aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/bus.c
blob: 7edf6d913c1318fded1fd4cf6a448b2f799a0849 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
/*
 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/proc_fs.h>
#include <linux/acpi.h>
#ifdef CONFIG_X86
#include <asm/mpspec.h>
#endif
#include <linux/pci.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("bus");

struct acpi_device *acpi_root;
struct proc_dir_entry *acpi_root_dir;
EXPORT_SYMBOL(acpi_root_dir);

#define STRUCT_TO_INT(s)	(*((int*)&s))

static int set_power_nocheck(const struct dmi_system_id *id)
{
	printk(KERN_NOTICE PREFIX "%s detected - "
		"disable power check in power transistion\n", id->ident);
	acpi_power_nocheck = 1;
	return 0;
}
static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
	{
	set_power_nocheck, "HP Pavilion 05", {
	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
	DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
	{},
};


/* --------------------------------------------------------------------------
                                Device Management
   -------------------------------------------------------------------------- */

int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
{
	acpi_status status = AE_OK;


	if (!device)
		return -EINVAL;

	/* TBD: Support fixed-feature devices */

	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
	if (ACPI_FAILURE(status) || !*device) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
				  handle));
		return -ENODEV;
	}

	return 0;
}

EXPORT_SYMBOL(acpi_bus_get_device);

int acpi_bus_get_status(struct acpi_device *device)
{
	acpi_status status = AE_OK;
	unsigned long long sta = 0;


	if (!device)
		return -EINVAL;

	/*
	 * Evaluate _STA if present.
	 */
	if (device->flags.dynamic_status) {
		status =
		    acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
		if (ACPI_FAILURE(status))
			return -ENODEV;
		STRUCT_TO_INT(device->status) = (int)sta;
	}

	/*
	 * According to ACPI spec some device can be present and functional
	 * even if the parent is not present but functional.
	 * In such conditions the child device should not inherit the status
	 * from the parent.
	 */
	else
		STRUCT_TO_INT(device->status) =
		    ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
		    ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;

	if (device->status.functional && !device->status.present) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
		       "functional but not present;\n",
			device->pnp.bus_id,
			(u32) STRUCT_TO_INT(device->status)));
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
			  device->pnp.bus_id,
			  (u32) STRUCT_TO_INT(device->status)));

	return 0;
}

EXPORT_SYMBOL(acpi_bus_get_status);

void acpi_bus_private_data_handler(acpi_handle handle,
				   u32 function, void *context)
{
	return;
}
EXPORT_SYMBOL(acpi_bus_private_data_handler);

int acpi_bus_get_private_data(acpi_handle handle, void **data)
{
	acpi_status status = AE_OK;

	if (!*data)
		return -EINVAL;

	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
	if (ACPI_FAILURE(status) || !*data) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
				handle));
		return -ENODEV;
	}

	return 0;
}
EXPORT_SYMBOL(acpi_bus_get_private_data);

/* --------------------------------------------------------------------------
                                 Power Management
   -------------------------------------------------------------------------- */

int acpi_bus_get_power(acpi_handle handle, int *state)
{
	int result = 0;
	acpi_status status = 0;
	struct acpi_device *device = NULL;
	unsigned long long psc = 0;


	result = acpi_bus_get_device(handle, &device);
	if (result)
		return result;

	*state = ACPI_STATE_UNKNOWN;

	if (!device->flags.power_manageable) {
		/* TBD: Non-recursive algorithm for walking up hierarchy */
		if (device->parent)
			*state = device->parent->power.state;
		else
			*state = ACPI_STATE_D0;
	} else {
		/*
		 * Get the device's power state either directly (via _PSC) or
		 * indirectly (via power resources).
		 */
		if (device->power.flags.explicit_get) {
			status = acpi_evaluate_integer(device->handle, "_PSC",
						       NULL, &psc);
			if (ACPI_FAILURE(status))
				return -ENODEV;
			device->power.state = (int)psc;
		} else if (device->power.flags.power_resources) {
			result = acpi_power_get_inferred_state(device);
			if (result)
				return result;
		}

		*state = device->power.state;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
			  device->pnp.bus_id, device->power.state));

	return 0;
}

EXPORT_SYMBOL(acpi_bus_get_power);

int acpi_bus_set_power(acpi_handle handle, int state)
{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_device *device = NULL;
	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };


	result = acpi_bus_get_device(handle, &device);
	if (result)
		return result;

	if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
		return -EINVAL;

	/* Make sure this is a valid target state */

	if (!device->flags.power_manageable) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
				kobject_name(&device->dev.kobj)));
		return -ENODEV;
	}
	/*
	 * Get device's current power state
	 */
	if (!acpi_power_nocheck) {
		/*
		 * Maybe the incorrect power state is returned on the bogus
		 * bios, which is different with the real power state.
		 * For example: the bios returns D0 state and the real power
		 * state is D3. OS expects to set the device to D0 state. In
		 * such case if OS uses the power state returned by the BIOS,
		 * the device can't be transisted to the correct power state.
		 * So if the acpi_power_nocheck is set, it is unnecessary to
		 * get the power state by calling acpi_bus_get_power.
		 */
		acpi_bus_get_power(device->handle, &device->power.state);
	}
	if ((state == device->power.state) && !device->flags.force_power_state) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
				  state));
		return 0;
	}

	if (!device->power.states[state].flags.valid) {
		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
		return -ENODEV;
	}
	if (device->parent && (state < device->parent->power.state)) {
		printk(KERN_WARNING PREFIX
			      "Cannot set device to a higher-powered"
			      " state than parent\n");
		return -ENODEV;
	}

	/*
	 * Transition Power
	 * ----------------
	 * On transitions to a high-powered state we first apply power (via
	 * power resources) then evalute _PSx.  Conversly for transitions to
	 * a lower-powered state.
	 */
	if (state < device->power.state) {
		if (device->power.flags.power_resources) {
			result = acpi_power_transition(device, state);
			if (result)
				goto end;
		}
		if (device->power.states[state].flags.explicit_set) {
			status = acpi_evaluate_object(device->handle,
						      object_name, NULL, NULL);
			if (ACPI_FAILURE(status)) {
				result = -ENODEV;
				goto end;
			}
		}
	} else {
		if (device->power.states[state].flags.explicit_set) {
			status = acpi_evaluate_object(device->handle,
						      object_name, NULL, NULL);
			if (ACPI_FAILURE(status)) {
				result = -ENODEV;
				goto end;
			}
		}
		if (device->power.flags.power_resources) {
			result = acpi_power_transition(device, state);
			if (result)
				goto end;
		}
	}

      end:
	if (result)
		printk(KERN_WARNING PREFIX
			      "Transitioning device [%s] to D%d\n",
			      device->pnp.bus_id, state);
	else {
		device->power.state = state;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Device [%s] transitioned to D%d\n",
				  device->pnp.bus_id, state));
	}

	return result;
}

EXPORT_SYMBOL(acpi_bus_set_power);

bool acpi_bus_power_manageable(acpi_handle handle)
{
	struct acpi_device *device;
	int result;

	result = acpi_bus_get_device(handle, &device);
	return result ? false : device->flags.power_manageable;
}

EXPORT_SYMBOL(acpi_bus_power_manageable);

bool acpi_bus_can_wakeup(acpi_handle handle)
{
	struct acpi_device *device;
	int result;

	result = acpi_bus_get_device(handle, &device);
	return result ? false : device->wakeup.flags.valid;
}

EXPORT_SYMBOL(acpi_bus_can_wakeup);

/* --------------------------------------------------------------------------
                                Event Management
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PROC_EVENT
static DEFINE_SPINLOCK(acpi_bus_event_lock);

LIST_HEAD(acpi_bus_event_list);
DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);

extern int event_is_open;

int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
{
	struct acpi_bus_event *event;
	unsigned long flags = 0;

	/* drop event on the floor if no one's listening */
	if (!event_is_open)
		return 0;

	event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
	if (!event)
		return -ENOMEM;

	strcpy(event->device_class, device_class);
	strcpy(event->bus_id, bus_id);
	event->type = type;
	event->data = data;

	spin_lock_irqsave(&acpi_bus_event_lock, flags);
	list_add_tail(&event->node, &acpi_bus_event_list);
	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);

	wake_up_interruptible(&acpi_bus_event_queue);

	return 0;

}

EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);

int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
{
	if (!device)
		return -EINVAL;
	return acpi_bus_generate_proc_event4(device->pnp.device_class,
					     device->pnp.bus_id, type, data);
}

EXPORT_SYMBOL(acpi_bus_generate_proc_event);

int acpi_bus_receive_event(struct acpi_bus_event *event)
{
	unsigned long flags = 0;
	struct acpi_bus_event *entry = NULL;

	DECLARE_WAITQUEUE(wait, current);


	if (!event)
		return -EINVAL;

	if (list_empty(&acpi_bus_event_list)) {

		set_current_state(TASK_INTERRUPTIBLE);
		add_wait_queue(&acpi_bus_event_queue, &wait);

		if (list_empty(&acpi_bus_event_list))
			schedule();

		remove_wait_queue(&acpi_bus_event_queue, &wait);
		set_current_state(TASK_RUNNING);

		if (signal_pending(current))
			return -ERESTARTSYS;
	}

	spin_lock_irqsave(&acpi_bus_event_lock, flags);
	if (!list_empty(&acpi_bus_event_list)) {
		entry = list_entry(acpi_bus_event_list.next,
				   struct acpi_bus_event, node);
		list_del(&entry->node);
	}
	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);

	if (!entry)
		return -ENODEV;

	memcpy(event, entry, sizeof(struct acpi_bus_event));

	kfree(entry);

	return 0;
}

#endif	/* CONFIG_ACPI_PROC_EVENT */

/* --------------------------------------------------------------------------
                             Notification Handling
   -------------------------------------------------------------------------- */

static int
acpi_bus_check_device(struct acpi_device *device, int *status_changed)
{
	acpi_status status = 0;
	struct acpi_device_status old_status;


	if (!device)
		return -EINVAL;

	if (status_changed)
		*status_changed = 0;

	old_status = device->status;

	/*
	 * Make sure this device's parent is present before we go about
	 * messing with the device.
	 */
	if (device->parent && !device->parent->status.present) {
		device->status = device->parent->status;
		if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
			if (status_changed)
				*status_changed = 1;
		}
		return 0;
	}

	status = acpi_bus_get_status(device);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
		return 0;

	if (status_changed)
		*status_changed = 1;

	/*
	 * Device Insertion/Removal
	 */
	if ((device->status.present) && !(old_status.present)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
		/* TBD: Handle device insertion */
	} else if (!(device->status.present) && (old_status.present)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
		/* TBD: Handle device removal */
	}

	return 0;
}

static int acpi_bus_check_scope(struct acpi_device *device)
{
	int result = 0;
	int status_changed = 0;


	if (!device)
		return -EINVAL;

	/* Status Change? */
	result = acpi_bus_check_device(device, &status_changed);
	if (result)
		return result;

	if (!status_changed)
		return 0;

	/*
	 * TBD: Enumerate child devices within this device's scope and
	 *       run acpi_bus_check_device()'s on them.
	 */

	return 0;
}

static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
int register_acpi_bus_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
}
EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);

void unregister_acpi_bus_notifier(struct notifier_block *nb)
{
	blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
}
EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);

/**
 * acpi_bus_notify
 * ---------------
 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 */
static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
{
	int result = 0;
	struct acpi_device *device = NULL;

	blocking_notifier_call_chain(&acpi_bus_notify_list,
		type, (void *)handle);

	if (acpi_bus_get_device(handle, &device))
		return;

	switch (type) {

	case ACPI_NOTIFY_BUS_CHECK:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received BUS CHECK notification for device [%s]\n",
				  device->pnp.bus_id));
		result = acpi_bus_check_scope(device);
		/*
		 * TBD: We'll need to outsource certain events to non-ACPI
		 *      drivers via the device manager (device.c).
		 */
		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received DEVICE CHECK notification for device [%s]\n",
				  device->pnp.bus_id));
		result = acpi_bus_check_device(device, NULL);
		/*
		 * TBD: We'll need to outsource certain events to non-ACPI
		 *      drivers via the device manager (device.c).
		 */
		break;

	case ACPI_NOTIFY_DEVICE_WAKE:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received DEVICE WAKE notification for device [%s]\n",
				  device->pnp.bus_id));
		/* TBD */
		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received EJECT REQUEST notification for device [%s]\n",
				  device->pnp.bus_id));
		/* TBD */
		break;

	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received DEVICE CHECK LIGHT notification for device [%s]\n",
				  device->pnp.bus_id));
		/* TBD: Exactly what does 'light' mean? */
		break;

	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received FREQUENCY MISMATCH notification for device [%s]\n",
				  device->pnp.bus_id));
		/* TBD */
		break;

	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received BUS MODE MISMATCH notification for device [%s]\n",
				  device->pnp.bus_id));
		/* TBD */
		break;

	case ACPI_NOTIFY_POWER_FAULT:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received POWER FAULT notification for device [%s]\n",
				  device->pnp.bus_id));
		/* TBD */
		break;

	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Received unknown/unsupported notification [%08x]\n",
				  type));
		break;
	}

	return;
}

/* --------------------------------------------------------------------------
                             Initialization/Cleanup
   -------------------------------------------------------------------------- */

static int __init acpi_bus_init_irq(void)
{
	acpi_status status = AE_OK;
	union acpi_object arg = { ACPI_TYPE_INTEGER };
	struct acpi_object_list arg_list = { 1, &arg };
	char *message = NULL;


	/*
	 * Let the system know what interrupt model we are using by
	 * evaluating the \_PIC object, if exists.
	 */

	switch (acpi_irq_model) {
	case ACPI_IRQ_MODEL_PIC:
		message = "PIC";
		break;
	case ACPI_IRQ_MODEL_IOAPIC:
		message = "IOAPIC";
		break;
	case ACPI_IRQ_MODEL_IOSAPIC:
		message = "IOSAPIC";
		break;
	case ACPI_IRQ_MODEL_PLATFORM:
		message = "platform specific model";
		break;
	default:
		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
		return -ENODEV;
	}

	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);

	arg.integer.value = acpi_irq_model;

	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
		return -ENODEV;
	}

	return 0;
}

u8 acpi_gbl_permanent_mmap;


void __init acpi_early_init(void)
{
	acpi_status status = AE_OK;

	if (acpi_disabled)
		return;

	/*
	 * ACPI CA initializes acpi_dbg_level to non-zero, which means
	 * we get debug output merely by turning on CONFIG_ACPI_DEBUG.
	 * Turn it off so we don't get output unless the user specifies
	 * acpi.debug_level.
	 */
	acpi_dbg_level = 0;

	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);

	/* enable workarounds, unless strict ACPI spec. compliance */
	if (!acpi_strict)
		acpi_gbl_enable_interpreter_slack = TRUE;

	acpi_gbl_permanent_mmap = 1;

	status = acpi_reallocate_root_table();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to reallocate ACPI tables\n");
		goto error0;
	}

	status = acpi_initialize_subsystem();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to initialize the ACPI Interpreter\n");
		goto error0;
	}

	status = acpi_load_tables();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to load the System Description Tables\n");
		goto error0;
	}

#ifdef CONFIG_X86
	if (!acpi_ioapic) {
		/* compatible (0) means level (3) */
		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
		}
		/* Set PIC-mode SCI trigger type */
		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
	} else {
		/*
		 * now that acpi_gbl_FADT is initialized,
		 * update it with result from INT_SRC_OVR parsing
		 */
		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
	}
#endif

	status =
	    acpi_enable_subsystem(~
				  (ACPI_NO_HARDWARE_INIT |
				   ACPI_NO_ACPI_ENABLE));
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
		goto error0;
	}

	return;

      error0:
	disable_acpi();
	return;
}

static int __init acpi_bus_init(void)
{
	int result = 0;
	acpi_status status = AE_OK;
	extern acpi_status acpi_os_initialize1(void);


	status = acpi_os_initialize1();

	status =
	    acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to start the ACPI Interpreter\n");
		goto error1;
	}

	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to initialize ACPI OS objects\n");
		goto error1;
	}

	/*
	 * ACPI 2.0 requires the EC driver to be loaded and work before
	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
	 * is called).
	 *
	 * This is accomplished by looking for the ECDT table, and getting
	 * the EC parameters out of that.
	 */
	status = acpi_ec_ecdt_probe();
	/* Ignore result. Not having an ECDT is not fatal. */

	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
		goto error1;
	}

	/*
	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
	 * is necessary to enable it as early as possible.
	 */
	acpi_boot_ec_enable();

	printk(KERN_INFO PREFIX "Interpreter enabled\n");

	/* Initialize sleep structures */
	acpi_sleep_init();

	/*
	 * Get the system interrupt model and evaluate \_PIC.
	 */
	result = acpi_bus_init_irq();
	if (result)
		goto error1;

	/*
	 * Register the for all standard device notifications.
	 */
	status =
	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
					&acpi_bus_notify, NULL);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX
		       "Unable to register for device notifications\n");
		goto error1;
	}

	/*
	 * Create the top ACPI proc directory
	 */
	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);

	return 0;

	/* Mimic structured exception handling */
      error1:
	acpi_terminate();
	return -ENODEV;
}

struct kobject *acpi_kobj;

static int __init acpi_init(void)
{
	int result = 0;


	if (acpi_disabled) {
		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
		return -ENODEV;
	}

	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
	if (!acpi_kobj) {
		printk(KERN_WARNING "%s: kset create error\n", __func__);
		acpi_kobj = NULL;
	}

	result = acpi_bus_init();

	if (!result) {
		pci_mmcfg_late_init();
		if (!(pm_flags & PM_APM))
			pm_flags |= PM_ACPI;
		else {
			printk(KERN_INFO PREFIX
			       "APM is already active, exiting\n");
			disable_acpi();
			result = -ENODEV;
		}
	} else
		disable_acpi();
	/*
	 * If the laptop falls into the DMI check table, the power state check
	 * will be disabled in the course of device power transistion.
	 */
	dmi_check_system(power_nocheck_dmi_table);
	return result;
}

subsys_initcall(acpi_init);