/*
 * Copyright (c) 2020 Nuvoton Technology Corporation.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef _NUVOTON_NPCX_SOC_MIWU_H_
#define _NUVOTON_NPCX_SOC_MIWU_H_

#include <stdint.h>

#include <zephyr/device.h>
#include <zephyr/drivers/gpio.h>

#ifdef __cplusplus
extern "C" {
#endif

enum miwu_table {
	NPCX_MIWU_TABLE_0,
	NPCX_MIWU_TABLE_1,
	NPCX_MIWU_TABLE_2,
	NPCX_MIWU_TABLE_COUNT
};

enum miwu_group {
	NPCX_MIWU_GROUP_1,
	NPCX_MIWU_GROUP_2,
	NPCX_MIWU_GROUP_3,
	NPCX_MIWU_GROUP_4,
	NPCX_MIWU_GROUP_5,
	NPCX_MIWU_GROUP_6,
	NPCX_MIWU_GROUP_7,
	NPCX_MIWU_GROUP_8,
	NPCX_MIWU_GROUP_COUNT
};

#define NPCX_MIWU_TABLE_NONE NPCX_MIWU_TABLE_COUNT

/* Interrupt modes supported by npcx miwu modules */
enum miwu_int_mode {
	NPCX_MIWU_MODE_LEVEL,
	NPCX_MIWU_MODE_EDGE,
};

/* Interrupt trigger modes supported by npcx miwu modules */
enum miwu_int_trig {
	NPCX_MIWU_TRIG_LOW,  /** Edge failing or active low detection */
	NPCX_MIWU_TRIG_HIGH, /** Edge rising or active high detection */
	NPCX_MIWU_TRIG_BOTH, /** Both edge rising and failing detection */
};

/* NPCX miwu driver callback type */
enum {
	NPCX_MIWU_CALLBACK_GPIO,
	NPCX_MIWU_CALLBACK_DEV,
};

/**
 * @brief NPCX wake-up input source structure
 *
 * Used to indicate a Wake-Up Input source (WUI) belongs to which group and bit
 * of Multi-Input Wake-Up Unit (MIWU) modules.
 */
struct npcx_wui {
	uint8_t table:2; /** A source belongs to which MIWU table. */
	uint8_t group:3; /** A source belongs to which group of MIWU table. */
	uint8_t bit:3; /** A source belongs to which bit of MIWU group. */
};

/**
 * Define npcx miwu driver callback handler signature for wake-up input source
 * of generic hardware. Its parameters contain the device issued interrupt
 * and corresponding WUI source.
 */
typedef void (*miwu_dev_callback_handler_t)(const struct device *source,
							struct npcx_wui *wui);

/**
 * @brief MIWU/GPIO information structure
 *
 * It contains both GPIO and MIWU information which is stored in unused field
 * of struct gpio_port_pins_t since a interested mask of pins is only 8 bits.
 * Beware the size of such structure must equal struct gpio_port_pins_t.
 */
struct miwu_io_params {
	uint8_t pin_mask; /** A mask of pins the callback is interested in. */
	uint8_t gpio_port; /** GPIO device index */
	uint8_t cb_type; /** Callback type */
	struct npcx_wui wui; /** Wake-up input source of GPIO */
};

/**
 * @brief MIWU/generic device information structure
 *
 * It contains the information used for MIWU generic device event. Please notice
 * the offset of cb_type must be the same as cb_type in struct miwu_io_params.
 */
struct miwu_dev_params {
	uint8_t reserve1;
	uint8_t reserve2;
	uint8_t cb_type; /** Callback type */
	struct npcx_wui wui; /** Device instance register callback function */
	const struct device *source; /** Wake-up input source */
};

/**
 * @brief MIWU callback structure for a gpio or device input
 *
 * Used to register a generic gpio/device callback in the driver instance
 * callback list. Beware such structure should not be allocated on stack.
 *
 * Note: To help setting it, see npcx_miwu_init_dev_callback() and
 *       npcx_miwu_manage_callback() below
 */
struct miwu_callback {
	/** Node of single-linked list */
	sys_snode_t node;
	union {
		struct {
			/** Callback function being called when GPIO event occurred */
			gpio_callback_handler_t handler;
			struct miwu_io_params params;
		} io_cb;

		struct {
			/** Callback function being called when device event occurred */
			miwu_dev_callback_handler_t handler;
			struct miwu_dev_params params;
		} dev_cb;
	};
};

/**
 * @brief Enable interrupt of the wake-up input source
 *
 * @param A pointer on wake-up input source
 */
void npcx_miwu_irq_enable(const struct npcx_wui *wui);

/**
 * @brief Disable interrupt of the wake-up input source
 *
 * @param wui A pointer on wake-up input source
 */
void npcx_miwu_irq_disable(const struct npcx_wui *wui);

/**
 * @brief Connect io to the wake-up input source
 *
 * @param wui A pointer on wake-up input source
 */
void npcx_miwu_io_enable(const struct npcx_wui *wui);

/**
 * @brief Disconnect io to the wake-up input source
 *
 * @param wui A pointer on wake-up input source
 */
void npcx_miwu_io_disable(const struct npcx_wui *wui);

/**
 * @brief Get interrupt state of the wake-up input source
 *
 * @param wui A pointer on wake-up input source
 *
 * @retval 0 if interrupt is disabled, otherwise interrupt is enabled
 */
bool npcx_miwu_irq_get_state(const struct npcx_wui *wui);

/**
 * @brief Get & clear interrupt pending bit of the wake-up input source
 *
 * @param wui A pointer on wake-up input source
 *
 * @retval 1 if interrupt is pending
 */
bool npcx_miwu_irq_get_and_clear_pending(const struct npcx_wui *wui);

/**
 * @brief Configure interrupt type of the wake-up input source
 *
 * @param wui Pointer to wake-up input source for configuring
 * @param mode Interrupt mode supported by NPCX MIWU
 * @param trig Interrupt trigger mode supported by NPCX MIWU
 *
 * @retval 0 If successful
 * @retval -EINVAL Invalid parameters
 */
int npcx_miwu_interrupt_configure(const struct npcx_wui *wui,
		enum miwu_int_mode mode, enum miwu_int_trig trig);

/**
 * @brief Function to initialize a struct miwu_callback with gpio properly
 *
 * @param callback Pointer to io callback structure for initialization
 * @param io_wui Pointer to wake-up input IO source
 * @param port GPIO port issued a callback function
 */
void npcx_miwu_init_gpio_callback(struct miwu_callback *callback,
				const struct npcx_wui *io_wui, int port);

/**
 * @brief Function to initialize a struct miwu_callback with device properly
 *
 * @param callback Pointer to device callback structure for initialization
 * @param dev_wui Pointer to wake-up input device source
 * @param handler A function called when its device input event issued
 * @param source Pointer to device instance issued a callback function
 */
void npcx_miwu_init_dev_callback(struct miwu_callback *callback,
				const struct npcx_wui *dev_wui,
				miwu_dev_callback_handler_t handler,
				const struct device *source);

/**
 * @brief Function to insert or remove a miwu callback from a callback list
 *
 * @param callback Pointer to miwu callback structure
 * @param set A boolean indicating insertion or removal of the callback
 *
 * @retval 0 If successful.
 * @retval -EINVAL Invalid parameters
 */
int npcx_miwu_manage_callback(struct miwu_callback *cb, bool set);

#ifdef __cplusplus
}
#endif
#endif /* _NUVOTON_NPCX_SOC_MIWU_H_ */