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1da177e4 LT |
1 | /* |
2 | * acpi_power.c - ACPI Bus Power Management ($Revision: 39 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | /* | |
27 | * ACPI power-managed devices may be controlled in two ways: | |
28 | * 1. via "Device Specific (D-State) Control" | |
29 | * 2. via "Power Resource Control". | |
30 | * This module is used to manage devices relying on Power Resource Control. | |
31 | * | |
32 | * An ACPI "power resource object" describes a software controllable power | |
33 | * plane, clock plane, or other resource used by a power managed device. | |
34 | * A device may rely on multiple power resources, and a power resource | |
35 | * may be shared by multiple devices. | |
36 | */ | |
37 | ||
38 | #include <linux/kernel.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/types.h> | |
5a0e3ad6 | 42 | #include <linux/slab.h> |
0090def6 | 43 | #include <linux/pm_runtime.h> |
18a38709 | 44 | #include <linux/sysfs.h> |
1da177e4 LT |
45 | #include <acpi/acpi_bus.h> |
46 | #include <acpi/acpi_drivers.h> | |
9b83ccd2 | 47 | #include "sleep.h" |
0090def6 | 48 | #include "internal.h" |
9b83ccd2 | 49 | |
a192a958 LB |
50 | #define PREFIX "ACPI: " |
51 | ||
89595b8f | 52 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 53 | ACPI_MODULE_NAME("power"); |
1da177e4 | 54 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 LT |
55 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
56 | #define ACPI_POWER_FILE_INFO "info" | |
57 | #define ACPI_POWER_FILE_STATUS "state" | |
58 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
59 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
60 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 61 | |
4be44fcd | 62 | struct acpi_power_resource { |
82c7d5ef | 63 | struct acpi_device device; |
781d737c | 64 | struct list_head list_node; |
82c7d5ef | 65 | char *name; |
4be44fcd LB |
66 | u32 system_level; |
67 | u32 order; | |
3e384ee6 | 68 | unsigned int ref_count; |
b5d667eb | 69 | bool wakeup_enabled; |
0a613902 | 70 | struct mutex resource_lock; |
1da177e4 LT |
71 | }; |
72 | ||
0b224527 RW |
73 | struct acpi_power_resource_entry { |
74 | struct list_head node; | |
75 | struct acpi_power_resource *resource; | |
76 | }; | |
77 | ||
781d737c RW |
78 | static LIST_HEAD(acpi_power_resource_list); |
79 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 80 | |
1da177e4 LT |
81 | /* -------------------------------------------------------------------------- |
82 | Power Resource Management | |
83 | -------------------------------------------------------------------------- */ | |
84 | ||
b1c0f99b RW |
85 | static inline |
86 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
87 | { | |
88 | return container_of(device, struct acpi_power_resource, device); | |
89 | } | |
90 | ||
82c7d5ef | 91 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 92 | { |
82c7d5ef | 93 | struct acpi_device *device; |
1da177e4 | 94 | |
82c7d5ef RW |
95 | if (acpi_bus_get_device(handle, &device)) |
96 | return NULL; | |
1da177e4 | 97 | |
b1c0f99b | 98 | return to_power_resource(device); |
1da177e4 LT |
99 | } |
100 | ||
e88c9c60 RW |
101 | static int acpi_power_resources_list_add(acpi_handle handle, |
102 | struct list_head *list) | |
0b224527 RW |
103 | { |
104 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
105 | struct acpi_power_resource_entry *entry; | |
106 | ||
107 | if (!resource || !list) | |
e88c9c60 | 108 | return -EINVAL; |
0b224527 RW |
109 | |
110 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
111 | if (!entry) | |
e88c9c60 | 112 | return -ENOMEM; |
0b224527 RW |
113 | |
114 | entry->resource = resource; | |
115 | if (!list_empty(list)) { | |
116 | struct acpi_power_resource_entry *e; | |
117 | ||
118 | list_for_each_entry(e, list, node) | |
119 | if (e->resource->order > resource->order) { | |
120 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 121 | return 0; |
0b224527 RW |
122 | } |
123 | } | |
124 | list_add_tail(&entry->node, list); | |
e88c9c60 | 125 | return 0; |
0b224527 RW |
126 | } |
127 | ||
128 | void acpi_power_resources_list_free(struct list_head *list) | |
129 | { | |
130 | struct acpi_power_resource_entry *entry, *e; | |
131 | ||
132 | list_for_each_entry_safe(entry, e, list, node) { | |
133 | list_del(&entry->node); | |
134 | kfree(entry); | |
135 | } | |
136 | } | |
137 | ||
e88c9c60 RW |
138 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
139 | struct list_head *list) | |
ef85bdbe | 140 | { |
ef85bdbe | 141 | unsigned int i; |
e88c9c60 | 142 | int err = 0; |
ef85bdbe RW |
143 | |
144 | for (i = start; i < package->package.count; i++) { | |
145 | union acpi_object *element = &package->package.elements[i]; | |
146 | acpi_handle rhandle; | |
147 | ||
148 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 149 | err = -ENODATA; |
ef85bdbe RW |
150 | break; |
151 | } | |
152 | rhandle = element->reference.handle; | |
153 | if (!rhandle) { | |
e88c9c60 | 154 | err = -ENODEV; |
ef85bdbe RW |
155 | break; |
156 | } | |
e88c9c60 RW |
157 | err = acpi_add_power_resource(rhandle); |
158 | if (err) | |
159 | break; | |
160 | ||
161 | err = acpi_power_resources_list_add(rhandle, list); | |
162 | if (err) | |
163 | break; | |
ef85bdbe | 164 | } |
e88c9c60 | 165 | if (err) |
ef85bdbe RW |
166 | acpi_power_resources_list_free(list); |
167 | ||
e88c9c60 | 168 | return err; |
ef85bdbe RW |
169 | } |
170 | ||
a51e145f | 171 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 172 | { |
4be44fcd | 173 | acpi_status status = AE_OK; |
27663c58 | 174 | unsigned long long sta = 0; |
60a4ce7f LM |
175 | char node_name[5]; |
176 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 177 | |
1da177e4 | 178 | |
a51e145f | 179 | if (!handle || !state) |
d550d98d | 180 | return -EINVAL; |
1da177e4 | 181 | |
a51e145f | 182 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 183 | if (ACPI_FAILURE(status)) |
d550d98d | 184 | return -ENODEV; |
1da177e4 | 185 | |
c35923bc AS |
186 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
187 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 188 | |
60a4ce7f LM |
189 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
190 | ||
1da177e4 | 191 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 192 | node_name, |
b1b57fbe | 193 | *state ? "on" : "off")); |
1da177e4 | 194 | |
d550d98d | 195 | return 0; |
1da177e4 LT |
196 | } |
197 | ||
0b224527 | 198 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 199 | { |
0b224527 | 200 | struct acpi_power_resource_entry *entry; |
d0515d9f | 201 | int cur_state; |
1da177e4 LT |
202 | |
203 | if (!list || !state) | |
d550d98d | 204 | return -EINVAL; |
1da177e4 LT |
205 | |
206 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
0b224527 RW |
207 | list_for_each_entry(entry, list, node) { |
208 | struct acpi_power_resource *resource = entry->resource; | |
209 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
210 | int result; |
211 | ||
d0515d9f | 212 | mutex_lock(&resource->resource_lock); |
d0515d9f | 213 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 214 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
215 | if (result) |
216 | return result; | |
217 | ||
218 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
219 | break; |
220 | } | |
221 | ||
222 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 223 | cur_state ? "on" : "off")); |
1da177e4 | 224 | |
d0515d9f | 225 | *state = cur_state; |
d0515d9f | 226 | return 0; |
1da177e4 LT |
227 | } |
228 | ||
3e384ee6 | 229 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 230 | { |
4be44fcd | 231 | acpi_status status = AE_OK; |
1da177e4 | 232 | |
82c7d5ef | 233 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
234 | if (ACPI_FAILURE(status)) |
235 | return -ENODEV; | |
236 | ||
3e384ee6 RW |
237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
238 | resource->name)); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
b5d667eb | 243 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 244 | { |
b5d667eb | 245 | int result = 0; |
0a613902 | 246 | |
3e384ee6 RW |
247 | if (resource->ref_count++) { |
248 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 249 | "Power resource [%s] already on\n", |
3e384ee6 RW |
250 | resource->name)); |
251 | } else { | |
252 | result = __acpi_power_on(resource); | |
41863fce | 253 | if (result) |
12b3b5af | 254 | resource->ref_count--; |
40bf66ec | 255 | } |
b5d667eb RW |
256 | return result; |
257 | } | |
40bf66ec | 258 | |
b5d667eb RW |
259 | static int acpi_power_on(struct acpi_power_resource *resource) |
260 | { | |
261 | int result; | |
40bf66ec | 262 | |
b5d667eb RW |
263 | mutex_lock(&resource->resource_lock); |
264 | result = acpi_power_on_unlocked(resource); | |
265 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 266 | return result; |
1da177e4 LT |
267 | } |
268 | ||
660b1113 RW |
269 | static int __acpi_power_off(struct acpi_power_resource *resource) |
270 | { | |
271 | acpi_status status; | |
272 | ||
273 | status = acpi_evaluate_object(resource->device.handle, "_OFF", | |
274 | NULL, NULL); | |
275 | if (ACPI_FAILURE(status)) | |
276 | return -ENODEV; | |
277 | ||
278 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n", | |
279 | resource->name)); | |
280 | return 0; | |
281 | } | |
282 | ||
b5d667eb | 283 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 284 | { |
0b224527 | 285 | int result = 0; |
1da177e4 | 286 | |
3e384ee6 RW |
287 | if (!resource->ref_count) { |
288 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 289 | "Power resource [%s] already off\n", |
3e384ee6 | 290 | resource->name)); |
b5d667eb | 291 | return 0; |
0a613902 | 292 | } |
1da177e4 | 293 | |
3e384ee6 RW |
294 | if (--resource->ref_count) { |
295 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
296 | "Power resource [%s] still in use\n", | |
297 | resource->name)); | |
660b1113 RW |
298 | } else { |
299 | result = __acpi_power_off(resource); | |
300 | if (result) | |
301 | resource->ref_count++; | |
1da177e4 | 302 | } |
b5d667eb RW |
303 | return result; |
304 | } | |
1da177e4 | 305 | |
b5d667eb RW |
306 | static int acpi_power_off(struct acpi_power_resource *resource) |
307 | { | |
308 | int result; | |
1da177e4 | 309 | |
b5d667eb RW |
310 | mutex_lock(&resource->resource_lock); |
311 | result = acpi_power_off_unlocked(resource); | |
312 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 313 | return result; |
1da177e4 LT |
314 | } |
315 | ||
0b224527 | 316 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 317 | { |
0b224527 RW |
318 | struct acpi_power_resource_entry *entry; |
319 | int result = 0; | |
d2ef555b | 320 | |
0b224527 RW |
321 | list_for_each_entry_reverse(entry, list, node) { |
322 | result = acpi_power_off(entry->resource); | |
323 | if (result) | |
324 | goto err; | |
325 | } | |
326 | return 0; | |
d2ef555b | 327 | |
0b224527 RW |
328 | err: |
329 | list_for_each_entry_continue(entry, list, node) | |
330 | acpi_power_on(entry->resource); | |
331 | ||
332 | return result; | |
d2ef555b RW |
333 | } |
334 | ||
0b224527 | 335 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 336 | { |
0b224527 | 337 | struct acpi_power_resource_entry *entry; |
d2ef555b | 338 | int result = 0; |
d2ef555b | 339 | |
0b224527 RW |
340 | list_for_each_entry(entry, list, node) { |
341 | result = acpi_power_on(entry->resource); | |
342 | if (result) | |
343 | goto err; | |
d2ef555b | 344 | } |
0b224527 RW |
345 | return 0; |
346 | ||
347 | err: | |
348 | list_for_each_entry_continue_reverse(entry, list, node) | |
349 | acpi_power_off(entry->resource); | |
d2ef555b RW |
350 | |
351 | return result; | |
352 | } | |
353 | ||
18a38709 RW |
354 | static struct attribute *attrs[] = { |
355 | NULL, | |
356 | }; | |
357 | ||
358 | static struct attribute_group attr_groups[] = { | |
359 | [ACPI_STATE_D0] = { | |
360 | .name = "power_resources_D0", | |
361 | .attrs = attrs, | |
362 | }, | |
363 | [ACPI_STATE_D1] = { | |
364 | .name = "power_resources_D1", | |
365 | .attrs = attrs, | |
366 | }, | |
367 | [ACPI_STATE_D2] = { | |
368 | .name = "power_resources_D2", | |
369 | .attrs = attrs, | |
370 | }, | |
371 | [ACPI_STATE_D3_HOT] = { | |
372 | .name = "power_resources_D3hot", | |
373 | .attrs = attrs, | |
374 | }, | |
375 | }; | |
376 | ||
41a2a466 RW |
377 | static struct attribute_group wakeup_attr_group = { |
378 | .name = "power_resources_wakeup", | |
379 | .attrs = attrs, | |
380 | }; | |
381 | ||
382 | static void acpi_power_hide_list(struct acpi_device *adev, | |
383 | struct list_head *resources, | |
384 | struct attribute_group *attr_group) | |
18a38709 | 385 | { |
18a38709 RW |
386 | struct acpi_power_resource_entry *entry; |
387 | ||
41a2a466 | 388 | if (list_empty(resources)) |
18a38709 RW |
389 | return; |
390 | ||
41a2a466 | 391 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
392 | struct acpi_device *res_dev = &entry->resource->device; |
393 | ||
394 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 395 | attr_group->name, |
18a38709 RW |
396 | dev_name(&res_dev->dev)); |
397 | } | |
41a2a466 | 398 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
399 | } |
400 | ||
41a2a466 RW |
401 | static void acpi_power_expose_list(struct acpi_device *adev, |
402 | struct list_head *resources, | |
403 | struct attribute_group *attr_group) | |
0090def6 | 404 | { |
18a38709 RW |
405 | struct acpi_power_resource_entry *entry; |
406 | int ret; | |
407 | ||
41a2a466 | 408 | if (list_empty(resources)) |
18a38709 RW |
409 | return; |
410 | ||
41a2a466 | 411 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
412 | if (ret) |
413 | return; | |
414 | ||
41a2a466 | 415 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
416 | struct acpi_device *res_dev = &entry->resource->device; |
417 | ||
418 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 419 | attr_group->name, |
18a38709 RW |
420 | &res_dev->dev.kobj, |
421 | dev_name(&res_dev->dev)); | |
422 | if (ret) { | |
41a2a466 | 423 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 424 | break; |
0090def6 LM |
425 | } |
426 | } | |
0090def6 | 427 | } |
bc9b6407 | 428 | |
41a2a466 RW |
429 | static void acpi_power_expose_hide(struct acpi_device *adev, |
430 | struct list_head *resources, | |
431 | struct attribute_group *attr_group, | |
432 | bool expose) | |
433 | { | |
434 | if (expose) | |
435 | acpi_power_expose_list(adev, resources, attr_group); | |
436 | else | |
437 | acpi_power_hide_list(adev, resources, attr_group); | |
438 | } | |
439 | ||
18a38709 RW |
440 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
441 | { | |
18a38709 RW |
442 | int state; |
443 | ||
41a2a466 RW |
444 | if (adev->wakeup.flags.valid) |
445 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
446 | &wakeup_attr_group, add); | |
447 | ||
18a38709 RW |
448 | if (!adev->power.flags.power_resources) |
449 | return; | |
450 | ||
41a2a466 RW |
451 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
452 | acpi_power_expose_hide(adev, | |
453 | &adev->power.states[state].resources, | |
454 | &attr_groups[state], add); | |
18a38709 RW |
455 | } |
456 | ||
b5d667eb | 457 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
458 | { |
459 | struct acpi_power_resource_entry *entry; | |
460 | int system_level = 5; | |
461 | ||
462 | list_for_each_entry(entry, list, node) { | |
463 | struct acpi_power_resource *resource = entry->resource; | |
b5d667eb RW |
464 | acpi_handle handle = resource->device.handle; |
465 | int result; | |
466 | int state; | |
0596a52b | 467 | |
b5d667eb RW |
468 | mutex_lock(&resource->resource_lock); |
469 | ||
470 | result = acpi_power_get_state(handle, &state); | |
471 | if (result) { | |
472 | mutex_unlock(&resource->resource_lock); | |
473 | return result; | |
474 | } | |
475 | if (state == ACPI_POWER_RESOURCE_STATE_ON) { | |
476 | resource->ref_count++; | |
477 | resource->wakeup_enabled = true; | |
478 | } | |
0596a52b RW |
479 | if (system_level > resource->system_level) |
480 | system_level = resource->system_level; | |
b5d667eb RW |
481 | |
482 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 483 | } |
b5d667eb RW |
484 | *system_level_p = system_level; |
485 | return 0; | |
0596a52b RW |
486 | } |
487 | ||
bc9b6407 RW |
488 | /* -------------------------------------------------------------------------- |
489 | Device Power Management | |
490 | -------------------------------------------------------------------------- */ | |
0090def6 | 491 | |
77e76609 RW |
492 | /** |
493 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
494 | * ACPI 3.0) _PSW (Power State Wake) | |
495 | * @dev: Device to handle. | |
496 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
497 | * @sleep_state: Target sleep state of the system. | |
498 | * @dev_state: Target power state of the device. | |
499 | * | |
500 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
501 | * State Wake) for the device, if present. On failure reset the device's | |
502 | * wakeup.flags.valid flag. | |
503 | * | |
504 | * RETURN VALUE: | |
505 | * 0 if either _DSW or _PSW has been successfully executed | |
506 | * 0 if neither _DSW nor _PSW has been found | |
507 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
508 | */ | |
509 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
510 | int enable, int sleep_state, int dev_state) | |
511 | { | |
512 | union acpi_object in_arg[3]; | |
513 | struct acpi_object_list arg_list = { 3, in_arg }; | |
514 | acpi_status status = AE_OK; | |
515 | ||
516 | /* | |
517 | * Try to execute _DSW first. | |
518 | * | |
519 | * Three agruments are needed for the _DSW object: | |
520 | * Argument 0: enable/disable the wake capabilities | |
521 | * Argument 1: target system state | |
522 | * Argument 2: target device state | |
523 | * When _DSW object is called to disable the wake capabilities, maybe | |
524 | * the first argument is filled. The values of the other two agruments | |
525 | * are meaningless. | |
526 | */ | |
527 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
528 | in_arg[0].integer.value = enable; | |
529 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
530 | in_arg[1].integer.value = sleep_state; | |
531 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
532 | in_arg[2].integer.value = dev_state; | |
533 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
534 | if (ACPI_SUCCESS(status)) { | |
535 | return 0; | |
536 | } else if (status != AE_NOT_FOUND) { | |
537 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
538 | dev->wakeup.flags.valid = 0; | |
539 | return -ENODEV; | |
540 | } | |
541 | ||
542 | /* Execute _PSW */ | |
0db98202 | 543 | status = acpi_execute_simple_method(dev->handle, "_PSW", enable); |
77e76609 RW |
544 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
545 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
546 | dev->wakeup.flags.valid = 0; | |
547 | return -ENODEV; | |
548 | } | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
1da177e4 LT |
553 | /* |
554 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
555 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
556 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
557 | * State Wake) for the device, if present | |
1da177e4 | 558 | */ |
77e76609 | 559 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 560 | { |
b5d667eb | 561 | struct acpi_power_resource_entry *entry; |
993cbe59 | 562 | int err = 0; |
1da177e4 | 563 | |
1da177e4 | 564 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 565 | return -EINVAL; |
1da177e4 | 566 | |
9b83ccd2 RW |
567 | mutex_lock(&acpi_device_lock); |
568 | ||
569 | if (dev->wakeup.prepare_count++) | |
570 | goto out; | |
0af4b8c4 | 571 | |
b5d667eb RW |
572 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
573 | struct acpi_power_resource *resource = entry->resource; | |
574 | ||
575 | mutex_lock(&resource->resource_lock); | |
576 | ||
577 | if (!resource->wakeup_enabled) { | |
578 | err = acpi_power_on_unlocked(resource); | |
579 | if (!err) | |
580 | resource->wakeup_enabled = true; | |
581 | } | |
582 | ||
583 | mutex_unlock(&resource->resource_lock); | |
584 | ||
585 | if (err) { | |
586 | dev_err(&dev->dev, | |
587 | "Cannot turn wakeup power resources on\n"); | |
588 | dev->wakeup.flags.valid = 0; | |
589 | goto out; | |
590 | } | |
1da177e4 | 591 | } |
b5d667eb RW |
592 | /* |
593 | * Passing 3 as the third argument below means the device may be | |
594 | * put into arbitrary power state afterward. | |
595 | */ | |
596 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
9b83ccd2 RW |
597 | if (err) |
598 | dev->wakeup.prepare_count = 0; | |
599 | ||
600 | out: | |
601 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 602 | return err; |
1da177e4 LT |
603 | } |
604 | ||
605 | /* | |
606 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
607 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
608 | * State Wake) for the device, if present | |
1da177e4 LT |
609 | * 2. Shutdown down the power resources |
610 | */ | |
4be44fcd | 611 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 612 | { |
b5d667eb | 613 | struct acpi_power_resource_entry *entry; |
993cbe59 | 614 | int err = 0; |
1da177e4 LT |
615 | |
616 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 617 | return -EINVAL; |
1da177e4 | 618 | |
9b83ccd2 RW |
619 | mutex_lock(&acpi_device_lock); |
620 | ||
621 | if (--dev->wakeup.prepare_count > 0) | |
622 | goto out; | |
623 | ||
0af4b8c4 | 624 | /* |
9b83ccd2 RW |
625 | * Executing the code below even if prepare_count is already zero when |
626 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 627 | */ |
9b83ccd2 RW |
628 | if (dev->wakeup.prepare_count < 0) |
629 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 630 | |
9b83ccd2 RW |
631 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
632 | if (err) | |
633 | goto out; | |
1da177e4 | 634 | |
b5d667eb RW |
635 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
636 | struct acpi_power_resource *resource = entry->resource; | |
637 | ||
638 | mutex_lock(&resource->resource_lock); | |
639 | ||
640 | if (resource->wakeup_enabled) { | |
641 | err = acpi_power_off_unlocked(resource); | |
642 | if (!err) | |
643 | resource->wakeup_enabled = false; | |
644 | } | |
645 | ||
646 | mutex_unlock(&resource->resource_lock); | |
647 | ||
648 | if (err) { | |
649 | dev_err(&dev->dev, | |
650 | "Cannot turn wakeup power resources off\n"); | |
651 | dev->wakeup.flags.valid = 0; | |
652 | break; | |
653 | } | |
1da177e4 LT |
654 | } |
655 | ||
9b83ccd2 RW |
656 | out: |
657 | mutex_unlock(&acpi_device_lock); | |
658 | return err; | |
1da177e4 LT |
659 | } |
660 | ||
32a00d27 | 661 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 662 | { |
4be44fcd | 663 | int result = 0; |
4be44fcd LB |
664 | int list_state = 0; |
665 | int i = 0; | |
1da177e4 | 666 | |
32a00d27 | 667 | if (!device || !state) |
d550d98d | 668 | return -EINVAL; |
1da177e4 | 669 | |
1da177e4 LT |
670 | /* |
671 | * We know a device's inferred power state when all the resources | |
672 | * required for a given D-state are 'on'. | |
673 | */ | |
38c92fff | 674 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
675 | struct list_head *list = &device->power.states[i].resources; |
676 | ||
677 | if (list_empty(list)) | |
1da177e4 LT |
678 | continue; |
679 | ||
680 | result = acpi_power_get_list_state(list, &list_state); | |
681 | if (result) | |
d550d98d | 682 | return result; |
1da177e4 LT |
683 | |
684 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 685 | *state = i; |
d550d98d | 686 | return 0; |
1da177e4 LT |
687 | } |
688 | } | |
689 | ||
8ad928d5 | 690 | *state = ACPI_STATE_D3_COLD; |
d550d98d | 691 | return 0; |
1da177e4 LT |
692 | } |
693 | ||
30d3df41 RW |
694 | int acpi_power_on_resources(struct acpi_device *device, int state) |
695 | { | |
87e753b0 | 696 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
697 | return -EINVAL; |
698 | ||
699 | return acpi_power_on_list(&device->power.states[state].resources); | |
700 | } | |
701 | ||
4be44fcd | 702 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 703 | { |
5c7dd710 | 704 | int result = 0; |
1da177e4 | 705 | |
3ebc81b8 | 706 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 707 | return -EINVAL; |
1da177e4 | 708 | |
0b224527 | 709 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
710 | return 0; |
711 | ||
4be44fcd | 712 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 713 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 714 | return -ENODEV; |
1da177e4 | 715 | |
1da177e4 LT |
716 | /* TBD: Resources must be ordered. */ |
717 | ||
718 | /* | |
719 | * First we reference all power resources required in the target list | |
d2ef555b RW |
720 | * (e.g. so the device doesn't lose power while transitioning). Then, |
721 | * we dereference all power resources used in the current list. | |
1da177e4 | 722 | */ |
5c7dd710 RW |
723 | if (state < ACPI_STATE_D3_COLD) |
724 | result = acpi_power_on_list( | |
725 | &device->power.states[state].resources); | |
726 | ||
727 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
728 | acpi_power_off_list( |
729 | &device->power.states[device->power.state].resources); | |
1da177e4 | 730 | |
d2ef555b RW |
731 | /* We shouldn't change the state unless the above operations succeed. */ |
732 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 733 | |
d550d98d | 734 | return result; |
1da177e4 LT |
735 | } |
736 | ||
82c7d5ef RW |
737 | static void acpi_release_power_resource(struct device *dev) |
738 | { | |
739 | struct acpi_device *device = to_acpi_device(dev); | |
740 | struct acpi_power_resource *resource; | |
741 | ||
82c7d5ef | 742 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
743 | |
744 | mutex_lock(&power_resource_list_lock); | |
745 | list_del(&resource->list_node); | |
746 | mutex_unlock(&power_resource_list_lock); | |
747 | ||
c0af4175 | 748 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
749 | kfree(resource); |
750 | } | |
1da177e4 | 751 | |
b1c0f99b RW |
752 | static ssize_t acpi_power_in_use_show(struct device *dev, |
753 | struct device_attribute *attr, | |
754 | char *buf) { | |
755 | struct acpi_power_resource *resource; | |
756 | ||
757 | resource = to_power_resource(to_acpi_device(dev)); | |
758 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
759 | } | |
760 | static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL); | |
761 | ||
762 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
763 | { | |
764 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
765 | } | |
766 | ||
e88c9c60 | 767 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 768 | { |
82c7d5ef RW |
769 | struct acpi_power_resource *resource; |
770 | struct acpi_device *device = NULL; | |
4be44fcd LB |
771 | union acpi_object acpi_object; |
772 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
773 | acpi_status status; |
774 | int state, result = -ENODEV; | |
1da177e4 | 775 | |
82c7d5ef RW |
776 | acpi_bus_get_device(handle, &device); |
777 | if (device) | |
e88c9c60 | 778 | return 0; |
1da177e4 | 779 | |
82c7d5ef | 780 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 781 | if (!resource) |
e88c9c60 | 782 | return -ENOMEM; |
1da177e4 | 783 | |
82c7d5ef RW |
784 | device = &resource->device; |
785 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
786 | ACPI_STA_DEFAULT); | |
0a613902 | 787 | mutex_init(&resource->resource_lock); |
6ee22e9d | 788 | INIT_LIST_HEAD(&resource->list_node); |
82c7d5ef | 789 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
790 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
791 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 792 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
793 | |
794 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
795 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
796 | if (ACPI_FAILURE(status)) | |
781d737c | 797 | goto err; |
82c7d5ef | 798 | |
1da177e4 LT |
799 | resource->system_level = acpi_object.power_resource.system_level; |
800 | resource->order = acpi_object.power_resource.resource_order; | |
801 | ||
82c7d5ef | 802 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 803 | if (result) |
781d737c | 804 | goto err; |
1da177e4 | 805 | |
1da177e4 | 806 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 807 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 808 | |
82c7d5ef | 809 | device->flags.match_driver = true; |
cf860be6 | 810 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 811 | if (result) |
781d737c | 812 | goto err; |
4be44fcd | 813 | |
b1c0f99b RW |
814 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
815 | device->remove = acpi_power_sysfs_remove; | |
816 | ||
781d737c RW |
817 | mutex_lock(&power_resource_list_lock); |
818 | list_add(&resource->list_node, &acpi_power_resource_list); | |
819 | mutex_unlock(&power_resource_list_lock); | |
cf860be6 | 820 | acpi_device_add_finalize(device); |
e88c9c60 | 821 | return 0; |
1da177e4 | 822 | |
781d737c RW |
823 | err: |
824 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 825 | return result; |
781d737c | 826 | } |
1da177e4 | 827 | |
781d737c RW |
828 | #ifdef CONFIG_ACPI_SLEEP |
829 | void acpi_resume_power_resources(void) | |
0a613902 | 830 | { |
3e384ee6 | 831 | struct acpi_power_resource *resource; |
0a613902 | 832 | |
781d737c | 833 | mutex_lock(&power_resource_list_lock); |
0a613902 | 834 | |
781d737c RW |
835 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
836 | int result, state; | |
0a613902 | 837 | |
781d737c | 838 | mutex_lock(&resource->resource_lock); |
0a613902 | 839 | |
781d737c | 840 | result = acpi_power_get_state(resource->device.handle, &state); |
d7d49012 LT |
841 | if (result) { |
842 | mutex_unlock(&resource->resource_lock); | |
660b1113 | 843 | continue; |
d7d49012 | 844 | } |
660b1113 RW |
845 | |
846 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c RW |
847 | && resource->ref_count) { |
848 | dev_info(&resource->device.dev, "Turning ON\n"); | |
849 | __acpi_power_on(resource); | |
660b1113 RW |
850 | } else if (state == ACPI_POWER_RESOURCE_STATE_ON |
851 | && !resource->ref_count) { | |
852 | dev_info(&resource->device.dev, "Turning OFF\n"); | |
853 | __acpi_power_off(resource); | |
781d737c | 854 | } |
0a613902 | 855 | |
781d737c RW |
856 | mutex_unlock(&resource->resource_lock); |
857 | } | |
3e384ee6 | 858 | |
781d737c | 859 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 860 | } |
90692404 | 861 | #endif |