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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2025 Google LLC
*
* Author: Lee Jones <lee@kernel.org>
*/
#include <kunit/device.h>
#include <kunit/test.h>
#include <linux/device.h>
#include <linux/leds.h>
#define LED_TEST_POST_REG_BRIGHTNESS 10
struct led_test_ddata {
struct led_classdev cdev;
struct device *dev;
};
static enum led_brightness led_test_brightness_get(struct led_classdev *cdev)
{
return LED_TEST_POST_REG_BRIGHTNESS;
}
static void led_test_class_register(struct kunit *test)
{
struct led_test_ddata *ddata = test->priv;
struct led_classdev *cdev_clash, *cdev = &ddata->cdev;
struct device *dev = ddata->dev;
int ret;
/* Register a LED class device */
cdev->name = "led-test";
cdev->brightness_get = led_test_brightness_get;
cdev->brightness = 0;
ret = devm_led_classdev_register(dev, cdev);
KUNIT_ASSERT_EQ(test, ret, 0);
KUNIT_EXPECT_EQ(test, cdev->max_brightness, LED_FULL);
KUNIT_EXPECT_EQ(test, cdev->brightness, LED_TEST_POST_REG_BRIGHTNESS);
KUNIT_EXPECT_STREQ(test, cdev->dev->kobj.name, "led-test");
/* Register again with the same name - expect it to pass with the LED renamed */
cdev_clash = devm_kmemdup(dev, cdev, sizeof(*cdev), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cdev_clash);
ret = devm_led_classdev_register(dev, cdev_clash);
KUNIT_ASSERT_EQ(test, ret, 0);
KUNIT_EXPECT_STREQ(test, cdev_clash->dev->kobj.name, "led-test_1");
KUNIT_EXPECT_STREQ(test, cdev_clash->name, "led-test");
/* Enable name conflict rejection and register with the same name again - expect failure */
cdev_clash->flags |= LED_REJECT_NAME_CONFLICT;
ret = devm_led_classdev_register(dev, cdev_clash);
KUNIT_EXPECT_EQ(test, ret, -EEXIST);
}
static void led_test_class_add_lookup_and_get(struct kunit *test)
{
struct led_test_ddata *ddata = test->priv;
struct led_classdev *cdev = &ddata->cdev, *cdev_get;
struct device *dev = ddata->dev;
struct led_lookup_data lookup;
int ret;
/* First, register a LED class device */
cdev->name = "led-test";
ret = devm_led_classdev_register(dev, cdev);
KUNIT_ASSERT_EQ(test, ret, 0);
/* Then make the LED available for lookup */
lookup.provider = cdev->name;
lookup.dev_id = dev_name(dev);
lookup.con_id = "led-test-1";
led_add_lookup(&lookup);
/* Finally, attempt to look it up via the API - imagine this was an orthogonal driver */
cdev_get = devm_led_get(dev, "led-test-1");
KUNIT_ASSERT_FALSE(test, IS_ERR(cdev_get));
KUNIT_EXPECT_STREQ(test, cdev_get->name, cdev->name);
led_remove_lookup(&lookup);
}
static struct kunit_case led_test_cases[] = {
KUNIT_CASE(led_test_class_register),
KUNIT_CASE(led_test_class_add_lookup_and_get),
{ }
};
static int led_test_init(struct kunit *test)
{
struct led_test_ddata *ddata;
struct device *dev;
ddata = kunit_kzalloc(test, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
test->priv = ddata;
dev = kunit_device_register(test, "led_test");
if (IS_ERR(dev))
return PTR_ERR(dev);
ddata->dev = get_device(dev);
return 0;
}
static void led_test_exit(struct kunit *test)
{
struct led_test_ddata *ddata = test->priv;
if (ddata && ddata->dev)
put_device(ddata->dev);
}
static struct kunit_suite led_test_suite = {
.name = "led",
.init = led_test_init,
.exit = led_test_exit,
.test_cases = led_test_cases,
};
kunit_test_suite(led_test_suite);
MODULE_AUTHOR("Lee Jones <lee@kernel.org>");
MODULE_DESCRIPTION("KUnit tests for the LED framework");
MODULE_LICENSE("GPL");
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