Merge branch 'for-2.6.28' of git://linux-nfs.org/~bfields/linux
[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 struct i2c_driver wis_uda1342_driver;
63
64 static struct i2c_client wis_uda1342_client_templ = {
65         .name           = "UDA1342 (WIS)",
66         .driver         = &wis_uda1342_driver,
67 };
68
69 static int wis_uda1342_detect(struct i2c_adapter *adapter, int addr, int kind)
70 {
71         struct i2c_client *client;
72
73         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
74                 return 0;
75
76         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
77         if (client == NULL)
78                 return -ENOMEM;
79         memcpy(client, &wis_uda1342_client_templ,
80                         sizeof(wis_uda1342_client_templ));
81         client->adapter = adapter;
82         client->addr = addr;
83
84         printk(KERN_DEBUG
85                 "wis-uda1342: initializing UDA1342 at address %d on %s\n",
86                 addr, adapter->name);
87
88         write_reg(client, 0x00, 0x8000); /* reset registers */
89         write_reg(client, 0x00, 0x1241); /* select input 1 */
90
91         i2c_attach_client(client);
92         return 0;
93 }
94
95 static int wis_uda1342_detach(struct i2c_client *client)
96 {
97         int r;
98
99         r = i2c_detach_client(client);
100         if (r < 0)
101                 return r;
102
103         kfree(client);
104         return 0;
105 }
106
107 static struct i2c_driver wis_uda1342_driver = {
108         .driver = {
109                 .name   = "WIS UDA1342 I2C driver",
110         },
111         .id             = I2C_DRIVERID_WIS_UDA1342,
112         .detach_client  = wis_uda1342_detach,
113         .command        = wis_uda1342_command,
114 };
115
116 static int __init wis_uda1342_init(void)
117 {
118         int r;
119
120         r = i2c_add_driver(&wis_uda1342_driver);
121         if (r < 0)
122                 return r;
123         return wis_i2c_add_driver(wis_uda1342_driver.id, wis_uda1342_detect);
124 }
125
126 static void __exit wis_uda1342_cleanup(void)
127 {
128         wis_i2c_del_driver(wis_uda1342_detect);
129         i2c_del_driver(&wis_uda1342_driver);
130 }
131
132 module_init(wis_uda1342_init);
133 module_exit(wis_uda1342_cleanup);
134
135 MODULE_LICENSE("GPL v2");