linux-kernel - Re: [RFC PATCH 0/5] USB Audio Gadget refactoring

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Message-ID: <162378c3-ee7a-a098-56aa-45515acf92c1@ladisch.de>
Date:	Tue, 26 Jul 2016 10:06:41 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Ruslan Bilovol <ruslan.bilovol@...il.com>
Cc:	Felipe Balbi <balbi@...nel.org>, Daniel Mack <zonque@...il.com>,
	Jassi Brar <jassisinghbrar@...il.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/5] USB Audio Gadget refactoring

Ruslan Bilovol wrote:
> On Fri, Jul 15, 2016 at 10:43 AM, Clemens Ladisch <clemens@...isch.de> wrote:
>>>> On Tue, May 24, 2016 at 2:50 AM, Ruslan Bilovol
>>>> <ruslan.bilovol@...il.com> wrote:
>>>>> it may break current usecase for some people
>>
>> And what are the benefits that justify breaking the kernel API?
>
> Main limitation with current f_uac1 design is - it can be used only on systems
> with real ALSA card present and can have only exact number of
> channels / sampling rate as sink card has. [...]
> A real cases when it's required to have UAC1 gadget represented as virtual
> sound card on gadget side: [...]

Thanks.

> Of course disadvantage of new approach for UAC1 gadget is you need to
> use some userspace application for routing audio from virtual to real
> sound card, like in case of UAC2 gadget. But thanks to existing
> applications like alsaloop it's not difficult nowadays.

I don't know what the maintainer will say, but you would increase the
chances of this change being accepted when you show a concrete example
of how to change the userspace configuration from the old to the new
driver.  (And add it to the documentation.)


Regards,
Clemens