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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 |
f52fd66d | 48 | ACPI_MODULE_NAME("power"); |
1da177e4 LT |
49 | #define ACPI_POWER_COMPONENT 0x00800000 |
50 | #define ACPI_POWER_CLASS "power_resource" | |
1da177e4 LT |
51 | #define ACPI_POWER_DEVICE_NAME "Power Resource" |
52 | #define ACPI_POWER_FILE_INFO "info" | |
53 | #define ACPI_POWER_FILE_STATUS "state" | |
54 | #define ACPI_POWER_RESOURCE_STATE_OFF 0x00 | |
55 | #define ACPI_POWER_RESOURCE_STATE_ON 0x01 | |
56 | #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF | |
4be44fcd LB |
57 | static int acpi_power_add(struct acpi_device *device); |
58 | static int acpi_power_remove(struct acpi_device *device, int type); | |
e8363f33 | 59 | static int acpi_power_resume(struct acpi_device *device); |
1da177e4 LT |
60 | static int acpi_power_open_fs(struct inode *inode, struct file *file); |
61 | ||
1ba90e3a TR |
62 | static struct acpi_device_id power_device_ids[] = { |
63 | {ACPI_POWER_HID, 0}, | |
64 | {"", 0}, | |
65 | }; | |
66 | MODULE_DEVICE_TABLE(acpi, power_device_ids); | |
67 | ||
1da177e4 | 68 | static struct acpi_driver acpi_power_driver = { |
c2b6705b | 69 | .name = "power", |
4be44fcd | 70 | .class = ACPI_POWER_CLASS, |
1ba90e3a | 71 | .ids = power_device_ids, |
4be44fcd LB |
72 | .ops = { |
73 | .add = acpi_power_add, | |
74 | .remove = acpi_power_remove, | |
0a613902 | 75 | .resume = acpi_power_resume, |
4be44fcd | 76 | }, |
1da177e4 LT |
77 | }; |
78 | ||
0a613902 KK |
79 | struct acpi_power_reference { |
80 | struct list_head node; | |
81 | struct acpi_device *device; | |
82 | }; | |
83 | ||
4be44fcd | 84 | struct acpi_power_resource { |
41598572 | 85 | struct acpi_device * device; |
4be44fcd LB |
86 | acpi_bus_id name; |
87 | u32 system_level; | |
88 | u32 order; | |
0a613902 KK |
89 | struct mutex resource_lock; |
90 | struct list_head reference; | |
1da177e4 LT |
91 | }; |
92 | ||
4be44fcd | 93 | static struct list_head acpi_power_resource_list; |
1da177e4 | 94 | |
d7508032 | 95 | static const struct file_operations acpi_power_fops = { |
4be44fcd LB |
96 | .open = acpi_power_open_fs, |
97 | .read = seq_read, | |
98 | .llseek = seq_lseek, | |
99 | .release = single_release, | |
1da177e4 LT |
100 | }; |
101 | ||
102 | /* -------------------------------------------------------------------------- | |
103 | Power Resource Management | |
104 | -------------------------------------------------------------------------- */ | |
105 | ||
106 | static int | |
4be44fcd LB |
107 | acpi_power_get_context(acpi_handle handle, |
108 | struct acpi_power_resource **resource) | |
1da177e4 | 109 | { |
4be44fcd LB |
110 | int result = 0; |
111 | struct acpi_device *device = NULL; | |
1da177e4 | 112 | |
1da177e4 LT |
113 | |
114 | if (!resource) | |
d550d98d | 115 | return -ENODEV; |
1da177e4 LT |
116 | |
117 | result = acpi_bus_get_device(handle, &device); | |
118 | if (result) { | |
cece9296 | 119 | printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle); |
d550d98d | 120 | return result; |
1da177e4 LT |
121 | } |
122 | ||
50dd0969 | 123 | *resource = acpi_driver_data(device); |
1da177e4 | 124 | if (!resource) |
d550d98d | 125 | return -ENODEV; |
1da177e4 | 126 | |
d550d98d | 127 | return 0; |
1da177e4 LT |
128 | } |
129 | ||
c35923bc | 130 | static int acpi_power_get_state(struct acpi_power_resource *resource, int *state) |
1da177e4 | 131 | { |
4be44fcd LB |
132 | acpi_status status = AE_OK; |
133 | unsigned long sta = 0; | |
1da177e4 | 134 | |
1da177e4 | 135 | |
c35923bc | 136 | if (!resource || !state) |
d550d98d | 137 | return -EINVAL; |
1da177e4 | 138 | |
5fbc19ef | 139 | status = acpi_evaluate_integer(resource->device->handle, "_STA", NULL, &sta); |
1da177e4 | 140 | if (ACPI_FAILURE(status)) |
d550d98d | 141 | return -ENODEV; |
1da177e4 | 142 | |
c35923bc AS |
143 | *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON: |
144 | ACPI_POWER_RESOURCE_STATE_OFF; | |
1da177e4 LT |
145 | |
146 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", | |
c35923bc | 147 | resource->name, state ? "on" : "off")); |
1da177e4 | 148 | |
d550d98d | 149 | return 0; |
1da177e4 LT |
150 | } |
151 | ||
4be44fcd | 152 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 153 | { |
c35923bc | 154 | int result = 0, state1; |
1da177e4 | 155 | struct acpi_power_resource *resource = NULL; |
4be44fcd | 156 | u32 i = 0; |
1da177e4 | 157 | |
1da177e4 LT |
158 | |
159 | if (!list || !state) | |
d550d98d | 160 | return -EINVAL; |
1da177e4 LT |
161 | |
162 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
163 | ||
4be44fcd | 164 | for (i = 0; i < list->count; i++) { |
1da177e4 LT |
165 | result = acpi_power_get_context(list->handles[i], &resource); |
166 | if (result) | |
d550d98d | 167 | return result; |
c35923bc | 168 | result = acpi_power_get_state(resource, &state1); |
1da177e4 | 169 | if (result) |
d550d98d | 170 | return result; |
1da177e4 | 171 | |
c35923bc | 172 | *state = state1; |
1da177e4 LT |
173 | |
174 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
175 | break; | |
176 | } | |
177 | ||
178 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 179 | *state ? "on" : "off")); |
1da177e4 | 180 | |
d550d98d | 181 | return result; |
1da177e4 LT |
182 | } |
183 | ||
0a613902 | 184 | static int acpi_power_on(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 185 | { |
c35923bc | 186 | int result = 0, state; |
0a613902 | 187 | int found = 0; |
4be44fcd | 188 | acpi_status status = AE_OK; |
1da177e4 | 189 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
190 | struct list_head *node, *next; |
191 | struct acpi_power_reference *ref; | |
1da177e4 | 192 | |
1da177e4 LT |
193 | |
194 | result = acpi_power_get_context(handle, &resource); | |
195 | if (result) | |
d550d98d | 196 | return result; |
1da177e4 | 197 | |
0a613902 KK |
198 | mutex_lock(&resource->resource_lock); |
199 | list_for_each_safe(node, next, &resource->reference) { | |
200 | ref = container_of(node, struct acpi_power_reference, node); | |
201 | if (dev->handle == ref->device->handle) { | |
202 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n", | |
203 | dev->pnp.bus_id, resource->name)); | |
204 | found = 1; | |
205 | break; | |
206 | } | |
207 | } | |
208 | ||
209 | if (!found) { | |
210 | ref = kmalloc(sizeof (struct acpi_power_reference), | |
211 | irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL); | |
212 | if (!ref) { | |
213 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n")); | |
214 | mutex_unlock(&resource->resource_lock); | |
215 | return -ENOMEM; | |
216 | } | |
217 | list_add_tail(&ref->node, &resource->reference); | |
218 | ref->device = dev; | |
219 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n", | |
220 | dev->pnp.bus_id, resource->name)); | |
221 | } | |
222 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 223 | |
5fbc19ef | 224 | status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL); |
1da177e4 | 225 | if (ACPI_FAILURE(status)) |
d550d98d | 226 | return -ENODEV; |
1da177e4 | 227 | |
c35923bc | 228 | result = acpi_power_get_state(resource, &state); |
1da177e4 | 229 | if (result) |
d550d98d | 230 | return result; |
c35923bc | 231 | if (state != ACPI_POWER_RESOURCE_STATE_ON) |
d550d98d | 232 | return -ENOEXEC; |
1da177e4 LT |
233 | |
234 | /* Update the power resource's _device_ power state */ | |
41598572 | 235 | resource->device->power.state = ACPI_STATE_D0; |
1da177e4 LT |
236 | |
237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 238 | resource->name)); |
d550d98d | 239 | return 0; |
1da177e4 LT |
240 | } |
241 | ||
0a613902 | 242 | static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 243 | { |
c35923bc | 244 | int result = 0, state; |
4be44fcd | 245 | acpi_status status = AE_OK; |
1da177e4 | 246 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
247 | struct list_head *node, *next; |
248 | struct acpi_power_reference *ref; | |
249 | ||
1da177e4 | 250 | |
1da177e4 LT |
251 | result = acpi_power_get_context(handle, &resource); |
252 | if (result) | |
d550d98d | 253 | return result; |
1da177e4 | 254 | |
0a613902 KK |
255 | mutex_lock(&resource->resource_lock); |
256 | list_for_each_safe(node, next, &resource->reference) { | |
257 | ref = container_of(node, struct acpi_power_reference, node); | |
258 | if (dev->handle == ref->device->handle) { | |
259 | list_del(&ref->node); | |
260 | kfree(ref); | |
261 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n", | |
262 | dev->pnp.bus_id, resource->name)); | |
263 | break; | |
264 | } | |
265 | } | |
1da177e4 | 266 | |
0a613902 KK |
267 | if (!list_empty(&resource->reference)) { |
268 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n", | |
269 | resource->name)); | |
270 | mutex_unlock(&resource->resource_lock); | |
d550d98d | 271 | return 0; |
1da177e4 | 272 | } |
0a613902 | 273 | mutex_unlock(&resource->resource_lock); |
1da177e4 | 274 | |
5fbc19ef | 275 | status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL); |
1da177e4 | 276 | if (ACPI_FAILURE(status)) |
d550d98d | 277 | return -ENODEV; |
1da177e4 | 278 | |
c35923bc | 279 | result = acpi_power_get_state(resource, &state); |
1da177e4 | 280 | if (result) |
d550d98d | 281 | return result; |
c35923bc | 282 | if (state != ACPI_POWER_RESOURCE_STATE_OFF) |
d550d98d | 283 | return -ENOEXEC; |
1da177e4 LT |
284 | |
285 | /* Update the power resource's _device_ power state */ | |
786f18c6 | 286 | resource->device->power.state = ACPI_STATE_D3; |
1da177e4 LT |
287 | |
288 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 289 | resource->name)); |
1da177e4 | 290 | |
d550d98d | 291 | return 0; |
1da177e4 LT |
292 | } |
293 | ||
294 | /* | |
295 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
296 | * 1. Power on the power resources required for the wakeup device | |
297 | * 2. Enable _PSW (power state wake) for the device if present | |
298 | */ | |
4be44fcd | 299 | int acpi_enable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 300 | { |
4be44fcd LB |
301 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
302 | struct acpi_object_list arg_list = { 1, &arg }; | |
303 | acpi_status status = AE_OK; | |
304 | int i; | |
305 | int ret = 0; | |
1da177e4 | 306 | |
1da177e4 | 307 | if (!dev || !dev->wakeup.flags.valid) |
d550d98d | 308 | return -1; |
1da177e4 LT |
309 | |
310 | arg.integer.value = 1; | |
311 | /* Open power resource */ | |
312 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
0a613902 | 313 | ret = acpi_power_on(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 314 | if (ret) { |
6468463a | 315 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 316 | dev->wakeup.flags.valid = 0; |
d550d98d | 317 | return -1; |
1da177e4 LT |
318 | } |
319 | } | |
320 | ||
321 | /* Execute PSW */ | |
322 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
323 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
6468463a | 324 | printk(KERN_ERR PREFIX "Evaluate _PSW\n"); |
1da177e4 LT |
325 | dev->wakeup.flags.valid = 0; |
326 | ret = -1; | |
327 | } | |
328 | ||
d550d98d | 329 | return ret; |
1da177e4 LT |
330 | } |
331 | ||
332 | /* | |
333 | * Shutdown a wakeup device, counterpart of above method | |
334 | * 1. Disable _PSW (power state wake) | |
335 | * 2. Shutdown down the power resources | |
336 | */ | |
4be44fcd | 337 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 338 | { |
4be44fcd LB |
339 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
340 | struct acpi_object_list arg_list = { 1, &arg }; | |
341 | acpi_status status = AE_OK; | |
342 | int i; | |
343 | int ret = 0; | |
1da177e4 | 344 | |
1da177e4 LT |
345 | |
346 | if (!dev || !dev->wakeup.flags.valid) | |
d550d98d | 347 | return -1; |
1da177e4 | 348 | |
4be44fcd | 349 | arg.integer.value = 0; |
1da177e4 LT |
350 | /* Execute PSW */ |
351 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
352 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
6468463a | 353 | printk(KERN_ERR PREFIX "Evaluate _PSW\n"); |
1da177e4 | 354 | dev->wakeup.flags.valid = 0; |
d550d98d | 355 | return -1; |
1da177e4 LT |
356 | } |
357 | ||
358 | /* Close power resource */ | |
359 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
0a613902 | 360 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 361 | if (ret) { |
6468463a | 362 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 363 | dev->wakeup.flags.valid = 0; |
d550d98d | 364 | return -1; |
1da177e4 LT |
365 | } |
366 | } | |
367 | ||
d550d98d | 368 | return ret; |
1da177e4 LT |
369 | } |
370 | ||
371 | /* -------------------------------------------------------------------------- | |
372 | Device Power Management | |
373 | -------------------------------------------------------------------------- */ | |
374 | ||
4be44fcd | 375 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 376 | { |
4be44fcd LB |
377 | int result = 0; |
378 | struct acpi_handle_list *list = NULL; | |
379 | int list_state = 0; | |
380 | int i = 0; | |
1da177e4 | 381 | |
1da177e4 LT |
382 | |
383 | if (!device) | |
d550d98d | 384 | return -EINVAL; |
1da177e4 LT |
385 | |
386 | device->power.state = ACPI_STATE_UNKNOWN; | |
387 | ||
388 | /* | |
389 | * We know a device's inferred power state when all the resources | |
390 | * required for a given D-state are 'on'. | |
391 | */ | |
4be44fcd | 392 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
393 | list = &device->power.states[i].resources; |
394 | if (list->count < 1) | |
395 | continue; | |
396 | ||
397 | result = acpi_power_get_list_state(list, &list_state); | |
398 | if (result) | |
d550d98d | 399 | return result; |
1da177e4 LT |
400 | |
401 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
402 | device->power.state = i; | |
d550d98d | 403 | return 0; |
1da177e4 LT |
404 | } |
405 | } | |
406 | ||
407 | device->power.state = ACPI_STATE_D3; | |
408 | ||
d550d98d | 409 | return 0; |
1da177e4 LT |
410 | } |
411 | ||
4be44fcd | 412 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 413 | { |
4be44fcd LB |
414 | int result = 0; |
415 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
416 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
417 | int i = 0; | |
1da177e4 | 418 | |
1da177e4 LT |
419 | |
420 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
d550d98d | 421 | return -EINVAL; |
1da177e4 | 422 | |
4be44fcd LB |
423 | if ((device->power.state < ACPI_STATE_D0) |
424 | || (device->power.state > ACPI_STATE_D3)) | |
d550d98d | 425 | return -ENODEV; |
1da177e4 LT |
426 | |
427 | cl = &device->power.states[device->power.state].resources; | |
428 | tl = &device->power.states[state].resources; | |
429 | ||
1da177e4 LT |
430 | if (!cl->count && !tl->count) { |
431 | result = -ENODEV; | |
432 | goto end; | |
433 | } | |
434 | ||
435 | /* TBD: Resources must be ordered. */ | |
436 | ||
437 | /* | |
438 | * First we reference all power resources required in the target list | |
439 | * (e.g. so the device doesn't lose power while transitioning). | |
440 | */ | |
4be44fcd | 441 | for (i = 0; i < tl->count; i++) { |
0a613902 | 442 | result = acpi_power_on(tl->handles[i], device); |
1da177e4 LT |
443 | if (result) |
444 | goto end; | |
445 | } | |
446 | ||
b1028c54 KK |
447 | if (device->power.state == state) { |
448 | goto end; | |
449 | } | |
450 | ||
1da177e4 LT |
451 | /* |
452 | * Then we dereference all power resources used in the current list. | |
453 | */ | |
4be44fcd | 454 | for (i = 0; i < cl->count; i++) { |
0a613902 | 455 | result = acpi_power_off_device(cl->handles[i], device); |
1da177e4 LT |
456 | if (result) |
457 | goto end; | |
458 | } | |
459 | ||
72925760 KK |
460 | end: |
461 | if (result) { | |
462 | device->power.state = ACPI_STATE_UNKNOWN; | |
cece9296 LB |
463 | printk(KERN_WARNING PREFIX "Transitioning device [%s] to D%d\n", |
464 | device->pnp.bus_id, state); | |
72925760 KK |
465 | } else { |
466 | /* We shouldn't change the state till all above operations succeed */ | |
467 | device->power.state = state; | |
468 | } | |
1da177e4 | 469 | |
d550d98d | 470 | return result; |
1da177e4 LT |
471 | } |
472 | ||
1da177e4 LT |
473 | /* -------------------------------------------------------------------------- |
474 | FS Interface (/proc) | |
475 | -------------------------------------------------------------------------- */ | |
476 | ||
4be44fcd | 477 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
478 | |
479 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
480 | { | |
0a613902 | 481 | int count = 0; |
c35923bc | 482 | int result = 0, state; |
1da177e4 | 483 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
484 | struct list_head *node, *next; |
485 | struct acpi_power_reference *ref; | |
1da177e4 | 486 | |
1da177e4 | 487 | |
50dd0969 | 488 | resource = seq->private; |
1da177e4 LT |
489 | |
490 | if (!resource) | |
491 | goto end; | |
492 | ||
c35923bc | 493 | result = acpi_power_get_state(resource, &state); |
0a613902 KK |
494 | if (result) |
495 | goto end; | |
496 | ||
1da177e4 | 497 | seq_puts(seq, "state: "); |
c35923bc | 498 | switch (state) { |
1da177e4 LT |
499 | case ACPI_POWER_RESOURCE_STATE_ON: |
500 | seq_puts(seq, "on\n"); | |
501 | break; | |
502 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
503 | seq_puts(seq, "off\n"); | |
504 | break; | |
505 | default: | |
506 | seq_puts(seq, "unknown\n"); | |
507 | break; | |
508 | } | |
509 | ||
0a613902 KK |
510 | mutex_lock(&resource->resource_lock); |
511 | list_for_each_safe(node, next, &resource->reference) { | |
512 | ref = container_of(node, struct acpi_power_reference, node); | |
513 | count++; | |
514 | } | |
515 | mutex_unlock(&resource->resource_lock); | |
516 | ||
1da177e4 | 517 | seq_printf(seq, "system level: S%d\n" |
4be44fcd LB |
518 | "order: %d\n" |
519 | "reference count: %d\n", | |
520 | resource->system_level, | |
0a613902 | 521 | resource->order, count); |
1da177e4 | 522 | |
4be44fcd | 523 | end: |
d550d98d | 524 | return 0; |
1da177e4 LT |
525 | } |
526 | ||
527 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
528 | { | |
529 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
530 | } | |
531 | ||
4be44fcd | 532 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 533 | { |
4be44fcd | 534 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 535 | |
1da177e4 LT |
536 | |
537 | if (!device) | |
d550d98d | 538 | return -EINVAL; |
1da177e4 LT |
539 | |
540 | if (!acpi_device_dir(device)) { | |
541 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 542 | acpi_power_dir); |
1da177e4 | 543 | if (!acpi_device_dir(device)) |
d550d98d | 544 | return -ENODEV; |
1da177e4 LT |
545 | } |
546 | ||
547 | /* 'status' [R] */ | |
548 | entry = create_proc_entry(ACPI_POWER_FILE_STATUS, | |
4be44fcd | 549 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 | 550 | if (!entry) |
d550d98d | 551 | return -EIO; |
1da177e4 LT |
552 | else { |
553 | entry->proc_fops = &acpi_power_fops; | |
554 | entry->data = acpi_driver_data(device); | |
555 | } | |
556 | ||
d550d98d | 557 | return 0; |
1da177e4 LT |
558 | } |
559 | ||
4be44fcd | 560 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 | 561 | { |
1da177e4 LT |
562 | |
563 | if (acpi_device_dir(device)) { | |
564 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
565 | acpi_device_dir(device)); | |
566 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
567 | acpi_device_dir(device) = NULL; | |
568 | } | |
569 | ||
d550d98d | 570 | return 0; |
1da177e4 LT |
571 | } |
572 | ||
1da177e4 LT |
573 | /* -------------------------------------------------------------------------- |
574 | Driver Interface | |
575 | -------------------------------------------------------------------------- */ | |
576 | ||
4be44fcd | 577 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 578 | { |
c35923bc | 579 | int result = 0, state; |
4be44fcd | 580 | acpi_status status = AE_OK; |
1da177e4 | 581 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
582 | union acpi_object acpi_object; |
583 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 584 | |
1da177e4 LT |
585 | |
586 | if (!device) | |
d550d98d | 587 | return -EINVAL; |
1da177e4 | 588 | |
36bcbec7 | 589 | resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); |
1da177e4 | 590 | if (!resource) |
d550d98d | 591 | return -ENOMEM; |
1da177e4 | 592 | |
41598572 | 593 | resource->device = device; |
0a613902 KK |
594 | mutex_init(&resource->resource_lock); |
595 | INIT_LIST_HEAD(&resource->reference); | |
1da177e4 LT |
596 | strcpy(resource->name, device->pnp.bus_id); |
597 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
598 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
599 | acpi_driver_data(device) = resource; | |
600 | ||
601 | /* Evalute the object to get the system level and resource order. */ | |
5fbc19ef | 602 | status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer); |
1da177e4 LT |
603 | if (ACPI_FAILURE(status)) { |
604 | result = -ENODEV; | |
605 | goto end; | |
606 | } | |
607 | resource->system_level = acpi_object.power_resource.system_level; | |
608 | resource->order = acpi_object.power_resource.resource_order; | |
609 | ||
c35923bc | 610 | result = acpi_power_get_state(resource, &state); |
1da177e4 LT |
611 | if (result) |
612 | goto end; | |
613 | ||
c35923bc | 614 | switch (state) { |
1da177e4 LT |
615 | case ACPI_POWER_RESOURCE_STATE_ON: |
616 | device->power.state = ACPI_STATE_D0; | |
617 | break; | |
618 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
619 | device->power.state = ACPI_STATE_D3; | |
620 | break; | |
621 | default: | |
622 | device->power.state = ACPI_STATE_UNKNOWN; | |
623 | break; | |
624 | } | |
625 | ||
626 | result = acpi_power_add_fs(device); | |
627 | if (result) | |
628 | goto end; | |
4be44fcd | 629 | |
1da177e4 | 630 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
c35923bc | 631 | acpi_device_bid(device), state ? "on" : "off"); |
1da177e4 | 632 | |
4be44fcd | 633 | end: |
1da177e4 LT |
634 | if (result) |
635 | kfree(resource); | |
4be44fcd | 636 | |
d550d98d | 637 | return result; |
1da177e4 LT |
638 | } |
639 | ||
4be44fcd | 640 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
641 | { |
642 | struct acpi_power_resource *resource = NULL; | |
0a613902 | 643 | struct list_head *node, *next; |
1da177e4 | 644 | |
1da177e4 LT |
645 | |
646 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 647 | return -EINVAL; |
1da177e4 | 648 | |
50dd0969 | 649 | resource = acpi_driver_data(device); |
1da177e4 LT |
650 | |
651 | acpi_power_remove_fs(device); | |
652 | ||
0a613902 KK |
653 | mutex_lock(&resource->resource_lock); |
654 | list_for_each_safe(node, next, &resource->reference) { | |
655 | struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node); | |
656 | list_del(&ref->node); | |
657 | kfree(ref); | |
658 | } | |
659 | mutex_unlock(&resource->resource_lock); | |
660 | ||
1da177e4 LT |
661 | kfree(resource); |
662 | ||
d550d98d | 663 | return 0; |
1da177e4 LT |
664 | } |
665 | ||
e8363f33 | 666 | static int acpi_power_resume(struct acpi_device *device) |
0a613902 | 667 | { |
c35923bc | 668 | int result = 0, state; |
0a613902 KK |
669 | struct acpi_power_resource *resource = NULL; |
670 | struct acpi_power_reference *ref; | |
671 | ||
672 | if (!device || !acpi_driver_data(device)) | |
673 | return -EINVAL; | |
674 | ||
675 | resource = (struct acpi_power_resource *)acpi_driver_data(device); | |
676 | ||
c35923bc | 677 | result = acpi_power_get_state(resource, &state); |
0a613902 KK |
678 | if (result) |
679 | return result; | |
680 | ||
681 | mutex_lock(&resource->resource_lock); | |
c35923bc | 682 | if (state == ACPI_POWER_RESOURCE_STATE_OFF && |
0a613902 KK |
683 | !list_empty(&resource->reference)) { |
684 | ref = container_of(resource->reference.next, struct acpi_power_reference, node); | |
685 | mutex_unlock(&resource->resource_lock); | |
686 | result = acpi_power_on(device->handle, ref->device); | |
687 | return result; | |
688 | } | |
689 | ||
690 | mutex_unlock(&resource->resource_lock); | |
691 | return 0; | |
692 | } | |
693 | ||
4be44fcd | 694 | static int __init acpi_power_init(void) |
1da177e4 | 695 | { |
4be44fcd | 696 | int result = 0; |
1da177e4 | 697 | |
1da177e4 LT |
698 | |
699 | if (acpi_disabled) | |
d550d98d | 700 | return 0; |
1da177e4 LT |
701 | |
702 | INIT_LIST_HEAD(&acpi_power_resource_list); | |
703 | ||
704 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
705 | if (!acpi_power_dir) | |
d550d98d | 706 | return -ENODEV; |
1da177e4 LT |
707 | |
708 | result = acpi_bus_register_driver(&acpi_power_driver); | |
709 | if (result < 0) { | |
710 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
d550d98d | 711 | return -ENODEV; |
1da177e4 LT |
712 | } |
713 | ||
d550d98d | 714 | return 0; |
1da177e4 LT |
715 | } |
716 | ||
717 | subsys_initcall(acpi_power_init); |