6c62862901274a4f72e33f606b7c59a49bd2fe16
[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/list.h>
29 #include <linux/sched.h>
30 #include <linux/pm.h>
31 #include <linux/pm_legacy.h>
32 #include <linux/device.h>
33 #include <linux/proc_fs.h>
34 #ifdef CONFIG_X86
35 #include <asm/mpspec.h>
36 #endif
37 #include <acpi/acpi_bus.h>
38 #include <acpi/acpi_drivers.h>
39
40 #define _COMPONENT              ACPI_BUS_COMPONENT
41 ACPI_MODULE_NAME("acpi_bus")
42 #ifdef  CONFIG_X86
43 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
44 #endif
45
46 struct fadt_descriptor acpi_fadt;
47 EXPORT_SYMBOL(acpi_fadt);
48
49 struct acpi_device *acpi_root;
50 struct proc_dir_entry *acpi_root_dir;
51 EXPORT_SYMBOL(acpi_root_dir);
52
53 #define STRUCT_TO_INT(s)        (*((int*)&s))
54
55 /* --------------------------------------------------------------------------
56                                 Device Management
57    -------------------------------------------------------------------------- */
58
59 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
60 {
61         acpi_status status = AE_OK;
62
63         ACPI_FUNCTION_TRACE("acpi_bus_get_device");
64
65         if (!device)
66                 return_VALUE(-EINVAL);
67
68         /* TBD: Support fixed-feature devices */
69
70         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
71         if (ACPI_FAILURE(status) || !*device) {
72                 ACPI_EXCEPTION((AE_INFO, status, "No context for object [%p]", handle));
73                 return_VALUE(-ENODEV);
74         }
75
76         return_VALUE(0);
77 }
78
79 EXPORT_SYMBOL(acpi_bus_get_device);
80
81 int acpi_bus_get_status(struct acpi_device *device)
82 {
83         acpi_status status = AE_OK;
84         unsigned long sta = 0;
85
86         ACPI_FUNCTION_TRACE("acpi_bus_get_status");
87
88         if (!device)
89                 return_VALUE(-EINVAL);
90
91         /*
92          * Evaluate _STA if present.
93          */
94         if (device->flags.dynamic_status) {
95                 status =
96                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
97                 if (ACPI_FAILURE(status))
98                         return_VALUE(-ENODEV);
99                 STRUCT_TO_INT(device->status) = (int)sta;
100         }
101
102         /*
103          * Otherwise we assume the status of our parent (unless we don't
104          * have one, in which case status is implied).
105          */
106         else if (device->parent)
107                 device->status = device->parent->status;
108         else
109                 STRUCT_TO_INT(device->status) = 0x0F;
110
111         if (device->status.functional && !device->status.present) {
112                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
113                        "functional but not present; setting present\n",
114                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
115                 device->status.present = 1;
116         }
117
118         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
119                           device->pnp.bus_id,
120                           (u32) STRUCT_TO_INT(device->status)));
121
122         return_VALUE(0);
123 }
124
125 EXPORT_SYMBOL(acpi_bus_get_status);
126
127 /* --------------------------------------------------------------------------
128                                  Power Management
129    -------------------------------------------------------------------------- */
130
131 int acpi_bus_get_power(acpi_handle handle, int *state)
132 {
133         int result = 0;
134         acpi_status status = 0;
135         struct acpi_device *device = NULL;
136         unsigned long psc = 0;
137
138         ACPI_FUNCTION_TRACE("acpi_bus_get_power");
139
140         result = acpi_bus_get_device(handle, &device);
141         if (result)
142                 return_VALUE(result);
143
144         *state = ACPI_STATE_UNKNOWN;
145
146         if (!device->flags.power_manageable) {
147                 /* TBD: Non-recursive algorithm for walking up hierarchy */
148                 if (device->parent)
149                         *state = device->parent->power.state;
150                 else
151                         *state = ACPI_STATE_D0;
152         } else {
153                 /*
154                  * Get the device's power state either directly (via _PSC) or 
155                  * indirectly (via power resources).
156                  */
157                 if (device->power.flags.explicit_get) {
158                         status = acpi_evaluate_integer(device->handle, "_PSC",
159                                                        NULL, &psc);
160                         if (ACPI_FAILURE(status))
161                                 return_VALUE(-ENODEV);
162                         device->power.state = (int)psc;
163                 } else if (device->power.flags.power_resources) {
164                         result = acpi_power_get_inferred_state(device);
165                         if (result)
166                                 return_VALUE(result);
167                 }
168
169                 *state = device->power.state;
170         }
171
172         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
173                           device->pnp.bus_id, device->power.state));
174
175         return_VALUE(0);
176 }
177
178 EXPORT_SYMBOL(acpi_bus_get_power);
179
180 int acpi_bus_set_power(acpi_handle handle, int state)
181 {
182         int result = 0;
183         acpi_status status = AE_OK;
184         struct acpi_device *device = NULL;
185         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
186
187         ACPI_FUNCTION_TRACE("acpi_bus_set_power");
188
189         result = acpi_bus_get_device(handle, &device);
190         if (result)
191                 return_VALUE(result);
192
193         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
194                 return_VALUE(-EINVAL);
195
196         /* Make sure this is a valid target state */
197
198         if (!device->flags.power_manageable) {
199                 printk(KERN_DEBUG "Device `[%s]is not power manageable",
200                                 device->kobj.name);
201                 return_VALUE(-ENODEV);
202         }
203         /*
204          * Get device's current power state if it's unknown
205          * This means device power state isn't initialized or previous setting failed
206          */
207         if (!device->flags.force_power_state) {
208                 if (device->power.state == ACPI_STATE_UNKNOWN)
209                         acpi_bus_get_power(device->handle, &device->power.state);
210                 if (state == device->power.state) {
211                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
212                                           state));
213                         return_VALUE(0);
214                 }
215         }
216         if (!device->power.states[state].flags.valid) {
217                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
218                 return_VALUE(-ENODEV);
219         }
220         if (device->parent && (state < device->parent->power.state)) {
221                 printk(KERN_WARNING PREFIX
222                               "Cannot set device to a higher-powered"
223                               " state than parent\n");
224                 return_VALUE(-ENODEV);
225         }
226
227         /*
228          * Transition Power
229          * ----------------
230          * On transitions to a high-powered state we first apply power (via
231          * power resources) then evalute _PSx.  Conversly for transitions to
232          * a lower-powered state.
233          */
234         if (state < device->power.state) {
235                 if (device->power.flags.power_resources) {
236                         result = acpi_power_transition(device, state);
237                         if (result)
238                                 goto end;
239                 }
240                 if (device->power.states[state].flags.explicit_set) {
241                         status = acpi_evaluate_object(device->handle,
242                                                       object_name, NULL, NULL);
243                         if (ACPI_FAILURE(status)) {
244                                 result = -ENODEV;
245                                 goto end;
246                         }
247                 }
248         } else {
249                 if (device->power.states[state].flags.explicit_set) {
250                         status = acpi_evaluate_object(device->handle,
251                                                       object_name, NULL, NULL);
252                         if (ACPI_FAILURE(status)) {
253                                 result = -ENODEV;
254                                 goto end;
255                         }
256                 }
257                 if (device->power.flags.power_resources) {
258                         result = acpi_power_transition(device, state);
259                         if (result)
260                                 goto end;
261                 }
262         }
263
264       end:
265         if (result)
266                 printk(KERN_WARNING PREFIX
267                               "Transitioning device [%s] to D%d\n",
268                               device->pnp.bus_id, state);
269         else
270                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
271                                   "Device [%s] transitioned to D%d\n",
272                                   device->pnp.bus_id, state));
273
274         return_VALUE(result);
275 }
276
277 EXPORT_SYMBOL(acpi_bus_set_power);
278
279 /* --------------------------------------------------------------------------
280                                 Event Management
281    -------------------------------------------------------------------------- */
282
283 static DEFINE_SPINLOCK(acpi_bus_event_lock);
284
285 LIST_HEAD(acpi_bus_event_list);
286 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
287
288 extern int event_is_open;
289
290 int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
291 {
292         struct acpi_bus_event *event = NULL;
293         unsigned long flags = 0;
294
295         ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
296
297         if (!device)
298                 return_VALUE(-EINVAL);
299
300         /* drop event on the floor if no one's listening */
301         if (!event_is_open)
302                 return_VALUE(0);
303
304         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
305         if (!event)
306                 return_VALUE(-ENOMEM);
307
308         strcpy(event->device_class, device->pnp.device_class);
309         strcpy(event->bus_id, device->pnp.bus_id);
310         event->type = type;
311         event->data = data;
312
313         spin_lock_irqsave(&acpi_bus_event_lock, flags);
314         list_add_tail(&event->node, &acpi_bus_event_list);
315         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
316
317         wake_up_interruptible(&acpi_bus_event_queue);
318
319         return_VALUE(0);
320 }
321
322 EXPORT_SYMBOL(acpi_bus_generate_event);
323
324 int acpi_bus_receive_event(struct acpi_bus_event *event)
325 {
326         unsigned long flags = 0;
327         struct acpi_bus_event *entry = NULL;
328
329         DECLARE_WAITQUEUE(wait, current);
330
331         ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
332
333         if (!event)
334                 return_VALUE(-EINVAL);
335
336         if (list_empty(&acpi_bus_event_list)) {
337
338                 set_current_state(TASK_INTERRUPTIBLE);
339                 add_wait_queue(&acpi_bus_event_queue, &wait);
340
341                 if (list_empty(&acpi_bus_event_list))
342                         schedule();
343
344                 remove_wait_queue(&acpi_bus_event_queue, &wait);
345                 set_current_state(TASK_RUNNING);
346
347                 if (signal_pending(current))
348                         return_VALUE(-ERESTARTSYS);
349         }
350
351         spin_lock_irqsave(&acpi_bus_event_lock, flags);
352         entry =
353             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
354         if (entry)
355                 list_del(&entry->node);
356         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
357
358         if (!entry)
359                 return_VALUE(-ENODEV);
360
361         memcpy(event, entry, sizeof(struct acpi_bus_event));
362
363         kfree(entry);
364
365         return_VALUE(0);
366 }
367
368 EXPORT_SYMBOL(acpi_bus_receive_event);
369
370 /* --------------------------------------------------------------------------
371                              Notification Handling
372    -------------------------------------------------------------------------- */
373
374 static int
375 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
376 {
377         acpi_status status = 0;
378         struct acpi_device_status old_status;
379
380         ACPI_FUNCTION_TRACE("acpi_bus_check_device");
381
382         if (!device)
383                 return_VALUE(-EINVAL);
384
385         if (status_changed)
386                 *status_changed = 0;
387
388         old_status = device->status;
389
390         /*
391          * Make sure this device's parent is present before we go about
392          * messing with the device.
393          */
394         if (device->parent && !device->parent->status.present) {
395                 device->status = device->parent->status;
396                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
397                         if (status_changed)
398                                 *status_changed = 1;
399                 }
400                 return_VALUE(0);
401         }
402
403         status = acpi_bus_get_status(device);
404         if (ACPI_FAILURE(status))
405                 return_VALUE(-ENODEV);
406
407         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
408                 return_VALUE(0);
409
410         if (status_changed)
411                 *status_changed = 1;
412
413         /*
414          * Device Insertion/Removal
415          */
416         if ((device->status.present) && !(old_status.present)) {
417                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
418                 /* TBD: Handle device insertion */
419         } else if (!(device->status.present) && (old_status.present)) {
420                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
421                 /* TBD: Handle device removal */
422         }
423
424         return_VALUE(0);
425 }
426
427 static int acpi_bus_check_scope(struct acpi_device *device)
428 {
429         int result = 0;
430         int status_changed = 0;
431
432         ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
433
434         if (!device)
435                 return_VALUE(-EINVAL);
436
437         /* Status Change? */
438         result = acpi_bus_check_device(device, &status_changed);
439         if (result)
440                 return_VALUE(result);
441
442         if (!status_changed)
443                 return_VALUE(0);
444
445         /*
446          * TBD: Enumerate child devices within this device's scope and
447          *       run acpi_bus_check_device()'s on them.
448          */
449
450         return_VALUE(0);
451 }
452
453 /**
454  * acpi_bus_notify
455  * ---------------
456  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
457  */
458 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
459 {
460         int result = 0;
461         struct acpi_device *device = NULL;
462
463         ACPI_FUNCTION_TRACE("acpi_bus_notify");
464
465         if (acpi_bus_get_device(handle, &device))
466                 return_VOID;
467
468         switch (type) {
469
470         case ACPI_NOTIFY_BUS_CHECK:
471                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
472                                   "Received BUS CHECK notification for device [%s]\n",
473                                   device->pnp.bus_id));
474                 result = acpi_bus_check_scope(device);
475                 /* 
476                  * TBD: We'll need to outsource certain events to non-ACPI
477                  *      drivers via the device manager (device.c).
478                  */
479                 break;
480
481         case ACPI_NOTIFY_DEVICE_CHECK:
482                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
483                                   "Received DEVICE CHECK notification for device [%s]\n",
484                                   device->pnp.bus_id));
485                 result = acpi_bus_check_device(device, NULL);
486                 /* 
487                  * TBD: We'll need to outsource certain events to non-ACPI
488                  *      drivers via the device manager (device.c).
489                  */
490                 break;
491
492         case ACPI_NOTIFY_DEVICE_WAKE:
493                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
494                                   "Received DEVICE WAKE notification for device [%s]\n",
495                                   device->pnp.bus_id));
496                 /* TBD */
497                 break;
498
499         case ACPI_NOTIFY_EJECT_REQUEST:
500                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
501                                   "Received EJECT REQUEST notification for device [%s]\n",
502                                   device->pnp.bus_id));
503                 /* TBD */
504                 break;
505
506         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
507                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
508                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
509                                   device->pnp.bus_id));
510                 /* TBD: Exactly what does 'light' mean? */
511                 break;
512
513         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
514                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
515                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
516                                   device->pnp.bus_id));
517                 /* TBD */
518                 break;
519
520         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
521                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
522                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
523                                   device->pnp.bus_id));
524                 /* TBD */
525                 break;
526
527         case ACPI_NOTIFY_POWER_FAULT:
528                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
529                                   "Received POWER FAULT notification for device [%s]\n",
530                                   device->pnp.bus_id));
531                 /* TBD */
532                 break;
533
534         default:
535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536                                   "Received unknown/unsupported notification [%08x]\n",
537                                   type));
538                 break;
539         }
540
541         return_VOID;
542 }
543
544 /* --------------------------------------------------------------------------
545                              Initialization/Cleanup
546    -------------------------------------------------------------------------- */
547
548 static int __init acpi_bus_init_irq(void)
549 {
550         acpi_status status = AE_OK;
551         union acpi_object arg = { ACPI_TYPE_INTEGER };
552         struct acpi_object_list arg_list = { 1, &arg };
553         char *message = NULL;
554
555         ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
556
557         /* 
558          * Let the system know what interrupt model we are using by
559          * evaluating the \_PIC object, if exists.
560          */
561
562         switch (acpi_irq_model) {
563         case ACPI_IRQ_MODEL_PIC:
564                 message = "PIC";
565                 break;
566         case ACPI_IRQ_MODEL_IOAPIC:
567                 message = "IOAPIC";
568                 break;
569         case ACPI_IRQ_MODEL_IOSAPIC:
570                 message = "IOSAPIC";
571                 break;
572         default:
573                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
574                 return_VALUE(-ENODEV);
575         }
576
577         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
578
579         arg.integer.value = acpi_irq_model;
580
581         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
582         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
583                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
584                 return_VALUE(-ENODEV);
585         }
586
587         return_VALUE(0);
588 }
589
590 void __init acpi_early_init(void)
591 {
592         acpi_status status = AE_OK;
593         struct acpi_buffer buffer = { sizeof(acpi_fadt), &acpi_fadt };
594
595         ACPI_FUNCTION_TRACE("acpi_early_init");
596
597         if (acpi_disabled)
598                 return_VOID;
599
600         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
601
602         /* enable workarounds, unless strict ACPI spec. compliance */
603         if (!acpi_strict)
604                 acpi_gbl_enable_interpreter_slack = TRUE;
605
606         status = acpi_initialize_subsystem();
607         if (ACPI_FAILURE(status)) {
608                 printk(KERN_ERR PREFIX
609                        "Unable to initialize the ACPI Interpreter\n");
610                 goto error0;
611         }
612
613         status = acpi_load_tables();
614         if (ACPI_FAILURE(status)) {
615                 printk(KERN_ERR PREFIX
616                        "Unable to load the System Description Tables\n");
617                 goto error0;
618         }
619
620         /*
621          * Get a separate copy of the FADT for use by other drivers.
622          */
623         status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &buffer);
624         if (ACPI_FAILURE(status)) {
625                 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
626                 goto error0;
627         }
628 #ifdef CONFIG_X86
629         if (!acpi_ioapic) {
630                 extern acpi_interrupt_flags acpi_sci_flags;
631
632                 /* compatible (0) means level (3) */
633                 if (acpi_sci_flags.trigger == 0)
634                         acpi_sci_flags.trigger = 3;
635
636                 /* Set PIC-mode SCI trigger type */
637                 acpi_pic_sci_set_trigger(acpi_fadt.sci_int,
638                                          acpi_sci_flags.trigger);
639         } else {
640                 extern int acpi_sci_override_gsi;
641                 /*
642                  * now that acpi_fadt is initialized,
643                  * update it with result from INT_SRC_OVR parsing
644                  */
645                 acpi_fadt.sci_int = acpi_sci_override_gsi;
646         }
647 #endif
648
649         status =
650             acpi_enable_subsystem(~
651                                   (ACPI_NO_HARDWARE_INIT |
652                                    ACPI_NO_ACPI_ENABLE));
653         if (ACPI_FAILURE(status)) {
654                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
655                 goto error0;
656         }
657
658         return_VOID;
659
660       error0:
661         disable_acpi();
662         return_VOID;
663 }
664
665 static int __init acpi_bus_init(void)
666 {
667         int result = 0;
668         acpi_status status = AE_OK;
669         extern acpi_status acpi_os_initialize1(void);
670
671         ACPI_FUNCTION_TRACE("acpi_bus_init");
672
673         status = acpi_os_initialize1();
674
675         status =
676             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
677         if (ACPI_FAILURE(status)) {
678                 printk(KERN_ERR PREFIX
679                        "Unable to start the ACPI Interpreter\n");
680                 goto error1;
681         }
682
683         if (ACPI_FAILURE(status)) {
684                 printk(KERN_ERR PREFIX
685                        "Unable to initialize ACPI OS objects\n");
686                 goto error1;
687         }
688 #ifdef CONFIG_ACPI_EC
689         /*
690          * ACPI 2.0 requires the EC driver to be loaded and work before
691          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
692          * is called).
693          *
694          * This is accomplished by looking for the ECDT table, and getting 
695          * the EC parameters out of that.
696          */
697         status = acpi_ec_ecdt_probe();
698         /* Ignore result. Not having an ECDT is not fatal. */
699 #endif
700
701         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
702         if (ACPI_FAILURE(status)) {
703                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
704                 goto error1;
705         }
706
707         printk(KERN_INFO PREFIX "Interpreter enabled\n");
708
709         /*
710          * Get the system interrupt model and evaluate \_PIC.
711          */
712         result = acpi_bus_init_irq();
713         if (result)
714                 goto error1;
715
716         /*
717          * Register the for all standard device notifications.
718          */
719         status =
720             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
721                                         &acpi_bus_notify, NULL);
722         if (ACPI_FAILURE(status)) {
723                 printk(KERN_ERR PREFIX
724                        "Unable to register for device notifications\n");
725                 goto error1;
726         }
727
728         /*
729          * Create the top ACPI proc directory
730          */
731         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
732
733         return_VALUE(0);
734
735         /* Mimic structured exception handling */
736       error1:
737         acpi_terminate();
738         return_VALUE(-ENODEV);
739 }
740
741 decl_subsys(acpi, NULL, NULL);
742
743 static int __init acpi_init(void)
744 {
745         int result = 0;
746
747         ACPI_FUNCTION_TRACE("acpi_init");
748
749         if (acpi_disabled) {
750                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
751                 return_VALUE(-ENODEV);
752         }
753
754         firmware_register(&acpi_subsys);
755
756         result = acpi_bus_init();
757
758         if (!result) {
759 #ifdef CONFIG_PM_LEGACY
760                 if (!PM_IS_ACTIVE())
761                         pm_active = 1;
762                 else {
763                         printk(KERN_INFO PREFIX
764                                "APM is already active, exiting\n");
765                         disable_acpi();
766                         result = -ENODEV;
767                 }
768 #endif
769         } else
770                 disable_acpi();
771
772         return_VALUE(result);
773 }
774
775 subsys_initcall(acpi_init);