[pvrusb2] Is it possible to discriminate between two HVR-1950s?

[Mike Isely]

Charles:

The pvrusb2 driver itself doesn't do anything to make the device's 
serial number visible to udev.  HOWEVER, it was later discovered that 
the udev is seeing the serial number anyway, very likely because the 
number is being provided by the FX2 controller itself as part of the 
generic USB endpoint configuration data.

I had erroneously thought that I needed to provide the serial number to 
udev, when in fact it's already there.  This actually makes some sense 
because by the time the pvrusb2 driver is connected to the hardware, 
udev already knows everything it is going to know about the device.

So you should be able to construct a rule in udev to uniquely identify 
each device.

There is an old e-mail on this list that talks about this discovery.  I 
should be able to dig it up if you can't find it.

  -Mike



On Sat, 10 Apr 2010, Charles Green wrote:

> I currently have a single HVR-1950 on my system (SheevaPlug), attached 
> to our cable TV feed, working quite nicely for analog.
> 
> I need to add a second tuner to this system for over-the-air ATSC, 
> attached to an antenna in my attic.
> 
> In following this mailing list for a while, I seem to recall that 
> unique serial number information is not made available by the driver 
> for, e.g., 'udev' to be able to set up unique and consistent /dev 
> names upon reboot.  This wouldn't be a problem if all tuners got the 
> same signal feed, but in this case they won't.
> 
> It's my understanding that these USB devices would be processed in 
> whatever order they appear on the hub, not necessarily related to 
> where they're plugged in.
> 
> If it's not feasible to differentiate these, I'll probably go with 
> something like an HDHomerun; the single tuner version at least appears 
> to be cheaper than the Hauppauge unit anyway.
> 
> Thanks for any guidance you can offer.
> 
> -Charles Green
> 
> 
> 
>       
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-- 

Mike Isely
isely @ isely (dot) net
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