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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> |
1da177e4 LT |
43 | #include <acpi/acpi_bus.h> |
44 | #include <acpi/acpi_drivers.h> | |
9b83ccd2 RW |
45 | #include "sleep.h" |
46 | ||
a192a958 LB |
47 | #define PREFIX "ACPI: " |
48 | ||
89595b8f | 49 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 50 | ACPI_MODULE_NAME("power"); |
1da177e4 | 51 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 LT |
52 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
53 | #define ACPI_POWER_FILE_INFO "info" | |
54 | #define ACPI_POWER_FILE_STATUS "state" | |
55 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
56 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
57 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 | 58 | |
f5adfaa3 ZY |
59 | int acpi_power_nocheck; |
60 | module_param_named(power_nocheck, acpi_power_nocheck, bool, 000); | |
61 | ||
4be44fcd LB |
62 | static int acpi_power_add(struct acpi_device *device); |
63 | static int acpi_power_remove(struct acpi_device *device, int type); | |
e8363f33 | 64 | static int acpi_power_resume(struct acpi_device *device); |
1da177e4 | 65 | |
c97adf9e | 66 | static const struct acpi_device_id power_device_ids[] = { |
1ba90e3a TR |
67 | {ACPI_POWER_HID, 0}, |
68 | {"", 0}, | |
69 | }; | |
70 | MODULE_DEVICE_TABLE(acpi, power_device_ids); | |
71 | ||
1da177e4 | 72 | static struct acpi_driver acpi_power_driver = { |
c2b6705b | 73 | .name = "power", |
4be44fcd | 74 | .class = ACPI_POWER_CLASS, |
1ba90e3a | 75 | .ids = power_device_ids, |
4be44fcd LB |
76 | .ops = { |
77 | .add = acpi_power_add, | |
78 | .remove = acpi_power_remove, | |
0a613902 | 79 | .resume = acpi_power_resume, |
4be44fcd | 80 | }, |
1da177e4 LT |
81 | }; |
82 | ||
4be44fcd | 83 | struct acpi_power_resource { |
41598572 | 84 | struct acpi_device * device; |
4be44fcd LB |
85 | acpi_bus_id name; |
86 | u32 system_level; | |
87 | u32 order; | |
3e384ee6 | 88 | unsigned int ref_count; |
0a613902 | 89 | struct mutex resource_lock; |
1da177e4 LT |
90 | }; |
91 | ||
4be44fcd | 92 | static struct list_head acpi_power_resource_list; |
1da177e4 | 93 | |
1da177e4 LT |
94 | /* -------------------------------------------------------------------------- |
95 | Power Resource Management | |
96 | -------------------------------------------------------------------------- */ | |
97 | ||
98 | static int | |
4be44fcd LB |
99 | acpi_power_get_context(acpi_handle handle, |
100 | struct acpi_power_resource **resource) | |
1da177e4 | 101 | { |
4be44fcd LB |
102 | int result = 0; |
103 | struct acpi_device *device = NULL; | |
1da177e4 | 104 | |
1da177e4 LT |
105 | |
106 | if (!resource) | |
d550d98d | 107 | return -ENODEV; |
1da177e4 LT |
108 | |
109 | result = acpi_bus_get_device(handle, &device); | |
110 | if (result) { | |
cece9296 | 111 | printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle); |
d550d98d | 112 | return result; |
1da177e4 LT |
113 | } |
114 | ||
50dd0969 | 115 | *resource = acpi_driver_data(device); |
a815ab8b | 116 | if (!*resource) |
d550d98d | 117 | return -ENODEV; |
1da177e4 | 118 | |
d550d98d | 119 | return 0; |
1da177e4 LT |
120 | } |
121 | ||
a51e145f | 122 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 123 | { |
4be44fcd | 124 | acpi_status status = AE_OK; |
27663c58 | 125 | unsigned long long sta = 0; |
60a4ce7f LM |
126 | char node_name[5]; |
127 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 128 | |
1da177e4 | 129 | |
a51e145f | 130 | if (!handle || !state) |
d550d98d | 131 | return -EINVAL; |
1da177e4 | 132 | |
a51e145f | 133 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 134 | if (ACPI_FAILURE(status)) |
d550d98d | 135 | return -ENODEV; |
1da177e4 | 136 | |
c35923bc AS |
137 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
138 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 139 | |
60a4ce7f LM |
140 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
141 | ||
1da177e4 | 142 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 143 | node_name, |
b1b57fbe | 144 | *state ? "on" : "off")); |
1da177e4 | 145 | |
d550d98d | 146 | return 0; |
1da177e4 LT |
147 | } |
148 | ||
4be44fcd | 149 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 150 | { |
c35923bc | 151 | int result = 0, state1; |
4be44fcd | 152 | u32 i = 0; |
1da177e4 | 153 | |
1da177e4 LT |
154 | |
155 | if (!list || !state) | |
d550d98d | 156 | return -EINVAL; |
1da177e4 LT |
157 | |
158 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
159 | ||
4be44fcd | 160 | for (i = 0; i < list->count; i++) { |
a51e145f ZY |
161 | /* |
162 | * The state of the power resource can be obtained by | |
163 | * using the ACPI handle. In such case it is unnecessary to | |
164 | * get the Power resource first and then get its state again. | |
165 | */ | |
166 | result = acpi_power_get_state(list->handles[i], &state1); | |
1da177e4 | 167 | if (result) |
d550d98d | 168 | return result; |
1da177e4 | 169 | |
c35923bc | 170 | *state = state1; |
1da177e4 LT |
171 | |
172 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
173 | break; | |
174 | } | |
175 | ||
176 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 177 | *state ? "on" : "off")); |
1da177e4 | 178 | |
d550d98d | 179 | return result; |
1da177e4 LT |
180 | } |
181 | ||
3e384ee6 | 182 | static int __acpi_power_on(struct acpi_power_resource *resource) |
1da177e4 | 183 | { |
4be44fcd | 184 | acpi_status status = AE_OK; |
1da177e4 | 185 | |
3e384ee6 RW |
186 | status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL); |
187 | if (ACPI_FAILURE(status)) | |
188 | return -ENODEV; | |
189 | ||
190 | /* Update the power resource's _device_ power state */ | |
191 | resource->device->power.state = ACPI_STATE_D0; | |
192 | ||
193 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n", | |
194 | resource->name)); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int acpi_power_on(acpi_handle handle) | |
200 | { | |
201 | int result = 0; | |
202 | struct acpi_power_resource *resource = NULL; | |
1da177e4 LT |
203 | |
204 | result = acpi_power_get_context(handle, &resource); | |
205 | if (result) | |
d550d98d | 206 | return result; |
1da177e4 | 207 | |
0a613902 | 208 | mutex_lock(&resource->resource_lock); |
0a613902 | 209 | |
3e384ee6 RW |
210 | if (resource->ref_count++) { |
211 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
212 | "Power resource [%s] already on", | |
213 | resource->name)); | |
214 | } else { | |
215 | result = __acpi_power_on(resource); | |
12b3b5af RW |
216 | if (result) |
217 | resource->ref_count--; | |
0a613902 | 218 | } |
1da177e4 | 219 | |
3e384ee6 | 220 | mutex_unlock(&resource->resource_lock); |
1da177e4 | 221 | |
12b3b5af | 222 | return result; |
1da177e4 LT |
223 | } |
224 | ||
3e384ee6 | 225 | static int acpi_power_off_device(acpi_handle handle) |
1da177e4 | 226 | { |
bdf43bbf | 227 | int result = 0; |
4be44fcd | 228 | acpi_status status = AE_OK; |
1da177e4 | 229 | struct acpi_power_resource *resource = NULL; |
0a613902 | 230 | |
1da177e4 LT |
231 | result = acpi_power_get_context(handle, &resource); |
232 | if (result) | |
d550d98d | 233 | return result; |
1da177e4 | 234 | |
0a613902 | 235 | mutex_lock(&resource->resource_lock); |
3e384ee6 RW |
236 | |
237 | if (!resource->ref_count) { | |
238 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
239 | "Power resource [%s] already off", | |
240 | resource->name)); | |
241 | goto unlock; | |
0a613902 | 242 | } |
1da177e4 | 243 | |
3e384ee6 RW |
244 | if (--resource->ref_count) { |
245 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
246 | "Power resource [%s] still in use\n", | |
247 | resource->name)); | |
248 | goto unlock; | |
1da177e4 LT |
249 | } |
250 | ||
5fbc19ef | 251 | status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL); |
3e384ee6 RW |
252 | if (ACPI_FAILURE(status)) { |
253 | result = -ENODEV; | |
254 | } else { | |
255 | /* Update the power resource's _device_ power state */ | |
256 | resource->device->power.state = ACPI_STATE_D3; | |
1da177e4 | 257 | |
3e384ee6 RW |
258 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
259 | "Power resource [%s] turned off\n", | |
260 | resource->name)); | |
261 | } | |
1da177e4 | 262 | |
3e384ee6 RW |
263 | unlock: |
264 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 265 | |
3e384ee6 | 266 | return result; |
1da177e4 LT |
267 | } |
268 | ||
77e76609 RW |
269 | /** |
270 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
271 | * ACPI 3.0) _PSW (Power State Wake) | |
272 | * @dev: Device to handle. | |
273 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
274 | * @sleep_state: Target sleep state of the system. | |
275 | * @dev_state: Target power state of the device. | |
276 | * | |
277 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
278 | * State Wake) for the device, if present. On failure reset the device's | |
279 | * wakeup.flags.valid flag. | |
280 | * | |
281 | * RETURN VALUE: | |
282 | * 0 if either _DSW or _PSW has been successfully executed | |
283 | * 0 if neither _DSW nor _PSW has been found | |
284 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
285 | */ | |
286 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
287 | int enable, int sleep_state, int dev_state) | |
288 | { | |
289 | union acpi_object in_arg[3]; | |
290 | struct acpi_object_list arg_list = { 3, in_arg }; | |
291 | acpi_status status = AE_OK; | |
292 | ||
293 | /* | |
294 | * Try to execute _DSW first. | |
295 | * | |
296 | * Three agruments are needed for the _DSW object: | |
297 | * Argument 0: enable/disable the wake capabilities | |
298 | * Argument 1: target system state | |
299 | * Argument 2: target device state | |
300 | * When _DSW object is called to disable the wake capabilities, maybe | |
301 | * the first argument is filled. The values of the other two agruments | |
302 | * are meaningless. | |
303 | */ | |
304 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
305 | in_arg[0].integer.value = enable; | |
306 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
307 | in_arg[1].integer.value = sleep_state; | |
308 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
309 | in_arg[2].integer.value = dev_state; | |
310 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
311 | if (ACPI_SUCCESS(status)) { | |
312 | return 0; | |
313 | } else if (status != AE_NOT_FOUND) { | |
314 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
315 | dev->wakeup.flags.valid = 0; | |
316 | return -ENODEV; | |
317 | } | |
318 | ||
319 | /* Execute _PSW */ | |
320 | arg_list.count = 1; | |
321 | in_arg[0].integer.value = enable; | |
322 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
323 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
324 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
325 | dev->wakeup.flags.valid = 0; | |
326 | return -ENODEV; | |
327 | } | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
1da177e4 LT |
332 | /* |
333 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
334 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
335 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
336 | * State Wake) for the device, if present | |
1da177e4 | 337 | */ |
77e76609 | 338 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 339 | { |
9b83ccd2 | 340 | int i, err = 0; |
1da177e4 | 341 | |
1da177e4 | 342 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 343 | return -EINVAL; |
1da177e4 | 344 | |
9b83ccd2 RW |
345 | mutex_lock(&acpi_device_lock); |
346 | ||
347 | if (dev->wakeup.prepare_count++) | |
348 | goto out; | |
0af4b8c4 | 349 | |
1da177e4 LT |
350 | /* Open power resource */ |
351 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
3e384ee6 | 352 | int ret = acpi_power_on(dev->wakeup.resources.handles[i]); |
1da177e4 | 353 | if (ret) { |
6468463a | 354 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 355 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
356 | err = -ENODEV; |
357 | goto err_out; | |
1da177e4 LT |
358 | } |
359 | } | |
360 | ||
77e76609 RW |
361 | /* |
362 | * Passing 3 as the third argument below means the device may be placed | |
363 | * in arbitrary power state afterwards. | |
364 | */ | |
0af4b8c4 | 365 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); |
0af4b8c4 | 366 | |
9b83ccd2 RW |
367 | err_out: |
368 | if (err) | |
369 | dev->wakeup.prepare_count = 0; | |
370 | ||
371 | out: | |
372 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 373 | return err; |
1da177e4 LT |
374 | } |
375 | ||
376 | /* | |
377 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
378 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
379 | * State Wake) for the device, if present | |
1da177e4 LT |
380 | * 2. Shutdown down the power resources |
381 | */ | |
4be44fcd | 382 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 383 | { |
9b83ccd2 | 384 | int i, err = 0; |
1da177e4 LT |
385 | |
386 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 387 | return -EINVAL; |
1da177e4 | 388 | |
9b83ccd2 RW |
389 | mutex_lock(&acpi_device_lock); |
390 | ||
391 | if (--dev->wakeup.prepare_count > 0) | |
392 | goto out; | |
393 | ||
0af4b8c4 | 394 | /* |
9b83ccd2 RW |
395 | * Executing the code below even if prepare_count is already zero when |
396 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 397 | */ |
9b83ccd2 RW |
398 | if (dev->wakeup.prepare_count < 0) |
399 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 400 | |
9b83ccd2 RW |
401 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
402 | if (err) | |
403 | goto out; | |
1da177e4 LT |
404 | |
405 | /* Close power resource */ | |
406 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
9b83ccd2 | 407 | int ret = acpi_power_off_device( |
3e384ee6 | 408 | dev->wakeup.resources.handles[i]); |
1da177e4 | 409 | if (ret) { |
6468463a | 410 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 411 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
412 | err = -ENODEV; |
413 | goto out; | |
1da177e4 LT |
414 | } |
415 | } | |
416 | ||
9b83ccd2 RW |
417 | out: |
418 | mutex_unlock(&acpi_device_lock); | |
419 | return err; | |
1da177e4 LT |
420 | } |
421 | ||
422 | /* -------------------------------------------------------------------------- | |
423 | Device Power Management | |
424 | -------------------------------------------------------------------------- */ | |
425 | ||
4be44fcd | 426 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 427 | { |
4be44fcd LB |
428 | int result = 0; |
429 | struct acpi_handle_list *list = NULL; | |
430 | int list_state = 0; | |
431 | int i = 0; | |
1da177e4 | 432 | |
1da177e4 LT |
433 | |
434 | if (!device) | |
d550d98d | 435 | return -EINVAL; |
1da177e4 LT |
436 | |
437 | device->power.state = ACPI_STATE_UNKNOWN; | |
438 | ||
439 | /* | |
440 | * We know a device's inferred power state when all the resources | |
441 | * required for a given D-state are 'on'. | |
442 | */ | |
4be44fcd | 443 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
444 | list = &device->power.states[i].resources; |
445 | if (list->count < 1) | |
446 | continue; | |
447 | ||
448 | result = acpi_power_get_list_state(list, &list_state); | |
449 | if (result) | |
d550d98d | 450 | return result; |
1da177e4 LT |
451 | |
452 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
453 | device->power.state = i; | |
d550d98d | 454 | return 0; |
1da177e4 LT |
455 | } |
456 | } | |
457 | ||
458 | device->power.state = ACPI_STATE_D3; | |
459 | ||
d550d98d | 460 | return 0; |
1da177e4 LT |
461 | } |
462 | ||
4be44fcd | 463 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 464 | { |
4be44fcd LB |
465 | int result = 0; |
466 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
467 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
468 | int i = 0; | |
1da177e4 | 469 | |
1da177e4 | 470 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) |
d550d98d | 471 | return -EINVAL; |
1da177e4 | 472 | |
212967c6 RW |
473 | if (device->power.state == state) |
474 | return 0; | |
475 | ||
4be44fcd LB |
476 | if ((device->power.state < ACPI_STATE_D0) |
477 | || (device->power.state > ACPI_STATE_D3)) | |
d550d98d | 478 | return -ENODEV; |
1da177e4 LT |
479 | |
480 | cl = &device->power.states[device->power.state].resources; | |
481 | tl = &device->power.states[state].resources; | |
482 | ||
1da177e4 LT |
483 | /* TBD: Resources must be ordered. */ |
484 | ||
485 | /* | |
486 | * First we reference all power resources required in the target list | |
487 | * (e.g. so the device doesn't lose power while transitioning). | |
488 | */ | |
4be44fcd | 489 | for (i = 0; i < tl->count; i++) { |
3e384ee6 | 490 | result = acpi_power_on(tl->handles[i]); |
1da177e4 LT |
491 | if (result) |
492 | goto end; | |
493 | } | |
494 | ||
495 | /* | |
496 | * Then we dereference all power resources used in the current list. | |
497 | */ | |
4be44fcd | 498 | for (i = 0; i < cl->count; i++) { |
3e384ee6 | 499 | result = acpi_power_off_device(cl->handles[i]); |
1da177e4 LT |
500 | if (result) |
501 | goto end; | |
502 | } | |
503 | ||
72925760 | 504 | end: |
e76d5f7e | 505 | if (result) |
72925760 | 506 | device->power.state = ACPI_STATE_UNKNOWN; |
e76d5f7e | 507 | else { |
72925760 KK |
508 | /* We shouldn't change the state till all above operations succeed */ |
509 | device->power.state = state; | |
510 | } | |
1da177e4 | 511 | |
d550d98d | 512 | return result; |
1da177e4 LT |
513 | } |
514 | ||
1da177e4 LT |
515 | /* -------------------------------------------------------------------------- |
516 | Driver Interface | |
517 | -------------------------------------------------------------------------- */ | |
518 | ||
4be44fcd | 519 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 520 | { |
c35923bc | 521 | int result = 0, state; |
4be44fcd | 522 | acpi_status status = AE_OK; |
1da177e4 | 523 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
524 | union acpi_object acpi_object; |
525 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 526 | |
1da177e4 LT |
527 | |
528 | if (!device) | |
d550d98d | 529 | return -EINVAL; |
1da177e4 | 530 | |
36bcbec7 | 531 | resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); |
1da177e4 | 532 | if (!resource) |
d550d98d | 533 | return -ENOMEM; |
1da177e4 | 534 | |
41598572 | 535 | resource->device = device; |
0a613902 | 536 | mutex_init(&resource->resource_lock); |
1da177e4 LT |
537 | strcpy(resource->name, device->pnp.bus_id); |
538 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
539 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
db89b4f0 | 540 | device->driver_data = resource; |
1da177e4 LT |
541 | |
542 | /* Evalute the object to get the system level and resource order. */ | |
5fbc19ef | 543 | status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer); |
1da177e4 LT |
544 | if (ACPI_FAILURE(status)) { |
545 | result = -ENODEV; | |
546 | goto end; | |
547 | } | |
548 | resource->system_level = acpi_object.power_resource.system_level; | |
549 | resource->order = acpi_object.power_resource.resource_order; | |
550 | ||
a51e145f | 551 | result = acpi_power_get_state(device->handle, &state); |
1da177e4 LT |
552 | if (result) |
553 | goto end; | |
554 | ||
c35923bc | 555 | switch (state) { |
1da177e4 LT |
556 | case ACPI_POWER_RESOURCE_STATE_ON: |
557 | device->power.state = ACPI_STATE_D0; | |
558 | break; | |
559 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
560 | device->power.state = ACPI_STATE_D3; | |
561 | break; | |
562 | default: | |
563 | device->power.state = ACPI_STATE_UNKNOWN; | |
564 | break; | |
565 | } | |
566 | ||
1da177e4 | 567 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 568 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 569 | |
4be44fcd | 570 | end: |
1da177e4 LT |
571 | if (result) |
572 | kfree(resource); | |
4be44fcd | 573 | |
d550d98d | 574 | return result; |
1da177e4 LT |
575 | } |
576 | ||
4be44fcd | 577 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 | 578 | { |
3e384ee6 | 579 | struct acpi_power_resource *resource; |
1da177e4 | 580 | |
3e384ee6 | 581 | if (!device) |
d550d98d | 582 | return -EINVAL; |
1da177e4 | 583 | |
50dd0969 | 584 | resource = acpi_driver_data(device); |
3e384ee6 RW |
585 | if (!resource) |
586 | return -EINVAL; | |
0a613902 | 587 | |
1da177e4 LT |
588 | kfree(resource); |
589 | ||
d550d98d | 590 | return 0; |
1da177e4 LT |
591 | } |
592 | ||
e8363f33 | 593 | static int acpi_power_resume(struct acpi_device *device) |
0a613902 | 594 | { |
c35923bc | 595 | int result = 0, state; |
3e384ee6 | 596 | struct acpi_power_resource *resource; |
0a613902 | 597 | |
3e384ee6 | 598 | if (!device) |
0a613902 KK |
599 | return -EINVAL; |
600 | ||
db89b4f0 | 601 | resource = acpi_driver_data(device); |
3e384ee6 RW |
602 | if (!resource) |
603 | return -EINVAL; | |
604 | ||
605 | mutex_lock(&resource->resource_lock); | |
0a613902 | 606 | |
a51e145f | 607 | result = acpi_power_get_state(device->handle, &state); |
0a613902 | 608 | if (result) |
3e384ee6 | 609 | goto unlock; |
0a613902 | 610 | |
3e384ee6 RW |
611 | if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count) |
612 | result = __acpi_power_on(resource); | |
0a613902 | 613 | |
3e384ee6 | 614 | unlock: |
0a613902 | 615 | mutex_unlock(&resource->resource_lock); |
3e384ee6 RW |
616 | |
617 | return result; | |
0a613902 KK |
618 | } |
619 | ||
44515374 | 620 | int __init acpi_power_init(void) |
1da177e4 | 621 | { |
1da177e4 | 622 | INIT_LIST_HEAD(&acpi_power_resource_list); |
06af7eb0 | 623 | return acpi_bus_register_driver(&acpi_power_driver); |
1da177e4 | 624 | } |