329 lines
8.5 KiB
C
329 lines
8.5 KiB
C
/*
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* Driver for USB ethernet port of Conexant CX82310-based ADSL routers
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* Copyright (C) 2010 by Ondrej Zary
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* some parts inspired by the cxacru driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/usbnet.h>
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enum cx82310_cmd {
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CMD_START = 0x84, /* no effect? */
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CMD_STOP = 0x85, /* no effect? */
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CMD_GET_STATUS = 0x90, /* returns nothing? */
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CMD_GET_MAC_ADDR = 0x91, /* read MAC address */
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CMD_GET_LINK_STATUS = 0x92, /* not useful, link is always up */
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CMD_ETHERNET_MODE = 0x99, /* unknown, needed during init */
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};
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enum cx82310_status {
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STATUS_UNDEFINED,
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STATUS_SUCCESS,
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STATUS_ERROR,
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STATUS_UNSUPPORTED,
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STATUS_UNIMPLEMENTED,
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STATUS_PARAMETER_ERROR,
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STATUS_DBG_LOOPBACK,
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};
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#define CMD_PACKET_SIZE 64
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/* first command after power on can take around 8 seconds */
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#define CMD_TIMEOUT 15000
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#define CMD_REPLY_RETRY 5
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#define CX82310_MTU 1514
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#define CMD_EP 0x01
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/*
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* execute control command
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* - optionally send some data (command parameters)
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* - optionally wait for the reply
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* - optionally read some data from the reply
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*/
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static int cx82310_cmd(struct usbnet *dev, enum cx82310_cmd cmd, bool reply,
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u8 *wdata, int wlen, u8 *rdata, int rlen)
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{
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int actual_len, retries, ret;
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struct usb_device *udev = dev->udev;
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u8 *buf = kzalloc(CMD_PACKET_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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/* create command packet */
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buf[0] = cmd;
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if (wdata)
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memcpy(buf + 4, wdata, min_t(int, wlen, CMD_PACKET_SIZE - 4));
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/* send command packet */
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ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, CMD_EP), buf,
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CMD_PACKET_SIZE, &actual_len, CMD_TIMEOUT);
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if (ret < 0) {
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dev_err(&dev->udev->dev, "send command %#x: error %d\n",
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cmd, ret);
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goto end;
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}
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if (reply) {
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/* wait for reply, retry if it's empty */
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for (retries = 0; retries < CMD_REPLY_RETRY; retries++) {
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ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, CMD_EP),
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buf, CMD_PACKET_SIZE, &actual_len,
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CMD_TIMEOUT);
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if (ret < 0) {
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dev_err(&dev->udev->dev,
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"reply receive error %d\n", ret);
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goto end;
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}
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if (actual_len > 0)
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break;
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}
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if (actual_len == 0) {
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dev_err(&dev->udev->dev, "no reply to command %#x\n",
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cmd);
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ret = -EIO;
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goto end;
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}
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if (buf[0] != cmd) {
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dev_err(&dev->udev->dev,
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"got reply to command %#x, expected: %#x\n",
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buf[0], cmd);
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ret = -EIO;
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goto end;
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}
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if (buf[1] != STATUS_SUCCESS) {
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dev_err(&dev->udev->dev, "command %#x failed: %#x\n",
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cmd, buf[1]);
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ret = -EIO;
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goto end;
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}
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if (rdata)
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memcpy(rdata, buf + 4,
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min_t(int, rlen, CMD_PACKET_SIZE - 4));
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}
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end:
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kfree(buf);
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return ret;
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}
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#define partial_len data[0] /* length of partial packet data */
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#define partial_rem data[1] /* remaining (missing) data length */
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#define partial_data data[2] /* partial packet data */
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static int cx82310_bind(struct usbnet *dev, struct usb_interface *intf)
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{
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int ret;
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char buf[15];
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struct usb_device *udev = dev->udev;
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/* avoid ADSL modems - continue only if iProduct is "USB NET CARD" */
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if (usb_string(udev, udev->descriptor.iProduct, buf, sizeof(buf)) > 0
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&& strcmp(buf, "USB NET CARD")) {
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dev_info(&udev->dev, "ignoring: probably an ADSL modem\n");
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return -ENODEV;
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}
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ret = usbnet_get_endpoints(dev, intf);
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if (ret)
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return ret;
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/*
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* this must not include ethernet header as the device can send partial
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* packets with no header (and sometimes even empty URBs)
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*/
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dev->net->hard_header_len = 0;
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/* we can send at most 1514 bytes of data (+ 2-byte header) per URB */
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dev->hard_mtu = CX82310_MTU + 2;
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/* we can receive URBs up to 4KB from the device */
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dev->rx_urb_size = 4096;
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dev->partial_data = (unsigned long) kmalloc(dev->hard_mtu, GFP_KERNEL);
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if (!dev->partial_data)
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return -ENOMEM;
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/* enable ethernet mode (?) */
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ret = cx82310_cmd(dev, CMD_ETHERNET_MODE, true, "\x01", 1, NULL, 0);
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if (ret) {
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dev_err(&udev->dev, "unable to enable ethernet mode: %d\n",
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ret);
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goto err;
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}
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/* get the MAC address */
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ret = cx82310_cmd(dev, CMD_GET_MAC_ADDR, true, NULL, 0,
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dev->net->dev_addr, ETH_ALEN);
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if (ret) {
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dev_err(&udev->dev, "unable to read MAC address: %d\n", ret);
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goto err;
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}
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/* start (does not seem to have any effect?) */
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ret = cx82310_cmd(dev, CMD_START, false, NULL, 0, NULL, 0);
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if (ret)
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goto err;
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return 0;
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err:
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kfree((void *)dev->partial_data);
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return ret;
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}
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static void cx82310_unbind(struct usbnet *dev, struct usb_interface *intf)
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{
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kfree((void *)dev->partial_data);
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}
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/*
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* RX is NOT easy - we can receive multiple packets per skb, each having 2-byte
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* packet length at the beginning.
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* The last packet might be incomplete (when it crosses the 4KB URB size),
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* continuing in the next skb (without any headers).
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* If a packet has odd length, there is one extra byte at the end (before next
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* packet or at the end of the URB).
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*/
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static int cx82310_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
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{
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int len;
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struct sk_buff *skb2;
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/*
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* If the last skb ended with an incomplete packet, this skb contains
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* end of that packet at the beginning.
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*/
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if (dev->partial_rem) {
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len = dev->partial_len + dev->partial_rem;
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skb2 = alloc_skb(len, GFP_ATOMIC);
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if (!skb2)
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return 0;
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skb_put(skb2, len);
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memcpy(skb2->data, (void *)dev->partial_data,
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dev->partial_len);
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memcpy(skb2->data + dev->partial_len, skb->data,
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dev->partial_rem);
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usbnet_skb_return(dev, skb2);
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skb_pull(skb, (dev->partial_rem + 1) & ~1);
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dev->partial_rem = 0;
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if (skb->len < 2)
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return 1;
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}
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/* a skb can contain multiple packets */
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while (skb->len > 1) {
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/* first two bytes are packet length */
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len = skb->data[0] | (skb->data[1] << 8);
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skb_pull(skb, 2);
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/* if last packet in the skb, let usbnet to process it */
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if (len == skb->len || len + 1 == skb->len) {
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skb_trim(skb, len);
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break;
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}
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if (len > CX82310_MTU) {
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dev_err(&dev->udev->dev, "RX packet too long: %d B\n",
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len);
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return 0;
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}
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/* incomplete packet, save it for the next skb */
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if (len > skb->len) {
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dev->partial_len = skb->len;
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dev->partial_rem = len - skb->len;
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memcpy((void *)dev->partial_data, skb->data,
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dev->partial_len);
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skb_pull(skb, skb->len);
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break;
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}
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skb2 = alloc_skb(len, GFP_ATOMIC);
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if (!skb2)
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return 0;
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skb_put(skb2, len);
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memcpy(skb2->data, skb->data, len);
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/* process the packet */
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usbnet_skb_return(dev, skb2);
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skb_pull(skb, (len + 1) & ~1);
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}
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/* let usbnet process the last packet */
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return 1;
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}
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/* TX is easy, just add 2 bytes of length at the beginning */
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static struct sk_buff *cx82310_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
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gfp_t flags)
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{
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int len = skb->len;
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if (skb_headroom(skb) < 2) {
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struct sk_buff *skb2 = skb_copy_expand(skb, 2, 0, flags);
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dev_kfree_skb_any(skb);
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skb = skb2;
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if (!skb)
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return NULL;
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}
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skb_push(skb, 2);
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skb->data[0] = len;
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skb->data[1] = len >> 8;
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return skb;
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}
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static const struct driver_info cx82310_info = {
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.description = "Conexant CX82310 USB ethernet",
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.flags = FLAG_ETHER,
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.bind = cx82310_bind,
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.unbind = cx82310_unbind,
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.rx_fixup = cx82310_rx_fixup,
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.tx_fixup = cx82310_tx_fixup,
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};
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static const struct usb_device_id products[] = {
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{
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USB_DEVICE_AND_INTERFACE_INFO(0x0572, 0xcb01, 0xff, 0, 0),
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.driver_info = (unsigned long) &cx82310_info
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},
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{ },
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};
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MODULE_DEVICE_TABLE(usb, products);
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static struct usb_driver cx82310_driver = {
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.name = "cx82310_eth",
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.id_table = products,
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.probe = usbnet_probe,
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.disconnect = usbnet_disconnect,
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.suspend = usbnet_suspend,
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.resume = usbnet_resume,
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.disable_hub_initiated_lpm = 1,
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};
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module_usb_driver(cx82310_driver);
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MODULE_AUTHOR("Ondrej Zary");
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MODULE_DESCRIPTION("Conexant CX82310-based ADSL router USB ethernet driver");
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MODULE_LICENSE("GPL");
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