/*
 * Copyright (c) 2020 Geanix ApS, Pete Johanson
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @file Header file for the MCP23017 driver.
 */

#ifndef ZEPHYR_DRIVERS_GPIO_GPIO_MCP23017_H_
#define ZEPHYR_DRIVERS_GPIO_GPIO_MCP23017_H_

#include <kernel.h>

#include <drivers/gpio.h>
#include <drivers/i2c.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Register definitions */
#define REG_IODIR_PORTA 0x00
#define REG_IODIR_PORTB 0x01
#define REG_IPOL_PORTA 0x02
#define REG_IPOL_PORTB 0x03
#define REG_GPINTEN_PORTA 0x04
#define REG_GPINTEN_PORTB 0x05
#define REG_DEFVAL_PORTA 0x06
#define REG_DEFVAL_PORTB 0x07
#define REG_INTCON_PORTA 0x08
#define REG_INTCON_PORTB 0x09
#define REG_GPPU_PORTA 0x0C
#define REG_GPPU_PORTB 0x0D
#define REG_INTF_PORTA 0x0E
#define REG_INTF_PORTB 0x0F
#define REG_INTCAP_PORTA 0x10
#define REG_INTCAP_PORTB 0x11
#define REG_GPIO_PORTA 0x12
#define REG_GPIO_PORTB 0x13
#define REG_OLAT_PORTA 0x14
#define REG_OLAT_PORTB 0x15

#define MCP23017_ADDR 0x40
#define MCP23017_READBIT 0x01

/** Configuration data */
struct mcp23017_config {
    /* gpio_driver_data needs to be first */
    struct gpio_driver_config common;

    const char *const i2c_dev_name;
    const uint16_t slave;
};

/** Runtime driver data */
struct mcp23017_drv_data {
    /* gpio_driver_data needs to be first */
    struct gpio_driver_config data;

    /** Master SPI device */
    const struct device *i2c;

    struct k_sem lock;

    struct {
        uint16_t iodir;
        uint16_t ipol;
        uint16_t gpinten;
        uint16_t defval;
        uint16_t intcon;
        uint16_t iocon;
        uint16_t gppu;
        uint16_t intf;
        uint16_t intcap;
        uint16_t gpio;
        uint16_t olat;
    } reg_cache;
};

#ifdef __cplusplus
}
#endif

#endif /* ZEPHYR_DRIVERS_GPIO_GPIO_MCP23017_H_ */