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Input: Add KUnit tests for some of the input core helper functions 

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@redhat.com>
Tested-by: Enric Balletbo i Serra <eballetbo@redhat.com>
config: powerpc-allnoconfig (https://download.01.org/0day-ci/archive/20230330/202303301815.kRKFM3NH-lkp@intel.com/config)
Link: https://lore.kernel.org/r/20230330081831.2291351-1-javierm@redhat.com

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Javier Martinez Canillas 2023-04-01 22:45:09 -07:00 committed by Dmitry Torokhov
parent 57d94d150d
commit fdefcbdd6f
5 changed files with 167 additions and 0 deletions
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10
drivers/input/Kconfig
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@ -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

1
drivers/input/Makefile
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@ -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

3
drivers/input/tests/.kunitconfig Normal file
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@ -0,0 +1,3 @@
CONFIG_KUNIT=y
CONFIG_INPUT=y
CONFIG_INPUT_KUNIT_TEST=y

3
drivers/input/tests/Makefile Normal file
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@ -0,0 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_INPUT_KUNIT_TEST) += input_test.o

150
drivers/input/tests/input_test.c Normal file
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@ -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@redhat.com>");
MODULE_LICENSE("GPL");