blob: 0500f719f63e2aa3d7e8c711e809f84961eb8f4d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090042#include <linux/slab.h>
Lin Ming0090def2012-03-29 14:09:39 +080043#include <linux/pm_runtime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <acpi/acpi_bus.h>
45#include <acpi/acpi_drivers.h>
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +020046#include "sleep.h"
Lin Ming0090def2012-03-29 14:09:39 +080047#include "internal.h"
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +020048
Len Browna192a952009-07-28 16:45:54 -040049#define PREFIX "ACPI: "
50
Bjorn Helgaas89595b82008-11-07 16:57:45 -070051#define _COMPONENT ACPI_POWER_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050052ACPI_MODULE_NAME("power");
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#define ACPI_POWER_CLASS "power_resource"
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#define ACPI_POWER_DEVICE_NAME "Power Resource"
55#define ACPI_POWER_FILE_INFO "info"
56#define ACPI_POWER_FILE_STATUS "state"
57#define ACPI_POWER_RESOURCE_STATE_OFF 0x00
58#define ACPI_POWER_RESOURCE_STATE_ON 0x01
59#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
Zhao Yakuif5adfaa2008-08-11 14:57:50 +080060
Len Brown4be44fc2005-08-05 00:44:28 -040061static int acpi_power_add(struct acpi_device *device);
62static int acpi_power_remove(struct acpi_device *device, int type);
Len Browne8363f32007-02-16 02:05:39 -050063static int acpi_power_resume(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Márton Némethc97adf92010-01-10 17:15:36 +010065static const struct acpi_device_id power_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020066 {ACPI_POWER_HID, 0},
67 {"", 0},
68};
69MODULE_DEVICE_TABLE(acpi, power_device_ids);
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071static struct acpi_driver acpi_power_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050072 .name = "power",
Len Brown4be44fc2005-08-05 00:44:28 -040073 .class = ACPI_POWER_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020074 .ids = power_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040075 .ops = {
76 .add = acpi_power_add,
77 .remove = acpi_power_remove,
Konstantin Karasyov0a613902007-02-16 01:47:06 -050078 .resume = acpi_power_resume,
Len Brown4be44fc2005-08-05 00:44:28 -040079 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070080};
81
Lin Ming0090def2012-03-29 14:09:39 +080082/*
83 * A power managed device
84 * A device may rely on multiple power resources.
85 * */
86struct acpi_power_managed_device {
87 struct device *dev; /* The physical device */
88 acpi_handle *handle;
89};
90
91struct acpi_power_resource_device {
92 struct acpi_power_managed_device *device;
93 struct acpi_power_resource_device *next;
94};
95
Len Brown4be44fc2005-08-05 00:44:28 -040096struct acpi_power_resource {
Patrick Mochel41598572006-05-19 16:54:40 -040097 struct acpi_device * device;
Len Brown4be44fc2005-08-05 00:44:28 -040098 acpi_bus_id name;
99 u32 system_level;
100 u32 order;
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200101 unsigned int ref_count;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500102 struct mutex resource_lock;
Lin Ming0090def2012-03-29 14:09:39 +0800103
104 /* List of devices relying on this power resource */
105 struct acpi_power_resource_device *devices;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106};
107
Len Brown4be44fc2005-08-05 00:44:28 -0400108static struct list_head acpi_power_resource_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110/* --------------------------------------------------------------------------
111 Power Resource Management
112 -------------------------------------------------------------------------- */
113
114static int
Len Brown4be44fc2005-08-05 00:44:28 -0400115acpi_power_get_context(acpi_handle handle,
116 struct acpi_power_resource **resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
Len Brown4be44fc2005-08-05 00:44:28 -0400118 int result = 0;
119 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400123 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125 result = acpi_bus_get_device(handle, &device);
126 if (result) {
Len Browncece9292006-06-26 23:04:31 -0400127 printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
Patrick Mocheld550d982006-06-27 00:41:40 -0400128 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 }
130
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200131 *resource = acpi_driver_data(device);
Li Zefana815ab82008-04-18 13:27:29 -0700132 if (!*resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400133 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Patrick Mocheld550d982006-06-27 00:41:40 -0400135 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Zhao Yakuia51e1452008-08-11 14:55:05 +0800138static int acpi_power_get_state(acpi_handle handle, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
Len Brown4be44fc2005-08-05 00:44:28 -0400140 acpi_status status = AE_OK;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400141 unsigned long long sta = 0;
Lin Ming60a4ce72008-12-16 17:02:22 +0800142 char node_name[5];
143 struct acpi_buffer buffer = { sizeof(node_name), node_name };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Zhao Yakuia51e1452008-08-11 14:55:05 +0800146 if (!handle || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400147 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Zhao Yakuia51e1452008-08-11 14:55:05 +0800149 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400151 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400153 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
154 ACPI_POWER_RESOURCE_STATE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Lin Ming60a4ce72008-12-16 17:02:22 +0800156 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
Lin Ming60a4ce72008-12-16 17:02:22 +0800159 node_name,
Zhao Yakuib1b57fb2008-10-27 16:04:53 +0800160 *state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Patrick Mocheld550d982006-06-27 00:41:40 -0400162 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Len Brown4be44fc2005-08-05 00:44:28 -0400165static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100167 int cur_state;
168 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 if (!list || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400171 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173 /* The state of the list is 'on' IFF all resources are 'on'. */
174
Len Brown4be44fc2005-08-05 00:44:28 -0400175 for (i = 0; i < list->count; i++) {
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100176 struct acpi_power_resource *resource;
177 acpi_handle handle = list->handles[i];
178 int result;
179
180 result = acpi_power_get_context(handle, &resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400182 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100184 mutex_lock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100186 result = acpi_power_get_state(handle, &cur_state);
187
188 mutex_unlock(&resource->resource_lock);
189
190 if (result)
191 return result;
192
193 if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 break;
195 }
196
197 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100198 cur_state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100200 *state = cur_state;
201
202 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203}
204
Lin Ming0090def2012-03-29 14:09:39 +0800205/* Resume the device when all power resources in _PR0 are on */
206static void acpi_power_on_device(struct acpi_power_managed_device *device)
207{
208 struct acpi_device *acpi_dev;
209 acpi_handle handle = device->handle;
210 int state;
211
212 if (acpi_bus_get_device(handle, &acpi_dev))
213 return;
214
215 if(acpi_power_get_inferred_state(acpi_dev, &state))
216 return;
217
218 if (state == ACPI_STATE_D0 && pm_runtime_suspended(device->dev))
219 pm_request_resume(device->dev);
220}
221
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200222static int __acpi_power_on(struct acpi_power_resource *resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
Lin Ming0090def2012-03-29 14:09:39 +0800224 struct acpi_power_resource_device *device_list = resource->devices;
Len Brown4be44fc2005-08-05 00:44:28 -0400225 acpi_status status = AE_OK;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500226
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400227 status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400229 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 /* Update the power resource's _device_ power state */
Patrick Mochel41598572006-05-19 16:54:40 -0400232 resource->device->power.state = ACPI_STATE_D0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200234 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400235 resource->name));
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200236
Lin Ming0090def2012-03-29 14:09:39 +0800237 while (device_list) {
238 acpi_power_on_device(device_list->device);
239
240 device_list = device_list->next;
241 }
242
Patrick Mocheld550d982006-06-27 00:41:40 -0400243 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200246static int acpi_power_on(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
Bjorn Helgaasbdf43bb2009-05-21 17:28:53 -0600248 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 result = acpi_power_get_context(handle, &resource);
252 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400253 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500255 mutex_lock(&resource->resource_lock);
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200256
257 if (resource->ref_count++) {
258 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
259 "Power resource [%s] already on",
260 resource->name));
261 } else {
262 result = __acpi_power_on(resource);
Rafael J. Wysocki12b3b5a2010-11-25 00:03:32 +0100263 if (result)
264 resource->ref_count--;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500267 mutex_unlock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Rafael J. Wysocki12b3b5a2010-11-25 00:03:32 +0100269 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270}
271
Rafael J. Wysocki36237fa2011-01-06 23:38:04 +0100272static int acpi_power_off(acpi_handle handle)
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200273{
274 int result = 0;
275 acpi_status status = AE_OK;
276 struct acpi_power_resource *resource = NULL;
277
278 result = acpi_power_get_context(handle, &resource);
279 if (result)
280 return result;
281
282 mutex_lock(&resource->resource_lock);
283
284 if (!resource->ref_count) {
285 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
286 "Power resource [%s] already off",
287 resource->name));
288 goto unlock;
289 }
290
291 if (--resource->ref_count) {
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
293 "Power resource [%s] still in use\n",
294 resource->name));
295 goto unlock;
296 }
297
298 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
299 if (ACPI_FAILURE(status)) {
300 result = -ENODEV;
301 } else {
302 /* Update the power resource's _device_ power state */
303 resource->device->power.state = ACPI_STATE_D3;
304
305 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
306 "Power resource [%s] turned off\n",
307 resource->name));
308 }
309
310 unlock:
311 mutex_unlock(&resource->resource_lock);
312
313 return result;
314}
315
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100316static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res)
317{
318 int i;
319
320 for (i = num_res - 1; i >= 0 ; i--)
Rafael J. Wysocki36237fa2011-01-06 23:38:04 +0100321 acpi_power_off(list->handles[i]);
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100322}
323
324static void acpi_power_off_list(struct acpi_handle_list *list)
325{
326 __acpi_power_off_list(list, list->count);
327}
328
329static int acpi_power_on_list(struct acpi_handle_list *list)
330{
331 int result = 0;
332 int i;
333
334 for (i = 0; i < list->count; i++) {
335 result = acpi_power_on(list->handles[i]);
336 if (result) {
337 __acpi_power_off_list(list, i);
338 break;
339 }
340 }
341
342 return result;
343}
344
Lin Ming0090def2012-03-29 14:09:39 +0800345static void __acpi_power_resource_unregister_device(struct device *dev,
346 acpi_handle res_handle)
347{
348 struct acpi_power_resource *resource = NULL;
349 struct acpi_power_resource_device *prev, *curr;
350
351 if (acpi_power_get_context(res_handle, &resource))
352 return;
353
354 mutex_lock(&resource->resource_lock);
355 prev = NULL;
356 curr = resource->devices;
357 while (curr) {
358 if (curr->device->dev == dev) {
359 if (!prev)
360 resource->devices = curr->next;
361 else
362 prev->next = curr->next;
363
364 kfree(curr);
365 break;
366 }
367
368 prev = curr;
369 curr = curr->next;
370 }
371 mutex_unlock(&resource->resource_lock);
372}
373
374/* Unlink dev from all power resources in _PR0 */
375void acpi_power_resource_unregister_device(struct device *dev, acpi_handle handle)
376{
377 struct acpi_device *acpi_dev;
378 struct acpi_handle_list *list;
379 int i;
380
381 if (!dev || !handle)
382 return;
383
384 if (acpi_bus_get_device(handle, &acpi_dev))
385 return;
386
387 list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
388
389 for (i = 0; i < list->count; i++)
390 __acpi_power_resource_unregister_device(dev,
391 list->handles[i]);
392}
393
394static int __acpi_power_resource_register_device(
395 struct acpi_power_managed_device *powered_device, acpi_handle handle)
396{
397 struct acpi_power_resource *resource = NULL;
398 struct acpi_power_resource_device *power_resource_device;
399 int result;
400
401 result = acpi_power_get_context(handle, &resource);
402 if (result)
403 return result;
404
405 power_resource_device = kzalloc(
406 sizeof(*power_resource_device), GFP_KERNEL);
407 if (!power_resource_device)
408 return -ENOMEM;
409
410 power_resource_device->device = powered_device;
411
412 mutex_lock(&resource->resource_lock);
413 power_resource_device->next = resource->devices;
414 resource->devices = power_resource_device;
415 mutex_unlock(&resource->resource_lock);
416
417 return 0;
418}
419
420/* Link dev to all power resources in _PR0 */
421int acpi_power_resource_register_device(struct device *dev, acpi_handle handle)
422{
423 struct acpi_device *acpi_dev;
424 struct acpi_handle_list *list;
425 struct acpi_power_managed_device *powered_device;
426 int i, ret;
427
428 if (!dev || !handle)
429 return -ENODEV;
430
431 ret = acpi_bus_get_device(handle, &acpi_dev);
432 if (ret)
433 goto no_power_resource;
434
435 if (!acpi_dev->power.flags.power_resources)
436 goto no_power_resource;
437
438 powered_device = kzalloc(sizeof(*powered_device), GFP_KERNEL);
439 if (!powered_device)
440 return -ENOMEM;
441
442 powered_device->dev = dev;
443 powered_device->handle = handle;
444
445 list = &acpi_dev->power.states[ACPI_STATE_D0].resources;
446
447 for (i = 0; i < list->count; i++) {
448 ret = __acpi_power_resource_register_device(powered_device,
449 list->handles[i]);
450
451 if (ret) {
452 acpi_power_resource_unregister_device(dev, handle);
453 break;
454 }
455 }
456
457 return ret;
458
459no_power_resource:
460 printk(KERN_WARNING PREFIX "Invalid Power Resource to register!");
461 return -ENODEV;
462}
463
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200464/**
465 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
466 * ACPI 3.0) _PSW (Power State Wake)
467 * @dev: Device to handle.
468 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
469 * @sleep_state: Target sleep state of the system.
470 * @dev_state: Target power state of the device.
471 *
472 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
473 * State Wake) for the device, if present. On failure reset the device's
474 * wakeup.flags.valid flag.
475 *
476 * RETURN VALUE:
477 * 0 if either _DSW or _PSW has been successfully executed
478 * 0 if neither _DSW nor _PSW has been found
479 * -ENODEV if the execution of either _DSW or _PSW has failed
480 */
481int acpi_device_sleep_wake(struct acpi_device *dev,
482 int enable, int sleep_state, int dev_state)
483{
484 union acpi_object in_arg[3];
485 struct acpi_object_list arg_list = { 3, in_arg };
486 acpi_status status = AE_OK;
487
488 /*
489 * Try to execute _DSW first.
490 *
491 * Three agruments are needed for the _DSW object:
492 * Argument 0: enable/disable the wake capabilities
493 * Argument 1: target system state
494 * Argument 2: target device state
495 * When _DSW object is called to disable the wake capabilities, maybe
496 * the first argument is filled. The values of the other two agruments
497 * are meaningless.
498 */
499 in_arg[0].type = ACPI_TYPE_INTEGER;
500 in_arg[0].integer.value = enable;
501 in_arg[1].type = ACPI_TYPE_INTEGER;
502 in_arg[1].integer.value = sleep_state;
503 in_arg[2].type = ACPI_TYPE_INTEGER;
504 in_arg[2].integer.value = dev_state;
505 status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
506 if (ACPI_SUCCESS(status)) {
507 return 0;
508 } else if (status != AE_NOT_FOUND) {
509 printk(KERN_ERR PREFIX "_DSW execution failed\n");
510 dev->wakeup.flags.valid = 0;
511 return -ENODEV;
512 }
513
514 /* Execute _PSW */
515 arg_list.count = 1;
516 in_arg[0].integer.value = enable;
517 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
518 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
519 printk(KERN_ERR PREFIX "_PSW execution failed\n");
520 dev->wakeup.flags.valid = 0;
521 return -ENODEV;
522 }
523
524 return 0;
525}
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527/*
528 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
529 * 1. Power on the power resources required for the wakeup device
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200530 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
531 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 */
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200533int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534{
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200535 int i, err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200538 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200540 mutex_lock(&acpi_device_lock);
541
542 if (dev->wakeup.prepare_count++)
543 goto out;
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 /* Open power resource */
546 for (i = 0; i < dev->wakeup.resources.count; i++) {
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200547 int ret = acpi_power_on(dev->wakeup.resources.handles[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400549 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200551 err = -ENODEV;
552 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
554 }
555
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200556 /*
557 * Passing 3 as the third argument below means the device may be placed
558 * in arbitrary power state afterwards.
559 */
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200560 err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200561
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200562 err_out:
563 if (err)
564 dev->wakeup.prepare_count = 0;
565
566 out:
567 mutex_unlock(&acpi_device_lock);
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200568 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569}
570
571/*
572 * Shutdown a wakeup device, counterpart of above method
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200573 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
574 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 * 2. Shutdown down the power resources
576 */
Len Brown4be44fc2005-08-05 00:44:28 -0400577int acpi_disable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578{
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200579 int i, err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200582 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200584 mutex_lock(&acpi_device_lock);
585
586 if (--dev->wakeup.prepare_count > 0)
587 goto out;
588
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200589 /*
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200590 * Executing the code below even if prepare_count is already zero when
591 * the function is called may be useful, for example for initialisation.
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200592 */
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200593 if (dev->wakeup.prepare_count < 0)
594 dev->wakeup.prepare_count = 0;
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200595
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200596 err = acpi_device_sleep_wake(dev, 0, 0, 0);
597 if (err)
598 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 /* Close power resource */
601 for (i = 0; i < dev->wakeup.resources.count; i++) {
Rafael J. Wysocki36237fa2011-01-06 23:38:04 +0100602 int ret = acpi_power_off(dev->wakeup.resources.handles[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400604 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200606 err = -ENODEV;
607 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 }
609 }
610
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200611 out:
612 mutex_unlock(&acpi_device_lock);
613 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614}
615
616/* --------------------------------------------------------------------------
617 Device Power Management
618 -------------------------------------------------------------------------- */
619
Rafael J. Wysocki32a00d22010-11-25 00:05:17 +0100620int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621{
Len Brown4be44fc2005-08-05 00:44:28 -0400622 int result = 0;
623 struct acpi_handle_list *list = NULL;
624 int list_state = 0;
625 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
Rafael J. Wysocki32a00d22010-11-25 00:05:17 +0100627 if (!device || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400628 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 /*
631 * We know a device's inferred power state when all the resources
632 * required for a given D-state are 'on'.
633 */
Lin Ming1cc0c992012-04-23 09:03:49 +0800634 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3_HOT; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 list = &device->power.states[i].resources;
636 if (list->count < 1)
637 continue;
638
639 result = acpi_power_get_list_state(list, &list_state);
640 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400641 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
643 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
Rafael J. Wysocki32a00d22010-11-25 00:05:17 +0100644 *state = i;
Patrick Mocheld550d982006-06-27 00:41:40 -0400645 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 }
647 }
648
Rafael J. Wysocki32a00d22010-11-25 00:05:17 +0100649 *state = ACPI_STATE_D3;
Patrick Mocheld550d982006-06-27 00:41:40 -0400650 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651}
652
Rafael J. Wysocki30d3df42010-11-25 00:06:55 +0100653int acpi_power_on_resources(struct acpi_device *device, int state)
654{
655 if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
656 return -EINVAL;
657
658 return acpi_power_on_list(&device->power.states[state].resources);
659}
660
Len Brown4be44fc2005-08-05 00:44:28 -0400661int acpi_power_transition(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +0200663 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
Zhang Rui3ebc81b2012-03-29 14:09:38 +0800665 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
Patrick Mocheld550d982006-06-27 00:41:40 -0400666 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Rafael J. Wysocki212967c2010-11-25 00:02:36 +0100668 if (device->power.state == state)
669 return 0;
670
Len Brown4be44fc2005-08-05 00:44:28 -0400671 if ((device->power.state < ACPI_STATE_D0)
Zhang Rui3ebc81b2012-03-29 14:09:38 +0800672 || (device->power.state > ACPI_STATE_D3_COLD))
Patrick Mocheld550d982006-06-27 00:41:40 -0400673 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 /* TBD: Resources must be ordered. */
676
677 /*
678 * First we reference all power resources required in the target list
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100679 * (e.g. so the device doesn't lose power while transitioning). Then,
680 * we dereference all power resources used in the current list.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 */
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +0200682 if (state < ACPI_STATE_D3_COLD)
683 result = acpi_power_on_list(
684 &device->power.states[state].resources);
685
686 if (!result && device->power.state < ACPI_STATE_D3_COLD)
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100687 acpi_power_off_list(
688 &device->power.states[device->power.state].resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100690 /* We shouldn't change the state unless the above operations succeed. */
691 device->power.state = result ? ACPI_STATE_UNKNOWN : state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Patrick Mocheld550d982006-06-27 00:41:40 -0400693 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694}
695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696/* --------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 Driver Interface
698 -------------------------------------------------------------------------- */
699
Len Brown4be44fc2005-08-05 00:44:28 -0400700static int acpi_power_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400702 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400703 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400705 union acpi_object acpi_object;
706 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
709 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400710 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Burman Yan36bcbec2006-12-19 12:56:11 -0800712 resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400714 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
Patrick Mochel41598572006-05-19 16:54:40 -0400716 resource->device = device;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500717 mutex_init(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 strcpy(resource->name, device->pnp.bus_id);
719 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
720 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700721 device->driver_data = resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
723 /* Evalute the object to get the system level and resource order. */
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400724 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 if (ACPI_FAILURE(status)) {
726 result = -ENODEV;
727 goto end;
728 }
729 resource->system_level = acpi_object.power_resource.system_level;
730 resource->order = acpi_object.power_resource.resource_order;
731
Zhao Yakuia51e1452008-08-11 14:55:05 +0800732 result = acpi_power_get_state(device->handle, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 if (result)
734 goto end;
735
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400736 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 case ACPI_POWER_RESOURCE_STATE_ON:
738 device->power.state = ACPI_STATE_D0;
739 break;
740 case ACPI_POWER_RESOURCE_STATE_OFF:
741 device->power.state = ACPI_STATE_D3;
742 break;
743 default:
744 device->power.state = ACPI_STATE_UNKNOWN;
745 break;
746 }
747
Len Brown4be44fc2005-08-05 00:44:28 -0400748 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400749 acpi_device_bid(device), state ? "on" : "off");
Len Brown4be44fc2005-08-05 00:44:28 -0400750
751 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 if (result)
753 kfree(resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400754
Patrick Mocheld550d982006-06-27 00:41:40 -0400755 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756}
757
Len Brown4be44fc2005-08-05 00:44:28 -0400758static int acpi_power_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759{
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200760 struct acpi_power_resource *resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200762 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400763 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200765 resource = acpi_driver_data(device);
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200766 if (!resource)
767 return -EINVAL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 kfree(resource);
770
Patrick Mocheld550d982006-06-27 00:41:40 -0400771 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772}
773
Len Browne8363f32007-02-16 02:05:39 -0500774static int acpi_power_resume(struct acpi_device *device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500775{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400776 int result = 0, state;
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200777 struct acpi_power_resource *resource;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500778
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200779 if (!device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500780 return -EINVAL;
781
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700782 resource = acpi_driver_data(device);
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200783 if (!resource)
784 return -EINVAL;
785
786 mutex_lock(&resource->resource_lock);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500787
Zhao Yakuia51e1452008-08-11 14:55:05 +0800788 result = acpi_power_get_state(device->handle, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500789 if (result)
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200790 goto unlock;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500791
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200792 if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count)
793 result = __acpi_power_on(resource);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500794
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200795 unlock:
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500796 mutex_unlock(&resource->resource_lock);
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200797
798 return result;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500799}
800
Bjorn Helgaas44515372009-03-24 16:49:53 -0600801int __init acpi_power_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 INIT_LIST_HEAD(&acpi_power_resource_list);
Zhang Rui06af7eb2010-07-15 10:46:38 +0800804 return acpi_bus_register_driver(&acpi_power_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805}