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 }