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Diffstat (limited to 'drivers/media/video/bw-qcam.c')
-rw-r--r--drivers/media/video/bw-qcam.c1027
1 files changed, 1027 insertions, 0 deletions
diff --git a/drivers/media/video/bw-qcam.c b/drivers/media/video/bw-qcam.c
new file mode 100644
index 00000000000..0065d0c240d
--- /dev/null
+++ b/drivers/media/video/bw-qcam.c
@@ -0,0 +1,1027 @@
+/*
+ * QuickCam Driver For Video4Linux.
+ *
+ * Video4Linux conversion work by Alan Cox.
+ * Parport compatibility by Phil Blundell.
+ * Busy loop avoidance by Mark Cooke.
+ *
+ * Module parameters:
+ *
+ * maxpoll=<1 - 5000>
+ *
+ * When polling the QuickCam for a response, busy-wait for a
+ * maximum of this many loops. The default of 250 gives little
+ * impact on interactive response.
+ *
+ * NOTE: If this parameter is set too high, the processor
+ * will busy wait until this loop times out, and then
+ * slowly poll for a further 5 seconds before failing
+ * the transaction. You have been warned.
+ *
+ * yieldlines=<1 - 250>
+ *
+ * When acquiring a frame from the camera, the data gathering
+ * loop will yield back to the scheduler after completing
+ * this many lines. The default of 4 provides a trade-off
+ * between increased frame acquisition time and impact on
+ * interactive response.
+ */
+
+/* qcam-lib.c -- Library for programming with the Connectix QuickCam.
+ * See the included documentation for usage instructions and details
+ * of the protocol involved. */
+
+
+/* Version 0.5, August 4, 1996 */
+/* Version 0.7, August 27, 1996 */
+/* Version 0.9, November 17, 1996 */
+
+
+/******************************************************************
+
+Copyright (C) 1996 by Scott Laird
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL SCOTT LAIRD BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+******************************************************************/
+
+#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>
+
+#include "bw-qcam.h"
+
+static unsigned int maxpoll=250; /* Maximum busy-loop count for qcam I/O */
+static unsigned int yieldlines=4; /* Yield after this many during capture */
+static int video_nr = -1;
+
+module_param(maxpoll, int, 0);
+module_param(yieldlines, int, 0);
+module_param(video_nr, int, 0);
+
+static inline int read_lpstatus(struct qcam_device *q)
+{
+ return parport_read_status(q->pport);
+}
+
+static inline int read_lpdata(struct qcam_device *q)
+{
+ return parport_read_data(q->pport);
+}
+
+static inline void write_lpdata(struct qcam_device *q, int d)
+{
+ parport_write_data(q->pport, d);
+}
+
+static inline void write_lpcontrol(struct qcam_device *q, int d)
+{
+ parport_write_control(q->pport, d);
+}
+
+static int qc_waithand(struct qcam_device *q, int val);
+static int qc_command(struct qcam_device *q, int command);
+static int qc_readparam(struct qcam_device *q);
+static int qc_setscanmode(struct qcam_device *q);
+static int qc_readbytes(struct qcam_device *q, char buffer[]);
+
+static struct video_device qcam_template;
+
+static int qc_calibrate(struct qcam_device *q)
+{
+ /*
+ * Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96
+ * The white balance is an individiual value for each
+ * quickcam.
+ */
+
+ int value;
+ int count = 0;
+
+ qc_command(q, 27); /* AutoAdjustOffset */
+ qc_command(q, 0); /* Dummy Parameter, ignored by the camera */
+
+ /* GetOffset (33) will read 255 until autocalibration */
+ /* is finished. After that, a value of 1-254 will be */
+ /* returned. */
+
+ do {
+ qc_command(q, 33);
+ value = qc_readparam(q);
+ mdelay(1);
+ schedule();
+ count++;
+ } while (value == 0xff && count<2048);
+
+ q->whitebal = value;
+ return value;
+}
+
+/* Initialize the QuickCam driver control structure. This is where
+ * defaults are set for people who don't have a config file.*/
+
+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, "bw-qcam", NULL, NULL,
+ NULL, 0, NULL);
+ if (q->pdev == NULL)
+ {
+ printk(KERN_ERR "bw-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->port_mode = (QC_ANY | QC_NOTSET);
+ q->width = 320;
+ q->height = 240;
+ q->bpp = 4;
+ q->transfer_scale = 2;
+ q->contrast = 192;
+ q->brightness = 180;
+ q->whitebal = 105;
+ q->top = 1;
+ q->left = 14;
+ q->mode = -1;
+ q->status = QC_PARAM_CHANGE;
+ return q;
+}
+
+
+/* qc_command is probably a bit of a misnomer -- it's used to send
+ * bytes *to* the camera. Generally, these bytes are either commands
+ * or arguments to commands, so the name fits, but it still bugs me a
+ * bit. See the documentation for a list of commands. */
+
+static int qc_command(struct qcam_device *q, int command)
+{
+ int n1, n2;
+ int cmd;
+
+ write_lpdata(q, command);
+ write_lpcontrol(q, 6);
+
+ n1 = qc_waithand(q, 1);
+
+ write_lpcontrol(q, 0xe);
+ n2 = qc_waithand(q, 0);
+
+ cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4);
+ return cmd;
+}
+
+static int qc_readparam(struct qcam_device *q)
+{
+ int n1, n2;
+ int cmd;
+
+ write_lpcontrol(q, 6);
+ n1 = qc_waithand(q, 1);
+
+ write_lpcontrol(q, 0xe);
+ n2 = qc_waithand(q, 0);
+
+ cmd = (n1 & 0xf0) | ((n2 & 0xf0) >> 4);
+ return cmd;
+}
+
+/* qc_waithand busy-waits for a handshake signal from the QuickCam.
+ * Almost all communication with the camera requires handshaking. */
+
+static int qc_waithand(struct qcam_device *q, int val)
+{
+ int status;
+ int runs=0;
+
+ if (val)
+ {
+ while (!((status = read_lpstatus(q)) & 8))
+ {
+ /* 1000 is enough spins on the I/O for all normal
+ cases, at that point we start to poll slowly
+ until the camera wakes up. However, we are
+ busy blocked until the camera responds, so
+ setting it lower is much better for interactive
+ response. */
+
+ if(runs++>maxpoll)
+ {
+ msleep_interruptible(5);
+ }
+ if(runs>(maxpoll+1000)) /* 5 seconds */
+ return -1;
+ }
+ }
+ else
+ {
+ while (((status = read_lpstatus(q)) & 8))
+ {
+ /* 1000 is enough spins on the I/O for all normal
+ cases, at that point we start to poll slowly
+ until the camera wakes up. However, we are
+ busy blocked until the camera responds, so
+ setting it lower is much better for interactive
+ response. */
+
+ if(runs++>maxpoll)
+ {
+ msleep_interruptible(5);
+ }
+ if(runs++>(maxpoll+1000)) /* 5 seconds */
+ return -1;
+ }
+ }
+
+ return status;
+}
+
+/* Waithand2 is used when the qcam is in bidirectional mode, and the
+ * handshaking signal is CamRdy2 (bit 0 of data reg) instead of CamRdy1
+ * (bit 3 of status register). It also returns the last value read,
+ * since this data is useful. */
+
+static unsigned int qc_waithand2(struct qcam_device *q, int val)
+{
+ unsigned int status;
+ int runs=0;
+
+ do
+ {
+ status = read_lpdata(q);
+ /* 1000 is enough spins on the I/O for all normal
+ cases, at that point we start to poll slowly
+ until the camera wakes up. However, we are
+ busy blocked until the camera responds, so
+ setting it lower is much better for interactive
+ response. */
+
+ if(runs++>maxpoll)
+ {
+ msleep_interruptible(5);
+ }
+ if(runs++>(maxpoll+1000)) /* 5 seconds */
+ return 0;
+ }
+ while ((status & 1) != val);
+
+ return status;
+}
+
+
+/* Try to detect a QuickCam. It appears to flash the upper 4 bits of
+ the status register at 5-10 Hz. This is only used in the autoprobe
+ code. Be aware that this isn't the way Connectix detects the
+ camera (they send a reset and try to handshake), but this should be
+ almost completely safe, while their method screws up my printer if
+ I plug it in before the camera. */
+
+static int qc_detect(struct qcam_device *q)
+{
+ int reg, lastreg;
+ int count = 0;
+ int i;
+
+ lastreg = reg = read_lpstatus(q) & 0xf0;
+
+ for (i = 0; i < 500; i++)
+ {
+ reg = read_lpstatus(q) & 0xf0;
+ if (reg != lastreg)
+ count++;
+ lastreg = reg;
+ mdelay(2);
+ }
+
+
+#if 0
+ /* Force camera detection during testing. Sometimes the camera
+ won't be flashing these bits. Possibly unloading the module
+ in the middle of a grab? Or some timeout condition?
+ I've seen this parameter as low as 19 on my 450Mhz box - mpc */
+ printk("Debugging: QCam detection counter <30-200 counts as detected>: %d\n", count);
+ return 1;
+#endif
+
+ /* Be (even more) liberal in what you accept... */
+
+/* if (count > 30 && count < 200) */
+ if (count > 20 && count < 300)
+ return 1; /* found */
+ else
+ return 0; /* not found */
+}
+
+
+/* Reset the QuickCam. This uses the same sequence the Windows
+ * QuickPic program uses. Someone with a bi-directional port should
+ * check that bi-directional mode is detected right, and then
+ * implement bi-directional mode in qc_readbyte(). */
+
+static void qc_reset(struct qcam_device *q)
+{
+ switch (q->port_mode & QC_FORCE_MASK)
+ {
+ case QC_FORCE_UNIDIR:
+ q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR;
+ break;
+
+ case QC_FORCE_BIDIR:
+ q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR;
+ break;
+
+ case QC_ANY:
+ write_lpcontrol(q, 0x20);
+ write_lpdata(q, 0x75);
+
+ if (read_lpdata(q) != 0x75) {
+ q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_BIDIR;
+ } else {
+ q->port_mode = (q->port_mode & ~QC_MODE_MASK) | QC_UNIDIR;
+ }
+ break;
+ }
+
+ write_lpcontrol(q, 0xb);
+ udelay(250);
+ write_lpcontrol(q, 0xe);
+ qc_setscanmode(q); /* in case port_mode changed */
+}
+
+
+/* Decide which scan mode to use. There's no real requirement that
+ * the scanmode match the resolution in q->height and q-> width -- the
+ * camera takes the picture at the resolution specified in the
+ * "scanmode" and then returns the image at the resolution specified
+ * with the resolution commands. If the scan is bigger than the
+ * requested resolution, the upper-left hand corner of the scan is
+ * returned. If the scan is smaller, then the rest of the image
+ * returned contains garbage. */
+
+static int qc_setscanmode(struct qcam_device *q)
+{
+ int old_mode = q->mode;
+
+ switch (q->transfer_scale)
+ {
+ case 1:
+ q->mode = 0;
+ break;
+ case 2:
+ q->mode = 4;
+ break;
+ case 4:
+ q->mode = 8;
+ break;
+ }
+
+ switch (q->bpp)
+ {
+ case 4:
+ break;
+ case 6:
+ q->mode += 2;
+ break;
+ }
+
+ switch (q->port_mode & QC_MODE_MASK)
+ {
+ case QC_BIDIR:
+ q->mode += 1;
+ break;
+ case QC_NOTSET:
+ case QC_UNIDIR:
+ break;
+ }
+
+ if (q->mode != old_mode)
+ q->status |= QC_PARAM_CHANGE;
+
+ return 0;
+}
+
+
+/* Reset the QuickCam and program for brightness, contrast,
+ * white-balance, and resolution. */
+
+static void qc_set(struct qcam_device *q)
+{
+ int val;
+ int val2;
+
+ qc_reset(q);
+
+ /* Set the brightness. Yes, this is repetitive, but it works.
+ * Shorter versions seem to fail subtly. Feel free to try :-). */
+ /* I think the problem was in qc_command, not here -- bls */
+
+ qc_command(q, 0xb);
+ qc_command(q, q->brightness);
+
+ val = q->height / q->transfer_scale;
+ qc_command(q, 0x11);
+ qc_command(q, val);
+ if ((q->port_mode & QC_MODE_MASK) == QC_UNIDIR && q->bpp == 6) {
+ /* The normal "transfers per line" calculation doesn't seem to work
+ as expected here (and yet it works fine in qc_scan). No idea
+ why this case is the odd man out. Fortunately, Laird's original
+ working version gives me a good way to guess at working values.
+ -- bls */
+ val = q->width;
+ val2 = q->transfer_scale * 4;
+ } else {
+ val = q->width * q->bpp;
+ val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) *
+ q->transfer_scale;
+ }
+ val = (val + val2 - 1) / val2;
+ qc_command(q, 0x13);
+ qc_command(q, val);
+
+ /* Setting top and left -- bls */
+ qc_command(q, 0xd);
+ qc_command(q, q->top);
+ qc_command(q, 0xf);
+ qc_command(q, q->left / 2);
+
+ qc_command(q, 0x19);
+ qc_command(q, q->contrast);
+ qc_command(q, 0x1f);
+ qc_command(q, q->whitebal);
+
+ /* Clear flag that we must update the grabbing parameters on the camera
+ before we grab the next frame */
+ q->status &= (~QC_PARAM_CHANGE);
+}
+
+/* Qc_readbytes reads some bytes from the QC and puts them in
+ the supplied buffer. It returns the number of bytes read,
+ or -1 on error. */
+
+static inline int qc_readbytes(struct qcam_device *q, char buffer[])
+{
+ int ret=1;
+ unsigned int hi, lo;
+ unsigned int hi2, lo2;
+ static int state = 0;
+
+ if (buffer == NULL)
+ {
+ state = 0;
+ return 0;
+ }
+
+ switch (q->port_mode & QC_MODE_MASK)
+ {
+ case QC_BIDIR: /* Bi-directional Port */
+ write_lpcontrol(q, 0x26);
+ lo = (qc_waithand2(q, 1) >> 1);
+ hi = (read_lpstatus(q) >> 3) & 0x1f;
+ write_lpcontrol(q, 0x2e);
+ lo2 = (qc_waithand2(q, 0) >> 1);
+ hi2 = (read_lpstatus(q) >> 3) & 0x1f;
+ switch (q->bpp)
+ {
+ case 4:
+ buffer[0] = lo & 0xf;
+ buffer[1] = ((lo & 0x70) >> 4) | ((hi & 1) << 3);
+ buffer[2] = (hi & 0x1e) >> 1;
+ buffer[3] = lo2 & 0xf;
+ buffer[4] = ((lo2 & 0x70) >> 4) | ((hi2 & 1) << 3);
+ buffer[5] = (hi2 & 0x1e) >> 1;
+ ret = 6;
+ break;
+ case 6:
+ buffer[0] = lo & 0x3f;
+ buffer[1] = ((lo & 0x40) >> 6) | (hi << 1);
+ buffer[2] = lo2 & 0x3f;
+ buffer[3] = ((lo2 & 0x40) >> 6) | (hi2 << 1);
+ ret = 4;
+ break;
+ }
+ break;
+
+ case QC_UNIDIR: /* Unidirectional Port */
+ write_lpcontrol(q, 6);
+ lo = (qc_waithand(q, 1) & 0xf0) >> 4;
+ write_lpcontrol(q, 0xe);
+ hi = (qc_waithand(q, 0) & 0xf0) >> 4;
+
+ switch (q->bpp)
+ {
+ case 4:
+ buffer[0] = lo;
+ buffer[1] = hi;
+ ret = 2;
+ break;
+ case 6:
+ switch (state)
+ {
+ case 0:
+ buffer[0] = (lo << 2) | ((hi & 0xc) >> 2);
+ q->saved_bits = (hi & 3) << 4;
+ state = 1;
+ ret = 1;
+ break;
+ case 1:
+ buffer[0] = lo | q->saved_bits;
+ q->saved_bits = hi << 2;
+ state = 2;
+ ret = 1;
+ break;
+ case 2:
+ buffer[0] = ((lo & 0xc) >> 2) | q->saved_bits;
+ buffer[1] = ((lo & 3) << 4) | hi;
+ state = 0;
+ ret = 2;
+ break;
+ }
+ break;
+ }
+ break;
+ }
+ return ret;
+}
+
+/* requests a scan from the camera. It sends the correct instructions
+ * to the camera and then reads back the correct number of bytes. In
+ * previous versions of this routine the return structure contained
+ * the raw output from the camera, and there was a 'qc_convertscan'
+ * function that converted that to a useful format. In version 0.3 I
+ * rolled qc_convertscan into qc_scan and now I only return the
+ * converted scan. The format is just an one-dimensional array of
+ * characters, one for each pixel, with 0=black up to n=white, where
+ * n=2^(bit depth)-1. Ask me for more details if you don't understand
+ * this. */
+
+static long qc_capture(struct qcam_device * q, char __user *buf, unsigned long len)
+{
+ int i, j, k, yield;
+ int bytes;
+ int linestotrans, transperline;
+ int divisor;
+ int pixels_per_line;
+ int pixels_read = 0;
+ int got=0;
+ char buffer[6];
+ int shift=8-q->bpp;
+ char invert;
+
+ if (q->mode == -1)
+ return -ENXIO;
+
+ qc_command(q, 0x7);
+ qc_command(q, q->mode);
+
+ if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR)
+ {
+ write_lpcontrol(q, 0x2e); /* turn port around */
+ write_lpcontrol(q, 0x26);
+ (void) qc_waithand(q, 1);
+ write_lpcontrol(q, 0x2e);
+ (void) qc_waithand(q, 0);
+ }
+
+ /* strange -- should be 15:63 below, but 4bpp is odd */
+ invert = (q->bpp == 4) ? 16 : 63;
+
+ linestotrans = q->height / q->transfer_scale;
+ pixels_per_line = q->width / q->transfer_scale;
+ transperline = q->width * q->bpp;
+ divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) *
+ q->transfer_scale;
+ transperline = (transperline + divisor - 1) / divisor;
+
+ for (i = 0, yield = yieldlines; i < linestotrans; i++)
+ {
+ for (pixels_read = j = 0; j < transperline; j++)
+ {
+ bytes = qc_readbytes(q, buffer);
+ for (k = 0; k < bytes && (pixels_read + k) < pixels_per_line; k++)
+ {
+ int o;
+ if (buffer[k] == 0 && invert == 16)
+ {
+ /* 4bpp is odd (again) -- inverter is 16, not 15, but output
+ must be 0-15 -- bls */
+ buffer[k] = 16;
+ }
+ o=i*pixels_per_line + pixels_read + k;
+ if(o<len)
+ {
+ got++;
+ put_user((invert - buffer[k])<<shift, buf+o);
+ }
+ }
+ pixels_read += bytes;
+ }
+ (void) qc_readbytes(q, NULL); /* reset state machine */
+
+ /* Grabbing an entire frame from the quickcam is a lengthy
+ process. We don't (usually) want to busy-block the
+ processor for the entire frame. yieldlines is a module
+ parameter. If we yield every line, the minimum frame
+ time will be 240 / 200 = 1.2 seconds. The compile-time
+ default is to yield every 4 lines. */
+ if (i >= yield) {
+ msleep_interruptible(5);
+ yield = i + yieldlines;
+ }
+ }
+
+ if ((q->port_mode & QC_MODE_MASK) == QC_BIDIR)
+ {
+ write_lpcontrol(q, 2);
+ write_lpcontrol(q, 6);
+ udelay(3);
+ write_lpcontrol(q, 0xe);
+ }
+ if(got<len)
+ return got;
+ 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|VID_TYPE_MONOCHROME;
+ 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;
+ strcpy(v->name, "Format");
+ v->rangelow=0;
+ v->rangehigh=0;
+ v->flags= 0;
+ 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=qcam->bpp;
+ p->palette=VIDEO_PALETTE_GREY;
+ return 0;
+ }
+ case VIDIOCSPICT:
+ {
+ struct video_picture *p = arg;
+ if(p->palette!=VIDEO_PALETTE_GREY)
+ return -EINVAL;
+ if(p->depth!=4 && p->depth!=6)
+ return -EINVAL;
+
+ /*
+ * Now load the camera.
+ */
+
+ qcam->brightness = p->brightness>>8;
+ qcam->contrast = p->contrast>>8;
+ qcam->whitebal = p->whiteness>>8;
+ qcam->bpp = p->depth;
+
+ down(&qcam->lock);
+ qc_setscanmode(qcam);
+ up(&qcam->lock);
+ qcam->status |= QC_PARAM_CHANGE;
+
+ 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 = 320;
+ qcam->height = 240;
+ qcam->transfer_scale = 4;
+
+ if(vw->width>=160 && vw->height>=120)
+ {
+ qcam->transfer_scale = 2;
+ }
+ if(vw->width>=320 && vw->height>=240)
+ {
+ qcam->width = 320;
+ qcam->height = 240;
+ qcam->transfer_scale = 1;
+ }
+ down(&qcam->lock);
+ qc_setscanmode(qcam);
+ up(&qcam->lock);
+
+ /* We must update the camera before we grab. We could
+ just have changed the grab size */
+ qcam->status |= QC_PARAM_CHANGE;
+
+ /* Ok we figured out what to use from our wide choice */
+ return 0;
+ }
+ case VIDIOCGWIN:
+ {
+ struct video_window *vw = arg;
+ memset(vw, 0, sizeof(*vw));
+ vw->width=qcam->width/qcam->transfer_scale;
+ vw->height=qcam->height/qcam->transfer_scale;
+ 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;
+ parport_claim_or_block(qcam->pdev);
+
+ down(&qcam->lock);
+
+ qc_reset(qcam);
+
+ /* Update the camera parameters if we need to */
+ if (qcam->status & QC_PARAM_CHANGE)
+ qc_set(qcam);
+
+ len=qc_capture(qcam, buf,count);
+
+ up(&qcam->lock);
+
+ parport_release(qcam->pdev);
+ return len;
+}
+
+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 = "Connectix Quickcam",
+ .type = VID_TYPE_CAPTURE,
+ .hardware = VID_HARDWARE_QCAM_BW,
+ .fops = &qcam_fops,
+};
+
+#define MAX_CAMS 4
+static struct qcam_device *qcams[MAX_CAMS];
+static unsigned int num_cams = 0;
+
+static int init_bwqcam(struct parport *port)
+{
+ struct qcam_device *qcam;
+
+ if (num_cams == MAX_CAMS)
+ {
+ printk(KERN_ERR "Too many Quickcams (max %d)\n", MAX_CAMS);
+ return -ENOSPC;
+ }
+
+ qcam=qcam_init(port);
+ if(qcam==NULL)
+ return -ENODEV;
+
+ parport_claim_or_block(qcam->pdev);
+
+ qc_reset(qcam);
+
+ if(qc_detect(qcam)==0)
+ {
+ parport_release(qcam->pdev);
+ parport_unregister_device(qcam->pdev);
+ kfree(qcam);
+ return -ENODEV;
+ }
+ qc_calibrate(qcam);
+
+ parport_release(qcam->pdev);
+
+ printk(KERN_INFO "Connectix Quickcam on %s\n", qcam->pport->name);
+
+ if(video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr)==-1)
+ {
+ parport_unregister_device(qcam->pdev);
+ kfree(qcam);
+ return -ENODEV;
+ }
+
+ qcams[num_cams++] = qcam;
+
+ return 0;
+}
+
+static void close_bwqcam(struct qcam_device *qcam)
+{
+ video_unregister_device(&qcam->vdev);
+ parport_unregister_device(qcam->pdev);
+ kfree(qcam);
+}
+
+/* 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> */
+#ifdef MODULE
+static char *parport[MAX_CAMS] = { NULL, };
+module_param_array(parport, charp, NULL, 0);
+#endif
+
+static int accept_bwqcam(struct parport *port)
+{
+#ifdef MODULE
+ int n;
+
+ if (parport[0] && strncmp(parport[0], "auto", 4) != 0) {
+ /* user gave parport parameters */
+ for(n=0; parport[n] && n<MAX_CAMS; n++){
+ char *ep;
+ unsigned long r;
+ r = simple_strtoul(parport[n], &ep, 0);
+ if (ep == parport[n]) {
+ printk(KERN_ERR
+ "bw-qcam: bad port specifier \"%s\"\n",
+ parport[n]);
+ continue;
+ }
+ if (r == port->number)
+ return 1;
+ }
+ return 0;
+ }
+#endif
+ return 1;
+}
+
+static void bwqcam_attach(struct parport *port)
+{
+ if (accept_bwqcam(port))
+ init_bwqcam(port);
+}
+
+static void bwqcam_detach(struct parport *port)
+{
+ int i;
+ for (i = 0; i < num_cams; i++) {
+ struct qcam_device *qcam = qcams[i];
+ if (qcam && qcam->pdev->port == port) {
+ qcams[i] = NULL;
+ close_bwqcam(qcam);
+ }
+ }
+}
+
+static struct parport_driver bwqcam_driver = {
+ .name = "bw-qcam",
+ .attach = bwqcam_attach,
+ .detach = bwqcam_detach,
+};
+
+static void __exit exit_bw_qcams(void)
+{
+ parport_unregister_driver(&bwqcam_driver);
+}
+
+static int __init init_bw_qcams(void)
+{
+#ifdef MODULE
+ /* Do some sanity checks on the module parameters. */
+ if (maxpoll > 5000) {
+ printk("Connectix Quickcam max-poll was above 5000. Using 5000.\n");
+ maxpoll = 5000;
+ }
+
+ if (yieldlines < 1) {
+ printk("Connectix Quickcam yieldlines was less than 1. Using 1.\n");
+ yieldlines = 1;
+ }
+#endif
+ return parport_register_driver(&bwqcam_driver);
+}
+
+module_init(init_bw_qcams);
+module_exit(exit_bw_qcams);
+
+MODULE_LICENSE("GPL");