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1da177e4 LT |
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/list.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/pm.h> | |
31 | #include <linux/device.h> | |
32 | #include <linux/proc_fs.h> | |
33 | #ifdef CONFIG_X86 | |
34 | #include <asm/mpspec.h> | |
35 | #endif | |
36 | #include <acpi/acpi_bus.h> | |
37 | #include <acpi/acpi_drivers.h> | |
38 | ||
39 | ||
40 | #define _COMPONENT ACPI_BUS_COMPONENT | |
41 | ACPI_MODULE_NAME ("acpi_bus") | |
42 | ||
43 | #ifdef CONFIG_X86 | |
44 | extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger); | |
45 | #endif | |
46 | ||
47 | FADT_DESCRIPTOR acpi_fadt; | |
48 | EXPORT_SYMBOL(acpi_fadt); | |
49 | ||
50 | struct acpi_device *acpi_root; | |
51 | struct proc_dir_entry *acpi_root_dir; | |
52 | EXPORT_SYMBOL(acpi_root_dir); | |
53 | ||
54 | #define STRUCT_TO_INT(s) (*((int*)&s)) | |
55 | ||
56 | /* -------------------------------------------------------------------------- | |
57 | Device Management | |
58 | -------------------------------------------------------------------------- */ | |
59 | ||
60 | int | |
61 | acpi_bus_get_device ( | |
62 | acpi_handle handle, | |
63 | struct acpi_device **device) | |
64 | { | |
65 | acpi_status status = AE_OK; | |
66 | ||
67 | ACPI_FUNCTION_TRACE("acpi_bus_get_device"); | |
68 | ||
69 | if (!device) | |
70 | return_VALUE(-EINVAL); | |
71 | ||
72 | /* TBD: Support fixed-feature devices */ | |
73 | ||
74 | status = acpi_get_data(handle, acpi_bus_data_handler, (void**) device); | |
75 | if (ACPI_FAILURE(status) || !*device) { | |
76 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "No context for object [%p]\n", | |
77 | handle)); | |
78 | return_VALUE(-ENODEV); | |
79 | } | |
80 | ||
81 | return_VALUE(0); | |
82 | } | |
83 | EXPORT_SYMBOL(acpi_bus_get_device); | |
84 | ||
85 | int | |
86 | acpi_bus_get_status ( | |
87 | struct acpi_device *device) | |
88 | { | |
89 | acpi_status status = AE_OK; | |
90 | unsigned long sta = 0; | |
91 | ||
92 | ACPI_FUNCTION_TRACE("acpi_bus_get_status"); | |
93 | ||
94 | if (!device) | |
95 | return_VALUE(-EINVAL); | |
96 | ||
97 | /* | |
98 | * Evaluate _STA if present. | |
99 | */ | |
100 | if (device->flags.dynamic_status) { | |
101 | status = acpi_evaluate_integer(device->handle, "_STA", NULL, &sta); | |
102 | if (ACPI_FAILURE(status)) | |
103 | return_VALUE(-ENODEV); | |
104 | STRUCT_TO_INT(device->status) = (int) sta; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Otherwise we assume the status of our parent (unless we don't | |
109 | * have one, in which case status is implied). | |
110 | */ | |
111 | else if (device->parent) | |
112 | device->status = device->parent->status; | |
113 | else | |
114 | STRUCT_TO_INT(device->status) = 0x0F; | |
115 | ||
116 | if (device->status.functional && !device->status.present) { | |
117 | printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: " | |
118 | "functional but not present; setting present\n", | |
119 | device->pnp.bus_id, | |
120 | (u32) STRUCT_TO_INT(device->status)); | |
121 | device->status.present = 1; | |
122 | } | |
123 | ||
124 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", | |
125 | device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status))); | |
126 | ||
127 | return_VALUE(0); | |
128 | } | |
129 | EXPORT_SYMBOL(acpi_bus_get_status); | |
130 | ||
131 | ||
132 | /* -------------------------------------------------------------------------- | |
133 | Power Management | |
134 | -------------------------------------------------------------------------- */ | |
135 | ||
136 | int | |
137 | acpi_bus_get_power ( | |
138 | acpi_handle handle, | |
139 | int *state) | |
140 | { | |
141 | int result = 0; | |
142 | acpi_status status = 0; | |
143 | struct acpi_device *device = NULL; | |
144 | unsigned long psc = 0; | |
145 | ||
146 | ACPI_FUNCTION_TRACE("acpi_bus_get_power"); | |
147 | ||
148 | result = acpi_bus_get_device(handle, &device); | |
149 | if (result) | |
150 | return_VALUE(result); | |
151 | ||
152 | *state = ACPI_STATE_UNKNOWN; | |
153 | ||
154 | if (!device->flags.power_manageable) { | |
155 | /* TBD: Non-recursive algorithm for walking up hierarchy */ | |
156 | if (device->parent) | |
157 | *state = device->parent->power.state; | |
158 | else | |
159 | *state = ACPI_STATE_D0; | |
160 | } | |
161 | else { | |
162 | /* | |
163 | * Get the device's power state either directly (via _PSC) or | |
164 | * indirectly (via power resources). | |
165 | */ | |
166 | if (device->power.flags.explicit_get) { | |
167 | status = acpi_evaluate_integer(device->handle, "_PSC", | |
168 | NULL, &psc); | |
169 | if (ACPI_FAILURE(status)) | |
170 | return_VALUE(-ENODEV); | |
171 | device->power.state = (int) psc; | |
172 | } | |
173 | else if (device->power.flags.power_resources) { | |
174 | result = acpi_power_get_inferred_state(device); | |
175 | if (result) | |
176 | return_VALUE(result); | |
177 | } | |
178 | ||
179 | *state = device->power.state; | |
180 | } | |
181 | ||
182 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n", | |
183 | device->pnp.bus_id, device->power.state)); | |
184 | ||
185 | return_VALUE(0); | |
186 | } | |
187 | EXPORT_SYMBOL(acpi_bus_get_power); | |
188 | ||
189 | ||
190 | int | |
191 | acpi_bus_set_power ( | |
192 | acpi_handle handle, | |
193 | int state) | |
194 | { | |
195 | int result = 0; | |
196 | acpi_status status = AE_OK; | |
197 | struct acpi_device *device = NULL; | |
198 | char object_name[5] = {'_','P','S','0'+state,'\0'}; | |
199 | ||
200 | ACPI_FUNCTION_TRACE("acpi_bus_set_power"); | |
201 | ||
202 | result = acpi_bus_get_device(handle, &device); | |
203 | if (result) | |
204 | return_VALUE(result); | |
205 | ||
206 | if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
207 | return_VALUE(-EINVAL); | |
208 | ||
209 | /* Make sure this is a valid target state */ | |
210 | ||
211 | if (!device->flags.power_manageable) { | |
212 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n")); | |
213 | return_VALUE(-ENODEV); | |
214 | } | |
b913100d DSL |
215 | /* |
216 | * Get device's current power state if it's unknown | |
217 | * This means device power state isn't initialized or previous setting failed | |
218 | */ | |
219 | if (device->power.state == ACPI_STATE_UNKNOWN) | |
220 | acpi_bus_get_power(device->handle, &device->power.state); | |
1da177e4 LT |
221 | if (state == device->power.state) { |
222 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state)); | |
223 | return_VALUE(0); | |
224 | } | |
225 | if (!device->power.states[state].flags.valid) { | |
226 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n", state)); | |
227 | return_VALUE(-ENODEV); | |
228 | } | |
229 | if (device->parent && (state < device->parent->power.state)) { | |
230 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Cannot set device to a higher-powered state than parent\n")); | |
231 | return_VALUE(-ENODEV); | |
232 | } | |
233 | ||
234 | /* | |
235 | * Transition Power | |
236 | * ---------------- | |
237 | * On transitions to a high-powered state we first apply power (via | |
238 | * power resources) then evalute _PSx. Conversly for transitions to | |
239 | * a lower-powered state. | |
b913100d | 240 | */ |
1da177e4 LT |
241 | if (state < device->power.state) { |
242 | if (device->power.flags.power_resources) { | |
243 | result = acpi_power_transition(device, state); | |
244 | if (result) | |
245 | goto end; | |
246 | } | |
247 | if (device->power.states[state].flags.explicit_set) { | |
248 | status = acpi_evaluate_object(device->handle, | |
249 | object_name, NULL, NULL); | |
250 | if (ACPI_FAILURE(status)) { | |
251 | result = -ENODEV; | |
252 | goto end; | |
253 | } | |
254 | } | |
255 | } | |
256 | else { | |
257 | if (device->power.states[state].flags.explicit_set) { | |
258 | status = acpi_evaluate_object(device->handle, | |
259 | object_name, NULL, NULL); | |
260 | if (ACPI_FAILURE(status)) { | |
261 | result = -ENODEV; | |
262 | goto end; | |
263 | } | |
264 | } | |
265 | if (device->power.flags.power_resources) { | |
266 | result = acpi_power_transition(device, state); | |
267 | if (result) | |
268 | goto end; | |
269 | } | |
270 | } | |
271 | ||
272 | end: | |
273 | if (result) | |
274 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error transitioning device [%s] to D%d\n", | |
275 | device->pnp.bus_id, state)); | |
276 | else | |
277 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to D%d\n", | |
278 | device->pnp.bus_id, state)); | |
279 | ||
280 | return_VALUE(result); | |
281 | } | |
282 | EXPORT_SYMBOL(acpi_bus_set_power); | |
283 | ||
284 | ||
285 | ||
286 | /* -------------------------------------------------------------------------- | |
287 | Event Management | |
288 | -------------------------------------------------------------------------- */ | |
289 | ||
290 | static DEFINE_SPINLOCK(acpi_bus_event_lock); | |
291 | ||
292 | LIST_HEAD(acpi_bus_event_list); | |
293 | DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); | |
294 | ||
295 | extern int event_is_open; | |
296 | ||
297 | int | |
298 | acpi_bus_generate_event ( | |
299 | struct acpi_device *device, | |
300 | u8 type, | |
301 | int data) | |
302 | { | |
303 | struct acpi_bus_event *event = NULL; | |
304 | unsigned long flags = 0; | |
305 | ||
306 | ACPI_FUNCTION_TRACE("acpi_bus_generate_event"); | |
307 | ||
308 | if (!device) | |
309 | return_VALUE(-EINVAL); | |
310 | ||
311 | /* drop event on the floor if no one's listening */ | |
312 | if (!event_is_open) | |
313 | return_VALUE(0); | |
314 | ||
315 | event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); | |
316 | if (!event) | |
317 | return_VALUE(-ENOMEM); | |
318 | ||
319 | strcpy(event->device_class, device->pnp.device_class); | |
320 | strcpy(event->bus_id, device->pnp.bus_id); | |
321 | event->type = type; | |
322 | event->data = data; | |
323 | ||
324 | spin_lock_irqsave(&acpi_bus_event_lock, flags); | |
325 | list_add_tail(&event->node, &acpi_bus_event_list); | |
326 | spin_unlock_irqrestore(&acpi_bus_event_lock, flags); | |
327 | ||
328 | wake_up_interruptible(&acpi_bus_event_queue); | |
329 | ||
330 | return_VALUE(0); | |
331 | } | |
332 | EXPORT_SYMBOL(acpi_bus_generate_event); | |
333 | ||
334 | int | |
335 | acpi_bus_receive_event ( | |
336 | struct acpi_bus_event *event) | |
337 | { | |
338 | unsigned long flags = 0; | |
339 | struct acpi_bus_event *entry = NULL; | |
340 | ||
341 | DECLARE_WAITQUEUE(wait, current); | |
342 | ||
343 | ACPI_FUNCTION_TRACE("acpi_bus_receive_event"); | |
344 | ||
345 | if (!event) | |
346 | return_VALUE(-EINVAL); | |
347 | ||
348 | if (list_empty(&acpi_bus_event_list)) { | |
349 | ||
350 | set_current_state(TASK_INTERRUPTIBLE); | |
351 | add_wait_queue(&acpi_bus_event_queue, &wait); | |
352 | ||
353 | if (list_empty(&acpi_bus_event_list)) | |
354 | schedule(); | |
355 | ||
356 | remove_wait_queue(&acpi_bus_event_queue, &wait); | |
357 | set_current_state(TASK_RUNNING); | |
358 | ||
359 | if (signal_pending(current)) | |
360 | return_VALUE(-ERESTARTSYS); | |
361 | } | |
362 | ||
363 | spin_lock_irqsave(&acpi_bus_event_lock, flags); | |
364 | entry = list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node); | |
365 | if (entry) | |
366 | list_del(&entry->node); | |
367 | spin_unlock_irqrestore(&acpi_bus_event_lock, flags); | |
368 | ||
369 | if (!entry) | |
370 | return_VALUE(-ENODEV); | |
371 | ||
372 | memcpy(event, entry, sizeof(struct acpi_bus_event)); | |
373 | ||
374 | kfree(entry); | |
375 | ||
376 | return_VALUE(0); | |
377 | } | |
378 | EXPORT_SYMBOL(acpi_bus_receive_event); | |
379 | ||
380 | ||
381 | /* -------------------------------------------------------------------------- | |
382 | Notification Handling | |
383 | -------------------------------------------------------------------------- */ | |
384 | ||
385 | static int | |
386 | acpi_bus_check_device ( | |
387 | struct acpi_device *device, | |
388 | int *status_changed) | |
389 | { | |
390 | acpi_status status = 0; | |
391 | struct acpi_device_status old_status; | |
392 | ||
393 | ACPI_FUNCTION_TRACE("acpi_bus_check_device"); | |
394 | ||
395 | if (!device) | |
396 | return_VALUE(-EINVAL); | |
397 | ||
398 | if (status_changed) | |
399 | *status_changed = 0; | |
400 | ||
401 | old_status = device->status; | |
402 | ||
403 | /* | |
404 | * Make sure this device's parent is present before we go about | |
405 | * messing with the device. | |
406 | */ | |
407 | if (device->parent && !device->parent->status.present) { | |
408 | device->status = device->parent->status; | |
409 | if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) { | |
410 | if (status_changed) | |
411 | *status_changed = 1; | |
412 | } | |
413 | return_VALUE(0); | |
414 | } | |
415 | ||
416 | status = acpi_bus_get_status(device); | |
417 | if (ACPI_FAILURE(status)) | |
418 | return_VALUE(-ENODEV); | |
419 | ||
420 | if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) | |
421 | return_VALUE(0); | |
422 | ||
423 | if (status_changed) | |
424 | *status_changed = 1; | |
425 | ||
426 | /* | |
427 | * Device Insertion/Removal | |
428 | */ | |
429 | if ((device->status.present) && !(old_status.present)) { | |
430 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); | |
431 | /* TBD: Handle device insertion */ | |
432 | } | |
433 | else if (!(device->status.present) && (old_status.present)) { | |
434 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); | |
435 | /* TBD: Handle device removal */ | |
436 | } | |
437 | ||
438 | return_VALUE(0); | |
439 | } | |
440 | ||
441 | ||
442 | static int | |
443 | acpi_bus_check_scope ( | |
444 | struct acpi_device *device) | |
445 | { | |
446 | int result = 0; | |
447 | int status_changed = 0; | |
448 | ||
449 | ACPI_FUNCTION_TRACE("acpi_bus_check_scope"); | |
450 | ||
451 | if (!device) | |
452 | return_VALUE(-EINVAL); | |
453 | ||
454 | /* Status Change? */ | |
455 | result = acpi_bus_check_device(device, &status_changed); | |
456 | if (result) | |
457 | return_VALUE(result); | |
458 | ||
459 | if (!status_changed) | |
460 | return_VALUE(0); | |
461 | ||
462 | /* | |
463 | * TBD: Enumerate child devices within this device's scope and | |
464 | * run acpi_bus_check_device()'s on them. | |
465 | */ | |
466 | ||
467 | return_VALUE(0); | |
468 | } | |
469 | ||
470 | ||
471 | /** | |
472 | * acpi_bus_notify | |
473 | * --------------- | |
474 | * Callback for all 'system-level' device notifications (values 0x00-0x7F). | |
475 | */ | |
476 | static void | |
477 | acpi_bus_notify ( | |
478 | acpi_handle handle, | |
479 | u32 type, | |
480 | void *data) | |
481 | { | |
482 | int result = 0; | |
483 | struct acpi_device *device = NULL; | |
484 | ||
485 | ACPI_FUNCTION_TRACE("acpi_bus_notify"); | |
486 | ||
487 | if (acpi_bus_get_device(handle, &device)) | |
488 | return_VOID; | |
489 | ||
490 | switch (type) { | |
491 | ||
492 | case ACPI_NOTIFY_BUS_CHECK: | |
493 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS CHECK notification for device [%s]\n", | |
494 | device->pnp.bus_id)); | |
495 | result = acpi_bus_check_scope(device); | |
496 | /* | |
497 | * TBD: We'll need to outsource certain events to non-ACPI | |
498 | * drivers via the device manager (device.c). | |
499 | */ | |
500 | break; | |
501 | ||
502 | case ACPI_NOTIFY_DEVICE_CHECK: | |
503 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK notification for device [%s]\n", | |
504 | device->pnp.bus_id)); | |
505 | result = acpi_bus_check_device(device, NULL); | |
506 | /* | |
507 | * TBD: We'll need to outsource certain events to non-ACPI | |
508 | * drivers via the device manager (device.c). | |
509 | */ | |
510 | break; | |
511 | ||
512 | case ACPI_NOTIFY_DEVICE_WAKE: | |
513 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE WAKE notification for device [%s]\n", | |
514 | device->pnp.bus_id)); | |
515 | /* TBD */ | |
516 | break; | |
517 | ||
518 | case ACPI_NOTIFY_EJECT_REQUEST: | |
519 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received EJECT REQUEST notification for device [%s]\n", | |
520 | device->pnp.bus_id)); | |
521 | /* TBD */ | |
522 | break; | |
523 | ||
524 | case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: | |
525 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK LIGHT notification for device [%s]\n", | |
526 | device->pnp.bus_id)); | |
527 | /* TBD: Exactly what does 'light' mean? */ | |
528 | break; | |
529 | ||
530 | case ACPI_NOTIFY_FREQUENCY_MISMATCH: | |
531 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received FREQUENCY MISMATCH notification for device [%s]\n", | |
532 | device->pnp.bus_id)); | |
533 | /* TBD */ | |
534 | break; | |
535 | ||
536 | case ACPI_NOTIFY_BUS_MODE_MISMATCH: | |
537 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS MODE MISMATCH notification for device [%s]\n", | |
538 | device->pnp.bus_id)); | |
539 | /* TBD */ | |
540 | break; | |
541 | ||
542 | case ACPI_NOTIFY_POWER_FAULT: | |
543 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received POWER FAULT notification for device [%s]\n", | |
544 | device->pnp.bus_id)); | |
545 | /* TBD */ | |
546 | break; | |
547 | ||
548 | default: | |
549 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n", | |
550 | type)); | |
551 | break; | |
552 | } | |
553 | ||
554 | return_VOID; | |
555 | } | |
556 | ||
557 | /* -------------------------------------------------------------------------- | |
558 | Initialization/Cleanup | |
559 | -------------------------------------------------------------------------- */ | |
560 | ||
561 | static int __init | |
562 | acpi_bus_init_irq (void) | |
563 | { | |
564 | acpi_status status = AE_OK; | |
565 | union acpi_object arg = {ACPI_TYPE_INTEGER}; | |
566 | struct acpi_object_list arg_list = {1, &arg}; | |
567 | char *message = NULL; | |
568 | ||
569 | ACPI_FUNCTION_TRACE("acpi_bus_init_irq"); | |
570 | ||
571 | /* | |
572 | * Let the system know what interrupt model we are using by | |
573 | * evaluating the \_PIC object, if exists. | |
574 | */ | |
575 | ||
576 | switch (acpi_irq_model) { | |
577 | case ACPI_IRQ_MODEL_PIC: | |
578 | message = "PIC"; | |
579 | break; | |
580 | case ACPI_IRQ_MODEL_IOAPIC: | |
581 | message = "IOAPIC"; | |
582 | break; | |
583 | case ACPI_IRQ_MODEL_IOSAPIC: | |
584 | message = "IOSAPIC"; | |
585 | break; | |
586 | default: | |
587 | printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); | |
588 | return_VALUE(-ENODEV); | |
589 | } | |
590 | ||
591 | printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); | |
592 | ||
593 | arg.integer.value = acpi_irq_model; | |
594 | ||
595 | status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); | |
596 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
597 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n")); | |
598 | return_VALUE(-ENODEV); | |
599 | } | |
600 | ||
601 | return_VALUE(0); | |
602 | } | |
603 | ||
604 | ||
605 | void __init | |
606 | acpi_early_init (void) | |
607 | { | |
608 | acpi_status status = AE_OK; | |
609 | struct acpi_buffer buffer = {sizeof(acpi_fadt), &acpi_fadt}; | |
610 | ||
611 | ACPI_FUNCTION_TRACE("acpi_early_init"); | |
612 | ||
613 | if (acpi_disabled) | |
614 | return_VOID; | |
615 | ||
616 | /* enable workarounds, unless strict ACPI spec. compliance */ | |
617 | if (!acpi_strict) | |
618 | acpi_gbl_enable_interpreter_slack = TRUE; | |
619 | ||
620 | status = acpi_initialize_subsystem(); | |
621 | if (ACPI_FAILURE(status)) { | |
622 | printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n"); | |
623 | goto error0; | |
624 | } | |
625 | ||
626 | status = acpi_load_tables(); | |
627 | if (ACPI_FAILURE(status)) { | |
628 | printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n"); | |
629 | goto error0; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Get a separate copy of the FADT for use by other drivers. | |
634 | */ | |
635 | status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer); | |
636 | if (ACPI_FAILURE(status)) { | |
637 | printk(KERN_ERR PREFIX "Unable to get the FADT\n"); | |
638 | goto error0; | |
639 | } | |
640 | ||
641 | #ifdef CONFIG_X86 | |
642 | if (!acpi_ioapic) { | |
643 | extern acpi_interrupt_flags acpi_sci_flags; | |
644 | ||
645 | /* compatible (0) means level (3) */ | |
646 | if (acpi_sci_flags.trigger == 0) | |
647 | acpi_sci_flags.trigger = 3; | |
648 | ||
649 | /* Set PIC-mode SCI trigger type */ | |
650 | acpi_pic_sci_set_trigger(acpi_fadt.sci_int, acpi_sci_flags.trigger); | |
651 | } else { | |
652 | extern int acpi_sci_override_gsi; | |
653 | /* | |
654 | * now that acpi_fadt is initialized, | |
655 | * update it with result from INT_SRC_OVR parsing | |
656 | */ | |
657 | acpi_fadt.sci_int = acpi_sci_override_gsi; | |
658 | } | |
659 | #endif | |
660 | ||
661 | status = acpi_enable_subsystem(~(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE)); | |
662 | if (ACPI_FAILURE(status)) { | |
663 | printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); | |
664 | goto error0; | |
665 | } | |
666 | ||
667 | return_VOID; | |
668 | ||
669 | error0: | |
670 | disable_acpi(); | |
671 | return_VOID; | |
672 | } | |
673 | ||
674 | static int __init | |
675 | acpi_bus_init (void) | |
676 | { | |
677 | int result = 0; | |
678 | acpi_status status = AE_OK; | |
679 | extern acpi_status acpi_os_initialize1(void); | |
680 | ||
681 | ACPI_FUNCTION_TRACE("acpi_bus_init"); | |
682 | ||
683 | status = acpi_os_initialize1(); | |
684 | ||
685 | status = acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE); | |
686 | if (ACPI_FAILURE(status)) { | |
687 | printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n"); | |
688 | goto error1; | |
689 | } | |
690 | ||
691 | if (ACPI_FAILURE(status)) { | |
692 | printk(KERN_ERR PREFIX "Unable to initialize ACPI OS objects\n"); | |
693 | goto error1; | |
694 | } | |
695 | #ifdef CONFIG_ACPI_EC | |
696 | /* | |
697 | * ACPI 2.0 requires the EC driver to be loaded and work before | |
698 | * the EC device is found in the namespace (i.e. before acpi_initialize_objects() | |
699 | * is called). | |
700 | * | |
701 | * This is accomplished by looking for the ECDT table, and getting | |
702 | * the EC parameters out of that. | |
703 | */ | |
704 | status = acpi_ec_ecdt_probe(); | |
705 | /* Ignore result. Not having an ECDT is not fatal. */ | |
706 | #endif | |
707 | ||
708 | status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); | |
709 | if (ACPI_FAILURE(status)) { | |
710 | printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); | |
711 | goto error1; | |
712 | } | |
713 | ||
714 | printk(KERN_INFO PREFIX "Interpreter enabled\n"); | |
715 | ||
716 | /* | |
717 | * Get the system interrupt model and evaluate \_PIC. | |
718 | */ | |
719 | result = acpi_bus_init_irq(); | |
720 | if (result) | |
721 | goto error1; | |
722 | ||
723 | /* | |
724 | * Register the for all standard device notifications. | |
725 | */ | |
726 | status = acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, &acpi_bus_notify, NULL); | |
727 | if (ACPI_FAILURE(status)) { | |
728 | printk(KERN_ERR PREFIX "Unable to register for device notifications\n"); | |
729 | goto error1; | |
730 | } | |
731 | ||
732 | /* | |
733 | * Create the top ACPI proc directory | |
734 | */ | |
735 | acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); | |
736 | ||
737 | return_VALUE(0); | |
738 | ||
739 | /* Mimic structured exception handling */ | |
740 | error1: | |
741 | acpi_terminate(); | |
742 | return_VALUE(-ENODEV); | |
743 | } | |
744 | ||
745 | decl_subsys(acpi,NULL,NULL); | |
746 | ||
747 | static int __init acpi_init (void) | |
748 | { | |
749 | int result = 0; | |
750 | ||
751 | ACPI_FUNCTION_TRACE("acpi_init"); | |
752 | ||
753 | printk(KERN_INFO PREFIX "Subsystem revision %08x\n", | |
754 | ACPI_CA_VERSION); | |
755 | ||
756 | if (acpi_disabled) { | |
757 | printk(KERN_INFO PREFIX "Interpreter disabled.\n"); | |
758 | return_VALUE(-ENODEV); | |
759 | } | |
760 | ||
761 | firmware_register(&acpi_subsys); | |
762 | ||
763 | result = acpi_bus_init(); | |
764 | ||
765 | if (!result) { | |
766 | #ifdef CONFIG_PM | |
767 | if (!PM_IS_ACTIVE()) | |
768 | pm_active = 1; | |
769 | else { | |
770 | printk(KERN_INFO PREFIX "APM is already active, exiting\n"); | |
771 | disable_acpi(); | |
772 | result = -ENODEV; | |
773 | } | |
774 | #endif | |
775 | } else | |
776 | disable_acpi(); | |
777 | ||
778 | return_VALUE(result); | |
779 | } | |
780 | ||
781 | subsys_initcall(acpi_init); |