Re: [RFC PATCH v2 11/22] ASoC: qcom: Add USB backend ASoC driver for Q6

On 1/25/23 21:14, Wesley Cheng wrote:

Create a USB BE component that will register a new USB port to the ASoC USB framework. This will handle determination on if the requested audio profile is supported by the USB device currently selected.

Can you clarify how? because ...

+static struct snd_soc_dai_driver q6usb_be_dais[] = {

• {

• .playback = {
  

• 	.stream_name = "USB BE RX",
  

• 	.rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
  

• 		SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |
  

• 		SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
  

• 		SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |
  

• 		SNDRV_PCM_RATE_192000,
  

• 	.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
  

• 		SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |
  

• 		SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |
  

• 		SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE,
  

• 	.channels_min = 1,
  

• 	.channels_max = 2,
  

• 	.rate_max =     192000,
  

• 	.rate_min =	8000,
  

• },
  

• .id = USB_RX,
  

• .name = "USB_RX_BE",
  

• .ops = &q6usb_ops,
  

• },

+};

... here I see a single DAI, so presumably ONE endpoint can be supported?

I didn't see in the rest of the code how a card with multiple endpoint would be rejected, nor how the capabilities are checked?