/*-
* 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.
*
* $Id: pcaudio.c,v 1.44 1998/12/13 23:32:44 eivind Exp $
*/
#include "pca.h"
#if NPCA > 0
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/filio.h>
#include <sys/poll.h>
#include <sys/vnode.h>
#include <machine/clock.h>
#include <machine/pcaudioio.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/timerreg.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /* DEVFS */
#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 */
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];
#define DSP_ULAW_NOT_WANTED
#include <i386/isa/snd/ulaw.h>
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,
};
#ifdef DEVFS
static void *pca_devfs_token;
static void *pcac_devfs_token;
#endif
static int pca_sleep = 0;
static int pca_initialized = 0;
static void pcaintr(struct clockframe *frame);
static int pcaprobe(struct isa_device *dvp);
static int pcaattach(struct isa_device *dvp);
struct isa_driver pcadriver = {
pcaprobe, pcaattach, "pca",
};
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 =
{ pcaopen, pcaclose, noread, pcawrite, /*24*/
pcaioctl, nostop, nullreset, nodevtotty,/* pcaudio */
pcapoll, nommap, NULL, "pca", NULL, -1 };
static void pca_continue __P((void));
static void pca_init __P((void));
static void pca_pause __P((void));
static __inline void
conv(const void *table, void *buff, unsigned int n)
{
__asm__("1:\tmovb (%2), %3\n"
"\txlatb\n"
"\tmovb %3, (%2)\n"
"\tinc %2\n"
"\tdec %1\n"
"\tjnz 1b\n"
:
:"b" (table), "c" (n), "D" (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)/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 int
pcaprobe(struct isa_device *dvp)
{
return(-1);
}
static int
pcaattach(struct isa_device *dvp)
{
printf("pca%d: PC speaker audio driver\n", dvp->id_unit);
pca_init();
#ifdef DEVFS
pca_devfs_token =
devfs_add_devswf(&pca_cdevsw, 0, DV_CHR, 0, 0, 0600, "pcaudio");
pcac_devfs_token =
devfs_add_devswf(&pca_cdevsw, 128, DV_CHR, 0, 0, 0600,
"pcaudioctl");
#endif /*DEVFS*/
return 1;
}
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;
struct proc *p1;
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 {
if (pca_status.wsel.si_pid &&
(p1=pfind(pca_status.wsel.si_pid))
&& p1->p_wchan == (caddr_t)&selwait)
pca_status.wsel.si_flags = SI_COLL;
else
pca_status.wsel.si_pid = p->p_pid;
}
splx(s);
return (revents);
}
static pca_devsw_installed = 0;
static void pca_drvinit(void *unused)
{
dev_t dev;
if( ! pca_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev,&pca_cdevsw, NULL);
pca_devsw_installed = 1;
}
}
SYSINIT(pcadev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,pca_drvinit,NULL)
#endif
