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, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
27 #include <linux/module.h>
28 #include <linux/ctype.h>
29 #include <linux/netdevice.h>
30 #include <linux/etherdevice.h>
31 #include <linux/ethtool.h>
32 #include <linux/slab.h>
33 #include <linux/mii.h>
34 #include <linux/usb.h>
35 #include <linux/usb/usbnet.h>
36
37 #define INT51X1_VENDOR_ID 0x09e1
38 #define INT51X1_PRODUCT_ID 0x5121
39
40 #define INT51X1_HEADER_SIZE 2 /* 2 byte header */
41
42 #define PACKET_TYPE_PROMISCUOUS (1 << 0)
43 #define PACKET_TYPE_ALL_MULTICAST (1 << 1) /* no filter */
44 #define PACKET_TYPE_DIRECTED (1 << 2)
45 #define PACKET_TYPE_BROADCAST (1 << 3)
46 #define PACKET_TYPE_MULTICAST (1 << 4) /* filtered */
47
48 #define SET_ETHERNET_PACKET_FILTER 0x43
49
int51x1_rx_fixup(struct usbnet * dev,struct sk_buff * skb)50 static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
51 {
52 int len;
53
54 if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) {
55 netdev_err(dev->net, "unexpected tiny rx frame\n");
56 return 0;
57 }
58
59 len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]);
60
61 skb_trim(skb, len);
62
63 return 1;
64 }
65
int51x1_tx_fixup(struct usbnet * dev,struct sk_buff * skb,gfp_t flags)66 static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev,
67 struct sk_buff *skb, gfp_t flags)
68 {
69 int pack_len = skb->len;
70 int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE;
71 int headroom = skb_headroom(skb);
72 int tailroom = skb_tailroom(skb);
73 int need_tail = 0;
74 __le16 *len;
75
76 /* if packet and our header is smaler than 64 pad to 64 (+ ZLP) */
77 if ((pack_with_header_len) < dev->maxpacket)
78 need_tail = dev->maxpacket - pack_with_header_len + 1;
79 /*
80 * usbnet would send a ZLP if packetlength mod urbsize == 0 for us,
81 * but we need to know ourself, because this would add to the length
82 * we send down to the device...
83 */
84 else if (!(pack_with_header_len % dev->maxpacket))
85 need_tail = 1;
86
87 if (!skb_cloned(skb) &&
88 (headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) {
89 if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) {
90 skb->data = memmove(skb->head + INT51X1_HEADER_SIZE,
91 skb->data, skb->len);
92 skb_set_tail_pointer(skb, skb->len);
93 }
94 } else {
95 struct sk_buff *skb2;
96
97 skb2 = skb_copy_expand(skb,
98 INT51X1_HEADER_SIZE,
99 need_tail,
100 flags);
101 dev_kfree_skb_any(skb);
102 if (!skb2)
103 return NULL;
104 skb = skb2;
105 }
106
107 pack_len += need_tail;
108 pack_len &= 0x07ff;
109
110 len = (__le16 *) __skb_push(skb, INT51X1_HEADER_SIZE);
111 *len = cpu_to_le16(pack_len);
112
113 if(need_tail)
114 memset(__skb_put(skb, need_tail), 0, need_tail);
115
116 return skb;
117 }
118
int51x1_async_cmd_callback(struct urb * urb)119 static void int51x1_async_cmd_callback(struct urb *urb)
120 {
121 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
122 int status = urb->status;
123
124 if (status < 0)
125 dev_warn(&urb->dev->dev, "async callback failed with %d\n", status);
126
127 kfree(req);
128 usb_free_urb(urb);
129 }
130
int51x1_set_multicast(struct net_device * netdev)131 static void int51x1_set_multicast(struct net_device *netdev)
132 {
133 struct usb_ctrlrequest *req;
134 int status;
135 struct urb *urb;
136 struct usbnet *dev = netdev_priv(netdev);
137 u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST;
138
139 if (netdev->flags & IFF_PROMISC) {
140 /* do not expect to see traffic of other PLCs */
141 filter |= PACKET_TYPE_PROMISCUOUS;
142 netdev_info(dev->net, "promiscuous mode enabled\n");
143 } else if (!netdev_mc_empty(netdev) ||
144 (netdev->flags & IFF_ALLMULTI)) {
145 filter |= PACKET_TYPE_ALL_MULTICAST;
146 netdev_dbg(dev->net, "receive all multicast enabled\n");
147 } else {
148 /* ~PROMISCUOUS, ~MULTICAST */
149 netdev_dbg(dev->net, "receive own packets only\n");
150 }
151
152 urb = usb_alloc_urb(0, GFP_ATOMIC);
153 if (!urb) {
154 netdev_warn(dev->net, "Error allocating URB\n");
155 return;
156 }
157
158 req = kmalloc(sizeof(*req), GFP_ATOMIC);
159 if (!req) {
160 netdev_warn(dev->net, "Error allocating control msg\n");
161 goto out;
162 }
163
164 req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
165 req->bRequest = SET_ETHERNET_PACKET_FILTER;
166 req->wValue = cpu_to_le16(filter);
167 req->wIndex = 0;
168 req->wLength = 0;
169
170 usb_fill_control_urb(urb, dev->udev, usb_sndctrlpipe(dev->udev, 0),
171 (void *)req, NULL, 0,
172 int51x1_async_cmd_callback,
173 (void *)req);
174
175 status = usb_submit_urb(urb, GFP_ATOMIC);
176 if (status < 0) {
177 netdev_warn(dev->net, "Error submitting control msg, sts=%d\n",
178 status);
179 goto out1;
180 }
181 return;
182 out1:
183 kfree(req);
184 out:
185 usb_free_urb(urb);
186 }
187
188 static const struct net_device_ops int51x1_netdev_ops = {
189 .ndo_open = usbnet_open,
190 .ndo_stop = usbnet_stop,
191 .ndo_start_xmit = usbnet_start_xmit,
192 .ndo_tx_timeout = usbnet_tx_timeout,
193 .ndo_change_mtu = usbnet_change_mtu,
194 .ndo_set_mac_address = eth_mac_addr,
195 .ndo_validate_addr = eth_validate_addr,
196 .ndo_set_rx_mode = int51x1_set_multicast,
197 };
198
int51x1_bind(struct usbnet * dev,struct usb_interface * intf)199 static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf)
200 {
201 int status = usbnet_get_ethernet_addr(dev, 3);
202
203 if (status)
204 return status;
205
206 dev->net->hard_header_len += INT51X1_HEADER_SIZE;
207 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
208 dev->net->netdev_ops = &int51x1_netdev_ops;
209
210 return usbnet_get_endpoints(dev, intf);
211 }
212
213 static const struct driver_info int51x1_info = {
214 .description = "Intellon usb powerline adapter",
215 .bind = int51x1_bind,
216 .rx_fixup = int51x1_rx_fixup,
217 .tx_fixup = int51x1_tx_fixup,
218 .in = 1,
219 .out = 2,
220 .flags = FLAG_ETHER,
221 };
222
223 static const struct usb_device_id products[] = {
224 {
225 USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID),
226 .driver_info = (unsigned long) &int51x1_info,
227 },
228 {},
229 };
230 MODULE_DEVICE_TABLE(usb, products);
231
232 static struct usb_driver int51x1_driver = {
233 .name = "int51x1",
234 .id_table = products,
235 .probe = usbnet_probe,
236 .disconnect = usbnet_disconnect,
237 .suspend = usbnet_suspend,
238 .resume = usbnet_resume,
239 };
240
241 module_usb_driver(int51x1_driver);
242
243 MODULE_AUTHOR("Peter Holik");
244 MODULE_DESCRIPTION("Intellon usb powerline adapter");
245 MODULE_LICENSE("GPL");
246