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1// SPDX-License-Identifier: GPL-2.02 3/*4 * video_device_test - Video Device Test5 *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 Video Device. This test should not be included13 * in the Kselftest run. This test should be run when hardware and driver14 * that makes use of V4L2 API is present.15 *16 * This test opens user specified Video Device and calls video ioctls in a17 * loop once every 10 seconds.18 *19 * Usage:20 * sudo ./video_device_test -d /dev/videoX21 *22 * While test is running, remove the device or unbind the driver and23 * ensure there are no use after free errors and other Oops in the24 * dmesg.25 * When possible, enable KaSan kernel config option for use-after-free26 * error detection.27*/28 29#include <stdio.h>30#include <unistd.h>31#include <stdlib.h>32#include <errno.h>33#include <string.h>34#include <fcntl.h>35#include <sys/ioctl.h>36#include <sys/stat.h>37#include <time.h>38#include <linux/videodev2.h>39 40#define PRIORITY_MAX 441 42int priority_test(int fd)43{44 /* This test will try to update the priority associated with a file descriptor */45 46 enum v4l2_priority old_priority, new_priority, priority_to_compare;47 int ret;48 int result = 0;49 50 ret = ioctl(fd, VIDIOC_G_PRIORITY, &old_priority);51 if (ret < 0) {52 printf("Failed to get priority: %s\n", strerror(errno));53 return -1;54 }55 new_priority = (old_priority + 1) % PRIORITY_MAX;56 ret = ioctl(fd, VIDIOC_S_PRIORITY, &new_priority);57 if (ret < 0) {58 printf("Failed to set priority: %s\n", strerror(errno));59 return -1;60 }61 ret = ioctl(fd, VIDIOC_G_PRIORITY, &priority_to_compare);62 if (ret < 0) {63 printf("Failed to get new priority: %s\n", strerror(errno));64 result = -1;65 goto cleanup;66 }67 if (priority_to_compare != new_priority) {68 printf("Priority wasn't set - test failed\n");69 result = -1;70 }71 72cleanup:73 ret = ioctl(fd, VIDIOC_S_PRIORITY, &old_priority);74 if (ret < 0) {75 printf("Failed to restore priority: %s\n", strerror(errno));76 return -1;77 }78 return result;79}80 81int loop_test(int fd)82{83 int count;84 struct v4l2_tuner vtuner;85 struct v4l2_capability vcap;86 int ret;87 88 /* Generate random number of interations */89 srand((unsigned int) time(NULL));90 count = rand();91 92 printf("\nNote:\n"93 "While test is running, remove the device or unbind\n"94 "driver and ensure there are no use after free errors\n"95 "and other Oops in the dmesg. When possible, enable KaSan\n"96 "kernel config option for use-after-free error detection.\n\n");97 98 while (count > 0) {99 ret = ioctl(fd, VIDIOC_QUERYCAP, &vcap);100 if (ret < 0)101 printf("VIDIOC_QUERYCAP errno %s\n", strerror(errno));102 else103 printf("Video device driver %s\n", vcap.driver);104 105 ret = ioctl(fd, VIDIOC_G_TUNER, &vtuner);106 if (ret < 0)107 printf("VIDIOC_G_TUNER, errno %s\n", strerror(errno));108 else109 printf("type %d rangelow %d rangehigh %d\n",110 vtuner.type, vtuner.rangelow, vtuner.rangehigh);111 sleep(10);112 count--;113 }114 return 0;115}116 117int main(int argc, char **argv)118{119 int opt;120 char video_dev[256];121 int fd;122 int test_result;123 124 if (argc < 2) {125 printf("Usage: %s [-d </dev/videoX>]\n", argv[0]);126 exit(-1);127 }128 129 /* Process arguments */130 while ((opt = getopt(argc, argv, "d:")) != -1) {131 switch (opt) {132 case 'd':133 strncpy(video_dev, optarg, sizeof(video_dev) - 1);134 video_dev[sizeof(video_dev)-1] = '\0';135 break;136 default:137 printf("Usage: %s [-d </dev/videoX>]\n", argv[0]);138 exit(-1);139 }140 }141 142 /* Open Video device and keep it open */143 fd = open(video_dev, O_RDWR);144 if (fd == -1) {145 printf("Video Device open errno %s\n", strerror(errno));146 exit(-1);147 }148 149 test_result = priority_test(fd);150 if (!test_result)151 printf("Priority test - PASSED\n");152 else153 printf("Priority test - FAILED\n");154 155 loop_test(fd);156}157