bus.c revision 5cc4a0f6b72878ea4e96fdb392d5d24c892a988e 
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#include <linux/slab.h>
36#ifdef CONFIG_X86
37#include <asm/mpspec.h>
38#endif
39#include <linux/pci.h>
40#include <acpi/acpi_bus.h>
41#include <acpi/acpi_drivers.h>
42#include <linux/dmi.h>
43
44#include "internal.h"
45
46#define _COMPONENT		ACPI_BUS_COMPONENT
47ACPI_MODULE_NAME("bus");
48
49struct acpi_device *acpi_root;
50struct proc_dir_entry *acpi_root_dir;
51EXPORT_SYMBOL(acpi_root_dir);
52
53#define STRUCT_TO_INT(s)	(*((int*)&s))
54
55static int set_power_nocheck(const struct dmi_system_id *id)
56{
57	printk(KERN_NOTICE PREFIX "%s detected - "
58		"disable power check in power transistion\n", id->ident);
59	acpi_power_nocheck = 1;
60	return 0;
61}
62static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
63	{
64	set_power_nocheck, "HP Pavilion 05", {
65	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
66	DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
67	DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
68	{},
69};
70
71
72/* --------------------------------------------------------------------------
73                                Device Management
74   -------------------------------------------------------------------------- */
75
76int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
77{
78	acpi_status status = AE_OK;
79
80
81	if (!device)
82		return -EINVAL;
83
84	/* TBD: Support fixed-feature devices */
85
86	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
87	if (ACPI_FAILURE(status) || !*device) {
88		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
89				  handle));
90		return -ENODEV;
91	}
92
93	return 0;
94}
95
96EXPORT_SYMBOL(acpi_bus_get_device);
97
98acpi_status acpi_bus_get_status_handle(acpi_handle handle,
99				       unsigned long long *sta)
100{
101	acpi_status status;
102
103	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
104	if (ACPI_SUCCESS(status))
105		return AE_OK;
106
107	if (status == AE_NOT_FOUND) {
108		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
109		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
110		return AE_OK;
111	}
112	return status;
113}
114
115int acpi_bus_get_status(struct acpi_device *device)
116{
117	acpi_status status;
118	unsigned long long sta;
119
120	status = acpi_bus_get_status_handle(device->handle, &sta);
121	if (ACPI_FAILURE(status))
122		return -ENODEV;
123
124	STRUCT_TO_INT(device->status) = (int) sta;
125
126	if (device->status.functional && !device->status.present) {
127		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
128		       "functional but not present;\n",
129			device->pnp.bus_id,
130			(u32) STRUCT_TO_INT(device->status)));
131	}
132
133	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
134			  device->pnp.bus_id,
135			  (u32) STRUCT_TO_INT(device->status)));
136	return 0;
137}
138EXPORT_SYMBOL(acpi_bus_get_status);
139
140void acpi_bus_private_data_handler(acpi_handle handle,
141				   void *context)
142{
143	return;
144}
145EXPORT_SYMBOL(acpi_bus_private_data_handler);
146
147int acpi_bus_get_private_data(acpi_handle handle, void **data)
148{
149	acpi_status status = AE_OK;
150
151	if (!*data)
152		return -EINVAL;
153
154	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
155	if (ACPI_FAILURE(status) || !*data) {
156		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
157				handle));
158		return -ENODEV;
159	}
160
161	return 0;
162}
163EXPORT_SYMBOL(acpi_bus_get_private_data);
164
165/* --------------------------------------------------------------------------
166                                 Power Management
167   -------------------------------------------------------------------------- */
168
169int acpi_bus_get_power(acpi_handle handle, int *state)
170{
171	int result = 0;
172	acpi_status status = 0;
173	struct acpi_device *device = NULL;
174	unsigned long long psc = 0;
175
176
177	result = acpi_bus_get_device(handle, &device);
178	if (result)
179		return result;
180
181	*state = ACPI_STATE_UNKNOWN;
182
183	if (!device->flags.power_manageable) {
184		/* TBD: Non-recursive algorithm for walking up hierarchy */
185		if (device->parent)
186			*state = device->parent->power.state;
187		else
188			*state = ACPI_STATE_D0;
189	} else {
190		/*
191		 * Get the device's power state either directly (via _PSC) or
192		 * indirectly (via power resources).
193		 */
194		if (device->power.flags.power_resources) {
195			result = acpi_power_get_inferred_state(device);
196			if (result)
197				return result;
198		} else if (device->power.flags.explicit_get) {
199			status = acpi_evaluate_integer(device->handle, "_PSC",
200						       NULL, &psc);
201			if (ACPI_FAILURE(status))
202				return -ENODEV;
203			device->power.state = (int)psc;
204		}
205
206		*state = device->power.state;
207	}
208
209	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
210			  device->pnp.bus_id, device->power.state));
211
212	return 0;
213}
214
215EXPORT_SYMBOL(acpi_bus_get_power);
216
217int acpi_bus_set_power(acpi_handle handle, int state)
218{
219	int result = 0;
220	acpi_status status = AE_OK;
221	struct acpi_device *device = NULL;
222	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
223
224
225	result = acpi_bus_get_device(handle, &device);
226	if (result)
227		return result;
228
229	if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
230		return -EINVAL;
231
232	/* Make sure this is a valid target state */
233
234	if (!device->flags.power_manageable) {
235		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
236				kobject_name(&device->dev.kobj)));
237		return -ENODEV;
238	}
239	/*
240	 * Get device's current power state
241	 */
242	if (!acpi_power_nocheck) {
243		/*
244		 * Maybe the incorrect power state is returned on the bogus
245		 * bios, which is different with the real power state.
246		 * For example: the bios returns D0 state and the real power
247		 * state is D3. OS expects to set the device to D0 state. In
248		 * such case if OS uses the power state returned by the BIOS,
249		 * the device can't be transisted to the correct power state.
250		 * So if the acpi_power_nocheck is set, it is unnecessary to
251		 * get the power state by calling acpi_bus_get_power.
252		 */
253		acpi_bus_get_power(device->handle, &device->power.state);
254	}
255	if ((state == device->power.state) && !device->flags.force_power_state) {
256		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
257				  state));
258		return 0;
259	}
260
261	if (!device->power.states[state].flags.valid) {
262		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
263		return -ENODEV;
264	}
265	if (device->parent && (state < device->parent->power.state)) {
266		printk(KERN_WARNING PREFIX
267			      "Cannot set device to a higher-powered"
268			      " state than parent\n");
269		return -ENODEV;
270	}
271
272	/*
273	 * Transition Power
274	 * ----------------
275	 * On transitions to a high-powered state we first apply power (via
276	 * power resources) then evalute _PSx.  Conversly for transitions to
277	 * a lower-powered state.
278	 */
279	if (state < device->power.state) {
280		if (device->power.flags.power_resources) {
281			result = acpi_power_transition(device, state);
282			if (result)
283				goto end;
284		}
285		if (device->power.states[state].flags.explicit_set) {
286			status = acpi_evaluate_object(device->handle,
287						      object_name, NULL, NULL);
288			if (ACPI_FAILURE(status)) {
289				result = -ENODEV;
290				goto end;
291			}
292		}
293	} else {
294		if (device->power.states[state].flags.explicit_set) {
295			status = acpi_evaluate_object(device->handle,
296						      object_name, NULL, NULL);
297			if (ACPI_FAILURE(status)) {
298				result = -ENODEV;
299				goto end;
300			}
301		}
302		if (device->power.flags.power_resources) {
303			result = acpi_power_transition(device, state);
304			if (result)
305				goto end;
306		}
307	}
308
309      end:
310	if (result)
311		printk(KERN_WARNING PREFIX
312			      "Device [%s] failed to transition to D%d\n",
313			      device->pnp.bus_id, state);
314	else {
315		device->power.state = state;
316		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
317				  "Device [%s] transitioned to D%d\n",
318				  device->pnp.bus_id, state));
319	}
320
321	return result;
322}
323
324EXPORT_SYMBOL(acpi_bus_set_power);
325
326bool acpi_bus_power_manageable(acpi_handle handle)
327{
328	struct acpi_device *device;
329	int result;
330
331	result = acpi_bus_get_device(handle, &device);
332	return result ? false : device->flags.power_manageable;
333}
334
335EXPORT_SYMBOL(acpi_bus_power_manageable);
336
337bool acpi_bus_can_wakeup(acpi_handle handle)
338{
339	struct acpi_device *device;
340	int result;
341
342	result = acpi_bus_get_device(handle, &device);
343	return result ? false : device->wakeup.flags.valid;
344}
345
346EXPORT_SYMBOL(acpi_bus_can_wakeup);
347
348static void acpi_print_osc_error(acpi_handle handle,
349	struct acpi_osc_context *context, char *error)
350{
351	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
352	int i;
353
354	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
355		printk(KERN_DEBUG "%s\n", error);
356	else {
357		printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
358		kfree(buffer.pointer);
359	}
360	printk(KERN_DEBUG"_OSC request data:");
361	for (i = 0; i < context->cap.length; i += sizeof(u32))
362		printk("%x ", *((u32 *)(context->cap.pointer + i)));
363	printk("\n");
364}
365
366static u8 hex_val(unsigned char c)
367{
368	return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
369}
370
371static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
372{
373	int i;
374	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
375		24, 26, 28, 30, 32, 34};
376
377	if (strlen(str) != 36)
378		return AE_BAD_PARAMETER;
379	for (i = 0; i < 36; i++) {
380		if (i == 8 || i == 13 || i == 18 || i == 23) {
381			if (str[i] != '-')
382				return AE_BAD_PARAMETER;
383		} else if (!isxdigit(str[i]))
384			return AE_BAD_PARAMETER;
385	}
386	for (i = 0; i < 16; i++) {
387		uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
388		uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
389	}
390	return AE_OK;
391}
392
393acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
394{
395	acpi_status status;
396	struct acpi_object_list input;
397	union acpi_object in_params[4];
398	union acpi_object *out_obj;
399	u8 uuid[16];
400	u32 errors;
401	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
402
403	if (!context)
404		return AE_ERROR;
405	if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
406		return AE_ERROR;
407	context->ret.length = ACPI_ALLOCATE_BUFFER;
408	context->ret.pointer = NULL;
409
410	/* Setting up input parameters */
411	input.count = 4;
412	input.pointer = in_params;
413	in_params[0].type 		= ACPI_TYPE_BUFFER;
414	in_params[0].buffer.length 	= 16;
415	in_params[0].buffer.pointer	= uuid;
416	in_params[1].type 		= ACPI_TYPE_INTEGER;
417	in_params[1].integer.value 	= context->rev;
418	in_params[2].type 		= ACPI_TYPE_INTEGER;
419	in_params[2].integer.value	= context->cap.length/sizeof(u32);
420	in_params[3].type		= ACPI_TYPE_BUFFER;
421	in_params[3].buffer.length 	= context->cap.length;
422	in_params[3].buffer.pointer 	= context->cap.pointer;
423
424	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
425	if (ACPI_FAILURE(status))
426		return status;
427
428	if (!output.length)
429		return AE_NULL_OBJECT;
430
431	out_obj = output.pointer;
432	if (out_obj->type != ACPI_TYPE_BUFFER
433		|| out_obj->buffer.length != context->cap.length) {
434		acpi_print_osc_error(handle, context,
435			"_OSC evaluation returned wrong type");
436		status = AE_TYPE;
437		goto out_kfree;
438	}
439	/* Need to ignore the bit0 in result code */
440	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
441	if (errors) {
442		if (errors & OSC_REQUEST_ERROR)
443			acpi_print_osc_error(handle, context,
444				"_OSC request failed");
445		if (errors & OSC_INVALID_UUID_ERROR)
446			acpi_print_osc_error(handle, context,
447				"_OSC invalid UUID");
448		if (errors & OSC_INVALID_REVISION_ERROR)
449			acpi_print_osc_error(handle, context,
450				"_OSC invalid revision");
451		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
452			if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
453			    & OSC_QUERY_ENABLE)
454				goto out_success;
455			status = AE_SUPPORT;
456			goto out_kfree;
457		}
458		status = AE_ERROR;
459		goto out_kfree;
460	}
461out_success:
462	context->ret.length = out_obj->buffer.length;
463	context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
464	if (!context->ret.pointer) {
465		status =  AE_NO_MEMORY;
466		goto out_kfree;
467	}
468	memcpy(context->ret.pointer, out_obj->buffer.pointer,
469		context->ret.length);
470	status =  AE_OK;
471
472out_kfree:
473	kfree(output.pointer);
474	if (status != AE_OK)
475		context->ret.pointer = NULL;
476	return status;
477}
478EXPORT_SYMBOL(acpi_run_osc);
479
480static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
481static void acpi_bus_osc_support(void)
482{
483	u32 capbuf[2];
484	struct acpi_osc_context context = {
485		.uuid_str = sb_uuid_str,
486		.rev = 1,
487		.cap.length = 8,
488		.cap.pointer = capbuf,
489	};
490	acpi_handle handle;
491
492	capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
493	capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
494#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
495			defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
496	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
497#endif
498
499#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
500	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
501#endif
502	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
503		return;
504	if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
505		kfree(context.ret.pointer);
506	/* do we need to check the returned cap? Sounds no */
507}
508
509/* --------------------------------------------------------------------------
510                                Event Management
511   -------------------------------------------------------------------------- */
512
513#ifdef CONFIG_ACPI_PROC_EVENT
514static DEFINE_SPINLOCK(acpi_bus_event_lock);
515
516LIST_HEAD(acpi_bus_event_list);
517DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
518
519extern int event_is_open;
520
521int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
522{
523	struct acpi_bus_event *event;
524	unsigned long flags = 0;
525
526	/* drop event on the floor if no one's listening */
527	if (!event_is_open)
528		return 0;
529
530	event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
531	if (!event)
532		return -ENOMEM;
533
534	strcpy(event->device_class, device_class);
535	strcpy(event->bus_id, bus_id);
536	event->type = type;
537	event->data = data;
538
539	spin_lock_irqsave(&acpi_bus_event_lock, flags);
540	list_add_tail(&event->node, &acpi_bus_event_list);
541	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
542
543	wake_up_interruptible(&acpi_bus_event_queue);
544
545	return 0;
546
547}
548
549EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
550
551int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
552{
553	if (!device)
554		return -EINVAL;
555	return acpi_bus_generate_proc_event4(device->pnp.device_class,
556					     device->pnp.bus_id, type, data);
557}
558
559EXPORT_SYMBOL(acpi_bus_generate_proc_event);
560
561int acpi_bus_receive_event(struct acpi_bus_event *event)
562{
563	unsigned long flags = 0;
564	struct acpi_bus_event *entry = NULL;
565
566	DECLARE_WAITQUEUE(wait, current);
567
568
569	if (!event)
570		return -EINVAL;
571
572	if (list_empty(&acpi_bus_event_list)) {
573
574		set_current_state(TASK_INTERRUPTIBLE);
575		add_wait_queue(&acpi_bus_event_queue, &wait);
576
577		if (list_empty(&acpi_bus_event_list))
578			schedule();
579
580		remove_wait_queue(&acpi_bus_event_queue, &wait);
581		set_current_state(TASK_RUNNING);
582
583		if (signal_pending(current))
584			return -ERESTARTSYS;
585	}
586
587	spin_lock_irqsave(&acpi_bus_event_lock, flags);
588	if (!list_empty(&acpi_bus_event_list)) {
589		entry = list_entry(acpi_bus_event_list.next,
590				   struct acpi_bus_event, node);
591		list_del(&entry->node);
592	}
593	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
594
595	if (!entry)
596		return -ENODEV;
597
598	memcpy(event, entry, sizeof(struct acpi_bus_event));
599
600	kfree(entry);
601
602	return 0;
603}
604
605#endif	/* CONFIG_ACPI_PROC_EVENT */
606
607/* --------------------------------------------------------------------------
608                             Notification Handling
609   -------------------------------------------------------------------------- */
610
611static void acpi_bus_check_device(acpi_handle handle)
612{
613	struct acpi_device *device;
614	acpi_status status;
615	struct acpi_device_status old_status;
616
617	if (acpi_bus_get_device(handle, &device))
618		return;
619	if (!device)
620		return;
621
622	old_status = device->status;
623
624	/*
625	 * Make sure this device's parent is present before we go about
626	 * messing with the device.
627	 */
628	if (device->parent && !device->parent->status.present) {
629		device->status = device->parent->status;
630		return;
631	}
632
633	status = acpi_bus_get_status(device);
634	if (ACPI_FAILURE(status))
635		return;
636
637	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
638		return;
639
640	/*
641	 * Device Insertion/Removal
642	 */
643	if ((device->status.present) && !(old_status.present)) {
644		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
645		/* TBD: Handle device insertion */
646	} else if (!(device->status.present) && (old_status.present)) {
647		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
648		/* TBD: Handle device removal */
649	}
650}
651
652static void acpi_bus_check_scope(acpi_handle handle)
653{
654	/* Status Change? */
655	acpi_bus_check_device(handle);
656
657	/*
658	 * TBD: Enumerate child devices within this device's scope and
659	 *       run acpi_bus_check_device()'s on them.
660	 */
661}
662
663static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
664int register_acpi_bus_notifier(struct notifier_block *nb)
665{
666	return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
667}
668EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
669
670void unregister_acpi_bus_notifier(struct notifier_block *nb)
671{
672	blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
673}
674EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
675
676/**
677 * acpi_bus_notify
678 * ---------------
679 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
680 */
681static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
682{
683	struct acpi_device *device = NULL;
684	struct acpi_driver *driver;
685
686	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
687			  type, handle));
688
689	blocking_notifier_call_chain(&acpi_bus_notify_list,
690		type, (void *)handle);
691
692	switch (type) {
693
694	case ACPI_NOTIFY_BUS_CHECK:
695		acpi_bus_check_scope(handle);
696		/*
697		 * TBD: We'll need to outsource certain events to non-ACPI
698		 *      drivers via the device manager (device.c).
699		 */
700		break;
701
702	case ACPI_NOTIFY_DEVICE_CHECK:
703		acpi_bus_check_device(handle);
704		/*
705		 * TBD: We'll need to outsource certain events to non-ACPI
706		 *      drivers via the device manager (device.c).
707		 */
708		break;
709
710	case ACPI_NOTIFY_DEVICE_WAKE:
711		/* TBD */
712		break;
713
714	case ACPI_NOTIFY_EJECT_REQUEST:
715		/* TBD */
716		break;
717
718	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
719		/* TBD: Exactly what does 'light' mean? */
720		break;
721
722	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
723		/* TBD */
724		break;
725
726	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
727		/* TBD */
728		break;
729
730	case ACPI_NOTIFY_POWER_FAULT:
731		/* TBD */
732		break;
733
734	default:
735		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
736				  "Received unknown/unsupported notification [%08x]\n",
737				  type));
738		break;
739	}
740
741	acpi_bus_get_device(handle, &device);
742	if (device) {
743		driver = device->driver;
744		if (driver && driver->ops.notify &&
745		    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
746			driver->ops.notify(device, type);
747	}
748}
749
750/* --------------------------------------------------------------------------
751                             Initialization/Cleanup
752   -------------------------------------------------------------------------- */
753
754static int __init acpi_bus_init_irq(void)
755{
756	acpi_status status = AE_OK;
757	union acpi_object arg = { ACPI_TYPE_INTEGER };
758	struct acpi_object_list arg_list = { 1, &arg };
759	char *message = NULL;
760
761
762	/*
763	 * Let the system know what interrupt model we are using by
764	 * evaluating the \_PIC object, if exists.
765	 */
766
767	switch (acpi_irq_model) {
768	case ACPI_IRQ_MODEL_PIC:
769		message = "PIC";
770		break;
771	case ACPI_IRQ_MODEL_IOAPIC:
772		message = "IOAPIC";
773		break;
774	case ACPI_IRQ_MODEL_IOSAPIC:
775		message = "IOSAPIC";
776		break;
777	case ACPI_IRQ_MODEL_PLATFORM:
778		message = "platform specific model";
779		break;
780	default:
781		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
782		return -ENODEV;
783	}
784
785	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
786
787	arg.integer.value = acpi_irq_model;
788
789	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
790	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
791		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
792		return -ENODEV;
793	}
794
795	return 0;
796}
797
798u8 acpi_gbl_permanent_mmap;
799
800
801void __init acpi_early_init(void)
802{
803	acpi_status status = AE_OK;
804
805	if (acpi_disabled)
806		return;
807
808	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
809
810	/* enable workarounds, unless strict ACPI spec. compliance */
811	if (!acpi_strict)
812		acpi_gbl_enable_interpreter_slack = TRUE;
813
814	acpi_gbl_permanent_mmap = 1;
815
816	status = acpi_reallocate_root_table();
817	if (ACPI_FAILURE(status)) {
818		printk(KERN_ERR PREFIX
819		       "Unable to reallocate ACPI tables\n");
820		goto error0;
821	}
822
823	status = acpi_initialize_subsystem();
824	if (ACPI_FAILURE(status)) {
825		printk(KERN_ERR PREFIX
826		       "Unable to initialize the ACPI Interpreter\n");
827		goto error0;
828	}
829
830	status = acpi_load_tables();
831	if (ACPI_FAILURE(status)) {
832		printk(KERN_ERR PREFIX
833		       "Unable to load the System Description Tables\n");
834		goto error0;
835	}
836
837#ifdef CONFIG_X86
838	if (!acpi_ioapic) {
839		/* compatible (0) means level (3) */
840		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
841			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
842			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
843		}
844		/* Set PIC-mode SCI trigger type */
845		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
846					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
847	} else {
848		/*
849		 * now that acpi_gbl_FADT is initialized,
850		 * update it with result from INT_SRC_OVR parsing
851		 */
852		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
853	}
854#endif
855
856	status =
857	    acpi_enable_subsystem(~
858				  (ACPI_NO_HARDWARE_INIT |
859				   ACPI_NO_ACPI_ENABLE));
860	if (ACPI_FAILURE(status)) {
861		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
862		goto error0;
863	}
864
865	return;
866
867      error0:
868	disable_acpi();
869	return;
870}
871
872static int __init acpi_bus_init(void)
873{
874	int result = 0;
875	acpi_status status = AE_OK;
876	extern acpi_status acpi_os_initialize1(void);
877
878	acpi_os_initialize1();
879
880	status =
881	    acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
882	if (ACPI_FAILURE(status)) {
883		printk(KERN_ERR PREFIX
884		       "Unable to start the ACPI Interpreter\n");
885		goto error1;
886	}
887
888	/*
889	 * ACPI 2.0 requires the EC driver to be loaded and work before
890	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
891	 * is called).
892	 *
893	 * This is accomplished by looking for the ECDT table, and getting
894	 * the EC parameters out of that.
895	 */
896	status = acpi_ec_ecdt_probe();
897	/* Ignore result. Not having an ECDT is not fatal. */
898
899	acpi_bus_osc_support();
900
901	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
902	if (ACPI_FAILURE(status)) {
903		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
904		goto error1;
905	}
906
907	acpi_early_processor_set_pdc();
908
909	/*
910	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
911	 * is necessary to enable it as early as possible.
912	 */
913	acpi_boot_ec_enable();
914
915	printk(KERN_INFO PREFIX "Interpreter enabled\n");
916
917	/* Initialize sleep structures */
918	acpi_sleep_init();
919
920	/*
921	 * Get the system interrupt model and evaluate \_PIC.
922	 */
923	result = acpi_bus_init_irq();
924	if (result)
925		goto error1;
926
927	/*
928	 * Register the for all standard device notifications.
929	 */
930	status =
931	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
932					&acpi_bus_notify, NULL);
933	if (ACPI_FAILURE(status)) {
934		printk(KERN_ERR PREFIX
935		       "Unable to register for device notifications\n");
936		goto error1;
937	}
938
939	/*
940	 * Create the top ACPI proc directory
941	 */
942	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
943
944	return 0;
945
946	/* Mimic structured exception handling */
947      error1:
948	acpi_terminate();
949	return -ENODEV;
950}
951
952struct kobject *acpi_kobj;
953
954static int __init acpi_init(void)
955{
956	int result = 0;
957
958
959	if (acpi_disabled) {
960		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
961		return -ENODEV;
962	}
963
964	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
965	if (!acpi_kobj) {
966		printk(KERN_WARNING "%s: kset create error\n", __func__);
967		acpi_kobj = NULL;
968	}
969
970	init_acpi_device_notify();
971	result = acpi_bus_init();
972
973	if (!result) {
974		pci_mmcfg_late_init();
975		if (!(pm_flags & PM_APM))
976			pm_flags |= PM_ACPI;
977		else {
978			printk(KERN_INFO PREFIX
979			       "APM is already active, exiting\n");
980			disable_acpi();
981			result = -ENODEV;
982		}
983	} else
984		disable_acpi();
985
986	if (acpi_disabled)
987		return result;
988
989	/*
990	 * If the laptop falls into the DMI check table, the power state check
991	 * will be disabled in the course of device power transistion.
992	 */
993	dmi_check_system(power_nocheck_dmi_table);
994
995	acpi_scan_init();
996	acpi_ec_init();
997	acpi_power_init();
998	acpi_system_init();
999	acpi_debug_init();
1000	acpi_sleep_proc_init();
1001	acpi_wakeup_device_init();
1002	return result;
1003}
1004
1005subsys_initcall(acpi_init);
1006