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aux/wm8960: expose 3d stereo controls

--- a/sys/src/cmd/aux/wm8960.c

+++ b/sys/src/cmd/aux/wm8960.c

@@ -36,6 +36,7 @@

 static int data;

 static int reg1a;

 static int rate = 44100;

+static int ⅓d;

 static void

 wr(int a, int v)

@@ -92,6 +93,14 @@

 	wr(o->volreg+1, 1<<8 | zc<<7 | r);

 }

+static void

+set3d(int x)

+{

+	⅓d = CLAMP(x, 0, 100);

+	x = (⅓d+5)/7;

+	wr(0x10, x<<1 | (x ? 1 : 0)<<0);

+}

+

 static int

 setrate(int s)

 {

@@ -159,6 +168,7 @@

 	wr(0x0f, 0); /* reset registers to default */

 	setrate(rate);

+	set3d(⅓d);

 	wr(0x07, 1<<6 | 2); /* master mode; i²s, 16-bit words */

@@ -209,8 +219,9 @@

 	}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 %d\n", rate);

+		s = seprint(s, e, "speed %d\n", rate);

 	}

+	seprint(s, e, "3d %d\n", ⅓d);

 	readstr(r, msg);

 	respond(r, nil);

@@ -226,21 +237,23 @@

 	snprint(msg, sizeof(msg), "%.*s",

 		utfnlen((char*)r->ifcall.data, r->ifcall.count), (char*)r->ifcall.data);

 	nf = tokenize(msg, f, nelem(f));

-	if(nf < 2){

-		if(nf == 1 && strcmp(f[0], "reset") == 0){

-			reset();

-			goto Done;

-		}

-Emsg:

-		respond(r, "invalid ctl message");

-		return;

-	}

-	if(nf == 2 && strcmp(f[0], "speed") == 0){

+	if(nf == 1 && strcmp(f[0], "reset") == 0){

+		reset();

+		goto Done;

+	}else if(nf == 2 && strcmp(f[0], "speed") == 0){

 		if(setrate(atoi(f[1])) != 0){

 			respond(r, "not supported");

 			return;

 		}

 		goto Done;

+	}else if(nf == 2 && strcmp(f[0], "3d") == 0){

+		set3d(atoi(f[1]));

+		goto Done;

+	}

+	if(nf < 2){

+Emsg:

+		respond(r, "invalid ctl message");

+		return;

 	}

 	for(i = 0, o = out; i < Nout && strcmp(f[0], o->name) != 0; i++, o++)