/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
*
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
*
* @(#)ms.c 8.1 (Berkeley) 6/11/93
*/
/*
* Mouse driver (/dev/mouse)
*/
/*
* Zilog Z8530 Dual UART driver (mouse interface)
*
* This is the "slave" driver that will be attached to
* the "zsc" driver for a Sun mouse.
*/
/****************************************************************
* Entry points for /dev/mouse
* (open,close,read,write,...)
****************************************************************/
int
msopen(dev_t dev, int flags, int mode, struct lwp *l)
{
struct ms_softc *ms;
ms = device_lookup_private(&ms_cd, minor(dev));
if (ms == NULL)
return ENXIO;
/* This is an exclusive open device. */
if (ms->ms_events.ev_io)
return EBUSY;
if (ms->ms_deviopen) {
int err;
err = (*ms->ms_deviopen)(ms->ms_dev, flags);
if (err)
return err;
}
ms->ms_events.ev_io = l->l_proc;
ev_init(&ms->ms_events); /* may cause sleep */
/*
* Called by our ms_softint() routine on input.
*/
void
ms_input(struct ms_softc *ms, int c)
{
struct firm_event *fe;
int mb, ub, d, get, put, any;
static const char to_one[] = { 1, 2, 2, 4, 4, 4, 4 };
static const int to_id[] = { MS_RIGHT, MS_MIDDLE, 0, MS_LEFT };
/*
* Discard input if not ready. Drop sync on parity or framing
* error; gain sync on button byte.
*/
if (ms->ms_ready == 0)
return;
if (c == -1) {
ms->ms_byteno = -1;
return;
}
if ((c & 0xb0) == 0x80) { /* if in 0x80..0x8f of 0xc0..0xcf */
if (c & 8) {
ms->ms_byteno = 1; /* short form (3 bytes) */
} else {
ms->ms_byteno = 0; /* long form (5 bytes) */
}
}
/*
* Run the decode loop, adding to the current information.
* We add, rather than replace, deltas, so that if the event queue
* fills, we accumulate data for when it opens up again.
*/
switch (ms->ms_byteno) {
case 2:
/* first delta-x */
ms->ms_byteno = 3;
ms->ms_dx += (char)c;
return;
case 3:
/* first delta-y */
ms->ms_byteno = 4;
ms->ms_dy += (char)c;
return;
case 4:
/* second delta-x */
ms->ms_byteno = 5;
ms->ms_dx += (char)c;
return;
case 5:
/* second delta-y */
ms->ms_byteno = -1; /* wait for button-byte again */
ms->ms_dy += (char)c;
break;
default:
panic("ms_rint");
/* NOTREACHED */
}
#if NWSMOUSE > 0
if (ms->ms_wsmousedev != NULL && ms->ms_ready == 2) {
mb = ((ms->ms_mb & 4) >> 2) |
(ms->ms_mb & 2) |
((ms->ms_mb & 1) << 2);
wsmouse_input(ms->ms_wsmousedev,
mb,
ms->ms_dx, ms->ms_dy, 0, 0,
WSMOUSE_INPUT_DELTA);
ms->ms_dx = 0;
ms->ms_dy = 0;
return;
}
#endif
/*
* We have at least one event (mouse button, delta-X, or
* delta-Y; possibly all three, and possibly three separate
* button events). Deliver these events until we are out
* of changes or out of room. As events get delivered,
* mark them `unchanged'.
*/
any = 0;
get = ms->ms_events.ev_get;
put = ms->ms_events.ev_put;
fe = &ms->ms_events.ev_q[put];
/* NEXT prepares to put the next event, backing off if necessary */
#define NEXT \
if ((++put) % EV_QSIZE == get) { \
put--; \
goto out; \
}
/* ADVANCE completes the `put' of the event */
#define ADVANCE \
fe++; \
if (put >= EV_QSIZE) { \
put = 0; \
fe = &ms->ms_events.ev_q[0]; \
} \
any = 1
mb = ms->ms_mb;
ub = ms->ms_ub;
while ((d = mb ^ ub) != 0) {
/*
* Mouse button change. Convert up to three changes
* to the `first' change, and drop it into the event queue.
*/
NEXT;
d = to_one[d - 1]; /* from 1..7 to {1,2,4} */
fe->id = to_id[d - 1]; /* from {1,2,4} to ID */
fe->value = mb & d ? VKEY_DOWN : VKEY_UP;
firm_gettime(fe);
ADVANCE;
ub ^= d;
}
if (ms->ms_dx) {
NEXT;
fe->id = LOC_X_DELTA;
fe->value = ms->ms_dx;
firm_gettime(fe);
ADVANCE;
ms->ms_dx = 0;
}
if (ms->ms_dy) {
NEXT;
fe->id = LOC_Y_DELTA;
fe->value = ms->ms_dy;
firm_gettime(fe);
ADVANCE;
ms->ms_dy = 0;
}
out:
if (any) {
ms->ms_ub = ub;
ms->ms_events.ev_put = put;
EV_WAKEUP(&ms->ms_events);
}
}
