I was inspired by https://forum.openwrt.org/viewtopic.php?id=64680
to finally do something about this issue...
The primary show stopper is that the MTK2 MBIM firmware does not support
1024 bytes MBIM requests. The MBIM descriptor wMaxControlMessage is 512:
bjorn@nemi:~$ lsusb -vd 2001:7d01|sed -ne /MBIM/,+7p
CDC MBIM:
bcdMBIMVersion 1.00
wMaxControlMessage 512
bNumberFilters 16
bMaxFilterSize 64
wMaxSegmentSize 1500
bmNetworkCapabilities 0x20
8-byte ntb input size
This makes umbim OPEN fail because the modem refuse the default
hardcoded 1024 bytes buffer size:
bjorn@nemi:/usr/local/src/git/umbim$ ./umbim -d /dev/cdc-wdm2 -v -n caps
sending (16): 01 00 00 00 10 00 00 00 01 00 00 00 00 04 00 00
header_type: 0001
header_length: 0010
header_transaction: 0001
reading (16): 04 00 00 80 10 00 00 00 01 00 00 00 08 00 00 00
header_type: 80000004
header_length: 0010
header_transaction: 0001
sending (16): 02 00 00 00 10 00 00 00 02 00 00 00 08 00 00 00
header_type: 0002
header_length: 0010
header_transaction: 0002
reading (16): 02 00 00 80 10 00 00 00 02 00 00 00 02 00 00 00
header_type: 80000002
header_length: 0010
header_transaction: 0002
The same problem is likely to affect other MBIM firmwares. I believe some
Ericsson modems also use 512 byte control messages.
Fix by dynamically allocating the message buffer, and getting the proper
size from the driver. We could parse the descriptor, but using the ioctl is
simpler and supported since Linux v3.10.
My DWM-156 A7 always starts up with the radio off. MBIM radio state support
is necessary to use the modem.
With these two changes , I can successfully establish a connection using the
D-Link DWM-156 A7:
bjorn@nemi:/usr/local/src/git/umbim$ ./umbim -n -d /dev/cdc-wdm2 unlock 1234
Pin Unlocked
bjorn@nemi:/usr/local/src/git/umbim$ ./umbim -n -t 2 -d /dev/cdc-wdm2 radio
hwradiostate: on
swradiostate: off
bjorn@nemi:/usr/local/src/git/umbim$ ./umbim -n -t 2 -d /dev/cdc-wdm2 radio on
hwradiostate: on
swradiostate: on
bjorn@nemi:/usr/local/src/git/umbim$ ./umbim -n -t 2 -d /dev/cdc-wdm2 connect
telenor
sessionid: 0
activationstate: 0001 - activated
voicecallstate: 0000 - none
nwerror: 0000 - unknown
iptype: 0001 - ipv4
bjorn@nemi:/usr/local/src/git/umbim$ ./umbim -n -t 2 -d /dev/cdc-wdm2 config
ipv4address: 109.179.119.106/30
ipv4gateway: 109.179.119.105
ipv4mtu: 1500
ipv4dnsserver: 193.213.112.4
bjorn@nemi:/usr/local/src/git/umbim$ ./umbim -n -t 2 -d /dev/cdc-wdm2 caps
devicetype: 0002 - removable
cellularclass: 0001
voiceclass: 0003 - simultaneous-voice-data
simclass: 0002
dataclass: 001F
smscaps: 0003
controlcaps: 0001
maxsessions: 0002
deviceid: 355619050151297
firmwareinfo: MOLY.WR8.W1231.DC.WG.MP.V3
hardwareinfo: MTK2
Bjørn Mork (4):
dynamically allocate buffer
get buffer size from driver
update usage()
add radio_state set/query support
cli.c | 38 +++++++++++++++++++++++++++++++++++++-
mbim-dev.c | 33 ++++++++++++++++++++++++++++-----
mbim-dev.h | 4 +++-
mbim-msg.c | 14 +++++++++-----
mbim.h | 2 --
5 files changed, 77 insertions(+), 14 deletions(-)
--
2.1.4
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