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

   1/*
   2 * media_device_open.c - Media Controller Device Open Test
   3 *
   4 * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>
   5 * Copyright (c) 2016 Samsung Electronics Co., Ltd.
   6 *
   7 * This file is released under the GPLv2.
   8 */
   9
  10/*
  11 * This file adds a test for Media Controller API.
  12 * This test should be run as root and should not be
  13 * included in the Kselftest run. This test should be
  14 * run when hardware and driver that makes use Media
  15 * Controller API are present in the system.
  16 *
  17 * This test opens user specified Media Device and calls
  18 * MEDIA_IOC_DEVICE_INFO ioctl, closes the file, and exits.
  19 *
  20 * Usage:
  21 *      sudo ./media_device_open -d /dev/mediaX
  22 *
  23 *      Run this test is a loop and run bind/unbind on the driver.
  24*/
  25
  26#include <stdio.h>
  27#include <unistd.h>
  28#include <stdlib.h>
  29#include <errno.h>
  30#include <string.h>
  31#include <fcntl.h>
  32#include <sys/ioctl.h>
  33#include <sys/stat.h>
  34#include <linux/media.h>
  35
  36int main(int argc, char **argv)
  37{
  38        int opt;
  39        char media_device[256];
  40        int count = 0;
  41        struct media_device_info mdi;
  42        int ret;
  43        int fd;
  44
  45        if (argc < 2) {
  46                printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
  47                exit(-1);
  48        }
  49
  50        /* Process arguments */
  51        while ((opt = getopt(argc, argv, "d:")) != -1) {
  52                switch (opt) {
  53                case 'd':
  54                        strncpy(media_device, optarg, sizeof(media_device) - 1);
  55                        media_device[sizeof(media_device)-1] = '\0';
  56                        break;
  57                default:
  58                        printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
  59                        exit(-1);
  60                }
  61        }
  62
  63        if (getuid() != 0) {
  64                printf("Please run the test as root - Exiting.\n");
  65                exit(-1);
  66        }
  67
  68        /* Open Media device and keep it open */
  69        fd = open(media_device, O_RDWR);
  70        if (fd == -1) {
  71                printf("Media Device open errno %s\n", strerror(errno));
  72                exit(-1);
  73        }
  74
  75        ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi);
  76        if (ret < 0)
  77                printf("Media Device Info errno %s\n", strerror(errno));
  78        else
  79                printf("Media device model %s driver %s\n",
  80                        mdi.model, mdi.driver);
  81}
  82