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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
Linus Torvalds1da177e2005-04-16 15:20:36 -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_COMPONENT 0x00800000
50#define ACPI_POWER_CLASS "power_resource"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define ACPI_POWER_DEVICE_NAME "Power Resource"
52#define ACPI_POWER_FILE_INFO "info"
53#define ACPI_POWER_FILE_STATUS "state"
54#define ACPI_POWER_RESOURCE_STATE_OFF 0x00
55#define ACPI_POWER_RESOURCE_STATE_ON 0x01
56#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
Len Brown4be44fc2005-08-05 00:44:28 -040057static int acpi_power_add(struct acpi_device *device);
58static int acpi_power_remove(struct acpi_device *device, int type);
Len Browne8363f32007-02-16 02:05:39 -050059static int acpi_power_resume(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060static int acpi_power_open_fs(struct inode *inode, struct file *file);
61
Thomas Renninger1ba90e32007-07-23 14:44:41 +020062static struct acpi_device_id power_device_ids[] = {
63 {ACPI_POWER_HID, 0},
64 {"", 0},
65};
66MODULE_DEVICE_TABLE(acpi, power_device_ids);
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068static struct acpi_driver acpi_power_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050069 .name = "power",
Len Brown4be44fc2005-08-05 00:44:28 -040070 .class = ACPI_POWER_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020071 .ids = power_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040072 .ops = {
73 .add = acpi_power_add,
74 .remove = acpi_power_remove,
Konstantin Karasyov0a613902007-02-16 01:47:06 -050075 .resume = acpi_power_resume,
Len Brown4be44fc2005-08-05 00:44:28 -040076 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070077};
78
Konstantin Karasyov0a613902007-02-16 01:47:06 -050079struct acpi_power_reference {
80 struct list_head node;
81 struct acpi_device *device;
82};
83
Len Brown4be44fc2005-08-05 00:44:28 -040084struct acpi_power_resource {
Patrick Mochel41598572006-05-19 16:54:40 -040085 struct acpi_device * device;
Len Brown4be44fc2005-08-05 00:44:28 -040086 acpi_bus_id name;
87 u32 system_level;
88 u32 order;
Konstantin Karasyov0a613902007-02-16 01:47:06 -050089 struct mutex resource_lock;
90 struct list_head reference;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091};
92
Len Brown4be44fc2005-08-05 00:44:28 -040093static struct list_head acpi_power_resource_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Arjan van de Vend7508032006-07-04 13:06:00 -040095static const struct file_operations acpi_power_fops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -070096 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -040097 .open = acpi_power_open_fs,
98 .read = seq_read,
99 .llseek = seq_lseek,
100 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101};
102
103/* --------------------------------------------------------------------------
104 Power Resource Management
105 -------------------------------------------------------------------------- */
106
107static int
Len Brown4be44fc2005-08-05 00:44:28 -0400108acpi_power_get_context(acpi_handle handle,
109 struct acpi_power_resource **resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
Len Brown4be44fc2005-08-05 00:44:28 -0400111 int result = 0;
112 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400116 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118 result = acpi_bus_get_device(handle, &device);
119 if (result) {
Len Browncece9292006-06-26 23:04:31 -0400120 printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
Patrick Mocheld550d982006-06-27 00:41:40 -0400121 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 }
123
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200124 *resource = acpi_driver_data(device);
Li Zefana815ab82008-04-18 13:27:29 -0700125 if (!*resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400126 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Patrick Mocheld550d982006-06-27 00:41:40 -0400128 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400131static int acpi_power_get_state(struct acpi_power_resource *resource, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Len Brown4be44fc2005-08-05 00:44:28 -0400133 acpi_status status = AE_OK;
134 unsigned long sta = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400137 if (!resource || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400138 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400140 status = acpi_evaluate_integer(resource->device->handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400142 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400144 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
145 ACPI_POWER_RESOURCE_STATE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400148 resource->name, state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Patrick Mocheld550d982006-06-27 00:41:40 -0400150 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
152
Len Brown4be44fc2005-08-05 00:44:28 -0400153static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400155 int result = 0, state1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400157 u32 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 if (!list || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400161 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 /* The state of the list is 'on' IFF all resources are 'on'. */
164
Len Brown4be44fc2005-08-05 00:44:28 -0400165 for (i = 0; i < list->count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 result = acpi_power_get_context(list->handles[i], &resource);
167 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400168 return result;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400169 result = acpi_power_get_state(resource, &state1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400171 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400173 *state = state1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 if (*state != ACPI_POWER_RESOURCE_STATE_ON)
176 break;
177 }
178
179 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400180 *state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Patrick Mocheld550d982006-06-27 00:41:40 -0400182 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500185static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400187 int result = 0, state;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500188 int found = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400189 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500191 struct list_head *node, *next;
192 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 result = acpi_power_get_context(handle, &resource);
196 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400197 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500199 mutex_lock(&resource->resource_lock);
200 list_for_each_safe(node, next, &resource->reference) {
201 ref = container_of(node, struct acpi_power_reference, node);
202 if (dev->handle == ref->device->handle) {
203 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n",
204 dev->pnp.bus_id, resource->name));
205 found = 1;
206 break;
207 }
208 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500210 if (!found) {
211 ref = kmalloc(sizeof (struct acpi_power_reference),
212 irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL);
213 if (!ref) {
214 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n"));
215 mutex_unlock(&resource->resource_lock);
216 return -ENOMEM;
217 }
218 list_add_tail(&ref->node, &resource->reference);
219 ref->device = dev;
220 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n",
221 dev->pnp.bus_id, resource->name));
222 }
223 mutex_unlock(&resource->resource_lock);
224
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400225 status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400227 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400229 result = acpi_power_get_state(resource, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400231 return result;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400232 if (state != ACPI_POWER_RESOURCE_STATE_ON)
Patrick Mocheld550d982006-06-27 00:41:40 -0400233 return -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 /* Update the power resource's _device_ power state */
Patrick Mochel41598572006-05-19 16:54:40 -0400236 resource->device->power.state = ACPI_STATE_D0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400239 resource->name));
Patrick Mocheld550d982006-06-27 00:41:40 -0400240 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241}
242
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500243static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400245 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400246 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500248 struct list_head *node, *next;
249 struct acpi_power_reference *ref;
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 result = acpi_power_get_context(handle, &resource);
253 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400254 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500256 mutex_lock(&resource->resource_lock);
257 list_for_each_safe(node, next, &resource->reference) {
258 ref = container_of(node, struct acpi_power_reference, node);
259 if (dev->handle == ref->device->handle) {
260 list_del(&ref->node);
261 kfree(ref);
262 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n",
263 dev->pnp.bus_id, resource->name));
264 break;
265 }
266 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500268 if (!list_empty(&resource->reference)) {
269 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n",
270 resource->name));
271 mutex_unlock(&resource->resource_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400272 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500274 mutex_unlock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400276 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400278 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400280 result = acpi_power_get_state(resource, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400282 return result;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400283 if (state != ACPI_POWER_RESOURCE_STATE_OFF)
Patrick Mocheld550d982006-06-27 00:41:40 -0400284 return -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 /* Update the power resource's _device_ power state */
Dmitry Torokhov786f18c2006-08-23 23:18:06 -0400287 resource->device->power.state = ACPI_STATE_D3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400290 resource->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Patrick Mocheld550d982006-06-27 00:41:40 -0400292 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
295/*
296 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
297 * 1. Power on the power resources required for the wakeup device
298 * 2. Enable _PSW (power state wake) for the device if present
299 */
Len Brown4be44fc2005-08-05 00:44:28 -0400300int acpi_enable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
Len Brown4be44fc2005-08-05 00:44:28 -0400302 union acpi_object arg = { ACPI_TYPE_INTEGER };
303 struct acpi_object_list arg_list = { 1, &arg };
304 acpi_status status = AE_OK;
305 int i;
306 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (!dev || !dev->wakeup.flags.valid)
Patrick Mocheld550d982006-06-27 00:41:40 -0400309 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
311 arg.integer.value = 1;
312 /* Open power resource */
313 for (i = 0; i < dev->wakeup.resources.count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500314 ret = acpi_power_on(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400316 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400318 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 }
320 }
321
322 /* Execute PSW */
323 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
324 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Len Brown64684632006-06-26 23:41:38 -0400325 printk(KERN_ERR PREFIX "Evaluate _PSW\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 dev->wakeup.flags.valid = 0;
327 ret = -1;
328 }
329
Patrick Mocheld550d982006-06-27 00:41:40 -0400330 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331}
332
333/*
334 * Shutdown a wakeup device, counterpart of above method
335 * 1. Disable _PSW (power state wake)
336 * 2. Shutdown down the power resources
337 */
Len Brown4be44fc2005-08-05 00:44:28 -0400338int acpi_disable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339{
Len Brown4be44fc2005-08-05 00:44:28 -0400340 union acpi_object arg = { ACPI_TYPE_INTEGER };
341 struct acpi_object_list arg_list = { 1, &arg };
342 acpi_status status = AE_OK;
343 int i;
344 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347 if (!dev || !dev->wakeup.flags.valid)
Patrick Mocheld550d982006-06-27 00:41:40 -0400348 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Len Brown4be44fc2005-08-05 00:44:28 -0400350 arg.integer.value = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 /* Execute PSW */
352 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
353 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Len Brown64684632006-06-26 23:41:38 -0400354 printk(KERN_ERR PREFIX "Evaluate _PSW\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400356 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
358
359 /* Close power resource */
360 for (i = 0; i < dev->wakeup.resources.count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500361 ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400363 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400365 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 }
367 }
368
Patrick Mocheld550d982006-06-27 00:41:40 -0400369 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
372/* --------------------------------------------------------------------------
373 Device Power Management
374 -------------------------------------------------------------------------- */
375
Len Brown4be44fc2005-08-05 00:44:28 -0400376int acpi_power_get_inferred_state(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
Len Brown4be44fc2005-08-05 00:44:28 -0400378 int result = 0;
379 struct acpi_handle_list *list = NULL;
380 int list_state = 0;
381 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400385 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387 device->power.state = ACPI_STATE_UNKNOWN;
388
389 /*
390 * We know a device's inferred power state when all the resources
391 * required for a given D-state are 'on'.
392 */
Len Brown4be44fc2005-08-05 00:44:28 -0400393 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 list = &device->power.states[i].resources;
395 if (list->count < 1)
396 continue;
397
398 result = acpi_power_get_list_state(list, &list_state);
399 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400400 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
403 device->power.state = i;
Patrick Mocheld550d982006-06-27 00:41:40 -0400404 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
406 }
407
408 device->power.state = ACPI_STATE_D3;
409
Patrick Mocheld550d982006-06-27 00:41:40 -0400410 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411}
412
Len Brown4be44fc2005-08-05 00:44:28 -0400413int acpi_power_transition(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
Len Brown4be44fc2005-08-05 00:44:28 -0400415 int result = 0;
416 struct acpi_handle_list *cl = NULL; /* Current Resources */
417 struct acpi_handle_list *tl = NULL; /* Target Resources */
418 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400422 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Len Brown4be44fc2005-08-05 00:44:28 -0400424 if ((device->power.state < ACPI_STATE_D0)
425 || (device->power.state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400426 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 cl = &device->power.states[device->power.state].resources;
429 tl = &device->power.states[state].resources;
430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (!cl->count && !tl->count) {
432 result = -ENODEV;
433 goto end;
434 }
435
436 /* TBD: Resources must be ordered. */
437
438 /*
439 * First we reference all power resources required in the target list
440 * (e.g. so the device doesn't lose power while transitioning).
441 */
Len Brown4be44fc2005-08-05 00:44:28 -0400442 for (i = 0; i < tl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500443 result = acpi_power_on(tl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (result)
445 goto end;
446 }
447
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500448 if (device->power.state == state) {
449 goto end;
450 }
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 /*
453 * Then we dereference all power resources used in the current list.
454 */
Len Brown4be44fc2005-08-05 00:44:28 -0400455 for (i = 0; i < cl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500456 result = acpi_power_off_device(cl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 if (result)
458 goto end;
459 }
460
Konstantin Karasyov72925762007-02-21 02:05:58 -0500461 end:
Miguel Botóne76d5f72008-02-04 23:31:19 -0800462 if (result)
Konstantin Karasyov72925762007-02-21 02:05:58 -0500463 device->power.state = ACPI_STATE_UNKNOWN;
Miguel Botóne76d5f72008-02-04 23:31:19 -0800464 else {
Konstantin Karasyov72925762007-02-21 02:05:58 -0500465 /* We shouldn't change the state till all above operations succeed */
466 device->power.state = state;
467 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Patrick Mocheld550d982006-06-27 00:41:40 -0400469 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470}
471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472/* --------------------------------------------------------------------------
473 FS Interface (/proc)
474 -------------------------------------------------------------------------- */
475
Len Brown4be44fc2005-08-05 00:44:28 -0400476static struct proc_dir_entry *acpi_power_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478static int acpi_power_seq_show(struct seq_file *seq, void *offset)
479{
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500480 int count = 0;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400481 int result = 0, state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500483 struct list_head *node, *next;
484 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200487 resource = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 if (!resource)
490 goto end;
491
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400492 result = acpi_power_get_state(resource, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500493 if (result)
494 goto end;
495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 seq_puts(seq, "state: ");
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400497 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 case ACPI_POWER_RESOURCE_STATE_ON:
499 seq_puts(seq, "on\n");
500 break;
501 case ACPI_POWER_RESOURCE_STATE_OFF:
502 seq_puts(seq, "off\n");
503 break;
504 default:
505 seq_puts(seq, "unknown\n");
506 break;
507 }
508
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500509 mutex_lock(&resource->resource_lock);
510 list_for_each_safe(node, next, &resource->reference) {
511 ref = container_of(node, struct acpi_power_reference, node);
512 count++;
513 }
514 mutex_unlock(&resource->resource_lock);
515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 seq_printf(seq, "system level: S%d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400517 "order: %d\n"
518 "reference count: %d\n",
519 resource->system_level,
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500520 resource->order, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Len Brown4be44fc2005-08-05 00:44:28 -0400522 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400523 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524}
525
526static int acpi_power_open_fs(struct inode *inode, struct file *file)
527{
528 return single_open(file, acpi_power_seq_show, PDE(inode)->data);
529}
530
Len Brown4be44fc2005-08-05 00:44:28 -0400531static int acpi_power_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
Len Brown4be44fc2005-08-05 00:44:28 -0400533 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400537 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 if (!acpi_device_dir(device)) {
540 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400541 acpi_power_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400543 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 }
545
546 /* 'status' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700547 entry = proc_create_data(ACPI_POWER_FILE_STATUS,
548 S_IRUGO, acpi_device_dir(device),
549 &acpi_power_fops, acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400551 return -EIO;
Patrick Mocheld550d982006-06-27 00:41:40 -0400552 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
Len Brown4be44fc2005-08-05 00:44:28 -0400555static int acpi_power_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 if (acpi_device_dir(device)) {
559 remove_proc_entry(ACPI_POWER_FILE_STATUS,
560 acpi_device_dir(device));
561 remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
562 acpi_device_dir(device) = NULL;
563 }
564
Patrick Mocheld550d982006-06-27 00:41:40 -0400565 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566}
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568/* --------------------------------------------------------------------------
569 Driver Interface
570 -------------------------------------------------------------------------- */
571
Len Brown4be44fc2005-08-05 00:44:28 -0400572static int acpi_power_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400574 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400575 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400577 union acpi_object acpi_object;
578 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400582 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Burman Yan36bcbec2006-12-19 12:56:11 -0800584 resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400586 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Patrick Mochel41598572006-05-19 16:54:40 -0400588 resource->device = device;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500589 mutex_init(&resource->resource_lock);
590 INIT_LIST_HEAD(&resource->reference);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 strcpy(resource->name, device->pnp.bus_id);
592 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
593 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
594 acpi_driver_data(device) = resource;
595
596 /* Evalute the object to get the system level and resource order. */
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400597 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 if (ACPI_FAILURE(status)) {
599 result = -ENODEV;
600 goto end;
601 }
602 resource->system_level = acpi_object.power_resource.system_level;
603 resource->order = acpi_object.power_resource.resource_order;
604
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400605 result = acpi_power_get_state(resource, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if (result)
607 goto end;
608
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400609 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 case ACPI_POWER_RESOURCE_STATE_ON:
611 device->power.state = ACPI_STATE_D0;
612 break;
613 case ACPI_POWER_RESOURCE_STATE_OFF:
614 device->power.state = ACPI_STATE_D3;
615 break;
616 default:
617 device->power.state = ACPI_STATE_UNKNOWN;
618 break;
619 }
620
621 result = acpi_power_add_fs(device);
622 if (result)
623 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Len Brown4be44fc2005-08-05 00:44:28 -0400625 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400626 acpi_device_bid(device), state ? "on" : "off");
Len Brown4be44fc2005-08-05 00:44:28 -0400627
628 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 if (result)
630 kfree(resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400631
Patrick Mocheld550d982006-06-27 00:41:40 -0400632 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633}
634
Len Brown4be44fc2005-08-05 00:44:28 -0400635static int acpi_power_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
637 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500638 struct list_head *node, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
641 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400642 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200644 resource = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
646 acpi_power_remove_fs(device);
647
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500648 mutex_lock(&resource->resource_lock);
649 list_for_each_safe(node, next, &resource->reference) {
650 struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node);
651 list_del(&ref->node);
652 kfree(ref);
653 }
654 mutex_unlock(&resource->resource_lock);
655
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 kfree(resource);
657
Patrick Mocheld550d982006-06-27 00:41:40 -0400658 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659}
660
Len Browne8363f32007-02-16 02:05:39 -0500661static int acpi_power_resume(struct acpi_device *device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500662{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400663 int result = 0, state;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500664 struct acpi_power_resource *resource = NULL;
665 struct acpi_power_reference *ref;
666
667 if (!device || !acpi_driver_data(device))
668 return -EINVAL;
669
670 resource = (struct acpi_power_resource *)acpi_driver_data(device);
671
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400672 result = acpi_power_get_state(resource, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500673 if (result)
674 return result;
675
676 mutex_lock(&resource->resource_lock);
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400677 if (state == ACPI_POWER_RESOURCE_STATE_OFF &&
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500678 !list_empty(&resource->reference)) {
679 ref = container_of(resource->reference.next, struct acpi_power_reference, node);
680 mutex_unlock(&resource->resource_lock);
681 result = acpi_power_on(device->handle, ref->device);
682 return result;
683 }
684
685 mutex_unlock(&resource->resource_lock);
686 return 0;
687}
688
Len Brown4be44fc2005-08-05 00:44:28 -0400689static int __init acpi_power_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690{
Len Brown4be44fc2005-08-05 00:44:28 -0400691 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
694 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400695 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 INIT_LIST_HEAD(&acpi_power_resource_list);
698
699 acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
700 if (!acpi_power_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400701 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 result = acpi_bus_register_driver(&acpi_power_driver);
704 if (result < 0) {
705 remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -0400706 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 }
708
Patrick Mocheld550d982006-06-27 00:41:40 -0400709 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
711
712subsys_initcall(acpi_power_init);