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//
// Copyright 2018 Ettus Research, a National Instruments Company
// Copyright 2019 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include "i2cdev.h"
#include <fcntl.h>
#include <linux/i2c-dev.h>
#include <linux/i2c.h>
#include <mpm/exception.hpp>
#include <mpm/i2c/i2c_iface.hpp>
using namespace mpm::i2c;
/******************************************************************************
* Implementation
*****************************************************************************/
class i2cdev_iface_impl : public i2c_iface
{
public:
i2cdev_iface_impl(const std::string& device,
const uint16_t addr,
const bool ten_bit_addr,
const unsigned int timeout_ms,
const bool do_open = false)
: _device(device)
, _addr(addr)
, _ten_bit_addr(ten_bit_addr)
, _timeout_ms(timeout_ms)
{
if (do_open) {
_open();
} else {
_fd = -ENODEV;
}
}
~i2cdev_iface_impl()
{
if (_fd >= 0) {
close(_fd);
}
}
int transfer(uint8_t* tx, size_t tx_len, uint8_t* rx, size_t rx_len, bool do_close)
{
if (_fd < 0) {
_open();
}
int ret = i2cdev_transfer(_fd, _addr, _ten_bit_addr, tx, tx_len, rx, rx_len);
if (do_close) {
close(_fd);
_fd = -ENODEV;
}
if (ret) {
throw mpm::runtime_error("I2C Transaction failed!");
}
return ret;
}
std::vector<uint8_t> transfer(
std::vector<uint8_t>& tx, size_t num_rx_bytes, bool do_close)
{
uint8_t *tx_data = NULL, *rx_data = NULL;
size_t tx_len = 0, rx_len = 0;
std::vector<uint8_t> rx(num_rx_bytes);
if (!tx.empty()) {
tx_data = tx.data();
tx_len = tx.size();
}
if (num_rx_bytes) {
rx_data = rx.data();
rx_len = rx.size();
}
const int err = transfer(tx_data, tx_len, rx_data, num_rx_bytes, do_close);
if (err) {
throw mpm::runtime_error("I2C Transaction failed!");
}
return rx;
}
private:
const std::string _device;
int _fd;
const uint16_t _addr;
const bool _ten_bit_addr;
const unsigned int _timeout_ms;
void _open(void)
{
if (i2cdev_open(&_fd, _device.c_str(), _timeout_ms) < 0) {
throw mpm::runtime_error(
std::string("Could not initialize i2cdev device ") + _device);
}
if (_fd < 0) {
throw mpm::runtime_error(
std::string("Could not open i2cdev device ") + _device);
}
}
};
/******************************************************************************
* Factory
*****************************************************************************/
i2c_iface::sptr i2c_iface::make_i2cdev(const std::string& bus,
const uint16_t addr,
const bool ten_bit_addr,
const int timeout_ms)
{
return std::make_shared<i2cdev_iface_impl>(bus, addr, ten_bit_addr, timeout_ms);
}
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