osk_mouse.c

/*
 * osk_mouse.c : framebuffer on-screen keyboard. Mouse or trackball version
 * 
 * Copyright (C) 2014 Rafael Ignacio Zurita <rafaelignacio.zurita@gmail.com>
 *
 * Based on : http://thiemonge.org/getting-started-with-uinput
 * and www.cubieforums.com/index.php?topic=33.0
 * and fb_drawimage() from https://svn.mcs.anl.gov/repos/ZeptoOS/trunk/BGP/packages/busybox/src/miscutils/fbsplash.c 
 *
 *   osk_mouse.c 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.
 *
 *    You should have received a copy of the GNU Library General Public
 *    License along with this software (check COPYING); if not, write to the Free
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */



#include <fcntl.h>
#include <linux/fb.h>
#include <linux/input.h>
#include <linux/ioctl.h>
#include <linux/uinput.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/select.h>
#include <sys/time.h>
#include <termios.h>
#include <unistd.h>

#define MOUSEFILE "/dev/input/mouse0"

#define UMBRAL 10



unsigned char abc[] = {KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6, KEY_7, KEY_8, KEY_9, KEY_0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_U, KEY_I, KEY_O, KEY_P, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_J, KEY_K, KEY_L, KEY_ENTER, KEY_Z, KEY_X, KEY_C, KEY_V, KEY_B, KEY_N, KEY_M, KEY_COMMA, KEY_DOT, KEY_ENTER, 0, KEY_SPACE, KEY_SPACE, KEY_SPACE, KEY_COMMA, KEY_DOT, KEY_DOT, KEY_DOT, KEY_DOT, KEY_BACKSPACE};




/*
 *	Draw image from PPM file
 */
static void fb_drawimage(const char *filename, char *fbp, int xo, int yo, int bpp, int length, int xres, unsigned *img_height, unsigned *img_width) {

	char head[256];
	char s[80];
	FILE *theme_file;
	unsigned char *pixline;
	unsigned i, j, line_size;

	memset(head, 0, sizeof(head));
	theme_file = fopen(filename, "r");

	/* parse ppm header */
	while (1) {
		if (fgets(s, sizeof(s), theme_file) == NULL) {
			printf("bad PPM file '%s'", filename);
			exit(1);
		}

		if (s[0] == '#')
			continue;

		if (strlen(head) + strlen(s) >= sizeof(head)) {
			printf("bad PPM file '%s'", filename);
			exit(1);
		}

		strcat(head, s);
		if (head[0] != 'P' || head[1] != '6') {
			printf("bad PPM file '%s'", filename);
			exit(1);
		}

		/* width, height, max_color_val */
		if (sscanf(head, "P6 %u %u %u", img_width, img_height, &i) == 3)
			break;
		/* TODO: i must be <= 255! */
	}

	line_size = *img_width*3;

	long int location = 0;
	pixline = malloc(line_size);
	for (j = 0; j < *img_height; j++) {
		unsigned char *pixel = pixline;

		if (fread(pixline, 1, line_size, theme_file) != line_size) {
			printf("bad PPM file '%s'", filename);
			exit(1);
		}

		for (i = 0; i < *img_width; i++) {
			pixel += 3;
			location = ((xres - *img_width)+i+xo) * (bpp/8) + (j+yo) * length;

			*(fbp + location) = (((unsigned)pixel[0]));
			*(fbp + location + 1) = (((unsigned)pixel[1]));
			*(fbp + location + 2) = (((unsigned)pixel[2]));
			*(fbp + location + 3) = -1;      /* No transparency */
		}
	}
	free(pixline);
	fclose(theme_file);
}



int send_event(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;

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

    return 0;
}

static void fb_drawbox(char *fbp, int x1, int y1, int x2, int y2, int bpp, int length)
{
	int x, y;
	long int location = 0;

     		for (y = y1; y < y2; y++)
       		for (x = x1; x < x2; x++) {

			location = (x) * (bpp/8) + (y) * length;

			*(fbp + location) = 100;
			*(fbp + location + 1) = 100;
			*(fbp + location + 2) = 200;
			*(fbp + location + 3) = -1;      /* No transparency */

			}

}


int main(void) {

     int fbfd = 0;
     struct fb_var_screeninfo vinfo;
     struct fb_fix_screeninfo finfo;
     long int screensize = 0;
     char *fbp = 0;
     /* img dimensions set in fb_drawimage */
     unsigned img_height = 0;
     unsigned img_width = 0;

	/* uinput init */
	int i,fd;
	struct uinput_user_dev device;
	memset(&device, 0, sizeof device);

	fd=open("/dev/uinput",O_WRONLY);
	strcpy(device.name,"test keyboard");

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

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

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

	for (i=0;i<50;i++)
		if (ioctl(fd,UI_SET_KEYBIT, abc[i]) < 0)
			fprintf(stderr, "error evbit key\n");

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

	for(i=REL_X;i<REL_MAX;i++)
		if (ioctl(fd,UI_SET_RELBIT,i) < 0)
			fprintf(stderr, "error setrelbit %d\n", i);

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

	sleep(2);
	/* end uinput init */


	/* init framebuffer */
	/* Open the file for reading and writing */
	fbfd = open("/dev/fb0", O_RDWR);
	if (fbfd == -1) {
		perror("Error: cannot open framebuffer device");
		exit(1);
	}
	printf("The framebuffer device was opened successfully.\n");

	/* Get fixed screen information */
	if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
		perror("Error reading fixed information");
		exit(2);
	}

	/* Get variable screen information */
	if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
		perror("Error reading variable information");
		exit(3);
	}

	printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);

	/* Figure out the size of the screen in bytes */
	screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;

	/* Map the device to memory */
	fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,
                        fbfd, 0);
	if ((int)fbp == -1) {
		perror("Error: failed to map framebuffer device to memory");
		exit(4);
	}
	printf("The framebuffer device was mapped to memory successfully.\n");

	/* end init framebuffer */



	/* init mouse */
	int fdm;
	struct input_event evm;

	if ((fdm = open(MOUSEFILE, O_RDONLY | O_NONBLOCK)) == -1) {
		printf("Device open ERROR\n");
		exit(EXIT_FAILURE);
	}

	int ret, xp=0, yp=0, rkp=0, ckp=0;
	unsigned char button,bLeft,bMiddle,bRight;
	char xm,ym;
	int absolute_x,absolute_y;
	/* end init mouse */

	int pressed=0;
	int pressedk=0;

	int j;

	while(1) {

		fb_drawimage("image_mouse.ppm", fbp, vinfo.xoffset, vinfo.yoffset, vinfo.bits_per_pixel, finfo.line_length, vinfo.xres, &img_height, &img_width);


		/* check mouse */

 		ret=read(fdm, &evm, sizeof(struct input_event));
		if (ret!=-1) {
			unsigned char *ptr = (unsigned char*)&evm;

			button=ptr[0];
			bLeft = button & 0x1;
			bMiddle = ( button & 0x4 ) > 0;
			bRight = ( button & 0x2 ) > 0;
			xm=(char) ptr[1];ym=(char) ptr[2];


			if (xm>0) xp++;
			else if(xm<0) xp--;

			if (ym>0) yp--;
			else if(ym<0) yp++;

			if (xp==UMBRAL) {
				xp=0;
				ckp++; if (ckp>9) ckp=9;
			} else if (xp==-UMBRAL) {
				xp=0;
				ckp--; if (ckp<0) ckp=0;
			}

			if (yp==UMBRAL) {
				yp=0;
				rkp++; if (rkp>4) rkp=4;
			} else if (yp==-UMBRAL) {
				yp=0;
				rkp--; if (rkp<0) rkp=0;
			}


			absolute_x+=xm;
			absolute_y-=ym;
	
			if (bLeft==1) {
				pressed=1;
				pressedk=(rkp*10)+ckp;
			} else if ((bLeft==0) && (pressed==1)) {

				if (abc[pressedk] == 0) break;
				pressed=0;
				send_event(fd, EV_KEY, abc[pressedk], 1);
				send_event(fd, EV_SYN, SYN_REPORT, 0);
				send_event(fd, EV_KEY, abc[pressedk], 0);
				send_event(fd, EV_SYN, SYN_REPORT, 0);
			}

		}


		/* the whole mess to draw the pointer/cursor */
		int x1, x2, y1, y2;
		int anchoi = img_width;	/* width of keyboard image */
		int altoi = img_height;	/* height of keyboard image */
		int nro_columnas=10;
		int nro_filas=5;

		x1=(vinfo.xres-anchoi)+((anchoi/nro_columnas)*(ckp));
		x2=x1+(anchoi/nro_columnas);
		y1=(altoi/nro_filas)*(rkp);
		y2=y1+4;

		fb_drawbox(fbp, x1, y1, x2, y2, vinfo.bits_per_pixel, finfo.line_length);

		y1=(altoi/nro_filas)*(rkp)+(altoi/nro_filas-4); // The "4" here is a ugly hardcoded number of pixels less
		y2=y1+4;		/* 4 is the height of the line */

		fb_drawbox(fbp, x1, y1, x2, y2, vinfo.bits_per_pixel, finfo.line_length);

		usleep(1000);

	}

	close(fd);
	close(fdm);

	munmap(fbp, screensize);
	close(fbfd);

	return 0;
}