Dear all,
sorry but this is a real idiot question(s) but is it possible to use two USB
devices of the same type at the same time? i have two logitech quickcams
and would like to capture from both of them at the start. according to the
driver (which i'm helping to develop) both of the cameras have unique USB
device numbers and i can trace that both of them are being used up until the
point where the interrupts are handled. at this point only one of the
devices is receiving interrupts.
as i'm new to all of the USB stuff i've been desperately searching for an
explanation of how the interrupts are handled in the linux USB code. it
would appear from the traces that the first camera to setup for interrupts
gets all the interrupts (i.e. if i change the order of initialisation then
the interrupts go to the other cameras driver instance). is there some kind
of list which is iterated over down in the USB code that only works off the
"type" and so only sees the first registered driver?
i guess what this comes down to is: is this a problem within the USB support
under Linux or is it something incorrect in the quickcam driver in how it's
using the USB stuff?
you can probably tell that i'm not up with all this USB stuff (yet) and if
i've used the wrong terminology (i come from the normal device driver world)
then tell me what it is and i'll use that next time.
Cheers,
Matt
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