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aux/wm8960: relative volume adjustment through the fs interface

--- a/sys/man/8/wm8960

+++ b/sys/man/8/wm8960

@@ -17,6 +17,11 @@

 .B -s

 .I service

 ]

+.nf

+.sp 0.3v

+.B /mnt/wm8960/audioctl

+.B /mnt/wm8960/volume

+.fi

 .SH DESCRIPTION

 .I Aux/imx8pm

 presents at

@@ -28,7 +33,7 @@

 .I service

 is specified, the interface will be posted at

 .BI /srv/ service 

-as well. In order to only initialize the DAC and immediately exit without

+as well. In order to initialize the DAC and immediately exit, without

 running a file system, option

 .I -1

 can be used.

@@ -57,7 +62,11 @@

 .BR reset .

 .TP

 .B volume

-Provides an interface for volume control (see \fIaudio\fR(3)). Only

+Provides an interface for volume control (see \fIaudio\fR(3)). For ease of use,

+.B volume

+supports relative adjustments by prefixing a number with a sign.

+.IP

+Only

 44100Hz (default) and 48000Hz sample rates are supported.

 .IP

 Enhanced stereo separation can be enabled by writing

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

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

@@ -240,6 +240,18 @@

 	respond(r, nil);

 }

+static int

+setoradd(int x, char *s)

+{

+	int d;

+

+	d = atoi(s);

+	if(*s == '+' || *s == '-')

+		return x + d;

+

+	return d;

+}

+

 static void

 fswrite(Req *r)

 {

@@ -287,8 +299,8 @@

 			goto Emsg;

 		toggle(o, on);

 	}else if(r->fid->file->aux == (void*)Vol){

-		vl = atoi(f[1]);

-		vr = nf < 3 ? vl : atoi(f[2]);

+		vl = setoradd(o->vol[0], f[1]);

+		vr = setoradd(o->vol[1], nf < 3 ? f[1] : f[2]);

 		setvol(o, vl, vr);

 	}