freebsd-dev/sys/dev/speaker/spkr.c
Ed Schouten 8d456252aa Remove unneeded checks of device unit number from speaker(4).
Calls on the cdev can only be made on existing devices. This means we
don't have to check the value of dev2unit().
2009-01-25 09:20:59 +00:00

552 lines
13 KiB
C

/*-
* spkr.c -- device driver for console speaker
*
* v1.4 by Eric S. Raymond (esr@snark.thyrsus.com) Aug 1993
* modified for FreeBSD by Andrew A. Chernov <ache@astral.msk.su>
* modified for PC98 by Kakefuda
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/uio.h>
#include <sys/conf.h>
#include <sys/ctype.h>
#include <sys/malloc.h>
#include <machine/clock.h>
#include <dev/speaker/speaker.h>
static d_open_t spkropen;
static d_close_t spkrclose;
static d_write_t spkrwrite;
static d_ioctl_t spkrioctl;
static struct cdevsw spkr_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = spkropen,
.d_close = spkrclose,
.d_write = spkrwrite,
.d_ioctl = spkrioctl,
.d_name = "spkr",
};
static MALLOC_DEFINE(M_SPKR, "spkr", "Speaker buffer");
/*
**************** MACHINE DEPENDENT PART STARTS HERE *************************
* This section defines a function tone() which causes a tone of given
* frequency and duration from the ISA console speaker.
* Another function endtone() is defined to force sound off, and there is
* also a rest() entry point to do pauses.
*
* Audible sound is generated using the Programmable Interval Timer (PIT) and
* Programmable Peripheral Interface (PPI) attached to the ISA speaker. The
* PPI controls whether sound is passed through at all; the PIT's channel 2 is
* used to generate clicks (a square wave) of whatever frequency is desired.
*/
#define SPKRPRI PSOCK
static char endtone, endrest;
static void tone(unsigned int thz, unsigned int centisecs);
static void rest(int centisecs);
static void playinit(void);
static void playtone(int pitch, int value, int sustain);
static void playstring(char *cp, size_t slen);
/*
* Emit tone of frequency thz for given number of centisecs
*/
static void
tone(unsigned int thz, unsigned int centisecs)
{
int sps, timo;
if (thz <= 0)
return;
#ifdef DEBUG
(void) printf("tone: thz=%d centisecs=%d\n", thz, centisecs);
#endif /* DEBUG */
/* set timer to generate clicks at given frequency in Hertz */
sps = splclock();
if (timer_spkr_acquire()) {
/* enter list of waiting procs ??? */
splx(sps);
return;
}
splx(sps);
disable_intr();
timer_spkr_setfreq(thz);
enable_intr();
/*
* Set timeout to endtone function, then give up the timeslice.
* This is so other processes can execute while the tone is being
* emitted.
*/
timo = centisecs * hz / 100;
if (timo > 0)
tsleep(&endtone, SPKRPRI | PCATCH, "spkrtn", timo);
sps = splclock();
timer_spkr_release();
splx(sps);
}
/*
* Rest for given number of centisecs
*/
static void
rest(int centisecs)
{
int timo;
/*
* 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 DEBUG
(void) printf("rest: %d\n", centisecs);
#endif /* DEBUG */
timo = centisecs * hz / 100;
if (timo > 0)
tsleep(&endrest, SPKRPRI | PCATCH, "spkrrs", timo);
}
/*
**************** PLAY STRING INTERPRETER BEGINS HERE **********************
* Play string interpretation is modelled on IBM BASIC 2.0's PLAY statement;
* M[LNS] are missing; the ~ synonym and the _ slur mark and the octave-
* tracking facility are added.
* Requires tone(), rest(), and endtone(). String play is not interruptible
* except possibly at physical block boundaries.
*/
typedef int bool;
#define TRUE 1
#define FALSE 0
#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 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 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,
};
static void
playinit()
{
octave = DFLT_OCTAVE;
whole = (100 * 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) */
}
/*
* Play tone of proper duration for current rhythm signature
*/
static void
playtone(int pitch, int value, int sustain)
{
register int sound, silence, snum = 1, sdenom = 1;
/* this weirdness avoids floating-point arithmetic */
for (; sustain; sustain--) {
/* See the BUGS section in the man page for discussion */
snum *= NUM_MULT;
sdenom *= DENOM_MULT;
}
if (value == 0 || sdenom == 0)
return;
if (pitch == -1)
rest(whole * snum / (value * sdenom));
else {
sound = (whole * snum) / (value * sdenom)
- (whole * (FILLTIME - fill)) / (value * FILLTIME);
silence = whole * (FILLTIME-fill) * snum / (FILLTIME * value * sdenom);
#ifdef DEBUG
(void) printf("playtone: pitch %d for %d ticks, rest for %d ticks\n",
pitch, sound, silence);
#endif /* DEBUG */
tone(pitchtab[pitch], sound);
if (fill != LEGATO)
rest(silence);
}
}
/*
* Interpret and play an item from a notation string
*/
static void
playstring(char *cp, size_t slen)
{
int pitch, oldfill, lastpitch = OCTAVE_NOTES * DFLT_OCTAVE;
#define GETNUM(cp, v) for(v=0; isdigit(cp[1]) && slen > 0; ) \
{v = v * 10 + (*++cp - '0'); slen--;}
for (; slen--; cp++) {
int sustain, timeval, tempo;
register char c = toupper(*cp);
#ifdef DEBUG
(void) printf("playstring: %c (%x)\n", c, c);
#endif /* DEBUG */
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 (cp[1] == '#' || cp[1] == '+') {
++pitch;
++cp;
slen--;
} else if (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)) {
++octave;
pitch += OCTAVE_NOTES;
}
if (abs(pitch-lastpitch) > abs((pitch-OCTAVE_NOTES) -
lastpitch)) {
--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; cp[1] == '.'; cp++) {
slen--;
sustain++;
}
/* ...and/or a slur mark */
oldfill = fill;
if (cp[1] == '_') {
fill = LEGATO;
++cp;
slen--;
}
/* time to emit the actual tone */
playtone(pitch, timeval, sustain);
fill = oldfill;
break;
case 'O':
if (cp[1] == 'N' || cp[1] == 'n') {
octprefix = octtrack = FALSE;
++cp;
slen--;
} else if (cp[1] == 'L' || cp[1] == 'l') {
octtrack = TRUE;
++cp;
slen--;
} else {
GETNUM(cp, octave);
if (octave >= sizeof(pitchtab) / sizeof(pitchtab[0]) /
OCTAVE_NOTES)
octave = DFLT_OCTAVE;
octprefix = TRUE;
}
break;
case '>':
if (octave < sizeof(pitchtab) / sizeof(pitchtab[0]) /
OCTAVE_NOTES - 1)
octave++;
octprefix = TRUE;
break;
case '<':
if (octave > 0)
octave--;
octprefix = TRUE;
break;
case 'N':
GETNUM(cp, pitch);
for (sustain = 0; cp[1] == '.'; cp++) {
slen--;
sustain++;
}
oldfill = fill;
if (cp[1] == '_') {
fill = LEGATO;
++cp;
slen--;
}
playtone(pitch - 1, value, sustain);
fill = oldfill;
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; 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 = (100 * SECS_PER_MIN * WHOLE_NOTE) / tempo;
break;
case 'M':
if (cp[1] == 'N' || cp[1] == 'n') {
fill = NORMAL;
++cp;
slen--;
} else if (cp[1] == 'L' || cp[1] == 'l') {
fill = LEGATO;
++cp;
slen--;
} else if (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 = FALSE; /* exclusion flag */
static char *spkr_inbuf; /* incoming buf */
static int
spkropen(dev, flags, fmt, td)
struct cdev *dev;
int flags;
int fmt;
struct thread *td;
{
#ifdef DEBUG
(void) printf("spkropen: entering with dev = %s\n", devtoname(dev));
#endif /* DEBUG */
if (spkr_active)
return(EBUSY);
else {
#ifdef DEBUG
(void) printf("spkropen: about to perform play initialization\n");
#endif /* DEBUG */
playinit();
spkr_inbuf = malloc(DEV_BSIZE, M_SPKR, M_WAITOK);
spkr_active = TRUE;
return(0);
}
}
static int
spkrwrite(dev, uio, ioflag)
struct cdev *dev;
struct uio *uio;
int ioflag;
{
#ifdef DEBUG
printf("spkrwrite: entering with dev = %s, count = %d\n",
devtoname(dev), uio->uio_resid);
#endif /* DEBUG */
if (uio->uio_resid > (DEV_BSIZE - 1)) /* prevent system crashes */
return(E2BIG);
else {
unsigned n;
char *cp;
int error;
n = uio->uio_resid;
cp = spkr_inbuf;
error = uiomove(cp, n, uio);
if (!error) {
cp[n] = '\0';
playstring(cp, n);
}
return(error);
}
}
static int
spkrclose(dev, flags, fmt, td)
struct cdev *dev;
int flags;
int fmt;
struct thread *td;
{
#ifdef DEBUG
(void) printf("spkrclose: entering with dev = %s\n", devtoname(dev));
#endif /* DEBUG */
wakeup(&endtone);
wakeup(&endrest);
free(spkr_inbuf, M_SPKR);
spkr_active = FALSE;
return(0);
}
static int
spkrioctl(dev, cmd, cmdarg, flags, td)
struct cdev *dev;
unsigned long cmd;
caddr_t cmdarg;
int flags;
struct thread *td;
{
#ifdef DEBUG
(void) printf("spkrioctl: entering with dev = %s, cmd = %lx\n",
devtoname(dev), cmd);
#endif /* DEBUG */
if (cmd == SPKRTONE) {
tone_t *tp = (tone_t *)cmdarg;
if (tp->frequency == 0)
rest(tp->duration);
else
tone(tp->frequency, tp->duration);
return 0;
} else if (cmd == SPKRTUNE) {
tone_t *tp = (tone_t *)(*(caddr_t *)cmdarg);
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);
}
return(0);
}
return(EINVAL);
}
static struct cdev *speaker_dev;
/*
* Module handling
*/
static int
speaker_modevent(module_t mod, int type, void *data)
{
int error = 0;
switch(type) {
case MOD_LOAD:
speaker_dev = make_dev(&spkr_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0600, "speaker");
break;
case MOD_SHUTDOWN:
case MOD_UNLOAD:
destroy_dev(speaker_dev);
break;
default:
error = EOPNOTSUPP;
}
return (error);
}
DEV_MODULE(speaker, speaker_modevent, NULL);