RE: [alsa-devel] WL1273 FM Radio driver...

From: "Bensaid, Selma" <selma.bensaid@intel.com>
To: Peter Ujfalusi <peter.ujfalusi@nokia.com>,
	ext Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
	"sameo@linux.intel.com" <sameo@linux.intel.com>,
	ext Mark Brown <broonie@opensource.wolfsonmicro.com>,
	"hverkuil@xs4all.nl" <hverkuil@xs4all.nl>,
	"matti.j.aaltonen@nokia.com" <matti.j.aaltonen@nokia.com>,
	"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
	"lrg@slimlogic.co.uk" <lrg@slimlogic.co.uk>
Subject: RE: [alsa-devel] WL1273 FM Radio driver...
Date: Tue, 8 Feb 2011 10:09:33 +0000	[thread overview]
Message-ID: <2A84145621092446B6659B8A0F28E26F47010C29F1@irsmsx501.ger.corp.intel.com> (raw)
In-Reply-To: <4D5109B3.60504@nokia.com>

> The wl1273 as such is designed for embedded systems.
> It can be connected in several ways to the system:
> - analog only
> In this way the RX/TX is connected to some codec's Line IN/OUT
> For this to work, we don't need any audio driver for the FM chip
> (basically the same configuration as rx51 has in regards of FM radio)
> 
> - Digital interfaces
> The I2S lines are connected to the main processor. In this way the
> wl1273 acts as a codec.
> In order to provide platform independent driver we need to use ASoC
> framework. ASoC have broad main processor side support, and it is easy
> to switch the arch, if we have proper ASoC codec driver for the wl1273.
> It is also better to keep the codec implementation under
> sound/soc/codecs.
> 
2 Digital interfaces are possible for FM WL1273:
- the external connection: the I2S lines are used for the FM PCM samples
- the internal connection: the BT PCM interface is used for the FM PCM samples
For both configuration we have a set of HCI commands to configure the FM audio 
path and one of my concerns is to know if the wl1273_codec should handle the audio path configuration 
and the switch between FM and BT SCO?

> I have not looked deeply into the wl1273 datasheets, but I'm sure
> there's a way to nicely divide the parts between the MFD, V4L, and ASoC.
> 
> --
> Péter
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> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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