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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> | |
42 | #include <linux/proc_fs.h> | |
43 | #include <linux/seq_file.h> | |
44 | #include <acpi/acpi_bus.h> | |
45 | #include <acpi/acpi_drivers.h> | |
46 | ||
1da177e4 | 47 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 48 | ACPI_MODULE_NAME("power"); |
1da177e4 LT |
49 | #define ACPI_POWER_COMPONENT 0x00800000 |
50 | #define ACPI_POWER_CLASS "power_resource" | |
1da177e4 LT |
51 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
52 | #define ACPI_POWER_FILE_INFO "info" | |
53 | #define ACPI_POWER_FILE_STATUS "state" | |
54 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
55 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
56 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 ZY |
57 | |
58 | #ifdef MODULE_PARAM_PREFIX | |
59 | #undef MODULE_PARAM_PREFIX | |
60 | #endif | |
61 | #define MODULE_PARAM_PREFIX "acpi." | |
62 | int acpi_power_nocheck; | |
63 | module_param_named(power_nocheck, acpi_power_nocheck, bool, 000); | |
64 | ||
4be44fcd LB |
65 | static int acpi_power_add(struct acpi_device *device); |
66 | static int acpi_power_remove(struct acpi_device *device, int type); | |
e8363f33 | 67 | static int acpi_power_resume(struct acpi_device *device); |
1da177e4 LT |
68 | static int acpi_power_open_fs(struct inode *inode, struct file *file); |
69 | ||
1ba90e3a TR |
70 | static struct acpi_device_id power_device_ids[] = { |
71 | {ACPI_POWER_HID, 0}, | |
72 | {"", 0}, | |
73 | }; | |
74 | MODULE_DEVICE_TABLE(acpi, power_device_ids); | |
75 | ||
1da177e4 | 76 | static struct acpi_driver acpi_power_driver = { |
c2b6705b | 77 | .name = "power", |
4be44fcd | 78 | .class = ACPI_POWER_CLASS, |
1ba90e3a | 79 | .ids = power_device_ids, |
4be44fcd LB |
80 | .ops = { |
81 | .add = acpi_power_add, | |
82 | .remove = acpi_power_remove, | |
0a613902 | 83 | .resume = acpi_power_resume, |
4be44fcd | 84 | }, |
1da177e4 LT |
85 | }; |
86 | ||
0a613902 KK |
87 | struct acpi_power_reference { |
88 | struct list_head node; | |
89 | struct acpi_device *device; | |
90 | }; | |
91 | ||
4be44fcd | 92 | struct acpi_power_resource { |
41598572 | 93 | struct acpi_device * device; |
4be44fcd LB |
94 | acpi_bus_id name; |
95 | u32 system_level; | |
96 | u32 order; | |
0a613902 KK |
97 | struct mutex resource_lock; |
98 | struct list_head reference; | |
1da177e4 LT |
99 | }; |
100 | ||
4be44fcd | 101 | static struct list_head acpi_power_resource_list; |
1da177e4 | 102 | |
d7508032 | 103 | static const struct file_operations acpi_power_fops = { |
cf7acfab | 104 | .owner = THIS_MODULE, |
4be44fcd LB |
105 | .open = acpi_power_open_fs, |
106 | .read = seq_read, | |
107 | .llseek = seq_lseek, | |
108 | .release = single_release, | |
1da177e4 LT |
109 | }; |
110 | ||
111 | /* -------------------------------------------------------------------------- | |
112 | Power Resource Management | |
113 | -------------------------------------------------------------------------- */ | |
114 | ||
115 | static int | |
4be44fcd LB |
116 | acpi_power_get_context(acpi_handle handle, |
117 | struct acpi_power_resource **resource) | |
1da177e4 | 118 | { |
4be44fcd LB |
119 | int result = 0; |
120 | struct acpi_device *device = NULL; | |
1da177e4 | 121 | |
1da177e4 LT |
122 | |
123 | if (!resource) | |
d550d98d | 124 | return -ENODEV; |
1da177e4 LT |
125 | |
126 | result = acpi_bus_get_device(handle, &device); | |
127 | if (result) { | |
cece9296 | 128 | printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle); |
d550d98d | 129 | return result; |
1da177e4 LT |
130 | } |
131 | ||
50dd0969 | 132 | *resource = acpi_driver_data(device); |
a815ab8b | 133 | if (!*resource) |
d550d98d | 134 | return -ENODEV; |
1da177e4 | 135 | |
d550d98d | 136 | return 0; |
1da177e4 LT |
137 | } |
138 | ||
a51e145f | 139 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 140 | { |
4be44fcd | 141 | acpi_status status = AE_OK; |
27663c58 | 142 | unsigned long long sta = 0; |
1da177e4 | 143 | |
1da177e4 | 144 | |
a51e145f | 145 | if (!handle || !state) |
d550d98d | 146 | return -EINVAL; |
1da177e4 | 147 | |
a51e145f | 148 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 149 | if (ACPI_FAILURE(status)) |
d550d98d | 150 | return -ENODEV; |
1da177e4 | 151 | |
c35923bc AS |
152 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
153 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 LT |
154 | |
155 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", | |
a51e145f | 156 | acpi_ut_get_node_name(handle), state ? "on" : "off")); |
1da177e4 | 157 | |
d550d98d | 158 | return 0; |
1da177e4 LT |
159 | } |
160 | ||
4be44fcd | 161 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 162 | { |
c35923bc | 163 | int result = 0, state1; |
4be44fcd | 164 | u32 i = 0; |
1da177e4 | 165 | |
1da177e4 LT |
166 | |
167 | if (!list || !state) | |
d550d98d | 168 | return -EINVAL; |
1da177e4 LT |
169 | |
170 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
a51e145f | 171 | /* */ |
1da177e4 | 172 | |
4be44fcd | 173 | for (i = 0; i < list->count; i++) { |
a51e145f ZY |
174 | /* |
175 | * The state of the power resource can be obtained by | |
176 | * using the ACPI handle. In such case it is unnecessary to | |
177 | * get the Power resource first and then get its state again. | |
178 | */ | |
179 | result = acpi_power_get_state(list->handles[i], &state1); | |
1da177e4 | 180 | if (result) |
d550d98d | 181 | return result; |
1da177e4 | 182 | |
c35923bc | 183 | *state = state1; |
1da177e4 LT |
184 | |
185 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
186 | break; | |
187 | } | |
188 | ||
189 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 190 | *state ? "on" : "off")); |
1da177e4 | 191 | |
d550d98d | 192 | return result; |
1da177e4 LT |
193 | } |
194 | ||
0a613902 | 195 | static int acpi_power_on(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 196 | { |
c35923bc | 197 | int result = 0, state; |
0a613902 | 198 | int found = 0; |
4be44fcd | 199 | acpi_status status = AE_OK; |
1da177e4 | 200 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
201 | struct list_head *node, *next; |
202 | struct acpi_power_reference *ref; | |
1da177e4 | 203 | |
1da177e4 LT |
204 | |
205 | result = acpi_power_get_context(handle, &resource); | |
206 | if (result) | |
d550d98d | 207 | return result; |
1da177e4 | 208 | |
0a613902 KK |
209 | mutex_lock(&resource->resource_lock); |
210 | list_for_each_safe(node, next, &resource->reference) { | |
211 | ref = container_of(node, struct acpi_power_reference, node); | |
212 | if (dev->handle == ref->device->handle) { | |
213 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n", | |
214 | dev->pnp.bus_id, resource->name)); | |
215 | found = 1; | |
216 | break; | |
217 | } | |
218 | } | |
219 | ||
220 | if (!found) { | |
221 | ref = kmalloc(sizeof (struct acpi_power_reference), | |
222 | irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL); | |
223 | if (!ref) { | |
224 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n")); | |
225 | mutex_unlock(&resource->resource_lock); | |
226 | return -ENOMEM; | |
227 | } | |
228 | list_add_tail(&ref->node, &resource->reference); | |
229 | ref->device = dev; | |
230 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n", | |
231 | dev->pnp.bus_id, resource->name)); | |
232 | } | |
233 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 234 | |
5fbc19ef | 235 | status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL); |
1da177e4 | 236 | if (ACPI_FAILURE(status)) |
d550d98d | 237 | return -ENODEV; |
1da177e4 | 238 | |
f5adfaa3 ZY |
239 | if (!acpi_power_nocheck) { |
240 | /* | |
241 | * If acpi_power_nocheck is set, it is unnecessary to check | |
242 | * the power state after power transition. | |
243 | */ | |
244 | result = acpi_power_get_state(resource->device->handle, | |
245 | &state); | |
246 | if (result) | |
247 | return result; | |
248 | if (state != ACPI_POWER_RESOURCE_STATE_ON) | |
249 | return -ENOEXEC; | |
250 | } | |
1da177e4 | 251 | /* Update the power resource's _device_ power state */ |
41598572 | 252 | resource->device->power.state = ACPI_STATE_D0; |
1da177e4 LT |
253 | |
254 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 255 | resource->name)); |
d550d98d | 256 | return 0; |
1da177e4 LT |
257 | } |
258 | ||
0a613902 | 259 | static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 260 | { |
c35923bc | 261 | int result = 0, state; |
4be44fcd | 262 | acpi_status status = AE_OK; |
1da177e4 | 263 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
264 | struct list_head *node, *next; |
265 | struct acpi_power_reference *ref; | |
266 | ||
1da177e4 | 267 | |
1da177e4 LT |
268 | result = acpi_power_get_context(handle, &resource); |
269 | if (result) | |
d550d98d | 270 | return result; |
1da177e4 | 271 | |
0a613902 KK |
272 | mutex_lock(&resource->resource_lock); |
273 | list_for_each_safe(node, next, &resource->reference) { | |
274 | ref = container_of(node, struct acpi_power_reference, node); | |
275 | if (dev->handle == ref->device->handle) { | |
276 | list_del(&ref->node); | |
277 | kfree(ref); | |
278 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n", | |
279 | dev->pnp.bus_id, resource->name)); | |
280 | break; | |
281 | } | |
282 | } | |
1da177e4 | 283 | |
0a613902 KK |
284 | if (!list_empty(&resource->reference)) { |
285 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n", | |
286 | resource->name)); | |
287 | mutex_unlock(&resource->resource_lock); | |
d550d98d | 288 | return 0; |
1da177e4 | 289 | } |
0a613902 | 290 | mutex_unlock(&resource->resource_lock); |
1da177e4 | 291 | |
5fbc19ef | 292 | status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL); |
1da177e4 | 293 | if (ACPI_FAILURE(status)) |
d550d98d | 294 | return -ENODEV; |
1da177e4 | 295 | |
f5adfaa3 ZY |
296 | if (!acpi_power_nocheck) { |
297 | /* | |
298 | * If acpi_power_nocheck is set, it is unnecessary to check | |
299 | * the power state after power transition. | |
300 | */ | |
301 | result = acpi_power_get_state(handle, &state); | |
302 | if (result) | |
303 | return result; | |
304 | if (state != ACPI_POWER_RESOURCE_STATE_OFF) | |
305 | return -ENOEXEC; | |
306 | } | |
1da177e4 LT |
307 | |
308 | /* Update the power resource's _device_ power state */ | |
786f18c6 | 309 | resource->device->power.state = ACPI_STATE_D3; |
1da177e4 LT |
310 | |
311 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 312 | resource->name)); |
1da177e4 | 313 | |
d550d98d | 314 | return 0; |
1da177e4 LT |
315 | } |
316 | ||
77e76609 RW |
317 | /** |
318 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
319 | * ACPI 3.0) _PSW (Power State Wake) | |
320 | * @dev: Device to handle. | |
321 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
322 | * @sleep_state: Target sleep state of the system. | |
323 | * @dev_state: Target power state of the device. | |
324 | * | |
325 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
326 | * State Wake) for the device, if present. On failure reset the device's | |
327 | * wakeup.flags.valid flag. | |
328 | * | |
329 | * RETURN VALUE: | |
330 | * 0 if either _DSW or _PSW has been successfully executed | |
331 | * 0 if neither _DSW nor _PSW has been found | |
332 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
333 | */ | |
334 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
335 | int enable, int sleep_state, int dev_state) | |
336 | { | |
337 | union acpi_object in_arg[3]; | |
338 | struct acpi_object_list arg_list = { 3, in_arg }; | |
339 | acpi_status status = AE_OK; | |
340 | ||
341 | /* | |
342 | * Try to execute _DSW first. | |
343 | * | |
344 | * Three agruments are needed for the _DSW object: | |
345 | * Argument 0: enable/disable the wake capabilities | |
346 | * Argument 1: target system state | |
347 | * Argument 2: target device state | |
348 | * When _DSW object is called to disable the wake capabilities, maybe | |
349 | * the first argument is filled. The values of the other two agruments | |
350 | * are meaningless. | |
351 | */ | |
352 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
353 | in_arg[0].integer.value = enable; | |
354 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
355 | in_arg[1].integer.value = sleep_state; | |
356 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
357 | in_arg[2].integer.value = dev_state; | |
358 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
359 | if (ACPI_SUCCESS(status)) { | |
360 | return 0; | |
361 | } else if (status != AE_NOT_FOUND) { | |
362 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
363 | dev->wakeup.flags.valid = 0; | |
364 | return -ENODEV; | |
365 | } | |
366 | ||
367 | /* Execute _PSW */ | |
368 | arg_list.count = 1; | |
369 | in_arg[0].integer.value = enable; | |
370 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
371 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
372 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
373 | dev->wakeup.flags.valid = 0; | |
374 | return -ENODEV; | |
375 | } | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
1da177e4 LT |
380 | /* |
381 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
382 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
383 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
384 | * State Wake) for the device, if present | |
1da177e4 | 385 | */ |
77e76609 | 386 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 387 | { |
0af4b8c4 | 388 | int i, err; |
1da177e4 | 389 | |
1da177e4 | 390 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 391 | return -EINVAL; |
1da177e4 | 392 | |
0af4b8c4 RW |
393 | /* |
394 | * Do not execute the code below twice in a row without calling | |
395 | * acpi_disable_wakeup_device_power() in between for the same device | |
396 | */ | |
397 | if (dev->wakeup.flags.prepared) | |
398 | return 0; | |
399 | ||
1da177e4 LT |
400 | /* Open power resource */ |
401 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
77e76609 | 402 | int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 403 | if (ret) { |
6468463a | 404 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 405 | dev->wakeup.flags.valid = 0; |
77e76609 | 406 | return -ENODEV; |
1da177e4 LT |
407 | } |
408 | } | |
409 | ||
77e76609 RW |
410 | /* |
411 | * Passing 3 as the third argument below means the device may be placed | |
412 | * in arbitrary power state afterwards. | |
413 | */ | |
0af4b8c4 RW |
414 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); |
415 | if (!err) | |
416 | dev->wakeup.flags.prepared = 1; | |
417 | ||
418 | return err; | |
1da177e4 LT |
419 | } |
420 | ||
421 | /* | |
422 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
423 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
424 | * State Wake) for the device, if present | |
1da177e4 LT |
425 | * 2. Shutdown down the power resources |
426 | */ | |
4be44fcd | 427 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 428 | { |
77e76609 | 429 | int i, ret; |
1da177e4 LT |
430 | |
431 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 432 | return -EINVAL; |
1da177e4 | 433 | |
0af4b8c4 RW |
434 | /* |
435 | * Do not execute the code below twice in a row without calling | |
436 | * acpi_enable_wakeup_device_power() in between for the same device | |
437 | */ | |
438 | if (!dev->wakeup.flags.prepared) | |
439 | return 0; | |
440 | ||
441 | dev->wakeup.flags.prepared = 0; | |
442 | ||
77e76609 RW |
443 | ret = acpi_device_sleep_wake(dev, 0, 0, 0); |
444 | if (ret) | |
445 | return ret; | |
1da177e4 LT |
446 | |
447 | /* Close power resource */ | |
448 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
0a613902 | 449 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 450 | if (ret) { |
6468463a | 451 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 452 | dev->wakeup.flags.valid = 0; |
77e76609 | 453 | return -ENODEV; |
1da177e4 LT |
454 | } |
455 | } | |
456 | ||
d550d98d | 457 | return ret; |
1da177e4 LT |
458 | } |
459 | ||
460 | /* -------------------------------------------------------------------------- | |
461 | Device Power Management | |
462 | -------------------------------------------------------------------------- */ | |
463 | ||
4be44fcd | 464 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 465 | { |
4be44fcd LB |
466 | int result = 0; |
467 | struct acpi_handle_list *list = NULL; | |
468 | int list_state = 0; | |
469 | int i = 0; | |
1da177e4 | 470 | |
1da177e4 LT |
471 | |
472 | if (!device) | |
d550d98d | 473 | return -EINVAL; |
1da177e4 LT |
474 | |
475 | device->power.state = ACPI_STATE_UNKNOWN; | |
476 | ||
477 | /* | |
478 | * We know a device's inferred power state when all the resources | |
479 | * required for a given D-state are 'on'. | |
480 | */ | |
4be44fcd | 481 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
482 | list = &device->power.states[i].resources; |
483 | if (list->count < 1) | |
484 | continue; | |
485 | ||
486 | result = acpi_power_get_list_state(list, &list_state); | |
487 | if (result) | |
d550d98d | 488 | return result; |
1da177e4 LT |
489 | |
490 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
491 | device->power.state = i; | |
d550d98d | 492 | return 0; |
1da177e4 LT |
493 | } |
494 | } | |
495 | ||
496 | device->power.state = ACPI_STATE_D3; | |
497 | ||
d550d98d | 498 | return 0; |
1da177e4 LT |
499 | } |
500 | ||
4be44fcd | 501 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 502 | { |
4be44fcd LB |
503 | int result = 0; |
504 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
505 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
506 | int i = 0; | |
1da177e4 | 507 | |
1da177e4 LT |
508 | |
509 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
d550d98d | 510 | return -EINVAL; |
1da177e4 | 511 | |
4be44fcd LB |
512 | if ((device->power.state < ACPI_STATE_D0) |
513 | || (device->power.state > ACPI_STATE_D3)) | |
d550d98d | 514 | return -ENODEV; |
1da177e4 LT |
515 | |
516 | cl = &device->power.states[device->power.state].resources; | |
517 | tl = &device->power.states[state].resources; | |
518 | ||
1da177e4 LT |
519 | if (!cl->count && !tl->count) { |
520 | result = -ENODEV; | |
521 | goto end; | |
522 | } | |
523 | ||
524 | /* TBD: Resources must be ordered. */ | |
525 | ||
526 | /* | |
527 | * First we reference all power resources required in the target list | |
528 | * (e.g. so the device doesn't lose power while transitioning). | |
529 | */ | |
4be44fcd | 530 | for (i = 0; i < tl->count; i++) { |
0a613902 | 531 | result = acpi_power_on(tl->handles[i], device); |
1da177e4 LT |
532 | if (result) |
533 | goto end; | |
534 | } | |
535 | ||
b1028c54 KK |
536 | if (device->power.state == state) { |
537 | goto end; | |
538 | } | |
539 | ||
1da177e4 LT |
540 | /* |
541 | * Then we dereference all power resources used in the current list. | |
542 | */ | |
4be44fcd | 543 | for (i = 0; i < cl->count; i++) { |
0a613902 | 544 | result = acpi_power_off_device(cl->handles[i], device); |
1da177e4 LT |
545 | if (result) |
546 | goto end; | |
547 | } | |
548 | ||
72925760 | 549 | end: |
e76d5f7e | 550 | if (result) |
72925760 | 551 | device->power.state = ACPI_STATE_UNKNOWN; |
e76d5f7e | 552 | else { |
72925760 KK |
553 | /* We shouldn't change the state till all above operations succeed */ |
554 | device->power.state = state; | |
555 | } | |
1da177e4 | 556 | |
d550d98d | 557 | return result; |
1da177e4 LT |
558 | } |
559 | ||
1da177e4 LT |
560 | /* -------------------------------------------------------------------------- |
561 | FS Interface (/proc) | |
562 | -------------------------------------------------------------------------- */ | |
563 | ||
4be44fcd | 564 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
565 | |
566 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
567 | { | |
0a613902 | 568 | int count = 0; |
c35923bc | 569 | int result = 0, state; |
1da177e4 | 570 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
571 | struct list_head *node, *next; |
572 | struct acpi_power_reference *ref; | |
1da177e4 | 573 | |
1da177e4 | 574 | |
50dd0969 | 575 | resource = seq->private; |
1da177e4 LT |
576 | |
577 | if (!resource) | |
578 | goto end; | |
579 | ||
a51e145f | 580 | result = acpi_power_get_state(resource->device->handle, &state); |
0a613902 KK |
581 | if (result) |
582 | goto end; | |
583 | ||
1da177e4 | 584 | seq_puts(seq, "state: "); |
c35923bc | 585 | switch (state) { |
1da177e4 LT |
586 | case ACPI_POWER_RESOURCE_STATE_ON: |
587 | seq_puts(seq, "on\n"); | |
588 | break; | |
589 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
590 | seq_puts(seq, "off\n"); | |
591 | break; | |
592 | default: | |
593 | seq_puts(seq, "unknown\n"); | |
594 | break; | |
595 | } | |
596 | ||
0a613902 KK |
597 | mutex_lock(&resource->resource_lock); |
598 | list_for_each_safe(node, next, &resource->reference) { | |
599 | ref = container_of(node, struct acpi_power_reference, node); | |
600 | count++; | |
601 | } | |
602 | mutex_unlock(&resource->resource_lock); | |
603 | ||
1da177e4 | 604 | seq_printf(seq, "system level: S%d\n" |
4be44fcd LB |
605 | "order: %d\n" |
606 | "reference count: %d\n", | |
607 | resource->system_level, | |
0a613902 | 608 | resource->order, count); |
1da177e4 | 609 | |
4be44fcd | 610 | end: |
d550d98d | 611 | return 0; |
1da177e4 LT |
612 | } |
613 | ||
614 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
615 | { | |
616 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
617 | } | |
618 | ||
4be44fcd | 619 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 620 | { |
4be44fcd | 621 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 622 | |
1da177e4 LT |
623 | |
624 | if (!device) | |
d550d98d | 625 | return -EINVAL; |
1da177e4 LT |
626 | |
627 | if (!acpi_device_dir(device)) { | |
628 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 629 | acpi_power_dir); |
1da177e4 | 630 | if (!acpi_device_dir(device)) |
d550d98d | 631 | return -ENODEV; |
1da177e4 LT |
632 | } |
633 | ||
634 | /* 'status' [R] */ | |
cf7acfab DL |
635 | entry = proc_create_data(ACPI_POWER_FILE_STATUS, |
636 | S_IRUGO, acpi_device_dir(device), | |
637 | &acpi_power_fops, acpi_driver_data(device)); | |
1da177e4 | 638 | if (!entry) |
d550d98d | 639 | return -EIO; |
d550d98d | 640 | return 0; |
1da177e4 LT |
641 | } |
642 | ||
4be44fcd | 643 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 | 644 | { |
1da177e4 LT |
645 | |
646 | if (acpi_device_dir(device)) { | |
647 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
648 | acpi_device_dir(device)); | |
649 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
650 | acpi_device_dir(device) = NULL; | |
651 | } | |
652 | ||
d550d98d | 653 | return 0; |
1da177e4 LT |
654 | } |
655 | ||
1da177e4 LT |
656 | /* -------------------------------------------------------------------------- |
657 | Driver Interface | |
658 | -------------------------------------------------------------------------- */ | |
659 | ||
4be44fcd | 660 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 661 | { |
c35923bc | 662 | int result = 0, state; |
4be44fcd | 663 | acpi_status status = AE_OK; |
1da177e4 | 664 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
665 | union acpi_object acpi_object; |
666 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 667 | |
1da177e4 LT |
668 | |
669 | if (!device) | |
d550d98d | 670 | return -EINVAL; |
1da177e4 | 671 | |
36bcbec7 | 672 | resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); |
1da177e4 | 673 | if (!resource) |
d550d98d | 674 | return -ENOMEM; |
1da177e4 | 675 | |
41598572 | 676 | resource->device = device; |
0a613902 KK |
677 | mutex_init(&resource->resource_lock); |
678 | INIT_LIST_HEAD(&resource->reference); | |
1da177e4 LT |
679 | strcpy(resource->name, device->pnp.bus_id); |
680 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
681 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
db89b4f0 | 682 | device->driver_data = resource; |
1da177e4 LT |
683 | |
684 | /* Evalute the object to get the system level and resource order. */ | |
5fbc19ef | 685 | status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer); |
1da177e4 LT |
686 | if (ACPI_FAILURE(status)) { |
687 | result = -ENODEV; | |
688 | goto end; | |
689 | } | |
690 | resource->system_level = acpi_object.power_resource.system_level; | |
691 | resource->order = acpi_object.power_resource.resource_order; | |
692 | ||
a51e145f | 693 | result = acpi_power_get_state(device->handle, &state); |
1da177e4 LT |
694 | if (result) |
695 | goto end; | |
696 | ||
c35923bc | 697 | switch (state) { |
1da177e4 LT |
698 | case ACPI_POWER_RESOURCE_STATE_ON: |
699 | device->power.state = ACPI_STATE_D0; | |
700 | break; | |
701 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
702 | device->power.state = ACPI_STATE_D3; | |
703 | break; | |
704 | default: | |
705 | device->power.state = ACPI_STATE_UNKNOWN; | |
706 | break; | |
707 | } | |
708 | ||
709 | result = acpi_power_add_fs(device); | |
710 | if (result) | |
711 | goto end; | |
4be44fcd | 712 | |
1da177e4 | 713 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 714 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 715 | |
4be44fcd | 716 | end: |
1da177e4 LT |
717 | if (result) |
718 | kfree(resource); | |
4be44fcd | 719 | |
d550d98d | 720 | return result; |
1da177e4 LT |
721 | } |
722 | ||
4be44fcd | 723 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
724 | { |
725 | struct acpi_power_resource *resource = NULL; | |
0a613902 | 726 | struct list_head *node, *next; |
1da177e4 | 727 | |
1da177e4 LT |
728 | |
729 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 730 | return -EINVAL; |
1da177e4 | 731 | |
50dd0969 | 732 | resource = acpi_driver_data(device); |
1da177e4 LT |
733 | |
734 | acpi_power_remove_fs(device); | |
735 | ||
0a613902 KK |
736 | mutex_lock(&resource->resource_lock); |
737 | list_for_each_safe(node, next, &resource->reference) { | |
738 | struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node); | |
739 | list_del(&ref->node); | |
740 | kfree(ref); | |
741 | } | |
742 | mutex_unlock(&resource->resource_lock); | |
743 | ||
1da177e4 LT |
744 | kfree(resource); |
745 | ||
d550d98d | 746 | return 0; |
1da177e4 LT |
747 | } |
748 | ||
e8363f33 | 749 | static int acpi_power_resume(struct acpi_device *device) |
0a613902 | 750 | { |
c35923bc | 751 | int result = 0, state; |
0a613902 KK |
752 | struct acpi_power_resource *resource = NULL; |
753 | struct acpi_power_reference *ref; | |
754 | ||
755 | if (!device || !acpi_driver_data(device)) | |
756 | return -EINVAL; | |
757 | ||
db89b4f0 | 758 | resource = acpi_driver_data(device); |
0a613902 | 759 | |
a51e145f | 760 | result = acpi_power_get_state(device->handle, &state); |
0a613902 KK |
761 | if (result) |
762 | return result; | |
763 | ||
764 | mutex_lock(&resource->resource_lock); | |
c35923bc | 765 | if (state == ACPI_POWER_RESOURCE_STATE_OFF && |
0a613902 KK |
766 | !list_empty(&resource->reference)) { |
767 | ref = container_of(resource->reference.next, struct acpi_power_reference, node); | |
768 | mutex_unlock(&resource->resource_lock); | |
769 | result = acpi_power_on(device->handle, ref->device); | |
770 | return result; | |
771 | } | |
772 | ||
773 | mutex_unlock(&resource->resource_lock); | |
774 | return 0; | |
775 | } | |
776 | ||
4be44fcd | 777 | static int __init acpi_power_init(void) |
1da177e4 | 778 | { |
4be44fcd | 779 | int result = 0; |
1da177e4 | 780 | |
1da177e4 LT |
781 | |
782 | if (acpi_disabled) | |
d550d98d | 783 | return 0; |
1da177e4 LT |
784 | |
785 | INIT_LIST_HEAD(&acpi_power_resource_list); | |
786 | ||
787 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
788 | if (!acpi_power_dir) | |
d550d98d | 789 | return -ENODEV; |
1da177e4 LT |
790 | |
791 | result = acpi_bus_register_driver(&acpi_power_driver); | |
792 | if (result < 0) { | |
793 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
d550d98d | 794 | return -ENODEV; |
1da177e4 LT |
795 | } |
796 | ||
d550d98d | 797 | return 0; |
1da177e4 LT |
798 | } |
799 | ||
800 | subsys_initcall(acpi_power_init); |