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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 | 72 | struct acpi_power_resource { |
41598572 | 73 | struct acpi_device * device; |
4be44fcd LB |
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 | 82 | |
d7508032 | 83 | static const 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 | 100 | |
1da177e4 LT |
101 | |
102 | if (!resource) | |
d550d98d | 103 | return -ENODEV; |
1da177e4 LT |
104 | |
105 | result = acpi_bus_get_device(handle, &device); | |
106 | if (result) { | |
cece9296 | 107 | printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle); |
d550d98d | 108 | return result; |
1da177e4 LT |
109 | } |
110 | ||
4be44fcd | 111 | *resource = (struct acpi_power_resource *)acpi_driver_data(device); |
1da177e4 | 112 | if (!resource) |
d550d98d | 113 | return -ENODEV; |
1da177e4 | 114 | |
d550d98d | 115 | return 0; |
1da177e4 LT |
116 | } |
117 | ||
4be44fcd | 118 | static int acpi_power_get_state(struct acpi_power_resource *resource) |
1da177e4 | 119 | { |
4be44fcd LB |
120 | acpi_status status = AE_OK; |
121 | unsigned long sta = 0; | |
1da177e4 | 122 | |
1da177e4 LT |
123 | |
124 | if (!resource) | |
d550d98d | 125 | return -EINVAL; |
1da177e4 | 126 | |
5fbc19ef | 127 | status = acpi_evaluate_integer(resource->device->handle, "_STA", NULL, &sta); |
1da177e4 | 128 | if (ACPI_FAILURE(status)) |
d550d98d | 129 | return -ENODEV; |
1da177e4 LT |
130 | |
131 | if (sta & 0x01) | |
132 | resource->state = ACPI_POWER_RESOURCE_STATE_ON; | |
133 | else | |
134 | resource->state = ACPI_POWER_RESOURCE_STATE_OFF; | |
135 | ||
136 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", | |
4be44fcd | 137 | resource->name, resource->state ? "on" : "off")); |
1da177e4 | 138 | |
d550d98d | 139 | return 0; |
1da177e4 LT |
140 | } |
141 | ||
4be44fcd | 142 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 143 | { |
4be44fcd | 144 | int result = 0; |
1da177e4 | 145 | struct acpi_power_resource *resource = NULL; |
4be44fcd | 146 | u32 i = 0; |
1da177e4 | 147 | |
1da177e4 LT |
148 | |
149 | if (!list || !state) | |
d550d98d | 150 | return -EINVAL; |
1da177e4 LT |
151 | |
152 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
153 | ||
4be44fcd | 154 | for (i = 0; i < list->count; i++) { |
1da177e4 LT |
155 | result = acpi_power_get_context(list->handles[i], &resource); |
156 | if (result) | |
d550d98d | 157 | return result; |
1da177e4 LT |
158 | result = acpi_power_get_state(resource); |
159 | if (result) | |
d550d98d | 160 | return result; |
1da177e4 LT |
161 | |
162 | *state = resource->state; | |
163 | ||
164 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
165 | break; | |
166 | } | |
167 | ||
168 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 169 | *state ? "on" : "off")); |
1da177e4 | 170 | |
d550d98d | 171 | return result; |
1da177e4 LT |
172 | } |
173 | ||
4be44fcd | 174 | static int acpi_power_on(acpi_handle handle) |
1da177e4 | 175 | { |
4be44fcd LB |
176 | int result = 0; |
177 | acpi_status status = AE_OK; | |
178 | struct acpi_device *device = NULL; | |
1da177e4 LT |
179 | struct acpi_power_resource *resource = NULL; |
180 | ||
1da177e4 LT |
181 | |
182 | result = acpi_power_get_context(handle, &resource); | |
183 | if (result) | |
d550d98d | 184 | return result; |
1da177e4 LT |
185 | |
186 | resource->references++; | |
187 | ||
4be44fcd LB |
188 | if ((resource->references > 1) |
189 | || (resource->state == ACPI_POWER_RESOURCE_STATE_ON)) { | |
1da177e4 | 190 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n", |
4be44fcd | 191 | resource->name)); |
d550d98d | 192 | return 0; |
1da177e4 LT |
193 | } |
194 | ||
5fbc19ef | 195 | status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL); |
1da177e4 | 196 | if (ACPI_FAILURE(status)) |
d550d98d | 197 | return -ENODEV; |
1da177e4 LT |
198 | |
199 | result = acpi_power_get_state(resource); | |
200 | if (result) | |
d550d98d | 201 | return result; |
1da177e4 | 202 | if (resource->state != ACPI_POWER_RESOURCE_STATE_ON) |
d550d98d | 203 | return -ENOEXEC; |
1da177e4 LT |
204 | |
205 | /* Update the power resource's _device_ power state */ | |
41598572 PM |
206 | device = resource->device; |
207 | resource->device->power.state = ACPI_STATE_D0; | |
1da177e4 LT |
208 | |
209 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 210 | resource->name)); |
1da177e4 | 211 | |
d550d98d | 212 | return 0; |
1da177e4 LT |
213 | } |
214 | ||
4be44fcd | 215 | static int acpi_power_off_device(acpi_handle handle) |
1da177e4 | 216 | { |
4be44fcd LB |
217 | int result = 0; |
218 | acpi_status status = AE_OK; | |
1da177e4 LT |
219 | struct acpi_power_resource *resource = NULL; |
220 | ||
1da177e4 LT |
221 | result = acpi_power_get_context(handle, &resource); |
222 | if (result) | |
d550d98d | 223 | return result; |
1da177e4 LT |
224 | |
225 | if (resource->references) | |
226 | resource->references--; | |
227 | ||
228 | if (resource->references) { | |
4be44fcd LB |
229 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
230 | "Resource [%s] is still in use, dereferencing\n", | |
786f18c6 | 231 | resource->device->pnp.bus_id)); |
d550d98d | 232 | return 0; |
1da177e4 LT |
233 | } |
234 | ||
235 | if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) { | |
236 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n", | |
786f18c6 | 237 | resource->device->pnp.bus_id)); |
d550d98d | 238 | return 0; |
1da177e4 LT |
239 | } |
240 | ||
5fbc19ef | 241 | status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL); |
1da177e4 | 242 | if (ACPI_FAILURE(status)) |
d550d98d | 243 | return -ENODEV; |
1da177e4 LT |
244 | |
245 | result = acpi_power_get_state(resource); | |
246 | if (result) | |
d550d98d | 247 | return result; |
1da177e4 | 248 | if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF) |
d550d98d | 249 | return -ENOEXEC; |
1da177e4 LT |
250 | |
251 | /* Update the power resource's _device_ power state */ | |
786f18c6 | 252 | resource->device->power.state = ACPI_STATE_D3; |
1da177e4 LT |
253 | |
254 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 255 | resource->name)); |
1da177e4 | 256 | |
d550d98d | 257 | return 0; |
1da177e4 LT |
258 | } |
259 | ||
260 | /* | |
261 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
262 | * 1. Power on the power resources required for the wakeup device | |
263 | * 2. Enable _PSW (power state wake) for the device if present | |
264 | */ | |
4be44fcd | 265 | int acpi_enable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 266 | { |
4be44fcd LB |
267 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
268 | struct acpi_object_list arg_list = { 1, &arg }; | |
269 | acpi_status status = AE_OK; | |
270 | int i; | |
271 | int ret = 0; | |
1da177e4 | 272 | |
1da177e4 | 273 | if (!dev || !dev->wakeup.flags.valid) |
d550d98d | 274 | return -1; |
1da177e4 LT |
275 | |
276 | arg.integer.value = 1; | |
277 | /* Open power resource */ | |
278 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
279 | ret = acpi_power_on(dev->wakeup.resources.handles[i]); | |
280 | if (ret) { | |
6468463a | 281 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 282 | dev->wakeup.flags.valid = 0; |
d550d98d | 283 | return -1; |
1da177e4 LT |
284 | } |
285 | } | |
286 | ||
287 | /* Execute PSW */ | |
288 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
289 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
6468463a | 290 | printk(KERN_ERR PREFIX "Evaluate _PSW\n"); |
1da177e4 LT |
291 | dev->wakeup.flags.valid = 0; |
292 | ret = -1; | |
293 | } | |
294 | ||
d550d98d | 295 | return ret; |
1da177e4 LT |
296 | } |
297 | ||
298 | /* | |
299 | * Shutdown a wakeup device, counterpart of above method | |
300 | * 1. Disable _PSW (power state wake) | |
301 | * 2. Shutdown down the power resources | |
302 | */ | |
4be44fcd | 303 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 304 | { |
4be44fcd LB |
305 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
306 | struct acpi_object_list arg_list = { 1, &arg }; | |
307 | acpi_status status = AE_OK; | |
308 | int i; | |
309 | int ret = 0; | |
1da177e4 | 310 | |
1da177e4 LT |
311 | |
312 | if (!dev || !dev->wakeup.flags.valid) | |
d550d98d | 313 | return -1; |
1da177e4 | 314 | |
4be44fcd | 315 | arg.integer.value = 0; |
1da177e4 LT |
316 | /* Execute PSW */ |
317 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
318 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
6468463a | 319 | printk(KERN_ERR PREFIX "Evaluate _PSW\n"); |
1da177e4 | 320 | dev->wakeup.flags.valid = 0; |
d550d98d | 321 | return -1; |
1da177e4 LT |
322 | } |
323 | ||
324 | /* Close power resource */ | |
325 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
326 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i]); | |
327 | if (ret) { | |
6468463a | 328 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 329 | dev->wakeup.flags.valid = 0; |
d550d98d | 330 | return -1; |
1da177e4 LT |
331 | } |
332 | } | |
333 | ||
d550d98d | 334 | return ret; |
1da177e4 LT |
335 | } |
336 | ||
337 | /* -------------------------------------------------------------------------- | |
338 | Device Power Management | |
339 | -------------------------------------------------------------------------- */ | |
340 | ||
4be44fcd | 341 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 342 | { |
4be44fcd LB |
343 | int result = 0; |
344 | struct acpi_handle_list *list = NULL; | |
345 | int list_state = 0; | |
346 | int i = 0; | |
1da177e4 | 347 | |
1da177e4 LT |
348 | |
349 | if (!device) | |
d550d98d | 350 | return -EINVAL; |
1da177e4 LT |
351 | |
352 | device->power.state = ACPI_STATE_UNKNOWN; | |
353 | ||
354 | /* | |
355 | * We know a device's inferred power state when all the resources | |
356 | * required for a given D-state are 'on'. | |
357 | */ | |
4be44fcd | 358 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
359 | list = &device->power.states[i].resources; |
360 | if (list->count < 1) | |
361 | continue; | |
362 | ||
363 | result = acpi_power_get_list_state(list, &list_state); | |
364 | if (result) | |
d550d98d | 365 | return result; |
1da177e4 LT |
366 | |
367 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
368 | device->power.state = i; | |
d550d98d | 369 | return 0; |
1da177e4 LT |
370 | } |
371 | } | |
372 | ||
373 | device->power.state = ACPI_STATE_D3; | |
374 | ||
d550d98d | 375 | return 0; |
1da177e4 LT |
376 | } |
377 | ||
4be44fcd | 378 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 379 | { |
4be44fcd LB |
380 | int result = 0; |
381 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
382 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
383 | int i = 0; | |
1da177e4 | 384 | |
1da177e4 LT |
385 | |
386 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
d550d98d | 387 | return -EINVAL; |
1da177e4 | 388 | |
4be44fcd LB |
389 | if ((device->power.state < ACPI_STATE_D0) |
390 | || (device->power.state > ACPI_STATE_D3)) | |
d550d98d | 391 | return -ENODEV; |
1da177e4 LT |
392 | |
393 | cl = &device->power.states[device->power.state].resources; | |
394 | tl = &device->power.states[state].resources; | |
395 | ||
396 | device->power.state = ACPI_STATE_UNKNOWN; | |
397 | ||
398 | if (!cl->count && !tl->count) { | |
399 | result = -ENODEV; | |
400 | goto end; | |
401 | } | |
402 | ||
403 | /* TBD: Resources must be ordered. */ | |
404 | ||
405 | /* | |
406 | * First we reference all power resources required in the target list | |
407 | * (e.g. so the device doesn't lose power while transitioning). | |
408 | */ | |
4be44fcd | 409 | for (i = 0; i < tl->count; i++) { |
1da177e4 LT |
410 | result = acpi_power_on(tl->handles[i]); |
411 | if (result) | |
412 | goto end; | |
413 | } | |
414 | ||
415 | /* | |
416 | * Then we dereference all power resources used in the current list. | |
417 | */ | |
4be44fcd | 418 | for (i = 0; i < cl->count; i++) { |
1da177e4 LT |
419 | result = acpi_power_off_device(cl->handles[i]); |
420 | if (result) | |
421 | goto end; | |
422 | } | |
423 | ||
424 | /* We shouldn't change the state till all above operations succeed */ | |
425 | device->power.state = state; | |
4be44fcd | 426 | end: |
1da177e4 | 427 | if (result) |
cece9296 LB |
428 | printk(KERN_WARNING PREFIX "Transitioning device [%s] to D%d\n", |
429 | device->pnp.bus_id, state); | |
1da177e4 | 430 | |
d550d98d | 431 | return result; |
1da177e4 LT |
432 | } |
433 | ||
1da177e4 LT |
434 | /* -------------------------------------------------------------------------- |
435 | FS Interface (/proc) | |
436 | -------------------------------------------------------------------------- */ | |
437 | ||
4be44fcd | 438 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
439 | |
440 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
441 | { | |
442 | struct acpi_power_resource *resource = NULL; | |
443 | ||
1da177e4 LT |
444 | |
445 | resource = (struct acpi_power_resource *)seq->private; | |
446 | ||
447 | if (!resource) | |
448 | goto end; | |
449 | ||
450 | seq_puts(seq, "state: "); | |
451 | switch (resource->state) { | |
452 | case ACPI_POWER_RESOURCE_STATE_ON: | |
453 | seq_puts(seq, "on\n"); | |
454 | break; | |
455 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
456 | seq_puts(seq, "off\n"); | |
457 | break; | |
458 | default: | |
459 | seq_puts(seq, "unknown\n"); | |
460 | break; | |
461 | } | |
462 | ||
463 | seq_printf(seq, "system level: S%d\n" | |
4be44fcd LB |
464 | "order: %d\n" |
465 | "reference count: %d\n", | |
466 | resource->system_level, | |
467 | resource->order, resource->references); | |
1da177e4 | 468 | |
4be44fcd | 469 | end: |
d550d98d | 470 | return 0; |
1da177e4 LT |
471 | } |
472 | ||
473 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
474 | { | |
475 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
476 | } | |
477 | ||
4be44fcd | 478 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 479 | { |
4be44fcd | 480 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 481 | |
1da177e4 LT |
482 | |
483 | if (!device) | |
d550d98d | 484 | return -EINVAL; |
1da177e4 LT |
485 | |
486 | if (!acpi_device_dir(device)) { | |
487 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 488 | acpi_power_dir); |
1da177e4 | 489 | if (!acpi_device_dir(device)) |
d550d98d | 490 | return -ENODEV; |
1da177e4 LT |
491 | } |
492 | ||
493 | /* 'status' [R] */ | |
494 | entry = create_proc_entry(ACPI_POWER_FILE_STATUS, | |
4be44fcd | 495 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 | 496 | if (!entry) |
d550d98d | 497 | return -EIO; |
1da177e4 LT |
498 | else { |
499 | entry->proc_fops = &acpi_power_fops; | |
500 | entry->data = acpi_driver_data(device); | |
501 | } | |
502 | ||
d550d98d | 503 | return 0; |
1da177e4 LT |
504 | } |
505 | ||
4be44fcd | 506 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 | 507 | { |
1da177e4 LT |
508 | |
509 | if (acpi_device_dir(device)) { | |
510 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
511 | acpi_device_dir(device)); | |
512 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
513 | acpi_device_dir(device) = NULL; | |
514 | } | |
515 | ||
d550d98d | 516 | return 0; |
1da177e4 LT |
517 | } |
518 | ||
1da177e4 LT |
519 | /* -------------------------------------------------------------------------- |
520 | Driver Interface | |
521 | -------------------------------------------------------------------------- */ | |
522 | ||
4be44fcd | 523 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 524 | { |
4be44fcd LB |
525 | int result = 0; |
526 | acpi_status status = AE_OK; | |
1da177e4 | 527 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
528 | union acpi_object acpi_object; |
529 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 530 | |
1da177e4 LT |
531 | |
532 | if (!device) | |
d550d98d | 533 | return -EINVAL; |
1da177e4 LT |
534 | |
535 | resource = kmalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); | |
536 | if (!resource) | |
d550d98d | 537 | return -ENOMEM; |
1da177e4 LT |
538 | memset(resource, 0, sizeof(struct acpi_power_resource)); |
539 | ||
41598572 | 540 | resource->device = device; |
1da177e4 LT |
541 | strcpy(resource->name, device->pnp.bus_id); |
542 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
543 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
544 | acpi_driver_data(device) = resource; | |
545 | ||
546 | /* Evalute the object to get the system level and resource order. */ | |
5fbc19ef | 547 | status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer); |
1da177e4 LT |
548 | if (ACPI_FAILURE(status)) { |
549 | result = -ENODEV; | |
550 | goto end; | |
551 | } | |
552 | resource->system_level = acpi_object.power_resource.system_level; | |
553 | resource->order = acpi_object.power_resource.resource_order; | |
554 | ||
555 | result = acpi_power_get_state(resource); | |
556 | if (result) | |
557 | goto end; | |
558 | ||
559 | switch (resource->state) { | |
560 | case ACPI_POWER_RESOURCE_STATE_ON: | |
561 | device->power.state = ACPI_STATE_D0; | |
562 | break; | |
563 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
564 | device->power.state = ACPI_STATE_D3; | |
565 | break; | |
566 | default: | |
567 | device->power.state = ACPI_STATE_UNKNOWN; | |
568 | break; | |
569 | } | |
570 | ||
571 | result = acpi_power_add_fs(device); | |
572 | if (result) | |
573 | goto end; | |
4be44fcd | 574 | |
1da177e4 | 575 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
4be44fcd | 576 | acpi_device_bid(device), resource->state ? "on" : "off"); |
1da177e4 | 577 | |
4be44fcd | 578 | end: |
1da177e4 LT |
579 | if (result) |
580 | kfree(resource); | |
4be44fcd | 581 | |
d550d98d | 582 | return result; |
1da177e4 LT |
583 | } |
584 | ||
4be44fcd | 585 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
586 | { |
587 | struct acpi_power_resource *resource = NULL; | |
588 | ||
1da177e4 LT |
589 | |
590 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 591 | return -EINVAL; |
1da177e4 | 592 | |
4be44fcd | 593 | resource = (struct acpi_power_resource *)acpi_driver_data(device); |
1da177e4 LT |
594 | |
595 | acpi_power_remove_fs(device); | |
596 | ||
597 | kfree(resource); | |
598 | ||
d550d98d | 599 | return 0; |
1da177e4 LT |
600 | } |
601 | ||
4be44fcd | 602 | static int __init acpi_power_init(void) |
1da177e4 | 603 | { |
4be44fcd | 604 | int result = 0; |
1da177e4 | 605 | |
1da177e4 LT |
606 | |
607 | if (acpi_disabled) | |
d550d98d | 608 | return 0; |
1da177e4 LT |
609 | |
610 | INIT_LIST_HEAD(&acpi_power_resource_list); | |
611 | ||
612 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
613 | if (!acpi_power_dir) | |
d550d98d | 614 | return -ENODEV; |
1da177e4 LT |
615 | |
616 | result = acpi_bus_register_driver(&acpi_power_driver); | |
617 | if (result < 0) { | |
618 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
d550d98d | 619 | return -ENODEV; |
1da177e4 LT |
620 | } |
621 | ||
d550d98d | 622 | return 0; |
1da177e4 LT |
623 | } |
624 | ||
625 | subsys_initcall(acpi_power_init); |