tjh.dev
Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * u_ether.h -- interface to USB gadget "ethernet link" utilities
3 *
4 * Copyright (C) 2003-2005,2008 David Brownell
5 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
6 * Copyright (C) 2008 Nokia Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#ifndef __U_ETHER_H
15#define __U_ETHER_H
16
17#include <linux/err.h>
18#include <linux/if_ether.h>
19#include <linux/usb/composite.h>
20#include <linux/usb/cdc.h>
21
22#include "gadget_chips.h"
23
24
25/*
26 * This represents the USB side of an "ethernet" link, managed by a USB
27 * function which provides control and (maybe) framing. Two functions
28 * in different configurations could share the same ethernet link/netdev,
29 * using different host interaction models.
30 *
31 * There is a current limitation that only one instance of this link may
32 * be present in any given configuration. When that's a problem, network
33 * layer facilities can be used to package multiple logical links on this
34 * single "physical" one.
35 */
36struct gether {
37 struct usb_function func;
38
39 /* updated by gether_{connect,disconnect} */
40 struct eth_dev *ioport;
41
42 /* endpoints handle full and/or high speeds */
43 struct usb_ep *in_ep;
44 struct usb_ep *out_ep;
45
46 bool is_zlp_ok;
47
48 u16 cdc_filter;
49
50 /* hooks for added framing, as needed for RNDIS and EEM. */
51 u32 header_len;
52 /* NCM requires fixed size bundles */
53 bool is_fixed;
54 u32 fixed_out_len;
55 u32 fixed_in_len;
56 struct sk_buff *(*wrap)(struct gether *port,
57 struct sk_buff *skb);
58 int (*unwrap)(struct gether *port,
59 struct sk_buff *skb,
60 struct sk_buff_head *list);
61
62 /* called on network open/close */
63 void (*open)(struct gether *);
64 void (*close)(struct gether *);
65};
66
67#define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
68 |USB_CDC_PACKET_TYPE_ALL_MULTICAST \
69 |USB_CDC_PACKET_TYPE_PROMISCUOUS \
70 |USB_CDC_PACKET_TYPE_DIRECTED)
71
72
73/* netdev setup/teardown as directed by the gadget driver */
74int gether_setup(struct usb_gadget *g, u8 ethaddr[ETH_ALEN]);
75void gether_cleanup(void);
76
77/* connect/disconnect is handled by individual functions */
78struct net_device *gether_connect(struct gether *);
79void gether_disconnect(struct gether *);
80
81/* Some controllers can't support CDC Ethernet (ECM) ... */
82static inline bool can_support_ecm(struct usb_gadget *gadget)
83{
84 if (!gadget_supports_altsettings(gadget))
85 return false;
86
87 /* Everything else is *presumably* fine ... but this is a bit
88 * chancy, so be **CERTAIN** there are no hardware issues with
89 * your controller. Add it above if it can't handle CDC.
90 */
91 return true;
92}
93
94/* each configuration may bind one instance of an ethernet link */
95int geth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
96int ecm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
97int ncm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
98int eem_bind_config(struct usb_configuration *c);
99
100#ifdef USB_ETH_RNDIS
101
102int rndis_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
103
104#else
105
106static inline int
107rndis_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
108{
109 return 0;
110}
111
112#endif
113
114#endif /* __U_ETHER_H */