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[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_COMPONENT               0x00020000
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
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         .ops = {
77                 .add = acpi_ac_add,
78                 .remove = acpi_ac_remove,
79                 .resume = acpi_ac_resume,
80                 },
81 };
82
83 struct acpi_ac {
84 #ifdef CONFIG_ACPI_SYSFS_POWER
85         struct power_supply charger;
86 #endif
87         struct acpi_device * device;
88         unsigned long state;
89 };
90
91 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
92
93 #ifdef CONFIG_ACPI_PROCFS_POWER
94 static const struct file_operations acpi_ac_fops = {
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                 acpi_device_dir(device)->owner = THIS_MODULE;
195         }
196
197         /* 'state' [R] */
198         entry = create_proc_entry(ACPI_AC_FILE_STATE,
199                                   S_IRUGO, acpi_device_dir(device));
200         if (!entry)
201                 return -ENODEV;
202         else {
203                 entry->proc_fops = &acpi_ac_fops;
204                 entry->data = acpi_driver_data(device);
205                 entry->owner = THIS_MODULE;
206         }
207
208         return 0;
209 }
210
211 static int acpi_ac_remove_fs(struct acpi_device *device)
212 {
213
214         if (acpi_device_dir(device)) {
215                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
216
217                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
218                 acpi_device_dir(device) = NULL;
219         }
220
221         return 0;
222 }
223 #endif
224
225 /* --------------------------------------------------------------------------
226                                    Driver Model
227    -------------------------------------------------------------------------- */
228
229 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
230 {
231         struct acpi_ac *ac = data;
232         struct acpi_device *device = NULL;
233
234
235         if (!ac)
236                 return;
237
238         device = ac->device;
239         switch (event) {
240         case ACPI_AC_NOTIFY_STATUS:
241         case ACPI_NOTIFY_BUS_CHECK:
242         case ACPI_NOTIFY_DEVICE_CHECK:
243                 acpi_ac_get_state(ac);
244                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
245                 acpi_bus_generate_netlink_event(device->pnp.device_class,
246                                                   device->dev.bus_id, event,
247                                                   (u32) ac->state);
248 #ifdef CONFIG_ACPI_SYSFS_POWER
249                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
250 #endif
251                 break;
252         default:
253                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
254                                   "Unsupported event [0x%x]\n", event));
255                 break;
256         }
257
258         return;
259 }
260
261 static int acpi_ac_add(struct acpi_device *device)
262 {
263         int result = 0;
264         acpi_status status = AE_OK;
265         struct acpi_ac *ac = NULL;
266
267
268         if (!device)
269                 return -EINVAL;
270
271         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
272         if (!ac)
273                 return -ENOMEM;
274
275         ac->device = device;
276         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
277         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
278         acpi_driver_data(device) = ac;
279
280         result = acpi_ac_get_state(ac);
281         if (result)
282                 goto end;
283
284 #ifdef CONFIG_ACPI_PROCFS_POWER
285         result = acpi_ac_add_fs(device);
286 #endif
287         if (result)
288                 goto end;
289 #ifdef CONFIG_ACPI_SYSFS_POWER
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 #endif
297         status = acpi_install_notify_handler(device->handle,
298                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
299                                              ac);
300         if (ACPI_FAILURE(status)) {
301                 result = -ENODEV;
302                 goto end;
303         }
304
305         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
306                acpi_device_name(device), acpi_device_bid(device),
307                ac->state ? "on-line" : "off-line");
308
309       end:
310         if (result) {
311 #ifdef CONFIG_ACPI_PROCFS_POWER
312                 acpi_ac_remove_fs(device);
313 #endif
314                 kfree(ac);
315         }
316
317         return result;
318 }
319
320 static int acpi_ac_resume(struct acpi_device *device)
321 {
322         struct acpi_ac *ac;
323         unsigned old_state;
324         if (!device || !acpi_driver_data(device))
325                 return -EINVAL;
326         ac = acpi_driver_data(device);
327         old_state = ac->state;
328         if (acpi_ac_get_state(ac))
329                 return 0;
330 #ifdef CONFIG_ACPI_SYSFS_POWER
331         if (old_state != ac->state)
332                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
333 #endif
334         return 0;
335 }
336
337 static int acpi_ac_remove(struct acpi_device *device, int type)
338 {
339         acpi_status status = AE_OK;
340         struct acpi_ac *ac = NULL;
341
342
343         if (!device || !acpi_driver_data(device))
344                 return -EINVAL;
345
346         ac = acpi_driver_data(device);
347
348         status = acpi_remove_notify_handler(device->handle,
349                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
350 #ifdef CONFIG_ACPI_SYSFS_POWER
351         if (ac->charger.dev)
352                 power_supply_unregister(&ac->charger);
353 #endif
354 #ifdef CONFIG_ACPI_PROCFS_POWER
355         acpi_ac_remove_fs(device);
356 #endif
357
358         kfree(ac);
359
360         return 0;
361 }
362
363 static int __init acpi_ac_init(void)
364 {
365         int result;
366
367         if (acpi_disabled)
368                 return -ENODEV;
369
370 #ifdef CONFIG_ACPI_PROCFS_POWER
371         acpi_ac_dir = acpi_lock_ac_dir();
372         if (!acpi_ac_dir)
373                 return -ENODEV;
374 #endif
375
376         result = acpi_bus_register_driver(&acpi_ac_driver);
377         if (result < 0) {
378 #ifdef CONFIG_ACPI_PROCFS_POWER
379                 acpi_unlock_ac_dir(acpi_ac_dir);
380 #endif
381                 return -ENODEV;
382         }
383
384         return 0;
385 }
386
387 static void __exit acpi_ac_exit(void)
388 {
389
390         acpi_bus_unregister_driver(&acpi_ac_driver);
391
392 #ifdef CONFIG_ACPI_PROCFS_POWER
393         acpi_unlock_ac_dir(acpi_ac_dir);
394 #endif
395
396         return;
397 }
398
399 module_init(acpi_ac_init);
400 module_exit(acpi_ac_exit);