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