look ma no hands (and cables)

send_event.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/input.h>
#include <errno.h>
#include <time.h>

//adb shell getevent -pl
#define INPUT_DEV_PATH "/dev/input/event4"

#define ABS_MT_SLOT             0x2f    /* MT slot being modified */
#define ABS_MT_TOUCH_MAJOR      0x30    /* Major axis of touching ellipse */
#define ABS_MT_TOUCH_MINOR      0x31    /* Minor axis (omit if circular) */
#define ABS_MT_WIDTH_MAJOR      0x32    /* Major axis of approaching ellipse */
#define ABS_MT_WIDTH_MINOR      0x33    /* Minor axis (omit if circular) */
#define ABS_MT_ORIENTATION      0x34    /* Ellipse orientation */
#define ABS_MT_POSITION_X       0x35    /* Center X touch position */
#define ABS_MT_POSITION_Y       0x36    /* Center Y touch position */
#define ABS_MT_TOOL_TYPE        0x37    /* Type of touching device */
#define ABS_MT_BLOB_ID          0x38    /* Group a set of packets as a blob */
#define ABS_MT_TRACKING_ID      0x39    /* Unique ID of initiated contact */
#define ABS_MT_PRESSURE         0x3a    /* Pressure on contact area */
#define ABS_MT_DISTANCE         0x3b    /* Contact hover distance */
#define ABS_MT_TOOL_X           0x3c    /* Center X tool position */
#define ABS_MT_TOOL_Y           0x3d    /* Center Y tool position */

static struct input_event syn_report;

inline void send_syn_report(int fd){
	write(fd, &syn_report, sizeof(syn_report));
}


inline long nanoseconds_to_milliseconds(long secs)
{
	return secs/1000000;
}

static struct timespec t_time_now;
inline long get_now(){
	clock_gettime(CLOCK_MONOTONIC, &t_time_now);
	return t_time_now.tv_sec*1000 + nanoseconds_to_milliseconds(t_time_now.tv_nsec);
}

inline int lerp(int a, int b, float alpha){
	return (b-a) * alpha + a;
}



static void send_swipe(int fd, int x1, int y1, int x2, int y2){

	struct input_event event;
	long time_start;
	long time_now;
	long duration = 300;
	
	memset(&event, 0, sizeof(event));

	event.type  = EV_ABS;
	
	event.code  = ABS_MT_SLOT;
	event.value = 0;
	write(fd, &event, sizeof(event));

	event.code  = ABS_MT_TRACKING_ID;
	event.value = 5959;
	write(fd, &event, sizeof(event));

	event.code  = ABS_MT_TOUCH_MAJOR; 
	event.value = 60; 
	write(fd, &event, sizeof(event));

	event.code  = ABS_MT_WIDTH_MAJOR; 
	event.value = 20;
	write(fd, &event, sizeof(event));

	event.code  = ABS_MT_PRESSURE;
	event.value = 20;
	write(fd, &event, sizeof(event));

	event.code  = ABS_MT_POSITION_X;
	event.value = x1;
	write(fd, &event, sizeof(event));

	event.code  = ABS_MT_POSITION_Y;
	event.value = y1;
	write(fd, &event, sizeof(event));

	send_syn_report(fd);

	time_now = time_start = get_now();	
	long time_end = time_start + duration;
	while (time_now < time_end) {
		long time_elapsed = time_now - time_start;
		float alpha = (float) time_elapsed / duration;
	
		event.code  = ABS_MT_POSITION_X;
		event.value = lerp(x1, x2, alpha);
		write(fd, &event, sizeof(event));
		
		event.code  = ABS_MT_POSITION_Y;
		event.value = lerp(y1, y2, alpha);
		write(fd, &event, sizeof(event));
		
		send_syn_report(fd);
		
		time_now = get_now();
	}

	event.code  = ABS_MT_TRACKING_ID;
	event.value = -1;
	write(fd, &event, sizeof(event));
	send_syn_report(fd);
}



//ABS_MT_POSITION_X     : value 0, min 0, max 1088, fuzz 0, flat 0, resolution 0
//ABS_MT_POSITION_Y     : value 0, min 0, max 1770, 
	
inline void swipe_r(int fd){
	send_swipe(fd, 544, 885, 544+300, 885); 
}

inline void swipe_l(int fd){
	send_swipe(fd, 544, 885, 544-300, 885); 
}
inline void swipe_u(int fd){
	send_swipe(fd, 544, 885, 544, 885-300); 
}
inline void swipe_d(int fd){
	send_swipe(fd, 544, 885, 544, 885+300); 
}

int main()
{
	int fd;
	int version;
	struct input_event event;

	syn_report.type = EV_SYN;
	syn_report.code = SYN_REPORT;
	syn_report.value = 0;

	fd = open(INPUT_DEV_PATH, O_RDWR);

	memset(&event, 0, sizeof(event));


	int d;
	int c = 50;
	while(c-- > 0){
		d = rand() % 4;
		switch(d){
			case 0:
				swipe_d(fd);
				break;
			case 1:
				swipe_l(fd);
				break;
			case 2:
				swipe_r(fd);
				break;
			case 3:
				swipe_u(fd);
				break;
		}
		usleep(500000);
	}

	rand();
	close(fd);

}