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