Release 4.7 drivers/media/i2c/uda1342.c
/*
* Copyright (C) 2005-2006 Micronas USA Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/i2c/uda1342.h>
#include <linux/slab.h>
static int write_reg(struct i2c_client *client, int reg, int value)
{
/* UDA1342 wants MSB first, but SMBus sends LSB first */
i2c_smbus_write_word_data(client, reg, swab16(value));
return 0;
}
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static int uda1342_s_routing(struct v4l2_subdev *sd,
u32 input, u32 output, u32 config)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
switch (input) {
case UDA1342_IN1:
write_reg(client, 0x00, 0x1241); /* select input 1 */
break;
case UDA1342_IN2:
write_reg(client, 0x00, 0x1441); /* select input 2 */
break;
default:
v4l2_err(sd, "input %d not supported\n", input);
break;
}
return 0;
}
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static const struct v4l2_subdev_audio_ops uda1342_audio_ops = {
.s_routing = uda1342_s_routing,
};
static const struct v4l2_subdev_ops uda1342_ops = {
.audio = &uda1342_audio_ops,
};
static int uda1342_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct v4l2_subdev *sd;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
return -ENODEV;
dev_dbg(&client->dev, "initializing UDA1342 at address %d on %s\n",
client->addr, adapter->name);
sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
if (sd == NULL)
return -ENOMEM;
v4l2_i2c_subdev_init(sd, client, &uda1342_ops);
write_reg(client, 0x00, 0x8000); /* reset registers */
write_reg(client, 0x00, 0x1241); /* select input 1 */
v4l_info(client, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
return 0;
}
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static int uda1342_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
return 0;
}
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static const struct i2c_device_id uda1342_id[] = {
{ "uda1342", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, uda1342_id);
static struct i2c_driver uda1342_driver = {
.driver = {
.name = "uda1342",
},
.probe = uda1342_probe,
.remove = uda1342_remove,
.id_table = uda1342_id,
};
module_i2c_driver(uda1342_driver);
MODULE_LICENSE("GPL v2");
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