zephyr: shim the keyboard scan

It shims the keyboard_scan task by introducing another keyboard_raw.c
which calls down to the zephyr-chrome cros_kb_raw driver.

BRANCH=none
BUG=b:167405015
TEST=Build pass by zmake configure -B ./build projects/experimental/volteer.
TEST=Check all the keys on volteer platform by "ksstate".

Change-Id: Ic87f67c28779f7feafa350020a07ba87e3600ecd
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Wealian Liao <whliao@nuvoton.corp-partner.google.com>
Signed-off-by: Mulin Chao <MLChao@nuvoton.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2523839
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>

3 files changed, 123 insertions, 0 deletions

diff --git a/zephyr/shim/chip/npcx/CMakeLists.txt b/zephyr/shim/chip/npcx/CMakeLists.txt
index d464cc3e0b..0c08b9cedd 100644
--- a/zephyr/shim/chip/npcx/CMakeLists.txt
+++ b/zephyr/shim/chip/npcx/CMakeLists.txt
@@ -4,3 +4,5 @@
 
 string(TOLOWER "i2c-${CHIP_FAMILY}.c" chip_specific_i2c_shim)
 zephyr_sources(${chip_specific_i2c_shim})
+zephyr_sources(clock.c)
+zephyr_sources(keyboard_raw.c)
diff --git a/zephyr/shim/chip/npcx/clock.c b/zephyr/shim/chip/npcx/clock.c
new file mode 100644
index 0000000000..8321d5f6d3
--- /dev/null
+++ b/zephyr/shim/chip/npcx/clock.c
@@ -0,0 +1,31 @@
+/* Copyright 2020 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.
+ */
+
+#include <device.h>
+#include <drivers/clock_control.h>
+#include <dt-bindings/clock/npcx_clock.h>
+#include <kernel.h>
+#include <logging/log.h>
+#include <soc.h>
+#include <zephyr.h>
+
+LOG_MODULE_REGISTER(shim_clock, LOG_LEVEL_ERR);
+
+int clock_get_freq(void)
+{
+	const struct device *clk_dev = device_get_binding(NPCX_CLK_CTRL_NAME);
+	const struct npcx_clk_cfg clk_cfg = {
+		.bus = NPCX_CLOCK_BUS_CORE,
+	};
+	uint32_t rate;
+
+	if (clock_control_get_rate(clk_dev, (clock_control_subsys_t *)&clk_cfg,
+				   &rate) != 0) {
+		LOG_ERR("Get %s clock rate error", clk_dev->name);
+		return -EIO;
+	}
+
+	return rate;
+}
diff --git a/zephyr/shim/chip/npcx/keyboard_raw.c b/zephyr/shim/chip/npcx/keyboard_raw.c
new file mode 100644
index 0000000000..f19b26d873
--- /dev/null
+++ b/zephyr/shim/chip/npcx/keyboard_raw.c
@@ -0,0 +1,90 @@
+/* Copyright 2020 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 <drivers/clock_control.h>
+#include <dt-bindings/clock/npcx_clock.h>
+#include <logging/log.h>
+#include <soc.h>
+#include <zephyr.h>
+
+#include "drivers/cros_kb_raw.h"
+#include "keyboard_raw.h"
+
+LOG_MODULE_REGISTER(shim_cros_kb_raw, LOG_LEVEL_ERR);
+
+#define CROS_KB_RAW_DEV DT_LABEL(DT_NODELABEL(cros_kb_raw))
+static const struct device *cros_kb_raw_dev;
+
+/**
+ * Initialize the raw keyboard interface.
+ */
+void keyboard_raw_init(void)
+{
+	cros_kb_raw_dev = device_get_binding(CROS_KB_RAW_DEV);
+	if (!cros_kb_raw_dev) {
+		LOG_ERR("Fail to find %s", CROS_KB_RAW_DEV);
+		return;
+	}
+
+	LOG_INF("%s", __func__);
+	cros_kb_raw_init(cros_kb_raw_dev);
+}
+
+/**
+ * Finish initialization after task scheduling has started.
+ */
+void keyboard_raw_task_start(void)
+{
+	keyboard_raw_enable_interrupt(1);
+}
+
+/**
+ * Drive the specified column low.
+ */
+test_mockable void keyboard_raw_drive_column(int col)
+{
+	if (cros_kb_raw_dev)
+		cros_kb_raw_drive_column(cros_kb_raw_dev, col);
+	else
+		LOG_ERR("%s: no cros_kb_raw device!", __func__);
+}
+
+/**
+ * Read raw row state.
+ * Bits are 1 if signal is present, 0 if not present.
+ */
+test_mockable int keyboard_raw_read_rows(void)
+{
+	if (cros_kb_raw_dev) {
+		return cros_kb_raw_read_rows(cros_kb_raw_dev);
+	} else {
+		LOG_ERR("%s: no cros_kb_raw device!", __func__);
+		return -EIO;
+	}
+}
+
+/**
+ * Enable or disable keyboard interrupts.
+ */
+void keyboard_raw_enable_interrupt(int enable)
+{
+	if (cros_kb_raw_dev)
+		cros_kb_raw_enable_interrupt(cros_kb_raw_dev, enable);
+	else
+		LOG_ERR("%s: no cros_kb_raw device!", __func__);
+}
+
+/**
+ * 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 = npcx_get_gpio_dev(port);
+
+	return gpio_pin_get_raw(io_dev, id) == 0;
+}