drivers/media/video/gspca/m5602/m5602_s5k4aa.c - kernel/msm-4.9 - Gitiles

 /*
  * Driver for the s5k4aa sensor
  *
  * Copyright (C) 2008 Erik Andrén
  * Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
  * Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
  *
  * Portions of code to USB interface and ALi driver software,
  * Copyright (c) 2006 Willem Duinker
  * v4l2 interface modeled after the V4L2 driver
  * for SN9C10x PC Camera Controllers
  *
  * 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, version 2.
  *
  */

 #include "m5602_s5k4aa.h"

 static
     const
 	struct dmi_system_id s5k4aa_vflip_dmi_table[] = {
 	{
 		.ident = "Fujitsu-Siemens Amilo Xa 2528",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Xa 2528")
 		}
 	}, {
 		.ident = "Fujitsu-Siemens Amilo Xi 2550",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Xi 2550")
 		}
 	}, {
 		.ident = "MSI GX700",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "GX700"),
 			DMI_MATCH(DMI_BIOS_DATE, "07/26/2007")
 		}
 	}, {
 		.ident = "MSI GX700/GX705/EX700",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "GX700/GX705/EX700")
 		}
 	},
 	{ }
 };

 static void s5k4aa_dump_registers(struct sd *sd);

 int s5k4aa_probe(struct sd *sd)
 {
 	u8 prod_id[6] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
 	const u8 expected_prod_id[6] = {0x00, 0x10, 0x00, 0x4b, 0x33, 0x75};
 	int i, err = 0;

 	if (force_sensor) {
 		if (force_sensor == S5K4AA_SENSOR) {
 			info("Forcing a %s sensor", s5k4aa.name);
 			goto sensor_found;
 		}
 		/* If we want to force another sensor, don't try to probe this
 		 * one */
 		return -ENODEV;
 	}

 	info("Probing for a s5k4aa sensor");

 	/* Preinit the sensor */
 	for (i = 0; i < ARRAY_SIZE(preinit_s5k4aa) && !err; i++) {
 		u8 data[2] = {0x00, 0x00};

 		switch (preinit_s5k4aa[i][0]) {
 		case BRIDGE:
 			err = m5602_write_bridge(sd,
 						 preinit_s5k4aa[i][1],
 						 preinit_s5k4aa[i][2]);
 			break;

 		case SENSOR:
 			data[0] = preinit_s5k4aa[i][2];
 			err = m5602_write_sensor(sd,
 						  preinit_s5k4aa[i][1],
 						  data, 1);
 			break;

 		case SENSOR_LONG:
 			data[0] = preinit_s5k4aa[i][2];
 			data[1] = preinit_s5k4aa[i][3];
 			err = m5602_write_sensor(sd,
 						  preinit_s5k4aa[i][1],
 						  data, 2);
 			break;
 		default:
 			info("Invalid stream command, exiting init");
 			return -EINVAL;
 		}
 	}

 	/* Test some registers, but we don't know their exact meaning yet */
 	if (m5602_read_sensor(sd, 0x00, prod_id, sizeof(prod_id)))
 		return -ENODEV;

 	if (memcmp(prod_id, expected_prod_id, sizeof(prod_id)))
 		return -ENODEV;
 	else
 		info("Detected a s5k4aa sensor");

 sensor_found:
 	sd->gspca_dev.cam.cam_mode = s5k4aa.modes;
 	sd->gspca_dev.cam.nmodes = s5k4aa.nmodes;
 	sd->desc->ctrls = s5k4aa.ctrls;
 	sd->desc->nctrls = s5k4aa.nctrls;

 	return 0;
 }

 int s5k4aa_init(struct sd *sd)
 {
 	int i, err = 0;

 	for (i = 0; i < ARRAY_SIZE(init_s5k4aa) && !err; i++) {
 		u8 data[2] = {0x00, 0x00};

 		switch (init_s5k4aa[i][0]) {
 		case BRIDGE:
 			err = m5602_write_bridge(sd,
 				init_s5k4aa[i][1],
 				init_s5k4aa[i][2]);
 			break;

 		case SENSOR:
 			data[0] = init_s5k4aa[i][2];
 			err = m5602_write_sensor(sd,
 				init_s5k4aa[i][1], data, 1);
 			break;

 		case SENSOR_LONG:
 			data[0] = init_s5k4aa[i][2];
 			data[1] = init_s5k4aa[i][3];
 			err = m5602_write_sensor(sd,
 				init_s5k4aa[i][1], data, 2);
 			break;
 		default:
 			info("Invalid stream command, exiting init");
 			return -EINVAL;
 		}
 	}

 	if (dump_sensor)
 		s5k4aa_dump_registers(sd);

 	if (!err && dmi_check_system(s5k4aa_vflip_dmi_table)) {
 		u8 data = 0x02;
 		info("vertical flip quirk active");
 		m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 		m5602_read_sensor(sd, S5K4AA_READ_MODE, &data, 1);
 		data |= S5K4AA_RM_V_FLIP;
 		data &= ~S5K4AA_RM_H_FLIP;
 		m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);

 		/* Decrement COLSTART to preserve color order (BGGR) */
 		m5602_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
 		data--;
 		m5602_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);

 		/* Increment ROWSTART to preserve color order (BGGR) */
 		m5602_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
 		data++;
 		m5602_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
 	}

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

 int s5k4aa_power_down(struct sd *sd)
 {
 	return 0;
 }

 int s5k4aa_get_exposure(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 data = S5K4AA_PAGE_MAP_2;
 	int err;

 	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	if (err < 0)
 		goto out;

 	err = m5602_read_sensor(sd, S5K4AA_EXPOSURE_HI, &data, 1);
 	if (err < 0)
 		goto out;

 	*val = data << 8;
 	err = m5602_read_sensor(sd, S5K4AA_EXPOSURE_LO, &data, 1);
 	*val |= data;
 	PDEBUG(D_V4L2, "Read exposure %d", *val);
 out:
 	return err;
 }

 int s5k4aa_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 data = S5K4AA_PAGE_MAP_2;
 	int err;

 	PDEBUG(D_V4L2, "Set exposure to %d", val);
 	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	if (err < 0)
 		goto out;
 	data = (val >> 8) & 0xff;
 	err = m5602_write_sensor(sd, S5K4AA_EXPOSURE_HI, &data, 1);
 	if (err < 0)
 		goto out;
 	data = val & 0xff;
 	err = m5602_write_sensor(sd, S5K4AA_EXPOSURE_LO, &data, 1);
 out:
 	return err;
 }

 int s5k4aa_get_vflip(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 data = S5K4AA_PAGE_MAP_2;
 	int err;

 	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	if (err < 0)
 		goto out;

 	err = m5602_read_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	*val = (data & S5K4AA_RM_V_FLIP) >> 7;
 	PDEBUG(D_V4L2, "Read vertical flip %d", *val);

 out:
 	return err;
 }

 int s5k4aa_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 data = S5K4AA_PAGE_MAP_2;
 	int err;

 	PDEBUG(D_V4L2, "Set vertical flip to %d", val);
 	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	if (err < 0)
 		goto out;
 	err = m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
 	if (err < 0)
 		goto out;
 	data = ((data & ~S5K4AA_RM_V_FLIP)
 			| ((val & 0x01) << 7));
 	err = m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
 	if (err < 0)
 		goto out;

 	if (val) {
 		err = m5602_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
 		if (err < 0)
 			goto out;

 		data++;
 		err = m5602_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
 	} else {
 		err = m5602_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
 		if (err < 0)
 			goto out;

 		data--;
 		err = m5602_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
 	}
 out:
 	return err;
 }

 int s5k4aa_get_hflip(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 data = S5K4AA_PAGE_MAP_2;
 	int err;

 	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	if (err < 0)
 		goto out;

 	err = m5602_read_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	*val = (data & S5K4AA_RM_H_FLIP) >> 6;
 	PDEBUG(D_V4L2, "Read horizontal flip %d", *val);
 out:
 	return err;
 }

 int s5k4aa_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 data = S5K4AA_PAGE_MAP_2;
 	int err;

 	PDEBUG(D_V4L2, "Set horizontal flip to %d",
 	       val);
 	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	if (err < 0)
 		goto out;
 	err = m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
 	if (err < 0)
 		goto out;

 	data = ((data & ~S5K4AA_RM_H_FLIP) | ((val & 0x01) << 6));
 	err = m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
 	if (err < 0)
 		goto out;

 	if (val) {
 		err = m5602_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
 		if (err < 0)
 			goto out;
 		data++;
 		err = m5602_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
 		if (err < 0)
 			goto out;
 	} else {
 		err = m5602_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
 		if (err < 0)
 			goto out;
 		data--;
 		err = m5602_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
 	}
 out:
 	return err;
 }

 int s5k4aa_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 data = S5K4AA_PAGE_MAP_2;
 	int err;

 	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	if (err < 0)
 		goto out;

 	err = m5602_read_sensor(sd, S5K4AA_GAIN_2, &data, 1);
 	*val = data;
 	PDEBUG(D_V4L2, "Read gain %d", *val);

 out:
 	return err;
 }

 int s5k4aa_set_gain(struct gspca_dev *gspca_dev, __s32 val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 data = S5K4AA_PAGE_MAP_2;
 	int err;

 	PDEBUG(D_V4L2, "Set gain to %d", val);
 	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
 	if (err < 0)
 		goto out;

 	data = val & 0xff;
 	err = m5602_write_sensor(sd, S5K4AA_GAIN_2, &data, 1);

 out:
 	return err;
 }

 static void s5k4aa_dump_registers(struct sd *sd)
 {
 	int address;
 	u8 page, old_page;
 	m5602_read_sensor(sd, S5K4AA_PAGE_MAP, &old_page, 1);
 	for (page = 0; page < 16; page++) {
 		m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &page, 1);
 		info("Dumping the s5k4aa register state for page 0x%x", page);
 		for (address = 0; address <= 0xff; address++) {
 			u8 value = 0;
 			m5602_read_sensor(sd, address, &value, 1);
 			info("register 0x%x contains 0x%x",
 			     address, value);
 		}
 	}
 	info("s5k4aa register state dump complete");

 	for (page = 0; page < 16; page++) {
 		m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &page, 1);
 		info("Probing for which registers that are "
 		     "read/write for page 0x%x", page);
 		for (address = 0; address <= 0xff; address++) {
 			u8 old_value, ctrl_value, test_value = 0xff;

 			m5602_read_sensor(sd, address, &old_value, 1);
 			m5602_write_sensor(sd, address, &test_value, 1);
 			m5602_read_sensor(sd, address, &ctrl_value, 1);

 			if (ctrl_value == test_value)
 				info("register 0x%x is writeable", address);
 			else
 				info("register 0x%x is read only", address);

 			/* Restore original value */
 			m5602_write_sensor(sd, address, &old_value, 1);
 		}
 	}
 	info("Read/write register probing complete");
 	m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &old_page, 1);
 }
	/*
	* Driver for the s5k4aa sensor
	*
	* Copyright (C) 2008 Erik Andrén
	* Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
	* Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
	*
	* Portions of code to USB interface and ALi driver software,
	* Copyright (c) 2006 Willem Duinker
	* v4l2 interface modeled after the V4L2 driver
	* for SN9C10x PC Camera Controllers
	*
	* 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, version 2.
	*
	*/

	#include "m5602_s5k4aa.h"

	static
	const
	struct dmi_system_id s5k4aa_vflip_dmi_table[] = {
	{
	.ident = "Fujitsu-Siemens Amilo Xa 2528",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
	DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Xa 2528")
	}
	}, {
	.ident = "Fujitsu-Siemens Amilo Xi 2550",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
	DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Xi 2550")
	}
	}, {
	.ident = "MSI GX700",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
	DMI_MATCH(DMI_PRODUCT_NAME, "GX700"),
	DMI_MATCH(DMI_BIOS_DATE, "07/26/2007")
	}
	}, {
	.ident = "MSI GX700/GX705/EX700",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
	DMI_MATCH(DMI_PRODUCT_NAME, "GX700/GX705/EX700")
	}
	},
	{ }
	};

	static void s5k4aa_dump_registers(struct sd *sd);

	int s5k4aa_probe(struct sd *sd)
	{
	u8 prod_id[6] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
	const u8 expected_prod_id[6] = {0x00, 0x10, 0x00, 0x4b, 0x33, 0x75};
	int i, err = 0;

	if (force_sensor) {
	if (force_sensor == S5K4AA_SENSOR) {
	info("Forcing a %s sensor", s5k4aa.name);
	goto sensor_found;
	}
	/* If we want to force another sensor, don't try to probe this
	* one */
	return -ENODEV;
	}

	info("Probing for a s5k4aa sensor");

	/* Preinit the sensor */
	for (i = 0; i < ARRAY_SIZE(preinit_s5k4aa) && !err; i++) {
	u8 data[2] = {0x00, 0x00};

	switch (preinit_s5k4aa[i][0]) {
	case BRIDGE:
	err = m5602_write_bridge(sd,
	preinit_s5k4aa[i][1],
	preinit_s5k4aa[i][2]);
	break;

	case SENSOR:
	data[0] = preinit_s5k4aa[i][2];
	err = m5602_write_sensor(sd,
	preinit_s5k4aa[i][1],
	data, 1);
	break;

	case SENSOR_LONG:
	data[0] = preinit_s5k4aa[i][2];
	data[1] = preinit_s5k4aa[i][3];
	err = m5602_write_sensor(sd,
	preinit_s5k4aa[i][1],
	data, 2);
	break;
	default:
	info("Invalid stream command, exiting init");
	return -EINVAL;
	}
	}

	/* Test some registers, but we don't know their exact meaning yet */
	if (m5602_read_sensor(sd, 0x00, prod_id, sizeof(prod_id)))
	return -ENODEV;

	if (memcmp(prod_id, expected_prod_id, sizeof(prod_id)))
	return -ENODEV;
	else
	info("Detected a s5k4aa sensor");

	sensor_found:
	sd->gspca_dev.cam.cam_mode = s5k4aa.modes;
	sd->gspca_dev.cam.nmodes = s5k4aa.nmodes;
	sd->desc->ctrls = s5k4aa.ctrls;
	sd->desc->nctrls = s5k4aa.nctrls;

	return 0;
	}

	int s5k4aa_init(struct sd *sd)
	{
	int i, err = 0;

	for (i = 0; i < ARRAY_SIZE(init_s5k4aa) && !err; i++) {
	u8 data[2] = {0x00, 0x00};

	switch (init_s5k4aa[i][0]) {
	case BRIDGE:
	err = m5602_write_bridge(sd,
	init_s5k4aa[i][1],
	init_s5k4aa[i][2]);
	break;

	case SENSOR:
	data[0] = init_s5k4aa[i][2];
	err = m5602_write_sensor(sd,
	init_s5k4aa[i][1], data, 1);
	break;

	case SENSOR_LONG:
	data[0] = init_s5k4aa[i][2];
	data[1] = init_s5k4aa[i][3];
	err = m5602_write_sensor(sd,
	init_s5k4aa[i][1], data, 2);
	break;
	default:
	info("Invalid stream command, exiting init");
	return -EINVAL;
	}
	}

	if (dump_sensor)
	s5k4aa_dump_registers(sd);

	if (!err && dmi_check_system(s5k4aa_vflip_dmi_table)) {
	u8 data = 0x02;
	info("vertical flip quirk active");
	m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	m5602_read_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	data \|= S5K4AA_RM_V_FLIP;
	data &= ~S5K4AA_RM_H_FLIP;
	m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);

	/* Decrement COLSTART to preserve color order (BGGR) */
	m5602_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
	data--;
	m5602_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);

	/* Increment ROWSTART to preserve color order (BGGR) */
	m5602_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	data++;
	m5602_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	}

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

	int s5k4aa_power_down(struct sd *sd)
	{
	return 0;
	}

	int s5k4aa_get_exposure(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
	goto out;

	err = m5602_read_sensor(sd, S5K4AA_EXPOSURE_HI, &data, 1);
	if (err < 0)
	goto out;

	*val = data << 8;
	err = m5602_read_sensor(sd, S5K4AA_EXPOSURE_LO, &data, 1);
	*val \|= data;
	PDEBUG(D_V4L2, "Read exposure %d", *val);
	out:
	return err;
	}

	int s5k4aa_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	PDEBUG(D_V4L2, "Set exposure to %d", val);
	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
	goto out;
	data = (val >> 8) & 0xff;
	err = m5602_write_sensor(sd, S5K4AA_EXPOSURE_HI, &data, 1);
	if (err < 0)
	goto out;
	data = val & 0xff;
	err = m5602_write_sensor(sd, S5K4AA_EXPOSURE_LO, &data, 1);
	out:
	return err;
	}

	int s5k4aa_get_vflip(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
	goto out;

	err = m5602_read_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	*val = (data & S5K4AA_RM_V_FLIP) >> 7;
	PDEBUG(D_V4L2, "Read vertical flip %d", *val);

	out:
	return err;
	}

	int s5k4aa_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	PDEBUG(D_V4L2, "Set vertical flip to %d", val);
	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
	goto out;
	err = m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	if (err < 0)
	goto out;
	data = ((data & ~S5K4AA_RM_V_FLIP)
	\| ((val & 0x01) << 7));
	err = m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	if (err < 0)
	goto out;

	if (val) {
	err = m5602_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	if (err < 0)
	goto out;

	data++;
	err = m5602_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	} else {
	err = m5602_read_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	if (err < 0)
	goto out;

	data--;
	err = m5602_write_sensor(sd, S5K4AA_ROWSTART_LO, &data, 1);
	}
	out:
	return err;
	}

	int s5k4aa_get_hflip(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
	goto out;

	err = m5602_read_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	*val = (data & S5K4AA_RM_H_FLIP) >> 6;
	PDEBUG(D_V4L2, "Read horizontal flip %d", *val);
	out:
	return err;
	}

	int s5k4aa_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	PDEBUG(D_V4L2, "Set horizontal flip to %d",
	val);
	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
	goto out;
	err = m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	if (err < 0)
	goto out;

	data = ((data & ~S5K4AA_RM_H_FLIP) \| ((val & 0x01) << 6));
	err = m5602_write_sensor(sd, S5K4AA_READ_MODE, &data, 1);
	if (err < 0)
	goto out;

	if (val) {
	err = m5602_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
	if (err < 0)
	goto out;
	data++;
	err = m5602_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
	if (err < 0)
	goto out;
	} else {
	err = m5602_read_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
	if (err < 0)
	goto out;
	data--;
	err = m5602_write_sensor(sd, S5K4AA_COLSTART_LO, &data, 1);
	}
	out:
	return err;
	}

	int s5k4aa_get_gain(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
	goto out;

	err = m5602_read_sensor(sd, S5K4AA_GAIN_2, &data, 1);
	*val = data;
	PDEBUG(D_V4L2, "Read gain %d", *val);

	out:
	return err;
	}

	int s5k4aa_set_gain(struct gspca_dev *gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 data = S5K4AA_PAGE_MAP_2;
	int err;

	PDEBUG(D_V4L2, "Set gain to %d", val);
	err = m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &data, 1);
	if (err < 0)
	goto out;

	data = val & 0xff;
	err = m5602_write_sensor(sd, S5K4AA_GAIN_2, &data, 1);

	out:
	return err;
	}

	static void s5k4aa_dump_registers(struct sd *sd)
	{
	int address;
	u8 page, old_page;
	m5602_read_sensor(sd, S5K4AA_PAGE_MAP, &old_page, 1);
	for (page = 0; page < 16; page++) {
	m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &page, 1);
	info("Dumping the s5k4aa register state for page 0x%x", page);
	for (address = 0; address <= 0xff; address++) {
	u8 value = 0;
	m5602_read_sensor(sd, address, &value, 1);
	info("register 0x%x contains 0x%x",
	address, value);
	}
	}
	info("s5k4aa register state dump complete");

	for (page = 0; page < 16; page++) {
	m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &page, 1);
	info("Probing for which registers that are "
	"read/write for page 0x%x", page);
	for (address = 0; address <= 0xff; address++) {
	u8 old_value, ctrl_value, test_value = 0xff;

	m5602_read_sensor(sd, address, &old_value, 1);
	m5602_write_sensor(sd, address, &test_value, 1);
	m5602_read_sensor(sd, address, &ctrl_value, 1);

	if (ctrl_value == test_value)
	info("register 0x%x is writeable", address);
	else
	info("register 0x%x is read only", address);

	/* Restore original value */
	m5602_write_sensor(sd, address, &old_value, 1);
	}
	}
	info("Read/write register probing complete");
	m5602_write_sensor(sd, S5K4AA_PAGE_MAP, &old_page, 1);
	}