Leveraging GPS in MC7700

[Adam Sherman]

On 2017-02-07 03:28 AM, Aleksander Morgado wrote:
> Looks like we may not be doing enough retries while probing the
> cdc-wdm port... Is there any chance you can retry but modifying
> ModemManager git master in the following way?

Will you be putting the retry increase into the build that I'm hoping
you will be uploading today. :)

In the same vein, while playing with the GPS, I notice that ttyUSB1
doesn't always appear when the driver is initialized:

Feb  8 13:36:13 sheet kernel: [ 2024.397273] usb 3-4: new high-speed USB
device number 6 using xhci_hcd
Feb  8 13:36:13 sheet kernel: [ 2024.526834] usb 3-4: config 1 has an
invalid interface number: 8 but max is 3
Feb  8 13:36:13 sheet kernel: [ 2024.526840] usb 3-4: config 1 has no
interface number 1
Feb  8 13:36:13 sheet kernel: [ 2024.528085] usb 3-4: New USB device
found, idVendor=0f3d, idProduct=68a2
Feb  8 13:36:13 sheet kernel: [ 2024.528090] usb 3-4: New USB device
strings: Mfr=3, Product=2, SerialNumber=0
Feb  8 13:36:13 sheet kernel: [ 2024.528093] usb 3-4: Product: MC7700
Feb  8 13:36:13 sheet kernel: [ 2024.528096] usb 3-4: Manufacturer:
Sierra Wireless, Incorporated
Feb  8 13:36:13 sheet kernel: [ 2024.530503] qcserial 3-4:1.0: Qualcomm
USB modem converter detected
Feb  8 13:36:13 sheet kernel: [ 2024.531160] usb 3-4: Qualcomm USB modem
converter now attached to ttyUSB0
Feb  8 13:36:13 sheet kernel: [ 2024.531785] qcserial 3-4:1.2: Qualcomm
USB modem converter detected
Feb  8 13:36:13 sheet kernel: [ 2024.531957] usb 3-4: Qualcomm USB modem
converter now attached to ttyUSB1
Feb  8 13:36:13 sheet kernel: [ 2024.532749] qcserial 3-4:1.3: Qualcomm
USB modem converter detected
Feb  8 13:36:13 sheet kernel: [ 2024.532924] usb 3-4: Qualcomm USB modem
converter now attached to ttyUSB2
Feb  8 13:36:13 sheet kernel: [ 2024.534980] qmi_wwan 3-4:1.8: cdc-wdm0:
USB WDM device
Feb  8 13:36:13 sheet kernel: [ 2024.535285] qmi_wwan 3-4:1.8 wwan0:
register 'qmi_wwan' at usb-0000:00:14.0-4, WWAN/QMI device,
0e:91:53:7e:18:d3

The "now attached to" line for ttyUSB1 is usually, but not always
present. When it is not, the character device doesn't exist.

What is initializing that? MM or the kernel itself?

A.


-- 
Adam Sherman <adam at sherman.ca>