mpm: Add i2c APIs for simple transfers

1 files changed, 95 insertions, 0 deletions

diff --git a/mpm/lib/i2c/i2cdev_iface.cpp b/mpm/lib/i2c/i2cdev_iface.cpp
new file mode 100644
index 000000000..43aeea5e2
--- /dev/null
+++ b/mpm/lib/i2c/i2cdev_iface.cpp
@@ -0,0 +1,95 @@
+//
+// Copyright 2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+
+#include <mpm/i2c/i2c_iface.hpp>
+#include <mpm/exception.hpp>
+
+#include "i2cdev.h"
+
+#include <fcntl.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+
+#include <boost/format.hpp>
+#include <iostream>
+
+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
+    ) : _addr(addr),
+        _ten_bit_addr(ten_bit_addr),
+        _timeout_ms(timeout_ms)
+    {
+        if (i2cdev_open(
+                &_fd,
+                device.c_str(),
+                timeout_ms) < 0)
+        {
+            throw mpm::runtime_error(str(
+                boost::format("Could not initialize i2cdev device %s")
+                % device));
+        }
+
+        if (_fd < 0)
+        {
+            throw mpm::runtime_error(str(
+                boost::format("Could not open i2cdev device %s")
+                % device));
+        }
+    }
+
+    ~i2cdev_iface_impl()
+    {
+        close(_fd);
+    }
+
+    int transfer(uint8_t *tx, size_t tx_len, uint8_t *rx, size_t rx_len)
+    {
+        int ret = i2cdev_transfer(_fd, _addr, _ten_bit_addr,
+                                  tx, tx_len, rx, rx_len);
+
+        if (ret) {
+            throw mpm::runtime_error(str(
+                    boost::format("I2C Transaction failed!")
+            ));
+        }
+
+        return ret;
+    }
+
+private:
+    int _fd;
+    const uint16_t _addr;
+    const bool _ten_bit_addr;
+    const unsigned int _timeout_ms;
+};
+
+/******************************************************************************
+ * 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
+    );
+}
+