ACPI: don't duplicate input events on netlink
[linux-2.6/mini2440.git] / drivers / acpi / ac.c
blobb53c2cfcafd30c954879bae741173013aaaa4785
1 /*
2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <acpi/acpi_bus.h>
33 #include <acpi/acpi_drivers.h>
35 #define ACPI_AC_COMPONENT 0x00020000
36 #define ACPI_AC_CLASS "ac_adapter"
37 #define ACPI_AC_DEVICE_NAME "AC Adapter"
38 #define ACPI_AC_FILE_STATE "state"
39 #define ACPI_AC_NOTIFY_STATUS 0x80
40 #define ACPI_AC_STATUS_OFFLINE 0x00
41 #define ACPI_AC_STATUS_ONLINE 0x01
42 #define ACPI_AC_STATUS_UNKNOWN 0xFF
44 #define _COMPONENT ACPI_AC_COMPONENT
45 ACPI_MODULE_NAME("ac");
47 MODULE_AUTHOR("Paul Diefenbaugh");
48 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
49 MODULE_LICENSE("GPL");
51 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
52 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
54 static int acpi_ac_add(struct acpi_device *device);
55 static int acpi_ac_remove(struct acpi_device *device, int type);
56 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
58 const static struct acpi_device_id ac_device_ids[] = {
59 {"ACPI0003", 0},
60 {"", 0},
62 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
64 static struct acpi_driver acpi_ac_driver = {
65 .name = "ac",
66 .class = ACPI_AC_CLASS,
67 .ids = ac_device_ids,
68 .ops = {
69 .add = acpi_ac_add,
70 .remove = acpi_ac_remove,
74 struct acpi_ac {
75 struct acpi_device * device;
76 unsigned long state;
79 static const struct file_operations acpi_ac_fops = {
80 .open = acpi_ac_open_fs,
81 .read = seq_read,
82 .llseek = seq_lseek,
83 .release = single_release,
86 /* --------------------------------------------------------------------------
87 AC Adapter Management
88 -------------------------------------------------------------------------- */
90 static int acpi_ac_get_state(struct acpi_ac *ac)
92 acpi_status status = AE_OK;
95 if (!ac)
96 return -EINVAL;
98 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
99 if (ACPI_FAILURE(status)) {
100 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
101 ac->state = ACPI_AC_STATUS_UNKNOWN;
102 return -ENODEV;
105 return 0;
108 /* --------------------------------------------------------------------------
109 FS Interface (/proc)
110 -------------------------------------------------------------------------- */
112 static struct proc_dir_entry *acpi_ac_dir;
114 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
116 struct acpi_ac *ac = seq->private;
119 if (!ac)
120 return 0;
122 if (acpi_ac_get_state(ac)) {
123 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
124 return 0;
127 seq_puts(seq, "state: ");
128 switch (ac->state) {
129 case ACPI_AC_STATUS_OFFLINE:
130 seq_puts(seq, "off-line\n");
131 break;
132 case ACPI_AC_STATUS_ONLINE:
133 seq_puts(seq, "on-line\n");
134 break;
135 default:
136 seq_puts(seq, "unknown\n");
137 break;
140 return 0;
143 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
145 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
148 static int acpi_ac_add_fs(struct acpi_device *device)
150 struct proc_dir_entry *entry = NULL;
153 if (!acpi_device_dir(device)) {
154 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
155 acpi_ac_dir);
156 if (!acpi_device_dir(device))
157 return -ENODEV;
158 acpi_device_dir(device)->owner = THIS_MODULE;
161 /* 'state' [R] */
162 entry = create_proc_entry(ACPI_AC_FILE_STATE,
163 S_IRUGO, acpi_device_dir(device));
164 if (!entry)
165 return -ENODEV;
166 else {
167 entry->proc_fops = &acpi_ac_fops;
168 entry->data = acpi_driver_data(device);
169 entry->owner = THIS_MODULE;
172 return 0;
175 static int acpi_ac_remove_fs(struct acpi_device *device)
178 if (acpi_device_dir(device)) {
179 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
181 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
182 acpi_device_dir(device) = NULL;
185 return 0;
188 /* --------------------------------------------------------------------------
189 Driver Model
190 -------------------------------------------------------------------------- */
192 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
194 struct acpi_ac *ac = data;
195 struct acpi_device *device = NULL;
198 if (!ac)
199 return;
201 device = ac->device;
202 switch (event) {
203 case ACPI_AC_NOTIFY_STATUS:
204 case ACPI_NOTIFY_BUS_CHECK:
205 case ACPI_NOTIFY_DEVICE_CHECK:
206 acpi_ac_get_state(ac);
207 acpi_bus_generate_event(device, event, (u32) ac->state);
208 acpi_bus_generate_netlink_event(device->pnp.device_class,
209 device->dev.bus_id, event,
210 (u32) ac->state);
211 break;
212 default:
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
214 "Unsupported event [0x%x]\n", event));
215 break;
218 return;
221 static int acpi_ac_add(struct acpi_device *device)
223 int result = 0;
224 acpi_status status = AE_OK;
225 struct acpi_ac *ac = NULL;
228 if (!device)
229 return -EINVAL;
231 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
232 if (!ac)
233 return -ENOMEM;
235 ac->device = device;
236 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
237 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
238 acpi_driver_data(device) = ac;
240 result = acpi_ac_get_state(ac);
241 if (result)
242 goto end;
244 result = acpi_ac_add_fs(device);
245 if (result)
246 goto end;
248 status = acpi_install_notify_handler(device->handle,
249 ACPI_ALL_NOTIFY, acpi_ac_notify,
250 ac);
251 if (ACPI_FAILURE(status)) {
252 result = -ENODEV;
253 goto end;
256 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
257 acpi_device_name(device), acpi_device_bid(device),
258 ac->state ? "on-line" : "off-line");
260 end:
261 if (result) {
262 acpi_ac_remove_fs(device);
263 kfree(ac);
266 return result;
269 static int acpi_ac_remove(struct acpi_device *device, int type)
271 acpi_status status = AE_OK;
272 struct acpi_ac *ac = NULL;
275 if (!device || !acpi_driver_data(device))
276 return -EINVAL;
278 ac = acpi_driver_data(device);
280 status = acpi_remove_notify_handler(device->handle,
281 ACPI_ALL_NOTIFY, acpi_ac_notify);
283 acpi_ac_remove_fs(device);
285 kfree(ac);
287 return 0;
290 static int __init acpi_ac_init(void)
292 int result;
294 if (acpi_disabled)
295 return -ENODEV;
297 acpi_ac_dir = acpi_lock_ac_dir();
298 if (!acpi_ac_dir)
299 return -ENODEV;
301 result = acpi_bus_register_driver(&acpi_ac_driver);
302 if (result < 0) {
303 acpi_unlock_ac_dir(acpi_ac_dir);
304 return -ENODEV;
307 return 0;
310 static void __exit acpi_ac_exit(void)
313 acpi_bus_unregister_driver(&acpi_ac_driver);
315 acpi_unlock_ac_dir(acpi_ac_dir);
317 return;
320 module_init(acpi_ac_init);
321 module_exit(acpi_ac_exit);