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kbd.c revision 1.21
      1 /*	$NetBSD: kbd.c,v 1.21 2002/10/02 05:04:26 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Leo Weppelman
      5  * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/device.h>
     40 #include <sys/ioctl.h>
     41 #include <sys/tty.h>
     42 #include <sys/proc.h>
     43 #include <sys/conf.h>
     44 #include <sys/file.h>
     45 #include <sys/kernel.h>
     46 #include <sys/signalvar.h>
     47 #include <sys/syslog.h>
     48 #include <dev/cons.h>
     49 #include <machine/cpu.h>
     50 #include <machine/iomap.h>
     51 #include <machine/mfp.h>
     52 #include <machine/acia.h>
     53 #include <atari/dev/itevar.h>
     54 #include <atari/dev/event_var.h>
     55 #include <atari/dev/vuid_event.h>
     56 #include <atari/dev/ym2149reg.h>
     57 #include <atari/dev/kbdreg.h>
     58 #include <atari/dev/kbdvar.h>
     59 #include <atari/dev/kbdmap.h>
     60 #include <atari/dev/msvar.h>
     61 
     62 #include "mouse.h"
     63 
     64 u_char			kbd_modifier;	/* Modifier mask		*/
     65 
     66 static u_char		kbd_ring[KBD_RING_SIZE];
     67 static volatile u_int	kbd_rbput = 0;	/* 'put' index			*/
     68 static u_int		kbd_rbget = 0;	/* 'get' index			*/
     69 static u_char		kbd_soft  = 0;	/* 1: Softint has been scheduled*/
     70 
     71 static struct kbd_softc kbd_softc;
     72 
     73 /* {b,c}devsw[] function prototypes */
     74 dev_type_open(kbdopen);
     75 dev_type_close(kbdclose);
     76 dev_type_read(kbdread);
     77 dev_type_ioctl(kbdioctl);
     78 dev_type_poll(kbdpoll);
     79 
     80 /* Interrupt handler */
     81 void	kbdintr __P((int));
     82 
     83 static void kbdsoft __P((void *, void *));
     84 static void kbdattach __P((struct device *, struct device *, void *));
     85 static int  kbdmatch __P((struct device *, struct cfdata *, void *));
     86 static int  kbd_do_modifier __P((u_char));
     87 static int  kbd_write_poll __P((u_char *, int));
     88 static void kbd_pkg_start __P((struct kbd_softc *, u_char));
     89 
     90 CFATTACH_DECL(kbd, sizeof(struct device),
     91     kbdmatch, kbdattach, NULL, NULL);
     92 
     93 const struct cdevsw kbd_cdevsw = {
     94 	kbdopen, kbdclose, kbdread, nowrite, kbdioctl,
     95 	nostop, notty, kbdpoll, nommap,
     96 };
     97 
     98 /*ARGSUSED*/
     99 static	int
    100 kbdmatch(pdp, cfp, auxp)
    101 struct	device	*pdp;
    102 struct	cfdata	*cfp;
    103 void		*auxp;
    104 {
    105 	if (!strcmp((char *)auxp, "kbd"))
    106 		return (1);
    107 	return (0);
    108 }
    109 
    110 /*ARGSUSED*/
    111 static void
    112 kbdattach(pdp, dp, auxp)
    113 struct	device *pdp, *dp;
    114 void	*auxp;
    115 {
    116 	int	timeout;
    117 	u_char	kbd_rst[]  = { 0x80, 0x01 };
    118 	u_char	kbd_icmd[] = { 0x12, 0x15 };
    119 
    120 	/*
    121 	 * Disable keyboard interrupts from MFP
    122 	 */
    123 	MFP->mf_ierb &= ~IB_AINT;
    124 
    125 	/*
    126 	 * Reset ACIA and intialize to:
    127 	 *    divide by 16, 8 data, 1 stop, no parity, enable RX interrupts
    128 	 */
    129 	KBD->ac_cs = A_RESET;
    130 	delay(100);	/* XXX: enough? */
    131 	KBD->ac_cs = kbd_softc.k_soft_cs = KBD_INIT | A_RXINT;
    132 
    133 	/*
    134 	 * Clear error conditions
    135 	 */
    136 	while (KBD->ac_cs & (A_IRQ|A_RXRDY))
    137 		timeout = KBD->ac_da;
    138 
    139 	/*
    140 	 * Now send the reset string, and read+ignore it's response
    141 	 */
    142 	if (!kbd_write_poll(kbd_rst, 2))
    143 		printf("kbd: error cannot reset keyboard\n");
    144 	for (timeout = 1000; timeout > 0; timeout--) {
    145 		if (KBD->ac_cs & (A_IRQ|A_RXRDY)) {
    146 			timeout = KBD->ac_da;
    147 			timeout = 100;
    148 		}
    149 		delay(100);
    150 	}
    151 	/*
    152 	 * Send init command: disable mice & joysticks
    153 	 */
    154 	kbd_write_poll(kbd_icmd, sizeof(kbd_icmd));
    155 
    156 	printf("\n");
    157 }
    158 
    159 void
    160 kbdenable()
    161 {
    162 	int	s, code;
    163 
    164 	s = spltty();
    165 
    166 	/*
    167 	 * Clear error conditions...
    168 	 */
    169 	while (KBD->ac_cs & (A_IRQ|A_RXRDY))
    170 		code = KBD->ac_da;
    171 	/*
    172 	 * Enable interrupts from MFP
    173 	 */
    174 	MFP->mf_iprb  = (u_int8_t)~IB_AINT;
    175 	MFP->mf_ierb |= IB_AINT;
    176 	MFP->mf_imrb |= IB_AINT;
    177 
    178 	kbd_softc.k_event_mode   = 0;
    179 	kbd_softc.k_events.ev_io = 0;
    180 	kbd_softc.k_pkg_size     = 0;
    181 	splx(s);
    182 }
    183 
    184 int kbdopen(dev_t dev, int flags, int mode, struct proc *p)
    185 {
    186 	if (kbd_softc.k_events.ev_io)
    187 		return EBUSY;
    188 
    189 	kbd_softc.k_events.ev_io = p;
    190 	ev_init(&kbd_softc.k_events);
    191 	return (0);
    192 }
    193 
    194 int
    195 kbdclose(dev_t dev, int flags, int mode, struct proc *p)
    196 {
    197 	/* Turn off event mode, dump the queue */
    198 	kbd_softc.k_event_mode = 0;
    199 	ev_fini(&kbd_softc.k_events);
    200 	kbd_softc.k_events.ev_io = NULL;
    201 	return (0);
    202 }
    203 
    204 int
    205 kbdread(dev_t dev, struct uio *uio, int flags)
    206 {
    207 	return ev_read(&kbd_softc.k_events, uio, flags);
    208 }
    209 
    210 int
    211 kbdioctl(dev_t dev,u_long cmd,register caddr_t data,int flag,struct proc *p)
    212 {
    213 	register struct kbd_softc *k = &kbd_softc;
    214 	struct kbdbell	*kb;
    215 
    216 	switch (cmd) {
    217 		case KIOCTRANS:
    218 			if (*(int *)data == TR_UNTRANS_EVENT)
    219 				return 0;
    220 			break;
    221 
    222 		case KIOCGTRANS:
    223 			/*
    224 			 * Get translation mode
    225 			 */
    226 			*(int *)data = TR_UNTRANS_EVENT;
    227 			return 0;
    228 
    229 		case KIOCSDIRECT:
    230 			k->k_event_mode = *(int *)data;
    231 			return 0;
    232 
    233 		case KIOCRINGBELL:
    234 			kb = (struct kbdbell *)data;
    235 			if (kb)
    236 				kbd_bell_sparms(kb->volume, kb->pitch,
    237 							kb->duration);
    238 			kbdbell();
    239 			return 0;
    240 
    241 		case FIONBIO:	/* we will remove this someday (soon???) */
    242 			return 0;
    243 
    244 		case FIOASYNC:
    245 			k->k_events.ev_async = *(int *)data != 0;
    246 				return 0;
    247 
    248 		case TIOCSPGRP:
    249 			if (*(int *)data != k->k_events.ev_io->p_pgid)
    250 				return EPERM;
    251 			return 0;
    252 
    253 		default:
    254 			return ENOTTY;
    255 	}
    256 
    257 	/*
    258 	 * We identified the ioctl, but we do not handle it.
    259 	 */
    260 	return EOPNOTSUPP;		/* misuse, but what the heck */
    261 }
    262 
    263 int
    264 kbdpoll (dev_t dev, int events, struct proc *p)
    265 {
    266   return ev_poll (&kbd_softc.k_events, events, p);
    267 }
    268 
    269 /*
    270  * Keyboard interrupt handler called straight from MFP at spl6.
    271  */
    272 void
    273 kbdintr(sr)
    274 int sr;	/* sr at time of interrupt	*/
    275 {
    276 	int	code;
    277 	int	got_char = 0;
    278 
    279 	/*
    280 	 * There may be multiple keys available. Read them all.
    281 	 */
    282 	while (KBD->ac_cs & (A_RXRDY|A_OE|A_PE)) {
    283 		got_char = 1;
    284 		if (KBD->ac_cs & (A_OE|A_PE)) {
    285 			code = KBD->ac_da;	/* Silently ignore errors */
    286 			continue;
    287 		}
    288 		kbd_ring[kbd_rbput++ & KBD_RING_MASK] = KBD->ac_da;
    289 	}
    290 
    291 	/*
    292 	 * If characters are waiting for transmit, send them.
    293 	 */
    294 	if ((kbd_softc.k_soft_cs & A_TXINT) && (KBD->ac_cs & A_TXRDY)) {
    295 		if (kbd_softc.k_sendp != NULL)
    296 			KBD->ac_da = *kbd_softc.k_sendp++;
    297 		if (--kbd_softc.k_send_cnt <= 0) {
    298 			/*
    299 			 * The total package has been transmitted,
    300 			 * wakeup anyone waiting for it.
    301 			 */
    302 			KBD->ac_cs = (kbd_softc.k_soft_cs &= ~A_TXINT);
    303 			kbd_softc.k_sendp    = NULL;
    304 			kbd_softc.k_send_cnt = 0;
    305 			wakeup((caddr_t)&kbd_softc.k_send_cnt);
    306 		}
    307 	}
    308 
    309 	/*
    310 	 * Activate software-level to handle possible input.
    311 	 */
    312 	if (got_char) {
    313 		if (!BASEPRI(sr)) {
    314 			if (!kbd_soft++)
    315 				add_sicallback(kbdsoft, 0, 0);
    316 		} else {
    317 			spl1();
    318 			kbdsoft(NULL, NULL);
    319 		}
    320 	}
    321 }
    322 
    323 /*
    324  * Keyboard soft interrupt handler
    325  */
    326 void
    327 kbdsoft(junk1, junk2)
    328 void	*junk1, *junk2;
    329 {
    330 	int			s;
    331 	u_char			code;
    332 	struct kbd_softc	*k = &kbd_softc;
    333 	struct firm_event	*fe;
    334 	int			put;
    335 	int			n, get;
    336 
    337 	kbd_soft = 0;
    338 	get      = kbd_rbget;
    339 
    340 	for (;;) {
    341 		n = kbd_rbput;
    342 		if (get == n) /* We're done	*/
    343 			break;
    344 		n -= get;
    345 		if (n > KBD_RING_SIZE) { /* Ring buffer overflow	*/
    346 			get += n - KBD_RING_SIZE;
    347 			n    = KBD_RING_SIZE;
    348 		}
    349 		while (--n >= 0) {
    350 			code = kbd_ring[get++ & KBD_RING_MASK];
    351 
    352 			/*
    353 			 * If collecting a package, stuff it in and
    354 			 * continue.
    355 			 */
    356 			if (k->k_pkg_size && (k->k_pkg_idx < k->k_pkg_size)) {
    357 			    k->k_package[k->k_pkg_idx++] = code;
    358 			    if (k->k_pkg_idx == k->k_pkg_size) {
    359 				/*
    360 				 * Package is complete.
    361 				 */
    362 				switch(k->k_pkg_type) {
    363 #if NMOUSE > 0
    364 				    case KBD_AMS_PKG:
    365 				    case KBD_RMS_PKG:
    366 				    case KBD_JOY1_PKG:
    367 			 		mouse_soft((REL_MOUSE *)k->k_package,
    368 						k->k_pkg_size, k->k_pkg_type);
    369 #endif /* NMOUSE */
    370 				}
    371 				k->k_pkg_size = 0;
    372 			    }
    373 			    continue;
    374 			}
    375 			/*
    376 			 * If this is a package header, init pkg. handling.
    377 			 */
    378 			if (!KBD_IS_KEY(code)) {
    379 				kbd_pkg_start(k, code);
    380 				continue;
    381 			}
    382 			if (kbd_do_modifier(code) && !k->k_event_mode)
    383 				continue;
    384 
    385 			/*
    386 			 * if not in event mode, deliver straight to ite to
    387 			 * process key stroke
    388 			 */
    389 			if (!k->k_event_mode) {
    390 				/* Gets to spltty() by itself	*/
    391 				ite_filter(code, ITEFILT_TTY);
    392 				continue;
    393 			}
    394 
    395 			/*
    396 			 * Keyboard is generating events.  Turn this keystroke
    397 			 * into an event and put it in the queue.  If the queue
    398 			 * is full, the keystroke is lost (sorry!).
    399 			 */
    400 			s = spltty();
    401 			put = k->k_events.ev_put;
    402 			fe  = &k->k_events.ev_q[put];
    403 			put = (put + 1) % EV_QSIZE;
    404 			if (put == k->k_events.ev_get) {
    405 				log(LOG_WARNING,
    406 					"keyboard event queue overflow\n");
    407 				splx(s);
    408 				continue;
    409 			}
    410 			fe->id    = KBD_SCANCODE(code);
    411 			fe->value = KBD_RELEASED(code) ? VKEY_UP : VKEY_DOWN;
    412 			fe->time  = time;
    413 			k->k_events.ev_put = put;
    414 			EV_WAKEUP(&k->k_events);
    415 			splx(s);
    416 		}
    417 		kbd_rbget = get;
    418 	}
    419 }
    420 
    421 static	u_char sound[] = {
    422 	0xA8,0x01,0xA9,0x01,0xAA,0x01,0x00,
    423 	0xF8,0x10,0x10,0x10,0x00,0x20,0x03
    424 };
    425 
    426 void
    427 kbdbell()
    428 {
    429 	register int	i, sps;
    430 
    431 	sps = splhigh();
    432 	for (i = 0; i < sizeof(sound); i++) {
    433 		YM2149->sd_selr = i;
    434 		YM2149->sd_wdat = sound[i];
    435 	}
    436 	splx(sps);
    437 }
    438 
    439 
    440 /*
    441  * Set the parameters of the 'default' beep.
    442  */
    443 
    444 #define KBDBELLCLOCK	125000	/* 2MHz / 16 */
    445 #define KBDBELLDURATION	128	/* 256 / 2MHz */
    446 
    447 void
    448 kbd_bell_gparms(volume, pitch, duration)
    449 	u_int	*volume, *pitch, *duration;
    450 {
    451 	u_int	tmp;
    452 
    453 	tmp = sound[11] | (sound[12] << 8);
    454 	*duration = (tmp * KBDBELLDURATION) / 1000;
    455 
    456 	tmp = sound[0] | (sound[1] << 8);
    457 	*pitch = KBDBELLCLOCK / tmp;
    458 
    459 	*volume = 0;
    460 }
    461 
    462 void
    463 kbd_bell_sparms(volume, pitch, duration)
    464 	u_int	volume, pitch, duration;
    465 {
    466 	u_int	f, t;
    467 
    468 	f = pitch > 10 ? pitch : 10;	/* minimum pitch */
    469 	if (f > 20000)
    470 		f = 20000;		/* maximum pitch */
    471 
    472 	f = KBDBELLCLOCK / f;
    473 
    474 	t = (duration * 1000) / KBDBELLDURATION;
    475 
    476 	sound[ 0] = f & 0xff;
    477 	sound[ 1] = (f >> 8) & 0xf;
    478 	f -= 1;
    479 	sound[ 2] = f & 0xff;
    480 	sound[ 3] = (f >> 8) & 0xf;
    481 	f += 2;
    482 	sound[ 4] = f & 0xff;
    483 	sound[ 5] = (f >> 8) & 0xf;
    484 
    485 	sound[11] = t & 0xff;
    486 	sound[12] = (t >> 8) & 0xff;
    487 
    488 	sound[13] = 0x03;
    489 }
    490 
    491 int
    492 kbdgetcn()
    493 {
    494 	u_char	code;
    495 	int	s = spltty();
    496 	int	ints_active;
    497 
    498 	ints_active = 0;
    499 	if (MFP->mf_imrb & IB_AINT) {
    500 		ints_active   = 1;
    501 		MFP->mf_imrb &= ~IB_AINT;
    502 	}
    503 	for (;;) {
    504 		while (!((KBD->ac_cs & (A_IRQ|A_RXRDY)) == (A_IRQ|A_RXRDY)))
    505 			;	/* Wait for key	*/
    506 		if (KBD->ac_cs & (A_OE|A_PE)) {
    507 			code = KBD->ac_da;	/* Silently ignore errors */
    508 			continue;
    509 		}
    510 		code = KBD->ac_da;
    511 		if (!kbd_do_modifier(code))
    512 			break;
    513 	}
    514 
    515 	if (ints_active) {
    516 		MFP->mf_iprb  = (u_int8_t)~IB_AINT;
    517 		MFP->mf_imrb |=  IB_AINT;
    518 	}
    519 
    520 	splx (s);
    521 	return code;
    522 }
    523 
    524 /*
    525  * Write a command to the keyboard in 'polled' mode.
    526  */
    527 static int
    528 kbd_write_poll(cmd, len)
    529 u_char	*cmd;
    530 int	len;
    531 {
    532 	int	timeout;
    533 
    534 	while (len-- > 0) {
    535 		KBD->ac_da = *cmd++;
    536 		for (timeout = 100; !(KBD->ac_cs & A_TXRDY); timeout--)
    537 			delay(10);
    538 		if (!(KBD->ac_cs & A_TXRDY))
    539 			return (0);
    540 	}
    541 	return (1);
    542 }
    543 
    544 /*
    545  * Write a command to the keyboard. Return when command is send.
    546  */
    547 void
    548 kbd_write(cmd, len)
    549 u_char	*cmd;
    550 int	len;
    551 {
    552 	struct kbd_softc	*k = &kbd_softc;
    553 	int			sps;
    554 
    555 	/*
    556 	 * Get to splhigh, 'real' interrupts arrive at spl6!
    557 	 */
    558 	sps = splhigh();
    559 
    560 	/*
    561 	 * Make sure any privious write has ended...
    562 	 */
    563 	while (k->k_sendp != NULL)
    564 		tsleep((caddr_t)&k->k_sendp, TTOPRI, "kbd_write1", 0);
    565 
    566 	/*
    567 	 * If the KBD-acia is not currently busy, send the first
    568 	 * character now.
    569 	 */
    570 	KBD->ac_cs = (k->k_soft_cs |= A_TXINT);
    571 	if (KBD->ac_cs & A_TXRDY) {
    572 		KBD->ac_da = *cmd++;
    573 		len--;
    574 	}
    575 
    576 	/*
    577 	 * If we're not yet done, wait until all characters are send.
    578 	 */
    579 	if (len > 0) {
    580 		k->k_sendp    = cmd;
    581 		k->k_send_cnt = len;
    582 		tsleep((caddr_t)&k->k_send_cnt, TTOPRI, "kbd_write2", 0);
    583 	}
    584 	splx(sps);
    585 
    586 	/*
    587 	 * Wakeup all procs waiting for us.
    588 	 */
    589 	wakeup((caddr_t)&k->k_sendp);
    590 }
    591 
    592 /*
    593  * Setup softc-fields to assemble a keyboard package.
    594  */
    595 static void
    596 kbd_pkg_start(kp, msg_start)
    597 struct kbd_softc *kp;
    598 u_char		 msg_start;
    599 {
    600 	kp->k_pkg_idx    = 1;
    601 	kp->k_package[0] = msg_start;
    602 	switch (msg_start) {
    603 		case 0xf6:
    604 			kp->k_pkg_type = KBD_MEM_PKG;
    605 			kp->k_pkg_size = 8;
    606 			break;
    607 		case 0xf7:
    608 			kp->k_pkg_type = KBD_AMS_PKG;
    609 			kp->k_pkg_size = 6;
    610 			break;
    611 		case 0xf8:
    612 		case 0xf9:
    613 		case 0xfa:
    614 		case 0xfb:
    615 			kp->k_pkg_type = KBD_RMS_PKG;
    616 			kp->k_pkg_size = 3;
    617 			break;
    618 		case 0xfc:
    619 			kp->k_pkg_type = KBD_CLK_PKG;
    620 			kp->k_pkg_size = 7;
    621 			break;
    622 		case 0xfe:
    623 			kp->k_pkg_type = KBD_JOY0_PKG;
    624 			kp->k_pkg_size = 2;
    625 			break;
    626 		case 0xff:
    627 			kp->k_pkg_type = KBD_JOY1_PKG;
    628 			kp->k_pkg_size = 2;
    629 			break;
    630 		default:
    631 			printf("kbd: Unknown packet 0x%x\n", msg_start);
    632 			break;
    633 	}
    634 }
    635 
    636 /*
    637  * Modifier processing
    638  */
    639 static int
    640 kbd_do_modifier(code)
    641 u_char	code;
    642 {
    643 	u_char	up, mask;
    644 
    645 	up   = KBD_RELEASED(code);
    646 	mask = 0;
    647 
    648 	switch(KBD_SCANCODE(code)) {
    649 		case KBD_LEFT_SHIFT:
    650 			mask = KBD_MOD_LSHIFT;
    651 			break;
    652 		case KBD_RIGHT_SHIFT:
    653 			mask = KBD_MOD_RSHIFT;
    654 			break;
    655 		case KBD_CTRL:
    656 			mask = KBD_MOD_CTRL;
    657 			break;
    658 		case KBD_ALT:
    659 			mask = KBD_MOD_ALT;
    660 			break;
    661 		case KBD_CAPS_LOCK:
    662 			/* CAPSLOCK is a toggle */
    663 			if(!up)
    664 				kbd_modifier ^= KBD_MOD_CAPS;
    665 			return 1;
    666 	}
    667 	if(mask) {
    668 		if(up)
    669 			kbd_modifier &= ~mask;
    670 		else
    671 			kbd_modifier |= mask;
    672 		return 1;
    673 	}
    674 	return 0;
    675 }
    676