include/linux/usb/usbnet.h

   1 /*
   2  * USB Networking Link Interface
   3  *
   4  * Copyright (C) 2000-2005 by David Brownell <dbrownell@users.sourceforge.net>
   5  * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22
  23 #ifndef __USBNET_H
  24 #define __USBNET_H
  25
  26
  27 /* interface from usbnet core to each USB networking link we handle */
  28 struct usbnet {
  29         /* housekeeping */
  30         struct usb_device       *udev;
  31         struct usb_interface    *intf;
  32         struct driver_info      *driver_info;
  33         const char              *driver_name;
  34         void                    *driver_priv;
  35         wait_queue_head_t       *wait;
  36         struct mutex            phy_mutex;
  37         unsigned char           suspend_count;
  38
  39         /* i/o info: pipes etc */
  40         unsigned                in, out;
  41         struct usb_host_endpoint *status;
  42         unsigned                maxpacket;
  43         struct timer_list       delay;
  44
  45         /* protocol/interface state */
  46         struct net_device       *net;
  47         struct net_device_stats stats;
  48         int                     msg_enable;
  49         unsigned long           data [5];
  50         u32                     xid;
  51         u32                     hard_mtu;       /* count any extra framing */
  52         size_t                  rx_urb_size;    /* size for rx urbs */
  53         struct mii_if_info      mii;
  54
  55         /* various kinds of pending driver work */
  56         struct sk_buff_head     rxq;
  57         struct sk_buff_head     txq;
  58         struct sk_buff_head     done;
  59         struct urb              *interrupt;
  60         struct tasklet_struct   bh;
  61
  62         struct work_struct      kevent;
  63         unsigned long           flags;
  64 #               define EVENT_TX_HALT    0
  65 #               define EVENT_RX_HALT    1
  66 #               define EVENT_RX_MEMORY  2
  67 #               define EVENT_STS_SPLIT  3
  68 #               define EVENT_LINK_RESET 4
  69 };
  70
  71 static inline struct usb_driver *driver_of(struct usb_interface *intf)
  72 {
  73         return to_usb_driver(intf->dev.driver);
  74 }
  75
  76 /* interface from the device/framing level "minidriver" to core */
  77 struct driver_info {
  78         char            *description;
  79
  80         int             flags;
  81 /* framing is CDC Ethernet, not writing ZLPs (hw issues), or optionally: */
  82 #define FLAG_FRAMING_NC 0x0001          /* guard against device dropouts */
  83 #define FLAG_FRAMING_GL 0x0002          /* genelink batches packets */
  84 #define FLAG_FRAMING_Z  0x0004          /* zaurus adds a trailer */
  85 #define FLAG_FRAMING_RN 0x0008          /* RNDIS batches, plus huge header */
  86
  87 #define FLAG_NO_SETINT  0x0010          /* device can't set_interface() */
  88 #define FLAG_ETHER      0x0020          /* maybe use "eth%d" names */
  89
  90 #define FLAG_FRAMING_AX 0x0040          /* AX88772/178 packets */
  91 #define FLAG_WLAN       0x0080          /* use "wlan%d" names */
  92
  93
  94         /* init device ... can sleep, or cause probe() failure */
  95         int     (*bind)(struct usbnet *, struct usb_interface *);
  96
  97         /* cleanup device ... can sleep, but can't fail */
  98         void    (*unbind)(struct usbnet *, struct usb_interface *);
  99
 100         /* reset device ... can sleep */
 101         int     (*reset)(struct usbnet *);
 102
 103         /* see if peer is connected ... can sleep */
 104         int     (*check_connect)(struct usbnet *);
 105
 106         /* for status polling */
 107         void    (*status)(struct usbnet *, struct urb *);
 108
 109         /* link reset handling, called from defer_kevent */
 110         int     (*link_reset)(struct usbnet *);
 111
 112         /* fixup rx packet (strip framing) */
 113         int     (*rx_fixup)(struct usbnet *dev, struct sk_buff *skb);
 114
 115         /* fixup tx packet (add framing) */
 116         struct sk_buff  *(*tx_fixup)(struct usbnet *dev,
 117                                 struct sk_buff *skb, gfp_t flags);
 118
 119         /* early initialization code, can sleep. This is for minidrivers
 120          * having 'subminidrivers' that need to do extra initialization
 121          * right after minidriver have initialized hardware. */
 122         int     (*early_init)(struct usbnet *dev);
 123
 124         /* called by minidriver when link state changes, state: 0=disconnect,
 125          * 1=connect */
 126         void    (*link_change)(struct usbnet *dev, int state);
 127
 128         /* for new devices, use the descriptor-reading code instead */
 129         int             in;             /* rx endpoint */
 130         int             out;            /* tx endpoint */
 131
 132         unsigned long   data;           /* Misc driver specific data */
 133 };
 134
 135 /* Minidrivers are just drivers using the "usbnet" core as a powerful
 136  * network-specific subroutine library ... that happens to do pretty
 137  * much everything except custom framing and chip-specific stuff.
 138  */
 139 extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
 140 extern int usbnet_suspend (struct usb_interface *, pm_message_t );
 141 extern int usbnet_resume (struct usb_interface *);
 142 extern void usbnet_disconnect(struct usb_interface *);
 143
 144
 145 /* Drivers that reuse some of the standard USB CDC infrastructure
 146  * (notably, using multiple interfaces according to the CDC
 147  * union descriptor) get some helper code.
 148  */
 149 struct cdc_state {
 150         struct usb_cdc_header_desc      *header;
 151         struct usb_cdc_union_desc       *u;
 152         struct usb_cdc_ether_desc       *ether;
 153         struct usb_interface            *control;
 154         struct usb_interface            *data;
 155 };
 156
 157 extern int usbnet_generic_cdc_bind (struct usbnet *, struct usb_interface *);
 158 extern void usbnet_cdc_unbind (struct usbnet *, struct usb_interface *);
 159
 160 /* CDC and RNDIS support the same host-chosen packet filters for IN transfers */
 161 #define DEFAULT_FILTER  (USB_CDC_PACKET_TYPE_BROADCAST \
 162                         |USB_CDC_PACKET_TYPE_ALL_MULTICAST \
 163                         |USB_CDC_PACKET_TYPE_PROMISCUOUS \
 164                         |USB_CDC_PACKET_TYPE_DIRECTED)
 165
 166
 167 /* we record the state for each of our queued skbs */
 168 enum skb_state {
 169         illegal = 0,
 170         tx_start, tx_done,
 171         rx_start, rx_done, rx_cleanup
 172 };
 173
 174 struct skb_data {       /* skb->cb is one of these */
 175         struct urb              *urb;
 176         struct usbnet           *dev;
 177         enum skb_state          state;
 178         size_t                  length;
 179 };
 180
 181
 182 extern int usbnet_get_endpoints(struct usbnet *, struct usb_interface *);
 183 extern void usbnet_defer_kevent (struct usbnet *, int);
 184 extern void usbnet_skb_return (struct usbnet *, struct sk_buff *);
 185 extern void usbnet_unlink_rx_urbs(struct usbnet *);
 186
 187 extern int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd);
 188 extern int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd);
 189 extern u32 usbnet_get_link (struct net_device *net);
 190 extern u32 usbnet_get_msglevel (struct net_device *);
 191 extern void usbnet_set_msglevel (struct net_device *, u32);
 192 extern void usbnet_get_drvinfo (struct net_device *, struct ethtool_drvinfo *);
 193 extern int usbnet_nway_reset(struct net_device *net);
 194
 195 /* messaging support includes the interface name, so it must not be
 196  * used before it has one ... notably, in minidriver bind() calls.
 197  */
 198 #ifdef DEBUG
 199 #define devdbg(usbnet, fmt, arg...) \
 200         printk(KERN_DEBUG "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
 201 #else
 202 #define devdbg(usbnet, fmt, arg...) do {} while(0)
 203 #endif
 204
 205 #define deverr(usbnet, fmt, arg...) \
 206         printk(KERN_ERR "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
 207 #define devwarn(usbnet, fmt, arg...) \
 208         printk(KERN_WARNING "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
 209
 210 #define devinfo(usbnet, fmt, arg...) \
 211         printk(KERN_INFO "%s: " fmt "\n" , (usbnet)->net->name , ## arg); \
 212
 213
 214 #endif  /* __USBNET_H */