404 lines
9.3 KiB
C
404 lines
9.3 KiB
C
/*-
|
|
* Copyright (c) 1994 Søren Schmidt
|
|
* 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. The name of the author may not be used to endorse or promote products
|
|
* derived from this software withough 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.
|
|
*
|
|
* $Id$
|
|
*/
|
|
|
|
#include "param.h"
|
|
#include "uio.h"
|
|
#include "ioctl.h"
|
|
#include "sound/ulaw.h"
|
|
#include "machine/cpufunc.h"
|
|
#include "machine/pio.h"
|
|
#include "machine/pcaudioio.h"
|
|
#include "i386/isa/isa.h"
|
|
#include "i386/isa/isa_device.h"
|
|
#include "i386/isa/timerreg.h"
|
|
|
|
#include "pca.h"
|
|
#if NPCA > 0
|
|
|
|
#define BUF_SIZE 8192
|
|
#define SAMPLE_RATE 8000
|
|
#define INTERRUPT_RATE 16000
|
|
|
|
static struct pca_status {
|
|
char open; /* device open */
|
|
char queries; /* did others try opening */
|
|
unsigned char *buf[2]; /* double buffering */
|
|
unsigned char *buffer; /* current buffer ptr */
|
|
unsigned in_use[2]; /* buffers fill */
|
|
unsigned index; /* index in current buffer */
|
|
unsigned counter; /* sample counter */
|
|
unsigned scale; /* sample counter scale */
|
|
unsigned sample_rate; /* sample rate */
|
|
unsigned processed; /* samples processed */
|
|
unsigned volume; /* volume for pc-speaker */
|
|
char encoding; /* Ulaw, Alaw or linear */
|
|
char current; /* current buffer */
|
|
unsigned char oldval; /* old timer port value */
|
|
char timer_on; /* is playback running */
|
|
} pca_status;
|
|
|
|
static char buffer1[BUF_SIZE];
|
|
static char buffer2[BUF_SIZE];
|
|
static char volume_table[256];
|
|
|
|
static int pca_sleep = 0;
|
|
static int pca_initialized = 0;
|
|
|
|
void pcaintr(int regs);
|
|
int pcaprobe(struct isa_device *dvp);
|
|
int pcaattach(struct isa_device *dvp);
|
|
int pcaclose(dev_t dev, int flag);
|
|
int pcaopen(dev_t dev, int flag);
|
|
int pcawrite(dev_t dev, struct uio *uio, int flag);
|
|
int pcaioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p);
|
|
|
|
struct isa_driver pcadriver = {
|
|
pcaprobe, pcaattach, "pca",
|
|
};
|
|
|
|
|
|
inline void conv(const void *table, void *buff, unsigned long n)
|
|
{
|
|
__asm__("1:\tmovb (%2), %3\n"
|
|
"\txlatb\n"
|
|
"\tmovb %3, (%2)\n"
|
|
"\tinc %2\n"
|
|
"\tdec %1\n"
|
|
"\tjnz 1b\n"
|
|
:
|
|
:"b" ((long)table), "c" (n), "D" ((long)buff), "a" ((char)n)
|
|
:"bx","cx","di","ax");
|
|
}
|
|
|
|
|
|
static void
|
|
pca_volume(int volume)
|
|
{
|
|
int i, j;
|
|
|
|
for (i=0; i<256; i++) {
|
|
j = ((i-128)*volume)/100;
|
|
if (j<-128)
|
|
j = -128;
|
|
if (j>127)
|
|
j = 127;
|
|
volume_table[i] = (((255-(j + 128))/4)+1);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
pca_init()
|
|
{
|
|
pca_status.open = 0;
|
|
pca_status.queries = 0;
|
|
pca_status.timer_on = 0;
|
|
pca_status.buf[0] = (unsigned char *)&buffer1[0];
|
|
pca_status.buf[1] = (unsigned char *)&buffer2[0];
|
|
pca_status.buffer = pca_status.buf[0];
|
|
pca_status.in_use[0] = pca_status.in_use[1] = 0;
|
|
pca_status.current = 0;
|
|
pca_status.sample_rate = SAMPLE_RATE;
|
|
pca_status.scale = (pca_status.sample_rate << 8) / INTERRUPT_RATE;
|
|
pca_status.encoding = AUDIO_ENCODING_ULAW;
|
|
pca_status.volume = 100;
|
|
|
|
pca_volume(pca_status.volume);
|
|
}
|
|
|
|
|
|
static int
|
|
pca_start(void)
|
|
{
|
|
/* use the first buffer */
|
|
pca_status.current = 0;
|
|
pca_status.index = 0;
|
|
pca_status.counter = 0;
|
|
pca_status.buffer = pca_status.buf[pca_status.current];
|
|
pca_status.oldval = inb(IO_PPI) | 0x03;
|
|
/* acquire the timers */
|
|
if (acquire_timer2(TIMER_LSB|TIMER_ONESHOT)) {
|
|
return -1;
|
|
}
|
|
if (acquire_timer0(INTERRUPT_RATE, pcaintr)) {
|
|
release_timer2();
|
|
return -1;
|
|
}
|
|
pca_status.timer_on = 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void
|
|
pca_stop(void)
|
|
{
|
|
/* release the timers */
|
|
release_timer0();
|
|
release_timer2();
|
|
/* reset the buffer */
|
|
pca_status.in_use[0] = pca_status.in_use[1] = 0;
|
|
pca_status.index = 0;
|
|
pca_status.counter = 0;
|
|
pca_status.current = 0;
|
|
pca_status.buffer = pca_status.buf[pca_status.current];
|
|
pca_status.timer_on = 0;
|
|
}
|
|
|
|
|
|
static void
|
|
pca_pause()
|
|
{
|
|
release_timer0();
|
|
release_timer2();
|
|
pca_status.timer_on = 0;
|
|
}
|
|
|
|
|
|
static void
|
|
pca_continue()
|
|
{
|
|
pca_status.oldval = inb(IO_PPI) | 0x03;
|
|
acquire_timer2(TIMER_LSB|TIMER_ONESHOT);
|
|
acquire_timer0(INTERRUPT_RATE, pcaintr);
|
|
pca_status.timer_on = 1;
|
|
}
|
|
|
|
|
|
static void
|
|
pca_wait(void)
|
|
{
|
|
while (pca_status.in_use[0] || pca_status.in_use[1]) {
|
|
pca_sleep = 1;
|
|
tsleep((caddr_t)&pca_sleep, PZERO|PCATCH, "pca_drain", 0);
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
pcaprobe(struct isa_device *dvp)
|
|
{
|
|
return(-1);
|
|
}
|
|
|
|
|
|
int
|
|
pcaattach(struct isa_device *dvp)
|
|
{
|
|
printf(" PCM audio driver\n", dvp->id_unit);
|
|
pca_init();
|
|
return 1;
|
|
}
|
|
|
|
|
|
int
|
|
pcaopen(dev_t dev, int flag)
|
|
{
|
|
/* audioctl device can always be opened */
|
|
if (minor(dev) == 128)
|
|
return 0;
|
|
if (minor(dev) > 0)
|
|
return ENXIO;
|
|
|
|
if (!pca_initialized) {
|
|
pca_init();
|
|
pca_initialized = 1;
|
|
}
|
|
|
|
/* audio device can only be open by one process */
|
|
if (pca_status.open) {
|
|
pca_status.queries = 1;
|
|
return EBUSY;
|
|
}
|
|
pca_status.buffer = pca_status.buf[0];
|
|
pca_status.in_use[0] = pca_status.in_use[1] = 0;
|
|
pca_status.timer_on = 0;
|
|
pca_status.open = 1;
|
|
pca_status.processed = 0;
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
pcaclose(dev_t dev, int flag)
|
|
{
|
|
/* audioctl device can always be closed */
|
|
if (minor(dev) == 128)
|
|
return 0;
|
|
if (minor(dev) > 0)
|
|
return ENXIO;
|
|
/* audio device close drains all output and restores timers */
|
|
pca_wait();
|
|
pca_stop();
|
|
pca_status.open = 0;
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
pcawrite(dev_t dev, struct uio *uio, int flag)
|
|
{
|
|
int count, which;
|
|
|
|
/* only audio device can be written */
|
|
if (minor(dev) > 0)
|
|
return ENXIO;
|
|
|
|
while ((count = min(BUF_SIZE, uio->uio_resid)) > 0) {
|
|
which = pca_status.in_use[0] ? 1 : 0;
|
|
if (count && !pca_status.in_use[which]) {
|
|
uiomove(pca_status.buf[which], count, uio);
|
|
pca_status.processed += count;
|
|
switch (pca_status.encoding) {
|
|
case AUDIO_ENCODING_ULAW:
|
|
conv(ulaw_dsp, pca_status.buf[which], count);
|
|
break;
|
|
|
|
case AUDIO_ENCODING_ALAW:
|
|
break;
|
|
|
|
case AUDIO_ENCODING_RAW:
|
|
break;
|
|
}
|
|
pca_status.in_use[which] = count;
|
|
if (!pca_status.timer_on)
|
|
if (pca_start())
|
|
return EBUSY;
|
|
}
|
|
if (pca_status.in_use[0] && pca_status.in_use[1]) {
|
|
pca_sleep = 1;
|
|
tsleep((caddr_t)&pca_sleep, PZERO|PCATCH, "pca_wait",0);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
pcaioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
|
|
{
|
|
audio_info_t *auptr;
|
|
|
|
switch(cmd) {
|
|
|
|
case AUDIO_GETINFO:
|
|
auptr = (audio_info_t *)data;
|
|
auptr->play.sample_rate = pca_status.sample_rate;
|
|
auptr->play.channels = 1;
|
|
auptr->play.precision = 8;
|
|
auptr->play.encoding = pca_status.encoding;
|
|
|
|
auptr->play.gain = pca_status.volume;
|
|
auptr->play.port = 0;
|
|
|
|
auptr->play.samples = pca_status.processed;
|
|
auptr->play.eof = 0;
|
|
auptr->play.pause = !pca_status.timer_on;
|
|
auptr->play.error = 0;
|
|
auptr->play.waiting = pca_status.queries;
|
|
|
|
auptr->play.open = pca_status.open;
|
|
auptr->play.active = pca_status.timer_on;
|
|
return 0;
|
|
|
|
case AUDIO_SETINFO:
|
|
auptr = (audio_info_t *)data;
|
|
if (auptr->play.sample_rate != (unsigned int)~0) {
|
|
pca_status.sample_rate = auptr->play.sample_rate;
|
|
pca_status.scale =
|
|
(pca_status.sample_rate << 8) / INTERRUPT_RATE;
|
|
}
|
|
if (auptr->play.encoding != (unsigned int)~0) {
|
|
pca_status.encoding = auptr->play.encoding;
|
|
}
|
|
if (auptr->play.gain != (unsigned int)~0) {
|
|
pca_status.volume = auptr->play.gain;
|
|
pca_volume(pca_status.volume);
|
|
}
|
|
if (auptr->play.pause != (unsigned char)~0) {
|
|
if (auptr->play.pause)
|
|
pca_pause();
|
|
else
|
|
pca_continue();
|
|
}
|
|
|
|
return 0;
|
|
|
|
case AUDIO_DRAIN:
|
|
pca_wait();
|
|
return 0;
|
|
|
|
case AUDIO_FLUSH:
|
|
pca_stop();
|
|
return 0;
|
|
|
|
}
|
|
return ENXIO;
|
|
}
|
|
|
|
|
|
void
|
|
pcaintr(int regs)
|
|
{
|
|
if (pca_status.index < pca_status.in_use[pca_status.current]) {
|
|
#if 1
|
|
disable_intr();
|
|
__asm__("outb %0,$0x61\n"
|
|
"andb $0xFE,%0\n"
|
|
"outb %0,$0x61"
|
|
: : "a" ((char)pca_status.oldval) );
|
|
__asm__("xlatb\n"
|
|
"outb %0,$0x42"
|
|
: : "a" ((char)pca_status.buffer[pca_status.index]),
|
|
"b" ((long)volume_table) );
|
|
enable_intr();
|
|
#else
|
|
disable_intr();
|
|
outb(IO_PPI, pca_status.oldval);
|
|
outb(IO_PPI, pca_status.oldval & 0xFE);
|
|
outb(TIMER_CNTR2,
|
|
volume_table[pca_status.buffer[pca_status.index]]);
|
|
enable_intr();
|
|
#endif
|
|
pca_status.counter += pca_status.scale;
|
|
pca_status.index = (pca_status.counter >> 8);
|
|
}
|
|
else {
|
|
pca_status.index = pca_status.counter = 0;
|
|
pca_status.in_use[pca_status.current] = 0;
|
|
pca_status.current ^= 1;
|
|
pca_status.buffer = pca_status.buf[pca_status.current];
|
|
if (pca_sleep) {
|
|
wakeup((caddr_t)&pca_sleep);
|
|
pca_sleep = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|