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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>
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
Bjorn Helgaas89595b82008-11-07 16:57:45 -070047#define _COMPONENT ACPI_POWER_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050048ACPI_MODULE_NAME("power");
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#define ACPI_POWER_CLASS "power_resource"
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#define ACPI_POWER_DEVICE_NAME "Power Resource"
51#define ACPI_POWER_FILE_INFO "info"
52#define ACPI_POWER_FILE_STATUS "state"
53#define ACPI_POWER_RESOURCE_STATE_OFF 0x00
54#define ACPI_POWER_RESOURCE_STATE_ON 0x01
55#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
Zhao Yakuif5adfaa2008-08-11 14:57:50 +080056
Zhao Yakuif5adfaa2008-08-11 14:57:50 +080057int acpi_power_nocheck;
58module_param_named(power_nocheck, acpi_power_nocheck, bool, 000);
59
Len Brown4be44fc2005-08-05 00:44:28 -040060static int acpi_power_add(struct acpi_device *device);
61static int acpi_power_remove(struct acpi_device *device, int type);
Len Browne8363f32007-02-16 02:05:39 -050062static int acpi_power_resume(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static int acpi_power_open_fs(struct inode *inode, struct file *file);
64
Thomas Renninger1ba90e32007-07-23 14:44:41 +020065static struct acpi_device_id power_device_ids[] = {
66 {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 Brownc2b6705b2007-02-12 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
Konstantin Karasyov0a613902007-02-16 01:47:06 -050082struct acpi_power_reference {
83 struct list_head node;
84 struct acpi_device *device;
85};
86
Len Brown4be44fc2005-08-05 00:44:28 -040087struct acpi_power_resource {
Patrick Mochel41598572006-05-19 16:54:40 -040088 struct acpi_device * device;
Len Brown4be44fc2005-08-05 00:44:28 -040089 acpi_bus_id name;
90 u32 system_level;
91 u32 order;
Konstantin Karasyov0a613902007-02-16 01:47:06 -050092 struct mutex resource_lock;
93 struct list_head reference;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094};
95
Len Brown4be44fc2005-08-05 00:44:28 -040096static struct list_head acpi_power_resource_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Arjan van de Vend7508032006-07-04 13:06:00 -040098static const struct file_operations acpi_power_fops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -070099 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -0400100 .open = acpi_power_open_fs,
101 .read = seq_read,
102 .llseek = seq_lseek,
103 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104};
105
106/* --------------------------------------------------------------------------
107 Power Resource Management
108 -------------------------------------------------------------------------- */
109
110static int
Len Brown4be44fc2005-08-05 00:44:28 -0400111acpi_power_get_context(acpi_handle handle,
112 struct acpi_power_resource **resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
Len Brown4be44fc2005-08-05 00:44:28 -0400114 int result = 0;
115 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400119 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121 result = acpi_bus_get_device(handle, &device);
122 if (result) {
Len Browncece9292006-06-26 23:04:31 -0400123 printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
Patrick Mocheld550d982006-06-27 00:41:40 -0400124 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 }
126
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200127 *resource = acpi_driver_data(device);
Li Zefana815ab82008-04-18 13:27:29 -0700128 if (!*resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400129 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Patrick Mocheld550d982006-06-27 00:41:40 -0400131 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
133
Zhao Yakuia51e1452008-08-11 14:55:05 +0800134static int acpi_power_get_state(acpi_handle handle, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Len Brown4be44fc2005-08-05 00:44:28 -0400136 acpi_status status = AE_OK;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400137 unsigned long long sta = 0;
Lin Ming60a4ce72008-12-16 17:02:22 +0800138 char node_name[5];
139 struct acpi_buffer buffer = { sizeof(node_name), node_name };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Zhao Yakuia51e1452008-08-11 14:55:05 +0800142 if (!handle || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400143 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Zhao Yakuia51e1452008-08-11 14:55:05 +0800145 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400147 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400149 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
150 ACPI_POWER_RESOURCE_STATE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Lin Ming60a4ce72008-12-16 17:02:22 +0800152 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
Lin Ming60a4ce72008-12-16 17:02:22 +0800155 node_name,
Zhao Yakuib1b57fb2008-10-27 16:04:53 +0800156 *state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Patrick Mocheld550d982006-06-27 00:41:40 -0400158 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159}
160
Len Brown4be44fc2005-08-05 00:44:28 -0400161static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400163 int result = 0, state1;
Len Brown4be44fc2005-08-05 00:44:28 -0400164 u32 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167 if (!list || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400168 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 /* The state of the list is 'on' IFF all resources are 'on'. */
Zhao Yakuia51e1452008-08-11 14:55:05 +0800171 /* */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Len Brown4be44fc2005-08-05 00:44:28 -0400173 for (i = 0; i < list->count; i++) {
Zhao Yakuia51e1452008-08-11 14:55:05 +0800174 /*
175 * The state of the power resource can be obtained by
176 * using the ACPI handle. In such case it is unnecessary to
177 * get the Power resource first and then get its state again.
178 */
179 result = acpi_power_get_state(list->handles[i], &state1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400181 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400183 *state = state1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 if (*state != ACPI_POWER_RESOURCE_STATE_ON)
186 break;
187 }
188
189 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400190 *state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Patrick Mocheld550d982006-06-27 00:41:40 -0400192 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500195static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
Bjorn Helgaasbdf43bb2009-05-21 17:28:53 -0600197 int result = 0;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500198 int found = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400199 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500201 struct list_head *node, *next;
202 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 result = acpi_power_get_context(handle, &resource);
206 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400207 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500209 mutex_lock(&resource->resource_lock);
210 list_for_each_safe(node, next, &resource->reference) {
211 ref = container_of(node, struct acpi_power_reference, node);
212 if (dev->handle == ref->device->handle) {
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n",
214 dev->pnp.bus_id, resource->name));
215 found = 1;
216 break;
217 }
218 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500220 if (!found) {
221 ref = kmalloc(sizeof (struct acpi_power_reference),
222 irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL);
223 if (!ref) {
224 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n"));
225 mutex_unlock(&resource->resource_lock);
226 return -ENOMEM;
227 }
228 list_add_tail(&ref->node, &resource->reference);
229 ref->device = dev;
230 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n",
231 dev->pnp.bus_id, resource->name));
232 }
233 mutex_unlock(&resource->resource_lock);
234
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400235 status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400237 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 /* Update the power resource's _device_ power state */
Patrick Mochel41598572006-05-19 16:54:40 -0400240 resource->device->power.state = ACPI_STATE_D0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400243 resource->name));
Patrick Mocheld550d982006-06-27 00:41:40 -0400244 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
246
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500247static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
Bjorn Helgaasbdf43bb2009-05-21 17:28:53 -0600249 int result = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400250 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500252 struct list_head *node, *next;
253 struct acpi_power_reference *ref;
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 result = acpi_power_get_context(handle, &resource);
257 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400258 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500260 mutex_lock(&resource->resource_lock);
261 list_for_each_safe(node, next, &resource->reference) {
262 ref = container_of(node, struct acpi_power_reference, node);
263 if (dev->handle == ref->device->handle) {
264 list_del(&ref->node);
265 kfree(ref);
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n",
267 dev->pnp.bus_id, resource->name));
268 break;
269 }
270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500272 if (!list_empty(&resource->reference)) {
273 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n",
274 resource->name));
275 mutex_unlock(&resource->resource_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400276 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 }
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500278 mutex_unlock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400280 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400282 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 /* Update the power resource's _device_ power state */
Dmitry Torokhov786f18c2006-08-23 23:18:06 -0400285 resource->device->power.state = ACPI_STATE_D3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400288 resource->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Patrick Mocheld550d982006-06-27 00:41:40 -0400290 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200293/**
294 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
295 * ACPI 3.0) _PSW (Power State Wake)
296 * @dev: Device to handle.
297 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
298 * @sleep_state: Target sleep state of the system.
299 * @dev_state: Target power state of the device.
300 *
301 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
302 * State Wake) for the device, if present. On failure reset the device's
303 * wakeup.flags.valid flag.
304 *
305 * RETURN VALUE:
306 * 0 if either _DSW or _PSW has been successfully executed
307 * 0 if neither _DSW nor _PSW has been found
308 * -ENODEV if the execution of either _DSW or _PSW has failed
309 */
310int acpi_device_sleep_wake(struct acpi_device *dev,
311 int enable, int sleep_state, int dev_state)
312{
313 union acpi_object in_arg[3];
314 struct acpi_object_list arg_list = { 3, in_arg };
315 acpi_status status = AE_OK;
316
317 /*
318 * Try to execute _DSW first.
319 *
320 * Three agruments are needed for the _DSW object:
321 * Argument 0: enable/disable the wake capabilities
322 * Argument 1: target system state
323 * Argument 2: target device state
324 * When _DSW object is called to disable the wake capabilities, maybe
325 * the first argument is filled. The values of the other two agruments
326 * are meaningless.
327 */
328 in_arg[0].type = ACPI_TYPE_INTEGER;
329 in_arg[0].integer.value = enable;
330 in_arg[1].type = ACPI_TYPE_INTEGER;
331 in_arg[1].integer.value = sleep_state;
332 in_arg[2].type = ACPI_TYPE_INTEGER;
333 in_arg[2].integer.value = dev_state;
334 status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
335 if (ACPI_SUCCESS(status)) {
336 return 0;
337 } else if (status != AE_NOT_FOUND) {
338 printk(KERN_ERR PREFIX "_DSW execution failed\n");
339 dev->wakeup.flags.valid = 0;
340 return -ENODEV;
341 }
342
343 /* Execute _PSW */
344 arg_list.count = 1;
345 in_arg[0].integer.value = enable;
346 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
347 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
348 printk(KERN_ERR PREFIX "_PSW execution failed\n");
349 dev->wakeup.flags.valid = 0;
350 return -ENODEV;
351 }
352
353 return 0;
354}
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356/*
357 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
358 * 1. Power on the power resources required for the wakeup device
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200359 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
360 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 */
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200362int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200364 int i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200367 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200369 /*
370 * Do not execute the code below twice in a row without calling
371 * acpi_disable_wakeup_device_power() in between for the same device
372 */
373 if (dev->wakeup.flags.prepared)
374 return 0;
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 /* Open power resource */
377 for (i = 0; i < dev->wakeup.resources.count; i++) {
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200378 int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400380 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200382 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 }
384 }
385
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200386 /*
387 * Passing 3 as the third argument below means the device may be placed
388 * in arbitrary power state afterwards.
389 */
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200390 err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
391 if (!err)
392 dev->wakeup.flags.prepared = 1;
393
394 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395}
396
397/*
398 * Shutdown a wakeup device, counterpart of above method
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200399 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
400 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 * 2. Shutdown down the power resources
402 */
Len Brown4be44fc2005-08-05 00:44:28 -0400403int acpi_disable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404{
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200405 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200408 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200410 /*
411 * Do not execute the code below twice in a row without calling
412 * acpi_enable_wakeup_device_power() in between for the same device
413 */
414 if (!dev->wakeup.flags.prepared)
415 return 0;
416
417 dev->wakeup.flags.prepared = 0;
418
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200419 ret = acpi_device_sleep_wake(dev, 0, 0, 0);
420 if (ret)
421 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423 /* Close power resource */
424 for (i = 0; i < dev->wakeup.resources.count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500425 ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400427 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200429 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
431 }
432
Patrick Mocheld550d982006-06-27 00:41:40 -0400433 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434}
435
436/* --------------------------------------------------------------------------
437 Device Power Management
438 -------------------------------------------------------------------------- */
439
Len Brown4be44fc2005-08-05 00:44:28 -0400440int acpi_power_get_inferred_state(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
Len Brown4be44fc2005-08-05 00:44:28 -0400442 int result = 0;
443 struct acpi_handle_list *list = NULL;
444 int list_state = 0;
445 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
448 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400449 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
451 device->power.state = ACPI_STATE_UNKNOWN;
452
453 /*
454 * We know a device's inferred power state when all the resources
455 * required for a given D-state are 'on'.
456 */
Len Brown4be44fc2005-08-05 00:44:28 -0400457 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 list = &device->power.states[i].resources;
459 if (list->count < 1)
460 continue;
461
462 result = acpi_power_get_list_state(list, &list_state);
463 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400464 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
467 device->power.state = i;
Patrick Mocheld550d982006-06-27 00:41:40 -0400468 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 }
470 }
471
472 device->power.state = ACPI_STATE_D3;
473
Patrick Mocheld550d982006-06-27 00:41:40 -0400474 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475}
476
Len Brown4be44fc2005-08-05 00:44:28 -0400477int acpi_power_transition(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478{
Len Brown4be44fc2005-08-05 00:44:28 -0400479 int result = 0;
480 struct acpi_handle_list *cl = NULL; /* Current Resources */
481 struct acpi_handle_list *tl = NULL; /* Target Resources */
482 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400486 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Len Brown4be44fc2005-08-05 00:44:28 -0400488 if ((device->power.state < ACPI_STATE_D0)
489 || (device->power.state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400490 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492 cl = &device->power.states[device->power.state].resources;
493 tl = &device->power.states[state].resources;
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 /* TBD: Resources must be ordered. */
496
497 /*
498 * First we reference all power resources required in the target list
499 * (e.g. so the device doesn't lose power while transitioning).
500 */
Len Brown4be44fc2005-08-05 00:44:28 -0400501 for (i = 0; i < tl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500502 result = acpi_power_on(tl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 if (result)
504 goto end;
505 }
506
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500507 if (device->power.state == state) {
508 goto end;
509 }
510
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 /*
512 * Then we dereference all power resources used in the current list.
513 */
Len Brown4be44fc2005-08-05 00:44:28 -0400514 for (i = 0; i < cl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500515 result = acpi_power_off_device(cl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 if (result)
517 goto end;
518 }
519
Konstantin Karasyov72925762007-02-21 02:05:58 -0500520 end:
Miguel Botóne76d5f72008-02-04 23:31:19 -0800521 if (result)
Konstantin Karasyov72925762007-02-21 02:05:58 -0500522 device->power.state = ACPI_STATE_UNKNOWN;
Miguel Botóne76d5f72008-02-04 23:31:19 -0800523 else {
Konstantin Karasyov72925762007-02-21 02:05:58 -0500524 /* We shouldn't change the state till all above operations succeed */
525 device->power.state = state;
526 }
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/* --------------------------------------------------------------------------
532 FS Interface (/proc)
533 -------------------------------------------------------------------------- */
534
Len Brown4be44fc2005-08-05 00:44:28 -0400535static struct proc_dir_entry *acpi_power_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537static int acpi_power_seq_show(struct seq_file *seq, void *offset)
538{
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500539 int count = 0;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400540 int result = 0, state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500542 struct list_head *node, *next;
543 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200546 resource = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
548 if (!resource)
549 goto end;
550
Zhao Yakuia51e1452008-08-11 14:55:05 +0800551 result = acpi_power_get_state(resource->device->handle, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500552 if (result)
553 goto end;
554
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 seq_puts(seq, "state: ");
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400556 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 case ACPI_POWER_RESOURCE_STATE_ON:
558 seq_puts(seq, "on\n");
559 break;
560 case ACPI_POWER_RESOURCE_STATE_OFF:
561 seq_puts(seq, "off\n");
562 break;
563 default:
564 seq_puts(seq, "unknown\n");
565 break;
566 }
567
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500568 mutex_lock(&resource->resource_lock);
569 list_for_each_safe(node, next, &resource->reference) {
570 ref = container_of(node, struct acpi_power_reference, node);
571 count++;
572 }
573 mutex_unlock(&resource->resource_lock);
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 seq_printf(seq, "system level: S%d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400576 "order: %d\n"
577 "reference count: %d\n",
578 resource->system_level,
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500579 resource->order, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Len Brown4be44fc2005-08-05 00:44:28 -0400581 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400582 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
584
585static int acpi_power_open_fs(struct inode *inode, struct file *file)
586{
587 return single_open(file, acpi_power_seq_show, PDE(inode)->data);
588}
589
Len Brown4be44fc2005-08-05 00:44:28 -0400590static int acpi_power_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
Len Brown4be44fc2005-08-05 00:44:28 -0400592 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400596 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
598 if (!acpi_device_dir(device)) {
599 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400600 acpi_power_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400602 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 }
604
605 /* 'status' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700606 entry = proc_create_data(ACPI_POWER_FILE_STATUS,
607 S_IRUGO, acpi_device_dir(device),
608 &acpi_power_fops, acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400610 return -EIO;
Patrick Mocheld550d982006-06-27 00:41:40 -0400611 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612}
613
Len Brown4be44fc2005-08-05 00:44:28 -0400614static int acpi_power_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
617 if (acpi_device_dir(device)) {
618 remove_proc_entry(ACPI_POWER_FILE_STATUS,
619 acpi_device_dir(device));
620 remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
621 acpi_device_dir(device) = NULL;
622 }
623
Patrick Mocheld550d982006-06-27 00:41:40 -0400624 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627/* --------------------------------------------------------------------------
628 Driver Interface
629 -------------------------------------------------------------------------- */
630
Len Brown4be44fc2005-08-05 00:44:28 -0400631static int acpi_power_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400633 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400634 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400636 union acpi_object acpi_object;
637 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400641 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Burman Yan36bcbec2006-12-19 12:56:11 -0800643 resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400645 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
Patrick Mochel41598572006-05-19 16:54:40 -0400647 resource->device = device;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500648 mutex_init(&resource->resource_lock);
649 INIT_LIST_HEAD(&resource->reference);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 strcpy(resource->name, device->pnp.bus_id);
651 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
652 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700653 device->driver_data = resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655 /* Evalute the object to get the system level and resource order. */
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400656 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (ACPI_FAILURE(status)) {
658 result = -ENODEV;
659 goto end;
660 }
661 resource->system_level = acpi_object.power_resource.system_level;
662 resource->order = acpi_object.power_resource.resource_order;
663
Zhao Yakuia51e1452008-08-11 14:55:05 +0800664 result = acpi_power_get_state(device->handle, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 if (result)
666 goto end;
667
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400668 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 case ACPI_POWER_RESOURCE_STATE_ON:
670 device->power.state = ACPI_STATE_D0;
671 break;
672 case ACPI_POWER_RESOURCE_STATE_OFF:
673 device->power.state = ACPI_STATE_D3;
674 break;
675 default:
676 device->power.state = ACPI_STATE_UNKNOWN;
677 break;
678 }
679
680 result = acpi_power_add_fs(device);
681 if (result)
682 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Len Brown4be44fc2005-08-05 00:44:28 -0400684 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400685 acpi_device_bid(device), state ? "on" : "off");
Len Brown4be44fc2005-08-05 00:44:28 -0400686
687 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 if (result)
689 kfree(resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400690
Patrick Mocheld550d982006-06-27 00:41:40 -0400691 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692}
693
Len Brown4be44fc2005-08-05 00:44:28 -0400694static int acpi_power_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
696 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500697 struct list_head *node, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400701 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200703 resource = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
705 acpi_power_remove_fs(device);
706
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500707 mutex_lock(&resource->resource_lock);
708 list_for_each_safe(node, next, &resource->reference) {
709 struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node);
710 list_del(&ref->node);
711 kfree(ref);
712 }
713 mutex_unlock(&resource->resource_lock);
714
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 kfree(resource);
716
Patrick Mocheld550d982006-06-27 00:41:40 -0400717 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718}
719
Len Browne8363f32007-02-16 02:05:39 -0500720static int acpi_power_resume(struct acpi_device *device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500721{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400722 int result = 0, state;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500723 struct acpi_power_resource *resource = NULL;
724 struct acpi_power_reference *ref;
725
726 if (!device || !acpi_driver_data(device))
727 return -EINVAL;
728
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700729 resource = acpi_driver_data(device);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500730
Zhao Yakuia51e1452008-08-11 14:55:05 +0800731 result = acpi_power_get_state(device->handle, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500732 if (result)
733 return result;
734
735 mutex_lock(&resource->resource_lock);
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400736 if (state == ACPI_POWER_RESOURCE_STATE_OFF &&
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500737 !list_empty(&resource->reference)) {
738 ref = container_of(resource->reference.next, struct acpi_power_reference, node);
739 mutex_unlock(&resource->resource_lock);
740 result = acpi_power_on(device->handle, ref->device);
741 return result;
742 }
743
744 mutex_unlock(&resource->resource_lock);
745 return 0;
746}
747
Bjorn Helgaas44515372009-03-24 16:49:53 -0600748int __init acpi_power_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749{
Len Brown4be44fc2005-08-05 00:44:28 -0400750 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 INIT_LIST_HEAD(&acpi_power_resource_list);
753
754 acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
755 if (!acpi_power_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400756 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758 result = acpi_bus_register_driver(&acpi_power_driver);
759 if (result < 0) {
760 remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -0400761 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 }
763
Patrick Mocheld550d982006-06-27 00:41:40 -0400764 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765}