backlight_ctl.zip_Backlight_backlight_ctl_tiny6410

/* ****************************************** * File name: backlight_ctl.c * Function: 控制tiny6410背光亮度 * Description: 应用驱动提供的接口控制背光的亮度 * Author & Date: Joshua Chan, 2011/12/31 * ******************************************/ #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include "backlight_ctl.h" static int fd_backlight_1wire; int set_backlight_brightness(unsigned bright) { if (!fd_backlight_1wire) { fd_backlight_1wire = open(BACKLIGHT_PATH, O_WRONLY); if (fd_backlight_1wire < 0) { perror("open backlight device:"); return -1; } } char buf[4] = {0, 0, 0, 0}; sprintf(buf, "%u", bright); int ret = write(fd_backlight_1wire, buf, sizeof(buf)); return ret; }