ACPI: Remove unnecessary from/to-void* and to-void casts in drivers/acpi
[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/init.h>
29 #include <linux/types.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <acpi/acpi_bus.h>
33 #include <acpi/acpi_drivers.h>
34
35 #define ACPI_AC_COMPONENT               0x00020000
36 #define ACPI_AC_CLASS                   "ac_adapter"
37 #define ACPI_AC_HID                     "ACPI0003"
38 #define ACPI_AC_DRIVER_NAME             "ACPI AC Adapter Driver"
39 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
40 #define ACPI_AC_FILE_STATE              "state"
41 #define ACPI_AC_NOTIFY_STATUS           0x80
42 #define ACPI_AC_STATUS_OFFLINE          0x00
43 #define ACPI_AC_STATUS_ONLINE           0x01
44 #define ACPI_AC_STATUS_UNKNOWN          0xFF
45
46 #define _COMPONENT              ACPI_AC_COMPONENT
47 ACPI_MODULE_NAME("acpi_ac")
48
49     MODULE_AUTHOR("Paul Diefenbaugh");
50 MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
51 MODULE_LICENSE("GPL");
52
53 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
54 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
55
56 static int acpi_ac_add(struct acpi_device *device);
57 static int acpi_ac_remove(struct acpi_device *device, int type);
58 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
59
60 static struct acpi_driver acpi_ac_driver = {
61         .name = ACPI_AC_DRIVER_NAME,
62         .class = ACPI_AC_CLASS,
63         .ids = ACPI_AC_HID,
64         .ops = {
65                 .add = acpi_ac_add,
66                 .remove = acpi_ac_remove,
67                 },
68 };
69
70 struct acpi_ac {
71         struct acpi_device * device;
72         unsigned long state;
73 };
74
75 static const struct file_operations acpi_ac_fops = {
76         .open = acpi_ac_open_fs,
77         .read = seq_read,
78         .llseek = seq_lseek,
79         .release = single_release,
80 };
81
82 /* --------------------------------------------------------------------------
83                                AC Adapter Management
84    -------------------------------------------------------------------------- */
85
86 static int acpi_ac_get_state(struct acpi_ac *ac)
87 {
88         acpi_status status = AE_OK;
89
90
91         if (!ac)
92                 return -EINVAL;
93
94         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
95         if (ACPI_FAILURE(status)) {
96                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
97                 ac->state = ACPI_AC_STATUS_UNKNOWN;
98                 return -ENODEV;
99         }
100
101         return 0;
102 }
103
104 /* --------------------------------------------------------------------------
105                               FS Interface (/proc)
106    -------------------------------------------------------------------------- */
107
108 static struct proc_dir_entry *acpi_ac_dir;
109
110 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
111 {
112         struct acpi_ac *ac = seq->private;
113
114
115         if (!ac)
116                 return 0;
117
118         if (acpi_ac_get_state(ac)) {
119                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
120                 return 0;
121         }
122
123         seq_puts(seq, "state:                   ");
124         switch (ac->state) {
125         case ACPI_AC_STATUS_OFFLINE:
126                 seq_puts(seq, "off-line\n");
127                 break;
128         case ACPI_AC_STATUS_ONLINE:
129                 seq_puts(seq, "on-line\n");
130                 break;
131         default:
132                 seq_puts(seq, "unknown\n");
133                 break;
134         }
135
136         return 0;
137 }
138
139 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
140 {
141         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
142 }
143
144 static int acpi_ac_add_fs(struct acpi_device *device)
145 {
146         struct proc_dir_entry *entry = NULL;
147
148
149         if (!acpi_device_dir(device)) {
150                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
151                                                      acpi_ac_dir);
152                 if (!acpi_device_dir(device))
153                         return -ENODEV;
154                 acpi_device_dir(device)->owner = THIS_MODULE;
155         }
156
157         /* 'state' [R] */
158         entry = create_proc_entry(ACPI_AC_FILE_STATE,
159                                   S_IRUGO, acpi_device_dir(device));
160         if (!entry)
161                 return -ENODEV;
162         else {
163                 entry->proc_fops = &acpi_ac_fops;
164                 entry->data = acpi_driver_data(device);
165                 entry->owner = THIS_MODULE;
166         }
167
168         return 0;
169 }
170
171 static int acpi_ac_remove_fs(struct acpi_device *device)
172 {
173
174         if (acpi_device_dir(device)) {
175                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
176
177                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
178                 acpi_device_dir(device) = NULL;
179         }
180
181         return 0;
182 }
183
184 /* --------------------------------------------------------------------------
185                                    Driver Model
186    -------------------------------------------------------------------------- */
187
188 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
189 {
190         struct acpi_ac *ac = data;
191         struct acpi_device *device = NULL;
192
193
194         if (!ac)
195                 return;
196
197         device = ac->device;
198         switch (event) {
199         case ACPI_AC_NOTIFY_STATUS:
200         case ACPI_NOTIFY_BUS_CHECK:
201         case ACPI_NOTIFY_DEVICE_CHECK:
202                 acpi_ac_get_state(ac);
203                 acpi_bus_generate_event(device, event, (u32) ac->state);
204                 break;
205         default:
206                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
207                                   "Unsupported event [0x%x]\n", event));
208                 break;
209         }
210
211         return;
212 }
213
214 static int acpi_ac_add(struct acpi_device *device)
215 {
216         int result = 0;
217         acpi_status status = AE_OK;
218         struct acpi_ac *ac = NULL;
219
220
221         if (!device)
222                 return -EINVAL;
223
224         ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
225         if (!ac)
226                 return -ENOMEM;
227         memset(ac, 0, sizeof(struct acpi_ac));
228
229         ac->device = device;
230         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
231         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
232         acpi_driver_data(device) = ac;
233
234         result = acpi_ac_get_state(ac);
235         if (result)
236                 goto end;
237
238         result = acpi_ac_add_fs(device);
239         if (result)
240                 goto end;
241
242         status = acpi_install_notify_handler(device->handle,
243                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
244                                              ac);
245         if (ACPI_FAILURE(status)) {
246                 result = -ENODEV;
247                 goto end;
248         }
249
250         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
251                acpi_device_name(device), acpi_device_bid(device),
252                ac->state ? "on-line" : "off-line");
253
254       end:
255         if (result) {
256                 acpi_ac_remove_fs(device);
257                 kfree(ac);
258         }
259
260         return result;
261 }
262
263 static int acpi_ac_remove(struct acpi_device *device, int type)
264 {
265         acpi_status status = AE_OK;
266         struct acpi_ac *ac = NULL;
267
268
269         if (!device || !acpi_driver_data(device))
270                 return -EINVAL;
271
272         ac = acpi_driver_data(device);
273
274         status = acpi_remove_notify_handler(device->handle,
275                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
276
277         acpi_ac_remove_fs(device);
278
279         kfree(ac);
280
281         return 0;
282 }
283
284 static int __init acpi_ac_init(void)
285 {
286         int result;
287
288         if (acpi_disabled)
289                 return -ENODEV;
290
291         acpi_ac_dir = acpi_lock_ac_dir();
292         if (!acpi_ac_dir)
293                 return -ENODEV;
294
295         result = acpi_bus_register_driver(&acpi_ac_driver);
296         if (result < 0) {
297                 acpi_unlock_ac_dir(acpi_ac_dir);
298                 return -ENODEV;
299         }
300
301         return 0;
302 }
303
304 static void __exit acpi_ac_exit(void)
305 {
306
307         acpi_bus_unregister_driver(&acpi_ac_driver);
308
309         acpi_unlock_ac_dir(acpi_ac_dir);
310
311         return;
312 }
313
314 module_init(acpi_ac_init);
315 module_exit(acpi_ac_exit);