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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ec2cd81c RW |
2 | /* |
3 | * drivers/acpi/device_pm.c - ACPI device power management routines. | |
4 | * | |
5 | * Copyright (C) 2012, Intel Corp. | |
6 | * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
7 | * | |
8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
9 | * | |
ec2cd81c RW |
10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
11 | */ | |
12 | ||
7b199811 | 13 | #include <linux/acpi.h> |
86b3832c | 14 | #include <linux/export.h> |
ec2cd81c | 15 | #include <linux/mutex.h> |
86b3832c | 16 | #include <linux/pm_qos.h> |
989561de | 17 | #include <linux/pm_domain.h> |
cd7bd02d | 18 | #include <linux/pm_runtime.h> |
33e4f80e | 19 | #include <linux/suspend.h> |
ec2cd81c | 20 | |
9ce4e607 RW |
21 | #include "internal.h" |
22 | ||
23 | #define _COMPONENT ACPI_POWER_COMPONENT | |
24 | ACPI_MODULE_NAME("device_pm"); | |
ec2cd81c | 25 | |
9ce4e607 RW |
26 | /** |
27 | * acpi_power_state_string - String representation of ACPI device power state. | |
28 | * @state: ACPI device power state to return the string representation of. | |
29 | */ | |
30 | const char *acpi_power_state_string(int state) | |
31 | { | |
32 | switch (state) { | |
33 | case ACPI_STATE_D0: | |
34 | return "D0"; | |
35 | case ACPI_STATE_D1: | |
36 | return "D1"; | |
37 | case ACPI_STATE_D2: | |
38 | return "D2"; | |
39 | case ACPI_STATE_D3_HOT: | |
40 | return "D3hot"; | |
41 | case ACPI_STATE_D3_COLD: | |
898fee4f | 42 | return "D3cold"; |
9ce4e607 RW |
43 | default: |
44 | return "(unknown)"; | |
45 | } | |
46 | } | |
47 | ||
f850a48a RW |
48 | static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state) |
49 | { | |
50 | unsigned long long psc; | |
51 | acpi_status status; | |
52 | ||
53 | status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc); | |
54 | if (ACPI_FAILURE(status)) | |
55 | return -ENODEV; | |
56 | ||
57 | *state = psc; | |
58 | return 0; | |
59 | } | |
60 | ||
9ce4e607 RW |
61 | /** |
62 | * acpi_device_get_power - Get power state of an ACPI device. | |
63 | * @device: Device to get the power state of. | |
64 | * @state: Place to store the power state of the device. | |
65 | * | |
66 | * This function does not update the device's power.state field, but it may | |
67 | * update its parent's power.state field (when the parent's power state is | |
68 | * unknown and the device's power state turns out to be D0). | |
9ed411c0 RW |
69 | * |
70 | * Also, it does not update power resource reference counters to ensure that | |
71 | * the power state returned by it will be persistent and it may return a power | |
72 | * state shallower than previously set by acpi_device_set_power() for @device | |
73 | * (if that power state depends on any power resources). | |
9ce4e607 RW |
74 | */ |
75 | int acpi_device_get_power(struct acpi_device *device, int *state) | |
76 | { | |
77 | int result = ACPI_STATE_UNKNOWN; | |
f850a48a | 78 | int error; |
9ce4e607 RW |
79 | |
80 | if (!device || !state) | |
81 | return -EINVAL; | |
82 | ||
83 | if (!device->flags.power_manageable) { | |
84 | /* TBD: Non-recursive algorithm for walking up hierarchy. */ | |
85 | *state = device->parent ? | |
86 | device->parent->power.state : ACPI_STATE_D0; | |
87 | goto out; | |
88 | } | |
89 | ||
90 | /* | |
75eb2d13 RW |
91 | * Get the device's power state from power resources settings and _PSC, |
92 | * if available. | |
9ce4e607 | 93 | */ |
75eb2d13 | 94 | if (device->power.flags.power_resources) { |
f850a48a | 95 | error = acpi_power_get_inferred_state(device, &result); |
75eb2d13 RW |
96 | if (error) |
97 | return error; | |
98 | } | |
9ce4e607 | 99 | if (device->power.flags.explicit_get) { |
f850a48a | 100 | int psc; |
75eb2d13 | 101 | |
f850a48a RW |
102 | error = acpi_dev_pm_explicit_get(device, &psc); |
103 | if (error) | |
104 | return error; | |
9ce4e607 | 105 | |
75eb2d13 RW |
106 | /* |
107 | * The power resources settings may indicate a power state | |
20dacb71 RW |
108 | * shallower than the actual power state of the device, because |
109 | * the same power resources may be referenced by other devices. | |
75eb2d13 | 110 | * |
20dacb71 RW |
111 | * For systems predating ACPI 4.0 we assume that D3hot is the |
112 | * deepest state that can be supported. | |
75eb2d13 RW |
113 | */ |
114 | if (psc > result && psc < ACPI_STATE_D3_COLD) | |
115 | result = psc; | |
116 | else if (result == ACPI_STATE_UNKNOWN) | |
20dacb71 | 117 | result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc; |
9ce4e607 RW |
118 | } |
119 | ||
120 | /* | |
121 | * If we were unsure about the device parent's power state up to this | |
122 | * point, the fact that the device is in D0 implies that the parent has | |
644f17ad | 123 | * to be in D0 too, except if ignore_parent is set. |
9ce4e607 | 124 | */ |
644f17ad MW |
125 | if (!device->power.flags.ignore_parent && device->parent |
126 | && device->parent->power.state == ACPI_STATE_UNKNOWN | |
9ce4e607 RW |
127 | && result == ACPI_STATE_D0) |
128 | device->parent->power.state = ACPI_STATE_D0; | |
129 | ||
130 | *state = result; | |
131 | ||
132 | out: | |
133 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", | |
134 | device->pnp.bus_id, acpi_power_state_string(*state))); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
9c0f45e3 RW |
139 | static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
140 | { | |
141 | if (adev->power.states[state].flags.explicit_set) { | |
142 | char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; | |
143 | acpi_status status; | |
144 | ||
145 | status = acpi_evaluate_object(adev->handle, method, NULL, NULL); | |
146 | if (ACPI_FAILURE(status)) | |
147 | return -ENODEV; | |
148 | } | |
149 | return 0; | |
150 | } | |
151 | ||
9ce4e607 RW |
152 | /** |
153 | * acpi_device_set_power - Set power state of an ACPI device. | |
154 | * @device: Device to set the power state of. | |
155 | * @state: New power state to set. | |
156 | * | |
157 | * Callers must ensure that the device is power manageable before using this | |
158 | * function. | |
159 | */ | |
160 | int acpi_device_set_power(struct acpi_device *device, int state) | |
161 | { | |
20dacb71 | 162 | int target_state = state; |
9ce4e607 | 163 | int result = 0; |
9ce4e607 | 164 | |
2c7d132a RW |
165 | if (!device || !device->flags.power_manageable |
166 | || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) | |
9ce4e607 RW |
167 | return -EINVAL; |
168 | ||
ee8193ee RW |
169 | acpi_handle_debug(device->handle, "Power state change: %s -> %s\n", |
170 | acpi_power_state_string(device->power.state), | |
171 | acpi_power_state_string(state)); | |
172 | ||
9ce4e607 RW |
173 | /* Make sure this is a valid target state */ |
174 | ||
f850a48a RW |
175 | /* There is a special case for D0 addressed below. */ |
176 | if (state > ACPI_STATE_D0 && state == device->power.state) { | |
b69137a7 RW |
177 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", |
178 | device->pnp.bus_id, | |
9ce4e607 RW |
179 | acpi_power_state_string(state))); |
180 | return 0; | |
181 | } | |
182 | ||
20dacb71 RW |
183 | if (state == ACPI_STATE_D3_COLD) { |
184 | /* | |
185 | * For transitions to D3cold we need to execute _PS3 and then | |
186 | * possibly drop references to the power resources in use. | |
187 | */ | |
188 | state = ACPI_STATE_D3_HOT; | |
a2d1ac6f | 189 | /* If D3cold is not supported, use D3hot as the target state. */ |
20dacb71 RW |
190 | if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) |
191 | target_state = state; | |
192 | } else if (!device->power.states[state].flags.valid) { | |
b69137a7 RW |
193 | dev_warn(&device->dev, "Power state %s not supported\n", |
194 | acpi_power_state_string(state)); | |
9ce4e607 RW |
195 | return -ENODEV; |
196 | } | |
20dacb71 | 197 | |
644f17ad MW |
198 | if (!device->power.flags.ignore_parent && |
199 | device->parent && (state < device->parent->power.state)) { | |
b69137a7 | 200 | dev_warn(&device->dev, |
593298e6 AL |
201 | "Cannot transition to power state %s for parent in %s\n", |
202 | acpi_power_state_string(state), | |
203 | acpi_power_state_string(device->parent->power.state)); | |
9ce4e607 RW |
204 | return -ENODEV; |
205 | } | |
206 | ||
9ce4e607 RW |
207 | /* |
208 | * Transition Power | |
209 | * ---------------- | |
20dacb71 RW |
210 | * In accordance with ACPI 6, _PSx is executed before manipulating power |
211 | * resources, unless the target state is D0, in which case _PS0 is | |
212 | * supposed to be executed after turning the power resources on. | |
9ce4e607 | 213 | */ |
20dacb71 RW |
214 | if (state > ACPI_STATE_D0) { |
215 | /* | |
216 | * According to ACPI 6, devices cannot go from lower-power | |
217 | * (deeper) states to higher-power (shallower) states. | |
218 | */ | |
219 | if (state < device->power.state) { | |
220 | dev_warn(&device->dev, "Cannot transition from %s to %s\n", | |
221 | acpi_power_state_string(device->power.state), | |
222 | acpi_power_state_string(state)); | |
223 | return -ENODEV; | |
224 | } | |
225 | ||
21ba2379 RW |
226 | /* |
227 | * If the device goes from D3hot to D3cold, _PS3 has been | |
228 | * evaluated for it already, so skip it in that case. | |
229 | */ | |
230 | if (device->power.state < ACPI_STATE_D3_HOT) { | |
231 | result = acpi_dev_pm_explicit_set(device, state); | |
232 | if (result) | |
233 | goto end; | |
234 | } | |
9ce4e607 | 235 | |
20dacb71 RW |
236 | if (device->power.flags.power_resources) |
237 | result = acpi_power_transition(device, target_state); | |
238 | } else { | |
42787ed7 RW |
239 | int cur_state = device->power.state; |
240 | ||
20dacb71 RW |
241 | if (device->power.flags.power_resources) { |
242 | result = acpi_power_transition(device, ACPI_STATE_D0); | |
243 | if (result) | |
244 | goto end; | |
245 | } | |
f850a48a | 246 | |
42787ed7 | 247 | if (cur_state == ACPI_STATE_D0) { |
f850a48a RW |
248 | int psc; |
249 | ||
250 | /* Nothing to do here if _PSC is not present. */ | |
251 | if (!device->power.flags.explicit_get) | |
252 | return 0; | |
253 | ||
254 | /* | |
255 | * The power state of the device was set to D0 last | |
256 | * time, but that might have happened before a | |
257 | * system-wide transition involving the platform | |
258 | * firmware, so it may be necessary to evaluate _PS0 | |
259 | * for the device here. However, use extra care here | |
260 | * and evaluate _PSC to check the device's current power | |
261 | * state, and only invoke _PS0 if the evaluation of _PSC | |
262 | * is successful and it returns a power state different | |
263 | * from D0. | |
264 | */ | |
265 | result = acpi_dev_pm_explicit_get(device, &psc); | |
266 | if (result || psc == ACPI_STATE_D0) | |
267 | return 0; | |
268 | } | |
269 | ||
20dacb71 | 270 | result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); |
e5656271 | 271 | } |
9ce4e607 | 272 | |
e78adb75 RW |
273 | end: |
274 | if (result) { | |
b69137a7 | 275 | dev_warn(&device->dev, "Failed to change power state to %s\n", |
19d39a89 | 276 | acpi_power_state_string(target_state)); |
e78adb75 | 277 | } else { |
71b65445 | 278 | device->power.state = target_state; |
9ce4e607 RW |
279 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
280 | "Device [%s] transitioned to %s\n", | |
281 | device->pnp.bus_id, | |
19d39a89 | 282 | acpi_power_state_string(target_state))); |
9ce4e607 RW |
283 | } |
284 | ||
285 | return result; | |
286 | } | |
287 | EXPORT_SYMBOL(acpi_device_set_power); | |
288 | ||
289 | int acpi_bus_set_power(acpi_handle handle, int state) | |
290 | { | |
291 | struct acpi_device *device; | |
292 | int result; | |
293 | ||
294 | result = acpi_bus_get_device(handle, &device); | |
295 | if (result) | |
296 | return result; | |
297 | ||
9ce4e607 RW |
298 | return acpi_device_set_power(device, state); |
299 | } | |
300 | EXPORT_SYMBOL(acpi_bus_set_power); | |
301 | ||
302 | int acpi_bus_init_power(struct acpi_device *device) | |
303 | { | |
304 | int state; | |
305 | int result; | |
306 | ||
307 | if (!device) | |
308 | return -EINVAL; | |
309 | ||
310 | device->power.state = ACPI_STATE_UNKNOWN; | |
cde1f95f SA |
311 | if (!acpi_device_is_present(device)) { |
312 | device->flags.initialized = false; | |
1b1f3e16 | 313 | return -ENXIO; |
cde1f95f | 314 | } |
9ce4e607 RW |
315 | |
316 | result = acpi_device_get_power(device, &state); | |
317 | if (result) | |
318 | return result; | |
319 | ||
a2367807 | 320 | if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { |
20dacb71 | 321 | /* Reference count the power resources. */ |
9ce4e607 | 322 | result = acpi_power_on_resources(device, state); |
a2367807 RW |
323 | if (result) |
324 | return result; | |
9ce4e607 | 325 | |
20dacb71 RW |
326 | if (state == ACPI_STATE_D0) { |
327 | /* | |
328 | * If _PSC is not present and the state inferred from | |
329 | * power resources appears to be D0, it still may be | |
330 | * necessary to execute _PS0 at this point, because | |
331 | * another device using the same power resources may | |
332 | * have been put into D0 previously and that's why we | |
333 | * see D0 here. | |
334 | */ | |
335 | result = acpi_dev_pm_explicit_set(device, state); | |
336 | if (result) | |
337 | return result; | |
338 | } | |
b3785492 | 339 | } else if (state == ACPI_STATE_UNKNOWN) { |
7cd8407d RW |
340 | /* |
341 | * No power resources and missing _PSC? Cross fingers and make | |
342 | * it D0 in hope that this is what the BIOS put the device into. | |
343 | * [We tried to force D0 here by executing _PS0, but that broke | |
344 | * Toshiba P870-303 in a nasty way.] | |
345 | */ | |
b3785492 | 346 | state = ACPI_STATE_D0; |
a2367807 RW |
347 | } |
348 | device->power.state = state; | |
349 | return 0; | |
9ce4e607 RW |
350 | } |
351 | ||
b9e95fc6 RW |
352 | /** |
353 | * acpi_device_fix_up_power - Force device with missing _PSC into D0. | |
354 | * @device: Device object whose power state is to be fixed up. | |
355 | * | |
356 | * Devices without power resources and _PSC, but having _PS0 and _PS3 defined, | |
357 | * are assumed to be put into D0 by the BIOS. However, in some cases that may | |
358 | * not be the case and this function should be used then. | |
359 | */ | |
360 | int acpi_device_fix_up_power(struct acpi_device *device) | |
361 | { | |
362 | int ret = 0; | |
363 | ||
364 | if (!device->power.flags.power_resources | |
365 | && !device->power.flags.explicit_get | |
366 | && device->power.state == ACPI_STATE_D0) | |
367 | ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
368 | ||
369 | return ret; | |
370 | } | |
78a898d0 | 371 | EXPORT_SYMBOL_GPL(acpi_device_fix_up_power); |
b9e95fc6 | 372 | |
202317a5 | 373 | int acpi_device_update_power(struct acpi_device *device, int *state_p) |
9ce4e607 | 374 | { |
9ce4e607 RW |
375 | int state; |
376 | int result; | |
377 | ||
202317a5 RW |
378 | if (device->power.state == ACPI_STATE_UNKNOWN) { |
379 | result = acpi_bus_init_power(device); | |
380 | if (!result && state_p) | |
381 | *state_p = device->power.state; | |
382 | ||
9ce4e607 | 383 | return result; |
202317a5 | 384 | } |
9ce4e607 RW |
385 | |
386 | result = acpi_device_get_power(device, &state); | |
387 | if (result) | |
388 | return result; | |
389 | ||
91bdad0b | 390 | if (state == ACPI_STATE_UNKNOWN) { |
511d5c42 | 391 | state = ACPI_STATE_D0; |
91bdad0b RW |
392 | result = acpi_device_set_power(device, state); |
393 | if (result) | |
394 | return result; | |
395 | } else { | |
396 | if (device->power.flags.power_resources) { | |
397 | /* | |
398 | * We don't need to really switch the state, bu we need | |
399 | * to update the power resources' reference counters. | |
400 | */ | |
401 | result = acpi_power_transition(device, state); | |
402 | if (result) | |
403 | return result; | |
404 | } | |
405 | device->power.state = state; | |
406 | } | |
407 | if (state_p) | |
9ce4e607 RW |
408 | *state_p = state; |
409 | ||
91bdad0b | 410 | return 0; |
9ce4e607 | 411 | } |
2bb3a2bf | 412 | EXPORT_SYMBOL_GPL(acpi_device_update_power); |
202317a5 RW |
413 | |
414 | int acpi_bus_update_power(acpi_handle handle, int *state_p) | |
415 | { | |
416 | struct acpi_device *device; | |
417 | int result; | |
418 | ||
419 | result = acpi_bus_get_device(handle, &device); | |
420 | return result ? result : acpi_device_update_power(device, state_p); | |
421 | } | |
9ce4e607 RW |
422 | EXPORT_SYMBOL_GPL(acpi_bus_update_power); |
423 | ||
424 | bool acpi_bus_power_manageable(acpi_handle handle) | |
425 | { | |
426 | struct acpi_device *device; | |
427 | int result; | |
428 | ||
429 | result = acpi_bus_get_device(handle, &device); | |
430 | return result ? false : device->flags.power_manageable; | |
431 | } | |
432 | EXPORT_SYMBOL(acpi_bus_power_manageable); | |
433 | ||
ec4602a9 RW |
434 | #ifdef CONFIG_PM |
435 | static DEFINE_MUTEX(acpi_pm_notifier_lock); | |
ff165679 | 436 | static DEFINE_MUTEX(acpi_pm_notifier_install_lock); |
ec4602a9 | 437 | |
33e4f80e RW |
438 | void acpi_pm_wakeup_event(struct device *dev) |
439 | { | |
440 | pm_wakeup_dev_event(dev, 0, acpi_s2idle_wakeup()); | |
441 | } | |
442 | EXPORT_SYMBOL_GPL(acpi_pm_wakeup_event); | |
443 | ||
c072530f RW |
444 | static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) |
445 | { | |
446 | struct acpi_device *adev; | |
447 | ||
448 | if (val != ACPI_NOTIFY_DEVICE_WAKE) | |
449 | return; | |
450 | ||
020a6375 RW |
451 | acpi_handle_debug(handle, "Wake notify\n"); |
452 | ||
c072530f RW |
453 | adev = acpi_bus_get_acpi_device(handle); |
454 | if (!adev) | |
455 | return; | |
456 | ||
457 | mutex_lock(&acpi_pm_notifier_lock); | |
458 | ||
459 | if (adev->wakeup.flags.notifier_present) { | |
33e4f80e | 460 | pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup()); |
020a6375 | 461 | if (adev->wakeup.context.func) { |
d75f773c | 462 | acpi_handle_debug(handle, "Running %pS for %s\n", |
020a6375 RW |
463 | adev->wakeup.context.func, |
464 | dev_name(adev->wakeup.context.dev)); | |
64fd1c70 | 465 | adev->wakeup.context.func(&adev->wakeup.context); |
020a6375 | 466 | } |
c072530f RW |
467 | } |
468 | ||
469 | mutex_unlock(&acpi_pm_notifier_lock); | |
470 | ||
471 | acpi_bus_put_acpi_device(adev); | |
472 | } | |
473 | ||
ec4602a9 | 474 | /** |
c072530f RW |
475 | * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. |
476 | * @adev: ACPI device to add the notify handler for. | |
477 | * @dev: Device to generate a wakeup event for while handling the notification. | |
64fd1c70 | 478 | * @func: Work function to execute when handling the notification. |
ec4602a9 RW |
479 | * |
480 | * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of | |
481 | * PM wakeup events. For example, wakeup events may be generated for bridges | |
482 | * if one of the devices below the bridge is signaling wakeup, even if the | |
483 | * bridge itself doesn't have a wakeup GPE associated with it. | |
484 | */ | |
c072530f | 485 | acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, |
64fd1c70 | 486 | void (*func)(struct acpi_device_wakeup_context *context)) |
ec4602a9 RW |
487 | { |
488 | acpi_status status = AE_ALREADY_EXISTS; | |
489 | ||
64fd1c70 | 490 | if (!dev && !func) |
c072530f RW |
491 | return AE_BAD_PARAMETER; |
492 | ||
ff165679 | 493 | mutex_lock(&acpi_pm_notifier_install_lock); |
ec4602a9 RW |
494 | |
495 | if (adev->wakeup.flags.notifier_present) | |
496 | goto out; | |
497 | ||
c072530f RW |
498 | status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, |
499 | acpi_pm_notify_handler, NULL); | |
ec4602a9 RW |
500 | if (ACPI_FAILURE(status)) |
501 | goto out; | |
502 | ||
ff165679 | 503 | mutex_lock(&acpi_pm_notifier_lock); |
c8377adf TV |
504 | adev->wakeup.ws = wakeup_source_register(&adev->dev, |
505 | dev_name(&adev->dev)); | |
ff165679 VS |
506 | adev->wakeup.context.dev = dev; |
507 | adev->wakeup.context.func = func; | |
ec4602a9 | 508 | adev->wakeup.flags.notifier_present = true; |
ff165679 | 509 | mutex_unlock(&acpi_pm_notifier_lock); |
ec4602a9 RW |
510 | |
511 | out: | |
ff165679 | 512 | mutex_unlock(&acpi_pm_notifier_install_lock); |
ec4602a9 RW |
513 | return status; |
514 | } | |
515 | ||
516 | /** | |
517 | * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
518 | * @adev: ACPI device to remove the notifier from. | |
519 | */ | |
c072530f | 520 | acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) |
ec4602a9 RW |
521 | { |
522 | acpi_status status = AE_BAD_PARAMETER; | |
523 | ||
ff165679 | 524 | mutex_lock(&acpi_pm_notifier_install_lock); |
ec4602a9 RW |
525 | |
526 | if (!adev->wakeup.flags.notifier_present) | |
527 | goto out; | |
528 | ||
529 | status = acpi_remove_notify_handler(adev->handle, | |
530 | ACPI_SYSTEM_NOTIFY, | |
c072530f | 531 | acpi_pm_notify_handler); |
ec4602a9 RW |
532 | if (ACPI_FAILURE(status)) |
533 | goto out; | |
534 | ||
ff165679 | 535 | mutex_lock(&acpi_pm_notifier_lock); |
64fd1c70 | 536 | adev->wakeup.context.func = NULL; |
c072530f RW |
537 | adev->wakeup.context.dev = NULL; |
538 | wakeup_source_unregister(adev->wakeup.ws); | |
ec4602a9 | 539 | adev->wakeup.flags.notifier_present = false; |
ff165679 | 540 | mutex_unlock(&acpi_pm_notifier_lock); |
ec4602a9 RW |
541 | |
542 | out: | |
ff165679 | 543 | mutex_unlock(&acpi_pm_notifier_install_lock); |
ec4602a9 RW |
544 | return status; |
545 | } | |
546 | ||
9ce4e607 RW |
547 | bool acpi_bus_can_wakeup(acpi_handle handle) |
548 | { | |
549 | struct acpi_device *device; | |
550 | int result; | |
551 | ||
552 | result = acpi_bus_get_device(handle, &device); | |
553 | return result ? false : device->wakeup.flags.valid; | |
554 | } | |
555 | EXPORT_SYMBOL(acpi_bus_can_wakeup); | |
556 | ||
8370c2dc RW |
557 | bool acpi_pm_device_can_wakeup(struct device *dev) |
558 | { | |
559 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
560 | ||
561 | return adev ? acpi_device_can_wakeup(adev) : false; | |
562 | } | |
563 | ||
86b3832c | 564 | /** |
b25c77ef | 565 | * acpi_dev_pm_get_state - Get preferred power state of ACPI device. |
86b3832c RW |
566 | * @dev: Device whose preferred target power state to return. |
567 | * @adev: ACPI device node corresponding to @dev. | |
568 | * @target_state: System state to match the resultant device state. | |
fa1675b5 RW |
569 | * @d_min_p: Location to store the highest power state available to the device. |
570 | * @d_max_p: Location to store the lowest power state available to the device. | |
86b3832c | 571 | * |
fa1675b5 RW |
572 | * Find the lowest power (highest number) and highest power (lowest number) ACPI |
573 | * device power states that the device can be in while the system is in the | |
574 | * state represented by @target_state. Store the integer numbers representing | |
575 | * those stats in the memory locations pointed to by @d_max_p and @d_min_p, | |
576 | * respectively. | |
86b3832c RW |
577 | * |
578 | * Callers must ensure that @dev and @adev are valid pointers and that @adev | |
579 | * actually corresponds to @dev before using this function. | |
fa1675b5 RW |
580 | * |
581 | * Returns 0 on success or -ENODATA when one of the ACPI methods fails or | |
582 | * returns a value that doesn't make sense. The memory locations pointed to by | |
583 | * @d_max_p and @d_min_p are only modified on success. | |
86b3832c | 584 | */ |
b25c77ef | 585 | static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, |
fa1675b5 | 586 | u32 target_state, int *d_min_p, int *d_max_p) |
86b3832c | 587 | { |
fa1675b5 RW |
588 | char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; |
589 | acpi_handle handle = adev->handle; | |
590 | unsigned long long ret; | |
591 | int d_min, d_max; | |
86b3832c | 592 | bool wakeup = false; |
bf8c6184 | 593 | bool has_sxd = false; |
fa1675b5 | 594 | acpi_status status; |
86b3832c | 595 | |
86b3832c | 596 | /* |
fa1675b5 RW |
597 | * If the system state is S0, the lowest power state the device can be |
598 | * in is D3cold, unless the device has _S0W and is supposed to signal | |
599 | * wakeup, in which case the return value of _S0W has to be used as the | |
600 | * lowest power state available to the device. | |
86b3832c RW |
601 | */ |
602 | d_min = ACPI_STATE_D0; | |
4c164ae7 | 603 | d_max = ACPI_STATE_D3_COLD; |
86b3832c RW |
604 | |
605 | /* | |
606 | * If present, _SxD methods return the minimum D-state (highest power | |
607 | * state) we can use for the corresponding S-states. Otherwise, the | |
608 | * minimum D-state is D0 (ACPI 3.x). | |
86b3832c RW |
609 | */ |
610 | if (target_state > ACPI_STATE_S0) { | |
fa1675b5 RW |
611 | /* |
612 | * We rely on acpi_evaluate_integer() not clobbering the integer | |
613 | * provided if AE_NOT_FOUND is returned. | |
614 | */ | |
615 | ret = d_min; | |
616 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
617 | if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) | |
618 | || ret > ACPI_STATE_D3_COLD) | |
619 | return -ENODATA; | |
620 | ||
621 | /* | |
622 | * We need to handle legacy systems where D3hot and D3cold are | |
623 | * the same and 3 is returned in both cases, so fall back to | |
624 | * D3cold if D3hot is not a valid state. | |
625 | */ | |
626 | if (!adev->power.states[ret].flags.valid) { | |
627 | if (ret == ACPI_STATE_D3_HOT) | |
628 | ret = ACPI_STATE_D3_COLD; | |
629 | else | |
630 | return -ENODATA; | |
631 | } | |
bf8c6184 DD |
632 | |
633 | if (status == AE_OK) | |
634 | has_sxd = true; | |
635 | ||
fa1675b5 | 636 | d_min = ret; |
86b3832c RW |
637 | wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid |
638 | && adev->wakeup.sleep_state >= target_state; | |
20f97caf | 639 | } else { |
86b3832c RW |
640 | wakeup = adev->wakeup.flags.valid; |
641 | } | |
642 | ||
643 | /* | |
644 | * If _PRW says we can wake up the system from the target sleep state, | |
645 | * the D-state returned by _SxD is sufficient for that (we assume a | |
646 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
647 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
648 | * can wake the system. _S0W may be valid, too. | |
649 | */ | |
650 | if (wakeup) { | |
fa1675b5 RW |
651 | method[3] = 'W'; |
652 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
653 | if (status == AE_NOT_FOUND) { | |
bf8c6184 DD |
654 | /* No _SxW. In this case, the ACPI spec says that we |
655 | * must not go into any power state deeper than the | |
656 | * value returned from _SxD. | |
657 | */ | |
658 | if (has_sxd && target_state > ACPI_STATE_S0) | |
86b3832c | 659 | d_max = d_min; |
fa1675b5 RW |
660 | } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { |
661 | /* Fall back to D3cold if ret is not a valid state. */ | |
662 | if (!adev->power.states[ret].flags.valid) | |
663 | ret = ACPI_STATE_D3_COLD; | |
664 | ||
665 | d_max = ret > d_min ? ret : d_min; | |
666 | } else { | |
667 | return -ENODATA; | |
86b3832c RW |
668 | } |
669 | } | |
670 | ||
86b3832c RW |
671 | if (d_min_p) |
672 | *d_min_p = d_min; | |
fa1675b5 RW |
673 | |
674 | if (d_max_p) | |
675 | *d_max_p = d_max; | |
676 | ||
677 | return 0; | |
86b3832c | 678 | } |
cd7bd02d | 679 | |
a6ae7594 RW |
680 | /** |
681 | * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. | |
682 | * @dev: Device whose preferred target power state to return. | |
683 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
684 | * @d_max_in: Deepest low-power state to take into consideration. | |
685 | * Return value: Preferred power state of the device on success, -ENODEV | |
fa1675b5 RW |
686 | * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is |
687 | * incorrect, or -ENODATA on ACPI method failure. | |
a6ae7594 RW |
688 | * |
689 | * The caller must ensure that @dev is valid before using this function. | |
690 | */ | |
691 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) | |
692 | { | |
a6ae7594 | 693 | struct acpi_device *adev; |
9b5c7a5a | 694 | int ret, d_min, d_max; |
fa1675b5 RW |
695 | |
696 | if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) | |
697 | return -EINVAL; | |
698 | ||
20dacb71 | 699 | if (d_max_in > ACPI_STATE_D2) { |
fa1675b5 RW |
700 | enum pm_qos_flags_status stat; |
701 | ||
702 | stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); | |
703 | if (stat == PM_QOS_FLAGS_ALL) | |
20dacb71 | 704 | d_max_in = ACPI_STATE_D2; |
fa1675b5 | 705 | } |
a6ae7594 | 706 | |
17653a3e RW |
707 | adev = ACPI_COMPANION(dev); |
708 | if (!adev) { | |
709 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
710 | return -ENODEV; |
711 | } | |
712 | ||
fa1675b5 | 713 | ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), |
9b5c7a5a | 714 | &d_min, &d_max); |
fa1675b5 RW |
715 | if (ret) |
716 | return ret; | |
717 | ||
9b5c7a5a | 718 | if (d_max_in < d_min) |
fa1675b5 RW |
719 | return -EINVAL; |
720 | ||
721 | if (d_max > d_max_in) { | |
9b5c7a5a | 722 | for (d_max = d_max_in; d_max > d_min; d_max--) { |
fa1675b5 RW |
723 | if (adev->power.states[d_max].flags.valid) |
724 | break; | |
725 | } | |
726 | } | |
9b5c7a5a RW |
727 | |
728 | if (d_min_p) | |
729 | *d_min_p = d_min; | |
730 | ||
fa1675b5 | 731 | return d_max; |
a6ae7594 RW |
732 | } |
733 | EXPORT_SYMBOL(acpi_pm_device_sleep_state); | |
734 | ||
e5cc8ef3 | 735 | /** |
c072530f | 736 | * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. |
64fd1c70 | 737 | * @context: Device wakeup context. |
e5cc8ef3 | 738 | */ |
64fd1c70 | 739 | static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context) |
e5cc8ef3 | 740 | { |
64fd1c70 | 741 | struct device *dev = context->dev; |
e5cc8ef3 | 742 | |
c072530f | 743 | if (dev) { |
e5cc8ef3 | 744 | pm_wakeup_event(dev, 0); |
64fd1c70 | 745 | pm_request_resume(dev); |
e5cc8ef3 RW |
746 | } |
747 | } | |
748 | ||
99d8845e RW |
749 | static DEFINE_MUTEX(acpi_wakeup_lock); |
750 | ||
1ba51a7c | 751 | static int __acpi_device_wakeup_enable(struct acpi_device *adev, |
04626e56 | 752 | u32 target_state) |
dee8370c RW |
753 | { |
754 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
99d8845e RW |
755 | acpi_status status; |
756 | int error = 0; | |
dee8370c | 757 | |
99d8845e | 758 | mutex_lock(&acpi_wakeup_lock); |
dee8370c | 759 | |
1b33df60 RW |
760 | /* |
761 | * If the device wakeup power is already enabled, disable it and enable | |
762 | * it again in case it depends on the configuration of subordinate | |
763 | * devices and the conditions have changed since it was enabled last | |
764 | * time. | |
765 | */ | |
1ba51a7c | 766 | if (wakeup->enable_count > 0) |
1b33df60 | 767 | acpi_disable_wakeup_device_power(adev); |
1ba51a7c | 768 | |
99d8845e | 769 | error = acpi_enable_wakeup_device_power(adev, target_state); |
1b33df60 RW |
770 | if (error) { |
771 | if (wakeup->enable_count > 0) { | |
772 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
773 | wakeup->enable_count = 0; | |
774 | } | |
99d8845e | 775 | goto out; |
1b33df60 RW |
776 | } |
777 | ||
778 | if (wakeup->enable_count > 0) | |
779 | goto inc; | |
dee8370c | 780 | |
99d8845e RW |
781 | status = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
782 | if (ACPI_FAILURE(status)) { | |
dee8370c | 783 | acpi_disable_wakeup_device_power(adev); |
99d8845e RW |
784 | error = -EIO; |
785 | goto out; | |
dee8370c | 786 | } |
99d8845e | 787 | |
fbc9418f RW |
788 | acpi_handle_debug(adev->handle, "GPE%2X enabled for wakeup\n", |
789 | (unsigned int)wakeup->gpe_number); | |
790 | ||
1ba51a7c | 791 | inc: |
1b33df60 RW |
792 | if (wakeup->enable_count < INT_MAX) |
793 | wakeup->enable_count++; | |
794 | else | |
795 | acpi_handle_info(adev->handle, "Wakeup enable count out of bounds!\n"); | |
99d8845e RW |
796 | |
797 | out: | |
798 | mutex_unlock(&acpi_wakeup_lock); | |
799 | return error; | |
800 | } | |
801 | ||
1ba51a7c RW |
802 | /** |
803 | * acpi_device_wakeup_enable - Enable wakeup functionality for device. | |
804 | * @adev: ACPI device to enable wakeup functionality for. | |
805 | * @target_state: State the system is transitioning into. | |
806 | * | |
807 | * Enable the GPE associated with @adev so that it can generate wakeup signals | |
808 | * for the device in response to external (remote) events and enable wakeup | |
809 | * power for it. | |
810 | * | |
811 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
812 | * this function. | |
813 | */ | |
814 | static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state) | |
815 | { | |
04626e56 | 816 | return __acpi_device_wakeup_enable(adev, target_state); |
1ba51a7c RW |
817 | } |
818 | ||
99d8845e RW |
819 | /** |
820 | * acpi_device_wakeup_disable - Disable wakeup functionality for device. | |
821 | * @adev: ACPI device to disable wakeup functionality for. | |
822 | * | |
823 | * Disable the GPE associated with @adev and disable wakeup power for it. | |
824 | * | |
825 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
826 | * this function. | |
827 | */ | |
828 | static void acpi_device_wakeup_disable(struct acpi_device *adev) | |
829 | { | |
830 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
831 | ||
832 | mutex_lock(&acpi_wakeup_lock); | |
833 | ||
834 | if (!wakeup->enable_count) | |
835 | goto out; | |
836 | ||
837 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
838 | acpi_disable_wakeup_device_power(adev); | |
839 | ||
840 | wakeup->enable_count--; | |
841 | ||
842 | out: | |
843 | mutex_unlock(&acpi_wakeup_lock); | |
dee8370c RW |
844 | } |
845 | ||
04626e56 RW |
846 | /** |
847 | * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device. | |
848 | * @dev: Device to enable/disable to generate wakeup events. | |
849 | * @enable: Whether to enable or disable the wakeup functionality. | |
850 | */ | |
851 | int acpi_pm_set_device_wakeup(struct device *dev, bool enable) | |
a6ae7594 | 852 | { |
a6ae7594 RW |
853 | struct acpi_device *adev; |
854 | int error; | |
855 | ||
17653a3e RW |
856 | adev = ACPI_COMPANION(dev); |
857 | if (!adev) { | |
858 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
859 | return -ENODEV; |
860 | } | |
861 | ||
4d183d04 RW |
862 | if (!acpi_device_can_wakeup(adev)) |
863 | return -EINVAL; | |
864 | ||
99d8845e RW |
865 | if (!enable) { |
866 | acpi_device_wakeup_disable(adev); | |
867 | dev_dbg(dev, "Wakeup disabled by ACPI\n"); | |
868 | return 0; | |
869 | } | |
870 | ||
04626e56 | 871 | error = __acpi_device_wakeup_enable(adev, acpi_target_system_state()); |
a6ae7594 | 872 | if (!error) |
99d8845e | 873 | dev_dbg(dev, "Wakeup enabled by ACPI\n"); |
a6ae7594 RW |
874 | |
875 | return error; | |
876 | } | |
1ba51a7c RW |
877 | EXPORT_SYMBOL_GPL(acpi_pm_set_device_wakeup); |
878 | ||
e5cc8ef3 RW |
879 | /** |
880 | * acpi_dev_pm_low_power - Put ACPI device into a low-power state. | |
881 | * @dev: Device to put into a low-power state. | |
882 | * @adev: ACPI device node corresponding to @dev. | |
883 | * @system_state: System state to choose the device state for. | |
884 | */ | |
885 | static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, | |
886 | u32 system_state) | |
887 | { | |
fa1675b5 | 888 | int ret, state; |
e5cc8ef3 RW |
889 | |
890 | if (!acpi_device_power_manageable(adev)) | |
891 | return 0; | |
892 | ||
fa1675b5 RW |
893 | ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); |
894 | return ret ? ret : acpi_device_set_power(adev, state); | |
e5cc8ef3 RW |
895 | } |
896 | ||
897 | /** | |
898 | * acpi_dev_pm_full_power - Put ACPI device into the full-power state. | |
899 | * @adev: ACPI device node to put into the full-power state. | |
900 | */ | |
901 | static int acpi_dev_pm_full_power(struct acpi_device *adev) | |
902 | { | |
903 | return acpi_device_power_manageable(adev) ? | |
904 | acpi_device_set_power(adev, ACPI_STATE_D0) : 0; | |
905 | } | |
906 | ||
e5cc8ef3 | 907 | /** |
cbe25ce3 | 908 | * acpi_dev_suspend - Put device into a low-power state using ACPI. |
e5cc8ef3 | 909 | * @dev: Device to put into a low-power state. |
cbe25ce3 | 910 | * @wakeup: Whether or not to enable wakeup for the device. |
e5cc8ef3 | 911 | * |
cbe25ce3 | 912 | * Put the given device into a low-power state using the standard ACPI |
e5cc8ef3 RW |
913 | * mechanism. Set up remote wakeup if desired, choose the state to put the |
914 | * device into (this checks if remote wakeup is expected to work too), and set | |
915 | * the power state of the device. | |
916 | */ | |
cbe25ce3 | 917 | int acpi_dev_suspend(struct device *dev, bool wakeup) |
e5cc8ef3 | 918 | { |
79c0373f | 919 | struct acpi_device *adev = ACPI_COMPANION(dev); |
cbe25ce3 | 920 | u32 target_state = acpi_target_system_state(); |
e5cc8ef3 RW |
921 | int error; |
922 | ||
923 | if (!adev) | |
924 | return 0; | |
925 | ||
cbe25ce3 RW |
926 | if (wakeup && acpi_device_can_wakeup(adev)) { |
927 | error = acpi_device_wakeup_enable(adev, target_state); | |
99d8845e RW |
928 | if (error) |
929 | return -EAGAIN; | |
cbe25ce3 RW |
930 | } else { |
931 | wakeup = false; | |
99d8845e | 932 | } |
e5cc8ef3 | 933 | |
cbe25ce3 RW |
934 | error = acpi_dev_pm_low_power(dev, adev, target_state); |
935 | if (error && wakeup) | |
99d8845e | 936 | acpi_device_wakeup_disable(adev); |
e5cc8ef3 RW |
937 | |
938 | return error; | |
939 | } | |
cbe25ce3 | 940 | EXPORT_SYMBOL_GPL(acpi_dev_suspend); |
e5cc8ef3 RW |
941 | |
942 | /** | |
63705c40 | 943 | * acpi_dev_resume - Put device into the full-power state using ACPI. |
e5cc8ef3 RW |
944 | * @dev: Device to put into the full-power state. |
945 | * | |
946 | * Put the given device into the full-power state using the standard ACPI | |
63705c40 | 947 | * mechanism. Set the power state of the device to ACPI D0 and disable wakeup. |
e5cc8ef3 | 948 | */ |
63705c40 | 949 | int acpi_dev_resume(struct device *dev) |
e5cc8ef3 | 950 | { |
79c0373f | 951 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
952 | int error; |
953 | ||
954 | if (!adev) | |
955 | return 0; | |
956 | ||
957 | error = acpi_dev_pm_full_power(adev); | |
99d8845e | 958 | acpi_device_wakeup_disable(adev); |
e5cc8ef3 RW |
959 | return error; |
960 | } | |
63705c40 | 961 | EXPORT_SYMBOL_GPL(acpi_dev_resume); |
e5cc8ef3 RW |
962 | |
963 | /** | |
964 | * acpi_subsys_runtime_suspend - Suspend device using ACPI. | |
965 | * @dev: Device to suspend. | |
966 | * | |
967 | * Carry out the generic runtime suspend procedure for @dev and use ACPI to put | |
968 | * it into a runtime low-power state. | |
969 | */ | |
970 | int acpi_subsys_runtime_suspend(struct device *dev) | |
971 | { | |
972 | int ret = pm_generic_runtime_suspend(dev); | |
cbe25ce3 | 973 | return ret ? ret : acpi_dev_suspend(dev, true); |
e5cc8ef3 RW |
974 | } |
975 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); | |
976 | ||
977 | /** | |
978 | * acpi_subsys_runtime_resume - Resume device using ACPI. | |
979 | * @dev: Device to Resume. | |
980 | * | |
981 | * Use ACPI to put the given device into the full-power state and carry out the | |
982 | * generic runtime resume procedure for it. | |
983 | */ | |
984 | int acpi_subsys_runtime_resume(struct device *dev) | |
985 | { | |
63705c40 | 986 | int ret = acpi_dev_resume(dev); |
e5cc8ef3 RW |
987 | return ret ? ret : pm_generic_runtime_resume(dev); |
988 | } | |
989 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); | |
e5cc8ef3 RW |
990 | |
991 | #ifdef CONFIG_PM_SLEEP | |
c2ebf788 UH |
992 | static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev) |
993 | { | |
994 | u32 sys_target = acpi_target_system_state(); | |
995 | int ret, state; | |
996 | ||
9a51c6b1 RW |
997 | if (!pm_runtime_suspended(dev) || !adev || (adev->wakeup.flags.valid && |
998 | device_may_wakeup(dev) != !!adev->wakeup.prepare_count)) | |
c2ebf788 UH |
999 | return true; |
1000 | ||
1001 | if (sys_target == ACPI_STATE_S0) | |
1002 | return false; | |
1003 | ||
1004 | if (adev->power.flags.dsw_present) | |
1005 | return true; | |
1006 | ||
1007 | ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); | |
1008 | if (ret) | |
1009 | return true; | |
1010 | ||
1011 | return state != adev->power.state; | |
1012 | } | |
1013 | ||
e5cc8ef3 RW |
1014 | /** |
1015 | * acpi_subsys_prepare - Prepare device for system transition to a sleep state. | |
1016 | * @dev: Device to prepare. | |
1017 | */ | |
1018 | int acpi_subsys_prepare(struct device *dev) | |
1019 | { | |
f25c0ae2 | 1020 | struct acpi_device *adev = ACPI_COMPANION(dev); |
f25c0ae2 | 1021 | |
08810a41 RW |
1022 | if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) { |
1023 | int ret = dev->driver->pm->prepare(dev); | |
f25c0ae2 | 1024 | |
08810a41 RW |
1025 | if (ret < 0) |
1026 | return ret; | |
1027 | ||
1028 | if (!ret && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE)) | |
1029 | return 0; | |
1030 | } | |
f25c0ae2 | 1031 | |
c2ebf788 | 1032 | return !acpi_dev_needs_resume(dev, adev); |
e5cc8ef3 RW |
1033 | } |
1034 | EXPORT_SYMBOL_GPL(acpi_subsys_prepare); | |
1035 | ||
e4da817d UH |
1036 | /** |
1037 | * acpi_subsys_complete - Finalize device's resume during system resume. | |
1038 | * @dev: Device to handle. | |
1039 | */ | |
1040 | void acpi_subsys_complete(struct device *dev) | |
1041 | { | |
1042 | pm_generic_complete(dev); | |
1043 | /* | |
1044 | * If the device had been runtime-suspended before the system went into | |
1045 | * the sleep state it is going out of and it has never been resumed till | |
1046 | * now, resume it in case the firmware powered it up. | |
1047 | */ | |
db68daff | 1048 | if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) |
e4da817d UH |
1049 | pm_request_resume(dev); |
1050 | } | |
1051 | EXPORT_SYMBOL_GPL(acpi_subsys_complete); | |
1052 | ||
92858c47 RW |
1053 | /** |
1054 | * acpi_subsys_suspend - Run the device driver's suspend callback. | |
1055 | * @dev: Device to handle. | |
1056 | * | |
05087360 RW |
1057 | * Follow PCI and resume devices from runtime suspend before running their |
1058 | * system suspend callbacks, unless the driver can cope with runtime-suspended | |
1059 | * devices during system suspend and there are no ACPI-specific reasons for | |
1060 | * resuming them. | |
92858c47 RW |
1061 | */ |
1062 | int acpi_subsys_suspend(struct device *dev) | |
1063 | { | |
05087360 RW |
1064 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || |
1065 | acpi_dev_needs_resume(dev, ACPI_COMPANION(dev))) | |
1066 | pm_runtime_resume(dev); | |
1067 | ||
92858c47 RW |
1068 | return pm_generic_suspend(dev); |
1069 | } | |
4cf563c5 | 1070 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend); |
92858c47 | 1071 | |
e5cc8ef3 RW |
1072 | /** |
1073 | * acpi_subsys_suspend_late - Suspend device using ACPI. | |
1074 | * @dev: Device to suspend. | |
1075 | * | |
1076 | * Carry out the generic late suspend procedure for @dev and use ACPI to put | |
1077 | * it into a low-power state during system transition into a sleep state. | |
1078 | */ | |
1079 | int acpi_subsys_suspend_late(struct device *dev) | |
1080 | { | |
05087360 RW |
1081 | int ret; |
1082 | ||
1083 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1084 | return 0; | |
1085 | ||
1086 | ret = pm_generic_suspend_late(dev); | |
cbe25ce3 | 1087 | return ret ? ret : acpi_dev_suspend(dev, device_may_wakeup(dev)); |
e5cc8ef3 RW |
1088 | } |
1089 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); | |
1090 | ||
05087360 RW |
1091 | /** |
1092 | * acpi_subsys_suspend_noirq - Run the device driver's "noirq" suspend callback. | |
1093 | * @dev: Device to suspend. | |
1094 | */ | |
1095 | int acpi_subsys_suspend_noirq(struct device *dev) | |
1096 | { | |
db68daff RW |
1097 | int ret; |
1098 | ||
1099 | if (dev_pm_smart_suspend_and_suspended(dev)) { | |
1100 | dev->power.may_skip_resume = true; | |
05087360 | 1101 | return 0; |
db68daff RW |
1102 | } |
1103 | ||
1104 | ret = pm_generic_suspend_noirq(dev); | |
1105 | if (ret) | |
1106 | return ret; | |
05087360 | 1107 | |
db68daff RW |
1108 | /* |
1109 | * If the target system sleep state is suspend-to-idle, it is sufficient | |
1110 | * to check whether or not the device's wakeup settings are good for | |
1111 | * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause | |
1112 | * acpi_subsys_complete() to take care of fixing up the device's state | |
1113 | * anyway, if need be. | |
1114 | */ | |
1115 | dev->power.may_skip_resume = device_may_wakeup(dev) || | |
1116 | !device_can_wakeup(dev); | |
1117 | ||
1118 | return 0; | |
05087360 RW |
1119 | } |
1120 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq); | |
1121 | ||
1122 | /** | |
1123 | * acpi_subsys_resume_noirq - Run the device driver's "noirq" resume callback. | |
1124 | * @dev: Device to handle. | |
1125 | */ | |
3cd7957e | 1126 | static int acpi_subsys_resume_noirq(struct device *dev) |
05087360 | 1127 | { |
db68daff RW |
1128 | if (dev_pm_may_skip_resume(dev)) |
1129 | return 0; | |
1130 | ||
05087360 RW |
1131 | /* |
1132 | * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend | |
1133 | * during system suspend, so update their runtime PM status to "active" | |
1134 | * as they will be put into D0 going forward. | |
1135 | */ | |
1136 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1137 | pm_runtime_set_active(dev); | |
1138 | ||
1139 | return pm_generic_resume_noirq(dev); | |
1140 | } | |
05087360 | 1141 | |
e5cc8ef3 RW |
1142 | /** |
1143 | * acpi_subsys_resume_early - Resume device using ACPI. | |
1144 | * @dev: Device to Resume. | |
1145 | * | |
1146 | * Use ACPI to put the given device into the full-power state and carry out the | |
1147 | * generic early resume procedure for it during system transition into the | |
1148 | * working state. | |
1149 | */ | |
3cd7957e | 1150 | static int acpi_subsys_resume_early(struct device *dev) |
e5cc8ef3 | 1151 | { |
63705c40 | 1152 | int ret = acpi_dev_resume(dev); |
e5cc8ef3 RW |
1153 | return ret ? ret : pm_generic_resume_early(dev); |
1154 | } | |
92858c47 RW |
1155 | |
1156 | /** | |
1157 | * acpi_subsys_freeze - Run the device driver's freeze callback. | |
1158 | * @dev: Device to handle. | |
1159 | */ | |
1160 | int acpi_subsys_freeze(struct device *dev) | |
1161 | { | |
1162 | /* | |
501debd4 RW |
1163 | * Resume all runtime-suspended devices before creating a snapshot |
1164 | * image of system memory, because the restore kernel generally cannot | |
1165 | * be expected to always handle them consistently and they need to be | |
1166 | * put into the runtime-active metastate during system resume anyway, | |
1167 | * so it is better to ensure that the state saved in the image will be | |
1168 | * always consistent with that. | |
92858c47 | 1169 | */ |
501debd4 | 1170 | pm_runtime_resume(dev); |
05087360 | 1171 | |
92858c47 RW |
1172 | return pm_generic_freeze(dev); |
1173 | } | |
4cf563c5 | 1174 | EXPORT_SYMBOL_GPL(acpi_subsys_freeze); |
92858c47 | 1175 | |
05087360 | 1176 | /** |
3cd7957e RW |
1177 | * acpi_subsys_restore_early - Restore device using ACPI. |
1178 | * @dev: Device to restore. | |
05087360 | 1179 | */ |
3cd7957e | 1180 | int acpi_subsys_restore_early(struct device *dev) |
05087360 | 1181 | { |
3cd7957e RW |
1182 | int ret = acpi_dev_resume(dev); |
1183 | return ret ? ret : pm_generic_restore_early(dev); | |
05087360 | 1184 | } |
3cd7957e | 1185 | EXPORT_SYMBOL_GPL(acpi_subsys_restore_early); |
05087360 | 1186 | |
c95b7595 RW |
1187 | /** |
1188 | * acpi_subsys_poweroff - Run the device driver's poweroff callback. | |
1189 | * @dev: Device to handle. | |
1190 | * | |
1191 | * Follow PCI and resume devices from runtime suspend before running their | |
1192 | * system poweroff callbacks, unless the driver can cope with runtime-suspended | |
1193 | * devices during system suspend and there are no ACPI-specific reasons for | |
1194 | * resuming them. | |
1195 | */ | |
1196 | int acpi_subsys_poweroff(struct device *dev) | |
1197 | { | |
1198 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || | |
1199 | acpi_dev_needs_resume(dev, ACPI_COMPANION(dev))) | |
1200 | pm_runtime_resume(dev); | |
05087360 | 1201 | |
c95b7595 | 1202 | return pm_generic_poweroff(dev); |
05087360 | 1203 | } |
c95b7595 | 1204 | EXPORT_SYMBOL_GPL(acpi_subsys_poweroff); |
05087360 RW |
1205 | |
1206 | /** | |
c95b7595 | 1207 | * acpi_subsys_poweroff_late - Run the device driver's poweroff callback. |
05087360 | 1208 | * @dev: Device to handle. |
c95b7595 RW |
1209 | * |
1210 | * Carry out the generic late poweroff procedure for @dev and use ACPI to put | |
1211 | * it into a low-power state during system transition into a sleep state. | |
05087360 | 1212 | */ |
c95b7595 | 1213 | static int acpi_subsys_poweroff_late(struct device *dev) |
05087360 | 1214 | { |
c95b7595 | 1215 | int ret; |
05087360 RW |
1216 | |
1217 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1218 | return 0; | |
1219 | ||
c95b7595 RW |
1220 | ret = pm_generic_poweroff_late(dev); |
1221 | if (ret) | |
1222 | return ret; | |
1223 | ||
1224 | return acpi_dev_suspend(dev, device_may_wakeup(dev)); | |
05087360 | 1225 | } |
05087360 RW |
1226 | |
1227 | /** | |
c95b7595 RW |
1228 | * acpi_subsys_poweroff_noirq - Run the driver's "noirq" poweroff callback. |
1229 | * @dev: Device to suspend. | |
05087360 | 1230 | */ |
c95b7595 | 1231 | static int acpi_subsys_poweroff_noirq(struct device *dev) |
05087360 | 1232 | { |
c95b7595 | 1233 | if (dev_pm_smart_suspend_and_suspended(dev)) |
05087360 | 1234 | return 0; |
05087360 | 1235 | |
c95b7595 | 1236 | return pm_generic_poweroff_noirq(dev); |
05087360 | 1237 | } |
e5cc8ef3 RW |
1238 | #endif /* CONFIG_PM_SLEEP */ |
1239 | ||
1240 | static struct dev_pm_domain acpi_general_pm_domain = { | |
1241 | .ops = { | |
e5cc8ef3 RW |
1242 | .runtime_suspend = acpi_subsys_runtime_suspend, |
1243 | .runtime_resume = acpi_subsys_runtime_resume, | |
e5cc8ef3 RW |
1244 | #ifdef CONFIG_PM_SLEEP |
1245 | .prepare = acpi_subsys_prepare, | |
e4da817d | 1246 | .complete = acpi_subsys_complete, |
92858c47 | 1247 | .suspend = acpi_subsys_suspend, |
e5cc8ef3 | 1248 | .suspend_late = acpi_subsys_suspend_late, |
05087360 RW |
1249 | .suspend_noirq = acpi_subsys_suspend_noirq, |
1250 | .resume_noirq = acpi_subsys_resume_noirq, | |
e5cc8ef3 | 1251 | .resume_early = acpi_subsys_resume_early, |
92858c47 | 1252 | .freeze = acpi_subsys_freeze, |
c95b7595 RW |
1253 | .poweroff = acpi_subsys_poweroff, |
1254 | .poweroff_late = acpi_subsys_poweroff_late, | |
1255 | .poweroff_noirq = acpi_subsys_poweroff_noirq, | |
3cd7957e | 1256 | .restore_early = acpi_subsys_restore_early, |
e5cc8ef3 RW |
1257 | #endif |
1258 | }, | |
1259 | }; | |
1260 | ||
91d66cd2 UH |
1261 | /** |
1262 | * acpi_dev_pm_detach - Remove ACPI power management from the device. | |
1263 | * @dev: Device to take care of. | |
1264 | * @power_off: Whether or not to try to remove power from the device. | |
1265 | * | |
1266 | * Remove the device from the general ACPI PM domain and remove its wakeup | |
1267 | * notifier. If @power_off is set, additionally remove power from the device if | |
1268 | * possible. | |
1269 | * | |
1270 | * Callers must ensure proper synchronization of this function with power | |
1271 | * management callbacks. | |
1272 | */ | |
1273 | static void acpi_dev_pm_detach(struct device *dev, bool power_off) | |
1274 | { | |
1275 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1276 | ||
1277 | if (adev && dev->pm_domain == &acpi_general_pm_domain) { | |
989561de | 1278 | dev_pm_domain_set(dev, NULL); |
91d66cd2 UH |
1279 | acpi_remove_pm_notifier(adev); |
1280 | if (power_off) { | |
1281 | /* | |
1282 | * If the device's PM QoS resume latency limit or flags | |
1283 | * have been exposed to user space, they have to be | |
1284 | * hidden at this point, so that they don't affect the | |
1285 | * choice of the low-power state to put the device into. | |
1286 | */ | |
1287 | dev_pm_qos_hide_latency_limit(dev); | |
1288 | dev_pm_qos_hide_flags(dev); | |
99d8845e | 1289 | acpi_device_wakeup_disable(adev); |
91d66cd2 UH |
1290 | acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); |
1291 | } | |
1292 | } | |
1293 | } | |
1294 | ||
e5cc8ef3 RW |
1295 | /** |
1296 | * acpi_dev_pm_attach - Prepare device for ACPI power management. | |
1297 | * @dev: Device to prepare. | |
b88ce2a4 | 1298 | * @power_on: Whether or not to power on the device. |
e5cc8ef3 RW |
1299 | * |
1300 | * If @dev has a valid ACPI handle that has a valid struct acpi_device object | |
1301 | * attached to it, install a wakeup notification handler for the device and | |
b88ce2a4 RW |
1302 | * add it to the general ACPI PM domain. If @power_on is set, the device will |
1303 | * be put into the ACPI D0 state before the function returns. | |
e5cc8ef3 RW |
1304 | * |
1305 | * This assumes that the @dev's bus type uses generic power management callbacks | |
1306 | * (or doesn't use any power management callbacks at all). | |
1307 | * | |
1308 | * Callers must ensure proper synchronization of this function with power | |
1309 | * management callbacks. | |
1310 | */ | |
b88ce2a4 | 1311 | int acpi_dev_pm_attach(struct device *dev, bool power_on) |
e5cc8ef3 | 1312 | { |
eaf3e413 RW |
1313 | /* |
1314 | * Skip devices whose ACPI companions match the device IDs below, | |
1315 | * because they require special power management handling incompatible | |
1316 | * with the generic ACPI PM domain. | |
1317 | */ | |
1318 | static const struct acpi_device_id special_pm_ids[] = { | |
1319 | {"PNP0C0B", }, /* Generic ACPI fan */ | |
1320 | {"INT3404", }, /* Fan */ | |
1321 | {} | |
1322 | }; | |
79c0373f | 1323 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 | 1324 | |
eaf3e413 | 1325 | if (!adev || !acpi_match_device_ids(adev, special_pm_ids)) |
919b7308 | 1326 | return 0; |
e5cc8ef3 | 1327 | |
712e960f MW |
1328 | /* |
1329 | * Only attach the power domain to the first device if the | |
1330 | * companion is shared by multiple. This is to prevent doing power | |
1331 | * management twice. | |
1332 | */ | |
1333 | if (!acpi_device_is_first_physical_node(adev, dev)) | |
919b7308 | 1334 | return 0; |
712e960f | 1335 | |
c072530f | 1336 | acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); |
989561de | 1337 | dev_pm_domain_set(dev, &acpi_general_pm_domain); |
b88ce2a4 RW |
1338 | if (power_on) { |
1339 | acpi_dev_pm_full_power(adev); | |
99d8845e | 1340 | acpi_device_wakeup_disable(adev); |
b88ce2a4 | 1341 | } |
86f1e15f UH |
1342 | |
1343 | dev->pm_domain->detach = acpi_dev_pm_detach; | |
919b7308 | 1344 | return 1; |
e5cc8ef3 RW |
1345 | } |
1346 | EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); | |
ec4602a9 | 1347 | #endif /* CONFIG_PM */ |