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#include <u.h>
#include <libc.h>
#include <fcall.h>
#include <thread.h>
#include <9p.h>
#define MIN(a,b) (a<b?a:b)
#define MAX(a,b) (a>b?a:b)
#define CLAMP(x,a,b) MAX(a,MIN(x,b))
typedef struct Out Out;
enum
{
Dac,
Spk,
Hp,
Nout,
Ctl = 1,
Vol,
};
struct Out
{
char *name;
int volreg;
int volmax;
void (*toggle)(Out *o, int on);
int on;
int vol[2];
};
static char *uid = "audio";
static int data;
static int reg1a = 1<<0; /* pll enable */
static void
wr(int a, int v)
{
u8int c;
//fprint(2, "[0x%x] ← 0x%ux\n", a, v & 0x1ff);
c = v & 0xff;
pwrite(data, &c, 1, a<<1 | ((v>>8)&1));
}
static void
dactoggle(Out *o, int on)
{
if(o->on = on)
reg1a |= 3<<7;
else
reg1a &= ~(3<<7);
wr(0x1a, reg1a);
}
static void
spktoggle(Out *o, int on)
{
if(o->on = on)
reg1a |= 3<<3;
else
reg1a &= ~(3<<3);
wr(0x31, (on ? 3 : 0)<<6); /* class D SPK out */
wr(0x1a, reg1a);
}
static void
hptoggle(Out *o, int on)
{
if(o->on = on)
reg1a |= 3<<5;
else
reg1a &= ~(3<<5);
wr(0x1a, reg1a);
}
static Out out[Nout] =
{
[Dac] = {"master", 0x0a, 0xff, dactoggle, 0},
[Spk] = {"spk", 0x28, 0x7f, spktoggle, 0},
[Hp] = {"hp", 0x02, 0x7f, hptoggle, 0},
};
static void
setvol(Out *o, int l, int r)
{
int zc;
o->vol[0] = l = CLAMP(l, 0, 100);
o->vol[1] = r = CLAMP(r, 0, 100);
if(l > 0)
l += o->volmax - 100;
if(r > 0)
r += o->volmax - 100;
zc = o->volmax < 0x80;
wr(o->volreg+0, 0<<8 | zc<<7 | l);
wr(o->volreg+1, 0<<8 | zc<<7 | r);
wr(o->volreg+1, 1<<8 | zc<<7 | r);
}
static void
reset(void)
{
u32int k;
Out *o;
int i;
wr(0x0f, 0); /* reset registers to default */
wr(0x04,
1<<0 | /* sysclk derived from pll */
2<<1 | /* sysclk div by 2 */
1<<3 | /* dacdiv = sysclk/(1.5*256) */
0
);
wr(0x34,
1<<5 | /* enable fractional mode */
1<<4 | /* pllprescale (divide mclk by 2 before) */
10<<0 | /* plln = int(f1/f2) */
0
);
k = 0x7654321; /* fractional part */
wr(0x35, k>>18);
wr(0x36, k>>9);
wr(0x37, k);
wr(0x05, 0<<3); /* unmute DAC */
wr(0x06, 1<<3 | 1<<2); /* ramp up DAC volume slowly */
wr(0x07, 1<<6 | 2); /* master mode; i²s, 16-bit words, slave mode */
wr(0x08, 5<<6 | 9<<0); /* class D divider: sysclk/8; bclk = sysclk/12 */
wr(0x19, 1<<7 | 1<<6); /* Vmid = playback, VREF on */
wr(0x22, 1<<8); /* L DAC to mixer */
wr(0x25, 1<<8); /* R DAC to mixer */
wr(0x2f, 3<<2); /* output mixer on */
wr(0x30, 1<<1); /* Tsense on */
wr(0x33, 5<<0); /* +5.1dB AC SPK boost - Reform's speakers can be too quiet */
/* sensible defaults */
setvol(&out[Dac], 100, 100);
setvol(&out[Spk], 80, 80);
setvol(&out[Hp], 65, 65);
/* enable every output and let the user decide later */
for(i = 0, o = out; i < Nout; i++, o++)
o->toggle(o, 1);
}
static void
fsread(Req *r)
{
char msg[256], *s, *e;
Out *o;
int i;
s = msg;
e = msg+sizeof(msg);
*s = 0;
if(r->fid->file->aux == (void*)Ctl){
for(i = 0, o = out; i < Nout; i++, o++)
s = seprint(s, e, "%s %s\n", o->name, o->on ? "on" : "off");
}else if(r->fid->file->aux == (void*)Vol){
for(i = 0, o = out; i < Nout; i++, o++)
s = seprint(s, e, "%s %d %d\n", o->name, o->vol[0], o->vol[1]);
seprint(s, e, "speed 44100\n");
}
readstr(r, msg);
respond(r, nil);
}
static void
fswrite(Req *r)
{
int nf, on, i, vl, vr;
char msg[256], *f[4];
Out *o;
snprint(msg, sizeof(msg), "%.*s",
utfnlen((char*)r->ifcall.data, r->ifcall.count), (char*)r->ifcall.data);
if((nf = tokenize(msg, f, nelem(f))) < 2){
if(nf == 1 && strcmp(f[0], "reset") == 0){
reset();
goto Done;
}
Emsg:
respond(r, "invalid ctl message");
return;
}
for(i = 0, o = out; i < Nout && strcmp(f[0], o->name) != 0; i++, o++)
;
if(i >= Nout)
goto Emsg;
if(r->fid->file->aux == (void*)Ctl){
if(nf != 2)
goto Emsg;
if(strcmp(f[1], "on") == 0)
on = 1;
else if(strcmp(f[1], "off") == 0)
on = 0;
else if(strcmp(f[1], "toggle") == 0)
on = !o->on;
else
goto Emsg;
o->toggle(o, on);
}else if(r->fid->file->aux == (void*)Vol){
vl = atoi(f[1]);
vr = nf < 3 ? vl : atoi(f[2]);
setvol(o, vl, vr);
}
Done:
r->ofcall.count = r->ifcall.count;
respond(r, nil);
}
static Srv fs = {
.read = fsread,
.write = fswrite,
};
static void
usage(void)
{
fprint(2, "usage: aux/wm8960 [-1] [-D] [-m /mnt/pm] [-s service]\n");
exits("usage");
}
void
main(int argc, char **argv)
{
char *mtpt, *srv;
int ctl, oneshot;
mtpt = "/mnt/wm8960";
srv = nil;
oneshot = 0;
ARGBEGIN{
case '1':
oneshot = 1;
break;
case 'D':
chatty9p = 1;
break;
case 'm':
mtpt = EARGF(usage());
break;
case 's':
srv = EARGF(usage());
break;
default:
usage();
}ARGEND
if((data = open("#J/i2c3/i2c.1a.data", OWRITE)) < 0)
sysfatal("i2c data: %r");
if((ctl = open("#J/i2c3/i2c.1a.ctl", OWRITE)) < 0)
sysfatal("i2c ctl: %r");
fprint(ctl, "subaddress 1\n");
fprint(ctl, "size %d\n", 0x38<<1);
close(ctl);
reset();
if(oneshot)
exits(nil);
fs.tree = alloctree(uid, uid, DMDIR|0555, nil);
createfile(fs.tree->root, "audioctl", uid, 0666, (void*)Ctl);
createfile(fs.tree->root, "volume", uid, 0666, (void*)Vol);
postmountsrv(&fs, srv, mtpt, MREPL);
exits(nil);
}
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