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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 Brown4be44fc2005-08-05 00:44:28 -040048ACPI_MODULE_NAME("acpi_power")
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#define ACPI_POWER_COMPONENT 0x00800000
50#define ACPI_POWER_CLASS "power_resource"
51#define ACPI_POWER_DRIVER_NAME "ACPI Power Resource Driver"
52#define ACPI_POWER_DEVICE_NAME "Power Resource"
53#define ACPI_POWER_FILE_INFO "info"
54#define ACPI_POWER_FILE_STATUS "state"
55#define ACPI_POWER_RESOURCE_STATE_OFF 0x00
56#define ACPI_POWER_RESOURCE_STATE_ON 0x01
57#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
Len Brown4be44fc2005-08-05 00:44:28 -040058static int acpi_power_add(struct acpi_device *device);
59static int acpi_power_remove(struct acpi_device *device, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060static int acpi_power_open_fs(struct inode *inode, struct file *file);
61
62static struct acpi_driver acpi_power_driver = {
Len Brown4be44fc2005-08-05 00:44:28 -040063 .name = ACPI_POWER_DRIVER_NAME,
64 .class = ACPI_POWER_CLASS,
65 .ids = ACPI_POWER_HID,
66 .ops = {
67 .add = acpi_power_add,
68 .remove = acpi_power_remove,
69 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070070};
71
Len Brown4be44fc2005-08-05 00:44:28 -040072struct acpi_power_resource {
Patrick Mochel41598572006-05-19 16:54:40 -040073 struct acpi_device * device;
Len Brown4be44fc2005-08-05 00:44:28 -040074 acpi_bus_id name;
75 u32 system_level;
76 u32 order;
77 int state;
78 int references;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079};
80
Len Brown4be44fc2005-08-05 00:44:28 -040081static struct list_head acpi_power_resource_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Arjan van de Vend7508032006-07-04 13:06:00 -040083static const struct file_operations acpi_power_fops = {
Len Brown4be44fc2005-08-05 00:44:28 -040084 .open = acpi_power_open_fs,
85 .read = seq_read,
86 .llseek = seq_lseek,
87 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -070088};
89
90/* --------------------------------------------------------------------------
91 Power Resource Management
92 -------------------------------------------------------------------------- */
93
94static int
Len Brown4be44fc2005-08-05 00:44:28 -040095acpi_power_get_context(acpi_handle handle,
96 struct acpi_power_resource **resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
Len Brown4be44fc2005-08-05 00:44:28 -040098 int result = 0;
99 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400103 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105 result = acpi_bus_get_device(handle, &device);
106 if (result) {
Len Browncece9292006-06-26 23:04:31 -0400107 printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
Patrick Mocheld550d982006-06-27 00:41:40 -0400108 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 }
110
Len Brown4be44fc2005-08-05 00:44:28 -0400111 *resource = (struct acpi_power_resource *)acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400113 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Patrick Mocheld550d982006-06-27 00:41:40 -0400115 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
Len Brown4be44fc2005-08-05 00:44:28 -0400118static int acpi_power_get_state(struct acpi_power_resource *resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
Len Brown4be44fc2005-08-05 00:44:28 -0400120 acpi_status status = AE_OK;
121 unsigned long sta = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400125 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400127 status = acpi_evaluate_integer(resource->device->handle, "_STA", NULL, &sta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400129 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 if (sta & 0x01)
132 resource->state = ACPI_POWER_RESOURCE_STATE_ON;
133 else
134 resource->state = ACPI_POWER_RESOURCE_STATE_OFF;
135
136 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400137 resource->name, resource->state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Patrick Mocheld550d982006-06-27 00:41:40 -0400139 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Len Brown4be44fc2005-08-05 00:44:28 -0400142static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
Len Brown4be44fc2005-08-05 00:44:28 -0400144 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400146 u32 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 if (!list || !state)
Patrick Mocheld550d982006-06-27 00:41:40 -0400150 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 /* The state of the list is 'on' IFF all resources are 'on'. */
153
Len Brown4be44fc2005-08-05 00:44:28 -0400154 for (i = 0; i < list->count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 result = acpi_power_get_context(list->handles[i], &resource);
156 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400157 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 result = acpi_power_get_state(resource);
159 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400160 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 *state = resource->state;
163
164 if (*state != ACPI_POWER_RESOURCE_STATE_ON)
165 break;
166 }
167
168 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400169 *state ? "on" : "off"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Patrick Mocheld550d982006-06-27 00:41:40 -0400171 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
Len Brown4be44fc2005-08-05 00:44:28 -0400174static int acpi_power_on(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Len Brown4be44fc2005-08-05 00:44:28 -0400176 int result = 0;
177 acpi_status status = AE_OK;
178 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 struct acpi_power_resource *resource = NULL;
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
182 result = acpi_power_get_context(handle, &resource);
183 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400184 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
186 resource->references++;
187
Len Brown4be44fc2005-08-05 00:44:28 -0400188 if ((resource->references > 1)
189 || (resource->state == ACPI_POWER_RESOURCE_STATE_ON)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400191 resource->name));
Patrick Mocheld550d982006-06-27 00:41:40 -0400192 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 }
194
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400195 status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400197 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 result = acpi_power_get_state(resource);
200 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400201 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 if (resource->state != ACPI_POWER_RESOURCE_STATE_ON)
Patrick Mocheld550d982006-06-27 00:41:40 -0400203 return -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 /* Update the power resource's _device_ power state */
Patrick Mochel41598572006-05-19 16:54:40 -0400206 device = resource->device;
207 resource->device->power.state = ACPI_STATE_D0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned on\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400210 resource->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Patrick Mocheld550d982006-06-27 00:41:40 -0400212 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213}
214
Len Brown4be44fc2005-08-05 00:44:28 -0400215static int acpi_power_off_device(acpi_handle handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
Len Brown4be44fc2005-08-05 00:44:28 -0400217 int result = 0;
218 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 struct acpi_power_resource *resource = NULL;
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 result = acpi_power_get_context(handle, &resource);
222 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400223 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 if (resource->references)
226 resource->references--;
227
228 if (resource->references) {
Len Brown4be44fc2005-08-05 00:44:28 -0400229 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
230 "Resource [%s] is still in use, dereferencing\n",
Dmitry Torokhov786f18c2006-08-23 23:18:06 -0400231 resource->device->pnp.bus_id));
Patrick Mocheld550d982006-06-27 00:41:40 -0400232 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 }
234
235 if (resource->state == ACPI_POWER_RESOURCE_STATE_OFF) {
236 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] already off\n",
Dmitry Torokhov786f18c2006-08-23 23:18:06 -0400237 resource->device->pnp.bus_id));
Patrick Mocheld550d982006-06-27 00:41:40 -0400238 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 }
240
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400241 status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400243 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245 result = acpi_power_get_state(resource);
246 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400247 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 if (resource->state != ACPI_POWER_RESOURCE_STATE_OFF)
Patrick Mocheld550d982006-06-27 00:41:40 -0400249 return -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 /* Update the power resource's _device_ power state */
Dmitry Torokhov786f18c2006-08-23 23:18:06 -0400252 resource->device->power.state = ACPI_STATE_D3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] turned off\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400255 resource->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Patrick Mocheld550d982006-06-27 00:41:40 -0400257 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258}
259
260/*
261 * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
262 * 1. Power on the power resources required for the wakeup device
263 * 2. Enable _PSW (power state wake) for the device if present
264 */
Len Brown4be44fc2005-08-05 00:44:28 -0400265int acpi_enable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
Len Brown4be44fc2005-08-05 00:44:28 -0400267 union acpi_object arg = { ACPI_TYPE_INTEGER };
268 struct acpi_object_list arg_list = { 1, &arg };
269 acpi_status status = AE_OK;
270 int i;
271 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 if (!dev || !dev->wakeup.flags.valid)
Patrick Mocheld550d982006-06-27 00:41:40 -0400274 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
276 arg.integer.value = 1;
277 /* Open power resource */
278 for (i = 0; i < dev->wakeup.resources.count; i++) {
279 ret = acpi_power_on(dev->wakeup.resources.handles[i]);
280 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400281 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400283 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 }
285 }
286
287 /* Execute PSW */
288 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
289 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Len Brown64684632006-06-26 23:41:38 -0400290 printk(KERN_ERR PREFIX "Evaluate _PSW\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 dev->wakeup.flags.valid = 0;
292 ret = -1;
293 }
294
Patrick Mocheld550d982006-06-27 00:41:40 -0400295 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
298/*
299 * Shutdown a wakeup device, counterpart of above method
300 * 1. Disable _PSW (power state wake)
301 * 2. Shutdown down the power resources
302 */
Len Brown4be44fc2005-08-05 00:44:28 -0400303int acpi_disable_wakeup_device_power(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
Len Brown4be44fc2005-08-05 00:44:28 -0400305 union acpi_object arg = { ACPI_TYPE_INTEGER };
306 struct acpi_object_list arg_list = { 1, &arg };
307 acpi_status status = AE_OK;
308 int i;
309 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312 if (!dev || !dev->wakeup.flags.valid)
Patrick Mocheld550d982006-06-27 00:41:40 -0400313 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Len Brown4be44fc2005-08-05 00:44:28 -0400315 arg.integer.value = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 /* Execute PSW */
317 status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
318 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
Len Brown64684632006-06-26 23:41:38 -0400319 printk(KERN_ERR PREFIX "Evaluate _PSW\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400321 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
323
324 /* Close power resource */
325 for (i = 0; i < dev->wakeup.resources.count; i++) {
326 ret = acpi_power_off_device(dev->wakeup.resources.handles[i]);
327 if (ret) {
Len Brown64684632006-06-26 23:41:38 -0400328 printk(KERN_ERR PREFIX "Transition power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 dev->wakeup.flags.valid = 0;
Patrick Mocheld550d982006-06-27 00:41:40 -0400330 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 }
332 }
333
Patrick Mocheld550d982006-06-27 00:41:40 -0400334 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335}
336
337/* --------------------------------------------------------------------------
338 Device Power Management
339 -------------------------------------------------------------------------- */
340
Len Brown4be44fc2005-08-05 00:44:28 -0400341int acpi_power_get_inferred_state(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342{
Len Brown4be44fc2005-08-05 00:44:28 -0400343 int result = 0;
344 struct acpi_handle_list *list = NULL;
345 int list_state = 0;
346 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400350 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352 device->power.state = ACPI_STATE_UNKNOWN;
353
354 /*
355 * We know a device's inferred power state when all the resources
356 * required for a given D-state are 'on'.
357 */
Len Brown4be44fc2005-08-05 00:44:28 -0400358 for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 list = &device->power.states[i].resources;
360 if (list->count < 1)
361 continue;
362
363 result = acpi_power_get_list_state(list, &list_state);
364 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400365 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
368 device->power.state = i;
Patrick Mocheld550d982006-06-27 00:41:40 -0400369 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
371 }
372
373 device->power.state = ACPI_STATE_D3;
374
Patrick Mocheld550d982006-06-27 00:41:40 -0400375 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}
377
Len Brown4be44fc2005-08-05 00:44:28 -0400378int acpi_power_transition(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379{
Len Brown4be44fc2005-08-05 00:44:28 -0400380 int result = 0;
381 struct acpi_handle_list *cl = NULL; /* Current Resources */
382 struct acpi_handle_list *tl = NULL; /* Target Resources */
383 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400387 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Len Brown4be44fc2005-08-05 00:44:28 -0400389 if ((device->power.state < ACPI_STATE_D0)
390 || (device->power.state > ACPI_STATE_D3))
Patrick Mocheld550d982006-06-27 00:41:40 -0400391 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 cl = &device->power.states[device->power.state].resources;
394 tl = &device->power.states[state].resources;
395
396 device->power.state = ACPI_STATE_UNKNOWN;
397
398 if (!cl->count && !tl->count) {
399 result = -ENODEV;
400 goto end;
401 }
402
403 /* TBD: Resources must be ordered. */
404
405 /*
406 * First we reference all power resources required in the target list
407 * (e.g. so the device doesn't lose power while transitioning).
408 */
Len Brown4be44fc2005-08-05 00:44:28 -0400409 for (i = 0; i < tl->count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 result = acpi_power_on(tl->handles[i]);
411 if (result)
412 goto end;
413 }
414
415 /*
416 * Then we dereference all power resources used in the current list.
417 */
Len Brown4be44fc2005-08-05 00:44:28 -0400418 for (i = 0; i < cl->count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 result = acpi_power_off_device(cl->handles[i]);
420 if (result)
421 goto end;
422 }
423
424 /* We shouldn't change the state till all above operations succeed */
425 device->power.state = state;
Len Brown4be44fc2005-08-05 00:44:28 -0400426 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (result)
Len Browncece9292006-06-26 23:04:31 -0400428 printk(KERN_WARNING PREFIX "Transitioning device [%s] to D%d\n",
429 device->pnp.bus_id, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Patrick Mocheld550d982006-06-27 00:41:40 -0400431 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434/* --------------------------------------------------------------------------
435 FS Interface (/proc)
436 -------------------------------------------------------------------------- */
437
Len Brown4be44fc2005-08-05 00:44:28 -0400438static struct proc_dir_entry *acpi_power_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440static int acpi_power_seq_show(struct seq_file *seq, void *offset)
441{
442 struct acpi_power_resource *resource = NULL;
443
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
445 resource = (struct acpi_power_resource *)seq->private;
446
447 if (!resource)
448 goto end;
449
450 seq_puts(seq, "state: ");
451 switch (resource->state) {
452 case ACPI_POWER_RESOURCE_STATE_ON:
453 seq_puts(seq, "on\n");
454 break;
455 case ACPI_POWER_RESOURCE_STATE_OFF:
456 seq_puts(seq, "off\n");
457 break;
458 default:
459 seq_puts(seq, "unknown\n");
460 break;
461 }
462
463 seq_printf(seq, "system level: S%d\n"
Len Brown4be44fc2005-08-05 00:44:28 -0400464 "order: %d\n"
465 "reference count: %d\n",
466 resource->system_level,
467 resource->order, resource->references);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Len Brown4be44fc2005-08-05 00:44:28 -0400469 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400470 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
473static int acpi_power_open_fs(struct inode *inode, struct file *file)
474{
475 return single_open(file, acpi_power_seq_show, PDE(inode)->data);
476}
477
Len Brown4be44fc2005-08-05 00:44:28 -0400478static int acpi_power_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
Len Brown4be44fc2005-08-05 00:44:28 -0400480 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400484 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 if (!acpi_device_dir(device)) {
487 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400488 acpi_power_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400490 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
492
493 /* 'status' [R] */
494 entry = create_proc_entry(ACPI_POWER_FILE_STATUS,
Len Brown4be44fc2005-08-05 00:44:28 -0400495 S_IRUGO, acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400497 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 else {
499 entry->proc_fops = &acpi_power_fops;
500 entry->data = acpi_driver_data(device);
501 }
502
Patrick Mocheld550d982006-06-27 00:41:40 -0400503 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504}
505
Len Brown4be44fc2005-08-05 00:44:28 -0400506static int acpi_power_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 if (acpi_device_dir(device)) {
510 remove_proc_entry(ACPI_POWER_FILE_STATUS,
511 acpi_device_dir(device));
512 remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
513 acpi_device_dir(device) = NULL;
514 }
515
Patrick Mocheld550d982006-06-27 00:41:40 -0400516 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519/* --------------------------------------------------------------------------
520 Driver Interface
521 -------------------------------------------------------------------------- */
522
Len Brown4be44fc2005-08-05 00:44:28 -0400523static int acpi_power_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524{
Len Brown4be44fc2005-08-05 00:44:28 -0400525 int result = 0;
526 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 struct acpi_power_resource *resource = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -0400528 union acpi_object acpi_object;
529 struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400533 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 resource = kmalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
536 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400537 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 memset(resource, 0, sizeof(struct acpi_power_resource));
539
Patrick Mochel41598572006-05-19 16:54:40 -0400540 resource->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 strcpy(resource->name, device->pnp.bus_id);
542 strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
543 strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
544 acpi_driver_data(device) = resource;
545
546 /* Evalute the object to get the system level and resource order. */
Patrick Mochel5fbc19e2006-05-19 16:54:43 -0400547 status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (ACPI_FAILURE(status)) {
549 result = -ENODEV;
550 goto end;
551 }
552 resource->system_level = acpi_object.power_resource.system_level;
553 resource->order = acpi_object.power_resource.resource_order;
554
555 result = acpi_power_get_state(resource);
556 if (result)
557 goto end;
558
559 switch (resource->state) {
560 case ACPI_POWER_RESOURCE_STATE_ON:
561 device->power.state = ACPI_STATE_D0;
562 break;
563 case ACPI_POWER_RESOURCE_STATE_OFF:
564 device->power.state = ACPI_STATE_D3;
565 break;
566 default:
567 device->power.state = ACPI_STATE_UNKNOWN;
568 break;
569 }
570
571 result = acpi_power_add_fs(device);
572 if (result)
573 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Len Brown4be44fc2005-08-05 00:44:28 -0400575 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
576 acpi_device_bid(device), resource->state ? "on" : "off");
577
578 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 if (result)
580 kfree(resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400581
Patrick Mocheld550d982006-06-27 00:41:40 -0400582 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
584
Len Brown4be44fc2005-08-05 00:44:28 -0400585static int acpi_power_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586{
587 struct acpi_power_resource *resource = NULL;
588
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400591 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Len Brown4be44fc2005-08-05 00:44:28 -0400593 resource = (struct acpi_power_resource *)acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 acpi_power_remove_fs(device);
596
597 kfree(resource);
598
Patrick Mocheld550d982006-06-27 00:41:40 -0400599 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600}
601
Len Brown4be44fc2005-08-05 00:44:28 -0400602static int __init acpi_power_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603{
Len Brown4be44fc2005-08-05 00:44:28 -0400604 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
607 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400608 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 INIT_LIST_HEAD(&acpi_power_resource_list);
611
612 acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
613 if (!acpi_power_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400614 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
616 result = acpi_bus_register_driver(&acpi_power_driver);
617 if (result < 0) {
618 remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -0400619 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 }
621
Patrick Mocheld550d982006-06-27 00:41:40 -0400622 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623}
624
625subsys_initcall(acpi_power_init);