[linux-dvb] mxl5005s tuner analog support

Andreas linuxdreas at dslextreme.com
Fri Jan 16 17:32:35 CET 2009


Am Freitag, 26. Dezember 2008 19:08:29 schrieb Devin Heitmueller:
> On Fri, Dec 26, 2008 at 6:10 PM, Andy Walls <awalls at radix.net> wrote:
> > On Fri, 2008-12-26 at 16:48 -0500, Devin Heitmueller wrote:
> >> Hello,
> >>
> >> I working on the analog support for the Pinnacle Ultimate 880e
> >> support, and that device includes an mxl5005s tuner.
> >>
> >> I went to do the normal changes to em28xx to support another
> >> tuner, which prompted me to wonder:
> >>
> >> Is the analog support known to to work in Linux for this tuner for
> >> any other device?
> >>
> >> The reason I ask is because I hit an oops and when I looked at the
> >> source I found some suspicious things:
> >>
> >> * No entry in tuner.h
> >> * No attach command in tuner-core.c
> >> * No definition of set_analog_params() callback in mxl5005s.c
> >
> > The mxl5005s support was added to the v4l-dvb repo by Steven Toth
> > for the HVR-1600 which uses it exclusively for ATSC (QAM and
> > 8-VSB).
> >
> > The source of Steve's driver is from RealTek.  More comments on
> > origin can be found in the mxl5005s.[ch] files.
> >
> > There is some history in the list archives between Steve and Manu
> > (and me indirectly) on the use of the mxl500x source module.
> >
> >> I wonder if perhaps the driver was ported from some other source
> >> and nobody ever got around to getting the analog support working? 
> >> If that's the case then that is fine (I'll make it work), but I
> >> want to know if I am just missing something obvious here....
> >
> > I'd like to get the driver working a little better myself.  Steve
> > said the QAM suffers a 3 dB hit compared to Manu's version (IIRC). 
> > I'd like a decent signal strength readout.   If I had a data sheet
> > from MaxLinear maybe I could do something.  It still looks like
> > details of external tracking filter hardware need to be known and
> > tested for each particular board though.
> >
> > Regards,
> > Andy
>
> Thanks for the feedback.  I just wanted a sanity check that I wasn't
> missing something obvious.  I'll take a look at the code, as well as
> the original RealTek code and see if I can get the analog side
> working.
>
> I'll send some emails and see if I can get the datasheet - I didn't
> ask for it when I started the work since I was under the impression
> that the driver was mature.
>
> Devin

I seem to be affected by that 3db loss between the old mxl500x and the 
mxl5005s driver. Did you ever get the datasheets and is anyone perhaps 
even working on squeezing a little more out of the driver?

-- 
Gruß
Andreas



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