Re: [PATCH 0/3] Support for AF9035/AF9033

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Am Donnerstag, 23. Februar 2012 schrieb Oliver Schinagl:
> Hi Hans,
> 
> I also have an AF9035 based device, the Asus 3100 Mini Plus. It has an
> AF9035B demodulator and uses an FCI2580 tuner. I've used the driver
> supplied by afa in the past, but haven't tested it in the last few
> months. I have a git repository for that driver at
> http://git.schinagl.nl/AF903x_SRC.git (it is also linked from
> http://www.linuxtv.org/wiki/index.php/Asus_U3100_Mini_plus_DVB-T).
> 
> So when you say it is also coupled with the same tuner, that's not true
> 
> :) With that driver there where a bunch of other tuners that are used
> 
> with this chip. I think the Asus EEEPC supported a USB dvb tuner at some
> point and there are reverences in that code for it.
> 
> As of the legality of the code, that is uncertain. The module (compiled
> from all these sources) is very specifically marked as GPL. Most
> headers/source files have no copyright notice at all, some however do,
> but no license in it.
> 
> I asked about afa-tech and there driver status a while ago, but I guess
> there is no news as of yet?
> 
> To summarize, I would love to test your driver, and I think i can code
> something up for my tuner, once these are split?
> 
> Oliver
> 
> On 22-02-12 23:20, Hans-Frieder Vogt wrote:
> > I have written a driver for the AF9035&  AF9033 (called af903x), based on
> > the various drivers and information floating around for these chips.
> > Currently, my driver only supports the devices that I am able to test.
> > These are
> > - Terratec T5 Ver.2 (also known as T6)
> > - Avermedia Volar HD Nano (A867)
> > 
> > The driver supports:
> > - diversity and dual tuner (when the first frontend is used, it is in
> > diversity mode, when two frontends are used in dual tuner mode)
> > - multiple devices
> > - pid filtering
> > - remote control in NEC and RC-6 mode (currently not switchable, but
> > depending on device)
> > - support for kernel 3.1, 3.2 and 3.3 series
> > 
> > I have not tried to split the driver in a DVB-T receiver (af9035) and a
> > frontend (af9033), because I do not see the sense in doing that for a
> > demodulator, that seems to be always used in combination with the very
> > same receiver.
> > 
> > The patch is split in three parts:
> > Patch 1: support for tuner fitipower FC0012
> > Patch 2: basic driver
> > Patch 3: firmware
> > 
> > Hans-Frieder Vogt                       e-mail: hfvogt<at>  gmx .dot. net
> > --
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Hi Oliver,

the AF9035B is in fact a DVB-T demodulator with an integrated USB interface + 
further interfaces (I erroneously called it receiver). It needs a tuner to be 
a full DVB-T stick (it seems that the it9135 is basically the AF9035 + an 
integrated tuner).

the Terratec T5 Rev. 2 and T6 consists of an AF9035B, an AF9033B (Second 
demodulator) and dual FC0012 tuners
the Avermedia Volar HD Nano (A867) uses an AF9035B and an Mxl5007t tuner
your Asus 3100 mini uses the FCI2580 tuner.

If there is a driver for the FCI2580 tuner then it is not a big issue to make 
it usable with the af903x driver.

I know of these Afatech drivers, but the main disadvantage of them is in my 
eyes that they
- have a lot of useless and unused code
- define own error codes (instead of using the standard error codes)
- have a compiled in firmware
- have all supported tuners directly compiled in, which means that they 
prevent tuner support to be shared between various drivers

So, you see, there are good reasons to write a new driver for these devices.

The point with the legality: I agree that the AF903X_SRC driver is unclear in 
that respect. The glue code (under src) is explicitly marked as GPL, but the 
api code (under api) isn't marked.
Luckily, there is the it9135-driver from Jason Dong which is clearly GPL and 
which uses the same functions. Therefore there is effectivly example code from 
Afatech/Ite technology available that is under GPL.

Cheers,

Hans-Frieder Vogt                       e-mail: hfvogt <at> gmx .dot. net
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