Re: [alsa-devel] [PATCH] ASoC: nau8825: add programmable biquad filter control

On Tue, May 31, 2016 at 11:57:41AM +0800, John Hsu wrote:

• if (!component->regmap)

• return -EINVAL;
  

• regmap_raw_read(component->regmap, NAU8825_REG_BIQ_COF1,

• ucontrol->value.bytes.data, params->max);
  

• return 0;

You should really check the return code from regmap, especially for larger block transfers where some controllers may have limitations.