40199c50b8
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: Chaithrika U S <chaithrika@ti.com> Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/*
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* ths7303- THS7303 Video Amplifier driver
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*
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* Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed .as is. WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/ctype.h>
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#include <linux/i2c.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-subdev.h>
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#include <media/v4l2-chip-ident.h>
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MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
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MODULE_AUTHOR("Chaithrika U S");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Debug level 0-1");
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/* following function is used to set ths7303 */
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static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std)
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{
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int err = 0;
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u8 val;
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struct i2c_client *client;
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client = v4l2_get_subdevdata(sd);
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if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
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val = 0x02;
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v4l2_dbg(1, debug, sd, "setting value for SDTV format\n");
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} else {
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val = 0x00;
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v4l2_dbg(1, debug, sd, "disabling all channels\n");
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}
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err |= i2c_smbus_write_byte_data(client, 0x01, val);
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err |= i2c_smbus_write_byte_data(client, 0x02, val);
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err |= i2c_smbus_write_byte_data(client, 0x03, val);
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if (err)
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v4l2_err(sd, "write failed\n");
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return err;
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}
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static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
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{
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return ths7303_setvalue(sd, norm);
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}
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static int ths7303_g_chip_ident(struct v4l2_subdev *sd,
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struct v4l2_dbg_chip_ident *chip)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0);
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}
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static const struct v4l2_subdev_video_ops ths7303_video_ops = {
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.s_std_output = ths7303_s_std_output,
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};
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static const struct v4l2_subdev_core_ops ths7303_core_ops = {
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.g_chip_ident = ths7303_g_chip_ident,
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};
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static const struct v4l2_subdev_ops ths7303_ops = {
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.core = &ths7303_core_ops,
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.video = &ths7303_video_ops,
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};
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static int ths7303_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct v4l2_subdev *sd;
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v4l2_std_id std_id = V4L2_STD_NTSC;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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sd = kzalloc(sizeof(struct v4l2_subdev), 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, &ths7303_ops);
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return ths7303_setvalue(sd, std_id);
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}
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static int ths7303_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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kfree(sd);
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return 0;
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}
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static const struct i2c_device_id ths7303_id[] = {
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{"ths7303", 0},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, ths7303_id);
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static struct i2c_driver ths7303_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "ths7303",
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},
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.probe = ths7303_probe,
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.remove = ths7303_remove,
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.id_table = ths7303_id,
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};
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static int __init ths7303_init(void)
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{
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return i2c_add_driver(&ths7303_driver);
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}
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static void __exit ths7303_exit(void)
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{
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i2c_del_driver(&ths7303_driver);
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}
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module_init(ths7303_init);
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module_exit(ths7303_exit);
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