driver: input: added input_tsc_keys

input_tsc_keys to detect key press releases
using STM32 TSC

Signed-off-by: Arif Balik <[email protected]>

Author: arifbalik

boards/st/stm32u083c_dk/stm32u083c_dk.dts

@@ -146,5 +146,11 @@
 		group = <6>;
 		channel-ios = <TSC_IO2>;
 		sampling-io = <TSC_IO1>;
+		ts1 {
+			compatible = "tsc-keys";
+			sampling-interval-ms = <10>;
+			noise-threshold = <50>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
 	};
 };

drivers/input/CMakeLists.txt

@@ -28,6 +28,7 @@ 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_STM32_TSC_KEYS input_tsc_keys.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_STMPE811 input_stmpe811.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_TOUCH input_touch.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_XEC_KBD input_xec_kbd.c)

drivers/input/Kconfig

@@ -33,6 +33,7 @@ source "drivers/input/Kconfig.sbus"
 source "drivers/input/Kconfig.sdl"
 source "drivers/input/Kconfig.stmpe811"
 source "drivers/input/Kconfig.touch"
+source "drivers/input/Kconfig.tsc_keys"
 source "drivers/input/Kconfig.xec"
 source "drivers/input/Kconfig.xpt2046"
 # zephyr-keep-sorted-stop

drivers/input/Kconfig.tsc_keys

@@ -0,0 +1,21 @@
+# Copyright (c) 2024 Arif Balik <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+config INPUT_STM32_TSC_KEYS
+	bool "STM32 TSC touch library"
+	default y
+	depends on DT_HAS_ST_STM32_TSC_ENABLED
+	select RING_BUFFER
+	help
+	  Enable support for STM32 TSC touch library.
+
+config INPUT_STM32_TSC_KEYS_BUFFER_WORD_SIZE
+	int "STM32 TSC touch buffer size in words"
+	default 10
+	depends on INPUT_STM32_TSC_KEYS
+	help
+	  Size of the ring buffer for the STM32 TSC touch library. The size of this
+	  buffer together with the sampling-interval property in the tsc-keys
+	  device tree node determines the time window of interest. A slope value is
+	  calculated between the oldest and the newest value in the buffer to
+	  generate a press or release input event.