uda1342.c revision b5dcee22
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/i2c/uda1342.h>
24#include <linux/slab.h>
25
26static 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
33static 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
52static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
53	.s_routing = uda1342_s_routing,
54};
55
56static const struct v4l2_subdev_ops uda1342_ops = {
57	.audio = &uda1342_audio_ops,
58};
59
60static 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
87static 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
95static const struct i2c_device_id uda1342_id[] = {
96	{ "uda1342", 0 },
97	{ }
98};
99MODULE_DEVICE_TABLE(i2c, uda1342_id);
100
101static 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
110module_i2c_driver(uda1342_driver);
111
112MODULE_LICENSE("GPL v2");
113