ACPI: catch calls of acpi_driver_data on pointer of wrong type
[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/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         .owner = THIS_MODULE,
96         .open = acpi_ac_open_fs,
97         .read = seq_read,
98         .llseek = seq_lseek,
99         .release = single_release,
100 };
101 #endif
102 #ifdef CONFIG_ACPI_SYSFS_POWER
103 static int get_ac_property(struct power_supply *psy,
104                            enum power_supply_property psp,
105                            union power_supply_propval *val)
106 {
107         struct acpi_ac *ac = to_acpi_ac(psy);
108         switch (psp) {
109         case POWER_SUPPLY_PROP_ONLINE:
110                 val->intval = ac->state;
111                 break;
112         default:
113                 return -EINVAL;
114         }
115         return 0;
116 }
117
118 static enum power_supply_property ac_props[] = {
119         POWER_SUPPLY_PROP_ONLINE,
120 };
121 #endif
122 /* --------------------------------------------------------------------------
123                                AC Adapter Management
124    -------------------------------------------------------------------------- */
125
126 static int acpi_ac_get_state(struct acpi_ac *ac)
127 {
128         acpi_status status = AE_OK;
129
130
131         if (!ac)
132                 return -EINVAL;
133
134         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
135         if (ACPI_FAILURE(status)) {
136                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
137                 ac->state = ACPI_AC_STATUS_UNKNOWN;
138                 return -ENODEV;
139         }
140
141         return 0;
142 }
143
144 #ifdef CONFIG_ACPI_PROCFS_POWER
145 /* --------------------------------------------------------------------------
146                               FS Interface (/proc)
147    -------------------------------------------------------------------------- */
148
149 static struct proc_dir_entry *acpi_ac_dir;
150
151 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
152 {
153         struct acpi_ac *ac = seq->private;
154
155
156         if (!ac)
157                 return 0;
158
159         if (acpi_ac_get_state(ac)) {
160                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
161                 return 0;
162         }
163
164         seq_puts(seq, "state:                   ");
165         switch (ac->state) {
166         case ACPI_AC_STATUS_OFFLINE:
167                 seq_puts(seq, "off-line\n");
168                 break;
169         case ACPI_AC_STATUS_ONLINE:
170                 seq_puts(seq, "on-line\n");
171                 break;
172         default:
173                 seq_puts(seq, "unknown\n");
174                 break;
175         }
176
177         return 0;
178 }
179
180 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
181 {
182         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
183 }
184
185 static int acpi_ac_add_fs(struct acpi_device *device)
186 {
187         struct proc_dir_entry *entry = NULL;
188
189
190         if (!acpi_device_dir(device)) {
191                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
192                                                      acpi_ac_dir);
193                 if (!acpi_device_dir(device))
194                         return -ENODEV;
195                 acpi_device_dir(device)->owner = THIS_MODULE;
196         }
197
198         /* 'state' [R] */
199         entry = proc_create_data(ACPI_AC_FILE_STATE,
200                                  S_IRUGO, acpi_device_dir(device),
201                                  &acpi_ac_fops, acpi_driver_data(device));
202         if (!entry)
203                 return -ENODEV;
204         return 0;
205 }
206
207 static int acpi_ac_remove_fs(struct acpi_device *device)
208 {
209
210         if (acpi_device_dir(device)) {
211                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
212
213                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
214                 acpi_device_dir(device) = NULL;
215         }
216
217         return 0;
218 }
219 #endif
220
221 /* --------------------------------------------------------------------------
222                                    Driver Model
223    -------------------------------------------------------------------------- */
224
225 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
226 {
227         struct acpi_ac *ac = data;
228         struct acpi_device *device = NULL;
229
230
231         if (!ac)
232                 return;
233
234         device = ac->device;
235         switch (event) {
236         default:
237                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
238                                   "Unsupported event [0x%x]\n", event));
239         case ACPI_AC_NOTIFY_STATUS:
240         case ACPI_NOTIFY_BUS_CHECK:
241         case ACPI_NOTIFY_DEVICE_CHECK:
242                 acpi_ac_get_state(ac);
243                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
244                 acpi_bus_generate_netlink_event(device->pnp.device_class,
245                                                   device->dev.bus_id, event,
246                                                   (u32) ac->state);
247 #ifdef CONFIG_ACPI_SYSFS_POWER
248                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
249 #endif
250         }
251
252         return;
253 }
254
255 static int acpi_ac_add(struct acpi_device *device)
256 {
257         int result = 0;
258         acpi_status status = AE_OK;
259         struct acpi_ac *ac = NULL;
260
261
262         if (!device)
263                 return -EINVAL;
264
265         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
266         if (!ac)
267                 return -ENOMEM;
268
269         ac->device = device;
270         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
271         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
272         device->driver_data = ac;
273
274         result = acpi_ac_get_state(ac);
275         if (result)
276                 goto end;
277
278 #ifdef CONFIG_ACPI_PROCFS_POWER
279         result = acpi_ac_add_fs(device);
280 #endif
281         if (result)
282                 goto end;
283 #ifdef CONFIG_ACPI_SYSFS_POWER
284         ac->charger.name = acpi_device_bid(device);
285         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
286         ac->charger.properties = ac_props;
287         ac->charger.num_properties = ARRAY_SIZE(ac_props);
288         ac->charger.get_property = get_ac_property;
289         power_supply_register(&ac->device->dev, &ac->charger);
290 #endif
291         status = acpi_install_notify_handler(device->handle,
292                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
293                                              ac);
294         if (ACPI_FAILURE(status)) {
295                 result = -ENODEV;
296                 goto end;
297         }
298
299         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
300                acpi_device_name(device), acpi_device_bid(device),
301                ac->state ? "on-line" : "off-line");
302
303       end:
304         if (result) {
305 #ifdef CONFIG_ACPI_PROCFS_POWER
306                 acpi_ac_remove_fs(device);
307 #endif
308                 kfree(ac);
309         }
310
311         return result;
312 }
313
314 static int acpi_ac_resume(struct acpi_device *device)
315 {
316         struct acpi_ac *ac;
317         unsigned old_state;
318         if (!device || !acpi_driver_data(device))
319                 return -EINVAL;
320         ac = acpi_driver_data(device);
321         old_state = ac->state;
322         if (acpi_ac_get_state(ac))
323                 return 0;
324 #ifdef CONFIG_ACPI_SYSFS_POWER
325         if (old_state != ac->state)
326                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
327 #endif
328         return 0;
329 }
330
331 static int acpi_ac_remove(struct acpi_device *device, int type)
332 {
333         acpi_status status = AE_OK;
334         struct acpi_ac *ac = NULL;
335
336
337         if (!device || !acpi_driver_data(device))
338                 return -EINVAL;
339
340         ac = acpi_driver_data(device);
341
342         status = acpi_remove_notify_handler(device->handle,
343                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
344 #ifdef CONFIG_ACPI_SYSFS_POWER
345         if (ac->charger.dev)
346                 power_supply_unregister(&ac->charger);
347 #endif
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);