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1// SPDX-License-Identifier: GPL-2.02 3/*4 * media_device_open.c - Media Controller Device Open Test5 *6 * Copyright (c) 2016 Shuah Khan <shuahkh@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 be14 * included in the Kselftest run. This test should be15 * run when hardware and driver that makes use Media16 * Controller API are present in the system.17 *18 * This test opens user specified Media Device and calls19 * MEDIA_IOC_DEVICE_INFO ioctl, closes the file, and exits.20 *21 * Usage:22 * sudo ./media_device_open -d /dev/mediaX23 *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 39int 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 else80 printf("Media device model %s driver %s\n",81 mdi.model, mdi.driver);82}83