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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> |
18a38709 | 44 | #include <linux/sysfs.h> |
1da177e4 LT |
45 | #include <acpi/acpi_bus.h> |
46 | #include <acpi/acpi_drivers.h> | |
9b83ccd2 | 47 | #include "sleep.h" |
0090def6 | 48 | #include "internal.h" |
9b83ccd2 | 49 | |
a192a958 LB |
50 | #define PREFIX "ACPI: " |
51 | ||
89595b8f | 52 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 53 | ACPI_MODULE_NAME("power"); |
1da177e4 | 54 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 LT |
55 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
56 | #define ACPI_POWER_FILE_INFO "info" | |
57 | #define ACPI_POWER_FILE_STATUS "state" | |
58 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
59 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
60 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 61 | |
bc9b6407 RW |
62 | struct acpi_power_dependent_device { |
63 | struct list_head node; | |
64 | struct acpi_device *adev; | |
65 | struct work_struct work; | |
0090def6 LM |
66 | }; |
67 | ||
4be44fcd | 68 | struct acpi_power_resource { |
82c7d5ef | 69 | struct acpi_device device; |
781d737c | 70 | struct list_head list_node; |
bc9b6407 | 71 | struct list_head dependent; |
82c7d5ef | 72 | char *name; |
4be44fcd LB |
73 | u32 system_level; |
74 | u32 order; | |
3e384ee6 | 75 | unsigned int ref_count; |
b5d667eb | 76 | bool wakeup_enabled; |
0a613902 | 77 | struct mutex resource_lock; |
1da177e4 LT |
78 | }; |
79 | ||
0b224527 RW |
80 | struct acpi_power_resource_entry { |
81 | struct list_head node; | |
82 | struct acpi_power_resource *resource; | |
83 | }; | |
84 | ||
781d737c RW |
85 | static LIST_HEAD(acpi_power_resource_list); |
86 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 87 | |
1da177e4 LT |
88 | /* -------------------------------------------------------------------------- |
89 | Power Resource Management | |
90 | -------------------------------------------------------------------------- */ | |
91 | ||
b1c0f99b RW |
92 | static inline |
93 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
94 | { | |
95 | return container_of(device, struct acpi_power_resource, device); | |
96 | } | |
97 | ||
82c7d5ef | 98 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 99 | { |
82c7d5ef | 100 | struct acpi_device *device; |
1da177e4 | 101 | |
82c7d5ef RW |
102 | if (acpi_bus_get_device(handle, &device)) |
103 | return NULL; | |
1da177e4 | 104 | |
b1c0f99b | 105 | return to_power_resource(device); |
1da177e4 LT |
106 | } |
107 | ||
e88c9c60 RW |
108 | static int acpi_power_resources_list_add(acpi_handle handle, |
109 | struct list_head *list) | |
0b224527 RW |
110 | { |
111 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
112 | struct acpi_power_resource_entry *entry; | |
113 | ||
114 | if (!resource || !list) | |
e88c9c60 | 115 | return -EINVAL; |
0b224527 RW |
116 | |
117 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
118 | if (!entry) | |
e88c9c60 | 119 | return -ENOMEM; |
0b224527 RW |
120 | |
121 | entry->resource = resource; | |
122 | if (!list_empty(list)) { | |
123 | struct acpi_power_resource_entry *e; | |
124 | ||
125 | list_for_each_entry(e, list, node) | |
126 | if (e->resource->order > resource->order) { | |
127 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 128 | return 0; |
0b224527 RW |
129 | } |
130 | } | |
131 | list_add_tail(&entry->node, list); | |
e88c9c60 | 132 | return 0; |
0b224527 RW |
133 | } |
134 | ||
135 | void acpi_power_resources_list_free(struct list_head *list) | |
136 | { | |
137 | struct acpi_power_resource_entry *entry, *e; | |
138 | ||
139 | list_for_each_entry_safe(entry, e, list, node) { | |
140 | list_del(&entry->node); | |
141 | kfree(entry); | |
142 | } | |
143 | } | |
144 | ||
e88c9c60 RW |
145 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
146 | struct list_head *list) | |
ef85bdbe | 147 | { |
ef85bdbe | 148 | unsigned int i; |
e88c9c60 | 149 | int err = 0; |
ef85bdbe RW |
150 | |
151 | for (i = start; i < package->package.count; i++) { | |
152 | union acpi_object *element = &package->package.elements[i]; | |
153 | acpi_handle rhandle; | |
154 | ||
155 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 156 | err = -ENODATA; |
ef85bdbe RW |
157 | break; |
158 | } | |
159 | rhandle = element->reference.handle; | |
160 | if (!rhandle) { | |
e88c9c60 | 161 | err = -ENODEV; |
ef85bdbe RW |
162 | break; |
163 | } | |
e88c9c60 RW |
164 | err = acpi_add_power_resource(rhandle); |
165 | if (err) | |
166 | break; | |
167 | ||
168 | err = acpi_power_resources_list_add(rhandle, list); | |
169 | if (err) | |
170 | break; | |
ef85bdbe | 171 | } |
e88c9c60 | 172 | if (err) |
ef85bdbe RW |
173 | acpi_power_resources_list_free(list); |
174 | ||
e88c9c60 | 175 | return err; |
ef85bdbe RW |
176 | } |
177 | ||
a51e145f | 178 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 179 | { |
4be44fcd | 180 | acpi_status status = AE_OK; |
27663c58 | 181 | unsigned long long sta = 0; |
60a4ce7f LM |
182 | char node_name[5]; |
183 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 184 | |
1da177e4 | 185 | |
a51e145f | 186 | if (!handle || !state) |
d550d98d | 187 | return -EINVAL; |
1da177e4 | 188 | |
a51e145f | 189 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 190 | if (ACPI_FAILURE(status)) |
d550d98d | 191 | return -ENODEV; |
1da177e4 | 192 | |
c35923bc AS |
193 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
194 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 195 | |
60a4ce7f LM |
196 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
197 | ||
1da177e4 | 198 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 199 | node_name, |
b1b57fbe | 200 | *state ? "on" : "off")); |
1da177e4 | 201 | |
d550d98d | 202 | return 0; |
1da177e4 LT |
203 | } |
204 | ||
0b224527 | 205 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 206 | { |
0b224527 | 207 | struct acpi_power_resource_entry *entry; |
d0515d9f | 208 | int cur_state; |
1da177e4 LT |
209 | |
210 | if (!list || !state) | |
d550d98d | 211 | return -EINVAL; |
1da177e4 LT |
212 | |
213 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
1812b5ca | 214 | cur_state = 0; |
0b224527 RW |
215 | list_for_each_entry(entry, list, node) { |
216 | struct acpi_power_resource *resource = entry->resource; | |
217 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
218 | int result; |
219 | ||
d0515d9f | 220 | mutex_lock(&resource->resource_lock); |
d0515d9f | 221 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 222 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
223 | if (result) |
224 | return result; | |
225 | ||
226 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
227 | break; |
228 | } | |
229 | ||
230 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 231 | cur_state ? "on" : "off")); |
1da177e4 | 232 | |
d0515d9f | 233 | *state = cur_state; |
d0515d9f | 234 | return 0; |
1da177e4 LT |
235 | } |
236 | ||
bc9b6407 | 237 | static void acpi_power_resume_dependent(struct work_struct *work) |
0090def6 | 238 | { |
bc9b6407 RW |
239 | struct acpi_power_dependent_device *dep; |
240 | struct acpi_device_physical_node *pn; | |
241 | struct acpi_device *adev; | |
0090def6 LM |
242 | int state; |
243 | ||
bc9b6407 RW |
244 | dep = container_of(work, struct acpi_power_dependent_device, work); |
245 | adev = dep->adev; | |
246 | if (acpi_power_get_inferred_state(adev, &state)) | |
0090def6 LM |
247 | return; |
248 | ||
bc9b6407 | 249 | if (state > ACPI_STATE_D0) |
0090def6 LM |
250 | return; |
251 | ||
bc9b6407 RW |
252 | mutex_lock(&adev->physical_node_lock); |
253 | ||
254 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
255 | pm_request_resume(pn->dev); | |
256 | ||
257 | list_for_each_entry(pn, &adev->power_dependent, node) | |
258 | pm_request_resume(pn->dev); | |
259 | ||
260 | mutex_unlock(&adev->physical_node_lock); | |
0090def6 LM |
261 | } |
262 | ||
3e384ee6 | 263 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 264 | { |
4be44fcd | 265 | acpi_status status = AE_OK; |
1da177e4 | 266 | |
82c7d5ef | 267 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
268 | if (ACPI_FAILURE(status)) |
269 | return -ENODEV; | |
270 | ||
3e384ee6 RW |
271 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
272 | resource->name)); | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
b5d667eb | 277 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 278 | { |
b5d667eb | 279 | int result = 0; |
0a613902 | 280 | |
3e384ee6 RW |
281 | if (resource->ref_count++) { |
282 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
283 | "Power resource [%s] already on", | |
284 | resource->name)); | |
285 | } else { | |
286 | result = __acpi_power_on(resource); | |
bc9b6407 | 287 | if (result) { |
12b3b5af | 288 | resource->ref_count--; |
bc9b6407 RW |
289 | } else { |
290 | struct acpi_power_dependent_device *dep; | |
40bf66ec | 291 | |
bc9b6407 RW |
292 | list_for_each_entry(dep, &resource->dependent, node) |
293 | schedule_work(&dep->work); | |
294 | } | |
40bf66ec | 295 | } |
b5d667eb RW |
296 | return result; |
297 | } | |
40bf66ec | 298 | |
b5d667eb RW |
299 | static int acpi_power_on(struct acpi_power_resource *resource) |
300 | { | |
301 | int result; | |
40bf66ec | 302 | |
b5d667eb RW |
303 | mutex_lock(&resource->resource_lock); |
304 | result = acpi_power_on_unlocked(resource); | |
305 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 306 | return result; |
1da177e4 LT |
307 | } |
308 | ||
660b1113 RW |
309 | static int __acpi_power_off(struct acpi_power_resource *resource) |
310 | { | |
311 | acpi_status status; | |
312 | ||
313 | status = acpi_evaluate_object(resource->device.handle, "_OFF", | |
314 | NULL, NULL); | |
315 | if (ACPI_FAILURE(status)) | |
316 | return -ENODEV; | |
317 | ||
318 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n", | |
319 | resource->name)); | |
320 | return 0; | |
321 | } | |
322 | ||
b5d667eb | 323 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 324 | { |
0b224527 | 325 | int result = 0; |
1da177e4 | 326 | |
3e384ee6 RW |
327 | if (!resource->ref_count) { |
328 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
329 | "Power resource [%s] already off", | |
330 | resource->name)); | |
b5d667eb | 331 | return 0; |
0a613902 | 332 | } |
1da177e4 | 333 | |
3e384ee6 RW |
334 | if (--resource->ref_count) { |
335 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
336 | "Power resource [%s] still in use\n", | |
337 | resource->name)); | |
660b1113 RW |
338 | } else { |
339 | result = __acpi_power_off(resource); | |
340 | if (result) | |
341 | resource->ref_count++; | |
1da177e4 | 342 | } |
b5d667eb RW |
343 | return result; |
344 | } | |
1da177e4 | 345 | |
b5d667eb RW |
346 | static int acpi_power_off(struct acpi_power_resource *resource) |
347 | { | |
348 | int result; | |
1da177e4 | 349 | |
b5d667eb RW |
350 | mutex_lock(&resource->resource_lock); |
351 | result = acpi_power_off_unlocked(resource); | |
352 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 353 | return result; |
1da177e4 LT |
354 | } |
355 | ||
0b224527 | 356 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 357 | { |
0b224527 RW |
358 | struct acpi_power_resource_entry *entry; |
359 | int result = 0; | |
d2ef555b | 360 | |
0b224527 RW |
361 | list_for_each_entry_reverse(entry, list, node) { |
362 | result = acpi_power_off(entry->resource); | |
363 | if (result) | |
364 | goto err; | |
365 | } | |
366 | return 0; | |
d2ef555b | 367 | |
0b224527 RW |
368 | err: |
369 | list_for_each_entry_continue(entry, list, node) | |
370 | acpi_power_on(entry->resource); | |
371 | ||
372 | return result; | |
d2ef555b RW |
373 | } |
374 | ||
0b224527 | 375 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 376 | { |
0b224527 | 377 | struct acpi_power_resource_entry *entry; |
d2ef555b | 378 | int result = 0; |
d2ef555b | 379 | |
0b224527 RW |
380 | list_for_each_entry(entry, list, node) { |
381 | result = acpi_power_on(entry->resource); | |
382 | if (result) | |
383 | goto err; | |
d2ef555b | 384 | } |
0b224527 RW |
385 | return 0; |
386 | ||
387 | err: | |
388 | list_for_each_entry_continue_reverse(entry, list, node) | |
389 | acpi_power_off(entry->resource); | |
d2ef555b RW |
390 | |
391 | return result; | |
392 | } | |
393 | ||
0b224527 | 394 | static void acpi_power_add_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 395 | struct acpi_device *adev) |
0090def6 | 396 | { |
bc9b6407 | 397 | struct acpi_power_dependent_device *dep; |
0090def6 | 398 | |
bc9b6407 | 399 | mutex_lock(&resource->resource_lock); |
0090def6 | 400 | |
bc9b6407 RW |
401 | list_for_each_entry(dep, &resource->dependent, node) |
402 | if (dep->adev == adev) | |
403 | goto out; | |
0090def6 | 404 | |
bc9b6407 RW |
405 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
406 | if (!dep) | |
407 | goto out; | |
0090def6 | 408 | |
bc9b6407 RW |
409 | dep->adev = adev; |
410 | INIT_WORK(&dep->work, acpi_power_resume_dependent); | |
411 | list_add_tail(&dep->node, &resource->dependent); | |
0090def6 | 412 | |
bc9b6407 RW |
413 | out: |
414 | mutex_unlock(&resource->resource_lock); | |
0090def6 LM |
415 | } |
416 | ||
0b224527 | 417 | static void acpi_power_remove_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 418 | struct acpi_device *adev) |
0090def6 | 419 | { |
bc9b6407 | 420 | struct acpi_power_dependent_device *dep; |
bc9b6407 | 421 | struct work_struct *work = NULL; |
0090def6 | 422 | |
bc9b6407 | 423 | mutex_lock(&resource->resource_lock); |
0090def6 | 424 | |
bc9b6407 RW |
425 | list_for_each_entry(dep, &resource->dependent, node) |
426 | if (dep->adev == adev) { | |
427 | list_del(&dep->node); | |
428 | work = &dep->work; | |
429 | break; | |
430 | } | |
0090def6 | 431 | |
bc9b6407 | 432 | mutex_unlock(&resource->resource_lock); |
0090def6 | 433 | |
bc9b6407 RW |
434 | if (work) { |
435 | cancel_work_sync(work); | |
436 | kfree(dep); | |
437 | } | |
0090def6 LM |
438 | } |
439 | ||
18a38709 RW |
440 | static struct attribute *attrs[] = { |
441 | NULL, | |
442 | }; | |
443 | ||
444 | static struct attribute_group attr_groups[] = { | |
445 | [ACPI_STATE_D0] = { | |
446 | .name = "power_resources_D0", | |
447 | .attrs = attrs, | |
448 | }, | |
449 | [ACPI_STATE_D1] = { | |
450 | .name = "power_resources_D1", | |
451 | .attrs = attrs, | |
452 | }, | |
453 | [ACPI_STATE_D2] = { | |
454 | .name = "power_resources_D2", | |
455 | .attrs = attrs, | |
456 | }, | |
457 | [ACPI_STATE_D3_HOT] = { | |
458 | .name = "power_resources_D3hot", | |
459 | .attrs = attrs, | |
460 | }, | |
461 | }; | |
462 | ||
41a2a466 RW |
463 | static struct attribute_group wakeup_attr_group = { |
464 | .name = "power_resources_wakeup", | |
465 | .attrs = attrs, | |
466 | }; | |
467 | ||
468 | static void acpi_power_hide_list(struct acpi_device *adev, | |
469 | struct list_head *resources, | |
470 | struct attribute_group *attr_group) | |
18a38709 | 471 | { |
18a38709 RW |
472 | struct acpi_power_resource_entry *entry; |
473 | ||
41a2a466 | 474 | if (list_empty(resources)) |
18a38709 RW |
475 | return; |
476 | ||
41a2a466 | 477 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
478 | struct acpi_device *res_dev = &entry->resource->device; |
479 | ||
480 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 481 | attr_group->name, |
18a38709 RW |
482 | dev_name(&res_dev->dev)); |
483 | } | |
41a2a466 | 484 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
485 | } |
486 | ||
41a2a466 RW |
487 | static void acpi_power_expose_list(struct acpi_device *adev, |
488 | struct list_head *resources, | |
489 | struct attribute_group *attr_group) | |
0090def6 | 490 | { |
18a38709 RW |
491 | struct acpi_power_resource_entry *entry; |
492 | int ret; | |
493 | ||
41a2a466 | 494 | if (list_empty(resources)) |
18a38709 RW |
495 | return; |
496 | ||
41a2a466 | 497 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
498 | if (ret) |
499 | return; | |
500 | ||
41a2a466 | 501 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
502 | struct acpi_device *res_dev = &entry->resource->device; |
503 | ||
504 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 505 | attr_group->name, |
18a38709 RW |
506 | &res_dev->dev.kobj, |
507 | dev_name(&res_dev->dev)); | |
508 | if (ret) { | |
41a2a466 | 509 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 510 | break; |
0090def6 LM |
511 | } |
512 | } | |
0090def6 | 513 | } |
bc9b6407 | 514 | |
41a2a466 RW |
515 | static void acpi_power_expose_hide(struct acpi_device *adev, |
516 | struct list_head *resources, | |
517 | struct attribute_group *attr_group, | |
518 | bool expose) | |
519 | { | |
520 | if (expose) | |
521 | acpi_power_expose_list(adev, resources, attr_group); | |
522 | else | |
523 | acpi_power_hide_list(adev, resources, attr_group); | |
524 | } | |
525 | ||
18a38709 RW |
526 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
527 | { | |
528 | struct acpi_device_power_state *ps; | |
529 | struct acpi_power_resource_entry *entry; | |
530 | int state; | |
531 | ||
41a2a466 RW |
532 | if (adev->wakeup.flags.valid) |
533 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
534 | &wakeup_attr_group, add); | |
535 | ||
18a38709 RW |
536 | if (!adev->power.flags.power_resources) |
537 | return; | |
538 | ||
539 | ps = &adev->power.states[ACPI_STATE_D0]; | |
540 | list_for_each_entry(entry, &ps->resources, node) { | |
541 | struct acpi_power_resource *resource = entry->resource; | |
542 | ||
543 | if (add) | |
544 | acpi_power_add_dependent(resource, adev); | |
545 | else | |
546 | acpi_power_remove_dependent(resource, adev); | |
547 | } | |
548 | ||
41a2a466 RW |
549 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
550 | acpi_power_expose_hide(adev, | |
551 | &adev->power.states[state].resources, | |
552 | &attr_groups[state], add); | |
18a38709 RW |
553 | } |
554 | ||
b5d667eb | 555 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
556 | { |
557 | struct acpi_power_resource_entry *entry; | |
558 | int system_level = 5; | |
559 | ||
560 | list_for_each_entry(entry, list, node) { | |
561 | struct acpi_power_resource *resource = entry->resource; | |
b5d667eb RW |
562 | acpi_handle handle = resource->device.handle; |
563 | int result; | |
564 | int state; | |
0596a52b | 565 | |
b5d667eb RW |
566 | mutex_lock(&resource->resource_lock); |
567 | ||
568 | result = acpi_power_get_state(handle, &state); | |
569 | if (result) { | |
570 | mutex_unlock(&resource->resource_lock); | |
571 | return result; | |
572 | } | |
573 | if (state == ACPI_POWER_RESOURCE_STATE_ON) { | |
574 | resource->ref_count++; | |
575 | resource->wakeup_enabled = true; | |
576 | } | |
0596a52b RW |
577 | if (system_level > resource->system_level) |
578 | system_level = resource->system_level; | |
b5d667eb RW |
579 | |
580 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 581 | } |
b5d667eb RW |
582 | *system_level_p = system_level; |
583 | return 0; | |
0596a52b RW |
584 | } |
585 | ||
bc9b6407 RW |
586 | /* -------------------------------------------------------------------------- |
587 | Device Power Management | |
588 | -------------------------------------------------------------------------- */ | |
0090def6 | 589 | |
77e76609 RW |
590 | /** |
591 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
592 | * ACPI 3.0) _PSW (Power State Wake) | |
593 | * @dev: Device to handle. | |
594 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
595 | * @sleep_state: Target sleep state of the system. | |
596 | * @dev_state: Target power state of the device. | |
597 | * | |
598 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
599 | * State Wake) for the device, if present. On failure reset the device's | |
600 | * wakeup.flags.valid flag. | |
601 | * | |
602 | * RETURN VALUE: | |
603 | * 0 if either _DSW or _PSW has been successfully executed | |
604 | * 0 if neither _DSW nor _PSW has been found | |
605 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
606 | */ | |
607 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
608 | int enable, int sleep_state, int dev_state) | |
609 | { | |
610 | union acpi_object in_arg[3]; | |
611 | struct acpi_object_list arg_list = { 3, in_arg }; | |
612 | acpi_status status = AE_OK; | |
613 | ||
614 | /* | |
615 | * Try to execute _DSW first. | |
616 | * | |
617 | * Three agruments are needed for the _DSW object: | |
618 | * Argument 0: enable/disable the wake capabilities | |
619 | * Argument 1: target system state | |
620 | * Argument 2: target device state | |
621 | * When _DSW object is called to disable the wake capabilities, maybe | |
622 | * the first argument is filled. The values of the other two agruments | |
623 | * are meaningless. | |
624 | */ | |
625 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
626 | in_arg[0].integer.value = enable; | |
627 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
628 | in_arg[1].integer.value = sleep_state; | |
629 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
630 | in_arg[2].integer.value = dev_state; | |
631 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
632 | if (ACPI_SUCCESS(status)) { | |
633 | return 0; | |
634 | } else if (status != AE_NOT_FOUND) { | |
635 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
636 | dev->wakeup.flags.valid = 0; | |
637 | return -ENODEV; | |
638 | } | |
639 | ||
640 | /* Execute _PSW */ | |
641 | arg_list.count = 1; | |
642 | in_arg[0].integer.value = enable; | |
643 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
644 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
645 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
646 | dev->wakeup.flags.valid = 0; | |
647 | return -ENODEV; | |
648 | } | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
1da177e4 LT |
653 | /* |
654 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
655 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
656 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
657 | * State Wake) for the device, if present | |
1da177e4 | 658 | */ |
77e76609 | 659 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 660 | { |
b5d667eb | 661 | struct acpi_power_resource_entry *entry; |
993cbe59 | 662 | int err = 0; |
1da177e4 | 663 | |
1da177e4 | 664 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 665 | return -EINVAL; |
1da177e4 | 666 | |
9b83ccd2 RW |
667 | mutex_lock(&acpi_device_lock); |
668 | ||
669 | if (dev->wakeup.prepare_count++) | |
670 | goto out; | |
0af4b8c4 | 671 | |
b5d667eb RW |
672 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
673 | struct acpi_power_resource *resource = entry->resource; | |
674 | ||
675 | mutex_lock(&resource->resource_lock); | |
676 | ||
677 | if (!resource->wakeup_enabled) { | |
678 | err = acpi_power_on_unlocked(resource); | |
679 | if (!err) | |
680 | resource->wakeup_enabled = true; | |
681 | } | |
682 | ||
683 | mutex_unlock(&resource->resource_lock); | |
684 | ||
685 | if (err) { | |
686 | dev_err(&dev->dev, | |
687 | "Cannot turn wakeup power resources on\n"); | |
688 | dev->wakeup.flags.valid = 0; | |
689 | goto out; | |
690 | } | |
1da177e4 | 691 | } |
b5d667eb RW |
692 | /* |
693 | * Passing 3 as the third argument below means the device may be | |
694 | * put into arbitrary power state afterward. | |
695 | */ | |
696 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
9b83ccd2 RW |
697 | if (err) |
698 | dev->wakeup.prepare_count = 0; | |
699 | ||
700 | out: | |
701 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 702 | return err; |
1da177e4 LT |
703 | } |
704 | ||
705 | /* | |
706 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
707 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
708 | * State Wake) for the device, if present | |
1da177e4 LT |
709 | * 2. Shutdown down the power resources |
710 | */ | |
4be44fcd | 711 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 712 | { |
b5d667eb | 713 | struct acpi_power_resource_entry *entry; |
993cbe59 | 714 | int err = 0; |
1da177e4 LT |
715 | |
716 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 717 | return -EINVAL; |
1da177e4 | 718 | |
9b83ccd2 RW |
719 | mutex_lock(&acpi_device_lock); |
720 | ||
721 | if (--dev->wakeup.prepare_count > 0) | |
722 | goto out; | |
723 | ||
0af4b8c4 | 724 | /* |
9b83ccd2 RW |
725 | * Executing the code below even if prepare_count is already zero when |
726 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 727 | */ |
9b83ccd2 RW |
728 | if (dev->wakeup.prepare_count < 0) |
729 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 730 | |
9b83ccd2 RW |
731 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
732 | if (err) | |
733 | goto out; | |
1da177e4 | 734 | |
b5d667eb RW |
735 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
736 | struct acpi_power_resource *resource = entry->resource; | |
737 | ||
738 | mutex_lock(&resource->resource_lock); | |
739 | ||
740 | if (resource->wakeup_enabled) { | |
741 | err = acpi_power_off_unlocked(resource); | |
742 | if (!err) | |
743 | resource->wakeup_enabled = false; | |
744 | } | |
745 | ||
746 | mutex_unlock(&resource->resource_lock); | |
747 | ||
748 | if (err) { | |
749 | dev_err(&dev->dev, | |
750 | "Cannot turn wakeup power resources off\n"); | |
751 | dev->wakeup.flags.valid = 0; | |
752 | break; | |
753 | } | |
1da177e4 LT |
754 | } |
755 | ||
9b83ccd2 RW |
756 | out: |
757 | mutex_unlock(&acpi_device_lock); | |
758 | return err; | |
1da177e4 LT |
759 | } |
760 | ||
32a00d27 | 761 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 762 | { |
4be44fcd | 763 | int result = 0; |
4be44fcd LB |
764 | int list_state = 0; |
765 | int i = 0; | |
1da177e4 | 766 | |
32a00d27 | 767 | if (!device || !state) |
d550d98d | 768 | return -EINVAL; |
1da177e4 | 769 | |
1da177e4 LT |
770 | /* |
771 | * We know a device's inferred power state when all the resources | |
772 | * required for a given D-state are 'on'. | |
773 | */ | |
38c92fff | 774 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
775 | struct list_head *list = &device->power.states[i].resources; |
776 | ||
777 | if (list_empty(list)) | |
1da177e4 LT |
778 | continue; |
779 | ||
780 | result = acpi_power_get_list_state(list, &list_state); | |
781 | if (result) | |
d550d98d | 782 | return result; |
1da177e4 LT |
783 | |
784 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 785 | *state = i; |
d550d98d | 786 | return 0; |
1da177e4 LT |
787 | } |
788 | } | |
789 | ||
32a00d27 | 790 | *state = ACPI_STATE_D3; |
d550d98d | 791 | return 0; |
1da177e4 LT |
792 | } |
793 | ||
30d3df41 RW |
794 | int acpi_power_on_resources(struct acpi_device *device, int state) |
795 | { | |
87e753b0 | 796 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
797 | return -EINVAL; |
798 | ||
799 | return acpi_power_on_list(&device->power.states[state].resources); | |
800 | } | |
801 | ||
4be44fcd | 802 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 803 | { |
5c7dd710 | 804 | int result = 0; |
1da177e4 | 805 | |
3ebc81b8 | 806 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 807 | return -EINVAL; |
1da177e4 | 808 | |
0b224527 | 809 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
810 | return 0; |
811 | ||
4be44fcd | 812 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 813 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 814 | return -ENODEV; |
1da177e4 | 815 | |
1da177e4 LT |
816 | /* TBD: Resources must be ordered. */ |
817 | ||
818 | /* | |
819 | * First we reference all power resources required in the target list | |
d2ef555b RW |
820 | * (e.g. so the device doesn't lose power while transitioning). Then, |
821 | * we dereference all power resources used in the current list. | |
1da177e4 | 822 | */ |
5c7dd710 RW |
823 | if (state < ACPI_STATE_D3_COLD) |
824 | result = acpi_power_on_list( | |
825 | &device->power.states[state].resources); | |
826 | ||
827 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
828 | acpi_power_off_list( |
829 | &device->power.states[device->power.state].resources); | |
1da177e4 | 830 | |
d2ef555b RW |
831 | /* We shouldn't change the state unless the above operations succeed. */ |
832 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 833 | |
d550d98d | 834 | return result; |
1da177e4 LT |
835 | } |
836 | ||
82c7d5ef RW |
837 | static void acpi_release_power_resource(struct device *dev) |
838 | { | |
839 | struct acpi_device *device = to_acpi_device(dev); | |
840 | struct acpi_power_resource *resource; | |
841 | ||
82c7d5ef | 842 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
843 | |
844 | mutex_lock(&power_resource_list_lock); | |
845 | list_del(&resource->list_node); | |
846 | mutex_unlock(&power_resource_list_lock); | |
847 | ||
c0af4175 | 848 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
849 | kfree(resource); |
850 | } | |
1da177e4 | 851 | |
b1c0f99b RW |
852 | static ssize_t acpi_power_in_use_show(struct device *dev, |
853 | struct device_attribute *attr, | |
854 | char *buf) { | |
855 | struct acpi_power_resource *resource; | |
856 | ||
857 | resource = to_power_resource(to_acpi_device(dev)); | |
858 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
859 | } | |
860 | static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL); | |
861 | ||
862 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
863 | { | |
864 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
865 | } | |
866 | ||
e88c9c60 | 867 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 868 | { |
82c7d5ef RW |
869 | struct acpi_power_resource *resource; |
870 | struct acpi_device *device = NULL; | |
4be44fcd LB |
871 | union acpi_object acpi_object; |
872 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
873 | acpi_status status; |
874 | int state, result = -ENODEV; | |
1da177e4 | 875 | |
82c7d5ef RW |
876 | acpi_bus_get_device(handle, &device); |
877 | if (device) | |
e88c9c60 | 878 | return 0; |
1da177e4 | 879 | |
82c7d5ef | 880 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 881 | if (!resource) |
e88c9c60 | 882 | return -ENOMEM; |
1da177e4 | 883 | |
82c7d5ef RW |
884 | device = &resource->device; |
885 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
886 | ACPI_STA_DEFAULT); | |
0a613902 | 887 | mutex_init(&resource->resource_lock); |
bc9b6407 | 888 | INIT_LIST_HEAD(&resource->dependent); |
6ee22e9d | 889 | INIT_LIST_HEAD(&resource->list_node); |
82c7d5ef | 890 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
891 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
892 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 893 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
894 | |
895 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
896 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
897 | if (ACPI_FAILURE(status)) | |
781d737c | 898 | goto err; |
82c7d5ef | 899 | |
1da177e4 LT |
900 | resource->system_level = acpi_object.power_resource.system_level; |
901 | resource->order = acpi_object.power_resource.resource_order; | |
902 | ||
82c7d5ef | 903 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 904 | if (result) |
781d737c | 905 | goto err; |
1da177e4 | 906 | |
1da177e4 | 907 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 908 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 909 | |
82c7d5ef | 910 | device->flags.match_driver = true; |
cf860be6 | 911 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 912 | if (result) |
781d737c | 913 | goto err; |
4be44fcd | 914 | |
b1c0f99b RW |
915 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
916 | device->remove = acpi_power_sysfs_remove; | |
917 | ||
781d737c RW |
918 | mutex_lock(&power_resource_list_lock); |
919 | list_add(&resource->list_node, &acpi_power_resource_list); | |
920 | mutex_unlock(&power_resource_list_lock); | |
cf860be6 | 921 | acpi_device_add_finalize(device); |
e88c9c60 | 922 | return 0; |
1da177e4 | 923 | |
781d737c RW |
924 | err: |
925 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 926 | return result; |
781d737c | 927 | } |
1da177e4 | 928 | |
781d737c RW |
929 | #ifdef CONFIG_ACPI_SLEEP |
930 | void acpi_resume_power_resources(void) | |
0a613902 | 931 | { |
3e384ee6 | 932 | struct acpi_power_resource *resource; |
0a613902 | 933 | |
781d737c | 934 | mutex_lock(&power_resource_list_lock); |
0a613902 | 935 | |
781d737c RW |
936 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
937 | int result, state; | |
0a613902 | 938 | |
781d737c | 939 | mutex_lock(&resource->resource_lock); |
0a613902 | 940 | |
781d737c | 941 | result = acpi_power_get_state(resource->device.handle, &state); |
660b1113 RW |
942 | if (result) |
943 | continue; | |
944 | ||
945 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c RW |
946 | && resource->ref_count) { |
947 | dev_info(&resource->device.dev, "Turning ON\n"); | |
948 | __acpi_power_on(resource); | |
660b1113 RW |
949 | } else if (state == ACPI_POWER_RESOURCE_STATE_ON |
950 | && !resource->ref_count) { | |
951 | dev_info(&resource->device.dev, "Turning OFF\n"); | |
952 | __acpi_power_off(resource); | |
781d737c | 953 | } |
0a613902 | 954 | |
781d737c RW |
955 | mutex_unlock(&resource->resource_lock); |
956 | } | |
3e384ee6 | 957 | |
781d737c | 958 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 959 | } |
90692404 | 960 | #endif |