Merge branch 'master' of hera.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6
[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 <linux/power_supply.h>
33 #include <acpi/acpi_bus.h>
34 #include <acpi/acpi_drivers.h>
35
36 #define ACPI_AC_COMPONENT               0x00020000
37 #define ACPI_AC_CLASS                   "ac_adapter"
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 const static struct acpi_device_id ac_device_ids[] = {
60         {"ACPI0003", 0},
61         {"", 0},
62 };
63 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
64
65 static struct acpi_driver acpi_ac_driver = {
66         .name = "ac",
67         .class = ACPI_AC_CLASS,
68         .ids = ac_device_ids,
69         .ops = {
70                 .add = acpi_ac_add,
71                 .remove = acpi_ac_remove,
72                 },
73 };
74
75 struct acpi_ac {
76         struct power_supply charger;
77         struct acpi_device * device;
78         unsigned long state;
79 };
80
81 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
82
83 static const struct file_operations acpi_ac_fops = {
84         .open = acpi_ac_open_fs,
85         .read = seq_read,
86         .llseek = seq_lseek,
87         .release = single_release,
88 };
89 static int get_ac_property(struct power_supply *psy,
90                            enum power_supply_property psp,
91                            union power_supply_propval *val)
92 {
93         struct acpi_ac *ac = to_acpi_ac(psy);
94         switch (psp) {
95         case POWER_SUPPLY_PROP_ONLINE:
96                 val->intval = ac->state;
97                 break;
98         default:
99                 return -EINVAL;
100         }
101         return 0;
102 }
103
104 static enum power_supply_property ac_props[] = {
105         POWER_SUPPLY_PROP_ONLINE,
106 };
107
108 /* --------------------------------------------------------------------------
109                                AC Adapter Management
110    -------------------------------------------------------------------------- */
111
112 static int acpi_ac_get_state(struct acpi_ac *ac)
113 {
114         acpi_status status = AE_OK;
115
116
117         if (!ac)
118                 return -EINVAL;
119
120         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
121         if (ACPI_FAILURE(status)) {
122                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
123                 ac->state = ACPI_AC_STATUS_UNKNOWN;
124                 return -ENODEV;
125         }
126
127         return 0;
128 }
129
130 /* --------------------------------------------------------------------------
131                               FS Interface (/proc)
132    -------------------------------------------------------------------------- */
133
134 static struct proc_dir_entry *acpi_ac_dir;
135
136 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
137 {
138         struct acpi_ac *ac = seq->private;
139
140
141         if (!ac)
142                 return 0;
143
144         if (acpi_ac_get_state(ac)) {
145                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
146                 return 0;
147         }
148
149         seq_puts(seq, "state:                   ");
150         switch (ac->state) {
151         case ACPI_AC_STATUS_OFFLINE:
152                 seq_puts(seq, "off-line\n");
153                 break;
154         case ACPI_AC_STATUS_ONLINE:
155                 seq_puts(seq, "on-line\n");
156                 break;
157         default:
158                 seq_puts(seq, "unknown\n");
159                 break;
160         }
161
162         return 0;
163 }
164
165 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
166 {
167         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
168 }
169
170 static int acpi_ac_add_fs(struct acpi_device *device)
171 {
172         struct proc_dir_entry *entry = NULL;
173
174
175         if (!acpi_device_dir(device)) {
176                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
177                                                      acpi_ac_dir);
178                 if (!acpi_device_dir(device))
179                         return -ENODEV;
180                 acpi_device_dir(device)->owner = THIS_MODULE;
181         }
182
183         /* 'state' [R] */
184         entry = create_proc_entry(ACPI_AC_FILE_STATE,
185                                   S_IRUGO, acpi_device_dir(device));
186         if (!entry)
187                 return -ENODEV;
188         else {
189                 entry->proc_fops = &acpi_ac_fops;
190                 entry->data = acpi_driver_data(device);
191                 entry->owner = THIS_MODULE;
192         }
193
194         return 0;
195 }
196
197 static int acpi_ac_remove_fs(struct acpi_device *device)
198 {
199
200         if (acpi_device_dir(device)) {
201                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
202
203                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
204                 acpi_device_dir(device) = NULL;
205         }
206
207         return 0;
208 }
209
210 /* --------------------------------------------------------------------------
211                                    Driver Model
212    -------------------------------------------------------------------------- */
213
214 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
215 {
216         struct acpi_ac *ac = data;
217         struct acpi_device *device = NULL;
218
219
220         if (!ac)
221                 return;
222
223         device = ac->device;
224         switch (event) {
225         case ACPI_AC_NOTIFY_STATUS:
226         case ACPI_NOTIFY_BUS_CHECK:
227         case ACPI_NOTIFY_DEVICE_CHECK:
228                 acpi_ac_get_state(ac);
229                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
230                 acpi_bus_generate_netlink_event(device->pnp.device_class,
231                                                   device->dev.bus_id, event,
232                                                   (u32) ac->state);
233                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
234                 break;
235         default:
236                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
237                                   "Unsupported event [0x%x]\n", event));
238                 break;
239         }
240
241         return;
242 }
243
244 static int acpi_ac_add(struct acpi_device *device)
245 {
246         int result = 0;
247         acpi_status status = AE_OK;
248         struct acpi_ac *ac = NULL;
249
250
251         if (!device)
252                 return -EINVAL;
253
254         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
255         if (!ac)
256                 return -ENOMEM;
257
258         ac->device = device;
259         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
260         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
261         acpi_driver_data(device) = ac;
262
263         result = acpi_ac_get_state(ac);
264         if (result)
265                 goto end;
266
267         result = acpi_ac_add_fs(device);
268         if (result)
269                 goto end;
270         ac->charger.name = acpi_device_bid(device);
271         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
272         ac->charger.properties = ac_props;
273         ac->charger.num_properties = ARRAY_SIZE(ac_props);
274         ac->charger.get_property = get_ac_property;
275         power_supply_register(&ac->device->dev, &ac->charger);
276         status = acpi_install_notify_handler(device->handle,
277                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
278                                              ac);
279         if (ACPI_FAILURE(status)) {
280                 result = -ENODEV;
281                 goto end;
282         }
283
284         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
285                acpi_device_name(device), acpi_device_bid(device),
286                ac->state ? "on-line" : "off-line");
287
288       end:
289         if (result) {
290                 acpi_ac_remove_fs(device);
291                 kfree(ac);
292         }
293
294         return result;
295 }
296
297 static int acpi_ac_remove(struct acpi_device *device, int type)
298 {
299         acpi_status status = AE_OK;
300         struct acpi_ac *ac = NULL;
301
302
303         if (!device || !acpi_driver_data(device))
304                 return -EINVAL;
305
306         ac = acpi_driver_data(device);
307
308         status = acpi_remove_notify_handler(device->handle,
309                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
310         if (ac->charger.dev)
311                 power_supply_unregister(&ac->charger);
312         acpi_ac_remove_fs(device);
313
314         kfree(ac);
315
316         return 0;
317 }
318
319 static int __init acpi_ac_init(void)
320 {
321         int result;
322
323         if (acpi_disabled)
324                 return -ENODEV;
325
326         acpi_ac_dir = acpi_lock_ac_dir();
327         if (!acpi_ac_dir)
328                 return -ENODEV;
329
330         result = acpi_bus_register_driver(&acpi_ac_driver);
331         if (result < 0) {
332                 acpi_unlock_ac_dir(acpi_ac_dir);
333                 return -ENODEV;
334         }
335
336         return 0;
337 }
338
339 static void __exit acpi_ac_exit(void)
340 {
341
342         acpi_bus_unregister_driver(&acpi_ac_driver);
343
344         acpi_unlock_ac_dir(acpi_ac_dir);
345
346         return;
347 }
348
349 module_init(acpi_ac_init);
350 module_exit(acpi_ac_exit);