#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <asm/arch/mxcfb.h>

int main(int argc, char **argv)
{
             struct mxcfb_gbl_alpha alpha;
             int fbdev_fd;

             if (argc != 2){
                      printf("Usage: %s alpha <0-255>\n", argv[0]);
                      printf("\t0 = fully opaque\n");
                      return -1;
             }

             fbdev_fd = open("/dev/fb1", O_RDWR, 0);

             alpha.enable = 1;
             alpha.alpha = atoi(argv[1]);
             ioctl(fbdev_fd, MXCFB_SET_GBL_ALPHA, &alpha);
             close(fbdev_fd);
             return 0;
}

recipe:
DESCRIPTION = "Application to send alpha ioctl to overlay fb"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"

SRC_URI = "file://fbalpha.c"

do_compile() {
        echo "${CC} -I ${STAGING_KERNEL_DIR}/include/linux ../fbalpha.c -o fbalpha"
        #${CC} -L ${STAGING_KERNEL_DIR} -L ${STAGING_KERNEL_DIR}/include/linux -I ${STAGING_KERNEL_DIR}/include/uapi/linux ../fbalpha.c -o fbalpha
        ${CC} -I${STAGING_KERNEL_DIR}/include  ../fbalpha.c -o fbalpha
}

do_install() {
        install -d ${D}${bindir}
        install -m 0755 fbalpha ${D}${bindir}
}

output:
| arm-poky-linux-gnueabi-gcc  -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 --sysroot=/home/bodangly/devel/client.gstreamer-imx/client_brd/tmp/sysroots/edm1-cf-imx6 -I /home/bodangly/devel/client.gstreamer-imx/client_brd/tmp/work-shared/edm1-cf-imx6/kernel-source/include/linux ../fbalpha.c -o fbalpha
| ../fbalpha.c:8:30: fatal error: asm/arch/mxcfb.h: No such file or directory
| compilation terminated.
| WARNING: exit code 1 from a shell command.