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, command: 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, reg: 0x00, value: 0x1241); /* select input 1 */
29 break;
30 case UDA1342_IN2:
31 write_reg(client, reg: 0x00, value: 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{
50 struct i2c_adapter *adapter = client->adapter;
51 struct v4l2_subdev *sd;
52
53 if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_WORD_DATA))
54 return -ENODEV;
55
56 dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
57 client->addr, adapter->name);
58
59 sd = devm_kzalloc(dev: &client->dev, size: sizeof(*sd), GFP_KERNEL);
60 if (sd == NULL)
61 return -ENOMEM;
62
63 v4l2_i2c_subdev_init(sd, client, ops: &uda1342_ops);
64
65 write_reg(client, reg: 0x00, value: 0x8000); /* reset registers */
66 write_reg(client, reg: 0x00, value: 0x1241); /* select input 1 */
67
68 v4l_info(client, "chip found @ 0x%02x (%s)\n",
69 client->addr << 1, client->adapter->name);
70
71 return 0;
72}
73
74static void uda1342_remove(struct i2c_client *client)
75{
76 struct v4l2_subdev *sd = i2c_get_clientdata(client);
77
78 v4l2_device_unregister_subdev(sd);
79}
80
81static const struct i2c_device_id uda1342_id[] = {
82 { "uda1342", 0 },
83 { }
84};
85MODULE_DEVICE_TABLE(i2c, uda1342_id);
86
87static struct i2c_driver uda1342_driver = {
88 .driver = {
89 .name = "uda1342",
90 },
91 .probe = uda1342_probe,
92 .remove = uda1342_remove,
93 .id_table = uda1342_id,
94};
95
96module_i2c_driver(uda1342_driver);
97
98MODULE_LICENSE("GPL v2");
99

source code of linux/drivers/media/i2c/uda1342.c