File:  [DragonFly] / src / sys / dev / sound / isa / i386 / spkr / Attic / spkr.c
Revision 1.3: download - view: text, annotated - select for diffs
Mon Jun 23 17:55:39 2003 UTC (11 years, 6 months ago) by dillon
Branches: MAIN
CVS tags: PRE_MP, HEAD
proc->thread stage 2: MAJOR revamping of system calls, ucred, jail API,
and some work on the low level device interface (proc arg -> thread arg).
As -current did, I have removed p_cred and incorporated its functions
into p_ucred.  p_prison has also been moved into p_ucred and adjusted
accordingly.  The jail interface tests now uses ucreds rather then processes.

The syscall(p,uap) interface has been changed to just (uap).  This is inclusive
of the emulation code.  It makes little sense to pass a proc pointer around
which confuses the MP readability of the code, because most system call code
will only work with the current process anyway.  Note that eventually
*ALL* syscall emulation code will be moved to a kernel-protected userland
layer because it really makes no sense whatsoever to implement these
emulations in the kernel.

suser() now takes no arguments and only operates with the current process.
The process argument has been removed from suser_xxx() so it now just takes
a ucred and flags.

The sysctl interface was adjusted somewhat.

/*
 * 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>
 *
 * $FreeBSD: src/sys/i386/isa/spkr.c,v 1.45 2000/01/29 16:00:32 peter Exp $
 * $DragonFly: src/sys/dev/sound/isa/i386/spkr/spkr.c,v 1.3 2003/06/23 17:55:39 dillon Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/conf.h>
#include <sys/ctype.h>
#include <i386/isa/isa.h>
#include <i386/isa/timerreg.h>
#include <machine/clock.h>
#include <machine/speaker.h>

static	d_open_t	spkropen;
static	d_close_t	spkrclose;
static	d_write_t	spkrwrite;
static	d_ioctl_t	spkrioctl;

#define CDEV_MAJOR 26
static struct cdevsw spkr_cdevsw = {
	/* open */	spkropen,
	/* close */	spkrclose,
	/* read */	noread,
	/* write */	spkrwrite,
	/* ioctl */	spkrioctl,
	/* poll */	nopoll,
	/* mmap */	nommap,
	/* strategy */	nostrategy,
	/* name */	"spkr",
	/* maj */	CDEV_MAJOR,
	/* dump */	nodump,
	/* psize */	nopsize,
	/* flags */	0,
	/* bmaj */	-1
};

/**************** 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.
 */

/*
 * PPI control values.
 * XXX should be in a header and used in clock.c.
 */
#define PPI_SPKR	0x03	/* turn these PPI bits on to pass sound */

#define SPKRPRI PSOCK
static char endtone, endrest;

static void tone __P((unsigned int thz, unsigned int ticks));
static void rest __P((int ticks));
static void playinit __P((void));
static void playtone __P((int pitch, int value, int sustain));
static int abs __P((int n));
static void playstring __P((char *cp, size_t slen));

/* emit tone of frequency thz for given number of ticks */
static void
tone(thz, ticks)
	unsigned int thz, ticks;
{
    unsigned int divisor;
    int sps;

    if (thz <= 0)
	return;

    divisor = timer_freq / thz;

#ifdef DEBUG
    (void) printf("tone: thz=%d ticks=%d\n", thz, ticks);
#endif /* DEBUG */

    /* set timer to generate clicks at given frequency in Hertz */
    sps = splclock();

    if (acquire_timer2(TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT)) {
	/* enter list of waiting procs ??? */
	splx(sps);
	return;
    }
    splx(sps);
    disable_intr();
    outb(TIMER_CNTR2, (divisor & 0xff));	/* send lo byte */
    outb(TIMER_CNTR2, (divisor >> 8));	/* send hi byte */
    enable_intr();

    /* turn the speaker on */
    outb(IO_PPI, inb(IO_PPI) | PPI_SPKR);

    /*
     * Set timeout to endtone function, then give up the timeslice.
     * This is so other processes can execute while the tone is being
     * emitted.
     */
    if (ticks > 0)
	tsleep((caddr_t)&endtone, SPKRPRI | PCATCH, "spkrtn", ticks);
    outb(IO_PPI, inb(IO_PPI) & ~PPI_SPKR);
    sps = splclock();
    release_timer2();
    splx(sps);
}

/* rest for given number of ticks */
static void
rest(ticks)
	int	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 DEBUG
    (void) printf("rest: %d\n", ticks);
#endif /* DEBUG */
    if (ticks > 0)
	tsleep((caddr_t)&endrest, SPKRPRI | PCATCH, "spkrrs", ticks);
}

/**************** 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 = (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) */
}

/* play tone of proper duration for current rhythm signature */
static void
playtone(pitch, value, sustain)
	int	pitch, value, 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);
    }
}

static int
abs(n)
	int n;
{
    if (n < 0)
	return(-n);
    else
	return(n);
}

/* interpret and play an item from a notation string */
static void
playstring(cp, slen)
	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 = (hz * 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 struct buf *spkr_inbuf;  /* incoming buf */

int
spkropen(dev_t dev, int	flags, int fmt, struct thread *td)
{
#ifdef DEBUG
    (void) printf("spkropen: entering with dev = %s\n", devtoname(dev));
#endif /* DEBUG */

    if (minor(dev) != 0)
	return(ENXIO);
    else if (spkr_active)
	return(EBUSY);
    else
    {
#ifdef DEBUG
	(void) printf("spkropen: about to perform play initialization\n");
#endif /* DEBUG */
	playinit();
	spkr_inbuf = geteblk(DEV_BSIZE);
	spkr_active = TRUE;
	return(0);
    }
}

int
spkrwrite(dev, uio, ioflag)
	dev_t		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 (minor(dev) != 0)
	return(ENXIO);
    else 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->b_data;
	error = uiomove(cp, n, uio);
	if (!error) {
		cp[n] = '\0';
		playstring(cp, n);
	}
	return(error);
    }
}

int
spkrclose(dev_t	dev, int flags, int fmt, struct thread *td)
{
#ifdef DEBUG
    (void) printf("spkrclose: entering with dev = %s\n", devtoname(dev));
#endif /* DEBUG */

    if (minor(dev) != 0)
	return(ENXIO);
    else
    {
	wakeup((caddr_t)&endtone);
	wakeup((caddr_t)&endrest);
	brelse(spkr_inbuf);
	spkr_active = FALSE;
	return(0);
    }
}

int
spkrioctl(dev_t	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 (minor(dev) != 0)
	return(ENXIO);
    else 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 void
spkr_drvinit(void *unused)
{
	make_dev(&spkr_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "speaker");
}

SYSINIT(spkrdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,spkr_drvinit,NULL)


/* spkr.c ends here */