423 lines
8.3 KiB
C
423 lines
8.3 KiB
C
/*-
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* Copyright (c) 1992, 1993 Erik Forsberg.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* THIS SOFTWARE IS PROVIDED BY ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL I BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: mms.c,v 1.6 1993/08/02 17:52:35 mycroft Exp $
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*/
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#include "mms.h"
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#if NMMS > 0
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#include "param.h"
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#include "kernel.h"
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#include "systm.h"
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#include "buf.h"
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#include "malloc.h"
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#include "ioctl.h"
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#include "tty.h"
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#include "file.h"
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#ifdef NetBSD
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#include "select.h"
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#endif
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#include "proc.h"
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#include "vnode.h"
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#include "i386/include/mouse.h"
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#include "i386/include/pio.h" /* Julian's fast IO macros */
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#include "i386/isa/isa_device.h"
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#define ADDR 0 /* Offset for register select */
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#define DATA 1 /* Offset for InPort data */
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#define IDENT 2 /* Offset for identification register */
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#define MMSUNIT(dev) (minor(dev) >> 1)
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#ifndef min
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#define min(x,y) (x < y ? x : y)
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#endif min
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int mmsprobe (struct isa_device *);
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int mmsattach (struct isa_device *);
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static int mmsaddr[NMMS]; /* Base I/O port addresses per unit */
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#define MSBSZ 1024 /* Output queue size (pwr of 2 is best) */
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struct ringbuf {
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int count, first, last;
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char queue[MSBSZ];
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};
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static struct mms_softc { /* Driver status information */
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struct ringbuf inq; /* Input queue */
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#ifdef NetBSD
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struct selinfo rsel;
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#else
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pid_t rsel; /* Process selecting for Input */
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#endif
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unsigned char state; /* Mouse driver state */
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unsigned char status; /* Mouse button status */
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int x, y; /* accumulated motion in the X,Y axis */
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} mms_softc[NMMS];
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#define OPEN 1 /* Device is open */
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#define ASLP 2 /* Waiting for mouse data */
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struct isa_driver mmsdriver = { mmsprobe, mmsattach, "mms" };
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int mmsprobe(struct isa_device *dvp)
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{
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int ioport = dvp->id_iobase;
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/* Read identification register to see if present */
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if (inb(ioport+IDENT) != 0xDE)
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return(0);
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/* Seems it was there; reset */
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outb(ioport+ADDR, 0x87);
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return(4);
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}
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int mmsattach(struct isa_device *dvp)
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{
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int unit = dvp->id_unit;
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int ioport = dvp->id_iobase;
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struct mms_softc *sc = &mms_softc[unit];
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/* Save I/O base address */
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mmsaddr[unit] = ioport;
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/* Setup initial state */
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sc->state = 0;
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/* Done */
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return(0);
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}
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int mmsopen(dev_t dev, int flag, int fmt, struct proc *p)
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{
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int unit = MMSUNIT(dev);
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struct mms_softc *sc;
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int ioport;
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/* Validate unit number */
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if (unit >= NMMS)
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return(ENXIO);
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/* Get device data */
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sc = &mms_softc[unit];
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ioport = mmsaddr[unit];
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/* If device does not exist */
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if (ioport == 0)
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return(ENXIO);
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/* Disallow multiple opens */
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if (sc->state & OPEN)
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return(EBUSY);
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/* Initialize state */
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sc->state |= OPEN;
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#ifdef NetBSD
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sc->rsel.si_pid = 0;
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sc->rsel.si_coll = 0;
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#else
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sc->rsel = 0;
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#endif
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sc->status = 0;
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sc->x = 0;
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sc->y = 0;
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/* Allocate and initialize a ring buffer */
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sc->inq.count = sc->inq.first = sc->inq.last = 0;
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/* Setup Bus Mouse */
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outb(ioport+ADDR, 7);
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outb(ioport+DATA, 0x09);
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/* Successful open */
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return(0);
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}
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int mmsclose(dev_t dev, int flag, int fmt, struct proc *p)
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{
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int unit, ioport;
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struct mms_softc *sc;
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/* Get unit and associated info */
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unit = MMSUNIT(dev);
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sc = &mms_softc[unit];
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ioport = mmsaddr[unit];
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/* Reset Bus Mouse */
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outb(ioport+ADDR, 0x87);
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/* Complete the close */
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sc->state &= ~OPEN;
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/* close is almost always successful */
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return(0);
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}
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int mmsread(dev_t dev, struct uio *uio, int flag)
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{
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int s, error = 0;
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unsigned length;
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struct mms_softc *sc;
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unsigned char buffer[100];
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/* Get device information */
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sc = &mms_softc[MMSUNIT(dev)];
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/* Block until mouse activity occured */
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s = spltty();
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while (sc->inq.count == 0) {
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if (minor(dev) & 0x1) {
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splx(s);
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return(EWOULDBLOCK);
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}
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sc->state |= ASLP;
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error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0);
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if (error != 0) {
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splx(s);
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return(error);
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}
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}
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/* Transfer as many chunks as possible */
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while (sc->inq.count > 0 && uio->uio_resid > 0) {
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length = min(sc->inq.count, uio->uio_resid);
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if (length > sizeof(buffer))
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length = sizeof(buffer);
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/* Remove a small chunk from input queue */
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if (sc->inq.first + length >= MSBSZ) {
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bcopy(&sc->inq.queue[sc->inq.first],
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buffer, MSBSZ - sc->inq.first);
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bcopy(sc->inq.queue, &buffer[MSBSZ-sc->inq.first],
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length - (MSBSZ - sc->inq.first));
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}
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else
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bcopy(&sc->inq.queue[sc->inq.first], buffer, length);
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sc->inq.first = (sc->inq.first + length) % MSBSZ;
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sc->inq.count -= length;
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/* Copy data to user process */
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error = uiomove(buffer, length, uio);
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if (error)
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break;
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}
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sc->x = sc->y = 0;
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/* Allow interrupts again */
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splx(s);
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return(error);
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}
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int mmsioctl(dev_t dev, caddr_t addr, int cmd, int flag, struct proc *p)
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{
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struct mms_softc *sc;
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struct mouseinfo info;
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int s, error;
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/* Get device information */
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sc = &mms_softc[MMSUNIT(dev)];
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/* Perform IOCTL command */
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switch (cmd) {
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case MOUSEIOCREAD:
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/* Don't modify info while calculating */
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s = spltty();
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/* Build mouse status octet */
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info.status = sc->status;
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if (sc->x || sc->y)
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info.status |= MOVEMENT;
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/* Encode X and Y motion as good as we can */
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if (sc->x > 127)
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info.xmotion = 127;
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else if (sc->x < -128)
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info.xmotion = -128;
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else
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info.xmotion = sc->x;
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if (sc->y > 127)
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info.ymotion = 127;
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else if (sc->y < -128)
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info.ymotion = -128;
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else
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info.ymotion = sc->y;
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/* Reset historical information */
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sc->x = 0;
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sc->y = 0;
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sc->status &= ~BUTCHNGMASK;
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/* Allow interrupts and copy result buffer */
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splx(s);
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error = copyout(&info, addr, sizeof(struct mouseinfo));
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break;
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default:
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error = EINVAL;
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break;
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}
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/* Return error code */
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return(error);
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}
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void mmsintr(unit)
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int unit;
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{
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struct mms_softc *sc = &mms_softc[unit];
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int ioport = mmsaddr[unit];
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char dx, dy, status;
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/* Freeze InPort registers (disabling interrupts) */
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outb(ioport+ADDR, 7);
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outb(ioport+DATA, 0x29);
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/* Read mouse status */
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outb(ioport+ADDR, 0);
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status = inb(ioport+DATA);
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/* Check if any movement detected */
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if (status & 0x40) {
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outb(ioport+ADDR, 1);
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dx = inb(ioport+DATA);
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outb(ioport+ADDR, 2);
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dy = inb(ioport+DATA);
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dy = (dy == -128) ? 127 : -dy;
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}
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else
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dx = dy = 0;
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/* Unfreeze InPort Registers (re-enables interrupts) */
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outb(ioport+ADDR, 7);
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outb(ioport+DATA, 0x09);
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/* Update accumulated movements */
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sc->x += dx;
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sc->y += dy;
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/* Inclusive OR status changes, but always save only last state */
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sc->status |= status & BUTCHNGMASK;
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sc->status = (sc->status & ~BUTSTATMASK) | (status & BUTSTATMASK);
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/* If device in use and a change occurred... */
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if (sc->state & OPEN && status & 0x78 && sc->inq.count < (MSBSZ-5)) {
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status &= BUTSTATMASK;
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sc->inq.queue[sc->inq.last++] = 0x80 | (status ^ BUTSTATMASK);
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sc->inq.queue[sc->inq.last++ % MSBSZ] = dx;
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sc->inq.queue[sc->inq.last++ % MSBSZ] = dy;
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sc->inq.queue[sc->inq.last++ % MSBSZ] = 0;
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sc->inq.queue[sc->inq.last++ % MSBSZ] = 0;
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sc->inq.last = sc->inq.last % MSBSZ;
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sc->inq.count += 5;
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if (sc->state & ASLP) {
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sc->state &= ~ASLP;
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wakeup((caddr_t)sc);
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}
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#ifdef NetBSD
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selwakeup(&sc->rsel);
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#else
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if (sc->rsel) {
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selwakeup(sc->rsel, 0);
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sc->rsel = 0;
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}
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#endif
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}
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}
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int mmsselect(dev_t dev, int rw, struct proc *p)
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{
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int s, ret;
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struct mms_softc *sc = &mms_softc[MMSUNIT(dev)];
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/* Silly to select for output */
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if (rw == FWRITE)
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return(0);
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/* Return true if a mouse event available */
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s = spltty();
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if (sc->inq.count)
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ret = 1;
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else {
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#ifdef NetBSD
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selrecord(p, &sc->rsel);
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#else
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sc->rsel = p->p_pid;
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#endif
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ret = 0;
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}
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splx(s);
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return(ret);
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}
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#endif
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