[media] move parallel port/isa video drivers to drivers/media/parport/

We should keep just the I2C drivers under drivers/media/video, and
then rename it to drivers/media/i2c.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 1113 insertions, 0 deletions

diff --git a/drivers/media/parport/bw-qcam.c b/drivers/media/parport/bw-qcam.c
new file mode 100644
index 000000000000..5b75a64b199b
--- /dev/null
+++ b/drivers/media/parport/bw-qcam.c
@@ -0,0 +1,1113 @@
+/*
+ *    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/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/parport.h>
+#include <linux/sched.h>
+#include <linux/videodev2.h>
+#include <linux/mutex.h>
+#include <asm/uaccess.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+
+/* One from column A... */
+#define QC_NOTSET 0
+#define QC_UNIDIR 1
+#define QC_BIDIR  2
+#define QC_SERIAL 3
+
+/* ... and one from column B */
+#define QC_ANY          0x00
+#define QC_FORCE_UNIDIR 0x10
+#define QC_FORCE_BIDIR  0x20
+#define QC_FORCE_SERIAL 0x30
+/* in the port_mode member */
+
+#define QC_MODE_MASK    0x07
+#define QC_FORCE_MASK   0x70
+
+#define MAX_HEIGHT 243
+#define MAX_WIDTH 336
+
+/* Bit fields for status flags */
+#define QC_PARAM_CHANGE	0x01 /* Camera status change has occurred */
+
+struct qcam {
+	struct v4l2_device v4l2_dev;
+	struct video_device vdev;
+	struct v4l2_ctrl_handler hdl;
+	struct pardevice *pdev;
+	struct parport *pport;
+	struct mutex lock;
+	int width, height;
+	int bpp;
+	int mode;
+	int contrast, brightness, whitebal;
+	int port_mode;
+	int transfer_scale;
+	int top, left;
+	int status;
+	unsigned int saved_bits;
+	unsigned long in_use;
+};
+
+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;
+static unsigned int force_init;		/* Whether to probe aggressively */
+
+module_param(maxpoll, int, 0);
+module_param(yieldlines, int, 0);
+module_param(video_nr, int, 0);
+
+/* Set force_init=1 to avoid detection by polling status register and
+ * immediately attempt to initialize qcam */
+module_param(force_init, int, 0);
+
+#define MAX_CAMS 4
+static struct qcam *qcams[MAX_CAMS];
+static unsigned int num_cams;
+
+static inline int read_lpstatus(struct qcam *q)
+{
+	return parport_read_status(q->pport);
+}
+
+static inline int read_lpdata(struct qcam *q)
+{
+	return parport_read_data(q->pport);
+}
+
+static inline void write_lpdata(struct qcam *q, int d)
+{
+	parport_write_data(q->pport, d);
+}
+
+static void write_lpcontrol(struct qcam *q, int d)
+{
+	if (d & 0x20) {
+		/* Set bidirectional mode to reverse (data in) */
+		parport_data_reverse(q->pport);
+	} else {
+		/* Set bidirectional mode to forward (data out) */
+		parport_data_forward(q->pport);
+	}
+
+	/* Now issue the regular port command, but strip out the
+	 * direction flag */
+	d &= ~0x20;
+	parport_write_control(q->pport, d);
+}
+
+
+/* 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 *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 *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;
+}
+
+/* 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 *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 *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;
+}
+
+
+/* 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 *q)
+{
+	int reg, lastreg;
+	int count = 0;
+	int i;
+
+	if (force_init)
+		return 1;
+
+	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(KERN_DEBUG "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 > 20 && count < 400) {
+		return 1;	/* found */
+	} else {
+		printk(KERN_ERR "No Quickcam found on port %s\n",
+				q->pport->name);
+		printk(KERN_DEBUG "Quickcam detection counter: %u\n", count);
+		return 0;	/* not found */
+	}
+}
+
+/* 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 *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.  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 *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 */
+}
+
+
+
+/* Reset the QuickCam and program for brightness, contrast,
+ * white-balance, and resolution. */
+
+static void qc_set(struct qcam *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 = DIV_ROUND_UP(val, 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 *q, char buffer[])
+{
+	int ret = 1;
+	unsigned int hi, lo;
+	unsigned int hi2, lo2;
+	static int state;
+
+	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 *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);
+		qc_waithand(q, 1);
+		write_lpcontrol(q, 0x2e);
+		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 = DIV_ROUND_UP(transperline, 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) {
+					u8 ch = invert - buffer[k];
+					got++;
+					put_user(ch << shift, buf + o);
+				}
+			}
+			pixels_read += bytes;
+		}
+		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_querycap(struct file *file, void  *priv,
+					struct v4l2_capability *vcap)
+{
+	struct qcam *qcam = video_drvdata(file);
+
+	strlcpy(vcap->driver, qcam->v4l2_dev.name, sizeof(vcap->driver));
+	strlcpy(vcap->card, "Connectix B&W Quickcam", sizeof(vcap->card));
+	strlcpy(vcap->bus_info, qcam->pport->name, sizeof(vcap->bus_info));
+	vcap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
+	vcap->capabilities = vcap->device_caps | V4L2_CAP_DEVICE_CAPS;
+	return 0;
+}
+
+static int qcam_enum_input(struct file *file, void *fh, struct v4l2_input *vin)
+{
+	if (vin->index > 0)
+		return -EINVAL;
+	strlcpy(vin->name, "Camera", sizeof(vin->name));
+	vin->type = V4L2_INPUT_TYPE_CAMERA;
+	vin->audioset = 0;
+	vin->tuner = 0;
+	vin->std = 0;
+	vin->status = 0;
+	return 0;
+}
+
+static int qcam_g_input(struct file *file, void *fh, unsigned int *inp)
+{
+	*inp = 0;
+	return 0;
+}
+
+static int qcam_s_input(struct file *file, void *fh, unsigned int inp)
+{
+	return (inp > 0) ? -EINVAL : 0;
+}
+
+static int qcam_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
+{
+	struct qcam *qcam = video_drvdata(file);
+	struct v4l2_pix_format *pix = &fmt->fmt.pix;
+
+	pix->width = qcam->width / qcam->transfer_scale;
+	pix->height = qcam->height / qcam->transfer_scale;
+	pix->pixelformat = (qcam->bpp == 4) ? V4L2_PIX_FMT_Y4 : V4L2_PIX_FMT_Y6;
+	pix->field = V4L2_FIELD_NONE;
+	pix->bytesperline = pix->width;
+	pix->sizeimage = pix->width * pix->height;
+	/* Just a guess */
+	pix->colorspace = V4L2_COLORSPACE_SRGB;
+	return 0;
+}
+
+static int qcam_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
+{
+	struct v4l2_pix_format *pix = &fmt->fmt.pix;
+
+	if (pix->height <= 60 || pix->width <= 80) {
+		pix->height = 60;
+		pix->width = 80;
+	} else if (pix->height <= 120 || pix->width <= 160) {
+		pix->height = 120;
+		pix->width = 160;
+	} else {
+		pix->height = 240;
+		pix->width = 320;
+	}
+	if (pix->pixelformat != V4L2_PIX_FMT_Y4 &&
+	    pix->pixelformat != V4L2_PIX_FMT_Y6)
+		pix->pixelformat = V4L2_PIX_FMT_Y4;
+	pix->field = V4L2_FIELD_NONE;
+	pix->bytesperline = pix->width;
+	pix->sizeimage = pix->width * pix->height;
+	/* Just a guess */
+	pix->colorspace = V4L2_COLORSPACE_SRGB;
+	return 0;
+}
+
+static int qcam_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
+{
+	struct qcam *qcam = video_drvdata(file);
+	struct v4l2_pix_format *pix = &fmt->fmt.pix;
+	int ret = qcam_try_fmt_vid_cap(file, fh, fmt);
+
+	if (ret)
+		return ret;
+	qcam->width = 320;
+	qcam->height = 240;
+	if (pix->height == 60)
+		qcam->transfer_scale = 4;
+	else if (pix->height == 120)
+		qcam->transfer_scale = 2;
+	else
+		qcam->transfer_scale = 1;
+	if (pix->pixelformat == V4L2_PIX_FMT_Y6)
+		qcam->bpp = 6;
+	else
+		qcam->bpp = 4;
+
+	mutex_lock(&qcam->lock);
+	qc_setscanmode(qcam);
+	/* We must update the camera before we grab. We could
+	   just have changed the grab size */
+	qcam->status |= QC_PARAM_CHANGE;
+	mutex_unlock(&qcam->lock);
+	return 0;
+}
+
+static int qcam_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *fmt)
+{
+	static struct v4l2_fmtdesc formats[] = {
+		{ 0, 0, 0,
+		  "4-Bit Monochrome", V4L2_PIX_FMT_Y4,
+		  { 0, 0, 0, 0 }
+		},
+		{ 1, 0, 0,
+		  "6-Bit Monochrome", V4L2_PIX_FMT_Y6,
+		  { 0, 0, 0, 0 }
+		},
+	};
+	enum v4l2_buf_type type = fmt->type;
+
+	if (fmt->index > 1)
+		return -EINVAL;
+
+	*fmt = formats[fmt->index];
+	fmt->type = type;
+	return 0;
+}
+
+static int qcam_enum_framesizes(struct file *file, void *fh,
+					 struct v4l2_frmsizeenum *fsize)
+{
+	static const struct v4l2_frmsize_discrete sizes[] = {
+		{  80,  60 },
+		{ 160, 120 },
+		{ 320, 240 },
+	};
+
+	if (fsize->index > 2)
+		return -EINVAL;
+	if (fsize->pixel_format != V4L2_PIX_FMT_Y4 &&
+	    fsize->pixel_format != V4L2_PIX_FMT_Y6)
+		return -EINVAL;
+	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+	fsize->discrete = sizes[fsize->index];
+	return 0;
+}
+
+static ssize_t qcam_read(struct file *file, char __user *buf,
+		size_t count, loff_t *ppos)
+{
+	struct qcam *qcam = video_drvdata(file);
+	int len;
+	parport_claim_or_block(qcam->pdev);
+
+	mutex_lock(&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);
+
+	mutex_unlock(&qcam->lock);
+
+	parport_release(qcam->pdev);
+	return len;
+}
+
+static unsigned int qcam_poll(struct file *filp, poll_table *wait)
+{
+	return v4l2_ctrl_poll(filp, wait) | POLLIN | POLLRDNORM;
+}
+
+static int qcam_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct qcam *qcam =
+		container_of(ctrl->handler, struct qcam, hdl);
+	int ret = 0;
+
+	mutex_lock(&qcam->lock);
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		qcam->brightness = ctrl->val;
+		break;
+	case V4L2_CID_CONTRAST:
+		qcam->contrast = ctrl->val;
+		break;
+	case V4L2_CID_GAMMA:
+		qcam->whitebal = ctrl->val;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	if (ret == 0) {
+		qc_setscanmode(qcam);
+		qcam->status |= QC_PARAM_CHANGE;
+	}
+	mutex_unlock(&qcam->lock);
+	return ret;
+}
+
+static const struct v4l2_file_operations qcam_fops = {
+	.owner		= THIS_MODULE,
+	.open		= v4l2_fh_open,
+	.release	= v4l2_fh_release,
+	.poll		= qcam_poll,
+	.unlocked_ioctl = video_ioctl2,
+	.read		= qcam_read,
+};
+
+static const struct v4l2_ioctl_ops qcam_ioctl_ops = {
+	.vidioc_querycap    		    = qcam_querycap,
+	.vidioc_g_input      		    = qcam_g_input,
+	.vidioc_s_input      		    = qcam_s_input,
+	.vidioc_enum_input   		    = qcam_enum_input,
+	.vidioc_enum_fmt_vid_cap 	    = qcam_enum_fmt_vid_cap,
+	.vidioc_enum_framesizes		    = qcam_enum_framesizes,
+	.vidioc_g_fmt_vid_cap 		    = qcam_g_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap  		    = qcam_s_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap  	    = qcam_try_fmt_vid_cap,
+	.vidioc_log_status		    = v4l2_ctrl_log_status,
+	.vidioc_subscribe_event		    = v4l2_ctrl_subscribe_event,
+	.vidioc_unsubscribe_event	    = v4l2_event_unsubscribe,
+};
+
+static const struct v4l2_ctrl_ops qcam_ctrl_ops = {
+	.s_ctrl = qcam_s_ctrl,
+};
+
+/* Initialize the QuickCam driver control structure.  This is where
+ * defaults are set for people who don't have a config file.*/
+
+static struct qcam *qcam_init(struct parport *port)
+{
+	struct qcam *qcam;
+	struct v4l2_device *v4l2_dev;
+
+	qcam = kzalloc(sizeof(struct qcam), GFP_KERNEL);
+	if (qcam == NULL)
+		return NULL;
+
+	v4l2_dev = &qcam->v4l2_dev;
+	snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "bw-qcam%d", num_cams);
+
+	if (v4l2_device_register(port->dev, v4l2_dev) < 0) {
+		v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
+		kfree(qcam);
+		return NULL;
+	}
+
+	v4l2_ctrl_handler_init(&qcam->hdl, 3);
+	v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops,
+			  V4L2_CID_BRIGHTNESS, 0, 255, 1, 180);
+	v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops,
+			  V4L2_CID_CONTRAST, 0, 255, 1, 192);
+	v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops,
+			  V4L2_CID_GAMMA, 0, 255, 1, 105);
+	if (qcam->hdl.error) {
+		v4l2_err(v4l2_dev, "couldn't register controls\n");
+		v4l2_ctrl_handler_free(&qcam->hdl);
+		kfree(qcam);
+		return NULL;
+	}
+	qcam->pport = port;
+	qcam->pdev = parport_register_device(port, v4l2_dev->name, NULL, NULL,
+			NULL, 0, NULL);
+	if (qcam->pdev == NULL) {
+		v4l2_err(v4l2_dev, "couldn't register for %s.\n", port->name);
+		v4l2_ctrl_handler_free(&qcam->hdl);
+		kfree(qcam);
+		return NULL;
+	}
+
+	strlcpy(qcam->vdev.name, "Connectix QuickCam", sizeof(qcam->vdev.name));
+	qcam->vdev.v4l2_dev = v4l2_dev;
+	qcam->vdev.ctrl_handler = &qcam->hdl;
+	qcam->vdev.fops = &qcam_fops;
+	qcam->vdev.ioctl_ops = &qcam_ioctl_ops;
+	set_bit(V4L2_FL_USE_FH_PRIO, &qcam->vdev.flags);
+	qcam->vdev.release = video_device_release_empty;
+	video_set_drvdata(&qcam->vdev, qcam);
+
+	mutex_init(&qcam->lock);
+
+	qcam->port_mode = (QC_ANY | QC_NOTSET);
+	qcam->width = 320;
+	qcam->height = 240;
+	qcam->bpp = 4;
+	qcam->transfer_scale = 2;
+	qcam->contrast = 192;
+	qcam->brightness = 180;
+	qcam->whitebal = 105;
+	qcam->top = 1;
+	qcam->left = 14;
+	qcam->mode = -1;
+	qcam->status = QC_PARAM_CHANGE;
+	return qcam;
+}
+
+static int qc_calibrate(struct qcam *q)
+{
+	/*
+	 *	Bugfix by Hanno Mueller hmueller@kabel.de, Mai 21 96
+	 *	The white balance is an individual 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;
+}
+
+static int init_bwqcam(struct parport *port)
+{
+	struct qcam *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);
+	v4l2_ctrl_handler_setup(&qcam->hdl);
+
+	parport_release(qcam->pdev);
+
+	v4l2_info(&qcam->v4l2_dev, "Connectix Quickcam on %s\n", qcam->pport->name);
+
+	if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) {
+		parport_unregister_device(qcam->pdev);
+		kfree(qcam);
+		return -ENODEV;
+	}
+
+	qcams[num_cams++] = qcam;
+
+	return 0;
+}
+
+static void close_bwqcam(struct qcam *qcam)
+{
+	video_unregister_device(&qcam->vdev);
+	v4l2_ctrl_handler_free(&qcam->hdl);
+	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; n < MAX_CAMS && parport[n]; 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 *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(KERN_INFO "Connectix Quickcam max-poll was above 5000. Using 5000.\n");
+		maxpoll = 5000;
+	}
+
+	if (yieldlines < 1) {
+		printk(KERN_INFO "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");
+MODULE_VERSION("0.0.3");