Re: [PATCH v2] add support for DeLOCK-USB-2.0-DVB-T-Receiver-61744

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On 05/04/2012 03:49 PM, Gianluca Gennari wrote:
> Hi poma,
> thanks for the very interesting links.
> 
;)

> Il 04/05/2012 03:27, poma ha scritto:
>> On 05/03/2012 11:03 AM, Gianluca Gennari wrote:
>>> Hi poma,
>>> I have a 0BDA:2838 (Easycap EZTV646) and a 0BDA:2832 (no name 20x20mm
>>> mini DVB-T stick) and both are based on the E4000 tuner, which is not
>>> supported in the kernel at the moment.
>>> I have no idea if there are sticks with the same USB PID and the fc0012
>>> tuner.
>>
>> OK, second one - no name device is "Realtek RTL2832U reference design"**.
>>
>> First one:
>> Once upon a time there was a "EasyCAP"�
>> "After while crocodile!"
>> �and "EzCAP" was born.
>> http://szforwardvideo.en.alibaba.com/aboutus.html
>> Obviously Easycap EZTV646 != EzCAP EzTV646
>> http://www.reddit.com/r/RTLSDR/comments/s6ddo/rtlsdr_compatibility_list_v2_work_in_progress/
>> ezcap EzTV646	0BDA:2838	RTL2832U/FC0012		Some revisions may have the E4000*
>> http://i.imgur.com/mFD1X.jpg
>> (Generic)	0BDa:2838	RTL2832U/E4000*
>> �
>> And, in addition:
>> http://sdr.osmocom.org/trac/wiki/rtl-sdr
>> 0x0bda	0x2832	all of them	Generic RTL2832U (e.g. hama nano)**
>> 0x0bda	0x2838	E4000	ezcap USB 2.0 DVB-T/DAB/FM dongle
>> �
>> Maybe?
>> https://sites.google.com/site/myrtlsdr/
> 
> That's it. Opening the device enclosure, I can read this on the PCB:
> "EzTV668 1.0"
> and it looks identical to the picture posted there.
> 
Groovy!

>> "EzCap EZTV646 has got RTL2832U/FC0012. However rtl-sdr must be tweaked
>> to force FC0012 tuner because it has the same PID as EZTV668 (PID:
>> 0x2838) so running it whithout a tweak will select Elonics E4000 tuner.
>> Works, not so good at filtering."
>> �
>> Conclusion:
>> At least two devices share same vid/pid with different tuners - fc0012
>> vs e4000.
>> How to resolve this from a drivers perspective in a proper way?
> 
> This is not a big problem: the rtl2832 driver should read the tuner type
> from an internal register and load the proper module (or exit with an
> error message if the tuner is unsupported).
> 
Ack, thanks!

>> Beside,
>> there is GPL'ed 'e4k' tuner source code aka 'e4000 improved'*** (Elonics
>> E4000)
>> by Harald Welte
>> http://cgit.osmocom.org/cgit/osmo-sdr/tree/firmware/src/tuner_e4k.c
>> http://sdr.osmocom.org/trac/
>> http://sdr.osmocom.org/trac/wiki/rtl-sdr
>> http://wiki.spench.net/wiki/RTL2832U***
> 
> Very nice. So we should ask Harald Welte if he is willing to have his
> driver merged in the kernel.
>
Undoubtedly!
Please ping Thomas and Antti, accordingly.

>> regards,
>> poma
>>
> 
> Regards,
> Gianluca

regards,
poma
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