drivers/net/usb/int51x1.c

   1 /*
   2  * Copyright (c) 2009 Peter Holik
   3  *
   4  * Intellon usb PLC (Powerline Communications) usb net driver
   5  *
   6  * http://www.tandel.be/downloads/INT51X1_Datasheet.pdf
   7  *
   8  * Based on the work of Jan 'RedBully' Seiffert
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or.
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/ctype.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/ethtool.h>
  31 #include <linux/slab.h>
  32 #include <linux/mii.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb/usbnet.h>
  35
  36 #define INT51X1_VENDOR_ID       0x09e1
  37 #define INT51X1_PRODUCT_ID      0x5121
  38
  39 #define INT51X1_HEADER_SIZE     2       /* 2 byte header */
  40
  41 #define PACKET_TYPE_PROMISCUOUS         (1 << 0)
  42 #define PACKET_TYPE_ALL_MULTICAST       (1 << 1) /* no filter */
  43 #define PACKET_TYPE_DIRECTED            (1 << 2)
  44 #define PACKET_TYPE_BROADCAST           (1 << 3)
  45 #define PACKET_TYPE_MULTICAST           (1 << 4) /* filtered */
  46
  47 #define SET_ETHERNET_PACKET_FILTER      0x43
  48
  49 static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
  50 {
  51         int len;
  52
  53         if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) {
  54                 netdev_err(dev->net, "unexpected tiny rx frame\n");
  55                 return 0;
  56         }
  57
  58         len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]);
  59
  60         skb_trim(skb, len);
  61
  62         return 1;
  63 }
  64
  65 static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev,
  66                 struct sk_buff *skb, gfp_t flags)
  67 {
  68         int pack_len = skb->len;
  69         int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE;
  70         int headroom = skb_headroom(skb);
  71         int tailroom = skb_tailroom(skb);
  72         int need_tail = 0;
  73         __le16 *len;
  74
  75         /* if packet and our header is smaler than 64 pad to 64 (+ ZLP) */
  76         if ((pack_with_header_len) < dev->maxpacket)
  77                 need_tail = dev->maxpacket - pack_with_header_len + 1;
  78         /*
  79          * usbnet would send a ZLP if packetlength mod urbsize == 0 for us,
  80          * but we need to know ourself, because this would add to the length
  81          * we send down to the device...
  82          */
  83         else if (!(pack_with_header_len % dev->maxpacket))
  84                 need_tail = 1;
  85
  86         if (!skb_cloned(skb) &&
  87                         (headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) {
  88                 if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) {
  89                         skb->data = memmove(skb->head + INT51X1_HEADER_SIZE,
  90                                         skb->data, skb->len);
  91                         skb_set_tail_pointer(skb, skb->len);
  92                 }
  93         } else {
  94                 struct sk_buff *skb2;
  95
  96                 skb2 = skb_copy_expand(skb,
  97                                 INT51X1_HEADER_SIZE,
  98                                 need_tail,
  99                                 flags);
 100                 dev_kfree_skb_any(skb);
 101                 if (!skb2)
 102                         return NULL;
 103                 skb = skb2;
 104         }
 105
 106         pack_len += need_tail;
 107         pack_len &= 0x07ff;
 108
 109         len = (__le16 *) __skb_push(skb, INT51X1_HEADER_SIZE);
 110         *len = cpu_to_le16(pack_len);
 111
 112         if(need_tail)
 113                 memset(__skb_put(skb, need_tail), 0, need_tail);
 114
 115         return skb;
 116 }
 117
 118 static void int51x1_set_multicast(struct net_device *netdev)
 119 {
 120         struct usbnet *dev = netdev_priv(netdev);
 121         u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST;
 122
 123         if (netdev->flags & IFF_PROMISC) {
 124                 /* do not expect to see traffic of other PLCs */
 125                 filter |= PACKET_TYPE_PROMISCUOUS;
 126                 netdev_info(dev->net, "promiscuous mode enabled\n");
 127         } else if (!netdev_mc_empty(netdev) ||
 128                   (netdev->flags & IFF_ALLMULTI)) {
 129                 filter |= PACKET_TYPE_ALL_MULTICAST;
 130                 netdev_dbg(dev->net, "receive all multicast enabled\n");
 131         } else {
 132                 /* ~PROMISCUOUS, ~MULTICAST */
 133                 netdev_dbg(dev->net, "receive own packets only\n");
 134         }
 135
 136         usbnet_write_cmd_async(dev, SET_ETHERNET_PACKET_FILTER,
 137                                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 138                                filter, 0, NULL, 0);
 139 }
 140
 141 static const struct net_device_ops int51x1_netdev_ops = {
 142         .ndo_open               = usbnet_open,
 143         .ndo_stop               = usbnet_stop,
 144         .ndo_start_xmit         = usbnet_start_xmit,
 145         .ndo_tx_timeout         = usbnet_tx_timeout,
 146         .ndo_change_mtu         = usbnet_change_mtu,
 147         .ndo_set_mac_address    = eth_mac_addr,
 148         .ndo_validate_addr      = eth_validate_addr,
 149         .ndo_set_rx_mode        = int51x1_set_multicast,
 150 };
 151
 152 static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf)
 153 {
 154         int status = usbnet_get_ethernet_addr(dev, 3);
 155
 156         if (status)
 157                 return status;
 158
 159         dev->net->hard_header_len += INT51X1_HEADER_SIZE;
 160         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
 161         dev->net->netdev_ops = &int51x1_netdev_ops;
 162
 163         return usbnet_get_endpoints(dev, intf);
 164 }
 165
 166 static const struct driver_info int51x1_info = {
 167         .description = "Intellon usb powerline adapter",
 168         .bind        = int51x1_bind,
 169         .rx_fixup    = int51x1_rx_fixup,
 170         .tx_fixup    = int51x1_tx_fixup,
 171         .in          = 1,
 172         .out         = 2,
 173         .flags       = FLAG_ETHER,
 174 };
 175
 176 static const struct usb_device_id products[] = {
 177         {
 178         USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID),
 179                 .driver_info = (unsigned long) &int51x1_info,
 180         },
 181         {},
 182 };
 183 MODULE_DEVICE_TABLE(usb, products);
 184
 185 static struct usb_driver int51x1_driver = {
 186         .name       = "int51x1",
 187         .id_table   = products,
 188         .probe      = usbnet_probe,
 189         .disconnect = usbnet_disconnect,
 190         .suspend    = usbnet_suspend,
 191         .resume     = usbnet_resume,
 192         .disable_hub_initiated_lpm = 1,
 193 };
 194
 195 module_usb_driver(int51x1_driver);
 196
 197 MODULE_AUTHOR("Peter Holik");
 198 MODULE_DESCRIPTION("Intellon usb powerline adapter");
 199 MODULE_LICENSE("GPL");