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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 <linux/proc_fs.h>
44#include <linux/seq_file.h>
45#include <acpi/acpi_bus.h>
46#include <acpi/acpi_drivers.h>
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +020047#include "sleep.h"
48
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
Zhao Yakuif5adfaa2008-08-11 14:57:50 +080061int acpi_power_nocheck;
62module_param_named(power_nocheck, acpi_power_nocheck, bool, 000);
63
Len Brown4be44fc2005-08-05 00:44:28 -040064static int acpi_power_add(struct acpi_device *device);
65static int acpi_power_remove(struct acpi_device *device, int type);
Len Browne8363f32007-02-16 02:05:39 -050066static int acpi_power_resume(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067static int acpi_power_open_fs(struct inode *inode, struct file *file);
68
Márton Némethc97adf92010-01-10 17:15:36 +010069static const struct acpi_device_id power_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020070 {ACPI_POWER_HID, 0},
71 {"", 0},
72};
73MODULE_DEVICE_TABLE(acpi, power_device_ids);
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075static struct acpi_driver acpi_power_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050076 .name = "power",
Len Brown4be44fc2005-08-05 00:44:28 -040077 .class = ACPI_POWER_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020078 .ids = power_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040079 .ops = {
80 .add = acpi_power_add,
81 .remove = acpi_power_remove,
Konstantin Karasyov0a613902007-02-16 01:47:06 -050082 .resume = acpi_power_resume,
Len Brown4be44fc2005-08-05 00:44:28 -040083 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070084};
85
Konstantin Karasyov0a613902007-02-16 01:47:06 -050086struct acpi_power_reference {
87 struct list_head node;
88 struct acpi_device *device;
89};
90
Len Brown4be44fc2005-08-05 00:44:28 -040091struct acpi_power_resource {
Patrick Mochel41598572006-05-19 16:54:40 -040092 struct acpi_device * device;
Len Brown4be44fc2005-08-05 00:44:28 -040093 acpi_bus_id name;
94 u32 system_level;
95 u32 order;
Konstantin Karasyov0a613902007-02-16 01:47:06 -050096 struct mutex resource_lock;
97 struct list_head reference;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098};
99
Len Brown4be44fc2005-08-05 00:44:28 -0400100static struct list_head acpi_power_resource_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Arjan van de Vend7508032006-07-04 13:06:00 -0400102static const struct file_operations acpi_power_fops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700103 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -0400104 .open = acpi_power_open_fs,
105 .read = seq_read,
106 .llseek = seq_lseek,
107 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108};
109
110/* --------------------------------------------------------------------------
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{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400167 int result = 0, state1;
Len Brown4be44fc2005-08-05 00:44:28 -0400168 u32 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 if (!list || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400172 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 /* The state of the list is 'on' IFF all resources are 'on'. */
175
Len Brown4be44fc2005-08-05 00:44:28 -0400176 for (i = 0; i < list->count; i++) {
Zhao Yakuia51e1452008-08-11 14:55:05 +0800177 /*
178 * The state of the power resource can be obtained by
179 * using the ACPI handle. In such case it is unnecessary to
180 * get the Power resource first and then get its state again.
181 */
182 result = acpi_power_get_state(list->handles[i], &state1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400184 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400186 *state = state1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188 if (*state != ACPI_POWER_RESOURCE_STATE_ON)
189 break;
190 }
191
192 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400193 *state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Patrick Mocheld550d982006-06-27 00:41:40 -0400195 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
197
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500198static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
Bjorn Helgaasbdf43bb2009-05-21 17:28:53 -0600200 int result = 0;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500201 int found = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400202 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500204 struct list_head *node, *next;
205 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 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);
213 list_for_each_safe(node, next, &resource->reference) {
214 ref = container_of(node, struct acpi_power_reference, node);
215 if (dev->handle == ref->device->handle) {
216 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n",
217 dev->pnp.bus_id, resource->name));
218 found = 1;
219 break;
220 }
221 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500223 if (!found) {
224 ref = kmalloc(sizeof (struct acpi_power_reference),
225 irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL);
226 if (!ref) {
227 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n"));
228 mutex_unlock(&resource->resource_lock);
229 return -ENOMEM;
230 }
231 list_add_tail(&ref->node, &resource->reference);
232 ref->device = dev;
233 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n",
234 dev->pnp.bus_id, resource->name));
235 }
236 mutex_unlock(&resource->resource_lock);
237
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400238 status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400240 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 /* Update the power resource's _device_ power state */
Patrick Mochel41598572006-05-19 16:54:40 -0400243 resource->device->power.state = ACPI_STATE_D0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400246 resource->name));
Patrick Mocheld550d982006-06-27 00:41:40 -0400247 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}
249
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500250static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251{
Bjorn Helgaasbdf43bb2009-05-21 17:28:53 -0600252 int result = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400253 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500255 struct list_head *node, *next;
256 struct acpi_power_reference *ref;
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 result = acpi_power_get_context(handle, &resource);
260 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400261 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500263 mutex_lock(&resource->resource_lock);
264 list_for_each_safe(node, next, &resource->reference) {
265 ref = container_of(node, struct acpi_power_reference, node);
266 if (dev->handle == ref->device->handle) {
267 list_del(&ref->node);
268 kfree(ref);
269 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n",
270 dev->pnp.bus_id, resource->name));
271 break;
272 }
273 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500275 if (!list_empty(&resource->reference)) {
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n",
277 resource->name));
278 mutex_unlock(&resource->resource_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400279 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 }
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500281 mutex_unlock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400283 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400285 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 /* Update the power resource's _device_ power state */
Dmitry Torokhov786f18c2006-08-23 23:18:06 -0400288 resource->device->power.state = ACPI_STATE_D3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400291 resource->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Patrick Mocheld550d982006-06-27 00:41:40 -0400293 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200296/**
297 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
298 * ACPI 3.0) _PSW (Power State Wake)
299 * @dev: Device to handle.
300 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
301 * @sleep_state: Target sleep state of the system.
302 * @dev_state: Target power state of the device.
303 *
304 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
305 * State Wake) for the device, if present. On failure reset the device's
306 * wakeup.flags.valid flag.
307 *
308 * RETURN VALUE:
309 * 0 if either _DSW or _PSW has been successfully executed
310 * 0 if neither _DSW nor _PSW has been found
311 * -ENODEV if the execution of either _DSW or _PSW has failed
312 */
313int acpi_device_sleep_wake(struct acpi_device *dev,
314 int enable, int sleep_state, int dev_state)
315{
316 union acpi_object in_arg[3];
317 struct acpi_object_list arg_list = { 3, in_arg };
318 acpi_status status = AE_OK;
319
320 /*
321 * Try to execute _DSW first.
322 *
323 * Three agruments are needed for the _DSW object:
324 * Argument 0: enable/disable the wake capabilities
325 * Argument 1: target system state
326 * Argument 2: target device state
327 * When _DSW object is called to disable the wake capabilities, maybe
328 * the first argument is filled. The values of the other two agruments
329 * are meaningless.
330 */
331 in_arg[0].type = ACPI_TYPE_INTEGER;
332 in_arg[0].integer.value = enable;
333 in_arg[1].type = ACPI_TYPE_INTEGER;
334 in_arg[1].integer.value = sleep_state;
335 in_arg[2].type = ACPI_TYPE_INTEGER;
336 in_arg[2].integer.value = dev_state;
337 status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
338 if (ACPI_SUCCESS(status)) {
339 return 0;
340 } else if (status != AE_NOT_FOUND) {
341 printk(KERN_ERR PREFIX "_DSW execution failed\n");
342 dev->wakeup.flags.valid = 0;
343 return -ENODEV;
344 }
345
346 /* Execute _PSW */
347 arg_list.count = 1;
348 in_arg[0].integer.value = enable;
349 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
350 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
351 printk(KERN_ERR PREFIX "_PSW execution failed\n");
352 dev->wakeup.flags.valid = 0;
353 return -ENODEV;
354 }
355
356 return 0;
357}
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359/*
360 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
361 * 1. Power on the power resources required for the wakeup device
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200362 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
363 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 */
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200365int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200367 int i, err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200370 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200372 mutex_lock(&acpi_device_lock);
373
374 if (dev->wakeup.prepare_count++)
375 goto out;
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 /* Open power resource */
378 for (i = 0; i < dev->wakeup.resources.count; i++) {
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200379 int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400381 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200383 err = -ENODEV;
384 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 }
386 }
387
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200388 /*
389 * Passing 3 as the third argument below means the device may be placed
390 * in arbitrary power state afterwards.
391 */
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200392 err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200393
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200394 err_out:
395 if (err)
396 dev->wakeup.prepare_count = 0;
397
398 out:
399 mutex_unlock(&acpi_device_lock);
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200400 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401}
402
403/*
404 * Shutdown a wakeup device, counterpart of above method
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200405 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
406 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 * 2. Shutdown down the power resources
408 */
Len Brown4be44fc2005-08-05 00:44:28 -0400409int acpi_disable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200411 int i, err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
413 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200414 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200416 mutex_lock(&acpi_device_lock);
417
418 if (--dev->wakeup.prepare_count > 0)
419 goto out;
420
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200421 /*
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200422 * Executing the code below even if prepare_count is already zero when
423 * the function is called may be useful, for example for initialisation.
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200424 */
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200425 if (dev->wakeup.prepare_count < 0)
426 dev->wakeup.prepare_count = 0;
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200427
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200428 err = acpi_device_sleep_wake(dev, 0, 0, 0);
429 if (err)
430 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 /* Close power resource */
433 for (i = 0; i < dev->wakeup.resources.count; i++) {
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200434 int ret = acpi_power_off_device(
435 dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400437 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200439 err = -ENODEV;
440 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 }
442 }
443
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200444 out:
445 mutex_unlock(&acpi_device_lock);
446 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447}
448
449/* --------------------------------------------------------------------------
450 Device Power Management
451 -------------------------------------------------------------------------- */
452
Len Brown4be44fc2005-08-05 00:44:28 -0400453int acpi_power_get_inferred_state(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
Len Brown4be44fc2005-08-05 00:44:28 -0400455 int result = 0;
456 struct acpi_handle_list *list = NULL;
457 int list_state = 0;
458 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400462 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
464 device->power.state = ACPI_STATE_UNKNOWN;
465
466 /*
467 * We know a device's inferred power state when all the resources
468 * required for a given D-state are 'on'.
469 */
Len Brown4be44fc2005-08-05 00:44:28 -0400470 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 list = &device->power.states[i].resources;
472 if (list->count < 1)
473 continue;
474
475 result = acpi_power_get_list_state(list, &list_state);
476 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400477 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
480 device->power.state = i;
Patrick Mocheld550d982006-06-27 00:41:40 -0400481 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
483 }
484
485 device->power.state = ACPI_STATE_D3;
486
Patrick Mocheld550d982006-06-27 00:41:40 -0400487 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488}
489
Len Brown4be44fc2005-08-05 00:44:28 -0400490int acpi_power_transition(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491{
Len Brown4be44fc2005-08-05 00:44:28 -0400492 int result = 0;
493 struct acpi_handle_list *cl = NULL; /* Current Resources */
494 struct acpi_handle_list *tl = NULL; /* Target Resources */
495 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
498 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400499 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
Len Brown4be44fc2005-08-05 00:44:28 -0400501 if ((device->power.state < ACPI_STATE_D0)
502 || (device->power.state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400503 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 cl = &device->power.states[device->power.state].resources;
506 tl = &device->power.states[state].resources;
507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 /* TBD: Resources must be ordered. */
509
510 /*
511 * First we reference all power resources required in the target list
512 * (e.g. so the device doesn't lose power while transitioning).
513 */
Len Brown4be44fc2005-08-05 00:44:28 -0400514 for (i = 0; i < tl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500515 result = acpi_power_on(tl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 if (result)
517 goto end;
518 }
519
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500520 if (device->power.state == state) {
521 goto end;
522 }
523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 /*
525 * Then we dereference all power resources used in the current list.
526 */
Len Brown4be44fc2005-08-05 00:44:28 -0400527 for (i = 0; i < cl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500528 result = acpi_power_off_device(cl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 if (result)
530 goto end;
531 }
532
Konstantin Karasyov72925762007-02-21 02:05:58 -0500533 end:
Miguel Botóne76d5f72008-02-04 23:31:19 -0800534 if (result)
Konstantin Karasyov72925762007-02-21 02:05:58 -0500535 device->power.state = ACPI_STATE_UNKNOWN;
Miguel Botóne76d5f72008-02-04 23:31:19 -0800536 else {
Konstantin Karasyov72925762007-02-21 02:05:58 -0500537 /* We shouldn't change the state till all above operations succeed */
538 device->power.state = state;
539 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Patrick Mocheld550d982006-06-27 00:41:40 -0400541 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542}
543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544/* --------------------------------------------------------------------------
545 FS Interface (/proc)
546 -------------------------------------------------------------------------- */
547
Len Brown4be44fc2005-08-05 00:44:28 -0400548static struct proc_dir_entry *acpi_power_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550static int acpi_power_seq_show(struct seq_file *seq, void *offset)
551{
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500552 int count = 0;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400553 int result = 0, state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500555 struct list_head *node, *next;
556 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200559 resource = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
561 if (!resource)
562 goto end;
563
Zhao Yakuia51e1452008-08-11 14:55:05 +0800564 result = acpi_power_get_state(resource->device->handle, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500565 if (result)
566 goto end;
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 seq_puts(seq, "state: ");
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400569 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 case ACPI_POWER_RESOURCE_STATE_ON:
571 seq_puts(seq, "on\n");
572 break;
573 case ACPI_POWER_RESOURCE_STATE_OFF:
574 seq_puts(seq, "off\n");
575 break;
576 default:
577 seq_puts(seq, "unknown\n");
578 break;
579 }
580
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500581 mutex_lock(&resource->resource_lock);
582 list_for_each_safe(node, next, &resource->reference) {
583 ref = container_of(node, struct acpi_power_reference, node);
584 count++;
585 }
586 mutex_unlock(&resource->resource_lock);
587
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 seq_printf(seq, "system level: S%d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400589 "order: %d\n"
590 "reference count: %d\n",
591 resource->system_level,
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500592 resource->order, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Len Brown4be44fc2005-08-05 00:44:28 -0400594 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400595 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596}
597
598static int acpi_power_open_fs(struct inode *inode, struct file *file)
599{
600 return single_open(file, acpi_power_seq_show, PDE(inode)->data);
601}
602
Len Brown4be44fc2005-08-05 00:44:28 -0400603static int acpi_power_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604{
Len Brown4be44fc2005-08-05 00:44:28 -0400605 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
608 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400609 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 if (!acpi_device_dir(device)) {
612 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400613 acpi_power_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400615 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 }
617
618 /* 'status' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700619 entry = proc_create_data(ACPI_POWER_FILE_STATUS,
620 S_IRUGO, acpi_device_dir(device),
621 &acpi_power_fops, acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400623 return -EIO;
Patrick Mocheld550d982006-06-27 00:41:40 -0400624 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
Len Brown4be44fc2005-08-05 00:44:28 -0400627static int acpi_power_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630 if (acpi_device_dir(device)) {
631 remove_proc_entry(ACPI_POWER_FILE_STATUS,
632 acpi_device_dir(device));
633 remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
634 acpi_device_dir(device) = NULL;
635 }
636
Patrick Mocheld550d982006-06-27 00:41:40 -0400637 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640/* --------------------------------------------------------------------------
641 Driver Interface
642 -------------------------------------------------------------------------- */
643
Len Brown4be44fc2005-08-05 00:44:28 -0400644static int acpi_power_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400646 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400647 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400649 union acpi_object acpi_object;
650 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400654 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Burman Yan36bcbec2006-12-19 12:56:11 -0800656 resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400658 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Patrick Mochel41598572006-05-19 16:54:40 -0400660 resource->device = device;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500661 mutex_init(&resource->resource_lock);
662 INIT_LIST_HEAD(&resource->reference);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 strcpy(resource->name, device->pnp.bus_id);
664 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
665 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700666 device->driver_data = resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 /* Evalute the object to get the system level and resource order. */
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400669 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 if (ACPI_FAILURE(status)) {
671 result = -ENODEV;
672 goto end;
673 }
674 resource->system_level = acpi_object.power_resource.system_level;
675 resource->order = acpi_object.power_resource.resource_order;
676
Zhao Yakuia51e1452008-08-11 14:55:05 +0800677 result = acpi_power_get_state(device->handle, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 if (result)
679 goto end;
680
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400681 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 case ACPI_POWER_RESOURCE_STATE_ON:
683 device->power.state = ACPI_STATE_D0;
684 break;
685 case ACPI_POWER_RESOURCE_STATE_OFF:
686 device->power.state = ACPI_STATE_D3;
687 break;
688 default:
689 device->power.state = ACPI_STATE_UNKNOWN;
690 break;
691 }
692
693 result = acpi_power_add_fs(device);
694 if (result)
695 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Len Brown4be44fc2005-08-05 00:44:28 -0400697 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400698 acpi_device_bid(device), state ? "on" : "off");
Len Brown4be44fc2005-08-05 00:44:28 -0400699
700 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (result)
702 kfree(resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400703
Patrick Mocheld550d982006-06-27 00:41:40 -0400704 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705}
706
Len Brown4be44fc2005-08-05 00:44:28 -0400707static int acpi_power_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
709 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500710 struct list_head *node, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400714 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200716 resource = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 acpi_power_remove_fs(device);
719
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500720 mutex_lock(&resource->resource_lock);
721 list_for_each_safe(node, next, &resource->reference) {
722 struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node);
723 list_del(&ref->node);
724 kfree(ref);
725 }
726 mutex_unlock(&resource->resource_lock);
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 kfree(resource);
729
Patrick Mocheld550d982006-06-27 00:41:40 -0400730 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731}
732
Len Browne8363f32007-02-16 02:05:39 -0500733static int acpi_power_resume(struct acpi_device *device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500734{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400735 int result = 0, state;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500736 struct acpi_power_resource *resource = NULL;
737 struct acpi_power_reference *ref;
738
739 if (!device || !acpi_driver_data(device))
740 return -EINVAL;
741
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700742 resource = acpi_driver_data(device);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500743
Zhao Yakuia51e1452008-08-11 14:55:05 +0800744 result = acpi_power_get_state(device->handle, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500745 if (result)
746 return result;
747
748 mutex_lock(&resource->resource_lock);
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400749 if (state == ACPI_POWER_RESOURCE_STATE_OFF &&
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500750 !list_empty(&resource->reference)) {
751 ref = container_of(resource->reference.next, struct acpi_power_reference, node);
752 mutex_unlock(&resource->resource_lock);
753 result = acpi_power_on(device->handle, ref->device);
754 return result;
755 }
756
757 mutex_unlock(&resource->resource_lock);
758 return 0;
759}
760
Bjorn Helgaas44515372009-03-24 16:49:53 -0600761int __init acpi_power_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762{
Len Brown4be44fc2005-08-05 00:44:28 -0400763 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 INIT_LIST_HEAD(&acpi_power_resource_list);
766
767 acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
768 if (!acpi_power_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400769 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
771 result = acpi_bus_register_driver(&acpi_power_driver);
772 if (result < 0) {
773 remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -0400774 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 }
776
Patrick Mocheld550d982006-06-27 00:41:40 -0400777 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778}