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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 |
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) { | |
a6fc6720 | 108 | ACPI_WARNING((AE_INFO, "Getting context [%p]", handle)); |
1da177e4 LT |
109 | return_VALUE(result); |
110 | } | |
111 | ||
4be44fcd | 112 | *resource = (struct acpi_power_resource *)acpi_driver_data(device); |
1da177e4 LT |
113 | if (!resource) |
114 | return_VALUE(-ENODEV); | |
115 | ||
116 | return_VALUE(0); | |
117 | } | |
118 | ||
4be44fcd | 119 | static int acpi_power_get_state(struct acpi_power_resource *resource) |
1da177e4 | 120 | { |
4be44fcd LB |
121 | acpi_status status = AE_OK; |
122 | unsigned long sta = 0; | |
1da177e4 LT |
123 | |
124 | ACPI_FUNCTION_TRACE("acpi_power_get_state"); | |
125 | ||
126 | if (!resource) | |
127 | return_VALUE(-EINVAL); | |
128 | ||
129 | status = acpi_evaluate_integer(resource->handle, "_STA", NULL, &sta); | |
130 | if (ACPI_FAILURE(status)) | |
131 | return_VALUE(-ENODEV); | |
132 | ||
133 | if (sta & 0x01) | |
134 | resource->state = ACPI_POWER_RESOURCE_STATE_ON; | |
135 | else | |
136 | resource->state = ACPI_POWER_RESOURCE_STATE_OFF; | |
137 | ||
138 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", | |
4be44fcd | 139 | resource->name, resource->state ? "on" : "off")); |
1da177e4 LT |
140 | |
141 | return_VALUE(0); | |
142 | } | |
143 | ||
4be44fcd | 144 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 145 | { |
4be44fcd | 146 | int result = 0; |
1da177e4 | 147 | struct acpi_power_resource *resource = NULL; |
4be44fcd | 148 | u32 i = 0; |
1da177e4 LT |
149 | |
150 | ACPI_FUNCTION_TRACE("acpi_power_get_list_state"); | |
151 | ||
152 | if (!list || !state) | |
153 | return_VALUE(-EINVAL); | |
154 | ||
155 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
156 | ||
4be44fcd | 157 | for (i = 0; i < list->count; i++) { |
1da177e4 LT |
158 | result = acpi_power_get_context(list->handles[i], &resource); |
159 | if (result) | |
160 | return_VALUE(result); | |
161 | result = acpi_power_get_state(resource); | |
162 | if (result) | |
163 | return_VALUE(result); | |
164 | ||
165 | *state = resource->state; | |
166 | ||
167 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
168 | break; | |
169 | } | |
170 | ||
171 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 172 | *state ? "on" : "off")); |
1da177e4 LT |
173 | |
174 | return_VALUE(result); | |
175 | } | |
176 | ||
4be44fcd | 177 | static int acpi_power_on(acpi_handle handle) |
1da177e4 | 178 | { |
4be44fcd LB |
179 | int result = 0; |
180 | acpi_status status = AE_OK; | |
181 | struct acpi_device *device = NULL; | |
1da177e4 LT |
182 | struct acpi_power_resource *resource = NULL; |
183 | ||
184 | ACPI_FUNCTION_TRACE("acpi_power_on"); | |
185 | ||
186 | result = acpi_power_get_context(handle, &resource); | |
187 | if (result) | |
188 | return_VALUE(result); | |
189 | ||
190 | resource->references++; | |
191 | ||
4be44fcd LB |
192 | if ((resource->references > 1) |
193 | || (resource->state == ACPI_POWER_RESOURCE_STATE_ON)) { | |
1da177e4 | 194 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n", |
4be44fcd | 195 | resource->name)); |
1da177e4 LT |
196 | return_VALUE(0); |
197 | } | |
198 | ||
199 | status = acpi_evaluate_object(resource->handle, "_ON", NULL, NULL); | |
200 | if (ACPI_FAILURE(status)) | |
201 | return_VALUE(-ENODEV); | |
202 | ||
203 | result = acpi_power_get_state(resource); | |
204 | if (result) | |
205 | return_VALUE(result); | |
206 | if (resource->state != ACPI_POWER_RESOURCE_STATE_ON) | |
207 | return_VALUE(-ENOEXEC); | |
208 | ||
209 | /* Update the power resource's _device_ power state */ | |
210 | result = acpi_bus_get_device(resource->handle, &device); | |
211 | if (result) | |
212 | return_VALUE(result); | |
213 | device->power.state = ACPI_STATE_D0; | |
214 | ||
215 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 216 | resource->name)); |
1da177e4 LT |
217 | |
218 | return_VALUE(0); | |
219 | } | |
220 | ||
4be44fcd | 221 | static int acpi_power_off_device(acpi_handle handle) |
1da177e4 | 222 | { |
4be44fcd LB |
223 | int result = 0; |
224 | acpi_status status = AE_OK; | |
225 | struct acpi_device *device = NULL; | |
1da177e4 LT |
226 | struct acpi_power_resource *resource = NULL; |
227 | ||
228 | ACPI_FUNCTION_TRACE("acpi_power_off_device"); | |
229 | ||
230 | result = acpi_power_get_context(handle, &resource); | |
231 | if (result) | |
232 | return_VALUE(result); | |
233 | ||
234 | if (resource->references) | |
235 | resource->references--; | |
236 | ||
237 | if (resource->references) { | |
4be44fcd LB |
238 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
239 | "Resource [%s] is still in use, dereferencing\n", | |
240 | device->pnp.bus_id)); | |
1da177e4 LT |
241 | return_VALUE(0); |
242 | } | |
243 | ||
244 | if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) { | |
245 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n", | |
4be44fcd | 246 | device->pnp.bus_id)); |
1da177e4 LT |
247 | return_VALUE(0); |
248 | } | |
249 | ||
250 | status = acpi_evaluate_object(resource->handle, "_OFF", NULL, NULL); | |
251 | if (ACPI_FAILURE(status)) | |
252 | return_VALUE(-ENODEV); | |
253 | ||
254 | result = acpi_power_get_state(resource); | |
255 | if (result) | |
256 | return_VALUE(result); | |
257 | if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF) | |
258 | return_VALUE(-ENOEXEC); | |
259 | ||
260 | /* Update the power resource's _device_ power state */ | |
261 | result = acpi_bus_get_device(resource->handle, &device); | |
262 | if (result) | |
263 | return_VALUE(result); | |
264 | device->power.state = ACPI_STATE_D3; | |
265 | ||
266 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 267 | resource->name)); |
1da177e4 LT |
268 | |
269 | return_VALUE(0); | |
270 | } | |
271 | ||
272 | /* | |
273 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
274 | * 1. Power on the power resources required for the wakeup device | |
275 | * 2. Enable _PSW (power state wake) for the device if present | |
276 | */ | |
4be44fcd | 277 | int acpi_enable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 278 | { |
4be44fcd LB |
279 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
280 | struct acpi_object_list arg_list = { 1, &arg }; | |
281 | acpi_status status = AE_OK; | |
282 | int i; | |
283 | int ret = 0; | |
1da177e4 LT |
284 | |
285 | ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device_power"); | |
286 | if (!dev || !dev->wakeup.flags.valid) | |
287 | return_VALUE(-1); | |
288 | ||
289 | arg.integer.value = 1; | |
290 | /* Open power resource */ | |
291 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
292 | ret = acpi_power_on(dev->wakeup.resources.handles[i]); | |
293 | if (ret) { | |
a6fc6720 | 294 | ACPI_ERROR((AE_INFO, "Transition power state")); |
1da177e4 LT |
295 | dev->wakeup.flags.valid = 0; |
296 | return_VALUE(-1); | |
297 | } | |
298 | } | |
299 | ||
300 | /* Execute PSW */ | |
301 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
302 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
a6fc6720 | 303 | ACPI_ERROR((AE_INFO, "Evaluate _PSW")); |
1da177e4 LT |
304 | dev->wakeup.flags.valid = 0; |
305 | ret = -1; | |
306 | } | |
307 | ||
308 | return_VALUE(ret); | |
309 | } | |
310 | ||
311 | /* | |
312 | * Shutdown a wakeup device, counterpart of above method | |
313 | * 1. Disable _PSW (power state wake) | |
314 | * 2. Shutdown down the power resources | |
315 | */ | |
4be44fcd | 316 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 317 | { |
4be44fcd LB |
318 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
319 | struct acpi_object_list arg_list = { 1, &arg }; | |
320 | acpi_status status = AE_OK; | |
321 | int i; | |
322 | int ret = 0; | |
1da177e4 LT |
323 | |
324 | ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device_power"); | |
325 | ||
326 | if (!dev || !dev->wakeup.flags.valid) | |
327 | return_VALUE(-1); | |
328 | ||
4be44fcd | 329 | arg.integer.value = 0; |
1da177e4 LT |
330 | /* Execute PSW */ |
331 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
332 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
a6fc6720 | 333 | ACPI_ERROR((AE_INFO, "Evaluate _PSW")); |
1da177e4 LT |
334 | dev->wakeup.flags.valid = 0; |
335 | return_VALUE(-1); | |
336 | } | |
337 | ||
338 | /* Close power resource */ | |
339 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
340 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i]); | |
341 | if (ret) { | |
a6fc6720 | 342 | ACPI_ERROR((AE_INFO, "Transition power state")); |
1da177e4 LT |
343 | dev->wakeup.flags.valid = 0; |
344 | return_VALUE(-1); | |
345 | } | |
346 | } | |
347 | ||
348 | return_VALUE(ret); | |
349 | } | |
350 | ||
351 | /* -------------------------------------------------------------------------- | |
352 | Device Power Management | |
353 | -------------------------------------------------------------------------- */ | |
354 | ||
4be44fcd | 355 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 356 | { |
4be44fcd LB |
357 | int result = 0; |
358 | struct acpi_handle_list *list = NULL; | |
359 | int list_state = 0; | |
360 | int i = 0; | |
1da177e4 LT |
361 | |
362 | ACPI_FUNCTION_TRACE("acpi_power_get_inferred_state"); | |
363 | ||
364 | if (!device) | |
365 | return_VALUE(-EINVAL); | |
366 | ||
367 | device->power.state = ACPI_STATE_UNKNOWN; | |
368 | ||
369 | /* | |
370 | * We know a device's inferred power state when all the resources | |
371 | * required for a given D-state are 'on'. | |
372 | */ | |
4be44fcd | 373 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
374 | list = &device->power.states[i].resources; |
375 | if (list->count < 1) | |
376 | continue; | |
377 | ||
378 | result = acpi_power_get_list_state(list, &list_state); | |
379 | if (result) | |
380 | return_VALUE(result); | |
381 | ||
382 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
383 | device->power.state = i; | |
384 | return_VALUE(0); | |
385 | } | |
386 | } | |
387 | ||
388 | device->power.state = ACPI_STATE_D3; | |
389 | ||
390 | return_VALUE(0); | |
391 | } | |
392 | ||
4be44fcd | 393 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 394 | { |
4be44fcd LB |
395 | int result = 0; |
396 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
397 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
398 | int i = 0; | |
1da177e4 LT |
399 | |
400 | ACPI_FUNCTION_TRACE("acpi_power_transition"); | |
401 | ||
402 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
403 | return_VALUE(-EINVAL); | |
404 | ||
4be44fcd LB |
405 | if ((device->power.state < ACPI_STATE_D0) |
406 | || (device->power.state > ACPI_STATE_D3)) | |
1da177e4 LT |
407 | return_VALUE(-ENODEV); |
408 | ||
409 | cl = &device->power.states[device->power.state].resources; | |
410 | tl = &device->power.states[state].resources; | |
411 | ||
412 | device->power.state = ACPI_STATE_UNKNOWN; | |
413 | ||
414 | if (!cl->count && !tl->count) { | |
415 | result = -ENODEV; | |
416 | goto end; | |
417 | } | |
418 | ||
419 | /* TBD: Resources must be ordered. */ | |
420 | ||
421 | /* | |
422 | * First we reference all power resources required in the target list | |
423 | * (e.g. so the device doesn't lose power while transitioning). | |
424 | */ | |
4be44fcd | 425 | for (i = 0; i < tl->count; i++) { |
1da177e4 LT |
426 | result = acpi_power_on(tl->handles[i]); |
427 | if (result) | |
428 | goto end; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Then we dereference all power resources used in the current list. | |
433 | */ | |
4be44fcd | 434 | for (i = 0; i < cl->count; i++) { |
1da177e4 LT |
435 | result = acpi_power_off_device(cl->handles[i]); |
436 | if (result) | |
437 | goto end; | |
438 | } | |
439 | ||
440 | /* We shouldn't change the state till all above operations succeed */ | |
441 | device->power.state = state; | |
4be44fcd | 442 | end: |
1da177e4 | 443 | if (result) |
a6fc6720 TR |
444 | ACPI_WARNING((AE_INFO, "Transitioning device [%s] to D%d", |
445 | device->pnp.bus_id, state)); | |
1da177e4 LT |
446 | |
447 | return_VALUE(result); | |
448 | } | |
449 | ||
1da177e4 LT |
450 | /* -------------------------------------------------------------------------- |
451 | FS Interface (/proc) | |
452 | -------------------------------------------------------------------------- */ | |
453 | ||
4be44fcd | 454 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
455 | |
456 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
457 | { | |
458 | struct acpi_power_resource *resource = NULL; | |
459 | ||
460 | ACPI_FUNCTION_TRACE("acpi_power_seq_show"); | |
461 | ||
462 | resource = (struct acpi_power_resource *)seq->private; | |
463 | ||
464 | if (!resource) | |
465 | goto end; | |
466 | ||
467 | seq_puts(seq, "state: "); | |
468 | switch (resource->state) { | |
469 | case ACPI_POWER_RESOURCE_STATE_ON: | |
470 | seq_puts(seq, "on\n"); | |
471 | break; | |
472 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
473 | seq_puts(seq, "off\n"); | |
474 | break; | |
475 | default: | |
476 | seq_puts(seq, "unknown\n"); | |
477 | break; | |
478 | } | |
479 | ||
480 | seq_printf(seq, "system level: S%d\n" | |
4be44fcd LB |
481 | "order: %d\n" |
482 | "reference count: %d\n", | |
483 | resource->system_level, | |
484 | resource->order, resource->references); | |
1da177e4 | 485 | |
4be44fcd | 486 | end: |
1da177e4 LT |
487 | return_VALUE(0); |
488 | } | |
489 | ||
490 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
491 | { | |
492 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
493 | } | |
494 | ||
4be44fcd | 495 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 496 | { |
4be44fcd | 497 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
498 | |
499 | ACPI_FUNCTION_TRACE("acpi_power_add_fs"); | |
500 | ||
501 | if (!device) | |
502 | return_VALUE(-EINVAL); | |
503 | ||
504 | if (!acpi_device_dir(device)) { | |
505 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 506 | acpi_power_dir); |
1da177e4 LT |
507 | if (!acpi_device_dir(device)) |
508 | return_VALUE(-ENODEV); | |
509 | } | |
510 | ||
511 | /* 'status' [R] */ | |
512 | entry = create_proc_entry(ACPI_POWER_FILE_STATUS, | |
4be44fcd | 513 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 | 514 | if (!entry) |
a6fc6720 | 515 | return_VALUE(-EIO); |
1da177e4 LT |
516 | else { |
517 | entry->proc_fops = &acpi_power_fops; | |
518 | entry->data = acpi_driver_data(device); | |
519 | } | |
520 | ||
521 | return_VALUE(0); | |
522 | } | |
523 | ||
4be44fcd | 524 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 LT |
525 | { |
526 | ACPI_FUNCTION_TRACE("acpi_power_remove_fs"); | |
527 | ||
528 | if (acpi_device_dir(device)) { | |
529 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
530 | acpi_device_dir(device)); | |
531 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
532 | acpi_device_dir(device) = NULL; | |
533 | } | |
534 | ||
535 | return_VALUE(0); | |
536 | } | |
537 | ||
1da177e4 LT |
538 | /* -------------------------------------------------------------------------- |
539 | Driver Interface | |
540 | -------------------------------------------------------------------------- */ | |
541 | ||
4be44fcd | 542 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 543 | { |
4be44fcd LB |
544 | int result = 0; |
545 | acpi_status status = AE_OK; | |
1da177e4 | 546 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
547 | union acpi_object acpi_object; |
548 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 LT |
549 | |
550 | ACPI_FUNCTION_TRACE("acpi_power_add"); | |
551 | ||
552 | if (!device) | |
553 | return_VALUE(-EINVAL); | |
554 | ||
555 | resource = kmalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); | |
556 | if (!resource) | |
557 | return_VALUE(-ENOMEM); | |
558 | memset(resource, 0, sizeof(struct acpi_power_resource)); | |
559 | ||
560 | resource->handle = device->handle; | |
561 | strcpy(resource->name, device->pnp.bus_id); | |
562 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
563 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
564 | acpi_driver_data(device) = resource; | |
565 | ||
566 | /* Evalute the object to get the system level and resource order. */ | |
567 | status = acpi_evaluate_object(resource->handle, NULL, NULL, &buffer); | |
568 | if (ACPI_FAILURE(status)) { | |
569 | result = -ENODEV; | |
570 | goto end; | |
571 | } | |
572 | resource->system_level = acpi_object.power_resource.system_level; | |
573 | resource->order = acpi_object.power_resource.resource_order; | |
574 | ||
575 | result = acpi_power_get_state(resource); | |
576 | if (result) | |
577 | goto end; | |
578 | ||
579 | switch (resource->state) { | |
580 | case ACPI_POWER_RESOURCE_STATE_ON: | |
581 | device->power.state = ACPI_STATE_D0; | |
582 | break; | |
583 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
584 | device->power.state = ACPI_STATE_D3; | |
585 | break; | |
586 | default: | |
587 | device->power.state = ACPI_STATE_UNKNOWN; | |
588 | break; | |
589 | } | |
590 | ||
591 | result = acpi_power_add_fs(device); | |
592 | if (result) | |
593 | goto end; | |
4be44fcd | 594 | |
1da177e4 | 595 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
4be44fcd | 596 | acpi_device_bid(device), resource->state ? "on" : "off"); |
1da177e4 | 597 | |
4be44fcd | 598 | end: |
1da177e4 LT |
599 | if (result) |
600 | kfree(resource); | |
4be44fcd | 601 | |
1da177e4 LT |
602 | return_VALUE(result); |
603 | } | |
604 | ||
4be44fcd | 605 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
606 | { |
607 | struct acpi_power_resource *resource = NULL; | |
608 | ||
609 | ACPI_FUNCTION_TRACE("acpi_power_remove"); | |
610 | ||
611 | if (!device || !acpi_driver_data(device)) | |
612 | return_VALUE(-EINVAL); | |
613 | ||
4be44fcd | 614 | resource = (struct acpi_power_resource *)acpi_driver_data(device); |
1da177e4 LT |
615 | |
616 | acpi_power_remove_fs(device); | |
617 | ||
618 | kfree(resource); | |
619 | ||
620 | return_VALUE(0); | |
621 | } | |
622 | ||
4be44fcd | 623 | static int __init acpi_power_init(void) |
1da177e4 | 624 | { |
4be44fcd | 625 | int result = 0; |
1da177e4 LT |
626 | |
627 | ACPI_FUNCTION_TRACE("acpi_power_init"); | |
628 | ||
629 | if (acpi_disabled) | |
630 | return_VALUE(0); | |
631 | ||
632 | INIT_LIST_HEAD(&acpi_power_resource_list); | |
633 | ||
634 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
635 | if (!acpi_power_dir) | |
636 | return_VALUE(-ENODEV); | |
637 | ||
638 | result = acpi_bus_register_driver(&acpi_power_driver); | |
639 | if (result < 0) { | |
640 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
641 | return_VALUE(-ENODEV); | |
642 | } | |
643 | ||
644 | return_VALUE(0); | |
645 | } | |
646 | ||
647 | subsys_initcall(acpi_power_init); |