/*
 * Copyright 1992 by the University of Guelph
 *
 * Permission to use, copy and modify this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting
 * documentation.
 * University of Guelph makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 */
/*
 * Driver for the Logitech and ATI Inport Bus mice for use with 386bsd and
 * the X386 port, courtesy of
 * Rick Macklem, rick@snowhite.cis.uoguelph.ca
 * Caveats: The driver currently uses spltty(), but doesn't use any
 * generic tty code. It could use splmse() (that only masks off the
 * bus mouse interrupt, but that would require hacking in i386/isa/icu.s.
 * (This may be worth the effort, since the Logitech generates 30/60
 * interrupts/sec continuously while it is open.)
 * NB: The ATI has NOT been tested yet!
 */

/*
 * Modification history:
 *
 * Oct 19, 1992 -- E. Stark (stark@cs.sunysb.edu)
 *   fixes to make it work with Microsoft InPort busmouse
 *
 * Jan, 1993 -- E. Stark (stark@cs.sunysb.edu)
 *   added patches for new "select" interface
 *
 * May 4, 1993 -- E. Stark (stark@cs.sunysb.edu)
 *   changed position of some spl()'s in mseread
 *
 * October 8, 1993 -- E. Stark (stark@cs.sunysb.edu)
 *   limit maximum negative x/y value to -127 to work around XFree problem
 *   that causes spurious button pushes.
 */

#include "mse.h"
#if NMSE > 0
#include "param.h"
#include "proc.h"
#include "user.h"
#include "buf.h"
#include "systm.h"
#include "kernel.h"
#include "ioctl.h"
#include "tty.h"
#include "uio.h"

#include "i386/isa/isa_device.h"
#include "i386/isa/icu.h"

static int mseprobe(struct isa_device *);
static int mseattach(struct isa_device *);
void mseintr(int);

struct	isa_driver msedriver = {
	mseprobe, mseattach, "mse"
};

/*
 * Software control structure for mouse. The sc_enablemouse(),
 * sc_disablemouse() and sc_getmouse() routines must be called spl'd().
 */
#define	PROTOBYTES	5
struct mse_softc {
	int	sc_flags;
	int	sc_mousetype;
	pid_t	sc_selp;
	u_int	sc_port;
	void	(*sc_enablemouse)();
	void	(*sc_disablemouse)();
	void	(*sc_getmouse)();
	int	sc_deltax;
	int	sc_deltay;
	int	sc_obuttons;
	int	sc_buttons;
	int	sc_bytesread;
	u_char	sc_bytes[PROTOBYTES];
} mse_sc[NMSE];

/* Flags */
#define	MSESC_OPEN	0x1
#define	MSESC_WANT	0x2

/* and Mouse Types */
#define	MSE_LOGITECH	0x1
#define	MSE_ATIINPORT	0x2

#define	MSE_PORTA	0
#define	MSE_PORTB	1
#define	MSE_PORTC	2
#define	MSE_PORTD	3

#define	MSE_UNIT(dev)		(minor(dev) >> 1)
#define	MSE_NBLOCKIO(dev)	(minor(dev) & 0x1)

/*
 * Logitech bus mouse definitions
 */
#define	MSE_SETUP	0x91	/* What does this mean? */
#define	MSE_HOLD	0x80
#define	MSE_RXLOW	0x00
#define	MSE_RXHIGH	0x20
#define	MSE_RYLOW	0x40
#define	MSE_RYHIGH	0x60
#define	MSE_DISINTR	0x10
#define MSE_INTREN	0x00

static int mse_probelogi();
static void mse_enablelogi(), mse_disablelogi(), mse_getlogi();

/*
 * ATI Inport mouse definitions
 */
#define	MSE_INPORT_RESET	0x80
#define	MSE_INPORT_STATUS	0x00
#define	MSE_INPORT_DX		0x01
#define	MSE_INPORT_DY		0x02
#define	MSE_INPORT_MODE		0x07
#define	MSE_INPORT_HOLD		0x20
#define	MSE_INPORT_INTREN	0x09

static int mse_probeati();
static void mse_enableati(), mse_disableati(), mse_getati();

#define	MSEPRI	(PZERO + 3)

/*
 * Table of mouse types.
 * Keep the Logitech last, since I haven't figured out how to probe it
 * properly yet. (Someday I'll have the documentation.)
 */
struct mse_types {
	int	m_type;		/* Type of bus mouse */
	int	(*m_probe)();	/* Probe routine to test for it */
	void	(*m_enable)();	/* Start routine */
	void	(*m_disable)();	/* Disable interrupts routine */
	void	(*m_get)();	/* and get mouse status */
} mse_types[] = {
	{ MSE_ATIINPORT, mse_probeati, mse_enableati, mse_disableati, mse_getati },
	{ MSE_LOGITECH, mse_probelogi, mse_enablelogi, mse_disablelogi, mse_getlogi },
	{ 0, },
};

int
mseprobe(idp)
	register struct isa_device *idp;
{
	register struct mse_softc *sc = &mse_sc[idp->id_unit];
	register int i;

	/*
	 * Check for each mouse type in the table.
	 */
	i = 0;
	while (mse_types[i].m_type) {
		if ((*mse_types[i].m_probe)(idp)) {
			sc->sc_mousetype = mse_types[i].m_type;
			sc->sc_enablemouse = mse_types[i].m_enable;
			sc->sc_disablemouse = mse_types[i].m_disable;
			sc->sc_getmouse = mse_types[i].m_get;
			return (1);
		}
		i++;
	}
	return (0);
}

int
mseattach(idp)
	struct isa_device *idp;
{
	struct mse_softc *sc = &mse_sc[idp->id_unit];

	sc->sc_port = idp->id_iobase;
	return (1);
}

/*
 * Exclusive open the mouse, initialize it and enable interrupts.
 */
int
mseopen(dev, flag)
	dev_t dev;
	int flag;
{
	register struct mse_softc *sc;
	int s;

	if (MSE_UNIT(dev) >= NMSE)
		return (ENXIO);
	sc = &mse_sc[MSE_UNIT(dev)];
	if (sc->sc_flags & MSESC_OPEN)
		return (EBUSY);
	sc->sc_flags |= MSESC_OPEN;
	sc->sc_obuttons = sc->sc_buttons = 0x7;
	sc->sc_deltax = sc->sc_deltay = 0;
	sc->sc_bytesread = PROTOBYTES;

	/*
	 * Initialize mouse interface and enable interrupts.
	 */
	s = spltty();
	(*sc->sc_enablemouse)(sc->sc_port);
	splx(s);
	return (0);
}

/*
 * mseclose: just turn off mouse innterrupts.
 */
int
mseclose(dev, flag)
	dev_t dev;
	int flag;
{
	struct mse_softc *sc = &mse_sc[MSE_UNIT(dev)];
	int s;

	s = spltty();
	(*sc->sc_disablemouse)(sc->sc_port);
	sc->sc_flags &= ~MSESC_OPEN;
	splx(s);
	return(0);
}

/* 
 * mseread: return mouse info using the MSC serial protocol, but without
 * using bytes 4 and 5.
 * (Yes this is cheesy, but it makes the X386 server happy, so...)
 */
int
mseread(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	register struct mse_softc *sc = &mse_sc[MSE_UNIT(dev)];
	int xfer, s, error;

	/*
	 * If there are no protocol bytes to be read, set up a new protocol
	 * packet.
	 */
	s = spltty(); /* XXX Should be its own spl, but where is imlXX() */
	if (sc->sc_bytesread >= PROTOBYTES) {
		while (sc->sc_deltax == 0 && sc->sc_deltay == 0 &&
		       (sc->sc_obuttons ^ sc->sc_buttons) == 0) {
			if (MSE_NBLOCKIO(dev)) {
				splx(s);
				return (0);
			}
			sc->sc_flags |= MSESC_WANT;
			if (error = tsleep((caddr_t)sc, MSEPRI | PCATCH,
				"mseread", 0)) {
				splx(s);
				return (error);
			}
		}

		/*
		 * Generate protocol bytes.
		 * For some reason X386 expects 5 bytes but never uses
		 * the fourth or fifth?
		 */
		sc->sc_bytes[0] = 0x80 | (sc->sc_buttons & ~0xf8);
		if (sc->sc_deltax > 127)
			sc->sc_deltax = 127;
		if (sc->sc_deltax < -127)
			sc->sc_deltax = -127;
		sc->sc_deltay = -sc->sc_deltay;	/* Otherwise mousey goes wrong way */
		if (sc->sc_deltay > 127)
			sc->sc_deltay = 127;
		if (sc->sc_deltay < -127)
			sc->sc_deltay = -127;
		sc->sc_bytes[1] = sc->sc_deltax;
		sc->sc_bytes[2] = sc->sc_deltay;
		sc->sc_bytes[3] = sc->sc_bytes[4] = 0;
		sc->sc_obuttons = sc->sc_buttons;
		sc->sc_deltax = sc->sc_deltay = 0;
		sc->sc_bytesread = 0;
	}
	splx(s);
	xfer = MIN(uio->uio_resid, PROTOBYTES - sc->sc_bytesread);
	if (error = uiomove(&sc->sc_bytes[sc->sc_bytesread], xfer, uio))
		return (error);
	sc->sc_bytesread += xfer;
	return(0);
}

/*
 * mseselect: check for mouse input to be processed.
 */
int
mseselect(dev, rw, p)
	dev_t dev;
	int rw;
	struct proc *p;
{
	register struct mse_softc *sc = &mse_sc[MSE_UNIT(dev)];
	int s;

	s = spltty();
	if (sc->sc_bytesread != PROTOBYTES || sc->sc_deltax != 0 ||
	    sc->sc_deltay != 0 || (sc->sc_obuttons ^ sc->sc_buttons) != 0) {
		splx(s);
		return (1);
	}

	/*
	 * Since this is an exclusive open device, any previous proc.
	 * pointer is trash now, so we can just assign it.
	 */
	sc->sc_selp = p->p_pid;
	splx(s);
	return (0);
}

/*
 * mseintr: update mouse status. sc_deltax and sc_deltay are accumulative.
 */
void
mseintr(unit)
	int unit;
{
	register struct mse_softc *sc = &mse_sc[unit];
	pid_t p;

#ifdef DEBUG
	static int mse_intrcnt = 0;
	if((mse_intrcnt++ % 10000) == 0)
		printf("mseintr\n");
#endif /* DEBUG */
	if ((sc->sc_flags & MSESC_OPEN) == 0)
		return;

	(*sc->sc_getmouse)(sc->sc_port, &sc->sc_deltax, &sc->sc_deltay, &sc->sc_buttons);

	/*
	 * If mouse state has changed, wake up anyone wanting to know.
	 */
	if (sc->sc_deltax != 0 || sc->sc_deltay != 0 ||
	    (sc->sc_obuttons ^ sc->sc_buttons) != 0) {
		if (sc->sc_flags & MSESC_WANT) {	
			sc->sc_flags &= ~MSESC_WANT;	
			wakeup((caddr_t)sc);	
		}	
		if (sc->sc_selp) {	
			p = sc->sc_selp;	
			sc->sc_selp = (pid_t)0;	
			selwakeup(p, 0);	
		}	
	}
}

/*
 * Routines for the Logitech mouse.
 */
/*
 * Test for a Logitech bus mouse and return 1 if it is.
 * (until I know how to use the signature port properly, just disable
 *  interrupts and return 1)
 */
static int
mse_probelogi(idp)
	register struct isa_device *idp;
{

	outb(idp->id_iobase + MSE_PORTB, 0x55);
	if (inb(idp->id_iobase + MSE_PORTB) == 0x55) {
		outb(idp->id_iobase + MSE_PORTB, 0xaa);
		if (inb(idp->id_iobase + MSE_PORTB) == 0xaa)
			return (1);
	}
	return (0);
}

/*
 * Initialize Logitech mouse and enable interrupts.
 */
static void
mse_enablelogi(port)
	register u_int port;
{
	int dx, dy, but;

	outb(port + MSE_PORTD, MSE_SETUP);
	mse_getlogi(port, &dx, &dy, &but);
}

/*
 * Disable interrupts for Logitech mouse.
 */
static void
mse_disablelogi(port)
	register u_int port;
{

	outb(port + MSE_PORTC, MSE_DISINTR);
}

/*
 * Get the current dx, dy and button up/down state.
 */
static void
mse_getlogi(port, dx, dy, but)
	register u_int port;
	int *dx;
	int *dy;
	int *but;
{
	register char x, y;

	outb(port + MSE_PORTC, MSE_HOLD | MSE_RXLOW);
	x = inb(port + MSE_PORTA);
	*but = (x >> 5) & 0x7;
	x &= 0xf;
	outb(port + MSE_PORTC, MSE_HOLD | MSE_RXHIGH);
	x |= (inb(port + MSE_PORTA) << 4);
	outb(port + MSE_PORTC, MSE_HOLD | MSE_RYLOW);
	y = (inb(port + MSE_PORTA) & 0xf);
	outb(port + MSE_PORTC, MSE_HOLD | MSE_RYHIGH);
	y |= (inb(port + MSE_PORTA) << 4);
	*dx += x;
	*dy += y;
	outb(port + MSE_PORTC, MSE_INTREN);
}

/*
 * Routines for the ATI Inport bus mouse.
 */
/*
 * Test for a ATI Inport bus mouse and return 1 if it is.
 * (do not enable interrupts)
 */
static int
mse_probeati(idp)
	register struct isa_device *idp;
{
	int i;

	for (i = 0; i < 2; i++)
		if (inb(idp->id_iobase + MSE_PORTC) == 0xde)
			return (1);
	return (0);
}

/*
 * Initialize ATI Inport mouse and enable interrupts.
 */
static void
mse_enableati(port)
	register u_int port;
{

	outb(port + MSE_PORTA, MSE_INPORT_RESET);
	outb(port + MSE_PORTA, MSE_INPORT_MODE);
	outb(port + MSE_PORTB, MSE_INPORT_INTREN);
}

/*
 * Disable interrupts for ATI Inport mouse.
 */
static void
mse_disableati(port)
	register u_int port;
{

	outb(port + MSE_PORTA, MSE_INPORT_MODE);
	outb(port + MSE_PORTB, 0);
}

/*
 * Get current dx, dy and up/down button state.
 */
static void
mse_getati(port, dx, dy, but)
	register u_int port;
	int *dx;
	int *dy;
	int *but;
{
	register char byte;

	outb(port + MSE_PORTA, MSE_INPORT_MODE);
	outb(port + MSE_PORTB, MSE_INPORT_HOLD);
	outb(port + MSE_PORTA, MSE_INPORT_STATUS);
	*but = ~(inb(port + MSE_PORTB) & 0x7);
	outb(port + MSE_PORTA, MSE_INPORT_DX);
	byte = inb(port + MSE_PORTB);
	*dx += byte;
	outb(port + MSE_PORTA, MSE_INPORT_DY);
	byte = inb(port + MSE_PORTB);
	*dy += byte;
	outb(port + MSE_PORTA, MSE_INPORT_MODE);
	outb(port + MSE_PORTB, MSE_INPORT_INTREN);
}
#endif /* NMSE */