drivers/gpio/gpio_pcal9535a.h

/*
 * 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.
 */

/**
 * @file Header file for the PCAL9535A driver.
 */

#ifndef _GPIO_PCAL9535A_H_
#define _GPIO_PCAL9535A_H_

#include <nanokernel.h>

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

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Initialization function for PCAL9535A
 *
 * @param dev Device struct
 * @return 0 if successful, failed otherwise
 */
extern int gpio_pcal9535a_init(struct device *dev);

/** Configuration data */
struct gpio_pcal9535a_config {
	/** The master I2C device's name */
	const char * const i2c_master_dev_name;

	/** The slave address of the chip */
	uint16_t i2c_slave_addr;

	uint8_t stride[2];
};

/** Store the port 0/1 data for each register pair. */
union gpio_pcal9535a_port_data {
	uint16_t all;
	uint8_t port[2];
	uint8_t byte[2];
};

/** Runtime driver data */
struct gpio_pcal9535a_drv_data {
	/** Master I2C device */
	struct device *i2c_master;

	/**
	 * Specify polarity inversion of pin. This is used for ouput as
	 * the polarity inversion registers on chip affects inputs only.
	 */
	uint32_t out_pol_inv;

	/** Use for delay between operations */
	struct nano_timer timer;

	struct {
		union gpio_pcal9535a_port_data output;
		union gpio_pcal9535a_port_data pol_inv;
		union gpio_pcal9535a_port_data dir;
		union gpio_pcal9535a_port_data pud_en;
		union gpio_pcal9535a_port_data pud_sel;
	} reg_cache;

	uint8_t stride[2];
};

#ifdef __cplusplus
}
#endif

#endif /* _GPIO_PCAL9535A_H_ */