xref: /openbmc/linux/drivers/acpi/bus.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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 #include <linux/dmi.h>
42 
43 #include "internal.h"
44 
45 #define _COMPONENT		ACPI_BUS_COMPONENT
46 ACPI_MODULE_NAME("bus");
47 
48 struct acpi_device *acpi_root;
49 struct proc_dir_entry *acpi_root_dir;
50 EXPORT_SYMBOL(acpi_root_dir);
51 
52 #define STRUCT_TO_INT(s)	(*((int*)&s))
53 
54 static int set_power_nocheck(const struct dmi_system_id *id)
55 {
56 	printk(KERN_NOTICE PREFIX "%s detected - "
57 		"disable power check in power transistion\n", id->ident);
58 	acpi_power_nocheck = 1;
59 	return 0;
60 }
61 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
62 	{
63 	set_power_nocheck, "HP Pavilion 05", {
64 	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
65 	DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
66 	DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
67 	{},
68 };
69 
70 
71 /* --------------------------------------------------------------------------
72                                 Device Management
73    -------------------------------------------------------------------------- */
74 
75 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
76 {
77 	acpi_status status = AE_OK;
78 
79 
80 	if (!device)
81 		return -EINVAL;
82 
83 	/* TBD: Support fixed-feature devices */
84 
85 	status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
86 	if (ACPI_FAILURE(status) || !*device) {
87 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
88 				  handle));
89 		return -ENODEV;
90 	}
91 
92 	return 0;
93 }
94 
95 EXPORT_SYMBOL(acpi_bus_get_device);
96 
97 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
98 				       unsigned long long *sta)
99 {
100 	acpi_status status;
101 
102 	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
103 	if (ACPI_SUCCESS(status))
104 		return AE_OK;
105 
106 	if (status == AE_NOT_FOUND) {
107 		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
108 		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
109 		return AE_OK;
110 	}
111 	return status;
112 }
113 
114 int acpi_bus_get_status(struct acpi_device *device)
115 {
116 	acpi_status status;
117 	unsigned long long sta;
118 
119 	status = acpi_bus_get_status_handle(device->handle, &sta);
120 	if (ACPI_FAILURE(status))
121 		return -ENODEV;
122 
123 	STRUCT_TO_INT(device->status) = (int) sta;
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 	return 0;
136 }
137 EXPORT_SYMBOL(acpi_bus_get_status);
138 
139 void acpi_bus_private_data_handler(acpi_handle handle,
140 				   void *context)
141 {
142 	return;
143 }
144 EXPORT_SYMBOL(acpi_bus_private_data_handler);
145 
146 int acpi_bus_get_private_data(acpi_handle handle, void **data)
147 {
148 	acpi_status status = AE_OK;
149 
150 	if (!*data)
151 		return -EINVAL;
152 
153 	status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
154 	if (ACPI_FAILURE(status) || !*data) {
155 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
156 				handle));
157 		return -ENODEV;
158 	}
159 
160 	return 0;
161 }
162 EXPORT_SYMBOL(acpi_bus_get_private_data);
163 
164 /* --------------------------------------------------------------------------
165                                  Power Management
166    -------------------------------------------------------------------------- */
167 
168 int acpi_bus_get_power(acpi_handle handle, int *state)
169 {
170 	int result = 0;
171 	acpi_status status = 0;
172 	struct acpi_device *device = NULL;
173 	unsigned long long psc = 0;
174 
175 
176 	result = acpi_bus_get_device(handle, &device);
177 	if (result)
178 		return result;
179 
180 	*state = ACPI_STATE_UNKNOWN;
181 
182 	if (!device->flags.power_manageable) {
183 		/* TBD: Non-recursive algorithm for walking up hierarchy */
184 		if (device->parent)
185 			*state = device->parent->power.state;
186 		else
187 			*state = ACPI_STATE_D0;
188 	} else {
189 		/*
190 		 * Get the device's power state either directly (via _PSC) or
191 		 * indirectly (via power resources).
192 		 */
193 		if (device->power.flags.explicit_get) {
194 			status = acpi_evaluate_integer(device->handle, "_PSC",
195 						       NULL, &psc);
196 			if (ACPI_FAILURE(status))
197 				return -ENODEV;
198 			device->power.state = (int)psc;
199 		} else if (device->power.flags.power_resources) {
200 			result = acpi_power_get_inferred_state(device);
201 			if (result)
202 				return result;
203 		}
204 
205 		*state = device->power.state;
206 	}
207 
208 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
209 			  device->pnp.bus_id, device->power.state));
210 
211 	return 0;
212 }
213 
214 EXPORT_SYMBOL(acpi_bus_get_power);
215 
216 int acpi_bus_set_power(acpi_handle handle, int state)
217 {
218 	int result = 0;
219 	acpi_status status = AE_OK;
220 	struct acpi_device *device = NULL;
221 	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
222 
223 
224 	result = acpi_bus_get_device(handle, &device);
225 	if (result)
226 		return result;
227 
228 	if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
229 		return -EINVAL;
230 
231 	/* Make sure this is a valid target state */
232 
233 	if (!device->flags.power_manageable) {
234 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
235 				kobject_name(&device->dev.kobj)));
236 		return -ENODEV;
237 	}
238 	/*
239 	 * Get device's current power state
240 	 */
241 	if (!acpi_power_nocheck) {
242 		/*
243 		 * Maybe the incorrect power state is returned on the bogus
244 		 * bios, which is different with the real power state.
245 		 * For example: the bios returns D0 state and the real power
246 		 * state is D3. OS expects to set the device to D0 state. In
247 		 * such case if OS uses the power state returned by the BIOS,
248 		 * the device can't be transisted to the correct power state.
249 		 * So if the acpi_power_nocheck is set, it is unnecessary to
250 		 * get the power state by calling acpi_bus_get_power.
251 		 */
252 		acpi_bus_get_power(device->handle, &device->power.state);
253 	}
254 	if ((state == device->power.state) && !device->flags.force_power_state) {
255 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
256 				  state));
257 		return 0;
258 	}
259 
260 	if (!device->power.states[state].flags.valid) {
261 		printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
262 		return -ENODEV;
263 	}
264 	if (device->parent && (state < device->parent->power.state)) {
265 		printk(KERN_WARNING PREFIX
266 			      "Cannot set device to a higher-powered"
267 			      " state than parent\n");
268 		return -ENODEV;
269 	}
270 
271 	/*
272 	 * Transition Power
273 	 * ----------------
274 	 * On transitions to a high-powered state we first apply power (via
275 	 * power resources) then evalute _PSx.  Conversly for transitions to
276 	 * a lower-powered state.
277 	 */
278 	if (state < device->power.state) {
279 		if (device->power.flags.power_resources) {
280 			result = acpi_power_transition(device, state);
281 			if (result)
282 				goto end;
283 		}
284 		if (device->power.states[state].flags.explicit_set) {
285 			status = acpi_evaluate_object(device->handle,
286 						      object_name, NULL, NULL);
287 			if (ACPI_FAILURE(status)) {
288 				result = -ENODEV;
289 				goto end;
290 			}
291 		}
292 	} else {
293 		if (device->power.states[state].flags.explicit_set) {
294 			status = acpi_evaluate_object(device->handle,
295 						      object_name, NULL, NULL);
296 			if (ACPI_FAILURE(status)) {
297 				result = -ENODEV;
298 				goto end;
299 			}
300 		}
301 		if (device->power.flags.power_resources) {
302 			result = acpi_power_transition(device, state);
303 			if (result)
304 				goto end;
305 		}
306 	}
307 
308       end:
309 	if (result)
310 		printk(KERN_WARNING PREFIX
311 			      "Device [%s] failed to transition to D%d\n",
312 			      device->pnp.bus_id, state);
313 	else {
314 		device->power.state = state;
315 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316 				  "Device [%s] transitioned to D%d\n",
317 				  device->pnp.bus_id, state));
318 	}
319 
320 	return result;
321 }
322 
323 EXPORT_SYMBOL(acpi_bus_set_power);
324 
325 bool acpi_bus_power_manageable(acpi_handle handle)
326 {
327 	struct acpi_device *device;
328 	int result;
329 
330 	result = acpi_bus_get_device(handle, &device);
331 	return result ? false : device->flags.power_manageable;
332 }
333 
334 EXPORT_SYMBOL(acpi_bus_power_manageable);
335 
336 bool acpi_bus_can_wakeup(acpi_handle handle)
337 {
338 	struct acpi_device *device;
339 	int result;
340 
341 	result = acpi_bus_get_device(handle, &device);
342 	return result ? false : device->wakeup.flags.valid;
343 }
344 
345 EXPORT_SYMBOL(acpi_bus_can_wakeup);
346 
347 static void acpi_print_osc_error(acpi_handle handle,
348 	struct acpi_osc_context *context, char *error)
349 {
350 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
351 	int i;
352 
353 	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
354 		printk(KERN_DEBUG "%s\n", error);
355 	else {
356 		printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
357 		kfree(buffer.pointer);
358 	}
359 	printk(KERN_DEBUG"_OSC request data:");
360 	for (i = 0; i < context->cap.length; i += sizeof(u32))
361 		printk("%x ", *((u32 *)(context->cap.pointer + i)));
362 	printk("\n");
363 }
364 
365 static u8 hex_val(unsigned char c)
366 {
367 	return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
368 }
369 
370 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
371 {
372 	int i;
373 	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
374 		24, 26, 28, 30, 32, 34};
375 
376 	if (strlen(str) != 36)
377 		return AE_BAD_PARAMETER;
378 	for (i = 0; i < 36; i++) {
379 		if (i == 8 || i == 13 || i == 18 || i == 23) {
380 			if (str[i] != '-')
381 				return AE_BAD_PARAMETER;
382 		} else if (!isxdigit(str[i]))
383 			return AE_BAD_PARAMETER;
384 	}
385 	for (i = 0; i < 16; i++) {
386 		uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
387 		uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
388 	}
389 	return AE_OK;
390 }
391 
392 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
393 {
394 	acpi_status status;
395 	struct acpi_object_list input;
396 	union acpi_object in_params[4];
397 	union acpi_object *out_obj;
398 	u8 uuid[16];
399 	u32 errors;
400 	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
401 
402 	if (!context)
403 		return AE_ERROR;
404 	if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
405 		return AE_ERROR;
406 	context->ret.length = ACPI_ALLOCATE_BUFFER;
407 	context->ret.pointer = NULL;
408 
409 	/* Setting up input parameters */
410 	input.count = 4;
411 	input.pointer = in_params;
412 	in_params[0].type 		= ACPI_TYPE_BUFFER;
413 	in_params[0].buffer.length 	= 16;
414 	in_params[0].buffer.pointer	= uuid;
415 	in_params[1].type 		= ACPI_TYPE_INTEGER;
416 	in_params[1].integer.value 	= context->rev;
417 	in_params[2].type 		= ACPI_TYPE_INTEGER;
418 	in_params[2].integer.value	= context->cap.length/sizeof(u32);
419 	in_params[3].type		= ACPI_TYPE_BUFFER;
420 	in_params[3].buffer.length 	= context->cap.length;
421 	in_params[3].buffer.pointer 	= context->cap.pointer;
422 
423 	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
424 	if (ACPI_FAILURE(status))
425 		return status;
426 
427 	if (!output.length)
428 		return AE_NULL_OBJECT;
429 
430 	out_obj = output.pointer;
431 	if (out_obj->type != ACPI_TYPE_BUFFER
432 		|| out_obj->buffer.length != context->cap.length) {
433 		acpi_print_osc_error(handle, context,
434 			"_OSC evaluation returned wrong type");
435 		status = AE_TYPE;
436 		goto out_kfree;
437 	}
438 	/* Need to ignore the bit0 in result code */
439 	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
440 	if (errors) {
441 		if (errors & OSC_REQUEST_ERROR)
442 			acpi_print_osc_error(handle, context,
443 				"_OSC request failed");
444 		if (errors & OSC_INVALID_UUID_ERROR)
445 			acpi_print_osc_error(handle, context,
446 				"_OSC invalid UUID");
447 		if (errors & OSC_INVALID_REVISION_ERROR)
448 			acpi_print_osc_error(handle, context,
449 				"_OSC invalid revision");
450 		if (errors & OSC_CAPABILITIES_MASK_ERROR) {
451 			if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
452 			    & OSC_QUERY_ENABLE)
453 				goto out_success;
454 			status = AE_SUPPORT;
455 			goto out_kfree;
456 		}
457 		status = AE_ERROR;
458 		goto out_kfree;
459 	}
460 out_success:
461 	context->ret.length = out_obj->buffer.length;
462 	context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
463 	if (!context->ret.pointer) {
464 		status =  AE_NO_MEMORY;
465 		goto out_kfree;
466 	}
467 	memcpy(context->ret.pointer, out_obj->buffer.pointer,
468 		context->ret.length);
469 	status =  AE_OK;
470 
471 out_kfree:
472 	kfree(output.pointer);
473 	if (status != AE_OK)
474 		context->ret.pointer = NULL;
475 	return status;
476 }
477 EXPORT_SYMBOL(acpi_run_osc);
478 
479 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
480 static void acpi_bus_osc_support(void)
481 {
482 	u32 capbuf[2];
483 	struct acpi_osc_context context = {
484 		.uuid_str = sb_uuid_str,
485 		.rev = 1,
486 		.cap.length = 8,
487 		.cap.pointer = capbuf,
488 	};
489 	acpi_handle handle;
490 
491 	capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
492 	capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
493 #ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR
494 	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
495 #endif
496 	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
497 		return;
498 	if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
499 		kfree(context.ret.pointer);
500 	/* do we need to check the returned cap? Sounds no */
501 }
502 
503 /* --------------------------------------------------------------------------
504                                 Event Management
505    -------------------------------------------------------------------------- */
506 
507 #ifdef CONFIG_ACPI_PROC_EVENT
508 static DEFINE_SPINLOCK(acpi_bus_event_lock);
509 
510 LIST_HEAD(acpi_bus_event_list);
511 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
512 
513 extern int event_is_open;
514 
515 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
516 {
517 	struct acpi_bus_event *event;
518 	unsigned long flags = 0;
519 
520 	/* drop event on the floor if no one's listening */
521 	if (!event_is_open)
522 		return 0;
523 
524 	event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
525 	if (!event)
526 		return -ENOMEM;
527 
528 	strcpy(event->device_class, device_class);
529 	strcpy(event->bus_id, bus_id);
530 	event->type = type;
531 	event->data = data;
532 
533 	spin_lock_irqsave(&acpi_bus_event_lock, flags);
534 	list_add_tail(&event->node, &acpi_bus_event_list);
535 	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
536 
537 	wake_up_interruptible(&acpi_bus_event_queue);
538 
539 	return 0;
540 
541 }
542 
543 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
544 
545 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
546 {
547 	if (!device)
548 		return -EINVAL;
549 	return acpi_bus_generate_proc_event4(device->pnp.device_class,
550 					     device->pnp.bus_id, type, data);
551 }
552 
553 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
554 
555 int acpi_bus_receive_event(struct acpi_bus_event *event)
556 {
557 	unsigned long flags = 0;
558 	struct acpi_bus_event *entry = NULL;
559 
560 	DECLARE_WAITQUEUE(wait, current);
561 
562 
563 	if (!event)
564 		return -EINVAL;
565 
566 	if (list_empty(&acpi_bus_event_list)) {
567 
568 		set_current_state(TASK_INTERRUPTIBLE);
569 		add_wait_queue(&acpi_bus_event_queue, &wait);
570 
571 		if (list_empty(&acpi_bus_event_list))
572 			schedule();
573 
574 		remove_wait_queue(&acpi_bus_event_queue, &wait);
575 		set_current_state(TASK_RUNNING);
576 
577 		if (signal_pending(current))
578 			return -ERESTARTSYS;
579 	}
580 
581 	spin_lock_irqsave(&acpi_bus_event_lock, flags);
582 	if (!list_empty(&acpi_bus_event_list)) {
583 		entry = list_entry(acpi_bus_event_list.next,
584 				   struct acpi_bus_event, node);
585 		list_del(&entry->node);
586 	}
587 	spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
588 
589 	if (!entry)
590 		return -ENODEV;
591 
592 	memcpy(event, entry, sizeof(struct acpi_bus_event));
593 
594 	kfree(entry);
595 
596 	return 0;
597 }
598 
599 #endif	/* CONFIG_ACPI_PROC_EVENT */
600 
601 /* --------------------------------------------------------------------------
602                              Notification Handling
603    -------------------------------------------------------------------------- */
604 
605 static void acpi_bus_check_device(acpi_handle handle)
606 {
607 	struct acpi_device *device;
608 	acpi_status status;
609 	struct acpi_device_status old_status;
610 
611 	if (acpi_bus_get_device(handle, &device))
612 		return;
613 	if (!device)
614 		return;
615 
616 	old_status = device->status;
617 
618 	/*
619 	 * Make sure this device's parent is present before we go about
620 	 * messing with the device.
621 	 */
622 	if (device->parent && !device->parent->status.present) {
623 		device->status = device->parent->status;
624 		return;
625 	}
626 
627 	status = acpi_bus_get_status(device);
628 	if (ACPI_FAILURE(status))
629 		return;
630 
631 	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
632 		return;
633 
634 	/*
635 	 * Device Insertion/Removal
636 	 */
637 	if ((device->status.present) && !(old_status.present)) {
638 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
639 		/* TBD: Handle device insertion */
640 	} else if (!(device->status.present) && (old_status.present)) {
641 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
642 		/* TBD: Handle device removal */
643 	}
644 }
645 
646 static void acpi_bus_check_scope(acpi_handle handle)
647 {
648 	/* Status Change? */
649 	acpi_bus_check_device(handle);
650 
651 	/*
652 	 * TBD: Enumerate child devices within this device's scope and
653 	 *       run acpi_bus_check_device()'s on them.
654 	 */
655 }
656 
657 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
658 int register_acpi_bus_notifier(struct notifier_block *nb)
659 {
660 	return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
661 }
662 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
663 
664 void unregister_acpi_bus_notifier(struct notifier_block *nb)
665 {
666 	blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
667 }
668 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
669 
670 /**
671  * acpi_bus_notify
672  * ---------------
673  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
674  */
675 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
676 {
677 	struct acpi_device *device = NULL;
678 	struct acpi_driver *driver;
679 
680 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
681 			  type, handle));
682 
683 	blocking_notifier_call_chain(&acpi_bus_notify_list,
684 		type, (void *)handle);
685 
686 	switch (type) {
687 
688 	case ACPI_NOTIFY_BUS_CHECK:
689 		acpi_bus_check_scope(handle);
690 		/*
691 		 * TBD: We'll need to outsource certain events to non-ACPI
692 		 *      drivers via the device manager (device.c).
693 		 */
694 		break;
695 
696 	case ACPI_NOTIFY_DEVICE_CHECK:
697 		acpi_bus_check_device(handle);
698 		/*
699 		 * TBD: We'll need to outsource certain events to non-ACPI
700 		 *      drivers via the device manager (device.c).
701 		 */
702 		break;
703 
704 	case ACPI_NOTIFY_DEVICE_WAKE:
705 		/* TBD */
706 		break;
707 
708 	case ACPI_NOTIFY_EJECT_REQUEST:
709 		/* TBD */
710 		break;
711 
712 	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
713 		/* TBD: Exactly what does 'light' mean? */
714 		break;
715 
716 	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
717 		/* TBD */
718 		break;
719 
720 	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
721 		/* TBD */
722 		break;
723 
724 	case ACPI_NOTIFY_POWER_FAULT:
725 		/* TBD */
726 		break;
727 
728 	default:
729 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
730 				  "Received unknown/unsupported notification [%08x]\n",
731 				  type));
732 		break;
733 	}
734 
735 	acpi_bus_get_device(handle, &device);
736 	if (device) {
737 		driver = device->driver;
738 		if (driver && driver->ops.notify &&
739 		    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
740 			driver->ops.notify(device, type);
741 	}
742 }
743 
744 /* --------------------------------------------------------------------------
745                              Initialization/Cleanup
746    -------------------------------------------------------------------------- */
747 
748 static int __init acpi_bus_init_irq(void)
749 {
750 	acpi_status status = AE_OK;
751 	union acpi_object arg = { ACPI_TYPE_INTEGER };
752 	struct acpi_object_list arg_list = { 1, &arg };
753 	char *message = NULL;
754 
755 
756 	/*
757 	 * Let the system know what interrupt model we are using by
758 	 * evaluating the \_PIC object, if exists.
759 	 */
760 
761 	switch (acpi_irq_model) {
762 	case ACPI_IRQ_MODEL_PIC:
763 		message = "PIC";
764 		break;
765 	case ACPI_IRQ_MODEL_IOAPIC:
766 		message = "IOAPIC";
767 		break;
768 	case ACPI_IRQ_MODEL_IOSAPIC:
769 		message = "IOSAPIC";
770 		break;
771 	case ACPI_IRQ_MODEL_PLATFORM:
772 		message = "platform specific model";
773 		break;
774 	default:
775 		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
776 		return -ENODEV;
777 	}
778 
779 	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
780 
781 	arg.integer.value = acpi_irq_model;
782 
783 	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
784 	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
785 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
786 		return -ENODEV;
787 	}
788 
789 	return 0;
790 }
791 
792 u8 acpi_gbl_permanent_mmap;
793 
794 
795 void __init acpi_early_init(void)
796 {
797 	acpi_status status = AE_OK;
798 
799 	if (acpi_disabled)
800 		return;
801 
802 	printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
803 
804 	/* enable workarounds, unless strict ACPI spec. compliance */
805 	if (!acpi_strict)
806 		acpi_gbl_enable_interpreter_slack = TRUE;
807 
808 	acpi_gbl_permanent_mmap = 1;
809 
810 	status = acpi_reallocate_root_table();
811 	if (ACPI_FAILURE(status)) {
812 		printk(KERN_ERR PREFIX
813 		       "Unable to reallocate ACPI tables\n");
814 		goto error0;
815 	}
816 
817 	status = acpi_initialize_subsystem();
818 	if (ACPI_FAILURE(status)) {
819 		printk(KERN_ERR PREFIX
820 		       "Unable to initialize the ACPI Interpreter\n");
821 		goto error0;
822 	}
823 
824 	status = acpi_load_tables();
825 	if (ACPI_FAILURE(status)) {
826 		printk(KERN_ERR PREFIX
827 		       "Unable to load the System Description Tables\n");
828 		goto error0;
829 	}
830 
831 #ifdef CONFIG_X86
832 	if (!acpi_ioapic) {
833 		/* compatible (0) means level (3) */
834 		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
835 			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
836 			acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
837 		}
838 		/* Set PIC-mode SCI trigger type */
839 		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
840 					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
841 	} else {
842 		/*
843 		 * now that acpi_gbl_FADT is initialized,
844 		 * update it with result from INT_SRC_OVR parsing
845 		 */
846 		acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
847 	}
848 #endif
849 
850 	status =
851 	    acpi_enable_subsystem(~
852 				  (ACPI_NO_HARDWARE_INIT |
853 				   ACPI_NO_ACPI_ENABLE));
854 	if (ACPI_FAILURE(status)) {
855 		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
856 		goto error0;
857 	}
858 
859 	return;
860 
861       error0:
862 	disable_acpi();
863 	return;
864 }
865 
866 static int __init acpi_bus_init(void)
867 {
868 	int result = 0;
869 	acpi_status status = AE_OK;
870 	extern acpi_status acpi_os_initialize1(void);
871 
872 	acpi_os_initialize1();
873 
874 	status =
875 	    acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
876 	if (ACPI_FAILURE(status)) {
877 		printk(KERN_ERR PREFIX
878 		       "Unable to start the ACPI Interpreter\n");
879 		goto error1;
880 	}
881 
882 	/*
883 	 * ACPI 2.0 requires the EC driver to be loaded and work before
884 	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
885 	 * is called).
886 	 *
887 	 * This is accomplished by looking for the ECDT table, and getting
888 	 * the EC parameters out of that.
889 	 */
890 	status = acpi_ec_ecdt_probe();
891 	/* Ignore result. Not having an ECDT is not fatal. */
892 
893 	acpi_bus_osc_support();
894 
895 	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
896 	if (ACPI_FAILURE(status)) {
897 		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
898 		goto error1;
899 	}
900 
901 	acpi_early_processor_set_pdc();
902 
903 	/*
904 	 * Maybe EC region is required at bus_scan/acpi_get_devices. So it
905 	 * is necessary to enable it as early as possible.
906 	 */
907 	acpi_boot_ec_enable();
908 
909 	printk(KERN_INFO PREFIX "Interpreter enabled\n");
910 
911 	/* Initialize sleep structures */
912 	acpi_sleep_init();
913 
914 	/*
915 	 * Get the system interrupt model and evaluate \_PIC.
916 	 */
917 	result = acpi_bus_init_irq();
918 	if (result)
919 		goto error1;
920 
921 	/*
922 	 * Register the for all standard device notifications.
923 	 */
924 	status =
925 	    acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
926 					&acpi_bus_notify, NULL);
927 	if (ACPI_FAILURE(status)) {
928 		printk(KERN_ERR PREFIX
929 		       "Unable to register for device notifications\n");
930 		goto error1;
931 	}
932 
933 	/*
934 	 * Create the top ACPI proc directory
935 	 */
936 	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
937 
938 	return 0;
939 
940 	/* Mimic structured exception handling */
941       error1:
942 	acpi_terminate();
943 	return -ENODEV;
944 }
945 
946 struct kobject *acpi_kobj;
947 
948 static int __init acpi_init(void)
949 {
950 	int result = 0;
951 
952 
953 	if (acpi_disabled) {
954 		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
955 		return -ENODEV;
956 	}
957 
958 	acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
959 	if (!acpi_kobj) {
960 		printk(KERN_WARNING "%s: kset create error\n", __func__);
961 		acpi_kobj = NULL;
962 	}
963 
964 	init_acpi_device_notify();
965 	result = acpi_bus_init();
966 
967 	if (!result) {
968 		pci_mmcfg_late_init();
969 		if (!(pm_flags & PM_APM))
970 			pm_flags |= PM_ACPI;
971 		else {
972 			printk(KERN_INFO PREFIX
973 			       "APM is already active, exiting\n");
974 			disable_acpi();
975 			result = -ENODEV;
976 		}
977 	} else
978 		disable_acpi();
979 
980 	if (acpi_disabled)
981 		return result;
982 
983 	/*
984 	 * If the laptop falls into the DMI check table, the power state check
985 	 * will be disabled in the course of device power transistion.
986 	 */
987 	dmi_check_system(power_nocheck_dmi_table);
988 
989 	acpi_scan_init();
990 	acpi_ec_init();
991 	acpi_power_init();
992 	acpi_system_init();
993 	acpi_debug_init();
994 	acpi_sleep_proc_init();
995 	acpi_wakeup_device_init();
996 	return result;
997 }
998 
999 subsys_initcall(acpi_init);
1000