Merge branch 'core/debugobjects' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 #ifdef CONFIG_ACPI_PROCFS_POWER
31 #include <linux/proc_fs.h>
32 #include <linux/seq_file.h>
33 #endif
34 #ifdef CONFIG_ACPI_SYSFS_POWER
35 #include <linux/power_supply.h>
36 #endif
37 #include <acpi/acpi_bus.h>
38 #include <acpi/acpi_drivers.h>
39
40 #define ACPI_AC_CLASS                   "ac_adapter"
41 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
42 #define ACPI_AC_FILE_STATE              "state"
43 #define ACPI_AC_NOTIFY_STATUS           0x80
44 #define ACPI_AC_STATUS_OFFLINE          0x00
45 #define ACPI_AC_STATUS_ONLINE           0x01
46 #define ACPI_AC_STATUS_UNKNOWN          0xFF
47
48 #define _COMPONENT              ACPI_AC_COMPONENT
49 ACPI_MODULE_NAME("ac");
50
51 MODULE_AUTHOR("Paul Diefenbaugh");
52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53 MODULE_LICENSE("GPL");
54
55 #ifdef CONFIG_ACPI_PROCFS_POWER
56 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
57 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
58 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
59 #endif
60
61 static int acpi_ac_add(struct acpi_device *device);
62 static int acpi_ac_remove(struct acpi_device *device, int type);
63 static int acpi_ac_resume(struct acpi_device *device);
64
65 static const struct acpi_device_id ac_device_ids[] = {
66         {"ACPI0003", 0},
67         {"", 0},
68 };
69 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
70
71 static struct acpi_driver acpi_ac_driver = {
72         .name = "ac",
73         .class = ACPI_AC_CLASS,
74         .ids = ac_device_ids,
75         .ops = {
76                 .add = acpi_ac_add,
77                 .remove = acpi_ac_remove,
78                 .resume = acpi_ac_resume,
79                 },
80 };
81
82 struct acpi_ac {
83 #ifdef CONFIG_ACPI_SYSFS_POWER
84         struct power_supply charger;
85 #endif
86         struct acpi_device * device;
87         unsigned long long state;
88 };
89
90 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
91
92 #ifdef CONFIG_ACPI_PROCFS_POWER
93 static const struct file_operations acpi_ac_fops = {
94         .owner = THIS_MODULE,
95         .open = acpi_ac_open_fs,
96         .read = seq_read,
97         .llseek = seq_lseek,
98         .release = single_release,
99 };
100 #endif
101 #ifdef CONFIG_ACPI_SYSFS_POWER
102 static int get_ac_property(struct power_supply *psy,
103                            enum power_supply_property psp,
104                            union power_supply_propval *val)
105 {
106         struct acpi_ac *ac = to_acpi_ac(psy);
107         switch (psp) {
108         case POWER_SUPPLY_PROP_ONLINE:
109                 val->intval = ac->state;
110                 break;
111         default:
112                 return -EINVAL;
113         }
114         return 0;
115 }
116
117 static enum power_supply_property ac_props[] = {
118         POWER_SUPPLY_PROP_ONLINE,
119 };
120 #endif
121 /* --------------------------------------------------------------------------
122                                AC Adapter Management
123    -------------------------------------------------------------------------- */
124
125 static int acpi_ac_get_state(struct acpi_ac *ac)
126 {
127         acpi_status status = AE_OK;
128
129
130         if (!ac)
131                 return -EINVAL;
132
133         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
134         if (ACPI_FAILURE(status)) {
135                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
136                 ac->state = ACPI_AC_STATUS_UNKNOWN;
137                 return -ENODEV;
138         }
139
140         return 0;
141 }
142
143 #ifdef CONFIG_ACPI_PROCFS_POWER
144 /* --------------------------------------------------------------------------
145                               FS Interface (/proc)
146    -------------------------------------------------------------------------- */
147
148 static struct proc_dir_entry *acpi_ac_dir;
149
150 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
151 {
152         struct acpi_ac *ac = seq->private;
153
154
155         if (!ac)
156                 return 0;
157
158         if (acpi_ac_get_state(ac)) {
159                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
160                 return 0;
161         }
162
163         seq_puts(seq, "state:                   ");
164         switch (ac->state) {
165         case ACPI_AC_STATUS_OFFLINE:
166                 seq_puts(seq, "off-line\n");
167                 break;
168         case ACPI_AC_STATUS_ONLINE:
169                 seq_puts(seq, "on-line\n");
170                 break;
171         default:
172                 seq_puts(seq, "unknown\n");
173                 break;
174         }
175
176         return 0;
177 }
178
179 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
180 {
181         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
182 }
183
184 static int acpi_ac_add_fs(struct acpi_device *device)
185 {
186         struct proc_dir_entry *entry = NULL;
187
188
189         if (!acpi_device_dir(device)) {
190                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
191                                                      acpi_ac_dir);
192                 if (!acpi_device_dir(device))
193                         return -ENODEV;
194         }
195
196         /* 'state' [R] */
197         entry = proc_create_data(ACPI_AC_FILE_STATE,
198                                  S_IRUGO, acpi_device_dir(device),
199                                  &acpi_ac_fops, acpi_driver_data(device));
200         if (!entry)
201                 return -ENODEV;
202         return 0;
203 }
204
205 static int acpi_ac_remove_fs(struct acpi_device *device)
206 {
207
208         if (acpi_device_dir(device)) {
209                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
210
211                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
212                 acpi_device_dir(device) = NULL;
213         }
214
215         return 0;
216 }
217 #endif
218
219 /* --------------------------------------------------------------------------
220                                    Driver Model
221    -------------------------------------------------------------------------- */
222
223 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
224 {
225         struct acpi_ac *ac = data;
226         struct acpi_device *device = NULL;
227
228
229         if (!ac)
230                 return;
231
232         device = ac->device;
233         switch (event) {
234         default:
235                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
236                                   "Unsupported event [0x%x]\n", event));
237         case ACPI_AC_NOTIFY_STATUS:
238         case ACPI_NOTIFY_BUS_CHECK:
239         case ACPI_NOTIFY_DEVICE_CHECK:
240                 acpi_ac_get_state(ac);
241                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
242                 acpi_bus_generate_netlink_event(device->pnp.device_class,
243                                                   dev_name(&device->dev), event,
244                                                   (u32) ac->state);
245 #ifdef CONFIG_ACPI_SYSFS_POWER
246                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
247 #endif
248         }
249
250         return;
251 }
252
253 static int acpi_ac_add(struct acpi_device *device)
254 {
255         int result = 0;
256         acpi_status status = AE_OK;
257         struct acpi_ac *ac = NULL;
258
259
260         if (!device)
261                 return -EINVAL;
262
263         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
264         if (!ac)
265                 return -ENOMEM;
266
267         ac->device = device;
268         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
269         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
270         device->driver_data = ac;
271
272         result = acpi_ac_get_state(ac);
273         if (result)
274                 goto end;
275
276 #ifdef CONFIG_ACPI_PROCFS_POWER
277         result = acpi_ac_add_fs(device);
278 #endif
279         if (result)
280                 goto end;
281 #ifdef CONFIG_ACPI_SYSFS_POWER
282         ac->charger.name = acpi_device_bid(device);
283         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
284         ac->charger.properties = ac_props;
285         ac->charger.num_properties = ARRAY_SIZE(ac_props);
286         ac->charger.get_property = get_ac_property;
287         power_supply_register(&ac->device->dev, &ac->charger);
288 #endif
289         status = acpi_install_notify_handler(device->handle,
290                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
291                                              ac);
292         if (ACPI_FAILURE(status)) {
293                 result = -ENODEV;
294                 goto end;
295         }
296
297         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
298                acpi_device_name(device), acpi_device_bid(device),
299                ac->state ? "on-line" : "off-line");
300
301       end:
302         if (result) {
303 #ifdef CONFIG_ACPI_PROCFS_POWER
304                 acpi_ac_remove_fs(device);
305 #endif
306                 kfree(ac);
307         }
308
309         return result;
310 }
311
312 static int acpi_ac_resume(struct acpi_device *device)
313 {
314         struct acpi_ac *ac;
315         unsigned old_state;
316         if (!device || !acpi_driver_data(device))
317                 return -EINVAL;
318         ac = acpi_driver_data(device);
319         old_state = ac->state;
320         if (acpi_ac_get_state(ac))
321                 return 0;
322 #ifdef CONFIG_ACPI_SYSFS_POWER
323         if (old_state != ac->state)
324                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
325 #endif
326         return 0;
327 }
328
329 static int acpi_ac_remove(struct acpi_device *device, int type)
330 {
331         acpi_status status = AE_OK;
332         struct acpi_ac *ac = NULL;
333
334
335         if (!device || !acpi_driver_data(device))
336                 return -EINVAL;
337
338         ac = acpi_driver_data(device);
339
340         status = acpi_remove_notify_handler(device->handle,
341                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
342 #ifdef CONFIG_ACPI_SYSFS_POWER
343         if (ac->charger.dev)
344                 power_supply_unregister(&ac->charger);
345 #endif
346 #ifdef CONFIG_ACPI_PROCFS_POWER
347         acpi_ac_remove_fs(device);
348 #endif
349
350         kfree(ac);
351
352         return 0;
353 }
354
355 static int __init acpi_ac_init(void)
356 {
357         int result;
358
359         if (acpi_disabled)
360                 return -ENODEV;
361
362 #ifdef CONFIG_ACPI_PROCFS_POWER
363         acpi_ac_dir = acpi_lock_ac_dir();
364         if (!acpi_ac_dir)
365                 return -ENODEV;
366 #endif
367
368         result = acpi_bus_register_driver(&acpi_ac_driver);
369         if (result < 0) {
370 #ifdef CONFIG_ACPI_PROCFS_POWER
371                 acpi_unlock_ac_dir(acpi_ac_dir);
372 #endif
373                 return -ENODEV;
374         }
375
376         return 0;
377 }
378
379 static void __exit acpi_ac_exit(void)
380 {
381
382         acpi_bus_unregister_driver(&acpi_ac_driver);
383
384 #ifdef CONFIG_ACPI_PROCFS_POWER
385         acpi_unlock_ac_dir(acpi_ac_dir);
386 #endif
387
388         return;
389 }
390
391 module_init(acpi_ac_init);
392 module_exit(acpi_ac_exit);