/* gpio.h - public GPIO driver APIs */

/*
 * Copyright (c) 2015 Intel Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __GPIO_H__
#define __GPIO_H__

#ifdef __cplusplus
extern "C" {
#endif

#define GPIO_ACCESS_BY_PIN 0
#define GPIO_ACCESS_BY_PORT 1

#include <stdint.h>
#include <stddef.h>
#include <device.h>

/* TODO Define flag/config bits */
#define GPIO_DIR_IN		(0 << 0)
#define GPIO_DIR_OUT		(1 << 0)
#define GPIO_DIR_MASK		0x1

#define GPIO_INT		(1 << 1)

#define GPIO_INT_ACTIVE_LOW	(0 << 2)
#define GPIO_INT_ACTIVE_HIGH	(1 << 2)
#define GPIO_INT_CLOCK_SYNC     (1 << 3)
#define GPIO_INT_DEBOUNCE       (1 << 4)
#define GPIO_INT_LEVEL		(0 << 5)
#define GPIO_INT_EDGE		(1 << 5)
#define GPIO_INT_DOUBLE_EDGE	(1 << 6)

/* Polarity of the GPIO (1 bit) */
#define GPIO_POL_POS		7
#define GPIO_POL_NORMAL		(0 << GPIO_POL_POS)
#define GPIO_POL_INV		(1 << GPIO_POL_POS)
#define GPIO_POL_MASK		(1 << GPIO_POL_POS)

/* Pull-up/pull-down for GPIO (2 bits) */
#define GPIO_PUD_POS		8
#define GPIO_PUD_NORMAL		(0 << GPIO_PUD_POS)
#define GPIO_PUD_PULL_UP	(1 << GPIO_PUD_POS)
#define GPIO_PUD_PULL_DOWN	(2 << GPIO_PUD_POS)
#define GPIO_PUD_MASK		(3 << GPIO_PUD_POS)

/* application callback function signature*/
typedef void (*gpio_callback_t)(struct device *port, uint32_t pin);

/* driver API definition */
typedef int (*gpio_config_t)(struct device *port, int access_op,
			     uint32_t pin, int flags);
typedef int (*gpio_write_t)(struct device *port, int access_op,
			    uint32_t pin, uint32_t value);
typedef int (*gpio_read_t)(struct device *port, int access_op,
			   uint32_t pin, uint32_t *value);
typedef int (*gpio_set_callback_t)(struct device *port,
				   gpio_callback_t callback);
typedef int (*gpio_enable_callback_t)(struct device *port,
				      int access_op,
				      uint32_t pin);
typedef int (*gpio_disable_callback_t)(struct device *port,
				       int access_op,
				       uint32_t pin);
typedef int (*gpio_suspend_port_t)(struct device *port);
typedef int (*gpio_resume_port_t)(struct device *port);

struct gpio_driver_api {
	gpio_config_t config;
	gpio_write_t write;
	gpio_read_t read;
	gpio_set_callback_t set_callback;
	gpio_enable_callback_t enable_callback;
	gpio_disable_callback_t disable_callback;
	gpio_suspend_port_t suspend;
	gpio_resume_port_t resume;
};

/**
 *  @brief Configure a single pin
 *  @param port Pointer to device structure for driver instance.
 *  @param pin Pin number operate on.
 *  @param flags Flags for pin configuration. IN/OUT, interrupt ...
 */
static inline int gpio_pin_configure(struct device *port, uint8_t pin,
				     int flags)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->config(port, GPIO_ACCESS_BY_PIN, pin, flags);
}

/**
 *  @brief Write data value of a single pin.
 *  @param port Pointer to device structure for driver instance.
 *  @param pin Pin number operate on.
 *  @param value Value to set the pin to.
 */
static inline int gpio_pin_write(struct device *port, uint32_t pin,
				 uint32_t value)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->write(port, GPIO_ACCESS_BY_PIN, pin, value);

}

/**
 *  @brief Read data value of a single pin.
 *  @param port Pointer to device structure for driver instance.
 *  @param pin Pin number operate on.
 *  @param value Integer pointer to receive the output of the read.
 */
static inline int gpio_pin_read(struct device *port, uint32_t pin,
				uint32_t *value)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->read(port, GPIO_ACCESS_BY_PIN, pin, value);

}

/**
 *  @brief Set the application callback..
 *  @param port Pointer to device structure for driver instance.
 *  @param callback Application callback function.
 */
static inline int gpio_set_callback(struct device *port,
				    gpio_callback_t callback)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->set_callback(port, callback);
}

/**
 *  @brief Enable pin callback.
 *  @param port Pointer to device structure for driver instance.
 *  @param pin Pin number operate on.
 */
static inline int gpio_pin_enable_callback(struct device *port, uint32_t pin)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->enable_callback(port, GPIO_ACCESS_BY_PIN, pin);

}

/**
 *  @brief Disable pin callback.
 *  @param port Pointer to device structure for driver instance.
 *  @param pin Pin number operate on.
 */
static inline int gpio_pin_disable_callback(struct device *port, uint32_t pin)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->disable_callback(port, GPIO_ACCESS_BY_PIN, pin);
}


/**
 *  @brief Configure all pins in the port.
 *  @param port Pointer to device structure for driver instance.
 *  @param flags Flags for port configuration. IN/OUT, interrupt ...
 */
static inline int gpio_port_configure(struct device *port, int flags)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->config(port, GPIO_ACCESS_BY_PORT, 0, flags);
}

/**
 *  @brief Write data value to the port.
 *  @param port Pointer to device structure for driver instance.
 *  @param value Value to set the pin to.
 */
static inline int gpio_port_write(struct device *port, uint32_t value)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->write(port, GPIO_ACCESS_BY_PORT, 0, value);

}

/**
 *  @brief Read data value of the port.
 *  @param port Pointer to device structure for driver instance.
 *  @param value Integer pointer to receive the output of the read.
 */
static inline int gpio_port_read(struct device *port, uint32_t *value)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->read(port, GPIO_ACCESS_BY_PORT, 0, value);

}

/**
 *  @brief Enable port callback.
 *  @param port Pointer to device structure for driver instance.
 */
static inline int gpio_port_enable_callback(struct device *port)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->enable_callback(port, GPIO_ACCESS_BY_PORT, 0);

}

/**
 *  @brief Disable port callback.
 *  @param port Pointer to device structure for driver instance.
 */
static inline int gpio_port_disable_callback(struct device *port)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->disable_callback(port, GPIO_ACCESS_BY_PORT, 0);
}

/**
 *  @brief Save the state of the device and go to low power state
 *  @param port Pointer to device structure for driver instance.
 */
static inline int gpio_suspend(struct device *port)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->suspend(port);
}

/**
 *  @brief Restore state stored during suspend and resume operation.
 *  @param port Pointer to device structure for driver instance.
 */
static inline int gpio_resume(struct device *port)
{
	struct gpio_driver_api *api;

	api = (struct gpio_driver_api *) port->driver_api;
	return api->resume(port);
}

#ifdef __cplusplus
}
#endif

#endif /* __GPIO_H__ */