as3935_write
as3935_write(st, AS3935_AFE_GAIN, val << 1);
as3935_write(st, AS3935_DEFAULTS, 0x96);
as3935_write(st, AS3935_CALIBRATE, 0x96);
as3935_write(st, AS3935_TUNE_CAP,
as3935_write(st, AS3935_TUNE_CAP, (st->tune_cap / TUNE_CAP_DIV));
as3935_write(st, AS3935_NFLWDTH, st->nflwdth_reg);
ret = as3935_write(st, AS3935_AFE_GAIN, val);
ret = as3935_write(st, AS3935_AFE_GAIN, val);