ucentral-event: add channel switch handler

Add channel switch handler to update hapd object
with new frequency and channel info.

Fixes: WIFI-14336

Signed-off-by: Marek Kwaczynski <marek@shasta.cloud>

feeds/ucentral/ucentral-event/files/ucentral-event

@@ -119,6 +119,40 @@ function event(object, verb, payload) {
 		});
 }
 
+function freq2chan(freq) {
+	if (freq == 2484)
+		return 14;
+	else if (freq < 2484)
+		return (freq - 2407) / 5;
+	else if (freq >= 4910 && freq <= 4980)
+		return (freq - 4000) / 5;
+	else if(freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6)
+		return (freq - 56160) / 2160;
+	else if (freq == 5935)
+		return (freq - 5925) / 5;
+	else if (freq > 5950 && freq <= 7115)
+		return (freq - 5950) / 5;
+	else if (freq >= 5000 && freq < 5900)
+		return (freq - 5000) / 5;
+	else
+		return -1;
+}
+
+/* notify data expected format:
+ * { "ifname": "wlan1", "freq": 5180, "bssid": "XX:XX:XX:XX:XX:XX"
+ */
+function handle_channel_switch(hapd, notify) {
+	if (!notify && !notify?.data && !notify.data?.freq)
+		return;
+
+	let ch = freq2chan(notify.data.freq);
+	if (ch < 0)
+		return;
+
+	hapd.freq = notify.data.freq;
+	hapd.channel = ch;
+}
+
 let handlers;
 handlers = {
 	'sta-authorized': function(notify, hapd) {
@@ -177,6 +211,10 @@ handlers = {
 		}
 	},
 
+	'channel-switch' : function(notify, hapd) {
+		handle_channel_switch(hapd, notify);
+	},
+
 	disassoc: function(notify, hapd) {
 		if (ratelimit) {
 			let msg = {