Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2025 Google LLC
4 *
5 * Author: Lee Jones <lee@kernel.org>
6 */
7
8#include <kunit/device.h>
9#include <kunit/test.h>
10#include <linux/device.h>
11#include <linux/leds.h>
12
13#define LED_TEST_POST_REG_BRIGHTNESS 10
14
15struct led_test_ddata {
16 struct led_classdev cdev;
17 struct device *dev;
18};
19
20static enum led_brightness led_test_brightness_get(struct led_classdev *cdev)
21{
22 return LED_TEST_POST_REG_BRIGHTNESS;
23}
24
25static void led_test_class_register(struct kunit *test)
26{
27 struct led_test_ddata *ddata = test->priv;
28 struct led_classdev *cdev_clash, *cdev = &ddata->cdev;
29 struct device *dev = ddata->dev;
30 int ret;
31
32 /* Register a LED class device */
33 cdev->name = "led-test";
34 cdev->brightness_get = led_test_brightness_get;
35 cdev->brightness = 0;
36
37 ret = devm_led_classdev_register(dev, cdev);
38 KUNIT_ASSERT_EQ(test, ret, 0);
39
40 KUNIT_EXPECT_EQ(test, cdev->max_brightness, LED_FULL);
41 KUNIT_EXPECT_EQ(test, cdev->brightness, LED_TEST_POST_REG_BRIGHTNESS);
42 KUNIT_EXPECT_STREQ(test, cdev->dev->kobj.name, "led-test");
43
44 /* Register again with the same name - expect it to pass with the LED renamed */
45 cdev_clash = devm_kmemdup(dev, cdev, sizeof(*cdev), GFP_KERNEL);
46 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cdev_clash);
47
48 ret = devm_led_classdev_register(dev, cdev_clash);
49 KUNIT_ASSERT_EQ(test, ret, 0);
50
51 KUNIT_EXPECT_STREQ(test, cdev_clash->dev->kobj.name, "led-test_1");
52 KUNIT_EXPECT_STREQ(test, cdev_clash->name, "led-test");
53
54 /* Enable name conflict rejection and register with the same name again - expect failure */
55 cdev_clash->flags |= LED_REJECT_NAME_CONFLICT;
56 ret = devm_led_classdev_register(dev, cdev_clash);
57 KUNIT_EXPECT_EQ(test, ret, -EEXIST);
58}
59
60static void led_test_class_add_lookup_and_get(struct kunit *test)
61{
62 struct led_test_ddata *ddata = test->priv;
63 struct led_classdev *cdev = &ddata->cdev, *cdev_get;
64 struct device *dev = ddata->dev;
65 struct led_lookup_data lookup;
66 int ret;
67
68 /* First, register a LED class device */
69 cdev->name = "led-test";
70 ret = devm_led_classdev_register(dev, cdev);
71 KUNIT_ASSERT_EQ(test, ret, 0);
72
73 /* Then make the LED available for lookup */
74 lookup.provider = cdev->name;
75 lookup.dev_id = dev_name(dev);
76 lookup.con_id = "led-test-1";
77 led_add_lookup(&lookup);
78
79 /* Finally, attempt to look it up via the API - imagine this was an orthogonal driver */
80 cdev_get = devm_led_get(dev, "led-test-1");
81 KUNIT_ASSERT_FALSE(test, IS_ERR(cdev_get));
82
83 KUNIT_EXPECT_STREQ(test, cdev_get->name, cdev->name);
84
85 led_remove_lookup(&lookup);
86}
87
88static struct kunit_case led_test_cases[] = {
89 KUNIT_CASE(led_test_class_register),
90 KUNIT_CASE(led_test_class_add_lookup_and_get),
91 { }
92};
93
94static int led_test_init(struct kunit *test)
95{
96 struct led_test_ddata *ddata;
97 struct device *dev;
98
99 ddata = kunit_kzalloc(test, sizeof(*ddata), GFP_KERNEL);
100 if (!ddata)
101 return -ENOMEM;
102
103 test->priv = ddata;
104
105 dev = kunit_device_register(test, "led_test");
106 if (IS_ERR(dev))
107 return PTR_ERR(dev);
108
109 ddata->dev = get_device(dev);
110
111 return 0;
112}
113
114static void led_test_exit(struct kunit *test)
115{
116 struct led_test_ddata *ddata = test->priv;
117
118 if (ddata && ddata->dev)
119 put_device(ddata->dev);
120}
121
122static struct kunit_suite led_test_suite = {
123 .name = "led",
124 .init = led_test_init,
125 .exit = led_test_exit,
126 .test_cases = led_test_cases,
127};
128kunit_test_suite(led_test_suite);
129
130MODULE_AUTHOR("Lee Jones <lee@kernel.org>");
131MODULE_DESCRIPTION("KUnit tests for the LED framework");
132MODULE_LICENSE("GPL");