[kernel-snaps-uc22/main][PATCH] trim-firmware: support multi-API versioned iwlwifi ucode

[Dimitri John Ledkov]

BugLink: https://bugs.launchpad.net/bugs/1998841

Add support for multi-API versioned iwlwifi ucode files. If a direct
file is missing, check if a lower API version is available for
use. Currently in jammy this results in three ucodes being picked up
of a lower version number:

 + /root/parts/kernel/src/trim-firmware /root/parts/kernel/install/lib
 Overriding iwlwifi-so-a0-gf-a0-66.ucode with iwlwifi-so-a0-gf-a0-64.ucode
 Overriding iwlwifi-so-a0-hr-b0-66.ucode with iwlwifi-so-a0-hr-b0-64.ucode
 Overriding iwlwifi-so-a0-jf-b0-66.ucode with iwlwifi-so-a0-jf-b0-64.ucode

Separately need investigation if v66 ucode should be SRUed into jammy.

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov at canonical.com>
---
 trim-firmware | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/trim-firmware b/trim-firmware
index 6d0b5829b6..c590aa2114 100755
--- a/trim-firmware
+++ b/trim-firmware
@@ -23,6 +23,25 @@ DESTDIR=${1}
 
 # Copy required firmware files to a new directory
 while IFS= read -r fw_file ; do
+
+	# Most iwlwifi firwmare files are versioned, and lower
+	# versions are often required, when max version is not shipped
+	# by linux-firmware package
+	case $fw_file in iwlwifi-*.ucode)
+		if ! [ -e "${DESTDIR}"/firmware/${fw_file} ]; then
+			max_api=$(echo $fw_file | sed -n 's/iwlwifi-.*-\([0-9]*\).ucode/\1/p')
+			for api in `seq $max_api -1 39`; do
+				api_fw_file=${fw_file/%$max_api.ucode/$api.ucode}
+				if [ -e "${DESTDIR}"/firmware/$api_fw_file ]; then
+					echo Overriding $fw_file with $api_fw_file
+					fw_file=$api_fw_file
+					break;
+				fi
+			done
+		fi
+		;;
+	esac
+
 	for src_file in "${DESTDIR}"/firmware/${fw_file} ; do
 		if ! [ -e "${src_file}" ] ; then
 			continue  # Skip non-existing source files
-- 
2.34.1