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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> |
33e4f80e | 27 | #include <linux/suspend.h> |
ec2cd81c | 28 | |
9ce4e607 RW |
29 | #include "internal.h" |
30 | ||
31 | #define _COMPONENT ACPI_POWER_COMPONENT | |
32 | ACPI_MODULE_NAME("device_pm"); | |
ec2cd81c | 33 | |
9ce4e607 RW |
34 | /** |
35 | * acpi_power_state_string - String representation of ACPI device power state. | |
36 | * @state: ACPI device power state to return the string representation of. | |
37 | */ | |
38 | const char *acpi_power_state_string(int state) | |
39 | { | |
40 | switch (state) { | |
41 | case ACPI_STATE_D0: | |
42 | return "D0"; | |
43 | case ACPI_STATE_D1: | |
44 | return "D1"; | |
45 | case ACPI_STATE_D2: | |
46 | return "D2"; | |
47 | case ACPI_STATE_D3_HOT: | |
48 | return "D3hot"; | |
49 | case ACPI_STATE_D3_COLD: | |
898fee4f | 50 | return "D3cold"; |
9ce4e607 RW |
51 | default: |
52 | return "(unknown)"; | |
53 | } | |
54 | } | |
55 | ||
56 | /** | |
57 | * acpi_device_get_power - Get power state of an ACPI device. | |
58 | * @device: Device to get the power state of. | |
59 | * @state: Place to store the power state of the device. | |
60 | * | |
61 | * This function does not update the device's power.state field, but it may | |
62 | * update its parent's power.state field (when the parent's power state is | |
63 | * unknown and the device's power state turns out to be D0). | |
64 | */ | |
65 | int acpi_device_get_power(struct acpi_device *device, int *state) | |
66 | { | |
67 | int result = ACPI_STATE_UNKNOWN; | |
68 | ||
69 | if (!device || !state) | |
70 | return -EINVAL; | |
71 | ||
72 | if (!device->flags.power_manageable) { | |
73 | /* TBD: Non-recursive algorithm for walking up hierarchy. */ | |
74 | *state = device->parent ? | |
75 | device->parent->power.state : ACPI_STATE_D0; | |
76 | goto out; | |
77 | } | |
78 | ||
79 | /* | |
75eb2d13 RW |
80 | * Get the device's power state from power resources settings and _PSC, |
81 | * if available. | |
9ce4e607 | 82 | */ |
75eb2d13 RW |
83 | if (device->power.flags.power_resources) { |
84 | int error = acpi_power_get_inferred_state(device, &result); | |
85 | if (error) | |
86 | return error; | |
87 | } | |
9ce4e607 | 88 | if (device->power.flags.explicit_get) { |
75eb2d13 | 89 | acpi_handle handle = device->handle; |
9ce4e607 | 90 | unsigned long long psc; |
75eb2d13 RW |
91 | acpi_status status; |
92 | ||
93 | status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc); | |
9ce4e607 RW |
94 | if (ACPI_FAILURE(status)) |
95 | return -ENODEV; | |
96 | ||
75eb2d13 RW |
97 | /* |
98 | * The power resources settings may indicate a power state | |
20dacb71 RW |
99 | * shallower than the actual power state of the device, because |
100 | * the same power resources may be referenced by other devices. | |
75eb2d13 | 101 | * |
20dacb71 RW |
102 | * For systems predating ACPI 4.0 we assume that D3hot is the |
103 | * deepest state that can be supported. | |
75eb2d13 RW |
104 | */ |
105 | if (psc > result && psc < ACPI_STATE_D3_COLD) | |
106 | result = psc; | |
107 | else if (result == ACPI_STATE_UNKNOWN) | |
20dacb71 | 108 | result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc; |
9ce4e607 RW |
109 | } |
110 | ||
111 | /* | |
112 | * If we were unsure about the device parent's power state up to this | |
113 | * point, the fact that the device is in D0 implies that the parent has | |
644f17ad | 114 | * to be in D0 too, except if ignore_parent is set. |
9ce4e607 | 115 | */ |
644f17ad MW |
116 | if (!device->power.flags.ignore_parent && device->parent |
117 | && device->parent->power.state == ACPI_STATE_UNKNOWN | |
9ce4e607 RW |
118 | && result == ACPI_STATE_D0) |
119 | device->parent->power.state = ACPI_STATE_D0; | |
120 | ||
121 | *state = result; | |
122 | ||
123 | out: | |
124 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", | |
125 | device->pnp.bus_id, acpi_power_state_string(*state))); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
9c0f45e3 RW |
130 | static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
131 | { | |
132 | if (adev->power.states[state].flags.explicit_set) { | |
133 | char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; | |
134 | acpi_status status; | |
135 | ||
136 | status = acpi_evaluate_object(adev->handle, method, NULL, NULL); | |
137 | if (ACPI_FAILURE(status)) | |
138 | return -ENODEV; | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
9ce4e607 RW |
143 | /** |
144 | * acpi_device_set_power - Set power state of an ACPI device. | |
145 | * @device: Device to set the power state of. | |
146 | * @state: New power state to set. | |
147 | * | |
148 | * Callers must ensure that the device is power manageable before using this | |
149 | * function. | |
150 | */ | |
151 | int acpi_device_set_power(struct acpi_device *device, int state) | |
152 | { | |
20dacb71 | 153 | int target_state = state; |
9ce4e607 | 154 | int result = 0; |
9ce4e607 | 155 | |
2c7d132a RW |
156 | if (!device || !device->flags.power_manageable |
157 | || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) | |
9ce4e607 RW |
158 | return -EINVAL; |
159 | ||
160 | /* Make sure this is a valid target state */ | |
161 | ||
162 | if (state == device->power.state) { | |
b69137a7 RW |
163 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", |
164 | device->pnp.bus_id, | |
9ce4e607 RW |
165 | acpi_power_state_string(state))); |
166 | return 0; | |
167 | } | |
168 | ||
20dacb71 RW |
169 | if (state == ACPI_STATE_D3_COLD) { |
170 | /* | |
171 | * For transitions to D3cold we need to execute _PS3 and then | |
172 | * possibly drop references to the power resources in use. | |
173 | */ | |
174 | state = ACPI_STATE_D3_HOT; | |
175 | /* If _PR3 is not available, use D3hot as the target state. */ | |
176 | if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) | |
177 | target_state = state; | |
178 | } else if (!device->power.states[state].flags.valid) { | |
b69137a7 RW |
179 | dev_warn(&device->dev, "Power state %s not supported\n", |
180 | acpi_power_state_string(state)); | |
9ce4e607 RW |
181 | return -ENODEV; |
182 | } | |
20dacb71 | 183 | |
644f17ad MW |
184 | if (!device->power.flags.ignore_parent && |
185 | device->parent && (state < device->parent->power.state)) { | |
b69137a7 | 186 | dev_warn(&device->dev, |
593298e6 AL |
187 | "Cannot transition to power state %s for parent in %s\n", |
188 | acpi_power_state_string(state), | |
189 | acpi_power_state_string(device->parent->power.state)); | |
9ce4e607 RW |
190 | return -ENODEV; |
191 | } | |
192 | ||
9ce4e607 RW |
193 | /* |
194 | * Transition Power | |
195 | * ---------------- | |
20dacb71 RW |
196 | * In accordance with ACPI 6, _PSx is executed before manipulating power |
197 | * resources, unless the target state is D0, in which case _PS0 is | |
198 | * supposed to be executed after turning the power resources on. | |
9ce4e607 | 199 | */ |
20dacb71 RW |
200 | if (state > ACPI_STATE_D0) { |
201 | /* | |
202 | * According to ACPI 6, devices cannot go from lower-power | |
203 | * (deeper) states to higher-power (shallower) states. | |
204 | */ | |
205 | if (state < device->power.state) { | |
206 | dev_warn(&device->dev, "Cannot transition from %s to %s\n", | |
207 | acpi_power_state_string(device->power.state), | |
208 | acpi_power_state_string(state)); | |
209 | return -ENODEV; | |
210 | } | |
211 | ||
212 | result = acpi_dev_pm_explicit_set(device, state); | |
9c0f45e3 RW |
213 | if (result) |
214 | goto end; | |
9ce4e607 | 215 | |
20dacb71 RW |
216 | if (device->power.flags.power_resources) |
217 | result = acpi_power_transition(device, target_state); | |
218 | } else { | |
219 | if (device->power.flags.power_resources) { | |
220 | result = acpi_power_transition(device, ACPI_STATE_D0); | |
221 | if (result) | |
222 | goto end; | |
223 | } | |
224 | result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
e5656271 | 225 | } |
9ce4e607 | 226 | |
e78adb75 RW |
227 | end: |
228 | if (result) { | |
b69137a7 RW |
229 | dev_warn(&device->dev, "Failed to change power state to %s\n", |
230 | acpi_power_state_string(state)); | |
e78adb75 | 231 | } else { |
71b65445 | 232 | device->power.state = target_state; |
9ce4e607 RW |
233 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
234 | "Device [%s] transitioned to %s\n", | |
235 | device->pnp.bus_id, | |
236 | acpi_power_state_string(state))); | |
237 | } | |
238 | ||
239 | return result; | |
240 | } | |
241 | EXPORT_SYMBOL(acpi_device_set_power); | |
242 | ||
243 | int acpi_bus_set_power(acpi_handle handle, int state) | |
244 | { | |
245 | struct acpi_device *device; | |
246 | int result; | |
247 | ||
248 | result = acpi_bus_get_device(handle, &device); | |
249 | if (result) | |
250 | return result; | |
251 | ||
9ce4e607 RW |
252 | return acpi_device_set_power(device, state); |
253 | } | |
254 | EXPORT_SYMBOL(acpi_bus_set_power); | |
255 | ||
256 | int acpi_bus_init_power(struct acpi_device *device) | |
257 | { | |
258 | int state; | |
259 | int result; | |
260 | ||
261 | if (!device) | |
262 | return -EINVAL; | |
263 | ||
264 | device->power.state = ACPI_STATE_UNKNOWN; | |
cde1f95f SA |
265 | if (!acpi_device_is_present(device)) { |
266 | device->flags.initialized = false; | |
1b1f3e16 | 267 | return -ENXIO; |
cde1f95f | 268 | } |
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 | } | |
78a898d0 | 325 | EXPORT_SYMBOL_GPL(acpi_device_fix_up_power); |
b9e95fc6 | 326 | |
202317a5 | 327 | int acpi_device_update_power(struct acpi_device *device, int *state_p) |
9ce4e607 | 328 | { |
9ce4e607 RW |
329 | int state; |
330 | int result; | |
331 | ||
202317a5 RW |
332 | if (device->power.state == ACPI_STATE_UNKNOWN) { |
333 | result = acpi_bus_init_power(device); | |
334 | if (!result && state_p) | |
335 | *state_p = device->power.state; | |
336 | ||
9ce4e607 | 337 | return result; |
202317a5 | 338 | } |
9ce4e607 RW |
339 | |
340 | result = acpi_device_get_power(device, &state); | |
341 | if (result) | |
342 | return result; | |
343 | ||
91bdad0b | 344 | if (state == ACPI_STATE_UNKNOWN) { |
511d5c42 | 345 | state = ACPI_STATE_D0; |
91bdad0b RW |
346 | result = acpi_device_set_power(device, state); |
347 | if (result) | |
348 | return result; | |
349 | } else { | |
350 | if (device->power.flags.power_resources) { | |
351 | /* | |
352 | * We don't need to really switch the state, bu we need | |
353 | * to update the power resources' reference counters. | |
354 | */ | |
355 | result = acpi_power_transition(device, state); | |
356 | if (result) | |
357 | return result; | |
358 | } | |
359 | device->power.state = state; | |
360 | } | |
361 | if (state_p) | |
9ce4e607 RW |
362 | *state_p = state; |
363 | ||
91bdad0b | 364 | return 0; |
9ce4e607 | 365 | } |
2bb3a2bf | 366 | EXPORT_SYMBOL_GPL(acpi_device_update_power); |
202317a5 RW |
367 | |
368 | int acpi_bus_update_power(acpi_handle handle, int *state_p) | |
369 | { | |
370 | struct acpi_device *device; | |
371 | int result; | |
372 | ||
373 | result = acpi_bus_get_device(handle, &device); | |
374 | return result ? result : acpi_device_update_power(device, state_p); | |
375 | } | |
9ce4e607 RW |
376 | EXPORT_SYMBOL_GPL(acpi_bus_update_power); |
377 | ||
378 | bool acpi_bus_power_manageable(acpi_handle handle) | |
379 | { | |
380 | struct acpi_device *device; | |
381 | int result; | |
382 | ||
383 | result = acpi_bus_get_device(handle, &device); | |
384 | return result ? false : device->flags.power_manageable; | |
385 | } | |
386 | EXPORT_SYMBOL(acpi_bus_power_manageable); | |
387 | ||
ec4602a9 RW |
388 | #ifdef CONFIG_PM |
389 | static DEFINE_MUTEX(acpi_pm_notifier_lock); | |
390 | ||
33e4f80e RW |
391 | void acpi_pm_wakeup_event(struct device *dev) |
392 | { | |
393 | pm_wakeup_dev_event(dev, 0, acpi_s2idle_wakeup()); | |
394 | } | |
395 | EXPORT_SYMBOL_GPL(acpi_pm_wakeup_event); | |
396 | ||
c072530f RW |
397 | static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) |
398 | { | |
399 | struct acpi_device *adev; | |
400 | ||
401 | if (val != ACPI_NOTIFY_DEVICE_WAKE) | |
402 | return; | |
403 | ||
020a6375 RW |
404 | acpi_handle_debug(handle, "Wake notify\n"); |
405 | ||
c072530f RW |
406 | adev = acpi_bus_get_acpi_device(handle); |
407 | if (!adev) | |
408 | return; | |
409 | ||
410 | mutex_lock(&acpi_pm_notifier_lock); | |
411 | ||
412 | if (adev->wakeup.flags.notifier_present) { | |
33e4f80e | 413 | pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup()); |
020a6375 RW |
414 | if (adev->wakeup.context.func) { |
415 | acpi_handle_debug(handle, "Running %pF for %s\n", | |
416 | adev->wakeup.context.func, | |
417 | dev_name(adev->wakeup.context.dev)); | |
64fd1c70 | 418 | adev->wakeup.context.func(&adev->wakeup.context); |
020a6375 | 419 | } |
c072530f RW |
420 | } |
421 | ||
422 | mutex_unlock(&acpi_pm_notifier_lock); | |
423 | ||
424 | acpi_bus_put_acpi_device(adev); | |
425 | } | |
426 | ||
ec4602a9 | 427 | /** |
c072530f RW |
428 | * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. |
429 | * @adev: ACPI device to add the notify handler for. | |
430 | * @dev: Device to generate a wakeup event for while handling the notification. | |
64fd1c70 | 431 | * @func: Work function to execute when handling the notification. |
ec4602a9 RW |
432 | * |
433 | * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of | |
434 | * PM wakeup events. For example, wakeup events may be generated for bridges | |
435 | * if one of the devices below the bridge is signaling wakeup, even if the | |
436 | * bridge itself doesn't have a wakeup GPE associated with it. | |
437 | */ | |
c072530f | 438 | acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, |
64fd1c70 | 439 | void (*func)(struct acpi_device_wakeup_context *context)) |
ec4602a9 RW |
440 | { |
441 | acpi_status status = AE_ALREADY_EXISTS; | |
442 | ||
64fd1c70 | 443 | if (!dev && !func) |
c072530f RW |
444 | return AE_BAD_PARAMETER; |
445 | ||
ec4602a9 RW |
446 | mutex_lock(&acpi_pm_notifier_lock); |
447 | ||
448 | if (adev->wakeup.flags.notifier_present) | |
449 | goto out; | |
450 | ||
c072530f RW |
451 | adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev)); |
452 | adev->wakeup.context.dev = dev; | |
64fd1c70 | 453 | adev->wakeup.context.func = func; |
c072530f RW |
454 | |
455 | status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, | |
456 | acpi_pm_notify_handler, NULL); | |
ec4602a9 RW |
457 | if (ACPI_FAILURE(status)) |
458 | goto out; | |
459 | ||
460 | adev->wakeup.flags.notifier_present = true; | |
461 | ||
462 | out: | |
463 | mutex_unlock(&acpi_pm_notifier_lock); | |
464 | return status; | |
465 | } | |
466 | ||
467 | /** | |
468 | * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
469 | * @adev: ACPI device to remove the notifier from. | |
470 | */ | |
c072530f | 471 | acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) |
ec4602a9 RW |
472 | { |
473 | acpi_status status = AE_BAD_PARAMETER; | |
474 | ||
475 | mutex_lock(&acpi_pm_notifier_lock); | |
476 | ||
477 | if (!adev->wakeup.flags.notifier_present) | |
478 | goto out; | |
479 | ||
480 | status = acpi_remove_notify_handler(adev->handle, | |
481 | ACPI_SYSTEM_NOTIFY, | |
c072530f | 482 | acpi_pm_notify_handler); |
ec4602a9 RW |
483 | if (ACPI_FAILURE(status)) |
484 | goto out; | |
485 | ||
64fd1c70 | 486 | adev->wakeup.context.func = NULL; |
c072530f RW |
487 | adev->wakeup.context.dev = NULL; |
488 | wakeup_source_unregister(adev->wakeup.ws); | |
489 | ||
ec4602a9 RW |
490 | adev->wakeup.flags.notifier_present = false; |
491 | ||
492 | out: | |
493 | mutex_unlock(&acpi_pm_notifier_lock); | |
494 | return status; | |
495 | } | |
496 | ||
9ce4e607 RW |
497 | bool acpi_bus_can_wakeup(acpi_handle handle) |
498 | { | |
499 | struct acpi_device *device; | |
500 | int result; | |
501 | ||
502 | result = acpi_bus_get_device(handle, &device); | |
503 | return result ? false : device->wakeup.flags.valid; | |
504 | } | |
505 | EXPORT_SYMBOL(acpi_bus_can_wakeup); | |
506 | ||
8370c2dc RW |
507 | bool acpi_pm_device_can_wakeup(struct device *dev) |
508 | { | |
509 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
510 | ||
511 | return adev ? acpi_device_can_wakeup(adev) : false; | |
512 | } | |
513 | ||
86b3832c | 514 | /** |
b25c77ef | 515 | * acpi_dev_pm_get_state - Get preferred power state of ACPI device. |
86b3832c RW |
516 | * @dev: Device whose preferred target power state to return. |
517 | * @adev: ACPI device node corresponding to @dev. | |
518 | * @target_state: System state to match the resultant device state. | |
fa1675b5 RW |
519 | * @d_min_p: Location to store the highest power state available to the device. |
520 | * @d_max_p: Location to store the lowest power state available to the device. | |
86b3832c | 521 | * |
fa1675b5 RW |
522 | * Find the lowest power (highest number) and highest power (lowest number) ACPI |
523 | * device power states that the device can be in while the system is in the | |
524 | * state represented by @target_state. Store the integer numbers representing | |
525 | * those stats in the memory locations pointed to by @d_max_p and @d_min_p, | |
526 | * respectively. | |
86b3832c RW |
527 | * |
528 | * Callers must ensure that @dev and @adev are valid pointers and that @adev | |
529 | * actually corresponds to @dev before using this function. | |
fa1675b5 RW |
530 | * |
531 | * Returns 0 on success or -ENODATA when one of the ACPI methods fails or | |
532 | * returns a value that doesn't make sense. The memory locations pointed to by | |
533 | * @d_max_p and @d_min_p are only modified on success. | |
86b3832c | 534 | */ |
b25c77ef | 535 | static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, |
fa1675b5 | 536 | u32 target_state, int *d_min_p, int *d_max_p) |
86b3832c | 537 | { |
fa1675b5 RW |
538 | char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; |
539 | acpi_handle handle = adev->handle; | |
540 | unsigned long long ret; | |
541 | int d_min, d_max; | |
86b3832c | 542 | bool wakeup = false; |
fa1675b5 | 543 | acpi_status status; |
86b3832c | 544 | |
86b3832c | 545 | /* |
fa1675b5 RW |
546 | * If the system state is S0, the lowest power state the device can be |
547 | * in is D3cold, unless the device has _S0W and is supposed to signal | |
548 | * wakeup, in which case the return value of _S0W has to be used as the | |
549 | * lowest power state available to the device. | |
86b3832c RW |
550 | */ |
551 | d_min = ACPI_STATE_D0; | |
4c164ae7 | 552 | d_max = ACPI_STATE_D3_COLD; |
86b3832c RW |
553 | |
554 | /* | |
555 | * If present, _SxD methods return the minimum D-state (highest power | |
556 | * state) we can use for the corresponding S-states. Otherwise, the | |
557 | * minimum D-state is D0 (ACPI 3.x). | |
86b3832c RW |
558 | */ |
559 | if (target_state > ACPI_STATE_S0) { | |
fa1675b5 RW |
560 | /* |
561 | * We rely on acpi_evaluate_integer() not clobbering the integer | |
562 | * provided if AE_NOT_FOUND is returned. | |
563 | */ | |
564 | ret = d_min; | |
565 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
566 | if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) | |
567 | || ret > ACPI_STATE_D3_COLD) | |
568 | return -ENODATA; | |
569 | ||
570 | /* | |
571 | * We need to handle legacy systems where D3hot and D3cold are | |
572 | * the same and 3 is returned in both cases, so fall back to | |
573 | * D3cold if D3hot is not a valid state. | |
574 | */ | |
575 | if (!adev->power.states[ret].flags.valid) { | |
576 | if (ret == ACPI_STATE_D3_HOT) | |
577 | ret = ACPI_STATE_D3_COLD; | |
578 | else | |
579 | return -ENODATA; | |
580 | } | |
581 | d_min = ret; | |
86b3832c RW |
582 | wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid |
583 | && adev->wakeup.sleep_state >= target_state; | |
584 | } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != | |
585 | PM_QOS_FLAGS_NONE) { | |
586 | wakeup = adev->wakeup.flags.valid; | |
587 | } | |
588 | ||
589 | /* | |
590 | * If _PRW says we can wake up the system from the target sleep state, | |
591 | * the D-state returned by _SxD is sufficient for that (we assume a | |
592 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
593 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
594 | * can wake the system. _S0W may be valid, too. | |
595 | */ | |
596 | if (wakeup) { | |
fa1675b5 RW |
597 | method[3] = 'W'; |
598 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
599 | if (status == AE_NOT_FOUND) { | |
600 | if (target_state > ACPI_STATE_S0) | |
86b3832c | 601 | d_max = d_min; |
fa1675b5 RW |
602 | } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { |
603 | /* Fall back to D3cold if ret is not a valid state. */ | |
604 | if (!adev->power.states[ret].flags.valid) | |
605 | ret = ACPI_STATE_D3_COLD; | |
606 | ||
607 | d_max = ret > d_min ? ret : d_min; | |
608 | } else { | |
609 | return -ENODATA; | |
86b3832c RW |
610 | } |
611 | } | |
612 | ||
86b3832c RW |
613 | if (d_min_p) |
614 | *d_min_p = d_min; | |
fa1675b5 RW |
615 | |
616 | if (d_max_p) | |
617 | *d_max_p = d_max; | |
618 | ||
619 | return 0; | |
86b3832c | 620 | } |
cd7bd02d | 621 | |
a6ae7594 RW |
622 | /** |
623 | * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. | |
624 | * @dev: Device whose preferred target power state to return. | |
625 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
626 | * @d_max_in: Deepest low-power state to take into consideration. | |
627 | * Return value: Preferred power state of the device on success, -ENODEV | |
fa1675b5 RW |
628 | * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is |
629 | * incorrect, or -ENODATA on ACPI method failure. | |
a6ae7594 RW |
630 | * |
631 | * The caller must ensure that @dev is valid before using this function. | |
632 | */ | |
633 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) | |
634 | { | |
a6ae7594 | 635 | struct acpi_device *adev; |
9b5c7a5a | 636 | int ret, d_min, d_max; |
fa1675b5 RW |
637 | |
638 | if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) | |
639 | return -EINVAL; | |
640 | ||
20dacb71 | 641 | if (d_max_in > ACPI_STATE_D2) { |
fa1675b5 RW |
642 | enum pm_qos_flags_status stat; |
643 | ||
644 | stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); | |
645 | if (stat == PM_QOS_FLAGS_ALL) | |
20dacb71 | 646 | d_max_in = ACPI_STATE_D2; |
fa1675b5 | 647 | } |
a6ae7594 | 648 | |
17653a3e RW |
649 | adev = ACPI_COMPANION(dev); |
650 | if (!adev) { | |
651 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
652 | return -ENODEV; |
653 | } | |
654 | ||
fa1675b5 | 655 | ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), |
9b5c7a5a | 656 | &d_min, &d_max); |
fa1675b5 RW |
657 | if (ret) |
658 | return ret; | |
659 | ||
9b5c7a5a | 660 | if (d_max_in < d_min) |
fa1675b5 RW |
661 | return -EINVAL; |
662 | ||
663 | if (d_max > d_max_in) { | |
9b5c7a5a | 664 | for (d_max = d_max_in; d_max > d_min; d_max--) { |
fa1675b5 RW |
665 | if (adev->power.states[d_max].flags.valid) |
666 | break; | |
667 | } | |
668 | } | |
9b5c7a5a RW |
669 | |
670 | if (d_min_p) | |
671 | *d_min_p = d_min; | |
672 | ||
fa1675b5 | 673 | return d_max; |
a6ae7594 RW |
674 | } |
675 | EXPORT_SYMBOL(acpi_pm_device_sleep_state); | |
676 | ||
e5cc8ef3 | 677 | /** |
c072530f | 678 | * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. |
64fd1c70 | 679 | * @context: Device wakeup context. |
e5cc8ef3 | 680 | */ |
64fd1c70 | 681 | static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context) |
e5cc8ef3 | 682 | { |
64fd1c70 | 683 | struct device *dev = context->dev; |
e5cc8ef3 | 684 | |
c072530f | 685 | if (dev) { |
e5cc8ef3 | 686 | pm_wakeup_event(dev, 0); |
64fd1c70 | 687 | pm_request_resume(dev); |
e5cc8ef3 RW |
688 | } |
689 | } | |
690 | ||
99d8845e RW |
691 | static DEFINE_MUTEX(acpi_wakeup_lock); |
692 | ||
1ba51a7c RW |
693 | static int __acpi_device_wakeup_enable(struct acpi_device *adev, |
694 | u32 target_state, int max_count) | |
dee8370c RW |
695 | { |
696 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
99d8845e RW |
697 | acpi_status status; |
698 | int error = 0; | |
dee8370c | 699 | |
99d8845e | 700 | mutex_lock(&acpi_wakeup_lock); |
dee8370c | 701 | |
1ba51a7c | 702 | if (wakeup->enable_count >= max_count) |
99d8845e | 703 | goto out; |
235d81a6 | 704 | |
1ba51a7c RW |
705 | if (wakeup->enable_count > 0) |
706 | goto inc; | |
707 | ||
99d8845e RW |
708 | error = acpi_enable_wakeup_device_power(adev, target_state); |
709 | if (error) | |
710 | goto out; | |
dee8370c | 711 | |
99d8845e RW |
712 | status = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
713 | if (ACPI_FAILURE(status)) { | |
dee8370c | 714 | acpi_disable_wakeup_device_power(adev); |
99d8845e RW |
715 | error = -EIO; |
716 | goto out; | |
dee8370c | 717 | } |
99d8845e | 718 | |
1ba51a7c | 719 | inc: |
99d8845e RW |
720 | wakeup->enable_count++; |
721 | ||
722 | out: | |
723 | mutex_unlock(&acpi_wakeup_lock); | |
724 | return error; | |
725 | } | |
726 | ||
1ba51a7c RW |
727 | /** |
728 | * acpi_device_wakeup_enable - Enable wakeup functionality for device. | |
729 | * @adev: ACPI device to enable wakeup functionality for. | |
730 | * @target_state: State the system is transitioning into. | |
731 | * | |
732 | * Enable the GPE associated with @adev so that it can generate wakeup signals | |
733 | * for the device in response to external (remote) events and enable wakeup | |
734 | * power for it. | |
735 | * | |
736 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
737 | * this function. | |
738 | */ | |
739 | static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state) | |
740 | { | |
741 | return __acpi_device_wakeup_enable(adev, target_state, 1); | |
742 | } | |
743 | ||
99d8845e RW |
744 | /** |
745 | * acpi_device_wakeup_disable - Disable wakeup functionality for device. | |
746 | * @adev: ACPI device to disable wakeup functionality for. | |
747 | * | |
748 | * Disable the GPE associated with @adev and disable wakeup power for it. | |
749 | * | |
750 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
751 | * this function. | |
752 | */ | |
753 | static void acpi_device_wakeup_disable(struct acpi_device *adev) | |
754 | { | |
755 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
756 | ||
757 | mutex_lock(&acpi_wakeup_lock); | |
758 | ||
759 | if (!wakeup->enable_count) | |
760 | goto out; | |
761 | ||
762 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
763 | acpi_disable_wakeup_device_power(adev); | |
764 | ||
765 | wakeup->enable_count--; | |
766 | ||
767 | out: | |
768 | mutex_unlock(&acpi_wakeup_lock); | |
dee8370c RW |
769 | } |
770 | ||
1ba51a7c RW |
771 | static int __acpi_pm_set_device_wakeup(struct device *dev, bool enable, |
772 | int max_count) | |
a6ae7594 | 773 | { |
a6ae7594 RW |
774 | struct acpi_device *adev; |
775 | int error; | |
776 | ||
17653a3e RW |
777 | adev = ACPI_COMPANION(dev); |
778 | if (!adev) { | |
779 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
780 | return -ENODEV; |
781 | } | |
782 | ||
4d183d04 RW |
783 | if (!acpi_device_can_wakeup(adev)) |
784 | return -EINVAL; | |
785 | ||
99d8845e RW |
786 | if (!enable) { |
787 | acpi_device_wakeup_disable(adev); | |
788 | dev_dbg(dev, "Wakeup disabled by ACPI\n"); | |
789 | return 0; | |
790 | } | |
791 | ||
1ba51a7c RW |
792 | error = __acpi_device_wakeup_enable(adev, acpi_target_system_state(), |
793 | max_count); | |
a6ae7594 | 794 | if (!error) |
99d8845e | 795 | dev_dbg(dev, "Wakeup enabled by ACPI\n"); |
a6ae7594 RW |
796 | |
797 | return error; | |
798 | } | |
1ba51a7c RW |
799 | |
800 | /** | |
801 | * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device. | |
802 | * @dev: Device to enable/disable to generate wakeup events. | |
803 | * @enable: Whether to enable or disable the wakeup functionality. | |
804 | */ | |
805 | int acpi_pm_set_device_wakeup(struct device *dev, bool enable) | |
806 | { | |
807 | return __acpi_pm_set_device_wakeup(dev, enable, 1); | |
808 | } | |
809 | EXPORT_SYMBOL_GPL(acpi_pm_set_device_wakeup); | |
810 | ||
811 | /** | |
812 | * acpi_pm_set_bridge_wakeup - Enable/disable remote wakeup for given bridge. | |
813 | * @dev: Bridge device to enable/disable to generate wakeup events. | |
814 | * @enable: Whether to enable or disable the wakeup functionality. | |
815 | */ | |
816 | int acpi_pm_set_bridge_wakeup(struct device *dev, bool enable) | |
817 | { | |
818 | return __acpi_pm_set_device_wakeup(dev, enable, INT_MAX); | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(acpi_pm_set_bridge_wakeup); | |
e5cc8ef3 | 821 | |
e5cc8ef3 RW |
822 | /** |
823 | * acpi_dev_pm_low_power - Put ACPI device into a low-power state. | |
824 | * @dev: Device to put into a low-power state. | |
825 | * @adev: ACPI device node corresponding to @dev. | |
826 | * @system_state: System state to choose the device state for. | |
827 | */ | |
828 | static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, | |
829 | u32 system_state) | |
830 | { | |
fa1675b5 | 831 | int ret, state; |
e5cc8ef3 RW |
832 | |
833 | if (!acpi_device_power_manageable(adev)) | |
834 | return 0; | |
835 | ||
fa1675b5 RW |
836 | ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); |
837 | return ret ? ret : acpi_device_set_power(adev, state); | |
e5cc8ef3 RW |
838 | } |
839 | ||
840 | /** | |
841 | * acpi_dev_pm_full_power - Put ACPI device into the full-power state. | |
842 | * @adev: ACPI device node to put into the full-power state. | |
843 | */ | |
844 | static int acpi_dev_pm_full_power(struct acpi_device *adev) | |
845 | { | |
846 | return acpi_device_power_manageable(adev) ? | |
847 | acpi_device_set_power(adev, ACPI_STATE_D0) : 0; | |
848 | } | |
849 | ||
e5cc8ef3 RW |
850 | /** |
851 | * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. | |
852 | * @dev: Device to put into a low-power state. | |
853 | * | |
854 | * Put the given device into a runtime low-power state using the standard ACPI | |
855 | * mechanism. Set up remote wakeup if desired, choose the state to put the | |
856 | * device into (this checks if remote wakeup is expected to work too), and set | |
857 | * the power state of the device. | |
858 | */ | |
859 | int acpi_dev_runtime_suspend(struct device *dev) | |
860 | { | |
79c0373f | 861 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
862 | bool remote_wakeup; |
863 | int error; | |
864 | ||
865 | if (!adev) | |
866 | return 0; | |
867 | ||
868 | remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > | |
869 | PM_QOS_FLAGS_NONE; | |
99d8845e RW |
870 | if (remote_wakeup) { |
871 | error = acpi_device_wakeup_enable(adev, ACPI_STATE_S0); | |
872 | if (error) | |
873 | return -EAGAIN; | |
874 | } | |
e5cc8ef3 RW |
875 | |
876 | error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
99d8845e RW |
877 | if (error && remote_wakeup) |
878 | acpi_device_wakeup_disable(adev); | |
e5cc8ef3 RW |
879 | |
880 | return error; | |
881 | } | |
882 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); | |
883 | ||
884 | /** | |
63705c40 | 885 | * acpi_dev_resume - Put device into the full-power state using ACPI. |
e5cc8ef3 RW |
886 | * @dev: Device to put into the full-power state. |
887 | * | |
888 | * Put the given device into the full-power state using the standard ACPI | |
63705c40 | 889 | * mechanism. Set the power state of the device to ACPI D0 and disable wakeup. |
e5cc8ef3 | 890 | */ |
63705c40 | 891 | int acpi_dev_resume(struct device *dev) |
e5cc8ef3 | 892 | { |
79c0373f | 893 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
894 | int error; |
895 | ||
896 | if (!adev) | |
897 | return 0; | |
898 | ||
899 | error = acpi_dev_pm_full_power(adev); | |
99d8845e | 900 | acpi_device_wakeup_disable(adev); |
e5cc8ef3 RW |
901 | return error; |
902 | } | |
63705c40 | 903 | EXPORT_SYMBOL_GPL(acpi_dev_resume); |
e5cc8ef3 RW |
904 | |
905 | /** | |
906 | * acpi_subsys_runtime_suspend - Suspend device using ACPI. | |
907 | * @dev: Device to suspend. | |
908 | * | |
909 | * Carry out the generic runtime suspend procedure for @dev and use ACPI to put | |
910 | * it into a runtime low-power state. | |
911 | */ | |
912 | int acpi_subsys_runtime_suspend(struct device *dev) | |
913 | { | |
914 | int ret = pm_generic_runtime_suspend(dev); | |
915 | return ret ? ret : acpi_dev_runtime_suspend(dev); | |
916 | } | |
917 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); | |
918 | ||
919 | /** | |
920 | * acpi_subsys_runtime_resume - Resume device using ACPI. | |
921 | * @dev: Device to Resume. | |
922 | * | |
923 | * Use ACPI to put the given device into the full-power state and carry out the | |
924 | * generic runtime resume procedure for it. | |
925 | */ | |
926 | int acpi_subsys_runtime_resume(struct device *dev) | |
927 | { | |
63705c40 | 928 | int ret = acpi_dev_resume(dev); |
e5cc8ef3 RW |
929 | return ret ? ret : pm_generic_runtime_resume(dev); |
930 | } | |
931 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); | |
e5cc8ef3 RW |
932 | |
933 | #ifdef CONFIG_PM_SLEEP | |
934 | /** | |
935 | * acpi_dev_suspend_late - Put device into a low-power state using ACPI. | |
936 | * @dev: Device to put into a low-power state. | |
937 | * | |
938 | * Put the given device into a low-power state during system transition to a | |
939 | * sleep state using the standard ACPI mechanism. Set up system wakeup if | |
940 | * desired, choose the state to put the device into (this checks if system | |
941 | * wakeup is expected to work too), and set the power state of the device. | |
942 | */ | |
943 | int acpi_dev_suspend_late(struct device *dev) | |
944 | { | |
79c0373f | 945 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
946 | u32 target_state; |
947 | bool wakeup; | |
948 | int error; | |
949 | ||
950 | if (!adev) | |
951 | return 0; | |
952 | ||
953 | target_state = acpi_target_system_state(); | |
78579b7c | 954 | wakeup = device_may_wakeup(dev) && acpi_device_can_wakeup(adev); |
99d8845e RW |
955 | if (wakeup) { |
956 | error = acpi_device_wakeup_enable(adev, target_state); | |
957 | if (error) | |
958 | return error; | |
959 | } | |
e5cc8ef3 RW |
960 | |
961 | error = acpi_dev_pm_low_power(dev, adev, target_state); | |
99d8845e RW |
962 | if (error && wakeup) |
963 | acpi_device_wakeup_disable(adev); | |
e5cc8ef3 RW |
964 | |
965 | return error; | |
966 | } | |
967 | EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); | |
968 | ||
e5cc8ef3 RW |
969 | /** |
970 | * acpi_subsys_prepare - Prepare device for system transition to a sleep state. | |
971 | * @dev: Device to prepare. | |
972 | */ | |
973 | int acpi_subsys_prepare(struct device *dev) | |
974 | { | |
f25c0ae2 RW |
975 | struct acpi_device *adev = ACPI_COMPANION(dev); |
976 | u32 sys_target; | |
977 | int ret, state; | |
978 | ||
979 | ret = pm_generic_prepare(dev); | |
980 | if (ret < 0) | |
981 | return ret; | |
982 | ||
983 | if (!adev || !pm_runtime_suspended(dev) | |
984 | || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) | |
985 | return 0; | |
986 | ||
987 | sys_target = acpi_target_system_state(); | |
988 | if (sys_target == ACPI_STATE_S0) | |
989 | return 1; | |
92858c47 | 990 | |
f25c0ae2 RW |
991 | if (adev->power.flags.dsw_present) |
992 | return 0; | |
993 | ||
994 | ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); | |
995 | return !ret && state == adev->power.state; | |
e5cc8ef3 RW |
996 | } |
997 | EXPORT_SYMBOL_GPL(acpi_subsys_prepare); | |
998 | ||
92858c47 RW |
999 | /** |
1000 | * acpi_subsys_suspend - Run the device driver's suspend callback. | |
1001 | * @dev: Device to handle. | |
1002 | * | |
1003 | * Follow PCI and resume devices suspended at run time before running their | |
1004 | * system suspend callbacks. | |
1005 | */ | |
1006 | int acpi_subsys_suspend(struct device *dev) | |
1007 | { | |
1008 | pm_runtime_resume(dev); | |
1009 | return pm_generic_suspend(dev); | |
1010 | } | |
4cf563c5 | 1011 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend); |
92858c47 | 1012 | |
e5cc8ef3 RW |
1013 | /** |
1014 | * acpi_subsys_suspend_late - Suspend device using ACPI. | |
1015 | * @dev: Device to suspend. | |
1016 | * | |
1017 | * Carry out the generic late suspend procedure for @dev and use ACPI to put | |
1018 | * it into a low-power state during system transition into a sleep state. | |
1019 | */ | |
1020 | int acpi_subsys_suspend_late(struct device *dev) | |
1021 | { | |
1022 | int ret = pm_generic_suspend_late(dev); | |
1023 | return ret ? ret : acpi_dev_suspend_late(dev); | |
1024 | } | |
1025 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); | |
1026 | ||
1027 | /** | |
1028 | * acpi_subsys_resume_early - Resume device using ACPI. | |
1029 | * @dev: Device to Resume. | |
1030 | * | |
1031 | * Use ACPI to put the given device into the full-power state and carry out the | |
1032 | * generic early resume procedure for it during system transition into the | |
1033 | * working state. | |
1034 | */ | |
1035 | int acpi_subsys_resume_early(struct device *dev) | |
1036 | { | |
63705c40 | 1037 | int ret = acpi_dev_resume(dev); |
e5cc8ef3 RW |
1038 | return ret ? ret : pm_generic_resume_early(dev); |
1039 | } | |
1040 | EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); | |
92858c47 RW |
1041 | |
1042 | /** | |
1043 | * acpi_subsys_freeze - Run the device driver's freeze callback. | |
1044 | * @dev: Device to handle. | |
1045 | */ | |
1046 | int acpi_subsys_freeze(struct device *dev) | |
1047 | { | |
1048 | /* | |
1049 | * This used to be done in acpi_subsys_prepare() for all devices and | |
1050 | * some drivers may depend on it, so do it here. Ideally, however, | |
1051 | * runtime-suspended devices should not be touched during freeze/thaw | |
1052 | * transitions. | |
1053 | */ | |
1054 | pm_runtime_resume(dev); | |
1055 | return pm_generic_freeze(dev); | |
1056 | } | |
4cf563c5 | 1057 | EXPORT_SYMBOL_GPL(acpi_subsys_freeze); |
92858c47 | 1058 | |
e5cc8ef3 RW |
1059 | #endif /* CONFIG_PM_SLEEP */ |
1060 | ||
1061 | static struct dev_pm_domain acpi_general_pm_domain = { | |
1062 | .ops = { | |
e5cc8ef3 RW |
1063 | .runtime_suspend = acpi_subsys_runtime_suspend, |
1064 | .runtime_resume = acpi_subsys_runtime_resume, | |
e5cc8ef3 RW |
1065 | #ifdef CONFIG_PM_SLEEP |
1066 | .prepare = acpi_subsys_prepare, | |
58a1fbbb | 1067 | .complete = pm_complete_with_resume_check, |
92858c47 | 1068 | .suspend = acpi_subsys_suspend, |
e5cc8ef3 RW |
1069 | .suspend_late = acpi_subsys_suspend_late, |
1070 | .resume_early = acpi_subsys_resume_early, | |
92858c47 RW |
1071 | .freeze = acpi_subsys_freeze, |
1072 | .poweroff = acpi_subsys_suspend, | |
e5cc8ef3 RW |
1073 | .poweroff_late = acpi_subsys_suspend_late, |
1074 | .restore_early = acpi_subsys_resume_early, | |
1075 | #endif | |
1076 | }, | |
1077 | }; | |
1078 | ||
91d66cd2 UH |
1079 | /** |
1080 | * acpi_dev_pm_detach - Remove ACPI power management from the device. | |
1081 | * @dev: Device to take care of. | |
1082 | * @power_off: Whether or not to try to remove power from the device. | |
1083 | * | |
1084 | * Remove the device from the general ACPI PM domain and remove its wakeup | |
1085 | * notifier. If @power_off is set, additionally remove power from the device if | |
1086 | * possible. | |
1087 | * | |
1088 | * Callers must ensure proper synchronization of this function with power | |
1089 | * management callbacks. | |
1090 | */ | |
1091 | static void acpi_dev_pm_detach(struct device *dev, bool power_off) | |
1092 | { | |
1093 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1094 | ||
1095 | if (adev && dev->pm_domain == &acpi_general_pm_domain) { | |
989561de | 1096 | dev_pm_domain_set(dev, NULL); |
91d66cd2 UH |
1097 | acpi_remove_pm_notifier(adev); |
1098 | if (power_off) { | |
1099 | /* | |
1100 | * If the device's PM QoS resume latency limit or flags | |
1101 | * have been exposed to user space, they have to be | |
1102 | * hidden at this point, so that they don't affect the | |
1103 | * choice of the low-power state to put the device into. | |
1104 | */ | |
1105 | dev_pm_qos_hide_latency_limit(dev); | |
1106 | dev_pm_qos_hide_flags(dev); | |
99d8845e | 1107 | acpi_device_wakeup_disable(adev); |
91d66cd2 UH |
1108 | acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); |
1109 | } | |
1110 | } | |
1111 | } | |
1112 | ||
e5cc8ef3 RW |
1113 | /** |
1114 | * acpi_dev_pm_attach - Prepare device for ACPI power management. | |
1115 | * @dev: Device to prepare. | |
b88ce2a4 | 1116 | * @power_on: Whether or not to power on the device. |
e5cc8ef3 RW |
1117 | * |
1118 | * If @dev has a valid ACPI handle that has a valid struct acpi_device object | |
1119 | * attached to it, install a wakeup notification handler for the device and | |
b88ce2a4 RW |
1120 | * add it to the general ACPI PM domain. If @power_on is set, the device will |
1121 | * be put into the ACPI D0 state before the function returns. | |
e5cc8ef3 RW |
1122 | * |
1123 | * This assumes that the @dev's bus type uses generic power management callbacks | |
1124 | * (or doesn't use any power management callbacks at all). | |
1125 | * | |
1126 | * Callers must ensure proper synchronization of this function with power | |
1127 | * management callbacks. | |
1128 | */ | |
b88ce2a4 | 1129 | int acpi_dev_pm_attach(struct device *dev, bool power_on) |
e5cc8ef3 | 1130 | { |
79c0373f | 1131 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
1132 | |
1133 | if (!adev) | |
1134 | return -ENODEV; | |
1135 | ||
1136 | if (dev->pm_domain) | |
1137 | return -EEXIST; | |
1138 | ||
712e960f MW |
1139 | /* |
1140 | * Only attach the power domain to the first device if the | |
1141 | * companion is shared by multiple. This is to prevent doing power | |
1142 | * management twice. | |
1143 | */ | |
1144 | if (!acpi_device_is_first_physical_node(adev, dev)) | |
1145 | return -EBUSY; | |
1146 | ||
c072530f | 1147 | acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); |
989561de | 1148 | dev_pm_domain_set(dev, &acpi_general_pm_domain); |
b88ce2a4 RW |
1149 | if (power_on) { |
1150 | acpi_dev_pm_full_power(adev); | |
99d8845e | 1151 | acpi_device_wakeup_disable(adev); |
b88ce2a4 | 1152 | } |
86f1e15f UH |
1153 | |
1154 | dev->pm_domain->detach = acpi_dev_pm_detach; | |
e5cc8ef3 RW |
1155 | return 0; |
1156 | } | |
1157 | EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); | |
ec4602a9 | 1158 | #endif /* CONFIG_PM */ |