wifi: Allow configuration of country code for wifi

Wifi country code handling is a nightmare - Most retail devices
have region customization in /system for each country a device
is shipped to.

This doesn't work very well for a firmware like Cyanogenmod,
where we try to support all target countries with one firmware
package.  For whatever reason, with newer Broadcom drivers/
firmware blobs, the old trick of using a universal region code
(ccode=ALL in nvram_net.txt) does not seem to work.  Who knows
what the deal is for other wifi chipsets.

The good thing is that wpa_supplicant has a standardized
cross-chipset method for setting the region code, and we
use that here.

Change-Id: Ia9f5133f61f56d89ccb290e37a393f5de507e1cf

1 files changed, 22 insertions, 0 deletions

diff --git a/src/com/android/settings/wifi/AdvancedWifiSettings.java b/src/com/android/settings/wifi/AdvancedWifiSettings.java
index 809496a..99b2f10 100644
--- a/src/com/android/settings/wifi/AdvancedWifiSettings.java
+++ b/src/com/android/settings/wifi/AdvancedWifiSettings.java
@@ -42,6 +42,7 @@ public class AdvancedWifiSettings extends SettingsPreferenceFragment
     private static final String KEY_MAC_ADDRESS = "mac_address";
     private static final String KEY_CURRENT_IP_ADDRESS = "current_ip_address";
     private static final String KEY_FREQUENCY_BAND = "frequency_band";
+    private static final String KEY_COUNTRY_CODE = "wifi_countrycode";
     private static final String KEY_NOTIFY_OPEN_NETWORKS = "notify_open_networks";
     private static final String KEY_SLEEP_POLICY = "sleep_policy";
     private static final String KEY_POOR_NETWORK_DETECTION = "wifi_poor_network_detection";
@@ -110,6 +111,17 @@ public class AdvancedWifiSettings extends SettingsPreferenceFragment
             }
         }
 
+        ListPreference ccodePref = (ListPreference) findPreference(KEY_COUNTRY_CODE);
+        if (ccodePref != null) {
+            ccodePref.setOnPreferenceChangeListener(this);
+            String value = mWifiManager.getCountryCode();
+            if (value != null) {
+                ccodePref.setValue(value);
+            } else {
+                Log.e(TAG, "Failed to fetch country code");
+            }
+        }
+
         ListPreference sleepPolicyPref = (ListPreference) findPreference(KEY_SLEEP_POLICY);
         if (sleepPolicyPref != null) {
             if (Utils.isWifiOnly(getActivity())) {
@@ -181,6 +193,16 @@ public class AdvancedWifiSettings extends SettingsPreferenceFragment
             }
         }
 
+        if (KEY_COUNTRY_CODE.equals(key)) {
+            try {
+                mWifiManager.setCountryCode((String) newValue, true);
+            } catch (IllegalArgumentException e) {
+                Toast.makeText(getActivity(), R.string.wifi_setting_countrycode_error,
+                        Toast.LENGTH_SHORT).show();
+                return false;
+            }
+        }
+
         if (KEY_SLEEP_POLICY.equals(key)) {
             try {
                 String stringValue = (String) newValue;