drivers: input: ili2132a: add support for ili2132a touch controller

This commit adds basic ili2132a touch controller driver.

Signed-off-by: Joel Jaldemark <joeljaldemark@outlook.com>

drivers/input/CMakeLists.txt

@@ -17,6 +17,7 @@ zephyr_library_sources_ifdef(CONFIG_INPUT_GPIO_KBD_MATRIX input_gpio_kbd_matrix.
 zephyr_library_sources_ifdef(CONFIG_INPUT_GPIO_KEYS input_gpio_keys.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_GPIO_QDEC input_gpio_qdec.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_GT911 input_gt911.c)
+zephyr_library_sources_ifdef(CONFIG_INPUT_ILI2132A input_ili2132a.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_ITE_IT8XXX2_KBD input_ite_it8xxx2_kbd.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_KBD_MATRIX input_kbd_matrix.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_NPCX_KBD input_npcx_kbd.c)

drivers/input/Kconfig

@@ -19,6 +19,7 @@ source "drivers/input/Kconfig.gpio_kbd_matrix"
 source "drivers/input/Kconfig.gpio_keys"
 source "drivers/input/Kconfig.gpio_qdec"
 source "drivers/input/Kconfig.gt911"
+source "drivers/input/Kconfig.ili2132a"
 source "drivers/input/Kconfig.it8xxx2"
 source "drivers/input/Kconfig.kbd_matrix"
 source "drivers/input/Kconfig.npcx"

drivers/input/Kconfig.ili2132a

@@ -0,0 +1,10 @@
+# Copyright (c) 2024 Joel Jaldemark
+# SPDX-License-Identifier: Apache-2.0
+
+config INPUT_ILI2132A
+	bool "ILI2132A capacitive touch controller driver"
+	default y
+	depends on DT_HAS_ILITEK_ILI2132A_ENABLED
+	select I2C
+	help
+	  Enable driver for ilitek ili2132a touch controller

drivers/input/input_ili2132a.c

@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2024 Joel Jaldemark
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT ilitek_ili2132a
+
+#include <zephyr/drivers/gpio.h>
+#include <zephyr/drivers/i2c.h>
+#include <zephyr/input/input.h>
+#include <zephyr/pm/device.h>
+#include <zephyr/sys/byteorder.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(ili2132a, CONFIG_INPUT_LOG_LEVEL);
+
+#define IS_TOUCHED_BIT 0x40
+#define TIP            1
+#define X_COORD        2
+#define Y_COORD        4
+
+struct ili2132a_data {
+	const struct device *dev;
+	struct gpio_callback gpio_cb;
+	struct k_work work;
+};
+
+struct ili2132a_config {
+	struct i2c_dt_spec i2c;
+	struct gpio_dt_spec rst;
+	struct gpio_dt_spec irq;
+};
+
+static void gpio_isr(const struct device *dev, struct gpio_callback *cb, uint32_t pin)
+{
+	struct ili2132a_data *data = CONTAINER_OF(cb, struct ili2132a_data, gpio_cb);
+
+	k_work_submit(&data->work);
+}
+
+static void ili2132a_process(const struct device *dev)
+{
+	const struct ili2132a_config *dev_cfg = dev->config;
+	uint8_t buf[8];
+	uint16_t x, y;
+
+	i2c_read_dt(&dev_cfg->i2c, buf, sizeof(buf));
+	if (buf[TIP] & IS_TOUCHED_BIT) {
+		x = sys_get_le16(&buf[X_COORD]);
+		y = sys_get_le16(&buf[Y_COORD]);
+		input_report_abs(dev, INPUT_ABS_X, x, false, K_FOREVER);
+		input_report_abs(dev, INPUT_ABS_Y, y, false, K_FOREVER);
+		input_report_key(dev, INPUT_BTN_TOUCH, 1, true, K_FOREVER);
+	} else {
+		input_report_key(dev, INPUT_BTN_TOUCH, 0, true, K_FOREVER);
+	}
+}
+
+static void ili2132a_work_handler(struct k_work *work_item)
+{
+	struct ili2132a_data *data = CONTAINER_OF(work_item, struct ili2132a_data, work);
+
+	ili2132a_process(data->dev);
+}
+
+static int ili2132a_init(const struct device *dev)
+{
+	struct ili2132a_data *data = dev->data;
+	const struct ili2132a_config *dev_cfg = dev->config;
+	int ret;
+
+	if (!i2c_is_ready_dt(&dev_cfg->i2c)) {
+		LOG_ERR("%s is not ready", dev_cfg->i2c.bus->name);
+		return -ENODEV;
+	}
+
+	if (!gpio_is_ready_dt(&dev_cfg->rst)) {
+		LOG_ERR("Reset GPIO controller device not ready");
+		return -ENODEV;
+	}
+
+	if (!gpio_is_ready_dt(&dev_cfg->irq)) {
+		LOG_ERR("Interrupt GPIO controller device not ready");
+		return -ENODEV;
+	}
+
+	data->dev = dev;
+
+	ret = gpio_pin_configure_dt(&dev_cfg->irq, GPIO_INPUT);
+	if (ret < 0) {
+		LOG_ERR("Could not configure interrupt gpio");
+		return ret;
+	}
+
+	ret = gpio_pin_configure_dt(&dev_cfg->rst, GPIO_OUTPUT_ACTIVE);
+	if (ret < 0) {
+		LOG_ERR("Could not configure reset gpio");
+		return ret;
+	}
+
+	ret = gpio_pin_set_dt(&dev_cfg->rst, 0);
+	if (ret < 0) {
+		return ret;
+	}
+
+	gpio_init_callback(&data->gpio_cb, gpio_isr, BIT(dev_cfg->irq.pin));
+	ret = gpio_add_callback(dev_cfg->irq.port, &data->gpio_cb);
+	if (ret < 0) {
+		LOG_ERR("Could not set gpio callback");
+		return ret;
+	}
+
+	ret = gpio_pin_interrupt_configure_dt(&dev_cfg->irq, GPIO_INT_EDGE_FALLING);
+	if (ret < 0) {
+		LOG_ERR("Could not configure interrupt");
+		return ret;
+	}
+
+	k_work_init(&data->work, ili2132a_work_handler);
+
+	return 0;
+}
+#define ILI2132A_INIT(index)                                                                       \
+	static const struct ili2132a_config ili2132a_config_##index = {                            \
+		.i2c = I2C_DT_SPEC_INST_GET(index),                                                \
+		.rst = GPIO_DT_SPEC_INST_GET(index, rst_gpios),                                    \
+		.irq = GPIO_DT_SPEC_INST_GET(index, irq_gpios),                                    \
+	};                                                                                         \
+	static struct ili2132a_data ili2132a_data_##index;                                         \
+	DEVICE_DT_INST_DEFINE(index, ili2132a_init, NULL, &ili2132a_data_##index,                  \
+			      &ili2132a_config_##index, POST_KERNEL, CONFIG_INPUT_INIT_PRIORITY,   \
+			      NULL);
+
+DT_INST_FOREACH_STATUS_OKAY(ILI2132A_INIT)

dts/bindings/input/ilitek,ili2132a.yaml

@@ -0,0 +1,21 @@
+# Copyright (c) 2024 Joel Jaldemark
+# SPDX-License-Identifier: Apache-2.0
+
+description: ILI2132A capacitive touch controller
+
+compatible: "ilitek,ili2132a"
+
+include: i2c-device.yaml
+
+properties:
+  irq-gpios:
+    type: phandle-array
+    required: true
+    description: |
+      Interrupt pin
+
+  rst-gpios:
+    type: phandle-array
+    required: true
+    description: |
+      Reset pin

tests/drivers/build_all/input/app.overlay

@@ -261,6 +261,14 @@
 				primary-tap-enable;
 				swap-xy;
 			};
+
+			touch_dev: ili2132a@41 {
+				compatible = "ilitek,ili2132a";
+				reg = <0x41>;
+				irq-gpios = <&test_gpio 0 0>;
+				rst-gpios = <&test_gpio 1 0>;
+			};
+
 		};
 
 		spi@2 {