ts_srv.c

/*
 * This is a userspace touchscreen driver for cypress ctma395 as used
 * in HP Touchpad configured for WebOS.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * The code was written from scrath, the hard math and understanding the
 * device output by jonpry @ gmail
 * uinput bits and the rest by Oleg Drokin green@linuxhacker.ru
 * Multitouch detection by Rafael Brune mail@rbrune.de
 *
 * Copyright (c) 2011 CyanogenMod Touchpad Project.
 *
 *
 */

#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>

#include <linux/input.h>
#include <linux/uinput.h>
#include "hsuart.h"
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <sys/select.h>

#if 1
// This is for Android (or OS using Android kernel)
#define UINPUT_LOCATION "/dev/uinput"
#else
// This is for webos and possibly other Linuxes
#define UINPUT_LOCATION "/dev/input/uinput"
#endif

/* Set to 1 to print coordinates to stdout. */
#define DEBUG 0
#define DEBUGMORE 0
#define SEND_TRACK 1

#define INVERTXY 1

/* Set to 1 to see raw data from the driver */
#define RAW_DATA_DEBUG 0

#define WANT_MULTITOUCH 1
#define WANT_SINGLETOUCH 0

#define RECV_BUF_SIZE 1540
#define LIFTOFF_TIMEOUT 40000 /* 20ms */

#define MAX_CLIST 75

unsigned char cline[64];
unsigned int cidx=0;
unsigned char matrix[30][40]; 
int uinput_fd;

int touchscreen_power(int enable)
{
	/** TS power stuff */
	int vdd_fd, xres_fd, wake_fd, i2c_fd;

    struct i2c_rdwr_ioctl_data i2c_ioctl_data;
    struct i2c_msg i2c_msg;
    __u8 i2c_buf[16];
    int rc;

	/* TS file descriptors. Ignore errors. */
	vdd_fd = open("/sys/devices/platform/cy8ctma395/vdd", O_WRONLY);
	if (vdd_fd < 0) {
		fprintf(stderr, "TScontrol: Cannot open vdd - %d", errno);
		return -1;
	}
		
	xres_fd = open("/sys/devices/platform/cy8ctma395/xres", O_WRONLY);
	if (xres_fd < 0) {
		fprintf(stderr, "TScontrol: Cannot open xres - %d", errno);
		return -1;
	}

	wake_fd = open("/sys/user_hw/pins/ctp/wake/level", O_WRONLY);
	if (wake_fd < 0) {
		fprintf(stderr, "TScontrol: Cannot open wake - %d", errno);
		return -1;
	}

	i2c_fd = open("/dev/i2c-5", O_RDWR);
	if (i2c_fd < 0) {
		fprintf(stderr, "TScontrol: Cannot open i2c dev - %d", errno);
		return -1;
	}

    if (enable) {
		int retry_count = 0;

try_again:
		/* Set reset so the chip immediatelly sees it */
        lseek(xres_fd, 0, SEEK_SET);
        rc = write(xres_fd, "1", 1);
		if (rc != 1) fprintf(stderr, "TSpower, failed set xres");

		/* Then power on */
        lseek(vdd_fd, 0, SEEK_SET);
        rc = write(vdd_fd, "1", 1);
		if (rc != 1) fprintf(stderr, "TSpower, failed to enable vdd");

		/* Sleep some more for the voltage to stabilize */
        usleep(50000);

        lseek(wake_fd, 0, SEEK_SET);
        rc = write(wake_fd, "1", 1);
		if (rc != 1) fprintf(stderr, "TSpower, failed to assert wake");

        lseek(xres_fd, 0, SEEK_SET);
        rc = write(xres_fd, "0", 1);
		if (rc != 1) fprintf(stderr, "TSpower, failed to reset xres");

        usleep(50000);

        lseek(wake_fd, 0, SEEK_SET);
        rc = write(wake_fd, "0", 1);
		if (rc != 1) fprintf(stderr, "TSpower, failed to deassert wake");

        usleep(50000);

        i2c_ioctl_data.nmsgs = 1;
        i2c_ioctl_data.msgs = &i2c_msg;

        i2c_msg.addr = 0x67;
        i2c_msg.flags = 0;
        i2c_msg.buf = i2c_buf;

        i2c_msg.len = 2;
        i2c_buf[0] = 0x08; i2c_buf[1] = 0;
        rc = ioctl(i2c_fd,I2C_RDWR,&i2c_ioctl_data);
		if ( rc != 1) fprintf(stderr,
				"TSPower, ioctl1 failed %d errno %d\n", rc, errno);

		/* Ok, so the TS failed to wake, we need to retry a few times
         * before totally giving up */
		if ((rc != 1) && (retry_count++ < 3)) {
			lseek(vdd_fd, 0, SEEK_SET);
			rc = write(vdd_fd, "0", 1);
			usleep(10000);
			fprintf(stderr, "TS wakeup retry #%d\n", retry_count);
			goto try_again;
		}

        i2c_msg.len = 6;
        i2c_buf[0] = 0x31; i2c_buf[1] = 0x01; i2c_buf[2] = 0x08;
        i2c_buf[3] = 0x0C; i2c_buf[4] = 0x0D; i2c_buf[5] = 0x0A;
        rc = ioctl(i2c_fd,I2C_RDWR,&i2c_ioctl_data);
		if (rc != 1) fprintf(stderr,
				"TSPower, ioctl2 failed %d errno %d\n", rc, errno);


        i2c_msg.len = 2;
        i2c_buf[0] = 0x30; i2c_buf[1] = 0x0F;
        rc = ioctl(i2c_fd,I2C_RDWR,&i2c_ioctl_data);
		if (rc != 1) fprintf(stderr,
				"TSPower, ioctl3 failed %d errno %d\n", rc, errno);

        i2c_buf[0] = 0x40; i2c_buf[1] = 0x02;
        rc = ioctl(i2c_fd,I2C_RDWR,&i2c_ioctl_data);
		if (rc != 1) fprintf(stderr,
				"TSPower, ioctl4 failed %d errno %d\n", rc, errno);

        i2c_buf[0] = 0x41; i2c_buf[1] = 0x10;
        rc = ioctl(i2c_fd,I2C_RDWR,&i2c_ioctl_data);
		if (rc != 1) fprintf(stderr,
				"TSPower, ioctl5 failed %d errno %d\n", rc, errno);

        i2c_buf[0] = 0x0A; i2c_buf[1] = 0x04;
        rc = ioctl(i2c_fd,I2C_RDWR,&i2c_ioctl_data);
		if (rc != 1) fprintf(stderr,
				"TSPower, ioctl6 failed %d errno %d\n", rc, errno);

        i2c_buf[0] = 0x08; i2c_buf[1] = 0x03;
        rc = ioctl(i2c_fd,I2C_RDWR,&i2c_ioctl_data);
		if (rc != 1) fprintf(stderr,
				"TSPower, ioctl7 failed %d errno %d\n", rc, errno);

        lseek(wake_fd, 0, SEEK_SET);
        rc = write(wake_fd, "1", 1);
		if (rc != 1) fprintf(stderr,
				"TSpower, failed to assert wake again");
	} else {
		lseek(vdd_fd, 0, SEEK_SET);
		rc = write(vdd_fd, "0", 1);
		if (rc != 1) fprintf(stderr, "TSpower, failed to disable vdd");
		/* XXX, should be correllated with LIFTOFF_TIMEOUT in ts driver */
		usleep(80000);
	}
	return 0;
}

int send_uevent(int fd, __u16 type, __u16 code, __s32 value)
{
	struct input_event event;

    memset(&event, 0, sizeof(event));
    event.type = type;
    event.code = code;
    event.value = value;
    gettimeofday(&event.time, NULL);

    if (write(fd, &event, sizeof(event)) != sizeof(event)) {
        fprintf(stderr, "Error on send_event %d", sizeof(event));
        return -1;
    }

    return 0;
}


struct candidate {
	int pw;
	int i;
	int j;
};

struct touchpoint {
	int pw;
	float i;
	float j;
};

int tpcmp(const void *v1, const void *v2)
{
    return ((*(struct candidate *)v2).pw - (*(struct candidate *)v1).pw);
}

#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))

int dist(int x1, int y1, int x2, int y2)  {
       return pow(x1 - x2, 2)+pow(y1 - y2, 2);
}


#if WANT_MULTITOUCH
void calc_point()
{
	int i,j;
	int tweight=0;
	float isum=0, jsum=0;
	float avgi, avgj;
	float xval, yval;
	float powered;
	
	int tpc=0;
	struct touchpoint tpoint[10];

	int clc=0;
	struct candidate clist[MAX_CLIST];
	
	// generate list of high values
	for(i=0; i < 30; i++) {
		for(j=0; j < 40; j++) {
#if RAW_DATA_DEBUG
			printf("%2.2X ", matrix[i][j]);
#endif
			if(matrix[i][j] > 32 && clc < MAX_CLIST) {
				int cvalid=1;
				clist[clc].pw = matrix[i][j];
				clist[clc].i = i;
				clist[clc].j = j;
				//check if local maxima
				if(i>0  && matrix[i-1][j] > matrix[i][j]) cvalid = 0;
				if(i<29 && matrix[i+1][j] > matrix[i][j]) cvalid = 0;
				if(j>0  && matrix[i][j-1] > matrix[i][j]) cvalid = 0;
				if(j<39 && matrix[i][j+1] > matrix[i][j]) cvalid = 0; 
				if(cvalid) clc++;
			}
		}
#if RAW_DATA_DEBUG
		printf("\n");
#endif
	}
#if DEBUGMORE
	printf("%d clc\n", clc);
#endif

	// sort candidate list by strength
	//qsort(clist, clc, sizeof(clist[0]), tpcmp);

#if DEBUGMORE
	printf("%d %d %d \n", clist[0].pw, clist[1].pw, clist[2].pw);
#endif

	int k, l;
	for(k=0; k < MIN(clc, 20); k++) {
		int newtp=1;

		int rad=3; // radius around candidate to use for calculation
		int mini = clist[k].i - rad+1;
		int maxi = clist[k].i + rad;
		int minj = clist[k].j - rad+1;
		int maxj = clist[k].j + rad;
		
		// discard points close to already detected touches
		for(l=0; l<tpc; l++) {
			// if(tpoint[l].i >= mini 
			// 		&& tpoint[l].i < maxi 
			// 		&& tpoint[l].j >= minj 
			// 		&& tpoint[l].j < maxj) newtp=0;
			if(tpoint[l].i >= mini+1 && tpoint[l].i < maxi-1 && tpoint[l].j >= minj+1 && tpoint[l].j < maxj-1) newtp=0;		
		}
		
		// calculate new touch near the found candidate
		if(newtp && tpc < 10) {
			tweight=0;
			isum=0;
			jsum=0;
			for(i=MAX(0, mini); i < MIN(30, maxi); i++) {
				for(j=MAX(0, minj); j < MIN(40, maxj); j++) {
					//powered = pow(matrix[i][j], 1.5);
                    //printf("d= %d\n", dist(i,j,clist[k].i,clist[k].j));
                    int dd = dist(i,j,clist[k].i,clist[k].j);
                    powered = matrix[i][j];
                    //if(dd <= 1) powered = matrix[i][j];
                    if (dd == 2 
							&& 0.65f * matrix[clist[k].i][clist[k].j]
								< matrix[i][j] )
						powered = 0.65f * matrix[clist[k].i][clist[k].j];
                    if (dd == 4 
							&& 0.15f * matrix[clist[k].i][clist[k].j]
								< matrix[i][j] )
						powered = 0.15f * matrix[clist[k].i][clist[k].j];
                    if (dd == 5 
							&& 0.10f * matrix[clist[k].i][clist[k].j]
								< matrix[i][j] )
						powered = 0.10f * matrix[clist[k].i][clist[k].j];
                    if (dd == 8 
							&& 0.05f * matrix[clist[k].i][clist[k].j] 
								< matrix[i][j] )
						powered = 0.05f * matrix[clist[k].i][clist[k].j];
					
					powered = pow(powered, 1.5);

                    tweight += powered;
                    isum += powered * i;
                    jsum += powered * j;
				}
			}
			avgi = isum / (float)tweight;
			avgj = jsum / (float)tweight;
			tpoint[tpc].pw = tweight;
			tpoint[tpc].i = avgi;
			tpoint[tpc].j = avgj;
			tpc++;


#if INVERTXY
		yval = 768 - avgi*768/29;
		xval = 1024 - avgj*1024/39;
#else
		xval = avgi*768/29;
		yval = 1024.0-avgj*1024/39;
#endif

#if SEND_TRACK
			/* Android does not need this an it simplifies stuff
			 * for us as we don't need to track individual touches
			 */
			send_uevent(uinput_fd, EV_ABS, ABS_MT_TRACKING_ID, tpc);
#endif
			send_uevent(uinput_fd, EV_ABS, ABS_MT_TOUCH_MAJOR, 1);
			send_uevent(uinput_fd, EV_ABS, ABS_MT_WIDTH_MAJOR, 10);
			send_uevent(uinput_fd, EV_ABS, ABS_MT_POSITION_X, xval);
			send_uevent(uinput_fd, EV_ABS, ABS_MT_POSITION_Y, yval);
			send_uevent(uinput_fd, EV_SYN, SYN_MT_REPORT, 0);

#if DEBUG
			printf("Coords %d %lf, %lf, %lf, %lf, %d\n",
					tpc, avgi, avgj, xval, yval, tweight);
#endif

		}
	}

	send_uevent(uinput_fd, EV_SYN, SYN_REPORT, 0);
}
#endif


#if WANT_SINGLETOUCH
void calc_point()
{
	int i,j;
	int tweight=0;
	float xsum=0, ysum=0;
	float avgx, avgy;
	float xval, yval;
	float powered;

	for(i=0; i < 30; i++)
	{
		for(j=0; j < 40; j++)
		{
			if(matrix[i][j] < 3)
				matrix[i][j] = 0;
#if RAW_DATA_DEBUG
			printf("%2.2X ", matrix[i][j]);
#endif

			powered = pow(matrix[i][j],1.5);
			tweight += powered;
			ysum += powered * j;
			xsum += powered * i;
		}
#if RAW_DATA_DEBUG
		printf("\n");
#endif
	}
	avgx = xsum / (float)tweight;
	avgy = ysum / (float)tweight;

#if INVERTXY
	yval = 768 - avgx*768/29;
	xval = 1024 - avgy*1024/39;
#else
	xval = avgx*768/29;
	yval = 1024.0-avgy*1024/39;
#endif

	if (tweight > 200) {
		/* Single touch signals */
		send_uevent(uinput_fd, EV_ABS, ABS_X, xval);
		send_uevent(uinput_fd, EV_ABS, ABS_Y, yval);
		send_uevent(uinput_fd, EV_ABS, ABS_PRESSURE, 1);
		send_uevent(uinput_fd, EV_ABS, ABS_TOOL_WIDTH, 10);
		send_uevent(uinput_fd, EV_KEY, BTN_TOUCH, 1);

		send_uevent(uinput_fd, EV_SYN, SYN_REPORT, 0);
		
#if DEBUG
		printf("Coords %lf, %lf, %lf, %lf, %d\n",
				avgx,avgy, xval, yval, tweight);
#endif
	}

}
#endif

void put_byte(unsigned char byte)
{
//	printf("Putc %d %d\n", cidx, byte);
	if (cidx==0 && byte != 0xFF) return;

	// Sometimes a send is aborted by the touch screen.
	// all we get is an out of place 0xFF
	if (byte == 0xFF && !cline_valid(1)) cidx = 0;
	cline[cidx++] = byte;
}

int cline_valid(int extras)
{
	if(cline[0] == 0xff && cline[1] == 0x43 && cidx == 44-extras)
	{
//		printf("cidx %d\n", cline[cidx-1]);
		return 1;
	}
	if (cline[0] == 0xff && cline[1] == 0x47 
		&& cidx > 4 && cidx == (cline[2]+4-extras))
	{
//		printf("cidx %d\n", cline[cidx-1]);
		return 1;
	}
	return 0;
}

void consume_line()
{
	int i,j;

	if(cline[1] == 0x47)
	{
		// Calculate the data points. All transfers complete.
		calc_point();
	}

	if(cline[1] == 0x43)
	{
		// This is a start event. Clear the matrix.
		if(cline[2] & 0x80)
		{
			for(i=0; i < 30; i++)
				for(j=0; j < 40; j++)
					matrix[i][j] = 0;
		}

		// Write the line into the matrix.
		for(i=0; i < 40; i++)
			matrix[cline[2] & 0x1F][i] = cline[i+3];
	}

//	printf("Received %d bytes\n", cidx-1);
		
/*		for(i=0; i < cidx; i++)
			printf("%2.2X ",cline[i]);
		printf("\n");	*/
	cidx = 0;
}

void snarf2(unsigned char* bytes, int size)
{
	int i=0;
	while (i < size)
	{
		while (i < size)
		{
			put_byte(bytes[i]);
			i++;
			if (cline_valid(0))
			{
//				printf("was valid\n");
				break;
			}
		}

		if(i >= size)
			break;

//		printf("Cline went valid\n");
		consume_line();
	}

	if(cline_valid(0))
	{
		consume_line();
//		printf("was valid2\n");
	}
}

void open_uinput()
{
    struct uinput_user_dev device;
    struct input_event myevent;
    int i,ret = 0;

    memset(&device, 0, sizeof device);

    uinput_fd = open(UINPUT_LOCATION,O_WRONLY);
    strcpy(device.name,"HPTouchpad");

    device.id.bustype = BUS_VIRTUAL;
    device.id.vendor = 1;
    device.id.product = 1;
    device.id.version = 1;


    for (i=0; i < ABS_MAX; i++) {
        device.absmax[i] = -1;
        device.absmin[i] = -1;
        device.absfuzz[i] = -1;
        device.absflat[i] = -1;
    }

#if INVERTXY
    device.absmax[ABS_Y] = 768;
    device.absmax[ABS_X] = 1024;
#else
    device.absmax[ABS_Y] = 1024;
    device.absmax[ABS_X] = 768;
#endif
    device.absmin[ABS_X] = 0;
    device.absfuzz[ABS_X] = 1;
    device.absflat[ABS_X] = 0;
    device.absmin[ABS_Y] = 0;
    device.absfuzz[ABS_Y] = 1;
    device.absflat[ABS_Y] = 0;
    device.absmin[ABS_PRESSURE] = 0;
    device.absmax[ABS_PRESSURE] = 1;
    device.absfuzz[ABS_PRESSURE] = 0;
    device.absflat[ABS_PRESSURE] = 0;
#if WANT_MULTITOUCH
#if INVERTXY
    device.absmax[ABS_MT_POSITION_X] = 1024;
    device.absmax[ABS_MT_POSITION_Y] = 768;
#else
    device.absmax[ABS_MT_POSITION_X] = 768;
    device.absmax[ABS_MT_POSITION_Y] = 1024;
#endif
    device.absmin[ABS_MT_POSITION_X] = 0;
    device.absfuzz[ABS_MT_POSITION_X] = 1;
    device.absflat[ABS_MT_POSITION_X] = 0;
    device.absmin[ABS_MT_POSITION_Y] = 0;
    device.absfuzz[ABS_MT_POSITION_Y] = 1;
    device.absflat[ABS_MT_POSITION_Y] = 0;
    device.absmax[ABS_MT_TOUCH_MAJOR] = 1;
    device.absmax[ABS_MT_WIDTH_MAJOR] = 100;
#endif


    if (write(uinput_fd,&device,sizeof(device)) != sizeof(device))
    {
        fprintf(stderr, "error setup\n");
    }

    if (ioctl(uinput_fd,UI_SET_EVBIT,EV_KEY) < 0)
        fprintf(stderr, "error evbit key\n");

    if (ioctl(uinput_fd,UI_SET_EVBIT, EV_SYN) < 0)
        fprintf(stderr, "error evbit key\n");

    if (ioctl(uinput_fd,UI_SET_EVBIT,EV_ABS) < 0)
            fprintf(stderr, "error evbit rel\n");

#if 1
    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_X) < 0)
            fprintf(stderr, "error x rel\n");

    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_Y) < 0)
            fprintf(stderr, "error y rel\n");

    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_PRESSURE) < 0)
            fprintf(stderr, "error pressure rel\n");

    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_TOOL_WIDTH) < 0)
            fprintf(stderr, "error tool rel\n");
#endif

#if SEND_TRACK
    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_MT_TRACKING_ID) < 0)
            fprintf(stderr, "error trkid rel\n");
#endif

#if WANT_MULTITOUCH
    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_MT_TOUCH_MAJOR) < 0)
            fprintf(stderr, "error tool rel\n");

    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_MT_WIDTH_MAJOR) < 0)
            fprintf(stderr, "error tool rel\n");

    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_MT_POSITION_X) < 0)
            fprintf(stderr, "error tool rel\n");

    if (ioctl(uinput_fd,UI_SET_ABSBIT,ABS_MT_POSITION_Y) < 0)
            fprintf(stderr, "error tool rel\n");
#endif

#if 1
    if (ioctl(uinput_fd,UI_SET_KEYBIT,BTN_TOUCH) < 0)
            fprintf(stderr, "error evbit rel\n");
#endif

    if (ioctl(uinput_fd,UI_DEV_CREATE) < 0)
    {
        fprintf(stderr, "error create\n");
    }

}

int main(int argc, char** argv)
{
	struct hsuart_mode uart_mode;
	int uart_fd, nbytes, i; 
	char recv_buf[RECV_BUF_SIZE];
	fd_set fdset;
	struct timeval seltmout;

	if (touchscreen_power(1)) {
		printf("Unable to enable touchscreen power\n");
		return 1;
	}

	uart_fd = open("/dev/ctp_uart", O_RDONLY|O_NONBLOCK);
	if (uart_fd <= 0)
	{
		printf("Could not open uart\n");
		return 1;
	}

	open_uinput();

	ioctl(uart_fd,HSUART_IOCTL_GET_UARTMODE,&uart_mode);
	uart_mode.speed = 0x3D0900;
	ioctl(uart_fd, HSUART_IOCTL_SET_UARTMODE,&uart_mode);

	ioctl(uart_fd, HSUART_IOCTL_FLUSH, 0x9);

	while (1)
	{
	    // usleep(50000);
		FD_ZERO(&fdset);
		FD_SET(uart_fd, &fdset);
		seltmout.tv_sec = 0;
		/* 2x tmout */
		seltmout.tv_usec = LIFTOFF_TIMEOUT;

		if (0 == select(uart_fd+1, &fdset, NULL, NULL, &seltmout)) {
			/* Timeout means liftoff, send event */
#if DEBUG
			printf("timeout! sending liftoff\n");
#endif
#if 1
			send_uevent(uinput_fd, EV_ABS, ABS_PRESSURE, 0);
//			send_uevent(uinput_fd, EV_ABS, BTN_2, 0);
			send_uevent(uinput_fd, EV_KEY, BTN_TOUCH, 0);
#endif

#if WANT_MULTITOUCH
#if SEND_TRACK
			send_uevent(uinput_fd, EV_ABS, ABS_MT_TRACKING_ID, 1);
#endif
			send_uevent(uinput_fd, EV_ABS, ABS_MT_TOUCH_MAJOR, 0);
			send_uevent(uinput_fd, EV_SYN, SYN_MT_REPORT, 0);
#endif

			send_uevent(uinput_fd, EV_SYN, SYN_REPORT, 0);

			FD_ZERO(&fdset);
			FD_SET(uart_fd, &fdset);

			/* Now enter indefinite sleep iuntil input appears */
			select(uart_fd+1, &fdset, NULL, NULL, NULL);
			/* In case we were wrongly woken up check the event
			 * count again */
			continue;
		}
			
		nbytes = read(uart_fd, recv_buf, RECV_BUF_SIZE);
		
		if (nbytes <= 0)
			continue;

	/*	printf("Received %d bytes\n", nbytes);
		
		for(i=0; i < nbytes; i++)
			printf("%2.2X ",recv_buf[i]);
		printf("\n");	*/	

		snarf2(recv_buf,nbytes);
	}

	/* never reached? */
	return 0;
}