Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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 static void acpi_ac_notify(struct acpi_device *device, u32 event);
65
66 static const struct acpi_device_id ac_device_ids[] = {
67         {"ACPI0003", 0},
68         {"", 0},
69 };
70 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
71
72 static struct acpi_driver acpi_ac_driver = {
73         .name = "ac",
74         .class = ACPI_AC_CLASS,
75         .ids = ac_device_ids,
76         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
77         .ops = {
78                 .add = acpi_ac_add,
79                 .remove = acpi_ac_remove,
80                 .resume = acpi_ac_resume,
81                 .notify = acpi_ac_notify,
82                 },
83 };
84
85 struct acpi_ac {
86 #ifdef CONFIG_ACPI_SYSFS_POWER
87         struct power_supply charger;
88 #endif
89         struct acpi_device * device;
90         unsigned long long state;
91 };
92
93 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
94
95 #ifdef CONFIG_ACPI_PROCFS_POWER
96 static const struct file_operations acpi_ac_fops = {
97         .owner = THIS_MODULE,
98         .open = acpi_ac_open_fs,
99         .read = seq_read,
100         .llseek = seq_lseek,
101         .release = single_release,
102 };
103 #endif
104 #ifdef CONFIG_ACPI_SYSFS_POWER
105 static int get_ac_property(struct power_supply *psy,
106                            enum power_supply_property psp,
107                            union power_supply_propval *val)
108 {
109         struct acpi_ac *ac = to_acpi_ac(psy);
110         switch (psp) {
111         case POWER_SUPPLY_PROP_ONLINE:
112                 val->intval = ac->state;
113                 break;
114         default:
115                 return -EINVAL;
116         }
117         return 0;
118 }
119
120 static enum power_supply_property ac_props[] = {
121         POWER_SUPPLY_PROP_ONLINE,
122 };
123 #endif
124 /* --------------------------------------------------------------------------
125                                AC Adapter Management
126    -------------------------------------------------------------------------- */
127
128 static int acpi_ac_get_state(struct acpi_ac *ac)
129 {
130         acpi_status status = AE_OK;
131
132
133         if (!ac)
134                 return -EINVAL;
135
136         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
137         if (ACPI_FAILURE(status)) {
138                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
139                 ac->state = ACPI_AC_STATUS_UNKNOWN;
140                 return -ENODEV;
141         }
142
143         return 0;
144 }
145
146 #ifdef CONFIG_ACPI_PROCFS_POWER
147 /* --------------------------------------------------------------------------
148                               FS Interface (/proc)
149    -------------------------------------------------------------------------- */
150
151 static struct proc_dir_entry *acpi_ac_dir;
152
153 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
154 {
155         struct acpi_ac *ac = seq->private;
156
157
158         if (!ac)
159                 return 0;
160
161         if (acpi_ac_get_state(ac)) {
162                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
163                 return 0;
164         }
165
166         seq_puts(seq, "state:                   ");
167         switch (ac->state) {
168         case ACPI_AC_STATUS_OFFLINE:
169                 seq_puts(seq, "off-line\n");
170                 break;
171         case ACPI_AC_STATUS_ONLINE:
172                 seq_puts(seq, "on-line\n");
173                 break;
174         default:
175                 seq_puts(seq, "unknown\n");
176                 break;
177         }
178
179         return 0;
180 }
181
182 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
183 {
184         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
185 }
186
187 static int acpi_ac_add_fs(struct acpi_device *device)
188 {
189         struct proc_dir_entry *entry = NULL;
190
191
192         if (!acpi_device_dir(device)) {
193                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
194                                                      acpi_ac_dir);
195                 if (!acpi_device_dir(device))
196                         return -ENODEV;
197         }
198
199         /* 'state' [R] */
200         entry = proc_create_data(ACPI_AC_FILE_STATE,
201                                  S_IRUGO, acpi_device_dir(device),
202                                  &acpi_ac_fops, acpi_driver_data(device));
203         if (!entry)
204                 return -ENODEV;
205         return 0;
206 }
207
208 static int acpi_ac_remove_fs(struct acpi_device *device)
209 {
210
211         if (acpi_device_dir(device)) {
212                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
213
214                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
215                 acpi_device_dir(device) = NULL;
216         }
217
218         return 0;
219 }
220 #endif
221
222 /* --------------------------------------------------------------------------
223                                    Driver Model
224    -------------------------------------------------------------------------- */
225
226 static void acpi_ac_notify(struct acpi_device *device, u32 event)
227 {
228         struct acpi_ac *ac = acpi_driver_data(device);
229
230
231         if (!ac)
232                 return;
233
234         switch (event) {
235         default:
236                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
237                                   "Unsupported event [0x%x]\n", event));
238         case ACPI_AC_NOTIFY_STATUS:
239         case ACPI_NOTIFY_BUS_CHECK:
240         case ACPI_NOTIFY_DEVICE_CHECK:
241                 acpi_ac_get_state(ac);
242                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
243                 acpi_bus_generate_netlink_event(device->pnp.device_class,
244                                                   dev_name(&device->dev), event,
245                                                   (u32) ac->state);
246 #ifdef CONFIG_ACPI_SYSFS_POWER
247                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
248 #endif
249         }
250
251         return;
252 }
253
254 static int acpi_ac_add(struct acpi_device *device)
255 {
256         int result = 0;
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
290         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
291                acpi_device_name(device), acpi_device_bid(device),
292                ac->state ? "on-line" : "off-line");
293
294       end:
295         if (result) {
296 #ifdef CONFIG_ACPI_PROCFS_POWER
297                 acpi_ac_remove_fs(device);
298 #endif
299                 kfree(ac);
300         }
301
302         return result;
303 }
304
305 static int acpi_ac_resume(struct acpi_device *device)
306 {
307         struct acpi_ac *ac;
308         unsigned old_state;
309         if (!device || !acpi_driver_data(device))
310                 return -EINVAL;
311         ac = acpi_driver_data(device);
312         old_state = ac->state;
313         if (acpi_ac_get_state(ac))
314                 return 0;
315 #ifdef CONFIG_ACPI_SYSFS_POWER
316         if (old_state != ac->state)
317                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
318 #endif
319         return 0;
320 }
321
322 static int acpi_ac_remove(struct acpi_device *device, int type)
323 {
324         struct acpi_ac *ac = NULL;
325
326
327         if (!device || !acpi_driver_data(device))
328                 return -EINVAL;
329
330         ac = acpi_driver_data(device);
331
332 #ifdef CONFIG_ACPI_SYSFS_POWER
333         if (ac->charger.dev)
334                 power_supply_unregister(&ac->charger);
335 #endif
336 #ifdef CONFIG_ACPI_PROCFS_POWER
337         acpi_ac_remove_fs(device);
338 #endif
339
340         kfree(ac);
341
342         return 0;
343 }
344
345 static int __init acpi_ac_init(void)
346 {
347         int result;
348
349         if (acpi_disabled)
350                 return -ENODEV;
351
352 #ifdef CONFIG_ACPI_PROCFS_POWER
353         acpi_ac_dir = acpi_lock_ac_dir();
354         if (!acpi_ac_dir)
355                 return -ENODEV;
356 #endif
357
358         result = acpi_bus_register_driver(&acpi_ac_driver);
359         if (result < 0) {
360 #ifdef CONFIG_ACPI_PROCFS_POWER
361                 acpi_unlock_ac_dir(acpi_ac_dir);
362 #endif
363                 return -ENODEV;
364         }
365
366         return 0;
367 }
368
369 static void __exit acpi_ac_exit(void)
370 {
371
372         acpi_bus_unregister_driver(&acpi_ac_driver);
373
374 #ifdef CONFIG_ACPI_PROCFS_POWER
375         acpi_unlock_ac_dir(acpi_ac_dir);
376 #endif
377
378         return;
379 }
380
381 module_init(acpi_ac_init);
382 module_exit(acpi_ac_exit);