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 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #ifndef __U_ETHER_H
24 #define __U_ETHER_H
25
26 #include <linux/err.h>
27 #include <linux/if_ether.h>
28 #include <linux/usb/composite.h>
29 #include <linux/usb/cdc.h>
30
31 #include "gadget_chips.h"
32
33
34 /*
35 * This represents the USB side of an "ethernet" link, managed by a USB
36 * function which provides control and (maybe) framing. Two functions
37 * in different configurations could share the same ethernet link/netdev,
38 * using different host interaction models.
39 *
40 * There is a current limitation that only one instance of this link may
41 * be present in any given configuration. When that's a problem, network
42 * layer facilities can be used to package multiple logical links on this
43 * single "physical" one.
44 */
45 struct gether {
46 struct usb_function func;
47
48 /* updated by gether_{connect,disconnect} */
49 struct eth_dev *ioport;
50
51 /* endpoints handle full and/or high speeds */
52 struct usb_ep *in_ep;
53 struct usb_ep *out_ep;
54
55 /* descriptors match device speed at gether_connect() time */
56 struct usb_endpoint_descriptor *in;
57 struct usb_endpoint_descriptor *out;
58
59 bool is_zlp_ok;
60
61 u16 cdc_filter;
62
63 /* hooks for added framing, as needed for RNDIS and EEM.
64 * we currently don't support multiple frames per SKB.
65 */
66 u32 header_len;
67 struct sk_buff *(*wrap)(struct sk_buff *skb);
68 int (*unwrap)(struct sk_buff *skb);
69
70 /* called on network open/close */
71 void (*open)(struct gether *);
72 void (*close)(struct gether *);
73 };
74
75 #define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
76 |USB_CDC_PACKET_TYPE_ALL_MULTICAST \
77 |USB_CDC_PACKET_TYPE_PROMISCUOUS \
78 |USB_CDC_PACKET_TYPE_DIRECTED)
79
80
81 /* netdev setup/teardown as directed by the gadget driver */
82 int gether_setup(struct usb_gadget *g, u8 ethaddr[ETH_ALEN]);
83 void gether_cleanup(void);
84
85 /* connect/disconnect is handled by individual functions */
86 struct net_device *gether_connect(struct gether *);
87 void gether_disconnect(struct gether *);
88
89 /* Some controllers can't support CDC Ethernet (ECM) ... */
90 static inline bool can_support_ecm(struct usb_gadget *gadget)
91 {
92 if (!gadget_supports_altsettings(gadget))
93 return false;
94
95 /* SA1100 can do ECM, *without* status endpoint ... but we'll
96 * only use it in non-ECM mode for backwards compatibility
97 * (and since we currently require a status endpoint)
98 */
99 if (gadget_is_sa1100(gadget))
100 return false;
101
102 /* Everything else is *presumably* fine ... but this is a bit
103 * chancy, so be **CERTAIN** there are no hardware issues with
104 * your controller. Add it above if it can't handle CDC.
105 */
106 return true;
107 }
108
109 /* each configuration may bind one instance of an ethernet link */
110 int geth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
111 int ecm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
112
113 #ifdef CONFIG_USB_ETH_RNDIS
114
115 int rndis_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
116
117 #else
118
119 static inline int
120 rndis_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
121 {
122 return 0;
123 }
124
125 #endif
126
127 #endif /* __U_ETHER_H */
128
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