drivers/media/usb/gspca/stv0680.c - arm/linux-arm64-legacy - Git at Google

 /*
  * STV0680 USB Camera Driver
  *
  * Copyright (C) 2009 Hans de Goede <hdegoede@redhat.com>
  *
  * This module is adapted from the in kernel v4l1 stv680 driver:
  *
  *  STV0680 USB Camera Driver, by Kevin Sisson (kjsisson@bellsouth.net)
  *
  * Thanks to STMicroelectronics for information on the usb commands, and
  * to Steve Miller at STM for his help and encouragement while I was
  * writing this driver.
  *
  * 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
  * (at your option) 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 "stv0680"

 #include "gspca.h"

 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 MODULE_DESCRIPTION("STV0680 USB Camera Driver");
 MODULE_LICENSE("GPL");

 /* specific webcam descriptor */
 struct sd {
 	struct gspca_dev gspca_dev;		/* !! must be the first item */
 	struct v4l2_pix_format mode;
 	u8 orig_mode;
 	u8 video_mode;
 	u8 current_mode;
 };

 static int stv_sndctrl(struct gspca_dev *gspca_dev, int set, u8 req, u16 val,
 		       int size)
 {
 	int ret = -1;
 	u8 req_type = 0;
 	unsigned int pipe = 0;

 	switch (set) {
 	case 0: /*  0xc1  */
 		req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
 		pipe = usb_rcvctrlpipe(gspca_dev->dev, 0);
 		break;
 	case 1: /*  0x41  */
 		req_type = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
 		pipe = usb_sndctrlpipe(gspca_dev->dev, 0);
 		break;
 	case 2:	/*  0x80  */
 		req_type = USB_DIR_IN | USB_RECIP_DEVICE;
 		pipe = usb_rcvctrlpipe(gspca_dev->dev, 0);
 		break;
 	case 3:	/*  0x40  */
 		req_type = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
 		pipe = usb_sndctrlpipe(gspca_dev->dev, 0);
 		break;
 	}

 	ret = usb_control_msg(gspca_dev->dev, pipe,
 			      req, req_type,
 			      val, 0, gspca_dev->usb_buf, size, 500);

 	if ((ret < 0) && (req != 0x0a))
 		pr_err("usb_control_msg error %i, request = 0x%x, error = %i\n",
 		       set, req, ret);

 	return ret;
 }

 static int stv0680_handle_error(struct gspca_dev *gspca_dev, int ret)
 {
 	stv_sndctrl(gspca_dev, 0, 0x80, 0, 0x02); /* Get Last Error */
 	PDEBUG(D_ERR, "last error: %i,  command = 0x%x",
 	       gspca_dev->usb_buf[0], gspca_dev->usb_buf[1]);
 	return ret;
 }

 static int stv0680_get_video_mode(struct gspca_dev *gspca_dev)
 {
 	/* Note not sure if this init of usb_buf is really necessary */
 	memset(gspca_dev->usb_buf, 0, 8);
 	gspca_dev->usb_buf[0] = 0x0f;

 	if (stv_sndctrl(gspca_dev, 0, 0x87, 0, 0x08) != 0x08) {
 		PDEBUG(D_ERR, "Get_Camera_Mode failed");
 		return stv0680_handle_error(gspca_dev, -EIO);
 	}

 	return gspca_dev->usb_buf[0]; /* 01 = VGA, 03 = QVGA, 00 = CIF */
 }

 static int stv0680_set_video_mode(struct gspca_dev *gspca_dev, u8 mode)
 {
 	struct sd *sd = (struct sd *) gspca_dev;

 	if (sd->current_mode == mode)
 		return 0;

 	memset(gspca_dev->usb_buf, 0, 8);
 	gspca_dev->usb_buf[0] = mode;

 	if (stv_sndctrl(gspca_dev, 3, 0x07, 0x0100, 0x08) != 0x08) {
 		PDEBUG(D_ERR, "Set_Camera_Mode failed");
 		return stv0680_handle_error(gspca_dev, -EIO);
 	}

 	/* Verify we got what we've asked for */
 	if (stv0680_get_video_mode(gspca_dev) != mode) {
 		PDEBUG(D_ERR, "Error setting camera video mode!");
 		return -EIO;
 	}

 	sd->current_mode = mode;

 	return 0;
 }

 /* this function is called at probe time */
 static int sd_config(struct gspca_dev *gspca_dev,
 			const struct usb_device_id *id)
 {
 	int ret;
 	struct sd *sd = (struct sd *) gspca_dev;
 	struct cam *cam = &gspca_dev->cam;

 	/* Give the camera some time to settle, otherwise initalization will
 	   fail on hotplug, and yes it really needs a full second. */
 	msleep(1000);

 	/* ping camera to be sure STV0680 is present */
 	if (stv_sndctrl(gspca_dev, 0, 0x88, 0x5678, 0x02) != 0x02 ||
 	    gspca_dev->usb_buf[0] != 0x56 || gspca_dev->usb_buf[1] != 0x78) {
 		PDEBUG(D_ERR, "STV(e): camera ping failed!!");
 		return stv0680_handle_error(gspca_dev, -ENODEV);
 	}

 	/* get camera descriptor */
 	if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0200, 0x09) != 0x09)
 		return stv0680_handle_error(gspca_dev, -ENODEV);

 	if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0200, 0x22) != 0x22 ||
 	    gspca_dev->usb_buf[7] != 0xa0 || gspca_dev->usb_buf[8] != 0x23) {
 		PDEBUG(D_ERR, "Could not get descriptor 0200.");
 		return stv0680_handle_error(gspca_dev, -ENODEV);
 	}
 	if (stv_sndctrl(gspca_dev, 0, 0x8a, 0, 0x02) != 0x02)
 		return stv0680_handle_error(gspca_dev, -ENODEV);
 	if (stv_sndctrl(gspca_dev, 0, 0x8b, 0, 0x24) != 0x24)
 		return stv0680_handle_error(gspca_dev, -ENODEV);
 	if (stv_sndctrl(gspca_dev, 0, 0x85, 0, 0x10) != 0x10)
 		return stv0680_handle_error(gspca_dev, -ENODEV);

 	if (!(gspca_dev->usb_buf[7] & 0x09)) {
 		PDEBUG(D_ERR, "Camera supports neither CIF nor QVGA mode");
 		return -ENODEV;
 	}
 	if (gspca_dev->usb_buf[7] & 0x01)
 		PDEBUG(D_PROBE, "Camera supports CIF mode");
 	if (gspca_dev->usb_buf[7] & 0x02)
 		PDEBUG(D_PROBE, "Camera supports VGA mode");
 	if (gspca_dev->usb_buf[7] & 0x04)
 		PDEBUG(D_PROBE, "Camera supports QCIF mode");
 	if (gspca_dev->usb_buf[7] & 0x08)
 		PDEBUG(D_PROBE, "Camera supports QVGA mode");

 	if (gspca_dev->usb_buf[7] & 0x01)
 		sd->video_mode = 0x00; /* CIF */
 	else
 		sd->video_mode = 0x03; /* QVGA */

 	/* FW rev, ASIC rev, sensor ID  */
 	PDEBUG(D_PROBE, "Firmware rev is %i.%i",
 	       gspca_dev->usb_buf[0], gspca_dev->usb_buf[1]);
 	PDEBUG(D_PROBE, "ASIC rev is %i.%i",
 	       gspca_dev->usb_buf[2], gspca_dev->usb_buf[3]);
 	PDEBUG(D_PROBE, "Sensor ID is %i",
 	       (gspca_dev->usb_buf[4]*16) + (gspca_dev->usb_buf[5]>>4));


 	ret = stv0680_get_video_mode(gspca_dev);
 	if (ret < 0)
 		return ret;
 	sd->current_mode = sd->orig_mode = ret;

 	ret = stv0680_set_video_mode(gspca_dev, sd->video_mode);
 	if (ret < 0)
 		return ret;

 	/* Get mode details */
 	if (stv_sndctrl(gspca_dev, 0, 0x8f, 0, 0x10) != 0x10)
 		return stv0680_handle_error(gspca_dev, -EIO);

 	cam->bulk = 1;
 	cam->bulk_nurbs = 1; /* The cam cannot handle more */
 	cam->bulk_size = (gspca_dev->usb_buf[0] << 24) |
 			 (gspca_dev->usb_buf[1] << 16) |
 			 (gspca_dev->usb_buf[2] << 8) |
 			 (gspca_dev->usb_buf[3]);
 	sd->mode.width = (gspca_dev->usb_buf[4] << 8) |
 			 (gspca_dev->usb_buf[5]);  /* 322, 356, 644 */
 	sd->mode.height = (gspca_dev->usb_buf[6] << 8) |
 			  (gspca_dev->usb_buf[7]); /* 242, 292, 484 */
 	sd->mode.pixelformat = V4L2_PIX_FMT_STV0680;
 	sd->mode.field = V4L2_FIELD_NONE;
 	sd->mode.bytesperline = sd->mode.width;
 	sd->mode.sizeimage = cam->bulk_size;
 	sd->mode.colorspace = V4L2_COLORSPACE_SRGB;

 	/* origGain = gspca_dev->usb_buf[12]; */

 	cam->cam_mode = &sd->mode;
 	cam->nmodes = 1;


 	ret = stv0680_set_video_mode(gspca_dev, sd->orig_mode);
 	if (ret < 0)
 		return ret;

 	if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0100, 0x12) != 0x12 ||
 	    gspca_dev->usb_buf[8] != 0x53 || gspca_dev->usb_buf[9] != 0x05) {
 		pr_err("Could not get descriptor 0100\n");
 		return stv0680_handle_error(gspca_dev, -EIO);
 	}

 	return 0;
 }

 /* this function is called at probe and resume time */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
 	return 0;
 }

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

 	ret = stv0680_set_video_mode(gspca_dev, sd->video_mode);
 	if (ret < 0)
 		return ret;

 	if (stv_sndctrl(gspca_dev, 0, 0x85, 0, 0x10) != 0x10)
 		return stv0680_handle_error(gspca_dev, -EIO);

 	/* Start stream at:
 	   0x0000 = CIF (352x288)
 	   0x0100 = VGA (640x480)
 	   0x0300 = QVGA (320x240) */
 	if (stv_sndctrl(gspca_dev, 1, 0x09, sd->video_mode << 8, 0x0) != 0x0)
 		return stv0680_handle_error(gspca_dev, -EIO);

 	return 0;
 }

 static void sd_stopN(struct gspca_dev *gspca_dev)
 {
 	/* This is a high priority command; it stops all lower order cmds */
 	if (stv_sndctrl(gspca_dev, 1, 0x04, 0x0000, 0x0) != 0x0)
 		stv0680_handle_error(gspca_dev, -EIO);
 }

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

 	if (!sd->gspca_dev.present)
 		return;

 	stv0680_set_video_mode(gspca_dev, sd->orig_mode);
 }

 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 			u8 *data,
 			int len)
 {
 	struct sd *sd = (struct sd *) gspca_dev;

 	/* Every now and then the camera sends a 16 byte packet, no idea
 	   what it contains, but it is not image data, when this
 	   happens the frame received before this packet is corrupt,
 	   so discard it. */
 	if (len != sd->mode.sizeimage) {
 		gspca_dev->last_packet_type = DISCARD_PACKET;
 		return;
 	}

 	/* Finish the previous frame, we do this upon reception of the next
 	   packet, even though it is already complete so that the strange 16
 	   byte packets send after a corrupt frame can discard it. */
 	gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);

 	/* Store the just received frame */
 	gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
 }

 /* sub-driver description */
 static const struct sd_desc sd_desc = {
 	.name = MODULE_NAME,
 	.config = sd_config,
 	.init = sd_init,
 	.start = sd_start,
 	.stopN = sd_stopN,
 	.stop0 = sd_stop0,
 	.pkt_scan = sd_pkt_scan,
 };

 /* -- module initialisation -- */
 static const struct usb_device_id device_table[] = {
 	{USB_DEVICE(0x0553, 0x0202)},
 	{USB_DEVICE(0x041e, 0x4007)},
 	{}
 };
 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);
	/*
	* STV0680 USB Camera Driver
	*
	* Copyright (C) 2009 Hans de Goede <hdegoede@redhat.com>
	*
	* This module is adapted from the in kernel v4l1 stv680 driver:
	*
	* STV0680 USB Camera Driver, by Kevin Sisson (kjsisson@bellsouth.net)
	*
	* Thanks to STMicroelectronics for information on the usb commands, and
	* to Steve Miller at STM for his help and encouragement while I was
	* writing this driver.
	*
	* 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
	* (at your option) 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 "stv0680"

	#include "gspca.h"

	MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
	MODULE_DESCRIPTION("STV0680 USB Camera Driver");
	MODULE_LICENSE("GPL");

	/* specific webcam descriptor */
	struct sd {
	struct gspca_dev gspca_dev; /* !! must be the first item */
	struct v4l2_pix_format mode;
	u8 orig_mode;
	u8 video_mode;
	u8 current_mode;
	};

	static int stv_sndctrl(struct gspca_dev *gspca_dev, int set, u8 req, u16 val,
	int size)
	{
	int ret = -1;
	u8 req_type = 0;
	unsigned int pipe = 0;

	switch (set) {
	case 0: /* 0xc1 */
	req_type = USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_ENDPOINT;
	pipe = usb_rcvctrlpipe(gspca_dev->dev, 0);
	break;
	case 1: /* 0x41 */
	req_type = USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_ENDPOINT;
	pipe = usb_sndctrlpipe(gspca_dev->dev, 0);
	break;
	case 2: /* 0x80 */
	req_type = USB_DIR_IN \| USB_RECIP_DEVICE;
	pipe = usb_rcvctrlpipe(gspca_dev->dev, 0);
	break;
	case 3: /* 0x40 */
	req_type = USB_DIR_OUT \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE;
	pipe = usb_sndctrlpipe(gspca_dev->dev, 0);
	break;
	}

	ret = usb_control_msg(gspca_dev->dev, pipe,
	req, req_type,
	val, 0, gspca_dev->usb_buf, size, 500);

	if ((ret < 0) && (req != 0x0a))
	pr_err("usb_control_msg error %i, request = 0x%x, error = %i\n",
	set, req, ret);

	return ret;
	}

	static int stv0680_handle_error(struct gspca_dev *gspca_dev, int ret)
	{
	stv_sndctrl(gspca_dev, 0, 0x80, 0, 0x02); /* Get Last Error */
	PDEBUG(D_ERR, "last error: %i, command = 0x%x",
	gspca_dev->usb_buf[0], gspca_dev->usb_buf[1]);
	return ret;
	}

	static int stv0680_get_video_mode(struct gspca_dev *gspca_dev)
	{
	/* Note not sure if this init of usb_buf is really necessary */
	memset(gspca_dev->usb_buf, 0, 8);
	gspca_dev->usb_buf[0] = 0x0f;

	if (stv_sndctrl(gspca_dev, 0, 0x87, 0, 0x08) != 0x08) {
	PDEBUG(D_ERR, "Get_Camera_Mode failed");
	return stv0680_handle_error(gspca_dev, -EIO);
	}

	return gspca_dev->usb_buf[0]; /* 01 = VGA, 03 = QVGA, 00 = CIF */
	}

	static int stv0680_set_video_mode(struct gspca_dev *gspca_dev, u8 mode)
	{
	struct sd sd = (struct sd ) gspca_dev;

	if (sd->current_mode == mode)
	return 0;

	memset(gspca_dev->usb_buf, 0, 8);
	gspca_dev->usb_buf[0] = mode;

	if (stv_sndctrl(gspca_dev, 3, 0x07, 0x0100, 0x08) != 0x08) {
	PDEBUG(D_ERR, "Set_Camera_Mode failed");
	return stv0680_handle_error(gspca_dev, -EIO);
	}

	/* Verify we got what we've asked for */
	if (stv0680_get_video_mode(gspca_dev) != mode) {
	PDEBUG(D_ERR, "Error setting camera video mode!");
	return -EIO;
	}

	sd->current_mode = mode;

	return 0;
	}

	/* this function is called at probe time */
	static int sd_config(struct gspca_dev *gspca_dev,
	const struct usb_device_id *id)
	{
	int ret;
	struct sd sd = (struct sd ) gspca_dev;
	struct cam *cam = &gspca_dev->cam;

	/* Give the camera some time to settle, otherwise initalization will
	fail on hotplug, and yes it really needs a full second. */
	msleep(1000);

	/* ping camera to be sure STV0680 is present */
	if (stv_sndctrl(gspca_dev, 0, 0x88, 0x5678, 0x02) != 0x02 \|\|
	gspca_dev->usb_buf[0] != 0x56 \|\| gspca_dev->usb_buf[1] != 0x78) {
	PDEBUG(D_ERR, "STV(e): camera ping failed!!");
	return stv0680_handle_error(gspca_dev, -ENODEV);
	}

	/* get camera descriptor */
	if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0200, 0x09) != 0x09)
	return stv0680_handle_error(gspca_dev, -ENODEV);

	if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0200, 0x22) != 0x22 \|\|
	gspca_dev->usb_buf[7] != 0xa0 \|\| gspca_dev->usb_buf[8] != 0x23) {
	PDEBUG(D_ERR, "Could not get descriptor 0200.");
	return stv0680_handle_error(gspca_dev, -ENODEV);
	}
	if (stv_sndctrl(gspca_dev, 0, 0x8a, 0, 0x02) != 0x02)
	return stv0680_handle_error(gspca_dev, -ENODEV);
	if (stv_sndctrl(gspca_dev, 0, 0x8b, 0, 0x24) != 0x24)
	return stv0680_handle_error(gspca_dev, -ENODEV);
	if (stv_sndctrl(gspca_dev, 0, 0x85, 0, 0x10) != 0x10)
	return stv0680_handle_error(gspca_dev, -ENODEV);

	if (!(gspca_dev->usb_buf[7] & 0x09)) {
	PDEBUG(D_ERR, "Camera supports neither CIF nor QVGA mode");
	return -ENODEV;
	}
	if (gspca_dev->usb_buf[7] & 0x01)
	PDEBUG(D_PROBE, "Camera supports CIF mode");
	if (gspca_dev->usb_buf[7] & 0x02)
	PDEBUG(D_PROBE, "Camera supports VGA mode");
	if (gspca_dev->usb_buf[7] & 0x04)
	PDEBUG(D_PROBE, "Camera supports QCIF mode");
	if (gspca_dev->usb_buf[7] & 0x08)
	PDEBUG(D_PROBE, "Camera supports QVGA mode");

	if (gspca_dev->usb_buf[7] & 0x01)
	sd->video_mode = 0x00; /* CIF */
	else
	sd->video_mode = 0x03; /* QVGA */

	/* FW rev, ASIC rev, sensor ID */
	PDEBUG(D_PROBE, "Firmware rev is %i.%i",
	gspca_dev->usb_buf[0], gspca_dev->usb_buf[1]);
	PDEBUG(D_PROBE, "ASIC rev is %i.%i",
	gspca_dev->usb_buf[2], gspca_dev->usb_buf[3]);
	PDEBUG(D_PROBE, "Sensor ID is %i",
	(gspca_dev->usb_buf[4]*16) + (gspca_dev->usb_buf[5]>>4));


	ret = stv0680_get_video_mode(gspca_dev);
	if (ret < 0)
	return ret;
	sd->current_mode = sd->orig_mode = ret;

	ret = stv0680_set_video_mode(gspca_dev, sd->video_mode);
	if (ret < 0)
	return ret;

	/* Get mode details */
	if (stv_sndctrl(gspca_dev, 0, 0x8f, 0, 0x10) != 0x10)
	return stv0680_handle_error(gspca_dev, -EIO);

	cam->bulk = 1;
	cam->bulk_nurbs = 1; /* The cam cannot handle more */
	cam->bulk_size = (gspca_dev->usb_buf[0] << 24) \|
	(gspca_dev->usb_buf[1] << 16) \|
	(gspca_dev->usb_buf[2] << 8) \|
	(gspca_dev->usb_buf[3]);
	sd->mode.width = (gspca_dev->usb_buf[4] << 8) \|
	(gspca_dev->usb_buf[5]); /* 322, 356, 644 */
	sd->mode.height = (gspca_dev->usb_buf[6] << 8) \|
	(gspca_dev->usb_buf[7]); /* 242, 292, 484 */
	sd->mode.pixelformat = V4L2_PIX_FMT_STV0680;
	sd->mode.field = V4L2_FIELD_NONE;
	sd->mode.bytesperline = sd->mode.width;
	sd->mode.sizeimage = cam->bulk_size;
	sd->mode.colorspace = V4L2_COLORSPACE_SRGB;

	/* origGain = gspca_dev->usb_buf[12]; */

	cam->cam_mode = &sd->mode;
	cam->nmodes = 1;


	ret = stv0680_set_video_mode(gspca_dev, sd->orig_mode);
	if (ret < 0)
	return ret;

	if (stv_sndctrl(gspca_dev, 2, 0x06, 0x0100, 0x12) != 0x12 \|\|
	gspca_dev->usb_buf[8] != 0x53 \|\| gspca_dev->usb_buf[9] != 0x05) {
	pr_err("Could not get descriptor 0100\n");
	return stv0680_handle_error(gspca_dev, -EIO);
	}

	return 0;
	}

	/* this function is called at probe and resume time */
	static int sd_init(struct gspca_dev *gspca_dev)
	{
	return 0;
	}

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

	ret = stv0680_set_video_mode(gspca_dev, sd->video_mode);
	if (ret < 0)
	return ret;

	if (stv_sndctrl(gspca_dev, 0, 0x85, 0, 0x10) != 0x10)
	return stv0680_handle_error(gspca_dev, -EIO);

	/* Start stream at:
	0x0000 = CIF (352x288)
	0x0100 = VGA (640x480)
	0x0300 = QVGA (320x240) */
	if (stv_sndctrl(gspca_dev, 1, 0x09, sd->video_mode << 8, 0x0) != 0x0)
	return stv0680_handle_error(gspca_dev, -EIO);

	return 0;
	}

	static void sd_stopN(struct gspca_dev *gspca_dev)
	{
	/* This is a high priority command; it stops all lower order cmds */
	if (stv_sndctrl(gspca_dev, 1, 0x04, 0x0000, 0x0) != 0x0)
	stv0680_handle_error(gspca_dev, -EIO);
	}

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

	if (!sd->gspca_dev.present)
	return;

	stv0680_set_video_mode(gspca_dev, sd->orig_mode);
	}

	static void sd_pkt_scan(struct gspca_dev *gspca_dev,
	u8 *data,
	int len)
	{
	struct sd sd = (struct sd ) gspca_dev;

	/* Every now and then the camera sends a 16 byte packet, no idea
	what it contains, but it is not image data, when this
	happens the frame received before this packet is corrupt,
	so discard it. */
	if (len != sd->mode.sizeimage) {
	gspca_dev->last_packet_type = DISCARD_PACKET;
	return;
	}

	/* Finish the previous frame, we do this upon reception of the next
	packet, even though it is already complete so that the strange 16
	byte packets send after a corrupt frame can discard it. */
	gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);

	/* Store the just received frame */
	gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
	}

	/* sub-driver description */
	static const struct sd_desc sd_desc = {
	.name = MODULE_NAME,
	.config = sd_config,
	.init = sd_init,
	.start = sd_start,
	.stopN = sd_stopN,
	.stop0 = sd_stop0,
	.pkt_scan = sd_pkt_scan,
	};

	/* -- module initialisation -- */
	static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x0553, 0x0202)},
	{USB_DEVICE(0x041e, 0x4007)},
	{}
	};
	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);