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 * http://www.tandel.be/downloads/INT51X1_Datasheet.pdf
8 *
9 * Based on the work of Jan 'RedBully' Seiffert
10 */
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 0x09e1
26 #define INT51X1_PRODUCT_ID 0x5121
27
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 0x43
37
int51x1_rx_fixup(struct usbnet * dev,struct sk_buff * skb)38 static 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
int51x1_tx_fixup(struct usbnet * dev,struct sk_buff * skb,gfp_t flags)54 static 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 smaler 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 length
70 * 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
int51x1_set_multicast(struct net_device * netdev)107 static 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
130 static 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
int51x1_bind(struct usbnet * dev,struct usb_interface * intf)142 static 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
156 static 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
166 static 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 };
173 MODULE_DEVICE_TABLE(usb, products);
174
175 static 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
185 module_usb_driver(int51x1_driver);
186
187 MODULE_AUTHOR("Peter Holik");
188 MODULE_DESCRIPTION("Intellon usb powerline adapter");
189 MODULE_LICENSE("GPL");
190