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 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 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