The input subsystem doesn't currently have any unit tests, let's add a
CONFIG_INPUT_KUNIT_TEST option that builds a test suite to be executed
with the KUnit test infrastructure.
For now, only three tests were added for some of the input core helper
functions that are trivial to test:
* input_test_polling: set/get poll interval and set-up a poll handler.
* input_test_timestamp: set/get input event timestamps.
* input_test_match_device_id: match a device by bus, vendor, product,
version and events capable of handling.
But having the minimal KUnit support allows to add more tests and suites
as follow-up changes. The tests can be run with the following command:
$ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/input/tests/
Signed-off-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
Tested-by: Enric Balletbo i Serra <eballetbo@xxxxxxxxxx>
---
Changes in v2:
- Add Enric's Tested-by tag.
- Drop the .kunitconfig from the example command (Daniel Latypov).
- Add .kunitconfig that wasn't added by mistake (Daniel Latypov).
- Remove ref to KUnit docs in the Kconfig help text (Daniel Latypov).
- Inline function calls in the KUNIT_ASSERT_*() calls (Daniel Latypov).
- Add some comments to explain why a fail or success is expected.
drivers/input/Kconfig | 10 +++
drivers/input/Makefile | 1 +
drivers/input/tests/.kunitconfig | 3 +
drivers/input/tests/Makefile | 3 +
drivers/input/tests/input_test.c | 150 +++++++++++++++++++++++++++++++
5 files changed, 167 insertions(+)
create mode 100644 drivers/input/tests/.kunitconfig
create mode 100644 drivers/input/tests/Makefile
create mode 100644 drivers/input/tests/input_test.c
diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index e2752f7364bc..735f90b74ee5 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -166,6 +166,16 @@ config INPUT_EVBUG
To compile this driver as a module, choose M here: the
module will be called evbug.
+config INPUT_KUNIT_TEST
+ tristate "KUnit tests for Input" if !KUNIT_ALL_TESTS
+ depends on INPUT && KUNIT=y
+ default KUNIT_ALL_TESTS
+ help
+ Say Y here if you want to build the KUnit tests for the input
+ subsystem.
+
+ If in doubt, say "N".
+
config INPUT_APMPOWER
tristate "Input Power Event -> APM Bridge" if EXPERT
depends on INPUT && APM_EMULATION
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 2266c7d010ef..c78753274921 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_INPUT_JOYSTICK) += joystick/
obj-$(CONFIG_INPUT_TABLET) += tablet/
obj-$(CONFIG_INPUT_TOUCHSCREEN) += touchscreen/
obj-$(CONFIG_INPUT_MISC) += misc/
+obj-$(CONFIG_INPUT_KUNIT_TEST) += tests/
obj-$(CONFIG_INPUT_APMPOWER) += apm-power.o
diff --git a/drivers/input/tests/.kunitconfig b/drivers/input/tests/.kunitconfig
new file mode 100644
index 000000000000..2f5bedf8028e
--- /dev/null
+++ b/drivers/input/tests/.kunitconfig
@@ -0,0 +1,3 @@
+CONFIG_KUNIT=y
+CONFIG_INPUT=y
+CONFIG_INPUT_KUNIT_TEST=y
diff --git a/drivers/input/tests/Makefile b/drivers/input/tests/Makefile
new file mode 100644
index 000000000000..90cf954181bc
--- /dev/null
+++ b/drivers/input/tests/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_INPUT_KUNIT_TEST) += input_test.o
diff --git a/drivers/input/tests/input_test.c b/drivers/input/tests/input_test.c
new file mode 100644
index 000000000000..e5a6c1ad2167
--- /dev/null
+++ b/drivers/input/tests/input_test.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test for the input core.
+ *
+ * Copyright (c) 2023 Red Hat Inc
+ */
+
+#include <linux/delay.h>
+#include <linux/input.h>
+
+#include <kunit/test.h>
+
+#define POLL_INTERVAL 100
+
+static int input_test_init(struct kunit *test)
+{
+ struct input_dev *input_dev;
+ int ret;
+
+ input_dev = input_allocate_device();
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, input_dev);
+
+ input_dev->name = "Test input device";
+ input_dev->id.bustype = BUS_VIRTUAL;
+ input_dev->id.vendor = 1;
+ input_dev->id.product = 1;
+ input_dev->id.version = 1;
+ input_set_capability(input_dev, EV_KEY, BTN_LEFT);
+ input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
+
+ ret = input_register_device(input_dev);
+ if (ret) {
+ input_free_device(input_dev);
+ KUNIT_ASSERT_FAILURE(test, "Register device failed: %d", ret);
+ }
+
+ test->priv = input_dev;
+
+ return 0;
+}
+
+static void input_test_exit(struct kunit *test)
+{
+ struct input_dev *input_dev = test->priv;
+
+ input_unregister_device(input_dev);
+ input_free_device(input_dev);
+}
+
+static void input_test_poll(struct input_dev *input) { }
+
+static void input_test_polling(struct kunit *test)
+{
+ struct input_dev *input_dev = test->priv;
+
+ /* Must fail because a poll handler has not been set-up yet */
+ KUNIT_ASSERT_EQ(test, input_get_poll_interval(input_dev), -EINVAL);
+
+ KUNIT_ASSERT_EQ(test, input_setup_polling(input_dev, input_test_poll), 0);
+
+ input_set_poll_interval(input_dev, POLL_INTERVAL);
+
+ /* Must succeed because poll handler was set-up and poll interval set */
+ KUNIT_ASSERT_EQ(test, input_get_poll_interval(input_dev), POLL_INTERVAL);
+}
+
+static void input_test_timestamp(struct kunit *test)
+{
+ const ktime_t invalid_timestamp = ktime_set(0, 0);
+ struct input_dev *input_dev = test->priv;
+ ktime_t *timestamp, time;
+
+ timestamp = input_get_timestamp(input_dev);
+ time = timestamp[INPUT_CLK_MONO];
+
+ /* The returned timestamp must always be valid */
+ KUNIT_ASSERT_EQ(test, ktime_compare(time, invalid_timestamp), 1);
+
+ time = ktime_get();
+ input_set_timestamp(input_dev, time);
+
+ timestamp = input_get_timestamp(input_dev);
+ /* The timestamp must be the same than set before */
+ KUNIT_ASSERT_EQ(test, ktime_compare(timestamp[INPUT_CLK_MONO], time), 0);
+}
+
+static void input_test_match_device_id(struct kunit *test)
+{
+ struct input_dev *input_dev = test->priv;
+ struct input_device_id id;
+
+ /*
+ * Must match when the input device bus, vendor, product, version
+ * and events capable of handling are the same and fail to match
+ * otherwise.
+ */
+ id.flags = INPUT_DEVICE_ID_MATCH_BUS;
+ id.bustype = BUS_VIRTUAL;
+ KUNIT_ASSERT_TRUE(test, input_match_device_id(input_dev, &id));
+
+ id.bustype = BUS_I2C;
+ KUNIT_ASSERT_FALSE(test, input_match_device_id(input_dev, &id));
+
+ id.flags = INPUT_DEVICE_ID_MATCH_VENDOR;
+ id.vendor = 1;
+ KUNIT_ASSERT_TRUE(test, input_match_device_id(input_dev, &id));
+
+ id.vendor = 2;
+ KUNIT_ASSERT_FALSE(test, input_match_device_id(input_dev, &id));
+
+ id.flags = INPUT_DEVICE_ID_MATCH_PRODUCT;
+ id.product = 1;
+ KUNIT_ASSERT_TRUE(test, input_match_device_id(input_dev, &id));
+
+ id.product = 2;
+ KUNIT_ASSERT_FALSE(test, input_match_device_id(input_dev, &id));
+
+ id.flags = INPUT_DEVICE_ID_MATCH_VERSION;
+ id.version = 1;
+ KUNIT_ASSERT_TRUE(test, input_match_device_id(input_dev, &id));
+
+ id.version = 2;
+ KUNIT_ASSERT_FALSE(test, input_match_device_id(input_dev, &id));
+
+ id.flags = INPUT_DEVICE_ID_MATCH_EVBIT;
+ __set_bit(EV_KEY, id.evbit);
+ KUNIT_ASSERT_TRUE(test, input_match_device_id(input_dev, &id));
+
+ __set_bit(EV_ABS, id.evbit);
+ KUNIT_ASSERT_FALSE(test, input_match_device_id(input_dev, &id));
+}
+
+static struct kunit_case input_tests[] = {
+ KUNIT_CASE(input_test_polling),
+ KUNIT_CASE(input_test_timestamp),
+ KUNIT_CASE(input_test_match_device_id),
+ { /* sentinel */ }
+};
+
+static struct kunit_suite input_test_suite = {
+ .name = "input_core",
+ .init = input_test_init,
+ .exit = input_test_exit,
+ .test_cases = input_tests,
+};
+
+kunit_test_suite(input_test_suite);
+
+MODULE_AUTHOR("Javier Martinez Canillas <javierm@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
base-commit: 3a93e40326c8f470e71d20b4c42d36767450f38f
--
2.40.0
