Re: [linux-dvb] NXP 18211HDC1 tuner

[Michael Krufky <mkrufky@linuxtv.org>]

On Mon, Mar 10, 2008 at 12:46 PM, Michael Krufky <mkrufky@linuxtv.org> 
wrote:
>> Jarryd Beck wrote:
>>  > Would someone be interested in writing tuner drivers for the NXP
>>  > 18211HDC1 tuner?
>>  > I recently bought the Winfast DTV Dongle Gold which uses an AF9015
>>  > chip and the NXP tuner.
>>  > I've managed to get it working up to the point of needing the tuner,
>>  > after that nothing works.
>>  > I have no idea how to write tuner code, so if someone is interested, I
>>  > can supply all the
>>  > info I've got about the card and test whatever you write.
>>  >
>>  > Jarryd.
>>
>>  Try the tda18271 driver -- I am under the impression that the tda18211
>>  is a dvb-t only subset of the tda18271, but I dont have a tda18211 to
>>  test with and find out, nor do I have a tda18211 spec to look at.  :-(
>>
>>  Good Luck,
>>
>>  Mike
Jarryd Beck wrote:
> I tried that, but I wasn't sure about a few things, I was kind of making stuff
> up as I went along.
>
> Can you tell me if I've done this right?
>
> At the af9015_tuner_attach function I wrote a function
> tda18211_tuner_attach which
> calls dvb_attach. The one thing I'm not sure about is the function
> tda18271_attach
> has a parameter u8 addr. I don't know what that is supposed to do or where I am
> supposed to get it from.
>
> You can look up a datasheet from the nxp site, it appears it goes under the name
> tda18211HD, I don't know what the C1 at the end means, I'm hoping it's the same
> thing. The datasheet isn't very useful though, it pretty much only has a
> circuit diagram and a couple of numbers on it.
>
> Jarryd.
>
>   

Jarryd,

Please don't drop cc to the mailing list (added back), and also remember 
not to top quote.

The addr parameter is the i2c address of the tuner.  It is most likely 
0x60 or 0x61.

For an example of how to attach the tda18271 driver, look in 
cx23885-dvb.c for CX23885_BOARD_HAUPPAUGE_HVR1800 where alt_tuner is 1.

The datasheet on the nxp site wont help me -- i need to see the register 
map.

I think that the tda18271 driver will work with your tuner, but we may 
need to make some small adjustments.  If you look in tda18271-fe.c , 
you'll find the code that autodetects between a TDA18271c1 and a 
TDA18271c2 ...   If the autodetection fails for your tuner, you might 
want to try hardcoding it to the tda18271c1.  If that works, then I'll 
ask you to enable the register dump debug option (debug = 4) in the 
tda18271 driver and send me a dmesg snippit.  That should help us to add 
the autodetection later.

hth,

Mike


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