On Monday 30 of September 2013 13:12:34 Bjørn Mork wrote:
> Michal Malý <madcatxster@xxxxxxxxx> writes:
> > On Monday 30 of September 2013 12:19:41 you wrote:
> >> Michal Malý <madcatxster@xxxxxxxxx> writes:
> >> > my Huawei 3G modem has an embedded Smart Card reader which causes
> >> > trouble when the modem is being detected (a bunch of "<warn>
> >> > (ttyUSBx): open blocked by driver for more than 7 seconds!" in
> >> > messages.log). This trivial patch corrects the problem for me. The
> >> > modem identifies itself as "12d1:1406 Huawei Technologies Co.,
> >> > Ltd. E1750" in lsusb although the description on the body says "Model
> >> > E173u-1"
> >>
> >> This is surprising because the first thing option_probe() does is:
> >> /* Never bind to the CD-Rom emulation interface */
> >> if (iface_desc->bInterfaceClass == 0x08)
> >>
> >> return -ENODEV;
> >>
> >> so it shouldn't ever bind to any storage functions. Unless it is a
> >> vendor specific storage function, of course...
> >>
> >> > + { USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID,
> >
> > HUAWEI_PRODUCT_E1750,
> >
> >> > 0xff, 0xff, 0xff), + .driver_info = (kernel_ulong_t)
> >> > &net_intf2_blacklist },
> >>
> >> Does this mean that intf #2 is actually a storage function using
> >> ff/ff/ff class codes?
> >>
> >>
> >> Bjørn
> >
> > The device has 4 interfaces. IF 0 and IF 1 are used to talk to the modem,
> > IF 3 is a micro SD card reader and IF 2 is a mysterious interface.
> > According to Windows .INF the "USB\VID_12d1&PID_1406&MI_02" device is a
> > "HUAWEI Mobile Connect - USB Smart Card Reader"; whatever that means. The
> > SD card reader has 0x08 interface class and it seems to be picked up
> > correctly.
>
> Yes, that's what I thought. So intf #2 probably doesn't have anything
> to do with the SD reader?
>
> > IF 2 info from lsusb:
> >
> > Interface Descriptor:
> > bLength 9
> > bDescriptorType 4
> > bInterfaceNumber 2
> > bAlternateSetting 0
> > bNumEndpoints 2
> > bInterfaceClass 255 Vendor Specific Class
> > bInterfaceSubClass 255 Vendor Specific Subclass
> > bInterfaceProtocol 255 Vendor Specific Protocol
> > iInterface 0
> > ** UNRECOGNIZED: 36 21 00 01 00 07 00 00 03 00 00 00 a0 0f 00 00 a0
> > 0f
> >
> > 00 00 00 00 00 00 00 2a 00 00 16 40 05 00 00 00 00 00 fe 00 00 00 00 00 00
> > 00 00 00 00 00 30 02 01 00 0f 01
>
> Right. Based on the length and ID of this class descriptor, I am pretty
> sure this is a CCID interface descriptor, except that the class codes
> are wrong. You could hack up a copy of lsusb to decode the vendor
> specific class as if it was USB_CLASS_CCID and have this additional
> descriptor nicely decoded into CCID properties.
>
> I believe some modems provide a CCID interface to the SIM. Could this
> be such a device?
>
> In any case, I guess the patch is necessary. This interface should be
> blacklisted as it's not a serial interface. CCID support is done in
> userspace. Thanks a lot for providing the additional info.
>
>
>
> Bjørn
The interface is indeed for a CCID reader. The information contained in the descriptor are probably not useful for the purposes of the "option" driver, but here's what I got form a libusb-based CCID parser.
idVendor: 0x12D1
iManufacturer: HUAWEI Technology
idProduct: 0x1406
iProduct: HUAWEI Mobile
bcdDevice: 0.00 (firmware release?)
bLength: 9
bDescriptorType: 4
bInterfaceNumber: 2
bAlternateSetting: 0
bNumEndpoints: 2
bulk-IN and bulk-OUT
bInterfaceClass: 0xFF
NOT A CCID DEVICE
Class is 0xFF (proprietary)
bInterfaceSubClass: 255
UNSUPPORTED SubClass
bInterfaceProtocol: 255
UNSUPPORTED InterfaceProtocol
Can't get iInterface string
CCID Class Descriptor
bLength: 0x36
bDescriptorType: 0x21
bcdCCID: 1.00
bMaxSlotIndex: 0x00
bVoltageSupport: 0x07
5.0V
3.0V
1.8V
dwProtocols: 0x0003 0x0000
dwDefaultClock: 262144.000 MHz
dwMaximumClock: 262144.000 MHz
bNumClockSupported: 0 (will use whatever is returned)
IFD does not support GET CLOCK FREQUENCIES request: Resource temporarily unavailable
dwDataRate: 0 bps
dwMaxDataRate: 2752512 bps
bNumDataRatesSupported: 0 (will use whatever is returned)
IFD does not support GET_DATA_RATES request: Resource temporarily unavailable
dwMaxIFSD: 344086
dwSynchProtocols: 0x00000000
dwMechanical: 0x000000FE
Card ejection mechanism
Card capture mechanism
Card lock/unlock mechanism
dwFeatures: 0x00000000
No special characteristics
00.... Character level exchange
dwMaxCCIDMessageLength: 0 bytes
bClassGetResponse: 0x30
bClassEnvelope: 0x02
wLcdLayout: 0x0001
1 characters per line
bPINSupport: 0x0F
PIN Verification supported
PIN Modification supported
bMaxCCIDBusySlots: 1
Michal
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