// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) 2009 Peter Holik * * Intellon usb PLC (Powerline Communications) usb net driver * * http://www.tandel.be/downloads/INT51X1_Datasheet.pdf * * Based on the work of Jan 'RedBully' Seiffert */ /* */ #include <linux/module.h> #include <linux/ctype.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/slab.h> #include <linux/mii.h> #include <linux/usb.h> #include <linux/usb/usbnet.h> #define INT51X1_VENDOR_ID 0x09e1 #define INT51X1_PRODUCT_ID 0x5121 #define INT51X1_HEADER_SIZE 2 /* 2 byte header */ #define PACKET_TYPE_PROMISCUOUS (1 << 0) #define PACKET_TYPE_ALL_MULTICAST (1 << 1) /* no filter */ #define PACKET_TYPE_DIRECTED (1 << 2) #define PACKET_TYPE_BROADCAST (1 << 3) #define PACKET_TYPE_MULTICAST (1 << 4) /* filtered */ #define SET_ETHERNET_PACKET_FILTER 0x43 static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb) { int len; if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) { netdev_err(dev->net, "unexpected tiny rx frame\n"); return 0; } len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]); skb_trim(skb, len); return 1; } static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) { int pack_len = skb->len; int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE; int headroom = skb_headroom(skb); int tailroom = skb_tailroom(skb); int need_tail = 0; __le16 *len; /* if packet and our header is smaller than 64 pad to 64 (+ ZLP) */ if ((pack_with_header_len) < dev->maxpacket) need_tail = dev->maxpacket - pack_with_header_len + 1; /* * usbnet would send a ZLP if packetlength mod urbsize == 0 for us, * but we need to know ourself, because this would add to the length * we send down to the device... */ else if (!(pack_with_header_len % dev->maxpacket)) need_tail = 1; if (!skb_cloned(skb) && (headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) { if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) { skb->data = memmove(skb->head + INT51X1_HEADER_SIZE, skb->data, skb->len); skb_set_tail_pointer(skb, skb->len); } } else { struct sk_buff *skb2; skb2 = skb_copy_expand(skb, INT51X1_HEADER_SIZE, need_tail, flags); dev_kfree_skb_any(skb); if (!skb2) return NULL; skb = skb2; } pack_len += need_tail; pack_len &= 0x07ff; len = __skb_push(skb, INT51X1_HEADER_SIZE); *len = cpu_to_le16(pack_len); if(need_tail) __skb_put_zero(skb, need_tail); return skb; } static void int51x1_set_multicast(struct net_device *netdev) { struct usbnet *dev = netdev_priv(netdev); u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST; if (netdev->flags & IFF_PROMISC) { /* do not expect to see traffic of other PLCs */ filter |= PACKET_TYPE_PROMISCUOUS; netdev_info(dev->net, "promiscuous mode enabled\n"); } else if (!netdev_mc_empty(netdev) || (netdev->flags & IFF_ALLMULTI)) { filter |= PACKET_TYPE_ALL_MULTICAST; netdev_dbg(dev->net, "receive all multicast enabled\n"); } else { /* ~PROMISCUOUS, ~MULTICAST */ netdev_dbg(dev->net, "receive own packets only\n"); } usbnet_write_cmd_async(dev, SET_ETHERNET_PACKET_FILTER, USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, filter, 0, NULL, 0); } static const struct net_device_ops int51x1_netdev_ops = { .ndo_open = usbnet_open, .ndo_stop = usbnet_stop, .ndo_start_xmit = usbnet_start_xmit, .ndo_tx_timeout = usbnet_tx_timeout, .ndo_change_mtu = usbnet_change_mtu, .ndo_get_stats64 = dev_get_tstats64, .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, .ndo_set_rx_mode = int51x1_set_multicast, }; static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf) { int status = usbnet_get_ethernet_addr(dev, 3); if (status) return status; dev->net->hard_header_len += INT51X1_HEADER_SIZE; dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; dev->net->netdev_ops = &int51x1_netdev_ops; return usbnet_get_endpoints(dev, intf); } static const struct driver_info int51x1_info = { .description = "Intellon usb powerline adapter", .bind = int51x1_bind, .rx_fixup = int51x1_rx_fixup, .tx_fixup = int51x1_tx_fixup, .in = 1, .out = 2, .flags = FLAG_ETHER, }; static const struct usb_device_id products[] = { { USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID), .driver_info = (unsigned long) &int51x1_info, }, {}, }; MODULE_DEVICE_TABLE(usb, products); static struct usb_driver int51x1_driver = { .name = "int51x1", .id_table = products, .probe = usbnet_probe, .disconnect = usbnet_disconnect, .suspend = usbnet_suspend, .resume = usbnet_resume, .disable_hub_initiated_lpm = 1, }; module_usb_driver(int51x1_driver); MODULE_AUTHOR("Peter Holik"); MODULE_DESCRIPTION("Intellon usb powerline adapter"); MODULE_LICENSE("GPL");