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

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Date:	Wed, 27 Jul 2016 00:22:29 +0300
From:	Ruslan Bilovol <ruslan.bilovol@...il.com>
To:	Clemens Ladisch <clemens@...isch.de>
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

On Tue, Jul 26, 2016 at 11:06 AM, Clemens Ladisch <clemens@...isch.de> wrote:
> 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.)

Good point, need to update documentation in next files (make similar to UAC2):
  Documentation/usb/gadget-testing.txt
  Documentation/ABI/testing/configfs-usb-gadget-uac1

Best regards,
Ruslan