95223d8c5eccbeddc6701285323ea37e0d0a4fbf
[linux-2.6.git] / 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_DRIVER_NAME             "ACPI AC Adapter Driver"
39 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
40 #define ACPI_AC_FILE_STATE              "state"
41 #define ACPI_AC_NOTIFY_STATUS           0x80
42 #define ACPI_AC_STATUS_OFFLINE          0x00
43 #define ACPI_AC_STATUS_ONLINE           0x01
44 #define ACPI_AC_STATUS_UNKNOWN          0xFF
45
46 #define _COMPONENT              ACPI_AC_COMPONENT
47 ACPI_MODULE_NAME("acpi_ac")
48
49     MODULE_AUTHOR("Paul Diefenbaugh");
50 MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
51 MODULE_LICENSE("GPL");
52
53 static int acpi_ac_add(struct acpi_device *device);
54 static int acpi_ac_remove(struct acpi_device *device, int type);
55 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
56
57 static struct acpi_driver acpi_ac_driver = {
58         .name = ACPI_AC_DRIVER_NAME,
59         .class = ACPI_AC_CLASS,
60         .ids = ACPI_AC_HID,
61         .ops = {
62                 .add = acpi_ac_add,
63                 .remove = acpi_ac_remove,
64                 },
65 };
66
67 struct acpi_ac {
68         acpi_handle handle;
69         unsigned long state;
70 };
71
72 static struct file_operations acpi_ac_fops = {
73         .open = acpi_ac_open_fs,
74         .read = seq_read,
75         .llseek = seq_lseek,
76         .release = single_release,
77 };
78
79 /* --------------------------------------------------------------------------
80                                AC Adapter Management
81    -------------------------------------------------------------------------- */
82
83 static int acpi_ac_get_state(struct acpi_ac *ac)
84 {
85         acpi_status status = AE_OK;
86
87         ACPI_FUNCTION_TRACE("acpi_ac_get_state");
88
89         if (!ac)
90                 return_VALUE(-EINVAL);
91
92         status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state);
93         if (ACPI_FAILURE(status)) {
94                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
95                 ac->state = ACPI_AC_STATUS_UNKNOWN;
96                 return_VALUE(-ENODEV);
97         }
98
99         return_VALUE(0);
100 }
101
102 /* --------------------------------------------------------------------------
103                               FS Interface (/proc)
104    -------------------------------------------------------------------------- */
105
106 static struct proc_dir_entry *acpi_ac_dir;
107
108 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
109 {
110         struct acpi_ac *ac = (struct acpi_ac *)seq->private;
111
112         ACPI_FUNCTION_TRACE("acpi_ac_seq_show");
113
114         if (!ac)
115                 return_VALUE(0);
116
117         if (acpi_ac_get_state(ac)) {
118                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
119                 return_VALUE(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_VALUE(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         ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
148
149         if (!acpi_device_dir(device)) {
150                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
151                                                      acpi_ac_dir);
152                 if (!acpi_device_dir(device))
153                         return_VALUE(-ENODEV);
154                 acpi_device_dir(device)->owner = THIS_MODULE;
155         }
156
157         /* 'state' [R] */
158         entry = create_proc_entry(ACPI_AC_FILE_STATE,
159                                   S_IRUGO, acpi_device_dir(device));
160         if (!entry)
161                 return_VALUE(-ENODEV);
162         else {
163                 entry->proc_fops = &acpi_ac_fops;
164                 entry->data = acpi_driver_data(device);
165                 entry->owner = THIS_MODULE;
166         }
167
168         return_VALUE(0);
169 }
170
171 static int acpi_ac_remove_fs(struct acpi_device *device)
172 {
173         ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
174
175         if (acpi_device_dir(device)) {
176                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
177
178                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
179                 acpi_device_dir(device) = NULL;
180         }
181
182         return_VALUE(0);
183 }
184
185 /* --------------------------------------------------------------------------
186                                    Driver Model
187    -------------------------------------------------------------------------- */
188
189 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
190 {
191         struct acpi_ac *ac = (struct acpi_ac *)data;
192         struct acpi_device *device = NULL;
193
194         ACPI_FUNCTION_TRACE("acpi_ac_notify");
195
196         if (!ac)
197                 return_VOID;
198
199         if (acpi_bus_get_device(ac->handle, &device))
200                 return_VOID;
201
202         switch (event) {
203         case ACPI_AC_NOTIFY_STATUS:
204                 acpi_ac_get_state(ac);
205                 acpi_bus_generate_event(device, event, (u32) ac->state);
206                 break;
207         default:
208                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
209                                   "Unsupported event [0x%x]\n", event));
210                 break;
211         }
212
213         return_VOID;
214 }
215
216 static int acpi_ac_add(struct acpi_device *device)
217 {
218         int result = 0;
219         acpi_status status = AE_OK;
220         struct acpi_ac *ac = NULL;
221
222         ACPI_FUNCTION_TRACE("acpi_ac_add");
223
224         if (!device)
225                 return_VALUE(-EINVAL);
226
227         ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
228         if (!ac)
229                 return_VALUE(-ENOMEM);
230         memset(ac, 0, sizeof(struct acpi_ac));
231
232         ac->handle = device->handle;
233         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
234         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
235         acpi_driver_data(device) = ac;
236
237         result = acpi_ac_get_state(ac);
238         if (result)
239                 goto end;
240
241         result = acpi_ac_add_fs(device);
242         if (result)
243                 goto end;
244
245         status = acpi_install_notify_handler(ac->handle,
246                                              ACPI_DEVICE_NOTIFY, acpi_ac_notify,
247                                              ac);
248         if (ACPI_FAILURE(status)) {
249                 result = -ENODEV;
250                 goto end;
251         }
252
253         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
254                acpi_device_name(device), acpi_device_bid(device),
255                ac->state ? "on-line" : "off-line");
256
257       end:
258         if (result) {
259                 acpi_ac_remove_fs(device);
260                 kfree(ac);
261         }
262
263         return_VALUE(result);
264 }
265
266 static int acpi_ac_remove(struct acpi_device *device, int type)
267 {
268         acpi_status status = AE_OK;
269         struct acpi_ac *ac = NULL;
270
271         ACPI_FUNCTION_TRACE("acpi_ac_remove");
272
273         if (!device || !acpi_driver_data(device))
274                 return_VALUE(-EINVAL);
275
276         ac = (struct acpi_ac *)acpi_driver_data(device);
277
278         status = acpi_remove_notify_handler(ac->handle,
279                                             ACPI_DEVICE_NOTIFY, acpi_ac_notify);
280
281         acpi_ac_remove_fs(device);
282
283         kfree(ac);
284
285         return_VALUE(0);
286 }
287
288 static int __init acpi_ac_init(void)
289 {
290         int result = 0;
291
292         ACPI_FUNCTION_TRACE("acpi_ac_init");
293
294         acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
295         if (!acpi_ac_dir)
296                 return_VALUE(-ENODEV);
297         acpi_ac_dir->owner = THIS_MODULE;
298
299         result = acpi_bus_register_driver(&acpi_ac_driver);
300         if (result < 0) {
301                 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
302                 return_VALUE(-ENODEV);
303         }
304
305         return_VALUE(0);
306 }
307
308 static void __exit acpi_ac_exit(void)
309 {
310         ACPI_FUNCTION_TRACE("acpi_ac_exit");
311
312         acpi_bus_unregister_driver(&acpi_ac_driver);
313
314         remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
315
316         return_VOID;
317 }
318
319 module_init(acpi_ac_init);
320 module_exit(acpi_ac_exit);