drivers/media/video/gspca/stv06xx/stv06xx_vv6410.c - maze/linux - Git at Google

 /*
  * Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
  *		      Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
  * Copyright (c) 2002, 2003 Tuukka Toivonen
  * Copyright (c) 2008 Erik Andrén
  *
  * 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
  *
  * P/N 861037:      Sensor HDCS1000        ASIC STV0600
  * P/N 861050-0010: Sensor HDCS1000        ASIC STV0600
  * P/N 861050-0020: Sensor Photobit PB100  ASIC STV0600-1 - QuickCam Express
  * P/N 861055:      Sensor ST VV6410       ASIC STV0610   - LEGO cam
  * P/N 861075-0040: Sensor HDCS1000        ASIC
  * P/N 961179-0700: Sensor ST VV6410       ASIC STV0602   - Dexxa WebCam USB
  * P/N 861040-0000: Sensor ST VV6410       ASIC STV0610   - QuickCam Web
  */

 #include "stv06xx_vv6410.h"

 static struct v4l2_pix_format vv6410_mode[] = {
 	{
 		356,
 		292,
 		V4L2_PIX_FMT_SGRBG8,
 		V4L2_FIELD_NONE,
 		.sizeimage = 356 * 292,
 		.bytesperline = 356,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0
 	}
 };

 static const struct ctrl vv6410_ctrl[] = {
 #define HFLIP_IDX 0
 	{
 		{
 			.id		= V4L2_CID_HFLIP,
 			.type		= V4L2_CTRL_TYPE_BOOLEAN,
 			.name		= "horizontal flip",
 			.minimum	= 0,
 			.maximum	= 1,
 			.step		= 1,
 			.default_value	= 0
 		},
 		.set = vv6410_set_hflip,
 		.get = vv6410_get_hflip
 	},
 #define VFLIP_IDX 1
 	{
 		{
 			.id		= V4L2_CID_VFLIP,
 			.type		= V4L2_CTRL_TYPE_BOOLEAN,
 			.name		= "vertical flip",
 			.minimum	= 0,
 			.maximum	= 1,
 			.step		= 1,
 			.default_value	= 0
 		},
 		.set = vv6410_set_vflip,
 		.get = vv6410_get_vflip
 	},
 #define GAIN_IDX 2
 	{
 		{
 			.id		= V4L2_CID_GAIN,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "analog gain",
 			.minimum	= 0,
 			.maximum	= 15,
 			.step		= 1,
 			.default_value  = 10
 		},
 		.set = vv6410_set_analog_gain,
 		.get = vv6410_get_analog_gain
 	},
 #define EXPOSURE_IDX 3
 	{
 		{
 			.id		= V4L2_CID_EXPOSURE,
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "exposure",
 			.minimum	= 0,
 			.maximum	= 32768,
 			.step		= 1,
 			.default_value  = 20000
 		},
 		.set = vv6410_set_exposure,
 		.get = vv6410_get_exposure
 	}
 	};

 static int vv6410_probe(struct sd *sd)
 {
 	u16 data;
 	int err, i;
 	s32 *sensor_settings;

 	err = stv06xx_read_sensor(sd, VV6410_DEVICEH, &data);
 	if (err < 0)
 		return -ENODEV;

 	if (data == 0x19) {
 		info("vv6410 sensor detected");

 		sensor_settings = kmalloc(ARRAY_SIZE(vv6410_ctrl) * sizeof(s32),
 					  GFP_KERNEL);
 		if (!sensor_settings)
 			return -ENOMEM;

 		sd->gspca_dev.cam.cam_mode = vv6410_mode;
 		sd->gspca_dev.cam.nmodes = ARRAY_SIZE(vv6410_mode);
 		sd->desc.ctrls = vv6410_ctrl;
 		sd->desc.nctrls = ARRAY_SIZE(vv6410_ctrl);

 		for (i = 0; i < sd->desc.nctrls; i++)
 			sensor_settings[i] = vv6410_ctrl[i].qctrl.default_value;
 		sd->sensor_priv = sensor_settings;
 		return 0;
 	}
 	return -ENODEV;
 }

 static int vv6410_init(struct sd *sd)
 {
 	int err = 0, i;
 	s32 *sensor_settings = sd->sensor_priv;

 	for (i = 0; i < ARRAY_SIZE(stv_bridge_init); i++) {
 		/* if NULL then len contains single value */
 		if (stv_bridge_init[i].data == NULL) {
 			err = stv06xx_write_bridge(sd,
 				stv_bridge_init[i].start,
 				stv_bridge_init[i].len);
 		} else {
 			int j;
 			for (j = 0; j < stv_bridge_init[i].len; j++)
 				err = stv06xx_write_bridge(sd,
 					stv_bridge_init[i].start + j,
 					stv_bridge_init[i].data[j]);
 		}
 	}

 	if (err < 0)
 		return err;

 	err = stv06xx_write_sensor_bytes(sd, (u8 *) vv6410_sensor_init,
 					 ARRAY_SIZE(vv6410_sensor_init));
 	if (err < 0)
 		return err;

 	err = vv6410_set_exposure(&sd->gspca_dev,
 				   sensor_settings[EXPOSURE_IDX]);
 	if (err < 0)
 		return err;

 	err = vv6410_set_analog_gain(&sd->gspca_dev,
 				      sensor_settings[GAIN_IDX]);

 	return (err < 0) ? err : 0;
 }

 static void vv6410_disconnect(struct sd *sd)
 {
 	sd->sensor = NULL;
 	kfree(sd->sensor_priv);
 }

 static int vv6410_start(struct sd *sd)
 {
 	int err;
 	struct cam *cam = &sd->gspca_dev.cam;
 	u32 priv = cam->cam_mode[sd->gspca_dev.curr_mode].priv;

 	if (priv & VV6410_CROP_TO_QVGA) {
 		PDEBUG(D_CONF, "Cropping to QVGA");
 		stv06xx_write_sensor(sd, VV6410_XENDH, 320 - 1);
 		stv06xx_write_sensor(sd, VV6410_YENDH, 240 - 1);
 	} else {
 		stv06xx_write_sensor(sd, VV6410_XENDH, 360 - 1);
 		stv06xx_write_sensor(sd, VV6410_YENDH, 294 - 1);
 	}

 	if (priv & VV6410_SUBSAMPLE) {
 		PDEBUG(D_CONF, "Enabling subsampling");
 		stv06xx_write_bridge(sd, STV_Y_CTRL, 0x02);
 		stv06xx_write_bridge(sd, STV_X_CTRL, 0x06);

 		stv06xx_write_bridge(sd, STV_SCAN_RATE, 0x10);
 	} else {
 		stv06xx_write_bridge(sd, STV_Y_CTRL, 0x01);
 		stv06xx_write_bridge(sd, STV_X_CTRL, 0x0a);

 		stv06xx_write_bridge(sd, STV_SCAN_RATE, 0x20);
 	}

 	/* Turn on LED */
 	err = stv06xx_write_bridge(sd, STV_LED_CTRL, LED_ON);
 	if (err < 0)
 		return err;

 	err = stv06xx_write_sensor(sd, VV6410_SETUP0, 0);
 	if (err < 0)
 		return err;

 	PDEBUG(D_STREAM, "Starting stream");

 	return 0;
 }

 static int vv6410_stop(struct sd *sd)
 {
 	int err;

 	/* Turn off LED */
 	err = stv06xx_write_bridge(sd, STV_LED_CTRL, LED_OFF);
 	if (err < 0)
 		return err;

 	err = stv06xx_write_sensor(sd, VV6410_SETUP0, VV6410_LOW_POWER_MODE);
 	if (err < 0)
 		return err;

 	PDEBUG(D_STREAM, "Halting stream");

 	return (err < 0) ? err : 0;
 }

 static int vv6410_dump(struct sd *sd)
 {
 	u8 i;
 	int err = 0;

 	info("Dumping all vv6410 sensor registers");
 	for (i = 0; i < 0xff && !err; i++) {
 		u16 data;
 		err = stv06xx_read_sensor(sd, i, &data);
 		info("Register 0x%x contained 0x%x", i, data);
 	}
 	return (err < 0) ? err : 0;
 }

 static int vv6410_get_hflip(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	*val = sensor_settings[HFLIP_IDX];
 	PDEBUG(D_V4L2, "Read horizontal flip %d", *val);

 	return 0;
 }

 static int vv6410_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
 {
 	int err;
 	u16 i2c_data;
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	sensor_settings[HFLIP_IDX] = val;
 	err = stv06xx_read_sensor(sd, VV6410_DATAFORMAT, &i2c_data);
 	if (err < 0)
 		return err;

 	if (val)
 		i2c_data |= VV6410_HFLIP;
 	else
 		i2c_data &= ~VV6410_HFLIP;

 	PDEBUG(D_V4L2, "Set horizontal flip to %d", val);
 	err = stv06xx_write_sensor(sd, VV6410_DATAFORMAT, i2c_data);

 	return (err < 0) ? err : 0;
 }

 static int vv6410_get_vflip(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	*val = sensor_settings[VFLIP_IDX];
 	PDEBUG(D_V4L2, "Read vertical flip %d", *val);

 	return 0;
 }

 static int vv6410_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
 {
 	int err;
 	u16 i2c_data;
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;

 	sensor_settings[VFLIP_IDX] = val;
 	err = stv06xx_read_sensor(sd, VV6410_DATAFORMAT, &i2c_data);
 	if (err < 0)
 		return err;

 	if (val)
 		i2c_data |= VV6410_VFLIP;
 	else
 		i2c_data &= ~VV6410_VFLIP;

 	PDEBUG(D_V4L2, "Set vertical flip to %d", val);
 	err = stv06xx_write_sensor(sd, VV6410_DATAFORMAT, i2c_data);

 	return (err < 0) ? err : 0;
 }

 static int vv6410_get_analog_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 analog gain %d", *val);

 	return 0;
 }

 static int vv6410_set_analog_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;
 	PDEBUG(D_V4L2, "Set analog gain to %d", val);
 	err = stv06xx_write_sensor(sd, VV6410_ANALOGGAIN, 0xf0 | (val & 0xf));

 	return (err < 0) ? err : 0;
 }

 static int vv6410_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 vv6410_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
 {
 	int err;
 	struct sd *sd = (struct sd *) gspca_dev;
 	s32 *sensor_settings = sd->sensor_priv;
 	unsigned int fine, coarse;

 	sensor_settings[EXPOSURE_IDX] = val;

 	val = (val * val >> 14) + val / 4;

 	fine = val % VV6410_CIF_LINELENGTH;
 	coarse = min(512, val / VV6410_CIF_LINELENGTH);

 	PDEBUG(D_V4L2, "Set coarse exposure to %d, fine expsure to %d",
 	       coarse, fine);

 	err = stv06xx_write_sensor(sd, VV6410_FINEH, fine >> 8);
 	if (err < 0)
 		goto out;

 	err = stv06xx_write_sensor(sd, VV6410_FINEL, fine & 0xff);
 	if (err < 0)
 		goto out;

 	err = stv06xx_write_sensor(sd, VV6410_COARSEH, coarse >> 8);
 	if (err < 0)
 		goto out;

 	err = stv06xx_write_sensor(sd, VV6410_COARSEL, coarse & 0xff);

 out:
 	return err;
 }
	/*
	* Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
	* Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
	* Copyright (c) 2002, 2003 Tuukka Toivonen
	* Copyright (c) 2008 Erik Andrén
	*
	* 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
	*
	* P/N 861037: Sensor HDCS1000 ASIC STV0600
	* P/N 861050-0010: Sensor HDCS1000 ASIC STV0600
	* P/N 861050-0020: Sensor Photobit PB100 ASIC STV0600-1 - QuickCam Express
	* P/N 861055: Sensor ST VV6410 ASIC STV0610 - LEGO cam
	* P/N 861075-0040: Sensor HDCS1000 ASIC
	* P/N 961179-0700: Sensor ST VV6410 ASIC STV0602 - Dexxa WebCam USB
	* P/N 861040-0000: Sensor ST VV6410 ASIC STV0610 - QuickCam Web
	*/

	#include "stv06xx_vv6410.h"

	static struct v4l2_pix_format vv6410_mode[] = {
	{
	356,
	292,
	V4L2_PIX_FMT_SGRBG8,
	V4L2_FIELD_NONE,
	.sizeimage = 356 * 292,
	.bytesperline = 356,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0
	}
	};

	static const struct ctrl vv6410_ctrl[] = {
	#define HFLIP_IDX 0
	{
	{
	.id = V4L2_CID_HFLIP,
	.type = V4L2_CTRL_TYPE_BOOLEAN,
	.name = "horizontal flip",
	.minimum = 0,
	.maximum = 1,
	.step = 1,
	.default_value = 0
	},
	.set = vv6410_set_hflip,
	.get = vv6410_get_hflip
	},
	#define VFLIP_IDX 1
	{
	{
	.id = V4L2_CID_VFLIP,
	.type = V4L2_CTRL_TYPE_BOOLEAN,
	.name = "vertical flip",
	.minimum = 0,
	.maximum = 1,
	.step = 1,
	.default_value = 0
	},
	.set = vv6410_set_vflip,
	.get = vv6410_get_vflip
	},
	#define GAIN_IDX 2
	{
	{
	.id = V4L2_CID_GAIN,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "analog gain",
	.minimum = 0,
	.maximum = 15,
	.step = 1,
	.default_value = 10
	},
	.set = vv6410_set_analog_gain,
	.get = vv6410_get_analog_gain
	},
	#define EXPOSURE_IDX 3
	{
	{
	.id = V4L2_CID_EXPOSURE,
	.type = V4L2_CTRL_TYPE_INTEGER,
	.name = "exposure",
	.minimum = 0,
	.maximum = 32768,
	.step = 1,
	.default_value = 20000
	},
	.set = vv6410_set_exposure,
	.get = vv6410_get_exposure
	}
	};

	static int vv6410_probe(struct sd *sd)
	{
	u16 data;
	int err, i;
	s32 *sensor_settings;

	err = stv06xx_read_sensor(sd, VV6410_DEVICEH, &data);
	if (err < 0)
	return -ENODEV;

	if (data == 0x19) {
	info("vv6410 sensor detected");

	sensor_settings = kmalloc(ARRAY_SIZE(vv6410_ctrl) * sizeof(s32),
	GFP_KERNEL);
	if (!sensor_settings)
	return -ENOMEM;

	sd->gspca_dev.cam.cam_mode = vv6410_mode;
	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(vv6410_mode);
	sd->desc.ctrls = vv6410_ctrl;
	sd->desc.nctrls = ARRAY_SIZE(vv6410_ctrl);

	for (i = 0; i < sd->desc.nctrls; i++)
	sensor_settings[i] = vv6410_ctrl[i].qctrl.default_value;
	sd->sensor_priv = sensor_settings;
	return 0;
	}
	return -ENODEV;
	}

	static int vv6410_init(struct sd *sd)
	{
	int err = 0, i;
	s32 *sensor_settings = sd->sensor_priv;

	for (i = 0; i < ARRAY_SIZE(stv_bridge_init); i++) {
	/* if NULL then len contains single value */
	if (stv_bridge_init[i].data == NULL) {
	err = stv06xx_write_bridge(sd,
	stv_bridge_init[i].start,
	stv_bridge_init[i].len);
	} else {
	int j;
	for (j = 0; j < stv_bridge_init[i].len; j++)
	err = stv06xx_write_bridge(sd,
	stv_bridge_init[i].start + j,
	stv_bridge_init[i].data[j]);
	}
	}

	if (err < 0)
	return err;

	err = stv06xx_write_sensor_bytes(sd, (u8 *) vv6410_sensor_init,
	ARRAY_SIZE(vv6410_sensor_init));
	if (err < 0)
	return err;

	err = vv6410_set_exposure(&sd->gspca_dev,
	sensor_settings[EXPOSURE_IDX]);
	if (err < 0)
	return err;

	err = vv6410_set_analog_gain(&sd->gspca_dev,
	sensor_settings[GAIN_IDX]);

	return (err < 0) ? err : 0;
	}

	static void vv6410_disconnect(struct sd *sd)
	{
	sd->sensor = NULL;
	kfree(sd->sensor_priv);
	}

	static int vv6410_start(struct sd *sd)
	{
	int err;
	struct cam *cam = &sd->gspca_dev.cam;
	u32 priv = cam->cam_mode[sd->gspca_dev.curr_mode].priv;

	if (priv & VV6410_CROP_TO_QVGA) {
	PDEBUG(D_CONF, "Cropping to QVGA");
	stv06xx_write_sensor(sd, VV6410_XENDH, 320 - 1);
	stv06xx_write_sensor(sd, VV6410_YENDH, 240 - 1);
	} else {
	stv06xx_write_sensor(sd, VV6410_XENDH, 360 - 1);
	stv06xx_write_sensor(sd, VV6410_YENDH, 294 - 1);
	}

	if (priv & VV6410_SUBSAMPLE) {
	PDEBUG(D_CONF, "Enabling subsampling");
	stv06xx_write_bridge(sd, STV_Y_CTRL, 0x02);
	stv06xx_write_bridge(sd, STV_X_CTRL, 0x06);

	stv06xx_write_bridge(sd, STV_SCAN_RATE, 0x10);
	} else {
	stv06xx_write_bridge(sd, STV_Y_CTRL, 0x01);
	stv06xx_write_bridge(sd, STV_X_CTRL, 0x0a);

	stv06xx_write_bridge(sd, STV_SCAN_RATE, 0x20);
	}

	/* Turn on LED */
	err = stv06xx_write_bridge(sd, STV_LED_CTRL, LED_ON);
	if (err < 0)
	return err;

	err = stv06xx_write_sensor(sd, VV6410_SETUP0, 0);
	if (err < 0)
	return err;

	PDEBUG(D_STREAM, "Starting stream");

	return 0;
	}

	static int vv6410_stop(struct sd *sd)
	{
	int err;

	/* Turn off LED */
	err = stv06xx_write_bridge(sd, STV_LED_CTRL, LED_OFF);
	if (err < 0)
	return err;

	err = stv06xx_write_sensor(sd, VV6410_SETUP0, VV6410_LOW_POWER_MODE);
	if (err < 0)
	return err;

	PDEBUG(D_STREAM, "Halting stream");

	return (err < 0) ? err : 0;
	}

	static int vv6410_dump(struct sd *sd)
	{
	u8 i;
	int err = 0;

	info("Dumping all vv6410 sensor registers");
	for (i = 0; i < 0xff && !err; i++) {
	u16 data;
	err = stv06xx_read_sensor(sd, i, &data);
	info("Register 0x%x contained 0x%x", i, data);
	}
	return (err < 0) ? err : 0;
	}

	static int vv6410_get_hflip(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	*val = sensor_settings[HFLIP_IDX];
	PDEBUG(D_V4L2, "Read horizontal flip %d", *val);

	return 0;
	}

	static int vv6410_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
	{
	int err;
	u16 i2c_data;
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	sensor_settings[HFLIP_IDX] = val;
	err = stv06xx_read_sensor(sd, VV6410_DATAFORMAT, &i2c_data);
	if (err < 0)
	return err;

	if (val)
	i2c_data \|= VV6410_HFLIP;
	else
	i2c_data &= ~VV6410_HFLIP;

	PDEBUG(D_V4L2, "Set horizontal flip to %d", val);
	err = stv06xx_write_sensor(sd, VV6410_DATAFORMAT, i2c_data);

	return (err < 0) ? err : 0;
	}

	static int vv6410_get_vflip(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	*val = sensor_settings[VFLIP_IDX];
	PDEBUG(D_V4L2, "Read vertical flip %d", *val);

	return 0;
	}

	static int vv6410_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
	{
	int err;
	u16 i2c_data;
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;

	sensor_settings[VFLIP_IDX] = val;
	err = stv06xx_read_sensor(sd, VV6410_DATAFORMAT, &i2c_data);
	if (err < 0)
	return err;

	if (val)
	i2c_data \|= VV6410_VFLIP;
	else
	i2c_data &= ~VV6410_VFLIP;

	PDEBUG(D_V4L2, "Set vertical flip to %d", val);
	err = stv06xx_write_sensor(sd, VV6410_DATAFORMAT, i2c_data);

	return (err < 0) ? err : 0;
	}

	static int vv6410_get_analog_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 analog gain %d", *val);

	return 0;
	}

	static int vv6410_set_analog_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;
	PDEBUG(D_V4L2, "Set analog gain to %d", val);
	err = stv06xx_write_sensor(sd, VV6410_ANALOGGAIN, 0xf0 \| (val & 0xf));

	return (err < 0) ? err : 0;
	}

	static int vv6410_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 vv6410_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
	{
	int err;
	struct sd sd = (struct sd ) gspca_dev;
	s32 *sensor_settings = sd->sensor_priv;
	unsigned int fine, coarse;

	sensor_settings[EXPOSURE_IDX] = val;

	val = (val * val >> 14) + val / 4;

	fine = val % VV6410_CIF_LINELENGTH;
	coarse = min(512, val / VV6410_CIF_LINELENGTH);

	PDEBUG(D_V4L2, "Set coarse exposure to %d, fine expsure to %d",
	coarse, fine);

	err = stv06xx_write_sensor(sd, VV6410_FINEH, fine >> 8);
	if (err < 0)
	goto out;

	err = stv06xx_write_sensor(sd, VV6410_FINEL, fine & 0xff);
	if (err < 0)
	goto out;

	err = stv06xx_write_sensor(sd, VV6410_COARSEH, coarse >> 8);
	if (err < 0)
	goto out;

	err = stv06xx_write_sensor(sd, VV6410_COARSEL, coarse & 0xff);

	out:
	return err;
	}