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
write_reg(struct i2c_client * client,int reg,int value)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
wis_uda1342_command(struct i2c_client * client,unsigned int cmd,void * arg)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
wis_uda1342_probe(struct i2c_client * client,const struct i2c_device_id * id)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
wis_uda1342_remove(struct i2c_client * client)80 static int wis_uda1342_remove(struct i2c_client *client)
81 {
82 return 0;
83 }
84
85 static const struct i2c_device_id wis_uda1342_id[] = {
86 { "wis_uda1342", 0 },
87 { }
88 };
89 MODULE_DEVICE_TABLE(i2c, wis_uda1342_id);
90
91 static struct i2c_driver wis_uda1342_driver = {
92 .driver = {
93 .name = "WIS UDA1342 I2C driver",
94 },
95 .probe = wis_uda1342_probe,
96 .remove = wis_uda1342_remove,
97 .command = wis_uda1342_command,
98 .id_table = wis_uda1342_id,
99 };
100
wis_uda1342_init(void)101 static int __init wis_uda1342_init(void)
102 {
103 return i2c_add_driver(&wis_uda1342_driver);
104 }
105
wis_uda1342_cleanup(void)106 static void __exit wis_uda1342_cleanup(void)
107 {
108 i2c_del_driver(&wis_uda1342_driver);
109 }
110
111 module_init(wis_uda1342_init);
112 module_exit(wis_uda1342_cleanup);
113
114 MODULE_LICENSE("GPL v2");
115