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