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Commit 40199c50 authored by Chaithrika U S's avatar Chaithrika U S Committed by Mauro Carvalho Chehab
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V4L/DVB (11742): TI THS7303 video amplifier driver code 



This patch adds driver for TI THS7303 video amplifier. This driver is
implemented as a v4l2 sub device. Tested on TI DM646x EVM.

This version has updates based on review comments by Mauro Chehab.

Signed-off-by: default avatarChaithrika U S <chaithrika@ti.com>
Reviewed-by: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent b475f4ee

drivers/media/video/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -440,6 +440,15 @@ config VIDEO_ADV7175 
	  To compile this driver as a module, choose M here: the

	  module will be called adv7175.



config VIDEO_THS7303

	tristate "THS7303 Video Amplifier"

	depends on I2C

	help

	  Support for TI THS7303 video amplifier



	  To compile this driver as a module, choose M here: the

	  module will be called ths7303.



comment "Video improvement chips"



config VIDEO_UPD64031A

drivers/media/video/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ obj-$(CONFIG_VIDEO_BT819) += bt819.o 
obj-$(CONFIG_VIDEO_BT856) += bt856.o

obj-$(CONFIG_VIDEO_BT866) += bt866.o

obj-$(CONFIG_VIDEO_KS0127) += ks0127.o

obj-$(CONFIG_VIDEO_THS7303) += ths7303.o



obj-$(CONFIG_VIDEO_ZORAN) += zoran/

drivers/media/video/ths7303.c

0 → 100644
+151 −0
Original line number Diff line number Diff line 
/*

 * 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);

include/media/v4l2-chip-ident.h

+3 −0
Original line number Diff line number Diff line
@@ -137,6 +137,9 @@ enum { 
	/* module saa7191: just ident 7191 */

	V4L2_IDENT_SAA7191 = 7191,



	/* module ths7303: just ident 7303 */

	V4L2_IDENT_THS7303 = 7303,



	/* module wm8739: just ident 8739 */

	V4L2_IDENT_WM8739 = 8739,