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/i2c.h>
  20#include <linux/device.h>
  21#include <linux/delay.h>
  22#include <linux/module.h>
  23#include <linux/uaccess.h>
  24#include <linux/videodev2.h>
  25
  26#include <media/v4l2-device.h>
  27#include <media/v4l2-subdev.h>
  28#include <media/v4l2-chip-ident.h>
  29
  30MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
  31MODULE_AUTHOR("Chaithrika U S");
  32MODULE_LICENSE("GPL");
  33
  34static int debug;
  35module_param(debug, int, 0644);
  36MODULE_PARM_DESC(debug, "Debug level 0-1");
  37
  38/* following function is used to set ths7303 */
  39static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std)
  40{
  41        int err = 0;
  42        u8 val;
  43        struct i2c_client *client;
  44
  45        client = v4l2_get_subdevdata(sd);
  46
  47        if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
  48                val = 0x02;
  49                v4l2_dbg(1, debug, sd, "setting value for SDTV format\n");
  50        } else {
  51                val = 0x00;
  52                v4l2_dbg(1, debug, sd, "disabling all channels\n");
  53        }
  54
  55        err |= i2c_smbus_write_byte_data(client, 0x01, val);
  56        err |= i2c_smbus_write_byte_data(client, 0x02, val);
  57        err |= i2c_smbus_write_byte_data(client, 0x03, val);
  58
  59        if (err)
  60                v4l2_err(sd, "write failed\n");
  61
  62        return err;
  63}
  64
  65static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
  66{
  67        return ths7303_setvalue(sd, norm);
  68}
  69
  70static int ths7303_g_chip_ident(struct v4l2_subdev *sd,
  71                                struct v4l2_dbg_chip_ident *chip)
  72{
  73        struct i2c_client *client = v4l2_get_subdevdata(sd);
  74
  75        return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0);
  76}
  77
  78static const struct v4l2_subdev_video_ops ths7303_video_ops = {
  79        .s_std_output   = ths7303_s_std_output,
  80};
  81
  82static const struct v4l2_subdev_core_ops ths7303_core_ops = {
  83        .g_chip_ident = ths7303_g_chip_ident,
  84};
  85
  86static const struct v4l2_subdev_ops ths7303_ops = {
  87        .core   = &ths7303_core_ops,
  88        .video  = &ths7303_video_ops,
  89};
  90
  91static int ths7303_probe(struct i2c_client *client,
  92                        const struct i2c_device_id *id)
  93{
  94        struct v4l2_subdev *sd;
  95        v4l2_std_id std_id = V4L2_STD_NTSC;
  96
  97        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  98                return -ENODEV;
  99
 100        v4l_info(client, "chip found @ 0x%x (%s)\n",
 101                        client->addr << 1, client->adapter->name);
 102
 103        sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 104        if (sd == NULL)
 105                return -ENOMEM;
 106
 107        v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
 108
 109        return ths7303_setvalue(sd, std_id);
 110}
 111
 112static int ths7303_remove(struct i2c_client *client)
 113{
 114        struct v4l2_subdev *sd = i2c_get_clientdata(client);
 115
 116        v4l2_device_unregister_subdev(sd);
 117        kfree(sd);
 118
 119        return 0;
 120}
 121
 122static const struct i2c_device_id ths7303_id[] = {
 123        {"ths7303", 0},
 124        {},
 125};
 126
 127MODULE_DEVICE_TABLE(i2c, ths7303_id);
 128
 129static struct i2c_driver ths7303_driver = {
 130        .driver = {
 131                .owner  = THIS_MODULE,
 132                .name   = "ths7303",
 133        },
 134        .probe          = ths7303_probe,
 135        .remove         = ths7303_remove,
 136        .id_table       = ths7303_id,
 137};
 138
 139static int __init ths7303_init(void)
 140{
 141        return i2c_add_driver(&ths7303_driver);
 142}
 143
 144static void __exit ths7303_exit(void)
 145{
 146        i2c_del_driver(&ths7303_driver);
 147}
 148
 149module_init(ths7303_init);
 150module_exit(ths7303_exit);
 151
 152