1// SPDX-License-Identifier: GPL-2.0
2
3/*
4 * video_device_test - Video Device 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 Video Device. This test should not be included
13 * in the Kselftest run. This test should be run when hardware and driver
14 * that makes use of V4L2 API is present.
15 *
16 * This test opens user specified Video Device and calls video ioctls in a
17 * loop once every 10 seconds.
18 *
19 * Usage:
20 *	sudo ./video_device_test -d /dev/videoX
21 *
22 *	While test is running, remove the device or unbind the driver and
23 *	ensure there are no use after free errors and other Oops in the
24 *	dmesg.
25 *	When possible, enable KaSan kernel config option for use-after-free
26 *	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 4
41
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		else
103			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		else
109			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	else
153		printf("Priority test - FAILED\n");
154
155	loop_test(fd);
156}
157