/*** $Id: l7200.c,v 1.4 2004/06/25 08:06:00 yaoyy Exp $**** l7200.c: Low Level Input Engine for LinkUp System L7200 SDB**         This driver can run on Linux.** ** Copyright (C) 2004, Feynman Software.**** Created by Yao Yunyuan, 2004/06/20*//*** This program is free software; you can redistribute it and/or modify** it under the terms of the GNU General Public License as published by** the Free Software Foundation; either version 2 of the License, or** (at your option) any later version.**** This program is distributed in the hope that it will be useful,** but WITHOUT ANY WARRANTY; without even the implied warranty of** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the** GNU General Public License for more details.**** You should have received a copy of the GNU General Public License** along with this program; if not, write to the Free Software** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*/#include <stdio.h>#include <stdlib.h>#include <string.h>#include "common.h"#ifdef _L7200_IAL#include <unistd.h>#include <fcntl.h>#define TS_DEVICE   "/dev/tscreen"#include <sys/select.h>#include <sys/poll.h>#include "ial.h"#include "l7200.h"/* for data reading from /dev/l7200_ts */typedef struct {    short x;    short y;    short b;    short pad;} TS_EVENT;static int mousex = 0;static int mousey = 0;static int stylus = 0;static int ts = -1;#undef _DEBUG/************************  Low Level Input Operations **********************//* * Mouse operations -- Event */#define REP_COUNT   1static inline int get_middle (int *aa, int count){    int av = 0;    int i;    for (i = 0; i < count; i++) {        av += aa[i];    }    return av/count;}static int mouse_update(void){    int xa[REP_COUNT], ya[REP_COUNT];    int count = 0;    TS_EVENT cBuffer;    int rsize = 0;    while (1) {        rsize = read (ts, &cBuffer, sizeof (TS_EVENT));        if (rsize <= 0 || rsize != sizeof(TS_EVENT))            return 0;        if (cBuffer.b == 0) {            stylus = 0;            break;        }        xa[count] = cBuffer.x;        ya[count] = cBuffer.y;        if (count == REP_COUNT - 1)        {            mousex = get_middle (xa, REP_COUNT);            mousey = get_middle (ya, REP_COUNT);;            stylus = 1;            count = 0;            break;        }        count++;    }    return 1;}static void mouse_getxy(int *x, int* y){    *x = mousex;    *y = mousey;}static int mouse_getbutton(void){    return stylus ? 4 : 0;}#ifdef _LITE_VERSIONstatic int wait_event (int which, int maxfd, fd_set *in, fd_set *out, fd_set *except,                struct timeval *timeout)#elsestatic int wait_event (int which, fd_set *in, fd_set *out, fd_set *except,                struct timeval *timeout)#endif{    int retvalue = 0;    int e;    struct timeval stimeout;    stimeout.tv_usec = 10;    stimeout.tv_sec = 0;#ifdef _LITE_VERSION    e = select (maxfd + 1, in, out, except, &stimeout);#else    e = select (FD_SETSIZE, in, out, except, &stimeout);#endif    if (e < 0) {        return -1;    }    else if ((which & IAL_MOUSEEVENT) && ts >= 0) {        retvalue |= IAL_MOUSEEVENT;    }    return retvalue;}BOOL InitL7200Input (INPUT* input, const char* mdev, const char* mtype){    ts = open (TS_DEVICE, O_RDONLY | O_NONBLOCK);    if (ts < 0) {        fprintf (stderr, "Linkup: Can not open touch screen!\n");        return FALSE;    }    input->update_mouse = mouse_update;    input->get_mouse_xy = mouse_getxy;    input->set_mouse_xy = NULL;    input->get_mouse_button = mouse_getbutton;    input->set_mouse_range = NULL;    input->update_keyboard = NULL;    input->get_keyboard_state = NULL;    input->set_leds = NULL;    input->wait_event = wait_event;    mousex = 0;    mousey = 0;    return TRUE;}void TermL7200Input (void){    if (ts > 0)        close (ts);}#endif