usb: gadget: f_eem: add configfs support

f_eem learns about our configfs interface so we
can remove in-kernel gadget drivers in future.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 159393d58912..d5b0ffe26118 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -544,6 +544,21 @@ choice
 
 # this first set of drivers all depend on bulk-capable hardware.
 
+config USB_CONFIGFS_EEM
+        bool "Ethernet Emulation Model (EEM)"
+        depends on USB_CONFIGFS
+        depends on NET
+        select USB_U_ETHER
+        select USB_F_EEM
+        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.
+
 config USB_CONFIGFS_PHONET
         boolean "Phonet protocol"
         depends on USB_CONFIGFS