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// SPDX-License-Identifier: GPL-2.0-or-later
/*
tea6415c - i2c-driver for the tea6415c by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
The tea6415c is a bus controlled video-matrix-switch
with 8 inputs and 6 outputs.
It is cascadable, i.e. it can be found at the addresses
0x86 and 0x06 on the i2c-bus.
For detailed information download the specifications directly
from SGS Thomson at http://www.st.com
*/
#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include "tea6415c.h"
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tea6415c driver");
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level (0-1)");
/* makes a connection between the input-pin 'i' and the output-pin 'o' */
static int tea6415c_s_routing(struct v4l2_subdev *sd,
u32 i, u32 o, u32 config)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
u8 byte = 0;
int ret;
v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
/* check if the pins are valid */
if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
&& (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
return -EINVAL;
/* to understand this, have a look at the tea6415c-specs (p.5) */
switch (o) {
case 18:
byte = 0x00;
break;
case 14:
byte = 0x20;
break;
case 16:
byte = 0x10;
break;
case 17:
byte = 0x08;
break;
case 15:
byte = 0x18;
break;
case 13:
byte = 0x28;
break;
}
switch (i) {
case 5:
byte |= 0x00;
break;
case 8:
byte |= 0x04;
break;
case 3:
byte |= 0x02;
break;
case 20:
byte |= 0x06;
break;
case 6:
byte |= 0x01;
break;
case 10:
byte |= 0x05;
break;
case 1:
byte |= 0x03;
break;
case 11:
byte |= 0x07;
break;
}
ret = i2c_smbus_write_byte(client, byte);
if (ret) {
v4l2_dbg(1, debug, sd,
"i2c_smbus_write_byte() failed, ret:%d\n", ret);
return -EIO;
}
return ret;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
.s_routing = tea6415c_s_routing,
};
static const struct v4l2_subdev_ops tea6415c_ops = {
.video = &tea6415c_video_ops,
};
static int tea6415c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct v4l2_subdev *sd;
/* let's see whether this adapter can support what we need */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
return -EIO;
v4l_info(client, "chip found @ 0x%x (%s)\n",
client->addr << 1, client->adapter->name);
sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
if (sd == NULL)
return -ENOMEM;
v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
return 0;
}
static int tea6415c_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
return 0;
}
static const struct i2c_device_id tea6415c_id[] = {
{ "tea6415c", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tea6415c_id);
static struct i2c_driver tea6415c_driver = {
.driver = {
.name = "tea6415c",
},
.probe = tea6415c_probe,
.remove = tea6415c_remove,
.id_table = tea6415c_id,
};
module_i2c_driver(tea6415c_driver);
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