spi.h

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/*
 * Copyright (c) 2016, 2017 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Dornierstr. 4
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

#ifndef _DEV_SPI_SPI_H
#define _DEV_SPI_SPI_H

#include <linux/spi/spidev.h>

#include <rtems.h>
#include <rtems/seterr.h>
#include <rtems/thread.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

typedef struct spi_ioc_transfer spi_ioc_transfer;

typedef struct spi_bus spi_bus;

#define SPI_BUS_OBTAIN _IO(SPI_IOC_MAGIC, 13)

#define SPI_BUS_RELEASE _IO(SPI_IOC_MAGIC, 23)

struct spi_bus {
  int (*transfer)(spi_bus *bus, const spi_ioc_transfer *msgs, uint32_t msg_count);

  int (*setup)(spi_bus *bus);

  void (*destroy)(spi_bus *bus);

  rtems_recursive_mutex mutex;

  uint32_t max_speed_hz;

  uint32_t speed_hz;

  bool cs_change;

  uint8_t cs;

  uint8_t bits_per_word;

  bool lsb_first;

  uint32_t mode;

  uint16_t delay_usecs;
};

int spi_bus_init(spi_bus *bus);

spi_bus *spi_bus_alloc_and_init(size_t size);

void spi_bus_destroy(spi_bus *bus);

void spi_bus_destroy_and_free(spi_bus *bus);

int spi_bus_register(
  spi_bus *bus,
  const char *bus_path
);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* _DEV_SPI_SPI_H */