crypto: talitos - Freescale integrated security engine (SEC) 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/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
42 #define _COMPONENT              ACPI_BUS_COMPONENT
43 ACPI_MODULE_NAME("bus");
44
45 struct acpi_device *acpi_root;
46 struct proc_dir_entry *acpi_root_dir;
47 EXPORT_SYMBOL(acpi_root_dir);
48
49 #define STRUCT_TO_INT(s)        (*((int*)&s))
50
51 /* --------------------------------------------------------------------------
52                                 Device Management
53    -------------------------------------------------------------------------- */
54
55 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
56 {
57         acpi_status status = AE_OK;
58
59
60         if (!device)
61                 return -EINVAL;
62
63         /* TBD: Support fixed-feature devices */
64
65         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
66         if (ACPI_FAILURE(status) || !*device) {
67                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
68                                   handle));
69                 return -ENODEV;
70         }
71
72         return 0;
73 }
74
75 EXPORT_SYMBOL(acpi_bus_get_device);
76
77 int acpi_bus_get_status(struct acpi_device *device)
78 {
79         acpi_status status = AE_OK;
80         unsigned long sta = 0;
81
82
83         if (!device)
84                 return -EINVAL;
85
86         /*
87          * Evaluate _STA if present.
88          */
89         if (device->flags.dynamic_status) {
90                 status =
91                     acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
92                 if (ACPI_FAILURE(status))
93                         return -ENODEV;
94                 STRUCT_TO_INT(device->status) = (int)sta;
95         }
96
97         /*
98          * Otherwise we assume the status of our parent (unless we don't
99          * have one, in which case status is implied).
100          */
101         else if (device->parent)
102                 device->status = device->parent->status;
103         else
104                 STRUCT_TO_INT(device->status) =
105                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
106                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
107
108         if (device->status.functional && !device->status.present) {
109                 printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
110                        "functional but not present; setting present\n",
111                        device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
112                 device->status.present = 1;
113         }
114
115         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
116                           device->pnp.bus_id,
117                           (u32) STRUCT_TO_INT(device->status)));
118
119         return 0;
120 }
121
122 EXPORT_SYMBOL(acpi_bus_get_status);
123
124 void acpi_bus_private_data_handler(acpi_handle handle,
125                                    u32 function, void *context)
126 {
127         return;
128 }
129 EXPORT_SYMBOL(acpi_bus_private_data_handler);
130
131 int acpi_bus_get_private_data(acpi_handle handle, void **data)
132 {
133         acpi_status status = AE_OK;
134
135         if (!*data)
136                 return -EINVAL;
137
138         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
139         if (ACPI_FAILURE(status) || !*data) {
140                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
141                                 handle));
142                 return -ENODEV;
143         }
144
145         return 0;
146 }
147 EXPORT_SYMBOL(acpi_bus_get_private_data);
148
149 /* --------------------------------------------------------------------------
150                                  Power Management
151    -------------------------------------------------------------------------- */
152
153 int acpi_bus_get_power(acpi_handle handle, int *state)
154 {
155         int result = 0;
156         acpi_status status = 0;
157         struct acpi_device *device = NULL;
158         unsigned long psc = 0;
159
160
161         result = acpi_bus_get_device(handle, &device);
162         if (result)
163                 return result;
164
165         *state = ACPI_STATE_UNKNOWN;
166
167         if (!device->flags.power_manageable) {
168                 /* TBD: Non-recursive algorithm for walking up hierarchy */
169                 if (device->parent)
170                         *state = device->parent->power.state;
171                 else
172                         *state = ACPI_STATE_D0;
173         } else {
174                 /*
175                  * Get the device's power state either directly (via _PSC) or
176                  * indirectly (via power resources).
177                  */
178                 if (device->power.flags.explicit_get) {
179                         status = acpi_evaluate_integer(device->handle, "_PSC",
180                                                        NULL, &psc);
181                         if (ACPI_FAILURE(status))
182                                 return -ENODEV;
183                         device->power.state = (int)psc;
184                 } else if (device->power.flags.power_resources) {
185                         result = acpi_power_get_inferred_state(device);
186                         if (result)
187                                 return result;
188                 }
189
190                 *state = device->power.state;
191         }
192
193         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
194                           device->pnp.bus_id, device->power.state));
195
196         return 0;
197 }
198
199 EXPORT_SYMBOL(acpi_bus_get_power);
200
201 int acpi_bus_set_power(acpi_handle handle, int state)
202 {
203         int result = 0;
204         acpi_status status = AE_OK;
205         struct acpi_device *device = NULL;
206         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
207
208
209         result = acpi_bus_get_device(handle, &device);
210         if (result)
211                 return result;
212
213         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
214                 return -EINVAL;
215
216         /* Make sure this is a valid target state */
217
218         if (!device->flags.power_manageable) {
219                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
220                                 kobject_name(&device->dev.kobj)));
221                 return -ENODEV;
222         }
223         /*
224          * Get device's current power state
225          */
226         acpi_bus_get_power(device->handle, &device->power.state);
227         if ((state == device->power.state) && !device->flags.force_power_state) {
228                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
229                                   state));
230                 return 0;
231         }
232
233         if (!device->power.states[state].flags.valid) {
234                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
235                 return -ENODEV;
236         }
237         if (device->parent && (state < device->parent->power.state)) {
238                 printk(KERN_WARNING PREFIX
239                               "Cannot set device to a higher-powered"
240                               " state than parent\n");
241                 return -ENODEV;
242         }
243
244         /*
245          * Transition Power
246          * ----------------
247          * On transitions to a high-powered state we first apply power (via
248          * power resources) then evalute _PSx.  Conversly for transitions to
249          * a lower-powered state.
250          */
251         if (state < device->power.state) {
252                 if (device->power.flags.power_resources) {
253                         result = acpi_power_transition(device, state);
254                         if (result)
255                                 goto end;
256                 }
257                 if (device->power.states[state].flags.explicit_set) {
258                         status = acpi_evaluate_object(device->handle,
259                                                       object_name, NULL, NULL);
260                         if (ACPI_FAILURE(status)) {
261                                 result = -ENODEV;
262                                 goto end;
263                         }
264                 }
265         } else {
266                 if (device->power.states[state].flags.explicit_set) {
267                         status = acpi_evaluate_object(device->handle,
268                                                       object_name, NULL, NULL);
269                         if (ACPI_FAILURE(status)) {
270                                 result = -ENODEV;
271                                 goto end;
272                         }
273                 }
274                 if (device->power.flags.power_resources) {
275                         result = acpi_power_transition(device, state);
276                         if (result)
277                                 goto end;
278                 }
279         }
280
281       end:
282         if (result)
283                 printk(KERN_WARNING PREFIX
284                               "Transitioning device [%s] to D%d\n",
285                               device->pnp.bus_id, state);
286         else {
287                 device->power.state = state;
288                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
289                                   "Device [%s] transitioned to D%d\n",
290                                   device->pnp.bus_id, state));
291         }
292
293         return result;
294 }
295
296 EXPORT_SYMBOL(acpi_bus_set_power);
297
298 /* --------------------------------------------------------------------------
299                                 Event Management
300    -------------------------------------------------------------------------- */
301
302 #ifdef CONFIG_ACPI_PROC_EVENT
303 static DEFINE_SPINLOCK(acpi_bus_event_lock);
304
305 LIST_HEAD(acpi_bus_event_list);
306 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
307
308 extern int event_is_open;
309
310 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
311 {
312         struct acpi_bus_event *event;
313         unsigned long flags = 0;
314
315         /* drop event on the floor if no one's listening */
316         if (!event_is_open)
317                 return 0;
318
319         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
320         if (!event)
321                 return -ENOMEM;
322
323         strcpy(event->device_class, device_class);
324         strcpy(event->bus_id, bus_id);
325         event->type = type;
326         event->data = data;
327
328         spin_lock_irqsave(&acpi_bus_event_lock, flags);
329         list_add_tail(&event->node, &acpi_bus_event_list);
330         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
331
332         wake_up_interruptible(&acpi_bus_event_queue);
333
334         return 0;
335
336 }
337
338 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
339
340 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
341 {
342         if (!device)
343                 return -EINVAL;
344         return acpi_bus_generate_proc_event4(device->pnp.device_class,
345                                              device->pnp.bus_id, type, data);
346 }
347
348 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
349
350 int acpi_bus_receive_event(struct acpi_bus_event *event)
351 {
352         unsigned long flags = 0;
353         struct acpi_bus_event *entry = NULL;
354
355         DECLARE_WAITQUEUE(wait, current);
356
357
358         if (!event)
359                 return -EINVAL;
360
361         if (list_empty(&acpi_bus_event_list)) {
362
363                 set_current_state(TASK_INTERRUPTIBLE);
364                 add_wait_queue(&acpi_bus_event_queue, &wait);
365
366                 if (list_empty(&acpi_bus_event_list))
367                         schedule();
368
369                 remove_wait_queue(&acpi_bus_event_queue, &wait);
370                 set_current_state(TASK_RUNNING);
371
372                 if (signal_pending(current))
373                         return -ERESTARTSYS;
374         }
375
376         spin_lock_irqsave(&acpi_bus_event_lock, flags);
377         if (!list_empty(&acpi_bus_event_list)) {
378                 entry = list_entry(acpi_bus_event_list.next,
379                                    struct acpi_bus_event, node);
380                 list_del(&entry->node);
381         }
382         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
383
384         if (!entry)
385                 return -ENODEV;
386
387         memcpy(event, entry, sizeof(struct acpi_bus_event));
388
389         kfree(entry);
390
391         return 0;
392 }
393
394 #endif  /* CONFIG_ACPI_PROC_EVENT */
395
396 /* --------------------------------------------------------------------------
397                              Notification Handling
398    -------------------------------------------------------------------------- */
399
400 static int
401 acpi_bus_check_device(struct acpi_device *device, int *status_changed)
402 {
403         acpi_status status = 0;
404         struct acpi_device_status old_status;
405
406
407         if (!device)
408                 return -EINVAL;
409
410         if (status_changed)
411                 *status_changed = 0;
412
413         old_status = device->status;
414
415         /*
416          * Make sure this device's parent is present before we go about
417          * messing with the device.
418          */
419         if (device->parent && !device->parent->status.present) {
420                 device->status = device->parent->status;
421                 if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
422                         if (status_changed)
423                                 *status_changed = 1;
424                 }
425                 return 0;
426         }
427
428         status = acpi_bus_get_status(device);
429         if (ACPI_FAILURE(status))
430                 return -ENODEV;
431
432         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
433                 return 0;
434
435         if (status_changed)
436                 *status_changed = 1;
437
438         /*
439          * Device Insertion/Removal
440          */
441         if ((device->status.present) && !(old_status.present)) {
442                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
443                 /* TBD: Handle device insertion */
444         } else if (!(device->status.present) && (old_status.present)) {
445                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
446                 /* TBD: Handle device removal */
447         }
448
449         return 0;
450 }
451
452 static int acpi_bus_check_scope(struct acpi_device *device)
453 {
454         int result = 0;
455         int status_changed = 0;
456
457
458         if (!device)
459                 return -EINVAL;
460
461         /* Status Change? */
462         result = acpi_bus_check_device(device, &status_changed);
463         if (result)
464                 return result;
465
466         if (!status_changed)
467                 return 0;
468
469         /*
470          * TBD: Enumerate child devices within this device's scope and
471          *       run acpi_bus_check_device()'s on them.
472          */
473
474         return 0;
475 }
476
477 /**
478  * acpi_bus_notify
479  * ---------------
480  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
481  */
482 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
483 {
484         int result = 0;
485         struct acpi_device *device = NULL;
486
487
488         if (acpi_bus_get_device(handle, &device))
489                 return;
490
491         switch (type) {
492
493         case ACPI_NOTIFY_BUS_CHECK:
494                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
495                                   "Received BUS CHECK notification for device [%s]\n",
496                                   device->pnp.bus_id));
497                 result = acpi_bus_check_scope(device);
498                 /*
499                  * TBD: We'll need to outsource certain events to non-ACPI
500                  *      drivers via the device manager (device.c).
501                  */
502                 break;
503
504         case ACPI_NOTIFY_DEVICE_CHECK:
505                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
506                                   "Received DEVICE CHECK notification for device [%s]\n",
507                                   device->pnp.bus_id));
508                 result = acpi_bus_check_device(device, NULL);
509                 /*
510                  * TBD: We'll need to outsource certain events to non-ACPI
511                  *      drivers via the device manager (device.c).
512                  */
513                 break;
514
515         case ACPI_NOTIFY_DEVICE_WAKE:
516                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
517                                   "Received DEVICE WAKE notification for device [%s]\n",
518                                   device->pnp.bus_id));
519                 /* TBD */
520                 break;
521
522         case ACPI_NOTIFY_EJECT_REQUEST:
523                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
524                                   "Received EJECT REQUEST notification for device [%s]\n",
525                                   device->pnp.bus_id));
526                 /* TBD */
527                 break;
528
529         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
530                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
531                                   "Received DEVICE CHECK LIGHT notification for device [%s]\n",
532                                   device->pnp.bus_id));
533                 /* TBD: Exactly what does 'light' mean? */
534                 break;
535
536         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
537                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
538                                   "Received FREQUENCY MISMATCH notification for device [%s]\n",
539                                   device->pnp.bus_id));
540                 /* TBD */
541                 break;
542
543         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
544                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
545                                   "Received BUS MODE MISMATCH notification for device [%s]\n",
546                                   device->pnp.bus_id));
547                 /* TBD */
548                 break;
549
550         case ACPI_NOTIFY_POWER_FAULT:
551                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
552                                   "Received POWER FAULT notification for device [%s]\n",
553                                   device->pnp.bus_id));
554                 /* TBD */
555                 break;
556
557         default:
558                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
559                                   "Received unknown/unsupported notification [%08x]\n",
560                                   type));
561                 break;
562         }
563
564         return;
565 }
566
567 /* --------------------------------------------------------------------------
568                              Initialization/Cleanup
569    -------------------------------------------------------------------------- */
570
571 static int __init acpi_bus_init_irq(void)
572 {
573         acpi_status status = AE_OK;
574         union acpi_object arg = { ACPI_TYPE_INTEGER };
575         struct acpi_object_list arg_list = { 1, &arg };
576         char *message = NULL;
577
578
579         /*
580          * Let the system know what interrupt model we are using by
581          * evaluating the \_PIC object, if exists.
582          */
583
584         switch (acpi_irq_model) {
585         case ACPI_IRQ_MODEL_PIC:
586                 message = "PIC";
587                 break;
588         case ACPI_IRQ_MODEL_IOAPIC:
589                 message = "IOAPIC";
590                 break;
591         case ACPI_IRQ_MODEL_IOSAPIC:
592                 message = "IOSAPIC";
593                 break;
594         case ACPI_IRQ_MODEL_PLATFORM:
595                 message = "platform specific model";
596                 break;
597         default:
598                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
599                 return -ENODEV;
600         }
601
602         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
603
604         arg.integer.value = acpi_irq_model;
605
606         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
607         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
608                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
609                 return -ENODEV;
610         }
611
612         return 0;
613 }
614
615 acpi_native_uint acpi_gbl_permanent_mmap;
616
617
618 void __init acpi_early_init(void)
619 {
620         acpi_status status = AE_OK;
621
622         if (acpi_disabled)
623                 return;
624
625         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
626
627         /* enable workarounds, unless strict ACPI spec. compliance */
628         if (!acpi_strict)
629                 acpi_gbl_enable_interpreter_slack = TRUE;
630
631         acpi_gbl_permanent_mmap = 1;
632
633         status = acpi_reallocate_root_table();
634         if (ACPI_FAILURE(status)) {
635                 printk(KERN_ERR PREFIX
636                        "Unable to reallocate ACPI tables\n");
637                 goto error0;
638         }
639
640         status = acpi_initialize_subsystem();
641         if (ACPI_FAILURE(status)) {
642                 printk(KERN_ERR PREFIX
643                        "Unable to initialize the ACPI Interpreter\n");
644                 goto error0;
645         }
646
647         status = acpi_load_tables();
648         if (ACPI_FAILURE(status)) {
649                 printk(KERN_ERR PREFIX
650                        "Unable to load the System Description Tables\n");
651                 goto error0;
652         }
653
654 #ifdef CONFIG_X86
655         if (!acpi_ioapic) {
656                 /* compatible (0) means level (3) */
657                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
658                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
659                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
660                 }
661                 /* Set PIC-mode SCI trigger type */
662                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
663                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
664         } else {
665                 /*
666                  * now that acpi_gbl_FADT is initialized,
667                  * update it with result from INT_SRC_OVR parsing
668                  */
669                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
670         }
671 #endif
672
673         status =
674             acpi_enable_subsystem(~
675                                   (ACPI_NO_HARDWARE_INIT |
676                                    ACPI_NO_ACPI_ENABLE));
677         if (ACPI_FAILURE(status)) {
678                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
679                 goto error0;
680         }
681
682         return;
683
684       error0:
685         disable_acpi();
686         return;
687 }
688
689 static int __init acpi_bus_init(void)
690 {
691         int result = 0;
692         acpi_status status = AE_OK;
693         extern acpi_status acpi_os_initialize1(void);
694
695
696         status = acpi_os_initialize1();
697
698         status =
699             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
700         if (ACPI_FAILURE(status)) {
701                 printk(KERN_ERR PREFIX
702                        "Unable to start the ACPI Interpreter\n");
703                 goto error1;
704         }
705
706         if (ACPI_FAILURE(status)) {
707                 printk(KERN_ERR PREFIX
708                        "Unable to initialize ACPI OS objects\n");
709                 goto error1;
710         }
711 #ifdef CONFIG_ACPI_EC
712         /*
713          * ACPI 2.0 requires the EC driver to be loaded and work before
714          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
715          * is called).
716          *
717          * This is accomplished by looking for the ECDT table, and getting
718          * the EC parameters out of that.
719          */
720         status = acpi_ec_ecdt_probe();
721         /* Ignore result. Not having an ECDT is not fatal. */
722 #endif
723
724         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
725         if (ACPI_FAILURE(status)) {
726                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
727                 goto error1;
728         }
729
730         printk(KERN_INFO PREFIX "Interpreter enabled\n");
731
732         /* Initialize sleep structures */
733         acpi_sleep_init();
734
735         /*
736          * Get the system interrupt model and evaluate \_PIC.
737          */
738         result = acpi_bus_init_irq();
739         if (result)
740                 goto error1;
741
742         /*
743          * Register the for all standard device notifications.
744          */
745         status =
746             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
747                                         &acpi_bus_notify, NULL);
748         if (ACPI_FAILURE(status)) {
749                 printk(KERN_ERR PREFIX
750                        "Unable to register for device notifications\n");
751                 goto error1;
752         }
753
754         /*
755          * Create the top ACPI proc directory
756          */
757         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
758
759         return 0;
760
761         /* Mimic structured exception handling */
762       error1:
763         acpi_terminate();
764         return -ENODEV;
765 }
766
767 struct kobject *acpi_kobj;
768
769 static int __init acpi_init(void)
770 {
771         int result = 0;
772
773
774         if (acpi_disabled) {
775                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
776                 return -ENODEV;
777         }
778
779         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
780         if (!acpi_kobj) {
781                 printk(KERN_WARNING "%s: kset create error\n", __func__);
782                 acpi_kobj = NULL;
783         }
784
785         result = acpi_bus_init();
786
787         if (!result) {
788                 pci_mmcfg_late_init();
789                 if (!(pm_flags & PM_APM))
790                         pm_flags |= PM_ACPI;
791                 else {
792                         printk(KERN_INFO PREFIX
793                                "APM is already active, exiting\n");
794                         disable_acpi();
795                         result = -ENODEV;
796                 }
797         } else
798                 disable_acpi();
799
800         return result;
801 }
802
803 subsys_initcall(acpi_init);