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[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / media / video / tvp514x.c

/*
 * drivers/media/video/tvp514x.c
 *
 * TI TVP5146/47 decoder driver
 *
 * Copyright (C) 2008 Texas Instruments Inc
 * Author: Vaibhav Hiremath <hvaibhav@ti.com>
 *
 * Contributors:
 *     Sivaraj R <sivaraj@ti.com>
 *     Brijesh R Jadav <brijesh.j@ti.com>
 *     Hardik Shah <hardik.shah@ti.com>
 *     Manjunath Hadli <mrh@ti.com>
 *     Karicheri Muralidharan <m-karicheri2@ti.com>
 *
 * This package is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/videodev2.h>

#include <media/v4l2-device.h>
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/tvp514x.h>

#include "tvp514x_regs.h"

/* Module Name */
#define TVP514X_MODULE_NAME             "tvp514x"

/* Private macros for TVP */
#define I2C_RETRY_COUNT                 (5)
#define LOCK_RETRY_COUNT                (5)
#define LOCK_RETRY_DELAY                (200)

/* Debug functions */
static int debug;
module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "Debug level (0-1)");

MODULE_AUTHOR("Texas Instruments");
MODULE_DESCRIPTION("TVP514X linux decoder driver");
MODULE_LICENSE("GPL");

/* enum tvp514x_std - enum for supported standards */
enum tvp514x_std {
        STD_NTSC_MJ = 0,
        STD_PAL_BDGHIN,
        STD_INVALID
};

/**
 * struct tvp514x_std_info - Structure to store standard informations
 * @width: Line width in pixels
 * @height:Number of active lines
 * @video_std: Value to write in REG_VIDEO_STD register
 * @standard: v4l2 standard structure information
 */
struct tvp514x_std_info {
        unsigned long width;
        unsigned long height;
        u8 video_std;
        struct v4l2_standard standard;
};

static struct tvp514x_reg tvp514x_reg_list_default[0x40];

static int tvp514x_s_stream(struct v4l2_subdev *sd, int enable);
/**
 * struct tvp514x_decoder - TVP5146/47 decoder object
 * @sd: Subdevice Slave handle
 * @tvp514x_regs: copy of hw's regs with preset values.
 * @pdata: Board specific
 * @ver: Chip version
 * @streaming: TVP5146/47 decoder streaming - enabled or disabled.
 * @current_std: Current standard
 * @num_stds: Number of standards
 * @std_list: Standards list
 * @input: Input routing at chip level
 * @output: Output routing at chip level
 */
struct tvp514x_decoder {
        struct v4l2_subdev sd;
        struct tvp514x_reg tvp514x_regs[ARRAY_SIZE(tvp514x_reg_list_default)];
        const struct tvp514x_platform_data *pdata;

        int ver;
        int streaming;

        enum tvp514x_std current_std;
        int num_stds;
        const struct tvp514x_std_info *std_list;
        /* Input and Output Routing parameters */
        u32 input;
        u32 output;
};

/* TVP514x default register values */
static struct tvp514x_reg tvp514x_reg_list_default[] = {
        /* Composite selected */
        {TOK_WRITE, REG_INPUT_SEL, 0x05},
        {TOK_WRITE, REG_AFE_GAIN_CTRL, 0x0F},
        /* Auto mode */
        {TOK_WRITE, REG_VIDEO_STD, 0x00},
        {TOK_WRITE, REG_OPERATION_MODE, 0x00},
        {TOK_SKIP, REG_AUTOSWITCH_MASK, 0x3F},
        {TOK_WRITE, REG_COLOR_KILLER, 0x10},
        {TOK_WRITE, REG_LUMA_CONTROL1, 0x00},
        {TOK_WRITE, REG_LUMA_CONTROL2, 0x00},
        {TOK_WRITE, REG_LUMA_CONTROL3, 0x02},
        {TOK_WRITE, REG_BRIGHTNESS, 0x80},
        {TOK_WRITE, REG_CONTRAST, 0x80},
        {TOK_WRITE, REG_SATURATION, 0x80},
        {TOK_WRITE, REG_HUE, 0x00},
        {TOK_WRITE, REG_CHROMA_CONTROL1, 0x00},
        {TOK_WRITE, REG_CHROMA_CONTROL2, 0x0E},
        /* Reserved */
        {TOK_SKIP, 0x0F, 0x00},
        {TOK_WRITE, REG_COMP_PR_SATURATION, 0x80},
        {TOK_WRITE, REG_COMP_Y_CONTRAST, 0x80},
        {TOK_WRITE, REG_COMP_PB_SATURATION, 0x80},
        /* Reserved */
        {TOK_SKIP, 0x13, 0x00},
        {TOK_WRITE, REG_COMP_Y_BRIGHTNESS, 0x80},
        /* Reserved */
        {TOK_SKIP, 0x15, 0x00},
        /* NTSC timing */
        {TOK_SKIP, REG_AVID_START_PIXEL_LSB, 0x55},
        {TOK_SKIP, REG_AVID_START_PIXEL_MSB, 0x00},
        {TOK_SKIP, REG_AVID_STOP_PIXEL_LSB, 0x25},
        {TOK_SKIP, REG_AVID_STOP_PIXEL_MSB, 0x03},
        /* NTSC timing */
        {TOK_SKIP, REG_HSYNC_START_PIXEL_LSB, 0x00},
        {TOK_SKIP, REG_HSYNC_START_PIXEL_MSB, 0x00},
        {TOK_SKIP, REG_HSYNC_STOP_PIXEL_LSB, 0x40},
        {TOK_SKIP, REG_HSYNC_STOP_PIXEL_MSB, 0x00},
        /* NTSC timing */
        {TOK_SKIP, REG_VSYNC_START_LINE_LSB, 0x04},
        {TOK_SKIP, REG_VSYNC_START_LINE_MSB, 0x00},
        {TOK_SKIP, REG_VSYNC_STOP_LINE_LSB, 0x07},
        {TOK_SKIP, REG_VSYNC_STOP_LINE_MSB, 0x00},
        /* NTSC timing */
        {TOK_SKIP, REG_VBLK_START_LINE_LSB, 0x01},
        {TOK_SKIP, REG_VBLK_START_LINE_MSB, 0x00},
        {TOK_SKIP, REG_VBLK_STOP_LINE_LSB, 0x15},
        {TOK_SKIP, REG_VBLK_STOP_LINE_MSB, 0x00},
        /* Reserved */
        {TOK_SKIP, 0x26, 0x00},
        /* Reserved */
        {TOK_SKIP, 0x27, 0x00},
        {TOK_SKIP, REG_FAST_SWTICH_CONTROL, 0xCC},
        /* Reserved */
        {TOK_SKIP, 0x29, 0x00},
        {TOK_SKIP, REG_FAST_SWTICH_SCART_DELAY, 0x00},
        /* Reserved */
        {TOK_SKIP, 0x2B, 0x00},
        {TOK_SKIP, REG_SCART_DELAY, 0x00},
        {TOK_SKIP, REG_CTI_DELAY, 0x00},
        {TOK_SKIP, REG_CTI_CONTROL, 0x00},
        /* Reserved */
        {TOK_SKIP, 0x2F, 0x00},
        /* Reserved */
        {TOK_SKIP, 0x30, 0x00},
        /* Reserved */
        {TOK_SKIP, 0x31, 0x00},
        /* HS, VS active high */
        {TOK_WRITE, REG_SYNC_CONTROL, 0x00},
        /* 10-bit BT.656 */
        {TOK_WRITE, REG_OUTPUT_FORMATTER1, 0x00},
        /* Enable clk & data */
        {TOK_WRITE, REG_OUTPUT_FORMATTER2, 0x11},
        /* Enable AVID & FLD */
        {TOK_WRITE, REG_OUTPUT_FORMATTER3, 0xEE},
        /* Enable VS & HS */
        {TOK_WRITE, REG_OUTPUT_FORMATTER4, 0xAF},
        {TOK_WRITE, REG_OUTPUT_FORMATTER5, 0xFF},
        {TOK_WRITE, REG_OUTPUT_FORMATTER6, 0xFF},
        /* Clear status */
        {TOK_WRITE, REG_CLEAR_LOST_LOCK, 0x01},
        {TOK_TERM, 0, 0},
};

/**
 * Supported standards -
 *
 * Currently supports two standards only, need to add support for rest of the
 * modes, like SECAM, etc...
 */
static const struct tvp514x_std_info tvp514x_std_list[] = {
        /* Standard: STD_NTSC_MJ */
        [STD_NTSC_MJ] = {
         .width = NTSC_NUM_ACTIVE_PIXELS,
         .height = NTSC_NUM_ACTIVE_LINES,
         .video_std = VIDEO_STD_NTSC_MJ_BIT,
         .standard = {
                      .index = 0,
                      .id = V4L2_STD_NTSC,
                      .name = "NTSC",
                      .frameperiod = {1001, 30000},
                      .framelines = 525
                     },
        /* Standard: STD_PAL_BDGHIN */
        },
        [STD_PAL_BDGHIN] = {
         .width = PAL_NUM_ACTIVE_PIXELS,
         .height = PAL_NUM_ACTIVE_LINES,
         .video_std = VIDEO_STD_PAL_BDGHIN_BIT,
         .standard = {
                      .index = 1,
                      .id = V4L2_STD_PAL,
                      .name = "PAL",
                      .frameperiod = {1, 25},
                      .framelines = 625
                     },
        },
        /* Standard: need to add for additional standard */
};


static inline struct tvp514x_decoder *to_decoder(struct v4l2_subdev *sd)
{
        return container_of(sd, struct tvp514x_decoder, sd);
}


/**
 * tvp514x_read_reg() - Read a value from a register in an TVP5146/47.
 * @sd: ptr to v4l2_subdev struct
 * @reg: TVP5146/47 register address
 *
 * Returns value read if successful, or non-zero (-1) otherwise.
 */
static int tvp514x_read_reg(struct v4l2_subdev *sd, u8 reg)
{
        int err, retry = 0;
        struct i2c_client *client = v4l2_get_subdevdata(sd);

read_again:

        err = i2c_smbus_read_byte_data(client, reg);
        if (err < 0) {
                if (retry <= I2C_RETRY_COUNT) {
                        v4l2_warn(sd, "Read: retry ... %d\n", retry);
                        retry++;
                        msleep_interruptible(10);
                        goto read_again;
                }
        }

        return err;
}

/**
 * dump_reg() - dump the register content of TVP5146/47.
 * @sd: ptr to v4l2_subdev struct
 * @reg: TVP5146/47 register address
 */
static void dump_reg(struct v4l2_subdev *sd, u8 reg)
{
        u32 val;

        val = tvp514x_read_reg(sd, reg);
        v4l2_info(sd, "Reg(0x%.2X): 0x%.2X\n", reg, val);
}

/**
 * tvp514x_write_reg() - Write a value to a register in TVP5146/47
 * @sd: ptr to v4l2_subdev struct
 * @reg: TVP5146/47 register address
 * @val: value to be written to the register
 *
 * Write a value to a register in an TVP5146/47 decoder device.
 * Returns zero if successful, or non-zero otherwise.
 */
static int tvp514x_write_reg(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        int err, retry = 0;
        struct i2c_client *client = v4l2_get_subdevdata(sd);

write_again:

        err = i2c_smbus_write_byte_data(client, reg, val);
        if (err) {
                if (retry <= I2C_RETRY_COUNT) {
                        v4l2_warn(sd, "Write: retry ... %d\n", retry);
                        retry++;
                        msleep_interruptible(10);
                        goto write_again;
                }
        }

        return err;
}

/**
 * tvp514x_write_regs() : Initializes a list of TVP5146/47 registers
 * @sd: ptr to v4l2_subdev struct
 * @reglist: list of TVP5146/47 registers and values
 *
 * Initializes a list of TVP5146/47 registers:-
 *              if token is TOK_TERM, then entire write operation terminates
 *              if token is TOK_DELAY, then a delay of 'val' msec is introduced
 *              if token is TOK_SKIP, then the register write is skipped
 *              if token is TOK_WRITE, then the register write is performed
 * Returns zero if successful, or non-zero otherwise.
 */
static int tvp514x_write_regs(struct v4l2_subdev *sd,
                              const struct tvp514x_reg reglist[])
{
        int err;
        const struct tvp514x_reg *next = reglist;

        for (; next->token != TOK_TERM; next++) {
                if (next->token == TOK_DELAY) {
                        msleep(next->val);
                        continue;
                }

                if (next->token == TOK_SKIP)
                        continue;

                err = tvp514x_write_reg(sd, next->reg, (u8) next->val);
                if (err) {
                        v4l2_err(sd, "Write failed. Err[%d]\n", err);
                        return err;
                }
        }
        return 0;
}

/**
 * tvp514x_query_current_std() : Query the current standard detected by TVP5146/47
 * @sd: ptr to v4l2_subdev struct
 *
 * Returns the current standard detected by TVP5146/47, STD_INVALID if there is no
 * standard detected.
 */
static enum tvp514x_std tvp514x_query_current_std(struct v4l2_subdev *sd)
{
        u8 std, std_status;

        std = tvp514x_read_reg(sd, REG_VIDEO_STD);
        if ((std & VIDEO_STD_MASK) == VIDEO_STD_AUTO_SWITCH_BIT)
                /* use the standard status register */
                std_status = tvp514x_read_reg(sd, REG_VIDEO_STD_STATUS);
        else
                /* use the standard register itself */
                std_status = std;

        switch (std_status & VIDEO_STD_MASK) {
        case VIDEO_STD_NTSC_MJ_BIT:
                return STD_NTSC_MJ;

        case VIDEO_STD_PAL_BDGHIN_BIT:
                return STD_PAL_BDGHIN;

        default:
                return STD_INVALID;
        }

        return STD_INVALID;
}

/* TVP5146/47 register dump function */
static void tvp514x_reg_dump(struct v4l2_subdev *sd)
{
        dump_reg(sd, REG_INPUT_SEL);
        dump_reg(sd, REG_AFE_GAIN_CTRL);
        dump_reg(sd, REG_VIDEO_STD);
        dump_reg(sd, REG_OPERATION_MODE);
        dump_reg(sd, REG_COLOR_KILLER);
        dump_reg(sd, REG_LUMA_CONTROL1);
        dump_reg(sd, REG_LUMA_CONTROL2);
        dump_reg(sd, REG_LUMA_CONTROL3);
        dump_reg(sd, REG_BRIGHTNESS);
        dump_reg(sd, REG_CONTRAST);
        dump_reg(sd, REG_SATURATION);
        dump_reg(sd, REG_HUE);
        dump_reg(sd, REG_CHROMA_CONTROL1);
        dump_reg(sd, REG_CHROMA_CONTROL2);
        dump_reg(sd, REG_COMP_PR_SATURATION);
        dump_reg(sd, REG_COMP_Y_CONTRAST);
        dump_reg(sd, REG_COMP_PB_SATURATION);
        dump_reg(sd, REG_COMP_Y_BRIGHTNESS);
        dump_reg(sd, REG_AVID_START_PIXEL_LSB);
        dump_reg(sd, REG_AVID_START_PIXEL_MSB);
        dump_reg(sd, REG_AVID_STOP_PIXEL_LSB);
        dump_reg(sd, REG_AVID_STOP_PIXEL_MSB);
        dump_reg(sd, REG_HSYNC_START_PIXEL_LSB);
        dump_reg(sd, REG_HSYNC_START_PIXEL_MSB);
        dump_reg(sd, REG_HSYNC_STOP_PIXEL_LSB);
        dump_reg(sd, REG_HSYNC_STOP_PIXEL_MSB);
        dump_reg(sd, REG_VSYNC_START_LINE_LSB);
        dump_reg(sd, REG_VSYNC_START_LINE_MSB);
        dump_reg(sd, REG_VSYNC_STOP_LINE_LSB);
        dump_reg(sd, REG_VSYNC_STOP_LINE_MSB);
        dump_reg(sd, REG_VBLK_START_LINE_LSB);
        dump_reg(sd, REG_VBLK_START_LINE_MSB);
        dump_reg(sd, REG_VBLK_STOP_LINE_LSB);
        dump_reg(sd, REG_VBLK_STOP_LINE_MSB);
        dump_reg(sd, REG_SYNC_CONTROL);
        dump_reg(sd, REG_OUTPUT_FORMATTER1);
        dump_reg(sd, REG_OUTPUT_FORMATTER2);
        dump_reg(sd, REG_OUTPUT_FORMATTER3);
        dump_reg(sd, REG_OUTPUT_FORMATTER4);
        dump_reg(sd, REG_OUTPUT_FORMATTER5);
        dump_reg(sd, REG_OUTPUT_FORMATTER6);
        dump_reg(sd, REG_CLEAR_LOST_LOCK);
}

/**
 * tvp514x_configure() - Configure the TVP5146/47 registers
 * @sd: ptr to v4l2_subdev struct
 * @decoder: ptr to tvp514x_decoder structure
 *
 * Returns zero if successful, or non-zero otherwise.
 */
static int tvp514x_configure(struct v4l2_subdev *sd,
                struct tvp514x_decoder *decoder)
{
        int err;

        /* common register initialization */
        err =
            tvp514x_write_regs(sd, decoder->tvp514x_regs);
        if (err)
                return err;

        if (debug)
                tvp514x_reg_dump(sd);

        return 0;
}

/**
 * tvp514x_detect() - Detect if an tvp514x is present, and if so which revision.
 * @sd: pointer to standard V4L2 sub-device structure
 * @decoder: pointer to tvp514x_decoder structure
 *
 * A device is considered to be detected if the chip ID (LSB and MSB)
 * registers match the expected values.
 * Any value of the rom version register is accepted.
 * Returns ENODEV error number if no device is detected, or zero
 * if a device is detected.
 */
static int tvp514x_detect(struct v4l2_subdev *sd,
                struct tvp514x_decoder *decoder)
{
        u8 chip_id_msb, chip_id_lsb, rom_ver;
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        chip_id_msb = tvp514x_read_reg(sd, REG_CHIP_ID_MSB);
        chip_id_lsb = tvp514x_read_reg(sd, REG_CHIP_ID_LSB);
        rom_ver = tvp514x_read_reg(sd, REG_ROM_VERSION);

        v4l2_dbg(1, debug, sd,
                 "chip id detected msb:0x%x lsb:0x%x rom version:0x%x\n",
                 chip_id_msb, chip_id_lsb, rom_ver);
        if ((chip_id_msb != TVP514X_CHIP_ID_MSB)
                || ((chip_id_lsb != TVP5146_CHIP_ID_LSB)
                && (chip_id_lsb != TVP5147_CHIP_ID_LSB))) {
                /* We didn't read the values we expected, so this must not be
                 * an TVP5146/47.
                 */
                v4l2_err(sd, "chip id mismatch msb:0x%x lsb:0x%x\n",
                                chip_id_msb, chip_id_lsb);
                return -ENODEV;
        }

        decoder->ver = rom_ver;

        v4l2_info(sd, "%s (Version - 0x%.2x) found at 0x%x (%s)\n",
                        client->name, decoder->ver,
                        client->addr << 1, client->adapter->name);
        return 0;
}

/**
 * tvp514x_querystd() - V4L2 decoder interface handler for querystd
 * @sd: pointer to standard V4L2 sub-device structure
 * @std_id: standard V4L2 std_id ioctl enum
 *
 * Returns the current standard detected by TVP5146/47. If no active input is
 * detected then *std_id is set to 0 and the function returns 0.
 */
static int tvp514x_querystd(struct v4l2_subdev *sd, v4l2_std_id *std_id)
{
        struct tvp514x_decoder *decoder = to_decoder(sd);
        enum tvp514x_std current_std;
        enum tvp514x_input input_sel;
        u8 sync_lock_status, lock_mask;

        if (std_id == NULL)
                return -EINVAL;

        *std_id = V4L2_STD_UNKNOWN;

        /* query the current standard */
        current_std = tvp514x_query_current_std(sd);
        if (current_std == STD_INVALID)
                return 0;

        input_sel = decoder->input;

        switch (input_sel) {
        case INPUT_CVBS_VI1A:
        case INPUT_CVBS_VI1B:
        case INPUT_CVBS_VI1C:
        case INPUT_CVBS_VI2A:
        case INPUT_CVBS_VI2B:
        case INPUT_CVBS_VI2C:
        case INPUT_CVBS_VI3A:
        case INPUT_CVBS_VI3B:
        case INPUT_CVBS_VI3C:
        case INPUT_CVBS_VI4A:
                lock_mask = STATUS_CLR_SUBCAR_LOCK_BIT |
                        STATUS_HORZ_SYNC_LOCK_BIT |
                        STATUS_VIRT_SYNC_LOCK_BIT;
                break;

        case INPUT_SVIDEO_VI2A_VI1A:
        case INPUT_SVIDEO_VI2B_VI1B:
        case INPUT_SVIDEO_VI2C_VI1C:
        case INPUT_SVIDEO_VI2A_VI3A:
        case INPUT_SVIDEO_VI2B_VI3B:
        case INPUT_SVIDEO_VI2C_VI3C:
        case INPUT_SVIDEO_VI4A_VI1A:
        case INPUT_SVIDEO_VI4A_VI1B:
        case INPUT_SVIDEO_VI4A_VI1C:
        case INPUT_SVIDEO_VI4A_VI3A:
        case INPUT_SVIDEO_VI4A_VI3B:
        case INPUT_SVIDEO_VI4A_VI3C:
                lock_mask = STATUS_HORZ_SYNC_LOCK_BIT |
                        STATUS_VIRT_SYNC_LOCK_BIT;
                break;
                /*Need to add other interfaces*/
        default:
                return -EINVAL;
        }
        /* check whether signal is locked */
        sync_lock_status = tvp514x_read_reg(sd, REG_STATUS1);
        if (lock_mask != (sync_lock_status & lock_mask))
                return 0;       /* No input detected */

        *std_id = decoder->std_list[current_std].standard.id;

        v4l2_dbg(1, debug, sd, "Current STD: %s\n",
                        decoder->std_list[current_std].standard.name);
        return 0;
}

/**
 * tvp514x_s_std() - V4L2 decoder interface handler for s_std
 * @sd: pointer to standard V4L2 sub-device structure
 * @std_id: standard V4L2 v4l2_std_id ioctl enum
 *
 * If std_id is supported, sets the requested standard. Otherwise, returns
 * -EINVAL
 */
static int tvp514x_s_std(struct v4l2_subdev *sd, v4l2_std_id std_id)
{
        struct tvp514x_decoder *decoder = to_decoder(sd);
        int err, i;

        for (i = 0; i < decoder->num_stds; i++)
                if (std_id & decoder->std_list[i].standard.id)
                        break;

        if ((i == decoder->num_stds) || (i == STD_INVALID))
                return -EINVAL;

        err = tvp514x_write_reg(sd, REG_VIDEO_STD,
                                decoder->std_list[i].video_std);
        if (err)
                return err;

        decoder->current_std = i;
        decoder->tvp514x_regs[REG_VIDEO_STD].val =
                decoder->std_list[i].video_std;

        v4l2_dbg(1, debug, sd, "Standard set to: %s\n",
                        decoder->std_list[i].standard.name);
        return 0;
}

/**
 * tvp514x_s_routing() - V4L2 decoder interface handler for s_routing
 * @sd: pointer to standard V4L2 sub-device structure
 * @input: input selector for routing the signal
 * @output: output selector for routing the signal
 * @config: config value. Not used
 *
 * If index is valid, selects the requested input. Otherwise, returns -EINVAL if
 * the input is not supported or there is no active signal present in the
 * selected input.
 */
static int tvp514x_s_routing(struct v4l2_subdev *sd,
                                u32 input, u32 output, u32 config)
{
        struct tvp514x_decoder *decoder = to_decoder(sd);
        int err;
        enum tvp514x_input input_sel;
        enum tvp514x_output output_sel;
        u8 sync_lock_status, lock_mask;
        int try_count = LOCK_RETRY_COUNT;

        if ((input >= INPUT_INVALID) ||
                        (output >= OUTPUT_INVALID))
                /* Index out of bound */
                return -EINVAL;

        /*
         * For the sequence streamon -> streamoff and again s_input
         * it fails to lock the signal, since streamoff puts TVP514x
         * into power off state which leads to failure in sub-sequent s_input.
         *
         * So power up the TVP514x device here, since it is important to lock
         * the signal at this stage.
         */
        if (!decoder->streaming)
                tvp514x_s_stream(sd, 1);

        input_sel = input;
        output_sel = output;

        err = tvp514x_write_reg(sd, REG_INPUT_SEL, input_sel);
        if (err)
                return err;

        output_sel |= tvp514x_read_reg(sd,
                        REG_OUTPUT_FORMATTER1) & 0x7;
        err = tvp514x_write_reg(sd, REG_OUTPUT_FORMATTER1,
                        output_sel);
        if (err)
                return err;

        decoder->tvp514x_regs[REG_INPUT_SEL].val = input_sel;
        decoder->tvp514x_regs[REG_OUTPUT_FORMATTER1].val = output_sel;

        /* Clear status */
        msleep(LOCK_RETRY_DELAY);
        err =
            tvp514x_write_reg(sd, REG_CLEAR_LOST_LOCK, 0x01);
        if (err)
                return err;

        switch (input_sel) {
        case INPUT_CVBS_VI1A:
        case INPUT_CVBS_VI1B:
        case INPUT_CVBS_VI1C:
        case INPUT_CVBS_VI2A:
        case INPUT_CVBS_VI2B:
        case INPUT_CVBS_VI2C:
        case INPUT_CVBS_VI3A:
        case INPUT_CVBS_VI3B:
        case INPUT_CVBS_VI3C:
        case INPUT_CVBS_VI4A:
                lock_mask = STATUS_CLR_SUBCAR_LOCK_BIT |
                        STATUS_HORZ_SYNC_LOCK_BIT |
                        STATUS_VIRT_SYNC_LOCK_BIT;
                break;

        case INPUT_SVIDEO_VI2A_VI1A:
        case INPUT_SVIDEO_VI2B_VI1B:
        case INPUT_SVIDEO_VI2C_VI1C:
        case INPUT_SVIDEO_VI2A_VI3A:
        case INPUT_SVIDEO_VI2B_VI3B:
        case INPUT_SVIDEO_VI2C_VI3C:
        case INPUT_SVIDEO_VI4A_VI1A:
        case INPUT_SVIDEO_VI4A_VI1B:
        case INPUT_SVIDEO_VI4A_VI1C:
        case INPUT_SVIDEO_VI4A_VI3A:
        case INPUT_SVIDEO_VI4A_VI3B:
        case INPUT_SVIDEO_VI4A_VI3C:
                lock_mask = STATUS_HORZ_SYNC_LOCK_BIT |
                        STATUS_VIRT_SYNC_LOCK_BIT;
                break;
        /* Need to add other interfaces*/
        default:
                return -EINVAL;
        }

        while (try_count-- > 0) {
                /* Allow decoder to sync up with new input */
                msleep(LOCK_RETRY_DELAY);

                sync_lock_status = tvp514x_read_reg(sd,
                                REG_STATUS1);
                if (lock_mask == (sync_lock_status & lock_mask))
                        /* Input detected */
                        break;
        }

        if (try_count < 0)
                return -EINVAL;

        decoder->input = input;
        decoder->output = output;

        v4l2_dbg(1, debug, sd, "Input set to: %d\n", input_sel);

        return 0;
}

/**
 * tvp514x_queryctrl() - V4L2 decoder interface handler for queryctrl
 * @sd: pointer to standard V4L2 sub-device structure
 * @qctrl: standard V4L2 v4l2_queryctrl structure
 *
 * If the requested control is supported, returns the control information.
 * Otherwise, returns -EINVAL if the control is not supported.
 */
static int
tvp514x_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qctrl)
{
        int err = -EINVAL;

        if (qctrl == NULL)
                return err;

        switch (qctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                /* Brightness supported is (0-255), */
                err = v4l2_ctrl_query_fill(qctrl, 0, 255, 1, 128);
                break;
        case V4L2_CID_CONTRAST:
        case V4L2_CID_SATURATION:
                /**
                 * Saturation and Contrast supported is -
                 *      Contrast: 0 - 255 (Default - 128)
                 *      Saturation: 0 - 255 (Default - 128)
                 */
                err = v4l2_ctrl_query_fill(qctrl, 0, 255, 1, 128);
                break;
        case V4L2_CID_HUE:
                /* Hue Supported is -
                 *      Hue - -180 - +180 (Default - 0, Step - +180)
                 */
                err = v4l2_ctrl_query_fill(qctrl, -180, 180, 180, 0);
                break;
        case V4L2_CID_AUTOGAIN:
                /**
                 * Auto Gain supported is -
                 *      0 - 1 (Default - 1)
                 */
                err = v4l2_ctrl_query_fill(qctrl, 0, 1, 1, 1);
                break;
        default:
                v4l2_err(sd, "invalid control id %d\n", qctrl->id);
                return err;
        }

        v4l2_dbg(1, debug, sd, "Query Control:%s: Min - %d, Max - %d, Def - %d\n",
                        qctrl->name, qctrl->minimum, qctrl->maximum,
                        qctrl->default_value);

        return err;
}

/**
 * tvp514x_g_ctrl() - V4L2 decoder interface handler for g_ctrl
 * @sd: pointer to standard V4L2 sub-device structure
 * @ctrl: pointer to v4l2_control structure
 *
 * If the requested control is supported, returns the control's current
 * value from the decoder. Otherwise, returns -EINVAL if the control is not
 * supported.
 */
static int
tvp514x_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
        struct tvp514x_decoder *decoder = to_decoder(sd);

        if (ctrl == NULL)
                return -EINVAL;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                ctrl->value = decoder->tvp514x_regs[REG_BRIGHTNESS].val;
                break;
        case V4L2_CID_CONTRAST:
                ctrl->value = decoder->tvp514x_regs[REG_CONTRAST].val;
                break;
        case V4L2_CID_SATURATION:
                ctrl->value = decoder->tvp514x_regs[REG_SATURATION].val;
                break;
        case V4L2_CID_HUE:
                ctrl->value = decoder->tvp514x_regs[REG_HUE].val;
                if (ctrl->value == 0x7F)
                        ctrl->value = 180;
                else if (ctrl->value == 0x80)
                        ctrl->value = -180;
                else
                        ctrl->value = 0;

                break;
        case V4L2_CID_AUTOGAIN:
                ctrl->value = decoder->tvp514x_regs[REG_AFE_GAIN_CTRL].val;
                if ((ctrl->value & 0x3) == 3)
                        ctrl->value = 1;
                else
                        ctrl->value = 0;

                break;
        default:
                v4l2_err(sd, "invalid control id %d\n", ctrl->id);
                return -EINVAL;
        }

        v4l2_dbg(1, debug, sd, "Get Control: ID - %d - %d\n",
                        ctrl->id, ctrl->value);
        return 0;
}

/**
 * tvp514x_s_ctrl() - V4L2 decoder interface handler for s_ctrl
 * @sd: pointer to standard V4L2 sub-device structure
 * @ctrl: pointer to v4l2_control structure
 *
 * If the requested control is supported, sets the control's current
 * value in HW. Otherwise, returns -EINVAL if the control is not supported.
 */
static int
tvp514x_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
        struct tvp514x_decoder *decoder = to_decoder(sd);
        int err = -EINVAL, value;

        if (ctrl == NULL)
                return err;

        value = ctrl->value;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                if (ctrl->value < 0 || ctrl->value > 255) {
                        v4l2_err(sd, "invalid brightness setting %d\n",
                                        ctrl->value);
                        return -ERANGE;
                }
                err = tvp514x_write_reg(sd, REG_BRIGHTNESS,
                                value);
                if (err)
                        return err;

                decoder->tvp514x_regs[REG_BRIGHTNESS].val = value;
                break;
        case V4L2_CID_CONTRAST:
                if (ctrl->value < 0 || ctrl->value > 255) {
                        v4l2_err(sd, "invalid contrast setting %d\n",
                                        ctrl->value);
                        return -ERANGE;
                }
                err = tvp514x_write_reg(sd, REG_CONTRAST, value);
                if (err)
                        return err;

                decoder->tvp514x_regs[REG_CONTRAST].val = value;
                break;
        case V4L2_CID_SATURATION:
                if (ctrl->value < 0 || ctrl->value > 255) {
                        v4l2_err(sd, "invalid saturation setting %d\n",
                                        ctrl->value);
                        return -ERANGE;
                }
                err = tvp514x_write_reg(sd, REG_SATURATION, value);
                if (err)
                        return err;

                decoder->tvp514x_regs[REG_SATURATION].val = value;
                break;
        case V4L2_CID_HUE:
                if (value == 180)
                        value = 0x7F;
                else if (value == -180)
                        value = 0x80;
                else if (value == 0)
                        value = 0;
                else {
                        v4l2_err(sd, "invalid hue setting %d\n", ctrl->value);
                        return -ERANGE;
                }
                err = tvp514x_write_reg(sd, REG_HUE, value);
                if (err)
                        return err;

                decoder->tvp514x_regs[REG_HUE].val = value;
                break;
        case V4L2_CID_AUTOGAIN:
                if (value == 1)
                        value = 0x0F;
                else if (value == 0)
                        value = 0x0C;
                else {
                        v4l2_err(sd, "invalid auto gain setting %d\n",
                                        ctrl->value);
                        return -ERANGE;
                }
                err = tvp514x_write_reg(sd, REG_AFE_GAIN_CTRL, value);
                if (err)
                        return err;

                decoder->tvp514x_regs[REG_AFE_GAIN_CTRL].val = value;
                break;
        default:
                v4l2_err(sd, "invalid control id %d\n", ctrl->id);
                return err;
        }

        v4l2_dbg(1, debug, sd, "Set Control: ID - %d - %d\n",
                        ctrl->id, ctrl->value);

        return err;
}

/**
 * tvp514x_enum_fmt_cap() - V4L2 decoder interface handler for enum_fmt
 * @sd: pointer to standard V4L2 sub-device structure
 * @fmt: standard V4L2 VIDIOC_ENUM_FMT ioctl structure
 *
 * Implement the VIDIOC_ENUM_FMT ioctl to enumerate supported formats
 */
static int
tvp514x_enum_fmt_cap(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmt)
{
        if (fmt == NULL || fmt->index)
                return -EINVAL;

        if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                /* only capture is supported */
                return -EINVAL;

        /* only one format */
        fmt->flags = 0;
        strlcpy(fmt->description, "8-bit UYVY 4:2:2 Format",
                                        sizeof(fmt->description));
        fmt->pixelformat = V4L2_PIX_FMT_UYVY;
        return 0;
}

/**
 * tvp514x_fmt_cap() - V4L2 decoder interface handler for try/s/g_fmt
 * @sd: pointer to standard V4L2 sub-device structure
 * @f: pointer to standard V4L2 VIDIOC_TRY_FMT ioctl structure
 *
 * Implement the VIDIOC_TRY/S/G_FMT ioctl for the CAPTURE buffer type. This
 * ioctl is used to negotiate the image capture size and pixel format.
 */
static int
tvp514x_fmt_cap(struct v4l2_subdev *sd, struct v4l2_format *f)
{
        struct tvp514x_decoder *decoder = to_decoder(sd);
        struct v4l2_pix_format *pix;
        enum tvp514x_std current_std;

        if (f == NULL)
                return -EINVAL;

        if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                return -EINVAL;

        pix = &f->fmt.pix;

        /* Calculate height and width based on current standard */
        current_std = decoder->current_std;

        pix->pixelformat = V4L2_PIX_FMT_UYVY;
        pix->width = decoder->std_list[current_std].width;
        pix->height = decoder->std_list[current_std].height;
        pix->field = V4L2_FIELD_INTERLACED;
        pix->bytesperline = pix->width * 2;
        pix->sizeimage = pix->bytesperline * pix->height;
        pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
        pix->priv = 0;

        v4l2_dbg(1, debug, sd, "FMT: bytesperline - %d"
                        "Width - %d, Height - %d\n",
                        pix->bytesperline,
                        pix->width, pix->height);
        return 0;
}

/**
 * tvp514x_g_parm() - V4L2 decoder interface handler for g_parm
 * @sd: pointer to standard V4L2 sub-device structure
 * @a: pointer to standard V4L2 VIDIOC_G_PARM ioctl structure
 *
 * Returns the decoder's video CAPTURE parameters.
 */
static int
tvp514x_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *a)
{
        struct tvp514x_decoder *decoder = to_decoder(sd);
        struct v4l2_captureparm *cparm;
        enum tvp514x_std current_std;

        if (a == NULL)
                return -EINVAL;

        if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                /* only capture is supported */
                return -EINVAL;

        /* get the current standard */
        current_std = decoder->current_std;

        cparm = &a->parm.capture;
        cparm->capability = V4L2_CAP_TIMEPERFRAME;
        cparm->timeperframe =
                decoder->std_list[current_std].standard.frameperiod;

        return 0;
}

/**
 * tvp514x_s_parm() - V4L2 decoder interface handler for s_parm
 * @sd: pointer to standard V4L2 sub-device structure
 * @a: pointer to standard V4L2 VIDIOC_S_PARM ioctl structure
 *
 * Configures the decoder to use the input parameters, if possible. If
 * not possible, returns the appropriate error code.
 */
static int
tvp514x_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *a)
{
        struct tvp514x_decoder *decoder = to_decoder(sd);
        struct v4l2_fract *timeperframe;
        enum tvp514x_std current_std;

        if (a == NULL)
                return -EINVAL;

        if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                /* only capture is supported */
                return -EINVAL;

        timeperframe = &a->parm.capture.timeperframe;

        /* get the current standard */
        current_std = decoder->current_std;

        *timeperframe =
            decoder->std_list[current_std].standard.frameperiod;

        return 0;
}

/**
 * tvp514x_s_stream() - V4L2 decoder i/f handler for s_stream
 * @sd: pointer to standard V4L2 sub-device structure
 * @enable: streaming enable or disable
 *
 * Sets streaming to enable or disable, if possible.
 */
static int tvp514x_s_stream(struct v4l2_subdev *sd, int enable)
{
        int err = 0;
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct tvp514x_decoder *decoder = to_decoder(sd);

        if (decoder->streaming == enable)
                return 0;

        switch (enable) {
        case 0:
        {
                /* Power Down Sequence */
                err = tvp514x_write_reg(sd, REG_OPERATION_MODE, 0x01);
                if (err) {
                        v4l2_err(sd, "Unable to turn off decoder\n");
                        return err;
                }
                decoder->streaming = enable;
                break;
        }
        case 1:
        {
                struct tvp514x_reg *int_seq = (struct tvp514x_reg *)
                                client->driver->id_table->driver_data;

                /* Power Up Sequence */
                err = tvp514x_write_regs(sd, int_seq);
                if (err) {
                        v4l2_err(sd, "Unable to turn on decoder\n");
                        return err;
                }
                /* Detect if not already detected */
                err = tvp514x_detect(sd, decoder);
                if (err) {
                        v4l2_err(sd, "Unable to detect decoder\n");
                        return err;
                }
                err = tvp514x_configure(sd, decoder);
                if (err) {
                        v4l2_err(sd, "Unable to configure decoder\n");
                        return err;
                }
                decoder->streaming = enable;
                break;
        }
        default:
                err = -ENODEV;
                break;
        }

        return err;
}

static const struct v4l2_subdev_core_ops tvp514x_core_ops = {
        .queryctrl = tvp514x_queryctrl,
        .g_ctrl = tvp514x_g_ctrl,
        .s_ctrl = tvp514x_s_ctrl,
        .s_std = tvp514x_s_std,
};

static const struct v4l2_subdev_video_ops tvp514x_video_ops = {
        .s_routing = tvp514x_s_routing,
        .querystd = tvp514x_querystd,
        .enum_fmt = tvp514x_enum_fmt_cap,
        .g_fmt = tvp514x_fmt_cap,
        .try_fmt = tvp514x_fmt_cap,
        .s_fmt = tvp514x_fmt_cap,
        .g_parm = tvp514x_g_parm,
        .s_parm = tvp514x_s_parm,
        .s_stream = tvp514x_s_stream,
};

static const struct v4l2_subdev_ops tvp514x_ops = {
        .core = &tvp514x_core_ops,
        .video = &tvp514x_video_ops,
};

static struct tvp514x_decoder tvp514x_dev = {
        .streaming = 0,
        .current_std = STD_NTSC_MJ,
        .std_list = tvp514x_std_list,
        .num_stds = ARRAY_SIZE(tvp514x_std_list),

};

/**
 * tvp514x_probe() - decoder driver i2c probe handler
 * @client: i2c driver client device structure
 * @id: i2c driver id table
 *
 * Register decoder as an i2c client device and V4L2
 * device.
 */
static int
tvp514x_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
        struct tvp514x_decoder *decoder;
        struct v4l2_subdev *sd;

        /* Check if the adapter supports the needed features */
        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
                return -EIO;

        if (!client->dev.platform_data) {
                v4l2_err(client, "No platform data!!\n");
                return -ENODEV;
        }

        decoder = kzalloc(sizeof(*decoder), GFP_KERNEL);
        if (!decoder)
                return -ENOMEM;

        /* Initialize the tvp514x_decoder with default configuration */
        *decoder = tvp514x_dev;
        /* Copy default register configuration */
        memcpy(decoder->tvp514x_regs, tvp514x_reg_list_default,
                        sizeof(tvp514x_reg_list_default));

        /* Copy board specific information here */
        decoder->pdata = client->dev.platform_data;

        /**
         * Fetch platform specific data, and configure the
         * tvp514x_reg_list[] accordingly. Since this is one
         * time configuration, no need to preserve.
         */
        decoder->tvp514x_regs[REG_OUTPUT_FORMATTER2].val |=
                (decoder->pdata->clk_polarity << 1);
        decoder->tvp514x_regs[REG_SYNC_CONTROL].val |=
                ((decoder->pdata->hs_polarity << 2) |
                 (decoder->pdata->vs_polarity << 3));
        /* Set default standard to auto */
        decoder->tvp514x_regs[REG_VIDEO_STD].val =
                VIDEO_STD_AUTO_SWITCH_BIT;

        /* Register with V4L2 layer as slave device */
        sd = &decoder->sd;
        v4l2_i2c_subdev_init(sd, client, &tvp514x_ops);

        v4l2_info(sd, "%s decoder driver registered !!\n", sd->name);

        return 0;

}

/**
 * tvp514x_remove() - decoder driver i2c remove handler
 * @client: i2c driver client device structure
 *
 * Unregister decoder as an i2c client device and V4L2
 * device. Complement of tvp514x_probe().
 */
static int tvp514x_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct tvp514x_decoder *decoder = to_decoder(sd);

        v4l2_device_unregister_subdev(sd);
        kfree(decoder);
        return 0;
}
/* TVP5146 Init/Power on Sequence */
static const struct tvp514x_reg tvp5146_init_reg_seq[] = {
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS1, 0x02},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS2, 0x00},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS3, 0x80},
        {TOK_WRITE, REG_VBUS_DATA_ACCESS_NO_VBUS_ADDR_INCR, 0x01},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS1, 0x60},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS2, 0x00},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS3, 0xB0},
        {TOK_WRITE, REG_VBUS_DATA_ACCESS_NO_VBUS_ADDR_INCR, 0x01},
        {TOK_WRITE, REG_VBUS_DATA_ACCESS_NO_VBUS_ADDR_INCR, 0x00},
        {TOK_WRITE, REG_OPERATION_MODE, 0x01},
        {TOK_WRITE, REG_OPERATION_MODE, 0x00},
        {TOK_TERM, 0, 0},
};

/* TVP5147 Init/Power on Sequence */
static const struct tvp514x_reg tvp5147_init_reg_seq[] =        {
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS1, 0x02},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS2, 0x00},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS3, 0x80},
        {TOK_WRITE, REG_VBUS_DATA_ACCESS_NO_VBUS_ADDR_INCR, 0x01},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS1, 0x60},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS2, 0x00},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS3, 0xB0},
        {TOK_WRITE, REG_VBUS_DATA_ACCESS_NO_VBUS_ADDR_INCR, 0x01},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS1, 0x16},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS2, 0x00},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS3, 0xA0},
        {TOK_WRITE, REG_VBUS_DATA_ACCESS_NO_VBUS_ADDR_INCR, 0x16},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS1, 0x60},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS2, 0x00},
        {TOK_WRITE, REG_VBUS_ADDRESS_ACCESS3, 0xB0},
        {TOK_WRITE, REG_VBUS_DATA_ACCESS_NO_VBUS_ADDR_INCR, 0x00},
        {TOK_WRITE, REG_OPERATION_MODE, 0x01},
        {TOK_WRITE, REG_OPERATION_MODE, 0x00},
        {TOK_TERM, 0, 0},
};

/* TVP5146M2/TVP5147M1 Init/Power on Sequence */
static const struct tvp514x_reg tvp514xm_init_reg_seq[] = {
        {TOK_WRITE, REG_OPERATION_MODE, 0x01},
        {TOK_WRITE, REG_OPERATION_MODE, 0x00},
        {TOK_TERM, 0, 0},
};

/**
 * I2C Device Table -
 *
 * name - Name of the actual device/chip.
 * driver_data - Driver data
 */
static const struct i2c_device_id tvp514x_id[] = {
        {"tvp5146", (unsigned long)tvp5146_init_reg_seq},
        {"tvp5146m2", (unsigned long)tvp514xm_init_reg_seq},
        {"tvp5147", (unsigned long)tvp5147_init_reg_seq},
        {"tvp5147m1", (unsigned long)tvp514xm_init_reg_seq},
        {},
};

MODULE_DEVICE_TABLE(i2c, tvp514x_id);

static struct i2c_driver tvp514x_driver = {
        .driver = {
                .owner = THIS_MODULE,
                .name = TVP514X_MODULE_NAME,
        },
        .probe = tvp514x_probe,
        .remove = tvp514x_remove,
        .id_table = tvp514x_id,
};

static int __init tvp514x_init(void)
{
        return i2c_add_driver(&tvp514x_driver);
}

static void __exit tvp514x_exit(void)
{
        i2c_del_driver(&tvp514x_driver);
}

module_init(tvp514x_init);
module_exit(tvp514x_exit);