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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 Brownc2b67052007-02-12 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 = {
Len Brown4be44fc2005-08-05 00:44:28 -040096 .open = acpi_power_open_fs,
97 .read = seq_read,
98 .llseek = seq_lseek,
99 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100};
101
102/* --------------------------------------------------------------------------
103 Power Resource Management
104 -------------------------------------------------------------------------- */
105
106static int
Len Brown4be44fc2005-08-05 00:44:28 -0400107acpi_power_get_context(acpi_handle handle,
108 struct acpi_power_resource **resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
Len Brown4be44fc2005-08-05 00:44:28 -0400110 int result = 0;
111 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400115 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 result = acpi_bus_get_device(handle, &device);
118 if (result) {
Len Browncece9292006-06-26 23:04:31 -0400119 printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
Patrick Mocheld550d982006-06-27 00:41:40 -0400120 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
122
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200123 *resource = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400125 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Patrick Mocheld550d982006-06-27 00:41:40 -0400127 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400130static int acpi_power_get_state(struct acpi_power_resource *resource, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
Len Brown4be44fc2005-08-05 00:44:28 -0400132 acpi_status status = AE_OK;
133 unsigned long sta = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400136 if (!resource || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400137 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400139 status = acpi_evaluate_integer(resource->device->handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400141 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400143 *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
144 ACPI_POWER_RESOURCE_STATE_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400147 resource->name, state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Patrick Mocheld550d982006-06-27 00:41:40 -0400149 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
Len Brown4be44fc2005-08-05 00:44:28 -0400152static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400154 int result = 0, state1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400156 u32 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 if (!list || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400160 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 /* The state of the list is 'on' IFF all resources are 'on'. */
163
Len Brown4be44fc2005-08-05 00:44:28 -0400164 for (i = 0; i < list->count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 result = acpi_power_get_context(list->handles[i], &resource);
166 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400167 return result;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400168 result = acpi_power_get_state(resource, &state1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400170 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400172 *state = state1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 if (*state != ACPI_POWER_RESOURCE_STATE_ON)
175 break;
176 }
177
178 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400179 *state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Patrick Mocheld550d982006-06-27 00:41:40 -0400181 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182}
183
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500184static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400186 int result = 0, state;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500187 int found = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400188 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500190 struct list_head *node, *next;
191 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 result = acpi_power_get_context(handle, &resource);
195 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400196 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500198 mutex_lock(&resource->resource_lock);
199 list_for_each_safe(node, next, &resource->reference) {
200 ref = container_of(node, struct acpi_power_reference, node);
201 if (dev->handle == ref->device->handle) {
202 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already referenced by resource [%s]\n",
203 dev->pnp.bus_id, resource->name));
204 found = 1;
205 break;
206 }
207 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500209 if (!found) {
210 ref = kmalloc(sizeof (struct acpi_power_reference),
211 irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL);
212 if (!ref) {
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "kmalloc() failed\n"));
214 mutex_unlock(&resource->resource_lock);
215 return -ENOMEM;
216 }
217 list_add_tail(&ref->node, &resource->reference);
218 ref->device = dev;
219 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] added to resource [%s] references\n",
220 dev->pnp.bus_id, resource->name));
221 }
222 mutex_unlock(&resource->resource_lock);
223
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400224 status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400226 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400228 result = acpi_power_get_state(resource, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400230 return result;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400231 if (state != ACPI_POWER_RESOURCE_STATE_ON)
Patrick Mocheld550d982006-06-27 00:41:40 -0400232 return -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 /* Update the power resource's _device_ power state */
Patrick Mochel41598572006-05-19 16:54:40 -0400235 resource->device->power.state = ACPI_STATE_D0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400238 resource->name));
Patrick Mocheld550d982006-06-27 00:41:40 -0400239 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500242static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400244 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400245 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500247 struct list_head *node, *next;
248 struct acpi_power_reference *ref;
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 result = acpi_power_get_context(handle, &resource);
252 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400253 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500255 mutex_lock(&resource->resource_lock);
256 list_for_each_safe(node, next, &resource->reference) {
257 ref = container_of(node, struct acpi_power_reference, node);
258 if (dev->handle == ref->device->handle) {
259 list_del(&ref->node);
260 kfree(ref);
261 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] removed from resource [%s] references\n",
262 dev->pnp.bus_id, resource->name));
263 break;
264 }
265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500267 if (!list_empty(&resource->reference)) {
268 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cannot turn resource [%s] off - resource is in use\n",
269 resource->name));
270 mutex_unlock(&resource->resource_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400271 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500273 mutex_unlock(&resource->resource_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400275 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400277 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400279 result = acpi_power_get_state(resource, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400281 return result;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400282 if (state != ACPI_POWER_RESOURCE_STATE_OFF)
Patrick Mocheld550d982006-06-27 00:41:40 -0400283 return -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 /* Update the power resource's _device_ power state */
Dmitry Torokhov786f18c2006-08-23 23:18:06 -0400286 resource->device->power.state = ACPI_STATE_D3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
288 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400289 resource->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Patrick Mocheld550d982006-06-27 00:41:40 -0400291 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292}
293
294/*
295 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
296 * 1. Power on the power resources required for the wakeup device
297 * 2. Enable _PSW (power state wake) for the device if present
298 */
Len Brown4be44fc2005-08-05 00:44:28 -0400299int acpi_enable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Len Brown4be44fc2005-08-05 00:44:28 -0400301 union acpi_object arg = { ACPI_TYPE_INTEGER };
302 struct acpi_object_list arg_list = { 1, &arg };
303 acpi_status status = AE_OK;
304 int i;
305 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 if (!dev || !dev->wakeup.flags.valid)
Patrick Mocheld550d982006-06-27 00:41:40 -0400308 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 arg.integer.value = 1;
311 /* Open power resource */
312 for (i = 0; i < dev->wakeup.resources.count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500313 ret = acpi_power_on(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400315 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400317 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 }
319 }
320
321 /* Execute PSW */
322 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
323 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Len Brown64684632006-06-26 23:41:38 -0400324 printk(KERN_ERR PREFIX "Evaluate _PSW\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 dev->wakeup.flags.valid = 0;
326 ret = -1;
327 }
328
Patrick Mocheld550d982006-06-27 00:41:40 -0400329 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331
332/*
333 * Shutdown a wakeup device, counterpart of above method
334 * 1. Disable _PSW (power state wake)
335 * 2. Shutdown down the power resources
336 */
Len Brown4be44fc2005-08-05 00:44:28 -0400337int acpi_disable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
Len Brown4be44fc2005-08-05 00:44:28 -0400339 union acpi_object arg = { ACPI_TYPE_INTEGER };
340 struct acpi_object_list arg_list = { 1, &arg };
341 acpi_status status = AE_OK;
342 int i;
343 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346 if (!dev || !dev->wakeup.flags.valid)
Patrick Mocheld550d982006-06-27 00:41:40 -0400347 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Len Brown4be44fc2005-08-05 00:44:28 -0400349 arg.integer.value = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 /* Execute PSW */
351 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
352 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Len Brown64684632006-06-26 23:41:38 -0400353 printk(KERN_ERR PREFIX "Evaluate _PSW\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400355 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 }
357
358 /* Close power resource */
359 for (i = 0; i < dev->wakeup.resources.count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500360 ret = acpi_power_off_device(dev->wakeup.resources.handles[i], dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400362 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400364 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 }
366 }
367
Patrick Mocheld550d982006-06-27 00:41:40 -0400368 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369}
370
371/* --------------------------------------------------------------------------
372 Device Power Management
373 -------------------------------------------------------------------------- */
374
Len Brown4be44fc2005-08-05 00:44:28 -0400375int acpi_power_get_inferred_state(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376{
Len Brown4be44fc2005-08-05 00:44:28 -0400377 int result = 0;
378 struct acpi_handle_list *list = NULL;
379 int list_state = 0;
380 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400384 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386 device->power.state = ACPI_STATE_UNKNOWN;
387
388 /*
389 * We know a device's inferred power state when all the resources
390 * required for a given D-state are 'on'.
391 */
Len Brown4be44fc2005-08-05 00:44:28 -0400392 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 list = &device->power.states[i].resources;
394 if (list->count < 1)
395 continue;
396
397 result = acpi_power_get_list_state(list, &list_state);
398 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400399 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
402 device->power.state = i;
Patrick Mocheld550d982006-06-27 00:41:40 -0400403 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 }
405 }
406
407 device->power.state = ACPI_STATE_D3;
408
Patrick Mocheld550d982006-06-27 00:41:40 -0400409 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
Len Brown4be44fc2005-08-05 00:44:28 -0400412int acpi_power_transition(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413{
Len Brown4be44fc2005-08-05 00:44:28 -0400414 int result = 0;
415 struct acpi_handle_list *cl = NULL; /* Current Resources */
416 struct acpi_handle_list *tl = NULL; /* Target Resources */
417 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400421 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Len Brown4be44fc2005-08-05 00:44:28 -0400423 if ((device->power.state < ACPI_STATE_D0)
424 || (device->power.state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400425 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
427 cl = &device->power.states[device->power.state].resources;
428 tl = &device->power.states[state].resources;
429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 if (!cl->count && !tl->count) {
431 result = -ENODEV;
432 goto end;
433 }
434
435 /* TBD: Resources must be ordered. */
436
437 /*
438 * First we reference all power resources required in the target list
439 * (e.g. so the device doesn't lose power while transitioning).
440 */
Len Brown4be44fc2005-08-05 00:44:28 -0400441 for (i = 0; i < tl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500442 result = acpi_power_on(tl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 if (result)
444 goto end;
445 }
446
Konstantin Karasyovb1028c52007-02-16 02:23:07 -0500447 if (device->power.state == state) {
448 goto end;
449 }
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 /*
452 * Then we dereference all power resources used in the current list.
453 */
Len Brown4be44fc2005-08-05 00:44:28 -0400454 for (i = 0; i < cl->count; i++) {
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500455 result = acpi_power_off_device(cl->handles[i], device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 if (result)
457 goto end;
458 }
459
Konstantin Karasyov72925762007-02-21 02:05:58 -0500460 end:
Miguel Botóne76d5f72008-02-04 23:31:19 -0800461 if (result)
Konstantin Karasyov72925762007-02-21 02:05:58 -0500462 device->power.state = ACPI_STATE_UNKNOWN;
Miguel Botóne76d5f72008-02-04 23:31:19 -0800463 else {
Konstantin Karasyov72925762007-02-21 02:05:58 -0500464 /* We shouldn't change the state till all above operations succeed */
465 device->power.state = state;
466 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Patrick Mocheld550d982006-06-27 00:41:40 -0400468 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471/* --------------------------------------------------------------------------
472 FS Interface (/proc)
473 -------------------------------------------------------------------------- */
474
Len Brown4be44fc2005-08-05 00:44:28 -0400475static struct proc_dir_entry *acpi_power_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477static int acpi_power_seq_show(struct seq_file *seq, void *offset)
478{
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500479 int count = 0;
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400480 int result = 0, state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500482 struct list_head *node, *next;
483 struct acpi_power_reference *ref;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200486 resource = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 if (!resource)
489 goto end;
490
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400491 result = acpi_power_get_state(resource, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500492 if (result)
493 goto end;
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 seq_puts(seq, "state: ");
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400496 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 case ACPI_POWER_RESOURCE_STATE_ON:
498 seq_puts(seq, "on\n");
499 break;
500 case ACPI_POWER_RESOURCE_STATE_OFF:
501 seq_puts(seq, "off\n");
502 break;
503 default:
504 seq_puts(seq, "unknown\n");
505 break;
506 }
507
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500508 mutex_lock(&resource->resource_lock);
509 list_for_each_safe(node, next, &resource->reference) {
510 ref = container_of(node, struct acpi_power_reference, node);
511 count++;
512 }
513 mutex_unlock(&resource->resource_lock);
514
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 seq_printf(seq, "system level: S%d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400516 "order: %d\n"
517 "reference count: %d\n",
518 resource->system_level,
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500519 resource->order, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Len Brown4be44fc2005-08-05 00:44:28 -0400521 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400522 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
525static int acpi_power_open_fs(struct inode *inode, struct file *file)
526{
527 return single_open(file, acpi_power_seq_show, PDE(inode)->data);
528}
529
Len Brown4be44fc2005-08-05 00:44:28 -0400530static int acpi_power_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531{
Len Brown4be44fc2005-08-05 00:44:28 -0400532 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400536 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
538 if (!acpi_device_dir(device)) {
539 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400540 acpi_power_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400542 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
544
545 /* 'status' [R] */
546 entry = create_proc_entry(ACPI_POWER_FILE_STATUS,
Len Brown4be44fc2005-08-05 00:44:28 -0400547 S_IRUGO, acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400549 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 else {
551 entry->proc_fops = &acpi_power_fops;
552 entry->data = acpi_driver_data(device);
553 }
554
Patrick Mocheld550d982006-06-27 00:41:40 -0400555 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556}
557
Len Brown4be44fc2005-08-05 00:44:28 -0400558static int acpi_power_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
561 if (acpi_device_dir(device)) {
562 remove_proc_entry(ACPI_POWER_FILE_STATUS,
563 acpi_device_dir(device));
564 remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
565 acpi_device_dir(device) = NULL;
566 }
567
Patrick Mocheld550d982006-06-27 00:41:40 -0400568 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569}
570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571/* --------------------------------------------------------------------------
572 Driver Interface
573 -------------------------------------------------------------------------- */
574
Len Brown4be44fc2005-08-05 00:44:28 -0400575static int acpi_power_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400577 int result = 0, state;
Len Brown4be44fc2005-08-05 00:44:28 -0400578 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400580 union acpi_object acpi_object;
581 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400585 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
Burman Yan36bcbec2006-12-19 12:56:11 -0800587 resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400589 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
Patrick Mochel41598572006-05-19 16:54:40 -0400591 resource->device = device;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500592 mutex_init(&resource->resource_lock);
593 INIT_LIST_HEAD(&resource->reference);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 strcpy(resource->name, device->pnp.bus_id);
595 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
596 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
597 acpi_driver_data(device) = resource;
598
599 /* Evalute the object to get the system level and resource order. */
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400600 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 if (ACPI_FAILURE(status)) {
602 result = -ENODEV;
603 goto end;
604 }
605 resource->system_level = acpi_object.power_resource.system_level;
606 resource->order = acpi_object.power_resource.resource_order;
607
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400608 result = acpi_power_get_state(resource, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (result)
610 goto end;
611
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400612 switch (state) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 case ACPI_POWER_RESOURCE_STATE_ON:
614 device->power.state = ACPI_STATE_D0;
615 break;
616 case ACPI_POWER_RESOURCE_STATE_OFF:
617 device->power.state = ACPI_STATE_D3;
618 break;
619 default:
620 device->power.state = ACPI_STATE_UNKNOWN;
621 break;
622 }
623
624 result = acpi_power_add_fs(device);
625 if (result)
626 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Len Brown4be44fc2005-08-05 00:44:28 -0400628 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400629 acpi_device_bid(device), state ? "on" : "off");
Len Brown4be44fc2005-08-05 00:44:28 -0400630
631 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 if (result)
633 kfree(resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400634
Patrick Mocheld550d982006-06-27 00:41:40 -0400635 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636}
637
Len Brown4be44fc2005-08-05 00:44:28 -0400638static int acpi_power_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639{
640 struct acpi_power_resource *resource = NULL;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500641 struct list_head *node, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
644 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400645 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200647 resource = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649 acpi_power_remove_fs(device);
650
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500651 mutex_lock(&resource->resource_lock);
652 list_for_each_safe(node, next, &resource->reference) {
653 struct acpi_power_reference *ref = container_of(node, struct acpi_power_reference, node);
654 list_del(&ref->node);
655 kfree(ref);
656 }
657 mutex_unlock(&resource->resource_lock);
658
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 kfree(resource);
660
Patrick Mocheld550d982006-06-27 00:41:40 -0400661 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
663
Len Browne8363f32007-02-16 02:05:39 -0500664static int acpi_power_resume(struct acpi_device *device)
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500665{
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400666 int result = 0, state;
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500667 struct acpi_power_resource *resource = NULL;
668 struct acpi_power_reference *ref;
669
670 if (!device || !acpi_driver_data(device))
671 return -EINVAL;
672
673 resource = (struct acpi_power_resource *)acpi_driver_data(device);
674
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400675 result = acpi_power_get_state(resource, &state);
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500676 if (result)
677 return result;
678
679 mutex_lock(&resource->resource_lock);
Alexey Starikovskiyc35923b2007-10-22 14:19:09 +0400680 if (state == ACPI_POWER_RESOURCE_STATE_OFF &&
Konstantin Karasyov0a613902007-02-16 01:47:06 -0500681 !list_empty(&resource->reference)) {
682 ref = container_of(resource->reference.next, struct acpi_power_reference, node);
683 mutex_unlock(&resource->resource_lock);
684 result = acpi_power_on(device->handle, ref->device);
685 return result;
686 }
687
688 mutex_unlock(&resource->resource_lock);
689 return 0;
690}
691
Len Brown4be44fc2005-08-05 00:44:28 -0400692static int __init acpi_power_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Len Brown4be44fc2005-08-05 00:44:28 -0400694 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400698 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 INIT_LIST_HEAD(&acpi_power_resource_list);
701
702 acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
703 if (!acpi_power_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400704 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
706 result = acpi_bus_register_driver(&acpi_power_driver);
707 if (result < 0) {
708 remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -0400709 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 }
711
Patrick Mocheld550d982006-06-27 00:41:40 -0400712 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713}
714
715subsys_initcall(acpi_power_init);