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_async_cmd_callback(struct urb *urb) 120 { 121 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 122 int status = urb->status; 123 124 if (status < 0) 125 dev_warn(&urb->dev->dev, "async callback failed with %d\n", status); 126 127 kfree(req); 128 usb_free_urb(urb); 129 } 130 131 static void int51x1_set_multicast(struct net_device *netdev) 132 { 133 struct usb_ctrlrequest *req; 134 int status; 135 struct urb *urb; 136 struct usbnet *dev = netdev_priv(netdev); 137 u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST; 138 139 if (netdev->flags & IFF_PROMISC) { 140 /* do not expect to see traffic of other PLCs */ 141 filter |= PACKET_TYPE_PROMISCUOUS; 142 netdev_info(dev->net, "promiscuous mode enabled\n"); 143 } else if (!netdev_mc_empty(netdev) || 144 (netdev->flags & IFF_ALLMULTI)) { 145 filter |= PACKET_TYPE_ALL_MULTICAST; 146 netdev_dbg(dev->net, "receive all multicast enabled\n"); 147 } else { 148 /* ~PROMISCUOUS, ~MULTICAST */ 149 netdev_dbg(dev->net, "receive own packets only\n"); 150 } 151 152 urb = usb_alloc_urb(0, GFP_ATOMIC); 153 if (!urb) { 154 netdev_warn(dev->net, "Error allocating URB\n"); 155 return; 156 } 157 158 req = kmalloc(sizeof(*req), GFP_ATOMIC); 159 if (!req) { 160 netdev_warn(dev->net, "Error allocating control msg\n"); 161 goto out; 162 } 163 164 req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE; 165 req->bRequest = SET_ETHERNET_PACKET_FILTER; 166 req->wValue = cpu_to_le16(filter); 167 req->wIndex = 0; 168 req->wLength = 0; 169 170 usb_fill_control_urb(urb, dev->udev, usb_sndctrlpipe(dev->udev, 0), 171 (void *)req, NULL, 0, 172 int51x1_async_cmd_callback, 173 (void *)req); 174 175 status = usb_submit_urb(urb, GFP_ATOMIC); 176 if (status < 0) { 177 netdev_warn(dev->net, "Error submitting control msg, sts=%d\n", 178 status); 179 goto out1; 180 } 181 return; 182 out1: 183 kfree(req); 184 out: 185 usb_free_urb(urb); 186 } 187 188 static const struct net_device_ops int51x1_netdev_ops = { 189 .ndo_open = usbnet_open, 190 .ndo_stop = usbnet_stop, 191 .ndo_start_xmit = usbnet_start_xmit, 192 .ndo_tx_timeout = usbnet_tx_timeout, 193 .ndo_change_mtu = usbnet_change_mtu, 194 .ndo_set_mac_address = eth_mac_addr, 195 .ndo_validate_addr = eth_validate_addr, 196 .ndo_set_rx_mode = int51x1_set_multicast, 197 }; 198 199 static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf) 200 { 201 int status = usbnet_get_ethernet_addr(dev, 3); 202 203 if (status) 204 return status; 205 206 dev->net->hard_header_len += INT51X1_HEADER_SIZE; 207 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; 208 dev->net->netdev_ops = &int51x1_netdev_ops; 209 210 return usbnet_get_endpoints(dev, intf); 211 } 212 213 static const struct driver_info int51x1_info = { 214 .description = "Intellon usb powerline adapter", 215 .bind = int51x1_bind, 216 .rx_fixup = int51x1_rx_fixup, 217 .tx_fixup = int51x1_tx_fixup, 218 .in = 1, 219 .out = 2, 220 .flags = FLAG_ETHER, 221 }; 222 223 static const struct usb_device_id products[] = { 224 { 225 USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID), 226 .driver_info = (unsigned long) &int51x1_info, 227 }, 228 {}, 229 }; 230 MODULE_DEVICE_TABLE(usb, products); 231 232 static struct usb_driver int51x1_driver = { 233 .name = "int51x1", 234 .id_table = products, 235 .probe = usbnet_probe, 236 .disconnect = usbnet_disconnect, 237 .suspend = usbnet_suspend, 238 .resume = usbnet_resume, 239 .disable_hub_initiated_lpm = 1, 240 }; 241 242 module_usb_driver(int51x1_driver); 243 244 MODULE_AUTHOR("Peter Holik"); 245 MODULE_DESCRIPTION("Intellon usb powerline adapter"); 246 MODULE_LICENSE("GPL"); 247