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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 | ||
62 | static struct acpi_driver acpi_power_driver = { | |
c2b6705b | 63 | .name = "power", |
4be44fcd LB |
64 | .class = ACPI_POWER_CLASS, |
65 | .ids = ACPI_POWER_HID, | |
66 | .ops = { | |
67 | .add = acpi_power_add, | |
68 | .remove = acpi_power_remove, | |
0a613902 | 69 | .resume = acpi_power_resume, |
4be44fcd | 70 | }, |
1da177e4 LT |
71 | }; |
72 | ||
0a613902 KK |
73 | struct acpi_power_reference { |
74 | struct list_head node; | |
75 | struct acpi_device *device; | |
76 | }; | |
77 | ||
4be44fcd | 78 | struct acpi_power_resource { |
41598572 | 79 | struct acpi_device * device; |
4be44fcd LB |
80 | acpi_bus_id name; |
81 | u32 system_level; | |
82 | u32 order; | |
83 | int state; | |
0a613902 KK |
84 | struct mutex resource_lock; |
85 | struct list_head reference; | |
1da177e4 LT |
86 | }; |
87 | ||
4be44fcd | 88 | static struct list_head acpi_power_resource_list; |
1da177e4 | 89 | |
d7508032 | 90 | static const struct file_operations acpi_power_fops = { |
4be44fcd LB |
91 | .open = acpi_power_open_fs, |
92 | .read = seq_read, | |
93 | .llseek = seq_lseek, | |
94 | .release = single_release, | |
1da177e4 LT |
95 | }; |
96 | ||
97 | /* -------------------------------------------------------------------------- | |
98 | Power Resource Management | |
99 | -------------------------------------------------------------------------- */ | |
100 | ||
101 | static int | |
4be44fcd LB |
102 | acpi_power_get_context(acpi_handle handle, |
103 | struct acpi_power_resource **resource) | |
1da177e4 | 104 | { |
4be44fcd LB |
105 | int result = 0; |
106 | struct acpi_device *device = NULL; | |
1da177e4 | 107 | |
1da177e4 LT |
108 | |
109 | if (!resource) | |
d550d98d | 110 | return -ENODEV; |
1da177e4 LT |
111 | |
112 | result = acpi_bus_get_device(handle, &device); | |
113 | if (result) { | |
cece9296 | 114 | printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle); |
d550d98d | 115 | return result; |
1da177e4 LT |
116 | } |
117 | ||
50dd0969 | 118 | *resource = acpi_driver_data(device); |
1da177e4 | 119 | if (!resource) |
d550d98d | 120 | return -ENODEV; |
1da177e4 | 121 | |
d550d98d | 122 | return 0; |
1da177e4 LT |
123 | } |
124 | ||
4be44fcd | 125 | static int acpi_power_get_state(struct acpi_power_resource *resource) |
1da177e4 | 126 | { |
4be44fcd LB |
127 | acpi_status status = AE_OK; |
128 | unsigned long sta = 0; | |
1da177e4 | 129 | |
1da177e4 LT |
130 | |
131 | if (!resource) | |
d550d98d | 132 | return -EINVAL; |
1da177e4 | 133 | |
5fbc19ef | 134 | status = acpi_evaluate_integer(resource->device->handle, "_STA", NULL, &sta); |
1da177e4 | 135 | if (ACPI_FAILURE(status)) |
d550d98d | 136 | return -ENODEV; |
1da177e4 LT |
137 | |
138 | if (sta & 0x01) | |
139 | resource->state = ACPI_POWER_RESOURCE_STATE_ON; | |
140 | else | |
141 | resource->state = ACPI_POWER_RESOURCE_STATE_OFF; | |
142 | ||
143 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n", | |
4be44fcd | 144 | resource->name, resource->state ? "on" : "off")); |
1da177e4 | 145 | |
d550d98d | 146 | return 0; |
1da177e4 LT |
147 | } |
148 | ||
4be44fcd | 149 | static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) |
1da177e4 | 150 | { |
4be44fcd | 151 | int result = 0; |
1da177e4 | 152 | struct acpi_power_resource *resource = NULL; |
4be44fcd | 153 | u32 i = 0; |
1da177e4 | 154 | |
1da177e4 LT |
155 | |
156 | if (!list || !state) | |
d550d98d | 157 | return -EINVAL; |
1da177e4 LT |
158 | |
159 | /* The state of the list is 'on' IFF all resources are 'on'. */ | |
160 | ||
4be44fcd | 161 | for (i = 0; i < list->count; i++) { |
1da177e4 LT |
162 | result = acpi_power_get_context(list->handles[i], &resource); |
163 | if (result) | |
d550d98d | 164 | return result; |
1da177e4 LT |
165 | result = acpi_power_get_state(resource); |
166 | if (result) | |
d550d98d | 167 | return result; |
1da177e4 LT |
168 | |
169 | *state = resource->state; | |
170 | ||
171 | if (*state != ACPI_POWER_RESOURCE_STATE_ON) | |
172 | break; | |
173 | } | |
174 | ||
175 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", | |
4be44fcd | 176 | *state ? "on" : "off")); |
1da177e4 | 177 | |
d550d98d | 178 | return result; |
1da177e4 LT |
179 | } |
180 | ||
0a613902 | 181 | static int acpi_power_on(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 182 | { |
4be44fcd | 183 | int result = 0; |
0a613902 | 184 | int found = 0; |
4be44fcd | 185 | acpi_status status = AE_OK; |
1da177e4 | 186 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
187 | struct list_head *node, *next; |
188 | struct acpi_power_reference *ref; | |
1da177e4 | 189 | |
1da177e4 LT |
190 | |
191 | result = acpi_power_get_context(handle, &resource); | |
192 | if (result) | |
d550d98d | 193 | return result; |
1da177e4 | 194 | |
0a613902 KK |
195 | mutex_lock(&resource->resource_lock); |
196 | list_for_each_safe(node, next, &resource->reference) { | |
197 | ref = container_of(node, struct acpi_power_reference, node); | |
198 | if (dev->handle == ref->device->handle) { | |
199 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n", | |
200 | dev->pnp.bus_id, resource->name)); | |
201 | found = 1; | |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
206 | if (!found) { | |
207 | ref = kmalloc(sizeof (struct acpi_power_reference), | |
208 | irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL); | |
209 | if (!ref) { | |
210 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n")); | |
211 | mutex_unlock(&resource->resource_lock); | |
212 | return -ENOMEM; | |
213 | } | |
214 | list_add_tail(&ref->node, &resource->reference); | |
215 | ref->device = dev; | |
216 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n", | |
217 | dev->pnp.bus_id, resource->name)); | |
218 | } | |
219 | mutex_unlock(&resource->resource_lock); | |
1da177e4 | 220 | |
0a613902 | 221 | if (resource->state == ACPI_POWER_RESOURCE_STATE_ON) { |
1da177e4 | 222 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n", |
4be44fcd | 223 | resource->name)); |
d550d98d | 224 | return 0; |
1da177e4 LT |
225 | } |
226 | ||
5fbc19ef | 227 | status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL); |
1da177e4 | 228 | if (ACPI_FAILURE(status)) |
d550d98d | 229 | return -ENODEV; |
1da177e4 LT |
230 | |
231 | result = acpi_power_get_state(resource); | |
232 | if (result) | |
d550d98d | 233 | return result; |
1da177e4 | 234 | if (resource->state != ACPI_POWER_RESOURCE_STATE_ON) |
d550d98d | 235 | return -ENOEXEC; |
1da177e4 LT |
236 | |
237 | /* Update the power resource's _device_ power state */ | |
41598572 | 238 | resource->device->power.state = ACPI_STATE_D0; |
1da177e4 LT |
239 | |
240 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n", | |
4be44fcd | 241 | resource->name)); |
d550d98d | 242 | return 0; |
1da177e4 LT |
243 | } |
244 | ||
0a613902 | 245 | static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev) |
1da177e4 | 246 | { |
4be44fcd LB |
247 | int result = 0; |
248 | acpi_status status = AE_OK; | |
1da177e4 | 249 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
250 | struct list_head *node, *next; |
251 | struct acpi_power_reference *ref; | |
252 | ||
1da177e4 | 253 | |
1da177e4 LT |
254 | result = acpi_power_get_context(handle, &resource); |
255 | if (result) | |
d550d98d | 256 | return result; |
1da177e4 | 257 | |
0a613902 KK |
258 | mutex_lock(&resource->resource_lock); |
259 | list_for_each_safe(node, next, &resource->reference) { | |
260 | ref = container_of(node, struct acpi_power_reference, node); | |
261 | if (dev->handle == ref->device->handle) { | |
262 | list_del(&ref->node); | |
263 | kfree(ref); | |
264 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n", | |
265 | dev->pnp.bus_id, resource->name)); | |
266 | break; | |
267 | } | |
268 | } | |
1da177e4 | 269 | |
0a613902 KK |
270 | if (!list_empty(&resource->reference)) { |
271 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n", | |
272 | resource->name)); | |
273 | mutex_unlock(&resource->resource_lock); | |
d550d98d | 274 | return 0; |
1da177e4 | 275 | } |
0a613902 | 276 | mutex_unlock(&resource->resource_lock); |
1da177e4 LT |
277 | |
278 | if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) { | |
279 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n", | |
0a613902 | 280 | resource->name)); |
d550d98d | 281 | return 0; |
1da177e4 LT |
282 | } |
283 | ||
5fbc19ef | 284 | status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL); |
1da177e4 | 285 | if (ACPI_FAILURE(status)) |
d550d98d | 286 | return -ENODEV; |
1da177e4 LT |
287 | |
288 | result = acpi_power_get_state(resource); | |
289 | if (result) | |
d550d98d | 290 | return result; |
1da177e4 | 291 | if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF) |
d550d98d | 292 | return -ENOEXEC; |
1da177e4 LT |
293 | |
294 | /* Update the power resource's _device_ power state */ | |
786f18c6 | 295 | resource->device->power.state = ACPI_STATE_D3; |
1da177e4 LT |
296 | |
297 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n", | |
4be44fcd | 298 | resource->name)); |
1da177e4 | 299 | |
d550d98d | 300 | return 0; |
1da177e4 LT |
301 | } |
302 | ||
303 | /* | |
304 | * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229): | |
305 | * 1. Power on the power resources required for the wakeup device | |
306 | * 2. Enable _PSW (power state wake) for the device if present | |
307 | */ | |
4be44fcd | 308 | int acpi_enable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 309 | { |
4be44fcd LB |
310 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
311 | struct acpi_object_list arg_list = { 1, &arg }; | |
312 | acpi_status status = AE_OK; | |
313 | int i; | |
314 | int ret = 0; | |
1da177e4 | 315 | |
1da177e4 | 316 | if (!dev || !dev->wakeup.flags.valid) |
d550d98d | 317 | return -1; |
1da177e4 LT |
318 | |
319 | arg.integer.value = 1; | |
320 | /* Open power resource */ | |
321 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
0a613902 | 322 | ret = acpi_power_on(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 323 | if (ret) { |
6468463a | 324 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 325 | dev->wakeup.flags.valid = 0; |
d550d98d | 326 | return -1; |
1da177e4 LT |
327 | } |
328 | } | |
329 | ||
330 | /* Execute PSW */ | |
331 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
332 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
6468463a | 333 | printk(KERN_ERR PREFIX "Evaluate _PSW\n"); |
1da177e4 LT |
334 | dev->wakeup.flags.valid = 0; |
335 | ret = -1; | |
336 | } | |
337 | ||
d550d98d | 338 | return ret; |
1da177e4 LT |
339 | } |
340 | ||
341 | /* | |
342 | * Shutdown a wakeup device, counterpart of above method | |
343 | * 1. Disable _PSW (power state wake) | |
344 | * 2. Shutdown down the power resources | |
345 | */ | |
4be44fcd | 346 | int acpi_disable_wakeup_device_power(struct acpi_device *dev) |
1da177e4 | 347 | { |
4be44fcd LB |
348 | union acpi_object arg = { ACPI_TYPE_INTEGER }; |
349 | struct acpi_object_list arg_list = { 1, &arg }; | |
350 | acpi_status status = AE_OK; | |
351 | int i; | |
352 | int ret = 0; | |
1da177e4 | 353 | |
1da177e4 LT |
354 | |
355 | if (!dev || !dev->wakeup.flags.valid) | |
d550d98d | 356 | return -1; |
1da177e4 | 357 | |
4be44fcd | 358 | arg.integer.value = 0; |
1da177e4 LT |
359 | /* Execute PSW */ |
360 | status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL); | |
361 | if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { | |
6468463a | 362 | printk(KERN_ERR PREFIX "Evaluate _PSW\n"); |
1da177e4 | 363 | dev->wakeup.flags.valid = 0; |
d550d98d | 364 | return -1; |
1da177e4 LT |
365 | } |
366 | ||
367 | /* Close power resource */ | |
368 | for (i = 0; i < dev->wakeup.resources.count; i++) { | |
0a613902 | 369 | ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev); |
1da177e4 | 370 | if (ret) { |
6468463a | 371 | printk(KERN_ERR PREFIX "Transition power state\n"); |
1da177e4 | 372 | dev->wakeup.flags.valid = 0; |
d550d98d | 373 | return -1; |
1da177e4 LT |
374 | } |
375 | } | |
376 | ||
d550d98d | 377 | return ret; |
1da177e4 LT |
378 | } |
379 | ||
380 | /* -------------------------------------------------------------------------- | |
381 | Device Power Management | |
382 | -------------------------------------------------------------------------- */ | |
383 | ||
4be44fcd | 384 | int acpi_power_get_inferred_state(struct acpi_device *device) |
1da177e4 | 385 | { |
4be44fcd LB |
386 | int result = 0; |
387 | struct acpi_handle_list *list = NULL; | |
388 | int list_state = 0; | |
389 | int i = 0; | |
1da177e4 | 390 | |
1da177e4 LT |
391 | |
392 | if (!device) | |
d550d98d | 393 | return -EINVAL; |
1da177e4 LT |
394 | |
395 | device->power.state = ACPI_STATE_UNKNOWN; | |
396 | ||
397 | /* | |
398 | * We know a device's inferred power state when all the resources | |
399 | * required for a given D-state are 'on'. | |
400 | */ | |
4be44fcd | 401 | for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) { |
1da177e4 LT |
402 | list = &device->power.states[i].resources; |
403 | if (list->count < 1) | |
404 | continue; | |
405 | ||
406 | result = acpi_power_get_list_state(list, &list_state); | |
407 | if (result) | |
d550d98d | 408 | return result; |
1da177e4 LT |
409 | |
410 | if (list_state == ACPI_POWER_RESOURCE_STATE_ON) { | |
411 | device->power.state = i; | |
d550d98d | 412 | return 0; |
1da177e4 LT |
413 | } |
414 | } | |
415 | ||
416 | device->power.state = ACPI_STATE_D3; | |
417 | ||
d550d98d | 418 | return 0; |
1da177e4 LT |
419 | } |
420 | ||
4be44fcd | 421 | int acpi_power_transition(struct acpi_device *device, int state) |
1da177e4 | 422 | { |
4be44fcd LB |
423 | int result = 0; |
424 | struct acpi_handle_list *cl = NULL; /* Current Resources */ | |
425 | struct acpi_handle_list *tl = NULL; /* Target Resources */ | |
426 | int i = 0; | |
1da177e4 | 427 | |
1da177e4 LT |
428 | |
429 | if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) | |
d550d98d | 430 | return -EINVAL; |
1da177e4 | 431 | |
4be44fcd LB |
432 | if ((device->power.state < ACPI_STATE_D0) |
433 | || (device->power.state > ACPI_STATE_D3)) | |
d550d98d | 434 | return -ENODEV; |
1da177e4 LT |
435 | |
436 | cl = &device->power.states[device->power.state].resources; | |
437 | tl = &device->power.states[state].resources; | |
438 | ||
439 | device->power.state = ACPI_STATE_UNKNOWN; | |
440 | ||
441 | if (!cl->count && !tl->count) { | |
442 | result = -ENODEV; | |
443 | goto end; | |
444 | } | |
445 | ||
446 | /* TBD: Resources must be ordered. */ | |
447 | ||
448 | /* | |
449 | * First we reference all power resources required in the target list | |
450 | * (e.g. so the device doesn't lose power while transitioning). | |
451 | */ | |
4be44fcd | 452 | for (i = 0; i < tl->count; i++) { |
0a613902 | 453 | result = acpi_power_on(tl->handles[i], device); |
1da177e4 LT |
454 | if (result) |
455 | goto end; | |
456 | } | |
457 | ||
b1028c54 KK |
458 | if (device->power.state == state) { |
459 | goto end; | |
460 | } | |
461 | ||
1da177e4 LT |
462 | /* |
463 | * Then we dereference all power resources used in the current list. | |
464 | */ | |
4be44fcd | 465 | for (i = 0; i < cl->count; i++) { |
0a613902 | 466 | result = acpi_power_off_device(cl->handles[i], device); |
1da177e4 LT |
467 | if (result) |
468 | goto end; | |
469 | } | |
470 | ||
471 | /* We shouldn't change the state till all above operations succeed */ | |
472 | device->power.state = state; | |
4be44fcd | 473 | end: |
1da177e4 | 474 | if (result) |
cece9296 LB |
475 | printk(KERN_WARNING PREFIX "Transitioning device [%s] to D%d\n", |
476 | device->pnp.bus_id, state); | |
1da177e4 | 477 | |
d550d98d | 478 | return result; |
1da177e4 LT |
479 | } |
480 | ||
1da177e4 LT |
481 | /* -------------------------------------------------------------------------- |
482 | FS Interface (/proc) | |
483 | -------------------------------------------------------------------------- */ | |
484 | ||
4be44fcd | 485 | static struct proc_dir_entry *acpi_power_dir; |
1da177e4 LT |
486 | |
487 | static int acpi_power_seq_show(struct seq_file *seq, void *offset) | |
488 | { | |
0a613902 KK |
489 | int count = 0; |
490 | int result = 0; | |
1da177e4 | 491 | struct acpi_power_resource *resource = NULL; |
0a613902 KK |
492 | struct list_head *node, *next; |
493 | struct acpi_power_reference *ref; | |
1da177e4 | 494 | |
1da177e4 | 495 | |
50dd0969 | 496 | resource = seq->private; |
1da177e4 LT |
497 | |
498 | if (!resource) | |
499 | goto end; | |
500 | ||
0a613902 KK |
501 | result = acpi_power_get_state(resource); |
502 | if (result) | |
503 | goto end; | |
504 | ||
1da177e4 LT |
505 | seq_puts(seq, "state: "); |
506 | switch (resource->state) { | |
507 | case ACPI_POWER_RESOURCE_STATE_ON: | |
508 | seq_puts(seq, "on\n"); | |
509 | break; | |
510 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
511 | seq_puts(seq, "off\n"); | |
512 | break; | |
513 | default: | |
514 | seq_puts(seq, "unknown\n"); | |
515 | break; | |
516 | } | |
517 | ||
0a613902 KK |
518 | mutex_lock(&resource->resource_lock); |
519 | list_for_each_safe(node, next, &resource->reference) { | |
520 | ref = container_of(node, struct acpi_power_reference, node); | |
521 | count++; | |
522 | } | |
523 | mutex_unlock(&resource->resource_lock); | |
524 | ||
1da177e4 | 525 | seq_printf(seq, "system level: S%d\n" |
4be44fcd LB |
526 | "order: %d\n" |
527 | "reference count: %d\n", | |
528 | resource->system_level, | |
0a613902 | 529 | resource->order, count); |
1da177e4 | 530 | |
4be44fcd | 531 | end: |
d550d98d | 532 | return 0; |
1da177e4 LT |
533 | } |
534 | ||
535 | static int acpi_power_open_fs(struct inode *inode, struct file *file) | |
536 | { | |
537 | return single_open(file, acpi_power_seq_show, PDE(inode)->data); | |
538 | } | |
539 | ||
4be44fcd | 540 | static int acpi_power_add_fs(struct acpi_device *device) |
1da177e4 | 541 | { |
4be44fcd | 542 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 543 | |
1da177e4 LT |
544 | |
545 | if (!device) | |
d550d98d | 546 | return -EINVAL; |
1da177e4 LT |
547 | |
548 | if (!acpi_device_dir(device)) { | |
549 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 550 | acpi_power_dir); |
1da177e4 | 551 | if (!acpi_device_dir(device)) |
d550d98d | 552 | return -ENODEV; |
1da177e4 LT |
553 | } |
554 | ||
555 | /* 'status' [R] */ | |
556 | entry = create_proc_entry(ACPI_POWER_FILE_STATUS, | |
4be44fcd | 557 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 | 558 | if (!entry) |
d550d98d | 559 | return -EIO; |
1da177e4 LT |
560 | else { |
561 | entry->proc_fops = &acpi_power_fops; | |
562 | entry->data = acpi_driver_data(device); | |
563 | } | |
564 | ||
d550d98d | 565 | return 0; |
1da177e4 LT |
566 | } |
567 | ||
4be44fcd | 568 | static int acpi_power_remove_fs(struct acpi_device *device) |
1da177e4 | 569 | { |
1da177e4 LT |
570 | |
571 | if (acpi_device_dir(device)) { | |
572 | remove_proc_entry(ACPI_POWER_FILE_STATUS, | |
573 | acpi_device_dir(device)); | |
574 | remove_proc_entry(acpi_device_bid(device), acpi_power_dir); | |
575 | acpi_device_dir(device) = NULL; | |
576 | } | |
577 | ||
d550d98d | 578 | return 0; |
1da177e4 LT |
579 | } |
580 | ||
1da177e4 LT |
581 | /* -------------------------------------------------------------------------- |
582 | Driver Interface | |
583 | -------------------------------------------------------------------------- */ | |
584 | ||
4be44fcd | 585 | static int acpi_power_add(struct acpi_device *device) |
1da177e4 | 586 | { |
4be44fcd LB |
587 | int result = 0; |
588 | acpi_status status = AE_OK; | |
1da177e4 | 589 | struct acpi_power_resource *resource = NULL; |
4be44fcd LB |
590 | union acpi_object acpi_object; |
591 | struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object }; | |
1da177e4 | 592 | |
1da177e4 LT |
593 | |
594 | if (!device) | |
d550d98d | 595 | return -EINVAL; |
1da177e4 | 596 | |
36bcbec7 | 597 | resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL); |
1da177e4 | 598 | if (!resource) |
d550d98d | 599 | return -ENOMEM; |
1da177e4 | 600 | |
41598572 | 601 | resource->device = device; |
0a613902 KK |
602 | mutex_init(&resource->resource_lock); |
603 | INIT_LIST_HEAD(&resource->reference); | |
1da177e4 LT |
604 | strcpy(resource->name, device->pnp.bus_id); |
605 | strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME); | |
606 | strcpy(acpi_device_class(device), ACPI_POWER_CLASS); | |
607 | acpi_driver_data(device) = resource; | |
608 | ||
609 | /* Evalute the object to get the system level and resource order. */ | |
5fbc19ef | 610 | status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer); |
1da177e4 LT |
611 | if (ACPI_FAILURE(status)) { |
612 | result = -ENODEV; | |
613 | goto end; | |
614 | } | |
615 | resource->system_level = acpi_object.power_resource.system_level; | |
616 | resource->order = acpi_object.power_resource.resource_order; | |
617 | ||
618 | result = acpi_power_get_state(resource); | |
619 | if (result) | |
620 | goto end; | |
621 | ||
622 | switch (resource->state) { | |
623 | case ACPI_POWER_RESOURCE_STATE_ON: | |
624 | device->power.state = ACPI_STATE_D0; | |
625 | break; | |
626 | case ACPI_POWER_RESOURCE_STATE_OFF: | |
627 | device->power.state = ACPI_STATE_D3; | |
628 | break; | |
629 | default: | |
630 | device->power.state = ACPI_STATE_UNKNOWN; | |
631 | break; | |
632 | } | |
633 | ||
634 | result = acpi_power_add_fs(device); | |
635 | if (result) | |
636 | goto end; | |
4be44fcd | 637 | |
1da177e4 | 638 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device), |
4be44fcd | 639 | acpi_device_bid(device), resource->state ? "on" : "off"); |
1da177e4 | 640 | |
4be44fcd | 641 | end: |
1da177e4 LT |
642 | if (result) |
643 | kfree(resource); | |
4be44fcd | 644 | |
d550d98d | 645 | return result; |
1da177e4 LT |
646 | } |
647 | ||
4be44fcd | 648 | static int acpi_power_remove(struct acpi_device *device, int type) |
1da177e4 LT |
649 | { |
650 | struct acpi_power_resource *resource = NULL; | |
0a613902 | 651 | struct list_head *node, *next; |
1da177e4 | 652 | |
1da177e4 LT |
653 | |
654 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 655 | return -EINVAL; |
1da177e4 | 656 | |
50dd0969 | 657 | resource = acpi_driver_data(device); |
1da177e4 LT |
658 | |
659 | acpi_power_remove_fs(device); | |
660 | ||
0a613902 KK |
661 | mutex_lock(&resource->resource_lock); |
662 | list_for_each_safe(node, next, &resource->reference) { | |
663 | struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node); | |
664 | list_del(&ref->node); | |
665 | kfree(ref); | |
666 | } | |
667 | mutex_unlock(&resource->resource_lock); | |
668 | ||
1da177e4 LT |
669 | kfree(resource); |
670 | ||
d550d98d | 671 | return 0; |
1da177e4 LT |
672 | } |
673 | ||
e8363f33 | 674 | static int acpi_power_resume(struct acpi_device *device) |
0a613902 KK |
675 | { |
676 | int result = 0; | |
677 | struct acpi_power_resource *resource = NULL; | |
678 | struct acpi_power_reference *ref; | |
679 | ||
680 | if (!device || !acpi_driver_data(device)) | |
681 | return -EINVAL; | |
682 | ||
683 | resource = (struct acpi_power_resource *)acpi_driver_data(device); | |
684 | ||
685 | result = acpi_power_get_state(resource); | |
686 | if (result) | |
687 | return result; | |
688 | ||
689 | mutex_lock(&resource->resource_lock); | |
690 | if ((resource->state == ACPI_POWER_RESOURCE_STATE_ON) && | |
691 | list_empty(&resource->reference)) { | |
692 | mutex_unlock(&resource->resource_lock); | |
693 | result = acpi_power_off_device(device->handle, NULL); | |
694 | return result; | |
695 | } | |
696 | ||
697 | if ((resource->state == ACPI_POWER_RESOURCE_STATE_OFF) && | |
698 | !list_empty(&resource->reference)) { | |
699 | ref = container_of(resource->reference.next, struct acpi_power_reference, node); | |
700 | mutex_unlock(&resource->resource_lock); | |
701 | result = acpi_power_on(device->handle, ref->device); | |
702 | return result; | |
703 | } | |
704 | ||
705 | mutex_unlock(&resource->resource_lock); | |
706 | return 0; | |
707 | } | |
708 | ||
4be44fcd | 709 | static int __init acpi_power_init(void) |
1da177e4 | 710 | { |
4be44fcd | 711 | int result = 0; |
1da177e4 | 712 | |
1da177e4 LT |
713 | |
714 | if (acpi_disabled) | |
d550d98d | 715 | return 0; |
1da177e4 LT |
716 | |
717 | INIT_LIST_HEAD(&acpi_power_resource_list); | |
718 | ||
719 | acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir); | |
720 | if (!acpi_power_dir) | |
d550d98d | 721 | return -ENODEV; |
1da177e4 LT |
722 | |
723 | result = acpi_bus_register_driver(&acpi_power_driver); | |
724 | if (result < 0) { | |
725 | remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir); | |
d550d98d | 726 | return -ENODEV; |
1da177e4 LT |
727 | } |
728 | ||
d550d98d | 729 | return 0; |
1da177e4 LT |
730 | } |
731 | ||
732 | subsys_initcall(acpi_power_init); |