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101 lines
2.5 KiB
101 lines
2.5 KiB
// 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 <[email protected]> |
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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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