Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
aa57aca8 | 3 | * drivers/acpi/power.c - ACPI Power Resources management. |
1da177e4 | 4 | * |
aa57aca8 RW |
5 | * Copyright (C) 2001 - 2015 Intel Corp. |
6 | * Author: Andy Grover <andrew.grover@intel.com> | |
7 | * Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
8 | * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
1da177e4 LT |
9 | */ |
10 | ||
11 | /* | |
12 | * ACPI power-managed devices may be controlled in two ways: | |
13 | * 1. via "Device Specific (D-State) Control" | |
14 | * 2. via "Power Resource Control". | |
aa57aca8 | 15 | * The code below deals with ACPI Power Resources control. |
c6237b21 | 16 | * |
aa57aca8 RW |
17 | * An ACPI "power resource object" represents a software controllable power |
18 | * plane, clock plane, or other resource depended on by a device. | |
19 | * | |
1da177e4 LT |
20 | * A device may rely on multiple power resources, and a power resource |
21 | * may be shared by multiple devices. | |
22 | */ | |
23 | ||
56ce8339 RW |
24 | #define pr_fmt(fmt) "ACPI: PM: " fmt |
25 | ||
1da177e4 LT |
26 | #include <linux/kernel.h> |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
0090def6 | 31 | #include <linux/pm_runtime.h> |
18a38709 | 32 | #include <linux/sysfs.h> |
8b48463f | 33 | #include <linux/acpi.h> |
9b83ccd2 | 34 | #include "sleep.h" |
0090def6 | 35 | #include "internal.h" |
9b83ccd2 | 36 | |
1da177e4 | 37 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 | 38 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
1da177e4 LT |
39 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 |
40 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
41 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 42 | |
4533771c MW |
43 | struct acpi_power_dependent_device { |
44 | struct device *dev; | |
45 | struct list_head node; | |
46 | }; | |
47 | ||
4be44fcd | 48 | struct acpi_power_resource { |
82c7d5ef | 49 | struct acpi_device device; |
781d737c | 50 | struct list_head list_node; |
4be44fcd LB |
51 | u32 system_level; |
52 | u32 order; | |
3e384ee6 | 53 | unsigned int ref_count; |
ca84f187 | 54 | u8 state; |
0a613902 | 55 | struct mutex resource_lock; |
4533771c | 56 | struct list_head dependents; |
1da177e4 LT |
57 | }; |
58 | ||
0b224527 RW |
59 | struct acpi_power_resource_entry { |
60 | struct list_head node; | |
61 | struct acpi_power_resource *resource; | |
62 | }; | |
63 | ||
781d737c RW |
64 | static LIST_HEAD(acpi_power_resource_list); |
65 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 66 | |
1da177e4 LT |
67 | /* -------------------------------------------------------------------------- |
68 | Power Resource Management | |
69 | -------------------------------------------------------------------------- */ | |
70 | ||
2bc4eb94 RW |
71 | static inline const char *resource_dev_name(struct acpi_power_resource *pr) |
72 | { | |
73 | return dev_name(&pr->device.dev); | |
74 | } | |
75 | ||
b1c0f99b RW |
76 | static inline |
77 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
78 | { | |
79 | return container_of(device, struct acpi_power_resource, device); | |
80 | } | |
81 | ||
82c7d5ef | 82 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 83 | { |
99ece713 | 84 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
1da177e4 | 85 | |
99ece713 | 86 | if (!device) |
82c7d5ef | 87 | return NULL; |
1da177e4 | 88 | |
b1c0f99b | 89 | return to_power_resource(device); |
1da177e4 LT |
90 | } |
91 | ||
e88c9c60 RW |
92 | static int acpi_power_resources_list_add(acpi_handle handle, |
93 | struct list_head *list) | |
0b224527 RW |
94 | { |
95 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
96 | struct acpi_power_resource_entry *entry; | |
97 | ||
98 | if (!resource || !list) | |
e88c9c60 | 99 | return -EINVAL; |
0b224527 RW |
100 | |
101 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
102 | if (!entry) | |
e88c9c60 | 103 | return -ENOMEM; |
0b224527 RW |
104 | |
105 | entry->resource = resource; | |
106 | if (!list_empty(list)) { | |
107 | struct acpi_power_resource_entry *e; | |
108 | ||
109 | list_for_each_entry(e, list, node) | |
110 | if (e->resource->order > resource->order) { | |
111 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 112 | return 0; |
0b224527 RW |
113 | } |
114 | } | |
115 | list_add_tail(&entry->node, list); | |
e88c9c60 | 116 | return 0; |
0b224527 RW |
117 | } |
118 | ||
119 | void acpi_power_resources_list_free(struct list_head *list) | |
120 | { | |
121 | struct acpi_power_resource_entry *entry, *e; | |
122 | ||
123 | list_for_each_entry_safe(entry, e, list, node) { | |
124 | list_del(&entry->node); | |
125 | kfree(entry); | |
126 | } | |
127 | } | |
128 | ||
7d7b467c HG |
129 | static bool acpi_power_resource_is_dup(union acpi_object *package, |
130 | unsigned int start, unsigned int i) | |
131 | { | |
132 | acpi_handle rhandle, dup; | |
133 | unsigned int j; | |
134 | ||
135 | /* The caller is expected to check the package element types */ | |
136 | rhandle = package->package.elements[i].reference.handle; | |
137 | for (j = start; j < i; j++) { | |
138 | dup = package->package.elements[j].reference.handle; | |
139 | if (dup == rhandle) | |
140 | return true; | |
141 | } | |
142 | ||
143 | return false; | |
144 | } | |
145 | ||
e88c9c60 RW |
146 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
147 | struct list_head *list) | |
ef85bdbe | 148 | { |
ef85bdbe | 149 | unsigned int i; |
e88c9c60 | 150 | int err = 0; |
ef85bdbe RW |
151 | |
152 | for (i = start; i < package->package.count; i++) { | |
153 | union acpi_object *element = &package->package.elements[i]; | |
9b7ff25d | 154 | struct acpi_device *rdev; |
ef85bdbe RW |
155 | acpi_handle rhandle; |
156 | ||
157 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 158 | err = -ENODATA; |
ef85bdbe RW |
159 | break; |
160 | } | |
161 | rhandle = element->reference.handle; | |
162 | if (!rhandle) { | |
e88c9c60 | 163 | err = -ENODEV; |
ef85bdbe RW |
164 | break; |
165 | } | |
7d7b467c HG |
166 | |
167 | /* Some ACPI tables contain duplicate power resource references */ | |
168 | if (acpi_power_resource_is_dup(package, start, i)) | |
169 | continue; | |
170 | ||
9b7ff25d RW |
171 | rdev = acpi_add_power_resource(rhandle); |
172 | if (!rdev) { | |
173 | err = -ENODEV; | |
e88c9c60 | 174 | break; |
9b7ff25d | 175 | } |
e88c9c60 RW |
176 | err = acpi_power_resources_list_add(rhandle, list); |
177 | if (err) | |
178 | break; | |
ef85bdbe | 179 | } |
e88c9c60 | 180 | if (err) |
ef85bdbe RW |
181 | acpi_power_resources_list_free(list); |
182 | ||
e88c9c60 | 183 | return err; |
ef85bdbe RW |
184 | } |
185 | ||
ca84f187 | 186 | static int __get_state(acpi_handle handle, u8 *state) |
1da177e4 | 187 | { |
4be44fcd | 188 | acpi_status status = AE_OK; |
27663c58 | 189 | unsigned long long sta = 0; |
587024b8 | 190 | u8 cur_state; |
1da177e4 | 191 | |
a51e145f | 192 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 193 | if (ACPI_FAILURE(status)) |
d550d98d | 194 | return -ENODEV; |
1da177e4 | 195 | |
587024b8 | 196 | cur_state = sta & ACPI_POWER_RESOURCE_STATE_ON; |
1da177e4 | 197 | |
56ce8339 | 198 | acpi_handle_debug(handle, "Power resource is %s\n", |
587024b8 | 199 | cur_state ? "on" : "off"); |
1da177e4 | 200 | |
587024b8 | 201 | *state = cur_state; |
d550d98d | 202 | return 0; |
1da177e4 LT |
203 | } |
204 | ||
ca84f187 RW |
205 | static int acpi_power_get_state(struct acpi_power_resource *resource, u8 *state) |
206 | { | |
207 | if (resource->state == ACPI_POWER_RESOURCE_STATE_UNKNOWN) { | |
208 | int ret; | |
209 | ||
210 | ret = __get_state(resource->device.handle, &resource->state); | |
211 | if (ret) | |
212 | return ret; | |
213 | } | |
214 | ||
215 | *state = resource->state; | |
216 | return 0; | |
217 | } | |
218 | ||
587024b8 | 219 | static int acpi_power_get_list_state(struct list_head *list, u8 *state) |
1da177e4 | 220 | { |
0b224527 | 221 | struct acpi_power_resource_entry *entry; |
587024b8 | 222 | u8 cur_state = ACPI_POWER_RESOURCE_STATE_OFF; |
1da177e4 LT |
223 | |
224 | if (!list || !state) | |
d550d98d | 225 | return -EINVAL; |
1da177e4 LT |
226 | |
227 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
0b224527 RW |
228 | list_for_each_entry(entry, list, node) { |
229 | struct acpi_power_resource *resource = entry->resource; | |
d0515d9f RW |
230 | int result; |
231 | ||
d0515d9f | 232 | mutex_lock(&resource->resource_lock); |
ca84f187 | 233 | result = acpi_power_get_state(resource, &cur_state); |
d0515d9f | 234 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
235 | if (result) |
236 | return result; | |
237 | ||
238 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
239 | break; |
240 | } | |
241 | ||
56ce8339 | 242 | pr_debug("Power resource list is %s\n", cur_state ? "on" : "off"); |
1da177e4 | 243 | |
d0515d9f | 244 | *state = cur_state; |
d0515d9f | 245 | return 0; |
1da177e4 LT |
246 | } |
247 | ||
4533771c MW |
248 | static int |
249 | acpi_power_resource_add_dependent(struct acpi_power_resource *resource, | |
250 | struct device *dev) | |
251 | { | |
252 | struct acpi_power_dependent_device *dep; | |
253 | int ret = 0; | |
254 | ||
255 | mutex_lock(&resource->resource_lock); | |
256 | list_for_each_entry(dep, &resource->dependents, node) { | |
257 | /* Only add it once */ | |
258 | if (dep->dev == dev) | |
259 | goto unlock; | |
260 | } | |
261 | ||
262 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); | |
263 | if (!dep) { | |
264 | ret = -ENOMEM; | |
265 | goto unlock; | |
266 | } | |
267 | ||
268 | dep->dev = dev; | |
269 | list_add_tail(&dep->node, &resource->dependents); | |
2bc4eb94 RW |
270 | dev_dbg(dev, "added power dependency to [%s]\n", |
271 | resource_dev_name(resource)); | |
4533771c MW |
272 | |
273 | unlock: | |
274 | mutex_unlock(&resource->resource_lock); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | static void | |
279 | acpi_power_resource_remove_dependent(struct acpi_power_resource *resource, | |
280 | struct device *dev) | |
281 | { | |
282 | struct acpi_power_dependent_device *dep; | |
283 | ||
284 | mutex_lock(&resource->resource_lock); | |
285 | list_for_each_entry(dep, &resource->dependents, node) { | |
286 | if (dep->dev == dev) { | |
287 | list_del(&dep->node); | |
288 | kfree(dep); | |
289 | dev_dbg(dev, "removed power dependency to [%s]\n", | |
2bc4eb94 | 290 | resource_dev_name(resource)); |
4533771c MW |
291 | break; |
292 | } | |
293 | } | |
294 | mutex_unlock(&resource->resource_lock); | |
295 | } | |
296 | ||
297 | /** | |
298 | * acpi_device_power_add_dependent - Add dependent device of this ACPI device | |
299 | * @adev: ACPI device pointer | |
300 | * @dev: Dependent device | |
301 | * | |
302 | * If @adev has non-empty _PR0 the @dev is added as dependent device to all | |
303 | * power resources returned by it. This means that whenever these power | |
304 | * resources are turned _ON the dependent devices get runtime resumed. This | |
305 | * is needed for devices such as PCI to allow its driver to re-initialize | |
306 | * it after it went to D0uninitialized. | |
307 | * | |
308 | * If @adev does not have _PR0 this does nothing. | |
309 | * | |
310 | * Returns %0 in case of success and negative errno otherwise. | |
311 | */ | |
312 | int acpi_device_power_add_dependent(struct acpi_device *adev, | |
313 | struct device *dev) | |
314 | { | |
315 | struct acpi_power_resource_entry *entry; | |
316 | struct list_head *resources; | |
317 | int ret; | |
318 | ||
319 | if (!adev->flags.power_manageable) | |
320 | return 0; | |
321 | ||
322 | resources = &adev->power.states[ACPI_STATE_D0].resources; | |
323 | list_for_each_entry(entry, resources, node) { | |
324 | ret = acpi_power_resource_add_dependent(entry->resource, dev); | |
325 | if (ret) | |
326 | goto err; | |
327 | } | |
328 | ||
329 | return 0; | |
330 | ||
331 | err: | |
332 | list_for_each_entry(entry, resources, node) | |
333 | acpi_power_resource_remove_dependent(entry->resource, dev); | |
334 | ||
335 | return ret; | |
336 | } | |
337 | ||
338 | /** | |
339 | * acpi_device_power_remove_dependent - Remove dependent device | |
340 | * @adev: ACPI device pointer | |
341 | * @dev: Dependent device | |
342 | * | |
343 | * Does the opposite of acpi_device_power_add_dependent() and removes the | |
344 | * dependent device if it is found. Can be called to @adev that does not | |
345 | * have _PR0 as well. | |
346 | */ | |
347 | void acpi_device_power_remove_dependent(struct acpi_device *adev, | |
348 | struct device *dev) | |
349 | { | |
350 | struct acpi_power_resource_entry *entry; | |
351 | struct list_head *resources; | |
352 | ||
353 | if (!adev->flags.power_manageable) | |
354 | return; | |
355 | ||
356 | resources = &adev->power.states[ACPI_STATE_D0].resources; | |
357 | list_for_each_entry_reverse(entry, resources, node) | |
358 | acpi_power_resource_remove_dependent(entry->resource, dev); | |
359 | } | |
360 | ||
3e384ee6 | 361 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 362 | { |
fad40a62 | 363 | acpi_handle handle = resource->device.handle; |
4533771c | 364 | struct acpi_power_dependent_device *dep; |
4be44fcd | 365 | acpi_status status = AE_OK; |
1da177e4 | 366 | |
fad40a62 | 367 | status = acpi_evaluate_object(handle, "_ON", NULL, NULL); |
ca84f187 RW |
368 | if (ACPI_FAILURE(status)) { |
369 | resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; | |
3e384ee6 | 370 | return -ENODEV; |
ca84f187 RW |
371 | } |
372 | ||
373 | resource->state = ACPI_POWER_RESOURCE_STATE_ON; | |
3e384ee6 | 374 | |
fad40a62 | 375 | acpi_handle_debug(handle, "Power resource turned on\n"); |
3e384ee6 | 376 | |
4533771c MW |
377 | /* |
378 | * If there are other dependents on this power resource we need to | |
379 | * resume them now so that their drivers can re-initialize the | |
380 | * hardware properly after it went back to D0. | |
381 | */ | |
382 | if (list_empty(&resource->dependents) || | |
383 | list_is_singular(&resource->dependents)) | |
384 | return 0; | |
385 | ||
386 | list_for_each_entry(dep, &resource->dependents, node) { | |
387 | dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n", | |
2bc4eb94 | 388 | resource_dev_name(resource)); |
4533771c MW |
389 | pm_request_resume(dep->dev); |
390 | } | |
391 | ||
3e384ee6 RW |
392 | return 0; |
393 | } | |
394 | ||
b5d667eb | 395 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 396 | { |
b5d667eb | 397 | int result = 0; |
0a613902 | 398 | |
3e384ee6 | 399 | if (resource->ref_count++) { |
fad40a62 RW |
400 | acpi_handle_debug(resource->device.handle, |
401 | "Power resource already on\n"); | |
3e384ee6 RW |
402 | } else { |
403 | result = __acpi_power_on(resource); | |
41863fce | 404 | if (result) |
12b3b5af | 405 | resource->ref_count--; |
40bf66ec | 406 | } |
b5d667eb RW |
407 | return result; |
408 | } | |
40bf66ec | 409 | |
b5d667eb RW |
410 | static int acpi_power_on(struct acpi_power_resource *resource) |
411 | { | |
412 | int result; | |
40bf66ec | 413 | |
b5d667eb RW |
414 | mutex_lock(&resource->resource_lock); |
415 | result = acpi_power_on_unlocked(resource); | |
416 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 417 | return result; |
1da177e4 LT |
418 | } |
419 | ||
660b1113 RW |
420 | static int __acpi_power_off(struct acpi_power_resource *resource) |
421 | { | |
fad40a62 | 422 | acpi_handle handle = resource->device.handle; |
660b1113 RW |
423 | acpi_status status; |
424 | ||
fad40a62 | 425 | status = acpi_evaluate_object(handle, "_OFF", NULL, NULL); |
ca84f187 RW |
426 | if (ACPI_FAILURE(status)) { |
427 | resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; | |
660b1113 | 428 | return -ENODEV; |
ca84f187 RW |
429 | } |
430 | ||
431 | resource->state = ACPI_POWER_RESOURCE_STATE_OFF; | |
660b1113 | 432 | |
fad40a62 | 433 | acpi_handle_debug(handle, "Power resource turned off\n"); |
56ce8339 | 434 | |
660b1113 RW |
435 | return 0; |
436 | } | |
437 | ||
b5d667eb | 438 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 439 | { |
0b224527 | 440 | int result = 0; |
1da177e4 | 441 | |
3e384ee6 | 442 | if (!resource->ref_count) { |
fad40a62 RW |
443 | acpi_handle_debug(resource->device.handle, |
444 | "Power resource already off\n"); | |
b5d667eb | 445 | return 0; |
0a613902 | 446 | } |
1da177e4 | 447 | |
3e384ee6 | 448 | if (--resource->ref_count) { |
fad40a62 RW |
449 | acpi_handle_debug(resource->device.handle, |
450 | "Power resource still in use\n"); | |
660b1113 RW |
451 | } else { |
452 | result = __acpi_power_off(resource); | |
453 | if (result) | |
454 | resource->ref_count++; | |
1da177e4 | 455 | } |
b5d667eb RW |
456 | return result; |
457 | } | |
1da177e4 | 458 | |
b5d667eb RW |
459 | static int acpi_power_off(struct acpi_power_resource *resource) |
460 | { | |
461 | int result; | |
1da177e4 | 462 | |
b5d667eb RW |
463 | mutex_lock(&resource->resource_lock); |
464 | result = acpi_power_off_unlocked(resource); | |
465 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 466 | return result; |
1da177e4 LT |
467 | } |
468 | ||
0b224527 | 469 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 470 | { |
0b224527 RW |
471 | struct acpi_power_resource_entry *entry; |
472 | int result = 0; | |
d2ef555b | 473 | |
0b224527 RW |
474 | list_for_each_entry_reverse(entry, list, node) { |
475 | result = acpi_power_off(entry->resource); | |
476 | if (result) | |
477 | goto err; | |
478 | } | |
479 | return 0; | |
d2ef555b | 480 | |
0b224527 RW |
481 | err: |
482 | list_for_each_entry_continue(entry, list, node) | |
483 | acpi_power_on(entry->resource); | |
484 | ||
485 | return result; | |
d2ef555b RW |
486 | } |
487 | ||
0b224527 | 488 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 489 | { |
0b224527 | 490 | struct acpi_power_resource_entry *entry; |
d2ef555b | 491 | int result = 0; |
d2ef555b | 492 | |
0b224527 RW |
493 | list_for_each_entry(entry, list, node) { |
494 | result = acpi_power_on(entry->resource); | |
495 | if (result) | |
496 | goto err; | |
d2ef555b | 497 | } |
0b224527 RW |
498 | return 0; |
499 | ||
500 | err: | |
501 | list_for_each_entry_continue_reverse(entry, list, node) | |
502 | acpi_power_off(entry->resource); | |
d2ef555b RW |
503 | |
504 | return result; | |
505 | } | |
506 | ||
18a38709 RW |
507 | static struct attribute *attrs[] = { |
508 | NULL, | |
509 | }; | |
510 | ||
26408b24 | 511 | static const struct attribute_group attr_groups[] = { |
18a38709 RW |
512 | [ACPI_STATE_D0] = { |
513 | .name = "power_resources_D0", | |
514 | .attrs = attrs, | |
515 | }, | |
516 | [ACPI_STATE_D1] = { | |
517 | .name = "power_resources_D1", | |
518 | .attrs = attrs, | |
519 | }, | |
520 | [ACPI_STATE_D2] = { | |
521 | .name = "power_resources_D2", | |
522 | .attrs = attrs, | |
523 | }, | |
524 | [ACPI_STATE_D3_HOT] = { | |
525 | .name = "power_resources_D3hot", | |
526 | .attrs = attrs, | |
527 | }, | |
528 | }; | |
529 | ||
26408b24 | 530 | static const struct attribute_group wakeup_attr_group = { |
41a2a466 RW |
531 | .name = "power_resources_wakeup", |
532 | .attrs = attrs, | |
533 | }; | |
534 | ||
535 | static void acpi_power_hide_list(struct acpi_device *adev, | |
536 | struct list_head *resources, | |
26408b24 | 537 | const struct attribute_group *attr_group) |
18a38709 | 538 | { |
18a38709 RW |
539 | struct acpi_power_resource_entry *entry; |
540 | ||
41a2a466 | 541 | if (list_empty(resources)) |
18a38709 RW |
542 | return; |
543 | ||
41a2a466 | 544 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
545 | struct acpi_device *res_dev = &entry->resource->device; |
546 | ||
547 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 548 | attr_group->name, |
18a38709 RW |
549 | dev_name(&res_dev->dev)); |
550 | } | |
41a2a466 | 551 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
552 | } |
553 | ||
41a2a466 RW |
554 | static void acpi_power_expose_list(struct acpi_device *adev, |
555 | struct list_head *resources, | |
26408b24 | 556 | const struct attribute_group *attr_group) |
0090def6 | 557 | { |
18a38709 RW |
558 | struct acpi_power_resource_entry *entry; |
559 | int ret; | |
560 | ||
41a2a466 | 561 | if (list_empty(resources)) |
18a38709 RW |
562 | return; |
563 | ||
41a2a466 | 564 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
565 | if (ret) |
566 | return; | |
567 | ||
41a2a466 | 568 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
569 | struct acpi_device *res_dev = &entry->resource->device; |
570 | ||
571 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 572 | attr_group->name, |
18a38709 RW |
573 | &res_dev->dev.kobj, |
574 | dev_name(&res_dev->dev)); | |
575 | if (ret) { | |
41a2a466 | 576 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 577 | break; |
0090def6 LM |
578 | } |
579 | } | |
0090def6 | 580 | } |
bc9b6407 | 581 | |
41a2a466 RW |
582 | static void acpi_power_expose_hide(struct acpi_device *adev, |
583 | struct list_head *resources, | |
26408b24 | 584 | const struct attribute_group *attr_group, |
41a2a466 RW |
585 | bool expose) |
586 | { | |
587 | if (expose) | |
588 | acpi_power_expose_list(adev, resources, attr_group); | |
589 | else | |
590 | acpi_power_hide_list(adev, resources, attr_group); | |
591 | } | |
592 | ||
18a38709 RW |
593 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
594 | { | |
18a38709 RW |
595 | int state; |
596 | ||
41a2a466 RW |
597 | if (adev->wakeup.flags.valid) |
598 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
599 | &wakeup_attr_group, add); | |
600 | ||
18a38709 RW |
601 | if (!adev->power.flags.power_resources) |
602 | return; | |
603 | ||
41a2a466 RW |
604 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
605 | acpi_power_expose_hide(adev, | |
606 | &adev->power.states[state].resources, | |
607 | &attr_groups[state], add); | |
18a38709 RW |
608 | } |
609 | ||
b5d667eb | 610 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
611 | { |
612 | struct acpi_power_resource_entry *entry; | |
613 | int system_level = 5; | |
614 | ||
615 | list_for_each_entry(entry, list, node) { | |
616 | struct acpi_power_resource *resource = entry->resource; | |
587024b8 | 617 | u8 state; |
0596a52b | 618 | |
b5d667eb RW |
619 | mutex_lock(&resource->resource_lock); |
620 | ||
7a63296d RW |
621 | /* |
622 | * Make sure that the power resource state and its reference | |
623 | * counter value are consistent with each other. | |
624 | */ | |
625 | if (!resource->ref_count && | |
626 | !acpi_power_get_state(resource, &state) && | |
627 | state == ACPI_POWER_RESOURCE_STATE_ON) | |
628 | __acpi_power_off(resource); | |
629 | ||
0596a52b RW |
630 | if (system_level > resource->system_level) |
631 | system_level = resource->system_level; | |
b5d667eb RW |
632 | |
633 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 634 | } |
b5d667eb RW |
635 | *system_level_p = system_level; |
636 | return 0; | |
0596a52b RW |
637 | } |
638 | ||
bc9b6407 RW |
639 | /* -------------------------------------------------------------------------- |
640 | Device Power Management | |
641 | -------------------------------------------------------------------------- */ | |
0090def6 | 642 | |
77e76609 RW |
643 | /** |
644 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
645 | * ACPI 3.0) _PSW (Power State Wake) | |
646 | * @dev: Device to handle. | |
647 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
648 | * @sleep_state: Target sleep state of the system. | |
649 | * @dev_state: Target power state of the device. | |
650 | * | |
651 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
652 | * State Wake) for the device, if present. On failure reset the device's | |
653 | * wakeup.flags.valid flag. | |
654 | * | |
655 | * RETURN VALUE: | |
656 | * 0 if either _DSW or _PSW has been successfully executed | |
657 | * 0 if neither _DSW nor _PSW has been found | |
658 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
659 | */ | |
660 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
c6237b21 | 661 | int enable, int sleep_state, int dev_state) |
77e76609 RW |
662 | { |
663 | union acpi_object in_arg[3]; | |
664 | struct acpi_object_list arg_list = { 3, in_arg }; | |
665 | acpi_status status = AE_OK; | |
666 | ||
667 | /* | |
668 | * Try to execute _DSW first. | |
669 | * | |
603fadf3 | 670 | * Three arguments are needed for the _DSW object: |
77e76609 RW |
671 | * Argument 0: enable/disable the wake capabilities |
672 | * Argument 1: target system state | |
673 | * Argument 2: target device state | |
674 | * When _DSW object is called to disable the wake capabilities, maybe | |
603fadf3 | 675 | * the first argument is filled. The values of the other two arguments |
77e76609 RW |
676 | * are meaningless. |
677 | */ | |
678 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
679 | in_arg[0].integer.value = enable; | |
680 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
681 | in_arg[1].integer.value = sleep_state; | |
682 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
683 | in_arg[2].integer.value = dev_state; | |
684 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
685 | if (ACPI_SUCCESS(status)) { | |
686 | return 0; | |
687 | } else if (status != AE_NOT_FOUND) { | |
56ce8339 | 688 | acpi_handle_info(dev->handle, "_DSW execution failed\n"); |
77e76609 RW |
689 | dev->wakeup.flags.valid = 0; |
690 | return -ENODEV; | |
691 | } | |
692 | ||
693 | /* Execute _PSW */ | |
0db98202 | 694 | status = acpi_execute_simple_method(dev->handle, "_PSW", enable); |
77e76609 | 695 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
56ce8339 | 696 | acpi_handle_info(dev->handle, "_PSW execution failed\n"); |
77e76609 RW |
697 | dev->wakeup.flags.valid = 0; |
698 | return -ENODEV; | |
699 | } | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
1da177e4 LT |
704 | /* |
705 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
c6237b21 | 706 | * 1. Power on the power resources required for the wakeup device |
77e76609 RW |
707 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
708 | * State Wake) for the device, if present | |
1da177e4 | 709 | */ |
77e76609 | 710 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 711 | { |
993cbe59 | 712 | int err = 0; |
1da177e4 | 713 | |
1da177e4 | 714 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 715 | return -EINVAL; |
1da177e4 | 716 | |
9b83ccd2 RW |
717 | mutex_lock(&acpi_device_lock); |
718 | ||
5b6a8f14 RW |
719 | dev_dbg(&dev->dev, "Enabling wakeup power (count %d)\n", |
720 | dev->wakeup.prepare_count); | |
721 | ||
9b83ccd2 RW |
722 | if (dev->wakeup.prepare_count++) |
723 | goto out; | |
0af4b8c4 | 724 | |
a2d7b2e0 RW |
725 | err = acpi_power_on_list(&dev->wakeup.resources); |
726 | if (err) { | |
727 | dev_err(&dev->dev, "Cannot turn on wakeup power resources\n"); | |
728 | dev->wakeup.flags.valid = 0; | |
729 | goto out; | |
1da177e4 | 730 | } |
a2d7b2e0 | 731 | |
b5d667eb RW |
732 | /* |
733 | * Passing 3 as the third argument below means the device may be | |
734 | * put into arbitrary power state afterward. | |
735 | */ | |
736 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
a9a8f827 RW |
737 | if (err) { |
738 | acpi_power_off_list(&dev->wakeup.resources); | |
9b83ccd2 | 739 | dev->wakeup.prepare_count = 0; |
5b6a8f14 | 740 | goto out; |
a9a8f827 | 741 | } |
9b83ccd2 | 742 | |
5b6a8f14 RW |
743 | dev_dbg(&dev->dev, "Wakeup power enabled\n"); |
744 | ||
9b83ccd2 RW |
745 | out: |
746 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 747 | return err; |
1da177e4 LT |
748 | } |
749 | ||
750 | /* | |
751 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
752 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
753 | * State Wake) for the device, if present | |
1da177e4 LT |
754 | * 2. Shutdown down the power resources |
755 | */ | |
4be44fcd | 756 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 757 | { |
b5d667eb | 758 | struct acpi_power_resource_entry *entry; |
993cbe59 | 759 | int err = 0; |
1da177e4 LT |
760 | |
761 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 762 | return -EINVAL; |
1da177e4 | 763 | |
9b83ccd2 RW |
764 | mutex_lock(&acpi_device_lock); |
765 | ||
5b6a8f14 RW |
766 | dev_dbg(&dev->dev, "Disabling wakeup power (count %d)\n", |
767 | dev->wakeup.prepare_count); | |
768 | ||
452a3e72 RW |
769 | /* Do nothing if wakeup power has not been enabled for this device. */ |
770 | if (dev->wakeup.prepare_count <= 0) | |
9b83ccd2 RW |
771 | goto out; |
772 | ||
452a3e72 | 773 | if (--dev->wakeup.prepare_count > 0) |
a2d7b2e0 | 774 | goto out; |
0af4b8c4 | 775 | |
9b83ccd2 RW |
776 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
777 | if (err) | |
778 | goto out; | |
1da177e4 | 779 | |
a2d7b2e0 RW |
780 | /* |
781 | * All of the power resources in the list need to be turned off even if | |
782 | * there are errors. | |
783 | */ | |
b5d667eb | 784 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
a2d7b2e0 | 785 | int ret; |
b5d667eb | 786 | |
a2d7b2e0 RW |
787 | ret = acpi_power_off(entry->resource); |
788 | if (ret && !err) | |
789 | err = ret; | |
790 | } | |
791 | if (err) { | |
792 | dev_err(&dev->dev, "Cannot turn off wakeup power resources\n"); | |
793 | dev->wakeup.flags.valid = 0; | |
5b6a8f14 | 794 | goto out; |
1da177e4 LT |
795 | } |
796 | ||
5b6a8f14 RW |
797 | dev_dbg(&dev->dev, "Wakeup power disabled\n"); |
798 | ||
9b83ccd2 RW |
799 | out: |
800 | mutex_unlock(&acpi_device_lock); | |
801 | return err; | |
1da177e4 LT |
802 | } |
803 | ||
32a00d27 | 804 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 805 | { |
587024b8 | 806 | u8 list_state = ACPI_POWER_RESOURCE_STATE_OFF; |
4be44fcd | 807 | int result = 0; |
4be44fcd | 808 | int i = 0; |
1da177e4 | 809 | |
32a00d27 | 810 | if (!device || !state) |
d550d98d | 811 | return -EINVAL; |
1da177e4 | 812 | |
1da177e4 LT |
813 | /* |
814 | * We know a device's inferred power state when all the resources | |
815 | * required for a given D-state are 'on'. | |
816 | */ | |
38c92fff | 817 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
818 | struct list_head *list = &device->power.states[i].resources; |
819 | ||
820 | if (list_empty(list)) | |
1da177e4 LT |
821 | continue; |
822 | ||
823 | result = acpi_power_get_list_state(list, &list_state); | |
824 | if (result) | |
d550d98d | 825 | return result; |
1da177e4 LT |
826 | |
827 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 828 | *state = i; |
d550d98d | 829 | return 0; |
1da177e4 LT |
830 | } |
831 | } | |
832 | ||
20dacb71 RW |
833 | *state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ? |
834 | ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT; | |
d550d98d | 835 | return 0; |
1da177e4 LT |
836 | } |
837 | ||
30d3df41 RW |
838 | int acpi_power_on_resources(struct acpi_device *device, int state) |
839 | { | |
87e753b0 | 840 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
841 | return -EINVAL; |
842 | ||
843 | return acpi_power_on_list(&device->power.states[state].resources); | |
844 | } | |
845 | ||
4be44fcd | 846 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 847 | { |
5c7dd710 | 848 | int result = 0; |
1da177e4 | 849 | |
3ebc81b8 | 850 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 851 | return -EINVAL; |
1da177e4 | 852 | |
0b224527 | 853 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
854 | return 0; |
855 | ||
4be44fcd | 856 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 857 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 858 | return -ENODEV; |
1da177e4 | 859 | |
1da177e4 LT |
860 | /* |
861 | * First we reference all power resources required in the target list | |
d2ef555b RW |
862 | * (e.g. so the device doesn't lose power while transitioning). Then, |
863 | * we dereference all power resources used in the current list. | |
1da177e4 | 864 | */ |
5c7dd710 RW |
865 | if (state < ACPI_STATE_D3_COLD) |
866 | result = acpi_power_on_list( | |
867 | &device->power.states[state].resources); | |
868 | ||
869 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
870 | acpi_power_off_list( |
871 | &device->power.states[device->power.state].resources); | |
1da177e4 | 872 | |
d2ef555b RW |
873 | /* We shouldn't change the state unless the above operations succeed. */ |
874 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 875 | |
d550d98d | 876 | return result; |
1da177e4 LT |
877 | } |
878 | ||
82c7d5ef RW |
879 | static void acpi_release_power_resource(struct device *dev) |
880 | { | |
881 | struct acpi_device *device = to_acpi_device(dev); | |
882 | struct acpi_power_resource *resource; | |
883 | ||
82c7d5ef | 884 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
885 | |
886 | mutex_lock(&power_resource_list_lock); | |
887 | list_del(&resource->list_node); | |
888 | mutex_unlock(&power_resource_list_lock); | |
889 | ||
c0af4175 | 890 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
891 | kfree(resource); |
892 | } | |
1da177e4 | 893 | |
0f39ee83 DR |
894 | static ssize_t resource_in_use_show(struct device *dev, |
895 | struct device_attribute *attr, | |
896 | char *buf) | |
897 | { | |
b1c0f99b RW |
898 | struct acpi_power_resource *resource; |
899 | ||
900 | resource = to_power_resource(to_acpi_device(dev)); | |
901 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
902 | } | |
0f39ee83 | 903 | static DEVICE_ATTR_RO(resource_in_use); |
b1c0f99b RW |
904 | |
905 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
906 | { | |
907 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
908 | } | |
909 | ||
d5eefa82 RW |
910 | static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource) |
911 | { | |
912 | mutex_lock(&power_resource_list_lock); | |
913 | ||
914 | if (!list_empty(&acpi_power_resource_list)) { | |
915 | struct acpi_power_resource *r; | |
916 | ||
917 | list_for_each_entry(r, &acpi_power_resource_list, list_node) | |
918 | if (r->order > resource->order) { | |
919 | list_add_tail(&resource->list_node, &r->list_node); | |
920 | goto out; | |
921 | } | |
922 | } | |
923 | list_add_tail(&resource->list_node, &acpi_power_resource_list); | |
924 | ||
925 | out: | |
926 | mutex_unlock(&power_resource_list_lock); | |
927 | } | |
928 | ||
9b7ff25d | 929 | struct acpi_device *acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 930 | { |
99ece713 | 931 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
82c7d5ef | 932 | struct acpi_power_resource *resource; |
4be44fcd LB |
933 | union acpi_object acpi_object; |
934 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef | 935 | acpi_status status; |
a1224f34 | 936 | u8 state_dummy; |
587024b8 | 937 | int result; |
1da177e4 | 938 | |
82c7d5ef | 939 | if (device) |
9b7ff25d | 940 | return device; |
1da177e4 | 941 | |
82c7d5ef | 942 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 943 | if (!resource) |
9b7ff25d | 944 | return NULL; |
1da177e4 | 945 | |
82c7d5ef | 946 | device = &resource->device; |
c830dbcf | 947 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER); |
0a613902 | 948 | mutex_init(&resource->resource_lock); |
6ee22e9d | 949 | INIT_LIST_HEAD(&resource->list_node); |
4533771c | 950 | INIT_LIST_HEAD(&resource->dependents); |
1da177e4 LT |
951 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
952 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 953 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 | 954 | |
935ab850 | 955 | /* Evaluate the object to get the system level and resource order. */ |
82c7d5ef RW |
956 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
957 | if (ACPI_FAILURE(status)) | |
781d737c | 958 | goto err; |
82c7d5ef | 959 | |
1da177e4 LT |
960 | resource->system_level = acpi_object.power_resource.system_level; |
961 | resource->order = acpi_object.power_resource.resource_order; | |
ca84f187 | 962 | resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; |
1da177e4 | 963 | |
a1224f34 RW |
964 | /* Get the initial state or just flip it on if that fails. */ |
965 | if (acpi_power_get_state(resource, &state_dummy)) | |
966 | __acpi_power_on(resource); | |
967 | ||
ca84f187 | 968 | pr_info("%s [%s]\n", acpi_device_name(device), acpi_device_bid(device)); |
1da177e4 | 969 | |
82c7d5ef | 970 | device->flags.match_driver = true; |
cf860be6 | 971 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 972 | if (result) |
781d737c | 973 | goto err; |
4be44fcd | 974 | |
b1c0f99b RW |
975 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
976 | device->remove = acpi_power_sysfs_remove; | |
977 | ||
d5eefa82 | 978 | acpi_power_add_resource_to_list(resource); |
cf860be6 | 979 | acpi_device_add_finalize(device); |
9b7ff25d | 980 | return device; |
1da177e4 | 981 | |
781d737c RW |
982 | err: |
983 | acpi_release_power_resource(&device->dev); | |
9b7ff25d | 984 | return NULL; |
781d737c | 985 | } |
1da177e4 | 986 | |
781d737c RW |
987 | #ifdef CONFIG_ACPI_SLEEP |
988 | void acpi_resume_power_resources(void) | |
0a613902 | 989 | { |
3e384ee6 | 990 | struct acpi_power_resource *resource; |
0a613902 | 991 | |
781d737c | 992 | mutex_lock(&power_resource_list_lock); |
0a613902 | 993 | |
781d737c | 994 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
587024b8 RW |
995 | int result; |
996 | u8 state; | |
0a613902 | 997 | |
781d737c | 998 | mutex_lock(&resource->resource_lock); |
0a613902 | 999 | |
ca84f187 RW |
1000 | resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; |
1001 | result = acpi_power_get_state(resource, &state); | |
d7d49012 LT |
1002 | if (result) { |
1003 | mutex_unlock(&resource->resource_lock); | |
660b1113 | 1004 | continue; |
d7d49012 | 1005 | } |
660b1113 RW |
1006 | |
1007 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c | 1008 | && resource->ref_count) { |
fad40a62 | 1009 | acpi_handle_debug(resource->device.handle, "Turning ON\n"); |
781d737c | 1010 | __acpi_power_on(resource); |
d5eefa82 RW |
1011 | } |
1012 | ||
1013 | mutex_unlock(&resource->resource_lock); | |
1014 | } | |
8ece1d83 HG |
1015 | |
1016 | mutex_unlock(&power_resource_list_lock); | |
1017 | } | |
29038ae2 | 1018 | #endif |
8ece1d83 | 1019 | |
9b7ff25d RW |
1020 | /** |
1021 | * acpi_turn_off_unused_power_resources - Turn off power resources not in use. | |
9b7ff25d | 1022 | */ |
6381195a | 1023 | void acpi_turn_off_unused_power_resources(void) |
8ece1d83 HG |
1024 | { |
1025 | struct acpi_power_resource *resource; | |
1026 | ||
1027 | mutex_lock(&power_resource_list_lock); | |
1028 | ||
d5eefa82 | 1029 | list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) { |
d5eefa82 RW |
1030 | mutex_lock(&resource->resource_lock); |
1031 | ||
6381195a | 1032 | if (!resource->ref_count && |
bc283685 | 1033 | resource->state == ACPI_POWER_RESOURCE_STATE_ON) { |
fad40a62 | 1034 | acpi_handle_debug(resource->device.handle, "Turning OFF\n"); |
6381195a RW |
1035 | __acpi_power_off(resource); |
1036 | } | |
0a613902 | 1037 | |
781d737c RW |
1038 | mutex_unlock(&resource->resource_lock); |
1039 | } | |
3e384ee6 | 1040 | |
781d737c | 1041 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 1042 | } |