module openconfig-wifi-phy {

  yang-version "1";

  // namespace
  namespace "http://openconfig.net/yang/wifi/phy";

  // Assign this module a prefix to be used by other modules, when imported.
  prefix "oc-wifi-phy";

  // Imports
  import openconfig-yang-types { prefix oc-yang; }
  // OC-specific types
  import openconfig-extensions { prefix oc-ext; }
  import openconfig-types { prefix oc-types; }
  import openconfig-wifi-types { prefix oc-wifi-types; }

  // Some required meta
  organization "OpenConfig working group";

  contact
    "OpenConfig working group
    www.openconfig.net";

  description
    "Model for managing PHY layer configuration of Radio interfaces.";

  oc-ext:openconfig-version "0.2.0";

  revision "2017-12-21" {
    description
      "Add last-seen to neighbor-table.";
    reference "0.2.0";
  }

  revision "2017-11-06" {
    description
      "Add SSID to neighbor-table.";
    reference "0.1.1";
  }

  revision "2017-07-25" {
    description
      "Initial revision.";
    reference "0.1.0";
  }

  // Grouping statements
  grouping radio-common-config {
    description
      "Configuration items common to all Radio interfaces, independent
      of frequency";

    leaf id {
      type uint8;
      description
        "Unique ID of the radio.";
    }

    leaf operating-frequency {
      type identityref {
        base oc-wifi-types:OPERATING_FREQUENCY;
      }
      description
        "Operating frequency of this radio.";
    }

    leaf enabled {
      type boolean;
      default "true";
      description
        "The desired operational state (up/down) of this radio interface.";
    }

    leaf transmit-power {
      type uint8;
      units dBm;
      default 9;
      description
        "Transmit power of the radio, in dBm.";
    }

    leaf channel {
      type uint8 {
        range "1..165";
        }
      description
        "Operating channel of this radio. If using channel-bonding this
        will represent the Primary 20MHz channel of the 40,80,160MHz channel.";
    }

    leaf channel-width {
      type uint8;
      units MHz;
      default 20;
      description
        "Operating channel-width of this radio.";
    }

    leaf dca {
      type boolean;
      default "true";
      description
        "Utilize Dynamic Channel Assignment on this Radio.";
    }

    leaf-list allowed-channels {
      type oc-wifi-types:channels-type;
      description
        "Allowed channel list for this Radio to utilize.";
    }

    leaf dtp {
      type boolean;
      default "true";
      description
        "Utilize dynamic transmit-power on this Radio.";
    }

    leaf dtp-min {
      when "../dtp = 'true'";
      type uint8;
      default '3';
      description
        "Minimum allowed transmit-power on this radio, if utilizing dtp.
        Expressed in dBm.";
    }

    leaf dtp-max {
      when "../dtp = 'true'";
      type uint8;
      default '15';
      description
        "Maximum allowed transmit-power on this radio, if utilizing dtp.
        Expressed in dBm.";
    }

    leaf antenna-gain {
      type int8;
      description
        "Antenna gain applied to this Radio; typically used when
        external antennae connected.";
    }

    leaf scanning {
      type boolean;
      default "true";
      description
        "Whether the radio will perform off-channel scanning, to collect
        neighboring RF information.";
    }

    leaf scanning-interval {
      type uint8;
      units seconds;
      description
        "How often, in seconds, the radio will go off-channel to perform
        scanning.";
    }

    leaf scanning-dwell-time {
      type uint16;
      units milliseconds;
      description
        "Amount of time, in milliseconds, the radio will spend on a
        channel during scanning-interval. If a Monitor-mode Radio, it will
        cycle through scanning-allowed-channels spending this amount of time
        on each.";
    }

    leaf scanning-defer-clients {
      type uint8;
      description
        "Do not perform scanning if this amount of Stations are Associated
        to the Radio.";
    }

    leaf scanning-defer-traffic {
      type boolean;
      description
        "Do not perform scanning if any traffic received from an active Station
        in the past 100ms marked as AC_VO or AC_VI.";
    }
  }

  grouping radio-common-state {
    description
      "Grouping for defining radio-specific operational state";

    leaf base-radio-mac {
      type oc-yang:mac-address;
      description
        "Represents the 'burned-in' base-radio MAC
        address for the a Radio interface.";
    }

    leaf dfs-hit-time {
      type oc-types:timeticks64;
      description
        "Reports the time of the last DFS hit. The value is the timestamp
        in seconds relative to the Unix Epoch (Jan 1, 1970 00:00:00 UTC).";
    }

    leaf channel-change-reason {
      type identityref {
        base oc-wifi-types:CHANGE_REASON_TYPE;
      }
      description
        "When an Access Point changes channels, this will
        provide the reason that led to the change.";
    }

    leaf total-channel-utilization {
      type oc-types:percentage;
      description
        "Total 802.11 and non-802.11 channel utilization on this Radio. The
        total channel utilization should include all time periods the AP
        spent actively receiving and transmitting 802.11 frames, and also
        include all time spent with clear channel assessment (CCA) in a
        busy state";
    }

    leaf rx-dot11-channel-utilization {
      type oc-types:percentage;
      description
        "Received channel-utilization due to 802.11 frames";
    }

    leaf rx-noise-channel-utilization {
      type oc-types:percentage;
         description
           "Received channel-utilization percentage due to Noise.";
    }

    leaf tx-dot11-channel-utilization {
      type oc-types:percentage;
      description
        "Transmit channel-utilization percentage.";
    }
  }

  grouping radio-counters-state {
    description
      "Radio telemetry statistics.";
    container counters {
      description
        "A collection of radio-related statistics objects.";

      // Rx Counters
      leaf failed-fcs-frames {
        type oc-yang:counter64;
        description
          "Number of frames that failed the FCS";
      }

      // Tx Counters
      leaf noise-floor {
        type int8;
        description
          "Noise Floor, as measured by this radio.";
      }
    }
  }

  // neighbor BSSID | SSID | RSSI | Channel | Center Channel | Last-seen
  grouping neighbor-list-state {
    description
      "Operational state data relating to neighboring
       BSSIDs and their received signal strength.";
    leaf bssid {
      type oc-yang:mac-address;
      description
        "Neighboring BSSID.";
    }

    leaf ssid {
      type string;
      description
       "The SSID of this neighboring BSSID.";
    }

    leaf rssi {
      type int8;
      description
       "The RSSI of this neighboring BSSID.";
    }

    leaf channel {
      type uint16;
      description
        "The channel of this neighboring BSSID. This is to utilize 802.11ac
        nomenclature. For example, 40MHz channel 36-40 represented as
        channel 38. primary-channel used to identify the primary
        20MHz channel of the neighbor.";
    }

    leaf primary-channel {
      type uint16;
      description
        "The primary 20MHz channel, if the neighbor is operating on bonded
        channel.";
    }

    leaf last-seen {
      type oc-types:timeticks64;
      description
        "Reports the time this reading was taken, indicating when this neighbor
        was last seen. If a cache is used, it MUST be updated instantly when a
        neighbor BSS changes channels, or a new BSS is seen. The value is the
        timestamp in seconds relative to the Unix Epoch
        (Jan 1, 1970 00:00:00 UTC).";
    }
  }

  grouping neighbor-bssid-top {
  description
    "Top-level grouping for neighbor table
    operational state data.";

    container neighbors {
      description
        "Top-level container for RF neighbors.";
      list neighbor {
        key "bssid";
        config false;
        description
          "The mac address, or BSSID, of a neighbor, and
          their corresponding RSSI.";

        leaf bssid {
          type leafref {
            path "../state/bssid";
          }
          config false;
          description "Reference to neighbor bssid.";
        }

        container state {
          config false;
          description
            "State container for RF neighbors.";
          uses neighbor-list-state;
        }
      }
    }
  }

  grouping radio-top {
    description
      "Top-level grouping for radio configuration and
      operational state data";

    container radios {
      description
        "Top level container for radios, including configuration
        and state data.";

      list radio {
        key "id";
        description
          "The list of radios on the device.";

        leaf id {
          type leafref {
            path "../config/id";
          }
          description
            "References the configured id of the radio";
        }

        container config {
          description
            "Configurable items at the global, radio interface
            level";

          uses radio-common-config;
        }

        container state {
          config false;
          description
            "Operational state data at the global radio level";

          uses radio-common-config;
          uses radio-common-state;
          uses radio-counters-state;
        }
        uses neighbor-bssid-top;
      }
    }
  }
  uses radio-top;
}