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1da177e4 LT |
1 | /* |
2 | * acpi_power.c - ACPI Bus Power Management ($Revision: 39 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | /* | |
27 | * ACPI power-managed devices may be controlled in two ways: | |
28 | * 1. via "Device Specific (D-State) Control" | |
29 | * 2. via "Power Resource Control". | |
30 | * This module is used to manage devices relying on Power Resource Control. | |
31 | * | |
32 | * An ACPI "power resource object" describes a software controllable power | |
33 | * plane, clock plane, or other resource used by a power managed device. | |
34 | * A device may rely on multiple power resources, and a power resource | |
35 | * may be shared by multiple devices. | |
36 | */ | |
37 | ||
38 | #include <linux/kernel.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/types.h> | |
5a0e3ad6 | 42 | #include <linux/slab.h> |
0090def6 | 43 | #include <linux/pm_runtime.h> |
1da177e4 LT |
44 | #include <acpi/acpi_bus.h> |
45 | #include <acpi/acpi_drivers.h> | |
9b83ccd2 | 46 | #include "sleep.h" |
0090def6 | 47 | #include "internal.h" |
9b83ccd2 | 48 | |
a192a958 LB |
49 | #define PREFIX "ACPI: " |
50 | ||
89595b8f | 51 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 52 | ACPI_MODULE_NAME("power"); |
1da177e4 | 53 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 LT |
54 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
55 | #define ACPI_POWER_FILE_INFO "info" | |
56 | #define ACPI_POWER_FILE_STATUS "state" | |
57 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
58 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
59 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 60 | |
bc9b6407 RW |
61 | struct acpi_power_dependent_device { |
62 | struct list_head node; | |
63 | struct acpi_device *adev; | |
64 | struct work_struct work; | |
0090def6 LM |
65 | }; |
66 | ||
4be44fcd | 67 | struct acpi_power_resource { |
82c7d5ef | 68 | struct acpi_device device; |
781d737c | 69 | struct list_head list_node; |
bc9b6407 | 70 | struct list_head dependent; |
82c7d5ef | 71 | char *name; |
4be44fcd LB |
72 | u32 system_level; |
73 | u32 order; | |
3e384ee6 | 74 | unsigned int ref_count; |
0a613902 | 75 | struct mutex resource_lock; |
1da177e4 LT |
76 | }; |
77 | ||
0b224527 RW |
78 | struct acpi_power_resource_entry { |
79 | struct list_head node; | |
80 | struct acpi_power_resource *resource; | |
81 | }; | |
82 | ||
781d737c RW |
83 | static LIST_HEAD(acpi_power_resource_list); |
84 | static DEFINE_MUTEX(power_resource_list_lock); | |
1da177e4 | 85 | |
1da177e4 LT |
86 | /* -------------------------------------------------------------------------- |
87 | Power Resource Management | |
88 | -------------------------------------------------------------------------- */ | |
89 | ||
b1c0f99b RW |
90 | static inline |
91 | struct acpi_power_resource *to_power_resource(struct acpi_device *device) | |
92 | { | |
93 | return container_of(device, struct acpi_power_resource, device); | |
94 | } | |
95 | ||
82c7d5ef | 96 | static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle) |
1da177e4 | 97 | { |
82c7d5ef | 98 | struct acpi_device *device; |
1da177e4 | 99 | |
82c7d5ef RW |
100 | if (acpi_bus_get_device(handle, &device)) |
101 | return NULL; | |
1da177e4 | 102 | |
b1c0f99b | 103 | return to_power_resource(device); |
1da177e4 LT |
104 | } |
105 | ||
e88c9c60 RW |
106 | static int acpi_power_resources_list_add(acpi_handle handle, |
107 | struct list_head *list) | |
0b224527 RW |
108 | { |
109 | struct acpi_power_resource *resource = acpi_power_get_context(handle); | |
110 | struct acpi_power_resource_entry *entry; | |
111 | ||
112 | if (!resource || !list) | |
e88c9c60 | 113 | return -EINVAL; |
0b224527 RW |
114 | |
115 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
116 | if (!entry) | |
e88c9c60 | 117 | return -ENOMEM; |
0b224527 RW |
118 | |
119 | entry->resource = resource; | |
120 | if (!list_empty(list)) { | |
121 | struct acpi_power_resource_entry *e; | |
122 | ||
123 | list_for_each_entry(e, list, node) | |
124 | if (e->resource->order > resource->order) { | |
125 | list_add_tail(&entry->node, &e->node); | |
e88c9c60 | 126 | return 0; |
0b224527 RW |
127 | } |
128 | } | |
129 | list_add_tail(&entry->node, list); | |
e88c9c60 | 130 | return 0; |
0b224527 RW |
131 | } |
132 | ||
133 | void acpi_power_resources_list_free(struct list_head *list) | |
134 | { | |
135 | struct acpi_power_resource_entry *entry, *e; | |
136 | ||
137 | list_for_each_entry_safe(entry, e, list, node) { | |
138 | list_del(&entry->node); | |
139 | kfree(entry); | |
140 | } | |
141 | } | |
142 | ||
e88c9c60 RW |
143 | int acpi_extract_power_resources(union acpi_object *package, unsigned int start, |
144 | struct list_head *list) | |
ef85bdbe | 145 | { |
ef85bdbe | 146 | unsigned int i; |
e88c9c60 | 147 | int err = 0; |
ef85bdbe RW |
148 | |
149 | for (i = start; i < package->package.count; i++) { | |
150 | union acpi_object *element = &package->package.elements[i]; | |
151 | acpi_handle rhandle; | |
152 | ||
153 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { | |
e88c9c60 | 154 | err = -ENODATA; |
ef85bdbe RW |
155 | break; |
156 | } | |
157 | rhandle = element->reference.handle; | |
158 | if (!rhandle) { | |
e88c9c60 | 159 | err = -ENODEV; |
ef85bdbe RW |
160 | break; |
161 | } | |
e88c9c60 RW |
162 | err = acpi_add_power_resource(rhandle); |
163 | if (err) | |
164 | break; | |
165 | ||
166 | err = acpi_power_resources_list_add(rhandle, list); | |
167 | if (err) | |
168 | break; | |
ef85bdbe | 169 | } |
e88c9c60 | 170 | if (err) |
ef85bdbe RW |
171 | acpi_power_resources_list_free(list); |
172 | ||
e88c9c60 | 173 | return err; |
ef85bdbe RW |
174 | } |
175 | ||
a51e145f | 176 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 177 | { |
4be44fcd | 178 | acpi_status status = AE_OK; |
27663c58 | 179 | unsigned long long sta = 0; |
60a4ce7f LM |
180 | char node_name[5]; |
181 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 182 | |
1da177e4 | 183 | |
a51e145f | 184 | if (!handle || !state) |
d550d98d | 185 | return -EINVAL; |
1da177e4 | 186 | |
a51e145f | 187 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 188 | if (ACPI_FAILURE(status)) |
d550d98d | 189 | return -ENODEV; |
1da177e4 | 190 | |
c35923bc AS |
191 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
192 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 193 | |
60a4ce7f LM |
194 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
195 | ||
1da177e4 | 196 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 197 | node_name, |
b1b57fbe | 198 | *state ? "on" : "off")); |
1da177e4 | 199 | |
d550d98d | 200 | return 0; |
1da177e4 LT |
201 | } |
202 | ||
0b224527 | 203 | static int acpi_power_get_list_state(struct list_head *list, int *state) |
1da177e4 | 204 | { |
0b224527 | 205 | struct acpi_power_resource_entry *entry; |
d0515d9f | 206 | int cur_state; |
1da177e4 LT |
207 | |
208 | if (!list || !state) | |
d550d98d | 209 | return -EINVAL; |
1da177e4 LT |
210 | |
211 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
0b224527 RW |
212 | list_for_each_entry(entry, list, node) { |
213 | struct acpi_power_resource *resource = entry->resource; | |
214 | acpi_handle handle = resource->device.handle; | |
d0515d9f RW |
215 | int result; |
216 | ||
d0515d9f | 217 | mutex_lock(&resource->resource_lock); |
d0515d9f | 218 | result = acpi_power_get_state(handle, &cur_state); |
d0515d9f | 219 | mutex_unlock(&resource->resource_lock); |
d0515d9f RW |
220 | if (result) |
221 | return result; | |
222 | ||
223 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
224 | break; |
225 | } | |
226 | ||
227 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 228 | cur_state ? "on" : "off")); |
1da177e4 | 229 | |
d0515d9f | 230 | *state = cur_state; |
d0515d9f | 231 | return 0; |
1da177e4 LT |
232 | } |
233 | ||
bc9b6407 | 234 | static void acpi_power_resume_dependent(struct work_struct *work) |
0090def6 | 235 | { |
bc9b6407 RW |
236 | struct acpi_power_dependent_device *dep; |
237 | struct acpi_device_physical_node *pn; | |
238 | struct acpi_device *adev; | |
0090def6 LM |
239 | int state; |
240 | ||
bc9b6407 RW |
241 | dep = container_of(work, struct acpi_power_dependent_device, work); |
242 | adev = dep->adev; | |
243 | if (acpi_power_get_inferred_state(adev, &state)) | |
0090def6 LM |
244 | return; |
245 | ||
bc9b6407 | 246 | if (state > ACPI_STATE_D0) |
0090def6 LM |
247 | return; |
248 | ||
bc9b6407 RW |
249 | mutex_lock(&adev->physical_node_lock); |
250 | ||
251 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
252 | pm_request_resume(pn->dev); | |
253 | ||
254 | list_for_each_entry(pn, &adev->power_dependent, node) | |
255 | pm_request_resume(pn->dev); | |
256 | ||
257 | mutex_unlock(&adev->physical_node_lock); | |
0090def6 LM |
258 | } |
259 | ||
3e384ee6 | 260 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 261 | { |
4be44fcd | 262 | acpi_status status = AE_OK; |
1da177e4 | 263 | |
82c7d5ef | 264 | status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL); |
3e384ee6 RW |
265 | if (ACPI_FAILURE(status)) |
266 | return -ENODEV; | |
267 | ||
3e384ee6 RW |
268 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", |
269 | resource->name)); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
0b224527 | 274 | static int acpi_power_on(struct acpi_power_resource *resource) |
3e384ee6 | 275 | { |
0b224527 | 276 | int result = 0;; |
1da177e4 | 277 | |
0a613902 | 278 | mutex_lock(&resource->resource_lock); |
0a613902 | 279 | |
3e384ee6 RW |
280 | if (resource->ref_count++) { |
281 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
282 | "Power resource [%s] already on", | |
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 LM |
294 | } |
295 | ||
bc9b6407 | 296 | mutex_unlock(&resource->resource_lock); |
40bf66ec | 297 | |
12b3b5af | 298 | return result; |
1da177e4 LT |
299 | } |
300 | ||
0b224527 | 301 | static int acpi_power_off(struct acpi_power_resource *resource) |
1da177e4 | 302 | { |
4be44fcd | 303 | acpi_status status = AE_OK; |
0b224527 | 304 | int result = 0; |
1da177e4 | 305 | |
0a613902 | 306 | mutex_lock(&resource->resource_lock); |
3e384ee6 RW |
307 | |
308 | if (!resource->ref_count) { | |
309 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
310 | "Power resource [%s] already off", | |
311 | resource->name)); | |
312 | goto unlock; | |
0a613902 | 313 | } |
1da177e4 | 314 | |
3e384ee6 RW |
315 | if (--resource->ref_count) { |
316 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
317 | "Power resource [%s] still in use\n", | |
318 | resource->name)); | |
319 | goto unlock; | |
1da177e4 LT |
320 | } |
321 | ||
82c7d5ef | 322 | status = acpi_evaluate_object(resource->device.handle, "_OFF", NULL, NULL); |
722c929f | 323 | if (ACPI_FAILURE(status)) |
3e384ee6 | 324 | result = -ENODEV; |
722c929f | 325 | else |
3e384ee6 RW |
326 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
327 | "Power resource [%s] turned off\n", | |
328 | resource->name)); | |
1da177e4 | 329 | |
3e384ee6 RW |
330 | unlock: |
331 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 332 | |
3e384ee6 | 333 | return result; |
1da177e4 LT |
334 | } |
335 | ||
0b224527 | 336 | static int acpi_power_off_list(struct list_head *list) |
d2ef555b | 337 | { |
0b224527 RW |
338 | struct acpi_power_resource_entry *entry; |
339 | int result = 0; | |
d2ef555b | 340 | |
0b224527 RW |
341 | list_for_each_entry_reverse(entry, list, node) { |
342 | result = acpi_power_off(entry->resource); | |
343 | if (result) | |
344 | goto err; | |
345 | } | |
346 | return 0; | |
d2ef555b | 347 | |
0b224527 RW |
348 | err: |
349 | list_for_each_entry_continue(entry, list, node) | |
350 | acpi_power_on(entry->resource); | |
351 | ||
352 | return result; | |
d2ef555b RW |
353 | } |
354 | ||
0b224527 | 355 | static int acpi_power_on_list(struct list_head *list) |
d2ef555b | 356 | { |
0b224527 | 357 | struct acpi_power_resource_entry *entry; |
d2ef555b | 358 | int result = 0; |
d2ef555b | 359 | |
0b224527 RW |
360 | list_for_each_entry(entry, list, node) { |
361 | result = acpi_power_on(entry->resource); | |
362 | if (result) | |
363 | goto err; | |
d2ef555b | 364 | } |
0b224527 RW |
365 | return 0; |
366 | ||
367 | err: | |
368 | list_for_each_entry_continue_reverse(entry, list, node) | |
369 | acpi_power_off(entry->resource); | |
d2ef555b RW |
370 | |
371 | return result; | |
372 | } | |
373 | ||
0b224527 | 374 | static void acpi_power_add_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 375 | struct acpi_device *adev) |
0090def6 | 376 | { |
bc9b6407 | 377 | struct acpi_power_dependent_device *dep; |
0090def6 | 378 | |
bc9b6407 | 379 | mutex_lock(&resource->resource_lock); |
0090def6 | 380 | |
bc9b6407 RW |
381 | list_for_each_entry(dep, &resource->dependent, node) |
382 | if (dep->adev == adev) | |
383 | goto out; | |
0090def6 | 384 | |
bc9b6407 RW |
385 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
386 | if (!dep) | |
387 | goto out; | |
0090def6 | 388 | |
bc9b6407 RW |
389 | dep->adev = adev; |
390 | INIT_WORK(&dep->work, acpi_power_resume_dependent); | |
391 | list_add_tail(&dep->node, &resource->dependent); | |
0090def6 | 392 | |
bc9b6407 RW |
393 | out: |
394 | mutex_unlock(&resource->resource_lock); | |
0090def6 LM |
395 | } |
396 | ||
0b224527 | 397 | static void acpi_power_remove_dependent(struct acpi_power_resource *resource, |
bc9b6407 | 398 | struct acpi_device *adev) |
0090def6 | 399 | { |
bc9b6407 | 400 | struct acpi_power_dependent_device *dep; |
bc9b6407 | 401 | struct work_struct *work = NULL; |
0090def6 | 402 | |
bc9b6407 | 403 | mutex_lock(&resource->resource_lock); |
0090def6 | 404 | |
bc9b6407 RW |
405 | list_for_each_entry(dep, &resource->dependent, node) |
406 | if (dep->adev == adev) { | |
407 | list_del(&dep->node); | |
408 | work = &dep->work; | |
409 | break; | |
410 | } | |
0090def6 | 411 | |
bc9b6407 | 412 | mutex_unlock(&resource->resource_lock); |
0090def6 | 413 | |
bc9b6407 RW |
414 | if (work) { |
415 | cancel_work_sync(work); | |
416 | kfree(dep); | |
417 | } | |
0090def6 LM |
418 | } |
419 | ||
bc9b6407 | 420 | void acpi_power_add_remove_device(struct acpi_device *adev, bool add) |
0090def6 | 421 | { |
bc9b6407 RW |
422 | if (adev->power.flags.power_resources) { |
423 | struct acpi_device_power_state *ps; | |
0b224527 | 424 | struct acpi_power_resource_entry *entry; |
0090def6 | 425 | |
bc9b6407 | 426 | ps = &adev->power.states[ACPI_STATE_D0]; |
0b224527 RW |
427 | list_for_each_entry(entry, &ps->resources, node) { |
428 | struct acpi_power_resource *resource = entry->resource; | |
0090def6 | 429 | |
bc9b6407 | 430 | if (add) |
0b224527 | 431 | acpi_power_add_dependent(resource, adev); |
bc9b6407 | 432 | else |
0b224527 | 433 | acpi_power_remove_dependent(resource, adev); |
0090def6 LM |
434 | } |
435 | } | |
0090def6 | 436 | } |
bc9b6407 | 437 | |
0596a52b RW |
438 | int acpi_power_min_system_level(struct list_head *list) |
439 | { | |
440 | struct acpi_power_resource_entry *entry; | |
441 | int system_level = 5; | |
442 | ||
443 | list_for_each_entry(entry, list, node) { | |
444 | struct acpi_power_resource *resource = entry->resource; | |
445 | ||
446 | if (system_level > resource->system_level) | |
447 | system_level = resource->system_level; | |
448 | } | |
449 | return system_level; | |
450 | } | |
451 | ||
bc9b6407 RW |
452 | /* -------------------------------------------------------------------------- |
453 | Device Power Management | |
454 | -------------------------------------------------------------------------- */ | |
0090def6 | 455 | |
77e76609 RW |
456 | /** |
457 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
458 | * ACPI 3.0) _PSW (Power State Wake) | |
459 | * @dev: Device to handle. | |
460 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
461 | * @sleep_state: Target sleep state of the system. | |
462 | * @dev_state: Target power state of the device. | |
463 | * | |
464 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
465 | * State Wake) for the device, if present. On failure reset the device's | |
466 | * wakeup.flags.valid flag. | |
467 | * | |
468 | * RETURN VALUE: | |
469 | * 0 if either _DSW or _PSW has been successfully executed | |
470 | * 0 if neither _DSW nor _PSW has been found | |
471 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
472 | */ | |
473 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
474 | int enable, int sleep_state, int dev_state) | |
475 | { | |
476 | union acpi_object in_arg[3]; | |
477 | struct acpi_object_list arg_list = { 3, in_arg }; | |
478 | acpi_status status = AE_OK; | |
479 | ||
480 | /* | |
481 | * Try to execute _DSW first. | |
482 | * | |
483 | * Three agruments are needed for the _DSW object: | |
484 | * Argument 0: enable/disable the wake capabilities | |
485 | * Argument 1: target system state | |
486 | * Argument 2: target device state | |
487 | * When _DSW object is called to disable the wake capabilities, maybe | |
488 | * the first argument is filled. The values of the other two agruments | |
489 | * are meaningless. | |
490 | */ | |
491 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
492 | in_arg[0].integer.value = enable; | |
493 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
494 | in_arg[1].integer.value = sleep_state; | |
495 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
496 | in_arg[2].integer.value = dev_state; | |
497 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
498 | if (ACPI_SUCCESS(status)) { | |
499 | return 0; | |
500 | } else if (status != AE_NOT_FOUND) { | |
501 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
502 | dev->wakeup.flags.valid = 0; | |
503 | return -ENODEV; | |
504 | } | |
505 | ||
506 | /* Execute _PSW */ | |
507 | arg_list.count = 1; | |
508 | in_arg[0].integer.value = enable; | |
509 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
510 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
511 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
512 | dev->wakeup.flags.valid = 0; | |
513 | return -ENODEV; | |
514 | } | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
1da177e4 LT |
519 | /* |
520 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
521 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
522 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
523 | * State Wake) for the device, if present | |
1da177e4 | 524 | */ |
77e76609 | 525 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 526 | { |
993cbe59 | 527 | int err = 0; |
1da177e4 | 528 | |
1da177e4 | 529 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 530 | return -EINVAL; |
1da177e4 | 531 | |
9b83ccd2 RW |
532 | mutex_lock(&acpi_device_lock); |
533 | ||
534 | if (dev->wakeup.prepare_count++) | |
535 | goto out; | |
0af4b8c4 | 536 | |
993cbe59 RW |
537 | err = acpi_power_on_list(&dev->wakeup.resources); |
538 | if (err) { | |
539 | dev_err(&dev->dev, "Cannot turn wakeup power resources on\n"); | |
540 | dev->wakeup.flags.valid = 0; | |
541 | } else { | |
542 | /* | |
543 | * Passing 3 as the third argument below means the device may be | |
544 | * put into arbitrary power state afterward. | |
545 | */ | |
546 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); | |
1da177e4 | 547 | } |
9b83ccd2 RW |
548 | if (err) |
549 | dev->wakeup.prepare_count = 0; | |
550 | ||
551 | out: | |
552 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 553 | return err; |
1da177e4 LT |
554 | } |
555 | ||
556 | /* | |
557 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
558 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
559 | * State Wake) for the device, if present | |
1da177e4 LT |
560 | * 2. Shutdown down the power resources |
561 | */ | |
4be44fcd | 562 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 563 | { |
993cbe59 | 564 | int err = 0; |
1da177e4 LT |
565 | |
566 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 567 | return -EINVAL; |
1da177e4 | 568 | |
9b83ccd2 RW |
569 | mutex_lock(&acpi_device_lock); |
570 | ||
571 | if (--dev->wakeup.prepare_count > 0) | |
572 | goto out; | |
573 | ||
0af4b8c4 | 574 | /* |
9b83ccd2 RW |
575 | * Executing the code below even if prepare_count is already zero when |
576 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 577 | */ |
9b83ccd2 RW |
578 | if (dev->wakeup.prepare_count < 0) |
579 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 580 | |
9b83ccd2 RW |
581 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
582 | if (err) | |
583 | goto out; | |
1da177e4 | 584 | |
993cbe59 RW |
585 | err = acpi_power_off_list(&dev->wakeup.resources); |
586 | if (err) { | |
587 | dev_err(&dev->dev, "Cannot turn wakeup power resources off\n"); | |
588 | dev->wakeup.flags.valid = 0; | |
1da177e4 LT |
589 | } |
590 | ||
9b83ccd2 RW |
591 | out: |
592 | mutex_unlock(&acpi_device_lock); | |
593 | return err; | |
1da177e4 LT |
594 | } |
595 | ||
32a00d27 | 596 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 597 | { |
4be44fcd | 598 | int result = 0; |
4be44fcd LB |
599 | int list_state = 0; |
600 | int i = 0; | |
1da177e4 | 601 | |
32a00d27 | 602 | if (!device || !state) |
d550d98d | 603 | return -EINVAL; |
1da177e4 | 604 | |
1da177e4 LT |
605 | /* |
606 | * We know a device's inferred power state when all the resources | |
607 | * required for a given D-state are 'on'. | |
608 | */ | |
38c92fff | 609 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
0b224527 RW |
610 | struct list_head *list = &device->power.states[i].resources; |
611 | ||
612 | if (list_empty(list)) | |
1da177e4 LT |
613 | continue; |
614 | ||
615 | result = acpi_power_get_list_state(list, &list_state); | |
616 | if (result) | |
d550d98d | 617 | return result; |
1da177e4 LT |
618 | |
619 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 620 | *state = i; |
d550d98d | 621 | return 0; |
1da177e4 LT |
622 | } |
623 | } | |
624 | ||
32a00d27 | 625 | *state = ACPI_STATE_D3; |
d550d98d | 626 | return 0; |
1da177e4 LT |
627 | } |
628 | ||
30d3df41 RW |
629 | int acpi_power_on_resources(struct acpi_device *device, int state) |
630 | { | |
87e753b0 | 631 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT) |
30d3df41 RW |
632 | return -EINVAL; |
633 | ||
634 | return acpi_power_on_list(&device->power.states[state].resources); | |
635 | } | |
636 | ||
4be44fcd | 637 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 638 | { |
5c7dd710 | 639 | int result = 0; |
1da177e4 | 640 | |
3ebc81b8 | 641 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 642 | return -EINVAL; |
1da177e4 | 643 | |
0b224527 | 644 | if (device->power.state == state || !device->flags.power_manageable) |
212967c6 RW |
645 | return 0; |
646 | ||
4be44fcd | 647 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 648 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 649 | return -ENODEV; |
1da177e4 | 650 | |
1da177e4 LT |
651 | /* TBD: Resources must be ordered. */ |
652 | ||
653 | /* | |
654 | * First we reference all power resources required in the target list | |
d2ef555b RW |
655 | * (e.g. so the device doesn't lose power while transitioning). Then, |
656 | * we dereference all power resources used in the current list. | |
1da177e4 | 657 | */ |
5c7dd710 RW |
658 | if (state < ACPI_STATE_D3_COLD) |
659 | result = acpi_power_on_list( | |
660 | &device->power.states[state].resources); | |
661 | ||
662 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
663 | acpi_power_off_list( |
664 | &device->power.states[device->power.state].resources); | |
1da177e4 | 665 | |
d2ef555b RW |
666 | /* We shouldn't change the state unless the above operations succeed. */ |
667 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 668 | |
d550d98d | 669 | return result; |
1da177e4 LT |
670 | } |
671 | ||
82c7d5ef RW |
672 | static void acpi_release_power_resource(struct device *dev) |
673 | { | |
674 | struct acpi_device *device = to_acpi_device(dev); | |
675 | struct acpi_power_resource *resource; | |
676 | ||
82c7d5ef | 677 | resource = container_of(device, struct acpi_power_resource, device); |
781d737c RW |
678 | |
679 | mutex_lock(&power_resource_list_lock); | |
680 | list_del(&resource->list_node); | |
681 | mutex_unlock(&power_resource_list_lock); | |
682 | ||
683 | acpi_free_ids(device); | |
82c7d5ef RW |
684 | kfree(resource); |
685 | } | |
1da177e4 | 686 | |
b1c0f99b RW |
687 | static ssize_t acpi_power_in_use_show(struct device *dev, |
688 | struct device_attribute *attr, | |
689 | char *buf) { | |
690 | struct acpi_power_resource *resource; | |
691 | ||
692 | resource = to_power_resource(to_acpi_device(dev)); | |
693 | return sprintf(buf, "%u\n", !!resource->ref_count); | |
694 | } | |
695 | static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL); | |
696 | ||
697 | static void acpi_power_sysfs_remove(struct acpi_device *device) | |
698 | { | |
699 | device_remove_file(&device->dev, &dev_attr_resource_in_use); | |
700 | } | |
701 | ||
e88c9c60 | 702 | int acpi_add_power_resource(acpi_handle handle) |
1da177e4 | 703 | { |
82c7d5ef RW |
704 | struct acpi_power_resource *resource; |
705 | struct acpi_device *device = NULL; | |
4be44fcd LB |
706 | union acpi_object acpi_object; |
707 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
82c7d5ef RW |
708 | acpi_status status; |
709 | int state, result = -ENODEV; | |
1da177e4 | 710 | |
82c7d5ef RW |
711 | acpi_bus_get_device(handle, &device); |
712 | if (device) | |
e88c9c60 | 713 | return 0; |
1da177e4 | 714 | |
82c7d5ef | 715 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
1da177e4 | 716 | if (!resource) |
e88c9c60 | 717 | return -ENOMEM; |
1da177e4 | 718 | |
82c7d5ef RW |
719 | device = &resource->device; |
720 | acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER, | |
721 | ACPI_STA_DEFAULT); | |
0a613902 | 722 | mutex_init(&resource->resource_lock); |
bc9b6407 | 723 | INIT_LIST_HEAD(&resource->dependent); |
82c7d5ef | 724 | resource->name = device->pnp.bus_id; |
1da177e4 LT |
725 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); |
726 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
722c929f | 727 | device->power.state = ACPI_STATE_UNKNOWN; |
1da177e4 LT |
728 | |
729 | /* Evalute the object to get the system level and resource order. */ | |
82c7d5ef RW |
730 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
731 | if (ACPI_FAILURE(status)) | |
781d737c | 732 | goto err; |
82c7d5ef | 733 | |
1da177e4 LT |
734 | resource->system_level = acpi_object.power_resource.system_level; |
735 | resource->order = acpi_object.power_resource.resource_order; | |
736 | ||
82c7d5ef | 737 | result = acpi_power_get_state(handle, &state); |
1da177e4 | 738 | if (result) |
781d737c | 739 | goto err; |
1da177e4 | 740 | |
1da177e4 | 741 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 742 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 743 | |
82c7d5ef | 744 | device->flags.match_driver = true; |
cf860be6 | 745 | result = acpi_device_add(device, acpi_release_power_resource); |
1da177e4 | 746 | if (result) |
781d737c | 747 | goto err; |
4be44fcd | 748 | |
b1c0f99b RW |
749 | if (!device_create_file(&device->dev, &dev_attr_resource_in_use)) |
750 | device->remove = acpi_power_sysfs_remove; | |
751 | ||
781d737c RW |
752 | mutex_lock(&power_resource_list_lock); |
753 | list_add(&resource->list_node, &acpi_power_resource_list); | |
754 | mutex_unlock(&power_resource_list_lock); | |
cf860be6 | 755 | acpi_device_add_finalize(device); |
e88c9c60 | 756 | return 0; |
1da177e4 | 757 | |
781d737c RW |
758 | err: |
759 | acpi_release_power_resource(&device->dev); | |
e88c9c60 | 760 | return result; |
781d737c | 761 | } |
1da177e4 | 762 | |
781d737c RW |
763 | #ifdef CONFIG_ACPI_SLEEP |
764 | void acpi_resume_power_resources(void) | |
0a613902 | 765 | { |
3e384ee6 | 766 | struct acpi_power_resource *resource; |
0a613902 | 767 | |
781d737c | 768 | mutex_lock(&power_resource_list_lock); |
0a613902 | 769 | |
781d737c RW |
770 | list_for_each_entry(resource, &acpi_power_resource_list, list_node) { |
771 | int result, state; | |
0a613902 | 772 | |
781d737c | 773 | mutex_lock(&resource->resource_lock); |
0a613902 | 774 | |
781d737c RW |
775 | result = acpi_power_get_state(resource->device.handle, &state); |
776 | if (!result && state == ACPI_POWER_RESOURCE_STATE_OFF | |
777 | && resource->ref_count) { | |
778 | dev_info(&resource->device.dev, "Turning ON\n"); | |
779 | __acpi_power_on(resource); | |
780 | } | |
0a613902 | 781 | |
781d737c RW |
782 | mutex_unlock(&resource->resource_lock); |
783 | } | |
3e384ee6 | 784 | |
781d737c | 785 | mutex_unlock(&power_resource_list_lock); |
0a613902 | 786 | } |
90692404 | 787 | #endif |