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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; | |
41598572 | 74 | struct acpi_device * device; |
4be44fcd LB |
75 | acpi_bus_id name; |
76 | u32 system_level; | |
77 | u32 order; | |
78 | int state; | |
79 | int references; | |
1da177e4 LT |
80 | }; |
81 | ||
4be44fcd | 82 | static struct list_head acpi_power_resource_list; |
1da177e4 LT |
83 | |
84 | static struct file_operations acpi_power_fops = { | |
4be44fcd LB |
85 | .open = acpi_power_open_fs, |
86 | .read = seq_read, | |
87 | .llseek = seq_lseek, | |
88 | .release = single_release, | |
1da177e4 LT |
89 | }; |
90 | ||
91 | /* -------------------------------------------------------------------------- | |
92 | Power Resource Management | |
93 | -------------------------------------------------------------------------- */ | |
94 | ||
95 | static int | |
4be44fcd LB |
96 | acpi_power_get_context(acpi_handle handle, |
97 | struct acpi_power_resource **resource) | |
1da177e4 | 98 | { |
4be44fcd LB |
99 | int result = 0; |
100 | struct acpi_device *device = NULL; | |
1da177e4 | 101 | |
1da177e4 LT |
102 | |
103 | if (!resource) | |
d550d98d | 104 | return -ENODEV; |
1da177e4 LT |
105 | |
106 | result = acpi_bus_get_device(handle, &device); | |
107 | if (result) { | |
cece9296 | 108 | printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle); |
d550d98d | 109 | return result; |
1da177e4 LT |
110 | } |
111 | ||
4be44fcd | 112 | *resource = (struct acpi_power_resource *)acpi_driver_data(device); |
1da177e4 | 113 | if (!resource) |
d550d98d | 114 | return -ENODEV; |
1da177e4 | 115 | |
d550d98d | 116 | return 0; |
1da177e4 LT |
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 | 123 | |
1da177e4 LT |
124 | |
125 | if (!resource) | |
d550d98d | 126 | return -EINVAL; |
1da177e4 LT |
127 | |
128 | status = acpi_evaluate_integer(resource->handle, "_STA", NULL, &sta); | |
129 | if (ACPI_FAILURE(status)) | |
d550d98d | 130 | return -ENODEV; |
1da177e4 LT |
131 | |
132 | if (sta & 0x01) | |
133 | resource->state = ACPI_POWER_RESOURCE_STATE_ON; | |
134 | else | |
135 | resource->state = ACPI_POWER_RESOURCE_STATE_OFF; | |
136 | ||
137 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", | |
4be44fcd | 138 | resource->name, resource->state ? "on" : "off")); |
1da177e4 | 139 | |
d550d98d | 140 | return 0; |
1da177e4 LT |
141 | } |
142 | ||
4be44fcd | 143 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 144 | { |
4be44fcd | 145 | int result = 0; |
1da177e4 | 146 | struct acpi_power_resource *resource = NULL; |
4be44fcd | 147 | u32 i = 0; |
1da177e4 | 148 | |
1da177e4 LT |
149 | |
150 | if (!list || !state) | |
d550d98d | 151 | return -EINVAL; |
1da177e4 LT |
152 | |
153 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
154 | ||
4be44fcd | 155 | for (i = 0; i < list->count; i++) { |
1da177e4 LT |
156 | result = acpi_power_get_context(list->handles[i], &resource); |
157 | if (result) | |
d550d98d | 158 | return result; |
1da177e4 LT |
159 | result = acpi_power_get_state(resource); |
160 | if (result) | |
d550d98d | 161 | return result; |
1da177e4 LT |
162 | |
163 | *state = resource->state; | |
164 | ||
165 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
166 | break; | |
167 | } | |
168 | ||
169 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 170 | *state ? "on" : "off")); |
1da177e4 | 171 | |
d550d98d | 172 | return result; |
1da177e4 LT |
173 | } |
174 | ||
4be44fcd | 175 | static int acpi_power_on(acpi_handle handle) |
1da177e4 | 176 | { |
4be44fcd LB |
177 | int result = 0; |
178 | acpi_status status = AE_OK; | |
179 | struct acpi_device *device = NULL; | |
1da177e4 LT |
180 | struct acpi_power_resource *resource = NULL; |
181 | ||
1da177e4 LT |
182 | |
183 | result = acpi_power_get_context(handle, &resource); | |
184 | if (result) | |
d550d98d | 185 | return result; |
1da177e4 LT |
186 | |
187 | resource->references++; | |
188 | ||
4be44fcd LB |
189 | if ((resource->references > 1) |
190 | || (resource->state == ACPI_POWER_RESOURCE_STATE_ON)) { | |
1da177e4 | 191 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n", |
4be44fcd | 192 | resource->name)); |
d550d98d | 193 | return 0; |
1da177e4 LT |
194 | } |
195 | ||
196 | status = acpi_evaluate_object(resource->handle, "_ON", NULL, NULL); | |
197 | if (ACPI_FAILURE(status)) | |
d550d98d | 198 | return -ENODEV; |
1da177e4 LT |
199 | |
200 | result = acpi_power_get_state(resource); | |
201 | if (result) | |
d550d98d | 202 | return result; |
1da177e4 | 203 | if (resource->state != ACPI_POWER_RESOURCE_STATE_ON) |
d550d98d | 204 | return -ENOEXEC; |
1da177e4 LT |
205 | |
206 | /* Update the power resource's _device_ power state */ | |
41598572 PM |
207 | device = resource->device; |
208 | resource->device->power.state = ACPI_STATE_D0; | |
1da177e4 LT |
209 | |
210 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 211 | resource->name)); |
1da177e4 | 212 | |
d550d98d | 213 | return 0; |
1da177e4 LT |
214 | } |
215 | ||
4be44fcd | 216 | static int acpi_power_off_device(acpi_handle handle) |
1da177e4 | 217 | { |
4be44fcd LB |
218 | int result = 0; |
219 | acpi_status status = AE_OK; | |
220 | struct acpi_device *device = NULL; | |
1da177e4 LT |
221 | struct acpi_power_resource *resource = NULL; |
222 | ||
1da177e4 LT |
223 | |
224 | result = acpi_power_get_context(handle, &resource); | |
225 | if (result) | |
d550d98d | 226 | return result; |
1da177e4 LT |
227 | |
228 | if (resource->references) | |
229 | resource->references--; | |
230 | ||
231 | if (resource->references) { | |
4be44fcd LB |
232 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
233 | "Resource [%s] is still in use, dereferencing\n", | |
234 | device->pnp.bus_id)); | |
d550d98d | 235 | return 0; |
1da177e4 LT |
236 | } |
237 | ||
238 | if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) { | |
239 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n", | |
4be44fcd | 240 | device->pnp.bus_id)); |
d550d98d | 241 | return 0; |
1da177e4 LT |
242 | } |
243 | ||
244 | status = acpi_evaluate_object(resource->handle, "_OFF", NULL, NULL); | |
245 | if (ACPI_FAILURE(status)) | |
d550d98d | 246 | return -ENODEV; |
1da177e4 LT |
247 | |
248 | result = acpi_power_get_state(resource); | |
249 | if (result) | |
d550d98d | 250 | return result; |
1da177e4 | 251 | if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF) |
d550d98d | 252 | return -ENOEXEC; |
1da177e4 LT |
253 | |
254 | /* Update the power resource's _device_ power state */ | |
41598572 | 255 | device = resource->device; |
1da177e4 LT |
256 | device->power.state = ACPI_STATE_D3; |
257 | ||
258 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 259 | resource->name)); |
1da177e4 | 260 | |
d550d98d | 261 | return 0; |
1da177e4 LT |
262 | } |
263 | ||
264 | /* | |
265 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
266 | * 1. Power on the power resources required for the wakeup device | |
267 | * 2. Enable _PSW (power state wake) for the device if present | |
268 | */ | |
4be44fcd | 269 | int acpi_enable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 270 | { |
4be44fcd LB |
271 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
272 | struct acpi_object_list arg_list = { 1, &arg }; | |
273 | acpi_status status = AE_OK; | |
274 | int i; | |
275 | int ret = 0; | |
1da177e4 | 276 | |
1da177e4 | 277 | if (!dev || !dev->wakeup.flags.valid) |
d550d98d | 278 | return -1; |
1da177e4 LT |
279 | |
280 | arg.integer.value = 1; | |
281 | /* Open power resource */ | |
282 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
283 | ret = acpi_power_on(dev->wakeup.resources.handles[i]); | |
284 | if (ret) { | |
6468463a | 285 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 286 | dev->wakeup.flags.valid = 0; |
d550d98d | 287 | return -1; |
1da177e4 LT |
288 | } |
289 | } | |
290 | ||
291 | /* Execute PSW */ | |
292 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
293 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
6468463a | 294 | printk(KERN_ERR PREFIX "Evaluate _PSW\n"); |
1da177e4 LT |
295 | dev->wakeup.flags.valid = 0; |
296 | ret = -1; | |
297 | } | |
298 | ||
d550d98d | 299 | return ret; |
1da177e4 LT |
300 | } |
301 | ||
302 | /* | |
303 | * Shutdown a wakeup device, counterpart of above method | |
304 | * 1. Disable _PSW (power state wake) | |
305 | * 2. Shutdown down the power resources | |
306 | */ | |
4be44fcd | 307 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 308 | { |
4be44fcd LB |
309 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
310 | struct acpi_object_list arg_list = { 1, &arg }; | |
311 | acpi_status status = AE_OK; | |
312 | int i; | |
313 | int ret = 0; | |
1da177e4 | 314 | |
1da177e4 LT |
315 | |
316 | if (!dev || !dev->wakeup.flags.valid) | |
d550d98d | 317 | return -1; |
1da177e4 | 318 | |
4be44fcd | 319 | arg.integer.value = 0; |
1da177e4 LT |
320 | /* Execute PSW */ |
321 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
322 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
6468463a | 323 | printk(KERN_ERR PREFIX "Evaluate _PSW\n"); |
1da177e4 | 324 | dev->wakeup.flags.valid = 0; |
d550d98d | 325 | return -1; |
1da177e4 LT |
326 | } |
327 | ||
328 | /* Close power resource */ | |
329 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
330 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i]); | |
331 | if (ret) { | |
6468463a | 332 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 333 | dev->wakeup.flags.valid = 0; |
d550d98d | 334 | return -1; |
1da177e4 LT |
335 | } |
336 | } | |
337 | ||
d550d98d | 338 | return ret; |
1da177e4 LT |
339 | } |
340 | ||
341 | /* -------------------------------------------------------------------------- | |
342 | Device Power Management | |
343 | -------------------------------------------------------------------------- */ | |
344 | ||
4be44fcd | 345 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 346 | { |
4be44fcd LB |
347 | int result = 0; |
348 | struct acpi_handle_list *list = NULL; | |
349 | int list_state = 0; | |
350 | int i = 0; | |
1da177e4 | 351 | |
1da177e4 LT |
352 | |
353 | if (!device) | |
d550d98d | 354 | return -EINVAL; |
1da177e4 LT |
355 | |
356 | device->power.state = ACPI_STATE_UNKNOWN; | |
357 | ||
358 | /* | |
359 | * We know a device's inferred power state when all the resources | |
360 | * required for a given D-state are 'on'. | |
361 | */ | |
4be44fcd | 362 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
363 | list = &device->power.states[i].resources; |
364 | if (list->count < 1) | |
365 | continue; | |
366 | ||
367 | result = acpi_power_get_list_state(list, &list_state); | |
368 | if (result) | |
d550d98d | 369 | return result; |
1da177e4 LT |
370 | |
371 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
372 | device->power.state = i; | |
d550d98d | 373 | return 0; |
1da177e4 LT |
374 | } |
375 | } | |
376 | ||
377 | device->power.state = ACPI_STATE_D3; | |
378 | ||
d550d98d | 379 | return 0; |
1da177e4 LT |
380 | } |
381 | ||
4be44fcd | 382 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 383 | { |
4be44fcd LB |
384 | int result = 0; |
385 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
386 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
387 | int i = 0; | |
1da177e4 | 388 | |
1da177e4 LT |
389 | |
390 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
d550d98d | 391 | return -EINVAL; |
1da177e4 | 392 | |
4be44fcd LB |
393 | if ((device->power.state < ACPI_STATE_D0) |
394 | || (device->power.state > ACPI_STATE_D3)) | |
d550d98d | 395 | return -ENODEV; |
1da177e4 LT |
396 | |
397 | cl = &device->power.states[device->power.state].resources; | |
398 | tl = &device->power.states[state].resources; | |
399 | ||
400 | device->power.state = ACPI_STATE_UNKNOWN; | |
401 | ||
402 | if (!cl->count && !tl->count) { | |
403 | result = -ENODEV; | |
404 | goto end; | |
405 | } | |
406 | ||
407 | /* TBD: Resources must be ordered. */ | |
408 | ||
409 | /* | |
410 | * First we reference all power resources required in the target list | |
411 | * (e.g. so the device doesn't lose power while transitioning). | |
412 | */ | |
4be44fcd | 413 | for (i = 0; i < tl->count; i++) { |
1da177e4 LT |
414 | result = acpi_power_on(tl->handles[i]); |
415 | if (result) | |
416 | goto end; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Then we dereference all power resources used in the current list. | |
421 | */ | |
4be44fcd | 422 | for (i = 0; i < cl->count; i++) { |
1da177e4 LT |
423 | result = acpi_power_off_device(cl->handles[i]); |
424 | if (result) | |
425 | goto end; | |
426 | } | |
427 | ||
428 | /* We shouldn't change the state till all above operations succeed */ | |
429 | device->power.state = state; | |
4be44fcd | 430 | end: |
1da177e4 | 431 | if (result) |
cece9296 LB |
432 | printk(KERN_WARNING PREFIX "Transitioning device [%s] to D%d\n", |
433 | device->pnp.bus_id, state); | |
1da177e4 | 434 | |
d550d98d | 435 | return result; |
1da177e4 LT |
436 | } |
437 | ||
1da177e4 LT |
438 | /* -------------------------------------------------------------------------- |
439 | FS Interface (/proc) | |
440 | -------------------------------------------------------------------------- */ | |
441 | ||
4be44fcd | 442 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
443 | |
444 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
445 | { | |
446 | struct acpi_power_resource *resource = NULL; | |
447 | ||
1da177e4 LT |
448 | |
449 | resource = (struct acpi_power_resource *)seq->private; | |
450 | ||
451 | if (!resource) | |
452 | goto end; | |
453 | ||
454 | seq_puts(seq, "state: "); | |
455 | switch (resource->state) { | |
456 | case ACPI_POWER_RESOURCE_STATE_ON: | |
457 | seq_puts(seq, "on\n"); | |
458 | break; | |
459 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
460 | seq_puts(seq, "off\n"); | |
461 | break; | |
462 | default: | |
463 | seq_puts(seq, "unknown\n"); | |
464 | break; | |
465 | } | |
466 | ||
467 | seq_printf(seq, "system level: S%d\n" | |
4be44fcd LB |
468 | "order: %d\n" |
469 | "reference count: %d\n", | |
470 | resource->system_level, | |
471 | resource->order, resource->references); | |
1da177e4 | 472 | |
4be44fcd | 473 | end: |
d550d98d | 474 | return 0; |
1da177e4 LT |
475 | } |
476 | ||
477 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
478 | { | |
479 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
480 | } | |
481 | ||
4be44fcd | 482 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 483 | { |
4be44fcd | 484 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 485 | |
1da177e4 LT |
486 | |
487 | if (!device) | |
d550d98d | 488 | return -EINVAL; |
1da177e4 LT |
489 | |
490 | if (!acpi_device_dir(device)) { | |
491 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 492 | acpi_power_dir); |
1da177e4 | 493 | if (!acpi_device_dir(device)) |
d550d98d | 494 | return -ENODEV; |
1da177e4 LT |
495 | } |
496 | ||
497 | /* 'status' [R] */ | |
498 | entry = create_proc_entry(ACPI_POWER_FILE_STATUS, | |
4be44fcd | 499 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 | 500 | if (!entry) |
d550d98d | 501 | return -EIO; |
1da177e4 LT |
502 | else { |
503 | entry->proc_fops = &acpi_power_fops; | |
504 | entry->data = acpi_driver_data(device); | |
505 | } | |
506 | ||
d550d98d | 507 | return 0; |
1da177e4 LT |
508 | } |
509 | ||
4be44fcd | 510 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 | 511 | { |
1da177e4 LT |
512 | |
513 | if (acpi_device_dir(device)) { | |
514 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
515 | acpi_device_dir(device)); | |
516 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
517 | acpi_device_dir(device) = NULL; | |
518 | } | |
519 | ||
d550d98d | 520 | return 0; |
1da177e4 LT |
521 | } |
522 | ||
1da177e4 LT |
523 | /* -------------------------------------------------------------------------- |
524 | Driver Interface | |
525 | -------------------------------------------------------------------------- */ | |
526 | ||
4be44fcd | 527 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 528 | { |
4be44fcd LB |
529 | int result = 0; |
530 | acpi_status status = AE_OK; | |
1da177e4 | 531 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
532 | union acpi_object acpi_object; |
533 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 534 | |
1da177e4 LT |
535 | |
536 | if (!device) | |
d550d98d | 537 | return -EINVAL; |
1da177e4 LT |
538 | |
539 | resource = kmalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); | |
540 | if (!resource) | |
d550d98d | 541 | return -ENOMEM; |
1da177e4 LT |
542 | memset(resource, 0, sizeof(struct acpi_power_resource)); |
543 | ||
544 | resource->handle = device->handle; | |
41598572 | 545 | resource->device = device; |
1da177e4 LT |
546 | strcpy(resource->name, device->pnp.bus_id); |
547 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
548 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
549 | acpi_driver_data(device) = resource; | |
550 | ||
551 | /* Evalute the object to get the system level and resource order. */ | |
552 | status = acpi_evaluate_object(resource->handle, NULL, NULL, &buffer); | |
553 | if (ACPI_FAILURE(status)) { | |
554 | result = -ENODEV; | |
555 | goto end; | |
556 | } | |
557 | resource->system_level = acpi_object.power_resource.system_level; | |
558 | resource->order = acpi_object.power_resource.resource_order; | |
559 | ||
560 | result = acpi_power_get_state(resource); | |
561 | if (result) | |
562 | goto end; | |
563 | ||
564 | switch (resource->state) { | |
565 | case ACPI_POWER_RESOURCE_STATE_ON: | |
566 | device->power.state = ACPI_STATE_D0; | |
567 | break; | |
568 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
569 | device->power.state = ACPI_STATE_D3; | |
570 | break; | |
571 | default: | |
572 | device->power.state = ACPI_STATE_UNKNOWN; | |
573 | break; | |
574 | } | |
575 | ||
576 | result = acpi_power_add_fs(device); | |
577 | if (result) | |
578 | goto end; | |
4be44fcd | 579 | |
1da177e4 | 580 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
4be44fcd | 581 | acpi_device_bid(device), resource->state ? "on" : "off"); |
1da177e4 | 582 | |
4be44fcd | 583 | end: |
1da177e4 LT |
584 | if (result) |
585 | kfree(resource); | |
4be44fcd | 586 | |
d550d98d | 587 | return result; |
1da177e4 LT |
588 | } |
589 | ||
4be44fcd | 590 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
591 | { |
592 | struct acpi_power_resource *resource = NULL; | |
593 | ||
1da177e4 LT |
594 | |
595 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 596 | return -EINVAL; |
1da177e4 | 597 | |
4be44fcd | 598 | resource = (struct acpi_power_resource *)acpi_driver_data(device); |
1da177e4 LT |
599 | |
600 | acpi_power_remove_fs(device); | |
601 | ||
602 | kfree(resource); | |
603 | ||
d550d98d | 604 | return 0; |
1da177e4 LT |
605 | } |
606 | ||
4be44fcd | 607 | static int __init acpi_power_init(void) |
1da177e4 | 608 | { |
4be44fcd | 609 | int result = 0; |
1da177e4 | 610 | |
1da177e4 LT |
611 | |
612 | if (acpi_disabled) | |
d550d98d | 613 | return 0; |
1da177e4 LT |
614 | |
615 | INIT_LIST_HEAD(&acpi_power_resource_list); | |
616 | ||
617 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
618 | if (!acpi_power_dir) | |
d550d98d | 619 | return -ENODEV; |
1da177e4 LT |
620 | |
621 | result = acpi_bus_register_driver(&acpi_power_driver); | |
622 | if (result < 0) { | |
623 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
d550d98d | 624 | return -ENODEV; |
1da177e4 LT |
625 | } |
626 | ||
d550d98d | 627 | return 0; |
1da177e4 LT |
628 | } |
629 | ||
630 | subsys_initcall(acpi_power_init); |