[beluga] USB only working in ADB mode

[beroset]

It appears that on beluga only ADB mode is working.

Running systemctl status usb-moded.service gives this result:

x usb-moded.service - usb-moded USB gadget controller
     Loaded: loaded (/lib/systemd/system/usb-moded.service; disabled; preset: disabled)
     Active: failed (Result: exit-code) since Fri 2024-05-31 14:33:25 EDT; 50min ago
    Process: 989 ExecStartPre=/usr/bin/init_ffs (code=exited, status=1/FAILURE)

May 31 14:33:25 beluga systemd[1]: usb-moded.service: Control process exi...LURE
May 31 14:33:25 beluga systemd[1]: usb-moded.service: Failed with result ...de'.
May 31 14:33:25 beluga systemd[1]: Failed to start usb-moded USB gadget c...ler.
May 31 14:33:25 beluga systemd[1]: usb-moded.service: Scheduled restart j...t 5.
May 31 14:33:25 beluga systemd[1]: Stopped usb-moded USB gadget controller.
May 31 14:33:25 beluga systemd[1]: usb-moded.service: Start request repea...kly.
May 31 14:33:25 beluga systemd[1]: usb-moded.service: Failed with result ...de'.
May 31 14:33:25 beluga systemd[1]: Failed to start usb-moded USB gadget c...ler.
Hint: Some lines were ellipsized, use -l to show in full.

Manually running /usr/bin/init_ffs gives this:

/usr/bin/init_ffs: line 3: can't create /sys/class/android_usb/android0/enable: Permission denied
/usr/bin/init_ffs: line 9: can't create /sys/class/android_usb/android0/iSerial: Permission denied
/usr/bin/init_ffs: line 10: can't create /sys/class/android_usb/android0/iManufacturer: Permission denied
/usr/bin/init_ffs: line 11: can't create /sys/class/android_usb/android0/iProduct: Permission denied
/usr/bin/init_ffs: line 13: can't create /sys/class/android_usb/android0/enable: Permission denied

That file is here:

#!/bin/sh

echo "0" > /sys/class/android_usb/android0/enable

manufacturer="$(cat /system/build.prop | grep -o 'ro.product.manufacturer=.*' | cut -d'=' -f 2)"
model="$(cat /system/build.prop | grep -o 'ro.product.model=.*' | cut -d'=' -f 2)"
serial="$(cat /proc/cmdline | sed 's/.*androidboot.serialno=//' | sed 's/ .*//')"

echo $serial       > /sys/class/android_usb/android0/iSerial
echo $manufacturer > /sys/class/android_usb/android0/iManufacturer
echo $model        > /sys/class/android_usb/android0/iProduct

echo "1" >  /sys/class/android_usb/android0/enable

It appears that a driver that was supposed to create /sys/class/android_usb/android0/enable failed to load. This version claims to have a build id of 20231112200039, so I will build a fresh one from source and try that.

[532910]

While this is true, and ADB is the only working mode, it's impossible to change USB mode in settings and even impossible to set it to charging only