drivers/i2c/i2c_ll_stm32.h

/*
 * Copyright (c) 2016 BayLibre, SAS
 * Copyright (c) 2017 Linaro Ltd
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 */

#ifndef ZEPHYR_DRIVERS_I2C_I2C_LL_STM32_H_
#define ZEPHYR_DRIVERS_I2C_I2C_LL_STM32_H_

typedef void (*irq_config_func_t)(const struct device *port);

#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32_i2c_v2)
/**
 * @brief structure to convey optional i2c timings settings
 */
struct i2c_config_timing {
	/* i2c peripheral clock in Hz */
	uint32_t periph_clock;
	/* i2c bus speed in Hz */
	uint32_t i2c_speed;
	/* I2C_TIMINGR register value of i2c v2 peripheral */
	uint32_t timing_setting;
};
#endif

struct i2c_stm32_config {
#ifdef CONFIG_I2C_STM32_INTERRUPT
	irq_config_func_t irq_config_func;
#endif
	struct stm32_pclken pclken;
	I2C_TypeDef *i2c;
	uint32_t bitrate;
	const struct pinctrl_dev_config *pcfg;
#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32_i2c_v2)
	const struct i2c_config_timing *timings;
	size_t n_timings;
#endif
};

struct i2c_stm32_data {
#ifdef CONFIG_I2C_STM32_INTERRUPT
	struct k_sem device_sync_sem;
#endif
	struct k_sem bus_mutex;
	uint32_t dev_config;
#ifdef CONFIG_I2C_STM32_V1
	uint16_t slave_address;
#endif
	struct {
#ifdef CONFIG_I2C_STM32_V1
		unsigned int is_restart;
		unsigned int flags;
#endif
		unsigned int is_write;
		unsigned int is_arlo;
		unsigned int is_nack;
		unsigned int is_err;
		struct i2c_msg *msg;
		unsigned int len;
		uint8_t *buf;
	} current;
#ifdef CONFIG_I2C_SLAVE
	bool master_active;
	struct i2c_slave_config *slave_cfg;
	bool slave_attached;
#endif
};

int32_t stm32_i2c_msg_write(const struct device *dev, struct i2c_msg *msg,
			    uint8_t *flg,
			    uint16_t sadr);
int32_t stm32_i2c_msg_read(const struct device *dev, struct i2c_msg *msg,
			   uint8_t *flg,
			   uint16_t sadr);
int32_t stm32_i2c_configure_timing(const struct device *dev, uint32_t clk);
int i2c_stm32_runtime_configure(const struct device *dev, uint32_t config);

void stm32_i2c_event_isr(void *arg);
void stm32_i2c_error_isr(void *arg);
#ifdef CONFIG_I2C_STM32_COMBINED_INTERRUPT
void stm32_i2c_combined_isr(void *arg);
#endif

#ifdef CONFIG_I2C_SLAVE
int i2c_stm32_slave_register(const struct device *dev,
			     struct i2c_slave_config *config);
int i2c_stm32_slave_unregister(const struct device *dev,
			       struct i2c_slave_config *config);
#endif

#endif	/* ZEPHYR_DRIVERS_I2C_I2C_LL_STM32_H_ */