163 int 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 }
179 EXPORT_SYMBOL(acpi_bus_get_private_data);
180
181 /* --------------------------------------------------------------------------
182                                  Power Management
183    -------------------------------------------------------------------------- */
184
185 static 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
225 static 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
306 int 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 }
324 EXPORT_SYMBOL(acpi_bus_set_power);
325
326
327 int 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
351 int 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 }
371 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
372
373
374 bool 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
383 EXPORT_SYMBOL(acpi_bus_power_manageable);
384
385 bool 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
394 EXPORT_SYMBOL(acpi_bus_can_wakeup);
395
396 static 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
414 static 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
436 acpi_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         }
504 out_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
515 out_kfree:
516         kfree(output.pointer);
517         if (status != AE_OK)
518                 context->ret.pointer = NULL;
519         return status;
520 }
521 EXPORT_SYMBOL(acpi_run_osc);
522
523 bool osc_sb_apei_support_acked;
524 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
525 static 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
566 static DEFINE_SPINLOCK(acpi_bus_event_lock);
567
568 LIST_HEAD(acpi_bus_event_list);
569 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
570
571 extern int event_is_open;
572
573 int 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
601 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
602
603 int 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
611 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
612
613 int 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
663 static 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
704 static 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
715 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
716 int register_acpi_bus_notifier(struct notifier_block *nb)
717 {
718         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
719 }
720 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
721
722 void unregister_acpi_bus_notifier(struct notifier_block *nb)
723 {
724         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
725 }
726 EXPORT_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  */
733 static 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
806 static 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
850 u8 acpi_gbl_permanent_mmap;
851
852
853 void __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
930 static 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
1016 struct kobject *acpi_kobj;
1017
1018 static 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
1049 subsys_initcall(acpi_init);