io/vuidmice/vuidm3p.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * 3-Byte Mouse Protocol
 */

#include <sys/param.h>
#include <sys/stream.h>
#include <sys/strsun.h>
#include <sys/vuid_event.h>
#include "vuidmice.h"

#define VUID_BUT(b)     BUT((b*2)+1)

/*
 * VUID_BUT(0)  BUT(1)      LEFT  BUTTON
 * VUID_BUT(1)  BUT(3)      RIGHT BUTTON
 */

#define MOUSE_BUTTON_L      (uchar_t)(0x20) /* Left button pressed  */
#define MOUSE_BUTTON_R      (uchar_t)(0x10) /* Right button pressed */

#define MOUSE_START_CODE    (uchar_t)(0x40) /* Start code in char   */

#define MOUSE_START     0       /* Beginning of packet  */
#define MOUSE_BUTTON        1       /* Got button status    */
#define MOUSE_DELTA_X       2       /* got delta X      */

extern void VUID_PUTNEXT(queue_t *const, uchar_t, uchar_t, uchar_t, int);

int
VUID_OPEN(queue_t *const qp)
{
    STATEP->nbuttons = 2;

    return (0);
}

static void
vuidm3p_sendButtonEvent(queue_t *const qp)
{
    int b;

    if ((STATEP->buttons == 0x30) && (!STATEP->oldbuttons)) {
        /*
         * both buttons going down simultaneously means button
         * two going down
         */
        vuidm3p_putnext(qp, (uchar_t)MS_MIDDLE, FE_PAIR_NONE, 0, 1);
        return;
    } else if ((!STATEP->buttons) && (STATEP->oldbuttons == 0x30)) {
        /*
         * both buttons going up simultaneously means button
         * two going up
         */
        vuidm3p_putnext(qp, (uchar_t)MS_MIDDLE, FE_PAIR_NONE, 0, 0);
        return;
    }

    /*
     * for each button, see if it has changed
     */
    for (b = 0; b < 2; b++) {
        uchar_t mask = 0x20 >> b;

        if ((STATEP->buttons & mask) != (STATEP->oldbuttons & mask))
            VUID_PUTNEXT(qp, VUID_BUT(b), FE_PAIR_NONE, 0,
                (STATEP->buttons & mask ? 1 : 0));
    }
}

void
vuidm3p(queue_t *const qp, mblk_t *mp)
{
    int r, code;
    uchar_t *bufp;

    bufp = mp->b_rptr;
    r = MBLKL(mp);

    for (r--; r >= 0; r--) {
        code = *bufp++;

        /* strip the high-order bit (mouse sends 7-bit data) */
        code &= 0x7f;

        switch (STATEP->state) {

        /*
         * Start state. We stay here if the start code is not
         * received thus forcing us back into sync. When we
         * get a start code the button mask comes with it
         * forcing us to the next state.
         */

        default:
        case MOUSE_START:
start_code:
            STATEP->deltax = STATEP->deltay = 0;

            /* look for sync */
            if ((code & MOUSE_START_CODE) == 0)
                break;

            STATEP->buttons = code & 0x30;

            if (STATEP->buttons != STATEP->oldbuttons) {
                vuidm3p_sendButtonEvent(qp);
                /*
                 * remember state
                 */
                STATEP->oldbuttons = STATEP->buttons;
            }

            /*
             * bits 0 & 1 are bits 6 & 7 of X value
             * (Sign extend them with the cast.)
             */
            STATEP->deltax = (signed char)((code & 0x03) << 6);

            /*
             * bits 2 & 3 are bits 6 & 7 of Y value
             * (Sign extend them with the cast.)
             */
            STATEP->deltay = (signed char)((code & 0x0c) << 4);

            /*
             * go to the next state
             */
            STATEP->state = MOUSE_BUTTON;
            break;

            /*
             * We receive the remaining 6 bits of delta x, forcing
             * us to the next state. We just piece the value of
             * delta x together.
             */
        case MOUSE_BUTTON:
            if (code & MOUSE_START_CODE) {
                STATEP->state = MOUSE_START;
                goto start_code;    /* restart */
            }

            STATEP->deltax |= code & 0x3f;
            STATEP->state = MOUSE_DELTA_X;
            break;

            /*
             * The last part of delta Y, and the packet
             * *may be* complete
             */
        case MOUSE_DELTA_X:
            if (code & MOUSE_START_CODE) {
                STATEP->state = MOUSE_START;
                goto start_code;    /* restart */
            }

            STATEP->deltay |= code & 0x3f;

            /*
             * generate motion Event
             */
            if (STATEP->deltax)
                VUID_PUTNEXT(qp, (uchar_t)LOC_X_DELTA,
                    FE_PAIR_ABSOLUTE, (uchar_t)LOC_X_ABSOLUTE,
                    STATEP->deltax);

            if (STATEP->deltay)
                VUID_PUTNEXT(qp, (uchar_t)LOC_Y_DELTA,
                    FE_PAIR_ABSOLUTE, (uchar_t)LOC_Y_ABSOLUTE,
                    -STATEP->deltay);

            STATEP->deltax = STATEP->deltay = 0;
            break;
        }
    }

    freemsg(mp);
}