From: Hans Verkuil <hverkuil@xs4all.nl>
To: shuah <shuah@kernel.org>, mchehab@kernel.org
Cc: Takashi Iwai <tiwai@suse.de>,
perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org
Subject: Re: [alsa-devel] [PATCH v9 4/4] sound/usb: Use Media Controller API to share media resources
Date: Fri, 11 Jan 2019 15:59:54 +0100 [thread overview]
Message-ID: <f13637a7-5c15-ba43-9929-78fef09e54fb@xs4all.nl> (raw)
In-Reply-To: <5f9588b5-657a-78ee-9614-ed0ef1fc5839@kernel.org>
On 1/11/19 3:57 PM, shuah wrote:
> On 12/19/18 6:51 AM, Takashi Iwai wrote:
>> On Tue, 18 Dec 2018 18:59:39 +0100,
>> shuah@kernel.org wrote:
>>>
>>> From: Shuah Khan <shuah@kernel.org>
>>>
>>> Media Device Allocator API to allows multiple drivers share a media device.
>>> This API solves a very common use-case for media devices where one physical
>>> device (an USB stick) provides both audio and video. When such media device
>>> exposes a standard USB Audio class, a proprietary Video class, two or more
>>> independent drivers will share a single physical USB bridge. In such cases,
>>> it is necessary to coordinate access to the shared resource.
>>>
>>> Using this API, drivers can allocate a media device with the shared struct
>>> device as the key. Once the media device is allocated by a driver, other
>>> drivers can get a reference to it. The media device is released when all
>>> the references are released.
>>>
>>> Change the ALSA driver to use the Media Controller API to share media
>>> resources with DVB, and V4L2 drivers on a AU0828 media device.
>>>
>>> The Media Controller specific initialization is done after sound card is
>>> registered. ALSA creates Media interface and entity function graph nodes
>>> for Control, Mixer, PCM Playback, and PCM Capture devices.
>>>
>>> snd_usb_hw_params() will call Media Controller enable source handler
>>> interface to request the media resource. If resource request is granted,
>>> it will release it from snd_usb_hw_free(). If resource is busy, -EBUSY is
>>> returned.
>>>
>>> Media specific cleanup is done in usb_audio_disconnect().
>>>
>>> Signed-off-by: Shuah Khan <shuah@kernel.org>
>>
>> Feel free to take my ack regarding the sound stuff:
>> Reviewed-by: Takashi Iwai <tiwai@suse.de>
>>
>>
>> Thanks!
>>
>> Takashi
>>
>
> Hi Mauro,
>
> Any update on this patch series?
I'm planning to process this series for 5.1. Haven't gotten around to it yet,
but I expect to do this next week.
Still going through all the pending patches after the Christmas period :-)
Regards,
Hans
next prev parent reply other threads:[~2019-01-11 15:00 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-18 17:59 [PATCH v9 0/4] Media Device Allocator API shuah
2018-12-18 17:59 ` [PATCH v9 1/4] media: " shuah
2018-12-18 17:59 ` [PATCH v9 2/4] media: change au0828 to use " shuah
2018-12-18 17:59 ` [PATCH v9 3/4] media: media.h: Enable ALSA MEDIA_INTF_T* interface types shuah
2018-12-18 17:59 ` [PATCH v9 4/4] sound/usb: Use Media Controller API to share media resources shuah
2018-12-19 13:51 ` [alsa-devel] " Takashi Iwai
2019-01-11 14:57 ` shuah
2019-01-11 14:59 ` Hans Verkuil [this message]
2019-01-11 15:04 ` shuah
2019-01-18 8:36 ` Hans Verkuil
2019-01-18 21:54 ` shuah
2019-01-19 1:03 ` shuah
2019-01-19 10:30 ` Hans Verkuil
2019-01-20 19:32 ` shuah
2019-01-21 14:46 ` [PATCH v9 0/4] Media Device Allocator API Hans Verkuil
2019-01-24 1:35 ` shuah
2019-01-24 7:30 ` Hans Verkuil
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