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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'. */ | |
0b224527 RW |
214 | list_for_each_entry(entry, list, node) { |
215 | struct acpi_power_resource *resource = entry->resource; | |
216 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
217 | int result; |
218 | ||
d0515d9f | 219 | mutex_lock(&resource->resource_lock); |
d0515d9f | 220 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 221 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
222 | if (result) |
223 | return result; | |
224 | ||
225 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
226 | break; |
227 | } | |
228 | ||
229 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 230 | cur_state ? "on" : "off")); |
1da177e4 | 231 | |
d0515d9f | 232 | *state = cur_state; |
d0515d9f | 233 | return 0; |
1da177e4 LT |
234 | } |
235 | ||
bc9b6407 | 236 | static void acpi_power_resume_dependent(struct work_struct *work) |
0090def6 | 237 | { |
bc9b6407 RW |
238 | struct acpi_power_dependent_device *dep; |
239 | struct acpi_device_physical_node *pn; | |
240 | struct acpi_device *adev; | |
0090def6 LM |
241 | int state; |
242 | ||
bc9b6407 RW |
243 | dep = container_of(work, struct acpi_power_dependent_device, work); |
244 | adev = dep->adev; | |
245 | if (acpi_power_get_inferred_state(adev, &state)) | |
0090def6 LM |
246 | return; |
247 | ||
bc9b6407 | 248 | if (state > ACPI_STATE_D0) |
0090def6 LM |
249 | return; |
250 | ||
bc9b6407 RW |
251 | mutex_lock(&adev->physical_node_lock); |
252 | ||
253 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
254 | pm_request_resume(pn->dev); | |
255 | ||
256 | list_for_each_entry(pn, &adev->power_dependent, node) | |
257 | pm_request_resume(pn->dev); | |
258 | ||
259 | mutex_unlock(&adev->physical_node_lock); | |
0090def6 LM |
260 | } |
261 | ||
3e384ee6 | 262 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 263 | { |
4be44fcd | 264 | acpi_status status = AE_OK; |
1da177e4 | 265 | |
82c7d5ef | 266 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
267 | if (ACPI_FAILURE(status)) |
268 | return -ENODEV; | |
269 | ||
3e384ee6 RW |
270 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
271 | resource->name)); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
b5d667eb | 276 | static int acpi_power_on_unlocked(struct acpi_power_resource *resource) |
3e384ee6 | 277 | { |
b5d667eb | 278 | int result = 0; |
0a613902 | 279 | |
3e384ee6 RW |
280 | if (resource->ref_count++) { |
281 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 282 | "Power resource [%s] already on\n", |
3e384ee6 RW |
283 | resource->name)); |
284 | } else { | |
285 | result = __acpi_power_on(resource); | |
bc9b6407 | 286 | if (result) { |
12b3b5af | 287 | resource->ref_count--; |
bc9b6407 RW |
288 | } else { |
289 | struct acpi_power_dependent_device *dep; | |
40bf66ec | 290 | |
bc9b6407 RW |
291 | list_for_each_entry(dep, &resource->dependent, node) |
292 | schedule_work(&dep->work); | |
293 | } | |
40bf66ec | 294 | } |
b5d667eb RW |
295 | return result; |
296 | } | |
40bf66ec | 297 | |
b5d667eb RW |
298 | static int acpi_power_on(struct acpi_power_resource *resource) |
299 | { | |
300 | int result; | |
40bf66ec | 301 | |
b5d667eb RW |
302 | mutex_lock(&resource->resource_lock); |
303 | result = acpi_power_on_unlocked(resource); | |
304 | mutex_unlock(&resource->resource_lock); | |
12b3b5af | 305 | return result; |
1da177e4 LT |
306 | } |
307 | ||
660b1113 RW |
308 | static int __acpi_power_off(struct acpi_power_resource *resource) |
309 | { | |
310 | acpi_status status; | |
311 | ||
312 | status = acpi_evaluate_object(resource->device.handle, "_OFF", | |
313 | NULL, NULL); | |
314 | if (ACPI_FAILURE(status)) | |
315 | return -ENODEV; | |
316 | ||
317 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n", | |
318 | resource->name)); | |
319 | return 0; | |
320 | } | |
321 | ||
b5d667eb | 322 | static int acpi_power_off_unlocked(struct acpi_power_resource *resource) |
1da177e4 | 323 | { |
0b224527 | 324 | int result = 0; |
1da177e4 | 325 | |
3e384ee6 RW |
326 | if (!resource->ref_count) { |
327 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
10a0b617 | 328 | "Power resource [%s] already off\n", |
3e384ee6 | 329 | resource->name)); |
b5d667eb | 330 | return 0; |
0a613902 | 331 | } |
1da177e4 | 332 | |
3e384ee6 RW |
333 | if (--resource->ref_count) { |
334 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
335 | "Power resource [%s] still in use\n", | |
336 | resource->name)); | |
660b1113 RW |
337 | } else { |
338 | result = __acpi_power_off(resource); | |
339 | if (result) | |
340 | resource->ref_count++; | |
1da177e4 | 341 | } |
b5d667eb RW |
342 | return result; |
343 | } | |
1da177e4 | 344 | |
b5d667eb RW |
345 | static int acpi_power_off(struct acpi_power_resource *resource) |
346 | { | |
347 | int result; | |
1da177e4 | 348 | |
b5d667eb RW |
349 | mutex_lock(&resource->resource_lock); |
350 | result = acpi_power_off_unlocked(resource); | |
351 | mutex_unlock(&resource->resource_lock); | |
3e384ee6 | 352 | return result; |
1da177e4 LT |
353 | } |
354 | ||
0b224527 | 355 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 356 | { |
0b224527 RW |
357 | struct acpi_power_resource_entry *entry; |
358 | int result = 0; | |
d2ef555b | 359 | |
0b224527 RW |
360 | list_for_each_entry_reverse(entry, list, node) { |
361 | result = acpi_power_off(entry->resource); | |
362 | if (result) | |
363 | goto err; | |
364 | } | |
365 | return 0; | |
d2ef555b | 366 | |
0b224527 RW |
367 | err: |
368 | list_for_each_entry_continue(entry, list, node) | |
369 | acpi_power_on(entry->resource); | |
370 | ||
371 | return result; | |
d2ef555b RW |
372 | } |
373 | ||
0b224527 | 374 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 375 | { |
0b224527 | 376 | struct acpi_power_resource_entry *entry; |
d2ef555b | 377 | int result = 0; |
d2ef555b | 378 | |
0b224527 RW |
379 | list_for_each_entry(entry, list, node) { |
380 | result = acpi_power_on(entry->resource); | |
381 | if (result) | |
382 | goto err; | |
d2ef555b | 383 | } |
0b224527 RW |
384 | return 0; |
385 | ||
386 | err: | |
387 | list_for_each_entry_continue_reverse(entry, list, node) | |
388 | acpi_power_off(entry->resource); | |
d2ef555b RW |
389 | |
390 | return result; | |
391 | } | |
392 | ||
0b224527 | 393 | static void acpi_power_add_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 394 | struct acpi_device *adev) |
0090def6 | 395 | { |
bc9b6407 | 396 | struct acpi_power_dependent_device *dep; |
0090def6 | 397 | |
bc9b6407 | 398 | mutex_lock(&resource->resource_lock); |
0090def6 | 399 | |
bc9b6407 RW |
400 | list_for_each_entry(dep, &resource->dependent, node) |
401 | if (dep->adev == adev) | |
402 | goto out; | |
0090def6 | 403 | |
bc9b6407 RW |
404 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
405 | if (!dep) | |
406 | goto out; | |
0090def6 | 407 | |
bc9b6407 RW |
408 | dep->adev = adev; |
409 | INIT_WORK(&dep->work, acpi_power_resume_dependent); | |
410 | list_add_tail(&dep->node, &resource->dependent); | |
0090def6 | 411 | |
bc9b6407 RW |
412 | out: |
413 | mutex_unlock(&resource->resource_lock); | |
0090def6 LM |
414 | } |
415 | ||
0b224527 | 416 | static void acpi_power_remove_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 417 | struct acpi_device *adev) |
0090def6 | 418 | { |
bc9b6407 | 419 | struct acpi_power_dependent_device *dep; |
bc9b6407 | 420 | struct work_struct *work = NULL; |
0090def6 | 421 | |
bc9b6407 | 422 | mutex_lock(&resource->resource_lock); |
0090def6 | 423 | |
bc9b6407 RW |
424 | list_for_each_entry(dep, &resource->dependent, node) |
425 | if (dep->adev == adev) { | |
426 | list_del(&dep->node); | |
427 | work = &dep->work; | |
428 | break; | |
429 | } | |
0090def6 | 430 | |
bc9b6407 | 431 | mutex_unlock(&resource->resource_lock); |
0090def6 | 432 | |
bc9b6407 RW |
433 | if (work) { |
434 | cancel_work_sync(work); | |
435 | kfree(dep); | |
436 | } | |
0090def6 LM |
437 | } |
438 | ||
18a38709 RW |
439 | static struct attribute *attrs[] = { |
440 | NULL, | |
441 | }; | |
442 | ||
443 | static struct attribute_group attr_groups[] = { | |
444 | [ACPI_STATE_D0] = { | |
445 | .name = "power_resources_D0", | |
446 | .attrs = attrs, | |
447 | }, | |
448 | [ACPI_STATE_D1] = { | |
449 | .name = "power_resources_D1", | |
450 | .attrs = attrs, | |
451 | }, | |
452 | [ACPI_STATE_D2] = { | |
453 | .name = "power_resources_D2", | |
454 | .attrs = attrs, | |
455 | }, | |
456 | [ACPI_STATE_D3_HOT] = { | |
457 | .name = "power_resources_D3hot", | |
458 | .attrs = attrs, | |
459 | }, | |
460 | }; | |
461 | ||
41a2a466 RW |
462 | static struct attribute_group wakeup_attr_group = { |
463 | .name = "power_resources_wakeup", | |
464 | .attrs = attrs, | |
465 | }; | |
466 | ||
467 | static void acpi_power_hide_list(struct acpi_device *adev, | |
468 | struct list_head *resources, | |
469 | struct attribute_group *attr_group) | |
18a38709 | 470 | { |
18a38709 RW |
471 | struct acpi_power_resource_entry *entry; |
472 | ||
41a2a466 | 473 | if (list_empty(resources)) |
18a38709 RW |
474 | return; |
475 | ||
41a2a466 | 476 | list_for_each_entry_reverse(entry, resources, node) { |
18a38709 RW |
477 | struct acpi_device *res_dev = &entry->resource->device; |
478 | ||
479 | sysfs_remove_link_from_group(&adev->dev.kobj, | |
41a2a466 | 480 | attr_group->name, |
18a38709 RW |
481 | dev_name(&res_dev->dev)); |
482 | } | |
41a2a466 | 483 | sysfs_remove_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
484 | } |
485 | ||
41a2a466 RW |
486 | static void acpi_power_expose_list(struct acpi_device *adev, |
487 | struct list_head *resources, | |
488 | struct attribute_group *attr_group) | |
0090def6 | 489 | { |
18a38709 RW |
490 | struct acpi_power_resource_entry *entry; |
491 | int ret; | |
492 | ||
41a2a466 | 493 | if (list_empty(resources)) |
18a38709 RW |
494 | return; |
495 | ||
41a2a466 | 496 | ret = sysfs_create_group(&adev->dev.kobj, attr_group); |
18a38709 RW |
497 | if (ret) |
498 | return; | |
499 | ||
41a2a466 | 500 | list_for_each_entry(entry, resources, node) { |
18a38709 RW |
501 | struct acpi_device *res_dev = &entry->resource->device; |
502 | ||
503 | ret = sysfs_add_link_to_group(&adev->dev.kobj, | |
41a2a466 | 504 | attr_group->name, |
18a38709 RW |
505 | &res_dev->dev.kobj, |
506 | dev_name(&res_dev->dev)); | |
507 | if (ret) { | |
41a2a466 | 508 | acpi_power_hide_list(adev, resources, attr_group); |
18a38709 | 509 | break; |
0090def6 LM |
510 | } |
511 | } | |
0090def6 | 512 | } |
bc9b6407 | 513 | |
41a2a466 RW |
514 | static void acpi_power_expose_hide(struct acpi_device *adev, |
515 | struct list_head *resources, | |
516 | struct attribute_group *attr_group, | |
517 | bool expose) | |
518 | { | |
519 | if (expose) | |
520 | acpi_power_expose_list(adev, resources, attr_group); | |
521 | else | |
522 | acpi_power_hide_list(adev, resources, attr_group); | |
523 | } | |
524 | ||
18a38709 RW |
525 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
526 | { | |
527 | struct acpi_device_power_state *ps; | |
528 | struct acpi_power_resource_entry *entry; | |
529 | int state; | |
530 | ||
41a2a466 RW |
531 | if (adev->wakeup.flags.valid) |
532 | acpi_power_expose_hide(adev, &adev->wakeup.resources, | |
533 | &wakeup_attr_group, add); | |
534 | ||
18a38709 RW |
535 | if (!adev->power.flags.power_resources) |
536 | return; | |
537 | ||
538 | ps = &adev->power.states[ACPI_STATE_D0]; | |
539 | list_for_each_entry(entry, &ps->resources, node) { | |
540 | struct acpi_power_resource *resource = entry->resource; | |
541 | ||
542 | if (add) | |
543 | acpi_power_add_dependent(resource, adev); | |
544 | else | |
545 | acpi_power_remove_dependent(resource, adev); | |
546 | } | |
547 | ||
41a2a466 RW |
548 | for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) |
549 | acpi_power_expose_hide(adev, | |
550 | &adev->power.states[state].resources, | |
551 | &attr_groups[state], add); | |
18a38709 RW |
552 | } |
553 | ||
b5d667eb | 554 | int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p) |
0596a52b RW |
555 | { |
556 | struct acpi_power_resource_entry *entry; | |
557 | int system_level = 5; | |
558 | ||
559 | list_for_each_entry(entry, list, node) { | |
560 | struct acpi_power_resource *resource = entry->resource; | |
b5d667eb RW |
561 | acpi_handle handle = resource->device.handle; |
562 | int result; | |
563 | int state; | |
0596a52b | 564 | |
b5d667eb RW |
565 | mutex_lock(&resource->resource_lock); |
566 | ||
567 | result = acpi_power_get_state(handle, &state); | |
568 | if (result) { | |
569 | mutex_unlock(&resource->resource_lock); | |
570 | return result; | |
571 | } | |
572 | if (state == ACPI_POWER_RESOURCE_STATE_ON) { | |
573 | resource->ref_count++; | |
574 | resource->wakeup_enabled = true; | |
575 | } | |
0596a52b RW |
576 | if (system_level > resource->system_level) |
577 | system_level = resource->system_level; | |
b5d667eb RW |
578 | |
579 | mutex_unlock(&resource->resource_lock); | |
0596a52b | 580 | } |
b5d667eb RW |
581 | *system_level_p = system_level; |
582 | return 0; | |
0596a52b RW |
583 | } |
584 | ||
bc9b6407 RW |
585 | /* -------------------------------------------------------------------------- |
586 | Device Power Management | |
587 | -------------------------------------------------------------------------- */ | |
0090def6 | 588 | |
77e76609 RW |
589 | /** |
590 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
591 | * ACPI 3.0) _PSW (Power State Wake) | |
592 | * @dev: Device to handle. | |
593 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
594 | * @sleep_state: Target sleep state of the system. | |
595 | * @dev_state: Target power state of the device. | |
596 | * | |
597 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
598 | * State Wake) for the device, if present. On failure reset the device's | |
599 | * wakeup.flags.valid flag. | |
600 | * | |
601 | * RETURN VALUE: | |
602 | * 0 if either _DSW or _PSW has been successfully executed | |
603 | * 0 if neither _DSW nor _PSW has been found | |
604 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
605 | */ | |
606 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
607 | int enable, int sleep_state, int dev_state) | |
608 | { | |
609 | union acpi_object in_arg[3]; | |
610 | struct acpi_object_list arg_list = { 3, in_arg }; | |
611 | acpi_status status = AE_OK; | |
612 | ||
613 | /* | |
614 | * Try to execute _DSW first. | |
615 | * | |
616 | * Three agruments are needed for the _DSW object: | |
617 | * Argument 0: enable/disable the wake capabilities | |
618 | * Argument 1: target system state | |
619 | * Argument 2: target device state | |
620 | * When _DSW object is called to disable the wake capabilities, maybe | |
621 | * the first argument is filled. The values of the other two agruments | |
622 | * are meaningless. | |
623 | */ | |
624 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
625 | in_arg[0].integer.value = enable; | |
626 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
627 | in_arg[1].integer.value = sleep_state; | |
628 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
629 | in_arg[2].integer.value = dev_state; | |
630 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
631 | if (ACPI_SUCCESS(status)) { | |
632 | return 0; | |
633 | } else if (status != AE_NOT_FOUND) { | |
634 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
635 | dev->wakeup.flags.valid = 0; | |
636 | return -ENODEV; | |
637 | } | |
638 | ||
639 | /* Execute _PSW */ | |
640 | arg_list.count = 1; | |
641 | in_arg[0].integer.value = enable; | |
642 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
643 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
644 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
645 | dev->wakeup.flags.valid = 0; | |
646 | return -ENODEV; | |
647 | } | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
1da177e4 LT |
652 | /* |
653 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
654 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
655 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
656 | * State Wake) for the device, if present | |
1da177e4 | 657 | */ |
77e76609 | 658 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 659 | { |
b5d667eb | 660 | struct acpi_power_resource_entry *entry; |
993cbe59 | 661 | int err = 0; |
1da177e4 | 662 | |
1da177e4 | 663 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 664 | return -EINVAL; |
1da177e4 | 665 | |
9b83ccd2 RW |
666 | mutex_lock(&acpi_device_lock); |
667 | ||
668 | if (dev->wakeup.prepare_count++) | |
669 | goto out; | |
0af4b8c4 | 670 | |
b5d667eb RW |
671 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
672 | struct acpi_power_resource *resource = entry->resource; | |
673 | ||
674 | mutex_lock(&resource->resource_lock); | |
675 | ||
676 | if (!resource->wakeup_enabled) { | |
677 | err = acpi_power_on_unlocked(resource); | |
678 | if (!err) | |
679 | resource->wakeup_enabled = true; | |
680 | } | |
681 | ||
682 | mutex_unlock(&resource->resource_lock); | |
683 | ||
684 | if (err) { | |
685 | dev_err(&dev->dev, | |
686 | "Cannot turn wakeup power resources on\n"); | |
687 | dev->wakeup.flags.valid = 0; | |
688 | goto out; | |
689 | } | |
1da177e4 | 690 | } |
b5d667eb RW |
691 | /* |
692 | * Passing 3 as the third argument below means the device may be | |
693 | * put into arbitrary power state afterward. | |
694 | */ | |
695 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
9b83ccd2 RW |
696 | if (err) |
697 | dev->wakeup.prepare_count = 0; | |
698 | ||
699 | out: | |
700 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 701 | return err; |
1da177e4 LT |
702 | } |
703 | ||
704 | /* | |
705 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
706 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
707 | * State Wake) for the device, if present | |
1da177e4 LT |
708 | * 2. Shutdown down the power resources |
709 | */ | |
4be44fcd | 710 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 711 | { |
b5d667eb | 712 | struct acpi_power_resource_entry *entry; |
993cbe59 | 713 | int err = 0; |
1da177e4 LT |
714 | |
715 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 716 | return -EINVAL; |
1da177e4 | 717 | |
9b83ccd2 RW |
718 | mutex_lock(&acpi_device_lock); |
719 | ||
720 | if (--dev->wakeup.prepare_count > 0) | |
721 | goto out; | |
722 | ||
0af4b8c4 | 723 | /* |
9b83ccd2 RW |
724 | * Executing the code below even if prepare_count is already zero when |
725 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 726 | */ |
9b83ccd2 RW |
727 | if (dev->wakeup.prepare_count < 0) |
728 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 729 | |
9b83ccd2 RW |
730 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
731 | if (err) | |
732 | goto out; | |
1da177e4 | 733 | |
b5d667eb RW |
734 | list_for_each_entry(entry, &dev->wakeup.resources, node) { |
735 | struct acpi_power_resource *resource = entry->resource; | |
736 | ||
737 | mutex_lock(&resource->resource_lock); | |
738 | ||
739 | if (resource->wakeup_enabled) { | |
740 | err = acpi_power_off_unlocked(resource); | |
741 | if (!err) | |
742 | resource->wakeup_enabled = false; | |
743 | } | |
744 | ||
745 | mutex_unlock(&resource->resource_lock); | |
746 | ||
747 | if (err) { | |
748 | dev_err(&dev->dev, | |
749 | "Cannot turn wakeup power resources off\n"); | |
750 | dev->wakeup.flags.valid = 0; | |
751 | break; | |
752 | } | |
1da177e4 LT |
753 | } |
754 | ||
9b83ccd2 RW |
755 | out: |
756 | mutex_unlock(&acpi_device_lock); | |
757 | return err; | |
1da177e4 LT |
758 | } |
759 | ||
32a00d27 | 760 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 761 | { |
4be44fcd | 762 | int result = 0; |
4be44fcd LB |
763 | int list_state = 0; |
764 | int i = 0; | |
1da177e4 | 765 | |
32a00d27 | 766 | if (!device || !state) |
d550d98d | 767 | return -EINVAL; |
1da177e4 | 768 | |
1da177e4 LT |
769 | /* |
770 | * We know a device's inferred power state when all the resources | |
771 | * required for a given D-state are 'on'. | |
772 | */ | |
38c92fff | 773 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
774 | struct list_head *list = &device->power.states[i].resources; |
775 | ||
776 | if (list_empty(list)) | |
1da177e4 LT |
777 | continue; |
778 | ||
779 | result = acpi_power_get_list_state(list, &list_state); | |
780 | if (result) | |
d550d98d | 781 | return result; |
1da177e4 LT |
782 | |
783 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 784 | *state = i; |
d550d98d | 785 | return 0; |
1da177e4 LT |
786 | } |
787 | } | |
788 | ||
32a00d27 | 789 | *state = ACPI_STATE_D3; |
d550d98d | 790 | return 0; |
1da177e4 LT |
791 | } |
792 | ||
30d3df41 RW |
793 | int acpi_power_on_resources(struct acpi_device *device, int state) |
794 | { | |
87e753b0 | 795 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
796 | return -EINVAL; |
797 | ||
798 | return acpi_power_on_list(&device->power.states[state].resources); | |
799 | } | |
800 | ||
4be44fcd | 801 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 802 | { |
5c7dd710 | 803 | int result = 0; |
1da177e4 | 804 | |
3ebc81b8 | 805 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 806 | return -EINVAL; |
1da177e4 | 807 | |
0b224527 | 808 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
809 | return 0; |
810 | ||
4be44fcd | 811 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 812 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 813 | return -ENODEV; |
1da177e4 | 814 | |
1da177e4 LT |
815 | /* TBD: Resources must be ordered. */ |
816 | ||
817 | /* | |
818 | * First we reference all power resources required in the target list | |
d2ef555b RW |
819 | * (e.g. so the device doesn't lose power while transitioning). Then, |
820 | * we dereference all power resources used in the current list. | |
1da177e4 | 821 | */ |
5c7dd710 RW |
822 | if (state < ACPI_STATE_D3_COLD) |
823 | result = acpi_power_on_list( | |
824 | &device->power.states[state].resources); | |
825 | ||
826 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
827 | acpi_power_off_list( |
828 | &device->power.states[device->power.state].resources); | |
1da177e4 | 829 | |
d2ef555b RW |
830 | /* We shouldn't change the state unless the above operations succeed. */ |
831 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 832 | |
d550d98d | 833 | return result; |
1da177e4 LT |
834 | } |
835 | ||
82c7d5ef RW |
836 | static void acpi_release_power_resource(struct device *dev) |
837 | { | |
838 | struct acpi_device *device = to_acpi_device(dev); | |
839 | struct acpi_power_resource *resource; | |
840 | ||
82c7d5ef | 841 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
842 | |
843 | mutex_lock(&power_resource_list_lock); | |
844 | list_del(&resource->list_node); | |
845 | mutex_unlock(&power_resource_list_lock); | |
846 | ||
c0af4175 | 847 | acpi_free_pnp_ids(&device->pnp); |
82c7d5ef RW |
848 | kfree(resource); |
849 | } | |
1da177e4 | 850 | |
b1c0f99b RW |
851 | static ssize_t acpi_power_in_use_show(struct device *dev, |
852 | struct device_attribute *attr, | |
853 | char *buf) { | |
854 | struct acpi_power_resource *resource; | |
855 | ||
856 | resource = to_power_resource(to_acpi_device(dev)); | |
857 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
858 | } | |
859 | static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL); | |
860 | ||
861 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
862 | { | |
863 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
864 | } | |
865 | ||
e88c9c60 | 866 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 867 | { |
82c7d5ef RW |
868 | struct acpi_power_resource *resource; |
869 | struct acpi_device *device = NULL; | |
4be44fcd LB |
870 | union acpi_object acpi_object; |
871 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
872 | acpi_status status; |
873 | int state, result = -ENODEV; | |
1da177e4 | 874 | |
82c7d5ef RW |
875 | acpi_bus_get_device(handle, &device); |
876 | if (device) | |
e88c9c60 | 877 | return 0; |
1da177e4 | 878 | |
82c7d5ef | 879 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 880 | if (!resource) |
e88c9c60 | 881 | return -ENOMEM; |
1da177e4 | 882 | |
82c7d5ef RW |
883 | device = &resource->device; |
884 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
885 | ACPI_STA_DEFAULT); | |
0a613902 | 886 | mutex_init(&resource->resource_lock); |
bc9b6407 | 887 | INIT_LIST_HEAD(&resource->dependent); |
6ee22e9d | 888 | INIT_LIST_HEAD(&resource->list_node); |
82c7d5ef | 889 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
890 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
891 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 892 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
893 | |
894 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
895 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
896 | if (ACPI_FAILURE(status)) | |
781d737c | 897 | goto err; |
82c7d5ef | 898 | |
1da177e4 LT |
899 | resource->system_level = acpi_object.power_resource.system_level; |
900 | resource->order = acpi_object.power_resource.resource_order; | |
901 | ||
82c7d5ef | 902 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 903 | if (result) |
781d737c | 904 | goto err; |
1da177e4 | 905 | |
1da177e4 | 906 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 907 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 908 | |
82c7d5ef | 909 | device->flags.match_driver = true; |
cf860be6 | 910 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 911 | if (result) |
781d737c | 912 | goto err; |
4be44fcd | 913 | |
b1c0f99b RW |
914 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
915 | device->remove = acpi_power_sysfs_remove; | |
916 | ||
781d737c RW |
917 | mutex_lock(&power_resource_list_lock); |
918 | list_add(&resource->list_node, &acpi_power_resource_list); | |
919 | mutex_unlock(&power_resource_list_lock); | |
cf860be6 | 920 | acpi_device_add_finalize(device); |
e88c9c60 | 921 | return 0; |
1da177e4 | 922 | |
781d737c RW |
923 | err: |
924 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 925 | return result; |
781d737c | 926 | } |
1da177e4 | 927 | |
781d737c RW |
928 | #ifdef CONFIG_ACPI_SLEEP |
929 | void acpi_resume_power_resources(void) | |
0a613902 | 930 | { |
3e384ee6 | 931 | struct acpi_power_resource *resource; |
0a613902 | 932 | |
781d737c | 933 | mutex_lock(&power_resource_list_lock); |
0a613902 | 934 | |
781d737c RW |
935 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
936 | int result, state; | |
0a613902 | 937 | |
781d737c | 938 | mutex_lock(&resource->resource_lock); |
0a613902 | 939 | |
781d737c | 940 | result = acpi_power_get_state(resource->device.handle, &state); |
660b1113 RW |
941 | if (result) |
942 | continue; | |
943 | ||
944 | if (state == ACPI_POWER_RESOURCE_STATE_OFF | |
781d737c RW |
945 | && resource->ref_count) { |
946 | dev_info(&resource->device.dev, "Turning ON\n"); | |
947 | __acpi_power_on(resource); | |
660b1113 RW |
948 | } else if (state == ACPI_POWER_RESOURCE_STATE_ON |
949 | && !resource->ref_count) { | |
950 | dev_info(&resource->device.dev, "Turning OFF\n"); | |
951 | __acpi_power_off(resource); | |
781d737c | 952 | } |
0a613902 | 953 | |
781d737c RW |
954 | mutex_unlock(&resource->resource_lock); |
955 | } | |
3e384ee6 | 956 | |
781d737c | 957 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 958 | } |
90692404 | 959 | #endif |