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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 <linux/proc_fs.h> |
44 | #include <linux/seq_file.h> | |
45 | #include <acpi/acpi_bus.h> | |
46 | #include <acpi/acpi_drivers.h> | |
9b83ccd2 RW |
47 | #include "sleep.h" |
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 | |
f5adfaa3 ZY |
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 | ||
c97adf9e | 69 | static const struct acpi_device_id power_device_ids[] = { |
1ba90e3a TR |
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'. */ | |
175 | ||
4be44fcd | 176 | for (i = 0; i < list->count; i++) { |
a51e145f ZY |
177 | /* |
178 | * The state of the power resource can be obtained by | |
179 | * using the ACPI handle. In such case it is unnecessary to | |
180 | * get the Power resource first and then get its state again. | |
181 | */ | |
182 | result = acpi_power_get_state(list->handles[i], &state1); | |
1da177e4 | 183 | if (result) |
d550d98d | 184 | return result; |
1da177e4 | 185 | |
c35923bc | 186 | *state = state1; |
1da177e4 LT |
187 | |
188 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
189 | break; | |
190 | } | |
191 | ||
192 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 193 | *state ? "on" : "off")); |
1da177e4 | 194 | |
d550d98d | 195 | return result; |
1da177e4 LT |
196 | } |
197 | ||
0a613902 | 198 | static int acpi_power_on(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 199 | { |
bdf43bbf | 200 | int result = 0; |
0a613902 | 201 | int found = 0; |
4be44fcd | 202 | acpi_status status = AE_OK; |
1da177e4 | 203 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
204 | struct list_head *node, *next; |
205 | struct acpi_power_reference *ref; | |
1da177e4 | 206 | |
1da177e4 LT |
207 | |
208 | result = acpi_power_get_context(handle, &resource); | |
209 | if (result) | |
d550d98d | 210 | return result; |
1da177e4 | 211 | |
0a613902 KK |
212 | mutex_lock(&resource->resource_lock); |
213 | list_for_each_safe(node, next, &resource->reference) { | |
214 | ref = container_of(node, struct acpi_power_reference, node); | |
215 | if (dev->handle == ref->device->handle) { | |
216 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n", | |
217 | dev->pnp.bus_id, resource->name)); | |
218 | found = 1; | |
219 | break; | |
220 | } | |
221 | } | |
222 | ||
223 | if (!found) { | |
224 | ref = kmalloc(sizeof (struct acpi_power_reference), | |
225 | irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL); | |
226 | if (!ref) { | |
227 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n")); | |
228 | mutex_unlock(&resource->resource_lock); | |
229 | return -ENOMEM; | |
230 | } | |
231 | list_add_tail(&ref->node, &resource->reference); | |
232 | ref->device = dev; | |
233 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n", | |
234 | dev->pnp.bus_id, resource->name)); | |
235 | } | |
236 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 237 | |
5fbc19ef | 238 | status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL); |
1da177e4 | 239 | if (ACPI_FAILURE(status)) |
d550d98d | 240 | return -ENODEV; |
1da177e4 | 241 | |
1da177e4 | 242 | /* Update the power resource's _device_ power state */ |
41598572 | 243 | resource->device->power.state = ACPI_STATE_D0; |
1da177e4 LT |
244 | |
245 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 246 | resource->name)); |
d550d98d | 247 | return 0; |
1da177e4 LT |
248 | } |
249 | ||
0a613902 | 250 | static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 251 | { |
bdf43bbf | 252 | int result = 0; |
4be44fcd | 253 | acpi_status status = AE_OK; |
1da177e4 | 254 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
255 | struct list_head *node, *next; |
256 | struct acpi_power_reference *ref; | |
257 | ||
1da177e4 | 258 | |
1da177e4 LT |
259 | result = acpi_power_get_context(handle, &resource); |
260 | if (result) | |
d550d98d | 261 | return result; |
1da177e4 | 262 | |
0a613902 KK |
263 | mutex_lock(&resource->resource_lock); |
264 | list_for_each_safe(node, next, &resource->reference) { | |
265 | ref = container_of(node, struct acpi_power_reference, node); | |
266 | if (dev->handle == ref->device->handle) { | |
267 | list_del(&ref->node); | |
268 | kfree(ref); | |
269 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n", | |
270 | dev->pnp.bus_id, resource->name)); | |
271 | break; | |
272 | } | |
273 | } | |
1da177e4 | 274 | |
0a613902 KK |
275 | if (!list_empty(&resource->reference)) { |
276 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n", | |
277 | resource->name)); | |
278 | mutex_unlock(&resource->resource_lock); | |
d550d98d | 279 | return 0; |
1da177e4 | 280 | } |
0a613902 | 281 | mutex_unlock(&resource->resource_lock); |
1da177e4 | 282 | |
5fbc19ef | 283 | status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL); |
1da177e4 | 284 | if (ACPI_FAILURE(status)) |
d550d98d | 285 | return -ENODEV; |
1da177e4 | 286 | |
1da177e4 | 287 | /* Update the power resource's _device_ power state */ |
786f18c6 | 288 | resource->device->power.state = ACPI_STATE_D3; |
1da177e4 LT |
289 | |
290 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 291 | resource->name)); |
1da177e4 | 292 | |
d550d98d | 293 | return 0; |
1da177e4 LT |
294 | } |
295 | ||
77e76609 RW |
296 | /** |
297 | * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in | |
298 | * ACPI 3.0) _PSW (Power State Wake) | |
299 | * @dev: Device to handle. | |
300 | * @enable: 0 - disable, 1 - enable the wake capabilities of the device. | |
301 | * @sleep_state: Target sleep state of the system. | |
302 | * @dev_state: Target power state of the device. | |
303 | * | |
304 | * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power | |
305 | * State Wake) for the device, if present. On failure reset the device's | |
306 | * wakeup.flags.valid flag. | |
307 | * | |
308 | * RETURN VALUE: | |
309 | * 0 if either _DSW or _PSW has been successfully executed | |
310 | * 0 if neither _DSW nor _PSW has been found | |
311 | * -ENODEV if the execution of either _DSW or _PSW has failed | |
312 | */ | |
313 | int acpi_device_sleep_wake(struct acpi_device *dev, | |
314 | int enable, int sleep_state, int dev_state) | |
315 | { | |
316 | union acpi_object in_arg[3]; | |
317 | struct acpi_object_list arg_list = { 3, in_arg }; | |
318 | acpi_status status = AE_OK; | |
319 | ||
320 | /* | |
321 | * Try to execute _DSW first. | |
322 | * | |
323 | * Three agruments are needed for the _DSW object: | |
324 | * Argument 0: enable/disable the wake capabilities | |
325 | * Argument 1: target system state | |
326 | * Argument 2: target device state | |
327 | * When _DSW object is called to disable the wake capabilities, maybe | |
328 | * the first argument is filled. The values of the other two agruments | |
329 | * are meaningless. | |
330 | */ | |
331 | in_arg[0].type = ACPI_TYPE_INTEGER; | |
332 | in_arg[0].integer.value = enable; | |
333 | in_arg[1].type = ACPI_TYPE_INTEGER; | |
334 | in_arg[1].integer.value = sleep_state; | |
335 | in_arg[2].type = ACPI_TYPE_INTEGER; | |
336 | in_arg[2].integer.value = dev_state; | |
337 | status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL); | |
338 | if (ACPI_SUCCESS(status)) { | |
339 | return 0; | |
340 | } else if (status != AE_NOT_FOUND) { | |
341 | printk(KERN_ERR PREFIX "_DSW execution failed\n"); | |
342 | dev->wakeup.flags.valid = 0; | |
343 | return -ENODEV; | |
344 | } | |
345 | ||
346 | /* Execute _PSW */ | |
347 | arg_list.count = 1; | |
348 | in_arg[0].integer.value = enable; | |
349 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
350 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
351 | printk(KERN_ERR PREFIX "_PSW execution failed\n"); | |
352 | dev->wakeup.flags.valid = 0; | |
353 | return -ENODEV; | |
354 | } | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
1da177e4 LT |
359 | /* |
360 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
361 | * 1. Power on the power resources required for the wakeup device | |
77e76609 RW |
362 | * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
363 | * State Wake) for the device, if present | |
1da177e4 | 364 | */ |
77e76609 | 365 | int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state) |
1da177e4 | 366 | { |
9b83ccd2 | 367 | int i, err = 0; |
1da177e4 | 368 | |
1da177e4 | 369 | if (!dev || !dev->wakeup.flags.valid) |
77e76609 | 370 | return -EINVAL; |
1da177e4 | 371 | |
9b83ccd2 RW |
372 | mutex_lock(&acpi_device_lock); |
373 | ||
374 | if (dev->wakeup.prepare_count++) | |
375 | goto out; | |
0af4b8c4 | 376 | |
1da177e4 LT |
377 | /* Open power resource */ |
378 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
77e76609 | 379 | int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 380 | if (ret) { |
6468463a | 381 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 382 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
383 | err = -ENODEV; |
384 | goto err_out; | |
1da177e4 LT |
385 | } |
386 | } | |
387 | ||
77e76609 RW |
388 | /* |
389 | * Passing 3 as the third argument below means the device may be placed | |
390 | * in arbitrary power state afterwards. | |
391 | */ | |
0af4b8c4 | 392 | err = acpi_device_sleep_wake(dev, 1, sleep_state, 3); |
0af4b8c4 | 393 | |
9b83ccd2 RW |
394 | err_out: |
395 | if (err) | |
396 | dev->wakeup.prepare_count = 0; | |
397 | ||
398 | out: | |
399 | mutex_unlock(&acpi_device_lock); | |
0af4b8c4 | 400 | return err; |
1da177e4 LT |
401 | } |
402 | ||
403 | /* | |
404 | * Shutdown a wakeup device, counterpart of above method | |
77e76609 RW |
405 | * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power |
406 | * State Wake) for the device, if present | |
1da177e4 LT |
407 | * 2. Shutdown down the power resources |
408 | */ | |
4be44fcd | 409 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 410 | { |
9b83ccd2 | 411 | int i, err = 0; |
1da177e4 LT |
412 | |
413 | if (!dev || !dev->wakeup.flags.valid) | |
77e76609 | 414 | return -EINVAL; |
1da177e4 | 415 | |
9b83ccd2 RW |
416 | mutex_lock(&acpi_device_lock); |
417 | ||
418 | if (--dev->wakeup.prepare_count > 0) | |
419 | goto out; | |
420 | ||
0af4b8c4 | 421 | /* |
9b83ccd2 RW |
422 | * Executing the code below even if prepare_count is already zero when |
423 | * the function is called may be useful, for example for initialisation. | |
0af4b8c4 | 424 | */ |
9b83ccd2 RW |
425 | if (dev->wakeup.prepare_count < 0) |
426 | dev->wakeup.prepare_count = 0; | |
0af4b8c4 | 427 | |
9b83ccd2 RW |
428 | err = acpi_device_sleep_wake(dev, 0, 0, 0); |
429 | if (err) | |
430 | goto out; | |
1da177e4 LT |
431 | |
432 | /* Close power resource */ | |
433 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
9b83ccd2 RW |
434 | int ret = acpi_power_off_device( |
435 | dev->wakeup.resources.handles[i], dev); | |
1da177e4 | 436 | if (ret) { |
6468463a | 437 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 438 | dev->wakeup.flags.valid = 0; |
9b83ccd2 RW |
439 | err = -ENODEV; |
440 | goto out; | |
1da177e4 LT |
441 | } |
442 | } | |
443 | ||
9b83ccd2 RW |
444 | out: |
445 | mutex_unlock(&acpi_device_lock); | |
446 | return err; | |
1da177e4 LT |
447 | } |
448 | ||
449 | /* -------------------------------------------------------------------------- | |
450 | Device Power Management | |
451 | -------------------------------------------------------------------------- */ | |
452 | ||
4be44fcd | 453 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 454 | { |
4be44fcd LB |
455 | int result = 0; |
456 | struct acpi_handle_list *list = NULL; | |
457 | int list_state = 0; | |
458 | int i = 0; | |
1da177e4 | 459 | |
1da177e4 LT |
460 | |
461 | if (!device) | |
d550d98d | 462 | return -EINVAL; |
1da177e4 LT |
463 | |
464 | device->power.state = ACPI_STATE_UNKNOWN; | |
465 | ||
466 | /* | |
467 | * We know a device's inferred power state when all the resources | |
468 | * required for a given D-state are 'on'. | |
469 | */ | |
4be44fcd | 470 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
471 | list = &device->power.states[i].resources; |
472 | if (list->count < 1) | |
473 | continue; | |
474 | ||
475 | result = acpi_power_get_list_state(list, &list_state); | |
476 | if (result) | |
d550d98d | 477 | return result; |
1da177e4 LT |
478 | |
479 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
480 | device->power.state = i; | |
d550d98d | 481 | return 0; |
1da177e4 LT |
482 | } |
483 | } | |
484 | ||
485 | device->power.state = ACPI_STATE_D3; | |
486 | ||
d550d98d | 487 | return 0; |
1da177e4 LT |
488 | } |
489 | ||
4be44fcd | 490 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 491 | { |
4be44fcd LB |
492 | int result = 0; |
493 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
494 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
495 | int i = 0; | |
1da177e4 | 496 | |
1da177e4 LT |
497 | |
498 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
d550d98d | 499 | return -EINVAL; |
1da177e4 | 500 | |
4be44fcd LB |
501 | if ((device->power.state < ACPI_STATE_D0) |
502 | || (device->power.state > ACPI_STATE_D3)) | |
d550d98d | 503 | return -ENODEV; |
1da177e4 LT |
504 | |
505 | cl = &device->power.states[device->power.state].resources; | |
506 | tl = &device->power.states[state].resources; | |
507 | ||
1da177e4 LT |
508 | /* TBD: Resources must be ordered. */ |
509 | ||
510 | /* | |
511 | * First we reference all power resources required in the target list | |
512 | * (e.g. so the device doesn't lose power while transitioning). | |
513 | */ | |
4be44fcd | 514 | for (i = 0; i < tl->count; i++) { |
0a613902 | 515 | result = acpi_power_on(tl->handles[i], device); |
1da177e4 LT |
516 | if (result) |
517 | goto end; | |
518 | } | |
519 | ||
b1028c54 KK |
520 | if (device->power.state == state) { |
521 | goto end; | |
522 | } | |
523 | ||
1da177e4 LT |
524 | /* |
525 | * Then we dereference all power resources used in the current list. | |
526 | */ | |
4be44fcd | 527 | for (i = 0; i < cl->count; i++) { |
0a613902 | 528 | result = acpi_power_off_device(cl->handles[i], device); |
1da177e4 LT |
529 | if (result) |
530 | goto end; | |
531 | } | |
532 | ||
72925760 | 533 | end: |
e76d5f7e | 534 | if (result) |
72925760 | 535 | device->power.state = ACPI_STATE_UNKNOWN; |
e76d5f7e | 536 | else { |
72925760 KK |
537 | /* We shouldn't change the state till all above operations succeed */ |
538 | device->power.state = state; | |
539 | } | |
1da177e4 | 540 | |
d550d98d | 541 | return result; |
1da177e4 LT |
542 | } |
543 | ||
1da177e4 LT |
544 | /* -------------------------------------------------------------------------- |
545 | FS Interface (/proc) | |
546 | -------------------------------------------------------------------------- */ | |
547 | ||
4be44fcd | 548 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
549 | |
550 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
551 | { | |
0a613902 | 552 | int count = 0; |
c35923bc | 553 | int result = 0, state; |
1da177e4 | 554 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
555 | struct list_head *node, *next; |
556 | struct acpi_power_reference *ref; | |
1da177e4 | 557 | |
1da177e4 | 558 | |
50dd0969 | 559 | resource = seq->private; |
1da177e4 LT |
560 | |
561 | if (!resource) | |
562 | goto end; | |
563 | ||
a51e145f | 564 | result = acpi_power_get_state(resource->device->handle, &state); |
0a613902 KK |
565 | if (result) |
566 | goto end; | |
567 | ||
1da177e4 | 568 | seq_puts(seq, "state: "); |
c35923bc | 569 | switch (state) { |
1da177e4 LT |
570 | case ACPI_POWER_RESOURCE_STATE_ON: |
571 | seq_puts(seq, "on\n"); | |
572 | break; | |
573 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
574 | seq_puts(seq, "off\n"); | |
575 | break; | |
576 | default: | |
577 | seq_puts(seq, "unknown\n"); | |
578 | break; | |
579 | } | |
580 | ||
0a613902 KK |
581 | mutex_lock(&resource->resource_lock); |
582 | list_for_each_safe(node, next, &resource->reference) { | |
583 | ref = container_of(node, struct acpi_power_reference, node); | |
584 | count++; | |
585 | } | |
586 | mutex_unlock(&resource->resource_lock); | |
587 | ||
1da177e4 | 588 | seq_printf(seq, "system level: S%d\n" |
4be44fcd LB |
589 | "order: %d\n" |
590 | "reference count: %d\n", | |
591 | resource->system_level, | |
0a613902 | 592 | resource->order, count); |
1da177e4 | 593 | |
4be44fcd | 594 | end: |
d550d98d | 595 | return 0; |
1da177e4 LT |
596 | } |
597 | ||
598 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
599 | { | |
600 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
601 | } | |
602 | ||
4be44fcd | 603 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 604 | { |
4be44fcd | 605 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 606 | |
1da177e4 LT |
607 | |
608 | if (!device) | |
d550d98d | 609 | return -EINVAL; |
1da177e4 LT |
610 | |
611 | if (!acpi_device_dir(device)) { | |
612 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 613 | acpi_power_dir); |
1da177e4 | 614 | if (!acpi_device_dir(device)) |
d550d98d | 615 | return -ENODEV; |
1da177e4 LT |
616 | } |
617 | ||
618 | /* 'status' [R] */ | |
cf7acfab DL |
619 | entry = proc_create_data(ACPI_POWER_FILE_STATUS, |
620 | S_IRUGO, acpi_device_dir(device), | |
621 | &acpi_power_fops, acpi_driver_data(device)); | |
1da177e4 | 622 | if (!entry) |
d550d98d | 623 | return -EIO; |
d550d98d | 624 | return 0; |
1da177e4 LT |
625 | } |
626 | ||
4be44fcd | 627 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 | 628 | { |
1da177e4 LT |
629 | |
630 | if (acpi_device_dir(device)) { | |
631 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
632 | acpi_device_dir(device)); | |
633 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
634 | acpi_device_dir(device) = NULL; | |
635 | } | |
636 | ||
d550d98d | 637 | return 0; |
1da177e4 LT |
638 | } |
639 | ||
1da177e4 LT |
640 | /* -------------------------------------------------------------------------- |
641 | Driver Interface | |
642 | -------------------------------------------------------------------------- */ | |
643 | ||
4be44fcd | 644 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 645 | { |
c35923bc | 646 | int result = 0, state; |
4be44fcd | 647 | acpi_status status = AE_OK; |
1da177e4 | 648 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
649 | union acpi_object acpi_object; |
650 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 651 | |
1da177e4 LT |
652 | |
653 | if (!device) | |
d550d98d | 654 | return -EINVAL; |
1da177e4 | 655 | |
36bcbec7 | 656 | resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); |
1da177e4 | 657 | if (!resource) |
d550d98d | 658 | return -ENOMEM; |
1da177e4 | 659 | |
41598572 | 660 | resource->device = device; |
0a613902 KK |
661 | mutex_init(&resource->resource_lock); |
662 | INIT_LIST_HEAD(&resource->reference); | |
1da177e4 LT |
663 | strcpy(resource->name, device->pnp.bus_id); |
664 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
665 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
db89b4f0 | 666 | device->driver_data = resource; |
1da177e4 LT |
667 | |
668 | /* Evalute the object to get the system level and resource order. */ | |
5fbc19ef | 669 | status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer); |
1da177e4 LT |
670 | if (ACPI_FAILURE(status)) { |
671 | result = -ENODEV; | |
672 | goto end; | |
673 | } | |
674 | resource->system_level = acpi_object.power_resource.system_level; | |
675 | resource->order = acpi_object.power_resource.resource_order; | |
676 | ||
a51e145f | 677 | result = acpi_power_get_state(device->handle, &state); |
1da177e4 LT |
678 | if (result) |
679 | goto end; | |
680 | ||
c35923bc | 681 | switch (state) { |
1da177e4 LT |
682 | case ACPI_POWER_RESOURCE_STATE_ON: |
683 | device->power.state = ACPI_STATE_D0; | |
684 | break; | |
685 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
686 | device->power.state = ACPI_STATE_D3; | |
687 | break; | |
688 | default: | |
689 | device->power.state = ACPI_STATE_UNKNOWN; | |
690 | break; | |
691 | } | |
692 | ||
693 | result = acpi_power_add_fs(device); | |
694 | if (result) | |
695 | goto end; | |
4be44fcd | 696 | |
1da177e4 | 697 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 698 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 699 | |
4be44fcd | 700 | end: |
1da177e4 LT |
701 | if (result) |
702 | kfree(resource); | |
4be44fcd | 703 | |
d550d98d | 704 | return result; |
1da177e4 LT |
705 | } |
706 | ||
4be44fcd | 707 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
708 | { |
709 | struct acpi_power_resource *resource = NULL; | |
0a613902 | 710 | struct list_head *node, *next; |
1da177e4 | 711 | |
1da177e4 LT |
712 | |
713 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 714 | return -EINVAL; |
1da177e4 | 715 | |
50dd0969 | 716 | resource = acpi_driver_data(device); |
1da177e4 LT |
717 | |
718 | acpi_power_remove_fs(device); | |
719 | ||
0a613902 KK |
720 | mutex_lock(&resource->resource_lock); |
721 | list_for_each_safe(node, next, &resource->reference) { | |
722 | struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node); | |
723 | list_del(&ref->node); | |
724 | kfree(ref); | |
725 | } | |
726 | mutex_unlock(&resource->resource_lock); | |
727 | ||
1da177e4 LT |
728 | kfree(resource); |
729 | ||
d550d98d | 730 | return 0; |
1da177e4 LT |
731 | } |
732 | ||
e8363f33 | 733 | static int acpi_power_resume(struct acpi_device *device) |
0a613902 | 734 | { |
c35923bc | 735 | int result = 0, state; |
0a613902 KK |
736 | struct acpi_power_resource *resource = NULL; |
737 | struct acpi_power_reference *ref; | |
738 | ||
739 | if (!device || !acpi_driver_data(device)) | |
740 | return -EINVAL; | |
741 | ||
db89b4f0 | 742 | resource = acpi_driver_data(device); |
0a613902 | 743 | |
a51e145f | 744 | result = acpi_power_get_state(device->handle, &state); |
0a613902 KK |
745 | if (result) |
746 | return result; | |
747 | ||
748 | mutex_lock(&resource->resource_lock); | |
c35923bc | 749 | if (state == ACPI_POWER_RESOURCE_STATE_OFF && |
0a613902 KK |
750 | !list_empty(&resource->reference)) { |
751 | ref = container_of(resource->reference.next, struct acpi_power_reference, node); | |
752 | mutex_unlock(&resource->resource_lock); | |
753 | result = acpi_power_on(device->handle, ref->device); | |
754 | return result; | |
755 | } | |
756 | ||
757 | mutex_unlock(&resource->resource_lock); | |
758 | return 0; | |
759 | } | |
760 | ||
44515374 | 761 | int __init acpi_power_init(void) |
1da177e4 | 762 | { |
4be44fcd | 763 | int result = 0; |
1da177e4 | 764 | |
1da177e4 LT |
765 | INIT_LIST_HEAD(&acpi_power_resource_list); |
766 | ||
767 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
768 | if (!acpi_power_dir) | |
d550d98d | 769 | return -ENODEV; |
1da177e4 LT |
770 | |
771 | result = acpi_bus_register_driver(&acpi_power_driver); | |
772 | if (result < 0) { | |
773 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
d550d98d | 774 | return -ENODEV; |
1da177e4 LT |
775 | } |
776 | ||
d550d98d | 777 | return 0; |
1da177e4 | 778 | } |