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      1 /*
      2  * media_device_open.c - Media Controller Device Open Test
      3  *
      4  * Copyright (c) 2016 Shuah Khan <shuahkh (at) 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 }
     82