Re: [PATCH v20 33/41] ASoC: usb: Create SOC USB SND jack kcontrol

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On 4/25/2024 11:51 PM, Wesley Cheng wrote:
Expose API for creation of a jack control for notifying of available
devices that are plugged in/discovered, and that support offloading.  This
allows for control names to be standardized across implementations of USB
audio offloading.

Signed-off-by: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
---

(...)

  /* SOC USB sound kcontrols */
+/**
+ * snd_soc_usb_setup_offload_jack() - Create USB offloading jack
+ * @component: USB DPCM backend DAI component
+ * @jack: jack structure to create
+ *
+ * Creates a jack device for notifying userspace of the availability
+ * of an offload capable device.
+ *
+ * Returns 0 on success, negative on error.
+ *
+ */
+int snd_soc_usb_setup_offload_jack(struct snd_soc_component *component,
+					struct snd_soc_jack *jack)
+{
+	int ret;
+
+	ret = snd_soc_card_jack_new(component->card, "USB Offload Playback Jack",
+					SND_JACK_HEADPHONE, jack);
+	if (ret < 0) {
+		dev_err(component->card->dev, "Unable to add USB offload jack\n");
+		return ret;
+	}
+
+	ret = snd_soc_component_set_jack(component, jack, NULL);
+	if (ret) {
+		dev_warn(component->card->dev, "Failed to set jack: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_usb_setup_offload_jack);
+
  static int snd_soc_usb_get_offload_card_status(struct snd_kcontrol *kcontrol,
  				   struct snd_ctl_elem_value *ucontrol)
  {


I'm not sure if this should be handled in generic USB API, this feels like something that should be handled in specific device driver side, like all users currently do.

Anyway I think there should also be some function that tears jack down, by calling:
snd_soc_component_set_jack(component, NULL, NULL);
so it can get cleaned up properly?



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