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>

1 files changed, 36 insertions, 0 deletions

diff --git a/package/kernel/mac80211/files/lib/netifd/mac80211.sh b/package/kernel/mac80211/files/lib/netifd/mac80211.sh
new file mode 100644
index 0000000000..92e5c0e395
--- /dev/null
+++ b/package/kernel/mac80211/files/lib/netifd/mac80211.sh
@@ -0,0 +1,36 @@
+mac80211_phy_to_path() {
+	local phy="$1"
+
+	[ -x /usr/bin/readlink -a -h /sys/class/ieee80211/${phy} ] || return
+
+	local path="$(readlink -f /sys/class/ieee80211/${phy}/device)"
+	[ -n "$path" ] || return
+
+	path="${path##/sys/devices/}"
+	case "$path" in
+		platform*/pci*) path="${path##platform/}";;
+	esac
+
+	local p
+	local seq=""
+	for p in $(ls /sys/class/ieee80211/$phy/device/ieee80211); do
+		[ "$p" = "$phy" ] && {
+			echo "$path${seq:++$seq}"
+			break
+		}
+
+		seq=$((${seq:-0} + 1))
+	done
+}
+
+mac80211_path_to_phy() {
+	local path="$1"
+
+	local p
+	for p in $(ls /sys/class/ieee80211); do
+		local cur="$(mac80211_phy_to_path "$p")"
+		case "$cur" in
+			*$path) echo "$p"; return;;
+		esac
+	done
+}