Merge branch 'acpi-lpss'
[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 #ifdef CONFIG_PM_SLEEP
73 static int acpi_ac_resume(struct device *dev);
74 #endif
75 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
76
77 static struct acpi_driver acpi_ac_driver = {
78         .name = "ac",
79         .class = ACPI_AC_CLASS,
80         .ids = ac_device_ids,
81         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
82         .ops = {
83                 .add = acpi_ac_add,
84                 .remove = acpi_ac_remove,
85                 .notify = acpi_ac_notify,
86                 },
87         .drv.pm = &acpi_ac_pm,
88 };
89
90 struct acpi_ac {
91         struct power_supply charger;
92         struct acpi_device * device;
93         unsigned long long state;
94 };
95
96 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
97
98 #ifdef CONFIG_ACPI_PROCFS_POWER
99 static const struct file_operations acpi_ac_fops = {
100         .owner = THIS_MODULE,
101         .open = acpi_ac_open_fs,
102         .read = seq_read,
103         .llseek = seq_lseek,
104         .release = single_release,
105 };
106 #endif
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                             sysfs I/F
132    -------------------------------------------------------------------------- */
133 static int get_ac_property(struct power_supply *psy,
134                            enum power_supply_property psp,
135                            union power_supply_propval *val)
136 {
137         struct acpi_ac *ac = to_acpi_ac(psy);
138
139         if (!ac)
140                 return -ENODEV;
141
142         if (acpi_ac_get_state(ac))
143                 return -ENODEV;
144
145         switch (psp) {
146         case POWER_SUPPLY_PROP_ONLINE:
147                 val->intval = ac->state;
148                 break;
149         default:
150                 return -EINVAL;
151         }
152         return 0;
153 }
154
155 static enum power_supply_property ac_props[] = {
156         POWER_SUPPLY_PROP_ONLINE,
157 };
158
159 #ifdef CONFIG_ACPI_PROCFS_POWER
160 /* --------------------------------------------------------------------------
161                               FS Interface (/proc)
162    -------------------------------------------------------------------------- */
163
164 static struct proc_dir_entry *acpi_ac_dir;
165
166 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
167 {
168         struct acpi_ac *ac = seq->private;
169
170
171         if (!ac)
172                 return 0;
173
174         if (acpi_ac_get_state(ac)) {
175                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
176                 return 0;
177         }
178
179         seq_puts(seq, "state:                   ");
180         switch (ac->state) {
181         case ACPI_AC_STATUS_OFFLINE:
182                 seq_puts(seq, "off-line\n");
183                 break;
184         case ACPI_AC_STATUS_ONLINE:
185                 seq_puts(seq, "on-line\n");
186                 break;
187         default:
188                 seq_puts(seq, "unknown\n");
189                 break;
190         }
191
192         return 0;
193 }
194
195 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
196 {
197         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
198 }
199
200 static int acpi_ac_add_fs(struct acpi_device *device)
201 {
202         struct proc_dir_entry *entry = NULL;
203
204         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
205                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
206         if (!acpi_device_dir(device)) {
207                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
208                                                      acpi_ac_dir);
209                 if (!acpi_device_dir(device))
210                         return -ENODEV;
211         }
212
213         /* 'state' [R] */
214         entry = proc_create_data(ACPI_AC_FILE_STATE,
215                                  S_IRUGO, acpi_device_dir(device),
216                                  &acpi_ac_fops, acpi_driver_data(device));
217         if (!entry)
218                 return -ENODEV;
219         return 0;
220 }
221
222 static int acpi_ac_remove_fs(struct acpi_device *device)
223 {
224
225         if (acpi_device_dir(device)) {
226                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
227
228                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
229                 acpi_device_dir(device) = NULL;
230         }
231
232         return 0;
233 }
234 #endif
235
236 /* --------------------------------------------------------------------------
237                                    Driver Model
238    -------------------------------------------------------------------------- */
239
240 static void acpi_ac_notify(struct acpi_device *device, u32 event)
241 {
242         struct acpi_ac *ac = acpi_driver_data(device);
243
244
245         if (!ac)
246                 return;
247
248         switch (event) {
249         default:
250                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251                                   "Unsupported event [0x%x]\n", event));
252         case ACPI_AC_NOTIFY_STATUS:
253         case ACPI_NOTIFY_BUS_CHECK:
254         case ACPI_NOTIFY_DEVICE_CHECK:
255                 acpi_ac_get_state(ac);
256                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
257                 acpi_bus_generate_netlink_event(device->pnp.device_class,
258                                                   dev_name(&device->dev), event,
259                                                   (u32) ac->state);
260                 acpi_notifier_call_chain(device, event, (u32) ac->state);
261                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
262         }
263
264         return;
265 }
266
267 static int acpi_ac_add(struct acpi_device *device)
268 {
269         int result = 0;
270         struct acpi_ac *ac = NULL;
271
272
273         if (!device)
274                 return -EINVAL;
275
276         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
277         if (!ac)
278                 return -ENOMEM;
279
280         ac->device = device;
281         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
282         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
283         device->driver_data = ac;
284
285         result = acpi_ac_get_state(ac);
286         if (result)
287                 goto end;
288
289 #ifdef CONFIG_ACPI_PROCFS_POWER
290         result = acpi_ac_add_fs(device);
291 #endif
292         if (result)
293                 goto end;
294         ac->charger.name = acpi_device_bid(device);
295         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
296         ac->charger.properties = ac_props;
297         ac->charger.num_properties = ARRAY_SIZE(ac_props);
298         ac->charger.get_property = get_ac_property;
299         result = power_supply_register(&ac->device->dev, &ac->charger);
300         if (result)
301                 goto end;
302
303         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
304                acpi_device_name(device), acpi_device_bid(device),
305                ac->state ? "on-line" : "off-line");
306
307       end:
308         if (result) {
309 #ifdef CONFIG_ACPI_PROCFS_POWER
310                 acpi_ac_remove_fs(device);
311 #endif
312                 kfree(ac);
313         }
314
315         return result;
316 }
317
318 #ifdef CONFIG_PM_SLEEP
319 static int acpi_ac_resume(struct device *dev)
320 {
321         struct acpi_ac *ac;
322         unsigned old_state;
323
324         if (!dev)
325                 return -EINVAL;
326
327         ac = acpi_driver_data(to_acpi_device(dev));
328         if (!ac)
329                 return -EINVAL;
330
331         old_state = ac->state;
332         if (acpi_ac_get_state(ac))
333                 return 0;
334         if (old_state != ac->state)
335                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
336         return 0;
337 }
338 #endif
339
340 static int acpi_ac_remove(struct acpi_device *device, int type)
341 {
342         struct acpi_ac *ac = NULL;
343
344
345         if (!device || !acpi_driver_data(device))
346                 return -EINVAL;
347
348         ac = acpi_driver_data(device);
349
350         if (ac->charger.dev)
351                 power_supply_unregister(&ac->charger);
352 #ifdef CONFIG_ACPI_PROCFS_POWER
353         acpi_ac_remove_fs(device);
354 #endif
355
356         kfree(ac);
357
358         return 0;
359 }
360
361 static int __init acpi_ac_init(void)
362 {
363         int result;
364
365         if (acpi_disabled)
366                 return -ENODEV;
367
368 #ifdef CONFIG_ACPI_PROCFS_POWER
369         acpi_ac_dir = acpi_lock_ac_dir();
370         if (!acpi_ac_dir)
371                 return -ENODEV;
372 #endif
373
374         result = acpi_bus_register_driver(&acpi_ac_driver);
375         if (result < 0) {
376 #ifdef CONFIG_ACPI_PROCFS_POWER
377                 acpi_unlock_ac_dir(acpi_ac_dir);
378 #endif
379                 return -ENODEV;
380         }
381
382         return 0;
383 }
384
385 static void __exit acpi_ac_exit(void)
386 {
387
388         acpi_bus_unregister_driver(&acpi_ac_driver);
389
390 #ifdef CONFIG_ACPI_PROCFS_POWER
391         acpi_unlock_ac_dir(acpi_ac_dir);
392 #endif
393
394         return;
395 }
396
397 module_init(acpi_ac_init);
398 module_exit(acpi_ac_exit);