diff options
| author | Brian Niebuhr <bniebuhr@efjohnson.com> | 2009-08-14 10:04:22 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-23 06:46:35 -0700 |
| commit | 9b39e9ddedeef48569f8aac60a7b4c1fbb127c7d (patch) | |
| tree | d2cc583190e18fa03298e84093c3346e1646007c /drivers/usb/gadget/Kconfig | |
| parent | 877accca79b706afe5d78b9a92cf4f22919fb2b0 (diff) | |
USB: gadget: Add EEM gadget driver
This patch adds a CDC EEM ethernet gadget driver. CDC EEM is a newer
USB ethernet specification that uses a simpler interface than the older
CDC ECM. This makes CDC EEM usable by a wider set of USB hardware.
By default the ethernet gadget will still use CDC ECM/Subset, but kernel
configuration and/or a module parameter will allow alternative use of
the CDC EEM protocol.
Changes since last version:
- Brought in missing RNDIS changes that caused compile error
- Modified 'sentinel CRC' checking to match EEM host driver
Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/Kconfig')
| -rw-r--r-- | drivers/usb/gadget/Kconfig | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig index 3537d915d27..4d8ab470f08 100644 --- 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 |