nuttx/drivers/ioexpander/pca9555.h

/********************************************************************************************
 * drivers/ioexpander/pca9555.h
 *
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Sebastien Lorquet <sebastien@lorquet.fr>
 *
 * References:
 *   "16-bit I2C-bus and SMBus I/O port with interrupt product datasheet",
 *   Rev. 08 - 22 October 2009, NXP
 *
 * 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 NuttX 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
 * COPYRIGHT OWNER 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 __DRIVERS_IOEXPANDER_PCA9555_H
#define __DRIVERS_IOEXPANDER_PCA9555_H

/********************************************************************************************
 * Included Files
 ********************************************************************************************/

#include <nuttx/config.h>

#include <semaphore.h>

#include <nuttx/wdog.h>
#include <nuttx/clock.h>
#include <nuttx/ioexpander/ioexpander.h>
#include <nuttx/ioexpander/pca9555.h>

#include <nuttx/i2c/i2c_master.h>
#include <nuttx/irq.h>

#if defined(CONFIG_IOEXPANDER) && defined(CONFIG_IOEXPANDER_PCA9555)

/********************************************************************************************
 * Pre-processor Definitions
 ********************************************************************************************/
/* Configuration ****************************************************************************/
/* Prerequisites:
 *   CONFIG_I2C
 *     I2C support is required
 *   CONFIG_IOEXPANDER
 *     Enables support for the PCA9555 I/O expander
 *
 * Other settings that effect the driver: CONFIG_DISABLE_POLL
 *
 * CONFIG_IOEXPANDER_PCA9555
 *   Enables support for the PCA9555 driver (Needs CONFIG_INPUT)
 * CONFIG_PCA9555_MULTIPLE
 *   Can be defined to support multiple PCA9555 devices on board.
 * CONFIG_PCA9555_INT_DISABLE
 *   Disable driver GPIO interrupt functionality (ignored if GPIO functionality is
 *   disabled).
 */

#undef CONFIG_PCA9555_REFCNT

/* Driver support ***************************************************************************/
/* This format is used to construct the /dev/input[n] device driver path.  It defined here
 * so that it will be used consistently in all places.
 */

/* PCA9555 Resources ************************************************************************/

#define PCA9555_GPIO_NPINS 16 /* All pins can be used as GPIOs */

#ifndef CONFIG_I2C
#error "CONFIG_I2C is required by PCA9555"
#endif

#define PCA9555_MAXDEVS             8

/* I2C frequency */

#define PCA9555_I2C_MAXFREQUENCY    400000       /* 400KHz */

/* PCA9555 Registers ************************************************************************/
/* Register Addresses */

#define PCA9555_REG_INPUT  0x00
#define PCA9555_REG_OUTPUT 0x02
#define PCA9555_REG_POLINV 0x04
#define PCA9555_REG_CONFIG 0x06

/********************************************************************************************
 * Public Types
 ********************************************************************************************/

/* This structure represents the state of the PCA9555 driver */

struct pca9555_dev_s
{
  struct ioexpander_dev_s      dev;     /* Nested structure to allow casting as public gpio
                                         * expander. */

#ifdef CONFIG_PCA9555_MULTIPLE
  FAR struct pca9555_dev_s    *flink;   /* Supports a singly linked list of drivers */
#endif

  FAR struct pca9555_config_s *config;  /* Board configuration data */
  FAR struct i2c_master_s     *i2c;     /* Saved I2C driver instance */
  sem_t                        exclsem; /* Mutual exclusion */
};

#endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_PCA9555 */
#endif /* __DRIVERS_IOEXPANDER_PCA9555_H */