158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
/* $NetBSD: lcdkp_subr.c,v 1.7 2011/05/14 02:58:27 rmind Exp $ */
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/*
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* Copyright (c) 2002 Dennis I. Chernoivanov
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Subroutines for simple one-port keypad.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lcdkp_subr.c,v 1.7 2011/05/14 02:58:27 rmind Exp $");
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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/conf.h>
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#include <sys/kernel.h>
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#include <sys/types.h>
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#include <machine/autoconf.h>
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#include <sys/intr.h>
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#include <sys/bus.h>
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#include <dev/ic/lcdkp_subr.h>
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#define HD_POLL_RATE (hz / 10)
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static int lcdkp_poll(struct lcdkp_chip *);
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static u_char lcdkp_scan(struct lcdkp_chip *, u_int8_t *);
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/*
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* Initialization.
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*/
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void
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lcdkp_attach_subr(struct lcdkp_chip *sc)
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{
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sc->sc_flags = 0x0;
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mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
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}
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/*
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* Scan whether input is pending, don't block if not.
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*/
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int
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lcdkp_scankey(struct lcdkp_chip *sc)
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{
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int ret;
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if ((sc->sc_knum == 0) || (sc->sc_kpad == NULL))
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return 0;
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mutex_enter(&sc->sc_lock);
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if (!(sc->sc_flags & LCDKP_HAS_BUF)) {
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u_int8_t b;
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if (lcdkp_scan(sc, &b) != 0) {
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sc->sc_buf = b;
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sc->sc_flags |= LCDKP_HAS_BUF;
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}
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}
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ret = (sc->sc_flags & LCDKP_HAS_BUF);
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mutex_exit(&sc->sc_lock);
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return ret;
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}
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/*
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* Read new key code, block if needed.
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*/
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int
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lcdkp_readkey(struct lcdkp_chip *sc, u_int8_t *result)
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{
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int error;
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if ((sc->sc_knum == 0) || (sc->sc_kpad == NULL))
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return EIO;
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mutex_enter(&sc->sc_lock);
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if ( (error = lcdkp_poll(sc)) == 0) {
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*result = sc->sc_buf;
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sc->sc_flags &= ~LCDKP_HAS_BUF;
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}
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mutex_exit(&sc->sc_lock);
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return 0;
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}
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/*
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* Scan the keypad and translate the input.
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*/
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static u_char
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lcdkp_scan(struct lcdkp_chip *sc, u_int8_t *b)
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{
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u_int8_t i;
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u_int8_t c;
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c = lcdkp_dr_read(sc);
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for (i = 0; i < sc->sc_knum; i++) {
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if (sc->sc_kpad[i].x_keycode == c) {
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*b = sc->sc_kpad[i].x_outcode;
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return 1;
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}
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}
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return 0;
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}
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/*
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* Block until input is available.
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*/
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static int
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lcdkp_poll(struct lcdkp_chip *sc)
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{
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int error;
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uint8_t b;
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KASSERT(mutex_owned(&sc->sc_lock));
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if (sc->sc_flags & LCDKP_HAS_BUF) {
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return 0;
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}
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while (lcdkp_scan(sc, &b) == 0) {
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error = mtsleep((void*)sc, PRIBIO | PCATCH, "kppoll",
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HD_POLL_RATE, &sc->sc_lock);
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if (error != EWOULDBLOCK) {
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if (lcdkp_scan(sc, &b) != 0)
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break;
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return EINTR;
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}
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}
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sc->sc_buf = b;
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sc->sc_flags |= LCDKP_HAS_BUF;
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return 0;
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}
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