Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[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 <linux/dmi.h>
43 #include <linux/suspend.h>
44
45 #include "internal.h"
46
47 #define _COMPONENT              ACPI_BUS_COMPONENT
48 ACPI_MODULE_NAME("bus");
49
50 struct acpi_device *acpi_root;
51 struct proc_dir_entry *acpi_root_dir;
52 EXPORT_SYMBOL(acpi_root_dir);
53
54 #define STRUCT_TO_INT(s)        (*((int*)&s))
55
56
57 #ifdef CONFIG_X86
58 static int set_copy_dsdt(const struct dmi_system_id *id)
59 {
60         printk(KERN_NOTICE "%s detected - "
61                 "force copy of DSDT to local memory\n", id->ident);
62         acpi_gbl_copy_dsdt_locally = 1;
63         return 0;
64 }
65
66 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
67         /*
68          * Invoke DSDT corruption work-around on all Toshiba Satellite.
69          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
70          */
71         {
72          .callback = set_copy_dsdt,
73          .ident = "TOSHIBA Satellite",
74          .matches = {
75                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
76                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
77                 },
78         },
79         {}
80 };
81 #else
82 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
83         {}
84 };
85 #endif
86
87 /* --------------------------------------------------------------------------
88                                 Device Management
89    -------------------------------------------------------------------------- */
90
91 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
92 {
93         acpi_status status = AE_OK;
94
95
96         if (!device)
97                 return -EINVAL;
98
99         /* TBD: Support fixed-feature devices */
100
101         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
102         if (ACPI_FAILURE(status) || !*device) {
103                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
104                                   handle));
105                 return -ENODEV;
106         }
107
108         return 0;
109 }
110
111 EXPORT_SYMBOL(acpi_bus_get_device);
112
113 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
114                                        unsigned long long *sta)
115 {
116         acpi_status status;
117
118         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
119         if (ACPI_SUCCESS(status))
120                 return AE_OK;
121
122         if (status == AE_NOT_FOUND) {
123                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
124                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
125                 return AE_OK;
126         }
127         return status;
128 }
129
130 int acpi_bus_get_status(struct acpi_device *device)
131 {
132         acpi_status status;
133         unsigned long long sta;
134
135         status = acpi_bus_get_status_handle(device->handle, &sta);
136         if (ACPI_FAILURE(status))
137                 return -ENODEV;
138
139         STRUCT_TO_INT(device->status) = (int) sta;
140
141         if (device->status.functional && !device->status.present) {
142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
143                        "functional but not present;\n",
144                         device->pnp.bus_id,
145                         (u32) STRUCT_TO_INT(device->status)));
146         }
147
148         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
149                           device->pnp.bus_id,
150                           (u32) STRUCT_TO_INT(device->status)));
151         return 0;
152 }
153 EXPORT_SYMBOL(acpi_bus_get_status);
154
155 void acpi_bus_private_data_handler(acpi_handle handle,
156                                    void *context)
157 {
158         return;
159 }
160 EXPORT_SYMBOL(acpi_bus_private_data_handler);
161
162 int acpi_bus_get_private_data(acpi_handle handle, void **data)
163 {
164         acpi_status status = AE_OK;
165
166         if (!*data)
167                 return -EINVAL;
168
169         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
170         if (ACPI_FAILURE(status) || !*data) {
171                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
172                                 handle));
173                 return -ENODEV;
174         }
175
176         return 0;
177 }
178 EXPORT_SYMBOL(acpi_bus_get_private_data);
179
180 /* --------------------------------------------------------------------------
181                                  Power Management
182    -------------------------------------------------------------------------- */
183
184 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
185 {
186         int result = 0;
187         acpi_status status = 0;
188         unsigned long long psc = 0;
189
190         if (!device || !state)
191                 return -EINVAL;
192
193         *state = ACPI_STATE_UNKNOWN;
194
195         if (device->flags.power_manageable) {
196                 /*
197                  * Get the device's power state either directly (via _PSC) or
198                  * indirectly (via power resources).
199                  */
200                 if (device->power.flags.power_resources) {
201                         result = acpi_power_get_inferred_state(device, state);
202                         if (result)
203                                 return result;
204                 } else if (device->power.flags.explicit_get) {
205                         status = acpi_evaluate_integer(device->handle, "_PSC",
206                                                        NULL, &psc);
207                         if (ACPI_FAILURE(status))
208                                 return -ENODEV;
209                         *state = (int)psc;
210                 }
211         } else {
212                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
213                 *state = device->parent ?
214                         device->parent->power.state : ACPI_STATE_D0;
215         }
216
217         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
218                           device->pnp.bus_id, *state));
219
220         return 0;
221 }
222
223
224 static int __acpi_bus_set_power(struct acpi_device *device, int state)
225 {
226         int result = 0;
227         acpi_status status = AE_OK;
228         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
229
230         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
231                 return -EINVAL;
232
233         /* Make sure this is a valid target state */
234
235         if (state == device->power.state) {
236                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
237                                   state));
238                 return 0;
239         }
240
241         if (!device->power.states[state].flags.valid) {
242                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
243                 return -ENODEV;
244         }
245         if (device->parent && (state < device->parent->power.state)) {
246                 printk(KERN_WARNING PREFIX
247                               "Cannot set device to a higher-powered"
248                               " state than parent\n");
249                 return -ENODEV;
250         }
251
252         /*
253          * Transition Power
254          * ----------------
255          * On transitions to a high-powered state we first apply power (via
256          * power resources) then evalute _PSx.  Conversly for transitions to
257          * a lower-powered state.
258          */
259         if (state < device->power.state) {
260                 if (device->power.flags.power_resources) {
261                         result = acpi_power_transition(device, state);
262                         if (result)
263                                 goto end;
264                 }
265                 if (device->power.states[state].flags.explicit_set) {
266                         status = acpi_evaluate_object(device->handle,
267                                                       object_name, NULL, NULL);
268                         if (ACPI_FAILURE(status)) {
269                                 result = -ENODEV;
270                                 goto end;
271                         }
272                 }
273         } else {
274                 if (device->power.states[state].flags.explicit_set) {
275                         status = acpi_evaluate_object(device->handle,
276                                                       object_name, NULL, NULL);
277                         if (ACPI_FAILURE(status)) {
278                                 result = -ENODEV;
279                                 goto end;
280                         }
281                 }
282                 if (device->power.flags.power_resources) {
283                         result = acpi_power_transition(device, state);
284                         if (result)
285                                 goto end;
286                 }
287         }
288
289       end:
290         if (result)
291                 printk(KERN_WARNING PREFIX
292                               "Device [%s] failed to transition to D%d\n",
293                               device->pnp.bus_id, state);
294         else {
295                 device->power.state = state;
296                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
297                                   "Device [%s] transitioned to D%d\n",
298                                   device->pnp.bus_id, state));
299         }
300
301         return result;
302 }
303
304
305 int acpi_bus_set_power(acpi_handle handle, int state)
306 {
307         struct acpi_device *device;
308         int result;
309
310         result = acpi_bus_get_device(handle, &device);
311         if (result)
312                 return result;
313
314         if (!device->flags.power_manageable) {
315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316                                 "Device [%s] is not power manageable\n",
317                                 dev_name(&device->dev)));
318                 return -ENODEV;
319         }
320
321         return __acpi_bus_set_power(device, state);
322 }
323 EXPORT_SYMBOL(acpi_bus_set_power);
324
325
326 int acpi_bus_init_power(struct acpi_device *device)
327 {
328         int state;
329         int result;
330
331         if (!device)
332                 return -EINVAL;
333
334         device->power.state = ACPI_STATE_UNKNOWN;
335
336         result = __acpi_bus_get_power(device, &state);
337         if (result)
338                 return result;
339
340         if (device->power.flags.power_resources)
341                 result = acpi_power_on_resources(device, state);
342
343         if (!result)
344                 device->power.state = state;
345
346         return result;
347 }
348
349
350 int acpi_bus_update_power(acpi_handle handle, int *state_p)
351 {
352         struct acpi_device *device;
353         int state;
354         int result;
355
356         result = acpi_bus_get_device(handle, &device);
357         if (result)
358                 return result;
359
360         result = __acpi_bus_get_power(device, &state);
361         if (result)
362                 return result;
363
364         result = __acpi_bus_set_power(device, state);
365         if (!result && state_p)
366                 *state_p = state;
367
368         return result;
369 }
370 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
371
372
373 bool acpi_bus_power_manageable(acpi_handle handle)
374 {
375         struct acpi_device *device;
376         int result;
377
378         result = acpi_bus_get_device(handle, &device);
379         return result ? false : device->flags.power_manageable;
380 }
381
382 EXPORT_SYMBOL(acpi_bus_power_manageable);
383
384 bool acpi_bus_can_wakeup(acpi_handle handle)
385 {
386         struct acpi_device *device;
387         int result;
388
389         result = acpi_bus_get_device(handle, &device);
390         return result ? false : device->wakeup.flags.valid;
391 }
392
393 EXPORT_SYMBOL(acpi_bus_can_wakeup);
394
395 static void acpi_print_osc_error(acpi_handle handle,
396         struct acpi_osc_context *context, char *error)
397 {
398         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
399         int i;
400
401         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
402                 printk(KERN_DEBUG "%s\n", error);
403         else {
404                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
405                 kfree(buffer.pointer);
406         }
407         printk(KERN_DEBUG"_OSC request data:");
408         for (i = 0; i < context->cap.length; i += sizeof(u32))
409                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
410         printk("\n");
411 }
412
413 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
414 {
415         int i;
416         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
417                 24, 26, 28, 30, 32, 34};
418
419         if (strlen(str) != 36)
420                 return AE_BAD_PARAMETER;
421         for (i = 0; i < 36; i++) {
422                 if (i == 8 || i == 13 || i == 18 || i == 23) {
423                         if (str[i] != '-')
424                                 return AE_BAD_PARAMETER;
425                 } else if (!isxdigit(str[i]))
426                         return AE_BAD_PARAMETER;
427         }
428         for (i = 0; i < 16; i++) {
429                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
430                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
431         }
432         return AE_OK;
433 }
434
435 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
436 {
437         acpi_status status;
438         struct acpi_object_list input;
439         union acpi_object in_params[4];
440         union acpi_object *out_obj;
441         u8 uuid[16];
442         u32 errors;
443         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
444
445         if (!context)
446                 return AE_ERROR;
447         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
448                 return AE_ERROR;
449         context->ret.length = ACPI_ALLOCATE_BUFFER;
450         context->ret.pointer = NULL;
451
452         /* Setting up input parameters */
453         input.count = 4;
454         input.pointer = in_params;
455         in_params[0].type               = ACPI_TYPE_BUFFER;
456         in_params[0].buffer.length      = 16;
457         in_params[0].buffer.pointer     = uuid;
458         in_params[1].type               = ACPI_TYPE_INTEGER;
459         in_params[1].integer.value      = context->rev;
460         in_params[2].type               = ACPI_TYPE_INTEGER;
461         in_params[2].integer.value      = context->cap.length/sizeof(u32);
462         in_params[3].type               = ACPI_TYPE_BUFFER;
463         in_params[3].buffer.length      = context->cap.length;
464         in_params[3].buffer.pointer     = context->cap.pointer;
465
466         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
467         if (ACPI_FAILURE(status))
468                 return status;
469
470         if (!output.length)
471                 return AE_NULL_OBJECT;
472
473         out_obj = output.pointer;
474         if (out_obj->type != ACPI_TYPE_BUFFER
475                 || out_obj->buffer.length != context->cap.length) {
476                 acpi_print_osc_error(handle, context,
477                         "_OSC evaluation returned wrong type");
478                 status = AE_TYPE;
479                 goto out_kfree;
480         }
481         /* Need to ignore the bit0 in result code */
482         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
483         if (errors) {
484                 if (errors & OSC_REQUEST_ERROR)
485                         acpi_print_osc_error(handle, context,
486                                 "_OSC request failed");
487                 if (errors & OSC_INVALID_UUID_ERROR)
488                         acpi_print_osc_error(handle, context,
489                                 "_OSC invalid UUID");
490                 if (errors & OSC_INVALID_REVISION_ERROR)
491                         acpi_print_osc_error(handle, context,
492                                 "_OSC invalid revision");
493                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
494                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
495                             & OSC_QUERY_ENABLE)
496                                 goto out_success;
497                         status = AE_SUPPORT;
498                         goto out_kfree;
499                 }
500                 status = AE_ERROR;
501                 goto out_kfree;
502         }
503 out_success:
504         context->ret.length = out_obj->buffer.length;
505         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
506         if (!context->ret.pointer) {
507                 status =  AE_NO_MEMORY;
508                 goto out_kfree;
509         }
510         memcpy(context->ret.pointer, out_obj->buffer.pointer,
511                 context->ret.length);
512         status =  AE_OK;
513
514 out_kfree:
515         kfree(output.pointer);
516         if (status != AE_OK)
517                 context->ret.pointer = NULL;
518         return status;
519 }
520 EXPORT_SYMBOL(acpi_run_osc);
521
522 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
523 static void acpi_bus_osc_support(void)
524 {
525         u32 capbuf[2];
526         struct acpi_osc_context context = {
527                 .uuid_str = sb_uuid_str,
528                 .rev = 1,
529                 .cap.length = 8,
530                 .cap.pointer = capbuf,
531         };
532         acpi_handle handle;
533
534         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
535         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
536 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
537                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
538         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
539 #endif
540
541 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
542         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
543 #endif
544         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
545                 return;
546         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
547                 kfree(context.ret.pointer);
548         /* do we need to check the returned cap? Sounds no */
549 }
550
551 /* --------------------------------------------------------------------------
552                                 Event Management
553    -------------------------------------------------------------------------- */
554
555 #ifdef CONFIG_ACPI_PROC_EVENT
556 static DEFINE_SPINLOCK(acpi_bus_event_lock);
557
558 LIST_HEAD(acpi_bus_event_list);
559 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
560
561 extern int event_is_open;
562
563 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
564 {
565         struct acpi_bus_event *event;
566         unsigned long flags = 0;
567
568         /* drop event on the floor if no one's listening */
569         if (!event_is_open)
570                 return 0;
571
572         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
573         if (!event)
574                 return -ENOMEM;
575
576         strcpy(event->device_class, device_class);
577         strcpy(event->bus_id, bus_id);
578         event->type = type;
579         event->data = data;
580
581         spin_lock_irqsave(&acpi_bus_event_lock, flags);
582         list_add_tail(&event->node, &acpi_bus_event_list);
583         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
584
585         wake_up_interruptible(&acpi_bus_event_queue);
586
587         return 0;
588
589 }
590
591 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
592
593 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
594 {
595         if (!device)
596                 return -EINVAL;
597         return acpi_bus_generate_proc_event4(device->pnp.device_class,
598                                              device->pnp.bus_id, type, data);
599 }
600
601 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
602
603 int acpi_bus_receive_event(struct acpi_bus_event *event)
604 {
605         unsigned long flags = 0;
606         struct acpi_bus_event *entry = NULL;
607
608         DECLARE_WAITQUEUE(wait, current);
609
610
611         if (!event)
612                 return -EINVAL;
613
614         if (list_empty(&acpi_bus_event_list)) {
615
616                 set_current_state(TASK_INTERRUPTIBLE);
617                 add_wait_queue(&acpi_bus_event_queue, &wait);
618
619                 if (list_empty(&acpi_bus_event_list))
620                         schedule();
621
622                 remove_wait_queue(&acpi_bus_event_queue, &wait);
623                 set_current_state(TASK_RUNNING);
624
625                 if (signal_pending(current))
626                         return -ERESTARTSYS;
627         }
628
629         spin_lock_irqsave(&acpi_bus_event_lock, flags);
630         if (!list_empty(&acpi_bus_event_list)) {
631                 entry = list_entry(acpi_bus_event_list.next,
632                                    struct acpi_bus_event, node);
633                 list_del(&entry->node);
634         }
635         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
636
637         if (!entry)
638                 return -ENODEV;
639
640         memcpy(event, entry, sizeof(struct acpi_bus_event));
641
642         kfree(entry);
643
644         return 0;
645 }
646
647 #endif  /* CONFIG_ACPI_PROC_EVENT */
648
649 /* --------------------------------------------------------------------------
650                              Notification Handling
651    -------------------------------------------------------------------------- */
652
653 static void acpi_bus_check_device(acpi_handle handle)
654 {
655         struct acpi_device *device;
656         acpi_status status;
657         struct acpi_device_status old_status;
658
659         if (acpi_bus_get_device(handle, &device))
660                 return;
661         if (!device)
662                 return;
663
664         old_status = device->status;
665
666         /*
667          * Make sure this device's parent is present before we go about
668          * messing with the device.
669          */
670         if (device->parent && !device->parent->status.present) {
671                 device->status = device->parent->status;
672                 return;
673         }
674
675         status = acpi_bus_get_status(device);
676         if (ACPI_FAILURE(status))
677                 return;
678
679         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
680                 return;
681
682         /*
683          * Device Insertion/Removal
684          */
685         if ((device->status.present) && !(old_status.present)) {
686                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
687                 /* TBD: Handle device insertion */
688         } else if (!(device->status.present) && (old_status.present)) {
689                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
690                 /* TBD: Handle device removal */
691         }
692 }
693
694 static void acpi_bus_check_scope(acpi_handle handle)
695 {
696         /* Status Change? */
697         acpi_bus_check_device(handle);
698
699         /*
700          * TBD: Enumerate child devices within this device's scope and
701          *       run acpi_bus_check_device()'s on them.
702          */
703 }
704
705 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
706 int register_acpi_bus_notifier(struct notifier_block *nb)
707 {
708         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
709 }
710 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
711
712 void unregister_acpi_bus_notifier(struct notifier_block *nb)
713 {
714         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
715 }
716 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
717
718 /**
719  * acpi_bus_notify
720  * ---------------
721  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
722  */
723 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
724 {
725         struct acpi_device *device = NULL;
726         struct acpi_driver *driver;
727
728         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
729                           type, handle));
730
731         blocking_notifier_call_chain(&acpi_bus_notify_list,
732                 type, (void *)handle);
733
734         switch (type) {
735
736         case ACPI_NOTIFY_BUS_CHECK:
737                 acpi_bus_check_scope(handle);
738                 /*
739                  * TBD: We'll need to outsource certain events to non-ACPI
740                  *      drivers via the device manager (device.c).
741                  */
742                 break;
743
744         case ACPI_NOTIFY_DEVICE_CHECK:
745                 acpi_bus_check_device(handle);
746                 /*
747                  * TBD: We'll need to outsource certain events to non-ACPI
748                  *      drivers via the device manager (device.c).
749                  */
750                 break;
751
752         case ACPI_NOTIFY_DEVICE_WAKE:
753                 /* TBD */
754                 break;
755
756         case ACPI_NOTIFY_EJECT_REQUEST:
757                 /* TBD */
758                 break;
759
760         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
761                 /* TBD: Exactly what does 'light' mean? */
762                 break;
763
764         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
765                 /* TBD */
766                 break;
767
768         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
769                 /* TBD */
770                 break;
771
772         case ACPI_NOTIFY_POWER_FAULT:
773                 /* TBD */
774                 break;
775
776         default:
777                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
778                                   "Received unknown/unsupported notification [%08x]\n",
779                                   type));
780                 break;
781         }
782
783         acpi_bus_get_device(handle, &device);
784         if (device) {
785                 driver = device->driver;
786                 if (driver && driver->ops.notify &&
787                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
788                         driver->ops.notify(device, type);
789         }
790 }
791
792 /* --------------------------------------------------------------------------
793                              Initialization/Cleanup
794    -------------------------------------------------------------------------- */
795
796 static int __init acpi_bus_init_irq(void)
797 {
798         acpi_status status = AE_OK;
799         union acpi_object arg = { ACPI_TYPE_INTEGER };
800         struct acpi_object_list arg_list = { 1, &arg };
801         char *message = NULL;
802
803
804         /*
805          * Let the system know what interrupt model we are using by
806          * evaluating the \_PIC object, if exists.
807          */
808
809         switch (acpi_irq_model) {
810         case ACPI_IRQ_MODEL_PIC:
811                 message = "PIC";
812                 break;
813         case ACPI_IRQ_MODEL_IOAPIC:
814                 message = "IOAPIC";
815                 break;
816         case ACPI_IRQ_MODEL_IOSAPIC:
817                 message = "IOSAPIC";
818                 break;
819         case ACPI_IRQ_MODEL_PLATFORM:
820                 message = "platform specific model";
821                 break;
822         default:
823                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
824                 return -ENODEV;
825         }
826
827         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
828
829         arg.integer.value = acpi_irq_model;
830
831         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
832         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
833                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
834                 return -ENODEV;
835         }
836
837         return 0;
838 }
839
840 u8 acpi_gbl_permanent_mmap;
841
842
843 void __init acpi_early_init(void)
844 {
845         acpi_status status = AE_OK;
846
847         if (acpi_disabled)
848                 return;
849
850         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
851
852         /* enable workarounds, unless strict ACPI spec. compliance */
853         if (!acpi_strict)
854                 acpi_gbl_enable_interpreter_slack = TRUE;
855
856         acpi_gbl_permanent_mmap = 1;
857
858         /*
859          * If the machine falls into the DMI check table,
860          * DSDT will be copied to memory
861          */
862         dmi_check_system(dsdt_dmi_table);
863
864         status = acpi_reallocate_root_table();
865         if (ACPI_FAILURE(status)) {
866                 printk(KERN_ERR PREFIX
867                        "Unable to reallocate ACPI tables\n");
868                 goto error0;
869         }
870
871         status = acpi_initialize_subsystem();
872         if (ACPI_FAILURE(status)) {
873                 printk(KERN_ERR PREFIX
874                        "Unable to initialize the ACPI Interpreter\n");
875                 goto error0;
876         }
877
878         status = acpi_load_tables();
879         if (ACPI_FAILURE(status)) {
880                 printk(KERN_ERR PREFIX
881                        "Unable to load the System Description Tables\n");
882                 goto error0;
883         }
884
885 #ifdef CONFIG_X86
886         if (!acpi_ioapic) {
887                 /* compatible (0) means level (3) */
888                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
889                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
890                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
891                 }
892                 /* Set PIC-mode SCI trigger type */
893                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
894                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
895         } else {
896                 /*
897                  * now that acpi_gbl_FADT is initialized,
898                  * update it with result from INT_SRC_OVR parsing
899                  */
900                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
901         }
902 #endif
903
904         status =
905             acpi_enable_subsystem(~
906                                   (ACPI_NO_HARDWARE_INIT |
907                                    ACPI_NO_ACPI_ENABLE));
908         if (ACPI_FAILURE(status)) {
909                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
910                 goto error0;
911         }
912
913         return;
914
915       error0:
916         disable_acpi();
917         return;
918 }
919
920 static int __init acpi_bus_init(void)
921 {
922         int result = 0;
923         acpi_status status = AE_OK;
924         extern acpi_status acpi_os_initialize1(void);
925
926         acpi_os_initialize1();
927
928         status =
929             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
930         if (ACPI_FAILURE(status)) {
931                 printk(KERN_ERR PREFIX
932                        "Unable to start the ACPI Interpreter\n");
933                 goto error1;
934         }
935
936         /*
937          * ACPI 2.0 requires the EC driver to be loaded and work before
938          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
939          * is called).
940          *
941          * This is accomplished by looking for the ECDT table, and getting
942          * the EC parameters out of that.
943          */
944         status = acpi_ec_ecdt_probe();
945         /* Ignore result. Not having an ECDT is not fatal. */
946
947         acpi_bus_osc_support();
948
949         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
950         if (ACPI_FAILURE(status)) {
951                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
952                 goto error1;
953         }
954
955         /*
956          * _PDC control method may load dynamic SSDT tables,
957          * and we need to install the table handler before that.
958          */
959         acpi_sysfs_init();
960
961         acpi_early_processor_set_pdc();
962
963         /*
964          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
965          * is necessary to enable it as early as possible.
966          */
967         acpi_boot_ec_enable();
968
969         printk(KERN_INFO PREFIX "Interpreter enabled\n");
970
971         /* Initialize sleep structures */
972         acpi_sleep_init();
973
974         /*
975          * Get the system interrupt model and evaluate \_PIC.
976          */
977         result = acpi_bus_init_irq();
978         if (result)
979                 goto error1;
980
981         /*
982          * Register the for all standard device notifications.
983          */
984         status =
985             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
986                                         &acpi_bus_notify, NULL);
987         if (ACPI_FAILURE(status)) {
988                 printk(KERN_ERR PREFIX
989                        "Unable to register for device notifications\n");
990                 goto error1;
991         }
992
993         /*
994          * Create the top ACPI proc directory
995          */
996         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
997
998         return 0;
999
1000         /* Mimic structured exception handling */
1001       error1:
1002         acpi_terminate();
1003         return -ENODEV;
1004 }
1005
1006 struct kobject *acpi_kobj;
1007
1008 static int __init acpi_init(void)
1009 {
1010         int result;
1011
1012         if (acpi_disabled) {
1013                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1014                 return -ENODEV;
1015         }
1016
1017         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1018         if (!acpi_kobj) {
1019                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1020                 acpi_kobj = NULL;
1021         }
1022
1023         init_acpi_device_notify();
1024         result = acpi_bus_init();
1025         if (result) {
1026                 disable_acpi();
1027                 return result;
1028         }
1029
1030         pci_mmcfg_late_init();
1031         acpi_scan_init();
1032         acpi_ec_init();
1033         acpi_debugfs_init();
1034         acpi_sleep_proc_init();
1035         acpi_wakeup_device_init();
1036         return 0;
1037 }
1038
1039 subsys_initcall(acpi_init);