/*
   *  Copyright (c) 2001 Vojtech Pavlik
   *
   *  CATC EL1210A NetMate USB Ethernet driver
   *
   *  Sponsored by SuSE
   *
   *  Based on the work of
   *		Donald Becker
   * 
   *  Old chipset support added by Simon Evans <spse@secret.org.uk> 2002
   *    - adds support for Belkin F5U011
   */
  
  /*
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or 
   * (at your option) any later version.
   * 
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, see <http://www.gnu.org/licenses/>.
   * 
   * Should you need to contact me, the author, you can do so either by
   * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
   * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
   */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/string.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  #include <linux/spinlock.h>
  #include <linux/ethtool.h>
  #include <linux/crc32.h>
  #include <linux/bitops.h>
  #include <linux/gfp.h>
  #include <asm/uaccess.h>
  
  #undef DEBUG
  
  #include <linux/usb.h>
  
  /*
   * Version information.
   */
  
  #define DRIVER_VERSION "v2.8"
  #define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@suse.cz>"
  #define DRIVER_DESC "CATC EL1210A NetMate USB Ethernet driver"
  #define SHORT_DRIVER_DESC "EL1210A NetMate USB Ethernet"
  
  MODULE_AUTHOR(DRIVER_AUTHOR);
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL");
  
  static const char driver_name[] = "catc";
  
  /*
   * Some defines.
   */ 
  
  #define STATS_UPDATE		(HZ)	/* Time between stats updates */
  #define TX_TIMEOUT		(5*HZ)	/* Max time the queue can be stopped */
  #define PKT_SZ			1536	/* Max Ethernet packet size */
  #define RX_MAX_BURST		15	/* Max packets per rx buffer (> 0, < 16) */
  #define TX_MAX_BURST		15	/* Max full sized packets per tx buffer (> 0) */
  #define CTRL_QUEUE		16	/* Max control requests in flight (power of two) */
  #define RX_PKT_SZ		1600	/* Max size of receive packet for F5U011 */
  
  /*
   * Control requests.
   */
  
  enum control_requests {
  	ReadMem =	0xf1,
  	GetMac =	0xf2,
  	Reset =		0xf4,
  	SetMac =	0xf5,
  	SetRxMode =     0xf5,  /* F5U011 only */
  	WriteROM =	0xf8,
  	SetReg =	0xfa,
  	GetReg =	0xfb,
  	WriteMem =	0xfc,
  	ReadROM =	0xfd,
  };
  
  /*
   * Registers.
   */
  
  enum register_offsets {
  	TxBufCount =	0x20,
  	RxBufCount =	0x21,
  	OpModes =	0x22,
  	TxQed =		0x23,
  	RxQed =		0x24,
  	MaxBurst =	0x25,
  	RxUnit =	0x60,
  	EthStatus =	0x61,
  	StationAddr0 =	0x67,
  	EthStats =	0x69,
  	LEDCtrl =	0x81,
  };
  
  enum eth_stats {
  	TxSingleColl =	0x00,
          TxMultiColl =	0x02,
          TxExcessColl =	0x04,
          RxFramErr =	0x06,
  };
  
  enum op_mode_bits {
  	Op3MemWaits =	0x03,
  	OpLenInclude =	0x08,
  	OpRxMerge =	0x10,
  	OpTxMerge =	0x20,
  	OpWin95bugfix =	0x40,
  	OpLoopback =	0x80,
  };
  
  enum rx_filter_bits {
  	RxEnable =	0x01,
  	RxPolarity =	0x02,
  	RxForceOK =	0x04,
  	RxMultiCast =	0x08,
  	RxPromisc =	0x10,
  	AltRxPromisc =  0x20, /* F5U011 uses different bit */
  };
  
  enum led_values {
  	LEDFast = 	0x01,
  	LEDSlow =	0x02,
  	LEDFlash =	0x03,
  	LEDPulse =	0x04,
  	LEDLink =	0x08,
  };
  
  enum link_status {
  	LinkNoChange = 0,
  	LinkGood     = 1,
  	LinkBad      = 2
  };
  
  /*
   * The catc struct.
   */
  
  #define CTRL_RUNNING	0
  #define RX_RUNNING	1
  #define TX_RUNNING	2
  
  struct catc {
  	struct net_device *netdev;
  	struct usb_device *usbdev;
  
  	unsigned long flags;
  
  	unsigned int tx_ptr, tx_idx;
  	unsigned int ctrl_head, ctrl_tail;
  	spinlock_t tx_lock, ctrl_lock;
  
  	u8 tx_buf[2][TX_MAX_BURST * (PKT_SZ + 2)];
  	u8 rx_buf[RX_MAX_BURST * (PKT_SZ + 2)];
  	u8 irq_buf[2];
  	u8 ctrl_buf[64];
  	struct usb_ctrlrequest ctrl_dr;
  
  	struct timer_list timer;
  	u8 stats_buf[8];
  	u16 stats_vals[4];
  	unsigned long last_stats;
  
  	u8 multicast[64];
  
  	struct ctrl_queue {
  		u8 dir;
  		u8 request;
  		u16 value;
  		u16 index;
  		void *buf;
  		int len;
  		void (*callback)(struct catc *catc, struct ctrl_queue *q);
  	} ctrl_queue[CTRL_QUEUE];
  
  	struct urb *tx_urb, *rx_urb, *irq_urb, *ctrl_urb;
  
  	u8 is_f5u011;	/* Set if device is an F5U011 */
  	u8 rxmode[2];	/* Used for F5U011 */
  	atomic_t recq_sz; /* Used for F5U011 - counter of waiting rx packets */
  };
  
  /*
   * Useful macros.
   */
  
  #define catc_get_mac(catc, mac)				catc_ctrl_msg(catc, USB_DIR_IN,  GetMac, 0, 0, mac,  6)
  #define catc_reset(catc)				catc_ctrl_msg(catc, USB_DIR_OUT, Reset, 0, 0, NULL, 0)
  #define catc_set_reg(catc, reg, val)			catc_ctrl_msg(catc, USB_DIR_OUT, SetReg, val, reg, NULL, 0)
  #define catc_get_reg(catc, reg, buf)			catc_ctrl_msg(catc, USB_DIR_IN,  GetReg, 0, reg, buf, 1)
  #define catc_write_mem(catc, addr, buf, size)		catc_ctrl_msg(catc, USB_DIR_OUT, WriteMem, 0, addr, buf, size)
  #define catc_read_mem(catc, addr, buf, size)		catc_ctrl_msg(catc, USB_DIR_IN,  ReadMem, 0, addr, buf, size)
  
  #define f5u011_rxmode(catc, rxmode)			catc_ctrl_msg(catc, USB_DIR_OUT, SetRxMode, 0, 1, rxmode, 2)
  #define f5u011_rxmode_async(catc, rxmode)		catc_ctrl_async(catc, USB_DIR_OUT, SetRxMode, 0, 1, &rxmode, 2, NULL)
  #define f5u011_mchash_async(catc, hash)			catc_ctrl_async(catc, USB_DIR_OUT, SetRxMode, 0, 2, &hash, 8, NULL)
  
  #define catc_set_reg_async(catc, reg, val)		catc_ctrl_async(catc, USB_DIR_OUT, SetReg, val, reg, NULL, 0, NULL)
  #define catc_get_reg_async(catc, reg, cb)		catc_ctrl_async(catc, USB_DIR_IN, GetReg, 0, reg, NULL, 1, cb)
  #define catc_write_mem_async(catc, addr, buf, size)	catc_ctrl_async(catc, USB_DIR_OUT, WriteMem, 0, addr, buf, size, NULL)
  
  /*
   * Receive routines.
   */
  
  static void catc_rx_done(struct urb *urb)
  {
  	struct catc *catc = urb->context;
  	u8 *pkt_start = urb->transfer_buffer;
  	struct sk_buff *skb;
  	int pkt_len, pkt_offset = 0;
  	int status = urb->status;
  
  	if (!catc->is_f5u011) {
  		clear_bit(RX_RUNNING, &catc->flags);
  		pkt_offset = 2;
  	}
  
  	if (status) {
  		dev_dbg(&urb->dev->dev, "rx_done, status %d, length %d
  ",
  			status, urb->actual_length);
  		return;
  	}
  
  	do {
  		if(!catc->is_f5u011) {
  			pkt_len = le16_to_cpup((__le16*)pkt_start);
  			if (pkt_len > urb->actual_length) {
  				catc->netdev->stats.rx_length_errors++;
  				catc->netdev->stats.rx_errors++;
  				break;
  			}
  		} else {
  			pkt_len = urb->actual_length;
  		}
  
  		if (!(skb = dev_alloc_skb(pkt_len)))
  			return;
  
  		skb_copy_to_linear_data(skb, pkt_start + pkt_offset, pkt_len);
  		skb_put(skb, pkt_len);
  
  		skb->protocol = eth_type_trans(skb, catc->netdev);
  		netif_rx(skb);
  
  		catc->netdev->stats.rx_packets++;
  		catc->netdev->stats.rx_bytes += pkt_len;
  
  		/* F5U011 only does one packet per RX */
  		if (catc->is_f5u011)
  			break;
  		pkt_start += (((pkt_len + 1) >> 6) + 1) << 6;
  
  	} while (pkt_start - (u8 *) urb->transfer_buffer < urb->actual_length);
  
  	if (catc->is_f5u011) {
  		if (atomic_read(&catc->recq_sz)) {
  			int state;
  			atomic_dec(&catc->recq_sz);
  			netdev_dbg(catc->netdev, "getting extra packet
  ");
  			urb->dev = catc->usbdev;
  			if ((state = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
  				netdev_dbg(catc->netdev,
  					   "submit(rx_urb) status %d
  ", state);
  			}
  		} else {
  			clear_bit(RX_RUNNING, &catc->flags);
  		}
  	}
  }
  
  static void catc_irq_done(struct urb *urb)
  {
  	struct catc *catc = urb->context;
  	u8 *data = urb->transfer_buffer;
  	int status = urb->status;
  	unsigned int hasdata = 0, linksts = LinkNoChange;
  	int res;
  
  	if (!catc->is_f5u011) {
  		hasdata = data[1] & 0x80;
  		if (data[1] & 0x40)
  			linksts = LinkGood;
  		else if (data[1] & 0x20)
  			linksts = LinkBad;
  	} else {
  		hasdata = (unsigned int)(be16_to_cpup((__be16*)data) & 0x0fff);
  		if (data[0] == 0x90)
  			linksts = LinkGood;
  		else if (data[0] == 0xA0)
  			linksts = LinkBad;
  	}
  
  	switch (status) {
  	case 0:			/* success */
  		break;
  	case -ECONNRESET:	/* unlink */
  	case -ENOENT:
  	case -ESHUTDOWN:
  		return;
  	/* -EPIPE:  should clear the halt */
  	default:		/* error */
  		dev_dbg(&urb->dev->dev,
  			"irq_done, status %d, data %02x %02x.
  ",
  			status, data[0], data[1]);
  		goto resubmit;
  	}
  
  	if (linksts == LinkGood) {
  		netif_carrier_on(catc->netdev);
  		netdev_dbg(catc->netdev, "link ok
  ");
  	}
  
  	if (linksts == LinkBad) {
  		netif_carrier_off(catc->netdev);
  		netdev_dbg(catc->netdev, "link bad
  ");
  	}
  
  	if (hasdata) {
  		if (test_and_set_bit(RX_RUNNING, &catc->flags)) {
  			if (catc->is_f5u011)
  				atomic_inc(&catc->recq_sz);
  		} else {
  			catc->rx_urb->dev = catc->usbdev;
  			if ((res = usb_submit_urb(catc->rx_urb, GFP_ATOMIC)) < 0) {
  				dev_err(&catc->usbdev->dev,
  					"submit(rx_urb) status %d
  ", res);
  			}
  		} 
  	}
  resubmit:
  	res = usb_submit_urb (urb, GFP_ATOMIC);
  	if (res)
  		dev_err(&catc->usbdev->dev,
  			"can't resubmit intr, %s-%s, status %d
  ",
  			catc->usbdev->bus->bus_name,
  			catc->usbdev->devpath, res);
  }
  
  /*
   * Transmit routines.
   */
  
  static int catc_tx_run(struct catc *catc)
  {
  	int status;
  
  	if (catc->is_f5u011)
  		catc->tx_ptr = (catc->tx_ptr + 63) & ~63;
  
  	catc->tx_urb->transfer_buffer_length = catc->tx_ptr;
  	catc->tx_urb->transfer_buffer = catc->tx_buf[catc->tx_idx];
  	catc->tx_urb->dev = catc->usbdev;
  
  	if ((status = usb_submit_urb(catc->tx_urb, GFP_ATOMIC)) < 0)
  		dev_err(&catc->usbdev->dev, "submit(tx_urb), status %d
  ",
  			status);
  
  	catc->tx_idx = !catc->tx_idx;
  	catc->tx_ptr = 0;
  
  	catc->netdev->trans_start = jiffies;
  	return status;
  }
  
  static void catc_tx_done(struct urb *urb)
  {
  	struct catc *catc = urb->context;
  	unsigned long flags;
  	int r, status = urb->status;
  
  	if (status == -ECONNRESET) {
  		dev_dbg(&urb->dev->dev, "Tx Reset.
  ");
  		urb->status = 0;
  		catc->netdev->trans_start = jiffies;
  		catc->netdev->stats.tx_errors++;
  		clear_bit(TX_RUNNING, &catc->flags);
  		netif_wake_queue(catc->netdev);
  		return;
  	}
  
  	if (status) {
  		dev_dbg(&urb->dev->dev, "tx_done, status %d, length %d
  ",
  			status, urb->actual_length);
  		return;
  	}
  
  	spin_lock_irqsave(&catc->tx_lock, flags);
  
  	if (catc->tx_ptr) {
  		r = catc_tx_run(catc);
  		if (unlikely(r < 0))
  			clear_bit(TX_RUNNING, &catc->flags);
  	} else {
  		clear_bit(TX_RUNNING, &catc->flags);
  	}
  
  	netif_wake_queue(catc->netdev);
  
  	spin_unlock_irqrestore(&catc->tx_lock, flags);
  }
  
  static netdev_tx_t catc_start_xmit(struct sk_buff *skb,
  					 struct net_device *netdev)
  {
  	struct catc *catc = netdev_priv(netdev);
  	unsigned long flags;
  	int r = 0;
  	char *tx_buf;
  
  	spin_lock_irqsave(&catc->tx_lock, flags);
  
  	catc->tx_ptr = (((catc->tx_ptr - 1) >> 6) + 1) << 6;
  	tx_buf = catc->tx_buf[catc->tx_idx] + catc->tx_ptr;
  	if (catc->is_f5u011)
  		*(__be16 *)tx_buf = cpu_to_be16(skb->len);
  	else
  		*(__le16 *)tx_buf = cpu_to_le16(skb->len);
  	skb_copy_from_linear_data(skb, tx_buf + 2, skb->len);
  	catc->tx_ptr += skb->len + 2;
  
  	if (!test_and_set_bit(TX_RUNNING, &catc->flags)) {
  		r = catc_tx_run(catc);
  		if (r < 0)
  			clear_bit(TX_RUNNING, &catc->flags);
  	}
  
  	if ((catc->is_f5u011 && catc->tx_ptr) ||
  	    (catc->tx_ptr >= ((TX_MAX_BURST - 1) * (PKT_SZ + 2))))
  		netif_stop_queue(netdev);
  
  	spin_unlock_irqrestore(&catc->tx_lock, flags);
  
  	if (r >= 0) {
  		catc->netdev->stats.tx_bytes += skb->len;
  		catc->netdev->stats.tx_packets++;
  	}
  
  	dev_kfree_skb(skb);
  
  	return NETDEV_TX_OK;
  }
  
  static void catc_tx_timeout(struct net_device *netdev)
  {
  	struct catc *catc = netdev_priv(netdev);
  
  	dev_warn(&netdev->dev, "Transmit timed out.
  ");
  	usb_unlink_urb(catc->tx_urb);
  }
  
  /*
   * Control messages.
   */
  
  static int catc_ctrl_msg(struct catc *catc, u8 dir, u8 request, u16 value, u16 index, void *buf, int len)
  {
          int retval = usb_control_msg(catc->usbdev,
  		dir ? usb_rcvctrlpipe(catc->usbdev, 0) : usb_sndctrlpipe(catc->usbdev, 0),
  		 request, 0x40 | dir, value, index, buf, len, 1000);
          return retval < 0 ? retval : 0;
  }
  
  static void catc_ctrl_run(struct catc *catc)
  {
  	struct ctrl_queue *q = catc->ctrl_queue + catc->ctrl_tail;
  	struct usb_device *usbdev = catc->usbdev;
  	struct urb *urb = catc->ctrl_urb;
  	struct usb_ctrlrequest *dr = &catc->ctrl_dr;
  	int status;
  
  	dr->bRequest = q->request;
  	dr->bRequestType = 0x40 | q->dir;
  	dr->wValue = cpu_to_le16(q->value);
  	dr->wIndex = cpu_to_le16(q->index);
  	dr->wLength = cpu_to_le16(q->len);
  
          urb->pipe = q->dir ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0);
  	urb->transfer_buffer_length = q->len;
  	urb->transfer_buffer = catc->ctrl_buf;
  	urb->setup_packet = (void *) dr;
  	urb->dev = usbdev;
  
  	if (!q->dir && q->buf && q->len)
  		memcpy(catc->ctrl_buf, q->buf, q->len);
  
  	if ((status = usb_submit_urb(catc->ctrl_urb, GFP_ATOMIC)))
  		dev_err(&catc->usbdev->dev, "submit(ctrl_urb) status %d
  ",
  			status);
  }
  
  static void catc_ctrl_done(struct urb *urb)
  {
  	struct catc *catc = urb->context;
  	struct ctrl_queue *q;
  	unsigned long flags;
  	int status = urb->status;
  
  	if (status)
  		dev_dbg(&urb->dev->dev, "ctrl_done, status %d, len %d.
  ",
  			status, urb->actual_length);
  
  	spin_lock_irqsave(&catc->ctrl_lock, flags);
  
  	q = catc->ctrl_queue + catc->ctrl_tail;
  
  	if (q->dir) {
  		if (q->buf && q->len)
  			memcpy(q->buf, catc->ctrl_buf, q->len);
  		else
  			q->buf = catc->ctrl_buf;
  	}
  
  	if (q->callback)
  		q->callback(catc, q);
  
  	catc->ctrl_tail = (catc->ctrl_tail + 1) & (CTRL_QUEUE - 1);
  
  	if (catc->ctrl_head != catc->ctrl_tail)
  		catc_ctrl_run(catc);
  	else
  		clear_bit(CTRL_RUNNING, &catc->flags);
  
  	spin_unlock_irqrestore(&catc->ctrl_lock, flags);
  }
  
  static int catc_ctrl_async(struct catc *catc, u8 dir, u8 request, u16 value,
  	u16 index, void *buf, int len, void (*callback)(struct catc *catc, struct ctrl_queue *q))
  {
  	struct ctrl_queue *q;
  	int retval = 0;
  	unsigned long flags;
  
  	spin_lock_irqsave(&catc->ctrl_lock, flags);
  	
  	q = catc->ctrl_queue + catc->ctrl_head;
  
  	q->dir = dir;
  	q->request = request;
  	q->value = value;
  	q->index = index;
  	q->buf = buf;
  	q->len = len;
  	q->callback = callback;
  
  	catc->ctrl_head = (catc->ctrl_head + 1) & (CTRL_QUEUE - 1);
  
  	if (catc->ctrl_head == catc->ctrl_tail) {
  		dev_err(&catc->usbdev->dev, "ctrl queue full
  ");
  		catc->ctrl_tail = (catc->ctrl_tail + 1) & (CTRL_QUEUE - 1);
  		retval = -1;
  	}
  
  	if (!test_and_set_bit(CTRL_RUNNING, &catc->flags))
  		catc_ctrl_run(catc);
  
  	spin_unlock_irqrestore(&catc->ctrl_lock, flags);
  
  	return retval;
  }
  
  /*
   * Statistics.
   */
  
  static void catc_stats_done(struct catc *catc, struct ctrl_queue *q)
  {
  	int index = q->index - EthStats;
  	u16 data, last;
  
  	catc->stats_buf[index] = *((char *)q->buf);
  
  	if (index & 1)
  		return;
  
  	data = ((u16)catc->stats_buf[index] << 8) | catc->stats_buf[index + 1];
  	last = catc->stats_vals[index >> 1];
  
  	switch (index) {
  		case TxSingleColl:
  		case TxMultiColl:
  			catc->netdev->stats.collisions += data - last;
  			break;
  		case TxExcessColl:
  			catc->netdev->stats.tx_aborted_errors += data - last;
  			catc->netdev->stats.tx_errors += data - last;
  			break;
  		case RxFramErr:
  			catc->netdev->stats.rx_frame_errors += data - last;
  			catc->netdev->stats.rx_errors += data - last;
  			break;
  	}
  
  	catc->stats_vals[index >> 1] = data;
  }
  
  static void catc_stats_timer(unsigned long data)
  {
  	struct catc *catc = (void *) data;
  	int i;
  
  	for (i = 0; i < 8; i++)
  		catc_get_reg_async(catc, EthStats + 7 - i, catc_stats_done);
  
  	mod_timer(&catc->timer, jiffies + STATS_UPDATE);
  }
  
  /*
   * Receive modes. Broadcast, Multicast, Promisc.
   */
  
  static void catc_multicast(unsigned char *addr, u8 *multicast)
  {
  	u32 crc;
  
  	crc = ether_crc_le(6, addr);
  	multicast[(crc >> 3) & 0x3f] |= 1 << (crc & 7);
  }
  
  static void catc_set_multicast_list(struct net_device *netdev)
  {
  	struct catc *catc = netdev_priv(netdev);
  	struct netdev_hw_addr *ha;
  	u8 broadcast[ETH_ALEN];
  	u8 rx = RxEnable | RxPolarity | RxMultiCast;
  
  	eth_broadcast_addr(broadcast);
  	memset(catc->multicast, 0, 64);
  
  	catc_multicast(broadcast, catc->multicast);
  	catc_multicast(netdev->dev_addr, catc->multicast);
  
  	if (netdev->flags & IFF_PROMISC) {
  		memset(catc->multicast, 0xff, 64);
  		rx |= (!catc->is_f5u011) ? RxPromisc : AltRxPromisc;
  	} 
  
  	if (netdev->flags & IFF_ALLMULTI) {
  		memset(catc->multicast, 0xff, 64);
  	} else {
  		netdev_for_each_mc_addr(ha, netdev) {
  			u32 crc = ether_crc_le(6, ha->addr);
  			if (!catc->is_f5u011) {
  				catc->multicast[(crc >> 3) & 0x3f] |= 1 << (crc & 7);
  			} else {
  				catc->multicast[7-(crc >> 29)] |= 1 << ((crc >> 26) & 7);
  			}
  		}
  	}
  	if (!catc->is_f5u011) {
  		catc_set_reg_async(catc, RxUnit, rx);
  		catc_write_mem_async(catc, 0xfa80, catc->multicast, 64);
  	} else {
  		f5u011_mchash_async(catc, catc->multicast);
  		if (catc->rxmode[0] != rx) {
  			catc->rxmode[0] = rx;
  			netdev_dbg(catc->netdev,
  				   "Setting RX mode to %2.2X %2.2X
  ",
  				   catc->rxmode[0], catc->rxmode[1]);
  			f5u011_rxmode_async(catc, catc->rxmode);
  		}
  	}
  }
  
  static void catc_get_drvinfo(struct net_device *dev,
  			     struct ethtool_drvinfo *info)
  {
  	struct catc *catc = netdev_priv(dev);
  	strlcpy(info->driver, driver_name, sizeof(info->driver));
  	strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
  	usb_make_path(catc->usbdev, info->bus_info, sizeof(info->bus_info));
  }
  
  static int catc_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
  {
  	struct catc *catc = netdev_priv(dev);
  	if (!catc->is_f5u011)
  		return -EOPNOTSUPP;
  
  	cmd->supported = SUPPORTED_10baseT_Half | SUPPORTED_TP;
  	cmd->advertising = ADVERTISED_10baseT_Half | ADVERTISED_TP;
  	ethtool_cmd_speed_set(cmd, SPEED_10);
  	cmd->duplex = DUPLEX_HALF;
  	cmd->port = PORT_TP; 
  	cmd->phy_address = 0;
  	cmd->transceiver = XCVR_INTERNAL;
  	cmd->autoneg = AUTONEG_DISABLE;
  	cmd->maxtxpkt = 1;
  	cmd->maxrxpkt = 1;
  	return 0;
  }
  
  static const struct ethtool_ops ops = {
  	.get_drvinfo = catc_get_drvinfo,
  	.get_settings = catc_get_settings,
  	.get_link = ethtool_op_get_link
  };
  
  /*
   * Open, close.
   */
  
  static int catc_open(struct net_device *netdev)
  {
  	struct catc *catc = netdev_priv(netdev);
  	int status;
  
  	catc->irq_urb->dev = catc->usbdev;
  	if ((status = usb_submit_urb(catc->irq_urb, GFP_KERNEL)) < 0) {
  		dev_err(&catc->usbdev->dev, "submit(irq_urb) status %d
  ",
  			status);
  		return -1;
  	}
  
  	netif_start_queue(netdev);
  
  	if (!catc->is_f5u011)
  		mod_timer(&catc->timer, jiffies + STATS_UPDATE);
  
  	return 0;
  }
  
  static int catc_stop(struct net_device *netdev)
  {
  	struct catc *catc = netdev_priv(netdev);
  
  	netif_stop_queue(netdev);
  
  	if (!catc->is_f5u011)
  		del_timer_sync(&catc->timer);
  
  	usb_kill_urb(catc->rx_urb);
  	usb_kill_urb(catc->tx_urb);
  	usb_kill_urb(catc->irq_urb);
  	usb_kill_urb(catc->ctrl_urb);
  
  	return 0;
  }
  
  static const struct net_device_ops catc_netdev_ops = {
  	.ndo_open		= catc_open,
  	.ndo_stop		= catc_stop,
  	.ndo_start_xmit		= catc_start_xmit,
  
  	.ndo_tx_timeout		= catc_tx_timeout,
  	.ndo_set_rx_mode	= catc_set_multicast_list,
  	.ndo_change_mtu		= eth_change_mtu,
  	.ndo_set_mac_address 	= eth_mac_addr,
  	.ndo_validate_addr	= eth_validate_addr,
  };
  
  /*
   * USB probe, disconnect.
   */
  
  static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id)
  {
  	struct device *dev = &intf->dev;
  	struct usb_device *usbdev = interface_to_usbdev(intf);
  	struct net_device *netdev;
  	struct catc *catc;
  	u8 broadcast[ETH_ALEN];
  	int i, pktsz;
  
  	if (usb_set_interface(usbdev,
  			intf->altsetting->desc.bInterfaceNumber, 1)) {
  		dev_err(dev, "Can't set altsetting 1.
  ");
  		return -EIO;
  	}
  
  	netdev = alloc_etherdev(sizeof(struct catc));
  	if (!netdev)
  		return -ENOMEM;
  
  	catc = netdev_priv(netdev);
  
  	netdev->netdev_ops = &catc_netdev_ops;
  	netdev->watchdog_timeo = TX_TIMEOUT;
  	netdev->ethtool_ops = &ops;
  
  	catc->usbdev = usbdev;
  	catc->netdev = netdev;
  
  	spin_lock_init(&catc->tx_lock);
  	spin_lock_init(&catc->ctrl_lock);
  
  	init_timer(&catc->timer);
  	catc->timer.data = (long) catc;
  	catc->timer.function = catc_stats_timer;
  
  	catc->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);
  	catc->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
  	catc->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
  	catc->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
  	if ((!catc->ctrl_urb) || (!catc->tx_urb) || 
  	    (!catc->rx_urb) || (!catc->irq_urb)) {
  		dev_err(&intf->dev, "No free urbs available.
  ");
  		usb_free_urb(catc->ctrl_urb);
  		usb_free_urb(catc->tx_urb);
  		usb_free_urb(catc->rx_urb);
  		usb_free_urb(catc->irq_urb);
  		free_netdev(netdev);
  		return -ENOMEM;
  	}
  
  	/* The F5U011 has the same vendor/product as the netmate but a device version of 0x130 */
  	if (le16_to_cpu(usbdev->descriptor.idVendor) == 0x0423 && 
  	    le16_to_cpu(usbdev->descriptor.idProduct) == 0xa &&
  	    le16_to_cpu(catc->usbdev->descriptor.bcdDevice) == 0x0130) {
  		dev_dbg(dev, "Testing for f5u011
  ");
  		catc->is_f5u011 = 1;		
  		atomic_set(&catc->recq_sz, 0);
  		pktsz = RX_PKT_SZ;
  	} else {
  		pktsz = RX_MAX_BURST * (PKT_SZ + 2);
  	}
  	
  	usb_fill_control_urb(catc->ctrl_urb, usbdev, usb_sndctrlpipe(usbdev, 0),
  		NULL, NULL, 0, catc_ctrl_done, catc);
  
  	usb_fill_bulk_urb(catc->tx_urb, usbdev, usb_sndbulkpipe(usbdev, 1),
  		NULL, 0, catc_tx_done, catc);
  
  	usb_fill_bulk_urb(catc->rx_urb, usbdev, usb_rcvbulkpipe(usbdev, 1),
  		catc->rx_buf, pktsz, catc_rx_done, catc);
  
  	usb_fill_int_urb(catc->irq_urb, usbdev, usb_rcvintpipe(usbdev, 2),
                  catc->irq_buf, 2, catc_irq_done, catc, 1);
  
  	if (!catc->is_f5u011) {
  		dev_dbg(dev, "Checking memory size
  ");
  
  		i = 0x12345678;
  		catc_write_mem(catc, 0x7a80, &i, 4);
  		i = 0x87654321;	
  		catc_write_mem(catc, 0xfa80, &i, 4);
  		catc_read_mem(catc, 0x7a80, &i, 4);
  	  
  		switch (i) {
  		case 0x12345678:
  			catc_set_reg(catc, TxBufCount, 8);
  			catc_set_reg(catc, RxBufCount, 32);
  			dev_dbg(dev, "64k Memory
  ");
  			break;
  		default:
  			dev_warn(&intf->dev,
  				 "Couldn't detect memory size, assuming 32k
  ");
  		case 0x87654321:
  			catc_set_reg(catc, TxBufCount, 4);
  			catc_set_reg(catc, RxBufCount, 16);
  			dev_dbg(dev, "32k Memory
  ");
  			break;
  		}
  	  
  		dev_dbg(dev, "Getting MAC from SEEROM.
  ");
  	  
  		catc_get_mac(catc, netdev->dev_addr);
  		
  		dev_dbg(dev, "Setting MAC into registers.
  ");
  	  
  		for (i = 0; i < 6; i++)
  			catc_set_reg(catc, StationAddr0 - i, netdev->dev_addr[i]);
  		
  		dev_dbg(dev, "Filling the multicast list.
  ");
  	  
  		eth_broadcast_addr(broadcast);
  		catc_multicast(broadcast, catc->multicast);
  		catc_multicast(netdev->dev_addr, catc->multicast);
  		catc_write_mem(catc, 0xfa80, catc->multicast, 64);
  		
  		dev_dbg(dev, "Clearing error counters.
  ");
  		
  		for (i = 0; i < 8; i++)
  			catc_set_reg(catc, EthStats + i, 0);
  		catc->last_stats = jiffies;
  		
  		dev_dbg(dev, "Enabling.
  ");
  		
  		catc_set_reg(catc, MaxBurst, RX_MAX_BURST);
  		catc_set_reg(catc, OpModes, OpTxMerge | OpRxMerge | OpLenInclude | Op3MemWaits);
  		catc_set_reg(catc, LEDCtrl, LEDLink);
  		catc_set_reg(catc, RxUnit, RxEnable | RxPolarity | RxMultiCast);
  	} else {
  		dev_dbg(dev, "Performing reset
  ");
  		catc_reset(catc);
  		catc_get_mac(catc, netdev->dev_addr);
  		
  		dev_dbg(dev, "Setting RX Mode
  ");
  		catc->rxmode[0] = RxEnable | RxPolarity | RxMultiCast;
  		catc->rxmode[1] = 0;
  		f5u011_rxmode(catc, catc->rxmode);
  	}
  	dev_dbg(dev, "Init done.
  ");
  	printk(KERN_INFO "%s: %s USB Ethernet at usb-%s-%s, %pM.
  ",
  	       netdev->name, (catc->is_f5u011) ? "Belkin F5U011" : "CATC EL1210A NetMate",
  	       usbdev->bus->bus_name, usbdev->devpath, netdev->dev_addr);
  	usb_set_intfdata(intf, catc);
  
  	SET_NETDEV_DEV(netdev, &intf->dev);
  	if (register_netdev(netdev) != 0) {
  		usb_set_intfdata(intf, NULL);
  		usb_free_urb(catc->ctrl_urb);
  		usb_free_urb(catc->tx_urb);
  		usb_free_urb(catc->rx_urb);
  		usb_free_urb(catc->irq_urb);
  		free_netdev(netdev);
  		return -EIO;
  	}
  	return 0;
  }
  
  static void catc_disconnect(struct usb_interface *intf)
  {
  	struct catc *catc = usb_get_intfdata(intf);
  
  	usb_set_intfdata(intf, NULL);
  	if (catc) {
  		unregister_netdev(catc->netdev);
  		usb_free_urb(catc->ctrl_urb);
  		usb_free_urb(catc->tx_urb);
  		usb_free_urb(catc->rx_urb);
  		usb_free_urb(catc->irq_urb);
  		free_netdev(catc->netdev);
  	}
  }
  
  /*
   * Module functions and tables.
   */
  
  static struct usb_device_id catc_id_table [] = {
  	{ USB_DEVICE(0x0423, 0xa) },	/* CATC Netmate, Belkin F5U011 */
  	{ USB_DEVICE(0x0423, 0xc) },	/* CATC Netmate II, Belkin F5U111 */
  	{ USB_DEVICE(0x08d1, 0x1) },	/* smartBridges smartNIC */
  	{ }
  };
  
  MODULE_DEVICE_TABLE(usb, catc_id_table);
  
  static struct usb_driver catc_driver = {
  	.name =		driver_name,
  	.probe =	catc_probe,
  	.disconnect =	catc_disconnect,
  	.id_table =	catc_id_table,
  	.disable_hub_initiated_lpm = 1,
  };
  
  module_usb_driver(catc_driver);