/drivers/media/video/ths7303.c

  1/*
  2 * ths7303- THS7303 Video Amplifier driver
  3 *
  4 * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
  5 *
  6 * This program is free software; you can redistribute it and/or
  7 * modify it under the terms of the GNU General Public License as
  8 * published by the Free Software Foundation version 2.
  9 *
 10 * This program is distributed .as is. WITHOUT ANY WARRANTY of any
 11 * kind, whether express or implied; without even the implied warranty
 12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13 * GNU General Public License for more details.
 14 */
 15
 16#include <linux/kernel.h>
 17#include <linux/init.h>
 18#include <linux/ctype.h>
 19#include <linux/slab.h>
 20#include <linux/i2c.h>
 21#include <linux/device.h>
 22#include <linux/delay.h>
 23#include <linux/module.h>
 24#include <linux/uaccess.h>
 25#include <linux/videodev2.h>
 26
 27#include <media/v4l2-device.h>
 28#include <media/v4l2-subdev.h>
 29#include <media/v4l2-chip-ident.h>
 30
 31MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
 32MODULE_AUTHOR("Chaithrika U S");
 33MODULE_LICENSE("GPL");
 34
 35static int debug;
 36module_param(debug, int, 0644);
 37MODULE_PARM_DESC(debug, "Debug level 0-1");
 38
 39/* following function is used to set ths7303 */
 40static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std)
 41{
 42	int err = 0;
 43	u8 val;
 44	struct i2c_client *client;
 45
 46	client = v4l2_get_subdevdata(sd);
 47
 48	if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
 49		val = 0x02;
 50		v4l2_dbg(1, debug, sd, "setting value for SDTV format\n");
 51	} else {
 52		val = 0x00;
 53		v4l2_dbg(1, debug, sd, "disabling all channels\n");
 54	}
 55
 56	err |= i2c_smbus_write_byte_data(client, 0x01, val);
 57	err |= i2c_smbus_write_byte_data(client, 0x02, val);
 58	err |= i2c_smbus_write_byte_data(client, 0x03, val);
 59
 60	if (err)
 61		v4l2_err(sd, "write failed\n");
 62
 63	return err;
 64}
 65
 66static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
 67{
 68	return ths7303_setvalue(sd, norm);
 69}
 70
 71static int ths7303_g_chip_ident(struct v4l2_subdev *sd,
 72				struct v4l2_dbg_chip_ident *chip)
 73{
 74	struct i2c_client *client = v4l2_get_subdevdata(sd);
 75
 76	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0);
 77}
 78
 79static const struct v4l2_subdev_video_ops ths7303_video_ops = {
 80	.s_std_output	= ths7303_s_std_output,
 81};
 82
 83static const struct v4l2_subdev_core_ops ths7303_core_ops = {
 84	.g_chip_ident = ths7303_g_chip_ident,
 85};
 86
 87static const struct v4l2_subdev_ops ths7303_ops = {
 88	.core	= &ths7303_core_ops,
 89	.video 	= &ths7303_video_ops,
 90};
 91
 92static int ths7303_probe(struct i2c_client *client,
 93			const struct i2c_device_id *id)
 94{
 95	struct v4l2_subdev *sd;
 96	v4l2_std_id std_id = V4L2_STD_NTSC;
 97
 98	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 99		return -ENODEV;
100
101	v4l_info(client, "chip found @ 0x%x (%s)\n",
102			client->addr << 1, client->adapter->name);
103
104	sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
105	if (sd == NULL)
106		return -ENOMEM;
107
108	v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
109
110	return ths7303_setvalue(sd, std_id);
111}
112
113static int ths7303_remove(struct i2c_client *client)
114{
115	struct v4l2_subdev *sd = i2c_get_clientdata(client);
116
117	v4l2_device_unregister_subdev(sd);
118	kfree(sd);
119
120	return 0;
121}
122
123static const struct i2c_device_id ths7303_id[] = {
124	{"ths7303", 0},
125	{},
126};
127
128MODULE_DEVICE_TABLE(i2c, ths7303_id);
129
130static struct i2c_driver ths7303_driver = {
131	.driver = {
132		.owner	= THIS_MODULE,
133		.name	= "ths7303",
134	},
135	.probe		= ths7303_probe,
136	.remove		= ths7303_remove,
137	.id_table	= ths7303_id,
138};
139
140static int __init ths7303_init(void)
141{
142	return i2c_add_driver(&ths7303_driver);
143}
144
145static void __exit ths7303_exit(void)
146{
147	i2c_del_driver(&ths7303_driver);
148}
149
150module_init(ths7303_init);
151module_exit(ths7303_exit);
152