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Linux/drivers/net/usb/int51x1.c

  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, see <http://www.gnu.org/licenses/>.
 24  */
 25 
 26 #include <linux/module.h>
 27 #include <linux/ctype.h>
 28 #include <linux/netdevice.h>
 29 #include <linux/etherdevice.h>
 30 #include <linux/ethtool.h>
 31 #include <linux/slab.h>
 32 #include <linux/mii.h>
 33 #include <linux/usb.h>
 34 #include <linux/usb/usbnet.h>
 35 
 36 #define INT51X1_VENDOR_ID       0x09e1
 37 #define INT51X1_PRODUCT_ID      0x5121
 38 
 39 #define INT51X1_HEADER_SIZE     2       /* 2 byte header */
 40 
 41 #define PACKET_TYPE_PROMISCUOUS         (1 << 0)
 42 #define PACKET_TYPE_ALL_MULTICAST       (1 << 1) /* no filter */
 43 #define PACKET_TYPE_DIRECTED            (1 << 2)
 44 #define PACKET_TYPE_BROADCAST           (1 << 3)
 45 #define PACKET_TYPE_MULTICAST           (1 << 4) /* filtered */
 46 
 47 #define SET_ETHERNET_PACKET_FILTER      0x43
 48 
 49 static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 50 {
 51         int len;
 52 
 53         if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) {
 54                 netdev_err(dev->net, "unexpected tiny rx frame\n");
 55                 return 0;
 56         }
 57 
 58         len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]);
 59 
 60         skb_trim(skb, len);
 61 
 62         return 1;
 63 }
 64 
 65 static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev,
 66                 struct sk_buff *skb, gfp_t flags)
 67 {
 68         int pack_len = skb->len;
 69         int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE;
 70         int headroom = skb_headroom(skb);
 71         int tailroom = skb_tailroom(skb);
 72         int need_tail = 0;
 73         __le16 *len;
 74 
 75         /* if packet and our header is smaler than 64 pad to 64 (+ ZLP) */
 76         if ((pack_with_header_len) < dev->maxpacket)
 77                 need_tail = dev->maxpacket - pack_with_header_len + 1;
 78         /*
 79          * usbnet would send a ZLP if packetlength mod urbsize == 0 for us,
 80          * but we need to know ourself, because this would add to the length
 81          * we send down to the device...
 82          */
 83         else if (!(pack_with_header_len % dev->maxpacket))
 84                 need_tail = 1;
 85 
 86         if (!skb_cloned(skb) &&
 87                         (headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) {
 88                 if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) {
 89                         skb->data = memmove(skb->head + INT51X1_HEADER_SIZE,
 90                                         skb->data, skb->len);
 91                         skb_set_tail_pointer(skb, skb->len);
 92                 }
 93         } else {
 94                 struct sk_buff *skb2;
 95 
 96                 skb2 = skb_copy_expand(skb,
 97                                 INT51X1_HEADER_SIZE,
 98                                 need_tail,
 99                                 flags);
100                 dev_kfree_skb_any(skb);
101                 if (!skb2)
102                         return NULL;
103                 skb = skb2;
104         }
105 
106         pack_len += need_tail;
107         pack_len &= 0x07ff;
108 
109         len = (__le16 *) __skb_push(skb, INT51X1_HEADER_SIZE);
110         *len = cpu_to_le16(pack_len);
111 
112         if(need_tail)
113                 memset(__skb_put(skb, need_tail), 0, need_tail);
114 
115         return skb;
116 }
117 
118 static void int51x1_set_multicast(struct net_device *netdev)
119 {
120         struct usbnet *dev = netdev_priv(netdev);
121         u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST;
122 
123         if (netdev->flags & IFF_PROMISC) {
124                 /* do not expect to see traffic of other PLCs */
125                 filter |= PACKET_TYPE_PROMISCUOUS;
126                 netdev_info(dev->net, "promiscuous mode enabled\n");
127         } else if (!netdev_mc_empty(netdev) ||
128                   (netdev->flags & IFF_ALLMULTI)) {
129                 filter |= PACKET_TYPE_ALL_MULTICAST;
130                 netdev_dbg(dev->net, "receive all multicast enabled\n");
131         } else {
132                 /* ~PROMISCUOUS, ~MULTICAST */
133                 netdev_dbg(dev->net, "receive own packets only\n");
134         }
135 
136         usbnet_write_cmd_async(dev, SET_ETHERNET_PACKET_FILTER,
137                                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
138                                filter, 0, NULL, 0);
139 }
140 
141 static const struct net_device_ops int51x1_netdev_ops = {
142         .ndo_open               = usbnet_open,
143         .ndo_stop               = usbnet_stop,
144         .ndo_start_xmit         = usbnet_start_xmit,
145         .ndo_tx_timeout         = usbnet_tx_timeout,
146         .ndo_change_mtu         = usbnet_change_mtu,
147         .ndo_set_mac_address    = eth_mac_addr,
148         .ndo_validate_addr      = eth_validate_addr,
149         .ndo_set_rx_mode        = int51x1_set_multicast,
150 };
151 
152 static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf)
153 {
154         int status = usbnet_get_ethernet_addr(dev, 3);
155 
156         if (status)
157                 return status;
158 
159         dev->net->hard_header_len += INT51X1_HEADER_SIZE;
160         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
161         dev->net->netdev_ops = &int51x1_netdev_ops;
162 
163         return usbnet_get_endpoints(dev, intf);
164 }
165 
166 static const struct driver_info int51x1_info = {
167         .description = "Intellon usb powerline adapter",
168         .bind        = int51x1_bind,
169         .rx_fixup    = int51x1_rx_fixup,
170         .tx_fixup    = int51x1_tx_fixup,
171         .in          = 1,
172         .out         = 2,
173         .flags       = FLAG_ETHER,
174 };
175 
176 static const struct usb_device_id products[] = {
177         {
178         USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID),
179                 .driver_info = (unsigned long) &int51x1_info,
180         },
181         {},
182 };
183 MODULE_DEVICE_TABLE(usb, products);
184 
185 static struct usb_driver int51x1_driver = {
186         .name       = "int51x1",
187         .id_table   = products,
188         .probe      = usbnet_probe,
189         .disconnect = usbnet_disconnect,
190         .suspend    = usbnet_suspend,
191         .resume     = usbnet_resume,
192         .disable_hub_initiated_lpm = 1,
193 };
194 
195 module_usb_driver(int51x1_driver);
196 
197 MODULE_AUTHOR("Peter Holik");
198 MODULE_DESCRIPTION("Intellon usb powerline adapter");
199 MODULE_LICENSE("GPL");
200 

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