[PATCH v1 2/4] ASoC: simple-card-utils: create jack inputs for aux_devs

[Amadeusz Sławiński]

On 1/18/2023 1:52 PM, Astrid Rost wrote:
> Add a generic way to create jack inputs for auxiliary jack detection
> drivers (e.g. via i2c, spi), which are not part of any real codec.
> The simple-card can be used as combining card driver to add the jacks,
> no new one is required.
> 
> Create a jack (for input-events) for jack devices in the auxiliary
> device list (aux_devs). A device which has the functions set_jack and
> get_jack_supported_type counts as jack device.
> 
> Add a devicetree entry, in case not all input types are required.
>   simple-card,aux-jack-types:
> Array of snd_jack_type to create jack-input-event for jack devices in
> aux-devs. If the setting is 0, the supported type of the device is used.
> 
> Signed-off-by: Astrid Rost <astrid.rost at axis.com>
> ---
>   include/sound/simple_card_utils.h     |  3 ++
>   sound/soc/generic/simple-card-utils.c | 63 +++++++++++++++++++++++++++
>   sound/soc/generic/simple-card.c       |  4 ++
>   3 files changed, 70 insertions(+)
> 
> diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
> index 38590f1ae9ee..a3f3f3aa9e6e 100644
> --- a/include/sound/simple_card_utils.h
> +++ b/include/sound/simple_card_utils.h
> @@ -69,6 +69,7 @@ struct asoc_simple_priv {
>   	} *dai_props;
>   	struct asoc_simple_jack hp_jack;
>   	struct asoc_simple_jack mic_jack;
> +	struct snd_soc_jack *aux_jacks;
>   	struct snd_soc_dai_link *dai_link;
>   	struct asoc_simple_dai *dais;
>   	struct snd_soc_dai_link_component *dlcs;
> @@ -187,6 +188,8 @@ int asoc_simple_parse_pin_switches(struct snd_soc_card *card,
>   int asoc_simple_init_jack(struct snd_soc_card *card,
>   			       struct asoc_simple_jack *sjack,
>   			       int is_hp, char *prefix, char *pin);
> +int asoc_simple_init_aux_jacks(struct asoc_simple_priv *priv,
> +				char *prefix);
>   int asoc_simple_init_priv(struct asoc_simple_priv *priv,
>   			       struct link_info *li);
>   int asoc_simple_remove(struct platform_device *pdev);
> diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
> index e35becce9635..668123549fbf 100644
> --- a/sound/soc/generic/simple-card-utils.c
> +++ b/sound/soc/generic/simple-card-utils.c
> @@ -786,6 +786,69 @@ int asoc_simple_init_jack(struct snd_soc_card *card,
>   }
>   EXPORT_SYMBOL_GPL(asoc_simple_init_jack);
>   
> +int asoc_simple_init_aux_jacks(struct asoc_simple_priv *priv, char *prefix)
> +{
> +	struct snd_soc_card *card = simple_priv_to_card(priv);
> +	struct device *dev = card->dev;
> +	struct snd_soc_component *component;
> +	char prop[128];
> +	int found_jack_index = 0;
> +	int num = 0;
> +	int ret;
> +
> +	if (priv->aux_jacks)
> +		return 0;
> +
> +	snprintf(prop, sizeof(prop), "%saux-jack-types", prefix);
> +	num = of_property_count_u32_elems(dev->of_node, prop);
> +	if (num < 1)
> +		return 0;
> +
> +	priv->aux_jacks = devm_kcalloc(card->dev, num,
> +				       sizeof(struct snd_soc_jack), GFP_KERNEL);
> +	if (!priv->aux_jacks)
> +		return -ENOMEM;
> +
> +	for_each_card_auxs(card, component) {
> +		if (found_jack_index >= num)
> +			break;
> +
> +		if (component->driver->set_jack &&
> +		    component->driver->get_jack_supported_type) {

This check is really weird, you are checking if callbacks exist at all, 
which should be unnecessary as it duplicates the work oh 
snd_soc_component_ functions. I would just try to call 
snd_soc_component_get_jack_supported_type() directly and if it returns 
-ENOTSUPP, just go to next iteration.
I guess your main problem is snd_soc_component_set_jack(), but you can 
just call it with NULL jack to check if it returns -ENOTSUPP, but I 
guess the overall asumption would be that if someone implements 
.get_jack_supported_type, they also implemented .set_jack, so maybe it 
is just unnecessary?

> +			char id[128];
> +			int type = 0;
> +			struct snd_soc_jack *jack =
> +				&(priv->aux_jacks[found_jack_index]);
> +			int type_supp_mask =
> +				snd_soc_component_get_jack_supported_type(
> +					component);
> +
> +			ret = of_property_read_u32_index(
> +				dev->of_node, prop, found_jack_index++, &type);
> +			if (ret)
> +				continue;
> +
> +			if (type)
> +				type &= type_supp_mask; /* use only supported types */
> +			else
> +				type = type_supp_mask; /* use all supported types */
> +
> +			if (!type)
> +				continue;
> +
> +			/* create jack */
> +			snprintf(id, sizeof(id), "%s-jack", component->name);
> +			ret = snd_soc_card_jack_new(card, id, type, jack);
> +			if (ret)
> +				continue;
> +
> +			(void)snd_soc_component_set_jack(component, jack, NULL);
> +		}
> +	}
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(asoc_simple_init_aux_jacks);
> +
>   int asoc_simple_init_priv(struct asoc_simple_priv *priv,
>   			  struct link_info *li)
>   {
> diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
> index feb55b66239b..e98932c16754 100644
> --- a/sound/soc/generic/simple-card.c
> +++ b/sound/soc/generic/simple-card.c
> @@ -623,6 +623,10 @@ static int simple_soc_probe(struct snd_soc_card *card)
>   	if (ret < 0)
>   		return ret;
>   
> +	ret = asoc_simple_init_aux_jacks(priv, PREFIX);
> +	if (ret < 0)
> +		return ret;
> +
>   	return 0;
>   }
>