drivers/media/video/gspca/stv06xx/stv06xx_st6422.c - kernel/mindspeed - Git at Google

 /*
  * Support for the sensor part which is integrated (I think) into the
  * st6422 stv06xx alike bridge, as its integrated there are no i2c writes
  * but instead direct bridge writes.
  *
  * Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
  *
  * Strongly based on qc-usb-messenger, which is:
  * Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
  *		      Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
  * Copyright (c) 2002, 2003 Tuukka Toivonen
  *
  * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include "stv06xx_st6422.h"

 /* controls */
 enum e_ctrl {
 	BRIGHTNESS,
 	CONTRAST,
 	GAIN,
 	EXPOSURE,
 	NCTRLS		/* number of controls */
 };

 /* sensor settings */
 struct st6422_settings {
 	struct gspca_ctrl ctrls[NCTRLS];
 };

 static struct v4l2_pix_format st6422_mode[] = {
 	/* Note we actually get 124 lines of data, of which we skip the 4st
 	   4 as they are garbage */
 	{
 		162,
 		120,
 		V4L2_PIX_FMT_SGRBG8,
 		V4L2_FIELD_NONE,
 		.sizeimage = 162 * 120,
 		.bytesperline = 162,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 1
 	},
 	/* Note we actually get 248 lines of data, of which we skip the 4st
 	   4 as they are garbage, and we tell the app it only gets the
 	   first 240 of the 244 lines it actually gets, so that it ignores
 	   the last 4. */
 	{
 		324,
 		240,
 		V4L2_PIX_FMT_SGRBG8,
 		V4L2_FIELD_NONE,
 		.sizeimage = 324 * 244,
 		.bytesperline = 324,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0
 	},
 };

 /* V4L2 controls supported by the driver */
 static void st6422_set_brightness(struct gspca_dev *gspca_dev);
 static void st6422_set_contrast(struct gspca_dev *gspca_dev);
 static void st6422_set_gain(struct gspca_dev *gspca_dev);
 static void st6422_set_exposure(struct gspca_dev *gspca_dev);

 static const struct ctrl st6422_ctrl[NCTRLS] = {
 [BRIGHTNESS] = {
 		{
 			.id		= V4L2_CID_BRIGHTNESS,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "Brightness",
 			.minimum	= 0,
 			.maximum	= 31,
 			.step		= 1,
 			.default_value  = 3
 		},
 		.set_control = st6422_set_brightness
 	},
 [CONTRAST] = {
 		{
 			.id		= V4L2_CID_CONTRAST,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "Contrast",
 			.minimum	= 0,
 			.maximum	= 15,
 			.step		= 1,
 			.default_value  = 11
 		},
 		.set_control = st6422_set_contrast
 	},
 [GAIN] = {
 		{
 			.id		= V4L2_CID_GAIN,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "Gain",
 			.minimum	= 0,
 			.maximum	= 255,
 			.step		= 1,
 			.default_value  = 64
 		},
 		.set_control = st6422_set_gain
 	},
 [EXPOSURE] = {
 		{
 			.id		= V4L2_CID_EXPOSURE,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "Exposure",
 			.minimum	= 0,
 #define EXPOSURE_MAX 1023
 			.maximum	= EXPOSURE_MAX,
 			.step		= 1,
 			.default_value  = 256
 		},
 		.set_control = st6422_set_exposure
 	},
 };

 static int st6422_probe(struct sd *sd)
 {
 	struct st6422_settings *sensor_settings;

 	if (sd->bridge != BRIDGE_ST6422)
 		return -ENODEV;

 	pr_info("st6422 sensor detected\n");

 	sensor_settings = kmalloc(sizeof *sensor_settings, GFP_KERNEL);
 	if (!sensor_settings)
 		return -ENOMEM;

 	sd->gspca_dev.cam.cam_mode = st6422_mode;
 	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(st6422_mode);
 	sd->gspca_dev.cam.ctrls = sensor_settings->ctrls;
 	sd->desc.ctrls = st6422_ctrl;
 	sd->desc.nctrls = ARRAY_SIZE(st6422_ctrl);
 	sd->sensor_priv = sensor_settings;

 	return 0;
 }

 static int st6422_init(struct sd *sd)
 {
 	int err = 0, i;

 	const u16 st6422_bridge_init[][2] = {
 		{ STV_ISO_ENABLE, 0x00 }, /* disable capture */
 		{ 0x1436, 0x00 },
 		{ 0x1432, 0x03 },	/* 0x00-0x1F brightness */
 		{ 0x143a, 0xf9 },	/* 0x00-0x0F contrast */
 		{ 0x0509, 0x38 },	/* R */
 		{ 0x050a, 0x38 },	/* G */
 		{ 0x050b, 0x38 },	/* B */
 		{ 0x050c, 0x2a },
 		{ 0x050d, 0x01 },


 		{ 0x1431, 0x00 },	/* 0x00-0x07 ??? */
 		{ 0x1433, 0x34 },	/* 160x120, 0x00-0x01 night filter */
 		{ 0x1438, 0x18 },	/* 640x480 */
 /* 18 bayes */
 /* 10 compressed? */

 		{ 0x1439, 0x00 },
 /* anti-noise?  0xa2 gives a perfect image */

 		{ 0x143b, 0x05 },
 		{ 0x143c, 0x00 },	/* 0x00-0x01 - ??? */


 /* shutter time 0x0000-0x03FF */
 /* low value  give good picures on moving objects (but requires much light) */
 /* high value gives good picures in darkness (but tends to be overexposed) */
 		{ 0x143e, 0x01 },
 		{ 0x143d, 0x00 },

 		{ 0x1442, 0xe2 },
 /* write: 1x1x xxxx */
 /* read:  1x1x xxxx */
 /*        bit 5 == button pressed and hold if 0 */
 /* write 0xe2,0xea */

 /* 0x144a */
 /* 0x00 init */
 /* bit 7 == button has been pressed, but not handled */

 /* interrupt */
 /* if(urb->iso_frame_desc[i].status == 0x80) { */
 /* if(urb->iso_frame_desc[i].status == 0x88) { */

 		{ 0x1500, 0xd0 },
 		{ 0x1500, 0xd0 },
 		{ 0x1500, 0x50 },	/* 0x00 - 0xFF  0x80 == compr ? */

 		{ 0x1501, 0xaf },
 /* high val-> light area gets darker */
 /* low val -> light area gets lighter */
 		{ 0x1502, 0xc2 },
 /* high val-> light area gets darker */
 /* low val -> light area gets lighter */
 		{ 0x1503, 0x45 },
 /* high val-> light area gets darker */
 /* low val -> light area gets lighter */
 		{ 0x1505, 0x02 },
 /* 2  : 324x248  80352 bytes */
 /* 7  : 248x162  40176 bytes */
 /* c+f: 162*124  20088 bytes */

 		{ 0x150e, 0x8e },
 		{ 0x150f, 0x37 },
 		{ 0x15c0, 0x00 },
 		{ 0x15c3, 0x08 },	/* 0x04/0x14 ... test pictures ??? */


 		{ 0x143f, 0x01 },	/* commit settings */

 	};

 	for (i = 0; i < ARRAY_SIZE(st6422_bridge_init) && !err; i++) {
 		err = stv06xx_write_bridge(sd, st6422_bridge_init[i][0],
 					       st6422_bridge_init[i][1]);
 	}

 	return err;
 }

 static void st6422_disconnect(struct sd *sd)
 {
 	sd->sensor = NULL;
 	kfree(sd->sensor_priv);
 }

 static int setbrightness(struct sd *sd)
 {
 	struct st6422_settings *sensor_settings = sd->sensor_priv;

 	/* val goes from 0 -> 31 */
 	return stv06xx_write_bridge(sd, 0x1432,
 			sensor_settings->ctrls[BRIGHTNESS].val);
 }

 static int setcontrast(struct sd *sd)
 {
 	struct st6422_settings *sensor_settings = sd->sensor_priv;

 	/* Val goes from 0 -> 15 */
 	return stv06xx_write_bridge(sd, 0x143a,
 			sensor_settings->ctrls[CONTRAST].val | 0xf0);
 }

 static int setgain(struct sd *sd)
 {
 	struct st6422_settings *sensor_settings = sd->sensor_priv;
 	u8 gain;
 	int err;

 	gain = sensor_settings->ctrls[GAIN].val;

 	/* Set red, green, blue, gain */
 	err = stv06xx_write_bridge(sd, 0x0509, gain);
 	if (err < 0)
 		return err;

 	err = stv06xx_write_bridge(sd, 0x050a, gain);
 	if (err < 0)
 		return err;

 	err = stv06xx_write_bridge(sd, 0x050b, gain);
 	if (err < 0)
 		return err;

 	/* 2 mystery writes */
 	err = stv06xx_write_bridge(sd, 0x050c, 0x2a);
 	if (err < 0)
 		return err;

 	return stv06xx_write_bridge(sd, 0x050d, 0x01);
 }

 static int setexposure(struct sd *sd)
 {
 	struct st6422_settings *sensor_settings = sd->sensor_priv;
 	u16 expo;
 	int err;

 	expo = sensor_settings->ctrls[EXPOSURE].val;
 	err = stv06xx_write_bridge(sd, 0x143d, expo & 0xff);
 	if (err < 0)
 		return err;

 	return stv06xx_write_bridge(sd, 0x143e, expo >> 8);
 }

 static int st6422_start(struct sd *sd)
 {
 	int err;
 	struct cam *cam = &sd->gspca_dev.cam;

 	if (cam->cam_mode[sd->gspca_dev.curr_mode].priv)
 		err = stv06xx_write_bridge(sd, 0x1505, 0x0f);
 	else
 		err = stv06xx_write_bridge(sd, 0x1505, 0x02);
 	if (err < 0)
 		return err;

 	err = setbrightness(sd);
 	if (err < 0)
 		return err;

 	err = setcontrast(sd);
 	if (err < 0)
 		return err;

 	err = setexposure(sd);
 	if (err < 0)
 		return err;

 	err = setgain(sd);
 	if (err < 0)
 		return err;

 	/* commit settings */
 	err = stv06xx_write_bridge(sd, 0x143f, 0x01);
 	return (err < 0) ? err : 0;
 }

 static int st6422_stop(struct sd *sd)
 {
 	PDEBUG(D_STREAM, "Halting stream");

 	return 0;
 }

 static void st6422_set_brightness(struct gspca_dev *gspca_dev)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;

 	err = setbrightness(sd);

 	/* commit settings */
 	if (err >= 0)
 		err = stv06xx_write_bridge(sd, 0x143f, 0x01);

 	gspca_dev->usb_err = err;
 }

 static void st6422_set_contrast(struct gspca_dev *gspca_dev)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;

 	err = setcontrast(sd);

 	/* commit settings */
 	if (err >= 0)
 		err = stv06xx_write_bridge(sd, 0x143f, 0x01);

 	gspca_dev->usb_err = err;
 }

 static void st6422_set_gain(struct gspca_dev *gspca_dev)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;

 	err = setgain(sd);

 	/* commit settings */
 	if (err >= 0)
 		err = stv06xx_write_bridge(sd, 0x143f, 0x01);

 	gspca_dev->usb_err = err;
 }

 static void st6422_set_exposure(struct gspca_dev *gspca_dev)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;

 	err = setexposure(sd);

 	/* commit settings */
 	if (err >= 0)
 		err = stv06xx_write_bridge(sd, 0x143f, 0x01);

 	gspca_dev->usb_err = err;
 }
	/*
	* Support for the sensor part which is integrated (I think) into the
	* st6422 stv06xx alike bridge, as its integrated there are no i2c writes
	* but instead direct bridge writes.
	*
	* Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
	*
	* Strongly based on qc-usb-messenger, which is:
	* Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
	* Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
	* Copyright (c) 2002, 2003 Tuukka Toivonen
	*
	* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include "stv06xx_st6422.h"

	/* controls */
	enum e_ctrl {
	BRIGHTNESS,
	CONTRAST,
	GAIN,
	EXPOSURE,
	NCTRLS /* number of controls */
	};

	/* sensor settings */
	struct st6422_settings {
	struct gspca_ctrl ctrls[NCTRLS];
	};

	static struct v4l2_pix_format st6422_mode[] = {
	/* Note we actually get 124 lines of data, of which we skip the 4st
	4 as they are garbage */
	{
	162,
	120,
	V4L2_PIX_FMT_SGRBG8,
	V4L2_FIELD_NONE,
	.sizeimage = 162 * 120,
	.bytesperline = 162,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 1
	},
	/* Note we actually get 248 lines of data, of which we skip the 4st
	4 as they are garbage, and we tell the app it only gets the
	first 240 of the 244 lines it actually gets, so that it ignores
	the last 4. */
	{
	324,
	240,
	V4L2_PIX_FMT_SGRBG8,
	V4L2_FIELD_NONE,
	.sizeimage = 324 * 244,
	.bytesperline = 324,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0
	},
	};

	/* V4L2 controls supported by the driver */
	static void st6422_set_brightness(struct gspca_dev *gspca_dev);
	static void st6422_set_contrast(struct gspca_dev *gspca_dev);
	static void st6422_set_gain(struct gspca_dev *gspca_dev);
	static void st6422_set_exposure(struct gspca_dev *gspca_dev);

	static const struct ctrl st6422_ctrl[NCTRLS] = {
	[BRIGHTNESS] = {
	{
	.id = V4L2_CID_BRIGHTNESS,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "Brightness",
	.minimum = 0,
	.maximum = 31,
	.step = 1,
	.default_value = 3
	},
	.set_control = st6422_set_brightness
	},
	[CONTRAST] = {
	{
	.id = V4L2_CID_CONTRAST,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "Contrast",
	.minimum = 0,
	.maximum = 15,
	.step = 1,
	.default_value = 11
	},
	.set_control = st6422_set_contrast
	},
	[GAIN] = {
	{
	.id = V4L2_CID_GAIN,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "Gain",
	.minimum = 0,
	.maximum = 255,
	.step = 1,
	.default_value = 64
	},
	.set_control = st6422_set_gain
	},
	[EXPOSURE] = {
	{
	.id = V4L2_CID_EXPOSURE,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "Exposure",
	.minimum = 0,
	#define EXPOSURE_MAX 1023
	.maximum = EXPOSURE_MAX,
	.step = 1,
	.default_value = 256
	},
	.set_control = st6422_set_exposure
	},
	};

	static int st6422_probe(struct sd *sd)
	{
	struct st6422_settings *sensor_settings;

	if (sd->bridge != BRIDGE_ST6422)
	return -ENODEV;

	pr_info("st6422 sensor detected\n");

	sensor_settings = kmalloc(sizeof *sensor_settings, GFP_KERNEL);
	if (!sensor_settings)
	return -ENOMEM;

	sd->gspca_dev.cam.cam_mode = st6422_mode;
	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(st6422_mode);
	sd->gspca_dev.cam.ctrls = sensor_settings->ctrls;
	sd->desc.ctrls = st6422_ctrl;
	sd->desc.nctrls = ARRAY_SIZE(st6422_ctrl);
	sd->sensor_priv = sensor_settings;

	return 0;
	}

	static int st6422_init(struct sd *sd)
	{
	int err = 0, i;

	const u16 st6422_bridge_init[][2] = {
	{ STV_ISO_ENABLE, 0x00 }, /* disable capture */
	{ 0x1436, 0x00 },
	{ 0x1432, 0x03 }, /* 0x00-0x1F brightness */
	{ 0x143a, 0xf9 }, /* 0x00-0x0F contrast */
	{ 0x0509, 0x38 }, /* R */
	{ 0x050a, 0x38 }, /* G */
	{ 0x050b, 0x38 }, /* B */
	{ 0x050c, 0x2a },
	{ 0x050d, 0x01 },


	{ 0x1431, 0x00 }, /* 0x00-0x07 ??? */
	{ 0x1433, 0x34 }, /* 160x120, 0x00-0x01 night filter */
	{ 0x1438, 0x18 }, /* 640x480 */
	/* 18 bayes */
	/* 10 compressed? */

	{ 0x1439, 0x00 },
	/* anti-noise? 0xa2 gives a perfect image */

	{ 0x143b, 0x05 },
	{ 0x143c, 0x00 }, /* 0x00-0x01 - ??? */


	/* shutter time 0x0000-0x03FF */
	/* low value give good picures on moving objects (but requires much light) */
	/* high value gives good picures in darkness (but tends to be overexposed) */
	{ 0x143e, 0x01 },
	{ 0x143d, 0x00 },

	{ 0x1442, 0xe2 },
	/* write: 1x1x xxxx */
	/* read: 1x1x xxxx */
	/* bit 5 == button pressed and hold if 0 */
	/* write 0xe2,0xea */

	/* 0x144a */
	/* 0x00 init */
	/* bit 7 == button has been pressed, but not handled */

	/* interrupt */
	/* if(urb->iso_frame_desc[i].status == 0x80) { */
	/* if(urb->iso_frame_desc[i].status == 0x88) { */

	{ 0x1500, 0xd0 },
	{ 0x1500, 0xd0 },
	{ 0x1500, 0x50 }, /* 0x00 - 0xFF 0x80 == compr ? */

	{ 0x1501, 0xaf },
	/* high val-> light area gets darker */
	/* low val -> light area gets lighter */
	{ 0x1502, 0xc2 },
	/* high val-> light area gets darker */
	/* low val -> light area gets lighter */
	{ 0x1503, 0x45 },
	/* high val-> light area gets darker */
	/* low val -> light area gets lighter */
	{ 0x1505, 0x02 },
	/* 2 : 324x248 80352 bytes */
	/* 7 : 248x162 40176 bytes */
	/* c+f: 162124 20088 bytes /

	{ 0x150e, 0x8e },
	{ 0x150f, 0x37 },
	{ 0x15c0, 0x00 },
	{ 0x15c3, 0x08 }, /* 0x04/0x14 ... test pictures ??? */


	{ 0x143f, 0x01 }, /* commit settings */

	};

	for (i = 0; i < ARRAY_SIZE(st6422_bridge_init) && !err; i++) {
	err = stv06xx_write_bridge(sd, st6422_bridge_init[i][0],
	st6422_bridge_init[i][1]);
	}

	return err;
	}

	static void st6422_disconnect(struct sd *sd)
	{
	sd->sensor = NULL;
	kfree(sd->sensor_priv);
	}

	static int setbrightness(struct sd *sd)
	{
	struct st6422_settings *sensor_settings = sd->sensor_priv;

	/* val goes from 0 -> 31 */
	return stv06xx_write_bridge(sd, 0x1432,
	sensor_settings->ctrls[BRIGHTNESS].val);
	}

	static int setcontrast(struct sd *sd)
	{
	struct st6422_settings *sensor_settings = sd->sensor_priv;

	/* Val goes from 0 -> 15 */
	return stv06xx_write_bridge(sd, 0x143a,
	sensor_settings->ctrls[CONTRAST].val \| 0xf0);
	}

	static int setgain(struct sd *sd)
	{
	struct st6422_settings *sensor_settings = sd->sensor_priv;
	u8 gain;
	int err;

	gain = sensor_settings->ctrls[GAIN].val;

	/* Set red, green, blue, gain */
	err = stv06xx_write_bridge(sd, 0x0509, gain);
	if (err < 0)
	return err;

	err = stv06xx_write_bridge(sd, 0x050a, gain);
	if (err < 0)
	return err;

	err = stv06xx_write_bridge(sd, 0x050b, gain);
	if (err < 0)
	return err;

	/* 2 mystery writes */
	err = stv06xx_write_bridge(sd, 0x050c, 0x2a);
	if (err < 0)
	return err;

	return stv06xx_write_bridge(sd, 0x050d, 0x01);
	}

	static int setexposure(struct sd *sd)
	{
	struct st6422_settings *sensor_settings = sd->sensor_priv;
	u16 expo;
	int err;

	expo = sensor_settings->ctrls[EXPOSURE].val;
	err = stv06xx_write_bridge(sd, 0x143d, expo & 0xff);
	if (err < 0)
	return err;

	return stv06xx_write_bridge(sd, 0x143e, expo >> 8);
	}

	static int st6422_start(struct sd *sd)
	{
	int err;
	struct cam *cam = &sd->gspca_dev.cam;

	if (cam->cam_mode[sd->gspca_dev.curr_mode].priv)
	err = stv06xx_write_bridge(sd, 0x1505, 0x0f);
	else
	err = stv06xx_write_bridge(sd, 0x1505, 0x02);
	if (err < 0)
	return err;

	err = setbrightness(sd);
	if (err < 0)
	return err;

	err = setcontrast(sd);
	if (err < 0)
	return err;

	err = setexposure(sd);
	if (err < 0)
	return err;

	err = setgain(sd);
	if (err < 0)
	return err;

	/* commit settings */
	err = stv06xx_write_bridge(sd, 0x143f, 0x01);
	return (err < 0) ? err : 0;
	}

	static int st6422_stop(struct sd *sd)
	{
	PDEBUG(D_STREAM, "Halting stream");

	return 0;
	}

	static void st6422_set_brightness(struct gspca_dev *gspca_dev)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;

	err = setbrightness(sd);

	/* commit settings */
	if (err >= 0)
	err = stv06xx_write_bridge(sd, 0x143f, 0x01);

	gspca_dev->usb_err = err;
	}

	static void st6422_set_contrast(struct gspca_dev *gspca_dev)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;

	err = setcontrast(sd);

	/* commit settings */
	if (err >= 0)
	err = stv06xx_write_bridge(sd, 0x143f, 0x01);

	gspca_dev->usb_err = err;
	}

	static void st6422_set_gain(struct gspca_dev *gspca_dev)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;

	err = setgain(sd);

	/* commit settings */
	if (err >= 0)
	err = stv06xx_write_bridge(sd, 0x143f, 0x01);

	gspca_dev->usb_err = err;
	}

	static void st6422_set_exposure(struct gspca_dev *gspca_dev)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;

	err = setexposure(sd);

	/* commit settings */
	if (err >= 0)
	err = stv06xx_write_bridge(sd, 0x143f, 0x01);

	gspca_dev->usb_err = err;
	}