linux-kernel - Re: [PATCH v20 09/41] ASoC: Add SOC USB APIs for adding an USB backend

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Message-ID: <b8ff8777-6bcb-4fd7-9480-231536d23759@linux.intel.com>
Date: Fri, 26 Apr 2024 15:25:02 +0200
From: Amadeusz Sławiński
 <amadeuszx.slawinski@...ux.intel.com>
To: Wesley Cheng <quic_wcheng@...cinc.com>, srinivas.kandagatla@...aro.org,
 mathias.nyman@...el.com, perex@...ex.cz, conor+dt@...nel.org,
 corbet@....net, lgirdwood@...il.com, andersson@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, gregkh@...uxfoundation.org,
 Thinh.Nguyen@...opsys.com, broonie@...nel.org, bgoswami@...cinc.com,
 tiwai@...e.com, robh@...nel.org, konrad.dybcio@...aro.org
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-sound@...r.kernel.org, linux-usb@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-doc@...r.kernel.org,
 alsa-devel@...a-project.org
Subject: Re: [PATCH v20 09/41] ASoC: Add SOC USB APIs for adding an USB
 backend

On 4/25/2024 11:50 PM, Wesley Cheng wrote:
> Some platforms may have support for offloading USB audio devices to a
> dedicated audio DSP.  Introduce a set of APIs that allow for management of
> USB sound card and PCM devices enumerated by the USB SND class driver.
> This allows for the ASoC components to be aware of what USB devices are
> available for offloading.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> ---

(...)

> +const char *snd_soc_usb_get_components_tag(bool playback)
> +{
> +	if (playback)
> +		return "usbplybkoffld: 1";
> +	else
> +		return "usbcapoffld: 1";
> +}
> +EXPORT_SYMBOL_GPL(snd_soc_usb_get_components_tag);

Is this used to expose some information to userspace?
Can those be some more readable strings if so, like:
usbplaybackoffload, usbcaptureoffload

(...)

> +
> +	node = snd_soc_find_phandle(usbdev);
> +	if (IS_ERR(node))
> +		return -ENODEV;
> +
> +	ctx = snd_soc_find_usb_ctx(node);
> +	of_node_put(node);
> +	if (!ctx)
> +		return -ENODEV;

Perhaps introduce some helper function, you do this 
snd_soc_find_phandle() followed by snd_soc_find_usb_ctx() in few places...