mac80211: support wildcard paths when matching phys

This change introduces support for wildcard patterns in "option path"
of section "wifi-device".

Objective is to allow paths like "*/usb[0-9]/*/*" in order to claim
any usb device using the same backend type, regardless of its bus
address or phy name.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

Backport of r41873

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@41965 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh

@@ -364,9 +364,13 @@ mac80211_generate_mac() {
 
 find_phy() {
 	[ -n "$phy" -a -d /sys/class/ieee80211/$phy ] && return 0
-	[ -n "$path" -a -d "/sys/devices/$path/ieee80211" ] && {
-		phy="$(ls /sys/devices/$path/ieee80211 | grep -m 1 phy)"
-		[ -n "$phy" ] && return 0
+	[ -n "$path" ] && {
+		for phy in /sys/devices/$path/ieee80211/phy*; do
+			[ -e "$phy" ] && {
+				phy="${phy##*/}"
+				return 0
+			}
+		done
 	}
 	[ -n "$macaddr" ] && {
 		for phy in $(ls /sys/class/ieee80211 2>/dev/null); do

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

@@ -8,9 +8,13 @@ lookup_phy() {
 
 	local devpath
 	config_get devpath "$device" path
-	[ -n "$devpath" -a -d "/sys/devices/$devpath/ieee80211" ] && {
-		phy="$(ls /sys/devices/$devpath/ieee80211 | grep -m 1 phy)"
-		[ -n "$phy" ] && return
+	[ -n "$devpath" ] && {
+		for _phy in /sys/devices/$devpath/ieee80211/phy*; do
+			[ -e "$_phy" ] && {
+				phy="${_phy##*/}"
+				return
+			}
+		done
 	}
 
 	local macaddr="$(config_get "$device" macaddr | tr 'A-Z' 'a-z')"