Carsten: I just learned something interesting that you'll want to know. The serial number *is* in fact already available in the USB configuration data. Thus you can do what Mauro is suggesting to identify the device: Use the bus_info field to find the udev-populated device node in /sys and then walk that to find the serial number.
The reason I had never considered this is because the device's serial number is stored in its ROM, encoded in a format that is specific to Hauppauge and has nothing to do with USB. The pvrusb2 driver reads this by using the tveeprom module to parse the data. Since the pvrusb2 driver then never does anything with the result except to use it as the root node in its own sysfs interface, I had concluded that it wasn't available any other way. However it is in fact present in the USB configuration data. Just run the usbview generic tool and you'll see it. You'll see a field labeled "Serial Number:" and its value will be of the form "mmmm-xx-yyyyyyyy". The "mmmm" appears to match the model type, but the "yyyyyyyy" is an 8 digit hex number that when converted to decimal will match the number that the pvrusb2 driver puts in its sysfs interface. (The "xx" part appears to just be a pair of constant zeroes.) Why is this? Well I can't prove it, but I can think of two possibilities for how the serial number could have found its way into the USB configuration data without any help from the pvrusb2 driver: First the USB config data is also in that ROM - this is where the manufacturer and device ID are initially coded of course. But that's a different part of the ROM, formatted in a manner that the FX2 processor's factory ROM initialization can directly read, i.e. this part is not specific to Hauppauge. So it's possible that the serial number is actually written in two places. A second possibility is that the FX2 is able to directly reinitialize its USB interface as it comes up. It can write its own configuration data. So it's theoretically possible that the Hauppauge-supplied FX2 firmware is itself accessing the nearby Hauppauge ROM, extracting the serial number, and then stuffing it in to the USB configuration data. However until now I've never seen any actual evidence that the FX2 firmware will directly read that ROM (rather, the host driver reads it). But either way that would explain things. -Mike -- Mike Isely isely @ pobox (dot) com PGP: 03 54 43 4D 75 E5 CC 92 71 16 01 E2 B5 F5 C1 E8 _______________________________________________ pvrusb2 mailing list [email protected] http://www.isely.net/cgi-bin/mailman/listinfo/pvrusb2
