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!

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 000000000000..0065d0c240d1
--- /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");