Re: [PATCH] usb: gadget: f_rndis: fix usb_interface_descriptor for rndis
From: Lars Melin
Date: Wed Sep 24 2014 - 10:22:33 EST
On 2014-09-24 20:12, Heiko Schocher wrote:
Am 24.09.2014 14:25, schrieb Lars Melin:
On 2014-09-24 13:48, Heiko Schocher wrote:
use the values for RNDIS over Ethernet as defined inThat is usb class, it is not the same thing as communication device
(search for RDNIS):
- baseclass: 0xef (miscellaneous)
- subclass: 0x04
- protocol: 0x01
No, no, no.
@@ -12,6 +12,7 @@
#define USB_CDC_SUBCLASS_ACM 0x02
+#define USB_CDC_SUBCLASS_RNDIS 0x04
There is no CDC_SUBCLASS_RNDIS and you can not define one over an
already used cdc subclass number, 0x04 is Multi-Channel Control Model
Ah, ok, so I have to define this values in a new header file, as there
is no current file for the USB_CLASS_MISC defines? Or is there a proper
place for them?
BTW: where do I find the "cdc subclass number, 0x04 is Multi-Channel
Control Model" define?
You can still find the original specification usbcdc11.pdf on the net if
you google for it, it has been pulled from usb.org where you could
download it until a few years ago.
It is old but covers a lot of what you need to know.
Linux has afaik only the cdc.h definition file, everything else is coded
by class/subclass in respectively drivers when needed.
02/02/ff or e0/01/03 are the most common interface attribute for
rndis, both of them together with a data interface with attributes
Please check the whitelisting in drivers/net/usb/rndis_host.c and also
blacklistings in other net drivers under the same path, it should give
you an idea how to bind an interface to a specific driver by interface
attributes and/or usb vid:pid.
You should be able to do the same for your particular device.
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