staging: rtl8192e: Use standard api to calculate channel to frequency

Use ieee80211_channel_to_freq_khz() to calculate channel to frequency to
omit proprietary code.
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Message-ID: <c3a94a403d04ba810cffff8afa734a94a218a4e9.1686166624.git.philipp.g.hortmann@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtl8192e/rtl_wx.c

@@ -342,9 +342,11 @@ static int _rtl92e_wx_get_range(struct net_device *dev,
 
 	for (i = 0, val = 0; i < 14; i++) {
 		if ((priv->rtllib->active_channel_map)[i + 1]) {
+			s32 freq_khz;
+
 			range->freq[val].i = i + 1;
-			range->freq[val].m = rtllib_wlan_frequencies[i] *
-					     100000;
+			freq_khz = ieee80211_channel_to_freq_khz(i + 1, NL80211_BAND_2GHZ);
+			range->freq[val].m = freq_khz * 100;
 			range->freq[val].e = 1;
 			val++;
 		}

drivers/staging/rtl8192e/rtllib.h

@@ -2049,8 +2049,6 @@ void TsStartAddBaProcess(struct rtllib_device *ieee,
 void RemovePeerTS(struct rtllib_device *ieee, u8 *Addr);
 void RemoveAllTS(struct rtllib_device *ieee);
 
-extern const long rtllib_wlan_frequencies[];
-
 static inline const char *escape_essid(const char *essid, u8 essid_len)
 {
 	static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];

drivers/staging/rtl8192e/rtllib_softmac_wx.c

@@ -15,15 +15,6 @@
 
 #include "rtllib.h"
 #include "dot11d.h"
-/* FIXME: add A freqs */
-
-const long rtllib_wlan_frequencies[] = {
-	2412, 2417, 2422, 2427,
-	2432, 2437, 2442, 2447,
-	2452, 2457, 2462, 2467,
-	2472, 2484
-};
-EXPORT_SYMBOL(rtllib_wlan_frequencies);
 
 int rtllib_wx_set_freq(struct rtllib_device *ieee, struct iw_request_info *a,
 			     union iwreq_data *wrqu, char *b)
@@ -83,8 +74,8 @@ int rtllib_wx_get_freq(struct rtllib_device *ieee,
 
 	if (ieee->current_network.channel == 0)
 		return -1;
-	fwrq->m = rtllib_wlan_frequencies[ieee->current_network.channel - 1] *
-		  100000;
+	fwrq->m = ieee80211_channel_to_freq_khz(ieee->current_network.channel,
+						NL80211_BAND_2GHZ) * 100;
 	fwrq->e = 1;
 	return 0;
 }