1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #include <sys/mman.h> 17 #include <fcntl.h> 18 //#include <pthread.h> 19 #include <sys/prctl.h> 20 #include <unistd.h> 21 #include <stdbool.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <string.h> 25 #include <asm-generic/ioctl.h> 26 #include "mtkfb.h" 27 int main(int argc, char **argv) { 28 int fd = 0; 29 struct fb_overlay_layer layerInfo; 30 memset(&layerInfo, 0, sizeof(layerInfo)); 31 fd = open("/dev/graphics/fb0", O_RDWR); 32 if (fd < 0) { 33 perror("open /dev/graphics/fb0"); 34 exit(-1); 35 } 36 printf("Device file opened successfully\n"); 37 printf("Trying to get layer info\n"); 38 if(ioctl(fd, MTKFB_GET_OVERLAY_LAYER_INFO, &layerInfo) == -1) { 39 perror("ioctl MTKFB_GET_OVERLAY_LAYER_INFO failed"); 40 exit(-2); 41 } 42 printf("Got layer info\n"); 43 printf("Trying to set layer info\n"); 44 // set any huge value here 45 int curr_val = 0xf1111111; 46 while(1) { 47 layerInfo.layer_id = curr_val; 48 if(ioctl(fd, MTKFB_SET_OVERLAY_LAYER, &layerInfo) == -1) { 49 perror("ioctl MTKFB_SET_OVERLAY_LAYER failed"); 50 //exit(-2); 51 } 52 curr_val--; 53 if(curr_val == -1) { 54 break; 55 } 56 } 57 printf("Set layer info\n"); 58 return 0; 59 } 60
