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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +020045#include "sleep.h"
46
Len Browna192a952009-07-28 16:45:54 -040047#define PREFIX "ACPI: "
48
Bjorn Helgaas89595b82008-11-07 16:57:45 -070049#define _COMPONENT ACPI_POWER_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050050ACPI_MODULE_NAME("power");
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define ACPI_POWER_CLASS "power_resource"
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#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
Zhao Yakuif5adfaa2008-08-11 14:57:50 +080058
Len Brown4be44fc2005-08-05 00:44:28 -040059static int acpi_power_add(struct acpi_device *device);
60static int acpi_power_remove(struct acpi_device *device, int type);
Len Browne8363f32007-02-16 02:05:39 -050061static int acpi_power_resume(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Márton Némethc97adf92010-01-10 17:15:36 +010063static const struct acpi_device_id power_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020064 {ACPI_POWER_HID, 0},
65 {"", 0},
66};
67MODULE_DEVICE_TABLE(acpi, power_device_ids);
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069static struct acpi_driver acpi_power_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050070 .name = "power",
Len Brown4be44fc2005-08-05 00:44:28 -040071 .class = ACPI_POWER_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020072 .ids = power_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040073 .ops = {
74 .add = acpi_power_add,
75 .remove = acpi_power_remove,
Konstantin Karasyov0a613902007-02-16 01:47:06 -050076 .resume = acpi_power_resume,
Len Brown4be44fc2005-08-05 00:44:28 -040077 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070078};
79
Len Brown4be44fc2005-08-05 00:44:28 -040080struct acpi_power_resource {
Patrick Mochel41598572006-05-19 16:54:40 -040081 struct acpi_device * device;
Len Brown4be44fc2005-08-05 00:44:28 -040082 acpi_bus_id name;
83 u32 system_level;
84 u32 order;
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +020085 unsigned int ref_count;
Konstantin Karasyov0a613902007-02-16 01:47:06 -050086 struct mutex resource_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087};
88
Len Brown4be44fc2005-08-05 00:44:28 -040089static struct list_head acpi_power_resource_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/* --------------------------------------------------------------------------
92 Power Resource Management
93 -------------------------------------------------------------------------- */
94
95static int
Len Brown4be44fc2005-08-05 00:44:28 -040096acpi_power_get_context(acpi_handle handle,
97 struct acpi_power_resource **resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Len Brown4be44fc2005-08-05 00:44:28 -040099 int result = 0;
100 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400104 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 result = acpi_bus_get_device(handle, &device);
107 if (result) {
Len Browncece9292006-06-26 23:04:31 -0400108 printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
Patrick Mocheld550d982006-06-27 00:41:40 -0400109 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200112 *resource = acpi_driver_data(device);
Li Zefana815ab82008-04-18 13:27:29 -0700113 if (!*resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400114 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Patrick Mocheld550d982006-06-27 00:41:40 -0400116 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117}
118
Zhao Yakuia51e1452008-08-11 14:55:05 +0800119static int acpi_power_get_state(acpi_handle handle, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
Len Brown4be44fc2005-08-05 00:44:28 -0400121 acpi_status status = AE_OK;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400122 unsigned long long sta = 0;
Lin Ming60a4ce72008-12-16 17:02:22 +0800123 char node_name[5];
124 struct acpi_buffer buffer = { sizeof(node_name), node_name };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Zhao Yakuia51e1452008-08-11 14:55:05 +0800127 if (!handle || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400128 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Zhao Yakuia51e1452008-08-11 14:55:05 +0800130 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400132 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400134 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
135 ACPI_POWER_RESOURCE_STATE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Lin Ming60a4ce72008-12-16 17:02:22 +0800137 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
Lin Ming60a4ce72008-12-16 17:02:22 +0800140 node_name,
Zhao Yakuib1b57fb2008-10-27 16:04:53 +0800141 *state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Patrick Mocheld550d982006-06-27 00:41:40 -0400143 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
Len Brown4be44fc2005-08-05 00:44:28 -0400146static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147{
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100148 int cur_state;
149 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 if (!list || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400152 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 /* The state of the list is 'on' IFF all resources are 'on'. */
155
Len Brown4be44fc2005-08-05 00:44:28 -0400156 for (i = 0; i < list->count; i++) {
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100157 struct acpi_power_resource *resource;
158 acpi_handle handle = list->handles[i];
159 int result;
160
161 result = acpi_power_get_context(handle, &resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400163 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100165 mutex_lock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100167 result = acpi_power_get_state(handle, &cur_state);
168
169 mutex_unlock(&resource->resource_lock);
170
171 if (result)
172 return result;
173
174 if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 break;
176 }
177
178 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100179 cur_state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Rafael J. Wysockid0515d92011-01-06 23:38:57 +0100181 *state = cur_state;
182
183 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200186static int __acpi_power_on(struct acpi_power_resource *resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
Len Brown4be44fc2005-08-05 00:44:28 -0400188 acpi_status status = AE_OK;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500189
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400190 status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400192 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 /* Update the power resource's _device_ power state */
Patrick Mochel41598572006-05-19 16:54:40 -0400195 resource->device->power.state = ACPI_STATE_D0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200197 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400198 resource->name));
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200199
Patrick Mocheld550d982006-06-27 00:41:40 -0400200 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200203static int acpi_power_on(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
Bjorn Helgaasbdf43bb2009-05-21 17:28:53 -0600205 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 result = acpi_power_get_context(handle, &resource);
209 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400210 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500212 mutex_lock(&resource->resource_lock);
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200213
214 if (resource->ref_count++) {
215 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
216 "Power resource [%s] already on",
217 resource->name));
218 } else {
219 result = __acpi_power_on(resource);
Rafael J. Wysocki12b3b5a2010-11-25 00:03:32 +0100220 if (result)
221 resource->ref_count--;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500224 mutex_unlock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Rafael J. Wysocki12b3b5a2010-11-25 00:03:32 +0100226 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
Rafael J. Wysocki36237fa2011-01-06 23:38:04 +0100229static int acpi_power_off(acpi_handle handle)
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200230{
231 int result = 0;
232 acpi_status status = AE_OK;
233 struct acpi_power_resource *resource = NULL;
234
235 result = acpi_power_get_context(handle, &resource);
236 if (result)
237 return result;
238
239 mutex_lock(&resource->resource_lock);
240
241 if (!resource->ref_count) {
242 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
243 "Power resource [%s] already off",
244 resource->name));
245 goto unlock;
246 }
247
248 if (--resource->ref_count) {
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
250 "Power resource [%s] still in use\n",
251 resource->name));
252 goto unlock;
253 }
254
255 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
256 if (ACPI_FAILURE(status)) {
257 result = -ENODEV;
258 } else {
259 /* Update the power resource's _device_ power state */
260 resource->device->power.state = ACPI_STATE_D3;
261
262 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
263 "Power resource [%s] turned off\n",
264 resource->name));
265 }
266
267 unlock:
268 mutex_unlock(&resource->resource_lock);
269
270 return result;
271}
272
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100273static void __acpi_power_off_list(struct acpi_handle_list *list, int num_res)
274{
275 int i;
276
277 for (i = num_res - 1; i >= 0 ; i--)
Rafael J. Wysocki36237fa2011-01-06 23:38:04 +0100278 acpi_power_off(list->handles[i]);
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100279}
280
281static void acpi_power_off_list(struct acpi_handle_list *list)
282{
283 __acpi_power_off_list(list, list->count);
284}
285
286static int acpi_power_on_list(struct acpi_handle_list *list)
287{
288 int result = 0;
289 int i;
290
291 for (i = 0; i < list->count; i++) {
292 result = acpi_power_on(list->handles[i]);
293 if (result) {
294 __acpi_power_off_list(list, i);
295 break;
296 }
297 }
298
299 return result;
300}
301
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200302/**
303 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
304 * ACPI 3.0) _PSW (Power State Wake)
305 * @dev: Device to handle.
306 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
307 * @sleep_state: Target sleep state of the system.
308 * @dev_state: Target power state of the device.
309 *
310 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
311 * State Wake) for the device, if present. On failure reset the device's
312 * wakeup.flags.valid flag.
313 *
314 * RETURN VALUE:
315 * 0 if either _DSW or _PSW has been successfully executed
316 * 0 if neither _DSW nor _PSW has been found
317 * -ENODEV if the execution of either _DSW or _PSW has failed
318 */
319int acpi_device_sleep_wake(struct acpi_device *dev,
320 int enable, int sleep_state, int dev_state)
321{
322 union acpi_object in_arg[3];
323 struct acpi_object_list arg_list = { 3, in_arg };
324 acpi_status status = AE_OK;
325
326 /*
327 * Try to execute _DSW first.
328 *
329 * Three agruments are needed for the _DSW object:
330 * Argument 0: enable/disable the wake capabilities
331 * Argument 1: target system state
332 * Argument 2: target device state
333 * When _DSW object is called to disable the wake capabilities, maybe
334 * the first argument is filled. The values of the other two agruments
335 * are meaningless.
336 */
337 in_arg[0].type = ACPI_TYPE_INTEGER;
338 in_arg[0].integer.value = enable;
339 in_arg[1].type = ACPI_TYPE_INTEGER;
340 in_arg[1].integer.value = sleep_state;
341 in_arg[2].type = ACPI_TYPE_INTEGER;
342 in_arg[2].integer.value = dev_state;
343 status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
344 if (ACPI_SUCCESS(status)) {
345 return 0;
346 } else if (status != AE_NOT_FOUND) {
347 printk(KERN_ERR PREFIX "_DSW execution failed\n");
348 dev->wakeup.flags.valid = 0;
349 return -ENODEV;
350 }
351
352 /* Execute _PSW */
353 arg_list.count = 1;
354 in_arg[0].integer.value = enable;
355 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
356 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
357 printk(KERN_ERR PREFIX "_PSW execution failed\n");
358 dev->wakeup.flags.valid = 0;
359 return -ENODEV;
360 }
361
362 return 0;
363}
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365/*
366 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
367 * 1. Power on the power resources required for the wakeup device
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200368 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
369 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 */
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200371int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200373 int i, err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200376 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200378 mutex_lock(&acpi_device_lock);
379
380 if (dev->wakeup.prepare_count++)
381 goto out;
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 /* Open power resource */
384 for (i = 0; i < dev->wakeup.resources.count; i++) {
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200385 int ret = acpi_power_on(dev->wakeup.resources.handles[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400387 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200389 err = -ENODEV;
390 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 }
392 }
393
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200394 /*
395 * Passing 3 as the third argument below means the device may be placed
396 * in arbitrary power state afterwards.
397 */
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200398 err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200399
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200400 err_out:
401 if (err)
402 dev->wakeup.prepare_count = 0;
403
404 out:
405 mutex_unlock(&acpi_device_lock);
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200406 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407}
408
409/*
410 * Shutdown a wakeup device, counterpart of above method
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200411 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
412 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 * 2. Shutdown down the power resources
414 */
Len Brown4be44fc2005-08-05 00:44:28 -0400415int acpi_disable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200417 int i, err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200420 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200422 mutex_lock(&acpi_device_lock);
423
424 if (--dev->wakeup.prepare_count > 0)
425 goto out;
426
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200427 /*
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200428 * Executing the code below even if prepare_count is already zero when
429 * the function is called may be useful, for example for initialisation.
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200430 */
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200431 if (dev->wakeup.prepare_count < 0)
432 dev->wakeup.prepare_count = 0;
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200433
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200434 err = acpi_device_sleep_wake(dev, 0, 0, 0);
435 if (err)
436 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
438 /* Close power resource */
439 for (i = 0; i < dev->wakeup.resources.count; i++) {
Rafael J. Wysocki36237fa2011-01-06 23:38:04 +0100440 int ret = acpi_power_off(dev->wakeup.resources.handles[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400442 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200444 err = -ENODEV;
445 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 }
447 }
448
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200449 out:
450 mutex_unlock(&acpi_device_lock);
451 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453
454/* --------------------------------------------------------------------------
455 Device Power Management
456 -------------------------------------------------------------------------- */
457
Rafael J. Wysocki32a00d22010-11-25 00:05:17 +0100458int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459{
Len Brown4be44fc2005-08-05 00:44:28 -0400460 int result = 0;
461 struct acpi_handle_list *list = NULL;
462 int list_state = 0;
463 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Rafael J. Wysocki32a00d22010-11-25 00:05:17 +0100465 if (!device || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400466 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 /*
469 * We know a device's inferred power state when all the resources
470 * required for a given D-state are 'on'.
471 */
Len Brown4be44fc2005-08-05 00:44:28 -0400472 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 list = &device->power.states[i].resources;
474 if (list->count < 1)
475 continue;
476
477 result = acpi_power_get_list_state(list, &list_state);
478 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400479 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
Rafael J. Wysocki32a00d22010-11-25 00:05:17 +0100482 *state = i;
Patrick Mocheld550d982006-06-27 00:41:40 -0400483 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 }
485 }
486
Rafael J. Wysocki32a00d22010-11-25 00:05:17 +0100487 *state = ACPI_STATE_D3;
Patrick Mocheld550d982006-06-27 00:41:40 -0400488 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489}
490
Rafael J. Wysocki30d3df42010-11-25 00:06:55 +0100491int acpi_power_on_resources(struct acpi_device *device, int state)
492{
493 if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
494 return -EINVAL;
495
496 return acpi_power_on_list(&device->power.states[state].resources);
497}
498
Len Brown4be44fc2005-08-05 00:44:28 -0400499int acpi_power_transition(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500{
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100501 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400504 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
Rafael J. Wysocki212967c2010-11-25 00:02:36 +0100506 if (device->power.state == state)
507 return 0;
508
Len Brown4be44fc2005-08-05 00:44:28 -0400509 if ((device->power.state < ACPI_STATE_D0)
510 || (device->power.state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400511 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 /* TBD: Resources must be ordered. */
514
515 /*
516 * First we reference all power resources required in the target list
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100517 * (e.g. so the device doesn't lose power while transitioning). Then,
518 * we dereference all power resources used in the current list.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 */
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100520 result = acpi_power_on_list(&device->power.states[state].resources);
521 if (!result)
522 acpi_power_off_list(
523 &device->power.states[device->power.state].resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Rafael J. Wysockid2ef5552010-11-25 00:06:09 +0100525 /* We shouldn't change the state unless the above operations succeed. */
526 device->power.state = result ? ACPI_STATE_UNKNOWN : state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Patrick Mocheld550d982006-06-27 00:41:40 -0400528 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531/* --------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 Driver Interface
533 -------------------------------------------------------------------------- */
534
Len Brown4be44fc2005-08-05 00:44:28 -0400535static int acpi_power_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400537 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400538 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400540 union acpi_object acpi_object;
541 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400545 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
Burman Yan36bcbec2006-12-19 12:56:11 -0800547 resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400549 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Patrick Mochel41598572006-05-19 16:54:40 -0400551 resource->device = device;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500552 mutex_init(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 strcpy(resource->name, device->pnp.bus_id);
554 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
555 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700556 device->driver_data = resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 /* Evalute the object to get the system level and resource order. */
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400559 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 if (ACPI_FAILURE(status)) {
561 result = -ENODEV;
562 goto end;
563 }
564 resource->system_level = acpi_object.power_resource.system_level;
565 resource->order = acpi_object.power_resource.resource_order;
566
Zhao Yakuia51e1452008-08-11 14:55:05 +0800567 result = acpi_power_get_state(device->handle, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 if (result)
569 goto end;
570
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400571 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 case ACPI_POWER_RESOURCE_STATE_ON:
573 device->power.state = ACPI_STATE_D0;
574 break;
575 case ACPI_POWER_RESOURCE_STATE_OFF:
576 device->power.state = ACPI_STATE_D3;
577 break;
578 default:
579 device->power.state = ACPI_STATE_UNKNOWN;
580 break;
581 }
582
Len Brown4be44fc2005-08-05 00:44:28 -0400583 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400584 acpi_device_bid(device), state ? "on" : "off");
Len Brown4be44fc2005-08-05 00:44:28 -0400585
586 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 if (result)
588 kfree(resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400589
Patrick Mocheld550d982006-06-27 00:41:40 -0400590 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591}
592
Len Brown4be44fc2005-08-05 00:44:28 -0400593static int acpi_power_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594{
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200595 struct acpi_power_resource *resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200597 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400598 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200600 resource = acpi_driver_data(device);
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200601 if (!resource)
602 return -EINVAL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500603
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 kfree(resource);
605
Patrick Mocheld550d982006-06-27 00:41:40 -0400606 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607}
608
Len Browne8363f32007-02-16 02:05:39 -0500609static int acpi_power_resume(struct acpi_device *device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500610{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400611 int result = 0, state;
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200612 struct acpi_power_resource *resource;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500613
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200614 if (!device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500615 return -EINVAL;
616
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700617 resource = acpi_driver_data(device);
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200618 if (!resource)
619 return -EINVAL;
620
621 mutex_lock(&resource->resource_lock);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500622
Zhao Yakuia51e1452008-08-11 14:55:05 +0800623 result = acpi_power_get_state(device->handle, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500624 if (result)
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200625 goto unlock;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500626
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200627 if (state == ACPI_POWER_RESOURCE_STATE_OFF && resource->ref_count)
628 result = __acpi_power_on(resource);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500629
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200630 unlock:
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500631 mutex_unlock(&resource->resource_lock);
Rafael J. Wysocki3e384ee2010-10-22 02:35:54 +0200632
633 return result;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500634}
635
Bjorn Helgaas44515372009-03-24 16:49:53 -0600636int __init acpi_power_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 INIT_LIST_HEAD(&acpi_power_resource_list);
Zhang Rui06af7eb2010-07-15 10:46:38 +0800639 return acpi_bus_register_driver(&acpi_power_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640}