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Add ability to bypass the auto-detection code. It used to be rock solid

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for me, but has gotten a bit flakey in bidirectional parallel port mode.

Fix a bug in bidirectional parallel port transfers, more work is still
needed here (testers welcome).

Minor cleanup.
This commit is contained in:
Paul Traina 1996-02-04 10:02:35 +00:00
parent e1f52c89b4
commit 9e88c75a9f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=13901
1 changed files with 51 additions and 35 deletions
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86
sys/i386/isa/qcam.c
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@ -5,6 +5,8 @@
* This driver is based in part on the Linux QuickCam driver which is
* Copyright (c) 1996, Thomas Davis.
*
* Additional ideas from code written by Michael Chinn.
*
* 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.
@ -102,7 +104,7 @@ static struct kern_devconf kdc_qcam_template = {
&kdc_isa0, /* kdc_parent */
0, /* kdc_parentdata */
DC_UNCONFIGURED, /* kdc_state */
"", /* kdc_description */
"QuickCam video input", /* kdc_description */
DC_CLS_MISC /* class */
};
@ -132,7 +134,7 @@ static d_close_t qcam_close;
static d_read_t qcam_read;
static d_ioctl_t qcam_ioctl;
#define CDEV_MAJOR 73 /* XXX change this! */
#define CDEV_MAJOR 73
static struct cdevsw qcam_cdevsw =
{ qcam_open, qcam_close, qcam_read, nowrite,
@ -229,7 +231,7 @@ qcam_waitfor_bi (u_int port)
{
u_char s1, s2;
write_control(port, 0x28);
write_control(port, 0x26);
READ_STATUS_BYTE_HIGH(port, s1);
write_control(port, 0x2f);
@ -435,7 +437,7 @@ qcam_scan (struct qcam_softc *qs)
}
static void
qcam_registerdev (struct isa_device *id, const char *descr)
qcam_registerdev (struct isa_device *id)
{
struct kern_devconf *kdc = &qcam_softc[id->id_unit].kdc;
@ -443,7 +445,6 @@ qcam_registerdev (struct isa_device *id, const char *descr)
kdc->kdc_unit = id->id_unit;
kdc->kdc_parentdata = id;
kdc->kdc_description = descr;
dev_attach(kdc);
}
@ -465,41 +466,50 @@ qcam_probe (struct isa_device *devp)
return 0;
}
/* write 0's to control and data ports */
write_control(devp->id_iobase, 0x20);
write_control(devp->id_iobase, 0x0b);
write_control(devp->id_iobase, 0x0e);
/*
* 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.
* XXX The probe code is reported to be flakey on parallel port
* cards set up for bidirectional transfers.
* We need to work on this some more, so temporarily,
* allow bit one of the "flags" parameter to bypass this
* check.
*/
last = reg = read_status(devp->id_iobase);
for (i = 0; i < QC_PROBELIMIT; i++) {
if (!(devp->id_flags & 1)) {
write_control(devp->id_iobase, 0x20);
write_control(devp->id_iobase, 0x0b);
write_control(devp->id_iobase, 0x0e);
reg = read_status(devp->id_iobase) & 0xf0;
/*
* 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.
*/
last = reg = read_status(devp->id_iobase);
if (reg != last) /* if we got a toggle, count it */
transitions++;
for (i = 0; i < QC_PROBELIMIT; i++) {
last = reg;
DELAY(100000); /* 100ms */
reg = read_status(devp->id_iobase) & 0xf0;
if (reg != last) /* if we got a toggle, count it */
transitions++;
last = reg;
DELAY(100000); /* 100ms */
}
if (transitions <= QC_PROBECNTLOW || transitions >= QC_PROBECNTHI) {
if (bootverbose)
printf("qcam%d: not found, probed %d, got %d transitions\n",
devp->id_unit, i, transitions);
return 0;
}
}
if (transitions <= QC_PROBECNTLOW || transitions >= QC_PROBECNTHI) {
if (bootverbose)
printf("qcam%d: not found, probed %d, got %d transitions\n",
devp->id_unit, i, transitions);
return 0;
}
qcam_registerdev(devp, "QuickCam video input");
qcam_registerdev(devp);
return 1; /* found */
}
@ -526,9 +536,13 @@ qcam_attach (struct isa_device *devp)
qs->kdc.kdc_state = DC_IDLE;
qs->flags |= QC_ALIVE;
qcam_reset(qs);
qcam_default(qs);
qcam_xferparms(qs);
printf("qcam%d: %sdirectional parallel port\n",
qs->unit, qs->flags & QC_BIDIR_HW ? "bi" : "uni");
#ifdef DEVFS
{
char name[32];
@ -562,6 +576,7 @@ qcam_open (dev_t dev, int flags, int fmt, struct proc *p)
qs->flags |= QC_OPEN;
qs->kdc.kdc_state = DC_BUSY;
return 0;
}
@ -608,7 +623,7 @@ static int
qcam_ioctl (dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
{
struct qcam_softc *qs = (struct qcam_softc *)&qcam_softc[UNIT(dev)];
struct qcam *info= (struct qcam *)data;
struct qcam *info = (struct qcam *)data;
if (!data)
return(EINVAL);
@ -677,8 +692,9 @@ qcam_ioctl (dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
#ifdef ACTUALLY_LKM_NOT_KERNEL
/*
* Loadable QuickCam driver stubs
* XXX This isn't quite working yet, but the template work is done.
* XXX do not attempt to use this driver as a LKM (yet)
* This isn't quite working yet, but the template work is done.
*
* XXX Do not attempt to use this driver as a LKM (yet).
*/
#include <sys/exec.h>
#include <sys/sysent.h>