]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/acpi/bus.c
Merge branches 'bugzilla-14446', 'bugzilla-14753' and 'bugzilla-14824' into release
[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 #ifdef CONFIG_X86
36 #include <asm/mpspec.h>
37 #endif
38 #include <linux/pci.h>
39 #include <acpi/acpi_bus.h>
40 #include <acpi/acpi_drivers.h>
41 #include <linux/dmi.h>
42
43 #include "internal.h"
44
45 #define _COMPONENT              ACPI_BUS_COMPONENT
46 ACPI_MODULE_NAME("bus");
47
48 struct acpi_device *acpi_root;
49 struct proc_dir_entry *acpi_root_dir;
50 EXPORT_SYMBOL(acpi_root_dir);
51
52 #define STRUCT_TO_INT(s)        (*((int*)&s))
53
54 static int set_power_nocheck(const struct dmi_system_id *id)
55 {
56         printk(KERN_NOTICE PREFIX "%s detected - "
57                 "disable power check in power transistion\n", id->ident);
58         acpi_power_nocheck = 1;
59         return 0;
60 }
61 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
62         {
63         set_power_nocheck, "HP Pavilion 05", {
64         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
65         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
66         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
67         {},
68 };
69
70
71 /* --------------------------------------------------------------------------
72                                 Device Management
73    -------------------------------------------------------------------------- */
74
75 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
76 {
77         acpi_status status = AE_OK;
78
79
80         if (!device)
81                 return -EINVAL;
82
83         /* TBD: Support fixed-feature devices */
84
85         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
86         if (ACPI_FAILURE(status) || !*device) {
87                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
88                                   handle));
89                 return -ENODEV;
90         }
91
92         return 0;
93 }
94
95 EXPORT_SYMBOL(acpi_bus_get_device);
96
97 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
98                                        unsigned long long *sta)
99 {
100         acpi_status status;
101
102         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
103         if (ACPI_SUCCESS(status))
104                 return AE_OK;
105
106         if (status == AE_NOT_FOUND) {
107                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
108                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
109                 return AE_OK;
110         }
111         return status;
112 }
113
114 int acpi_bus_get_status(struct acpi_device *device)
115 {
116         acpi_status status;
117         unsigned long long sta;
118
119         status = acpi_bus_get_status_handle(device->handle, &sta);
120         if (ACPI_FAILURE(status))
121                 return -ENODEV;
122
123         STRUCT_TO_INT(device->status) = (int) sta;
124
125         if (device->status.functional && !device->status.present) {
126                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
127                        "functional but not present;\n",
128                         device->pnp.bus_id,
129                         (u32) STRUCT_TO_INT(device->status)));
130         }
131
132         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
133                           device->pnp.bus_id,
134                           (u32) STRUCT_TO_INT(device->status)));
135         return 0;
136 }
137 EXPORT_SYMBOL(acpi_bus_get_status);
138
139 void acpi_bus_private_data_handler(acpi_handle handle,
140                                    void *context)
141 {
142         return;
143 }
144 EXPORT_SYMBOL(acpi_bus_private_data_handler);
145
146 int acpi_bus_get_private_data(acpi_handle handle, void **data)
147 {
148         acpi_status status = AE_OK;
149
150         if (!*data)
151                 return -EINVAL;
152
153         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
154         if (ACPI_FAILURE(status) || !*data) {
155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
156                                 handle));
157                 return -ENODEV;
158         }
159
160         return 0;
161 }
162 EXPORT_SYMBOL(acpi_bus_get_private_data);
163
164 /* --------------------------------------------------------------------------
165                                  Power Management
166    -------------------------------------------------------------------------- */
167
168 int acpi_bus_get_power(acpi_handle handle, int *state)
169 {
170         int result = 0;
171         acpi_status status = 0;
172         struct acpi_device *device = NULL;
173         unsigned long long psc = 0;
174
175
176         result = acpi_bus_get_device(handle, &device);
177         if (result)
178                 return result;
179
180         *state = ACPI_STATE_UNKNOWN;
181
182         if (!device->flags.power_manageable) {
183                 /* TBD: Non-recursive algorithm for walking up hierarchy */
184                 if (device->parent)
185                         *state = device->parent->power.state;
186                 else
187                         *state = ACPI_STATE_D0;
188         } else {
189                 /*
190                  * Get the device's power state either directly (via _PSC) or
191                  * indirectly (via power resources).
192                  */
193                 if (device->power.flags.explicit_get) {
194                         status = acpi_evaluate_integer(device->handle, "_PSC",
195                                                        NULL, &psc);
196                         if (ACPI_FAILURE(status))
197                                 return -ENODEV;
198                         device->power.state = (int)psc;
199                 } else if (device->power.flags.power_resources) {
200                         result = acpi_power_get_inferred_state(device);
201                         if (result)
202                                 return result;
203                 }
204
205                 *state = device->power.state;
206         }
207
208         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
209                           device->pnp.bus_id, device->power.state));
210
211         return 0;
212 }
213
214 EXPORT_SYMBOL(acpi_bus_get_power);
215
216 int acpi_bus_set_power(acpi_handle handle, int state)
217 {
218         int result = 0;
219         acpi_status status = AE_OK;
220         struct acpi_device *device = NULL;
221         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
222
223
224         result = acpi_bus_get_device(handle, &device);
225         if (result)
226                 return result;
227
228         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
229                 return -EINVAL;
230
231         /* Make sure this is a valid target state */
232
233         if (!device->flags.power_manageable) {
234                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
235                                 kobject_name(&device->dev.kobj)));
236                 return -ENODEV;
237         }
238         /*
239          * Get device's current power state
240          */
241         if (!acpi_power_nocheck) {
242                 /*
243                  * Maybe the incorrect power state is returned on the bogus
244                  * bios, which is different with the real power state.
245                  * For example: the bios returns D0 state and the real power
246                  * state is D3. OS expects to set the device to D0 state. In
247                  * such case if OS uses the power state returned by the BIOS,
248                  * the device can't be transisted to the correct power state.
249                  * So if the acpi_power_nocheck is set, it is unnecessary to
250                  * get the power state by calling acpi_bus_get_power.
251                  */
252                 acpi_bus_get_power(device->handle, &device->power.state);
253         }
254         if ((state == device->power.state) && !device->flags.force_power_state) {
255                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
256                                   state));
257                 return 0;
258         }
259
260         if (!device->power.states[state].flags.valid) {
261                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
262                 return -ENODEV;
263         }
264         if (device->parent && (state < device->parent->power.state)) {
265                 printk(KERN_WARNING PREFIX
266                               "Cannot set device to a higher-powered"
267                               " state than parent\n");
268                 return -ENODEV;
269         }
270
271         /*
272          * Transition Power
273          * ----------------
274          * On transitions to a high-powered state we first apply power (via
275          * power resources) then evalute _PSx.  Conversly for transitions to
276          * a lower-powered state.
277          */
278         if (state < device->power.state) {
279                 if (device->power.flags.power_resources) {
280                         result = acpi_power_transition(device, state);
281                         if (result)
282                                 goto end;
283                 }
284                 if (device->power.states[state].flags.explicit_set) {
285                         status = acpi_evaluate_object(device->handle,
286                                                       object_name, NULL, NULL);
287                         if (ACPI_FAILURE(status)) {
288                                 result = -ENODEV;
289                                 goto end;
290                         }
291                 }
292         } else {
293                 if (device->power.states[state].flags.explicit_set) {
294                         status = acpi_evaluate_object(device->handle,
295                                                       object_name, NULL, NULL);
296                         if (ACPI_FAILURE(status)) {
297                                 result = -ENODEV;
298                                 goto end;
299                         }
300                 }
301                 if (device->power.flags.power_resources) {
302                         result = acpi_power_transition(device, state);
303                         if (result)
304                                 goto end;
305                 }
306         }
307
308       end:
309         if (result)
310                 printk(KERN_WARNING PREFIX
311                               "Device [%s] failed to transition to D%d\n",
312                               device->pnp.bus_id, state);
313         else {
314                 device->power.state = state;
315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316                                   "Device [%s] transitioned to D%d\n",
317                                   device->pnp.bus_id, state));
318         }
319
320         return result;
321 }
322
323 EXPORT_SYMBOL(acpi_bus_set_power);
324
325 bool acpi_bus_power_manageable(acpi_handle handle)
326 {
327         struct acpi_device *device;
328         int result;
329
330         result = acpi_bus_get_device(handle, &device);
331         return result ? false : device->flags.power_manageable;
332 }
333
334 EXPORT_SYMBOL(acpi_bus_power_manageable);
335
336 bool acpi_bus_can_wakeup(acpi_handle handle)
337 {
338         struct acpi_device *device;
339         int result;
340
341         result = acpi_bus_get_device(handle, &device);
342         return result ? false : device->wakeup.flags.valid;
343 }
344
345 EXPORT_SYMBOL(acpi_bus_can_wakeup);
346
347 static void acpi_print_osc_error(acpi_handle handle,
348         struct acpi_osc_context *context, char *error)
349 {
350         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
351         int i;
352
353         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
354                 printk(KERN_DEBUG "%s\n", error);
355         else {
356                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
357                 kfree(buffer.pointer);
358         }
359         printk(KERN_DEBUG"_OSC request data:");
360         for (i = 0; i < context->cap.length; i += sizeof(u32))
361                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
362         printk("\n");
363 }
364
365 static u8 hex_val(unsigned char c)
366 {
367         return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
368 }
369
370 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
371 {
372         int i;
373         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
374                 24, 26, 28, 30, 32, 34};
375
376         if (strlen(str) != 36)
377                 return AE_BAD_PARAMETER;
378         for (i = 0; i < 36; i++) {
379                 if (i == 8 || i == 13 || i == 18 || i == 23) {
380                         if (str[i] != '-')
381                                 return AE_BAD_PARAMETER;
382                 } else if (!isxdigit(str[i]))
383                         return AE_BAD_PARAMETER;
384         }
385         for (i = 0; i < 16; i++) {
386                 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
387                 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
388         }
389         return AE_OK;
390 }
391
392 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
393 {
394         acpi_status status;
395         struct acpi_object_list input;
396         union acpi_object in_params[4];
397         union acpi_object *out_obj;
398         u8 uuid[16];
399         u32 errors;
400         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
401
402         if (!context)
403                 return AE_ERROR;
404         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
405                 return AE_ERROR;
406         context->ret.length = ACPI_ALLOCATE_BUFFER;
407         context->ret.pointer = NULL;
408
409         /* Setting up input parameters */
410         input.count = 4;
411         input.pointer = in_params;
412         in_params[0].type               = ACPI_TYPE_BUFFER;
413         in_params[0].buffer.length      = 16;
414         in_params[0].buffer.pointer     = uuid;
415         in_params[1].type               = ACPI_TYPE_INTEGER;
416         in_params[1].integer.value      = context->rev;
417         in_params[2].type               = ACPI_TYPE_INTEGER;
418         in_params[2].integer.value      = context->cap.length/sizeof(u32);
419         in_params[3].type               = ACPI_TYPE_BUFFER;
420         in_params[3].buffer.length      = context->cap.length;
421         in_params[3].buffer.pointer     = context->cap.pointer;
422
423         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
424         if (ACPI_FAILURE(status))
425                 return status;
426
427         if (!output.length)
428                 return AE_NULL_OBJECT;
429
430         out_obj = output.pointer;
431         if (out_obj->type != ACPI_TYPE_BUFFER
432                 || out_obj->buffer.length != context->cap.length) {
433                 acpi_print_osc_error(handle, context,
434                         "_OSC evaluation returned wrong type");
435                 status = AE_TYPE;
436                 goto out_kfree;
437         }
438         /* Need to ignore the bit0 in result code */
439         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
440         if (errors) {
441                 if (errors & OSC_REQUEST_ERROR)
442                         acpi_print_osc_error(handle, context,
443                                 "_OSC request failed");
444                 if (errors & OSC_INVALID_UUID_ERROR)
445                         acpi_print_osc_error(handle, context,
446                                 "_OSC invalid UUID");
447                 if (errors & OSC_INVALID_REVISION_ERROR)
448                         acpi_print_osc_error(handle, context,
449                                 "_OSC invalid revision");
450                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
451                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
452                             & OSC_QUERY_ENABLE)
453                                 goto out_success;
454                         status = AE_SUPPORT;
455                         goto out_kfree;
456                 }
457                 status = AE_ERROR;
458                 goto out_kfree;
459         }
460 out_success:
461         context->ret.length = out_obj->buffer.length;
462         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
463         if (!context->ret.pointer) {
464                 status =  AE_NO_MEMORY;
465                 goto out_kfree;
466         }
467         memcpy(context->ret.pointer, out_obj->buffer.pointer,
468                 context->ret.length);
469         status =  AE_OK;
470
471 out_kfree:
472         kfree(output.pointer);
473         if (status != AE_OK)
474                 context->ret.pointer = NULL;
475         return status;
476 }
477 EXPORT_SYMBOL(acpi_run_osc);
478
479 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
480 static void acpi_bus_osc_support(void)
481 {
482         u32 capbuf[2];
483         struct acpi_osc_context context = {
484                 .uuid_str = sb_uuid_str,
485                 .rev = 1,
486                 .cap.length = 8,
487                 .cap.pointer = capbuf,
488         };
489         acpi_handle handle;
490
491         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
492         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
493 #ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR
494         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
495 #endif
496         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
497                 return;
498         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
499                 kfree(context.ret.pointer);
500         /* do we need to check the returned cap? Sounds no */
501 }
502
503 /* --------------------------------------------------------------------------
504                                 Event Management
505    -------------------------------------------------------------------------- */
506
507 #ifdef CONFIG_ACPI_PROC_EVENT
508 static DEFINE_SPINLOCK(acpi_bus_event_lock);
509
510 LIST_HEAD(acpi_bus_event_list);
511 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
512
513 extern int event_is_open;
514
515 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
516 {
517         struct acpi_bus_event *event;
518         unsigned long flags = 0;
519
520         /* drop event on the floor if no one's listening */
521         if (!event_is_open)
522                 return 0;
523
524         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
525         if (!event)
526                 return -ENOMEM;
527
528         strcpy(event->device_class, device_class);
529         strcpy(event->bus_id, bus_id);
530         event->type = type;
531         event->data = data;
532
533         spin_lock_irqsave(&acpi_bus_event_lock, flags);
534         list_add_tail(&event->node, &acpi_bus_event_list);
535         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
536
537         wake_up_interruptible(&acpi_bus_event_queue);
538
539         return 0;
540
541 }
542
543 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
544
545 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
546 {
547         if (!device)
548                 return -EINVAL;
549         return acpi_bus_generate_proc_event4(device->pnp.device_class,
550                                              device->pnp.bus_id, type, data);
551 }
552
553 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
554
555 int acpi_bus_receive_event(struct acpi_bus_event *event)
556 {
557         unsigned long flags = 0;
558         struct acpi_bus_event *entry = NULL;
559
560         DECLARE_WAITQUEUE(wait, current);
561
562
563         if (!event)
564                 return -EINVAL;
565
566         if (list_empty(&acpi_bus_event_list)) {
567
568                 set_current_state(TASK_INTERRUPTIBLE);
569                 add_wait_queue(&acpi_bus_event_queue, &wait);
570
571                 if (list_empty(&acpi_bus_event_list))
572                         schedule();
573
574                 remove_wait_queue(&acpi_bus_event_queue, &wait);
575                 set_current_state(TASK_RUNNING);
576
577                 if (signal_pending(current))
578                         return -ERESTARTSYS;
579         }
580
581         spin_lock_irqsave(&acpi_bus_event_lock, flags);
582         if (!list_empty(&acpi_bus_event_list)) {
583                 entry = list_entry(acpi_bus_event_list.next,
584                                    struct acpi_bus_event, node);
585                 list_del(&entry->node);
586         }
587         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
588
589         if (!entry)
590                 return -ENODEV;
591
592         memcpy(event, entry, sizeof(struct acpi_bus_event));
593
594         kfree(entry);
595
596         return 0;
597 }
598
599 #endif  /* CONFIG_ACPI_PROC_EVENT */
600
601 /* --------------------------------------------------------------------------
602                              Notification Handling
603    -------------------------------------------------------------------------- */
604
605 static void acpi_bus_check_device(acpi_handle handle)
606 {
607         struct acpi_device *device;
608         acpi_status status;
609         struct acpi_device_status old_status;
610
611         if (acpi_bus_get_device(handle, &device))
612                 return;
613         if (!device)
614                 return;
615
616         old_status = device->status;
617
618         /*
619          * Make sure this device's parent is present before we go about
620          * messing with the device.
621          */
622         if (device->parent && !device->parent->status.present) {
623                 device->status = device->parent->status;
624                 return;
625         }
626
627         status = acpi_bus_get_status(device);
628         if (ACPI_FAILURE(status))
629                 return;
630
631         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
632                 return;
633
634         /*
635          * Device Insertion/Removal
636          */
637         if ((device->status.present) && !(old_status.present)) {
638                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
639                 /* TBD: Handle device insertion */
640         } else if (!(device->status.present) && (old_status.present)) {
641                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
642                 /* TBD: Handle device removal */
643         }
644 }
645
646 static void acpi_bus_check_scope(acpi_handle handle)
647 {
648         /* Status Change? */
649         acpi_bus_check_device(handle);
650
651         /*
652          * TBD: Enumerate child devices within this device's scope and
653          *       run acpi_bus_check_device()'s on them.
654          */
655 }
656
657 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
658 int register_acpi_bus_notifier(struct notifier_block *nb)
659 {
660         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
661 }
662 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
663
664 void unregister_acpi_bus_notifier(struct notifier_block *nb)
665 {
666         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
667 }
668 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
669
670 /**
671  * acpi_bus_notify
672  * ---------------
673  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
674  */
675 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
676 {
677         struct acpi_device *device = NULL;
678         struct acpi_driver *driver;
679
680         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
681                           type, handle));
682
683         blocking_notifier_call_chain(&acpi_bus_notify_list,
684                 type, (void *)handle);
685
686         switch (type) {
687
688         case ACPI_NOTIFY_BUS_CHECK:
689                 acpi_bus_check_scope(handle);
690                 /*
691                  * TBD: We'll need to outsource certain events to non-ACPI
692                  *      drivers via the device manager (device.c).
693                  */
694                 break;
695
696         case ACPI_NOTIFY_DEVICE_CHECK:
697                 acpi_bus_check_device(handle);
698                 /*
699                  * TBD: We'll need to outsource certain events to non-ACPI
700                  *      drivers via the device manager (device.c).
701                  */
702                 break;
703
704         case ACPI_NOTIFY_DEVICE_WAKE:
705                 /* TBD */
706                 break;
707
708         case ACPI_NOTIFY_EJECT_REQUEST:
709                 /* TBD */
710                 break;
711
712         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
713                 /* TBD: Exactly what does 'light' mean? */
714                 break;
715
716         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
717                 /* TBD */
718                 break;
719
720         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
721                 /* TBD */
722                 break;
723
724         case ACPI_NOTIFY_POWER_FAULT:
725                 /* TBD */
726                 break;
727
728         default:
729                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
730                                   "Received unknown/unsupported notification [%08x]\n",
731                                   type));
732                 break;
733         }
734
735         acpi_bus_get_device(handle, &device);
736         if (device) {
737                 driver = device->driver;
738                 if (driver && driver->ops.notify &&
739                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
740                         driver->ops.notify(device, type);
741         }
742 }
743
744 /* --------------------------------------------------------------------------
745                              Initialization/Cleanup
746    -------------------------------------------------------------------------- */
747
748 static int __init acpi_bus_init_irq(void)
749 {
750         acpi_status status = AE_OK;
751         union acpi_object arg = { ACPI_TYPE_INTEGER };
752         struct acpi_object_list arg_list = { 1, &arg };
753         char *message = NULL;
754
755
756         /*
757          * Let the system know what interrupt model we are using by
758          * evaluating the \_PIC object, if exists.
759          */
760
761         switch (acpi_irq_model) {
762         case ACPI_IRQ_MODEL_PIC:
763                 message = "PIC";
764                 break;
765         case ACPI_IRQ_MODEL_IOAPIC:
766                 message = "IOAPIC";
767                 break;
768         case ACPI_IRQ_MODEL_IOSAPIC:
769                 message = "IOSAPIC";
770                 break;
771         case ACPI_IRQ_MODEL_PLATFORM:
772                 message = "platform specific model";
773                 break;
774         default:
775                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
776                 return -ENODEV;
777         }
778
779         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
780
781         arg.integer.value = acpi_irq_model;
782
783         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
784         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
785                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
786                 return -ENODEV;
787         }
788
789         return 0;
790 }
791
792 u8 acpi_gbl_permanent_mmap;
793
794
795 void __init acpi_early_init(void)
796 {
797         acpi_status status = AE_OK;
798
799         if (acpi_disabled)
800                 return;
801
802         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
803
804         /* enable workarounds, unless strict ACPI spec. compliance */
805         if (!acpi_strict)
806                 acpi_gbl_enable_interpreter_slack = TRUE;
807
808         acpi_gbl_permanent_mmap = 1;
809
810         status = acpi_reallocate_root_table();
811         if (ACPI_FAILURE(status)) {
812                 printk(KERN_ERR PREFIX
813                        "Unable to reallocate ACPI tables\n");
814                 goto error0;
815         }
816
817         status = acpi_initialize_subsystem();
818         if (ACPI_FAILURE(status)) {
819                 printk(KERN_ERR PREFIX
820                        "Unable to initialize the ACPI Interpreter\n");
821                 goto error0;
822         }
823
824         status = acpi_load_tables();
825         if (ACPI_FAILURE(status)) {
826                 printk(KERN_ERR PREFIX
827                        "Unable to load the System Description Tables\n");
828                 goto error0;
829         }
830
831 #ifdef CONFIG_X86
832         if (!acpi_ioapic) {
833                 /* compatible (0) means level (3) */
834                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
835                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
836                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
837                 }
838                 /* Set PIC-mode SCI trigger type */
839                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
840                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
841         } else {
842                 /*
843                  * now that acpi_gbl_FADT is initialized,
844                  * update it with result from INT_SRC_OVR parsing
845                  */
846                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
847         }
848 #endif
849
850         status =
851             acpi_enable_subsystem(~
852                                   (ACPI_NO_HARDWARE_INIT |
853                                    ACPI_NO_ACPI_ENABLE));
854         if (ACPI_FAILURE(status)) {
855                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
856                 goto error0;
857         }
858
859         return;
860
861       error0:
862         disable_acpi();
863         return;
864 }
865
866 static int __init acpi_bus_init(void)
867 {
868         int result = 0;
869         acpi_status status = AE_OK;
870         extern acpi_status acpi_os_initialize1(void);
871
872         acpi_os_initialize1();
873
874         status =
875             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
876         if (ACPI_FAILURE(status)) {
877                 printk(KERN_ERR PREFIX
878                        "Unable to start the ACPI Interpreter\n");
879                 goto error1;
880         }
881
882         /*
883          * ACPI 2.0 requires the EC driver to be loaded and work before
884          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
885          * is called).
886          *
887          * This is accomplished by looking for the ECDT table, and getting
888          * the EC parameters out of that.
889          */
890         status = acpi_ec_ecdt_probe();
891         /* Ignore result. Not having an ECDT is not fatal. */
892
893         acpi_bus_osc_support();
894
895         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
896         if (ACPI_FAILURE(status)) {
897                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
898                 goto error1;
899         }
900
901         acpi_early_processor_set_pdc();
902
903         /*
904          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
905          * is necessary to enable it as early as possible.
906          */
907         acpi_boot_ec_enable();
908
909         printk(KERN_INFO PREFIX "Interpreter enabled\n");
910
911         /* Initialize sleep structures */
912         acpi_sleep_init();
913
914         /*
915          * Get the system interrupt model and evaluate \_PIC.
916          */
917         result = acpi_bus_init_irq();
918         if (result)
919                 goto error1;
920
921         /*
922          * Register the for all standard device notifications.
923          */
924         status =
925             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
926                                         &acpi_bus_notify, NULL);
927         if (ACPI_FAILURE(status)) {
928                 printk(KERN_ERR PREFIX
929                        "Unable to register for device notifications\n");
930                 goto error1;
931         }
932
933         /*
934          * Create the top ACPI proc directory
935          */
936         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
937
938         return 0;
939
940         /* Mimic structured exception handling */
941       error1:
942         acpi_terminate();
943         return -ENODEV;
944 }
945
946 struct kobject *acpi_kobj;
947
948 static int __init acpi_init(void)
949 {
950         int result = 0;
951
952
953         if (acpi_disabled) {
954                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
955                 return -ENODEV;
956         }
957
958         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
959         if (!acpi_kobj) {
960                 printk(KERN_WARNING "%s: kset create error\n", __func__);
961                 acpi_kobj = NULL;
962         }
963
964         init_acpi_device_notify();
965         result = acpi_bus_init();
966
967         if (!result) {
968                 pci_mmcfg_late_init();
969                 if (!(pm_flags & PM_APM))
970                         pm_flags |= PM_ACPI;
971                 else {
972                         printk(KERN_INFO PREFIX
973                                "APM is already active, exiting\n");
974                         disable_acpi();
975                         result = -ENODEV;
976                 }
977         } else
978                 disable_acpi();
979
980         if (acpi_disabled)
981                 return result;
982
983         /*
984          * If the laptop falls into the DMI check table, the power state check
985          * will be disabled in the course of device power transistion.
986          */
987         dmi_check_system(power_nocheck_dmi_table);
988
989         acpi_scan_init();
990         acpi_ec_init();
991         acpi_power_init();
992         acpi_system_init();
993         acpi_debug_init();
994         acpi_sleep_proc_init();
995         acpi_wakeup_device_init();
996         return result;
997 }
998
999 subsys_initcall(acpi_init);