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/*

 * Microwindows touch screen driver for ADS Graphics Client (www.flatpanels.com)

 *

 * Copyright (c) 2000 Century Software Embedded Technologies

 *

 * Requires /dev/ts kernel driver (char special 190,34)

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <fcntl.h>

#include <math.h>

#include <sys/ioctl.h>

#include "device.h"

/* file descriptor for touch panel */

static int pd_fd = -1;

/* Hack extern to used when hiding the mouse cursor

 * There needs to be a better way to do this

*/

extern SCREENDEVICE scrdev;

static int PD_Open(MOUSEDEVICE *pmd)

{

        /*

         * open up the touch-panel device.

         * Return the fd if successful, or negative if unsuccessful.

         */

        pd_fd = open("/dev/ts", O_NONBLOCK);

        if (pd_fd < 0) {

                EPRINTF("Error %d opening touch panel\n", errno);

                return -1;

        }

        GdHideCursor(&scrdev);

        return pd_fd;

}

static void PD_Close(void)

{

        /* Close the touch panel device. */

        EPRINTF("PD_Close called\n");

        if (pd_fd >= 0)

                close(pd_fd);

        pd_fd = -1;

}

static int PD_GetButtonInfo(void)

{

        /* get "mouse" buttons supported */

        return MWBUTTON_L;

}

static void PD_GetDefaultAccel(int *pscale,int *pthresh)

{

        /*

         * Get default mouse acceleration settings

         * This doesn't make sense for a touch panel.

         * Just return something inconspicuous for now.

         */

        *pscale = 3;

        *pthresh = 5;

}

static int PD_Read(MWCOORD *px, MWCOORD *py, MWCOORD *pz, int *pb)

{

        /* read a data point */

        short data[3];

        int bytes_read;

        bytes_read = read(pd_fd, data, sizeof(data));

        if (bytes_read != sizeof(data)) {

                if (errno == EINTR || errno == EAGAIN)

                        return 0;

                /*

                 * kernel driver bug: select returns read available,

                 * but read returns -1

                 * we return 0 here to avoid GsError above

                 */

                /*return -1;*/

                return 0;

        }

        *px = (MWCOORD)data[0];

        *py = (MWCOORD)data[1];

        *pb = (data[2]>0?MWBUTTON_L:0);

        *pz = 0;

        if((*px == -1 || *py == -1) && *pb >= 0)

                return 3;                       /* only have button data */

        else if((*px == -1 || *py == -1) && *pb < 0)

                return 0;                        /* don't have any data   */

        else

                return 2;                       /* have full set of data */

}

MOUSEDEVICE mousedev = {

        PD_Open,

        PD_Close,

        PD_GetButtonInfo,

        PD_GetDefaultAccel,

        PD_Read,

        NULL

};

#ifdef TEST

int main(int argc, char ** v)

{

        MWCOORD x, y, z;

        int     b;

        int result;

        int mouse = -1;

        DPRINTF("Opening touch panel...\n");

        if((result=PD_Open(0)) < 0)

                DPRINTF("Error %d, result %d opening touch-panel\n", errno, result);

        /* This stuff below can be used to set some of the parameters of the

         * driver from the command line before going in to the test loop.

         * Could this have been done better? Yup.

         */

        if(argc > 1) {

                ioctl(result,1,atoi(v[1]));

                DPRINTF("Setting pressure to %d\n",atoi(v[1]));

        }

        if(argc > 2) {

                ioctl(result,2,atoi(v[2]));

                DPRINTF("Setting updelay to %d\n",atoi(v[2]));

        }

        if(argc > 3) {

                ioctl(result,3,atoi(v[3]));

                DPRINTF("Setting raw x to %d\n",atoi(v[3]));

        }

        if(argc > 4) {

                ioctl(result,4,atoi(v[4]));

                DPRINTF("Setting raw y to %d\n",atoi(v[4]));

        }

        if(argc > 5) {

                ioctl(result,5,atoi(v[5]));

                DPRINTF("Setting res x to %d\n",atoi(v[5]));

        }

        if(argc > 6) {

                ioctl(result,6,atoi(v[6]));

                DPRINTF("Setting res y to %d\n",atoi(v[6]));

        }

        if(argc > 7) {

                ioctl(result,7,atoi(v[7]));

                DPRINTF("Setting fudge x to %d\n",atoi(v[7]));

        }

        if(argc > 8) {

                ioctl(result,8,atoi(v[8]));

                DPRINTF("Setting fudge y to %d\n",atoi(v[8]));

        }

        if(argc > 9) {

                ioctl(result,9,atoi(v[9]));

                DPRINTF("Setting average sample to %d\n",atoi(v[9]));

        }

        if(argc > 10) {

                ioctl(result,10,atoi(v[10]));

                DPRINTF("Setting raw min x to %d\n",atoi(v[10]));

        }

        if(argc > 11) {

                ioctl(result,11,atoi(v[11]));

                DPRINTF("Setting raw min y to %d\n",atoi(v[11]));

        }

        DPRINTF("Reading touch panel...\n");

        while(1) {

                result = PD_Read(&x, &y, &z, &b);

                if( result > 0) {

                        if(mouse != b) {

                                mouse = b;

                                if(mouse)

                                        DPRINTF("Pen Down\n");

                                else

                                        DPRINTF("Pen Up\n");

                        }

                        DPRINTF("%d,%d,%d,%d,%d\n", result, x, y, z, b);

                }

        }

}

#endif