100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2005-2006 Micronas USA Inc.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/i2c/uda1342.h>
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#include <linux/slab.h>
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static int write_reg(struct i2c_client *client, int reg, int value)
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{
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/* UDA1342 wants MSB first, but SMBus sends LSB first */
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i2c_smbus_write_word_data(client, reg, swab16(value));
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return 0;
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}
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static int uda1342_s_routing(struct v4l2_subdev *sd,
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u32 input, u32 output, u32 config)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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switch (input) {
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case UDA1342_IN1:
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write_reg(client, 0x00, 0x1241); /* select input 1 */
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break;
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case UDA1342_IN2:
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write_reg(client, 0x00, 0x1441); /* select input 2 */
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break;
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default:
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v4l2_err(sd, "input %d not supported\n", input);
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break;
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}
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return 0;
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}
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static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
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.s_routing = uda1342_s_routing,
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};
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static const struct v4l2_subdev_ops uda1342_ops = {
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.audio = &uda1342_audio_ops,
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};
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static int uda1342_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct v4l2_subdev *sd;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
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client->addr, adapter->name);
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sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
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if (sd == NULL)
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return -ENOMEM;
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v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
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write_reg(client, 0x00, 0x8000); /* reset registers */
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write_reg(client, 0x00, 0x1241); /* select input 1 */
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v4l_info(client, "chip found @ 0x%02x (%s)\n",
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client->addr << 1, client->adapter->name);
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return 0;
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}
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static void uda1342_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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}
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static const struct i2c_device_id uda1342_id[] = {
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{ "uda1342", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, uda1342_id);
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static struct i2c_driver uda1342_driver = {
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.driver = {
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.name = "uda1342",
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},
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.probe = uda1342_probe,
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.remove = uda1342_remove,
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.id_table = uda1342_id,
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};
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module_i2c_driver(uda1342_driver);
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MODULE_LICENSE("GPL v2");
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