text: /****************************************************************************
   * include/nuttx/input/max31855.h
   *
   *   Copyright (C) 2014-2015 Gregory Nutt. All rights reserved.
   *   Author: Alan Carvalho de Assis <acassis@gmail.com>
   *
   * 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 __INCLUDE_NUTTX_SENSORS_MAX31855_H
  #define __INCLUDE_NUTTX_SENSORS_MAX31855_H
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  #include <nuttx/irq.h>
  
  #if defined(CONFIG_SENSORS_MAX31855)
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Types
   ****************************************************************************/
  
  #define MAX31855_SPI_MAXFREQ 4000000
  
  struct spi_dev_s;
  
  /****************************************************************************
   * Public Function Prototypes
   ****************************************************************************/
  
  #ifdef __cplusplus
  #define EXTERN extern "C"
  extern "C"
  {
  #else
  #define EXTERN extern
  #endif
  
  /****************************************************************************
   * Name: max31855_register
   *
   * Description:
   *   This function will register the max31855 driver as /dev/tempN
   *   where N is the minor device number.
   *
   * Input Parameters:
   *   devpath - The full path to the driver to register.  E.g., "/dev/temp0"
   *   spi     - An instance of the SPI interface to use to communicate with
   *             MAX31855
   *   devid   - Minor device number.  E.g., 0, 1, 2, etc.
   *
   * Returned Value:
   *   Zero is returned on success.  Otherwise, a negated errno value is
   *   returned to indicate the nature of the failure.
   *
   ****************************************************************************/
  
  int max31855_register(FAR const char *devpath, FAR struct spi_dev_s *spi, uint16_t devid);
  
  #undef EXTERN
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* CONFIG_SENSORS_MAX31855 */
  #endif /* __INCLUDE_NUTTX_SENSORS_MAX31855_H */
  