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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
57#ifdef MODULE_PARAM_PREFIX
58#undef MODULE_PARAM_PREFIX
59#endif
60#define MODULE_PARAM_PREFIX "acpi."
61int 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
Thomas Renninger1ba90e32007-07-23 14:44:41 +020069static struct acpi_device_id power_device_ids[] = {
70 {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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Zhao Yakuia51e1452008-08-11 14:55:05 +0800144 if (!handle || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400145 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Zhao Yakuia51e1452008-08-11 14:55:05 +0800147 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400149 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400151 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
152 ACPI_POWER_RESOURCE_STATE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
Zhao Yakuib1b57fb2008-10-27 16:04:53 +0800155 acpi_ut_get_node_name(handle),
156 *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{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400197 int result = 0, state;
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
Zhao Yakuif5adfaa2008-08-11 14:57:50 +0800239 if (!acpi_power_nocheck) {
240 /*
241 * If acpi_power_nocheck is set, it is unnecessary to check
242 * the power state after power transition.
243 */
244 result = acpi_power_get_state(resource->device->handle,
245 &state);
246 if (result)
247 return result;
248 if (state != ACPI_POWER_RESOURCE_STATE_ON)
249 return -ENOEXEC;
250 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 /* Update the power resource's _device_ power state */
Patrick Mochel41598572006-05-19 16:54:40 -0400252 resource->device->power.state = ACPI_STATE_D0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400255 resource->name));
Patrick Mocheld550d982006-06-27 00:41:40 -0400256 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257}
258
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500259static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400261 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400262 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500264 struct list_head *node, *next;
265 struct acpi_power_reference *ref;
266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 result = acpi_power_get_context(handle, &resource);
269 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400270 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500272 mutex_lock(&resource->resource_lock);
273 list_for_each_safe(node, next, &resource->reference) {
274 ref = container_of(node, struct acpi_power_reference, node);
275 if (dev->handle == ref->device->handle) {
276 list_del(&ref->node);
277 kfree(ref);
278 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n",
279 dev->pnp.bus_id, resource->name));
280 break;
281 }
282 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500284 if (!list_empty(&resource->reference)) {
285 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n",
286 resource->name));
287 mutex_unlock(&resource->resource_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400288 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 }
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500290 mutex_unlock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400292 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400294 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Zhao Yakuif5adfaa2008-08-11 14:57:50 +0800296 if (!acpi_power_nocheck) {
297 /*
298 * If acpi_power_nocheck is set, it is unnecessary to check
299 * the power state after power transition.
300 */
301 result = acpi_power_get_state(handle, &state);
302 if (result)
303 return result;
304 if (state != ACPI_POWER_RESOURCE_STATE_OFF)
305 return -ENOEXEC;
306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
308 /* Update the power resource's _device_ power state */
Dmitry Torokhov786f18c2006-08-23 23:18:06 -0400309 resource->device->power.state = ACPI_STATE_D3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
311 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400312 resource->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Patrick Mocheld550d982006-06-27 00:41:40 -0400314 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315}
316
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200317/**
318 * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
319 * ACPI 3.0) _PSW (Power State Wake)
320 * @dev: Device to handle.
321 * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
322 * @sleep_state: Target sleep state of the system.
323 * @dev_state: Target power state of the device.
324 *
325 * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
326 * State Wake) for the device, if present. On failure reset the device's
327 * wakeup.flags.valid flag.
328 *
329 * RETURN VALUE:
330 * 0 if either _DSW or _PSW has been successfully executed
331 * 0 if neither _DSW nor _PSW has been found
332 * -ENODEV if the execution of either _DSW or _PSW has failed
333 */
334int acpi_device_sleep_wake(struct acpi_device *dev,
335 int enable, int sleep_state, int dev_state)
336{
337 union acpi_object in_arg[3];
338 struct acpi_object_list arg_list = { 3, in_arg };
339 acpi_status status = AE_OK;
340
341 /*
342 * Try to execute _DSW first.
343 *
344 * Three agruments are needed for the _DSW object:
345 * Argument 0: enable/disable the wake capabilities
346 * Argument 1: target system state
347 * Argument 2: target device state
348 * When _DSW object is called to disable the wake capabilities, maybe
349 * the first argument is filled. The values of the other two agruments
350 * are meaningless.
351 */
352 in_arg[0].type = ACPI_TYPE_INTEGER;
353 in_arg[0].integer.value = enable;
354 in_arg[1].type = ACPI_TYPE_INTEGER;
355 in_arg[1].integer.value = sleep_state;
356 in_arg[2].type = ACPI_TYPE_INTEGER;
357 in_arg[2].integer.value = dev_state;
358 status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
359 if (ACPI_SUCCESS(status)) {
360 return 0;
361 } else if (status != AE_NOT_FOUND) {
362 printk(KERN_ERR PREFIX "_DSW execution failed\n");
363 dev->wakeup.flags.valid = 0;
364 return -ENODEV;
365 }
366
367 /* Execute _PSW */
368 arg_list.count = 1;
369 in_arg[0].integer.value = enable;
370 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
371 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
372 printk(KERN_ERR PREFIX "_PSW execution failed\n");
373 dev->wakeup.flags.valid = 0;
374 return -ENODEV;
375 }
376
377 return 0;
378}
379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380/*
381 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
382 * 1. Power on the power resources required for the wakeup device
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200383 * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
384 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 */
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200386int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200388 int i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200391 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200393 /*
394 * Do not execute the code below twice in a row without calling
395 * acpi_disable_wakeup_device_power() in between for the same device
396 */
397 if (dev->wakeup.flags.prepared)
398 return 0;
399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 /* Open power resource */
401 for (i = 0; i < dev->wakeup.resources.count; i++) {
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200402 int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400404 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200406 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
408 }
409
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200410 /*
411 * Passing 3 as the third argument below means the device may be placed
412 * in arbitrary power state afterwards.
413 */
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200414 err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
415 if (!err)
416 dev->wakeup.flags.prepared = 1;
417
418 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419}
420
421/*
422 * Shutdown a wakeup device, counterpart of above method
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200423 * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
424 * State Wake) for the device, if present
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 * 2. Shutdown down the power resources
426 */
Len Brown4be44fc2005-08-05 00:44:28 -0400427int acpi_disable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200429 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 if (!dev || !dev->wakeup.flags.valid)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200432 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
Rafael J. Wysocki0af4b8c2008-07-07 03:34:11 +0200434 /*
435 * Do not execute the code below twice in a row without calling
436 * acpi_enable_wakeup_device_power() in between for the same device
437 */
438 if (!dev->wakeup.flags.prepared)
439 return 0;
440
441 dev->wakeup.flags.prepared = 0;
442
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200443 ret = acpi_device_sleep_wake(dev, 0, 0, 0);
444 if (ret)
445 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447 /* Close power resource */
448 for (i = 0; i < dev->wakeup.resources.count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500449 ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400451 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 dev->wakeup.flags.valid = 0;
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200453 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 }
455 }
456
Patrick Mocheld550d982006-06-27 00:41:40 -0400457 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459
460/* --------------------------------------------------------------------------
461 Device Power Management
462 -------------------------------------------------------------------------- */
463
Len Brown4be44fc2005-08-05 00:44:28 -0400464int acpi_power_get_inferred_state(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
Len Brown4be44fc2005-08-05 00:44:28 -0400466 int result = 0;
467 struct acpi_handle_list *list = NULL;
468 int list_state = 0;
469 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400473 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 device->power.state = ACPI_STATE_UNKNOWN;
476
477 /*
478 * We know a device's inferred power state when all the resources
479 * required for a given D-state are 'on'.
480 */
Len Brown4be44fc2005-08-05 00:44:28 -0400481 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 list = &device->power.states[i].resources;
483 if (list->count < 1)
484 continue;
485
486 result = acpi_power_get_list_state(list, &list_state);
487 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400488 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
490 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
491 device->power.state = i;
Patrick Mocheld550d982006-06-27 00:41:40 -0400492 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 }
494 }
495
496 device->power.state = ACPI_STATE_D3;
497
Patrick Mocheld550d982006-06-27 00:41:40 -0400498 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499}
500
Len Brown4be44fc2005-08-05 00:44:28 -0400501int acpi_power_transition(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502{
Len Brown4be44fc2005-08-05 00:44:28 -0400503 int result = 0;
504 struct acpi_handle_list *cl = NULL; /* Current Resources */
505 struct acpi_handle_list *tl = NULL; /* Target Resources */
506 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400510 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
Len Brown4be44fc2005-08-05 00:44:28 -0400512 if ((device->power.state < ACPI_STATE_D0)
513 || (device->power.state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400514 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516 cl = &device->power.states[device->power.state].resources;
517 tl = &device->power.states[state].resources;
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 /* TBD: Resources must be ordered. */
520
521 /*
522 * First we reference all power resources required in the target list
523 * (e.g. so the device doesn't lose power while transitioning).
524 */
Len Brown4be44fc2005-08-05 00:44:28 -0400525 for (i = 0; i < tl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500526 result = acpi_power_on(tl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 if (result)
528 goto end;
529 }
530
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500531 if (device->power.state == state) {
532 goto end;
533 }
534
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 /*
536 * Then we dereference all power resources used in the current list.
537 */
Len Brown4be44fc2005-08-05 00:44:28 -0400538 for (i = 0; i < cl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500539 result = acpi_power_off_device(cl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (result)
541 goto end;
542 }
543
Konstantin Karasyov72925762007-02-21 02:05:58 -0500544 end:
Miguel Botóne76d5f72008-02-04 23:31:19 -0800545 if (result)
Konstantin Karasyov72925762007-02-21 02:05:58 -0500546 device->power.state = ACPI_STATE_UNKNOWN;
Miguel Botóne76d5f72008-02-04 23:31:19 -0800547 else {
Konstantin Karasyov72925762007-02-21 02:05:58 -0500548 /* We shouldn't change the state till all above operations succeed */
549 device->power.state = state;
550 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Patrick Mocheld550d982006-06-27 00:41:40 -0400552 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555/* --------------------------------------------------------------------------
556 FS Interface (/proc)
557 -------------------------------------------------------------------------- */
558
Len Brown4be44fc2005-08-05 00:44:28 -0400559static struct proc_dir_entry *acpi_power_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
561static int acpi_power_seq_show(struct seq_file *seq, void *offset)
562{
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500563 int count = 0;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400564 int result = 0, state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500566 struct list_head *node, *next;
567 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200570 resource = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
572 if (!resource)
573 goto end;
574
Zhao Yakuia51e1452008-08-11 14:55:05 +0800575 result = acpi_power_get_state(resource->device->handle, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500576 if (result)
577 goto end;
578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 seq_puts(seq, "state: ");
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400580 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 case ACPI_POWER_RESOURCE_STATE_ON:
582 seq_puts(seq, "on\n");
583 break;
584 case ACPI_POWER_RESOURCE_STATE_OFF:
585 seq_puts(seq, "off\n");
586 break;
587 default:
588 seq_puts(seq, "unknown\n");
589 break;
590 }
591
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500592 mutex_lock(&resource->resource_lock);
593 list_for_each_safe(node, next, &resource->reference) {
594 ref = container_of(node, struct acpi_power_reference, node);
595 count++;
596 }
597 mutex_unlock(&resource->resource_lock);
598
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 seq_printf(seq, "system level: S%d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400600 "order: %d\n"
601 "reference count: %d\n",
602 resource->system_level,
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500603 resource->order, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Len Brown4be44fc2005-08-05 00:44:28 -0400605 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400606 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607}
608
609static int acpi_power_open_fs(struct inode *inode, struct file *file)
610{
611 return single_open(file, acpi_power_seq_show, PDE(inode)->data);
612}
613
Len Brown4be44fc2005-08-05 00:44:28 -0400614static int acpi_power_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615{
Len Brown4be44fc2005-08-05 00:44:28 -0400616 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400620 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
622 if (!acpi_device_dir(device)) {
623 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400624 acpi_power_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400626 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 }
628
629 /* 'status' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700630 entry = proc_create_data(ACPI_POWER_FILE_STATUS,
631 S_IRUGO, acpi_device_dir(device),
632 &acpi_power_fops, acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400634 return -EIO;
Patrick Mocheld550d982006-06-27 00:41:40 -0400635 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636}
637
Len Brown4be44fc2005-08-05 00:44:28 -0400638static int acpi_power_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
641 if (acpi_device_dir(device)) {
642 remove_proc_entry(ACPI_POWER_FILE_STATUS,
643 acpi_device_dir(device));
644 remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
645 acpi_device_dir(device) = NULL;
646 }
647
Patrick Mocheld550d982006-06-27 00:41:40 -0400648 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649}
650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651/* --------------------------------------------------------------------------
652 Driver Interface
653 -------------------------------------------------------------------------- */
654
Len Brown4be44fc2005-08-05 00:44:28 -0400655static int acpi_power_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400657 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400658 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400660 union acpi_object acpi_object;
661 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
664 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400665 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
Burman Yan36bcbec2006-12-19 12:56:11 -0800667 resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400669 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
Patrick Mochel41598572006-05-19 16:54:40 -0400671 resource->device = device;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500672 mutex_init(&resource->resource_lock);
673 INIT_LIST_HEAD(&resource->reference);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 strcpy(resource->name, device->pnp.bus_id);
675 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
676 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700677 device->driver_data = resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679 /* Evalute the object to get the system level and resource order. */
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400680 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 if (ACPI_FAILURE(status)) {
682 result = -ENODEV;
683 goto end;
684 }
685 resource->system_level = acpi_object.power_resource.system_level;
686 resource->order = acpi_object.power_resource.resource_order;
687
Zhao Yakuia51e1452008-08-11 14:55:05 +0800688 result = acpi_power_get_state(device->handle, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 if (result)
690 goto end;
691
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400692 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 case ACPI_POWER_RESOURCE_STATE_ON:
694 device->power.state = ACPI_STATE_D0;
695 break;
696 case ACPI_POWER_RESOURCE_STATE_OFF:
697 device->power.state = ACPI_STATE_D3;
698 break;
699 default:
700 device->power.state = ACPI_STATE_UNKNOWN;
701 break;
702 }
703
704 result = acpi_power_add_fs(device);
705 if (result)
706 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Len Brown4be44fc2005-08-05 00:44:28 -0400708 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400709 acpi_device_bid(device), state ? "on" : "off");
Len Brown4be44fc2005-08-05 00:44:28 -0400710
711 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 if (result)
713 kfree(resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400714
Patrick Mocheld550d982006-06-27 00:41:40 -0400715 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716}
717
Len Brown4be44fc2005-08-05 00:44:28 -0400718static int acpi_power_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719{
720 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500721 struct list_head *node, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400725 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200727 resource = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729 acpi_power_remove_fs(device);
730
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500731 mutex_lock(&resource->resource_lock);
732 list_for_each_safe(node, next, &resource->reference) {
733 struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node);
734 list_del(&ref->node);
735 kfree(ref);
736 }
737 mutex_unlock(&resource->resource_lock);
738
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 kfree(resource);
740
Patrick Mocheld550d982006-06-27 00:41:40 -0400741 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742}
743
Len Browne8363f32007-02-16 02:05:39 -0500744static int acpi_power_resume(struct acpi_device *device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500745{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400746 int result = 0, state;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500747 struct acpi_power_resource *resource = NULL;
748 struct acpi_power_reference *ref;
749
750 if (!device || !acpi_driver_data(device))
751 return -EINVAL;
752
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700753 resource = acpi_driver_data(device);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500754
Zhao Yakuia51e1452008-08-11 14:55:05 +0800755 result = acpi_power_get_state(device->handle, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500756 if (result)
757 return result;
758
759 mutex_lock(&resource->resource_lock);
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400760 if (state == ACPI_POWER_RESOURCE_STATE_OFF &&
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500761 !list_empty(&resource->reference)) {
762 ref = container_of(resource->reference.next, struct acpi_power_reference, node);
763 mutex_unlock(&resource->resource_lock);
764 result = acpi_power_on(device->handle, ref->device);
765 return result;
766 }
767
768 mutex_unlock(&resource->resource_lock);
769 return 0;
770}
771
Len Brown4be44fc2005-08-05 00:44:28 -0400772static int __init acpi_power_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773{
Len Brown4be44fc2005-08-05 00:44:28 -0400774 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
777 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400778 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
780 INIT_LIST_HEAD(&acpi_power_resource_list);
781
782 acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
783 if (!acpi_power_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400784 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785
786 result = acpi_bus_register_driver(&acpi_power_driver);
787 if (result < 0) {
788 remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -0400789 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 }
791
Patrick Mocheld550d982006-06-27 00:41:40 -0400792 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793}
794
795subsys_initcall(acpi_power_init);