[alsa-devel] [PATCH] ALSA: usb-audio: Add a quirk for Nura's first gen headset

[Martin Peres]

On 14/01/18 18:05, Martin Peres wrote:
> The capture interface does not work, and the playback interface
> actually supports only 48kHz unlike what is advertised (44.1, 32, 22,
> 16, 8).
> 
> The only unknown here is if there are other devices that use the same
> product ID, but given that this ID is currently unknown, I would assume
> it is specially allocated for the nura headset.
> 
> Signed-off-by: Martin Peres <martin.peres at free.fr>

Cc: Stable <stable at vger.kernel.org>

Is there anything else I need to do? Get more testers maybe? I have
reported bugs here before (and had a nice interaction with Takashi Iwai)
but this is my first patch to this subsystem (I am an Intel/Nouveau/DRM
developer).

For more information on how I got to this patch:
http://www.mupuf.org/blog/2018/01/14/nura-headphones-on-linux/

> ---
>  sound/usb/quirks-table.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
> 
> diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
> index 8a59d4782a0f..50252046b01d 100644
> --- a/sound/usb/quirks-table.h
> +++ b/sound/usb/quirks-table.h
> @@ -3277,4 +3277,52 @@ AU0828_DEVICE(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
>  	}
>  },
>  
> +{
> +	/*
> +	 * Nura's first gen headphones use Cambridge Silicon Radio's vendor
> +	 * ID, but it looks like the product ID actually is only for Nura.
> +	 * The capture interface does not work at all (even on Windows),
> +	 * and only the 48 kHz sample rate works for the playback interface.
> +	 */
> +	USB_DEVICE(0x0a12, 0x1243),
> +	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
> +		.ifnum = QUIRK_ANY_INTERFACE,
> +		.type = QUIRK_COMPOSITE,
> +		.data = (const struct snd_usb_audio_quirk[]) {
> +			{
> +				.ifnum = 0,
> +				.type = QUIRK_AUDIO_STANDARD_MIXER,
> +			},
> +			/* Capture */
> +			{
> +				.ifnum = 1,
> +				.type = QUIRK_IGNORE_INTERFACE,
> +			},
> +			/* Playback */
> +			{
> +				.ifnum = 2,
> +				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
> +				.data = &(const struct audioformat) {
> +					.formats = SNDRV_PCM_FMTBIT_S16_LE,
> +					.channels = 2,
> +					.iface = 2,
> +					.altsetting = 1,
> +					.altset_idx = 1,
> +					.attributes = UAC_EP_CS_ATTR_FILL_MAX |
> +						UAC_EP_CS_ATTR_SAMPLE_RATE,
> +					.endpoint = 0x03,
> +					.ep_attr = USB_ENDPOINT_XFER_ISOC,
> +					.rates = SNDRV_PCM_RATE_48000,
> +					.rate_min = 48000,
> +					.rate_max = 48000,
> +					.nr_rates = 1,
> +					.rate_table = (unsigned int[]) {
> +						48000
> +					}
> +				}
> +			},
> +		}
> +	}
> +},
> +
>  #undef USB_DEVICE_VENDOR_SPEC
>