/*
* 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
*/
/*
* VSXXX mice attached with channel A of the 1st SCC
*/
/*
* How many input characters we can buffer.
* The port-specific var.h may override this.
* Note: must be a power of two!
*/
#define ZSMS_RX_RING_SIZE 256
#define ZSMS_RX_RING_MASK (ZSMS_RX_RING_SIZE-1)
/*
* Output buffer. Only need a few chars.
*/
#define ZSMS_TX_RING_SIZE 16
#define ZSMS_TX_RING_MASK (ZSMS_TX_RING_SIZE-1)
#define ZSMS_BPS 4800
struct zsms_softc { /* driver status information */
device_t zsms_dev; /* required first: base device */
struct zs_chanstate *zsms_cs;
/* Flags to communicate with zsms_softintr() */
volatile int zsms_intr_flags;
#define INTR_RX_OVERRUN 1
#define INTR_TX_EMPTY 2
#define INTR_ST_CHECK 4
/*
* The receive ring buffer.
*/
u_int zsms_rbget; /* ring buffer `get' index */
volatile u_int zsms_rbput; /* ring buffer `put' index */
u_short zsms_rbuf[ZSMS_RX_RING_SIZE]; /* rr1, data pairs */
int sc_enabled; /* input enabled? */
int sc_selftest; /* self test in progress */
/* Initialize the speed, etc. */
s = splzs();
/* May need reset... */
zs_write_reg(cs, 9, ZSWR9_A_RESET);
/* These are OK as set by zscc: WR3, WR5 */
/* We don't care about status or tx interrupts. */
cs->cs_preg[1] = ZSWR1_RIE;
(void) zs_set_speed(cs, ZSMS_BPS);
if (sc->inputstate == 1) {
/* LMR -> RML: wsevents counts 0 for the left-most */
sc->buttons = data & 02;
if (data & 01)
sc->buttons |= 04;
if (data & 04)
sc->buttons |= 01;
sc->dx = data & MOUSE_X_SIGN;
sc->dy = data & MOUSE_Y_SIGN;
} else if (sc->inputstate == 2) {
if (sc->dx == 0)
sc->dx = -data;
else
sc->dx = data;
} else if (sc->inputstate == 3) {
sc->inputstate = 0;
if (sc->dy == 0)
sc->dy = -data;
else
sc->dy = data;
wsmouse_input(sc->sc_wsmousedev,
sc->buttons,
sc->dx, sc->dy, 0, 0,
WSMOUSE_INPUT_DELTA);
}
return;
}
/****************************************************************
* Interface to the lower layer (zscc)
****************************************************************/
/*
* First read the status, because reading the received char
* destroys the status of this char.
*/
rr1 = zs_read_reg(cs, 1);
c = zs_read_data(cs);
if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
/* Clear the receive error. */
zs_write_csr(cs, ZSWR0_RESET_ERRORS);
}
/*
* We have to accumulate status line changes here.
* Otherwise, if we get multiple status interrupts
* before the softint runs, we could fail to notice
* some status line changes in the softint routine.
* Fix from Bill Studenmund, October 1996.
*/
cs->cs_rr0_delta |= (cs->cs_rr0 ^ rr0);
cs->cs_rr0 = rr0;
zsms->zsms_intr_flags |= INTR_ST_CHECK;
/* Ask for softint() call. */
cs->cs_softreq = 1;
}
static void
zsms_softint(struct zs_chanstate *cs)
{
struct zsms_softc *zsms;
int get, c, s;
int intr_flags;
u_short ring_data;
zsms = cs->cs_private;
/* Atomically get and clear flags. */
s = splzs();
intr_flags = zsms->zsms_intr_flags;
zsms->zsms_intr_flags = 0;
/* Now lower to spltty for the rest. */
(void) spltty();
/*
* Copy data from the receive ring to the event layer.
*/
get = zsms->zsms_rbget;
while (get != zsms->zsms_rbput) {
ring_data = zsms->zsms_rbuf[get];
get = (get + 1) & ZSMS_RX_RING_MASK;
/* low byte of ring_data is rr1 */
c = (ring_data >> 8) & 0xff;
if (ring_data & ZSRR1_DO)
intr_flags |= INTR_RX_OVERRUN;
if (ring_data & (ZSRR1_FE | ZSRR1_PE)) {
log(LOG_ERR, "%s: input error (0x%x)\n",
device_xname(zsms->zsms_dev), ring_data);
c = -1; /* signal input error */
}
/* Pass this up to the "middle" layer. */
zsms_input(zsms, c);
}
if (intr_flags & INTR_RX_OVERRUN) {
log(LOG_ERR, "%s: input overrun\n",
device_xname(zsms->zsms_dev));
}
zsms->zsms_rbget = get;
