drivers: input: sbus remote controller support

Add support SBUS RC controller connected through UART

Signed-off-by: Peter van der Perk <[email protected]>

Author: PetervdPerk-NXP

boards/nxp/vmu_rt1170/doc/index.rst

@@ -61,6 +61,10 @@ Hardware
 
 - CAN bus JST-GH connectors
 
+- RC IN
+
+  - RC input connector for SBUS compatible RC receivers
+
 For more information about the MIMXRT1176 SoC and VMU RT1170 board, see
 these references:
 

boards/nxp/vmu_rt1170/vmu_rt1170_mimxrt1176_cm7.dts

@@ -170,6 +170,41 @@
 	current-speed = <115200>;
 };
 
+&lpuart6 {
+	status = "okay";
+	single-wire;
+	rx-invert;
+
+	sbus {
+		compatible = "futaba,sbus";
+		right_stick_x {
+			channel = <1>;
+			type = <INPUT_EV_ABS>;
+			zephyr,code = <INPUT_ABS_RX>;
+		};
+		right_stick_y {
+			channel = <2>;
+			type = <INPUT_EV_ABS>;
+			zephyr,code = <INPUT_ABS_RY>;
+		};
+		left_stick_y {
+			channel = <3>;
+			type = <INPUT_EV_ABS>;
+			zephyr,code = <INPUT_ABS_Y>;
+		};
+		left_stick_x {
+			channel = <4>;
+			type = <INPUT_EV_ABS>;
+			zephyr,code = <INPUT_ABS_X>;
+		};
+		kill_switch {
+			channel = <5>;
+			type = <INPUT_EV_KEY>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+};
+
 
 &flexcan1 {
 	status = "okay";

drivers/input/CMakeLists.txt

@@ -24,6 +24,7 @@ zephyr_library_sources_ifdef(CONFIG_INPUT_PAT912X input_pat912x.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_PAW32XX input_paw32xx.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_PINNACLE input_pinnacle.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_PMW3610 input_pmw3610.c)
+zephyr_library_sources_ifdef(CONFIG_INPUT_SBUS input_sbus.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_STMPE811 input_stmpe811.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_XEC_KBD input_xec_kbd.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_XPT2046 input_xpt2046.c)

drivers/input/Kconfig

@@ -26,6 +26,7 @@ source "drivers/input/Kconfig.pat912x"
 source "drivers/input/Kconfig.paw32xx"
 source "drivers/input/Kconfig.pinnacle"
 source "drivers/input/Kconfig.pmw3610"
+source "drivers/input/Kconfig.sbus"
 source "drivers/input/Kconfig.sdl"
 source "drivers/input/Kconfig.stmpe811"
 source "drivers/input/Kconfig.xec"

drivers/input/Kconfig.sbus

@@ -0,0 +1,54 @@
+# Copyright (c) 2024 NXP Semiconductors
+# SPDX-License-Identifier: Apache-2.0
+
+config INPUT_SBUS
+	bool "SBUS driver"
+	default y
+	depends on DT_HAS_FUTABA_SBUS_ENABLED
+	depends on UART_INTERRUPT_DRIVEN
+	select UART_USE_RUNTIME_CONFIGURE
+	help
+	  Enable driver for SBUS Remote controller.
+
+if INPUT_SBUS
+
+config INPUT_SBUS_THREAD_STACK_SIZE
+	int "Stack size for the sbus thread"
+	default 1024
+	help
+	  Size of the stack used for the sbus thread.
+
+config INPUT_SBUS_THREAD_PRIORITY
+	int "Priority for the sbus thread"
+	default 0
+	help
+	  Priority level of the sbus thread.
+
+config INPUT_SBUS_REPORT_FILTER
+	int "Minimal change in signal to report"
+	default 1
+	help
+	  SBUS tends to be a bit noisy you can increase the threshold to
+	  to lower the amounts of input events. Set to 0 for no filtering
+
+config INPUT_SBUS_SEND_SYNC
+	bool "Send Sync to input subsys on each SBUS frame"
+	default y
+	help
+	  Sends sync message to input subsys with sync bit.
+
+config INPUT_SBUS_CHANNEL_VALUE_ONE
+	int "Threshold value > for INPUT_EV_KEY value 1"
+	default 1800
+	help
+	  SBUS sends analogue values for digital switches. This config value
+	  sets the threshold to interperted the analogue value as an logic 1
+
+config INPUT_SBUS_CHANNEL_VALUE_ZERO
+	int "Threshold value < for INPUT_EV_KEY value 0"
+	default 1200
+	help
+	  SBUS sends analogue values for digital switches. This config value
+	  sets the threshold to interperted the analogue value as an logic 0
+
+endif # INPUT_SBUS