USB device with multiple non-sequential interfaces

[Kevin Lloyd]

Hi all,

When I plugged in a USB device that has two interfaces that are not
sequential, say interface#1 and interface#99 I get the following error
message:
usb 2-2: config 1 has an invalid interface number: 99 but max is
1
usb 2-2: config 1 has no interface number 1

I was wondering what the reason for this is, why would it not be okay to
have multiple interfaces that are not sequentially numbered?

Also I that it still loaded the driver for the second interface, is this
maybe just a warning?

Thanks,
-Kevin

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[Alan Stern]

Post by Kevin Lloyd
Hi all,
When I plugged in a USB device that has two interfaces that are not
sequential, say interface#1 and interface#99 I get the following error
usb 2-2: config 1 has an invalid interface number: 99 but max is
1
usb 2-2: config 1 has no interface number 1
I was wondering what the reason for this is, why would it not be okay to
have multiple interfaces that are not sequentially numbered?

Because the USB spec says interfaces must be numbered sequentially
starting from 0.

Post by Kevin Lloyd
Also I that it still loaded the driver for the second interface, is this
maybe just a warning?

Yes.

Alan Stern


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[Kevin Lloyd]

Given this is a violation of the USB spec do you foresee removing
support in the future (i.e. erroring-out as opposed to just warning the
user)?

Thanks,
-Kevin

Post by Alan Stern

Post by Kevin Lloyd
Hi all,
When I plugged in a USB device that has two interfaces that are not
sequential, say interface#1 and interface#99 I get the following error
usb 2-2: config 1 has an invalid interface number: 99 but max is
1
usb 2-2: config 1 has no interface number 1
I was wondering what the reason for this is, why would it not be okay to
have multiple interfaces that are not sequentially numbered?

Because the USB spec says interfaces must be numbered sequentially
starting from 0.

Post by Kevin Lloyd
Also I that it still loaded the driver for the second interface, is this
maybe just a warning?

Yes.
Alan Stern

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[Alan Stern]

Post by Kevin Lloyd
Given this is a violation of the USB spec do you foresee removing
support in the future (i.e. erroring-out as opposed to just warning the
user)?

No, that's not going to change.

Alan Stern


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