RT4505_ITORCH_MINUA
s->min = RT4505_ITORCH_MINUA;
val = RT4505_ITORCH_MINUA;
val = clamp_val(val, RT4505_ITORCH_MINUA, RT4505_ITORCH_MAXUA);
(val - RT4505_ITORCH_MINUA) / RT4505_ITORCH_STPUA + 1;