[Gta04-owner] FM Transceiver - split frequency?

[Belisko Marek]

On Thu, Apr 12, 2012 at 11:16 PM, Andreas Kemnade <andreas at kemnade.info> wrote:
> Hi,
>
> On Thu, 2012-04-12 at 09:57 +0200, Andreas Kemnade wrote:
>> Hi,
>>
>> On Wed, 11 Apr 2012 23:53:47 +0200
>> Belisko Marek <marek.belisko at gmail.com> wrote:
>>
>> > > About the driver. the status is:
>> > > I can play audio data into the si4721. It arrives at the right pin.
>> > > Clock comes from the SoC and looks sane.
>> > Is there any driver available for that? I plan to work on FM receiver.
>> >
>> I have a userspace program to initialize the si4721 using /dev/i2c-2.
>> Thhat seems to work according to the RSSI values I get. I have an unfinished
>> patch for the 3.2 kernel for initializing McBSP1 accordingly. I'll
>> send the diff this evening, so you can help debugging.
>>
> the userspace program is at:
> http://misc.andi.de1.cc/si4721.c
>
> The kernel diff is attached (of course not cleaned up yet).
I can't compile attached diff with Neils 3.3 kernel. I got following
errors (fixes are in attachment):
sound/soc/codecs/si47xx.c:54:29: error: conflicting types for
‘soc_codec_dev_si47xx’
sound/soc/codecs/si47xx.h:29:36: note: previous declaration of
‘soc_codec_dev_si47xx’ was here

sound/soc/omap/gta04-fm.c:113:15: error: variable ‘gta04_fm_devdata’
has initializer but incomplete type
sound/soc/omap/gta04-fm.c:114:2: error: unknown field ‘card’ specified
in initializer
sound/soc/omap/gta04-fm.c:114:2: warning: excess elements in struct
initializer [enabled by default]
sound/soc/omap/gta04-fm.c:114:2: warning: (near initialization for
‘gta04_fm_devdata’) [enabled by default]
sound/soc/omap/gta04-fm.c:115:2: error: unknown field ‘codec_dev’
specified in initializer
sound/soc/omap/gta04-fm.c:115:2: warning: excess elements in struct
initializer [enabled by default]
sound/soc/omap/gta04-fm.c:115:2: warning: (near initialization for
‘gta04_fm_devdata’) [enabled by default]
sound/soc/omap/gta04-fm.c:116:2: error: unknown field ‘codec_data’
specified in initializer
sound/soc/omap/gta04-fm.c:116:2: warning: excess elements in struct
initializer [enabled by default]
sound/soc/omap/gta04-fm.c:116:2: warning: (near initialization for
‘gta04_fm_devdata’) [enabled by default]
sound/soc/omap/gta04-fm.c:113:30: warning: ‘gta04_fm_devdata’ defined
but not used [-Wunused-variable]

> arecord -D default:CARD=gta04fm
> should as far as I understand (clock has to come from the SoC) it should
> spit out data even if the si4721 is not correctly configured.
> But it does not. We should check the registers if there
> waits data to be collected and dma ist just not working.
>
> Just one hint if you read datasheets and drivers: The chip family seems
> to have different firmware versions, so that for older chips there
> are chips which have a totally different interface and newer ones. For
> the si4721 itself the problem seems not to exist. But a generic si47xx
> driver made for older ones will not work.
> Of course the userspace program should be merged with some driver in the
> kernel.
>
> Greetings
> Andreas Kemnade
>
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>

regards,

marek

-- 
as simple and primitive as possible
-------------------------------------------------
Marek Belisko - OPEN-NANDRA
Freelance Developer

Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
Tel: +421 915 052 184
skype: marekwhite
twitter: #opennandra
web: http://open-nandra.com
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