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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 | |
20dacb71 RW |
101 | * shallower than the actual power state of the device, because |
102 | * the same power resources may be referenced by other devices. | |
75eb2d13 | 103 | * |
20dacb71 RW |
104 | * For systems predating ACPI 4.0 we assume that D3hot is the |
105 | * deepest state that can be supported. | |
75eb2d13 RW |
106 | */ |
107 | if (psc > result && psc < ACPI_STATE_D3_COLD) | |
108 | result = psc; | |
109 | else if (result == ACPI_STATE_UNKNOWN) | |
20dacb71 | 110 | result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc; |
9ce4e607 RW |
111 | } |
112 | ||
113 | /* | |
114 | * If we were unsure about the device parent's power state up to this | |
115 | * point, the fact that the device is in D0 implies that the parent has | |
644f17ad | 116 | * to be in D0 too, except if ignore_parent is set. |
9ce4e607 | 117 | */ |
644f17ad MW |
118 | if (!device->power.flags.ignore_parent && device->parent |
119 | && device->parent->power.state == ACPI_STATE_UNKNOWN | |
9ce4e607 RW |
120 | && result == ACPI_STATE_D0) |
121 | device->parent->power.state = ACPI_STATE_D0; | |
122 | ||
123 | *state = result; | |
124 | ||
125 | out: | |
126 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", | |
127 | device->pnp.bus_id, acpi_power_state_string(*state))); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
9c0f45e3 RW |
132 | static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
133 | { | |
134 | if (adev->power.states[state].flags.explicit_set) { | |
135 | char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; | |
136 | acpi_status status; | |
137 | ||
138 | status = acpi_evaluate_object(adev->handle, method, NULL, NULL); | |
139 | if (ACPI_FAILURE(status)) | |
140 | return -ENODEV; | |
141 | } | |
142 | return 0; | |
143 | } | |
144 | ||
9ce4e607 RW |
145 | /** |
146 | * acpi_device_set_power - Set power state of an ACPI device. | |
147 | * @device: Device to set the power state of. | |
148 | * @state: New power state to set. | |
149 | * | |
150 | * Callers must ensure that the device is power manageable before using this | |
151 | * function. | |
152 | */ | |
153 | int acpi_device_set_power(struct acpi_device *device, int state) | |
154 | { | |
20dacb71 | 155 | int target_state = state; |
9ce4e607 | 156 | int result = 0; |
9ce4e607 | 157 | |
2c7d132a RW |
158 | if (!device || !device->flags.power_manageable |
159 | || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) | |
9ce4e607 RW |
160 | return -EINVAL; |
161 | ||
162 | /* Make sure this is a valid target state */ | |
163 | ||
164 | if (state == device->power.state) { | |
b69137a7 RW |
165 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", |
166 | device->pnp.bus_id, | |
9ce4e607 RW |
167 | acpi_power_state_string(state))); |
168 | return 0; | |
169 | } | |
170 | ||
20dacb71 RW |
171 | if (state == ACPI_STATE_D3_COLD) { |
172 | /* | |
173 | * For transitions to D3cold we need to execute _PS3 and then | |
174 | * possibly drop references to the power resources in use. | |
175 | */ | |
176 | state = ACPI_STATE_D3_HOT; | |
177 | /* If _PR3 is not available, use D3hot as the target state. */ | |
178 | if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) | |
179 | target_state = state; | |
180 | } else if (!device->power.states[state].flags.valid) { | |
b69137a7 RW |
181 | dev_warn(&device->dev, "Power state %s not supported\n", |
182 | acpi_power_state_string(state)); | |
9ce4e607 RW |
183 | return -ENODEV; |
184 | } | |
20dacb71 | 185 | |
644f17ad MW |
186 | if (!device->power.flags.ignore_parent && |
187 | device->parent && (state < device->parent->power.state)) { | |
b69137a7 | 188 | dev_warn(&device->dev, |
593298e6 AL |
189 | "Cannot transition to power state %s for parent in %s\n", |
190 | acpi_power_state_string(state), | |
191 | acpi_power_state_string(device->parent->power.state)); | |
9ce4e607 RW |
192 | return -ENODEV; |
193 | } | |
194 | ||
9ce4e607 RW |
195 | /* |
196 | * Transition Power | |
197 | * ---------------- | |
20dacb71 RW |
198 | * In accordance with ACPI 6, _PSx is executed before manipulating power |
199 | * resources, unless the target state is D0, in which case _PS0 is | |
200 | * supposed to be executed after turning the power resources on. | |
9ce4e607 | 201 | */ |
20dacb71 RW |
202 | if (state > ACPI_STATE_D0) { |
203 | /* | |
204 | * According to ACPI 6, devices cannot go from lower-power | |
205 | * (deeper) states to higher-power (shallower) states. | |
206 | */ | |
207 | if (state < device->power.state) { | |
208 | dev_warn(&device->dev, "Cannot transition from %s to %s\n", | |
209 | acpi_power_state_string(device->power.state), | |
210 | acpi_power_state_string(state)); | |
211 | return -ENODEV; | |
212 | } | |
213 | ||
214 | result = acpi_dev_pm_explicit_set(device, state); | |
9c0f45e3 RW |
215 | if (result) |
216 | goto end; | |
9ce4e607 | 217 | |
20dacb71 RW |
218 | if (device->power.flags.power_resources) |
219 | result = acpi_power_transition(device, target_state); | |
220 | } else { | |
221 | if (device->power.flags.power_resources) { | |
222 | result = acpi_power_transition(device, ACPI_STATE_D0); | |
223 | if (result) | |
224 | goto end; | |
225 | } | |
226 | result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
e5656271 | 227 | } |
9ce4e607 | 228 | |
e78adb75 RW |
229 | end: |
230 | if (result) { | |
b69137a7 RW |
231 | dev_warn(&device->dev, "Failed to change power state to %s\n", |
232 | acpi_power_state_string(state)); | |
e78adb75 | 233 | } else { |
71b65445 | 234 | device->power.state = target_state; |
9ce4e607 RW |
235 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
236 | "Device [%s] transitioned to %s\n", | |
237 | device->pnp.bus_id, | |
238 | acpi_power_state_string(state))); | |
239 | } | |
240 | ||
241 | return result; | |
242 | } | |
243 | EXPORT_SYMBOL(acpi_device_set_power); | |
244 | ||
245 | int acpi_bus_set_power(acpi_handle handle, int state) | |
246 | { | |
247 | struct acpi_device *device; | |
248 | int result; | |
249 | ||
250 | result = acpi_bus_get_device(handle, &device); | |
251 | if (result) | |
252 | return result; | |
253 | ||
9ce4e607 RW |
254 | return acpi_device_set_power(device, state); |
255 | } | |
256 | EXPORT_SYMBOL(acpi_bus_set_power); | |
257 | ||
258 | int acpi_bus_init_power(struct acpi_device *device) | |
259 | { | |
260 | int state; | |
261 | int result; | |
262 | ||
263 | if (!device) | |
264 | return -EINVAL; | |
265 | ||
266 | device->power.state = ACPI_STATE_UNKNOWN; | |
202317a5 | 267 | if (!acpi_device_is_present(device)) |
1b1f3e16 | 268 | return -ENXIO; |
9ce4e607 RW |
269 | |
270 | result = acpi_device_get_power(device, &state); | |
271 | if (result) | |
272 | return result; | |
273 | ||
a2367807 | 274 | if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { |
20dacb71 | 275 | /* Reference count the power resources. */ |
9ce4e607 | 276 | result = acpi_power_on_resources(device, state); |
a2367807 RW |
277 | if (result) |
278 | return result; | |
9ce4e607 | 279 | |
20dacb71 RW |
280 | if (state == ACPI_STATE_D0) { |
281 | /* | |
282 | * If _PSC is not present and the state inferred from | |
283 | * power resources appears to be D0, it still may be | |
284 | * necessary to execute _PS0 at this point, because | |
285 | * another device using the same power resources may | |
286 | * have been put into D0 previously and that's why we | |
287 | * see D0 here. | |
288 | */ | |
289 | result = acpi_dev_pm_explicit_set(device, state); | |
290 | if (result) | |
291 | return result; | |
292 | } | |
b3785492 | 293 | } else if (state == ACPI_STATE_UNKNOWN) { |
7cd8407d RW |
294 | /* |
295 | * No power resources and missing _PSC? Cross fingers and make | |
296 | * it D0 in hope that this is what the BIOS put the device into. | |
297 | * [We tried to force D0 here by executing _PS0, but that broke | |
298 | * Toshiba P870-303 in a nasty way.] | |
299 | */ | |
b3785492 | 300 | state = ACPI_STATE_D0; |
a2367807 RW |
301 | } |
302 | device->power.state = state; | |
303 | return 0; | |
9ce4e607 RW |
304 | } |
305 | ||
b9e95fc6 RW |
306 | /** |
307 | * acpi_device_fix_up_power - Force device with missing _PSC into D0. | |
308 | * @device: Device object whose power state is to be fixed up. | |
309 | * | |
310 | * Devices without power resources and _PSC, but having _PS0 and _PS3 defined, | |
311 | * are assumed to be put into D0 by the BIOS. However, in some cases that may | |
312 | * not be the case and this function should be used then. | |
313 | */ | |
314 | int acpi_device_fix_up_power(struct acpi_device *device) | |
315 | { | |
316 | int ret = 0; | |
317 | ||
318 | if (!device->power.flags.power_resources | |
319 | && !device->power.flags.explicit_get | |
320 | && device->power.state == ACPI_STATE_D0) | |
321 | ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
322 | ||
323 | return ret; | |
324 | } | |
325 | ||
202317a5 | 326 | int acpi_device_update_power(struct acpi_device *device, int *state_p) |
9ce4e607 | 327 | { |
9ce4e607 RW |
328 | int state; |
329 | int result; | |
330 | ||
202317a5 RW |
331 | if (device->power.state == ACPI_STATE_UNKNOWN) { |
332 | result = acpi_bus_init_power(device); | |
333 | if (!result && state_p) | |
334 | *state_p = device->power.state; | |
335 | ||
9ce4e607 | 336 | return result; |
202317a5 | 337 | } |
9ce4e607 RW |
338 | |
339 | result = acpi_device_get_power(device, &state); | |
340 | if (result) | |
341 | return result; | |
342 | ||
91bdad0b | 343 | if (state == ACPI_STATE_UNKNOWN) { |
511d5c42 | 344 | state = ACPI_STATE_D0; |
91bdad0b RW |
345 | result = acpi_device_set_power(device, state); |
346 | if (result) | |
347 | return result; | |
348 | } else { | |
349 | if (device->power.flags.power_resources) { | |
350 | /* | |
351 | * We don't need to really switch the state, bu we need | |
352 | * to update the power resources' reference counters. | |
353 | */ | |
354 | result = acpi_power_transition(device, state); | |
355 | if (result) | |
356 | return result; | |
357 | } | |
358 | device->power.state = state; | |
359 | } | |
360 | if (state_p) | |
9ce4e607 RW |
361 | *state_p = state; |
362 | ||
91bdad0b | 363 | return 0; |
9ce4e607 | 364 | } |
2bb3a2bf | 365 | EXPORT_SYMBOL_GPL(acpi_device_update_power); |
202317a5 RW |
366 | |
367 | int acpi_bus_update_power(acpi_handle handle, int *state_p) | |
368 | { | |
369 | struct acpi_device *device; | |
370 | int result; | |
371 | ||
372 | result = acpi_bus_get_device(handle, &device); | |
373 | return result ? result : acpi_device_update_power(device, state_p); | |
374 | } | |
9ce4e607 RW |
375 | EXPORT_SYMBOL_GPL(acpi_bus_update_power); |
376 | ||
377 | bool acpi_bus_power_manageable(acpi_handle handle) | |
378 | { | |
379 | struct acpi_device *device; | |
380 | int result; | |
381 | ||
382 | result = acpi_bus_get_device(handle, &device); | |
383 | return result ? false : device->flags.power_manageable; | |
384 | } | |
385 | EXPORT_SYMBOL(acpi_bus_power_manageable); | |
386 | ||
ec4602a9 RW |
387 | #ifdef CONFIG_PM |
388 | static DEFINE_MUTEX(acpi_pm_notifier_lock); | |
389 | ||
c072530f RW |
390 | static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) |
391 | { | |
392 | struct acpi_device *adev; | |
393 | ||
394 | if (val != ACPI_NOTIFY_DEVICE_WAKE) | |
395 | return; | |
396 | ||
397 | adev = acpi_bus_get_acpi_device(handle); | |
398 | if (!adev) | |
399 | return; | |
400 | ||
401 | mutex_lock(&acpi_pm_notifier_lock); | |
402 | ||
403 | if (adev->wakeup.flags.notifier_present) { | |
404 | __pm_wakeup_event(adev->wakeup.ws, 0); | |
405 | if (adev->wakeup.context.work.func) | |
406 | queue_pm_work(&adev->wakeup.context.work); | |
407 | } | |
408 | ||
409 | mutex_unlock(&acpi_pm_notifier_lock); | |
410 | ||
411 | acpi_bus_put_acpi_device(adev); | |
412 | } | |
413 | ||
ec4602a9 | 414 | /** |
c072530f RW |
415 | * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. |
416 | * @adev: ACPI device to add the notify handler for. | |
417 | * @dev: Device to generate a wakeup event for while handling the notification. | |
418 | * @work_func: Work function to execute when handling the notification. | |
ec4602a9 RW |
419 | * |
420 | * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of | |
421 | * PM wakeup events. For example, wakeup events may be generated for bridges | |
422 | * if one of the devices below the bridge is signaling wakeup, even if the | |
423 | * bridge itself doesn't have a wakeup GPE associated with it. | |
424 | */ | |
c072530f RW |
425 | acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, |
426 | void (*work_func)(struct work_struct *work)) | |
ec4602a9 RW |
427 | { |
428 | acpi_status status = AE_ALREADY_EXISTS; | |
429 | ||
c072530f RW |
430 | if (!dev && !work_func) |
431 | return AE_BAD_PARAMETER; | |
432 | ||
ec4602a9 RW |
433 | mutex_lock(&acpi_pm_notifier_lock); |
434 | ||
435 | if (adev->wakeup.flags.notifier_present) | |
436 | goto out; | |
437 | ||
c072530f RW |
438 | adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev)); |
439 | adev->wakeup.context.dev = dev; | |
440 | if (work_func) | |
441 | INIT_WORK(&adev->wakeup.context.work, work_func); | |
442 | ||
443 | status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, | |
444 | acpi_pm_notify_handler, NULL); | |
ec4602a9 RW |
445 | if (ACPI_FAILURE(status)) |
446 | goto out; | |
447 | ||
448 | adev->wakeup.flags.notifier_present = true; | |
449 | ||
450 | out: | |
451 | mutex_unlock(&acpi_pm_notifier_lock); | |
452 | return status; | |
453 | } | |
454 | ||
455 | /** | |
456 | * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
457 | * @adev: ACPI device to remove the notifier from. | |
458 | */ | |
c072530f | 459 | acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) |
ec4602a9 RW |
460 | { |
461 | acpi_status status = AE_BAD_PARAMETER; | |
462 | ||
463 | mutex_lock(&acpi_pm_notifier_lock); | |
464 | ||
465 | if (!adev->wakeup.flags.notifier_present) | |
466 | goto out; | |
467 | ||
468 | status = acpi_remove_notify_handler(adev->handle, | |
469 | ACPI_SYSTEM_NOTIFY, | |
c072530f | 470 | acpi_pm_notify_handler); |
ec4602a9 RW |
471 | if (ACPI_FAILURE(status)) |
472 | goto out; | |
473 | ||
c072530f RW |
474 | if (adev->wakeup.context.work.func) { |
475 | cancel_work_sync(&adev->wakeup.context.work); | |
476 | adev->wakeup.context.work.func = NULL; | |
477 | } | |
478 | adev->wakeup.context.dev = NULL; | |
479 | wakeup_source_unregister(adev->wakeup.ws); | |
480 | ||
ec4602a9 RW |
481 | adev->wakeup.flags.notifier_present = false; |
482 | ||
483 | out: | |
484 | mutex_unlock(&acpi_pm_notifier_lock); | |
485 | return status; | |
486 | } | |
487 | ||
9ce4e607 RW |
488 | bool acpi_bus_can_wakeup(acpi_handle handle) |
489 | { | |
490 | struct acpi_device *device; | |
491 | int result; | |
492 | ||
493 | result = acpi_bus_get_device(handle, &device); | |
494 | return result ? false : device->wakeup.flags.valid; | |
495 | } | |
496 | EXPORT_SYMBOL(acpi_bus_can_wakeup); | |
497 | ||
86b3832c | 498 | /** |
b25c77ef | 499 | * acpi_dev_pm_get_state - Get preferred power state of ACPI device. |
86b3832c RW |
500 | * @dev: Device whose preferred target power state to return. |
501 | * @adev: ACPI device node corresponding to @dev. | |
502 | * @target_state: System state to match the resultant device state. | |
fa1675b5 RW |
503 | * @d_min_p: Location to store the highest power state available to the device. |
504 | * @d_max_p: Location to store the lowest power state available to the device. | |
86b3832c | 505 | * |
fa1675b5 RW |
506 | * Find the lowest power (highest number) and highest power (lowest number) ACPI |
507 | * device power states that the device can be in while the system is in the | |
508 | * state represented by @target_state. Store the integer numbers representing | |
509 | * those stats in the memory locations pointed to by @d_max_p and @d_min_p, | |
510 | * respectively. | |
86b3832c RW |
511 | * |
512 | * Callers must ensure that @dev and @adev are valid pointers and that @adev | |
513 | * actually corresponds to @dev before using this function. | |
fa1675b5 RW |
514 | * |
515 | * Returns 0 on success or -ENODATA when one of the ACPI methods fails or | |
516 | * returns a value that doesn't make sense. The memory locations pointed to by | |
517 | * @d_max_p and @d_min_p are only modified on success. | |
86b3832c | 518 | */ |
b25c77ef | 519 | static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, |
fa1675b5 | 520 | u32 target_state, int *d_min_p, int *d_max_p) |
86b3832c | 521 | { |
fa1675b5 RW |
522 | char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; |
523 | acpi_handle handle = adev->handle; | |
524 | unsigned long long ret; | |
525 | int d_min, d_max; | |
86b3832c | 526 | bool wakeup = false; |
fa1675b5 | 527 | acpi_status status; |
86b3832c | 528 | |
86b3832c | 529 | /* |
fa1675b5 RW |
530 | * If the system state is S0, the lowest power state the device can be |
531 | * in is D3cold, unless the device has _S0W and is supposed to signal | |
532 | * wakeup, in which case the return value of _S0W has to be used as the | |
533 | * lowest power state available to the device. | |
86b3832c RW |
534 | */ |
535 | d_min = ACPI_STATE_D0; | |
4c164ae7 | 536 | d_max = ACPI_STATE_D3_COLD; |
86b3832c RW |
537 | |
538 | /* | |
539 | * If present, _SxD methods return the minimum D-state (highest power | |
540 | * state) we can use for the corresponding S-states. Otherwise, the | |
541 | * minimum D-state is D0 (ACPI 3.x). | |
86b3832c RW |
542 | */ |
543 | if (target_state > ACPI_STATE_S0) { | |
fa1675b5 RW |
544 | /* |
545 | * We rely on acpi_evaluate_integer() not clobbering the integer | |
546 | * provided if AE_NOT_FOUND is returned. | |
547 | */ | |
548 | ret = d_min; | |
549 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
550 | if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) | |
551 | || ret > ACPI_STATE_D3_COLD) | |
552 | return -ENODATA; | |
553 | ||
554 | /* | |
555 | * We need to handle legacy systems where D3hot and D3cold are | |
556 | * the same and 3 is returned in both cases, so fall back to | |
557 | * D3cold if D3hot is not a valid state. | |
558 | */ | |
559 | if (!adev->power.states[ret].flags.valid) { | |
560 | if (ret == ACPI_STATE_D3_HOT) | |
561 | ret = ACPI_STATE_D3_COLD; | |
562 | else | |
563 | return -ENODATA; | |
564 | } | |
565 | d_min = ret; | |
86b3832c RW |
566 | wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid |
567 | && adev->wakeup.sleep_state >= target_state; | |
568 | } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != | |
569 | PM_QOS_FLAGS_NONE) { | |
570 | wakeup = adev->wakeup.flags.valid; | |
571 | } | |
572 | ||
573 | /* | |
574 | * If _PRW says we can wake up the system from the target sleep state, | |
575 | * the D-state returned by _SxD is sufficient for that (we assume a | |
576 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
577 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
578 | * can wake the system. _S0W may be valid, too. | |
579 | */ | |
580 | if (wakeup) { | |
fa1675b5 RW |
581 | method[3] = 'W'; |
582 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
583 | if (status == AE_NOT_FOUND) { | |
584 | if (target_state > ACPI_STATE_S0) | |
86b3832c | 585 | d_max = d_min; |
fa1675b5 RW |
586 | } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { |
587 | /* Fall back to D3cold if ret is not a valid state. */ | |
588 | if (!adev->power.states[ret].flags.valid) | |
589 | ret = ACPI_STATE_D3_COLD; | |
590 | ||
591 | d_max = ret > d_min ? ret : d_min; | |
592 | } else { | |
593 | return -ENODATA; | |
86b3832c RW |
594 | } |
595 | } | |
596 | ||
86b3832c RW |
597 | if (d_min_p) |
598 | *d_min_p = d_min; | |
fa1675b5 RW |
599 | |
600 | if (d_max_p) | |
601 | *d_max_p = d_max; | |
602 | ||
603 | return 0; | |
86b3832c | 604 | } |
cd7bd02d | 605 | |
a6ae7594 RW |
606 | /** |
607 | * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. | |
608 | * @dev: Device whose preferred target power state to return. | |
609 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
610 | * @d_max_in: Deepest low-power state to take into consideration. | |
611 | * Return value: Preferred power state of the device on success, -ENODEV | |
fa1675b5 RW |
612 | * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is |
613 | * incorrect, or -ENODATA on ACPI method failure. | |
a6ae7594 RW |
614 | * |
615 | * The caller must ensure that @dev is valid before using this function. | |
616 | */ | |
617 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) | |
618 | { | |
a6ae7594 | 619 | struct acpi_device *adev; |
9b5c7a5a | 620 | int ret, d_min, d_max; |
fa1675b5 RW |
621 | |
622 | if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) | |
623 | return -EINVAL; | |
624 | ||
20dacb71 | 625 | if (d_max_in > ACPI_STATE_D2) { |
fa1675b5 RW |
626 | enum pm_qos_flags_status stat; |
627 | ||
628 | stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); | |
629 | if (stat == PM_QOS_FLAGS_ALL) | |
20dacb71 | 630 | d_max_in = ACPI_STATE_D2; |
fa1675b5 | 631 | } |
a6ae7594 | 632 | |
17653a3e RW |
633 | adev = ACPI_COMPANION(dev); |
634 | if (!adev) { | |
635 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
636 | return -ENODEV; |
637 | } | |
638 | ||
fa1675b5 | 639 | ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), |
9b5c7a5a | 640 | &d_min, &d_max); |
fa1675b5 RW |
641 | if (ret) |
642 | return ret; | |
643 | ||
9b5c7a5a | 644 | if (d_max_in < d_min) |
fa1675b5 RW |
645 | return -EINVAL; |
646 | ||
647 | if (d_max > d_max_in) { | |
9b5c7a5a | 648 | for (d_max = d_max_in; d_max > d_min; d_max--) { |
fa1675b5 RW |
649 | if (adev->power.states[d_max].flags.valid) |
650 | break; | |
651 | } | |
652 | } | |
9b5c7a5a RW |
653 | |
654 | if (d_min_p) | |
655 | *d_min_p = d_min; | |
656 | ||
fa1675b5 | 657 | return d_max; |
a6ae7594 RW |
658 | } |
659 | EXPORT_SYMBOL(acpi_pm_device_sleep_state); | |
660 | ||
e5cc8ef3 | 661 | /** |
c072530f RW |
662 | * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. |
663 | * @work: Work item to handle. | |
e5cc8ef3 | 664 | */ |
c072530f | 665 | static void acpi_pm_notify_work_func(struct work_struct *work) |
e5cc8ef3 | 666 | { |
c072530f | 667 | struct device *dev; |
e5cc8ef3 | 668 | |
c072530f RW |
669 | dev = container_of(work, struct acpi_device_wakeup_context, work)->dev; |
670 | if (dev) { | |
e5cc8ef3 RW |
671 | pm_wakeup_event(dev, 0); |
672 | pm_runtime_resume(dev); | |
673 | } | |
674 | } | |
675 | ||
cd7bd02d | 676 | /** |
f35cec25 RW |
677 | * acpi_device_wakeup - Enable/disable wakeup functionality for device. |
678 | * @adev: ACPI device to enable/disable wakeup functionality for. | |
679 | * @target_state: State the system is transitioning into. | |
cd7bd02d RW |
680 | * @enable: Whether to enable or disable the wakeup functionality. |
681 | * | |
dee8370c RW |
682 | * Enable/disable the GPE associated with @adev so that it can generate |
683 | * wakeup signals for the device in response to external (remote) events and | |
684 | * enable/disable device wakeup power. | |
685 | * | |
686 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
687 | * this function. | |
688 | */ | |
f35cec25 RW |
689 | static int acpi_device_wakeup(struct acpi_device *adev, u32 target_state, |
690 | bool enable) | |
dee8370c RW |
691 | { |
692 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
693 | ||
694 | if (enable) { | |
695 | acpi_status res; | |
696 | int error; | |
697 | ||
f35cec25 | 698 | error = acpi_enable_wakeup_device_power(adev, target_state); |
dee8370c RW |
699 | if (error) |
700 | return error; | |
701 | ||
175f8e26 RW |
702 | if (adev->wakeup.flags.enabled) |
703 | return 0; | |
704 | ||
dee8370c | 705 | res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
175f8e26 RW |
706 | if (ACPI_SUCCESS(res)) { |
707 | adev->wakeup.flags.enabled = 1; | |
708 | } else { | |
dee8370c RW |
709 | acpi_disable_wakeup_device_power(adev); |
710 | return -EIO; | |
711 | } | |
712 | } else { | |
175f8e26 RW |
713 | if (adev->wakeup.flags.enabled) { |
714 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
715 | adev->wakeup.flags.enabled = 0; | |
716 | } | |
dee8370c RW |
717 | acpi_disable_wakeup_device_power(adev); |
718 | } | |
719 | return 0; | |
720 | } | |
721 | ||
722 | /** | |
723 | * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. | |
724 | * @dev: Device to enable/disable the platform to wake up. | |
725 | * @enable: Whether to enable or disable the wakeup functionality. | |
cd7bd02d RW |
726 | */ |
727 | int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) | |
728 | { | |
dee8370c | 729 | struct acpi_device *adev; |
cd7bd02d RW |
730 | |
731 | if (!device_run_wake(phys_dev)) | |
732 | return -EINVAL; | |
733 | ||
17653a3e RW |
734 | adev = ACPI_COMPANION(phys_dev); |
735 | if (!adev) { | |
736 | dev_dbg(phys_dev, "ACPI companion missing in %s!\n", __func__); | |
cd7bd02d RW |
737 | return -ENODEV; |
738 | } | |
739 | ||
67598a1d | 740 | return acpi_device_wakeup(adev, ACPI_STATE_S0, enable); |
cd7bd02d RW |
741 | } |
742 | EXPORT_SYMBOL(acpi_pm_device_run_wake); | |
dee8370c | 743 | |
4d56410b | 744 | #ifdef CONFIG_PM_SLEEP |
a6ae7594 RW |
745 | /** |
746 | * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system. | |
747 | * @dev: Device to enable/desible to wake up the system from sleep states. | |
748 | * @enable: Whether to enable or disable @dev to wake up the system. | |
749 | */ | |
750 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
751 | { | |
a6ae7594 RW |
752 | struct acpi_device *adev; |
753 | int error; | |
754 | ||
755 | if (!device_can_wakeup(dev)) | |
756 | return -EINVAL; | |
757 | ||
17653a3e RW |
758 | adev = ACPI_COMPANION(dev); |
759 | if (!adev) { | |
760 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
761 | return -ENODEV; |
762 | } | |
763 | ||
f35cec25 | 764 | error = acpi_device_wakeup(adev, acpi_target_system_state(), enable); |
a6ae7594 RW |
765 | if (!error) |
766 | dev_info(dev, "System wakeup %s by ACPI\n", | |
767 | enable ? "enabled" : "disabled"); | |
768 | ||
769 | return error; | |
770 | } | |
dee8370c | 771 | #endif /* CONFIG_PM_SLEEP */ |
e5cc8ef3 | 772 | |
e5cc8ef3 RW |
773 | /** |
774 | * acpi_dev_pm_low_power - Put ACPI device into a low-power state. | |
775 | * @dev: Device to put into a low-power state. | |
776 | * @adev: ACPI device node corresponding to @dev. | |
777 | * @system_state: System state to choose the device state for. | |
778 | */ | |
779 | static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, | |
780 | u32 system_state) | |
781 | { | |
fa1675b5 | 782 | int ret, state; |
e5cc8ef3 RW |
783 | |
784 | if (!acpi_device_power_manageable(adev)) | |
785 | return 0; | |
786 | ||
fa1675b5 RW |
787 | ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); |
788 | return ret ? ret : acpi_device_set_power(adev, state); | |
e5cc8ef3 RW |
789 | } |
790 | ||
791 | /** | |
792 | * acpi_dev_pm_full_power - Put ACPI device into the full-power state. | |
793 | * @adev: ACPI device node to put into the full-power state. | |
794 | */ | |
795 | static int acpi_dev_pm_full_power(struct acpi_device *adev) | |
796 | { | |
797 | return acpi_device_power_manageable(adev) ? | |
798 | acpi_device_set_power(adev, ACPI_STATE_D0) : 0; | |
799 | } | |
800 | ||
e5cc8ef3 RW |
801 | /** |
802 | * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. | |
803 | * @dev: Device to put into a low-power state. | |
804 | * | |
805 | * Put the given device into a runtime low-power state using the standard ACPI | |
806 | * mechanism. Set up remote wakeup if desired, choose the state to put the | |
807 | * device into (this checks if remote wakeup is expected to work too), and set | |
808 | * the power state of the device. | |
809 | */ | |
810 | int acpi_dev_runtime_suspend(struct device *dev) | |
811 | { | |
79c0373f | 812 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
813 | bool remote_wakeup; |
814 | int error; | |
815 | ||
816 | if (!adev) | |
817 | return 0; | |
818 | ||
819 | remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > | |
820 | PM_QOS_FLAGS_NONE; | |
f35cec25 | 821 | error = acpi_device_wakeup(adev, ACPI_STATE_S0, remote_wakeup); |
e5cc8ef3 RW |
822 | if (remote_wakeup && error) |
823 | return -EAGAIN; | |
824 | ||
825 | error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
826 | if (error) | |
f35cec25 | 827 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
e5cc8ef3 RW |
828 | |
829 | return error; | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); | |
832 | ||
833 | /** | |
834 | * acpi_dev_runtime_resume - Put device into the full-power state using ACPI. | |
835 | * @dev: Device to put into the full-power state. | |
836 | * | |
837 | * Put the given device into the full-power state using the standard ACPI | |
838 | * mechanism at run time. Set the power state of the device to ACPI D0 and | |
839 | * disable remote wakeup. | |
840 | */ | |
841 | int acpi_dev_runtime_resume(struct device *dev) | |
842 | { | |
79c0373f | 843 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
844 | int error; |
845 | ||
846 | if (!adev) | |
847 | return 0; | |
848 | ||
849 | error = acpi_dev_pm_full_power(adev); | |
f35cec25 | 850 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
e5cc8ef3 RW |
851 | return error; |
852 | } | |
853 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); | |
854 | ||
855 | /** | |
856 | * acpi_subsys_runtime_suspend - Suspend device using ACPI. | |
857 | * @dev: Device to suspend. | |
858 | * | |
859 | * Carry out the generic runtime suspend procedure for @dev and use ACPI to put | |
860 | * it into a runtime low-power state. | |
861 | */ | |
862 | int acpi_subsys_runtime_suspend(struct device *dev) | |
863 | { | |
864 | int ret = pm_generic_runtime_suspend(dev); | |
865 | return ret ? ret : acpi_dev_runtime_suspend(dev); | |
866 | } | |
867 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); | |
868 | ||
869 | /** | |
870 | * acpi_subsys_runtime_resume - Resume device using ACPI. | |
871 | * @dev: Device to Resume. | |
872 | * | |
873 | * Use ACPI to put the given device into the full-power state and carry out the | |
874 | * generic runtime resume procedure for it. | |
875 | */ | |
876 | int acpi_subsys_runtime_resume(struct device *dev) | |
877 | { | |
878 | int ret = acpi_dev_runtime_resume(dev); | |
879 | return ret ? ret : pm_generic_runtime_resume(dev); | |
880 | } | |
881 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); | |
e5cc8ef3 RW |
882 | |
883 | #ifdef CONFIG_PM_SLEEP | |
884 | /** | |
885 | * acpi_dev_suspend_late - Put device into a low-power state using ACPI. | |
886 | * @dev: Device to put into a low-power state. | |
887 | * | |
888 | * Put the given device into a low-power state during system transition to a | |
889 | * sleep state using the standard ACPI mechanism. Set up system wakeup if | |
890 | * desired, choose the state to put the device into (this checks if system | |
891 | * wakeup is expected to work too), and set the power state of the device. | |
892 | */ | |
893 | int acpi_dev_suspend_late(struct device *dev) | |
894 | { | |
79c0373f | 895 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
896 | u32 target_state; |
897 | bool wakeup; | |
898 | int error; | |
899 | ||
900 | if (!adev) | |
901 | return 0; | |
902 | ||
903 | target_state = acpi_target_system_state(); | |
78579b7c | 904 | wakeup = device_may_wakeup(dev) && acpi_device_can_wakeup(adev); |
f35cec25 | 905 | error = acpi_device_wakeup(adev, target_state, wakeup); |
e5cc8ef3 RW |
906 | if (wakeup && error) |
907 | return error; | |
908 | ||
909 | error = acpi_dev_pm_low_power(dev, adev, target_state); | |
910 | if (error) | |
f35cec25 | 911 | acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); |
e5cc8ef3 RW |
912 | |
913 | return error; | |
914 | } | |
915 | EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); | |
916 | ||
917 | /** | |
918 | * acpi_dev_resume_early - Put device into the full-power state using ACPI. | |
919 | * @dev: Device to put into the full-power state. | |
920 | * | |
921 | * Put the given device into the full-power state using the standard ACPI | |
922 | * mechanism during system transition to the working state. Set the power | |
923 | * state of the device to ACPI D0 and disable remote wakeup. | |
924 | */ | |
925 | int acpi_dev_resume_early(struct device *dev) | |
926 | { | |
79c0373f | 927 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
928 | int error; |
929 | ||
930 | if (!adev) | |
931 | return 0; | |
932 | ||
933 | error = acpi_dev_pm_full_power(adev); | |
f35cec25 | 934 | acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); |
e5cc8ef3 RW |
935 | return error; |
936 | } | |
937 | EXPORT_SYMBOL_GPL(acpi_dev_resume_early); | |
938 | ||
939 | /** | |
940 | * acpi_subsys_prepare - Prepare device for system transition to a sleep state. | |
941 | * @dev: Device to prepare. | |
942 | */ | |
943 | int acpi_subsys_prepare(struct device *dev) | |
944 | { | |
f25c0ae2 RW |
945 | struct acpi_device *adev = ACPI_COMPANION(dev); |
946 | u32 sys_target; | |
947 | int ret, state; | |
948 | ||
949 | ret = pm_generic_prepare(dev); | |
950 | if (ret < 0) | |
951 | return ret; | |
952 | ||
953 | if (!adev || !pm_runtime_suspended(dev) | |
954 | || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) | |
955 | return 0; | |
956 | ||
957 | sys_target = acpi_target_system_state(); | |
958 | if (sys_target == ACPI_STATE_S0) | |
959 | return 1; | |
92858c47 | 960 | |
f25c0ae2 RW |
961 | if (adev->power.flags.dsw_present) |
962 | return 0; | |
963 | ||
964 | ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); | |
965 | return !ret && state == adev->power.state; | |
e5cc8ef3 RW |
966 | } |
967 | EXPORT_SYMBOL_GPL(acpi_subsys_prepare); | |
968 | ||
f25c0ae2 RW |
969 | /** |
970 | * acpi_subsys_complete - Finalize device's resume during system resume. | |
971 | * @dev: Device to handle. | |
972 | */ | |
4cf563c5 | 973 | void acpi_subsys_complete(struct device *dev) |
f25c0ae2 | 974 | { |
3d56402d | 975 | pm_generic_complete(dev); |
f25c0ae2 RW |
976 | /* |
977 | * If the device had been runtime-suspended before the system went into | |
978 | * the sleep state it is going out of and it has never been resumed till | |
979 | * now, resume it in case the firmware powered it up. | |
980 | */ | |
981 | if (dev->power.direct_complete) | |
982 | pm_request_resume(dev); | |
983 | } | |
4cf563c5 | 984 | EXPORT_SYMBOL_GPL(acpi_subsys_complete); |
f25c0ae2 | 985 | |
92858c47 RW |
986 | /** |
987 | * acpi_subsys_suspend - Run the device driver's suspend callback. | |
988 | * @dev: Device to handle. | |
989 | * | |
990 | * Follow PCI and resume devices suspended at run time before running their | |
991 | * system suspend callbacks. | |
992 | */ | |
993 | int acpi_subsys_suspend(struct device *dev) | |
994 | { | |
995 | pm_runtime_resume(dev); | |
996 | return pm_generic_suspend(dev); | |
997 | } | |
4cf563c5 | 998 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend); |
92858c47 | 999 | |
e5cc8ef3 RW |
1000 | /** |
1001 | * acpi_subsys_suspend_late - Suspend device using ACPI. | |
1002 | * @dev: Device to suspend. | |
1003 | * | |
1004 | * Carry out the generic late suspend procedure for @dev and use ACPI to put | |
1005 | * it into a low-power state during system transition into a sleep state. | |
1006 | */ | |
1007 | int acpi_subsys_suspend_late(struct device *dev) | |
1008 | { | |
1009 | int ret = pm_generic_suspend_late(dev); | |
1010 | return ret ? ret : acpi_dev_suspend_late(dev); | |
1011 | } | |
1012 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); | |
1013 | ||
1014 | /** | |
1015 | * acpi_subsys_resume_early - Resume device using ACPI. | |
1016 | * @dev: Device to Resume. | |
1017 | * | |
1018 | * Use ACPI to put the given device into the full-power state and carry out the | |
1019 | * generic early resume procedure for it during system transition into the | |
1020 | * working state. | |
1021 | */ | |
1022 | int acpi_subsys_resume_early(struct device *dev) | |
1023 | { | |
1024 | int ret = acpi_dev_resume_early(dev); | |
1025 | return ret ? ret : pm_generic_resume_early(dev); | |
1026 | } | |
1027 | EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); | |
92858c47 RW |
1028 | |
1029 | /** | |
1030 | * acpi_subsys_freeze - Run the device driver's freeze callback. | |
1031 | * @dev: Device to handle. | |
1032 | */ | |
1033 | int acpi_subsys_freeze(struct device *dev) | |
1034 | { | |
1035 | /* | |
1036 | * This used to be done in acpi_subsys_prepare() for all devices and | |
1037 | * some drivers may depend on it, so do it here. Ideally, however, | |
1038 | * runtime-suspended devices should not be touched during freeze/thaw | |
1039 | * transitions. | |
1040 | */ | |
1041 | pm_runtime_resume(dev); | |
1042 | return pm_generic_freeze(dev); | |
1043 | } | |
4cf563c5 | 1044 | EXPORT_SYMBOL_GPL(acpi_subsys_freeze); |
92858c47 | 1045 | |
e5cc8ef3 RW |
1046 | #endif /* CONFIG_PM_SLEEP */ |
1047 | ||
1048 | static struct dev_pm_domain acpi_general_pm_domain = { | |
1049 | .ops = { | |
e5cc8ef3 RW |
1050 | .runtime_suspend = acpi_subsys_runtime_suspend, |
1051 | .runtime_resume = acpi_subsys_runtime_resume, | |
e5cc8ef3 RW |
1052 | #ifdef CONFIG_PM_SLEEP |
1053 | .prepare = acpi_subsys_prepare, | |
f25c0ae2 | 1054 | .complete = acpi_subsys_complete, |
92858c47 | 1055 | .suspend = acpi_subsys_suspend, |
e5cc8ef3 RW |
1056 | .suspend_late = acpi_subsys_suspend_late, |
1057 | .resume_early = acpi_subsys_resume_early, | |
92858c47 RW |
1058 | .freeze = acpi_subsys_freeze, |
1059 | .poweroff = acpi_subsys_suspend, | |
e5cc8ef3 RW |
1060 | .poweroff_late = acpi_subsys_suspend_late, |
1061 | .restore_early = acpi_subsys_resume_early, | |
1062 | #endif | |
1063 | }, | |
1064 | }; | |
1065 | ||
91d66cd2 UH |
1066 | /** |
1067 | * acpi_dev_pm_detach - Remove ACPI power management from the device. | |
1068 | * @dev: Device to take care of. | |
1069 | * @power_off: Whether or not to try to remove power from the device. | |
1070 | * | |
1071 | * Remove the device from the general ACPI PM domain and remove its wakeup | |
1072 | * notifier. If @power_off is set, additionally remove power from the device if | |
1073 | * possible. | |
1074 | * | |
1075 | * Callers must ensure proper synchronization of this function with power | |
1076 | * management callbacks. | |
1077 | */ | |
1078 | static void acpi_dev_pm_detach(struct device *dev, bool power_off) | |
1079 | { | |
1080 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1081 | ||
1082 | if (adev && dev->pm_domain == &acpi_general_pm_domain) { | |
1083 | dev->pm_domain = NULL; | |
1084 | acpi_remove_pm_notifier(adev); | |
1085 | if (power_off) { | |
1086 | /* | |
1087 | * If the device's PM QoS resume latency limit or flags | |
1088 | * have been exposed to user space, they have to be | |
1089 | * hidden at this point, so that they don't affect the | |
1090 | * choice of the low-power state to put the device into. | |
1091 | */ | |
1092 | dev_pm_qos_hide_latency_limit(dev); | |
1093 | dev_pm_qos_hide_flags(dev); | |
1094 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); | |
1095 | acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
1096 | } | |
1097 | } | |
1098 | } | |
1099 | ||
e5cc8ef3 RW |
1100 | /** |
1101 | * acpi_dev_pm_attach - Prepare device for ACPI power management. | |
1102 | * @dev: Device to prepare. | |
b88ce2a4 | 1103 | * @power_on: Whether or not to power on the device. |
e5cc8ef3 RW |
1104 | * |
1105 | * If @dev has a valid ACPI handle that has a valid struct acpi_device object | |
1106 | * attached to it, install a wakeup notification handler for the device and | |
b88ce2a4 RW |
1107 | * add it to the general ACPI PM domain. If @power_on is set, the device will |
1108 | * be put into the ACPI D0 state before the function returns. | |
e5cc8ef3 RW |
1109 | * |
1110 | * This assumes that the @dev's bus type uses generic power management callbacks | |
1111 | * (or doesn't use any power management callbacks at all). | |
1112 | * | |
1113 | * Callers must ensure proper synchronization of this function with power | |
1114 | * management callbacks. | |
1115 | */ | |
b88ce2a4 | 1116 | int acpi_dev_pm_attach(struct device *dev, bool power_on) |
e5cc8ef3 | 1117 | { |
79c0373f | 1118 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
1119 | |
1120 | if (!adev) | |
1121 | return -ENODEV; | |
1122 | ||
1123 | if (dev->pm_domain) | |
1124 | return -EEXIST; | |
1125 | ||
c072530f | 1126 | acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); |
e5cc8ef3 | 1127 | dev->pm_domain = &acpi_general_pm_domain; |
b88ce2a4 RW |
1128 | if (power_on) { |
1129 | acpi_dev_pm_full_power(adev); | |
f35cec25 | 1130 | acpi_device_wakeup(adev, ACPI_STATE_S0, false); |
b88ce2a4 | 1131 | } |
86f1e15f UH |
1132 | |
1133 | dev->pm_domain->detach = acpi_dev_pm_detach; | |
e5cc8ef3 RW |
1134 | return 0; |
1135 | } | |
1136 | EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); | |
ec4602a9 | 1137 | #endif /* CONFIG_PM */ |