USB: gadget: Add EEM gadget driver

[deliverable/linux.git] / drivers / usb / gadget / Kconfig

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 3537d915d2754a7fa0d7c34065fdd5c54639d3a1..4d8ab470f0874bac3fb4aedaa8702bd5b073aafc 100644 (file)
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -628,8 +628,8 @@ config USB_ETH
        tristate "Ethernet Gadget (with CDC Ethernet support)"
        depends on NET
        help
-         This driver implements Ethernet style communication, in either
-         of two ways:
+         This driver implements Ethernet style communication, in one of
+         several ways:
          
           - The "Communication Device Class" (CDC) Ethernet Control Model.
             That protocol is often avoided with pure Ethernet adapters, in
@@ -639,7 +639,11 @@ config USB_ETH
           - On hardware can't implement that protocol, a simple CDC subset
             is used, placing fewer demands on USB.
 
-         RNDIS support is a third option, more demanding than that subset.
+          - CDC Ethernet Emulation Model (EEM) is a newer standard that has
+            a simpler interface that can be used by more USB hardware.
+
+         RNDIS support is an additional option, more demanding than than
+         subset.
 
          Within the USB device, this gadget driver exposes a network device
          "usbX", where X depends on what other networking devices you have.
@@ -672,6 +676,22 @@ config USB_ETH_RNDIS
           XP, you'll need to download drivers from Microsoft's website; a URL
           is given in comments found in that info file.
 
+config USB_ETH_EEM
+       bool "Ethernet Emulation Model (EEM) support"
+       depends on USB_ETH
+       default n
+       help
+         CDC EEM is a newer USB standard that is somewhat simpler than CDC ECM
+         and therefore can be supported by more hardware.  Technically ECM and
+         EEM are designed for different applications.  The ECM model extends
+         the network interface to the target (e.g. a USB cable modem), and the
+         EEM model is for mobile devices to communicate with hosts using
+         ethernet over USB.  For Linux gadgets, however, the interface with
+         the host is the same (a usbX device), so the differences are minimal.
+
+         If you say "y" here, the Ethernet gadget driver will use the EEM
+         protocol rather than ECM.  If unsure, say "n".
+
 config USB_GADGETFS
        tristate "Gadget Filesystem (EXPERIMENTAL)"
        depends on EXPERIMENTAL