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drivers: input: add ft6146 driver
add initial driver for ft6146 Signed-off-by: Qingsong Gou <[email protected]>
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‎drivers/input/CMakeLists.txt‎

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@@ -15,6 +15,7 @@ zephyr_library_sources_ifdef(CONFIG_INPUT_CST816S input_cst816s.c)
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zephyr_library_sources_ifdef(CONFIG_INPUT_CY8CMBR3XXX input_cy8cmbr3xxx.c)
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zephyr_library_sources_ifdef(CONFIG_INPUT_ESP32_TOUCH_SENSOR input_esp32_touch_sensor.c)
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zephyr_library_sources_ifdef(CONFIG_INPUT_FT5336 input_ft5336.c)
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zephyr_library_sources_ifdef(CONFIG_INPUT_FT6146 input_ft6146.c)
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zephyr_library_sources_ifdef(CONFIG_INPUT_GPIO_KBD_MATRIX input_gpio_kbd_matrix.c)
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zephyr_library_sources_ifdef(CONFIG_INPUT_GPIO_KEYS input_gpio_keys.c)
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zephyr_library_sources_ifdef(CONFIG_INPUT_GPIO_QDEC input_gpio_qdec.c)

‎drivers/input/Kconfig‎

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@@ -17,6 +17,7 @@ source "drivers/input/Kconfig.cy8cmbr3xxx"
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source "drivers/input/Kconfig.esp32"
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source "drivers/input/Kconfig.evdev"
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source "drivers/input/Kconfig.ft5336"
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source "drivers/input/Kconfig.ft6146"
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source "drivers/input/Kconfig.gpio_kbd_matrix"
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source "drivers/input/Kconfig.gpio_keys"
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source "drivers/input/Kconfig.gpio_qdec"

‎drivers/input/Kconfig.ft6146‎

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# Copyright (c) 2025 Qingsong Gou <[email protected]>
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# SPDX-License-Identifier: Apache-2.0
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menuconfig INPUT_FT6146
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bool "FT6146 touch controller"
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default y
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depends on DT_HAS_FOCALTECH_FT6146_ENABLED
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select I2C
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help
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Enable driver for FT6146 capacitive touch controller.
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if INPUT_FT6146
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config INPUT_FT6416_PERIOD
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int "Sample period"
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depends on !INPUT_FT6146_INTERRUPT
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default 10
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help
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Sample period in milliseconds when in polling mode.
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config INPUT_FT6146_INTERRUPT
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bool "FT6146 interrupt support"
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default y if $(dt_compat_any_has_prop,$(DT_COMPAT_FOCALTECH_FT56146),int-gpios)
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help
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Enable interrupt support for the FT6146 touch controller.
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endif # INPUT_FT6146

‎drivers/input/input_ft6146.c‎

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/*
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* Copyright (c) 2025 Qingsong Gou <[email protected]>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT focaltech_ft6146
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/input/input.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(ft6146, CONFIG_INPUT_LOG_LEVEL);
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/* FT6146 register definitions */
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#define FT6146_REG_DEVICE_MODE 0x00
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#define FT6146_REG_GEST_ID 0x01
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#define FT6146_REG_TD_STATUS 0x02
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#define FT6146_REG_P1_XH 0x03
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#define FT6146_REG_P1_XL 0x04
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#define FT6146_REG_P1_YH 0x05
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#define FT6146_REG_P1_YL 0x06
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#define FT6146_REG_P1_WEIGHT 0x07
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#define FT6146_REG_P1_MISC 0x08
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#define FT6146_REG_P2_XH 0x09
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#define FT6146_REG_P2_XL 0x0A
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#define FT6146_REG_P2_YH 0x0B
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#define FT6146_REG_P2_YL 0x0C
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#define FT6146_REG_P2_WEIGHT 0x0D
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#define FT6146_REG_P2_MISC 0x0E
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#define FT6146_REG_THRESHOLD 0x80
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#define FT6146_REG_FILTER_COE 0x85
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#define FT6146_REG_CTRL 0x86
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#define FT6146_REG_TIMEENTERMONITOR 0x87
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#define FT6146_REG_PERIODACTIVE 0x88
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#define FT6146_REG_PERIODMONITOR 0x89
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#define FT6146_REG_RADIAN_VALUE 0x91
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#define FT6146_REG_OFFSET_LEFT_RIGHT 0x92
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#define FT6146_REG_OFFSET_UP_DOWN 0x93
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#define FT6146_REG_DIST_LEFT_RIGHT 0x94
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#define FT6146_REG_DIST_UP_DOWN 0x95
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#define FT6146_REG_ZOOM_DIS_SQR 0x96
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#define FT6146_REG_RADIAN_THRESHOLD 0x97
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#define FT6146_REG_SMALL_OBJECT_THRESHOLD 0x98
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/* Device mode values */
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#define FT6146_DEVICE_MODE_NORMAL 0x00
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#define FT6146_DEVICE_MODE_TEST 0x04
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#define FT6146_DEVICE_MODE_SYSTEM 0x01
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/* Gesture IDs */
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#define FT6146_GESTURE_NO_GESTURE 0x00
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#define FT6146_GESTURE_MOVE_UP 0x10
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#define FT6146_GESTURE_MOVE_RIGHT 0x14
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#define FT6146_GESTURE_MOVE_DOWN 0x18
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#define FT6146_GESTURE_MOVE_LEFT 0x1C
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#define FT6146_GESTURE_ZOOM_IN 0x48
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#define FT6146_GESTURE_ZOOM_OUT 0x49
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/* Reset timing */
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#define FT6146_RESET_DELAY_MS 10
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#define FT6146_POST_RESET_DELAY_MS 100
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#define MAX_POINT_NUM 2
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#define FT6146_READ_ID_H (0xA3)
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#define FT6146_READ_ID_L (0x9F)
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struct ft6146_data {
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const struct device *dev;
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const struct device *int_gpio;
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struct gpio_callback int_cb;
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struct k_work work;
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struct k_timer poll_timer;
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uint8_t i2c_addr;
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uint16_t x_max;
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uint16_t y_max;
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bool gesture_enabled;
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bool last_touch_state;
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};
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struct ft6146_config {
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struct i2c_dt_spec i2c;
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struct gpio_dt_spec int_gpio;
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struct gpio_dt_spec reset_gpio;
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uint16_t x_max;
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uint16_t y_max;
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bool gesture_enabled;
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};
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static void ft6146_process_touch(const struct device *dev, uint8_t status)
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{
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const struct ft6146_config *config = dev->config;
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uint8_t point_data[14];
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uint8_t touch_num = 0;
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uint8_t event_flag = 0;
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uint16_t x, y;
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int id = 0;
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int ret;
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/* Read touch data */
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ret = i2c_burst_read_dt(&config->i2c, FT6146_REG_GEST_ID, point_data, sizeof(point_data));
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if (ret < 0) {
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LOG_ERR("Failed to read touch data: %d", ret);
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return;
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}
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touch_num = point_data[1] & 0x0f;
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LOG_DBG("%s:touch_num:%d", __func__, touch_num);
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if (touch_num > MAX_POINT_NUM) {
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return;
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} else {
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for (int i = 0; i < touch_num; i++) {
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event_flag = (point_data[2 + i * 6] >> 6) & 0x03;
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id = point_data[4 + i * 6] >> 4;
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x = ((point_data[2 + i * 6] & 0x0F) << 8) + point_data[3 + i * 6];
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y = ((point_data[4 + i * 6] & 0x0F) << 8) + point_data[5 + i * 6];
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LOG_DBG("%s %d :event_flag:%d, id:%d, x:%d, y:%d", __func__, __LINE__, event_flag, id, x, y);
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}
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}
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}
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static void ft6146_work_handler(struct k_work *work)
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{
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struct ft6146_data *data = CONTAINER_OF(work, struct ft6146_data, work);
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const struct device *dev = data->dev;
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ft6146_process_touch(dev, 0);
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}
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#ifndef CONFIG_INPUT_FT6146_INTERRUPT
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static void ft6146_poll_timer_handler(struct k_timer *timer)
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{
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struct ft6146_data *data = CONTAINER_OF(timer, struct ft6146_data, poll_timer);
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k_work_submit(&data->work);
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}
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#else
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static void ft6146_isr_handler(const struct device *dev, struct gpio_callback *cb,
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uint32_t pins)
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{
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struct ft6146_data *data = CONTAINER_OF(cb, struct ft6146_data, int_cb);
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k_work_submit(&data->work);
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}
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#endif
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static int ft6146_reset(const struct device *dev)
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{
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const struct ft6146_config *config = dev->config;
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int ret;
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if (!config->reset_gpio.port) {
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return 0;
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}
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/* Assert reset */
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ret = gpio_pin_set_dt(&config->reset_gpio, 0);
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if (ret < 0) {
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LOG_ERR("Failed to assert reset: %d", ret);
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return ret;
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}
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k_msleep(FT6146_RESET_DELAY_MS);
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/* De-assert reset */
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ret = gpio_pin_set_dt(&config->reset_gpio, 1);
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if (ret < 0) {
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LOG_ERR("Failed to de-assert reset: %d", ret);
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return ret;
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}
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k_msleep(FT6146_POST_RESET_DELAY_MS);
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return 0;
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}
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static int ft6146_init(const struct device *dev)
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{
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const struct ft6146_config *config = dev->config;
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struct ft6146_data *data = dev->data;
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int ret;
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uint8_t id;
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/* Initialize I2C */
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if (!device_is_ready(config->i2c.bus)) {
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LOG_ERR("I2C bus not ready");
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return -ENODEV;
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}
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data->dev = dev;
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/* Initialize reset GPIO if present */
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if (config->reset_gpio.port) {
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if (!device_is_ready(config->reset_gpio.port)) {
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LOG_ERR("Reset GPIO not ready");
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return -ENODEV;
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}
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ret = gpio_pin_configure_dt(&config->reset_gpio, GPIO_OUTPUT_INACTIVE);
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if (ret < 0) {
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LOG_ERR("Failed to configure reset GPIO: %d", ret);
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return ret;
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}
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/* Perform reset sequence */
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ret = ft6146_reset(dev);
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if (ret < 0) {
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return ret;
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}
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}
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ret = i2c_reg_read_byte_dt(&config->i2c, FT6146_READ_ID_H, &id);
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if (ret < 0) {
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LOG_ERR("Failed to read ID_H: %d", ret);
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return ret;
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}
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LOG_INF("ft6146 chip ID: 0x%x", id);
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ret = i2c_reg_read_byte_dt(&config->i2c, FT6146_READ_ID_L, &id);
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if (ret < 0) {
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LOG_ERR("Failed to read ID_L: %d", ret);
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return ret;
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}
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LOG_INF("ft6146 chip ID: 0x%x", id);
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#ifdef CONFIG_INPUT_FT6146_INTERRUPT
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ret = gpio_pin_configure_dt(&config->int_gpio, GPIO_INPUT);
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if (ret < 0) {
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LOG_ERR("Failed to configure interrupt GPIO: %d", ret);
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return ret;
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}
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ret = gpio_pin_interrupt_configure_dt(&config->int_gpio, GPIO_INT_EDGE_TO_ACTIVE);
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if (ret < 0) {
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LOG_ERR("Failed to configure interrupt: %d", ret);
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return ret;
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}
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gpio_init_callback(&data->int_cb, ft6146_isr_handler, BIT(config->int_gpio.pin));
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ret = gpio_add_callback(config->int_gpio.port, &data->int_cb);
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if (ret < 0) {
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LOG_ERR("Failed to add callback: %d", ret);
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return ret;
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}
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#else
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/* Initialize polling timer */
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k_timer_init(&data->poll_timer, ft6146_poll_timer_handler, NULL);
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k_timer_start(&data->poll_timer, K_MSEC(CONFIG_INPUT_FT6416_PERIOD),
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K_MSEC(CONFIG_INPUT_FT6416_PERIOD));
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#endif
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/* Initialize work queue */
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k_work_init(&data->work, ft6146_work_handler);
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LOG_INF("FT6146 initialized");
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return 0;
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}
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#define FT6146_INIT(n) \
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static struct ft6146_data ft6146_data_##n; \
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\
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static const struct ft6146_config ft6146_config_##n = { \
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.i2c = I2C_DT_SPEC_INST_GET(n), \
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.reset_gpio = GPIO_DT_SPEC_INST_GET_OR(n, reset_gpios, {0}), \
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COND_CODE_1(CONFIG_INPUT_FT6146_INTERRUPT, \
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(.int_gpio = GPIO_DT_SPEC_INST_GET(n, int_gpios),), ()) \
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}; \
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\
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DEVICE_DT_INST_DEFINE(n, ft6146_init, NULL, \
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&ft6146_data_##n, \
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&ft6146_config_##n, \
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POST_KERNEL, \
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CONFIG_INPUT_INIT_PRIORITY, \
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NULL);
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DT_INST_FOREACH_STATUS_OKAY(FT6146_INIT)

‎dts/bindings/input/focaltech,ft6146.yaml‎

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description: FocalTech FT6146 capacitive touch controller
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compatible: "focaltech,ft6146"
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include: i2c-device.yaml
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properties:
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reg:
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required: true
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description: I2C address of the FT6146 (typically 0x38)
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int-gpios:
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type: phandle-array
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required: false
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description: Interrupt GPIO specification, active low
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reset-gpios:
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type: phandle-array
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required: false
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description: Reset GPIO specification, active low

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