The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/lcdkp_subr.c

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    1 /* $NetBSD: lcdkp_subr.c,v 1.5 2007/10/19 11:59:54 ad Exp $ */
    2 
    3 /*
    4  * Copyright (c) 2002 Dennis I. Chernoivanov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 /*
   31  * Subroutines for simple one-port keypad.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: lcdkp_subr.c,v 1.5 2007/10/19 11:59:54 ad Exp $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/proc.h>
   40 #include <sys/conf.h>
   41 #include <sys/kernel.h>
   42 #include <sys/types.h>
   43 
   44 #include <machine/autoconf.h>
   45 #include <sys/intr.h>
   46 #include <sys/bus.h>
   47 
   48 #include <dev/ic/lcdkp_subr.h>
   49 
   50 #define HD_POLL_RATE    (hz / 10)
   51 
   52 static int    lcdkp_poll(struct lcdkp_chip *);
   53 static u_char lcdkp_scan(struct lcdkp_chip *, u_int8_t *);
   54 
   55 /*
   56  * Initialization.
   57  */
   58 void
   59 lcdkp_attach_subr(sc)
   60         struct lcdkp_chip *sc;
   61 {
   62         sc->sc_flags = 0x0;
   63         lcdkp_lock_init(sc);
   64 }
   65 
   66 /*
   67  * Scan whether input is pending, don't block if not.
   68  */
   69 int
   70 lcdkp_scankey(sc)
   71         struct lcdkp_chip *sc;
   72 {
   73         int ret;
   74 
   75         if ((sc->sc_knum == 0) || (sc->sc_kpad == NULL))
   76                 return 0;
   77 
   78         lcdkp_lock(sc);
   79         if (!(sc->sc_flags & LCDKP_HAS_BUF)) {
   80                 u_int8_t b;
   81                 if (lcdkp_scan(sc, &b) != 0) {
   82                         sc->sc_buf = b;
   83                         sc->sc_flags |= LCDKP_HAS_BUF;
   84                 }
   85         }
   86         ret = (sc->sc_flags & LCDKP_HAS_BUF);
   87         lcdkp_unlock(sc);
   88 
   89         return ret;
   90 }
   91 
   92 /*
   93  * Read new key code, block if needed.
   94  */
   95 int
   96 lcdkp_readkey(sc, result)
   97         struct lcdkp_chip *sc;
   98         u_int8_t *result;
   99 {
  100         int error;
  101 
  102         if ((sc->sc_knum == 0) || (sc->sc_kpad == NULL))
  103                 return EIO;
  104 
  105         lcdkp_lock(sc);
  106         if ( (error = lcdkp_poll(sc)) == 0) {
  107                 *result = sc->sc_buf;
  108                 sc->sc_flags &= ~LCDKP_HAS_BUF;
  109         }
  110         lcdkp_unlock(sc);
  111 
  112         return 0;
  113 }
  114 
  115 /*
  116  * Scan the keypad and translate the input.
  117  */
  118 static u_char
  119 lcdkp_scan(sc, b)
  120         struct lcdkp_chip *sc;
  121         u_int8_t *b;
  122 {
  123         u_int8_t i;
  124         u_int8_t c;
  125 
  126         c = lcdkp_dr_read(sc);
  127         for (i = 0; i < sc->sc_knum; i++) {
  128                 if (sc->sc_kpad[i].x_keycode == c) {
  129                         *b = sc->sc_kpad[i].x_outcode;
  130                         return 1;
  131                 }
  132         }
  133         return 0;
  134 }
  135 
  136 /*
  137  * Block until input is available.
  138  */
  139 static int
  140 lcdkp_poll(sc)
  141         struct lcdkp_chip *sc;
  142 {
  143         if (!(sc->sc_flags & LCDKP_HAS_BUF)) {
  144                 u_int8_t b;
  145                 while(lcdkp_scan(sc, &b) == 0) {
  146                         int err = ltsleep((void*)sc, PRIBIO | PCATCH, "kppoll",
  147                                         HD_POLL_RATE, lcdkp_lockaddr(sc));
  148                         if (err != EWOULDBLOCK) {
  149                                 if (lcdkp_scan(sc, &b) != 0)
  150                                         break;
  151                                 return EINTR;
  152                         }
  153                 }
  154                 sc->sc_buf = b;
  155                 sc->sc_flags |= LCDKP_HAS_BUF;
  156         }
  157         return 0;
  158 }

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