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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (c) 2009 Peter Holik4 *5 * Intellon usb PLC (Powerline Communications) usb net driver6 *7 * http://www.tandel.be/downloads/INT51X1_Datasheet.pdf8 *9 * Based on the work of Jan 'RedBully' Seiffert10 */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 0x09e126#define INT51X1_PRODUCT_ID 0x512127 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 0x4337 38static 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 54static 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 smaller 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 length70 * 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 107static 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 130static 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 142static 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 156static 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 166static 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};173MODULE_DEVICE_TABLE(usb, products);174 175static 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 185module_usb_driver(int51x1_driver);186 187MODULE_AUTHOR("Peter Holik");188MODULE_DESCRIPTION("Intellon usb powerline adapter");189MODULE_LICENSE("GPL");190