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ec2cd81c RW |
1 | /* |
2 | * drivers/acpi/device_pm.c - ACPI device power management routines. | |
3 | * | |
4 | * Copyright (C) 2012, Intel Corp. | |
5 | * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as published | |
11 | * by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
21 | * | |
22 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
23 | */ | |
24 | ||
25 | #include <linux/device.h> | |
86b3832c | 26 | #include <linux/export.h> |
ec2cd81c | 27 | #include <linux/mutex.h> |
86b3832c | 28 | #include <linux/pm_qos.h> |
cd7bd02d | 29 | #include <linux/pm_runtime.h> |
ec2cd81c RW |
30 | |
31 | #include <acpi/acpi.h> | |
32 | #include <acpi/acpi_bus.h> | |
33 | ||
34 | static DEFINE_MUTEX(acpi_pm_notifier_lock); | |
35 | ||
36 | /** | |
37 | * acpi_add_pm_notifier - Register PM notifier for given ACPI device. | |
38 | * @adev: ACPI device to add the notifier for. | |
39 | * @context: Context information to pass to the notifier routine. | |
40 | * | |
41 | * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of | |
42 | * PM wakeup events. For example, wakeup events may be generated for bridges | |
43 | * if one of the devices below the bridge is signaling wakeup, even if the | |
44 | * bridge itself doesn't have a wakeup GPE associated with it. | |
45 | */ | |
46 | acpi_status acpi_add_pm_notifier(struct acpi_device *adev, | |
47 | acpi_notify_handler handler, void *context) | |
48 | { | |
49 | acpi_status status = AE_ALREADY_EXISTS; | |
50 | ||
51 | mutex_lock(&acpi_pm_notifier_lock); | |
52 | ||
53 | if (adev->wakeup.flags.notifier_present) | |
54 | goto out; | |
55 | ||
56 | status = acpi_install_notify_handler(adev->handle, | |
57 | ACPI_SYSTEM_NOTIFY, | |
58 | handler, context); | |
59 | if (ACPI_FAILURE(status)) | |
60 | goto out; | |
61 | ||
62 | adev->wakeup.flags.notifier_present = true; | |
63 | ||
64 | out: | |
65 | mutex_unlock(&acpi_pm_notifier_lock); | |
66 | return status; | |
67 | } | |
68 | ||
69 | /** | |
70 | * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
71 | * @adev: ACPI device to remove the notifier from. | |
72 | */ | |
73 | acpi_status acpi_remove_pm_notifier(struct acpi_device *adev, | |
74 | acpi_notify_handler handler) | |
75 | { | |
76 | acpi_status status = AE_BAD_PARAMETER; | |
77 | ||
78 | mutex_lock(&acpi_pm_notifier_lock); | |
79 | ||
80 | if (!adev->wakeup.flags.notifier_present) | |
81 | goto out; | |
82 | ||
83 | status = acpi_remove_notify_handler(adev->handle, | |
84 | ACPI_SYSTEM_NOTIFY, | |
85 | handler); | |
86 | if (ACPI_FAILURE(status)) | |
87 | goto out; | |
88 | ||
89 | adev->wakeup.flags.notifier_present = false; | |
90 | ||
91 | out: | |
92 | mutex_unlock(&acpi_pm_notifier_lock); | |
93 | return status; | |
94 | } | |
86b3832c RW |
95 | |
96 | /** | |
97 | * acpi_device_power_state - Get preferred power state of ACPI device. | |
98 | * @dev: Device whose preferred target power state to return. | |
99 | * @adev: ACPI device node corresponding to @dev. | |
100 | * @target_state: System state to match the resultant device state. | |
101 | * @d_max_in: Deepest low-power state to take into consideration. | |
102 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
103 | * Return value: Preferred power state of the device on success, -ENODEV | |
104 | * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure | |
105 | * | |
106 | * Find the lowest power (highest number) ACPI device power state that the | |
107 | * device can be in while the system is in the state represented by | |
108 | * @target_state. If @d_min_p is set, the highest power (lowest number) device | |
109 | * power state that @dev can be in for the given system sleep state is stored | |
110 | * at the location pointed to by it. | |
111 | * | |
112 | * Callers must ensure that @dev and @adev are valid pointers and that @adev | |
113 | * actually corresponds to @dev before using this function. | |
114 | */ | |
115 | int acpi_device_power_state(struct device *dev, struct acpi_device *adev, | |
116 | u32 target_state, int d_max_in, int *d_min_p) | |
117 | { | |
118 | char acpi_method[] = "_SxD"; | |
119 | unsigned long long d_min, d_max; | |
120 | bool wakeup = false; | |
121 | ||
122 | if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3) | |
123 | return -EINVAL; | |
124 | ||
125 | if (d_max_in > ACPI_STATE_D3_HOT) { | |
126 | enum pm_qos_flags_status stat; | |
127 | ||
128 | stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); | |
129 | if (stat == PM_QOS_FLAGS_ALL) | |
130 | d_max_in = ACPI_STATE_D3_HOT; | |
131 | } | |
132 | ||
133 | acpi_method[2] = '0' + target_state; | |
134 | /* | |
135 | * If the sleep state is S0, the lowest limit from ACPI is D3, | |
136 | * but if the device has _S0W, we will use the value from _S0W | |
137 | * as the lowest limit from ACPI. Finally, we will constrain | |
138 | * the lowest limit with the specified one. | |
139 | */ | |
140 | d_min = ACPI_STATE_D0; | |
141 | d_max = ACPI_STATE_D3; | |
142 | ||
143 | /* | |
144 | * If present, _SxD methods return the minimum D-state (highest power | |
145 | * state) we can use for the corresponding S-states. Otherwise, the | |
146 | * minimum D-state is D0 (ACPI 3.x). | |
147 | * | |
148 | * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer | |
149 | * provided -- that's our fault recovery, we ignore retval. | |
150 | */ | |
151 | if (target_state > ACPI_STATE_S0) { | |
152 | acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min); | |
153 | wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid | |
154 | && adev->wakeup.sleep_state >= target_state; | |
155 | } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != | |
156 | PM_QOS_FLAGS_NONE) { | |
157 | wakeup = adev->wakeup.flags.valid; | |
158 | } | |
159 | ||
160 | /* | |
161 | * If _PRW says we can wake up the system from the target sleep state, | |
162 | * the D-state returned by _SxD is sufficient for that (we assume a | |
163 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
164 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
165 | * can wake the system. _S0W may be valid, too. | |
166 | */ | |
167 | if (wakeup) { | |
168 | acpi_status status; | |
169 | ||
170 | acpi_method[3] = 'W'; | |
171 | status = acpi_evaluate_integer(adev->handle, acpi_method, NULL, | |
172 | &d_max); | |
173 | if (ACPI_FAILURE(status)) { | |
174 | if (target_state != ACPI_STATE_S0 || | |
175 | status != AE_NOT_FOUND) | |
176 | d_max = d_min; | |
177 | } else if (d_max < d_min) { | |
178 | /* Warn the user of the broken DSDT */ | |
179 | printk(KERN_WARNING "ACPI: Wrong value from %s\n", | |
180 | acpi_method); | |
181 | /* Sanitize it */ | |
182 | d_min = d_max; | |
183 | } | |
184 | } | |
185 | ||
186 | if (d_max_in < d_min) | |
187 | return -EINVAL; | |
188 | if (d_min_p) | |
189 | *d_min_p = d_min; | |
190 | /* constrain d_max with specified lowest limit (max number) */ | |
191 | if (d_max > d_max_in) { | |
192 | for (d_max = d_max_in; d_max > d_min; d_max--) { | |
193 | if (adev->power.states[d_max].flags.valid) | |
194 | break; | |
195 | } | |
196 | } | |
197 | return d_max; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(acpi_device_power_state); | |
cd7bd02d | 200 | |
a6ae7594 RW |
201 | /** |
202 | * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. | |
203 | * @dev: Device whose preferred target power state to return. | |
204 | * @d_min_p: Location to store the upper limit of the allowed states range. | |
205 | * @d_max_in: Deepest low-power state to take into consideration. | |
206 | * Return value: Preferred power state of the device on success, -ENODEV | |
207 | * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure | |
208 | * | |
209 | * The caller must ensure that @dev is valid before using this function. | |
210 | */ | |
211 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) | |
212 | { | |
213 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
214 | struct acpi_device *adev; | |
215 | ||
216 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
217 | dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); | |
218 | return -ENODEV; | |
219 | } | |
220 | ||
221 | return acpi_device_power_state(dev, adev, acpi_target_system_state(), | |
222 | d_max_in, d_min_p); | |
223 | } | |
224 | EXPORT_SYMBOL(acpi_pm_device_sleep_state); | |
225 | ||
cd7bd02d | 226 | #ifdef CONFIG_PM_RUNTIME |
e5cc8ef3 RW |
227 | /** |
228 | * acpi_wakeup_device - Wakeup notification handler for ACPI devices. | |
229 | * @handle: ACPI handle of the device the notification is for. | |
230 | * @event: Type of the signaled event. | |
231 | * @context: Device corresponding to @handle. | |
232 | */ | |
233 | static void acpi_wakeup_device(acpi_handle handle, u32 event, void *context) | |
234 | { | |
235 | struct device *dev = context; | |
236 | ||
237 | if (event == ACPI_NOTIFY_DEVICE_WAKE && dev) { | |
238 | pm_wakeup_event(dev, 0); | |
239 | pm_runtime_resume(dev); | |
240 | } | |
241 | } | |
242 | ||
cd7bd02d | 243 | /** |
dee8370c RW |
244 | * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device. |
245 | * @adev: ACPI device to enable/disable the remote wakeup for. | |
cd7bd02d RW |
246 | * @enable: Whether to enable or disable the wakeup functionality. |
247 | * | |
dee8370c RW |
248 | * Enable/disable the GPE associated with @adev so that it can generate |
249 | * wakeup signals for the device in response to external (remote) events and | |
250 | * enable/disable device wakeup power. | |
251 | * | |
252 | * Callers must ensure that @adev is a valid ACPI device node before executing | |
253 | * this function. | |
254 | */ | |
255 | int __acpi_device_run_wake(struct acpi_device *adev, bool enable) | |
256 | { | |
257 | struct acpi_device_wakeup *wakeup = &adev->wakeup; | |
258 | ||
259 | if (enable) { | |
260 | acpi_status res; | |
261 | int error; | |
262 | ||
263 | error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0); | |
264 | if (error) | |
265 | return error; | |
266 | ||
267 | res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
268 | if (ACPI_FAILURE(res)) { | |
269 | acpi_disable_wakeup_device_power(adev); | |
270 | return -EIO; | |
271 | } | |
272 | } else { | |
273 | acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); | |
274 | acpi_disable_wakeup_device_power(adev); | |
275 | } | |
276 | return 0; | |
277 | } | |
278 | ||
279 | /** | |
280 | * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. | |
281 | * @dev: Device to enable/disable the platform to wake up. | |
282 | * @enable: Whether to enable or disable the wakeup functionality. | |
cd7bd02d RW |
283 | */ |
284 | int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) | |
285 | { | |
dee8370c | 286 | struct acpi_device *adev; |
cd7bd02d RW |
287 | acpi_handle handle; |
288 | ||
289 | if (!device_run_wake(phys_dev)) | |
290 | return -EINVAL; | |
291 | ||
292 | handle = DEVICE_ACPI_HANDLE(phys_dev); | |
dee8370c RW |
293 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { |
294 | dev_dbg(phys_dev, "ACPI handle without context in %s!\n", | |
cd7bd02d RW |
295 | __func__); |
296 | return -ENODEV; | |
297 | } | |
298 | ||
dee8370c | 299 | return __acpi_device_run_wake(adev, enable); |
cd7bd02d RW |
300 | } |
301 | EXPORT_SYMBOL(acpi_pm_device_run_wake); | |
e5cc8ef3 RW |
302 | #else |
303 | static inline void acpi_wakeup_device(acpi_handle handle, u32 event, | |
304 | void *context) {} | |
cd7bd02d | 305 | #endif /* CONFIG_PM_RUNTIME */ |
dee8370c RW |
306 | |
307 | #ifdef CONFIG_PM_SLEEP | |
308 | /** | |
309 | * __acpi_device_sleep_wake - Enable or disable device to wake up the system. | |
310 | * @dev: Device to enable/desible to wake up the system. | |
311 | * @target_state: System state the device is supposed to wake up from. | |
312 | * @enable: Whether to enable or disable @dev to wake up the system. | |
313 | */ | |
314 | int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state, | |
315 | bool enable) | |
316 | { | |
317 | return enable ? | |
318 | acpi_enable_wakeup_device_power(adev, target_state) : | |
319 | acpi_disable_wakeup_device_power(adev); | |
320 | } | |
a6ae7594 RW |
321 | |
322 | /** | |
323 | * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system. | |
324 | * @dev: Device to enable/desible to wake up the system from sleep states. | |
325 | * @enable: Whether to enable or disable @dev to wake up the system. | |
326 | */ | |
327 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
328 | { | |
329 | acpi_handle handle; | |
330 | struct acpi_device *adev; | |
331 | int error; | |
332 | ||
333 | if (!device_can_wakeup(dev)) | |
334 | return -EINVAL; | |
335 | ||
336 | handle = DEVICE_ACPI_HANDLE(dev); | |
337 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
338 | dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); | |
339 | return -ENODEV; | |
340 | } | |
341 | ||
342 | error = __acpi_device_sleep_wake(adev, acpi_target_system_state(), | |
343 | enable); | |
344 | if (!error) | |
345 | dev_info(dev, "System wakeup %s by ACPI\n", | |
346 | enable ? "enabled" : "disabled"); | |
347 | ||
348 | return error; | |
349 | } | |
dee8370c | 350 | #endif /* CONFIG_PM_SLEEP */ |
e5cc8ef3 RW |
351 | |
352 | /** | |
353 | * acpi_dev_pm_get_node - Get ACPI device node for the given physical device. | |
354 | * @dev: Device to get the ACPI node for. | |
355 | */ | |
356 | static struct acpi_device *acpi_dev_pm_get_node(struct device *dev) | |
357 | { | |
358 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
359 | struct acpi_device *adev; | |
360 | ||
361 | return handle && ACPI_SUCCESS(acpi_bus_get_device(handle, &adev)) ? | |
362 | adev : NULL; | |
363 | } | |
364 | ||
365 | /** | |
366 | * acpi_dev_pm_low_power - Put ACPI device into a low-power state. | |
367 | * @dev: Device to put into a low-power state. | |
368 | * @adev: ACPI device node corresponding to @dev. | |
369 | * @system_state: System state to choose the device state for. | |
370 | */ | |
371 | static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, | |
372 | u32 system_state) | |
373 | { | |
374 | int power_state; | |
375 | ||
376 | if (!acpi_device_power_manageable(adev)) | |
377 | return 0; | |
378 | ||
379 | power_state = acpi_device_power_state(dev, adev, system_state, | |
380 | ACPI_STATE_D3, NULL); | |
381 | if (power_state < ACPI_STATE_D0 || power_state > ACPI_STATE_D3) | |
382 | return -EIO; | |
383 | ||
384 | return acpi_device_set_power(adev, power_state); | |
385 | } | |
386 | ||
387 | /** | |
388 | * acpi_dev_pm_full_power - Put ACPI device into the full-power state. | |
389 | * @adev: ACPI device node to put into the full-power state. | |
390 | */ | |
391 | static int acpi_dev_pm_full_power(struct acpi_device *adev) | |
392 | { | |
393 | return acpi_device_power_manageable(adev) ? | |
394 | acpi_device_set_power(adev, ACPI_STATE_D0) : 0; | |
395 | } | |
396 | ||
397 | #ifdef CONFIG_PM_RUNTIME | |
398 | /** | |
399 | * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. | |
400 | * @dev: Device to put into a low-power state. | |
401 | * | |
402 | * Put the given device into a runtime low-power state using the standard ACPI | |
403 | * mechanism. Set up remote wakeup if desired, choose the state to put the | |
404 | * device into (this checks if remote wakeup is expected to work too), and set | |
405 | * the power state of the device. | |
406 | */ | |
407 | int acpi_dev_runtime_suspend(struct device *dev) | |
408 | { | |
409 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
410 | bool remote_wakeup; | |
411 | int error; | |
412 | ||
413 | if (!adev) | |
414 | return 0; | |
415 | ||
416 | remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > | |
417 | PM_QOS_FLAGS_NONE; | |
418 | error = __acpi_device_run_wake(adev, remote_wakeup); | |
419 | if (remote_wakeup && error) | |
420 | return -EAGAIN; | |
421 | ||
422 | error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
423 | if (error) | |
424 | __acpi_device_run_wake(adev, false); | |
425 | ||
426 | return error; | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); | |
429 | ||
430 | /** | |
431 | * acpi_dev_runtime_resume - Put device into the full-power state using ACPI. | |
432 | * @dev: Device to put into the full-power state. | |
433 | * | |
434 | * Put the given device into the full-power state using the standard ACPI | |
435 | * mechanism at run time. Set the power state of the device to ACPI D0 and | |
436 | * disable remote wakeup. | |
437 | */ | |
438 | int acpi_dev_runtime_resume(struct device *dev) | |
439 | { | |
440 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
441 | int error; | |
442 | ||
443 | if (!adev) | |
444 | return 0; | |
445 | ||
446 | error = acpi_dev_pm_full_power(adev); | |
447 | __acpi_device_run_wake(adev, false); | |
448 | return error; | |
449 | } | |
450 | EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); | |
451 | ||
452 | /** | |
453 | * acpi_subsys_runtime_suspend - Suspend device using ACPI. | |
454 | * @dev: Device to suspend. | |
455 | * | |
456 | * Carry out the generic runtime suspend procedure for @dev and use ACPI to put | |
457 | * it into a runtime low-power state. | |
458 | */ | |
459 | int acpi_subsys_runtime_suspend(struct device *dev) | |
460 | { | |
461 | int ret = pm_generic_runtime_suspend(dev); | |
462 | return ret ? ret : acpi_dev_runtime_suspend(dev); | |
463 | } | |
464 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); | |
465 | ||
466 | /** | |
467 | * acpi_subsys_runtime_resume - Resume device using ACPI. | |
468 | * @dev: Device to Resume. | |
469 | * | |
470 | * Use ACPI to put the given device into the full-power state and carry out the | |
471 | * generic runtime resume procedure for it. | |
472 | */ | |
473 | int acpi_subsys_runtime_resume(struct device *dev) | |
474 | { | |
475 | int ret = acpi_dev_runtime_resume(dev); | |
476 | return ret ? ret : pm_generic_runtime_resume(dev); | |
477 | } | |
478 | EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); | |
479 | #endif /* CONFIG_PM_RUNTIME */ | |
480 | ||
481 | #ifdef CONFIG_PM_SLEEP | |
482 | /** | |
483 | * acpi_dev_suspend_late - Put device into a low-power state using ACPI. | |
484 | * @dev: Device to put into a low-power state. | |
485 | * | |
486 | * Put the given device into a low-power state during system transition to a | |
487 | * sleep state using the standard ACPI mechanism. Set up system wakeup if | |
488 | * desired, choose the state to put the device into (this checks if system | |
489 | * wakeup is expected to work too), and set the power state of the device. | |
490 | */ | |
491 | int acpi_dev_suspend_late(struct device *dev) | |
492 | { | |
493 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
494 | u32 target_state; | |
495 | bool wakeup; | |
496 | int error; | |
497 | ||
498 | if (!adev) | |
499 | return 0; | |
500 | ||
501 | target_state = acpi_target_system_state(); | |
502 | wakeup = device_may_wakeup(dev); | |
503 | error = __acpi_device_sleep_wake(adev, target_state, wakeup); | |
504 | if (wakeup && error) | |
505 | return error; | |
506 | ||
507 | error = acpi_dev_pm_low_power(dev, adev, target_state); | |
508 | if (error) | |
509 | __acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false); | |
510 | ||
511 | return error; | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); | |
514 | ||
515 | /** | |
516 | * acpi_dev_resume_early - Put device into the full-power state using ACPI. | |
517 | * @dev: Device to put into the full-power state. | |
518 | * | |
519 | * Put the given device into the full-power state using the standard ACPI | |
520 | * mechanism during system transition to the working state. Set the power | |
521 | * state of the device to ACPI D0 and disable remote wakeup. | |
522 | */ | |
523 | int acpi_dev_resume_early(struct device *dev) | |
524 | { | |
525 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
526 | int error; | |
527 | ||
528 | if (!adev) | |
529 | return 0; | |
530 | ||
531 | error = acpi_dev_pm_full_power(adev); | |
532 | __acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false); | |
533 | return error; | |
534 | } | |
535 | EXPORT_SYMBOL_GPL(acpi_dev_resume_early); | |
536 | ||
537 | /** | |
538 | * acpi_subsys_prepare - Prepare device for system transition to a sleep state. | |
539 | * @dev: Device to prepare. | |
540 | */ | |
541 | int acpi_subsys_prepare(struct device *dev) | |
542 | { | |
543 | /* | |
544 | * Follow PCI and resume devices suspended at run time before running | |
545 | * their system suspend callbacks. | |
546 | */ | |
547 | pm_runtime_resume(dev); | |
548 | return pm_generic_prepare(dev); | |
549 | } | |
550 | EXPORT_SYMBOL_GPL(acpi_subsys_prepare); | |
551 | ||
552 | /** | |
553 | * acpi_subsys_suspend_late - Suspend device using ACPI. | |
554 | * @dev: Device to suspend. | |
555 | * | |
556 | * Carry out the generic late suspend procedure for @dev and use ACPI to put | |
557 | * it into a low-power state during system transition into a sleep state. | |
558 | */ | |
559 | int acpi_subsys_suspend_late(struct device *dev) | |
560 | { | |
561 | int ret = pm_generic_suspend_late(dev); | |
562 | return ret ? ret : acpi_dev_suspend_late(dev); | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); | |
565 | ||
566 | /** | |
567 | * acpi_subsys_resume_early - Resume device using ACPI. | |
568 | * @dev: Device to Resume. | |
569 | * | |
570 | * Use ACPI to put the given device into the full-power state and carry out the | |
571 | * generic early resume procedure for it during system transition into the | |
572 | * working state. | |
573 | */ | |
574 | int acpi_subsys_resume_early(struct device *dev) | |
575 | { | |
576 | int ret = acpi_dev_resume_early(dev); | |
577 | return ret ? ret : pm_generic_resume_early(dev); | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); | |
580 | #endif /* CONFIG_PM_SLEEP */ | |
581 | ||
582 | static struct dev_pm_domain acpi_general_pm_domain = { | |
583 | .ops = { | |
584 | #ifdef CONFIG_PM_RUNTIME | |
585 | .runtime_suspend = acpi_subsys_runtime_suspend, | |
586 | .runtime_resume = acpi_subsys_runtime_resume, | |
587 | .runtime_idle = pm_generic_runtime_idle, | |
588 | #endif | |
589 | #ifdef CONFIG_PM_SLEEP | |
590 | .prepare = acpi_subsys_prepare, | |
591 | .suspend_late = acpi_subsys_suspend_late, | |
592 | .resume_early = acpi_subsys_resume_early, | |
593 | .poweroff_late = acpi_subsys_suspend_late, | |
594 | .restore_early = acpi_subsys_resume_early, | |
595 | #endif | |
596 | }, | |
597 | }; | |
598 | ||
599 | /** | |
600 | * acpi_dev_pm_attach - Prepare device for ACPI power management. | |
601 | * @dev: Device to prepare. | |
b88ce2a4 | 602 | * @power_on: Whether or not to power on the device. |
e5cc8ef3 RW |
603 | * |
604 | * If @dev has a valid ACPI handle that has a valid struct acpi_device object | |
605 | * attached to it, install a wakeup notification handler for the device and | |
b88ce2a4 RW |
606 | * add it to the general ACPI PM domain. If @power_on is set, the device will |
607 | * be put into the ACPI D0 state before the function returns. | |
e5cc8ef3 RW |
608 | * |
609 | * This assumes that the @dev's bus type uses generic power management callbacks | |
610 | * (or doesn't use any power management callbacks at all). | |
611 | * | |
612 | * Callers must ensure proper synchronization of this function with power | |
613 | * management callbacks. | |
614 | */ | |
b88ce2a4 | 615 | int acpi_dev_pm_attach(struct device *dev, bool power_on) |
e5cc8ef3 RW |
616 | { |
617 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
618 | ||
619 | if (!adev) | |
620 | return -ENODEV; | |
621 | ||
622 | if (dev->pm_domain) | |
623 | return -EEXIST; | |
624 | ||
625 | acpi_add_pm_notifier(adev, acpi_wakeup_device, dev); | |
626 | dev->pm_domain = &acpi_general_pm_domain; | |
b88ce2a4 RW |
627 | if (power_on) { |
628 | acpi_dev_pm_full_power(adev); | |
629 | __acpi_device_run_wake(adev, false); | |
630 | } | |
e5cc8ef3 RW |
631 | return 0; |
632 | } | |
633 | EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); | |
634 | ||
635 | /** | |
636 | * acpi_dev_pm_detach - Remove ACPI power management from the device. | |
637 | * @dev: Device to take care of. | |
b88ce2a4 | 638 | * @power_off: Whether or not to try to remove power from the device. |
e5cc8ef3 RW |
639 | * |
640 | * Remove the device from the general ACPI PM domain and remove its wakeup | |
b88ce2a4 RW |
641 | * notifier. If @power_off is set, additionally remove power from the device if |
642 | * possible. | |
e5cc8ef3 RW |
643 | * |
644 | * Callers must ensure proper synchronization of this function with power | |
645 | * management callbacks. | |
646 | */ | |
b88ce2a4 | 647 | void acpi_dev_pm_detach(struct device *dev, bool power_off) |
e5cc8ef3 RW |
648 | { |
649 | struct acpi_device *adev = acpi_dev_pm_get_node(dev); | |
650 | ||
651 | if (adev && dev->pm_domain == &acpi_general_pm_domain) { | |
652 | dev->pm_domain = NULL; | |
653 | acpi_remove_pm_notifier(adev, acpi_wakeup_device); | |
b88ce2a4 RW |
654 | if (power_off) { |
655 | /* | |
656 | * If the device's PM QoS resume latency limit or flags | |
657 | * have been exposed to user space, they have to be | |
658 | * hidden at this point, so that they don't affect the | |
659 | * choice of the low-power state to put the device into. | |
660 | */ | |
661 | dev_pm_qos_hide_latency_limit(dev); | |
662 | dev_pm_qos_hide_flags(dev); | |
663 | __acpi_device_run_wake(adev, false); | |
664 | acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); | |
665 | } | |
e5cc8ef3 RW |
666 | } |
667 | } | |
668 | EXPORT_SYMBOL_GPL(acpi_dev_pm_detach); |