/*
 * Sunplus spca561 subdriver
 *
 * Copyright (C) 2004 Michel Xhaard mxhaard@magic.fr
 *
 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
 *
 * 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
 * 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

#define MODULE_NAME "spca561"

#include <linux/input.h>
#include "gspca.h"

MODULE_AUTHOR("Michel Xhaard <mxhaard@users.sourceforge.net>");
MODULE_DESCRIPTION("GSPCA/SPCA561 USB Camera Driver");
MODULE_LICENSE("GPL");

#define EXPOSURE_MAX (2047 + 325)

/* specific webcam descriptor */
struct sd {
	struct gspca_dev gspca_dev;	/* !! must be the first item */

	struct { /* hue/contrast control cluster */
		struct v4l2_ctrl *contrast;
		struct v4l2_ctrl *hue;
	};
	struct v4l2_ctrl *autogain;

#define EXPO12A_DEF 3
	__u8 expo12a;		/* expo/gain? for rev 12a */

	__u8 chip_revision;
#define Rev012A 0
#define Rev072A 1

	signed char ag_cnt;
#define AG_CNT_START 13
};

static const struct v4l2_pix_format sif_012a_mode[] = {
	{160, 120, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
		.bytesperline = 160,
		.sizeimage = 160 * 120,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 3},
	{176, 144, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
		.bytesperline = 176,
		.sizeimage = 176 * 144,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 2},
	{320, 240, V4L2_PIX_FMT_SPCA561, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240 * 4 / 8,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 1},
	{352, 288, V4L2_PIX_FMT_SPCA561, V4L2_FIELD_NONE,
		.bytesperline = 352,
		.sizeimage = 352 * 288 * 4 / 8,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
};

static const struct v4l2_pix_format sif_072a_mode[] = {
	{160, 120, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
		.bytesperline = 160,
		.sizeimage = 160 * 120,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 3},
	{176, 144, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
		.bytesperline = 176,
		.sizeimage = 176 * 144,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 2},
	{320, 240, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 1},
	{352, 288, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
		.bytesperline = 352,
		.sizeimage = 352 * 288,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
};

/*
 * Initialization data
 * I'm not very sure how to split initialization from open data
 * chunks. For now, we'll consider everything as initialization
 */
/* Frame packet header offsets for the spca561 */
#define SPCA561_OFFSET_SNAP 1
#define SPCA561_OFFSET_TYPE 2
#define SPCA561_OFFSET_COMPRESS 3
#define SPCA561_OFFSET_FRAMSEQ   4
#define SPCA561_OFFSET_GPIO 5
#define SPCA561_OFFSET_USBBUFF 6
#define SPCA561_OFFSET_WIN2GRAVE 7
#define SPCA561_OFFSET_WIN2RAVE 8
#define SPCA561_OFFSET_WIN2BAVE 9
#define SPCA561_OFFSET_WIN2GBAVE 10
#define SPCA561_OFFSET_WIN1GRAVE 11
#define SPCA561_OFFSET_WIN1RAVE 12
#define SPCA561_OFFSET_WIN1BAVE 13
#define SPCA561_OFFSET_WIN1GBAVE 14
#define SPCA561_OFFSET_FREQ 15
#define SPCA561_OFFSET_VSYNC 16
#define SPCA561_INDEX_I2C_BASE 0x8800
#define SPCA561_SNAPBIT 0x20
#define SPCA561_SNAPCTRL 0x40

static const u16 rev72a_reset[][2] = {
	{0x0000, 0x8114},	/* Software GPIO output data */
	{0x0001, 0x8114},	/* Software GPIO output data */
	{0x0000, 0x8112},	/* Some kind of reset */
	{}
};
static const __u16 rev72a_init_data1[][2] = {
	{0x0003, 0x8701},	/* PCLK clock delay adjustment */
	{0x0001, 0x8703},	/* HSYNC from cmos inverted */
	{0x0011, 0x8118},	/* Enable and conf sensor */
	{0x0001, 0x8118},	/* Conf sensor */
	{0x0092, 0x8804},	/* I know nothing about these */
	{0x0010, 0x8802},	/* 0x88xx registers, so I won't */
	{}
};
static const u16 rev72a_init_sensor1[][2] = {
	{0x0001, 0x000d},
	{0x0002, 0x0018},
	{0x0004, 0x0165},
	{0x0005, 0x0021},
	{0x0007, 0x00aa},
	{0x0020, 0x1504},
	{0x0039, 0x0002},
	{0x0035, 0x0010},
	{0x0009, 0x1049},
	{0x0028, 0x000b},
	{0x003b, 0x000f},
	{0x003c, 0x0000},
	{}
};
static const __u16 rev72a_init_data2[][2] = {
	{0x0018, 0x8601},	/* Pixel/line selection for color separation */
	{0x0000, 0x8602},	/* Optical black level for user setting */
	{0x0060, 0x8604},	/* Optical black horizontal offset */
	{0x0002, 0x8605},	/* Optical black vertical offset */
	{0x0000, 0x8603},	/* Non-automatic optical black level */
	{0x0002, 0x865b},	/* Horizontal offset for valid pixels */
	{0x0000, 0x865f},	/* Vertical valid pixels window (x2) */
	{0x00b0, 0x865d},	/* Horizontal valid pixels window (x2) */
	{0x0090, 0x865e},	/* Vertical valid lines window (x2) */
	{0x00e0, 0x8406},	/* Memory buffer threshold */
	{0x0000, 0x8660},	/* Compensation memory stuff */
	{0x0002, 0x8201},	/* Output address for r/w serial EEPROM */
	{0x0008, 0x8200},	/* Clear valid bit for serial EEPROM */
	{0x0001, 0x8200},	/* OprMode to be executed by hardware */
/* from ms-win */
	{0x0000, 0x8611},	/* R offset for white balance */
	{0x00fd, 0x8612},	/* Gr offset for white balance */
	{0x0003, 0x8613},	/* B offset for white balance */
	{0x0000, 0x8614},	/* Gb offset for white balance */
/* from ms-win */
	{0x0035, 0x8651},	/* R gain for white balance */
	{0x0040, 0x8652},	/* Gr gain for white balance */
	{0x005f, 0x8653},	/* B gain for white balance */
	{0x0040, 0x8654},	/* Gb gain for white balance */
	{0x0002, 0x8502},	/* Maximum average bit rate stuff */
	{0x0011, 0x8802},

	{0x0087, 0x8700},	/* Set master clock (96Mhz????) */
	{0x0081, 0x8702},	/* Master clock output enable */

	{0x0000, 0x8500},	/* Set image type (352x288 no compression) */
	/* Originally was 0x0010 (352x288 compression) */

	{0x0002, 0x865b},	/* Horizontal offset for valid pixels */
	{0x0003, 0x865c},	/* Vertical offset for valid lines */
	{}
};
static const u16 rev72a_init_sensor2[][2] = {
	{0x0003, 0x0121},
	{0x0004, 0x0165},
	{0x0005, 0x002f},	/* blanking control column */
	{0x0006, 0x0000},	/* blanking mode row*/
	{0x000a, 0x0002},
	{0x0009, 0x1061},	/* setexposure times && pixel clock
				 * 0001 0 | 000 0110 0001 */
	{0x0035, 0x0014},
	{}
};

/******************** QC Express etch2 stuff ********************/
static const __u16 Pb100_1map8300[][2] = {
	/* reg, value */
	{0x8320, 0x3304},

	{0x8303, 0x0125},	/* image area */
	{0x8304, 0x0169},
	{0x8328, 0x000b},
	{0x833c, 0x0001},		/*fixme: win:07*/

	{0x832f, 0x1904},		/*fixme: was 0419*/
	{0x8307, 0x00aa},
	{0x8301, 0x0003},
	{0x8302, 0x000e},
	{}
};
static const __u16 Pb100_2map8300[][2] = {
	/* reg, value */
	{0x8339, 0x0000},
	{0x8307, 0x00aa},
	{}
};

static const __u16 spca561_161rev12A_data1[][2] = {
	{0x29, 0x8118},		/* Control register (various enable bits) */
	{0x08, 0x8114},		/* GPIO: Led off */
	{0x0e, 0x8112},		/* 0x0e stream off 0x3e stream on */
	{0x00, 0x8102},		/* white balance - new */
	{0x92, 0x8804},
	{0x04, 0x8802},		/* windows uses 08 */
	{}
};
static const __u16 spca561_161rev12A_data2[][2] = {
	{0x21, 0x8118},
	{0x10, 0x8500},
	{0x07, 0x8601},
	{0x07, 0x8602},
	{0x04, 0x8501},

	{0x07, 0x8201},		/* windows uses 02 */
	{0x08, 0x8200},
	{0x01, 0x8200},

	{0x90, 0x8604},
	{0x00, 0x8605},
	{0xb0, 0x8603},

	/* sensor gains */
	{0x07, 0x8601},		/* white balance - new */
	{0x07, 0x8602},		/* white balance - new */
	{0x00, 0x8610},		/* *red */
	{0x00, 0x8611},		/* 3f   *green */
	{0x00, 0x8612},		/* green *blue */
	{0x00, 0x8613},		/* blue *green */
	{0x43, 0x8614},		/* green *red - white balance - was 0x35 */
	{0x40, 0x8615},		/* 40   *green - white balance - was 0x35 */
	{0x71, 0x8616},		/* 7a   *blue - white balance - was 0x35 */
	{0x40, 0x8617},		/* 40   *green - white balance - was 0x35 */

	{0x0c, 0x8620},		/* 0c */
	{0xc8, 0x8631},		/* c8 */
	{0xc8, 0x8634},		/* c8 */
	{0x23, 0x8635},		/* 23 */
	{0x1f, 0x8636},		/* 1f */
	{0xdd, 0x8637},		/* dd */
	{0xe1, 0x8638},		/* e1 */
	{0x1d, 0x8639},		/* 1d */
	{0x21, 0x863a},		/* 21 */
	{0xe3, 0x863b},		/* e3 */
	{0xdf, 0x863c},		/* df */
	{0xf0, 0x8505},
	{0x32, 0x850a},
/*	{0x99, 0x8700},		 * - white balance - new (removed) */
	/* HDG we used to do this in stop0, making the init state and the state
	   after a start / stop different, so do this here instead. */
	{0x29, 0x8118},
	{}
};

static void reg_w_val(struct gspca_dev *gspca_dev, __u16 index, __u8 value)
{
	int ret;
	struct usb_device *dev = gspca_dev->dev;

	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			      0,		/* request */
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      value, index, NULL, 0, 500);
	PDEBUG(D_USBO, "reg write: 0x%02x:0x%02x", index, value);
	if (ret < 0)
		pr_err("reg write: error %d\n", ret);
}

static void write_vector(struct gspca_dev *gspca_dev,
			const __u16 data[][2])
{
	int i;

	i = 0;
	while (data[i][1] != 0) {
		reg_w_val(gspca_dev, data[i][1], data[i][0]);
		i++;
	}
}

/* read 'len' bytes to gspca_dev->usb_buf */
static void reg_r(struct gspca_dev *gspca_dev,
		  __u16 index, __u16 length)
{
	usb_control_msg(gspca_dev->dev,
			usb_rcvctrlpipe(gspca_dev->dev, 0),
			0,			/* request */
			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0,			/* value */
			index, gspca_dev->usb_buf, length, 500);
}

/* write 'len' bytes from gspca_dev->usb_buf */
static void reg_w_buf(struct gspca_dev *gspca_dev,
		      __u16 index, __u16 len)
{
	usb_control_msg(gspca_dev->dev,
			usb_sndctrlpipe(gspca_dev->dev, 0),
			0,			/* request */
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0,			/* value */
			index, gspca_dev->usb_buf, len, 500);
}

static void i2c_write(struct gspca_dev *gspca_dev, __u16 value, __u16 reg)
{
	int retry = 60;

	reg_w_val(gspca_dev, 0x8801, reg);
	reg_w_val(gspca_dev, 0x8805, value);
	reg_w_val(gspca_dev, 0x8800, value >> 8);
	do {
		reg_r(gspca_dev, 0x8803, 1);
		if (!gspca_dev->usb_buf[0])
			return;
		msleep(10);
	} while (--retry);
}

static int i2c_read(struct gspca_dev *gspca_dev, __u16 reg, __u8 mode)
{
	int retry = 60;
	__u8 value;

	reg_w_val(gspca_dev, 0x8804, 0x92);
	reg_w_val(gspca_dev, 0x8801, reg);
	reg_w_val(gspca_dev, 0x8802, mode | 0x01);
	do {
		reg_r(gspca_dev, 0x8803, 1);
		if (!gspca_dev->usb_buf[0]) {
			reg_r(gspca_dev, 0x8800, 1);
			value = gspca_dev->usb_buf[0];
			reg_r(gspca_dev, 0x8805, 1);
			return ((int) value << 8) | gspca_dev->usb_buf[0];
		}
		msleep(10);
	} while (--retry);
	return -1;
}

static void sensor_mapwrite(struct gspca_dev *gspca_dev,
			    const __u16 (*sensormap)[2])
{
	while ((*sensormap)[0]) {
		gspca_dev->usb_buf[0] = (*sensormap)[1];
		gspca_dev->usb_buf[1] = (*sensormap)[1] >> 8;
		reg_w_buf(gspca_dev, (*sensormap)[0], 2);
		sensormap++;
	}
}

static void write_sensor_72a(struct gspca_dev *gspca_dev,
			    const __u16 (*sensor)[2])
{
	while ((*sensor)[0]) {
		i2c_write(gspca_dev, (*sensor)[1], (*sensor)[0]);
		sensor++;
	}
}

static void init_161rev12A(struct gspca_dev *gspca_dev)
{
	write_vector(gspca_dev, spca561_161rev12A_data1);
	sensor_mapwrite(gspca_dev, Pb100_1map8300);
/*fixme: should be in sd_start*/
	write_vector(gspca_dev, spca561_161rev12A_data2);
	sensor_mapwrite(gspca_dev, Pb100_2map8300);
}

/* this function is called at probe time */
static int sd_config(struct gspca_dev *gspca_dev,
		     const struct usb_device_id *id)
{
	struct sd *sd = (struct sd *) gspca_dev;
	struct cam *cam;
	__u16 vendor, product;
	__u8 data1, data2;

	/* Read frm global register the USB product and vendor IDs, just to
	 * prove that we can communicate with the device.  This works, which
	 * confirms at we are communicating properly and that the device
	 * is a 561. */
	reg_r(gspca_dev, 0x8104, 1);
	data1 = gspca_dev->usb_buf[0];
	reg_r(gspca_dev, 0x8105, 1);
	data2 = gspca_dev->usb_buf[0];
	vendor = (data2 << 8) | data1;
	reg_r(gspca_dev, 0x8106, 1);
	data1 = gspca_dev->usb_buf[0];
	reg_r(gspca_dev, 0x8107, 1);
	data2 = gspca_dev->usb_buf[0];
	product = (data2 << 8) | data1;
	if (vendor != id->idVendor || product != id->idProduct) {
		PDEBUG(D_PROBE, "Bad vendor / product from device");
		return -EINVAL;
	}

	cam = &gspca_dev->cam;
	cam->needs_full_bandwidth = 1;

	sd->chip_revision = id->driver_info;
	if (sd->chip_revision == Rev012A) {
		cam->cam_mode = sif_012a_mode;
		cam->nmodes = ARRAY_SIZE(sif_012a_mode);
	} else {
		cam->cam_mode = sif_072a_mode;
		cam->nmodes = ARRAY_SIZE(sif_072a_mode);
	}
	sd->expo12a = EXPO12A_DEF;
	return 0;
}

/* this function is called at probe and resume time */
static int sd_init_12a(struct gspca_dev *gspca_dev)
{
	PDEBUG(D_STREAM, "Chip revision: 012a");
	init_161rev12A(gspca_dev);
	return 0;
}
static int sd_init_72a(struct gspca_dev *gspca_dev)
{
	PDEBUG(D_STREAM, "Chip revision: 072a");
	write_vector(gspca_dev, rev72a_reset);
	msleep(200);
	write_vector(gspca_dev, rev72a_init_data1);
	write_sensor_72a(gspca_dev, rev72a_init_sensor1);
	write_vector(gspca_dev, rev72a_init_data2);
	write_sensor_72a(gspca_dev, rev72a_init_sensor2);
	reg_w_val(gspca_dev, 0x8112, 0x30);
	return 0;
}

static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;
	__u16 reg;

	if (sd->chip_revision == Rev012A)
		reg = 0x8610;
	else
		reg = 0x8611;

	reg_w_val(gspca_dev, reg + 0, val);		/* R */
	reg_w_val(gspca_dev, reg + 1, val);		/* Gr */
	reg_w_val(gspca_dev, reg + 2, val);		/* B */
	reg_w_val(gspca_dev, reg + 3, val);		/* Gb */
}

static void setwhite(struct gspca_dev *gspca_dev, s32 white, s32 contrast)
{
	struct sd *sd = (struct sd *) gspca_dev;
	__u8 blue, red;
	__u16 reg;

	/* try to emulate MS-win as possible */
	red = 0x20 + white * 3 / 8;
	blue = 0x90 - white * 5 / 8;
	if (sd->chip_revision == Rev012A) {
		reg = 0x8614;
	} else {
		reg = 0x8651;
		red += contrast - 0x20;
		blue += contrast - 0x20;
		reg_w_val(gspca_dev, 0x8652, contrast + 0x20); /* Gr */
		reg_w_val(gspca_dev, 0x8654, contrast + 0x20); /* Gb */
	}
	reg_w_val(gspca_dev, reg, red);
	reg_w_val(gspca_dev, reg + 2, blue);
}

/* rev 12a only */
static void setexposure(struct gspca_dev *gspca_dev, s32 val)
{
	int i, expo = 0;

	/* Register 0x8309 controls exposure for the spca561,
	   the basic exposure setting goes from 1-2047, where 1 is completely
	   dark and 2047 is very bright. It not only influences exposure but
	   also the framerate (to allow for longer exposure) from 1 - 300 it
	   only raises the exposure time then from 300 - 600 it halves the
	   framerate to be able to further raise the exposure time and for every
	   300 more it halves the framerate again. This allows for a maximum
	   exposure time of circa 0.2 - 0.25 seconds (30 / (2000/3000) fps).
	   Sometimes this is not enough, the 1-2047 uses bits 0-10, bits 11-12
	   configure a divider for the base framerate which us used at the
	   exposure setting of 1-300. These bits configure the base framerate
	   according to the following formula: fps = 60 / (value + 2) */

	/* We choose to use the high bits setting the fixed framerate divisor
	   asap, as setting high basic exposure setting without the fixed
	   divider in combination with high gains makes the cam stop */
	int table[] =  { 0, 450, 550, 625, EXPOSURE_MAX };

	for (i = 0; i < ARRAY_SIZE(table) - 1; i++) {
		if (val <= table[i + 1]) {
			expo  = val - table[i];
			if (i)
				expo += 300;
			expo |= i << 11;
			break;
		}
	}

	gspca_dev->usb_buf[0] = expo;
	gspca_dev->usb_buf[1] = expo >> 8;
	reg_w_buf(gspca_dev, 0x8309, 2);
}

/* rev 12a only */
static void setgain(struct gspca_dev *gspca_dev, s32 val)
{
	/* gain reg low 6 bits  0-63 gain, bit 6 and 7, both double the
	   sensitivity when set, so 31 + one of them set == 63, and 15
	   with both of them set == 63 */
	if (val < 64)
		gspca_dev->usb_buf[0] = val;
	else if (val < 128)
		gspca_dev->usb_buf[0] = (val / 2) | 0x40;
	else
		gspca_dev->usb_buf[0] = (val / 4) | 0xc0;

	gspca_dev->usb_buf[1] = 0;
	reg_w_buf(gspca_dev, 0x8335, 2);
}

static void setautogain(struct gspca_dev *gspca_dev, s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	if (val)
		sd->ag_cnt = AG_CNT_START;
	else
		sd->ag_cnt = -1;
}

static int sd_start_12a(struct gspca_dev *gspca_dev)
{
	int mode;
	static const __u8 Reg8391[8] =
		{0x92, 0x30, 0x20, 0x00, 0x0c, 0x00, 0x00, 0x00};

	mode = gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv;
	if (mode <= 1) {
		/* Use compression on 320x240 and above */
		reg_w_val(gspca_dev, 0x8500, 0x10 | mode);
	} else {
		/* I couldn't get the compression to work below 320x240
		 * Fortunately at these resolutions the bandwidth
		 * is sufficient to push raw frames at ~20fps */
		reg_w_val(gspca_dev, 0x8500, mode);
	}		/* -- qq@kuku.eu.org */

	gspca_dev->usb_buf[0] = 0xaa;
	gspca_dev->usb_buf[1] = 0x00;
	reg_w_buf(gspca_dev, 0x8307, 2);
	/* clock - lower 0x8X values lead to fps > 30 */
	reg_w_val(gspca_dev, 0x8700, 0x8a);
					/* 0x8f 0x85 0x27 clock */
	reg_w_val(gspca_dev, 0x8112, 0x1e | 0x20);
	reg_w_val(gspca_dev, 0x850b, 0x03);
	memcpy(gspca_dev->usb_buf, Reg8391, 8);
	reg_w_buf(gspca_dev, 0x8391, 8);
	reg_w_buf(gspca_dev, 0x8390, 8);

	/* Led ON (bit 3 -> 0 */
	reg_w_val(gspca_dev, 0x8114, 0x00);
	return 0;
}
static int sd_start_72a(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int Clck;
	int mode;

	write_vector(gspca_dev, rev72a_reset);
	msleep(200);
	write_vector(gspca_dev, rev72a_init_data1);
	write_sensor_72a(gspca_dev, rev72a_init_sensor1);

	mode = gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv;
	switch (mode) {
	default:
	case 0:
		Clck = 0x27;		/* ms-win 0x87 */
		break;
	case 1:
		Clck = 0x25;
		break;
	case 2:
		Clck = 0x22;
		break;
	case 3:
		Clck = 0x21;
		break;
	}
	reg_w_val(gspca_dev, 0x8700, Clck);	/* 0x27 clock */
	reg_w_val(gspca_dev, 0x8702, 0x81);
	reg_w_val(gspca_dev, 0x8500, mode);	/* mode */
	write_sensor_72a(gspca_dev, rev72a_init_sensor2);
	setwhite(gspca_dev, v4l2_ctrl_g_ctrl(sd->hue),
			v4l2_ctrl_g_ctrl(sd->contrast));
/*	setbrightness(gspca_dev);	 * fixme: bad values */
	setautogain(gspca_dev, v4l2_ctrl_g_ctrl(sd->autogain));
	reg_w_val(gspca_dev, 0x8112, 0x10 | 0x20);
	return 0;
}

static void sd_stopN(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	if (sd->chip_revision == Rev012A) {
		reg_w_val(gspca_dev, 0x8112, 0x0e);
		/* Led Off (bit 3 -> 1 */
		reg_w_val(gspca_dev, 0x8114, 0x08);
	} else {
		reg_w_val(gspca_dev, 0x8112, 0x20);
/*		reg_w_val(gspca_dev, 0x8102, 0x00); ?? */
	}
}

static void do_autogain(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int expotimes;
	int pixelclk;
	int gainG;
	__u8 R, Gr, Gb, B;
	int y;
	__u8 luma_mean = 110;
	__u8 luma_delta = 20;
	__u8 spring = 4;

	if (sd->ag_cnt < 0)
		return;
	if (--sd->ag_cnt >= 0)
		return;
	sd->ag_cnt = AG_CNT_START;

	switch (sd->chip_revision) {
	case Rev072A:
		reg_r(gspca_dev, 0x8621, 1);
		Gr = gspca_dev->usb_buf[0];
		reg_r(gspca_dev, 0x8622, 1);
		R = gspca_dev->usb_buf[0];
		reg_r(gspca_dev, 0x8623, 1);
		B = gspca_dev->usb_buf[0];
		reg_r(gspca_dev, 0x8624, 1);
		Gb = gspca_dev->usb_buf[0];
		y = (77 * R + 75 * (Gr + Gb) + 29 * B) >> 8;
		/* u= (128*B-(43*(Gr+Gb+R))) >> 8; */
		/* v= (128*R-(53*(Gr+Gb))-21*B) >> 8; */
		/* PDEBUG(D_CONF,"reading Y %d U %d V %d ",y,u,v); */

		if (y < luma_mean - luma_delta ||
		    y > luma_mean + luma_delta) {
			expotimes = i2c_read(gspca_dev, 0x09, 0x10);
			pixelclk = 0x0800;
			expotimes = expotimes & 0x07ff;
			/* PDEBUG(D_PACK,
				"Exposition Times 0x%03X Clock 0x%04X ",
				expotimes,pixelclk); */
			gainG = i2c_read(gspca_dev, 0x35, 0x10);
			/* PDEBUG(D_PACK,
				"reading Gain register %d", gainG); */

			expotimes += (luma_mean - y) >> spring;
			gainG += (luma_mean - y) / 50;
			/* PDEBUG(D_PACK,
				"compute expotimes %d gain %d",
				expotimes,gainG); */

			if (gainG > 0x3f)
				gainG = 0x3f;
			else if (gainG < 3)
				gainG = 3;
			i2c_write(gspca_dev, gainG, 0x35);

			if (expotimes > 0x0256)
				expotimes = 0x0256;
			else if (expotimes < 3)
				expotimes = 3;
			i2c_write(gspca_dev, expotimes | pixelclk, 0x09);
		}
		break;
	}
}

static void sd_pkt_scan(struct gspca_dev *gspca_dev,
			u8 *data,		/* isoc packet */
			int len)		/* iso packet length */
{
	struct sd *sd = (struct sd *) gspca_dev;

	len--;
	switch (*data++) {			/* sequence number */
	case 0:					/* start of frame */
		gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);

		/* This should never happen */
		if (len < 2) {
			PERR("Short SOF packet, ignoring");
			gspca_dev->last_packet_type = DISCARD_PACKET;
			return;
		}

#if IS_ENABLED(CONFIG_INPUT)
		if (data[0] & 0x20) {
			input_report_key(gspca_dev->input_dev, KEY_CAMERA, 1);
			input_sync(gspca_dev->input_dev);
			input_report_key(gspca_dev->input_dev, KEY_CAMERA, 0);
			input_sync(gspca_dev->input_dev);
		}
#endif

		if (data[1] & 0x10) {
			/* compressed bayer */
			gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
		} else {
			/* raw bayer (with a header, which we skip) */
			if (sd->chip_revision == Rev012A) {
				data += 20;
				len -= 20;
			} else {
				data += 16;
				len -= 16;
			}
			gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
		}
		return;
	case 0xff:			/* drop (empty mpackets) */
		return;
	}
	gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
}

static int sd_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct gspca_dev *gspca_dev =
		container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
	struct sd *sd = (struct sd *)gspca_dev;

	gspca_dev->usb_err = 0;

	if (!gspca_dev->streaming)
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		setbrightness(gspca_dev, ctrl->val);
		break;
	case V4L2_CID_CONTRAST:
		/* hue/contrast control cluster for 72a */
		setwhite(gspca_dev, sd->hue->val, ctrl->val);
		break;
	case V4L2_CID_HUE:
		/* just plain hue control for 12a */
		setwhite(gspca_dev, ctrl->val, 0);
		break;
	case V4L2_CID_EXPOSURE:
		setexposure(gspca_dev, ctrl->val);
		break;
	case V4L2_CID_GAIN:
		setgain(gspca_dev, ctrl->val);
		break;
	case V4L2_CID_AUTOGAIN:
		setautogain(gspca_dev, ctrl->val);
		break;
	}
	return gspca_dev->usb_err;
}

static const struct v4l2_ctrl_ops sd_ctrl_ops = {
	.s_ctrl = sd_s_ctrl,
};

static int sd_init_controls_12a(struct gspca_dev *gspca_dev)
{
	struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;

	gspca_dev->vdev.ctrl_handler = hdl;
	v4l2_ctrl_handler_init(hdl, 3);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
			V4L2_CID_HUE, 1, 0x7f, 1, 0x40);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
			V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
			V4L2_CID_EXPOSURE, 1, EXPOSURE_MAX, 1, 700);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
			V4L2_CID_GAIN, 0, 255, 1, 63);

	if (hdl->error) {
		pr_err("Could not initialize controls\n");
		return hdl->error;
	}
	return 0;
}

static int sd_init_controls_72a(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *)gspca_dev;
	struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;

	gspca_dev->vdev.ctrl_handler = hdl;
	v4l2_ctrl_handler_init(hdl, 4);
	sd->contrast = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
			V4L2_CID_CONTRAST, 0, 0x3f, 1, 0x20);
	sd->hue = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
			V4L2_CID_HUE, 1, 0x7f, 1, 0x40);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
			V4L2_CID_BRIGHTNESS, 0, 0x3f, 1, 0x20);
	sd->autogain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
			V4L2_CID_AUTOGAIN, 0, 1, 1, 1);

	if (hdl->error) {
		pr_err("Could not initialize controls\n");
		return hdl->error;
	}
	v4l2_ctrl_cluster(2, &sd->contrast);
	return 0;
}

/* sub-driver description */
static const struct sd_desc sd_desc_12a = {
	.name = MODULE_NAME,
	.init_controls = sd_init_controls_12a,
	.config = sd_config,
	.init = sd_init_12a,
	.start = sd_start_12a,
	.stopN = sd_stopN,
	.pkt_scan = sd_pkt_scan,
#if IS_ENABLED(CONFIG_INPUT)
	.other_input = 1,
#endif
};
static const struct sd_desc sd_desc_72a = {
	.name = MODULE_NAME,
	.init_controls = sd_init_controls_72a,
	.config = sd_config,
	.init = sd_init_72a,
	.start = sd_start_72a,
	.stopN = sd_stopN,
	.pkt_scan = sd_pkt_scan,
	.dq_callback = do_autogain,
#if IS_ENABLED(CONFIG_INPUT)
	.other_input = 1,
#endif
};
static const struct sd_desc *sd_desc[2] = {
	&sd_desc_12a,
	&sd_desc_72a
};

/* -- module initialisation -- */
static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x041e, 0x401a), .driver_info = Rev072A},
	{USB_DEVICE(0x041e, 0x403b), .driver_info = Rev012A},
	{USB_DEVICE(0x0458, 0x7004), .driver_info = Rev072A},
	{USB_DEVICE(0x0461, 0x0815), .driver_info = Rev072A},
	{USB_DEVICE(0x046d, 0x0928), .driver_info = Rev012A},
	{USB_DEVICE(0x046d, 0x0929), .driver_info = Rev012A},
	{USB_DEVICE(0x046d, 0x092a), .driver_info = Rev012A},
	{USB_DEVICE(0x046d, 0x092b), .driver_info = Rev012A},
	{USB_DEVICE(0x046d, 0x092c), .driver_info = Rev012A},
	{USB_DEVICE(0x046d, 0x092d), .driver_info = Rev012A},
	{USB_DEVICE(0x046d, 0x092e), .driver_info = Rev012A},
	{USB_DEVICE(0x046d, 0x092f), .driver_info = Rev012A},
	{USB_DEVICE(0x04fc, 0x0561), .driver_info = Rev072A},
	{USB_DEVICE(0x060b, 0xa001), .driver_info = Rev072A},
	{USB_DEVICE(0x10fd, 0x7e50), .driver_info = Rev072A},
	{USB_DEVICE(0xabcd, 0xcdee), .driver_info = Rev072A},
	{}
};

MODULE_DEVICE_TABLE(usb, device_table);

/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
		    const struct usb_device_id *id)
{
	return gspca_dev_probe(intf, id,
				sd_desc[id->driver_info],
				sizeof(struct sd),
			       THIS_MODULE);
}

static struct usb_driver sd_driver = {
	.name = MODULE_NAME,
	.id_table = device_table,
	.probe = sd_probe,
	.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
	.suspend = gspca_suspend,
	.resume = gspca_resume,
	.reset_resume = gspca_resume,
#endif
};

module_usb_driver(sd_driver);