448 lines
12 KiB
C
448 lines
12 KiB
C
/*
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* Copyright (c) 2021 Abel Sensors
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <drivers/gpio.h>
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#include <drivers/i2c.h>
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#include "gpio_utils.h"
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#include <logging/log.h>
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LOG_MODULE_REGISTER(fxl6408, CONFIG_FXL6408_LOG_LEVEL);
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#define DT_DRV_COMPAT fcs_fxl6408
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/* Register definitions */
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#define REG_DEVICE_ID_CTRL 0x01
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#define REG_DIRECTION 0x03
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#define REG_OUTPUT 0x05
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#define REG_OUTPUT_HIGH_Z 0x07
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#define REG_INPUT_DEFAULT_STATE 0x09
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#define REG_PUD_EN 0x0B
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#define REG_PUD_SEL 0x0D
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#define REG_INPUT_VALUE 0x0F
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#define REG_INT_MASK 0x11
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#define REG_INT_STATUS 0x13
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#define SUPPORTED_FLAGS (GPIO_INPUT | GPIO_OUTPUT | GPIO_OUTPUT_INIT_LOW |\
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GPIO_OUTPUT_INIT_HIGH | GPIO_PULL_DOWN | GPIO_PULL_UP |\
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GPIO_ACTIVE_HIGH | GPIO_ACTIVE_LOW | GPIO_INT_DEBOUNCE)
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/** Configuration data*/
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struct gpio_fxl6408_config {
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/* gpio_driver_config needs to be first */
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struct gpio_driver_config common;
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/** Master I2C device */
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const struct device *i2c_master;
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/** The slave address of the chip */
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uint16_t i2c_slave_addr;
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};
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/** Runtime driver data */
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struct gpio_fxl6408_drv_data {
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/* gpio_driver_data needs to be first */
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struct gpio_driver_data common;
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struct {
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uint8_t input;
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uint8_t output;
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uint8_t dir;
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uint8_t high_z;
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uint8_t pud_en;
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uint8_t pud_sel;
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} reg_cache;
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struct k_sem lock;
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};
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/**
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* @brief Read the port of certain register function.
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*
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* @param dev Device struct of the FXL6408.
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* @param reg Register to read.
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* @param cache Pointer to the cache to be updated after successful read.
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*
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* @return 0 if successful, failed otherwise.
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*/
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static int read_port_regs(const struct device *dev, uint8_t reg, uint8_t *cache)
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{
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const struct gpio_fxl6408_config *const config = dev->config;
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const struct device *i2c_master = config->i2c_master;
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uint16_t i2c_addr = config->i2c_slave_addr;
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uint8_t port_data;
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int ret;
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ret = i2c_reg_read_byte(i2c_master, i2c_addr, reg, &port_data);
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if (ret != 0) {
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LOG_ERR("Error reading register 0x%X (%d)", reg, ret);
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return ret;
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}
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*cache = port_data;
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LOG_DBG("Read: REG[0x%X] = 0x%X", reg, *cache);
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return ret;
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}
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/**
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* @brief Write to the port registers of certain register function.
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*
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* @param dev Device struct of the FXL6408.
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* @param reg Register to write into. Possible values: REG_DEVICE_ID_CTRL,
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* REG_OUTPUT, REG_DIRECTION, REG_PUD_SEL, REG_PUD_EN, REG_OUTPUT_HIGH_Z and
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* REG_INPUT_DEFAULT.
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* @param cache Pointer to the cache to be updated after successful write.
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* @param value New value to set.
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*
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* @return 0 if successful, failed otherwise.
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*/
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static int write_port_regs(const struct device *dev, uint8_t reg,
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uint8_t *cache, uint8_t value)
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{
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const struct gpio_fxl6408_config *const config = dev->config;
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const struct device *i2c_master = config->i2c_master;
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int ret = 0;
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if (*cache != value) {
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ret = i2c_reg_write_byte(i2c_master, config->i2c_slave_addr,
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reg, value);
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if (ret != 0) {
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LOG_ERR("error writing to register 0x%X (%d)",
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reg, ret);
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return ret;
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}
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*cache = value;
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LOG_DBG("Write: REG[0x%X] = 0x%X", reg, *cache);
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}
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return ret;
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}
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static inline int update_input_regs(const struct device *dev, uint8_t *buf)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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int ret = read_port_regs(dev, REG_INPUT_VALUE,
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&drv_data->reg_cache.input);
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*buf = drv_data->reg_cache.input;
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return ret;
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}
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static inline int update_output_regs(const struct device *dev, uint8_t value)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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return write_port_regs(dev, REG_OUTPUT,
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&drv_data->reg_cache.output, value);
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}
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static inline int update_high_z_regs(const struct device *dev, uint8_t value)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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return write_port_regs(dev, REG_OUTPUT_HIGH_Z,
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&drv_data->reg_cache.high_z, value);
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}
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static inline int update_direction_regs(const struct device *dev, uint8_t value)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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return write_port_regs(dev, REG_DIRECTION,
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&drv_data->reg_cache.dir, value);
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}
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static inline int update_pul_sel_regs(const struct device *dev, uint8_t value)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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return write_port_regs(dev, REG_PUD_SEL,
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&drv_data->reg_cache.pud_sel, value);
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}
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static inline int update_pul_en_regs(const struct device *dev, uint8_t value)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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return write_port_regs(dev, REG_PUD_EN,
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&drv_data->reg_cache.pud_en, value);
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}
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static int setup_pin_dir(const struct device *dev, uint32_t pin, int flags)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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uint8_t reg_dir = drv_data->reg_cache.dir;
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uint8_t reg_out = drv_data->reg_cache.output;
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uint8_t reg_high_z = drv_data->reg_cache.high_z;
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int ret;
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if (((flags & GPIO_INPUT) != 0) && ((flags & GPIO_OUTPUT) != 0)) {
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return -ENOTSUP;
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}
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/* Update the driver data to the actual situation of the FXL6408 */
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if (flags & GPIO_OUTPUT) {
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if ((flags & GPIO_OUTPUT_INIT_HIGH)) {
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reg_out |= BIT(pin);
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} else if ((flags & GPIO_OUTPUT_INIT_LOW)) {
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reg_out &= ~BIT(pin);
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}
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reg_dir |= BIT(pin);
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reg_high_z &= ~BIT(pin);
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} else if (flags & GPIO_INPUT) {
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reg_dir &= ~BIT(pin);
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reg_high_z &= ~BIT(pin);
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} else {
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reg_high_z |= BIT(pin);
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reg_dir |= BIT(pin);
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}
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ret = update_output_regs(dev, reg_out);
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if (ret != 0) {
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return ret;
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}
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ret = update_high_z_regs(dev, reg_high_z);
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if (ret != 0) {
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return ret;
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}
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ret = update_direction_regs(dev, reg_dir);
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return ret;
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}
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/**
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* @brief Setup the pin pull up/pull down status
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*
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* @param dev Device struct of the FXL6408
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* @param pin The pin number
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* @param flags Flags of pin or port
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*
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* @return 0 if successful, failed otherwise
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*/
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static int setup_pin_pullupdown(const struct device *dev, uint32_t pin,
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int flags)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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uint8_t reg_pud;
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int ret;
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/* If disabling pull up/down, there is no need to set the selection
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* register. Just go straight to disabling.
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*/
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if ((flags & (GPIO_PULL_UP | GPIO_PULL_DOWN)) != 0U) {
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/* Setup pin pull up or pull down */
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reg_pud = drv_data->reg_cache.pud_sel;
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/* Pull down == 0, pull up == 1 */
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WRITE_BIT(reg_pud, pin, (flags & GPIO_PULL_UP) != 0U);
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ret = update_pul_sel_regs(dev, reg_pud);
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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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/* Enable/disable pull up/down */
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reg_pud = drv_data->reg_cache.pud_en;
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WRITE_BIT(reg_pud, pin,
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(flags & (GPIO_PULL_UP | GPIO_PULL_DOWN)) != 0U);
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ret = update_pul_en_regs(dev, reg_pud);
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return ret;
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}
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static int gpio_fxl6408_pin_config(const struct device *dev, gpio_pin_t pin,
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gpio_flags_t flags)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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int ret;
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/* Check if supported flag is set */
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if ((flags & ~SUPPORTED_FLAGS) != 0) {
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return -ENOTSUP;
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}
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/* Can't do I2C bus operations from an ISR */
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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k_sem_take(&drv_data->lock, K_FOREVER);
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ret = setup_pin_dir(dev, pin, flags);
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if (ret != 0) {
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LOG_ERR("error setting pin direction (%d)", ret);
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goto done;
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}
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ret = setup_pin_pullupdown(dev, pin, flags);
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if (ret) {
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LOG_ERR("error setting pin pull up/down (%d)", ret);
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goto done;
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}
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done:
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k_sem_give(&drv_data->lock);
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return ret;
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}
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static int gpio_fxl6408_port_get_raw(const struct device *dev, uint32_t *value)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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uint8_t buf = 0;
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int ret = 0;
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/* Can't do I2C bus operations from an ISR */
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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k_sem_take(&drv_data->lock, K_FOREVER);
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ret = update_input_regs(dev, &buf);
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if (ret != 0) {
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goto done;
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}
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*value = buf;
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done:
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k_sem_give(&drv_data->lock);
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return ret;
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}
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static int gpio_fxl6408_port_set_masked_raw(const struct device *dev,
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uint32_t mask, uint32_t value)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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uint8_t reg_out;
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int ret;
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/* Can't do I2C bus operations from an ISR */
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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k_sem_take(&drv_data->lock, K_FOREVER);
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reg_out = drv_data->reg_cache.output;
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reg_out = (reg_out & ~mask) | (mask & value);
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ret = update_output_regs(dev, reg_out);
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k_sem_give(&drv_data->lock);
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return ret;
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}
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static int gpio_fxl6408_port_set_bits_raw(const struct device *dev,
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uint32_t mask)
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{
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return gpio_fxl6408_port_set_masked_raw(dev, mask, mask);
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}
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static int gpio_fxl6408_port_clear_bits_raw(const struct device *dev,
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uint32_t mask)
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{
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return gpio_fxl6408_port_set_masked_raw(dev, mask, 0);
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}
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static int gpio_fxl6408_port_toggle_bits(const struct device *dev,
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uint32_t mask)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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uint8_t reg_out;
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int ret;
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/* Can't do I2C bus operations from an ISR */
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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k_sem_take(&drv_data->lock, K_FOREVER);
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reg_out = drv_data->reg_cache.output;
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reg_out ^= mask;
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ret = update_output_regs(dev, reg_out);
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k_sem_give(&drv_data->lock);
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return ret;
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}
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static int gpio_fxl6408_pin_interrupt_configure(const struct device *port,
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gpio_pin_t pin,
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enum gpio_int_mode mode,
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enum gpio_int_trig trig)
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{
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LOG_DBG("Pin interrupts not supported.");
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return -ENOTSUP;
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}
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int gpio_fxl6408_init(const struct device *dev)
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{
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struct gpio_fxl6408_drv_data *const drv_data =
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(struct gpio_fxl6408_drv_data *const)dev->data;
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const struct gpio_fxl6408_config *const config = dev->config;
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if (!device_is_ready(config->i2c_master)) {
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LOG_ERR("%s is not ready", config->i2c_master->name);
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return -ENODEV;
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}
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k_sem_init(&drv_data->lock, 1, 1);
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return 0;
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}
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static const struct gpio_driver_api gpio_fxl_driver = {
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.pin_configure = gpio_fxl6408_pin_config,
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.port_get_raw = gpio_fxl6408_port_get_raw,
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.port_set_masked_raw = gpio_fxl6408_port_set_masked_raw,
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.port_set_bits_raw = gpio_fxl6408_port_set_bits_raw,
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.port_clear_bits_raw = gpio_fxl6408_port_clear_bits_raw,
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.port_toggle_bits = gpio_fxl6408_port_toggle_bits,
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.pin_interrupt_configure = gpio_fxl6408_pin_interrupt_configure
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};
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#define GPIO_FXL6408_DEVICE_INSTANCE(inst) \
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static const struct gpio_fxl6408_config gpio_fxl6408_##inst##_cfg = { \
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.common = { \
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.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(inst),\
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}, \
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.i2c_slave_addr = DT_INST_REG_ADDR(inst), \
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.i2c_master = DEVICE_DT_GET(DT_INST_BUS(inst)) \
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}; \
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\
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static struct gpio_fxl6408_drv_data gpio_fxl6408_##inst##_drvdata = { \
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.reg_cache = { \
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.input = 0x0, \
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.output = 0x00, \
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.dir = 0x0, \
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.high_z = 0xFF, \
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.pud_en = 0xFF, \
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.pud_sel = 0x0 \
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} \
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}; \
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\
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DEVICE_DT_INST_DEFINE(inst, gpio_fxl6408_init, NULL, \
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&gpio_fxl6408_##inst##_drvdata, \
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&gpio_fxl6408_##inst##_cfg, POST_KERNEL, \
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CONFIG_GPIO_FXL6408_INIT_PRIORITY, \
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&gpio_fxl_driver);
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DT_INST_FOREACH_STATUS_OKAY(GPIO_FXL6408_DEVICE_INSTANCE)
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