> Eric HENRY wrote:
>
> Yes, in fact it depends on how is implemented your driver.
> You can see "driver/usb/scanner.c" in your kernel sources to find how to
> improve your webcam driver for it to handle many cams...
i think maybe my first email wasn't quite right (told you i was new to all
of this). the driver creates an PIPE_ISOCHRONOUS for reading the streaming
image data from a camera. the machine i'm running on uses usb-uchi.
i bunged some debug code into the usb-uhci.c file and found that in my kernel
source (2.2.18) and found that both cameras are coming into process_iso()
in this file. however, the second camera that was opened returns on line
2374 (a "return -EXDEV" line) because (desc->hw.td.status & TD_CTRL_ACTIVE)
is non-zero. because this returns -EXDEV the driver code that handles the
completion doesn't get called for the second camera.
so i took a look at scanner.c and it would appear that this uses a different
method to the quickcam driver.
now the question i guess is: anyone got any good (entry level) linux USB
programming guides so that i can work out what to do here? or can someone
suggest what might the problem (from my really poor description!)?
Cheers,
Matt
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