blob: 0df8fcb687d6f00ce400c1b4677019a34af236a1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
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#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/types.h>
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030030#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/proc_fs.h>
32#include <linux/seq_file.h>
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -080033#endif
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -050034#ifdef CONFIG_ACPI_SYSFS_POWER
Alexey Starikovskiyd5b4a3d2007-09-26 19:44:06 +040035#include <linux/power_supply.h>
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -050036#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <acpi/acpi_bus.h>
38#include <acpi/acpi_drivers.h>
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define ACPI_AC_CLASS "ac_adapter"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define ACPI_AC_DEVICE_NAME "AC Adapter"
42#define ACPI_AC_FILE_STATE "state"
43#define ACPI_AC_NOTIFY_STATUS 0x80
44#define ACPI_AC_STATUS_OFFLINE 0x00
45#define ACPI_AC_STATUS_ONLINE 0x01
46#define ACPI_AC_STATUS_UNKNOWN 0xFF
47
48#define _COMPONENT ACPI_AC_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050049ACPI_MODULE_NAME("ac");
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Len Brownf52fd662007-02-12 22:42:12 -050051MODULE_AUTHOR("Paul Diefenbaugh");
Len Brown7cda93e2007-02-12 23:50:02 -050052MODULE_DESCRIPTION("ACPI AC Adapter Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070053MODULE_LICENSE("GPL");
54
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030055#ifdef CONFIG_ACPI_PROCFS_POWER
Rich Townsend3f86b832006-07-01 11:36:54 -040056extern struct proc_dir_entry *acpi_lock_ac_dir(void);
57extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -080058static int acpi_ac_open_fs(struct inode *inode, struct file *file);
59#endif
Rich Townsend3f86b832006-07-01 11:36:54 -040060
Len Brown4be44fc2005-08-05 00:44:28 -040061static int acpi_ac_add(struct acpi_device *device);
62static int acpi_ac_remove(struct acpi_device *device, int type);
Alexey Starikovskiy5bfeca32007-11-14 17:00:39 -080063static int acpi_ac_resume(struct acpi_device *device);
Bjorn Helgaas48fe1122009-04-30 09:35:42 -060064static void acpi_ac_notify(struct acpi_device *device, u32 event);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Tobias Klauserb299c222008-04-21 22:24:53 +000066static const struct acpi_device_id ac_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020067 {"ACPI0003", 0},
68 {"", 0},
69};
70MODULE_DEVICE_TABLE(acpi, ac_device_ids);
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072static struct acpi_driver acpi_ac_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050073 .name = "ac",
Len Brown4be44fc2005-08-05 00:44:28 -040074 .class = ACPI_AC_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020075 .ids = ac_device_ids,
Bjorn Helgaas48fe1122009-04-30 09:35:42 -060076 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
Len Brown4be44fc2005-08-05 00:44:28 -040077 .ops = {
78 .add = acpi_ac_add,
79 .remove = acpi_ac_remove,
Alexey Starikovskiy5bfeca32007-11-14 17:00:39 -080080 .resume = acpi_ac_resume,
Bjorn Helgaas48fe1122009-04-30 09:35:42 -060081 .notify = acpi_ac_notify,
Len Brown4be44fc2005-08-05 00:44:28 -040082 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070083};
84
85struct acpi_ac {
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -050086#ifdef CONFIG_ACPI_SYSFS_POWER
Alexey Starikovskiyd5b4a3d2007-09-26 19:44:06 +040087 struct power_supply charger;
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -050088#endif
Patrick Mochelaf961792006-05-19 16:54:32 -040089 struct acpi_device * device;
Matthew Wilcox27663c52008-10-10 02:22:59 -040090 unsigned long long state;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091};
92
Alexey Starikovskiyd5b4a3d2007-09-26 19:44:06 +040093#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
94
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030095#ifdef CONFIG_ACPI_PROCFS_POWER
Arjan van de Vend7508032006-07-04 13:06:00 -040096static const struct file_operations acpi_ac_fops = {
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -070097 .owner = THIS_MODULE,
Len Brown4be44fc2005-08-05 00:44:28 -040098 .open = acpi_ac_open_fs,
99 .read = seq_read,
100 .llseek = seq_lseek,
101 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102};
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -0800103#endif
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500104#ifdef CONFIG_ACPI_SYSFS_POWER
Alexey Starikovskiyd5b4a3d2007-09-26 19:44:06 +0400105static int get_ac_property(struct power_supply *psy,
106 enum power_supply_property psp,
107 union power_supply_propval *val)
108{
109 struct acpi_ac *ac = to_acpi_ac(psy);
110 switch (psp) {
111 case POWER_SUPPLY_PROP_ONLINE:
112 val->intval = ac->state;
113 break;
114 default:
115 return -EINVAL;
116 }
117 return 0;
118}
119
120static enum power_supply_property ac_props[] = {
121 POWER_SUPPLY_PROP_ONLINE,
122};
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500123#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124/* --------------------------------------------------------------------------
125 AC Adapter Management
126 -------------------------------------------------------------------------- */
127
Len Brown4be44fc2005-08-05 00:44:28 -0400128static int acpi_ac_get_state(struct acpi_ac *ac)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
Len Brown4be44fc2005-08-05 00:44:28 -0400130 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 if (!ac)
Patrick Mocheld550d982006-06-27 00:41:40 -0400134 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Patrick Mochela6ba5eb2006-05-19 16:54:41 -0400136 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400138 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 ac->state = ACPI_AC_STATUS_UNKNOWN;
Patrick Mocheld550d982006-06-27 00:41:40 -0400140 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 }
Len Brown4be44fc2005-08-05 00:44:28 -0400142
Patrick Mocheld550d982006-06-27 00:41:40 -0400143 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +0300146#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147/* --------------------------------------------------------------------------
148 FS Interface (/proc)
149 -------------------------------------------------------------------------- */
150
Len Brown4be44fc2005-08-05 00:44:28 -0400151static struct proc_dir_entry *acpi_ac_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
154{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200155 struct acpi_ac *ac = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
158 if (!ac)
Patrick Mocheld550d982006-06-27 00:41:40 -0400159 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161 if (acpi_ac_get_state(ac)) {
162 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400163 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
166 seq_puts(seq, "state: ");
167 switch (ac->state) {
168 case ACPI_AC_STATUS_OFFLINE:
169 seq_puts(seq, "off-line\n");
170 break;
171 case ACPI_AC_STATUS_ONLINE:
172 seq_puts(seq, "on-line\n");
173 break;
174 default:
175 seq_puts(seq, "unknown\n");
176 break;
177 }
178
Patrick Mocheld550d982006-06-27 00:41:40 -0400179 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180}
Len Brown4be44fc2005-08-05 00:44:28 -0400181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182static int acpi_ac_open_fs(struct inode *inode, struct file *file)
183{
184 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
185}
186
Len Brown4be44fc2005-08-05 00:44:28 -0400187static int acpi_ac_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
Len Brown4be44fc2005-08-05 00:44:28 -0400189 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 if (!acpi_device_dir(device)) {
193 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400194 acpi_ac_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400196 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 }
198
199 /* 'state' [R] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700200 entry = proc_create_data(ACPI_AC_FILE_STATE,
201 S_IRUGO, acpi_device_dir(device),
202 &acpi_ac_fops, acpi_driver_data(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400204 return -ENODEV;
Patrick Mocheld550d982006-06-27 00:41:40 -0400205 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
Len Brown4be44fc2005-08-05 00:44:28 -0400208static int acpi_ac_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211 if (acpi_device_dir(device)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400212 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
215 acpi_device_dir(device) = NULL;
216 }
217
Patrick Mocheld550d982006-06-27 00:41:40 -0400218 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -0800220#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222/* --------------------------------------------------------------------------
223 Driver Model
224 -------------------------------------------------------------------------- */
225
Bjorn Helgaas48fe1122009-04-30 09:35:42 -0600226static void acpi_ac_notify(struct acpi_device *device, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227{
Bjorn Helgaas48fe1122009-04-30 09:35:42 -0600228 struct acpi_ac *ac = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 if (!ac)
Patrick Mocheld550d982006-06-27 00:41:40 -0400232 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 switch (event) {
Len Brownf163ff52008-06-14 01:26:37 -0400235 default:
236 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
237 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 case ACPI_AC_NOTIFY_STATUS:
Christian Lupien03d78252004-08-19 01:26:00 -0400239 case ACPI_NOTIFY_BUS_CHECK:
240 case ACPI_NOTIFY_DEVICE_CHECK:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 acpi_ac_get_state(ac);
Len Brown14e04fb2007-08-23 15:20:26 -0400242 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
Zhang Rui962ce8c2007-08-23 01:24:31 +0800243 acpi_bus_generate_netlink_event(device->pnp.device_class,
Kay Sievers07944692008-10-30 01:18:59 +0100244 dev_name(&device->dev), event,
Zhang Rui962ce8c2007-08-23 01:24:31 +0800245 (u32) ac->state);
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500246#ifdef CONFIG_ACPI_SYSFS_POWER
Alexey Starikovskiyd5b4a3d2007-09-26 19:44:06 +0400247 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500248#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 }
250
Patrick Mocheld550d982006-06-27 00:41:40 -0400251 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
253
Len Brown4be44fc2005-08-05 00:44:28 -0400254static int acpi_ac_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
Len Brown4be44fc2005-08-05 00:44:28 -0400256 int result = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400257 struct acpi_ac *ac = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400261 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Burman Yan36bcbec2006-12-19 12:56:11 -0800263 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 if (!ac)
Patrick Mocheld550d982006-06-27 00:41:40 -0400265 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Patrick Mochelaf961792006-05-19 16:54:32 -0400267 ac->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
269 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700270 device->driver_data = ac;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272 result = acpi_ac_get_state(ac);
273 if (result)
274 goto end;
275
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +0300276#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 result = acpi_ac_add_fs(device);
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -0800278#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (result)
280 goto end;
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500281#ifdef CONFIG_ACPI_SYSFS_POWER
Alexey Starikovskiyd5b4a3d2007-09-26 19:44:06 +0400282 ac->charger.name = acpi_device_bid(device);
283 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
284 ac->charger.properties = ac_props;
285 ac->charger.num_properties = ARRAY_SIZE(ac_props);
286 ac->charger.get_property = get_ac_property;
287 power_supply_register(&ac->device->dev, &ac->charger);
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500288#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Len Brown4be44fc2005-08-05 00:44:28 -0400290 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
291 acpi_device_name(device), acpi_device_bid(device),
292 ac->state ? "on-line" : "off-line");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Len Brown4be44fc2005-08-05 00:44:28 -0400294 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 if (result) {
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +0300296#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 acpi_ac_remove_fs(device);
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -0800298#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 kfree(ac);
300 }
301
Patrick Mocheld550d982006-06-27 00:41:40 -0400302 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303}
304
Alexey Starikovskiy5bfeca32007-11-14 17:00:39 -0800305static int acpi_ac_resume(struct acpi_device *device)
306{
307 struct acpi_ac *ac;
308 unsigned old_state;
309 if (!device || !acpi_driver_data(device))
310 return -EINVAL;
311 ac = acpi_driver_data(device);
312 old_state = ac->state;
313 if (acpi_ac_get_state(ac))
314 return 0;
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500315#ifdef CONFIG_ACPI_SYSFS_POWER
Alexey Starikovskiy5bfeca32007-11-14 17:00:39 -0800316 if (old_state != ac->state)
317 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500318#endif
Alexey Starikovskiy5bfeca32007-11-14 17:00:39 -0800319 return 0;
320}
321
Len Brown4be44fc2005-08-05 00:44:28 -0400322static int acpi_ac_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
Len Brown4be44fc2005-08-05 00:44:28 -0400324 struct acpi_ac *ac = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400328 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200330 ac = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500332#ifdef CONFIG_ACPI_SYSFS_POWER
Alexey Starikovskiyd5b4a3d2007-09-26 19:44:06 +0400333 if (ac->charger.dev)
334 power_supply_unregister(&ac->charger);
Alexey Starikovskiy97749cd2008-01-01 14:27:24 -0500335#endif
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +0300336#ifdef CONFIG_ACPI_PROCFS_POWER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 acpi_ac_remove_fs(device);
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -0800338#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340 kfree(ac);
341
Patrick Mocheld550d982006-06-27 00:41:40 -0400342 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343}
344
Len Brown4be44fc2005-08-05 00:44:28 -0400345static int __init acpi_ac_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
Rich Townsend3f86b832006-07-01 11:36:54 -0400347 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Pavel Machek4d8316d2006-08-14 22:37:22 -0700349 if (acpi_disabled)
350 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +0300352#ifdef CONFIG_ACPI_PROCFS_POWER
Rich Townsend3f86b832006-07-01 11:36:54 -0400353 acpi_ac_dir = acpi_lock_ac_dir();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (!acpi_ac_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400355 return -ENODEV;
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -0800356#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 result = acpi_bus_register_driver(&acpi_ac_driver);
359 if (result < 0) {
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +0300360#ifdef CONFIG_ACPI_PROCFS_POWER
Rich Townsend3f86b832006-07-01 11:36:54 -0400361 acpi_unlock_ac_dir(acpi_ac_dir);
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -0800362#endif
Patrick Mocheld550d982006-06-27 00:41:40 -0400363 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 }
365
Patrick Mocheld550d982006-06-27 00:41:40 -0400366 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367}
368
Len Brown4be44fc2005-08-05 00:44:28 -0400369static void __exit acpi_ac_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372 acpi_bus_unregister_driver(&acpi_ac_driver);
373
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +0300374#ifdef CONFIG_ACPI_PROCFS_POWER
Rich Townsend3f86b832006-07-01 11:36:54 -0400375 acpi_unlock_ac_dir(acpi_ac_dir);
Andrey Borzenkov8a246ee2007-11-14 17:00:37 -0800376#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Patrick Mocheld550d982006-06-27 00:41:40 -0400378 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379}
380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381module_init(acpi_ac_init);
382module_exit(acpi_ac_exit);