tools/testing/selftests/media_tests/media_device_open.c

   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
  36 int 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 }