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/*
* ths7303- THS7303 Video Amplifier driver
*
* Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed .as is. WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/i2c.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-chip-ident.h>
MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
MODULE_AUTHOR("Chaithrika U S");
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level 0-1");
/* following function is used to set ths7303 */
static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std)
{
int err = 0;
u8 val;
struct i2c_client *client;
client = v4l2_get_subdevdata(sd);
if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
val = 0x02;
v4l2_dbg(1, debug, sd, "setting value for SDTV format\n");
} else {
val = 0x00;
v4l2_dbg(1, debug, sd, "disabling all channels\n");
}
err |= i2c_smbus_write_byte_data(client, 0x01, val);
err |= i2c_smbus_write_byte_data(client, 0x02, val);
err |= i2c_smbus_write_byte_data(client, 0x03, val);
if (err)
v4l2_err(sd, "write failed\n");
return err;
}
static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
{
return ths7303_setvalue(sd, norm);
}
static int ths7303_g_chip_ident(struct v4l2_subdev *sd,
struct v4l2_dbg_chip_ident *chip)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0);
}
static const struct v4l2_subdev_video_ops ths7303_video_ops = {
.s_std_output = ths7303_s_std_output,
};
static const struct v4l2_subdev_core_ops ths7303_core_ops = {
.g_chip_ident = ths7303_g_chip_ident,
};
static const struct v4l2_subdev_ops ths7303_ops = {
.core = &ths7303_core_ops,
.video = &ths7303_video_ops,
};
static int ths7303_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct v4l2_subdev *sd;
v4l2_std_id std_id = V4L2_STD_NTSC;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
v4l_info(client, "chip found @ 0x%x (%s)\n",
client->addr << 1, client->adapter->name);
sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
if (sd == NULL)
return -ENOMEM;
v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
return ths7303_setvalue(sd, std_id);
}
static int ths7303_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
kfree(sd);
return 0;
}
static const struct i2c_device_id ths7303_id[] = {
{"ths7303", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, ths7303_id);
static struct i2c_driver ths7303_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "ths7303",
},
.probe = ths7303_probe,
.remove = ths7303_remove,
.id_table = ths7303_id,
};
static int __init ths7303_init(void)
{
return i2c_add_driver(&ths7303_driver);
}
static void __exit ths7303_exit(void)
{
i2c_del_driver(&ths7303_driver);
}
module_init(ths7303_init);
module_exit(ths7303_exit);
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