bus.c revision eccddd32ced0df8f9130024157bf8d37df860d76 
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 <acpi/apei.h>
43#include <linux/dmi.h>
44#include <linux/suspend.h>
45
46#include "internal.h"
47
48#define _COMPONENT		ACPI_BUS_COMPONENT
49ACPI_MODULE_NAME("bus");
50
51struct acpi_device *acpi_root;
52struct proc_dir_entry *acpi_root_dir;
53EXPORT_SYMBOL(acpi_root_dir);
54
55#define STRUCT_TO_INT(s)	(*((int*)&s))
56
57
58#ifdef CONFIG_X86
59static int set_copy_dsdt(const struct dmi_system_id *id)
60{
61	printk(KERN_NOTICE "%s detected - "
62		"force copy of DSDT to local memory\n", id->ident);
63	acpi_gbl_copy_dsdt_locally = 1;
64	return 0;
65}
66
67static struct dmi_system_id dsdt_dmi_table[] __initdata = {
68	/*
69	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
70	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
71	 */
72	{
73	 .callback = set_copy_dsdt,
74	 .ident = "TOSHIBA Satellite",
75	 .matches = {
76		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
77		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
78		},
79	},
80	{}
81};
82#else
83static struct dmi_system_id dsdt_dmi_table[] __initdata = {
84	{}
85};
86#endif
87
88/* --------------------------------------------------------------------------
89                                Device Management
90   -------------------------------------------------------------------------- */
91
92int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
93{
94	acpi_status status = AE_OK;
95
96
97	if (!device)
98		return -EINVAL;
99
100	/* TBD: Support fixed-feature devices */
101
102	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
103	if (ACPI_FAILURE(status) || !*device) {
104		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
105				  handle));
106		return -ENODEV;
107	}
108
109	return 0;
110}
111
112EXPORT_SYMBOL(acpi_bus_get_device);
113
114acpi_status acpi_bus_get_status_handle(acpi_handle handle,
115				       unsigned long long *sta)
116{
117	acpi_status status;
118
119	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
120	if (ACPI_SUCCESS(status))
121		return AE_OK;
122
123	if (status == AE_NOT_FOUND) {
124		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
125		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
126		return AE_OK;
127	}
128	return status;
129}
130
131int acpi_bus_get_status(struct acpi_device *device)
132{
133	acpi_status status;
134	unsigned long long sta;
135
136	status = acpi_bus_get_status_handle(device->handle, &sta);
137	if (ACPI_FAILURE(status))
138		return -ENODEV;
139
140	STRUCT_TO_INT(device->status) = (int) sta;
141
142	if (device->status.functional && !device->status.present) {
143		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
144		       "functional but not present;\n",
145			device->pnp.bus_id,
146			(u32) STRUCT_TO_INT(device->status)));
147	}
148
149	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
150			  device->pnp.bus_id,
151			  (u32) STRUCT_TO_INT(device->status)));
152	return 0;
153}
154EXPORT_SYMBOL(acpi_bus_get_status);
155
156void acpi_bus_private_data_handler(acpi_handle handle,
157				   void *context)
158{
159	return;
160}
161EXPORT_SYMBOL(acpi_bus_private_data_handler);
162
163int acpi_bus_get_private_data(acpi_handle handle, void **data)
164{
165	acpi_status status = AE_OK;
166
167	if (!*data)
168		return -EINVAL;
169
170	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
171	if (ACPI_FAILURE(status) || !*data) {
172		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
173				handle));
174		return -ENODEV;
175	}
176
177	return 0;
178}
179EXPORT_SYMBOL(acpi_bus_get_private_data);
180
181/* --------------------------------------------------------------------------
182                                 Power Management
183   -------------------------------------------------------------------------- */
184
185static int __acpi_bus_get_power(struct acpi_device *device, int *state)
186{
187	int result = 0;
188	acpi_status status = 0;
189	unsigned long long psc = 0;
190
191	if (!device || !state)
192		return -EINVAL;
193
194	*state = ACPI_STATE_UNKNOWN;
195
196	if (device->flags.power_manageable) {
197		/*
198		 * Get the device's power state either directly (via _PSC) or
199		 * indirectly (via power resources).
200		 */
201		if (device->power.flags.power_resources) {
202			result = acpi_power_get_inferred_state(device, state);
203			if (result)
204				return result;
205		} else if (device->power.flags.explicit_get) {
206			status = acpi_evaluate_integer(device->handle, "_PSC",
207						       NULL, &psc);
208			if (ACPI_FAILURE(status))
209				return -ENODEV;
210			*state = (int)psc;
211		}
212	} else {
213		/* TBD: Non-recursive algorithm for walking up hierarchy. */
214		*state = device->parent ?
215			device->parent->power.state : ACPI_STATE_D0;
216	}
217
218	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
219			  device->pnp.bus_id, *state));
220
221	return 0;
222}
223
224
225static int __acpi_bus_set_power(struct acpi_device *device, int state)
226{
227	int result = 0;
228	acpi_status status = AE_OK;
229	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
230
231	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
232		return -EINVAL;
233
234	/* Make sure this is a valid target state */
235
236	if (state == device->power.state) {
237		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
238				  state));
239		return 0;
240	}
241
242	if (!device->power.states[state].flags.valid) {
243		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
244		return -ENODEV;
245	}
246	if (device->parent && (state < device->parent->power.state)) {
247		printk(KERN_WARNING PREFIX
248			      "Cannot set device to a higher-powered"
249			      " state than parent\n");
250		return -ENODEV;
251	}
252
253	/*
254	 * Transition Power
255	 * ----------------
256	 * On transitions to a high-powered state we first apply power (via
257	 * power resources) then evalute _PSx.  Conversly for transitions to
258	 * a lower-powered state.
259	 */
260	if (state < device->power.state) {
261		if (device->power.flags.power_resources) {
262			result = acpi_power_transition(device, state);
263			if (result)
264				goto end;
265		}
266		if (device->power.states[state].flags.explicit_set) {
267			status = acpi_evaluate_object(device->handle,
268						      object_name, NULL, NULL);
269			if (ACPI_FAILURE(status)) {
270				result = -ENODEV;
271				goto end;
272			}
273		}
274	} else {
275		if (device->power.states[state].flags.explicit_set) {
276			status = acpi_evaluate_object(device->handle,
277						      object_name, NULL, NULL);
278			if (ACPI_FAILURE(status)) {
279				result = -ENODEV;
280				goto end;
281			}
282		}
283		if (device->power.flags.power_resources) {
284			result = acpi_power_transition(device, state);
285			if (result)
286				goto end;
287		}
288	}
289
290      end:
291	if (result)
292		printk(KERN_WARNING PREFIX
293			      "Device [%s] failed to transition to D%d\n",
294			      device->pnp.bus_id, state);
295	else {
296		device->power.state = state;
297		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
298				  "Device [%s] transitioned to D%d\n",
299				  device->pnp.bus_id, state));
300	}
301
302	return result;
303}
304
305
306int acpi_bus_set_power(acpi_handle handle, int state)
307{
308	struct acpi_device *device;
309	int result;
310
311	result = acpi_bus_get_device(handle, &device);
312	if (result)
313		return result;
314
315	if (!device->flags.power_manageable) {
316		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
317				"Device [%s] is not power manageable\n",
318				dev_name(&device->dev)));
319		return -ENODEV;
320	}
321
322	return __acpi_bus_set_power(device, state);
323}
324EXPORT_SYMBOL(acpi_bus_set_power);
325
326
327int acpi_bus_init_power(struct acpi_device *device)
328{
329	int state;
330	int result;
331
332	if (!device)
333		return -EINVAL;
334
335	device->power.state = ACPI_STATE_UNKNOWN;
336
337	result = __acpi_bus_get_power(device, &state);
338	if (result)
339		return result;
340
341	if (device->power.flags.power_resources)
342		result = acpi_power_on_resources(device, state);
343
344	if (!result)
345		device->power.state = state;
346
347	return result;
348}
349
350
351int acpi_bus_update_power(acpi_handle handle, int *state_p)
352{
353	struct acpi_device *device;
354	int state;
355	int result;
356
357	result = acpi_bus_get_device(handle, &device);
358	if (result)
359		return result;
360
361	result = __acpi_bus_get_power(device, &state);
362	if (result)
363		return result;
364
365	result = __acpi_bus_set_power(device, state);
366	if (!result && state_p)
367		*state_p = state;
368
369	return result;
370}
371EXPORT_SYMBOL_GPL(acpi_bus_update_power);
372
373
374bool acpi_bus_power_manageable(acpi_handle handle)
375{
376	struct acpi_device *device;
377	int result;
378
379	result = acpi_bus_get_device(handle, &device);
380	return result ? false : device->flags.power_manageable;
381}
382
383EXPORT_SYMBOL(acpi_bus_power_manageable);
384
385bool acpi_bus_can_wakeup(acpi_handle handle)
386{
387	struct acpi_device *device;
388	int result;
389
390	result = acpi_bus_get_device(handle, &device);
391	return result ? false : device->wakeup.flags.valid;
392}
393
394EXPORT_SYMBOL(acpi_bus_can_wakeup);
395
396static void acpi_print_osc_error(acpi_handle handle,
397	struct acpi_osc_context *context, char *error)
398{
399	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
400	int i;
401
402	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
403		printk(KERN_DEBUG "%s\n", error);
404	else {
405		printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
406		kfree(buffer.pointer);
407	}
408	printk(KERN_DEBUG"_OSC request data:");
409	for (i = 0; i < context->cap.length; i += sizeof(u32))
410		printk("%x ", *((u32 *)(context->cap.pointer + i)));
411	printk("\n");
412}
413
414static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
415{
416	int i;
417	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
418		24, 26, 28, 30, 32, 34};
419
420	if (strlen(str) != 36)
421		return AE_BAD_PARAMETER;
422	for (i = 0; i < 36; i++) {
423		if (i == 8 || i == 13 || i == 18 || i == 23) {
424			if (str[i] != '-')
425				return AE_BAD_PARAMETER;
426		} else if (!isxdigit(str[i]))
427			return AE_BAD_PARAMETER;
428	}
429	for (i = 0; i < 16; i++) {
430		uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
431		uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
432	}
433	return AE_OK;
434}
435
436acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
437{
438	acpi_status status;
439	struct acpi_object_list input;
440	union acpi_object in_params[4];
441	union acpi_object *out_obj;
442	u8 uuid[16];
443	u32 errors;
444	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
445
446	if (!context)
447		return AE_ERROR;
448	if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
449		return AE_ERROR;
450	context->ret.length = ACPI_ALLOCATE_BUFFER;
451	context->ret.pointer = NULL;
452
453	/* Setting up input parameters */
454	input.count = 4;
455	input.pointer = in_params;
456	in_params[0].type 		= ACPI_TYPE_BUFFER;
457	in_params[0].buffer.length 	= 16;
458	in_params[0].buffer.pointer	= uuid;
459	in_params[1].type 		= ACPI_TYPE_INTEGER;
460	in_params[1].integer.value 	= context->rev;
461	in_params[2].type 		= ACPI_TYPE_INTEGER;
462	in_params[2].integer.value	= context->cap.length/sizeof(u32);
463	in_params[3].type		= ACPI_TYPE_BUFFER;
464	in_params[3].buffer.length 	= context->cap.length;
465	in_params[3].buffer.pointer 	= context->cap.pointer;
466
467	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
468	if (ACPI_FAILURE(status))
469		return status;
470
471	if (!output.length)
472		return AE_NULL_OBJECT;
473
474	out_obj = output.pointer;
475	if (out_obj->type != ACPI_TYPE_BUFFER
476		|| out_obj->buffer.length != context->cap.length) {
477		acpi_print_osc_error(handle, context,
478			"_OSC evaluation returned wrong type");
479		status = AE_TYPE;
480		goto out_kfree;
481	}
482	/* Need to ignore the bit0 in result code */
483	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
484	if (errors) {
485		if (errors & OSC_REQUEST_ERROR)
486			acpi_print_osc_error(handle, context,
487				"_OSC request failed");
488		if (errors & OSC_INVALID_UUID_ERROR)
489			acpi_print_osc_error(handle, context,
490				"_OSC invalid UUID");
491		if (errors & OSC_INVALID_REVISION_ERROR)
492			acpi_print_osc_error(handle, context,
493				"_OSC invalid revision");
494		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
495			if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
496			    & OSC_QUERY_ENABLE)
497				goto out_success;
498			status = AE_SUPPORT;
499			goto out_kfree;
500		}
501		status = AE_ERROR;
502		goto out_kfree;
503	}
504out_success:
505	context->ret.length = out_obj->buffer.length;
506	context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
507	if (!context->ret.pointer) {
508		status =  AE_NO_MEMORY;
509		goto out_kfree;
510	}
511	memcpy(context->ret.pointer, out_obj->buffer.pointer,
512		context->ret.length);
513	status =  AE_OK;
514
515out_kfree:
516	kfree(output.pointer);
517	if (status != AE_OK)
518		context->ret.pointer = NULL;
519	return status;
520}
521EXPORT_SYMBOL(acpi_run_osc);
522
523bool osc_sb_apei_support_acked;
524static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
525static void acpi_bus_osc_support(void)
526{
527	u32 capbuf[2];
528	struct acpi_osc_context context = {
529		.uuid_str = sb_uuid_str,
530		.rev = 1,
531		.cap.length = 8,
532		.cap.pointer = capbuf,
533	};
534	acpi_handle handle;
535
536	capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
537	capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
538#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
539			defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
540	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
541#endif
542
543#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
544	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
545#endif
546
547#ifdef CONFIG_ACPI_APEI_GHES
548	if (!ghes_disable)
549		capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
550#endif
551	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
552		return;
553	if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
554		u32 *capbuf_ret = context.ret.pointer;
555		if (context.ret.length > OSC_SUPPORT_TYPE)
556			osc_sb_apei_support_acked =
557				capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
558		kfree(context.ret.pointer);
559	}
560	/* do we need to check other returned cap? Sounds no */
561}
562
563/* --------------------------------------------------------------------------
564                                Event Management
565   -------------------------------------------------------------------------- */
566
567#ifdef CONFIG_ACPI_PROC_EVENT
568static DEFINE_SPINLOCK(acpi_bus_event_lock);
569
570LIST_HEAD(acpi_bus_event_list);
571DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
572
573extern int event_is_open;
574
575int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
576{
577	struct acpi_bus_event *event;
578	unsigned long flags = 0;
579
580	/* drop event on the floor if no one's listening */
581	if (!event_is_open)
582		return 0;
583
584	event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
585	if (!event)
586		return -ENOMEM;
587
588	strcpy(event->device_class, device_class);
589	strcpy(event->bus_id, bus_id);
590	event->type = type;
591	event->data = data;
592
593	spin_lock_irqsave(&acpi_bus_event_lock, flags);
594	list_add_tail(&event->node, &acpi_bus_event_list);
595	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
596
597	wake_up_interruptible(&acpi_bus_event_queue);
598
599	return 0;
600
601}
602
603EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
604
605int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
606{
607	if (!device)
608		return -EINVAL;
609	return acpi_bus_generate_proc_event4(device->pnp.device_class,
610					     device->pnp.bus_id, type, data);
611}
612
613EXPORT_SYMBOL(acpi_bus_generate_proc_event);
614
615int acpi_bus_receive_event(struct acpi_bus_event *event)
616{
617	unsigned long flags = 0;
618	struct acpi_bus_event *entry = NULL;
619
620	DECLARE_WAITQUEUE(wait, current);
621
622
623	if (!event)
624		return -EINVAL;
625
626	if (list_empty(&acpi_bus_event_list)) {
627
628		set_current_state(TASK_INTERRUPTIBLE);
629		add_wait_queue(&acpi_bus_event_queue, &wait);
630
631		if (list_empty(&acpi_bus_event_list))
632			schedule();
633
634		remove_wait_queue(&acpi_bus_event_queue, &wait);
635		set_current_state(TASK_RUNNING);
636
637		if (signal_pending(current))
638			return -ERESTARTSYS;
639	}
640
641	spin_lock_irqsave(&acpi_bus_event_lock, flags);
642	if (!list_empty(&acpi_bus_event_list)) {
643		entry = list_entry(acpi_bus_event_list.next,
644				   struct acpi_bus_event, node);
645		list_del(&entry->node);
646	}
647	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
648
649	if (!entry)
650		return -ENODEV;
651
652	memcpy(event, entry, sizeof(struct acpi_bus_event));
653
654	kfree(entry);
655
656	return 0;
657}
658
659#endif	/* CONFIG_ACPI_PROC_EVENT */
660
661/* --------------------------------------------------------------------------
662                             Notification Handling
663   -------------------------------------------------------------------------- */
664
665static void acpi_bus_check_device(acpi_handle handle)
666{
667	struct acpi_device *device;
668	acpi_status status;
669	struct acpi_device_status old_status;
670
671	if (acpi_bus_get_device(handle, &device))
672		return;
673	if (!device)
674		return;
675
676	old_status = device->status;
677
678	/*
679	 * Make sure this device's parent is present before we go about
680	 * messing with the device.
681	 */
682	if (device->parent && !device->parent->status.present) {
683		device->status = device->parent->status;
684		return;
685	}
686
687	status = acpi_bus_get_status(device);
688	if (ACPI_FAILURE(status))
689		return;
690
691	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
692		return;
693
694	/*
695	 * Device Insertion/Removal
696	 */
697	if ((device->status.present) && !(old_status.present)) {
698		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
699		/* TBD: Handle device insertion */
700	} else if (!(device->status.present) && (old_status.present)) {
701		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
702		/* TBD: Handle device removal */
703	}
704}
705
706static void acpi_bus_check_scope(acpi_handle handle)
707{
708	/* Status Change? */
709	acpi_bus_check_device(handle);
710
711	/*
712	 * TBD: Enumerate child devices within this device's scope and
713	 *       run acpi_bus_check_device()'s on them.
714	 */
715}
716
717static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
718int register_acpi_bus_notifier(struct notifier_block *nb)
719{
720	return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
721}
722EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
723
724void unregister_acpi_bus_notifier(struct notifier_block *nb)
725{
726	blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
727}
728EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
729
730/**
731 * acpi_bus_notify
732 * ---------------
733 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
734 */
735static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
736{
737	struct acpi_device *device = NULL;
738	struct acpi_driver *driver;
739
740	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
741			  type, handle));
742
743	blocking_notifier_call_chain(&acpi_bus_notify_list,
744		type, (void *)handle);
745
746	switch (type) {
747
748	case ACPI_NOTIFY_BUS_CHECK:
749		acpi_bus_check_scope(handle);
750		/*
751		 * TBD: We'll need to outsource certain events to non-ACPI
752		 *      drivers via the device manager (device.c).
753		 */
754		break;
755
756	case ACPI_NOTIFY_DEVICE_CHECK:
757		acpi_bus_check_device(handle);
758		/*
759		 * TBD: We'll need to outsource certain events to non-ACPI
760		 *      drivers via the device manager (device.c).
761		 */
762		break;
763
764	case ACPI_NOTIFY_DEVICE_WAKE:
765		/* TBD */
766		break;
767
768	case ACPI_NOTIFY_EJECT_REQUEST:
769		/* TBD */
770		break;
771
772	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
773		/* TBD: Exactly what does 'light' mean? */
774		break;
775
776	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
777		/* TBD */
778		break;
779
780	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
781		/* TBD */
782		break;
783
784	case ACPI_NOTIFY_POWER_FAULT:
785		/* TBD */
786		break;
787
788	default:
789		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
790				  "Received unknown/unsupported notification [%08x]\n",
791				  type));
792		break;
793	}
794
795	acpi_bus_get_device(handle, &device);
796	if (device) {
797		driver = device->driver;
798		if (driver && driver->ops.notify &&
799		    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
800			driver->ops.notify(device, type);
801	}
802}
803
804/* --------------------------------------------------------------------------
805                             Initialization/Cleanup
806   -------------------------------------------------------------------------- */
807
808static int __init acpi_bus_init_irq(void)
809{
810	acpi_status status = AE_OK;
811	union acpi_object arg = { ACPI_TYPE_INTEGER };
812	struct acpi_object_list arg_list = { 1, &arg };
813	char *message = NULL;
814
815
816	/*
817	 * Let the system know what interrupt model we are using by
818	 * evaluating the \_PIC object, if exists.
819	 */
820
821	switch (acpi_irq_model) {
822	case ACPI_IRQ_MODEL_PIC:
823		message = "PIC";
824		break;
825	case ACPI_IRQ_MODEL_IOAPIC:
826		message = "IOAPIC";
827		break;
828	case ACPI_IRQ_MODEL_IOSAPIC:
829		message = "IOSAPIC";
830		break;
831	case ACPI_IRQ_MODEL_PLATFORM:
832		message = "platform specific model";
833		break;
834	default:
835		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
836		return -ENODEV;
837	}
838
839	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
840
841	arg.integer.value = acpi_irq_model;
842
843	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
844	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
845		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
846		return -ENODEV;
847	}
848
849	return 0;
850}
851
852u8 acpi_gbl_permanent_mmap;
853
854
855void __init acpi_early_init(void)
856{
857	acpi_status status = AE_OK;
858
859	if (acpi_disabled)
860		return;
861
862	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
863
864	/* enable workarounds, unless strict ACPI spec. compliance */
865	if (!acpi_strict)
866		acpi_gbl_enable_interpreter_slack = TRUE;
867
868	acpi_gbl_permanent_mmap = 1;
869
870	/*
871	 * If the machine falls into the DMI check table,
872	 * DSDT will be copied to memory
873	 */
874	dmi_check_system(dsdt_dmi_table);
875
876	status = acpi_reallocate_root_table();
877	if (ACPI_FAILURE(status)) {
878		printk(KERN_ERR PREFIX
879		       "Unable to reallocate ACPI tables\n");
880		goto error0;
881	}
882
883	status = acpi_initialize_subsystem();
884	if (ACPI_FAILURE(status)) {
885		printk(KERN_ERR PREFIX
886		       "Unable to initialize the ACPI Interpreter\n");
887		goto error0;
888	}
889
890	status = acpi_load_tables();
891	if (ACPI_FAILURE(status)) {
892		printk(KERN_ERR PREFIX
893		       "Unable to load the System Description Tables\n");
894		goto error0;
895	}
896
897#ifdef CONFIG_X86
898	if (!acpi_ioapic) {
899		/* compatible (0) means level (3) */
900		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
901			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
902			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
903		}
904		/* Set PIC-mode SCI trigger type */
905		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
906					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
907	} else {
908		/*
909		 * now that acpi_gbl_FADT is initialized,
910		 * update it with result from INT_SRC_OVR parsing
911		 */
912		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
913	}
914#endif
915
916	status =
917	    acpi_enable_subsystem(~
918				  (ACPI_NO_HARDWARE_INIT |
919				   ACPI_NO_ACPI_ENABLE));
920	if (ACPI_FAILURE(status)) {
921		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
922		goto error0;
923	}
924
925	return;
926
927      error0:
928	disable_acpi();
929	return;
930}
931
932static int __init acpi_bus_init(void)
933{
934	int result = 0;
935	acpi_status status = AE_OK;
936	extern acpi_status acpi_os_initialize1(void);
937
938	acpi_os_initialize1();
939
940	status =
941	    acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
942	if (ACPI_FAILURE(status)) {
943		printk(KERN_ERR PREFIX
944		       "Unable to start the ACPI Interpreter\n");
945		goto error1;
946	}
947
948	/*
949	 * ACPI 2.0 requires the EC driver to be loaded and work before
950	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
951	 * is called).
952	 *
953	 * This is accomplished by looking for the ECDT table, and getting
954	 * the EC parameters out of that.
955	 */
956	status = acpi_ec_ecdt_probe();
957	/* Ignore result. Not having an ECDT is not fatal. */
958
959	acpi_bus_osc_support();
960
961	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
962	if (ACPI_FAILURE(status)) {
963		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
964		goto error1;
965	}
966
967	/*
968	 * _PDC control method may load dynamic SSDT tables,
969	 * and we need to install the table handler before that.
970	 */
971	acpi_sysfs_init();
972
973	acpi_early_processor_set_pdc();
974
975	/*
976	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
977	 * is necessary to enable it as early as possible.
978	 */
979	acpi_boot_ec_enable();
980
981	printk(KERN_INFO PREFIX "Interpreter enabled\n");
982
983	/* Initialize sleep structures */
984	acpi_sleep_init();
985
986	/*
987	 * Get the system interrupt model and evaluate \_PIC.
988	 */
989	result = acpi_bus_init_irq();
990	if (result)
991		goto error1;
992
993	/*
994	 * Register the for all standard device notifications.
995	 */
996	status =
997	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
998					&acpi_bus_notify, NULL);
999	if (ACPI_FAILURE(status)) {
1000		printk(KERN_ERR PREFIX
1001		       "Unable to register for device notifications\n");
1002		goto error1;
1003	}
1004
1005	/*
1006	 * Create the top ACPI proc directory
1007	 */
1008	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1009
1010	return 0;
1011
1012	/* Mimic structured exception handling */
1013      error1:
1014	acpi_terminate();
1015	return -ENODEV;
1016}
1017
1018struct kobject *acpi_kobj;
1019
1020static int __init acpi_init(void)
1021{
1022	int result;
1023
1024	if (acpi_disabled) {
1025		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1026		return -ENODEV;
1027	}
1028
1029	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1030	if (!acpi_kobj) {
1031		printk(KERN_WARNING "%s: kset create error\n", __func__);
1032		acpi_kobj = NULL;
1033	}
1034
1035	init_acpi_device_notify();
1036	result = acpi_bus_init();
1037	if (result) {
1038		disable_acpi();
1039		return result;
1040	}
1041
1042	pci_mmcfg_late_init();
1043	acpi_scan_init();
1044	acpi_ec_init();
1045	acpi_debugfs_init();
1046	acpi_sleep_proc_init();
1047	acpi_wakeup_device_init();
1048	return 0;
1049}
1050
1051subsys_initcall(acpi_init);
1052