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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> |
1da177e4 LT |
44 | #include <acpi/acpi_bus.h> |
45 | #include <acpi/acpi_drivers.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 | |
bc9b6407 RW |
61 | struct acpi_power_dependent_device { |
62 | struct list_head node; | |
63 | struct acpi_device *adev; | |
64 | struct work_struct work; | |
0090def6 LM |
65 | }; |
66 | ||
4be44fcd | 67 | struct acpi_power_resource { |
82c7d5ef | 68 | struct acpi_device device; |
781d737c | 69 | struct list_head list_node; |
bc9b6407 | 70 | struct list_head dependent; |
82c7d5ef | 71 | char *name; |
4be44fcd LB |
72 | u32 system_level; |
73 | u32 order; | |
3e384ee6 | 74 | unsigned int ref_count; |
0a613902 | 75 | struct mutex resource_lock; |
1da177e4 LT |
76 | }; |
77 | ||
0b224527 RW |
78 | struct acpi_power_resource_entry { |
79 | struct list_head node; | |
80 | struct acpi_power_resource *resource; | |
81 | }; | |
82 | ||
781d737c RW |
83 | static LIST_HEAD(acpi_power_resource_list); |
84 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 85 | |
1da177e4 LT |
86 | /* -------------------------------------------------------------------------- |
87 | Power Resource Management | |
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 | |
82c7d5ef | 97 | return container_of(device, struct acpi_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 | ||
bc9b6407 | 228 | static void acpi_power_resume_dependent(struct work_struct *work) |
0090def6 | 229 | { |
bc9b6407 RW |
230 | struct acpi_power_dependent_device *dep; |
231 | struct acpi_device_physical_node *pn; | |
232 | struct acpi_device *adev; | |
0090def6 LM |
233 | int state; |
234 | ||
bc9b6407 RW |
235 | dep = container_of(work, struct acpi_power_dependent_device, work); |
236 | adev = dep->adev; | |
237 | if (acpi_power_get_inferred_state(adev, &state)) | |
0090def6 LM |
238 | return; |
239 | ||
bc9b6407 | 240 | if (state > ACPI_STATE_D0) |
0090def6 LM |
241 | return; |
242 | ||
bc9b6407 RW |
243 | mutex_lock(&adev->physical_node_lock); |
244 | ||
245 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
246 | pm_request_resume(pn->dev); | |
247 | ||
248 | list_for_each_entry(pn, &adev->power_dependent, node) | |
249 | pm_request_resume(pn->dev); | |
250 | ||
251 | mutex_unlock(&adev->physical_node_lock); | |
0090def6 LM |
252 | } |
253 | ||
3e384ee6 | 254 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 255 | { |
4be44fcd | 256 | acpi_status status = AE_OK; |
1da177e4 | 257 | |
82c7d5ef | 258 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
259 | if (ACPI_FAILURE(status)) |
260 | return -ENODEV; | |
261 | ||
3e384ee6 RW |
262 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
263 | resource->name)); | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
0b224527 | 268 | static int acpi_power_on(struct acpi_power_resource *resource) |
3e384ee6 | 269 | { |
0b224527 | 270 | int result = 0;; |
1da177e4 | 271 | |
0a613902 | 272 | mutex_lock(&resource->resource_lock); |
0a613902 | 273 | |
3e384ee6 RW |
274 | if (resource->ref_count++) { |
275 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
276 | "Power resource [%s] already on", | |
277 | resource->name)); | |
278 | } else { | |
279 | result = __acpi_power_on(resource); | |
bc9b6407 | 280 | if (result) { |
12b3b5af | 281 | resource->ref_count--; |
bc9b6407 RW |
282 | } else { |
283 | struct acpi_power_dependent_device *dep; | |
40bf66ec | 284 | |
bc9b6407 RW |
285 | list_for_each_entry(dep, &resource->dependent, node) |
286 | schedule_work(&dep->work); | |
287 | } | |
40bf66ec LM |
288 | } |
289 | ||
bc9b6407 | 290 | mutex_unlock(&resource->resource_lock); |
40bf66ec | 291 | |
12b3b5af | 292 | return result; |
1da177e4 LT |
293 | } |
294 | ||
0b224527 | 295 | static int acpi_power_off(struct acpi_power_resource *resource) |
1da177e4 | 296 | { |
4be44fcd | 297 | acpi_status status = AE_OK; |
0b224527 | 298 | int result = 0; |
1da177e4 | 299 | |
0a613902 | 300 | mutex_lock(&resource->resource_lock); |
3e384ee6 RW |
301 | |
302 | if (!resource->ref_count) { | |
303 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
304 | "Power resource [%s] already off", | |
305 | resource->name)); | |
306 | goto unlock; | |
0a613902 | 307 | } |
1da177e4 | 308 | |
3e384ee6 RW |
309 | if (--resource->ref_count) { |
310 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
311 | "Power resource [%s] still in use\n", | |
312 | resource->name)); | |
313 | goto unlock; | |
1da177e4 LT |
314 | } |
315 | ||
82c7d5ef | 316 | status = acpi_evaluate_object(resource->device.handle, "_OFF", NULL, NULL); |
722c929f | 317 | if (ACPI_FAILURE(status)) |
3e384ee6 | 318 | result = -ENODEV; |
722c929f | 319 | else |
3e384ee6 RW |
320 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
321 | "Power resource [%s] turned off\n", | |
322 | resource->name)); | |
1da177e4 | 323 | |
3e384ee6 RW |
324 | unlock: |
325 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 326 | |
3e384ee6 | 327 | return result; |
1da177e4 LT |
328 | } |
329 | ||
0b224527 | 330 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 331 | { |
0b224527 RW |
332 | struct acpi_power_resource_entry *entry; |
333 | int result = 0; | |
d2ef555b | 334 | |
0b224527 RW |
335 | list_for_each_entry_reverse(entry, list, node) { |
336 | result = acpi_power_off(entry->resource); | |
337 | if (result) | |
338 | goto err; | |
339 | } | |
340 | return 0; | |
d2ef555b | 341 | |
0b224527 RW |
342 | err: |
343 | list_for_each_entry_continue(entry, list, node) | |
344 | acpi_power_on(entry->resource); | |
345 | ||
346 | return result; | |
d2ef555b RW |
347 | } |
348 | ||
0b224527 | 349 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 350 | { |
0b224527 | 351 | struct acpi_power_resource_entry *entry; |
d2ef555b | 352 | int result = 0; |
d2ef555b | 353 | |
0b224527 RW |
354 | list_for_each_entry(entry, list, node) { |
355 | result = acpi_power_on(entry->resource); | |
356 | if (result) | |
357 | goto err; | |
d2ef555b | 358 | } |
0b224527 RW |
359 | return 0; |
360 | ||
361 | err: | |
362 | list_for_each_entry_continue_reverse(entry, list, node) | |
363 | acpi_power_off(entry->resource); | |
d2ef555b RW |
364 | |
365 | return result; | |
366 | } | |
367 | ||
0b224527 | 368 | static void acpi_power_add_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 369 | struct acpi_device *adev) |
0090def6 | 370 | { |
bc9b6407 | 371 | struct acpi_power_dependent_device *dep; |
0090def6 | 372 | |
bc9b6407 | 373 | mutex_lock(&resource->resource_lock); |
0090def6 | 374 | |
bc9b6407 RW |
375 | list_for_each_entry(dep, &resource->dependent, node) |
376 | if (dep->adev == adev) | |
377 | goto out; | |
0090def6 | 378 | |
bc9b6407 RW |
379 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
380 | if (!dep) | |
381 | goto out; | |
0090def6 | 382 | |
bc9b6407 RW |
383 | dep->adev = adev; |
384 | INIT_WORK(&dep->work, acpi_power_resume_dependent); | |
385 | list_add_tail(&dep->node, &resource->dependent); | |
0090def6 | 386 | |
bc9b6407 RW |
387 | out: |
388 | mutex_unlock(&resource->resource_lock); | |
0090def6 LM |
389 | } |
390 | ||
0b224527 | 391 | static void acpi_power_remove_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 392 | struct acpi_device *adev) |
0090def6 | 393 | { |
bc9b6407 | 394 | struct acpi_power_dependent_device *dep; |
bc9b6407 | 395 | struct work_struct *work = NULL; |
0090def6 | 396 | |
bc9b6407 | 397 | mutex_lock(&resource->resource_lock); |
0090def6 | 398 | |
bc9b6407 RW |
399 | list_for_each_entry(dep, &resource->dependent, node) |
400 | if (dep->adev == adev) { | |
401 | list_del(&dep->node); | |
402 | work = &dep->work; | |
403 | break; | |
404 | } | |
0090def6 | 405 | |
bc9b6407 | 406 | mutex_unlock(&resource->resource_lock); |
0090def6 | 407 | |
bc9b6407 RW |
408 | if (work) { |
409 | cancel_work_sync(work); | |
410 | kfree(dep); | |
411 | } | |
0090def6 LM |
412 | } |
413 | ||
bc9b6407 | 414 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
0090def6 | 415 | { |
bc9b6407 RW |
416 | if (adev->power.flags.power_resources) { |
417 | struct acpi_device_power_state *ps; | |
0b224527 | 418 | struct acpi_power_resource_entry *entry; |
0090def6 | 419 | |
bc9b6407 | 420 | ps = &adev->power.states[ACPI_STATE_D0]; |
0b224527 RW |
421 | list_for_each_entry(entry, &ps->resources, node) { |
422 | struct acpi_power_resource *resource = entry->resource; | |
0090def6 | 423 | |
bc9b6407 | 424 | if (add) |
0b224527 | 425 | acpi_power_add_dependent(resource, adev); |
bc9b6407 | 426 | else |
0b224527 | 427 | acpi_power_remove_dependent(resource, adev); |
0090def6 LM |
428 | } |
429 | } | |
0090def6 | 430 | } |
bc9b6407 | 431 | |
0596a52b RW |
432 | int acpi_power_min_system_level(struct list_head *list) |
433 | { | |
434 | struct acpi_power_resource_entry *entry; | |
435 | int system_level = 5; | |
436 | ||
437 | list_for_each_entry(entry, list, node) { | |
438 | struct acpi_power_resource *resource = entry->resource; | |
439 | ||
440 | if (system_level > resource->system_level) | |
441 | system_level = resource->system_level; | |
442 | } | |
443 | return system_level; | |
444 | } | |
445 | ||
bc9b6407 RW |
446 | /* -------------------------------------------------------------------------- |
447 | Device Power Management | |
448 | -------------------------------------------------------------------------- */ | |
0090def6 | 449 | |
77e76609 RW |
450 | /** |
451 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
452 | * ACPI 3.0) _PSW (Power State Wake) | |
453 | * @dev: Device to handle. | |
454 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
455 | * @sleep_state: Target sleep state of the system. | |
456 | * @dev_state: Target power state of the device. | |
457 | * | |
458 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
459 | * State Wake) for the device, if present. On failure reset the device's | |
460 | * wakeup.flags.valid flag. | |
461 | * | |
462 | * RETURN VALUE: | |
463 | * 0 if either _DSW or _PSW has been successfully executed | |
464 | * 0 if neither _DSW nor _PSW has been found | |
465 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
466 | */ | |
467 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
468 | int enable, int sleep_state, int dev_state) | |
469 | { | |
470 | union acpi_object in_arg[3]; | |
471 | struct acpi_object_list arg_list = { 3, in_arg }; | |
472 | acpi_status status = AE_OK; | |
473 | ||
474 | /* | |
475 | * Try to execute _DSW first. | |
476 | * | |
477 | * Three agruments are needed for the _DSW object: | |
478 | * Argument 0: enable/disable the wake capabilities | |
479 | * Argument 1: target system state | |
480 | * Argument 2: target device state | |
481 | * When _DSW object is called to disable the wake capabilities, maybe | |
482 | * the first argument is filled. The values of the other two agruments | |
483 | * are meaningless. | |
484 | */ | |
485 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
486 | in_arg[0].integer.value = enable; | |
487 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
488 | in_arg[1].integer.value = sleep_state; | |
489 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
490 | in_arg[2].integer.value = dev_state; | |
491 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
492 | if (ACPI_SUCCESS(status)) { | |
493 | return 0; | |
494 | } else if (status != AE_NOT_FOUND) { | |
495 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
496 | dev->wakeup.flags.valid = 0; | |
497 | return -ENODEV; | |
498 | } | |
499 | ||
500 | /* Execute _PSW */ | |
501 | arg_list.count = 1; | |
502 | in_arg[0].integer.value = enable; | |
503 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
504 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
505 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
506 | dev->wakeup.flags.valid = 0; | |
507 | return -ENODEV; | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
1da177e4 LT |
513 | /* |
514 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
515 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
516 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
517 | * State Wake) for the device, if present | |
1da177e4 | 518 | */ |
77e76609 | 519 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 520 | { |
993cbe59 | 521 | int err = 0; |
1da177e4 | 522 | |
1da177e4 | 523 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 524 | return -EINVAL; |
1da177e4 | 525 | |
9b83ccd2 RW |
526 | mutex_lock(&acpi_device_lock); |
527 | ||
528 | if (dev->wakeup.prepare_count++) | |
529 | goto out; | |
0af4b8c4 | 530 | |
993cbe59 RW |
531 | err = acpi_power_on_list(&dev->wakeup.resources); |
532 | if (err) { | |
533 | dev_err(&dev->dev, "Cannot turn wakeup power resources on\n"); | |
534 | dev->wakeup.flags.valid = 0; | |
535 | } else { | |
536 | /* | |
537 | * Passing 3 as the third argument below means the device may be | |
538 | * put into arbitrary power state afterward. | |
539 | */ | |
540 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
1da177e4 | 541 | } |
9b83ccd2 RW |
542 | if (err) |
543 | dev->wakeup.prepare_count = 0; | |
544 | ||
545 | out: | |
546 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 547 | return err; |
1da177e4 LT |
548 | } |
549 | ||
550 | /* | |
551 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
552 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
553 | * State Wake) for the device, if present | |
1da177e4 LT |
554 | * 2. Shutdown down the power resources |
555 | */ | |
4be44fcd | 556 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 557 | { |
993cbe59 | 558 | int err = 0; |
1da177e4 LT |
559 | |
560 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 561 | return -EINVAL; |
1da177e4 | 562 | |
9b83ccd2 RW |
563 | mutex_lock(&acpi_device_lock); |
564 | ||
565 | if (--dev->wakeup.prepare_count > 0) | |
566 | goto out; | |
567 | ||
0af4b8c4 | 568 | /* |
9b83ccd2 RW |
569 | * Executing the code below even if prepare_count is already zero when |
570 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 571 | */ |
9b83ccd2 RW |
572 | if (dev->wakeup.prepare_count < 0) |
573 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 574 | |
9b83ccd2 RW |
575 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
576 | if (err) | |
577 | goto out; | |
1da177e4 | 578 | |
993cbe59 RW |
579 | err = acpi_power_off_list(&dev->wakeup.resources); |
580 | if (err) { | |
581 | dev_err(&dev->dev, "Cannot turn wakeup power resources off\n"); | |
582 | dev->wakeup.flags.valid = 0; | |
1da177e4 LT |
583 | } |
584 | ||
9b83ccd2 RW |
585 | out: |
586 | mutex_unlock(&acpi_device_lock); | |
587 | return err; | |
1da177e4 LT |
588 | } |
589 | ||
32a00d27 | 590 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 591 | { |
4be44fcd | 592 | int result = 0; |
4be44fcd LB |
593 | int list_state = 0; |
594 | int i = 0; | |
1da177e4 | 595 | |
32a00d27 | 596 | if (!device || !state) |
d550d98d | 597 | return -EINVAL; |
1da177e4 | 598 | |
1da177e4 LT |
599 | /* |
600 | * We know a device's inferred power state when all the resources | |
601 | * required for a given D-state are 'on'. | |
602 | */ | |
38c92fff | 603 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
604 | struct list_head *list = &device->power.states[i].resources; |
605 | ||
606 | if (list_empty(list)) | |
1da177e4 LT |
607 | continue; |
608 | ||
609 | result = acpi_power_get_list_state(list, &list_state); | |
610 | if (result) | |
d550d98d | 611 | return result; |
1da177e4 LT |
612 | |
613 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 614 | *state = i; |
d550d98d | 615 | return 0; |
1da177e4 LT |
616 | } |
617 | } | |
618 | ||
32a00d27 | 619 | *state = ACPI_STATE_D3; |
d550d98d | 620 | return 0; |
1da177e4 LT |
621 | } |
622 | ||
30d3df41 RW |
623 | int acpi_power_on_resources(struct acpi_device *device, int state) |
624 | { | |
87e753b0 | 625 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
626 | return -EINVAL; |
627 | ||
628 | return acpi_power_on_list(&device->power.states[state].resources); | |
629 | } | |
630 | ||
4be44fcd | 631 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 632 | { |
5c7dd710 | 633 | int result = 0; |
1da177e4 | 634 | |
3ebc81b8 | 635 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 636 | return -EINVAL; |
1da177e4 | 637 | |
0b224527 | 638 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
639 | return 0; |
640 | ||
4be44fcd | 641 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 642 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 643 | return -ENODEV; |
1da177e4 | 644 | |
1da177e4 LT |
645 | /* TBD: Resources must be ordered. */ |
646 | ||
647 | /* | |
648 | * First we reference all power resources required in the target list | |
d2ef555b RW |
649 | * (e.g. so the device doesn't lose power while transitioning). Then, |
650 | * we dereference all power resources used in the current list. | |
1da177e4 | 651 | */ |
5c7dd710 RW |
652 | if (state < ACPI_STATE_D3_COLD) |
653 | result = acpi_power_on_list( | |
654 | &device->power.states[state].resources); | |
655 | ||
656 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
657 | acpi_power_off_list( |
658 | &device->power.states[device->power.state].resources); | |
1da177e4 | 659 | |
d2ef555b RW |
660 | /* We shouldn't change the state unless the above operations succeed. */ |
661 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 662 | |
d550d98d | 663 | return result; |
1da177e4 LT |
664 | } |
665 | ||
82c7d5ef RW |
666 | static void acpi_release_power_resource(struct device *dev) |
667 | { | |
668 | struct acpi_device *device = to_acpi_device(dev); | |
669 | struct acpi_power_resource *resource; | |
670 | ||
82c7d5ef | 671 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
672 | |
673 | mutex_lock(&power_resource_list_lock); | |
674 | list_del(&resource->list_node); | |
675 | mutex_unlock(&power_resource_list_lock); | |
676 | ||
677 | acpi_free_ids(device); | |
82c7d5ef RW |
678 | kfree(resource); |
679 | } | |
1da177e4 | 680 | |
e88c9c60 | 681 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 682 | { |
82c7d5ef RW |
683 | struct acpi_power_resource *resource; |
684 | struct acpi_device *device = NULL; | |
4be44fcd LB |
685 | union acpi_object acpi_object; |
686 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
687 | acpi_status status; |
688 | int state, result = -ENODEV; | |
1da177e4 | 689 | |
82c7d5ef RW |
690 | acpi_bus_get_device(handle, &device); |
691 | if (device) | |
e88c9c60 | 692 | return 0; |
1da177e4 | 693 | |
82c7d5ef | 694 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 695 | if (!resource) |
e88c9c60 | 696 | return -ENOMEM; |
1da177e4 | 697 | |
82c7d5ef RW |
698 | device = &resource->device; |
699 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
700 | ACPI_STA_DEFAULT); | |
0a613902 | 701 | mutex_init(&resource->resource_lock); |
bc9b6407 | 702 | INIT_LIST_HEAD(&resource->dependent); |
82c7d5ef | 703 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
704 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
705 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 706 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
707 | |
708 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
709 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
710 | if (ACPI_FAILURE(status)) | |
781d737c | 711 | goto err; |
82c7d5ef | 712 | |
1da177e4 LT |
713 | resource->system_level = acpi_object.power_resource.system_level; |
714 | resource->order = acpi_object.power_resource.resource_order; | |
715 | ||
82c7d5ef | 716 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 717 | if (result) |
781d737c | 718 | goto err; |
1da177e4 | 719 | |
1da177e4 | 720 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 721 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 722 | |
82c7d5ef | 723 | device->flags.match_driver = true; |
cf860be6 | 724 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 725 | if (result) |
781d737c | 726 | goto err; |
4be44fcd | 727 | |
781d737c RW |
728 | mutex_lock(&power_resource_list_lock); |
729 | list_add(&resource->list_node, &acpi_power_resource_list); | |
730 | mutex_unlock(&power_resource_list_lock); | |
cf860be6 | 731 | acpi_device_add_finalize(device); |
e88c9c60 | 732 | return 0; |
1da177e4 | 733 | |
781d737c RW |
734 | err: |
735 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 736 | return result; |
781d737c | 737 | } |
1da177e4 | 738 | |
781d737c RW |
739 | #ifdef CONFIG_ACPI_SLEEP |
740 | void acpi_resume_power_resources(void) | |
0a613902 | 741 | { |
3e384ee6 | 742 | struct acpi_power_resource *resource; |
0a613902 | 743 | |
781d737c | 744 | mutex_lock(&power_resource_list_lock); |
0a613902 | 745 | |
781d737c RW |
746 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
747 | int result, state; | |
0a613902 | 748 | |
781d737c | 749 | mutex_lock(&resource->resource_lock); |
0a613902 | 750 | |
781d737c RW |
751 | result = acpi_power_get_state(resource->device.handle, &state); |
752 | if (!result && state == ACPI_POWER_RESOURCE_STATE_OFF | |
753 | && resource->ref_count) { | |
754 | dev_info(&resource->device.dev, "Turning ON\n"); | |
755 | __acpi_power_on(resource); | |
756 | } | |
0a613902 | 757 | |
781d737c RW |
758 | mutex_unlock(&resource->resource_lock); |
759 | } | |
3e384ee6 | 760 | |
781d737c | 761 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 762 | } |
90692404 | 763 | #endif |