NetBSD/sys/arch/alpha/isa/pckbd.c

/*	$NetBSD: pckbd.c,v 1.1 1995/08/03 00:48:25 cgd Exp $	*/

/*-
 * Copyright (c) 1993, 1994, 1995 Charles Hannum.  All rights reserved.
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz and Don Ahn.
 *
 * 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.
 *
 *	@(#)pccons.c	5.11 (Berkeley) 5/21/91
 */

/*
 * code to work keyboard & display for PC-style console
 */

#include <sys/param.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>

#include <machine/cpu.h>
#include <machine/pio.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <alpha/isa/pckbdreg.h>

static volatile u_char ack, nak;	/* Don't ask. */
static u_char async, kernel, polling;	/* Really, you don't want to know. */
static u_char lock_state = 0x00,	/* all off */
	      old_lock_state = 0xff,
	      typematic_rate = 0xff,	/* don't update until set by user */
	      old_typematic_rate = 0xff;

struct pckbd_softc {
        struct  device sc_dev;
        void    *sc_ih;
};

int pckbdprobe __P((struct device *, void *, void *));
void pckbdattach __P((struct device *, struct device *, void *));
int pckbdintr __P((void *));

struct cfdriver pckbdcd = {
	NULL, "pckbd", pckbdprobe, pckbdattach, DV_DULL,
	    sizeof(struct pckbd_softc)
};

char *sget __P((void));
int pccngetc __P((void *));
void pccnpollc __P((void *, int));

/*
 * DANGER WIL ROBINSON -- the values of SCROLL, NUM, CAPS, and ALT are
 * important.
 */
#define	SCROLL		0x0001	/* stop output */
#define	NUM		0x0002	/* numeric shift  cursors vs. numeric */
#define	CAPS		0x0004	/* caps shift -- swaps case of letter */
#define	SHIFT		0x0008	/* keyboard shift */
#define	CTL		0x0010	/* control shift  -- allows ctl function */
#define	ASCII		0x0020	/* ascii code for this key */
#define	ALT		0x0080	/* alternate shift -- alternate chars */
#define	FUNC		0x0100	/* function key */
#define	KP		0x0200	/* Keypad keys */
#define	NONE		0x0400	/* no function */

#define	KBD_DELAY \
	{ u_char x = inb(0x84); } \
	{ u_char x = inb(0x84); } \
	{ u_char x = inb(0x84); } \
	{ u_char x = inb(0x84); }

static inline int
kbd_wait_output()
{
	u_int i;

	for (i = 100000; i; i--)
		if ((inb(KBSTATP) & KBS_IBF) == 0) {
			KBD_DELAY;
			return 1;
		}
	return 0;
}

static inline int
kbd_wait_input()
{
	u_int i;

	for (i = 100000; i; i--)
		if ((inb(KBSTATP) & KBS_DIB) != 0) {
			KBD_DELAY;
			return 1;
		}
	return 0;
}

static inline void
kbd_flush_input()
{
	u_int i;

	for (i = 10; i; i--) {
		if ((inb(KBSTATP) & KBS_DIB) == 0)
			return;
		KBD_DELAY;
		(void) inb(KBDATAP);
	}
}

#if 1
/*
 * Get the current command byte.
 */
static u_char
kbc_get8042cmd()
{

	if (!kbd_wait_output())
		return -1;
	outb(KBCMDP, K_RDCMDBYTE);
	if (!kbd_wait_input())
		return -1;
	return inb(KBDATAP);
}
#endif

/*
 * Pass command byte to keyboard controller (8042).
 */
static int
kbc_put8042cmd(val)
	u_char val;
{

	if (!kbd_wait_output())
		return 0;
	outb(KBCMDP, K_LDCMDBYTE);
	if (!kbd_wait_output())
		return 0;
	outb(KBOUTP, val);
	return 1;
}

/*
 * Pass command to keyboard itself
 */
int
kbd_cmd(val, polling)
	u_char val;
	u_char polling;
{
	u_int retries = 3;
	register u_int i;

	do {
		if (!kbd_wait_output())
			return 0;
		ack = nak = 0;
		outb(KBOUTP, val);
		if (polling)
			for (i = 100000; i; i--) {
				if (inb(KBSTATP) & KBS_DIB) {
					register u_char c;

					KBD_DELAY;
					c = inb(KBDATAP);
					if (c == KBR_ACK || c == KBR_ECHO) {
						ack = 1;
						return 1;
					}
					if (c == KBR_RESEND) {
						nak = 1;
						break;
					}
#ifdef DIAGNOSTIC
					printf("kbd_cmd: input char %x lost\n", c);
#endif
				}
			}
		else
			for (i = 100000; i; i--) {
				(void) inb(KBSTATP);
				if (ack)
					return 1;
				if (nak)
					break;
			}
		if (!nak)
			return 0;
	} while (--retries);
	return 0;
}

/*
 * these are both bad jokes
 */
int
pckbdprobe(parent, match, aux)
	struct device *parent;
	void *match, *aux;
{
	struct isa_attach_args *ia = aux;
	u_int i;

	/* Enable interrupts and keyboard, etc. */
	if (!kbc_put8042cmd(CMDBYTE)) {
		printf("pcprobe: command error\n");
		return 0;
	}

#if 1
	/* Flush any garbage. */
	kbd_flush_input();
	/* Reset the keyboard. */
	if (!kbd_cmd(KBC_RESET, 1)) {
		printf("pcprobe: reset error %d\n", 1);
		goto lose;
	}
	for (i = 600000; i; i--)
		if ((inb(KBSTATP) & KBS_DIB) != 0) {
			KBD_DELAY;
			break;
		}
	if (i == 0 || inb(KBDATAP) != KBR_RSTDONE) {
		printf("pcprobe: reset error %d\n", 2);
		goto lose;
	}
	/*
	 * Some keyboards seem to leave a second ack byte after the reset.
	 * This is kind of stupid, but we account for them anyway by just
	 * flushing the buffer.
	 */
	kbd_flush_input();
	/* Just to be sure. */
	if (!kbd_cmd(KBC_ENABLE, 1)) {
		printf("pcprobe: reset error %d\n", 3);
		goto lose;
	}

	/*
	 * Some keyboard/8042 combinations do not seem to work if the keyboard
	 * is set to table 1; in fact, it would appear that some keyboards just
	 * ignore the command altogether.  So by default, we use the AT scan
	 * codes and have the 8042 translate them.  Unfortunately, this is
	 * known to not work on some PS/2 machines.  We try desparately to deal
	 * with this by checking the (lack of a) translate bit in the 8042 and
	 * attempting to set the keyboard to XT mode.  If this all fails, well,
	 * tough luck.
	 *
	 * XXX It would perhaps be a better choice to just use AT scan codes
	 * and not bother with this.
	 */
	if (kbc_get8042cmd() & KC8_TRANS) {
		/* The 8042 is translating for us; use AT codes. */
		if (!kbd_cmd(KBC_SETTABLE, 1) || !kbd_cmd(2, 1)) {
			printf("pcprobe: reset error %d\n", 4);
			goto lose;
		}
	} else {
		/* Stupid 8042; set keyboard to XT codes. */
		if (!kbd_cmd(KBC_SETTABLE, 1) || !kbd_cmd(1, 1)) {
			printf("pcprobe: reset error %d\n", 5);
			goto lose;
		}
	}

lose:
	/*
	 * Technically, we should probably fail the probe.  But we'll be nice
	 * and allow keyboard-less machines to boot with the console.
	 */
#endif

	ia->ia_iosize = 16;
	ia->ia_msize = 0;
	return 1;
}

void
pckbdattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct pckbd_softc *sc = (void *)self;
	struct isa_attach_args *ia = aux;

	printf("\n");
	sc->sc_ih = isa_intr_establish(ia->ia_irq, ISA_IST_EDGE, ISA_IPL_TTY,
	    pckbdintr, sc);
	wscattach_input(self, self, pccngetc, pccnpollc);
}

/*
 * Got a console receive interrupt -
 * the console processor wants to give us a character.
 * Catch the character, and see who it goes to.
 */
int
pckbdintr(arg)
	void *arg;
{
	struct pckbd_softc *sc = arg;
	u_char *cp;

	if ((inb(KBSTATP) & KBS_DIB) == 0)
		return 0;
	if (polling)
		return 1;
	do {
		cp = sget();
		if (cp)
			wscons_kbdinput(cp);
	} while (inb(KBSTATP) & KBS_DIB);
	return 1;
}

void
do_async_update(poll)
	u_char poll;
{
	int pos;
	static int old_pos = -1;

	async = 0;

	if (lock_state != old_lock_state) {
		old_lock_state = lock_state;
		if (!kbd_cmd(KBC_MODEIND, poll) ||
		    !kbd_cmd(lock_state, poll)) {
			printf("pc: timeout updating leds\n");
			(void) kbd_cmd(KBC_ENABLE, poll);
		}
	}
	if (typematic_rate != old_typematic_rate) {
		old_typematic_rate = typematic_rate;
		if (!kbd_cmd(KBC_TYPEMATIC, poll) ||
		    !kbd_cmd(typematic_rate, poll)) {
			printf("pc: timeout updating typematic rate\n");
			(void) kbd_cmd(KBC_ENABLE, poll);
		}
	}
}

void
async_update()
{

	if (kernel || polling) {
		if (async)
			untimeout(do_async_update, NULL);
		do_async_update(1);
	} else {
		if (async)
			return;
		async = 1;
		timeout(do_async_update, NULL, 1);
	}
}

#if 0
int
pcioctl(dev, cmd, data, flag, p)
	dev_t dev;
	u_long cmd;
	caddr_t data;
	int flag;
	struct proc *p;
{
	struct pc_softc *sc = pccd.cd_devs[PCUNIT(dev)];
	int error;

	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
	if (error >= 0)
		return error;
	error = ttioctl(tp, cmd, data, flag, p);
	if (error >= 0)
		return error;

	switch (cmd) {
	case CONSOLE_X_MODE_ON:
		pc_xmode_on();
		return 0;
	case CONSOLE_X_MODE_OFF:
		pc_xmode_off();
		return 0;
	case CONSOLE_X_BELL:
		/*
		 * If set, data is a pointer to a length 2 array of
		 * integers.  data[0] is the pitch in Hz and data[1]
		 * is the duration in msec.
		 */
		if (data)
			sysbeep(((int*)data)[0],
				(((int*)data)[1] * hz) / 1000);
		else
			sysbeep(BEEP_FREQ, BEEP_TIME);
		return 0;
	case CONSOLE_SET_TYPEMATIC_RATE: {
 		u_char	rate;

 		if (!data)
			return EINVAL;
		rate = *((u_char *)data);
		/*
		 * Check that it isn't too big (which would cause it to be
		 * confused with a command).
		 */
		if (rate & 0x80)
			return EINVAL;
		typematic_rate = rate;
		async_update();
		return 0;
 	}
	default:
		return ENOTTY;
	}

#ifdef DIAGNOSTIC
	panic("pcioctl: impossible");
#endif
}
#endif

#define	CODE_SIZE	4		/* Use a max of 4 for now... */
typedef struct {
	u_short	type;
	char unshift[CODE_SIZE];
	char shift[CODE_SIZE];
	char ctl[CODE_SIZE];
} Scan_def;

static Scan_def	scan_codes[] = {
	NONE,	"",		"",		"",		/* 0 unused */
	ASCII,	"\033",		"\033",		"\033",		/* 1 ESCape */
	ASCII,	"1",		"!",		"!",		/* 2 1 */
	ASCII,	"2",		"@",		"\000",		/* 3 2 */
	ASCII,	"3",		"#",		"#",		/* 4 3 */
	ASCII,	"4",		"$",		"$",		/* 5 4 */
	ASCII,	"5",		"%",		"%",		/* 6 5 */
	ASCII,	"6",		"^",		"\036",		/* 7 6 */
	ASCII,	"7",		"&",		"&",		/* 8 7 */
	ASCII,	"8",		"*",		"\010",		/* 9 8 */
	ASCII,	"9",		"(",		"(",		/* 10 9 */
	ASCII,	"0",		")",		")",		/* 11 0 */
	ASCII,	"-",		"_",		"\037",		/* 12 - */
	ASCII,	"=",		"+",		"+",		/* 13 = */
	ASCII,	"\177",		"\177",		"\010",		/* 14 backspace */
	ASCII,	"\t",		"\177\t",	"\t",		/* 15 tab */
	ASCII,	"q",		"Q",		"\021",		/* 16 q */
	ASCII,	"w",		"W",		"\027",		/* 17 w */
	ASCII,	"e",		"E",		"\005",		/* 18 e */
	ASCII,	"r",		"R",		"\022",		/* 19 r */
	ASCII,	"t",		"T",		"\024",		/* 20 t */
	ASCII,	"y",		"Y",		"\031",		/* 21 y */
	ASCII,	"u",		"U",		"\025",		/* 22 u */
	ASCII,	"i",		"I",		"\011",		/* 23 i */
	ASCII,	"o",		"O",		"\017",		/* 24 o */
	ASCII,	"p",		"P",		"\020",		/* 25 p */
	ASCII,	"[",		"{",		"\033",		/* 26 [ */
	ASCII,	"]",		"}",		"\035",		/* 27 ] */
	ASCII,	"\r",		"\r",		"\n",		/* 28 return */
	CTL,	"",		"",		"",		/* 29 control */
	ASCII,	"a",		"A",		"\001",		/* 30 a */
	ASCII,	"s",		"S",		"\023",		/* 31 s */
	ASCII,	"d",		"D",		"\004",		/* 32 d */
	ASCII,	"f",		"F",		"\006",		/* 33 f */
	ASCII,	"g",		"G",		"\007",		/* 34 g */
	ASCII,	"h",		"H",		"\010",		/* 35 h */
	ASCII,	"j",		"J",		"\n",		/* 36 j */
	ASCII,	"k",		"K",		"\013",		/* 37 k */
	ASCII,	"l",		"L",		"\014",		/* 38 l */
	ASCII,	";",		":",		";",		/* 39 ; */
	ASCII,	"'",		"\"",		"'",		/* 40 ' */
	ASCII,	"`",		"~",		"`",		/* 41 ` */
	SHIFT,	"",		"",		"",		/* 42 shift */
	ASCII,	"\\",		"|",		"\034",		/* 43 \ */
	ASCII,	"z",		"Z",		"\032",		/* 44 z */
	ASCII,	"x",		"X",		"\030",		/* 45 x */
	ASCII,	"c",		"C",		"\003",		/* 46 c */
	ASCII,	"v",		"V",		"\026",		/* 47 v */
	ASCII,	"b",		"B",		"\002",		/* 48 b */
	ASCII,	"n",		"N",		"\016",		/* 49 n */
	ASCII,	"m",		"M",		"\r",		/* 50 m */
	ASCII,	",",		"<",		"<",		/* 51 , */
	ASCII,	".",		">",		">",		/* 52 . */
	ASCII,	"/",		"?",		"\037",		/* 53 / */
	SHIFT,	"",		"",		"",		/* 54 shift */
	KP,	"*",		"*",		"*",		/* 55 kp * */
	ALT,	"",		"",		"",		/* 56 alt */
	ASCII,	" ",		" ",		"\000",		/* 57 space */
	CAPS,	"",		"",		"",		/* 58 caps */
	FUNC,	"\033[M",	"\033[Y",	"\033[k",	/* 59 f1 */
	FUNC,	"\033[N",	"\033[Z",	"\033[l",	/* 60 f2 */
	FUNC,	"\033[O",	"\033[a",	"\033[m",	/* 61 f3 */
	FUNC,	"\033[P",	"\033[b",	"\033[n",	/* 62 f4 */
	FUNC,	"\033[Q",	"\033[c",	"\033[o",	/* 63 f5 */
	FUNC,	"\033[R",	"\033[d",	"\033[p",	/* 64 f6 */
	FUNC,	"\033[S",	"\033[e",	"\033[q",	/* 65 f7 */
	FUNC,	"\033[T",	"\033[f",	"\033[r",	/* 66 f8 */
	FUNC,	"\033[U",	"\033[g",	"\033[s",	/* 67 f9 */
	FUNC,	"\033[V",	"\033[h",	"\033[t",	/* 68 f10 */
	NUM,	"",		"",		"",		/* 69 num lock */
	SCROLL,	"",		"",		"",		/* 70 scroll lock */
	KP,	"7",		"\033[H",	"7",		/* 71 kp 7 */
	KP,	"8",		"\033[A",	"8",		/* 72 kp 8 */
	KP,	"9",		"\033[I",	"9",		/* 73 kp 9 */
	KP,	"-",		"-",		"-",		/* 74 kp - */
	KP,	"4",		"\033[D",	"4",		/* 75 kp 4 */
	KP,	"5",		"\033[E",	"5",		/* 76 kp 5 */
	KP,	"6",		"\033[C",	"6",		/* 77 kp 6 */
	KP,	"+",		"+",		"+",		/* 78 kp + */
	KP,	"1",		"\033[F",	"1",		/* 79 kp 1 */
	KP,	"2",		"\033[B",	"2",		/* 80 kp 2 */
	KP,	"3",		"\033[G",	"3",		/* 81 kp 3 */
	KP,	"0",		"\033[L",	"0",		/* 82 kp 0 */
	KP,	".",		"\177",		".",		/* 83 kp . */
	NONE,	"",		"",		"",		/* 84 0 */
	NONE,	"100",		"",		"",		/* 85 0 */
	NONE,	"101",		"",		"",		/* 86 0 */
	FUNC,	"\033[W",	"\033[i",	"\033[u",	/* 87 f11 */
	FUNC,	"\033[X",	"\033[j",	"\033[v",	/* 88 f12 */
	NONE,	"102",		"",		"",		/* 89 0 */
	NONE,	"103",		"",		"",		/* 90 0 */
	NONE,	"",		"",		"",		/* 91 0 */
	NONE,	"",		"",		"",		/* 92 0 */
	NONE,	"",		"",		"",		/* 93 0 */
	NONE,	"",		"",		"",		/* 94 0 */
	NONE,	"",		"",		"",		/* 95 0 */
	NONE,	"",		"",		"",		/* 96 0 */
	NONE,	"",		"",		"",		/* 97 0 */
	NONE,	"",		"",		"",		/* 98 0 */
	NONE,	"",		"",		"",		/* 99 0 */
	NONE,	"",		"",		"",		/* 100 */
	NONE,	"",		"",		"",		/* 101 */
	NONE,	"",		"",		"",		/* 102 */
	NONE,	"",		"",		"",		/* 103 */
	NONE,	"",		"",		"",		/* 104 */
	NONE,	"",		"",		"",		/* 105 */
	NONE,	"",		"",		"",		/* 106 */
	NONE,	"",		"",		"",		/* 107 */
	NONE,	"",		"",		"",		/* 108 */
	NONE,	"",		"",		"",		/* 109 */
	NONE,	"",		"",		"",		/* 110 */
	NONE,	"",		"",		"",		/* 111 */
	NONE,	"",		"",		"",		/* 112 */
	NONE,	"",		"",		"",		/* 113 */
	NONE,	"",		"",		"",		/* 114 */
	NONE,	"",		"",		"",		/* 115 */
	NONE,	"",		"",		"",		/* 116 */
	NONE,	"",		"",		"",		/* 117 */
	NONE,	"",		"",		"",		/* 118 */
	NONE,	"",		"",		"",		/* 119 */
	NONE,	"",		"",		"",		/* 120 */
	NONE,	"",		"",		"",		/* 121 */
	NONE,	"",		"",		"",		/* 122 */
	NONE,	"",		"",		"",		/* 123 */
	NONE,	"",		"",		"",		/* 124 */
	NONE,	"",		"",		"",		/* 125 */
	NONE,	"",		"",		"",		/* 126 */
	NONE,	"",		"",		"",		/* 127 */
};

/*
 * Get characters from the keyboard.  If none are present, return NULL.
 */
char *
sget()
{
	u_char dt;
	static u_char extended = 0, shift_state = 0;
	static u_char capchar[2];

top:
	KBD_DELAY;
	dt = inb(KBDATAP);

	switch (dt) {
	case KBR_ACK:
		ack = 1;
		goto loop;
	case KBR_RESEND:
		nak = 1;
		goto loop;
	}

#if 0
	if (pc_xmode > 0) {
#if defined(DDB) && defined(XSERVER_DDB)
		/* F12 enters the debugger while in X mode */
		if (dt == 88)
			Debugger();
#endif
		capchar[0] = dt;
		capchar[1] = 0;
		/*
		 * Check for locking keys.
		 *
		 * XXX Setting the LEDs this way is a bit bogus.  What if the
		 * keyboard has been remapped in X?
		 */
		switch (scan_codes[dt & 0x7f].type) {
		case NUM:
			if (dt & 0x80) {
				shift_state &= ~NUM;
				break;
			}
			if (shift_state & NUM)
				break;
			shift_state |= NUM;
			lock_state ^= NUM;
			async_update();
			break;
		case CAPS:
			if (dt & 0x80) {
				shift_state &= ~CAPS;
				break;
			}
			if (shift_state & CAPS)
				break;
			shift_state |= CAPS;
			lock_state ^= CAPS;
			async_update();
			break;
		case SCROLL:
			if (dt & 0x80) {
				shift_state &= ~SCROLL;
				break;
			}
			if (shift_state & SCROLL)
				break;
			shift_state |= SCROLL;
			lock_state ^= SCROLL;
			if ((lock_state & SCROLL) == 0)
				wakeup((caddr_t)&lock_state);
			async_update();
			break;
		}
		return capchar;
	}
#endif /* 0 */

	switch (dt) {
	case KBR_EXTENDED:
		extended = 1;
		goto loop;
	}

#ifdef DDB
	/*
	 * Check for cntl-alt-esc.
	 */
	if ((dt == 1) && (shift_state & (CTL | ALT)) == (CTL | ALT)) {
		Debugger();
		dt |= 0x80;	/* discard esc (ddb discarded ctl-alt) */
	}
#endif

	/*
	 * Check for make/break.
	 */
	if (dt & 0x80) {
		/*
		 * break
		 */
		dt &= 0x7f;
		switch (scan_codes[dt].type) {
		case NUM:
			shift_state &= ~NUM;
			break;
		case CAPS:
			shift_state &= ~CAPS;
			break;
		case SCROLL:
			shift_state &= ~SCROLL;
			break;
		case SHIFT:
			shift_state &= ~SHIFT;
			break;
		case ALT:
			shift_state &= ~ALT;
			break;
		case CTL:
			shift_state &= ~CTL;
			break;
		}
	} else {
		/*
		 * make
		 */
		switch (scan_codes[dt].type) {
		/*
		 * locking keys
		 */
		case NUM:
			if (shift_state & NUM)
				break;
			shift_state |= NUM;
			lock_state ^= NUM;
			async_update();
			break;
		case CAPS:
			if (shift_state & CAPS)
				break;
			shift_state |= CAPS;
			lock_state ^= CAPS;
			async_update();
			break;
		case SCROLL:
			if (shift_state & SCROLL)
				break;
			shift_state |= SCROLL;
			lock_state ^= SCROLL;
			if ((lock_state & SCROLL) == 0)
				wakeup((caddr_t)&lock_state);
			async_update();
			break;
		/*
		 * non-locking keys
		 */
		case SHIFT:
			shift_state |= SHIFT;
			break;
		case ALT:
			shift_state |= ALT;
			break;
		case CTL:
			shift_state |= CTL;
			break;
		case ASCII:
			/* control has highest priority */
			if (shift_state & CTL)
				capchar[0] = scan_codes[dt].ctl[0];
			else if (shift_state & SHIFT)
				capchar[0] = scan_codes[dt].shift[0];
			else
				capchar[0] = scan_codes[dt].unshift[0];
			if ((lock_state & CAPS) && capchar[0] >= 'a' &&
			    capchar[0] <= 'z') {
				capchar[0] -= ('a' - 'A');
			}
			capchar[0] |= (shift_state & ALT);
			extended = 0;
			return capchar;
		case NONE:
			break;
		case FUNC: {
			char *more_chars;
			if (shift_state & SHIFT)
				more_chars = scan_codes[dt].shift;
			else if (shift_state & CTL)
				more_chars = scan_codes[dt].ctl;
			else
				more_chars = scan_codes[dt].unshift;
			extended = 0;
			return more_chars;
		}
		case KP: {
			char *more_chars;
			if (shift_state & (SHIFT | CTL) ||
			    (lock_state & NUM) == 0 || extended)
				more_chars = scan_codes[dt].shift;
			else
				more_chars = scan_codes[dt].unshift;
			extended = 0;
			return more_chars;
		}
		}
	}

	extended = 0;
loop:
	if ((inb(KBSTATP) & KBS_DIB) == 0)
		return 0;
	goto top;
}


/* ARGSUSED */
int
pccngetc(cookie)
        void *cookie;
{
        register char *cp;

#if 0
        if (pc_xmode > 0)
                return 0;
#endif

        do {
                /* wait for byte */
                while ((inb(KBSTATP) & KBS_DIB) == 0);
                /* see if it's worthwhile */
                cp = sget();
        } while (!cp);
        if (*cp == '\r')
                return '\n';
        return *cp;
}

void
pccnpollc(cookie, on)
        void *cookie;
        int on;
{
	struct pckbd_softc *sc = cookie;

        polling = on;
        if (!on) {
                int s;

                /*
                 * If disabling polling on a device that's been configured,
                 * make sure there are no bytes left in the FIFO, holding up
                 * the interrupt line.  Otherwise we won't get any further
                 * interrupts.
                 */
		if (sc != 0) {
			s = spltty();
			pckbdintr(sc);
			splx(s);
		}
        }
}