#define SYSFS_PATH "/sys/class/"
#define MAX_BUF 64
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>


int sysfs_read(char* path, char* filename)
{
  FILE* fd;
  char buf[MAX_BUF];
  int i;
  int value;
  snprintf(buf, sizeof(buf),"%s%s",path,filename);
  fd=fopen(buf,"r");
  fscanf(fd,"%d",&value);
  printf("%d",value);
  fclose(fd);
  return value;
}

int sysfs_write(char* path, char* filename,int value)
{
  FILE* fd;
  char buf[MAX_BUF];
  int i;
  int value;
  snprintf(buf, sizeof(buf),"%s%s",path,filename);
  fd=fopen(buf,"w");
  fprintf(fd,"%d",value);
  printf("%d",value);
  fclose(fd);

}

void main()
{
  char ch[MAX_BUF];
  int i;
  sysfs_read("/sys/class/leds/mmc0\::/","max_brightness");

}