[openwrt/openwrt] qualcommax: ipq807x: add WLAN device path migration

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/4989556a53e788ea81aa2623446b16e0f44f60e3

commit 4989556a53e788ea81aa2623446b16e0f44f60e3
Author: Robert Marko <robimarko at gmail.com>
AuthorDate: Sat Mar 9 11:22:05 2024 +0100

    qualcommax: ipq807x: add WLAN device path migration
    
    Kernel 6.6 has changed the path of WLAN devices as the soc node was updated
    to include an adress as well because according to spec it needed one:
    https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/arch/arm64/boot/dts/qcom/ipq8074.dtsi?h=v6.6.21&id=da6aa1111a17db11367817ddc10c5a6c188cdc44
    
    So, this will break existing configuration as device path was changed for
    example:
    "platform/soc/c000000.wifi" to "platform/soc at 0/c000000.wifi"
    "platform/soc/c000000.wifi+1" to "platform/soc at 0/c000000.wifi+1"
    
    PCIe attached devices also have their path changed, so lets add a script
    that will migrate the paths based on the detected running kernel version
    so returning to kernel 6.1 will work as well.
    
    Co-developed-by: Sean Khan <datapronix at protonmail.com>
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 .../etc/hotplug.d/ieee80211/05-wifi-migrate        | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/target/linux/qualcommax/ipq807x/base-files/etc/hotplug.d/ieee80211/05-wifi-migrate b/target/linux/qualcommax/ipq807x/base-files/etc/hotplug.d/ieee80211/05-wifi-migrate
new file mode 100644
index 0000000000..aa0069410a
--- /dev/null
+++ b/target/linux/qualcommax/ipq807x/base-files/etc/hotplug.d/ieee80211/05-wifi-migrate
@@ -0,0 +1,68 @@
+#!/bin/sh
+
+# This must run before 10-wifi-detect
+
+[ "${ACTION}" = "add" ] || return
+
+. /lib/functions.sh
+
+check_kernel()
+{
+	local kernel_current=$(uname -r)
+	if [ ${kernel_current//./} -lt "6600" ]; then
+	  return 1
+	fi
+}
+
+do_migrate_radio()
+{
+	local cfg="$1" from="$2" to="$3"
+
+	config_get path "$cfg" path
+
+	[ "$path" = "$from" ] || return
+
+	uci set "wireless.${cfg}.path=${to}"
+	WIRELESS_CHANGED=true
+
+	logger -t wifi-migrate "Updated path of wireless.${cfg} from '${from}' to '${to}'"
+}
+
+check_path()
+{
+	local config
+	config="$1"
+
+	config_get path "$config" path
+
+	to=${path/soc\//soc at 0\/}
+
+	# Checks if kernel version is less than 6.6.0, if it is and the path is using the new format,
+	# then path should be migrated to the old format. This would allow users on platforms with two partitions,
+	# to test 6.1 and 6.6.
+	check_kernel || to=${path/soc at 0\//soc\/}
+
+	[ "$path" = "$to" ] || do_migrate_radio "$config" "$path" "$to"
+}
+
+migrate_radio()
+{
+	config_load wireless
+
+	# Check if there is already a section with the target path: In this case, the system
+	# was already upgraded to a version without this migration script before; better bail out,
+	# as we can't be sure we don't break more than we fix.
+	config_foreach check_path wifi-device
+}
+
+WIRELESS_CHANGED=false
+
+case "$(board_name)" in
+*)
+	migrate_radio
+    ;;
+esac
+
+$WIRELESS_CHANGED && uci commit wireless
+
+exit 0