Indeed, it looks like all entries are labeled with 115.
Code:
NovaAir:/system/usr/keylayout $ grep VOLUME_UP *
Generic.kl:key 115 VOLUME_UP
Vendor_046d_Product_b501.kl:key 115 VOLUME_UP
Vendor_046d_Product_c532.kl:key 115 VOLUME_UP
Vendor_05ac_Product_0239.kl:key 115 VOLUME_UP
Vendor_22b8_Product_093d.kl:key 115 VOLUME_UP
gpio-keys.kl:key 115 VOLUME_UP
qwerty.kl:key 115 VOLUME_UP
NovaAir:/system/usr/keylayout $
(To answer my earlier question, all "code" oughts to run under
abd shell, where
abd should be an executable to be downloaded from:
https://developer.android.com/studio...platform-tools)