529 lines
13 KiB
C
529 lines
13 KiB
C
/*-
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* spkr.c -- device driver for console speaker
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*
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* v1.4 by Eric S. Raymond (esr@snark.thyrsus.com) Aug 1993
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* modified for FreeBSD by Andrew A. Chernov <ache@astral.msk.su>
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* modified for PC98 by Kakefuda
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/uio.h>
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#include <sys/conf.h>
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#include <sys/ctype.h>
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#include <sys/malloc.h>
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#include <machine/clock.h>
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#include <dev/speaker/speaker.h>
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static d_open_t spkropen;
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static d_close_t spkrclose;
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static d_write_t spkrwrite;
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static d_ioctl_t spkrioctl;
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static struct cdevsw spkr_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = spkropen,
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.d_close = spkrclose,
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.d_write = spkrwrite,
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.d_ioctl = spkrioctl,
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.d_name = "spkr",
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};
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static MALLOC_DEFINE(M_SPKR, "spkr", "Speaker buffer");
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/*
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**************** MACHINE DEPENDENT PART STARTS HERE *************************
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* This section defines a function tone() which causes a tone of given
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* frequency and duration from the ISA console speaker.
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* Another function endtone() is defined to force sound off, and there is
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* also a rest() entry point to do pauses.
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*
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* Audible sound is generated using the Programmable Interval Timer (PIT) and
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* Programmable Peripheral Interface (PPI) attached to the ISA speaker. The
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* PPI controls whether sound is passed through at all; the PIT's channel 2 is
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* used to generate clicks (a square wave) of whatever frequency is desired.
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*/
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#define SPKRPRI PSOCK
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static char endtone, endrest;
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static void tone(unsigned int thz, unsigned int centisecs);
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static void rest(int centisecs);
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static void playinit(void);
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static void playtone(int pitch, int value, int sustain);
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static void playstring(char *cp, size_t slen);
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/*
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* Emit tone of frequency thz for given number of centisecs
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*/
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static void
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tone(unsigned int thz, unsigned int centisecs)
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{
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int timo;
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if (thz <= 0)
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return;
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#ifdef DEBUG
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(void) printf("tone: thz=%d centisecs=%d\n", thz, centisecs);
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#endif /* DEBUG */
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/* set timer to generate clicks at given frequency in Hertz */
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if (timer_spkr_acquire()) {
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/* enter list of waiting procs ??? */
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return;
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}
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disable_intr();
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timer_spkr_setfreq(thz);
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enable_intr();
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/*
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* Set timeout to endtone function, then give up the timeslice.
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* This is so other processes can execute while the tone is being
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* emitted.
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*/
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timo = centisecs * hz / 100;
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if (timo > 0)
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tsleep(&endtone, SPKRPRI | PCATCH, "spkrtn", timo);
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timer_spkr_release();
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}
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/*
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* Rest for given number of centisecs
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*/
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static void
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rest(int centisecs)
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{
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int timo;
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/*
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* Set timeout to endrest function, then give up the timeslice.
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* This is so other processes can execute while the rest is being
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* waited out.
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*/
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#ifdef DEBUG
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(void) printf("rest: %d\n", centisecs);
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#endif /* DEBUG */
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timo = centisecs * hz / 100;
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if (timo > 0)
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tsleep(&endrest, SPKRPRI | PCATCH, "spkrrs", timo);
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}
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/*
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**************** PLAY STRING INTERPRETER BEGINS HERE **********************
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* Play string interpretation is modelled on IBM BASIC 2.0's PLAY statement;
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* M[LNS] are missing; the ~ synonym and the _ slur mark and the octave-
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* tracking facility are added.
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* Requires tone(), rest(), and endtone(). String play is not interruptible
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* except possibly at physical block boundaries.
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*/
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#ifndef __bool_true_false_are_defined
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typedef int bool;
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#endif
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#define TRUE 1
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#define FALSE 0
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#define dtoi(c) ((c) - '0')
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static int octave; /* currently selected octave */
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static int whole; /* whole-note time at current tempo, in ticks */
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static int value; /* whole divisor for note time, quarter note = 1 */
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static int fill; /* controls spacing of notes */
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static bool octtrack; /* octave-tracking on? */
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static bool octprefix; /* override current octave-tracking state? */
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/*
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* Magic number avoidance...
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*/
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#define SECS_PER_MIN 60 /* seconds per minute */
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#define WHOLE_NOTE 4 /* quarter notes per whole note */
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#define MIN_VALUE 64 /* the most we can divide a note by */
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#define DFLT_VALUE 4 /* default value (quarter-note) */
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#define FILLTIME 8 /* for articulation, break note in parts */
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#define STACCATO 6 /* 6/8 = 3/4 of note is filled */
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#define NORMAL 7 /* 7/8ths of note interval is filled */
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#define LEGATO 8 /* all of note interval is filled */
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#define DFLT_OCTAVE 4 /* default octave */
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#define MIN_TEMPO 32 /* minimum tempo */
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#define DFLT_TEMPO 120 /* default tempo */
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#define MAX_TEMPO 255 /* max tempo */
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#define NUM_MULT 3 /* numerator of dot multiplier */
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#define DENOM_MULT 2 /* denominator of dot multiplier */
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/* letter to half-tone: A B C D E F G */
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static int notetab[8] = {9, 11, 0, 2, 4, 5, 7};
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/*
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* This is the American Standard A440 Equal-Tempered scale with frequencies
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* rounded to nearest integer. Thank Goddess for the good ol' CRC Handbook...
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* our octave 0 is standard octave 2.
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*/
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#define OCTAVE_NOTES 12 /* semitones per octave */
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static int pitchtab[] =
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{
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/* C C# D D# E F F# G G# A A# B*/
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/* 0 */ 65, 69, 73, 78, 82, 87, 93, 98, 103, 110, 117, 123,
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/* 1 */ 131, 139, 147, 156, 165, 175, 185, 196, 208, 220, 233, 247,
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/* 2 */ 262, 277, 294, 311, 330, 349, 370, 392, 415, 440, 466, 494,
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/* 3 */ 523, 554, 587, 622, 659, 698, 740, 784, 831, 880, 932, 988,
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/* 4 */ 1047, 1109, 1175, 1245, 1319, 1397, 1480, 1568, 1661, 1760, 1865, 1975,
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/* 5 */ 2093, 2217, 2349, 2489, 2637, 2794, 2960, 3136, 3322, 3520, 3729, 3951,
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/* 6 */ 4186, 4435, 4698, 4978, 5274, 5588, 5920, 6272, 6644, 7040, 7459, 7902,
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};
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static void
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playinit(void)
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{
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octave = DFLT_OCTAVE;
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whole = (100 * SECS_PER_MIN * WHOLE_NOTE) / DFLT_TEMPO;
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fill = NORMAL;
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value = DFLT_VALUE;
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octtrack = FALSE;
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octprefix = TRUE; /* act as though there was an initial O(n) */
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}
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/*
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* Play tone of proper duration for current rhythm signature
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*/
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static void
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playtone(int pitch, int value, int sustain)
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{
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int sound, silence, snum = 1, sdenom = 1;
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/* this weirdness avoids floating-point arithmetic */
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for (; sustain; sustain--) {
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/* See the BUGS section in the man page for discussion */
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snum *= NUM_MULT;
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sdenom *= DENOM_MULT;
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}
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if (value == 0 || sdenom == 0)
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return;
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if (pitch == -1)
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rest(whole * snum / (value * sdenom));
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else {
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sound = (whole * snum) / (value * sdenom)
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- (whole * (FILLTIME - fill)) / (value * FILLTIME);
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silence = whole * (FILLTIME-fill) * snum / (FILLTIME * value * sdenom);
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#ifdef DEBUG
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(void) printf("playtone: pitch %d for %d ticks, rest for %d ticks\n",
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pitch, sound, silence);
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#endif /* DEBUG */
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tone(pitchtab[pitch], sound);
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if (fill != LEGATO)
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rest(silence);
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}
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}
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/*
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* Interpret and play an item from a notation string
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*/
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static void
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playstring(char *cp, size_t slen)
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{
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int pitch, oldfill, lastpitch = OCTAVE_NOTES * DFLT_OCTAVE;
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#define GETNUM(cp, v) for(v=0; isdigit(cp[1]) && slen > 0; ) \
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{v = v * 10 + (*++cp - '0'); slen--;}
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for (; slen--; cp++) {
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int sustain, timeval, tempo;
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char c = toupper(*cp);
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#ifdef DEBUG
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(void) printf("playstring: %c (%x)\n", c, c);
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#endif /* DEBUG */
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switch (c) {
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case 'A':
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case 'B':
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case 'C':
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case 'D':
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case 'E':
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case 'F':
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case 'G':
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/* compute pitch */
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pitch = notetab[c - 'A'] + octave * OCTAVE_NOTES;
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/* this may be followed by an accidental sign */
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if (cp[1] == '#' || cp[1] == '+') {
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++pitch;
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++cp;
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slen--;
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} else if (cp[1] == '-') {
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--pitch;
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++cp;
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slen--;
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}
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/*
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* If octave-tracking mode is on, and there has been no octave-
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* setting prefix, find the version of the current letter note
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* closest to the last regardless of octave.
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*/
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if (octtrack && !octprefix) {
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if (abs(pitch-lastpitch) > abs(pitch+OCTAVE_NOTES -
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lastpitch)) {
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++octave;
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pitch += OCTAVE_NOTES;
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}
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if (abs(pitch-lastpitch) > abs((pitch-OCTAVE_NOTES) -
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lastpitch)) {
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--octave;
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pitch -= OCTAVE_NOTES;
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}
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}
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octprefix = FALSE;
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lastpitch = pitch;
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/* ...which may in turn be followed by an override time value */
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GETNUM(cp, timeval);
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if (timeval <= 0 || timeval > MIN_VALUE)
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timeval = value;
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/* ...and/or sustain dots */
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for (sustain = 0; cp[1] == '.'; cp++) {
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slen--;
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sustain++;
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}
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/* ...and/or a slur mark */
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oldfill = fill;
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if (cp[1] == '_') {
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fill = LEGATO;
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++cp;
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slen--;
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}
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/* time to emit the actual tone */
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playtone(pitch, timeval, sustain);
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fill = oldfill;
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break;
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case 'O':
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if (cp[1] == 'N' || cp[1] == 'n') {
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octprefix = octtrack = FALSE;
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++cp;
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slen--;
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} else if (cp[1] == 'L' || cp[1] == 'l') {
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octtrack = TRUE;
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++cp;
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slen--;
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} else {
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GETNUM(cp, octave);
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if (octave >= nitems(pitchtab) / OCTAVE_NOTES)
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octave = DFLT_OCTAVE;
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octprefix = TRUE;
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}
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break;
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case '>':
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if (octave < nitems(pitchtab) / OCTAVE_NOTES - 1)
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octave++;
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octprefix = TRUE;
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break;
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case '<':
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if (octave > 0)
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octave--;
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octprefix = TRUE;
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break;
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case 'N':
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GETNUM(cp, pitch);
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for (sustain = 0; cp[1] == '.'; cp++) {
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slen--;
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sustain++;
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}
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oldfill = fill;
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if (cp[1] == '_') {
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fill = LEGATO;
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++cp;
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slen--;
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}
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playtone(pitch - 1, value, sustain);
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fill = oldfill;
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break;
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case 'L':
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GETNUM(cp, value);
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if (value <= 0 || value > MIN_VALUE)
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value = DFLT_VALUE;
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break;
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case 'P':
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case '~':
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/* this may be followed by an override time value */
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GETNUM(cp, timeval);
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if (timeval <= 0 || timeval > MIN_VALUE)
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timeval = value;
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for (sustain = 0; cp[1] == '.'; cp++) {
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slen--;
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sustain++;
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}
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playtone(-1, timeval, sustain);
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break;
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case 'T':
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GETNUM(cp, tempo);
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if (tempo < MIN_TEMPO || tempo > MAX_TEMPO)
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tempo = DFLT_TEMPO;
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whole = (100 * SECS_PER_MIN * WHOLE_NOTE) / tempo;
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break;
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case 'M':
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if (cp[1] == 'N' || cp[1] == 'n') {
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fill = NORMAL;
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++cp;
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slen--;
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} else if (cp[1] == 'L' || cp[1] == 'l') {
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fill = LEGATO;
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++cp;
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slen--;
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} else if (cp[1] == 'S' || cp[1] == 's') {
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fill = STACCATO;
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++cp;
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slen--;
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}
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break;
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}
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}
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}
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/*
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* ****************** UNIX DRIVER HOOKS BEGIN HERE **************************
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* This section implements driver hooks to run playstring() and the tone(),
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* endtone(), and rest() functions defined above.
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*/
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static int spkr_active = FALSE; /* exclusion flag */
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static char *spkr_inbuf; /* incoming buf */
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static int
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spkropen(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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#ifdef DEBUG
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(void) printf("spkropen: entering with dev = %s\n", devtoname(dev));
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#endif /* DEBUG */
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if (spkr_active)
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return(EBUSY);
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else {
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#ifdef DEBUG
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(void) printf("spkropen: about to perform play initialization\n");
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#endif /* DEBUG */
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playinit();
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spkr_inbuf = malloc(DEV_BSIZE, M_SPKR, M_WAITOK);
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spkr_active = TRUE;
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return(0);
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}
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}
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static int
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spkrwrite(struct cdev *dev, struct uio *uio, int ioflag)
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{
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#ifdef DEBUG
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printf("spkrwrite: entering with dev = %s, count = %zd\n",
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devtoname(dev), uio->uio_resid);
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#endif /* DEBUG */
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if (uio->uio_resid > (DEV_BSIZE - 1)) /* prevent system crashes */
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return(E2BIG);
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else {
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unsigned n;
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char *cp;
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int error;
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n = uio->uio_resid;
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cp = spkr_inbuf;
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error = uiomove(cp, n, uio);
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if (!error) {
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cp[n] = '\0';
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playstring(cp, n);
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}
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return(error);
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}
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}
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static int
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spkrclose(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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#ifdef DEBUG
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(void) printf("spkrclose: entering with dev = %s\n", devtoname(dev));
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#endif /* DEBUG */
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wakeup(&endtone);
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wakeup(&endrest);
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free(spkr_inbuf, M_SPKR);
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spkr_active = FALSE;
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return(0);
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}
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static int
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spkrioctl(struct cdev *dev, unsigned long cmd, caddr_t cmdarg, int flags,
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struct thread *td)
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{
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#ifdef DEBUG
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(void) printf("spkrioctl: entering with dev = %s, cmd = %lx\n",
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devtoname(dev), cmd);
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#endif /* DEBUG */
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if (cmd == SPKRTONE) {
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tone_t *tp = (tone_t *)cmdarg;
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if (tp->frequency == 0)
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rest(tp->duration);
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else
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tone(tp->frequency, tp->duration);
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return 0;
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} else if (cmd == SPKRTUNE) {
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tone_t *tp = (tone_t *)(*(caddr_t *)cmdarg);
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tone_t ttp;
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int error;
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for (; ; tp++) {
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error = copyin(tp, &ttp, sizeof(tone_t));
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if (error)
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return(error);
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if (ttp.duration == 0)
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break;
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if (ttp.frequency == 0)
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rest(ttp.duration);
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else
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tone(ttp.frequency, ttp.duration);
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}
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return(0);
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}
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return(EINVAL);
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}
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static struct cdev *speaker_dev;
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/*
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* Module handling
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*/
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static int
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speaker_modevent(module_t mod, int type, void *data)
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{
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int error = 0;
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switch(type) {
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case MOD_LOAD:
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speaker_dev = make_dev(&spkr_cdevsw, 0,
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UID_ROOT, GID_WHEEL, 0600, "speaker");
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break;
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case MOD_SHUTDOWN:
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case MOD_UNLOAD:
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destroy_dev(speaker_dev);
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break;
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default:
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error = EOPNOTSUPP;
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}
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return (error);
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}
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DEV_MODULE(speaker, speaker_modevent, NULL);
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