Introduce ft5336 touch panel driver and integrate into lvgl

boards/arm/mimxrt1050_evk/Kconfig.defconfig

@@ -42,6 +42,9 @@ config GPIO_MCUX_IGPIO_5
 
 endif # GPIO_MCUX_IGPIO
 
+config I2C
+	default y if LVGL
+
 if I2C_MCUX_LPI2C
 
 config I2C_1
@@ -66,6 +69,19 @@ config UART_MCUX_LPUART_3
 
 endif # UART_MCUX_LPUART
 
+config KSCAN
+	default y if LVGL
+
+if KSCAN
+
+config KSCAN_FT5336
+	default y
+
+config KSCAN_INIT_PRIORITY
+	default 60
+
+endif # KSCAN
+
 if NETWORKING
 
 config NET_L2_ETHERNET
@@ -81,6 +97,12 @@ if LVGL
 config LVGL_DISPLAY_DEV_NAME
 	default "ELCDIF_1"
 
+config LVGL_POINTER_KSCAN
+	default y
+
+config LVGL_POINTER_KSCAN_DEV_NAME
+	default "FT5336"
+
 config LVGL_HOR_RES
 	default 480
 

boards/arm/mimxrt1050_evk/mimxrt1050_evk.dts

@@ -120,6 +120,13 @@ arduino_serial: &uart3 {};
 		int1-gpios = <&gpio1 10 0>;
 		int2-gpios = <&gpio1 11 0>;
 	};
+
+	ft5336@38 {
+		compatible = "focaltech,ft5336";
+		reg = <0x38>;
+		label = "FT5336";
+		int-gpios = <&gpio1 11 0>;
+	};
 };
 
 &uart1 {

boards/arm/mimxrt1060_evk/Kconfig.defconfig

@@ -27,6 +27,9 @@ config GPIO_MCUX_IGPIO_5
 
 endif # GPIO_MCUX_IGPIO
 
+config I2C
+	default y if LVGL
+
 if I2C_MCUX_LPI2C
 
 config I2C_1
@@ -44,6 +47,19 @@ config UART_MCUX_LPUART_3
 
 endif # UART_MCUX_LPUART
 
+config KSCAN
+	default y if LVGL
+
+if KSCAN
+
+config KSCAN_FT5336
+	default y
+
+config KSCAN_INIT_PRIORITY
+	default 60
+
+endif # KSCAN
+
 if NETWORKING
 
 config NET_L2_ETHERNET
@@ -59,6 +75,12 @@ if LVGL
 config LVGL_DISPLAY_DEV_NAME
 	default "ELCDIF_1"
 
+config LVGL_POINTER_KSCAN
+	default y
+
+config LVGL_POINTER_KSCAN_DEV_NAME
+	default "FT5336"
+
 config LVGL_HOR_RES
 	default 480
 

boards/arm/mimxrt1060_evk/mimxrt1060_evk.dts

@@ -110,6 +110,13 @@ arduino_serial: &uart3 {};
 
 &i2c1 {
 	status = "okay";
+
+	ft5336@38 {
+		compatible = "focaltech,ft5336";
+		reg = <0x38>;
+		label = "FT5336";
+		int-gpios = <&gpio1 11 0>;
+	};
 };
 
 &uart1 {

boards/arm/mimxrt1064_evk/Kconfig.defconfig

@@ -26,6 +26,9 @@ config GPIO_MCUX_IGPIO_5
 
 endif # GPIO_MCUX_IGPIO
 
+config I2C
+	default y if LVGL
+
 if I2C_MCUX_LPI2C
 
 config I2C_1
@@ -40,6 +43,19 @@ config UART_MCUX_LPUART_1
 
 endif # UART_MCUX_LPUART
 
+config KSCAN
+	default y if LVGL
+
+if KSCAN
+
+config KSCAN_FT5336
+	default y
+
+config KSCAN_INIT_PRIORITY
+	default 60
+
+endif # KSCAN
+
 if NETWORKING
 
 config NET_L2_ETHERNET
@@ -55,6 +71,12 @@ if LVGL
 config LVGL_DISPLAY_DEV_NAME
 	default "ELCDIF_1"
 
+config LVGL_POINTER_KSCAN
+	default y
+
+config LVGL_POINTER_KSCAN_DEV_NAME
+	default "FT5336"
+
 config LVGL_HOR_RES
 	default 480
 

boards/arm/mimxrt1064_evk/mimxrt1064_evk.dts

@@ -119,6 +119,13 @@ arduino_i2c: &i2c1 {};
 			};
 		};
 	};
+
+	ft5336@38 {
+		compatible = "focaltech,ft5336";
+		reg = <0x38>;
+		label = "FT5336";
+		int-gpios = <&gpio1 11 0>;
+	};
 };
 
 &uart1 {

drivers/kscan/CMakeLists.txt

@@ -2,6 +2,7 @@
 
 zephyr_library()
 
+zephyr_library_sources_ifdef(CONFIG_KSCAN_FT5336	kscan_ft5336.c)
 zephyr_library_sources_ifdef(CONFIG_KSCAN_XEC		kscan_mchp_xec.c)
 
 zephyr_library_sources_ifdef(CONFIG_USERSPACE	    kscan_handlers.c)

drivers/kscan/Kconfig

@@ -10,6 +10,7 @@ menuconfig KSCAN
 
 if KSCAN
 
+source "drivers/kscan/Kconfig.ft5336"
 source "drivers/kscan/Kconfig.xec"
 
 module = KSCAN

drivers/kscan/Kconfig.ft5336

@@ -0,0 +1,16 @@
+# Copyright (c) 2020 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig KSCAN_FT5336
+	bool "FT5336 capacitive touch panel driver"
+	depends on I2C && HAS_DTS_I2C
+	help
+	  Enable driver for the FT5336 capacitive touch panel controller.
+
+if KSCAN_FT5336
+
+config KSCAN_FT5336_PERIOD
+	int "Sample period (ms)"
+	default 10
+
+endif # KSCAN_FT5336

drivers/kscan/kscan_ft5336.c

@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2020 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <drivers/kscan.h>
+#include <drivers/i2c.h>
+#include <logging/log.h>
+
+LOG_MODULE_REGISTER(ft5336, CONFIG_KSCAN_LOG_LEVEL);
+
+#define FT5406_DATA_SIZE	0x20
+
+enum ft5336_event {
+	FT5336_EVENT_DOWN	= 0,
+	FT5336_EVENT_UP		= 1,
+	FT5336_EVENT_CONTACT	= 2,
+	FT5336_EVENT_RESERVED	= 3,
+};
+
+struct ft5336_config {
+	char *i2c_name;
+	u8_t i2c_address;
+};
+
+struct ft5336_data {
+	struct device *i2c;
+	kscan_callback_t callback;
+	struct k_work work;
+	struct k_timer timer;
+	struct device *dev;
+};
+
+static int ft5336_read(struct device *dev)
+{
+	const struct ft5336_config *config = dev->config->config_info;
+	struct ft5336_data *data = dev->driver_data;
+	u8_t buffer[FT5406_DATA_SIZE];
+	u8_t event;
+	u16_t row, column;
+	bool pressed;
+
+	if (i2c_burst_read(data->i2c, config->i2c_address, 1, buffer,
+			   sizeof(buffer))) {
+		LOG_ERR("Could not read point");
+		return -EIO;
+	}
+
+	event = buffer[2] >> 6;
+	pressed = (event == FT5336_EVENT_DOWN) ||
+		  (event == FT5336_EVENT_CONTACT);
+
+	row = ((buffer[2] & 0x0f) << 8) | buffer[3];
+	column = ((buffer[4] & 0x0f) << 8) | buffer[5];
+
+	data->callback(dev, row, column, pressed);
+
+	return 0;
+}
+
+static void ft5336_timer_handler(struct k_timer *timer)
+{
+	struct ft5336_data *data =
+		CONTAINER_OF(timer, struct ft5336_data, timer);
+
+	k_work_submit(&data->work);
+}
+
+static void ft5336_work_handler(struct k_work *work)
+{
+	struct ft5336_data *data =
+		CONTAINER_OF(work, struct ft5336_data, work);
+
+	ft5336_read(data->dev);
+}
+
+static int ft5336_configure(struct device *dev, kscan_callback_t callback)
+{
+	struct ft5336_data *data = dev->driver_data;
+
+	if (!callback) {
+		return -EINVAL;
+	}
+
+	data->callback = callback;
+
+	return 0;
+}
+
+static int ft5336_enable_callback(struct device *dev)
+{
+	struct ft5336_data *data = dev->driver_data;
+
+	k_timer_start(&data->timer, K_MSEC(CONFIG_KSCAN_FT5336_PERIOD),
+		      K_MSEC(CONFIG_KSCAN_FT5336_PERIOD));
+
+	return 0;
+}
+
+static int ft5336_disable_callback(struct device *dev)
+{
+	struct ft5336_data *data = dev->driver_data;
+
+	k_timer_stop(&data->timer);
+
+	return 0;
+}
+
+static int ft5336_init(struct device *dev)
+{
+	const struct ft5336_config *config = dev->config->config_info;
+	struct ft5336_data *data = dev->driver_data;
+
+	data->i2c = device_get_binding(config->i2c_name);
+	if (data->i2c == NULL) {
+		LOG_ERR("Could not find I2C device");
+		return -EINVAL;
+	}
+
+	if (i2c_reg_write_byte(data->i2c, config->i2c_address, 0, 0)) {
+		LOG_ERR("Could not enable");
+		return -EINVAL;
+	}
+
+	data->dev = dev;
+
+	k_work_init(&data->work, ft5336_work_handler);
+	k_timer_init(&data->timer, ft5336_timer_handler, NULL);
+
+	return 0;
+}
+
+
+static const struct kscan_driver_api ft5336_driver_api = {
+	.config = ft5336_configure,
+	.enable_callback = ft5336_enable_callback,
+	.disable_callback = ft5336_disable_callback,
+};
+
+static const struct ft5336_config ft5336_config = {
+	.i2c_name = DT_INST_0_FOCALTECH_FT5336_BUS_NAME,
+	.i2c_address = DT_INST_0_FOCALTECH_FT5336_BASE_ADDRESS,
+};
+
+static struct ft5336_data ft5336_data;
+
+DEVICE_AND_API_INIT(ft5336, DT_INST_0_FOCALTECH_FT5336_LABEL, ft5336_init,
+		    &ft5336_data, &ft5336_config,
+		    POST_KERNEL, CONFIG_KSCAN_INIT_PRIORITY,
+		    &ft5336_driver_api);

dts/bindings/kscan/focaltech,ft5336.yaml

@@ -0,0 +1,13 @@
+# Copyright (c) 2020 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+description: FT5336 capacitive touch panel
+
+compatible: "focaltech,ft5336"
+
+include: [kscan.yaml, i2c-device.yaml]
+
+properties:
+    int-gpios:
+      type: phandle-array
+      required: false

dts/bindings/kscan/kscan.yaml

@@ -8,11 +8,5 @@ include: base.yaml
 bus: kscan
 
 properties:
-    "#address-cells":
-      required: true
-      const: 1
-    "#size-cells":
-      type: int
-      const: 0
     label:
       required: true

dts/bindings/kscan/microchip,xec-kscan.yaml

@@ -8,6 +8,12 @@ compatible: "microchip,xec-kscan"
 include: kscan.yaml
 
 properties:
+    "#address-cells":
+      required: true
+      const: 1
+    "#size-cells":
+      type: int
+      const: 0
     reg:
       required: true