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freebsd-dev/sys/i386/isa/pcaudio.c

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/*-
* Copyright (c) 1994-1998 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,
* without modification, immediately at the beginning of the file.
* 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 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/filio.h>
#include <sys/poll.h>
#include <sys/vnode.h>
#include <machine/clock.h>
#include <machine/pcaudioio.h>
#include <isa/isareg.h>
#include <isa/isavar.h>
#include <i386/isa/timerreg.h>
#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[3]; /* triple buffering */
unsigned char *buffer; /* current buffer ptr */
unsigned in_use[3]; /* 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 */
u_char current; /* current buffer */
unsigned char oldval; /* old timer port value */
char timer_on; /* is playback running */
struct selinfo wsel; /* select/poll status */
} pca_status;
static char buffer1[BUF_SIZE];
static char buffer2[BUF_SIZE];
static char buffer3[BUF_SIZE];
static char volume_table[256];
static unsigned char ulaw_dsp[] = {
3, 7, 11, 15, 19, 23, 27, 31,
35, 39, 43, 47, 51, 55, 59, 63,
66, 68, 70, 72, 74, 76, 78, 80,
82, 84, 86, 88, 90, 92, 94, 96,
98, 99, 100, 101, 102, 103, 104, 105,
106, 107, 108, 109, 110, 111, 112, 113,
113, 114, 114, 115, 115, 116, 116, 117,
117, 118, 118, 119, 119, 120, 120, 121,
121, 121, 122, 122, 122, 122, 123, 123,
123, 123, 124, 124, 124, 124, 125, 125,
125, 125, 125, 125, 126, 126, 126, 126,
126, 126, 126, 126, 127, 127, 127, 127,
127, 127, 127, 127, 127, 127, 127, 127,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
253, 249, 245, 241, 237, 233, 229, 225,
221, 217, 213, 209, 205, 201, 197, 193,
190, 188, 186, 184, 182, 180, 178, 176,
174, 172, 170, 168, 166, 164, 162, 160,
158, 157, 156, 155, 154, 153, 152, 151,
150, 149, 148, 147, 146, 145, 144, 143,
143, 142, 142, 141, 141, 140, 140, 139,
139, 138, 138, 137, 137, 136, 136, 135,
135, 135, 134, 134, 134, 134, 133, 133,
133, 133, 132, 132, 132, 132, 131, 131,
131, 131, 131, 131, 130, 130, 130, 130,
130, 130, 130, 130, 129, 129, 129, 129,
129, 129, 129, 129, 129, 129, 129, 129,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
};
static unsigned char alaw_linear[] = {
45, 214, 122, 133, 0, 255, 107, 149,
86, 171, 126, 129, 0, 255, 117, 138,
13, 246, 120, 135, 0, 255, 99, 157,
70, 187, 124, 131, 0, 255, 113, 142,
61, 198, 123, 132, 0, 255, 111, 145,
94, 163, 127, 128, 0, 255, 119, 136,
29, 230, 121, 134, 0, 255, 103, 153,
78, 179, 125, 130, 0, 255, 115, 140,
37, 222, 122, 133, 0, 255, 105, 151,
82, 175, 126, 129, 0, 255, 116, 139,
5, 254, 120, 135, 0, 255, 97, 159,
66, 191, 124, 131, 0, 255, 112, 143,
53, 206, 123, 132, 0, 255, 109, 147,
90, 167, 127, 128, 0, 255, 118, 137,
21, 238, 121, 134, 0, 255, 101, 155,
74, 183, 125, 130, 0, 255, 114, 141,
49, 210, 123, 133, 0, 255, 108, 148,
88, 169, 127, 129, 0, 255, 118, 138,
17, 242, 121, 135, 0, 255, 100, 156,
72, 185, 125, 131, 0, 255, 114, 142,
64, 194, 124, 132, 0, 255, 112, 144,
96, 161, 128, 128, 1, 255, 120, 136,
33, 226, 122, 134, 0, 255, 104, 152,
80, 177, 126, 130, 0, 255, 116, 140,
41, 218, 122, 133, 0, 255, 106, 150,
84, 173, 126, 129, 0, 255, 117, 139,
9, 250, 120, 135, 0, 255, 98, 158,
68, 189, 124, 131, 0, 255, 113, 143,
57, 202, 123, 132, 0, 255, 110, 146,
92, 165, 127, 128, 0, 255, 119, 137,
25, 234, 121, 134, 0, 255, 102, 154,
76, 181, 125, 130, 0, 255, 115, 141,
};
static int pca_sleep = 0;
static int pca_initialized = 0;
static void pcaintr(struct clockframe *frame);
static d_open_t pcaopen;
static d_close_t pcaclose;
static d_write_t pcawrite;
static d_ioctl_t pcaioctl;
static d_poll_t pcapoll;
#define CDEV_MAJOR 24
static struct cdevsw pca_cdevsw = {
/* open */ pcaopen,
/* close */ pcaclose,
/* read */ noread,
/* write */ pcawrite,
/* ioctl */ pcaioctl,
/* poll */ pcapoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "pca",
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
/* bmaj */ -1
};
static void pca_continue __P((void));
static void pca_init __P((void));
static void pca_pause __P((void));
static void
conv(const unsigned char *table, unsigned char *buff, unsigned n)
{
unsigned i;
for (i = 0; i < n; i++)
buff[i] = table[buff[i]];
}
static void
pca_volume(int volume)
{
int i, j;
for (i=0; i<256; i++) {
j = ((i-128)*volume)/25;
/* XXX
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(void)
{
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.buf[2] = (unsigned char *)&buffer3[0];
pca_status.buffer = pca_status.buf[0];
pca_status.in_use[0] = pca_status.in_use[1] = pca_status.in_use[2] = 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)
{
int x = splhigh();
int rv = 0;
/* 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))
rv = -1;
else if (acquire_timer0(INTERRUPT_RATE, pcaintr)) {
release_timer2();
rv = -1;
} else
pca_status.timer_on = 1;
splx(x);
return rv;
}
static void
pca_stop(void)
{
int x = splhigh();
/* release the timers */
release_timer0();
release_timer2();
/* reset the buffer */
pca_status.in_use[0] = pca_status.in_use[1] = pca_status.in_use[2] = 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;
splx(x);
}
static void
pca_pause(void)
{
int x = splhigh();
release_timer0();
release_timer2();
pca_status.timer_on = 0;
splx(x);
}
static void
pca_continue(void)
{
int x = splhigh();
pca_status.oldval = inb(IO_PPI) | 0x03;
acquire_timer2(TIMER_LSB|TIMER_ONESHOT);
acquire_timer0(INTERRUPT_RATE, pcaintr);
pca_status.timer_on = 1;
splx(x);
}
static int
pca_wait(void)
{
int error, x;
if (!pca_status.timer_on)
return 0;
while (pca_status.in_use[0] || pca_status.in_use[1] ||
pca_status.in_use[2]) {
x = spltty();
pca_sleep = 1;
error = tsleep(&pca_sleep, PZERO|PCATCH, "pca_drain", 0);
pca_sleep = 0;
splx(x);
if (error != 0 && error != ERESTART) {
pca_stop();
return error;
}
}
return 0;
}
static struct isa_pnp_id pca_ids[] = {
{0x0008d041, "AT-style speaker sound"}, /* PNP0800 */
{0}
};
static int
pcaprobe(device_t dev)
{
int error;
/* Check isapnp ids */
error = ISA_PNP_PROBE(device_get_parent(dev), dev, pca_ids);
if (error == ENXIO)
return ENXIO;
return 0;
}
static int
pcaattach(device_t dev)
{
pca_init();
make_dev(&pca_cdevsw, 0, 0, 0, 0600, "pcaudio");
make_dev(&pca_cdevsw, 128, 0, 0, 0600, "pcaudioctl");
return 0;
}
static device_method_t pca_methods[] = {
DEVMETHOD(device_probe, pcaprobe),
DEVMETHOD(device_attach, pcaattach),
{ 0, 0 }
};
static driver_t pca_driver = {
"pca",
pca_methods,
1
};
static devclass_t pca_devclass;
DRIVER_MODULE(pca, isa, pca_driver, pca_devclass, 0, 0);
static int
pcaopen(dev_t dev, int flags, int fmt, struct proc *p)
{
/* 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] = pca_status.in_use[2] = 0;
pca_status.timer_on = 0;
pca_status.open = 1;
pca_status.processed = 0;
return 0;
}
static int
pcaclose(dev_t dev, int flags, int fmt, struct proc *p)
{
/* 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;
}
static int
pcawrite(dev_t dev, struct uio *uio, int flag)
{
int count, error, which, x;
/* only audio device can be written */
if (minor(dev) > 0)
return ENXIO;
while ((count = min(BUF_SIZE, uio->uio_resid)) > 0) {
if (pca_status.in_use[0] && pca_status.in_use[1] &&
pca_status.in_use[2]) {
if (flag & IO_NDELAY)
return EWOULDBLOCK;
x = spltty();
pca_sleep = 1;
error = tsleep(&pca_sleep, PZERO|PCATCH, "pca_wait", 0);
pca_sleep = 0;
splx(x);
if (error != 0 && error != ERESTART) {
pca_stop();
return error;
}
}
if (!pca_status.in_use[0])
which = 0;
else if (!pca_status.in_use[1])
which = 1;
else
which = 2;
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:
conv(alaw_linear, pca_status.buf[which], count);
break;
case AUDIO_ENCODING_RAW:
break;
}
pca_status.in_use[which] = count;
if (!pca_status.timer_on)
if (pca_start())
return EBUSY;
}
}
return 0;
}
static int
pcaioctl(dev_t dev, u_long 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:
case AUDIO_COMPAT_DRAIN:
return pca_wait();
case AUDIO_FLUSH:
case AUDIO_COMPAT_FLUSH:
pca_stop();
return 0;
case FIONBIO:
return 0;
}
return ENXIO;
}
static void
pcaintr(struct clockframe *frame)
{
if (pca_status.index < pca_status.in_use[pca_status.current]) {
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" (volume_table) );
enable_intr();
pca_status.counter += pca_status.scale;
pca_status.index = (pca_status.counter >> 8);
}
if (pca_status.index >= pca_status.in_use[pca_status.current]) {
pca_status.index = pca_status.counter = 0;
pca_status.in_use[pca_status.current] = 0;
pca_status.current++;
if (pca_status.current > 2)
pca_status.current = 0;
pca_status.buffer = pca_status.buf[pca_status.current];
if (pca_sleep)
wakeup(&pca_sleep);
if (pca_status.wsel.si_pid) {
selwakeup((struct selinfo *)&pca_status.wsel.si_pid);
pca_status.wsel.si_pid = 0;
pca_status.wsel.si_flags = 0;
}
}
}
static int
pcapoll(dev_t dev, int events, struct proc *p)
{
int s;
int revents = 0;
s = spltty();
if (events & (POLLOUT | POLLWRNORM)) {
if (!pca_status.in_use[0] || !pca_status.in_use[1] ||
!pca_status.in_use[2])
revents |= events & (POLLOUT | POLLWRNORM);
else
selrecord(p, &pca_status.wsel);
}
splx(s);
return (revents);
}
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