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 | ||
9b04d997 | 26 | #include <linux/dmi.h> |
1da177e4 LT |
27 | #include <linux/kernel.h> |
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/types.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
0090def6 | 32 | #include <linux/pm_runtime.h> |
18a38709 | 33 | #include <linux/sysfs.h> |
8b48463f | 34 | #include <linux/acpi.h> |
9b83ccd2 | 35 | #include "sleep.h" |
0090def6 | 36 | #include "internal.h" |
9b83ccd2 | 37 | |
1da177e4 | 38 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 | 39 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
1da177e4 LT |
40 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 |
41 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
42 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 43 | |
4533771c MW |
44 | struct acpi_power_dependent_device { |
45 | struct device *dev; | |
46 | struct list_head node; | |
47 | }; | |
48 | ||
4be44fcd | 49 | struct acpi_power_resource { |
82c7d5ef | 50 | struct acpi_device device; |
781d737c | 51 | struct list_head list_node; |
4be44fcd LB |
52 | u32 system_level; |
53 | u32 order; | |
3e384ee6 | 54 | unsigned int ref_count; |
ca84f187 | 55 | u8 state; |
0a613902 | 56 | struct mutex resource_lock; |
4533771c | 57 | struct list_head dependents; |
1da177e4 LT |
58 | }; |
59 | ||
0b224527 RW |
60 | struct acpi_power_resource_entry { |
61 | struct list_head node; | |
62 | struct acpi_power_resource *resource; | |
63 | }; | |
64 | ||
781d737c RW |
65 | static LIST_HEAD(acpi_power_resource_list); |
66 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | /* -------------------------------------------------------------------------- |
69 | Power Resource Management | |
70 | -------------------------------------------------------------------------- */ | |
71 | ||
2bc4eb94 RW |
72 | static inline const char *resource_dev_name(struct acpi_power_resource *pr) |
73 | { | |
74 | return dev_name(&pr->device.dev); | |
75 | } | |
76 | ||
b1c0f99b RW |
77 | static inline |
78 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
79 | { | |
80 | return container_of(device, struct acpi_power_resource, device); | |
81 | } | |
82 | ||
82c7d5ef | 83 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 84 | { |
99ece713 | 85 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
1da177e4 | 86 | |
99ece713 | 87 | if (!device) |
82c7d5ef | 88 | return NULL; |
1da177e4 | 89 | |
b1c0f99b | 90 | return to_power_resource(device); |
1da177e4 LT |
91 | } |
92 | ||
e88c9c60 RW |
93 | static int acpi_power_resources_list_add(acpi_handle handle, |
94 | struct list_head *list) | |
0b224527 RW |
95 | { |
96 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
97 | struct acpi_power_resource_entry *entry; | |
98 | ||
99 | if (!resource || !list) | |
e88c9c60 | 100 | return -EINVAL; |
0b224527 RW |
101 | |
102 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
103 | if (!entry) | |
e88c9c60 | 104 | return -ENOMEM; |
0b224527 RW |
105 | |
106 | entry->resource = resource; | |
107 | if (!list_empty(list)) { | |
108 | struct acpi_power_resource_entry *e; | |
109 | ||
110 | list_for_each_entry(e, list, node) | |
111 | if (e->resource->order > resource->order) { | |
112 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 113 | return 0; |
0b224527 RW |
114 | } |
115 | } | |
116 | list_add_tail(&entry->node, list); | |
e88c9c60 | 117 | return 0; |
0b224527 RW |
118 | } |
119 | ||
120 | void acpi_power_resources_list_free(struct list_head *list) | |
121 | { | |
122 | struct acpi_power_resource_entry *entry, *e; | |
123 | ||
124 | list_for_each_entry_safe(entry, e, list, node) { | |
125 | list_del(&entry->node); | |
126 | kfree(entry); | |
127 | } | |
128 | } | |
129 | ||
7d7b467c HG |
130 | static bool acpi_power_resource_is_dup(union acpi_object *package, |
131 | unsigned int start, unsigned int i) | |
132 | { | |
133 | acpi_handle rhandle, dup; | |
134 | unsigned int j; | |
135 | ||
136 | /* The caller is expected to check the package element types */ | |
137 | rhandle = package->package.elements[i].reference.handle; | |
138 | for (j = start; j < i; j++) { | |
139 | dup = package->package.elements[j].reference.handle; | |
140 | if (dup == rhandle) | |
141 | return true; | |
142 | } | |
143 | ||
144 | return false; | |
145 | } | |
146 | ||
e88c9c60 RW |
147 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
148 | struct list_head *list) | |
ef85bdbe | 149 | { |
ef85bdbe | 150 | unsigned int i; |
e88c9c60 | 151 | int err = 0; |
ef85bdbe RW |
152 | |
153 | for (i = start; i < package->package.count; i++) { | |
154 | union acpi_object *element = &package->package.elements[i]; | |
9b7ff25d | 155 | struct acpi_device *rdev; |
ef85bdbe RW |
156 | acpi_handle rhandle; |
157 | ||
158 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 159 | err = -ENODATA; |
ef85bdbe RW |
160 | break; |
161 | } | |
162 | rhandle = element->reference.handle; | |
163 | if (!rhandle) { | |
e88c9c60 | 164 | err = -ENODEV; |
ef85bdbe RW |
165 | break; |
166 | } | |
7d7b467c HG |
167 | |
168 | /* Some ACPI tables contain duplicate power resource references */ | |
169 | if (acpi_power_resource_is_dup(package, start, i)) | |
170 | continue; | |
171 | ||
9b7ff25d RW |
172 | rdev = acpi_add_power_resource(rhandle); |
173 | if (!rdev) { | |
174 | err = -ENODEV; | |
e88c9c60 | 175 | break; |
9b7ff25d | 176 | } |
e88c9c60 RW |
177 | err = acpi_power_resources_list_add(rhandle, list); |
178 | if (err) | |
179 | break; | |
ef85bdbe | 180 | } |
e88c9c60 | 181 | if (err) |
ef85bdbe RW |
182 | acpi_power_resources_list_free(list); |
183 | ||
e88c9c60 | 184 | return err; |
ef85bdbe RW |
185 | } |
186 | ||
ca84f187 | 187 | static int __get_state(acpi_handle handle, u8 *state) |
1da177e4 | 188 | { |
4be44fcd | 189 | acpi_status status = AE_OK; |
27663c58 | 190 | unsigned long long sta = 0; |
587024b8 | 191 | u8 cur_state; |
1da177e4 | 192 | |
a51e145f | 193 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 194 | if (ACPI_FAILURE(status)) |
d550d98d | 195 | return -ENODEV; |
1da177e4 | 196 | |
587024b8 | 197 | cur_state = sta & ACPI_POWER_RESOURCE_STATE_ON; |
1da177e4 | 198 | |
56ce8339 | 199 | acpi_handle_debug(handle, "Power resource is %s\n", |
587024b8 | 200 | cur_state ? "on" : "off"); |
1da177e4 | 201 | |
587024b8 | 202 | *state = cur_state; |
d550d98d | 203 | return 0; |
1da177e4 LT |
204 | } |
205 | ||
ca84f187 RW |
206 | static int acpi_power_get_state(struct acpi_power_resource *resource, u8 *state) |
207 | { | |
208 | if (resource->state == ACPI_POWER_RESOURCE_STATE_UNKNOWN) { | |
209 | int ret; | |
210 | ||
211 | ret = __get_state(resource->device.handle, &resource->state); | |
212 | if (ret) | |
213 | return ret; | |
214 | } | |
215 | ||
216 | *state = resource->state; | |
217 | return 0; | |
218 | } | |
219 | ||
587024b8 | 220 | static int acpi_power_get_list_state(struct list_head *list, u8 *state) |
1da177e4 | 221 | { |
0b224527 | 222 | struct acpi_power_resource_entry *entry; |
587024b8 | 223 | u8 cur_state = ACPI_POWER_RESOURCE_STATE_OFF; |
1da177e4 LT |
224 | |
225 | if (!list || !state) | |
d550d98d | 226 | return -EINVAL; |
1da177e4 LT |
227 | |
228 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
0b224527 RW |
229 | list_for_each_entry(entry, list, node) { |
230 | struct acpi_power_resource *resource = entry->resource; | |
d0515d9f RW |
231 | int result; |
232 | ||
d0515d9f | 233 | mutex_lock(&resource->resource_lock); |
ca84f187 | 234 | result = acpi_power_get_state(resource, &cur_state); |
d0515d9f | 235 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
236 | if (result) |
237 | return result; | |
238 | ||
239 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
240 | break; |
241 | } | |
242 | ||
56ce8339 | 243 | pr_debug("Power resource list is %s\n", cur_state ? "on" : "off"); |
1da177e4 | 244 | |
d0515d9f | 245 | *state = cur_state; |
d0515d9f | 246 | return 0; |
1da177e4 LT |
247 | } |
248 | ||
4533771c MW |
249 | static int |
250 | acpi_power_resource_add_dependent(struct acpi_power_resource *resource, | |
251 | struct device *dev) | |
252 | { | |
253 | struct acpi_power_dependent_device *dep; | |
254 | int ret = 0; | |
255 | ||
256 | mutex_lock(&resource->resource_lock); | |
257 | list_for_each_entry(dep, &resource->dependents, node) { | |
258 | /* Only add it once */ | |
259 | if (dep->dev == dev) | |
260 | goto unlock; | |
261 | } | |
262 | ||
263 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); | |
264 | if (!dep) { | |
265 | ret = -ENOMEM; | |
266 | goto unlock; | |
267 | } | |
268 | ||
269 | dep->dev = dev; | |
270 | list_add_tail(&dep->node, &resource->dependents); | |
2bc4eb94 RW |
271 | dev_dbg(dev, "added power dependency to [%s]\n", |
272 | resource_dev_name(resource)); | |
4533771c MW |
273 | |
274 | unlock: | |
275 | mutex_unlock(&resource->resource_lock); | |
276 | return ret; | |
277 | } | |
278 | ||
279 | static void | |
280 | acpi_power_resource_remove_dependent(struct acpi_power_resource *resource, | |
281 | struct device *dev) | |
282 | { | |
283 | struct acpi_power_dependent_device *dep; | |
284 | ||
285 | mutex_lock(&resource->resource_lock); | |
286 | list_for_each_entry(dep, &resource->dependents, node) { | |
287 | if (dep->dev == dev) { | |
288 | list_del(&dep->node); | |
289 | kfree(dep); | |
290 | dev_dbg(dev, "removed power dependency to [%s]\n", | |
2bc4eb94 | 291 | resource_dev_name(resource)); |
4533771c MW |
292 | break; |
293 | } | |
294 | } | |
295 | mutex_unlock(&resource->resource_lock); | |
296 | } | |
297 | ||
298 | /** | |
299 | * acpi_device_power_add_dependent - Add dependent device of this ACPI device | |
300 | * @adev: ACPI device pointer | |
301 | * @dev: Dependent device | |
302 | * | |
303 | * If @adev has non-empty _PR0 the @dev is added as dependent device to all | |
304 | * power resources returned by it. This means that whenever these power | |
305 | * resources are turned _ON the dependent devices get runtime resumed. This | |
306 | * is needed for devices such as PCI to allow its driver to re-initialize | |
307 | * it after it went to D0uninitialized. | |
308 | * | |
309 | * If @adev does not have _PR0 this does nothing. | |
310 | * | |
311 | * Returns %0 in case of success and negative errno otherwise. | |
312 | */ | |
313 | int acpi_device_power_add_dependent(struct acpi_device *adev, | |
314 | struct device *dev) | |
315 | { | |
316 | struct acpi_power_resource_entry *entry; | |
317 | struct list_head *resources; | |
318 | int ret; | |
319 | ||
320 | if (!adev->flags.power_manageable) | |
321 | return 0; | |
322 | ||
323 | resources = &adev->power.states[ACPI_STATE_D0].resources; | |
324 | list_for_each_entry(entry, resources, node) { | |
325 | ret = acpi_power_resource_add_dependent(entry->resource, dev); | |
326 | if (ret) | |
327 | goto err; | |
328 | } | |
329 | ||
330 | return 0; | |
331 | ||
332 | err: | |
333 | list_for_each_entry(entry, resources, node) | |
334 | acpi_power_resource_remove_dependent(entry->resource, dev); | |
335 | ||
336 | return ret; | |
337 | } | |
338 | ||
339 | /** | |
340 | * acpi_device_power_remove_dependent - Remove dependent device | |
341 | * @adev: ACPI device pointer | |
342 | * @dev: Dependent device | |
343 | * | |
344 | * Does the opposite of acpi_device_power_add_dependent() and removes the | |
345 | * dependent device if it is found. Can be called to @adev that does not | |
346 | * have _PR0 as well. | |
347 | */ | |
348 | void acpi_device_power_remove_dependent(struct acpi_device *adev, | |
349 | struct device *dev) | |
350 | { | |
351 | struct acpi_power_resource_entry *entry; | |
352 | struct list_head *resources; | |
353 | ||
354 | if (!adev->flags.power_manageable) | |
355 | return; | |
356 | ||
357 | resources = &adev->power.states[ACPI_STATE_D0].resources; | |
358 | list_for_each_entry_reverse(entry, resources, node) | |
359 | acpi_power_resource_remove_dependent(entry->resource, dev); | |
360 | } | |
361 | ||
3e384ee6 | 362 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 363 | { |
fad40a62 | 364 | acpi_handle handle = resource->device.handle; |
4533771c | 365 | struct acpi_power_dependent_device *dep; |
4be44fcd | 366 | acpi_status status = AE_OK; |
1da177e4 | 367 | |
fad40a62 | 368 | status = acpi_evaluate_object(handle, "_ON", NULL, NULL); |
ca84f187 RW |
369 | if (ACPI_FAILURE(status)) { |
370 | resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; | |
3e384ee6 | 371 | return -ENODEV; |
ca84f187 RW |
372 | } |
373 | ||
374 | resource->state = ACPI_POWER_RESOURCE_STATE_ON; | |
3e384ee6 | 375 | |
fad40a62 | 376 | acpi_handle_debug(handle, "Power resource turned on\n"); |
3e384ee6 | 377 | |
4533771c MW |
378 | /* |
379 | * If there are other dependents on this power resource we need to | |
380 | * resume them now so that their drivers can re-initialize the | |
381 | * hardware properly after it went back to D0. | |
382 | */ | |
383 | if (list_empty(&resource->dependents) || | |
384 | list_is_singular(&resource->dependents)) | |
385 | return 0; | |
386 | ||
387 | list_for_each_entry(dep, &resource->dependents, node) { | |
388 | dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n", | |
2bc4eb94 | 389 | resource_dev_name(resource)); |
4533771c MW |
390 | pm_request_resume(dep->dev); |
391 | } | |
392 | ||
3e384ee6 RW |
393 | return 0; |
394 | } | |
395 | ||
b5d667eb | 396 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 397 | { |
b5d667eb | 398 | int result = 0; |
0a613902 | 399 | |
3e384ee6 | 400 | if (resource->ref_count++) { |
fad40a62 RW |
401 | acpi_handle_debug(resource->device.handle, |
402 | "Power resource already on\n"); | |
3e384ee6 RW |
403 | } else { |
404 | result = __acpi_power_on(resource); | |
41863fce | 405 | if (result) |
12b3b5af | 406 | resource->ref_count--; |
40bf66ec | 407 | } |
b5d667eb RW |
408 | return result; |
409 | } | |
40bf66ec | 410 | |
b5d667eb RW |
411 | static int acpi_power_on(struct acpi_power_resource *resource) |
412 | { | |
413 | int result; | |
40bf66ec | 414 | |
b5d667eb RW |
415 | mutex_lock(&resource->resource_lock); |
416 | result = acpi_power_on_unlocked(resource); | |
417 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 418 | return result; |
1da177e4 LT |
419 | } |
420 | ||
660b1113 RW |
421 | static int __acpi_power_off(struct acpi_power_resource *resource) |
422 | { | |
fad40a62 | 423 | acpi_handle handle = resource->device.handle; |
660b1113 RW |
424 | acpi_status status; |
425 | ||
fad40a62 | 426 | status = acpi_evaluate_object(handle, "_OFF", NULL, NULL); |
ca84f187 RW |
427 | if (ACPI_FAILURE(status)) { |
428 | resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; | |
660b1113 | 429 | return -ENODEV; |
ca84f187 RW |
430 | } |
431 | ||
432 | resource->state = ACPI_POWER_RESOURCE_STATE_OFF; | |
660b1113 | 433 | |
fad40a62 | 434 | acpi_handle_debug(handle, "Power resource turned off\n"); |
56ce8339 | 435 | |
660b1113 RW |
436 | return 0; |
437 | } | |
438 | ||
b5d667eb | 439 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 440 | { |
0b224527 | 441 | int result = 0; |
1da177e4 | 442 | |
3e384ee6 | 443 | if (!resource->ref_count) { |
fad40a62 RW |
444 | acpi_handle_debug(resource->device.handle, |
445 | "Power resource already off\n"); | |
b5d667eb | 446 | return 0; |
0a613902 | 447 | } |
1da177e4 | 448 | |
3e384ee6 | 449 | if (--resource->ref_count) { |
fad40a62 RW |
450 | acpi_handle_debug(resource->device.handle, |
451 | "Power resource still in use\n"); | |
660b1113 RW |
452 | } else { |
453 | result = __acpi_power_off(resource); | |
454 | if (result) | |
455 | resource->ref_count++; | |
1da177e4 | 456 | } |
b5d667eb RW |
457 | return result; |
458 | } | |
1da177e4 | 459 | |
b5d667eb RW |
460 | static int acpi_power_off(struct acpi_power_resource *resource) |
461 | { | |
462 | int result; | |
1da177e4 | 463 | |
b5d667eb RW |
464 | mutex_lock(&resource->resource_lock); |
465 | result = acpi_power_off_unlocked(resource); | |
466 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 467 | return result; |
1da177e4 LT |
468 | } |
469 | ||
0b224527 | 470 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 471 | { |
0b224527 RW |
472 | struct acpi_power_resource_entry *entry; |
473 | int result = 0; | |
d2ef555b | 474 | |
0b224527 RW |
475 | list_for_each_entry_reverse(entry, list, node) { |
476 | result = acpi_power_off(entry->resource); | |
477 | if (result) | |
478 | goto err; | |
479 | } | |
480 | return 0; | |
d2ef555b | 481 | |
0b224527 RW |
482 | err: |
483 | list_for_each_entry_continue(entry, list, node) | |
484 | acpi_power_on(entry->resource); | |
485 | ||
486 | return result; | |
d2ef555b RW |
487 | } |
488 | ||
0b224527 | 489 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 490 | { |
0b224527 | 491 | struct acpi_power_resource_entry *entry; |
d2ef555b | 492 | int result = 0; |
d2ef555b | 493 | |
0b224527 RW |
494 | list_for_each_entry(entry, list, node) { |
495 | result = acpi_power_on(entry->resource); | |
496 | if (result) | |
497 | goto err; | |
d2ef555b | 498 | } |
0b224527 RW |
499 | return 0; |
500 | ||
501 | err: | |
502 | list_for_each_entry_continue_reverse(entry, list, node) | |
503 | acpi_power_off(entry->resource); | |
d2ef555b RW |
504 | |
505 | return result; | |
506 | } | |
507 | ||
18a38709 RW |
508 | static struct attribute *attrs[] = { |
509 | NULL, | |
510 | }; | |
511 | ||
26408b24 | 512 | static const struct attribute_group attr_groups[] = { |
18a38709 RW |
513 | [ACPI_STATE_D0] = { |
514 | .name = "power_resources_D0", | |
515 | .attrs = attrs, | |
516 | }, | |
517 | [ACPI_STATE_D1] = { | |
518 | .name = "power_resources_D1", | |
519 | .attrs = attrs, | |
520 | }, | |
521 | [ACPI_STATE_D2] = { | |
522 | .name = "power_resources_D2", | |
523 | .attrs = attrs, | |
524 | }, | |
525 | [ACPI_STATE_D3_HOT] = { | |
526 | .name = "power_resources_D3hot", | |
527 | .attrs = attrs, | |
528 | }, | |
529 | }; | |
530 | ||
26408b24 | 531 | static const struct attribute_group wakeup_attr_group = { |
41a2a466 RW |
532 | .name = "power_resources_wakeup", |
533 | .attrs = attrs, | |
534 | }; | |
535 | ||
536 | static void acpi_power_hide_list(struct acpi_device *adev, | |
537 | struct list_head *resources, | |
26408b24 | 538 | const struct attribute_group *attr_group) |
18a38709 | 539 | { |
18a38709 RW |
540 | struct acpi_power_resource_entry *entry; |
541 | ||
41a2a466 | 542 | if (list_empty(resources)) |
18a38709 RW |
543 | return; |
544 | ||
41a2a466 | 545 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
546 | struct acpi_device *res_dev = &entry->resource->device; |
547 | ||
548 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 549 | attr_group->name, |
18a38709 RW |
550 | dev_name(&res_dev->dev)); |
551 | } | |
41a2a466 | 552 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
553 | } |
554 | ||
41a2a466 RW |
555 | static void acpi_power_expose_list(struct acpi_device *adev, |
556 | struct list_head *resources, | |
26408b24 | 557 | const struct attribute_group *attr_group) |
0090def6 | 558 | { |
18a38709 RW |
559 | struct acpi_power_resource_entry *entry; |
560 | int ret; | |
561 | ||
41a2a466 | 562 | if (list_empty(resources)) |
18a38709 RW |
563 | return; |
564 | ||
41a2a466 | 565 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
566 | if (ret) |
567 | return; | |
568 | ||
41a2a466 | 569 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
570 | struct acpi_device *res_dev = &entry->resource->device; |
571 | ||
572 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 573 | attr_group->name, |
18a38709 RW |
574 | &res_dev->dev.kobj, |
575 | dev_name(&res_dev->dev)); | |
576 | if (ret) { | |
41a2a466 | 577 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 578 | break; |
0090def6 LM |
579 | } |
580 | } | |
0090def6 | 581 | } |
bc9b6407 | 582 | |
41a2a466 RW |
583 | static void acpi_power_expose_hide(struct acpi_device *adev, |
584 | struct list_head *resources, | |
26408b24 | 585 | const struct attribute_group *attr_group, |
41a2a466 RW |
586 | bool expose) |
587 | { | |
588 | if (expose) | |
589 | acpi_power_expose_list(adev, resources, attr_group); | |
590 | else | |
591 | acpi_power_hide_list(adev, resources, attr_group); | |
592 | } | |
593 | ||
18a38709 RW |
594 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
595 | { | |
18a38709 RW |
596 | int state; |
597 | ||
41a2a466 RW |
598 | if (adev->wakeup.flags.valid) |
599 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
600 | &wakeup_attr_group, add); | |
601 | ||
18a38709 RW |
602 | if (!adev->power.flags.power_resources) |
603 | return; | |
604 | ||
41a2a466 RW |
605 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
606 | acpi_power_expose_hide(adev, | |
607 | &adev->power.states[state].resources, | |
608 | &attr_groups[state], add); | |
18a38709 RW |
609 | } |
610 | ||
b5d667eb | 611 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
612 | { |
613 | struct acpi_power_resource_entry *entry; | |
614 | int system_level = 5; | |
615 | ||
616 | list_for_each_entry(entry, list, node) { | |
617 | struct acpi_power_resource *resource = entry->resource; | |
587024b8 | 618 | u8 state; |
0596a52b | 619 | |
b5d667eb RW |
620 | mutex_lock(&resource->resource_lock); |
621 | ||
7a63296d RW |
622 | /* |
623 | * Make sure that the power resource state and its reference | |
624 | * counter value are consistent with each other. | |
625 | */ | |
626 | if (!resource->ref_count && | |
627 | !acpi_power_get_state(resource, &state) && | |
628 | state == ACPI_POWER_RESOURCE_STATE_ON) | |
629 | __acpi_power_off(resource); | |
630 | ||
0596a52b RW |
631 | if (system_level > resource->system_level) |
632 | system_level = resource->system_level; | |
b5d667eb RW |
633 | |
634 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 635 | } |
b5d667eb RW |
636 | *system_level_p = system_level; |
637 | return 0; | |
0596a52b RW |
638 | } |
639 | ||
bc9b6407 RW |
640 | /* -------------------------------------------------------------------------- |
641 | Device Power Management | |
642 | -------------------------------------------------------------------------- */ | |
0090def6 | 643 | |
77e76609 RW |
644 | /** |
645 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
646 | * ACPI 3.0) _PSW (Power State Wake) | |
647 | * @dev: Device to handle. | |
648 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
649 | * @sleep_state: Target sleep state of the system. | |
650 | * @dev_state: Target power state of the device. | |
651 | * | |
652 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
653 | * State Wake) for the device, if present. On failure reset the device's | |
654 | * wakeup.flags.valid flag. | |
655 | * | |
656 | * RETURN VALUE: | |
657 | * 0 if either _DSW or _PSW has been successfully executed | |
658 | * 0 if neither _DSW nor _PSW has been found | |
659 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
660 | */ | |
661 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
c6237b21 | 662 | int enable, int sleep_state, int dev_state) |
77e76609 RW |
663 | { |
664 | union acpi_object in_arg[3]; | |
665 | struct acpi_object_list arg_list = { 3, in_arg }; | |
666 | acpi_status status = AE_OK; | |
667 | ||
668 | /* | |
669 | * Try to execute _DSW first. | |
670 | * | |
603fadf3 | 671 | * Three arguments are needed for the _DSW object: |
77e76609 RW |
672 | * Argument 0: enable/disable the wake capabilities |
673 | * Argument 1: target system state | |
674 | * Argument 2: target device state | |
675 | * When _DSW object is called to disable the wake capabilities, maybe | |
603fadf3 | 676 | * the first argument is filled. The values of the other two arguments |
77e76609 RW |
677 | * are meaningless. |
678 | */ | |
679 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
680 | in_arg[0].integer.value = enable; | |
681 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
682 | in_arg[1].integer.value = sleep_state; | |
683 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
684 | in_arg[2].integer.value = dev_state; | |
685 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
686 | if (ACPI_SUCCESS(status)) { | |
687 | return 0; | |
688 | } else if (status != AE_NOT_FOUND) { | |
56ce8339 | 689 | acpi_handle_info(dev->handle, "_DSW execution failed\n"); |
77e76609 RW |
690 | dev->wakeup.flags.valid = 0; |
691 | return -ENODEV; | |
692 | } | |
693 | ||
694 | /* Execute _PSW */ | |
0db98202 | 695 | status = acpi_execute_simple_method(dev->handle, "_PSW", enable); |
77e76609 | 696 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
56ce8339 | 697 | acpi_handle_info(dev->handle, "_PSW execution failed\n"); |
77e76609 RW |
698 | dev->wakeup.flags.valid = 0; |
699 | return -ENODEV; | |
700 | } | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
1da177e4 LT |
705 | /* |
706 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
c6237b21 | 707 | * 1. Power on the power resources required for the wakeup device |
77e76609 RW |
708 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
709 | * State Wake) for the device, if present | |
1da177e4 | 710 | */ |
77e76609 | 711 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 712 | { |
993cbe59 | 713 | int err = 0; |
1da177e4 | 714 | |
1da177e4 | 715 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 716 | return -EINVAL; |
1da177e4 | 717 | |
9b83ccd2 RW |
718 | mutex_lock(&acpi_device_lock); |
719 | ||
5b6a8f14 RW |
720 | dev_dbg(&dev->dev, "Enabling wakeup power (count %d)\n", |
721 | dev->wakeup.prepare_count); | |
722 | ||
9b83ccd2 RW |
723 | if (dev->wakeup.prepare_count++) |
724 | goto out; | |
0af4b8c4 | 725 | |
a2d7b2e0 RW |
726 | err = acpi_power_on_list(&dev->wakeup.resources); |
727 | if (err) { | |
728 | dev_err(&dev->dev, "Cannot turn on wakeup power resources\n"); | |
729 | dev->wakeup.flags.valid = 0; | |
730 | goto out; | |
1da177e4 | 731 | } |
a2d7b2e0 | 732 | |
b5d667eb RW |
733 | /* |
734 | * Passing 3 as the third argument below means the device may be | |
735 | * put into arbitrary power state afterward. | |
736 | */ | |
737 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
a9a8f827 RW |
738 | if (err) { |
739 | acpi_power_off_list(&dev->wakeup.resources); | |
9b83ccd2 | 740 | dev->wakeup.prepare_count = 0; |
5b6a8f14 | 741 | goto out; |
a9a8f827 | 742 | } |
9b83ccd2 | 743 | |
5b6a8f14 RW |
744 | dev_dbg(&dev->dev, "Wakeup power enabled\n"); |
745 | ||
9b83ccd2 RW |
746 | out: |
747 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 748 | return err; |
1da177e4 LT |
749 | } |
750 | ||
751 | /* | |
752 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
753 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
754 | * State Wake) for the device, if present | |
1da177e4 LT |
755 | * 2. Shutdown down the power resources |
756 | */ | |
4be44fcd | 757 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 758 | { |
b5d667eb | 759 | struct acpi_power_resource_entry *entry; |
993cbe59 | 760 | int err = 0; |
1da177e4 LT |
761 | |
762 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 763 | return -EINVAL; |
1da177e4 | 764 | |
9b83ccd2 RW |
765 | mutex_lock(&acpi_device_lock); |
766 | ||
5b6a8f14 RW |
767 | dev_dbg(&dev->dev, "Disabling wakeup power (count %d)\n", |
768 | dev->wakeup.prepare_count); | |
769 | ||
452a3e72 RW |
770 | /* Do nothing if wakeup power has not been enabled for this device. */ |
771 | if (dev->wakeup.prepare_count <= 0) | |
9b83ccd2 RW |
772 | goto out; |
773 | ||
452a3e72 | 774 | if (--dev->wakeup.prepare_count > 0) |
a2d7b2e0 | 775 | goto out; |
0af4b8c4 | 776 | |
9b83ccd2 RW |
777 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
778 | if (err) | |
779 | goto out; | |
1da177e4 | 780 | |
a2d7b2e0 RW |
781 | /* |
782 | * All of the power resources in the list need to be turned off even if | |
783 | * there are errors. | |
784 | */ | |
b5d667eb | 785 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
a2d7b2e0 | 786 | int ret; |
b5d667eb | 787 | |
a2d7b2e0 RW |
788 | ret = acpi_power_off(entry->resource); |
789 | if (ret && !err) | |
790 | err = ret; | |
791 | } | |
792 | if (err) { | |
793 | dev_err(&dev->dev, "Cannot turn off wakeup power resources\n"); | |
794 | dev->wakeup.flags.valid = 0; | |
5b6a8f14 | 795 | goto out; |
1da177e4 LT |
796 | } |
797 | ||
5b6a8f14 RW |
798 | dev_dbg(&dev->dev, "Wakeup power disabled\n"); |
799 | ||
9b83ccd2 RW |
800 | out: |
801 | mutex_unlock(&acpi_device_lock); | |
802 | return err; | |
1da177e4 LT |
803 | } |
804 | ||
32a00d27 | 805 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 806 | { |
587024b8 | 807 | u8 list_state = ACPI_POWER_RESOURCE_STATE_OFF; |
4be44fcd | 808 | int result = 0; |
4be44fcd | 809 | int i = 0; |
1da177e4 | 810 | |
32a00d27 | 811 | if (!device || !state) |
d550d98d | 812 | return -EINVAL; |
1da177e4 | 813 | |
1da177e4 LT |
814 | /* |
815 | * We know a device's inferred power state when all the resources | |
816 | * required for a given D-state are 'on'. | |
817 | */ | |
38c92fff | 818 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
819 | struct list_head *list = &device->power.states[i].resources; |
820 | ||
821 | if (list_empty(list)) | |
1da177e4 LT |
822 | continue; |
823 | ||
824 | result = acpi_power_get_list_state(list, &list_state); | |
825 | if (result) | |
d550d98d | 826 | return result; |
1da177e4 LT |
827 | |
828 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 829 | *state = i; |
d550d98d | 830 | return 0; |
1da177e4 LT |
831 | } |
832 | } | |
833 | ||
20dacb71 RW |
834 | *state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ? |
835 | ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT; | |
d550d98d | 836 | return 0; |
1da177e4 LT |
837 | } |
838 | ||
30d3df41 RW |
839 | int acpi_power_on_resources(struct acpi_device *device, int state) |
840 | { | |
87e753b0 | 841 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
842 | return -EINVAL; |
843 | ||
844 | return acpi_power_on_list(&device->power.states[state].resources); | |
845 | } | |
846 | ||
4be44fcd | 847 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 848 | { |
5c7dd710 | 849 | int result = 0; |
1da177e4 | 850 | |
3ebc81b8 | 851 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 852 | return -EINVAL; |
1da177e4 | 853 | |
0b224527 | 854 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
855 | return 0; |
856 | ||
4be44fcd | 857 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 858 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 859 | return -ENODEV; |
1da177e4 | 860 | |
1da177e4 LT |
861 | /* |
862 | * First we reference all power resources required in the target list | |
d2ef555b RW |
863 | * (e.g. so the device doesn't lose power while transitioning). Then, |
864 | * we dereference all power resources used in the current list. | |
1da177e4 | 865 | */ |
5c7dd710 RW |
866 | if (state < ACPI_STATE_D3_COLD) |
867 | result = acpi_power_on_list( | |
868 | &device->power.states[state].resources); | |
869 | ||
870 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
871 | acpi_power_off_list( |
872 | &device->power.states[device->power.state].resources); | |
1da177e4 | 873 | |
d2ef555b RW |
874 | /* We shouldn't change the state unless the above operations succeed. */ |
875 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 876 | |
d550d98d | 877 | return result; |
1da177e4 LT |
878 | } |
879 | ||
82c7d5ef RW |
880 | static void acpi_release_power_resource(struct device *dev) |
881 | { | |
882 | struct acpi_device *device = to_acpi_device(dev); | |
883 | struct acpi_power_resource *resource; | |
884 | ||
82c7d5ef | 885 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
886 | |
887 | mutex_lock(&power_resource_list_lock); | |
888 | list_del(&resource->list_node); | |
889 | mutex_unlock(&power_resource_list_lock); | |
890 | ||
c0af4175 | 891 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
892 | kfree(resource); |
893 | } | |
1da177e4 | 894 | |
0f39ee83 DR |
895 | static ssize_t resource_in_use_show(struct device *dev, |
896 | struct device_attribute *attr, | |
897 | char *buf) | |
898 | { | |
b1c0f99b RW |
899 | struct acpi_power_resource *resource; |
900 | ||
901 | resource = to_power_resource(to_acpi_device(dev)); | |
902 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
903 | } | |
0f39ee83 | 904 | static DEVICE_ATTR_RO(resource_in_use); |
b1c0f99b RW |
905 | |
906 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
907 | { | |
908 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
909 | } | |
910 | ||
d5eefa82 RW |
911 | static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource) |
912 | { | |
913 | mutex_lock(&power_resource_list_lock); | |
914 | ||
915 | if (!list_empty(&acpi_power_resource_list)) { | |
916 | struct acpi_power_resource *r; | |
917 | ||
918 | list_for_each_entry(r, &acpi_power_resource_list, list_node) | |
919 | if (r->order > resource->order) { | |
920 | list_add_tail(&resource->list_node, &r->list_node); | |
921 | goto out; | |
922 | } | |
923 | } | |
924 | list_add_tail(&resource->list_node, &acpi_power_resource_list); | |
925 | ||
926 | out: | |
927 | mutex_unlock(&power_resource_list_lock); | |
928 | } | |
929 | ||
9b7ff25d | 930 | struct acpi_device *acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 931 | { |
99ece713 | 932 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
82c7d5ef | 933 | struct acpi_power_resource *resource; |
4be44fcd LB |
934 | union acpi_object acpi_object; |
935 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef | 936 | acpi_status status; |
a1224f34 | 937 | u8 state_dummy; |
587024b8 | 938 | int result; |
1da177e4 | 939 | |
82c7d5ef | 940 | if (device) |
9b7ff25d | 941 | return device; |
1da177e4 | 942 | |
82c7d5ef | 943 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 944 | if (!resource) |
9b7ff25d | 945 | return NULL; |
1da177e4 | 946 | |
82c7d5ef | 947 | device = &resource->device; |
5c5e1237 RW |
948 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, |
949 | acpi_release_power_resource); | |
0a613902 | 950 | mutex_init(&resource->resource_lock); |
6ee22e9d | 951 | INIT_LIST_HEAD(&resource->list_node); |
4533771c | 952 | INIT_LIST_HEAD(&resource->dependents); |
1da177e4 LT |
953 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
954 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 955 | device->power.state = ACPI_STATE_UNKNOWN; |
6e1850b2 | 956 | device->flags.match_driver = true; |
1da177e4 | 957 | |
935ab850 | 958 | /* Evaluate the object to get the system level and resource order. */ |
82c7d5ef RW |
959 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
960 | if (ACPI_FAILURE(status)) | |
781d737c | 961 | goto err; |
82c7d5ef | 962 | |
1da177e4 LT |
963 | resource->system_level = acpi_object.power_resource.system_level; |
964 | resource->order = acpi_object.power_resource.resource_order; | |
ca84f187 | 965 | resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; |
1da177e4 | 966 | |
a1224f34 RW |
967 | /* Get the initial state or just flip it on if that fails. */ |
968 | if (acpi_power_get_state(resource, &state_dummy)) | |
969 | __acpi_power_on(resource); | |
970 | ||
dc776bd3 | 971 | acpi_handle_info(handle, "New power resource\n"); |
1da177e4 | 972 | |
6e1850b2 RW |
973 | result = acpi_tie_acpi_dev(device); |
974 | if (result) | |
975 | goto err; | |
976 | ||
5c5e1237 | 977 | result = acpi_device_add(device); |
1da177e4 | 978 | if (result) |
781d737c | 979 | goto err; |
4be44fcd | 980 | |
b1c0f99b RW |
981 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
982 | device->remove = acpi_power_sysfs_remove; | |
983 | ||
d5eefa82 | 984 | acpi_power_add_resource_to_list(resource); |
cf860be6 | 985 | acpi_device_add_finalize(device); |
9b7ff25d | 986 | return device; |
1da177e4 | 987 | |
781d737c RW |
988 | err: |
989 | acpi_release_power_resource(&device->dev); | |
9b7ff25d | 990 | return NULL; |
781d737c | 991 | } |
1da177e4 | 992 | |
781d737c RW |
993 | #ifdef CONFIG_ACPI_SLEEP |
994 | void acpi_resume_power_resources(void) | |
0a613902 | 995 | { |
3e384ee6 | 996 | struct acpi_power_resource *resource; |
0a613902 | 997 | |
781d737c | 998 | mutex_lock(&power_resource_list_lock); |
0a613902 | 999 | |
781d737c | 1000 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
587024b8 RW |
1001 | int result; |
1002 | u8 state; | |
0a613902 | 1003 | |
781d737c | 1004 | mutex_lock(&resource->resource_lock); |
0a613902 | 1005 | |
ca84f187 RW |
1006 | resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN; |
1007 | result = acpi_power_get_state(resource, &state); | |
d7d49012 LT |
1008 | if (result) { |
1009 | mutex_unlock(&resource->resource_lock); | |
660b1113 | 1010 | continue; |
d7d49012 | 1011 | } |
660b1113 RW |
1012 | |
1013 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c | 1014 | && resource->ref_count) { |
fad40a62 | 1015 | acpi_handle_debug(resource->device.handle, "Turning ON\n"); |
781d737c | 1016 | __acpi_power_on(resource); |
d5eefa82 RW |
1017 | } |
1018 | ||
1019 | mutex_unlock(&resource->resource_lock); | |
1020 | } | |
8ece1d83 HG |
1021 | |
1022 | mutex_unlock(&power_resource_list_lock); | |
1023 | } | |
29038ae2 | 1024 | #endif |
8ece1d83 | 1025 | |
9b04d997 HG |
1026 | static const struct dmi_system_id dmi_leave_unused_power_resources_on[] = { |
1027 | { | |
1028 | /* | |
1029 | * The Toshiba Click Mini has a CPR3 power-resource which must | |
1030 | * be on for the touchscreen to work, but which is not in any | |
1031 | * _PR? lists. The other 2 affected power-resources are no-ops. | |
1032 | */ | |
1033 | .matches = { | |
1034 | DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), | |
1035 | DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Click Mini L9W-B"), | |
1036 | }, | |
1037 | }, | |
1038 | {} | |
1039 | }; | |
1040 | ||
9b7ff25d RW |
1041 | /** |
1042 | * acpi_turn_off_unused_power_resources - Turn off power resources not in use. | |
9b7ff25d | 1043 | */ |
6381195a | 1044 | void acpi_turn_off_unused_power_resources(void) |
8ece1d83 HG |
1045 | { |
1046 | struct acpi_power_resource *resource; | |
1047 | ||
9b04d997 HG |
1048 | if (dmi_check_system(dmi_leave_unused_power_resources_on)) |
1049 | return; | |
1050 | ||
8ece1d83 HG |
1051 | mutex_lock(&power_resource_list_lock); |
1052 | ||
d5eefa82 | 1053 | list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) { |
d5eefa82 RW |
1054 | mutex_lock(&resource->resource_lock); |
1055 | ||
6381195a | 1056 | if (!resource->ref_count && |
bc283685 | 1057 | resource->state == ACPI_POWER_RESOURCE_STATE_ON) { |
fad40a62 | 1058 | acpi_handle_debug(resource->device.handle, "Turning OFF\n"); |
6381195a RW |
1059 | __acpi_power_off(resource); |
1060 | } | |
0a613902 | 1061 | |
781d737c RW |
1062 | mutex_unlock(&resource->resource_lock); |
1063 | } | |
3e384ee6 | 1064 | |
781d737c | 1065 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 1066 | } |