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freebsd/sys/i386/isa/qcamio.c

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/*
* Connectix QuickCam parallel-port camera video capture driver.
* Copyright (c) 1996, Paul Traina.
*
* This driver is based in part on work
* Copyright (c) 1996, Thomas Davis.
*
* Additional ideas from code written by Michael Chinn and Nelson Minar.
*
* QuickCam(TM) is a registered trademark of Connectix Inc.
* Use this driver at your own risk, it is not warranted by
* Connectix or the authors.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef NQCAM
#include "qcam.h" /* this file defines NQCAM _only_ */
#endif
#if NQCAM > 0
#if defined(__FreeBSD__) || defined(__NetBSD__)
#include <sys/param.h>
#include <machine/cpufunc.h>
#ifdef KERNEL
#include <sys/systm.h>
#include <machine/clock.h>
#include <machine/qcam.h>
#else /* user mode version of driver */
#include <unistd.h>
#include <stdio.h>
#include "qcam.h"
#endif /* KERNEL */
#endif /* FreeBSD or NetBSD */
#ifdef bsdi
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/device.h>
#include "qcam.h"
#endif /* bsdi */
#ifdef __linux__
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <asm/io.h>
#include "qcam-linux.h"
#include "qcam.h"
#endif /* __linux__ */
#ifdef _SCO_DS
#include <limits.h>
#include <errno.h>
#include <sys/types.h>
#include "qcam-sco.h"
#include "qcam.h"
#endif
#ifdef __FreeBSD__
#include <i386/isa/qcamreg.h>
#include <i386/isa/qcamdefs.h>
#include <machine/limits.h> /* XXX for bogus UCHAR_MAX checks -
* the types are all u_char so the
* tests are null */
#else
#include "qcamreg.h"
#include "qcamdefs.h"
#endif
/*
* There should be _NO_ operating system dependant code or definitions
* past this point.
*/
static const u_char qcam_zoommode[3][3] = {
{ QC_XFER_WIDE, QC_XFER_WIDE, QC_XFER_WIDE },
{ QC_XFER_NARROW, QC_XFER_WIDE, QC_XFER_WIDE },
{ QC_XFER_TIGHT, QC_XFER_NARROW, QC_XFER_WIDE }
};
static int qcam_timeouts;
#ifdef QCAM_GRAB_STATS
#define STATBUFSIZE (QC_MAXFRAMEBUFSIZE*2+50)
static u_short qcam_rsbhigh[STATBUFSIZE];
static u_short qcam_rsblow[STATBUFSIZE];
static u_short *qcam_rsbhigh_p = qcam_rsbhigh;
static u_short *qcam_rsblow_p = qcam_rsblow;
static u_short *qcam_rsbhigh_end = &qcam_rsbhigh[STATBUFSIZE];
static u_short *qcam_rsblow_end = &qcam_rsblow[STATBUFSIZE];
#define STATHIGH(T) \
if (qcam_rsbhigh_p < qcam_rsbhigh_end) \
*qcam_rsbhigh_p++ = ((T) - timeout); \
if (!timeout) qcam_timeouts++;
#define STATLOW(T) \
if (qcam_rsblow_p < qcam_rsblow_end) \
*qcam_rsblow_p++ = ((T) - timeout); \
if (!timeout) qcam_timeouts++;
#else
#define STATHIGH(T) if (!timeout) qcam_timeouts++;
#define STATLOW(T) if (!timeout) qcam_timeouts++;
#endif /* QCAM_GRAB_STATS */
#define READ_STATUS_BYTE_HIGH(P, V, T) { \
u_short timeout = (T); \
do { (V) = read_status((P)); \
} while (!(((V) & 0x08)) && --timeout); STATHIGH(T) \
}
#define READ_STATUS_BYTE_LOW(P, V, T) { \
u_short timeout = (T); \
do { (V) = read_status((P)); \
} while (((V) & 0x08) && --timeout); STATLOW(T) \
}
#define READ_DATA_WORD_HIGH(P, V, T) { \
u_int timeout = (T); \
do { (V) = read_data_word((P)); \
} while (!((V) & 0x01) && --timeout); STATHIGH(T) \
}
#define READ_DATA_WORD_LOW(P, V, T) { \
u_int timeout = (T); \
do { (V) = read_data_word((P)); \
} while (((V) & 0x01) && --timeout); STATLOW(T) \
}
inline static int
sendbyte (u_int port, int value, int sdelay)
{
u_char s1, s2;
write_data(port, value);
if (sdelay) {
DELAY(sdelay);
write_data(port, value);
}
write_control(port, QC_CTL_HIGHNIB);
READ_STATUS_BYTE_HIGH(port, s1, QC_TIMEOUT_CMD);
write_control(port, QC_CTL_LOWNIB);
READ_STATUS_BYTE_LOW(port, s2, QC_TIMEOUT_CMD);
return (s1 & 0xf0) | (s2 >> 4);
}
static int
send_command (struct qcam_softc *qs, int cmd, int value)
{
if (sendbyte(qs->iobase, cmd, qs->exposure) != cmd)
return 1;
if (sendbyte(qs->iobase, value, qs->exposure) != value)
return 1;
return 0; /* success */
}
static int
send_xfermode (struct qcam_softc *qs, int value)
{
if (sendbyte(qs->iobase, QC_XFERMODE, qs->exposure) != QC_XFERMODE)
return 1;
if (sendbyte(qs->iobase, value, qs->exposure) != value)
return 1;
return 0;
}
void
qcam_reset (struct qcam_softc *qs)
{
register u_int iobase = qs->iobase;
register u_char result;
write_control(iobase, 0x20);
write_data (iobase, 0x75);
result = read_data(iobase);
if ((result != 0x75) && !(qs->flags & QC_FORCEUNI))
qs->flags |= QC_BIDIR_HW; /* bidirectional parallel port */
else
qs->flags &= ~QC_BIDIR_HW;
write_control(iobase, 0x0b);
DELAY(250);
write_control(iobase, QC_CTL_LOWNIB);
DELAY(250);
}
static int
qcam_waitfor_bi (u_int port)
{
u_char s1, s2;
write_control(port, QC_CTL_HIGHWORD);
READ_STATUS_BYTE_HIGH(port, s1, QC_TIMEOUT_INIT);
write_control(port, QC_CTL_LOWWORD);
READ_STATUS_BYTE_LOW(port, s2, QC_TIMEOUT);
return (s1 & 0xf0) | (s2 >> 4);
}
/*
* The pixels are read in 16 bits at a time, and we get 3 valid pixels per
* 16-bit read. The encoding format looks like this:
*
* |---- status reg -----| |----- data reg ------|
* 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
* 3 3 3 3 2 x x x 2 2 2 1 1 1 1 R
*
* 1 = left pixel R = camera ready
* 2 = middle pixel x = unknown/unused?
* 3 = right pixel
*
* XXX do not use this routine yet! It does not work.
* Nelson believes that even though 6 pixels are read in per 2 words,
* only the 1 & 2 pixels from the first word are correct. This seems
* bizzare, more study is needed here.
*/
#define DECODE_WORD_BI4BPP(P, W) \
*(P)++ = 15 - (((W) >> 12) & 0x0f); \
*(P)++ = 15 - ((((W) >> 8) & 0x08) | (((W) >> 5) & 0x07)); \
*(P)++ = 15 - (((W) >> 1) & 0x0f);
static void
qcam_bi_4bit (struct qcam_softc *qs)
{
u_char *p;
u_int port;
u_short word;
port = qs->iobase; /* for speed */
qcam_waitfor_bi(port);
/*
* Unlike the other routines, this routine has NOT be interleaved
* yet because we don't have the algorythm for 4bbp down tight yet,
* so why add to the confusion?
*/
for (p = qs->buffer; p < qs->buffer_end; ) {
write_control(port, QC_CTL_HIGHWORD);
READ_DATA_WORD_HIGH(port, word, QC_TIMEOUT);
DECODE_WORD_BI4BPP(p, word);
write_control(port, QC_CTL_LOWWORD);
READ_DATA_WORD_HIGH(port, word, QC_TIMEOUT);
DECODE_WORD_BI4BPP(p, word);
}
}
/*
* The pixels are read in 16 bits at a time, 12 of those bits contain
* pixel information, the format looks like this:
*
* |---- status reg -----| |----- data reg ------|
* 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
* 2 2 2 2 2 x x x 2 1 1 1 1 1 1 R
*
* 1 = left pixel R = camera ready
* 2 = right pixel x = unknown/unused?
*/
#define DECODE_WORD_BI6BPP(P, W) \
*(P)++ = 63 - (((W) >> 1) & 0x3f); \
*(P)++ = 63 - ((((W) >> 10) & 0x3e) | (((W) >> 7) & 0x01));
static void
qcam_bi_6bit (struct qcam_softc *qs)
{
u_char *p;
u_short hi, low;
u_int port;
port = qs->iobase; /* for speed */
qcam_waitfor_bi(port);
/*
* This was interleaved before, but I cut it back to the simple
* mode so that it's easier for people to play with it. A quick
* unrolling of the loop coupled with interleaved decoding and I/O
* should get us a slight CPU bonus later.
*/
for (p = qs->buffer; p < qs->buffer_end; ) {
write_control(port, QC_CTL_HIGHWORD);
READ_DATA_WORD_HIGH(port, hi, QC_TIMEOUT);
DECODE_WORD_BI6BPP(p, hi);
write_control(port, QC_CTL_LOWWORD);
READ_DATA_WORD_LOW(port, low, QC_TIMEOUT);
DECODE_WORD_BI6BPP(p, low);
}
}
/*
* We're doing something tricky here that makes this routine a little
* more complex than you would expect. We're interleaving the high
* and low nibble reads with the math required for nibble munging.
* This should allow us to use the "free" time while we're waiting for
* the next nibble to come ready to do any data conversion operations.
*/
#define DECODE_WORD_UNI4BPP(P, W) \
*(P)++ = 15 - ((W) >> 4);
static void
qcam_uni_4bit (struct qcam_softc *qs)
{
u_char *p, *end, hi, low;
u_int port;
port = qs->iobase;
p = qs->buffer;
end = qs->buffer_end - 1;
/* request and wait for first nibble */
write_control(port, QC_CTL_HIGHNIB);
READ_STATUS_BYTE_HIGH(port, hi, QC_TIMEOUT_INIT);
/* request second nibble, munge first nibble while waiting, read 2nd */
write_control(port, QC_CTL_LOWNIB);
DECODE_WORD_UNI4BPP(p, hi);
READ_STATUS_BYTE_LOW(port, low, QC_TIMEOUT);
while (p < end) {
write_control(port, QC_CTL_HIGHNIB);
DECODE_WORD_UNI4BPP(p, low);
READ_STATUS_BYTE_HIGH(port, hi, QC_TIMEOUT);
write_control(port, QC_CTL_LOWNIB);
DECODE_WORD_UNI4BPP(p, hi);
READ_STATUS_BYTE_LOW(port, low, QC_TIMEOUT);
}
DECODE_WORD_UNI4BPP(p, low);
}
/*
* If you treat each pair of nibble operations as pulling in a byte, you
* end up with a byte stream that looks like this:
*
* msb lsb
* 2 2 1 1 1 1 1 1
* 2 2 2 2 3 3 3 3
* 3 3 4 4 4 4 4 4
*/
static void
qcam_uni_6bit (struct qcam_softc *qs)
{
u_char *p;
u_int port;
u_char word1, word2, word3, hi, low;
port = qs->iobase;
/*
* This routine has been partially interleaved... we can do a better
* job, but for right now, I've deliberately kept it less efficient
* so we can play with decoding without hurting peoples brains.
*/
for (p = qs->buffer; p < qs->buffer_end; ) {
write_control(port, QC_CTL_HIGHNIB);
READ_STATUS_BYTE_HIGH(port, hi, QC_TIMEOUT_INIT);
write_control(port, QC_CTL_LOWNIB);
READ_STATUS_BYTE_LOW(port, low, QC_TIMEOUT);
write_control(port, QC_CTL_HIGHNIB);
word1 = (hi & 0xf0) | (low >>4);
READ_STATUS_BYTE_HIGH(port, hi, QC_TIMEOUT);
write_control(port, QC_CTL_LOWNIB);
*p++ = 63 - (word1 >> 2);
READ_STATUS_BYTE_LOW(port, low, QC_TIMEOUT);
write_control(port, QC_CTL_HIGHNIB);
word2 = (hi & 0xf0) | (low >> 4);
READ_STATUS_BYTE_HIGH(port, hi, QC_TIMEOUT);
write_control(port, QC_CTL_LOWNIB);
*p++ = 63 - (((word1 & 0x03) << 4) | (word2 >> 4));
READ_STATUS_BYTE_LOW(port, low, QC_TIMEOUT);
word3 = (hi & 0xf0) | (low >> 4);
*p++ = 63 - (((word2 & 0x0f) << 2) | (word3 >> 6));
*p++ = 63 - (word3 & 0x3f);
}
/* XXX this is something xfqcam does, doesn't make sense to me,
but we don't see timeoutes here... ? */
write_control(port, QC_CTL_LOWNIB);
READ_STATUS_BYTE_LOW(port, word1, QC_TIMEOUT);
write_control(port, QC_CTL_HIGHNIB);
READ_STATUS_BYTE_LOW(port, word1, QC_TIMEOUT);
}
static void
qcam_xferparms (struct qcam_softc *qs)
{
int bidir;
qs->xferparms = 0;
bidir = (qs->flags & QC_BIDIR_HW);
if (bidir)
qs->xferparms |= QC_XFER_BIDIR;
if (qcam_debug)
printf("qcam%d: %dbpp %sdirectional scan mode selected\n",
qs->unit, qs->bpp, bidir ? "bi" : "uni");
if (qs->bpp == 6) {
qs->xferparms |= QC_XFER_6BPP;
qs->scanner = bidir ? qcam_bi_6bit : qcam_uni_6bit;
} else {
qs->scanner = bidir ? qcam_bi_4bit : qcam_uni_4bit;
}
if (qs->x_size > 160 || qs->y_size > 120) {
qs->xferparms |= qcam_zoommode[0][qs->zoom];
} else if (qs->x_size > 80 || qs->y_size > 60) {
qs->xferparms |= qcam_zoommode[1][qs->zoom];
} else
qs->xferparms |= qcam_zoommode[2][qs->zoom];
}
static void
qcam_init (struct qcam_softc *qs)
{
int x_size = (qs->bpp == 4) ? qs->x_size / 2 : qs->x_size / 4;
qcam_xferparms(qs);
send_command(qs, QC_BRIGHTNESS, qs->brightness);
send_command(qs, QC_BRIGHTNESS, 1);
send_command(qs, QC_BRIGHTNESS, 1);
send_command(qs, QC_BRIGHTNESS, qs->brightness);
send_command(qs, QC_BRIGHTNESS, qs->brightness);
send_command(qs, QC_BRIGHTNESS, qs->brightness);
send_command(qs, QC_YSIZE, qs->y_size);
send_command(qs, QC_XSIZE, x_size);
send_command(qs, QC_YORG, qs->y_origin);
send_command(qs, QC_XORG, qs->x_origin);
send_command(qs, QC_CONTRAST, qs->contrast);
send_command(qs, QC_WHITEBALANCE, qs->whitebalance);
if (qs->buffer)
qs->buffer_end = qs->buffer +
min((qs->x_size*qs->y_size), QC_MAXFRAMEBUFSIZE);
qs->init_req = 0;
}
int
qcam_scan (struct qcam_softc *qs)
{
int timeouts;
#ifdef QCAM_GRAB_STATS
bzero(qcam_rsbhigh, sizeof(qcam_rsbhigh));
bzero(qcam_rsblow, sizeof(qcam_rsblow));
qcam_rsbhigh_p = qcam_rsbhigh;
qcam_rsblow_p = qcam_rsblow;
#endif
timeouts = qcam_timeouts;
if (qs->init_req)
qcam_init(qs);
if (send_xfermode(qs, qs->xferparms))
return 1;
if (qcam_debug && (timeouts != qcam_timeouts))
printf("qcam%d: %d timeouts during init\n", qs->unit,
qcam_timeouts - timeouts);
timeouts = qcam_timeouts;
if (qs->scanner)
(*qs->scanner)(qs);
else
return 1;
if (qcam_debug && (timeouts != qcam_timeouts))
printf("qcam%d: %d timeouts during scan\n", qs->unit,
qcam_timeouts - timeouts);
write_control(qs->iobase, 0x0f);
return 0; /* success */
}
void
qcam_default (struct qcam_softc *qs)
{
qs->contrast = QC_DEF_CONTRAST;
qs->brightness = QC_DEF_BRIGHTNESS;
qs->whitebalance = QC_DEF_WHITEBALANCE;
qs->x_size = QC_DEF_XSIZE;
qs->y_size = QC_DEF_YSIZE;
qs->x_origin = QC_DEF_XORG;
qs->y_origin = QC_DEF_YORG;
qs->bpp = QC_DEF_BPP;
qs->zoom = QC_DEF_ZOOM;
qs->exposure = QC_DEF_EXPOSURE;
}
int
qcam_ioctl_get (struct qcam_softc *qs, struct qcam *info)
{
info->qc_version = QC_IOCTL_VERSION;
info->qc_xsize = qs->x_size;
info->qc_ysize = qs->y_size;
info->qc_xorigin = qs->x_origin;
info->qc_yorigin = qs->y_origin;
info->qc_bpp = qs->bpp;
info->qc_zoom = qs->zoom;
info->qc_exposure = qs->exposure;
info->qc_brightness = qs->brightness;
info->qc_whitebalance = qs->whitebalance;
info->qc_contrast = qs->contrast;
return 0; /* success */
}
int
qcam_ioctl_set (struct qcam_softc *qs, struct qcam *info)
{
/*
* sanity check parameters passed in by user
* we're extra paranoid right now because the API
* is in flux
*/
if (info->qc_xsize > QC_MAX_XSIZE ||
info->qc_ysize > QC_MAX_YSIZE ||
info->qc_xorigin > QC_MAX_XSIZE ||
info->qc_yorigin > QC_MAX_YSIZE ||
(info->qc_bpp != 4 && info->qc_bpp != 6) ||
info->qc_zoom > QC_ZOOM_200 ||
info->qc_brightness > UCHAR_MAX ||
info->qc_whitebalance > UCHAR_MAX ||
info->qc_contrast > UCHAR_MAX)
return 1; /* failure */
/* version check */
if (info->qc_version != QC_IOCTL_VERSION)
return 1; /* failure */
qs->x_size = info->qc_xsize;
qs->y_size = info->qc_ysize;
qs->x_origin = info->qc_xorigin;
qs->y_origin = info->qc_yorigin;
qs->bpp = info->qc_bpp;
qs->zoom = info->qc_zoom;
qs->exposure = info->qc_exposure;
qs->brightness = info->qc_brightness;
qs->whitebalance = info->qc_whitebalance;
qs->contrast = info->qc_contrast;
/* request initialization before next scan pass */
qs->init_req = 1;
return 0; /* success */
}
#ifndef QCAM_INVASIVE_SCAN
/*
* Attempt a non-destructive probe for the QuickCam.
* Current models appear to toggle the upper 4 bits of
* the status register at approximately 5-10 Hz.
*
* Be aware that this isn't the way that Connectix detects the
* camera (they send a reset and try to handshake), but this
* way is safe.
*/
int
qcam_detect (u_int port)
{
int i, transitions = 0;
u_char reg, last;
write_control(port, 0x20);
write_control(port, 0x0b);
write_control(port, 0x0e);
last = reg = read_status(port);
for (i = 0; i < QC_PROBELIMIT; i++) {
reg = read_status(port) & 0xf0;
if (reg != last) /* if we got a toggle, count it */
transitions++;
last = reg;
LONGDELAY(100000); /* 100ms */
}
return transitions >= QC_PROBECNTLOW &&
transitions <= QC_PROBECNTHI;
}
#else
/*
* This form of probing for the camera can cause garbage to show
* up on your printers if they're plugged in instead. However,
* some folks have a problem with the nondestructive scan when
* using EPP/ECP parallel ports.
*
* Try to send down a brightness command, if we succeed, we've
* got a camera on the remote side.
*/
int
qcam_detect (u_int port)
{
write_control(port, 0x20);
write_data(port, 0x75);
read_data(port);
write_control(port, 0x0b);
DELAY(250);
write_control(port, 0x0e);
DELAY(250);
if (sendbyte(port, QC_BRIGHTNESS, QC_DEF_EXPOSURE) != QC_BRIGHTNESS)
return 0; /* failure */
return (sendbyte(port, 1, QC_DEF_EXPOSURE) == 1);
}
#endif
#endif /* NQCAM */
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