Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / media / i2c / 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/v4l2-device.h>
23 #include <media/uda1342.h>
24 #include <linux/slab.h>
25
26 static int write_reg(struct i2c_client *client, int reg, int value)
27 {
28         /* UDA1342 wants MSB first, but SMBus sends LSB first */
29         i2c_smbus_write_word_data(client, reg, swab16(value));
30         return 0;
31 }
32
33 static int uda1342_s_routing(struct v4l2_subdev *sd,
34                 u32 input, u32 output, u32 config)
35 {
36         struct i2c_client *client = v4l2_get_subdevdata(sd);
37
38         switch (input) {
39         case UDA1342_IN1:
40                 write_reg(client, 0x00, 0x1241); /* select input 1 */
41                 break;
42         case UDA1342_IN2:
43                 write_reg(client, 0x00, 0x1441); /* select input 2 */
44                 break;
45         default:
46                 v4l2_err(sd, "input %d not supported\n", input);
47                 break;
48         }
49         return 0;
50 }
51
52 static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
53         .s_routing = uda1342_s_routing,
54 };
55
56 static const struct v4l2_subdev_ops uda1342_ops = {
57         .audio = &uda1342_audio_ops,
58 };
59
60 static int uda1342_probe(struct i2c_client *client,
61                              const struct i2c_device_id *id)
62 {
63         struct i2c_adapter *adapter = client->adapter;
64         struct v4l2_subdev *sd;
65
66         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
67                 return -ENODEV;
68
69         dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
70                 client->addr, adapter->name);
71
72         sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
73         if (sd == NULL)
74                 return -ENOMEM;
75
76         v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
77
78         write_reg(client, 0x00, 0x8000); /* reset registers */
79         write_reg(client, 0x00, 0x1241); /* select input 1 */
80
81         v4l_info(client, "chip found @ 0x%02x (%s)\n",
82                         client->addr << 1, client->adapter->name);
83
84         return 0;
85 }
86
87 static int uda1342_remove(struct i2c_client *client)
88 {
89         struct v4l2_subdev *sd = i2c_get_clientdata(client);
90
91         v4l2_device_unregister_subdev(sd);
92         return 0;
93 }
94
95 static const struct i2c_device_id uda1342_id[] = {
96         { "uda1342", 0 },
97         { }
98 };
99 MODULE_DEVICE_TABLE(i2c, uda1342_id);
100
101 static struct i2c_driver uda1342_driver = {
102         .driver = {
103                 .name   = "uda1342",
104         },
105         .probe          = uda1342_probe,
106         .remove         = uda1342_remove,
107         .id_table       = uda1342_id,
108 };
109
110 module_i2c_driver(uda1342_driver);
111
112 MODULE_LICENSE("GPL v2");