118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/*-
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* Copyright (c) 1992-1995 Søren Schmidt
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz and Don Ahn.
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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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* in this position and unchanged.
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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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* This is a modified version of the keyboard reset code used in syscons.
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* If the keyboard reset fails, we assume that the keyboard has been
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* unplugged and we use a serial port (COM1) as the console instead.
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* Returns 1 on failure (no keyboard), 0 on success (keyboard attached).
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*
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* This grody hack brought to you by Bill Paul (wpaul@ctr.columbia.edu)
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*
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* $Id: probe_keyboard.c,v 1.6 1996/03/08 06:29:07 bde Exp $
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*/
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#ifdef PROBE_KEYBOARD
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#include <machine/console.h>
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#include <machine/cpufunc.h>
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#include "boot.h"
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int
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probe_keyboard(void)
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{
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int i, retries = 5;
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unsigned char val;
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/* flush any noise in the buffer */
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while (inb(KB_STAT) & KB_BUF_FULL) {
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delay1ms();
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(void) inb(KB_DATA);
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}
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/* Try to reset keyboard hardware */
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again:
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while (--retries) {
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#ifdef DEBUG
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printf("%d ", retries);
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#endif
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while ((inb(KB_STAT) & KB_READY) == KB_READY) delay1ms();
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outb(KB_DATA, KB_RESET);
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for (i=0; i<1000; i++) {
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delay1ms();
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val = inb(KB_DATA);
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if (val == KB_ACK || val == KB_ECHO)
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goto gotack;
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if (val == KB_RESEND)
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break;
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}
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}
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gotres:
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#ifdef DEBUG
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printf("gotres\n");
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#endif
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if (!retries) {
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#ifdef DEBUG
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printf("gave up\n");
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#endif
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return(1);
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}
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gotack:
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delay1ms();
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while ((inb(KB_STAT) & KB_BUF_FULL) == 0) delay1ms();
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delay1ms();
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#ifdef DEBUG
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printf("ACK ");
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#endif
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val = inb(KB_DATA);
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if (val == KB_ACK)
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goto gotack;
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if (val == KB_RESEND)
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goto again;
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if (val != KB_RESET_DONE) {
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#ifdef DEBUG
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printf("stray val %d\n", val);
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#endif
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return(0);
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}
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#ifdef DEBUG
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printf("ok\n");
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#endif
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return(0);
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}
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#endif /* PROBE_KEYBOARD */
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