/*	$NetBSD: ms.c,v 1.28 2003/09/21 19:16:57 jdolecek Exp $	*/

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ms.c	8.1 (Berkeley) 6/11/93
 */

/*
 * Mouse driver (/dev/mouse)
 */

/*
 * Zilog Z8530 Dual UART driver (mouse interface)
 *
 * This is the "slave" driver that will be attached to
 * the "zsc" driver for a Sun mouse.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ms.c,v 1.28 2003/09/21 19:16:57 jdolecek Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/time.h>
#include <sys/syslog.h>
#include <sys/select.h>
#include <sys/poll.h>

#include <machine/vuid_event.h>

#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>
#include <dev/sun/event_var.h>
#include <dev/sun/msvar.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsmousevar.h>

#include "locators.h"
#include "wsmouse.h"

extern struct cfdriver ms_cd;

dev_type_open(msopen);
dev_type_close(msclose);
dev_type_read(msread);
dev_type_ioctl(msioctl);
dev_type_poll(mspoll);
dev_type_kqfilter(mskqfilter);

const struct cdevsw ms_cdevsw = {
	msopen, msclose, msread, nowrite, msioctl,
	nostop, notty, mspoll, nommap, mskqfilter,
};

/****************************************************************
 *  Entry points for /dev/mouse
 *  (open,close,read,write,...)
 ****************************************************************/

int
msopen(dev, flags, mode, p)
	dev_t dev;
	int flags, mode;
	struct proc *p;
{
	struct ms_softc *ms;
	int unit;

	unit = minor(dev);
	if (unit >= ms_cd.cd_ndevs)
		return (ENXIO);
	ms = ms_cd.cd_devs[unit];
	if (ms == NULL)
		return (ENXIO);

	/* This is an exclusive open device. */
	if (ms->ms_events.ev_io)
		return (EBUSY);

	if (ms->ms_deviopen) {
		int err;
		err = (*ms->ms_deviopen)((struct device *)ms, flags);
		if (err) 
			return (err);
	}
	ms->ms_events.ev_io = p;
	ev_init(&ms->ms_events);	/* may cause sleep */

	ms->ms_ready = 1;		/* start accepting events */
	return (0);
}

int
msclose(dev, flags, mode, p)
	dev_t dev;
	int flags, mode;
	struct proc *p;
{
	struct ms_softc *ms;

	ms = ms_cd.cd_devs[minor(dev)];
	ms->ms_ready = 0;		/* stop accepting events */
	ev_fini(&ms->ms_events);

	ms->ms_events.ev_io = NULL;
	if (ms->ms_deviclose) {
		int err;
		err = (*ms->ms_deviclose)((struct device *)ms, flags);
		if (err) 
			return (err);
	}
	return (0);
}

int
msread(dev, uio, flags)
	dev_t dev;
	struct uio *uio;
	int flags;
{
	struct ms_softc *ms;

	ms = ms_cd.cd_devs[minor(dev)];
	return (ev_read(&ms->ms_events, uio, flags));
}

int
msioctl(dev, cmd, data, flag, p)
	dev_t dev;
	u_long cmd;
	caddr_t data;
	int flag;
	struct proc *p;
{
	struct ms_softc *ms;

	ms = ms_cd.cd_devs[minor(dev)];

	switch (cmd) {

	case FIONBIO:		/* we will remove this someday (soon???) */
		return (0);

	case FIOASYNC:
		ms->ms_events.ev_async = *(int *)data != 0;
		return (0);

	case FIOSETOWN:
		if (-*(int *)data != ms->ms_events.ev_io->p_pgid
		    && *(int *)data != ms->ms_events.ev_io->p_pid)
			return (EPERM);
		return (0);

	case TIOCSPGRP:
		if (*(int *)data != ms->ms_events.ev_io->p_pgid)
			return (EPERM);
		return (0);

	case VUIDGFORMAT:
		/* we only do firm_events */
		*(int *)data = VUID_FIRM_EVENT;
		return (0);

	case VUIDSFORMAT:
		if (*(int *)data != VUID_FIRM_EVENT)
			return (EINVAL);
		return (0);
	}
	return (ENOTTY);
}

int
mspoll(dev, events, p)
	dev_t dev;
	int events;
	struct proc *p;
{
	struct ms_softc *ms;

	ms = ms_cd.cd_devs[minor(dev)];
	return (ev_poll(&ms->ms_events, events, p));
}

int
mskqfilter(dev, kn)
	dev_t dev;
	struct knote *kn;
{
	struct ms_softc *ms;

	ms = ms_cd.cd_devs[minor(dev)];
	return (ev_kqfilter(&ms->ms_events, kn));
}

/****************************************************************
 * Middle layer (translator)
 ****************************************************************/

/*
 * Called by our ms_softint() routine on input.
 */
void
ms_input(ms, c)
	struct ms_softc *ms;
	int c;
{
	struct firm_event *fe;
	int mb, ub, d, get, put, any;
	static const char to_one[] = { 1, 2, 2, 4, 4, 4, 4 };
	static const int to_id[] = { MS_RIGHT, MS_MIDDLE, 0, MS_LEFT };

	/*
	 * Discard input if not ready.  Drop sync on parity or framing
	 * error; gain sync on button byte.
	 */
	if (ms->ms_ready == 0)
		return;
	if (c == -1) {
		ms->ms_byteno = -1;
		return;
	}
	if ((c & ~0x0f) == 0x80) {	/* if in 0x80..0x8f */
		if (c & 8) {
			ms->ms_byteno = 1;	/* short form (3 bytes) */
		} else {
			ms->ms_byteno = 0;	/* long form (5 bytes) */
		}
	}

	/*
	 * Run the decode loop, adding to the current information.
	 * We add, rather than replace, deltas, so that if the event queue
	 * fills, we accumulate data for when it opens up again.
	 */
	switch (ms->ms_byteno) {

	case -1:
		return;

	case 0:
		/* buttons (long form) */
		ms->ms_byteno = 2;
		ms->ms_mb = (~c) & 0x7;
		return;

	case 1:
		/* buttons (short form) */
		ms->ms_byteno = 4;
		ms->ms_mb = (~c) & 0x7;
		return;

	case 2:
		/* first delta-x */
		ms->ms_byteno = 3;
		ms->ms_dx += (char)c;
		return;

	case 3:
		/* first delta-y */
		ms->ms_byteno = 4;
		ms->ms_dy += (char)c;
		return;

	case 4:
		/* second delta-x */
		ms->ms_byteno = 5;
		ms->ms_dx += (char)c;
		return;

	case 5:
		/* second delta-y */
		ms->ms_byteno = -1;	/* wait for button-byte again */
		ms->ms_dy += (char)c;
		break;

	default:
		panic("ms_rint");
		/* NOTREACHED */
	}

#if NWSMOUSE > 0
	if (ms->ms_wsmousedev != NULL && ms->ms_ready == 2) {
		mb = ((ms->ms_mb & 4) >> 2) |
			(ms->ms_mb & 2) |
			((ms->ms_mb & 1) << 2);
		wsmouse_input(ms->ms_wsmousedev,
			      mb, ms->ms_dx, ms->ms_dy, 0,
			      WSMOUSE_INPUT_DELTA);
		ms->ms_dx = 0;
		ms->ms_dy = 0;
		return;
	}
#endif
	/*
	 * We have at least one event (mouse button, delta-X, or
	 * delta-Y; possibly all three, and possibly three separate
	 * button events).  Deliver these events until we are out
	 * of changes or out of room.  As events get delivered,
	 * mark them `unchanged'.
	 */
	any = 0;
	get = ms->ms_events.ev_get;
	put = ms->ms_events.ev_put;
	fe = &ms->ms_events.ev_q[put];

	/* NEXT prepares to put the next event, backing off if necessary */
#define	NEXT \
	if ((++put) % EV_QSIZE == get) { \
		put--; \
		goto out; \
	}
	/* ADVANCE completes the `put' of the event */
#define	ADVANCE \
	fe++; \
	if (put >= EV_QSIZE) { \
		put = 0; \
		fe = &ms->ms_events.ev_q[0]; \
	} \
	any = 1

	mb = ms->ms_mb;
	ub = ms->ms_ub;
	while ((d = mb ^ ub) != 0) {
		/*
		 * Mouse button change.  Convert up to three changes
		 * to the `first' change, and drop it into the event queue.
		 */
		NEXT;
		d = to_one[d - 1];		/* from 1..7 to {1,2,4} */
		fe->id = to_id[d - 1];		/* from {1,2,4} to ID */
		fe->value = mb & d ? VKEY_DOWN : VKEY_UP;
		fe->time = time;
		ADVANCE;
		ub ^= d;
	}
	if (ms->ms_dx) {
		NEXT;
		fe->id = LOC_X_DELTA;
		fe->value = ms->ms_dx;
		fe->time = time;
		ADVANCE;
		ms->ms_dx = 0;
	}
	if (ms->ms_dy) {
		NEXT;
		fe->id = LOC_Y_DELTA;
		fe->value = ms->ms_dy;
		fe->time = time;
		ADVANCE;
		ms->ms_dy = 0;
	}
out:
	if (any) {
		ms->ms_ub = ub;
		ms->ms_events.ev_put = put;
		EV_WAKEUP(&ms->ms_events);
	}
}