1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * media_device_open.c - Media Controller Device Open Test 5 * 6 * Copyright (c) 2016 Shuah Khan <shuahkh (at) osg.samsung.com> 7 * Copyright (c) 2016 Samsung Electronics Co., Ltd. 8 * 9 */ 10 11 /* 12 * This file adds a test for Media Controller API. 13 * This test should be run as root and should not be 14 * included in the Kselftest run. This test should be 15 * run when hardware and driver that makes use Media 16 * Controller API are present in the system. 17 * 18 * This test opens user specified Media Device and calls 19 * MEDIA_IOC_DEVICE_INFO ioctl, closes the file, and exits. 20 * 21 * Usage: 22 * sudo ./media_device_open -d /dev/mediaX 23 * 24 * Run this test is a loop and run bind/unbind on the driver. 25 */ 26 27 #include <stdio.h> 28 #include <unistd.h> 29 #include <stdlib.h> 30 #include <errno.h> 31 #include <string.h> 32 #include <fcntl.h> 33 #include <sys/ioctl.h> 34 #include <sys/stat.h> 35 #include <linux/media.h> 36 37 #include "../kselftest.h" 38 39 int main(int argc, char **argv) 40 { 41 int opt; 42 char media_device[256]; 43 int count = 0; 44 struct media_device_info mdi; 45 int ret; 46 int fd; 47 48 if (argc < 2) { 49 printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]); 50 exit(-1); 51 } 52 53 /* Process arguments */ 54 while ((opt = getopt(argc, argv, "d:")) != -1) { 55 switch (opt) { 56 case 'd': 57 strncpy(media_device, optarg, sizeof(media_device) - 1); 58 media_device[sizeof(media_device)-1] = '\0'; 59 break; 60 default: 61 printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]); 62 exit(-1); 63 } 64 } 65 66 if (getuid() != 0) 67 ksft_exit_skip("Please run the test as root - Exiting.\n"); 68 69 /* Open Media device and keep it open */ 70 fd = open(media_device, O_RDWR); 71 if (fd == -1) { 72 printf("Media Device open errno %s\n", strerror(errno)); 73 exit(-1); 74 } 75 76 ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi); 77 if (ret < 0) 78 printf("Media Device Info errno %s\n", strerror(errno)); 79 else 80 printf("Media device model %s driver %s\n", 81 mdi.model, mdi.driver); 82 } 83
