LXR linux/tools/testing/selftests/media_tests/media_device

   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@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
  37int main(int argc, char **argv)
  38{
  39        int opt;
  40        char media_device[256];
  41        int count = 0;
  42        struct media_device_info mdi;
  43        int ret;
  44        int fd;
  45
  46        if (argc < 2) {
  47                printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
  48                exit(-1);
  49        }
  50
  51        /* Process arguments */
  52        while ((opt = getopt(argc, argv, "d:")) != -1) {
  53                switch (opt) {
  54                case 'd':
  55                        strncpy(media_device, optarg, sizeof(media_device) - 1);
  56                        media_device[sizeof(media_device)-1] = '\0';
  57                        break;
  58                default:
  59                        printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
  60                        exit(-1);
  61                }
  62        }
  63
  64        if (getuid() != 0) {
  65                printf("Please run the test as root - Exiting.\n");
  66                exit(-1);
  67        }
  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