CH7006_INPUT_FORMAT
regs[CH7006_INPUT_FORMAT] = bitf(CH7006_INPUT_FORMAT_FORMAT,
regs[CH7006_INPUT_FORMAT] |= CH7006_INPUT_FORMAT_DAC_GAIN;
regs[CH7006_INPUT_FORMAT] &= ~CH7006_INPUT_FORMAT_DAC_GAIN;
ch7006_load_reg(client, state, CH7006_INPUT_FORMAT);
ch7006_save_reg(client, state, CH7006_INPUT_FORMAT);