drivers/media/usb/gspca/stk014.c - maze/linux - Git at Google

 /*
  * Syntek DV4000 (STK014) subdriver
  *
  * Copyright (C) 2008 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 "stk014"

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

 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
 MODULE_DESCRIPTION("Syntek DV4000 (STK014) USB Camera Driver");
 MODULE_LICENSE("GPL");

 #define QUALITY 50

 /* specific webcam descriptor */
 struct sd {
 	struct gspca_dev gspca_dev;	/* !! must be the first item */
 	u8 jpeg_hdr[JPEG_HDR_SZ];
 };

 static const struct v4l2_pix_format vga_mode[] = {
 	{320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 		.bytesperline = 320,
 		.sizeimage = 320 * 240 * 3 / 8 + 590,
 		.colorspace = V4L2_COLORSPACE_JPEG,
 		.priv = 1},
 	{640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 		.bytesperline = 640,
 		.sizeimage = 640 * 480 * 3 / 8 + 590,
 		.colorspace = V4L2_COLORSPACE_JPEG,
 		.priv = 0},
 };

 /* -- read a register -- */
 static u8 reg_r(struct gspca_dev *gspca_dev,
 			__u16 index)
 {
 	struct usb_device *dev = gspca_dev->dev;
 	int ret;

 	if (gspca_dev->usb_err < 0)
 		return 0;
 	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 			0x00,
 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			0x00,
 			index,
 			gspca_dev->usb_buf, 1,
 			500);
 	if (ret < 0) {
 		pr_err("reg_r err %d\n", ret);
 		gspca_dev->usb_err = ret;
 		return 0;
 	}
 	return gspca_dev->usb_buf[0];
 }

 /* -- write a register -- */
 static void reg_w(struct gspca_dev *gspca_dev,
 			__u16 index, __u16 value)
 {
 	struct usb_device *dev = gspca_dev->dev;
 	int ret;

 	if (gspca_dev->usb_err < 0)
 		return;
 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 			0x01,
 			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			value,
 			index,
 			NULL,
 			0,
 			500);
 	if (ret < 0) {
 		pr_err("reg_w err %d\n", ret);
 		gspca_dev->usb_err = ret;
 	}
 }

 /* -- get a bulk value (4 bytes) -- */
 static void rcv_val(struct gspca_dev *gspca_dev,
 			int ads)
 {
 	struct usb_device *dev = gspca_dev->dev;
 	int alen, ret;

 	reg_w(gspca_dev, 0x634, (ads >> 16) & 0xff);
 	reg_w(gspca_dev, 0x635, (ads >> 8) & 0xff);
 	reg_w(gspca_dev, 0x636, ads & 0xff);
 	reg_w(gspca_dev, 0x637, 0);
 	reg_w(gspca_dev, 0x638, 4);	/* len & 0xff */
 	reg_w(gspca_dev, 0x639, 0);	/* len >> 8 */
 	reg_w(gspca_dev, 0x63a, 0);
 	reg_w(gspca_dev, 0x63b, 0);
 	reg_w(gspca_dev, 0x630, 5);
 	if (gspca_dev->usb_err < 0)
 		return;
 	ret = usb_bulk_msg(dev,
 			usb_rcvbulkpipe(dev, 0x05),
 			gspca_dev->usb_buf,
 			4,		/* length */
 			&alen,
 			500);		/* timeout in milliseconds */
 	if (ret < 0) {
 		pr_err("rcv_val err %d\n", ret);
 		gspca_dev->usb_err = ret;
 	}
 }

 /* -- send a bulk value -- */
 static void snd_val(struct gspca_dev *gspca_dev,
 			int ads,
 			unsigned int val)
 {
 	struct usb_device *dev = gspca_dev->dev;
 	int alen, ret;
 	__u8 seq = 0;

 	if (ads == 0x003f08) {
 		reg_r(gspca_dev, 0x0704);
 		seq = reg_r(gspca_dev, 0x0705);
 		reg_r(gspca_dev, 0x0650);
 		reg_w(gspca_dev, 0x654, seq);
 	} else {
 		reg_w(gspca_dev, 0x654, (ads >> 16) & 0xff);
 	}
 	reg_w(gspca_dev, 0x655, (ads >> 8) & 0xff);
 	reg_w(gspca_dev, 0x656, ads & 0xff);
 	reg_w(gspca_dev, 0x657, 0);
 	reg_w(gspca_dev, 0x658, 0x04);	/* size */
 	reg_w(gspca_dev, 0x659, 0);
 	reg_w(gspca_dev, 0x65a, 0);
 	reg_w(gspca_dev, 0x65b, 0);
 	reg_w(gspca_dev, 0x650, 5);
 	if (gspca_dev->usb_err < 0)
 		return;
 	gspca_dev->usb_buf[0] = val >> 24;
 	gspca_dev->usb_buf[1] = val >> 16;
 	gspca_dev->usb_buf[2] = val >> 8;
 	gspca_dev->usb_buf[3] = val;
 	ret = usb_bulk_msg(dev,
 			usb_sndbulkpipe(dev, 6),
 			gspca_dev->usb_buf,
 			4,
 			&alen,
 			500);	/* timeout in milliseconds */
 	if (ret < 0) {
 		pr_err("snd_val err %d\n", ret);
 		gspca_dev->usb_err = ret;
 	} else {
 		if (ads == 0x003f08) {
 			seq += 4;
 			seq &= 0x3f;
 			reg_w(gspca_dev, 0x705, seq);
 		}
 	}
 }

 /* set a camera parameter */
 static void set_par(struct gspca_dev *gspca_dev,
 		   int parval)
 {
 	snd_val(gspca_dev, 0x003f08, parval);
 }

 static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
 {
 	int parval;

 	parval = 0x06000000		/* whiteness */
 		+ (val << 16);
 	set_par(gspca_dev, parval);
 }

 static void setcontrast(struct gspca_dev *gspca_dev, s32 val)
 {
 	int parval;

 	parval = 0x07000000		/* contrast */
 		+ (val << 16);
 	set_par(gspca_dev, parval);
 }

 static void setcolors(struct gspca_dev *gspca_dev, s32 val)
 {
 	int parval;

 	parval = 0x08000000		/* saturation */
 		+ (val << 16);
 	set_par(gspca_dev, parval);
 }

 static void setlightfreq(struct gspca_dev *gspca_dev, s32 val)
 {
 	set_par(gspca_dev, val == 1
 			? 0x33640000		/* 50 Hz */
 			: 0x33780000);		/* 60 Hz */
 }

 /* this function is called at probe time */
 static int sd_config(struct gspca_dev *gspca_dev,
 			const struct usb_device_id *id)
 {
 	gspca_dev->cam.cam_mode = vga_mode;
 	gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
 	return 0;
 }

 /* this function is called at probe and resume time */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
 	u8 ret;

 	/* check if the device responds */
 	usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);
 	ret = reg_r(gspca_dev, 0x0740);
 	if (gspca_dev->usb_err >= 0) {
 		if (ret != 0xff) {
 			pr_err("init reg: 0x%02x\n", ret);
 			gspca_dev->usb_err = -EIO;
 		}
 	}
 	return gspca_dev->usb_err;
 }

 /* -- start the camera -- */
 static int sd_start(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	int ret, value;

 	/* create the JPEG header */
 	jpeg_define(sd->jpeg_hdr, gspca_dev->height, gspca_dev->width,
 			0x22);		/* JPEG 411 */
 	jpeg_set_qual(sd->jpeg_hdr, QUALITY);

 	/* work on alternate 1 */
 	usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);

 	set_par(gspca_dev, 0x10000000);
 	set_par(gspca_dev, 0x00000000);
 	set_par(gspca_dev, 0x8002e001);
 	set_par(gspca_dev, 0x14000000);
 	if (gspca_dev->width > 320)
 		value = 0x8002e001;		/* 640x480 */
 	else
 		value = 0x4001f000;		/* 320x240 */
 	set_par(gspca_dev, value);
 	ret = usb_set_interface(gspca_dev->dev,
 					gspca_dev->iface,
 					gspca_dev->alt);
 	if (ret < 0) {
 		pr_err("set intf %d %d failed\n",
 		       gspca_dev->iface, gspca_dev->alt);
 		gspca_dev->usb_err = ret;
 		goto out;
 	}
 	 reg_r(gspca_dev, 0x0630);
 	rcv_val(gspca_dev, 0x000020);	/* << (value ff ff ff ff) */
 	reg_r(gspca_dev, 0x0650);
 	snd_val(gspca_dev, 0x000020, 0xffffffff);
 	reg_w(gspca_dev, 0x0620, 0);
 	reg_w(gspca_dev, 0x0630, 0);
 	reg_w(gspca_dev, 0x0640, 0);
 	reg_w(gspca_dev, 0x0650, 0);
 	reg_w(gspca_dev, 0x0660, 0);
 	set_par(gspca_dev, 0x09800000);		/* Red ? */
 	set_par(gspca_dev, 0x0a800000);		/* Green ? */
 	set_par(gspca_dev, 0x0b800000);		/* Blue ? */
 	set_par(gspca_dev, 0x0d030000);		/* Gamma ? */

 	/* start the video flow */
 	set_par(gspca_dev, 0x01000000);
 	set_par(gspca_dev, 0x01000000);
 	if (gspca_dev->usb_err >= 0)
 		PDEBUG(D_STREAM, "camera started alt: 0x%02x",
 				gspca_dev->alt);
 out:
 	return gspca_dev->usb_err;
 }

 static void sd_stopN(struct gspca_dev *gspca_dev)
 {
 	struct usb_device *dev = gspca_dev->dev;

 	set_par(gspca_dev, 0x02000000);
 	set_par(gspca_dev, 0x02000000);
 	usb_set_interface(dev, gspca_dev->iface, 1);
 	reg_r(gspca_dev, 0x0630);
 	rcv_val(gspca_dev, 0x000020);	/* << (value ff ff ff ff) */
 	reg_r(gspca_dev, 0x0650);
 	snd_val(gspca_dev, 0x000020, 0xffffffff);
 	reg_w(gspca_dev, 0x0620, 0);
 	reg_w(gspca_dev, 0x0630, 0);
 	reg_w(gspca_dev, 0x0640, 0);
 	reg_w(gspca_dev, 0x0650, 0);
 	reg_w(gspca_dev, 0x0660, 0);
 	PDEBUG(D_STREAM, "camera stopped");
 }

 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;
 	static unsigned char ffd9[] = {0xff, 0xd9};

 	/* a frame starts with:
 	 *	- 0xff 0xfe
 	 *	- 0x08 0x00	- length (little endian ?!)
 	 *	- 4 bytes = size of whole frame (BE - including header)
 	 *	- 0x00 0x0c
 	 *	- 0xff 0xd8
 	 *	- ..	JPEG image with escape sequences (ff 00)
 	 *		(without ending - ff d9)
 	 */
 	if (data[0] == 0xff && data[1] == 0xfe) {
 		gspca_frame_add(gspca_dev, LAST_PACKET,
 				ffd9, 2);

 		/* put the JPEG 411 header */
 		gspca_frame_add(gspca_dev, FIRST_PACKET,
 			sd->jpeg_hdr, JPEG_HDR_SZ);

 		/* beginning of the frame */
 #define STKHDRSZ 12
 		data += STKHDRSZ;
 		len -= STKHDRSZ;
 	}
 	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);

 	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:
 		setcontrast(gspca_dev, ctrl->val);
 		break;
 	case V4L2_CID_SATURATION:
 		setcolors(gspca_dev, ctrl->val);
 		break;
 	case V4L2_CID_POWER_LINE_FREQUENCY:
 		setlightfreq(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(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, 4);
 	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 			V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
 	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 			V4L2_CID_CONTRAST, 0, 255, 1, 127);
 	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 			V4L2_CID_SATURATION, 0, 255, 1, 127);
 	v4l2_ctrl_new_std_menu(hdl, &sd_ctrl_ops,
 			V4L2_CID_POWER_LINE_FREQUENCY,
 			V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 1,
 			V4L2_CID_POWER_LINE_FREQUENCY_50HZ);

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

 /* sub-driver description */
 static const struct sd_desc sd_desc = {
 	.name = MODULE_NAME,
 	.config = sd_config,
 	.init = sd_init,
 	.init_controls = sd_init_controls,
 	.start = sd_start,
 	.stopN = sd_stopN,
 	.pkt_scan = sd_pkt_scan,
 };

 /* -- module initialisation -- */
 static const struct usb_device_id device_table[] = {
 	{USB_DEVICE(0x05e1, 0x0893)},
 	{}
 };
 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,
 #ifdef CONFIG_PM
 	.suspend = gspca_suspend,
 	.resume = gspca_resume,
 	.reset_resume = gspca_resume,
 #endif
 };

 module_usb_driver(sd_driver);
	/*
	* Syntek DV4000 (STK014) subdriver
	*
	* Copyright (C) 2008 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 "stk014"

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

	MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
	MODULE_DESCRIPTION("Syntek DV4000 (STK014) USB Camera Driver");
	MODULE_LICENSE("GPL");

	#define QUALITY 50

	/* specific webcam descriptor */
	struct sd {
	struct gspca_dev gspca_dev; /* !! must be the first item */
	u8 jpeg_hdr[JPEG_HDR_SZ];
	};

	static const struct v4l2_pix_format vga_mode[] = {
	{320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
	.bytesperline = 320,
	.sizeimage = 320 * 240 * 3 / 8 + 590,
	.colorspace = V4L2_COLORSPACE_JPEG,
	.priv = 1},
	{640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
	.bytesperline = 640,
	.sizeimage = 640 * 480 * 3 / 8 + 590,
	.colorspace = V4L2_COLORSPACE_JPEG,
	.priv = 0},
	};

	/* -- read a register -- */
	static u8 reg_r(struct gspca_dev *gspca_dev,
	__u16 index)
	{
	struct usb_device *dev = gspca_dev->dev;
	int ret;

	if (gspca_dev->usb_err < 0)
	return 0;
	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
	0x00,
	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	0x00,
	index,
	gspca_dev->usb_buf, 1,
	500);
	if (ret < 0) {
	pr_err("reg_r err %d\n", ret);
	gspca_dev->usb_err = ret;
	return 0;
	}
	return gspca_dev->usb_buf[0];
	}

	/* -- write a register -- */
	static void reg_w(struct gspca_dev *gspca_dev,
	__u16 index, __u16 value)
	{
	struct usb_device *dev = gspca_dev->dev;
	int ret;

	if (gspca_dev->usb_err < 0)
	return;
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
	0x01,
	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value,
	index,
	NULL,
	0,
	500);
	if (ret < 0) {
	pr_err("reg_w err %d\n", ret);
	gspca_dev->usb_err = ret;
	}
	}

	/* -- get a bulk value (4 bytes) -- */
	static void rcv_val(struct gspca_dev *gspca_dev,
	int ads)
	{
	struct usb_device *dev = gspca_dev->dev;
	int alen, ret;

	reg_w(gspca_dev, 0x634, (ads >> 16) & 0xff);
	reg_w(gspca_dev, 0x635, (ads >> 8) & 0xff);
	reg_w(gspca_dev, 0x636, ads & 0xff);
	reg_w(gspca_dev, 0x637, 0);
	reg_w(gspca_dev, 0x638, 4); /* len & 0xff */
	reg_w(gspca_dev, 0x639, 0); /* len >> 8 */
	reg_w(gspca_dev, 0x63a, 0);
	reg_w(gspca_dev, 0x63b, 0);
	reg_w(gspca_dev, 0x630, 5);
	if (gspca_dev->usb_err < 0)
	return;
	ret = usb_bulk_msg(dev,
	usb_rcvbulkpipe(dev, 0x05),
	gspca_dev->usb_buf,
	4, /* length */
	&alen,
	500); /* timeout in milliseconds */
	if (ret < 0) {
	pr_err("rcv_val err %d\n", ret);
	gspca_dev->usb_err = ret;
	}
	}

	/* -- send a bulk value -- */
	static void snd_val(struct gspca_dev *gspca_dev,
	int ads,
	unsigned int val)
	{
	struct usb_device *dev = gspca_dev->dev;
	int alen, ret;
	__u8 seq = 0;

	if (ads == 0x003f08) {
	reg_r(gspca_dev, 0x0704);
	seq = reg_r(gspca_dev, 0x0705);
	reg_r(gspca_dev, 0x0650);
	reg_w(gspca_dev, 0x654, seq);
	} else {
	reg_w(gspca_dev, 0x654, (ads >> 16) & 0xff);
	}
	reg_w(gspca_dev, 0x655, (ads >> 8) & 0xff);
	reg_w(gspca_dev, 0x656, ads & 0xff);
	reg_w(gspca_dev, 0x657, 0);
	reg_w(gspca_dev, 0x658, 0x04); /* size */
	reg_w(gspca_dev, 0x659, 0);
	reg_w(gspca_dev, 0x65a, 0);
	reg_w(gspca_dev, 0x65b, 0);
	reg_w(gspca_dev, 0x650, 5);
	if (gspca_dev->usb_err < 0)
	return;
	gspca_dev->usb_buf[0] = val >> 24;
	gspca_dev->usb_buf[1] = val >> 16;
	gspca_dev->usb_buf[2] = val >> 8;
	gspca_dev->usb_buf[3] = val;
	ret = usb_bulk_msg(dev,
	usb_sndbulkpipe(dev, 6),
	gspca_dev->usb_buf,
	4,
	&alen,
	500); /* timeout in milliseconds */
	if (ret < 0) {
	pr_err("snd_val err %d\n", ret);
	gspca_dev->usb_err = ret;
	} else {
	if (ads == 0x003f08) {
	seq += 4;
	seq &= 0x3f;
	reg_w(gspca_dev, 0x705, seq);
	}
	}
	}

	/* set a camera parameter */
	static void set_par(struct gspca_dev *gspca_dev,
	int parval)
	{
	snd_val(gspca_dev, 0x003f08, parval);
	}

	static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
	{
	int parval;

	parval = 0x06000000 /* whiteness */
	+ (val << 16);
	set_par(gspca_dev, parval);
	}

	static void setcontrast(struct gspca_dev *gspca_dev, s32 val)
	{
	int parval;

	parval = 0x07000000 /* contrast */
	+ (val << 16);
	set_par(gspca_dev, parval);
	}

	static void setcolors(struct gspca_dev *gspca_dev, s32 val)
	{
	int parval;

	parval = 0x08000000 /* saturation */
	+ (val << 16);
	set_par(gspca_dev, parval);
	}

	static void setlightfreq(struct gspca_dev *gspca_dev, s32 val)
	{
	set_par(gspca_dev, val == 1
	? 0x33640000 /* 50 Hz */
	: 0x33780000); /* 60 Hz */
	}

	/* this function is called at probe time */
	static int sd_config(struct gspca_dev *gspca_dev,
	const struct usb_device_id *id)
	{
	gspca_dev->cam.cam_mode = vga_mode;
	gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
	return 0;
	}

	/* this function is called at probe and resume time */
	static int sd_init(struct gspca_dev *gspca_dev)
	{
	u8 ret;

	/* check if the device responds */
	usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);
	ret = reg_r(gspca_dev, 0x0740);
	if (gspca_dev->usb_err >= 0) {
	if (ret != 0xff) {
	pr_err("init reg: 0x%02x\n", ret);
	gspca_dev->usb_err = -EIO;
	}
	}
	return gspca_dev->usb_err;
	}

	/* -- start the camera -- */
	static int sd_start(struct gspca_dev *gspca_dev)
	{
	struct sd sd = (struct sd ) gspca_dev;
	int ret, value;

	/* create the JPEG header */
	jpeg_define(sd->jpeg_hdr, gspca_dev->height, gspca_dev->width,
	0x22); /* JPEG 411 */
	jpeg_set_qual(sd->jpeg_hdr, QUALITY);

	/* work on alternate 1 */
	usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);

	set_par(gspca_dev, 0x10000000);
	set_par(gspca_dev, 0x00000000);
	set_par(gspca_dev, 0x8002e001);
	set_par(gspca_dev, 0x14000000);
	if (gspca_dev->width > 320)
	value = 0x8002e001; /* 640x480 */
	else
	value = 0x4001f000; /* 320x240 */
	set_par(gspca_dev, value);
	ret = usb_set_interface(gspca_dev->dev,
	gspca_dev->iface,
	gspca_dev->alt);
	if (ret < 0) {
	pr_err("set intf %d %d failed\n",
	gspca_dev->iface, gspca_dev->alt);
	gspca_dev->usb_err = ret;
	goto out;
	}
	reg_r(gspca_dev, 0x0630);
	rcv_val(gspca_dev, 0x000020); /* << (value ff ff ff ff) */
	reg_r(gspca_dev, 0x0650);
	snd_val(gspca_dev, 0x000020, 0xffffffff);
	reg_w(gspca_dev, 0x0620, 0);
	reg_w(gspca_dev, 0x0630, 0);
	reg_w(gspca_dev, 0x0640, 0);
	reg_w(gspca_dev, 0x0650, 0);
	reg_w(gspca_dev, 0x0660, 0);
	set_par(gspca_dev, 0x09800000); /* Red ? */
	set_par(gspca_dev, 0x0a800000); /* Green ? */
	set_par(gspca_dev, 0x0b800000); /* Blue ? */
	set_par(gspca_dev, 0x0d030000); /* Gamma ? */

	/* start the video flow */
	set_par(gspca_dev, 0x01000000);
	set_par(gspca_dev, 0x01000000);
	if (gspca_dev->usb_err >= 0)
	PDEBUG(D_STREAM, "camera started alt: 0x%02x",
	gspca_dev->alt);
	out:
	return gspca_dev->usb_err;
	}

	static void sd_stopN(struct gspca_dev *gspca_dev)
	{
	struct usb_device *dev = gspca_dev->dev;

	set_par(gspca_dev, 0x02000000);
	set_par(gspca_dev, 0x02000000);
	usb_set_interface(dev, gspca_dev->iface, 1);
	reg_r(gspca_dev, 0x0630);
	rcv_val(gspca_dev, 0x000020); /* << (value ff ff ff ff) */
	reg_r(gspca_dev, 0x0650);
	snd_val(gspca_dev, 0x000020, 0xffffffff);
	reg_w(gspca_dev, 0x0620, 0);
	reg_w(gspca_dev, 0x0630, 0);
	reg_w(gspca_dev, 0x0640, 0);
	reg_w(gspca_dev, 0x0650, 0);
	reg_w(gspca_dev, 0x0660, 0);
	PDEBUG(D_STREAM, "camera stopped");
	}

	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;
	static unsigned char ffd9[] = {0xff, 0xd9};

	/* a frame starts with:
	* - 0xff 0xfe
	* - 0x08 0x00 - length (little endian ?!)
	* - 4 bytes = size of whole frame (BE - including header)
	* - 0x00 0x0c
	* - 0xff 0xd8
	* - .. JPEG image with escape sequences (ff 00)
	* (without ending - ff d9)
	*/
	if (data[0] == 0xff && data[1] == 0xfe) {
	gspca_frame_add(gspca_dev, LAST_PACKET,
	ffd9, 2);

	/* put the JPEG 411 header */
	gspca_frame_add(gspca_dev, FIRST_PACKET,
	sd->jpeg_hdr, JPEG_HDR_SZ);

	/* beginning of the frame */
	#define STKHDRSZ 12
	data += STKHDRSZ;
	len -= STKHDRSZ;
	}
	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);

	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:
	setcontrast(gspca_dev, ctrl->val);
	break;
	case V4L2_CID_SATURATION:
	setcolors(gspca_dev, ctrl->val);
	break;
	case V4L2_CID_POWER_LINE_FREQUENCY:
	setlightfreq(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(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, 4);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
	V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
	V4L2_CID_CONTRAST, 0, 255, 1, 127);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
	V4L2_CID_SATURATION, 0, 255, 1, 127);
	v4l2_ctrl_new_std_menu(hdl, &sd_ctrl_ops,
	V4L2_CID_POWER_LINE_FREQUENCY,
	V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 1,
	V4L2_CID_POWER_LINE_FREQUENCY_50HZ);

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

	/* sub-driver description */
	static const struct sd_desc sd_desc = {
	.name = MODULE_NAME,
	.config = sd_config,
	.init = sd_init,
	.init_controls = sd_init_controls,
	.start = sd_start,
	.stopN = sd_stopN,
	.pkt_scan = sd_pkt_scan,
	};

	/* -- module initialisation -- */
	static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x05e1, 0x0893)},
	{}
	};
	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,
	#ifdef CONFIG_PM
	.suspend = gspca_suspend,
	.resume = gspca_resume,
	.reset_resume = gspca_resume,
	#endif
	};

	module_usb_driver(sd_driver);