]>
Commit | Line | Data |
---|---|---|
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 | ||
89595b8f | 47 | #define _COMPONENT ACPI_POWER_COMPONENT |
f52fd66d | 48 | ACPI_MODULE_NAME("power"); |
1da177e4 | 49 | #define ACPI_POWER_CLASS "power_resource" |
1da177e4 LT |
50 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
51 | #define ACPI_POWER_FILE_INFO "info" | |
52 | #define ACPI_POWER_FILE_STATUS "state" | |
53 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
54 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
55 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
f5adfaa3 ZY |
56 | |
57 | #ifdef MODULE_PARAM_PREFIX | |
58 | #undef MODULE_PARAM_PREFIX | |
59 | #endif | |
60 | #define MODULE_PARAM_PREFIX "acpi." | |
61 | int acpi_power_nocheck; | |
62 | module_param_named(power_nocheck, acpi_power_nocheck, bool, 000); | |
63 | ||
4be44fcd LB |
64 | static int acpi_power_add(struct acpi_device *device); |
65 | static int acpi_power_remove(struct acpi_device *device, int type); | |
e8363f33 | 66 | static int acpi_power_resume(struct acpi_device *device); |
1da177e4 LT |
67 | static int acpi_power_open_fs(struct inode *inode, struct file *file); |
68 | ||
1ba90e3a TR |
69 | static struct acpi_device_id power_device_ids[] = { |
70 | {ACPI_POWER_HID, 0}, | |
71 | {"", 0}, | |
72 | }; | |
73 | MODULE_DEVICE_TABLE(acpi, power_device_ids); | |
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, | |
0a613902 | 82 | .resume = acpi_power_resume, |
4be44fcd | 83 | }, |
1da177e4 LT |
84 | }; |
85 | ||
0a613902 KK |
86 | struct acpi_power_reference { |
87 | struct list_head node; | |
88 | struct acpi_device *device; | |
89 | }; | |
90 | ||
4be44fcd | 91 | struct acpi_power_resource { |
41598572 | 92 | struct acpi_device * device; |
4be44fcd LB |
93 | acpi_bus_id name; |
94 | u32 system_level; | |
95 | u32 order; | |
0a613902 KK |
96 | struct mutex resource_lock; |
97 | struct list_head reference; | |
1da177e4 LT |
98 | }; |
99 | ||
4be44fcd | 100 | static struct list_head acpi_power_resource_list; |
1da177e4 | 101 | |
d7508032 | 102 | static const struct file_operations acpi_power_fops = { |
cf7acfab | 103 | .owner = THIS_MODULE, |
4be44fcd LB |
104 | .open = acpi_power_open_fs, |
105 | .read = seq_read, | |
106 | .llseek = seq_lseek, | |
107 | .release = single_release, | |
1da177e4 LT |
108 | }; |
109 | ||
110 | /* -------------------------------------------------------------------------- | |
111 | Power Resource Management | |
112 | -------------------------------------------------------------------------- */ | |
113 | ||
114 | static int | |
4be44fcd LB |
115 | acpi_power_get_context(acpi_handle handle, |
116 | struct acpi_power_resource **resource) | |
1da177e4 | 117 | { |
4be44fcd LB |
118 | int result = 0; |
119 | struct acpi_device *device = NULL; | |
1da177e4 | 120 | |
1da177e4 LT |
121 | |
122 | if (!resource) | |
d550d98d | 123 | return -ENODEV; |
1da177e4 LT |
124 | |
125 | result = acpi_bus_get_device(handle, &device); | |
126 | if (result) { | |
cece9296 | 127 | printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle); |
d550d98d | 128 | return result; |
1da177e4 LT |
129 | } |
130 | ||
50dd0969 | 131 | *resource = acpi_driver_data(device); |
a815ab8b | 132 | if (!*resource) |
d550d98d | 133 | return -ENODEV; |
1da177e4 | 134 | |
d550d98d | 135 | return 0; |
1da177e4 LT |
136 | } |
137 | ||
a51e145f | 138 | static int acpi_power_get_state(acpi_handle handle, int *state) |
1da177e4 | 139 | { |
4be44fcd | 140 | acpi_status status = AE_OK; |
27663c58 | 141 | unsigned long long sta = 0; |
60a4ce7f LM |
142 | char node_name[5]; |
143 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
1da177e4 | 144 | |
1da177e4 | 145 | |
a51e145f | 146 | if (!handle || !state) |
d550d98d | 147 | return -EINVAL; |
1da177e4 | 148 | |
a51e145f | 149 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
1da177e4 | 150 | if (ACPI_FAILURE(status)) |
d550d98d | 151 | return -ENODEV; |
1da177e4 | 152 | |
c35923bc AS |
153 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
154 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 | 155 | |
60a4ce7f LM |
156 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
157 | ||
1da177e4 | 158 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", |
60a4ce7f | 159 | node_name, |
b1b57fbe | 160 | *state ? "on" : "off")); |
1da177e4 | 161 | |
d550d98d | 162 | return 0; |
1da177e4 LT |
163 | } |
164 | ||
4be44fcd | 165 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 166 | { |
c35923bc | 167 | int result = 0, state1; |
4be44fcd | 168 | u32 i = 0; |
1da177e4 | 169 | |
1da177e4 LT |
170 | |
171 | if (!list || !state) | |
d550d98d | 172 | return -EINVAL; |
1da177e4 LT |
173 | |
174 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
a51e145f | 175 | /* */ |
1da177e4 | 176 | |
4be44fcd | 177 | for (i = 0; i < list->count; i++) { |
a51e145f ZY |
178 | /* |
179 | * The state of the power resource can be obtained by | |
180 | * using the ACPI handle. In such case it is unnecessary to | |
181 | * get the Power resource first and then get its state again. | |
182 | */ | |
183 | result = acpi_power_get_state(list->handles[i], &state1); | |
1da177e4 | 184 | if (result) |
d550d98d | 185 | return result; |
1da177e4 | 186 | |
c35923bc | 187 | *state = state1; |
1da177e4 LT |
188 | |
189 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
190 | break; | |
191 | } | |
192 | ||
193 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 194 | *state ? "on" : "off")); |
1da177e4 | 195 | |
d550d98d | 196 | return result; |
1da177e4 LT |
197 | } |
198 | ||
0a613902 | 199 | static int acpi_power_on(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 200 | { |
c35923bc | 201 | int result = 0, state; |
0a613902 | 202 | int found = 0; |
4be44fcd | 203 | acpi_status status = AE_OK; |
1da177e4 | 204 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
205 | struct list_head *node, *next; |
206 | struct acpi_power_reference *ref; | |
1da177e4 | 207 | |
1da177e4 LT |
208 | |
209 | result = acpi_power_get_context(handle, &resource); | |
210 | if (result) | |
d550d98d | 211 | return result; |
1da177e4 | 212 | |
0a613902 KK |
213 | mutex_lock(&resource->resource_lock); |
214 | list_for_each_safe(node, next, &resource->reference) { | |
215 | ref = container_of(node, struct acpi_power_reference, node); | |
216 | if (dev->handle == ref->device->handle) { | |
217 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n", | |
218 | dev->pnp.bus_id, resource->name)); | |
219 | found = 1; | |
220 | break; | |
221 | } | |
222 | } | |
223 | ||
224 | if (!found) { | |
225 | ref = kmalloc(sizeof (struct acpi_power_reference), | |
226 | irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL); | |
227 | if (!ref) { | |
228 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n")); | |
229 | mutex_unlock(&resource->resource_lock); | |
230 | return -ENOMEM; | |
231 | } | |
232 | list_add_tail(&ref->node, &resource->reference); | |
233 | ref->device = dev; | |
234 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n", | |
235 | dev->pnp.bus_id, resource->name)); | |
236 | } | |
237 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 238 | |
5fbc19ef | 239 | status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL); |
1da177e4 | 240 | if (ACPI_FAILURE(status)) |
d550d98d | 241 | return -ENODEV; |
1da177e4 | 242 | |
f5adfaa3 ZY |
243 | if (!acpi_power_nocheck) { |
244 | /* | |
245 | * If acpi_power_nocheck is set, it is unnecessary to check | |
246 | * the power state after power transition. | |
247 | */ | |
248 | result = acpi_power_get_state(resource->device->handle, | |
249 | &state); | |
250 | if (result) | |
251 | return result; | |
252 | if (state != ACPI_POWER_RESOURCE_STATE_ON) | |
253 | return -ENOEXEC; | |
254 | } | |
1da177e4 | 255 | /* Update the power resource's _device_ power state */ |
41598572 | 256 | resource->device->power.state = ACPI_STATE_D0; |
1da177e4 LT |
257 | |
258 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 259 | resource->name)); |
d550d98d | 260 | return 0; |
1da177e4 LT |
261 | } |
262 | ||
0a613902 | 263 | static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 264 | { |
c35923bc | 265 | int result = 0, state; |
4be44fcd | 266 | acpi_status status = AE_OK; |
1da177e4 | 267 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
268 | struct list_head *node, *next; |
269 | struct acpi_power_reference *ref; | |
270 | ||
1da177e4 | 271 | |
1da177e4 LT |
272 | result = acpi_power_get_context(handle, &resource); |
273 | if (result) | |
d550d98d | 274 | return result; |
1da177e4 | 275 | |
0a613902 KK |
276 | mutex_lock(&resource->resource_lock); |
277 | list_for_each_safe(node, next, &resource->reference) { | |
278 | ref = container_of(node, struct acpi_power_reference, node); | |
279 | if (dev->handle == ref->device->handle) { | |
280 | list_del(&ref->node); | |
281 | kfree(ref); | |
282 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n", | |
283 | dev->pnp.bus_id, resource->name)); | |
284 | break; | |
285 | } | |
286 | } | |
1da177e4 | 287 | |
0a613902 KK |
288 | if (!list_empty(&resource->reference)) { |
289 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n", | |
290 | resource->name)); | |
291 | mutex_unlock(&resource->resource_lock); | |
d550d98d | 292 | return 0; |
1da177e4 | 293 | } |
0a613902 | 294 | mutex_unlock(&resource->resource_lock); |
1da177e4 | 295 | |
5fbc19ef | 296 | status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL); |
1da177e4 | 297 | if (ACPI_FAILURE(status)) |
d550d98d | 298 | return -ENODEV; |
1da177e4 | 299 | |
f5adfaa3 ZY |
300 | if (!acpi_power_nocheck) { |
301 | /* | |
302 | * If acpi_power_nocheck is set, it is unnecessary to check | |
303 | * the power state after power transition. | |
304 | */ | |
305 | result = acpi_power_get_state(handle, &state); | |
306 | if (result) | |
307 | return result; | |
308 | if (state != ACPI_POWER_RESOURCE_STATE_OFF) | |
309 | return -ENOEXEC; | |
310 | } | |
1da177e4 LT |
311 | |
312 | /* Update the power resource's _device_ power state */ | |
786f18c6 | 313 | resource->device->power.state = ACPI_STATE_D3; |
1da177e4 LT |
314 | |
315 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 316 | resource->name)); |
1da177e4 | 317 | |
d550d98d | 318 | return 0; |
1da177e4 LT |
319 | } |
320 | ||
77e76609 RW |
321 | /** |
322 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
323 | * ACPI 3.0) _PSW (Power State Wake) | |
324 | * @dev: Device to handle. | |
325 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
326 | * @sleep_state: Target sleep state of the system. | |
327 | * @dev_state: Target power state of the device. | |
328 | * | |
329 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
330 | * State Wake) for the device, if present. On failure reset the device's | |
331 | * wakeup.flags.valid flag. | |
332 | * | |
333 | * RETURN VALUE: | |
334 | * 0 if either _DSW or _PSW has been successfully executed | |
335 | * 0 if neither _DSW nor _PSW has been found | |
336 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
337 | */ | |
338 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
339 | int enable, int sleep_state, int dev_state) | |
340 | { | |
341 | union acpi_object in_arg[3]; | |
342 | struct acpi_object_list arg_list = { 3, in_arg }; | |
343 | acpi_status status = AE_OK; | |
344 | ||
345 | /* | |
346 | * Try to execute _DSW first. | |
347 | * | |
348 | * Three agruments are needed for the _DSW object: | |
349 | * Argument 0: enable/disable the wake capabilities | |
350 | * Argument 1: target system state | |
351 | * Argument 2: target device state | |
352 | * When _DSW object is called to disable the wake capabilities, maybe | |
353 | * the first argument is filled. The values of the other two agruments | |
354 | * are meaningless. | |
355 | */ | |
356 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
357 | in_arg[0].integer.value = enable; | |
358 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
359 | in_arg[1].integer.value = sleep_state; | |
360 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
361 | in_arg[2].integer.value = dev_state; | |
362 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
363 | if (ACPI_SUCCESS(status)) { | |
364 | return 0; | |
365 | } else if (status != AE_NOT_FOUND) { | |
366 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
367 | dev->wakeup.flags.valid = 0; | |
368 | return -ENODEV; | |
369 | } | |
370 | ||
371 | /* Execute _PSW */ | |
372 | arg_list.count = 1; | |
373 | in_arg[0].integer.value = enable; | |
374 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
375 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
376 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
377 | dev->wakeup.flags.valid = 0; | |
378 | return -ENODEV; | |
379 | } | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
1da177e4 LT |
384 | /* |
385 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
386 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
387 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
388 | * State Wake) for the device, if present | |
1da177e4 | 389 | */ |
77e76609 | 390 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 391 | { |
0af4b8c4 | 392 | int i, err; |
1da177e4 | 393 | |
1da177e4 | 394 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 395 | return -EINVAL; |
1da177e4 | 396 | |
0af4b8c4 RW |
397 | /* |
398 | * Do not execute the code below twice in a row without calling | |
399 | * acpi_disable_wakeup_device_power() in between for the same device | |
400 | */ | |
401 | if (dev->wakeup.flags.prepared) | |
402 | return 0; | |
403 | ||
1da177e4 LT |
404 | /* Open power resource */ |
405 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
77e76609 | 406 | int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 407 | if (ret) { |
6468463a | 408 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 409 | dev->wakeup.flags.valid = 0; |
77e76609 | 410 | return -ENODEV; |
1da177e4 LT |
411 | } |
412 | } | |
413 | ||
77e76609 RW |
414 | /* |
415 | * Passing 3 as the third argument below means the device may be placed | |
416 | * in arbitrary power state afterwards. | |
417 | */ | |
0af4b8c4 RW |
418 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); |
419 | if (!err) | |
420 | dev->wakeup.flags.prepared = 1; | |
421 | ||
422 | return err; | |
1da177e4 LT |
423 | } |
424 | ||
425 | /* | |
426 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
427 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
428 | * State Wake) for the device, if present | |
1da177e4 LT |
429 | * 2. Shutdown down the power resources |
430 | */ | |
4be44fcd | 431 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 432 | { |
77e76609 | 433 | int i, ret; |
1da177e4 LT |
434 | |
435 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 436 | return -EINVAL; |
1da177e4 | 437 | |
0af4b8c4 RW |
438 | /* |
439 | * Do not execute the code below twice in a row without calling | |
440 | * acpi_enable_wakeup_device_power() in between for the same device | |
441 | */ | |
442 | if (!dev->wakeup.flags.prepared) | |
443 | return 0; | |
444 | ||
445 | dev->wakeup.flags.prepared = 0; | |
446 | ||
77e76609 RW |
447 | ret = acpi_device_sleep_wake(dev, 0, 0, 0); |
448 | if (ret) | |
449 | return ret; | |
1da177e4 LT |
450 | |
451 | /* Close power resource */ | |
452 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
0a613902 | 453 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 454 | if (ret) { |
6468463a | 455 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 456 | dev->wakeup.flags.valid = 0; |
77e76609 | 457 | return -ENODEV; |
1da177e4 LT |
458 | } |
459 | } | |
460 | ||
d550d98d | 461 | return ret; |
1da177e4 LT |
462 | } |
463 | ||
464 | /* -------------------------------------------------------------------------- | |
465 | Device Power Management | |
466 | -------------------------------------------------------------------------- */ | |
467 | ||
4be44fcd | 468 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 469 | { |
4be44fcd LB |
470 | int result = 0; |
471 | struct acpi_handle_list *list = NULL; | |
472 | int list_state = 0; | |
473 | int i = 0; | |
1da177e4 | 474 | |
1da177e4 LT |
475 | |
476 | if (!device) | |
d550d98d | 477 | return -EINVAL; |
1da177e4 LT |
478 | |
479 | device->power.state = ACPI_STATE_UNKNOWN; | |
480 | ||
481 | /* | |
482 | * We know a device's inferred power state when all the resources | |
483 | * required for a given D-state are 'on'. | |
484 | */ | |
4be44fcd | 485 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
486 | list = &device->power.states[i].resources; |
487 | if (list->count < 1) | |
488 | continue; | |
489 | ||
490 | result = acpi_power_get_list_state(list, &list_state); | |
491 | if (result) | |
d550d98d | 492 | return result; |
1da177e4 LT |
493 | |
494 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
495 | device->power.state = i; | |
d550d98d | 496 | return 0; |
1da177e4 LT |
497 | } |
498 | } | |
499 | ||
500 | device->power.state = ACPI_STATE_D3; | |
501 | ||
d550d98d | 502 | return 0; |
1da177e4 LT |
503 | } |
504 | ||
4be44fcd | 505 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 506 | { |
4be44fcd LB |
507 | int result = 0; |
508 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
509 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
510 | int i = 0; | |
1da177e4 | 511 | |
1da177e4 LT |
512 | |
513 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
d550d98d | 514 | return -EINVAL; |
1da177e4 | 515 | |
4be44fcd LB |
516 | if ((device->power.state < ACPI_STATE_D0) |
517 | || (device->power.state > ACPI_STATE_D3)) | |
d550d98d | 518 | return -ENODEV; |
1da177e4 LT |
519 | |
520 | cl = &device->power.states[device->power.state].resources; | |
521 | tl = &device->power.states[state].resources; | |
522 | ||
1da177e4 LT |
523 | /* TBD: Resources must be ordered. */ |
524 | ||
525 | /* | |
526 | * First we reference all power resources required in the target list | |
527 | * (e.g. so the device doesn't lose power while transitioning). | |
528 | */ | |
4be44fcd | 529 | for (i = 0; i < tl->count; i++) { |
0a613902 | 530 | result = acpi_power_on(tl->handles[i], device); |
1da177e4 LT |
531 | if (result) |
532 | goto end; | |
533 | } | |
534 | ||
b1028c54 KK |
535 | if (device->power.state == state) { |
536 | goto end; | |
537 | } | |
538 | ||
1da177e4 LT |
539 | /* |
540 | * Then we dereference all power resources used in the current list. | |
541 | */ | |
4be44fcd | 542 | for (i = 0; i < cl->count; i++) { |
0a613902 | 543 | result = acpi_power_off_device(cl->handles[i], device); |
1da177e4 LT |
544 | if (result) |
545 | goto end; | |
546 | } | |
547 | ||
72925760 | 548 | end: |
e76d5f7e | 549 | if (result) |
72925760 | 550 | device->power.state = ACPI_STATE_UNKNOWN; |
e76d5f7e | 551 | else { |
72925760 KK |
552 | /* We shouldn't change the state till all above operations succeed */ |
553 | device->power.state = state; | |
554 | } | |
1da177e4 | 555 | |
d550d98d | 556 | return result; |
1da177e4 LT |
557 | } |
558 | ||
1da177e4 LT |
559 | /* -------------------------------------------------------------------------- |
560 | FS Interface (/proc) | |
561 | -------------------------------------------------------------------------- */ | |
562 | ||
4be44fcd | 563 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
564 | |
565 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
566 | { | |
0a613902 | 567 | int count = 0; |
c35923bc | 568 | int result = 0, state; |
1da177e4 | 569 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
570 | struct list_head *node, *next; |
571 | struct acpi_power_reference *ref; | |
1da177e4 | 572 | |
1da177e4 | 573 | |
50dd0969 | 574 | resource = seq->private; |
1da177e4 LT |
575 | |
576 | if (!resource) | |
577 | goto end; | |
578 | ||
a51e145f | 579 | result = acpi_power_get_state(resource->device->handle, &state); |
0a613902 KK |
580 | if (result) |
581 | goto end; | |
582 | ||
1da177e4 | 583 | seq_puts(seq, "state: "); |
c35923bc | 584 | switch (state) { |
1da177e4 LT |
585 | case ACPI_POWER_RESOURCE_STATE_ON: |
586 | seq_puts(seq, "on\n"); | |
587 | break; | |
588 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
589 | seq_puts(seq, "off\n"); | |
590 | break; | |
591 | default: | |
592 | seq_puts(seq, "unknown\n"); | |
593 | break; | |
594 | } | |
595 | ||
0a613902 KK |
596 | mutex_lock(&resource->resource_lock); |
597 | list_for_each_safe(node, next, &resource->reference) { | |
598 | ref = container_of(node, struct acpi_power_reference, node); | |
599 | count++; | |
600 | } | |
601 | mutex_unlock(&resource->resource_lock); | |
602 | ||
1da177e4 | 603 | seq_printf(seq, "system level: S%d\n" |
4be44fcd LB |
604 | "order: %d\n" |
605 | "reference count: %d\n", | |
606 | resource->system_level, | |
0a613902 | 607 | resource->order, count); |
1da177e4 | 608 | |
4be44fcd | 609 | end: |
d550d98d | 610 | return 0; |
1da177e4 LT |
611 | } |
612 | ||
613 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
614 | { | |
615 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
616 | } | |
617 | ||
4be44fcd | 618 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 619 | { |
4be44fcd | 620 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 621 | |
1da177e4 LT |
622 | |
623 | if (!device) | |
d550d98d | 624 | return -EINVAL; |
1da177e4 LT |
625 | |
626 | if (!acpi_device_dir(device)) { | |
627 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 628 | acpi_power_dir); |
1da177e4 | 629 | if (!acpi_device_dir(device)) |
d550d98d | 630 | return -ENODEV; |
1da177e4 LT |
631 | } |
632 | ||
633 | /* 'status' [R] */ | |
cf7acfab DL |
634 | entry = proc_create_data(ACPI_POWER_FILE_STATUS, |
635 | S_IRUGO, acpi_device_dir(device), | |
636 | &acpi_power_fops, acpi_driver_data(device)); | |
1da177e4 | 637 | if (!entry) |
d550d98d | 638 | return -EIO; |
d550d98d | 639 | return 0; |
1da177e4 LT |
640 | } |
641 | ||
4be44fcd | 642 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 | 643 | { |
1da177e4 LT |
644 | |
645 | if (acpi_device_dir(device)) { | |
646 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
647 | acpi_device_dir(device)); | |
648 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
649 | acpi_device_dir(device) = NULL; | |
650 | } | |
651 | ||
d550d98d | 652 | return 0; |
1da177e4 LT |
653 | } |
654 | ||
1da177e4 LT |
655 | /* -------------------------------------------------------------------------- |
656 | Driver Interface | |
657 | -------------------------------------------------------------------------- */ | |
658 | ||
4be44fcd | 659 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 660 | { |
c35923bc | 661 | int result = 0, state; |
4be44fcd | 662 | acpi_status status = AE_OK; |
1da177e4 | 663 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
664 | union acpi_object acpi_object; |
665 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 666 | |
1da177e4 LT |
667 | |
668 | if (!device) | |
d550d98d | 669 | return -EINVAL; |
1da177e4 | 670 | |
36bcbec7 | 671 | resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); |
1da177e4 | 672 | if (!resource) |
d550d98d | 673 | return -ENOMEM; |
1da177e4 | 674 | |
41598572 | 675 | resource->device = device; |
0a613902 KK |
676 | mutex_init(&resource->resource_lock); |
677 | INIT_LIST_HEAD(&resource->reference); | |
1da177e4 LT |
678 | strcpy(resource->name, device->pnp.bus_id); |
679 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
680 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
db89b4f0 | 681 | device->driver_data = resource; |
1da177e4 LT |
682 | |
683 | /* Evalute the object to get the system level and resource order. */ | |
5fbc19ef | 684 | status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer); |
1da177e4 LT |
685 | if (ACPI_FAILURE(status)) { |
686 | result = -ENODEV; | |
687 | goto end; | |
688 | } | |
689 | resource->system_level = acpi_object.power_resource.system_level; | |
690 | resource->order = acpi_object.power_resource.resource_order; | |
691 | ||
a51e145f | 692 | result = acpi_power_get_state(device->handle, &state); |
1da177e4 LT |
693 | if (result) |
694 | goto end; | |
695 | ||
c35923bc | 696 | switch (state) { |
1da177e4 LT |
697 | case ACPI_POWER_RESOURCE_STATE_ON: |
698 | device->power.state = ACPI_STATE_D0; | |
699 | break; | |
700 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
701 | device->power.state = ACPI_STATE_D3; | |
702 | break; | |
703 | default: | |
704 | device->power.state = ACPI_STATE_UNKNOWN; | |
705 | break; | |
706 | } | |
707 | ||
708 | result = acpi_power_add_fs(device); | |
709 | if (result) | |
710 | goto end; | |
4be44fcd | 711 | |
1da177e4 | 712 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 713 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 714 | |
4be44fcd | 715 | end: |
1da177e4 LT |
716 | if (result) |
717 | kfree(resource); | |
4be44fcd | 718 | |
d550d98d | 719 | return result; |
1da177e4 LT |
720 | } |
721 | ||
4be44fcd | 722 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
723 | { |
724 | struct acpi_power_resource *resource = NULL; | |
0a613902 | 725 | struct list_head *node, *next; |
1da177e4 | 726 | |
1da177e4 LT |
727 | |
728 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 729 | return -EINVAL; |
1da177e4 | 730 | |
50dd0969 | 731 | resource = acpi_driver_data(device); |
1da177e4 LT |
732 | |
733 | acpi_power_remove_fs(device); | |
734 | ||
0a613902 KK |
735 | mutex_lock(&resource->resource_lock); |
736 | list_for_each_safe(node, next, &resource->reference) { | |
737 | struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node); | |
738 | list_del(&ref->node); | |
739 | kfree(ref); | |
740 | } | |
741 | mutex_unlock(&resource->resource_lock); | |
742 | ||
1da177e4 LT |
743 | kfree(resource); |
744 | ||
d550d98d | 745 | return 0; |
1da177e4 LT |
746 | } |
747 | ||
e8363f33 | 748 | static int acpi_power_resume(struct acpi_device *device) |
0a613902 | 749 | { |
c35923bc | 750 | int result = 0, state; |
0a613902 KK |
751 | struct acpi_power_resource *resource = NULL; |
752 | struct acpi_power_reference *ref; | |
753 | ||
754 | if (!device || !acpi_driver_data(device)) | |
755 | return -EINVAL; | |
756 | ||
db89b4f0 | 757 | resource = acpi_driver_data(device); |
0a613902 | 758 | |
a51e145f | 759 | result = acpi_power_get_state(device->handle, &state); |
0a613902 KK |
760 | if (result) |
761 | return result; | |
762 | ||
763 | mutex_lock(&resource->resource_lock); | |
c35923bc | 764 | if (state == ACPI_POWER_RESOURCE_STATE_OFF && |
0a613902 KK |
765 | !list_empty(&resource->reference)) { |
766 | ref = container_of(resource->reference.next, struct acpi_power_reference, node); | |
767 | mutex_unlock(&resource->resource_lock); | |
768 | result = acpi_power_on(device->handle, ref->device); | |
769 | return result; | |
770 | } | |
771 | ||
772 | mutex_unlock(&resource->resource_lock); | |
773 | return 0; | |
774 | } | |
775 | ||
4be44fcd | 776 | static int __init acpi_power_init(void) |
1da177e4 | 777 | { |
4be44fcd | 778 | int result = 0; |
1da177e4 | 779 | |
1da177e4 LT |
780 | |
781 | if (acpi_disabled) | |
d550d98d | 782 | return 0; |
1da177e4 LT |
783 | |
784 | INIT_LIST_HEAD(&acpi_power_resource_list); | |
785 | ||
786 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
787 | if (!acpi_power_dir) | |
d550d98d | 788 | return -ENODEV; |
1da177e4 LT |
789 | |
790 | result = acpi_bus_register_driver(&acpi_power_driver); | |
791 | if (result < 0) { | |
792 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
d550d98d | 793 | return -ENODEV; |
1da177e4 LT |
794 | } |
795 | ||
d550d98d | 796 | return 0; |
1da177e4 LT |
797 | } |
798 | ||
799 | subsys_initcall(acpi_power_init); |