tests: input: add a gpio-kbd-matrix test suite

Add an initial test suite for the gpio-kbd-matrix driver.

Signed-off-by: Fabio Baltieri <[email protected]>

tests/drivers/input/gpio_kbd_matrix/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(input_gpio_kbd_matrix)
+
+target_include_directories(app PRIVATE ${ZEPHYR_BASE}/drivers/input)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/drivers/input/gpio_kbd_matrix/Kconfig

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+# Copyright 2023 Google LLC
+# SPDX-License-Identifier: Apache-2.0
+
+config INPUT_KBD_DRIVE_COLUMN_HOOK
+	default y
+
+source "Kconfig.zephyr"

tests/drivers/input/gpio_kbd_matrix/boards/native_sim.overlay

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+/*
+ * Copyright 2023 Google LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&gpio0 {
+        ngpios = <12>;
+};
+
+/ {
+	kbd_matrix_interrupt: kbd-matrix-interrupt {
+		compatible = "gpio-kbd-matrix";
+		row-gpios = <&gpio0 0 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
+			    <&gpio0 1 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+		col-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>,
+			    <&gpio0 3 GPIO_ACTIVE_LOW>;
+		debounce-down-ms = <80>;
+		debounce-up-ms = <40>;
+		poll-timeout-ms = <500>;
+	};
+
+	kbd_matrix_poll: kbd-matrix-poll {
+		compatible = "gpio-kbd-matrix";
+		row-gpios = <&gpio0 4 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
+			    <&gpio0 5 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+		col-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>,
+			    <&gpio0 7 GPIO_ACTIVE_LOW>;
+		debounce-down-ms = <40>;
+		debounce-up-ms = <80>;
+		poll-timeout-ms = <500>;
+		idle-mode = "poll";
+		col-drive-inactive;
+	};
+
+	kbd_matrix_scan: kbd-matrix-scan {
+		compatible = "gpio-kbd-matrix";
+		/* pins out of sequence to test non direct read */
+		row-gpios = <&gpio0 9 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
+			    <&gpio0 8 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+		col-gpios = <&gpio0 11 GPIO_ACTIVE_LOW>,
+			    <&gpio0 10 GPIO_ACTIVE_LOW>;
+		debounce-down-ms = <80>;
+		debounce-up-ms = <40>;
+		poll-timeout-ms = <0>;
+		col-drive-inactive;
+		idle-mode = "scan";
+	};
+};

tests/drivers/input/gpio_kbd_matrix/boards/native_sim_64.overlay

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+/*
+ * Copyright 2023 Google LLC
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "native_sim.overlay"

tests/drivers/input/gpio_kbd_matrix/prj.conf

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+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_ZTEST=y
+CONFIG_GPIO=y
+CONFIG_INPUT=y
+CONFIG_INPUT_MODE_SYNCHRONOUS=y