Revert "ARM: tegra: tegratab: dummy change"
[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         /* For D3cold we should execute _PS3, not _PS4. */
254         if (state == ACPI_STATE_D3_COLD)
255                 object_name[3] = '3';
256
257         /*
258          * Transition Power
259          * ----------------
260          * On transitions to a high-powered state we first apply power (via
261          * power resources) then evalute _PSx.  Conversly for transitions to
262          * a lower-powered state.
263          */
264         if (state < device->power.state) {
265                 if (device->power.flags.power_resources) {
266                         result = acpi_power_transition(device, state);
267                         if (result)
268                                 goto end;
269                 }
270                 if (device->power.states[state].flags.explicit_set) {
271                         status = acpi_evaluate_object(device->handle,
272                                                       object_name, NULL, NULL);
273                         if (ACPI_FAILURE(status)) {
274                                 result = -ENODEV;
275                                 goto end;
276                         }
277                 }
278         } else {
279                 if (device->power.states[state].flags.explicit_set) {
280                         status = acpi_evaluate_object(device->handle,
281                                                       object_name, NULL, NULL);
282                         if (ACPI_FAILURE(status)) {
283                                 result = -ENODEV;
284                                 goto end;
285                         }
286                 }
287                 if (device->power.flags.power_resources) {
288                         result = acpi_power_transition(device, state);
289                         if (result)
290                                 goto end;
291                 }
292         }
293
294       end:
295         if (result)
296                 printk(KERN_WARNING PREFIX
297                               "Device [%s] failed to transition to D%d\n",
298                               device->pnp.bus_id, state);
299         else {
300                 device->power.state = state;
301                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
302                                   "Device [%s] transitioned to D%d\n",
303                                   device->pnp.bus_id, state));
304         }
305
306         return result;
307 }
308
309
310 int acpi_bus_set_power(acpi_handle handle, int state)
311 {
312         struct acpi_device *device;
313         int result;
314
315         result = acpi_bus_get_device(handle, &device);
316         if (result)
317                 return result;
318
319         if (!device->flags.power_manageable) {
320                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
321                                 "Device [%s] is not power manageable\n",
322                                 dev_name(&device->dev)));
323                 return -ENODEV;
324         }
325
326         return __acpi_bus_set_power(device, state);
327 }
328 EXPORT_SYMBOL(acpi_bus_set_power);
329
330
331 int acpi_bus_init_power(struct acpi_device *device)
332 {
333         int state;
334         int result;
335
336         if (!device)
337                 return -EINVAL;
338
339         device->power.state = ACPI_STATE_UNKNOWN;
340
341         result = __acpi_bus_get_power(device, &state);
342         if (result)
343                 return result;
344
345         if (device->power.flags.power_resources)
346                 result = acpi_power_on_resources(device, state);
347
348         if (!result)
349                 device->power.state = state;
350
351         return result;
352 }
353
354
355 int acpi_bus_update_power(acpi_handle handle, int *state_p)
356 {
357         struct acpi_device *device;
358         int state;
359         int result;
360
361         result = acpi_bus_get_device(handle, &device);
362         if (result)
363                 return result;
364
365         result = __acpi_bus_get_power(device, &state);
366         if (result)
367                 return result;
368
369         result = __acpi_bus_set_power(device, state);
370         if (!result && state_p)
371                 *state_p = state;
372
373         return result;
374 }
375 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
376
377
378 bool acpi_bus_power_manageable(acpi_handle handle)
379 {
380         struct acpi_device *device;
381         int result;
382
383         result = acpi_bus_get_device(handle, &device);
384         return result ? false : device->flags.power_manageable;
385 }
386
387 EXPORT_SYMBOL(acpi_bus_power_manageable);
388
389 bool acpi_bus_can_wakeup(acpi_handle handle)
390 {
391         struct acpi_device *device;
392         int result;
393
394         result = acpi_bus_get_device(handle, &device);
395         return result ? false : device->wakeup.flags.valid;
396 }
397
398 EXPORT_SYMBOL(acpi_bus_can_wakeup);
399
400 static void acpi_print_osc_error(acpi_handle handle,
401         struct acpi_osc_context *context, char *error)
402 {
403         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
404         int i;
405
406         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
407                 printk(KERN_DEBUG "%s\n", error);
408         else {
409                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
410                 kfree(buffer.pointer);
411         }
412         printk(KERN_DEBUG"_OSC request data:");
413         for (i = 0; i < context->cap.length; i += sizeof(u32))
414                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
415         printk("\n");
416 }
417
418 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
419 {
420         int i;
421         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
422                 24, 26, 28, 30, 32, 34};
423
424         if (strlen(str) != 36)
425                 return AE_BAD_PARAMETER;
426         for (i = 0; i < 36; i++) {
427                 if (i == 8 || i == 13 || i == 18 || i == 23) {
428                         if (str[i] != '-')
429                                 return AE_BAD_PARAMETER;
430                 } else if (!isxdigit(str[i]))
431                         return AE_BAD_PARAMETER;
432         }
433         for (i = 0; i < 16; i++) {
434                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
435                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
436         }
437         return AE_OK;
438 }
439
440 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
441 {
442         acpi_status status;
443         struct acpi_object_list input;
444         union acpi_object in_params[4];
445         union acpi_object *out_obj;
446         u8 uuid[16];
447         u32 errors;
448         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
449
450         if (!context)
451                 return AE_ERROR;
452         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
453                 return AE_ERROR;
454         context->ret.length = ACPI_ALLOCATE_BUFFER;
455         context->ret.pointer = NULL;
456
457         /* Setting up input parameters */
458         input.count = 4;
459         input.pointer = in_params;
460         in_params[0].type               = ACPI_TYPE_BUFFER;
461         in_params[0].buffer.length      = 16;
462         in_params[0].buffer.pointer     = uuid;
463         in_params[1].type               = ACPI_TYPE_INTEGER;
464         in_params[1].integer.value      = context->rev;
465         in_params[2].type               = ACPI_TYPE_INTEGER;
466         in_params[2].integer.value      = context->cap.length/sizeof(u32);
467         in_params[3].type               = ACPI_TYPE_BUFFER;
468         in_params[3].buffer.length      = context->cap.length;
469         in_params[3].buffer.pointer     = context->cap.pointer;
470
471         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
472         if (ACPI_FAILURE(status))
473                 return status;
474
475         if (!output.length)
476                 return AE_NULL_OBJECT;
477
478         out_obj = output.pointer;
479         if (out_obj->type != ACPI_TYPE_BUFFER
480                 || out_obj->buffer.length != context->cap.length) {
481                 acpi_print_osc_error(handle, context,
482                         "_OSC evaluation returned wrong type");
483                 status = AE_TYPE;
484                 goto out_kfree;
485         }
486         /* Need to ignore the bit0 in result code */
487         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
488         if (errors) {
489                 if (errors & OSC_REQUEST_ERROR)
490                         acpi_print_osc_error(handle, context,
491                                 "_OSC request failed");
492                 if (errors & OSC_INVALID_UUID_ERROR)
493                         acpi_print_osc_error(handle, context,
494                                 "_OSC invalid UUID");
495                 if (errors & OSC_INVALID_REVISION_ERROR)
496                         acpi_print_osc_error(handle, context,
497                                 "_OSC invalid revision");
498                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
499                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
500                             & OSC_QUERY_ENABLE)
501                                 goto out_success;
502                         status = AE_SUPPORT;
503                         goto out_kfree;
504                 }
505                 status = AE_ERROR;
506                 goto out_kfree;
507         }
508 out_success:
509         context->ret.length = out_obj->buffer.length;
510         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
511         if (!context->ret.pointer) {
512                 status =  AE_NO_MEMORY;
513                 goto out_kfree;
514         }
515         memcpy(context->ret.pointer, out_obj->buffer.pointer,
516                 context->ret.length);
517         status =  AE_OK;
518
519 out_kfree:
520         kfree(output.pointer);
521         if (status != AE_OK)
522                 context->ret.pointer = NULL;
523         return status;
524 }
525 EXPORT_SYMBOL(acpi_run_osc);
526
527 bool osc_sb_apei_support_acked;
528 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
529 static void acpi_bus_osc_support(void)
530 {
531         u32 capbuf[2];
532         struct acpi_osc_context context = {
533                 .uuid_str = sb_uuid_str,
534                 .rev = 1,
535                 .cap.length = 8,
536                 .cap.pointer = capbuf,
537         };
538         acpi_handle handle;
539
540         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
541         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
542 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
543                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
544         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
545 #endif
546
547 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
548         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
549 #endif
550
551         if (!ghes_disable)
552                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
553         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
554                 return;
555         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
556                 u32 *capbuf_ret = context.ret.pointer;
557                 if (context.ret.length > OSC_SUPPORT_TYPE)
558                         osc_sb_apei_support_acked =
559                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
560                 kfree(context.ret.pointer);
561         }
562         /* do we need to check other returned cap? Sounds no */
563 }
564
565 /* --------------------------------------------------------------------------
566                                 Event Management
567    -------------------------------------------------------------------------- */
568
569 #ifdef CONFIG_ACPI_PROC_EVENT
570 static DEFINE_SPINLOCK(acpi_bus_event_lock);
571
572 LIST_HEAD(acpi_bus_event_list);
573 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
574
575 extern int event_is_open;
576
577 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
578 {
579         struct acpi_bus_event *event;
580         unsigned long flags = 0;
581
582         /* drop event on the floor if no one's listening */
583         if (!event_is_open)
584                 return 0;
585
586         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
587         if (!event)
588                 return -ENOMEM;
589
590         strcpy(event->device_class, device_class);
591         strcpy(event->bus_id, bus_id);
592         event->type = type;
593         event->data = data;
594
595         spin_lock_irqsave(&acpi_bus_event_lock, flags);
596         list_add_tail(&event->node, &acpi_bus_event_list);
597         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
598
599         wake_up_interruptible(&acpi_bus_event_queue);
600
601         return 0;
602
603 }
604
605 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
606
607 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
608 {
609         if (!device)
610                 return -EINVAL;
611         return acpi_bus_generate_proc_event4(device->pnp.device_class,
612                                              device->pnp.bus_id, type, data);
613 }
614
615 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
616
617 int acpi_bus_receive_event(struct acpi_bus_event *event)
618 {
619         unsigned long flags = 0;
620         struct acpi_bus_event *entry = NULL;
621
622         DECLARE_WAITQUEUE(wait, current);
623
624
625         if (!event)
626                 return -EINVAL;
627
628         if (list_empty(&acpi_bus_event_list)) {
629
630                 set_current_state(TASK_INTERRUPTIBLE);
631                 add_wait_queue(&acpi_bus_event_queue, &wait);
632
633                 if (list_empty(&acpi_bus_event_list))
634                         schedule();
635
636                 remove_wait_queue(&acpi_bus_event_queue, &wait);
637                 set_current_state(TASK_RUNNING);
638
639                 if (signal_pending(current))
640                         return -ERESTARTSYS;
641         }
642
643         spin_lock_irqsave(&acpi_bus_event_lock, flags);
644         if (!list_empty(&acpi_bus_event_list)) {
645                 entry = list_entry(acpi_bus_event_list.next,
646                                    struct acpi_bus_event, node);
647                 list_del(&entry->node);
648         }
649         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
650
651         if (!entry)
652                 return -ENODEV;
653
654         memcpy(event, entry, sizeof(struct acpi_bus_event));
655
656         kfree(entry);
657
658         return 0;
659 }
660
661 #endif  /* CONFIG_ACPI_PROC_EVENT */
662
663 /* --------------------------------------------------------------------------
664                              Notification Handling
665    -------------------------------------------------------------------------- */
666
667 static void acpi_bus_check_device(acpi_handle handle)
668 {
669         struct acpi_device *device;
670         acpi_status status;
671         struct acpi_device_status old_status;
672
673         if (acpi_bus_get_device(handle, &device))
674                 return;
675         if (!device)
676                 return;
677
678         old_status = device->status;
679
680         /*
681          * Make sure this device's parent is present before we go about
682          * messing with the device.
683          */
684         if (device->parent && !device->parent->status.present) {
685                 device->status = device->parent->status;
686                 return;
687         }
688
689         status = acpi_bus_get_status(device);
690         if (ACPI_FAILURE(status))
691                 return;
692
693         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
694                 return;
695
696         /*
697          * Device Insertion/Removal
698          */
699         if ((device->status.present) && !(old_status.present)) {
700                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
701                 /* TBD: Handle device insertion */
702         } else if (!(device->status.present) && (old_status.present)) {
703                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
704                 /* TBD: Handle device removal */
705         }
706 }
707
708 static void acpi_bus_check_scope(acpi_handle handle)
709 {
710         /* Status Change? */
711         acpi_bus_check_device(handle);
712
713         /*
714          * TBD: Enumerate child devices within this device's scope and
715          *       run acpi_bus_check_device()'s on them.
716          */
717 }
718
719 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
720 int register_acpi_bus_notifier(struct notifier_block *nb)
721 {
722         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
723 }
724 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
725
726 void unregister_acpi_bus_notifier(struct notifier_block *nb)
727 {
728         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
729 }
730 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
731
732 /**
733  * acpi_bus_notify
734  * ---------------
735  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
736  */
737 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
738 {
739         struct acpi_device *device = NULL;
740         struct acpi_driver *driver;
741
742         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
743                           type, handle));
744
745         blocking_notifier_call_chain(&acpi_bus_notify_list,
746                 type, (void *)handle);
747
748         switch (type) {
749
750         case ACPI_NOTIFY_BUS_CHECK:
751                 acpi_bus_check_scope(handle);
752                 /*
753                  * TBD: We'll need to outsource certain events to non-ACPI
754                  *      drivers via the device manager (device.c).
755                  */
756                 break;
757
758         case ACPI_NOTIFY_DEVICE_CHECK:
759                 acpi_bus_check_device(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_WAKE:
767                 /* TBD */
768                 break;
769
770         case ACPI_NOTIFY_EJECT_REQUEST:
771                 /* TBD */
772                 break;
773
774         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
775                 /* TBD: Exactly what does 'light' mean? */
776                 break;
777
778         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
779                 /* TBD */
780                 break;
781
782         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
783                 /* TBD */
784                 break;
785
786         case ACPI_NOTIFY_POWER_FAULT:
787                 /* TBD */
788                 break;
789
790         default:
791                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
792                                   "Received unknown/unsupported notification [%08x]\n",
793                                   type));
794                 break;
795         }
796
797         acpi_bus_get_device(handle, &device);
798         if (device) {
799                 driver = device->driver;
800                 if (driver && driver->ops.notify &&
801                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
802                         driver->ops.notify(device, type);
803         }
804 }
805
806 /* --------------------------------------------------------------------------
807                              Initialization/Cleanup
808    -------------------------------------------------------------------------- */
809
810 static int __init acpi_bus_init_irq(void)
811 {
812         acpi_status status = AE_OK;
813         union acpi_object arg = { ACPI_TYPE_INTEGER };
814         struct acpi_object_list arg_list = { 1, &arg };
815         char *message = NULL;
816
817
818         /*
819          * Let the system know what interrupt model we are using by
820          * evaluating the \_PIC object, if exists.
821          */
822
823         switch (acpi_irq_model) {
824         case ACPI_IRQ_MODEL_PIC:
825                 message = "PIC";
826                 break;
827         case ACPI_IRQ_MODEL_IOAPIC:
828                 message = "IOAPIC";
829                 break;
830         case ACPI_IRQ_MODEL_IOSAPIC:
831                 message = "IOSAPIC";
832                 break;
833         case ACPI_IRQ_MODEL_PLATFORM:
834                 message = "platform specific model";
835                 break;
836         default:
837                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
838                 return -ENODEV;
839         }
840
841         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
842
843         arg.integer.value = acpi_irq_model;
844
845         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
846         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
847                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
848                 return -ENODEV;
849         }
850
851         return 0;
852 }
853
854 u8 acpi_gbl_permanent_mmap;
855
856
857 void __init acpi_early_init(void)
858 {
859         acpi_status status = AE_OK;
860
861         if (acpi_disabled)
862                 return;
863
864         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
865
866         /* enable workarounds, unless strict ACPI spec. compliance */
867         if (!acpi_strict)
868                 acpi_gbl_enable_interpreter_slack = TRUE;
869
870         acpi_gbl_permanent_mmap = 1;
871
872         /*
873          * If the machine falls into the DMI check table,
874          * DSDT will be copied to memory
875          */
876         dmi_check_system(dsdt_dmi_table);
877
878         status = acpi_reallocate_root_table();
879         if (ACPI_FAILURE(status)) {
880                 printk(KERN_ERR PREFIX
881                        "Unable to reallocate ACPI tables\n");
882                 goto error0;
883         }
884
885         status = acpi_initialize_subsystem();
886         if (ACPI_FAILURE(status)) {
887                 printk(KERN_ERR PREFIX
888                        "Unable to initialize the ACPI Interpreter\n");
889                 goto error0;
890         }
891
892         status = acpi_load_tables();
893         if (ACPI_FAILURE(status)) {
894                 printk(KERN_ERR PREFIX
895                        "Unable to load the System Description Tables\n");
896                 goto error0;
897         }
898
899 #ifdef CONFIG_X86
900         if (!acpi_ioapic) {
901                 /* compatible (0) means level (3) */
902                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
903                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
904                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
905                 }
906                 /* Set PIC-mode SCI trigger type */
907                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
908                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
909         } else {
910                 /*
911                  * now that acpi_gbl_FADT is initialized,
912                  * update it with result from INT_SRC_OVR parsing
913                  */
914                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
915         }
916 #endif
917
918         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
919         if (ACPI_FAILURE(status)) {
920                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
921                 goto error0;
922         }
923
924         return;
925
926       error0:
927         disable_acpi();
928         return;
929 }
930
931 static int __init acpi_bus_init(void)
932 {
933         int result = 0;
934         acpi_status status = AE_OK;
935         extern acpi_status acpi_os_initialize1(void);
936
937         acpi_os_initialize1();
938
939         status = acpi_enable_subsystem(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         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
958         if (ACPI_FAILURE(status)) {
959                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
960                 goto error1;
961         }
962
963         /*
964          * _OSC method may exist in module level code,
965          * so it must be run after ACPI_FULL_INITIALIZATION
966          */
967         acpi_bus_osc_support();
968
969         /*
970          * _PDC control method may load dynamic SSDT tables,
971          * and we need to install the table handler before that.
972          */
973         acpi_sysfs_init();
974
975         acpi_early_processor_set_pdc();
976
977         /*
978          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
979          * is necessary to enable it as early as possible.
980          */
981         acpi_boot_ec_enable();
982
983         printk(KERN_INFO PREFIX "Interpreter enabled\n");
984
985         /* Initialize sleep structures */
986         acpi_sleep_init();
987
988         /*
989          * Get the system interrupt model and evaluate \_PIC.
990          */
991         result = acpi_bus_init_irq();
992         if (result)
993                 goto error1;
994
995         /*
996          * Register the for all standard device notifications.
997          */
998         status =
999             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1000                                         &acpi_bus_notify, NULL);
1001         if (ACPI_FAILURE(status)) {
1002                 printk(KERN_ERR PREFIX
1003                        "Unable to register for device notifications\n");
1004                 goto error1;
1005         }
1006
1007         /*
1008          * Create the top ACPI proc directory
1009          */
1010         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1011
1012         return 0;
1013
1014         /* Mimic structured exception handling */
1015       error1:
1016         acpi_terminate();
1017         return -ENODEV;
1018 }
1019
1020 struct kobject *acpi_kobj;
1021 EXPORT_SYMBOL_GPL(acpi_kobj);
1022
1023 static int __init acpi_init(void)
1024 {
1025         int result;
1026
1027         if (acpi_disabled) {
1028                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1029                 return -ENODEV;
1030         }
1031
1032         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1033         if (!acpi_kobj) {
1034                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1035                 acpi_kobj = NULL;
1036         }
1037
1038         init_acpi_device_notify();
1039         result = acpi_bus_init();
1040         if (result) {
1041                 disable_acpi();
1042                 return result;
1043         }
1044
1045         pci_mmcfg_late_init();
1046         acpi_scan_init();
1047         acpi_ec_init();
1048         acpi_debugfs_init();
1049         acpi_sleep_proc_init();
1050         acpi_wakeup_device_init();
1051         return 0;
1052 }
1053
1054 subsys_initcall(acpi_init);