sensor_port_i2c.c

/* Copyright Statement:
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <nuttx/i2c/i2c_master.h>
#include "sensor_port_i2c.h"
#include "utils.h"

#define MAX_WRITE_LENGTH  16

static int get_max_master_id(void)
{
  int i;

  for (i = 0; g_i2c[i]; i++);

  return i - 1;
}

static int _i2c_read(FAR struct sns_port *port, uint8_t reg, FAR void *buff, size_t size)
{
  FAR const struct sensor_i2c_info *i2c_info = &port->binfo->u.i2c_info;
  FAR struct i2c_master_s *drv_i2c = port->master;

  return i2c_writeread(drv_i2c, (FAR const struct i2c_config_s *)&(i2c_info->frequency), &reg, 1, buff, size);
}

static int _i2c_write(FAR struct sns_port *port, uint8_t reg, FAR void *buff, size_t size)
{
  FAR const struct sensor_i2c_info *i2c_info = &port->binfo->u.i2c_info;
  FAR struct i2c_master_s *drv_i2c = port->master;
  uint8_t data[MAX_WRITE_LENGTH + 1];

  if (size > MAX_WRITE_LENGTH) {
    snshuberr("too much write data\n");
    return -EINVAL;
  }

  data[0] = reg;
  memcpy(&data[1], buff, size);

  return i2c_write(drv_i2c, (FAR struct i2c_config_s *)&(i2c_info->frequency), data, size + 1);
}

static struct port_ops i2c_ops = {
  .read = _i2c_read,
  .write = _i2c_write,
};

int port_init_i2c(FAR const struct sensor_bus_info *info, FAR struct sns_port *port)
{
  FAR const struct sensor_i2c_info *i2c_info = &info->u.i2c_info;
  int max_id;

  max_id = get_max_master_id();
  if (max_id < 0 || max_id < i2c_info->master_id) {
    snshuberr("no i2c master found\n");
    return -ENODEV;
  }

  port->master = g_i2c[i2c_info->master_id];
  port->ops = &i2c_ops;
  port->binfo = info;

  return 0;
}