/*
 * Copyright (c) 2017, Intel Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of the Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE INTEL CORPORATION OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __QM_GPIO_H__
#define __QM_GPIO_H__

#include "qm_common.h"
#include "qm_soc_regs.h"

/**
 * General Purpose IO.
 *
 * @defgroup groupGPIO GPIO
 * @{
 */

/**
 * GPIO pin states.
 */
typedef enum {
	QM_GPIO_LOW = 0,  /**< GPIO low state. */
	QM_GPIO_HIGH,     /**< GPIO high state. */
	QM_GPIO_STATE_NUM /**< Number of GPIO states. */
} qm_gpio_state_t;

/**
 * GPIO port configuration type.
 *
 * Each bit in the registers control a GPIO pin.
 */
typedef struct {
	uint32_t direction;    /**< GPIO direction, 0b: input, 1b: output. */
	uint32_t int_en;       /**< Interrupt enable. */
	uint32_t int_type;     /**< Interrupt type, 0b: level; 1b: edge. */
	uint32_t int_polarity; /**< Interrupt polarity, 0b: low, 1b: high. */
	uint32_t int_debounce; /**< Interrupt debounce on/off. */
	uint32_t int_bothedge; /**< Interrupt on rising and falling edges. */

	/**
	 * Transfer callback.
	 *
	 * @param[in] data Callback user data.
	 * @param[in] int_status GPIO interrupt status.
	 */
	void (*callback)(void *data, uint32_t int_status);
	void *callback_data; /**< Callback user data. */
} qm_gpio_port_config_t;

/**
 * Set GPIO port configuration.
 *
 * This includes if interrupts are enabled or not, the level on which an
 * interrupt is generated, the polarity of interrupts and if GPIO-debounce is
 * enabled or not. If interrupts are enabled it also registers the user defined
 * callback function.
 *
 * @param[in] gpio GPIO port index to configure.
 * @param[in] cfg New configuration for GPIO port. This must not be NULL.
 *
 * @return Standard errno return type for QMSI.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 *
 */
int qm_gpio_set_config(const qm_gpio_t gpio,
		       const qm_gpio_port_config_t *const cfg);

/**
 * Read the current state of a single pin on a given GPIO port.
 *
 * @param[in] gpio GPIO port index.
 * @param[in] pin Pin of GPIO port to read.
 * @param[out] state Current state of the pin. This must not be NULL.
 *
 * @return Standard errno return type for QMSI.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 */
int qm_gpio_read_pin(const qm_gpio_t gpio, const uint8_t pin,
		     qm_gpio_state_t *const state);

/**
 * Set a single pin on a given GPIO port.
 *
 * @param[in] gpio GPIO port index.
 * @param[in] pin Pin of GPIO port to set.
 *
 * @return Standard errno return type for QMSI.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 */
int qm_gpio_set_pin(const qm_gpio_t gpio, const uint8_t pin);

/**
 * Clear a single pin on a given GPIO port.
 *
 * @param[in] gpio GPIO port index.
 * @param[in] pin Pin of GPIO port to clear.
 *
 * @return int 0 on success, error code otherwise.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 */
int qm_gpio_clear_pin(const qm_gpio_t gpio, const uint8_t pin);

/**
 * Set or clear a single GPIO pin using a state variable.
 *
 * @param[in] gpio GPIO port index.
 * @param[in] pin Pin of GPIO port to update.
 * @param[in] state QM_GPIO_LOW for low or QM_GPIO_HIGH for high.
 *
 * @return Standard errno return type for QMSI.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 */
int qm_gpio_set_pin_state(const qm_gpio_t gpio, const uint8_t pin,
			  const qm_gpio_state_t state);

/**
 * Read the value of every pin on a GPIO port.
 *
 * Each bit of the val parameter is set to the current value of each pin on the
 * port. Maximum 32 pins per port.
 *
 * @param[in] gpio GPIO port index.
 * @param[out] port State of every pin in a GPIO port. This must not be NULL.
 *
 * @return Standard errno return type for QMSI.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 */
int qm_gpio_read_port(const qm_gpio_t gpio, uint32_t *const port);

/**
 * Write a value to every pin on a GPIO port.
 *
 * Each pin on the GPIO port is set to the corresponding value set in the val
 * parameter. Maximum 32 pins per port.
 *
 * @param[in] gpio GPIO port index.
 * @param[in] val Value of all pins on GPIO port.
 *
 * @return Standard errno return type for QMSI.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 */
int qm_gpio_write_port(const qm_gpio_t gpio, const uint32_t val);

/**
 * Save GPIO context.
 *
 * Save the configuration of the specified GPIO peripheral
 * before entering sleep.
 *
 * @param[in] gpio GPIO port index.
 * @param[out] ctx GPIO context structure. This must not be NULL.
 *
 * @return Standard errno return type for QMSI.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 */
int qm_gpio_save_context(const qm_gpio_t gpio, qm_gpio_context_t *const ctx);

/**
 * Restore GPIO context.
 *
 * Restore the configuration of the specified GPIO peripheral
 * after exiting sleep.
 *
 * @param[in] gpio GPIO port index.
 * @param[in] ctx GPIO context structure. This must not be NULL.
 *
 * @return Standard errno return type for QMSI.
 * @retval 0 on success.
 * @retval Negative @ref errno for possible error codes.
 */
int qm_gpio_restore_context(const qm_gpio_t gpio,
			    const qm_gpio_context_t *const ctx);
/**
 * @}
 */

#endif /* __QM_GPIO_H__ */