wifi: Add new API to notify wificond of CC have changed

When device doesn't support NL80211_CMD_REG_CHANGED, the wificond has no
way to know the CC(country code) have changed. Add a new API to allow
the wifi frameworks notify wificond daemon of country code have changed.

Bug: 211573255
Bug: 212554181
Bug: 207426796
Test: atest WifiNl80211ManagerTest
Test: Maunal Test with log check.
Change-Id: I1e2c980062e66e6dcf007c0e2a4f1e9b203536ac

core/api/system-current.txt

@@ -8819,6 +8819,7 @@ package android.net.wifi.nl80211 {
     method @Nullable public android.net.wifi.nl80211.DeviceWiphyCapabilities getDeviceWiphyCapabilities(@NonNull String);
     method @NonNull public java.util.List<android.net.wifi.nl80211.NativeScanResult> getScanResults(@NonNull String, int);
     method @Nullable public android.net.wifi.nl80211.WifiNl80211Manager.TxPacketCounters getTxPacketCounters(@NonNull String);
+    method public boolean notifyCountryCodeChanged();
     method @Nullable public static android.net.wifi.nl80211.WifiNl80211Manager.OemSecurityType parseOemSecurityTypeElement(int, int, @NonNull byte[]);
     method @Deprecated public boolean registerApCallback(@NonNull String, @NonNull java.util.concurrent.Executor, @NonNull android.net.wifi.nl80211.WifiNl80211Manager.SoftApCallback);
     method public boolean registerCountryCodeChangedListener(@NonNull java.util.concurrent.Executor, @NonNull android.net.wifi.nl80211.WifiNl80211Manager.CountryCodeChangedListener);

wifi/java/src/android/net/wifi/nl80211/WifiNl80211Manager.java

@@ -1261,6 +1261,26 @@ public void unregisterCountryCodeChangedListener(@NonNull CountryCodeChangedList
         mWificondEventHandler.unregisterCountryCodeChangedListener(listener);
     }
 
+    /**
+     * Notifies the wificond daemon that the WiFi framework has successfully updated the Country
+     * Code of the driver. The wificond daemon needs this notification if the device does not
+     * support the NL80211_CMD_REG_CHANGED (otherwise it will find out on its own). The wificond
+     * updates in internal state in response to this Country Code update.
+     *
+     * @return true on success, false otherwise.
+     */
+    public boolean notifyCountryCodeChanged() {
+        try {
+            if (mWificond != null) {
+                mWificond.notifyCountryCodeChanged();
+                return true;
+            }
+        } catch (RemoteException e1) {
+            Log.e(TAG, "Failed to notify country code changed due to remote exception");
+        }
+        return false;
+    }
+
     /**
      * Register the provided callback handler for SoftAp events. The interface must first be created
      * using {@link #setupInterfaceForSoftApMode(String)}. The callback registration is valid until

wifi/tests/src/android/net/wifi/nl80211/WifiNl80211ManagerTest.java

@@ -1137,6 +1137,26 @@ public void testGetDeviceWiphyCapabilities() throws Exception {
         assertEquals(capaExpected, capaActual);
     }
 
+    /**
+     * Tests notifyCountryCodeChanged
+     */
+    @Test
+    public void testNotifyCountryCodeChanged() throws Exception {
+        doNothing().when(mWificond).notifyCountryCodeChanged();
+        assertTrue(mWificondControl.notifyCountryCodeChanged());
+        verify(mWificond).notifyCountryCodeChanged();
+    }
+
+    /**
+     * Tests notifyCountryCodeChanged with RemoteException
+     */
+    @Test
+    public void testNotifyCountryCodeChangedRemoteException() throws Exception {
+        doThrow(new RemoteException()).when(mWificond).notifyCountryCodeChanged();
+        assertFalse(mWificondControl.notifyCountryCodeChanged());
+        verify(mWificond).notifyCountryCodeChanged();
+    }
+
     // Create a ArgumentMatcher which captures a SingleScanSettings parameter and checks if it
     // matches the provided frequency set and ssid set.
     private class ScanMatcher implements ArgumentMatcher<SingleScanSettings> {