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