net: qmi_wwan: add Dell DW5818, DW5819

Dell Wireless 5819/5818 devices are re-branded Sierra Wireless MC74
series modems which will by default boot with vid 0x413c and pid's
0x81cf, 0x81d0, 0x81d1,0x81d2. Along with qcserial, these modems support
qmi_wwan on the usb interface #12.

Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
---
 drivers/net/usb/qmi_wwan.c | 4 ++++
 1 file changed, 4 insertions(+)

Shrirang Bagul <shrirang.bagul@canonical.com> writes:

> Dell Wireless 5819/5818 devices are re-branded Sierra Wireless MC74
> series modems which will by default boot with vid 0x413c and pid's
> 0x81cf, 0x81d0, 0x81d1,0x81d2. Along with qcserial, these modems support
> qmi_wwan on the usb interface #12.

NAK,

Interace #12 is MBIM, as shown by the device descriptors. Please provide
those descriptors and you will see that this interface is clearly a CDC
MBIM class interface.

Yes, I know these modems probe the control protocol so that you can make
QMI work on an MBIM control interface by sending it a QMI request as the
first messsage.  This is still wrong, abusing a quirky firmware
feature.

You need to reconfigure the modem for QMI using the Sierra specific AT
command or QMI request (tunneled in MBIM!) to properly switch it to QMI
mode, which will appear as a vendor specific interface number 8 (and 10
if you enable both QMI functions).





Bjørn

On Mon, 2017-11-20 at 10:41 +0100, Bjørn Mork wrote:
> Shrirang Bagul <shrirang.bagul@canonical.com> writes:
> 
> > Dell Wireless 5819/5818 devices are re-branded Sierra Wireless MC74
> > series modems which will by default boot with vid 0x413c and pid's
> > 0x81cf, 0x81d0, 0x81d1,0x81d2. Along with qcserial, these modems support
> > qmi_wwan on the usb interface #12.
> 
> NAK,
> 
> Interace #12 is MBIM, as shown by the device descriptors. Please provide
> those descriptors and you will see that this interface is clearly a CDC
> MBIM class interface.
> 
> Yes, I know these modems probe the control protocol so that you can make
> QMI work on an MBIM control interface by sending it a QMI request as the
> first messsage.  This is still wrong, abusing a quirky firmware
> feature.
> 
> You need to reconfigure the modem for QMI using the Sierra specific AT
> command or QMI request (tunneled in MBIM!) to properly switch it to QMI
> mode, which will appear as a vendor specific interface number 8 (and 10
> if you enable both QMI functions).
Understood. Needs more work, will resend with fixes.

- Shrirang
> 
> 
> 
> 
> 
> Bjørn

On 11/20/2017 16:27, Shrirang Bagul wrote:
> Dell Wireless 5819/5818 devices are re-branded Sierra Wireless MC74
> series modems which will by default boot with vid 0x413c and pid's
> 0x81cf, 0x81d0, 0x81d1,0x81d2. Along with qcserial, these modems support
> qmi_wwan on the usb interface #12.
> 
> Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
> ---
>   drivers/net/usb/qmi_wwan.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
> index 8d4a6f7cba61..bdf1fae38af2 100644
> --- a/drivers/net/usb/qmi_wwan.c
> +++ b/drivers/net/usb/qmi_wwan.c
> @@ -1234,6 +1234,10 @@ static const struct usb_device_id products[] = {
>   	{QMI_FIXED_INTF(0x413c, 0x81b3, 8)},	/* Dell Wireless 5809e Gobi(TM) 4G LTE Mobile Broadband Card (rev3) */
>   	{QMI_FIXED_INTF(0x413c, 0x81b6, 8)},	/* Dell Wireless 5811e */
>   	{QMI_FIXED_INTF(0x413c, 0x81b6, 10)},	/* Dell Wireless 5811e */
> +	{QMI_FIXED_INTF(0x413c, 0x81cf, 12)},   /* Dell Wireless 5819 */
> +	{QMI_FIXED_INTF(0x413c, 0x81d0, 12)},   /* Dell Wireless 5819 */
> +	{QMI_FIXED_INTF(0x413c, 0x81d1, 12)},   /* Dell Wireless 5818 */
> +	{QMI_FIXED_INTF(0x413c, 0x81d2, 12)},   /* Dell Wireless 5818 */
>   	{QMI_FIXED_INTF(0x03f0, 0x4e1d, 8)},	/* HP lt4111 LTE/EV-DO/HSPA+ Gobi 4G Module */
>   	{QMI_FIXED_INTF(0x22de, 0x9061, 3)},	/* WeTelecom WPD-600N */
>   	{QMI_FIXED_INTF(0x1e0e, 0x9001, 5)},	/* SIMCom 7230E */
> 


NAK

413c:81cf and 413c:81d1 do not have a net interface, they only have a 
single serial interface (QDL) for firmware update.
Please do not add usb id's for which you have not confirmed the 
interface composition.

br
Lars