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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 | ||
0b224527 RW |
100 | void acpi_power_resources_list_add(acpi_handle handle, struct list_head *list) |
101 | { | |
102 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
103 | struct acpi_power_resource_entry *entry; | |
104 | ||
105 | if (!resource || !list) | |
106 | return; | |
107 | ||
108 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
109 | if (!entry) | |
110 | return; | |
111 | ||
112 | entry->resource = resource; | |
113 | if (!list_empty(list)) { | |
114 | struct acpi_power_resource_entry *e; | |
115 | ||
116 | list_for_each_entry(e, list, node) | |
117 | if (e->resource->order > resource->order) { | |
118 | list_add_tail(&entry->node, &e->node); | |
119 | return; | |
120 | } | |
121 | } | |
122 | list_add_tail(&entry->node, list); | |
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 | ||
a51e145f | 135 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 136 | { |
4be44fcd | 137 | acpi_status status = AE_OK; |
27663c58 | 138 | unsigned long long sta = 0; |
60a4ce7f LM |
139 | char node_name[5]; |
140 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 141 | |
1da177e4 | 142 | |
a51e145f | 143 | if (!handle || !state) |
d550d98d | 144 | return -EINVAL; |
1da177e4 | 145 | |
a51e145f | 146 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 147 | if (ACPI_FAILURE(status)) |
d550d98d | 148 | return -ENODEV; |
1da177e4 | 149 | |
c35923bc AS |
150 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
151 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 152 | |
60a4ce7f LM |
153 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
154 | ||
1da177e4 | 155 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 156 | node_name, |
b1b57fbe | 157 | *state ? "on" : "off")); |
1da177e4 | 158 | |
d550d98d | 159 | return 0; |
1da177e4 LT |
160 | } |
161 | ||
0b224527 | 162 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 163 | { |
0b224527 | 164 | struct acpi_power_resource_entry *entry; |
d0515d9f | 165 | int cur_state; |
1da177e4 LT |
166 | |
167 | if (!list || !state) | |
d550d98d | 168 | return -EINVAL; |
1da177e4 LT |
169 | |
170 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
0b224527 RW |
171 | list_for_each_entry(entry, list, node) { |
172 | struct acpi_power_resource *resource = entry->resource; | |
173 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
174 | int result; |
175 | ||
d0515d9f | 176 | mutex_lock(&resource->resource_lock); |
d0515d9f | 177 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 178 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
179 | if (result) |
180 | return result; | |
181 | ||
182 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
183 | break; |
184 | } | |
185 | ||
186 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 187 | cur_state ? "on" : "off")); |
1da177e4 | 188 | |
d0515d9f | 189 | *state = cur_state; |
d0515d9f | 190 | return 0; |
1da177e4 LT |
191 | } |
192 | ||
bc9b6407 | 193 | static void acpi_power_resume_dependent(struct work_struct *work) |
0090def6 | 194 | { |
bc9b6407 RW |
195 | struct acpi_power_dependent_device *dep; |
196 | struct acpi_device_physical_node *pn; | |
197 | struct acpi_device *adev; | |
0090def6 LM |
198 | int state; |
199 | ||
bc9b6407 RW |
200 | dep = container_of(work, struct acpi_power_dependent_device, work); |
201 | adev = dep->adev; | |
202 | if (acpi_power_get_inferred_state(adev, &state)) | |
0090def6 LM |
203 | return; |
204 | ||
bc9b6407 | 205 | if (state > ACPI_STATE_D0) |
0090def6 LM |
206 | return; |
207 | ||
bc9b6407 RW |
208 | mutex_lock(&adev->physical_node_lock); |
209 | ||
210 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
211 | pm_request_resume(pn->dev); | |
212 | ||
213 | list_for_each_entry(pn, &adev->power_dependent, node) | |
214 | pm_request_resume(pn->dev); | |
215 | ||
216 | mutex_unlock(&adev->physical_node_lock); | |
0090def6 LM |
217 | } |
218 | ||
3e384ee6 | 219 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 220 | { |
4be44fcd | 221 | acpi_status status = AE_OK; |
1da177e4 | 222 | |
82c7d5ef | 223 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
224 | if (ACPI_FAILURE(status)) |
225 | return -ENODEV; | |
226 | ||
3e384ee6 RW |
227 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
228 | resource->name)); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
0b224527 | 233 | static int acpi_power_on(struct acpi_power_resource *resource) |
3e384ee6 | 234 | { |
0b224527 | 235 | int result = 0;; |
1da177e4 | 236 | |
0a613902 | 237 | mutex_lock(&resource->resource_lock); |
0a613902 | 238 | |
3e384ee6 RW |
239 | if (resource->ref_count++) { |
240 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
241 | "Power resource [%s] already on", | |
242 | resource->name)); | |
243 | } else { | |
244 | result = __acpi_power_on(resource); | |
bc9b6407 | 245 | if (result) { |
12b3b5af | 246 | resource->ref_count--; |
bc9b6407 RW |
247 | } else { |
248 | struct acpi_power_dependent_device *dep; | |
40bf66ec | 249 | |
bc9b6407 RW |
250 | list_for_each_entry(dep, &resource->dependent, node) |
251 | schedule_work(&dep->work); | |
252 | } | |
40bf66ec LM |
253 | } |
254 | ||
bc9b6407 | 255 | mutex_unlock(&resource->resource_lock); |
40bf66ec | 256 | |
12b3b5af | 257 | return result; |
1da177e4 LT |
258 | } |
259 | ||
0b224527 | 260 | static int acpi_power_off(struct acpi_power_resource *resource) |
1da177e4 | 261 | { |
4be44fcd | 262 | acpi_status status = AE_OK; |
0b224527 | 263 | int result = 0; |
1da177e4 | 264 | |
0a613902 | 265 | mutex_lock(&resource->resource_lock); |
3e384ee6 RW |
266 | |
267 | if (!resource->ref_count) { | |
268 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
269 | "Power resource [%s] already off", | |
270 | resource->name)); | |
271 | goto unlock; | |
0a613902 | 272 | } |
1da177e4 | 273 | |
3e384ee6 RW |
274 | if (--resource->ref_count) { |
275 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
276 | "Power resource [%s] still in use\n", | |
277 | resource->name)); | |
278 | goto unlock; | |
1da177e4 LT |
279 | } |
280 | ||
82c7d5ef | 281 | status = acpi_evaluate_object(resource->device.handle, "_OFF", NULL, NULL); |
722c929f | 282 | if (ACPI_FAILURE(status)) |
3e384ee6 | 283 | result = -ENODEV; |
722c929f | 284 | else |
3e384ee6 RW |
285 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
286 | "Power resource [%s] turned off\n", | |
287 | resource->name)); | |
1da177e4 | 288 | |
3e384ee6 RW |
289 | unlock: |
290 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 291 | |
3e384ee6 | 292 | return result; |
1da177e4 LT |
293 | } |
294 | ||
0b224527 | 295 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 296 | { |
0b224527 RW |
297 | struct acpi_power_resource_entry *entry; |
298 | int result = 0; | |
d2ef555b | 299 | |
0b224527 RW |
300 | list_for_each_entry_reverse(entry, list, node) { |
301 | result = acpi_power_off(entry->resource); | |
302 | if (result) | |
303 | goto err; | |
304 | } | |
305 | return 0; | |
d2ef555b | 306 | |
0b224527 RW |
307 | err: |
308 | list_for_each_entry_continue(entry, list, node) | |
309 | acpi_power_on(entry->resource); | |
310 | ||
311 | return result; | |
d2ef555b RW |
312 | } |
313 | ||
0b224527 | 314 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 315 | { |
0b224527 | 316 | struct acpi_power_resource_entry *entry; |
d2ef555b | 317 | int result = 0; |
d2ef555b | 318 | |
0b224527 RW |
319 | list_for_each_entry(entry, list, node) { |
320 | result = acpi_power_on(entry->resource); | |
321 | if (result) | |
322 | goto err; | |
d2ef555b | 323 | } |
0b224527 RW |
324 | return 0; |
325 | ||
326 | err: | |
327 | list_for_each_entry_continue_reverse(entry, list, node) | |
328 | acpi_power_off(entry->resource); | |
d2ef555b RW |
329 | |
330 | return result; | |
331 | } | |
332 | ||
0b224527 | 333 | static void acpi_power_add_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 334 | struct acpi_device *adev) |
0090def6 | 335 | { |
bc9b6407 | 336 | struct acpi_power_dependent_device *dep; |
0090def6 | 337 | |
bc9b6407 | 338 | mutex_lock(&resource->resource_lock); |
0090def6 | 339 | |
bc9b6407 RW |
340 | list_for_each_entry(dep, &resource->dependent, node) |
341 | if (dep->adev == adev) | |
342 | goto out; | |
0090def6 | 343 | |
bc9b6407 RW |
344 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
345 | if (!dep) | |
346 | goto out; | |
0090def6 | 347 | |
bc9b6407 RW |
348 | dep->adev = adev; |
349 | INIT_WORK(&dep->work, acpi_power_resume_dependent); | |
350 | list_add_tail(&dep->node, &resource->dependent); | |
0090def6 | 351 | |
bc9b6407 RW |
352 | out: |
353 | mutex_unlock(&resource->resource_lock); | |
0090def6 LM |
354 | } |
355 | ||
0b224527 | 356 | static void acpi_power_remove_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 357 | struct acpi_device *adev) |
0090def6 | 358 | { |
bc9b6407 | 359 | struct acpi_power_dependent_device *dep; |
bc9b6407 | 360 | struct work_struct *work = NULL; |
0090def6 | 361 | |
bc9b6407 | 362 | mutex_lock(&resource->resource_lock); |
0090def6 | 363 | |
bc9b6407 RW |
364 | list_for_each_entry(dep, &resource->dependent, node) |
365 | if (dep->adev == adev) { | |
366 | list_del(&dep->node); | |
367 | work = &dep->work; | |
368 | break; | |
369 | } | |
0090def6 | 370 | |
bc9b6407 | 371 | mutex_unlock(&resource->resource_lock); |
0090def6 | 372 | |
bc9b6407 RW |
373 | if (work) { |
374 | cancel_work_sync(work); | |
375 | kfree(dep); | |
376 | } | |
0090def6 LM |
377 | } |
378 | ||
bc9b6407 | 379 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
0090def6 | 380 | { |
bc9b6407 RW |
381 | if (adev->power.flags.power_resources) { |
382 | struct acpi_device_power_state *ps; | |
0b224527 | 383 | struct acpi_power_resource_entry *entry; |
0090def6 | 384 | |
bc9b6407 | 385 | ps = &adev->power.states[ACPI_STATE_D0]; |
0b224527 RW |
386 | list_for_each_entry(entry, &ps->resources, node) { |
387 | struct acpi_power_resource *resource = entry->resource; | |
0090def6 | 388 | |
bc9b6407 | 389 | if (add) |
0b224527 | 390 | acpi_power_add_dependent(resource, adev); |
bc9b6407 | 391 | else |
0b224527 | 392 | acpi_power_remove_dependent(resource, adev); |
0090def6 LM |
393 | } |
394 | } | |
0090def6 | 395 | } |
bc9b6407 RW |
396 | |
397 | /* -------------------------------------------------------------------------- | |
398 | Device Power Management | |
399 | -------------------------------------------------------------------------- */ | |
0090def6 | 400 | |
77e76609 RW |
401 | /** |
402 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
403 | * ACPI 3.0) _PSW (Power State Wake) | |
404 | * @dev: Device to handle. | |
405 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
406 | * @sleep_state: Target sleep state of the system. | |
407 | * @dev_state: Target power state of the device. | |
408 | * | |
409 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
410 | * State Wake) for the device, if present. On failure reset the device's | |
411 | * wakeup.flags.valid flag. | |
412 | * | |
413 | * RETURN VALUE: | |
414 | * 0 if either _DSW or _PSW has been successfully executed | |
415 | * 0 if neither _DSW nor _PSW has been found | |
416 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
417 | */ | |
418 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
419 | int enable, int sleep_state, int dev_state) | |
420 | { | |
421 | union acpi_object in_arg[3]; | |
422 | struct acpi_object_list arg_list = { 3, in_arg }; | |
423 | acpi_status status = AE_OK; | |
424 | ||
425 | /* | |
426 | * Try to execute _DSW first. | |
427 | * | |
428 | * Three agruments are needed for the _DSW object: | |
429 | * Argument 0: enable/disable the wake capabilities | |
430 | * Argument 1: target system state | |
431 | * Argument 2: target device state | |
432 | * When _DSW object is called to disable the wake capabilities, maybe | |
433 | * the first argument is filled. The values of the other two agruments | |
434 | * are meaningless. | |
435 | */ | |
436 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
437 | in_arg[0].integer.value = enable; | |
438 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
439 | in_arg[1].integer.value = sleep_state; | |
440 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
441 | in_arg[2].integer.value = dev_state; | |
442 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
443 | if (ACPI_SUCCESS(status)) { | |
444 | return 0; | |
445 | } else if (status != AE_NOT_FOUND) { | |
446 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
447 | dev->wakeup.flags.valid = 0; | |
448 | return -ENODEV; | |
449 | } | |
450 | ||
451 | /* Execute _PSW */ | |
452 | arg_list.count = 1; | |
453 | in_arg[0].integer.value = enable; | |
454 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
455 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
456 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
457 | dev->wakeup.flags.valid = 0; | |
458 | return -ENODEV; | |
459 | } | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
1da177e4 LT |
464 | /* |
465 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
466 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
467 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
468 | * State Wake) for the device, if present | |
1da177e4 | 469 | */ |
77e76609 | 470 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 471 | { |
9b83ccd2 | 472 | int i, err = 0; |
1da177e4 | 473 | |
1da177e4 | 474 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 475 | return -EINVAL; |
1da177e4 | 476 | |
9b83ccd2 RW |
477 | mutex_lock(&acpi_device_lock); |
478 | ||
479 | if (dev->wakeup.prepare_count++) | |
480 | goto out; | |
0af4b8c4 | 481 | |
1da177e4 LT |
482 | /* Open power resource */ |
483 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
3e384ee6 | 484 | int ret = acpi_power_on(dev->wakeup.resources.handles[i]); |
1da177e4 | 485 | if (ret) { |
6468463a | 486 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 487 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
488 | err = -ENODEV; |
489 | goto err_out; | |
1da177e4 LT |
490 | } |
491 | } | |
492 | ||
77e76609 RW |
493 | /* |
494 | * Passing 3 as the third argument below means the device may be placed | |
495 | * in arbitrary power state afterwards. | |
496 | */ | |
0af4b8c4 | 497 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); |
0af4b8c4 | 498 | |
9b83ccd2 RW |
499 | err_out: |
500 | if (err) | |
501 | dev->wakeup.prepare_count = 0; | |
502 | ||
503 | out: | |
504 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 505 | return err; |
1da177e4 LT |
506 | } |
507 | ||
508 | /* | |
509 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
510 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
511 | * State Wake) for the device, if present | |
1da177e4 LT |
512 | * 2. Shutdown down the power resources |
513 | */ | |
4be44fcd | 514 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 515 | { |
9b83ccd2 | 516 | int i, err = 0; |
1da177e4 LT |
517 | |
518 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 519 | return -EINVAL; |
1da177e4 | 520 | |
9b83ccd2 RW |
521 | mutex_lock(&acpi_device_lock); |
522 | ||
523 | if (--dev->wakeup.prepare_count > 0) | |
524 | goto out; | |
525 | ||
0af4b8c4 | 526 | /* |
9b83ccd2 RW |
527 | * Executing the code below even if prepare_count is already zero when |
528 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 529 | */ |
9b83ccd2 RW |
530 | if (dev->wakeup.prepare_count < 0) |
531 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 532 | |
9b83ccd2 RW |
533 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
534 | if (err) | |
535 | goto out; | |
1da177e4 LT |
536 | |
537 | /* Close power resource */ | |
538 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
36237fa0 | 539 | int ret = acpi_power_off(dev->wakeup.resources.handles[i]); |
1da177e4 | 540 | if (ret) { |
6468463a | 541 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 542 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
543 | err = -ENODEV; |
544 | goto out; | |
1da177e4 LT |
545 | } |
546 | } | |
547 | ||
9b83ccd2 RW |
548 | out: |
549 | mutex_unlock(&acpi_device_lock); | |
550 | return err; | |
1da177e4 LT |
551 | } |
552 | ||
32a00d27 | 553 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 554 | { |
4be44fcd | 555 | int result = 0; |
4be44fcd LB |
556 | int list_state = 0; |
557 | int i = 0; | |
1da177e4 | 558 | |
32a00d27 | 559 | if (!device || !state) |
d550d98d | 560 | return -EINVAL; |
1da177e4 | 561 | |
1da177e4 LT |
562 | /* |
563 | * We know a device's inferred power state when all the resources | |
564 | * required for a given D-state are 'on'. | |
565 | */ | |
38c92fff | 566 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
567 | struct list_head *list = &device->power.states[i].resources; |
568 | ||
569 | if (list_empty(list)) | |
1da177e4 LT |
570 | continue; |
571 | ||
572 | result = acpi_power_get_list_state(list, &list_state); | |
573 | if (result) | |
d550d98d | 574 | return result; |
1da177e4 LT |
575 | |
576 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 577 | *state = i; |
d550d98d | 578 | return 0; |
1da177e4 LT |
579 | } |
580 | } | |
581 | ||
32a00d27 | 582 | *state = ACPI_STATE_D3; |
d550d98d | 583 | return 0; |
1da177e4 LT |
584 | } |
585 | ||
30d3df41 RW |
586 | int acpi_power_on_resources(struct acpi_device *device, int state) |
587 | { | |
0b224527 | 588 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_COLD) |
30d3df41 RW |
589 | return -EINVAL; |
590 | ||
0b224527 RW |
591 | if (state == ACPI_STATE_D3_COLD) |
592 | return 0; | |
593 | ||
30d3df41 RW |
594 | return acpi_power_on_list(&device->power.states[state].resources); |
595 | } | |
596 | ||
4be44fcd | 597 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 598 | { |
5c7dd710 | 599 | int result = 0; |
1da177e4 | 600 | |
3ebc81b8 | 601 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 602 | return -EINVAL; |
1da177e4 | 603 | |
0b224527 | 604 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
605 | return 0; |
606 | ||
4be44fcd | 607 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 608 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 609 | return -ENODEV; |
1da177e4 | 610 | |
1da177e4 LT |
611 | /* TBD: Resources must be ordered. */ |
612 | ||
613 | /* | |
614 | * First we reference all power resources required in the target list | |
d2ef555b RW |
615 | * (e.g. so the device doesn't lose power while transitioning). Then, |
616 | * we dereference all power resources used in the current list. | |
1da177e4 | 617 | */ |
5c7dd710 RW |
618 | if (state < ACPI_STATE_D3_COLD) |
619 | result = acpi_power_on_list( | |
620 | &device->power.states[state].resources); | |
621 | ||
622 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
623 | acpi_power_off_list( |
624 | &device->power.states[device->power.state].resources); | |
1da177e4 | 625 | |
d2ef555b RW |
626 | /* We shouldn't change the state unless the above operations succeed. */ |
627 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 628 | |
d550d98d | 629 | return result; |
1da177e4 LT |
630 | } |
631 | ||
82c7d5ef RW |
632 | static void acpi_release_power_resource(struct device *dev) |
633 | { | |
634 | struct acpi_device *device = to_acpi_device(dev); | |
635 | struct acpi_power_resource *resource; | |
636 | ||
82c7d5ef | 637 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
638 | |
639 | mutex_lock(&power_resource_list_lock); | |
640 | list_del(&resource->list_node); | |
641 | mutex_unlock(&power_resource_list_lock); | |
642 | ||
643 | acpi_free_ids(device); | |
82c7d5ef RW |
644 | kfree(resource); |
645 | } | |
1da177e4 | 646 | |
82c7d5ef | 647 | void acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 648 | { |
82c7d5ef RW |
649 | struct acpi_power_resource *resource; |
650 | struct acpi_device *device = NULL; | |
4be44fcd LB |
651 | union acpi_object acpi_object; |
652 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
653 | acpi_status status; |
654 | int state, result = -ENODEV; | |
1da177e4 | 655 | |
82c7d5ef RW |
656 | acpi_bus_get_device(handle, &device); |
657 | if (device) | |
658 | return; | |
1da177e4 | 659 | |
82c7d5ef | 660 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 661 | if (!resource) |
82c7d5ef | 662 | return; |
1da177e4 | 663 | |
82c7d5ef RW |
664 | device = &resource->device; |
665 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
666 | ACPI_STA_DEFAULT); | |
0a613902 | 667 | mutex_init(&resource->resource_lock); |
bc9b6407 | 668 | INIT_LIST_HEAD(&resource->dependent); |
82c7d5ef | 669 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
670 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
671 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 672 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
673 | |
674 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
675 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
676 | if (ACPI_FAILURE(status)) | |
781d737c | 677 | goto err; |
82c7d5ef | 678 | |
1da177e4 LT |
679 | resource->system_level = acpi_object.power_resource.system_level; |
680 | resource->order = acpi_object.power_resource.resource_order; | |
681 | ||
82c7d5ef | 682 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 683 | if (result) |
781d737c | 684 | goto err; |
1da177e4 | 685 | |
1da177e4 | 686 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 687 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 688 | |
82c7d5ef RW |
689 | device->flags.match_driver = true; |
690 | result = acpi_device_register(device, acpi_release_power_resource); | |
1da177e4 | 691 | if (result) |
781d737c | 692 | goto err; |
4be44fcd | 693 | |
781d737c RW |
694 | mutex_lock(&power_resource_list_lock); |
695 | list_add(&resource->list_node, &acpi_power_resource_list); | |
696 | mutex_unlock(&power_resource_list_lock); | |
82c7d5ef | 697 | return; |
1da177e4 | 698 | |
781d737c RW |
699 | err: |
700 | acpi_release_power_resource(&device->dev); | |
701 | } | |
1da177e4 | 702 | |
781d737c RW |
703 | #ifdef CONFIG_ACPI_SLEEP |
704 | void acpi_resume_power_resources(void) | |
0a613902 | 705 | { |
3e384ee6 | 706 | struct acpi_power_resource *resource; |
0a613902 | 707 | |
781d737c | 708 | mutex_lock(&power_resource_list_lock); |
0a613902 | 709 | |
781d737c RW |
710 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
711 | int result, state; | |
0a613902 | 712 | |
781d737c | 713 | mutex_lock(&resource->resource_lock); |
0a613902 | 714 | |
781d737c RW |
715 | result = acpi_power_get_state(resource->device.handle, &state); |
716 | if (!result && state == ACPI_POWER_RESOURCE_STATE_OFF | |
717 | && resource->ref_count) { | |
718 | dev_info(&resource->device.dev, "Turning ON\n"); | |
719 | __acpi_power_on(resource); | |
720 | } | |
0a613902 | 721 | |
781d737c RW |
722 | mutex_unlock(&resource->resource_lock); |
723 | } | |
3e384ee6 | 724 | |
781d737c | 725 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 726 | } |
90692404 | 727 | #endif |