zephyr: mchp: Add shim kscan

Add shim layer kscan code

BUG=none
BRANCH=main
TEST=zmake testall

Signed-off-by: martin yan <martin.yan@microchip.corp-partner.google.com>
Change-Id: I2b319e0ed90b9f65961c31a6ab2ccc7525dd6040
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3546984
Reviewed-by: Wai-Hong Tam <waihong@google.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/zephyr/shim/chip/mchp/keyboard_raw.c b/zephyr/shim/chip/mchp/keyboard_raw.c
new file mode 100644
index 0000000000..462a18e5f3
--- /dev/null
+++ b/zephyr/shim/chip/mchp/keyboard_raw.c
@@ -0,0 +1,24 @@
+/* Copyright 2022 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Functions needed by keyboard scanner module for Chrome EC */
+
+#include <device.h>
+#include <logging/log.h>
+#include <soc.h>
+#include <zephyr.h>
+
+#include "drivers/cros_kb_raw.h"
+#include "keyboard_raw.h"
+
+/**
+ * Return true if the current value of the given input GPIO port is zero
+ */
+int keyboard_raw_is_input_low(int port, int id)
+{
+	const struct device *io_dev = mchp_xec_get_gpio_dev(port);
+
+	return gpio_pin_get_raw(io_dev, id) == 0;
+}