Merge branch 'fix/caiaq' into for-linus
[linux-2.6] / drivers / staging / go7007 / wis-uda1342.c
1 /*
2  * Copyright (C) 2005-2006 Micronas USA Inc.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License (Version 2) as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software Foundation,
15  * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
16  */
17
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/i2c.h>
21 #include <linux/videodev2.h>
22 #include <media/tvaudio.h>
23 #include <media/v4l2-common.h>
24
25 #include "wis-i2c.h"
26
27 static int write_reg(struct i2c_client *client, int reg, int value)
28 {
29         /* UDA1342 wants MSB first, but SMBus sends LSB first */
30         i2c_smbus_write_word_data(client, reg, swab16(value));
31         return 0;
32 }
33
34 static int wis_uda1342_command(struct i2c_client *client,
35                                 unsigned int cmd, void *arg)
36 {
37         switch (cmd) {
38         case VIDIOC_S_AUDIO:
39         {
40                 int *inp = arg;
41
42                 switch (*inp) {
43                 case TVAUDIO_INPUT_TUNER:
44                         write_reg(client, 0x00, 0x1441); /* select input 2 */
45                         break;
46                 case TVAUDIO_INPUT_EXTERN:
47                         write_reg(client, 0x00, 0x1241); /* select input 1 */
48                         break;
49                 default:
50                         printk(KERN_ERR "wis-uda1342: input %d not supported\n",
51                                         *inp);
52                         break;
53                 }
54                 break;
55         }
56         default:
57                 break;
58         }
59         return 0;
60 }
61
62 static int wis_uda1342_probe(struct i2c_client *client,
63                              const struct i2c_device_id *id)
64 {
65         struct i2c_adapter *adapter = client->adapter;
66
67         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
68                 return -ENODEV;
69
70         printk(KERN_DEBUG
71                 "wis-uda1342: initializing UDA1342 at address %d on %s\n",
72                 client->addr, adapter->name);
73
74         write_reg(client, 0x00, 0x8000); /* reset registers */
75         write_reg(client, 0x00, 0x1241); /* select input 1 */
76
77         return 0;
78 }
79
80 static int wis_uda1342_remove(struct i2c_client *client)
81 {
82         return 0;
83 }
84
85 static struct i2c_device_id wis_uda1342_id[] = {
86         { "wis_uda1342", 0 },
87         { }
88 };
89
90 static struct i2c_driver wis_uda1342_driver = {
91         .driver = {
92                 .name   = "WIS UDA1342 I2C driver",
93         },
94         .probe          = wis_uda1342_probe,
95         .remove         = wis_uda1342_remove,
96         .command        = wis_uda1342_command,
97         .id_table       = wis_uda1342_id,
98 };
99
100 static int __init wis_uda1342_init(void)
101 {
102         return i2c_add_driver(&wis_uda1342_driver);
103 }
104
105 static void __exit wis_uda1342_cleanup(void)
106 {
107         i2c_del_driver(&wis_uda1342_driver);
108 }
109
110 module_init(wis_uda1342_init);
111 module_exit(wis_uda1342_cleanup);
112
113 MODULE_LICENSE("GPL v2");