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 | * | |
ec2cd81c RW |
18 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
19 | */ | |
20 | ||
7b199811 | 21 | #include <linux/acpi.h> |
86b3832c | 22 | #include <linux/export.h> |
ec2cd81c | 23 | #include <linux/mutex.h> |
86b3832c | 24 | #include <linux/pm_qos.h> |
989561de | 25 | #include <linux/pm_domain.h> |
cd7bd02d | 26 | #include <linux/pm_runtime.h> |
ec2cd81c | 27 | |
9ce4e607 RW |
28 | #include "internal.h" |
29 | ||
30 | #define _COMPONENT ACPI_POWER_COMPONENT | |
31 | ACPI_MODULE_NAME("device_pm"); | |
ec2cd81c | 32 | |
9ce4e607 RW |
33 | /** |
34 | * acpi_power_state_string - String representation of ACPI device power state. | |
35 | * @state: ACPI device power state to return the string representation of. | |
36 | */ | |
37 | const char *acpi_power_state_string(int state) | |
38 | { | |
39 | switch (state) { | |
40 | case ACPI_STATE_D0: | |
41 | return "D0"; | |
42 | case ACPI_STATE_D1: | |
43 | return "D1"; | |
44 | case ACPI_STATE_D2: | |
45 | return "D2"; | |
46 | case ACPI_STATE_D3_HOT: | |
47 | return "D3hot"; | |
48 | case ACPI_STATE_D3_COLD: | |
898fee4f | 49 | return "D3cold"; |
9ce4e607 RW |
50 | default: |
51 | return "(unknown)"; | |
52 | } | |
53 | } | |
54 | ||
55 | /** | |
56 | * acpi_device_get_power - Get power state of an ACPI device. | |
57 | * @device: Device to get the power state of. | |
58 | * @state: Place to store the power state of the device. | |
59 | * | |
60 | * This function does not update the device's power.state field, but it may | |
61 | * update its parent's power.state field (when the parent's power state is | |
62 | * unknown and the device's power state turns out to be D0). | |
63 | */ | |
64 | int acpi_device_get_power(struct acpi_device *device, int *state) | |
65 | { | |
66 | int result = ACPI_STATE_UNKNOWN; | |
67 | ||
68 | if (!device || !state) | |
69 | return -EINVAL; | |
70 | ||
71 | if (!device->flags.power_manageable) { | |
72 | /* TBD: Non-recursive algorithm for walking up hierarchy. */ | |
73 | *state = device->parent ? | |
74 | device->parent->power.state : ACPI_STATE_D0; | |
75 | goto out; | |
76 | } | |
77 | ||
78 | /* | |
75eb2d13 RW |
79 | * Get the device's power state from power resources settings and _PSC, |
80 | * if available. | |
9ce4e607 | 81 | */ |
75eb2d13 RW |
82 | if (device->power.flags.power_resources) { |
83 | int error = acpi_power_get_inferred_state(device, &result); | |
84 | if (error) | |
85 | return error; | |
86 | } | |
9ce4e607 | 87 | if (device->power.flags.explicit_get) { |
75eb2d13 | 88 | acpi_handle handle = device->handle; |
9ce4e607 | 89 | unsigned long long psc; |
75eb2d13 RW |
90 | acpi_status status; |
91 | ||
92 | status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc); | |
9ce4e607 RW |
93 | if (ACPI_FAILURE(status)) |
94 | return -ENODEV; | |
95 | ||
75eb2d13 RW |
96 | /* |
97 | * The power resources settings may indicate a power state | |
20dacb71 RW |
98 | * shallower than the actual power state of the device, because |
99 | * the same power resources may be referenced by other devices. | |
75eb2d13 | 100 | * |
20dacb71 RW |
101 | * For systems predating ACPI 4.0 we assume that D3hot is the |
102 | * deepest state that can be supported. | |
75eb2d13 RW |
103 | */ |
104 | if (psc > result && psc < ACPI_STATE_D3_COLD) | |
105 | result = psc; | |
106 | else if (result == ACPI_STATE_UNKNOWN) | |
20dacb71 | 107 | result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc; |
9ce4e607 RW |
108 | } |
109 | ||
110 | /* | |
111 | * If we were unsure about the device parent's power state up to this | |
112 | * point, the fact that the device is in D0 implies that the parent has | |
644f17ad | 113 | * to be in D0 too, except if ignore_parent is set. |
9ce4e607 | 114 | */ |
644f17ad MW |
115 | if (!device->power.flags.ignore_parent && device->parent |
116 | && device->parent->power.state == ACPI_STATE_UNKNOWN | |
9ce4e607 RW |
117 | && result == ACPI_STATE_D0) |
118 | device->parent->power.state = ACPI_STATE_D0; | |
119 | ||
120 | *state = result; | |
121 | ||
122 | out: | |
123 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", | |
124 | device->pnp.bus_id, acpi_power_state_string(*state))); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
9c0f45e3 RW |
129 | static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
130 | { | |
131 | if (adev->power.states[state].flags.explicit_set) { | |
132 | char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; | |
133 | acpi_status status; | |
134 | ||
135 | status = acpi_evaluate_object(adev->handle, method, NULL, NULL); | |
136 | if (ACPI_FAILURE(status)) | |
137 | return -ENODEV; | |
138 | } | |
139 | return 0; | |
140 | } | |
141 | ||
9ce4e607 RW |
142 | /** |
143 | * acpi_device_set_power - Set power state of an ACPI device. | |
144 | * @device: Device to set the power state of. | |
145 | * @state: New power state to set. | |
146 | * | |
147 | * Callers must ensure that the device is power manageable before using this | |
148 | * function. | |
149 | */ | |
150 | int acpi_device_set_power(struct acpi_device *device, int state) | |
151 | { | |
20dacb71 | 152 | int target_state = state; |
9ce4e607 | 153 | int result = 0; |
9ce4e607 | 154 | |
2c7d132a RW |
155 | if (!device || !device->flags.power_manageable |
156 | || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) | |
9ce4e607 RW |
157 | return -EINVAL; |
158 | ||
159 | /* Make sure this is a valid target state */ | |
160 | ||
161 | if (state == device->power.state) { | |
b69137a7 RW |
162 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", |
163 | device->pnp.bus_id, | |
9ce4e607 RW |
164 | acpi_power_state_string(state))); |
165 | return 0; | |
166 | } | |
167 | ||
20dacb71 RW |
168 | if (state == ACPI_STATE_D3_COLD) { |
169 | /* | |
170 | * For transitions to D3cold we need to execute _PS3 and then | |
171 | * possibly drop references to the power resources in use. | |
172 | */ | |
173 | state = ACPI_STATE_D3_HOT; | |
174 | /* If _PR3 is not available, use D3hot as the target state. */ | |
175 | if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) | |
176 | target_state = state; | |
177 | } else if (!device->power.states[state].flags.valid) { | |
b69137a7 RW |
178 | dev_warn(&device->dev, "Power state %s not supported\n", |
179 | acpi_power_state_string(state)); | |
9ce4e607 RW |
180 | return -ENODEV; |
181 | } | |
20dacb71 | 182 | |
644f17ad MW |
183 | if (!device->power.flags.ignore_parent && |
184 | device->parent && (state < device->parent->power.state)) { | |
b69137a7 | 185 | dev_warn(&device->dev, |
593298e6 AL |
186 | "Cannot transition to power state %s for parent in %s\n", |
187 | acpi_power_state_string(state), | |
188 | acpi_power_state_string(device->parent->power.state)); | |
9ce4e607 RW |
189 | return -ENODEV; |
190 | } | |
191 | ||
9ce4e607 RW |
192 | /* |
193 | * Transition Power | |
194 | * ---------------- | |
20dacb71 RW |
195 | * In accordance with ACPI 6, _PSx is executed before manipulating power |
196 | * resources, unless the target state is D0, in which case _PS0 is | |
197 | * supposed to be executed after turning the power resources on. | |
9ce4e607 | 198 | */ |
20dacb71 RW |
199 | if (state > ACPI_STATE_D0) { |
200 | /* | |
201 | * According to ACPI 6, devices cannot go from lower-power | |
202 | * (deeper) states to higher-power (shallower) states. | |
203 | */ | |
204 | if (state < device->power.state) { | |
205 | dev_warn(&device->dev, "Cannot transition from %s to %s\n", | |
206 | acpi_power_state_string(device->power.state), | |
207 | acpi_power_state_string(state)); | |
208 | return -ENODEV; | |
209 | } | |
210 | ||
211 | result = acpi_dev_pm_explicit_set(device, state); | |
9c0f45e3 RW |
212 | if (result) |
213 | goto end; | |
9ce4e607 | 214 | |
20dacb71 RW |
215 | if (device->power.flags.power_resources) |
216 | result = acpi_power_transition(device, target_state); | |
217 | } else { | |
218 | if (device->power.flags.power_resources) { | |
219 | result = acpi_power_transition(device, ACPI_STATE_D0); | |
220 | if (result) | |
221 | goto end; | |
222 | } | |
223 | result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
e5656271 | 224 | } |
9ce4e607 | 225 | |
e78adb75 RW |
226 | end: |
227 | if (result) { | |
b69137a7 RW |
228 | dev_warn(&device->dev, "Failed to change power state to %s\n", |
229 | acpi_power_state_string(state)); | |
e78adb75 | 230 | } else { |
71b65445 | 231 | device->power.state = target_state; |
9ce4e607 RW |
232 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
233 | "Device [%s] transitioned to %s\n", | |
234 | device->pnp.bus_id, | |
235 | acpi_power_state_string(state))); | |
236 | } | |
237 | ||
238 | return result; | |
239 | } | |
240 | EXPORT_SYMBOL(acpi_device_set_power); | |
241 | ||
242 | int acpi_bus_set_power(acpi_handle handle, int state) | |
243 | { | |
244 | struct acpi_device *device; | |
245 | int result; | |
246 | ||
247 | result = acpi_bus_get_device(handle, &device); | |
248 | if (result) | |
249 | return result; | |
250 | ||
9ce4e607 RW |
251 | return acpi_device_set_power(device, state); |
252 | } | |
253 | EXPORT_SYMBOL(acpi_bus_set_power); | |
254 | ||
255 | int acpi_bus_init_power(struct acpi_device *device) | |
256 | { | |
257 | int state; | |
258 | int result; | |
259 | ||
260 | if (!device) | |
261 | return -EINVAL; | |
262 | ||
263 | device->power.state = ACPI_STATE_UNKNOWN; | |
202317a5 | 264 | if (!acpi_device_is_present(device)) |
1b1f3e16 | 265 | return -ENXIO; |
9ce4e607 RW |
266 | |
267 | result = acpi_device_get_power(device, &state); | |
268 | if (result) | |
269 | return result; | |
270 | ||
a2367807 | 271 | if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { |
20dacb71 | 272 | /* Reference count the power resources. */ |
9ce4e607 | 273 | result = acpi_power_on_resources(device, state); |
a2367807 RW |
274 | if (result) |
275 | return result; | |
9ce4e607 | 276 | |
20dacb71 RW |
277 | if (state == ACPI_STATE_D0) { |
278 | /* | |
279 | * If _PSC is not present and the state inferred from | |
280 | * power resources appears to be D0, it still may be | |
281 | * necessary to execute _PS0 at this point, because | |
282 | * another device using the same power resources may | |
283 | * have been put into D0 previously and that's why we | |
284 | * see D0 here. | |
285 | */ | |
286 | result = acpi_dev_pm_explicit_set(device, state); | |
287 | if (result) | |
288 | return result; | |
289 | } | |
b3785492 | 290 | } else if (state == ACPI_STATE_UNKNOWN) { |
7cd8407d RW |
291 | /* |
292 | * No power resources and missing _PSC? Cross fingers and make | |
293 | * it D0 in hope that this is what the BIOS put the device into. | |
294 | * [We tried to force D0 here by executing _PS0, but that broke | |
295 | * Toshiba P870-303 in a nasty way.] | |
296 | */ | |
b3785492 | 297 | state = ACPI_STATE_D0; |
a2367807 RW |
298 | } |
299 | device->power.state = state; | |
300 | return 0; | |
9ce4e607 RW |
301 | } |
302 | ||
b9e95fc6 RW |
303 | /** |
304 | * acpi_device_fix_up_power - Force device with missing _PSC into D0. | |
305 | * @device: Device object whose power state is to be fixed up. | |
306 | * | |
307 | * Devices without power resources and _PSC, but having _PS0 and _PS3 defined, | |
308 | * are assumed to be put into D0 by the BIOS. However, in some cases that may | |
309 | * not be the case and this function should be used then. | |
310 | */ | |
311 | int acpi_device_fix_up_power(struct acpi_device *device) | |
312 | { | |
313 | int ret = 0; | |
314 | ||
315 | if (!device->power.flags.power_resources | |
316 | && !device->power.flags.explicit_get | |
317 | && device->power.state == ACPI_STATE_D0) | |
318 | ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
319 | ||
320 | return ret; | |
321 | } | |
322 | ||
202317a5 | 323 | int acpi_device_update_power(struct acpi_device *device, int *state_p) |
9ce4e607 | 324 | { |
9ce4e607 RW |
325 | int state; |
326 | int result; | |
327 | ||
202317a5 RW |
328 | if (device->power.state == ACPI_STATE_UNKNOWN) { |
329 | result = acpi_bus_init_power(device); | |
330 | if (!result && state_p) | |
331 | *state_p = device->power.state; | |
332 | ||
9ce4e607 | 333 | return result; |
202317a5 | 334 | } |
9ce4e607 RW |
335 | |
336 | result = acpi_device_get_power(device, &state); | |
337 | if (result) | |
338 | return result; | |
339 | ||
91bdad0b | 340 | if (state == ACPI_STATE_UNKNOWN) { |
511d5c42 | 341 | state = ACPI_STATE_D0; |
91bdad0b RW |
342 | result = acpi_device_set_power(device, state); |
343 | if (result) | |
344 | return result; | |
345 | } else { | |
346 | if (device->power.flags.power_resources) { | |
347 | /* | |
348 | * We don't need to really switch the state, bu we need | |
349 | * to update the power resources' reference counters. | |
350 | */ | |
351 | result = acpi_power_transition(device, state); | |
352 | if (result) | |
353 | return result; | |
354 | } | |
355 | device->power.state = state; | |
356 | } | |
357 | if (state_p) | |
9ce4e607 RW |
358 | *state_p = state; |
359 | ||
91bdad0b | 360 | return 0; |
9ce4e607 | 361 | } |
2bb3a2bf | 362 | EXPORT_SYMBOL_GPL(acpi_device_update_power); |
202317a5 RW |
363 | |
364 | int acpi_bus_update_power(acpi_handle handle, int *state_p) | |
365 | { | |
366 | struct acpi_device *device; | |
367 | int result; | |
368 | ||
369 | result = acpi_bus_get_device(handle, &device); | |
370 | return result ? result : acpi_device_update_power(device, state_p); | |
371 | } | |
9ce4e607 RW |
372 | EXPORT_SYMBOL_GPL(acpi_bus_update_power); |
373 | ||
374 | bool acpi_bus_power_manageable(acpi_handle handle) | |
375 | { | |
376 | struct acpi_device *device; | |
377 | int result; | |
378 | ||
379 | result = acpi_bus_get_device(handle, &device); | |
380 | return result ? false : device->flags.power_manageable; | |
381 | } | |
382 | EXPORT_SYMBOL(acpi_bus_power_manageable); | |
383 | ||
ec4602a9 RW |
384 | #ifdef CONFIG_PM |
385 | static DEFINE_MUTEX(acpi_pm_notifier_lock); | |
386 | ||
c072530f RW |
387 | static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) |
388 | { | |
389 | struct acpi_device *adev; | |
390 | ||
391 | if (val != ACPI_NOTIFY_DEVICE_WAKE) | |
392 | return; | |
393 | ||
394 | adev = acpi_bus_get_acpi_device(handle); | |
395 | if (!adev) | |
396 | return; | |
397 | ||
398 | mutex_lock(&acpi_pm_notifier_lock); | |
399 | ||
400 | if (adev->wakeup.flags.notifier_present) { | |
401 | __pm_wakeup_event(adev->wakeup.ws, 0); | |
402 | if (adev->wakeup.context.work.func) | |
403 | queue_pm_work(&adev->wakeup.context.work); | |
404 | } | |
405 | ||
406 | mutex_unlock(&acpi_pm_notifier_lock); | |
407 | ||
408 | acpi_bus_put_acpi_device(adev); | |
409 | } | |
410 | ||
ec4602a9 | 411 | /** |
c072530f RW |
412 | * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. |
413 | * @adev: ACPI device to add the notify handler for. | |
414 | * @dev: Device to generate a wakeup event for while handling the notification. | |
415 | * @work_func: Work function to execute when handling the notification. | |
ec4602a9 RW |
416 | * |
417 | * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of | |
418 | * PM wakeup events. For example, wakeup events may be generated for bridges | |
419 | * if one of the devices below the bridge is signaling wakeup, even if the | |
420 | * bridge itself doesn't have a wakeup GPE associated with it. | |
421 | */ | |
c072530f RW |
422 | acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, |
423 | void (*work_func)(struct work_struct *work)) | |
ec4602a9 RW |
424 | { |
425 | acpi_status status = AE_ALREADY_EXISTS; | |
426 | ||
c072530f RW |
427 | if (!dev && !work_func) |
428 | return AE_BAD_PARAMETER; | |
429 | ||
ec4602a9 RW |
430 | mutex_lock(&acpi_pm_notifier_lock); |
431 | ||
432 | if (adev->wakeup.flags.notifier_present) | |
433 | goto out; | |
434 | ||
c072530f RW |
435 | adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev)); |
436 | adev->wakeup.context.dev = dev; | |
437 | if (work_func) | |
438 | INIT_WORK(&adev->wakeup.context.work, work_func); | |
439 | ||
440 | status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, | |
441 | acpi_pm_notify_handler, NULL); | |
ec4602a9 RW |
442 | if (ACPI_FAILURE(status)) |
443 | goto out; | |
444 | ||
445 | adev->wakeup.flags.notifier_present = true; | |
446 | ||
447 | out: | |
448 | mutex_unlock(&acpi_pm_notifier_lock); | |
449 | return status; | |
450 | } | |
451 | ||
452 | /** | |
453 | * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
454 | * @adev: ACPI device to remove the notifier from. | |
455 | */ | |
c072530f | 456 | acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) |
ec4602a9 RW |
457 | { |
458 | acpi_status status = AE_BAD_PARAMETER; | |
459 | ||
460 | mutex_lock(&acpi_pm_notifier_lock); | |
461 | ||
462 | if (!adev->wakeup.flags.notifier_present) | |
463 | goto out; | |
464 | ||
465 | status = acpi_remove_notify_handler(adev->handle, | |
466 | ACPI_SYSTEM_NOTIFY, | |
c072530f | 467 | acpi_pm_notify_handler); |
ec4602a9 RW |
468 | if (ACPI_FAILURE(status)) |
469 | goto out; | |
470 | ||
c072530f RW |
471 | if (adev->wakeup.context.work.func) { |
472 | cancel_work_sync(&adev->wakeup.context.work); | |
473 | adev->wakeup.context.work.func = NULL; | |
474 | } | |
475 | adev->wakeup.context.dev = NULL; | |
476 | wakeup_source_unregister(adev->wakeup.ws); | |
477 | ||
ec4602a9 RW |
478 | adev->wakeup.flags.notifier_present = false; |
479 | ||
480 | out: | |
481 | mutex_unlock(&acpi_pm_notifier_lock); | |
482 | return status; | |
483 | } | |
484 | ||
9ce4e607 RW |
485 | bool acpi_bus_can_wakeup(acpi_handle handle) |
486 | { | |
487 | struct acpi_device *device; | |
488 | int result; | |
489 | ||
490 | result = acpi_bus_get_device(handle, &device); | |
491 | return result ? false : device->wakeup.flags.valid; | |
492 | } | |
493 | EXPORT_SYMBOL(acpi_bus_can_wakeup); | |
494 | ||
86b3832c | 495 | /** |
b25c77ef | 496 | * acpi_dev_pm_get_state - Get preferred power state of ACPI device. |
86b3832c RW |
497 | * @dev: Device whose preferred target power state to return. |
498 | * @adev: ACPI device node corresponding to @dev. | |
499 | * @target_state: System state to match the resultant device state. | |
fa1675b5 RW |
500 | * @d_min_p: Location to store the highest power state available to the device. |
501 | * @d_max_p: Location to store the lowest power state available to the device. | |
86b3832c | 502 | * |
fa1675b5 RW |
503 | * Find the lowest power (highest number) and highest power (lowest number) ACPI |
504 | * device power states that the device can be in while the system is in the | |
505 | * state represented by @target_state. Store the integer numbers representing | |
506 | * those stats in the memory locations pointed to by @d_max_p and @d_min_p, | |
507 | * respectively. | |
86b3832c RW |
508 | * |
509 | * Callers must ensure that @dev and @adev are valid pointers and that @adev | |
510 | * actually corresponds to @dev before using this function. | |
fa1675b5 RW |
511 | * |
512 | * Returns 0 on success or -ENODATA when one of the ACPI methods fails or | |
513 | * returns a value that doesn't make sense. The memory locations pointed to by | |
514 | * @d_max_p and @d_min_p are only modified on success. | |
86b3832c | 515 | */ |
b25c77ef | 516 | static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, |
fa1675b5 | 517 | u32 target_state, int *d_min_p, int *d_max_p) |
86b3832c | 518 | { |
fa1675b5 RW |
519 | char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; |
520 | acpi_handle handle = adev->handle; | |
521 | unsigned long long ret; | |
522 | int d_min, d_max; | |
86b3832c | 523 | bool wakeup = false; |
fa1675b5 | 524 | acpi_status status; |
86b3832c | 525 | |
86b3832c | 526 | /* |
fa1675b5 RW |
527 | * If the system state is S0, the lowest power state the device can be |
528 | * in is D3cold, unless the device has _S0W and is supposed to signal | |
529 | * wakeup, in which case the return value of _S0W has to be used as the | |
530 | * lowest power state available to the device. | |
86b3832c RW |
531 | */ |
532 | d_min = ACPI_STATE_D0; | |
4c164ae7 | 533 | d_max = ACPI_STATE_D3_COLD; |
86b3832c RW |
534 | |
535 | /* | |
536 | * If present, _SxD methods return the minimum D-state (highest power | |
537 | * state) we can use for the corresponding S-states. Otherwise, the | |
538 | * minimum D-state is D0 (ACPI 3.x). | |
86b3832c RW |
539 | */ |
540 | if (target_state > ACPI_STATE_S0) { | |
fa1675b5 RW |
541 | /* |
542 | * We rely on acpi_evaluate_integer() not clobbering the integer | |
543 | * provided if AE_NOT_FOUND is returned. | |
544 | */ | |
545 | ret = d_min; | |
546 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
547 | if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) | |
548 | || ret > ACPI_STATE_D3_COLD) | |
549 | return -ENODATA; | |
550 | ||
551 | /* | |
552 | * We need to handle legacy systems where D3hot and D3cold are | |
553 | * the same and 3 is returned in both cases, so fall back to | |
554 | * D3cold if D3hot is not a valid state. | |
555 | */ | |
556 | if (!adev->power.states[ret].flags.valid) { | |
557 | if (ret == ACPI_STATE_D3_HOT) | |
558 | ret = ACPI_STATE_D3_COLD; | |
559 | else | |
560 | return -ENODATA; | |
561 | } | |
562 | d_min = ret; | |
86b3832c RW |
563 | wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid |
564 | && adev->wakeup.sleep_state >= target_state; | |
565 | } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != | |
566 | PM_QOS_FLAGS_NONE) { | |
567 | wakeup = adev->wakeup.flags.valid; | |
568 | } | |
569 | ||
570 | /* | |
571 | * If _PRW says we can wake up the system from the target sleep state, | |
572 | * the D-state returned by _SxD is sufficient for that (we assume a | |
573 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
574 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
575 | * can wake the system. _S0W may be valid, too. | |
576 | */ | |
577 | if (wakeup) { | |
fa1675b5 RW |
578 | method[3] = 'W'; |
579 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
580 | if (status == AE_NOT_FOUND) { | |
581 | if (target_state > ACPI_STATE_S0) | |
86b3832c | 582 | d_max = d_min; |
fa1675b5 RW |
583 | } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { |
584 | /* Fall back to D3cold if ret is not a valid state. */ | |
585 | if (!adev->power.states[ret].flags.valid) | |
586 | ret = ACPI_STATE_D3_COLD; | |
587 | ||
588 | d_max = ret > d_min ? ret : d_min; | |
589 | } else { | |
590 | return -ENODATA; | |
86b3832c RW |
591 | } |
592 | } | |
593 | ||
86b3832c RW |
594 | if (d_min_p) |
595 | *d_min_p = d_min; | |
fa1675b5 RW |
596 | |
597 | if (d_max_p) | |
598 | *d_max_p = d_max; | |
599 | ||
600 | return 0; | |
86b3832c | 601 | } |
cd7bd02d | 602 | |
a6ae7594 RW |
603 | /** |
604 | * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. | |
605 | * @dev: Device whose preferred target power state to return. | |
606 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
607 | * @d_max_in: Deepest low-power state to take into consideration. | |
608 | * Return value: Preferred power state of the device on success, -ENODEV | |
fa1675b5 RW |
609 | * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is |
610 | * incorrect, or -ENODATA on ACPI method failure. | |
a6ae7594 RW |
611 | * |
612 | * The caller must ensure that @dev is valid before using this function. | |
613 | */ | |
614 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) | |
615 | { | |
a6ae7594 | 616 | struct acpi_device *adev; |
9b5c7a5a | 617 | int ret, d_min, d_max; |
fa1675b5 RW |
618 | |
619 | if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) | |
620 | return -EINVAL; | |
621 | ||
20dacb71 | 622 | if (d_max_in > ACPI_STATE_D2) { |
fa1675b5 RW |
623 | enum pm_qos_flags_status stat; |
624 | ||
625 | stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); | |
626 | if (stat == PM_QOS_FLAGS_ALL) | |
20dacb71 | 627 | d_max_in = ACPI_STATE_D2; |
fa1675b5 | 628 | } |
a6ae7594 | 629 | |
17653a3e RW |
630 | adev = ACPI_COMPANION(dev); |
631 | if (!adev) { | |
632 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
633 | return -ENODEV; |
634 | } | |
635 | ||
fa1675b5 | 636 | ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), |
9b5c7a5a | 637 | &d_min, &d_max); |
fa1675b5 RW |
638 | if (ret) |
639 | return ret; | |
640 | ||
9b5c7a5a | 641 | if (d_max_in < d_min) |
fa1675b5 RW |
642 | return -EINVAL; |
643 | ||
644 | if (d_max > d_max_in) { | |
9b5c7a5a | 645 | for (d_max = d_max_in; d_max > d_min; d_max--) { |
fa1675b5 RW |
646 | if (adev->power.states[d_max].flags.valid) |
647 | break; | |
648 | } | |
649 | } | |
9b5c7a5a RW |
650 | |
651 | if (d_min_p) | |
652 | *d_min_p = d_min; | |
653 | ||
fa1675b5 | 654 | return d_max; |
a6ae7594 RW |
655 | } |
656 | EXPORT_SYMBOL(acpi_pm_device_sleep_state); | |
657 | ||
e5cc8ef3 | 658 | /** |
c072530f RW |
659 | * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. |
660 | * @work: Work item to handle. | |
e5cc8ef3 | 661 | */ |
c072530f | 662 | static void acpi_pm_notify_work_func(struct work_struct *work) |
e5cc8ef3 | 663 | { |
c072530f | 664 | struct device *dev; |
e5cc8ef3 | 665 | |
c072530f RW |
666 | dev = container_of(work, struct acpi_device_wakeup_context, work)->dev; |
667 | if (dev) { | |
e5cc8ef3 RW |
668 | pm_wakeup_event(dev, 0); |
669 | pm_runtime_resume(dev); | |
670 | } | |
671 | } | |
672 | ||
cd7bd02d | 673 | /** |
f35cec25 RW |
674 | * acpi_device_wakeup - Enable/disable wakeup functionality for device. |
675 | * @adev: ACPI device to enable/disable wakeup functionality for. | |
676 | * @target_state: State the system is transitioning into. | |
cd7bd02d RW |
677 | * @enable: Whether to enable or disable the wakeup functionality. |
678 | * | |
dee8370c RW |
679 | * Enable/disable the GPE associated with @adev so that it can generate |
680 | * wakeup signals for the device in response to external (remote) events and | |
681 | * enable/disable device wakeup power. | |
682 | * | |
683 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
684 | * this function. | |
685 | */ | |
f35cec25 RW |
686 | static int acpi_device_wakeup(struct acpi_device *adev, u32 target_state, |
687 | bool enable) | |
dee8370c RW |
688 | { |
689 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
690 | ||
691 | if (enable) { | |
692 | acpi_status res; | |
693 | int error; | |
694 | ||
f35cec25 | 695 | error = acpi_enable_wakeup_device_power(adev, target_state); |
dee8370c RW |
696 | if (error) |
697 | return error; | |
698 | ||
175f8e26 RW |
699 | if (adev->wakeup.flags.enabled) |
700 | return 0; | |
701 | ||
dee8370c | 702 | res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
175f8e26 RW |
703 | if (ACPI_SUCCESS(res)) { |
704 | adev->wakeup.flags.enabled = 1; | |
705 | } else { | |
dee8370c RW |
706 | acpi_disable_wakeup_device_power(adev); |
707 | return -EIO; | |
708 | } | |
709 | } else { | |
175f8e26 RW |
710 | if (adev->wakeup.flags.enabled) { |
711 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
712 | adev->wakeup.flags.enabled = 0; | |
713 | } | |
dee8370c RW |
714 | acpi_disable_wakeup_device_power(adev); |
715 | } | |
716 | return 0; | |
717 | } | |
718 | ||
719 | /** | |
720 | * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. | |
721 | * @dev: Device to enable/disable the platform to wake up. | |
722 | * @enable: Whether to enable or disable the wakeup functionality. | |
cd7bd02d RW |
723 | */ |
724 | int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) | |
725 | { | |
dee8370c | 726 | struct acpi_device *adev; |
cd7bd02d RW |
727 | |
728 | if (!device_run_wake(phys_dev)) | |
729 | return -EINVAL; | |
730 | ||
17653a3e RW |
731 | adev = ACPI_COMPANION(phys_dev); |
732 | if (!adev) { | |
733 | dev_dbg(phys_dev, "ACPI companion missing in %s!\n", __func__); | |
cd7bd02d RW |
734 | return -ENODEV; |
735 | } | |
736 | ||
67598a1d | 737 | return acpi_device_wakeup(adev, ACPI_STATE_S0, enable); |
cd7bd02d RW |
738 | } |
739 | EXPORT_SYMBOL(acpi_pm_device_run_wake); | |
dee8370c | 740 | |
4d56410b | 741 | #ifdef CONFIG_PM_SLEEP |
a6ae7594 RW |
742 | /** |
743 | * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system. | |
744 | * @dev: Device to enable/desible to wake up the system from sleep states. | |
745 | * @enable: Whether to enable or disable @dev to wake up the system. | |
746 | */ | |
747 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
748 | { | |
a6ae7594 RW |
749 | struct acpi_device *adev; |
750 | int error; | |
751 | ||
752 | if (!device_can_wakeup(dev)) | |
753 | return -EINVAL; | |
754 | ||
17653a3e RW |
755 | adev = ACPI_COMPANION(dev); |
756 | if (!adev) { | |
757 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
758 | return -ENODEV; |
759 | } | |
760 | ||
f35cec25 | 761 | error = acpi_device_wakeup(adev, acpi_target_system_state(), enable); |
a6ae7594 RW |
762 | if (!error) |
763 | dev_info(dev, "System wakeup %s by ACPI\n", | |
764 | enable ? "enabled" : "disabled"); | |
765 | ||
766 | return error; | |
767 | } | |
dee8370c | 768 | #endif /* CONFIG_PM_SLEEP */ |
e5cc8ef3 | 769 | |
e5cc8ef3 RW |
770 | /** |
771 | * acpi_dev_pm_low_power - Put ACPI device into a low-power state. | |
772 | * @dev: Device to put into a low-power state. | |
773 | * @adev: ACPI device node corresponding to @dev. | |
774 | * @system_state: System state to choose the device state for. | |
775 | */ | |
776 | static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, | |
777 | u32 system_state) | |
778 | { | |
fa1675b5 | 779 | int ret, state; |
e5cc8ef3 RW |
780 | |
781 | if (!acpi_device_power_manageable(adev)) | |
782 | return 0; | |
783 | ||
fa1675b5 RW |
784 | ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); |
785 | return ret ? ret : acpi_device_set_power(adev, state); | |
e5cc8ef3 RW |
786 | } |
787 | ||
788 | /** | |
789 | * acpi_dev_pm_full_power - Put ACPI device into the full-power state. | |
790 | * @adev: ACPI device node to put into the full-power state. | |
791 | */ | |
792 | static int acpi_dev_pm_full_power(struct acpi_device *adev) | |
793 | { | |
794 | return acpi_device_power_manageable(adev) ? | |
795 | acpi_device_set_power(adev, ACPI_STATE_D0) : 0; | |
796 | } | |
797 | ||
e5cc8ef3 RW |
798 | /** |
799 | * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. | |
800 | * @dev: Device to put into a low-power state. | |
801 | * | |
802 | * Put the given device into a runtime low-power state using the standard ACPI | |
803 | * mechanism. Set up remote wakeup if desired, choose the state to put the | |
804 | * device into (this checks if remote wakeup is expected to work too), and set | |
805 | * the power state of the device. | |
806 | */ | |
807 | int acpi_dev_runtime_suspend(struct device *dev) | |
808 | { | |
79c0373f | 809 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
810 | bool remote_wakeup; |
811 | int error; | |
812 | ||
813 | if (!adev) | |
814 | return 0; | |
815 | ||
816 | remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > | |
817 | PM_QOS_FLAGS_NONE; | |
f35cec25 | 818 | error = acpi_device_wakeup(adev, ACPI_STATE_S0, remote_wakeup); |
e5cc8ef3 RW |
819 | if (remote_wakeup && error) |
820 | return -EAGAIN; | |
821 | ||
822 | error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
823 | if (error) | |
f35cec25 | 824 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
e5cc8ef3 RW |
825 | |
826 | return error; | |
827 | } | |
828 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); | |
829 | ||
830 | /** | |
831 | * acpi_dev_runtime_resume - Put device into the full-power state using ACPI. | |
832 | * @dev: Device to put into the full-power state. | |
833 | * | |
834 | * Put the given device into the full-power state using the standard ACPI | |
835 | * mechanism at run time. Set the power state of the device to ACPI D0 and | |
836 | * disable remote wakeup. | |
837 | */ | |
838 | int acpi_dev_runtime_resume(struct device *dev) | |
839 | { | |
79c0373f | 840 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
841 | int error; |
842 | ||
843 | if (!adev) | |
844 | return 0; | |
845 | ||
846 | error = acpi_dev_pm_full_power(adev); | |
f35cec25 | 847 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
e5cc8ef3 RW |
848 | return error; |
849 | } | |
850 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); | |
851 | ||
852 | /** | |
853 | * acpi_subsys_runtime_suspend - Suspend device using ACPI. | |
854 | * @dev: Device to suspend. | |
855 | * | |
856 | * Carry out the generic runtime suspend procedure for @dev and use ACPI to put | |
857 | * it into a runtime low-power state. | |
858 | */ | |
859 | int acpi_subsys_runtime_suspend(struct device *dev) | |
860 | { | |
861 | int ret = pm_generic_runtime_suspend(dev); | |
862 | return ret ? ret : acpi_dev_runtime_suspend(dev); | |
863 | } | |
864 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); | |
865 | ||
866 | /** | |
867 | * acpi_subsys_runtime_resume - Resume device using ACPI. | |
868 | * @dev: Device to Resume. | |
869 | * | |
870 | * Use ACPI to put the given device into the full-power state and carry out the | |
871 | * generic runtime resume procedure for it. | |
872 | */ | |
873 | int acpi_subsys_runtime_resume(struct device *dev) | |
874 | { | |
875 | int ret = acpi_dev_runtime_resume(dev); | |
876 | return ret ? ret : pm_generic_runtime_resume(dev); | |
877 | } | |
878 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); | |
e5cc8ef3 RW |
879 | |
880 | #ifdef CONFIG_PM_SLEEP | |
881 | /** | |
882 | * acpi_dev_suspend_late - Put device into a low-power state using ACPI. | |
883 | * @dev: Device to put into a low-power state. | |
884 | * | |
885 | * Put the given device into a low-power state during system transition to a | |
886 | * sleep state using the standard ACPI mechanism. Set up system wakeup if | |
887 | * desired, choose the state to put the device into (this checks if system | |
888 | * wakeup is expected to work too), and set the power state of the device. | |
889 | */ | |
890 | int acpi_dev_suspend_late(struct device *dev) | |
891 | { | |
79c0373f | 892 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
893 | u32 target_state; |
894 | bool wakeup; | |
895 | int error; | |
896 | ||
897 | if (!adev) | |
898 | return 0; | |
899 | ||
900 | target_state = acpi_target_system_state(); | |
78579b7c | 901 | wakeup = device_may_wakeup(dev) && acpi_device_can_wakeup(adev); |
f35cec25 | 902 | error = acpi_device_wakeup(adev, target_state, wakeup); |
e5cc8ef3 RW |
903 | if (wakeup && error) |
904 | return error; | |
905 | ||
906 | error = acpi_dev_pm_low_power(dev, adev, target_state); | |
907 | if (error) | |
f35cec25 | 908 | acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); |
e5cc8ef3 RW |
909 | |
910 | return error; | |
911 | } | |
912 | EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); | |
913 | ||
914 | /** | |
915 | * acpi_dev_resume_early - Put device into the full-power state using ACPI. | |
916 | * @dev: Device to put into the full-power state. | |
917 | * | |
918 | * Put the given device into the full-power state using the standard ACPI | |
919 | * mechanism during system transition to the working state. Set the power | |
920 | * state of the device to ACPI D0 and disable remote wakeup. | |
921 | */ | |
922 | int acpi_dev_resume_early(struct device *dev) | |
923 | { | |
79c0373f | 924 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
925 | int error; |
926 | ||
927 | if (!adev) | |
928 | return 0; | |
929 | ||
930 | error = acpi_dev_pm_full_power(adev); | |
f35cec25 | 931 | acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); |
e5cc8ef3 RW |
932 | return error; |
933 | } | |
934 | EXPORT_SYMBOL_GPL(acpi_dev_resume_early); | |
935 | ||
936 | /** | |
937 | * acpi_subsys_prepare - Prepare device for system transition to a sleep state. | |
938 | * @dev: Device to prepare. | |
939 | */ | |
940 | int acpi_subsys_prepare(struct device *dev) | |
941 | { | |
f25c0ae2 RW |
942 | struct acpi_device *adev = ACPI_COMPANION(dev); |
943 | u32 sys_target; | |
944 | int ret, state; | |
945 | ||
946 | ret = pm_generic_prepare(dev); | |
947 | if (ret < 0) | |
948 | return ret; | |
949 | ||
950 | if (!adev || !pm_runtime_suspended(dev) | |
951 | || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) | |
952 | return 0; | |
953 | ||
954 | sys_target = acpi_target_system_state(); | |
955 | if (sys_target == ACPI_STATE_S0) | |
956 | return 1; | |
92858c47 | 957 | |
f25c0ae2 RW |
958 | if (adev->power.flags.dsw_present) |
959 | return 0; | |
960 | ||
961 | ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); | |
962 | return !ret && state == adev->power.state; | |
e5cc8ef3 RW |
963 | } |
964 | EXPORT_SYMBOL_GPL(acpi_subsys_prepare); | |
965 | ||
92858c47 RW |
966 | /** |
967 | * acpi_subsys_suspend - Run the device driver's suspend callback. | |
968 | * @dev: Device to handle. | |
969 | * | |
970 | * Follow PCI and resume devices suspended at run time before running their | |
971 | * system suspend callbacks. | |
972 | */ | |
973 | int acpi_subsys_suspend(struct device *dev) | |
974 | { | |
975 | pm_runtime_resume(dev); | |
976 | return pm_generic_suspend(dev); | |
977 | } | |
4cf563c5 | 978 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend); |
92858c47 | 979 | |
e5cc8ef3 RW |
980 | /** |
981 | * acpi_subsys_suspend_late - Suspend device using ACPI. | |
982 | * @dev: Device to suspend. | |
983 | * | |
984 | * Carry out the generic late suspend procedure for @dev and use ACPI to put | |
985 | * it into a low-power state during system transition into a sleep state. | |
986 | */ | |
987 | int acpi_subsys_suspend_late(struct device *dev) | |
988 | { | |
989 | int ret = pm_generic_suspend_late(dev); | |
990 | return ret ? ret : acpi_dev_suspend_late(dev); | |
991 | } | |
992 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); | |
993 | ||
994 | /** | |
995 | * acpi_subsys_resume_early - Resume device using ACPI. | |
996 | * @dev: Device to Resume. | |
997 | * | |
998 | * Use ACPI to put the given device into the full-power state and carry out the | |
999 | * generic early resume procedure for it during system transition into the | |
1000 | * working state. | |
1001 | */ | |
1002 | int acpi_subsys_resume_early(struct device *dev) | |
1003 | { | |
1004 | int ret = acpi_dev_resume_early(dev); | |
1005 | return ret ? ret : pm_generic_resume_early(dev); | |
1006 | } | |
1007 | EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); | |
92858c47 RW |
1008 | |
1009 | /** | |
1010 | * acpi_subsys_freeze - Run the device driver's freeze callback. | |
1011 | * @dev: Device to handle. | |
1012 | */ | |
1013 | int acpi_subsys_freeze(struct device *dev) | |
1014 | { | |
1015 | /* | |
1016 | * This used to be done in acpi_subsys_prepare() for all devices and | |
1017 | * some drivers may depend on it, so do it here. Ideally, however, | |
1018 | * runtime-suspended devices should not be touched during freeze/thaw | |
1019 | * transitions. | |
1020 | */ | |
1021 | pm_runtime_resume(dev); | |
1022 | return pm_generic_freeze(dev); | |
1023 | } | |
4cf563c5 | 1024 | EXPORT_SYMBOL_GPL(acpi_subsys_freeze); |
92858c47 | 1025 | |
e5cc8ef3 RW |
1026 | #endif /* CONFIG_PM_SLEEP */ |
1027 | ||
1028 | static struct dev_pm_domain acpi_general_pm_domain = { | |
1029 | .ops = { | |
e5cc8ef3 RW |
1030 | .runtime_suspend = acpi_subsys_runtime_suspend, |
1031 | .runtime_resume = acpi_subsys_runtime_resume, | |
e5cc8ef3 RW |
1032 | #ifdef CONFIG_PM_SLEEP |
1033 | .prepare = acpi_subsys_prepare, | |
58a1fbbb | 1034 | .complete = pm_complete_with_resume_check, |
92858c47 | 1035 | .suspend = acpi_subsys_suspend, |
e5cc8ef3 RW |
1036 | .suspend_late = acpi_subsys_suspend_late, |
1037 | .resume_early = acpi_subsys_resume_early, | |
92858c47 RW |
1038 | .freeze = acpi_subsys_freeze, |
1039 | .poweroff = acpi_subsys_suspend, | |
e5cc8ef3 RW |
1040 | .poweroff_late = acpi_subsys_suspend_late, |
1041 | .restore_early = acpi_subsys_resume_early, | |
1042 | #endif | |
1043 | }, | |
1044 | }; | |
1045 | ||
91d66cd2 UH |
1046 | /** |
1047 | * acpi_dev_pm_detach - Remove ACPI power management from the device. | |
1048 | * @dev: Device to take care of. | |
1049 | * @power_off: Whether or not to try to remove power from the device. | |
1050 | * | |
1051 | * Remove the device from the general ACPI PM domain and remove its wakeup | |
1052 | * notifier. If @power_off is set, additionally remove power from the device if | |
1053 | * possible. | |
1054 | * | |
1055 | * Callers must ensure proper synchronization of this function with power | |
1056 | * management callbacks. | |
1057 | */ | |
1058 | static void acpi_dev_pm_detach(struct device *dev, bool power_off) | |
1059 | { | |
1060 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1061 | ||
1062 | if (adev && dev->pm_domain == &acpi_general_pm_domain) { | |
989561de | 1063 | dev_pm_domain_set(dev, NULL); |
91d66cd2 UH |
1064 | acpi_remove_pm_notifier(adev); |
1065 | if (power_off) { | |
1066 | /* | |
1067 | * If the device's PM QoS resume latency limit or flags | |
1068 | * have been exposed to user space, they have to be | |
1069 | * hidden at this point, so that they don't affect the | |
1070 | * choice of the low-power state to put the device into. | |
1071 | */ | |
1072 | dev_pm_qos_hide_latency_limit(dev); | |
1073 | dev_pm_qos_hide_flags(dev); | |
1074 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); | |
1075 | acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
1076 | } | |
1077 | } | |
1078 | } | |
1079 | ||
e5cc8ef3 RW |
1080 | /** |
1081 | * acpi_dev_pm_attach - Prepare device for ACPI power management. | |
1082 | * @dev: Device to prepare. | |
b88ce2a4 | 1083 | * @power_on: Whether or not to power on the device. |
e5cc8ef3 RW |
1084 | * |
1085 | * If @dev has a valid ACPI handle that has a valid struct acpi_device object | |
1086 | * attached to it, install a wakeup notification handler for the device and | |
b88ce2a4 RW |
1087 | * add it to the general ACPI PM domain. If @power_on is set, the device will |
1088 | * be put into the ACPI D0 state before the function returns. | |
e5cc8ef3 RW |
1089 | * |
1090 | * This assumes that the @dev's bus type uses generic power management callbacks | |
1091 | * (or doesn't use any power management callbacks at all). | |
1092 | * | |
1093 | * Callers must ensure proper synchronization of this function with power | |
1094 | * management callbacks. | |
1095 | */ | |
b88ce2a4 | 1096 | int acpi_dev_pm_attach(struct device *dev, bool power_on) |
e5cc8ef3 | 1097 | { |
79c0373f | 1098 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
1099 | |
1100 | if (!adev) | |
1101 | return -ENODEV; | |
1102 | ||
1103 | if (dev->pm_domain) | |
1104 | return -EEXIST; | |
1105 | ||
712e960f MW |
1106 | /* |
1107 | * Only attach the power domain to the first device if the | |
1108 | * companion is shared by multiple. This is to prevent doing power | |
1109 | * management twice. | |
1110 | */ | |
1111 | if (!acpi_device_is_first_physical_node(adev, dev)) | |
1112 | return -EBUSY; | |
1113 | ||
c072530f | 1114 | acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); |
989561de | 1115 | dev_pm_domain_set(dev, &acpi_general_pm_domain); |
b88ce2a4 RW |
1116 | if (power_on) { |
1117 | acpi_dev_pm_full_power(adev); | |
f35cec25 | 1118 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
b88ce2a4 | 1119 | } |
86f1e15f UH |
1120 | |
1121 | dev->pm_domain->detach = acpi_dev_pm_detach; | |
e5cc8ef3 RW |
1122 | return 0; |
1123 | } | |
1124 | EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); | |
ec4602a9 | 1125 | #endif /* CONFIG_PM */ |