LXR linux/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
 153