ath9k: move RELAY and DEBUG_FS to ATH9K[_HTC]_DEBUGFS

Currently, the common ath9k_common module needs to have a
dependency on RELAY and DEBUG_FS in order to built. This
is usually not a problem. But for RAM and FLASH starved
AR71XX devices, every little bit counts.

This patch adds a new symbol CONFIG_ATH9K_COMMON_DEBUG
which makes it possible to drop the RELAY and DEBUG_FS
dependency there and move it to ATH_(HTC)_DEBUGFS.

Note: The shared FFT/spectral code (which is the only user
of the relayfs in ath9k*) needs DEBUG_FS to export the relayfs
interface to dump the data to userspace. So it makes no sense
to have the functions compiled in, if DEBUG_FS is not there.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath9k/common-spectral.h

@@ -151,6 +151,7 @@ static inline u8 spectral_bitmap_weight(u8 *bins)
 	return bins[0] & 0x3f;
 }
 
+#ifdef CONFIG_ATH9K_COMMON_DEBUG
 void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv, struct dentry *debugfs_phy);
 void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv);
 
@@ -161,5 +162,27 @@ int ath9k_cmn_spectral_scan_config(struct ath_common *common,
 			       enum spectral_mode spectral_mode);
 int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_hdr *hdr,
 		    struct ath_rx_status *rs, u64 tsf);
+#else
+static inline void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv,
+						 struct dentry *debugfs_phy)
+{
+}
+
+static inline void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv)
+{
+}
+
+static inline void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
+						   struct ath_spec_scan_priv *spec_priv)
+{
+}
+
+static inline int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv,
+				      struct ieee80211_hdr *hdr,
+				      struct ath_rx_status *rs, u64 tsf)
+{
+	return 0;
+}
+#endif /* CONFIG_ATH9K_COMMON_DEBUG */
 
 #endif /* SPECTRAL_H */