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* u_ether.h -- interface to USB gadget "ethernet link" utilities
* Copyright (C) 2003-2005,2008 David Brownell
* Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
* Copyright (C) 2008 Nokia Corporation
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef __U_ETHER_H
#define __U_ETHER_H
#include <linux/err.h>
#include <linux/if_ether.h>
#include <linux/usb/composite.h>
#include <linux/usb/cdc.h>
#include "gadget_chips.h"
* This represents the USB side of an "ethernet" link, managed by a USB
* function which provides control and (maybe) framing. Two functions
* in different configurations could share the same ethernet link/netdev,
* using different host interaction models.
* There is a current limitation that only one instance of this link may
* be present in any given configuration. When that's a problem, network
* layer facilities can be used to package multiple logical links on this
* single "physical" one.
struct gether {
struct usb_function func;
/* updated by gether_{connect,disconnect} */
struct eth_dev *ioport;
/* endpoints handle full and/or high speeds */
struct usb_ep *in_ep;
struct usb_ep *out_ep;
/* descriptors match device speed at gether_connect() time */
struct usb_endpoint_descriptor *in;
struct usb_endpoint_descriptor *out;
bool is_zlp_ok;
u16 cdc_filter;
/* hooks for added framing, as needed for RNDIS and EEM. */
u32 header_len;
struct sk_buff *(*wrap)(struct gether *port,
struct sk_buff *skb);
int (*unwrap)(struct gether *port,
struct sk_buff *skb,
struct sk_buff_head *list);
/* called on network open/close */
void (*open)(struct gether *);
void (*close)(struct gether *);
/* netdev setup/teardown as directed by the gadget driver */
int gether_setup(struct usb_gadget *g, u8 ethaddr[ETH_ALEN]);
void gether_cleanup(void);
/* connect/disconnect is handled by individual functions */
struct net_device *gether_connect(struct gether *);
void gether_disconnect(struct gether *);
/* Some controllers can't support CDC Ethernet (ECM) ... */
static inline bool can_support_ecm(struct usb_gadget *gadget)
if (!gadget_supports_altsettings(gadget))
return false;
/* Everything else is *presumably* fine ... but this is a bit
* chancy, so be **CERTAIN** there are no hardware issues with
* your controller. Add it above if it can't handle CDC.
return true;
/* each configuration may bind one instance of an ethernet link */
int geth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
int ecm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
int eem_bind_config(struct usb_configuration *c);
int rndis_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
static inline int
rndis_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
return 0;
#endif /* __U_ETHER_H */