i2c.h

Go to the documentation of this file.

 
/*
 * 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 */