tools/testing/selftests/media_tests/media_device_open.c

   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
  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 }