new file mode 100644
@@ -0,0 +1,4 @@
+CONFIG_KUNIT=y
+CONFIG_NEW_LEDS=y
+CONFIG_LEDS_CLASS=y
+CONFIG_LEDS_KUNIT_TEST=y
@@ -55,6 +55,13 @@ config LEDS_BRIGHTNESS_HW_CHANGED
See Documentation/ABI/testing/sysfs-class-led for details.
+config LEDS_KUNIT_TEST
+ tristate "KUnit tests for LEDs"
+ depends on KUNIT && LEDS_CLASS
+ default KUNIT_ALL_TESTS
+ help
+ Say Y here to enable KUnit testing for the LEDs framework.
+
comment "LED drivers"
config LEDS_88PM860X
@@ -6,6 +6,7 @@ obj-$(CONFIG_LEDS_CLASS) += led-class.o
obj-$(CONFIG_LEDS_CLASS_FLASH) += led-class-flash.o
obj-$(CONFIG_LEDS_CLASS_MULTICOLOR) += led-class-multicolor.o
obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o
+obj-$(CONFIG_LEDS_KUNIT_TEST) += led-test.o
# LED Platform Drivers (keep this sorted, M-| sort)
obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
new file mode 100644
@@ -0,0 +1,76 @@
+// 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>
+
+struct led_test_ddata {
+ struct led_classdev cdev;
+ struct device *dev;
+};
+
+static void led_test_class_register(struct kunit *test)
+{
+ struct led_test_ddata *ddata = test->priv;
+ struct led_classdev *cdev = &ddata->cdev;
+ struct device *dev = ddata->dev;
+ int ret;
+
+ cdev->name = "led-test";
+
+ ret = devm_led_classdev_register(dev, cdev);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+ if (ret)
+ return;
+}
+
+static struct kunit_case led_test_cases[] = {
+ KUNIT_CASE(led_test_class_register),
+ { }
+};
+
+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");
Apply a very basic implementation of KUnit LED testing. More tests / use-cases will be added steadily over time. CMD: tools/testing/kunit/kunit.py run --kunitconfig drivers/leds OUTPUT: [15:34:19] Configuring KUnit Kernel ... [15:34:19] Building KUnit Kernel ... Populating config with: $ make ARCH=um O=.kunit olddefconfig Building with: $ make all compile_commands.json scripts_gdb ARCH=um O=.kunit --jobs=20 [15:34:22] Starting KUnit Kernel (1/1)... [15:34:22] ============================================================ Running tests with: $ .kunit/linux kunit.enable=1 mem=1G console=tty kunit_shutdown=halt [15:34:23] ===================== led (1 subtest) ====================== [15:34:23] [PASSED] led_test_class_register [15:34:23] ======================= [PASSED] led ======================= [15:34:23] ============================================================ [15:34:23] Testing complete. Ran 1 tests: passed: 1 [15:34:23] Elapsed time: 4.268s total, 0.001s configuring, 3.048s building, 1.214s running Signed-off-by: Lee Jones <lee@kernel.org> --- drivers/leds/.kunitconfig | 4 +++ drivers/leds/Kconfig | 7 ++++ drivers/leds/Makefile | 1 + drivers/leds/led-test.c | 76 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 88 insertions(+) create mode 100644 drivers/leds/.kunitconfig create mode 100644 drivers/leds/led-test.c