LXR linux/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
  50static 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
  66static 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
 119static 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
 142static 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
 153static 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
 167static 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
 177static 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};
 184MODULE_DEVICE_TABLE(usb, products);
 185
 186static 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
 196module_usb_driver(int51x1_driver);
 197
 198MODULE_AUTHOR("Peter Holik");
 199MODULE_DESCRIPTION("Intellon usb powerline adapter");
 200MODULE_LICENSE("GPL");
 201