102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* video_device_test - Video Device Test
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*
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* Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>
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* Copyright (c) 2016 Samsung Electronics Co., Ltd.
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*
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*/
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/*
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* This file adds a test for Video Device. This test should not be included
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* in the Kselftest run. This test should be run when hardware and driver
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* that makes use of V4L2 API is present.
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*
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* This test opens user specified Video Device and calls video ioctls in a
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* loop once every 10 seconds.
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*
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* Usage:
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* sudo ./video_device_test -d /dev/videoX
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*
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* While test is running, remove the device or unbind the driver and
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* ensure there are no use after free errors and other Oops in the
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* dmesg.
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* When possible, enable KaSan kernel config option for use-after-free
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* error detection.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <linux/videodev2.h>
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int main(int argc, char **argv)
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{
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int opt;
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char video_dev[256];
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int count;
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struct v4l2_tuner vtuner;
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struct v4l2_capability vcap;
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int ret;
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int fd;
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if (argc < 2) {
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printf("Usage: %s [-d </dev/videoX>]\n", argv[0]);
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exit(-1);
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}
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/* Process arguments */
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while ((opt = getopt(argc, argv, "d:")) != -1) {
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switch (opt) {
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case 'd':
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strncpy(video_dev, optarg, sizeof(video_dev) - 1);
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video_dev[sizeof(video_dev)-1] = '\0';
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break;
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default:
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printf("Usage: %s [-d </dev/videoX>]\n", argv[0]);
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exit(-1);
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}
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}
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/* Generate random number of interations */
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srand((unsigned int) time(NULL));
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count = rand();
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/* Open Video device and keep it open */
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fd = open(video_dev, O_RDWR);
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if (fd == -1) {
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printf("Video Device open errno %s\n", strerror(errno));
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exit(-1);
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}
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printf("\nNote:\n"
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"While test is running, remove the device or unbind\n"
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"driver and ensure there are no use after free errors\n"
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"and other Oops in the dmesg. When possible, enable KaSan\n"
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"kernel config option for use-after-free error detection.\n\n");
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while (count > 0) {
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ret = ioctl(fd, VIDIOC_QUERYCAP, &vcap);
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if (ret < 0)
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printf("VIDIOC_QUERYCAP errno %s\n", strerror(errno));
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else
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printf("Video device driver %s\n", vcap.driver);
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ret = ioctl(fd, VIDIOC_G_TUNER, &vtuner);
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if (ret < 0)
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printf("VIDIOC_G_TUNER, errno %s\n", strerror(errno));
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else
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printf("type %d rangelow %d rangehigh %d\n",
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vtuner.type, vtuner.rangelow, vtuner.rangehigh);
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sleep(10);
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count--;
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}
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}
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