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kbd: add "repeat" file to set typematic repeat rate/delay on PS/2 keyboards

--- a/sys/man/3/kbd

+++ b/sys/man/3/kbd

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

 .B /dev/scancode

 .B /dev/leds

+.B /dev/repeat

 .fi

 .SH DESCRIPTION

 .PP

@@ -13,9 +14,10 @@

 The

 .I kbd

 device serves a one-level directory containing the files

-.BR scancode

+.BR scancode ,

+.BR leds

 and

-.BR leds .

+.BR repeat .

 .PP

 Reading the

 .BR scancode

@@ -29,13 +31,26 @@

 .PP

 Writing a number to the write-only 

 .BR leds

-file changes the status leds on the keyboard. the value of the

+file changes the status leds on the keyboard. The value of the

 number is the addition of 1, 2 and 4 representing activated

 Scroll, Num and Caps leds.

+.PP

+The

+.BR repeat

+file sets typematic rate and delay.  The value of the number is a

+bitmask where first 5 bits set the repeat rate (ranging from 0b00000

+for 30Hz to 0b11111 for 2Hz).  Bits 6 and 7 set the delay before the

+first repeat is activated (ranging from 0b00 for 250Hz to 0b11 for

+1000Hz).

 .SH EXAMPLE 

 Set the Scroll and Caps leds:

 .EX

 echo 5 >/dev/leds

+.EE

+.PP

+Enable fast repeat rate and the least delay:

+.EX

+echo 0 >/dev/repeat

 .EE

 .SH "SEE ALSO"

 .IR kbdfs (8)

--- a/sys/src/9/pc/devkbd.c

+++ b/sys/src/9/pc/devkbd.c

@@ -40,6 +40,7 @@

 	Qdir,

 	Qscancode,

 	Qleds,

+	Qrepeat,

 };

 static Dirtab kbdtab[] = {

@@ -46,6 +47,7 @@

 	".",		{Qdir, 0, QTDIR},	0,	0555,

 	"scancode",	{Qscancode, 0},		0,	0440,

 	"leds",		{Qleds, 0},		0,	0220,

+	"repeat",	{Qrepeat, 0},		0,	0220,

 };

 static Lock i8042lock;

@@ -193,6 +195,28 @@

 	iunlock(&i8042lock);

 }

+static void

+setrepeat(int repeat)

+{

+	if(nokbd)

+		return;

+

+	repeat &= 0x7f;

+	ilock(&i8042lock);

+	for(;;){

+		if(outready() < 0)

+			break;

+		outb(Data, 0xf3);		/* `set typematic rate and delay' */

+		if(outready() < 0)

+			break;

+		outb(Data, repeat);

+		if(outready() < 0)

+			break;

+		break;

+	}

+	iunlock(&i8042lock);

+}

+

 /*

  *  keyboard interrupt

  */

@@ -357,9 +381,6 @@

 {

 	char tmp[8+1], *p;

-	if(c->qid.path != Qleds)

-		error(Egreg);

-

 	p = tmp + n;

 	if(n >= sizeof(tmp))

 		p = tmp + sizeof(tmp)-1;

@@ -366,7 +387,12 @@

 	memmove(tmp, a, p - tmp);

 	*p = 0;

-	setleds(atoi(tmp));

+	if(c->qid.path == Qleds)

+		setleds(atoi(tmp));

+	else if(c->qid.path == Qrepeat)

+		setrepeat(atoi(tmp));

+	else

+		error(Egreg);

 	return n;

 }