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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evxface - External interfaces for ACPI events | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, Intel Corp. |
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 | ||
1da177e4 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/acnamesp.h> | |
46 | #include <acpi/acevents.h> | |
47 | #include <acpi/acinterp.h> | |
48 | ||
49 | #define _COMPONENT ACPI_EVENTS | |
4be44fcd | 50 | ACPI_MODULE_NAME("evxface") |
1da177e4 LT |
51 | |
52 | /******************************************************************************* | |
53 | * | |
54 | * FUNCTION: acpi_install_exception_handler | |
55 | * | |
56 | * PARAMETERS: Handler - Pointer to the handler function for the | |
57 | * event | |
58 | * | |
59 | * RETURN: Status | |
60 | * | |
61 | * DESCRIPTION: Saves the pointer to the handler function | |
62 | * | |
63 | ******************************************************************************/ | |
64 | #ifdef ACPI_FUTURE_USAGE | |
4be44fcd | 65 | acpi_status acpi_install_exception_handler(acpi_exception_handler handler) |
1da177e4 | 66 | { |
4be44fcd | 67 | acpi_status status; |
1da177e4 | 68 | |
b229cf92 | 69 | ACPI_FUNCTION_TRACE(acpi_install_exception_handler); |
1da177e4 | 70 | |
4be44fcd LB |
71 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
72 | if (ACPI_FAILURE(status)) { | |
73 | return_ACPI_STATUS(status); | |
1da177e4 LT |
74 | } |
75 | ||
76 | /* Don't allow two handlers. */ | |
77 | ||
78 | if (acpi_gbl_exception_handler) { | |
79 | status = AE_ALREADY_EXISTS; | |
80 | goto cleanup; | |
81 | } | |
82 | ||
83 | /* Install the handler */ | |
84 | ||
85 | acpi_gbl_exception_handler = handler; | |
86 | ||
4be44fcd LB |
87 | cleanup: |
88 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
89 | return_ACPI_STATUS(status); | |
1da177e4 | 90 | } |
8313524a BM |
91 | |
92 | ACPI_EXPORT_SYMBOL(acpi_install_exception_handler) | |
4be44fcd | 93 | #endif /* ACPI_FUTURE_USAGE */ |
1da177e4 LT |
94 | /******************************************************************************* |
95 | * | |
96 | * FUNCTION: acpi_install_fixed_event_handler | |
97 | * | |
98 | * PARAMETERS: Event - Event type to enable. | |
99 | * Handler - Pointer to the handler function for the | |
100 | * event | |
101 | * Context - Value passed to the handler on each GPE | |
102 | * | |
103 | * RETURN: Status | |
104 | * | |
105 | * DESCRIPTION: Saves the pointer to the handler function and then enables the | |
106 | * event. | |
107 | * | |
108 | ******************************************************************************/ | |
1da177e4 | 109 | acpi_status |
4be44fcd LB |
110 | acpi_install_fixed_event_handler(u32 event, |
111 | acpi_event_handler handler, void *context) | |
1da177e4 | 112 | { |
4be44fcd | 113 | acpi_status status; |
1da177e4 | 114 | |
b229cf92 | 115 | ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler); |
1da177e4 LT |
116 | |
117 | /* Parameter validation */ | |
118 | ||
119 | if (event > ACPI_EVENT_MAX) { | |
4be44fcd | 120 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
121 | } |
122 | ||
4be44fcd LB |
123 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
124 | if (ACPI_FAILURE(status)) { | |
125 | return_ACPI_STATUS(status); | |
1da177e4 LT |
126 | } |
127 | ||
128 | /* Don't allow two handlers. */ | |
129 | ||
130 | if (NULL != acpi_gbl_fixed_event_handlers[event].handler) { | |
131 | status = AE_ALREADY_EXISTS; | |
132 | goto cleanup; | |
133 | } | |
134 | ||
135 | /* Install the handler before enabling the event */ | |
136 | ||
137 | acpi_gbl_fixed_event_handlers[event].handler = handler; | |
138 | acpi_gbl_fixed_event_handlers[event].context = context; | |
139 | ||
4be44fcd | 140 | status = acpi_clear_event(event); |
1da177e4 | 141 | if (ACPI_SUCCESS(status)) |
4be44fcd LB |
142 | status = acpi_enable_event(event, 0); |
143 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
144 | ACPI_WARNING((AE_INFO, "Could not enable fixed event %X", |
145 | event)); | |
1da177e4 LT |
146 | |
147 | /* Remove the handler */ | |
148 | ||
149 | acpi_gbl_fixed_event_handlers[event].handler = NULL; | |
150 | acpi_gbl_fixed_event_handlers[event].context = NULL; | |
4be44fcd LB |
151 | } else { |
152 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
153 | "Enabled fixed event %X, Handler=%p\n", event, | |
154 | handler)); | |
1da177e4 LT |
155 | } |
156 | ||
4be44fcd LB |
157 | cleanup: |
158 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
159 | return_ACPI_STATUS(status); | |
1da177e4 | 160 | } |
1da177e4 | 161 | |
8313524a | 162 | ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler) |
1da177e4 LT |
163 | |
164 | /******************************************************************************* | |
165 | * | |
166 | * FUNCTION: acpi_remove_fixed_event_handler | |
167 | * | |
168 | * PARAMETERS: Event - Event type to disable. | |
169 | * Handler - Address of the handler | |
170 | * | |
171 | * RETURN: Status | |
172 | * | |
173 | * DESCRIPTION: Disables the event and unregisters the event handler. | |
174 | * | |
175 | ******************************************************************************/ | |
1da177e4 | 176 | acpi_status |
4be44fcd | 177 | acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler) |
1da177e4 | 178 | { |
4be44fcd | 179 | acpi_status status = AE_OK; |
1da177e4 | 180 | |
b229cf92 | 181 | ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler); |
1da177e4 LT |
182 | |
183 | /* Parameter validation */ | |
184 | ||
185 | if (event > ACPI_EVENT_MAX) { | |
4be44fcd | 186 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
187 | } |
188 | ||
4be44fcd LB |
189 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
190 | if (ACPI_FAILURE(status)) { | |
191 | return_ACPI_STATUS(status); | |
1da177e4 LT |
192 | } |
193 | ||
194 | /* Disable the event before removing the handler */ | |
195 | ||
4be44fcd | 196 | status = acpi_disable_event(event, 0); |
1da177e4 LT |
197 | |
198 | /* Always Remove the handler */ | |
199 | ||
200 | acpi_gbl_fixed_event_handlers[event].handler = NULL; | |
201 | acpi_gbl_fixed_event_handlers[event].context = NULL; | |
202 | ||
4be44fcd | 203 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
204 | ACPI_WARNING((AE_INFO, |
205 | "Could not write to fixed event enable register %X", | |
206 | event)); | |
4be44fcd | 207 | } else { |
4a90c7e8 | 208 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n", |
4be44fcd | 209 | event)); |
1da177e4 LT |
210 | } |
211 | ||
4be44fcd LB |
212 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
213 | return_ACPI_STATUS(status); | |
1da177e4 | 214 | } |
1da177e4 | 215 | |
8313524a | 216 | ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler) |
1da177e4 LT |
217 | |
218 | /******************************************************************************* | |
219 | * | |
220 | * FUNCTION: acpi_install_notify_handler | |
221 | * | |
222 | * PARAMETERS: Device - The device for which notifies will be handled | |
223 | * handler_type - The type of handler: | |
224 | * ACPI_SYSTEM_NOTIFY: system_handler (00-7f) | |
225 | * ACPI_DEVICE_NOTIFY: driver_handler (80-ff) | |
226 | * ACPI_ALL_NOTIFY: both system and device | |
227 | * Handler - Address of the handler | |
228 | * Context - Value passed to the handler on each GPE | |
229 | * | |
230 | * RETURN: Status | |
231 | * | |
232 | * DESCRIPTION: Install a handler for notifies on an ACPI device | |
233 | * | |
234 | ******************************************************************************/ | |
1da177e4 | 235 | acpi_status |
4be44fcd LB |
236 | acpi_install_notify_handler(acpi_handle device, |
237 | u32 handler_type, | |
238 | acpi_notify_handler handler, void *context) | |
1da177e4 | 239 | { |
4be44fcd LB |
240 | union acpi_operand_object *obj_desc; |
241 | union acpi_operand_object *notify_obj; | |
242 | struct acpi_namespace_node *node; | |
243 | acpi_status status; | |
1da177e4 | 244 | |
b229cf92 | 245 | ACPI_FUNCTION_TRACE(acpi_install_notify_handler); |
1da177e4 LT |
246 | |
247 | /* Parameter validation */ | |
248 | ||
4be44fcd LB |
249 | if ((!device) || |
250 | (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) { | |
251 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
252 | } |
253 | ||
4be44fcd LB |
254 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
255 | if (ACPI_FAILURE(status)) { | |
256 | return_ACPI_STATUS(status); | |
1da177e4 LT |
257 | } |
258 | ||
259 | /* Convert and validate the device handle */ | |
260 | ||
4be44fcd | 261 | node = acpi_ns_map_handle_to_node(device); |
1da177e4 LT |
262 | if (!node) { |
263 | status = AE_BAD_PARAMETER; | |
264 | goto unlock_and_exit; | |
265 | } | |
266 | ||
267 | /* | |
268 | * Root Object: | |
269 | * Registering a notify handler on the root object indicates that the | |
270 | * caller wishes to receive notifications for all objects. Note that | |
271 | * only one <external> global handler can be regsitered (per notify type). | |
272 | */ | |
273 | if (device == ACPI_ROOT_OBJECT) { | |
52fc0b02 | 274 | |
1da177e4 LT |
275 | /* Make sure the handler is not already installed */ |
276 | ||
277 | if (((handler_type & ACPI_SYSTEM_NOTIFY) && | |
4be44fcd LB |
278 | acpi_gbl_system_notify.handler) || |
279 | ((handler_type & ACPI_DEVICE_NOTIFY) && | |
280 | acpi_gbl_device_notify.handler)) { | |
1da177e4 LT |
281 | status = AE_ALREADY_EXISTS; |
282 | goto unlock_and_exit; | |
283 | } | |
284 | ||
285 | if (handler_type & ACPI_SYSTEM_NOTIFY) { | |
4be44fcd | 286 | acpi_gbl_system_notify.node = node; |
1da177e4 LT |
287 | acpi_gbl_system_notify.handler = handler; |
288 | acpi_gbl_system_notify.context = context; | |
289 | } | |
290 | ||
291 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
4be44fcd | 292 | acpi_gbl_device_notify.node = node; |
1da177e4 LT |
293 | acpi_gbl_device_notify.handler = handler; |
294 | acpi_gbl_device_notify.context = context; | |
295 | } | |
296 | ||
297 | /* Global notify handler installed */ | |
298 | } | |
299 | ||
300 | /* | |
301 | * All Other Objects: | |
302 | * Caller will only receive notifications specific to the target object. | |
303 | * Note that only certain object types can receive notifications. | |
304 | */ | |
305 | else { | |
306 | /* Notifies allowed on this object? */ | |
307 | ||
4be44fcd | 308 | if (!acpi_ev_is_notify_object(node)) { |
1da177e4 LT |
309 | status = AE_TYPE; |
310 | goto unlock_and_exit; | |
311 | } | |
312 | ||
313 | /* Check for an existing internal object */ | |
314 | ||
4be44fcd | 315 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 | 316 | if (obj_desc) { |
52fc0b02 | 317 | |
1da177e4 LT |
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) { | |
52fc0b02 | 371 | |
1da177e4 LT |
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 | |
8313524a | 383 | ACPI_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 | ******************************************************************************/ | |
1da177e4 | 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 | |
b229cf92 | 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)) { | |
e8406b44 TR |
416 | status = AE_BAD_PARAMETER; |
417 | goto exit; | |
1da177e4 LT |
418 | } |
419 | ||
4be44fcd LB |
420 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
421 | if (ACPI_FAILURE(status)) { | |
e8406b44 | 422 | goto exit; |
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; | |
f6dd9221 | 430 | goto unlock_and_exit; |
1da177e4 LT |
431 | } |
432 | ||
433 | /* Root Object */ | |
434 | ||
435 | if (device == ACPI_ROOT_OBJECT) { | |
4be44fcd | 436 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4a90c7e8 | 437 | "Removing notify handler for namespace 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 | 443 | status = AE_NOT_EXIST; |
f6dd9221 | 444 | goto unlock_and_exit; |
1da177e4 LT |
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)) { | |
e8406b44 | 453 | goto exit; |
4be44fcd | 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 | 475 | status = AE_TYPE; |
f6dd9221 | 476 | goto unlock_and_exit; |
1da177e4 LT |
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; | |
f6dd9221 | 484 | goto unlock_and_exit; |
1da177e4 LT |
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; | |
f6dd9221 BM |
491 | if (!notify_obj) { |
492 | status = AE_NOT_EXIST; | |
493 | goto unlock_and_exit; | |
494 | } | |
495 | ||
496 | if (notify_obj->notify.handler != handler) { | |
1da177e4 | 497 | status = AE_BAD_PARAMETER; |
f6dd9221 | 498 | goto unlock_and_exit; |
1da177e4 LT |
499 | } |
500 | /* Make sure all deferred tasks are completed */ | |
501 | ||
4be44fcd | 502 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 503 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
504 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
505 | if (ACPI_FAILURE(status)) { | |
e8406b44 | 506 | goto exit; |
4be44fcd | 507 | } |
1da177e4 LT |
508 | |
509 | /* Remove the handler */ | |
510 | obj_desc->common_notify.system_notify = NULL; | |
4be44fcd | 511 | acpi_ut_remove_reference(notify_obj); |
1da177e4 LT |
512 | } |
513 | ||
514 | if (handler_type & ACPI_DEVICE_NOTIFY) { | |
515 | notify_obj = obj_desc->common_notify.device_notify; | |
f6dd9221 BM |
516 | if (!notify_obj) { |
517 | status = AE_NOT_EXIST; | |
518 | goto unlock_and_exit; | |
519 | } | |
520 | ||
521 | if (notify_obj->notify.handler != handler) { | |
1da177e4 | 522 | status = AE_BAD_PARAMETER; |
f6dd9221 | 523 | goto unlock_and_exit; |
1da177e4 LT |
524 | } |
525 | /* Make sure all deferred tasks are completed */ | |
526 | ||
4be44fcd | 527 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
1da177e4 | 528 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
529 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
530 | if (ACPI_FAILURE(status)) { | |
e8406b44 | 531 | goto exit; |
4be44fcd | 532 | } |
1da177e4 LT |
533 | |
534 | /* Remove the handler */ | |
535 | obj_desc->common_notify.device_notify = NULL; | |
4be44fcd | 536 | acpi_ut_remove_reference(notify_obj); |
1da177e4 LT |
537 | } |
538 | } | |
539 | ||
f6dd9221 | 540 | unlock_and_exit: |
4be44fcd | 541 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
f6dd9221 | 542 | exit: |
e8406b44 TR |
543 | if (ACPI_FAILURE(status)) |
544 | ACPI_EXCEPTION((AE_INFO, status, "Removing notify handler")); | |
4be44fcd | 545 | return_ACPI_STATUS(status); |
1da177e4 | 546 | } |
1da177e4 | 547 | |
8313524a | 548 | ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler) |
1da177e4 LT |
549 | |
550 | /******************************************************************************* | |
551 | * | |
552 | * FUNCTION: acpi_install_gpe_handler | |
553 | * | |
44f6c012 RM |
554 | * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
555 | * defined GPEs) | |
556 | * gpe_number - The GPE number within the GPE block | |
1da177e4 LT |
557 | * Type - Whether this GPE should be treated as an |
558 | * edge- or level-triggered interrupt. | |
559 | * Address - Address of the handler | |
560 | * Context - Value passed to the handler on each GPE | |
561 | * | |
562 | * RETURN: Status | |
563 | * | |
564 | * DESCRIPTION: Install a handler for a General Purpose Event. | |
565 | * | |
566 | ******************************************************************************/ | |
1da177e4 | 567 | acpi_status |
4be44fcd LB |
568 | acpi_install_gpe_handler(acpi_handle gpe_device, |
569 | u32 gpe_number, | |
570 | u32 type, acpi_event_handler address, void *context) | |
1da177e4 | 571 | { |
4be44fcd LB |
572 | struct acpi_gpe_event_info *gpe_event_info; |
573 | struct acpi_handler_info *handler; | |
574 | acpi_status status; | |
b8e4d893 | 575 | acpi_cpu_flags flags; |
1da177e4 | 576 | |
b229cf92 | 577 | ACPI_FUNCTION_TRACE(acpi_install_gpe_handler); |
1da177e4 LT |
578 | |
579 | /* Parameter validation */ | |
580 | ||
581 | if ((!address) || (type > ACPI_GPE_XRUPT_TYPE_MASK)) { | |
e8406b44 TR |
582 | status = AE_BAD_PARAMETER; |
583 | goto exit; | |
1da177e4 LT |
584 | } |
585 | ||
4be44fcd LB |
586 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
587 | if (ACPI_FAILURE(status)) { | |
e8406b44 | 588 | goto exit; |
1da177e4 LT |
589 | } |
590 | ||
591 | /* Ensure that we have a valid GPE number */ | |
592 | ||
4be44fcd | 593 | gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
1da177e4 LT |
594 | if (!gpe_event_info) { |
595 | status = AE_BAD_PARAMETER; | |
f6dd9221 | 596 | goto unlock_and_exit; |
1da177e4 LT |
597 | } |
598 | ||
599 | /* Make sure that there isn't a handler there already */ | |
600 | ||
4be44fcd LB |
601 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == |
602 | ACPI_GPE_DISPATCH_HANDLER) { | |
1da177e4 | 603 | status = AE_ALREADY_EXISTS; |
f6dd9221 | 604 | goto unlock_and_exit; |
1da177e4 LT |
605 | } |
606 | ||
607 | /* Allocate and init handler object */ | |
608 | ||
8313524a | 609 | handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_handler_info)); |
1da177e4 LT |
610 | if (!handler) { |
611 | status = AE_NO_MEMORY; | |
f6dd9221 | 612 | goto unlock_and_exit; |
1da177e4 LT |
613 | } |
614 | ||
4be44fcd LB |
615 | handler->address = address; |
616 | handler->context = context; | |
1da177e4 LT |
617 | handler->method_node = gpe_event_info->dispatch.method_node; |
618 | ||
619 | /* Disable the GPE before installing the handler */ | |
620 | ||
4be44fcd LB |
621 | status = acpi_ev_disable_gpe(gpe_event_info); |
622 | if (ACPI_FAILURE(status)) { | |
f6dd9221 | 623 | goto unlock_and_exit; |
1da177e4 LT |
624 | } |
625 | ||
626 | /* Install the handler */ | |
627 | ||
4be44fcd | 628 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
1da177e4 LT |
629 | gpe_event_info->dispatch.handler = handler; |
630 | ||
631 | /* Setup up dispatch flags to indicate handler (vs. method) */ | |
632 | ||
4be44fcd | 633 | gpe_event_info->flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK); /* Clear bits */ |
1da177e4 LT |
634 | gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER); |
635 | ||
4be44fcd | 636 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 | 637 | |
f6dd9221 | 638 | unlock_and_exit: |
4be44fcd | 639 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
f6dd9221 | 640 | exit: |
e8406b44 TR |
641 | if (ACPI_FAILURE(status)) |
642 | ACPI_EXCEPTION((AE_INFO, status, | |
643 | "Installing notify handler failed")); | |
4be44fcd | 644 | return_ACPI_STATUS(status); |
1da177e4 | 645 | } |
1da177e4 | 646 | |
8313524a | 647 | ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler) |
1da177e4 LT |
648 | |
649 | /******************************************************************************* | |
650 | * | |
651 | * FUNCTION: acpi_remove_gpe_handler | |
652 | * | |
44f6c012 RM |
653 | * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT |
654 | * defined GPEs) | |
655 | * gpe_number - The event to remove a handler | |
1da177e4 LT |
656 | * Address - Address of the handler |
657 | * | |
658 | * RETURN: Status | |
659 | * | |
660 | * DESCRIPTION: Remove a handler for a General Purpose acpi_event. | |
661 | * | |
662 | ******************************************************************************/ | |
1da177e4 | 663 | acpi_status |
4be44fcd LB |
664 | acpi_remove_gpe_handler(acpi_handle gpe_device, |
665 | u32 gpe_number, acpi_event_handler address) | |
1da177e4 | 666 | { |
4be44fcd LB |
667 | struct acpi_gpe_event_info *gpe_event_info; |
668 | struct acpi_handler_info *handler; | |
669 | acpi_status status; | |
b8e4d893 | 670 | acpi_cpu_flags flags; |
1da177e4 | 671 | |
b229cf92 | 672 | ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler); |
1da177e4 LT |
673 | |
674 | /* Parameter validation */ | |
675 | ||
676 | if (!address) { | |
4be44fcd | 677 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
678 | } |
679 | ||
4be44fcd LB |
680 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
681 | if (ACPI_FAILURE(status)) { | |
682 | return_ACPI_STATUS(status); | |
1da177e4 LT |
683 | } |
684 | ||
685 | /* Ensure that we have a valid GPE number */ | |
686 | ||
4be44fcd | 687 | gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number); |
1da177e4 LT |
688 | if (!gpe_event_info) { |
689 | status = AE_BAD_PARAMETER; | |
690 | goto unlock_and_exit; | |
691 | } | |
692 | ||
693 | /* Make sure that a handler is indeed installed */ | |
694 | ||
4be44fcd LB |
695 | if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) != |
696 | ACPI_GPE_DISPATCH_HANDLER) { | |
1da177e4 LT |
697 | status = AE_NOT_EXIST; |
698 | goto unlock_and_exit; | |
699 | } | |
700 | ||
701 | /* Make sure that the installed handler is the same */ | |
702 | ||
703 | if (gpe_event_info->dispatch.handler->address != address) { | |
704 | status = AE_BAD_PARAMETER; | |
705 | goto unlock_and_exit; | |
706 | } | |
707 | ||
708 | /* Disable the GPE before removing the handler */ | |
709 | ||
4be44fcd LB |
710 | status = acpi_ev_disable_gpe(gpe_event_info); |
711 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
712 | goto unlock_and_exit; |
713 | } | |
714 | ||
715 | /* Make sure all deferred tasks are completed */ | |
716 | ||
4be44fcd | 717 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
1da177e4 | 718 | acpi_os_wait_events_complete(NULL); |
4be44fcd LB |
719 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
720 | if (ACPI_FAILURE(status)) { | |
721 | return_ACPI_STATUS(status); | |
722 | } | |
1da177e4 LT |
723 | |
724 | /* Remove the handler */ | |
725 | ||
4be44fcd | 726 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
1da177e4 LT |
727 | handler = gpe_event_info->dispatch.handler; |
728 | ||
729 | /* Restore Method node (if any), set dispatch flags */ | |
730 | ||
731 | gpe_event_info->dispatch.method_node = handler->method_node; | |
4be44fcd | 732 | gpe_event_info->flags &= ~ACPI_GPE_DISPATCH_MASK; /* Clear bits */ |
1da177e4 LT |
733 | if (handler->method_node) { |
734 | gpe_event_info->flags |= ACPI_GPE_DISPATCH_METHOD; | |
735 | } | |
4be44fcd | 736 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 LT |
737 | |
738 | /* Now we can free the handler object */ | |
739 | ||
8313524a | 740 | ACPI_FREE(handler); |
1da177e4 | 741 | |
4be44fcd LB |
742 | unlock_and_exit: |
743 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
744 | return_ACPI_STATUS(status); | |
1da177e4 | 745 | } |
1da177e4 | 746 | |
8313524a | 747 | ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler) |
1da177e4 LT |
748 | |
749 | /******************************************************************************* | |
750 | * | |
751 | * FUNCTION: acpi_acquire_global_lock | |
752 | * | |
753 | * PARAMETERS: Timeout - How long the caller is willing to wait | |
44f6c012 RM |
754 | * Handle - Where the handle to the lock is returned |
755 | * (if acquired) | |
1da177e4 LT |
756 | * |
757 | * RETURN: Status | |
758 | * | |
759 | * DESCRIPTION: Acquire the ACPI Global Lock | |
760 | * | |
ba886cd4 BM |
761 | * Note: Allows callers with the same thread ID to acquire the global lock |
762 | * multiple times. In other words, externally, the behavior of the global lock | |
763 | * is identical to an AML mutex. On the first acquire, a new handle is | |
764 | * returned. On any subsequent calls to acquire by the same thread, the same | |
765 | * handle is returned. | |
766 | * | |
1da177e4 | 767 | ******************************************************************************/ |
4be44fcd | 768 | acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle) |
1da177e4 | 769 | { |
4be44fcd | 770 | acpi_status status; |
1da177e4 LT |
771 | |
772 | if (!handle) { | |
773 | return (AE_BAD_PARAMETER); | |
774 | } | |
775 | ||
4d2acd9e | 776 | /* Must lock interpreter to prevent race conditions */ |
1da177e4 | 777 | |
4d2acd9e | 778 | acpi_ex_enter_interpreter(); |
ba886cd4 BM |
779 | |
780 | status = acpi_ex_acquire_mutex_object(timeout, | |
781 | acpi_gbl_global_lock_mutex, | |
782 | acpi_os_get_thread_id()); | |
1da177e4 | 783 | |
4be44fcd | 784 | if (ACPI_SUCCESS(status)) { |
ba886cd4 | 785 | |
e5567afa | 786 | /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */ |
ba886cd4 | 787 | |
1da177e4 LT |
788 | *handle = acpi_gbl_global_lock_handle; |
789 | } | |
790 | ||
ba886cd4 | 791 | acpi_ex_exit_interpreter(); |
1da177e4 LT |
792 | return (status); |
793 | } | |
1da177e4 | 794 | |
8313524a | 795 | ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock) |
1da177e4 LT |
796 | |
797 | /******************************************************************************* | |
798 | * | |
799 | * FUNCTION: acpi_release_global_lock | |
800 | * | |
801 | * PARAMETERS: Handle - Returned from acpi_acquire_global_lock | |
802 | * | |
803 | * RETURN: Status | |
804 | * | |
44f6c012 | 805 | * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid. |
1da177e4 LT |
806 | * |
807 | ******************************************************************************/ | |
4be44fcd | 808 | acpi_status acpi_release_global_lock(u32 handle) |
1da177e4 | 809 | { |
4be44fcd | 810 | acpi_status status; |
1da177e4 | 811 | |
f02e9fa1 | 812 | if (!handle || (handle != acpi_gbl_global_lock_handle)) { |
1da177e4 LT |
813 | return (AE_NOT_ACQUIRED); |
814 | } | |
815 | ||
ba886cd4 | 816 | status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex); |
1da177e4 LT |
817 | return (status); |
818 | } | |
1da177e4 | 819 | |
8313524a | 820 | ACPI_EXPORT_SYMBOL(acpi_release_global_lock) |