/* * Touch screen driver for ucb1100, ucb1200 and ucb1300 based systems. * * Copyright (c) 2000 Century Software Embedded Technologies * Copyright (c) 2002 Alex Holden <alex@alexholden.net> * * Requires /dev/ucb1x00-ts (c 10 14). */#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <errno.h>#include <fcntl.h>#include <math.h>#include <signal.h>#include <sys/time.h>#include <sys/ioctl.h>#include "device.h"/* file descriptor for touch panel */static int pd_fd = -1;/* Set this for the appropriate filename */#define DEVICE "/dev/ucb1x00-ts"/* This is used to set the default calibration settings,   for ease of use.  Most often this will be off, so people    should calculate their own */static MWTRANSFORM default_transform = {	-46141, 0, 44157853, 0, -35869, 33645300, 65536};extern SCREENDEVICE scrdev;struct ts_event {	unsigned short	pressure;	unsigned short	x;	unsigned short	y;	unsigned short	pad;	struct timeval	stamp;};static intPD_Open(MOUSEDEVICE * pmd){	/*	 * open up the touch-panel device.	 * Return the fd if successful, or negative if unsuccessful.	 */	if ((pd_fd = open(DEVICE, O_NONBLOCK)) < 0) {		EPRINTF("Error %d opening touch panel\n", errno);		return -1;	}	/* This is the default transform for this device */	/* We set it here, so that the system will come up normally */	GdSetTransform(&default_transform);	/* This should normally be disabled, but we leave it on for debugging */	/*GdHideCursor(&scrdev);*/	return pd_fd;}static voidPD_Close(void){	/* Close the touch panel device. */	if (pd_fd < 0)		return;	close(pd_fd);	pd_fd = -1;}static intPD_GetButtonInfo(void){	/* get "mouse" buttons supported */	return MWBUTTON_L;}static voidPD_GetDefaultAccel(int *pscale, int *pthresh){	*pscale = 3;	*pthresh = 5;}static intPD_Read(MWCOORD * px, MWCOORD * py, MWCOORD * pz, int *pb, int mode){	/* read a data point */	struct ts_event event;	int bytes_read;	bytes_read = read(pd_fd, &event, sizeof(event));	if (bytes_read != sizeof(event)) {		if (bytes_read == -1) {			if (errno == EINTR || errno == EAGAIN)				return 0;			EPRINTF("Error %d reading from touch panel\n", errno);			return -1;		}		EPRINTF("Wrong number of bytes %d read from touch panel "			"(expected %d)\n", bytes_read, sizeof(event));		return 0;	}	*px = event.x;	*py = event.y;	*pz = event.pressure;	*pb = (event.pressure > 50) ? MWBUTTON_L : 0;	if (!*pb)		return 3;	return 2;}MOUSEDEVICE mousedev = {	PD_Open,	PD_Close,	PD_GetButtonInfo,	PD_GetDefaultAccel,	PD_Read,	NULL,	MOUSE_TRANSFORM		/* flags*/};