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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 | |
4be44fcd LB |
61 | static int acpi_power_add(struct acpi_device *device); |
62 | static int acpi_power_remove(struct acpi_device *device, int type); | |
1da177e4 | 63 | |
c97adf9e | 64 | static const struct acpi_device_id power_device_ids[] = { |
1ba90e3a TR |
65 | {ACPI_POWER_HID, 0}, |
66 | {"", 0}, | |
67 | }; | |
68 | MODULE_DEVICE_TABLE(acpi, power_device_ids); | |
69 | ||
90692404 | 70 | #ifdef CONFIG_PM_SLEEP |
e579e2dd | 71 | static int acpi_power_resume(struct device *dev); |
90692404 | 72 | #endif |
e579e2dd RW |
73 | static SIMPLE_DEV_PM_OPS(acpi_power_pm, NULL, acpi_power_resume); |
74 | ||
1da177e4 | 75 | static struct acpi_driver acpi_power_driver = { |
c2b6705b | 76 | .name = "power", |
4be44fcd | 77 | .class = ACPI_POWER_CLASS, |
1ba90e3a | 78 | .ids = power_device_ids, |
4be44fcd LB |
79 | .ops = { |
80 | .add = acpi_power_add, | |
81 | .remove = acpi_power_remove, | |
82 | }, | |
e579e2dd | 83 | .drv.pm = &acpi_power_pm, |
1da177e4 LT |
84 | }; |
85 | ||
0090def6 LM |
86 | /* |
87 | * A power managed device | |
88 | * A device may rely on multiple power resources. | |
89 | * */ | |
90 | struct acpi_power_managed_device { | |
91 | struct device *dev; /* The physical device */ | |
92 | acpi_handle *handle; | |
93 | }; | |
94 | ||
95 | struct acpi_power_resource_device { | |
96 | struct acpi_power_managed_device *device; | |
97 | struct acpi_power_resource_device *next; | |
98 | }; | |
99 | ||
4be44fcd | 100 | struct acpi_power_resource { |
41598572 | 101 | struct acpi_device * device; |
4be44fcd LB |
102 | acpi_bus_id name; |
103 | u32 system_level; | |
104 | u32 order; | |
3e384ee6 | 105 | unsigned int ref_count; |
0a613902 | 106 | struct mutex resource_lock; |
0090def6 LM |
107 | |
108 | /* List of devices relying on this power resource */ | |
109 | struct acpi_power_resource_device *devices; | |
40bf66ec | 110 | struct mutex devices_lock; |
1da177e4 LT |
111 | }; |
112 | ||
4be44fcd | 113 | static struct list_head acpi_power_resource_list; |
1da177e4 | 114 | |
1da177e4 LT |
115 | /* -------------------------------------------------------------------------- |
116 | Power Resource Management | |
117 | -------------------------------------------------------------------------- */ | |
118 | ||
119 | static int | |
4be44fcd LB |
120 | acpi_power_get_context(acpi_handle handle, |
121 | struct acpi_power_resource **resource) | |
1da177e4 | 122 | { |
4be44fcd LB |
123 | int result = 0; |
124 | struct acpi_device *device = NULL; | |
1da177e4 | 125 | |
1da177e4 LT |
126 | |
127 | if (!resource) | |
d550d98d | 128 | return -ENODEV; |
1da177e4 LT |
129 | |
130 | result = acpi_bus_get_device(handle, &device); | |
131 | if (result) { | |
cece9296 | 132 | printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle); |
d550d98d | 133 | return result; |
1da177e4 LT |
134 | } |
135 | ||
50dd0969 | 136 | *resource = acpi_driver_data(device); |
a815ab8b | 137 | if (!*resource) |
d550d98d | 138 | return -ENODEV; |
1da177e4 | 139 | |
d550d98d | 140 | return 0; |
1da177e4 LT |
141 | } |
142 | ||
a51e145f | 143 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 144 | { |
4be44fcd | 145 | acpi_status status = AE_OK; |
27663c58 | 146 | unsigned long long sta = 0; |
60a4ce7f LM |
147 | char node_name[5]; |
148 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 149 | |
1da177e4 | 150 | |
a51e145f | 151 | if (!handle || !state) |
d550d98d | 152 | return -EINVAL; |
1da177e4 | 153 | |
a51e145f | 154 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 155 | if (ACPI_FAILURE(status)) |
d550d98d | 156 | return -ENODEV; |
1da177e4 | 157 | |
c35923bc AS |
158 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
159 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 160 | |
60a4ce7f LM |
161 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
162 | ||
1da177e4 | 163 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 164 | node_name, |
b1b57fbe | 165 | *state ? "on" : "off")); |
1da177e4 | 166 | |
d550d98d | 167 | return 0; |
1da177e4 LT |
168 | } |
169 | ||
4be44fcd | 170 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 171 | { |
d0515d9f RW |
172 | int cur_state; |
173 | int i = 0; | |
1da177e4 LT |
174 | |
175 | if (!list || !state) | |
d550d98d | 176 | return -EINVAL; |
1da177e4 LT |
177 | |
178 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
179 | ||
4be44fcd | 180 | for (i = 0; i < list->count; i++) { |
d0515d9f RW |
181 | struct acpi_power_resource *resource; |
182 | acpi_handle handle = list->handles[i]; | |
183 | int result; | |
184 | ||
185 | result = acpi_power_get_context(handle, &resource); | |
1da177e4 | 186 | if (result) |
d550d98d | 187 | return result; |
1da177e4 | 188 | |
d0515d9f RW |
189 | mutex_lock(&resource->resource_lock); |
190 | ||
191 | result = acpi_power_get_state(handle, &cur_state); | |
1da177e4 | 192 | |
d0515d9f RW |
193 | mutex_unlock(&resource->resource_lock); |
194 | ||
195 | if (result) | |
196 | return result; | |
197 | ||
198 | if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) | |
1da177e4 LT |
199 | break; |
200 | } | |
201 | ||
202 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
d0515d9f | 203 | cur_state ? "on" : "off")); |
1da177e4 | 204 | |
d0515d9f RW |
205 | *state = cur_state; |
206 | ||
207 | return 0; | |
1da177e4 LT |
208 | } |
209 | ||
0090def6 LM |
210 | /* Resume the device when all power resources in _PR0 are on */ |
211 | static void acpi_power_on_device(struct acpi_power_managed_device *device) | |
212 | { | |
213 | struct acpi_device *acpi_dev; | |
214 | acpi_handle handle = device->handle; | |
215 | int state; | |
216 | ||
217 | if (acpi_bus_get_device(handle, &acpi_dev)) | |
218 | return; | |
219 | ||
220 | if(acpi_power_get_inferred_state(acpi_dev, &state)) | |
221 | return; | |
222 | ||
223 | if (state == ACPI_STATE_D0 && pm_runtime_suspended(device->dev)) | |
224 | pm_request_resume(device->dev); | |
225 | } | |
226 | ||
3e384ee6 | 227 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 228 | { |
4be44fcd | 229 | acpi_status status = AE_OK; |
1da177e4 | 230 | |
3e384ee6 RW |
231 | status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL); |
232 | if (ACPI_FAILURE(status)) | |
233 | return -ENODEV; | |
234 | ||
235 | /* Update the power resource's _device_ power state */ | |
236 | resource->device->power.state = ACPI_STATE_D0; | |
237 | ||
238 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", | |
239 | resource->name)); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int acpi_power_on(acpi_handle handle) | |
245 | { | |
246 | int result = 0; | |
40bf66ec | 247 | bool resume_device = false; |
3e384ee6 | 248 | struct acpi_power_resource *resource = NULL; |
40bf66ec | 249 | struct acpi_power_resource_device *device_list; |
1da177e4 LT |
250 | |
251 | result = acpi_power_get_context(handle, &resource); | |
252 | if (result) | |
d550d98d | 253 | return result; |
1da177e4 | 254 | |
0a613902 | 255 | mutex_lock(&resource->resource_lock); |
0a613902 | 256 | |
3e384ee6 RW |
257 | if (resource->ref_count++) { |
258 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
259 | "Power resource [%s] already on", | |
260 | resource->name)); | |
261 | } else { | |
262 | result = __acpi_power_on(resource); | |
12b3b5af RW |
263 | if (result) |
264 | resource->ref_count--; | |
40bf66ec LM |
265 | else |
266 | resume_device = true; | |
0a613902 | 267 | } |
1da177e4 | 268 | |
3e384ee6 | 269 | mutex_unlock(&resource->resource_lock); |
1da177e4 | 270 | |
40bf66ec LM |
271 | if (!resume_device) |
272 | return result; | |
273 | ||
274 | mutex_lock(&resource->devices_lock); | |
275 | ||
276 | device_list = resource->devices; | |
277 | while (device_list) { | |
278 | acpi_power_on_device(device_list->device); | |
279 | device_list = device_list->next; | |
280 | } | |
281 | ||
282 | mutex_unlock(&resource->devices_lock); | |
283 | ||
12b3b5af | 284 | return result; |
1da177e4 LT |
285 | } |
286 | ||
36237fa0 | 287 | static int acpi_power_off(acpi_handle handle) |
1da177e4 | 288 | { |
bdf43bbf | 289 | int result = 0; |
4be44fcd | 290 | acpi_status status = AE_OK; |
1da177e4 | 291 | struct acpi_power_resource *resource = NULL; |
0a613902 | 292 | |
1da177e4 LT |
293 | result = acpi_power_get_context(handle, &resource); |
294 | if (result) | |
d550d98d | 295 | return result; |
1da177e4 | 296 | |
0a613902 | 297 | mutex_lock(&resource->resource_lock); |
3e384ee6 RW |
298 | |
299 | if (!resource->ref_count) { | |
300 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
301 | "Power resource [%s] already off", | |
302 | resource->name)); | |
303 | goto unlock; | |
0a613902 | 304 | } |
1da177e4 | 305 | |
3e384ee6 RW |
306 | if (--resource->ref_count) { |
307 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
308 | "Power resource [%s] still in use\n", | |
309 | resource->name)); | |
310 | goto unlock; | |
1da177e4 LT |
311 | } |
312 | ||
5fbc19ef | 313 | status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL); |
3e384ee6 RW |
314 | if (ACPI_FAILURE(status)) { |
315 | result = -ENODEV; | |
316 | } else { | |
317 | /* Update the power resource's _device_ power state */ | |
318 | resource->device->power.state = ACPI_STATE_D3; | |
1da177e4 | 319 | |
3e384ee6 RW |
320 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
321 | "Power resource [%s] turned off\n", | |
322 | resource->name)); | |
323 | } | |
1da177e4 | 324 | |
3e384ee6 RW |
325 | unlock: |
326 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 327 | |
3e384ee6 | 328 | return result; |
1da177e4 LT |
329 | } |
330 | ||
d2ef555b RW |
331 | static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res) |
332 | { | |
333 | int i; | |
334 | ||
335 | for (i = num_res - 1; i >= 0 ; i--) | |
36237fa0 | 336 | acpi_power_off(list->handles[i]); |
d2ef555b RW |
337 | } |
338 | ||
339 | static void acpi_power_off_list(struct acpi_handle_list *list) | |
340 | { | |
341 | __acpi_power_off_list(list, list->count); | |
342 | } | |
343 | ||
344 | static int acpi_power_on_list(struct acpi_handle_list *list) | |
345 | { | |
346 | int result = 0; | |
347 | int i; | |
348 | ||
349 | for (i = 0; i < list->count; i++) { | |
350 | result = acpi_power_on(list->handles[i]); | |
351 | if (result) { | |
352 | __acpi_power_off_list(list, i); | |
353 | break; | |
354 | } | |
355 | } | |
356 | ||
357 | return result; | |
358 | } | |
359 | ||
0090def6 LM |
360 | static void __acpi_power_resource_unregister_device(struct device *dev, |
361 | acpi_handle res_handle) | |
362 | { | |
363 | struct acpi_power_resource *resource = NULL; | |
364 | struct acpi_power_resource_device *prev, *curr; | |
365 | ||
366 | if (acpi_power_get_context(res_handle, &resource)) | |
367 | return; | |
368 | ||
40bf66ec | 369 | mutex_lock(&resource->devices_lock); |
0090def6 LM |
370 | prev = NULL; |
371 | curr = resource->devices; | |
372 | while (curr) { | |
373 | if (curr->device->dev == dev) { | |
374 | if (!prev) | |
375 | resource->devices = curr->next; | |
376 | else | |
377 | prev->next = curr->next; | |
378 | ||
379 | kfree(curr); | |
380 | break; | |
381 | } | |
382 | ||
383 | prev = curr; | |
384 | curr = curr->next; | |
385 | } | |
40bf66ec | 386 | mutex_unlock(&resource->devices_lock); |
0090def6 LM |
387 | } |
388 | ||
389 | /* Unlink dev from all power resources in _PR0 */ | |
390 | void acpi_power_resource_unregister_device(struct device *dev, acpi_handle handle) | |
391 | { | |
392 | struct acpi_device *acpi_dev; | |
393 | struct acpi_handle_list *list; | |
394 | int i; | |
395 | ||
396 | if (!dev || !handle) | |
397 | return; | |
398 | ||
399 | if (acpi_bus_get_device(handle, &acpi_dev)) | |
400 | return; | |
401 | ||
402 | list = &acpi_dev->power.states[ACPI_STATE_D0].resources; | |
403 | ||
404 | for (i = 0; i < list->count; i++) | |
405 | __acpi_power_resource_unregister_device(dev, | |
406 | list->handles[i]); | |
407 | } | |
a606dac3 | 408 | EXPORT_SYMBOL_GPL(acpi_power_resource_unregister_device); |
0090def6 LM |
409 | |
410 | static int __acpi_power_resource_register_device( | |
411 | struct acpi_power_managed_device *powered_device, acpi_handle handle) | |
412 | { | |
413 | struct acpi_power_resource *resource = NULL; | |
414 | struct acpi_power_resource_device *power_resource_device; | |
415 | int result; | |
416 | ||
417 | result = acpi_power_get_context(handle, &resource); | |
418 | if (result) | |
419 | return result; | |
420 | ||
421 | power_resource_device = kzalloc( | |
422 | sizeof(*power_resource_device), GFP_KERNEL); | |
423 | if (!power_resource_device) | |
424 | return -ENOMEM; | |
425 | ||
426 | power_resource_device->device = powered_device; | |
427 | ||
40bf66ec | 428 | mutex_lock(&resource->devices_lock); |
0090def6 LM |
429 | power_resource_device->next = resource->devices; |
430 | resource->devices = power_resource_device; | |
40bf66ec | 431 | mutex_unlock(&resource->devices_lock); |
0090def6 LM |
432 | |
433 | return 0; | |
434 | } | |
435 | ||
436 | /* Link dev to all power resources in _PR0 */ | |
437 | int acpi_power_resource_register_device(struct device *dev, acpi_handle handle) | |
438 | { | |
439 | struct acpi_device *acpi_dev; | |
440 | struct acpi_handle_list *list; | |
441 | struct acpi_power_managed_device *powered_device; | |
442 | int i, ret; | |
443 | ||
444 | if (!dev || !handle) | |
445 | return -ENODEV; | |
446 | ||
447 | ret = acpi_bus_get_device(handle, &acpi_dev); | |
448 | if (ret) | |
449 | goto no_power_resource; | |
450 | ||
451 | if (!acpi_dev->power.flags.power_resources) | |
452 | goto no_power_resource; | |
453 | ||
454 | powered_device = kzalloc(sizeof(*powered_device), GFP_KERNEL); | |
455 | if (!powered_device) | |
456 | return -ENOMEM; | |
457 | ||
458 | powered_device->dev = dev; | |
459 | powered_device->handle = handle; | |
460 | ||
461 | list = &acpi_dev->power.states[ACPI_STATE_D0].resources; | |
462 | ||
463 | for (i = 0; i < list->count; i++) { | |
464 | ret = __acpi_power_resource_register_device(powered_device, | |
465 | list->handles[i]); | |
466 | ||
467 | if (ret) { | |
468 | acpi_power_resource_unregister_device(dev, handle); | |
469 | break; | |
470 | } | |
471 | } | |
472 | ||
473 | return ret; | |
474 | ||
475 | no_power_resource: | |
acacb5f2 | 476 | printk(KERN_DEBUG PREFIX "Invalid Power Resource to register!\n"); |
0090def6 LM |
477 | return -ENODEV; |
478 | } | |
a606dac3 | 479 | EXPORT_SYMBOL_GPL(acpi_power_resource_register_device); |
0090def6 | 480 | |
77e76609 RW |
481 | /** |
482 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
483 | * ACPI 3.0) _PSW (Power State Wake) | |
484 | * @dev: Device to handle. | |
485 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
486 | * @sleep_state: Target sleep state of the system. | |
487 | * @dev_state: Target power state of the device. | |
488 | * | |
489 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
490 | * State Wake) for the device, if present. On failure reset the device's | |
491 | * wakeup.flags.valid flag. | |
492 | * | |
493 | * RETURN VALUE: | |
494 | * 0 if either _DSW or _PSW has been successfully executed | |
495 | * 0 if neither _DSW nor _PSW has been found | |
496 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
497 | */ | |
498 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
499 | int enable, int sleep_state, int dev_state) | |
500 | { | |
501 | union acpi_object in_arg[3]; | |
502 | struct acpi_object_list arg_list = { 3, in_arg }; | |
503 | acpi_status status = AE_OK; | |
504 | ||
505 | /* | |
506 | * Try to execute _DSW first. | |
507 | * | |
508 | * Three agruments are needed for the _DSW object: | |
509 | * Argument 0: enable/disable the wake capabilities | |
510 | * Argument 1: target system state | |
511 | * Argument 2: target device state | |
512 | * When _DSW object is called to disable the wake capabilities, maybe | |
513 | * the first argument is filled. The values of the other two agruments | |
514 | * are meaningless. | |
515 | */ | |
516 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
517 | in_arg[0].integer.value = enable; | |
518 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
519 | in_arg[1].integer.value = sleep_state; | |
520 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
521 | in_arg[2].integer.value = dev_state; | |
522 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
523 | if (ACPI_SUCCESS(status)) { | |
524 | return 0; | |
525 | } else if (status != AE_NOT_FOUND) { | |
526 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
527 | dev->wakeup.flags.valid = 0; | |
528 | return -ENODEV; | |
529 | } | |
530 | ||
531 | /* Execute _PSW */ | |
532 | arg_list.count = 1; | |
533 | in_arg[0].integer.value = enable; | |
534 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
535 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
536 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
537 | dev->wakeup.flags.valid = 0; | |
538 | return -ENODEV; | |
539 | } | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
1da177e4 LT |
544 | /* |
545 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
546 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
547 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
548 | * State Wake) for the device, if present | |
1da177e4 | 549 | */ |
77e76609 | 550 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 551 | { |
9b83ccd2 | 552 | int i, err = 0; |
1da177e4 | 553 | |
1da177e4 | 554 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 555 | return -EINVAL; |
1da177e4 | 556 | |
9b83ccd2 RW |
557 | mutex_lock(&acpi_device_lock); |
558 | ||
559 | if (dev->wakeup.prepare_count++) | |
560 | goto out; | |
0af4b8c4 | 561 | |
1da177e4 LT |
562 | /* Open power resource */ |
563 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
3e384ee6 | 564 | int ret = acpi_power_on(dev->wakeup.resources.handles[i]); |
1da177e4 | 565 | if (ret) { |
6468463a | 566 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 567 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
568 | err = -ENODEV; |
569 | goto err_out; | |
1da177e4 LT |
570 | } |
571 | } | |
572 | ||
77e76609 RW |
573 | /* |
574 | * Passing 3 as the third argument below means the device may be placed | |
575 | * in arbitrary power state afterwards. | |
576 | */ | |
0af4b8c4 | 577 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); |
0af4b8c4 | 578 | |
9b83ccd2 RW |
579 | err_out: |
580 | if (err) | |
581 | dev->wakeup.prepare_count = 0; | |
582 | ||
583 | out: | |
584 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 585 | return err; |
1da177e4 LT |
586 | } |
587 | ||
588 | /* | |
589 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
590 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
591 | * State Wake) for the device, if present | |
1da177e4 LT |
592 | * 2. Shutdown down the power resources |
593 | */ | |
4be44fcd | 594 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 595 | { |
9b83ccd2 | 596 | int i, err = 0; |
1da177e4 LT |
597 | |
598 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 599 | return -EINVAL; |
1da177e4 | 600 | |
9b83ccd2 RW |
601 | mutex_lock(&acpi_device_lock); |
602 | ||
603 | if (--dev->wakeup.prepare_count > 0) | |
604 | goto out; | |
605 | ||
0af4b8c4 | 606 | /* |
9b83ccd2 RW |
607 | * Executing the code below even if prepare_count is already zero when |
608 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 609 | */ |
9b83ccd2 RW |
610 | if (dev->wakeup.prepare_count < 0) |
611 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 612 | |
9b83ccd2 RW |
613 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
614 | if (err) | |
615 | goto out; | |
1da177e4 LT |
616 | |
617 | /* Close power resource */ | |
618 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
36237fa0 | 619 | int ret = acpi_power_off(dev->wakeup.resources.handles[i]); |
1da177e4 | 620 | if (ret) { |
6468463a | 621 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 622 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
623 | err = -ENODEV; |
624 | goto out; | |
1da177e4 LT |
625 | } |
626 | } | |
627 | ||
9b83ccd2 RW |
628 | out: |
629 | mutex_unlock(&acpi_device_lock); | |
630 | return err; | |
1da177e4 LT |
631 | } |
632 | ||
633 | /* -------------------------------------------------------------------------- | |
634 | Device Power Management | |
635 | -------------------------------------------------------------------------- */ | |
636 | ||
32a00d27 | 637 | int acpi_power_get_inferred_state(struct acpi_device *device, int *state) |
1da177e4 | 638 | { |
4be44fcd LB |
639 | int result = 0; |
640 | struct acpi_handle_list *list = NULL; | |
641 | int list_state = 0; | |
642 | int i = 0; | |
1da177e4 | 643 | |
32a00d27 | 644 | if (!device || !state) |
d550d98d | 645 | return -EINVAL; |
1da177e4 | 646 | |
1da177e4 LT |
647 | /* |
648 | * We know a device's inferred power state when all the resources | |
649 | * required for a given D-state are 'on'. | |
650 | */ | |
38c92fff | 651 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { |
1da177e4 LT |
652 | list = &device->power.states[i].resources; |
653 | if (list->count < 1) | |
654 | continue; | |
655 | ||
656 | result = acpi_power_get_list_state(list, &list_state); | |
657 | if (result) | |
d550d98d | 658 | return result; |
1da177e4 LT |
659 | |
660 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
32a00d27 | 661 | *state = i; |
d550d98d | 662 | return 0; |
1da177e4 LT |
663 | } |
664 | } | |
665 | ||
32a00d27 | 666 | *state = ACPI_STATE_D3; |
d550d98d | 667 | return 0; |
1da177e4 LT |
668 | } |
669 | ||
30d3df41 RW |
670 | int acpi_power_on_resources(struct acpi_device *device, int state) |
671 | { | |
672 | if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3) | |
673 | return -EINVAL; | |
674 | ||
675 | return acpi_power_on_list(&device->power.states[state].resources); | |
676 | } | |
677 | ||
4be44fcd | 678 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 679 | { |
5c7dd710 | 680 | int result = 0; |
1da177e4 | 681 | |
3ebc81b8 | 682 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) |
d550d98d | 683 | return -EINVAL; |
1da177e4 | 684 | |
212967c6 RW |
685 | if (device->power.state == state) |
686 | return 0; | |
687 | ||
4be44fcd | 688 | if ((device->power.state < ACPI_STATE_D0) |
3ebc81b8 | 689 | || (device->power.state > ACPI_STATE_D3_COLD)) |
d550d98d | 690 | return -ENODEV; |
1da177e4 | 691 | |
1da177e4 LT |
692 | /* TBD: Resources must be ordered. */ |
693 | ||
694 | /* | |
695 | * First we reference all power resources required in the target list | |
d2ef555b RW |
696 | * (e.g. so the device doesn't lose power while transitioning). Then, |
697 | * we dereference all power resources used in the current list. | |
1da177e4 | 698 | */ |
5c7dd710 RW |
699 | if (state < ACPI_STATE_D3_COLD) |
700 | result = acpi_power_on_list( | |
701 | &device->power.states[state].resources); | |
702 | ||
703 | if (!result && device->power.state < ACPI_STATE_D3_COLD) | |
d2ef555b RW |
704 | acpi_power_off_list( |
705 | &device->power.states[device->power.state].resources); | |
1da177e4 | 706 | |
d2ef555b RW |
707 | /* We shouldn't change the state unless the above operations succeed. */ |
708 | device->power.state = result ? ACPI_STATE_UNKNOWN : state; | |
1da177e4 | 709 | |
d550d98d | 710 | return result; |
1da177e4 LT |
711 | } |
712 | ||
1da177e4 LT |
713 | /* -------------------------------------------------------------------------- |
714 | Driver Interface | |
715 | -------------------------------------------------------------------------- */ | |
716 | ||
4be44fcd | 717 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 718 | { |
c35923bc | 719 | int result = 0, state; |
4be44fcd | 720 | acpi_status status = AE_OK; |
1da177e4 | 721 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
722 | union acpi_object acpi_object; |
723 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 724 | |
1da177e4 LT |
725 | |
726 | if (!device) | |
d550d98d | 727 | return -EINVAL; |
1da177e4 | 728 | |
36bcbec7 | 729 | resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); |
1da177e4 | 730 | if (!resource) |
d550d98d | 731 | return -ENOMEM; |
1da177e4 | 732 | |
41598572 | 733 | resource->device = device; |
0a613902 | 734 | mutex_init(&resource->resource_lock); |
40bf66ec | 735 | mutex_init(&resource->devices_lock); |
1da177e4 LT |
736 | strcpy(resource->name, device->pnp.bus_id); |
737 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
738 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
db89b4f0 | 739 | device->driver_data = resource; |
1da177e4 LT |
740 | |
741 | /* Evalute the object to get the system level and resource order. */ | |
5fbc19ef | 742 | status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer); |
1da177e4 LT |
743 | if (ACPI_FAILURE(status)) { |
744 | result = -ENODEV; | |
745 | goto end; | |
746 | } | |
747 | resource->system_level = acpi_object.power_resource.system_level; | |
748 | resource->order = acpi_object.power_resource.resource_order; | |
749 | ||
a51e145f | 750 | result = acpi_power_get_state(device->handle, &state); |
1da177e4 LT |
751 | if (result) |
752 | goto end; | |
753 | ||
c35923bc | 754 | switch (state) { |
1da177e4 LT |
755 | case ACPI_POWER_RESOURCE_STATE_ON: |
756 | device->power.state = ACPI_STATE_D0; | |
757 | break; | |
758 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
759 | device->power.state = ACPI_STATE_D3; | |
760 | break; | |
761 | default: | |
762 | device->power.state = ACPI_STATE_UNKNOWN; | |
763 | break; | |
764 | } | |
765 | ||
1da177e4 | 766 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 767 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 768 | |
4be44fcd | 769 | end: |
1da177e4 LT |
770 | if (result) |
771 | kfree(resource); | |
4be44fcd | 772 | |
d550d98d | 773 | return result; |
1da177e4 LT |
774 | } |
775 | ||
4be44fcd | 776 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 | 777 | { |
3e384ee6 | 778 | struct acpi_power_resource *resource; |
1da177e4 | 779 | |
3e384ee6 | 780 | if (!device) |
d550d98d | 781 | return -EINVAL; |
1da177e4 | 782 | |
50dd0969 | 783 | resource = acpi_driver_data(device); |
3e384ee6 RW |
784 | if (!resource) |
785 | return -EINVAL; | |
0a613902 | 786 | |
1da177e4 LT |
787 | kfree(resource); |
788 | ||
d550d98d | 789 | return 0; |
1da177e4 LT |
790 | } |
791 | ||
90692404 | 792 | #ifdef CONFIG_PM_SLEEP |
e579e2dd | 793 | static int acpi_power_resume(struct device *dev) |
0a613902 | 794 | { |
c35923bc | 795 | int result = 0, state; |
e579e2dd | 796 | struct acpi_device *device; |
3e384ee6 | 797 | struct acpi_power_resource *resource; |
0a613902 | 798 | |
e579e2dd | 799 | if (!dev) |
0a613902 KK |
800 | return -EINVAL; |
801 | ||
e579e2dd | 802 | device = to_acpi_device(dev); |
db89b4f0 | 803 | resource = acpi_driver_data(device); |
3e384ee6 RW |
804 | if (!resource) |
805 | return -EINVAL; | |
806 | ||
807 | mutex_lock(&resource->resource_lock); | |
0a613902 | 808 | |
a51e145f | 809 | result = acpi_power_get_state(device->handle, &state); |
0a613902 | 810 | if (result) |
3e384ee6 | 811 | goto unlock; |
0a613902 | 812 | |
3e384ee6 RW |
813 | if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count) |
814 | result = __acpi_power_on(resource); | |
0a613902 | 815 | |
3e384ee6 | 816 | unlock: |
0a613902 | 817 | mutex_unlock(&resource->resource_lock); |
3e384ee6 RW |
818 | |
819 | return result; | |
0a613902 | 820 | } |
90692404 | 821 | #endif |
0a613902 | 822 | |
44515374 | 823 | int __init acpi_power_init(void) |
1da177e4 | 824 | { |
1da177e4 | 825 | INIT_LIST_HEAD(&acpi_power_resource_list); |
06af7eb0 | 826 | return acpi_bus_register_driver(&acpi_power_driver); |
1da177e4 | 827 | } |