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

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/*-
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* Copyright (c) 1993, 1994 Charles Hannum.
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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: mms.c,v 1.12 1994/05/05 05:36:45 cgd Exp $
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*/
#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>
#include <sys/select.h>
#include <sys/proc.h>
#include <sys/vnode.h>
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#include <sys/device.h>
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#include <machine/cpu.h>
#include <machine/pio.h>
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#include <machine/mouse.h>
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#include <i386/isa/isavar.h>
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#define MMS_ADDR 0 /* offset for register select */
#define MMS_DATA 1 /* offset for InPort data */
#define MMS_IDENT 2 /* offset for identification register */
#define MMS_NPORTS 4
#define MMS_CHUNK 128 /* chunk size for read */
#define MMS_BSIZE 1020 /* buffer size */
struct mms_softc { /* driver status information */
struct device sc_dev;
struct intrhand sc_ih;
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struct clist sc_q;
struct selinfo sc_rsel;
u_short sc_iobase; /* I/O port base */
u_char sc_state; /* mouse driver state */
#define MMS_OPEN 0x01 /* device is open */
#define MMS_ASLP 0x02 /* waiting for mouse data */
u_char sc_status; /* mouse button status */
int sc_x, sc_y; /* accumulated motion in the X,Y axis */
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};
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int mmsprobe();
void mmsattach();
int mmsintr __P((struct mms_softc *));
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struct cfdriver mmscd = {
NULL, "mms", mmsprobe, mmsattach, DV_TTY, sizeof(struct mms_softc)
};
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#define MMSUNIT(dev) (minor(dev))
int
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mmsprobe(parent, self, aux)
struct device *parent, *self;
void *aux;
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{
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struct isa_attach_args *ia = aux;
u_short iobase = ia->ia_iobase;
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/* Read identification register to see if present */
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if (inb(iobase + MMS_IDENT) != 0xde)
return 0;
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/* Seems it was there; reset. */
outb(iobase + MMS_ADDR, 0x87);
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ia->ia_iosize = MMS_NPORTS;
ia->ia_msize = 0;
return 1;
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}
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void
mmsattach(parent, self, aux)
struct device *parent, *self;
void *aux;
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{
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struct mms_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
u_short iobase = ia->ia_iobase;
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printf("\n");
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/* Other initialization was done by mmsprobe. */
sc->sc_iobase = iobase;
sc->sc_state = 0;
sc->sc_ih.ih_fun = mmsintr;
sc->sc_ih.ih_arg = sc;
sc->sc_ih.ih_level = IPL_NONE;
intr_establish(ia->ia_irq, &sc->sc_ih);
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}
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int
mmsopen(dev, flag)
dev_t dev;
int flag;
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{
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int unit = MMSUNIT(dev);
struct mms_softc *sc;
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if (unit >= mmscd.cd_ndevs)
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return ENXIO;
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sc = mmscd.cd_devs[unit];
if (!sc)
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return ENXIO;
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if (sc->sc_state & MMS_OPEN)
return EBUSY;
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if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
return ENOMEM;
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sc->sc_state |= MMS_OPEN;
sc->sc_status = 0;
sc->sc_x = sc->sc_y = 0;
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/* Enable interrupts. */
outb(sc->sc_iobase + MMS_ADDR, 0x07);
outb(sc->sc_iobase + MMS_DATA, 0x09);
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return 0;
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}
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int
mmsclose(dev, flag)
dev_t dev;
int flag;
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{
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struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
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/* Disable interrupts. */
outb(sc->sc_iobase + MMS_ADDR, 0x87);
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sc->sc_state &= ~MMS_OPEN;
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clfree(&sc->sc_q);
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return 0;
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}
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int
mmsread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
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{
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struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
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int s;
int error;
size_t length;
u_char buffer[MMS_CHUNK];
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/* Block until mouse activity occured. */
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s = spltty();
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while (sc->sc_q.c_cc == 0) {
if (flag & IO_NDELAY) {
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splx(s);
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return EWOULDBLOCK;
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}
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sc->sc_state |= MMS_ASLP;
if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0)) {
sc->sc_state &= ~MMS_ASLP;
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splx(s);
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return error;
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}
}
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splx(s);
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/* Transfer as many chunks as possible. */
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while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
length = min(sc->sc_q.c_cc, uio->uio_resid);
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if (length > sizeof(buffer))
length = sizeof(buffer);
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/* Remove a small chunk from the input queue. */
(void) q_to_b(&sc->sc_q, buffer, length);
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/* Copy the data to the user process. */
if (error = uiomove(buffer, length, uio))
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break;
}
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return error;
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}
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int
mmsioctl(dev, cmd, addr, flag)
dev_t dev;
int cmd;
caddr_t addr;
int flag;
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{
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struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
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struct mouseinfo info;
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int s;
int error;
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switch (cmd) {
case MOUSEIOCREAD:
s = spltty();
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info.status = sc->sc_status;
if (sc->sc_x || sc->sc_y)
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info.status |= MOVEMENT;
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if (sc->sc_x > 127)
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info.xmotion = 127;
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else if (sc->sc_x < -127)
/* Bounding at -127 avoids a bug in XFree86. */
info.xmotion = -127;
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else
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info.xmotion = sc->sc_x;
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if (sc->sc_y > 127)
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info.ymotion = 127;
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else if (sc->sc_y < -127)
info.ymotion = -127;
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else
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info.ymotion = sc->sc_y;
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/* Reset historical information. */
sc->sc_x = sc->sc_y = 0;
sc->sc_status &= ~BUTCHNGMASK;
ndflush(&sc->sc_q, sc->sc_q.c_cc);
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splx(s);
error = copyout(&info, addr, sizeof(struct mouseinfo));
break;
default:
error = EINVAL;
break;
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}
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return error;
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}
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int
mmsintr(sc)
struct mms_softc *sc;
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{
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u_short iobase = sc->sc_iobase;
u_char buttons, changed, status;
char dx, dy;
u_char buffer[5];
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if ((sc->sc_state & MMS_OPEN) == 0)
/* Interrupts are not expected. */
return 0;
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/* Freeze InPort registers (disabling interrupts). */
outb(iobase + MMS_ADDR, 0x07);
outb(iobase + MMS_DATA, 0x29);
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outb(iobase + MMS_ADDR, 0x00);
status = inb(iobase + MMS_DATA);
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if (status & 0x40) {
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outb(iobase + MMS_ADDR, 1);
dx = inb(iobase + MMS_DATA);
dx = (dx == -128) ? -127 : dx;
outb(iobase + MMS_ADDR, 2);
dy = inb(iobase + MMS_DATA);
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dy = (dy == -128) ? 127 : -dy;
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} else
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dx = dy = 0;
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/* Unfreeze InPort registers (reenabling interrupts). */
outb(iobase + MMS_ADDR, 0x07);
outb(iobase + MMS_DATA, 0x09);
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buttons = status & BUTSTATMASK;
changed = status & BUTCHNGMASK;
sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
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if (dx || dy || changed) {
/* Update accumulated movements. */
sc->sc_x += dx;
sc->sc_y += dy;
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/* Add this event to the queue. */
buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
buffer[1] = dx;
buffer[2] = dy;
buffer[3] = buffer[4] = 0;
(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
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if (sc->sc_state & MMS_ASLP) {
sc->sc_state &= ~MMS_ASLP;
wakeup((caddr_t)sc);
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}
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selwakeup(&sc->sc_rsel);
}
return -1;
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}
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int
mmsselect(dev, rw, p)
dev_t dev;
int rw;
struct proc *p;
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{
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struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
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int s;
int ret;
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if (rw == FWRITE)
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return 0;
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s = spltty();
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if (!sc->sc_q.c_cc) {
selrecord(p, &sc->sc_rsel);
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ret = 0;
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} else
ret = 1;
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splx(s);
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return ret;
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}