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ec2cd81c RW |
1 | /* |
2 | * drivers/acpi/device_pm.c - ACPI device power management routines. | |
3 | * | |
4 | * Copyright (C) 2012, Intel Corp. | |
5 | * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as published | |
11 | * by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
21 | * | |
22 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
23 | */ | |
24 | ||
25 | #include <linux/device.h> | |
86b3832c | 26 | #include <linux/export.h> |
ec2cd81c | 27 | #include <linux/mutex.h> |
86b3832c | 28 | #include <linux/pm_qos.h> |
cd7bd02d | 29 | #include <linux/pm_runtime.h> |
ec2cd81c RW |
30 | |
31 | #include <acpi/acpi.h> | |
32 | #include <acpi/acpi_bus.h> | |
9ce4e607 RW |
33 | #include <acpi/acpi_drivers.h> |
34 | ||
35 | #include "internal.h" | |
36 | ||
37 | #define _COMPONENT ACPI_POWER_COMPONENT | |
38 | ACPI_MODULE_NAME("device_pm"); | |
ec2cd81c | 39 | |
9ce4e607 RW |
40 | /** |
41 | * acpi_power_state_string - String representation of ACPI device power state. | |
42 | * @state: ACPI device power state to return the string representation of. | |
43 | */ | |
44 | const char *acpi_power_state_string(int state) | |
45 | { | |
46 | switch (state) { | |
47 | case ACPI_STATE_D0: | |
48 | return "D0"; | |
49 | case ACPI_STATE_D1: | |
50 | return "D1"; | |
51 | case ACPI_STATE_D2: | |
52 | return "D2"; | |
53 | case ACPI_STATE_D3_HOT: | |
54 | return "D3hot"; | |
55 | case ACPI_STATE_D3_COLD: | |
898fee4f | 56 | return "D3cold"; |
9ce4e607 RW |
57 | default: |
58 | return "(unknown)"; | |
59 | } | |
60 | } | |
61 | ||
62 | /** | |
63 | * acpi_device_get_power - Get power state of an ACPI device. | |
64 | * @device: Device to get the power state of. | |
65 | * @state: Place to store the power state of the device. | |
66 | * | |
67 | * This function does not update the device's power.state field, but it may | |
68 | * update its parent's power.state field (when the parent's power state is | |
69 | * unknown and the device's power state turns out to be D0). | |
70 | */ | |
71 | int acpi_device_get_power(struct acpi_device *device, int *state) | |
72 | { | |
73 | int result = ACPI_STATE_UNKNOWN; | |
74 | ||
75 | if (!device || !state) | |
76 | return -EINVAL; | |
77 | ||
78 | if (!device->flags.power_manageable) { | |
79 | /* TBD: Non-recursive algorithm for walking up hierarchy. */ | |
80 | *state = device->parent ? | |
81 | device->parent->power.state : ACPI_STATE_D0; | |
82 | goto out; | |
83 | } | |
84 | ||
85 | /* | |
75eb2d13 RW |
86 | * Get the device's power state from power resources settings and _PSC, |
87 | * if available. | |
9ce4e607 | 88 | */ |
75eb2d13 RW |
89 | if (device->power.flags.power_resources) { |
90 | int error = acpi_power_get_inferred_state(device, &result); | |
91 | if (error) | |
92 | return error; | |
93 | } | |
9ce4e607 | 94 | if (device->power.flags.explicit_get) { |
75eb2d13 | 95 | acpi_handle handle = device->handle; |
9ce4e607 | 96 | unsigned long long psc; |
75eb2d13 RW |
97 | acpi_status status; |
98 | ||
99 | status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc); | |
9ce4e607 RW |
100 | if (ACPI_FAILURE(status)) |
101 | return -ENODEV; | |
102 | ||
75eb2d13 RW |
103 | /* |
104 | * The power resources settings may indicate a power state | |
105 | * shallower than the actual power state of the device. | |
106 | * | |
107 | * Moreover, on systems predating ACPI 4.0, if the device | |
108 | * doesn't depend on any power resources and _PSC returns 3, | |
109 | * that means "power off". We need to maintain compatibility | |
110 | * with those systems. | |
111 | */ | |
112 | if (psc > result && psc < ACPI_STATE_D3_COLD) | |
113 | result = psc; | |
114 | else if (result == ACPI_STATE_UNKNOWN) | |
115 | result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_COLD : psc; | |
9ce4e607 RW |
116 | } |
117 | ||
118 | /* | |
119 | * If we were unsure about the device parent's power state up to this | |
120 | * point, the fact that the device is in D0 implies that the parent has | |
121 | * to be in D0 too. | |
122 | */ | |
123 | if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN | |
124 | && result == ACPI_STATE_D0) | |
125 | device->parent->power.state = ACPI_STATE_D0; | |
126 | ||
127 | *state = result; | |
128 | ||
129 | out: | |
130 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", | |
131 | device->pnp.bus_id, acpi_power_state_string(*state))); | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
9c0f45e3 RW |
136 | static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
137 | { | |
138 | if (adev->power.states[state].flags.explicit_set) { | |
139 | char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; | |
140 | acpi_status status; | |
141 | ||
142 | status = acpi_evaluate_object(adev->handle, method, NULL, NULL); | |
143 | if (ACPI_FAILURE(status)) | |
144 | return -ENODEV; | |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
9ce4e607 RW |
149 | /** |
150 | * acpi_device_set_power - Set power state of an ACPI device. | |
151 | * @device: Device to set the power state of. | |
152 | * @state: New power state to set. | |
153 | * | |
154 | * Callers must ensure that the device is power manageable before using this | |
155 | * function. | |
156 | */ | |
157 | int acpi_device_set_power(struct acpi_device *device, int state) | |
158 | { | |
159 | int result = 0; | |
9ce4e607 RW |
160 | bool cut_power = false; |
161 | ||
162 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) | |
163 | return -EINVAL; | |
164 | ||
165 | /* Make sure this is a valid target state */ | |
166 | ||
167 | if (state == device->power.state) { | |
168 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n", | |
169 | acpi_power_state_string(state))); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | if (!device->power.states[state].flags.valid) { | |
174 | printk(KERN_WARNING PREFIX "Device does not support %s\n", | |
175 | acpi_power_state_string(state)); | |
176 | return -ENODEV; | |
177 | } | |
178 | if (device->parent && (state < device->parent->power.state)) { | |
179 | printk(KERN_WARNING PREFIX | |
180 | "Cannot set device to a higher-powered" | |
181 | " state than parent\n"); | |
182 | return -ENODEV; | |
183 | } | |
184 | ||
185 | /* For D3cold we should first transition into D3hot. */ | |
186 | if (state == ACPI_STATE_D3_COLD | |
187 | && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) { | |
188 | state = ACPI_STATE_D3_HOT; | |
9ce4e607 RW |
189 | cut_power = true; |
190 | } | |
191 | ||
e78adb75 RW |
192 | if (state < device->power.state && state != ACPI_STATE_D0 |
193 | && device->power.state >= ACPI_STATE_D3_HOT) { | |
194 | printk(KERN_WARNING PREFIX | |
195 | "Cannot transition to non-D0 state from D3\n"); | |
196 | return -ENODEV; | |
197 | } | |
198 | ||
9ce4e607 RW |
199 | /* |
200 | * Transition Power | |
201 | * ---------------- | |
e78adb75 RW |
202 | * In accordance with the ACPI specification first apply power (via |
203 | * power resources) and then evalute _PSx. | |
9ce4e607 | 204 | */ |
e78adb75 RW |
205 | if (device->power.flags.power_resources) { |
206 | result = acpi_power_transition(device, state); | |
9c0f45e3 RW |
207 | if (result) |
208 | goto end; | |
9ce4e607 | 209 | } |
e78adb75 RW |
210 | result = acpi_dev_pm_explicit_set(device, state); |
211 | if (result) | |
212 | goto end; | |
9ce4e607 | 213 | |
e5656271 RW |
214 | if (cut_power) { |
215 | device->power.state = state; | |
216 | state = ACPI_STATE_D3_COLD; | |
217 | result = acpi_power_transition(device, state); | |
218 | } | |
9ce4e607 | 219 | |
e78adb75 RW |
220 | end: |
221 | if (result) { | |
9ce4e607 RW |
222 | printk(KERN_WARNING PREFIX |
223 | "Device [%s] failed to transition to %s\n", | |
224 | device->pnp.bus_id, | |
225 | acpi_power_state_string(state)); | |
e78adb75 | 226 | } else { |
9ce4e607 RW |
227 | device->power.state = state; |
228 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
229 | "Device [%s] transitioned to %s\n", | |
230 | device->pnp.bus_id, | |
231 | acpi_power_state_string(state))); | |
232 | } | |
233 | ||
234 | return result; | |
235 | } | |
236 | EXPORT_SYMBOL(acpi_device_set_power); | |
237 | ||
238 | int acpi_bus_set_power(acpi_handle handle, int state) | |
239 | { | |
240 | struct acpi_device *device; | |
241 | int result; | |
242 | ||
243 | result = acpi_bus_get_device(handle, &device); | |
244 | if (result) | |
245 | return result; | |
246 | ||
247 | if (!device->flags.power_manageable) { | |
248 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
249 | "Device [%s] is not power manageable\n", | |
250 | dev_name(&device->dev))); | |
251 | return -ENODEV; | |
252 | } | |
253 | ||
254 | return acpi_device_set_power(device, state); | |
255 | } | |
256 | EXPORT_SYMBOL(acpi_bus_set_power); | |
257 | ||
258 | int acpi_bus_init_power(struct acpi_device *device) | |
259 | { | |
260 | int state; | |
261 | int result; | |
262 | ||
263 | if (!device) | |
264 | return -EINVAL; | |
265 | ||
266 | device->power.state = ACPI_STATE_UNKNOWN; | |
267 | ||
268 | result = acpi_device_get_power(device, &state); | |
269 | if (result) | |
270 | return result; | |
271 | ||
a2367807 | 272 | if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { |
9ce4e607 | 273 | result = acpi_power_on_resources(device, state); |
a2367807 RW |
274 | if (result) |
275 | return result; | |
9ce4e607 | 276 | |
9c0f45e3 RW |
277 | result = acpi_dev_pm_explicit_set(device, state); |
278 | if (result) | |
279 | return result; | |
b3785492 | 280 | } else if (state == ACPI_STATE_UNKNOWN) { |
7cd8407d RW |
281 | /* |
282 | * No power resources and missing _PSC? Cross fingers and make | |
283 | * it D0 in hope that this is what the BIOS put the device into. | |
284 | * [We tried to force D0 here by executing _PS0, but that broke | |
285 | * Toshiba P870-303 in a nasty way.] | |
286 | */ | |
b3785492 | 287 | state = ACPI_STATE_D0; |
a2367807 RW |
288 | } |
289 | device->power.state = state; | |
290 | return 0; | |
9ce4e607 RW |
291 | } |
292 | ||
b9e95fc6 RW |
293 | /** |
294 | * acpi_device_fix_up_power - Force device with missing _PSC into D0. | |
295 | * @device: Device object whose power state is to be fixed up. | |
296 | * | |
297 | * Devices without power resources and _PSC, but having _PS0 and _PS3 defined, | |
298 | * are assumed to be put into D0 by the BIOS. However, in some cases that may | |
299 | * not be the case and this function should be used then. | |
300 | */ | |
301 | int acpi_device_fix_up_power(struct acpi_device *device) | |
302 | { | |
303 | int ret = 0; | |
304 | ||
305 | if (!device->power.flags.power_resources | |
306 | && !device->power.flags.explicit_get | |
307 | && device->power.state == ACPI_STATE_D0) | |
308 | ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
9ce4e607 RW |
313 | int acpi_bus_update_power(acpi_handle handle, int *state_p) |
314 | { | |
315 | struct acpi_device *device; | |
316 | int state; | |
317 | int result; | |
318 | ||
319 | result = acpi_bus_get_device(handle, &device); | |
320 | if (result) | |
321 | return result; | |
322 | ||
323 | result = acpi_device_get_power(device, &state); | |
324 | if (result) | |
325 | return result; | |
326 | ||
91bdad0b | 327 | if (state == ACPI_STATE_UNKNOWN) { |
511d5c42 | 328 | state = ACPI_STATE_D0; |
91bdad0b RW |
329 | result = acpi_device_set_power(device, state); |
330 | if (result) | |
331 | return result; | |
332 | } else { | |
333 | if (device->power.flags.power_resources) { | |
334 | /* | |
335 | * We don't need to really switch the state, bu we need | |
336 | * to update the power resources' reference counters. | |
337 | */ | |
338 | result = acpi_power_transition(device, state); | |
339 | if (result) | |
340 | return result; | |
341 | } | |
342 | device->power.state = state; | |
343 | } | |
344 | if (state_p) | |
9ce4e607 RW |
345 | *state_p = state; |
346 | ||
91bdad0b | 347 | return 0; |
9ce4e607 RW |
348 | } |
349 | EXPORT_SYMBOL_GPL(acpi_bus_update_power); | |
350 | ||
351 | bool acpi_bus_power_manageable(acpi_handle handle) | |
352 | { | |
353 | struct acpi_device *device; | |
354 | int result; | |
355 | ||
356 | result = acpi_bus_get_device(handle, &device); | |
357 | return result ? false : device->flags.power_manageable; | |
358 | } | |
359 | EXPORT_SYMBOL(acpi_bus_power_manageable); | |
360 | ||
ec4602a9 RW |
361 | #ifdef CONFIG_PM |
362 | static DEFINE_MUTEX(acpi_pm_notifier_lock); | |
363 | ||
364 | /** | |
365 | * acpi_add_pm_notifier - Register PM notifier for given ACPI device. | |
366 | * @adev: ACPI device to add the notifier for. | |
367 | * @context: Context information to pass to the notifier routine. | |
368 | * | |
369 | * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of | |
370 | * PM wakeup events. For example, wakeup events may be generated for bridges | |
371 | * if one of the devices below the bridge is signaling wakeup, even if the | |
372 | * bridge itself doesn't have a wakeup GPE associated with it. | |
373 | */ | |
374 | acpi_status acpi_add_pm_notifier(struct acpi_device *adev, | |
375 | acpi_notify_handler handler, void *context) | |
376 | { | |
377 | acpi_status status = AE_ALREADY_EXISTS; | |
378 | ||
379 | mutex_lock(&acpi_pm_notifier_lock); | |
380 | ||
381 | if (adev->wakeup.flags.notifier_present) | |
382 | goto out; | |
383 | ||
384 | status = acpi_install_notify_handler(adev->handle, | |
385 | ACPI_SYSTEM_NOTIFY, | |
386 | handler, context); | |
387 | if (ACPI_FAILURE(status)) | |
388 | goto out; | |
389 | ||
390 | adev->wakeup.flags.notifier_present = true; | |
391 | ||
392 | out: | |
393 | mutex_unlock(&acpi_pm_notifier_lock); | |
394 | return status; | |
395 | } | |
396 | ||
397 | /** | |
398 | * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
399 | * @adev: ACPI device to remove the notifier from. | |
400 | */ | |
401 | acpi_status acpi_remove_pm_notifier(struct acpi_device *adev, | |
402 | acpi_notify_handler handler) | |
403 | { | |
404 | acpi_status status = AE_BAD_PARAMETER; | |
405 | ||
406 | mutex_lock(&acpi_pm_notifier_lock); | |
407 | ||
408 | if (!adev->wakeup.flags.notifier_present) | |
409 | goto out; | |
410 | ||
411 | status = acpi_remove_notify_handler(adev->handle, | |
412 | ACPI_SYSTEM_NOTIFY, | |
413 | handler); | |
414 | if (ACPI_FAILURE(status)) | |
415 | goto out; | |
416 | ||
417 | adev->wakeup.flags.notifier_present = false; | |
418 | ||
419 | out: | |
420 | mutex_unlock(&acpi_pm_notifier_lock); | |
421 | return status; | |
422 | } | |
423 | ||
9ce4e607 RW |
424 | bool acpi_bus_can_wakeup(acpi_handle handle) |
425 | { | |
426 | struct acpi_device *device; | |
427 | int result; | |
428 | ||
429 | result = acpi_bus_get_device(handle, &device); | |
430 | return result ? false : device->wakeup.flags.valid; | |
431 | } | |
432 | EXPORT_SYMBOL(acpi_bus_can_wakeup); | |
433 | ||
86b3832c | 434 | /** |
b25c77ef | 435 | * acpi_dev_pm_get_state - Get preferred power state of ACPI device. |
86b3832c RW |
436 | * @dev: Device whose preferred target power state to return. |
437 | * @adev: ACPI device node corresponding to @dev. | |
438 | * @target_state: System state to match the resultant device state. | |
fa1675b5 RW |
439 | * @d_min_p: Location to store the highest power state available to the device. |
440 | * @d_max_p: Location to store the lowest power state available to the device. | |
86b3832c | 441 | * |
fa1675b5 RW |
442 | * Find the lowest power (highest number) and highest power (lowest number) ACPI |
443 | * device power states that the device can be in while the system is in the | |
444 | * state represented by @target_state. Store the integer numbers representing | |
445 | * those stats in the memory locations pointed to by @d_max_p and @d_min_p, | |
446 | * respectively. | |
86b3832c RW |
447 | * |
448 | * Callers must ensure that @dev and @adev are valid pointers and that @adev | |
449 | * actually corresponds to @dev before using this function. | |
fa1675b5 RW |
450 | * |
451 | * Returns 0 on success or -ENODATA when one of the ACPI methods fails or | |
452 | * returns a value that doesn't make sense. The memory locations pointed to by | |
453 | * @d_max_p and @d_min_p are only modified on success. | |
86b3832c | 454 | */ |
b25c77ef | 455 | static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, |
fa1675b5 | 456 | u32 target_state, int *d_min_p, int *d_max_p) |
86b3832c | 457 | { |
fa1675b5 RW |
458 | char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; |
459 | acpi_handle handle = adev->handle; | |
460 | unsigned long long ret; | |
461 | int d_min, d_max; | |
86b3832c | 462 | bool wakeup = false; |
fa1675b5 | 463 | acpi_status status; |
86b3832c | 464 | |
86b3832c | 465 | /* |
fa1675b5 RW |
466 | * If the system state is S0, the lowest power state the device can be |
467 | * in is D3cold, unless the device has _S0W and is supposed to signal | |
468 | * wakeup, in which case the return value of _S0W has to be used as the | |
469 | * lowest power state available to the device. | |
86b3832c RW |
470 | */ |
471 | d_min = ACPI_STATE_D0; | |
4c164ae7 | 472 | d_max = ACPI_STATE_D3_COLD; |
86b3832c RW |
473 | |
474 | /* | |
475 | * If present, _SxD methods return the minimum D-state (highest power | |
476 | * state) we can use for the corresponding S-states. Otherwise, the | |
477 | * minimum D-state is D0 (ACPI 3.x). | |
86b3832c RW |
478 | */ |
479 | if (target_state > ACPI_STATE_S0) { | |
fa1675b5 RW |
480 | /* |
481 | * We rely on acpi_evaluate_integer() not clobbering the integer | |
482 | * provided if AE_NOT_FOUND is returned. | |
483 | */ | |
484 | ret = d_min; | |
485 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
486 | if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) | |
487 | || ret > ACPI_STATE_D3_COLD) | |
488 | return -ENODATA; | |
489 | ||
490 | /* | |
491 | * We need to handle legacy systems where D3hot and D3cold are | |
492 | * the same and 3 is returned in both cases, so fall back to | |
493 | * D3cold if D3hot is not a valid state. | |
494 | */ | |
495 | if (!adev->power.states[ret].flags.valid) { | |
496 | if (ret == ACPI_STATE_D3_HOT) | |
497 | ret = ACPI_STATE_D3_COLD; | |
498 | else | |
499 | return -ENODATA; | |
500 | } | |
501 | d_min = ret; | |
86b3832c RW |
502 | wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid |
503 | && adev->wakeup.sleep_state >= target_state; | |
504 | } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != | |
505 | PM_QOS_FLAGS_NONE) { | |
506 | wakeup = adev->wakeup.flags.valid; | |
507 | } | |
508 | ||
509 | /* | |
510 | * If _PRW says we can wake up the system from the target sleep state, | |
511 | * the D-state returned by _SxD is sufficient for that (we assume a | |
512 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
513 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
514 | * can wake the system. _S0W may be valid, too. | |
515 | */ | |
516 | if (wakeup) { | |
fa1675b5 RW |
517 | method[3] = 'W'; |
518 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
519 | if (status == AE_NOT_FOUND) { | |
520 | if (target_state > ACPI_STATE_S0) | |
86b3832c | 521 | d_max = d_min; |
fa1675b5 RW |
522 | } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { |
523 | /* Fall back to D3cold if ret is not a valid state. */ | |
524 | if (!adev->power.states[ret].flags.valid) | |
525 | ret = ACPI_STATE_D3_COLD; | |
526 | ||
527 | d_max = ret > d_min ? ret : d_min; | |
528 | } else { | |
529 | return -ENODATA; | |
86b3832c RW |
530 | } |
531 | } | |
532 | ||
86b3832c RW |
533 | if (d_min_p) |
534 | *d_min_p = d_min; | |
fa1675b5 RW |
535 | |
536 | if (d_max_p) | |
537 | *d_max_p = d_max; | |
538 | ||
539 | return 0; | |
86b3832c | 540 | } |
cd7bd02d | 541 | |
a6ae7594 RW |
542 | /** |
543 | * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. | |
544 | * @dev: Device whose preferred target power state to return. | |
545 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
546 | * @d_max_in: Deepest low-power state to take into consideration. | |
547 | * Return value: Preferred power state of the device on success, -ENODEV | |
fa1675b5 RW |
548 | * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is |
549 | * incorrect, or -ENODATA on ACPI method failure. | |
a6ae7594 RW |
550 | * |
551 | * The caller must ensure that @dev is valid before using this function. | |
552 | */ | |
553 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) | |
554 | { | |
555 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
556 | struct acpi_device *adev; | |
9b5c7a5a | 557 | int ret, d_min, d_max; |
fa1675b5 RW |
558 | |
559 | if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) | |
560 | return -EINVAL; | |
561 | ||
562 | if (d_max_in > ACPI_STATE_D3_HOT) { | |
563 | enum pm_qos_flags_status stat; | |
564 | ||
565 | stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); | |
566 | if (stat == PM_QOS_FLAGS_ALL) | |
567 | d_max_in = ACPI_STATE_D3_HOT; | |
568 | } | |
a6ae7594 | 569 | |
dde3bb41 | 570 | if (!handle || acpi_bus_get_device(handle, &adev)) { |
a6ae7594 RW |
571 | dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); |
572 | return -ENODEV; | |
573 | } | |
574 | ||
fa1675b5 | 575 | ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), |
9b5c7a5a | 576 | &d_min, &d_max); |
fa1675b5 RW |
577 | if (ret) |
578 | return ret; | |
579 | ||
9b5c7a5a | 580 | if (d_max_in < d_min) |
fa1675b5 RW |
581 | return -EINVAL; |
582 | ||
583 | if (d_max > d_max_in) { | |
9b5c7a5a | 584 | for (d_max = d_max_in; d_max > d_min; d_max--) { |
fa1675b5 RW |
585 | if (adev->power.states[d_max].flags.valid) |
586 | break; | |
587 | } | |
588 | } | |
9b5c7a5a RW |
589 | |
590 | if (d_min_p) | |
591 | *d_min_p = d_min; | |
592 | ||
fa1675b5 | 593 | return d_max; |
a6ae7594 RW |
594 | } |
595 | EXPORT_SYMBOL(acpi_pm_device_sleep_state); | |
596 | ||
cd7bd02d | 597 | #ifdef CONFIG_PM_RUNTIME |
e5cc8ef3 RW |
598 | /** |
599 | * acpi_wakeup_device - Wakeup notification handler for ACPI devices. | |
600 | * @handle: ACPI handle of the device the notification is for. | |
601 | * @event: Type of the signaled event. | |
602 | * @context: Device corresponding to @handle. | |
603 | */ | |
604 | static void acpi_wakeup_device(acpi_handle handle, u32 event, void *context) | |
605 | { | |
606 | struct device *dev = context; | |
607 | ||
608 | if (event == ACPI_NOTIFY_DEVICE_WAKE && dev) { | |
609 | pm_wakeup_event(dev, 0); | |
610 | pm_runtime_resume(dev); | |
611 | } | |
612 | } | |
613 | ||
cd7bd02d | 614 | /** |
dee8370c RW |
615 | * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device. |
616 | * @adev: ACPI device to enable/disable the remote wakeup for. | |
cd7bd02d RW |
617 | * @enable: Whether to enable or disable the wakeup functionality. |
618 | * | |
dee8370c RW |
619 | * Enable/disable the GPE associated with @adev so that it can generate |
620 | * wakeup signals for the device in response to external (remote) events and | |
621 | * enable/disable device wakeup power. | |
622 | * | |
623 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
624 | * this function. | |
625 | */ | |
626 | int __acpi_device_run_wake(struct acpi_device *adev, bool enable) | |
627 | { | |
628 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
629 | ||
630 | if (enable) { | |
631 | acpi_status res; | |
632 | int error; | |
633 | ||
634 | error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0); | |
635 | if (error) | |
636 | return error; | |
637 | ||
638 | res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
639 | if (ACPI_FAILURE(res)) { | |
640 | acpi_disable_wakeup_device_power(adev); | |
641 | return -EIO; | |
642 | } | |
643 | } else { | |
644 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
645 | acpi_disable_wakeup_device_power(adev); | |
646 | } | |
647 | return 0; | |
648 | } | |
649 | ||
650 | /** | |
651 | * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. | |
652 | * @dev: Device to enable/disable the platform to wake up. | |
653 | * @enable: Whether to enable or disable the wakeup functionality. | |
cd7bd02d RW |
654 | */ |
655 | int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) | |
656 | { | |
dee8370c | 657 | struct acpi_device *adev; |
cd7bd02d RW |
658 | acpi_handle handle; |
659 | ||
660 | if (!device_run_wake(phys_dev)) | |
661 | return -EINVAL; | |
662 | ||
663 | handle = DEVICE_ACPI_HANDLE(phys_dev); | |
dde3bb41 | 664 | if (!handle || acpi_bus_get_device(handle, &adev)) { |
dee8370c | 665 | dev_dbg(phys_dev, "ACPI handle without context in %s!\n", |
cd7bd02d RW |
666 | __func__); |
667 | return -ENODEV; | |
668 | } | |
669 | ||
dee8370c | 670 | return __acpi_device_run_wake(adev, enable); |
cd7bd02d RW |
671 | } |
672 | EXPORT_SYMBOL(acpi_pm_device_run_wake); | |
e5cc8ef3 RW |
673 | #else |
674 | static inline void acpi_wakeup_device(acpi_handle handle, u32 event, | |
675 | void *context) {} | |
cd7bd02d | 676 | #endif /* CONFIG_PM_RUNTIME */ |
dee8370c | 677 | |
4d56410b | 678 | #ifdef CONFIG_PM_SLEEP |
dee8370c RW |
679 | /** |
680 | * __acpi_device_sleep_wake - Enable or disable device to wake up the system. | |
681 | * @dev: Device to enable/desible to wake up the system. | |
682 | * @target_state: System state the device is supposed to wake up from. | |
683 | * @enable: Whether to enable or disable @dev to wake up the system. | |
684 | */ | |
685 | int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state, | |
686 | bool enable) | |
687 | { | |
688 | return enable ? | |
689 | acpi_enable_wakeup_device_power(adev, target_state) : | |
690 | acpi_disable_wakeup_device_power(adev); | |
691 | } | |
a6ae7594 RW |
692 | |
693 | /** | |
694 | * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system. | |
695 | * @dev: Device to enable/desible to wake up the system from sleep states. | |
696 | * @enable: Whether to enable or disable @dev to wake up the system. | |
697 | */ | |
698 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
699 | { | |
700 | acpi_handle handle; | |
701 | struct acpi_device *adev; | |
702 | int error; | |
703 | ||
704 | if (!device_can_wakeup(dev)) | |
705 | return -EINVAL; | |
706 | ||
707 | handle = DEVICE_ACPI_HANDLE(dev); | |
dde3bb41 | 708 | if (!handle || acpi_bus_get_device(handle, &adev)) { |
a6ae7594 RW |
709 | dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); |
710 | return -ENODEV; | |
711 | } | |
712 | ||
713 | error = __acpi_device_sleep_wake(adev, acpi_target_system_state(), | |
714 | enable); | |
715 | if (!error) | |
716 | dev_info(dev, "System wakeup %s by ACPI\n", | |
717 | enable ? "enabled" : "disabled"); | |
718 | ||
719 | return error; | |
720 | } | |
dee8370c | 721 | #endif /* CONFIG_PM_SLEEP */ |
e5cc8ef3 RW |
722 | |
723 | /** | |
724 | * acpi_dev_pm_get_node - Get ACPI device node for the given physical device. | |
725 | * @dev: Device to get the ACPI node for. | |
726 | */ | |
d2e5f0c1 | 727 | struct acpi_device *acpi_dev_pm_get_node(struct device *dev) |
e5cc8ef3 RW |
728 | { |
729 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
730 | struct acpi_device *adev; | |
731 | ||
5cc36c72 | 732 | return handle && !acpi_bus_get_device(handle, &adev) ? adev : NULL; |
e5cc8ef3 RW |
733 | } |
734 | ||
735 | /** | |
736 | * acpi_dev_pm_low_power - Put ACPI device into a low-power state. | |
737 | * @dev: Device to put into a low-power state. | |
738 | * @adev: ACPI device node corresponding to @dev. | |
739 | * @system_state: System state to choose the device state for. | |
740 | */ | |
741 | static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, | |
742 | u32 system_state) | |
743 | { | |
fa1675b5 | 744 | int ret, state; |
e5cc8ef3 RW |
745 | |
746 | if (!acpi_device_power_manageable(adev)) | |
747 | return 0; | |
748 | ||
fa1675b5 RW |
749 | ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); |
750 | return ret ? ret : acpi_device_set_power(adev, state); | |
e5cc8ef3 RW |
751 | } |
752 | ||
753 | /** | |
754 | * acpi_dev_pm_full_power - Put ACPI device into the full-power state. | |
755 | * @adev: ACPI device node to put into the full-power state. | |
756 | */ | |
757 | static int acpi_dev_pm_full_power(struct acpi_device *adev) | |
758 | { | |
759 | return acpi_device_power_manageable(adev) ? | |
760 | acpi_device_set_power(adev, ACPI_STATE_D0) : 0; | |
761 | } | |
762 | ||
763 | #ifdef CONFIG_PM_RUNTIME | |
764 | /** | |
765 | * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. | |
766 | * @dev: Device to put into a low-power state. | |
767 | * | |
768 | * Put the given device into a runtime low-power state using the standard ACPI | |
769 | * mechanism. Set up remote wakeup if desired, choose the state to put the | |
770 | * device into (this checks if remote wakeup is expected to work too), and set | |
771 | * the power state of the device. | |
772 | */ | |
773 | int acpi_dev_runtime_suspend(struct device *dev) | |
774 | { | |
775 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
776 | bool remote_wakeup; | |
777 | int error; | |
778 | ||
779 | if (!adev) | |
780 | return 0; | |
781 | ||
782 | remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > | |
783 | PM_QOS_FLAGS_NONE; | |
784 | error = __acpi_device_run_wake(adev, remote_wakeup); | |
785 | if (remote_wakeup && error) | |
786 | return -EAGAIN; | |
787 | ||
788 | error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
789 | if (error) | |
790 | __acpi_device_run_wake(adev, false); | |
791 | ||
792 | return error; | |
793 | } | |
794 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); | |
795 | ||
796 | /** | |
797 | * acpi_dev_runtime_resume - Put device into the full-power state using ACPI. | |
798 | * @dev: Device to put into the full-power state. | |
799 | * | |
800 | * Put the given device into the full-power state using the standard ACPI | |
801 | * mechanism at run time. Set the power state of the device to ACPI D0 and | |
802 | * disable remote wakeup. | |
803 | */ | |
804 | int acpi_dev_runtime_resume(struct device *dev) | |
805 | { | |
806 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
807 | int error; | |
808 | ||
809 | if (!adev) | |
810 | return 0; | |
811 | ||
812 | error = acpi_dev_pm_full_power(adev); | |
813 | __acpi_device_run_wake(adev, false); | |
814 | return error; | |
815 | } | |
816 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); | |
817 | ||
818 | /** | |
819 | * acpi_subsys_runtime_suspend - Suspend device using ACPI. | |
820 | * @dev: Device to suspend. | |
821 | * | |
822 | * Carry out the generic runtime suspend procedure for @dev and use ACPI to put | |
823 | * it into a runtime low-power state. | |
824 | */ | |
825 | int acpi_subsys_runtime_suspend(struct device *dev) | |
826 | { | |
827 | int ret = pm_generic_runtime_suspend(dev); | |
828 | return ret ? ret : acpi_dev_runtime_suspend(dev); | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); | |
831 | ||
832 | /** | |
833 | * acpi_subsys_runtime_resume - Resume device using ACPI. | |
834 | * @dev: Device to Resume. | |
835 | * | |
836 | * Use ACPI to put the given device into the full-power state and carry out the | |
837 | * generic runtime resume procedure for it. | |
838 | */ | |
839 | int acpi_subsys_runtime_resume(struct device *dev) | |
840 | { | |
841 | int ret = acpi_dev_runtime_resume(dev); | |
842 | return ret ? ret : pm_generic_runtime_resume(dev); | |
843 | } | |
844 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); | |
845 | #endif /* CONFIG_PM_RUNTIME */ | |
846 | ||
847 | #ifdef CONFIG_PM_SLEEP | |
848 | /** | |
849 | * acpi_dev_suspend_late - Put device into a low-power state using ACPI. | |
850 | * @dev: Device to put into a low-power state. | |
851 | * | |
852 | * Put the given device into a low-power state during system transition to a | |
853 | * sleep state using the standard ACPI mechanism. Set up system wakeup if | |
854 | * desired, choose the state to put the device into (this checks if system | |
855 | * wakeup is expected to work too), and set the power state of the device. | |
856 | */ | |
857 | int acpi_dev_suspend_late(struct device *dev) | |
858 | { | |
859 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
860 | u32 target_state; | |
861 | bool wakeup; | |
862 | int error; | |
863 | ||
864 | if (!adev) | |
865 | return 0; | |
866 | ||
867 | target_state = acpi_target_system_state(); | |
868 | wakeup = device_may_wakeup(dev); | |
869 | error = __acpi_device_sleep_wake(adev, target_state, wakeup); | |
870 | if (wakeup && error) | |
871 | return error; | |
872 | ||
873 | error = acpi_dev_pm_low_power(dev, adev, target_state); | |
874 | if (error) | |
875 | __acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false); | |
876 | ||
877 | return error; | |
878 | } | |
879 | EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); | |
880 | ||
881 | /** | |
882 | * acpi_dev_resume_early - Put device into the full-power state using ACPI. | |
883 | * @dev: Device to put into the full-power state. | |
884 | * | |
885 | * Put the given device into the full-power state using the standard ACPI | |
886 | * mechanism during system transition to the working state. Set the power | |
887 | * state of the device to ACPI D0 and disable remote wakeup. | |
888 | */ | |
889 | int acpi_dev_resume_early(struct device *dev) | |
890 | { | |
891 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
892 | int error; | |
893 | ||
894 | if (!adev) | |
895 | return 0; | |
896 | ||
897 | error = acpi_dev_pm_full_power(adev); | |
898 | __acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false); | |
899 | return error; | |
900 | } | |
901 | EXPORT_SYMBOL_GPL(acpi_dev_resume_early); | |
902 | ||
903 | /** | |
904 | * acpi_subsys_prepare - Prepare device for system transition to a sleep state. | |
905 | * @dev: Device to prepare. | |
906 | */ | |
907 | int acpi_subsys_prepare(struct device *dev) | |
908 | { | |
909 | /* | |
910 | * Follow PCI and resume devices suspended at run time before running | |
911 | * their system suspend callbacks. | |
912 | */ | |
913 | pm_runtime_resume(dev); | |
914 | return pm_generic_prepare(dev); | |
915 | } | |
916 | EXPORT_SYMBOL_GPL(acpi_subsys_prepare); | |
917 | ||
918 | /** | |
919 | * acpi_subsys_suspend_late - Suspend device using ACPI. | |
920 | * @dev: Device to suspend. | |
921 | * | |
922 | * Carry out the generic late suspend procedure for @dev and use ACPI to put | |
923 | * it into a low-power state during system transition into a sleep state. | |
924 | */ | |
925 | int acpi_subsys_suspend_late(struct device *dev) | |
926 | { | |
927 | int ret = pm_generic_suspend_late(dev); | |
928 | return ret ? ret : acpi_dev_suspend_late(dev); | |
929 | } | |
930 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); | |
931 | ||
932 | /** | |
933 | * acpi_subsys_resume_early - Resume device using ACPI. | |
934 | * @dev: Device to Resume. | |
935 | * | |
936 | * Use ACPI to put the given device into the full-power state and carry out the | |
937 | * generic early resume procedure for it during system transition into the | |
938 | * working state. | |
939 | */ | |
940 | int acpi_subsys_resume_early(struct device *dev) | |
941 | { | |
942 | int ret = acpi_dev_resume_early(dev); | |
943 | return ret ? ret : pm_generic_resume_early(dev); | |
944 | } | |
945 | EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); | |
946 | #endif /* CONFIG_PM_SLEEP */ | |
947 | ||
948 | static struct dev_pm_domain acpi_general_pm_domain = { | |
949 | .ops = { | |
950 | #ifdef CONFIG_PM_RUNTIME | |
951 | .runtime_suspend = acpi_subsys_runtime_suspend, | |
952 | .runtime_resume = acpi_subsys_runtime_resume, | |
e5cc8ef3 RW |
953 | #endif |
954 | #ifdef CONFIG_PM_SLEEP | |
955 | .prepare = acpi_subsys_prepare, | |
956 | .suspend_late = acpi_subsys_suspend_late, | |
957 | .resume_early = acpi_subsys_resume_early, | |
958 | .poweroff_late = acpi_subsys_suspend_late, | |
959 | .restore_early = acpi_subsys_resume_early, | |
960 | #endif | |
961 | }, | |
962 | }; | |
963 | ||
964 | /** | |
965 | * acpi_dev_pm_attach - Prepare device for ACPI power management. | |
966 | * @dev: Device to prepare. | |
b88ce2a4 | 967 | * @power_on: Whether or not to power on the device. |
e5cc8ef3 RW |
968 | * |
969 | * If @dev has a valid ACPI handle that has a valid struct acpi_device object | |
970 | * attached to it, install a wakeup notification handler for the device and | |
b88ce2a4 RW |
971 | * add it to the general ACPI PM domain. If @power_on is set, the device will |
972 | * be put into the ACPI D0 state before the function returns. | |
e5cc8ef3 RW |
973 | * |
974 | * This assumes that the @dev's bus type uses generic power management callbacks | |
975 | * (or doesn't use any power management callbacks at all). | |
976 | * | |
977 | * Callers must ensure proper synchronization of this function with power | |
978 | * management callbacks. | |
979 | */ | |
b88ce2a4 | 980 | int acpi_dev_pm_attach(struct device *dev, bool power_on) |
e5cc8ef3 RW |
981 | { |
982 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
983 | ||
984 | if (!adev) | |
985 | return -ENODEV; | |
986 | ||
987 | if (dev->pm_domain) | |
988 | return -EEXIST; | |
989 | ||
990 | acpi_add_pm_notifier(adev, acpi_wakeup_device, dev); | |
991 | dev->pm_domain = &acpi_general_pm_domain; | |
b88ce2a4 RW |
992 | if (power_on) { |
993 | acpi_dev_pm_full_power(adev); | |
994 | __acpi_device_run_wake(adev, false); | |
995 | } | |
e5cc8ef3 RW |
996 | return 0; |
997 | } | |
998 | EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); | |
999 | ||
1000 | /** | |
1001 | * acpi_dev_pm_detach - Remove ACPI power management from the device. | |
1002 | * @dev: Device to take care of. | |
b88ce2a4 | 1003 | * @power_off: Whether or not to try to remove power from the device. |
e5cc8ef3 RW |
1004 | * |
1005 | * Remove the device from the general ACPI PM domain and remove its wakeup | |
b88ce2a4 RW |
1006 | * notifier. If @power_off is set, additionally remove power from the device if |
1007 | * possible. | |
e5cc8ef3 RW |
1008 | * |
1009 | * Callers must ensure proper synchronization of this function with power | |
1010 | * management callbacks. | |
1011 | */ | |
b88ce2a4 | 1012 | void acpi_dev_pm_detach(struct device *dev, bool power_off) |
e5cc8ef3 RW |
1013 | { |
1014 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
1015 | ||
1016 | if (adev && dev->pm_domain == &acpi_general_pm_domain) { | |
1017 | dev->pm_domain = NULL; | |
1018 | acpi_remove_pm_notifier(adev, acpi_wakeup_device); | |
b88ce2a4 RW |
1019 | if (power_off) { |
1020 | /* | |
1021 | * If the device's PM QoS resume latency limit or flags | |
1022 | * have been exposed to user space, they have to be | |
1023 | * hidden at this point, so that they don't affect the | |
1024 | * choice of the low-power state to put the device into. | |
1025 | */ | |
1026 | dev_pm_qos_hide_latency_limit(dev); | |
1027 | dev_pm_qos_hide_flags(dev); | |
1028 | __acpi_device_run_wake(adev, false); | |
1029 | acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
1030 | } | |
e5cc8ef3 RW |
1031 | } |
1032 | } | |
1033 | EXPORT_SYMBOL_GPL(acpi_dev_pm_detach); | |
bc9b6407 RW |
1034 | |
1035 | /** | |
1036 | * acpi_dev_pm_add_dependent - Add physical device depending for PM. | |
1037 | * @handle: Handle of ACPI device node. | |
1038 | * @depdev: Device depending on that node for PM. | |
1039 | */ | |
1040 | void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev) | |
1041 | { | |
1042 | struct acpi_device_physical_node *dep; | |
1043 | struct acpi_device *adev; | |
1044 | ||
1045 | if (!depdev || acpi_bus_get_device(handle, &adev)) | |
1046 | return; | |
1047 | ||
1048 | mutex_lock(&adev->physical_node_lock); | |
1049 | ||
1050 | list_for_each_entry(dep, &adev->power_dependent, node) | |
1051 | if (dep->dev == depdev) | |
1052 | goto out; | |
1053 | ||
1054 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); | |
1055 | if (dep) { | |
1056 | dep->dev = depdev; | |
1057 | list_add_tail(&dep->node, &adev->power_dependent); | |
1058 | } | |
1059 | ||
1060 | out: | |
1061 | mutex_unlock(&adev->physical_node_lock); | |
1062 | } | |
1063 | EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent); | |
1064 | ||
1065 | /** | |
1066 | * acpi_dev_pm_remove_dependent - Remove physical device depending for PM. | |
1067 | * @handle: Handle of ACPI device node. | |
1068 | * @depdev: Device depending on that node for PM. | |
1069 | */ | |
1070 | void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev) | |
1071 | { | |
1072 | struct acpi_device_physical_node *dep; | |
1073 | struct acpi_device *adev; | |
1074 | ||
1075 | if (!depdev || acpi_bus_get_device(handle, &adev)) | |
1076 | return; | |
1077 | ||
1078 | mutex_lock(&adev->physical_node_lock); | |
1079 | ||
1080 | list_for_each_entry(dep, &adev->power_dependent, node) | |
1081 | if (dep->dev == depdev) { | |
1082 | list_del(&dep->node); | |
1083 | kfree(dep); | |
1084 | break; | |
1085 | } | |
1086 | ||
1087 | mutex_unlock(&adev->physical_node_lock); | |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent); | |
ec4602a9 | 1090 | #endif /* CONFIG_PM */ |