linux/drivers/media/video/gspca/gl860/gl860.c - nest-guard/1.0/linux - Git at Google

 /* GSPCA subdrivers for Genesys Logic webcams with the GL860 chip
  * Subdriver core
  *
  * 2009/09/24 Olivier Lorin <o.lorin@laposte.net>
  * GSPCA by Jean-Francois Moine <http://moinejf.free.fr>
  * Thanks BUGabundo and Malmostoso for your amazing help!
  *
  * 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, see <http://www.gnu.org/licenses/>.
  */
 #include "gspca.h"
 #include "gl860.h"

 MODULE_AUTHOR("Olivier Lorin <o.lorin@laposte.net>");
 MODULE_DESCRIPTION("Genesys Logic USB PC Camera Driver");
 MODULE_LICENSE("GPL");

 /*======================== static function declarations ====================*/

 static void (*dev_init_settings)(struct gspca_dev *gspca_dev);

 static int  sd_config(struct gspca_dev *gspca_dev,
 			const struct usb_device_id *id);
 static int  sd_init(struct gspca_dev *gspca_dev);
 static int  sd_isoc_init(struct gspca_dev *gspca_dev);
 static int  sd_start(struct gspca_dev *gspca_dev);
 static void sd_stop0(struct gspca_dev *gspca_dev);
 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 			u8 *data, int len);
 static void sd_callback(struct gspca_dev *gspca_dev);

 static int gl860_guess_sensor(struct gspca_dev *gspca_dev,
 				u16 vendor_id, u16 product_id);

 /*============================ driver options ==============================*/

 static s32 AC50Hz = 0xff;
 module_param(AC50Hz, int, 0644);
 MODULE_PARM_DESC(AC50Hz, " Does AC power frequency is 50Hz? (0/1)");

 static char sensor[7];
 module_param_string(sensor, sensor, sizeof(sensor), 0644);
 MODULE_PARM_DESC(sensor,
 		" Driver sensor ('MI1320'/'MI2020'/'OV9655'/'OV2640')");

 /*============================ webcam controls =============================*/

 /* Functions to get and set a control value */
 #define SD_SETGET(thename) \
 static int sd_set_##thename(struct gspca_dev *gspca_dev, s32 val)\
 {\
 	struct sd *sd = (struct sd *) gspca_dev;\
 \
 	sd->vcur.thename = val;\
 	if (gspca_dev->streaming)\
 		sd->waitSet = 1;\
 	return 0;\
 } \
 static int sd_get_##thename(struct gspca_dev *gspca_dev, s32 *val)\
 {\
 	struct sd *sd = (struct sd *) gspca_dev;\
 \
 	*val = sd->vcur.thename;\
 	return 0;\
 }

 SD_SETGET(mirror)
 SD_SETGET(flip)
 SD_SETGET(AC50Hz)
 SD_SETGET(backlight)
 SD_SETGET(brightness)
 SD_SETGET(gamma)
 SD_SETGET(hue)
 SD_SETGET(saturation)
 SD_SETGET(sharpness)
 SD_SETGET(whitebal)
 SD_SETGET(contrast)

 #define GL860_NCTRLS 11

 /* control table */
 static struct ctrl sd_ctrls_mi1320[GL860_NCTRLS];
 static struct ctrl sd_ctrls_mi2020[GL860_NCTRLS];
 static struct ctrl sd_ctrls_ov2640[GL860_NCTRLS];
 static struct ctrl sd_ctrls_ov9655[GL860_NCTRLS];

 #define SET_MY_CTRL(theid, \
 	thetype, thelabel, thename) \
 	if (sd->vmax.thename != 0) {\
 		sd_ctrls[nCtrls].qctrl.id   = theid;\
 		sd_ctrls[nCtrls].qctrl.type = thetype;\
 		strcpy(sd_ctrls[nCtrls].qctrl.name, thelabel);\
 		sd_ctrls[nCtrls].qctrl.minimum = 0;\
 		sd_ctrls[nCtrls].qctrl.maximum = sd->vmax.thename;\
 		sd_ctrls[nCtrls].qctrl.default_value = sd->vcur.thename;\
 		sd_ctrls[nCtrls].qctrl.step = \
 			(sd->vmax.thename < 16) ? 1 : sd->vmax.thename/16;\
 		sd_ctrls[nCtrls].set = sd_set_##thename;\
 		sd_ctrls[nCtrls].get = sd_get_##thename;\
 		nCtrls++;\
 	}

 static int gl860_build_control_table(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	struct ctrl *sd_ctrls;
 	int nCtrls = 0;

 	if (_MI1320_)
 		sd_ctrls = sd_ctrls_mi1320;
 	else if (_MI2020_)
 		sd_ctrls = sd_ctrls_mi2020;
 	else if (_OV2640_)
 		sd_ctrls = sd_ctrls_ov2640;
 	else if (_OV9655_)
 		sd_ctrls = sd_ctrls_ov9655;
 	else
 		return 0;

 	memset(sd_ctrls, 0, GL860_NCTRLS * sizeof(struct ctrl));

 	SET_MY_CTRL(V4L2_CID_BRIGHTNESS,
 		V4L2_CTRL_TYPE_INTEGER, "Brightness", brightness)
 	SET_MY_CTRL(V4L2_CID_SHARPNESS,
 		V4L2_CTRL_TYPE_INTEGER, "Sharpness", sharpness)
 	SET_MY_CTRL(V4L2_CID_CONTRAST,
 		V4L2_CTRL_TYPE_INTEGER, "Contrast", contrast)
 	SET_MY_CTRL(V4L2_CID_GAMMA,
 		V4L2_CTRL_TYPE_INTEGER, "Gamma", gamma)
 	SET_MY_CTRL(V4L2_CID_HUE,
 		V4L2_CTRL_TYPE_INTEGER, "Palette", hue)
 	SET_MY_CTRL(V4L2_CID_SATURATION,
 		V4L2_CTRL_TYPE_INTEGER, "Saturation", saturation)
 	SET_MY_CTRL(V4L2_CID_WHITE_BALANCE_TEMPERATURE,
 		V4L2_CTRL_TYPE_INTEGER, "White Bal.", whitebal)
 	SET_MY_CTRL(V4L2_CID_BACKLIGHT_COMPENSATION,
 		V4L2_CTRL_TYPE_INTEGER, "Backlight" , backlight)

 	SET_MY_CTRL(V4L2_CID_HFLIP,
 		V4L2_CTRL_TYPE_BOOLEAN, "Mirror", mirror)
 	SET_MY_CTRL(V4L2_CID_VFLIP,
 		V4L2_CTRL_TYPE_BOOLEAN, "Flip", flip)
 	SET_MY_CTRL(V4L2_CID_POWER_LINE_FREQUENCY,
 		V4L2_CTRL_TYPE_BOOLEAN, "AC power 50Hz", AC50Hz)

 	return nCtrls;
 }

 /*==================== sud-driver structure initialisation =================*/

 static const struct sd_desc sd_desc_mi1320 = {
 	.name        = MODULE_NAME,
 	.ctrls       = sd_ctrls_mi1320,
 	.nctrls      = GL860_NCTRLS,
 	.config      = sd_config,
 	.init        = sd_init,
 	.isoc_init   = sd_isoc_init,
 	.start       = sd_start,
 	.stop0       = sd_stop0,
 	.pkt_scan    = sd_pkt_scan,
 	.dq_callback = sd_callback,
 };

 static const struct sd_desc sd_desc_mi2020 = {
 	.name        = MODULE_NAME,
 	.ctrls       = sd_ctrls_mi2020,
 	.nctrls      = GL860_NCTRLS,
 	.config      = sd_config,
 	.init        = sd_init,
 	.isoc_init   = sd_isoc_init,
 	.start       = sd_start,
 	.stop0       = sd_stop0,
 	.pkt_scan    = sd_pkt_scan,
 	.dq_callback = sd_callback,
 };

 static const struct sd_desc sd_desc_ov2640 = {
 	.name        = MODULE_NAME,
 	.ctrls       = sd_ctrls_ov2640,
 	.nctrls      = GL860_NCTRLS,
 	.config      = sd_config,
 	.init        = sd_init,
 	.isoc_init   = sd_isoc_init,
 	.start       = sd_start,
 	.stop0       = sd_stop0,
 	.pkt_scan    = sd_pkt_scan,
 	.dq_callback = sd_callback,
 };

 static const struct sd_desc sd_desc_ov9655 = {
 	.name        = MODULE_NAME,
 	.ctrls       = sd_ctrls_ov9655,
 	.nctrls      = GL860_NCTRLS,
 	.config      = sd_config,
 	.init        = sd_init,
 	.isoc_init   = sd_isoc_init,
 	.start       = sd_start,
 	.stop0       = sd_stop0,
 	.pkt_scan    = sd_pkt_scan,
 	.dq_callback = sd_callback,
 };

 /*=========================== sub-driver image sizes =======================*/

 static struct v4l2_pix_format mi2020_mode[] = {
 	{ 640,  480, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 640,
 		.sizeimage = 640 * 480,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0
 	},
 	{ 800,  598, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 800,
 		.sizeimage = 800 * 598,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 1
 	},
 	{1280, 1024, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 1280,
 		.sizeimage = 1280 * 1024,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 2
 	},
 	{1600, 1198, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 1600,
 		.sizeimage = 1600 * 1198,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 3
 	},
 };

 static struct v4l2_pix_format ov2640_mode[] = {
 	{ 640,  480, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 640,
 		.sizeimage = 640 * 480,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0
 	},
 	{ 800,  600, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 800,
 		.sizeimage = 800 * 600,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 1
 	},
 	{1280,  960, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 1280,
 		.sizeimage = 1280 * 960,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 2
 	},
 	{1600, 1200, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 1600,
 		.sizeimage = 1600 * 1200,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 3
 	},
 };

 static struct v4l2_pix_format mi1320_mode[] = {
 	{ 640,  480, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 640,
 		.sizeimage = 640 * 480,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0
 	},
 	{ 800,  600, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 800,
 		.sizeimage = 800 * 600,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 1
 	},
 	{1280,  960, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 1280,
 		.sizeimage = 1280 * 960,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 2
 	},
 };

 static struct v4l2_pix_format ov9655_mode[] = {
 	{ 640,  480, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 640,
 		.sizeimage = 640 * 480,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 0
 	},
 	{1280,  960, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
 		.bytesperline = 1280,
 		.sizeimage = 1280 * 960,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.priv = 1
 	},
 };

 /*========================= sud-driver functions ===========================*/

 /* 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_id, product_id;

 	/* Get USB VendorID and ProductID */
 	vendor_id  = id->idVendor;
 	product_id = id->idProduct;

 	sd->nbRightUp = 1;
 	sd->nbIm = -1;

 	sd->sensor = 0xff;
 	if (strcmp(sensor, "MI1320") == 0)
 		sd->sensor = ID_MI1320;
 	else if (strcmp(sensor, "OV2640") == 0)
 		sd->sensor = ID_OV2640;
 	else if (strcmp(sensor, "OV9655") == 0)
 		sd->sensor = ID_OV9655;
 	else if (strcmp(sensor, "MI2020") == 0)
 		sd->sensor = ID_MI2020;

 	/* Get sensor and set the suitable init/start/../stop functions */
 	if (gl860_guess_sensor(gspca_dev, vendor_id, product_id) == -1)
 		return -1;

 	cam = &gspca_dev->cam;
 	gspca_dev->nbalt = 4;

 	switch (sd->sensor) {
 	case ID_MI1320:
 		gspca_dev->sd_desc = &sd_desc_mi1320;
 		cam->cam_mode = mi1320_mode;
 		cam->nmodes = ARRAY_SIZE(mi1320_mode);
 		dev_init_settings   = mi1320_init_settings;
 		break;

 	case ID_MI2020:
 		gspca_dev->sd_desc = &sd_desc_mi2020;
 		cam->cam_mode = mi2020_mode;
 		cam->nmodes = ARRAY_SIZE(mi2020_mode);
 		dev_init_settings   = mi2020_init_settings;
 		break;

 	case ID_OV2640:
 		gspca_dev->sd_desc = &sd_desc_ov2640;
 		cam->cam_mode = ov2640_mode;
 		cam->nmodes = ARRAY_SIZE(ov2640_mode);
 		dev_init_settings   = ov2640_init_settings;
 		break;

 	case ID_OV9655:
 		gspca_dev->sd_desc = &sd_desc_ov9655;
 		cam->cam_mode = ov9655_mode;
 		cam->nmodes = ARRAY_SIZE(ov9655_mode);
 		dev_init_settings   = ov9655_init_settings;
 		break;
 	}

 	dev_init_settings(gspca_dev);
 	if (AC50Hz != 0xff)
 		((struct sd *) gspca_dev)->vcur.AC50Hz = AC50Hz;
 	gl860_build_control_table(gspca_dev);

 	return 0;
 }

 /* This function is called at probe time after sd_config */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;

 	return sd->dev_init_at_startup(gspca_dev);
 }

 /* This function is called before to choose the alt setting */
 static int sd_isoc_init(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;

 	return sd->dev_configure_alt(gspca_dev);
 }

 /* This function is called to start the webcam */
 static int sd_start(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;

 	return sd->dev_init_pre_alt(gspca_dev);
 }

 /* This function is called to stop the webcam */
 static void sd_stop0(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;

 	return sd->dev_post_unset_alt(gspca_dev);
 }

 /* This function is called when an image is being received */
 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 			u8 *data, int len)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	static s32 nSkipped;

 	s32 mode = (s32) gspca_dev->curr_mode;
 	s32 nToSkip =
 		sd->swapRB * (gspca_dev->cam.cam_mode[mode].bytesperline + 1);

 	/* Test only against 0202h, so endianess does not matter */
 	switch (*(s16 *) data) {
 	case 0x0202:		/* End of frame, start a new one */
 		gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
 		nSkipped = 0;
 		if (sd->nbIm >= 0 && sd->nbIm < 10)
 			sd->nbIm++;
 		gspca_frame_add(gspca_dev, FIRST_PACKET, NULL, 0);
 		break;

 	default:
 		data += 2;
 		len  -= 2;
 		if (nSkipped + len <= nToSkip)
 			nSkipped += len;
 		else {
 			if (nSkipped < nToSkip && nSkipped + len > nToSkip) {
 				data += nToSkip - nSkipped;
 				len  -= nToSkip - nSkipped;
 				nSkipped = nToSkip + 1;
 			}
 			gspca_frame_add(gspca_dev,
 				INTER_PACKET, data, len);
 		}
 		break;
 	}
 }

 /* This function is called when an image has been read */
 /* This function is used to monitor webcam orientation */
 static void sd_callback(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;

 	if (!_OV9655_) {
 		u8 state;
 		u8 upsideDown;

 		/* Probe sensor orientation */
 		ctrl_in(gspca_dev, 0xc0, 2, 0x0000, 0x0000, 1, (void *)&state);

 		/* C8/40 means upside-down (looking backwards) */
 		/* D8/50 means right-up (looking onwards) */
 		upsideDown = (state == 0xc8 || state == 0x40);

 		if (upsideDown && sd->nbRightUp > -4) {
 			if (sd->nbRightUp > 0)
 				sd->nbRightUp = 0;
 			if (sd->nbRightUp == -3) {
 				sd->mirrorMask = 1;
 				sd->waitSet = 1;
 			}
 			sd->nbRightUp--;
 		}
 		if (!upsideDown && sd->nbRightUp < 4) {
 			if (sd->nbRightUp  < 0)
 				sd->nbRightUp = 0;
 			if (sd->nbRightUp == 3) {
 				sd->mirrorMask = 0;
 				sd->waitSet = 1;
 			}
 			sd->nbRightUp++;
 		}
 	}

 	if (sd->waitSet)
 		sd->dev_camera_settings(gspca_dev);
 }

 /*=================== USB driver structure initialisation ==================*/

 static const __devinitdata struct usb_device_id device_table[] = {
 	{USB_DEVICE(0x05e3, 0x0503)},
 	{USB_DEVICE(0x05e3, 0xf191)},
 	{}
 };

 MODULE_DEVICE_TABLE(usb, device_table);

 static int sd_probe(struct usb_interface *intf,
 				const struct usb_device_id *id)
 {
 	struct gspca_dev *gspca_dev;
 	s32 ret;

 	ret = gspca_dev_probe(intf, id,
 			&sd_desc_mi1320, sizeof(struct sd), THIS_MODULE);

 	if (ret >= 0) {
 		gspca_dev = usb_get_intfdata(intf);

 		PDEBUG(D_PROBE,
 			"Camera is now controlling video device %s",
 			video_device_node_name(&gspca_dev->vdev));
 	}

 	return ret;
 }

 static void sd_disconnect(struct usb_interface *intf)
 {
 	gspca_disconnect(intf);
 }

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

 /*====================== Init and Exit module functions ====================*/

 static int __init sd_mod_init(void)
 {
 	PDEBUG(D_PROBE, "driver startup - version %s", DRIVER_VERSION);

 	if (usb_register(&sd_driver) < 0)
 		return -1;
 	return 0;
 }

 static void __exit sd_mod_exit(void)
 {
 	usb_deregister(&sd_driver);
 }

 module_init(sd_mod_init);
 module_exit(sd_mod_exit);

 /*==========================================================================*/

 int gl860_RTx(struct gspca_dev *gspca_dev,
 		unsigned char pref, u32 req, u16 val, u16 index,
 		s32 len, void *pdata)
 {
 	struct usb_device *udev = gspca_dev->dev;
 	s32 r = 0;

 	if (pref == 0x40) { /* Send */
 		if (len > 0) {
 			memcpy(gspca_dev->usb_buf, pdata, len);
 			r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 					req, pref, val, index,
 					gspca_dev->usb_buf,
 					len, 400 + 200 * (len > 1));
 		} else {
 			r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 					req, pref, val, index, NULL, len, 400);
 		}
 	} else { /* Receive */
 		if (len > 0) {
 			r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 					req, pref, val, index,
 					gspca_dev->usb_buf,
 					len, 400 + 200 * (len > 1));
 			memcpy(pdata, gspca_dev->usb_buf, len);
 		} else {
 			r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 					req, pref, val, index, NULL, len, 400);
 		}
 	}

 	if (r < 0)
 		err("ctrl transfer failed %4d "
 			"[p%02x r%d v%04x i%04x len%d]",
 			r, pref, req, val, index, len);
 	else if (len > 1 && r < len)
 		PDEBUG(D_ERR, "short ctrl transfer %d/%d", r, len);

 	msleep(1);

 	return r;
 }

 int fetch_validx(struct gspca_dev *gspca_dev, struct validx *tbl, int len)
 {
 	int n;

 	for (n = 0; n < len; n++) {
 		if (tbl[n].idx != 0xffff)
 			ctrl_out(gspca_dev, 0x40, 1, tbl[n].val,
 					tbl[n].idx, 0, NULL);
 		else if (tbl[n].val == 0xffff)
 			break;
 		else
 			msleep(tbl[n].val);
 	}
 	return n;
 }

 int keep_on_fetching_validx(struct gspca_dev *gspca_dev, struct validx *tbl,
 				int len, int n)
 {
 	while (++n < len) {
 		if (tbl[n].idx != 0xffff)
 			ctrl_out(gspca_dev, 0x40, 1, tbl[n].val, tbl[n].idx,
 					0, NULL);
 		else if (tbl[n].val == 0xffff)
 			break;
 		else
 			msleep(tbl[n].val);
 	}
 	return n;
 }

 void fetch_idxdata(struct gspca_dev *gspca_dev, struct idxdata *tbl, int len)
 {
 	int n;

 	for (n = 0; n < len; n++) {
 		if (memcmp(tbl[n].data, "\xff\xff\xff", 3) != 0)
 			ctrl_out(gspca_dev, 0x40, 3, 0x7a00, tbl[n].idx,
 					3, tbl[n].data);
 		else
 			msleep(tbl[n].idx);
 	}
 }

 static int gl860_guess_sensor(struct gspca_dev *gspca_dev,
 				u16 vendor_id, u16 product_id)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 probe, nb26, nb96, nOV, ntry;

 	if (product_id == 0xf191)
 		sd->sensor = ID_MI1320;

 	if (sd->sensor == 0xff) {
 		ctrl_in(gspca_dev, 0xc0, 2, 0x0000, 0x0004, 1, &probe);
 		ctrl_in(gspca_dev, 0xc0, 2, 0x0000, 0x0004, 1, &probe);

 		ctrl_out(gspca_dev, 0x40, 1, 0x0000, 0x0000, 0, NULL);
 		msleep(3);
 		ctrl_out(gspca_dev, 0x40, 1, 0x0010, 0x0010, 0, NULL);
 		msleep(3);
 		ctrl_out(gspca_dev, 0x40, 1, 0x0008, 0x00c0, 0, NULL);
 		msleep(3);
 		ctrl_out(gspca_dev, 0x40, 1, 0x0001, 0x00c1, 0, NULL);
 		msleep(3);
 		ctrl_out(gspca_dev, 0x40, 1, 0x0001, 0x00c2, 0, NULL);
 		msleep(3);
 		ctrl_out(gspca_dev, 0x40, 1, 0x0020, 0x0006, 0, NULL);
 		msleep(3);
 		ctrl_out(gspca_dev, 0x40, 1, 0x006a, 0x000d, 0, NULL);
 		msleep(56);

 		PDEBUG(D_PROBE, "probing for sensor MI2020 or OVXXXX");
 		nOV = 0;
 		for (ntry = 0; ntry < 4; ntry++) {
 			ctrl_out(gspca_dev, 0x40, 1, 0x0040, 0x0000, 0, NULL);
 			msleep(3);
 			ctrl_out(gspca_dev, 0x40, 1, 0x0063, 0x0006, 0, NULL);
 			msleep(3);
 			ctrl_out(gspca_dev, 0x40, 1, 0x7a00, 0x8030, 0, NULL);
 			msleep(10);
 			ctrl_in(gspca_dev, 0xc0, 2, 0x7a00, 0x8030, 1, &probe);
 			PDEBUG(D_PROBE, "probe=0x%02x", probe);
 			if (probe == 0xff)
 				nOV++;
 		}

 		if (nOV) {
 			PDEBUG(D_PROBE, "0xff -> OVXXXX");
 			PDEBUG(D_PROBE, "probing for sensor OV2640 or OV9655");

 			nb26 = nb96 = 0;
 			for (ntry = 0; ntry < 4; ntry++) {
 				ctrl_out(gspca_dev, 0x40, 1, 0x0040, 0x0000,
 						0, NULL);
 				msleep(3);
 				ctrl_out(gspca_dev, 0x40, 1, 0x6000, 0x800a,
 						0, NULL);
 				msleep(10);

 				/* Wait for 26(OV2640) or 96(OV9655) */
 				ctrl_in(gspca_dev, 0xc0, 2, 0x6000, 0x800a,
 						1, &probe);

 				if (probe == 0x26 || probe == 0x40) {
 					PDEBUG(D_PROBE,
 						"probe=0x%02x -> OV2640",
 						probe);
 					sd->sensor = ID_OV2640;
 					nb26 += 4;
 					break;
 				}
 				if (probe == 0x96 || probe == 0x55) {
 					PDEBUG(D_PROBE,
 						"probe=0x%02x -> OV9655",
 						probe);
 					sd->sensor = ID_OV9655;
 					nb96 += 4;
 					break;
 				}
 				PDEBUG(D_PROBE, "probe=0x%02x", probe);
 				if (probe == 0x00)
 					nb26++;
 				if (probe == 0xff)
 					nb96++;
 				msleep(3);
 			}
 			if (nb26 < 4 && nb96 < 4)
 				return -1;
 		} else {
 			PDEBUG(D_PROBE, "Not any 0xff -> MI2020");
 			sd->sensor = ID_MI2020;
 		}
 	}

 	if (_MI1320_) {
 		PDEBUG(D_PROBE, "05e3:f191 sensor MI1320 (1.3M)");
 	} else if (_MI2020_) {
 		PDEBUG(D_PROBE, "05e3:0503 sensor MI2020 (2.0M)");
 	} else if (_OV9655_) {
 		PDEBUG(D_PROBE, "05e3:0503 sensor OV9655 (1.3M)");
 	} else if (_OV2640_) {
 		PDEBUG(D_PROBE, "05e3:0503 sensor OV2640 (2.0M)");
 	} else {
 		PDEBUG(D_PROBE, "***** Unknown sensor *****");
 		return -1;
 	}

 	return 0;
 }
	/* GSPCA subdrivers for Genesys Logic webcams with the GL860 chip
	* Subdriver core
	*
	* 2009/09/24 Olivier Lorin <o.lorin@laposte.net>
	* GSPCA by Jean-Francois Moine <http://moinejf.free.fr>
	* Thanks BUGabundo and Malmostoso for your amazing help!
	*
	* 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, see <http://www.gnu.org/licenses/>.
	*/
	#include "gspca.h"
	#include "gl860.h"

	MODULE_AUTHOR("Olivier Lorin <o.lorin@laposte.net>");
	MODULE_DESCRIPTION("Genesys Logic USB PC Camera Driver");
	MODULE_LICENSE("GPL");

	/======================== static function declarations ====================/

	static void (dev_init_settings)(struct gspca_dev gspca_dev);

	static int sd_config(struct gspca_dev *gspca_dev,
	const struct usb_device_id *id);
	static int sd_init(struct gspca_dev *gspca_dev);
	static int sd_isoc_init(struct gspca_dev *gspca_dev);
	static int sd_start(struct gspca_dev *gspca_dev);
	static void sd_stop0(struct gspca_dev *gspca_dev);
	static void sd_pkt_scan(struct gspca_dev *gspca_dev,
	u8 *data, int len);
	static void sd_callback(struct gspca_dev *gspca_dev);

	static int gl860_guess_sensor(struct gspca_dev *gspca_dev,
	u16 vendor_id, u16 product_id);

	/============================ driver options ==============================/

	static s32 AC50Hz = 0xff;
	module_param(AC50Hz, int, 0644);
	MODULE_PARM_DESC(AC50Hz, " Does AC power frequency is 50Hz? (0/1)");

	static char sensor[7];
	module_param_string(sensor, sensor, sizeof(sensor), 0644);
	MODULE_PARM_DESC(sensor,
	" Driver sensor ('MI1320'/'MI2020'/'OV9655'/'OV2640')");

	/============================ webcam controls =============================/

	/* Functions to get and set a control value */
	#define SD_SETGET(thename) \
	static int sd_set_##thename(struct gspca_dev *gspca_dev, s32 val)\
	{\
	struct sd sd = (struct sd ) gspca_dev;\
	\
	sd->vcur.thename = val;\
	if (gspca_dev->streaming)\
	sd->waitSet = 1;\
	return 0;\
	} \
	static int sd_get_##thename(struct gspca_dev gspca_dev, s32 val)\
	{\
	struct sd sd = (struct sd ) gspca_dev;\
	\
	*val = sd->vcur.thename;\
	return 0;\
	}

	SD_SETGET(mirror)
	SD_SETGET(flip)
	SD_SETGET(AC50Hz)
	SD_SETGET(backlight)
	SD_SETGET(brightness)
	SD_SETGET(gamma)
	SD_SETGET(hue)
	SD_SETGET(saturation)
	SD_SETGET(sharpness)
	SD_SETGET(whitebal)
	SD_SETGET(contrast)

	#define GL860_NCTRLS 11

	/* control table */
	static struct ctrl sd_ctrls_mi1320[GL860_NCTRLS];
	static struct ctrl sd_ctrls_mi2020[GL860_NCTRLS];
	static struct ctrl sd_ctrls_ov2640[GL860_NCTRLS];
	static struct ctrl sd_ctrls_ov9655[GL860_NCTRLS];

	#define SET_MY_CTRL(theid, \
	thetype, thelabel, thename) \
	if (sd->vmax.thename != 0) {\
	sd_ctrls[nCtrls].qctrl.id = theid;\
	sd_ctrls[nCtrls].qctrl.type = thetype;\
	strcpy(sd_ctrls[nCtrls].qctrl.name, thelabel);\
	sd_ctrls[nCtrls].qctrl.minimum = 0;\
	sd_ctrls[nCtrls].qctrl.maximum = sd->vmax.thename;\
	sd_ctrls[nCtrls].qctrl.default_value = sd->vcur.thename;\
	sd_ctrls[nCtrls].qctrl.step = \
	(sd->vmax.thename < 16) ? 1 : sd->vmax.thename/16;\
	sd_ctrls[nCtrls].set = sd_set_##thename;\
	sd_ctrls[nCtrls].get = sd_get_##thename;\
	nCtrls++;\
	}

	static int gl860_build_control_table(struct gspca_dev *gspca_dev)
	{
	struct sd sd = (struct sd ) gspca_dev;
	struct ctrl *sd_ctrls;
	int nCtrls = 0;

	if (_MI1320_)
	sd_ctrls = sd_ctrls_mi1320;
	else if (_MI2020_)
	sd_ctrls = sd_ctrls_mi2020;
	else if (_OV2640_)
	sd_ctrls = sd_ctrls_ov2640;
	else if (_OV9655_)
	sd_ctrls = sd_ctrls_ov9655;
	else
	return 0;

	memset(sd_ctrls, 0, GL860_NCTRLS * sizeof(struct ctrl));

	SET_MY_CTRL(V4L2_CID_BRIGHTNESS,
	V4L2_CTRL_TYPE_INTEGER, "Brightness", brightness)
	SET_MY_CTRL(V4L2_CID_SHARPNESS,
	V4L2_CTRL_TYPE_INTEGER, "Sharpness", sharpness)
	SET_MY_CTRL(V4L2_CID_CONTRAST,
	V4L2_CTRL_TYPE_INTEGER, "Contrast", contrast)
	SET_MY_CTRL(V4L2_CID_GAMMA,
	V4L2_CTRL_TYPE_INTEGER, "Gamma", gamma)
	SET_MY_CTRL(V4L2_CID_HUE,
	V4L2_CTRL_TYPE_INTEGER, "Palette", hue)
	SET_MY_CTRL(V4L2_CID_SATURATION,
	V4L2_CTRL_TYPE_INTEGER, "Saturation", saturation)
	SET_MY_CTRL(V4L2_CID_WHITE_BALANCE_TEMPERATURE,
	V4L2_CTRL_TYPE_INTEGER, "White Bal.", whitebal)
	SET_MY_CTRL(V4L2_CID_BACKLIGHT_COMPENSATION,
	V4L2_CTRL_TYPE_INTEGER, "Backlight" , backlight)

	SET_MY_CTRL(V4L2_CID_HFLIP,
	V4L2_CTRL_TYPE_BOOLEAN, "Mirror", mirror)
	SET_MY_CTRL(V4L2_CID_VFLIP,
	V4L2_CTRL_TYPE_BOOLEAN, "Flip", flip)
	SET_MY_CTRL(V4L2_CID_POWER_LINE_FREQUENCY,
	V4L2_CTRL_TYPE_BOOLEAN, "AC power 50Hz", AC50Hz)

	return nCtrls;
	}

	/==================== sud-driver structure initialisation =================/

	static const struct sd_desc sd_desc_mi1320 = {
	.name = MODULE_NAME,
	.ctrls = sd_ctrls_mi1320,
	.nctrls = GL860_NCTRLS,
	.config = sd_config,
	.init = sd_init,
	.isoc_init = sd_isoc_init,
	.start = sd_start,
	.stop0 = sd_stop0,
	.pkt_scan = sd_pkt_scan,
	.dq_callback = sd_callback,
	};

	static const struct sd_desc sd_desc_mi2020 = {
	.name = MODULE_NAME,
	.ctrls = sd_ctrls_mi2020,
	.nctrls = GL860_NCTRLS,
	.config = sd_config,
	.init = sd_init,
	.isoc_init = sd_isoc_init,
	.start = sd_start,
	.stop0 = sd_stop0,
	.pkt_scan = sd_pkt_scan,
	.dq_callback = sd_callback,
	};

	static const struct sd_desc sd_desc_ov2640 = {
	.name = MODULE_NAME,
	.ctrls = sd_ctrls_ov2640,
	.nctrls = GL860_NCTRLS,
	.config = sd_config,
	.init = sd_init,
	.isoc_init = sd_isoc_init,
	.start = sd_start,
	.stop0 = sd_stop0,
	.pkt_scan = sd_pkt_scan,
	.dq_callback = sd_callback,
	};

	static const struct sd_desc sd_desc_ov9655 = {
	.name = MODULE_NAME,
	.ctrls = sd_ctrls_ov9655,
	.nctrls = GL860_NCTRLS,
	.config = sd_config,
	.init = sd_init,
	.isoc_init = sd_isoc_init,
	.start = sd_start,
	.stop0 = sd_stop0,
	.pkt_scan = sd_pkt_scan,
	.dq_callback = sd_callback,
	};

	/=========================== sub-driver image sizes =======================/

	static struct v4l2_pix_format mi2020_mode[] = {
	{ 640, 480, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 640,
	.sizeimage = 640 * 480,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0
	},
	{ 800, 598, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 800,
	.sizeimage = 800 * 598,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 1
	},
	{1280, 1024, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 1280,
	.sizeimage = 1280 * 1024,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 2
	},
	{1600, 1198, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 1600,
	.sizeimage = 1600 * 1198,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 3
	},
	};

	static struct v4l2_pix_format ov2640_mode[] = {
	{ 640, 480, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 640,
	.sizeimage = 640 * 480,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0
	},
	{ 800, 600, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 800,
	.sizeimage = 800 * 600,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 1
	},
	{1280, 960, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 1280,
	.sizeimage = 1280 * 960,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 2
	},
	{1600, 1200, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 1600,
	.sizeimage = 1600 * 1200,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 3
	},
	};

	static struct v4l2_pix_format mi1320_mode[] = {
	{ 640, 480, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 640,
	.sizeimage = 640 * 480,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0
	},
	{ 800, 600, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 800,
	.sizeimage = 800 * 600,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 1
	},
	{1280, 960, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 1280,
	.sizeimage = 1280 * 960,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 2
	},
	};

	static struct v4l2_pix_format ov9655_mode[] = {
	{ 640, 480, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 640,
	.sizeimage = 640 * 480,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 0
	},
	{1280, 960, V4L2_PIX_FMT_SGBRG8, V4L2_FIELD_NONE,
	.bytesperline = 1280,
	.sizeimage = 1280 * 960,
	.colorspace = V4L2_COLORSPACE_SRGB,
	.priv = 1
	},
	};

	/========================= sud-driver functions ===========================/

	/* 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_id, product_id;

	/* Get USB VendorID and ProductID */
	vendor_id = id->idVendor;
	product_id = id->idProduct;

	sd->nbRightUp = 1;
	sd->nbIm = -1;

	sd->sensor = 0xff;
	if (strcmp(sensor, "MI1320") == 0)
	sd->sensor = ID_MI1320;
	else if (strcmp(sensor, "OV2640") == 0)
	sd->sensor = ID_OV2640;
	else if (strcmp(sensor, "OV9655") == 0)
	sd->sensor = ID_OV9655;
	else if (strcmp(sensor, "MI2020") == 0)
	sd->sensor = ID_MI2020;

	/* Get sensor and set the suitable init/start/../stop functions */
	if (gl860_guess_sensor(gspca_dev, vendor_id, product_id) == -1)
	return -1;

	cam = &gspca_dev->cam;
	gspca_dev->nbalt = 4;

	switch (sd->sensor) {
	case ID_MI1320:
	gspca_dev->sd_desc = &sd_desc_mi1320;
	cam->cam_mode = mi1320_mode;
	cam->nmodes = ARRAY_SIZE(mi1320_mode);
	dev_init_settings = mi1320_init_settings;
	break;

	case ID_MI2020:
	gspca_dev->sd_desc = &sd_desc_mi2020;
	cam->cam_mode = mi2020_mode;
	cam->nmodes = ARRAY_SIZE(mi2020_mode);
	dev_init_settings = mi2020_init_settings;
	break;

	case ID_OV2640:
	gspca_dev->sd_desc = &sd_desc_ov2640;
	cam->cam_mode = ov2640_mode;
	cam->nmodes = ARRAY_SIZE(ov2640_mode);
	dev_init_settings = ov2640_init_settings;
	break;

	case ID_OV9655:
	gspca_dev->sd_desc = &sd_desc_ov9655;
	cam->cam_mode = ov9655_mode;
	cam->nmodes = ARRAY_SIZE(ov9655_mode);
	dev_init_settings = ov9655_init_settings;
	break;
	}

	dev_init_settings(gspca_dev);
	if (AC50Hz != 0xff)
	((struct sd *) gspca_dev)->vcur.AC50Hz = AC50Hz;
	gl860_build_control_table(gspca_dev);

	return 0;
	}

	/* This function is called at probe time after sd_config */
	static int sd_init(struct gspca_dev *gspca_dev)
	{
	struct sd sd = (struct sd ) gspca_dev;

	return sd->dev_init_at_startup(gspca_dev);
	}

	/* This function is called before to choose the alt setting */
	static int sd_isoc_init(struct gspca_dev *gspca_dev)
	{
	struct sd sd = (struct sd ) gspca_dev;

	return sd->dev_configure_alt(gspca_dev);
	}

	/* This function is called to start the webcam */
	static int sd_start(struct gspca_dev *gspca_dev)
	{
	struct sd sd = (struct sd ) gspca_dev;

	return sd->dev_init_pre_alt(gspca_dev);
	}

	/* This function is called to stop the webcam */
	static void sd_stop0(struct gspca_dev *gspca_dev)
	{
	struct sd sd = (struct sd ) gspca_dev;

	return sd->dev_post_unset_alt(gspca_dev);
	}

	/* This function is called when an image is being received */
	static void sd_pkt_scan(struct gspca_dev *gspca_dev,
	u8 *data, int len)
	{
	struct sd sd = (struct sd ) gspca_dev;
	static s32 nSkipped;

	s32 mode = (s32) gspca_dev->curr_mode;
	s32 nToSkip =
	sd->swapRB * (gspca_dev->cam.cam_mode[mode].bytesperline + 1);

	/* Test only against 0202h, so endianess does not matter */
	switch ((s16 ) data) {
	case 0x0202: /* End of frame, start a new one */
	gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
	nSkipped = 0;
	if (sd->nbIm >= 0 && sd->nbIm < 10)
	sd->nbIm++;
	gspca_frame_add(gspca_dev, FIRST_PACKET, NULL, 0);
	break;

	default:
	data += 2;
	len -= 2;
	if (nSkipped + len <= nToSkip)
	nSkipped += len;
	else {
	if (nSkipped < nToSkip && nSkipped + len > nToSkip) {
	data += nToSkip - nSkipped;
	len -= nToSkip - nSkipped;
	nSkipped = nToSkip + 1;
	}
	gspca_frame_add(gspca_dev,
	INTER_PACKET, data, len);
	}
	break;
	}
	}

	/* This function is called when an image has been read */
	/* This function is used to monitor webcam orientation */
	static void sd_callback(struct gspca_dev *gspca_dev)
	{
	struct sd sd = (struct sd ) gspca_dev;

	if (!_OV9655_) {
	u8 state;
	u8 upsideDown;

	/* Probe sensor orientation */
	ctrl_in(gspca_dev, 0xc0, 2, 0x0000, 0x0000, 1, (void *)&state);

	/* C8/40 means upside-down (looking backwards) */
	/* D8/50 means right-up (looking onwards) */
	upsideDown = (state == 0xc8 \|\| state == 0x40);

	if (upsideDown && sd->nbRightUp > -4) {
	if (sd->nbRightUp > 0)
	sd->nbRightUp = 0;
	if (sd->nbRightUp == -3) {
	sd->mirrorMask = 1;
	sd->waitSet = 1;
	}
	sd->nbRightUp--;
	}
	if (!upsideDown && sd->nbRightUp < 4) {
	if (sd->nbRightUp < 0)
	sd->nbRightUp = 0;
	if (sd->nbRightUp == 3) {
	sd->mirrorMask = 0;
	sd->waitSet = 1;
	}
	sd->nbRightUp++;
	}
	}

	if (sd->waitSet)
	sd->dev_camera_settings(gspca_dev);
	}

	/=================== USB driver structure initialisation ==================/

	static const __devinitdata struct usb_device_id device_table[] = {
	{USB_DEVICE(0x05e3, 0x0503)},
	{USB_DEVICE(0x05e3, 0xf191)},
	{}
	};

	MODULE_DEVICE_TABLE(usb, device_table);

	static int sd_probe(struct usb_interface *intf,
	const struct usb_device_id *id)
	{
	struct gspca_dev *gspca_dev;
	s32 ret;

	ret = gspca_dev_probe(intf, id,
	&sd_desc_mi1320, sizeof(struct sd), THIS_MODULE);

	if (ret >= 0) {
	gspca_dev = usb_get_intfdata(intf);

	PDEBUG(D_PROBE,
	"Camera is now controlling video device %s",
	video_device_node_name(&gspca_dev->vdev));
	}

	return ret;
	}

	static void sd_disconnect(struct usb_interface *intf)
	{
	gspca_disconnect(intf);
	}

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

	/====================== Init and Exit module functions ====================/

	static int __init sd_mod_init(void)
	{
	PDEBUG(D_PROBE, "driver startup - version %s", DRIVER_VERSION);

	if (usb_register(&sd_driver) < 0)
	return -1;
	return 0;
	}

	static void __exit sd_mod_exit(void)
	{
	usb_deregister(&sd_driver);
	}

	module_init(sd_mod_init);
	module_exit(sd_mod_exit);

	/==========================================================================/

	int gl860_RTx(struct gspca_dev *gspca_dev,
	unsigned char pref, u32 req, u16 val, u16 index,
	s32 len, void *pdata)
	{
	struct usb_device *udev = gspca_dev->dev;
	s32 r = 0;

	if (pref == 0x40) { /* Send */
	if (len > 0) {
	memcpy(gspca_dev->usb_buf, pdata, len);
	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
	req, pref, val, index,
	gspca_dev->usb_buf,
	len, 400 + 200 * (len > 1));
	} else {
	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
	req, pref, val, index, NULL, len, 400);
	}
	} else { /* Receive */
	if (len > 0) {
	r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
	req, pref, val, index,
	gspca_dev->usb_buf,
	len, 400 + 200 * (len > 1));
	memcpy(pdata, gspca_dev->usb_buf, len);
	} else {
	r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
	req, pref, val, index, NULL, len, 400);
	}
	}

	if (r < 0)
	err("ctrl transfer failed %4d "
	"[p%02x r%d v%04x i%04x len%d]",
	r, pref, req, val, index, len);
	else if (len > 1 && r < len)
	PDEBUG(D_ERR, "short ctrl transfer %d/%d", r, len);

	msleep(1);

	return r;
	}

	int fetch_validx(struct gspca_dev gspca_dev, struct validx tbl, int len)
	{
	int n;

	for (n = 0; n < len; n++) {
	if (tbl[n].idx != 0xffff)
	ctrl_out(gspca_dev, 0x40, 1, tbl[n].val,
	tbl[n].idx, 0, NULL);
	else if (tbl[n].val == 0xffff)
	break;
	else
	msleep(tbl[n].val);
	}
	return n;
	}

	int keep_on_fetching_validx(struct gspca_dev gspca_dev, struct validx tbl,
	int len, int n)
	{
	while (++n < len) {
	if (tbl[n].idx != 0xffff)
	ctrl_out(gspca_dev, 0x40, 1, tbl[n].val, tbl[n].idx,
	0, NULL);
	else if (tbl[n].val == 0xffff)
	break;
	else
	msleep(tbl[n].val);
	}
	return n;
	}

	void fetch_idxdata(struct gspca_dev gspca_dev, struct idxdata tbl, int len)
	{
	int n;

	for (n = 0; n < len; n++) {
	if (memcmp(tbl[n].data, "\xff\xff\xff", 3) != 0)
	ctrl_out(gspca_dev, 0x40, 3, 0x7a00, tbl[n].idx,
	3, tbl[n].data);
	else
	msleep(tbl[n].idx);
	}
	}

	static int gl860_guess_sensor(struct gspca_dev *gspca_dev,
	u16 vendor_id, u16 product_id)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 probe, nb26, nb96, nOV, ntry;

	if (product_id == 0xf191)
	sd->sensor = ID_MI1320;

	if (sd->sensor == 0xff) {
	ctrl_in(gspca_dev, 0xc0, 2, 0x0000, 0x0004, 1, &probe);
	ctrl_in(gspca_dev, 0xc0, 2, 0x0000, 0x0004, 1, &probe);

	ctrl_out(gspca_dev, 0x40, 1, 0x0000, 0x0000, 0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x0010, 0x0010, 0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x0008, 0x00c0, 0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x0001, 0x00c1, 0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x0001, 0x00c2, 0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x0020, 0x0006, 0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x006a, 0x000d, 0, NULL);
	msleep(56);

	PDEBUG(D_PROBE, "probing for sensor MI2020 or OVXXXX");
	nOV = 0;
	for (ntry = 0; ntry < 4; ntry++) {
	ctrl_out(gspca_dev, 0x40, 1, 0x0040, 0x0000, 0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x0063, 0x0006, 0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x7a00, 0x8030, 0, NULL);
	msleep(10);
	ctrl_in(gspca_dev, 0xc0, 2, 0x7a00, 0x8030, 1, &probe);
	PDEBUG(D_PROBE, "probe=0x%02x", probe);
	if (probe == 0xff)
	nOV++;
	}

	if (nOV) {
	PDEBUG(D_PROBE, "0xff -> OVXXXX");
	PDEBUG(D_PROBE, "probing for sensor OV2640 or OV9655");

	nb26 = nb96 = 0;
	for (ntry = 0; ntry < 4; ntry++) {
	ctrl_out(gspca_dev, 0x40, 1, 0x0040, 0x0000,
	0, NULL);
	msleep(3);
	ctrl_out(gspca_dev, 0x40, 1, 0x6000, 0x800a,
	0, NULL);
	msleep(10);

	/* Wait for 26(OV2640) or 96(OV9655) */
	ctrl_in(gspca_dev, 0xc0, 2, 0x6000, 0x800a,
	1, &probe);

	if (probe == 0x26 \|\| probe == 0x40) {
	PDEBUG(D_PROBE,
	"probe=0x%02x -> OV2640",
	probe);
	sd->sensor = ID_OV2640;
	nb26 += 4;
	break;
	}
	if (probe == 0x96 \|\| probe == 0x55) {
	PDEBUG(D_PROBE,
	"probe=0x%02x -> OV9655",
	probe);
	sd->sensor = ID_OV9655;
	nb96 += 4;
	break;
	}
	PDEBUG(D_PROBE, "probe=0x%02x", probe);
	if (probe == 0x00)
	nb26++;
	if (probe == 0xff)
	nb96++;
	msleep(3);
	}
	if (nb26 < 4 && nb96 < 4)
	return -1;
	} else {
	PDEBUG(D_PROBE, "Not any 0xff -> MI2020");
	sd->sensor = ID_MI2020;
	}
	}

	if (_MI1320_) {
	PDEBUG(D_PROBE, "05e3:f191 sensor MI1320 (1.3M)");
	} else if (_MI2020_) {
	PDEBUG(D_PROBE, "05e3:0503 sensor MI2020 (2.0M)");
	} else if (_OV9655_) {
	PDEBUG(D_PROBE, "05e3:0503 sensor OV9655 (1.3M)");
	} else if (_OV2640_) {
	PDEBUG(D_PROBE, "05e3:0503 sensor OV2640 (2.0M)");
	} else {
	PDEBUG(D_PROBE, "*** Unknown sensor ***");
	return -1;
	}

	return 0;
	}