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. |
1da177e4 | 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 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/types.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
0090def6 | 29 | #include <linux/pm_runtime.h> |
18a38709 | 30 | #include <linux/sysfs.h> |
8b48463f | 31 | #include <linux/acpi.h> |
9b83ccd2 | 32 | #include "sleep.h" |
0090def6 | 33 | #include "internal.h" |
9b83ccd2 | 34 | |
89595b8f | 35 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 36 | ACPI_MODULE_NAME("power"); |
1da177e4 | 37 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 LT |
38 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
39 | #define ACPI_POWER_FILE_INFO "info" | |
40 | #define ACPI_POWER_FILE_STATUS "state" | |
41 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
42 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
43 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 44 | |
4533771c MW |
45 | struct acpi_power_dependent_device { |
46 | struct device *dev; | |
47 | struct list_head node; | |
48 | }; | |
49 | ||
4be44fcd | 50 | struct acpi_power_resource { |
82c7d5ef | 51 | struct acpi_device device; |
781d737c | 52 | struct list_head list_node; |
82c7d5ef | 53 | char *name; |
4be44fcd LB |
54 | u32 system_level; |
55 | u32 order; | |
3e384ee6 | 56 | unsigned int ref_count; |
b5d667eb | 57 | bool wakeup_enabled; |
0a613902 | 58 | struct mutex resource_lock; |
4533771c | 59 | struct list_head dependents; |
1da177e4 LT |
60 | }; |
61 | ||
0b224527 RW |
62 | struct acpi_power_resource_entry { |
63 | struct list_head node; | |
64 | struct acpi_power_resource *resource; | |
65 | }; | |
66 | ||
781d737c RW |
67 | static LIST_HEAD(acpi_power_resource_list); |
68 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 69 | |
1da177e4 LT |
70 | /* -------------------------------------------------------------------------- |
71 | Power Resource Management | |
72 | -------------------------------------------------------------------------- */ | |
73 | ||
b1c0f99b RW |
74 | static inline |
75 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
76 | { | |
77 | return container_of(device, struct acpi_power_resource, device); | |
78 | } | |
79 | ||
82c7d5ef | 80 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 81 | { |
82c7d5ef | 82 | struct acpi_device *device; |
1da177e4 | 83 | |
82c7d5ef RW |
84 | if (acpi_bus_get_device(handle, &device)) |
85 | return NULL; | |
1da177e4 | 86 | |
b1c0f99b | 87 | return to_power_resource(device); |
1da177e4 LT |
88 | } |
89 | ||
e88c9c60 RW |
90 | static int acpi_power_resources_list_add(acpi_handle handle, |
91 | struct list_head *list) | |
0b224527 RW |
92 | { |
93 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
94 | struct acpi_power_resource_entry *entry; | |
95 | ||
96 | if (!resource || !list) | |
e88c9c60 | 97 | return -EINVAL; |
0b224527 RW |
98 | |
99 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
100 | if (!entry) | |
e88c9c60 | 101 | return -ENOMEM; |
0b224527 RW |
102 | |
103 | entry->resource = resource; | |
104 | if (!list_empty(list)) { | |
105 | struct acpi_power_resource_entry *e; | |
106 | ||
107 | list_for_each_entry(e, list, node) | |
108 | if (e->resource->order > resource->order) { | |
109 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 110 | return 0; |
0b224527 RW |
111 | } |
112 | } | |
113 | list_add_tail(&entry->node, list); | |
e88c9c60 | 114 | return 0; |
0b224527 RW |
115 | } |
116 | ||
117 | void acpi_power_resources_list_free(struct list_head *list) | |
118 | { | |
119 | struct acpi_power_resource_entry *entry, *e; | |
120 | ||
121 | list_for_each_entry_safe(entry, e, list, node) { | |
122 | list_del(&entry->node); | |
123 | kfree(entry); | |
124 | } | |
125 | } | |
126 | ||
7d7b467c HG |
127 | static bool acpi_power_resource_is_dup(union acpi_object *package, |
128 | unsigned int start, unsigned int i) | |
129 | { | |
130 | acpi_handle rhandle, dup; | |
131 | unsigned int j; | |
132 | ||
133 | /* The caller is expected to check the package element types */ | |
134 | rhandle = package->package.elements[i].reference.handle; | |
135 | for (j = start; j < i; j++) { | |
136 | dup = package->package.elements[j].reference.handle; | |
137 | if (dup == rhandle) | |
138 | return true; | |
139 | } | |
140 | ||
141 | return false; | |
142 | } | |
143 | ||
e88c9c60 RW |
144 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
145 | struct list_head *list) | |
ef85bdbe | 146 | { |
ef85bdbe | 147 | unsigned int i; |
e88c9c60 | 148 | int err = 0; |
ef85bdbe RW |
149 | |
150 | for (i = start; i < package->package.count; i++) { | |
151 | union acpi_object *element = &package->package.elements[i]; | |
152 | acpi_handle rhandle; | |
153 | ||
154 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 155 | err = -ENODATA; |
ef85bdbe RW |
156 | break; |
157 | } | |
158 | rhandle = element->reference.handle; | |
159 | if (!rhandle) { | |
e88c9c60 | 160 | err = -ENODEV; |
ef85bdbe RW |
161 | break; |
162 | } | |
7d7b467c HG |
163 | |
164 | /* Some ACPI tables contain duplicate power resource references */ | |
165 | if (acpi_power_resource_is_dup(package, start, i)) | |
166 | continue; | |
167 | ||
e88c9c60 RW |
168 | err = acpi_add_power_resource(rhandle); |
169 | if (err) | |
170 | break; | |
171 | ||
172 | err = acpi_power_resources_list_add(rhandle, list); | |
173 | if (err) | |
174 | break; | |
ef85bdbe | 175 | } |
e88c9c60 | 176 | if (err) |
ef85bdbe RW |
177 | acpi_power_resources_list_free(list); |
178 | ||
e88c9c60 | 179 | return err; |
ef85bdbe RW |
180 | } |
181 | ||
a51e145f | 182 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 183 | { |
4be44fcd | 184 | acpi_status status = AE_OK; |
27663c58 | 185 | unsigned long long sta = 0; |
60a4ce7f LM |
186 | char node_name[5]; |
187 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 188 | |
1da177e4 | 189 | |
a51e145f | 190 | if (!handle || !state) |
d550d98d | 191 | return -EINVAL; |
1da177e4 | 192 | |
a51e145f | 193 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 194 | if (ACPI_FAILURE(status)) |
d550d98d | 195 | return -ENODEV; |
1da177e4 | 196 | |
c35923bc AS |
197 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
198 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 199 | |
60a4ce7f LM |
200 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
201 | ||
1da177e4 | 202 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 203 | node_name, |
b1b57fbe | 204 | *state ? "on" : "off")); |
1da177e4 | 205 | |
d550d98d | 206 | return 0; |
1da177e4 LT |
207 | } |
208 | ||
0b224527 | 209 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 210 | { |
0b224527 | 211 | struct acpi_power_resource_entry *entry; |
d0515d9f | 212 | int cur_state; |
1da177e4 LT |
213 | |
214 | if (!list || !state) | |
d550d98d | 215 | return -EINVAL; |
1da177e4 LT |
216 | |
217 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
fe8c470a | 218 | cur_state = 0; |
0b224527 RW |
219 | list_for_each_entry(entry, list, node) { |
220 | struct acpi_power_resource *resource = entry->resource; | |
221 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
222 | int result; |
223 | ||
d0515d9f | 224 | mutex_lock(&resource->resource_lock); |
d0515d9f | 225 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 226 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
227 | if (result) |
228 | return result; | |
229 | ||
230 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
231 | break; |
232 | } | |
233 | ||
234 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 235 | cur_state ? "on" : "off")); |
1da177e4 | 236 | |
d0515d9f | 237 | *state = cur_state; |
d0515d9f | 238 | return 0; |
1da177e4 LT |
239 | } |
240 | ||
4533771c MW |
241 | static int |
242 | acpi_power_resource_add_dependent(struct acpi_power_resource *resource, | |
243 | struct device *dev) | |
244 | { | |
245 | struct acpi_power_dependent_device *dep; | |
246 | int ret = 0; | |
247 | ||
248 | mutex_lock(&resource->resource_lock); | |
249 | list_for_each_entry(dep, &resource->dependents, node) { | |
250 | /* Only add it once */ | |
251 | if (dep->dev == dev) | |
252 | goto unlock; | |
253 | } | |
254 | ||
255 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); | |
256 | if (!dep) { | |
257 | ret = -ENOMEM; | |
258 | goto unlock; | |
259 | } | |
260 | ||
261 | dep->dev = dev; | |
262 | list_add_tail(&dep->node, &resource->dependents); | |
263 | dev_dbg(dev, "added power dependency to [%s]\n", resource->name); | |
264 | ||
265 | unlock: | |
266 | mutex_unlock(&resource->resource_lock); | |
267 | return ret; | |
268 | } | |
269 | ||
270 | static void | |
271 | acpi_power_resource_remove_dependent(struct acpi_power_resource *resource, | |
272 | struct device *dev) | |
273 | { | |
274 | struct acpi_power_dependent_device *dep; | |
275 | ||
276 | mutex_lock(&resource->resource_lock); | |
277 | list_for_each_entry(dep, &resource->dependents, node) { | |
278 | if (dep->dev == dev) { | |
279 | list_del(&dep->node); | |
280 | kfree(dep); | |
281 | dev_dbg(dev, "removed power dependency to [%s]\n", | |
282 | resource->name); | |
283 | break; | |
284 | } | |
285 | } | |
286 | mutex_unlock(&resource->resource_lock); | |
287 | } | |
288 | ||
289 | /** | |
290 | * acpi_device_power_add_dependent - Add dependent device of this ACPI device | |
291 | * @adev: ACPI device pointer | |
292 | * @dev: Dependent device | |
293 | * | |
294 | * If @adev has non-empty _PR0 the @dev is added as dependent device to all | |
295 | * power resources returned by it. This means that whenever these power | |
296 | * resources are turned _ON the dependent devices get runtime resumed. This | |
297 | * is needed for devices such as PCI to allow its driver to re-initialize | |
298 | * it after it went to D0uninitialized. | |
299 | * | |
300 | * If @adev does not have _PR0 this does nothing. | |
301 | * | |
302 | * Returns %0 in case of success and negative errno otherwise. | |
303 | */ | |
304 | int acpi_device_power_add_dependent(struct acpi_device *adev, | |
305 | struct device *dev) | |
306 | { | |
307 | struct acpi_power_resource_entry *entry; | |
308 | struct list_head *resources; | |
309 | int ret; | |
310 | ||
311 | if (!adev->flags.power_manageable) | |
312 | return 0; | |
313 | ||
314 | resources = &adev->power.states[ACPI_STATE_D0].resources; | |
315 | list_for_each_entry(entry, resources, node) { | |
316 | ret = acpi_power_resource_add_dependent(entry->resource, dev); | |
317 | if (ret) | |
318 | goto err; | |
319 | } | |
320 | ||
321 | return 0; | |
322 | ||
323 | err: | |
324 | list_for_each_entry(entry, resources, node) | |
325 | acpi_power_resource_remove_dependent(entry->resource, dev); | |
326 | ||
327 | return ret; | |
328 | } | |
329 | ||
330 | /** | |
331 | * acpi_device_power_remove_dependent - Remove dependent device | |
332 | * @adev: ACPI device pointer | |
333 | * @dev: Dependent device | |
334 | * | |
335 | * Does the opposite of acpi_device_power_add_dependent() and removes the | |
336 | * dependent device if it is found. Can be called to @adev that does not | |
337 | * have _PR0 as well. | |
338 | */ | |
339 | void acpi_device_power_remove_dependent(struct acpi_device *adev, | |
340 | struct device *dev) | |
341 | { | |
342 | struct acpi_power_resource_entry *entry; | |
343 | struct list_head *resources; | |
344 | ||
345 | if (!adev->flags.power_manageable) | |
346 | return; | |
347 | ||
348 | resources = &adev->power.states[ACPI_STATE_D0].resources; | |
349 | list_for_each_entry_reverse(entry, resources, node) | |
350 | acpi_power_resource_remove_dependent(entry->resource, dev); | |
351 | } | |
352 | ||
3e384ee6 | 353 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 354 | { |
4533771c | 355 | struct acpi_power_dependent_device *dep; |
4be44fcd | 356 | acpi_status status = AE_OK; |
1da177e4 | 357 | |
82c7d5ef | 358 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
359 | if (ACPI_FAILURE(status)) |
360 | return -ENODEV; | |
361 | ||
3e384ee6 RW |
362 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
363 | resource->name)); | |
364 | ||
4533771c MW |
365 | /* |
366 | * If there are other dependents on this power resource we need to | |
367 | * resume them now so that their drivers can re-initialize the | |
368 | * hardware properly after it went back to D0. | |
369 | */ | |
370 | if (list_empty(&resource->dependents) || | |
371 | list_is_singular(&resource->dependents)) | |
372 | return 0; | |
373 | ||
374 | list_for_each_entry(dep, &resource->dependents, node) { | |
375 | dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n", | |
376 | resource->name); | |
377 | pm_request_resume(dep->dev); | |
378 | } | |
379 | ||
3e384ee6 RW |
380 | return 0; |
381 | } | |
382 | ||
b5d667eb | 383 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 384 | { |
b5d667eb | 385 | int result = 0; |
0a613902 | 386 | |
3e384ee6 RW |
387 | if (resource->ref_count++) { |
388 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 389 | "Power resource [%s] already on\n", |
3e384ee6 RW |
390 | resource->name)); |
391 | } else { | |
392 | result = __acpi_power_on(resource); | |
41863fce | 393 | if (result) |
12b3b5af | 394 | resource->ref_count--; |
40bf66ec | 395 | } |
b5d667eb RW |
396 | return result; |
397 | } | |
40bf66ec | 398 | |
b5d667eb RW |
399 | static int acpi_power_on(struct acpi_power_resource *resource) |
400 | { | |
401 | int result; | |
40bf66ec | 402 | |
b5d667eb RW |
403 | mutex_lock(&resource->resource_lock); |
404 | result = acpi_power_on_unlocked(resource); | |
405 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 406 | return result; |
1da177e4 LT |
407 | } |
408 | ||
660b1113 RW |
409 | static int __acpi_power_off(struct acpi_power_resource *resource) |
410 | { | |
411 | acpi_status status; | |
412 | ||
413 | status = acpi_evaluate_object(resource->device.handle, "_OFF", | |
414 | NULL, NULL); | |
415 | if (ACPI_FAILURE(status)) | |
416 | return -ENODEV; | |
417 | ||
418 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n", | |
419 | resource->name)); | |
420 | return 0; | |
421 | } | |
422 | ||
b5d667eb | 423 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 424 | { |
0b224527 | 425 | int result = 0; |
1da177e4 | 426 | |
3e384ee6 RW |
427 | if (!resource->ref_count) { |
428 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 429 | "Power resource [%s] already off\n", |
3e384ee6 | 430 | resource->name)); |
b5d667eb | 431 | return 0; |
0a613902 | 432 | } |
1da177e4 | 433 | |
3e384ee6 RW |
434 | if (--resource->ref_count) { |
435 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
436 | "Power resource [%s] still in use\n", | |
437 | resource->name)); | |
660b1113 RW |
438 | } else { |
439 | result = __acpi_power_off(resource); | |
440 | if (result) | |
441 | resource->ref_count++; | |
1da177e4 | 442 | } |
b5d667eb RW |
443 | return result; |
444 | } | |
1da177e4 | 445 | |
b5d667eb RW |
446 | static int acpi_power_off(struct acpi_power_resource *resource) |
447 | { | |
448 | int result; | |
1da177e4 | 449 | |
b5d667eb RW |
450 | mutex_lock(&resource->resource_lock); |
451 | result = acpi_power_off_unlocked(resource); | |
452 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 453 | return result; |
1da177e4 LT |
454 | } |
455 | ||
0b224527 | 456 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 457 | { |
0b224527 RW |
458 | struct acpi_power_resource_entry *entry; |
459 | int result = 0; | |
d2ef555b | 460 | |
0b224527 RW |
461 | list_for_each_entry_reverse(entry, list, node) { |
462 | result = acpi_power_off(entry->resource); | |
463 | if (result) | |
464 | goto err; | |
465 | } | |
466 | return 0; | |
d2ef555b | 467 | |
0b224527 RW |
468 | err: |
469 | list_for_each_entry_continue(entry, list, node) | |
470 | acpi_power_on(entry->resource); | |
471 | ||
472 | return result; | |
d2ef555b RW |
473 | } |
474 | ||
0b224527 | 475 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 476 | { |
0b224527 | 477 | struct acpi_power_resource_entry *entry; |
d2ef555b | 478 | int result = 0; |
d2ef555b | 479 | |
0b224527 RW |
480 | list_for_each_entry(entry, list, node) { |
481 | result = acpi_power_on(entry->resource); | |
482 | if (result) | |
483 | goto err; | |
d2ef555b | 484 | } |
0b224527 RW |
485 | return 0; |
486 | ||
487 | err: | |
488 | list_for_each_entry_continue_reverse(entry, list, node) | |
489 | acpi_power_off(entry->resource); | |
d2ef555b RW |
490 | |
491 | return result; | |
492 | } | |
493 | ||
18a38709 RW |
494 | static struct attribute *attrs[] = { |
495 | NULL, | |
496 | }; | |
497 | ||
26408b24 | 498 | static const struct attribute_group attr_groups[] = { |
18a38709 RW |
499 | [ACPI_STATE_D0] = { |
500 | .name = "power_resources_D0", | |
501 | .attrs = attrs, | |
502 | }, | |
503 | [ACPI_STATE_D1] = { | |
504 | .name = "power_resources_D1", | |
505 | .attrs = attrs, | |
506 | }, | |
507 | [ACPI_STATE_D2] = { | |
508 | .name = "power_resources_D2", | |
509 | .attrs = attrs, | |
510 | }, | |
511 | [ACPI_STATE_D3_HOT] = { | |
512 | .name = "power_resources_D3hot", | |
513 | .attrs = attrs, | |
514 | }, | |
515 | }; | |
516 | ||
26408b24 | 517 | static const struct attribute_group wakeup_attr_group = { |
41a2a466 RW |
518 | .name = "power_resources_wakeup", |
519 | .attrs = attrs, | |
520 | }; | |
521 | ||
522 | static void acpi_power_hide_list(struct acpi_device *adev, | |
523 | struct list_head *resources, | |
26408b24 | 524 | const struct attribute_group *attr_group) |
18a38709 | 525 | { |
18a38709 RW |
526 | struct acpi_power_resource_entry *entry; |
527 | ||
41a2a466 | 528 | if (list_empty(resources)) |
18a38709 RW |
529 | return; |
530 | ||
41a2a466 | 531 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
532 | struct acpi_device *res_dev = &entry->resource->device; |
533 | ||
534 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 535 | attr_group->name, |
18a38709 RW |
536 | dev_name(&res_dev->dev)); |
537 | } | |
41a2a466 | 538 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
539 | } |
540 | ||
41a2a466 RW |
541 | static void acpi_power_expose_list(struct acpi_device *adev, |
542 | struct list_head *resources, | |
26408b24 | 543 | const struct attribute_group *attr_group) |
0090def6 | 544 | { |
18a38709 RW |
545 | struct acpi_power_resource_entry *entry; |
546 | int ret; | |
547 | ||
41a2a466 | 548 | if (list_empty(resources)) |
18a38709 RW |
549 | return; |
550 | ||
41a2a466 | 551 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
552 | if (ret) |
553 | return; | |
554 | ||
41a2a466 | 555 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
556 | struct acpi_device *res_dev = &entry->resource->device; |
557 | ||
558 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 559 | attr_group->name, |
18a38709 RW |
560 | &res_dev->dev.kobj, |
561 | dev_name(&res_dev->dev)); | |
562 | if (ret) { | |
41a2a466 | 563 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 564 | break; |
0090def6 LM |
565 | } |
566 | } | |
0090def6 | 567 | } |
bc9b6407 | 568 | |
41a2a466 RW |
569 | static void acpi_power_expose_hide(struct acpi_device *adev, |
570 | struct list_head *resources, | |
26408b24 | 571 | const struct attribute_group *attr_group, |
41a2a466 RW |
572 | bool expose) |
573 | { | |
574 | if (expose) | |
575 | acpi_power_expose_list(adev, resources, attr_group); | |
576 | else | |
577 | acpi_power_hide_list(adev, resources, attr_group); | |
578 | } | |
579 | ||
18a38709 RW |
580 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
581 | { | |
18a38709 RW |
582 | int state; |
583 | ||
41a2a466 RW |
584 | if (adev->wakeup.flags.valid) |
585 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
586 | &wakeup_attr_group, add); | |
587 | ||
18a38709 RW |
588 | if (!adev->power.flags.power_resources) |
589 | return; | |
590 | ||
41a2a466 RW |
591 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
592 | acpi_power_expose_hide(adev, | |
593 | &adev->power.states[state].resources, | |
594 | &attr_groups[state], add); | |
18a38709 RW |
595 | } |
596 | ||
b5d667eb | 597 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
598 | { |
599 | struct acpi_power_resource_entry *entry; | |
600 | int system_level = 5; | |
601 | ||
602 | list_for_each_entry(entry, list, node) { | |
603 | struct acpi_power_resource *resource = entry->resource; | |
b5d667eb RW |
604 | acpi_handle handle = resource->device.handle; |
605 | int result; | |
606 | int state; | |
0596a52b | 607 | |
b5d667eb RW |
608 | mutex_lock(&resource->resource_lock); |
609 | ||
610 | result = acpi_power_get_state(handle, &state); | |
611 | if (result) { | |
612 | mutex_unlock(&resource->resource_lock); | |
613 | return result; | |
614 | } | |
615 | if (state == ACPI_POWER_RESOURCE_STATE_ON) { | |
616 | resource->ref_count++; | |
617 | resource->wakeup_enabled = true; | |
618 | } | |
0596a52b RW |
619 | if (system_level > resource->system_level) |
620 | system_level = resource->system_level; | |
b5d667eb RW |
621 | |
622 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 623 | } |
b5d667eb RW |
624 | *system_level_p = system_level; |
625 | return 0; | |
0596a52b RW |
626 | } |
627 | ||
bc9b6407 RW |
628 | /* -------------------------------------------------------------------------- |
629 | Device Power Management | |
630 | -------------------------------------------------------------------------- */ | |
0090def6 | 631 | |
77e76609 RW |
632 | /** |
633 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
634 | * ACPI 3.0) _PSW (Power State Wake) | |
635 | * @dev: Device to handle. | |
636 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
637 | * @sleep_state: Target sleep state of the system. | |
638 | * @dev_state: Target power state of the device. | |
639 | * | |
640 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
641 | * State Wake) for the device, if present. On failure reset the device's | |
642 | * wakeup.flags.valid flag. | |
643 | * | |
644 | * RETURN VALUE: | |
645 | * 0 if either _DSW or _PSW has been successfully executed | |
646 | * 0 if neither _DSW nor _PSW has been found | |
647 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
648 | */ | |
649 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
650 | int enable, int sleep_state, int dev_state) | |
651 | { | |
652 | union acpi_object in_arg[3]; | |
653 | struct acpi_object_list arg_list = { 3, in_arg }; | |
654 | acpi_status status = AE_OK; | |
655 | ||
656 | /* | |
657 | * Try to execute _DSW first. | |
658 | * | |
603fadf3 | 659 | * Three arguments are needed for the _DSW object: |
77e76609 RW |
660 | * Argument 0: enable/disable the wake capabilities |
661 | * Argument 1: target system state | |
662 | * Argument 2: target device state | |
663 | * When _DSW object is called to disable the wake capabilities, maybe | |
603fadf3 | 664 | * the first argument is filled. The values of the other two arguments |
77e76609 RW |
665 | * are meaningless. |
666 | */ | |
667 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
668 | in_arg[0].integer.value = enable; | |
669 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
670 | in_arg[1].integer.value = sleep_state; | |
671 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
672 | in_arg[2].integer.value = dev_state; | |
673 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
674 | if (ACPI_SUCCESS(status)) { | |
675 | return 0; | |
676 | } else if (status != AE_NOT_FOUND) { | |
677 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
678 | dev->wakeup.flags.valid = 0; | |
679 | return -ENODEV; | |
680 | } | |
681 | ||
682 | /* Execute _PSW */ | |
0db98202 | 683 | status = acpi_execute_simple_method(dev->handle, "_PSW", enable); |
77e76609 RW |
684 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
685 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
686 | dev->wakeup.flags.valid = 0; | |
687 | return -ENODEV; | |
688 | } | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
1da177e4 LT |
693 | /* |
694 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
695 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
696 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
697 | * State Wake) for the device, if present | |
1da177e4 | 698 | */ |
77e76609 | 699 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 700 | { |
b5d667eb | 701 | struct acpi_power_resource_entry *entry; |
993cbe59 | 702 | int err = 0; |
1da177e4 | 703 | |
1da177e4 | 704 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 705 | return -EINVAL; |
1da177e4 | 706 | |
9b83ccd2 RW |
707 | mutex_lock(&acpi_device_lock); |
708 | ||
709 | if (dev->wakeup.prepare_count++) | |
710 | goto out; | |
0af4b8c4 | 711 | |
b5d667eb RW |
712 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
713 | struct acpi_power_resource *resource = entry->resource; | |
714 | ||
715 | mutex_lock(&resource->resource_lock); | |
716 | ||
717 | if (!resource->wakeup_enabled) { | |
718 | err = acpi_power_on_unlocked(resource); | |
719 | if (!err) | |
720 | resource->wakeup_enabled = true; | |
721 | } | |
722 | ||
723 | mutex_unlock(&resource->resource_lock); | |
724 | ||
725 | if (err) { | |
726 | dev_err(&dev->dev, | |
727 | "Cannot turn wakeup power resources on\n"); | |
728 | dev->wakeup.flags.valid = 0; | |
729 | goto out; | |
730 | } | |
1da177e4 | 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); | |
9b83ccd2 RW |
737 | if (err) |
738 | dev->wakeup.prepare_count = 0; | |
739 | ||
740 | out: | |
741 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 742 | return err; |
1da177e4 LT |
743 | } |
744 | ||
745 | /* | |
746 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
747 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
748 | * State Wake) for the device, if present | |
1da177e4 LT |
749 | * 2. Shutdown down the power resources |
750 | */ | |
4be44fcd | 751 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 752 | { |
b5d667eb | 753 | struct acpi_power_resource_entry *entry; |
993cbe59 | 754 | int err = 0; |
1da177e4 LT |
755 | |
756 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 757 | return -EINVAL; |
1da177e4 | 758 | |
9b83ccd2 RW |
759 | mutex_lock(&acpi_device_lock); |
760 | ||
761 | if (--dev->wakeup.prepare_count > 0) | |
762 | goto out; | |
763 | ||
0af4b8c4 | 764 | /* |
9b83ccd2 RW |
765 | * Executing the code below even if prepare_count is already zero when |
766 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 767 | */ |
9b83ccd2 RW |
768 | if (dev->wakeup.prepare_count < 0) |
769 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 770 | |
9b83ccd2 RW |
771 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
772 | if (err) | |
773 | goto out; | |
1da177e4 | 774 | |
b5d667eb RW |
775 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
776 | struct acpi_power_resource *resource = entry->resource; | |
777 | ||
778 | mutex_lock(&resource->resource_lock); | |
779 | ||
780 | if (resource->wakeup_enabled) { | |
781 | err = acpi_power_off_unlocked(resource); | |
782 | if (!err) | |
783 | resource->wakeup_enabled = false; | |
784 | } | |
785 | ||
786 | mutex_unlock(&resource->resource_lock); | |
787 | ||
788 | if (err) { | |
789 | dev_err(&dev->dev, | |
790 | "Cannot turn wakeup power resources off\n"); | |
791 | dev->wakeup.flags.valid = 0; | |
792 | break; | |
793 | } | |
1da177e4 LT |
794 | } |
795 | ||
9b83ccd2 RW |
796 | out: |
797 | mutex_unlock(&acpi_device_lock); | |
798 | return err; | |
1da177e4 LT |
799 | } |
800 | ||
32a00d27 | 801 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 802 | { |
4be44fcd | 803 | int result = 0; |
4be44fcd LB |
804 | int list_state = 0; |
805 | int i = 0; | |
1da177e4 | 806 | |
32a00d27 | 807 | if (!device || !state) |
d550d98d | 808 | return -EINVAL; |
1da177e4 | 809 | |
1da177e4 LT |
810 | /* |
811 | * We know a device's inferred power state when all the resources | |
812 | * required for a given D-state are 'on'. | |
813 | */ | |
38c92fff | 814 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
815 | struct list_head *list = &device->power.states[i].resources; |
816 | ||
817 | if (list_empty(list)) | |
1da177e4 LT |
818 | continue; |
819 | ||
820 | result = acpi_power_get_list_state(list, &list_state); | |
821 | if (result) | |
d550d98d | 822 | return result; |
1da177e4 LT |
823 | |
824 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 825 | *state = i; |
d550d98d | 826 | return 0; |
1da177e4 LT |
827 | } |
828 | } | |
829 | ||
20dacb71 RW |
830 | *state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ? |
831 | ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT; | |
d550d98d | 832 | return 0; |
1da177e4 LT |
833 | } |
834 | ||
30d3df41 RW |
835 | int acpi_power_on_resources(struct acpi_device *device, int state) |
836 | { | |
87e753b0 | 837 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
838 | return -EINVAL; |
839 | ||
840 | return acpi_power_on_list(&device->power.states[state].resources); | |
841 | } | |
842 | ||
4be44fcd | 843 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 844 | { |
5c7dd710 | 845 | int result = 0; |
1da177e4 | 846 | |
3ebc81b8 | 847 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 848 | return -EINVAL; |
1da177e4 | 849 | |
0b224527 | 850 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
851 | return 0; |
852 | ||
4be44fcd | 853 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 854 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 855 | return -ENODEV; |
1da177e4 | 856 | |
1da177e4 LT |
857 | /* |
858 | * First we reference all power resources required in the target list | |
d2ef555b RW |
859 | * (e.g. so the device doesn't lose power while transitioning). Then, |
860 | * we dereference all power resources used in the current list. | |
1da177e4 | 861 | */ |
5c7dd710 RW |
862 | if (state < ACPI_STATE_D3_COLD) |
863 | result = acpi_power_on_list( | |
864 | &device->power.states[state].resources); | |
865 | ||
866 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
867 | acpi_power_off_list( |
868 | &device->power.states[device->power.state].resources); | |
1da177e4 | 869 | |
d2ef555b RW |
870 | /* We shouldn't change the state unless the above operations succeed. */ |
871 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 872 | |
d550d98d | 873 | return result; |
1da177e4 LT |
874 | } |
875 | ||
82c7d5ef RW |
876 | static void acpi_release_power_resource(struct device *dev) |
877 | { | |
878 | struct acpi_device *device = to_acpi_device(dev); | |
879 | struct acpi_power_resource *resource; | |
880 | ||
82c7d5ef | 881 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
882 | |
883 | mutex_lock(&power_resource_list_lock); | |
884 | list_del(&resource->list_node); | |
885 | mutex_unlock(&power_resource_list_lock); | |
886 | ||
c0af4175 | 887 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
888 | kfree(resource); |
889 | } | |
1da177e4 | 890 | |
b1c0f99b RW |
891 | static ssize_t acpi_power_in_use_show(struct device *dev, |
892 | struct device_attribute *attr, | |
893 | char *buf) { | |
894 | struct acpi_power_resource *resource; | |
895 | ||
896 | resource = to_power_resource(to_acpi_device(dev)); | |
897 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
898 | } | |
899 | static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL); | |
900 | ||
901 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
902 | { | |
903 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
904 | } | |
905 | ||
d5eefa82 RW |
906 | static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource) |
907 | { | |
908 | mutex_lock(&power_resource_list_lock); | |
909 | ||
910 | if (!list_empty(&acpi_power_resource_list)) { | |
911 | struct acpi_power_resource *r; | |
912 | ||
913 | list_for_each_entry(r, &acpi_power_resource_list, list_node) | |
914 | if (r->order > resource->order) { | |
915 | list_add_tail(&resource->list_node, &r->list_node); | |
916 | goto out; | |
917 | } | |
918 | } | |
919 | list_add_tail(&resource->list_node, &acpi_power_resource_list); | |
920 | ||
921 | out: | |
922 | mutex_unlock(&power_resource_list_lock); | |
923 | } | |
924 | ||
e88c9c60 | 925 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 926 | { |
82c7d5ef RW |
927 | struct acpi_power_resource *resource; |
928 | struct acpi_device *device = NULL; | |
4be44fcd LB |
929 | union acpi_object acpi_object; |
930 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
931 | acpi_status status; |
932 | int state, result = -ENODEV; | |
1da177e4 | 933 | |
82c7d5ef RW |
934 | acpi_bus_get_device(handle, &device); |
935 | if (device) | |
e88c9c60 | 936 | return 0; |
1da177e4 | 937 | |
82c7d5ef | 938 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 939 | if (!resource) |
e88c9c60 | 940 | return -ENOMEM; |
1da177e4 | 941 | |
82c7d5ef RW |
942 | device = &resource->device; |
943 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
944 | ACPI_STA_DEFAULT); | |
0a613902 | 945 | mutex_init(&resource->resource_lock); |
6ee22e9d | 946 | INIT_LIST_HEAD(&resource->list_node); |
4533771c | 947 | INIT_LIST_HEAD(&resource->dependents); |
82c7d5ef | 948 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
949 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
950 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 951 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
952 | |
953 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
954 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
955 | if (ACPI_FAILURE(status)) | |
781d737c | 956 | goto err; |
82c7d5ef | 957 | |
1da177e4 LT |
958 | resource->system_level = acpi_object.power_resource.system_level; |
959 | resource->order = acpi_object.power_resource.resource_order; | |
960 | ||
82c7d5ef | 961 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 962 | if (result) |
781d737c | 963 | goto err; |
1da177e4 | 964 | |
1da177e4 | 965 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 966 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 967 | |
82c7d5ef | 968 | device->flags.match_driver = true; |
cf860be6 | 969 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 970 | if (result) |
781d737c | 971 | goto err; |
4be44fcd | 972 | |
b1c0f99b RW |
973 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
974 | device->remove = acpi_power_sysfs_remove; | |
975 | ||
d5eefa82 | 976 | acpi_power_add_resource_to_list(resource); |
cf860be6 | 977 | acpi_device_add_finalize(device); |
e88c9c60 | 978 | return 0; |
1da177e4 | 979 | |
781d737c RW |
980 | err: |
981 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 982 | return result; |
781d737c | 983 | } |
1da177e4 | 984 | |
781d737c RW |
985 | #ifdef CONFIG_ACPI_SLEEP |
986 | void acpi_resume_power_resources(void) | |
0a613902 | 987 | { |
3e384ee6 | 988 | struct acpi_power_resource *resource; |
0a613902 | 989 | |
781d737c | 990 | mutex_lock(&power_resource_list_lock); |
0a613902 | 991 | |
781d737c RW |
992 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
993 | int result, state; | |
0a613902 | 994 | |
781d737c | 995 | mutex_lock(&resource->resource_lock); |
0a613902 | 996 | |
781d737c | 997 | result = acpi_power_get_state(resource->device.handle, &state); |
d7d49012 LT |
998 | if (result) { |
999 | mutex_unlock(&resource->resource_lock); | |
660b1113 | 1000 | continue; |
d7d49012 | 1001 | } |
660b1113 RW |
1002 | |
1003 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c RW |
1004 | && resource->ref_count) { |
1005 | dev_info(&resource->device.dev, "Turning ON\n"); | |
1006 | __acpi_power_on(resource); | |
d5eefa82 RW |
1007 | } |
1008 | ||
1009 | mutex_unlock(&resource->resource_lock); | |
1010 | } | |
8ece1d83 HG |
1011 | |
1012 | mutex_unlock(&power_resource_list_lock); | |
1013 | } | |
1014 | ||
1015 | void acpi_turn_off_unused_power_resources(void) | |
1016 | { | |
1017 | struct acpi_power_resource *resource; | |
1018 | ||
1019 | mutex_lock(&power_resource_list_lock); | |
1020 | ||
d5eefa82 RW |
1021 | list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) { |
1022 | int result, state; | |
1023 | ||
1024 | mutex_lock(&resource->resource_lock); | |
1025 | ||
1026 | result = acpi_power_get_state(resource->device.handle, &state); | |
1027 | if (result) { | |
1028 | mutex_unlock(&resource->resource_lock); | |
1029 | continue; | |
1030 | } | |
1031 | ||
1032 | if (state == ACPI_POWER_RESOURCE_STATE_ON | |
660b1113 RW |
1033 | && !resource->ref_count) { |
1034 | dev_info(&resource->device.dev, "Turning OFF\n"); | |
1035 | __acpi_power_off(resource); | |
781d737c | 1036 | } |
0a613902 | 1037 | |
781d737c RW |
1038 | mutex_unlock(&resource->resource_lock); |
1039 | } | |
3e384ee6 | 1040 | |
781d737c | 1041 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 1042 | } |
90692404 | 1043 | #endif |