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Subject[PATCH v3 2/4] HID: uclogic: Add KUnit tests for uclogic_rdesc_template_apply()
Date
The uclogic_rdesc_template_apply() function is used by the driver to
generate HID descriptors from templates.

In order to avoid regressions in future patches, add KUnit tests to
test the function.

Signed-off-by: José Expósito <jose.exposito89@gmail.com>
---
drivers/hid/.kunitconfig | 2 +
drivers/hid/Kconfig | 11 ++
drivers/hid/Makefile | 3 +
drivers/hid/hid-uclogic-rdesc-test.c | 183 +++++++++++++++++++++++++++
4 files changed, 199 insertions(+)
create mode 100644 drivers/hid/.kunitconfig
create mode 100644 drivers/hid/hid-uclogic-rdesc-test.c

diff --git a/drivers/hid/.kunitconfig b/drivers/hid/.kunitconfig
new file mode 100644
index 000000000000..c784d098aba9
--- /dev/null
+++ b/drivers/hid/.kunitconfig
@@ -0,0 +1,2 @@
+CONFIG_KUNIT=y
+CONFIG_HID_UCLOGIC_KUNIT_TEST=y
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 70da5931082f..d7229ad7d0d4 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -469,6 +469,17 @@ config HID_UCLOGIC
help
Support for UC-Logic and Huion tablets.

+config HID_UCLOGIC_KUNIT_TEST
+ bool "UC-Logic tests" if !KUNIT_ALL_TESTS
+ depends on KUNIT=y
+ default KUNIT_ALL_TESTS
+ help
+ KUnit tests for the UC-Logic driver. This option is not
+ useful for distributions or general kernels, recommended
+ for driver developers only.
+
+ If in doubt, say "N".
+
config HID_WALTOP
tristate "Waltop"
depends on HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index cac2cbe26d11..76d7ff89a26c 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -129,6 +129,9 @@ hid-uclogic-objs := hid-uclogic-core.o \
hid-uclogic-rdesc.o \
hid-uclogic-params.o
obj-$(CONFIG_HID_UCLOGIC) += hid-uclogic.o
+obj-$(CONFIG_HID_UCLOGIC_KUNIT_TEST) += hid-uclogic-rdesc.o \
+ hid-uclogic-rdesc-test.o
+CFLAGS_hid-uclogic-rdesc-test.o += $(DISABLE_STRUCTLEAK_PLUGIN)
obj-$(CONFIG_HID_UDRAW_PS3) += hid-udraw-ps3.o
obj-$(CONFIG_HID_LED) += hid-led.o
obj-$(CONFIG_HID_XIAOMI) += hid-xiaomi.o
diff --git a/drivers/hid/hid-uclogic-rdesc-test.c b/drivers/hid/hid-uclogic-rdesc-test.c
new file mode 100644
index 000000000000..ded59e226230
--- /dev/null
+++ b/drivers/hid/hid-uclogic-rdesc-test.c
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * HID driver for UC-Logic devices not fully compliant with HID standard
+ *
+ * Copyright (c) 2022 José Expósito <jose.exposito89@gmail.com>
+ */
+
+#include <kunit/test.h>
+#include "./hid-uclogic-rdesc.h"
+
+struct uclogic_template_case {
+ const char *name;
+ const __u8 *template;
+ size_t template_size;
+ const s32 *param_list;
+ size_t param_num;
+ const __u8 *expected;
+};
+
+static const s32 params_pen_all[UCLOGIC_RDESC_PH_ID_NUM] = {
+ [UCLOGIC_RDESC_PEN_PH_ID_X_LM] = 0xAA,
+ [UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0xBB,
+ [UCLOGIC_RDESC_PEN_PH_ID_Y_LM] = 0xCC,
+ [UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0xDD,
+ [UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] = 0xEE,
+};
+
+static const s32 params_pen_some[] = {
+ [UCLOGIC_RDESC_PEN_PH_ID_X_LM] = 0xAA,
+ [UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0xBB,
+};
+
+static const __u8 template_empty[] = { };
+static const __u8 template_small[] = { 0x00 };
+static const __u8 template_no_ph[] = { 0xAA, 0xFE, 0xAA, 0xED, 0x1D };
+
+static const __u8 template_pen_ph_end[] = {
+ 0xAA, 0xBB, UCLOGIC_RDESC_PEN_PH_HEAD
+};
+
+static const __u8 template_pen_all_params[] = {
+ UCLOGIC_RDESC_PEN_PH(X_LM),
+ 0x47, UCLOGIC_RDESC_PEN_PH(X_PM),
+ 0x27, UCLOGIC_RDESC_PEN_PH(Y_LM),
+ UCLOGIC_RDESC_PEN_PH(Y_PM),
+ 0x00, UCLOGIC_RDESC_PEN_PH(PRESSURE_LM),
+};
+
+static const __u8 expected_pen_all_params[] = {
+ 0xAA, 0x00, 0x00, 0x00,
+ 0x47, 0xBB, 0x00, 0x00, 0x00,
+ 0x27, 0xCC, 0x00, 0x00, 0x00,
+ 0xDD, 0x00, 0x00, 0x00,
+ 0x00, 0xEE, 0x00, 0x00, 0x00,
+};
+
+static const __u8 template_pen_some_params[] = {
+ 0x01, 0x02,
+ UCLOGIC_RDESC_PEN_PH(X_LM),
+ 0x03, UCLOGIC_RDESC_PEN_PH(X_PM),
+ 0x04, 0x05,
+};
+
+static const __u8 expected_pen_some_params[] = {
+ 0x01, 0x02,
+ 0xAA, 0x00, 0x00, 0x00,
+ 0x03, 0xBB, 0x00, 0x00, 0x00,
+ 0x04, 0x05,
+};
+
+static const __u8 template_params_none[] = {
+ 0x27, UCLOGIC_RDESC_PEN_PH(Y_LM),
+ UCLOGIC_RDESC_PEN_PH(Y_PM),
+ 0x00, UCLOGIC_RDESC_PEN_PH(PRESSURE_LM),
+};
+
+static struct uclogic_template_case uclogic_template_cases[] = {
+ {
+ .name = "Empty template",
+ .template = template_empty,
+ .template_size = sizeof(template_empty),
+ .param_list = params_pen_all,
+ .param_num = ARRAY_SIZE(params_pen_all),
+ .expected = template_empty,
+ },
+ {
+ .name = "Template smaller than the placeholder",
+ .template = template_small,
+ .template_size = sizeof(template_small),
+ .param_list = params_pen_all,
+ .param_num = ARRAY_SIZE(params_pen_all),
+ .expected = template_small,
+ },
+ {
+ .name = "No placeholder",
+ .template = template_no_ph,
+ .template_size = sizeof(template_no_ph),
+ .param_list = params_pen_all,
+ .param_num = ARRAY_SIZE(params_pen_all),
+ .expected = template_no_ph,
+ },
+ {
+ .name = "Pen placeholder at the end, without ID",
+ .template = template_pen_ph_end,
+ .template_size = sizeof(template_pen_ph_end),
+ .param_list = params_pen_all,
+ .param_num = ARRAY_SIZE(params_pen_all),
+ .expected = template_pen_ph_end,
+ },
+ {
+ .name = "All params present in the pen template",
+ .template = template_pen_all_params,
+ .template_size = sizeof(template_pen_all_params),
+ .param_list = params_pen_all,
+ .param_num = ARRAY_SIZE(params_pen_all),
+ .expected = expected_pen_all_params,
+ },
+ {
+ .name = "Some params present in the pen template (complete param list)",
+ .template = template_pen_some_params,
+ .template_size = sizeof(template_pen_some_params),
+ .param_list = params_pen_all,
+ .param_num = ARRAY_SIZE(params_pen_all),
+ .expected = expected_pen_some_params,
+ },
+ {
+ .name = "Some params present in the pen template (incomplete param list)",
+ .template = template_pen_some_params,
+ .template_size = sizeof(template_pen_some_params),
+ .param_list = params_pen_some,
+ .param_num = ARRAY_SIZE(params_pen_some),
+ .expected = expected_pen_some_params,
+ },
+ {
+ .name = "No params present in the template",
+ .template = template_params_none,
+ .template_size = sizeof(template_params_none),
+ .param_list = params_pen_some,
+ .param_num = ARRAY_SIZE(params_pen_some),
+ .expected = template_params_none,
+ },
+};
+
+static void uclogic_template_case_desc(struct uclogic_template_case *t,
+ char *desc)
+{
+ strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(uclogic_template, uclogic_template_cases,
+ uclogic_template_case_desc);
+
+static void uclogic_template_test(struct kunit *test)
+{
+ __u8 *res;
+ const struct uclogic_template_case *params = test->param_value;
+
+ res = uclogic_rdesc_template_apply(params->template,
+ params->template_size,
+ params->param_list,
+ params->param_num);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, res);
+ KUNIT_EXPECT_EQ(test, 0,
+ memcmp(res, params->expected, params->template_size));
+ kfree(res);
+}
+
+static struct kunit_case hid_uclogic_rdesc_test_cases[] = {
+ KUNIT_CASE_PARAM(uclogic_template_test, uclogic_template_gen_params),
+ {}
+};
+
+static struct kunit_suite hid_uclogic_rdesc_test_suite = {
+ .name = "hid-uclogic-rdesc-test",
+ .test_cases = hid_uclogic_rdesc_test_cases,
+};
+
+kunit_test_suite(hid_uclogic_rdesc_test_suite);
+
+MODULE_DESCRIPTION("KUnit tests for the UC-Logic driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("José Expósito <jose.exposito89@gmail.com>");
--
2.25.1
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