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Commit | Line | Data |
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1da177e4 | 1 | /* |
aa57aca8 | 2 | * drivers/acpi/power.c - ACPI Power Resources management. |
1da177e4 | 3 | * |
aa57aca8 RW |
4 | * Copyright (C) 2001 - 2015 Intel Corp. |
5 | * Author: Andy Grover <andrew.grover@intel.com> | |
6 | * Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
7 | * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
1da177e4 LT |
8 | * |
9 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or (at | |
14 | * your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, but | |
17 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | * | |
1da177e4 LT |
21 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
22 | */ | |
23 | ||
24 | /* | |
25 | * ACPI power-managed devices may be controlled in two ways: | |
26 | * 1. via "Device Specific (D-State) Control" | |
27 | * 2. via "Power Resource Control". | |
aa57aca8 | 28 | * The code below deals with ACPI Power Resources control. |
1da177e4 | 29 | * |
aa57aca8 RW |
30 | * An ACPI "power resource object" represents a software controllable power |
31 | * plane, clock plane, or other resource depended on by a device. | |
32 | * | |
1da177e4 LT |
33 | * A device may rely on multiple power resources, and a power resource |
34 | * may be shared by multiple devices. | |
35 | */ | |
36 | ||
37 | #include <linux/kernel.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/types.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
0090def6 | 42 | #include <linux/pm_runtime.h> |
18a38709 | 43 | #include <linux/sysfs.h> |
8b48463f | 44 | #include <linux/acpi.h> |
9b83ccd2 | 45 | #include "sleep.h" |
0090def6 | 46 | #include "internal.h" |
9b83ccd2 | 47 | |
89595b8f | 48 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 49 | ACPI_MODULE_NAME("power"); |
1da177e4 | 50 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 LT |
51 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
52 | #define ACPI_POWER_FILE_INFO "info" | |
53 | #define ACPI_POWER_FILE_STATUS "state" | |
54 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
55 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
56 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 57 | |
4be44fcd | 58 | struct acpi_power_resource { |
82c7d5ef | 59 | struct acpi_device device; |
781d737c | 60 | struct list_head list_node; |
82c7d5ef | 61 | char *name; |
4be44fcd LB |
62 | u32 system_level; |
63 | u32 order; | |
3e384ee6 | 64 | unsigned int ref_count; |
b5d667eb | 65 | bool wakeup_enabled; |
0a613902 | 66 | struct mutex resource_lock; |
1da177e4 LT |
67 | }; |
68 | ||
0b224527 RW |
69 | struct acpi_power_resource_entry { |
70 | struct list_head node; | |
71 | struct acpi_power_resource *resource; | |
72 | }; | |
73 | ||
781d737c RW |
74 | static LIST_HEAD(acpi_power_resource_list); |
75 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 76 | |
1da177e4 LT |
77 | /* -------------------------------------------------------------------------- |
78 | Power Resource Management | |
79 | -------------------------------------------------------------------------- */ | |
80 | ||
b1c0f99b RW |
81 | static inline |
82 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
83 | { | |
84 | return container_of(device, struct acpi_power_resource, device); | |
85 | } | |
86 | ||
82c7d5ef | 87 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 88 | { |
82c7d5ef | 89 | struct acpi_device *device; |
1da177e4 | 90 | |
82c7d5ef RW |
91 | if (acpi_bus_get_device(handle, &device)) |
92 | return NULL; | |
1da177e4 | 93 | |
b1c0f99b | 94 | return to_power_resource(device); |
1da177e4 LT |
95 | } |
96 | ||
e88c9c60 RW |
97 | static int acpi_power_resources_list_add(acpi_handle handle, |
98 | struct list_head *list) | |
0b224527 RW |
99 | { |
100 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
101 | struct acpi_power_resource_entry *entry; | |
102 | ||
103 | if (!resource || !list) | |
e88c9c60 | 104 | return -EINVAL; |
0b224527 RW |
105 | |
106 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
107 | if (!entry) | |
e88c9c60 | 108 | return -ENOMEM; |
0b224527 RW |
109 | |
110 | entry->resource = resource; | |
111 | if (!list_empty(list)) { | |
112 | struct acpi_power_resource_entry *e; | |
113 | ||
114 | list_for_each_entry(e, list, node) | |
115 | if (e->resource->order > resource->order) { | |
116 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 117 | return 0; |
0b224527 RW |
118 | } |
119 | } | |
120 | list_add_tail(&entry->node, list); | |
e88c9c60 | 121 | return 0; |
0b224527 RW |
122 | } |
123 | ||
124 | void acpi_power_resources_list_free(struct list_head *list) | |
125 | { | |
126 | struct acpi_power_resource_entry *entry, *e; | |
127 | ||
128 | list_for_each_entry_safe(entry, e, list, node) { | |
129 | list_del(&entry->node); | |
130 | kfree(entry); | |
131 | } | |
132 | } | |
133 | ||
e88c9c60 RW |
134 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
135 | struct list_head *list) | |
ef85bdbe | 136 | { |
ef85bdbe | 137 | unsigned int i; |
e88c9c60 | 138 | int err = 0; |
ef85bdbe RW |
139 | |
140 | for (i = start; i < package->package.count; i++) { | |
141 | union acpi_object *element = &package->package.elements[i]; | |
142 | acpi_handle rhandle; | |
143 | ||
144 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 145 | err = -ENODATA; |
ef85bdbe RW |
146 | break; |
147 | } | |
148 | rhandle = element->reference.handle; | |
149 | if (!rhandle) { | |
e88c9c60 | 150 | err = -ENODEV; |
ef85bdbe RW |
151 | break; |
152 | } | |
e88c9c60 RW |
153 | err = acpi_add_power_resource(rhandle); |
154 | if (err) | |
155 | break; | |
156 | ||
157 | err = acpi_power_resources_list_add(rhandle, list); | |
158 | if (err) | |
159 | break; | |
ef85bdbe | 160 | } |
e88c9c60 | 161 | if (err) |
ef85bdbe RW |
162 | acpi_power_resources_list_free(list); |
163 | ||
e88c9c60 | 164 | return err; |
ef85bdbe RW |
165 | } |
166 | ||
a51e145f | 167 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 168 | { |
4be44fcd | 169 | acpi_status status = AE_OK; |
27663c58 | 170 | unsigned long long sta = 0; |
60a4ce7f LM |
171 | char node_name[5]; |
172 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 173 | |
1da177e4 | 174 | |
a51e145f | 175 | if (!handle || !state) |
d550d98d | 176 | return -EINVAL; |
1da177e4 | 177 | |
a51e145f | 178 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 179 | if (ACPI_FAILURE(status)) |
d550d98d | 180 | return -ENODEV; |
1da177e4 | 181 | |
c35923bc AS |
182 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
183 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 184 | |
60a4ce7f LM |
185 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
186 | ||
1da177e4 | 187 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 188 | node_name, |
b1b57fbe | 189 | *state ? "on" : "off")); |
1da177e4 | 190 | |
d550d98d | 191 | return 0; |
1da177e4 LT |
192 | } |
193 | ||
0b224527 | 194 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 195 | { |
0b224527 | 196 | struct acpi_power_resource_entry *entry; |
d0515d9f | 197 | int cur_state; |
1da177e4 LT |
198 | |
199 | if (!list || !state) | |
d550d98d | 200 | return -EINVAL; |
1da177e4 LT |
201 | |
202 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
0b224527 RW |
203 | list_for_each_entry(entry, list, node) { |
204 | struct acpi_power_resource *resource = entry->resource; | |
205 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
206 | int result; |
207 | ||
d0515d9f | 208 | mutex_lock(&resource->resource_lock); |
d0515d9f | 209 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 210 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
211 | if (result) |
212 | return result; | |
213 | ||
214 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
215 | break; |
216 | } | |
217 | ||
218 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 219 | cur_state ? "on" : "off")); |
1da177e4 | 220 | |
d0515d9f | 221 | *state = cur_state; |
d0515d9f | 222 | return 0; |
1da177e4 LT |
223 | } |
224 | ||
3e384ee6 | 225 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 226 | { |
4be44fcd | 227 | acpi_status status = AE_OK; |
1da177e4 | 228 | |
82c7d5ef | 229 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
230 | if (ACPI_FAILURE(status)) |
231 | return -ENODEV; | |
232 | ||
3e384ee6 RW |
233 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
234 | resource->name)); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
b5d667eb | 239 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 240 | { |
b5d667eb | 241 | int result = 0; |
0a613902 | 242 | |
3e384ee6 RW |
243 | if (resource->ref_count++) { |
244 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 245 | "Power resource [%s] already on\n", |
3e384ee6 RW |
246 | resource->name)); |
247 | } else { | |
248 | result = __acpi_power_on(resource); | |
41863fce | 249 | if (result) |
12b3b5af | 250 | resource->ref_count--; |
40bf66ec | 251 | } |
b5d667eb RW |
252 | return result; |
253 | } | |
40bf66ec | 254 | |
b5d667eb RW |
255 | static int acpi_power_on(struct acpi_power_resource *resource) |
256 | { | |
257 | int result; | |
40bf66ec | 258 | |
b5d667eb RW |
259 | mutex_lock(&resource->resource_lock); |
260 | result = acpi_power_on_unlocked(resource); | |
261 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 262 | return result; |
1da177e4 LT |
263 | } |
264 | ||
660b1113 RW |
265 | static int __acpi_power_off(struct acpi_power_resource *resource) |
266 | { | |
267 | acpi_status status; | |
268 | ||
269 | status = acpi_evaluate_object(resource->device.handle, "_OFF", | |
270 | NULL, NULL); | |
271 | if (ACPI_FAILURE(status)) | |
272 | return -ENODEV; | |
273 | ||
274 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n", | |
275 | resource->name)); | |
276 | return 0; | |
277 | } | |
278 | ||
b5d667eb | 279 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 280 | { |
0b224527 | 281 | int result = 0; |
1da177e4 | 282 | |
3e384ee6 RW |
283 | if (!resource->ref_count) { |
284 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 285 | "Power resource [%s] already off\n", |
3e384ee6 | 286 | resource->name)); |
b5d667eb | 287 | return 0; |
0a613902 | 288 | } |
1da177e4 | 289 | |
3e384ee6 RW |
290 | if (--resource->ref_count) { |
291 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
292 | "Power resource [%s] still in use\n", | |
293 | resource->name)); | |
660b1113 RW |
294 | } else { |
295 | result = __acpi_power_off(resource); | |
296 | if (result) | |
297 | resource->ref_count++; | |
1da177e4 | 298 | } |
b5d667eb RW |
299 | return result; |
300 | } | |
1da177e4 | 301 | |
b5d667eb RW |
302 | static int acpi_power_off(struct acpi_power_resource *resource) |
303 | { | |
304 | int result; | |
1da177e4 | 305 | |
b5d667eb RW |
306 | mutex_lock(&resource->resource_lock); |
307 | result = acpi_power_off_unlocked(resource); | |
308 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 309 | return result; |
1da177e4 LT |
310 | } |
311 | ||
0b224527 | 312 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 313 | { |
0b224527 RW |
314 | struct acpi_power_resource_entry *entry; |
315 | int result = 0; | |
d2ef555b | 316 | |
0b224527 RW |
317 | list_for_each_entry_reverse(entry, list, node) { |
318 | result = acpi_power_off(entry->resource); | |
319 | if (result) | |
320 | goto err; | |
321 | } | |
322 | return 0; | |
d2ef555b | 323 | |
0b224527 RW |
324 | err: |
325 | list_for_each_entry_continue(entry, list, node) | |
326 | acpi_power_on(entry->resource); | |
327 | ||
328 | return result; | |
d2ef555b RW |
329 | } |
330 | ||
0b224527 | 331 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 332 | { |
0b224527 | 333 | struct acpi_power_resource_entry *entry; |
d2ef555b | 334 | int result = 0; |
d2ef555b | 335 | |
0b224527 RW |
336 | list_for_each_entry(entry, list, node) { |
337 | result = acpi_power_on(entry->resource); | |
338 | if (result) | |
339 | goto err; | |
d2ef555b | 340 | } |
0b224527 RW |
341 | return 0; |
342 | ||
343 | err: | |
344 | list_for_each_entry_continue_reverse(entry, list, node) | |
345 | acpi_power_off(entry->resource); | |
d2ef555b RW |
346 | |
347 | return result; | |
348 | } | |
349 | ||
18a38709 RW |
350 | static struct attribute *attrs[] = { |
351 | NULL, | |
352 | }; | |
353 | ||
354 | static struct attribute_group attr_groups[] = { | |
355 | [ACPI_STATE_D0] = { | |
356 | .name = "power_resources_D0", | |
357 | .attrs = attrs, | |
358 | }, | |
359 | [ACPI_STATE_D1] = { | |
360 | .name = "power_resources_D1", | |
361 | .attrs = attrs, | |
362 | }, | |
363 | [ACPI_STATE_D2] = { | |
364 | .name = "power_resources_D2", | |
365 | .attrs = attrs, | |
366 | }, | |
367 | [ACPI_STATE_D3_HOT] = { | |
368 | .name = "power_resources_D3hot", | |
369 | .attrs = attrs, | |
370 | }, | |
371 | }; | |
372 | ||
41a2a466 RW |
373 | static struct attribute_group wakeup_attr_group = { |
374 | .name = "power_resources_wakeup", | |
375 | .attrs = attrs, | |
376 | }; | |
377 | ||
378 | static void acpi_power_hide_list(struct acpi_device *adev, | |
379 | struct list_head *resources, | |
380 | struct attribute_group *attr_group) | |
18a38709 | 381 | { |
18a38709 RW |
382 | struct acpi_power_resource_entry *entry; |
383 | ||
41a2a466 | 384 | if (list_empty(resources)) |
18a38709 RW |
385 | return; |
386 | ||
41a2a466 | 387 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
388 | struct acpi_device *res_dev = &entry->resource->device; |
389 | ||
390 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 391 | attr_group->name, |
18a38709 RW |
392 | dev_name(&res_dev->dev)); |
393 | } | |
41a2a466 | 394 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
395 | } |
396 | ||
41a2a466 RW |
397 | static void acpi_power_expose_list(struct acpi_device *adev, |
398 | struct list_head *resources, | |
399 | struct attribute_group *attr_group) | |
0090def6 | 400 | { |
18a38709 RW |
401 | struct acpi_power_resource_entry *entry; |
402 | int ret; | |
403 | ||
41a2a466 | 404 | if (list_empty(resources)) |
18a38709 RW |
405 | return; |
406 | ||
41a2a466 | 407 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
408 | if (ret) |
409 | return; | |
410 | ||
41a2a466 | 411 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
412 | struct acpi_device *res_dev = &entry->resource->device; |
413 | ||
414 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 415 | attr_group->name, |
18a38709 RW |
416 | &res_dev->dev.kobj, |
417 | dev_name(&res_dev->dev)); | |
418 | if (ret) { | |
41a2a466 | 419 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 420 | break; |
0090def6 LM |
421 | } |
422 | } | |
0090def6 | 423 | } |
bc9b6407 | 424 | |
41a2a466 RW |
425 | static void acpi_power_expose_hide(struct acpi_device *adev, |
426 | struct list_head *resources, | |
427 | struct attribute_group *attr_group, | |
428 | bool expose) | |
429 | { | |
430 | if (expose) | |
431 | acpi_power_expose_list(adev, resources, attr_group); | |
432 | else | |
433 | acpi_power_hide_list(adev, resources, attr_group); | |
434 | } | |
435 | ||
18a38709 RW |
436 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
437 | { | |
18a38709 RW |
438 | int state; |
439 | ||
41a2a466 RW |
440 | if (adev->wakeup.flags.valid) |
441 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
442 | &wakeup_attr_group, add); | |
443 | ||
18a38709 RW |
444 | if (!adev->power.flags.power_resources) |
445 | return; | |
446 | ||
41a2a466 RW |
447 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
448 | acpi_power_expose_hide(adev, | |
449 | &adev->power.states[state].resources, | |
450 | &attr_groups[state], add); | |
18a38709 RW |
451 | } |
452 | ||
b5d667eb | 453 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
454 | { |
455 | struct acpi_power_resource_entry *entry; | |
456 | int system_level = 5; | |
457 | ||
458 | list_for_each_entry(entry, list, node) { | |
459 | struct acpi_power_resource *resource = entry->resource; | |
b5d667eb RW |
460 | acpi_handle handle = resource->device.handle; |
461 | int result; | |
462 | int state; | |
0596a52b | 463 | |
b5d667eb RW |
464 | mutex_lock(&resource->resource_lock); |
465 | ||
466 | result = acpi_power_get_state(handle, &state); | |
467 | if (result) { | |
468 | mutex_unlock(&resource->resource_lock); | |
469 | return result; | |
470 | } | |
471 | if (state == ACPI_POWER_RESOURCE_STATE_ON) { | |
472 | resource->ref_count++; | |
473 | resource->wakeup_enabled = true; | |
474 | } | |
0596a52b RW |
475 | if (system_level > resource->system_level) |
476 | system_level = resource->system_level; | |
b5d667eb RW |
477 | |
478 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 479 | } |
b5d667eb RW |
480 | *system_level_p = system_level; |
481 | return 0; | |
0596a52b RW |
482 | } |
483 | ||
bc9b6407 RW |
484 | /* -------------------------------------------------------------------------- |
485 | Device Power Management | |
486 | -------------------------------------------------------------------------- */ | |
0090def6 | 487 | |
77e76609 RW |
488 | /** |
489 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
490 | * ACPI 3.0) _PSW (Power State Wake) | |
491 | * @dev: Device to handle. | |
492 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
493 | * @sleep_state: Target sleep state of the system. | |
494 | * @dev_state: Target power state of the device. | |
495 | * | |
496 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
497 | * State Wake) for the device, if present. On failure reset the device's | |
498 | * wakeup.flags.valid flag. | |
499 | * | |
500 | * RETURN VALUE: | |
501 | * 0 if either _DSW or _PSW has been successfully executed | |
502 | * 0 if neither _DSW nor _PSW has been found | |
503 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
504 | */ | |
505 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
506 | int enable, int sleep_state, int dev_state) | |
507 | { | |
508 | union acpi_object in_arg[3]; | |
509 | struct acpi_object_list arg_list = { 3, in_arg }; | |
510 | acpi_status status = AE_OK; | |
511 | ||
512 | /* | |
513 | * Try to execute _DSW first. | |
514 | * | |
515 | * Three agruments are needed for the _DSW object: | |
516 | * Argument 0: enable/disable the wake capabilities | |
517 | * Argument 1: target system state | |
518 | * Argument 2: target device state | |
519 | * When _DSW object is called to disable the wake capabilities, maybe | |
520 | * the first argument is filled. The values of the other two agruments | |
521 | * are meaningless. | |
522 | */ | |
523 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
524 | in_arg[0].integer.value = enable; | |
525 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
526 | in_arg[1].integer.value = sleep_state; | |
527 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
528 | in_arg[2].integer.value = dev_state; | |
529 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
530 | if (ACPI_SUCCESS(status)) { | |
531 | return 0; | |
532 | } else if (status != AE_NOT_FOUND) { | |
533 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
534 | dev->wakeup.flags.valid = 0; | |
535 | return -ENODEV; | |
536 | } | |
537 | ||
538 | /* Execute _PSW */ | |
0db98202 | 539 | status = acpi_execute_simple_method(dev->handle, "_PSW", enable); |
77e76609 RW |
540 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
541 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
542 | dev->wakeup.flags.valid = 0; | |
543 | return -ENODEV; | |
544 | } | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
1da177e4 LT |
549 | /* |
550 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
551 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
552 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
553 | * State Wake) for the device, if present | |
1da177e4 | 554 | */ |
77e76609 | 555 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 556 | { |
b5d667eb | 557 | struct acpi_power_resource_entry *entry; |
993cbe59 | 558 | int err = 0; |
1da177e4 | 559 | |
1da177e4 | 560 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 561 | return -EINVAL; |
1da177e4 | 562 | |
9b83ccd2 RW |
563 | mutex_lock(&acpi_device_lock); |
564 | ||
565 | if (dev->wakeup.prepare_count++) | |
566 | goto out; | |
0af4b8c4 | 567 | |
b5d667eb RW |
568 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
569 | struct acpi_power_resource *resource = entry->resource; | |
570 | ||
571 | mutex_lock(&resource->resource_lock); | |
572 | ||
573 | if (!resource->wakeup_enabled) { | |
574 | err = acpi_power_on_unlocked(resource); | |
575 | if (!err) | |
576 | resource->wakeup_enabled = true; | |
577 | } | |
578 | ||
579 | mutex_unlock(&resource->resource_lock); | |
580 | ||
581 | if (err) { | |
582 | dev_err(&dev->dev, | |
583 | "Cannot turn wakeup power resources on\n"); | |
584 | dev->wakeup.flags.valid = 0; | |
585 | goto out; | |
586 | } | |
1da177e4 | 587 | } |
b5d667eb RW |
588 | /* |
589 | * Passing 3 as the third argument below means the device may be | |
590 | * put into arbitrary power state afterward. | |
591 | */ | |
592 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
9b83ccd2 RW |
593 | if (err) |
594 | dev->wakeup.prepare_count = 0; | |
595 | ||
596 | out: | |
597 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 598 | return err; |
1da177e4 LT |
599 | } |
600 | ||
601 | /* | |
602 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
603 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
604 | * State Wake) for the device, if present | |
1da177e4 LT |
605 | * 2. Shutdown down the power resources |
606 | */ | |
4be44fcd | 607 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 608 | { |
b5d667eb | 609 | struct acpi_power_resource_entry *entry; |
993cbe59 | 610 | int err = 0; |
1da177e4 LT |
611 | |
612 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 613 | return -EINVAL; |
1da177e4 | 614 | |
9b83ccd2 RW |
615 | mutex_lock(&acpi_device_lock); |
616 | ||
617 | if (--dev->wakeup.prepare_count > 0) | |
618 | goto out; | |
619 | ||
0af4b8c4 | 620 | /* |
9b83ccd2 RW |
621 | * Executing the code below even if prepare_count is already zero when |
622 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 623 | */ |
9b83ccd2 RW |
624 | if (dev->wakeup.prepare_count < 0) |
625 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 626 | |
9b83ccd2 RW |
627 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
628 | if (err) | |
629 | goto out; | |
1da177e4 | 630 | |
b5d667eb RW |
631 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
632 | struct acpi_power_resource *resource = entry->resource; | |
633 | ||
634 | mutex_lock(&resource->resource_lock); | |
635 | ||
636 | if (resource->wakeup_enabled) { | |
637 | err = acpi_power_off_unlocked(resource); | |
638 | if (!err) | |
639 | resource->wakeup_enabled = false; | |
640 | } | |
641 | ||
642 | mutex_unlock(&resource->resource_lock); | |
643 | ||
644 | if (err) { | |
645 | dev_err(&dev->dev, | |
646 | "Cannot turn wakeup power resources off\n"); | |
647 | dev->wakeup.flags.valid = 0; | |
648 | break; | |
649 | } | |
1da177e4 LT |
650 | } |
651 | ||
9b83ccd2 RW |
652 | out: |
653 | mutex_unlock(&acpi_device_lock); | |
654 | return err; | |
1da177e4 LT |
655 | } |
656 | ||
32a00d27 | 657 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 658 | { |
4be44fcd | 659 | int result = 0; |
4be44fcd LB |
660 | int list_state = 0; |
661 | int i = 0; | |
1da177e4 | 662 | |
32a00d27 | 663 | if (!device || !state) |
d550d98d | 664 | return -EINVAL; |
1da177e4 | 665 | |
1da177e4 LT |
666 | /* |
667 | * We know a device's inferred power state when all the resources | |
668 | * required for a given D-state are 'on'. | |
669 | */ | |
38c92fff | 670 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
671 | struct list_head *list = &device->power.states[i].resources; |
672 | ||
673 | if (list_empty(list)) | |
1da177e4 LT |
674 | continue; |
675 | ||
676 | result = acpi_power_get_list_state(list, &list_state); | |
677 | if (result) | |
d550d98d | 678 | return result; |
1da177e4 LT |
679 | |
680 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 681 | *state = i; |
d550d98d | 682 | return 0; |
1da177e4 LT |
683 | } |
684 | } | |
685 | ||
20dacb71 RW |
686 | *state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ? |
687 | ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT; | |
d550d98d | 688 | return 0; |
1da177e4 LT |
689 | } |
690 | ||
30d3df41 RW |
691 | int acpi_power_on_resources(struct acpi_device *device, int state) |
692 | { | |
87e753b0 | 693 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
694 | return -EINVAL; |
695 | ||
696 | return acpi_power_on_list(&device->power.states[state].resources); | |
697 | } | |
698 | ||
4be44fcd | 699 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 700 | { |
5c7dd710 | 701 | int result = 0; |
1da177e4 | 702 | |
3ebc81b8 | 703 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 704 | return -EINVAL; |
1da177e4 | 705 | |
0b224527 | 706 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
707 | return 0; |
708 | ||
4be44fcd | 709 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 710 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 711 | return -ENODEV; |
1da177e4 | 712 | |
1da177e4 LT |
713 | /* |
714 | * First we reference all power resources required in the target list | |
d2ef555b RW |
715 | * (e.g. so the device doesn't lose power while transitioning). Then, |
716 | * we dereference all power resources used in the current list. | |
1da177e4 | 717 | */ |
5c7dd710 RW |
718 | if (state < ACPI_STATE_D3_COLD) |
719 | result = acpi_power_on_list( | |
720 | &device->power.states[state].resources); | |
721 | ||
722 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
723 | acpi_power_off_list( |
724 | &device->power.states[device->power.state].resources); | |
1da177e4 | 725 | |
d2ef555b RW |
726 | /* We shouldn't change the state unless the above operations succeed. */ |
727 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 728 | |
d550d98d | 729 | return result; |
1da177e4 LT |
730 | } |
731 | ||
82c7d5ef RW |
732 | static void acpi_release_power_resource(struct device *dev) |
733 | { | |
734 | struct acpi_device *device = to_acpi_device(dev); | |
735 | struct acpi_power_resource *resource; | |
736 | ||
82c7d5ef | 737 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
738 | |
739 | mutex_lock(&power_resource_list_lock); | |
740 | list_del(&resource->list_node); | |
741 | mutex_unlock(&power_resource_list_lock); | |
742 | ||
c0af4175 | 743 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
744 | kfree(resource); |
745 | } | |
1da177e4 | 746 | |
b1c0f99b RW |
747 | static ssize_t acpi_power_in_use_show(struct device *dev, |
748 | struct device_attribute *attr, | |
749 | char *buf) { | |
750 | struct acpi_power_resource *resource; | |
751 | ||
752 | resource = to_power_resource(to_acpi_device(dev)); | |
753 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
754 | } | |
755 | static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL); | |
756 | ||
757 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
758 | { | |
759 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
760 | } | |
761 | ||
d5eefa82 RW |
762 | static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource) |
763 | { | |
764 | mutex_lock(&power_resource_list_lock); | |
765 | ||
766 | if (!list_empty(&acpi_power_resource_list)) { | |
767 | struct acpi_power_resource *r; | |
768 | ||
769 | list_for_each_entry(r, &acpi_power_resource_list, list_node) | |
770 | if (r->order > resource->order) { | |
771 | list_add_tail(&resource->list_node, &r->list_node); | |
772 | goto out; | |
773 | } | |
774 | } | |
775 | list_add_tail(&resource->list_node, &acpi_power_resource_list); | |
776 | ||
777 | out: | |
778 | mutex_unlock(&power_resource_list_lock); | |
779 | } | |
780 | ||
e88c9c60 | 781 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 782 | { |
82c7d5ef RW |
783 | struct acpi_power_resource *resource; |
784 | struct acpi_device *device = NULL; | |
4be44fcd LB |
785 | union acpi_object acpi_object; |
786 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
787 | acpi_status status; |
788 | int state, result = -ENODEV; | |
1da177e4 | 789 | |
82c7d5ef RW |
790 | acpi_bus_get_device(handle, &device); |
791 | if (device) | |
e88c9c60 | 792 | return 0; |
1da177e4 | 793 | |
82c7d5ef | 794 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 795 | if (!resource) |
e88c9c60 | 796 | return -ENOMEM; |
1da177e4 | 797 | |
82c7d5ef RW |
798 | device = &resource->device; |
799 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
800 | ACPI_STA_DEFAULT); | |
0a613902 | 801 | mutex_init(&resource->resource_lock); |
6ee22e9d | 802 | INIT_LIST_HEAD(&resource->list_node); |
82c7d5ef | 803 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
804 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
805 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 806 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
807 | |
808 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
809 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
810 | if (ACPI_FAILURE(status)) | |
781d737c | 811 | goto err; |
82c7d5ef | 812 | |
1da177e4 LT |
813 | resource->system_level = acpi_object.power_resource.system_level; |
814 | resource->order = acpi_object.power_resource.resource_order; | |
815 | ||
82c7d5ef | 816 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 817 | if (result) |
781d737c | 818 | goto err; |
1da177e4 | 819 | |
1da177e4 | 820 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 821 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 822 | |
82c7d5ef | 823 | device->flags.match_driver = true; |
cf860be6 | 824 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 825 | if (result) |
781d737c | 826 | goto err; |
4be44fcd | 827 | |
b1c0f99b RW |
828 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
829 | device->remove = acpi_power_sysfs_remove; | |
830 | ||
d5eefa82 | 831 | acpi_power_add_resource_to_list(resource); |
cf860be6 | 832 | acpi_device_add_finalize(device); |
e88c9c60 | 833 | return 0; |
1da177e4 | 834 | |
781d737c RW |
835 | err: |
836 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 837 | return result; |
781d737c | 838 | } |
1da177e4 | 839 | |
781d737c RW |
840 | #ifdef CONFIG_ACPI_SLEEP |
841 | void acpi_resume_power_resources(void) | |
0a613902 | 842 | { |
3e384ee6 | 843 | struct acpi_power_resource *resource; |
0a613902 | 844 | |
781d737c | 845 | mutex_lock(&power_resource_list_lock); |
0a613902 | 846 | |
781d737c RW |
847 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
848 | int result, state; | |
0a613902 | 849 | |
781d737c | 850 | mutex_lock(&resource->resource_lock); |
0a613902 | 851 | |
781d737c | 852 | result = acpi_power_get_state(resource->device.handle, &state); |
d7d49012 LT |
853 | if (result) { |
854 | mutex_unlock(&resource->resource_lock); | |
660b1113 | 855 | continue; |
d7d49012 | 856 | } |
660b1113 RW |
857 | |
858 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c RW |
859 | && resource->ref_count) { |
860 | dev_info(&resource->device.dev, "Turning ON\n"); | |
861 | __acpi_power_on(resource); | |
d5eefa82 RW |
862 | } |
863 | ||
864 | mutex_unlock(&resource->resource_lock); | |
865 | } | |
866 | list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) { | |
867 | int result, state; | |
868 | ||
869 | mutex_lock(&resource->resource_lock); | |
870 | ||
871 | result = acpi_power_get_state(resource->device.handle, &state); | |
872 | if (result) { | |
873 | mutex_unlock(&resource->resource_lock); | |
874 | continue; | |
875 | } | |
876 | ||
877 | if (state == ACPI_POWER_RESOURCE_STATE_ON | |
660b1113 RW |
878 | && !resource->ref_count) { |
879 | dev_info(&resource->device.dev, "Turning OFF\n"); | |
880 | __acpi_power_off(resource); | |
781d737c | 881 | } |
0a613902 | 882 | |
781d737c RW |
883 | mutex_unlock(&resource->resource_lock); |
884 | } | |
3e384ee6 | 885 | |
781d737c | 886 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 887 | } |
90692404 | 888 | #endif |