#!/bin/sh

# Some devices (xiaomi-surya) ship with a touchscreen that has no persistent
# firmware storage. That is unfortunate and means we need to provide firmware
# from the initramfs for FDE to work.
# This is only the case for the novatek touchscreens. Their firmware resides
# in /vendor/firmware. Let's copy it over.
# The file names are novatek_ts_huaxing_fw.bin and novatek_ts_tianma_fw.bin,
# for both panels respectively.

if lsmod | grep -wq "nt36xxx"
then
	echo "nt36xxx is loaded, mounting firmware for it!"

	mkdir /firmware-mnt

	for part in /sys/block/sd*/sd*
	do
		DEVNAME="$(grep DEVNAME "$part"/uevent | sed 's/DEVNAME=//g')"
		PARTNAME="$(grep PARTNAME "$part"/uevent | sed 's/PARTNAME=//g')"

		# Could be vendor_a or vendor_b
		if [[ "$PARTNAME" == "vendor"* ]]
		then
			mount -o ro,nodev,noexec,nosuid \
				"/dev/$DEVNAME" /firmware-mnt

			for firmware_file in /firmware-mnt/firmware/novatek_ts_*_fw.bin
			do
				echo "Found novatek firmware file at $firmware_file"

				cp $firmware_file /lib/firmware/
			done

			umount /firmware-mnt
		fi
	done
fi