628 lines
14 KiB
C
628 lines
14 KiB
C
/* $NetBSD: ms.c,v 1.2 1996/01/30 22:35:19 gwr Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ms.c 8.1 (Berkeley) 6/11/93
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*/
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/*
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* Mouse driver (/dev/mouse)
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*/
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/*
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* Zilog Z8530 Dual UART driver (mouse interface)
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*
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* This is the "slave" driver that will be attached to
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* the "zsc" driver for a Sun mouse.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/ioctl.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <dev/ic/z8530reg.h>
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#include <machine/z8530var.h>
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#include <machine/vuid_event.h>
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#include "event_var.h"
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/*
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* How many input characters we can buffer.
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* The port-specific var.h may override this.
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* Note: must be a power of two!
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*/
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#define MS_RX_RING_SIZE 256
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#define MS_RX_RING_MASK (MS_RX_RING_SIZE-1)
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/*
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* Output buffer. Only need a few chars.
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*/
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#define MS_TX_RING_SIZE 16
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#define MS_TX_RING_MASK (MS_TX_RING_SIZE-1)
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/*
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* Keyboard serial line speed is fixed at 1200 bps.
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*/
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#define MS_BPS 1200
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/*
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* Mouse state. A Mouse Systems mouse is a fairly simple device,
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* producing five-byte blobs of the form:
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*
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* b dx dy dx dy
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*
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* where b is the button state, encoded as 0x80|(~buttons)---there are
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* three buttons (4=left, 2=middle, 1=right)---and dx,dy are X and Y
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* delta values, none of which have are in [0x80..0x87]. (This lets
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* us sync up with the mouse after an error.)
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*/
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struct ms_softc {
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struct device ms_dev; /* required first: base device */
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struct zs_chanstate *ms_cs;
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/* Flags to communicate with ms_softintr() */
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volatile int ms_intr_flags;
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#define INTR_RX_OVERRUN 1
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#define INTR_TX_EMPTY 2
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#define INTR_ST_CHECK 4
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/*
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* The receive ring buffer.
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*/
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u_int ms_rbget; /* ring buffer `get' index */
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volatile u_int ms_rbput; /* ring buffer `put' index */
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u_short ms_rbuf[MS_RX_RING_SIZE]; /* rr1, data pairs */
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/*
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* State of input translator
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*/
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short ms_byteno; /* input byte number, for decode */
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char ms_mb; /* mouse button state */
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char ms_ub; /* user button state */
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int ms_dx; /* delta-x */
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int ms_dy; /* delta-y */
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/*
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* State of upper interface.
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*/
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volatile int ms_ready; /* event queue is ready */
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struct evvar ms_events; /* event queue state */
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} ms_softc;
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cdev_decl(ms); /* open, close, read, write, ioctl, stop, ... */
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struct zsops zsops_ms;
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/****************************************************************
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* Definition of the driver for autoconfig.
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****************************************************************/
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static int ms_match(struct device *, void *, void *);
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static void ms_attach(struct device *, struct device *, void *);
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struct cfdriver mscd = {
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NULL, "ms", ms_match, ms_attach,
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DV_DULL, sizeof(struct ms_softc), NULL,
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};
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/*
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* ms_match: how is this zs channel configured?
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*/
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int
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ms_match(parent, match, aux)
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struct device *parent;
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void *match, *aux;
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{
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struct cfdata *cf = match;
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struct zsc_attach_args *args = aux;
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/* Exact match required for keyboard. */
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if (cf->cf_loc[0] == args->channel)
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return 2;
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return 0;
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}
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void
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ms_attach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct zsc_softc *zsc = (void *) parent;
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struct ms_softc *ms = (void *) self;
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struct zsc_attach_args *args = aux;
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struct zs_chanstate *cs;
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struct cfdata *cf;
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int channel, ms_unit;
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int reset, s, tconst;
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cf = ms->ms_dev.dv_cfdata;
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ms_unit = cf->cf_unit;
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channel = args->channel;
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cs = &zsc->zsc_cs[channel];
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cs->cs_private = ms;
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cs->cs_ops = &zsops_ms;
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ms->ms_cs = cs;
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printf("\n");
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/* Initialize the speed, etc. */
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tconst = BPS_TO_TCONST(cs->cs_pclk_div16, MS_BPS);
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s = splzs();
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/* May need reset... */
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reset = (channel == 0) ?
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ZSWR9_A_RESET : ZSWR9_B_RESET;
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zs_write_reg(cs, 9, reset);
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/* These are OK as set by zscc: WR3, WR4, WR5 */
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cs->cs_preg[5] |= ZSWR5_DTR | ZSWR5_RTS;
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cs->cs_preg[12] = tconst;
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cs->cs_preg[13] = tconst >> 8;
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zs_loadchannelregs(cs);
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splx(s);
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/* Initialize translator. */
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ms->ms_byteno = -1;
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}
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/****************************************************************
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* Entry points for /dev/mouse
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* (open,close,read,write,...)
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****************************************************************/
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int
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msopen(dev, flags, mode, p)
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dev_t dev;
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int flags, mode;
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struct proc *p;
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{
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struct ms_softc *ms;
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int error, s, unit;
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unit = minor(dev);
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if (unit >= mscd.cd_ndevs)
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return (ENXIO);
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ms = mscd.cd_devs[unit];
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if (ms == NULL)
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return (ENXIO);
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/* This is an exclusive open device. */
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if (ms->ms_events.ev_io)
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return (EBUSY);
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ms->ms_events.ev_io = p;
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ev_init(&ms->ms_events); /* may cause sleep */
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ms->ms_ready = 1; /* start accepting events */
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return (0);
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}
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int
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msclose(dev, flags, mode, p)
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dev_t dev;
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int flags, mode;
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struct proc *p;
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{
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struct ms_softc *ms;
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ms = mscd.cd_devs[minor(dev)];
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ms->ms_ready = 0; /* stop accepting events */
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ev_fini(&ms->ms_events);
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ms->ms_events.ev_io = NULL;
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return (0);
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}
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int
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msread(dev, uio, flags)
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dev_t dev;
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struct uio *uio;
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int flags;
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{
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struct ms_softc *ms;
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ms = mscd.cd_devs[minor(dev)];
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return (ev_read(&ms->ms_events, uio, flags));
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}
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/* this routine should not exist, but is convenient to write here for now */
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int
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mswrite(dev, uio, flags)
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dev_t dev;
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struct uio *uio;
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int flags;
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{
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return (EOPNOTSUPP);
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}
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int
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msioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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register caddr_t data;
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int flag;
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struct proc *p;
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{
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struct ms_softc *ms;
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ms = mscd.cd_devs[minor(dev)];
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switch (cmd) {
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case FIONBIO: /* we will remove this someday (soon???) */
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return (0);
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case FIOASYNC:
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ms->ms_events.ev_async = *(int *)data != 0;
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return (0);
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case TIOCSPGRP:
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if (*(int *)data != ms->ms_events.ev_io->p_pgid)
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return (EPERM);
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return (0);
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case VUIDGFORMAT:
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/* we only do firm_events */
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*(int *)data = VUID_FIRM_EVENT;
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return (0);
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case VUIDSFORMAT:
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if (*(int *)data != VUID_FIRM_EVENT)
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return (EINVAL);
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return (0);
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}
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return (ENOTTY);
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}
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int
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msselect(dev, rw, p)
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dev_t dev;
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int rw;
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struct proc *p;
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{
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struct ms_softc *ms;
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ms = mscd.cd_devs[minor(dev)];
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return (ev_select(&ms->ms_events, rw, p));
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}
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/****************************************************************
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* Middle layer (translator)
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****************************************************************/
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/*
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* Called by our ms_softint() routine on input.
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*/
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void
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ms_input(ms, c)
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register struct ms_softc *ms;
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register int c;
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{
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register struct firm_event *fe;
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register int mb, ub, d, get, put, any;
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static const char to_one[] = { 1, 2, 2, 4, 4, 4, 4 };
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static const int to_id[] = { MS_RIGHT, MS_MIDDLE, 0, MS_LEFT };
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/*
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* Discard input if not ready. Drop sync on parity or framing
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* error; gain sync on button byte.
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*/
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if (ms->ms_ready == 0)
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return;
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if (c == -1) {
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ms->ms_byteno = -1;
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return;
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}
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if ((c & ~7) == 0x80) /* if in 0x80..0x87 */
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ms->ms_byteno = 0;
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/*
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* Run the decode loop, adding to the current information.
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* We add, rather than replace, deltas, so that if the event queue
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* fills, we accumulate data for when it opens up again.
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*/
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switch (ms->ms_byteno) {
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case -1:
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return;
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case 0:
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/* buttons */
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ms->ms_byteno = 1;
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ms->ms_mb = (~c) & 0x7;
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return;
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case 1:
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/* first delta-x */
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ms->ms_byteno = 2;
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ms->ms_dx += (char)c;
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return;
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case 2:
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/* first delta-y */
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ms->ms_byteno = 3;
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ms->ms_dy += (char)c;
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return;
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case 3:
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/* second delta-x */
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ms->ms_byteno = 4;
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ms->ms_dx += (char)c;
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return;
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case 4:
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/* second delta-x */
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ms->ms_byteno = -1; /* wait for button-byte again */
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ms->ms_dy += (char)c;
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break;
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default:
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panic("ms_rint");
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/* NOTREACHED */
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}
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/*
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* We have at least one event (mouse button, delta-X, or
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* delta-Y; possibly all three, and possibly three separate
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* button events). Deliver these events until we are out
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* of changes or out of room. As events get delivered,
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* mark them `unchanged'.
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*/
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any = 0;
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get = ms->ms_events.ev_get;
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put = ms->ms_events.ev_put;
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fe = &ms->ms_events.ev_q[put];
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/* NEXT prepares to put the next event, backing off if necessary */
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#define NEXT \
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if ((++put) % EV_QSIZE == get) { \
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put--; \
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goto out; \
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}
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/* ADVANCE completes the `put' of the event */
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#define ADVANCE \
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fe++; \
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if (put >= EV_QSIZE) { \
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put = 0; \
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fe = &ms->ms_events.ev_q[0]; \
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} \
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any = 1
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mb = ms->ms_mb;
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ub = ms->ms_ub;
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while ((d = mb ^ ub) != 0) {
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/*
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* Mouse button change. Convert up to three changes
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* to the `first' change, and drop it into the event queue.
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*/
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NEXT;
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d = to_one[d - 1]; /* from 1..7 to {1,2,4} */
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fe->id = to_id[d - 1]; /* from {1,2,4} to ID */
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fe->value = mb & d ? VKEY_DOWN : VKEY_UP;
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fe->time = time;
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ADVANCE;
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ub ^= d;
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}
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if (ms->ms_dx) {
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NEXT;
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fe->id = LOC_X_DELTA;
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fe->value = ms->ms_dx;
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fe->time = time;
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ADVANCE;
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ms->ms_dx = 0;
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}
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if (ms->ms_dy) {
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NEXT;
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fe->id = LOC_Y_DELTA;
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fe->value = ms->ms_dy;
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fe->time = time;
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ADVANCE;
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ms->ms_dy = 0;
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}
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out:
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if (any) {
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ms->ms_ub = ub;
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ms->ms_events.ev_put = put;
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EV_WAKEUP(&ms->ms_events);
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}
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}
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/****************************************************************
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* Interface to the lower layer (zscc)
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****************************************************************/
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static int
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ms_rxint(cs)
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register struct zs_chanstate *cs;
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{
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register struct ms_softc *ms;
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register int put, put_next;
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register u_char c, rr1;
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ms = cs->cs_private;
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put = ms->ms_rbput;
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/* Read the input data ASAP. */
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c = zs_read_data(cs);
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/* Save the status register too. */
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rr1 = zs_read_reg(cs, 1);
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if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
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/* Clear the receive error. */
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zs_write_csr(cs, ZSWR0_RESET_ERRORS);
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}
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ms->ms_rbuf[put] = (c << 8) | rr1;
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put_next = (put + 1) & MS_RX_RING_MASK;
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/* Would overrun if increment makes (put==get). */
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if (put_next == ms->ms_rbget) {
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ms->ms_intr_flags |= INTR_RX_OVERRUN;
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} else {
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/* OK, really increment. */
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put = put_next;
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}
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/* Done reading. */
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ms->ms_rbput = put;
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/* Ask for softint() call. */
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cs->cs_softreq = 1;
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return(1);
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}
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static int
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ms_txint(cs)
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register struct zs_chanstate *cs;
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{
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register struct ms_softc *ms;
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register int count, rval;
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ms = cs->cs_private;
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zs_write_csr(cs, ZSWR0_RESET_TXINT);
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ms->ms_intr_flags |= INTR_TX_EMPTY;
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/* Ask for softint() call. */
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cs->cs_softreq = 1;
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return (1);
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}
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static int
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ms_stint(cs)
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register struct zs_chanstate *cs;
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{
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register struct ms_softc *ms;
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register int rr0;
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ms = cs->cs_private;
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rr0 = zs_read_csr(cs);
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zs_write_csr(cs, ZSWR0_RESET_STATUS);
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ms->ms_intr_flags |= INTR_ST_CHECK;
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/* Ask for softint() call. */
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cs->cs_softreq = 1;
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return (1);
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}
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static int
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ms_softint(cs)
|
|
struct zs_chanstate *cs;
|
|
{
|
|
register struct ms_softc *ms;
|
|
register int get, c, s;
|
|
int intr_flags;
|
|
register u_short ring_data;
|
|
register u_char rr0, rr1;
|
|
|
|
ms = cs->cs_private;
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|
|
|
/* Atomically get and clear flags. */
|
|
s = splzs();
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|
intr_flags = ms->ms_intr_flags;
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|
ms->ms_intr_flags = 0;
|
|
splx(s);
|
|
|
|
/*
|
|
* Copy data from the receive ring to the event layer.
|
|
*/
|
|
get = ms->ms_rbget;
|
|
while (get != ms->ms_rbput) {
|
|
ring_data = ms->ms_rbuf[get];
|
|
get = (get + 1) & MS_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",
|
|
ms->ms_dev.dv_xname, ring_data);
|
|
c = -1; /* signal input error */
|
|
}
|
|
|
|
/* Pass this up to the "middle" layer. */
|
|
ms_input(ms, c);
|
|
}
|
|
if (intr_flags & INTR_RX_OVERRUN) {
|
|
log(LOG_ERR, "%s: input overrun\n",
|
|
ms->ms_dev.dv_xname);
|
|
}
|
|
ms->ms_rbget = get;
|
|
|
|
if (intr_flags & INTR_TX_EMPTY) {
|
|
/*
|
|
* Transmit done. (Not expected.)
|
|
*/
|
|
log(LOG_ERR, "%s: transmit interrupt?\n",
|
|
ms->ms_dev.dv_xname);
|
|
}
|
|
|
|
if (intr_flags & INTR_ST_CHECK) {
|
|
/*
|
|
* Status line change. (Not expected.)
|
|
*/
|
|
log(LOG_ERR, "%s: status interrupt?\n",
|
|
ms->ms_dev.dv_xname);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
struct zsops zsops_ms = {
|
|
ms_rxint, /* receive char available */
|
|
ms_stint, /* external/status */
|
|
ms_txint, /* xmit buffer empty */
|
|
ms_softint, /* process software interrupt */
|
|
};
|