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fops_probe utility helps to understand what file_operations callbacks are attached to a particular file. Requries KCOV and KALLSYMS. Build with: g++ tools/fops_probe/fops_probe.cc -Wall -static -o fops_probe Then copy the binary to target machine and run as: ./fops_probe /dev/fb0 You should see output similar to: ffffffff81bcccb9 vfs_read ................ ffffffff83af85c3 fb_read ffffffff83b52af5 cirrusfb_sync ffffffff81bcd219 vfs_write ................ ffffffff83af7fe2 fb_write ffffffff83b52af5 cirrusfb_sync ffffffff81c1b745 do_vfs_ioctl ffffffff83af7ea9 fb_ioctl ffffffff81a4ea44 do_mmap ................ ffffffff83af716c fb_mmap which allows to understand what callbacks are associated with /dev/fb0.