1 files changed, 98 insertions, 0 deletions
diff --git a/drivers/platform/chrome/cros_kunit_util.c b/drivers/platform/chrome/cros_kunit_util.c
new file mode 100644
index 000000000000..e031777dea87
--- /dev/null
+++ b/drivers/platform/chrome/cros_kunit_util.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CrOS Kunit tests utilities.
+ */
+
+#include <kunit/test.h>
+
+#include <linux/list.h>
+#include <linux/minmax.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
+
+#include "cros_ec.h"
+#include "cros_kunit_util.h"
+
+int cros_kunit_ec_xfer_mock_default_ret;
+EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_default_ret);
+
+static struct list_head cros_kunit_ec_xfer_mock_in;
+static struct list_head cros_kunit_ec_xfer_mock_out;
+
+int cros_kunit_ec_xfer_mock(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
+{
+	struct ec_xfer_mock *mock;
+
+	mock = list_first_entry_or_null(&cros_kunit_ec_xfer_mock_in, struct ec_xfer_mock, list);
+	if (!mock)
+		return cros_kunit_ec_xfer_mock_default_ret;
+
+	list_del(&mock->list);
+
+	memcpy(&mock->msg, msg, sizeof(*msg));
+	if (msg->outsize) {
+		mock->i_data = kunit_kzalloc(mock->test, msg->outsize, GFP_KERNEL);
+		if (mock->i_data)
+			memcpy(mock->i_data, msg->data, msg->outsize);
+	}
+
+	msg->result = mock->result;
+	if (msg->insize)
+		memcpy(msg->data, mock->o_data, min(msg->insize, mock->o_data_len));
+
+	list_add_tail(&mock->list, &cros_kunit_ec_xfer_mock_out);
+
+	return mock->ret;
+}
+EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock);
+
+struct ec_xfer_mock *cros_kunit_ec_xfer_mock_add(struct kunit *test, size_t size)
+{
+	return cros_kunit_ec_xfer_mock_addx(test, size, EC_RES_SUCCESS, size);
+}
+EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_add);
+
+struct ec_xfer_mock *cros_kunit_ec_xfer_mock_addx(struct kunit *test,
+						  int ret, int result, size_t size)
+{
+	struct ec_xfer_mock *mock;
+
+	mock = kunit_kzalloc(test, sizeof(*mock), GFP_KERNEL);
+	if (!mock)
+		return NULL;
+
+	list_add_tail(&mock->list, &cros_kunit_ec_xfer_mock_in);
+	mock->test = test;
+
+	mock->ret = ret;
+	mock->result = result;
+	mock->o_data = kunit_kzalloc(test, size, GFP_KERNEL);
+	if (!mock->o_data)
+		return NULL;
+	mock->o_data_len = size;
+
+	return mock;
+}
+EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_addx);
+
+struct ec_xfer_mock *cros_kunit_ec_xfer_mock_next(void)
+{
+	struct ec_xfer_mock *mock;
+
+	mock = list_first_entry_or_null(&cros_kunit_ec_xfer_mock_out, struct ec_xfer_mock, list);
+	if (mock)
+		list_del(&mock->list);
+
+	return mock;
+}
+EXPORT_SYMBOL_GPL(cros_kunit_ec_xfer_mock_next);
+
+void cros_kunit_mock_reset(void)
+{
+	cros_kunit_ec_xfer_mock_default_ret = 0;
+	INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_in);
+	INIT_LIST_HEAD(&cros_kunit_ec_xfer_mock_out);
+}
+EXPORT_SYMBOL_GPL(cros_kunit_mock_reset);
+
+MODULE_LICENSE("GPL");