qmi_wwan fails with error -22

[Bjørn Mork]

Martin Hauke <mardnh at gmx.de> writes:

> On 30.10.2015 21:26, Bjørn Mork wrote:
>> I'm attaching a proposed fix for qcserial, in case you feel up to some
>> driver patching.  It's not dangerous :)
>> 
>> It would be great to have this tested on more than one lt4112.  I'll
>> leave it here for a while for comments, and hopefully some testing,
>> before I send it to the usb serial maintainer for review.
>> 
>> Any comments are appreciated.  Even those questioning my sanity :)
>
>
> Your patches are working fine with the lt4112 (Firmware revision:
> 11.234.45.01.00) from my HP Z-Book 14.
>
> # dmesg -t |egrep "usb 2-6|wwan|serial"
> --------------------------------------------------------------------
> usb 2-6: new high-speed USB device number 4 using xhci_hcd
> usb 2-6: New USB device found, idVendor=03f0, idProduct=581d
> usb 2-6: New USB device strings: Mfr=2, Product=3, SerialNumber=4
> usb 2-6: Product: HP lt4112 Gobi 4G Module
> usb 2-6: Manufacturer: Hewlett-Packard
> usb 2-6: SerialNumber: 0123456789ABCDEF
> usbcore: registered new interface driver usbserial
> usbcore: registered new interface driver usbserial_generic
> usbserial: USB Serial support registered for generic
> qmi_wwan 2-6:1.4: cdc-wdm0: USB WDM device
> qmi_wwan 2-6:1.4 wwan0: register 'qmi_wwan' at usb-0000:00:14.0-6,
> WWAN/QMI device, a2:cb:29:2f:xx:xx
> usbcore: registered new interface driver qmi_wwan
> usbcore: registered new interface driver qcserial
> usbserial: USB Serial support registered for Qualcomm USB modem
> usb 2-6: Num Interfaces = 6
> usb 2-6: This Interface = 0
> usb 2-6: Huawei type serial port found (ff/01/02)
> qcserial 2-6:1.0: Qualcomm USB modem converter detected
> usb 2-6: Qualcomm USB modem converter now attached to ttyUSB0
> usb 2-6: Num Interfaces = 6
> usb 2-6: This Interface = 1
> usb 2-6: Huawei type serial port found (ff/01/03)
> qcserial 2-6:1.1: Qualcomm USB modem converter detected
> usb 2-6: Qualcomm USB modem converter now attached to ttyUSB1
> usb 2-6: Num Interfaces = 6
> usb 2-6: This Interface = 2
> usb 2-6: Huawei type serial port found (ff/01/01)
> qcserial 2-6:1.2: Qualcomm USB modem converter detected
> usb 2-6: Qualcomm USB modem converter now attached to ttyUSB2
> usb 2-6: Num Interfaces = 6
> usb 2-6: This Interface = 5
> usb 2-6: Huawei type serial port found (ff/01/05)
> qcserial 2-6:1.5: Qualcomm USB modem converter detected
> usb 2-6: Qualcomm USB modem converter now attached to ttyUSB3
> --------------------------------------------------------------------
>
> Before submitting my initial patch I tested 2 different laptop models
> having those HP-branded Huawei ME906E devices (my HP Z-Book 14 and a HP
> Envy 840 from a coworker). Those modems had firmware revision 11.x.
> Both worked out of the box with my patch and as far as I have
> seen at that time they had activated the same features/ports.
>
> Later it turned out that the layout is not static for those devices.
> HP changed the modem layout completely with firmware version 12.x to
> make it "Windows 8.1 ready".
> Nowadays most (if not all) lt4112-equipped HP-systems are shipped with
> firmware 12.x.
>
> I wanted to rewrite/fix this since some time but never got into it.
> Bjørn, thanks a lot for stepping in here.

Thanks for testing both of you!  I'll submit these patches asap.  The
qmi_wwan one should be fine.  Let's see what Johan and the other USB
experts say about the qcserial one.


Bjørn