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stv680.c

/*
 *  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 driver is based heavily on the
 * Endpoints (formerly known as AOX) se401 USB Camera Driver
 * Copyright (c) 2000 Jeroen B. Vreeken (pe1rxq@amsat.org)
 *
 * Still somewhat based on the Linux ov511 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * History:
 * ver 0.1 October, 2001. Initial attempt.
 *
 * ver 0.2 November, 2001. Fixed asbility to resize, added brightness
 *                         function, made more stable (?)
 *
 * ver 0.21 Nov, 2001.     Added gamma correction and white balance,
 *                         due to Alexander Schwartz. Still trying to
 *                         improve stablility. Moved stuff into stv680.h
 *
 * ver 0.22 Nov, 2001.     Added sharpen function (by Michael Sweet,
 *                         mike@easysw.com) from GIMP, also used in pencam.
 *                         Simple, fast, good integer math routine.
 *
 * ver 0.23 Dec, 2001 (gkh)
 *                   Took out sharpen function, ran code through
 *                   Lindent, and did other minor tweaks to get
 *                   things to work properly with 2.5.1
 *
 * ver 0.24 Jan, 2002 (kjs)
 *                         Fixed the problem with webcam crashing after
 *                         two pictures. Changed the way pic is halved to
 *                         improve quality. Got rid of green line around
 *                         frame. Fix brightness reset when changing size
 *                         bug. Adjusted gamma filters slightly.
 *
 * ver 0.25 Jan, 2002 (kjs)
 *                   Fixed a bug in which the driver sometimes attempted
 *                   to set to a non-supported size. This allowed
 *                   gnomemeeting to work.
 *                   Fixed proc entry removal bug.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/errno.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/usb.h>
#include <linux/mutex.h>

#include "stv680.h"

static int video_nr = -1;
static int swapRGB = 0;   /* default for auto sleect */
static int swapRGB_on = 0; /* default to allow auto select; -1=swap never, +1= swap always */

static unsigned int debug = 0;

#define PDEBUG(level, fmt, args...) \
      do { \
      if (debug >= level)     \
            info("[%s:%d] " fmt, __FUNCTION__, __LINE__ , ## args);     \
      } while (0)


/*
 * Version Information
 */
#define DRIVER_VERSION "v0.25"
#define DRIVER_AUTHOR "Kevin Sisson <kjsisson@bellsouth.net>"
#define DRIVER_DESC "STV0680 USB Camera Driver"

MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_DESCRIPTION (DRIVER_DESC);
MODULE_LICENSE ("GPL");
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC (debug, "Debug enabled or not");
module_param(swapRGB_on, int, 0);
MODULE_PARM_DESC (swapRGB_on, "Red/blue swap: 1=always, 0=auto, -1=never");
module_param(video_nr, int, 0);

/********************************************************************
 *
 * Memory management
 *
 * This is a shameless copy from the USB-cpia driver (linux kernel
 * version 2.3.29 or so, I have no idea what this code actually does ;).
 * Actually it seems to be a copy of a shameless copy of the bttv-driver.
 * Or that is a copy of a shameless copy of ... (To the powers: is there
 * no generic kernel-function to do this sort of stuff?)
 *
 * Yes, it was a shameless copy from the bttv-driver. IIRC, Alan says
 * there will be one, but apparentely not yet -jerdfelt
 *
 * So I copied it again for the ov511 driver -claudio
 *
 * Same for the se401 driver -Jeroen
 *
 * And the STV0680 driver - Kevin
 ********************************************************************/
static void *rvmalloc (unsigned long size)
{
      void *mem;
      unsigned long adr;

      size = PAGE_ALIGN(size);
      mem = vmalloc_32 (size);
      if (!mem)
            return NULL;

      memset (mem, 0, size);  /* Clear the ram out, no junk to the user */
      adr = (unsigned long) mem;
      while (size > 0) {
            SetPageReserved(vmalloc_to_page((void *)adr));
            adr += PAGE_SIZE;
            size -= PAGE_SIZE;
      }
      return mem;
}

static void rvfree (void *mem, unsigned long size)
{
      unsigned long adr;

      if (!mem)
            return;

      adr = (unsigned long) mem;
      while ((long) size > 0) {
            ClearPageReserved(vmalloc_to_page((void *)adr));
            adr += PAGE_SIZE;
            size -= PAGE_SIZE;
      }
      vfree (mem);
}


/*********************************************************************
 * pencam read/write functions
 ********************************************************************/

static int stv_sndctrl (int set, struct usb_stv *stv680, unsigned short req, unsigned short value, unsigned char *buffer, int size)
{
      int ret = -1;

      switch (set) {
      case 0:           /*  0xc1  */
            ret = usb_control_msg (stv680->udev,
                               usb_rcvctrlpipe (stv680->udev, 0),
                               req,
                               (USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT),
                               value, 0, buffer, size, PENCAM_TIMEOUT);
            break;

      case 1:           /*  0x41  */
            ret = usb_control_msg (stv680->udev,
                               usb_sndctrlpipe (stv680->udev, 0),
                               req,
                               (USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT),
                               value, 0, buffer, size, PENCAM_TIMEOUT);
            break;

      case 2:           /*  0x80  */
            ret = usb_control_msg (stv680->udev,
                               usb_rcvctrlpipe (stv680->udev, 0),
                               req,
                               (USB_DIR_IN | USB_RECIP_DEVICE),
                               value, 0, buffer, size, PENCAM_TIMEOUT);
            break;

      case 3:           /*  0x40  */
            ret = usb_control_msg (stv680->udev,
                               usb_sndctrlpipe (stv680->udev, 0),
                               req,
                               (USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE),
                               value, 0, buffer, size, PENCAM_TIMEOUT);
            break;

      }
      if ((ret < 0) && (req != 0x0a)) {
            PDEBUG (1, "STV(e): usb_control_msg error %i, request = 0x%x, error = %i", set, req, ret);
      }
      return ret;
}

static int stv_set_config (struct usb_stv *dev, int configuration, int interface, int alternate)
{

      if (configuration != dev->udev->actconfig->desc.bConfigurationValue
                  || usb_reset_configuration (dev->udev) < 0) {
            PDEBUG (1, "STV(e): FAILED to reset configuration %i", configuration);
            return -1;
      }
      if (usb_set_interface (dev->udev, interface, alternate) < 0) {
            PDEBUG (1, "STV(e): FAILED to set alternate interface %i", alternate);
            return -1;
      }
      return 0;
}

static int stv_stop_video (struct usb_stv *dev)
{
      int i;
      unsigned char *buf;

      buf = kmalloc (40, GFP_KERNEL);
      if (buf == NULL) {
            PDEBUG (0, "STV(e): Out of (small buf) memory");
            return -1;
      }

      /* this is a high priority command; it stops all lower order commands */
      if ((i = stv_sndctrl (1, dev, 0x04, 0x0000, buf, 0x0)) < 0) {
            i = stv_sndctrl (0, dev, 0x80, 0, buf, 0x02);   /* Get Last Error; 2 = busy */
            PDEBUG (1, "STV(i): last error: %i,  command = 0x%x", buf[0], buf[1]);
      } else {
            PDEBUG (1, "STV(i): Camera reset to idle mode.");
      }

      if ((i = stv_set_config (dev, 1, 0, 0)) < 0)
            PDEBUG (1, "STV(e): Reset config during exit failed");

      /*  get current mode  */
      buf[0] = 0xf0;
      if ((i = stv_sndctrl (0, dev, 0x87, 0, buf, 0x08)) != 0x08) /* get mode */
            PDEBUG (0, "STV(e): Stop_video: problem setting original mode");
      if (dev->origMode != buf[0]) {
            memset (buf, 0, 8);
            buf[0] = (unsigned char) dev->origMode;
            if ((i = stv_sndctrl (3, dev, 0x07, 0x0100, buf, 0x08)) != 0x08) {
                  PDEBUG (0, "STV(e): Stop_video: Set_Camera_Mode failed");
                  i = -1;
            }
            buf[0] = 0xf0;
            i = stv_sndctrl (0, dev, 0x87, 0, buf, 0x08);
            if ((i != 0x08) || (buf[0] != dev->origMode)) {
                  PDEBUG (0, "STV(e): camera NOT set to original resolution.");
                  i = -1;
            } else
                  PDEBUG (0, "STV(i): Camera set to original resolution");
      }
      /* origMode */
      kfree(buf);
      return i;
}

static int stv_set_video_mode (struct usb_stv *dev)
{
      int i, stop_video = 1;
      unsigned char *buf;

      buf = kmalloc (40, GFP_KERNEL);
      if (buf == NULL) {
            PDEBUG (0, "STV(e): Out of (small buf) memory");
            return -1;
      }

      if ((i = stv_set_config (dev, 1, 0, 0)) < 0) {
            kfree(buf);
            return i;
      }

      i = stv_sndctrl (2, dev, 0x06, 0x0100, buf, 0x12);
      if (!(i > 0) && (buf[8] == 0x53) && (buf[9] == 0x05)) {
            PDEBUG (1, "STV(e): Could not get descriptor 0100.");
            goto error;
      }

      /*  set alternate interface 1 */
      if ((i = stv_set_config (dev, 1, 0, 1)) < 0)
            goto error;

      if ((i = stv_sndctrl (0, dev, 0x85, 0, buf, 0x10)) != 0x10)
            goto error;
      PDEBUG (1, "STV(i): Setting video mode.");
      /*  Switch to Video mode: 0x0100 = VGA (640x480), 0x0000 = CIF (352x288) 0x0300 = QVGA (320x240)  */
      if ((i = stv_sndctrl (1, dev, 0x09, dev->VideoMode, buf, 0x0)) < 0) {
            stop_video = 0;
            goto error;
      }
      goto exit;

error:
      kfree(buf);
      if (stop_video == 1)
            stv_stop_video (dev);
      return -1;

exit:
      kfree(buf);
      return 0;
}

static int stv_init (struct usb_stv *stv680)
{
      int i = 0;
      unsigned char *buffer;
      unsigned long int bufsize;

      buffer = kzalloc (40, GFP_KERNEL);
      if (buffer == NULL) {
            PDEBUG (0, "STV(e): Out of (small buf) memory");
            return -1;
      }
      udelay (100);

      /* set config 1, interface 0, alternate 0 */
      if ((i = stv_set_config (stv680, 1, 0, 0)) < 0) {
            kfree(buffer);
            PDEBUG (0, "STV(e): set config 1,0,0 failed");
            return -1;
      }
      /* ping camera to be sure STV0680 is present */
      if ((i = stv_sndctrl (0, stv680, 0x88, 0x5678, buffer, 0x02)) != 0x02)
            goto error;
      if ((buffer[0] != 0x56) || (buffer[1] != 0x78)) {
            PDEBUG (1, "STV(e): camera ping failed!!");
            goto error;
      }

      /* get camera descriptor */
      if ((i = stv_sndctrl (2, stv680, 0x06, 0x0200, buffer, 0x09)) != 0x09)
            goto error;
      i = stv_sndctrl (2, stv680, 0x06, 0x0200, buffer, 0x22);
      if (!(i >= 0) && (buffer[7] == 0xa0) && (buffer[8] == 0x23)) {
            PDEBUG (1, "STV(e): Could not get descriptor 0200.");
            goto error;
      }
      if ((i = stv_sndctrl (0, stv680, 0x8a, 0, buffer, 0x02)) != 0x02)
            goto error;
      if ((i = stv_sndctrl (0, stv680, 0x8b, 0, buffer, 0x24)) != 0x24)
            goto error;
      if ((i = stv_sndctrl (0, stv680, 0x85, 0, buffer, 0x10)) != 0x10)
            goto error;

      stv680->SupportedModes = buffer[7];
      i = stv680->SupportedModes;
      stv680->CIF = 0;
      stv680->VGA = 0;
      stv680->QVGA = 0;
      if (i & 1)
            stv680->CIF = 1;
      if (i & 2)
            stv680->VGA = 1;
      if (i & 8)
            stv680->QVGA = 1;
      if (stv680->SupportedModes == 0) {
            PDEBUG (0, "STV(e): There are NO supported STV680 modes!!");
            i = -1;
            goto error;
      } else {
            if (stv680->CIF)
                  PDEBUG (0, "STV(i): CIF is supported");
            if (stv680->QVGA)
                  PDEBUG (0, "STV(i): QVGA is supported");
      }
      /* FW rev, ASIC rev, sensor ID  */
      PDEBUG (1, "STV(i): Firmware rev is %i.%i", buffer[0], buffer[1]);
      PDEBUG (1, "STV(i): ASIC rev is %i.%i", buffer[2], buffer[3]);
      PDEBUG (1, "STV(i): Sensor ID is %i", (buffer[4]*16) + (buffer[5]>>4));

      /*  set alternate interface 1 */
      if ((i = stv_set_config (stv680, 1, 0, 1)) < 0)
            goto error;

      if ((i = stv_sndctrl (0, stv680, 0x85, 0, buffer, 0x10)) != 0x10)
            goto error;
      if ((i = stv_sndctrl (0, stv680, 0x8d, 0, buffer, 0x08)) != 0x08)
            goto error;
      i = buffer[3];
      PDEBUG (0, "STV(i): Camera has %i pictures.", i);

      /*  get current mode */
      if ((i = stv_sndctrl (0, stv680, 0x87, 0, buffer, 0x08)) != 0x08)
            goto error;
      stv680->origMode = buffer[0]; /* 01 = VGA, 03 = QVGA, 00 = CIF */

      /* This will attemp CIF mode, if supported. If not, set to QVGA  */
      memset (buffer, 0, 8);
      if (stv680->CIF)
            buffer[0] = 0x00;
      else if (stv680->QVGA)
            buffer[0] = 0x03;
      if ((i = stv_sndctrl (3, stv680, 0x07, 0x0100, buffer, 0x08)) != 0x08) {
            PDEBUG (0, "STV(i): Set_Camera_Mode failed");
            i = -1;
            goto error;
      }
      buffer[0] = 0xf0;
      stv_sndctrl (0, stv680, 0x87, 0, buffer, 0x08);
      if (((stv680->CIF == 1) && (buffer[0] != 0x00)) || ((stv680->QVGA == 1) && (buffer[0] != 0x03))) {
            PDEBUG (0, "STV(e): Error setting camera video mode!");
            i = -1;
            goto error;
      } else {
            if (buffer[0] == 0) {
                  stv680->VideoMode = 0x0000;
                  PDEBUG (0, "STV(i): Video Mode set to CIF");
            }
            if (buffer[0] == 0x03) {
                  stv680->VideoMode = 0x0300;
                  PDEBUG (0, "STV(i): Video Mode set to QVGA");
            }
      }
      if ((i = stv_sndctrl (0, stv680, 0x8f, 0, buffer, 0x10)) != 0x10)
            goto error;
      bufsize = (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | (buffer[3]);
      stv680->cwidth = (buffer[4] << 8) | (buffer[5]);      /* ->camera = 322, 356, 644  */
      stv680->cheight = (buffer[6] << 8) | (buffer[7]);     /* ->camera = 242, 292, 484  */
      stv680->origGain = buffer[12];

      goto exit;

error:
      i = stv_sndctrl (0, stv680, 0x80, 0, buffer, 0x02);   /* Get Last Error */
      PDEBUG (1, "STV(i): last error: %i,  command = 0x%x", buffer[0], buffer[1]);
      kfree(buffer);
      return -1;

exit:
      kfree(buffer);

      /* video = 320x240, 352x288 */
      if (stv680->CIF == 1) {
            stv680->maxwidth = 352;
            stv680->maxheight = 288;
            stv680->vwidth = 352;
            stv680->vheight = 288;
      }
      if (stv680->QVGA == 1) {
            stv680->maxwidth = 320;
            stv680->maxheight = 240;
            stv680->vwidth = 320;
            stv680->vheight = 240;
      }

      stv680->rawbufsize = bufsize; /* must be ./. by 8 */
      stv680->maxframesize = bufsize * 3; /* RGB size */
      PDEBUG (2, "STV(i): cwidth = %i, cheight = %i", stv680->cwidth, stv680->cheight);
      PDEBUG (1, "STV(i): width = %i, height = %i, rawbufsize = %li", stv680->vwidth, stv680->vheight, stv680->rawbufsize);

      /* some default values */
      stv680->bulk_in_endpointAddr = 0x82;
      stv680->dropped = 0;
      stv680->error = 0;
      stv680->framecount = 0;
      stv680->readcount = 0;
      stv680->streaming = 0;
      /* bright, white, colour, hue, contrast are set by software, not in stv0680 */
      stv680->brightness = 32767;
      stv680->chgbright = 0;
      stv680->whiteness = 0;  /* only for greyscale */
      stv680->colour = 32767;
      stv680->contrast = 32767;
      stv680->hue = 32767;
      stv680->palette = STV_VIDEO_PALETTE;
      stv680->depth = 24;     /* rgb24 bits */
      if ((swapRGB_on == 0) && (swapRGB == 0))
            PDEBUG (1, "STV(i): swapRGB is (auto) OFF");
      else if ((swapRGB_on == 0) && (swapRGB == 1))
            PDEBUG (1, "STV(i): swapRGB is (auto) ON");
      else if (swapRGB_on == 1)
            PDEBUG (1, "STV(i): swapRGB is (forced) ON");
      else if (swapRGB_on == -1)
            PDEBUG (1, "STV(i): swapRGB is (forced) OFF");

      if (stv_set_video_mode (stv680) < 0) {
            PDEBUG (0, "STV(e): Could not set video mode in stv_init");
            return -1;
      }

      return 0;
}

/***************** last of pencam  routines  *******************/

/****************************************************************************
 *  sysfs
 ***************************************************************************/
#define stv680_file(name, variable, field)                        \
static ssize_t show_##name(struct device *class_dev,              \
                     struct device_attribute *attr, char *buf)    \
{                                                     \
      struct video_device *vdev = to_video_device(class_dev);           \
      struct usb_stv *stv = video_get_drvdata(vdev);              \
      return sprintf(buf, field, stv->variable);                  \
}                                                     \
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);

stv680_file(model, camera_name, "%s\n");
stv680_file(in_use, user, "%d\n");
stv680_file(streaming, streaming, "%d\n");
stv680_file(palette, palette, "%i\n");
stv680_file(frames_total, readcount, "%d\n");
stv680_file(frames_read, framecount, "%d\n");
stv680_file(packets_dropped, dropped, "%d\n");
stv680_file(decoding_errors, error, "%d\n");

static int stv680_create_sysfs_files(struct video_device *vdev)
{
      int rc;

      rc = video_device_create_file(vdev, &dev_attr_model);
      if (rc) goto err;
      rc = video_device_create_file(vdev, &dev_attr_in_use);
      if (rc) goto err_model;
      rc = video_device_create_file(vdev, &dev_attr_streaming);
      if (rc) goto err_inuse;
      rc = video_device_create_file(vdev, &dev_attr_palette);
      if (rc) goto err_stream;
      rc = video_device_create_file(vdev, &dev_attr_frames_total);
      if (rc) goto err_pal;
      rc = video_device_create_file(vdev, &dev_attr_frames_read);
      if (rc) goto err_framtot;
      rc = video_device_create_file(vdev, &dev_attr_packets_dropped);
      if (rc) goto err_framread;
      rc = video_device_create_file(vdev, &dev_attr_decoding_errors);
      if (rc) goto err_dropped;

      return 0;

err_dropped:
      video_device_remove_file(vdev, &dev_attr_packets_dropped);
err_framread:
      video_device_remove_file(vdev, &dev_attr_frames_read);
err_framtot:
      video_device_remove_file(vdev, &dev_attr_frames_total);
err_pal:
      video_device_remove_file(vdev, &dev_attr_palette);
err_stream:
      video_device_remove_file(vdev, &dev_attr_streaming);
err_inuse:
      video_device_remove_file(vdev, &dev_attr_in_use);
err_model:
      video_device_remove_file(vdev, &dev_attr_model);
err:
      return rc;
}

static void stv680_remove_sysfs_files(struct video_device *vdev)
{
      video_device_remove_file(vdev, &dev_attr_model);
      video_device_remove_file(vdev, &dev_attr_in_use);
      video_device_remove_file(vdev, &dev_attr_streaming);
      video_device_remove_file(vdev, &dev_attr_palette);
      video_device_remove_file(vdev, &dev_attr_frames_total);
      video_device_remove_file(vdev, &dev_attr_frames_read);
      video_device_remove_file(vdev, &dev_attr_packets_dropped);
      video_device_remove_file(vdev, &dev_attr_decoding_errors);
}

/********************************************************************
 * Camera control
 *******************************************************************/

static int stv680_get_pict (struct usb_stv *stv680, struct video_picture *p)
{
      /* This sets values for v4l interface. max/min = 65535/0  */

      p->brightness = stv680->brightness;
      p->whiteness = stv680->whiteness;   /* greyscale */
      p->colour = stv680->colour;
      p->contrast = stv680->contrast;
      p->hue = stv680->hue;
      p->palette = stv680->palette;
      p->depth = stv680->depth;
      return 0;
}

static int stv680_set_pict (struct usb_stv *stv680, struct video_picture *p)
{
      /* See above stv680_get_pict  */

      if (p->palette != STV_VIDEO_PALETTE) {
            PDEBUG (2, "STV(e): Palette set error in _set_pic");
            return 1;
      }

      if (stv680->brightness != p->brightness) {
            stv680->chgbright = 1;
            stv680->brightness = p->brightness;
      }

      stv680->whiteness = p->whiteness;   /* greyscale */
      stv680->colour = p->colour;
      stv680->contrast = p->contrast;
      stv680->hue = p->hue;
      stv680->palette = p->palette;
      stv680->depth = p->depth;

      return 0;
}

static void stv680_video_irq (struct urb *urb)
{
      struct usb_stv *stv680 = urb->context;
      int length = urb->actual_length;

      if (length < stv680->rawbufsize)
            PDEBUG (2, "STV(i): Lost data in transfer: exp %li, got %i", stv680->rawbufsize, length);

      /* ohoh... */
      if (!stv680->streaming)
            return;

      if (!stv680->udev) {
            PDEBUG (0, "STV(e): device vapourished in video_irq");
            return;
      }

      /* 0 sized packets happen if we are to fast, but sometimes the camera
         keeps sending them forever...
       */
      if (length && !urb->status) {
            stv680->nullpackets = 0;
            switch (stv680->scratch[stv680->scratch_next].state) {
            case BUFFER_READY:
            case BUFFER_BUSY:
                  stv680->dropped++;
                  break;

            case BUFFER_UNUSED:
                  memcpy (stv680->scratch[stv680->scratch_next].data,
                        (unsigned char *) urb->transfer_buffer, length);
                  stv680->scratch[stv680->scratch_next].state = BUFFER_READY;
                  stv680->scratch[stv680->scratch_next].length = length;
                  if (waitqueue_active (&stv680->wq)) {
                        wake_up_interruptible (&stv680->wq);
                  }
                  stv680->scratch_overflow = 0;
                  stv680->scratch_next++;
                  if (stv680->scratch_next >= STV680_NUMSCRATCH)
                        stv680->scratch_next = 0;
                  break;
            }           /* switch  */
      } else {
            stv680->nullpackets++;
            if (stv680->nullpackets > STV680_MAX_NULLPACKETS) {
                  if (waitqueue_active (&stv680->wq)) {
                        wake_up_interruptible (&stv680->wq);
                  }
            }
      }                 /*  if - else */

      /* Resubmit urb for new data */
      urb->status = 0;
      urb->dev = stv680->udev;
      if (usb_submit_urb (urb, GFP_ATOMIC))
            PDEBUG (0, "STV(e): urb burned down in video irq");
      return;
}                       /*  _video_irq  */

static int stv680_start_stream (struct usb_stv *stv680)
{
      struct urb *urb;
      int err = 0, i;

      stv680->streaming = 1;

      /* Do some memory allocation */
      for (i = 0; i < STV680_NUMFRAMES; i++) {
            stv680->frame[i].data = stv680->fbuf + i * stv680->maxframesize;
            stv680->frame[i].curpix = 0;
      }
      /* packet size = 4096  */
      for (i = 0; i < STV680_NUMSBUF; i++) {
            stv680->sbuf[i].data = kmalloc (stv680->rawbufsize, GFP_KERNEL);
            if (stv680->sbuf[i].data == NULL) {
                  PDEBUG (0, "STV(e): Could not kmalloc raw data buffer %i", i);
                  goto nomem_err;
            }
      }

      stv680->scratch_next = 0;
      stv680->scratch_use = 0;
      stv680->scratch_overflow = 0;
      for (i = 0; i < STV680_NUMSCRATCH; i++) {
            stv680->scratch[i].data = kmalloc (stv680->rawbufsize, GFP_KERNEL);
            if (stv680->scratch[i].data == NULL) {
                  PDEBUG (0, "STV(e): Could not kmalloc raw scratch buffer %i", i);
                  goto nomem_err;
            }
            stv680->scratch[i].state = BUFFER_UNUSED;
      }

      for (i = 0; i < STV680_NUMSBUF; i++) {
            urb = usb_alloc_urb (0, GFP_KERNEL);
            if (!urb)
                  goto nomem_err;

            /* sbuf is urb->transfer_buffer, later gets memcpyed to scratch */
            usb_fill_bulk_urb (urb, stv680->udev,
                           usb_rcvbulkpipe (stv680->udev, stv680->bulk_in_endpointAddr),
                           stv680->sbuf[i].data, stv680->rawbufsize,
                           stv680_video_irq, stv680);
            stv680->urb[i] = urb;
            err = usb_submit_urb (stv680->urb[i], GFP_KERNEL);
            if (err) {
                  PDEBUG (0, "STV(e): urb burned down with err "
                           "%d in start stream %d", err, i);
                  goto nomem_err;
            }
      }                 /* i STV680_NUMSBUF */

      stv680->framecount = 0;
      return 0;

 nomem_err:
      for (i = 0; i < STV680_NUMSCRATCH; i++) {
            kfree(stv680->scratch[i].data);
            stv680->scratch[i].data = NULL;
      }
      for (i = 0; i < STV680_NUMSBUF; i++) {
            usb_kill_urb(stv680->urb[i]);
            usb_free_urb(stv680->urb[i]);
            stv680->urb[i] = NULL;
            kfree(stv680->sbuf[i].data);
            stv680->sbuf[i].data = NULL;
      }
      return -ENOMEM;

}

static int stv680_stop_stream (struct usb_stv *stv680)
{
      int i;

      if (!stv680->streaming || !stv680->udev)
            return 1;

      stv680->streaming = 0;

      for (i = 0; i < STV680_NUMSBUF; i++)
            if (stv680->urb[i]) {
                  usb_kill_urb (stv680->urb[i]);
                  usb_free_urb (stv680->urb[i]);
                  stv680->urb[i] = NULL;
                  kfree(stv680->sbuf[i].data);
            }
      for (i = 0; i < STV680_NUMSCRATCH; i++) {
            kfree(stv680->scratch[i].data);
            stv680->scratch[i].data = NULL;
      }

      return 0;
}

static int stv680_set_size (struct usb_stv *stv680, int width, int height)
{
      int wasstreaming = stv680->streaming;

      /* Check to see if we need to change */
      if ((stv680->vwidth == width) && (stv680->vheight == height))
            return 0;

      PDEBUG (1, "STV(i): size request for %i x %i", width, height);
      /* Check for a valid mode */
      if ((!width || !height) || ((width & 1) || (height & 1))) {
            PDEBUG (1, "STV(e): set_size error: request: v.width = %i, v.height = %i  actual: stv.width = %i, stv.height = %i", width, height, stv680->vwidth, stv680->vheight);
            return 1;
      }

      if ((width < (stv680->maxwidth / 2)) || (height < (stv680->maxheight / 2))) {
            width = stv680->maxwidth / 2;
            height = stv680->maxheight / 2;
      } else if ((width >= 158) && (width <= 166) && (stv680->QVGA == 1)) {
            width = 160;
            height = 120;
      } else if ((width >= 172) && (width <= 180) && (stv680->CIF == 1)) {
            width = 176;
            height = 144;
      } else if ((width >= 318) && (width <= 350) && (stv680->QVGA == 1)) {
            width = 320;
            height = 240;
      } else if ((width >= 350) && (width <= 358) && (stv680->CIF == 1)) {
            width = 352;
            height = 288;
      } else {
            PDEBUG (1, "STV(e): request for non-supported size: request: v.width = %i, v.height = %i  actual: stv.width = %i, stv.height = %i", width, height, stv680->vwidth, stv680->vheight);
            return 1;
      }

      /* Stop a current stream and start it again at the new size */
      if (wasstreaming)
            stv680_stop_stream (stv680);
      stv680->vwidth = width;
      stv680->vheight = height;
      PDEBUG (1, "STV(i): size set to %i x %i", stv680->vwidth, stv680->vheight);
      if (wasstreaming)
            stv680_start_stream (stv680);

      return 0;
}

/**********************************************************************
 * Video Decoding
 **********************************************************************/

/*******  routines from the pencam program; hey, they work!  ********/

/*
 * STV0680 Vision Camera Chipset Driver
 * Copyright (C) 2000 Adam Harrison <adam@antispin.org>
*/

#define RED 0
#define GREEN 1
#define BLUE 2
#define AD(x, y, w) (((y)*(w)+(x))*3)

static void bayer_unshuffle (struct usb_stv *stv680, struct stv680_scratch *buffer)
{
      int x, y, i;
      int w = stv680->cwidth;
      int vw = stv680->cwidth, vh = stv680->cheight;
      unsigned int p = 0;
      int colour = 0, bayer = 0;
      unsigned char *raw = buffer->data;
      struct stv680_frame *frame = &stv680->frame[stv680->curframe];
      unsigned char *output = frame->data;
      unsigned char *temp = frame->data;
      int offset = buffer->offset;

      if (frame->curpix == 0) {
            if (frame->grabstate == FRAME_READY) {
                  frame->grabstate = FRAME_GRABBING;
            }
      }
      if (offset != frame->curpix) {      /* Regard frame as lost :( */
            frame->curpix = 0;
            stv680->error++;
            return;
      }

      if ((stv680->vwidth == 320) || (stv680->vwidth == 160)) {
            vw = 320;
            vh = 240;
      }
      if ((stv680->vwidth == 352) || (stv680->vwidth == 176)) {
            vw = 352;
            vh = 288;
      }

      memset (output, 0, 3 * vw * vh);    /* clear output matrix. */

      for (y = 0; y < vh; y++) {
            for (x = 0; x < vw; x++) {
                  if (x & 1)
                        p = *(raw + y * w + (x >> 1));
                  else
                        p = *(raw + y * w + (x >> 1) + (w >> 1));

                  if (y & 1)
                        bayer = 2;
                  else
                        bayer = 0;
                  if (x & 1)
                        bayer++;

                  switch (bayer) {
                  case 0:
                  case 3:
                        colour = 1;
                        break;
                  case 1:
                        colour = 0;
                        break;
                  case 2:
                        colour = 2;
                        break;
                  }
                  i = (y * vw + x) * 3;
                  *(output + i + colour) = (unsigned char) p;
            }           /* for x */

      }                 /* for y */

      /****** gamma correction plus hardcoded white balance */
      /* Thanks to Alexander Schwartx <alexander.schwartx@gmx.net> for this code.
         Correction values red[], green[], blue[], are generated by
         (pow(i/256.0, GAMMA)*255.0)*white balanceRGB where GAMMA=0.55, 1<i<255.
         White balance (RGB)= 1.0, 1.17, 1.48. Values are calculated as double float and
         converted to unsigned char. Values are in stv680.h  */

      for (y = 0; y < vh; y++) {
            for (x = 0; x < vw; x++) {
                  i = (y * vw + x) * 3;
                  *(output + i) = red[*(output + i)];
                  *(output + i + 1) = green[*(output + i + 1)];
                  *(output + i + 2) = blue[*(output + i + 2)];
            }
      }

      /******  bayer demosaic  ******/
      for (y = 1; y < (vh - 1); y++) {
            for (x = 1; x < (vw - 1); x++) {    /* work out pixel type */
                  if (y & 1)
                        bayer = 0;
                  else
                        bayer = 2;
                  if (!(x & 1))
                        bayer++;

                  switch (bayer) {
                  case 0:     /* green. blue lr, red tb */
                        *(output + AD (x, y, vw) + BLUE) = ((int) *(output + AD (x - 1, y, vw) + BLUE) + (int) *(output + AD (x + 1, y, vw) + BLUE)) >> 1;
                        *(output + AD (x, y, vw) + RED) = ((int) *(output + AD (x, y - 1, vw) + RED) + (int) *(output + AD (x, y + 1, vw) + RED)) >> 1;
                        break;

                  case 1:     /* blue. green lrtb, red diagonals */
                        *(output + AD (x, y, vw) + GREEN) = ((int) *(output + AD (x - 1, y, vw) + GREEN) + (int) *(output + AD (x + 1, y, vw) + GREEN) + (int) *(output + AD (x, y - 1, vw) + GREEN) + (int) *(output + AD (x, y + 1, vw) + GREEN)) >> 2;
                        *(output + AD (x, y, vw) + RED) = ((int) *(output + AD (x - 1, y - 1, vw) + RED) + (int) *(output + AD (x - 1, y + 1, vw) + RED) + (int) *(output + AD (x + 1, y - 1, vw) + RED) + (int) *(output + AD (x + 1, y + 1, vw) + RED)) >> 2;
                        break;

                  case 2:     /* red. green lrtb, blue diagonals */
                        *(output + AD (x, y, vw) + GREEN) = ((int) *(output + AD (x - 1, y, vw) + GREEN) + (int) *(output + AD (x + 1, y, vw) + GREEN) + (int) *(output + AD (x, y - 1, vw) + GREEN) + (int) *(output + AD (x, y + 1, vw) + GREEN)) >> 2;
                        *(output + AD (x, y, vw) + BLUE) = ((int) *(output + AD (x - 1, y - 1, vw) + BLUE) + (int) *(output + AD (x + 1, y - 1, vw) + BLUE) + (int) *(output + AD (x - 1, y + 1, vw) + BLUE) + (int) *(output + AD (x + 1, y + 1, vw) + BLUE)) >> 2;
                        break;

                  case 3:     /* green. red lr, blue tb */
                        *(output + AD (x, y, vw) + RED) = ((int) *(output + AD (x - 1, y, vw) + RED) + (int) *(output + AD (x + 1, y, vw) + RED)) >> 1;
                        *(output + AD (x, y, vw) + BLUE) = ((int) *(output + AD (x, y - 1, vw) + BLUE) + (int) *(output + AD (x, y + 1, vw) + BLUE)) >> 1;
                        break;
                  }     /* switch */
            }           /* for x */
      }                 /* for y  - end demosaic  */

      /* fix top and bottom row, left and right side */
      i = vw * 3;
      memcpy (output, (output + i), i);
      memcpy ((output + (vh * i)), (output + ((vh - 1) * i)), i);
      for (y = 0; y < vh; y++) {
            i = y * vw * 3;
            memcpy ((output + i), (output + i + 3), 3);
            memcpy ((output + i + (vw * 3)), (output + i + (vw - 1) * 3), 3);
      }

      /*  process all raw data, then trim to size if necessary */
      if ((stv680->vwidth == 160) || (stv680->vwidth == 176))  {
            i = 0;
            for (y = 0; y < vh; y++) {
                  if (!(y & 1)) {
                        for (x = 0; x < vw; x++) {
                              p = (y * vw + x) * 3;
                              if (!(x & 1)) {
                                    *(output + i) = *(output + p);
                                    *(output + i + 1) = *(output + p + 1);
                                    *(output + i + 2) = *(output + p + 2);
                                    i += 3;
                              }
                        }  /* for x */
                  }
            }  /* for y */
      }
      /* reset to proper width */
      if ((stv680->vwidth == 160)) {
            vw = 160;
            vh = 120;
      }
      if ((stv680->vwidth == 176)) {
            vw = 176;
            vh = 144;
      }

      /* output is RGB; some programs want BGR  */
      /* swapRGB_on=0 -> program decides;  swapRGB_on=1, always swap */
      /* swapRGB_on=-1, never swap */
      if (((swapRGB == 1) && (swapRGB_on != -1)) || (swapRGB_on == 1)) {
            for (y = 0; y < vh; y++) {
                  for (x = 0; x < vw; x++) {
                        i = (y * vw + x) * 3;
                        *(temp) = *(output + i);
                        *(output + i) = *(output + i + 2);
                        *(output + i + 2) = *(temp);
                  }
            }
      }
      /* brightness */
      if (stv680->chgbright == 1) {
            if (stv680->brightness >= 32767) {
                  p = (stv680->brightness - 32767) / 256;
                  for (x = 0; x < (vw * vh * 3); x++) {
                        if ((*(output + x) + (unsigned char) p) > 255)
                              *(output + x) = 255;
                        else
                              *(output + x) += (unsigned char) p;
                  }     /* for */
            } else {
                  p = (32767 - stv680->brightness) / 256;
                  for (x = 0; x < (vw * vh * 3); x++) {
                        if ((unsigned char) p > *(output + x))
                              *(output + x) = 0;
                        else
                              *(output + x) -= (unsigned char) p;
                  }     /* for */
            }           /* else */
      }
      /* if */
      frame->curpix = 0;
      frame->curlinepix = 0;
      frame->grabstate = FRAME_DONE;
      stv680->framecount++;
      stv680->readcount++;
      if (stv680->frame[(stv680->curframe + 1) & (STV680_NUMFRAMES - 1)].grabstate == FRAME_READY) {
            stv680->curframe = (stv680->curframe + 1) & (STV680_NUMFRAMES - 1);
      }

}                       /* bayer_unshuffle */

/*******  end routines from the pencam program  *********/

static int stv680_newframe (struct usb_stv *stv680, int framenr)
{
      int errors = 0;

      while (stv680->streaming && (stv680->frame[framenr].grabstate == FRAME_READY || stv680->frame[framenr].grabstate == FRAME_GRABBING)) {
            if (!stv680->frame[framenr].curpix) {
                  errors++;
            }
            wait_event_interruptible (stv680->wq, (stv680->scratch[stv680->scratch_use].state == BUFFER_READY));

            if (stv680->nullpackets > STV680_MAX_NULLPACKETS) {
                  stv680->nullpackets = 0;
                  PDEBUG (2, "STV(i): too many null length packets, restarting capture");
                  stv680_stop_stream (stv680);
                  stv680_start_stream (stv680);
            } else {
                  if (stv680->scratch[stv680->scratch_use].state != BUFFER_READY) {
                        stv680->frame[framenr].grabstate = FRAME_ERROR;
                        PDEBUG (2, "STV(e): FRAME_ERROR in _newframe");
                        return -EIO;
                  }
                  stv680->scratch[stv680->scratch_use].state = BUFFER_BUSY;

                  bayer_unshuffle (stv680, &stv680->scratch[stv680->scratch_use]);

                  stv680->scratch[stv680->scratch_use].state = BUFFER_UNUSED;
                  stv680->scratch_use++;
                  if (stv680->scratch_use >= STV680_NUMSCRATCH)
                        stv680->scratch_use = 0;
                  if (errors > STV680_MAX_ERRORS) {
                        errors = 0;
                        PDEBUG (2, "STV(i): too many errors, restarting capture");
                        stv680_stop_stream (stv680);
                        stv680_start_stream (stv680);
                  }
            }           /* else */
      }                 /* while */
      return 0;
}

/*********************************************************************
 * Video4Linux
 *********************************************************************/

static int stv_open (struct inode *inode, struct file *file)
{
      struct video_device *dev = video_devdata(file);
      struct usb_stv *stv680 = video_get_drvdata(dev);
      int err = 0;

      /* we are called with the BKL held */
      stv680->user = 1;
      err = stv_init (stv680);      /* main initialization routine for camera */

      if (err >= 0) {
            stv680->fbuf = rvmalloc (stv680->maxframesize * STV680_NUMFRAMES);
            if (!stv680->fbuf) {
                  PDEBUG (0, "STV(e): Could not rvmalloc frame bufer");
                  err = -ENOMEM;
            }
            file->private_data = dev;
      }
      if (err)
            stv680->user = 0;

      return err;
}

static int stv_close (struct inode *inode, struct file *file)
{
      struct video_device *dev = file->private_data;
      struct usb_stv *stv680 = video_get_drvdata(dev);
      int i;

      for (i = 0; i < STV680_NUMFRAMES; i++)
            stv680->frame[i].grabstate = FRAME_UNUSED;
      if (stv680->streaming)
            stv680_stop_stream (stv680);

      if ((i = stv_stop_video (stv680)) < 0)
            PDEBUG (1, "STV(e): stop_video failed in stv_close");

      rvfree (stv680->fbuf, stv680->maxframesize * STV680_NUMFRAMES);
      stv680->user = 0;

      if (stv680->removed) {
            kfree(stv680);
            stv680 = NULL;
            PDEBUG (0, "STV(i): device unregistered");
      }
      file->private_data = NULL;
      return 0;
}

static int stv680_do_ioctl (struct inode *inode, struct file *file,
                      unsigned int cmd, void *arg)
{
      struct video_device *vdev = file->private_data;
      struct usb_stv *stv680 = video_get_drvdata(vdev);

      if (!stv680->udev)
            return -EIO;

      switch (cmd) {
      case VIDIOCGCAP:{
                  struct video_capability *b = arg;

                  strcpy (b->name, stv680->camera_name);
                  b->type = VID_TYPE_CAPTURE;
                  b->channels = 1;
                  b->audios = 0;
                  b->maxwidth = stv680->maxwidth;
                  b->maxheight = stv680->maxheight;
                  b->minwidth = stv680->maxwidth / 2;
                  b->minheight = stv680->maxheight / 2;
                  return 0;
            }
      case VIDIOCGCHAN:{
                  struct video_channel *v = arg;

                  if (v->channel != 0)
                        return -EINVAL;
                  v->flags = 0;
                  v->tuners = 0;
                  v->type = VIDEO_TYPE_CAMERA;
                  strcpy (v->name, "STV Camera");
                  return 0;
            }
      case VIDIOCSCHAN:{
                  struct video_channel *v = arg;
                  if (v->channel != 0)
                        return -EINVAL;
                  return 0;
            }
      case VIDIOCGPICT:{
                  struct video_picture *p = arg;

                  stv680_get_pict (stv680, p);
                  return 0;
            }
      case VIDIOCSPICT:{
                  struct video_picture *p = arg;

                  if (stv680_set_pict (stv680, p))
                        return -EINVAL;
                  return 0;
            }
      case VIDIOCSWIN:{
                  struct video_window *vw = arg;

                  if (vw->flags)
                        return -EINVAL;
                  if (vw->clipcount)
                        return -EINVAL;
                  if (vw->width != stv680->vwidth) {
                        if (stv680_set_size (stv680, vw->width, vw->height)) {
                              PDEBUG (2, "STV(e): failed (from user) set size in VIDIOCSWIN");
                              return -EINVAL;
                        }
                  }
                  return 0;
            }
      case VIDIOCGWIN:{
                  struct video_window *vw = arg;

                  vw->x = 0;  /* FIXME */
                  vw->y = 0;
                  vw->chromakey = 0;
                  vw->flags = 0;
                  vw->clipcount = 0;
                  vw->width = stv680->vwidth;
                  vw->height = stv680->vheight;
                  return 0;
            }
      case VIDIOCGMBUF:{
                  struct video_mbuf *vm = arg;
                  int i;

                  memset (vm, 0, sizeof (*vm));
                  vm->size = STV680_NUMFRAMES * stv680->maxframesize;
                  vm->frames = STV680_NUMFRAMES;
                  for (i = 0; i < STV680_NUMFRAMES; i++)
                        vm->offsets[i] = stv680->maxframesize * i;
                  return 0;
            }
      case VIDIOCMCAPTURE:{
                  struct video_mmap *vm = arg;

                  if (vm->format != STV_VIDEO_PALETTE) {
                        PDEBUG (2, "STV(i): VIDIOCMCAPTURE vm.format (%i) != VIDEO_PALETTE (%i)",
                              vm->format, STV_VIDEO_PALETTE);
                        if ((vm->format == 3) && (swapRGB_on == 0))  {
                              PDEBUG (2, "STV(i): VIDIOCMCAPTURE swapRGB is (auto) ON");
                              /* this may fix those apps (e.g., xawtv) that want BGR */
                              swapRGB = 1;
                        }
                        return -EINVAL;
                  }
                  if (vm->frame >= STV680_NUMFRAMES) {
                        PDEBUG (2, "STV(e): VIDIOCMCAPTURE vm.frame > NUMFRAMES");
                        return -EINVAL;
                  }
                  if ((stv680->frame[vm->frame].grabstate == FRAME_ERROR)
                      || (stv680->frame[vm->frame].grabstate == FRAME_GRABBING)) {
                        PDEBUG (2, "STV(e): VIDIOCMCAPTURE grabstate (%i) error",
                              stv680->frame[vm->frame].grabstate);
                        return -EBUSY;
                  }
                  /* Is this according to the v4l spec??? */
                  if (stv680->vwidth != vm->width) {
                        if (stv680_set_size (stv680, vm->width, vm->height)) {
                              PDEBUG (2, "STV(e): VIDIOCMCAPTURE set_size failed");
                              return -EINVAL;
                        }
                  }
                  stv680->frame[vm->frame].grabstate = FRAME_READY;

                  if (!stv680->streaming)
                        stv680_start_stream (stv680);

                  return 0;
            }
      case VIDIOCSYNC:{
                  int *frame = arg;
                  int ret = 0;

                  if (*frame < 0 || *frame >= STV680_NUMFRAMES) {
                        PDEBUG (2, "STV(e): Bad frame # in VIDIOCSYNC");
                        return -EINVAL;
                  }
                  ret = stv680_newframe (stv680, *frame);
                  stv680->frame[*frame].grabstate = FRAME_UNUSED;
                  return ret;
            }
      case VIDIOCGFBUF:{
                  struct video_buffer *vb = arg;

                  memset (vb, 0, sizeof (*vb));
                  return 0;
            }
      case VIDIOCKEY:
            return 0;
      case VIDIOCCAPTURE:
            {
                  PDEBUG (2, "STV(e): VIDIOCCAPTURE failed");
                  return -EINVAL;
            }
      case VIDIOCSFBUF:
      case VIDIOCGTUNER:
      case VIDIOCSTUNER:
      case VIDIOCGFREQ:
      case VIDIOCSFREQ:
      case VIDIOCGAUDIO:
      case VIDIOCSAUDIO:
            return -EINVAL;
      default:
            return -ENOIOCTLCMD;
      }                 /* end switch */

      return 0;
}

static int stv680_ioctl(struct inode *inode, struct file *file,
                  unsigned int cmd, unsigned long arg)
{
      return video_usercopy(inode, file, cmd, arg, stv680_do_ioctl);
}

static int stv680_mmap (struct file *file, struct vm_area_struct *vma)
{
      struct video_device *dev = file->private_data;
      struct usb_stv *stv680 = video_get_drvdata(dev);
      unsigned long start = vma->vm_start;
      unsigned long size  = vma->vm_end-vma->vm_start;
      unsigned long page, pos;

      mutex_lock(&stv680->lock);

      if (stv680->udev == NULL) {
            mutex_unlock(&stv680->lock);
            return -EIO;
      }
      if (size > (((STV680_NUMFRAMES * stv680->maxframesize) + PAGE_SIZE - 1)
                & ~(PAGE_SIZE - 1))) {
            mutex_unlock(&stv680->lock);
            return -EINVAL;
      }
      pos = (unsigned long) stv680->fbuf;
      while (size > 0) {
            page = vmalloc_to_pfn((void *)pos);
            if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {
                  mutex_unlock(&stv680->lock);
                  return -EAGAIN;
            }
            start += PAGE_SIZE;
            pos += PAGE_SIZE;
            if (size > PAGE_SIZE)
                  size -= PAGE_SIZE;
            else
                  size = 0;
      }
      mutex_unlock(&stv680->lock);

      return 0;
}

static ssize_t stv680_read (struct file *file, char __user *buf,
                  size_t count, loff_t *ppos)
{
      struct video_device *dev = file->private_data;
      unsigned long int realcount = count;
      int ret = 0;
      struct usb_stv *stv680 = video_get_drvdata(dev);
      unsigned long int i;

      if (STV680_NUMFRAMES != 2) {
            PDEBUG (0, "STV(e): STV680_NUMFRAMES needs to be 2!");
            return -1;
      }
      if (stv680->udev == NULL)
            return -EIO;
      if (realcount > (stv680->vwidth * stv680->vheight * 3))
            realcount = stv680->vwidth * stv680->vheight * 3;

      /* Shouldn't happen: */
      if (stv680->frame[0].grabstate == FRAME_GRABBING) {
            PDEBUG (2, "STV(e): FRAME_GRABBING in stv680_read");
            return -EBUSY;
      }
      stv680->frame[0].grabstate = FRAME_READY;
      stv680->frame[1].grabstate = FRAME_UNUSED;
      stv680->curframe = 0;

      if (!stv680->streaming)
            stv680_start_stream (stv680);

      if (!stv680->streaming) {
            ret = stv680_newframe (stv680, 0);  /* ret should = 0 */
      }

      ret = stv680_newframe (stv680, 0);

      if (!ret) {
            if ((i = copy_to_user (buf, stv680->frame[0].data, realcount)) != 0) {
                  PDEBUG (2, "STV(e): copy_to_user frame 0 failed, ret count = %li", i);
                  return -EFAULT;
            }
      } else {
            realcount = ret;
      }
      stv680->frame[0].grabstate = FRAME_UNUSED;
      return realcount;
}                       /* stv680_read */

static const struct file_operations stv680_fops = {
      .owner =    THIS_MODULE,
      .open =           stv_open,
      .release =        stv_close,
      .read =           stv680_read,
      .mmap =           stv680_mmap,
      .ioctl =        stv680_ioctl,
      .compat_ioctl = v4l_compat_ioctl32,
      .llseek =       no_llseek,
};
static struct video_device stv680_template = {
      .owner =    THIS_MODULE,
      .name =           "STV0680 USB camera",
      .type =           VID_TYPE_CAPTURE,
      .fops =         &stv680_fops,
      .release =  video_device_release,
      .minor =    -1,
};

static int stv680_probe (struct usb_interface *intf, const struct usb_device_id *id)
{
      struct usb_device *dev = interface_to_usbdev(intf);
      struct usb_host_interface *interface;
      struct usb_stv *stv680 = NULL;
      char *camera_name = NULL;
      int retval = 0;

      /* We don't handle multi-config cameras */
      if (dev->descriptor.bNumConfigurations != 1) {
            PDEBUG (0, "STV(e): Number of Configurations != 1");
            return -ENODEV;
      }

      interface = &intf->altsetting[0];
      /* Is it a STV680? */
      if ((le16_to_cpu(dev->descriptor.idVendor) == USB_PENCAM_VENDOR_ID) &&
          (le16_to_cpu(dev->descriptor.idProduct) == USB_PENCAM_PRODUCT_ID)) {
            camera_name = "STV0680";
            PDEBUG (0, "STV(i): STV0680 camera found.");
      } else if ((le16_to_cpu(dev->descriptor.idVendor) == USB_CREATIVEGOMINI_VENDOR_ID) &&
               (le16_to_cpu(dev->descriptor.idProduct) == USB_CREATIVEGOMINI_PRODUCT_ID)) {
            camera_name = "Creative WebCam Go Mini";
            PDEBUG (0, "STV(i): Creative WebCam Go Mini found.");
      } else {
            PDEBUG (0, "STV(e): Vendor/Product ID do not match STV0680 or Creative WebCam Go Mini values.");
            PDEBUG (0, "STV(e): Check that the STV0680 or Creative WebCam Go Mini camera is connected to the computer.");
            retval = -ENODEV;
            goto error;
      }
      /* We found one */
      if ((stv680 = kzalloc (sizeof (*stv680), GFP_KERNEL)) == NULL) {
            PDEBUG (0, "STV(e): couldn't kmalloc stv680 struct.");
            retval = -ENOMEM;
            goto error;
      }

      stv680->udev = dev;
      stv680->camera_name = camera_name;

      stv680->vdev = video_device_alloc();
      if (!stv680->vdev) {
            retval = -ENOMEM;
            goto error;
      }
      memcpy(stv680->vdev, &stv680_template, sizeof(stv680_template));
      stv680->vdev->dev = &intf->dev;
      video_set_drvdata(stv680->vdev, stv680);

      memcpy (stv680->vdev->name, stv680->camera_name, strlen (stv680->camera_name));
      init_waitqueue_head (&stv680->wq);
      mutex_init (&stv680->lock);
      wmb ();

      if (video_register_device (stv680->vdev, VFL_TYPE_GRABBER, video_nr) == -1) {
            PDEBUG (0, "STV(e): video_register_device failed");
            retval = -EIO;
            goto error_vdev;
      }
      PDEBUG (0, "STV(i): registered new video device: video%d", stv680->vdev->minor);

      usb_set_intfdata (intf, stv680);
      retval = stv680_create_sysfs_files(stv680->vdev);
      if (retval)
            goto error_unreg;
      return 0;

error_unreg:
      video_unregister_device(stv680->vdev);
error_vdev:
      video_device_release(stv680->vdev);
error:
      kfree(stv680);
      return retval;
}

static inline void usb_stv680_remove_disconnected (struct usb_stv *stv680)
{
      int i;

      stv680->udev = NULL;
      stv680->frame[0].grabstate = FRAME_ERROR;
      stv680->frame[1].grabstate = FRAME_ERROR;
      stv680->streaming = 0;

      wake_up_interruptible (&stv680->wq);

      for (i = 0; i < STV680_NUMSBUF; i++)
            if (stv680->urb[i]) {
                  usb_kill_urb (stv680->urb[i]);
                  usb_free_urb (stv680->urb[i]);
                  stv680->urb[i] = NULL;
                  kfree(stv680->sbuf[i].data);
            }
      for (i = 0; i < STV680_NUMSCRATCH; i++)
            kfree(stv680->scratch[i].data);
      PDEBUG (0, "STV(i): %s disconnected", stv680->camera_name);

      /* Free the memory */
      kfree(stv680);
}

static void stv680_disconnect (struct usb_interface *intf)
{
      struct usb_stv *stv680 = usb_get_intfdata (intf);

      usb_set_intfdata (intf, NULL);

      if (stv680) {
            /* We don't want people trying to open up the device */
            if (stv680->vdev) {
                  stv680_remove_sysfs_files(stv680->vdev);
                  video_unregister_device(stv680->vdev);
                  stv680->vdev = NULL;
            }
            if (!stv680->user) {
                  usb_stv680_remove_disconnected (stv680);
            } else {
                  stv680->removed = 1;
            }
      }
}

static struct usb_driver stv680_driver = {
      .name =           "stv680",
      .probe =    stv680_probe,
      .disconnect =     stv680_disconnect,
      .id_table = device_table
};

/********************************************************************
 *  Module routines
 ********************************************************************/

static int __init usb_stv680_init (void)
{
      if (usb_register (&stv680_driver) < 0) {
            PDEBUG (0, "STV(e): Could not setup STV0680 driver");
            return -1;
      }
      PDEBUG (0, "STV(i): usb camera driver version %s registering", DRIVER_VERSION);

      info(DRIVER_DESC " " DRIVER_VERSION);
      return 0;
}

static void __exit usb_stv680_exit (void)
{
      usb_deregister (&stv680_driver);
      PDEBUG (0, "STV(i): driver deregistered");
}

module_init (usb_stv680_init);
module_exit (usb_stv680_exit);

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