Am Dienstag, 8. Mai 2012, 16:09:31 schrieb Alexander Stein:
> Hello,
>
> I have a H24 modem which is configured in with "AT+MCONN=4" to use 2
> interfaces for Data and Control. The Data interface is used by cdc_acm and
> works find, but the control interface generates the following error messages
> each time the driver/device binding happens.
> [ 47.985329] cdc_acm 8-1:1.0: ttyACM1: USB ACM device
> [ 47.992386] cdc_acm 8-1:1.2: Zero length descriptor references
> [ 47.998417] cdc_acm: probe of 8-1:1.2 failed with error -22
>
> The control interface can be used by usbserial as referenced in the "H24 AT
> Commands Refernece Guide" using
> > modprobe usbserial vendor=0x22b8 product=0x2d93
>
> Is there a way either cdc_acm can use the Control interface or silently ignore
> it?
This is possible, but not necessarily sensible. It depends on whether the device
sends notifications. Please add it to this list:
static const struct usb_device_id acm_ids[] = {
/* quirky and broken devices */
{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@xxxxxxxxx */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
with a NO_UNION_NORMAL quirk and retest.
Regards
Oliver
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