1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2009 Peter Holik 4 * 5 * Intellon usb PLC (Powerline Communications) usb net driver 6 * 7 * http://www.tandel.be/downloads/INT51X1_Datasheet.pdf 8 * 9 * Based on the work of Jan 'RedBully' Seiffert 10 */ 11 12 /* 13 */ 14 15 #include <linux/module.h> 16 #include <linux/ctype.h> 17 #include <linux/netdevice.h> 18 #include <linux/etherdevice.h> 19 #include <linux/ethtool.h> 20 #include <linux/slab.h> 21 #include <linux/mii.h> 22 #include <linux/usb.h> 23 #include <linux/usb/usbnet.h> 24 25 #define INT51X1_VENDOR_ID 0x09e1 26 #define INT51X1_PRODUCT_ID 0x5121 27 28 #define INT51X1_HEADER_SIZE 2 /* 2 byte header */ 29 30 #define PACKET_TYPE_PROMISCUOUS (1 << 0) 31 #define PACKET_TYPE_ALL_MULTICAST (1 << 1) /* no filter */ 32 #define PACKET_TYPE_DIRECTED (1 << 2) 33 #define PACKET_TYPE_BROADCAST (1 << 3) 34 #define PACKET_TYPE_MULTICAST (1 << 4) /* filtered */ 35 36 #define SET_ETHERNET_PACKET_FILTER 0x43 37 38 static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb) 39 { 40 int len; 41 42 if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) { 43 netdev_err(dev->net, "unexpected tiny rx frame\n"); 44 return 0; 45 } 46 47 len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]); 48 49 skb_trim(skb, len); 50 51 return 1; 52 } 53 54 static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev, 55 struct sk_buff *skb, gfp_t flags) 56 { 57 int pack_len = skb->len; 58 int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE; 59 int headroom = skb_headroom(skb); 60 int tailroom = skb_tailroom(skb); 61 int need_tail = 0; 62 __le16 *len; 63 64 /* if packet and our header is smaler than 64 pad to 64 (+ ZLP) */ 65 if ((pack_with_header_len) < dev->maxpacket) 66 need_tail = dev->maxpacket - pack_with_header_len + 1; 67 /* 68 * usbnet would send a ZLP if packetlength mod urbsize == 0 for us, 69 * but we need to know ourself, because this would add to the length 70 * we send down to the device... 71 */ 72 else if (!(pack_with_header_len % dev->maxpacket)) 73 need_tail = 1; 74 75 if (!skb_cloned(skb) && 76 (headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) { 77 if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) { 78 skb->data = memmove(skb->head + INT51X1_HEADER_SIZE, 79 skb->data, skb->len); 80 skb_set_tail_pointer(skb, skb->len); 81 } 82 } else { 83 struct sk_buff *skb2; 84 85 skb2 = skb_copy_expand(skb, 86 INT51X1_HEADER_SIZE, 87 need_tail, 88 flags); 89 dev_kfree_skb_any(skb); 90 if (!skb2) 91 return NULL; 92 skb = skb2; 93 } 94 95 pack_len += need_tail; 96 pack_len &= 0x07ff; 97 98 len = __skb_push(skb, INT51X1_HEADER_SIZE); 99 *len = cpu_to_le16(pack_len); 100 101 if(need_tail) 102 __skb_put_zero(skb, need_tail); 103 104 return skb; 105 } 106 107 static void int51x1_set_multicast(struct net_device *netdev) 108 { 109 struct usbnet *dev = netdev_priv(netdev); 110 u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST; 111 112 if (netdev->flags & IFF_PROMISC) { 113 /* do not expect to see traffic of other PLCs */ 114 filter |= PACKET_TYPE_PROMISCUOUS; 115 netdev_info(dev->net, "promiscuous mode enabled\n"); 116 } else if (!netdev_mc_empty(netdev) || 117 (netdev->flags & IFF_ALLMULTI)) { 118 filter |= PACKET_TYPE_ALL_MULTICAST; 119 netdev_dbg(dev->net, "receive all multicast enabled\n"); 120 } else { 121 /* ~PROMISCUOUS, ~MULTICAST */ 122 netdev_dbg(dev->net, "receive own packets only\n"); 123 } 124 125 usbnet_write_cmd_async(dev, SET_ETHERNET_PACKET_FILTER, 126 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 127 filter, 0, NULL, 0); 128 } 129 130 static const struct net_device_ops int51x1_netdev_ops = { 131 .ndo_open = usbnet_open, 132 .ndo_stop = usbnet_stop, 133 .ndo_start_xmit = usbnet_start_xmit, 134 .ndo_tx_timeout = usbnet_tx_timeout, 135 .ndo_change_mtu = usbnet_change_mtu, 136 .ndo_get_stats64 = dev_get_tstats64, 137 .ndo_set_mac_address = eth_mac_addr, 138 .ndo_validate_addr = eth_validate_addr, 139 .ndo_set_rx_mode = int51x1_set_multicast, 140 }; 141 142 static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf) 143 { 144 int status = usbnet_get_ethernet_addr(dev, 3); 145 146 if (status) 147 return status; 148 149 dev->net->hard_header_len += INT51X1_HEADER_SIZE; 150 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; 151 dev->net->netdev_ops = &int51x1_netdev_ops; 152 153 return usbnet_get_endpoints(dev, intf); 154 } 155 156 static const struct driver_info int51x1_info = { 157 .description = "Intellon usb powerline adapter", 158 .bind = int51x1_bind, 159 .rx_fixup = int51x1_rx_fixup, 160 .tx_fixup = int51x1_tx_fixup, 161 .in = 1, 162 .out = 2, 163 .flags = FLAG_ETHER, 164 }; 165 166 static const struct usb_device_id products[] = { 167 { 168 USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID), 169 .driver_info = (unsigned long) &int51x1_info, 170 }, 171 {}, 172 }; 173 MODULE_DEVICE_TABLE(usb, products); 174 175 static struct usb_driver int51x1_driver = { 176 .name = "int51x1", 177 .id_table = products, 178 .probe = usbnet_probe, 179 .disconnect = usbnet_disconnect, 180 .suspend = usbnet_suspend, 181 .resume = usbnet_resume, 182 .disable_hub_initiated_lpm = 1, 183 }; 184 185 module_usb_driver(int51x1_driver); 186 187 MODULE_AUTHOR("Peter Holik"); 188 MODULE_DESCRIPTION("Intellon usb powerline adapter"); 189 MODULE_LICENSE("GPL"); 190