bus.c revision 176f9c1804df09f3e9b998c0642e212592ac6283 
1/*
2 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
3 *
4 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 *  This program is free software; you can redistribute it and/or modify
9 *  it under the terms of the GNU General Public License as published by
10 *  the Free Software Foundation; either version 2 of the License, or (at
11 *  your option) any later version.
12 *
13 *  This program is distributed in the hope that it will be useful, but
14 *  WITHOUT ANY WARRANTY; without even the implied warranty of
15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 *  General Public License for more details.
17 *
18 *  You should have received a copy of the GNU General Public License along
19 *  with this program; if not, write to the Free Software Foundation, Inc.,
20 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/ioport.h>
28#include <linux/kernel.h>
29#include <linux/list.h>
30#include <linux/sched.h>
31#include <linux/pm.h>
32#include <linux/device.h>
33#include <linux/proc_fs.h>
34#include <linux/acpi.h>
35#ifdef CONFIG_X86
36#include <asm/mpspec.h>
37#endif
38#include <linux/pci.h>
39#include <acpi/acpi_bus.h>
40#include <acpi/acpi_drivers.h>
41
42#define _COMPONENT		ACPI_BUS_COMPONENT
43ACPI_MODULE_NAME("bus");
44
45struct acpi_device *acpi_root;
46struct proc_dir_entry *acpi_root_dir;
47EXPORT_SYMBOL(acpi_root_dir);
48
49#define STRUCT_TO_INT(s)	(*((int*)&s))
50
51static int set_power_nocheck(const struct dmi_system_id *id)
52{
53	printk(KERN_NOTICE PREFIX "%s detected - "
54		"disable power check in power transistion\n", id->ident);
55	acpi_power_nocheck = 1;
56	return 0;
57}
58static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
59	{
60	set_power_nocheck, "HP Pavilion 05", {
61	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
62	DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
63	DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
64	{},
65};
66
67
68/* --------------------------------------------------------------------------
69                                Device Management
70   -------------------------------------------------------------------------- */
71
72int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
73{
74	acpi_status status = AE_OK;
75
76
77	if (!device)
78		return -EINVAL;
79
80	/* TBD: Support fixed-feature devices */
81
82	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
83	if (ACPI_FAILURE(status) || !*device) {
84		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
85				  handle));
86		return -ENODEV;
87	}
88
89	return 0;
90}
91
92EXPORT_SYMBOL(acpi_bus_get_device);
93
94int acpi_bus_get_status(struct acpi_device *device)
95{
96	acpi_status status = AE_OK;
97	unsigned long long sta = 0;
98
99
100	if (!device)
101		return -EINVAL;
102
103	/*
104	 * Evaluate _STA if present.
105	 */
106	if (device->flags.dynamic_status) {
107		status =
108		    acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
109		if (ACPI_FAILURE(status))
110			return -ENODEV;
111		STRUCT_TO_INT(device->status) = (int)sta;
112	}
113
114	/*
115	 * According to ACPI spec some device can be present and functional
116	 * even if the parent is not present but functional.
117	 * In such conditions the child device should not inherit the status
118	 * from the parent.
119	 */
120	else
121		STRUCT_TO_INT(device->status) =
122		    ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
123		    ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
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
136	return 0;
137}
138
139EXPORT_SYMBOL(acpi_bus_get_status);
140
141void acpi_bus_private_data_handler(acpi_handle handle,
142				   u32 function, void *context)
143{
144	return;
145}
146EXPORT_SYMBOL(acpi_bus_private_data_handler);
147
148int acpi_bus_get_private_data(acpi_handle handle, void **data)
149{
150	acpi_status status = AE_OK;
151
152	if (!*data)
153		return -EINVAL;
154
155	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
156	if (ACPI_FAILURE(status) || !*data) {
157		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
158				handle));
159		return -ENODEV;
160	}
161
162	return 0;
163}
164EXPORT_SYMBOL(acpi_bus_get_private_data);
165
166/* --------------------------------------------------------------------------
167                                 Power Management
168   -------------------------------------------------------------------------- */
169
170int acpi_bus_get_power(acpi_handle handle, int *state)
171{
172	int result = 0;
173	acpi_status status = 0;
174	struct acpi_device *device = NULL;
175	unsigned long long psc = 0;
176
177
178	result = acpi_bus_get_device(handle, &device);
179	if (result)
180		return result;
181
182	*state = ACPI_STATE_UNKNOWN;
183
184	if (!device->flags.power_manageable) {
185		/* TBD: Non-recursive algorithm for walking up hierarchy */
186		if (device->parent)
187			*state = device->parent->power.state;
188		else
189			*state = ACPI_STATE_D0;
190	} else {
191		/*
192		 * Get the device's power state either directly (via _PSC) or
193		 * indirectly (via power resources).
194		 */
195		if (device->power.flags.explicit_get) {
196			status = acpi_evaluate_integer(device->handle, "_PSC",
197						       NULL, &psc);
198			if (ACPI_FAILURE(status))
199				return -ENODEV;
200			device->power.state = (int)psc;
201		} else if (device->power.flags.power_resources) {
202			result = acpi_power_get_inferred_state(device);
203			if (result)
204				return result;
205		}
206
207		*state = device->power.state;
208	}
209
210	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
211			  device->pnp.bus_id, device->power.state));
212
213	return 0;
214}
215
216EXPORT_SYMBOL(acpi_bus_get_power);
217
218int acpi_bus_set_power(acpi_handle handle, int state)
219{
220	int result = 0;
221	acpi_status status = AE_OK;
222	struct acpi_device *device = NULL;
223	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
224
225
226	result = acpi_bus_get_device(handle, &device);
227	if (result)
228		return result;
229
230	if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
231		return -EINVAL;
232
233	/* Make sure this is a valid target state */
234
235	if (!device->flags.power_manageable) {
236		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
237				kobject_name(&device->dev.kobj)));
238		return -ENODEV;
239	}
240	/*
241	 * Get device's current power state
242	 */
243	if (!acpi_power_nocheck) {
244		/*
245		 * Maybe the incorrect power state is returned on the bogus
246		 * bios, which is different with the real power state.
247		 * For example: the bios returns D0 state and the real power
248		 * state is D3. OS expects to set the device to D0 state. In
249		 * such case if OS uses the power state returned by the BIOS,
250		 * the device can't be transisted to the correct power state.
251		 * So if the acpi_power_nocheck is set, it is unnecessary to
252		 * get the power state by calling acpi_bus_get_power.
253		 */
254		acpi_bus_get_power(device->handle, &device->power.state);
255	}
256	if ((state == device->power.state) && !device->flags.force_power_state) {
257		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
258				  state));
259		return 0;
260	}
261
262	if (!device->power.states[state].flags.valid) {
263		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
264		return -ENODEV;
265	}
266	if (device->parent && (state < device->parent->power.state)) {
267		printk(KERN_WARNING PREFIX
268			      "Cannot set device to a higher-powered"
269			      " state than parent\n");
270		return -ENODEV;
271	}
272
273	/*
274	 * Transition Power
275	 * ----------------
276	 * On transitions to a high-powered state we first apply power (via
277	 * power resources) then evalute _PSx.  Conversly for transitions to
278	 * a lower-powered state.
279	 */
280	if (state < device->power.state) {
281		if (device->power.flags.power_resources) {
282			result = acpi_power_transition(device, state);
283			if (result)
284				goto end;
285		}
286		if (device->power.states[state].flags.explicit_set) {
287			status = acpi_evaluate_object(device->handle,
288						      object_name, NULL, NULL);
289			if (ACPI_FAILURE(status)) {
290				result = -ENODEV;
291				goto end;
292			}
293		}
294	} else {
295		if (device->power.states[state].flags.explicit_set) {
296			status = acpi_evaluate_object(device->handle,
297						      object_name, NULL, NULL);
298			if (ACPI_FAILURE(status)) {
299				result = -ENODEV;
300				goto end;
301			}
302		}
303		if (device->power.flags.power_resources) {
304			result = acpi_power_transition(device, state);
305			if (result)
306				goto end;
307		}
308	}
309
310      end:
311	if (result)
312		printk(KERN_WARNING PREFIX
313			      "Transitioning device [%s] to D%d\n",
314			      device->pnp.bus_id, state);
315	else {
316		device->power.state = state;
317		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
318				  "Device [%s] transitioned to D%d\n",
319				  device->pnp.bus_id, state));
320	}
321
322	return result;
323}
324
325EXPORT_SYMBOL(acpi_bus_set_power);
326
327bool acpi_bus_power_manageable(acpi_handle handle)
328{
329	struct acpi_device *device;
330	int result;
331
332	result = acpi_bus_get_device(handle, &device);
333	return result ? false : device->flags.power_manageable;
334}
335
336EXPORT_SYMBOL(acpi_bus_power_manageable);
337
338bool acpi_bus_can_wakeup(acpi_handle handle)
339{
340	struct acpi_device *device;
341	int result;
342
343	result = acpi_bus_get_device(handle, &device);
344	return result ? false : device->wakeup.flags.valid;
345}
346
347EXPORT_SYMBOL(acpi_bus_can_wakeup);
348
349/* --------------------------------------------------------------------------
350                                Event Management
351   -------------------------------------------------------------------------- */
352
353#ifdef CONFIG_ACPI_PROC_EVENT
354static DEFINE_SPINLOCK(acpi_bus_event_lock);
355
356LIST_HEAD(acpi_bus_event_list);
357DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
358
359extern int event_is_open;
360
361int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
362{
363	struct acpi_bus_event *event;
364	unsigned long flags = 0;
365
366	/* drop event on the floor if no one's listening */
367	if (!event_is_open)
368		return 0;
369
370	event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
371	if (!event)
372		return -ENOMEM;
373
374	strcpy(event->device_class, device_class);
375	strcpy(event->bus_id, bus_id);
376	event->type = type;
377	event->data = data;
378
379	spin_lock_irqsave(&acpi_bus_event_lock, flags);
380	list_add_tail(&event->node, &acpi_bus_event_list);
381	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
382
383	wake_up_interruptible(&acpi_bus_event_queue);
384
385	return 0;
386
387}
388
389EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
390
391int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
392{
393	if (!device)
394		return -EINVAL;
395	return acpi_bus_generate_proc_event4(device->pnp.device_class,
396					     device->pnp.bus_id, type, data);
397}
398
399EXPORT_SYMBOL(acpi_bus_generate_proc_event);
400
401int acpi_bus_receive_event(struct acpi_bus_event *event)
402{
403	unsigned long flags = 0;
404	struct acpi_bus_event *entry = NULL;
405
406	DECLARE_WAITQUEUE(wait, current);
407
408
409	if (!event)
410		return -EINVAL;
411
412	if (list_empty(&acpi_bus_event_list)) {
413
414		set_current_state(TASK_INTERRUPTIBLE);
415		add_wait_queue(&acpi_bus_event_queue, &wait);
416
417		if (list_empty(&acpi_bus_event_list))
418			schedule();
419
420		remove_wait_queue(&acpi_bus_event_queue, &wait);
421		set_current_state(TASK_RUNNING);
422
423		if (signal_pending(current))
424			return -ERESTARTSYS;
425	}
426
427	spin_lock_irqsave(&acpi_bus_event_lock, flags);
428	if (!list_empty(&acpi_bus_event_list)) {
429		entry = list_entry(acpi_bus_event_list.next,
430				   struct acpi_bus_event, node);
431		list_del(&entry->node);
432	}
433	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
434
435	if (!entry)
436		return -ENODEV;
437
438	memcpy(event, entry, sizeof(struct acpi_bus_event));
439
440	kfree(entry);
441
442	return 0;
443}
444
445#endif	/* CONFIG_ACPI_PROC_EVENT */
446
447/* --------------------------------------------------------------------------
448                             Notification Handling
449   -------------------------------------------------------------------------- */
450
451static int
452acpi_bus_check_device(struct acpi_device *device, int *status_changed)
453{
454	acpi_status status = 0;
455	struct acpi_device_status old_status;
456
457
458	if (!device)
459		return -EINVAL;
460
461	if (status_changed)
462		*status_changed = 0;
463
464	old_status = device->status;
465
466	/*
467	 * Make sure this device's parent is present before we go about
468	 * messing with the device.
469	 */
470	if (device->parent && !device->parent->status.present) {
471		device->status = device->parent->status;
472		if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
473			if (status_changed)
474				*status_changed = 1;
475		}
476		return 0;
477	}
478
479	status = acpi_bus_get_status(device);
480	if (ACPI_FAILURE(status))
481		return -ENODEV;
482
483	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
484		return 0;
485
486	if (status_changed)
487		*status_changed = 1;
488
489	/*
490	 * Device Insertion/Removal
491	 */
492	if ((device->status.present) && !(old_status.present)) {
493		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
494		/* TBD: Handle device insertion */
495	} else if (!(device->status.present) && (old_status.present)) {
496		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
497		/* TBD: Handle device removal */
498	}
499
500	return 0;
501}
502
503static int acpi_bus_check_scope(struct acpi_device *device)
504{
505	int result = 0;
506	int status_changed = 0;
507
508
509	if (!device)
510		return -EINVAL;
511
512	/* Status Change? */
513	result = acpi_bus_check_device(device, &status_changed);
514	if (result)
515		return result;
516
517	if (!status_changed)
518		return 0;
519
520	/*
521	 * TBD: Enumerate child devices within this device's scope and
522	 *       run acpi_bus_check_device()'s on them.
523	 */
524
525	return 0;
526}
527
528static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
529int register_acpi_bus_notifier(struct notifier_block *nb)
530{
531	return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
532}
533EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
534
535void unregister_acpi_bus_notifier(struct notifier_block *nb)
536{
537	blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
538}
539EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
540
541/**
542 * acpi_bus_notify
543 * ---------------
544 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
545 */
546static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
547{
548	int result = 0;
549	struct acpi_device *device = NULL;
550
551	blocking_notifier_call_chain(&acpi_bus_notify_list,
552		type, (void *)handle);
553
554	if (acpi_bus_get_device(handle, &device))
555		return;
556
557	switch (type) {
558
559	case ACPI_NOTIFY_BUS_CHECK:
560		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
561				  "Received BUS CHECK notification for device [%s]\n",
562				  device->pnp.bus_id));
563		result = acpi_bus_check_scope(device);
564		/*
565		 * TBD: We'll need to outsource certain events to non-ACPI
566		 *      drivers via the device manager (device.c).
567		 */
568		break;
569
570	case ACPI_NOTIFY_DEVICE_CHECK:
571		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
572				  "Received DEVICE CHECK notification for device [%s]\n",
573				  device->pnp.bus_id));
574		result = acpi_bus_check_device(device, NULL);
575		/*
576		 * TBD: We'll need to outsource certain events to non-ACPI
577		 *      drivers via the device manager (device.c).
578		 */
579		break;
580
581	case ACPI_NOTIFY_DEVICE_WAKE:
582		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
583				  "Received DEVICE WAKE notification for device [%s]\n",
584				  device->pnp.bus_id));
585		/* TBD */
586		break;
587
588	case ACPI_NOTIFY_EJECT_REQUEST:
589		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
590				  "Received EJECT REQUEST notification for device [%s]\n",
591				  device->pnp.bus_id));
592		/* TBD */
593		break;
594
595	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
596		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
597				  "Received DEVICE CHECK LIGHT notification for device [%s]\n",
598				  device->pnp.bus_id));
599		/* TBD: Exactly what does 'light' mean? */
600		break;
601
602	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
603		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604				  "Received FREQUENCY MISMATCH notification for device [%s]\n",
605				  device->pnp.bus_id));
606		/* TBD */
607		break;
608
609	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
610		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
611				  "Received BUS MODE MISMATCH notification for device [%s]\n",
612				  device->pnp.bus_id));
613		/* TBD */
614		break;
615
616	case ACPI_NOTIFY_POWER_FAULT:
617		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
618				  "Received POWER FAULT notification for device [%s]\n",
619				  device->pnp.bus_id));
620		/* TBD */
621		break;
622
623	default:
624		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
625				  "Received unknown/unsupported notification [%08x]\n",
626				  type));
627		break;
628	}
629
630	return;
631}
632
633/* --------------------------------------------------------------------------
634                             Initialization/Cleanup
635   -------------------------------------------------------------------------- */
636
637static int __init acpi_bus_init_irq(void)
638{
639	acpi_status status = AE_OK;
640	union acpi_object arg = { ACPI_TYPE_INTEGER };
641	struct acpi_object_list arg_list = { 1, &arg };
642	char *message = NULL;
643
644
645	/*
646	 * Let the system know what interrupt model we are using by
647	 * evaluating the \_PIC object, if exists.
648	 */
649
650	switch (acpi_irq_model) {
651	case ACPI_IRQ_MODEL_PIC:
652		message = "PIC";
653		break;
654	case ACPI_IRQ_MODEL_IOAPIC:
655		message = "IOAPIC";
656		break;
657	case ACPI_IRQ_MODEL_IOSAPIC:
658		message = "IOSAPIC";
659		break;
660	case ACPI_IRQ_MODEL_PLATFORM:
661		message = "platform specific model";
662		break;
663	default:
664		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
665		return -ENODEV;
666	}
667
668	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
669
670	arg.integer.value = acpi_irq_model;
671
672	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
673	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
674		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
675		return -ENODEV;
676	}
677
678	return 0;
679}
680
681u8 acpi_gbl_permanent_mmap;
682
683
684void __init acpi_early_init(void)
685{
686	acpi_status status = AE_OK;
687
688	if (acpi_disabled)
689		return;
690
691	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
692
693	/* enable workarounds, unless strict ACPI spec. compliance */
694	if (!acpi_strict)
695		acpi_gbl_enable_interpreter_slack = TRUE;
696
697	acpi_gbl_permanent_mmap = 1;
698
699	status = acpi_reallocate_root_table();
700	if (ACPI_FAILURE(status)) {
701		printk(KERN_ERR PREFIX
702		       "Unable to reallocate ACPI tables\n");
703		goto error0;
704	}
705
706	status = acpi_initialize_subsystem();
707	if (ACPI_FAILURE(status)) {
708		printk(KERN_ERR PREFIX
709		       "Unable to initialize the ACPI Interpreter\n");
710		goto error0;
711	}
712
713	status = acpi_load_tables();
714	if (ACPI_FAILURE(status)) {
715		printk(KERN_ERR PREFIX
716		       "Unable to load the System Description Tables\n");
717		goto error0;
718	}
719
720#ifdef CONFIG_X86
721	if (!acpi_ioapic) {
722		/* compatible (0) means level (3) */
723		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
724			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
725			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
726		}
727		/* Set PIC-mode SCI trigger type */
728		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
729					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
730	} else {
731		/*
732		 * now that acpi_gbl_FADT is initialized,
733		 * update it with result from INT_SRC_OVR parsing
734		 */
735		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
736	}
737#endif
738
739	status =
740	    acpi_enable_subsystem(~
741				  (ACPI_NO_HARDWARE_INIT |
742				   ACPI_NO_ACPI_ENABLE));
743	if (ACPI_FAILURE(status)) {
744		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
745		goto error0;
746	}
747
748	return;
749
750      error0:
751	disable_acpi();
752	return;
753}
754
755static int __init acpi_bus_init(void)
756{
757	int result = 0;
758	acpi_status status = AE_OK;
759	extern acpi_status acpi_os_initialize1(void);
760
761	acpi_os_initialize1();
762
763	status =
764	    acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
765	if (ACPI_FAILURE(status)) {
766		printk(KERN_ERR PREFIX
767		       "Unable to start the ACPI Interpreter\n");
768		goto error1;
769	}
770
771	/*
772	 * ACPI 2.0 requires the EC driver to be loaded and work before
773	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
774	 * is called).
775	 *
776	 * This is accomplished by looking for the ECDT table, and getting
777	 * the EC parameters out of that.
778	 */
779	status = acpi_ec_ecdt_probe();
780	/* Ignore result. Not having an ECDT is not fatal. */
781
782	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
783	if (ACPI_FAILURE(status)) {
784		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
785		goto error1;
786	}
787
788	/*
789	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
790	 * is necessary to enable it as early as possible.
791	 */
792	acpi_boot_ec_enable();
793
794	printk(KERN_INFO PREFIX "Interpreter enabled\n");
795
796	/* Initialize sleep structures */
797	acpi_sleep_init();
798
799	/*
800	 * Get the system interrupt model and evaluate \_PIC.
801	 */
802	result = acpi_bus_init_irq();
803	if (result)
804		goto error1;
805
806	/*
807	 * Register the for all standard device notifications.
808	 */
809	status =
810	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
811					&acpi_bus_notify, NULL);
812	if (ACPI_FAILURE(status)) {
813		printk(KERN_ERR PREFIX
814		       "Unable to register for device notifications\n");
815		goto error1;
816	}
817
818	/*
819	 * Create the top ACPI proc directory
820	 */
821	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
822
823	return 0;
824
825	/* Mimic structured exception handling */
826      error1:
827	acpi_terminate();
828	return -ENODEV;
829}
830
831struct kobject *acpi_kobj;
832
833static int __init acpi_init(void)
834{
835	int result = 0;
836
837
838	if (acpi_disabled) {
839		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
840		return -ENODEV;
841	}
842
843	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
844	if (!acpi_kobj) {
845		printk(KERN_WARNING "%s: kset create error\n", __func__);
846		acpi_kobj = NULL;
847	}
848
849	result = acpi_bus_init();
850
851	if (!result) {
852		pci_mmcfg_late_init();
853		if (!(pm_flags & PM_APM))
854			pm_flags |= PM_ACPI;
855		else {
856			printk(KERN_INFO PREFIX
857			       "APM is already active, exiting\n");
858			disable_acpi();
859			result = -ENODEV;
860		}
861	} else
862		disable_acpi();
863	/*
864	 * If the laptop falls into the DMI check table, the power state check
865	 * will be disabled in the course of device power transistion.
866	 */
867	dmi_check_system(power_nocheck_dmi_table);
868	return result;
869}
870
871subsys_initcall(acpi_init);
872