]>
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 | ||
1da177e4 | 47 | #define _COMPONENT ACPI_POWER_COMPONENT |
4be44fcd | 48 | ACPI_MODULE_NAME("acpi_power") |
1da177e4 LT |
49 | #define ACPI_POWER_COMPONENT 0x00800000 |
50 | #define ACPI_POWER_CLASS "power_resource" | |
51 | #define ACPI_POWER_DRIVER_NAME "ACPI Power Resource Driver" | |
52 | #define ACPI_POWER_DEVICE_NAME "Power Resource" | |
53 | #define ACPI_POWER_FILE_INFO "info" | |
54 | #define ACPI_POWER_FILE_STATUS "state" | |
55 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
56 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
57 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
4be44fcd LB |
58 | static int acpi_power_add(struct acpi_device *device); |
59 | static int acpi_power_remove(struct acpi_device *device, int type); | |
1da177e4 LT |
60 | static int acpi_power_open_fs(struct inode *inode, struct file *file); |
61 | ||
62 | static struct acpi_driver acpi_power_driver = { | |
4be44fcd LB |
63 | .name = ACPI_POWER_DRIVER_NAME, |
64 | .class = ACPI_POWER_CLASS, | |
65 | .ids = ACPI_POWER_HID, | |
66 | .ops = { | |
67 | .add = acpi_power_add, | |
68 | .remove = acpi_power_remove, | |
69 | }, | |
1da177e4 LT |
70 | }; |
71 | ||
4be44fcd LB |
72 | struct acpi_power_resource { |
73 | acpi_handle handle; | |
74 | acpi_bus_id name; | |
75 | u32 system_level; | |
76 | u32 order; | |
77 | int state; | |
78 | int references; | |
1da177e4 LT |
79 | }; |
80 | ||
4be44fcd | 81 | static struct list_head acpi_power_resource_list; |
1da177e4 LT |
82 | |
83 | static struct file_operations acpi_power_fops = { | |
4be44fcd LB |
84 | .open = acpi_power_open_fs, |
85 | .read = seq_read, | |
86 | .llseek = seq_lseek, | |
87 | .release = single_release, | |
1da177e4 LT |
88 | }; |
89 | ||
90 | /* -------------------------------------------------------------------------- | |
91 | Power Resource Management | |
92 | -------------------------------------------------------------------------- */ | |
93 | ||
94 | static int | |
4be44fcd LB |
95 | acpi_power_get_context(acpi_handle handle, |
96 | struct acpi_power_resource **resource) | |
1da177e4 | 97 | { |
4be44fcd LB |
98 | int result = 0; |
99 | struct acpi_device *device = NULL; | |
1da177e4 LT |
100 | |
101 | ACPI_FUNCTION_TRACE("acpi_power_get_context"); | |
102 | ||
103 | if (!resource) | |
104 | return_VALUE(-ENODEV); | |
105 | ||
106 | result = acpi_bus_get_device(handle, &device); | |
107 | if (result) { | |
108 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error getting context [%p]\n", | |
4be44fcd | 109 | handle)); |
1da177e4 LT |
110 | return_VALUE(result); |
111 | } | |
112 | ||
4be44fcd | 113 | *resource = (struct acpi_power_resource *)acpi_driver_data(device); |
1da177e4 LT |
114 | if (!resource) |
115 | return_VALUE(-ENODEV); | |
116 | ||
117 | return_VALUE(0); | |
118 | } | |
119 | ||
4be44fcd | 120 | static int acpi_power_get_state(struct acpi_power_resource *resource) |
1da177e4 | 121 | { |
4be44fcd LB |
122 | acpi_status status = AE_OK; |
123 | unsigned long sta = 0; | |
1da177e4 LT |
124 | |
125 | ACPI_FUNCTION_TRACE("acpi_power_get_state"); | |
126 | ||
127 | if (!resource) | |
128 | return_VALUE(-EINVAL); | |
129 | ||
130 | status = acpi_evaluate_integer(resource->handle, "_STA", NULL, &sta); | |
131 | if (ACPI_FAILURE(status)) | |
132 | return_VALUE(-ENODEV); | |
133 | ||
134 | if (sta & 0x01) | |
135 | resource->state = ACPI_POWER_RESOURCE_STATE_ON; | |
136 | else | |
137 | resource->state = ACPI_POWER_RESOURCE_STATE_OFF; | |
138 | ||
139 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", | |
4be44fcd | 140 | resource->name, resource->state ? "on" : "off")); |
1da177e4 LT |
141 | |
142 | return_VALUE(0); | |
143 | } | |
144 | ||
4be44fcd | 145 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 146 | { |
4be44fcd | 147 | int result = 0; |
1da177e4 | 148 | struct acpi_power_resource *resource = NULL; |
4be44fcd | 149 | u32 i = 0; |
1da177e4 LT |
150 | |
151 | ACPI_FUNCTION_TRACE("acpi_power_get_list_state"); | |
152 | ||
153 | if (!list || !state) | |
154 | return_VALUE(-EINVAL); | |
155 | ||
156 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
157 | ||
4be44fcd | 158 | for (i = 0; i < list->count; i++) { |
1da177e4 LT |
159 | result = acpi_power_get_context(list->handles[i], &resource); |
160 | if (result) | |
161 | return_VALUE(result); | |
162 | result = acpi_power_get_state(resource); | |
163 | if (result) | |
164 | return_VALUE(result); | |
165 | ||
166 | *state = resource->state; | |
167 | ||
168 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
169 | break; | |
170 | } | |
171 | ||
172 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 173 | *state ? "on" : "off")); |
1da177e4 LT |
174 | |
175 | return_VALUE(result); | |
176 | } | |
177 | ||
4be44fcd | 178 | static int acpi_power_on(acpi_handle handle) |
1da177e4 | 179 | { |
4be44fcd LB |
180 | int result = 0; |
181 | acpi_status status = AE_OK; | |
182 | struct acpi_device *device = NULL; | |
1da177e4 LT |
183 | struct acpi_power_resource *resource = NULL; |
184 | ||
185 | ACPI_FUNCTION_TRACE("acpi_power_on"); | |
186 | ||
187 | result = acpi_power_get_context(handle, &resource); | |
188 | if (result) | |
189 | return_VALUE(result); | |
190 | ||
191 | resource->references++; | |
192 | ||
4be44fcd LB |
193 | if ((resource->references > 1) |
194 | || (resource->state == ACPI_POWER_RESOURCE_STATE_ON)) { | |
1da177e4 | 195 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n", |
4be44fcd | 196 | resource->name)); |
1da177e4 LT |
197 | return_VALUE(0); |
198 | } | |
199 | ||
200 | status = acpi_evaluate_object(resource->handle, "_ON", NULL, NULL); | |
201 | if (ACPI_FAILURE(status)) | |
202 | return_VALUE(-ENODEV); | |
203 | ||
204 | result = acpi_power_get_state(resource); | |
205 | if (result) | |
206 | return_VALUE(result); | |
207 | if (resource->state != ACPI_POWER_RESOURCE_STATE_ON) | |
208 | return_VALUE(-ENOEXEC); | |
209 | ||
210 | /* Update the power resource's _device_ power state */ | |
211 | result = acpi_bus_get_device(resource->handle, &device); | |
212 | if (result) | |
213 | return_VALUE(result); | |
214 | device->power.state = ACPI_STATE_D0; | |
215 | ||
216 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 217 | resource->name)); |
1da177e4 LT |
218 | |
219 | return_VALUE(0); | |
220 | } | |
221 | ||
4be44fcd | 222 | static int acpi_power_off_device(acpi_handle handle) |
1da177e4 | 223 | { |
4be44fcd LB |
224 | int result = 0; |
225 | acpi_status status = AE_OK; | |
226 | struct acpi_device *device = NULL; | |
1da177e4 LT |
227 | struct acpi_power_resource *resource = NULL; |
228 | ||
229 | ACPI_FUNCTION_TRACE("acpi_power_off_device"); | |
230 | ||
231 | result = acpi_power_get_context(handle, &resource); | |
232 | if (result) | |
233 | return_VALUE(result); | |
234 | ||
235 | if (resource->references) | |
236 | resource->references--; | |
237 | ||
238 | if (resource->references) { | |
4be44fcd LB |
239 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
240 | "Resource [%s] is still in use, dereferencing\n", | |
241 | device->pnp.bus_id)); | |
1da177e4 LT |
242 | return_VALUE(0); |
243 | } | |
244 | ||
245 | if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) { | |
246 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n", | |
4be44fcd | 247 | device->pnp.bus_id)); |
1da177e4 LT |
248 | return_VALUE(0); |
249 | } | |
250 | ||
251 | status = acpi_evaluate_object(resource->handle, "_OFF", NULL, NULL); | |
252 | if (ACPI_FAILURE(status)) | |
253 | return_VALUE(-ENODEV); | |
254 | ||
255 | result = acpi_power_get_state(resource); | |
256 | if (result) | |
257 | return_VALUE(result); | |
258 | if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF) | |
259 | return_VALUE(-ENOEXEC); | |
260 | ||
261 | /* Update the power resource's _device_ power state */ | |
262 | result = acpi_bus_get_device(resource->handle, &device); | |
263 | if (result) | |
264 | return_VALUE(result); | |
265 | device->power.state = ACPI_STATE_D3; | |
266 | ||
267 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 268 | resource->name)); |
1da177e4 LT |
269 | |
270 | return_VALUE(0); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
275 | * 1. Power on the power resources required for the wakeup device | |
276 | * 2. Enable _PSW (power state wake) for the device if present | |
277 | */ | |
4be44fcd | 278 | int acpi_enable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 279 | { |
4be44fcd LB |
280 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
281 | struct acpi_object_list arg_list = { 1, &arg }; | |
282 | acpi_status status = AE_OK; | |
283 | int i; | |
284 | int ret = 0; | |
1da177e4 LT |
285 | |
286 | ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device_power"); | |
287 | if (!dev || !dev->wakeup.flags.valid) | |
288 | return_VALUE(-1); | |
289 | ||
290 | arg.integer.value = 1; | |
291 | /* Open power resource */ | |
292 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
293 | ret = acpi_power_on(dev->wakeup.resources.handles[i]); | |
294 | if (ret) { | |
4be44fcd LB |
295 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
296 | "Error transition power state\n")); | |
1da177e4 LT |
297 | dev->wakeup.flags.valid = 0; |
298 | return_VALUE(-1); | |
299 | } | |
300 | } | |
301 | ||
302 | /* Execute PSW */ | |
303 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
304 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
305 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluate _PSW\n")); | |
306 | dev->wakeup.flags.valid = 0; | |
307 | ret = -1; | |
308 | } | |
309 | ||
310 | return_VALUE(ret); | |
311 | } | |
312 | ||
313 | /* | |
314 | * Shutdown a wakeup device, counterpart of above method | |
315 | * 1. Disable _PSW (power state wake) | |
316 | * 2. Shutdown down the power resources | |
317 | */ | |
4be44fcd | 318 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 319 | { |
4be44fcd LB |
320 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
321 | struct acpi_object_list arg_list = { 1, &arg }; | |
322 | acpi_status status = AE_OK; | |
323 | int i; | |
324 | int ret = 0; | |
1da177e4 LT |
325 | |
326 | ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device_power"); | |
327 | ||
328 | if (!dev || !dev->wakeup.flags.valid) | |
329 | return_VALUE(-1); | |
330 | ||
4be44fcd | 331 | arg.integer.value = 0; |
1da177e4 LT |
332 | /* Execute PSW */ |
333 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
334 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
335 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluate _PSW\n")); | |
336 | dev->wakeup.flags.valid = 0; | |
337 | return_VALUE(-1); | |
338 | } | |
339 | ||
340 | /* Close power resource */ | |
341 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
342 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i]); | |
343 | if (ret) { | |
4be44fcd LB |
344 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
345 | "Error transition power state\n")); | |
1da177e4 LT |
346 | dev->wakeup.flags.valid = 0; |
347 | return_VALUE(-1); | |
348 | } | |
349 | } | |
350 | ||
351 | return_VALUE(ret); | |
352 | } | |
353 | ||
354 | /* -------------------------------------------------------------------------- | |
355 | Device Power Management | |
356 | -------------------------------------------------------------------------- */ | |
357 | ||
4be44fcd | 358 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 359 | { |
4be44fcd LB |
360 | int result = 0; |
361 | struct acpi_handle_list *list = NULL; | |
362 | int list_state = 0; | |
363 | int i = 0; | |
1da177e4 LT |
364 | |
365 | ACPI_FUNCTION_TRACE("acpi_power_get_inferred_state"); | |
366 | ||
367 | if (!device) | |
368 | return_VALUE(-EINVAL); | |
369 | ||
370 | device->power.state = ACPI_STATE_UNKNOWN; | |
371 | ||
372 | /* | |
373 | * We know a device's inferred power state when all the resources | |
374 | * required for a given D-state are 'on'. | |
375 | */ | |
4be44fcd | 376 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
377 | list = &device->power.states[i].resources; |
378 | if (list->count < 1) | |
379 | continue; | |
380 | ||
381 | result = acpi_power_get_list_state(list, &list_state); | |
382 | if (result) | |
383 | return_VALUE(result); | |
384 | ||
385 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
386 | device->power.state = i; | |
387 | return_VALUE(0); | |
388 | } | |
389 | } | |
390 | ||
391 | device->power.state = ACPI_STATE_D3; | |
392 | ||
393 | return_VALUE(0); | |
394 | } | |
395 | ||
4be44fcd | 396 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 397 | { |
4be44fcd LB |
398 | int result = 0; |
399 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
400 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
401 | int i = 0; | |
1da177e4 LT |
402 | |
403 | ACPI_FUNCTION_TRACE("acpi_power_transition"); | |
404 | ||
405 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
406 | return_VALUE(-EINVAL); | |
407 | ||
4be44fcd LB |
408 | if ((device->power.state < ACPI_STATE_D0) |
409 | || (device->power.state > ACPI_STATE_D3)) | |
1da177e4 LT |
410 | return_VALUE(-ENODEV); |
411 | ||
412 | cl = &device->power.states[device->power.state].resources; | |
413 | tl = &device->power.states[state].resources; | |
414 | ||
415 | device->power.state = ACPI_STATE_UNKNOWN; | |
416 | ||
417 | if (!cl->count && !tl->count) { | |
418 | result = -ENODEV; | |
419 | goto end; | |
420 | } | |
421 | ||
422 | /* TBD: Resources must be ordered. */ | |
423 | ||
424 | /* | |
425 | * First we reference all power resources required in the target list | |
426 | * (e.g. so the device doesn't lose power while transitioning). | |
427 | */ | |
4be44fcd | 428 | for (i = 0; i < tl->count; i++) { |
1da177e4 LT |
429 | result = acpi_power_on(tl->handles[i]); |
430 | if (result) | |
431 | goto end; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Then we dereference all power resources used in the current list. | |
436 | */ | |
4be44fcd | 437 | for (i = 0; i < cl->count; i++) { |
1da177e4 LT |
438 | result = acpi_power_off_device(cl->handles[i]); |
439 | if (result) | |
440 | goto end; | |
441 | } | |
442 | ||
443 | /* We shouldn't change the state till all above operations succeed */ | |
444 | device->power.state = state; | |
4be44fcd | 445 | end: |
1da177e4 | 446 | if (result) |
4be44fcd LB |
447 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
448 | "Error transitioning device [%s] to D%d\n", | |
449 | device->pnp.bus_id, state)); | |
1da177e4 LT |
450 | |
451 | return_VALUE(result); | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* -------------------------------------------------------------------------- |
455 | FS Interface (/proc) | |
456 | -------------------------------------------------------------------------- */ | |
457 | ||
4be44fcd | 458 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
459 | |
460 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
461 | { | |
462 | struct acpi_power_resource *resource = NULL; | |
463 | ||
464 | ACPI_FUNCTION_TRACE("acpi_power_seq_show"); | |
465 | ||
466 | resource = (struct acpi_power_resource *)seq->private; | |
467 | ||
468 | if (!resource) | |
469 | goto end; | |
470 | ||
471 | seq_puts(seq, "state: "); | |
472 | switch (resource->state) { | |
473 | case ACPI_POWER_RESOURCE_STATE_ON: | |
474 | seq_puts(seq, "on\n"); | |
475 | break; | |
476 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
477 | seq_puts(seq, "off\n"); | |
478 | break; | |
479 | default: | |
480 | seq_puts(seq, "unknown\n"); | |
481 | break; | |
482 | } | |
483 | ||
484 | seq_printf(seq, "system level: S%d\n" | |
4be44fcd LB |
485 | "order: %d\n" |
486 | "reference count: %d\n", | |
487 | resource->system_level, | |
488 | resource->order, resource->references); | |
1da177e4 | 489 | |
4be44fcd | 490 | end: |
1da177e4 LT |
491 | return_VALUE(0); |
492 | } | |
493 | ||
494 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
495 | { | |
496 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
497 | } | |
498 | ||
4be44fcd | 499 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 500 | { |
4be44fcd | 501 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
502 | |
503 | ACPI_FUNCTION_TRACE("acpi_power_add_fs"); | |
504 | ||
505 | if (!device) | |
506 | return_VALUE(-EINVAL); | |
507 | ||
508 | if (!acpi_device_dir(device)) { | |
509 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 510 | acpi_power_dir); |
1da177e4 LT |
511 | if (!acpi_device_dir(device)) |
512 | return_VALUE(-ENODEV); | |
513 | } | |
514 | ||
515 | /* 'status' [R] */ | |
516 | entry = create_proc_entry(ACPI_POWER_FILE_STATUS, | |
4be44fcd | 517 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
518 | if (!entry) |
519 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
520 | "Unable to create '%s' fs entry\n", |
521 | ACPI_POWER_FILE_STATUS)); | |
1da177e4 LT |
522 | else { |
523 | entry->proc_fops = &acpi_power_fops; | |
524 | entry->data = acpi_driver_data(device); | |
525 | } | |
526 | ||
527 | return_VALUE(0); | |
528 | } | |
529 | ||
4be44fcd | 530 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 LT |
531 | { |
532 | ACPI_FUNCTION_TRACE("acpi_power_remove_fs"); | |
533 | ||
534 | if (acpi_device_dir(device)) { | |
535 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
536 | acpi_device_dir(device)); | |
537 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
538 | acpi_device_dir(device) = NULL; | |
539 | } | |
540 | ||
541 | return_VALUE(0); | |
542 | } | |
543 | ||
1da177e4 LT |
544 | /* -------------------------------------------------------------------------- |
545 | Driver Interface | |
546 | -------------------------------------------------------------------------- */ | |
547 | ||
4be44fcd | 548 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 549 | { |
4be44fcd LB |
550 | int result = 0; |
551 | acpi_status status = AE_OK; | |
1da177e4 | 552 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
553 | union acpi_object acpi_object; |
554 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 LT |
555 | |
556 | ACPI_FUNCTION_TRACE("acpi_power_add"); | |
557 | ||
558 | if (!device) | |
559 | return_VALUE(-EINVAL); | |
560 | ||
561 | resource = kmalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); | |
562 | if (!resource) | |
563 | return_VALUE(-ENOMEM); | |
564 | memset(resource, 0, sizeof(struct acpi_power_resource)); | |
565 | ||
566 | resource->handle = device->handle; | |
567 | strcpy(resource->name, device->pnp.bus_id); | |
568 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
569 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
570 | acpi_driver_data(device) = resource; | |
571 | ||
572 | /* Evalute the object to get the system level and resource order. */ | |
573 | status = acpi_evaluate_object(resource->handle, NULL, NULL, &buffer); | |
574 | if (ACPI_FAILURE(status)) { | |
575 | result = -ENODEV; | |
576 | goto end; | |
577 | } | |
578 | resource->system_level = acpi_object.power_resource.system_level; | |
579 | resource->order = acpi_object.power_resource.resource_order; | |
580 | ||
581 | result = acpi_power_get_state(resource); | |
582 | if (result) | |
583 | goto end; | |
584 | ||
585 | switch (resource->state) { | |
586 | case ACPI_POWER_RESOURCE_STATE_ON: | |
587 | device->power.state = ACPI_STATE_D0; | |
588 | break; | |
589 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
590 | device->power.state = ACPI_STATE_D3; | |
591 | break; | |
592 | default: | |
593 | device->power.state = ACPI_STATE_UNKNOWN; | |
594 | break; | |
595 | } | |
596 | ||
597 | result = acpi_power_add_fs(device); | |
598 | if (result) | |
599 | goto end; | |
4be44fcd | 600 | |
1da177e4 | 601 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
4be44fcd | 602 | acpi_device_bid(device), resource->state ? "on" : "off"); |
1da177e4 | 603 | |
4be44fcd | 604 | end: |
1da177e4 LT |
605 | if (result) |
606 | kfree(resource); | |
4be44fcd | 607 | |
1da177e4 LT |
608 | return_VALUE(result); |
609 | } | |
610 | ||
4be44fcd | 611 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
612 | { |
613 | struct acpi_power_resource *resource = NULL; | |
614 | ||
615 | ACPI_FUNCTION_TRACE("acpi_power_remove"); | |
616 | ||
617 | if (!device || !acpi_driver_data(device)) | |
618 | return_VALUE(-EINVAL); | |
619 | ||
4be44fcd | 620 | resource = (struct acpi_power_resource *)acpi_driver_data(device); |
1da177e4 LT |
621 | |
622 | acpi_power_remove_fs(device); | |
623 | ||
624 | kfree(resource); | |
625 | ||
626 | return_VALUE(0); | |
627 | } | |
628 | ||
4be44fcd | 629 | static int __init acpi_power_init(void) |
1da177e4 | 630 | { |
4be44fcd | 631 | int result = 0; |
1da177e4 LT |
632 | |
633 | ACPI_FUNCTION_TRACE("acpi_power_init"); | |
634 | ||
635 | if (acpi_disabled) | |
636 | return_VALUE(0); | |
637 | ||
638 | INIT_LIST_HEAD(&acpi_power_resource_list); | |
639 | ||
640 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
641 | if (!acpi_power_dir) | |
642 | return_VALUE(-ENODEV); | |
643 | ||
644 | result = acpi_bus_register_driver(&acpi_power_driver); | |
645 | if (result < 0) { | |
646 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
647 | return_VALUE(-ENODEV); | |
648 | } | |
649 | ||
650 | return_VALUE(0); | |
651 | } | |
652 | ||
653 | subsys_initcall(acpi_power_init); |