m68knommu: fix workqueues in 68328 serial driver
[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/kernel.h>
29 #include <linux/list.h>
30 #include <linux/sched.h>
31 #include <linux/pm.h>
32 #include <linux/pm_legacy.h>
33 #include <linux/device.h>
34 #include <linux/proc_fs.h>
35 #ifdef CONFIG_X86
36 #include <asm/mpspec.h>
37 #endif
38 #include <acpi/acpi_bus.h>
39 #include <acpi/acpi_drivers.h>
40
41 #define _COMPONENT              ACPI_BUS_COMPONENT
42 ACPI_MODULE_NAME("bus");
43 #ifdef  CONFIG_X86
44 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
45 #endif
46
47 struct acpi_device *acpi_root;
48 struct proc_dir_entry *acpi_root_dir;
49 EXPORT_SYMBOL(acpi_root_dir);
50
51 #define STRUCT_TO_INT(s)        (*((int*)&s))
52
53 /* --------------------------------------------------------------------------
54                                 Device Management
55    -------------------------------------------------------------------------- */
56
57 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
58 {
59         acpi_status status = AE_OK;
60
61
62         if (!device)
63                 return -EINVAL;
64
65         /* TBD: Support fixed-feature devices */
66
67         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
68         if (ACPI_FAILURE(status) || !*device) {
69                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
70                                   handle));
71                 return -ENODEV;
72         }
73
74         return 0;
75 }
76
77 EXPORT_SYMBOL(acpi_bus_get_device);
78
79 int acpi_bus_get_status(struct acpi_device *device)
80 {
81         acpi_status status = AE_OK;
82         unsigned long sta = 0;
83
84
85         if (!device)
86                 return -EINVAL;
87
88         /*
89          * Evaluate _STA if present.
90          */
91         if (device->flags.dynamic_status) {
92                 status =
93                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
94                 if (ACPI_FAILURE(status))
95                         return -ENODEV;
96                 STRUCT_TO_INT(device->status) = (int)sta;
97         }
98
99         /*
100          * Otherwise we assume the status of our parent (unless we don't
101          * have one, in which case status is implied).
102          */
103         else if (device->parent)
104                 device->status = device->parent->status;
105         else
106                 STRUCT_TO_INT(device->status) =
107                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
108                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
109
110         if (device->status.functional && !device->status.present) {
111                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
112                        "functional but not present; setting present\n",
113                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
114                 device->status.present = 1;
115         }
116
117         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
118                           device->pnp.bus_id,
119                           (u32) STRUCT_TO_INT(device->status)));
120
121         return 0;
122 }
123
124 EXPORT_SYMBOL(acpi_bus_get_status);
125
126 /* --------------------------------------------------------------------------
127                                  Power Management
128    -------------------------------------------------------------------------- */
129
130 int acpi_bus_get_power(acpi_handle handle, int *state)
131 {
132         int result = 0;
133         acpi_status status = 0;
134         struct acpi_device *device = NULL;
135         unsigned long psc = 0;
136
137
138         result = acpi_bus_get_device(handle, &device);
139         if (result)
140                 return result;
141
142         *state = ACPI_STATE_UNKNOWN;
143
144         if (!device->flags.power_manageable) {
145                 /* TBD: Non-recursive algorithm for walking up hierarchy */
146                 if (device->parent)
147                         *state = device->parent->power.state;
148                 else
149                         *state = ACPI_STATE_D0;
150         } else {
151                 /*
152                  * Get the device's power state either directly (via _PSC) or
153                  * indirectly (via power resources).
154                  */
155                 if (device->power.flags.explicit_get) {
156                         status = acpi_evaluate_integer(device->handle, "_PSC",
157                                                        NULL, &psc);
158                         if (ACPI_FAILURE(status))
159                                 return -ENODEV;
160                         device->power.state = (int)psc;
161                 } else if (device->power.flags.power_resources) {
162                         result = acpi_power_get_inferred_state(device);
163                         if (result)
164                                 return result;
165                 }
166
167                 *state = device->power.state;
168         }
169
170         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
171                           device->pnp.bus_id, device->power.state));
172
173         return 0;
174 }
175
176 EXPORT_SYMBOL(acpi_bus_get_power);
177
178 int acpi_bus_set_power(acpi_handle handle, int state)
179 {
180         int result = 0;
181         acpi_status status = AE_OK;
182         struct acpi_device *device = NULL;
183         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
184
185
186         result = acpi_bus_get_device(handle, &device);
187         if (result)
188                 return result;
189
190         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
191                 return -EINVAL;
192
193         /* Make sure this is a valid target state */
194
195         if (!device->flags.power_manageable) {
196                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
197                                 device->dev.kobj.name));
198                 return -ENODEV;
199         }
200         /*
201          * Get device's current power state if it's unknown
202          * This means device power state isn't initialized or previous setting failed
203          */
204         if ((device->power.state == ACPI_STATE_UNKNOWN) || device->flags.force_power_state)
205                 acpi_bus_get_power(device->handle, &device->power.state);
206         if ((state == device->power.state) && !device->flags.force_power_state) {
207                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
208                                   state));
209                 return 0;
210         }
211
212         if (!device->power.states[state].flags.valid) {
213                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
214                 return -ENODEV;
215         }
216         if (device->parent && (state < device->parent->power.state)) {
217                 printk(KERN_WARNING PREFIX
218                               "Cannot set device to a higher-powered"
219                               " state than parent\n");
220                 return -ENODEV;
221         }
222
223         /*
224          * Transition Power
225          * ----------------
226          * On transitions to a high-powered state we first apply power (via
227          * power resources) then evalute _PSx.  Conversly for transitions to
228          * a lower-powered state.
229          */
230         if (state < device->power.state) {
231                 if (device->power.flags.power_resources) {
232                         result = acpi_power_transition(device, state);
233                         if (result)
234                                 goto end;
235                 }
236                 if (device->power.states[state].flags.explicit_set) {
237                         status = acpi_evaluate_object(device->handle,
238                                                       object_name, NULL, NULL);
239                         if (ACPI_FAILURE(status)) {
240                                 result = -ENODEV;
241                                 goto end;
242                         }
243                 }
244         } else {
245                 if (device->power.states[state].flags.explicit_set) {
246                         status = acpi_evaluate_object(device->handle,
247                                                       object_name, NULL, NULL);
248                         if (ACPI_FAILURE(status)) {
249                                 result = -ENODEV;
250                                 goto end;
251                         }
252                 }
253                 if (device->power.flags.power_resources) {
254                         result = acpi_power_transition(device, state);
255                         if (result)
256                                 goto end;
257                 }
258         }
259
260       end:
261         if (result)
262                 printk(KERN_WARNING PREFIX
263                               "Transitioning device [%s] to D%d\n",
264                               device->pnp.bus_id, state);
265         else
266                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
267                                   "Device [%s] transitioned to D%d\n",
268                                   device->pnp.bus_id, state));
269
270         return result;
271 }
272
273 EXPORT_SYMBOL(acpi_bus_set_power);
274
275 /* --------------------------------------------------------------------------
276                                 Event Management
277    -------------------------------------------------------------------------- */
278
279 static DEFINE_SPINLOCK(acpi_bus_event_lock);
280
281 LIST_HEAD(acpi_bus_event_list);
282 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
283
284 extern int event_is_open;
285
286 int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
287 {
288         struct acpi_bus_event *event = NULL;
289         unsigned long flags = 0;
290
291
292         if (!device)
293                 return -EINVAL;
294
295         if (acpi_bus_generate_genetlink_event(device, type, data))
296                 printk(KERN_WARNING PREFIX
297                         "Failed to generate an ACPI event via genetlink!\n");
298
299         /* drop event on the floor if no one's listening */
300         if (!event_is_open)
301                 return 0;
302
303         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
304         if (!event)
305                 return -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 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
331         if (!event)
332                 return -EINVAL;
333
334         if (list_empty(&acpi_bus_event_list)) {
335
336                 set_current_state(TASK_INTERRUPTIBLE);
337                 add_wait_queue(&acpi_bus_event_queue, &wait);
338
339                 if (list_empty(&acpi_bus_event_list))
340                         schedule();
341
342                 remove_wait_queue(&acpi_bus_event_queue, &wait);
343                 set_current_state(TASK_RUNNING);
344
345                 if (signal_pending(current))
346                         return -ERESTARTSYS;
347         }
348
349         spin_lock_irqsave(&acpi_bus_event_lock, flags);
350         entry =
351             list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
352         if (entry)
353                 list_del(&entry->node);
354         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
355
356         if (!entry)
357                 return -ENODEV;
358
359         memcpy(event, entry, sizeof(struct acpi_bus_event));
360
361         kfree(entry);
362
363         return 0;
364 }
365
366 EXPORT_SYMBOL(acpi_bus_receive_event);
367
368 /* --------------------------------------------------------------------------
369                              Notification Handling
370    -------------------------------------------------------------------------- */
371
372 static int
373 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
374 {
375         acpi_status status = 0;
376         struct acpi_device_status old_status;
377
378
379         if (!device)
380                 return -EINVAL;
381
382         if (status_changed)
383                 *status_changed = 0;
384
385         old_status = device->status;
386
387         /*
388          * Make sure this device's parent is present before we go about
389          * messing with the device.
390          */
391         if (device->parent && !device->parent->status.present) {
392                 device->status = device->parent->status;
393                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
394                         if (status_changed)
395                                 *status_changed = 1;
396                 }
397                 return 0;
398         }
399
400         status = acpi_bus_get_status(device);
401         if (ACPI_FAILURE(status))
402                 return -ENODEV;
403
404         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
405                 return 0;
406
407         if (status_changed)
408                 *status_changed = 1;
409
410         /*
411          * Device Insertion/Removal
412          */
413         if ((device->status.present) && !(old_status.present)) {
414                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
415                 /* TBD: Handle device insertion */
416         } else if (!(device->status.present) && (old_status.present)) {
417                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
418                 /* TBD: Handle device removal */
419         }
420
421         return 0;
422 }
423
424 static int acpi_bus_check_scope(struct acpi_device *device)
425 {
426         int result = 0;
427         int status_changed = 0;
428
429
430         if (!device)
431                 return -EINVAL;
432
433         /* Status Change? */
434         result = acpi_bus_check_device(device, &status_changed);
435         if (result)
436                 return result;
437
438         if (!status_changed)
439                 return 0;
440
441         /*
442          * TBD: Enumerate child devices within this device's scope and
443          *       run acpi_bus_check_device()'s on them.
444          */
445
446         return 0;
447 }
448
449 /**
450  * acpi_bus_notify
451  * ---------------
452  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
453  */
454 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
455 {
456         int result = 0;
457         struct acpi_device *device = NULL;
458
459
460         if (acpi_bus_get_device(handle, &device))
461                 return;
462
463         switch (type) {
464
465         case ACPI_NOTIFY_BUS_CHECK:
466                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
467                                   "Received BUS CHECK notification for device [%s]\n",
468                                   device->pnp.bus_id));
469                 result = acpi_bus_check_scope(device);
470                 /*
471                  * TBD: We'll need to outsource certain events to non-ACPI
472                  *      drivers via the device manager (device.c).
473                  */
474                 break;
475
476         case ACPI_NOTIFY_DEVICE_CHECK:
477                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
478                                   "Received DEVICE CHECK notification for device [%s]\n",
479                                   device->pnp.bus_id));
480                 result = acpi_bus_check_device(device, NULL);
481                 /*
482                  * TBD: We'll need to outsource certain events to non-ACPI
483                  *      drivers via the device manager (device.c).
484                  */
485                 break;
486
487         case ACPI_NOTIFY_DEVICE_WAKE:
488                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
489                                   "Received DEVICE WAKE notification for device [%s]\n",
490                                   device->pnp.bus_id));
491                 /* TBD */
492                 break;
493
494         case ACPI_NOTIFY_EJECT_REQUEST:
495                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
496                                   "Received EJECT REQUEST notification for device [%s]\n",
497                                   device->pnp.bus_id));
498                 /* TBD */
499                 break;
500
501         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
502                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
503                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
504                                   device->pnp.bus_id));
505                 /* TBD: Exactly what does 'light' mean? */
506                 break;
507
508         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
509                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
510                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
511                                   device->pnp.bus_id));
512                 /* TBD */
513                 break;
514
515         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
517                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
518                                   device->pnp.bus_id));
519                 /* TBD */
520                 break;
521
522         case ACPI_NOTIFY_POWER_FAULT:
523                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
524                                   "Received POWER FAULT notification for device [%s]\n",
525                                   device->pnp.bus_id));
526                 /* TBD */
527                 break;
528
529         default:
530                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
531                                   "Received unknown/unsupported notification [%08x]\n",
532                                   type));
533                 break;
534         }
535
536         return;
537 }
538
539 /* --------------------------------------------------------------------------
540                              Initialization/Cleanup
541    -------------------------------------------------------------------------- */
542
543 static int __init acpi_bus_init_irq(void)
544 {
545         acpi_status status = AE_OK;
546         union acpi_object arg = { ACPI_TYPE_INTEGER };
547         struct acpi_object_list arg_list = { 1, &arg };
548         char *message = NULL;
549
550
551         /*
552          * Let the system know what interrupt model we are using by
553          * evaluating the \_PIC object, if exists.
554          */
555
556         switch (acpi_irq_model) {
557         case ACPI_IRQ_MODEL_PIC:
558                 message = "PIC";
559                 break;
560         case ACPI_IRQ_MODEL_IOAPIC:
561                 message = "IOAPIC";
562                 break;
563         case ACPI_IRQ_MODEL_IOSAPIC:
564                 message = "IOSAPIC";
565                 break;
566         case ACPI_IRQ_MODEL_PLATFORM:
567                 message = "platform specific model";
568                 break;
569         default:
570                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
571                 return -ENODEV;
572         }
573
574         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
575
576         arg.integer.value = acpi_irq_model;
577
578         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
579         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
580                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
581                 return -ENODEV;
582         }
583
584         return 0;
585 }
586
587 acpi_native_uint acpi_gbl_permanent_mmap;
588
589
590 void __init acpi_early_init(void)
591 {
592         acpi_status status = AE_OK;
593
594         if (acpi_disabled)
595                 return;
596
597         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
598
599         /* enable workarounds, unless strict ACPI spec. compliance */
600         if (!acpi_strict)
601                 acpi_gbl_enable_interpreter_slack = TRUE;
602
603         acpi_gbl_permanent_mmap = 1;
604
605         status = acpi_reallocate_root_table();
606         if (ACPI_FAILURE(status)) {
607                 printk(KERN_ERR PREFIX
608                        "Unable to reallocate ACPI tables\n");
609                 goto error0;
610         }
611
612         status = acpi_initialize_subsystem();
613         if (ACPI_FAILURE(status)) {
614                 printk(KERN_ERR PREFIX
615                        "Unable to initialize the ACPI Interpreter\n");
616                 goto error0;
617         }
618
619         status = acpi_load_tables();
620         if (ACPI_FAILURE(status)) {
621                 printk(KERN_ERR PREFIX
622                        "Unable to load the System Description Tables\n");
623                 goto error0;
624         }
625
626 #ifdef CONFIG_X86
627         if (!acpi_ioapic) {
628                 extern u8 acpi_sci_flags;
629
630                 /* compatible (0) means level (3) */
631                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
632                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
633                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
634                 }
635                 /* Set PIC-mode SCI trigger type */
636                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
637                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
638         } else {
639                 extern int acpi_sci_override_gsi;
640                 /*
641                  * now that acpi_gbl_FADT is initialized,
642                  * update it with result from INT_SRC_OVR parsing
643                  */
644                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
645         }
646 #endif
647
648         status =
649             acpi_enable_subsystem(~
650                                   (ACPI_NO_HARDWARE_INIT |
651                                    ACPI_NO_ACPI_ENABLE));
652         if (ACPI_FAILURE(status)) {
653                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
654                 goto error0;
655         }
656
657         return;
658
659       error0:
660         disable_acpi();
661         return;
662 }
663
664 static int __init acpi_bus_init(void)
665 {
666         int result = 0;
667         acpi_status status = AE_OK;
668         extern acpi_status acpi_os_initialize1(void);
669
670
671         status = acpi_os_initialize1();
672
673         status =
674             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
675         if (ACPI_FAILURE(status)) {
676                 printk(KERN_ERR PREFIX
677                        "Unable to start the ACPI Interpreter\n");
678                 goto error1;
679         }
680
681         if (ACPI_FAILURE(status)) {
682                 printk(KERN_ERR PREFIX
683                        "Unable to initialize ACPI OS objects\n");
684                 goto error1;
685         }
686 #ifdef CONFIG_ACPI_EC
687         /*
688          * ACPI 2.0 requires the EC driver to be loaded and work before
689          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
690          * is called).
691          *
692          * This is accomplished by looking for the ECDT table, and getting
693          * the EC parameters out of that.
694          */
695         status = acpi_ec_ecdt_probe();
696         /* Ignore result. Not having an ECDT is not fatal. */
697 #endif
698
699         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
700         if (ACPI_FAILURE(status)) {
701                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
702                 goto error1;
703         }
704
705         printk(KERN_INFO PREFIX "Interpreter enabled\n");
706
707         /* Initialize sleep structures */
708         acpi_sleep_init();
709
710         /*
711          * Get the system interrupt model and evaluate \_PIC.
712          */
713         result = acpi_bus_init_irq();
714         if (result)
715                 goto error1;
716
717         /*
718          * Register the for all standard device notifications.
719          */
720         status =
721             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
722                                         &acpi_bus_notify, NULL);
723         if (ACPI_FAILURE(status)) {
724                 printk(KERN_ERR PREFIX
725                        "Unable to register for device notifications\n");
726                 goto error1;
727         }
728
729         /*
730          * Create the top ACPI proc directory
731          */
732         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
733
734         return 0;
735
736         /* Mimic structured exception handling */
737       error1:
738         acpi_terminate();
739         return -ENODEV;
740 }
741
742 decl_subsys(acpi, NULL, NULL);
743
744 static int __init acpi_init(void)
745 {
746         int result = 0;
747
748
749         if (acpi_disabled) {
750                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
751                 return -ENODEV;
752         }
753
754         result = firmware_register(&acpi_subsys);
755         if (result < 0)
756                 printk(KERN_WARNING "%s: firmware_register error: %d\n",
757                         __FUNCTION__, result);
758
759         result = acpi_bus_init();
760
761         if (!result) {
762 #ifdef CONFIG_PM_LEGACY
763                 if (!PM_IS_ACTIVE())
764                         pm_active = 1;
765                 else {
766                         printk(KERN_INFO PREFIX
767                                "APM is already active, exiting\n");
768                         disable_acpi();
769                         result = -ENODEV;
770                 }
771 #endif
772         } else
773                 disable_acpi();
774
775         return result;
776 }
777
778 subsys_initcall(acpi_init);