[    0.842302] silead_ts 0-0040: supply vddio not found, using dummy regulator
[    0.849452] silead_ts 0-0040: supply avdd not found, using dummy regulator
[    0.927208] silead_ts 0-0040: Silead chip ID: 0xA0820000
[    1.073402] silead_ts 0-0040: Direct firmware load for silead/gsl1680.fw failed with error -2
[    1.081989] silead_ts 0-0040: Firmware request error -2
[    1.087462] silead_ts: probe of 0-0040 failed with error -2

ls -lh lib/firmware/silead/gsl1680.fw
-rw-r--r-- 1 root root 43K 17. Feb 13:29 lib/firmware/silead/gsl1680.fw