SPI: Implement SPI engine for x410

Add SPI Core host implementation for x410 and a discoverable
feature to make it accessible.

2 files changed, 61 insertions, 0 deletions

diff --git a/host/include/uhd/features/discoverable_feature.hpp b/host/include/uhd/features/discoverable_feature.hpp
index e56c3f6e3..be01a36c7 100644
--- a/host/include/uhd/features/discoverable_feature.hpp
+++ b/host/include/uhd/features/discoverable_feature.hpp
@@ -36,6 +36,7 @@ public:
         REF_CLK_CALIBRATION,
         TRIG_IO_MODE,
         GPIO_POWER,
+        SPI_GETTER_IFACE
     };
 
     virtual ~discoverable_feature() = default;
diff --git a/host/include/uhd/features/spi_getter_iface.hpp b/host/include/uhd/features/spi_getter_iface.hpp
new file mode 100755
index 000000000..1909de095
--- /dev/null
+++ b/host/include/uhd/features/spi_getter_iface.hpp
@@ -0,0 +1,60 @@
+//
+// Copyright 2021 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#pragma once
+
+#include <uhd/features/discoverable_feature.hpp>
+#include <uhd/types/serial.hpp>
+#include <memory>
+
+namespace uhd { namespace features {
+
+/*!
+ * The SPI slave configuration struct:
+ * Used to configure the GPIO lines for SPI transactions
+ */
+struct spi_slave_config_t
+{
+    //! Indicates which GPIO line to use for this the CS signal.
+    uint8_t slave_ss;
+
+    //! Indicates which GPIO line to use for this the MISO signal.
+    uint8_t slave_miso;
+
+    //! Indicates which GPIO line to use for this the MOSI signal.
+    uint8_t slave_mosi;
+
+    //! Indicates which GPIO line to use for this the SCLK signal.
+    uint8_t slave_clk;
+};
+
+/*! Interface to provide access to SPI Interface.
+ */
+class spi_getter_iface : public discoverable_feature
+{
+public:
+    using sptr = std::shared_ptr<spi_getter_iface>;
+
+    static discoverable_feature::feature_id_t get_feature_id()
+    {
+        return discoverable_feature::SPI_GETTER_IFACE;
+    }
+
+    std::string get_feature_name() const
+    {
+        return "SPI Getter Interface";
+    }
+
+    virtual ~spi_getter_iface() = default;
+
+    /*! Return the SPI interface to read and write on.
+     * \return SPI interface
+     */
+    virtual uhd::spi_iface::sptr get_spi_ref(
+        const std::vector<uhd::features::spi_slave_config_t>& spi_slave_config) const = 0;
+};
+
+}} // namespace uhd::features