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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evxface - External interfaces for ACPI events | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
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)) { | |
b8e4d893 BM |
146 | ACPI_WARNING((AE_INFO, "Could not enable fixed event %X", |
147 | event)); | |
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 | 206 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
207 | ACPI_WARNING((AE_INFO, |
208 | "Could not write to fixed event enable register %X", | |
209 | event)); | |
4be44fcd | 210 | } else { |
4a90c7e8 | 211 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n", |
4be44fcd | 212 | event)); |
1da177e4 LT |
213 | } |
214 | ||
4be44fcd LB |
215 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
216 | return_ACPI_STATUS(status); | |
1da177e4 | 217 | } |
1da177e4 | 218 | |
4be44fcd | 219 | EXPORT_SYMBOL(acpi_remove_fixed_event_handler); |
1da177e4 LT |
220 | |
221 | /******************************************************************************* | |
222 | * | |
223 | * FUNCTION: acpi_install_notify_handler | |
224 | * | |
225 | * PARAMETERS: Device - The device for which notifies will be handled | |
226 | * handler_type - The type of handler: | |
227 | * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) | |
228 | * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) | |
229 | * ACPI_ALL_NOTIFY: both system and device | |
230 | * Handler - Address of the handler | |
231 | * Context - Value passed to the handler on each GPE | |
232 | * | |
233 | * RETURN: Status | |
234 | * | |
235 | * DESCRIPTION: Install a handler for notifies on an ACPI device | |
236 | * | |
237 | ******************************************************************************/ | |
238 | ||
239 | acpi_status | |
4be44fcd LB |
240 | acpi_install_notify_handler(acpi_handle device, |
241 | u32 handler_type, | |
242 | acpi_notify_handler handler, void *context) | |
1da177e4 | 243 | { |
4be44fcd LB |
244 | union acpi_operand_object *obj_desc; |
245 | union acpi_operand_object *notify_obj; | |
246 | struct acpi_namespace_node *node; | |
247 | acpi_status status; | |
1da177e4 | 248 | |
4be44fcd | 249 | ACPI_FUNCTION_TRACE("acpi_install_notify_handler"); |
1da177e4 LT |
250 | |
251 | /* Parameter validation */ | |
252 | ||
4be44fcd LB |
253 | if ((!device) || |
254 | (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { | |
255 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
256 | } |
257 | ||
4be44fcd LB |
258 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
259 | if (ACPI_FAILURE(status)) { | |
260 | return_ACPI_STATUS(status); | |
1da177e4 LT |
261 | } |
262 | ||
263 | /* Convert and validate the device handle */ | |
264 | ||
4be44fcd | 265 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
266 | if (!node) { |
267 | status = AE_BAD_PARAMETER; | |
268 | goto unlock_and_exit; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Root Object: | |
273 | * Registering a notify handler on the root object indicates that the | |
274 | * caller wishes to receive notifications for all objects. Note that | |
275 | * only one <external> global handler can be regsitered (per notify type). | |
276 | */ | |
277 | if (device == ACPI_ROOT_OBJECT) { | |
278 | /* Make sure the handler is not already installed */ | |
279 | ||
280 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
281 | acpi_gbl_system_notify.handler) || |
282 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
283 | acpi_gbl_device_notify.handler)) { | |
1da177e4 LT |
284 | status = AE_ALREADY_EXISTS; |
285 | goto unlock_and_exit; | |
286 | } | |
287 | ||
288 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
4be44fcd | 289 | acpi_gbl_system_notify.node = node; |
1da177e4 LT |
290 | acpi_gbl_system_notify.handler = handler; |
291 | acpi_gbl_system_notify.context = context; | |
292 | } | |
293 | ||
294 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
4be44fcd | 295 | acpi_gbl_device_notify.node = node; |
1da177e4 LT |
296 | acpi_gbl_device_notify.handler = handler; |
297 | acpi_gbl_device_notify.context = context; | |
298 | } | |
299 | ||
300 | /* Global notify handler installed */ | |
301 | } | |
302 | ||
303 | /* | |
304 | * All Other Objects: | |
305 | * Caller will only receive notifications specific to the target object. | |
306 | * Note that only certain object types can receive notifications. | |
307 | */ | |
308 | else { | |
309 | /* Notifies allowed on this object? */ | |
310 | ||
4be44fcd | 311 | if (!acpi_ev_is_notify_object(node)) { |
1da177e4 LT |
312 | status = AE_TYPE; |
313 | goto unlock_and_exit; | |
314 | } | |
315 | ||
316 | /* Check for an existing internal object */ | |
317 | ||
4be44fcd | 318 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
319 | if (obj_desc) { |
320 | /* Object exists - make sure there's no handler */ | |
321 | ||
322 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
323 | obj_desc->common_notify.system_notify) || |
324 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
325 | obj_desc->common_notify.device_notify)) { | |
1da177e4 LT |
326 | status = AE_ALREADY_EXISTS; |
327 | goto unlock_and_exit; | |
328 | } | |
4be44fcd | 329 | } else { |
1da177e4 LT |
330 | /* Create a new object */ |
331 | ||
4be44fcd | 332 | obj_desc = acpi_ut_create_internal_object(node->type); |
1da177e4 LT |
333 | if (!obj_desc) { |
334 | status = AE_NO_MEMORY; | |
335 | goto unlock_and_exit; | |
336 | } | |
337 | ||
338 | /* Attach new object to the Node */ | |
339 | ||
4be44fcd LB |
340 | status = |
341 | acpi_ns_attach_object(device, obj_desc, node->type); | |
1da177e4 LT |
342 | |
343 | /* Remove local reference to the object */ | |
344 | ||
4be44fcd LB |
345 | acpi_ut_remove_reference(obj_desc); |
346 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
347 | goto unlock_and_exit; |
348 | } | |
349 | } | |
350 | ||
351 | /* Install the handler */ | |
352 | ||
4be44fcd LB |
353 | notify_obj = |
354 | acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY); | |
1da177e4 LT |
355 | if (!notify_obj) { |
356 | status = AE_NO_MEMORY; | |
357 | goto unlock_and_exit; | |
358 | } | |
359 | ||
4be44fcd | 360 | notify_obj->notify.node = node; |
1da177e4 LT |
361 | notify_obj->notify.handler = handler; |
362 | notify_obj->notify.context = context; | |
363 | ||
364 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
365 | obj_desc->common_notify.system_notify = notify_obj; | |
366 | } | |
367 | ||
368 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
369 | obj_desc->common_notify.device_notify = notify_obj; | |
370 | } | |
371 | ||
372 | if (handler_type == ACPI_ALL_NOTIFY) { | |
373 | /* Extra ref if installed in both */ | |
374 | ||
4be44fcd | 375 | acpi_ut_add_reference(notify_obj); |
1da177e4 LT |
376 | } |
377 | } | |
378 | ||
4be44fcd LB |
379 | unlock_and_exit: |
380 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
381 | return_ACPI_STATUS(status); | |
1da177e4 | 382 | } |
1da177e4 | 383 | |
4be44fcd | 384 | EXPORT_SYMBOL(acpi_install_notify_handler); |
1da177e4 LT |
385 | |
386 | /******************************************************************************* | |
387 | * | |
388 | * FUNCTION: acpi_remove_notify_handler | |
389 | * | |
390 | * PARAMETERS: Device - The device for which notifies will be handled | |
391 | * handler_type - The type of handler: | |
392 | * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) | |
393 | * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) | |
394 | * ACPI_ALL_NOTIFY: both system and device | |
395 | * Handler - Address of the handler | |
396 | * | |
397 | * RETURN: Status | |
398 | * | |
399 | * DESCRIPTION: Remove a handler for notifies on an ACPI device | |
400 | * | |
401 | ******************************************************************************/ | |
402 | ||
403 | acpi_status | |
4be44fcd LB |
404 | acpi_remove_notify_handler(acpi_handle device, |
405 | u32 handler_type, acpi_notify_handler handler) | |
1da177e4 | 406 | { |
4be44fcd LB |
407 | union acpi_operand_object *notify_obj; |
408 | union acpi_operand_object *obj_desc; | |
409 | struct acpi_namespace_node *node; | |
410 | acpi_status status; | |
1da177e4 | 411 | |
4be44fcd | 412 | ACPI_FUNCTION_TRACE("acpi_remove_notify_handler"); |
1da177e4 LT |
413 | |
414 | /* Parameter validation */ | |
415 | ||
4be44fcd LB |
416 | if ((!device) || |
417 | (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { | |
418 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
419 | } |
420 | ||
4be44fcd LB |
421 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
422 | if (ACPI_FAILURE(status)) { | |
423 | return_ACPI_STATUS(status); | |
1da177e4 LT |
424 | } |
425 | ||
426 | /* Convert and validate the device handle */ | |
427 | ||
4be44fcd | 428 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
429 | if (!node) { |
430 | status = AE_BAD_PARAMETER; | |
431 | goto unlock_and_exit; | |
432 | } | |
433 | ||
434 | /* Root Object */ | |
435 | ||
436 | if (device == ACPI_ROOT_OBJECT) { | |
4be44fcd | 437 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4a90c7e8 | 438 | "Removing notify handler for namespace root object\n")); |
1da177e4 LT |
439 | |
440 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
441 | !acpi_gbl_system_notify.handler) || |
442 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
443 | !acpi_gbl_device_notify.handler)) { | |
1da177e4 LT |
444 | status = AE_NOT_EXIST; |
445 | goto unlock_and_exit; | |
446 | } | |
447 | ||
448 | /* Make sure all deferred tasks are completed */ | |
449 | ||
4be44fcd | 450 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 451 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
452 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
453 | if (ACPI_FAILURE(status)) { | |
454 | return_ACPI_STATUS(status); | |
455 | } | |
1da177e4 LT |
456 | |
457 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
4be44fcd | 458 | acpi_gbl_system_notify.node = NULL; |
1da177e4 LT |
459 | acpi_gbl_system_notify.handler = NULL; |
460 | acpi_gbl_system_notify.context = NULL; | |
461 | } | |
462 | ||
463 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
4be44fcd | 464 | acpi_gbl_device_notify.node = NULL; |
1da177e4 LT |
465 | acpi_gbl_device_notify.handler = NULL; |
466 | acpi_gbl_device_notify.context = NULL; | |
467 | } | |
468 | } | |
469 | ||
470 | /* All Other Objects */ | |
471 | ||
472 | else { | |
473 | /* Notifies allowed on this object? */ | |
474 | ||
4be44fcd | 475 | if (!acpi_ev_is_notify_object(node)) { |
1da177e4 LT |
476 | status = AE_TYPE; |
477 | goto unlock_and_exit; | |
478 | } | |
479 | ||
480 | /* Check for an existing internal object */ | |
481 | ||
4be44fcd | 482 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
483 | if (!obj_desc) { |
484 | status = AE_NOT_EXIST; | |
485 | goto unlock_and_exit; | |
486 | } | |
487 | ||
488 | /* Object exists - make sure there's an existing handler */ | |
489 | ||
490 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
491 | notify_obj = obj_desc->common_notify.system_notify; | |
492 | if ((!notify_obj) || | |
4be44fcd | 493 | (notify_obj->notify.handler != handler)) { |
1da177e4 LT |
494 | status = AE_BAD_PARAMETER; |
495 | goto unlock_and_exit; | |
496 | } | |
497 | /* Make sure all deferred tasks are completed */ | |
498 | ||
4be44fcd | 499 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 500 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
501 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
502 | if (ACPI_FAILURE(status)) { | |
503 | return_ACPI_STATUS(status); | |
504 | } | |
1da177e4 LT |
505 | |
506 | /* Remove the handler */ | |
507 | obj_desc->common_notify.system_notify = NULL; | |
4be44fcd | 508 | acpi_ut_remove_reference(notify_obj); |
1da177e4 LT |
509 | } |
510 | ||
511 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
512 | notify_obj = obj_desc->common_notify.device_notify; | |
513 | if ((!notify_obj) || | |
4be44fcd | 514 | (notify_obj->notify.handler != handler)) { |
1da177e4 LT |
515 | status = AE_BAD_PARAMETER; |
516 | goto unlock_and_exit; | |
517 | } | |
518 | /* Make sure all deferred tasks are completed */ | |
519 | ||
4be44fcd | 520 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 521 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
522 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
523 | if (ACPI_FAILURE(status)) { | |
524 | return_ACPI_STATUS(status); | |
525 | } | |
1da177e4 LT |
526 | |
527 | /* Remove the handler */ | |
528 | obj_desc->common_notify.device_notify = NULL; | |
4be44fcd | 529 | acpi_ut_remove_reference(notify_obj); |
1da177e4 LT |
530 | } |
531 | } | |
532 | ||
4be44fcd LB |
533 | unlock_and_exit: |
534 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
535 | return_ACPI_STATUS(status); | |
1da177e4 | 536 | } |
1da177e4 | 537 | |
4be44fcd | 538 | EXPORT_SYMBOL(acpi_remove_notify_handler); |
1da177e4 LT |
539 | |
540 | /******************************************************************************* | |
541 | * | |
542 | * FUNCTION: acpi_install_gpe_handler | |
543 | * | |
44f6c012 RM |
544 | * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
545 | * defined GPEs) | |
546 | * gpe_number - The GPE number within the GPE block | |
1da177e4 LT |
547 | * Type - Whether this GPE should be treated as an |
548 | * edge- or level-triggered interrupt. | |
549 | * Address - Address of the handler | |
550 | * Context - Value passed to the handler on each GPE | |
551 | * | |
552 | * RETURN: Status | |
553 | * | |
554 | * DESCRIPTION: Install a handler for a General Purpose Event. | |
555 | * | |
556 | ******************************************************************************/ | |
557 | ||
558 | acpi_status | |
4be44fcd LB |
559 | acpi_install_gpe_handler(acpi_handle gpe_device, |
560 | u32 gpe_number, | |
561 | u32 type, acpi_event_handler address, void *context) | |
1da177e4 | 562 | { |
4be44fcd LB |
563 | struct acpi_gpe_event_info *gpe_event_info; |
564 | struct acpi_handler_info *handler; | |
565 | acpi_status status; | |
b8e4d893 | 566 | acpi_cpu_flags flags; |
1da177e4 | 567 | |
4be44fcd | 568 | ACPI_FUNCTION_TRACE("acpi_install_gpe_handler"); |
1da177e4 LT |
569 | |
570 | /* Parameter validation */ | |
571 | ||
572 | if ((!address) || (type > ACPI_GPE_XRUPT_TYPE_MASK)) { | |
4be44fcd | 573 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
574 | } |
575 | ||
4be44fcd LB |
576 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
577 | if (ACPI_FAILURE(status)) { | |
578 | return_ACPI_STATUS(status); | |
1da177e4 LT |
579 | } |
580 | ||
581 | /* Ensure that we have a valid GPE number */ | |
582 | ||
4be44fcd | 583 | gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
1da177e4 LT |
584 | if (!gpe_event_info) { |
585 | status = AE_BAD_PARAMETER; | |
586 | goto unlock_and_exit; | |
587 | } | |
588 | ||
589 | /* Make sure that there isn't a handler there already */ | |
590 | ||
4be44fcd LB |
591 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == |
592 | ACPI_GPE_DISPATCH_HANDLER) { | |
1da177e4 LT |
593 | status = AE_ALREADY_EXISTS; |
594 | goto unlock_and_exit; | |
595 | } | |
596 | ||
597 | /* Allocate and init handler object */ | |
598 | ||
4be44fcd | 599 | handler = ACPI_MEM_CALLOCATE(sizeof(struct acpi_handler_info)); |
1da177e4 LT |
600 | if (!handler) { |
601 | status = AE_NO_MEMORY; | |
602 | goto unlock_and_exit; | |
603 | } | |
604 | ||
4be44fcd LB |
605 | handler->address = address; |
606 | handler->context = context; | |
1da177e4 LT |
607 | handler->method_node = gpe_event_info->dispatch.method_node; |
608 | ||
609 | /* Disable the GPE before installing the handler */ | |
610 | ||
4be44fcd LB |
611 | status = acpi_ev_disable_gpe(gpe_event_info); |
612 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
613 | goto unlock_and_exit; |
614 | } | |
615 | ||
616 | /* Install the handler */ | |
617 | ||
4be44fcd | 618 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
1da177e4 LT |
619 | gpe_event_info->dispatch.handler = handler; |
620 | ||
621 | /* Setup up dispatch flags to indicate handler (vs. method) */ | |
622 | ||
4be44fcd | 623 | gpe_event_info->flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); /* Clear bits */ |
1da177e4 LT |
624 | gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER); |
625 | ||
4be44fcd | 626 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 | 627 | |
4be44fcd LB |
628 | unlock_and_exit: |
629 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
630 | return_ACPI_STATUS(status); | |
1da177e4 | 631 | } |
1da177e4 | 632 | |
4be44fcd | 633 | EXPORT_SYMBOL(acpi_install_gpe_handler); |
1da177e4 LT |
634 | |
635 | /******************************************************************************* | |
636 | * | |
637 | * FUNCTION: acpi_remove_gpe_handler | |
638 | * | |
44f6c012 RM |
639 | * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
640 | * defined GPEs) | |
641 | * gpe_number - The event to remove a handler | |
1da177e4 LT |
642 | * Address - Address of the handler |
643 | * | |
644 | * RETURN: Status | |
645 | * | |
646 | * DESCRIPTION: Remove a handler for a General Purpose acpi_event. | |
647 | * | |
648 | ******************************************************************************/ | |
649 | ||
650 | acpi_status | |
4be44fcd LB |
651 | acpi_remove_gpe_handler(acpi_handle gpe_device, |
652 | u32 gpe_number, acpi_event_handler address) | |
1da177e4 | 653 | { |
4be44fcd LB |
654 | struct acpi_gpe_event_info *gpe_event_info; |
655 | struct acpi_handler_info *handler; | |
656 | acpi_status status; | |
b8e4d893 | 657 | acpi_cpu_flags flags; |
1da177e4 | 658 | |
4be44fcd | 659 | ACPI_FUNCTION_TRACE("acpi_remove_gpe_handler"); |
1da177e4 LT |
660 | |
661 | /* Parameter validation */ | |
662 | ||
663 | if (!address) { | |
4be44fcd | 664 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
665 | } |
666 | ||
4be44fcd LB |
667 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
668 | if (ACPI_FAILURE(status)) { | |
669 | return_ACPI_STATUS(status); | |
1da177e4 LT |
670 | } |
671 | ||
672 | /* Ensure that we have a valid GPE number */ | |
673 | ||
4be44fcd | 674 | gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
1da177e4 LT |
675 | if (!gpe_event_info) { |
676 | status = AE_BAD_PARAMETER; | |
677 | goto unlock_and_exit; | |
678 | } | |
679 | ||
680 | /* Make sure that a handler is indeed installed */ | |
681 | ||
4be44fcd LB |
682 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) != |
683 | ACPI_GPE_DISPATCH_HANDLER) { | |
1da177e4 LT |
684 | status = AE_NOT_EXIST; |
685 | goto unlock_and_exit; | |
686 | } | |
687 | ||
688 | /* Make sure that the installed handler is the same */ | |
689 | ||
690 | if (gpe_event_info->dispatch.handler->address != address) { | |
691 | status = AE_BAD_PARAMETER; | |
692 | goto unlock_and_exit; | |
693 | } | |
694 | ||
695 | /* Disable the GPE before removing the handler */ | |
696 | ||
4be44fcd LB |
697 | status = acpi_ev_disable_gpe(gpe_event_info); |
698 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
699 | goto unlock_and_exit; |
700 | } | |
701 | ||
702 | /* Make sure all deferred tasks are completed */ | |
703 | ||
4be44fcd | 704 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
1da177e4 | 705 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
706 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
707 | if (ACPI_FAILURE(status)) { | |
708 | return_ACPI_STATUS(status); | |
709 | } | |
1da177e4 LT |
710 | |
711 | /* Remove the handler */ | |
712 | ||
4be44fcd | 713 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
1da177e4 LT |
714 | handler = gpe_event_info->dispatch.handler; |
715 | ||
716 | /* Restore Method node (if any), set dispatch flags */ | |
717 | ||
718 | gpe_event_info->dispatch.method_node = handler->method_node; | |
4be44fcd | 719 | gpe_event_info->flags &= ~ACPI_GPE_DISPATCH_MASK; /* Clear bits */ |
1da177e4 LT |
720 | if (handler->method_node) { |
721 | gpe_event_info->flags |= ACPI_GPE_DISPATCH_METHOD; | |
722 | } | |
4be44fcd | 723 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 LT |
724 | |
725 | /* Now we can free the handler object */ | |
726 | ||
4be44fcd | 727 | ACPI_MEM_FREE(handler); |
1da177e4 | 728 | |
4be44fcd LB |
729 | unlock_and_exit: |
730 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
731 | return_ACPI_STATUS(status); | |
1da177e4 | 732 | } |
1da177e4 | 733 | |
4be44fcd | 734 | EXPORT_SYMBOL(acpi_remove_gpe_handler); |
1da177e4 LT |
735 | |
736 | /******************************************************************************* | |
737 | * | |
738 | * FUNCTION: acpi_acquire_global_lock | |
739 | * | |
740 | * PARAMETERS: Timeout - How long the caller is willing to wait | |
44f6c012 RM |
741 | * Handle - Where the handle to the lock is returned |
742 | * (if acquired) | |
1da177e4 LT |
743 | * |
744 | * RETURN: Status | |
745 | * | |
746 | * DESCRIPTION: Acquire the ACPI Global Lock | |
747 | * | |
748 | ******************************************************************************/ | |
749 | ||
4be44fcd | 750 | acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle) |
1da177e4 | 751 | { |
4be44fcd | 752 | acpi_status status; |
1da177e4 LT |
753 | |
754 | if (!handle) { | |
755 | return (AE_BAD_PARAMETER); | |
756 | } | |
757 | ||
4be44fcd LB |
758 | status = acpi_ex_enter_interpreter(); |
759 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
760 | return (status); |
761 | } | |
762 | ||
4be44fcd LB |
763 | status = acpi_ev_acquire_global_lock(timeout); |
764 | acpi_ex_exit_interpreter(); | |
1da177e4 | 765 | |
4be44fcd | 766 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
767 | acpi_gbl_global_lock_handle++; |
768 | *handle = acpi_gbl_global_lock_handle; | |
769 | } | |
770 | ||
771 | return (status); | |
772 | } | |
1da177e4 | 773 | |
4be44fcd | 774 | EXPORT_SYMBOL(acpi_acquire_global_lock); |
1da177e4 LT |
775 | |
776 | /******************************************************************************* | |
777 | * | |
778 | * FUNCTION: acpi_release_global_lock | |
779 | * | |
780 | * PARAMETERS: Handle - Returned from acpi_acquire_global_lock | |
781 | * | |
782 | * RETURN: Status | |
783 | * | |
44f6c012 | 784 | * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid. |
1da177e4 LT |
785 | * |
786 | ******************************************************************************/ | |
787 | ||
4be44fcd | 788 | acpi_status acpi_release_global_lock(u32 handle) |
1da177e4 | 789 | { |
4be44fcd | 790 | acpi_status status; |
1da177e4 LT |
791 | |
792 | if (handle != acpi_gbl_global_lock_handle) { | |
793 | return (AE_NOT_ACQUIRED); | |
794 | } | |
795 | ||
4be44fcd | 796 | status = acpi_ev_release_global_lock(); |
1da177e4 LT |
797 | return (status); |
798 | } | |
1da177e4 | 799 | |
4be44fcd | 800 | EXPORT_SYMBOL(acpi_release_global_lock); |