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catc.c

/*
 *  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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 * 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/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.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 <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;

      struct net_device_stats stats;
      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;

      if (!catc->is_f5u011) {
            clear_bit(RX_RUNNING, &catc->flags);
            pkt_offset = 2;
      }

      if (urb->status) {
            dbg("rx_done, status %d, length %d", urb->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->stats.rx_length_errors++;
                        catc->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->stats.rx_packets++;
            catc->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);

      catc->netdev->last_rx = jiffies;

      if (catc->is_f5u011) {
            if (atomic_read(&catc->recq_sz)) {
                  int status;
                  atomic_dec(&catc->recq_sz);
                  dbg("getting extra packet");
                  urb->dev = catc->usbdev;
                  if ((status = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
                        dbg("submit(rx_urb) status %d", status);
                  }
            } 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;
      unsigned int hasdata = 0, linksts = LinkNoChange;

      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 (urb->status) {
      case 0:                 /* success */
            break;
      case -ECONNRESET: /* unlink */
      case -ENOENT:
      case -ESHUTDOWN:
            return;
      /* -EPIPE:  should clear the halt */
      default:          /* error */
            dbg("irq_done, status %d, data %02x %02x.", urb->status, data[0], data[1]);
            goto resubmit;
      }

      if (linksts == LinkGood) {
            netif_carrier_on(catc->netdev);
            dbg("link ok");
      }

      if (linksts == LinkBad) {
            netif_carrier_off(catc->netdev);
            dbg("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 ((status = usb_submit_urb(catc->rx_urb, GFP_ATOMIC)) < 0) {
                        err("submit(rx_urb) status %d", status);
                  }
            } 
      }
resubmit:
      status = usb_submit_urb (urb, GFP_ATOMIC);
      if (status)
            err ("can't resubmit intr, %s-%s, status %d",
                        catc->usbdev->bus->bus_name,
                        catc->usbdev->devpath, status);
}

/*
 * 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)
            err("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;

      if (urb->status == -ECONNRESET) {
            dbg("Tx Reset.");
            urb->status = 0;
            catc->netdev->trans_start = jiffies;
            catc->stats.tx_errors++;
            clear_bit(TX_RUNNING, &catc->flags);
            netif_wake_queue(catc->netdev);
            return;
      }

      if (urb->status) {
            dbg("tx_done, status %d, length %d", urb->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 int catc_hard_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;
      *((u16*)tx_buf) = (catc->is_f5u011) ? cpu_to_be16((u16)skb->len) : cpu_to_le16((u16)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->stats.tx_bytes += skb->len;
            catc->stats.tx_packets++;
      }

      dev_kfree_skb(skb);

      return 0;
}

static void catc_tx_timeout(struct net_device *netdev)
{
      struct catc *catc = netdev_priv(netdev);

      warn("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_KERNEL)))
            err("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;

      if (urb->status)
            dbg("ctrl_done, status %d, len %d.", urb->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) {
            err("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->stats.collisions += data - last;
                  break;
            case TxExcessColl:
                  catc->stats.tx_aborted_errors += data - last;
                  catc->stats.tx_errors += data - last;
                  break;
            case RxFramErr:
                  catc->stats.rx_frame_errors += data - last;
                  catc->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);
}

static struct net_device_stats *catc_get_stats(struct net_device *netdev)
{
      struct catc *catc = netdev_priv(netdev);
      return &catc->stats;
}

/*
 * 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 dev_mc_list *mc;
      u8 broadcast[6];
      u8 rx = RxEnable | RxPolarity | RxMultiCast;
      int i;

      memset(broadcast, 0xff, 6);
      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 {
            for (i = 0, mc = netdev->mc_list; mc && i < netdev->mc_count; i++, mc = mc->next) {
                  u32 crc = ether_crc_le(6, mc->dmi_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;
                  dbg("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);
      strncpy(info->driver, driver_name, ETHTOOL_BUSINFO_LEN);
      strncpy(info->version, DRIVER_VERSION, ETHTOOL_BUSINFO_LEN);
      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;
      cmd->speed = 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 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) {
            err("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;
}

/*
 * USB probe, disconnect.
 */

static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
      struct usb_device *usbdev = interface_to_usbdev(intf);
      struct net_device *netdev;
      struct catc *catc;
      u8 broadcast[6];
      int i, pktsz;

      if (usb_set_interface(usbdev,
                  intf->altsetting->desc.bInterfaceNumber, 1)) {
                err("Can't set altsetting 1.");
            return -EIO;
      }

      netdev = alloc_etherdev(sizeof(struct catc));
      if (!netdev)
            return -ENOMEM;

      catc = netdev_priv(netdev);

      netdev->open = catc_open;
      netdev->hard_start_xmit = catc_hard_start_xmit;
      netdev->stop = catc_stop;
      netdev->get_stats = catc_get_stats;
      netdev->tx_timeout = catc_tx_timeout;
      netdev->watchdog_timeo = TX_TIMEOUT;
      netdev->set_multicast_list = catc_set_multicast_list;
      SET_ETHTOOL_OPS(netdev, &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)) {
            err("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) {
            dbg("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) {
            dbg("Checking memory size\n");

            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);
                  dbg("64k Memory\n");
                  break;
            default:
                  warn("Couldn't detect memory size, assuming 32k");
            case 0x87654321:
                  catc_set_reg(catc, TxBufCount, 4);
                  catc_set_reg(catc, RxBufCount, 16);
                  dbg("32k Memory\n");
                  break;
            }
        
            dbg("Getting MAC from SEEROM.");
        
            catc_get_mac(catc, netdev->dev_addr);
            
            dbg("Setting MAC into registers.");
        
            for (i = 0; i < 6; i++)
                  catc_set_reg(catc, StationAddr0 - i, netdev->dev_addr[i]);
            
            dbg("Filling the multicast list.");
        
            memset(broadcast, 0xff, 6);
            catc_multicast(broadcast, catc->multicast);
            catc_multicast(netdev->dev_addr, catc->multicast);
            catc_write_mem(catc, 0xfa80, catc->multicast, 64);
            
            dbg("Clearing error counters.");
            
            for (i = 0; i < 8; i++)
                  catc_set_reg(catc, EthStats + i, 0);
            catc->last_stats = jiffies;
            
            dbg("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 {
            dbg("Performing reset\n");
            catc_reset(catc);
            catc_get_mac(catc, netdev->dev_addr);
            
            dbg("Setting RX Mode");
            catc->rxmode[0] = RxEnable | RxPolarity | RxMultiCast;
            catc->rxmode[1] = 0;
            f5u011_rxmode(catc, catc->rxmode);
      }
      dbg("Init done.");
      printk(KERN_INFO "%s: %s USB Ethernet at usb-%s-%s, ",
             netdev->name, (catc->is_f5u011) ? "Belkin F5U011" : "CATC EL1210A NetMate",
             usbdev->bus->bus_name, usbdev->devpath);
      for (i = 0; i < 5; i++) printk("%2.2x:", netdev->dev_addr[i]);
      printk("%2.2x.\n", netdev->dev_addr[i]);
      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,
};

static int __init catc_init(void)
{
      int result = usb_register(&catc_driver);
      if (result == 0)
            info(DRIVER_VERSION " " DRIVER_DESC);
      return result;
}

static void __exit catc_exit(void)
{
      usb_deregister(&catc_driver);
}

module_init(catc_init);
module_exit(catc_exit);

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