[linux-dvb] New card for http://www.bttv-gallery.de/

Aidan Thornton makosoft at googlemail.com
Fri Oct 5 13:49:33 CEST 2007


Hi,

On 10/5/07, David Campbell <david at pastornet.net.au> wrote:
> I include detail for a EM2870-based USB DVB-T tuner that doesn't seem to
> work properly using fedora 7 and the em28xx drivers from
> http://mcentral.de/wiki/index.php/Em2880.  There's no brand or model
> number on the device externally or internally, box, or in the
> documentation, but the vendor code is eb1a "eMPIA Technology, Inc."

Looks like the vendor couldn't be bothered to change the USB ID from
the default. If there's no brand or model number, I suppose that's not
surprising.

> You can see photos of the device and visible chips at:
> http://www.aaa.net.au/campbell/device.jpg  (low-res)
> http://www.aaa.net.au/campbell/device_chips.jpg   (high-res)
>
> Judging from http://www.bttv-gallery.de/ the device seems to have its
> similarities to the "Compro VideoMate U3 DVB-T stick", but some of the
> eprom entries are different.

Let's see now - there's a ZL10353 DVB-T demod and a Philips 74HC4052D
analog multiplexer/demultiplexer. Somewhere on the device (possibly on
the other side of the board) there should be an em2870 and some sort
of tuner chip (probably an xc3028, as there's an i2c device at 0xc2).
I don't think it's particularly similar to the Compro VideoMate U3 -
that has a different layout and chips. The most similar card
hardware-wise is probably the Kworld 350U.

Assuming the tuner is an xc3028, it should be possible to add support
for the device. The main questions are how to detect it and what to
call it. You can try contacting Markus - he's the person behind that
particular version of the em28xx driver - but I think he's currently a
bit busy with other things. (I might be able to add support for the
device myself - I have my own version of the driver at
http://www.makomk.com/hg/v4l-dvb-makomk for various reasons - but it'd
be tricky. Do you have Windows XP and does it work under that?)

> The driver finds it but doesn't seem to recognise one of the i2c
> devices:    em28xx #0: found i2c device @ 0x16 [???]

That's the ZL10353. I think it's the analog code that's not detecting
it; it's the digital part of the driver that handles this i2c device,
and it doesn't auto-detect.

> DMESG (I don't know why the driver says it can't find the eprom, and
> then dumps the contents of the eprom)

I think it always says that when it finds a device with a generic
eMPIA USB ID and it can't recognise it, probably because the devices
that originally had this problem didn't have eproms.

Aidan



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