3d Control pad : analog shoulders are not working properly

[willll]

I mapped the 2 shoulder triggers to a PS3 Pad Analog Triggers, and :

• 
  RTRG and LTRG are not managed at all
• 
  The trigger position is actually populated, but with values starting from 128 to 255 then wrapping around from 0 to 127 (totally pulled)

What's the full name of the game (including region) ?
N\A

What's your frontend ? (standalone, libretro, ...) ?
N\A

What's your OS ? (windows, linux, OSX, ...) ?
Linux Ubuntu 'Retarded Cockroach"

What's your hardware ? (CPU, GPU, ...) ?
N/A

What's the storage type of the game (official cd, burned cd or cd image) ?
ISO+CUE

If applicable, what's the format of your cd image ? (cue/bin, ccd/img, iso, chd, ...)
ISO+CUE

Are you using any setting different from default ? If so, precise
3D Control Pad enabled and configured on Port1:1

Did this game work previously ? Do you remember when ? Is it happening with other games ?
N/A

If applicable, provide error messages, logs, screenshots, or whatever additional information that could help debugging this
N/A