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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> |
8b48463f | 45 | #include <linux/acpi.h> |
9b83ccd2 | 46 | #include "sleep.h" |
0090def6 | 47 | #include "internal.h" |
9b83ccd2 | 48 | |
a192a958 LB |
49 | #define PREFIX "ACPI: " |
50 | ||
89595b8f | 51 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 52 | ACPI_MODULE_NAME("power"); |
1da177e4 | 53 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 LT |
54 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
55 | #define ACPI_POWER_FILE_INFO "info" | |
56 | #define ACPI_POWER_FILE_STATUS "state" | |
57 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
58 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
59 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 60 | |
4be44fcd | 61 | struct acpi_power_resource { |
82c7d5ef | 62 | struct acpi_device device; |
781d737c | 63 | struct list_head list_node; |
82c7d5ef | 64 | char *name; |
4be44fcd LB |
65 | u32 system_level; |
66 | u32 order; | |
3e384ee6 | 67 | unsigned int ref_count; |
b5d667eb | 68 | bool wakeup_enabled; |
0a613902 | 69 | struct mutex resource_lock; |
1da177e4 LT |
70 | }; |
71 | ||
0b224527 RW |
72 | struct acpi_power_resource_entry { |
73 | struct list_head node; | |
74 | struct acpi_power_resource *resource; | |
75 | }; | |
76 | ||
781d737c RW |
77 | static LIST_HEAD(acpi_power_resource_list); |
78 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 79 | |
1da177e4 LT |
80 | /* -------------------------------------------------------------------------- |
81 | Power Resource Management | |
82 | -------------------------------------------------------------------------- */ | |
83 | ||
b1c0f99b RW |
84 | static inline |
85 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
86 | { | |
87 | return container_of(device, struct acpi_power_resource, device); | |
88 | } | |
89 | ||
82c7d5ef | 90 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 91 | { |
82c7d5ef | 92 | struct acpi_device *device; |
1da177e4 | 93 | |
82c7d5ef RW |
94 | if (acpi_bus_get_device(handle, &device)) |
95 | return NULL; | |
1da177e4 | 96 | |
b1c0f99b | 97 | return to_power_resource(device); |
1da177e4 LT |
98 | } |
99 | ||
e88c9c60 RW |
100 | static int acpi_power_resources_list_add(acpi_handle handle, |
101 | struct list_head *list) | |
0b224527 RW |
102 | { |
103 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
104 | struct acpi_power_resource_entry *entry; | |
105 | ||
106 | if (!resource || !list) | |
e88c9c60 | 107 | return -EINVAL; |
0b224527 RW |
108 | |
109 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
110 | if (!entry) | |
e88c9c60 | 111 | return -ENOMEM; |
0b224527 RW |
112 | |
113 | entry->resource = resource; | |
114 | if (!list_empty(list)) { | |
115 | struct acpi_power_resource_entry *e; | |
116 | ||
117 | list_for_each_entry(e, list, node) | |
118 | if (e->resource->order > resource->order) { | |
119 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 120 | return 0; |
0b224527 RW |
121 | } |
122 | } | |
123 | list_add_tail(&entry->node, list); | |
e88c9c60 | 124 | return 0; |
0b224527 RW |
125 | } |
126 | ||
127 | void acpi_power_resources_list_free(struct list_head *list) | |
128 | { | |
129 | struct acpi_power_resource_entry *entry, *e; | |
130 | ||
131 | list_for_each_entry_safe(entry, e, list, node) { | |
132 | list_del(&entry->node); | |
133 | kfree(entry); | |
134 | } | |
135 | } | |
136 | ||
e88c9c60 RW |
137 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
138 | struct list_head *list) | |
ef85bdbe | 139 | { |
ef85bdbe | 140 | unsigned int i; |
e88c9c60 | 141 | int err = 0; |
ef85bdbe RW |
142 | |
143 | for (i = start; i < package->package.count; i++) { | |
144 | union acpi_object *element = &package->package.elements[i]; | |
145 | acpi_handle rhandle; | |
146 | ||
147 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 148 | err = -ENODATA; |
ef85bdbe RW |
149 | break; |
150 | } | |
151 | rhandle = element->reference.handle; | |
152 | if (!rhandle) { | |
e88c9c60 | 153 | err = -ENODEV; |
ef85bdbe RW |
154 | break; |
155 | } | |
e88c9c60 RW |
156 | err = acpi_add_power_resource(rhandle); |
157 | if (err) | |
158 | break; | |
159 | ||
160 | err = acpi_power_resources_list_add(rhandle, list); | |
161 | if (err) | |
162 | break; | |
ef85bdbe | 163 | } |
e88c9c60 | 164 | if (err) |
ef85bdbe RW |
165 | acpi_power_resources_list_free(list); |
166 | ||
e88c9c60 | 167 | return err; |
ef85bdbe RW |
168 | } |
169 | ||
a51e145f | 170 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 171 | { |
4be44fcd | 172 | acpi_status status = AE_OK; |
27663c58 | 173 | unsigned long long sta = 0; |
60a4ce7f LM |
174 | char node_name[5]; |
175 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 176 | |
1da177e4 | 177 | |
a51e145f | 178 | if (!handle || !state) |
d550d98d | 179 | return -EINVAL; |
1da177e4 | 180 | |
a51e145f | 181 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 182 | if (ACPI_FAILURE(status)) |
d550d98d | 183 | return -ENODEV; |
1da177e4 | 184 | |
c35923bc AS |
185 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
186 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 187 | |
60a4ce7f LM |
188 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
189 | ||
1da177e4 | 190 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 191 | node_name, |
b1b57fbe | 192 | *state ? "on" : "off")); |
1da177e4 | 193 | |
d550d98d | 194 | return 0; |
1da177e4 LT |
195 | } |
196 | ||
0b224527 | 197 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 198 | { |
0b224527 | 199 | struct acpi_power_resource_entry *entry; |
d0515d9f | 200 | int cur_state; |
1da177e4 LT |
201 | |
202 | if (!list || !state) | |
d550d98d | 203 | return -EINVAL; |
1da177e4 LT |
204 | |
205 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
0b224527 RW |
206 | list_for_each_entry(entry, list, node) { |
207 | struct acpi_power_resource *resource = entry->resource; | |
208 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
209 | int result; |
210 | ||
d0515d9f | 211 | mutex_lock(&resource->resource_lock); |
d0515d9f | 212 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 213 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
214 | if (result) |
215 | return result; | |
216 | ||
217 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
218 | break; |
219 | } | |
220 | ||
221 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 222 | cur_state ? "on" : "off")); |
1da177e4 | 223 | |
d0515d9f | 224 | *state = cur_state; |
d0515d9f | 225 | return 0; |
1da177e4 LT |
226 | } |
227 | ||
3e384ee6 | 228 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 229 | { |
4be44fcd | 230 | acpi_status status = AE_OK; |
1da177e4 | 231 | |
82c7d5ef | 232 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
233 | if (ACPI_FAILURE(status)) |
234 | return -ENODEV; | |
235 | ||
3e384ee6 RW |
236 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
237 | resource->name)); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
b5d667eb | 242 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 243 | { |
b5d667eb | 244 | int result = 0; |
0a613902 | 245 | |
3e384ee6 RW |
246 | if (resource->ref_count++) { |
247 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 248 | "Power resource [%s] already on\n", |
3e384ee6 RW |
249 | resource->name)); |
250 | } else { | |
251 | result = __acpi_power_on(resource); | |
41863fce | 252 | if (result) |
12b3b5af | 253 | resource->ref_count--; |
40bf66ec | 254 | } |
b5d667eb RW |
255 | return result; |
256 | } | |
40bf66ec | 257 | |
b5d667eb RW |
258 | static int acpi_power_on(struct acpi_power_resource *resource) |
259 | { | |
260 | int result; | |
40bf66ec | 261 | |
b5d667eb RW |
262 | mutex_lock(&resource->resource_lock); |
263 | result = acpi_power_on_unlocked(resource); | |
264 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 265 | return result; |
1da177e4 LT |
266 | } |
267 | ||
660b1113 RW |
268 | static int __acpi_power_off(struct acpi_power_resource *resource) |
269 | { | |
270 | acpi_status status; | |
271 | ||
272 | status = acpi_evaluate_object(resource->device.handle, "_OFF", | |
273 | NULL, NULL); | |
274 | if (ACPI_FAILURE(status)) | |
275 | return -ENODEV; | |
276 | ||
277 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n", | |
278 | resource->name)); | |
279 | return 0; | |
280 | } | |
281 | ||
b5d667eb | 282 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 283 | { |
0b224527 | 284 | int result = 0; |
1da177e4 | 285 | |
3e384ee6 RW |
286 | if (!resource->ref_count) { |
287 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 288 | "Power resource [%s] already off\n", |
3e384ee6 | 289 | resource->name)); |
b5d667eb | 290 | return 0; |
0a613902 | 291 | } |
1da177e4 | 292 | |
3e384ee6 RW |
293 | if (--resource->ref_count) { |
294 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
295 | "Power resource [%s] still in use\n", | |
296 | resource->name)); | |
660b1113 RW |
297 | } else { |
298 | result = __acpi_power_off(resource); | |
299 | if (result) | |
300 | resource->ref_count++; | |
1da177e4 | 301 | } |
b5d667eb RW |
302 | return result; |
303 | } | |
1da177e4 | 304 | |
b5d667eb RW |
305 | static int acpi_power_off(struct acpi_power_resource *resource) |
306 | { | |
307 | int result; | |
1da177e4 | 308 | |
b5d667eb RW |
309 | mutex_lock(&resource->resource_lock); |
310 | result = acpi_power_off_unlocked(resource); | |
311 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 312 | return result; |
1da177e4 LT |
313 | } |
314 | ||
0b224527 | 315 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 316 | { |
0b224527 RW |
317 | struct acpi_power_resource_entry *entry; |
318 | int result = 0; | |
d2ef555b | 319 | |
0b224527 RW |
320 | list_for_each_entry_reverse(entry, list, node) { |
321 | result = acpi_power_off(entry->resource); | |
322 | if (result) | |
323 | goto err; | |
324 | } | |
325 | return 0; | |
d2ef555b | 326 | |
0b224527 RW |
327 | err: |
328 | list_for_each_entry_continue(entry, list, node) | |
329 | acpi_power_on(entry->resource); | |
330 | ||
331 | return result; | |
d2ef555b RW |
332 | } |
333 | ||
0b224527 | 334 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 335 | { |
0b224527 | 336 | struct acpi_power_resource_entry *entry; |
d2ef555b | 337 | int result = 0; |
d2ef555b | 338 | |
0b224527 RW |
339 | list_for_each_entry(entry, list, node) { |
340 | result = acpi_power_on(entry->resource); | |
341 | if (result) | |
342 | goto err; | |
d2ef555b | 343 | } |
0b224527 RW |
344 | return 0; |
345 | ||
346 | err: | |
347 | list_for_each_entry_continue_reverse(entry, list, node) | |
348 | acpi_power_off(entry->resource); | |
d2ef555b RW |
349 | |
350 | return result; | |
351 | } | |
352 | ||
18a38709 RW |
353 | static struct attribute *attrs[] = { |
354 | NULL, | |
355 | }; | |
356 | ||
357 | static struct attribute_group attr_groups[] = { | |
358 | [ACPI_STATE_D0] = { | |
359 | .name = "power_resources_D0", | |
360 | .attrs = attrs, | |
361 | }, | |
362 | [ACPI_STATE_D1] = { | |
363 | .name = "power_resources_D1", | |
364 | .attrs = attrs, | |
365 | }, | |
366 | [ACPI_STATE_D2] = { | |
367 | .name = "power_resources_D2", | |
368 | .attrs = attrs, | |
369 | }, | |
370 | [ACPI_STATE_D3_HOT] = { | |
371 | .name = "power_resources_D3hot", | |
372 | .attrs = attrs, | |
373 | }, | |
374 | }; | |
375 | ||
41a2a466 RW |
376 | static struct attribute_group wakeup_attr_group = { |
377 | .name = "power_resources_wakeup", | |
378 | .attrs = attrs, | |
379 | }; | |
380 | ||
381 | static void acpi_power_hide_list(struct acpi_device *adev, | |
382 | struct list_head *resources, | |
383 | struct attribute_group *attr_group) | |
18a38709 | 384 | { |
18a38709 RW |
385 | struct acpi_power_resource_entry *entry; |
386 | ||
41a2a466 | 387 | if (list_empty(resources)) |
18a38709 RW |
388 | return; |
389 | ||
41a2a466 | 390 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
391 | struct acpi_device *res_dev = &entry->resource->device; |
392 | ||
393 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 394 | attr_group->name, |
18a38709 RW |
395 | dev_name(&res_dev->dev)); |
396 | } | |
41a2a466 | 397 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
398 | } |
399 | ||
41a2a466 RW |
400 | static void acpi_power_expose_list(struct acpi_device *adev, |
401 | struct list_head *resources, | |
402 | struct attribute_group *attr_group) | |
0090def6 | 403 | { |
18a38709 RW |
404 | struct acpi_power_resource_entry *entry; |
405 | int ret; | |
406 | ||
41a2a466 | 407 | if (list_empty(resources)) |
18a38709 RW |
408 | return; |
409 | ||
41a2a466 | 410 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
411 | if (ret) |
412 | return; | |
413 | ||
41a2a466 | 414 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
415 | struct acpi_device *res_dev = &entry->resource->device; |
416 | ||
417 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 418 | attr_group->name, |
18a38709 RW |
419 | &res_dev->dev.kobj, |
420 | dev_name(&res_dev->dev)); | |
421 | if (ret) { | |
41a2a466 | 422 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 423 | break; |
0090def6 LM |
424 | } |
425 | } | |
0090def6 | 426 | } |
bc9b6407 | 427 | |
41a2a466 RW |
428 | static void acpi_power_expose_hide(struct acpi_device *adev, |
429 | struct list_head *resources, | |
430 | struct attribute_group *attr_group, | |
431 | bool expose) | |
432 | { | |
433 | if (expose) | |
434 | acpi_power_expose_list(adev, resources, attr_group); | |
435 | else | |
436 | acpi_power_hide_list(adev, resources, attr_group); | |
437 | } | |
438 | ||
18a38709 RW |
439 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
440 | { | |
18a38709 RW |
441 | int state; |
442 | ||
41a2a466 RW |
443 | if (adev->wakeup.flags.valid) |
444 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
445 | &wakeup_attr_group, add); | |
446 | ||
18a38709 RW |
447 | if (!adev->power.flags.power_resources) |
448 | return; | |
449 | ||
41a2a466 RW |
450 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
451 | acpi_power_expose_hide(adev, | |
452 | &adev->power.states[state].resources, | |
453 | &attr_groups[state], add); | |
18a38709 RW |
454 | } |
455 | ||
b5d667eb | 456 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
457 | { |
458 | struct acpi_power_resource_entry *entry; | |
459 | int system_level = 5; | |
460 | ||
461 | list_for_each_entry(entry, list, node) { | |
462 | struct acpi_power_resource *resource = entry->resource; | |
b5d667eb RW |
463 | acpi_handle handle = resource->device.handle; |
464 | int result; | |
465 | int state; | |
0596a52b | 466 | |
b5d667eb RW |
467 | mutex_lock(&resource->resource_lock); |
468 | ||
469 | result = acpi_power_get_state(handle, &state); | |
470 | if (result) { | |
471 | mutex_unlock(&resource->resource_lock); | |
472 | return result; | |
473 | } | |
474 | if (state == ACPI_POWER_RESOURCE_STATE_ON) { | |
475 | resource->ref_count++; | |
476 | resource->wakeup_enabled = true; | |
477 | } | |
0596a52b RW |
478 | if (system_level > resource->system_level) |
479 | system_level = resource->system_level; | |
b5d667eb RW |
480 | |
481 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 482 | } |
b5d667eb RW |
483 | *system_level_p = system_level; |
484 | return 0; | |
0596a52b RW |
485 | } |
486 | ||
bc9b6407 RW |
487 | /* -------------------------------------------------------------------------- |
488 | Device Power Management | |
489 | -------------------------------------------------------------------------- */ | |
0090def6 | 490 | |
77e76609 RW |
491 | /** |
492 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
493 | * ACPI 3.0) _PSW (Power State Wake) | |
494 | * @dev: Device to handle. | |
495 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
496 | * @sleep_state: Target sleep state of the system. | |
497 | * @dev_state: Target power state of the device. | |
498 | * | |
499 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
500 | * State Wake) for the device, if present. On failure reset the device's | |
501 | * wakeup.flags.valid flag. | |
502 | * | |
503 | * RETURN VALUE: | |
504 | * 0 if either _DSW or _PSW has been successfully executed | |
505 | * 0 if neither _DSW nor _PSW has been found | |
506 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
507 | */ | |
508 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
509 | int enable, int sleep_state, int dev_state) | |
510 | { | |
511 | union acpi_object in_arg[3]; | |
512 | struct acpi_object_list arg_list = { 3, in_arg }; | |
513 | acpi_status status = AE_OK; | |
514 | ||
515 | /* | |
516 | * Try to execute _DSW first. | |
517 | * | |
518 | * Three agruments are needed for the _DSW object: | |
519 | * Argument 0: enable/disable the wake capabilities | |
520 | * Argument 1: target system state | |
521 | * Argument 2: target device state | |
522 | * When _DSW object is called to disable the wake capabilities, maybe | |
523 | * the first argument is filled. The values of the other two agruments | |
524 | * are meaningless. | |
525 | */ | |
526 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
527 | in_arg[0].integer.value = enable; | |
528 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
529 | in_arg[1].integer.value = sleep_state; | |
530 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
531 | in_arg[2].integer.value = dev_state; | |
532 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
533 | if (ACPI_SUCCESS(status)) { | |
534 | return 0; | |
535 | } else if (status != AE_NOT_FOUND) { | |
536 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
537 | dev->wakeup.flags.valid = 0; | |
538 | return -ENODEV; | |
539 | } | |
540 | ||
541 | /* Execute _PSW */ | |
0db98202 | 542 | status = acpi_execute_simple_method(dev->handle, "_PSW", enable); |
77e76609 RW |
543 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { |
544 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
545 | dev->wakeup.flags.valid = 0; | |
546 | return -ENODEV; | |
547 | } | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
1da177e4 LT |
552 | /* |
553 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
554 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
555 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
556 | * State Wake) for the device, if present | |
1da177e4 | 557 | */ |
77e76609 | 558 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 559 | { |
b5d667eb | 560 | struct acpi_power_resource_entry *entry; |
993cbe59 | 561 | int err = 0; |
1da177e4 | 562 | |
1da177e4 | 563 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 564 | return -EINVAL; |
1da177e4 | 565 | |
9b83ccd2 RW |
566 | mutex_lock(&acpi_device_lock); |
567 | ||
568 | if (dev->wakeup.prepare_count++) | |
569 | goto out; | |
0af4b8c4 | 570 | |
b5d667eb RW |
571 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
572 | struct acpi_power_resource *resource = entry->resource; | |
573 | ||
574 | mutex_lock(&resource->resource_lock); | |
575 | ||
576 | if (!resource->wakeup_enabled) { | |
577 | err = acpi_power_on_unlocked(resource); | |
578 | if (!err) | |
579 | resource->wakeup_enabled = true; | |
580 | } | |
581 | ||
582 | mutex_unlock(&resource->resource_lock); | |
583 | ||
584 | if (err) { | |
585 | dev_err(&dev->dev, | |
586 | "Cannot turn wakeup power resources on\n"); | |
587 | dev->wakeup.flags.valid = 0; | |
588 | goto out; | |
589 | } | |
1da177e4 | 590 | } |
b5d667eb RW |
591 | /* |
592 | * Passing 3 as the third argument below means the device may be | |
593 | * put into arbitrary power state afterward. | |
594 | */ | |
595 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
9b83ccd2 RW |
596 | if (err) |
597 | dev->wakeup.prepare_count = 0; | |
598 | ||
599 | out: | |
600 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 601 | return err; |
1da177e4 LT |
602 | } |
603 | ||
604 | /* | |
605 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
606 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
607 | * State Wake) for the device, if present | |
1da177e4 LT |
608 | * 2. Shutdown down the power resources |
609 | */ | |
4be44fcd | 610 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 611 | { |
b5d667eb | 612 | struct acpi_power_resource_entry *entry; |
993cbe59 | 613 | int err = 0; |
1da177e4 LT |
614 | |
615 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 616 | return -EINVAL; |
1da177e4 | 617 | |
9b83ccd2 RW |
618 | mutex_lock(&acpi_device_lock); |
619 | ||
620 | if (--dev->wakeup.prepare_count > 0) | |
621 | goto out; | |
622 | ||
0af4b8c4 | 623 | /* |
9b83ccd2 RW |
624 | * Executing the code below even if prepare_count is already zero when |
625 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 626 | */ |
9b83ccd2 RW |
627 | if (dev->wakeup.prepare_count < 0) |
628 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 629 | |
9b83ccd2 RW |
630 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
631 | if (err) | |
632 | goto out; | |
1da177e4 | 633 | |
b5d667eb RW |
634 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
635 | struct acpi_power_resource *resource = entry->resource; | |
636 | ||
637 | mutex_lock(&resource->resource_lock); | |
638 | ||
639 | if (resource->wakeup_enabled) { | |
640 | err = acpi_power_off_unlocked(resource); | |
641 | if (!err) | |
642 | resource->wakeup_enabled = false; | |
643 | } | |
644 | ||
645 | mutex_unlock(&resource->resource_lock); | |
646 | ||
647 | if (err) { | |
648 | dev_err(&dev->dev, | |
649 | "Cannot turn wakeup power resources off\n"); | |
650 | dev->wakeup.flags.valid = 0; | |
651 | break; | |
652 | } | |
1da177e4 LT |
653 | } |
654 | ||
9b83ccd2 RW |
655 | out: |
656 | mutex_unlock(&acpi_device_lock); | |
657 | return err; | |
1da177e4 LT |
658 | } |
659 | ||
32a00d27 | 660 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 661 | { |
4be44fcd | 662 | int result = 0; |
4be44fcd LB |
663 | int list_state = 0; |
664 | int i = 0; | |
1da177e4 | 665 | |
32a00d27 | 666 | if (!device || !state) |
d550d98d | 667 | return -EINVAL; |
1da177e4 | 668 | |
1da177e4 LT |
669 | /* |
670 | * We know a device's inferred power state when all the resources | |
671 | * required for a given D-state are 'on'. | |
672 | */ | |
38c92fff | 673 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
674 | struct list_head *list = &device->power.states[i].resources; |
675 | ||
676 | if (list_empty(list)) | |
1da177e4 LT |
677 | continue; |
678 | ||
679 | result = acpi_power_get_list_state(list, &list_state); | |
680 | if (result) | |
d550d98d | 681 | return result; |
1da177e4 LT |
682 | |
683 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 684 | *state = i; |
d550d98d | 685 | return 0; |
1da177e4 LT |
686 | } |
687 | } | |
688 | ||
8ad928d5 | 689 | *state = ACPI_STATE_D3_COLD; |
d550d98d | 690 | return 0; |
1da177e4 LT |
691 | } |
692 | ||
30d3df41 RW |
693 | int acpi_power_on_resources(struct acpi_device *device, int state) |
694 | { | |
87e753b0 | 695 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
696 | return -EINVAL; |
697 | ||
698 | return acpi_power_on_list(&device->power.states[state].resources); | |
699 | } | |
700 | ||
4be44fcd | 701 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 702 | { |
5c7dd710 | 703 | int result = 0; |
1da177e4 | 704 | |
3ebc81b8 | 705 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 706 | return -EINVAL; |
1da177e4 | 707 | |
0b224527 | 708 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
709 | return 0; |
710 | ||
4be44fcd | 711 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 712 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 713 | return -ENODEV; |
1da177e4 | 714 | |
1da177e4 LT |
715 | /* TBD: Resources must be ordered. */ |
716 | ||
717 | /* | |
718 | * First we reference all power resources required in the target list | |
d2ef555b RW |
719 | * (e.g. so the device doesn't lose power while transitioning). Then, |
720 | * we dereference all power resources used in the current list. | |
1da177e4 | 721 | */ |
5c7dd710 RW |
722 | if (state < ACPI_STATE_D3_COLD) |
723 | result = acpi_power_on_list( | |
724 | &device->power.states[state].resources); | |
725 | ||
726 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
727 | acpi_power_off_list( |
728 | &device->power.states[device->power.state].resources); | |
1da177e4 | 729 | |
d2ef555b RW |
730 | /* We shouldn't change the state unless the above operations succeed. */ |
731 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 732 | |
d550d98d | 733 | return result; |
1da177e4 LT |
734 | } |
735 | ||
82c7d5ef RW |
736 | static void acpi_release_power_resource(struct device *dev) |
737 | { | |
738 | struct acpi_device *device = to_acpi_device(dev); | |
739 | struct acpi_power_resource *resource; | |
740 | ||
82c7d5ef | 741 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
742 | |
743 | mutex_lock(&power_resource_list_lock); | |
744 | list_del(&resource->list_node); | |
745 | mutex_unlock(&power_resource_list_lock); | |
746 | ||
c0af4175 | 747 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
748 | kfree(resource); |
749 | } | |
1da177e4 | 750 | |
b1c0f99b RW |
751 | static ssize_t acpi_power_in_use_show(struct device *dev, |
752 | struct device_attribute *attr, | |
753 | char *buf) { | |
754 | struct acpi_power_resource *resource; | |
755 | ||
756 | resource = to_power_resource(to_acpi_device(dev)); | |
757 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
758 | } | |
759 | static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL); | |
760 | ||
761 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
762 | { | |
763 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
764 | } | |
765 | ||
e88c9c60 | 766 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 767 | { |
82c7d5ef RW |
768 | struct acpi_power_resource *resource; |
769 | struct acpi_device *device = NULL; | |
4be44fcd LB |
770 | union acpi_object acpi_object; |
771 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
772 | acpi_status status; |
773 | int state, result = -ENODEV; | |
1da177e4 | 774 | |
82c7d5ef RW |
775 | acpi_bus_get_device(handle, &device); |
776 | if (device) | |
e88c9c60 | 777 | return 0; |
1da177e4 | 778 | |
82c7d5ef | 779 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 780 | if (!resource) |
e88c9c60 | 781 | return -ENOMEM; |
1da177e4 | 782 | |
82c7d5ef RW |
783 | device = &resource->device; |
784 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
785 | ACPI_STA_DEFAULT); | |
0a613902 | 786 | mutex_init(&resource->resource_lock); |
6ee22e9d | 787 | INIT_LIST_HEAD(&resource->list_node); |
82c7d5ef | 788 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
789 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
790 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 791 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
792 | |
793 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
794 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
795 | if (ACPI_FAILURE(status)) | |
781d737c | 796 | goto err; |
82c7d5ef | 797 | |
1da177e4 LT |
798 | resource->system_level = acpi_object.power_resource.system_level; |
799 | resource->order = acpi_object.power_resource.resource_order; | |
800 | ||
82c7d5ef | 801 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 802 | if (result) |
781d737c | 803 | goto err; |
1da177e4 | 804 | |
1da177e4 | 805 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 806 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 807 | |
82c7d5ef | 808 | device->flags.match_driver = true; |
cf860be6 | 809 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 810 | if (result) |
781d737c | 811 | goto err; |
4be44fcd | 812 | |
b1c0f99b RW |
813 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
814 | device->remove = acpi_power_sysfs_remove; | |
815 | ||
781d737c RW |
816 | mutex_lock(&power_resource_list_lock); |
817 | list_add(&resource->list_node, &acpi_power_resource_list); | |
818 | mutex_unlock(&power_resource_list_lock); | |
cf860be6 | 819 | acpi_device_add_finalize(device); |
e88c9c60 | 820 | return 0; |
1da177e4 | 821 | |
781d737c RW |
822 | err: |
823 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 824 | return result; |
781d737c | 825 | } |
1da177e4 | 826 | |
781d737c RW |
827 | #ifdef CONFIG_ACPI_SLEEP |
828 | void acpi_resume_power_resources(void) | |
0a613902 | 829 | { |
3e384ee6 | 830 | struct acpi_power_resource *resource; |
0a613902 | 831 | |
781d737c | 832 | mutex_lock(&power_resource_list_lock); |
0a613902 | 833 | |
781d737c RW |
834 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
835 | int result, state; | |
0a613902 | 836 | |
781d737c | 837 | mutex_lock(&resource->resource_lock); |
0a613902 | 838 | |
781d737c | 839 | result = acpi_power_get_state(resource->device.handle, &state); |
d7d49012 LT |
840 | if (result) { |
841 | mutex_unlock(&resource->resource_lock); | |
660b1113 | 842 | continue; |
d7d49012 | 843 | } |
660b1113 RW |
844 | |
845 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c RW |
846 | && resource->ref_count) { |
847 | dev_info(&resource->device.dev, "Turning ON\n"); | |
848 | __acpi_power_on(resource); | |
660b1113 RW |
849 | } else if (state == ACPI_POWER_RESOURCE_STATE_ON |
850 | && !resource->ref_count) { | |
851 | dev_info(&resource->device.dev, "Turning OFF\n"); | |
852 | __acpi_power_off(resource); | |
781d737c | 853 | } |
0a613902 | 854 | |
781d737c RW |
855 | mutex_unlock(&resource->resource_lock); |
856 | } | |
3e384ee6 | 857 | |
781d737c | 858 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 859 | } |
90692404 | 860 | #endif |