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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 | ||
ef85bdbe RW |
100 | static void 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) | |
107 | return; | |
108 | ||
109 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
110 | if (!entry) | |
111 | return; | |
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); | |
120 | return; | |
121 | } | |
122 | } | |
123 | list_add_tail(&entry->node, list); | |
124 | } | |
125 | ||
126 | void acpi_power_resources_list_free(struct list_head *list) | |
127 | { | |
128 | struct acpi_power_resource_entry *entry, *e; | |
129 | ||
130 | list_for_each_entry_safe(entry, e, list, node) { | |
131 | list_del(&entry->node); | |
132 | kfree(entry); | |
133 | } | |
134 | } | |
135 | ||
ef85bdbe RW |
136 | acpi_status acpi_extract_power_resources(union acpi_object *package, |
137 | unsigned int start, | |
138 | struct list_head *list) | |
139 | { | |
140 | acpi_status status = AE_OK; | |
141 | unsigned int i; | |
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) { | |
148 | status = AE_BAD_DATA; | |
149 | break; | |
150 | } | |
151 | rhandle = element->reference.handle; | |
152 | if (!rhandle) { | |
153 | status = AE_NULL_ENTRY; | |
154 | break; | |
155 | } | |
156 | acpi_add_power_resource(rhandle); | |
157 | acpi_power_resources_list_add(rhandle, list); | |
158 | } | |
159 | if (ACPI_FAILURE(status)) | |
160 | acpi_power_resources_list_free(list); | |
161 | ||
162 | return status; | |
163 | } | |
164 | ||
a51e145f | 165 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 166 | { |
4be44fcd | 167 | acpi_status status = AE_OK; |
27663c58 | 168 | unsigned long long sta = 0; |
60a4ce7f LM |
169 | char node_name[5]; |
170 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 171 | |
1da177e4 | 172 | |
a51e145f | 173 | if (!handle || !state) |
d550d98d | 174 | return -EINVAL; |
1da177e4 | 175 | |
a51e145f | 176 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 177 | if (ACPI_FAILURE(status)) |
d550d98d | 178 | return -ENODEV; |
1da177e4 | 179 | |
c35923bc AS |
180 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
181 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 182 | |
60a4ce7f LM |
183 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
184 | ||
1da177e4 | 185 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 186 | node_name, |
b1b57fbe | 187 | *state ? "on" : "off")); |
1da177e4 | 188 | |
d550d98d | 189 | return 0; |
1da177e4 LT |
190 | } |
191 | ||
0b224527 | 192 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 193 | { |
0b224527 | 194 | struct acpi_power_resource_entry *entry; |
d0515d9f | 195 | int cur_state; |
1da177e4 LT |
196 | |
197 | if (!list || !state) | |
d550d98d | 198 | return -EINVAL; |
1da177e4 LT |
199 | |
200 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
0b224527 RW |
201 | list_for_each_entry(entry, list, node) { |
202 | struct acpi_power_resource *resource = entry->resource; | |
203 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
204 | int result; |
205 | ||
d0515d9f | 206 | mutex_lock(&resource->resource_lock); |
d0515d9f | 207 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 208 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
209 | if (result) |
210 | return result; | |
211 | ||
212 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
213 | break; |
214 | } | |
215 | ||
216 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 217 | cur_state ? "on" : "off")); |
1da177e4 | 218 | |
d0515d9f | 219 | *state = cur_state; |
d0515d9f | 220 | return 0; |
1da177e4 LT |
221 | } |
222 | ||
bc9b6407 | 223 | static void acpi_power_resume_dependent(struct work_struct *work) |
0090def6 | 224 | { |
bc9b6407 RW |
225 | struct acpi_power_dependent_device *dep; |
226 | struct acpi_device_physical_node *pn; | |
227 | struct acpi_device *adev; | |
0090def6 LM |
228 | int state; |
229 | ||
bc9b6407 RW |
230 | dep = container_of(work, struct acpi_power_dependent_device, work); |
231 | adev = dep->adev; | |
232 | if (acpi_power_get_inferred_state(adev, &state)) | |
0090def6 LM |
233 | return; |
234 | ||
bc9b6407 | 235 | if (state > ACPI_STATE_D0) |
0090def6 LM |
236 | return; |
237 | ||
bc9b6407 RW |
238 | mutex_lock(&adev->physical_node_lock); |
239 | ||
240 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
241 | pm_request_resume(pn->dev); | |
242 | ||
243 | list_for_each_entry(pn, &adev->power_dependent, node) | |
244 | pm_request_resume(pn->dev); | |
245 | ||
246 | mutex_unlock(&adev->physical_node_lock); | |
0090def6 LM |
247 | } |
248 | ||
3e384ee6 | 249 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 250 | { |
4be44fcd | 251 | acpi_status status = AE_OK; |
1da177e4 | 252 | |
82c7d5ef | 253 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
254 | if (ACPI_FAILURE(status)) |
255 | return -ENODEV; | |
256 | ||
3e384ee6 RW |
257 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
258 | resource->name)); | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
0b224527 | 263 | static int acpi_power_on(struct acpi_power_resource *resource) |
3e384ee6 | 264 | { |
0b224527 | 265 | int result = 0;; |
1da177e4 | 266 | |
0a613902 | 267 | mutex_lock(&resource->resource_lock); |
0a613902 | 268 | |
3e384ee6 RW |
269 | if (resource->ref_count++) { |
270 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
271 | "Power resource [%s] already on", | |
272 | resource->name)); | |
273 | } else { | |
274 | result = __acpi_power_on(resource); | |
bc9b6407 | 275 | if (result) { |
12b3b5af | 276 | resource->ref_count--; |
bc9b6407 RW |
277 | } else { |
278 | struct acpi_power_dependent_device *dep; | |
40bf66ec | 279 | |
bc9b6407 RW |
280 | list_for_each_entry(dep, &resource->dependent, node) |
281 | schedule_work(&dep->work); | |
282 | } | |
40bf66ec LM |
283 | } |
284 | ||
bc9b6407 | 285 | mutex_unlock(&resource->resource_lock); |
40bf66ec | 286 | |
12b3b5af | 287 | return result; |
1da177e4 LT |
288 | } |
289 | ||
0b224527 | 290 | static int acpi_power_off(struct acpi_power_resource *resource) |
1da177e4 | 291 | { |
4be44fcd | 292 | acpi_status status = AE_OK; |
0b224527 | 293 | int result = 0; |
1da177e4 | 294 | |
0a613902 | 295 | mutex_lock(&resource->resource_lock); |
3e384ee6 RW |
296 | |
297 | if (!resource->ref_count) { | |
298 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
299 | "Power resource [%s] already off", | |
300 | resource->name)); | |
301 | goto unlock; | |
0a613902 | 302 | } |
1da177e4 | 303 | |
3e384ee6 RW |
304 | if (--resource->ref_count) { |
305 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
306 | "Power resource [%s] still in use\n", | |
307 | resource->name)); | |
308 | goto unlock; | |
1da177e4 LT |
309 | } |
310 | ||
82c7d5ef | 311 | status = acpi_evaluate_object(resource->device.handle, "_OFF", NULL, NULL); |
722c929f | 312 | if (ACPI_FAILURE(status)) |
3e384ee6 | 313 | result = -ENODEV; |
722c929f | 314 | else |
3e384ee6 RW |
315 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
316 | "Power resource [%s] turned off\n", | |
317 | resource->name)); | |
1da177e4 | 318 | |
3e384ee6 RW |
319 | unlock: |
320 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 321 | |
3e384ee6 | 322 | return result; |
1da177e4 LT |
323 | } |
324 | ||
0b224527 | 325 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 326 | { |
0b224527 RW |
327 | struct acpi_power_resource_entry *entry; |
328 | int result = 0; | |
d2ef555b | 329 | |
0b224527 RW |
330 | list_for_each_entry_reverse(entry, list, node) { |
331 | result = acpi_power_off(entry->resource); | |
332 | if (result) | |
333 | goto err; | |
334 | } | |
335 | return 0; | |
d2ef555b | 336 | |
0b224527 RW |
337 | err: |
338 | list_for_each_entry_continue(entry, list, node) | |
339 | acpi_power_on(entry->resource); | |
340 | ||
341 | return result; | |
d2ef555b RW |
342 | } |
343 | ||
0b224527 | 344 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 345 | { |
0b224527 | 346 | struct acpi_power_resource_entry *entry; |
d2ef555b | 347 | int result = 0; |
d2ef555b | 348 | |
0b224527 RW |
349 | list_for_each_entry(entry, list, node) { |
350 | result = acpi_power_on(entry->resource); | |
351 | if (result) | |
352 | goto err; | |
d2ef555b | 353 | } |
0b224527 RW |
354 | return 0; |
355 | ||
356 | err: | |
357 | list_for_each_entry_continue_reverse(entry, list, node) | |
358 | acpi_power_off(entry->resource); | |
d2ef555b RW |
359 | |
360 | return result; | |
361 | } | |
362 | ||
0b224527 | 363 | static void acpi_power_add_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 364 | struct acpi_device *adev) |
0090def6 | 365 | { |
bc9b6407 | 366 | struct acpi_power_dependent_device *dep; |
0090def6 | 367 | |
bc9b6407 | 368 | mutex_lock(&resource->resource_lock); |
0090def6 | 369 | |
bc9b6407 RW |
370 | list_for_each_entry(dep, &resource->dependent, node) |
371 | if (dep->adev == adev) | |
372 | goto out; | |
0090def6 | 373 | |
bc9b6407 RW |
374 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
375 | if (!dep) | |
376 | goto out; | |
0090def6 | 377 | |
bc9b6407 RW |
378 | dep->adev = adev; |
379 | INIT_WORK(&dep->work, acpi_power_resume_dependent); | |
380 | list_add_tail(&dep->node, &resource->dependent); | |
0090def6 | 381 | |
bc9b6407 RW |
382 | out: |
383 | mutex_unlock(&resource->resource_lock); | |
0090def6 LM |
384 | } |
385 | ||
0b224527 | 386 | static void acpi_power_remove_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 387 | struct acpi_device *adev) |
0090def6 | 388 | { |
bc9b6407 | 389 | struct acpi_power_dependent_device *dep; |
bc9b6407 | 390 | struct work_struct *work = NULL; |
0090def6 | 391 | |
bc9b6407 | 392 | mutex_lock(&resource->resource_lock); |
0090def6 | 393 | |
bc9b6407 RW |
394 | list_for_each_entry(dep, &resource->dependent, node) |
395 | if (dep->adev == adev) { | |
396 | list_del(&dep->node); | |
397 | work = &dep->work; | |
398 | break; | |
399 | } | |
0090def6 | 400 | |
bc9b6407 | 401 | mutex_unlock(&resource->resource_lock); |
0090def6 | 402 | |
bc9b6407 RW |
403 | if (work) { |
404 | cancel_work_sync(work); | |
405 | kfree(dep); | |
406 | } | |
0090def6 LM |
407 | } |
408 | ||
bc9b6407 | 409 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
0090def6 | 410 | { |
bc9b6407 RW |
411 | if (adev->power.flags.power_resources) { |
412 | struct acpi_device_power_state *ps; | |
0b224527 | 413 | struct acpi_power_resource_entry *entry; |
0090def6 | 414 | |
bc9b6407 | 415 | ps = &adev->power.states[ACPI_STATE_D0]; |
0b224527 RW |
416 | list_for_each_entry(entry, &ps->resources, node) { |
417 | struct acpi_power_resource *resource = entry->resource; | |
0090def6 | 418 | |
bc9b6407 | 419 | if (add) |
0b224527 | 420 | acpi_power_add_dependent(resource, adev); |
bc9b6407 | 421 | else |
0b224527 | 422 | acpi_power_remove_dependent(resource, adev); |
0090def6 LM |
423 | } |
424 | } | |
0090def6 | 425 | } |
bc9b6407 RW |
426 | |
427 | /* -------------------------------------------------------------------------- | |
428 | Device Power Management | |
429 | -------------------------------------------------------------------------- */ | |
0090def6 | 430 | |
77e76609 RW |
431 | /** |
432 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
433 | * ACPI 3.0) _PSW (Power State Wake) | |
434 | * @dev: Device to handle. | |
435 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
436 | * @sleep_state: Target sleep state of the system. | |
437 | * @dev_state: Target power state of the device. | |
438 | * | |
439 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
440 | * State Wake) for the device, if present. On failure reset the device's | |
441 | * wakeup.flags.valid flag. | |
442 | * | |
443 | * RETURN VALUE: | |
444 | * 0 if either _DSW or _PSW has been successfully executed | |
445 | * 0 if neither _DSW nor _PSW has been found | |
446 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
447 | */ | |
448 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
449 | int enable, int sleep_state, int dev_state) | |
450 | { | |
451 | union acpi_object in_arg[3]; | |
452 | struct acpi_object_list arg_list = { 3, in_arg }; | |
453 | acpi_status status = AE_OK; | |
454 | ||
455 | /* | |
456 | * Try to execute _DSW first. | |
457 | * | |
458 | * Three agruments are needed for the _DSW object: | |
459 | * Argument 0: enable/disable the wake capabilities | |
460 | * Argument 1: target system state | |
461 | * Argument 2: target device state | |
462 | * When _DSW object is called to disable the wake capabilities, maybe | |
463 | * the first argument is filled. The values of the other two agruments | |
464 | * are meaningless. | |
465 | */ | |
466 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
467 | in_arg[0].integer.value = enable; | |
468 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
469 | in_arg[1].integer.value = sleep_state; | |
470 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
471 | in_arg[2].integer.value = dev_state; | |
472 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
473 | if (ACPI_SUCCESS(status)) { | |
474 | return 0; | |
475 | } else if (status != AE_NOT_FOUND) { | |
476 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
477 | dev->wakeup.flags.valid = 0; | |
478 | return -ENODEV; | |
479 | } | |
480 | ||
481 | /* Execute _PSW */ | |
482 | arg_list.count = 1; | |
483 | in_arg[0].integer.value = enable; | |
484 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
485 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
486 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
487 | dev->wakeup.flags.valid = 0; | |
488 | return -ENODEV; | |
489 | } | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
1da177e4 LT |
494 | /* |
495 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
496 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
497 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
498 | * State Wake) for the device, if present | |
1da177e4 | 499 | */ |
77e76609 | 500 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 501 | { |
993cbe59 | 502 | int err = 0; |
1da177e4 | 503 | |
1da177e4 | 504 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 505 | return -EINVAL; |
1da177e4 | 506 | |
9b83ccd2 RW |
507 | mutex_lock(&acpi_device_lock); |
508 | ||
509 | if (dev->wakeup.prepare_count++) | |
510 | goto out; | |
0af4b8c4 | 511 | |
993cbe59 RW |
512 | err = acpi_power_on_list(&dev->wakeup.resources); |
513 | if (err) { | |
514 | dev_err(&dev->dev, "Cannot turn wakeup power resources on\n"); | |
515 | dev->wakeup.flags.valid = 0; | |
516 | } else { | |
517 | /* | |
518 | * Passing 3 as the third argument below means the device may be | |
519 | * put into arbitrary power state afterward. | |
520 | */ | |
521 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
1da177e4 | 522 | } |
9b83ccd2 RW |
523 | if (err) |
524 | dev->wakeup.prepare_count = 0; | |
525 | ||
526 | out: | |
527 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 528 | return err; |
1da177e4 LT |
529 | } |
530 | ||
531 | /* | |
532 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
533 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
534 | * State Wake) for the device, if present | |
1da177e4 LT |
535 | * 2. Shutdown down the power resources |
536 | */ | |
4be44fcd | 537 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 538 | { |
993cbe59 | 539 | int err = 0; |
1da177e4 LT |
540 | |
541 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 542 | return -EINVAL; |
1da177e4 | 543 | |
9b83ccd2 RW |
544 | mutex_lock(&acpi_device_lock); |
545 | ||
546 | if (--dev->wakeup.prepare_count > 0) | |
547 | goto out; | |
548 | ||
0af4b8c4 | 549 | /* |
9b83ccd2 RW |
550 | * Executing the code below even if prepare_count is already zero when |
551 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 552 | */ |
9b83ccd2 RW |
553 | if (dev->wakeup.prepare_count < 0) |
554 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 555 | |
9b83ccd2 RW |
556 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
557 | if (err) | |
558 | goto out; | |
1da177e4 | 559 | |
993cbe59 RW |
560 | err = acpi_power_off_list(&dev->wakeup.resources); |
561 | if (err) { | |
562 | dev_err(&dev->dev, "Cannot turn wakeup power resources off\n"); | |
563 | dev->wakeup.flags.valid = 0; | |
1da177e4 LT |
564 | } |
565 | ||
9b83ccd2 RW |
566 | out: |
567 | mutex_unlock(&acpi_device_lock); | |
568 | return err; | |
1da177e4 LT |
569 | } |
570 | ||
32a00d27 | 571 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 572 | { |
4be44fcd | 573 | int result = 0; |
4be44fcd LB |
574 | int list_state = 0; |
575 | int i = 0; | |
1da177e4 | 576 | |
32a00d27 | 577 | if (!device || !state) |
d550d98d | 578 | return -EINVAL; |
1da177e4 | 579 | |
1da177e4 LT |
580 | /* |
581 | * We know a device's inferred power state when all the resources | |
582 | * required for a given D-state are 'on'. | |
583 | */ | |
38c92fff | 584 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
585 | struct list_head *list = &device->power.states[i].resources; |
586 | ||
587 | if (list_empty(list)) | |
1da177e4 LT |
588 | continue; |
589 | ||
590 | result = acpi_power_get_list_state(list, &list_state); | |
591 | if (result) | |
d550d98d | 592 | return result; |
1da177e4 LT |
593 | |
594 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 595 | *state = i; |
d550d98d | 596 | return 0; |
1da177e4 LT |
597 | } |
598 | } | |
599 | ||
32a00d27 | 600 | *state = ACPI_STATE_D3; |
d550d98d | 601 | return 0; |
1da177e4 LT |
602 | } |
603 | ||
30d3df41 RW |
604 | int acpi_power_on_resources(struct acpi_device *device, int state) |
605 | { | |
0b224527 | 606 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_COLD) |
30d3df41 RW |
607 | return -EINVAL; |
608 | ||
0b224527 RW |
609 | if (state == ACPI_STATE_D3_COLD) |
610 | return 0; | |
611 | ||
30d3df41 RW |
612 | return acpi_power_on_list(&device->power.states[state].resources); |
613 | } | |
614 | ||
4be44fcd | 615 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 616 | { |
5c7dd710 | 617 | int result = 0; |
1da177e4 | 618 | |
3ebc81b8 | 619 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 620 | return -EINVAL; |
1da177e4 | 621 | |
0b224527 | 622 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
623 | return 0; |
624 | ||
4be44fcd | 625 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 626 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 627 | return -ENODEV; |
1da177e4 | 628 | |
1da177e4 LT |
629 | /* TBD: Resources must be ordered. */ |
630 | ||
631 | /* | |
632 | * First we reference all power resources required in the target list | |
d2ef555b RW |
633 | * (e.g. so the device doesn't lose power while transitioning). Then, |
634 | * we dereference all power resources used in the current list. | |
1da177e4 | 635 | */ |
5c7dd710 RW |
636 | if (state < ACPI_STATE_D3_COLD) |
637 | result = acpi_power_on_list( | |
638 | &device->power.states[state].resources); | |
639 | ||
640 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
641 | acpi_power_off_list( |
642 | &device->power.states[device->power.state].resources); | |
1da177e4 | 643 | |
d2ef555b RW |
644 | /* We shouldn't change the state unless the above operations succeed. */ |
645 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 646 | |
d550d98d | 647 | return result; |
1da177e4 LT |
648 | } |
649 | ||
82c7d5ef RW |
650 | static void acpi_release_power_resource(struct device *dev) |
651 | { | |
652 | struct acpi_device *device = to_acpi_device(dev); | |
653 | struct acpi_power_resource *resource; | |
654 | ||
82c7d5ef | 655 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
656 | |
657 | mutex_lock(&power_resource_list_lock); | |
658 | list_del(&resource->list_node); | |
659 | mutex_unlock(&power_resource_list_lock); | |
660 | ||
661 | acpi_free_ids(device); | |
82c7d5ef RW |
662 | kfree(resource); |
663 | } | |
1da177e4 | 664 | |
82c7d5ef | 665 | void acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 666 | { |
82c7d5ef RW |
667 | struct acpi_power_resource *resource; |
668 | struct acpi_device *device = NULL; | |
4be44fcd LB |
669 | union acpi_object acpi_object; |
670 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
671 | acpi_status status; |
672 | int state, result = -ENODEV; | |
1da177e4 | 673 | |
82c7d5ef RW |
674 | acpi_bus_get_device(handle, &device); |
675 | if (device) | |
676 | return; | |
1da177e4 | 677 | |
82c7d5ef | 678 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 679 | if (!resource) |
82c7d5ef | 680 | return; |
1da177e4 | 681 | |
82c7d5ef RW |
682 | device = &resource->device; |
683 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
684 | ACPI_STA_DEFAULT); | |
0a613902 | 685 | mutex_init(&resource->resource_lock); |
bc9b6407 | 686 | INIT_LIST_HEAD(&resource->dependent); |
82c7d5ef | 687 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
688 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
689 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 690 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
691 | |
692 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
693 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
694 | if (ACPI_FAILURE(status)) | |
781d737c | 695 | goto err; |
82c7d5ef | 696 | |
1da177e4 LT |
697 | resource->system_level = acpi_object.power_resource.system_level; |
698 | resource->order = acpi_object.power_resource.resource_order; | |
699 | ||
82c7d5ef | 700 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 701 | if (result) |
781d737c | 702 | goto err; |
1da177e4 | 703 | |
1da177e4 | 704 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 705 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 706 | |
82c7d5ef RW |
707 | device->flags.match_driver = true; |
708 | result = acpi_device_register(device, acpi_release_power_resource); | |
1da177e4 | 709 | if (result) |
781d737c | 710 | goto err; |
4be44fcd | 711 | |
781d737c RW |
712 | mutex_lock(&power_resource_list_lock); |
713 | list_add(&resource->list_node, &acpi_power_resource_list); | |
714 | mutex_unlock(&power_resource_list_lock); | |
82c7d5ef | 715 | return; |
1da177e4 | 716 | |
781d737c RW |
717 | err: |
718 | acpi_release_power_resource(&device->dev); | |
719 | } | |
1da177e4 | 720 | |
781d737c RW |
721 | #ifdef CONFIG_ACPI_SLEEP |
722 | void acpi_resume_power_resources(void) | |
0a613902 | 723 | { |
3e384ee6 | 724 | struct acpi_power_resource *resource; |
0a613902 | 725 | |
781d737c | 726 | mutex_lock(&power_resource_list_lock); |
0a613902 | 727 | |
781d737c RW |
728 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
729 | int result, state; | |
0a613902 | 730 | |
781d737c | 731 | mutex_lock(&resource->resource_lock); |
0a613902 | 732 | |
781d737c RW |
733 | result = acpi_power_get_state(resource->device.handle, &state); |
734 | if (!result && state == ACPI_POWER_RESOURCE_STATE_OFF | |
735 | && resource->ref_count) { | |
736 | dev_info(&resource->device.dev, "Turning ON\n"); | |
737 | __acpi_power_on(resource); | |
738 | } | |
0a613902 | 739 | |
781d737c RW |
740 | mutex_unlock(&resource->resource_lock); |
741 | } | |
3e384ee6 | 742 | |
781d737c | 743 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 744 | } |
90692404 | 745 | #endif |