NetBSD/sys/arch/i386/isa/lms.c

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/*-
* Copyright (c) 1992, 1993 Erik Forsberg.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY ``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 I 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.
*
* $Id: lms.c,v 1.7 1993/12/20 09:06:17 mycroft Exp $
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*/
#include "lms.h"
#if NLMS > 0
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/file.h>
#ifdef NetBSD
#include <sys/select.h>
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#endif
#include <sys/proc.h>
#include <sys/vnode.h>
#include <machine/mouse.h>
#include <machine/pio.h>
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#include <i386/isa/isa_device.h>
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#define DATA 0 /* Offset for data port, read-only */
#define SIGN 1 /* Offset for signature port, read-write */
#define INTR 2 /* Offset for interrupt port, read-only */
#define CNTRL 2 /* Offset for control port, write-only */
#define CONFIG 3 /* for configuration port, read-write */
#define LMSUNIT(dev) (minor(dev) >> 1)
#ifndef min
#define min(x,y) (x < y ? x : y)
#endif min
int lmsprobe (struct isa_device *);
int lmsattach (struct isa_device *);
static int lmsaddr[NLMS]; /* Base I/O port addresses per unit */
#define MSBSZ 1024 /* Output queue size (pwr of 2 is best) */
struct ringbuf {
int count, first, last;
char queue[MSBSZ];
};
static struct lms_softc { /* Driver status information */
struct ringbuf inq; /* Input queue */
#ifdef NetBSD
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struct selinfo rsel;
#else
pid_t rsel; /* Process selecting for Input */
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#endif
unsigned char state; /* Mouse driver state */
unsigned char status; /* Mouse button status */
unsigned char button; /* Previous mouse button status bits */
int x, y; /* accumulated motion in the X,Y axis */
} lms_softc[NLMS];
#define OPEN 1 /* Device is open */
#define ASLP 2 /* Waiting for mouse data */
struct isa_driver lmsdriver = { lmsprobe, lmsattach, "lms" };
int lmsprobe(struct isa_device *dvp)
{
int ioport = dvp->id_iobase;
int val;
/* Configure and check for port present */
outb(ioport+CONFIG, 0x91);
DELAY(10);
outb(ioport+SIGN, 0x0C);
DELAY(10);
val = inb(ioport+SIGN);
DELAY(10);
outb(ioport+SIGN, 0x50);
/* Check if something is out there */
if (val == 0x0C && inb(ioport+SIGN) == 0x50)
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return(4);
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/* Not present */
return(0);
}
int lmsattach(struct isa_device *dvp)
{
int unit = dvp->id_unit;
int ioport = dvp->id_iobase;
struct lms_softc *sc = &lms_softc[unit];
/* Save I/O base address */
lmsaddr[unit] = ioport;
/* Disable mouse interrupts */
outb(ioport+CNTRL, 0x10);
/* Setup initial state */
sc->state = 0;
/* Done */
return(0);
}
int lmsopen(dev_t dev, int flag, int fmt, struct proc *p)
{
int unit = LMSUNIT(dev);
struct lms_softc *sc;
int ioport;
/* Validate unit number */
if (unit >= NLMS)
return(ENXIO);
/* Get device data */
sc = &lms_softc[unit];
ioport = lmsaddr[unit];
/* If device does not exist */
if (ioport == 0)
return(ENXIO);
/* Disallow multiple opens */
if (sc->state & OPEN)
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return(EBUSY);
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/* Initialize state */
sc->state |= OPEN;
#ifdef NetBSD
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sc->rsel.si_pid = 0;
sc->rsel.si_coll = 0;
#else
sc->rsel = 0;
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#endif
sc->status = 0;
sc->button = 0;
sc->x = 0;
sc->y = 0;
/* Allocate and initialize a ring buffer */
sc->inq.count = sc->inq.first = sc->inq.last = 0;
/* Enable Bus Mouse interrupts */
outb(ioport+CNTRL, 0);
/* Successful open */
return(0);
}
int lmsclose(dev_t dev, int flag, int fmt, struct proc *p)
{
int unit, ioport;
struct lms_softc *sc;
/* Get unit and associated info */
unit = LMSUNIT(dev);
sc = &lms_softc[unit];
ioport = lmsaddr[unit];
/* Disable further mouse interrupts */
outb(ioport+CNTRL, 0x10);
/* Complete the close */
sc->state &= ~OPEN;
/* close is almost always successful */
return(0);
}
int lmsread(dev_t dev, struct uio *uio, int flag)
{
int s;
int error = 0; /* keep compiler quiet, even though initialisation
is unnecessary */
unsigned length;
struct lms_softc *sc;
unsigned char buffer[100];
/* Get device information */
sc = &lms_softc[LMSUNIT(dev)];
/* Block until mouse activity occured */
s = spltty();
while (sc->inq.count == 0) {
if (minor(dev) & 0x1) {
splx(s);
return(EWOULDBLOCK);
}
sc->state |= ASLP;
error = tsleep((caddr_t)sc, PZERO | PCATCH, "lmsrea", 0);
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if (error != 0) {
splx(s);
return(error);
}
}
/* Transfer as many chunks as possible */
while (sc->inq.count > 0 && uio->uio_resid > 0) {
length = min(sc->inq.count, uio->uio_resid);
if (length > sizeof(buffer))
length = sizeof(buffer);
/* Remove a small chunk from input queue */
if (sc->inq.first + length >= MSBSZ) {
bcopy(&sc->inq.queue[sc->inq.first],
buffer, MSBSZ - sc->inq.first);
bcopy(sc->inq.queue, &buffer[MSBSZ-sc->inq.first],
length - (MSBSZ - sc->inq.first));
}
else
bcopy(&sc->inq.queue[sc->inq.first], buffer, length);
sc->inq.first = (sc->inq.first + length) % MSBSZ;
sc->inq.count -= length;
/* Copy data to user process */
error = uiomove(buffer, length, uio);
if (error)
break;
}
sc->x = sc->y = 0;
/* Allow interrupts again */
splx(s);
return(error);
}
int lmsioctl(dev_t dev, caddr_t addr, int cmd, int flag, struct proc *p)
{
struct lms_softc *sc;
struct mouseinfo info;
int s, error;
/* Get device information */
sc = &lms_softc[LMSUNIT(dev)];
/* Perform IOCTL command */
switch (cmd) {
case MOUSEIOCREAD:
/* Don't modify info while calculating */
s = spltty();
/* Build mouse status octet */
info.status = sc->status;
if (sc->x || sc->y)
info.status |= MOVEMENT;
/* Encode X and Y motion as good as we can */
if (sc->x > 127)
info.xmotion = 127;
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else if (sc->x < -127)
info.xmotion = -127;
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else
info.xmotion = sc->x;
if (sc->y > 127)
info.ymotion = 127;
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else if (sc->y < -127)
info.ymotion = -127;
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else
info.ymotion = sc->y;
/* Reset historical information */
sc->x = 0;
sc->y = 0;
sc->status &= ~BUTCHNGMASK;
/* Allow interrupts and copy result buffer */
splx(s);
error = copyout(&info, addr, sizeof(struct mouseinfo));
break;
default:
error = EINVAL;
break;
}
/* Return error code */
return(error);
}
void lmsintr(unit)
int unit;
{
struct lms_softc *sc = &lms_softc[unit];
int ioport = lmsaddr[unit];
char hi, lo, dx, dy, buttons, changed;
outb(ioport+CNTRL, 0xAB);
hi = inb(ioport+DATA) & 15;
outb(ioport+CNTRL, 0x90);
lo = inb(ioport+DATA) & 15;
dx = (hi << 4) | lo;
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dx = (dx == -128) ? -127 : dx;
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outb(ioport+CNTRL, 0xF0);
hi = inb(ioport+DATA);
outb(ioport+CNTRL, 0xD0);
lo = inb(ioport+DATA);
outb(ioport+CNTRL, 0);
dy = ((hi & 15) << 4) | (lo & 15);
dy = (dy == -128) ? 127 : -dy;
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buttons = (~hi >> 5) & 7;
changed = buttons ^ sc->button;
sc->button = buttons;
sc->status = buttons | (sc->status & ~BUTSTATMASK) | (changed << 3);
/* Update accumulated movements */
sc->x += dx;
sc->y += dy;
/* If device in use and a change occurred... */
if (sc->state & OPEN && (dx || dy || changed)) {
sc->inq.queue[sc->inq.last++] = 0x80 | (buttons ^ BUTSTATMASK);
sc->inq.queue[sc->inq.last++ % MSBSZ] = dx;
sc->inq.queue[sc->inq.last++ % MSBSZ] = dy;
sc->inq.queue[sc->inq.last++ % MSBSZ] = 0;
sc->inq.queue[sc->inq.last++ % MSBSZ] = 0;
sc->inq.last = sc->inq.last % MSBSZ;
sc->inq.count += 5;
if (sc->state & ASLP) {
sc->state &= ~ASLP;
wakeup((caddr_t)sc);
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}
#ifdef NetBSD
selwakeup(&sc->rsel);
#else
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if (sc->rsel) {
selwakeup(sc->rsel, 0);
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sc->rsel = 0;
}
#endif
}
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}
int lmsselect(dev_t dev, int rw, struct proc *p)
{
int s, ret;
struct lms_softc *sc = &lms_softc[LMSUNIT(dev)];
/* Silly to select for output */
if (rw == FWRITE)
return(0);
/* Return true if a mouse event available */
s = spltty();
if (sc->inq.count)
ret = 1;
else {
#ifdef NetBSD
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selrecord(p, &sc->rsel);
#else
sc->rsel = p->p_pid;
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#endif
ret = 0;
}
splx(s);
return(ret);
}
#endif