Re: [9fans] Re: random moving of cursor arrow

[Enache Adrian <enache@rdslink.ro>]

A question about mouse support:

Have the new changes to the serial ports & mice code added support for scroll
serial mice (aka microsoft intellimice with 5 buttons) and for shift-button3
button2 emulation ?

I'm using a rather old 4th edition plan9 (Tue Sep  3 00:36:58 2002),
and there I hacked some code in the kernel so it works fine for me now
(but no code for pnp identification in aux/mouse.c - that would be simple,
though).

It looks like this:
src/9/port/devmouse.c:
/*
 * microsoft intellimouse 3 buttons + scroll
 * 	byte 0 -	1  L  R Y7 Y6 X7 X6
 *	byte 1 -	0 X5 X4 X3 X2 X1 X0
 *	byte 2 -	0 Y5 Y4 Y3 Y2 Y1 Y0
 *	byte 3 -	0  0  M  %  %  %  %
 *
 *	%: 0xf => U , 0x1 => D
 *
 *	L: left
 *	R: right
 *	U: up
 *	D: down
 */

int
m5mouseputc(Queue*, int c)
{
	static uchar msg[3];
	static int nb;
	msg[nb++] = c & 0x7f;
	if (nb == 4) {
		schar dx,dy,newbuttons;
		dx = msg[1] | (msg[0] & 0x3) << 6;
		dy = msg[2] | (msg[0] & 0xc) << 4;
		newbuttons =
			(msg[0] & 0x10) >> (shiftpressed ? 3:2)
			| (msg[0] & 0x20) >> 5
			| ( msg[3] == 0x10 ? 0x02 :
			    msg[3] == 0x0f ? 0x08 :
			    msg[3] == 0x01 ? 0x10 : 0 );
		mousetrack(dx, dy, newbuttons, TK2MS(MACHP(0)->ticks));
		nb = 0;
	}
	return 0;
}

(I also changed 'shift' in i8042intr() to 'shiftpressed' and made it global,
 and removed 'mouseshifted' which was never set).

Thanks & Regards,
Adi