netdev - Re: [PATCH] net: qmi_wwan: Add USB IDs for MDM6600 modem on Motorola Droid 4

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Date:   Sun, 19 Mar 2017 17:31:12 +0100
From:   Bjørn Mork <bjorn@...k.no>
To:     Tony Lindgren <tony@...mide.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: Re: [PATCH] net: qmi_wwan: Add USB IDs for MDM6600 modem on Motorola Droid 4

Tony Lindgren <tony@...mide.com> writes:

> This gets qmicli working with the MDM6600 modem.
>
> Cc: Bjørn Mork <bjorn@...k.no>
> Reviewed-by: Sebastian Reichel <sre@...nel.org>
> Tested-by: Sebastian Reichel <sre@...nel.org>
> Signed-off-by: Tony Lindgren <tony@...mide.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
> --- a/drivers/net/usb/qmi_wwan.c
> +++ b/drivers/net/usb/qmi_wwan.c
> @@ -580,6 +580,10 @@ static const struct usb_device_id products[] = {
>  		USB_VENDOR_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, USB_CLASS_VENDOR_SPEC, 0x01, 0x69),
>  		.driver_info        = (unsigned long)&qmi_wwan_info,
>  	},
> +	{	/* Motorola Mapphone devices with MDM6600 */
> +		USB_VENDOR_AND_INTERFACE_INFO(0x22b8, USB_CLASS_VENDOR_SPEC, 0xfb, 0xff),

This is a bit unusual, so I'd like to verify that it is correct.  Do you
happen to have a "lsusb -v" or /sys/kernel/debug/usb/devices dump for
this device?  Is this usage of vendor + class consistent with the
Windows driver *.inf data?  Are you sure that the ff/fb/ff class is only
used for QMI functions by this vendor ID? 

The reason I ask is that I'd hate to have reports of other Motorola
devices where ff/fb/ff was used for some other USB function.  Yes, that
would be stupid.  But still... Experience shows that we cannot rule out
stupid when we consider USB descriptors.

Bjørn