// SPDX-License-Identifier: GPL-2.0 /* * media_device_open.c - Media Controller Device Open Test * * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com> * Copyright (c) 2016 Samsung Electronics Co., Ltd. * */ /* * This file adds a test for Media Controller API. * This test should be run as root and should not be * included in the Kselftest run. This test should be * run when hardware and driver that makes use Media * Controller API are present in the system. * * This test opens user specified Media Device and calls * MEDIA_IOC_DEVICE_INFO ioctl, closes the file, and exits. * * Usage: * sudo ./media_device_open -d /dev/mediaX * * Run this test is a loop and run bind/unbind on the driver. */ #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <fcntl.h> #include <sys/ioctl.h> #include <sys/stat.h> #include <linux/media.h> #include "../kselftest.h" int main(int argc, char **argv) { int opt; char media_device[256]; int count = 0; struct media_device_info mdi; int ret; int fd; if (argc < 2) { printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]); exit(-1); } /* Process arguments */ while ((opt = getopt(argc, argv, "d:")) != -1) { switch (opt) { case 'd': strncpy(media_device, optarg, sizeof(media_device) - 1); media_device[sizeof(media_device)-1] = '\0'; break; default: printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]); exit(-1); } } if (getuid() != 0) ksft_exit_skip("Please run the test as root - Exiting.\n"); /* Open Media device and keep it open */ fd = open(media_device, O_RDWR); if (fd == -1) { printf("Media Device open errno %s\n", strerror(errno)); exit(-1); } ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi); if (ret < 0) printf("Media Device Info errno %s\n", strerror(errno)); else printf("Media device model %s driver %s\n", mdi.model, mdi.driver); }