Commit | Line | Data |
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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 | ||
7b199811 | 25 | #include <linux/acpi.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 | 30 | |
9ce4e607 RW |
31 | #include "internal.h" |
32 | ||
33 | #define _COMPONENT ACPI_POWER_COMPONENT | |
34 | ACPI_MODULE_NAME("device_pm"); | |
ec2cd81c | 35 | |
9ce4e607 RW |
36 | /** |
37 | * acpi_power_state_string - String representation of ACPI device power state. | |
38 | * @state: ACPI device power state to return the string representation of. | |
39 | */ | |
40 | const char *acpi_power_state_string(int state) | |
41 | { | |
42 | switch (state) { | |
43 | case ACPI_STATE_D0: | |
44 | return "D0"; | |
45 | case ACPI_STATE_D1: | |
46 | return "D1"; | |
47 | case ACPI_STATE_D2: | |
48 | return "D2"; | |
49 | case ACPI_STATE_D3_HOT: | |
50 | return "D3hot"; | |
51 | case ACPI_STATE_D3_COLD: | |
898fee4f | 52 | return "D3cold"; |
9ce4e607 RW |
53 | default: |
54 | return "(unknown)"; | |
55 | } | |
56 | } | |
57 | ||
58 | /** | |
59 | * acpi_device_get_power - Get power state of an ACPI device. | |
60 | * @device: Device to get the power state of. | |
61 | * @state: Place to store the power state of the device. | |
62 | * | |
63 | * This function does not update the device's power.state field, but it may | |
64 | * update its parent's power.state field (when the parent's power state is | |
65 | * unknown and the device's power state turns out to be D0). | |
66 | */ | |
67 | int acpi_device_get_power(struct acpi_device *device, int *state) | |
68 | { | |
69 | int result = ACPI_STATE_UNKNOWN; | |
70 | ||
71 | if (!device || !state) | |
72 | return -EINVAL; | |
73 | ||
74 | if (!device->flags.power_manageable) { | |
75 | /* TBD: Non-recursive algorithm for walking up hierarchy. */ | |
76 | *state = device->parent ? | |
77 | device->parent->power.state : ACPI_STATE_D0; | |
78 | goto out; | |
79 | } | |
80 | ||
81 | /* | |
75eb2d13 RW |
82 | * Get the device's power state from power resources settings and _PSC, |
83 | * if available. | |
9ce4e607 | 84 | */ |
75eb2d13 RW |
85 | if (device->power.flags.power_resources) { |
86 | int error = acpi_power_get_inferred_state(device, &result); | |
87 | if (error) | |
88 | return error; | |
89 | } | |
9ce4e607 | 90 | if (device->power.flags.explicit_get) { |
75eb2d13 | 91 | acpi_handle handle = device->handle; |
9ce4e607 | 92 | unsigned long long psc; |
75eb2d13 RW |
93 | acpi_status status; |
94 | ||
95 | status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc); | |
9ce4e607 RW |
96 | if (ACPI_FAILURE(status)) |
97 | return -ENODEV; | |
98 | ||
75eb2d13 RW |
99 | /* |
100 | * The power resources settings may indicate a power state | |
101 | * shallower than the actual power state of the device. | |
102 | * | |
103 | * Moreover, on systems predating ACPI 4.0, if the device | |
104 | * doesn't depend on any power resources and _PSC returns 3, | |
105 | * that means "power off". We need to maintain compatibility | |
106 | * with those systems. | |
107 | */ | |
108 | if (psc > result && psc < ACPI_STATE_D3_COLD) | |
109 | result = psc; | |
110 | else if (result == ACPI_STATE_UNKNOWN) | |
111 | result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_COLD : psc; | |
9ce4e607 RW |
112 | } |
113 | ||
114 | /* | |
115 | * If we were unsure about the device parent's power state up to this | |
116 | * point, the fact that the device is in D0 implies that the parent has | |
644f17ad | 117 | * to be in D0 too, except if ignore_parent is set. |
9ce4e607 | 118 | */ |
644f17ad MW |
119 | if (!device->power.flags.ignore_parent && device->parent |
120 | && device->parent->power.state == ACPI_STATE_UNKNOWN | |
9ce4e607 RW |
121 | && result == ACPI_STATE_D0) |
122 | device->parent->power.state = ACPI_STATE_D0; | |
123 | ||
124 | *state = result; | |
125 | ||
126 | out: | |
127 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", | |
128 | device->pnp.bus_id, acpi_power_state_string(*state))); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
9c0f45e3 RW |
133 | static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
134 | { | |
135 | if (adev->power.states[state].flags.explicit_set) { | |
136 | char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; | |
137 | acpi_status status; | |
138 | ||
139 | status = acpi_evaluate_object(adev->handle, method, NULL, NULL); | |
140 | if (ACPI_FAILURE(status)) | |
141 | return -ENODEV; | |
142 | } | |
143 | return 0; | |
144 | } | |
145 | ||
9ce4e607 RW |
146 | /** |
147 | * acpi_device_set_power - Set power state of an ACPI device. | |
148 | * @device: Device to set the power state of. | |
149 | * @state: New power state to set. | |
150 | * | |
151 | * Callers must ensure that the device is power manageable before using this | |
152 | * function. | |
153 | */ | |
154 | int acpi_device_set_power(struct acpi_device *device, int state) | |
155 | { | |
156 | int result = 0; | |
9ce4e607 RW |
157 | bool cut_power = false; |
158 | ||
2c7d132a RW |
159 | if (!device || !device->flags.power_manageable |
160 | || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) | |
9ce4e607 RW |
161 | return -EINVAL; |
162 | ||
163 | /* Make sure this is a valid target state */ | |
164 | ||
165 | if (state == device->power.state) { | |
b69137a7 RW |
166 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", |
167 | device->pnp.bus_id, | |
9ce4e607 RW |
168 | acpi_power_state_string(state))); |
169 | return 0; | |
170 | } | |
171 | ||
172 | if (!device->power.states[state].flags.valid) { | |
b69137a7 RW |
173 | dev_warn(&device->dev, "Power state %s not supported\n", |
174 | acpi_power_state_string(state)); | |
9ce4e607 RW |
175 | return -ENODEV; |
176 | } | |
644f17ad MW |
177 | if (!device->power.flags.ignore_parent && |
178 | device->parent && (state < device->parent->power.state)) { | |
b69137a7 | 179 | dev_warn(&device->dev, |
593298e6 AL |
180 | "Cannot transition to power state %s for parent in %s\n", |
181 | acpi_power_state_string(state), | |
182 | acpi_power_state_string(device->parent->power.state)); | |
9ce4e607 RW |
183 | return -ENODEV; |
184 | } | |
185 | ||
186 | /* For D3cold we should first transition into D3hot. */ | |
187 | if (state == ACPI_STATE_D3_COLD | |
188 | && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) { | |
189 | state = ACPI_STATE_D3_HOT; | |
9ce4e607 RW |
190 | cut_power = true; |
191 | } | |
192 | ||
e78adb75 RW |
193 | if (state < device->power.state && state != ACPI_STATE_D0 |
194 | && device->power.state >= ACPI_STATE_D3_HOT) { | |
b69137a7 RW |
195 | dev_warn(&device->dev, |
196 | "Cannot transition to non-D0 state from D3\n"); | |
e78adb75 RW |
197 | return -ENODEV; |
198 | } | |
199 | ||
9ce4e607 RW |
200 | /* |
201 | * Transition Power | |
202 | * ---------------- | |
e78adb75 RW |
203 | * In accordance with the ACPI specification first apply power (via |
204 | * power resources) and then evalute _PSx. | |
9ce4e607 | 205 | */ |
e78adb75 RW |
206 | if (device->power.flags.power_resources) { |
207 | result = acpi_power_transition(device, state); | |
9c0f45e3 RW |
208 | if (result) |
209 | goto end; | |
9ce4e607 | 210 | } |
e78adb75 RW |
211 | result = acpi_dev_pm_explicit_set(device, state); |
212 | if (result) | |
213 | goto end; | |
9ce4e607 | 214 | |
e5656271 RW |
215 | if (cut_power) { |
216 | device->power.state = state; | |
217 | state = ACPI_STATE_D3_COLD; | |
218 | result = acpi_power_transition(device, state); | |
219 | } | |
9ce4e607 | 220 | |
e78adb75 RW |
221 | end: |
222 | if (result) { | |
b69137a7 RW |
223 | dev_warn(&device->dev, "Failed to change power state to %s\n", |
224 | acpi_power_state_string(state)); | |
e78adb75 | 225 | } else { |
9ce4e607 RW |
226 | device->power.state = state; |
227 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
228 | "Device [%s] transitioned to %s\n", | |
229 | device->pnp.bus_id, | |
230 | acpi_power_state_string(state))); | |
231 | } | |
232 | ||
233 | return result; | |
234 | } | |
235 | EXPORT_SYMBOL(acpi_device_set_power); | |
236 | ||
237 | int acpi_bus_set_power(acpi_handle handle, int state) | |
238 | { | |
239 | struct acpi_device *device; | |
240 | int result; | |
241 | ||
242 | result = acpi_bus_get_device(handle, &device); | |
243 | if (result) | |
244 | return result; | |
245 | ||
9ce4e607 RW |
246 | return acpi_device_set_power(device, state); |
247 | } | |
248 | EXPORT_SYMBOL(acpi_bus_set_power); | |
249 | ||
250 | int acpi_bus_init_power(struct acpi_device *device) | |
251 | { | |
252 | int state; | |
253 | int result; | |
254 | ||
255 | if (!device) | |
256 | return -EINVAL; | |
257 | ||
258 | device->power.state = ACPI_STATE_UNKNOWN; | |
202317a5 RW |
259 | if (!acpi_device_is_present(device)) |
260 | return 0; | |
9ce4e607 RW |
261 | |
262 | result = acpi_device_get_power(device, &state); | |
263 | if (result) | |
264 | return result; | |
265 | ||
a2367807 | 266 | if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { |
9ce4e607 | 267 | result = acpi_power_on_resources(device, state); |
a2367807 RW |
268 | if (result) |
269 | return result; | |
9ce4e607 | 270 | |
9c0f45e3 RW |
271 | result = acpi_dev_pm_explicit_set(device, state); |
272 | if (result) | |
273 | return result; | |
b3785492 | 274 | } else if (state == ACPI_STATE_UNKNOWN) { |
7cd8407d RW |
275 | /* |
276 | * No power resources and missing _PSC? Cross fingers and make | |
277 | * it D0 in hope that this is what the BIOS put the device into. | |
278 | * [We tried to force D0 here by executing _PS0, but that broke | |
279 | * Toshiba P870-303 in a nasty way.] | |
280 | */ | |
b3785492 | 281 | state = ACPI_STATE_D0; |
a2367807 RW |
282 | } |
283 | device->power.state = state; | |
284 | return 0; | |
9ce4e607 RW |
285 | } |
286 | ||
b9e95fc6 RW |
287 | /** |
288 | * acpi_device_fix_up_power - Force device with missing _PSC into D0. | |
289 | * @device: Device object whose power state is to be fixed up. | |
290 | * | |
291 | * Devices without power resources and _PSC, but having _PS0 and _PS3 defined, | |
292 | * are assumed to be put into D0 by the BIOS. However, in some cases that may | |
293 | * not be the case and this function should be used then. | |
294 | */ | |
295 | int acpi_device_fix_up_power(struct acpi_device *device) | |
296 | { | |
297 | int ret = 0; | |
298 | ||
299 | if (!device->power.flags.power_resources | |
300 | && !device->power.flags.explicit_get | |
301 | && device->power.state == ACPI_STATE_D0) | |
302 | ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
303 | ||
304 | return ret; | |
305 | } | |
306 | ||
202317a5 | 307 | int acpi_device_update_power(struct acpi_device *device, int *state_p) |
9ce4e607 | 308 | { |
9ce4e607 RW |
309 | int state; |
310 | int result; | |
311 | ||
202317a5 RW |
312 | if (device->power.state == ACPI_STATE_UNKNOWN) { |
313 | result = acpi_bus_init_power(device); | |
314 | if (!result && state_p) | |
315 | *state_p = device->power.state; | |
316 | ||
9ce4e607 | 317 | return result; |
202317a5 | 318 | } |
9ce4e607 RW |
319 | |
320 | result = acpi_device_get_power(device, &state); | |
321 | if (result) | |
322 | return result; | |
323 | ||
91bdad0b | 324 | if (state == ACPI_STATE_UNKNOWN) { |
511d5c42 | 325 | state = ACPI_STATE_D0; |
91bdad0b RW |
326 | result = acpi_device_set_power(device, state); |
327 | if (result) | |
328 | return result; | |
329 | } else { | |
330 | if (device->power.flags.power_resources) { | |
331 | /* | |
332 | * We don't need to really switch the state, bu we need | |
333 | * to update the power resources' reference counters. | |
334 | */ | |
335 | result = acpi_power_transition(device, state); | |
336 | if (result) | |
337 | return result; | |
338 | } | |
339 | device->power.state = state; | |
340 | } | |
341 | if (state_p) | |
9ce4e607 RW |
342 | *state_p = state; |
343 | ||
91bdad0b | 344 | return 0; |
9ce4e607 | 345 | } |
202317a5 RW |
346 | |
347 | int acpi_bus_update_power(acpi_handle handle, int *state_p) | |
348 | { | |
349 | struct acpi_device *device; | |
350 | int result; | |
351 | ||
352 | result = acpi_bus_get_device(handle, &device); | |
353 | return result ? result : acpi_device_update_power(device, state_p); | |
354 | } | |
9ce4e607 RW |
355 | EXPORT_SYMBOL_GPL(acpi_bus_update_power); |
356 | ||
357 | bool acpi_bus_power_manageable(acpi_handle handle) | |
358 | { | |
359 | struct acpi_device *device; | |
360 | int result; | |
361 | ||
362 | result = acpi_bus_get_device(handle, &device); | |
363 | return result ? false : device->flags.power_manageable; | |
364 | } | |
365 | EXPORT_SYMBOL(acpi_bus_power_manageable); | |
366 | ||
ec4602a9 RW |
367 | #ifdef CONFIG_PM |
368 | static DEFINE_MUTEX(acpi_pm_notifier_lock); | |
369 | ||
c072530f RW |
370 | static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) |
371 | { | |
372 | struct acpi_device *adev; | |
373 | ||
374 | if (val != ACPI_NOTIFY_DEVICE_WAKE) | |
375 | return; | |
376 | ||
377 | adev = acpi_bus_get_acpi_device(handle); | |
378 | if (!adev) | |
379 | return; | |
380 | ||
381 | mutex_lock(&acpi_pm_notifier_lock); | |
382 | ||
383 | if (adev->wakeup.flags.notifier_present) { | |
384 | __pm_wakeup_event(adev->wakeup.ws, 0); | |
385 | if (adev->wakeup.context.work.func) | |
386 | queue_pm_work(&adev->wakeup.context.work); | |
387 | } | |
388 | ||
389 | mutex_unlock(&acpi_pm_notifier_lock); | |
390 | ||
391 | acpi_bus_put_acpi_device(adev); | |
392 | } | |
393 | ||
ec4602a9 | 394 | /** |
c072530f RW |
395 | * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. |
396 | * @adev: ACPI device to add the notify handler for. | |
397 | * @dev: Device to generate a wakeup event for while handling the notification. | |
398 | * @work_func: Work function to execute when handling the notification. | |
ec4602a9 RW |
399 | * |
400 | * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of | |
401 | * PM wakeup events. For example, wakeup events may be generated for bridges | |
402 | * if one of the devices below the bridge is signaling wakeup, even if the | |
403 | * bridge itself doesn't have a wakeup GPE associated with it. | |
404 | */ | |
c072530f RW |
405 | acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, |
406 | void (*work_func)(struct work_struct *work)) | |
ec4602a9 RW |
407 | { |
408 | acpi_status status = AE_ALREADY_EXISTS; | |
409 | ||
c072530f RW |
410 | if (!dev && !work_func) |
411 | return AE_BAD_PARAMETER; | |
412 | ||
ec4602a9 RW |
413 | mutex_lock(&acpi_pm_notifier_lock); |
414 | ||
415 | if (adev->wakeup.flags.notifier_present) | |
416 | goto out; | |
417 | ||
c072530f RW |
418 | adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev)); |
419 | adev->wakeup.context.dev = dev; | |
420 | if (work_func) | |
421 | INIT_WORK(&adev->wakeup.context.work, work_func); | |
422 | ||
423 | status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, | |
424 | acpi_pm_notify_handler, NULL); | |
ec4602a9 RW |
425 | if (ACPI_FAILURE(status)) |
426 | goto out; | |
427 | ||
428 | adev->wakeup.flags.notifier_present = true; | |
429 | ||
430 | out: | |
431 | mutex_unlock(&acpi_pm_notifier_lock); | |
432 | return status; | |
433 | } | |
434 | ||
435 | /** | |
436 | * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
437 | * @adev: ACPI device to remove the notifier from. | |
438 | */ | |
c072530f | 439 | acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) |
ec4602a9 RW |
440 | { |
441 | acpi_status status = AE_BAD_PARAMETER; | |
442 | ||
443 | mutex_lock(&acpi_pm_notifier_lock); | |
444 | ||
445 | if (!adev->wakeup.flags.notifier_present) | |
446 | goto out; | |
447 | ||
448 | status = acpi_remove_notify_handler(adev->handle, | |
449 | ACPI_SYSTEM_NOTIFY, | |
c072530f | 450 | acpi_pm_notify_handler); |
ec4602a9 RW |
451 | if (ACPI_FAILURE(status)) |
452 | goto out; | |
453 | ||
c072530f RW |
454 | if (adev->wakeup.context.work.func) { |
455 | cancel_work_sync(&adev->wakeup.context.work); | |
456 | adev->wakeup.context.work.func = NULL; | |
457 | } | |
458 | adev->wakeup.context.dev = NULL; | |
459 | wakeup_source_unregister(adev->wakeup.ws); | |
460 | ||
ec4602a9 RW |
461 | adev->wakeup.flags.notifier_present = false; |
462 | ||
463 | out: | |
464 | mutex_unlock(&acpi_pm_notifier_lock); | |
465 | return status; | |
466 | } | |
467 | ||
9ce4e607 RW |
468 | bool acpi_bus_can_wakeup(acpi_handle handle) |
469 | { | |
470 | struct acpi_device *device; | |
471 | int result; | |
472 | ||
473 | result = acpi_bus_get_device(handle, &device); | |
474 | return result ? false : device->wakeup.flags.valid; | |
475 | } | |
476 | EXPORT_SYMBOL(acpi_bus_can_wakeup); | |
477 | ||
86b3832c | 478 | /** |
b25c77ef | 479 | * acpi_dev_pm_get_state - Get preferred power state of ACPI device. |
86b3832c RW |
480 | * @dev: Device whose preferred target power state to return. |
481 | * @adev: ACPI device node corresponding to @dev. | |
482 | * @target_state: System state to match the resultant device state. | |
fa1675b5 RW |
483 | * @d_min_p: Location to store the highest power state available to the device. |
484 | * @d_max_p: Location to store the lowest power state available to the device. | |
86b3832c | 485 | * |
fa1675b5 RW |
486 | * Find the lowest power (highest number) and highest power (lowest number) ACPI |
487 | * device power states that the device can be in while the system is in the | |
488 | * state represented by @target_state. Store the integer numbers representing | |
489 | * those stats in the memory locations pointed to by @d_max_p and @d_min_p, | |
490 | * respectively. | |
86b3832c RW |
491 | * |
492 | * Callers must ensure that @dev and @adev are valid pointers and that @adev | |
493 | * actually corresponds to @dev before using this function. | |
fa1675b5 RW |
494 | * |
495 | * Returns 0 on success or -ENODATA when one of the ACPI methods fails or | |
496 | * returns a value that doesn't make sense. The memory locations pointed to by | |
497 | * @d_max_p and @d_min_p are only modified on success. | |
86b3832c | 498 | */ |
b25c77ef | 499 | static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, |
fa1675b5 | 500 | u32 target_state, int *d_min_p, int *d_max_p) |
86b3832c | 501 | { |
fa1675b5 RW |
502 | char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; |
503 | acpi_handle handle = adev->handle; | |
504 | unsigned long long ret; | |
505 | int d_min, d_max; | |
86b3832c | 506 | bool wakeup = false; |
fa1675b5 | 507 | acpi_status status; |
86b3832c | 508 | |
86b3832c | 509 | /* |
fa1675b5 RW |
510 | * If the system state is S0, the lowest power state the device can be |
511 | * in is D3cold, unless the device has _S0W and is supposed to signal | |
512 | * wakeup, in which case the return value of _S0W has to be used as the | |
513 | * lowest power state available to the device. | |
86b3832c RW |
514 | */ |
515 | d_min = ACPI_STATE_D0; | |
4c164ae7 | 516 | d_max = ACPI_STATE_D3_COLD; |
86b3832c RW |
517 | |
518 | /* | |
519 | * If present, _SxD methods return the minimum D-state (highest power | |
520 | * state) we can use for the corresponding S-states. Otherwise, the | |
521 | * minimum D-state is D0 (ACPI 3.x). | |
86b3832c RW |
522 | */ |
523 | if (target_state > ACPI_STATE_S0) { | |
fa1675b5 RW |
524 | /* |
525 | * We rely on acpi_evaluate_integer() not clobbering the integer | |
526 | * provided if AE_NOT_FOUND is returned. | |
527 | */ | |
528 | ret = d_min; | |
529 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
530 | if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) | |
531 | || ret > ACPI_STATE_D3_COLD) | |
532 | return -ENODATA; | |
533 | ||
534 | /* | |
535 | * We need to handle legacy systems where D3hot and D3cold are | |
536 | * the same and 3 is returned in both cases, so fall back to | |
537 | * D3cold if D3hot is not a valid state. | |
538 | */ | |
539 | if (!adev->power.states[ret].flags.valid) { | |
540 | if (ret == ACPI_STATE_D3_HOT) | |
541 | ret = ACPI_STATE_D3_COLD; | |
542 | else | |
543 | return -ENODATA; | |
544 | } | |
545 | d_min = ret; | |
86b3832c RW |
546 | wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid |
547 | && adev->wakeup.sleep_state >= target_state; | |
548 | } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != | |
549 | PM_QOS_FLAGS_NONE) { | |
550 | wakeup = adev->wakeup.flags.valid; | |
551 | } | |
552 | ||
553 | /* | |
554 | * If _PRW says we can wake up the system from the target sleep state, | |
555 | * the D-state returned by _SxD is sufficient for that (we assume a | |
556 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
557 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
558 | * can wake the system. _S0W may be valid, too. | |
559 | */ | |
560 | if (wakeup) { | |
fa1675b5 RW |
561 | method[3] = 'W'; |
562 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
563 | if (status == AE_NOT_FOUND) { | |
564 | if (target_state > ACPI_STATE_S0) | |
86b3832c | 565 | d_max = d_min; |
fa1675b5 RW |
566 | } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { |
567 | /* Fall back to D3cold if ret is not a valid state. */ | |
568 | if (!adev->power.states[ret].flags.valid) | |
569 | ret = ACPI_STATE_D3_COLD; | |
570 | ||
571 | d_max = ret > d_min ? ret : d_min; | |
572 | } else { | |
573 | return -ENODATA; | |
86b3832c RW |
574 | } |
575 | } | |
576 | ||
86b3832c RW |
577 | if (d_min_p) |
578 | *d_min_p = d_min; | |
fa1675b5 RW |
579 | |
580 | if (d_max_p) | |
581 | *d_max_p = d_max; | |
582 | ||
583 | return 0; | |
86b3832c | 584 | } |
cd7bd02d | 585 | |
a6ae7594 RW |
586 | /** |
587 | * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. | |
588 | * @dev: Device whose preferred target power state to return. | |
589 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
590 | * @d_max_in: Deepest low-power state to take into consideration. | |
591 | * Return value: Preferred power state of the device on success, -ENODEV | |
fa1675b5 RW |
592 | * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is |
593 | * incorrect, or -ENODATA on ACPI method failure. | |
a6ae7594 RW |
594 | * |
595 | * The caller must ensure that @dev is valid before using this function. | |
596 | */ | |
597 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) | |
598 | { | |
a6ae7594 | 599 | struct acpi_device *adev; |
9b5c7a5a | 600 | int ret, d_min, d_max; |
fa1675b5 RW |
601 | |
602 | if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) | |
603 | return -EINVAL; | |
604 | ||
605 | if (d_max_in > ACPI_STATE_D3_HOT) { | |
606 | enum pm_qos_flags_status stat; | |
607 | ||
608 | stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); | |
609 | if (stat == PM_QOS_FLAGS_ALL) | |
610 | d_max_in = ACPI_STATE_D3_HOT; | |
611 | } | |
a6ae7594 | 612 | |
17653a3e RW |
613 | adev = ACPI_COMPANION(dev); |
614 | if (!adev) { | |
615 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
616 | return -ENODEV; |
617 | } | |
618 | ||
fa1675b5 | 619 | ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), |
9b5c7a5a | 620 | &d_min, &d_max); |
fa1675b5 RW |
621 | if (ret) |
622 | return ret; | |
623 | ||
9b5c7a5a | 624 | if (d_max_in < d_min) |
fa1675b5 RW |
625 | return -EINVAL; |
626 | ||
627 | if (d_max > d_max_in) { | |
9b5c7a5a | 628 | for (d_max = d_max_in; d_max > d_min; d_max--) { |
fa1675b5 RW |
629 | if (adev->power.states[d_max].flags.valid) |
630 | break; | |
631 | } | |
632 | } | |
9b5c7a5a RW |
633 | |
634 | if (d_min_p) | |
635 | *d_min_p = d_min; | |
636 | ||
fa1675b5 | 637 | return d_max; |
a6ae7594 RW |
638 | } |
639 | EXPORT_SYMBOL(acpi_pm_device_sleep_state); | |
640 | ||
e5cc8ef3 | 641 | /** |
c072530f RW |
642 | * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. |
643 | * @work: Work item to handle. | |
e5cc8ef3 | 644 | */ |
c072530f | 645 | static void acpi_pm_notify_work_func(struct work_struct *work) |
e5cc8ef3 | 646 | { |
c072530f | 647 | struct device *dev; |
e5cc8ef3 | 648 | |
c072530f RW |
649 | dev = container_of(work, struct acpi_device_wakeup_context, work)->dev; |
650 | if (dev) { | |
e5cc8ef3 RW |
651 | pm_wakeup_event(dev, 0); |
652 | pm_runtime_resume(dev); | |
653 | } | |
654 | } | |
655 | ||
cd7bd02d | 656 | /** |
f35cec25 RW |
657 | * acpi_device_wakeup - Enable/disable wakeup functionality for device. |
658 | * @adev: ACPI device to enable/disable wakeup functionality for. | |
659 | * @target_state: State the system is transitioning into. | |
cd7bd02d RW |
660 | * @enable: Whether to enable or disable the wakeup functionality. |
661 | * | |
dee8370c RW |
662 | * Enable/disable the GPE associated with @adev so that it can generate |
663 | * wakeup signals for the device in response to external (remote) events and | |
664 | * enable/disable device wakeup power. | |
665 | * | |
666 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
667 | * this function. | |
668 | */ | |
f35cec25 RW |
669 | static int acpi_device_wakeup(struct acpi_device *adev, u32 target_state, |
670 | bool enable) | |
dee8370c RW |
671 | { |
672 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
673 | ||
674 | if (enable) { | |
675 | acpi_status res; | |
676 | int error; | |
677 | ||
f35cec25 | 678 | error = acpi_enable_wakeup_device_power(adev, target_state); |
dee8370c RW |
679 | if (error) |
680 | return error; | |
681 | ||
682 | res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
683 | if (ACPI_FAILURE(res)) { | |
684 | acpi_disable_wakeup_device_power(adev); | |
685 | return -EIO; | |
686 | } | |
687 | } else { | |
688 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
689 | acpi_disable_wakeup_device_power(adev); | |
690 | } | |
691 | return 0; | |
692 | } | |
693 | ||
f35cec25 | 694 | #ifdef CONFIG_PM_RUNTIME |
dee8370c RW |
695 | /** |
696 | * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. | |
697 | * @dev: Device to enable/disable the platform to wake up. | |
698 | * @enable: Whether to enable or disable the wakeup functionality. | |
cd7bd02d RW |
699 | */ |
700 | int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) | |
701 | { | |
dee8370c | 702 | struct acpi_device *adev; |
cd7bd02d RW |
703 | |
704 | if (!device_run_wake(phys_dev)) | |
705 | return -EINVAL; | |
706 | ||
17653a3e RW |
707 | adev = ACPI_COMPANION(phys_dev); |
708 | if (!adev) { | |
709 | dev_dbg(phys_dev, "ACPI companion missing in %s!\n", __func__); | |
cd7bd02d RW |
710 | return -ENODEV; |
711 | } | |
712 | ||
f35cec25 | 713 | return acpi_device_wakeup(adev, enable, ACPI_STATE_S0); |
cd7bd02d RW |
714 | } |
715 | EXPORT_SYMBOL(acpi_pm_device_run_wake); | |
716 | #endif /* CONFIG_PM_RUNTIME */ | |
dee8370c | 717 | |
4d56410b | 718 | #ifdef CONFIG_PM_SLEEP |
a6ae7594 RW |
719 | /** |
720 | * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system. | |
721 | * @dev: Device to enable/desible to wake up the system from sleep states. | |
722 | * @enable: Whether to enable or disable @dev to wake up the system. | |
723 | */ | |
724 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
725 | { | |
a6ae7594 RW |
726 | struct acpi_device *adev; |
727 | int error; | |
728 | ||
729 | if (!device_can_wakeup(dev)) | |
730 | return -EINVAL; | |
731 | ||
17653a3e RW |
732 | adev = ACPI_COMPANION(dev); |
733 | if (!adev) { | |
734 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
735 | return -ENODEV; |
736 | } | |
737 | ||
f35cec25 | 738 | error = acpi_device_wakeup(adev, acpi_target_system_state(), enable); |
a6ae7594 RW |
739 | if (!error) |
740 | dev_info(dev, "System wakeup %s by ACPI\n", | |
741 | enable ? "enabled" : "disabled"); | |
742 | ||
743 | return error; | |
744 | } | |
dee8370c | 745 | #endif /* CONFIG_PM_SLEEP */ |
e5cc8ef3 | 746 | |
e5cc8ef3 RW |
747 | /** |
748 | * acpi_dev_pm_low_power - Put ACPI device into a low-power state. | |
749 | * @dev: Device to put into a low-power state. | |
750 | * @adev: ACPI device node corresponding to @dev. | |
751 | * @system_state: System state to choose the device state for. | |
752 | */ | |
753 | static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, | |
754 | u32 system_state) | |
755 | { | |
fa1675b5 | 756 | int ret, state; |
e5cc8ef3 RW |
757 | |
758 | if (!acpi_device_power_manageable(adev)) | |
759 | return 0; | |
760 | ||
fa1675b5 RW |
761 | ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); |
762 | return ret ? ret : acpi_device_set_power(adev, state); | |
e5cc8ef3 RW |
763 | } |
764 | ||
765 | /** | |
766 | * acpi_dev_pm_full_power - Put ACPI device into the full-power state. | |
767 | * @adev: ACPI device node to put into the full-power state. | |
768 | */ | |
769 | static int acpi_dev_pm_full_power(struct acpi_device *adev) | |
770 | { | |
771 | return acpi_device_power_manageable(adev) ? | |
772 | acpi_device_set_power(adev, ACPI_STATE_D0) : 0; | |
773 | } | |
774 | ||
775 | #ifdef CONFIG_PM_RUNTIME | |
776 | /** | |
777 | * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. | |
778 | * @dev: Device to put into a low-power state. | |
779 | * | |
780 | * Put the given device into a runtime low-power state using the standard ACPI | |
781 | * mechanism. Set up remote wakeup if desired, choose the state to put the | |
782 | * device into (this checks if remote wakeup is expected to work too), and set | |
783 | * the power state of the device. | |
784 | */ | |
785 | int acpi_dev_runtime_suspend(struct device *dev) | |
786 | { | |
79c0373f | 787 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
788 | bool remote_wakeup; |
789 | int error; | |
790 | ||
791 | if (!adev) | |
792 | return 0; | |
793 | ||
794 | remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > | |
795 | PM_QOS_FLAGS_NONE; | |
f35cec25 | 796 | error = acpi_device_wakeup(adev, ACPI_STATE_S0, remote_wakeup); |
e5cc8ef3 RW |
797 | if (remote_wakeup && error) |
798 | return -EAGAIN; | |
799 | ||
800 | error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
801 | if (error) | |
f35cec25 | 802 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
e5cc8ef3 RW |
803 | |
804 | return error; | |
805 | } | |
806 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); | |
807 | ||
808 | /** | |
809 | * acpi_dev_runtime_resume - Put device into the full-power state using ACPI. | |
810 | * @dev: Device to put into the full-power state. | |
811 | * | |
812 | * Put the given device into the full-power state using the standard ACPI | |
813 | * mechanism at run time. Set the power state of the device to ACPI D0 and | |
814 | * disable remote wakeup. | |
815 | */ | |
816 | int acpi_dev_runtime_resume(struct device *dev) | |
817 | { | |
79c0373f | 818 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
819 | int error; |
820 | ||
821 | if (!adev) | |
822 | return 0; | |
823 | ||
824 | error = acpi_dev_pm_full_power(adev); | |
f35cec25 | 825 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
e5cc8ef3 RW |
826 | return error; |
827 | } | |
828 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); | |
829 | ||
830 | /** | |
831 | * acpi_subsys_runtime_suspend - Suspend device using ACPI. | |
832 | * @dev: Device to suspend. | |
833 | * | |
834 | * Carry out the generic runtime suspend procedure for @dev and use ACPI to put | |
835 | * it into a runtime low-power state. | |
836 | */ | |
837 | int acpi_subsys_runtime_suspend(struct device *dev) | |
838 | { | |
839 | int ret = pm_generic_runtime_suspend(dev); | |
840 | return ret ? ret : acpi_dev_runtime_suspend(dev); | |
841 | } | |
842 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); | |
843 | ||
844 | /** | |
845 | * acpi_subsys_runtime_resume - Resume device using ACPI. | |
846 | * @dev: Device to Resume. | |
847 | * | |
848 | * Use ACPI to put the given device into the full-power state and carry out the | |
849 | * generic runtime resume procedure for it. | |
850 | */ | |
851 | int acpi_subsys_runtime_resume(struct device *dev) | |
852 | { | |
853 | int ret = acpi_dev_runtime_resume(dev); | |
854 | return ret ? ret : pm_generic_runtime_resume(dev); | |
855 | } | |
856 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); | |
857 | #endif /* CONFIG_PM_RUNTIME */ | |
858 | ||
859 | #ifdef CONFIG_PM_SLEEP | |
860 | /** | |
861 | * acpi_dev_suspend_late - Put device into a low-power state using ACPI. | |
862 | * @dev: Device to put into a low-power state. | |
863 | * | |
864 | * Put the given device into a low-power state during system transition to a | |
865 | * sleep state using the standard ACPI mechanism. Set up system wakeup if | |
866 | * desired, choose the state to put the device into (this checks if system | |
867 | * wakeup is expected to work too), and set the power state of the device. | |
868 | */ | |
869 | int acpi_dev_suspend_late(struct device *dev) | |
870 | { | |
79c0373f | 871 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
872 | u32 target_state; |
873 | bool wakeup; | |
874 | int error; | |
875 | ||
876 | if (!adev) | |
877 | return 0; | |
878 | ||
879 | target_state = acpi_target_system_state(); | |
880 | wakeup = device_may_wakeup(dev); | |
f35cec25 | 881 | error = acpi_device_wakeup(adev, target_state, wakeup); |
e5cc8ef3 RW |
882 | if (wakeup && error) |
883 | return error; | |
884 | ||
885 | error = acpi_dev_pm_low_power(dev, adev, target_state); | |
886 | if (error) | |
f35cec25 | 887 | acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); |
e5cc8ef3 RW |
888 | |
889 | return error; | |
890 | } | |
891 | EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); | |
892 | ||
893 | /** | |
894 | * acpi_dev_resume_early - Put device into the full-power state using ACPI. | |
895 | * @dev: Device to put into the full-power state. | |
896 | * | |
897 | * Put the given device into the full-power state using the standard ACPI | |
898 | * mechanism during system transition to the working state. Set the power | |
899 | * state of the device to ACPI D0 and disable remote wakeup. | |
900 | */ | |
901 | int acpi_dev_resume_early(struct device *dev) | |
902 | { | |
79c0373f | 903 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
904 | int error; |
905 | ||
906 | if (!adev) | |
907 | return 0; | |
908 | ||
909 | error = acpi_dev_pm_full_power(adev); | |
f35cec25 | 910 | acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); |
e5cc8ef3 RW |
911 | return error; |
912 | } | |
913 | EXPORT_SYMBOL_GPL(acpi_dev_resume_early); | |
914 | ||
915 | /** | |
916 | * acpi_subsys_prepare - Prepare device for system transition to a sleep state. | |
917 | * @dev: Device to prepare. | |
918 | */ | |
919 | int acpi_subsys_prepare(struct device *dev) | |
920 | { | |
f25c0ae2 RW |
921 | struct acpi_device *adev = ACPI_COMPANION(dev); |
922 | u32 sys_target; | |
923 | int ret, state; | |
924 | ||
925 | ret = pm_generic_prepare(dev); | |
926 | if (ret < 0) | |
927 | return ret; | |
928 | ||
929 | if (!adev || !pm_runtime_suspended(dev) | |
930 | || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) | |
931 | return 0; | |
932 | ||
933 | sys_target = acpi_target_system_state(); | |
934 | if (sys_target == ACPI_STATE_S0) | |
935 | return 1; | |
92858c47 | 936 | |
f25c0ae2 RW |
937 | if (adev->power.flags.dsw_present) |
938 | return 0; | |
939 | ||
940 | ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); | |
941 | return !ret && state == adev->power.state; | |
e5cc8ef3 RW |
942 | } |
943 | EXPORT_SYMBOL_GPL(acpi_subsys_prepare); | |
944 | ||
f25c0ae2 RW |
945 | /** |
946 | * acpi_subsys_complete - Finalize device's resume during system resume. | |
947 | * @dev: Device to handle. | |
948 | */ | |
4cf563c5 | 949 | void acpi_subsys_complete(struct device *dev) |
f25c0ae2 RW |
950 | { |
951 | /* | |
952 | * If the device had been runtime-suspended before the system went into | |
953 | * the sleep state it is going out of and it has never been resumed till | |
954 | * now, resume it in case the firmware powered it up. | |
955 | */ | |
956 | if (dev->power.direct_complete) | |
957 | pm_request_resume(dev); | |
958 | } | |
4cf563c5 | 959 | EXPORT_SYMBOL_GPL(acpi_subsys_complete); |
f25c0ae2 | 960 | |
92858c47 RW |
961 | /** |
962 | * acpi_subsys_suspend - Run the device driver's suspend callback. | |
963 | * @dev: Device to handle. | |
964 | * | |
965 | * Follow PCI and resume devices suspended at run time before running their | |
966 | * system suspend callbacks. | |
967 | */ | |
968 | int acpi_subsys_suspend(struct device *dev) | |
969 | { | |
970 | pm_runtime_resume(dev); | |
971 | return pm_generic_suspend(dev); | |
972 | } | |
4cf563c5 | 973 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend); |
92858c47 | 974 | |
e5cc8ef3 RW |
975 | /** |
976 | * acpi_subsys_suspend_late - Suspend device using ACPI. | |
977 | * @dev: Device to suspend. | |
978 | * | |
979 | * Carry out the generic late suspend procedure for @dev and use ACPI to put | |
980 | * it into a low-power state during system transition into a sleep state. | |
981 | */ | |
982 | int acpi_subsys_suspend_late(struct device *dev) | |
983 | { | |
984 | int ret = pm_generic_suspend_late(dev); | |
985 | return ret ? ret : acpi_dev_suspend_late(dev); | |
986 | } | |
987 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); | |
988 | ||
989 | /** | |
990 | * acpi_subsys_resume_early - Resume device using ACPI. | |
991 | * @dev: Device to Resume. | |
992 | * | |
993 | * Use ACPI to put the given device into the full-power state and carry out the | |
994 | * generic early resume procedure for it during system transition into the | |
995 | * working state. | |
996 | */ | |
997 | int acpi_subsys_resume_early(struct device *dev) | |
998 | { | |
999 | int ret = acpi_dev_resume_early(dev); | |
1000 | return ret ? ret : pm_generic_resume_early(dev); | |
1001 | } | |
1002 | EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); | |
92858c47 RW |
1003 | |
1004 | /** | |
1005 | * acpi_subsys_freeze - Run the device driver's freeze callback. | |
1006 | * @dev: Device to handle. | |
1007 | */ | |
1008 | int acpi_subsys_freeze(struct device *dev) | |
1009 | { | |
1010 | /* | |
1011 | * This used to be done in acpi_subsys_prepare() for all devices and | |
1012 | * some drivers may depend on it, so do it here. Ideally, however, | |
1013 | * runtime-suspended devices should not be touched during freeze/thaw | |
1014 | * transitions. | |
1015 | */ | |
1016 | pm_runtime_resume(dev); | |
1017 | return pm_generic_freeze(dev); | |
1018 | } | |
4cf563c5 | 1019 | EXPORT_SYMBOL_GPL(acpi_subsys_freeze); |
92858c47 | 1020 | |
e5cc8ef3 RW |
1021 | #endif /* CONFIG_PM_SLEEP */ |
1022 | ||
1023 | static struct dev_pm_domain acpi_general_pm_domain = { | |
1024 | .ops = { | |
1025 | #ifdef CONFIG_PM_RUNTIME | |
1026 | .runtime_suspend = acpi_subsys_runtime_suspend, | |
1027 | .runtime_resume = acpi_subsys_runtime_resume, | |
e5cc8ef3 RW |
1028 | #endif |
1029 | #ifdef CONFIG_PM_SLEEP | |
1030 | .prepare = acpi_subsys_prepare, | |
f25c0ae2 | 1031 | .complete = acpi_subsys_complete, |
92858c47 | 1032 | .suspend = acpi_subsys_suspend, |
e5cc8ef3 RW |
1033 | .suspend_late = acpi_subsys_suspend_late, |
1034 | .resume_early = acpi_subsys_resume_early, | |
92858c47 RW |
1035 | .freeze = acpi_subsys_freeze, |
1036 | .poweroff = acpi_subsys_suspend, | |
e5cc8ef3 RW |
1037 | .poweroff_late = acpi_subsys_suspend_late, |
1038 | .restore_early = acpi_subsys_resume_early, | |
1039 | #endif | |
1040 | }, | |
1041 | }; | |
1042 | ||
1043 | /** | |
1044 | * acpi_dev_pm_attach - Prepare device for ACPI power management. | |
1045 | * @dev: Device to prepare. | |
b88ce2a4 | 1046 | * @power_on: Whether or not to power on the device. |
e5cc8ef3 RW |
1047 | * |
1048 | * If @dev has a valid ACPI handle that has a valid struct acpi_device object | |
1049 | * attached to it, install a wakeup notification handler for the device and | |
b88ce2a4 RW |
1050 | * add it to the general ACPI PM domain. If @power_on is set, the device will |
1051 | * be put into the ACPI D0 state before the function returns. | |
e5cc8ef3 RW |
1052 | * |
1053 | * This assumes that the @dev's bus type uses generic power management callbacks | |
1054 | * (or doesn't use any power management callbacks at all). | |
1055 | * | |
1056 | * Callers must ensure proper synchronization of this function with power | |
1057 | * management callbacks. | |
1058 | */ | |
b88ce2a4 | 1059 | int acpi_dev_pm_attach(struct device *dev, bool power_on) |
e5cc8ef3 | 1060 | { |
79c0373f | 1061 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
1062 | |
1063 | if (!adev) | |
1064 | return -ENODEV; | |
1065 | ||
1066 | if (dev->pm_domain) | |
1067 | return -EEXIST; | |
1068 | ||
c072530f | 1069 | acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); |
e5cc8ef3 | 1070 | dev->pm_domain = &acpi_general_pm_domain; |
b88ce2a4 RW |
1071 | if (power_on) { |
1072 | acpi_dev_pm_full_power(adev); | |
f35cec25 | 1073 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
b88ce2a4 | 1074 | } |
86f1e15f UH |
1075 | |
1076 | dev->pm_domain->detach = acpi_dev_pm_detach; | |
e5cc8ef3 RW |
1077 | return 0; |
1078 | } | |
1079 | EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); | |
1080 | ||
1081 | /** | |
1082 | * acpi_dev_pm_detach - Remove ACPI power management from the device. | |
1083 | * @dev: Device to take care of. | |
b88ce2a4 | 1084 | * @power_off: Whether or not to try to remove power from the device. |
e5cc8ef3 RW |
1085 | * |
1086 | * Remove the device from the general ACPI PM domain and remove its wakeup | |
b88ce2a4 RW |
1087 | * notifier. If @power_off is set, additionally remove power from the device if |
1088 | * possible. | |
e5cc8ef3 RW |
1089 | * |
1090 | * Callers must ensure proper synchronization of this function with power | |
1091 | * management callbacks. | |
1092 | */ | |
b88ce2a4 | 1093 | void acpi_dev_pm_detach(struct device *dev, bool power_off) |
e5cc8ef3 | 1094 | { |
79c0373f | 1095 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
1096 | |
1097 | if (adev && dev->pm_domain == &acpi_general_pm_domain) { | |
1098 | dev->pm_domain = NULL; | |
c072530f | 1099 | acpi_remove_pm_notifier(adev); |
b88ce2a4 RW |
1100 | if (power_off) { |
1101 | /* | |
1102 | * If the device's PM QoS resume latency limit or flags | |
1103 | * have been exposed to user space, they have to be | |
1104 | * hidden at this point, so that they don't affect the | |
1105 | * choice of the low-power state to put the device into. | |
1106 | */ | |
1107 | dev_pm_qos_hide_latency_limit(dev); | |
1108 | dev_pm_qos_hide_flags(dev); | |
f35cec25 | 1109 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
b88ce2a4 RW |
1110 | acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); |
1111 | } | |
e5cc8ef3 RW |
1112 | } |
1113 | } | |
1114 | EXPORT_SYMBOL_GPL(acpi_dev_pm_detach); | |
ec4602a9 | 1115 | #endif /* CONFIG_PM */ |