drivers/media/pci/cx25821/cx25821-medusa-video.c - kernel/lockdown - Git at Google

 /*
  *  Driver for the Conexant CX25821 PCIe bridge
  *
  *  Copyright (C) 2009 Conexant Systems Inc.
  *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
  *
  *  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.
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include "cx25821.h"
 #include "cx25821-medusa-video.h"
 #include "cx25821-biffuncs.h"

 /*
  * medusa_enable_bluefield_output()
  *
  * Enable the generation of blue filed output if no video
  *
  */
 static void medusa_enable_bluefield_output(struct cx25821_dev *dev, int channel,
 					   int enable)
 {
 	u32 value = 0;
 	u32 tmp = 0;
 	int out_ctrl = OUT_CTRL1;
 	int out_ctrl_ns = OUT_CTRL_NS;

 	switch (channel) {
 	default:
 	case VDEC_A:
 		break;
 	case VDEC_B:
 		out_ctrl = VDEC_B_OUT_CTRL1;
 		out_ctrl_ns = VDEC_B_OUT_CTRL_NS;
 		break;
 	case VDEC_C:
 		out_ctrl = VDEC_C_OUT_CTRL1;
 		out_ctrl_ns = VDEC_C_OUT_CTRL_NS;
 		break;
 	case VDEC_D:
 		out_ctrl = VDEC_D_OUT_CTRL1;
 		out_ctrl_ns = VDEC_D_OUT_CTRL_NS;
 		break;
 	case VDEC_E:
 		out_ctrl = VDEC_E_OUT_CTRL1;
 		out_ctrl_ns = VDEC_E_OUT_CTRL_NS;
 		return;
 	case VDEC_F:
 		out_ctrl = VDEC_F_OUT_CTRL1;
 		out_ctrl_ns = VDEC_F_OUT_CTRL_NS;
 		return;
 	case VDEC_G:
 		out_ctrl = VDEC_G_OUT_CTRL1;
 		out_ctrl_ns = VDEC_G_OUT_CTRL_NS;
 		return;
 	case VDEC_H:
 		out_ctrl = VDEC_H_OUT_CTRL1;
 		out_ctrl_ns = VDEC_H_OUT_CTRL_NS;
 		return;
 	}

 	value = cx25821_i2c_read(&dev->i2c_bus[0], out_ctrl, &tmp);
 	value &= 0xFFFFFF7F;	/* clear BLUE_FIELD_EN */
 	if (enable)
 		value |= 0x00000080;	/* set BLUE_FIELD_EN */
 	cx25821_i2c_write(&dev->i2c_bus[0], out_ctrl, value);

 	value = cx25821_i2c_read(&dev->i2c_bus[0], out_ctrl_ns, &tmp);
 	value &= 0xFFFFFF7F;
 	if (enable)
 		value |= 0x00000080;	/* set BLUE_FIELD_EN */
 	cx25821_i2c_write(&dev->i2c_bus[0], out_ctrl_ns, value);
 }

 static int medusa_initialize_ntsc(struct cx25821_dev *dev)
 {
 	int ret_val = 0;
 	int i = 0;
 	u32 value = 0;
 	u32 tmp = 0;

 	for (i = 0; i < MAX_DECODERS; i++) {
 		/* set video format NTSC-M */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				MODE_CTRL + (0x200 * i), &tmp);
 		value &= 0xFFFFFFF0;
 		/* enable the fast locking mode bit[16] */
 		value |= 0x10001;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				MODE_CTRL + (0x200 * i), value);

 		/* resolution NTSC 720x480 */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				HORIZ_TIM_CTRL + (0x200 * i), &tmp);
 		value &= 0x00C00C00;
 		value |= 0x612D0074;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				HORIZ_TIM_CTRL + (0x200 * i), value);

 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				VERT_TIM_CTRL + (0x200 * i), &tmp);
 		value &= 0x00C00C00;
 		value |= 0x1C1E001A;	/* vblank_cnt + 2 to get camera ID */
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				VERT_TIM_CTRL + (0x200 * i), value);

 		/* chroma subcarrier step size */
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				SC_STEP_SIZE + (0x200 * i), 0x43E00000);

 		/* enable VIP optional active */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				OUT_CTRL_NS + (0x200 * i), &tmp);
 		value &= 0xFFFBFFFF;
 		value |= 0x00040000;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				OUT_CTRL_NS + (0x200 * i), value);

 		/* enable VIP optional active (VIP_OPT_AL) for direct output. */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				OUT_CTRL1 + (0x200 * i), &tmp);
 		value &= 0xFFFBFFFF;
 		value |= 0x00040000;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				OUT_CTRL1 + (0x200 * i), value);

 		/*
 		 * clear VPRES_VERT_EN bit, fixes the chroma run away problem
 		 * when the input switching rate < 16 fields
 		*/
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				MISC_TIM_CTRL + (0x200 * i), &tmp);
 		/* disable special play detection */
 		value = setBitAtPos(value, 14);
 		value = clearBitAtPos(value, 15);
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				MISC_TIM_CTRL + (0x200 * i), value);

 		/* set vbi_gate_en to 0 */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DFE_CTRL1 + (0x200 * i), &tmp);
 		value = clearBitAtPos(value, 29);
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DFE_CTRL1 + (0x200 * i), value);

 		/* Enable the generation of blue field output if no video */
 		medusa_enable_bluefield_output(dev, i, 1);
 	}

 	for (i = 0; i < MAX_ENCODERS; i++) {
 		/* NTSC hclock */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_1 + (0x100 * i), &tmp);
 		value &= 0xF000FC00;
 		value |= 0x06B402D0;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_1 + (0x100 * i), value);

 		/* burst begin and burst end */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_2 + (0x100 * i), &tmp);
 		value &= 0xFF000000;
 		value |= 0x007E9054;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_2 + (0x100 * i), value);

 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_3 + (0x100 * i), &tmp);
 		value &= 0xFC00FE00;
 		value |= 0x00EC00F0;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_3 + (0x100 * i), value);

 		/* set NTSC vblank, no phase alternation, 7.5 IRE pedestal */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_4 + (0x100 * i), &tmp);
 		value &= 0x00FCFFFF;
 		value |= 0x13020000;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_4 + (0x100 * i), value);

 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_5 + (0x100 * i), &tmp);
 		value &= 0xFFFF0000;
 		value |= 0x0000E575;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_5 + (0x100 * i), value);

 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_6 + (0x100 * i), 0x009A89C1);

 		/* Subcarrier Increment */
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_7 + (0x100 * i), 0x21F07C1F);
 	}

 	/* set picture resolutions */
 	/* 0 - 720 */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], HSCALE_CTRL, 0x0);
 	/* 0 - 480 */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], VSCALE_CTRL, 0x0);

 	/* set Bypass input format to NTSC 525 lines */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], BYP_AB_CTRL, &tmp);
 	value |= 0x00080200;
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], BYP_AB_CTRL, value);

 	return ret_val;
 }

 static int medusa_PALCombInit(struct cx25821_dev *dev, int dec)
 {
 	int ret_val = -1;
 	u32 value = 0, tmp = 0;

 	/* Setup for 2D threshold */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 			COMB_2D_HFS_CFG + (0x200 * dec), 0x20002861);
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 			COMB_2D_HFD_CFG + (0x200 * dec), 0x20002861);
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 			COMB_2D_LF_CFG + (0x200 * dec), 0x200A1023);

 	/* Setup flat chroma and luma thresholds */
 	value = cx25821_i2c_read(&dev->i2c_bus[0],
 			COMB_FLAT_THRESH_CTRL + (0x200 * dec), &tmp);
 	value &= 0x06230000;
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 			COMB_FLAT_THRESH_CTRL + (0x200 * dec), value);

 	/* set comb 2D blend */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 			COMB_2D_BLEND + (0x200 * dec), 0x210F0F0F);

 	/* COMB MISC CONTROL */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 			COMB_MISC_CTRL + (0x200 * dec), 0x41120A7F);

 	return ret_val;
 }

 static int medusa_initialize_pal(struct cx25821_dev *dev)
 {
 	int ret_val = 0;
 	int i = 0;
 	u32 value = 0;
 	u32 tmp = 0;

 	for (i = 0; i < MAX_DECODERS; i++) {
 		/* set video format PAL-BDGHI */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				MODE_CTRL + (0x200 * i), &tmp);
 		value &= 0xFFFFFFF0;
 		/* enable the fast locking mode bit[16] */
 		value |= 0x10004;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				MODE_CTRL + (0x200 * i), value);

 		/* resolution PAL 720x576 */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				HORIZ_TIM_CTRL + (0x200 * i), &tmp);
 		value &= 0x00C00C00;
 		value |= 0x632D007D;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				HORIZ_TIM_CTRL + (0x200 * i), value);

 		/* vblank656_cnt=x26, vactive_cnt=240h, vblank_cnt=x24 */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				VERT_TIM_CTRL + (0x200 * i), &tmp);
 		value &= 0x00C00C00;
 		value |= 0x28240026;	/* vblank_cnt + 2 to get camera ID */
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				VERT_TIM_CTRL + (0x200 * i), value);

 		/* chroma subcarrier step size */
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				SC_STEP_SIZE + (0x200 * i), 0x5411E2D0);

 		/* enable VIP optional active */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				OUT_CTRL_NS + (0x200 * i), &tmp);
 		value &= 0xFFFBFFFF;
 		value |= 0x00040000;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				OUT_CTRL_NS + (0x200 * i), value);

 		/* enable VIP optional active (VIP_OPT_AL) for direct output. */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				OUT_CTRL1 + (0x200 * i), &tmp);
 		value &= 0xFFFBFFFF;
 		value |= 0x00040000;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				OUT_CTRL1 + (0x200 * i), value);

 		/*
 		 * clear VPRES_VERT_EN bit, fixes the chroma run away problem
 		 * when the input switching rate < 16 fields
 		 */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				MISC_TIM_CTRL + (0x200 * i), &tmp);
 		/* disable special play detection */
 		value = setBitAtPos(value, 14);
 		value = clearBitAtPos(value, 15);
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				MISC_TIM_CTRL + (0x200 * i), value);

 		/* set vbi_gate_en to 0 */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DFE_CTRL1 + (0x200 * i), &tmp);
 		value = clearBitAtPos(value, 29);
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DFE_CTRL1 + (0x200 * i), value);

 		medusa_PALCombInit(dev, i);

 		/* Enable the generation of blue field output if no video */
 		medusa_enable_bluefield_output(dev, i, 1);
 	}

 	for (i = 0; i < MAX_ENCODERS; i++) {
 		/* PAL hclock */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_1 + (0x100 * i), &tmp);
 		value &= 0xF000FC00;
 		value |= 0x06C002D0;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_1 + (0x100 * i), value);

 		/* burst begin and burst end */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_2 + (0x100 * i), &tmp);
 		value &= 0xFF000000;
 		value |= 0x007E9754;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_2 + (0x100 * i), value);

 		/* hblank and vactive */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_3 + (0x100 * i), &tmp);
 		value &= 0xFC00FE00;
 		value |= 0x00FC0120;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_3 + (0x100 * i), value);

 		/* set PAL vblank, phase alternation, 0 IRE pedestal */
 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_4 + (0x100 * i), &tmp);
 		value &= 0x00FCFFFF;
 		value |= 0x14010000;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_4 + (0x100 * i), value);

 		value = cx25821_i2c_read(&dev->i2c_bus[0],
 				DENC_A_REG_5 + (0x100 * i), &tmp);
 		value &= 0xFFFF0000;
 		value |= 0x0000F078;
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_5 + (0x100 * i), value);

 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_6 + (0x100 * i), 0x00A493CF);

 		/* Subcarrier Increment */
 		ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
 				DENC_A_REG_7 + (0x100 * i), 0x2A098ACB);
 	}

 	/* set picture resolutions */
 	/* 0 - 720 */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], HSCALE_CTRL, 0x0);
 	/* 0 - 576 */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], VSCALE_CTRL, 0x0);

 	/* set Bypass input format to PAL 625 lines */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], BYP_AB_CTRL, &tmp);
 	value &= 0xFFF7FDFF;
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], BYP_AB_CTRL, value);

 	return ret_val;
 }

 int medusa_set_videostandard(struct cx25821_dev *dev)
 {
 	int status = 0;
 	u32 value = 0, tmp = 0;

 	if (dev->tvnorm & V4L2_STD_PAL_BG || dev->tvnorm & V4L2_STD_PAL_DK)
 		status = medusa_initialize_pal(dev);
 	else
 		status = medusa_initialize_ntsc(dev);

 	/* Enable DENC_A output */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], DENC_A_REG_4, &tmp);
 	value = setBitAtPos(value, 4);
 	status = cx25821_i2c_write(&dev->i2c_bus[0], DENC_A_REG_4, value);

 	/* Enable DENC_B output */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], DENC_B_REG_4, &tmp);
 	value = setBitAtPos(value, 4);
 	status = cx25821_i2c_write(&dev->i2c_bus[0], DENC_B_REG_4, value);

 	return status;
 }

 void medusa_set_resolution(struct cx25821_dev *dev, int width,
 			   int decoder_select)
 {
 	int decoder = 0;
 	int decoder_count = 0;
 	u32 hscale = 0x0;
 	u32 vscale = 0x0;
 	const int MAX_WIDTH = 720;

 	/* validate the width */
 	if (width > MAX_WIDTH) {
 		pr_info("%s(): width %d > MAX_WIDTH %d ! resetting to MAX_WIDTH\n",
 			__func__, width, MAX_WIDTH);
 		width = MAX_WIDTH;
 	}

 	if (decoder_select <= 7 && decoder_select >= 0) {
 		decoder = decoder_select;
 		decoder_count = decoder_select + 1;
 	} else {
 		decoder = 0;
 		decoder_count = dev->_max_num_decoders;
 	}

 	switch (width) {
 	case 320:
 		hscale = 0x13E34B;
 		vscale = 0x0;
 		break;

 	case 352:
 		hscale = 0x10A273;
 		vscale = 0x0;
 		break;

 	case 176:
 		hscale = 0x3115B2;
 		vscale = 0x1E00;
 		break;

 	case 160:
 		hscale = 0x378D84;
 		vscale = 0x1E00;
 		break;

 	default:		/* 720 */
 		hscale = 0x0;
 		vscale = 0x0;
 		break;
 	}

 	for (; decoder < decoder_count; decoder++) {
 		/* write scaling values for each decoder */
 		cx25821_i2c_write(&dev->i2c_bus[0],
 				HSCALE_CTRL + (0x200 * decoder), hscale);
 		cx25821_i2c_write(&dev->i2c_bus[0],
 				VSCALE_CTRL + (0x200 * decoder), vscale);
 	}
 }

 static void medusa_set_decoderduration(struct cx25821_dev *dev, int decoder,
 				       int duration)
 {
 	u32 fld_cnt = 0;
 	u32 tmp = 0;
 	u32 disp_cnt_reg = DISP_AB_CNT;

 	/* no support */
 	if (decoder < VDEC_A || decoder > VDEC_H) {
 		return;
 	}

 	switch (decoder) {
 	default:
 		break;
 	case VDEC_C:
 	case VDEC_D:
 		disp_cnt_reg = DISP_CD_CNT;
 		break;
 	case VDEC_E:
 	case VDEC_F:
 		disp_cnt_reg = DISP_EF_CNT;
 		break;
 	case VDEC_G:
 	case VDEC_H:
 		disp_cnt_reg = DISP_GH_CNT;
 		break;
 	}

 	/* update hardware */
 	fld_cnt = cx25821_i2c_read(&dev->i2c_bus[0], disp_cnt_reg, &tmp);

 	if (!(decoder % 2)) {	/* EVEN decoder */
 		fld_cnt &= 0xFFFF0000;
 		fld_cnt |= duration;
 	} else {
 		fld_cnt &= 0x0000FFFF;
 		fld_cnt |= ((u32) duration) << 16;
 	}

 	cx25821_i2c_write(&dev->i2c_bus[0], disp_cnt_reg, fld_cnt);
 }

 /* Map to Medusa register setting */
 static int mapM(int srcMin, int srcMax, int srcVal, int dstMin, int dstMax,
 		int *dstVal)
 {
 	int numerator;
 	int denominator;
 	int quotient;

 	if ((srcMin == srcMax) || (srcVal < srcMin) || (srcVal > srcMax))
 		return -1;
 	/*
 	 * This is the overall expression used:
 	 * *dstVal =
 	 *   (srcVal - srcMin)*(dstMax - dstMin) / (srcMax - srcMin) + dstMin;
 	 * but we need to account for rounding so below we use the modulus
 	 * operator to find the remainder and increment if necessary.
 	 */
 	numerator = (srcVal - srcMin) * (dstMax - dstMin);
 	denominator = srcMax - srcMin;
 	quotient = numerator / denominator;

 	if (2 * (numerator % denominator) >= denominator)
 		quotient++;

 	*dstVal = quotient + dstMin;

 	return 0;
 }

 static unsigned long convert_to_twos(long numeric, unsigned long bits_len)
 {
 	unsigned char temp;

 	if (numeric >= 0)
 		return numeric;
 	else {
 		temp = ~(abs(numeric) & 0xFF);
 		temp += 1;
 		return temp;
 	}
 }

 int medusa_set_brightness(struct cx25821_dev *dev, int brightness, int decoder)
 {
 	int ret_val = 0;
 	int value = 0;
 	u32 val = 0, tmp = 0;

 	if ((brightness > VIDEO_PROCAMP_MAX) ||
 	    (brightness < VIDEO_PROCAMP_MIN)) {
 		return -1;
 	}
 	ret_val = mapM(VIDEO_PROCAMP_MIN, VIDEO_PROCAMP_MAX, brightness,
 			SIGNED_BYTE_MIN, SIGNED_BYTE_MAX, &value);
 	value = convert_to_twos(value, 8);
 	val = cx25821_i2c_read(&dev->i2c_bus[0],
 			VDEC_A_BRITE_CTRL + (0x200 * decoder), &tmp);
 	val &= 0xFFFFFF00;
 	ret_val |= cx25821_i2c_write(&dev->i2c_bus[0],
 			VDEC_A_BRITE_CTRL + (0x200 * decoder), val | value);
 	return ret_val;
 }

 int medusa_set_contrast(struct cx25821_dev *dev, int contrast, int decoder)
 {
 	int ret_val = 0;
 	int value = 0;
 	u32 val = 0, tmp = 0;

 	if ((contrast > VIDEO_PROCAMP_MAX) || (contrast < VIDEO_PROCAMP_MIN)) {
 		return -1;
 	}

 	ret_val = mapM(VIDEO_PROCAMP_MIN, VIDEO_PROCAMP_MAX, contrast,
 			UNSIGNED_BYTE_MIN, UNSIGNED_BYTE_MAX, &value);
 	val = cx25821_i2c_read(&dev->i2c_bus[0],
 			VDEC_A_CNTRST_CTRL + (0x200 * decoder), &tmp);
 	val &= 0xFFFFFF00;
 	ret_val |= cx25821_i2c_write(&dev->i2c_bus[0],
 			VDEC_A_CNTRST_CTRL + (0x200 * decoder), val | value);

 	return ret_val;
 }

 int medusa_set_hue(struct cx25821_dev *dev, int hue, int decoder)
 {
 	int ret_val = 0;
 	int value = 0;
 	u32 val = 0, tmp = 0;

 	if ((hue > VIDEO_PROCAMP_MAX) || (hue < VIDEO_PROCAMP_MIN)) {
 		return -1;
 	}

 	ret_val = mapM(VIDEO_PROCAMP_MIN, VIDEO_PROCAMP_MAX, hue,
 			SIGNED_BYTE_MIN, SIGNED_BYTE_MAX, &value);

 	value = convert_to_twos(value, 8);
 	val = cx25821_i2c_read(&dev->i2c_bus[0],
 			VDEC_A_HUE_CTRL + (0x200 * decoder), &tmp);
 	val &= 0xFFFFFF00;

 	ret_val |= cx25821_i2c_write(&dev->i2c_bus[0],
 			VDEC_A_HUE_CTRL + (0x200 * decoder), val | value);

 	return ret_val;
 }

 int medusa_set_saturation(struct cx25821_dev *dev, int saturation, int decoder)
 {
 	int ret_val = 0;
 	int value = 0;
 	u32 val = 0, tmp = 0;

 	if ((saturation > VIDEO_PROCAMP_MAX) ||
 	    (saturation < VIDEO_PROCAMP_MIN)) {
 		return -1;
 	}

 	ret_val = mapM(VIDEO_PROCAMP_MIN, VIDEO_PROCAMP_MAX, saturation,
 			UNSIGNED_BYTE_MIN, UNSIGNED_BYTE_MAX, &value);

 	val = cx25821_i2c_read(&dev->i2c_bus[0],
 			VDEC_A_USAT_CTRL + (0x200 * decoder), &tmp);
 	val &= 0xFFFFFF00;
 	ret_val |= cx25821_i2c_write(&dev->i2c_bus[0],
 			VDEC_A_USAT_CTRL + (0x200 * decoder), val | value);

 	val = cx25821_i2c_read(&dev->i2c_bus[0],
 			VDEC_A_VSAT_CTRL + (0x200 * decoder), &tmp);
 	val &= 0xFFFFFF00;
 	ret_val |= cx25821_i2c_write(&dev->i2c_bus[0],
 			VDEC_A_VSAT_CTRL + (0x200 * decoder), val | value);

 	return ret_val;
 }

 /* Program the display sequence and monitor output. */

 int medusa_video_init(struct cx25821_dev *dev)
 {
 	u32 value = 0, tmp = 0;
 	int ret_val = 0;
 	int i = 0;

 	/* disable Auto source selection on all video decoders */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], MON_A_CTRL, &tmp);
 	value &= 0xFFFFF0FF;
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], MON_A_CTRL, value);

 	if (ret_val < 0)
 		goto error;

 	/* Turn off Master source switch enable */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], MON_A_CTRL, &tmp);
 	value &= 0xFFFFFFDF;
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], MON_A_CTRL, value);

 	if (ret_val < 0)
 		goto error;

 	/*
 	 * FIXME: due to a coding bug the duration was always 0. It's
 	 * likely that it really should be something else, but due to the
 	 * lack of documentation I have no idea what it should be. For
 	 * now just fill in 0 as the duration.
 	 */
 	for (i = 0; i < dev->_max_num_decoders; i++)
 		medusa_set_decoderduration(dev, i, 0);

 	/* Select monitor as DENC A input, power up the DAC */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], DENC_AB_CTRL, &tmp);
 	value &= 0xFF70FF70;
 	value |= 0x00090008;	/* set en_active */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], DENC_AB_CTRL, value);

 	if (ret_val < 0)
 		goto error;

 	/* enable input is VIP/656 */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], BYP_AB_CTRL, &tmp);
 	value |= 0x00040100;	/* enable VIP */
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], BYP_AB_CTRL, value);

 	if (ret_val < 0)
 		goto error;

 	/* select AFE clock to output mode */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], AFE_AB_DIAG_CTRL, &tmp);
 	value &= 0x83FFFFFF;
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], AFE_AB_DIAG_CTRL,
 			value | 0x10000000);

 	if (ret_val < 0)
 		goto error;

 	/* Turn on all of the data out and control output pins. */
 	value = cx25821_i2c_read(&dev->i2c_bus[0], PIN_OE_CTRL, &tmp);
 	value &= 0xFEF0FE00;
 	if (dev->_max_num_decoders == MAX_DECODERS) {
 		/*
 		 * Note: The octal board does not support control pins(bit16-19)
 		 * These bits are ignored in the octal board.
 		 *
 		 * disable VDEC A-C port, default to Mobilygen Interface
 		 */
 		value |= 0x010001F8;
 	} else {
 		/* disable VDEC A-C port, default to Mobilygen Interface */
 		value |= 0x010F0108;
 	}

 	value |= 7;
 	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], PIN_OE_CTRL, value);

 	if (ret_val < 0)
 		goto error;

 	ret_val = medusa_set_videostandard(dev);

 error:
 	return ret_val;
 }
	/*
	* Driver for the Conexant CX25821 PCIe bridge
	*
	* Copyright (C) 2009 Conexant Systems Inc.
	* Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
	*
	* 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.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include "cx25821.h"
	#include "cx25821-medusa-video.h"
	#include "cx25821-biffuncs.h"

	/*
	* medusa_enable_bluefield_output()
	*
	* Enable the generation of blue filed output if no video
	*
	*/
	static void medusa_enable_bluefield_output(struct cx25821_dev *dev, int channel,
	int enable)
	{
	u32 value = 0;
	u32 tmp = 0;
	int out_ctrl = OUT_CTRL1;
	int out_ctrl_ns = OUT_CTRL_NS;

	switch (channel) {
	default:
	case VDEC_A:
	break;
	case VDEC_B:
	out_ctrl = VDEC_B_OUT_CTRL1;
	out_ctrl_ns = VDEC_B_OUT_CTRL_NS;
	break;
	case VDEC_C:
	out_ctrl = VDEC_C_OUT_CTRL1;
	out_ctrl_ns = VDEC_C_OUT_CTRL_NS;
	break;
	case VDEC_D:
	out_ctrl = VDEC_D_OUT_CTRL1;
	out_ctrl_ns = VDEC_D_OUT_CTRL_NS;
	break;
	case VDEC_E:
	out_ctrl = VDEC_E_OUT_CTRL1;
	out_ctrl_ns = VDEC_E_OUT_CTRL_NS;
	return;
	case VDEC_F:
	out_ctrl = VDEC_F_OUT_CTRL1;
	out_ctrl_ns = VDEC_F_OUT_CTRL_NS;
	return;
	case VDEC_G:
	out_ctrl = VDEC_G_OUT_CTRL1;
	out_ctrl_ns = VDEC_G_OUT_CTRL_NS;
	return;
	case VDEC_H:
	out_ctrl = VDEC_H_OUT_CTRL1;
	out_ctrl_ns = VDEC_H_OUT_CTRL_NS;
	return;
	}

	value = cx25821_i2c_read(&dev->i2c_bus[0], out_ctrl, &tmp);
	value &= 0xFFFFFF7F; /* clear BLUE_FIELD_EN */
	if (enable)
	value \|= 0x00000080; /* set BLUE_FIELD_EN */
	cx25821_i2c_write(&dev->i2c_bus[0], out_ctrl, value);

	value = cx25821_i2c_read(&dev->i2c_bus[0], out_ctrl_ns, &tmp);
	value &= 0xFFFFFF7F;
	if (enable)
	value \|= 0x00000080; /* set BLUE_FIELD_EN */
	cx25821_i2c_write(&dev->i2c_bus[0], out_ctrl_ns, value);
	}

	static int medusa_initialize_ntsc(struct cx25821_dev *dev)
	{
	int ret_val = 0;
	int i = 0;
	u32 value = 0;
	u32 tmp = 0;

	for (i = 0; i < MAX_DECODERS; i++) {
	/* set video format NTSC-M */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	MODE_CTRL + (0x200 * i), &tmp);
	value &= 0xFFFFFFF0;
	/* enable the fast locking mode bit[16] */
	value \|= 0x10001;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	MODE_CTRL + (0x200 * i), value);

	/* resolution NTSC 720x480 */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	HORIZ_TIM_CTRL + (0x200 * i), &tmp);
	value &= 0x00C00C00;
	value \|= 0x612D0074;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	HORIZ_TIM_CTRL + (0x200 * i), value);

	value = cx25821_i2c_read(&dev->i2c_bus[0],
	VERT_TIM_CTRL + (0x200 * i), &tmp);
	value &= 0x00C00C00;
	value \|= 0x1C1E001A; /* vblank_cnt + 2 to get camera ID */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	VERT_TIM_CTRL + (0x200 * i), value);

	/* chroma subcarrier step size */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	SC_STEP_SIZE + (0x200 * i), 0x43E00000);

	/* enable VIP optional active */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	OUT_CTRL_NS + (0x200 * i), &tmp);
	value &= 0xFFFBFFFF;
	value \|= 0x00040000;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	OUT_CTRL_NS + (0x200 * i), value);

	/* enable VIP optional active (VIP_OPT_AL) for direct output. */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	OUT_CTRL1 + (0x200 * i), &tmp);
	value &= 0xFFFBFFFF;
	value \|= 0x00040000;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	OUT_CTRL1 + (0x200 * i), value);

	/*
	* clear VPRES_VERT_EN bit, fixes the chroma run away problem
	* when the input switching rate < 16 fields
	*/
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	MISC_TIM_CTRL + (0x200 * i), &tmp);
	/* disable special play detection */
	value = setBitAtPos(value, 14);
	value = clearBitAtPos(value, 15);
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	MISC_TIM_CTRL + (0x200 * i), value);

	/* set vbi_gate_en to 0 */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DFE_CTRL1 + (0x200 * i), &tmp);
	value = clearBitAtPos(value, 29);
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DFE_CTRL1 + (0x200 * i), value);

	/* Enable the generation of blue field output if no video */
	medusa_enable_bluefield_output(dev, i, 1);
	}

	for (i = 0; i < MAX_ENCODERS; i++) {
	/* NTSC hclock */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_1 + (0x100 * i), &tmp);
	value &= 0xF000FC00;
	value \|= 0x06B402D0;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_1 + (0x100 * i), value);

	/* burst begin and burst end */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_2 + (0x100 * i), &tmp);
	value &= 0xFF000000;
	value \|= 0x007E9054;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_2 + (0x100 * i), value);

	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_3 + (0x100 * i), &tmp);
	value &= 0xFC00FE00;
	value \|= 0x00EC00F0;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_3 + (0x100 * i), value);

	/* set NTSC vblank, no phase alternation, 7.5 IRE pedestal */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_4 + (0x100 * i), &tmp);
	value &= 0x00FCFFFF;
	value \|= 0x13020000;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_4 + (0x100 * i), value);

	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_5 + (0x100 * i), &tmp);
	value &= 0xFFFF0000;
	value \|= 0x0000E575;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_5 + (0x100 * i), value);

	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_6 + (0x100 * i), 0x009A89C1);

	/* Subcarrier Increment */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_7 + (0x100 * i), 0x21F07C1F);
	}

	/* set picture resolutions */
	/* 0 - 720 */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], HSCALE_CTRL, 0x0);
	/* 0 - 480 */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], VSCALE_CTRL, 0x0);

	/* set Bypass input format to NTSC 525 lines */
	value = cx25821_i2c_read(&dev->i2c_bus[0], BYP_AB_CTRL, &tmp);
	value \|= 0x00080200;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], BYP_AB_CTRL, value);

	return ret_val;
	}

	static int medusa_PALCombInit(struct cx25821_dev *dev, int dec)
	{
	int ret_val = -1;
	u32 value = 0, tmp = 0;

	/* Setup for 2D threshold */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	COMB_2D_HFS_CFG + (0x200 * dec), 0x20002861);
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	COMB_2D_HFD_CFG + (0x200 * dec), 0x20002861);
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	COMB_2D_LF_CFG + (0x200 * dec), 0x200A1023);

	/* Setup flat chroma and luma thresholds */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	COMB_FLAT_THRESH_CTRL + (0x200 * dec), &tmp);
	value &= 0x06230000;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	COMB_FLAT_THRESH_CTRL + (0x200 * dec), value);

	/* set comb 2D blend */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	COMB_2D_BLEND + (0x200 * dec), 0x210F0F0F);

	/* COMB MISC CONTROL */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	COMB_MISC_CTRL + (0x200 * dec), 0x41120A7F);

	return ret_val;
	}

	static int medusa_initialize_pal(struct cx25821_dev *dev)
	{
	int ret_val = 0;
	int i = 0;
	u32 value = 0;
	u32 tmp = 0;

	for (i = 0; i < MAX_DECODERS; i++) {
	/* set video format PAL-BDGHI */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	MODE_CTRL + (0x200 * i), &tmp);
	value &= 0xFFFFFFF0;
	/* enable the fast locking mode bit[16] */
	value \|= 0x10004;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	MODE_CTRL + (0x200 * i), value);

	/* resolution PAL 720x576 */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	HORIZ_TIM_CTRL + (0x200 * i), &tmp);
	value &= 0x00C00C00;
	value \|= 0x632D007D;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	HORIZ_TIM_CTRL + (0x200 * i), value);

	/* vblank656_cnt=x26, vactive_cnt=240h, vblank_cnt=x24 */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	VERT_TIM_CTRL + (0x200 * i), &tmp);
	value &= 0x00C00C00;
	value \|= 0x28240026; /* vblank_cnt + 2 to get camera ID */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	VERT_TIM_CTRL + (0x200 * i), value);

	/* chroma subcarrier step size */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	SC_STEP_SIZE + (0x200 * i), 0x5411E2D0);

	/* enable VIP optional active */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	OUT_CTRL_NS + (0x200 * i), &tmp);
	value &= 0xFFFBFFFF;
	value \|= 0x00040000;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	OUT_CTRL_NS + (0x200 * i), value);

	/* enable VIP optional active (VIP_OPT_AL) for direct output. */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	OUT_CTRL1 + (0x200 * i), &tmp);
	value &= 0xFFFBFFFF;
	value \|= 0x00040000;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	OUT_CTRL1 + (0x200 * i), value);

	/*
	* clear VPRES_VERT_EN bit, fixes the chroma run away problem
	* when the input switching rate < 16 fields
	*/
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	MISC_TIM_CTRL + (0x200 * i), &tmp);
	/* disable special play detection */
	value = setBitAtPos(value, 14);
	value = clearBitAtPos(value, 15);
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	MISC_TIM_CTRL + (0x200 * i), value);

	/* set vbi_gate_en to 0 */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DFE_CTRL1 + (0x200 * i), &tmp);
	value = clearBitAtPos(value, 29);
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DFE_CTRL1 + (0x200 * i), value);

	medusa_PALCombInit(dev, i);

	/* Enable the generation of blue field output if no video */
	medusa_enable_bluefield_output(dev, i, 1);
	}

	for (i = 0; i < MAX_ENCODERS; i++) {
	/* PAL hclock */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_1 + (0x100 * i), &tmp);
	value &= 0xF000FC00;
	value \|= 0x06C002D0;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_1 + (0x100 * i), value);

	/* burst begin and burst end */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_2 + (0x100 * i), &tmp);
	value &= 0xFF000000;
	value \|= 0x007E9754;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_2 + (0x100 * i), value);

	/* hblank and vactive */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_3 + (0x100 * i), &tmp);
	value &= 0xFC00FE00;
	value \|= 0x00FC0120;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_3 + (0x100 * i), value);

	/* set PAL vblank, phase alternation, 0 IRE pedestal */
	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_4 + (0x100 * i), &tmp);
	value &= 0x00FCFFFF;
	value \|= 0x14010000;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_4 + (0x100 * i), value);

	value = cx25821_i2c_read(&dev->i2c_bus[0],
	DENC_A_REG_5 + (0x100 * i), &tmp);
	value &= 0xFFFF0000;
	value \|= 0x0000F078;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_5 + (0x100 * i), value);

	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_6 + (0x100 * i), 0x00A493CF);

	/* Subcarrier Increment */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0],
	DENC_A_REG_7 + (0x100 * i), 0x2A098ACB);
	}

	/* set picture resolutions */
	/* 0 - 720 */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], HSCALE_CTRL, 0x0);
	/* 0 - 576 */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], VSCALE_CTRL, 0x0);

	/* set Bypass input format to PAL 625 lines */
	value = cx25821_i2c_read(&dev->i2c_bus[0], BYP_AB_CTRL, &tmp);
	value &= 0xFFF7FDFF;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], BYP_AB_CTRL, value);

	return ret_val;
	}

	int medusa_set_videostandard(struct cx25821_dev *dev)
	{
	int status = 0;
	u32 value = 0, tmp = 0;

	if (dev->tvnorm & V4L2_STD_PAL_BG \|\| dev->tvnorm & V4L2_STD_PAL_DK)
	status = medusa_initialize_pal(dev);
	else
	status = medusa_initialize_ntsc(dev);

	/* Enable DENC_A output */
	value = cx25821_i2c_read(&dev->i2c_bus[0], DENC_A_REG_4, &tmp);
	value = setBitAtPos(value, 4);
	status = cx25821_i2c_write(&dev->i2c_bus[0], DENC_A_REG_4, value);

	/* Enable DENC_B output */
	value = cx25821_i2c_read(&dev->i2c_bus[0], DENC_B_REG_4, &tmp);
	value = setBitAtPos(value, 4);
	status = cx25821_i2c_write(&dev->i2c_bus[0], DENC_B_REG_4, value);

	return status;
	}

	void medusa_set_resolution(struct cx25821_dev *dev, int width,
	int decoder_select)
	{
	int decoder = 0;
	int decoder_count = 0;
	u32 hscale = 0x0;
	u32 vscale = 0x0;
	const int MAX_WIDTH = 720;

	/* validate the width */
	if (width > MAX_WIDTH) {
	pr_info("%s(): width %d > MAX_WIDTH %d ! resetting to MAX_WIDTH\n",
	__func__, width, MAX_WIDTH);
	width = MAX_WIDTH;
	}

	if (decoder_select <= 7 && decoder_select >= 0) {
	decoder = decoder_select;
	decoder_count = decoder_select + 1;
	} else {
	decoder = 0;
	decoder_count = dev->_max_num_decoders;
	}

	switch (width) {
	case 320:
	hscale = 0x13E34B;
	vscale = 0x0;
	break;

	case 352:
	hscale = 0x10A273;
	vscale = 0x0;
	break;

	case 176:
	hscale = 0x3115B2;
	vscale = 0x1E00;
	break;

	case 160:
	hscale = 0x378D84;
	vscale = 0x1E00;
	break;

	default: /* 720 */
	hscale = 0x0;
	vscale = 0x0;
	break;
	}

	for (; decoder < decoder_count; decoder++) {
	/* write scaling values for each decoder */
	cx25821_i2c_write(&dev->i2c_bus[0],
	HSCALE_CTRL + (0x200 * decoder), hscale);
	cx25821_i2c_write(&dev->i2c_bus[0],
	VSCALE_CTRL + (0x200 * decoder), vscale);
	}
	}

	static void medusa_set_decoderduration(struct cx25821_dev *dev, int decoder,
	int duration)
	{
	u32 fld_cnt = 0;
	u32 tmp = 0;
	u32 disp_cnt_reg = DISP_AB_CNT;

	/* no support */
	if (decoder < VDEC_A \|\| decoder > VDEC_H) {
	return;
	}

	switch (decoder) {
	default:
	break;
	case VDEC_C:
	case VDEC_D:
	disp_cnt_reg = DISP_CD_CNT;
	break;
	case VDEC_E:
	case VDEC_F:
	disp_cnt_reg = DISP_EF_CNT;
	break;
	case VDEC_G:
	case VDEC_H:
	disp_cnt_reg = DISP_GH_CNT;
	break;
	}

	/* update hardware */
	fld_cnt = cx25821_i2c_read(&dev->i2c_bus[0], disp_cnt_reg, &tmp);

	if (!(decoder % 2)) { /* EVEN decoder */
	fld_cnt &= 0xFFFF0000;
	fld_cnt \|= duration;
	} else {
	fld_cnt &= 0x0000FFFF;
	fld_cnt \|= ((u32) duration) << 16;
	}

	cx25821_i2c_write(&dev->i2c_bus[0], disp_cnt_reg, fld_cnt);
	}

	/* Map to Medusa register setting */
	static int mapM(int srcMin, int srcMax, int srcVal, int dstMin, int dstMax,
	int *dstVal)
	{
	int numerator;
	int denominator;
	int quotient;

	if ((srcMin == srcMax) \|\| (srcVal < srcMin) \|\| (srcVal > srcMax))
	return -1;
	/*
	* This is the overall expression used:
	* *dstVal =
	* (srcVal - srcMin)*(dstMax - dstMin) / (srcMax - srcMin) + dstMin;
	* but we need to account for rounding so below we use the modulus
	* operator to find the remainder and increment if necessary.
	*/
	numerator = (srcVal - srcMin) * (dstMax - dstMin);
	denominator = srcMax - srcMin;
	quotient = numerator / denominator;

	if (2 * (numerator % denominator) >= denominator)
	quotient++;

	*dstVal = quotient + dstMin;

	return 0;
	}

	static unsigned long convert_to_twos(long numeric, unsigned long bits_len)
	{
	unsigned char temp;

	if (numeric >= 0)
	return numeric;
	else {
	temp = ~(abs(numeric) & 0xFF);
	temp += 1;
	return temp;
	}
	}

	int medusa_set_brightness(struct cx25821_dev *dev, int brightness, int decoder)
	{
	int ret_val = 0;
	int value = 0;
	u32 val = 0, tmp = 0;

	if ((brightness > VIDEO_PROCAMP_MAX) \|\|
	(brightness < VIDEO_PROCAMP_MIN)) {
	return -1;
	}
	ret_val = mapM(VIDEO_PROCAMP_MIN, VIDEO_PROCAMP_MAX, brightness,
	SIGNED_BYTE_MIN, SIGNED_BYTE_MAX, &value);
	value = convert_to_twos(value, 8);
	val = cx25821_i2c_read(&dev->i2c_bus[0],
	VDEC_A_BRITE_CTRL + (0x200 * decoder), &tmp);
	val &= 0xFFFFFF00;
	ret_val \|= cx25821_i2c_write(&dev->i2c_bus[0],
	VDEC_A_BRITE_CTRL + (0x200 * decoder), val \| value);
	return ret_val;
	}

	int medusa_set_contrast(struct cx25821_dev *dev, int contrast, int decoder)
	{
	int ret_val = 0;
	int value = 0;
	u32 val = 0, tmp = 0;

	if ((contrast > VIDEO_PROCAMP_MAX) \|\| (contrast < VIDEO_PROCAMP_MIN)) {
	return -1;
	}

	ret_val = mapM(VIDEO_PROCAMP_MIN, VIDEO_PROCAMP_MAX, contrast,
	UNSIGNED_BYTE_MIN, UNSIGNED_BYTE_MAX, &value);
	val = cx25821_i2c_read(&dev->i2c_bus[0],
	VDEC_A_CNTRST_CTRL + (0x200 * decoder), &tmp);
	val &= 0xFFFFFF00;
	ret_val \|= cx25821_i2c_write(&dev->i2c_bus[0],
	VDEC_A_CNTRST_CTRL + (0x200 * decoder), val \| value);

	return ret_val;
	}

	int medusa_set_hue(struct cx25821_dev *dev, int hue, int decoder)
	{
	int ret_val = 0;
	int value = 0;
	u32 val = 0, tmp = 0;

	if ((hue > VIDEO_PROCAMP_MAX) \|\| (hue < VIDEO_PROCAMP_MIN)) {
	return -1;
	}

	ret_val = mapM(VIDEO_PROCAMP_MIN, VIDEO_PROCAMP_MAX, hue,
	SIGNED_BYTE_MIN, SIGNED_BYTE_MAX, &value);

	value = convert_to_twos(value, 8);
	val = cx25821_i2c_read(&dev->i2c_bus[0],
	VDEC_A_HUE_CTRL + (0x200 * decoder), &tmp);
	val &= 0xFFFFFF00;

	ret_val \|= cx25821_i2c_write(&dev->i2c_bus[0],
	VDEC_A_HUE_CTRL + (0x200 * decoder), val \| value);

	return ret_val;
	}

	int medusa_set_saturation(struct cx25821_dev *dev, int saturation, int decoder)
	{
	int ret_val = 0;
	int value = 0;
	u32 val = 0, tmp = 0;

	if ((saturation > VIDEO_PROCAMP_MAX) \|\|
	(saturation < VIDEO_PROCAMP_MIN)) {
	return -1;
	}

	ret_val = mapM(VIDEO_PROCAMP_MIN, VIDEO_PROCAMP_MAX, saturation,
	UNSIGNED_BYTE_MIN, UNSIGNED_BYTE_MAX, &value);

	val = cx25821_i2c_read(&dev->i2c_bus[0],
	VDEC_A_USAT_CTRL + (0x200 * decoder), &tmp);
	val &= 0xFFFFFF00;
	ret_val \|= cx25821_i2c_write(&dev->i2c_bus[0],
	VDEC_A_USAT_CTRL + (0x200 * decoder), val \| value);

	val = cx25821_i2c_read(&dev->i2c_bus[0],
	VDEC_A_VSAT_CTRL + (0x200 * decoder), &tmp);
	val &= 0xFFFFFF00;
	ret_val \|= cx25821_i2c_write(&dev->i2c_bus[0],
	VDEC_A_VSAT_CTRL + (0x200 * decoder), val \| value);

	return ret_val;
	}

	/* Program the display sequence and monitor output. */

	int medusa_video_init(struct cx25821_dev *dev)
	{
	u32 value = 0, tmp = 0;
	int ret_val = 0;
	int i = 0;

	/* disable Auto source selection on all video decoders */
	value = cx25821_i2c_read(&dev->i2c_bus[0], MON_A_CTRL, &tmp);
	value &= 0xFFFFF0FF;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], MON_A_CTRL, value);

	if (ret_val < 0)
	goto error;

	/* Turn off Master source switch enable */
	value = cx25821_i2c_read(&dev->i2c_bus[0], MON_A_CTRL, &tmp);
	value &= 0xFFFFFFDF;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], MON_A_CTRL, value);

	if (ret_val < 0)
	goto error;

	/*
	* FIXME: due to a coding bug the duration was always 0. It's
	* likely that it really should be something else, but due to the
	* lack of documentation I have no idea what it should be. For
	* now just fill in 0 as the duration.
	*/
	for (i = 0; i < dev->_max_num_decoders; i++)
	medusa_set_decoderduration(dev, i, 0);

	/* Select monitor as DENC A input, power up the DAC */
	value = cx25821_i2c_read(&dev->i2c_bus[0], DENC_AB_CTRL, &tmp);
	value &= 0xFF70FF70;
	value \|= 0x00090008; /* set en_active */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], DENC_AB_CTRL, value);

	if (ret_val < 0)
	goto error;

	/* enable input is VIP/656 */
	value = cx25821_i2c_read(&dev->i2c_bus[0], BYP_AB_CTRL, &tmp);
	value \|= 0x00040100; /* enable VIP */
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], BYP_AB_CTRL, value);

	if (ret_val < 0)
	goto error;

	/* select AFE clock to output mode */
	value = cx25821_i2c_read(&dev->i2c_bus[0], AFE_AB_DIAG_CTRL, &tmp);
	value &= 0x83FFFFFF;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], AFE_AB_DIAG_CTRL,
	value \| 0x10000000);

	if (ret_val < 0)
	goto error;

	/* Turn on all of the data out and control output pins. */
	value = cx25821_i2c_read(&dev->i2c_bus[0], PIN_OE_CTRL, &tmp);
	value &= 0xFEF0FE00;
	if (dev->_max_num_decoders == MAX_DECODERS) {
	/*
	* Note: The octal board does not support control pins(bit16-19)
	* These bits are ignored in the octal board.
	*
	* disable VDEC A-C port, default to Mobilygen Interface
	*/
	value \|= 0x010001F8;
	} else {
	/* disable VDEC A-C port, default to Mobilygen Interface */
	value \|= 0x010F0108;
	}

	value \|= 7;
	ret_val = cx25821_i2c_write(&dev->i2c_bus[0], PIN_OE_CTRL, value);

	if (ret_val < 0)
	goto error;

	ret_val = medusa_set_videostandard(dev);

	error:
	return ret_val;
	}