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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 | ||
781d737c RW |
78 | static LIST_HEAD(acpi_power_resource_list); |
79 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 80 | |
1da177e4 LT |
81 | /* -------------------------------------------------------------------------- |
82 | Power Resource Management | |
83 | -------------------------------------------------------------------------- */ | |
84 | ||
82c7d5ef | 85 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 86 | { |
82c7d5ef | 87 | struct acpi_device *device; |
1da177e4 | 88 | |
82c7d5ef RW |
89 | if (acpi_bus_get_device(handle, &device)) |
90 | return NULL; | |
1da177e4 | 91 | |
82c7d5ef | 92 | return container_of(device, struct acpi_power_resource, device); |
1da177e4 LT |
93 | } |
94 | ||
a51e145f | 95 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 96 | { |
4be44fcd | 97 | acpi_status status = AE_OK; |
27663c58 | 98 | unsigned long long sta = 0; |
60a4ce7f LM |
99 | char node_name[5]; |
100 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 101 | |
1da177e4 | 102 | |
a51e145f | 103 | if (!handle || !state) |
d550d98d | 104 | return -EINVAL; |
1da177e4 | 105 | |
a51e145f | 106 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 107 | if (ACPI_FAILURE(status)) |
d550d98d | 108 | return -ENODEV; |
1da177e4 | 109 | |
c35923bc AS |
110 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
111 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 112 | |
60a4ce7f LM |
113 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
114 | ||
1da177e4 | 115 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 116 | node_name, |
b1b57fbe | 117 | *state ? "on" : "off")); |
1da177e4 | 118 | |
d550d98d | 119 | return 0; |
1da177e4 LT |
120 | } |
121 | ||
4be44fcd | 122 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 123 | { |
d0515d9f RW |
124 | int cur_state; |
125 | int i = 0; | |
1da177e4 LT |
126 | |
127 | if (!list || !state) | |
d550d98d | 128 | return -EINVAL; |
1da177e4 LT |
129 | |
130 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
131 | ||
4be44fcd | 132 | for (i = 0; i < list->count; i++) { |
d0515d9f RW |
133 | struct acpi_power_resource *resource; |
134 | acpi_handle handle = list->handles[i]; | |
135 | int result; | |
136 | ||
82c7d5ef RW |
137 | resource = acpi_power_get_context(handle); |
138 | if (!resource) | |
139 | return -ENODEV; | |
1da177e4 | 140 | |
d0515d9f RW |
141 | mutex_lock(&resource->resource_lock); |
142 | ||
143 | result = acpi_power_get_state(handle, &cur_state); | |
1da177e4 | 144 | |
d0515d9f RW |
145 | mutex_unlock(&resource->resource_lock); |
146 | ||
147 | if (result) | |
148 | return result; | |
149 | ||
150 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
151 | break; |
152 | } | |
153 | ||
154 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 155 | cur_state ? "on" : "off")); |
1da177e4 | 156 | |
d0515d9f RW |
157 | *state = cur_state; |
158 | ||
159 | return 0; | |
1da177e4 LT |
160 | } |
161 | ||
bc9b6407 | 162 | static void acpi_power_resume_dependent(struct work_struct *work) |
0090def6 | 163 | { |
bc9b6407 RW |
164 | struct acpi_power_dependent_device *dep; |
165 | struct acpi_device_physical_node *pn; | |
166 | struct acpi_device *adev; | |
0090def6 LM |
167 | int state; |
168 | ||
bc9b6407 RW |
169 | dep = container_of(work, struct acpi_power_dependent_device, work); |
170 | adev = dep->adev; | |
171 | if (acpi_power_get_inferred_state(adev, &state)) | |
0090def6 LM |
172 | return; |
173 | ||
bc9b6407 | 174 | if (state > ACPI_STATE_D0) |
0090def6 LM |
175 | return; |
176 | ||
bc9b6407 RW |
177 | mutex_lock(&adev->physical_node_lock); |
178 | ||
179 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
180 | pm_request_resume(pn->dev); | |
181 | ||
182 | list_for_each_entry(pn, &adev->power_dependent, node) | |
183 | pm_request_resume(pn->dev); | |
184 | ||
185 | mutex_unlock(&adev->physical_node_lock); | |
0090def6 LM |
186 | } |
187 | ||
3e384ee6 | 188 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 189 | { |
4be44fcd | 190 | acpi_status status = AE_OK; |
1da177e4 | 191 | |
82c7d5ef | 192 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
193 | if (ACPI_FAILURE(status)) |
194 | return -ENODEV; | |
195 | ||
196 | /* Update the power resource's _device_ power state */ | |
82c7d5ef | 197 | resource->device.power.state = ACPI_STATE_D0; |
3e384ee6 RW |
198 | |
199 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", | |
200 | resource->name)); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static int acpi_power_on(acpi_handle handle) | |
206 | { | |
207 | int result = 0; | |
82c7d5ef | 208 | struct acpi_power_resource *resource; |
1da177e4 | 209 | |
82c7d5ef RW |
210 | resource = acpi_power_get_context(handle); |
211 | if (!resource) | |
212 | return -ENODEV; | |
1da177e4 | 213 | |
0a613902 | 214 | mutex_lock(&resource->resource_lock); |
0a613902 | 215 | |
3e384ee6 RW |
216 | if (resource->ref_count++) { |
217 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
218 | "Power resource [%s] already on", | |
219 | resource->name)); | |
220 | } else { | |
221 | result = __acpi_power_on(resource); | |
bc9b6407 | 222 | if (result) { |
12b3b5af | 223 | resource->ref_count--; |
bc9b6407 RW |
224 | } else { |
225 | struct acpi_power_dependent_device *dep; | |
40bf66ec | 226 | |
bc9b6407 RW |
227 | list_for_each_entry(dep, &resource->dependent, node) |
228 | schedule_work(&dep->work); | |
229 | } | |
40bf66ec LM |
230 | } |
231 | ||
bc9b6407 | 232 | mutex_unlock(&resource->resource_lock); |
40bf66ec | 233 | |
12b3b5af | 234 | return result; |
1da177e4 LT |
235 | } |
236 | ||
36237fa0 | 237 | static int acpi_power_off(acpi_handle handle) |
1da177e4 | 238 | { |
bdf43bbf | 239 | int result = 0; |
4be44fcd | 240 | acpi_status status = AE_OK; |
82c7d5ef | 241 | struct acpi_power_resource *resource; |
0a613902 | 242 | |
82c7d5ef RW |
243 | resource = acpi_power_get_context(handle); |
244 | if (!resource) | |
245 | return -ENODEV; | |
1da177e4 | 246 | |
0a613902 | 247 | mutex_lock(&resource->resource_lock); |
3e384ee6 RW |
248 | |
249 | if (!resource->ref_count) { | |
250 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
251 | "Power resource [%s] already off", | |
252 | resource->name)); | |
253 | goto unlock; | |
0a613902 | 254 | } |
1da177e4 | 255 | |
3e384ee6 RW |
256 | if (--resource->ref_count) { |
257 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
258 | "Power resource [%s] still in use\n", | |
259 | resource->name)); | |
260 | goto unlock; | |
1da177e4 LT |
261 | } |
262 | ||
82c7d5ef | 263 | status = acpi_evaluate_object(resource->device.handle, "_OFF", NULL, NULL); |
3e384ee6 RW |
264 | if (ACPI_FAILURE(status)) { |
265 | result = -ENODEV; | |
266 | } else { | |
267 | /* Update the power resource's _device_ power state */ | |
82c7d5ef | 268 | resource->device.power.state = ACPI_STATE_D3; |
1da177e4 | 269 | |
3e384ee6 RW |
270 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
271 | "Power resource [%s] turned off\n", | |
272 | resource->name)); | |
273 | } | |
1da177e4 | 274 | |
3e384ee6 RW |
275 | unlock: |
276 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 277 | |
3e384ee6 | 278 | return result; |
1da177e4 LT |
279 | } |
280 | ||
d2ef555b RW |
281 | static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res) |
282 | { | |
283 | int i; | |
284 | ||
285 | for (i = num_res - 1; i >= 0 ; i--) | |
36237fa0 | 286 | acpi_power_off(list->handles[i]); |
d2ef555b RW |
287 | } |
288 | ||
289 | static void acpi_power_off_list(struct acpi_handle_list *list) | |
290 | { | |
291 | __acpi_power_off_list(list, list->count); | |
292 | } | |
293 | ||
294 | static int acpi_power_on_list(struct acpi_handle_list *list) | |
295 | { | |
296 | int result = 0; | |
297 | int i; | |
298 | ||
299 | for (i = 0; i < list->count; i++) { | |
300 | result = acpi_power_on(list->handles[i]); | |
301 | if (result) { | |
302 | __acpi_power_off_list(list, i); | |
303 | break; | |
304 | } | |
305 | } | |
306 | ||
307 | return result; | |
308 | } | |
309 | ||
bc9b6407 RW |
310 | static void acpi_power_add_dependent(acpi_handle rhandle, |
311 | struct acpi_device *adev) | |
0090def6 | 312 | { |
bc9b6407 RW |
313 | struct acpi_power_dependent_device *dep; |
314 | struct acpi_power_resource *resource; | |
0090def6 | 315 | |
82c7d5ef RW |
316 | if (!rhandle || !adev) |
317 | return; | |
318 | ||
319 | resource = acpi_power_get_context(rhandle); | |
320 | if (!resource) | |
0090def6 LM |
321 | return; |
322 | ||
bc9b6407 | 323 | mutex_lock(&resource->resource_lock); |
0090def6 | 324 | |
bc9b6407 RW |
325 | list_for_each_entry(dep, &resource->dependent, node) |
326 | if (dep->adev == adev) | |
327 | goto out; | |
0090def6 | 328 | |
bc9b6407 RW |
329 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
330 | if (!dep) | |
331 | goto out; | |
0090def6 | 332 | |
bc9b6407 RW |
333 | dep->adev = adev; |
334 | INIT_WORK(&dep->work, acpi_power_resume_dependent); | |
335 | list_add_tail(&dep->node, &resource->dependent); | |
0090def6 | 336 | |
bc9b6407 RW |
337 | out: |
338 | mutex_unlock(&resource->resource_lock); | |
0090def6 LM |
339 | } |
340 | ||
bc9b6407 RW |
341 | static void acpi_power_remove_dependent(acpi_handle rhandle, |
342 | struct acpi_device *adev) | |
0090def6 | 343 | { |
bc9b6407 RW |
344 | struct acpi_power_dependent_device *dep; |
345 | struct acpi_power_resource *resource; | |
346 | struct work_struct *work = NULL; | |
0090def6 | 347 | |
82c7d5ef RW |
348 | if (!rhandle || !adev) |
349 | return; | |
350 | ||
351 | resource = acpi_power_get_context(rhandle); | |
352 | if (!resource) | |
bc9b6407 | 353 | return; |
0090def6 | 354 | |
bc9b6407 | 355 | mutex_lock(&resource->resource_lock); |
0090def6 | 356 | |
bc9b6407 RW |
357 | list_for_each_entry(dep, &resource->dependent, node) |
358 | if (dep->adev == adev) { | |
359 | list_del(&dep->node); | |
360 | work = &dep->work; | |
361 | break; | |
362 | } | |
0090def6 | 363 | |
bc9b6407 | 364 | mutex_unlock(&resource->resource_lock); |
0090def6 | 365 | |
bc9b6407 RW |
366 | if (work) { |
367 | cancel_work_sync(work); | |
368 | kfree(dep); | |
369 | } | |
0090def6 LM |
370 | } |
371 | ||
bc9b6407 | 372 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
0090def6 | 373 | { |
bc9b6407 RW |
374 | if (adev->power.flags.power_resources) { |
375 | struct acpi_device_power_state *ps; | |
376 | int j; | |
0090def6 | 377 | |
bc9b6407 RW |
378 | ps = &adev->power.states[ACPI_STATE_D0]; |
379 | for (j = 0; j < ps->resources.count; j++) { | |
380 | acpi_handle rhandle = ps->resources.handles[j]; | |
0090def6 | 381 | |
bc9b6407 RW |
382 | if (add) |
383 | acpi_power_add_dependent(rhandle, adev); | |
384 | else | |
385 | acpi_power_remove_dependent(rhandle, adev); | |
0090def6 LM |
386 | } |
387 | } | |
0090def6 | 388 | } |
bc9b6407 RW |
389 | |
390 | /* -------------------------------------------------------------------------- | |
391 | Device Power Management | |
392 | -------------------------------------------------------------------------- */ | |
0090def6 | 393 | |
77e76609 RW |
394 | /** |
395 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
396 | * ACPI 3.0) _PSW (Power State Wake) | |
397 | * @dev: Device to handle. | |
398 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
399 | * @sleep_state: Target sleep state of the system. | |
400 | * @dev_state: Target power state of the device. | |
401 | * | |
402 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
403 | * State Wake) for the device, if present. On failure reset the device's | |
404 | * wakeup.flags.valid flag. | |
405 | * | |
406 | * RETURN VALUE: | |
407 | * 0 if either _DSW or _PSW has been successfully executed | |
408 | * 0 if neither _DSW nor _PSW has been found | |
409 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
410 | */ | |
411 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
412 | int enable, int sleep_state, int dev_state) | |
413 | { | |
414 | union acpi_object in_arg[3]; | |
415 | struct acpi_object_list arg_list = { 3, in_arg }; | |
416 | acpi_status status = AE_OK; | |
417 | ||
418 | /* | |
419 | * Try to execute _DSW first. | |
420 | * | |
421 | * Three agruments are needed for the _DSW object: | |
422 | * Argument 0: enable/disable the wake capabilities | |
423 | * Argument 1: target system state | |
424 | * Argument 2: target device state | |
425 | * When _DSW object is called to disable the wake capabilities, maybe | |
426 | * the first argument is filled. The values of the other two agruments | |
427 | * are meaningless. | |
428 | */ | |
429 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
430 | in_arg[0].integer.value = enable; | |
431 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
432 | in_arg[1].integer.value = sleep_state; | |
433 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
434 | in_arg[2].integer.value = dev_state; | |
435 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
436 | if (ACPI_SUCCESS(status)) { | |
437 | return 0; | |
438 | } else if (status != AE_NOT_FOUND) { | |
439 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
440 | dev->wakeup.flags.valid = 0; | |
441 | return -ENODEV; | |
442 | } | |
443 | ||
444 | /* Execute _PSW */ | |
445 | arg_list.count = 1; | |
446 | in_arg[0].integer.value = enable; | |
447 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
448 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
449 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
450 | dev->wakeup.flags.valid = 0; | |
451 | return -ENODEV; | |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /* |
458 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
459 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
460 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
461 | * State Wake) for the device, if present | |
1da177e4 | 462 | */ |
77e76609 | 463 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 464 | { |
9b83ccd2 | 465 | int i, err = 0; |
1da177e4 | 466 | |
1da177e4 | 467 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 468 | return -EINVAL; |
1da177e4 | 469 | |
9b83ccd2 RW |
470 | mutex_lock(&acpi_device_lock); |
471 | ||
472 | if (dev->wakeup.prepare_count++) | |
473 | goto out; | |
0af4b8c4 | 474 | |
1da177e4 LT |
475 | /* Open power resource */ |
476 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
3e384ee6 | 477 | int ret = acpi_power_on(dev->wakeup.resources.handles[i]); |
1da177e4 | 478 | if (ret) { |
6468463a | 479 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 480 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
481 | err = -ENODEV; |
482 | goto err_out; | |
1da177e4 LT |
483 | } |
484 | } | |
485 | ||
77e76609 RW |
486 | /* |
487 | * Passing 3 as the third argument below means the device may be placed | |
488 | * in arbitrary power state afterwards. | |
489 | */ | |
0af4b8c4 | 490 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); |
0af4b8c4 | 491 | |
9b83ccd2 RW |
492 | err_out: |
493 | if (err) | |
494 | dev->wakeup.prepare_count = 0; | |
495 | ||
496 | out: | |
497 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 498 | return err; |
1da177e4 LT |
499 | } |
500 | ||
501 | /* | |
502 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
503 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
504 | * State Wake) for the device, if present | |
1da177e4 LT |
505 | * 2. Shutdown down the power resources |
506 | */ | |
4be44fcd | 507 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 508 | { |
9b83ccd2 | 509 | int i, err = 0; |
1da177e4 LT |
510 | |
511 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 512 | return -EINVAL; |
1da177e4 | 513 | |
9b83ccd2 RW |
514 | mutex_lock(&acpi_device_lock); |
515 | ||
516 | if (--dev->wakeup.prepare_count > 0) | |
517 | goto out; | |
518 | ||
0af4b8c4 | 519 | /* |
9b83ccd2 RW |
520 | * Executing the code below even if prepare_count is already zero when |
521 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 522 | */ |
9b83ccd2 RW |
523 | if (dev->wakeup.prepare_count < 0) |
524 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 525 | |
9b83ccd2 RW |
526 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
527 | if (err) | |
528 | goto out; | |
1da177e4 LT |
529 | |
530 | /* Close power resource */ | |
531 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
36237fa0 | 532 | int ret = acpi_power_off(dev->wakeup.resources.handles[i]); |
1da177e4 | 533 | if (ret) { |
6468463a | 534 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 535 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
536 | err = -ENODEV; |
537 | goto out; | |
1da177e4 LT |
538 | } |
539 | } | |
540 | ||
9b83ccd2 RW |
541 | out: |
542 | mutex_unlock(&acpi_device_lock); | |
543 | return err; | |
1da177e4 LT |
544 | } |
545 | ||
32a00d27 | 546 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 547 | { |
4be44fcd LB |
548 | int result = 0; |
549 | struct acpi_handle_list *list = NULL; | |
550 | int list_state = 0; | |
551 | int i = 0; | |
1da177e4 | 552 | |
32a00d27 | 553 | if (!device || !state) |
d550d98d | 554 | return -EINVAL; |
1da177e4 | 555 | |
1da177e4 LT |
556 | /* |
557 | * We know a device's inferred power state when all the resources | |
558 | * required for a given D-state are 'on'. | |
559 | */ | |
38c92fff | 560 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
1da177e4 LT |
561 | list = &device->power.states[i].resources; |
562 | if (list->count < 1) | |
563 | continue; | |
564 | ||
565 | result = acpi_power_get_list_state(list, &list_state); | |
566 | if (result) | |
d550d98d | 567 | return result; |
1da177e4 LT |
568 | |
569 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 570 | *state = i; |
d550d98d | 571 | return 0; |
1da177e4 LT |
572 | } |
573 | } | |
574 | ||
32a00d27 | 575 | *state = ACPI_STATE_D3; |
d550d98d | 576 | return 0; |
1da177e4 LT |
577 | } |
578 | ||
30d3df41 RW |
579 | int acpi_power_on_resources(struct acpi_device *device, int state) |
580 | { | |
581 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3) | |
582 | return -EINVAL; | |
583 | ||
584 | return acpi_power_on_list(&device->power.states[state].resources); | |
585 | } | |
586 | ||
4be44fcd | 587 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 588 | { |
5c7dd710 | 589 | int result = 0; |
1da177e4 | 590 | |
3ebc81b8 | 591 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 592 | return -EINVAL; |
1da177e4 | 593 | |
212967c6 RW |
594 | if (device->power.state == state) |
595 | return 0; | |
596 | ||
4be44fcd | 597 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 598 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 599 | return -ENODEV; |
1da177e4 | 600 | |
1da177e4 LT |
601 | /* TBD: Resources must be ordered. */ |
602 | ||
603 | /* | |
604 | * First we reference all power resources required in the target list | |
d2ef555b RW |
605 | * (e.g. so the device doesn't lose power while transitioning). Then, |
606 | * we dereference all power resources used in the current list. | |
1da177e4 | 607 | */ |
5c7dd710 RW |
608 | if (state < ACPI_STATE_D3_COLD) |
609 | result = acpi_power_on_list( | |
610 | &device->power.states[state].resources); | |
611 | ||
612 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
613 | acpi_power_off_list( |
614 | &device->power.states[device->power.state].resources); | |
1da177e4 | 615 | |
d2ef555b RW |
616 | /* We shouldn't change the state unless the above operations succeed. */ |
617 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 618 | |
d550d98d | 619 | return result; |
1da177e4 LT |
620 | } |
621 | ||
82c7d5ef RW |
622 | static void acpi_release_power_resource(struct device *dev) |
623 | { | |
624 | struct acpi_device *device = to_acpi_device(dev); | |
625 | struct acpi_power_resource *resource; | |
626 | ||
82c7d5ef | 627 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
628 | |
629 | mutex_lock(&power_resource_list_lock); | |
630 | list_del(&resource->list_node); | |
631 | mutex_unlock(&power_resource_list_lock); | |
632 | ||
633 | acpi_free_ids(device); | |
82c7d5ef RW |
634 | kfree(resource); |
635 | } | |
1da177e4 | 636 | |
82c7d5ef | 637 | void acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 638 | { |
82c7d5ef RW |
639 | struct acpi_power_resource *resource; |
640 | struct acpi_device *device = NULL; | |
4be44fcd LB |
641 | union acpi_object acpi_object; |
642 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
643 | acpi_status status; |
644 | int state, result = -ENODEV; | |
1da177e4 | 645 | |
82c7d5ef RW |
646 | acpi_bus_get_device(handle, &device); |
647 | if (device) | |
648 | return; | |
1da177e4 | 649 | |
82c7d5ef | 650 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 651 | if (!resource) |
82c7d5ef | 652 | return; |
1da177e4 | 653 | |
82c7d5ef RW |
654 | device = &resource->device; |
655 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
656 | ACPI_STA_DEFAULT); | |
0a613902 | 657 | mutex_init(&resource->resource_lock); |
bc9b6407 | 658 | INIT_LIST_HEAD(&resource->dependent); |
82c7d5ef | 659 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
660 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
661 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
1da177e4 LT |
662 | |
663 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
664 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
665 | if (ACPI_FAILURE(status)) | |
781d737c | 666 | goto err; |
82c7d5ef | 667 | |
1da177e4 LT |
668 | resource->system_level = acpi_object.power_resource.system_level; |
669 | resource->order = acpi_object.power_resource.resource_order; | |
670 | ||
82c7d5ef | 671 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 672 | if (result) |
781d737c | 673 | goto err; |
1da177e4 | 674 | |
c35923bc | 675 | switch (state) { |
1da177e4 LT |
676 | case ACPI_POWER_RESOURCE_STATE_ON: |
677 | device->power.state = ACPI_STATE_D0; | |
678 | break; | |
679 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
680 | device->power.state = ACPI_STATE_D3; | |
681 | break; | |
682 | default: | |
683 | device->power.state = ACPI_STATE_UNKNOWN; | |
1da177e4 LT |
684 | } |
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 |