Hi Artem,
thanks for your reply
> Is this device CDC (Communication Device Class) compliant or vendor
> specific?
Vendor specific with some CDC-like details.
> What do USB descriptors look like?
output of usb_log_descr_tree
USB descriptor tree for Option N.V. Globetrotter HSUPA Modem
highest configuration found=0
Configuration #0 (Addr= 0xffffff017c918010)
String descr=<null string>
config descr: len=9 tp=2 totLen=65 numIf=2 cfgVal=1 att=0x80 pwr=250
usb_cfg_data_t shows max if=1 and 0 cv descr(s).
interface #0 (0xffffff0191d6ce08)
Alt #0 (0xffffff018004c5a0)
String descr=Data Interface
if descr: len=9 type=4 if=0 alt=0 n_ept=3 cls=255 sub=255 proto=255
usb_alt_if_data_t shows max ep=2 and 0 cv descr(s).
endpoint[0], epaddr=0x83 (0xffffff01543e8010)
len=7 type=5 attr=0x2 pktsize=64 interval=0
endpoint[1], epaddr=0x3 (0xffffff01543e8028)
len=7 type=5 attr=0x2 pktsize=64 interval=0
endpoint[2], epaddr=0x85 (0xffffff01543e8040)
len=7 type=5 attr=0x3 pktsize=16 interval=128
usb_ep_data_t shows 1 cv descr(s)
endpoint cv descriptor 0 (0xffffff015734f028), size=3
3 24
interface #1 (0xffffff0191d6ce18)
Alt #0 (0xffffff017d0f5788)
String descr=Data Interface
if descr: len=9 type=4 if=1 alt=0 n_ept=2 cls=255 sub=255 proto=255
usb_alt_if_data_t shows max ep=1 and 0 cv descr(s).
endpoint[0], epaddr=0x84 (0xffffff01812148a8)
len=7 type=5 attr=0x2 pktsize=64 interval=0
endpoint[1], epaddr=0x4 (0xffffff01812148c0)
len=7 type=5 attr=0x2 pktsize=64 interval=0
Yes, two, but that does not help.
> If you have a poorly designed vendor-specific device with multiple
> functions but no corresponding interfaces, I think the cleanest approach
> would be to implement a nexus driver, similar in purpose to usb_mid,
> that would create two interface nodes and enable you to bind two drivers.
see above: interface#0 contains two bulk and one intr ep. ep[2] (intr) is used
for serial mux rx data notification which is to be polled over the ctrl pipe.
interface#0 ep[0] and ep[1] are the network i/f endpoints.
Do you think I'd get a clean solution from this mess with three drivers?
I also don't see how I would be able to use the usba framework when a nexus
driver only passes down specific pipes plus the control pipe.
I really appreciate your ideas, but at this point I don't understand how this
would make the solution cleaner or even easier.
Nils
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