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 * https://web.archive.org/web/20101025091240id_/http://www.tandel.be/downloads/INT51X1_Datasheet.pdf 8 * 9 * Based on the work of Jan 'RedBully' Seiffert 10 */ 11 12 #include <linux/module.h> 13 #include <linux/ctype.h> 14 #include <linux/netdevice.h> 15 #include <linux/etherdevice.h> 16 #include <linux/ethtool.h> 17 #include <linux/slab.h> 18 #include <linux/mii.h> 19 #include <linux/usb.h> 20 #include <linux/usb/usbnet.h> 21 22 #define INT51X1_VENDOR_ID 0x09e1 23 #define INT51X1_PRODUCT_ID 0x5121 24 25 #define INT51X1_HEADER_SIZE 2 /* 2 byte header */ 26 27 static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb) 28 { 29 int len; 30 31 if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) { 32 netdev_err(dev->net, "unexpected tiny rx frame\n"); 33 return 0; 34 } 35 36 len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]); 37 38 skb_trim(skb, len); 39 40 return 1; 41 } 42 43 static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev, 44 struct sk_buff *skb, gfp_t flags) 45 { 46 int pack_len = skb->len; 47 int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE; 48 int headroom = skb_headroom(skb); 49 int tailroom = skb_tailroom(skb); 50 int need_tail = 0; 51 __le16 *len; 52 53 /* if packet and our header is smaller than 64 pad to 64 (+ ZLP) */ 54 if ((pack_with_header_len) < dev->maxpacket) 55 need_tail = dev->maxpacket - pack_with_header_len + 1; 56 /* 57 * usbnet would send a ZLP if packetlength mod urbsize == 0 for us, 58 * but we need to know ourself, because this would add to the length 59 * we send down to the device... 60 */ 61 else if (!(pack_with_header_len % dev->maxpacket)) 62 need_tail = 1; 63 64 if (!skb_cloned(skb) && 65 (headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) { 66 if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) { 67 skb->data = memmove(skb->head + INT51X1_HEADER_SIZE, 68 skb->data, skb->len); 69 skb_set_tail_pointer(skb, skb->len); 70 } 71 } else { 72 struct sk_buff *skb2; 73 74 skb2 = skb_copy_expand(skb, 75 INT51X1_HEADER_SIZE, 76 need_tail, 77 flags); 78 dev_kfree_skb_any(skb); 79 if (!skb2) 80 return NULL; 81 skb = skb2; 82 } 83 84 pack_len += need_tail; 85 pack_len &= 0x07ff; 86 87 len = __skb_push(skb, INT51X1_HEADER_SIZE); 88 *len = cpu_to_le16(pack_len); 89 90 if(need_tail) 91 __skb_put_zero(skb, need_tail); 92 93 return skb; 94 } 95 96 static const struct net_device_ops int51x1_netdev_ops = { 97 .ndo_open = usbnet_open, 98 .ndo_stop = usbnet_stop, 99 .ndo_start_xmit = usbnet_start_xmit, 100 .ndo_tx_timeout = usbnet_tx_timeout, 101 .ndo_change_mtu = usbnet_change_mtu, 102 .ndo_get_stats64 = dev_get_tstats64, 103 .ndo_set_mac_address = eth_mac_addr, 104 .ndo_validate_addr = eth_validate_addr, 105 .ndo_set_rx_mode = usbnet_set_rx_mode, 106 }; 107 108 static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf) 109 { 110 int status = usbnet_get_ethernet_addr(dev, 3); 111 112 if (status) 113 return status; 114 115 dev->net->hard_header_len += INT51X1_HEADER_SIZE; 116 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; 117 dev->net->netdev_ops = &int51x1_netdev_ops; 118 119 return usbnet_get_endpoints(dev, intf); 120 } 121 122 static const struct driver_info int51x1_info = { 123 .description = "Intellon usb powerline adapter", 124 .bind = int51x1_bind, 125 .rx_fixup = int51x1_rx_fixup, 126 .tx_fixup = int51x1_tx_fixup, 127 .set_rx_mode = usbnet_cdc_update_filter, 128 .in = 1, 129 .out = 2, 130 .flags = FLAG_ETHER, 131 }; 132 133 static const struct usb_device_id products[] = { 134 { 135 USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID), 136 .driver_info = (unsigned long) &int51x1_info, 137 }, 138 {}, 139 }; 140 MODULE_DEVICE_TABLE(usb, products); 141 142 static struct usb_driver int51x1_driver = { 143 .name = "int51x1", 144 .id_table = products, 145 .probe = usbnet_probe, 146 .disconnect = usbnet_disconnect, 147 .suspend = usbnet_suspend, 148 .resume = usbnet_resume, 149 .disable_hub_initiated_lpm = 1, 150 }; 151 152 module_usb_driver(int51x1_driver); 153 154 MODULE_AUTHOR("Peter Holik"); 155 MODULE_DESCRIPTION("Intellon usb powerline adapter"); 156 MODULE_LICENSE("GPL"); 157