Merge Linux 2.6.23
[linux-2.6] / drivers / acpi / ac.c
1 /*
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>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <acpi/acpi_bus.h>
33 #include <acpi/acpi_drivers.h>
34
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
43
44 #define _COMPONENT              ACPI_AC_COMPONENT
45 ACPI_MODULE_NAME("ac");
46
47 MODULE_AUTHOR("Paul Diefenbaugh");
48 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
49 MODULE_LICENSE("GPL");
50
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);
53
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);
57
58 const static struct acpi_device_id ac_device_ids[] = {
59         {"ACPI0003", 0},
60         {"", 0},
61 };
62 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
63
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,
71                 },
72 };
73
74 struct acpi_ac {
75         struct acpi_device * device;
76         unsigned long state;
77 };
78
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,
84 };
85
86 /* --------------------------------------------------------------------------
87                                AC Adapter Management
88    -------------------------------------------------------------------------- */
89
90 static int acpi_ac_get_state(struct acpi_ac *ac)
91 {
92         acpi_status status = AE_OK;
93
94
95         if (!ac)
96                 return -EINVAL;
97
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;
103         }
104
105         return 0;
106 }
107
108 /* --------------------------------------------------------------------------
109                               FS Interface (/proc)
110    -------------------------------------------------------------------------- */
111
112 static struct proc_dir_entry *acpi_ac_dir;
113
114 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
115 {
116         struct acpi_ac *ac = seq->private;
117
118
119         if (!ac)
120                 return 0;
121
122         if (acpi_ac_get_state(ac)) {
123                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
124                 return 0;
125         }
126
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;
138         }
139
140         return 0;
141 }
142
143 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
144 {
145         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
146 }
147
148 static int acpi_ac_add_fs(struct acpi_device *device)
149 {
150         struct proc_dir_entry *entry = NULL;
151
152
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;
159         }
160
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;
170         }
171
172         return 0;
173 }
174
175 static int acpi_ac_remove_fs(struct acpi_device *device)
176 {
177
178         if (acpi_device_dir(device)) {
179                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
180
181                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
182                 acpi_device_dir(device) = NULL;
183         }
184
185         return 0;
186 }
187
188 /* --------------------------------------------------------------------------
189                                    Driver Model
190    -------------------------------------------------------------------------- */
191
192 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
193 {
194         struct acpi_ac *ac = data;
195         struct acpi_device *device = NULL;
196
197
198         if (!ac)
199                 return;
200
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_proc_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;
216         }
217
218         return;
219 }
220
221 static int acpi_ac_add(struct acpi_device *device)
222 {
223         int result = 0;
224         acpi_status status = AE_OK;
225         struct acpi_ac *ac = NULL;
226
227
228         if (!device)
229                 return -EINVAL;
230
231         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
232         if (!ac)
233                 return -ENOMEM;
234
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;
239
240         result = acpi_ac_get_state(ac);
241         if (result)
242                 goto end;
243
244         result = acpi_ac_add_fs(device);
245         if (result)
246                 goto end;
247
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;
254         }
255
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");
259
260       end:
261         if (result) {
262                 acpi_ac_remove_fs(device);
263                 kfree(ac);
264         }
265
266         return result;
267 }
268
269 static int acpi_ac_remove(struct acpi_device *device, int type)
270 {
271         acpi_status status = AE_OK;
272         struct acpi_ac *ac = NULL;
273
274
275         if (!device || !acpi_driver_data(device))
276                 return -EINVAL;
277
278         ac = acpi_driver_data(device);
279
280         status = acpi_remove_notify_handler(device->handle,
281                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
282
283         acpi_ac_remove_fs(device);
284
285         kfree(ac);
286
287         return 0;
288 }
289
290 static int __init acpi_ac_init(void)
291 {
292         int result;
293
294         if (acpi_disabled)
295                 return -ENODEV;
296
297         acpi_ac_dir = acpi_lock_ac_dir();
298         if (!acpi_ac_dir)
299                 return -ENODEV;
300
301         result = acpi_bus_register_driver(&acpi_ac_driver);
302         if (result < 0) {
303                 acpi_unlock_ac_dir(acpi_ac_dir);
304                 return -ENODEV;
305         }
306
307         return 0;
308 }
309
310 static void __exit acpi_ac_exit(void)
311 {
312
313         acpi_bus_unregister_driver(&acpi_ac_driver);
314
315         acpi_unlock_ac_dir(acpi_ac_dir);
316
317         return;
318 }
319
320 module_init(acpi_ac_init);
321 module_exit(acpi_ac_exit);