[RFC/PATCH/RESEND] Add support to USB3 descriptors

[merez]

This patch adds support of USB3 descriptors to libusb-1.0:

• Add definitions for Endpoint Companion and BOS descriptors.
• Add APIs for parsing the Endpoint Companion and BOS descriptors.

[stuge]

I'm afraid your patch doesn't seem to have made it together with the initial ticket. Please do attach the patch. Thanks!

[hjelmn]

Looks good to me. Xiaofan or Peter please review and I will apply this to 1.0.16.

[xiaofan]

Might be able to correlate this change with usbutils which has support for USB 3.0 descriptors as well.

​https://github.com/gregkh/usbutils/blob/master/lsusb.c

[xiaofan]

Another thing is that it is better to make sure that it is compatible with FreeBSD's implementation.
​http://svnweb.freebsd.org/base/head/lib/libusb/libusb.h?view=markup
407 int libusb_parse_ss_endpoint_comp(const void *buf, int len, struct libusb_ss_endpoint_companion_descriptor ep_comp);
408 void libusb_free_ss_endpoint_comp(struct libusb_ss_endpoint_companion_descriptor *ep_comp);
409 int libusb_parse_bos_descriptor(const void *buf, int len, struct libusb_bos_descriptor bos);
410 void libusb_free_bos_descriptor(struct libusb_bos_descriptor *bos);

[hjelmn]

Good point. I see some differences and since the freebsd one is already released I will modify this patch to match and commit it for a final 1.0.16 rc.

[hjelmn]

Hmm, the freebsd parsing method doesn't fit what we would normally do in libusb. This is the problem with sitting on a patch for this long!

[hjelmn]

I modified the API, data structures, and definitions to fit what is already provided for FreeBSD. Please see:
​http://git.libusb.org/?p=libusb/libusb-darwin.git;a=commitdiff;h=7c901bb72e8c946fd84baa2b8ee24f67394c9c00;hp=55c23742dece5bed4f010d0cf44a2dddb8439d45;js=1

If there are no objections this will make it into 1.0.16.

[hjelmn]

I clean up my changes and the patch a little bit to better fit the libusb 1.0 coding style. Please see my branch for the changes and please test! I don't have many USB 3.0 devices to verify.

Peter, if you are available please take a look.

[hjelmn]

Tested 1.0.16-rc6. Works.

[hjelmn]

Reopening to track when this makes it into libusb.git

[hjelmn]

Counter proposal based off now already existing FreeBSD API