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#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <errno.h>
#include <linux/fb.h>
int rotatefb_main(int argc, char *argv[])
{
int c;
char *fbdev = "/dev/graphics/fb0";
int rotation = 0;
int fd;
int res;
struct fb_var_screeninfo fbinfo;
do {
c = getopt(argc, argv, "d:");
if (c == EOF)
break;
switch (c) {
case 'd':
fbdev = optarg;
break;
case '?':
fprintf(stderr, "%s: invalid option -%c\n",
argv[0], optopt);
exit(1);
}
} while (1);
if(optind + 1 != argc) {
fprintf(stderr, "%s: specify rotation\n", argv[0]);
exit(1);
}
rotation = atoi(argv[optind]);
fd = open(fbdev, O_RDWR);
if(fd < 0) {
fprintf(stderr, "cannot open %s\n", fbdev);
return 1;
}
res = ioctl(fd, FBIOGET_VSCREENINFO, &fbinfo);
if(res < 0) {
fprintf(stderr, "failed to get fbinfo: %s\n", strerror(errno));
return 1;
}
if((fbinfo.rotate ^ rotation) & 1) {
unsigned int xres = fbinfo.yres;
fbinfo.yres = fbinfo.xres;
fbinfo.xres = xres;
fbinfo.xres_virtual = fbinfo.xres;
fbinfo.yres_virtual = fbinfo.yres * 2;
if(fbinfo.yoffset == xres)
fbinfo.yoffset = fbinfo.yres;
}
fbinfo.rotate = rotation;
res = ioctl(fd, FBIOPUT_VSCREENINFO, &fbinfo);
if(res < 0) {
fprintf(stderr, "failed to set fbinfo: %s\n", strerror(errno));
return 1;
}
return 0;
}
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