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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)) { | |
4a90c7e8 BM |
146 | ACPI_REPORT_WARNING(("Could not enable fixed event %X\n", |
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)) { |
4a90c7e8 | 207 | ACPI_REPORT_WARNING(("Could not write to fixed event enable register %X\n", event)); |
4be44fcd | 208 | } else { |
4a90c7e8 | 209 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n", |
4be44fcd | 210 | event)); |
1da177e4 LT |
211 | } |
212 | ||
4be44fcd LB |
213 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
214 | return_ACPI_STATUS(status); | |
1da177e4 | 215 | } |
1da177e4 | 216 | |
4be44fcd | 217 | EXPORT_SYMBOL(acpi_remove_fixed_event_handler); |
1da177e4 LT |
218 | |
219 | /******************************************************************************* | |
220 | * | |
221 | * FUNCTION: acpi_install_notify_handler | |
222 | * | |
223 | * PARAMETERS: Device - The device for which notifies will be handled | |
224 | * handler_type - The type of handler: | |
225 | * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) | |
226 | * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) | |
227 | * ACPI_ALL_NOTIFY: both system and device | |
228 | * Handler - Address of the handler | |
229 | * Context - Value passed to the handler on each GPE | |
230 | * | |
231 | * RETURN: Status | |
232 | * | |
233 | * DESCRIPTION: Install a handler for notifies on an ACPI device | |
234 | * | |
235 | ******************************************************************************/ | |
236 | ||
237 | acpi_status | |
4be44fcd LB |
238 | acpi_install_notify_handler(acpi_handle device, |
239 | u32 handler_type, | |
240 | acpi_notify_handler handler, void *context) | |
1da177e4 | 241 | { |
4be44fcd LB |
242 | union acpi_operand_object *obj_desc; |
243 | union acpi_operand_object *notify_obj; | |
244 | struct acpi_namespace_node *node; | |
245 | acpi_status status; | |
1da177e4 | 246 | |
4be44fcd | 247 | ACPI_FUNCTION_TRACE("acpi_install_notify_handler"); |
1da177e4 LT |
248 | |
249 | /* Parameter validation */ | |
250 | ||
4be44fcd LB |
251 | if ((!device) || |
252 | (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { | |
253 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
254 | } |
255 | ||
4be44fcd LB |
256 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
257 | if (ACPI_FAILURE(status)) { | |
258 | return_ACPI_STATUS(status); | |
1da177e4 LT |
259 | } |
260 | ||
261 | /* Convert and validate the device handle */ | |
262 | ||
4be44fcd | 263 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
264 | if (!node) { |
265 | status = AE_BAD_PARAMETER; | |
266 | goto unlock_and_exit; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Root Object: | |
271 | * Registering a notify handler on the root object indicates that the | |
272 | * caller wishes to receive notifications for all objects. Note that | |
273 | * only one <external> global handler can be regsitered (per notify type). | |
274 | */ | |
275 | if (device == ACPI_ROOT_OBJECT) { | |
276 | /* Make sure the handler is not already installed */ | |
277 | ||
278 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
279 | acpi_gbl_system_notify.handler) || |
280 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
281 | acpi_gbl_device_notify.handler)) { | |
1da177e4 LT |
282 | status = AE_ALREADY_EXISTS; |
283 | goto unlock_and_exit; | |
284 | } | |
285 | ||
286 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
4be44fcd | 287 | acpi_gbl_system_notify.node = node; |
1da177e4 LT |
288 | acpi_gbl_system_notify.handler = handler; |
289 | acpi_gbl_system_notify.context = context; | |
290 | } | |
291 | ||
292 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
4be44fcd | 293 | acpi_gbl_device_notify.node = node; |
1da177e4 LT |
294 | acpi_gbl_device_notify.handler = handler; |
295 | acpi_gbl_device_notify.context = context; | |
296 | } | |
297 | ||
298 | /* Global notify handler installed */ | |
299 | } | |
300 | ||
301 | /* | |
302 | * All Other Objects: | |
303 | * Caller will only receive notifications specific to the target object. | |
304 | * Note that only certain object types can receive notifications. | |
305 | */ | |
306 | else { | |
307 | /* Notifies allowed on this object? */ | |
308 | ||
4be44fcd | 309 | if (!acpi_ev_is_notify_object(node)) { |
1da177e4 LT |
310 | status = AE_TYPE; |
311 | goto unlock_and_exit; | |
312 | } | |
313 | ||
314 | /* Check for an existing internal object */ | |
315 | ||
4be44fcd | 316 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
317 | if (obj_desc) { |
318 | /* Object exists - make sure there's no handler */ | |
319 | ||
320 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
321 | obj_desc->common_notify.system_notify) || |
322 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
323 | obj_desc->common_notify.device_notify)) { | |
1da177e4 LT |
324 | status = AE_ALREADY_EXISTS; |
325 | goto unlock_and_exit; | |
326 | } | |
4be44fcd | 327 | } else { |
1da177e4 LT |
328 | /* Create a new object */ |
329 | ||
4be44fcd | 330 | obj_desc = acpi_ut_create_internal_object(node->type); |
1da177e4 LT |
331 | if (!obj_desc) { |
332 | status = AE_NO_MEMORY; | |
333 | goto unlock_and_exit; | |
334 | } | |
335 | ||
336 | /* Attach new object to the Node */ | |
337 | ||
4be44fcd LB |
338 | status = |
339 | acpi_ns_attach_object(device, obj_desc, node->type); | |
1da177e4 LT |
340 | |
341 | /* Remove local reference to the object */ | |
342 | ||
4be44fcd LB |
343 | acpi_ut_remove_reference(obj_desc); |
344 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
345 | goto unlock_and_exit; |
346 | } | |
347 | } | |
348 | ||
349 | /* Install the handler */ | |
350 | ||
4be44fcd LB |
351 | notify_obj = |
352 | acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY); | |
1da177e4 LT |
353 | if (!notify_obj) { |
354 | status = AE_NO_MEMORY; | |
355 | goto unlock_and_exit; | |
356 | } | |
357 | ||
4be44fcd | 358 | notify_obj->notify.node = node; |
1da177e4 LT |
359 | notify_obj->notify.handler = handler; |
360 | notify_obj->notify.context = context; | |
361 | ||
362 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
363 | obj_desc->common_notify.system_notify = notify_obj; | |
364 | } | |
365 | ||
366 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
367 | obj_desc->common_notify.device_notify = notify_obj; | |
368 | } | |
369 | ||
370 | if (handler_type == ACPI_ALL_NOTIFY) { | |
371 | /* Extra ref if installed in both */ | |
372 | ||
4be44fcd | 373 | acpi_ut_add_reference(notify_obj); |
1da177e4 LT |
374 | } |
375 | } | |
376 | ||
4be44fcd LB |
377 | unlock_and_exit: |
378 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
379 | return_ACPI_STATUS(status); | |
1da177e4 | 380 | } |
1da177e4 | 381 | |
4be44fcd | 382 | EXPORT_SYMBOL(acpi_install_notify_handler); |
1da177e4 LT |
383 | |
384 | /******************************************************************************* | |
385 | * | |
386 | * FUNCTION: acpi_remove_notify_handler | |
387 | * | |
388 | * PARAMETERS: Device - The device for which notifies will be handled | |
389 | * handler_type - The type of handler: | |
390 | * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) | |
391 | * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) | |
392 | * ACPI_ALL_NOTIFY: both system and device | |
393 | * Handler - Address of the handler | |
394 | * | |
395 | * RETURN: Status | |
396 | * | |
397 | * DESCRIPTION: Remove a handler for notifies on an ACPI device | |
398 | * | |
399 | ******************************************************************************/ | |
400 | ||
401 | acpi_status | |
4be44fcd LB |
402 | acpi_remove_notify_handler(acpi_handle device, |
403 | u32 handler_type, acpi_notify_handler handler) | |
1da177e4 | 404 | { |
4be44fcd LB |
405 | union acpi_operand_object *notify_obj; |
406 | union acpi_operand_object *obj_desc; | |
407 | struct acpi_namespace_node *node; | |
408 | acpi_status status; | |
1da177e4 | 409 | |
4be44fcd | 410 | ACPI_FUNCTION_TRACE("acpi_remove_notify_handler"); |
1da177e4 LT |
411 | |
412 | /* Parameter validation */ | |
413 | ||
4be44fcd LB |
414 | if ((!device) || |
415 | (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { | |
416 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
417 | } |
418 | ||
4be44fcd LB |
419 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
420 | if (ACPI_FAILURE(status)) { | |
421 | return_ACPI_STATUS(status); | |
1da177e4 LT |
422 | } |
423 | ||
424 | /* Convert and validate the device handle */ | |
425 | ||
4be44fcd | 426 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
427 | if (!node) { |
428 | status = AE_BAD_PARAMETER; | |
429 | goto unlock_and_exit; | |
430 | } | |
431 | ||
432 | /* Root Object */ | |
433 | ||
434 | if (device == ACPI_ROOT_OBJECT) { | |
4be44fcd | 435 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4a90c7e8 | 436 | "Removing notify handler for namespace root object\n")); |
1da177e4 LT |
437 | |
438 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
439 | !acpi_gbl_system_notify.handler) || |
440 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
441 | !acpi_gbl_device_notify.handler)) { | |
1da177e4 LT |
442 | status = AE_NOT_EXIST; |
443 | goto unlock_and_exit; | |
444 | } | |
445 | ||
446 | /* Make sure all deferred tasks are completed */ | |
447 | ||
4be44fcd | 448 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 449 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
450 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
451 | if (ACPI_FAILURE(status)) { | |
452 | return_ACPI_STATUS(status); | |
453 | } | |
1da177e4 LT |
454 | |
455 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
4be44fcd | 456 | acpi_gbl_system_notify.node = NULL; |
1da177e4 LT |
457 | acpi_gbl_system_notify.handler = NULL; |
458 | acpi_gbl_system_notify.context = NULL; | |
459 | } | |
460 | ||
461 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
4be44fcd | 462 | acpi_gbl_device_notify.node = NULL; |
1da177e4 LT |
463 | acpi_gbl_device_notify.handler = NULL; |
464 | acpi_gbl_device_notify.context = NULL; | |
465 | } | |
466 | } | |
467 | ||
468 | /* All Other Objects */ | |
469 | ||
470 | else { | |
471 | /* Notifies allowed on this object? */ | |
472 | ||
4be44fcd | 473 | if (!acpi_ev_is_notify_object(node)) { |
1da177e4 LT |
474 | status = AE_TYPE; |
475 | goto unlock_and_exit; | |
476 | } | |
477 | ||
478 | /* Check for an existing internal object */ | |
479 | ||
4be44fcd | 480 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 LT |
481 | if (!obj_desc) { |
482 | status = AE_NOT_EXIST; | |
483 | goto unlock_and_exit; | |
484 | } | |
485 | ||
486 | /* Object exists - make sure there's an existing handler */ | |
487 | ||
488 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
489 | notify_obj = obj_desc->common_notify.system_notify; | |
490 | if ((!notify_obj) || | |
4be44fcd | 491 | (notify_obj->notify.handler != handler)) { |
1da177e4 LT |
492 | status = AE_BAD_PARAMETER; |
493 | goto unlock_and_exit; | |
494 | } | |
495 | /* Make sure all deferred tasks are completed */ | |
496 | ||
4be44fcd | 497 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 498 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
499 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
500 | if (ACPI_FAILURE(status)) { | |
501 | return_ACPI_STATUS(status); | |
502 | } | |
1da177e4 LT |
503 | |
504 | /* Remove the handler */ | |
505 | obj_desc->common_notify.system_notify = NULL; | |
4be44fcd | 506 | acpi_ut_remove_reference(notify_obj); |
1da177e4 LT |
507 | } |
508 | ||
509 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
510 | notify_obj = obj_desc->common_notify.device_notify; | |
511 | if ((!notify_obj) || | |
4be44fcd | 512 | (notify_obj->notify.handler != handler)) { |
1da177e4 LT |
513 | status = AE_BAD_PARAMETER; |
514 | goto unlock_and_exit; | |
515 | } | |
516 | /* Make sure all deferred tasks are completed */ | |
517 | ||
4be44fcd | 518 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 519 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
520 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
521 | if (ACPI_FAILURE(status)) { | |
522 | return_ACPI_STATUS(status); | |
523 | } | |
1da177e4 LT |
524 | |
525 | /* Remove the handler */ | |
526 | obj_desc->common_notify.device_notify = NULL; | |
4be44fcd | 527 | acpi_ut_remove_reference(notify_obj); |
1da177e4 LT |
528 | } |
529 | } | |
530 | ||
4be44fcd LB |
531 | unlock_and_exit: |
532 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
533 | return_ACPI_STATUS(status); | |
1da177e4 | 534 | } |
1da177e4 | 535 | |
4be44fcd | 536 | EXPORT_SYMBOL(acpi_remove_notify_handler); |
1da177e4 LT |
537 | |
538 | /******************************************************************************* | |
539 | * | |
540 | * FUNCTION: acpi_install_gpe_handler | |
541 | * | |
44f6c012 RM |
542 | * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
543 | * defined GPEs) | |
544 | * gpe_number - The GPE number within the GPE block | |
1da177e4 LT |
545 | * Type - Whether this GPE should be treated as an |
546 | * edge- or level-triggered interrupt. | |
547 | * Address - Address of the handler | |
548 | * Context - Value passed to the handler on each GPE | |
549 | * | |
550 | * RETURN: Status | |
551 | * | |
552 | * DESCRIPTION: Install a handler for a General Purpose Event. | |
553 | * | |
554 | ******************************************************************************/ | |
555 | ||
556 | acpi_status | |
4be44fcd LB |
557 | acpi_install_gpe_handler(acpi_handle gpe_device, |
558 | u32 gpe_number, | |
559 | u32 type, acpi_event_handler address, void *context) | |
1da177e4 | 560 | { |
4be44fcd LB |
561 | struct acpi_gpe_event_info *gpe_event_info; |
562 | struct acpi_handler_info *handler; | |
563 | acpi_status status; | |
0897831b | 564 | acpi_native_uint flags; |
1da177e4 | 565 | |
4be44fcd | 566 | ACPI_FUNCTION_TRACE("acpi_install_gpe_handler"); |
1da177e4 LT |
567 | |
568 | /* Parameter validation */ | |
569 | ||
570 | if ((!address) || (type > ACPI_GPE_XRUPT_TYPE_MASK)) { | |
4be44fcd | 571 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
572 | } |
573 | ||
4be44fcd LB |
574 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
575 | if (ACPI_FAILURE(status)) { | |
576 | return_ACPI_STATUS(status); | |
1da177e4 LT |
577 | } |
578 | ||
579 | /* Ensure that we have a valid GPE number */ | |
580 | ||
4be44fcd | 581 | gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
1da177e4 LT |
582 | if (!gpe_event_info) { |
583 | status = AE_BAD_PARAMETER; | |
584 | goto unlock_and_exit; | |
585 | } | |
586 | ||
587 | /* Make sure that there isn't a handler there already */ | |
588 | ||
4be44fcd LB |
589 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == |
590 | ACPI_GPE_DISPATCH_HANDLER) { | |
1da177e4 LT |
591 | status = AE_ALREADY_EXISTS; |
592 | goto unlock_and_exit; | |
593 | } | |
594 | ||
595 | /* Allocate and init handler object */ | |
596 | ||
4be44fcd | 597 | handler = ACPI_MEM_CALLOCATE(sizeof(struct acpi_handler_info)); |
1da177e4 LT |
598 | if (!handler) { |
599 | status = AE_NO_MEMORY; | |
600 | goto unlock_and_exit; | |
601 | } | |
602 | ||
4be44fcd LB |
603 | handler->address = address; |
604 | handler->context = context; | |
1da177e4 LT |
605 | handler->method_node = gpe_event_info->dispatch.method_node; |
606 | ||
607 | /* Disable the GPE before installing the handler */ | |
608 | ||
4be44fcd LB |
609 | status = acpi_ev_disable_gpe(gpe_event_info); |
610 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
611 | goto unlock_and_exit; |
612 | } | |
613 | ||
614 | /* Install the handler */ | |
615 | ||
4be44fcd | 616 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
1da177e4 LT |
617 | gpe_event_info->dispatch.handler = handler; |
618 | ||
619 | /* Setup up dispatch flags to indicate handler (vs. method) */ | |
620 | ||
4be44fcd | 621 | gpe_event_info->flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); /* Clear bits */ |
1da177e4 LT |
622 | gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER); |
623 | ||
4be44fcd | 624 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 | 625 | |
4be44fcd LB |
626 | unlock_and_exit: |
627 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
628 | return_ACPI_STATUS(status); | |
1da177e4 | 629 | } |
1da177e4 | 630 | |
4be44fcd | 631 | EXPORT_SYMBOL(acpi_install_gpe_handler); |
1da177e4 LT |
632 | |
633 | /******************************************************************************* | |
634 | * | |
635 | * FUNCTION: acpi_remove_gpe_handler | |
636 | * | |
44f6c012 RM |
637 | * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
638 | * defined GPEs) | |
639 | * gpe_number - The event to remove a handler | |
1da177e4 LT |
640 | * Address - Address of the handler |
641 | * | |
642 | * RETURN: Status | |
643 | * | |
644 | * DESCRIPTION: Remove a handler for a General Purpose acpi_event. | |
645 | * | |
646 | ******************************************************************************/ | |
647 | ||
648 | acpi_status | |
4be44fcd LB |
649 | acpi_remove_gpe_handler(acpi_handle gpe_device, |
650 | u32 gpe_number, acpi_event_handler address) | |
1da177e4 | 651 | { |
4be44fcd LB |
652 | struct acpi_gpe_event_info *gpe_event_info; |
653 | struct acpi_handler_info *handler; | |
654 | acpi_status status; | |
0897831b | 655 | acpi_native_uint flags; |
1da177e4 | 656 | |
4be44fcd | 657 | ACPI_FUNCTION_TRACE("acpi_remove_gpe_handler"); |
1da177e4 LT |
658 | |
659 | /* Parameter validation */ | |
660 | ||
661 | if (!address) { | |
4be44fcd | 662 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
663 | } |
664 | ||
4be44fcd LB |
665 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
666 | if (ACPI_FAILURE(status)) { | |
667 | return_ACPI_STATUS(status); | |
1da177e4 LT |
668 | } |
669 | ||
670 | /* Ensure that we have a valid GPE number */ | |
671 | ||
4be44fcd | 672 | gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
1da177e4 LT |
673 | if (!gpe_event_info) { |
674 | status = AE_BAD_PARAMETER; | |
675 | goto unlock_and_exit; | |
676 | } | |
677 | ||
678 | /* Make sure that a handler is indeed installed */ | |
679 | ||
4be44fcd LB |
680 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) != |
681 | ACPI_GPE_DISPATCH_HANDLER) { | |
1da177e4 LT |
682 | status = AE_NOT_EXIST; |
683 | goto unlock_and_exit; | |
684 | } | |
685 | ||
686 | /* Make sure that the installed handler is the same */ | |
687 | ||
688 | if (gpe_event_info->dispatch.handler->address != address) { | |
689 | status = AE_BAD_PARAMETER; | |
690 | goto unlock_and_exit; | |
691 | } | |
692 | ||
693 | /* Disable the GPE before removing the handler */ | |
694 | ||
4be44fcd LB |
695 | status = acpi_ev_disable_gpe(gpe_event_info); |
696 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
697 | goto unlock_and_exit; |
698 | } | |
699 | ||
700 | /* Make sure all deferred tasks are completed */ | |
701 | ||
4be44fcd | 702 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
1da177e4 | 703 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
704 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
705 | if (ACPI_FAILURE(status)) { | |
706 | return_ACPI_STATUS(status); | |
707 | } | |
1da177e4 LT |
708 | |
709 | /* Remove the handler */ | |
710 | ||
4be44fcd | 711 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
1da177e4 LT |
712 | handler = gpe_event_info->dispatch.handler; |
713 | ||
714 | /* Restore Method node (if any), set dispatch flags */ | |
715 | ||
716 | gpe_event_info->dispatch.method_node = handler->method_node; | |
4be44fcd | 717 | gpe_event_info->flags &= ~ACPI_GPE_DISPATCH_MASK; /* Clear bits */ |
1da177e4 LT |
718 | if (handler->method_node) { |
719 | gpe_event_info->flags |= ACPI_GPE_DISPATCH_METHOD; | |
720 | } | |
4be44fcd | 721 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 LT |
722 | |
723 | /* Now we can free the handler object */ | |
724 | ||
4be44fcd | 725 | ACPI_MEM_FREE(handler); |
1da177e4 | 726 | |
4be44fcd LB |
727 | unlock_and_exit: |
728 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
729 | return_ACPI_STATUS(status); | |
1da177e4 | 730 | } |
1da177e4 | 731 | |
4be44fcd | 732 | EXPORT_SYMBOL(acpi_remove_gpe_handler); |
1da177e4 LT |
733 | |
734 | /******************************************************************************* | |
735 | * | |
736 | * FUNCTION: acpi_acquire_global_lock | |
737 | * | |
738 | * PARAMETERS: Timeout - How long the caller is willing to wait | |
44f6c012 RM |
739 | * Handle - Where the handle to the lock is returned |
740 | * (if acquired) | |
1da177e4 LT |
741 | * |
742 | * RETURN: Status | |
743 | * | |
744 | * DESCRIPTION: Acquire the ACPI Global Lock | |
745 | * | |
746 | ******************************************************************************/ | |
747 | ||
4be44fcd | 748 | acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle) |
1da177e4 | 749 | { |
4be44fcd | 750 | acpi_status status; |
1da177e4 LT |
751 | |
752 | if (!handle) { | |
753 | return (AE_BAD_PARAMETER); | |
754 | } | |
755 | ||
4be44fcd LB |
756 | status = acpi_ex_enter_interpreter(); |
757 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
758 | return (status); |
759 | } | |
760 | ||
4be44fcd LB |
761 | status = acpi_ev_acquire_global_lock(timeout); |
762 | acpi_ex_exit_interpreter(); | |
1da177e4 | 763 | |
4be44fcd | 764 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
765 | acpi_gbl_global_lock_handle++; |
766 | *handle = acpi_gbl_global_lock_handle; | |
767 | } | |
768 | ||
769 | return (status); | |
770 | } | |
1da177e4 | 771 | |
4be44fcd | 772 | EXPORT_SYMBOL(acpi_acquire_global_lock); |
1da177e4 LT |
773 | |
774 | /******************************************************************************* | |
775 | * | |
776 | * FUNCTION: acpi_release_global_lock | |
777 | * | |
778 | * PARAMETERS: Handle - Returned from acpi_acquire_global_lock | |
779 | * | |
780 | * RETURN: Status | |
781 | * | |
44f6c012 | 782 | * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid. |
1da177e4 LT |
783 | * |
784 | ******************************************************************************/ | |
785 | ||
4be44fcd | 786 | acpi_status acpi_release_global_lock(u32 handle) |
1da177e4 | 787 | { |
4be44fcd | 788 | acpi_status status; |
1da177e4 LT |
789 | |
790 | if (handle != acpi_gbl_global_lock_handle) { | |
791 | return (AE_NOT_ACQUIRED); | |
792 | } | |
793 | ||
4be44fcd | 794 | status = acpi_ev_release_global_lock(); |
1da177e4 LT |
795 | return (status); |
796 | } | |
1da177e4 | 797 | |
4be44fcd | 798 | EXPORT_SYMBOL(acpi_release_global_lock); |