Merge branch 'for-linus' of ssh://master.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[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_HID                     "ACPI0003"
38 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
39 #define ACPI_AC_FILE_STATE              "state"
40 #define ACPI_AC_NOTIFY_STATUS           0x80
41 #define ACPI_AC_STATUS_OFFLINE          0x00
42 #define ACPI_AC_STATUS_ONLINE           0x01
43 #define ACPI_AC_STATUS_UNKNOWN          0xFF
44
45 #define _COMPONENT              ACPI_AC_COMPONENT
46 ACPI_MODULE_NAME("ac");
47
48 MODULE_AUTHOR("Paul Diefenbaugh");
49 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
50 MODULE_LICENSE("GPL");
51
52 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
53 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
54
55 static int acpi_ac_add(struct acpi_device *device);
56 static int acpi_ac_remove(struct acpi_device *device, int type);
57 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
58
59 static struct acpi_driver acpi_ac_driver = {
60         .name = "ac",
61         .class = ACPI_AC_CLASS,
62         .ids = ACPI_AC_HID,
63         .ops = {
64                 .add = acpi_ac_add,
65                 .remove = acpi_ac_remove,
66                 },
67 };
68
69 struct acpi_ac {
70         struct acpi_device * device;
71         unsigned long state;
72 };
73
74 static const struct file_operations acpi_ac_fops = {
75         .open = acpi_ac_open_fs,
76         .read = seq_read,
77         .llseek = seq_lseek,
78         .release = single_release,
79 };
80
81 /* --------------------------------------------------------------------------
82                                AC Adapter Management
83    -------------------------------------------------------------------------- */
84
85 static int acpi_ac_get_state(struct acpi_ac *ac)
86 {
87         acpi_status status = AE_OK;
88
89
90         if (!ac)
91                 return -EINVAL;
92
93         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
94         if (ACPI_FAILURE(status)) {
95                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
96                 ac->state = ACPI_AC_STATUS_UNKNOWN;
97                 return -ENODEV;
98         }
99
100         return 0;
101 }
102
103 /* --------------------------------------------------------------------------
104                               FS Interface (/proc)
105    -------------------------------------------------------------------------- */
106
107 static struct proc_dir_entry *acpi_ac_dir;
108
109 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
110 {
111         struct acpi_ac *ac = seq->private;
112
113
114         if (!ac)
115                 return 0;
116
117         if (acpi_ac_get_state(ac)) {
118                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
119                 return 0;
120         }
121
122         seq_puts(seq, "state:                   ");
123         switch (ac->state) {
124         case ACPI_AC_STATUS_OFFLINE:
125                 seq_puts(seq, "off-line\n");
126                 break;
127         case ACPI_AC_STATUS_ONLINE:
128                 seq_puts(seq, "on-line\n");
129                 break;
130         default:
131                 seq_puts(seq, "unknown\n");
132                 break;
133         }
134
135         return 0;
136 }
137
138 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
139 {
140         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
141 }
142
143 static int acpi_ac_add_fs(struct acpi_device *device)
144 {
145         struct proc_dir_entry *entry = NULL;
146
147
148         if (!acpi_device_dir(device)) {
149                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
150                                                      acpi_ac_dir);
151                 if (!acpi_device_dir(device))
152                         return -ENODEV;
153                 acpi_device_dir(device)->owner = THIS_MODULE;
154         }
155
156         /* 'state' [R] */
157         entry = create_proc_entry(ACPI_AC_FILE_STATE,
158                                   S_IRUGO, acpi_device_dir(device));
159         if (!entry)
160                 return -ENODEV;
161         else {
162                 entry->proc_fops = &acpi_ac_fops;
163                 entry->data = acpi_driver_data(device);
164                 entry->owner = THIS_MODULE;
165         }
166
167         return 0;
168 }
169
170 static int acpi_ac_remove_fs(struct acpi_device *device)
171 {
172
173         if (acpi_device_dir(device)) {
174                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
175
176                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
177                 acpi_device_dir(device) = NULL;
178         }
179
180         return 0;
181 }
182
183 /* --------------------------------------------------------------------------
184                                    Driver Model
185    -------------------------------------------------------------------------- */
186
187 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
188 {
189         struct acpi_ac *ac = data;
190         struct acpi_device *device = NULL;
191
192
193         if (!ac)
194                 return;
195
196         device = ac->device;
197         switch (event) {
198         case ACPI_AC_NOTIFY_STATUS:
199         case ACPI_NOTIFY_BUS_CHECK:
200         case ACPI_NOTIFY_DEVICE_CHECK:
201                 acpi_ac_get_state(ac);
202                 acpi_bus_generate_event(device, event, (u32) ac->state);
203                 break;
204         default:
205                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
206                                   "Unsupported event [0x%x]\n", event));
207                 break;
208         }
209
210         return;
211 }
212
213 static int acpi_ac_add(struct acpi_device *device)
214 {
215         int result = 0;
216         acpi_status status = AE_OK;
217         struct acpi_ac *ac = NULL;
218
219
220         if (!device)
221                 return -EINVAL;
222
223         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
224         if (!ac)
225                 return -ENOMEM;
226
227         ac->device = device;
228         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
229         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
230         acpi_driver_data(device) = ac;
231
232         result = acpi_ac_get_state(ac);
233         if (result)
234                 goto end;
235
236         result = acpi_ac_add_fs(device);
237         if (result)
238                 goto end;
239
240         status = acpi_install_notify_handler(device->handle,
241                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
242                                              ac);
243         if (ACPI_FAILURE(status)) {
244                 result = -ENODEV;
245                 goto end;
246         }
247
248         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
249                acpi_device_name(device), acpi_device_bid(device),
250                ac->state ? "on-line" : "off-line");
251
252       end:
253         if (result) {
254                 acpi_ac_remove_fs(device);
255                 kfree(ac);
256         }
257
258         return result;
259 }
260
261 static int acpi_ac_remove(struct acpi_device *device, int type)
262 {
263         acpi_status status = AE_OK;
264         struct acpi_ac *ac = NULL;
265
266
267         if (!device || !acpi_driver_data(device))
268                 return -EINVAL;
269
270         ac = acpi_driver_data(device);
271
272         status = acpi_remove_notify_handler(device->handle,
273                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
274
275         acpi_ac_remove_fs(device);
276
277         kfree(ac);
278
279         return 0;
280 }
281
282 static int __init acpi_ac_init(void)
283 {
284         int result;
285
286         if (acpi_disabled)
287                 return -ENODEV;
288
289         acpi_ac_dir = acpi_lock_ac_dir();
290         if (!acpi_ac_dir)
291                 return -ENODEV;
292
293         result = acpi_bus_register_driver(&acpi_ac_driver);
294         if (result < 0) {
295                 acpi_unlock_ac_dir(acpi_ac_dir);
296                 return -ENODEV;
297         }
298
299         return 0;
300 }
301
302 static void __exit acpi_ac_exit(void)
303 {
304
305         acpi_bus_unregister_driver(&acpi_ac_driver);
306
307         acpi_unlock_ac_dir(acpi_ac_dir);
308
309         return;
310 }
311
312 module_init(acpi_ac_init);
313 module_exit(acpi_ac_exit);