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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2009 Peter Holik
*
* Intellon usb PLC (Powerline Communications) usb net driver
*
* http://www.tandel.be/downloads/INT51X1_Datasheet.pdf
*
* Based on the work of Jan 'RedBully' Seiffert
*/
/*
*/
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/slab.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/usbnet.h>
#define INT51X1_VENDOR_ID 0x09e1
#define INT51X1_PRODUCT_ID 0x5121
#define INT51X1_HEADER_SIZE 2 /* 2 byte header */
#define PACKET_TYPE_PROMISCUOUS (1 << 0)
#define PACKET_TYPE_ALL_MULTICAST (1 << 1) /* no filter */
#define PACKET_TYPE_DIRECTED (1 << 2)
#define PACKET_TYPE_BROADCAST (1 << 3)
#define PACKET_TYPE_MULTICAST (1 << 4) /* filtered */
#define SET_ETHERNET_PACKET_FILTER 0x43
static int int51x1_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
int len;
if (!(pskb_may_pull(skb, INT51X1_HEADER_SIZE))) {
netdev_err(dev->net, "unexpected tiny rx frame\n");
return 0;
}
len = le16_to_cpu(*(__le16 *)&skb->data[skb->len - 2]);
skb_trim(skb, len);
return 1;
}
static struct sk_buff *int51x1_tx_fixup(struct usbnet *dev,
struct sk_buff *skb, gfp_t flags)
{
int pack_len = skb->len;
int pack_with_header_len = pack_len + INT51X1_HEADER_SIZE;
int headroom = skb_headroom(skb);
int tailroom = skb_tailroom(skb);
int need_tail = 0;
__le16 *len;
/* if packet and our header is smaller than 64 pad to 64 (+ ZLP) */
if ((pack_with_header_len) < dev->maxpacket)
need_tail = dev->maxpacket - pack_with_header_len + 1;
/*
* usbnet would send a ZLP if packetlength mod urbsize == 0 for us,
* but we need to know ourself, because this would add to the length
* we send down to the device...
*/
else if (!(pack_with_header_len % dev->maxpacket))
need_tail = 1;
if (!skb_cloned(skb) &&
(headroom + tailroom >= need_tail + INT51X1_HEADER_SIZE)) {
if (headroom < INT51X1_HEADER_SIZE || tailroom < need_tail) {
skb->data = memmove(skb->head + INT51X1_HEADER_SIZE,
skb->data, skb->len);
skb_set_tail_pointer(skb, skb->len);
}
} else {
struct sk_buff *skb2;
skb2 = skb_copy_expand(skb,
INT51X1_HEADER_SIZE,
need_tail,
flags);
dev_kfree_skb_any(skb);
if (!skb2)
return NULL;
skb = skb2;
}
pack_len += need_tail;
pack_len &= 0x07ff;
len = __skb_push(skb, INT51X1_HEADER_SIZE);
*len = cpu_to_le16(pack_len);
if(need_tail)
__skb_put_zero(skb, need_tail);
return skb;
}
static void int51x1_set_multicast(struct net_device *netdev)
{
struct usbnet *dev = netdev_priv(netdev);
u16 filter = PACKET_TYPE_DIRECTED | PACKET_TYPE_BROADCAST;
if (netdev->flags & IFF_PROMISC) {
/* do not expect to see traffic of other PLCs */
filter |= PACKET_TYPE_PROMISCUOUS;
netdev_info(dev->net, "promiscuous mode enabled\n");
} else if (!netdev_mc_empty(netdev) ||
(netdev->flags & IFF_ALLMULTI)) {
filter |= PACKET_TYPE_ALL_MULTICAST;
netdev_dbg(dev->net, "receive all multicast enabled\n");
} else {
/* ~PROMISCUOUS, ~MULTICAST */
netdev_dbg(dev->net, "receive own packets only\n");
}
usbnet_write_cmd_async(dev, SET_ETHERNET_PACKET_FILTER,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
filter, 0, NULL, 0);
}
static const struct net_device_ops int51x1_netdev_ops = {
.ndo_open = usbnet_open,
.ndo_stop = usbnet_stop,
.ndo_start_xmit = usbnet_start_xmit,
.ndo_tx_timeout = usbnet_tx_timeout,
.ndo_change_mtu = usbnet_change_mtu,
.ndo_get_stats64 = dev_get_tstats64,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_rx_mode = int51x1_set_multicast,
};
static int int51x1_bind(struct usbnet *dev, struct usb_interface *intf)
{
int status = usbnet_get_ethernet_addr(dev, 3);
if (status)
return status;
dev->net->hard_header_len += INT51X1_HEADER_SIZE;
dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
dev->net->netdev_ops = &int51x1_netdev_ops;
return usbnet_get_endpoints(dev, intf);
}
static const struct driver_info int51x1_info = {
.description = "Intellon usb powerline adapter",
.bind = int51x1_bind,
.rx_fixup = int51x1_rx_fixup,
.tx_fixup = int51x1_tx_fixup,
.in = 1,
.out = 2,
.flags = FLAG_ETHER,
};
static const struct usb_device_id products[] = {
{
USB_DEVICE(INT51X1_VENDOR_ID, INT51X1_PRODUCT_ID),
.driver_info = (unsigned long) &int51x1_info,
},
{},
};
MODULE_DEVICE_TABLE(usb, products);
static struct usb_driver int51x1_driver = {
.name = "int51x1",
.id_table = products,
.probe = usbnet_probe,
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.disable_hub_initiated_lpm = 1,
};
module_usb_driver(int51x1_driver);
MODULE_AUTHOR("Peter Holik");
MODULE_DESCRIPTION("Intellon usb powerline adapter");
MODULE_LICENSE("GPL");
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