Created
March 14, 2018 19:46
-
-
Save NotKit/7d233dd21ff1c4f34947d6a56ace3ce0 to your computer and use it in GitHub Desktop.
Small tool to activate framebuffer output on Droid 4 with Android kernel
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <stdio.h> | |
#include <stdlib.h> | |
#include <fcntl.h> | |
#include <sys/resource.h> | |
#include <linux/fb.h> | |
#include <assert.h> | |
#include <string.h> | |
#include <sys/ioctl.h> | |
#include <unistd.h> | |
static struct fb_var_screeninfo vi; | |
static void print_fb_var_screeninfo() | |
{ | |
printf("vi.xres: %d\n", vi.xres); | |
printf("vi.yres: %d\n", vi.yres); | |
printf("vi.xres_virtual: %d\n", vi.xres_virtual); | |
printf("vi.yres_virtual: %d\n", vi.yres_virtual); | |
printf("vi.xoffset: %d\n", vi.xoffset); | |
printf("vi.yoffset: %d\n", vi.yoffset); | |
printf("vi.bits_per_pixel: %d\n", vi.bits_per_pixel); | |
printf("vi.grayscale: %d\n", vi.grayscale); | |
printf("vi.activate: %d\n", vi.activate); | |
} | |
int main(int argc, char *argv[]) | |
{ | |
int fd = open("/dev/fb0", O_RDWR); | |
if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) { | |
printf("failed to get fb0 var info\n"); | |
close(fd); | |
return -1; | |
} | |
print_fb_var_screeninfo(); | |
vi.activate = FB_ACTIVATE_NOW | FB_ACTIVATE_FORCE; | |
if (ioctl(fd, FBIOPUT_VSCREENINFO, &vi) < 0) { | |
printf("failed to put fb0 var info\n"); | |
close(fd); | |
return -1; | |
} | |
close(fd); | |
return 0; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment