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"); 200