[posix-app] get radio caps from NCP (#3021)

src/ncp/ncp_base_dispatcher.cpp

@@ -617,6 +617,9 @@ NcpBase::PropertyHandler NcpBase::FindGetPropertyHandler(spinel_prop_key_t aKey)
         // Raw Link API Properties (Get Handler)
 
 #if OPENTHREAD_RADIO || OPENTHREAD_ENABLE_RAW_LINK_API
+    case SPINEL_PROP_RADIO_CAPS:
+        handler = &NcpBase::HandlePropertyGet<SPINEL_PROP_RADIO_CAPS>;
+        break;
     case SPINEL_PROP_MAC_SRC_MATCH_ENABLED:
         handler = &NcpBase::HandlePropertyGet<SPINEL_PROP_MAC_SRC_MATCH_ENABLED>;
         break;

src/ncp/ncp_base_radio.cpp

@@ -177,6 +177,11 @@ exit:
     return;
 }
 
+template <> otError NcpBase::HandlePropertyGet<SPINEL_PROP_RADIO_CAPS>(void)
+{
+    return mEncoder.WriteUintPacked(otLinkRawGetCaps(mInstance));
+}
+
 template <> otError NcpBase::HandlePropertyGet<SPINEL_PROP_MAC_SRC_MATCH_ENABLED>(void)
 {
     // TODO: Would be good to add an `otLinkRaw` API to give the the status of source match.

src/ncp/spinel.h

@@ -845,6 +845,16 @@ typedef enum {
      */
     SPINEL_PROP_CHANNEL_MONITOR_CHANNEL_OCCUPANCY = SPINEL_PROP_PHY_EXT__BEGIN + 10,
 
+    /// Radio caps
+    /** Format: `i` (read-only)
+     *
+     * Data per item is:
+     *
+     *  `i`: Radio Capabilities.
+     *
+     */
+    SPINEL_PROP_RADIO_CAPS = SPINEL_PROP_PHY_EXT__BEGIN + 11,
+
     SPINEL_PROP_PHY_EXT__END = 0x1300,
 
     SPINEL_PROP_MAC__BEGIN             = 0x30,

src/posix/platform/radio_spinel.cpp

@@ -395,6 +395,12 @@ void RadioSpinel::Init(const char *aRadioFile, const char *aRadioConfig)
     VerifyOrExit(mIsReady, error = OT_ERROR_FAILED);
     SuccessOrExit(error = Get(SPINEL_PROP_HWADDR, SPINEL_DATATYPE_UINT64_S, &NODE_ID));
 
+    {
+        unsigned int caps;
+        SuccessOrExit(error = Get(SPINEL_PROP_RADIO_CAPS, SPINEL_DATATYPE_UINT_PACKED_S, &caps));
+        mRadioCaps = static_cast<otRadioCaps>(caps);
+    }
+
     mRxRadioFrame.mPsdu = mRxPsdu;
     mTxRadioFrame.mPsdu = mTxPsdu;
 
@@ -1518,8 +1524,7 @@ int8_t otPlatRadioGetRssi(otInstance *aInstance)
 otRadioCaps otPlatRadioGetCaps(otInstance *aInstance)
 {
     OT_UNUSED_VARIABLE(aInstance);
-    return static_cast<otRadioCaps>(OT_RADIO_CAPS_ACK_TIMEOUT | OT_RADIO_CAPS_TRANSMIT_RETRIES |
-                                    OT_RADIO_CAPS_CSMA_BACKOFF);
+    return sRadioSpinel.GetRadioCaps();
 }
 
 bool otPlatRadioGetPromiscuous(otInstance *aInstance)

src/posix/platform/radio_spinel.hpp

@@ -160,6 +160,14 @@ public:
      */
     otError SetTransmitPower(int8_t aPower);
 
+    /**
+     * This method returns the radio capabilities.
+     *
+     * @returns The radio capability bit vector.
+     *
+     */
+    otRadioCaps GetRadioCaps(void) const { return mRadioCaps; }
+
     /**
      * This method returns the radio receive sensitivity value.
      *
@@ -513,6 +521,7 @@ private:
     otExtAddress mExtendedAddress;
     uint16_t     mShortAddress;
     uint16_t     mPanid;
+    otRadioCaps  mRadioCaps;
     uint8_t      mChannel;
     int8_t       mRxSensitivity;
     uint8_t      mTxState;