From owner-freebsd-usb@freebsd.org  Thu Nov 12 08:29:46 2015
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Subject: Re: usb modem "Can't setup transfer"
To: Alfred Perlstein <alfred@freebsd.org>, usb@freebsd.org
References: <5642B7E4.505@freebsd.org> <5642FE24.4050408@selasky.org>
 <56439C4B.6060407@freebsd.org>
From: Hans Petter Selasky <hps@selasky.org>
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Date: Thu, 12 Nov 2015 09:31:26 +0100
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On 11/11/15 20:51, Alfred Perlstein wrote:
>

Hi,

The device is very special in that it uses an interrupt type of endpoint 
for receiving the data.

>
>       Endpoint 1
>          bLength = 0x0007
>          bDescriptorType = 0x0005
>          bEndpointAddress = 0x0084  <IN>
>          bmAttributes = 0x0003  <INTERRUPT>
>          wMaxPacketSize = 0x003f
>          bInterval = 0x0002
>          bRefresh = 0x0000
>          bSynchAddress = 0x0000
>

In umodem.c you might want to change the USB matching filter to accept 
interrupt endpoints:

>         [UMODEM_BULK_RD] = {
>                 .type = UE_BULK, // change this to UE_BULK_INTR
>                 .endpoint = UE_ADDR_ANY,
>                 .direction = UE_DIR_RX,

This change will break other modem drivers, but at least it will give 
some clues if it works or not.

--HPS