ref: 41e27b2d10c6a60c49931332e8677438736a1e36
dir: /os/js/devcs4231.c/
/*
* preliminary Crystal CS4231 audio driver,
* initially based on SB16 driver, and therefore needs work.
* for instance, i suspect the linked-list buffering is excessive:
* a rolling buffering scheme or double buffering should be fine,
* and possibly simpler.
*
* To do:
* stop/start?
* is the linux mix_cvt ideal?
* ad1845 differences
* adpcm freezing
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include "devtab.h"
#include "io.h"
#include "audio.h"
#define DPRINT if(chatty)print
typedef struct AChan AChan;
typedef struct AQueue AQueue;
typedef struct Buf Buf;
typedef struct Vol Vol;
enum
{
Qdir = 0,
Qaudio,
Qaudioctl,
Fmono = 1,
Fin = 2,
Fout = 4,
Vaudio = 0,
Vaux1,
Vaux2,
Vline,
Vmic,
Vmono,
Vspeed,
Vchans,
Vbits,
Nvol,
Speed = 22050,
Ncmd = 50, /* max volume command words */
};
enum {
Paddr= 0,
TRD= 1<<5,
MCE= 1<<6,
Pdata= 1,
Pstatus= 2,
Pio= 3,
LeftADC= 0,
MGE= 1<<5,
ISline= 0<<6,
ISaux1= 1<<6,
ISmic= 2<<6,
ISloop= 3<<6,
ISmask= 3<<6,
RightADC= 1,
LeftAux1= 2,
Mute= 1<<7,
RightAux1= 3,
LeftAux2= 4,
RightAux2= 5,
LeftDAC= 6,
RightDAC= 7,
OutFormat= 8,
Stereo= 1<<4,
Linear8= 0<<5,
uLaw= 1<<5,
Linear16= 2<<5,
aLaw= 3<<5,
ADPCM= 5<<5,
Fmask= 7<<5,
Config= 9,
PEN= 1<<0,
CEN= 1<<1,
Nocal= 0<<3,
Convcal= 1<<3,
DACcal= 2<<3,
Fullcal= 3<<3,
PinControl= 10,
IEN= 1<<1,
DEN= 1<<3,
Xctl0= 1<<6,
Xctl1= 1<<7,
Status= 11,
ACI= 1<<5,
Mode= 12,
Mode2= 1<<6,
Loopback= 13,
LBE= 1<<0,
PlayCount1= 14,
PlayCount0= 15,
Feature1= 16,
PMCE= 1<<4,
CMCE= 1<<5,
Feature2= 17,
LeftLine= 18,
RightLine= 19,
Timer0= 20,
Timer1= 21,
Feature3= 23,
FeatureStatus= 24,
PI= 1<<4, /* playback interrupt */
CI= 1<<5, /* capture interrupt */
TI= 1<<6, /* timer interrupt */
ChipID= 25,
MonoCtl= 26,
MBY= 1<<5, /* mono bypass */
MOM= 1<<6,
InFormat= 28,
RecCount1= 30,
RecCount0= 31,
};
#define csdelay() microdelay(1)
static Dirtab audiodir[] =
{
"audio", {Qaudio}, 0, 0666,
"audioctl", {Qaudioctl}, 0, 0666,
};
#define NPORT (sizeof audiodir/sizeof(Dirtab))
struct Buf
{
uchar* virt;
int count;
Buf* next;
};
struct AQueue
{
Lock;
Buf* first;
Buf* last;
};
struct AChan
{
QLock;
Rendez r;
Buf buf[Nbuf]; /* buffers and queues */
AQueue empty;
AQueue full;
Buf* current;
Buf* filling;
int flushing;
};
static struct
{
QLock;
int opened;
int bufinit; /* boolean if buffers allocated */
int rivol[Nvol]; /* right/left input/output volumes */
int livol[Nvol];
int rovol[Nvol];
int lovol[Nvol];
int loopback;
AChan in;
AChan out;
} audio;
static char* encname(int);
static int dacload(int, int);
static int auxload(int, int);
static int adcload(int, int);
static int monoload(int, int);
struct Vol
{
char* name;
int flag;
int ilval; /* initial values */
int irval;
int reg;
int (*load)(int, int);
};
static Vol volumes[] = {
[Vaudio] {"audio", Fout, 50, 50, LeftDAC, dacload},
[Vaux1] {"aux1", Fin, 0, 0, LeftAux1, auxload},
[Vaux2] {"aux2", Fin, 0, 0, LeftAux2, auxload},
[Vline] {"line", Fin, 0, 0, LeftLine, auxload},
[Vmono] {"mono", Fin|Fout|Fmono, 0, 0, MonoCtl, monoload},
[Vmic] {"mic", Fin, 0, 0, LeftADC, adcload},
[Vspeed] {"rate", Fin|Fout|Fmono, Speed, Speed,},
[Vchans] {"chans", Fin|Fout|Fmono, 2, 2,},
[Vbits] {"bits", Fin|Fout|Fmono, 8, 8,},
{0},
};
static struct
{
Lock;
int port;
int irq;
uchar sticky;
uchar regs[32];
} csdev;
static void contininput(void);
static void continoutput(void);
static char Evolume[] = "illegal audioctl specifier";
static int chatty;
#include "cs4231.h"
static int
xin(int r)
{
int i;
for(i=100; --i >= 0 && IN(Paddr) & 0x80;)
csdelay();
OUT(Paddr, r|csdev.sticky);
csdelay();
return IN(Pdata);
}
static void
xout(int r, int v)
{
int i;
for(i=100; --i >= 0 && IN(Paddr) & 0x80;)
csdelay();
OUT(Paddr, r|csdev.sticky);
csdelay();
OUT(Pdata, v);
//csdelay();
}
static void
speaker(int on)
{
int s;
s = xin(PinControl);
if(on)
s |= Xctl0;
else
s &= ~Xctl0;
xout(PinControl, s);
}
static Buf*
getbuf(AQueue *q)
{
Buf *b;
ilock(q);
b = q->first;
if(b)
q->first = b->next;
iunlock(q);
return b;
}
static void
putbuf(AQueue *q, Buf *b)
{
ilock(q);
b->next = 0;
if(q->first)
q->last->next = b;
else
q->first = b;
q->last = b;
iunlock(q);
}
static void
achanreset(AChan *ac)
{
int i;
ac->filling = 0;
ac->flushing = 0;
ac->current = 0;
ac->empty.first = 0;
ac->empty.last = 0;
ac->full.first = 0;
ac->full.last = 0;
for(i=0; i<Nbuf; i++){
ac->buf[i].count = 0;
putbuf(&ac->empty, &ac->buf[i]);
}
}
static void
startoutput(void)
{
ilock(&csdev);
if(audio.out.current == 0)
continoutput();
iunlock(&csdev);
}
static void
continoutput(void)
{
Buf *b;
int f;
ulong n;
b = getbuf(&audio.out.full);
audio.out.current = b;
//xout(Config, xin(Config)&~PEN);
if(b){
n = b->count;
dmasetup(Wdma, b->virt, n, 0);
f = xin(OutFormat);
if((f & Fmask) == ADPCM)
n >>= 2;
else{
if((f & Fmask) == Linear16)
n >>= 1;
if(f & Stereo)
n >>= 1;
}
n--;
xout(PlayCount0, n);
xout(PlayCount1, n>>8);
xout(Config, xin(Config)|PEN);
DPRINT("cs: out %d\n", n);
} else
xout(Config, xin(Config)&~PEN);
}
static void
startinput(void)
{
ilock(&csdev);
if(audio.in.current == 0)
contininput();
iunlock(&csdev);
}
static void
contininput(void)
{
Buf *b;
int f;
ulong n;
xout(Config, xin(Config)&~CEN);
if(!audio.opened || audio.in.flushing){
return;
}
b = getbuf(&audio.in.empty);
audio.in.current = b;
if(b){
n = Bufsize;
dmasetup(Rdma, b->virt, Bufsize, 1);
f = xin(InFormat);
if((f & Fmask) == ADPCM)
n >>= 2;
else{
if((f & Fmask) == Linear16)
n >>= 1;
if(f & Stereo)
n >>= 1;
}
n--;
xout(RecCount0, n);
xout(RecCount1, n>>8);
xout(Config, xin(Config)|CEN);
DPRINT("cs: in %d\n", n);
}
}
static void
cswait(void)
{
int i;
for(i=50; --i >= 0 && IN(Paddr) & 0x80;)
microdelay(2000);
if(i < 0)
print("cswait1\n");
for(i=1000; --i >= 0 && (xin(Status) & ACI) == 0;)
csdelay();
for(i=1000; --i >= 0 && xin(Status) & ACI;)
microdelay(2000);
/* could give error(Eio) if i < 0 */
if(i < 0)
print("cswait2\n");
}
static int
csspeed(int freq)
{
int i;
static int freqtab[] = { /* p. 33 CFS2-CFS0 */
/* xtal1 xtal2 */
8000, 5510,
16000, 11025,
27420, 18900,
32000, 22050,
0, 37800,
0, 44100,
48000, 33075,
9600, 6620,
};
for(i=0; i<16; i++)
if(freqtab[i] == freq){
xout(OutFormat, (xin(OutFormat)&~0xF) | i);
return 1;
}
return 0;
}
static void
csformat(int r, int flag, int form, int *vec)
{
int v;
if(form == Linear8){
if(vec[Vbits] == 16)
form = Linear16;
else if(vec[Vbits] == 4)
form = ADPCM;
}
if(vec[Vchans] == 2)
form |= Stereo;
DPRINT("csformat(%x,%x,%x)\n", r, flag, form);
if((xin(r)&0xF0) != form){
v = xin(Feature1);
xout(Feature1, v|flag);
xout(r, (xin(r)&~0xF0)|form);
xout(Feature1, v);
}
csdev.regs[r] = form;
}
static void
cs4231intr(Ureg*, void*)
{
int ir, s;
Buf *b;
lock(&csdev);
csdev.sticky |= TRD;
ir = IN(Pstatus);
s = xin(FeatureStatus);
if(s & PI){
b = audio.out.current;
audio.out.current = 0;
dmaend(Wdma);
continoutput();
if(b)
putbuf(&audio.out.empty, b);
wakeup(&audio.out.r);
}
if(s & CI){
b = audio.in.current;
audio.in.current = 0;
dmaend(Rdma);
contininput();
if(b){
b->count = Bufsize;
putbuf(&audio.in.full, b);
}
wakeup(&audio.in.r);
}
OUT(Pstatus, 0);
csdev.sticky &= ~TRD;
unlock(&csdev);
if(s & 0xF)
DPRINT("audiointr: #%x\n", s);
}
static int
anybuf(void *p)
{
return ((AChan*)p)->empty.first != 0;
}
static int
anyinput(void *p)
{
return ((AChan*)p)->full.first != 0;
}
static int
outcomplete(void *p)
{
return ((AChan*)p)->full.first == 0 && ((AChan*)p)->current==0;
}
static int
incomplete(void *p)
{
return ((AChan*)p)->current == 0;
}
static void
acbufinit(AChan *ac)
{
int i;
void *p;
for(i=0; i<Nbuf; i++) {
//p = xspanalloc(Bufsize, CACHELINESZ, 64*1024);
//dcflush(p, Bufsize);
p = xalloc(Bufsize);
ac->buf[i].virt = UNCACHED(uchar, p);
}
}
static void
setempty(void)
{
ilock(&csdev);
achanreset(&audio.in);
achanreset(&audio.out);
iunlock(&csdev);
}
void
cs4231reset(void)
{
}
static char mix_cvt[101] = {
0, 0,3,7,10,13,16,19,21,23,26,28,30,32,34,35,37,39,40,42,
43,45,46,47,49,50,51,52,53,55,56,57,58,59,60,61,62,63,64,65,
65,66,67,68,69,70,70,71,72,73,73,74,75,75,76,77,77,78,79,79,
80,81,81,82,82,83,84,84,85,85,86,86,87,87,88,88,89,89,90,90,
91,91,92,92,93,93,94,94,95,95,96,96,96,97,97,98,98,98,99,99,
100
};
static int
dacload(int r, int v)
{
USED(r);
DPRINT("dacload(%x,%d)\n", r, v);
if(v == 0)
return Mute;
return 63-((v*63)/100);
}
static int
monoload(int r, int v)
{
DPRINT("monoload(%x,%d)\n", r, v);
if(v == 0)
return r|Mute;
return (r&~(Mute|MBY))|(15-((v*15)/100));
}
static int
auxload(int r, int v)
{
DPRINT("auxload(%x,%d)\n", r, v);
USED(r);
if(v == 0)
return Mute;
return 31-(v*31)/100;
}
static int
adcload(int r, int v)
{
DPRINT("adcload(%x,%d)\n", r, v);
return (r&~0xF)|((v*15)/100)|MGE;
}
static void
mxvolume(void)
{
Vol *v;
int i, l, r;
ilock(&csdev);
speaker(0);
for(i =0; volumes[i].name; i++){
v = &volumes[i];
if(v->load == 0)
continue;
if(v->flag & Fin){
l = audio.livol[i];
r = audio.rivol[i];
} else {
l = audio.lovol[i];
r = audio.rovol[i];
}
if(l < 0)
l = 0;
if(r < 0)
r = 0;
if(l > 100)
l = 100;
if(r > 100)
r = 100;
l = mix_cvt[l];
r = mix_cvt[r];
if((v->flag & Fmono) == 0){
xout(v->reg, (*v->load)(xin(v->reg), l));
xout(v->reg+1, (*v->load)(xin(v->reg+1), r));
} else
xout(v->reg, (*v->load)(xin(v->reg), l));
}
xout(LeftADC, (xin(LeftADC)&~ISmask)|csdev.regs[LeftADC]);
xout(RightADC, (xin(RightADC)&~ISmask)|csdev.regs[RightADC]);
if(audio.loopback)
xout(Loopback, xin(Loopback)|LBE);
else
xout(Loopback, xin(Loopback)&~LBE);
csformat(InFormat, CMCE, csdev.regs[InFormat], audio.livol);
csformat(OutFormat, PMCE, csdev.regs[OutFormat], audio.lovol);
if(audio.lovol[Vaudio] || audio.rovol[Vaudio])
speaker(1);
iunlock(&csdev);
}
static void
flushinput(void)
{
Buf *b;
ilock(&csdev);
audio.in.flushing = 1;
iunlock(&csdev);
qlock(&audio.in);
if(waserror()){
qunlock(&audio.in);
nexterror();
}
sleep(&audio.in.r, incomplete, &audio.in);
qunlock(&audio.in);
poperror();
ilock(&csdev);
audio.in.flushing = 0;
iunlock(&csdev);
if((b = audio.in.filling) != 0){
audio.in.filling = 0;
putbuf(&audio.in.empty, b);
}
while((b = getbuf(&audio.in.full)) != 0)
putbuf(&audio.in.empty, b);
}
static void
waitoutput(void)
{
qlock(&audio.out);
if(waserror()){
qunlock(&audio.out);
nexterror();
}
startoutput();
while(!outcomplete(&audio.out))
sleep(&audio.out.r, outcomplete, &audio.out);
qunlock(&audio.out);
poperror();
}
static void
resetlevel(void)
{
int i;
for(i=0; volumes[i].name; i++) {
audio.lovol[i] = volumes[i].ilval;
audio.rovol[i] = volumes[i].irval;
audio.livol[i] = volumes[i].ilval;
audio.rivol[i] = volumes[i].irval;
}
}
void
cs4231init(void)
{
cs4231install();
csdev.regs[LeftADC] = ISmic;
csdev.regs[RightADC] = ISmic;
dmasize(Wdma, 8);
dmasize(Rdma, 8);
csdev.sticky = 0;
OUT(Paddr, Mode);
csdelay();
if((IN(Pdata) & 0x8F) != 0x8a){
DPRINT("port %x not cs4231a: %x\n", IN(Pdata));
return;
}
print("audio0: cs4231a: port %x irq %d wdma %d rdma %d\n", csdev.port, csdev.irq, Wdma, Rdma);
resetlevel();
cswait();
OUT(Paddr, Mode);
csdelay();
OUT(Pdata, Mode2|IN(Pdata)); /* mode2 for all the trimmings */
csdelay();
cswait();
csdev.sticky = MCE;
xout(Config, Fullcal);
csspeed(volumes[Vspeed].ilval);
csformat(InFormat, CMCE, Linear8, audio.livol);
csformat(OutFormat, PMCE, Linear8, audio.lovol);
csdev.sticky &= ~MCE;
OUT(Paddr, csdev.sticky);
microdelay(10000);
cswait(); /* recalibration takes ages */
xout(FeatureStatus, 0);
OUT(Pstatus, 0);
setvec(csdev.irq, cs4231intr, 0);
xout(PinControl, xin(PinControl)|IEN);
}
Chan*
cs4231attach(char *param)
{
return devattach('A', param);
}
Chan*
cs4231clone(Chan *c, Chan *nc)
{
return devclone(c, nc);
}
int
cs4231walk(Chan *c, char *name)
{
return devwalk(c, name, audiodir, NPORT, devgen);
}
void
cs4231stat(Chan *c, char *db)
{
devstat(c, db, audiodir, NPORT, devgen);
}
Chan*
cs4231open(Chan *c, int omode)
{
switch(c->qid.path & ~CHDIR) {
default:
error(Eperm);
break;
case Qaudioctl:
case Qdir:
break;
case Qaudio:
qlock(&audio);
if(audio.opened){
qunlock(&audio);
error(Einuse);
}
if(audio.bufinit == 0) {
audio.bufinit = 1;
acbufinit(&audio.in);
acbufinit(&audio.out);
}
audio.opened = 1;
setempty();
qunlock(&audio);
mxvolume();
break;
}
c = devopen(c, omode, audiodir, NPORT, devgen);
c->mode = openmode(omode);
c->flag |= COPEN;
c->offset = 0;
return c;
}
void
cs4231create(Chan *c, char *name, int omode, ulong perm)
{
USED(c, name, omode, perm);
error(Eperm);
}
void
cs4231close(Chan *c)
{
Buf *b;
switch(c->qid.path & ~CHDIR) {
default:
error(Eperm);
break;
case Qdir:
case Qaudioctl:
break;
case Qaudio:
if(c->flag & COPEN) {
qlock(&audio);
audio.opened = 0;
if(waserror()){
qunlock(&audio);
nexterror();
}
b = audio.out.filling;
if(b){
audio.out.filling = 0;
putbuf(&audio.out.full, b);
}
waitoutput();
flushinput();
//tsleep(&up->sleep, return0, 0, 500);
//speaker(0);
qunlock(&audio);
poperror();
}
break;
}
}
long
cs4231read(Chan *c, char *a, long n, vlong offset)
{
int liv, riv, lov, rov, ifmt, ofmt;
long m, n0;
char buf[350];
Buf *b;
int j;
n0 = n;
switch(c->qid.path & ~CHDIR) {
default:
error(Eperm);
break;
case Qdir:
return devdirread(c, a, n, audiodir, NPORT, devgen);
case Qaudio:
qlock(&audio.in);
if(waserror()){
qunlock(&audio.in);
nexterror();
}
while(n > 0) {
b = audio.in.filling;
if(b == 0) {
b = getbuf(&audio.in.full);
if(b == 0) {
startinput();
sleep(&audio.in.r, anyinput, &audio.in);
continue;
}
audio.in.filling = b;
b->count = 0;
}
m = Bufsize-b->count;
if(m > n)
m = n;
memmove(a, b->virt+b->count, m);
b->count += m;
n -= m;
a += m;
if(b->count >= Bufsize) {
audio.in.filling = 0;
putbuf(&audio.in.empty, b);
}
}
qunlock(&audio.in);
poperror();
break;
case Qaudioctl:
j = 0;
buf[0] = 0;
for(m=0; volumes[m].name; m++){
liv = audio.livol[m];
riv = audio.rivol[m];
lov = audio.lovol[m];
rov = audio.rovol[m];
j += snprint(buf+j, sizeof(buf)-j, "%s", volumes[m].name);
if((volumes[m].flag & Fmono) || liv==riv && lov==rov){
if((volumes[m].flag&(Fin|Fout))==(Fin|Fout) && liv==lov)
j += snprint(buf+j, sizeof(buf)-j, " %d", liv);
else{
if(volumes[m].flag & Fin)
j += snprint(buf+j, sizeof(buf)-j, " in %d", liv);
if(volumes[m].flag & Fout)
j += snprint(buf+j, sizeof(buf)-j, " out %d", lov);
}
}else{
if((volumes[m].flag&(Fin|Fout))==(Fin|Fout) && liv==lov && riv==rov)
j += snprint(buf+j, sizeof(buf)-j, " left %d right %d",
liv, riv);
else{
if(volumes[m].flag & Fin)
j += snprint(buf+j, sizeof(buf)-j, " in left %d right %d",
liv, riv);
if(volumes[m].flag & Fout)
j += snprint(buf+j, sizeof(buf)-j, " out left %d right %d",
lov, rov);
}
}
j += snprint(buf+j, sizeof(buf)-j, "\n");
}
ifmt = xin(InFormat);
ofmt = xin(OutFormat);
if(ifmt != ofmt){
j += snprint(buf+j, sizeof(buf)-j, "in enc %s\n", encname(ifmt));
j += snprint(buf+j, sizeof(buf)-j, "out enc %s\n", encname(ofmt));
} else
j += snprint(buf+j, sizeof(buf)-j, "enc %s\n", encname(ifmt));
j += snprint(buf+j, sizeof(buf)-j, "loop %d\n", audio.loopback);
{int i; for(i=0; i<32; i++){j += snprint(buf+j, sizeof(buf)-j, " %d:%x", i, xin(i)); }j += snprint(buf+j,sizeof(buf)-j,"\n");}
USED(j);
return readstr(offset, a, n, buf);
}
return n0-n;
}
Block*
cs4231bread(Chan *c, long n, ulong offset)
{
return devbread(c, n, offset);
}
long
cs4231write(Chan *c, char *a, long n, vlong offset)
{
long m, n0;
int i, nf, v, left, right, in, out, fmt, doload;
char buf[255], *field[Ncmd];
Buf *b;
USED(offset);
n0 = n;
switch(c->qid.path & ~CHDIR) {
default:
error(Eperm);
break;
case Qaudioctl:
waitoutput();
flushinput();
qlock(&audio);
if(waserror()){
qunlock(&audio);
nexterror();
}
v = Vaudio;
doload = 0;
left = 1;
right = 1;
in = 1;
out = 1;
if(n > sizeof(buf)-1)
n = sizeof(buf)-1;
memmove(buf, a, n);
buf[n] = '\0';
nf = getfields(buf, field, Ncmd, 1, " \t\n,");
for(i = 0; i < nf; i++){
/*
* a number is volume
*/
if(field[i][0] >= '0' && field[i][0] <= '9') {
m = strtoul(field[i], 0, 10);
if(left && out)
audio.lovol[v] = m;
if(left && in)
audio.livol[v] = m;
if(right && out)
audio.rovol[v] = m;
if(right && in)
audio.rivol[v] = m;
if(v == Vspeed){
ilock(&csdev);
csdev.sticky = MCE;
csspeed(m);
csdev.sticky &= ~MCE;
OUT(Paddr, csdev.sticky);
microdelay(10000);
cswait();
iunlock(&csdev);
} else
doload = 1;
continue;
}
for(m=0; volumes[m].name; m++) {
if(strcmp(field[i], volumes[m].name) == 0) {
v = m;
in = 1;
out = 1;
left = 1;
right = 1;
break;
}
}
if(volumes[m].name)
continue;
if(strcmp(field[i], "chat") == 0){
chatty = !chatty;
continue;
}
if(strcmp(field[i], "reset") == 0) {
resetlevel();
doload = 1;
continue;
}
if(strcmp(field[i], "loop") == 0) {
if(++i >= nf)
error(Evolume);
audio.loopback = strtoul(field[i], 0, 10);
doload = 1;
continue;
}
if(strcmp(field[i], "enc") == 0) {
if(++i >= nf)
error(Evolume);
fmt = -1;
if(strcmp(field[i], "ulaw") == 0)
fmt = uLaw;
else if(strcmp(field[i], "alaw") == 0)
fmt = aLaw;
else if(strcmp(field[i], "pcm") == 0)
fmt = Linear8;
else if(strcmp(field[i], "adpcm") == 0)
fmt = ADPCM;
else
error(Evolume);
if(in)
csdev.regs[InFormat] = fmt;
if(out)
csdev.regs[OutFormat] = fmt;
doload = 1;
continue;
}
if(strcmp(field[i], "dev") == 0) {
if(++i >= nf)
error(Evolume);
if(in){
fmt = -1;
if(strcmp(field[i], "mic") == 0)
fmt = ISmic;
else if(strcmp(field[i], "line") == 0)
fmt = ISline;
else if(strcmp(field[i], "aux1") == 0)
fmt = ISaux1;
else if(strcmp(field[i], "loop") == 0)
fmt = ISloop;
else
error(Evolume);
if(left)
csdev.regs[LeftADC] = fmt;
if(right)
csdev.regs[RightADC] = fmt;
doload = 1;
}
continue;
}
if(strcmp(field[i], "in") == 0) {
in = 1;
out = 0;
continue;
}
if(strcmp(field[i], "out") == 0) {
in = 0;
out = 1;
continue;
}
if(strcmp(field[i], "left") == 0) {
left = 1;
right = 0;
continue;
}
if(strcmp(field[i], "right") == 0) {
left = 0;
right = 1;
continue;
}
error(Evolume);
}
if(doload)
mxvolume();
qunlock(&audio);
poperror();
n=0;
break;
case Qaudio:
qlock(&audio.out);
if(waserror()){
qunlock(&audio.out);
nexterror();
}
while(n > 0) {
b = audio.out.filling;
if(b == 0) {
b = getbuf(&audio.out.empty);
if(b == 0) {
startoutput();
sleep(&audio.out.r, anybuf, &audio.out);
continue;
}
b->count = 0;
audio.out.filling = b;
}
m = Bufsize-b->count;
if(m > n)
m = n;
memmove(b->virt+b->count, a, m);
b->count += m;
n -= m;
a += m;
if(b->count >= Bufsize) {
audio.out.filling = 0;
putbuf(&audio.out.full, b);
}
}
qunlock(&audio.out);
poperror();
break;
}
return n0 - n;
}
long
cs4231bwrite(Chan *c, Block *bp, ulong offset)
{
return devbwrite(c, bp, offset);
}
void
cs4231remove(Chan *c)
{
USED(c);
error(Eperm);
}
void
cs4231wstat(Chan *c, char *dp)
{
USED(c, dp);
error(Eperm);
}
static char *
encname(int v)
{
switch(v & ~(0xF|Stereo)){
case uLaw: return "ulaw";
case aLaw: return "alaw";
case Linear8: return "pcm";
case Linear16: return "pcm16";
case ADPCM: return "adpcm";
default: return "?";
}
}