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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evxface - External interfaces for ACPI events | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2005, R. Byron Moore | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
44 | #include <linux/module.h> | |
45 | ||
46 | #include <acpi/acpi.h> | |
47 | #include <acpi/acnamesp.h> | |
48 | #include <acpi/acevents.h> | |
49 | #include <acpi/acinterp.h> | |
50 | ||
51 | #define _COMPONENT ACPI_EVENTS | |
4be44fcd | 52 | ACPI_MODULE_NAME("evxface") |
1da177e4 LT |
53 | |
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: acpi_install_exception_handler | |
57 | * | |
58 | * PARAMETERS: Handler - Pointer to the handler function for the | |
59 | * event | |
60 | * | |
61 | * RETURN: Status | |
62 | * | |
63 | * DESCRIPTION: Saves the pointer to the handler function | |
64 | * | |
65 | ******************************************************************************/ | |
66 | #ifdef ACPI_FUTURE_USAGE | |
4be44fcd | 67 | acpi_status acpi_install_exception_handler(acpi_exception_handler handler) |
1da177e4 | 68 | { |
4be44fcd | 69 | acpi_status status; |
1da177e4 | 70 | |
4be44fcd | 71 | ACPI_FUNCTION_TRACE("acpi_install_exception_handler"); |
1da177e4 | 72 | |
4be44fcd LB |
73 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
74 | if (ACPI_FAILURE(status)) { | |
75 | return_ACPI_STATUS(status); | |
1da177e4 LT |
76 | } |
77 | ||
78 | /* Don't allow two handlers. */ | |
79 | ||
80 | if (acpi_gbl_exception_handler) { | |
81 | status = AE_ALREADY_EXISTS; | |
82 | goto cleanup; | |
83 | } | |
84 | ||
85 | /* Install the handler */ | |
86 | ||
87 | acpi_gbl_exception_handler = handler; | |
88 | ||
4be44fcd LB |
89 | cleanup: |
90 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
91 | return_ACPI_STATUS(status); | |
1da177e4 | 92 | } |
4be44fcd | 93 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
94 | |
95 | /******************************************************************************* | |
96 | * | |
97 | * FUNCTION: acpi_install_fixed_event_handler | |
98 | * | |
99 | * PARAMETERS: Event - Event type to enable. | |
100 | * Handler - Pointer to the handler function for the | |
101 | * event | |
102 | * Context - Value passed to the handler on each GPE | |
103 | * | |
104 | * RETURN: Status | |
105 | * | |
106 | * DESCRIPTION: Saves the pointer to the handler function and then enables the | |
107 | * event. | |
108 | * | |
109 | ******************************************************************************/ | |
110 | ||
111 | acpi_status | |
4be44fcd LB |
112 | acpi_install_fixed_event_handler(u32 event, |
113 | acpi_event_handler handler, void *context) | |
1da177e4 | 114 | { |
4be44fcd | 115 | acpi_status status; |
1da177e4 | 116 | |
4be44fcd | 117 | ACPI_FUNCTION_TRACE("acpi_install_fixed_event_handler"); |
1da177e4 LT |
118 | |
119 | /* Parameter validation */ | |
120 | ||
121 | if (event > ACPI_EVENT_MAX) { | |
4be44fcd | 122 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
123 | } |
124 | ||
4be44fcd LB |
125 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
126 | if (ACPI_FAILURE(status)) { | |
127 | return_ACPI_STATUS(status); | |
1da177e4 LT |
128 | } |
129 | ||
130 | /* Don't allow two handlers. */ | |
131 | ||
132 | if (NULL != acpi_gbl_fixed_event_handlers[event].handler) { | |
133 | status = AE_ALREADY_EXISTS; | |
134 | goto cleanup; | |
135 | } | |
136 | ||
137 | /* Install the handler before enabling the event */ | |
138 | ||
139 | acpi_gbl_fixed_event_handlers[event].handler = handler; | |
140 | acpi_gbl_fixed_event_handlers[event].context = context; | |
141 | ||
4be44fcd | 142 | status = acpi_clear_event(event); |
1da177e4 | 143 | if (ACPI_SUCCESS(status)) |
4be44fcd LB |
144 | status = acpi_enable_event(event, 0); |
145 | if (ACPI_FAILURE(status)) { | |
146 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
147 | "Could not enable fixed event.\n")); | |
1da177e4 LT |
148 | |
149 | /* Remove the handler */ | |
150 | ||
151 | acpi_gbl_fixed_event_handlers[event].handler = NULL; | |
152 | acpi_gbl_fixed_event_handlers[event].context = NULL; | |
4be44fcd LB |
153 | } else { |
154 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
155 | "Enabled fixed event %X, Handler=%p\n", event, | |
156 | handler)); | |
1da177e4 LT |
157 | } |
158 | ||
4be44fcd LB |
159 | cleanup: |
160 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
161 | return_ACPI_STATUS(status); | |
1da177e4 | 162 | } |
1da177e4 | 163 | |
4be44fcd | 164 | EXPORT_SYMBOL(acpi_install_fixed_event_handler); |
1da177e4 LT |
165 | |
166 | /******************************************************************************* | |
167 | * | |
168 | * FUNCTION: acpi_remove_fixed_event_handler | |
169 | * | |
170 | * PARAMETERS: Event - Event type to disable. | |
171 | * Handler - Address of the handler | |
172 | * | |
173 | * RETURN: Status | |
174 | * | |
175 | * DESCRIPTION: Disables the event and unregisters the event handler. | |
176 | * | |
177 | ******************************************************************************/ | |
178 | ||
179 | acpi_status | |
4be44fcd | 180 | acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler) |
1da177e4 | 181 | { |
4be44fcd | 182 | acpi_status status = AE_OK; |
1da177e4 | 183 | |
4be44fcd | 184 | ACPI_FUNCTION_TRACE("acpi_remove_fixed_event_handler"); |
1da177e4 LT |
185 | |
186 | /* Parameter validation */ | |
187 | ||
188 | if (event > ACPI_EVENT_MAX) { | |
4be44fcd | 189 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
190 | } |
191 | ||
4be44fcd LB |
192 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
193 | if (ACPI_FAILURE(status)) { | |
194 | return_ACPI_STATUS(status); | |
1da177e4 LT |
195 | } |
196 | ||
197 | /* Disable the event before removing the handler */ | |
198 | ||
4be44fcd | 199 | status = acpi_disable_event(event, 0); |
1da177e4 LT |
200 | |
201 | /* Always Remove the handler */ | |
202 | ||
203 | acpi_gbl_fixed_event_handlers[event].handler = NULL; | |
204 | acpi_gbl_fixed_event_handlers[event].context = NULL; | |
205 | ||
4be44fcd LB |
206 | if (ACPI_FAILURE(status)) { |
207 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
208 | "Could not write to fixed event enable register.\n")); | |
209 | } else { | |
210 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X.\n", | |
211 | event)); | |
1da177e4 LT |
212 | } |
213 | ||
4be44fcd LB |
214 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
215 | return_ACPI_STATUS(status); | |
1da177e4 | 216 | } |
1da177e4 | 217 | |
4be44fcd | 218 | EXPORT_SYMBOL(acpi_remove_fixed_event_handler); |
1da177e4 LT |
219 | |
220 | /******************************************************************************* | |
221 | * | |
222 | * FUNCTION: acpi_install_notify_handler | |
223 | * | |
224 | * PARAMETERS: Device - The device for which notifies will be handled | |
225 | * handler_type - The type of handler: | |
226 | * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) | |
227 | * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) | |
228 | * ACPI_ALL_NOTIFY: both system and device | |
229 | * Handler - Address of the handler | |
230 | * Context - Value passed to the handler on each GPE | |
231 | * | |
232 | * RETURN: Status | |
233 | * | |
234 | * DESCRIPTION: Install a handler for notifies on an ACPI device | |
235 | * | |
236 | ******************************************************************************/ | |
237 | ||
238 | acpi_status | |
4be44fcd LB |
239 | acpi_install_notify_handler(acpi_handle device, |
240 | u32 handler_type, | |
241 | acpi_notify_handler handler, void *context) | |
1da177e4 | 242 | { |
4be44fcd LB |
243 | union acpi_operand_object *obj_desc; |
244 | union acpi_operand_object *notify_obj; | |
245 | struct acpi_namespace_node *node; | |
246 | acpi_status status; | |
1da177e4 | 247 | |
4be44fcd | 248 | ACPI_FUNCTION_TRACE("acpi_install_notify_handler"); |
1da177e4 LT |
249 | |
250 | /* Parameter validation */ | |
251 | ||
4be44fcd LB |
252 | if ((!device) || |
253 | (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { | |
254 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
255 | } |
256 | ||
4be44fcd LB |
257 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
258 | if (ACPI_FAILURE(status)) { | |
259 | return_ACPI_STATUS(status); | |
1da177e4 LT |
260 | } |
261 | ||
262 | /* Convert and validate the device handle */ | |
263 | ||
4be44fcd | 264 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
265 | if (!node) { |
266 | status = AE_BAD_PARAMETER; | |
267 | goto unlock_and_exit; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Root Object: | |
272 | * Registering a notify handler on the root object indicates that the | |
273 | * caller wishes to receive notifications for all objects. Note that | |
274 | * only one <external> global handler can be regsitered (per notify type). | |
275 | */ | |
276 | if (device == ACPI_ROOT_OBJECT) { | |
277 | /* Make sure the handler is not already installed */ | |
278 | ||
279 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
280 | acpi_gbl_system_notify.handler) || |
281 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
282 | acpi_gbl_device_notify.handler)) { | |
1da177e4 LT |
283 | status = AE_ALREADY_EXISTS; |
284 | goto unlock_and_exit; | |
285 | } | |
286 | ||
287 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
4be44fcd | 288 | acpi_gbl_system_notify.node = node; |
1da177e4 LT |
289 | acpi_gbl_system_notify.handler = handler; |
290 | acpi_gbl_system_notify.context = context; | |
291 | } | |
292 | ||
293 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
4be44fcd | 294 | acpi_gbl_device_notify.node = node; |
1da177e4 LT |
295 | acpi_gbl_device_notify.handler = handler; |
296 | acpi_gbl_device_notify.context = context; | |
297 | } | |
298 | ||
299 | /* Global notify handler installed */ | |
300 | } | |
301 | ||
302 | /* | |
303 | * All Other Objects: | |
304 | * Caller will only receive notifications specific to the target object. | |
305 | * Note that only certain object types can receive notifications. | |
306 | */ | |
307 | else { | |
308 | /* Notifies allowed on this object? */ | |
309 | ||
4be44fcd | 310 | if (!acpi_ev_is_notify_object(node)) { |
1da177e4 LT |
311 | status = AE_TYPE; |
312 | goto unlock_and_exit; | |
313 | } | |
314 | ||
315 | /* Check for an existing internal object */ | |
316 | ||
4be44fcd | 317 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
318 | if (obj_desc) { |
319 | /* Object exists - make sure there's no handler */ | |
320 | ||
321 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
322 | obj_desc->common_notify.system_notify) || |
323 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
324 | obj_desc->common_notify.device_notify)) { | |
1da177e4 LT |
325 | status = AE_ALREADY_EXISTS; |
326 | goto unlock_and_exit; | |
327 | } | |
4be44fcd | 328 | } else { |
1da177e4 LT |
329 | /* Create a new object */ |
330 | ||
4be44fcd | 331 | obj_desc = acpi_ut_create_internal_object(node->type); |
1da177e4 LT |
332 | if (!obj_desc) { |
333 | status = AE_NO_MEMORY; | |
334 | goto unlock_and_exit; | |
335 | } | |
336 | ||
337 | /* Attach new object to the Node */ | |
338 | ||
4be44fcd LB |
339 | status = |
340 | acpi_ns_attach_object(device, obj_desc, node->type); | |
1da177e4 LT |
341 | |
342 | /* Remove local reference to the object */ | |
343 | ||
4be44fcd LB |
344 | acpi_ut_remove_reference(obj_desc); |
345 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
346 | goto unlock_and_exit; |
347 | } | |
348 | } | |
349 | ||
350 | /* Install the handler */ | |
351 | ||
4be44fcd LB |
352 | notify_obj = |
353 | acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY); | |
1da177e4 LT |
354 | if (!notify_obj) { |
355 | status = AE_NO_MEMORY; | |
356 | goto unlock_and_exit; | |
357 | } | |
358 | ||
4be44fcd | 359 | notify_obj->notify.node = node; |
1da177e4 LT |
360 | notify_obj->notify.handler = handler; |
361 | notify_obj->notify.context = context; | |
362 | ||
363 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
364 | obj_desc->common_notify.system_notify = notify_obj; | |
365 | } | |
366 | ||
367 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
368 | obj_desc->common_notify.device_notify = notify_obj; | |
369 | } | |
370 | ||
371 | if (handler_type == ACPI_ALL_NOTIFY) { | |
372 | /* Extra ref if installed in both */ | |
373 | ||
4be44fcd | 374 | acpi_ut_add_reference(notify_obj); |
1da177e4 LT |
375 | } |
376 | } | |
377 | ||
4be44fcd LB |
378 | unlock_and_exit: |
379 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
380 | return_ACPI_STATUS(status); | |
1da177e4 | 381 | } |
1da177e4 | 382 | |
4be44fcd | 383 | EXPORT_SYMBOL(acpi_install_notify_handler); |
1da177e4 LT |
384 | |
385 | /******************************************************************************* | |
386 | * | |
387 | * FUNCTION: acpi_remove_notify_handler | |
388 | * | |
389 | * PARAMETERS: Device - The device for which notifies will be handled | |
390 | * handler_type - The type of handler: | |
391 | * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) | |
392 | * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) | |
393 | * ACPI_ALL_NOTIFY: both system and device | |
394 | * Handler - Address of the handler | |
395 | * | |
396 | * RETURN: Status | |
397 | * | |
398 | * DESCRIPTION: Remove a handler for notifies on an ACPI device | |
399 | * | |
400 | ******************************************************************************/ | |
401 | ||
402 | acpi_status | |
4be44fcd LB |
403 | acpi_remove_notify_handler(acpi_handle device, |
404 | u32 handler_type, acpi_notify_handler handler) | |
1da177e4 | 405 | { |
4be44fcd LB |
406 | union acpi_operand_object *notify_obj; |
407 | union acpi_operand_object *obj_desc; | |
408 | struct acpi_namespace_node *node; | |
409 | acpi_status status; | |
1da177e4 | 410 | |
4be44fcd | 411 | ACPI_FUNCTION_TRACE("acpi_remove_notify_handler"); |
1da177e4 LT |
412 | |
413 | /* Parameter validation */ | |
414 | ||
4be44fcd LB |
415 | if ((!device) || |
416 | (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { | |
417 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
418 | } |
419 | ||
4be44fcd LB |
420 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
421 | if (ACPI_FAILURE(status)) { | |
422 | return_ACPI_STATUS(status); | |
1da177e4 LT |
423 | } |
424 | ||
425 | /* Convert and validate the device handle */ | |
426 | ||
4be44fcd | 427 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
428 | if (!node) { |
429 | status = AE_BAD_PARAMETER; | |
430 | goto unlock_and_exit; | |
431 | } | |
432 | ||
433 | /* Root Object */ | |
434 | ||
435 | if (device == ACPI_ROOT_OBJECT) { | |
4be44fcd LB |
436 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
437 | "Removing notify handler for ROOT object.\n")); | |
1da177e4 LT |
438 | |
439 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
440 | !acpi_gbl_system_notify.handler) || |
441 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
442 | !acpi_gbl_device_notify.handler)) { | |
1da177e4 LT |
443 | status = AE_NOT_EXIST; |
444 | goto unlock_and_exit; | |
445 | } | |
446 | ||
447 | /* Make sure all deferred tasks are completed */ | |
448 | ||
4be44fcd | 449 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 450 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
451 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
452 | if (ACPI_FAILURE(status)) { | |
453 | return_ACPI_STATUS(status); | |
454 | } | |
1da177e4 LT |
455 | |
456 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
4be44fcd | 457 | acpi_gbl_system_notify.node = NULL; |
1da177e4 LT |
458 | acpi_gbl_system_notify.handler = NULL; |
459 | acpi_gbl_system_notify.context = NULL; | |
460 | } | |
461 | ||
462 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
4be44fcd | 463 | acpi_gbl_device_notify.node = NULL; |
1da177e4 LT |
464 | acpi_gbl_device_notify.handler = NULL; |
465 | acpi_gbl_device_notify.context = NULL; | |
466 | } | |
467 | } | |
468 | ||
469 | /* All Other Objects */ | |
470 | ||
471 | else { | |
472 | /* Notifies allowed on this object? */ | |
473 | ||
4be44fcd | 474 | if (!acpi_ev_is_notify_object(node)) { |
1da177e4 LT |
475 | status = AE_TYPE; |
476 | goto unlock_and_exit; | |
477 | } | |
478 | ||
479 | /* Check for an existing internal object */ | |
480 | ||
4be44fcd | 481 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
482 | if (!obj_desc) { |
483 | status = AE_NOT_EXIST; | |
484 | goto unlock_and_exit; | |
485 | } | |
486 | ||
487 | /* Object exists - make sure there's an existing handler */ | |
488 | ||
489 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
490 | notify_obj = obj_desc->common_notify.system_notify; | |
491 | if ((!notify_obj) || | |
4be44fcd | 492 | (notify_obj->notify.handler != handler)) { |
1da177e4 LT |
493 | status = AE_BAD_PARAMETER; |
494 | goto unlock_and_exit; | |
495 | } | |
496 | /* Make sure all deferred tasks are completed */ | |
497 | ||
4be44fcd | 498 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 499 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
500 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
501 | if (ACPI_FAILURE(status)) { | |
502 | return_ACPI_STATUS(status); | |
503 | } | |
1da177e4 LT |
504 | |
505 | /* Remove the handler */ | |
506 | obj_desc->common_notify.system_notify = NULL; | |
4be44fcd | 507 | acpi_ut_remove_reference(notify_obj); |
1da177e4 LT |
508 | } |
509 | ||
510 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
511 | notify_obj = obj_desc->common_notify.device_notify; | |
512 | if ((!notify_obj) || | |
4be44fcd | 513 | (notify_obj->notify.handler != handler)) { |
1da177e4 LT |
514 | status = AE_BAD_PARAMETER; |
515 | goto unlock_and_exit; | |
516 | } | |
517 | /* Make sure all deferred tasks are completed */ | |
518 | ||
4be44fcd | 519 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 520 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
521 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
522 | if (ACPI_FAILURE(status)) { | |
523 | return_ACPI_STATUS(status); | |
524 | } | |
1da177e4 LT |
525 | |
526 | /* Remove the handler */ | |
527 | obj_desc->common_notify.device_notify = NULL; | |
4be44fcd | 528 | acpi_ut_remove_reference(notify_obj); |
1da177e4 LT |
529 | } |
530 | } | |
531 | ||
4be44fcd LB |
532 | unlock_and_exit: |
533 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
534 | return_ACPI_STATUS(status); | |
1da177e4 | 535 | } |
1da177e4 | 536 | |
4be44fcd | 537 | EXPORT_SYMBOL(acpi_remove_notify_handler); |
1da177e4 LT |
538 | |
539 | /******************************************************************************* | |
540 | * | |
541 | * FUNCTION: acpi_install_gpe_handler | |
542 | * | |
44f6c012 RM |
543 | * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
544 | * defined GPEs) | |
545 | * gpe_number - The GPE number within the GPE block | |
1da177e4 LT |
546 | * Type - Whether this GPE should be treated as an |
547 | * edge- or level-triggered interrupt. | |
548 | * Address - Address of the handler | |
549 | * Context - Value passed to the handler on each GPE | |
550 | * | |
551 | * RETURN: Status | |
552 | * | |
553 | * DESCRIPTION: Install a handler for a General Purpose Event. | |
554 | * | |
555 | ******************************************************************************/ | |
556 | ||
557 | acpi_status | |
4be44fcd LB |
558 | acpi_install_gpe_handler(acpi_handle gpe_device, |
559 | u32 gpe_number, | |
560 | u32 type, acpi_event_handler address, void *context) | |
1da177e4 | 561 | { |
4be44fcd LB |
562 | struct acpi_gpe_event_info *gpe_event_info; |
563 | struct acpi_handler_info *handler; | |
564 | acpi_status status; | |
0897831b | 565 | acpi_native_uint flags; |
1da177e4 | 566 | |
4be44fcd | 567 | ACPI_FUNCTION_TRACE("acpi_install_gpe_handler"); |
1da177e4 LT |
568 | |
569 | /* Parameter validation */ | |
570 | ||
571 | if ((!address) || (type > ACPI_GPE_XRUPT_TYPE_MASK)) { | |
4be44fcd | 572 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
573 | } |
574 | ||
4be44fcd LB |
575 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
576 | if (ACPI_FAILURE(status)) { | |
577 | return_ACPI_STATUS(status); | |
1da177e4 LT |
578 | } |
579 | ||
580 | /* Ensure that we have a valid GPE number */ | |
581 | ||
4be44fcd | 582 | gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
1da177e4 LT |
583 | if (!gpe_event_info) { |
584 | status = AE_BAD_PARAMETER; | |
585 | goto unlock_and_exit; | |
586 | } | |
587 | ||
588 | /* Make sure that there isn't a handler there already */ | |
589 | ||
4be44fcd LB |
590 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == |
591 | ACPI_GPE_DISPATCH_HANDLER) { | |
1da177e4 LT |
592 | status = AE_ALREADY_EXISTS; |
593 | goto unlock_and_exit; | |
594 | } | |
595 | ||
596 | /* Allocate and init handler object */ | |
597 | ||
4be44fcd | 598 | handler = ACPI_MEM_CALLOCATE(sizeof(struct acpi_handler_info)); |
1da177e4 LT |
599 | if (!handler) { |
600 | status = AE_NO_MEMORY; | |
601 | goto unlock_and_exit; | |
602 | } | |
603 | ||
4be44fcd LB |
604 | handler->address = address; |
605 | handler->context = context; | |
1da177e4 LT |
606 | handler->method_node = gpe_event_info->dispatch.method_node; |
607 | ||
608 | /* Disable the GPE before installing the handler */ | |
609 | ||
4be44fcd LB |
610 | status = acpi_ev_disable_gpe(gpe_event_info); |
611 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
612 | goto unlock_and_exit; |
613 | } | |
614 | ||
615 | /* Install the handler */ | |
616 | ||
4be44fcd | 617 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
1da177e4 LT |
618 | gpe_event_info->dispatch.handler = handler; |
619 | ||
620 | /* Setup up dispatch flags to indicate handler (vs. method) */ | |
621 | ||
4be44fcd | 622 | gpe_event_info->flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); /* Clear bits */ |
1da177e4 LT |
623 | gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER); |
624 | ||
4be44fcd | 625 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 | 626 | |
4be44fcd LB |
627 | unlock_and_exit: |
628 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
629 | return_ACPI_STATUS(status); | |
1da177e4 | 630 | } |
1da177e4 | 631 | |
4be44fcd | 632 | EXPORT_SYMBOL(acpi_install_gpe_handler); |
1da177e4 LT |
633 | |
634 | /******************************************************************************* | |
635 | * | |
636 | * FUNCTION: acpi_remove_gpe_handler | |
637 | * | |
44f6c012 RM |
638 | * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
639 | * defined GPEs) | |
640 | * gpe_number - The event to remove a handler | |
1da177e4 LT |
641 | * Address - Address of the handler |
642 | * | |
643 | * RETURN: Status | |
644 | * | |
645 | * DESCRIPTION: Remove a handler for a General Purpose acpi_event. | |
646 | * | |
647 | ******************************************************************************/ | |
648 | ||
649 | acpi_status | |
4be44fcd LB |
650 | acpi_remove_gpe_handler(acpi_handle gpe_device, |
651 | u32 gpe_number, acpi_event_handler address) | |
1da177e4 | 652 | { |
4be44fcd LB |
653 | struct acpi_gpe_event_info *gpe_event_info; |
654 | struct acpi_handler_info *handler; | |
655 | acpi_status status; | |
0897831b | 656 | acpi_native_uint flags; |
1da177e4 | 657 | |
4be44fcd | 658 | ACPI_FUNCTION_TRACE("acpi_remove_gpe_handler"); |
1da177e4 LT |
659 | |
660 | /* Parameter validation */ | |
661 | ||
662 | if (!address) { | |
4be44fcd | 663 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
664 | } |
665 | ||
4be44fcd LB |
666 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
667 | if (ACPI_FAILURE(status)) { | |
668 | return_ACPI_STATUS(status); | |
1da177e4 LT |
669 | } |
670 | ||
671 | /* Ensure that we have a valid GPE number */ | |
672 | ||
4be44fcd | 673 | gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
1da177e4 LT |
674 | if (!gpe_event_info) { |
675 | status = AE_BAD_PARAMETER; | |
676 | goto unlock_and_exit; | |
677 | } | |
678 | ||
679 | /* Make sure that a handler is indeed installed */ | |
680 | ||
4be44fcd LB |
681 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) != |
682 | ACPI_GPE_DISPATCH_HANDLER) { | |
1da177e4 LT |
683 | status = AE_NOT_EXIST; |
684 | goto unlock_and_exit; | |
685 | } | |
686 | ||
687 | /* Make sure that the installed handler is the same */ | |
688 | ||
689 | if (gpe_event_info->dispatch.handler->address != address) { | |
690 | status = AE_BAD_PARAMETER; | |
691 | goto unlock_and_exit; | |
692 | } | |
693 | ||
694 | /* Disable the GPE before removing the handler */ | |
695 | ||
4be44fcd LB |
696 | status = acpi_ev_disable_gpe(gpe_event_info); |
697 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
698 | goto unlock_and_exit; |
699 | } | |
700 | ||
701 | /* Make sure all deferred tasks are completed */ | |
702 | ||
4be44fcd | 703 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
1da177e4 | 704 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
705 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
706 | if (ACPI_FAILURE(status)) { | |
707 | return_ACPI_STATUS(status); | |
708 | } | |
1da177e4 LT |
709 | |
710 | /* Remove the handler */ | |
711 | ||
4be44fcd | 712 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
1da177e4 LT |
713 | handler = gpe_event_info->dispatch.handler; |
714 | ||
715 | /* Restore Method node (if any), set dispatch flags */ | |
716 | ||
717 | gpe_event_info->dispatch.method_node = handler->method_node; | |
4be44fcd | 718 | gpe_event_info->flags &= ~ACPI_GPE_DISPATCH_MASK; /* Clear bits */ |
1da177e4 LT |
719 | if (handler->method_node) { |
720 | gpe_event_info->flags |= ACPI_GPE_DISPATCH_METHOD; | |
721 | } | |
4be44fcd | 722 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 LT |
723 | |
724 | /* Now we can free the handler object */ | |
725 | ||
4be44fcd | 726 | ACPI_MEM_FREE(handler); |
1da177e4 | 727 | |
4be44fcd LB |
728 | unlock_and_exit: |
729 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
730 | return_ACPI_STATUS(status); | |
1da177e4 | 731 | } |
1da177e4 | 732 | |
4be44fcd | 733 | EXPORT_SYMBOL(acpi_remove_gpe_handler); |
1da177e4 LT |
734 | |
735 | /******************************************************************************* | |
736 | * | |
737 | * FUNCTION: acpi_acquire_global_lock | |
738 | * | |
739 | * PARAMETERS: Timeout - How long the caller is willing to wait | |
44f6c012 RM |
740 | * Handle - Where the handle to the lock is returned |
741 | * (if acquired) | |
1da177e4 LT |
742 | * |
743 | * RETURN: Status | |
744 | * | |
745 | * DESCRIPTION: Acquire the ACPI Global Lock | |
746 | * | |
747 | ******************************************************************************/ | |
748 | ||
4be44fcd | 749 | acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle) |
1da177e4 | 750 | { |
4be44fcd | 751 | acpi_status status; |
1da177e4 LT |
752 | |
753 | if (!handle) { | |
754 | return (AE_BAD_PARAMETER); | |
755 | } | |
756 | ||
4be44fcd LB |
757 | status = acpi_ex_enter_interpreter(); |
758 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
759 | return (status); |
760 | } | |
761 | ||
4be44fcd LB |
762 | status = acpi_ev_acquire_global_lock(timeout); |
763 | acpi_ex_exit_interpreter(); | |
1da177e4 | 764 | |
4be44fcd | 765 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
766 | acpi_gbl_global_lock_handle++; |
767 | *handle = acpi_gbl_global_lock_handle; | |
768 | } | |
769 | ||
770 | return (status); | |
771 | } | |
1da177e4 | 772 | |
4be44fcd | 773 | EXPORT_SYMBOL(acpi_acquire_global_lock); |
1da177e4 LT |
774 | |
775 | /******************************************************************************* | |
776 | * | |
777 | * FUNCTION: acpi_release_global_lock | |
778 | * | |
779 | * PARAMETERS: Handle - Returned from acpi_acquire_global_lock | |
780 | * | |
781 | * RETURN: Status | |
782 | * | |
44f6c012 | 783 | * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid. |
1da177e4 LT |
784 | * |
785 | ******************************************************************************/ | |
786 | ||
4be44fcd | 787 | acpi_status acpi_release_global_lock(u32 handle) |
1da177e4 | 788 | { |
4be44fcd | 789 | acpi_status status; |
1da177e4 LT |
790 | |
791 | if (handle != acpi_gbl_global_lock_handle) { | |
792 | return (AE_NOT_ACQUIRED); | |
793 | } | |
794 | ||
4be44fcd | 795 | status = acpi_ev_release_global_lock(); |
1da177e4 LT |
796 | return (status); |
797 | } | |
1da177e4 | 798 | |
4be44fcd | 799 | EXPORT_SYMBOL(acpi_release_global_lock); |