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

456 lines
10 KiB
C

/*-
* Copyright (c) 1994 Charles Hannum.
* 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: pms.c,v 1.13 1994/07/19 05:08:55 mycroft Exp $
*/
/*
* XXXX
* This is a hack. This driver should really be combined with the
* keyboard driver, since they go through the same buffer and use the
* same I/O ports. Frobbing the mouse and keyboard at the same time
* may result in dropped characters and/or corrupted mouse events.
*/
#include "pms.h"
#if NPMS > 1
#error Only one PS/2 style mouse may be configured into your system.
#endif
#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>
#include <sys/device.h>
#include <machine/cpu.h>
#include <machine/pio.h>
#include <machine/mouse.h>
#include <i386/isa/isavar.h>
#define PMS_DATA 0 /* offset for data port, read-write */
#define PMS_CNTRL 4 /* offset for control port, write-only */
#define PMS_STATUS 4 /* offset for status port, read-only */
#define PMS_NPORTS 8
/* status bits */
#define PMS_OBUF_FULL 0x01
#define PMS_IBUF_FULL 0x02
/* controller commands */
#define PMS_INT_ENABLE 0x47 /* enable controller interrupts */
#define PMS_INT_DISABLE 0x65 /* disable controller interrupts */
#define PMS_AUX_ENABLE 0xa7 /* enable auxiliary port */
#define PMS_AUX_DISABLE 0xa8 /* disable auxiliary port */
#define PMS_MAGIC_1 0xa9 /* XXX */
#define PMS_MAGIC_2 0xaa /* XXX */
#define PMS_8042_CMD 0x65
/* mouse commands */
#define PMS_SET_SCALE11 0xe6 /* set scaling 1:1 */
#define PMS_SET_SCALE21 0xe7 /* set scaling 2:1 */
#define PMS_SET_RES 0xe8 /* set resolution */
#define PMS_GET_SCALE 0xe9 /* get scaling factor */
#define PMS_SET_STREAM 0xea /* set streaming mode */
#define PMS_SET_SAMPLE 0xf3 /* set sampling rate */
#define PMS_DEV_ENABLE 0xf4 /* mouse on */
#define PMS_DEV_DISABLE 0xf5 /* mouse off */
#define PMS_RESET 0xff /* reset */
#define PMS_CHUNK 128 /* chunk size for read */
#define PMS_BSIZE 1020 /* buffer size */
struct pms_softc { /* driver status information */
struct device sc_dev;
struct intrhand sc_ih;
struct clist sc_q;
struct selinfo sc_rsel;
u_short sc_iobase; /* I/O port base */
u_char sc_state; /* mouse driver state */
#define PMS_OPEN 0x01 /* device is open */
#define PMS_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 */
};
int pmsprobe();
void pmsattach();
int pmsintr __P((struct pms_softc *));
struct cfdriver pmscd = {\
NULL, "pms", pmsprobe, pmsattach, DV_TTY, sizeof(struct pms_softc)
};
#define PMSUNIT(dev) (minor(dev))
static inline void
pms_flush(iobase)
u_short iobase;
{
u_char c;
while (c = inb(iobase+PMS_STATUS) & 0x03)
if ((c & PMS_OBUF_FULL) == PMS_OBUF_FULL) {
/* XXX - delay is needed to prevent some keyboards from
wedging when the system boots */
delay(6);
(void) inb(iobase+PMS_DATA);
}
}
static inline void
pms_dev_cmd(iobase, value)
u_short iobase;
u_char value;
{
pms_flush(iobase);
outb(iobase+PMS_CNTRL, 0xd4);
pms_flush(iobase);
outb(iobase+PMS_DATA, value);
}
static inline void
pms_aux_cmd(iobase, value)
u_short iobase;
u_char value;
{
pms_flush(iobase);
outb(iobase+PMS_CNTRL, value);
}
static inline void
pms_pit_cmd(iobase, value)
u_short iobase;
u_char value;
{
pms_flush(iobase);
outb(iobase+PMS_CNTRL, 0x60);
pms_flush(iobase);
outb(iobase+PMS_DATA, value);
}
int
pmsprobe(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct isa_attach_args *ia = aux;
u_short iobase = ia->ia_iobase;
u_char x;
pms_dev_cmd(iobase, PMS_RESET);
pms_aux_cmd(iobase, PMS_MAGIC_1);
pms_aux_cmd(iobase, PMS_MAGIC_2);
x = inb(iobase+PMS_DATA);
pms_pit_cmd(iobase, PMS_INT_DISABLE);
if (x & 0x04)
return 0;
ia->ia_iosize = PMS_NPORTS;
ia->ia_msize = 0;
return 1;
}
void
pmsattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct pms_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
u_short iobase = ia->ia_iobase;
printf("\n");
/* Other initialization was done by pmsprobe. */
sc->sc_iobase = iobase;
sc->sc_state = 0;
sc->sc_ih.ih_fun = pmsintr;
sc->sc_ih.ih_arg = sc;
sc->sc_ih.ih_level = IPL_NONE;
intr_establish(ia->ia_irq, &sc->sc_ih);
}
int
pmsopen(dev, flag)
dev_t dev;
int flag;
{
int unit = PMSUNIT(dev);
struct pms_softc *sc;
if (unit >= pmscd.cd_ndevs)
return ENXIO;
sc = pmscd.cd_devs[unit];
if (!sc)
return ENXIO;
if (sc->sc_state & PMS_OPEN)
return EBUSY;
if (clalloc(&sc->sc_q, PMS_BSIZE, 0) == -1)
return ENOMEM;
sc->sc_state |= PMS_OPEN;
sc->sc_status = 0;
sc->sc_x = sc->sc_y = 0;
/* Enable interrupts. */
pms_dev_cmd(sc->sc_iobase, PMS_DEV_ENABLE);
pms_aux_cmd(sc->sc_iobase, PMS_AUX_ENABLE);
#if 0
pms_dev_cmd(sc->sc_iobase, PMS_SET_RES);
pms_dev_cmd(sc->sc_iobase, 3); /* 8 counts/mm */
pms_dev_cmd(sc->sc_iobase, PMS_SET_SCALE21);
pms_dev_cmd(sc->sc_iobase, PMS_SET_SAMPLE);
pms_dev_cmd(sc->sc_iobase, 100); /* 100 samples/sec */
pms_dev_cmd(sc->sc_iobase, PMS_SET_STREAM);
#endif
pms_pit_cmd(sc->sc_iobase, PMS_INT_ENABLE);
return 0;
}
int
pmsclose(dev, flag)
dev_t dev;
int flag;
{
struct pms_softc *sc = pmscd.cd_devs[PMSUNIT(dev)];
/* Disable interrupts. */
pms_dev_cmd(sc->sc_iobase, PMS_DEV_DISABLE);
pms_pit_cmd(sc->sc_iobase, PMS_INT_DISABLE);
pms_aux_cmd(sc->sc_iobase, PMS_AUX_DISABLE);
sc->sc_state &= ~PMS_OPEN;
clfree(&sc->sc_q);
return 0;
}
int
pmsread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
struct pms_softc *sc = pmscd.cd_devs[PMSUNIT(dev)];
int s;
int error;
size_t length;
u_char buffer[PMS_CHUNK];
/* Block until mouse activity occured. */
s = spltty();
while (sc->sc_q.c_cc == 0) {
if (flag & IO_NDELAY) {
splx(s);
return EWOULDBLOCK;
}
sc->sc_state |= PMS_ASLP;
if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "pmsrea", 0)) {
sc->sc_state &= ~PMS_ASLP;
splx(s);
return error;
}
}
splx(s);
/* Transfer as many chunks as possible. */
while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
length = min(sc->sc_q.c_cc, uio->uio_resid);
if (length > sizeof(buffer))
length = sizeof(buffer);
/* Remove a small chunk from the input queue. */
(void) q_to_b(&sc->sc_q, buffer, length);
/* Copy the data to the user process. */
if (error = uiomove(buffer, length, uio))
break;
}
return error;
}
int
pmsioctl(dev, cmd, addr, flag)
dev_t dev;
int cmd;
caddr_t addr;
int flag;
{
struct pms_softc *sc = pmscd.cd_devs[PMSUNIT(dev)];
struct mouseinfo info;
int s;
int error;
switch (cmd) {
case MOUSEIOCREAD:
s = spltty();
info.status = sc->sc_status;
if (sc->sc_x || sc->sc_y)
info.status |= MOVEMENT;
if (sc->sc_x > 127)
info.xmotion = 127;
else if (sc->sc_x < -127)
/* Bounding at -127 avoids a bug in XFree86. */
info.xmotion = -127;
else
info.xmotion = sc->sc_x;
if (sc->sc_y > 127)
info.ymotion = 127;
else if (sc->sc_y < -127)
info.ymotion = -127;
else
info.ymotion = sc->sc_y;
/* Reset historical information. */
sc->sc_x = sc->sc_y = 0;
sc->sc_status &= ~BUTCHNGMASK;
ndflush(&sc->sc_q, sc->sc_q.c_cc);
splx(s);
error = copyout(&info, addr, sizeof(struct mouseinfo));
break;
default:
error = EINVAL;
break;
}
return error;
}
/* Masks for the first byte of a packet */
#define PS2LBUTMASK 0x01
#define PS2RBUTMASK 0x02
#define PS2MBUTMASK 0x04
int
pmsintr(sc)
struct pms_softc *sc;
{
u_short iobase = sc->sc_iobase;
static int state = 0;
static u_char buttons;
u_char changed;
static char dx, dy;
u_char buffer[5];
if ((sc->sc_state & PMS_OPEN) == 0) {
/* Interrupts are not expected. Discard the byte. */
(void) inb(iobase + PMS_DATA);
return 0;
}
switch (state) {
case 0:
buttons = inb(iobase + PMS_DATA);
if ((buttons & 0xc0) == 0)
++state;
break;
case 1:
dx = inb(iobase + PMS_DATA);
/* Bounding at -127 avoids a bug in XFree86. */
dx = (dx == -128) ? -127 : dx;
++state;
break;
case 2:
dy = inb(iobase + PMS_DATA);
dy = (dy == -128) ? -127 : dy;
state = 0;
buttons = ((buttons & PS2LBUTMASK) << 2) |
((buttons & (PS2RBUTMASK | PS2MBUTMASK)) >> 1);
changed = ((buttons ^ sc->sc_status) & BUTSTATMASK) << 3;
sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
if (dx || dy || changed) {
/* Update accumulated movements. */
sc->sc_x += dx;
sc->sc_y += dy;
/* 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);
if (sc->sc_state & PMS_ASLP) {
sc->sc_state &= ~PMS_ASLP;
wakeup((caddr_t)sc);
}
selwakeup(&sc->sc_rsel);
}
break;
}
return -1;
}
int
pmsselect(dev, rw, p)
dev_t dev;
int rw;
struct proc *p;
{
struct pms_softc *sc = pmscd.cd_devs[PMSUNIT(dev)];
int s;
int ret;
if (rw == FWRITE)
return 0;
s = spltty();
if (!sc->sc_q.c_cc) {
selrecord(p, &sc->sc_rsel);
ret = 0;
} else
ret = 1;
splx(s);
return ret;
}