/*
   cx231xx_avcore.c - driver for Conexant Cx23100/101/102
                      USB video capture devices

   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>

   This program contains the specific code to control the avdecoder chip and
   other related usb control functions for cx231xx based chipset.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   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/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bitmap.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include <linux/mm.h>
#include <linux/mutex.h>

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

#include "cx231xx.h"

/******************************************************************************
                        -: BLOCK ARRANGEMENT :-
        I2S block ----------------------|
        [I2S audio]                     |
                                        |
        Analog Front End --> Direct IF -|-> Cx25840 --> Audio
        [video & audio]                 |   [Audio]
                                        |
                                        |-> Cx25840 --> Video
                                            [Video]

*******************************************************************************/

/******************************************************************************
 *                    A F E - B L O C K    C O N T R O L   functions          *
 *                              [ANALOG FRONT END]                            *
 ******************************************************************************/
static int afe_write_byte(struct cx231xx *dev, u16 saddr, u8 data)
{
        return cx231xx_write_i2c_data(dev, AFE_DEVICE_ADDRESS,
                                        saddr, 2, data, 1);
}

static int afe_read_byte(struct cx231xx *dev, u16 saddr, u8 *data)
{
        int status;
        u32 temp = 0;

        status = cx231xx_read_i2c_data(dev, AFE_DEVICE_ADDRESS,
                                        saddr, 2, &temp, 1);
        *data = (u8) temp;
        return status;
}

int cx231xx_afe_init_super_block(struct cx231xx *dev, u32 ref_count)
{
        int status = 0;
        u8 temp = 0;
        u8 afe_power_status = 0;
        int i = 0;

        /* super block initialize */
        temp = (u8) (ref_count & 0xff);
        status = afe_write_byte(dev, SUP_BLK_TUNE2, temp);
        if (status < 0)
                return status;

        status = afe_read_byte(dev, SUP_BLK_TUNE2, &afe_power_status);
        if (status < 0)
                return status;

        temp = (u8) ((ref_count & 0x300) >> 8);
        temp |= 0x40;
        status = afe_write_byte(dev, SUP_BLK_TUNE1, temp);
        if (status < 0)
                return status;

        status = afe_write_byte(dev, SUP_BLK_PLL2, 0x0f);
        if (status < 0)
                return status;

        /* enable pll     */
        while (afe_power_status != 0x18) {
                status = afe_write_byte(dev, SUP_BLK_PWRDN, 0x18);
                if (status < 0) {
                        cx231xx_info(
                        ": Init Super Block failed in send cmd\n");
                        break;
                }

                status = afe_read_byte(dev, SUP_BLK_PWRDN, &afe_power_status);
                afe_power_status &= 0xff;
                if (status < 0) {
                        cx231xx_info(
                        ": Init Super Block failed in receive cmd\n");
                        break;
                }
                i++;
                if (i == 10) {
                        cx231xx_info(
                        ": Init Super Block force break in loop !!!!\n");
                        status = -1;
                        break;
                }
        }

        if (status < 0)
                return status;

        /* start tuning filter */
        status = afe_write_byte(dev, SUP_BLK_TUNE3, 0x40);
        if (status < 0)
                return status;

        msleep(5);

        /* exit tuning */
        status = afe_write_byte(dev, SUP_BLK_TUNE3, 0x00);

        return status;
}

int cx231xx_afe_init_channels(struct cx231xx *dev)
{
        int status = 0;

        /* power up all 3 channels, clear pd_buffer */
        status = afe_write_byte(dev, ADC_PWRDN_CLAMP_CH1, 0x00);
        status = afe_write_byte(dev, ADC_PWRDN_CLAMP_CH2, 0x00);
        status = afe_write_byte(dev, ADC_PWRDN_CLAMP_CH3, 0x00);

        /* Enable quantizer calibration */
        status = afe_write_byte(dev, ADC_COM_QUANT, 0x02);

        /* channel initialize, force modulator (fb) reset */
        status = afe_write_byte(dev, ADC_FB_FRCRST_CH1, 0x17);
        status = afe_write_byte(dev, ADC_FB_FRCRST_CH2, 0x17);
        status = afe_write_byte(dev, ADC_FB_FRCRST_CH3, 0x17);

        /* start quantilizer calibration  */
        status = afe_write_byte(dev, ADC_CAL_ATEST_CH1, 0x10);
        status = afe_write_byte(dev, ADC_CAL_ATEST_CH2, 0x10);
        status = afe_write_byte(dev, ADC_CAL_ATEST_CH3, 0x10);
        msleep(5);

        /* exit modulator (fb) reset */
        status = afe_write_byte(dev, ADC_FB_FRCRST_CH1, 0x07);
        status = afe_write_byte(dev, ADC_FB_FRCRST_CH2, 0x07);
        status = afe_write_byte(dev, ADC_FB_FRCRST_CH3, 0x07);

        /* enable the pre_clamp in each channel for single-ended input */
        status = afe_write_byte(dev, ADC_NTF_PRECLMP_EN_CH1, 0xf0);
        status = afe_write_byte(dev, ADC_NTF_PRECLMP_EN_CH2, 0xf0);
        status = afe_write_byte(dev, ADC_NTF_PRECLMP_EN_CH3, 0xf0);

        /* use diode instead of resistor, so set term_en to 0, res_en to 0  */
        status = cx231xx_reg_mask_write(dev, AFE_DEVICE_ADDRESS, 8,
                                   ADC_QGAIN_RES_TRM_CH1, 3, 7, 0x00);
        status = cx231xx_reg_mask_write(dev, AFE_DEVICE_ADDRESS, 8,
                                   ADC_QGAIN_RES_TRM_CH2, 3, 7, 0x00);
        status = cx231xx_reg_mask_write(dev, AFE_DEVICE_ADDRESS, 8,
                                   ADC_QGAIN_RES_TRM_CH3, 3, 7, 0x00);

        /* dynamic element matching off */
        status = afe_write_byte(dev, ADC_DCSERVO_DEM_CH1, 0x03);
        status = afe_write_byte(dev, ADC_DCSERVO_DEM_CH2, 0x03);
        status = afe_write_byte(dev, ADC_DCSERVO_DEM_CH3, 0x03);

        return status;
}

int cx231xx_afe_setup_AFE_for_baseband(struct cx231xx *dev)
{
        u8 c_value = 0;
        int status = 0;

        status = afe_read_byte(dev, ADC_PWRDN_CLAMP_CH2, &c_value);
        c_value &= (~(0x50));
        status = afe_write_byte(dev, ADC_PWRDN_CLAMP_CH2, c_value);

        return status;
}

/*
        The Analog Front End in Cx231xx has 3 channels. These
        channels are used to share between different inputs
        like tuner, s-video and composite inputs.

        channel 1 ----- pin 1  to pin4(in reg is 1-4)
        channel 2 ----- pin 5  to pin8(in reg is 5-8)
        channel 3 ----- pin 9 to pin 12(in reg is 9-11)
*/
int cx231xx_afe_set_input_mux(struct cx231xx *dev, u32 input_mux)
{
        u8 ch1_setting = (u8) input_mux;
        u8 ch2_setting = (u8) (input_mux >> 8);
        u8 ch3_setting = (u8) (input_mux >> 16);
        int status = 0;
        u8 value = 0;

        if (ch1_setting != 0) {
                status = afe_read_byte(dev, ADC_INPUT_CH1, &value);
                value &= (!INPUT_SEL_MASK);
                value |= (ch1_setting - 1) << 4;
                value &= 0xff;
                status = afe_write_byte(dev, ADC_INPUT_CH1, value);
        }

        if (ch2_setting != 0) {
                status = afe_read_byte(dev, ADC_INPUT_CH2, &value);
                value &= (!INPUT_SEL_MASK);
                value |= (ch2_setting - 1) << 4;
                value &= 0xff;
                status = afe_write_byte(dev, ADC_INPUT_CH2, value);
        }

        /* For ch3_setting, the value to put in the register is
           7 less than the input number */
        if (ch3_setting != 0) {
                status = afe_read_byte(dev, ADC_INPUT_CH3, &value);
                value &= (!INPUT_SEL_MASK);
                value |= (ch3_setting - 1) << 4;
                value &= 0xff;
                status = afe_write_byte(dev, ADC_INPUT_CH3, value);
        }

        return status;
}

int cx231xx_afe_set_mode(struct cx231xx *dev, enum AFE_MODE mode)
{
        int status = 0;

        /*
        * FIXME: We need to implement the AFE code for LOW IF and for HI IF.
        * Currently, only baseband works.
        */

        switch (mode) {
        case AFE_MODE_LOW_IF:
                /* SetupAFEforLowIF();  */
                break;
        case AFE_MODE_BASEBAND:
                status = cx231xx_afe_setup_AFE_for_baseband(dev);
                break;
        case AFE_MODE_EU_HI_IF:
                /* SetupAFEforEuHiIF(); */
                break;
        case AFE_MODE_US_HI_IF:
                /* SetupAFEforUsHiIF(); */
                break;
        case AFE_MODE_JAPAN_HI_IF:
                /* SetupAFEforJapanHiIF(); */
                break;
        }

        if ((mode != dev->afe_mode) &&
                (dev->video_input == CX231XX_VMUX_TELEVISION))
                status = cx231xx_afe_adjust_ref_count(dev,
                                                     CX231XX_VMUX_TELEVISION);

        dev->afe_mode = mode;

        return status;
}

int cx231xx_afe_update_power_control(struct cx231xx *dev,
                                        enum AV_MODE avmode)
{
        u8 afe_power_status = 0;
        int status = 0;

        switch (dev->model) {
        case CX231XX_BOARD_CNXT_RDE_250:
        case CX231XX_BOARD_CNXT_RDU_250:
                if (avmode == POLARIS_AVMODE_ANALOGT_TV) {
                        while (afe_power_status != (FLD_PWRDN_TUNING_BIAS |
                                                FLD_PWRDN_ENABLE_PLL)) {
                                status = afe_write_byte(dev, SUP_BLK_PWRDN,
                                                        FLD_PWRDN_TUNING_BIAS |
                                                        FLD_PWRDN_ENABLE_PLL);
                                status |= afe_read_byte(dev, SUP_BLK_PWRDN,
                                                        &afe_power_status);
                                if (status < 0)
                                        break;
                        }

                        status = afe_write_byte(dev, ADC_PWRDN_CLAMP_CH1,
                                                        0x00);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH2,
                                                        0x00);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH3,
                                                        0x00);
                } else if (avmode == POLARIS_AVMODE_DIGITAL) {
                        status = afe_write_byte(dev, ADC_PWRDN_CLAMP_CH1,
                                                        0x70);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH2,
                                                        0x70);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH3,
                                                        0x70);

                        status |= afe_read_byte(dev, SUP_BLK_PWRDN,
                                                  &afe_power_status);
                        afe_power_status |= FLD_PWRDN_PD_BANDGAP |
                                                FLD_PWRDN_PD_BIAS |
                                                FLD_PWRDN_PD_TUNECK;
                        status |= afe_write_byte(dev, SUP_BLK_PWRDN,
                                                   afe_power_status);
                } else if (avmode == POLARIS_AVMODE_ENXTERNAL_AV) {
                        while (afe_power_status != (FLD_PWRDN_TUNING_BIAS |
                                                FLD_PWRDN_ENABLE_PLL)) {
                                status = afe_write_byte(dev, SUP_BLK_PWRDN,
                                                        FLD_PWRDN_TUNING_BIAS |
                                                        FLD_PWRDN_ENABLE_PLL);
                                status |= afe_read_byte(dev, SUP_BLK_PWRDN,
                                                        &afe_power_status);
                                if (status < 0)
                                        break;
                        }

                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH1,
                                                0x00);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH2,
                                                0x00);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH3,
                                                0x00);
                } else {
                        cx231xx_info("Invalid AV mode input\n");
                        status = -1;
                }
                break;
        default:
                if (avmode == POLARIS_AVMODE_ANALOGT_TV) {
                        while (afe_power_status != (FLD_PWRDN_TUNING_BIAS |
                                                FLD_PWRDN_ENABLE_PLL)) {
                                status = afe_write_byte(dev, SUP_BLK_PWRDN,
                                                        FLD_PWRDN_TUNING_BIAS |
                                                        FLD_PWRDN_ENABLE_PLL);
                                status |= afe_read_byte(dev, SUP_BLK_PWRDN,
                                                        &afe_power_status);
                                if (status < 0)
                                        break;
                        }

                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH1,
                                                        0x40);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH2,
                                                        0x40);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH3,
                                                        0x00);
                } else if (avmode == POLARIS_AVMODE_DIGITAL) {
                        status = afe_write_byte(dev, ADC_PWRDN_CLAMP_CH1,
                                                        0x70);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH2,
                                                        0x70);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH3,
                                                        0x70);

                        status |= afe_read_byte(dev, SUP_BLK_PWRDN,
                                                       &afe_power_status);
                        afe_power_status |= FLD_PWRDN_PD_BANDGAP |
                                                FLD_PWRDN_PD_BIAS |
                                                FLD_PWRDN_PD_TUNECK;
                        status |= afe_write_byte(dev, SUP_BLK_PWRDN,
                                                        afe_power_status);
                } else if (avmode == POLARIS_AVMODE_ENXTERNAL_AV) {
                        while (afe_power_status != (FLD_PWRDN_TUNING_BIAS |
                                                FLD_PWRDN_ENABLE_PLL)) {
                                status = afe_write_byte(dev, SUP_BLK_PWRDN,
                                                        FLD_PWRDN_TUNING_BIAS |
                                                        FLD_PWRDN_ENABLE_PLL);
                                status |= afe_read_byte(dev, SUP_BLK_PWRDN,
                                                        &afe_power_status);
                                if (status < 0)
                                        break;
                        }

                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH1,
                                                        0x00);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH2,
                                                        0x00);
                        status |= afe_write_byte(dev, ADC_PWRDN_CLAMP_CH3,
                                                        0x40);
                } else {
                        cx231xx_info("Invalid AV mode input\n");
                        status = -1;
                }
        }                       /* switch  */

        return status;
}

int cx231xx_afe_adjust_ref_count(struct cx231xx *dev, u32 video_input)
{
        u8 input_mode = 0;
        u8 ntf_mode = 0;
        int status = 0;

        dev->video_input = video_input;

        if (video_input == CX231XX_VMUX_TELEVISION) {
                status = afe_read_byte(dev, ADC_INPUT_CH3, &input_mode);
                status = afe_read_byte(dev, ADC_NTF_PRECLMP_EN_CH3,
                                        &ntf_mode);
        } else {
                status = afe_read_byte(dev, ADC_INPUT_CH1, &input_mode);
                status = afe_read_byte(dev, ADC_NTF_PRECLMP_EN_CH1,
                                        &ntf_mode);
        }

        input_mode = (ntf_mode & 0x3) | ((input_mode & 0x6) << 1);

        switch (input_mode) {
        case SINGLE_ENDED:
                dev->afe_ref_count = 0x23C;
                break;
        case LOW_IF:
                dev->afe_ref_count = 0x24C;
                break;
        case EU_IF:
                dev->afe_ref_count = 0x258;
                break;
        case US_IF:
                dev->afe_ref_count = 0x260;
                break;
        default:
                break;
        }

        status = cx231xx_afe_init_super_block(dev, dev->afe_ref_count);

        return status;
}

/******************************************************************************
 *     V I D E O / A U D I O    D E C O D E R    C O N T R O L   functions    *
 ******************************************************************************/
static int vid_blk_write_byte(struct cx231xx *dev, u16 saddr, u8 data)
{
        return cx231xx_write_i2c_data(dev, VID_BLK_I2C_ADDRESS,
                                        saddr, 2, data, 1);
}

static int vid_blk_read_byte(struct cx231xx *dev, u16 saddr, u8 *data)
{
        int status;
        u32 temp = 0;

        status = cx231xx_read_i2c_data(dev, VID_BLK_I2C_ADDRESS,
                                        saddr, 2, &temp, 1);
        *data = (u8) temp;
        return status;
}

static int vid_blk_write_word(struct cx231xx *dev, u16 saddr, u32 data)
{
        return cx231xx_write_i2c_data(dev, VID_BLK_I2C_ADDRESS,
                                        saddr, 2, data, 4);
}

static int vid_blk_read_word(struct cx231xx *dev, u16 saddr, u32 *data)
{
        return cx231xx_read_i2c_data(dev, VID_BLK_I2C_ADDRESS,
                                        saddr, 2, data, 4);
}

int cx231xx_set_video_input_mux(struct cx231xx *dev, u8 input)
{
        int status = 0;

        switch (INPUT(input)->type) {
        case CX231XX_VMUX_COMPOSITE1:
        case CX231XX_VMUX_SVIDEO:
                if ((dev->current_pcb_config.type == USB_BUS_POWER) &&
                    (dev->power_mode != POLARIS_AVMODE_ENXTERNAL_AV)) {
                        /* External AV */
                        status = cx231xx_set_power_mode(dev,
                                        POLARIS_AVMODE_ENXTERNAL_AV);
                        if (status < 0) {
                                cx231xx_errdev("%s: set_power_mode : Failed to"
                                                " set Power - errCode [%d]!\n",
                                                __func__, status);
                                return status;
                        }
                }
                status = cx231xx_set_decoder_video_input(dev,
                                                         INPUT(input)->type,
                                                         INPUT(input)->vmux);
                break;
        case CX231XX_VMUX_TELEVISION:
        case CX231XX_VMUX_CABLE:
                if ((dev->current_pcb_config.type == USB_BUS_POWER) &&
                    (dev->power_mode != POLARIS_AVMODE_ANALOGT_TV)) {
                        /* Tuner */
                        status = cx231xx_set_power_mode(dev,
                                                POLARIS_AVMODE_ANALOGT_TV);
                        if (status < 0) {
                                cx231xx_errdev("%s: set_power_mode:Failed"
                                        " to set Power - errCode [%d]!\n",
                                        __func__, status);
                                return status;
                        }
                }
                status = cx231xx_set_decoder_video_input(dev,
                                                        CX231XX_VMUX_COMPOSITE1,
                                                        INPUT(input)->vmux);
                break;
        default:
                cx231xx_errdev("%s: set_power_mode : Unknown Input %d !\n",
                     __func__, INPUT(input)->type);
                break;
        }

        /* save the selection */
        dev->video_input = input;

        return status;
}

int cx231xx_set_decoder_video_input(struct cx231xx *dev,
                                u8 pin_type, u8 input)
{
        int status = 0;
        u32 value = 0;

        if (pin_type != dev->video_input) {
                status = cx231xx_afe_adjust_ref_count(dev, pin_type);
                if (status < 0) {
                        cx231xx_errdev("%s: adjust_ref_count :Failed to set"
                                "AFE input mux - errCode [%d]!\n",
                                __func__, status);
                        return status;
                }
        }

        /* call afe block to set video inputs */
        status = cx231xx_afe_set_input_mux(dev, input);
        if (status < 0) {
                cx231xx_errdev("%s: set_input_mux :Failed to set"
                                " AFE input mux - errCode [%d]!\n",
                                __func__, status);
                return status;
        }

        switch (pin_type) {
        case CX231XX_VMUX_COMPOSITE1:
                status = vid_blk_read_word(dev, AFE_CTRL, &value);
                value |= (0 << 13) | (1 << 4);
                value &= ~(1 << 5);

                /* set [24:23] [22:15] to 0  */
                value &= (~(0x1ff8000));
                /* set FUNC_MODE[24:23] = 2 IF_MOD[22:15] = 0  */
                value |= 0x1000000;
                status = vid_blk_write_word(dev, AFE_CTRL, value);

                status = vid_blk_read_word(dev, OUT_CTRL1, &value);
                value |= (1 << 7);
                status = vid_blk_write_word(dev, OUT_CTRL1, value);

                /* Set vip 1.1 output mode */
                status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        OUT_CTRL1,
                                                        FLD_OUT_MODE,
                                                        OUT_MODE_VIP11);

                /* Tell DIF object to go to baseband mode  */
                status = cx231xx_dif_set_standard(dev, DIF_USE_BASEBAND);
                if (status < 0) {
                        cx231xx_errdev("%s: cx231xx_dif set to By pass"
                                                   " mode- errCode [%d]!\n",
                                __func__, status);
                        return status;
                }

                /* Read the DFE_CTRL1 register */
                status = vid_blk_read_word(dev, DFE_CTRL1, &value);

                /* enable the VBI_GATE_EN */
                value |= FLD_VBI_GATE_EN;

                /* Enable the auto-VGA enable */
                value |= FLD_VGA_AUTO_EN;

                /* Write it back */
                status = vid_blk_write_word(dev, DFE_CTRL1, value);

                /* Disable auto config of registers */
                status = cx231xx_read_modify_write_i2c_dword(dev,
                                        VID_BLK_I2C_ADDRESS,
                                        MODE_CTRL, FLD_ACFG_DIS,
                                        cx231xx_set_field(FLD_ACFG_DIS, 1));

                /* Set CVBS input mode */
                status = cx231xx_read_modify_write_i2c_dword(dev,
                        VID_BLK_I2C_ADDRESS,
                        MODE_CTRL, FLD_INPUT_MODE,
                        cx231xx_set_field(FLD_INPUT_MODE, INPUT_MODE_CVBS_0));
                break;
        case CX231XX_VMUX_SVIDEO:
                /* Disable the use of  DIF */

                status = vid_blk_read_word(dev, AFE_CTRL, &value);

                /* set [24:23] [22:15] to 0 */
                value &= (~(0x1ff8000));
                /* set FUNC_MODE[24:23] = 2
                IF_MOD[22:15] = 0 DCR_BYP_CH2[4:4] = 1; */
                value |= 0x1000010;
                status = vid_blk_write_word(dev, AFE_CTRL, value);

                /* Tell DIF object to go to baseband mode */
                status = cx231xx_dif_set_standard(dev, DIF_USE_BASEBAND);
                if (status < 0) {
                        cx231xx_errdev("%s: cx231xx_dif set to By pass"
                                                   " mode- errCode [%d]!\n",
                                __func__, status);
                        return status;
                }

                /* Read the DFE_CTRL1 register */
                status = vid_blk_read_word(dev, DFE_CTRL1, &value);

                /* enable the VBI_GATE_EN */
                value |= FLD_VBI_GATE_EN;

                /* Enable the auto-VGA enable */
                value |= FLD_VGA_AUTO_EN;

                /* Write it back */
                status = vid_blk_write_word(dev, DFE_CTRL1, value);

                /* Disable auto config of registers  */
                status =  cx231xx_read_modify_write_i2c_dword(dev,
                                        VID_BLK_I2C_ADDRESS,
                                        MODE_CTRL, FLD_ACFG_DIS,
                                        cx231xx_set_field(FLD_ACFG_DIS, 1));

                /* Set YC input mode */
                status = cx231xx_read_modify_write_i2c_dword(dev,
                        VID_BLK_I2C_ADDRESS,
                        MODE_CTRL,
                        FLD_INPUT_MODE,
                        cx231xx_set_field(FLD_INPUT_MODE, INPUT_MODE_YC_1));

                /* Chroma to ADC2 */
                status = vid_blk_read_word(dev, AFE_CTRL, &value);
                value |= FLD_CHROMA_IN_SEL;     /* set the chroma in select */

                /* Clear VGA_SEL_CH2 and VGA_SEL_CH3 (bits 7 and 8)
                   This sets them to use video
                   rather than audio.  Only one of the two will be in use. */
                value &= ~(FLD_VGA_SEL_CH2 | FLD_VGA_SEL_CH3);

                status = vid_blk_write_word(dev, AFE_CTRL, value);

                status = cx231xx_afe_set_mode(dev, AFE_MODE_BASEBAND);
                break;
        case CX231XX_VMUX_TELEVISION:
        case CX231XX_VMUX_CABLE:
        default:
                switch (dev->model) {
                case CX231XX_BOARD_CNXT_RDE_250:
                case CX231XX_BOARD_CNXT_RDU_250:
                        /* Disable the use of  DIF   */

                        status = vid_blk_read_word(dev, AFE_CTRL, &value);
                        value |= (0 << 13) | (1 << 4);
                        value &= ~(1 << 5);

                        /* set [24:23] [22:15] to 0 */
                        value &= (~(0x1FF8000));
                        /* set FUNC_MODE[24:23] = 2 IF_MOD[22:15] = 0 */
                        value |= 0x1000000;
                        status = vid_blk_write_word(dev, AFE_CTRL, value);

                        status = vid_blk_read_word(dev, OUT_CTRL1, &value);
                        value |= (1 << 7);
                        status = vid_blk_write_word(dev, OUT_CTRL1, value);

                        /* Set vip 1.1 output mode */
                        status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        OUT_CTRL1, FLD_OUT_MODE,
                                                        OUT_MODE_VIP11);

                        /* Tell DIF object to go to baseband mode */
                        status = cx231xx_dif_set_standard(dev,
                                                          DIF_USE_BASEBAND);
                        if (status < 0) {
                                cx231xx_errdev("%s: cx231xx_dif set to By pass"
                                                " mode- errCode [%d]!\n",
                                                __func__, status);
                                return status;
                        }

                        /* Read the DFE_CTRL1 register */
                        status = vid_blk_read_word(dev, DFE_CTRL1, &value);

                        /* enable the VBI_GATE_EN */
                        value |= FLD_VBI_GATE_EN;

                        /* Enable the auto-VGA enable */
                        value |= FLD_VGA_AUTO_EN;

                        /* Write it back */
                        status = vid_blk_write_word(dev, DFE_CTRL1, value);

                        /* Disable auto config of registers */
                        status = cx231xx_read_modify_write_i2c_dword(dev,
                                        VID_BLK_I2C_ADDRESS,
                                        MODE_CTRL, FLD_ACFG_DIS,
                                        cx231xx_set_field(FLD_ACFG_DIS, 1));

                        /* Set CVBS input mode */
                        status = cx231xx_read_modify_write_i2c_dword(dev,
                                VID_BLK_I2C_ADDRESS,
                                MODE_CTRL, FLD_INPUT_MODE,
                                cx231xx_set_field(FLD_INPUT_MODE,
                                                INPUT_MODE_CVBS_0));
                        break;
                default:
                        /* Enable the DIF for the tuner */

                        /* Reinitialize the DIF */
                        status = cx231xx_dif_set_standard(dev, dev->norm);
                        if (status < 0) {
                                cx231xx_errdev("%s: cx231xx_dif set to By pass"
                                                " mode- errCode [%d]!\n",
                                                __func__, status);
                                return status;
                        }

                        /* Make sure bypass is cleared */
                        status = vid_blk_read_word(dev, DIF_MISC_CTRL, &value);

                        /* Clear the bypass bit */
                        value &= ~FLD_DIF_DIF_BYPASS;

                        /* Enable the use of the DIF block */
                        status = vid_blk_write_word(dev, DIF_MISC_CTRL, value);

                        /* Read the DFE_CTRL1 register */
                        status = vid_blk_read_word(dev, DFE_CTRL1, &value);

                        /* Disable the VBI_GATE_EN */
                        value &= ~FLD_VBI_GATE_EN;

                        /* Enable the auto-VGA enable, AGC, and
                           set the skip count to 2 */
                        value |= FLD_VGA_AUTO_EN | FLD_AGC_AUTO_EN | 0x00200000;

                        /* Write it back */
                        status = vid_blk_write_word(dev, DFE_CTRL1, value);

                        /* Wait until AGC locks up */
                        msleep(1);

                        /* Disable the auto-VGA enable AGC */
                        value &= ~(FLD_VGA_AUTO_EN);

                        /* Write it back */
                        status = vid_blk_write_word(dev, DFE_CTRL1, value);

                        /* Enable Polaris B0 AGC output */
                        status = vid_blk_read_word(dev, PIN_CTRL, &value);
                        value |= (FLD_OEF_AGC_RF) |
                                 (FLD_OEF_AGC_IFVGA) |
                                 (FLD_OEF_AGC_IF);
                        status = vid_blk_write_word(dev, PIN_CTRL, value);

                        /* Set vip 1.1 output mode */
                        status = cx231xx_read_modify_write_i2c_dword(dev,
                                                VID_BLK_I2C_ADDRESS,
                                                OUT_CTRL1, FLD_OUT_MODE,
                                                OUT_MODE_VIP11);

                        /* Disable auto config of registers */
                        status = cx231xx_read_modify_write_i2c_dword(dev,
                                        VID_BLK_I2C_ADDRESS,
                                        MODE_CTRL, FLD_ACFG_DIS,
                                        cx231xx_set_field(FLD_ACFG_DIS, 1));

                        /* Set CVBS input mode */
                        status = cx231xx_read_modify_write_i2c_dword(dev,
                                VID_BLK_I2C_ADDRESS,
                                MODE_CTRL, FLD_INPUT_MODE,
                                cx231xx_set_field(FLD_INPUT_MODE,
                                                INPUT_MODE_CVBS_0));

                        /* Set some bits in AFE_CTRL so that channel 2 or 3
                         * is ready to receive audio */
                        /* Clear clamp for channels 2 and 3      (bit 16-17) */
                        /* Clear droop comp                      (bit 19-20) */
                        /* Set VGA_SEL (for audio control)       (bit 7-8) */
                        status = vid_blk_read_word(dev, AFE_CTRL, &value);

                        value |= FLD_VGA_SEL_CH3 | FLD_VGA_SEL_CH2;

                        status = vid_blk_write_word(dev, AFE_CTRL, value);
                        break;

                }
                break;
        }

        /* Set raw VBI mode */
        status = cx231xx_read_modify_write_i2c_dword(dev,
                                VID_BLK_I2C_ADDRESS,
                                OUT_CTRL1, FLD_VBIHACTRAW_EN,
                                cx231xx_set_field(FLD_VBIHACTRAW_EN, 1));

        status = vid_blk_read_word(dev, OUT_CTRL1, &value);
        if (value & 0x02) {
                value |= (1 << 19);
                status = vid_blk_write_word(dev, OUT_CTRL1, value);
        }

        return status;
}

/*
 * Handle any video-mode specific overrides that are different
 * on a per video standards basis after touching the MODE_CTRL
 * register which resets many values for autodetect
 */
int cx231xx_do_mode_ctrl_overrides(struct cx231xx *dev)
{
        int status = 0;

        cx231xx_info("do_mode_ctrl_overrides : 0x%x\n",
                     (unsigned int)dev->norm);

        /* Change the DFE_CTRL3 bp_percent to fix flagging */
        status = vid_blk_write_word(dev, DFE_CTRL3, 0xCD3F0280);

        if (dev->norm & (V4L2_STD_NTSC | V4L2_STD_PAL_M)) {
                cx231xx_info("do_mode_ctrl_overrides NTSC\n");

                /* Move the close caption lines out of active video,
                   adjust the active video start point */
                status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        VERT_TIM_CTRL,
                                                        FLD_VBLANK_CNT, 0x18);
                status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        VERT_TIM_CTRL,
                                                        FLD_VACTIVE_CNT,
                                                        0x1E6000);
                status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        VERT_TIM_CTRL,
                                                        FLD_V656BLANK_CNT,
                                                        0x1E000000);

                status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        HORIZ_TIM_CTRL,
                                                        FLD_HBLANK_CNT,
                                                        cx231xx_set_field
                                                        (FLD_HBLANK_CNT, 0x79));
        } else if (dev->norm & V4L2_STD_SECAM) {
                cx231xx_info("do_mode_ctrl_overrides SECAM\n");
                status =  cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        VERT_TIM_CTRL,
                                                        FLD_VBLANK_CNT, 0x24);
                /* Adjust the active video horizontal start point */
                status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        HORIZ_TIM_CTRL,
                                                        FLD_HBLANK_CNT,
                                                        cx231xx_set_field
                                                        (FLD_HBLANK_CNT, 0x85));
        } else {
                cx231xx_info("do_mode_ctrl_overrides PAL\n");
                status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        VERT_TIM_CTRL,
                                                        FLD_VBLANK_CNT, 0x24);
                /* Adjust the active video horizontal start point */
                status = cx231xx_read_modify_write_i2c_dword(dev,
                                                        VID_BLK_I2C_ADDRESS,
                                                        HORIZ_TIM_CTRL,
                                                        FLD_HBLANK_CNT,
                                                        cx231xx_set_field
                                                        (FLD_HBLANK_CNT, 0x85));
        }

        return status;
}

int cx231xx_set_audio_input(struct cx231xx *dev, u8 input)
{
        int status = 0;
        enum AUDIO_INPUT ainput = AUDIO_INPUT_LINE;

        switch (INPUT(input)->amux) {
        case CX231XX_AMUX_VIDEO:
                ainput = AUDIO_INPUT_TUNER_TV;
                break;
        case CX231XX_AMUX_LINE_IN:
                status = cx231xx_i2s_blk_set_audio_input(dev, input);
                ainput = AUDIO_INPUT_LINE;
                break;
        default:
                break;
        }

        status = cx231xx_set_audio_decoder_input(dev, ainput);

        return status;
}

int cx231xx_set_audio_decoder_input(struct cx231xx *dev,
                                    enum AUDIO_INPUT audio_input)
{
        u32 dwval;
        int status;
        u8 gen_ctrl;
        u32 value = 0;

        /* Put it in soft reset   */
        status = vid_blk_read_byte(dev, GENERAL_CTL, &gen_ctrl);
        gen_ctrl |= 1;
        status = vid_blk_write_byte(dev, GENERAL_CTL, gen_ctrl);

        switch (audio_input) {
        case AUDIO_INPUT_LINE:
                /* setup AUD_IO control from Merlin paralle output */
                value = cx231xx_set_field(FLD_AUD_CHAN1_SRC,
                                          AUD_CHAN_SRC_PARALLEL);
                status = vid_blk_write_word(dev, AUD_IO_CTRL, value);

                /* setup input to Merlin, SRC2 connect to AC97
                   bypass upsample-by-2, slave mode, sony mode, left justify
                   adr 091c, dat 01000000 */
                status = vid_blk_read_word(dev, AC97_CTL, &dwval);

                status = vid_blk_write_word(dev, AC97_CTL,
                                           (dwval | FLD_AC97_UP2X_BYPASS));

                /* select the parallel1 and SRC3 */
                status = vid_blk_write_word(dev, BAND_OUT_SEL,
                                cx231xx_set_field(FLD_SRC3_IN_SEL, 0x0) |
                                cx231xx_set_field(FLD_SRC3_CLK_SEL, 0x0) |
                                cx231xx_set_field(FLD_PARALLEL1_SRC_SEL, 0x0));

                /* unmute all, AC97 in, independence mode
                   adr 08d0, data 0x00063073 */
                status = vid_blk_write_word(dev, PATH1_CTL1, 0x00063073);

                /* set AVC maximum threshold, adr 08d4, dat ffff0024 */
                status = vid_blk_read_word(dev, PATH1_VOL_CTL, &dwval);
                status = vid_blk_write_word(dev, PATH1_VOL_CTL,
                                           (dwval | FLD_PATH1_AVC_THRESHOLD));

                /* set SC maximum threshold, adr 08ec, dat ffffb3a3 */
                status = vid_blk_read_word(dev, PATH1_SC_CTL, &dwval);
                status = vid_blk_write_word(dev, PATH1_SC_CTL,
                                           (dwval | FLD_PATH1_SC_THRESHOLD));
                break;

        case AUDIO_INPUT_TUNER_TV:
        default:

                /* Setup SRC sources and clocks */
                status = vid_blk_write_word(dev, BAND_OUT_SEL,
                        cx231xx_set_field(FLD_SRC6_IN_SEL, 0x00)         |
                        cx231xx_set_field(FLD_SRC6_CLK_SEL, 0x01)        |
                        cx231xx_set_field(FLD_SRC5_IN_SEL, 0x00)         |
                        cx231xx_set_field(FLD_SRC5_CLK_SEL, 0x02)        |
                        cx231xx_set_field(FLD_SRC4_IN_SEL, 0x02)         |
                        cx231xx_set_field(FLD_SRC4_CLK_SEL, 0x03)        |
                        cx231xx_set_field(FLD_SRC3_IN_SEL, 0x00)         |
                        cx231xx_set_field(FLD_SRC3_CLK_SEL, 0x00)        |
                        cx231xx_set_field(FLD_BASEBAND_BYPASS_CTL, 0x00) |
                        cx231xx_set_field(FLD_AC97_SRC_SEL, 0x03)        |

                        cx231xx_set_field(FLD_I2S_SRC_SEL, 0x00)         |
                        cx231xx_set_field(FLD_PARALLEL2_SRC_SEL, 0x02)   |
                        cx231xx_set_field(FLD_PARALLEL1_SRC_SEL, 0x01));

                /* Setup the AUD_IO control */
                status = vid_blk_write_word(dev, AUD_IO_CTRL,
                        cx231xx_set_field(FLD_I2S_PORT_DIR, 0x00)  |
                        cx231xx_set_field(FLD_I2S_OUT_SRC, 0x00)   |
                        cx231xx_set_field(FLD_AUD_CHAN3_SRC, 0x00) |
                        cx231xx_set_field(FLD_AUD_CHAN2_SRC, 0x00) |
                        cx231xx_set_field(FLD_AUD_CHAN1_SRC, 0x03));

                status = vid_blk_write_word(dev, PATH1_CTL1, 0x1F063870);

                /* setAudioStandard(_audio_standard); */

                status = vid_blk_write_word(dev, PATH1_CTL1, 0x00063870);
                switch (dev->model) {
                case CX231XX_BOARD_CNXT_RDE_250:
                case CX231XX_BOARD_CNXT_RDU_250:
                        status = cx231xx_read_modify_write_i2c_dword(dev,
                                        VID_BLK_I2C_ADDRESS,
                                        CHIP_CTRL,
                                        FLD_SIF_EN,
                                        cx231xx_set_field(FLD_SIF_EN, 1));
                        break;
                default:
                        break;
                }
                break;

        case AUDIO_INPUT_TUNER_FM:
                /*  use SIF for FM radio
                   setupFM();
                   setAudioStandard(_audio_standard);
                 */
                break;

        case AUDIO_INPUT_MUTE:
                status = vid_blk_write_word(dev, PATH1_CTL1, 0x1F011012);
                break;
        }

        /* Take it out of soft reset */
        status = vid_blk_read_byte(dev, GENERAL_CTL, &gen_ctrl);
        gen_ctrl &= ~1;
        status = vid_blk_write_byte(dev, GENERAL_CTL, gen_ctrl);

        return status;
}

/* Set resolution of the video */
int cx231xx_resolution_set(struct cx231xx *dev)
{
        /* set horzontal scale */
        int status = vid_blk_write_word(dev, HSCALE_CTRL, dev->hscale);
        if (status)
                return status;

        /* set vertical scale */
        return vid_blk_write_word(dev, VSCALE_CTRL, dev->vscale);
}

/******************************************************************************
 *                    C H I P Specific  C O N T R O L   functions             *
 ******************************************************************************/
int cx231xx_init_ctrl_pin_status(struct cx231xx *dev)
{
        u32 value;
        int status = 0;

        status = vid_blk_read_word(dev, PIN_CTRL, &value);
        value |= (~dev->board.ctl_pin_status_mask);
        status = vid_blk_write_word(dev, PIN_CTRL, value);

        return status;
}

int cx231xx_set_agc_analog_digital_mux_select(struct cx231xx *dev,
                                              u8 analog_or_digital)
{
        int status = 0;

        /* first set the direction to output */
        status = cx231xx_set_gpio_direction(dev,
                                            dev->board.
                                            agc_analog_digital_select_gpio, 1);

        /* 0 - demod ; 1 - Analog mode */
        status = cx231xx_set_gpio_value(dev,
                                   dev->board.agc_analog_digital_select_gpio,
                                   analog_or_digital);

        return status;
}

int cx231xx_enable_i2c_for_tuner(struct cx231xx *dev, u8 I2CIndex)
{
        u8 value[4] = { 0, 0, 0, 0 };
        int status = 0;

        cx231xx_info("Changing the i2c port for tuner to %d\n", I2CIndex);

        status = cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER,
                                       PWR_CTL_EN, value, 4);
        if (status < 0)
                return status;

        if (I2CIndex == I2C_1) {
                if (value[0] & I2C_DEMOD_EN) {
                        value[0] &= ~I2C_DEMOD_EN;
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                   PWR_CTL_EN, value, 4);
                }
        } else {
                if (!(value[0] & I2C_DEMOD_EN)) {
                        value[0] |= I2C_DEMOD_EN;
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                   PWR_CTL_EN, value, 4);
                }
        }

        return status;

}

/******************************************************************************
 *                 D I F - B L O C K    C O N T R O L   functions             *
 ******************************************************************************/
int cx231xx_dif_configure_C2HH_for_low_IF(struct cx231xx *dev, u32 mode,
                                          u32 function_mode, u32 standard)
{
        int status = 0;

        if (mode == V4L2_TUNER_RADIO) {
                /* C2HH */
                /* lo if big signal */
                status = cx231xx_reg_mask_write(dev,
                                VID_BLK_I2C_ADDRESS, 32,
                                AFE_CTRL_C2HH_SRC_CTRL, 30, 31, 0x1);
                /* FUNC_MODE = DIF */
                status = cx231xx_reg_mask_write(dev,
                                VID_BLK_I2C_ADDRESS, 32,
                                AFE_CTRL_C2HH_SRC_CTRL, 23, 24, function_mode);
                /* IF_MODE */
                status = cx231xx_reg_mask_write(dev,
                                VID_BLK_I2C_ADDRESS, 32,
                                AFE_CTRL_C2HH_SRC_CTRL, 15, 22, 0xFF);
                /* no inv */
                status = cx231xx_reg_mask_write(dev,
                                VID_BLK_I2C_ADDRESS, 32,
                                AFE_CTRL_C2HH_SRC_CTRL, 9, 9, 0x1);
        } else if (standard != DIF_USE_BASEBAND) {
                if (standard & V4L2_STD_MN) {
                        /* lo if big signal */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 30, 31, 0x1);
                        /* FUNC_MODE = DIF */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 23, 24,
                                        function_mode);
                        /* IF_MODE */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 15, 22, 0xb);
                        /* no inv */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 9, 9, 0x1);
                        /* 0x124, AUD_CHAN1_SRC = 0x3 */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AUD_IO_CTRL, 0, 31, 0x00000003);
                } else if ((standard == V4L2_STD_PAL_I) |
                        (standard & V4L2_STD_SECAM)) {
                        /* C2HH setup */
                        /* lo if big signal */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 30, 31, 0x1);
                        /* FUNC_MODE = DIF */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 23, 24,
                                        function_mode);
                        /* IF_MODE */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 15, 22, 0xF);
                        /* no inv */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 9, 9, 0x1);
                } else {
                        /* default PAL BG */
                        /* C2HH setup */
                        /* lo if big signal */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 30, 31, 0x1);
                        /* FUNC_MODE = DIF */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 23, 24,
                                        function_mode);
                        /* IF_MODE */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 15, 22, 0xE);
                        /* no inv */
                        status = cx231xx_reg_mask_write(dev,
                                        VID_BLK_I2C_ADDRESS, 32,
                                        AFE_CTRL_C2HH_SRC_CTRL, 9, 9, 0x1);
                }
        }

        return status;
}

int cx231xx_dif_set_standard(struct cx231xx *dev, u32 standard)
{
        int status = 0;
        u32 dif_misc_ctrl_value = 0;
        u32 func_mode = 0;

        cx231xx_info("%s: setStandard to %x\n", __func__, standard);

        status = vid_blk_read_word(dev, DIF_MISC_CTRL, &dif_misc_ctrl_value);
        if (standard != DIF_USE_BASEBAND)
                dev->norm = standard;

        switch (dev->model) {
        case CX231XX_BOARD_CNXT_RDE_250:
        case CX231XX_BOARD_CNXT_RDU_250:
                func_mode = 0x03;
                break;
        default:
                func_mode = 0x01;
        }

        status = cx231xx_dif_configure_C2HH_for_low_IF(dev, dev->active_mode,
                                                  func_mode, standard);

        if (standard == DIF_USE_BASEBAND) {     /* base band */
                /* There is a different SRC_PHASE_INC value
                   for baseband vs. DIF */
                status = vid_blk_write_word(dev, DIF_SRC_PHASE_INC, 0xDF7DF83);
                status = vid_blk_read_word(dev, DIF_MISC_CTRL,
                                                &dif_misc_ctrl_value);
                dif_misc_ctrl_value |= FLD_DIF_DIF_BYPASS;
                status = vid_blk_write_word(dev, DIF_MISC_CTRL,
                                                dif_misc_ctrl_value);
        } else if (standard & V4L2_STD_PAL_D) {
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL, 0, 31, 0x6503bc0c);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL1, 0, 31, 0xbd038c85);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL2, 0, 31, 0x1db4640a);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL3, 0, 31, 0x00008800);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_REF, 0, 31, 0x444C1380);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_IF, 0, 31, 0xDA302600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_INT, 0, 31, 0xDA261700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_RF, 0, 31, 0xDA262600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_INT_CURRENT, 0, 31,
                                           0x26001700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_RF_CURRENT, 0, 31,
                                           0x00002660);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VIDEO_AGC_CTRL, 0, 31,
                                           0x72500800);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VID_AUD_OVERRIDE, 0, 31,
                                           0x27000100);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AV_SEP_CTRL, 0, 31, 0x3F3934EA);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_COMP_FLT_CTRL, 0, 31,
                                           0x00000000);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_PHASE_INC, 0, 31,
                                           0x1befbf06);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_GAIN_CONTROL, 0, 31,
                                           0x000035e8);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_RPT_VARIANCE, 0, 31, 0x00000000);
                /* Save the Spec Inversion value */
                dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;
                dif_misc_ctrl_value |= 0x3a023F11;
        } else if (standard & V4L2_STD_PAL_I) {
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL, 0, 31, 0x6503bc0c);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL1, 0, 31, 0xbd038c85);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL2, 0, 31, 0x1db4640a);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL3, 0, 31, 0x00008800);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_REF, 0, 31, 0x444C1380);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_IF, 0, 31, 0xDA302600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_INT, 0, 31, 0xDA261700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_RF, 0, 31, 0xDA262600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_INT_CURRENT, 0, 31,
                                           0x26001700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_RF_CURRENT, 0, 31,
                                           0x00002660);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VIDEO_AGC_CTRL, 0, 31,
                                           0x72500800);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VID_AUD_OVERRIDE, 0, 31,
                                           0x27000100);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AV_SEP_CTRL, 0, 31, 0x5F39A934);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_COMP_FLT_CTRL, 0, 31,
                                           0x00000000);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_PHASE_INC, 0, 31,
                                           0x1befbf06);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_GAIN_CONTROL, 0, 31,
                                           0x000035e8);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_RPT_VARIANCE, 0, 31, 0x00000000);
                /* Save the Spec Inversion value */
                dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;
                dif_misc_ctrl_value |= 0x3a033F11;
        } else if (standard & V4L2_STD_PAL_M) {
                /* improved Low Frequency Phase Noise */
                status = vid_blk_write_word(dev, DIF_PLL_CTRL, 0xFF01FF0C);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL1, 0xbd038c85);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL2, 0x1db4640a);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL3, 0x00008800);
                status = vid_blk_write_word(dev, DIF_AGC_IF_REF, 0x444C1380);
                status = vid_blk_write_word(dev, DIF_AGC_IF_INT_CURRENT,
                                                0x26001700);
                status = vid_blk_write_word(dev, DIF_AGC_RF_CURRENT,
                                                0x00002660);
                status = vid_blk_write_word(dev, DIF_VIDEO_AGC_CTRL,
                                                0x72500800);
                status = vid_blk_write_word(dev, DIF_VID_AUD_OVERRIDE,
                                                0x27000100);
                status = vid_blk_write_word(dev, DIF_AV_SEP_CTRL, 0x012c405d);
                status = vid_blk_write_word(dev, DIF_COMP_FLT_CTRL,
                                                0x009f50c1);
                status = vid_blk_write_word(dev, DIF_SRC_PHASE_INC,
                                                0x1befbf06);
                status = vid_blk_write_word(dev, DIF_SRC_GAIN_CONTROL,
                                                0x000035e8);
                status = vid_blk_write_word(dev, DIF_SOFT_RST_CTRL_REVB,
                                                0x00000000);
                /* Save the Spec Inversion value */
                dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;
                dif_misc_ctrl_value |= 0x3A0A3F10;
        } else if (standard & (V4L2_STD_PAL_N | V4L2_STD_PAL_Nc)) {
                /* improved Low Frequency Phase Noise */
                status = vid_blk_write_word(dev, DIF_PLL_CTRL, 0xFF01FF0C);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL1, 0xbd038c85);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL2, 0x1db4640a);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL3, 0x00008800);
                status = vid_blk_write_word(dev, DIF_AGC_IF_REF, 0x444C1380);
                status = vid_blk_write_word(dev, DIF_AGC_IF_INT_CURRENT,
                                                0x26001700);
                status = vid_blk_write_word(dev, DIF_AGC_RF_CURRENT,
                                                0x00002660);
                status = vid_blk_write_word(dev, DIF_VIDEO_AGC_CTRL,
                                                0x72500800);
                status = vid_blk_write_word(dev, DIF_VID_AUD_OVERRIDE,
                                                0x27000100);
                status = vid_blk_write_word(dev, DIF_AV_SEP_CTRL,
                                                0x012c405d);
                status = vid_blk_write_word(dev, DIF_COMP_FLT_CTRL,
                                                0x009f50c1);
                status = vid_blk_write_word(dev, DIF_SRC_PHASE_INC,
                                                0x1befbf06);
                status = vid_blk_write_word(dev, DIF_SRC_GAIN_CONTROL,
                                                0x000035e8);
                status = vid_blk_write_word(dev, DIF_SOFT_RST_CTRL_REVB,
                                                0x00000000);
                /* Save the Spec Inversion value */
                dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;
                dif_misc_ctrl_value = 0x3A093F10;
        } else if (standard &
                  (V4L2_STD_SECAM_B | V4L2_STD_SECAM_D | V4L2_STD_SECAM_G |
                   V4L2_STD_SECAM_K | V4L2_STD_SECAM_K1)) {

                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL, 0, 31, 0x6503bc0c);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL1, 0, 31, 0xbd038c85);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL2, 0, 31, 0x1db4640a);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL3, 0, 31, 0x00008800);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_REF, 0, 31, 0x888C0380);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_IF, 0, 31, 0xe0262600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_INT, 0, 31, 0xc2171700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_RF, 0, 31, 0xc2262600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_INT_CURRENT, 0, 31,
                                           0x26001700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_RF_CURRENT, 0, 31,
                                           0x00002660);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VID_AUD_OVERRIDE, 0, 31,
                                           0x27000100);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AV_SEP_CTRL, 0, 31, 0x3F3530ec);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_COMP_FLT_CTRL, 0, 31,
                                           0x00000000);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_PHASE_INC, 0, 31,
                                           0x1befbf06);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_GAIN_CONTROL, 0, 31,
                                           0x000035e8);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_RPT_VARIANCE, 0, 31, 0x00000000);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VIDEO_AGC_CTRL, 0, 31,
                                           0xf4000000);

                /* Save the Spec Inversion value */
                dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;
                dif_misc_ctrl_value |= 0x3a023F11;
        } else if (standard & (V4L2_STD_SECAM_L | V4L2_STD_SECAM_LC)) {
                /* Is it SECAM_L1? */
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL, 0, 31, 0x6503bc0c);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL1, 0, 31, 0xbd038c85);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL2, 0, 31, 0x1db4640a);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL3, 0, 31, 0x00008800);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_REF, 0, 31, 0x888C0380);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_IF, 0, 31, 0xe0262600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_INT, 0, 31, 0xc2171700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_RF, 0, 31, 0xc2262600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_INT_CURRENT, 0, 31,
                                           0x26001700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_RF_CURRENT, 0, 31,
                                           0x00002660);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VID_AUD_OVERRIDE, 0, 31,
                                           0x27000100);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AV_SEP_CTRL, 0, 31, 0x3F3530ec);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_COMP_FLT_CTRL, 0, 31,
                                           0x00000000);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_PHASE_INC, 0, 31,
                                           0x1befbf06);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_GAIN_CONTROL, 0, 31,
                                           0x000035e8);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_RPT_VARIANCE, 0, 31, 0x00000000);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VIDEO_AGC_CTRL, 0, 31,
                                           0xf2560000);

                /* Save the Spec Inversion value */
                dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;
                dif_misc_ctrl_value |= 0x3a023F11;

        } else if (standard & V4L2_STD_NTSC_M) {
                /* V4L2_STD_NTSC_M (75 IRE Setup) Or
                   V4L2_STD_NTSC_M_JP (Japan,  0 IRE Setup) */

                /* For NTSC the centre frequency of video coming out of
                   sidewinder is around 7.1MHz or 3.6MHz depending on the
                   spectral inversion. so for a non spectrally inverted channel
                   the pll freq word is 0x03420c49
                 */

                status = vid_blk_write_word(dev, DIF_PLL_CTRL, 0x6503BC0C);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL1, 0xBD038C85);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL2, 0x1DB4640A);
                status = vid_blk_write_word(dev, DIF_PLL_CTRL3, 0x00008800);
                status = vid_blk_write_word(dev, DIF_AGC_IF_REF, 0x444C0380);
                status = vid_blk_write_word(dev, DIF_AGC_IF_INT_CURRENT,
                                                0x26001700);
                status = vid_blk_write_word(dev, DIF_AGC_RF_CURRENT,
                                                0x00002660);
                status = vid_blk_write_word(dev, DIF_VIDEO_AGC_CTRL,
                                                0x04000800);
                status = vid_blk_write_word(dev, DIF_VID_AUD_OVERRIDE,
                                                0x27000100);
                status = vid_blk_write_word(dev, DIF_AV_SEP_CTRL, 0x01296e1f);

                status = vid_blk_write_word(dev, DIF_COMP_FLT_CTRL,
                                                0x009f50c1);
                status = vid_blk_write_word(dev, DIF_SRC_PHASE_INC,
                                                0x1befbf06);
                status = vid_blk_write_word(dev, DIF_SRC_GAIN_CONTROL,
                                                0x000035e8);

                status = vid_blk_write_word(dev, DIF_AGC_CTRL_IF, 0xC2262600);
                status = vid_blk_write_word(dev, DIF_AGC_CTRL_INT,
                                                0xC2262600);
                status = vid_blk_write_word(dev, DIF_AGC_CTRL_RF, 0xC2262600);

                /* Save the Spec Inversion value */
                dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;
                dif_misc_ctrl_value |= 0x3a003F10;
        } else {
                /* default PAL BG */
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL, 0, 31, 0x6503bc0c);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL1, 0, 31, 0xbd038c85);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL2, 0, 31, 0x1db4640a);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_PLL_CTRL3, 0, 31, 0x00008800);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_REF, 0, 31, 0x444C1380);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_IF, 0, 31, 0xDA302600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_INT, 0, 31, 0xDA261700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_CTRL_RF, 0, 31, 0xDA262600);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_IF_INT_CURRENT, 0, 31,
                                           0x26001700);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AGC_RF_CURRENT, 0, 31,
                                           0x00002660);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VIDEO_AGC_CTRL, 0, 31,
                                           0x72500800);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_VID_AUD_OVERRIDE, 0, 31,
                                           0x27000100);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_AV_SEP_CTRL, 0, 31, 0x3F3530EC);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_COMP_FLT_CTRL, 0, 31,
                                           0x00A653A8);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_PHASE_INC, 0, 31,
                                           0x1befbf06);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_SRC_GAIN_CONTROL, 0, 31,
                                           0x000035e8);
                status = cx231xx_reg_mask_write(dev, VID_BLK_I2C_ADDRESS, 32,
                                           DIF_RPT_VARIANCE, 0, 31, 0x00000000);
                /* Save the Spec Inversion value */
                dif_misc_ctrl_value &= FLD_DIF_SPEC_INV;
                dif_misc_ctrl_value |= 0x3a013F11;
        }

        /* The AGC values should be the same for all standards,
           AUD_SRC_SEL[19] should always be disabled    */
        dif_misc_ctrl_value &= ~FLD_DIF_AUD_SRC_SEL;

        /* It is still possible to get Set Standard calls even when we
           are in FM mode.
           This is done to override the value for FM. */
        if (dev->active_mode == V4L2_TUNER_RADIO)
                dif_misc_ctrl_value = 0x7a080000;

        /* Write the calculated value for misc ontrol register      */
        status = vid_blk_write_word(dev, DIF_MISC_CTRL, dif_misc_ctrl_value);

        return status;
}

int cx231xx_tuner_pre_channel_change(struct cx231xx *dev)
{
        int status = 0;
        u32 dwval;

        /* Set the RF and IF k_agc values to 3 */
        status = vid_blk_read_word(dev, DIF_AGC_IF_REF, &dwval);
        dwval &= ~(FLD_DIF_K_AGC_RF | FLD_DIF_K_AGC_IF);
        dwval |= 0x33000000;

        status = vid_blk_write_word(dev, DIF_AGC_IF_REF, dwval);

        return status;
}

int cx231xx_tuner_post_channel_change(struct cx231xx *dev)
{
        int status = 0;
        u32 dwval;

        /* Set the RF and IF k_agc values to 4 for PAL/NTSC and 8 for
         * SECAM L/B/D standards */
        status = vid_blk_read_word(dev, DIF_AGC_IF_REF, &dwval);
        dwval &= ~(FLD_DIF_K_AGC_RF | FLD_DIF_K_AGC_IF);

        if (dev->norm & (V4L2_STD_SECAM_L | V4L2_STD_SECAM_B |
                         V4L2_STD_SECAM_D))
                dwval |= 0x88000000;
        else
                dwval |= 0x44000000;

        status = vid_blk_write_word(dev, DIF_AGC_IF_REF, dwval);

        return status;
}

/******************************************************************************
 *                  I 2 S - B L O C K    C O N T R O L   functions            *
 ******************************************************************************/
int cx231xx_i2s_blk_initialize(struct cx231xx *dev)
{
        int status = 0;
        u32 value;

        status = cx231xx_read_i2c_data(dev, I2S_BLK_DEVICE_ADDRESS,
                                       CH_PWR_CTRL1, 1, &value, 1);
        /* enables clock to delta-sigma and decimation filter */
        value |= 0x80;
        status = cx231xx_write_i2c_data(dev, I2S_BLK_DEVICE_ADDRESS,
                                        CH_PWR_CTRL1, 1, value, 1);
        /* power up all channel */
        status = cx231xx_write_i2c_data(dev, I2S_BLK_DEVICE_ADDRESS,
                                        CH_PWR_CTRL2, 1, 0x00, 1);

        return status;
}

int cx231xx_i2s_blk_update_power_control(struct cx231xx *dev,
                                        enum AV_MODE avmode)
{
        int status = 0;
        u32 value = 0;

        if (avmode != POLARIS_AVMODE_ENXTERNAL_AV) {
                status = cx231xx_read_i2c_data(dev, I2S_BLK_DEVICE_ADDRESS,
                                          CH_PWR_CTRL2, 1, &value, 1);
                value |= 0xfe;
                status = cx231xx_write_i2c_data(dev, I2S_BLK_DEVICE_ADDRESS,
                                                CH_PWR_CTRL2, 1, value, 1);
        } else {
                status = cx231xx_write_i2c_data(dev, I2S_BLK_DEVICE_ADDRESS,
                                                CH_PWR_CTRL2, 1, 0x00, 1);
        }

        return status;
}

/* set i2s_blk for audio input types */
int cx231xx_i2s_blk_set_audio_input(struct cx231xx *dev, u8 audio_input)
{
        int status = 0;

        switch (audio_input) {
        case CX231XX_AMUX_LINE_IN:
                status = cx231xx_write_i2c_data(dev, I2S_BLK_DEVICE_ADDRESS,
                                                CH_PWR_CTRL2, 1, 0x00, 1);
                status = cx231xx_write_i2c_data(dev, I2S_BLK_DEVICE_ADDRESS,
                                                CH_PWR_CTRL1, 1, 0x80, 1);
                break;
        case CX231XX_AMUX_VIDEO:
        default:
                break;
        }

        dev->ctl_ainput = audio_input;

        return status;
}

/******************************************************************************
 *                  P O W E R      C O N T R O L   functions                  *
 ******************************************************************************/
int cx231xx_set_power_mode(struct cx231xx *dev, enum AV_MODE mode)
{
        u8 value[4] = { 0, 0, 0, 0 };
        u32 tmp = 0;
        int status = 0;

        if (dev->power_mode != mode)
                dev->power_mode = mode;
        else {
                cx231xx_info(" setPowerMode::mode = %d, No Change req.\n",
                             mode);
                return 0;
        }

        cx231xx_info(" setPowerMode::mode = %d\n", mode);

        status = cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER, PWR_CTL_EN, value,
                                       4);
        if (status < 0)
                return status;

        tmp = *((u32 *) value);

        switch (mode) {
        case POLARIS_AVMODE_ENXTERNAL_AV:

                tmp &= (~PWR_MODE_MASK);

                tmp |= PWR_AV_EN;
                value[0] = (u8) tmp;
                value[1] = (u8) (tmp >> 8);
                value[2] = (u8) (tmp >> 16);
                value[3] = (u8) (tmp >> 24);
                status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                PWR_CTL_EN, value, 4);
                msleep(PWR_SLEEP_INTERVAL);

                tmp |= PWR_ISO_EN;
                value[0] = (u8) tmp;
                value[1] = (u8) (tmp >> 8);
                value[2] = (u8) (tmp >> 16);
                value[3] = (u8) (tmp >> 24);
                status =
                    cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER, PWR_CTL_EN,
                                           value, 4);
                msleep(PWR_SLEEP_INTERVAL);

                tmp |= POLARIS_AVMODE_ENXTERNAL_AV;
                value[0] = (u8) tmp;
                value[1] = (u8) (tmp >> 8);
                value[2] = (u8) (tmp >> 16);
                value[3] = (u8) (tmp >> 24);
                status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                PWR_CTL_EN, value, 4);

                /* reset state of xceive tuner */
                dev->xc_fw_load_done = 0;
                break;

        case POLARIS_AVMODE_ANALOGT_TV:

                tmp &= (~PWR_DEMOD_EN);
                tmp |= (I2C_DEMOD_EN);
                value[0] = (u8) tmp;
                value[1] = (u8) (tmp >> 8);
                value[2] = (u8) (tmp >> 16);
                value[3] = (u8) (tmp >> 24);
                status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                PWR_CTL_EN, value, 4);
                msleep(PWR_SLEEP_INTERVAL);

                if (!(tmp & PWR_TUNER_EN)) {
                        tmp |= (PWR_TUNER_EN);
                        value[0] = (u8) tmp;
                        value[1] = (u8) (tmp >> 8);
                        value[2] = (u8) (tmp >> 16);
                        value[3] = (u8) (tmp >> 24);
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                        PWR_CTL_EN, value, 4);
                        msleep(PWR_SLEEP_INTERVAL);
                }

                if (!(tmp & PWR_AV_EN)) {
                        tmp |= PWR_AV_EN;
                        value[0] = (u8) tmp;
                        value[1] = (u8) (tmp >> 8);
                        value[2] = (u8) (tmp >> 16);
                        value[3] = (u8) (tmp >> 24);
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                        PWR_CTL_EN, value, 4);
                        msleep(PWR_SLEEP_INTERVAL);
                }
                if (!(tmp & PWR_ISO_EN)) {
                        tmp |= PWR_ISO_EN;
                        value[0] = (u8) tmp;
                        value[1] = (u8) (tmp >> 8);
                        value[2] = (u8) (tmp >> 16);
                        value[3] = (u8) (tmp >> 24);
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                        PWR_CTL_EN, value, 4);
                        msleep(PWR_SLEEP_INTERVAL);
                }

                if (!(tmp & POLARIS_AVMODE_ANALOGT_TV)) {
                        tmp |= POLARIS_AVMODE_ANALOGT_TV;
                        value[0] = (u8) tmp;
                        value[1] = (u8) (tmp >> 8);
                        value[2] = (u8) (tmp >> 16);
                        value[3] = (u8) (tmp >> 24);
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                        PWR_CTL_EN, value, 4);
                        msleep(PWR_SLEEP_INTERVAL);
                }

                if ((dev->model == CX231XX_BOARD_CNXT_RDE_250) ||
                    (dev->model == CX231XX_BOARD_CNXT_RDU_250)) {
                        /* tuner path to channel 1 from port 3 */
                        cx231xx_enable_i2c_for_tuner(dev, I2C_3);

                        if (dev->cx231xx_reset_analog_tuner)
                                dev->cx231xx_reset_analog_tuner(dev);
                }
                break;

        case POLARIS_AVMODE_DIGITAL:
                if (!(tmp & PWR_TUNER_EN)) {
                        tmp |= (PWR_TUNER_EN);
                        value[0] = (u8) tmp;
                        value[1] = (u8) (tmp >> 8);
                        value[2] = (u8) (tmp >> 16);
                        value[3] = (u8) (tmp >> 24);
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                        PWR_CTL_EN, value, 4);
                        msleep(PWR_SLEEP_INTERVAL);
                }
                if (!(tmp & PWR_AV_EN)) {
                        tmp |= PWR_AV_EN;
                        value[0] = (u8) tmp;
                        value[1] = (u8) (tmp >> 8);
                        value[2] = (u8) (tmp >> 16);
                        value[3] = (u8) (tmp >> 24);
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                        PWR_CTL_EN, value, 4);
                        msleep(PWR_SLEEP_INTERVAL);
                }
                if (!(tmp & PWR_ISO_EN)) {
                        tmp |= PWR_ISO_EN;
                        value[0] = (u8) tmp;
                        value[1] = (u8) (tmp >> 8);
                        value[2] = (u8) (tmp >> 16);
                        value[3] = (u8) (tmp >> 24);
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                        PWR_CTL_EN, value, 4);
                        msleep(PWR_SLEEP_INTERVAL);
                }

                tmp |= POLARIS_AVMODE_DIGITAL | I2C_DEMOD_EN;
                value[0] = (u8) tmp;
                value[1] = (u8) (tmp >> 8);
                value[2] = (u8) (tmp >> 16);
                value[3] = (u8) (tmp >> 24);
                status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                PWR_CTL_EN, value, 4);
                msleep(PWR_SLEEP_INTERVAL);

                if (!(tmp & PWR_DEMOD_EN)) {
                        tmp |= PWR_DEMOD_EN;
                        value[0] = (u8) tmp;
                        value[1] = (u8) (tmp >> 8);
                        value[2] = (u8) (tmp >> 16);
                        value[3] = (u8) (tmp >> 24);
                        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                        PWR_CTL_EN, value, 4);
                        msleep(PWR_SLEEP_INTERVAL);
                }

                if ((dev->model == CX231XX_BOARD_CNXT_RDE_250) ||
                    (dev->model == CX231XX_BOARD_CNXT_RDU_250)) {
                        /* tuner path to channel 1 from port 3 */
                        cx231xx_enable_i2c_for_tuner(dev, I2C_3);

                        if (dev->cx231xx_reset_analog_tuner)
                                dev->cx231xx_reset_analog_tuner(dev);
                }
                break;

        default:
                break;
        }

        msleep(PWR_SLEEP_INTERVAL);

        /* For power saving, only enable Pwr_resetout_n
           when digital TV is selected. */
        if (mode == POLARIS_AVMODE_DIGITAL) {
                tmp |= PWR_RESETOUT_EN;
                value[0] = (u8) tmp;
                value[1] = (u8) (tmp >> 8);
                value[2] = (u8) (tmp >> 16);
                value[3] = (u8) (tmp >> 24);
                status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER,
                                                PWR_CTL_EN, value, 4);
                msleep(PWR_SLEEP_INTERVAL);
        }

        /* update power control for afe */
        status = cx231xx_afe_update_power_control(dev, mode);

        /* update power control for i2s_blk */
        status = cx231xx_i2s_blk_update_power_control(dev, mode);

        status = cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER, PWR_CTL_EN, value,
                                       4);
        cx231xx_info(" The data of PWR_CTL_EN register 0x74"
                                 "=0x%0x,0x%0x,0x%0x,0x%0x\n",
                     value[0], value[1], value[2], value[3]);

        return status;
}

int cx231xx_power_suspend(struct cx231xx *dev)
{
        u8 value[4] = { 0, 0, 0, 0 };
        u32 tmp = 0;
        int status = 0;

        status = cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER, PWR_CTL_EN,
                                       value, 4);
        if (status > 0)
                return status;

        tmp = *((u32 *) value);
        tmp &= (~PWR_MODE_MASK);

        value[0] = (u8) tmp;
        value[1] = (u8) (tmp >> 8);
        value[2] = (u8) (tmp >> 16);
        value[3] = (u8) (tmp >> 24);
        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER, PWR_CTL_EN,
                                        value, 4);

        return status;
}

/******************************************************************************
 *                  S T R E A M    C O N T R O L   functions                  *
 ******************************************************************************/
int cx231xx_start_stream(struct cx231xx *dev, u32 ep_mask)
{
        u8 value[4] = { 0x0, 0x0, 0x0, 0x0 };
        u32 tmp = 0;
        int status = 0;

        cx231xx_info("cx231xx_start_stream():: ep_mask = %x\n", ep_mask);
        status = cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER, EP_MODE_SET,
                                       value, 4);
        if (status < 0)
                return status;

        tmp = *((u32 *) value);
        tmp |= ep_mask;
        value[0] = (u8) tmp;
        value[1] = (u8) (tmp >> 8);
        value[2] = (u8) (tmp >> 16);
        value[3] = (u8) (tmp >> 24);

        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER, EP_MODE_SET,
                                        value, 4);

        return status;
}

int cx231xx_stop_stream(struct cx231xx *dev, u32 ep_mask)
{
        u8 value[4] = { 0x0, 0x0, 0x0, 0x0 };
        u32 tmp = 0;
        int status = 0;

        cx231xx_info("cx231xx_stop_stream():: ep_mask = %x\n", ep_mask);
        status =
            cx231xx_read_ctrl_reg(dev, VRT_GET_REGISTER, EP_MODE_SET, value, 4);
        if (status < 0)
                return status;

        tmp = *((u32 *) value);
        tmp &= (~ep_mask);
        value[0] = (u8) tmp;
        value[1] = (u8) (tmp >> 8);
        value[2] = (u8) (tmp >> 16);
        value[3] = (u8) (tmp >> 24);

        status = cx231xx_write_ctrl_reg(dev, VRT_SET_REGISTER, EP_MODE_SET,
                                        value, 4);

        return status;
}

int cx231xx_initialize_stream_xfer(struct cx231xx *dev, u32 media_type)

{
        int status = 0;

        if (dev->udev->speed == USB_SPEED_HIGH) {
                switch (media_type) {
                case 81: /* audio */
                        cx231xx_info("%s: Audio enter HANC\n", __func__);
                        status =
                            cx231xx_mode_register(dev, TS_MODE_REG, 0x9300);
                        break;

                case 2: /* vbi */
                        cx231xx_info("%s: set vanc registers\n", __func__);
                        status = cx231xx_mode_register(dev, TS_MODE_REG, 0x300);
                        break;

                case 3: /* sliced cc */
                        cx231xx_info("%s: set hanc registers\n", __func__);
                        status =
                            cx231xx_mode_register(dev, TS_MODE_REG, 0x1300);
                        break;

                case 0: /* video */
                        cx231xx_info("%s: set video registers\n", __func__);
                        status = cx231xx_mode_register(dev, TS_MODE_REG, 0x100);
                        break;

                case 4: /* ts1 */
                        cx231xx_info("%s: set ts1 registers\n", __func__);
                        status = cx231xx_mode_register(dev, TS_MODE_REG, 0x101);
                        status = cx231xx_mode_register(dev, TS1_CFG_REG, 0x400);
                        break;
                case 6: /* ts1 parallel mode */
                        cx231xx_info("%s: set ts1 parrallel mode registers\n",
                                     __func__);
                        status = cx231xx_mode_register(dev, TS_MODE_REG, 0x100);
                        status = cx231xx_mode_register(dev, TS1_CFG_REG, 0x400);
                        break;
                }
        } else {
                status = cx231xx_mode_register(dev, TS_MODE_REG, 0x101);
        }

        return status;
}

int cx231xx_capture_start(struct cx231xx *dev, int start, u8 media_type)
{
        int rc = -1;
        u32 ep_mask = -1;
        struct pcb_config *pcb_config;

        /* get EP for media type */
        pcb_config = (struct pcb_config *)&dev->current_pcb_config;

        if (pcb_config->config_num == 1) {
                switch (media_type) {
                case 0: /* Video */
                        ep_mask = ENABLE_EP4;   /* ep4  [00:1000] */
                        break;
                case 1: /* Audio */
                        ep_mask = ENABLE_EP3;   /* ep3  [00:0100] */
                        break;
                case 2: /* Vbi */
                        ep_mask = ENABLE_EP5;   /* ep5 [01:0000] */
                        break;
                case 3: /* Sliced_cc */
                        ep_mask = ENABLE_EP6;   /* ep6 [10:0000] */
                        break;
                case 4: /* ts1 */
                case 6: /* ts1 parallel mode */
                        ep_mask = ENABLE_EP1;   /* ep1 [00:0001] */
                        break;
                case 5: /* ts2 */
                        ep_mask = ENABLE_EP2;   /* ep2 [00:0010] */
                        break;
                }

        } else if (pcb_config->config_num > 1) {
                switch (media_type) {
                case 0: /* Video */
                        ep_mask = ENABLE_EP4;   /* ep4  [00:1000] */
                        break;
                case 1: /* Audio */
                        ep_mask = ENABLE_EP3;   /* ep3  [00:0100] */
                        break;
                case 2: /* Vbi */
                        ep_mask = ENABLE_EP5;   /* ep5 [01:0000] */
                        break;
                case 3: /* Sliced_cc */
                        ep_mask = ENABLE_EP6;   /* ep6 [10:0000] */
                        break;
                case 4: /* ts1 */
                case 6: /* ts1 parallel mode */
                        ep_mask = ENABLE_EP1;   /* ep1 [00:0001] */
                        break;
                case 5: /* ts2 */
                        ep_mask = ENABLE_EP2;   /* ep2 [00:0010] */
                        break;
                }

        }

        if (start) {
                rc = cx231xx_initialize_stream_xfer(dev, media_type);

                if (rc < 0)
                        return rc;

                /* enable video capture */
                if (ep_mask > 0)
                        rc = cx231xx_start_stream(dev, ep_mask);
        } else {
                /* disable video capture */
                if (ep_mask > 0)
                        rc = cx231xx_stop_stream(dev, ep_mask);
        }

        if (dev->mode == CX231XX_ANALOG_MODE)
                ;/* do any in Analog mode */
        else
                ;/* do any in digital mode */

        return rc;
}
EXPORT_SYMBOL_GPL(cx231xx_capture_start);

/*****************************************************************************
*                   G P I O   B I T control functions                        *
******************************************************************************/
int cx231xx_set_gpio_bit(struct cx231xx *dev, u32 gpio_bit, u8 * gpio_val)
{
        int status = 0;

        status = cx231xx_send_gpio_cmd(dev, gpio_bit, gpio_val, 4, 0, 0);

        return status;
}

int cx231xx_get_gpio_bit(struct cx231xx *dev, u32 gpio_bit, u8 * gpio_val)
{
        int status = 0;

        status = cx231xx_send_gpio_cmd(dev, gpio_bit, gpio_val, 4, 0, 1);

        return status;
}

/*
* cx231xx_set_gpio_direction
*      Sets the direction of the GPIO pin to input or output
*
* Parameters :
*      pin_number : The GPIO Pin number to program the direction for
*                   from 0 to 31
*      pin_value : The Direction of the GPIO Pin under reference.
*                      0 = Input direction
*                      1 = Output direction
*/
int cx231xx_set_gpio_direction(struct cx231xx *dev,
                               int pin_number, int pin_value)
{
        int status = 0;
        u32 value = 0;

        /* Check for valid pin_number - if 32 , bail out */
        if (pin_number >= 32)
                return -EINVAL;

        /* input */
        if (pin_value == 0)
                value = dev->gpio_dir & (~(1 << pin_number));   /* clear */
        else
                value = dev->gpio_dir | (1 << pin_number);

        status = cx231xx_set_gpio_bit(dev, value, (u8 *) &dev->gpio_val);

        /* cache the value for future */
        dev->gpio_dir = value;

        return status;
}

/*
* cx231xx_set_gpio_value
*      Sets the value of the GPIO pin to Logic high or low. The Pin under
*      reference should ALREADY BE SET IN OUTPUT MODE !!!!!!!!!
*
* Parameters :
*      pin_number : The GPIO Pin number to program the direction for
*      pin_value : The value of the GPIO Pin under reference.
*                      0 = set it to 0
*                      1 = set it to 1
*/
int cx231xx_set_gpio_value(struct cx231xx *dev, int pin_number, int pin_value)
{
        int status = 0;
        u32 value = 0;

        /* Check for valid pin_number - if 0xFF , bail out */
        if (pin_number >= 32)
                return -EINVAL;

        /* first do a sanity check - if the Pin is not output, make it output */
        if ((dev->gpio_dir & (1 << pin_number)) == 0x00) {
                /* It was in input mode */
                value = dev->gpio_dir | (1 << pin_number);
                dev->gpio_dir = value;
                status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                              (u8 *) &dev->gpio_val);
                value = 0;
        }

        if (pin_value == 0)
                value = dev->gpio_val & (~(1 << pin_number));
        else
                value = dev->gpio_val | (1 << pin_number);

        /* store the value */
        dev->gpio_val = value;

        /* toggle bit0 of GP_IO */
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        return status;
}

/*****************************************************************************
*                      G P I O I2C related functions                         *
******************************************************************************/
int cx231xx_gpio_i2c_start(struct cx231xx *dev)
{
        int status = 0;

        /* set SCL to output 1 ; set SDA to output 1 */
        dev->gpio_dir |= 1 << dev->board.tuner_scl_gpio;
        dev->gpio_dir |= 1 << dev->board.tuner_sda_gpio;
        dev->gpio_val |= 1 << dev->board.tuner_scl_gpio;
        dev->gpio_val |= 1 << dev->board.tuner_sda_gpio;

        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);
        if (status < 0)
                return -EINVAL;

        /* set SCL to output 1; set SDA to output 0 */
        dev->gpio_val |= 1 << dev->board.tuner_scl_gpio;
        dev->gpio_val &= ~(1 << dev->board.tuner_sda_gpio);

        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);
        if (status < 0)
                return -EINVAL;

        /* set SCL to output 0; set SDA to output 0      */
        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
        dev->gpio_val &= ~(1 << dev->board.tuner_sda_gpio);

        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);
        if (status < 0)
                return -EINVAL;

        return status;
}

int cx231xx_gpio_i2c_end(struct cx231xx *dev)
{
        int status = 0;

        /* set SCL to output 0; set SDA to output 0      */
        dev->gpio_dir |= 1 << dev->board.tuner_scl_gpio;
        dev->gpio_dir |= 1 << dev->board.tuner_sda_gpio;

        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
        dev->gpio_val &= ~(1 << dev->board.tuner_sda_gpio);

        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);
        if (status < 0)
                return -EINVAL;

        /* set SCL to output 1; set SDA to output 0      */
        dev->gpio_val |= 1 << dev->board.tuner_scl_gpio;
        dev->gpio_val &= ~(1 << dev->board.tuner_sda_gpio);

        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);
        if (status < 0)
                return -EINVAL;

        /* set SCL to input ,release SCL cable control
           set SDA to input ,release SDA cable control */
        dev->gpio_dir &= ~(1 << dev->board.tuner_scl_gpio);
        dev->gpio_dir &= ~(1 << dev->board.tuner_sda_gpio);

        status =
            cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);
        if (status < 0)
                return -EINVAL;

        return status;
}

int cx231xx_gpio_i2c_write_byte(struct cx231xx *dev, u8 data)
{
        int status = 0;
        u8 i;

        /* set SCL to output ; set SDA to output */
        dev->gpio_dir |= 1 << dev->board.tuner_scl_gpio;
        dev->gpio_dir |= 1 << dev->board.tuner_sda_gpio;

        for (i = 0; i < 8; i++) {
                if (((data << i) & 0x80) == 0) {
                        /* set SCL to output 0; set SDA to output 0     */
                        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
                        dev->gpio_val &= ~(1 << dev->board.tuner_sda_gpio);
                        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                                      (u8 *)&dev->gpio_val);

                        /* set SCL to output 1; set SDA to output 0     */
                        dev->gpio_val |= 1 << dev->board.tuner_scl_gpio;
                        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                                      (u8 *)&dev->gpio_val);

                        /* set SCL to output 0; set SDA to output 0     */
                        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
                        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                                      (u8 *)&dev->gpio_val);
                } else {
                        /* set SCL to output 0; set SDA to output 1     */
                        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
                        dev->gpio_val |= 1 << dev->board.tuner_sda_gpio;
                        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                                      (u8 *)&dev->gpio_val);

                        /* set SCL to output 1; set SDA to output 1     */
                        dev->gpio_val |= 1 << dev->board.tuner_scl_gpio;
                        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                                      (u8 *)&dev->gpio_val);

                        /* set SCL to output 0; set SDA to output 1     */
                        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
                        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                                      (u8 *)&dev->gpio_val);
                }
        }
        return status;
}

int cx231xx_gpio_i2c_read_byte(struct cx231xx *dev, u8 * buf)
{
        u8 value = 0;
        int status = 0;
        u32 gpio_logic_value = 0;
        u8 i;

        /* read byte */
        for (i = 0; i < 8; i++) {       /* send write I2c addr */

                /* set SCL to output 0; set SDA to input */
                dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
                status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                              (u8 *)&dev->gpio_val);

                /* set SCL to output 1; set SDA to input */
                dev->gpio_val |= 1 << dev->board.tuner_scl_gpio;
                status = cx231xx_set_gpio_bit(dev, dev->gpio_dir,
                                              (u8 *)&dev->gpio_val);

                /* get SDA data bit */
                gpio_logic_value = dev->gpio_val;
                status = cx231xx_get_gpio_bit(dev, dev->gpio_dir,
                                              (u8 *)&dev->gpio_val);
                if ((dev->gpio_val & (1 << dev->board.tuner_sda_gpio)) != 0)
                        value |= (1 << (8 - i - 1));

                dev->gpio_val = gpio_logic_value;
        }

        /* set SCL to output 0,finish the read latest SCL signal.
           !!!set SDA to input, never to modify SDA direction at
           the same times */
        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        /* store the value */
        *buf = value & 0xff;

        return status;
}

int cx231xx_gpio_i2c_read_ack(struct cx231xx *dev)
{
        int status = 0;
        u32 gpio_logic_value = 0;
        int nCnt = 10;
        int nInit = nCnt;

        /* clock stretch; set SCL to input; set SDA to input;
           get SCL value till SCL = 1 */
        dev->gpio_dir &= ~(1 << dev->board.tuner_sda_gpio);
        dev->gpio_dir &= ~(1 << dev->board.tuner_scl_gpio);

        gpio_logic_value = dev->gpio_val;
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        do {
                msleep(2);
                status = cx231xx_get_gpio_bit(dev, dev->gpio_dir,
                                              (u8 *)&dev->gpio_val);
                nCnt--;
        } while (((dev->gpio_val &
                          (1 << dev->board.tuner_scl_gpio)) == 0) &&
                         (nCnt > 0));

        if (nCnt == 0)
                cx231xx_info("No ACK after %d msec -GPIO I2C failed!",
                             nInit * 10);

        /* readAck
           throuth clock stretch ,slave has given a SCL signal,
           so the SDA data can be directly read.  */
        status = cx231xx_get_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        if ((dev->gpio_val & 1 << dev->board.tuner_sda_gpio) == 0) {
                dev->gpio_val = gpio_logic_value;
                dev->gpio_val &= ~(1 << dev->board.tuner_sda_gpio);
                status = 0;
        } else {
                dev->gpio_val = gpio_logic_value;
                dev->gpio_val |= (1 << dev->board.tuner_sda_gpio);
        }

        /* read SDA end, set the SCL to output 0, after this operation,
           SDA direction can be changed. */
        dev->gpio_val = gpio_logic_value;
        dev->gpio_dir |= (1 << dev->board.tuner_scl_gpio);
        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        return status;
}

int cx231xx_gpio_i2c_write_ack(struct cx231xx *dev)
{
        int status = 0;

        /* set SDA to ouput */
        dev->gpio_dir |= 1 << dev->board.tuner_sda_gpio;
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        /* set SCL = 0 (output); set SDA = 0 (output) */
        dev->gpio_val &= ~(1 << dev->board.tuner_sda_gpio);
        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        /* set SCL = 1 (output); set SDA = 0 (output) */
        dev->gpio_val |= 1 << dev->board.tuner_scl_gpio;
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        /* set SCL = 0 (output); set SDA = 0 (output) */
        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        /* set SDA to input,and then the slave will read data from SDA. */
        dev->gpio_dir &= ~(1 << dev->board.tuner_sda_gpio);
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        return status;
}

int cx231xx_gpio_i2c_write_nak(struct cx231xx *dev)
{
        int status = 0;

        /* set scl to output ; set sda to input */
        dev->gpio_dir |= 1 << dev->board.tuner_scl_gpio;
        dev->gpio_dir &= ~(1 << dev->board.tuner_sda_gpio);
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        /* set scl to output 0; set sda to input */
        dev->gpio_val &= ~(1 << dev->board.tuner_scl_gpio);
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        /* set scl to output 1; set sda to input */
        dev->gpio_val |= 1 << dev->board.tuner_scl_gpio;
        status = cx231xx_set_gpio_bit(dev, dev->gpio_dir, (u8 *)&dev->gpio_val);

        return status;
}

/*****************************************************************************
*                      G P I O I2C related functions                         *
******************************************************************************/
/* cx231xx_gpio_i2c_read
 * Function to read data from gpio based I2C interface
 */
int cx231xx_gpio_i2c_read(struct cx231xx *dev, u8 dev_addr, u8 * buf, u8 len)
{
        int status = 0;
        int i = 0;

        /* get the lock */
        mutex_lock(&dev->gpio_i2c_lock);

        /* start */
        status = cx231xx_gpio_i2c_start(dev);

        /* write dev_addr */
        status = cx231xx_gpio_i2c_write_byte(dev, (dev_addr << 1) + 1);

        /* readAck */
        status = cx231xx_gpio_i2c_read_ack(dev);

        /* read data */
        for (i = 0; i < len; i++) {
                /* read data */
                buf[i] = 0;
                status = cx231xx_gpio_i2c_read_byte(dev, &buf[i]);

                if ((i + 1) != len) {
                        /* only do write ack if we more length */
                        status = cx231xx_gpio_i2c_write_ack(dev);
                }
        }

        /* write NAK - inform reads are complete */
        status = cx231xx_gpio_i2c_write_nak(dev);

        /* write end */
        status = cx231xx_gpio_i2c_end(dev);

        /* release the lock */
        mutex_unlock(&dev->gpio_i2c_lock);

        return status;
}

/* cx231xx_gpio_i2c_write
 * Function to write data to gpio based I2C interface
 */
int cx231xx_gpio_i2c_write(struct cx231xx *dev, u8 dev_addr, u8 * buf, u8 len)
{
        int status = 0;
        int i = 0;

        /* get the lock */
        mutex_lock(&dev->gpio_i2c_lock);

        /* start */
        status = cx231xx_gpio_i2c_start(dev);

        /* write dev_addr */
        status = cx231xx_gpio_i2c_write_byte(dev, dev_addr << 1);

        /* read Ack */
        status = cx231xx_gpio_i2c_read_ack(dev);

        for (i = 0; i < len; i++) {
                /* Write data */
                status = cx231xx_gpio_i2c_write_byte(dev, buf[i]);

                /* read Ack */
                status = cx231xx_gpio_i2c_read_ack(dev);
        }

        /* write End */
        status = cx231xx_gpio_i2c_end(dev);

        /* release the lock */
        mutex_unlock(&dev->gpio_i2c_lock);

        return 0;
}