drivers/media/usb/gspca/spca1528.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * spca1528 subdriver
  *
  * Copyright (C) 2010-2011 Jean-Francois Moine (http://moinejf.free.fr)
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #define MODULE_NAME "spca1528"

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

 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
 MODULE_DESCRIPTION("SPCA1528 USB Camera Driver");
 MODULE_LICENSE("GPL");

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

 	u8 pkt_seq;

 	u8 jpeg_hdr[JPEG_HDR_SZ];
 };

 static const struct v4l2_pix_format vga_mode[] = {
 /*		(does not work correctly)
 	{176, 144, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 		.bytesperline = 176,
 		.sizeimage = 176 * 144 * 5 / 8 + 590,
 		.colorspace = V4L2_COLORSPACE_JPEG,
 		.priv = 3},
 */
 	{320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 		.bytesperline = 320,
 		.sizeimage = 320 * 240 * 4 / 8 + 590,
 		.colorspace = V4L2_COLORSPACE_JPEG,
 		.priv = 2},
 	{640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
 		.bytesperline = 640,
 		.sizeimage = 640 * 480 * 3 / 8 + 590,
 		.colorspace = V4L2_COLORSPACE_JPEG,
 		.priv = 1},
 };

 /* read <len> bytes to gspca usb_buf */
 static void reg_r(struct gspca_dev *gspca_dev,
 			u8 req,
 			u16 index,
 			int len)
 {
 #if USB_BUF_SZ < 64
 #error "USB buffer too small"
 #endif
 	struct usb_device *dev = gspca_dev->dev;
 	int ret;

 	if (gspca_dev->usb_err < 0)
 		return;
 	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 			req,
 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			0x0000,			/* value */
 			index,
 			gspca_dev->usb_buf, len,
 			500);
 	gspca_dbg(gspca_dev, D_USBI, "GET %02x 0000 %04x %02x\n", req, index,
 		  gspca_dev->usb_buf[0]);
 	if (ret < 0) {
 		pr_err("reg_r err %d\n", ret);
 		gspca_dev->usb_err = ret;
 		/*
 		 * Make sure the buffer is zeroed to avoid uninitialized
 		 * values.
 		 */
 		memset(gspca_dev->usb_buf, 0, USB_BUF_SZ);
 	}
 }

 static void reg_w(struct gspca_dev *gspca_dev,
 			u8 req,
 			u16 value,
 			u16 index)
 {
 	struct usb_device *dev = gspca_dev->dev;
 	int ret;

 	if (gspca_dev->usb_err < 0)
 		return;
 	gspca_dbg(gspca_dev, D_USBO, "SET %02x %04x %04x\n", req, value, index);
 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 			req,
 			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;
 	}
 }

 static void reg_wb(struct gspca_dev *gspca_dev,
 			u8 req,
 			u16 value,
 			u16 index,
 			u8 byte)
 {
 	struct usb_device *dev = gspca_dev->dev;
 	int ret;

 	if (gspca_dev->usb_err < 0)
 		return;
 	gspca_dbg(gspca_dev, D_USBO, "SET %02x %04x %04x %02x\n",
 		  req, value, index, byte);
 	gspca_dev->usb_buf[0] = byte;
 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 			req,
 			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 			value, index,
 			gspca_dev->usb_buf, 1, 500);
 	if (ret < 0) {
 		pr_err("reg_w err %d\n", ret);
 		gspca_dev->usb_err = ret;
 	}
 }

 static void wait_status_0(struct gspca_dev *gspca_dev)
 {
 	int i, w;

 	i = 16;
 	w = 0;
 	do {
 		reg_r(gspca_dev, 0x21, 0x0000, 1);
 		if (gspca_dev->usb_buf[0] == 0)
 			return;
 		w += 15;
 		msleep(w);
 	} while (--i > 0);
 	gspca_err(gspca_dev, "wait_status_0 timeout\n");
 	gspca_dev->usb_err = -ETIME;
 }

 static void wait_status_1(struct gspca_dev *gspca_dev)
 {
 	int i;

 	i = 10;
 	do {
 		reg_r(gspca_dev, 0x21, 0x0001, 1);
 		msleep(10);
 		if (gspca_dev->usb_buf[0] == 1) {
 			reg_wb(gspca_dev, 0x21, 0x0000, 0x0001, 0x00);
 			reg_r(gspca_dev, 0x21, 0x0001, 1);
 			return;
 		}
 	} while (--i > 0);
 	gspca_err(gspca_dev, "wait_status_1 timeout\n");
 	gspca_dev->usb_err = -ETIME;
 }

 static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
 {
 	reg_wb(gspca_dev, 0xc0, 0x0000, 0x00c0, val);
 }

 static void setcontrast(struct gspca_dev *gspca_dev, s32 val)
 {
 	reg_wb(gspca_dev, 0xc1, 0x0000, 0x00c1, val);
 }

 static void sethue(struct gspca_dev *gspca_dev, s32 val)
 {
 	reg_wb(gspca_dev, 0xc2, 0x0000, 0x0000, val);
 }

 static void setcolor(struct gspca_dev *gspca_dev, s32 val)
 {
 	reg_wb(gspca_dev, 0xc3, 0x0000, 0x00c3, val);
 }

 static void setsharpness(struct gspca_dev *gspca_dev, s32 val)
 {
 	reg_wb(gspca_dev, 0xc4, 0x0000, 0x00c4, val);
 }

 /* 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);
 	gspca_dev->cam.npkt = 128; /* number of packets per ISOC message */
 			/*fixme: 256 in ms-win traces*/

 	return 0;
 }

 /* this function is called at probe and resume time */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
 	reg_w(gspca_dev, 0x00, 0x0001, 0x2067);
 	reg_w(gspca_dev, 0x00, 0x00d0, 0x206b);
 	reg_w(gspca_dev, 0x00, 0x0000, 0x206c);
 	reg_w(gspca_dev, 0x00, 0x0001, 0x2069);
 	msleep(8);
 	reg_w(gspca_dev, 0x00, 0x00c0, 0x206b);
 	reg_w(gspca_dev, 0x00, 0x0000, 0x206c);
 	reg_w(gspca_dev, 0x00, 0x0001, 0x2069);

 	reg_r(gspca_dev, 0x20, 0x0000, 1);
 	reg_r(gspca_dev, 0x20, 0x0000, 5);
 	reg_r(gspca_dev, 0x23, 0x0000, 64);
 	gspca_dbg(gspca_dev, D_PROBE, "%s%s\n", &gspca_dev->usb_buf[0x1c],
 		  &gspca_dev->usb_buf[0x30]);
 	reg_r(gspca_dev, 0x23, 0x0001, 64);
 	return gspca_dev->usb_err;
 }

 /* function called at start time before URB creation */
 static int sd_isoc_init(struct gspca_dev *gspca_dev)
 {
 	u8 mode;

 	reg_r(gspca_dev, 0x00, 0x2520, 1);
 	wait_status_0(gspca_dev);
 	reg_w(gspca_dev, 0xc5, 0x0003, 0x0000);
 	wait_status_1(gspca_dev);

 	wait_status_0(gspca_dev);
 	mode = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].priv;
 	reg_wb(gspca_dev, 0x25, 0x0000, 0x0004, mode);
 	reg_r(gspca_dev, 0x25, 0x0004, 1);
 	reg_wb(gspca_dev, 0x27, 0x0000, 0x0000, 0x06);	/* 420 */
 	reg_r(gspca_dev, 0x27, 0x0000, 1);

 /* not useful..
 	gspca_dev->alt = 4;		* use alternate setting 3 */

 	return gspca_dev->usb_err;
 }

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

 	/* initialize the JPEG header */
 	jpeg_define(sd->jpeg_hdr, gspca_dev->pixfmt.height,
 			gspca_dev->pixfmt.width,
 			0x22);		/* JPEG 411 */

 	/* the JPEG quality shall be 85% */
 	jpeg_set_qual(sd->jpeg_hdr, 85);

 	reg_r(gspca_dev, 0x00, 0x2520, 1);
 	msleep(8);

 	/* start the capture */
 	wait_status_0(gspca_dev);
 	reg_w(gspca_dev, 0x31, 0x0000, 0x0004);	/* start request */
 	wait_status_1(gspca_dev);
 	wait_status_0(gspca_dev);
 	msleep(200);

 	sd->pkt_seq = 0;
 	return gspca_dev->usb_err;
 }

 static void sd_stopN(struct gspca_dev *gspca_dev)
 {
 	/* stop the capture */
 	wait_status_0(gspca_dev);
 	reg_w(gspca_dev, 0x31, 0x0000, 0x0000);	/* stop request */
 	wait_status_1(gspca_dev);
 	wait_status_0(gspca_dev);
 }

 /* move a packet adding 0x00 after 0xff */
 static void add_packet(struct gspca_dev *gspca_dev,
 			u8 *data,
 			int len)
 {
 	int i;

 	i = 0;
 	do {
 		if (data[i] == 0xff) {
 			gspca_frame_add(gspca_dev, INTER_PACKET,
 					data, i + 1);
 			len -= i;
 			data += i;
 			*data = 0x00;
 			i = 0;
 		}
 	} while (++i < len);
 	gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
 }

 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 const u8 ffd9[] = {0xff, 0xd9};

 	/* image packets start with:
 	 *	02 8n
 	 * with <n> bit:
 	 *	0x01: even (0) / odd (1) image
 	 *	0x02: end of image when set
 	 */
 	if (len < 3)
 		return;				/* empty packet */
 	if (*data == 0x02) {
 		if (data[1] & 0x02) {
 			sd->pkt_seq = !(data[1] & 1);
 			add_packet(gspca_dev, data + 2, len - 2);
 			gspca_frame_add(gspca_dev, LAST_PACKET,
 					ffd9, 2);
 			return;
 		}
 		if ((data[1] & 1) != sd->pkt_seq)
 			goto err;
 		if (gspca_dev->last_packet_type == LAST_PACKET)
 			gspca_frame_add(gspca_dev, FIRST_PACKET,
 					sd->jpeg_hdr, JPEG_HDR_SZ);
 		add_packet(gspca_dev, data + 2, len - 2);
 		return;
 	}
 err:
 	gspca_dev->last_packet_type = DISCARD_PACKET;
 }

 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_HUE:
 		sethue(gspca_dev, ctrl->val);
 		break;
 	case V4L2_CID_SATURATION:
 		setcolor(gspca_dev, ctrl->val);
 		break;
 	case V4L2_CID_SHARPNESS:
 		setsharpness(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, 5);
 	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 			V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
 	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 			V4L2_CID_CONTRAST, 0, 8, 1, 1);
 	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 			V4L2_CID_HUE, 0, 255, 1, 0);
 	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 			V4L2_CID_SATURATION, 0, 8, 1, 1);
 	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 			V4L2_CID_SHARPNESS, 0, 255, 1, 0);

 	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,
 	.isoc_init = sd_isoc_init,
 	.start = sd_start,
 	.stopN = sd_stopN,
 	.pkt_scan = sd_pkt_scan,
 };

 /* -- module initialisation -- */
 static const struct usb_device_id device_table[] = {
 	{USB_DEVICE(0x04fc, 0x1528)},
 	{}
 };
 MODULE_DEVICE_TABLE(usb, device_table);

 /* -- device connect -- */
 static int sd_probe(struct usb_interface *intf,
 			const struct usb_device_id *id)
 {
 	/* the video interface for isochronous transfer is 1 */
 	if (intf->cur_altsetting->desc.bInterfaceNumber != 1)
 		return -ENODEV;

 	return gspca_dev_probe2(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);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* spca1528 subdriver
	*
	* Copyright (C) 2010-2011 Jean-Francois Moine (http://moinejf.free.fr)
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#define MODULE_NAME "spca1528"

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

	MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
	MODULE_DESCRIPTION("SPCA1528 USB Camera Driver");
	MODULE_LICENSE("GPL");

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

	u8 pkt_seq;

	u8 jpeg_hdr[JPEG_HDR_SZ];
	};

	static const struct v4l2_pix_format vga_mode[] = {
	/* (does not work correctly)
	{176, 144, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
	.bytesperline = 176,
	.sizeimage = 176 * 144 * 5 / 8 + 590,
	.colorspace = V4L2_COLORSPACE_JPEG,
	.priv = 3},
	*/
	{320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
	.bytesperline = 320,
	.sizeimage = 320 * 240 * 4 / 8 + 590,
	.colorspace = V4L2_COLORSPACE_JPEG,
	.priv = 2},
	{640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
	.bytesperline = 640,
	.sizeimage = 640 * 480 * 3 / 8 + 590,
	.colorspace = V4L2_COLORSPACE_JPEG,
	.priv = 1},
	};

	/* read <len> bytes to gspca usb_buf */
	static void reg_r(struct gspca_dev *gspca_dev,
	u8 req,
	u16 index,
	int len)
	{
	#if USB_BUF_SZ < 64
	#error "USB buffer too small"
	#endif
	struct usb_device *dev = gspca_dev->dev;
	int ret;

	if (gspca_dev->usb_err < 0)
	return;
	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
	req,
	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	0x0000, /* value */
	index,
	gspca_dev->usb_buf, len,
	500);
	gspca_dbg(gspca_dev, D_USBI, "GET %02x 0000 %04x %02x\n", req, index,
	gspca_dev->usb_buf[0]);
	if (ret < 0) {
	pr_err("reg_r err %d\n", ret);
	gspca_dev->usb_err = ret;
	/*
	* Make sure the buffer is zeroed to avoid uninitialized
	* values.
	*/
	memset(gspca_dev->usb_buf, 0, USB_BUF_SZ);
	}
	}

	static void reg_w(struct gspca_dev *gspca_dev,
	u8 req,
	u16 value,
	u16 index)
	{
	struct usb_device *dev = gspca_dev->dev;
	int ret;

	if (gspca_dev->usb_err < 0)
	return;
	gspca_dbg(gspca_dev, D_USBO, "SET %02x %04x %04x\n", req, value, index);
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
	req,
	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;
	}
	}

	static void reg_wb(struct gspca_dev *gspca_dev,
	u8 req,
	u16 value,
	u16 index,
	u8 byte)
	{
	struct usb_device *dev = gspca_dev->dev;
	int ret;

	if (gspca_dev->usb_err < 0)
	return;
	gspca_dbg(gspca_dev, D_USBO, "SET %02x %04x %04x %02x\n",
	req, value, index, byte);
	gspca_dev->usb_buf[0] = byte;
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
	req,
	USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
	value, index,
	gspca_dev->usb_buf, 1, 500);
	if (ret < 0) {
	pr_err("reg_w err %d\n", ret);
	gspca_dev->usb_err = ret;
	}
	}

	static void wait_status_0(struct gspca_dev *gspca_dev)
	{
	int i, w;

	i = 16;
	w = 0;
	do {
	reg_r(gspca_dev, 0x21, 0x0000, 1);
	if (gspca_dev->usb_buf[0] == 0)
	return;
	w += 15;
	msleep(w);
	} while (--i > 0);
	gspca_err(gspca_dev, "wait_status_0 timeout\n");
	gspca_dev->usb_err = -ETIME;
	}

	static void wait_status_1(struct gspca_dev *gspca_dev)
	{
	int i;

	i = 10;
	do {
	reg_r(gspca_dev, 0x21, 0x0001, 1);
	msleep(10);
	if (gspca_dev->usb_buf[0] == 1) {
	reg_wb(gspca_dev, 0x21, 0x0000, 0x0001, 0x00);
	reg_r(gspca_dev, 0x21, 0x0001, 1);
	return;
	}
	} while (--i > 0);
	gspca_err(gspca_dev, "wait_status_1 timeout\n");
	gspca_dev->usb_err = -ETIME;
	}

	static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
	{
	reg_wb(gspca_dev, 0xc0, 0x0000, 0x00c0, val);
	}

	static void setcontrast(struct gspca_dev *gspca_dev, s32 val)
	{
	reg_wb(gspca_dev, 0xc1, 0x0000, 0x00c1, val);
	}

	static void sethue(struct gspca_dev *gspca_dev, s32 val)
	{
	reg_wb(gspca_dev, 0xc2, 0x0000, 0x0000, val);
	}

	static void setcolor(struct gspca_dev *gspca_dev, s32 val)
	{
	reg_wb(gspca_dev, 0xc3, 0x0000, 0x00c3, val);
	}

	static void setsharpness(struct gspca_dev *gspca_dev, s32 val)
	{
	reg_wb(gspca_dev, 0xc4, 0x0000, 0x00c4, val);
	}

	/* 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);
	gspca_dev->cam.npkt = 128; /* number of packets per ISOC message */
	/fixme: 256 in ms-win traces/

	return 0;
	}

	/* this function is called at probe and resume time */
	static int sd_init(struct gspca_dev *gspca_dev)
	{
	reg_w(gspca_dev, 0x00, 0x0001, 0x2067);
	reg_w(gspca_dev, 0x00, 0x00d0, 0x206b);
	reg_w(gspca_dev, 0x00, 0x0000, 0x206c);
	reg_w(gspca_dev, 0x00, 0x0001, 0x2069);
	msleep(8);
	reg_w(gspca_dev, 0x00, 0x00c0, 0x206b);
	reg_w(gspca_dev, 0x00, 0x0000, 0x206c);
	reg_w(gspca_dev, 0x00, 0x0001, 0x2069);

	reg_r(gspca_dev, 0x20, 0x0000, 1);
	reg_r(gspca_dev, 0x20, 0x0000, 5);
	reg_r(gspca_dev, 0x23, 0x0000, 64);
	gspca_dbg(gspca_dev, D_PROBE, "%s%s\n", &gspca_dev->usb_buf[0x1c],
	&gspca_dev->usb_buf[0x30]);
	reg_r(gspca_dev, 0x23, 0x0001, 64);
	return gspca_dev->usb_err;
	}

	/* function called at start time before URB creation */
	static int sd_isoc_init(struct gspca_dev *gspca_dev)
	{
	u8 mode;

	reg_r(gspca_dev, 0x00, 0x2520, 1);
	wait_status_0(gspca_dev);
	reg_w(gspca_dev, 0xc5, 0x0003, 0x0000);
	wait_status_1(gspca_dev);

	wait_status_0(gspca_dev);
	mode = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].priv;
	reg_wb(gspca_dev, 0x25, 0x0000, 0x0004, mode);
	reg_r(gspca_dev, 0x25, 0x0004, 1);
	reg_wb(gspca_dev, 0x27, 0x0000, 0x0000, 0x06); /* 420 */
	reg_r(gspca_dev, 0x27, 0x0000, 1);

	/* not useful..
	gspca_dev->alt = 4; * use alternate setting 3 */

	return gspca_dev->usb_err;
	}

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

	/* initialize the JPEG header */
	jpeg_define(sd->jpeg_hdr, gspca_dev->pixfmt.height,
	gspca_dev->pixfmt.width,
	0x22); /* JPEG 411 */

	/* the JPEG quality shall be 85% */
	jpeg_set_qual(sd->jpeg_hdr, 85);

	reg_r(gspca_dev, 0x00, 0x2520, 1);
	msleep(8);

	/* start the capture */
	wait_status_0(gspca_dev);
	reg_w(gspca_dev, 0x31, 0x0000, 0x0004); /* start request */
	wait_status_1(gspca_dev);
	wait_status_0(gspca_dev);
	msleep(200);

	sd->pkt_seq = 0;
	return gspca_dev->usb_err;
	}

	static void sd_stopN(struct gspca_dev *gspca_dev)
	{
	/* stop the capture */
	wait_status_0(gspca_dev);
	reg_w(gspca_dev, 0x31, 0x0000, 0x0000); /* stop request */
	wait_status_1(gspca_dev);
	wait_status_0(gspca_dev);
	}

	/* move a packet adding 0x00 after 0xff */
	static void add_packet(struct gspca_dev *gspca_dev,
	u8 *data,
	int len)
	{
	int i;

	i = 0;
	do {
	if (data[i] == 0xff) {
	gspca_frame_add(gspca_dev, INTER_PACKET,
	data, i + 1);
	len -= i;
	data += i;
	*data = 0x00;
	i = 0;
	}
	} while (++i < len);
	gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
	}

	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 const u8 ffd9[] = {0xff, 0xd9};

	/* image packets start with:
	* 02 8n
	* with <n> bit:
	* 0x01: even (0) / odd (1) image
	* 0x02: end of image when set
	*/
	if (len < 3)
	return; /* empty packet */
	if (*data == 0x02) {
	if (data[1] & 0x02) {
	sd->pkt_seq = !(data[1] & 1);
	add_packet(gspca_dev, data + 2, len - 2);
	gspca_frame_add(gspca_dev, LAST_PACKET,
	ffd9, 2);
	return;
	}
	if ((data[1] & 1) != sd->pkt_seq)
	goto err;
	if (gspca_dev->last_packet_type == LAST_PACKET)
	gspca_frame_add(gspca_dev, FIRST_PACKET,
	sd->jpeg_hdr, JPEG_HDR_SZ);
	add_packet(gspca_dev, data + 2, len - 2);
	return;
	}
	err:
	gspca_dev->last_packet_type = DISCARD_PACKET;
	}

	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_HUE:
	sethue(gspca_dev, ctrl->val);
	break;
	case V4L2_CID_SATURATION:
	setcolor(gspca_dev, ctrl->val);
	break;
	case V4L2_CID_SHARPNESS:
	setsharpness(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, 5);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
	V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
	V4L2_CID_CONTRAST, 0, 8, 1, 1);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
	V4L2_CID_HUE, 0, 255, 1, 0);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
	V4L2_CID_SATURATION, 0, 8, 1, 1);
	v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
	V4L2_CID_SHARPNESS, 0, 255, 1, 0);

	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,
	.isoc_init = sd_isoc_init,
	.start = sd_start,
	.stopN = sd_stopN,
	.pkt_scan = sd_pkt_scan,
	};

	/* -- module initialisation -- */
	static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x04fc, 0x1528)},
	{}
	};
	MODULE_DEVICE_TABLE(usb, device_table);

	/* -- device connect -- */
	static int sd_probe(struct usb_interface *intf,
	const struct usb_device_id *id)
	{
	/* the video interface for isochronous transfer is 1 */
	if (intf->cur_altsetting->desc.bInterfaceNumber != 1)
	return -ENODEV;

	return gspca_dev_probe2(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);