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1707 palkovsky 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <ipc/ipc.h>
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#include <async.h>
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#include <kbd.h>
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#include <keys.h>
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#define i8042_MOUSE_DATA   0x20
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#define BUFSIZE 3
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typedef struct {
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    union {
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        unsigned char data[BUFSIZE];
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        struct {
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            unsigned leftbtn : 1;
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            unsigned rightbtn : 1;
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            unsigned middlebtn : 1;
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            unsigned isone : 1; /* Always one */
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            unsigned xsign : 1;
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            unsigned ysign : 1;
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            unsigned xovfl : 1;
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            unsigned yovfl : 1;
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            unsigned char x;
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            unsigned char y;
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        } val;
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    }u;
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}ps2packet_t;
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static ps2packet_t buf;
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static int bufpos = 0;
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static int leftbtn = 0;
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static int rightbtn = 0;
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static int middlebtn = 0;
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/** Convert 9-bit 2-complement signed number to integer */
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static int bit9toint(int sign, unsigned char data)
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{
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    int tmp;
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    if (!sign)
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        return data;
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    tmp = ((unsigned char)~data) + 1;
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    return -tmp;
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}
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/** Process mouse data
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 *
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 * @return True if mouse command was recognized and processed
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 */
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int mouse_arch_process(int phoneid, ipc_call_t *call)
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{
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    int status = IPC_GET_ARG1(*call);
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    int data = IPC_GET_ARG2(*call);
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    int x,y;
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    if (!(status & i8042_MOUSE_DATA))
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        return 0;
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    /* Check that we have not lost synchronization */
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    if (bufpos == 0 && !(data & 0x8))
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        return 1; /* Synchro lost, ignore byte */
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    buf.u.data[bufpos++] = data;
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    if (bufpos == BUFSIZE) {
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        bufpos = 0;
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        if (phoneid != -1) {
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            if (buf.u.val.leftbtn ^ leftbtn) {
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                leftbtn = buf.u.val.leftbtn;
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                async_msg(phoneid, KBD_MS_LEFT, leftbtn);
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            }
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            if (buf.u.val.rightbtn & rightbtn) {
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                rightbtn = buf.u.val.middlebtn;
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                async_msg(phoneid, KBD_MS_RIGHT, rightbtn);
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            }
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            if (buf.u.val.rightbtn & rightbtn) {
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                middlebtn = buf.u.val.middlebtn;
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                async_msg(phoneid, KBD_MS_MIDDLE, middlebtn);
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            }
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            x = bit9toint(buf.u.val.xsign, buf.u.val.x);
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            y = bit9toint(buf.u.val.ysign, buf.u.val.y);
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            if (x || y)
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                async_msg_2(phoneid, KBD_MS_MOVE, (ipcarg_t)x, (ipcarg_t)(-y));
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        }
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    }
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    return 1;
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}