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