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NetBSD/sys/dev/isa/spkr.c

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/* $NetBSD: spkr.c,v 1.33 2012/04/06 20:16:58 plunky Exp $ */
/*
* Copyright (c) 1990 Eric S. Raymond (esr@snark.thyrsus.com)
* Copyright (c) 1990 Andrew A. Chernov (ache@astral.msk.su)
* Copyright (c) 1990 Lennart Augustsson (lennart@augustsson.net)
* All rights reserved.
*
* 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 Eric S. Raymond
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* spkr.c -- device driver for console speaker on 80386
*
* v1.1 by Eric S. Raymond (esr@snark.thyrsus.com) Feb 1990
* modified for 386bsd by Andrew A. Chernov <ache@astral.msk.su>
* 386bsd only clean version, all SYSV stuff removed
* use hz value from param.c
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: spkr.c,v 1.33 2012/04/06 20:16:58 plunky Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <dev/isa/pcppivar.h>
#include <dev/isa/spkrio.h>
int spkrprobe(device_t, cfdata_t, void *);
void spkrattach(device_t, device_t, void *);
CFATTACH_DECL_NEW(spkr, 0,
spkrprobe, spkrattach, NULL, NULL);
dev_type_open(spkropen);
dev_type_close(spkrclose);
dev_type_write(spkrwrite);
dev_type_ioctl(spkrioctl);
const struct cdevsw spkr_cdevsw = {
spkropen, spkrclose, noread, spkrwrite, spkrioctl,
nostop, notty, nopoll, nommap, nokqfilter, D_OTHER,
};
static pcppi_tag_t ppicookie;
#define SPKRPRI (PZERO - 1)
static void tone(u_int, u_int);
static void rest(int);
static void playinit(void);
static void playtone(int, int, int);
static void playstring(char *, int);
static void
tone(u_int xhz, u_int ticks)
/* emit tone of frequency hz for given number of ticks */
{
pcppi_bell(ppicookie, xhz, ticks, PCPPI_BELL_SLEEP);
}
static void
rest(int ticks)
/* rest for given number of ticks */
{
/*
* Set timeout to endrest function, then give up the timeslice.
* This is so other processes can execute while the rest is being
* waited out.
*/
#ifdef SPKRDEBUG
printf("rest: %d\n", ticks);
#endif /* SPKRDEBUG */
if (ticks > 0)
tsleep(rest, SPKRPRI | PCATCH, "rest", ticks);
}
/**************** PLAY STRING INTERPRETER BEGINS HERE **********************
*
* Play string interpretation is modelled on IBM BASIC 2.0's PLAY statement;
* M[LNS] are missing and the ~ synonym and octave-tracking facility is added.
* Requires tone(), rest(), and endtone(). String play is not interruptible
* except possibly at physical block boundaries.
*/
#define dtoi(c) ((c) - '0')
static int octave; /* currently selected octave */
static int whole; /* whole-note time at current tempo, in ticks */
static int value; /* whole divisor for note time, quarter note = 1 */
static int fill; /* controls spacing of notes */
static bool octtrack; /* octave-tracking on? */
static bool octprefix; /* override current octave-tracking state? */
/*
* Magic number avoidance...
*/
#define SECS_PER_MIN 60 /* seconds per minute */
#define WHOLE_NOTE 4 /* quarter notes per whole note */
#define MIN_VALUE 64 /* the most we can divide a note by */
#define DFLT_VALUE 4 /* default value (quarter-note) */
#define FILLTIME 8 /* for articulation, break note in parts */
#define STACCATO 6 /* 6/8 = 3/4 of note is filled */
#define NORMAL 7 /* 7/8ths of note interval is filled */
#define LEGATO 8 /* all of note interval is filled */
#define DFLT_OCTAVE 4 /* default octave */
#define MIN_TEMPO 32 /* minimum tempo */
#define DFLT_TEMPO 120 /* default tempo */
#define MAX_TEMPO 255 /* max tempo */
#define NUM_MULT 3 /* numerator of dot multiplier */
#define DENOM_MULT 2 /* denominator of dot multiplier */
/* letter to half-tone: A B C D E F G */
static const int notetab[8] = {9, 11, 0, 2, 4, 5, 7};
/*
* This is the American Standard A440 Equal-Tempered scale with frequencies
* rounded to nearest integer. Thank Goddess for the good ol' CRC Handbook...
* our octave 0 is standard octave 2.
*/
#define OCTAVE_NOTES 12 /* semitones per octave */
static const int pitchtab[] =
{
/* C C# D D# E F F# G G# A A# B*/
/* 0 */ 65, 69, 73, 78, 82, 87, 93, 98, 103, 110, 117, 123,
/* 1 */ 131, 139, 147, 156, 165, 175, 185, 196, 208, 220, 233, 247,
/* 2 */ 262, 277, 294, 311, 330, 349, 370, 392, 415, 440, 466, 494,
/* 3 */ 523, 554, 587, 622, 659, 698, 740, 784, 831, 880, 932, 988,
/* 4 */ 1047, 1109, 1175, 1245, 1319, 1397, 1480, 1568, 1661, 1760, 1865, 1975,
/* 5 */ 2093, 2217, 2349, 2489, 2637, 2794, 2960, 3136, 3322, 3520, 3729, 3951,
/* 6 */ 4186, 4435, 4698, 4978, 5274, 5588, 5920, 6272, 6644, 7040, 7459, 7902,
};
#define NOCTAVES (__arraycount(pitchtab) / OCTAVE_NOTES)
static void
playinit(void)
{
octave = DFLT_OCTAVE;
whole = (hz * SECS_PER_MIN * WHOLE_NOTE) / DFLT_TEMPO;
fill = NORMAL;
value = DFLT_VALUE;
octtrack = false;
octprefix = true; /* act as though there was an initial O(n) */
}
static void
playtone(int pitch, int val, int sustain)
/* play tone of proper duration for current rhythm signature */
{
int sound, silence, snum = 1, sdenom = 1;
/* this weirdness avoids floating-point arithmetic */
for (; sustain; sustain--)
{
snum *= NUM_MULT;
sdenom *= DENOM_MULT;
}
if (pitch == -1)
rest(whole * snum / (val * sdenom));
else
{
sound = (whole * snum) / (val * sdenom)
- (whole * (FILLTIME - fill)) / (val * FILLTIME);
silence = whole * (FILLTIME-fill) * snum / (FILLTIME * val * sdenom);
#ifdef SPKRDEBUG
printf("playtone: pitch %d for %d ticks, rest for %d ticks\n",
pitch, sound, silence);
#endif /* SPKRDEBUG */
tone(pitchtab[pitch], sound);
if (fill != LEGATO)
rest(silence);
}
}
static void
playstring(char *cp, int slen)
/* interpret and play an item from a notation string */
{
int pitch, lastpitch = OCTAVE_NOTES * DFLT_OCTAVE;
#define GETNUM(cp, v) for(v=0; slen > 0 && isdigit(cp[1]); ) \
{v = v * 10 + (*++cp - '0'); slen--;}
for (; slen--; cp++)
{
int sustain, timeval, tempo;
char c = toupper(*cp);
#ifdef SPKRDEBUG
printf("playstring: %c (%x)\n", c, c);
#endif /* SPKRDEBUG */
switch (c)
{
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G':
/* compute pitch */
pitch = notetab[c - 'A'] + octave * OCTAVE_NOTES;
/* this may be followed by an accidental sign */
if (slen > 0 && (cp[1] == '#' || cp[1] == '+'))
{
++pitch;
++cp;
slen--;
}
else if (slen > 0 && cp[1] == '-')
{
--pitch;
++cp;
slen--;
}
/*
* If octave-tracking mode is on, and there has been no octave-
* setting prefix, find the version of the current letter note
* closest to the last regardless of octave.
*/
if (octtrack && !octprefix)
{
if (abs(pitch-lastpitch) > abs(pitch+OCTAVE_NOTES-lastpitch))
{
if (octave < NOCTAVES - 1) {
++octave;
pitch += OCTAVE_NOTES;
}
}
if (abs(pitch-lastpitch) > abs((pitch-OCTAVE_NOTES)-lastpitch))
{
if (octave > 0) {
--octave;
pitch -= OCTAVE_NOTES;
}
}
}
octprefix = false;
lastpitch = pitch;
/* ...which may in turn be followed by an override time value */
GETNUM(cp, timeval);
if (timeval <= 0 || timeval > MIN_VALUE)
timeval = value;
/* ...and/or sustain dots */
for (sustain = 0; slen > 0 && cp[1] == '.'; cp++)
{
slen--;
sustain++;
}
/* time to emit the actual tone */
playtone(pitch, timeval, sustain);
break;
case 'O':
if (slen > 0 && (cp[1] == 'N' || cp[1] == 'n'))
{
octprefix = octtrack = false;
++cp;
slen--;
}
else if (slen > 0 && (cp[1] == 'L' || cp[1] == 'l'))
{
octtrack = true;
++cp;
slen--;
}
else
{
GETNUM(cp, octave);
if (octave >= NOCTAVES)
octave = DFLT_OCTAVE;
octprefix = true;
}
break;
case '>':
if (octave < NOCTAVES - 1)
octave++;
octprefix = true;
break;
case '<':
if (octave > 0)
octave--;
octprefix = true;
break;
case 'N':
GETNUM(cp, pitch);
for (sustain = 0; slen > 0 && cp[1] == '.'; cp++)
{
slen--;
sustain++;
}
playtone(pitch - 1, value, sustain);
break;
case 'L':
GETNUM(cp, value);
if (value <= 0 || value > MIN_VALUE)
value = DFLT_VALUE;
break;
case 'P':
case '~':
/* this may be followed by an override time value */
GETNUM(cp, timeval);
if (timeval <= 0 || timeval > MIN_VALUE)
timeval = value;
for (sustain = 0; slen > 0 && cp[1] == '.'; cp++)
{
slen--;
sustain++;
}
playtone(-1, timeval, sustain);
break;
case 'T':
GETNUM(cp, tempo);
if (tempo < MIN_TEMPO || tempo > MAX_TEMPO)
tempo = DFLT_TEMPO;
whole = (hz * SECS_PER_MIN * WHOLE_NOTE) / tempo;
break;
case 'M':
if (slen > 0 && (cp[1] == 'N' || cp[1] == 'n'))
{
fill = NORMAL;
++cp;
slen--;
}
else if (slen > 0 && (cp[1] == 'L' || cp[1] == 'l'))
{
fill = LEGATO;
++cp;
slen--;
}
else if (slen > 0 && (cp[1] == 'S' || cp[1] == 's'))
{
fill = STACCATO;
++cp;
slen--;
}
break;
}
}
}
/******************* UNIX DRIVER HOOKS BEGIN HERE **************************
*
* This section implements driver hooks to run playstring() and the tone(),
* endtone(), and rest() functions defined above.
*/
static int spkr_active; /* exclusion flag */
static void *spkr_inbuf;
static int spkr_attached = 0;
int
spkrprobe(device_t parent, cfdata_t match, void *aux)
{
return (!spkr_attached);
}
void
spkrattach(device_t parent, device_t self, void *aux)
{
printf("\n");
ppicookie = ((struct pcppi_attach_args *)aux)->pa_cookie;
spkr_attached = 1;
if (!pmf_device_register(self, NULL, NULL))
aprint_error_dev(self, "couldn't establish power handler\n");
}
int
spkropen(dev_t dev, int flags, int mode, struct lwp *l)
{
#ifdef SPKRDEBUG
printf("spkropen: entering with dev = %"PRIx64"\n", dev);
#endif /* SPKRDEBUG */
if (minor(dev) != 0 || !spkr_attached)
return(ENXIO);
else if (spkr_active)
return(EBUSY);
else
{
playinit();
spkr_inbuf = malloc(DEV_BSIZE, M_DEVBUF, M_WAITOK);
spkr_active = 1;
}
return(0);
}
int
spkrwrite(dev_t dev, struct uio *uio, int flags)
{
int n;
int error;
#ifdef SPKRDEBUG
printf("spkrwrite: entering with dev = %"PRIx64", count = %zu\n",
dev, uio->uio_resid);
#endif /* SPKRDEBUG */
if (minor(dev) != 0)
return(ENXIO);
else
{
n = min(DEV_BSIZE, uio->uio_resid);
error = uiomove(spkr_inbuf, n, uio);
if (!error)
playstring((char *)spkr_inbuf, n);
return(error);
}
}
int
spkrclose(dev_t dev, int flags, int mode, struct lwp *l)
{
#ifdef SPKRDEBUG
printf("spkrclose: entering with dev = %"PRIx64"\n", dev);
#endif /* SPKRDEBUG */
if (minor(dev) != 0)
return(ENXIO);
else
{
tone(0, 0);
free(spkr_inbuf, M_DEVBUF);
spkr_active = 0;
}
return(0);
}
int
spkrioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
#ifdef SPKRDEBUG
printf("spkrioctl: entering with dev = %"PRIx64", cmd = %lx\n", dev, cmd);
#endif /* SPKRDEBUG */
if (minor(dev) != 0)
return(ENXIO);
else if (cmd == SPKRTONE)
{
tone_t *tp = (tone_t *)data;
if (tp->frequency == 0)
rest(tp->duration);
else
tone(tp->frequency, tp->duration);
}
else if (cmd == SPKRTUNE)
{
tone_t *tp = (tone_t *)(*(void **)data);
tone_t ttp;
int error;
for (; ; tp++) {
error = copyin(tp, &ttp, sizeof(tone_t));
if (error)
return(error);
if (ttp.duration == 0)
break;
if (ttp.frequency == 0)
rest(ttp.duration);
else
tone(ttp.frequency, ttp.duration);
}
}
else
return(EINVAL);
return(0);
}
/* spkr.c ends here */
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