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c-qcam.c

/*
 *    Video4Linux Colour QuickCam driver
 *    Copyright 1997-2000 Philip Blundell <philb@gnu.org>
 *
 *    Module parameters:
 *
 *    parport=auto      -- probe all parports (default)
 *    parport=0         -- parport0 becomes qcam1
 *    parport=2,0,1     -- parports 2,0,1 are tried in that order
 *
 *    probe=0             -- do no probing, assume camera is present
 *    probe=1             -- use IEEE-1284 autoprobe data only (default)
 *    probe=2             -- probe aggressively for cameras
 *
 *    force_rgb=1       -- force data format to RGB (default is BGR)
 *
 * The parport parameter controls which parports will be scanned.
 * Scanning all parports causes some printers to print a garbage page.
 *       -- March 14, 1999  Billy Donahue <billy@escape.com>
 *
 * Fixed data format to BGR, added force_rgb parameter. Added missing
 * parport_unregister_driver() on module removal.
 *       -- May 28, 2000  Claudio Matsuoka <claudio@conectiva.com>
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/parport.h>
#include <linux/sched.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/mutex.h>

#include <asm/uaccess.h>

struct qcam_device {
      struct video_device vdev;
      struct pardevice *pdev;
      struct parport *pport;
      int width, height;
      int ccd_width, ccd_height;
      int mode;
      int contrast, brightness, whitebal;
      int top, left;
      unsigned int bidirectional;
      struct mutex lock;
};

/* cameras maximum */
#define MAX_CAMS 4

/* The three possible QuickCam modes */
#define QC_MILLIONS     0x18
#define QC_BILLIONS     0x10
#define QC_THOUSANDS    0x08  /* with VIDEC compression (not supported) */

/* The three possible decimations */
#define QC_DECIMATION_1       0
#define QC_DECIMATION_2       2
#define QC_DECIMATION_4       4

#define BANNER "Colour QuickCam for Video4Linux v0.05"

static int parport[MAX_CAMS] = { [1 ... MAX_CAMS-1] = -1 };
static int probe = 2;
static int force_rgb = 0;
static int video_nr = -1;

static inline void qcam_set_ack(struct qcam_device *qcam, unsigned int i)
{
      /* note: the QC specs refer to the PCAck pin by voltage, not
         software level.  PC ports have builtin inverters. */
      parport_frob_control(qcam->pport, 8, i?8:0);
}

static inline unsigned int qcam_ready1(struct qcam_device *qcam)
{
      return (parport_read_status(qcam->pport) & 0x8)?1:0;
}

static inline unsigned int qcam_ready2(struct qcam_device *qcam)
{
      return (parport_read_data(qcam->pport) & 0x1)?1:0;
}

static unsigned int qcam_await_ready1(struct qcam_device *qcam,
                                   int value)
{
      unsigned long oldjiffies = jiffies;
      unsigned int i;

      for (oldjiffies = jiffies; (jiffies - oldjiffies) < msecs_to_jiffies(40); )
            if (qcam_ready1(qcam) == value)
                  return 0;

      /* If the camera didn't respond within 1/25 second, poll slowly
         for a while. */
      for (i = 0; i < 50; i++)
      {
            if (qcam_ready1(qcam) == value)
                  return 0;
            msleep_interruptible(100);
      }

      /* Probably somebody pulled the plug out.  Not much we can do. */
      printk(KERN_ERR "c-qcam: ready1 timeout (%d) %x %x\n", value,
             parport_read_status(qcam->pport),
             parport_read_control(qcam->pport));
      return 1;
}

static unsigned int qcam_await_ready2(struct qcam_device *qcam, int value)
{
      unsigned long oldjiffies = jiffies;
      unsigned int i;

      for (oldjiffies = jiffies; (jiffies - oldjiffies) < msecs_to_jiffies(40); )
            if (qcam_ready2(qcam) == value)
                  return 0;

      /* If the camera didn't respond within 1/25 second, poll slowly
         for a while. */
      for (i = 0; i < 50; i++)
      {
            if (qcam_ready2(qcam) == value)
                  return 0;
            msleep_interruptible(100);
      }

      /* Probably somebody pulled the plug out.  Not much we can do. */
      printk(KERN_ERR "c-qcam: ready2 timeout (%d) %x %x %x\n", value,
             parport_read_status(qcam->pport),
             parport_read_control(qcam->pport),
             parport_read_data(qcam->pport));
      return 1;
}

static int qcam_read_data(struct qcam_device *qcam)
{
      unsigned int idata;
      qcam_set_ack(qcam, 0);
      if (qcam_await_ready1(qcam, 1)) return -1;
      idata = parport_read_status(qcam->pport) & 0xf0;
      qcam_set_ack(qcam, 1);
      if (qcam_await_ready1(qcam, 0)) return -1;
      idata |= (parport_read_status(qcam->pport) >> 4);
      return idata;
}

static int qcam_write_data(struct qcam_device *qcam, unsigned int data)
{
      unsigned int idata;
      parport_write_data(qcam->pport, data);
      idata = qcam_read_data(qcam);
      if (data != idata)
      {
            printk(KERN_WARNING "cqcam: sent %x but received %x\n", data,
                   idata);
            return 1;
      }
      return 0;
}

static inline int qcam_set(struct qcam_device *qcam, unsigned int cmd, unsigned int data)
{
      if (qcam_write_data(qcam, cmd))
            return -1;
      if (qcam_write_data(qcam, data))
            return -1;
      return 0;
}

static inline int qcam_get(struct qcam_device *qcam, unsigned int cmd)
{
      if (qcam_write_data(qcam, cmd))
            return -1;
      return qcam_read_data(qcam);
}

static int qc_detect(struct qcam_device *qcam)
{
      unsigned int stat, ostat, i, count = 0;

      /* The probe routine below is not very reliable.  The IEEE-1284
         probe takes precedence. */
      /* XXX Currently parport provides no way to distinguish between
         "the IEEE probe was not done" and "the probe was done, but
         no device was found".  Fix this one day. */
      if (qcam->pport->probe_info[0].class == PARPORT_CLASS_MEDIA
          && qcam->pport->probe_info[0].model
          && !strcmp(qcam->pdev->port->probe_info[0].model,
                   "Color QuickCam 2.0")) {
            printk(KERN_DEBUG "QuickCam: Found by IEEE1284 probe.\n");
            return 1;
      }

      if (probe < 2)
            return 0;

      parport_write_control(qcam->pport, 0xc);

      /* look for a heartbeat */
      ostat = stat = parport_read_status(qcam->pport);
      for (i=0; i<250; i++)
      {
            mdelay(1);
            stat = parport_read_status(qcam->pport);
            if (ostat != stat)
            {
                  if (++count >= 3) return 1;
                  ostat = stat;
            }
      }

      /* Reset the camera and try again */
      parport_write_control(qcam->pport, 0xc);
      parport_write_control(qcam->pport, 0x8);
      mdelay(1);
      parport_write_control(qcam->pport, 0xc);
      mdelay(1);
      count = 0;

      ostat = stat = parport_read_status(qcam->pport);
      for (i=0; i<250; i++)
      {
            mdelay(1);
            stat = parport_read_status(qcam->pport);
            if (ostat != stat)
            {
                  if (++count >= 3) return 1;
                  ostat = stat;
            }
      }

      /* no (or flatline) camera, give up */
      return 0;
}

static void qc_reset(struct qcam_device *qcam)
{
      parport_write_control(qcam->pport, 0xc);
      parport_write_control(qcam->pport, 0x8);
      mdelay(1);
      parport_write_control(qcam->pport, 0xc);
      mdelay(1);
}

/* Reset the QuickCam and program for brightness, contrast,
 * white-balance, and resolution. */

static void qc_setup(struct qcam_device *q)
{
      qc_reset(q);

      /* Set the brightness.  */
      qcam_set(q, 11, q->brightness);

      /* Set the height and width.  These refer to the actual
         CCD area *before* applying the selected decimation.  */
      qcam_set(q, 17, q->ccd_height);
      qcam_set(q, 19, q->ccd_width / 2);

      /* Set top and left.  */
      qcam_set(q, 0xd, q->top);
      qcam_set(q, 0xf, q->left);

      /* Set contrast and white balance.  */
      qcam_set(q, 0x19, q->contrast);
      qcam_set(q, 0x1f, q->whitebal);

      /* Set the speed.  */
      qcam_set(q, 45, 2);
}

/* Read some bytes from the camera and put them in the buffer.
   nbytes should be a multiple of 3, because bidirectional mode gives
   us three bytes at a time.  */

static unsigned int qcam_read_bytes(struct qcam_device *q, unsigned char *buf, unsigned int nbytes)
{
      unsigned int bytes = 0;

      qcam_set_ack(q, 0);
      if (q->bidirectional)
      {
            /* It's a bidirectional port */
            while (bytes < nbytes)
            {
                  unsigned int lo1, hi1, lo2, hi2;
                  unsigned char r, g, b;

                  if (qcam_await_ready2(q, 1)) return bytes;
                  lo1 = parport_read_data(q->pport) >> 1;
                  hi1 = ((parport_read_status(q->pport) >> 3) & 0x1f) ^ 0x10;
                  qcam_set_ack(q, 1);
                  if (qcam_await_ready2(q, 0)) return bytes;
                  lo2 = parport_read_data(q->pport) >> 1;
                  hi2 = ((parport_read_status(q->pport) >> 3) & 0x1f) ^ 0x10;
                  qcam_set_ack(q, 0);
                  r = (lo1 | ((hi1 & 1)<<7));
                  g = ((hi1 & 0x1e)<<3) | ((hi2 & 0x1e)>>1);
                  b = (lo2 | ((hi2 & 1)<<7));
                  if (force_rgb) {
                        buf[bytes++] = r;
                        buf[bytes++] = g;
                        buf[bytes++] = b;
                  } else {
                        buf[bytes++] = b;
                        buf[bytes++] = g;
                        buf[bytes++] = r;
                  }
            }
      }
      else
      {
            /* It's a unidirectional port */
            int i = 0, n = bytes;
            unsigned char rgb[3];

            while (bytes < nbytes)
            {
                  unsigned int hi, lo;

                  if (qcam_await_ready1(q, 1)) return bytes;
                  hi = (parport_read_status(q->pport) & 0xf0);
                  qcam_set_ack(q, 1);
                  if (qcam_await_ready1(q, 0)) return bytes;
                  lo = (parport_read_status(q->pport) & 0xf0);
                  qcam_set_ack(q, 0);
                  /* flip some bits */
                  rgb[(i = bytes++ % 3)] = (hi | (lo >> 4)) ^ 0x88;
                  if (i >= 2) {
get_fragment:
                        if (force_rgb) {
                              buf[n++] = rgb[0];
                              buf[n++] = rgb[1];
                              buf[n++] = rgb[2];
                        } else {
                              buf[n++] = rgb[2];
                              buf[n++] = rgb[1];
                              buf[n++] = rgb[0];
                        }
                  }
            }
            if (i) {
                  i = 0;
                  goto get_fragment;
            }
      }
      return bytes;
}

#define BUFSZ     150

static long qc_capture(struct qcam_device *q, char __user *buf, unsigned long len)
{
      unsigned lines, pixelsperline, bitsperxfer;
      unsigned int is_bi_dir = q->bidirectional;
      size_t wantlen, outptr = 0;
      char tmpbuf[BUFSZ];

      if (!access_ok(VERIFY_WRITE, buf, len))
            return -EFAULT;

      /* Wait for camera to become ready */
      for (;;)
      {
            int i = qcam_get(q, 41);
            if (i == -1) {
                  qc_setup(q);
                  return -EIO;
            }
            if ((i & 0x80) == 0)
                  break;
            else
                  schedule();
      }

      if (qcam_set(q, 7, (q->mode | (is_bi_dir?1:0)) + 1))
            return -EIO;

      lines = q->height;
      pixelsperline = q->width;
      bitsperxfer = (is_bi_dir) ? 24 : 8;

      if (is_bi_dir)
      {
            /* Turn the port around */
            parport_data_reverse(q->pport);
            mdelay(3);
            qcam_set_ack(q, 0);
            if (qcam_await_ready1(q, 1)) {
                  qc_setup(q);
                  return -EIO;
            }
            qcam_set_ack(q, 1);
            if (qcam_await_ready1(q, 0)) {
                  qc_setup(q);
                  return -EIO;
            }
      }

      wantlen = lines * pixelsperline * 24 / 8;

      while (wantlen)
      {
            size_t t, s;
            s = (wantlen > BUFSZ)?BUFSZ:wantlen;
            t = qcam_read_bytes(q, tmpbuf, s);
            if (outptr < len)
            {
                  size_t sz = len - outptr;
                  if (sz > t) sz = t;
                  if (__copy_to_user(buf+outptr, tmpbuf, sz))
                        break;
                  outptr += sz;
            }
            wantlen -= t;
            if (t < s)
                  break;
            cond_resched();
      }

      len = outptr;

      if (wantlen)
      {
            printk("qcam: short read.\n");
            if (is_bi_dir)
                  parport_data_forward(q->pport);
            qc_setup(q);
            return len;
      }

      if (is_bi_dir)
      {
            int l;
            do {
                  l = qcam_read_bytes(q, tmpbuf, 3);
                  cond_resched();
            } while (l && (tmpbuf[0] == 0x7e || tmpbuf[1] == 0x7e || tmpbuf[2] == 0x7e));
            if (force_rgb) {
                  if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
                        printk("qcam: bad EOF\n");
            } else {
                  if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
                        printk("qcam: bad EOF\n");
            }
            qcam_set_ack(q, 0);
            if (qcam_await_ready1(q, 1))
            {
                  printk("qcam: no ack after EOF\n");
                  parport_data_forward(q->pport);
                  qc_setup(q);
                  return len;
            }
            parport_data_forward(q->pport);
            mdelay(3);
            qcam_set_ack(q, 1);
            if (qcam_await_ready1(q, 0))
            {
                  printk("qcam: no ack to port turnaround\n");
                  qc_setup(q);
                  return len;
            }
      }
      else
      {
            int l;
            do {
                  l = qcam_read_bytes(q, tmpbuf, 1);
                  cond_resched();
            } while (l && tmpbuf[0] == 0x7e);
            l = qcam_read_bytes(q, tmpbuf+1, 2);
            if (force_rgb) {
                  if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
                        printk("qcam: bad EOF\n");
            } else {
                  if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
                        printk("qcam: bad EOF\n");
            }
      }

      qcam_write_data(q, 0);
      return len;
}

/*
 *    Video4linux interfacing
 */

static int qcam_do_ioctl(struct inode *inode, struct file *file,
                   unsigned int cmd, void *arg)
{
      struct video_device *dev = video_devdata(file);
      struct qcam_device *qcam=(struct qcam_device *)dev;

      switch(cmd)
      {
            case VIDIOCGCAP:
            {
                  struct video_capability *b = arg;
                  strcpy(b->name, "Quickcam");
                  b->type = VID_TYPE_CAPTURE|VID_TYPE_SCALES;
                  b->channels = 1;
                  b->audios = 0;
                  b->maxwidth = 320;
                  b->maxheight = 240;
                  b->minwidth = 80;
                  b->minheight = 60;
                  return 0;
            }
            case VIDIOCGCHAN:
            {
                  struct video_channel *v = arg;
                  if(v->channel!=0)
                        return -EINVAL;
                  v->flags=0;
                  v->tuners=0;
                  /* Good question.. its composite or SVHS so.. */
                  v->type = VIDEO_TYPE_CAMERA;
                  strcpy(v->name, "Camera");
                  return 0;
            }
            case VIDIOCSCHAN:
            {
                  struct video_channel *v = arg;
                  if(v->channel!=0)
                        return -EINVAL;
                  return 0;
            }
            case VIDIOCGTUNER:
            {
                  struct video_tuner *v = arg;
                  if(v->tuner)
                        return -EINVAL;
                  memset(v,0,sizeof(*v));
                  strcpy(v->name, "Format");
                  v->mode = VIDEO_MODE_AUTO;
                  return 0;
            }
            case VIDIOCSTUNER:
            {
                  struct video_tuner *v = arg;
                  if(v->tuner)
                        return -EINVAL;
                  if(v->mode!=VIDEO_MODE_AUTO)
                        return -EINVAL;
                  return 0;
            }
            case VIDIOCGPICT:
            {
                  struct video_picture *p = arg;
                  p->colour=0x8000;
                  p->hue=0x8000;
                  p->brightness=qcam->brightness<<8;
                  p->contrast=qcam->contrast<<8;
                  p->whiteness=qcam->whitebal<<8;
                  p->depth=24;
                  p->palette=VIDEO_PALETTE_RGB24;
                  return 0;
            }
            case VIDIOCSPICT:
            {
                  struct video_picture *p = arg;

                  /*
                   *    Sanity check args
                   */
                  if (p->depth != 24 || p->palette != VIDEO_PALETTE_RGB24)
                        return -EINVAL;

                  /*
                   *    Now load the camera.
                   */
                  qcam->brightness = p->brightness>>8;
                  qcam->contrast = p->contrast>>8;
                  qcam->whitebal = p->whiteness>>8;

                  mutex_lock(&qcam->lock);
                  parport_claim_or_block(qcam->pdev);
                  qc_setup(qcam);
                  parport_release(qcam->pdev);
                  mutex_unlock(&qcam->lock);
                  return 0;
            }
            case VIDIOCSWIN:
            {
                  struct video_window *vw = arg;

                  if(vw->flags)
                        return -EINVAL;
                  if(vw->clipcount)
                        return -EINVAL;
                  if(vw->height<60||vw->height>240)
                        return -EINVAL;
                  if(vw->width<80||vw->width>320)
                        return -EINVAL;

                  qcam->width = 80;
                  qcam->height = 60;
                  qcam->mode = QC_DECIMATION_4;

                  if(vw->width>=160 && vw->height>=120)
                  {
                        qcam->width = 160;
                        qcam->height = 120;
                        qcam->mode = QC_DECIMATION_2;
                  }
                  if(vw->width>=320 && vw->height>=240)
                  {
                        qcam->width = 320;
                        qcam->height = 240;
                        qcam->mode = QC_DECIMATION_1;
                  }
                  qcam->mode |= QC_MILLIONS;
#if 0
                  if(vw->width>=640 && vw->height>=480)
                  {
                        qcam->width = 640;
                        qcam->height = 480;
                        qcam->mode = QC_BILLIONS | QC_DECIMATION_1;
                  }
#endif
                  /* Ok we figured out what to use from our
                     wide choice */
                  mutex_lock(&qcam->lock);
                  parport_claim_or_block(qcam->pdev);
                  qc_setup(qcam);
                  parport_release(qcam->pdev);
                  mutex_unlock(&qcam->lock);
                  return 0;
            }
            case VIDIOCGWIN:
            {
                  struct video_window *vw = arg;
                  memset(vw, 0, sizeof(*vw));
                  vw->width=qcam->width;
                  vw->height=qcam->height;
                  return 0;
            }
            case VIDIOCKEY:
                  return 0;
            case VIDIOCCAPTURE:
            case VIDIOCGFBUF:
            case VIDIOCSFBUF:
            case VIDIOCGFREQ:
            case VIDIOCSFREQ:
            case VIDIOCGAUDIO:
            case VIDIOCSAUDIO:
                  return -EINVAL;
            default:
                  return -ENOIOCTLCMD;
      }
      return 0;
}

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

static ssize_t qcam_read(struct file *file, char __user *buf,
                   size_t count, loff_t *ppos)
{
      struct video_device *v = video_devdata(file);
      struct qcam_device *qcam=(struct qcam_device *)v;
      int len;

      mutex_lock(&qcam->lock);
      parport_claim_or_block(qcam->pdev);
      /* Probably should have a semaphore against multiple users */
      len = qc_capture(qcam, buf,count);
      parport_release(qcam->pdev);
      mutex_unlock(&qcam->lock);
      return len;
}

/* video device template */
static const struct file_operations qcam_fops = {
      .owner            = THIS_MODULE,
      .open           = video_exclusive_open,
      .release        = video_exclusive_release,
      .ioctl          = qcam_ioctl,
      .compat_ioctl     = v4l_compat_ioctl32,
      .read       = qcam_read,
      .llseek         = no_llseek,
};

static struct video_device qcam_template=
{
      .owner            = THIS_MODULE,
      .name       = "Colour QuickCam",
      .type       = VID_TYPE_CAPTURE,
      .fops           = &qcam_fops,
};

/* Initialize the QuickCam driver control structure. */

static struct qcam_device *qcam_init(struct parport *port)
{
      struct qcam_device *q;

      q = kmalloc(sizeof(struct qcam_device), GFP_KERNEL);
      if(q==NULL)
            return NULL;

      q->pport = port;
      q->pdev = parport_register_device(port, "c-qcam", NULL, NULL,
                                NULL, 0, NULL);

      q->bidirectional = (q->pport->modes & PARPORT_MODE_TRISTATE)?1:0;

      if (q->pdev == NULL)
      {
            printk(KERN_ERR "c-qcam: couldn't register for %s.\n",
                   port->name);
            kfree(q);
            return NULL;
      }

      memcpy(&q->vdev, &qcam_template, sizeof(qcam_template));

      mutex_init(&q->lock);
      q->width = q->ccd_width = 320;
      q->height = q->ccd_height = 240;
      q->mode = QC_MILLIONS | QC_DECIMATION_1;
      q->contrast = 192;
      q->brightness = 240;
      q->whitebal = 128;
      q->top = 1;
      q->left = 14;
      return q;
}

static struct qcam_device *qcams[MAX_CAMS];
static unsigned int num_cams = 0;

static int init_cqcam(struct parport *port)
{
      struct qcam_device *qcam;

      if (parport[0] != -1)
      {
            /* The user gave specific instructions */
            int i, found = 0;
            for (i = 0; i < MAX_CAMS && parport[i] != -1; i++)
            {
                  if (parport[0] == port->number)
                        found = 1;
            }
            if (!found)
                  return -ENODEV;
      }

      if (num_cams == MAX_CAMS)
            return -ENOSPC;

      qcam = qcam_init(port);
      if (qcam==NULL)
            return -ENODEV;

      parport_claim_or_block(qcam->pdev);

      qc_reset(qcam);

      if (probe && qc_detect(qcam)==0)
      {
            parport_release(qcam->pdev);
            parport_unregister_device(qcam->pdev);
            kfree(qcam);
            return -ENODEV;
      }

      qc_setup(qcam);

      parport_release(qcam->pdev);

      if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr)==-1)
      {
            printk(KERN_ERR "Unable to register Colour QuickCam on %s\n",
                   qcam->pport->name);
            parport_unregister_device(qcam->pdev);
            kfree(qcam);
            return -ENODEV;
      }

      printk(KERN_INFO "video%d: Colour QuickCam found on %s\n",
             qcam->vdev.minor, qcam->pport->name);

      qcams[num_cams++] = qcam;

      return 0;
}

static void close_cqcam(struct qcam_device *qcam)
{
      video_unregister_device(&qcam->vdev);
      parport_unregister_device(qcam->pdev);
      kfree(qcam);
}

static void cq_attach(struct parport *port)
{
      init_cqcam(port);
}

static void cq_detach(struct parport *port)
{
      /* Write this some day. */
}

static struct parport_driver cqcam_driver = {
      .name = "cqcam",
      .attach = cq_attach,
      .detach = cq_detach,
};

static int __init cqcam_init (void)
{
      printk(BANNER "\n");

      return parport_register_driver(&cqcam_driver);
}

static void __exit cqcam_cleanup (void)
{
      unsigned int i;

      for (i = 0; i < num_cams; i++)
            close_cqcam(qcams[i]);

      parport_unregister_driver(&cqcam_driver);
}

MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
MODULE_DESCRIPTION(BANNER);
MODULE_LICENSE("GPL");

/* FIXME: parport=auto would never have worked, surely? --RR */
MODULE_PARM_DESC(parport ,"parport=<auto|n[,n]...> for port detection method\n\
probe=<0|1|2> for camera detection method\n\
force_rgb=<0|1> for RGB data format (default BGR)");
module_param_array(parport, int, NULL, 0);
module_param(probe, int, 0);
module_param(force_rgb, bool, 0);
module_param(video_nr, int, 0);

module_init(cqcam_init);
module_exit(cqcam_cleanup);

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