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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 | ||
255a04cc | 13 | #define pr_fmt(fmt) "PM: " fmt |
c56fd5ea | 14 | |
7b199811 | 15 | #include <linux/acpi.h> |
86b3832c | 16 | #include <linux/export.h> |
ec2cd81c | 17 | #include <linux/mutex.h> |
86b3832c | 18 | #include <linux/pm_qos.h> |
989561de | 19 | #include <linux/pm_domain.h> |
cd7bd02d | 20 | #include <linux/pm_runtime.h> |
33e4f80e | 21 | #include <linux/suspend.h> |
ec2cd81c | 22 | |
b9370dce | 23 | #include "fan.h" |
9ce4e607 RW |
24 | #include "internal.h" |
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; | |
d5008ef5 | 78 | struct acpi_device *parent; |
f850a48a | 79 | int error; |
9ce4e607 RW |
80 | |
81 | if (!device || !state) | |
82 | return -EINVAL; | |
83 | ||
d5008ef5 RW |
84 | parent = acpi_dev_parent(device); |
85 | ||
9ce4e607 RW |
86 | if (!device->flags.power_manageable) { |
87 | /* TBD: Non-recursive algorithm for walking up hierarchy. */ | |
62fcb99b | 88 | *state = parent ? parent->power.state : ACPI_STATE_D0; |
9ce4e607 RW |
89 | goto out; |
90 | } | |
91 | ||
92 | /* | |
75eb2d13 RW |
93 | * Get the device's power state from power resources settings and _PSC, |
94 | * if available. | |
9ce4e607 | 95 | */ |
75eb2d13 | 96 | if (device->power.flags.power_resources) { |
f850a48a | 97 | error = acpi_power_get_inferred_state(device, &result); |
75eb2d13 RW |
98 | if (error) |
99 | return error; | |
100 | } | |
9ce4e607 | 101 | if (device->power.flags.explicit_get) { |
f850a48a | 102 | int psc; |
75eb2d13 | 103 | |
f850a48a RW |
104 | error = acpi_dev_pm_explicit_get(device, &psc); |
105 | if (error) | |
106 | return error; | |
9ce4e607 | 107 | |
75eb2d13 RW |
108 | /* |
109 | * The power resources settings may indicate a power state | |
20dacb71 RW |
110 | * shallower than the actual power state of the device, because |
111 | * the same power resources may be referenced by other devices. | |
75eb2d13 | 112 | * |
20dacb71 RW |
113 | * For systems predating ACPI 4.0 we assume that D3hot is the |
114 | * deepest state that can be supported. | |
75eb2d13 RW |
115 | */ |
116 | if (psc > result && psc < ACPI_STATE_D3_COLD) | |
117 | result = psc; | |
118 | else if (result == ACPI_STATE_UNKNOWN) | |
20dacb71 | 119 | result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc; |
9ce4e607 RW |
120 | } |
121 | ||
122 | /* | |
123 | * If we were unsure about the device parent's power state up to this | |
124 | * point, the fact that the device is in D0 implies that the parent has | |
644f17ad | 125 | * to be in D0 too, except if ignore_parent is set. |
9ce4e607 | 126 | */ |
62fcb99b RW |
127 | if (!device->power.flags.ignore_parent && parent && |
128 | parent->power.state == ACPI_STATE_UNKNOWN && | |
129 | result == ACPI_STATE_D0) | |
130 | parent->power.state = ACPI_STATE_D0; | |
9ce4e607 RW |
131 | |
132 | *state = result; | |
133 | ||
134 | out: | |
198ee437 RW |
135 | acpi_handle_debug(device->handle, "Power state: %s\n", |
136 | acpi_power_state_string(*state)); | |
9ce4e607 RW |
137 | |
138 | return 0; | |
139 | } | |
140 | ||
9c0f45e3 RW |
141 | static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) |
142 | { | |
143 | if (adev->power.states[state].flags.explicit_set) { | |
144 | char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; | |
145 | acpi_status status; | |
146 | ||
147 | status = acpi_evaluate_object(adev->handle, method, NULL, NULL); | |
148 | if (ACPI_FAILURE(status)) | |
149 | return -ENODEV; | |
150 | } | |
151 | return 0; | |
152 | } | |
153 | ||
9ce4e607 RW |
154 | /** |
155 | * acpi_device_set_power - Set power state of an ACPI device. | |
156 | * @device: Device to set the power state of. | |
157 | * @state: New power state to set. | |
158 | * | |
159 | * Callers must ensure that the device is power manageable before using this | |
160 | * function. | |
161 | */ | |
162 | int acpi_device_set_power(struct acpi_device *device, int state) | |
163 | { | |
20dacb71 | 164 | int target_state = state; |
9ce4e607 | 165 | int result = 0; |
9ce4e607 | 166 | |
2c7d132a RW |
167 | if (!device || !device->flags.power_manageable |
168 | || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) | |
9ce4e607 RW |
169 | return -EINVAL; |
170 | ||
ee8193ee RW |
171 | acpi_handle_debug(device->handle, "Power state change: %s -> %s\n", |
172 | acpi_power_state_string(device->power.state), | |
173 | acpi_power_state_string(state)); | |
174 | ||
9ce4e607 RW |
175 | /* Make sure this is a valid target state */ |
176 | ||
f850a48a | 177 | /* There is a special case for D0 addressed below. */ |
6dd4a29d RW |
178 | if (state > ACPI_STATE_D0 && state == device->power.state) |
179 | goto no_change; | |
9ce4e607 | 180 | |
20dacb71 RW |
181 | if (state == ACPI_STATE_D3_COLD) { |
182 | /* | |
183 | * For transitions to D3cold we need to execute _PS3 and then | |
184 | * possibly drop references to the power resources in use. | |
185 | */ | |
186 | state = ACPI_STATE_D3_HOT; | |
956ad9d9 | 187 | /* If D3cold is not supported, use D3hot as the target state. */ |
20dacb71 RW |
188 | if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) |
189 | target_state = state; | |
190 | } else if (!device->power.states[state].flags.valid) { | |
f4f3548d RW |
191 | acpi_handle_debug(device->handle, "Power state %s not supported\n", |
192 | acpi_power_state_string(state)); | |
9ce4e607 RW |
193 | return -ENODEV; |
194 | } | |
20dacb71 | 195 | |
d5008ef5 RW |
196 | if (!device->power.flags.ignore_parent) { |
197 | struct acpi_device *parent; | |
198 | ||
199 | parent = acpi_dev_parent(device); | |
200 | if (parent && state < parent->power.state) { | |
201 | acpi_handle_debug(device->handle, | |
202 | "Cannot transition to %s for parent in %s\n", | |
203 | acpi_power_state_string(state), | |
204 | acpi_power_state_string(parent->power.state)); | |
205 | return -ENODEV; | |
206 | } | |
9ce4e607 RW |
207 | } |
208 | ||
9ce4e607 RW |
209 | /* |
210 | * Transition Power | |
211 | * ---------------- | |
20dacb71 RW |
212 | * In accordance with ACPI 6, _PSx is executed before manipulating power |
213 | * resources, unless the target state is D0, in which case _PS0 is | |
214 | * supposed to be executed after turning the power resources on. | |
9ce4e607 | 215 | */ |
20dacb71 RW |
216 | if (state > ACPI_STATE_D0) { |
217 | /* | |
218 | * According to ACPI 6, devices cannot go from lower-power | |
219 | * (deeper) states to higher-power (shallower) states. | |
220 | */ | |
221 | if (state < device->power.state) { | |
f4f3548d RW |
222 | acpi_handle_debug(device->handle, |
223 | "Cannot transition from %s to %s\n", | |
224 | acpi_power_state_string(device->power.state), | |
225 | acpi_power_state_string(state)); | |
20dacb71 RW |
226 | return -ENODEV; |
227 | } | |
228 | ||
21ba2379 RW |
229 | /* |
230 | * If the device goes from D3hot to D3cold, _PS3 has been | |
231 | * evaluated for it already, so skip it in that case. | |
232 | */ | |
233 | if (device->power.state < ACPI_STATE_D3_HOT) { | |
234 | result = acpi_dev_pm_explicit_set(device, state); | |
235 | if (result) | |
236 | goto end; | |
237 | } | |
9ce4e607 | 238 | |
20dacb71 RW |
239 | if (device->power.flags.power_resources) |
240 | result = acpi_power_transition(device, target_state); | |
241 | } else { | |
42787ed7 RW |
242 | int cur_state = device->power.state; |
243 | ||
20dacb71 RW |
244 | if (device->power.flags.power_resources) { |
245 | result = acpi_power_transition(device, ACPI_STATE_D0); | |
246 | if (result) | |
247 | goto end; | |
248 | } | |
f850a48a | 249 | |
42787ed7 | 250 | if (cur_state == ACPI_STATE_D0) { |
f850a48a RW |
251 | int psc; |
252 | ||
253 | /* Nothing to do here if _PSC is not present. */ | |
254 | if (!device->power.flags.explicit_get) | |
6dd4a29d | 255 | goto no_change; |
f850a48a RW |
256 | |
257 | /* | |
258 | * The power state of the device was set to D0 last | |
259 | * time, but that might have happened before a | |
260 | * system-wide transition involving the platform | |
261 | * firmware, so it may be necessary to evaluate _PS0 | |
262 | * for the device here. However, use extra care here | |
263 | * and evaluate _PSC to check the device's current power | |
264 | * state, and only invoke _PS0 if the evaluation of _PSC | |
265 | * is successful and it returns a power state different | |
266 | * from D0. | |
267 | */ | |
268 | result = acpi_dev_pm_explicit_get(device, &psc); | |
269 | if (result || psc == ACPI_STATE_D0) | |
6dd4a29d | 270 | goto no_change; |
f850a48a RW |
271 | } |
272 | ||
20dacb71 | 273 | result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); |
e5656271 | 274 | } |
9ce4e607 | 275 | |
6dd4a29d | 276 | end: |
e78adb75 | 277 | if (result) { |
f4f3548d RW |
278 | acpi_handle_debug(device->handle, |
279 | "Failed to change power state to %s\n", | |
280 | acpi_power_state_string(target_state)); | |
e78adb75 | 281 | } else { |
71b65445 | 282 | device->power.state = target_state; |
f4f3548d RW |
283 | acpi_handle_debug(device->handle, "Power state changed to %s\n", |
284 | acpi_power_state_string(target_state)); | |
9ce4e607 RW |
285 | } |
286 | ||
287 | return result; | |
6dd4a29d RW |
288 | |
289 | no_change: | |
290 | acpi_handle_debug(device->handle, "Already in %s\n", | |
291 | acpi_power_state_string(state)); | |
292 | return 0; | |
9ce4e607 RW |
293 | } |
294 | EXPORT_SYMBOL(acpi_device_set_power); | |
295 | ||
296 | int acpi_bus_set_power(acpi_handle handle, int state) | |
297 | { | |
99ece713 | 298 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
9ce4e607 | 299 | |
99ece713 RW |
300 | if (device) |
301 | return acpi_device_set_power(device, state); | |
9ce4e607 | 302 | |
99ece713 | 303 | return -ENODEV; |
9ce4e607 RW |
304 | } |
305 | EXPORT_SYMBOL(acpi_bus_set_power); | |
306 | ||
307 | int acpi_bus_init_power(struct acpi_device *device) | |
308 | { | |
309 | int state; | |
310 | int result; | |
311 | ||
312 | if (!device) | |
313 | return -EINVAL; | |
314 | ||
315 | device->power.state = ACPI_STATE_UNKNOWN; | |
cde1f95f SA |
316 | if (!acpi_device_is_present(device)) { |
317 | device->flags.initialized = false; | |
1b1f3e16 | 318 | return -ENXIO; |
cde1f95f | 319 | } |
9ce4e607 RW |
320 | |
321 | result = acpi_device_get_power(device, &state); | |
322 | if (result) | |
323 | return result; | |
324 | ||
a2367807 | 325 | if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { |
20dacb71 | 326 | /* Reference count the power resources. */ |
9ce4e607 | 327 | result = acpi_power_on_resources(device, state); |
a2367807 RW |
328 | if (result) |
329 | return result; | |
9ce4e607 | 330 | |
20dacb71 RW |
331 | if (state == ACPI_STATE_D0) { |
332 | /* | |
333 | * If _PSC is not present and the state inferred from | |
334 | * power resources appears to be D0, it still may be | |
335 | * necessary to execute _PS0 at this point, because | |
336 | * another device using the same power resources may | |
337 | * have been put into D0 previously and that's why we | |
338 | * see D0 here. | |
339 | */ | |
340 | result = acpi_dev_pm_explicit_set(device, state); | |
341 | if (result) | |
342 | return result; | |
343 | } | |
b3785492 | 344 | } else if (state == ACPI_STATE_UNKNOWN) { |
7cd8407d RW |
345 | /* |
346 | * No power resources and missing _PSC? Cross fingers and make | |
347 | * it D0 in hope that this is what the BIOS put the device into. | |
348 | * [We tried to force D0 here by executing _PS0, but that broke | |
349 | * Toshiba P870-303 in a nasty way.] | |
350 | */ | |
b3785492 | 351 | state = ACPI_STATE_D0; |
a2367807 RW |
352 | } |
353 | device->power.state = state; | |
354 | return 0; | |
9ce4e607 RW |
355 | } |
356 | ||
b9e95fc6 RW |
357 | /** |
358 | * acpi_device_fix_up_power - Force device with missing _PSC into D0. | |
359 | * @device: Device object whose power state is to be fixed up. | |
360 | * | |
361 | * Devices without power resources and _PSC, but having _PS0 and _PS3 defined, | |
362 | * are assumed to be put into D0 by the BIOS. However, in some cases that may | |
363 | * not be the case and this function should be used then. | |
364 | */ | |
365 | int acpi_device_fix_up_power(struct acpi_device *device) | |
366 | { | |
367 | int ret = 0; | |
368 | ||
369 | if (!device->power.flags.power_resources | |
370 | && !device->power.flags.explicit_get | |
371 | && device->power.state == ACPI_STATE_D0) | |
372 | ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); | |
373 | ||
374 | return ret; | |
375 | } | |
78a898d0 | 376 | EXPORT_SYMBOL_GPL(acpi_device_fix_up_power); |
b9e95fc6 | 377 | |
a22f18bd RW |
378 | static int fix_up_power_if_applicable(struct acpi_device *adev, void *not_used) |
379 | { | |
380 | if (adev->status.present && adev->status.enabled) | |
381 | acpi_device_fix_up_power(adev); | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | /** | |
387 | * acpi_device_fix_up_power_extended - Force device and its children into D0. | |
388 | * @adev: Parent device object whose power state is to be fixed up. | |
389 | * | |
390 | * Call acpi_device_fix_up_power() for @adev and its children so long as they | |
391 | * are reported as present and enabled. | |
392 | */ | |
393 | void acpi_device_fix_up_power_extended(struct acpi_device *adev) | |
394 | { | |
395 | acpi_device_fix_up_power(adev); | |
396 | acpi_dev_for_each_child(adev, fix_up_power_if_applicable, NULL); | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_extended); | |
399 | ||
37ba91a8 HG |
400 | /** |
401 | * acpi_device_fix_up_power_children - Force a device's children into D0. | |
402 | * @adev: Parent device object whose children's power state is to be fixed up. | |
403 | * | |
404 | * Call acpi_device_fix_up_power() for @adev's children so long as they | |
405 | * are reported as present and enabled. | |
406 | */ | |
407 | void acpi_device_fix_up_power_children(struct acpi_device *adev) | |
408 | { | |
409 | acpi_dev_for_each_child(adev, fix_up_power_if_applicable, NULL); | |
410 | } | |
411 | EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_children); | |
412 | ||
202317a5 | 413 | int acpi_device_update_power(struct acpi_device *device, int *state_p) |
9ce4e607 | 414 | { |
9ce4e607 RW |
415 | int state; |
416 | int result; | |
417 | ||
202317a5 RW |
418 | if (device->power.state == ACPI_STATE_UNKNOWN) { |
419 | result = acpi_bus_init_power(device); | |
420 | if (!result && state_p) | |
421 | *state_p = device->power.state; | |
422 | ||
9ce4e607 | 423 | return result; |
202317a5 | 424 | } |
9ce4e607 RW |
425 | |
426 | result = acpi_device_get_power(device, &state); | |
427 | if (result) | |
428 | return result; | |
429 | ||
91bdad0b | 430 | if (state == ACPI_STATE_UNKNOWN) { |
511d5c42 | 431 | state = ACPI_STATE_D0; |
91bdad0b RW |
432 | result = acpi_device_set_power(device, state); |
433 | if (result) | |
434 | return result; | |
435 | } else { | |
436 | if (device->power.flags.power_resources) { | |
437 | /* | |
438 | * We don't need to really switch the state, bu we need | |
439 | * to update the power resources' reference counters. | |
440 | */ | |
441 | result = acpi_power_transition(device, state); | |
442 | if (result) | |
443 | return result; | |
444 | } | |
445 | device->power.state = state; | |
446 | } | |
447 | if (state_p) | |
9ce4e607 RW |
448 | *state_p = state; |
449 | ||
91bdad0b | 450 | return 0; |
9ce4e607 | 451 | } |
2bb3a2bf | 452 | EXPORT_SYMBOL_GPL(acpi_device_update_power); |
202317a5 RW |
453 | |
454 | int acpi_bus_update_power(acpi_handle handle, int *state_p) | |
455 | { | |
99ece713 | 456 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
202317a5 | 457 | |
99ece713 RW |
458 | if (device) |
459 | return acpi_device_update_power(device, state_p); | |
460 | ||
461 | return -ENODEV; | |
202317a5 | 462 | } |
9ce4e607 RW |
463 | EXPORT_SYMBOL_GPL(acpi_bus_update_power); |
464 | ||
465 | bool acpi_bus_power_manageable(acpi_handle handle) | |
466 | { | |
99ece713 | 467 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
9ce4e607 | 468 | |
99ece713 | 469 | return device && device->flags.power_manageable; |
9ce4e607 RW |
470 | } |
471 | EXPORT_SYMBOL(acpi_bus_power_manageable); | |
472 | ||
10fa1b2c | 473 | static int acpi_power_up_if_adr_present(struct acpi_device *adev, void *not_used) |
b7dd6298 | 474 | { |
b7dd6298 RW |
475 | if (!(adev->flags.power_manageable && adev->pnp.type.bus_address)) |
476 | return 0; | |
477 | ||
478 | acpi_handle_debug(adev->handle, "Power state: %s\n", | |
479 | acpi_power_state_string(adev->power.state)); | |
480 | ||
481 | if (adev->power.state == ACPI_STATE_D3_COLD) | |
482 | return acpi_device_set_power(adev, ACPI_STATE_D0); | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | /** | |
488 | * acpi_dev_power_up_children_with_adr - Power up childres with valid _ADR | |
489 | * @adev: Parent ACPI device object. | |
490 | * | |
491 | * Change the power states of the direct children of @adev that are in D3cold | |
492 | * and hold valid _ADR objects to D0 in order to allow bus (e.g. PCI) | |
493 | * enumeration code to access them. | |
494 | */ | |
495 | void acpi_dev_power_up_children_with_adr(struct acpi_device *adev) | |
496 | { | |
497 | acpi_dev_for_each_child(adev, acpi_power_up_if_adr_present, NULL); | |
498 | } | |
499 | ||
8133844a RW |
500 | /** |
501 | * acpi_dev_power_state_for_wake - Deepest power state for wakeup signaling | |
502 | * @adev: ACPI companion of the target device. | |
503 | * | |
504 | * Evaluate _S0W for @adev and return the value produced by it or return | |
505 | * ACPI_STATE_UNKNOWN on errors (including _S0W not present). | |
506 | */ | |
507 | u8 acpi_dev_power_state_for_wake(struct acpi_device *adev) | |
508 | { | |
509 | unsigned long long state; | |
510 | acpi_status status; | |
511 | ||
512 | status = acpi_evaluate_integer(adev->handle, "_S0W", NULL, &state); | |
513 | if (ACPI_FAILURE(status)) | |
514 | return ACPI_STATE_UNKNOWN; | |
515 | ||
516 | return state; | |
517 | } | |
518 | ||
ec4602a9 RW |
519 | #ifdef CONFIG_PM |
520 | static DEFINE_MUTEX(acpi_pm_notifier_lock); | |
ff165679 | 521 | static DEFINE_MUTEX(acpi_pm_notifier_install_lock); |
ec4602a9 | 522 | |
33e4f80e RW |
523 | void acpi_pm_wakeup_event(struct device *dev) |
524 | { | |
525 | pm_wakeup_dev_event(dev, 0, acpi_s2idle_wakeup()); | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(acpi_pm_wakeup_event); | |
528 | ||
c072530f RW |
529 | static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) |
530 | { | |
531 | struct acpi_device *adev; | |
532 | ||
533 | if (val != ACPI_NOTIFY_DEVICE_WAKE) | |
534 | return; | |
535 | ||
020a6375 RW |
536 | acpi_handle_debug(handle, "Wake notify\n"); |
537 | ||
45e9aa1f | 538 | adev = acpi_get_acpi_dev(handle); |
c072530f RW |
539 | if (!adev) |
540 | return; | |
541 | ||
542 | mutex_lock(&acpi_pm_notifier_lock); | |
543 | ||
544 | if (adev->wakeup.flags.notifier_present) { | |
33e4f80e | 545 | pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup()); |
020a6375 | 546 | if (adev->wakeup.context.func) { |
d75f773c | 547 | acpi_handle_debug(handle, "Running %pS for %s\n", |
020a6375 RW |
548 | adev->wakeup.context.func, |
549 | dev_name(adev->wakeup.context.dev)); | |
64fd1c70 | 550 | adev->wakeup.context.func(&adev->wakeup.context); |
020a6375 | 551 | } |
c072530f RW |
552 | } |
553 | ||
554 | mutex_unlock(&acpi_pm_notifier_lock); | |
555 | ||
45e9aa1f | 556 | acpi_put_acpi_dev(adev); |
c072530f RW |
557 | } |
558 | ||
ec4602a9 | 559 | /** |
c072530f RW |
560 | * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. |
561 | * @adev: ACPI device to add the notify handler for. | |
562 | * @dev: Device to generate a wakeup event for while handling the notification. | |
64fd1c70 | 563 | * @func: Work function to execute when handling the notification. |
ec4602a9 RW |
564 | * |
565 | * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of | |
566 | * PM wakeup events. For example, wakeup events may be generated for bridges | |
567 | * if one of the devices below the bridge is signaling wakeup, even if the | |
568 | * bridge itself doesn't have a wakeup GPE associated with it. | |
569 | */ | |
c072530f | 570 | acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, |
64fd1c70 | 571 | void (*func)(struct acpi_device_wakeup_context *context)) |
ec4602a9 RW |
572 | { |
573 | acpi_status status = AE_ALREADY_EXISTS; | |
574 | ||
64fd1c70 | 575 | if (!dev && !func) |
c072530f RW |
576 | return AE_BAD_PARAMETER; |
577 | ||
ff165679 | 578 | mutex_lock(&acpi_pm_notifier_install_lock); |
ec4602a9 RW |
579 | |
580 | if (adev->wakeup.flags.notifier_present) | |
581 | goto out; | |
582 | ||
c072530f RW |
583 | status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, |
584 | acpi_pm_notify_handler, NULL); | |
ec4602a9 RW |
585 | if (ACPI_FAILURE(status)) |
586 | goto out; | |
587 | ||
ff165679 | 588 | mutex_lock(&acpi_pm_notifier_lock); |
c8377adf TV |
589 | adev->wakeup.ws = wakeup_source_register(&adev->dev, |
590 | dev_name(&adev->dev)); | |
ff165679 VS |
591 | adev->wakeup.context.dev = dev; |
592 | adev->wakeup.context.func = func; | |
ec4602a9 | 593 | adev->wakeup.flags.notifier_present = true; |
ff165679 | 594 | mutex_unlock(&acpi_pm_notifier_lock); |
ec4602a9 RW |
595 | |
596 | out: | |
ff165679 | 597 | mutex_unlock(&acpi_pm_notifier_install_lock); |
ec4602a9 RW |
598 | return status; |
599 | } | |
600 | ||
601 | /** | |
602 | * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
603 | * @adev: ACPI device to remove the notifier from. | |
604 | */ | |
c072530f | 605 | acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) |
ec4602a9 RW |
606 | { |
607 | acpi_status status = AE_BAD_PARAMETER; | |
608 | ||
ff165679 | 609 | mutex_lock(&acpi_pm_notifier_install_lock); |
ec4602a9 RW |
610 | |
611 | if (!adev->wakeup.flags.notifier_present) | |
612 | goto out; | |
613 | ||
614 | status = acpi_remove_notify_handler(adev->handle, | |
615 | ACPI_SYSTEM_NOTIFY, | |
c072530f | 616 | acpi_pm_notify_handler); |
ec4602a9 RW |
617 | if (ACPI_FAILURE(status)) |
618 | goto out; | |
619 | ||
ff165679 | 620 | mutex_lock(&acpi_pm_notifier_lock); |
64fd1c70 | 621 | adev->wakeup.context.func = NULL; |
c072530f RW |
622 | adev->wakeup.context.dev = NULL; |
623 | wakeup_source_unregister(adev->wakeup.ws); | |
ec4602a9 | 624 | adev->wakeup.flags.notifier_present = false; |
ff165679 | 625 | mutex_unlock(&acpi_pm_notifier_lock); |
ec4602a9 RW |
626 | |
627 | out: | |
ff165679 | 628 | mutex_unlock(&acpi_pm_notifier_install_lock); |
ec4602a9 RW |
629 | return status; |
630 | } | |
631 | ||
9ce4e607 RW |
632 | bool acpi_bus_can_wakeup(acpi_handle handle) |
633 | { | |
99ece713 | 634 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
9ce4e607 | 635 | |
99ece713 | 636 | return device && device->wakeup.flags.valid; |
9ce4e607 RW |
637 | } |
638 | EXPORT_SYMBOL(acpi_bus_can_wakeup); | |
639 | ||
8370c2dc RW |
640 | bool acpi_pm_device_can_wakeup(struct device *dev) |
641 | { | |
642 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
643 | ||
644 | return adev ? acpi_device_can_wakeup(adev) : false; | |
645 | } | |
646 | ||
86b3832c | 647 | /** |
b25c77ef | 648 | * acpi_dev_pm_get_state - Get preferred power state of ACPI device. |
86b3832c RW |
649 | * @dev: Device whose preferred target power state to return. |
650 | * @adev: ACPI device node corresponding to @dev. | |
651 | * @target_state: System state to match the resultant device state. | |
fa1675b5 RW |
652 | * @d_min_p: Location to store the highest power state available to the device. |
653 | * @d_max_p: Location to store the lowest power state available to the device. | |
86b3832c | 654 | * |
fa1675b5 RW |
655 | * Find the lowest power (highest number) and highest power (lowest number) ACPI |
656 | * device power states that the device can be in while the system is in the | |
657 | * state represented by @target_state. Store the integer numbers representing | |
658 | * those stats in the memory locations pointed to by @d_max_p and @d_min_p, | |
659 | * respectively. | |
86b3832c RW |
660 | * |
661 | * Callers must ensure that @dev and @adev are valid pointers and that @adev | |
662 | * actually corresponds to @dev before using this function. | |
fa1675b5 RW |
663 | * |
664 | * Returns 0 on success or -ENODATA when one of the ACPI methods fails or | |
665 | * returns a value that doesn't make sense. The memory locations pointed to by | |
666 | * @d_max_p and @d_min_p are only modified on success. | |
86b3832c | 667 | */ |
b25c77ef | 668 | static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, |
fa1675b5 | 669 | u32 target_state, int *d_min_p, int *d_max_p) |
86b3832c | 670 | { |
fa1675b5 RW |
671 | char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; |
672 | acpi_handle handle = adev->handle; | |
673 | unsigned long long ret; | |
674 | int d_min, d_max; | |
86b3832c | 675 | bool wakeup = false; |
bf8c6184 | 676 | bool has_sxd = false; |
fa1675b5 | 677 | acpi_status status; |
86b3832c | 678 | |
86b3832c | 679 | /* |
fa1675b5 RW |
680 | * If the system state is S0, the lowest power state the device can be |
681 | * in is D3cold, unless the device has _S0W and is supposed to signal | |
682 | * wakeup, in which case the return value of _S0W has to be used as the | |
683 | * lowest power state available to the device. | |
86b3832c RW |
684 | */ |
685 | d_min = ACPI_STATE_D0; | |
4c164ae7 | 686 | d_max = ACPI_STATE_D3_COLD; |
86b3832c RW |
687 | |
688 | /* | |
689 | * If present, _SxD methods return the minimum D-state (highest power | |
690 | * state) we can use for the corresponding S-states. Otherwise, the | |
691 | * minimum D-state is D0 (ACPI 3.x). | |
86b3832c RW |
692 | */ |
693 | if (target_state > ACPI_STATE_S0) { | |
fa1675b5 RW |
694 | /* |
695 | * We rely on acpi_evaluate_integer() not clobbering the integer | |
696 | * provided if AE_NOT_FOUND is returned. | |
697 | */ | |
698 | ret = d_min; | |
699 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
700 | if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) | |
701 | || ret > ACPI_STATE_D3_COLD) | |
702 | return -ENODATA; | |
703 | ||
704 | /* | |
705 | * We need to handle legacy systems where D3hot and D3cold are | |
706 | * the same and 3 is returned in both cases, so fall back to | |
707 | * D3cold if D3hot is not a valid state. | |
708 | */ | |
709 | if (!adev->power.states[ret].flags.valid) { | |
710 | if (ret == ACPI_STATE_D3_HOT) | |
711 | ret = ACPI_STATE_D3_COLD; | |
712 | else | |
713 | return -ENODATA; | |
714 | } | |
bf8c6184 DD |
715 | |
716 | if (status == AE_OK) | |
717 | has_sxd = true; | |
718 | ||
fa1675b5 | 719 | d_min = ret; |
86b3832c RW |
720 | wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid |
721 | && adev->wakeup.sleep_state >= target_state; | |
a6c05e12 RR |
722 | } else if (device_may_wakeup(dev) && dev->power.wakeirq) { |
723 | /* | |
724 | * The ACPI subsystem doesn't manage the wake bit for IRQs | |
725 | * defined with ExclusiveAndWake and SharedAndWake. Instead we | |
726 | * expect them to be managed via the PM subsystem. Drivers | |
727 | * should call dev_pm_set_wake_irq to register an IRQ as a wake | |
728 | * source. | |
729 | * | |
730 | * If a device has a wake IRQ attached we need to check the | |
731 | * _S0W method to get the correct wake D-state. Otherwise we | |
732 | * end up putting the device into D3Cold which will more than | |
733 | * likely disable wake functionality. | |
734 | */ | |
735 | wakeup = true; | |
20f97caf | 736 | } else { |
a6c05e12 | 737 | /* ACPI GPE is specified in _PRW. */ |
86b3832c RW |
738 | wakeup = adev->wakeup.flags.valid; |
739 | } | |
740 | ||
741 | /* | |
742 | * If _PRW says we can wake up the system from the target sleep state, | |
743 | * the D-state returned by _SxD is sufficient for that (we assume a | |
744 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
745 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
746 | * can wake the system. _S0W may be valid, too. | |
747 | */ | |
748 | if (wakeup) { | |
fa1675b5 RW |
749 | method[3] = 'W'; |
750 | status = acpi_evaluate_integer(handle, method, NULL, &ret); | |
751 | if (status == AE_NOT_FOUND) { | |
bf8c6184 DD |
752 | /* No _SxW. In this case, the ACPI spec says that we |
753 | * must not go into any power state deeper than the | |
754 | * value returned from _SxD. | |
755 | */ | |
756 | if (has_sxd && target_state > ACPI_STATE_S0) | |
86b3832c | 757 | d_max = d_min; |
fa1675b5 RW |
758 | } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { |
759 | /* Fall back to D3cold if ret is not a valid state. */ | |
760 | if (!adev->power.states[ret].flags.valid) | |
761 | ret = ACPI_STATE_D3_COLD; | |
762 | ||
763 | d_max = ret > d_min ? ret : d_min; | |
764 | } else { | |
765 | return -ENODATA; | |
86b3832c RW |
766 | } |
767 | } | |
768 | ||
86b3832c RW |
769 | if (d_min_p) |
770 | *d_min_p = d_min; | |
fa1675b5 RW |
771 | |
772 | if (d_max_p) | |
773 | *d_max_p = d_max; | |
774 | ||
775 | return 0; | |
86b3832c | 776 | } |
cd7bd02d | 777 | |
a6ae7594 RW |
778 | /** |
779 | * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. | |
780 | * @dev: Device whose preferred target power state to return. | |
781 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
782 | * @d_max_in: Deepest low-power state to take into consideration. | |
783 | * Return value: Preferred power state of the device on success, -ENODEV | |
fa1675b5 RW |
784 | * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is |
785 | * incorrect, or -ENODATA on ACPI method failure. | |
a6ae7594 RW |
786 | * |
787 | * The caller must ensure that @dev is valid before using this function. | |
788 | */ | |
789 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) | |
790 | { | |
a6ae7594 | 791 | struct acpi_device *adev; |
9b5c7a5a | 792 | int ret, d_min, d_max; |
fa1675b5 RW |
793 | |
794 | if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) | |
795 | return -EINVAL; | |
796 | ||
20dacb71 | 797 | if (d_max_in > ACPI_STATE_D2) { |
fa1675b5 RW |
798 | enum pm_qos_flags_status stat; |
799 | ||
800 | stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); | |
801 | if (stat == PM_QOS_FLAGS_ALL) | |
20dacb71 | 802 | d_max_in = ACPI_STATE_D2; |
fa1675b5 | 803 | } |
a6ae7594 | 804 | |
17653a3e RW |
805 | adev = ACPI_COMPANION(dev); |
806 | if (!adev) { | |
807 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
808 | return -ENODEV; |
809 | } | |
810 | ||
fa1675b5 | 811 | ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), |
9b5c7a5a | 812 | &d_min, &d_max); |
fa1675b5 RW |
813 | if (ret) |
814 | return ret; | |
815 | ||
9b5c7a5a | 816 | if (d_max_in < d_min) |
fa1675b5 RW |
817 | return -EINVAL; |
818 | ||
819 | if (d_max > d_max_in) { | |
9b5c7a5a | 820 | for (d_max = d_max_in; d_max > d_min; d_max--) { |
fa1675b5 RW |
821 | if (adev->power.states[d_max].flags.valid) |
822 | break; | |
823 | } | |
824 | } | |
9b5c7a5a RW |
825 | |
826 | if (d_min_p) | |
827 | *d_min_p = d_min; | |
828 | ||
fa1675b5 | 829 | return d_max; |
a6ae7594 RW |
830 | } |
831 | EXPORT_SYMBOL(acpi_pm_device_sleep_state); | |
832 | ||
e5cc8ef3 | 833 | /** |
c072530f | 834 | * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. |
64fd1c70 | 835 | * @context: Device wakeup context. |
e5cc8ef3 | 836 | */ |
64fd1c70 | 837 | static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context) |
e5cc8ef3 | 838 | { |
64fd1c70 | 839 | struct device *dev = context->dev; |
e5cc8ef3 | 840 | |
c072530f | 841 | if (dev) { |
e5cc8ef3 | 842 | pm_wakeup_event(dev, 0); |
64fd1c70 | 843 | pm_request_resume(dev); |
e5cc8ef3 RW |
844 | } |
845 | } | |
846 | ||
99d8845e RW |
847 | static DEFINE_MUTEX(acpi_wakeup_lock); |
848 | ||
1ba51a7c | 849 | static int __acpi_device_wakeup_enable(struct acpi_device *adev, |
7482c5cb | 850 | u32 target_state) |
dee8370c RW |
851 | { |
852 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
99d8845e RW |
853 | acpi_status status; |
854 | int error = 0; | |
dee8370c | 855 | |
99d8845e | 856 | mutex_lock(&acpi_wakeup_lock); |
dee8370c | 857 | |
b93b7ef6 RW |
858 | /* |
859 | * If the device wakeup power is already enabled, disable it and enable | |
860 | * it again in case it depends on the configuration of subordinate | |
861 | * devices and the conditions have changed since it was enabled last | |
862 | * time. | |
863 | */ | |
1ba51a7c | 864 | if (wakeup->enable_count > 0) |
b93b7ef6 | 865 | acpi_disable_wakeup_device_power(adev); |
1ba51a7c | 866 | |
99d8845e | 867 | error = acpi_enable_wakeup_device_power(adev, target_state); |
b93b7ef6 RW |
868 | if (error) { |
869 | if (wakeup->enable_count > 0) { | |
870 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
871 | wakeup->enable_count = 0; | |
872 | } | |
99d8845e | 873 | goto out; |
b93b7ef6 RW |
874 | } |
875 | ||
876 | if (wakeup->enable_count > 0) | |
877 | goto inc; | |
dee8370c | 878 | |
99d8845e RW |
879 | status = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); |
880 | if (ACPI_FAILURE(status)) { | |
dee8370c | 881 | acpi_disable_wakeup_device_power(adev); |
99d8845e RW |
882 | error = -EIO; |
883 | goto out; | |
dee8370c | 884 | } |
99d8845e | 885 | |
fbc9418f RW |
886 | acpi_handle_debug(adev->handle, "GPE%2X enabled for wakeup\n", |
887 | (unsigned int)wakeup->gpe_number); | |
888 | ||
1ba51a7c | 889 | inc: |
b93b7ef6 RW |
890 | if (wakeup->enable_count < INT_MAX) |
891 | wakeup->enable_count++; | |
892 | else | |
893 | acpi_handle_info(adev->handle, "Wakeup enable count out of bounds!\n"); | |
99d8845e RW |
894 | |
895 | out: | |
896 | mutex_unlock(&acpi_wakeup_lock); | |
897 | return error; | |
898 | } | |
899 | ||
1ba51a7c RW |
900 | /** |
901 | * acpi_device_wakeup_enable - Enable wakeup functionality for device. | |
902 | * @adev: ACPI device to enable wakeup functionality for. | |
903 | * @target_state: State the system is transitioning into. | |
904 | * | |
905 | * Enable the GPE associated with @adev so that it can generate wakeup signals | |
906 | * for the device in response to external (remote) events and enable wakeup | |
907 | * power for it. | |
908 | * | |
909 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
910 | * this function. | |
911 | */ | |
912 | static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state) | |
913 | { | |
7482c5cb | 914 | return __acpi_device_wakeup_enable(adev, target_state); |
1ba51a7c RW |
915 | } |
916 | ||
99d8845e RW |
917 | /** |
918 | * acpi_device_wakeup_disable - Disable wakeup functionality for device. | |
919 | * @adev: ACPI device to disable wakeup functionality for. | |
920 | * | |
921 | * Disable the GPE associated with @adev and disable wakeup power for it. | |
922 | * | |
923 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
924 | * this function. | |
925 | */ | |
926 | static void acpi_device_wakeup_disable(struct acpi_device *adev) | |
927 | { | |
928 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
929 | ||
930 | mutex_lock(&acpi_wakeup_lock); | |
931 | ||
932 | if (!wakeup->enable_count) | |
933 | goto out; | |
934 | ||
935 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
936 | acpi_disable_wakeup_device_power(adev); | |
937 | ||
938 | wakeup->enable_count--; | |
939 | ||
940 | out: | |
941 | mutex_unlock(&acpi_wakeup_lock); | |
dee8370c RW |
942 | } |
943 | ||
7482c5cb RW |
944 | /** |
945 | * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device. | |
946 | * @dev: Device to enable/disable to generate wakeup events. | |
947 | * @enable: Whether to enable or disable the wakeup functionality. | |
948 | */ | |
949 | int acpi_pm_set_device_wakeup(struct device *dev, bool enable) | |
a6ae7594 | 950 | { |
a6ae7594 RW |
951 | struct acpi_device *adev; |
952 | int error; | |
953 | ||
17653a3e RW |
954 | adev = ACPI_COMPANION(dev); |
955 | if (!adev) { | |
956 | dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); | |
a6ae7594 RW |
957 | return -ENODEV; |
958 | } | |
959 | ||
4d183d04 RW |
960 | if (!acpi_device_can_wakeup(adev)) |
961 | return -EINVAL; | |
962 | ||
99d8845e RW |
963 | if (!enable) { |
964 | acpi_device_wakeup_disable(adev); | |
965 | dev_dbg(dev, "Wakeup disabled by ACPI\n"); | |
966 | return 0; | |
967 | } | |
968 | ||
7482c5cb | 969 | error = __acpi_device_wakeup_enable(adev, acpi_target_system_state()); |
a6ae7594 | 970 | if (!error) |
99d8845e | 971 | dev_dbg(dev, "Wakeup enabled by ACPI\n"); |
a6ae7594 RW |
972 | |
973 | return error; | |
974 | } | |
1ba51a7c RW |
975 | EXPORT_SYMBOL_GPL(acpi_pm_set_device_wakeup); |
976 | ||
e5cc8ef3 RW |
977 | /** |
978 | * acpi_dev_pm_low_power - Put ACPI device into a low-power state. | |
979 | * @dev: Device to put into a low-power state. | |
980 | * @adev: ACPI device node corresponding to @dev. | |
981 | * @system_state: System state to choose the device state for. | |
982 | */ | |
983 | static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, | |
984 | u32 system_state) | |
985 | { | |
fa1675b5 | 986 | int ret, state; |
e5cc8ef3 RW |
987 | |
988 | if (!acpi_device_power_manageable(adev)) | |
989 | return 0; | |
990 | ||
fa1675b5 RW |
991 | ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); |
992 | return ret ? ret : acpi_device_set_power(adev, state); | |
e5cc8ef3 RW |
993 | } |
994 | ||
995 | /** | |
996 | * acpi_dev_pm_full_power - Put ACPI device into the full-power state. | |
997 | * @adev: ACPI device node to put into the full-power state. | |
998 | */ | |
999 | static int acpi_dev_pm_full_power(struct acpi_device *adev) | |
1000 | { | |
1001 | return acpi_device_power_manageable(adev) ? | |
1002 | acpi_device_set_power(adev, ACPI_STATE_D0) : 0; | |
1003 | } | |
1004 | ||
e5cc8ef3 | 1005 | /** |
cbe25ce3 | 1006 | * acpi_dev_suspend - Put device into a low-power state using ACPI. |
e5cc8ef3 | 1007 | * @dev: Device to put into a low-power state. |
cbe25ce3 | 1008 | * @wakeup: Whether or not to enable wakeup for the device. |
e5cc8ef3 | 1009 | * |
cbe25ce3 | 1010 | * Put the given device into a low-power state using the standard ACPI |
e5cc8ef3 RW |
1011 | * mechanism. Set up remote wakeup if desired, choose the state to put the |
1012 | * device into (this checks if remote wakeup is expected to work too), and set | |
1013 | * the power state of the device. | |
1014 | */ | |
cbe25ce3 | 1015 | int acpi_dev_suspend(struct device *dev, bool wakeup) |
e5cc8ef3 | 1016 | { |
79c0373f | 1017 | struct acpi_device *adev = ACPI_COMPANION(dev); |
cbe25ce3 | 1018 | u32 target_state = acpi_target_system_state(); |
e5cc8ef3 RW |
1019 | int error; |
1020 | ||
1021 | if (!adev) | |
1022 | return 0; | |
1023 | ||
cbe25ce3 RW |
1024 | if (wakeup && acpi_device_can_wakeup(adev)) { |
1025 | error = acpi_device_wakeup_enable(adev, target_state); | |
99d8845e RW |
1026 | if (error) |
1027 | return -EAGAIN; | |
cbe25ce3 RW |
1028 | } else { |
1029 | wakeup = false; | |
99d8845e | 1030 | } |
e5cc8ef3 | 1031 | |
cbe25ce3 RW |
1032 | error = acpi_dev_pm_low_power(dev, adev, target_state); |
1033 | if (error && wakeup) | |
99d8845e | 1034 | acpi_device_wakeup_disable(adev); |
e5cc8ef3 RW |
1035 | |
1036 | return error; | |
1037 | } | |
cbe25ce3 | 1038 | EXPORT_SYMBOL_GPL(acpi_dev_suspend); |
e5cc8ef3 RW |
1039 | |
1040 | /** | |
63705c40 | 1041 | * acpi_dev_resume - Put device into the full-power state using ACPI. |
e5cc8ef3 RW |
1042 | * @dev: Device to put into the full-power state. |
1043 | * | |
1044 | * Put the given device into the full-power state using the standard ACPI | |
63705c40 | 1045 | * mechanism. Set the power state of the device to ACPI D0 and disable wakeup. |
e5cc8ef3 | 1046 | */ |
63705c40 | 1047 | int acpi_dev_resume(struct device *dev) |
e5cc8ef3 | 1048 | { |
79c0373f | 1049 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 RW |
1050 | int error; |
1051 | ||
1052 | if (!adev) | |
1053 | return 0; | |
1054 | ||
1055 | error = acpi_dev_pm_full_power(adev); | |
99d8845e | 1056 | acpi_device_wakeup_disable(adev); |
e5cc8ef3 RW |
1057 | return error; |
1058 | } | |
63705c40 | 1059 | EXPORT_SYMBOL_GPL(acpi_dev_resume); |
e5cc8ef3 RW |
1060 | |
1061 | /** | |
1062 | * acpi_subsys_runtime_suspend - Suspend device using ACPI. | |
1063 | * @dev: Device to suspend. | |
1064 | * | |
1065 | * Carry out the generic runtime suspend procedure for @dev and use ACPI to put | |
1066 | * it into a runtime low-power state. | |
1067 | */ | |
1068 | int acpi_subsys_runtime_suspend(struct device *dev) | |
1069 | { | |
1070 | int ret = pm_generic_runtime_suspend(dev); | |
3da8236b | 1071 | |
cbe25ce3 | 1072 | return ret ? ret : acpi_dev_suspend(dev, true); |
e5cc8ef3 RW |
1073 | } |
1074 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); | |
1075 | ||
1076 | /** | |
1077 | * acpi_subsys_runtime_resume - Resume device using ACPI. | |
1078 | * @dev: Device to Resume. | |
1079 | * | |
1080 | * Use ACPI to put the given device into the full-power state and carry out the | |
1081 | * generic runtime resume procedure for it. | |
1082 | */ | |
1083 | int acpi_subsys_runtime_resume(struct device *dev) | |
1084 | { | |
63705c40 | 1085 | int ret = acpi_dev_resume(dev); |
3da8236b | 1086 | |
e5cc8ef3 RW |
1087 | return ret ? ret : pm_generic_runtime_resume(dev); |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); | |
e5cc8ef3 RW |
1090 | |
1091 | #ifdef CONFIG_PM_SLEEP | |
c2ebf788 UH |
1092 | static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev) |
1093 | { | |
1094 | u32 sys_target = acpi_target_system_state(); | |
1095 | int ret, state; | |
1096 | ||
9a51c6b1 RW |
1097 | if (!pm_runtime_suspended(dev) || !adev || (adev->wakeup.flags.valid && |
1098 | device_may_wakeup(dev) != !!adev->wakeup.prepare_count)) | |
c2ebf788 UH |
1099 | return true; |
1100 | ||
1101 | if (sys_target == ACPI_STATE_S0) | |
1102 | return false; | |
1103 | ||
1104 | if (adev->power.flags.dsw_present) | |
1105 | return true; | |
1106 | ||
1107 | ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); | |
1108 | if (ret) | |
1109 | return true; | |
1110 | ||
1111 | return state != adev->power.state; | |
1112 | } | |
1113 | ||
e5cc8ef3 RW |
1114 | /** |
1115 | * acpi_subsys_prepare - Prepare device for system transition to a sleep state. | |
1116 | * @dev: Device to prepare. | |
1117 | */ | |
1118 | int acpi_subsys_prepare(struct device *dev) | |
1119 | { | |
f25c0ae2 | 1120 | struct acpi_device *adev = ACPI_COMPANION(dev); |
f25c0ae2 | 1121 | |
08810a41 RW |
1122 | if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) { |
1123 | int ret = dev->driver->pm->prepare(dev); | |
f25c0ae2 | 1124 | |
08810a41 RW |
1125 | if (ret < 0) |
1126 | return ret; | |
1127 | ||
1128 | if (!ret && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE)) | |
1129 | return 0; | |
1130 | } | |
f25c0ae2 | 1131 | |
c2ebf788 | 1132 | return !acpi_dev_needs_resume(dev, adev); |
e5cc8ef3 RW |
1133 | } |
1134 | EXPORT_SYMBOL_GPL(acpi_subsys_prepare); | |
1135 | ||
e4da817d UH |
1136 | /** |
1137 | * acpi_subsys_complete - Finalize device's resume during system resume. | |
1138 | * @dev: Device to handle. | |
1139 | */ | |
1140 | void acpi_subsys_complete(struct device *dev) | |
1141 | { | |
1142 | pm_generic_complete(dev); | |
1143 | /* | |
1144 | * If the device had been runtime-suspended before the system went into | |
1145 | * the sleep state it is going out of and it has never been resumed till | |
1146 | * now, resume it in case the firmware powered it up. | |
1147 | */ | |
db68daff | 1148 | if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) |
e4da817d UH |
1149 | pm_request_resume(dev); |
1150 | } | |
1151 | EXPORT_SYMBOL_GPL(acpi_subsys_complete); | |
1152 | ||
92858c47 RW |
1153 | /** |
1154 | * acpi_subsys_suspend - Run the device driver's suspend callback. | |
1155 | * @dev: Device to handle. | |
1156 | * | |
05087360 RW |
1157 | * Follow PCI and resume devices from runtime suspend before running their |
1158 | * system suspend callbacks, unless the driver can cope with runtime-suspended | |
1159 | * devices during system suspend and there are no ACPI-specific reasons for | |
1160 | * resuming them. | |
92858c47 RW |
1161 | */ |
1162 | int acpi_subsys_suspend(struct device *dev) | |
1163 | { | |
05087360 RW |
1164 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || |
1165 | acpi_dev_needs_resume(dev, ACPI_COMPANION(dev))) | |
1166 | pm_runtime_resume(dev); | |
1167 | ||
92858c47 RW |
1168 | return pm_generic_suspend(dev); |
1169 | } | |
4cf563c5 | 1170 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend); |
92858c47 | 1171 | |
e5cc8ef3 RW |
1172 | /** |
1173 | * acpi_subsys_suspend_late - Suspend device using ACPI. | |
1174 | * @dev: Device to suspend. | |
1175 | * | |
1176 | * Carry out the generic late suspend procedure for @dev and use ACPI to put | |
1177 | * it into a low-power state during system transition into a sleep state. | |
1178 | */ | |
1179 | int acpi_subsys_suspend_late(struct device *dev) | |
1180 | { | |
05087360 RW |
1181 | int ret; |
1182 | ||
fa2bfead | 1183 | if (dev_pm_skip_suspend(dev)) |
05087360 RW |
1184 | return 0; |
1185 | ||
1186 | ret = pm_generic_suspend_late(dev); | |
cbe25ce3 | 1187 | return ret ? ret : acpi_dev_suspend(dev, device_may_wakeup(dev)); |
e5cc8ef3 RW |
1188 | } |
1189 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); | |
1190 | ||
05087360 RW |
1191 | /** |
1192 | * acpi_subsys_suspend_noirq - Run the device driver's "noirq" suspend callback. | |
1193 | * @dev: Device to suspend. | |
1194 | */ | |
1195 | int acpi_subsys_suspend_noirq(struct device *dev) | |
1196 | { | |
db68daff RW |
1197 | int ret; |
1198 | ||
fa2bfead | 1199 | if (dev_pm_skip_suspend(dev)) |
05087360 | 1200 | return 0; |
db68daff RW |
1201 | |
1202 | ret = pm_generic_suspend_noirq(dev); | |
1203 | if (ret) | |
1204 | return ret; | |
05087360 | 1205 | |
db68daff RW |
1206 | /* |
1207 | * If the target system sleep state is suspend-to-idle, it is sufficient | |
1208 | * to check whether or not the device's wakeup settings are good for | |
1209 | * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause | |
1210 | * acpi_subsys_complete() to take care of fixing up the device's state | |
1211 | * anyway, if need be. | |
1212 | */ | |
0fe8a1be RW |
1213 | if (device_can_wakeup(dev) && !device_may_wakeup(dev)) |
1214 | dev->power.may_skip_resume = false; | |
db68daff RW |
1215 | |
1216 | return 0; | |
05087360 RW |
1217 | } |
1218 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq); | |
1219 | ||
1220 | /** | |
1221 | * acpi_subsys_resume_noirq - Run the device driver's "noirq" resume callback. | |
1222 | * @dev: Device to handle. | |
1223 | */ | |
3cd7957e | 1224 | static int acpi_subsys_resume_noirq(struct device *dev) |
05087360 | 1225 | { |
76c70cb5 | 1226 | if (dev_pm_skip_resume(dev)) |
db68daff RW |
1227 | return 0; |
1228 | ||
05087360 RW |
1229 | return pm_generic_resume_noirq(dev); |
1230 | } | |
05087360 | 1231 | |
e5cc8ef3 RW |
1232 | /** |
1233 | * acpi_subsys_resume_early - Resume device using ACPI. | |
1234 | * @dev: Device to Resume. | |
1235 | * | |
1236 | * Use ACPI to put the given device into the full-power state and carry out the | |
1237 | * generic early resume procedure for it during system transition into the | |
f7599be2 DT |
1238 | * working state, but only do that if device either defines early resume |
1239 | * handler, or does not define power operations at all. Otherwise powering up | |
1240 | * of the device is postponed to the normal resume phase. | |
e5cc8ef3 | 1241 | */ |
3cd7957e | 1242 | static int acpi_subsys_resume_early(struct device *dev) |
e5cc8ef3 | 1243 | { |
f7599be2 | 1244 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
6e176bf8 RW |
1245 | int ret; |
1246 | ||
76c70cb5 | 1247 | if (dev_pm_skip_resume(dev)) |
6e176bf8 RW |
1248 | return 0; |
1249 | ||
f7599be2 DT |
1250 | if (pm && !pm->resume_early) { |
1251 | dev_dbg(dev, "postponing D0 transition to normal resume stage\n"); | |
1252 | return 0; | |
1253 | } | |
1254 | ||
6e176bf8 | 1255 | ret = acpi_dev_resume(dev); |
e5cc8ef3 RW |
1256 | return ret ? ret : pm_generic_resume_early(dev); |
1257 | } | |
92858c47 | 1258 | |
f7599be2 DT |
1259 | /** |
1260 | * acpi_subsys_resume - Resume device using ACPI. | |
1261 | * @dev: Device to Resume. | |
1262 | * | |
1263 | * Use ACPI to put the given device into the full-power state if it has not been | |
1264 | * powered up during early resume phase, and carry out the generic resume | |
1265 | * procedure for it during system transition into the working state. | |
1266 | */ | |
1267 | static int acpi_subsys_resume(struct device *dev) | |
1268 | { | |
1269 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1270 | int ret = 0; | |
1271 | ||
1272 | if (!dev_pm_skip_resume(dev) && pm && !pm->resume_early) { | |
1273 | dev_dbg(dev, "executing postponed D0 transition\n"); | |
1274 | ret = acpi_dev_resume(dev); | |
1275 | } | |
1276 | ||
1277 | return ret ? ret : pm_generic_resume(dev); | |
1278 | } | |
1279 | ||
92858c47 RW |
1280 | /** |
1281 | * acpi_subsys_freeze - Run the device driver's freeze callback. | |
1282 | * @dev: Device to handle. | |
1283 | */ | |
1284 | int acpi_subsys_freeze(struct device *dev) | |
1285 | { | |
1286 | /* | |
501debd4 RW |
1287 | * Resume all runtime-suspended devices before creating a snapshot |
1288 | * image of system memory, because the restore kernel generally cannot | |
1289 | * be expected to always handle them consistently and they need to be | |
1290 | * put into the runtime-active metastate during system resume anyway, | |
1291 | * so it is better to ensure that the state saved in the image will be | |
1292 | * always consistent with that. | |
92858c47 | 1293 | */ |
501debd4 | 1294 | pm_runtime_resume(dev); |
05087360 | 1295 | |
92858c47 RW |
1296 | return pm_generic_freeze(dev); |
1297 | } | |
4cf563c5 | 1298 | EXPORT_SYMBOL_GPL(acpi_subsys_freeze); |
92858c47 | 1299 | |
05087360 | 1300 | /** |
3cd7957e RW |
1301 | * acpi_subsys_restore_early - Restore device using ACPI. |
1302 | * @dev: Device to restore. | |
05087360 | 1303 | */ |
3cd7957e | 1304 | int acpi_subsys_restore_early(struct device *dev) |
05087360 | 1305 | { |
3cd7957e | 1306 | int ret = acpi_dev_resume(dev); |
3da8236b | 1307 | |
3cd7957e | 1308 | return ret ? ret : pm_generic_restore_early(dev); |
05087360 | 1309 | } |
3cd7957e | 1310 | EXPORT_SYMBOL_GPL(acpi_subsys_restore_early); |
05087360 | 1311 | |
c95b7595 RW |
1312 | /** |
1313 | * acpi_subsys_poweroff - Run the device driver's poweroff callback. | |
1314 | * @dev: Device to handle. | |
1315 | * | |
1316 | * Follow PCI and resume devices from runtime suspend before running their | |
1317 | * system poweroff callbacks, unless the driver can cope with runtime-suspended | |
1318 | * devices during system suspend and there are no ACPI-specific reasons for | |
1319 | * resuming them. | |
1320 | */ | |
1321 | int acpi_subsys_poweroff(struct device *dev) | |
1322 | { | |
1323 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || | |
1324 | acpi_dev_needs_resume(dev, ACPI_COMPANION(dev))) | |
1325 | pm_runtime_resume(dev); | |
05087360 | 1326 | |
c95b7595 | 1327 | return pm_generic_poweroff(dev); |
05087360 | 1328 | } |
c95b7595 | 1329 | EXPORT_SYMBOL_GPL(acpi_subsys_poweroff); |
05087360 RW |
1330 | |
1331 | /** | |
c95b7595 | 1332 | * acpi_subsys_poweroff_late - Run the device driver's poweroff callback. |
05087360 | 1333 | * @dev: Device to handle. |
c95b7595 RW |
1334 | * |
1335 | * Carry out the generic late poweroff procedure for @dev and use ACPI to put | |
1336 | * it into a low-power state during system transition into a sleep state. | |
05087360 | 1337 | */ |
c95b7595 | 1338 | static int acpi_subsys_poweroff_late(struct device *dev) |
05087360 | 1339 | { |
c95b7595 | 1340 | int ret; |
05087360 | 1341 | |
fa2bfead | 1342 | if (dev_pm_skip_suspend(dev)) |
05087360 RW |
1343 | return 0; |
1344 | ||
c95b7595 RW |
1345 | ret = pm_generic_poweroff_late(dev); |
1346 | if (ret) | |
1347 | return ret; | |
1348 | ||
1349 | return acpi_dev_suspend(dev, device_may_wakeup(dev)); | |
05087360 | 1350 | } |
05087360 RW |
1351 | |
1352 | /** | |
c95b7595 RW |
1353 | * acpi_subsys_poweroff_noirq - Run the driver's "noirq" poweroff callback. |
1354 | * @dev: Device to suspend. | |
05087360 | 1355 | */ |
c95b7595 | 1356 | static int acpi_subsys_poweroff_noirq(struct device *dev) |
05087360 | 1357 | { |
fa2bfead | 1358 | if (dev_pm_skip_suspend(dev)) |
05087360 | 1359 | return 0; |
05087360 | 1360 | |
c95b7595 | 1361 | return pm_generic_poweroff_noirq(dev); |
05087360 | 1362 | } |
e5cc8ef3 RW |
1363 | #endif /* CONFIG_PM_SLEEP */ |
1364 | ||
1365 | static struct dev_pm_domain acpi_general_pm_domain = { | |
1366 | .ops = { | |
e5cc8ef3 RW |
1367 | .runtime_suspend = acpi_subsys_runtime_suspend, |
1368 | .runtime_resume = acpi_subsys_runtime_resume, | |
e5cc8ef3 RW |
1369 | #ifdef CONFIG_PM_SLEEP |
1370 | .prepare = acpi_subsys_prepare, | |
e4da817d | 1371 | .complete = acpi_subsys_complete, |
92858c47 | 1372 | .suspend = acpi_subsys_suspend, |
f7599be2 | 1373 | .resume = acpi_subsys_resume, |
e5cc8ef3 | 1374 | .suspend_late = acpi_subsys_suspend_late, |
05087360 RW |
1375 | .suspend_noirq = acpi_subsys_suspend_noirq, |
1376 | .resume_noirq = acpi_subsys_resume_noirq, | |
e5cc8ef3 | 1377 | .resume_early = acpi_subsys_resume_early, |
92858c47 | 1378 | .freeze = acpi_subsys_freeze, |
c95b7595 RW |
1379 | .poweroff = acpi_subsys_poweroff, |
1380 | .poweroff_late = acpi_subsys_poweroff_late, | |
1381 | .poweroff_noirq = acpi_subsys_poweroff_noirq, | |
3cd7957e | 1382 | .restore_early = acpi_subsys_restore_early, |
e5cc8ef3 RW |
1383 | #endif |
1384 | }, | |
1385 | }; | |
1386 | ||
91d66cd2 UH |
1387 | /** |
1388 | * acpi_dev_pm_detach - Remove ACPI power management from the device. | |
1389 | * @dev: Device to take care of. | |
1390 | * @power_off: Whether or not to try to remove power from the device. | |
1391 | * | |
1392 | * Remove the device from the general ACPI PM domain and remove its wakeup | |
1393 | * notifier. If @power_off is set, additionally remove power from the device if | |
1394 | * possible. | |
1395 | * | |
1396 | * Callers must ensure proper synchronization of this function with power | |
1397 | * management callbacks. | |
1398 | */ | |
1399 | static void acpi_dev_pm_detach(struct device *dev, bool power_off) | |
1400 | { | |
1401 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1402 | ||
1403 | if (adev && dev->pm_domain == &acpi_general_pm_domain) { | |
989561de | 1404 | dev_pm_domain_set(dev, NULL); |
91d66cd2 UH |
1405 | acpi_remove_pm_notifier(adev); |
1406 | if (power_off) { | |
1407 | /* | |
1408 | * If the device's PM QoS resume latency limit or flags | |
1409 | * have been exposed to user space, they have to be | |
1410 | * hidden at this point, so that they don't affect the | |
1411 | * choice of the low-power state to put the device into. | |
1412 | */ | |
1413 | dev_pm_qos_hide_latency_limit(dev); | |
1414 | dev_pm_qos_hide_flags(dev); | |
99d8845e | 1415 | acpi_device_wakeup_disable(adev); |
91d66cd2 UH |
1416 | acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); |
1417 | } | |
1418 | } | |
1419 | } | |
1420 | ||
e5cc8ef3 RW |
1421 | /** |
1422 | * acpi_dev_pm_attach - Prepare device for ACPI power management. | |
1423 | * @dev: Device to prepare. | |
b88ce2a4 | 1424 | * @power_on: Whether or not to power on the device. |
e5cc8ef3 RW |
1425 | * |
1426 | * If @dev has a valid ACPI handle that has a valid struct acpi_device object | |
1427 | * attached to it, install a wakeup notification handler for the device and | |
b88ce2a4 RW |
1428 | * add it to the general ACPI PM domain. If @power_on is set, the device will |
1429 | * be put into the ACPI D0 state before the function returns. | |
e5cc8ef3 RW |
1430 | * |
1431 | * This assumes that the @dev's bus type uses generic power management callbacks | |
1432 | * (or doesn't use any power management callbacks at all). | |
1433 | * | |
1434 | * Callers must ensure proper synchronization of this function with power | |
1435 | * management callbacks. | |
1436 | */ | |
b88ce2a4 | 1437 | int acpi_dev_pm_attach(struct device *dev, bool power_on) |
e5cc8ef3 | 1438 | { |
b9ea0bae RW |
1439 | /* |
1440 | * Skip devices whose ACPI companions match the device IDs below, | |
1441 | * because they require special power management handling incompatible | |
1442 | * with the generic ACPI PM domain. | |
1443 | */ | |
1444 | static const struct acpi_device_id special_pm_ids[] = { | |
b9370dce | 1445 | ACPI_FAN_DEVICE_IDS, |
b9ea0bae RW |
1446 | {} |
1447 | }; | |
79c0373f | 1448 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e5cc8ef3 | 1449 | |
b9ea0bae | 1450 | if (!adev || !acpi_match_device_ids(adev, special_pm_ids)) |
919b7308 | 1451 | return 0; |
e5cc8ef3 | 1452 | |
712e960f MW |
1453 | /* |
1454 | * Only attach the power domain to the first device if the | |
1455 | * companion is shared by multiple. This is to prevent doing power | |
1456 | * management twice. | |
1457 | */ | |
1458 | if (!acpi_device_is_first_physical_node(adev, dev)) | |
919b7308 | 1459 | return 0; |
712e960f | 1460 | |
c072530f | 1461 | acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); |
989561de | 1462 | dev_pm_domain_set(dev, &acpi_general_pm_domain); |
b88ce2a4 RW |
1463 | if (power_on) { |
1464 | acpi_dev_pm_full_power(adev); | |
99d8845e | 1465 | acpi_device_wakeup_disable(adev); |
b88ce2a4 | 1466 | } |
86f1e15f UH |
1467 | |
1468 | dev->pm_domain->detach = acpi_dev_pm_detach; | |
919b7308 | 1469 | return 1; |
e5cc8ef3 RW |
1470 | } |
1471 | EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); | |
2744d7a0 ML |
1472 | |
1473 | /** | |
1474 | * acpi_storage_d3 - Check if D3 should be used in the suspend path | |
1475 | * @dev: Device to check | |
1476 | * | |
1477 | * Return %true if the platform firmware wants @dev to be programmed | |
1478 | * into D3hot or D3cold (if supported) in the suspend path, or %false | |
1479 | * when there is no specific preference. On some platforms, if this | |
1480 | * hint is ignored, @dev may remain unresponsive after suspending the | |
1481 | * platform as a whole. | |
1482 | * | |
1483 | * Although the property has storage in the name it actually is | |
1484 | * applied to the PCIe slot and plugging in a non-storage device the | |
1485 | * same platform restrictions will likely apply. | |
1486 | */ | |
1487 | bool acpi_storage_d3(struct device *dev) | |
1488 | { | |
1489 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1490 | u8 val; | |
1491 | ||
6485fc18 ML |
1492 | if (force_storage_d3()) |
1493 | return true; | |
1494 | ||
2744d7a0 ML |
1495 | if (!adev) |
1496 | return false; | |
1497 | if (fwnode_property_read_u8(acpi_fwnode_handle(adev), "StorageD3Enable", | |
1498 | &val)) | |
1499 | return false; | |
1500 | return val == 1; | |
1501 | } | |
1502 | EXPORT_SYMBOL_GPL(acpi_storage_d3); | |
1503 | ||
b82a7df4 SA |
1504 | /** |
1505 | * acpi_dev_state_d0 - Tell if the device is in D0 power state | |
1506 | * @dev: Physical device the ACPI power state of which to check | |
1507 | * | |
1508 | * On a system without ACPI, return true. On a system with ACPI, return true if | |
1509 | * the current ACPI power state of the device is D0, or false otherwise. | |
1510 | * | |
1511 | * Note that the power state of a device is not well-defined after it has been | |
1512 | * passed to acpi_device_set_power() and before that function returns, so it is | |
1513 | * not valid to ask for the ACPI power state of the device in that time frame. | |
1514 | * | |
1515 | * This function is intended to be used in a driver's probe or remove | |
0efe92b4 | 1516 | * function. See Documentation/firmware-guide/acpi/non-d0-probe.rst for |
b82a7df4 SA |
1517 | * more information. |
1518 | */ | |
1519 | bool acpi_dev_state_d0(struct device *dev) | |
1520 | { | |
1521 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1522 | ||
1523 | if (!adev) | |
1524 | return true; | |
1525 | ||
1526 | return adev->power.state == ACPI_STATE_D0; | |
1527 | } | |
1528 | EXPORT_SYMBOL_GPL(acpi_dev_state_d0); | |
1529 | ||
ec4602a9 | 1530 | #endif /* CONFIG_PM */ |