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
39int 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}
83