bus.c revision 02c37bd8d0737c31caaed9a65bd7cb80aefb4c9a 
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#include "internal.h"
43
44#define _COMPONENT		ACPI_BUS_COMPONENT
45ACPI_MODULE_NAME("bus");
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
53static int set_power_nocheck(const struct dmi_system_id *id)
54{
55	printk(KERN_NOTICE PREFIX "%s detected - "
56		"disable power check in power transistion\n", id->ident);
57	acpi_power_nocheck = 1;
58	return 0;
59}
60static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
61	{
62	set_power_nocheck, "HP Pavilion 05", {
63	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
64	DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
65	DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
66	{},
67};
68
69
70/* --------------------------------------------------------------------------
71                                Device Management
72   -------------------------------------------------------------------------- */
73
74int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
75{
76	acpi_status status = AE_OK;
77
78
79	if (!device)
80		return -EINVAL;
81
82	/* TBD: Support fixed-feature devices */
83
84	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
85	if (ACPI_FAILURE(status) || !*device) {
86		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
87				  handle));
88		return -ENODEV;
89	}
90
91	return 0;
92}
93
94EXPORT_SYMBOL(acpi_bus_get_device);
95
96int acpi_bus_get_status(struct acpi_device *device)
97{
98	acpi_status status = AE_OK;
99	unsigned long long sta = 0;
100
101
102	if (!device)
103		return -EINVAL;
104
105	/*
106	 * Evaluate _STA if present.
107	 */
108	if (device->flags.dynamic_status) {
109		status =
110		    acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
111		if (ACPI_FAILURE(status))
112			return -ENODEV;
113		STRUCT_TO_INT(device->status) = (int)sta;
114	}
115
116	/*
117	 * According to ACPI spec some device can be present and functional
118	 * even if the parent is not present but functional.
119	 * In such conditions the child device should not inherit the status
120	 * from the parent.
121	 */
122	else
123		STRUCT_TO_INT(device->status) =
124		    ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
125		    ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
126
127	if (device->status.functional && !device->status.present) {
128		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
129		       "functional but not present;\n",
130			device->pnp.bus_id,
131			(u32) STRUCT_TO_INT(device->status)));
132	}
133
134	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
135			  device->pnp.bus_id,
136			  (u32) STRUCT_TO_INT(device->status)));
137
138	return 0;
139}
140
141EXPORT_SYMBOL(acpi_bus_get_status);
142
143void acpi_bus_private_data_handler(acpi_handle handle,
144				   u32 function, void *context)
145{
146	return;
147}
148EXPORT_SYMBOL(acpi_bus_private_data_handler);
149
150int acpi_bus_get_private_data(acpi_handle handle, void **data)
151{
152	acpi_status status = AE_OK;
153
154	if (!*data)
155		return -EINVAL;
156
157	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
158	if (ACPI_FAILURE(status) || !*data) {
159		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
160				handle));
161		return -ENODEV;
162	}
163
164	return 0;
165}
166EXPORT_SYMBOL(acpi_bus_get_private_data);
167
168/* --------------------------------------------------------------------------
169                                 Power Management
170   -------------------------------------------------------------------------- */
171
172int acpi_bus_get_power(acpi_handle handle, int *state)
173{
174	int result = 0;
175	acpi_status status = 0;
176	struct acpi_device *device = NULL;
177	unsigned long long psc = 0;
178
179
180	result = acpi_bus_get_device(handle, &device);
181	if (result)
182		return result;
183
184	*state = ACPI_STATE_UNKNOWN;
185
186	if (!device->flags.power_manageable) {
187		/* TBD: Non-recursive algorithm for walking up hierarchy */
188		if (device->parent)
189			*state = device->parent->power.state;
190		else
191			*state = ACPI_STATE_D0;
192	} else {
193		/*
194		 * Get the device's power state either directly (via _PSC) or
195		 * indirectly (via power resources).
196		 */
197		if (device->power.flags.explicit_get) {
198			status = acpi_evaluate_integer(device->handle, "_PSC",
199						       NULL, &psc);
200			if (ACPI_FAILURE(status))
201				return -ENODEV;
202			device->power.state = (int)psc;
203		} else if (device->power.flags.power_resources) {
204			result = acpi_power_get_inferred_state(device);
205			if (result)
206				return result;
207		}
208
209		*state = device->power.state;
210	}
211
212	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
213			  device->pnp.bus_id, device->power.state));
214
215	return 0;
216}
217
218EXPORT_SYMBOL(acpi_bus_get_power);
219
220int acpi_bus_set_power(acpi_handle handle, int state)
221{
222	int result = 0;
223	acpi_status status = AE_OK;
224	struct acpi_device *device = NULL;
225	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
226
227
228	result = acpi_bus_get_device(handle, &device);
229	if (result)
230		return result;
231
232	if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
233		return -EINVAL;
234
235	/* Make sure this is a valid target state */
236
237	if (!device->flags.power_manageable) {
238		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
239				kobject_name(&device->dev.kobj)));
240		return -ENODEV;
241	}
242	/*
243	 * Get device's current power state
244	 */
245	if (!acpi_power_nocheck) {
246		/*
247		 * Maybe the incorrect power state is returned on the bogus
248		 * bios, which is different with the real power state.
249		 * For example: the bios returns D0 state and the real power
250		 * state is D3. OS expects to set the device to D0 state. In
251		 * such case if OS uses the power state returned by the BIOS,
252		 * the device can't be transisted to the correct power state.
253		 * So if the acpi_power_nocheck is set, it is unnecessary to
254		 * get the power state by calling acpi_bus_get_power.
255		 */
256		acpi_bus_get_power(device->handle, &device->power.state);
257	}
258	if ((state == device->power.state) && !device->flags.force_power_state) {
259		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
260				  state));
261		return 0;
262	}
263
264	if (!device->power.states[state].flags.valid) {
265		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
266		return -ENODEV;
267	}
268	if (device->parent && (state < device->parent->power.state)) {
269		printk(KERN_WARNING PREFIX
270			      "Cannot set device to a higher-powered"
271			      " state than parent\n");
272		return -ENODEV;
273	}
274
275	/*
276	 * Transition Power
277	 * ----------------
278	 * On transitions to a high-powered state we first apply power (via
279	 * power resources) then evalute _PSx.  Conversly for transitions to
280	 * a lower-powered state.
281	 */
282	if (state < device->power.state) {
283		if (device->power.flags.power_resources) {
284			result = acpi_power_transition(device, state);
285			if (result)
286				goto end;
287		}
288		if (device->power.states[state].flags.explicit_set) {
289			status = acpi_evaluate_object(device->handle,
290						      object_name, NULL, NULL);
291			if (ACPI_FAILURE(status)) {
292				result = -ENODEV;
293				goto end;
294			}
295		}
296	} else {
297		if (device->power.states[state].flags.explicit_set) {
298			status = acpi_evaluate_object(device->handle,
299						      object_name, NULL, NULL);
300			if (ACPI_FAILURE(status)) {
301				result = -ENODEV;
302				goto end;
303			}
304		}
305		if (device->power.flags.power_resources) {
306			result = acpi_power_transition(device, state);
307			if (result)
308				goto end;
309		}
310	}
311
312      end:
313	if (result)
314		printk(KERN_WARNING PREFIX
315			      "Device [%s] failed to transition to D%d\n",
316			      device->pnp.bus_id, state);
317	else {
318		device->power.state = state;
319		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
320				  "Device [%s] transitioned to D%d\n",
321				  device->pnp.bus_id, state));
322	}
323
324	return result;
325}
326
327EXPORT_SYMBOL(acpi_bus_set_power);
328
329bool acpi_bus_power_manageable(acpi_handle handle)
330{
331	struct acpi_device *device;
332	int result;
333
334	result = acpi_bus_get_device(handle, &device);
335	return result ? false : device->flags.power_manageable;
336}
337
338EXPORT_SYMBOL(acpi_bus_power_manageable);
339
340bool acpi_bus_can_wakeup(acpi_handle handle)
341{
342	struct acpi_device *device;
343	int result;
344
345	result = acpi_bus_get_device(handle, &device);
346	return result ? false : device->wakeup.flags.valid;
347}
348
349EXPORT_SYMBOL(acpi_bus_can_wakeup);
350
351/* --------------------------------------------------------------------------
352                                Event Management
353   -------------------------------------------------------------------------- */
354
355#ifdef CONFIG_ACPI_PROC_EVENT
356static DEFINE_SPINLOCK(acpi_bus_event_lock);
357
358LIST_HEAD(acpi_bus_event_list);
359DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
360
361extern int event_is_open;
362
363int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
364{
365	struct acpi_bus_event *event;
366	unsigned long flags = 0;
367
368	/* drop event on the floor if no one's listening */
369	if (!event_is_open)
370		return 0;
371
372	event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
373	if (!event)
374		return -ENOMEM;
375
376	strcpy(event->device_class, device_class);
377	strcpy(event->bus_id, bus_id);
378	event->type = type;
379	event->data = data;
380
381	spin_lock_irqsave(&acpi_bus_event_lock, flags);
382	list_add_tail(&event->node, &acpi_bus_event_list);
383	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
384
385	wake_up_interruptible(&acpi_bus_event_queue);
386
387	return 0;
388
389}
390
391EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
392
393int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
394{
395	if (!device)
396		return -EINVAL;
397	return acpi_bus_generate_proc_event4(device->pnp.device_class,
398					     device->pnp.bus_id, type, data);
399}
400
401EXPORT_SYMBOL(acpi_bus_generate_proc_event);
402
403int acpi_bus_receive_event(struct acpi_bus_event *event)
404{
405	unsigned long flags = 0;
406	struct acpi_bus_event *entry = NULL;
407
408	DECLARE_WAITQUEUE(wait, current);
409
410
411	if (!event)
412		return -EINVAL;
413
414	if (list_empty(&acpi_bus_event_list)) {
415
416		set_current_state(TASK_INTERRUPTIBLE);
417		add_wait_queue(&acpi_bus_event_queue, &wait);
418
419		if (list_empty(&acpi_bus_event_list))
420			schedule();
421
422		remove_wait_queue(&acpi_bus_event_queue, &wait);
423		set_current_state(TASK_RUNNING);
424
425		if (signal_pending(current))
426			return -ERESTARTSYS;
427	}
428
429	spin_lock_irqsave(&acpi_bus_event_lock, flags);
430	if (!list_empty(&acpi_bus_event_list)) {
431		entry = list_entry(acpi_bus_event_list.next,
432				   struct acpi_bus_event, node);
433		list_del(&entry->node);
434	}
435	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
436
437	if (!entry)
438		return -ENODEV;
439
440	memcpy(event, entry, sizeof(struct acpi_bus_event));
441
442	kfree(entry);
443
444	return 0;
445}
446
447#endif	/* CONFIG_ACPI_PROC_EVENT */
448
449/* --------------------------------------------------------------------------
450                             Notification Handling
451   -------------------------------------------------------------------------- */
452
453static int
454acpi_bus_check_device(struct acpi_device *device, int *status_changed)
455{
456	acpi_status status = 0;
457	struct acpi_device_status old_status;
458
459
460	if (!device)
461		return -EINVAL;
462
463	if (status_changed)
464		*status_changed = 0;
465
466	old_status = device->status;
467
468	/*
469	 * Make sure this device's parent is present before we go about
470	 * messing with the device.
471	 */
472	if (device->parent && !device->parent->status.present) {
473		device->status = device->parent->status;
474		if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
475			if (status_changed)
476				*status_changed = 1;
477		}
478		return 0;
479	}
480
481	status = acpi_bus_get_status(device);
482	if (ACPI_FAILURE(status))
483		return -ENODEV;
484
485	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
486		return 0;
487
488	if (status_changed)
489		*status_changed = 1;
490
491	/*
492	 * Device Insertion/Removal
493	 */
494	if ((device->status.present) && !(old_status.present)) {
495		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
496		/* TBD: Handle device insertion */
497	} else if (!(device->status.present) && (old_status.present)) {
498		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
499		/* TBD: Handle device removal */
500	}
501
502	return 0;
503}
504
505static int acpi_bus_check_scope(struct acpi_device *device)
506{
507	int result = 0;
508	int status_changed = 0;
509
510
511	if (!device)
512		return -EINVAL;
513
514	/* Status Change? */
515	result = acpi_bus_check_device(device, &status_changed);
516	if (result)
517		return result;
518
519	if (!status_changed)
520		return 0;
521
522	/*
523	 * TBD: Enumerate child devices within this device's scope and
524	 *       run acpi_bus_check_device()'s on them.
525	 */
526
527	return 0;
528}
529
530static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
531int register_acpi_bus_notifier(struct notifier_block *nb)
532{
533	return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
534}
535EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
536
537void unregister_acpi_bus_notifier(struct notifier_block *nb)
538{
539	blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
540}
541EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
542
543/**
544 * acpi_bus_notify
545 * ---------------
546 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
547 */
548static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
549{
550	int result = 0;
551	struct acpi_device *device = NULL;
552	struct acpi_driver *driver;
553
554	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
555			  type, handle));
556
557	blocking_notifier_call_chain(&acpi_bus_notify_list,
558		type, (void *)handle);
559
560	if (acpi_bus_get_device(handle, &device))
561		return;
562
563	switch (type) {
564
565	case ACPI_NOTIFY_BUS_CHECK:
566		result = acpi_bus_check_scope(device);
567		/*
568		 * TBD: We'll need to outsource certain events to non-ACPI
569		 *      drivers via the device manager (device.c).
570		 */
571		break;
572
573	case ACPI_NOTIFY_DEVICE_CHECK:
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		/* TBD */
583		break;
584
585	case ACPI_NOTIFY_EJECT_REQUEST:
586		/* TBD */
587		break;
588
589	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
590		/* TBD: Exactly what does 'light' mean? */
591		break;
592
593	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
594		/* TBD */
595		break;
596
597	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
598		/* TBD */
599		break;
600
601	case ACPI_NOTIFY_POWER_FAULT:
602		/* TBD */
603		break;
604
605	default:
606		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
607				  "Received unknown/unsupported notification [%08x]\n",
608				  type));
609		break;
610	}
611
612	driver = device->driver;
613	if (driver && driver->ops.notify &&
614	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
615		driver->ops.notify(device, type);
616}
617
618/* --------------------------------------------------------------------------
619                             Initialization/Cleanup
620   -------------------------------------------------------------------------- */
621
622static int __init acpi_bus_init_irq(void)
623{
624	acpi_status status = AE_OK;
625	union acpi_object arg = { ACPI_TYPE_INTEGER };
626	struct acpi_object_list arg_list = { 1, &arg };
627	char *message = NULL;
628
629
630	/*
631	 * Let the system know what interrupt model we are using by
632	 * evaluating the \_PIC object, if exists.
633	 */
634
635	switch (acpi_irq_model) {
636	case ACPI_IRQ_MODEL_PIC:
637		message = "PIC";
638		break;
639	case ACPI_IRQ_MODEL_IOAPIC:
640		message = "IOAPIC";
641		break;
642	case ACPI_IRQ_MODEL_IOSAPIC:
643		message = "IOSAPIC";
644		break;
645	case ACPI_IRQ_MODEL_PLATFORM:
646		message = "platform specific model";
647		break;
648	default:
649		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
650		return -ENODEV;
651	}
652
653	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
654
655	arg.integer.value = acpi_irq_model;
656
657	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
658	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
659		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
660		return -ENODEV;
661	}
662
663	return 0;
664}
665
666u8 acpi_gbl_permanent_mmap;
667
668
669void __init acpi_early_init(void)
670{
671	acpi_status status = AE_OK;
672
673	if (acpi_disabled)
674		return;
675
676	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
677
678	/* enable workarounds, unless strict ACPI spec. compliance */
679	if (!acpi_strict)
680		acpi_gbl_enable_interpreter_slack = TRUE;
681
682	acpi_gbl_permanent_mmap = 1;
683
684	status = acpi_reallocate_root_table();
685	if (ACPI_FAILURE(status)) {
686		printk(KERN_ERR PREFIX
687		       "Unable to reallocate ACPI tables\n");
688		goto error0;
689	}
690
691	status = acpi_initialize_subsystem();
692	if (ACPI_FAILURE(status)) {
693		printk(KERN_ERR PREFIX
694		       "Unable to initialize the ACPI Interpreter\n");
695		goto error0;
696	}
697
698	status = acpi_load_tables();
699	if (ACPI_FAILURE(status)) {
700		printk(KERN_ERR PREFIX
701		       "Unable to load the System Description Tables\n");
702		goto error0;
703	}
704
705#ifdef CONFIG_X86
706	if (!acpi_ioapic) {
707		/* compatible (0) means level (3) */
708		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
709			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
710			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
711		}
712		/* Set PIC-mode SCI trigger type */
713		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
714					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
715	} else {
716		/*
717		 * now that acpi_gbl_FADT is initialized,
718		 * update it with result from INT_SRC_OVR parsing
719		 */
720		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
721	}
722#endif
723
724	status =
725	    acpi_enable_subsystem(~
726				  (ACPI_NO_HARDWARE_INIT |
727				   ACPI_NO_ACPI_ENABLE));
728	if (ACPI_FAILURE(status)) {
729		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
730		goto error0;
731	}
732
733	return;
734
735      error0:
736	disable_acpi();
737	return;
738}
739
740static int __init acpi_bus_init(void)
741{
742	int result = 0;
743	acpi_status status = AE_OK;
744	extern acpi_status acpi_os_initialize1(void);
745
746	acpi_os_initialize1();
747
748	status =
749	    acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
750	if (ACPI_FAILURE(status)) {
751		printk(KERN_ERR PREFIX
752		       "Unable to start the ACPI Interpreter\n");
753		goto error1;
754	}
755
756	/*
757	 * ACPI 2.0 requires the EC driver to be loaded and work before
758	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
759	 * is called).
760	 *
761	 * This is accomplished by looking for the ECDT table, and getting
762	 * the EC parameters out of that.
763	 */
764	status = acpi_ec_ecdt_probe();
765	/* Ignore result. Not having an ECDT is not fatal. */
766
767	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
768	if (ACPI_FAILURE(status)) {
769		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
770		goto error1;
771	}
772
773	/*
774	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
775	 * is necessary to enable it as early as possible.
776	 */
777	acpi_boot_ec_enable();
778
779	printk(KERN_INFO PREFIX "Interpreter enabled\n");
780
781	/* Initialize sleep structures */
782	acpi_sleep_init();
783
784	/*
785	 * Get the system interrupt model and evaluate \_PIC.
786	 */
787	result = acpi_bus_init_irq();
788	if (result)
789		goto error1;
790
791	/*
792	 * Register the for all standard device notifications.
793	 */
794	status =
795	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
796					&acpi_bus_notify, NULL);
797	if (ACPI_FAILURE(status)) {
798		printk(KERN_ERR PREFIX
799		       "Unable to register for device notifications\n");
800		goto error1;
801	}
802
803	/*
804	 * Create the top ACPI proc directory
805	 */
806	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
807
808	return 0;
809
810	/* Mimic structured exception handling */
811      error1:
812	acpi_terminate();
813	return -ENODEV;
814}
815
816struct kobject *acpi_kobj;
817
818static int __init acpi_init(void)
819{
820	int result = 0;
821
822
823	if (acpi_disabled) {
824		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
825		return -ENODEV;
826	}
827
828	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
829	if (!acpi_kobj) {
830		printk(KERN_WARNING "%s: kset create error\n", __func__);
831		acpi_kobj = NULL;
832	}
833
834	init_acpi_device_notify();
835	result = acpi_bus_init();
836
837	if (!result) {
838		pci_mmcfg_late_init();
839		if (!(pm_flags & PM_APM))
840			pm_flags |= PM_ACPI;
841		else {
842			printk(KERN_INFO PREFIX
843			       "APM is already active, exiting\n");
844			disable_acpi();
845			result = -ENODEV;
846		}
847	} else
848		disable_acpi();
849
850	if (acpi_disabled)
851		return result;
852
853	/*
854	 * If the laptop falls into the DMI check table, the power state check
855	 * will be disabled in the course of device power transistion.
856	 */
857	dmi_check_system(power_nocheck_dmi_table);
858
859	acpi_scan_init();
860	acpi_ec_init();
861	acpi_power_init();
862	acpi_system_init();
863	acpi_debug_init();
864	acpi_sleep_proc_init();
865	acpi_wakeup_device_init();
866	return result;
867}
868
869subsys_initcall(acpi_init);
870