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ACPI: disable _OSI(Windows 2009) on Asus K50IJ
[linux-2.6.git] / drivers / acpi / bus.c
1 /*
2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3  *
4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5  *
6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or (at
11  *  your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful, but
14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  *  General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License along
19  *  with this program; if not, write to the Free Software Foundation, Inc.,
20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21  *
22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23  */
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/kernel.h>
29 #include <linux/list.h>
30 #include <linux/sched.h>
31 #include <linux/pm.h>
32 #include <linux/device.h>
33 #include <linux/proc_fs.h>
34 #include <linux/acpi.h>
35 #ifdef CONFIG_X86
36 #include <asm/mpspec.h>
37 #endif
38 #include <linux/pci.h>
39 #include <acpi/acpi_bus.h>
40 #include <acpi/acpi_drivers.h>
41 #include <linux/dmi.h>
42
43 #include "internal.h"
44
45 #define _COMPONENT              ACPI_BUS_COMPONENT
46 ACPI_MODULE_NAME("bus");
47
48 struct acpi_device *acpi_root;
49 struct proc_dir_entry *acpi_root_dir;
50 EXPORT_SYMBOL(acpi_root_dir);
51
52 #define STRUCT_TO_INT(s)        (*((int*)&s))
53
54 static int set_power_nocheck(const struct dmi_system_id *id)
55 {
56         printk(KERN_NOTICE PREFIX "%s detected - "
57                 "disable power check in power transistion\n", id->ident);
58         acpi_power_nocheck = 1;
59         return 0;
60 }
61 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
62         {
63         set_power_nocheck, "HP Pavilion 05", {
64         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
65         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
66         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
67         {},
68 };
69
70
71 /* --------------------------------------------------------------------------
72                                 Device Management
73    -------------------------------------------------------------------------- */
74
75 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
76 {
77         acpi_status status = AE_OK;
78
79
80         if (!device)
81                 return -EINVAL;
82
83         /* TBD: Support fixed-feature devices */
84
85         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
86         if (ACPI_FAILURE(status) || !*device) {
87                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
88                                   handle));
89                 return -ENODEV;
90         }
91
92         return 0;
93 }
94
95 EXPORT_SYMBOL(acpi_bus_get_device);
96
97 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
98                                        unsigned long long *sta)
99 {
100         acpi_status status;
101
102         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
103         if (ACPI_SUCCESS(status))
104                 return AE_OK;
105
106         if (status == AE_NOT_FOUND) {
107                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
108                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
109                 return AE_OK;
110         }
111         return status;
112 }
113
114 int acpi_bus_get_status(struct acpi_device *device)
115 {
116         acpi_status status;
117         unsigned long long sta;
118
119         status = acpi_bus_get_status_handle(device->handle, &sta);
120         if (ACPI_FAILURE(status))
121                 return -ENODEV;
122
123         STRUCT_TO_INT(device->status) = (int) sta;
124
125         if (device->status.functional && !device->status.present) {
126                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
127                        "functional but not present;\n",
128                         device->pnp.bus_id,
129                         (u32) STRUCT_TO_INT(device->status)));
130         }
131
132         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
133                           device->pnp.bus_id,
134                           (u32) STRUCT_TO_INT(device->status)));
135         return 0;
136 }
137 EXPORT_SYMBOL(acpi_bus_get_status);
138
139 void acpi_bus_private_data_handler(acpi_handle handle,
140                                    void *context)
141 {
142         return;
143 }
144 EXPORT_SYMBOL(acpi_bus_private_data_handler);
145
146 int acpi_bus_get_private_data(acpi_handle handle, void **data)
147 {
148         acpi_status status = AE_OK;
149
150         if (!*data)
151                 return -EINVAL;
152
153         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
154         if (ACPI_FAILURE(status) || !*data) {
155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
156                                 handle));
157                 return -ENODEV;
158         }
159
160         return 0;
161 }
162 EXPORT_SYMBOL(acpi_bus_get_private_data);
163
164 /* --------------------------------------------------------------------------
165                                  Power Management
166    -------------------------------------------------------------------------- */
167
168 int acpi_bus_get_power(acpi_handle handle, int *state)
169 {
170         int result = 0;
171         acpi_status status = 0;
172         struct acpi_device *device = NULL;
173         unsigned long long psc = 0;
174
175
176         result = acpi_bus_get_device(handle, &device);
177         if (result)
178                 return result;
179
180         *state = ACPI_STATE_UNKNOWN;
181
182         if (!device->flags.power_manageable) {
183                 /* TBD: Non-recursive algorithm for walking up hierarchy */
184                 if (device->parent)
185                         *state = device->parent->power.state;
186                 else
187                         *state = ACPI_STATE_D0;
188         } else {
189                 /*
190                  * Get the device's power state either directly (via _PSC) or
191                  * indirectly (via power resources).
192                  */
193                 if (device->power.flags.explicit_get) {
194                         status = acpi_evaluate_integer(device->handle, "_PSC",
195                                                        NULL, &psc);
196                         if (ACPI_FAILURE(status))
197                                 return -ENODEV;
198                         device->power.state = (int)psc;
199                 } else if (device->power.flags.power_resources) {
200                         result = acpi_power_get_inferred_state(device);
201                         if (result)
202                                 return result;
203                 }
204
205                 *state = device->power.state;
206         }
207
208         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
209                           device->pnp.bus_id, device->power.state));
210
211         return 0;
212 }
213
214 EXPORT_SYMBOL(acpi_bus_get_power);
215
216 int acpi_bus_set_power(acpi_handle handle, int state)
217 {
218         int result = 0;
219         acpi_status status = AE_OK;
220         struct acpi_device *device = NULL;
221         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
222
223
224         result = acpi_bus_get_device(handle, &device);
225         if (result)
226                 return result;
227
228         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
229                 return -EINVAL;
230
231         /* Make sure this is a valid target state */
232
233         if (!device->flags.power_manageable) {
234                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
235                                 kobject_name(&device->dev.kobj)));
236                 return -ENODEV;
237         }
238         /*
239          * Get device's current power state
240          */
241         if (!acpi_power_nocheck) {
242                 /*
243                  * Maybe the incorrect power state is returned on the bogus
244                  * bios, which is different with the real power state.
245                  * For example: the bios returns D0 state and the real power
246                  * state is D3. OS expects to set the device to D0 state. In
247                  * such case if OS uses the power state returned by the BIOS,
248                  * the device can't be transisted to the correct power state.
249                  * So if the acpi_power_nocheck is set, it is unnecessary to
250                  * get the power state by calling acpi_bus_get_power.
251                  */
252                 acpi_bus_get_power(device->handle, &device->power.state);
253         }
254         if ((state == device->power.state) && !device->flags.force_power_state) {
255                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
256                                   state));
257                 return 0;
258         }
259
260         if (!device->power.states[state].flags.valid) {
261                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
262                 return -ENODEV;
263         }
264         if (device->parent && (state < device->parent->power.state)) {
265                 printk(KERN_WARNING PREFIX
266                               "Cannot set device to a higher-powered"
267                               " state than parent\n");
268                 return -ENODEV;
269         }
270
271         /*
272          * Transition Power
273          * ----------------
274          * On transitions to a high-powered state we first apply power (via
275          * power resources) then evalute _PSx.  Conversly for transitions to
276          * a lower-powered state.
277          */
278         if (state < device->power.state) {
279                 if (device->power.flags.power_resources) {
280                         result = acpi_power_transition(device, state);
281                         if (result)
282                                 goto end;
283                 }
284                 if (device->power.states[state].flags.explicit_set) {
285                         status = acpi_evaluate_object(device->handle,
286                                                       object_name, NULL, NULL);
287                         if (ACPI_FAILURE(status)) {
288                                 result = -ENODEV;
289                                 goto end;
290                         }
291                 }
292         } else {
293                 if (device->power.states[state].flags.explicit_set) {
294                         status = acpi_evaluate_object(device->handle,
295                                                       object_name, NULL, NULL);
296                         if (ACPI_FAILURE(status)) {
297                                 result = -ENODEV;
298                                 goto end;
299                         }
300                 }
301                 if (device->power.flags.power_resources) {
302                         result = acpi_power_transition(device, state);
303                         if (result)
304                                 goto end;
305                 }
306         }
307
308       end:
309         if (result)
310                 printk(KERN_WARNING PREFIX
311                               "Device [%s] failed to transition to D%d\n",
312                               device->pnp.bus_id, state);
313         else {
314                 device->power.state = state;
315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316                                   "Device [%s] transitioned to D%d\n",
317                                   device->pnp.bus_id, state));
318         }
319
320         return result;
321 }
322
323 EXPORT_SYMBOL(acpi_bus_set_power);
324
325 bool acpi_bus_power_manageable(acpi_handle handle)
326 {
327         struct acpi_device *device;
328         int result;
329
330         result = acpi_bus_get_device(handle, &device);
331         return result ? false : device->flags.power_manageable;
332 }
333
334 EXPORT_SYMBOL(acpi_bus_power_manageable);
335
336 bool acpi_bus_can_wakeup(acpi_handle handle)
337 {
338         struct acpi_device *device;
339         int result;
340
341         result = acpi_bus_get_device(handle, &device);
342         return result ? false : device->wakeup.flags.valid;
343 }
344
345 EXPORT_SYMBOL(acpi_bus_can_wakeup);
346
347 /* --------------------------------------------------------------------------
348                                 Event Management
349    -------------------------------------------------------------------------- */
350
351 #ifdef CONFIG_ACPI_PROC_EVENT
352 static DEFINE_SPINLOCK(acpi_bus_event_lock);
353
354 LIST_HEAD(acpi_bus_event_list);
355 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
356
357 extern int event_is_open;
358
359 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
360 {
361         struct acpi_bus_event *event;
362         unsigned long flags = 0;
363
364         /* drop event on the floor if no one's listening */
365         if (!event_is_open)
366                 return 0;
367
368         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
369         if (!event)
370                 return -ENOMEM;
371
372         strcpy(event->device_class, device_class);
373         strcpy(event->bus_id, bus_id);
374         event->type = type;
375         event->data = data;
376
377         spin_lock_irqsave(&acpi_bus_event_lock, flags);
378         list_add_tail(&event->node, &acpi_bus_event_list);
379         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
380
381         wake_up_interruptible(&acpi_bus_event_queue);
382
383         return 0;
384
385 }
386
387 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
388
389 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
390 {
391         if (!device)
392                 return -EINVAL;
393         return acpi_bus_generate_proc_event4(device->pnp.device_class,
394                                              device->pnp.bus_id, type, data);
395 }
396
397 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
398
399 int acpi_bus_receive_event(struct acpi_bus_event *event)
400 {
401         unsigned long flags = 0;
402         struct acpi_bus_event *entry = NULL;
403
404         DECLARE_WAITQUEUE(wait, current);
405
406
407         if (!event)
408                 return -EINVAL;
409
410         if (list_empty(&acpi_bus_event_list)) {
411
412                 set_current_state(TASK_INTERRUPTIBLE);
413                 add_wait_queue(&acpi_bus_event_queue, &wait);
414
415                 if (list_empty(&acpi_bus_event_list))
416                         schedule();
417
418                 remove_wait_queue(&acpi_bus_event_queue, &wait);
419                 set_current_state(TASK_RUNNING);
420
421                 if (signal_pending(current))
422                         return -ERESTARTSYS;
423         }
424
425         spin_lock_irqsave(&acpi_bus_event_lock, flags);
426         if (!list_empty(&acpi_bus_event_list)) {
427                 entry = list_entry(acpi_bus_event_list.next,
428                                    struct acpi_bus_event, node);
429                 list_del(&entry->node);
430         }
431         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
432
433         if (!entry)
434                 return -ENODEV;
435
436         memcpy(event, entry, sizeof(struct acpi_bus_event));
437
438         kfree(entry);
439
440         return 0;
441 }
442
443 #endif  /* CONFIG_ACPI_PROC_EVENT */
444
445 /* --------------------------------------------------------------------------
446                              Notification Handling
447    -------------------------------------------------------------------------- */
448
449 static void acpi_bus_check_device(acpi_handle handle)
450 {
451         struct acpi_device *device;
452         acpi_status status;
453         struct acpi_device_status old_status;
454
455         if (acpi_bus_get_device(handle, &device))
456                 return;
457         if (!device)
458                 return;
459
460         old_status = device->status;
461
462         /*
463          * Make sure this device's parent is present before we go about
464          * messing with the device.
465          */
466         if (device->parent && !device->parent->status.present) {
467                 device->status = device->parent->status;
468                 return;
469         }
470
471         status = acpi_bus_get_status(device);
472         if (ACPI_FAILURE(status))
473                 return;
474
475         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
476                 return;
477
478         /*
479          * Device Insertion/Removal
480          */
481         if ((device->status.present) && !(old_status.present)) {
482                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
483                 /* TBD: Handle device insertion */
484         } else if (!(device->status.present) && (old_status.present)) {
485                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
486                 /* TBD: Handle device removal */
487         }
488 }
489
490 static void acpi_bus_check_scope(acpi_handle handle)
491 {
492         /* Status Change? */
493         acpi_bus_check_device(handle);
494
495         /*
496          * TBD: Enumerate child devices within this device's scope and
497          *       run acpi_bus_check_device()'s on them.
498          */
499 }
500
501 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
502 int register_acpi_bus_notifier(struct notifier_block *nb)
503 {
504         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
505 }
506 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
507
508 void unregister_acpi_bus_notifier(struct notifier_block *nb)
509 {
510         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
511 }
512 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
513
514 /**
515  * acpi_bus_notify
516  * ---------------
517  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
518  */
519 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
520 {
521         struct acpi_device *device = NULL;
522         struct acpi_driver *driver;
523
524         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
525                           type, handle));
526
527         blocking_notifier_call_chain(&acpi_bus_notify_list,
528                 type, (void *)handle);
529
530         switch (type) {
531
532         case ACPI_NOTIFY_BUS_CHECK:
533                 acpi_bus_check_scope(handle);
534                 /*
535                  * TBD: We'll need to outsource certain events to non-ACPI
536                  *      drivers via the device manager (device.c).
537                  */
538                 break;
539
540         case ACPI_NOTIFY_DEVICE_CHECK:
541                 acpi_bus_check_device(handle);
542                 /*
543                  * TBD: We'll need to outsource certain events to non-ACPI
544                  *      drivers via the device manager (device.c).
545                  */
546                 break;
547
548         case ACPI_NOTIFY_DEVICE_WAKE:
549                 /* TBD */
550                 break;
551
552         case ACPI_NOTIFY_EJECT_REQUEST:
553                 /* TBD */
554                 break;
555
556         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
557                 /* TBD: Exactly what does 'light' mean? */
558                 break;
559
560         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
561                 /* TBD */
562                 break;
563
564         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
565                 /* TBD */
566                 break;
567
568         case ACPI_NOTIFY_POWER_FAULT:
569                 /* TBD */
570                 break;
571
572         default:
573                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
574                                   "Received unknown/unsupported notification [%08x]\n",
575                                   type));
576                 break;
577         }
578
579         acpi_bus_get_device(handle, &device);
580         if (device) {
581                 driver = device->driver;
582                 if (driver && driver->ops.notify &&
583                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
584                         driver->ops.notify(device, type);
585         }
586 }
587
588 /* --------------------------------------------------------------------------
589                              Initialization/Cleanup
590    -------------------------------------------------------------------------- */
591
592 static int __init acpi_bus_init_irq(void)
593 {
594         acpi_status status = AE_OK;
595         union acpi_object arg = { ACPI_TYPE_INTEGER };
596         struct acpi_object_list arg_list = { 1, &arg };
597         char *message = NULL;
598
599
600         /*
601          * Let the system know what interrupt model we are using by
602          * evaluating the \_PIC object, if exists.
603          */
604
605         switch (acpi_irq_model) {
606         case ACPI_IRQ_MODEL_PIC:
607                 message = "PIC";
608                 break;
609         case ACPI_IRQ_MODEL_IOAPIC:
610                 message = "IOAPIC";
611                 break;
612         case ACPI_IRQ_MODEL_IOSAPIC:
613                 message = "IOSAPIC";
614                 break;
615         case ACPI_IRQ_MODEL_PLATFORM:
616                 message = "platform specific model";
617                 break;
618         default:
619                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
620                 return -ENODEV;
621         }
622
623         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
624
625         arg.integer.value = acpi_irq_model;
626
627         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
628         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
629                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
630                 return -ENODEV;
631         }
632
633         return 0;
634 }
635
636 u8 acpi_gbl_permanent_mmap;
637
638
639 void __init acpi_early_init(void)
640 {
641         acpi_status status = AE_OK;
642
643         if (acpi_disabled)
644                 return;
645
646         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
647
648         /* enable workarounds, unless strict ACPI spec. compliance */
649         if (!acpi_strict)
650                 acpi_gbl_enable_interpreter_slack = TRUE;
651
652         acpi_gbl_permanent_mmap = 1;
653
654         status = acpi_reallocate_root_table();
655         if (ACPI_FAILURE(status)) {
656                 printk(KERN_ERR PREFIX
657                        "Unable to reallocate ACPI tables\n");
658                 goto error0;
659         }
660
661         status = acpi_initialize_subsystem();
662         if (ACPI_FAILURE(status)) {
663                 printk(KERN_ERR PREFIX
664                        "Unable to initialize the ACPI Interpreter\n");
665                 goto error0;
666         }
667
668         status = acpi_load_tables();
669         if (ACPI_FAILURE(status)) {
670                 printk(KERN_ERR PREFIX
671                        "Unable to load the System Description Tables\n");
672                 goto error0;
673         }
674
675 #ifdef CONFIG_X86
676         if (!acpi_ioapic) {
677                 /* compatible (0) means level (3) */
678                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
679                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
680                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
681                 }
682                 /* Set PIC-mode SCI trigger type */
683                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
684                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
685         } else {
686                 /*
687                  * now that acpi_gbl_FADT is initialized,
688                  * update it with result from INT_SRC_OVR parsing
689                  */
690                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
691         }
692 #endif
693
694         status =
695             acpi_enable_subsystem(~
696                                   (ACPI_NO_HARDWARE_INIT |
697                                    ACPI_NO_ACPI_ENABLE));
698         if (ACPI_FAILURE(status)) {
699                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
700                 goto error0;
701         }
702
703         return;
704
705       error0:
706         disable_acpi();
707         return;
708 }
709
710 static int __init acpi_bus_init(void)
711 {
712         int result = 0;
713         acpi_status status = AE_OK;
714         extern acpi_status acpi_os_initialize1(void);
715
716         acpi_os_initialize1();
717
718         status =
719             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
720         if (ACPI_FAILURE(status)) {
721                 printk(KERN_ERR PREFIX
722                        "Unable to start the ACPI Interpreter\n");
723                 goto error1;
724         }
725
726         /*
727          * ACPI 2.0 requires the EC driver to be loaded and work before
728          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
729          * is called).
730          *
731          * This is accomplished by looking for the ECDT table, and getting
732          * the EC parameters out of that.
733          */
734         status = acpi_ec_ecdt_probe();
735         /* Ignore result. Not having an ECDT is not fatal. */
736
737         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
738         if (ACPI_FAILURE(status)) {
739                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
740                 goto error1;
741         }
742
743         /*
744          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
745          * is necessary to enable it as early as possible.
746          */
747         acpi_boot_ec_enable();
748
749         printk(KERN_INFO PREFIX "Interpreter enabled\n");
750
751         /* Initialize sleep structures */
752         acpi_sleep_init();
753
754         /*
755          * Get the system interrupt model and evaluate \_PIC.
756          */
757         result = acpi_bus_init_irq();
758         if (result)
759                 goto error1;
760
761         /*
762          * Register the for all standard device notifications.
763          */
764         status =
765             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
766                                         &acpi_bus_notify, NULL);
767         if (ACPI_FAILURE(status)) {
768                 printk(KERN_ERR PREFIX
769                        "Unable to register for device notifications\n");
770                 goto error1;
771         }
772
773         /*
774          * Create the top ACPI proc directory
775          */
776         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
777
778         return 0;
779
780         /* Mimic structured exception handling */
781       error1:
782         acpi_terminate();
783         return -ENODEV;
784 }
785
786 struct kobject *acpi_kobj;
787
788 static int __init acpi_init(void)
789 {
790         int result = 0;
791
792
793         if (acpi_disabled) {
794                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
795                 return -ENODEV;
796         }
797
798         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
799         if (!acpi_kobj) {
800                 printk(KERN_WARNING "%s: kset create error\n", __func__);
801                 acpi_kobj = NULL;
802         }
803
804         init_acpi_device_notify();
805         result = acpi_bus_init();
806
807         if (!result) {
808                 pci_mmcfg_late_init();
809                 if (!(pm_flags & PM_APM))
810                         pm_flags |= PM_ACPI;
811                 else {
812                         printk(KERN_INFO PREFIX
813                                "APM is already active, exiting\n");
814                         disable_acpi();
815                         result = -ENODEV;
816                 }
817         } else
818                 disable_acpi();
819
820         if (acpi_disabled)
821                 return result;
822
823         /*
824          * If the laptop falls into the DMI check table, the power state check
825          * will be disabled in the course of device power transistion.
826          */
827         dmi_check_system(power_nocheck_dmi_table);
828
829         acpi_scan_init();
830         acpi_ec_init();
831         acpi_power_init();
832         acpi_system_init();
833         acpi_debug_init();
834         acpi_sleep_proc_init();
835         acpi_wakeup_device_init();
836         return result;
837 }
838
839 subsys_initcall(acpi_init);