drivers/media/video/gspca/stv06xx/stv06xx_st6422.c - linux - 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
  *
  */

 #include "stv06xx_st6422.h"

 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
 	},
 };

 static const struct ctrl st6422_ctrl[] = {
 #define BRIGHTNESS_IDX 0
 	{
 		{
 			.id		= V4L2_CID_BRIGHTNESS,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "Brightness",
 			.minimum	= 0,
 			.maximum	= 31,
 			.step		= 1,
 			.default_value  = 3
 		},
 		.set = st6422_set_brightness,
 		.get = st6422_get_brightness
 	},
 #define CONTRAST_IDX 1
 	{
 		{
 			.id		= V4L2_CID_CONTRAST,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "Contrast",
 			.minimum	= 0,
 			.maximum	= 15,
 			.step		= 1,
 			.default_value  = 11
 		},
 		.set = st6422_set_contrast,
 		.get = st6422_get_contrast
 	},
 #define GAIN_IDX 2
 	{
 		{
 			.id		= V4L2_CID_GAIN,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "Gain",
 			.minimum	= 0,
 			.maximum	= 255,
 			.step		= 1,
 			.default_value  = 64
 		},
 		.set = st6422_set_gain,
 		.get = st6422_get_gain
 	},
 #define EXPOSURE_IDX 3
 	{
 		{
 			.id		= V4L2_CID_EXPOSURE,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "Exposure",
 			.minimum	= 0,
 			.maximum	= 1023,
 			.step		= 1,
 			.default_value  = 256
 		},
 		.set = st6422_set_exposure,
 		.get = st6422_get_exposure
 	},
 };

 static int st6422_probe(struct sd *sd)
 {
 	int i;
 	s32 *sensor_settings;

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

 	info("st6422 sensor detected");

 	sensor_settings = kmalloc(ARRAY_SIZE(st6422_ctrl) * sizeof(s32),
 				  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->desc.ctrls = st6422_ctrl;
 	sd->desc.nctrls = ARRAY_SIZE(st6422_ctrl);
 	sd->sensor_priv = sensor_settings;

 	for (i = 0; i < sd->desc.nctrls; i++)
 		sensor_settings[i] = st6422_ctrl[i].qctrl.default_value;

 	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 },
 /* antiflimmer??  0xa2 ger perfekt bild mot monitor */

 		{ 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-> ljus area blir morkare. */
 /* low val -> ljus area blir ljusare. */
 		{ 0x1502, 0xc2 },
 /* high val-> ljus area blir morkare. */
 /* low val -> ljus area blir ljusare. */
 		{ 0x1503, 0x45 },
 /* high val-> ljus area blir morkare. */
 /* low val -> ljus area blir ljusare. */

 		{ 0x1505, 0x02 },
 /* 2  : 324x248  80352 bytes */
 /* 7  : 248x162  40176 bytes */
 /* c+f: 162*124  20088 bytes */

 		{ 0x150e, 0x8e },
 		{ 0x150f, 0x37 },
 		{ 0x15c0, 0x00 },
 		{ 0x15c1, 1023 }, /* 160x120, ISOC_PACKET_SIZE */
 		{ 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 st6422_start(struct sd *sd)
 {
 	int err, packet_size;
 	struct cam *cam = &sd->gspca_dev.cam;
 	s32 *sensor_settings = sd->sensor_priv;
 	struct usb_host_interface *alt;
 	struct usb_interface *intf;

 	intf = usb_ifnum_to_if(sd->gspca_dev.dev, sd->gspca_dev.iface);
 	alt = usb_altnum_to_altsetting(intf, sd->gspca_dev.alt);
 	if (!alt) {
 		PDEBUG(D_ERR, "Couldn't get altsetting");
 		return -EIO;
 	}

 	packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize);
 	err = stv06xx_write_bridge(sd, 0x15c1, packet_size);
 	if (err < 0)
 		return err;

 	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 = st6422_set_brightness(&sd->gspca_dev,
 				    sensor_settings[BRIGHTNESS_IDX]);
 	if (err < 0)
 		return err;

 	err = st6422_set_contrast(&sd->gspca_dev,
 				  sensor_settings[CONTRAST_IDX]);
 	if (err < 0)
 		return err;

 	err = st6422_set_exposure(&sd->gspca_dev,
 				  sensor_settings[EXPOSURE_IDX]);
 	if (err < 0)
 		return err;

 	err = st6422_set_gain(&sd->gspca_dev,
 			      sensor_settings[GAIN_IDX]);
 	if (err < 0)
 		return err;

 	PDEBUG(D_STREAM, "Starting stream");

 	return 0;
 }

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

 	return 0;
 }

 static int st6422_get_brightness(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	*val = sensor_settings[BRIGHTNESS_IDX];

 	PDEBUG(D_V4L2, "Read brightness %d", *val);

 	return 0;
 }

 static int st6422_set_brightness(struct gspca_dev *gspca_dev, __s32 val)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	sensor_settings[BRIGHTNESS_IDX] = val;

 	if (!gspca_dev->streaming)
 		return 0;

 	/* val goes from 0 -> 31 */
 	PDEBUG(D_V4L2, "Set brightness to %d", val);
 	err = stv06xx_write_bridge(sd, 0x1432, val);
 	if (err < 0)
 		return err;

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

 static int st6422_get_contrast(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	*val = sensor_settings[CONTRAST_IDX];

 	PDEBUG(D_V4L2, "Read contrast %d", *val);

 	return 0;
 }

 static int st6422_set_contrast(struct gspca_dev *gspca_dev, __s32 val)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	sensor_settings[CONTRAST_IDX] = val;

 	if (!gspca_dev->streaming)
 		return 0;

 	/* Val goes from 0 -> 15 */
 	PDEBUG(D_V4L2, "Set contrast to %d\n", val);
 	err = stv06xx_write_bridge(sd, 0x143a, 0xf0 | val);
 	if (err < 0)
 		return err;

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

 static int st6422_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	*val = sensor_settings[GAIN_IDX];

 	PDEBUG(D_V4L2, "Read gain %d", *val);

 	return 0;
 }

 static int st6422_set_gain(struct gspca_dev *gspca_dev, __s32 val)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	sensor_settings[GAIN_IDX] = val;

 	if (!gspca_dev->streaming)
 		return 0;

 	PDEBUG(D_V4L2, "Set gain to %d", val);

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

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

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

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

 	err = stv06xx_write_bridge(sd, 0x050d, 0x01);
 	if (err < 0)
 		return err;

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

 static int st6422_get_exposure(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	*val = sensor_settings[EXPOSURE_IDX];

 	PDEBUG(D_V4L2, "Read exposure %d", *val);

 	return 0;
 }

 static int st6422_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	sensor_settings[EXPOSURE_IDX] = val;

 	if (!gspca_dev->streaming)
 		return 0;

 	PDEBUG(D_V4L2, "Set exposure to %d\n", val);
 	err = stv06xx_write_bridge(sd, 0x143d, val & 0xff);
 	if (err < 0)
 		return err;

 	err = stv06xx_write_bridge(sd, 0x143e, val >> 8);
 	if (err < 0)
 		return err;

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

	#include "stv06xx_st6422.h"

	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
	},
	};

	static const struct ctrl st6422_ctrl[] = {
	#define BRIGHTNESS_IDX 0
	{
	{
	.id = V4L2_CID_BRIGHTNESS,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "Brightness",
	.minimum = 0,
	.maximum = 31,
	.step = 1,
	.default_value = 3
	},
	.set = st6422_set_brightness,
	.get = st6422_get_brightness
	},
	#define CONTRAST_IDX 1
	{
	{
	.id = V4L2_CID_CONTRAST,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "Contrast",
	.minimum = 0,
	.maximum = 15,
	.step = 1,
	.default_value = 11
	},
	.set = st6422_set_contrast,
	.get = st6422_get_contrast
	},
	#define GAIN_IDX 2
	{
	{
	.id = V4L2_CID_GAIN,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "Gain",
	.minimum = 0,
	.maximum = 255,
	.step = 1,
	.default_value = 64
	},
	.set = st6422_set_gain,
	.get = st6422_get_gain
	},
	#define EXPOSURE_IDX 3
	{
	{
	.id = V4L2_CID_EXPOSURE,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "Exposure",
	.minimum = 0,
	.maximum = 1023,
	.step = 1,
	.default_value = 256
	},
	.set = st6422_set_exposure,
	.get = st6422_get_exposure
	},
	};

	static int st6422_probe(struct sd *sd)
	{
	int i;
	s32 *sensor_settings;

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

	info("st6422 sensor detected");

	sensor_settings = kmalloc(ARRAY_SIZE(st6422_ctrl) * sizeof(s32),
	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->desc.ctrls = st6422_ctrl;
	sd->desc.nctrls = ARRAY_SIZE(st6422_ctrl);
	sd->sensor_priv = sensor_settings;

	for (i = 0; i < sd->desc.nctrls; i++)
	sensor_settings[i] = st6422_ctrl[i].qctrl.default_value;

	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 },
	/* antiflimmer?? 0xa2 ger perfekt bild mot monitor */

	{ 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-> ljus area blir morkare. */
	/* low val -> ljus area blir ljusare. */
	{ 0x1502, 0xc2 },
	/* high val-> ljus area blir morkare. */
	/* low val -> ljus area blir ljusare. */
	{ 0x1503, 0x45 },
	/* high val-> ljus area blir morkare. */
	/* low val -> ljus area blir ljusare. */

	{ 0x1505, 0x02 },
	/* 2 : 324x248 80352 bytes */
	/* 7 : 248x162 40176 bytes */
	/* c+f: 162124 20088 bytes /

	{ 0x150e, 0x8e },
	{ 0x150f, 0x37 },
	{ 0x15c0, 0x00 },
	{ 0x15c1, 1023 }, /* 160x120, ISOC_PACKET_SIZE */
	{ 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 st6422_start(struct sd *sd)
	{
	int err, packet_size;
	struct cam *cam = &sd->gspca_dev.cam;
	s32 *sensor_settings = sd->sensor_priv;
	struct usb_host_interface *alt;
	struct usb_interface *intf;

	intf = usb_ifnum_to_if(sd->gspca_dev.dev, sd->gspca_dev.iface);
	alt = usb_altnum_to_altsetting(intf, sd->gspca_dev.alt);
	if (!alt) {
	PDEBUG(D_ERR, "Couldn't get altsetting");
	return -EIO;
	}

	packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize);
	err = stv06xx_write_bridge(sd, 0x15c1, packet_size);
	if (err < 0)
	return err;

	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 = st6422_set_brightness(&sd->gspca_dev,
	sensor_settings[BRIGHTNESS_IDX]);
	if (err < 0)
	return err;

	err = st6422_set_contrast(&sd->gspca_dev,
	sensor_settings[CONTRAST_IDX]);
	if (err < 0)
	return err;

	err = st6422_set_exposure(&sd->gspca_dev,
	sensor_settings[EXPOSURE_IDX]);
	if (err < 0)
	return err;

	err = st6422_set_gain(&sd->gspca_dev,
	sensor_settings[GAIN_IDX]);
	if (err < 0)
	return err;

	PDEBUG(D_STREAM, "Starting stream");

	return 0;
	}

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

	return 0;
	}

	static int st6422_get_brightness(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	*val = sensor_settings[BRIGHTNESS_IDX];

	PDEBUG(D_V4L2, "Read brightness %d", *val);

	return 0;
	}

	static int st6422_set_brightness(struct gspca_dev *gspca_dev, __s32 val)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	sensor_settings[BRIGHTNESS_IDX] = val;

	if (!gspca_dev->streaming)
	return 0;

	/* val goes from 0 -> 31 */
	PDEBUG(D_V4L2, "Set brightness to %d", val);
	err = stv06xx_write_bridge(sd, 0x1432, val);
	if (err < 0)
	return err;

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

	static int st6422_get_contrast(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	*val = sensor_settings[CONTRAST_IDX];

	PDEBUG(D_V4L2, "Read contrast %d", *val);

	return 0;
	}

	static int st6422_set_contrast(struct gspca_dev *gspca_dev, __s32 val)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	sensor_settings[CONTRAST_IDX] = val;

	if (!gspca_dev->streaming)
	return 0;

	/* Val goes from 0 -> 15 */
	PDEBUG(D_V4L2, "Set contrast to %d\n", val);
	err = stv06xx_write_bridge(sd, 0x143a, 0xf0 \| val);
	if (err < 0)
	return err;

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

	static int st6422_get_gain(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	*val = sensor_settings[GAIN_IDX];

	PDEBUG(D_V4L2, "Read gain %d", *val);

	return 0;
	}

	static int st6422_set_gain(struct gspca_dev *gspca_dev, __s32 val)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	sensor_settings[GAIN_IDX] = val;

	if (!gspca_dev->streaming)
	return 0;

	PDEBUG(D_V4L2, "Set gain to %d", val);

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

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

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

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

	err = stv06xx_write_bridge(sd, 0x050d, 0x01);
	if (err < 0)
	return err;

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

	static int st6422_get_exposure(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	*val = sensor_settings[EXPOSURE_IDX];

	PDEBUG(D_V4L2, "Read exposure %d", *val);

	return 0;
	}

	static int st6422_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	sensor_settings[EXPOSURE_IDX] = val;

	if (!gspca_dev->streaming)
	return 0;

	PDEBUG(D_V4L2, "Set exposure to %d\n", val);
	err = stv06xx_write_bridge(sd, 0x143d, val & 0xff);
	if (err < 0)
	return err;

	err = stv06xx_write_bridge(sd, 0x143e, val >> 8);
	if (err < 0)
	return err;

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