These modems use the Qualcomm MSM Interface (QMI) protocol for
management of their CDC ECM like wwan interface. This driver
is perfect for exporting the protocol to userspace.
The created character device will be indistinguishable from a
common AT command based Device Management interface, so
userspace applications must do some intelligent matching
on the USB device.
Signed-off-by: Bjørn Mork <bjorn@xxxxxxx>
---
Finally, turning it on. There are probably a number of other devices
which could take advantage of this as well, but this is a start
Using it to write QMI in one terminal:
bjorn@nemi:~$ perl -e 'print pack("C*", map { hex } @ARGV)' 1 f 0 0 0 0 0 1 22 0 4 0 1 1 0 1 >/dev/cdc-wdm2
While monitoring the transaction in another terminal:
bjorn@nemi:~$ /usr/local/src/git/modemmanager/decode/qmidevdebug.py /dev/cdc-wdm2
read 16 bytes
QMUX Header:
len: 0x000f
sender: 0x00 (client)
svc: 0x00 (ctl)
cid: 0x00
QMI Header:
Flags: 0x00 (request)
TXN: 0x0001
Cmd: 0x0022 (GET_CLIENT_ID)
Size: 0x0004
TLV: 0x01 (CTL/Get Client ID Request/Type)
Size: 0x0001
Data: 01
read 24 bytes
QMUX Header:
len: 0x0017
sender: 0x80 (service)
svc: 0x00 (ctl)
cid: 0x00
QMI Header:
Flags: 0x02 (response)
TXN: 0x0001
Cmd: 0x0022 (GET_CLIENT_ID)
Size: 0x000c
TLV: 0x02 (CTL/Get Client ID Response/Result Code)
Size: 0x0004
Status: 0 (SUCCESS)
Error: 0
TLV: 0x01 (CTL/Get Client ID Response/ID)
Size: 0x0002
Data: 01 03
Works like at charm!
drivers/usb/class/cdc-wdm.c | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index e0c17ff..4ca3642 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -34,6 +34,8 @@
/* attribute flags for device list */
#define WDM_ATTR_ECHO 0x0001 /* device wants command echo */
+#define HUAWEI_VENDOR_ID 0x12D1
+
static const struct usb_device_id wdm_ids[] = {
{
.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
@@ -41,6 +43,20 @@ static const struct usb_device_id wdm_ids[] = {
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_DMM
},
+ {
+ /*
+ * Huawei E392, E398 and possibly other Qualcomm based modems
+ * embeds the Qualcomm QMI protocol inside CDC on CDC ECM like
+ * control interfaces. Userspace access to this is required
+ * to configure the accompanying data interface
+ */
+ .match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_INT_INFO,
+ .idVendor = HUAWEI_VENDOR_ID,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 9, /* NOTE: This is a CDC ECM control interface! */
+ .driver_info = WDM_ATTR_ECHO,
+ },
{ }
};
--
1.7.8.3
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