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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/media/video/c-qcam.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/media/video/c-qcam.c')
-rw-r--r--drivers/media/video/c-qcam.c855
1 files changed, 855 insertions, 0 deletions
diff --git a/drivers/media/video/c-qcam.c b/drivers/media/video/c-qcam.c
new file mode 100644
index 00000000000..75442ec49f3
--- /dev/null
+++ b/drivers/media/video/c-qcam.c
@@ -0,0 +1,855 @@
+/*
+ * 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 <asm/semaphore.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 semaphore 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) < (HZ/25); )
+ 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) < (HZ/25); )
+ 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;
+
+ down(&qcam->lock);
+ parport_claim_or_block(qcam->pdev);
+ qc_setup(qcam);
+ parport_release(qcam->pdev);
+ up(&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 */
+ down(&qcam->lock);
+ parport_claim_or_block(qcam->pdev);
+ qc_setup(qcam);
+ parport_release(qcam->pdev);
+ up(&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;
+
+ down(&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);
+ up(&qcam->lock);
+ return len;
+}
+
+/* video device template */
+static struct file_operations qcam_fops = {
+ .owner = THIS_MODULE,
+ .open = video_exclusive_open,
+ .release = video_exclusive_release,
+ .ioctl = qcam_ioctl,
+ .read = qcam_read,
+ .llseek = no_llseek,
+};
+
+static struct video_device qcam_template=
+{
+ .owner = THIS_MODULE,
+ .name = "Colour QuickCam",
+ .type = VID_TYPE_CAPTURE,
+ .hardware = VID_HARDWARE_QCAM_C,
+ .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));
+
+ init_MUTEX(&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);