1 #include <ctype.h> 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include <sys/mman.h> 5 #include <fcntl.h> 6 #include <string.h> 7 #include <termios.h> 8 #include <unistd.h> 9 #include <errno.h> 10 #include <linux/fb.h> 11 12 13 int rotatefb_main(int argc, char *argv[]) 14 { 15 int c; 16 char *fbdev = "/dev/graphics/fb0"; 17 int rotation = 0; 18 int fd; 19 int res; 20 struct fb_var_screeninfo fbinfo; 21 22 do { 23 c = getopt(argc, argv, "d:"); 24 if (c == EOF) 25 break; 26 switch (c) { 27 case 'd': 28 fbdev = optarg; 29 break; 30 case '?': 31 fprintf(stderr, "%s: invalid option -%c\n", 32 argv[0], optopt); 33 exit(1); 34 } 35 } while (1); 36 37 if(optind + 1 != argc) { 38 fprintf(stderr, "%s: specify rotation\n", argv[0]); 39 exit(1); 40 } 41 rotation = atoi(argv[optind]); 42 43 fd = open(fbdev, O_RDWR); 44 if(fd < 0) { 45 fprintf(stderr, "cannot open %s\n", fbdev); 46 return 1; 47 } 48 49 res = ioctl(fd, FBIOGET_VSCREENINFO, &fbinfo); 50 if(res < 0) { 51 fprintf(stderr, "failed to get fbinfo: %s\n", strerror(errno)); 52 return 1; 53 } 54 if((fbinfo.rotate ^ rotation) & 1) { 55 unsigned int xres = fbinfo.yres; 56 fbinfo.yres = fbinfo.xres; 57 fbinfo.xres = xres; 58 fbinfo.xres_virtual = fbinfo.xres; 59 fbinfo.yres_virtual = fbinfo.yres * 2; 60 if(fbinfo.yoffset == xres) 61 fbinfo.yoffset = fbinfo.yres; 62 } 63 fbinfo.rotate = rotation; 64 res = ioctl(fd, FBIOPUT_VSCREENINFO, &fbinfo); 65 if(res < 0) { 66 fprintf(stderr, "failed to set fbinfo: %s\n", strerror(errno)); 67 return 1; 68 } 69 70 return 0; 71 } 72
