NetBSD/sys/dev/wscons/wsevent.c

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/* $NetBSD: wsevent.c,v 1.3 1999/01/10 00:28:21 augustss Exp $ */
/*
* Copyright (c) 1996, 1997 Christopher G. Demetriou. 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.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
static const char _copyright[] __attribute__ ((unused)) =
"Copyright (c) 1996, 1997 Christopher G. Demetriou. All rights reserved.";
static const char _rcsid[] __attribute__ ((unused)) =
"$NetBSD: wsevent.c,v 1.3 1999/01/10 00:28:21 augustss Exp $";
/*
* 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. 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, Berkeley and its contributors.
* 4. 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.
*
* @(#)event.c 8.1 (Berkeley) 6/11/93
*/
/*
* Internal "wscons_event" queue interface for the keyboard and mouse drivers.
*/
#include <sys/param.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/select.h>
#include <sys/poll.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wseventvar.h>
/*
* Initialize a wscons_event queue.
*/
void
wsevent_init(ev)
register struct wseventvar *ev;
{
ev->get = ev->put = 0;
ev->q = malloc((u_long)WSEVENT_QSIZE * sizeof(struct wscons_event),
M_DEVBUF, M_WAITOK);
memset((caddr_t)ev->q, 0, WSEVENT_QSIZE * sizeof(struct wscons_event));
}
/*
* Tear down a wscons_event queue.
*/
void
wsevent_fini(ev)
register struct wseventvar *ev;
{
free(ev->q, M_DEVBUF);
}
/*
* User-level interface: read, poll.
* (User cannot write an event queue.)
*/
int
wsevent_read(ev, uio, flags)
register struct wseventvar *ev;
struct uio *uio;
int flags;
{
int s, n, cnt, error;
/*
* Make sure we can return at least 1.
*/
if (uio->uio_resid < sizeof(struct wscons_event))
return (EMSGSIZE); /* ??? */
s = splwsevent();
while (ev->get == ev->put) {
if (flags & IO_NDELAY) {
splx(s);
return (EWOULDBLOCK);
}
ev->wanted = 1;
error = tsleep((caddr_t)ev, PWSEVENT | PCATCH,
"wsevent_read", 0);
if (error) {
splx(s);
return (error);
}
}
/*
* Move wscons_event from tail end of queue (there is at least one
* there).
*/
if (ev->put < ev->get)
cnt = WSEVENT_QSIZE - ev->get; /* events in [get..QSIZE) */
else
cnt = ev->put - ev->get; /* events in [get..put) */
splx(s);
n = howmany(uio->uio_resid, sizeof(struct wscons_event));
if (cnt > n)
cnt = n;
error = uiomove((caddr_t)&ev->q[ev->get],
cnt * sizeof(struct wscons_event), uio);
n -= cnt;
/*
* If we do not wrap to 0, used up all our space, or had an error,
* stop. Otherwise move from front of queue to put index, if there
* is anything there to move.
*/
if ((ev->get = (ev->get + cnt) % WSEVENT_QSIZE) != 0 ||
n == 0 || error || (cnt = ev->put) == 0)
return (error);
if (cnt > n)
cnt = n;
error = uiomove((caddr_t)&ev->q[0],
cnt * sizeof(struct wscons_event), uio);
ev->get = cnt;
return (error);
}
int
wsevent_poll(ev, events, p)
register struct wseventvar *ev;
int events;
struct proc *p;
{
int revents = 0;
int s = splwsevent();
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if (events & (POLLIN | POLLRDNORM)) {
if (ev->get != ev->put)
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revents |= events & (POLLIN | POLLRDNORM);
else
selrecord(p, &ev->sel);
}
splx(s);
return (revents);
}