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 int main(int argc, char **argv)
38 {
39 	int opt;
40 	char media_device[256];
41 	int count = 0;
42 	struct media_device_info mdi;
43 	int ret;
44 	int fd;
45 
46 	if (argc < 2) {
47 		printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
48 		exit(-1);
49 	}
50 
51 	/* Process arguments */
52 	while ((opt = getopt(argc, argv, "d:")) != -1) {
53 		switch (opt) {
54 		case 'd':
55 			strncpy(media_device, optarg, sizeof(media_device) - 1);
56 			media_device[sizeof(media_device)-1] = '\0';
57 			break;
58 		default:
59 			printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
60 			exit(-1);
61 		}
62 	}
63 
64 	if (getuid() != 0) {
65 		printf("Please run the test as root - Exiting.\n");
66 		exit(-1);
67 	}
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