1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2005-2006 Micronas USA Inc.
4 */
5
6#include <linux/module.h>
7#include <linux/init.h>
8#include <linux/i2c.h>
9#include <linux/videodev2.h>
10#include <media/v4l2-device.h>
11#include <media/i2c/uda1342.h>
12#include <linux/slab.h>
13
14static int write_reg(struct i2c_client *client, int reg, int value)
15{
16	/* UDA1342 wants MSB first, but SMBus sends LSB first */
17	i2c_smbus_write_word_data(client, reg, swab16(value));
18	return 0;
19}
20
21static int uda1342_s_routing(struct v4l2_subdev *sd,
22		u32 input, u32 output, u32 config)
23{
24	struct i2c_client *client = v4l2_get_subdevdata(sd);
25
26	switch (input) {
27	case UDA1342_IN1:
28		write_reg(client, 0x00, 0x1241); /* select input 1 */
29		break;
30	case UDA1342_IN2:
31		write_reg(client, 0x00, 0x1441); /* select input 2 */
32		break;
33	default:
34		v4l2_err(sd, "input %d not supported\n", input);
35		break;
36	}
37	return 0;
38}
39
40static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
41	.s_routing = uda1342_s_routing,
42};
43
44static const struct v4l2_subdev_ops uda1342_ops = {
45	.audio = &uda1342_audio_ops,
46};
47
48static int uda1342_probe(struct i2c_client *client,
49			     const struct i2c_device_id *id)
50{
51	struct i2c_adapter *adapter = client->adapter;
52	struct v4l2_subdev *sd;
53
54	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
55		return -ENODEV;
56
57	dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
58		client->addr, adapter->name);
59
60	sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
61	if (sd == NULL)
62		return -ENOMEM;
63
64	v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
65
66	write_reg(client, 0x00, 0x8000); /* reset registers */
67	write_reg(client, 0x00, 0x1241); /* select input 1 */
68
69	v4l_info(client, "chip found @ 0x%02x (%s)\n",
70			client->addr << 1, client->adapter->name);
71
72	return 0;
73}
74
75static int uda1342_remove(struct i2c_client *client)
76{
77	struct v4l2_subdev *sd = i2c_get_clientdata(client);
78
79	v4l2_device_unregister_subdev(sd);
80	return 0;
81}
82
83static const struct i2c_device_id uda1342_id[] = {
84	{ "uda1342", 0 },
85	{ }
86};
87MODULE_DEVICE_TABLE(i2c, uda1342_id);
88
89static struct i2c_driver uda1342_driver = {
90	.driver = {
91		.name	= "uda1342",
92	},
93	.probe		= uda1342_probe,
94	.remove		= uda1342_remove,
95	.id_table	= uda1342_id,
96};
97
98module_i2c_driver(uda1342_driver);
99
100MODULE_LICENSE("GPL v2");
101