9 May
2024
9 May
'24
2:13 a.m.
Hi Pierre,
On 5/7/2024 2:33 PM, Pierre-Louis Bossart wrote:
+/**
- snd_soc_usb_device_offload_available() - Fetch BE DAI link sound card
- @dev: the device to find in SOC USB
- Finds the component linked to a specific SOC USB instance, and returns
- the sound card number for the platform card supporting offloading.
- */
+int snd_soc_usb_device_offload_available(struct device *dev) +{
- struct snd_soc_usb *ctx;
- ctx = snd_soc_find_usb_ctx(dev);
- if (!ctx)
return -ENODEV;- return ctx->component->card->snd_card->number;
+}
Presumably there's a notification to help applications discard this information on removal?
If the platform/ASoC sound card is removed then the USB BE DAI is going to be unregistered from SOC USB. This would lead to the snd_soc_find_usb_ctx() to return with -ENODEV to the USB SND offload kcontrol call.
Thanks Wesley Cheng