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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 | ||
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 | 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; |
82c7d5ef | 51 | char *name; |
4be44fcd LB |
52 | u32 system_level; |
53 | u32 order; | |
3e384ee6 | 54 | unsigned int ref_count; |
b5d667eb | 55 | bool wakeup_enabled; |
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 | ||
b1c0f99b RW |
72 | static inline |
73 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
74 | { | |
75 | return container_of(device, struct acpi_power_resource, device); | |
76 | } | |
77 | ||
82c7d5ef | 78 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 79 | { |
82c7d5ef | 80 | struct acpi_device *device; |
1da177e4 | 81 | |
82c7d5ef RW |
82 | if (acpi_bus_get_device(handle, &device)) |
83 | return NULL; | |
1da177e4 | 84 | |
b1c0f99b | 85 | return to_power_resource(device); |
1da177e4 LT |
86 | } |
87 | ||
e88c9c60 RW |
88 | static int acpi_power_resources_list_add(acpi_handle handle, |
89 | struct list_head *list) | |
0b224527 RW |
90 | { |
91 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
92 | struct acpi_power_resource_entry *entry; | |
93 | ||
94 | if (!resource || !list) | |
e88c9c60 | 95 | return -EINVAL; |
0b224527 RW |
96 | |
97 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
98 | if (!entry) | |
e88c9c60 | 99 | return -ENOMEM; |
0b224527 RW |
100 | |
101 | entry->resource = resource; | |
102 | if (!list_empty(list)) { | |
103 | struct acpi_power_resource_entry *e; | |
104 | ||
105 | list_for_each_entry(e, list, node) | |
106 | if (e->resource->order > resource->order) { | |
107 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 108 | return 0; |
0b224527 RW |
109 | } |
110 | } | |
111 | list_add_tail(&entry->node, list); | |
e88c9c60 | 112 | return 0; |
0b224527 RW |
113 | } |
114 | ||
115 | void acpi_power_resources_list_free(struct list_head *list) | |
116 | { | |
117 | struct acpi_power_resource_entry *entry, *e; | |
118 | ||
119 | list_for_each_entry_safe(entry, e, list, node) { | |
120 | list_del(&entry->node); | |
121 | kfree(entry); | |
122 | } | |
123 | } | |
124 | ||
7d7b467c HG |
125 | static bool acpi_power_resource_is_dup(union acpi_object *package, |
126 | unsigned int start, unsigned int i) | |
127 | { | |
128 | acpi_handle rhandle, dup; | |
129 | unsigned int j; | |
130 | ||
131 | /* The caller is expected to check the package element types */ | |
132 | rhandle = package->package.elements[i].reference.handle; | |
133 | for (j = start; j < i; j++) { | |
134 | dup = package->package.elements[j].reference.handle; | |
135 | if (dup == rhandle) | |
136 | return true; | |
137 | } | |
138 | ||
139 | return false; | |
140 | } | |
141 | ||
e88c9c60 RW |
142 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
143 | struct list_head *list) | |
ef85bdbe | 144 | { |
ef85bdbe | 145 | unsigned int i; |
e88c9c60 | 146 | int err = 0; |
ef85bdbe RW |
147 | |
148 | for (i = start; i < package->package.count; i++) { | |
149 | union acpi_object *element = &package->package.elements[i]; | |
150 | acpi_handle rhandle; | |
151 | ||
152 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 153 | err = -ENODATA; |
ef85bdbe RW |
154 | break; |
155 | } | |
156 | rhandle = element->reference.handle; | |
157 | if (!rhandle) { | |
e88c9c60 | 158 | err = -ENODEV; |
ef85bdbe RW |
159 | break; |
160 | } | |
7d7b467c HG |
161 | |
162 | /* Some ACPI tables contain duplicate power resource references */ | |
163 | if (acpi_power_resource_is_dup(package, start, i)) | |
164 | continue; | |
165 | ||
e88c9c60 RW |
166 | err = acpi_add_power_resource(rhandle); |
167 | if (err) | |
168 | break; | |
169 | ||
170 | err = acpi_power_resources_list_add(rhandle, list); | |
171 | if (err) | |
172 | break; | |
ef85bdbe | 173 | } |
e88c9c60 | 174 | if (err) |
ef85bdbe RW |
175 | acpi_power_resources_list_free(list); |
176 | ||
e88c9c60 | 177 | return err; |
ef85bdbe RW |
178 | } |
179 | ||
a51e145f | 180 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 181 | { |
4be44fcd | 182 | acpi_status status = AE_OK; |
27663c58 | 183 | unsigned long long sta = 0; |
60a4ce7f LM |
184 | char node_name[5]; |
185 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 186 | |
1da177e4 | 187 | |
a51e145f | 188 | if (!handle || !state) |
d550d98d | 189 | return -EINVAL; |
1da177e4 | 190 | |
a51e145f | 191 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 192 | if (ACPI_FAILURE(status)) |
d550d98d | 193 | return -ENODEV; |
1da177e4 | 194 | |
c35923bc AS |
195 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
196 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 197 | |
60a4ce7f LM |
198 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
199 | ||
1da177e4 | 200 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 201 | node_name, |
b1b57fbe | 202 | *state ? "on" : "off")); |
1da177e4 | 203 | |
d550d98d | 204 | return 0; |
1da177e4 LT |
205 | } |
206 | ||
0b224527 | 207 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 208 | { |
0b224527 | 209 | struct acpi_power_resource_entry *entry; |
d0515d9f | 210 | int cur_state; |
1da177e4 LT |
211 | |
212 | if (!list || !state) | |
d550d98d | 213 | return -EINVAL; |
1da177e4 LT |
214 | |
215 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
fe8c470a | 216 | cur_state = 0; |
0b224527 RW |
217 | list_for_each_entry(entry, list, node) { |
218 | struct acpi_power_resource *resource = entry->resource; | |
219 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
220 | int result; |
221 | ||
d0515d9f | 222 | mutex_lock(&resource->resource_lock); |
d0515d9f | 223 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 224 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
225 | if (result) |
226 | return result; | |
227 | ||
228 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
229 | break; |
230 | } | |
231 | ||
232 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 233 | cur_state ? "on" : "off")); |
1da177e4 | 234 | |
d0515d9f | 235 | *state = cur_state; |
d0515d9f | 236 | return 0; |
1da177e4 LT |
237 | } |
238 | ||
4533771c MW |
239 | static int |
240 | acpi_power_resource_add_dependent(struct acpi_power_resource *resource, | |
241 | struct device *dev) | |
242 | { | |
243 | struct acpi_power_dependent_device *dep; | |
244 | int ret = 0; | |
245 | ||
246 | mutex_lock(&resource->resource_lock); | |
247 | list_for_each_entry(dep, &resource->dependents, node) { | |
248 | /* Only add it once */ | |
249 | if (dep->dev == dev) | |
250 | goto unlock; | |
251 | } | |
252 | ||
253 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); | |
254 | if (!dep) { | |
255 | ret = -ENOMEM; | |
256 | goto unlock; | |
257 | } | |
258 | ||
259 | dep->dev = dev; | |
260 | list_add_tail(&dep->node, &resource->dependents); | |
261 | dev_dbg(dev, "added power dependency to [%s]\n", resource->name); | |
262 | ||
263 | unlock: | |
264 | mutex_unlock(&resource->resource_lock); | |
265 | return ret; | |
266 | } | |
267 | ||
268 | static void | |
269 | acpi_power_resource_remove_dependent(struct acpi_power_resource *resource, | |
270 | struct device *dev) | |
271 | { | |
272 | struct acpi_power_dependent_device *dep; | |
273 | ||
274 | mutex_lock(&resource->resource_lock); | |
275 | list_for_each_entry(dep, &resource->dependents, node) { | |
276 | if (dep->dev == dev) { | |
277 | list_del(&dep->node); | |
278 | kfree(dep); | |
279 | dev_dbg(dev, "removed power dependency to [%s]\n", | |
280 | resource->name); | |
281 | break; | |
282 | } | |
283 | } | |
284 | mutex_unlock(&resource->resource_lock); | |
285 | } | |
286 | ||
287 | /** | |
288 | * acpi_device_power_add_dependent - Add dependent device of this ACPI device | |
289 | * @adev: ACPI device pointer | |
290 | * @dev: Dependent device | |
291 | * | |
292 | * If @adev has non-empty _PR0 the @dev is added as dependent device to all | |
293 | * power resources returned by it. This means that whenever these power | |
294 | * resources are turned _ON the dependent devices get runtime resumed. This | |
295 | * is needed for devices such as PCI to allow its driver to re-initialize | |
296 | * it after it went to D0uninitialized. | |
297 | * | |
298 | * If @adev does not have _PR0 this does nothing. | |
299 | * | |
300 | * Returns %0 in case of success and negative errno otherwise. | |
301 | */ | |
302 | int acpi_device_power_add_dependent(struct acpi_device *adev, | |
303 | struct device *dev) | |
304 | { | |
305 | struct acpi_power_resource_entry *entry; | |
306 | struct list_head *resources; | |
307 | int ret; | |
308 | ||
309 | if (!adev->flags.power_manageable) | |
310 | return 0; | |
311 | ||
312 | resources = &adev->power.states[ACPI_STATE_D0].resources; | |
313 | list_for_each_entry(entry, resources, node) { | |
314 | ret = acpi_power_resource_add_dependent(entry->resource, dev); | |
315 | if (ret) | |
316 | goto err; | |
317 | } | |
318 | ||
319 | return 0; | |
320 | ||
321 | err: | |
322 | list_for_each_entry(entry, resources, node) | |
323 | acpi_power_resource_remove_dependent(entry->resource, dev); | |
324 | ||
325 | return ret; | |
326 | } | |
327 | ||
328 | /** | |
329 | * acpi_device_power_remove_dependent - Remove dependent device | |
330 | * @adev: ACPI device pointer | |
331 | * @dev: Dependent device | |
332 | * | |
333 | * Does the opposite of acpi_device_power_add_dependent() and removes the | |
334 | * dependent device if it is found. Can be called to @adev that does not | |
335 | * have _PR0 as well. | |
336 | */ | |
337 | void acpi_device_power_remove_dependent(struct acpi_device *adev, | |
338 | struct device *dev) | |
339 | { | |
340 | struct acpi_power_resource_entry *entry; | |
341 | struct list_head *resources; | |
342 | ||
343 | if (!adev->flags.power_manageable) | |
344 | return; | |
345 | ||
346 | resources = &adev->power.states[ACPI_STATE_D0].resources; | |
347 | list_for_each_entry_reverse(entry, resources, node) | |
348 | acpi_power_resource_remove_dependent(entry->resource, dev); | |
349 | } | |
350 | ||
3e384ee6 | 351 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 352 | { |
4533771c | 353 | struct acpi_power_dependent_device *dep; |
4be44fcd | 354 | acpi_status status = AE_OK; |
1da177e4 | 355 | |
82c7d5ef | 356 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
357 | if (ACPI_FAILURE(status)) |
358 | return -ENODEV; | |
359 | ||
3e384ee6 RW |
360 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
361 | resource->name)); | |
362 | ||
4533771c MW |
363 | /* |
364 | * If there are other dependents on this power resource we need to | |
365 | * resume them now so that their drivers can re-initialize the | |
366 | * hardware properly after it went back to D0. | |
367 | */ | |
368 | if (list_empty(&resource->dependents) || | |
369 | list_is_singular(&resource->dependents)) | |
370 | return 0; | |
371 | ||
372 | list_for_each_entry(dep, &resource->dependents, node) { | |
373 | dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n", | |
374 | resource->name); | |
375 | pm_request_resume(dep->dev); | |
376 | } | |
377 | ||
3e384ee6 RW |
378 | return 0; |
379 | } | |
380 | ||
b5d667eb | 381 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 382 | { |
b5d667eb | 383 | int result = 0; |
0a613902 | 384 | |
3e384ee6 RW |
385 | if (resource->ref_count++) { |
386 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 387 | "Power resource [%s] already on\n", |
3e384ee6 RW |
388 | resource->name)); |
389 | } else { | |
390 | result = __acpi_power_on(resource); | |
41863fce | 391 | if (result) |
12b3b5af | 392 | resource->ref_count--; |
40bf66ec | 393 | } |
b5d667eb RW |
394 | return result; |
395 | } | |
40bf66ec | 396 | |
b5d667eb RW |
397 | static int acpi_power_on(struct acpi_power_resource *resource) |
398 | { | |
399 | int result; | |
40bf66ec | 400 | |
b5d667eb RW |
401 | mutex_lock(&resource->resource_lock); |
402 | result = acpi_power_on_unlocked(resource); | |
403 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 404 | return result; |
1da177e4 LT |
405 | } |
406 | ||
660b1113 RW |
407 | static int __acpi_power_off(struct acpi_power_resource *resource) |
408 | { | |
409 | acpi_status status; | |
410 | ||
411 | status = acpi_evaluate_object(resource->device.handle, "_OFF", | |
412 | NULL, NULL); | |
413 | if (ACPI_FAILURE(status)) | |
414 | return -ENODEV; | |
415 | ||
416 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n", | |
417 | resource->name)); | |
418 | return 0; | |
419 | } | |
420 | ||
b5d667eb | 421 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 422 | { |
0b224527 | 423 | int result = 0; |
1da177e4 | 424 | |
3e384ee6 RW |
425 | if (!resource->ref_count) { |
426 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 427 | "Power resource [%s] already off\n", |
3e384ee6 | 428 | resource->name)); |
b5d667eb | 429 | return 0; |
0a613902 | 430 | } |
1da177e4 | 431 | |
3e384ee6 RW |
432 | if (--resource->ref_count) { |
433 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
434 | "Power resource [%s] still in use\n", | |
435 | resource->name)); | |
660b1113 RW |
436 | } else { |
437 | result = __acpi_power_off(resource); | |
438 | if (result) | |
439 | resource->ref_count++; | |
1da177e4 | 440 | } |
b5d667eb RW |
441 | return result; |
442 | } | |
1da177e4 | 443 | |
b5d667eb RW |
444 | static int acpi_power_off(struct acpi_power_resource *resource) |
445 | { | |
446 | int result; | |
1da177e4 | 447 | |
b5d667eb RW |
448 | mutex_lock(&resource->resource_lock); |
449 | result = acpi_power_off_unlocked(resource); | |
450 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 451 | return result; |
1da177e4 LT |
452 | } |
453 | ||
0b224527 | 454 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 455 | { |
0b224527 RW |
456 | struct acpi_power_resource_entry *entry; |
457 | int result = 0; | |
d2ef555b | 458 | |
0b224527 RW |
459 | list_for_each_entry_reverse(entry, list, node) { |
460 | result = acpi_power_off(entry->resource); | |
461 | if (result) | |
462 | goto err; | |
463 | } | |
464 | return 0; | |
d2ef555b | 465 | |
0b224527 RW |
466 | err: |
467 | list_for_each_entry_continue(entry, list, node) | |
468 | acpi_power_on(entry->resource); | |
469 | ||
470 | return result; | |
d2ef555b RW |
471 | } |
472 | ||
0b224527 | 473 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 474 | { |
0b224527 | 475 | struct acpi_power_resource_entry *entry; |
d2ef555b | 476 | int result = 0; |
d2ef555b | 477 | |
0b224527 RW |
478 | list_for_each_entry(entry, list, node) { |
479 | result = acpi_power_on(entry->resource); | |
480 | if (result) | |
481 | goto err; | |
d2ef555b | 482 | } |
0b224527 RW |
483 | return 0; |
484 | ||
485 | err: | |
486 | list_for_each_entry_continue_reverse(entry, list, node) | |
487 | acpi_power_off(entry->resource); | |
d2ef555b RW |
488 | |
489 | return result; | |
490 | } | |
491 | ||
18a38709 RW |
492 | static struct attribute *attrs[] = { |
493 | NULL, | |
494 | }; | |
495 | ||
26408b24 | 496 | static const struct attribute_group attr_groups[] = { |
18a38709 RW |
497 | [ACPI_STATE_D0] = { |
498 | .name = "power_resources_D0", | |
499 | .attrs = attrs, | |
500 | }, | |
501 | [ACPI_STATE_D1] = { | |
502 | .name = "power_resources_D1", | |
503 | .attrs = attrs, | |
504 | }, | |
505 | [ACPI_STATE_D2] = { | |
506 | .name = "power_resources_D2", | |
507 | .attrs = attrs, | |
508 | }, | |
509 | [ACPI_STATE_D3_HOT] = { | |
510 | .name = "power_resources_D3hot", | |
511 | .attrs = attrs, | |
512 | }, | |
513 | }; | |
514 | ||
26408b24 | 515 | static const struct attribute_group wakeup_attr_group = { |
41a2a466 RW |
516 | .name = "power_resources_wakeup", |
517 | .attrs = attrs, | |
518 | }; | |
519 | ||
520 | static void acpi_power_hide_list(struct acpi_device *adev, | |
521 | struct list_head *resources, | |
26408b24 | 522 | const struct attribute_group *attr_group) |
18a38709 | 523 | { |
18a38709 RW |
524 | struct acpi_power_resource_entry *entry; |
525 | ||
41a2a466 | 526 | if (list_empty(resources)) |
18a38709 RW |
527 | return; |
528 | ||
41a2a466 | 529 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
530 | struct acpi_device *res_dev = &entry->resource->device; |
531 | ||
532 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 533 | attr_group->name, |
18a38709 RW |
534 | dev_name(&res_dev->dev)); |
535 | } | |
41a2a466 | 536 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
537 | } |
538 | ||
41a2a466 RW |
539 | static void acpi_power_expose_list(struct acpi_device *adev, |
540 | struct list_head *resources, | |
26408b24 | 541 | const struct attribute_group *attr_group) |
0090def6 | 542 | { |
18a38709 RW |
543 | struct acpi_power_resource_entry *entry; |
544 | int ret; | |
545 | ||
41a2a466 | 546 | if (list_empty(resources)) |
18a38709 RW |
547 | return; |
548 | ||
41a2a466 | 549 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
550 | if (ret) |
551 | return; | |
552 | ||
41a2a466 | 553 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
554 | struct acpi_device *res_dev = &entry->resource->device; |
555 | ||
556 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 557 | attr_group->name, |
18a38709 RW |
558 | &res_dev->dev.kobj, |
559 | dev_name(&res_dev->dev)); | |
560 | if (ret) { | |
41a2a466 | 561 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 562 | break; |
0090def6 LM |
563 | } |
564 | } | |
0090def6 | 565 | } |
bc9b6407 | 566 | |
41a2a466 RW |
567 | static void acpi_power_expose_hide(struct acpi_device *adev, |
568 | struct list_head *resources, | |
26408b24 | 569 | const struct attribute_group *attr_group, |
41a2a466 RW |
570 | bool expose) |
571 | { | |
572 | if (expose) | |
573 | acpi_power_expose_list(adev, resources, attr_group); | |
574 | else | |
575 | acpi_power_hide_list(adev, resources, attr_group); | |
576 | } | |
577 | ||
18a38709 RW |
578 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
579 | { | |
18a38709 RW |
580 | int state; |
581 | ||
41a2a466 RW |
582 | if (adev->wakeup.flags.valid) |
583 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
584 | &wakeup_attr_group, add); | |
585 | ||
18a38709 RW |
586 | if (!adev->power.flags.power_resources) |
587 | return; | |
588 | ||
41a2a466 RW |
589 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
590 | acpi_power_expose_hide(adev, | |
591 | &adev->power.states[state].resources, | |
592 | &attr_groups[state], add); | |
18a38709 RW |
593 | } |
594 | ||
b5d667eb | 595 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
596 | { |
597 | struct acpi_power_resource_entry *entry; | |
598 | int system_level = 5; | |
599 | ||
600 | list_for_each_entry(entry, list, node) { | |
601 | struct acpi_power_resource *resource = entry->resource; | |
b5d667eb RW |
602 | acpi_handle handle = resource->device.handle; |
603 | int result; | |
604 | int state; | |
0596a52b | 605 | |
b5d667eb RW |
606 | mutex_lock(&resource->resource_lock); |
607 | ||
608 | result = acpi_power_get_state(handle, &state); | |
609 | if (result) { | |
610 | mutex_unlock(&resource->resource_lock); | |
611 | return result; | |
612 | } | |
613 | if (state == ACPI_POWER_RESOURCE_STATE_ON) { | |
614 | resource->ref_count++; | |
615 | resource->wakeup_enabled = true; | |
616 | } | |
0596a52b RW |
617 | if (system_level > resource->system_level) |
618 | system_level = resource->system_level; | |
b5d667eb RW |
619 | |
620 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 621 | } |
b5d667eb RW |
622 | *system_level_p = system_level; |
623 | return 0; | |
0596a52b RW |
624 | } |
625 | ||
bc9b6407 RW |
626 | /* -------------------------------------------------------------------------- |
627 | Device Power Management | |
628 | -------------------------------------------------------------------------- */ | |
0090def6 | 629 | |
77e76609 RW |
630 | /** |
631 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
632 | * ACPI 3.0) _PSW (Power State Wake) | |
633 | * @dev: Device to handle. | |
634 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
635 | * @sleep_state: Target sleep state of the system. | |
636 | * @dev_state: Target power state of the device. | |
637 | * | |
638 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
639 | * State Wake) for the device, if present. On failure reset the device's | |
640 | * wakeup.flags.valid flag. | |
641 | * | |
642 | * RETURN VALUE: | |
643 | * 0 if either _DSW or _PSW has been successfully executed | |
644 | * 0 if neither _DSW nor _PSW has been found | |
645 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
646 | */ | |
647 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
c6237b21 | 648 | int enable, int sleep_state, int dev_state) |
77e76609 RW |
649 | { |
650 | union acpi_object in_arg[3]; | |
651 | struct acpi_object_list arg_list = { 3, in_arg }; | |
652 | acpi_status status = AE_OK; | |
653 | ||
654 | /* | |
655 | * Try to execute _DSW first. | |
656 | * | |
603fadf3 | 657 | * Three arguments are needed for the _DSW object: |
77e76609 RW |
658 | * Argument 0: enable/disable the wake capabilities |
659 | * Argument 1: target system state | |
660 | * Argument 2: target device state | |
661 | * When _DSW object is called to disable the wake capabilities, maybe | |
603fadf3 | 662 | * the first argument is filled. The values of the other two arguments |
77e76609 RW |
663 | * are meaningless. |
664 | */ | |
665 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
666 | in_arg[0].integer.value = enable; | |
667 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
668 | in_arg[1].integer.value = sleep_state; | |
669 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
670 | in_arg[2].integer.value = dev_state; | |
671 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
672 | if (ACPI_SUCCESS(status)) { | |
673 | return 0; | |
674 | } else if (status != AE_NOT_FOUND) { | |
675 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
676 | dev->wakeup.flags.valid = 0; | |
677 | return -ENODEV; | |
678 | } | |
679 | ||
680 | /* Execute _PSW */ | |
0db98202 | 681 | status = acpi_execute_simple_method(dev->handle, "_PSW", enable); |
77e76609 RW |
682 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
683 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
684 | dev->wakeup.flags.valid = 0; | |
685 | return -ENODEV; | |
686 | } | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
1da177e4 LT |
691 | /* |
692 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
c6237b21 | 693 | * 1. Power on the power resources required for the wakeup device |
77e76609 RW |
694 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
695 | * State Wake) for the device, if present | |
1da177e4 | 696 | */ |
77e76609 | 697 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 698 | { |
b5d667eb | 699 | struct acpi_power_resource_entry *entry; |
993cbe59 | 700 | int err = 0; |
1da177e4 | 701 | |
1da177e4 | 702 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 703 | return -EINVAL; |
1da177e4 | 704 | |
9b83ccd2 RW |
705 | mutex_lock(&acpi_device_lock); |
706 | ||
707 | if (dev->wakeup.prepare_count++) | |
708 | goto out; | |
0af4b8c4 | 709 | |
b5d667eb RW |
710 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
711 | struct acpi_power_resource *resource = entry->resource; | |
712 | ||
713 | mutex_lock(&resource->resource_lock); | |
714 | ||
715 | if (!resource->wakeup_enabled) { | |
716 | err = acpi_power_on_unlocked(resource); | |
717 | if (!err) | |
718 | resource->wakeup_enabled = true; | |
719 | } | |
720 | ||
721 | mutex_unlock(&resource->resource_lock); | |
722 | ||
723 | if (err) { | |
724 | dev_err(&dev->dev, | |
725 | "Cannot turn wakeup power resources on\n"); | |
726 | dev->wakeup.flags.valid = 0; | |
727 | goto out; | |
728 | } | |
1da177e4 | 729 | } |
b5d667eb RW |
730 | /* |
731 | * Passing 3 as the third argument below means the device may be | |
732 | * put into arbitrary power state afterward. | |
733 | */ | |
734 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
9b83ccd2 RW |
735 | if (err) |
736 | dev->wakeup.prepare_count = 0; | |
737 | ||
738 | out: | |
739 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 740 | return err; |
1da177e4 LT |
741 | } |
742 | ||
743 | /* | |
744 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
745 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
746 | * State Wake) for the device, if present | |
1da177e4 LT |
747 | * 2. Shutdown down the power resources |
748 | */ | |
4be44fcd | 749 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 750 | { |
b5d667eb | 751 | struct acpi_power_resource_entry *entry; |
993cbe59 | 752 | int err = 0; |
1da177e4 LT |
753 | |
754 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 755 | return -EINVAL; |
1da177e4 | 756 | |
9b83ccd2 RW |
757 | mutex_lock(&acpi_device_lock); |
758 | ||
759 | if (--dev->wakeup.prepare_count > 0) | |
760 | goto out; | |
761 | ||
0af4b8c4 | 762 | /* |
9b83ccd2 RW |
763 | * Executing the code below even if prepare_count is already zero when |
764 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 765 | */ |
9b83ccd2 RW |
766 | if (dev->wakeup.prepare_count < 0) |
767 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 768 | |
9b83ccd2 RW |
769 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
770 | if (err) | |
771 | goto out; | |
1da177e4 | 772 | |
b5d667eb RW |
773 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
774 | struct acpi_power_resource *resource = entry->resource; | |
775 | ||
776 | mutex_lock(&resource->resource_lock); | |
777 | ||
778 | if (resource->wakeup_enabled) { | |
779 | err = acpi_power_off_unlocked(resource); | |
780 | if (!err) | |
781 | resource->wakeup_enabled = false; | |
782 | } | |
783 | ||
784 | mutex_unlock(&resource->resource_lock); | |
785 | ||
786 | if (err) { | |
787 | dev_err(&dev->dev, | |
788 | "Cannot turn wakeup power resources off\n"); | |
789 | dev->wakeup.flags.valid = 0; | |
790 | break; | |
791 | } | |
1da177e4 LT |
792 | } |
793 | ||
9b83ccd2 RW |
794 | out: |
795 | mutex_unlock(&acpi_device_lock); | |
796 | return err; | |
1da177e4 LT |
797 | } |
798 | ||
32a00d27 | 799 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 800 | { |
4be44fcd | 801 | int result = 0; |
4be44fcd LB |
802 | int list_state = 0; |
803 | int i = 0; | |
1da177e4 | 804 | |
32a00d27 | 805 | if (!device || !state) |
d550d98d | 806 | return -EINVAL; |
1da177e4 | 807 | |
1da177e4 LT |
808 | /* |
809 | * We know a device's inferred power state when all the resources | |
810 | * required for a given D-state are 'on'. | |
811 | */ | |
38c92fff | 812 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
813 | struct list_head *list = &device->power.states[i].resources; |
814 | ||
815 | if (list_empty(list)) | |
1da177e4 LT |
816 | continue; |
817 | ||
818 | result = acpi_power_get_list_state(list, &list_state); | |
819 | if (result) | |
d550d98d | 820 | return result; |
1da177e4 LT |
821 | |
822 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 823 | *state = i; |
d550d98d | 824 | return 0; |
1da177e4 LT |
825 | } |
826 | } | |
827 | ||
20dacb71 RW |
828 | *state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ? |
829 | ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT; | |
d550d98d | 830 | return 0; |
1da177e4 LT |
831 | } |
832 | ||
30d3df41 RW |
833 | int acpi_power_on_resources(struct acpi_device *device, int state) |
834 | { | |
87e753b0 | 835 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
836 | return -EINVAL; |
837 | ||
838 | return acpi_power_on_list(&device->power.states[state].resources); | |
839 | } | |
840 | ||
4be44fcd | 841 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 842 | { |
5c7dd710 | 843 | int result = 0; |
1da177e4 | 844 | |
3ebc81b8 | 845 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 846 | return -EINVAL; |
1da177e4 | 847 | |
0b224527 | 848 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
849 | return 0; |
850 | ||
4be44fcd | 851 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 852 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 853 | return -ENODEV; |
1da177e4 | 854 | |
1da177e4 LT |
855 | /* |
856 | * First we reference all power resources required in the target list | |
d2ef555b RW |
857 | * (e.g. so the device doesn't lose power while transitioning). Then, |
858 | * we dereference all power resources used in the current list. | |
1da177e4 | 859 | */ |
5c7dd710 RW |
860 | if (state < ACPI_STATE_D3_COLD) |
861 | result = acpi_power_on_list( | |
862 | &device->power.states[state].resources); | |
863 | ||
864 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
865 | acpi_power_off_list( |
866 | &device->power.states[device->power.state].resources); | |
1da177e4 | 867 | |
d2ef555b RW |
868 | /* We shouldn't change the state unless the above operations succeed. */ |
869 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 870 | |
d550d98d | 871 | return result; |
1da177e4 LT |
872 | } |
873 | ||
82c7d5ef RW |
874 | static void acpi_release_power_resource(struct device *dev) |
875 | { | |
876 | struct acpi_device *device = to_acpi_device(dev); | |
877 | struct acpi_power_resource *resource; | |
878 | ||
82c7d5ef | 879 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
880 | |
881 | mutex_lock(&power_resource_list_lock); | |
882 | list_del(&resource->list_node); | |
883 | mutex_unlock(&power_resource_list_lock); | |
884 | ||
c0af4175 | 885 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
886 | kfree(resource); |
887 | } | |
1da177e4 | 888 | |
b1c0f99b RW |
889 | static ssize_t acpi_power_in_use_show(struct device *dev, |
890 | struct device_attribute *attr, | |
891 | char *buf) { | |
892 | struct acpi_power_resource *resource; | |
893 | ||
894 | resource = to_power_resource(to_acpi_device(dev)); | |
895 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
896 | } | |
897 | static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL); | |
898 | ||
899 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
900 | { | |
901 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
902 | } | |
903 | ||
d5eefa82 RW |
904 | static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource) |
905 | { | |
906 | mutex_lock(&power_resource_list_lock); | |
907 | ||
908 | if (!list_empty(&acpi_power_resource_list)) { | |
909 | struct acpi_power_resource *r; | |
910 | ||
911 | list_for_each_entry(r, &acpi_power_resource_list, list_node) | |
912 | if (r->order > resource->order) { | |
913 | list_add_tail(&resource->list_node, &r->list_node); | |
914 | goto out; | |
915 | } | |
916 | } | |
917 | list_add_tail(&resource->list_node, &acpi_power_resource_list); | |
918 | ||
919 | out: | |
920 | mutex_unlock(&power_resource_list_lock); | |
921 | } | |
922 | ||
e88c9c60 | 923 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 924 | { |
82c7d5ef RW |
925 | struct acpi_power_resource *resource; |
926 | struct acpi_device *device = NULL; | |
4be44fcd LB |
927 | union acpi_object acpi_object; |
928 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
929 | acpi_status status; |
930 | int state, result = -ENODEV; | |
1da177e4 | 931 | |
82c7d5ef RW |
932 | acpi_bus_get_device(handle, &device); |
933 | if (device) | |
e88c9c60 | 934 | return 0; |
1da177e4 | 935 | |
82c7d5ef | 936 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 937 | if (!resource) |
e88c9c60 | 938 | return -ENOMEM; |
1da177e4 | 939 | |
82c7d5ef RW |
940 | device = &resource->device; |
941 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
6091b263 | 942 | ACPI_STA_DEFAULT, NULL); |
0a613902 | 943 | mutex_init(&resource->resource_lock); |
6ee22e9d | 944 | INIT_LIST_HEAD(&resource->list_node); |
4533771c | 945 | INIT_LIST_HEAD(&resource->dependents); |
82c7d5ef | 946 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
947 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
948 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 949 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
950 | |
951 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
952 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
953 | if (ACPI_FAILURE(status)) | |
781d737c | 954 | goto err; |
82c7d5ef | 955 | |
1da177e4 LT |
956 | resource->system_level = acpi_object.power_resource.system_level; |
957 | resource->order = acpi_object.power_resource.resource_order; | |
958 | ||
82c7d5ef | 959 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 960 | if (result) |
781d737c | 961 | goto err; |
1da177e4 | 962 | |
1da177e4 | 963 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 964 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 965 | |
82c7d5ef | 966 | device->flags.match_driver = true; |
cf860be6 | 967 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 968 | if (result) |
781d737c | 969 | goto err; |
4be44fcd | 970 | |
b1c0f99b RW |
971 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
972 | device->remove = acpi_power_sysfs_remove; | |
973 | ||
d5eefa82 | 974 | acpi_power_add_resource_to_list(resource); |
cf860be6 | 975 | acpi_device_add_finalize(device); |
e88c9c60 | 976 | return 0; |
1da177e4 | 977 | |
781d737c RW |
978 | err: |
979 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 980 | return result; |
781d737c | 981 | } |
1da177e4 | 982 | |
781d737c RW |
983 | #ifdef CONFIG_ACPI_SLEEP |
984 | void acpi_resume_power_resources(void) | |
0a613902 | 985 | { |
3e384ee6 | 986 | struct acpi_power_resource *resource; |
0a613902 | 987 | |
781d737c | 988 | mutex_lock(&power_resource_list_lock); |
0a613902 | 989 | |
781d737c RW |
990 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
991 | int result, state; | |
0a613902 | 992 | |
781d737c | 993 | mutex_lock(&resource->resource_lock); |
0a613902 | 994 | |
781d737c | 995 | result = acpi_power_get_state(resource->device.handle, &state); |
d7d49012 LT |
996 | if (result) { |
997 | mutex_unlock(&resource->resource_lock); | |
660b1113 | 998 | continue; |
d7d49012 | 999 | } |
660b1113 RW |
1000 | |
1001 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c RW |
1002 | && resource->ref_count) { |
1003 | dev_info(&resource->device.dev, "Turning ON\n"); | |
1004 | __acpi_power_on(resource); | |
d5eefa82 RW |
1005 | } |
1006 | ||
1007 | mutex_unlock(&resource->resource_lock); | |
1008 | } | |
8ece1d83 HG |
1009 | |
1010 | mutex_unlock(&power_resource_list_lock); | |
1011 | } | |
1012 | ||
1013 | void acpi_turn_off_unused_power_resources(void) | |
1014 | { | |
1015 | struct acpi_power_resource *resource; | |
1016 | ||
1017 | mutex_lock(&power_resource_list_lock); | |
1018 | ||
d5eefa82 RW |
1019 | list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) { |
1020 | int result, state; | |
1021 | ||
1022 | mutex_lock(&resource->resource_lock); | |
1023 | ||
1024 | result = acpi_power_get_state(resource->device.handle, &state); | |
1025 | if (result) { | |
1026 | mutex_unlock(&resource->resource_lock); | |
1027 | continue; | |
1028 | } | |
1029 | ||
1030 | if (state == ACPI_POWER_RESOURCE_STATE_ON | |
660b1113 RW |
1031 | && !resource->ref_count) { |
1032 | dev_info(&resource->device.dev, "Turning OFF\n"); | |
1033 | __acpi_power_off(resource); | |
781d737c | 1034 | } |
0a613902 | 1035 | |
781d737c RW |
1036 | mutex_unlock(&resource->resource_lock); |
1037 | } | |
3e384ee6 | 1038 | |
781d737c | 1039 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 1040 | } |
90692404 | 1041 | #endif |