[PATCH v2 26/28] ASoC: codecs: Add support for the framer codec

[Christophe Leroy]

Le 26/07/2023 à 17:02, Herve Codina a écrit :
> The framer codec interracts with a framer.
> It allows to use some of the framer timeslots as audio channels to
> transport audio data over the framer E1/T1/J1 lines.
> It also reports line carrier detection events through the ALSA jack
> detection feature.
> 
> Signed-off-by: Herve Codina <herve.codina at bootlin.com>

Reviewed-by: Christophe Leroy <christophe.leroy at csgroup.eu>

See below

> +static int framer_dai_hw_rule_channels_by_format(struct snd_soc_dai *dai,
> +						 struct snd_pcm_hw_params *params,
> +						 unsigned int nb_ts)
> +{
> +	struct snd_interval *c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
> +	snd_pcm_format_t format = params_format(params);
> +	struct snd_interval ch = {0};
> +
> +	switch (snd_pcm_format_physical_width(format)) {
> +	case 8:
> +		ch.max = nb_ts;
> +		break;
> +	case 16:
> +		ch.max = nb_ts / 2;
> +		break;
> +	case 32:
> +		ch.max = nb_ts / 4;
> +		break;
> +	case 64:
> +		ch.max = nb_ts / 8;
> +		break;
> +	default:
> +		dev_err(dai->dev, "format physical width %u not supported\n",
> +			snd_pcm_format_physical_width(format));
> +		return -EINVAL;
> +	}

What about

	width = snd_pcm_format_physical_width(format);

	if (width == 8 || width == 16 || width == 32 || width == 64) {
		ch.max = nb_ts * 8 / width;
	} else {
		dev_err(dai->dev, "format physical width %u not supported\n", width);
		return -EINVAL;
	}