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, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/ctype.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/slab.h>
  33 #include <linux/mii.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/usbnet.h>
  36
  37 #define INT51X1_VENDOR_ID       0x09e1
  38 #define INT51X1_PRODUCT_ID      0x5121
  39
  40 #define INT51X1_HEADER_SIZE     2       /* 2 byte header */
  41
  42 #define PACKET_TYPE_PROMISCUOUS         (1 << 0)
  43 #define PACKET_TYPE_ALL_MULTICAST       (1 << 1) /* no filter */
  44 #define PACKET_TYPE_DIRECTED            (1 << 2)
  45 #define PACKET_TYPE_BROADCAST           (1 << 3)
  46 #define PACKET_TYPE_MULTICAST           (1 << 4) /* filtered */
  47
  48 #define SET_ETHERNET_PACKET_FILTER      0x43
  49
  50 static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
  51 {
  52         int len;
  53
  54         if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) {
  55                 netdev_err(dev->net, "unexpected tiny rx frame\n");
  56                 return 0;
  57         }
  58
  59         len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]);
  60
  61         skb_trim(skb, len);
  62
  63         return 1;
  64 }
  65
  66 static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev,
  67                 struct sk_buff *skb, gfp_t flags)
  68 {
  69         int pack_len = skb->len;
  70         int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE;
  71         int headroom = skb_headroom(skb);
  72         int tailroom = skb_tailroom(skb);
  73         int need_tail = 0;
  74         __le16 *len;
  75
  76         /* if packet and our header is smaler than 64 pad to 64 (+ ZLP) */
  77         if ((pack_with_header_len) < dev->maxpacket)
  78                 need_tail = dev->maxpacket - pack_with_header_len + 1;
  79         /*
  80          * usbnet would send a ZLP if packetlength mod urbsize == 0 for us,
  81          * but we need to know ourself, because this would add to the length
  82          * we send down to the device...
  83          */
  84         else if (!(pack_with_header_len % dev->maxpacket))
  85                 need_tail = 1;
  86
  87         if (!skb_cloned(skb) &&
  88                         (headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) {
  89                 if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) {
  90                         skb->data = memmove(skb->head + INT51X1_HEADER_SIZE,
  91                                         skb->data, skb->len);
  92                         skb_set_tail_pointer(skb, skb->len);
  93                 }
  94         } else {
  95                 struct sk_buff *skb2;
  96
  97                 skb2 = skb_copy_expand(skb,
  98                                 INT51X1_HEADER_SIZE,
  99                                 need_tail,
 100                                 flags);
 101                 dev_kfree_skb_any(skb);
 102                 if (!skb2)
 103                         return NULL;
 104                 skb = skb2;
 105         }
 106
 107         pack_len += need_tail;
 108         pack_len &= 0x07ff;
 109
 110         len = (__le16 *) __skb_push(skb, INT51X1_HEADER_SIZE);
 111         *len = cpu_to_le16(pack_len);
 112
 113         if(need_tail)
 114                 memset(__skb_put(skb, need_tail), 0, need_tail);
 115
 116         return skb;
 117 }
 118
 119 static void int51x1_set_multicast(struct net_device *netdev)
 120 {
 121         struct usbnet *dev = netdev_priv(netdev);
 122         u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST;
 123
 124         if (netdev->flags & IFF_PROMISC) {
 125                 /* do not expect to see traffic of other PLCs */
 126                 filter |= PACKET_TYPE_PROMISCUOUS;
 127                 netdev_info(dev->net, "promiscuous mode enabled\n");
 128         } else if (!netdev_mc_empty(netdev) ||
 129                   (netdev->flags & IFF_ALLMULTI)) {
 130                 filter |= PACKET_TYPE_ALL_MULTICAST;
 131                 netdev_dbg(dev->net, "receive all multicast enabled\n");
 132         } else {
 133                 /* ~PROMISCUOUS, ~MULTICAST */
 134                 netdev_dbg(dev->net, "receive own packets only\n");
 135         }
 136
 137         usbnet_write_cmd_async(dev, SET_ETHERNET_PACKET_FILTER,
 138                                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 139                                filter, 0, NULL, 0);
 140 }
 141
 142 static const struct net_device_ops int51x1_netdev_ops = {
 143         .ndo_open               = usbnet_open,
 144         .ndo_stop               = usbnet_stop,
 145         .ndo_start_xmit         = usbnet_start_xmit,
 146         .ndo_tx_timeout         = usbnet_tx_timeout,
 147         .ndo_change_mtu         = usbnet_change_mtu,
 148         .ndo_set_mac_address    = eth_mac_addr,
 149         .ndo_validate_addr      = eth_validate_addr,
 150         .ndo_set_rx_mode        = int51x1_set_multicast,
 151 };
 152
 153 static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf)
 154 {
 155         int status = usbnet_get_ethernet_addr(dev, 3);
 156
 157         if (status)
 158                 return status;
 159
 160         dev->net->hard_header_len += INT51X1_HEADER_SIZE;
 161         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
 162         dev->net->netdev_ops = &int51x1_netdev_ops;
 163
 164         return usbnet_get_endpoints(dev, intf);
 165 }
 166
 167 static const struct driver_info int51x1_info = {
 168         .description = "Intellon usb powerline adapter",
 169         .bind        = int51x1_bind,
 170         .rx_fixup    = int51x1_rx_fixup,
 171         .tx_fixup    = int51x1_tx_fixup,
 172         .in          = 1,
 173         .out         = 2,
 174         .flags       = FLAG_ETHER,
 175 };
 176
 177 static const struct usb_device_id products[] = {
 178         {
 179         USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID),
 180                 .driver_info = (unsigned long) &int51x1_info,
 181         },
 182         {},
 183 };
 184 MODULE_DEVICE_TABLE(usb, products);
 185
 186 static struct usb_driver int51x1_driver = {
 187         .name       = "int51x1",
 188         .id_table   = products,
 189         .probe      = usbnet_probe,
 190         .disconnect = usbnet_disconnect,
 191         .suspend    = usbnet_suspend,
 192         .resume     = usbnet_resume,
 193         .disable_hub_initiated_lpm = 1,
 194 };
 195
 196 module_usb_driver(int51x1_driver);
 197
 198 MODULE_AUTHOR("Peter Holik");
 199 MODULE_DESCRIPTION("Intellon usb powerline adapter");
 200 MODULE_LICENSE("GPL");