bus.c revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 
1/*
2 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3 *
4 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 *  This program is free software; you can redistribute it and/or modify
9 *  it under the terms of the GNU General Public License as published by
10 *  the Free Software Foundation; either version 2 of the License, or (at
11 *  your option) any later version.
12 *
13 *  This program is distributed in the hope that it will be useful, but
14 *  WITHOUT ANY WARRANTY; without even the implied warranty of
15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 *  General Public License for more details.
17 *
18 *  You should have received a copy of the GNU General Public License along
19 *  with this program; if not, write to the Free Software Foundation, Inc.,
20 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
28#include <linux/list.h>
29#include <linux/sched.h>
30#include <linux/pm.h>
31#include <linux/device.h>
32#include <linux/proc_fs.h>
33#ifdef CONFIG_X86
34#include <asm/mpspec.h>
35#endif
36#include <acpi/acpi_bus.h>
37#include <acpi/acpi_drivers.h>
38
39
40#define _COMPONENT		ACPI_BUS_COMPONENT
41ACPI_MODULE_NAME		("acpi_bus")
42
43#ifdef	CONFIG_X86
44extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
45#endif
46
47FADT_DESCRIPTOR			acpi_fadt;
48EXPORT_SYMBOL(acpi_fadt);
49
50struct acpi_device		*acpi_root;
51struct proc_dir_entry		*acpi_root_dir;
52EXPORT_SYMBOL(acpi_root_dir);
53
54#define STRUCT_TO_INT(s)	(*((int*)&s))
55
56/* --------------------------------------------------------------------------
57                                Device Management
58   -------------------------------------------------------------------------- */
59
60int
61acpi_bus_get_device (
62	acpi_handle		handle,
63	struct acpi_device	**device)
64{
65	acpi_status		status = AE_OK;
66
67	ACPI_FUNCTION_TRACE("acpi_bus_get_device");
68
69	if (!device)
70		return_VALUE(-EINVAL);
71
72	/* TBD: Support fixed-feature devices */
73
74	status = acpi_get_data(handle, acpi_bus_data_handler, (void**) device);
75	if (ACPI_FAILURE(status) || !*device) {
76		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "No context for object [%p]\n",
77			handle));
78		return_VALUE(-ENODEV);
79	}
80
81	return_VALUE(0);
82}
83EXPORT_SYMBOL(acpi_bus_get_device);
84
85int
86acpi_bus_get_status (
87	struct acpi_device	*device)
88{
89	acpi_status		status = AE_OK;
90	unsigned long		sta = 0;
91
92	ACPI_FUNCTION_TRACE("acpi_bus_get_status");
93
94	if (!device)
95		return_VALUE(-EINVAL);
96
97	/*
98	 * Evaluate _STA if present.
99	 */
100	if (device->flags.dynamic_status) {
101		status = acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
102		if (ACPI_FAILURE(status))
103			return_VALUE(-ENODEV);
104		STRUCT_TO_INT(device->status) = (int) sta;
105	}
106
107	/*
108	 * Otherwise we assume the status of our parent (unless we don't
109	 * have one, in which case status is implied).
110	 */
111	else if (device->parent)
112		device->status = device->parent->status;
113	else
114		STRUCT_TO_INT(device->status) = 0x0F;
115
116	if (device->status.functional && !device->status.present) {
117		printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
118			"functional but not present; setting present\n",
119			device->pnp.bus_id,
120			(u32) STRUCT_TO_INT(device->status));
121		device->status.present = 1;
122	}
123
124	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
125		device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status)));
126
127	return_VALUE(0);
128}
129EXPORT_SYMBOL(acpi_bus_get_status);
130
131
132/* --------------------------------------------------------------------------
133                                 Power Management
134   -------------------------------------------------------------------------- */
135
136int
137acpi_bus_get_power (
138	acpi_handle		handle,
139	int			*state)
140{
141	int			result = 0;
142	acpi_status             status = 0;
143	struct acpi_device	*device = NULL;
144	unsigned long		psc = 0;
145
146	ACPI_FUNCTION_TRACE("acpi_bus_get_power");
147
148	result = acpi_bus_get_device(handle, &device);
149	if (result)
150		return_VALUE(result);
151
152	*state = ACPI_STATE_UNKNOWN;
153
154	if (!device->flags.power_manageable) {
155		/* TBD: Non-recursive algorithm for walking up hierarchy */
156		if (device->parent)
157			*state = device->parent->power.state;
158		else
159			*state = ACPI_STATE_D0;
160	}
161	else {
162		/*
163		 * Get the device's power state either directly (via _PSC) or
164		 * indirectly (via power resources).
165		 */
166		if (device->power.flags.explicit_get) {
167			status = acpi_evaluate_integer(device->handle, "_PSC",
168				NULL, &psc);
169			if (ACPI_FAILURE(status))
170				return_VALUE(-ENODEV);
171			device->power.state = (int) psc;
172		}
173		else if (device->power.flags.power_resources) {
174			result = acpi_power_get_inferred_state(device);
175			if (result)
176				return_VALUE(result);
177		}
178
179		*state = device->power.state;
180	}
181
182	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
183		device->pnp.bus_id, device->power.state));
184
185	return_VALUE(0);
186}
187EXPORT_SYMBOL(acpi_bus_get_power);
188
189
190int
191acpi_bus_set_power (
192	acpi_handle		handle,
193	int			state)
194{
195	int			result = 0;
196	acpi_status		status = AE_OK;
197	struct acpi_device	*device = NULL;
198	char			object_name[5] = {'_','P','S','0'+state,'\0'};
199
200	ACPI_FUNCTION_TRACE("acpi_bus_set_power");
201
202	result = acpi_bus_get_device(handle, &device);
203	if (result)
204		return_VALUE(result);
205
206	if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
207		return_VALUE(-EINVAL);
208
209	/* Make sure this is a valid target state */
210
211	if (!device->flags.power_manageable) {
212		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n"));
213		return_VALUE(-ENODEV);
214	}
215	if (state == device->power.state) {
216		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state));
217		return_VALUE(0);
218	}
219	if (!device->power.states[state].flags.valid) {
220		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n", state));
221		return_VALUE(-ENODEV);
222	}
223	if (device->parent && (state < device->parent->power.state)) {
224		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Cannot set device to a higher-powered state than parent\n"));
225		return_VALUE(-ENODEV);
226	}
227
228	/*
229	 * Transition Power
230	 * ----------------
231	 * On transitions to a high-powered state we first apply power (via
232	 * power resources) then evalute _PSx.  Conversly for transitions to
233	 * a lower-powered state.
234	 */
235	if (state < device->power.state) {
236		if (device->power.flags.power_resources) {
237			result = acpi_power_transition(device, state);
238			if (result)
239				goto end;
240		}
241		if (device->power.states[state].flags.explicit_set) {
242			status = acpi_evaluate_object(device->handle,
243				object_name, NULL, NULL);
244			if (ACPI_FAILURE(status)) {
245				result = -ENODEV;
246				goto end;
247			}
248		}
249	}
250	else {
251		if (device->power.states[state].flags.explicit_set) {
252			status = acpi_evaluate_object(device->handle,
253				object_name, NULL, NULL);
254			if (ACPI_FAILURE(status)) {
255				result = -ENODEV;
256				goto end;
257			}
258		}
259		if (device->power.flags.power_resources) {
260			result = acpi_power_transition(device, state);
261			if (result)
262				goto end;
263		}
264	}
265
266end:
267	if (result)
268		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error transitioning device [%s] to D%d\n",
269			device->pnp.bus_id, state));
270	else
271		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to D%d\n",
272			device->pnp.bus_id, state));
273
274	return_VALUE(result);
275}
276EXPORT_SYMBOL(acpi_bus_set_power);
277
278
279
280/* --------------------------------------------------------------------------
281                                Event Management
282   -------------------------------------------------------------------------- */
283
284static DEFINE_SPINLOCK(acpi_bus_event_lock);
285
286LIST_HEAD(acpi_bus_event_list);
287DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
288
289extern int			event_is_open;
290
291int
292acpi_bus_generate_event (
293	struct acpi_device	*device,
294	u8			type,
295	int			data)
296{
297	struct acpi_bus_event	*event = NULL;
298	unsigned long		flags = 0;
299
300	ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
301
302	if (!device)
303		return_VALUE(-EINVAL);
304
305	/* drop event on the floor if no one's listening */
306	if (!event_is_open)
307		return_VALUE(0);
308
309	event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
310	if (!event)
311		return_VALUE(-ENOMEM);
312
313	strcpy(event->device_class, device->pnp.device_class);
314	strcpy(event->bus_id, device->pnp.bus_id);
315	event->type = type;
316	event->data = data;
317
318	spin_lock_irqsave(&acpi_bus_event_lock, flags);
319	list_add_tail(&event->node, &acpi_bus_event_list);
320	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
321
322	wake_up_interruptible(&acpi_bus_event_queue);
323
324	return_VALUE(0);
325}
326EXPORT_SYMBOL(acpi_bus_generate_event);
327
328int
329acpi_bus_receive_event (
330	struct acpi_bus_event	*event)
331{
332	unsigned long		flags = 0;
333	struct acpi_bus_event	*entry = NULL;
334
335	DECLARE_WAITQUEUE(wait, current);
336
337	ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
338
339	if (!event)
340		return_VALUE(-EINVAL);
341
342	if (list_empty(&acpi_bus_event_list)) {
343
344		set_current_state(TASK_INTERRUPTIBLE);
345		add_wait_queue(&acpi_bus_event_queue, &wait);
346
347		if (list_empty(&acpi_bus_event_list))
348			schedule();
349
350		remove_wait_queue(&acpi_bus_event_queue, &wait);
351		set_current_state(TASK_RUNNING);
352
353		if (signal_pending(current))
354			return_VALUE(-ERESTARTSYS);
355	}
356
357	spin_lock_irqsave(&acpi_bus_event_lock, flags);
358	entry = list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
359	if (entry)
360		list_del(&entry->node);
361	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
362
363	if (!entry)
364		return_VALUE(-ENODEV);
365
366	memcpy(event, entry, sizeof(struct acpi_bus_event));
367
368	kfree(entry);
369
370	return_VALUE(0);
371}
372EXPORT_SYMBOL(acpi_bus_receive_event);
373
374
375/* --------------------------------------------------------------------------
376                             Notification Handling
377   -------------------------------------------------------------------------- */
378
379static int
380acpi_bus_check_device (
381	struct acpi_device	*device,
382	int			*status_changed)
383{
384	acpi_status             status = 0;
385	struct acpi_device_status old_status;
386
387	ACPI_FUNCTION_TRACE("acpi_bus_check_device");
388
389	if (!device)
390		return_VALUE(-EINVAL);
391
392	if (status_changed)
393		*status_changed = 0;
394
395	old_status = device->status;
396
397	/*
398	 * Make sure this device's parent is present before we go about
399	 * messing with the device.
400	 */
401	if (device->parent && !device->parent->status.present) {
402		device->status = device->parent->status;
403		if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
404			if (status_changed)
405				*status_changed = 1;
406		}
407		return_VALUE(0);
408	}
409
410	status = acpi_bus_get_status(device);
411	if (ACPI_FAILURE(status))
412		return_VALUE(-ENODEV);
413
414	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
415		return_VALUE(0);
416
417	if (status_changed)
418		*status_changed = 1;
419
420	/*
421	 * Device Insertion/Removal
422	 */
423	if ((device->status.present) && !(old_status.present)) {
424		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
425		/* TBD: Handle device insertion */
426	}
427	else if (!(device->status.present) && (old_status.present)) {
428		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
429		/* TBD: Handle device removal */
430	}
431
432	return_VALUE(0);
433}
434
435
436static int
437acpi_bus_check_scope (
438	struct acpi_device	*device)
439{
440	int			result = 0;
441	int			status_changed = 0;
442
443	ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
444
445	if (!device)
446		return_VALUE(-EINVAL);
447
448	/* Status Change? */
449	result = acpi_bus_check_device(device, &status_changed);
450	if (result)
451		return_VALUE(result);
452
453	if (!status_changed)
454		return_VALUE(0);
455
456	/*
457	 * TBD: Enumerate child devices within this device's scope and
458	 *       run acpi_bus_check_device()'s on them.
459	 */
460
461	return_VALUE(0);
462}
463
464
465/**
466 * acpi_bus_notify
467 * ---------------
468 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
469 */
470static void
471acpi_bus_notify (
472	acpi_handle             handle,
473	u32                     type,
474	void                    *data)
475{
476	int			result = 0;
477	struct acpi_device	*device = NULL;
478
479	ACPI_FUNCTION_TRACE("acpi_bus_notify");
480
481	if (acpi_bus_get_device(handle, &device))
482		return_VOID;
483
484	switch (type) {
485
486	case ACPI_NOTIFY_BUS_CHECK:
487		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS CHECK notification for device [%s]\n",
488			device->pnp.bus_id));
489		result = acpi_bus_check_scope(device);
490		/*
491		 * TBD: We'll need to outsource certain events to non-ACPI
492		 *	drivers via the device manager (device.c).
493		 */
494		break;
495
496	case ACPI_NOTIFY_DEVICE_CHECK:
497		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK notification for device [%s]\n",
498			device->pnp.bus_id));
499		result = acpi_bus_check_device(device, NULL);
500		/*
501		 * TBD: We'll need to outsource certain events to non-ACPI
502		 *	drivers via the device manager (device.c).
503		 */
504		break;
505
506	case ACPI_NOTIFY_DEVICE_WAKE:
507		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE WAKE notification for device [%s]\n",
508			device->pnp.bus_id));
509		/* TBD */
510		break;
511
512	case ACPI_NOTIFY_EJECT_REQUEST:
513		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received EJECT REQUEST notification for device [%s]\n",
514			device->pnp.bus_id));
515		/* TBD */
516		break;
517
518	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
519		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK LIGHT notification for device [%s]\n",
520			device->pnp.bus_id));
521		/* TBD: Exactly what does 'light' mean? */
522		break;
523
524	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
525		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received FREQUENCY MISMATCH notification for device [%s]\n",
526			device->pnp.bus_id));
527		/* TBD */
528		break;
529
530	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
531		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS MODE MISMATCH notification for device [%s]\n",
532			device->pnp.bus_id));
533		/* TBD */
534		break;
535
536	case ACPI_NOTIFY_POWER_FAULT:
537		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received POWER FAULT notification for device [%s]\n",
538			device->pnp.bus_id));
539		/* TBD */
540		break;
541
542	default:
543		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n",
544			type));
545		break;
546	}
547
548	return_VOID;
549}
550
551/* --------------------------------------------------------------------------
552                             Initialization/Cleanup
553   -------------------------------------------------------------------------- */
554
555static int __init
556acpi_bus_init_irq (void)
557{
558	acpi_status		status = AE_OK;
559	union acpi_object	arg = {ACPI_TYPE_INTEGER};
560	struct acpi_object_list	arg_list = {1, &arg};
561	char			*message = NULL;
562
563	ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
564
565	/*
566	 * Let the system know what interrupt model we are using by
567	 * evaluating the \_PIC object, if exists.
568	 */
569
570	switch (acpi_irq_model) {
571	case ACPI_IRQ_MODEL_PIC:
572		message = "PIC";
573		break;
574	case ACPI_IRQ_MODEL_IOAPIC:
575		message = "IOAPIC";
576		break;
577	case ACPI_IRQ_MODEL_IOSAPIC:
578		message = "IOSAPIC";
579		break;
580	default:
581		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
582		return_VALUE(-ENODEV);
583	}
584
585	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
586
587	arg.integer.value = acpi_irq_model;
588
589	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
590	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
591		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
592		return_VALUE(-ENODEV);
593	}
594
595	return_VALUE(0);
596}
597
598
599void __init
600acpi_early_init (void)
601{
602	acpi_status		status = AE_OK;
603	struct acpi_buffer	buffer = {sizeof(acpi_fadt), &acpi_fadt};
604
605	ACPI_FUNCTION_TRACE("acpi_early_init");
606
607	if (acpi_disabled)
608		return_VOID;
609
610	/* enable workarounds, unless strict ACPI spec. compliance */
611	if (!acpi_strict)
612		acpi_gbl_enable_interpreter_slack = TRUE;
613
614	status = acpi_initialize_subsystem();
615	if (ACPI_FAILURE(status)) {
616		printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n");
617		goto error0;
618	}
619
620	status = acpi_load_tables();
621	if (ACPI_FAILURE(status)) {
622		printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n");
623		goto error0;
624	}
625
626	/*
627	 * Get a separate copy of the FADT for use by other drivers.
628	 */
629	status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
630	if (ACPI_FAILURE(status)) {
631		printk(KERN_ERR PREFIX "Unable to get the FADT\n");
632		goto error0;
633	}
634
635#ifdef CONFIG_X86
636	if (!acpi_ioapic) {
637		extern acpi_interrupt_flags acpi_sci_flags;
638
639		/* compatible (0) means level (3) */
640		if (acpi_sci_flags.trigger == 0)
641			acpi_sci_flags.trigger = 3;
642
643		/* Set PIC-mode SCI trigger type */
644		acpi_pic_sci_set_trigger(acpi_fadt.sci_int, acpi_sci_flags.trigger);
645	} else {
646		extern int acpi_sci_override_gsi;
647		/*
648		 * now that acpi_fadt is initialized,
649		 * update it with result from INT_SRC_OVR parsing
650		 */
651		acpi_fadt.sci_int = acpi_sci_override_gsi;
652	}
653#endif
654
655	status = acpi_enable_subsystem(~(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE));
656	if (ACPI_FAILURE(status)) {
657		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
658		goto error0;
659	}
660
661	return_VOID;
662
663error0:
664	disable_acpi();
665	return_VOID;
666}
667
668static int __init
669acpi_bus_init (void)
670{
671	int			result = 0;
672	acpi_status		status = AE_OK;
673	extern acpi_status	acpi_os_initialize1(void);
674
675	ACPI_FUNCTION_TRACE("acpi_bus_init");
676
677	status = acpi_os_initialize1();
678
679	status = acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
680	if (ACPI_FAILURE(status)) {
681		printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n");
682		goto error1;
683	}
684
685	if (ACPI_FAILURE(status)) {
686		printk(KERN_ERR PREFIX "Unable to initialize ACPI OS objects\n");
687		goto error1;
688	}
689#ifdef CONFIG_ACPI_EC
690	/*
691	 * ACPI 2.0 requires the EC driver to be loaded and work before
692	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
693	 * is called).
694	 *
695	 * This is accomplished by looking for the ECDT table, and getting
696	 * the EC parameters out of that.
697	 */
698	status = acpi_ec_ecdt_probe();
699	/* Ignore result. Not having an ECDT is not fatal. */
700#endif
701
702	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
703	if (ACPI_FAILURE(status)) {
704		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
705		goto error1;
706	}
707
708	printk(KERN_INFO PREFIX "Interpreter enabled\n");
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 = acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, &acpi_bus_notify, NULL);
721	if (ACPI_FAILURE(status)) {
722		printk(KERN_ERR PREFIX "Unable to register for device notifications\n");
723		goto error1;
724	}
725
726	/*
727	 * Create the top ACPI proc directory
728	 */
729	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
730
731	return_VALUE(0);
732
733	/* Mimic structured exception handling */
734error1:
735	acpi_terminate();
736	return_VALUE(-ENODEV);
737}
738
739decl_subsys(acpi,NULL,NULL);
740
741static int __init acpi_init (void)
742{
743	int			result = 0;
744
745	ACPI_FUNCTION_TRACE("acpi_init");
746
747	printk(KERN_INFO PREFIX "Subsystem revision %08x\n",
748		ACPI_CA_VERSION);
749
750	if (acpi_disabled) {
751		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
752		return_VALUE(-ENODEV);
753	}
754
755	firmware_register(&acpi_subsys);
756
757	result = acpi_bus_init();
758
759	if (!result) {
760#ifdef CONFIG_PM
761		if (!PM_IS_ACTIVE())
762			pm_active = 1;
763		else {
764			printk(KERN_INFO PREFIX "APM is already active, exiting\n");
765			disable_acpi();
766			result = -ENODEV;
767		}
768#endif
769	} else
770		disable_acpi();
771
772	return_VALUE(result);
773}
774
775subsys_initcall(acpi_init);
776