spidev.h

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/*
 * Copyright (c) 2016 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 _UAPI_LINUX_SPI_H
#define _UAPI_LINUX_SPI_H

#include <sys/ioccom.h>
#include <stddef.h>
#include <stdint.h>

#define SPI_CPHA 0x01

#define SPI_CPOL 0x02

#define SPI_MODE_0 0

#define SPI_MODE_1 SPI_CPHA

#define SPI_MODE_2 SPI_CPOL

#define SPI_MODE_3 (SPI_CPOL | SPI_CPHA)

#define SPI_CS_HIGH 0x04

#define SPI_LSB_FIRST 0x08

#define SPI_3WIRE 0x10

#define SPI_LOOP 0x20

#define SPI_NO_CS 0x40

#define SPI_READY 0x80

#define SPI_TX_DUAL 0x100

#define SPI_TX_QUAD 0x200

#define SPI_RX_DUAL 0x400

#define SPI_RX_QUAD 0x800

#define SPI_IOC_MAGIC 's'

struct spi_ioc_transfer {
  void *rx_buf;

  const void *tx_buf;

  size_t len;

  uint32_t speed_hz;

  uint16_t delay_usecs;

  uint8_t bits_per_word;

  uint8_t cs_change;

  uint8_t rx_nbits;

  uint8_t tx_nbits;

  uint32_t mode;

  uint8_t cs;
};

#define SPI_MSGSIZE(n) \
  (((n) * sizeof(struct spi_ioc_transfer) < IOCPARM_MAX) ? \
    (n) * sizeof(struct spi_ioc_transfer) : 0)

#define SPI_IOC_MESSAGE(n) _IOW(SPI_IOC_MAGIC, 0, char[SPI_MSGSIZE(n)])

#define SPI_IOC_RD_MODE _IOR(SPI_IOC_MAGIC, 1, uint8_t)

#define SPI_IOC_WR_MODE _IOW(SPI_IOC_MAGIC, 1, uint8_t)

#define SPI_IOC_RD_LSB_FIRST _IOR(SPI_IOC_MAGIC, 2, uint8_t)

#define SPI_IOC_WR_LSB_FIRST _IOW(SPI_IOC_MAGIC, 2, uint8_t)

#define SPI_IOC_RD_BITS_PER_WORD _IOR(SPI_IOC_MAGIC, 3, uint8_t)

#define SPI_IOC_WR_BITS_PER_WORD _IOW(SPI_IOC_MAGIC, 3, uint8_t)

#define SPI_IOC_RD_MAX_SPEED_HZ _IOR(SPI_IOC_MAGIC, 4, uint32_t)

#define SPI_IOC_WR_MAX_SPEED_HZ _IOW(SPI_IOC_MAGIC, 4, uint32_t)

#define SPI_IOC_RD_MODE32 _IOR(SPI_IOC_MAGIC, 5, uint32_t)

#define SPI_IOC_WR_MODE32 _IOW(SPI_IOC_MAGIC, 5, uint32_t)

#endif /* _UAPI_LINUX_SPI_H */