Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
[linux-3.10.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 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 int acpi_ac_resume(struct device *dev);
73 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
74
75 static struct acpi_driver acpi_ac_driver = {
76         .name = "ac",
77         .class = ACPI_AC_CLASS,
78         .ids = ac_device_ids,
79         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
80         .ops = {
81                 .add = acpi_ac_add,
82                 .remove = acpi_ac_remove,
83                 .notify = acpi_ac_notify,
84                 },
85         .drv.pm = &acpi_ac_pm,
86 };
87
88 struct acpi_ac {
89         struct power_supply charger;
90         struct acpi_device * device;
91         unsigned long long state;
92 };
93
94 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
95
96 #ifdef CONFIG_ACPI_PROCFS_POWER
97 static const struct file_operations acpi_ac_fops = {
98         .owner = THIS_MODULE,
99         .open = acpi_ac_open_fs,
100         .read = seq_read,
101         .llseek = seq_lseek,
102         .release = single_release,
103 };
104 #endif
105
106 /* --------------------------------------------------------------------------
107                                AC Adapter Management
108    -------------------------------------------------------------------------- */
109
110 static int acpi_ac_get_state(struct acpi_ac *ac)
111 {
112         acpi_status status = AE_OK;
113
114
115         if (!ac)
116                 return -EINVAL;
117
118         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
119         if (ACPI_FAILURE(status)) {
120                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
121                 ac->state = ACPI_AC_STATUS_UNKNOWN;
122                 return -ENODEV;
123         }
124
125         return 0;
126 }
127
128 /* --------------------------------------------------------------------------
129                             sysfs I/F
130    -------------------------------------------------------------------------- */
131 static int get_ac_property(struct power_supply *psy,
132                            enum power_supply_property psp,
133                            union power_supply_propval *val)
134 {
135         struct acpi_ac *ac = to_acpi_ac(psy);
136
137         if (!ac)
138                 return -ENODEV;
139
140         if (acpi_ac_get_state(ac))
141                 return -ENODEV;
142
143         switch (psp) {
144         case POWER_SUPPLY_PROP_ONLINE:
145                 val->intval = ac->state;
146                 break;
147         default:
148                 return -EINVAL;
149         }
150         return 0;
151 }
152
153 static enum power_supply_property ac_props[] = {
154         POWER_SUPPLY_PROP_ONLINE,
155 };
156
157 #ifdef CONFIG_ACPI_PROCFS_POWER
158 /* --------------------------------------------------------------------------
159                               FS Interface (/proc)
160    -------------------------------------------------------------------------- */
161
162 static struct proc_dir_entry *acpi_ac_dir;
163
164 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
165 {
166         struct acpi_ac *ac = seq->private;
167
168
169         if (!ac)
170                 return 0;
171
172         if (acpi_ac_get_state(ac)) {
173                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
174                 return 0;
175         }
176
177         seq_puts(seq, "state:                   ");
178         switch (ac->state) {
179         case ACPI_AC_STATUS_OFFLINE:
180                 seq_puts(seq, "off-line\n");
181                 break;
182         case ACPI_AC_STATUS_ONLINE:
183                 seq_puts(seq, "on-line\n");
184                 break;
185         default:
186                 seq_puts(seq, "unknown\n");
187                 break;
188         }
189
190         return 0;
191 }
192
193 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
194 {
195         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
196 }
197
198 static int acpi_ac_add_fs(struct acpi_device *device)
199 {
200         struct proc_dir_entry *entry = NULL;
201
202         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
203                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
204         if (!acpi_device_dir(device)) {
205                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
206                                                      acpi_ac_dir);
207                 if (!acpi_device_dir(device))
208                         return -ENODEV;
209         }
210
211         /* 'state' [R] */
212         entry = proc_create_data(ACPI_AC_FILE_STATE,
213                                  S_IRUGO, acpi_device_dir(device),
214                                  &acpi_ac_fops, acpi_driver_data(device));
215         if (!entry)
216                 return -ENODEV;
217         return 0;
218 }
219
220 static int acpi_ac_remove_fs(struct acpi_device *device)
221 {
222
223         if (acpi_device_dir(device)) {
224                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
225
226                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
227                 acpi_device_dir(device) = NULL;
228         }
229
230         return 0;
231 }
232 #endif
233
234 /* --------------------------------------------------------------------------
235                                    Driver Model
236    -------------------------------------------------------------------------- */
237
238 static void acpi_ac_notify(struct acpi_device *device, u32 event)
239 {
240         struct acpi_ac *ac = acpi_driver_data(device);
241
242
243         if (!ac)
244                 return;
245
246         switch (event) {
247         default:
248                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
249                                   "Unsupported event [0x%x]\n", event));
250         case ACPI_AC_NOTIFY_STATUS:
251         case ACPI_NOTIFY_BUS_CHECK:
252         case ACPI_NOTIFY_DEVICE_CHECK:
253                 acpi_ac_get_state(ac);
254                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
255                 acpi_bus_generate_netlink_event(device->pnp.device_class,
256                                                   dev_name(&device->dev), event,
257                                                   (u32) ac->state);
258                 acpi_notifier_call_chain(device, event, (u32) ac->state);
259                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
260         }
261
262         return;
263 }
264
265 static int acpi_ac_add(struct acpi_device *device)
266 {
267         int result = 0;
268         struct acpi_ac *ac = NULL;
269
270
271         if (!device)
272                 return -EINVAL;
273
274         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
275         if (!ac)
276                 return -ENOMEM;
277
278         ac->device = device;
279         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
280         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
281         device->driver_data = ac;
282
283         result = acpi_ac_get_state(ac);
284         if (result)
285                 goto end;
286
287 #ifdef CONFIG_ACPI_PROCFS_POWER
288         result = acpi_ac_add_fs(device);
289 #endif
290         if (result)
291                 goto end;
292         ac->charger.name = acpi_device_bid(device);
293         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
294         ac->charger.properties = ac_props;
295         ac->charger.num_properties = ARRAY_SIZE(ac_props);
296         ac->charger.get_property = get_ac_property;
297         result = power_supply_register(&ac->device->dev, &ac->charger);
298         if (result)
299                 goto end;
300
301         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
302                acpi_device_name(device), acpi_device_bid(device),
303                ac->state ? "on-line" : "off-line");
304
305       end:
306         if (result) {
307 #ifdef CONFIG_ACPI_PROCFS_POWER
308                 acpi_ac_remove_fs(device);
309 #endif
310                 kfree(ac);
311         }
312
313         return result;
314 }
315
316 static int acpi_ac_resume(struct device *dev)
317 {
318         struct acpi_ac *ac;
319         unsigned old_state;
320
321         if (!dev)
322                 return -EINVAL;
323
324         ac = acpi_driver_data(to_acpi_device(dev));
325         if (!ac)
326                 return -EINVAL;
327
328         old_state = ac->state;
329         if (acpi_ac_get_state(ac))
330                 return 0;
331         if (old_state != ac->state)
332                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
333         return 0;
334 }
335
336 static int acpi_ac_remove(struct acpi_device *device, int type)
337 {
338         struct acpi_ac *ac = NULL;
339
340
341         if (!device || !acpi_driver_data(device))
342                 return -EINVAL;
343
344         ac = acpi_driver_data(device);
345
346         if (ac->charger.dev)
347                 power_supply_unregister(&ac->charger);
348 #ifdef CONFIG_ACPI_PROCFS_POWER
349         acpi_ac_remove_fs(device);
350 #endif
351
352         kfree(ac);
353
354         return 0;
355 }
356
357 static int __init acpi_ac_init(void)
358 {
359         int result;
360
361         if (acpi_disabled)
362                 return -ENODEV;
363
364 #ifdef CONFIG_ACPI_PROCFS_POWER
365         acpi_ac_dir = acpi_lock_ac_dir();
366         if (!acpi_ac_dir)
367                 return -ENODEV;
368 #endif
369
370         result = acpi_bus_register_driver(&acpi_ac_driver);
371         if (result < 0) {
372 #ifdef CONFIG_ACPI_PROCFS_POWER
373                 acpi_unlock_ac_dir(acpi_ac_dir);
374 #endif
375                 return -ENODEV;
376         }
377
378         return 0;
379 }
380
381 static void __exit acpi_ac_exit(void)
382 {
383
384         acpi_bus_unregister_driver(&acpi_ac_driver);
385
386 #ifdef CONFIG_ACPI_PROCFS_POWER
387         acpi_unlock_ac_dir(acpi_ac_dir);
388 #endif
389
390         return;
391 }
392
393 module_init(acpi_ac_init);
394 module_exit(acpi_ac_exit);