mac80211: add support for multiple wiphys behind a single device

The device path will be the same for the first phy. For all subsequent
phys, the path gets an extra +1, +2, ...
Move the code for converting path to phy and vice versa to a separate
library script shared by config detection code and the netifd wireless
handler script

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mac80211/files/lib/wifi/mac80211.sh

@@ -1,4 +1,6 @@
 #!/bin/sh
+. /lib/netifd/mac80211.sh
+
 append DRIVERS "mac80211"
 
 lookup_phy() {
@@ -9,11 +11,8 @@ lookup_phy() {
 	local devpath
 	config_get devpath "$device" path
 	[ -n "$devpath" ] && {
-		for phy in $(ls /sys/class/ieee80211 2>/dev/null); do
-			case "$(readlink -f /sys/class/ieee80211/$phy/device)" in
-				*$devpath) return;;
-			esac
-		done
+		phy="$(mac80211_path_to_phy "$devpath")"
+		[ -n "$phy" ] && return
 	}
 
 	local macaddr="$(config_get "$device" macaddr | tr 'A-Z' 'a-z')"
@@ -91,16 +90,8 @@ detect_mac80211() {
 
 		[ -n "$htmode" ] && ht_capab="set wireless.radio${devidx}.htmode=$htmode"
 
-		if [ -x /usr/bin/readlink -a -h /sys/class/ieee80211/${dev} ]; then
-			path="$(readlink -f /sys/class/ieee80211/${dev}/device)"
-		else
-			path=""
-		fi
+		path="$(mac80211_phy_to_path "$dev")"
 		if [ -n "$path" ]; then
-			path="${path##/sys/devices/}"
-			case "$path" in
-				platform*/pci*) path="${path##platform/}";;
-			esac
 			dev_id="set wireless.radio${devidx}.path='$path'"
 		else
 			dev_id="set wireless.radio${devidx}.macaddr=$(cat /sys/class/ieee80211/${dev}/macaddress)"