i2c.h

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/*
 * Copyright (c) 2014, 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_I2C_I2C_H
#define _DEV_I2C_I2C_H

#include <linux/i2c.h>
#include <linux/i2c-dev.h>

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

#include <sys/ioctl.h>
#include <sys/stat.h>

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

typedef struct i2c_msg i2c_msg;

typedef struct i2c_bus i2c_bus;

typedef struct i2c_dev i2c_dev;

typedef struct i2c_rdwr_ioctl_data i2c_rdwr_ioctl_data;

#define I2C_BUS_OBTAIN 0x800

#define I2C_BUS_RELEASE 0x801

#define I2C_BUS_GET_CONTROL 0x802

#define I2C_BUS_SET_CLOCK 0x803

#define I2C_BUS_CLOCK_DEFAULT 100000

struct i2c_bus {
  int (*transfer)(i2c_bus *bus, i2c_msg *msgs, uint32_t msg_count);

  int (*set_clock)(i2c_bus *bus, unsigned long clock);

  void (*destroy)(i2c_bus *bus);

  rtems_recursive_mutex mutex;

  uint16_t default_address;

  bool ten_bit_address;

  bool use_pec;

  unsigned long retries;

  rtems_interval timeout;

  unsigned long functionality;
};

int i2c_bus_init(i2c_bus *bus);

i2c_bus *i2c_bus_alloc_and_init(size_t size);

void i2c_bus_destroy(i2c_bus *bus);

void i2c_bus_destroy_and_free(i2c_bus *bus);

int i2c_bus_register(
  i2c_bus *bus,
  const char *bus_path
);

void i2c_bus_obtain(i2c_bus *bus);

void i2c_bus_release(i2c_bus *bus);

int i2c_bus_transfer(i2c_bus *bus, i2c_msg *msgs, uint32_t msg_count);

#define I2C_DEV_IO_CONTROL 0x900

struct i2c_dev {
  ssize_t (*read)(i2c_dev *dev, void *buf, size_t n, off_t offset);

  ssize_t (*write)(i2c_dev *dev, const void *buf, size_t n, off_t offset);

  int (*ioctl)(i2c_dev *dev, ioctl_command_t command, void *arg);

  off_t (*get_size)(i2c_dev *dev);

  blksize_t (*get_block_size)(i2c_dev *dev);

  void (*destroy)(i2c_dev *dev);

  i2c_bus *bus;

  uint16_t address;

  int bus_fd;
};


int i2c_dev_init(i2c_dev *dev, const char *bus_path, uint16_t address);

i2c_dev *i2c_dev_alloc_and_init(
  size_t size,
  const char *bus_path,
  uint16_t address
);

void i2c_dev_destroy(i2c_dev *dev);

void i2c_dev_destroy_and_free(i2c_dev *dev);

int i2c_dev_register(
  i2c_dev *dev,
  const char *dev_path
);
  /* end of i2c device driver */

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* _DEV_I2C_I2C_H */