qcacld-3.0: Register dummy APIs to NAN ops

Kernel needs the below to create NAN interface from driver,
1. Register APIs to the NAN ops. Define dummy APIs as the APIs
   are not supported for the current driver design.
2. Define NAN supported bands and 2GHZ is mandatory.
3. Set the iftype NL80211_IFTYPE_NAN in the supported
   interface_modes.

Change-Id: I22db31840da2ba0e44b79077a8790b55f1151684
CRs-Fixed: 2592022

core/hdd/src/wlan_hdd_cfg80211.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012-2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2020 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -15091,6 +15091,28 @@ wlan_hdd_iftype_data_mem_free(struct hdd_context *hdd_ctx)
 }
 #endif
 
+#if defined(WLAN_FEATURE_NAN) && \
+	   (KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE)
+static void wlan_hdd_set_nan_if_mode(struct wiphy *wiphy)
+{
+	wiphy->interface_modes |= BIT(NL80211_IFTYPE_NAN);
+}
+
+static void wlan_hdd_set_nan_supported_bands(struct wiphy *wiphy)
+{
+	wiphy->nan_supported_bands =
+		BIT(NL80211_BAND_2GHZ) | BIT(NL80211_BAND_5GHZ);
+}
+#else
+static void wlan_hdd_set_nan_if_mode(struct wiphy *wiphy)
+{
+}
+
+static void wlan_hdd_set_nan_supported_bands(struct wiphy *wiphy)
+{
+}
+#endif
+
 /*
  * FUNCTION: wlan_hdd_cfg80211_init
  * This function is called by hdd_wlan_startup()
@@ -15154,6 +15176,7 @@ int wlan_hdd_cfg80211_init(struct device *dev,
 				 | BIT(NL80211_IFTYPE_AP)
 				 | BIT(NL80211_IFTYPE_MONITOR);
 
+	wlan_hdd_set_nan_if_mode(wiphy);
 
 	/*
 	 * In case of static linked driver at the time of driver unload,
@@ -15233,6 +15256,8 @@ int wlan_hdd_cfg80211_init(struct device *dev,
 	wiphy->max_num_csa_counters = WLAN_HDD_MAX_NUM_CSA_COUNTERS;
 	wlan_hdd_cfg80211_action_frame_randomization_init(wiphy);
 
+	wlan_hdd_set_nan_supported_bands(wiphy);
+
 	hdd_exit();
 	return 0;
 
@@ -23664,6 +23689,42 @@ wlan_hdd_cfg80211_external_auth(struct wiphy *wiphy,
 }
 #endif
 
+#if defined(WLAN_FEATURE_NAN) && \
+	   (KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE)
+static int
+wlan_hdd_cfg80211_start_nan(struct wiphy *wiphy, struct wireless_dev *wdev,
+			    struct cfg80211_nan_conf *conf)
+{
+	return -EOPNOTSUPP;
+}
+
+static void
+wlan_hdd_cfg80211_stop_nan(struct wiphy *wiphy, struct wireless_dev *wdev)
+{
+}
+
+static int wlan_hdd_cfg80211_add_nan_func(struct wiphy *wiphy,
+					  struct wireless_dev *wdev,
+					  struct cfg80211_nan_func *nan_func)
+{
+	return -EOPNOTSUPP;
+}
+
+static void wlan_hdd_cfg80211_del_nan_func(struct wiphy *wiphy,
+					   struct wireless_dev *wdev,
+					   u64 cookie)
+{
+}
+
+static int wlan_hdd_cfg80211_nan_change_conf(struct wiphy *wiphy,
+					     struct wireless_dev *wdev,
+					     struct cfg80211_nan_conf *conf,
+					     u32 changes)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
 /**
  * wlan_hdd_chan_info_cb() - channel info callback
  * @chan_info: struct scan_chan_info
@@ -23992,4 +24053,13 @@ static struct cfg80211_ops wlan_hdd_cfg80211_ops = {
 		defined(CFG80211_EXTERNAL_AUTH_SUPPORT)
 	.external_auth = wlan_hdd_cfg80211_external_auth,
 #endif
+#if defined(WLAN_FEATURE_NAN) && \
+	   (KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE)
+	.start_nan = wlan_hdd_cfg80211_start_nan,
+	.stop_nan = wlan_hdd_cfg80211_stop_nan,
+	.add_nan_func = wlan_hdd_cfg80211_add_nan_func,
+	.del_nan_func = wlan_hdd_cfg80211_del_nan_func,
+	.nan_change_conf = wlan_hdd_cfg80211_nan_change_conf,
+#endif
+
 };