1/*
2 *  acpi_bus.c - ACPI Bus Driver ($Revision: 1.1.1.1 $)
3 *
4 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 *  This program is free software; you can redistribute it and/or modify
9 *  it under the terms of the GNU General Public License as published by
10 *  the Free Software Foundation; either version 2 of the License, or (at
11 *  your option) any later version.
12 *
13 *  This program is distributed in the hope that it will be useful, but
14 *  WITHOUT ANY WARRANTY; without even the implied warranty of
15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 *  General Public License for more details.
17 *
18 *  You should have received a copy of the GNU General Public License along
19 *  with this program; if not, write to the Free Software Foundation, Inc.,
20 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
28#include <linux/kernel.h>
29#include <linux/list.h>
30#include <linux/sched.h>
31#include <linux/pm.h>
32#include <linux/pm_legacy.h>
33#include <linux/device.h>
34#include <linux/proc_fs.h>
35#ifdef CONFIG_X86
36#include <asm/mpspec.h>
37#endif
38#include <acpi/acpi_bus.h>
39#include <acpi/acpi_drivers.h>
40
41#define _COMPONENT		ACPI_BUS_COMPONENT
42ACPI_MODULE_NAME("bus");
43#ifdef	CONFIG_X86
44extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
45#endif
46
47struct acpi_device *acpi_root;
48struct proc_dir_entry *acpi_root_dir;
49EXPORT_SYMBOL(acpi_root_dir);
50
51#define STRUCT_TO_INT(s)	(*((int*)&s))
52
53/* --------------------------------------------------------------------------
54                                Device Management
55   -------------------------------------------------------------------------- */
56
57int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
58{
59	acpi_status status = AE_OK;
60
61
62	if (!device)
63		return -EINVAL;
64
65	/* TBD: Support fixed-feature devices */
66
67	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
68	if (ACPI_FAILURE(status) || !*device) {
69		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
70				  handle));
71		return -ENODEV;
72	}
73
74	return 0;
75}
76
77EXPORT_SYMBOL(acpi_bus_get_device);
78
79int acpi_bus_get_status(struct acpi_device *device)
80{
81	acpi_status status = AE_OK;
82	unsigned long sta = 0;
83
84
85	if (!device)
86		return -EINVAL;
87
88	/*
89	 * Evaluate _STA if present.
90	 */
91	if (device->flags.dynamic_status) {
92		status =
93		    acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
94		if (ACPI_FAILURE(status))
95			return -ENODEV;
96		STRUCT_TO_INT(device->status) = (int)sta;
97	}
98
99	/*
100	 * Otherwise we assume the status of our parent (unless we don't
101	 * have one, in which case status is implied).
102	 */
103	else if (device->parent)
104		device->status = device->parent->status;
105	else
106		STRUCT_TO_INT(device->status) =
107		    ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
108		    ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
109
110	if (device->status.functional && !device->status.present) {
111		printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
112		       "functional but not present; setting present\n",
113		       device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
114		device->status.present = 1;
115	}
116
117	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
118			  device->pnp.bus_id,
119			  (u32) STRUCT_TO_INT(device->status)));
120
121	return 0;
122}
123
124EXPORT_SYMBOL(acpi_bus_get_status);
125
126/* --------------------------------------------------------------------------
127                                 Power Management
128   -------------------------------------------------------------------------- */
129
130int acpi_bus_get_power(acpi_handle handle, int *state)
131{
132	int result = 0;
133	acpi_status status = 0;
134	struct acpi_device *device = NULL;
135	unsigned long psc = 0;
136
137
138	result = acpi_bus_get_device(handle, &device);
139	if (result)
140		return result;
141
142	*state = ACPI_STATE_UNKNOWN;
143
144	if (!device->flags.power_manageable) {
145		/* TBD: Non-recursive algorithm for walking up hierarchy */
146		if (device->parent)
147			*state = device->parent->power.state;
148		else
149			*state = ACPI_STATE_D0;
150	} else {
151		/*
152		 * Get the device's power state either directly (via _PSC) or
153		 * indirectly (via power resources).
154		 */
155		if (device->power.flags.explicit_get) {
156			status = acpi_evaluate_integer(device->handle, "_PSC",
157						       NULL, &psc);
158			if (ACPI_FAILURE(status))
159				return -ENODEV;
160			device->power.state = (int)psc;
161		} else if (device->power.flags.power_resources) {
162			result = acpi_power_get_inferred_state(device);
163			if (result)
164				return result;
165		}
166
167		*state = device->power.state;
168	}
169
170	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
171			  device->pnp.bus_id, device->power.state));
172
173	return 0;
174}
175
176EXPORT_SYMBOL(acpi_bus_get_power);
177
178int acpi_bus_set_power(acpi_handle handle, int state)
179{
180	int result = 0;
181	acpi_status status = AE_OK;
182	struct acpi_device *device = NULL;
183	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
184
185
186	result = acpi_bus_get_device(handle, &device);
187	if (result)
188		return result;
189
190	if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
191		return -EINVAL;
192
193	/* Make sure this is a valid target state */
194
195	if (!device->flags.power_manageable) {
196		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
197				device->dev.kobj.name));
198		return -ENODEV;
199	}
200	/*
201	 * Get device's current power state if it's unknown
202	 * This means device power state isn't initialized or previous setting failed
203	 */
204	if ((device->power.state == ACPI_STATE_UNKNOWN) || device->flags.force_power_state)
205		acpi_bus_get_power(device->handle, &device->power.state);
206	if ((state == device->power.state) && !device->flags.force_power_state) {
207		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
208				  state));
209		return 0;
210	}
211
212	if (!device->power.states[state].flags.valid) {
213		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
214		return -ENODEV;
215	}
216	if (device->parent && (state < device->parent->power.state)) {
217		printk(KERN_WARNING PREFIX
218			      "Cannot set device to a higher-powered"
219			      " state than parent\n");
220		return -ENODEV;
221	}
222
223	/*
224	 * Transition Power
225	 * ----------------
226	 * On transitions to a high-powered state we first apply power (via
227	 * power resources) then evalute _PSx.  Conversly for transitions to
228	 * a lower-powered state.
229	 */
230	if (state < device->power.state) {
231		if (device->power.flags.power_resources) {
232			result = acpi_power_transition(device, state);
233			if (result)
234				goto end;
235		}
236		if (device->power.states[state].flags.explicit_set) {
237			status = acpi_evaluate_object(device->handle,
238						      object_name, NULL, NULL);
239			if (ACPI_FAILURE(status)) {
240				result = -ENODEV;
241				goto end;
242			}
243		}
244	} else {
245		if (device->power.states[state].flags.explicit_set) {
246			status = acpi_evaluate_object(device->handle,
247						      object_name, NULL, NULL);
248			if (ACPI_FAILURE(status)) {
249				result = -ENODEV;
250				goto end;
251			}
252		}
253		if (device->power.flags.power_resources) {
254			result = acpi_power_transition(device, state);
255			if (result)
256				goto end;
257		}
258	}
259
260      end:
261	if (result)
262		printk(KERN_WARNING PREFIX
263			      "Transitioning device [%s] to D%d\n",
264			      device->pnp.bus_id, state);
265	else
266		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
267				  "Device [%s] transitioned to D%d\n",
268				  device->pnp.bus_id, state));
269
270	return result;
271}
272
273EXPORT_SYMBOL(acpi_bus_set_power);
274
275/* --------------------------------------------------------------------------
276                                Event Management
277   -------------------------------------------------------------------------- */
278
279static DEFINE_SPINLOCK(acpi_bus_event_lock);
280
281LIST_HEAD(acpi_bus_event_list);
282DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
283
284extern int event_is_open;
285
286int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
287{
288	struct acpi_bus_event *event = NULL;
289	unsigned long flags = 0;
290
291
292	if (!device)
293		return -EINVAL;
294
295	/* drop event on the floor if no one's listening */
296	if (!event_is_open)
297		return 0;
298
299	event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
300	if (!event)
301		return -ENOMEM;
302
303	strcpy(event->device_class, device->pnp.device_class);
304	strcpy(event->bus_id, device->pnp.bus_id);
305	event->type = type;
306	event->data = data;
307
308	spin_lock_irqsave(&acpi_bus_event_lock, flags);
309	list_add_tail(&event->node, &acpi_bus_event_list);
310	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
311
312	wake_up_interruptible(&acpi_bus_event_queue);
313
314	return 0;
315}
316
317EXPORT_SYMBOL(acpi_bus_generate_event);
318
319int acpi_bus_receive_event(struct acpi_bus_event *event)
320{
321	unsigned long flags = 0;
322	struct acpi_bus_event *entry = NULL;
323
324	DECLARE_WAITQUEUE(wait, current);
325
326
327	if (!event)
328		return -EINVAL;
329
330	if (list_empty(&acpi_bus_event_list)) {
331
332		set_current_state(TASK_INTERRUPTIBLE);
333		add_wait_queue(&acpi_bus_event_queue, &wait);
334
335		if (list_empty(&acpi_bus_event_list))
336			schedule();
337
338		remove_wait_queue(&acpi_bus_event_queue, &wait);
339		set_current_state(TASK_RUNNING);
340
341		if (signal_pending(current))
342			return -ERESTARTSYS;
343	}
344
345	spin_lock_irqsave(&acpi_bus_event_lock, flags);
346	entry =
347	    list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
348	if (entry)
349		list_del(&entry->node);
350	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
351
352	if (!entry)
353		return -ENODEV;
354
355	memcpy(event, entry, sizeof(struct acpi_bus_event));
356
357	kfree(entry);
358
359	return 0;
360}
361
362EXPORT_SYMBOL(acpi_bus_receive_event);
363
364/* --------------------------------------------------------------------------
365                             Notification Handling
366   -------------------------------------------------------------------------- */
367
368static int
369acpi_bus_check_device(struct acpi_device *device, int *status_changed)
370{
371	acpi_status status = 0;
372	struct acpi_device_status old_status;
373
374
375	if (!device)
376		return -EINVAL;
377
378	if (status_changed)
379		*status_changed = 0;
380
381	old_status = device->status;
382
383	/*
384	 * Make sure this device's parent is present before we go about
385	 * messing with the device.
386	 */
387	if (device->parent && !device->parent->status.present) {
388		device->status = device->parent->status;
389		if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
390			if (status_changed)
391				*status_changed = 1;
392		}
393		return 0;
394	}
395
396	status = acpi_bus_get_status(device);
397	if (ACPI_FAILURE(status))
398		return -ENODEV;
399
400	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
401		return 0;
402
403	if (status_changed)
404		*status_changed = 1;
405
406	/*
407	 * Device Insertion/Removal
408	 */
409	if ((device->status.present) && !(old_status.present)) {
410		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
411		/* TBD: Handle device insertion */
412	} else if (!(device->status.present) && (old_status.present)) {
413		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
414		/* TBD: Handle device removal */
415	}
416
417	return 0;
418}
419
420static int acpi_bus_check_scope(struct acpi_device *device)
421{
422	int result = 0;
423	int status_changed = 0;
424
425
426	if (!device)
427		return -EINVAL;
428
429	/* Status Change? */
430	result = acpi_bus_check_device(device, &status_changed);
431	if (result)
432		return result;
433
434	if (!status_changed)
435		return 0;
436
437	/*
438	 * TBD: Enumerate child devices within this device's scope and
439	 *       run acpi_bus_check_device()'s on them.
440	 */
441
442	return 0;
443}
444
445/**
446 * acpi_bus_notify
447 * ---------------
448 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
449 */
450static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
451{
452	int result = 0;
453	struct acpi_device *device = NULL;
454
455
456	if (acpi_bus_get_device(handle, &device))
457		return;
458
459	switch (type) {
460
461	case ACPI_NOTIFY_BUS_CHECK:
462		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
463				  "Received BUS CHECK notification for device [%s]\n",
464				  device->pnp.bus_id));
465		result = acpi_bus_check_scope(device);
466		/*
467		 * TBD: We'll need to outsource certain events to non-ACPI
468		 *      drivers via the device manager (device.c).
469		 */
470		break;
471
472	case ACPI_NOTIFY_DEVICE_CHECK:
473		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
474				  "Received DEVICE CHECK notification for device [%s]\n",
475				  device->pnp.bus_id));
476		result = acpi_bus_check_device(device, NULL);
477		/*
478		 * TBD: We'll need to outsource certain events to non-ACPI
479		 *      drivers via the device manager (device.c).
480		 */
481		break;
482
483	case ACPI_NOTIFY_DEVICE_WAKE:
484		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
485				  "Received DEVICE WAKE notification for device [%s]\n",
486				  device->pnp.bus_id));
487		/* TBD */
488		break;
489
490	case ACPI_NOTIFY_EJECT_REQUEST:
491		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
492				  "Received EJECT REQUEST notification for device [%s]\n",
493				  device->pnp.bus_id));
494		/* TBD */
495		break;
496
497	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
498		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
499				  "Received DEVICE CHECK LIGHT notification for device [%s]\n",
500				  device->pnp.bus_id));
501		/* TBD: Exactly what does 'light' mean? */
502		break;
503
504	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
505		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
506				  "Received FREQUENCY MISMATCH notification for device [%s]\n",
507				  device->pnp.bus_id));
508		/* TBD */
509		break;
510
511	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
512		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
513				  "Received BUS MODE MISMATCH notification for device [%s]\n",
514				  device->pnp.bus_id));
515		/* TBD */
516		break;
517
518	case ACPI_NOTIFY_POWER_FAULT:
519		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
520				  "Received POWER FAULT notification for device [%s]\n",
521				  device->pnp.bus_id));
522		/* TBD */
523		break;
524
525	default:
526		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
527				  "Received unknown/unsupported notification [%08x]\n",
528				  type));
529		break;
530	}
531
532	return;
533}
534
535/* --------------------------------------------------------------------------
536                             Initialization/Cleanup
537   -------------------------------------------------------------------------- */
538
539static int __init acpi_bus_init_irq(void)
540{
541	acpi_status status = AE_OK;
542	union acpi_object arg = { ACPI_TYPE_INTEGER };
543	struct acpi_object_list arg_list = { 1, &arg };
544	char *message = NULL;
545
546
547	/*
548	 * Let the system know what interrupt model we are using by
549	 * evaluating the \_PIC object, if exists.
550	 */
551
552	switch (acpi_irq_model) {
553	case ACPI_IRQ_MODEL_PIC:
554		message = "PIC";
555		break;
556	case ACPI_IRQ_MODEL_IOAPIC:
557		message = "IOAPIC";
558		break;
559	case ACPI_IRQ_MODEL_IOSAPIC:
560		message = "IOSAPIC";
561		break;
562	case ACPI_IRQ_MODEL_PLATFORM:
563		message = "platform specific model";
564		break;
565	default:
566		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
567		return -ENODEV;
568	}
569
570	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
571
572	arg.integer.value = acpi_irq_model;
573
574	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
575	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
576		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
577		return -ENODEV;
578	}
579
580	return 0;
581}
582
583acpi_native_uint acpi_gbl_permanent_mmap;
584
585
586void __init acpi_early_init(void)
587{
588	acpi_status status = AE_OK;
589
590	if (acpi_disabled)
591		return;
592
593	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
594
595	/* enable workarounds, unless strict ACPI spec. compliance */
596	if (!acpi_strict)
597		acpi_gbl_enable_interpreter_slack = TRUE;
598
599	acpi_gbl_permanent_mmap = 1;
600
601	status = acpi_reallocate_root_table();
602	if (ACPI_FAILURE(status)) {
603		printk(KERN_ERR PREFIX
604		       "Unable to reallocate ACPI tables\n");
605		goto error0;
606	}
607
608	status = acpi_initialize_subsystem();
609	if (ACPI_FAILURE(status)) {
610		printk(KERN_ERR PREFIX
611		       "Unable to initialize the ACPI Interpreter\n");
612		goto error0;
613	}
614
615	status = acpi_load_tables();
616	if (ACPI_FAILURE(status)) {
617		printk(KERN_ERR PREFIX
618		       "Unable to load the System Description Tables\n");
619		goto error0;
620	}
621
622#ifdef CONFIG_X86
623	if (!acpi_ioapic) {
624		extern u8 acpi_sci_flags;
625
626		/* compatible (0) means level (3) */
627		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
628			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
629			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
630		}
631		/* Set PIC-mode SCI trigger type */
632		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
633					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
634	} else {
635		extern int acpi_sci_override_gsi;
636		/*
637		 * now that acpi_gbl_FADT is initialized,
638		 * update it with result from INT_SRC_OVR parsing
639		 */
640		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
641	}
642#endif
643
644	status =
645	    acpi_enable_subsystem(~
646				  (ACPI_NO_HARDWARE_INIT |
647				   ACPI_NO_ACPI_ENABLE));
648	if (ACPI_FAILURE(status)) {
649		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
650		goto error0;
651	}
652
653	return;
654
655      error0:
656	disable_acpi();
657	return;
658}
659
660static int __init acpi_bus_init(void)
661{
662	int result = 0;
663	acpi_status status = AE_OK;
664	extern acpi_status acpi_os_initialize1(void);
665
666
667	status = acpi_os_initialize1();
668
669	status =
670	    acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
671	if (ACPI_FAILURE(status)) {
672		printk(KERN_ERR PREFIX
673		       "Unable to start the ACPI Interpreter\n");
674		goto error1;
675	}
676
677	if (ACPI_FAILURE(status)) {
678		printk(KERN_ERR PREFIX
679		       "Unable to initialize ACPI OS objects\n");
680		goto error1;
681	}
682#ifdef CONFIG_ACPI_EC
683	/*
684	 * ACPI 2.0 requires the EC driver to be loaded and work before
685	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
686	 * is called).
687	 *
688	 * This is accomplished by looking for the ECDT table, and getting
689	 * the EC parameters out of that.
690	 */
691	status = acpi_ec_ecdt_probe();
692	/* Ignore result. Not having an ECDT is not fatal. */
693#endif
694
695	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
696	if (ACPI_FAILURE(status)) {
697		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
698		goto error1;
699	}
700
701	printk(KERN_INFO PREFIX "Interpreter enabled\n");
702
703	/* Initialize sleep structures */
704	acpi_sleep_init();
705
706	/*
707	 * Get the system interrupt model and evaluate \_PIC.
708	 */
709	result = acpi_bus_init_irq();
710	if (result)
711		goto error1;
712
713	/*
714	 * Register the for all standard device notifications.
715	 */
716	status =
717	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
718					&acpi_bus_notify, NULL);
719	if (ACPI_FAILURE(status)) {
720		printk(KERN_ERR PREFIX
721		       "Unable to register for device notifications\n");
722		goto error1;
723	}
724
725	/*
726	 * Create the top ACPI proc directory
727	 */
728	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
729
730	return 0;
731
732	/* Mimic structured exception handling */
733      error1:
734	acpi_terminate();
735	return -ENODEV;
736}
737
738decl_subsys(acpi, NULL, NULL);
739
740static int __init acpi_init(void)
741{
742	int result = 0;
743
744
745	if (acpi_disabled) {
746		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
747		return -ENODEV;
748	}
749
750	result = firmware_register(&acpi_subsys);
751	if (result < 0)
752		printk(KERN_WARNING "%s: firmware_register error: %d\n",
753			__FUNCTION__, result);
754
755	result = acpi_bus_init();
756
757	if (!result) {
758#ifdef CONFIG_PM_LEGACY
759		if (!PM_IS_ACTIVE())
760			pm_active = 1;
761		else {
762			printk(KERN_INFO PREFIX
763			       "APM is already active, exiting\n");
764			disable_acpi();
765			result = -ENODEV;
766		}
767#endif
768	} else
769		disable_acpi();
770
771	return result;
772}
773
774subsys_initcall(acpi_init);
775