[alsa-devel] [PATCH] ASoC: dsd1791: Introduce driver for TI DSD1791 stereo codec

[Mark Brown]

On Mon, Dec 19, 2011 at 01:53:30PM -0500, Michael Williamson wrote:

> +/* DSD1791 register cache (16 through 23 are used) */
> +static const u8 dsd1791_reg[] = {
> +	[16] = 0xFF,
> +	[17] = 0xFF,
> +	[18] = 0x50,
> +	[19] = 0x00,
> +	[20] = 0x00,
> +	[21] = 0x01,
> +	[22] = 0x00,
> +	[23] = 0x00,
> +};

Use the regmap API.

> +	reg = snd_soc_read(codec, DSD1791_REG_AUDFMT);
> +	reg &= ~(DSD1791_FMT_MASK);
> +	reg |= fmt;
> +	return snd_soc_write(codec, DSD1791_REG_AUDFMT, reg);

snd_soc_update_bits().

> +static const struct snd_kcontrol_new dsd1791_snd_controls[] = {
> +	SOC_SINGLE("Left Playback Volume", DSD1791_REG_DIGATT_L, 0, 255, 0),
> +	SOC_SINGLE("Right Playback Volume", DSD1791_REG_DIGATT_R, 0, 255, 0),

This should be a single stereo control and you should supply dB data.

> +	/* enable attenuation control */
> +	reg = snd_soc_read(codec, DSD1791_REG_AUDFMT);
> +	reg |= 0x80;
> +	snd_soc_write(codec, DSD1791_REG_AUDFMT, reg);

This should probably be runtime controllable, or if it's got a good
reason for not being it should be using snd_soc_update_bits().

> +	snd_soc_add_controls(codec, dsd1791_snd_controls,
> +				ARRAY_SIZE(dsd1791_snd_controls));

Initialize the controls from the driver.