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aux/imx8pm: add relative brightness setting (-+N), useful for key bindings

--- a/sys/man/8/imx8pm

+++ b/sys/man/8/imx8pm

@@ -14,6 +14,11 @@

 .B -s

 .I service

 ]

+.nf

+.sp 0.3v

+.B /mnt/pm/cputemp

+.B /mnt/pm/ctl

+.fi

 .SH DESCRIPTION

 .I Aux/imx8pm

 presents at

@@ -26,13 +31,22 @@

 .BI /srv/ service 

 as well.

 .PP

-The directory contains the following files.

-.TP

 .B cputemp

 Exposes the current temperature reading of the CPU.

-.TP

+.PP

 .B ctl

-Provides a way to control the brightness of the built-in LCD.

+Provides a way to control the brightness of the built-in LCD by

+writing

+.IP

+.I brightness [-+]N

+.PP

+.B N

+is expressed in percentage, either as an absolute value (0-100) or

+relative to the current brightness - by prefixing with a sign.

+.PP

+Reading

+.B ctl

+returns the current brightness.

 .SH SOURCE

 .B /sys/src/cmd/aux/imx8pm.c

 .SH SEE ALSO

--- a/sys/src/cmd/aux/imx8pm.c

+++ b/sys/src/cmd/aux/imx8pm.c

@@ -174,7 +174,7 @@

 fswrite(Req *r)

 {

 	char msg[256], *f[4];

-	int nf;

+	int nf, v;

 	if(r->fid->file->aux == (void*)Ctl){

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

@@ -184,8 +184,12 @@

 			respond(r, "invalid ctl message");

 			return;

 		}

-		if(strcmp(f[0], "brightness") == 0)

-			setbrightness(atoi(f[1]));

+		if(strcmp(f[0], "brightness") == 0){

+			v = atoi(f[1]);

+			if(*f[1] == '+' || *f[1] == '-')

+				v += getbrightness();

+			setbrightness(v);

+		}

 	}

 	r->ofcall.count = r->ifcall.count;