/*
 *		Pixart PAC7311 library
 *		Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
 *
 * 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 MODULE_NAME "pac7311"

#include "gspca.h"
#include "jpeg.h"

MODULE_AUTHOR("Thomas Kaiser thomas@kaiser-linux.li");
MODULE_DESCRIPTION("Pixart PAC7311");
MODULE_LICENSE("GPL");

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

	int lum_sum;
	atomic_t avg_lum;
	atomic_t do_gain;

	unsigned char brightness;
	unsigned char contrast;
	unsigned char colors;
	unsigned char autogain;

	char tosof;	/* number of bytes before next start of frame */
	signed char ag_cnt;
#define AG_CNT_START 13

	__u8 sensor;
#define SENSOR_PAC7302 0
#define SENSOR_PAC7311 1
};

/* V4L2 controls supported by the driver */
static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setcontrast(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getcontrast(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setcolors(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getcolors(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getautogain(struct gspca_dev *gspca_dev, __s32 *val);

static struct ctrl sd_ctrls[] = {
	{
	    {
		.id      = V4L2_CID_BRIGHTNESS,
		.type    = V4L2_CTRL_TYPE_INTEGER,
		.name    = "Brightness",
		.minimum = 0,
#define BRIGHTNESS_MAX 0x20
		.maximum = BRIGHTNESS_MAX,
		.step    = 1,
#define BRIGHTNESS_DEF 0x10
		.default_value = BRIGHTNESS_DEF,
	    },
	    .set = sd_setbrightness,
	    .get = sd_getbrightness,
	},
	{
	    {
		.id      = V4L2_CID_CONTRAST,
		.type    = V4L2_CTRL_TYPE_INTEGER,
		.name    = "Contrast",
		.minimum = 0,
#define CONTRAST_MAX 255
		.maximum = CONTRAST_MAX,
		.step    = 1,
#define CONTRAST_DEF 60
		.default_value = CONTRAST_DEF,
	    },
	    .set = sd_setcontrast,
	    .get = sd_getcontrast,
	},
	{
	    {
		.id      = V4L2_CID_SATURATION,
		.type    = V4L2_CTRL_TYPE_INTEGER,
		.name    = "Saturation",
		.minimum = 0,
		.maximum = 255,
		.step    = 1,
#define COLOR_DEF 127
		.default_value = COLOR_DEF,
	    },
	    .set = sd_setcolors,
	    .get = sd_getcolors,
	},
	{
	    {
		.id      = V4L2_CID_AUTOGAIN,
		.type    = V4L2_CTRL_TYPE_BOOLEAN,
		.name    = "Auto Gain",
		.minimum = 0,
		.maximum = 1,
		.step    = 1,
#define AUTOGAIN_DEF 1
		.default_value = AUTOGAIN_DEF,
	    },
	    .set = sd_setautogain,
	    .get = sd_getautogain,
	},
};

static struct v4l2_pix_format vga_mode[] = {
	{160, 120, V4L2_PIX_FMT_PJPG, V4L2_FIELD_NONE,
		.bytesperline = 160,
		.sizeimage = 160 * 120 * 3 / 8 + 590,
		.colorspace = V4L2_COLORSPACE_JPEG,
		.priv = 2},
	{320, 240, V4L2_PIX_FMT_PJPG, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240 * 3 / 8 + 590,
		.colorspace = V4L2_COLORSPACE_JPEG,
		.priv = 1},
	{640, 480, V4L2_PIX_FMT_PJPG, V4L2_FIELD_NONE,
		.bytesperline = 640,
		.sizeimage = 640 * 480 * 3 / 8 + 590,
		.colorspace = V4L2_COLORSPACE_JPEG,
		.priv = 0},
};

/* pac 7302 */
static const __u8 probe_7302[] = {
/*	index,value */
	0xff, 0x01,		/* page 1 */
	0x78, 0x00,		/* deactivate */
	0xff, 0x01,
	0x78, 0x40,		/* led off */
};
static const __u8 start_7302[] = {
/*	index, len, [value]* */
	0xff, 1,	0x00,		/* page 0 */
	0x00, 12,	0x01, 0x40, 0x40, 0x40, 0x01, 0xe0, 0x02, 0x80,
			0x00, 0x00, 0x00, 0x00,
	0x0d, 24,	0x03, 0x01, 0x00, 0xb5, 0x07, 0xcb, 0x00, 0x00,
			0x07, 0xc8, 0x00, 0xea, 0x07, 0xcf, 0x07, 0xf7,
			0x07, 0x7e, 0x01, 0x0b, 0x00, 0x00, 0x00, 0x11,
	0x26, 2,	0xaa, 0xaa,
	0x2e, 1,	0x31,
	0x38, 1,	0x01,
	0x3a, 3,	0x14, 0xff, 0x5a,
	0x43, 11,	0x00, 0x0a, 0x18, 0x11, 0x01, 0x2c, 0x88, 0x11,
			0x00, 0x54, 0x11,
	0x55, 1,	0x00,
	0x62, 4, 	0x10, 0x1e, 0x1e, 0x18,
	0x6b, 1,	0x00,
	0x6e, 3,	0x08, 0x06, 0x00,
	0x72, 3,	0x00, 0xff, 0x00,
	0x7d, 23,	0x01, 0x01, 0x58, 0x46, 0x50, 0x3c, 0x50, 0x3c,
			0x54, 0x46, 0x54, 0x56, 0x52, 0x50, 0x52, 0x50,
			0x56, 0x64, 0xa4, 0x00, 0xda, 0x00, 0x00,
	0xa2, 10,	0x22, 0x2c, 0x3c, 0x54, 0x69, 0x7c, 0x9c, 0xb9,
			0xd2, 0xeb,
	0xaf, 1,	0x02,
	0xb5, 2,	0x08, 0x08,
	0xb8, 2,	0x08, 0x88,
	0xc4, 4,	0xae, 0x01, 0x04, 0x01,
	0xcc, 1,	0x00,
	0xd1, 11,	0x01, 0x30, 0x49, 0x5e, 0x6f, 0x7f, 0x8e, 0xa9,
			0xc1, 0xd7, 0xec,
	0xdc, 1,	0x01,
	0xff, 1,	0x01,		/* page 1 */
	0x12, 3,	0x02, 0x00, 0x01,
	0x3e, 2,	0x00, 0x00,
	0x76, 5,	0x01, 0x20, 0x40, 0x00, 0xf2,
	0x7c, 1,	0x00,
	0x7f, 10,	0x4b, 0x0f, 0x01, 0x2c, 0x02, 0x58, 0x03, 0x20,
			0x02, 0x00,
	0x96, 5,	0x01, 0x10, 0x04, 0x01, 0x04,
	0xc8, 14,	0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00,
			0x07, 0x00, 0x01, 0x07, 0x04, 0x01,
	0xd8, 1,	0x01,
	0xdb, 2,	0x00, 0x01,
	0xde, 7,	0x00, 0x01, 0x04, 0x04, 0x00, 0x00, 0x00,
	0xe6, 4,	0x00, 0x00, 0x00, 0x01,
	0xeb, 1,	0x00,
	0xff, 1,	0x02,		/* page 2 */
	0x22, 1,	0x00,
	0xff, 1,	0x03,		/* page 3 */
	0x00, 255,			/* load the page 3 */
	0x11, 1,	0x01,
	0xff, 1,	0x02,		/* page 2 */
	0x13, 1,	0x00,
	0x22, 4,	0x1f, 0xa4, 0xf0, 0x96,
	0x27, 2,	0x14, 0x0c,
	0x2a, 5,	0xc8, 0x00, 0x18, 0x12, 0x22,
	0x64, 8,	0x00, 0x00, 0xf0, 0x01, 0x14, 0x44, 0x44, 0x44,
	0x6e, 1,	0x08,
	0xff, 1,	0x03,		/* page 1 */
	0x78, 1,	0x00,
	0, 0				/* end of sequence */
};

/* page 3 - the value 0xaa says skip the index - see reg_w_page() */
static const __u8 page3_7302[] = {
	0x90, 0x40, 0x03, 0x50, 0xc2, 0x01, 0x14, 0x16,
	0x14, 0x12, 0x00, 0x00, 0x00, 0x02, 0x33, 0x00,
	0x0f, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x47, 0x01, 0xb3, 0x01, 0x00,
	0x00, 0x08, 0x00, 0x00, 0x0d, 0x00, 0x00, 0x21,
	0x00, 0x00, 0x00, 0x54, 0xf4, 0x02, 0x52, 0x54,
	0xa4, 0xb8, 0xe0, 0x2a, 0xf6, 0x00, 0x00, 0x00,
	0x00, 0x1e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0xfc, 0x00, 0xf2, 0x1f, 0x04, 0x00, 0x00,
	0x00, 0x00, 0x00, 0xc0, 0xc0, 0x10, 0x00, 0x00,
	0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x40, 0xff, 0x03, 0x19, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xc8, 0xc8, 0xc8,
	0xc8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50,
	0x08, 0x10, 0x24, 0x40, 0x00, 0x00, 0x00, 0x00,
	0x01, 0x00, 0x02, 0x47, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x02, 0xfa, 0x00, 0x64, 0x5a, 0x28, 0x00,
	0x00
};

/* pac 7311 */
static const __u8 probe_7311[] = {
	0x78, 0x40,	/* Bit_0=start stream, Bit_7=LED */
	0x78, 0x40,	/* Bit_0=start stream, Bit_7=LED */
	0x78, 0x44,	/* Bit_0=start stream, Bit_7=LED */
	0xff, 0x04,
	0x27, 0x80,
	0x28, 0xca,
	0x29, 0x53,
	0x2a, 0x0e,
	0xff, 0x01,
	0x3e, 0x20,
};

static const __u8 start_7311[] = {
/*	index, len, [value]* */
	0xff, 1,	0x01,		/* page 1 */
	0x02, 43,	0x48, 0x0a, 0x40, 0x08, 0x00, 0x00, 0x08, 0x00,
			0x06, 0xff, 0x11, 0xff, 0x5a, 0x30, 0x90, 0x4c,
			0x00, 0x07, 0x00, 0x0a, 0x10, 0x00, 0xa0, 0x10,
			0x02, 0x00, 0x00, 0x00, 0x00, 0x0b, 0x01, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00,
	0x3e, 42,	0x00, 0x00, 0x78, 0x52, 0x4a, 0x52, 0x78, 0x6e,
			0x48, 0x46, 0x48, 0x6e, 0x5f, 0x49, 0x42, 0x49,
			0x5f, 0x5f, 0x49, 0x42, 0x49, 0x5f, 0x6e, 0x48,
			0x46, 0x48, 0x6e, 0x78, 0x52, 0x4a, 0x52, 0x78,
			0x00, 0x00, 0x09, 0x1b, 0x34, 0x49, 0x5c, 0x9b,
			0xd0, 0xff,
	0x78, 6,	0x44, 0x00, 0xf2, 0x01, 0x01, 0x80,
	0x7f, 18,	0x2a, 0x1c, 0x00, 0xc8, 0x02, 0x58, 0x03, 0x84,
			0x12, 0x00, 0x1a, 0x04, 0x08, 0x0c, 0x10, 0x14,
			0x18, 0x20,
	0x96, 3,	0x01, 0x08, 0x04,
	0xa0, 4,	0x44, 0x44, 0x44, 0x04,
	0xf0, 13,	0x01, 0x00, 0x00, 0x00, 0x22, 0x00, 0x20, 0x00,
			0x3f, 0x00, 0x0a, 0x01, 0x00,
	0xff, 1,	0x04,		/* page 4 */
	0x00, 254,			/* load the page 4 */
	0x11, 1,	0x01,
	0, 0				/* end of sequence */
};

/* page 4 - the value 0xaa says skip the index - see reg_w_page() */
static const __u8 page4_7311[] = {
	0xaa, 0xaa, 0x04, 0x54, 0x07, 0x2b, 0x09, 0x0f,
	0x09, 0x00, 0xaa, 0xaa, 0x07, 0x00, 0x00, 0x62,
	0x08, 0xaa, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x03, 0xa0, 0x01, 0xf4, 0xaa,
	0xaa, 0x00, 0x08, 0xaa, 0x03, 0xaa, 0x00, 0x01,
	0xca, 0x10, 0x06, 0x78, 0x00, 0x00, 0x00, 0x00,
	0x23, 0x28, 0x04, 0x11, 0x00, 0x00
};

static void reg_w_buf(struct gspca_dev *gspca_dev,
		  __u8 index,
		  const char *buffer, int len)
{
	memcpy(gspca_dev->usb_buf, buffer, len);
	usb_control_msg(gspca_dev->dev,
			usb_sndctrlpipe(gspca_dev->dev, 0),
			1,		/* request */
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0,		/* value */
			index, gspca_dev->usb_buf, len,
			500);
}

static __u8 reg_r(struct gspca_dev *gspca_dev,
			     __u8 index)
{
	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, 1,
			500);
	return gspca_dev->usb_buf[0];
}

static void reg_w(struct gspca_dev *gspca_dev,
		  __u8 index,
		  __u8 value)
{
	gspca_dev->usb_buf[0] = value;
	usb_control_msg(gspca_dev->dev,
			usb_sndctrlpipe(gspca_dev->dev, 0),
			0,			/* request */
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			value, index, gspca_dev->usb_buf, 1,
			500);
}

static void reg_w_seq(struct gspca_dev *gspca_dev,
		const __u8 *seq, int len)
{
	while (--len >= 0) {
		reg_w(gspca_dev, seq[0], seq[1]);
		seq += 2;
	}
}

/* load the beginning of a page */
static void reg_w_page(struct gspca_dev *gspca_dev,
			const __u8 *page, int len)
{
	int index;

	for (index = 0; index < len; index++) {
		if (page[index] == 0xaa)		/* skip this index */
			continue;
		gspca_dev->usb_buf[0] = page[index];
		usb_control_msg(gspca_dev->dev,
				usb_sndctrlpipe(gspca_dev->dev, 0),
				0,			/* request */
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				0, index, gspca_dev->usb_buf, 1,
				500);
	}
}

/* output a variable sequence */
static void reg_w_var(struct gspca_dev *gspca_dev,
			const __u8 *seq)
{
	int index, len;

	for (;;) {
		index = *seq++;
		len = *seq++;
		switch (len) {
		case 0:
			return;
		case 254:
			reg_w_page(gspca_dev, page4_7311, sizeof page4_7311);
			break;
		case 255:
			reg_w_page(gspca_dev, page3_7302, sizeof page3_7302);
			break;
		default:
			if (len > 32) {
				PDEBUG(D_ERR|D_STREAM,
					"Incorrect variable sequence");
				return;
			}
			while (len > 0) {
				if (len < 8) {
					reg_w_buf(gspca_dev, index, seq, len);
					seq += len;
					break;
				}
				reg_w_buf(gspca_dev, index, seq, 8);
				seq += 8;
				index += 8;
				len -= 8;
			}
		}
	}
	/* not reached */
}

/* 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;

	cam = &gspca_dev->cam;
	cam->epaddr = 0x05;

	sd->sensor = id->driver_info;
	if (sd->sensor == SENSOR_PAC7302) {
		PDEBUG(D_CONF, "Find Sensor PAC7302");
		reg_w_seq(gspca_dev, probe_7302, sizeof probe_7302);

		cam->cam_mode = &vga_mode[2];	/* only 640x480 */
		cam->nmodes = 1;
	} else {
		PDEBUG(D_CONF, "Find Sensor PAC7311");
		reg_w_seq(gspca_dev, probe_7302, sizeof probe_7302);

		cam->cam_mode = vga_mode;
		cam->nmodes = ARRAY_SIZE(vga_mode);
	}

	sd->brightness = BRIGHTNESS_DEF;
	sd->contrast = CONTRAST_DEF;
	sd->colors = COLOR_DEF;
	sd->autogain = AUTOGAIN_DEF;
	sd->ag_cnt = -1;
	return 0;
}

/* rev 12a only */
static void setbrightcont(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int i, v;
	static const __u8 max[10] =
		{0x29, 0x33, 0x42, 0x5a, 0x6e, 0x80, 0x9f, 0xbb,
		 0xd4, 0xec};
	static const __u8 delta[10] =
		{0x35, 0x33, 0x33, 0x2f, 0x2a, 0x25, 0x1e, 0x17,
		 0x11, 0x0b};

	reg_w(gspca_dev, 0xff, 0x00);	/* page 0 */
	for (i = 0; i < 10; i++) {
		v = max[i];
		v += (sd->brightness - BRIGHTNESS_MAX)
			* 150 / BRIGHTNESS_MAX;		/* 200 ? */
		v -= delta[i] * sd->contrast / CONTRAST_MAX;
		if (v < 0)
			v = 0;
		else if (v > 0xff)
			v = 0xff;
		reg_w(gspca_dev, 0xa2 + i, v);
	}
	reg_w(gspca_dev, 0xdc, 0x01);
}

static void setbrightness(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int brightness;

	if (sd->sensor == SENSOR_PAC7302) {
		setbrightcont(gspca_dev);
		return;
	}
/*jfm: inverted?*/
	brightness = BRIGHTNESS_MAX - sd->brightness;
	reg_w(gspca_dev, 0xff, 0x04);
	reg_w(gspca_dev, 0x0f, brightness);
	/* load registers to sensor (Bit 0, auto clear) */
	reg_w(gspca_dev, 0x11, 0x01);
	PDEBUG(D_CONF|D_STREAM, "brightness: %i", brightness);
}

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

	if (sd->sensor == SENSOR_PAC7302) {
		setbrightcont(gspca_dev);
		return;
	}
	reg_w(gspca_dev, 0xff, 0x01);
	reg_w(gspca_dev, 0x80, sd->contrast);
	/* load registers to sensor (Bit 0, auto clear) */
	reg_w(gspca_dev, 0x11, 0x01);
}

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

	if (sd->sensor == SENSOR_PAC7302)
		return;
	reg_w(gspca_dev, 0xff, 0x01);
	reg_w(gspca_dev, 0x10, sd->colors);
	/* load registers to sensor (Bit 0, auto clear) */
	reg_w(gspca_dev, 0x11, 0x01);
	PDEBUG(D_CONF|D_STREAM, "color: %i", sd->colors);
}

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

	if (sd->autogain) {
		sd->lum_sum = 0;
		sd->ag_cnt = AG_CNT_START;
	} else {
		sd->ag_cnt = -1;
	}
}

/* this function is called at open time */
static int sd_open(struct gspca_dev *gspca_dev)
{
	reg_w(gspca_dev, 0x78, 0x00);	/* Turn on LED */
	return 0;
}

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

	sd->tosof = 0;

	if (sd->sensor == SENSOR_PAC7302)
		reg_w_var(gspca_dev, start_7302);
	else
		reg_w_var(gspca_dev, start_7311);

	setcontrast(gspca_dev);
	setbrightness(gspca_dev);
	setcolors(gspca_dev);
	setautogain(gspca_dev);

	/* set correct resolution */
	switch (gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv) {
	case 2:					/* 160x120 pac7311 */
		reg_w(gspca_dev, 0xff, 0x04);
		reg_w(gspca_dev, 0x02, 0x03);
		reg_w(gspca_dev, 0xff, 0x01);
		reg_w(gspca_dev, 0x08, 0x09);
		reg_w(gspca_dev, 0x17, 0x20);
		reg_w(gspca_dev, 0x1b, 0x00);
/*		reg_w(gspca_dev, 0x80, 0x69); */
		reg_w(gspca_dev, 0x87, 0x10);
		break;
	case 1:					/* 320x240 pac7311 */
		reg_w(gspca_dev, 0xff, 0x04);
		reg_w(gspca_dev, 0x02, 0x03);
		reg_w(gspca_dev, 0xff, 0x01);
		reg_w(gspca_dev, 0x08, 0x09);
		reg_w(gspca_dev, 0x17, 0x30);
/*		reg_w(gspca_dev, 0x80, 0x3f); */
		reg_w(gspca_dev, 0x87, 0x11);
		break;
	case 0:					/* 640x480 */
		if (sd->sensor == SENSOR_PAC7302)
			break;
		reg_w(gspca_dev, 0xff, 0x04);
		reg_w(gspca_dev, 0x02, 0x03);
		reg_w(gspca_dev, 0xff, 0x01);
		reg_w(gspca_dev, 0x08, 0x08);
		reg_w(gspca_dev, 0x17, 0x00);
/*		reg_w(gspca_dev, 0x80, 0x1c); */
		reg_w(gspca_dev, 0x87, 0x12);
		break;
	}

	/* start stream */
	reg_w(gspca_dev, 0xff, 0x01);
	if (sd->sensor == SENSOR_PAC7302) {
		reg_w(gspca_dev, 0x78, 0x01);
		reg_w(gspca_dev, 0xff, 0x01);
		reg_w(gspca_dev, 0x78, 0x01);
	} else {
		reg_w(gspca_dev, 0x78, 0x04);
		reg_w(gspca_dev, 0x78, 0x05);
	}
}

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

	if (sd->sensor == SENSOR_PAC7302) {
		reg_w(gspca_dev, 0x78, 0x00);
		reg_w(gspca_dev, 0x78, 0x00);
		return;
	}
	reg_w(gspca_dev, 0xff, 0x04);
	reg_w(gspca_dev, 0x27, 0x80);
	reg_w(gspca_dev, 0x28, 0xca);
	reg_w(gspca_dev, 0x29, 0x53);
	reg_w(gspca_dev, 0x2a, 0x0e);
	reg_w(gspca_dev, 0xff, 0x01);
	reg_w(gspca_dev, 0x3e, 0x20);
	reg_w(gspca_dev, 0x78, 0x04); /* Bit_0=start stream, Bit_7=LED */
	reg_w(gspca_dev, 0x78, 0x44); /* Bit_0=start stream, Bit_7=LED */
	reg_w(gspca_dev, 0x78, 0x44); /* Bit_0=start stream, Bit_7=LED */
}

static void sd_stop0(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	if (sd->sensor == SENSOR_PAC7302) {
		reg_w(gspca_dev, 0xff, 0x01);
		reg_w(gspca_dev, 0x78, 0x40);
	}
}

/* this function is called at close time */
static void sd_close(struct gspca_dev *gspca_dev)
{
}

static void do_autogain(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int luma;
	int luma_mean = 128;
	int luma_delta = 20;
	__u8 spring = 5;
	int Gbright;

	if (!atomic_read(&sd->do_gain))
		return;
	atomic_set(&sd->do_gain, 0);

	luma = atomic_read(&sd->avg_lum);
	Gbright = reg_r(gspca_dev, 0x02);
	PDEBUG(D_FRAM, "luma mean %d", luma);
	if (luma < luma_mean - luma_delta ||
	    luma > luma_mean + luma_delta) {
		Gbright += (luma_mean - luma) >> spring;
		if (Gbright > 0x1a)
			Gbright = 0x1a;
		else if (Gbright < 4)
			Gbright = 4;
		PDEBUG(D_FRAM, "gbright %d", Gbright);
		if (sd->sensor == SENSOR_PAC7302) {
			reg_w(gspca_dev, 0xff, 0x03);
			reg_w(gspca_dev, 0x10, Gbright);
			/* load registers to sensor (Bit 0, auto clear) */
			reg_w(gspca_dev, 0x11, 0x01);
		} else {
			reg_w(gspca_dev, 0xff, 0x04);
			reg_w(gspca_dev, 0x0f, Gbright);
			/* load registers to sensor (Bit 0, auto clear) */
			reg_w(gspca_dev, 0x11, 0x01);
		}
	}
}

/* this function is run at interrupt level */
static void sd_pkt_scan(struct gspca_dev *gspca_dev,
			struct gspca_frame *frame,	/* target */
			__u8 *data,			/* isoc packet */
			int len)			/* iso packet length */
{
	struct sd *sd = (struct sd *) gspca_dev;
	int i;

#define INTER_FRAME 0x53	/* eof + inter frame + sof */
#define LUM_OFFSET 0x1e		/* reverse offset / start of frame */

	/*
	 * inside a frame, there may be:
	 *	escaped ff ('ff 00')
	 *	sequences'ff ff ff xx' to remove
	 *	end of frame ('ff d9')
	 * at the end of frame, there are:
	 *	ff d9			end of frame
	 *	0x33 bytes
	 *	one byte luminosity
	 *	0x16 bytes
	 *	ff ff 00 ff 96 62 44	start of frame
	 */

	if (sd->tosof != 0) {	/* if outside a frame */

		/* get the luminosity and go to the start of frame */
		data += sd->tosof;
		len -= sd->tosof;
		if (sd->tosof > LUM_OFFSET)
			sd->lum_sum += data[-LUM_OFFSET];
		sd->tosof = 0;
		jpeg_put_header(gspca_dev, frame, 1, 0x21);
	}

	for (i = 0; i < len; i++) {
		if (data[i] != 0xff)
			continue;
		switch (data[i + 1]) {
		case 0xd9:		/* 'ff d9' end of frame */
			frame = gspca_frame_add(gspca_dev,
						LAST_PACKET,
						frame, data, i + 2);
			data += i + INTER_FRAME;
			len -= i + INTER_FRAME;
			i = 0;
			if (len > -LUM_OFFSET)
				sd->lum_sum += data[-LUM_OFFSET];
			if (len < 0) {
				sd->tosof = -len;
				break;
			}
			jpeg_put_header(gspca_dev, frame, 1, 0x21);
			break;
		}
	}
	gspca_frame_add(gspca_dev, INTER_PACKET,
			frame, data, i);
}

static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->brightness = val;
	if (gspca_dev->streaming)
		setbrightness(gspca_dev);
	return 0;
}

static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->brightness;
	return 0;
}

static int sd_setcontrast(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->contrast = val;
	if (gspca_dev->streaming)
		setcontrast(gspca_dev);
	return 0;
}

static int sd_getcontrast(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->contrast;
	return 0;
}

static int sd_setcolors(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->colors = val;
	if (gspca_dev->streaming)
		setcolors(gspca_dev);
	return 0;
}

static int sd_getcolors(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->colors;
	return 0;
}

static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->autogain = val;
	if (gspca_dev->streaming)
		setautogain(gspca_dev);
	return 0;
}

static int sd_getautogain(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->autogain;
	return 0;
}

/* sub-driver description */
static struct sd_desc sd_desc = {
	.name = MODULE_NAME,
	.ctrls = sd_ctrls,
	.nctrls = ARRAY_SIZE(sd_ctrls),
	.config = sd_config,
	.open = sd_open,
	.start = sd_start,
	.stopN = sd_stopN,
	.stop0 = sd_stop0,
	.close = sd_close,
	.pkt_scan = sd_pkt_scan,
	.dq_callback = do_autogain,
};

/* -- module initialisation -- */
static __devinitdata struct usb_device_id device_table[] = {
	{USB_DEVICE(0x093a, 0x2600), .driver_info = SENSOR_PAC7311},
	{USB_DEVICE(0x093a, 0x2601), .driver_info = SENSOR_PAC7311},
	{USB_DEVICE(0x093a, 0x2603), .driver_info = SENSOR_PAC7311},
	{USB_DEVICE(0x093a, 0x2608), .driver_info = SENSOR_PAC7311},
	{USB_DEVICE(0x093a, 0x260e), .driver_info = SENSOR_PAC7311},
	{USB_DEVICE(0x093a, 0x260f), .driver_info = SENSOR_PAC7311},
	{USB_DEVICE(0x093a, 0x2621), .driver_info = SENSOR_PAC7302},
	{}
};
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, sizeof(struct sd),
				THIS_MODULE);
}

static struct usb_driver sd_driver = {
	.name = MODULE_NAME,
	.id_table = device_table,
	.probe = sd_probe,
	.disconnect = gspca_disconnect,
};

/* -- module insert / remove -- */
static int __init sd_mod_init(void)
{
	if (usb_register(&sd_driver) < 0)
		return -1;
	PDEBUG(D_PROBE, "registered");
	return 0;
}
static void __exit sd_mod_exit(void)
{
	usb_deregister(&sd_driver);
	PDEBUG(D_PROBE, "deregistered");
}

module_init(sd_mod_init);
module_exit(sd_mod_exit);