host/lib/usrp/common/validate_subdev_spec.cpp


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//
// Copyright 2011 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//

#include <uhd/exception.hpp>
#include <uhd/utils/assert_has.hpp>
#include <uhdlib/usrp/common/validate_subdev_spec.hpp>
#include <boost/format.hpp>

using namespace uhd;
using namespace uhd::usrp;

namespace uhd { namespace usrp {

static std::ostream& operator<<(std::ostream& out, const subdev_spec_pair_t& pair)
{
    out << pair.db_name << ":" << pair.sd_name;
    return out;
}

}} // namespace uhd::usrp

void uhd::usrp::validate_subdev_spec(property_tree::sptr tree,
    const subdev_spec_t& spec,
    const std::string& type,
    const std::string& mb)
{
    const size_t num_dsps =
        tree->list(str(boost::format("/mboards/%s/%s_dsps") % mb % type)).size();

    // sanity checking on the length
    if (spec.size() == 0)
        throw uhd::value_error(
            str(boost::format("Empty %s subdevice specification is not supported.\n")
                % type));
    if (spec.size() > num_dsps)
        throw uhd::value_error(
            str(boost::format("The subdevice specification \"%s\" is too long.\n"
                              "The user specified %u channels, but there are only %u %s "
                              "dsps on mboard %s.\n")
                % spec.to_string() % spec.size() % num_dsps % type % mb));

    // make a list of all possible specs
    subdev_spec_t all_specs;
    for (const std::string& db :
        tree->list(str(boost::format("/mboards/%s/dboards") % mb))) {
        for (const std::string& sd :
            tree->list(str(
                boost::format("/mboards/%s/dboards/%s/%s_frontends") % mb % db % type))) {
            all_specs.push_back(subdev_spec_pair_t(db, sd));
        }
    }

    // validate that the spec is possible
    for (const subdev_spec_pair_t& pair : spec) {
        uhd::assert_has(all_specs,
            pair,
            str(boost::format("%s subdevice specification on mboard %s") % type % mb));
    }

    // enable selected frontends, disable others
    for (const subdev_spec_pair_t& pair : all_specs) {
        const bool enb = uhd::has(spec, pair);
        tree->access<bool>(
                str(boost::format("/mboards/%s/dboards/%s/%s_frontends/%s/enabled") % mb
                    % pair.db_name % type % pair.sd_name))
            .set(enb);
    }
}