[ACPI] IA64 build: blacklist.c is used only on X86
[linux-2.6] / 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 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_DEBUG_PRINT((ACPI_DB_WARN, "No context for object [%p]\n",
73                                   handle));
74                 return_VALUE(-ENODEV);
75         }
76
77         return_VALUE(0);
78 }
79
80 EXPORT_SYMBOL(acpi_bus_get_device);
81
82 int acpi_bus_get_status(struct acpi_device *device)
83 {
84         acpi_status status = AE_OK;
85         unsigned long sta = 0;
86
87         ACPI_FUNCTION_TRACE("acpi_bus_get_status");
88
89         if (!device)
90                 return_VALUE(-EINVAL);
91
92         /*
93          * Evaluate _STA if present.
94          */
95         if (device->flags.dynamic_status) {
96                 status =
97                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
98                 if (ACPI_FAILURE(status))
99                         return_VALUE(-ENODEV);
100                 STRUCT_TO_INT(device->status) = (int)sta;
101         }
102
103         /*
104          * Otherwise we assume the status of our parent (unless we don't
105          * have one, in which case status is implied).
106          */
107         else if (device->parent)
108                 device->status = device->parent->status;
109         else
110                 STRUCT_TO_INT(device->status) = 0x0F;
111
112         if (device->status.functional && !device->status.present) {
113                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
114                        "functional but not present; setting present\n",
115                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
116                 device->status.present = 1;
117         }
118
119         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
120                           device->pnp.bus_id,
121                           (u32) STRUCT_TO_INT(device->status)));
122
123         return_VALUE(0);
124 }
125
126 EXPORT_SYMBOL(acpi_bus_get_status);
127
128 /* --------------------------------------------------------------------------
129                                  Power Management
130    -------------------------------------------------------------------------- */
131
132 int acpi_bus_get_power(acpi_handle handle, int *state)
133 {
134         int result = 0;
135         acpi_status status = 0;
136         struct acpi_device *device = NULL;
137         unsigned long psc = 0;
138
139         ACPI_FUNCTION_TRACE("acpi_bus_get_power");
140
141         result = acpi_bus_get_device(handle, &device);
142         if (result)
143                 return_VALUE(result);
144
145         *state = ACPI_STATE_UNKNOWN;
146
147         if (!device->flags.power_manageable) {
148                 /* TBD: Non-recursive algorithm for walking up hierarchy */
149                 if (device->parent)
150                         *state = device->parent->power.state;
151                 else
152                         *state = ACPI_STATE_D0;
153         } else {
154                 /*
155                  * Get the device's power state either directly (via _PSC) or 
156                  * indirectly (via power resources).
157                  */
158                 if (device->power.flags.explicit_get) {
159                         status = acpi_evaluate_integer(device->handle, "_PSC",
160                                                        NULL, &psc);
161                         if (ACPI_FAILURE(status))
162                                 return_VALUE(-ENODEV);
163                         device->power.state = (int)psc;
164                 } else if (device->power.flags.power_resources) {
165                         result = acpi_power_get_inferred_state(device);
166                         if (result)
167                                 return_VALUE(result);
168                 }
169
170                 *state = device->power.state;
171         }
172
173         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
174                           device->pnp.bus_id, device->power.state));
175
176         return_VALUE(0);
177 }
178
179 EXPORT_SYMBOL(acpi_bus_get_power);
180
181 int acpi_bus_set_power(acpi_handle handle, int state)
182 {
183         int result = 0;
184         acpi_status status = AE_OK;
185         struct acpi_device *device = NULL;
186         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
187
188         ACPI_FUNCTION_TRACE("acpi_bus_set_power");
189
190         result = acpi_bus_get_device(handle, &device);
191         if (result)
192                 return_VALUE(result);
193
194         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
195                 return_VALUE(-EINVAL);
196
197         /* Make sure this is a valid target state */
198
199         if (!device->flags.power_manageable) {
200                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
201                                   "Device is not power manageable\n"));
202                 return_VALUE(-ENODEV);
203         }
204         /*
205          * Get device's current power state if it's unknown
206          * This means device power state isn't initialized or previous setting failed
207          */
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         if (!device->power.states[state].flags.valid) {
216                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n",
217                                   state));
218                 return_VALUE(-ENODEV);
219         }
220         if (device->parent && (state < device->parent->power.state)) {
221                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
222                                   "Cannot set device to a higher-powered state than parent\n"));
223                 return_VALUE(-ENODEV);
224         }
225
226         /*
227          * Transition Power
228          * ----------------
229          * On transitions to a high-powered state we first apply power (via
230          * power resources) then evalute _PSx.  Conversly for transitions to
231          * a lower-powered state.
232          */
233         if (state < device->power.state) {
234                 if (device->power.flags.power_resources) {
235                         result = acpi_power_transition(device, state);
236                         if (result)
237                                 goto end;
238                 }
239                 if (device->power.states[state].flags.explicit_set) {
240                         status = acpi_evaluate_object(device->handle,
241                                                       object_name, NULL, NULL);
242                         if (ACPI_FAILURE(status)) {
243                                 result = -ENODEV;
244                                 goto end;
245                         }
246                 }
247         } else {
248                 if (device->power.states[state].flags.explicit_set) {
249                         status = acpi_evaluate_object(device->handle,
250                                                       object_name, NULL, NULL);
251                         if (ACPI_FAILURE(status)) {
252                                 result = -ENODEV;
253                                 goto end;
254                         }
255                 }
256                 if (device->power.flags.power_resources) {
257                         result = acpi_power_transition(device, state);
258                         if (result)
259                                 goto end;
260                 }
261         }
262
263       end:
264         if (result)
265                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
266                                   "Error transitioning device [%s] to D%d\n",
267                                   device->pnp.bus_id, state));
268         else
269                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
270                                   "Device [%s] transitioned to D%d\n",
271                                   device->pnp.bus_id, state));
272
273         return_VALUE(result);
274 }
275
276 EXPORT_SYMBOL(acpi_bus_set_power);
277
278 /* --------------------------------------------------------------------------
279                                 Event Management
280    -------------------------------------------------------------------------- */
281
282 static DEFINE_SPINLOCK(acpi_bus_event_lock);
283
284 LIST_HEAD(acpi_bus_event_list);
285 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
286
287 extern int event_is_open;
288
289 int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
290 {
291         struct acpi_bus_event *event = NULL;
292         unsigned long flags = 0;
293
294         ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
295
296         if (!device)
297                 return_VALUE(-EINVAL);
298
299         /* drop event on the floor if no one's listening */
300         if (!event_is_open)
301                 return_VALUE(0);
302
303         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
304         if (!event)
305                 return_VALUE(-ENOMEM);
306
307         strcpy(event->device_class, device->pnp.device_class);
308         strcpy(event->bus_id, device->pnp.bus_id);
309         event->type = type;
310         event->data = data;
311
312         spin_lock_irqsave(&acpi_bus_event_lock, flags);
313         list_add_tail(&event->node, &acpi_bus_event_list);
314         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
315
316         wake_up_interruptible(&acpi_bus_event_queue);
317
318         return_VALUE(0);
319 }
320
321 EXPORT_SYMBOL(acpi_bus_generate_event);
322
323 int acpi_bus_receive_event(struct acpi_bus_event *event)
324 {
325         unsigned long flags = 0;
326         struct acpi_bus_event *entry = NULL;
327
328         DECLARE_WAITQUEUE(wait, current);
329
330         ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
331
332         if (!event)
333                 return_VALUE(-EINVAL);
334
335         if (list_empty(&acpi_bus_event_list)) {
336
337                 set_current_state(TASK_INTERRUPTIBLE);
338                 add_wait_queue(&acpi_bus_event_queue, &wait);
339
340                 if (list_empty(&acpi_bus_event_list))
341                         schedule();
342
343                 remove_wait_queue(&acpi_bus_event_queue, &wait);
344                 set_current_state(TASK_RUNNING);
345
346                 if (signal_pending(current))
347                         return_VALUE(-ERESTARTSYS);
348         }
349
350         spin_lock_irqsave(&acpi_bus_event_lock, flags);
351         entry =
352             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
353         if (entry)
354                 list_del(&entry->node);
355         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
356
357         if (!entry)
358                 return_VALUE(-ENODEV);
359
360         memcpy(event, entry, sizeof(struct acpi_bus_event));
361
362         kfree(entry);
363
364         return_VALUE(0);
365 }
366
367 EXPORT_SYMBOL(acpi_bus_receive_event);
368
369 /* --------------------------------------------------------------------------
370                              Notification Handling
371    -------------------------------------------------------------------------- */
372
373 static int
374 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
375 {
376         acpi_status status = 0;
377         struct acpi_device_status old_status;
378
379         ACPI_FUNCTION_TRACE("acpi_bus_check_device");
380
381         if (!device)
382                 return_VALUE(-EINVAL);
383
384         if (status_changed)
385                 *status_changed = 0;
386
387         old_status = device->status;
388
389         /*
390          * Make sure this device's parent is present before we go about
391          * messing with the device.
392          */
393         if (device->parent && !device->parent->status.present) {
394                 device->status = device->parent->status;
395                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
396                         if (status_changed)
397                                 *status_changed = 1;
398                 }
399                 return_VALUE(0);
400         }
401
402         status = acpi_bus_get_status(device);
403         if (ACPI_FAILURE(status))
404                 return_VALUE(-ENODEV);
405
406         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
407                 return_VALUE(0);
408
409         if (status_changed)
410                 *status_changed = 1;
411
412         /*
413          * Device Insertion/Removal
414          */
415         if ((device->status.present) && !(old_status.present)) {
416                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
417                 /* TBD: Handle device insertion */
418         } else if (!(device->status.present) && (old_status.present)) {
419                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
420                 /* TBD: Handle device removal */
421         }
422
423         return_VALUE(0);
424 }
425
426 static int acpi_bus_check_scope(struct acpi_device *device)
427 {
428         int result = 0;
429         int status_changed = 0;
430
431         ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
432
433         if (!device)
434                 return_VALUE(-EINVAL);
435
436         /* Status Change? */
437         result = acpi_bus_check_device(device, &status_changed);
438         if (result)
439                 return_VALUE(result);
440
441         if (!status_changed)
442                 return_VALUE(0);
443
444         /*
445          * TBD: Enumerate child devices within this device's scope and
446          *       run acpi_bus_check_device()'s on them.
447          */
448
449         return_VALUE(0);
450 }
451
452 /**
453  * acpi_bus_notify
454  * ---------------
455  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
456  */
457 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
458 {
459         int result = 0;
460         struct acpi_device *device = NULL;
461
462         ACPI_FUNCTION_TRACE("acpi_bus_notify");
463
464         if (acpi_bus_get_device(handle, &device))
465                 return_VOID;
466
467         switch (type) {
468
469         case ACPI_NOTIFY_BUS_CHECK:
470                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
471                                   "Received BUS CHECK notification for device [%s]\n",
472                                   device->pnp.bus_id));
473                 result = acpi_bus_check_scope(device);
474                 /* 
475                  * TBD: We'll need to outsource certain events to non-ACPI
476                  *      drivers via the device manager (device.c).
477                  */
478                 break;
479
480         case ACPI_NOTIFY_DEVICE_CHECK:
481                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
482                                   "Received DEVICE CHECK notification for device [%s]\n",
483                                   device->pnp.bus_id));
484                 result = acpi_bus_check_device(device, NULL);
485                 /* 
486                  * TBD: We'll need to outsource certain events to non-ACPI
487                  *      drivers via the device manager (device.c).
488                  */
489                 break;
490
491         case ACPI_NOTIFY_DEVICE_WAKE:
492                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
493                                   "Received DEVICE WAKE notification for device [%s]\n",
494                                   device->pnp.bus_id));
495                 /* TBD */
496                 break;
497
498         case ACPI_NOTIFY_EJECT_REQUEST:
499                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
500                                   "Received EJECT REQUEST notification for device [%s]\n",
501                                   device->pnp.bus_id));
502                 /* TBD */
503                 break;
504
505         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
506                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
507                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
508                                   device->pnp.bus_id));
509                 /* TBD: Exactly what does 'light' mean? */
510                 break;
511
512         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
513                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
514                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
515                                   device->pnp.bus_id));
516                 /* TBD */
517                 break;
518
519         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
520                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
521                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
522                                   device->pnp.bus_id));
523                 /* TBD */
524                 break;
525
526         case ACPI_NOTIFY_POWER_FAULT:
527                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
528                                   "Received POWER FAULT notification for device [%s]\n",
529                                   device->pnp.bus_id));
530                 /* TBD */
531                 break;
532
533         default:
534                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
535                                   "Received unknown/unsupported notification [%08x]\n",
536                                   type));
537                 break;
538         }
539
540         return_VOID;
541 }
542
543 /* --------------------------------------------------------------------------
544                              Initialization/Cleanup
545    -------------------------------------------------------------------------- */
546
547 static int __init acpi_bus_init_irq(void)
548 {
549         acpi_status status = AE_OK;
550         union acpi_object arg = { ACPI_TYPE_INTEGER };
551         struct acpi_object_list arg_list = { 1, &arg };
552         char *message = NULL;
553
554         ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
555
556         /* 
557          * Let the system know what interrupt model we are using by
558          * evaluating the \_PIC object, if exists.
559          */
560
561         switch (acpi_irq_model) {
562         case ACPI_IRQ_MODEL_PIC:
563                 message = "PIC";
564                 break;
565         case ACPI_IRQ_MODEL_IOAPIC:
566                 message = "IOAPIC";
567                 break;
568         case ACPI_IRQ_MODEL_IOSAPIC:
569                 message = "IOSAPIC";
570                 break;
571         default:
572                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
573                 return_VALUE(-ENODEV);
574         }
575
576         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
577
578         arg.integer.value = acpi_irq_model;
579
580         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
581         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
582                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
583                 return_VALUE(-ENODEV);
584         }
585
586         return_VALUE(0);
587 }
588
589 void __init acpi_early_init(void)
590 {
591         acpi_status status = AE_OK;
592         struct acpi_buffer buffer = { sizeof(acpi_fadt), &acpi_fadt };
593
594         ACPI_FUNCTION_TRACE("acpi_early_init");
595
596         if (acpi_disabled)
597                 return_VOID;
598
599         /* enable workarounds, unless strict ACPI spec. compliance */
600         if (!acpi_strict)
601                 acpi_gbl_enable_interpreter_slack = TRUE;
602
603         status = acpi_initialize_subsystem();
604         if (ACPI_FAILURE(status)) {
605                 printk(KERN_ERR PREFIX
606                        "Unable to initialize the ACPI Interpreter\n");
607                 goto error0;
608         }
609
610         status = acpi_load_tables();
611         if (ACPI_FAILURE(status)) {
612                 printk(KERN_ERR PREFIX
613                        "Unable to load the System Description Tables\n");
614                 goto error0;
615         }
616
617         /*
618          * Get a separate copy of the FADT for use by other drivers.
619          */
620         status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
621         if (ACPI_FAILURE(status)) {
622                 printk(KERN_ERR PREFIX "Unable to get the FADT\n");
623                 goto error0;
624         }
625 #ifdef CONFIG_X86
626         if (!acpi_ioapic) {
627                 extern acpi_interrupt_flags acpi_sci_flags;
628
629                 /* compatible (0) means level (3) */
630                 if (acpi_sci_flags.trigger == 0)
631                         acpi_sci_flags.trigger = 3;
632
633                 /* Set PIC-mode SCI trigger type */
634                 acpi_pic_sci_set_trigger(acpi_fadt.sci_int,
635                                          acpi_sci_flags.trigger);
636         } else {
637                 extern int acpi_sci_override_gsi;
638                 /*
639                  * now that acpi_fadt is initialized,
640                  * update it with result from INT_SRC_OVR parsing
641                  */
642                 acpi_fadt.sci_int = acpi_sci_override_gsi;
643         }
644 #endif
645
646         status =
647             acpi_enable_subsystem(~
648                                   (ACPI_NO_HARDWARE_INIT |
649                                    ACPI_NO_ACPI_ENABLE));
650         if (ACPI_FAILURE(status)) {
651                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
652                 goto error0;
653         }
654
655         return_VOID;
656
657       error0:
658         disable_acpi();
659         return_VOID;
660 }
661
662 static int __init acpi_bus_init(void)
663 {
664         int result = 0;
665         acpi_status status = AE_OK;
666         extern acpi_status acpi_os_initialize1(void);
667
668         ACPI_FUNCTION_TRACE("acpi_bus_init");
669
670         status = acpi_os_initialize1();
671
672         status =
673             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
674         if (ACPI_FAILURE(status)) {
675                 printk(KERN_ERR PREFIX
676                        "Unable to start the ACPI Interpreter\n");
677                 goto error1;
678         }
679
680         if (ACPI_FAILURE(status)) {
681                 printk(KERN_ERR PREFIX
682                        "Unable to initialize ACPI OS objects\n");
683                 goto error1;
684         }
685 #ifdef CONFIG_ACPI_EC
686         /*
687          * ACPI 2.0 requires the EC driver to be loaded and work before
688          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
689          * is called).
690          *
691          * This is accomplished by looking for the ECDT table, and getting 
692          * the EC parameters out of that.
693          */
694         status = acpi_ec_ecdt_probe();
695         /* Ignore result. Not having an ECDT is not fatal. */
696 #endif
697
698         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
699         if (ACPI_FAILURE(status)) {
700                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
701                 goto error1;
702         }
703
704         printk(KERN_INFO PREFIX "Interpreter enabled\n");
705
706         /*
707          * Get the system interrupt model and evaluate \_PIC.
708          */
709         result = acpi_bus_init_irq();
710         if (result)
711                 goto error1;
712
713         /*
714          * Register the for all standard device notifications.
715          */
716         status =
717             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
718                                         &acpi_bus_notify, NULL);
719         if (ACPI_FAILURE(status)) {
720                 printk(KERN_ERR PREFIX
721                        "Unable to register for device notifications\n");
722                 goto error1;
723         }
724
725         /*
726          * Create the top ACPI proc directory
727          */
728         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
729
730         return_VALUE(0);
731
732         /* Mimic structured exception handling */
733       error1:
734         acpi_terminate();
735         return_VALUE(-ENODEV);
736 }
737
738 decl_subsys(acpi, NULL, NULL);
739
740 static int __init acpi_init(void)
741 {
742         int result = 0;
743
744         ACPI_FUNCTION_TRACE("acpi_init");
745
746         printk(KERN_INFO PREFIX "Subsystem revision %08x\n", ACPI_CA_VERSION);
747
748         if (acpi_disabled) {
749                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
750                 return_VALUE(-ENODEV);
751         }
752
753         firmware_register(&acpi_subsys);
754
755         result = acpi_bus_init();
756
757         if (!result) {
758 #ifdef CONFIG_PM_LEGACY
759                 if (!PM_IS_ACTIVE())
760                         pm_active = 1;
761                 else {
762                         printk(KERN_INFO PREFIX
763                                "APM is already active, exiting\n");
764                         disable_acpi();
765                         result = -ENODEV;
766                 }
767 #endif
768         } else
769                 disable_acpi();
770
771         return_VALUE(result);
772 }
773
774 subsys_initcall(acpi_init);