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pegasus.c

/*
 *  Copyright (c) 1999-2005 Petko Manolov (petkan@users.sourceforge.net)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *    ChangeLog:
 *          ....  Most of the time spent on reading sources & docs.
 *          v0.2.x      First official release for the Linux kernel.
 *          v0.3.0      Beutified and structured, some bugs fixed.
 *          v0.3.x      URBifying bulk requests and bugfixing. First relatively
 *                stable release. Still can touch device's registers only
 *                from top-halves.
 *          v0.4.0      Control messages remained unurbified are now URBs.
 *                Now we can touch the HW at any time.
 *          v0.4.9      Control urbs again use process context to wait. Argh...
 *                Some long standing bugs (enable_net_traffic) fixed.
 *                Also nasty trick about resubmiting control urb from
 *                interrupt context used. Please let me know how it
 *                behaves. Pegasus II support added since this version.
 *                TODO: suppressing HCD warnings spewage on disconnect.
 *          v0.4.13     Ethernet address is now set at probe(), not at open()
 *                time as this seems to break dhcpd. 
 *          v0.5.0      branch to 2.5.x kernels
 *          v0.5.1      ethtool support added
 *          v0.5.5      rx socket buffers are in a pool and the their allocation
 *                is out of the interrupt routine.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/module.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include "pegasus.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.6.14 (2006/09/27)"
#define DRIVER_AUTHOR "Petko Manolov <petkan@users.sourceforge.net>"
#define DRIVER_DESC "Pegasus/Pegasus II USB Ethernet driver"

static const char driver_name[] = "pegasus";

#undef      PEGASUS_WRITE_EEPROM
#define     BMSR_MEDIA  (BMSR_10HALF | BMSR_10FULL | BMSR_100HALF | \
                  BMSR_100FULL | BMSR_ANEGCAPABLE)

static int loopback = 0;
static int mii_mode = 0;
static char *devid=NULL;

static struct usb_eth_dev usb_dev_id[] = {
#define     PEGASUS_DEV(pn, vid, pid, flags)    \
      {.name = pn, .vendor = vid, .device = pid, .private = flags},
#include "pegasus.h"
#undef      PEGASUS_DEV
      {NULL, 0, 0, 0},
      {NULL, 0, 0, 0}
};

static struct usb_device_id pegasus_ids[] = {
#define     PEGASUS_DEV(pn, vid, pid, flags) \
      {.match_flags = USB_DEVICE_ID_MATCH_DEVICE, .idVendor = vid, .idProduct = pid},
#include "pegasus.h"
#undef      PEGASUS_DEV
      {},
      {}
};

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(loopback, bool, 0);
module_param(mii_mode, bool, 0);
module_param(devid, charp, 0);
MODULE_PARM_DESC(loopback, "Enable MAC loopback mode (bit 0)");
MODULE_PARM_DESC(mii_mode, "Enable HomePNA mode (bit 0),default=MII mode = 0");
MODULE_PARM_DESC(devid, "The format is: 'DEV_name:VendorID:DeviceID:Flags'");

/* use ethtool to change the level for any given device */
static int msg_level = -1;
module_param (msg_level, int, 0);
MODULE_PARM_DESC (msg_level, "Override default message level");

MODULE_DEVICE_TABLE(usb, pegasus_ids);

static int update_eth_regs_async(pegasus_t *);
/* Aargh!!! I _really_ hate such tweaks */
static void ctrl_callback(struct urb *urb)
{
      pegasus_t *pegasus = urb->context;

      if (!pegasus)
            return;

      switch (urb->status) {
      case 0:
            if (pegasus->flags & ETH_REGS_CHANGE) {
                  pegasus->flags &= ~ETH_REGS_CHANGE;
                  pegasus->flags |= ETH_REGS_CHANGED;
                  update_eth_regs_async(pegasus);
                  return;
            }
            break;
      case -EINPROGRESS:
            return;
      case -ENOENT:
            break;
      default:
            if (netif_msg_drv(pegasus))
                  dev_dbg(&pegasus->intf->dev, "%s, status %d\n",
                        __FUNCTION__, urb->status);
      }
      pegasus->flags &= ~ETH_REGS_CHANGED;
      wake_up(&pegasus->ctrl_wait);
}

static int get_registers(pegasus_t * pegasus, __u16 indx, __u16 size,
                   void *data)
{
      int ret;
      char *buffer;
      DECLARE_WAITQUEUE(wait, current);

      buffer = kmalloc(size, GFP_KERNEL);
      if (!buffer) {
            if (netif_msg_drv(pegasus))
                  dev_warn(&pegasus->intf->dev, "out of memory in %s\n",
                              __FUNCTION__);
            return -ENOMEM;
      }
      add_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_UNINTERRUPTIBLE);
      while (pegasus->flags & ETH_REGS_CHANGED)
            schedule();
      remove_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_RUNNING);

      pegasus->dr.bRequestType = PEGASUS_REQT_READ;
      pegasus->dr.bRequest = PEGASUS_REQ_GET_REGS;
      pegasus->dr.wValue = cpu_to_le16(0);
      pegasus->dr.wIndex = cpu_to_le16p(&indx);
      pegasus->dr.wLength = cpu_to_le16p(&size);
      pegasus->ctrl_urb->transfer_buffer_length = size;

      usb_fill_control_urb(pegasus->ctrl_urb, pegasus->usb,
                       usb_rcvctrlpipe(pegasus->usb, 0),
                       (char *) &pegasus->dr,
                       buffer, size, ctrl_callback, pegasus);

      add_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_UNINTERRUPTIBLE);

      /* using ATOMIC, we'd never wake up if we slept */
      if ((ret = usb_submit_urb(pegasus->ctrl_urb, GFP_ATOMIC))) {
            set_current_state(TASK_RUNNING);
            if (ret == -ENODEV)
                  netif_device_detach(pegasus->net);
            if (netif_msg_drv(pegasus))
                  dev_err(&pegasus->intf->dev, "%s, status %d\n",
                              __FUNCTION__, ret);
            goto out;
      }

      schedule();
out:
      remove_wait_queue(&pegasus->ctrl_wait, &wait);
      memcpy(data, buffer, size);
      kfree(buffer);

      return ret;
}

static int set_registers(pegasus_t * pegasus, __u16 indx, __u16 size,
                   void *data)
{
      int ret;
      char *buffer;
      DECLARE_WAITQUEUE(wait, current);

      buffer = kmalloc(size, GFP_KERNEL);
      if (!buffer) {
            if (netif_msg_drv(pegasus))
                  dev_warn(&pegasus->intf->dev, "out of memory in %s\n",
                              __FUNCTION__);
            return -ENOMEM;
      }
      memcpy(buffer, data, size);

      add_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_UNINTERRUPTIBLE);
      while (pegasus->flags & ETH_REGS_CHANGED)
            schedule();
      remove_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_RUNNING);

      pegasus->dr.bRequestType = PEGASUS_REQT_WRITE;
      pegasus->dr.bRequest = PEGASUS_REQ_SET_REGS;
      pegasus->dr.wValue = cpu_to_le16(0);
      pegasus->dr.wIndex = cpu_to_le16p(&indx);
      pegasus->dr.wLength = cpu_to_le16p(&size);
      pegasus->ctrl_urb->transfer_buffer_length = size;

      usb_fill_control_urb(pegasus->ctrl_urb, pegasus->usb,
                       usb_sndctrlpipe(pegasus->usb, 0),
                       (char *) &pegasus->dr,
                       buffer, size, ctrl_callback, pegasus);

      add_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_UNINTERRUPTIBLE);

      if ((ret = usb_submit_urb(pegasus->ctrl_urb, GFP_ATOMIC))) {
            if (ret == -ENODEV)
                  netif_device_detach(pegasus->net);
            if (netif_msg_drv(pegasus))
                  dev_err(&pegasus->intf->dev, "%s, status %d\n",
                              __FUNCTION__, ret);
            goto out;
      }

      schedule();
out:
      remove_wait_queue(&pegasus->ctrl_wait, &wait);
      kfree(buffer);

      return ret;
}

static int set_register(pegasus_t * pegasus, __u16 indx, __u8 data)
{
      int ret;
      char *tmp;
      DECLARE_WAITQUEUE(wait, current);

      tmp = kmalloc(1, GFP_KERNEL);
      if (!tmp) {
            if (netif_msg_drv(pegasus))
                  dev_warn(&pegasus->intf->dev, "out of memory in %s\n",
                              __FUNCTION__);
            return -ENOMEM;
      }
      memcpy(tmp, &data, 1);
      add_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_UNINTERRUPTIBLE);
      while (pegasus->flags & ETH_REGS_CHANGED)
            schedule();
      remove_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_RUNNING);

      pegasus->dr.bRequestType = PEGASUS_REQT_WRITE;
      pegasus->dr.bRequest = PEGASUS_REQ_SET_REG;
      pegasus->dr.wValue = cpu_to_le16(data);
      pegasus->dr.wIndex = cpu_to_le16p(&indx);
      pegasus->dr.wLength = cpu_to_le16(1);
      pegasus->ctrl_urb->transfer_buffer_length = 1;

      usb_fill_control_urb(pegasus->ctrl_urb, pegasus->usb,
                       usb_sndctrlpipe(pegasus->usb, 0),
                       (char *) &pegasus->dr,
                       tmp, 1, ctrl_callback, pegasus);

      add_wait_queue(&pegasus->ctrl_wait, &wait);
      set_current_state(TASK_UNINTERRUPTIBLE);

      if ((ret = usb_submit_urb(pegasus->ctrl_urb, GFP_ATOMIC))) {
            if (ret == -ENODEV)
                  netif_device_detach(pegasus->net);
            if (netif_msg_drv(pegasus))
                  dev_err(&pegasus->intf->dev, "%s, status %d\n",
                              __FUNCTION__, ret);
            goto out;
      }

      schedule();
out:
      remove_wait_queue(&pegasus->ctrl_wait, &wait);
      kfree(tmp);

      return ret;
}

static int update_eth_regs_async(pegasus_t * pegasus)
{
      int ret;

      pegasus->dr.bRequestType = PEGASUS_REQT_WRITE;
      pegasus->dr.bRequest = PEGASUS_REQ_SET_REGS;
      pegasus->dr.wValue = 0;
      pegasus->dr.wIndex = cpu_to_le16(EthCtrl0);
      pegasus->dr.wLength = cpu_to_le16(3);
      pegasus->ctrl_urb->transfer_buffer_length = 3;

      usb_fill_control_urb(pegasus->ctrl_urb, pegasus->usb,
                       usb_sndctrlpipe(pegasus->usb, 0),
                       (char *) &pegasus->dr,
                       pegasus->eth_regs, 3, ctrl_callback, pegasus);

      if ((ret = usb_submit_urb(pegasus->ctrl_urb, GFP_ATOMIC))) {
            if (ret == -ENODEV)
                  netif_device_detach(pegasus->net);
            if (netif_msg_drv(pegasus))
                  dev_err(&pegasus->intf->dev, "%s, status %d\n",
                              __FUNCTION__, ret);
      }

      return ret;
}

/* Returns 0 on success, error on failure */
static int read_mii_word(pegasus_t * pegasus, __u8 phy, __u8 indx, __u16 * regd)
{
      int i;
      __u8 data[4] = { phy, 0, 0, indx };
      __le16 regdi;
      int ret;

      set_register(pegasus, PhyCtrl, 0);
      set_registers(pegasus, PhyAddr, sizeof (data), data);
      set_register(pegasus, PhyCtrl, (indx | PHY_READ));
      for (i = 0; i < REG_TIMEOUT; i++) {
            ret = get_registers(pegasus, PhyCtrl, 1, data);
            if (ret == -ESHUTDOWN)
                  goto fail;
            if (data[0] & PHY_DONE)
                  break;
      }
      if (i < REG_TIMEOUT) {
            ret = get_registers(pegasus, PhyData, 2, &regdi);
            *regd = le16_to_cpu(regdi);
            return ret;
      }
fail:
      if (netif_msg_drv(pegasus))
            dev_warn(&pegasus->intf->dev, "%s failed\n", __FUNCTION__);

      return ret;
}

static int mdio_read(struct net_device *dev, int phy_id, int loc)
{
      pegasus_t *pegasus = (pegasus_t *) netdev_priv(dev);
      u16 res;

      read_mii_word(pegasus, phy_id, loc, &res);
      return (int)res;
}

static int write_mii_word(pegasus_t * pegasus, __u8 phy, __u8 indx, __u16 regd)
{
      int i;
      __u8 data[4] = { phy, 0, 0, indx };
      int ret;

      data[1] = (u8) regd;
      data[2] = (u8) (regd >> 8);
      set_register(pegasus, PhyCtrl, 0);
      set_registers(pegasus, PhyAddr, sizeof(data), data);
      set_register(pegasus, PhyCtrl, (indx | PHY_WRITE));
      for (i = 0; i < REG_TIMEOUT; i++) {
            ret = get_registers(pegasus, PhyCtrl, 1, data);
            if (ret == -ESHUTDOWN)
                  goto fail;
            if (data[0] & PHY_DONE)
                  break;
      }
      if (i < REG_TIMEOUT)
            return ret;

fail:
      if (netif_msg_drv(pegasus))
            dev_warn(&pegasus->intf->dev, "%s failed\n", __FUNCTION__);
      return -ETIMEDOUT;
}

static void mdio_write(struct net_device *dev, int phy_id, int loc, int val)
{
      pegasus_t *pegasus = (pegasus_t *) netdev_priv(dev);

      write_mii_word(pegasus, phy_id, loc, val);
}

static int read_eprom_word(pegasus_t * pegasus, __u8 index, __u16 * retdata)
{
      int i;
      __u8 tmp;
      __le16 retdatai;
      int ret;

      set_register(pegasus, EpromCtrl, 0);
      set_register(pegasus, EpromOffset, index);
      set_register(pegasus, EpromCtrl, EPROM_READ);

      for (i = 0; i < REG_TIMEOUT; i++) {
            ret = get_registers(pegasus, EpromCtrl, 1, &tmp);
            if (tmp & EPROM_DONE)
                  break;
            if (ret == -ESHUTDOWN)
                  goto fail;
      }
      if (i < REG_TIMEOUT) {
            ret = get_registers(pegasus, EpromData, 2, &retdatai);
            *retdata = le16_to_cpu(retdatai);
            return ret;
      }

fail:
      if (netif_msg_drv(pegasus))
            dev_warn(&pegasus->intf->dev, "%s failed\n", __FUNCTION__);
      return -ETIMEDOUT;
}

#ifdef      PEGASUS_WRITE_EEPROM
static inline void enable_eprom_write(pegasus_t * pegasus)
{
      __u8 tmp;
      int ret;

      get_registers(pegasus, EthCtrl2, 1, &tmp);
      set_register(pegasus, EthCtrl2, tmp | EPROM_WR_ENABLE);
}

static inline void disable_eprom_write(pegasus_t * pegasus)
{
      __u8 tmp;
      int ret;

      get_registers(pegasus, EthCtrl2, 1, &tmp);
      set_register(pegasus, EpromCtrl, 0);
      set_register(pegasus, EthCtrl2, tmp & ~EPROM_WR_ENABLE);
}

static int write_eprom_word(pegasus_t * pegasus, __u8 index, __u16 data)
{
      int i;
      __u8 tmp, d[4] = { 0x3f, 0, 0, EPROM_WRITE };
      int ret;

      set_registers(pegasus, EpromOffset, 4, d);
      enable_eprom_write(pegasus);
      set_register(pegasus, EpromOffset, index);
      set_registers(pegasus, EpromData, 2, &data);
      set_register(pegasus, EpromCtrl, EPROM_WRITE);

      for (i = 0; i < REG_TIMEOUT; i++) {
            ret = get_registers(pegasus, EpromCtrl, 1, &tmp);
            if (ret == -ESHUTDOWN)
                  goto fail;
            if (tmp & EPROM_DONE)
                  break;
      }
      disable_eprom_write(pegasus);
      if (i < REG_TIMEOUT)
            return ret;
fail:
      if (netif_msg_drv(pegasus))
            dev_warn(&pegasus->intf->dev, "%s failed\n", __FUNCTION__);
      return -ETIMEDOUT;
}
#endif                        /* PEGASUS_WRITE_EEPROM */

static inline void get_node_id(pegasus_t * pegasus, __u8 * id)
{
      int i;
      __u16 w16;

      for (i = 0; i < 3; i++) {
            read_eprom_word(pegasus, i, &w16);
            ((__le16 *) id)[i] = cpu_to_le16p(&w16);
      }
}

static void set_ethernet_addr(pegasus_t * pegasus)
{
      __u8 node_id[6];

      if (pegasus->features & PEGASUS_II) {
            get_registers(pegasus, 0x10, sizeof(node_id), node_id);
      } else {
            get_node_id(pegasus, node_id);
            set_registers(pegasus, EthID, sizeof (node_id), node_id);
      }
      memcpy(pegasus->net->dev_addr, node_id, sizeof (node_id));
}

static inline int reset_mac(pegasus_t * pegasus)
{
      __u8 data = 0x8;
      int i;

      set_register(pegasus, EthCtrl1, data);
      for (i = 0; i < REG_TIMEOUT; i++) {
            get_registers(pegasus, EthCtrl1, 1, &data);
            if (~data & 0x08) {
                  if (loopback & 1)
                        break;
                  if (mii_mode && (pegasus->features & HAS_HOME_PNA))
                        set_register(pegasus, Gpio1, 0x34);
                  else
                        set_register(pegasus, Gpio1, 0x26);
                  set_register(pegasus, Gpio0, pegasus->features);
                  set_register(pegasus, Gpio0, DEFAULT_GPIO_SET);
                  break;
            }
      }
      if (i == REG_TIMEOUT)
            return -ETIMEDOUT;

      if (usb_dev_id[pegasus->dev_index].vendor == VENDOR_LINKSYS ||
          usb_dev_id[pegasus->dev_index].vendor == VENDOR_DLINK) {
            set_register(pegasus, Gpio0, 0x24);
            set_register(pegasus, Gpio0, 0x26);
      }
      if (usb_dev_id[pegasus->dev_index].vendor == VENDOR_ELCON) {
            __u16 auxmode;
            read_mii_word(pegasus, 3, 0x1b, &auxmode);
            write_mii_word(pegasus, 3, 0x1b, auxmode | 4);
      }

      return 0;
}

static int enable_net_traffic(struct net_device *dev, struct usb_device *usb)
{
      __u16 linkpart;
      __u8 data[4];
      pegasus_t *pegasus = netdev_priv(dev);
      int ret;

      read_mii_word(pegasus, pegasus->phy, MII_LPA, &linkpart);
      data[0] = 0xc9;
      data[1] = 0;
      if (linkpart & (ADVERTISE_100FULL | ADVERTISE_10FULL))
            data[1] |= 0x20;  /* set full duplex */
      if (linkpart & (ADVERTISE_100FULL | ADVERTISE_100HALF))
            data[1] |= 0x10;  /* set 100 Mbps */
      if (mii_mode)
            data[1] = 0;
      data[2] = (loopback & 1) ? 0x09 : 0x01;

      memcpy(pegasus->eth_regs, data, sizeof (data));
      ret = set_registers(pegasus, EthCtrl0, 3, data);

      if (usb_dev_id[pegasus->dev_index].vendor == VENDOR_LINKSYS ||
          usb_dev_id[pegasus->dev_index].vendor == VENDOR_LINKSYS2 ||
          usb_dev_id[pegasus->dev_index].vendor == VENDOR_DLINK) {
            u16 auxmode;
            read_mii_word(pegasus, 0, 0x1b, &auxmode);
            write_mii_word(pegasus, 0, 0x1b, auxmode | 4);
      }

      return ret;
}

static void fill_skb_pool(pegasus_t * pegasus)
{
      int i;

      for (i = 0; i < RX_SKBS; i++) {
            if (pegasus->rx_pool[i])
                  continue;
            pegasus->rx_pool[i] = dev_alloc_skb(PEGASUS_MTU + 2);
            /*
             ** we give up if the allocation fail. the tasklet will be
             ** rescheduled again anyway...
             */
            if (pegasus->rx_pool[i] == NULL)
                  return;
            skb_reserve(pegasus->rx_pool[i], 2);
      }
}

static void free_skb_pool(pegasus_t * pegasus)
{
      int i;

      for (i = 0; i < RX_SKBS; i++) {
            if (pegasus->rx_pool[i]) {
                  dev_kfree_skb(pegasus->rx_pool[i]);
                  pegasus->rx_pool[i] = NULL;
            }
      }
}

static inline struct sk_buff *pull_skb(pegasus_t * pegasus)
{
      int i;
      struct sk_buff *skb;

      for (i = 0; i < RX_SKBS; i++) {
            if (likely(pegasus->rx_pool[i] != NULL)) {
                  skb = pegasus->rx_pool[i];
                  pegasus->rx_pool[i] = NULL;
                  return skb;
            }
      }
      return NULL;
}

static void read_bulk_callback(struct urb *urb)
{
      pegasus_t *pegasus = urb->context;
      struct net_device *net;
      int rx_status, count = urb->actual_length;
      u8 *buf = urb->transfer_buffer;
      __u16 pkt_len;

      if (!pegasus)
            return;

      net = pegasus->net;
      if (!netif_device_present(net) || !netif_running(net))
            return;

      switch (urb->status) {
      case 0:
            break;
      case -ETIME:
            if (netif_msg_rx_err(pegasus))
                  pr_debug("%s: reset MAC\n", net->name);
            pegasus->flags &= ~PEGASUS_RX_BUSY;
            break;
      case -EPIPE:            /* stall, or disconnect from TT */
            /* FIXME schedule work to clear the halt */
            if (netif_msg_rx_err(pegasus))
                  printk(KERN_WARNING "%s: no rx stall recovery\n",
                              net->name);
            return;
      case -ENOENT:
      case -ECONNRESET:
      case -ESHUTDOWN:
            if (netif_msg_ifdown(pegasus))
                  pr_debug("%s: rx unlink, %d\n", net->name, urb->status);
            return;
      default:
            if (netif_msg_rx_err(pegasus))
                  pr_debug("%s: RX status %d\n", net->name, urb->status);
            goto goon;
      }

      if (!count || count < 4)
            goto goon;

      rx_status = buf[count - 2];
      if (rx_status & 0x1e) {
            if (netif_msg_rx_err(pegasus))
                  pr_debug("%s: RX packet error %x\n",
                              net->name, rx_status);
            pegasus->stats.rx_errors++;
            if (rx_status & 0x06)   // long or runt
                  pegasus->stats.rx_length_errors++;
            if (rx_status & 0x08)
                  pegasus->stats.rx_crc_errors++;
            if (rx_status & 0x10)   // extra bits
                  pegasus->stats.rx_frame_errors++;
            goto goon;
      }
      if (pegasus->chip == 0x8513) {
            pkt_len = le32_to_cpu(*(__le32 *)urb->transfer_buffer);
            pkt_len &= 0x0fff;
            pegasus->rx_skb->data += 2;
      } else {
            pkt_len = buf[count - 3] << 8;
            pkt_len += buf[count - 4];
            pkt_len &= 0xfff;
            pkt_len -= 8;
      }

      /*
       * If the packet is unreasonably long, quietly drop it rather than
       * kernel panicing by calling skb_put.
       */
      if (pkt_len > PEGASUS_MTU)
            goto goon;

      /*
       * at this point we are sure pegasus->rx_skb != NULL
       * so we go ahead and pass up the packet.
       */
      skb_put(pegasus->rx_skb, pkt_len);
      pegasus->rx_skb->protocol = eth_type_trans(pegasus->rx_skb, net);
      netif_rx(pegasus->rx_skb);
      pegasus->stats.rx_packets++;
      pegasus->stats.rx_bytes += pkt_len;

      if (pegasus->flags & PEGASUS_UNPLUG)
            return;

      spin_lock(&pegasus->rx_pool_lock);
      pegasus->rx_skb = pull_skb(pegasus);
      spin_unlock(&pegasus->rx_pool_lock);

      if (pegasus->rx_skb == NULL)
            goto tl_sched;
goon:
      usb_fill_bulk_urb(pegasus->rx_urb, pegasus->usb,
                    usb_rcvbulkpipe(pegasus->usb, 1),
                    pegasus->rx_skb->data, PEGASUS_MTU + 8,
                    read_bulk_callback, pegasus);
      rx_status = usb_submit_urb(pegasus->rx_urb, GFP_ATOMIC);
      if (rx_status == -ENODEV)
            netif_device_detach(pegasus->net);
      else if (rx_status) {
            pegasus->flags |= PEGASUS_RX_URB_FAIL;
            goto tl_sched;
      } else {
            pegasus->flags &= ~PEGASUS_RX_URB_FAIL;
      }

      return;

tl_sched:
      tasklet_schedule(&pegasus->rx_tl);
}

static void rx_fixup(unsigned long data)
{
      pegasus_t *pegasus;
      unsigned long flags;
      int status;

      pegasus = (pegasus_t *) data;
      if (pegasus->flags & PEGASUS_UNPLUG)
            return;

      spin_lock_irqsave(&pegasus->rx_pool_lock, flags);
      fill_skb_pool(pegasus);
      if (pegasus->flags & PEGASUS_RX_URB_FAIL)
            if (pegasus->rx_skb)
                  goto try_again;
      if (pegasus->rx_skb == NULL) {
            pegasus->rx_skb = pull_skb(pegasus);
      }
      if (pegasus->rx_skb == NULL) {
            if (netif_msg_rx_err(pegasus))
                  printk(KERN_WARNING "%s: low on memory\n",
                              pegasus->net->name);
            tasklet_schedule(&pegasus->rx_tl);
            goto done;
      }
      usb_fill_bulk_urb(pegasus->rx_urb, pegasus->usb,
                    usb_rcvbulkpipe(pegasus->usb, 1),
                    pegasus->rx_skb->data, PEGASUS_MTU + 8,
                    read_bulk_callback, pegasus);
try_again:
      status = usb_submit_urb(pegasus->rx_urb, GFP_ATOMIC);
      if (status == -ENODEV)
            netif_device_detach(pegasus->net);
      else if (status) {
            pegasus->flags |= PEGASUS_RX_URB_FAIL;
            tasklet_schedule(&pegasus->rx_tl);
      } else {
            pegasus->flags &= ~PEGASUS_RX_URB_FAIL;
      }
done:
      spin_unlock_irqrestore(&pegasus->rx_pool_lock, flags);
}

static void write_bulk_callback(struct urb *urb)
{
      pegasus_t *pegasus = urb->context;
      struct net_device *net;

      if (!pegasus)
            return;

      net = pegasus->net;

      if (!netif_device_present(net) || !netif_running(net))
            return;

      switch (urb->status) {
      case -EPIPE:
            /* FIXME schedule_work() to clear the tx halt */
            netif_stop_queue(net);
            if (netif_msg_tx_err(pegasus))
                  printk(KERN_WARNING "%s: no tx stall recovery\n",
                              net->name);
            return;
      case -ENOENT:
      case -ECONNRESET:
      case -ESHUTDOWN:
            if (netif_msg_ifdown(pegasus))
                  pr_debug("%s: tx unlink, %d\n", net->name, urb->status);
            return;
      default:
            if (netif_msg_tx_err(pegasus))
                  pr_info("%s: TX status %d\n", net->name, urb->status);
            /* FALL THROUGH */
      case 0:
            break;
      }

      net->trans_start = jiffies;
      netif_wake_queue(net);
}

static void intr_callback(struct urb *urb)
{
      pegasus_t *pegasus = urb->context;
      struct net_device *net;
      int status;

      if (!pegasus)
            return;
      net = pegasus->net;

      switch (urb->status) {
      case 0:
            break;
      case -ECONNRESET: /* unlink */
      case -ENOENT:
      case -ESHUTDOWN:
            return;
      default:
            /* some Pegasus-I products report LOTS of data
             * toggle errors... avoid log spamming
             */
            if (netif_msg_timer(pegasus))
                  pr_debug("%s: intr status %d\n", net->name,
                              urb->status);
      }

      if (urb->actual_length >= 6) {
            u8    * d = urb->transfer_buffer;

            /* byte 0 == tx_status1, reg 2B */
            if (d[0] & (TX_UNDERRUN|EXCESSIVE_COL
                              |LATE_COL|JABBER_TIMEOUT)) {
                  pegasus->stats.tx_errors++;
                  if (d[0] & TX_UNDERRUN)
                        pegasus->stats.tx_fifo_errors++;
                  if (d[0] & (EXCESSIVE_COL | JABBER_TIMEOUT))
                        pegasus->stats.tx_aborted_errors++;
                  if (d[0] & LATE_COL)
                        pegasus->stats.tx_window_errors++;
            }

            /* d[5].LINK_STATUS lies on some adapters.
             * d[0].NO_CARRIER kicks in only with failed TX.
             * ... so monitoring with MII may be safest.
             */

            /* bytes 3-4 == rx_lostpkt, reg 2E/2F */
            pegasus->stats.rx_missed_errors += ((d[3] & 0x7f) << 8) | d[4];
      }

      status = usb_submit_urb(urb, GFP_ATOMIC);
      if (status == -ENODEV)
            netif_device_detach(pegasus->net);
      if (status && netif_msg_timer(pegasus))
            printk(KERN_ERR "%s: can't resubmit interrupt urb, %d\n",
                        net->name, status);
}

static void pegasus_tx_timeout(struct net_device *net)
{
      pegasus_t *pegasus = netdev_priv(net);
      if (netif_msg_timer(pegasus))
            printk(KERN_WARNING "%s: tx timeout\n", net->name);
      usb_unlink_urb(pegasus->tx_urb);
      pegasus->stats.tx_errors++;
}

static int pegasus_start_xmit(struct sk_buff *skb, struct net_device *net)
{
      pegasus_t *pegasus = netdev_priv(net);
      int count = ((skb->len + 2) & 0x3f) ? skb->len + 2 : skb->len + 3;
      int res;
      __u16 l16 = skb->len;

      netif_stop_queue(net);

      ((__le16 *) pegasus->tx_buff)[0] = cpu_to_le16(l16);
      skb_copy_from_linear_data(skb, pegasus->tx_buff + 2, skb->len);
      usb_fill_bulk_urb(pegasus->tx_urb, pegasus->usb,
                    usb_sndbulkpipe(pegasus->usb, 2),
                    pegasus->tx_buff, count,
                    write_bulk_callback, pegasus);
      if ((res = usb_submit_urb(pegasus->tx_urb, GFP_ATOMIC))) {
            if (netif_msg_tx_err(pegasus))
                  printk(KERN_WARNING "%s: fail tx, %d\n",
                              net->name, res);
            switch (res) {
            case -EPIPE:            /* stall, or disconnect from TT */
                  /* cleanup should already have been scheduled */
                  break;
            case -ENODEV:           /* disconnect() upcoming */
                  netif_device_detach(pegasus->net);
                  break;
            default:
                  pegasus->stats.tx_errors++;
                  netif_start_queue(net);
            }
      } else {
            pegasus->stats.tx_packets++;
            pegasus->stats.tx_bytes += skb->len;
            net->trans_start = jiffies;
      }
      dev_kfree_skb(skb);

      return 0;
}

static struct net_device_stats *pegasus_netdev_stats(struct net_device *dev)
{
      return &((pegasus_t *) netdev_priv(dev))->stats;
}

static inline void disable_net_traffic(pegasus_t * pegasus)
{
      int tmp = 0;

      set_registers(pegasus, EthCtrl0, 2, &tmp);
}

static inline void get_interrupt_interval(pegasus_t * pegasus)
{
      __u8 data[2];

      read_eprom_word(pegasus, 4, (__u16 *) data);
      if (pegasus->usb->speed != USB_SPEED_HIGH) {
            if (data[1] < 0x80) {
                  if (netif_msg_timer(pegasus))
                        dev_info(&pegasus->intf->dev, "intr interval "
                              "changed from %ums to %ums\n",
                              data[1], 0x80);
                  data[1] = 0x80;
#ifdef PEGASUS_WRITE_EEPROM
                  write_eprom_word(pegasus, 4, *(__u16 *) data);
#endif
            }
      }
      pegasus->intr_interval = data[1];
}

static void set_carrier(struct net_device *net)
{
      pegasus_t *pegasus = netdev_priv(net);
      u16 tmp;

      if (read_mii_word(pegasus, pegasus->phy, MII_BMSR, &tmp))
            return;

      if (tmp & BMSR_LSTATUS)
            netif_carrier_on(net);
      else
            netif_carrier_off(net);
}

static void free_all_urbs(pegasus_t * pegasus)
{
      usb_free_urb(pegasus->intr_urb);
      usb_free_urb(pegasus->tx_urb);
      usb_free_urb(pegasus->rx_urb);
      usb_free_urb(pegasus->ctrl_urb);
}

static void unlink_all_urbs(pegasus_t * pegasus)
{
      usb_kill_urb(pegasus->intr_urb);
      usb_kill_urb(pegasus->tx_urb);
      usb_kill_urb(pegasus->rx_urb);
      usb_kill_urb(pegasus->ctrl_urb);
}

static int alloc_urbs(pegasus_t * pegasus)
{
      pegasus->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!pegasus->ctrl_urb) {
            return 0;
      }
      pegasus->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!pegasus->rx_urb) {
            usb_free_urb(pegasus->ctrl_urb);
            return 0;
      }
      pegasus->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!pegasus->tx_urb) {
            usb_free_urb(pegasus->rx_urb);
            usb_free_urb(pegasus->ctrl_urb);
            return 0;
      }
      pegasus->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!pegasus->intr_urb) {
            usb_free_urb(pegasus->tx_urb);
            usb_free_urb(pegasus->rx_urb);
            usb_free_urb(pegasus->ctrl_urb);
            return 0;
      }

      return 1;
}

static int pegasus_open(struct net_device *net)
{
      pegasus_t *pegasus = netdev_priv(net);
      int res;

      if (pegasus->rx_skb == NULL)
            pegasus->rx_skb = pull_skb(pegasus);
      /*
       ** Note: no point to free the pool.  it is empty :-)
       */
      if (!pegasus->rx_skb)
            return -ENOMEM;

      res = set_registers(pegasus, EthID, 6, net->dev_addr);
      
      usb_fill_bulk_urb(pegasus->rx_urb, pegasus->usb,
                    usb_rcvbulkpipe(pegasus->usb, 1),
                    pegasus->rx_skb->data, PEGASUS_MTU + 8,
                    read_bulk_callback, pegasus);
      if ((res = usb_submit_urb(pegasus->rx_urb, GFP_KERNEL))) {
            if (res == -ENODEV)
                  netif_device_detach(pegasus->net);
            if (netif_msg_ifup(pegasus))
                  pr_debug("%s: failed rx_urb, %d", net->name, res);
            goto exit;
      }

      usb_fill_int_urb(pegasus->intr_urb, pegasus->usb,
                   usb_rcvintpipe(pegasus->usb, 3),
                   pegasus->intr_buff, sizeof (pegasus->intr_buff),
                   intr_callback, pegasus, pegasus->intr_interval);
      if ((res = usb_submit_urb(pegasus->intr_urb, GFP_KERNEL))) {
            if (res == -ENODEV)
                  netif_device_detach(pegasus->net);
            if (netif_msg_ifup(pegasus))
                  pr_debug("%s: failed intr_urb, %d\n", net->name, res);
            usb_kill_urb(pegasus->rx_urb);
            goto exit;
      }
      if ((res = enable_net_traffic(net, pegasus->usb))) {
            if (netif_msg_ifup(pegasus))
                  pr_debug("%s: can't enable_net_traffic() - %d\n",
                              net->name, res);
            res = -EIO;
            usb_kill_urb(pegasus->rx_urb);
            usb_kill_urb(pegasus->intr_urb);
            free_skb_pool(pegasus);
            goto exit;
      }
      set_carrier(net);
      netif_start_queue(net);
      if (netif_msg_ifup(pegasus))
            pr_debug("%s: open\n", net->name);
      res = 0;
exit:
      return res;
}

static int pegasus_close(struct net_device *net)
{
      pegasus_t *pegasus = netdev_priv(net);

      netif_stop_queue(net);
      if (!(pegasus->flags & PEGASUS_UNPLUG))
            disable_net_traffic(pegasus);
      tasklet_kill(&pegasus->rx_tl);
      unlink_all_urbs(pegasus);

      return 0;
}

static void pegasus_get_drvinfo(struct net_device *dev,
                        struct ethtool_drvinfo *info)
{
      pegasus_t *pegasus = netdev_priv(dev);
      strncpy(info->driver, driver_name, sizeof (info->driver) - 1);
      strncpy(info->version, DRIVER_VERSION, sizeof (info->version) - 1);
      usb_make_path(pegasus->usb, info->bus_info, sizeof (info->bus_info));
}

/* also handles three patterns of some kind in hardware */
#define     WOL_SUPPORTED     (WAKE_MAGIC|WAKE_PHY)

static void
pegasus_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
      pegasus_t   *pegasus = netdev_priv(dev);

      wol->supported = WAKE_MAGIC | WAKE_PHY;
      wol->wolopts = pegasus->wolopts;
}

static int
pegasus_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
      pegasus_t   *pegasus = netdev_priv(dev);
      u8          reg78 = 0x04;
      
      if (wol->wolopts & ~WOL_SUPPORTED)
            return -EINVAL;

      if (wol->wolopts & WAKE_MAGIC)
            reg78 |= 0x80;
      if (wol->wolopts & WAKE_PHY)
            reg78 |= 0x40;
      /* FIXME this 0x10 bit still needs to get set in the chip... */
      if (wol->wolopts)
            pegasus->eth_regs[0] |= 0x10;
      else
            pegasus->eth_regs[0] &= ~0x10;
      pegasus->wolopts = wol->wolopts;
      return set_register(pegasus, WakeupControl, reg78);
}

static inline void pegasus_reset_wol(struct net_device *dev)
{
      struct ethtool_wolinfo wol;
      
      memset(&wol, 0, sizeof wol);
      (void) pegasus_set_wol(dev, &wol);
}

static int
pegasus_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
      pegasus_t *pegasus;

      if (in_atomic())
            return 0;

      pegasus = netdev_priv(dev);
      mii_ethtool_gset(&pegasus->mii, ecmd);

      return 0;
}

static int
pegasus_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
      pegasus_t *pegasus = netdev_priv(dev);
      return mii_ethtool_sset(&pegasus->mii, ecmd);
}

static int pegasus_nway_reset(struct net_device *dev)
{
      pegasus_t *pegasus = netdev_priv(dev);
      return mii_nway_restart(&pegasus->mii);
}

static u32 pegasus_get_link(struct net_device *dev)
{
      pegasus_t *pegasus = netdev_priv(dev);
      return mii_link_ok(&pegasus->mii);
}

static u32 pegasus_get_msglevel(struct net_device *dev)
{
      pegasus_t *pegasus = netdev_priv(dev);
      return pegasus->msg_enable;
}

static void pegasus_set_msglevel(struct net_device *dev, u32 v)
{
      pegasus_t *pegasus = netdev_priv(dev);
      pegasus->msg_enable = v;
}

static struct ethtool_ops ops = {
      .get_drvinfo = pegasus_get_drvinfo,
      .get_settings = pegasus_get_settings,
      .set_settings = pegasus_set_settings,
      .nway_reset = pegasus_nway_reset,
      .get_link = pegasus_get_link,
      .get_msglevel = pegasus_get_msglevel,
      .set_msglevel = pegasus_set_msglevel,
      .get_wol = pegasus_get_wol,
      .set_wol = pegasus_set_wol,
};

static int pegasus_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
{
      __u16 *data = (__u16 *) & rq->ifr_ifru;
      pegasus_t *pegasus = netdev_priv(net);
      int res;

      switch (cmd) {
      case SIOCDEVPRIVATE:
            data[0] = pegasus->phy;
      case SIOCDEVPRIVATE + 1:
            read_mii_word(pegasus, data[0], data[1] & 0x1f, &data[3]);
            res = 0;
            break;
      case SIOCDEVPRIVATE + 2:
            if (!capable(CAP_NET_ADMIN))
                  return -EPERM;
            write_mii_word(pegasus, pegasus->phy, data[1] & 0x1f, data[2]);
            res = 0;
            break;
      default:
            res = -EOPNOTSUPP;
      }
      return res;
}

static void pegasus_set_multicast(struct net_device *net)
{
      pegasus_t *pegasus = netdev_priv(net);

      if (net->flags & IFF_PROMISC) {
            pegasus->eth_regs[EthCtrl2] |= RX_PROMISCUOUS;
            if (netif_msg_link(pegasus))
                  pr_info("%s: Promiscuous mode enabled.\n", net->name);
      } else if (net->mc_count ||
               (net->flags & IFF_ALLMULTI)) {
            pegasus->eth_regs[EthCtrl0] |= RX_MULTICAST;
            pegasus->eth_regs[EthCtrl2] &= ~RX_PROMISCUOUS;
            if (netif_msg_link(pegasus))
                  pr_info("%s: set allmulti\n", net->name);
      } else {
            pegasus->eth_regs[EthCtrl0] &= ~RX_MULTICAST;
            pegasus->eth_regs[EthCtrl2] &= ~RX_PROMISCUOUS;
      }

      pegasus->flags |= ETH_REGS_CHANGE;
      ctrl_callback(pegasus->ctrl_urb);
}

static __u8 mii_phy_probe(pegasus_t * pegasus)
{
      int i;
      __u16 tmp;

      for (i = 0; i < 32; i++) {
            read_mii_word(pegasus, i, MII_BMSR, &tmp);
            if (tmp == 0 || tmp == 0xffff || (tmp & BMSR_MEDIA) == 0)
                  continue;
            else
                  return i;
      }

      return 0xff;
}

static inline void setup_pegasus_II(pegasus_t * pegasus)
{
      __u8 data = 0xa5;
      
      set_register(pegasus, Reg1d, 0);
      set_register(pegasus, Reg7b, 1);
      mdelay(100);
      if ((pegasus->features & HAS_HOME_PNA) && mii_mode)
            set_register(pegasus, Reg7b, 0);
      else
            set_register(pegasus, Reg7b, 2);

      set_register(pegasus, 0x83, data);
      get_registers(pegasus, 0x83, 1, &data);

      if (data == 0xa5) {
            pegasus->chip = 0x8513;
      } else {
            pegasus->chip = 0;
      }

      set_register(pegasus, 0x80, 0xc0);
      set_register(pegasus, 0x83, 0xff);
      set_register(pegasus, 0x84, 0x01);
      
      if (pegasus->features & HAS_HOME_PNA && mii_mode)
            set_register(pegasus, Reg81, 6);
      else
            set_register(pegasus, Reg81, 2);
}


static struct workqueue_struct *pegasus_workqueue = NULL;
#define CARRIER_CHECK_DELAY (2 * HZ)

static void check_carrier(struct work_struct *work)
{
      pegasus_t *pegasus = container_of(work, pegasus_t, carrier_check.work);
      set_carrier(pegasus->net);
      if (!(pegasus->flags & PEGASUS_UNPLUG)) {
            queue_delayed_work(pegasus_workqueue, &pegasus->carrier_check,
                  CARRIER_CHECK_DELAY);
      }
}

static int pegasus_probe(struct usb_interface *intf,
                   const struct usb_device_id *id)
{
      struct usb_device *dev = interface_to_usbdev(intf);
      struct net_device *net;
      pegasus_t *pegasus;
      int dev_index = id - pegasus_ids;
      int res = -ENOMEM;
      DECLARE_MAC_BUF(mac);

      usb_get_dev(dev);
      net = alloc_etherdev(sizeof(struct pegasus));
      if (!net) {
            dev_err(&intf->dev, "can't allocate %s\n", "device");
            goto out;
      }

      pegasus = netdev_priv(net);
      pegasus->dev_index = dev_index;
      init_waitqueue_head(&pegasus->ctrl_wait);

      if (!alloc_urbs(pegasus)) {
            dev_err(&intf->dev, "can't allocate %s\n", "urbs");
            goto out1;
      }

      tasklet_init(&pegasus->rx_tl, rx_fixup, (unsigned long) pegasus);

      INIT_DELAYED_WORK(&pegasus->carrier_check, check_carrier);

      pegasus->intf = intf;
      pegasus->usb = dev;
      pegasus->net = net;
      net->open = pegasus_open;
      net->stop = pegasus_close;
      net->watchdog_timeo = PEGASUS_TX_TIMEOUT;
      net->tx_timeout = pegasus_tx_timeout;
      net->do_ioctl = pegasus_ioctl;
      net->hard_start_xmit = pegasus_start_xmit;
      net->set_multicast_list = pegasus_set_multicast;
      net->get_stats = pegasus_netdev_stats;
      SET_ETHTOOL_OPS(net, &ops);
      pegasus->mii.dev = net;
      pegasus->mii.mdio_read = mdio_read;
      pegasus->mii.mdio_write = mdio_write;
      pegasus->mii.phy_id_mask = 0x1f;
      pegasus->mii.reg_num_mask = 0x1f;
      spin_lock_init(&pegasus->rx_pool_lock);
      pegasus->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
                        | NETIF_MSG_PROBE | NETIF_MSG_LINK);

      pegasus->features = usb_dev_id[dev_index].private;
      get_interrupt_interval(pegasus);
      if (reset_mac(pegasus)) {
            dev_err(&intf->dev, "can't reset MAC\n");
            res = -EIO;
            goto out2;
      }
      set_ethernet_addr(pegasus);
      fill_skb_pool(pegasus);
      if (pegasus->features & PEGASUS_II) {
            dev_info(&intf->dev, "setup Pegasus II specific registers\n");
            setup_pegasus_II(pegasus);
      }
      pegasus->phy = mii_phy_probe(pegasus);
      if (pegasus->phy == 0xff) {
            dev_warn(&intf->dev, "can't locate MII phy, using default\n");
            pegasus->phy = 1;
      }
      pegasus->mii.phy_id = pegasus->phy;
      usb_set_intfdata(intf, pegasus);
      SET_NETDEV_DEV(net, &intf->dev);
      pegasus_reset_wol(net);
      res = register_netdev(net);
      if (res)
            goto out3;
      queue_delayed_work(pegasus_workqueue, &pegasus->carrier_check,
                        CARRIER_CHECK_DELAY);

      dev_info(&intf->dev, "%s, %s, %s\n",
             net->name,
             usb_dev_id[dev_index].name,
             print_mac(mac, net->dev_addr));
      return 0;

out3:
      usb_set_intfdata(intf, NULL);
      free_skb_pool(pegasus);
out2:
      free_all_urbs(pegasus);
out1:
      free_netdev(net);
out:
      usb_put_dev(dev);
      return res;
}

static void pegasus_disconnect(struct usb_interface *intf)
{
      struct pegasus *pegasus = usb_get_intfdata(intf);

      usb_set_intfdata(intf, NULL);
      if (!pegasus) {
            dev_dbg(&intf->dev, "unregistering non-bound device?\n");
            return;
      }

      pegasus->flags |= PEGASUS_UNPLUG;
      cancel_delayed_work(&pegasus->carrier_check);
      unregister_netdev(pegasus->net);
      usb_put_dev(interface_to_usbdev(intf));
      unlink_all_urbs(pegasus);
      free_all_urbs(pegasus);
      free_skb_pool(pegasus);
      if (pegasus->rx_skb != NULL) {
            dev_kfree_skb(pegasus->rx_skb);
            pegasus->rx_skb = NULL;
      }
      free_netdev(pegasus->net);
}

static int pegasus_suspend (struct usb_interface *intf, pm_message_t message)
{
      struct pegasus *pegasus = usb_get_intfdata(intf);
      
      netif_device_detach (pegasus->net);
      cancel_delayed_work(&pegasus->carrier_check);
      if (netif_running(pegasus->net)) {
            usb_kill_urb(pegasus->rx_urb);
            usb_kill_urb(pegasus->intr_urb);
      }
      return 0;
}

static int pegasus_resume (struct usb_interface *intf)
{
      struct pegasus *pegasus = usb_get_intfdata(intf);

      netif_device_attach (pegasus->net);
      if (netif_running(pegasus->net)) {
            pegasus->rx_urb->status = 0;
            pegasus->rx_urb->actual_length = 0;
            read_bulk_callback(pegasus->rx_urb);

            pegasus->intr_urb->status = 0;
            pegasus->intr_urb->actual_length = 0;
            intr_callback(pegasus->intr_urb);
      }
      queue_delayed_work(pegasus_workqueue, &pegasus->carrier_check,
                        CARRIER_CHECK_DELAY);
      return 0;
}

static struct usb_driver pegasus_driver = {
      .name = driver_name,
      .probe = pegasus_probe,
      .disconnect = pegasus_disconnect,
      .id_table = pegasus_ids,
      .suspend = pegasus_suspend,
      .resume = pegasus_resume,
};

static void parse_id(char *id)
{
      unsigned int vendor_id=0, device_id=0, flags=0, i=0;
      char *token, *name=NULL;

      if ((token = strsep(&id, ":")) != NULL)
            name = token;
      /* name now points to a null terminated string*/
      if ((token = strsep(&id, ":")) != NULL)
            vendor_id = simple_strtoul(token, NULL, 16);
      if ((token = strsep(&id, ":")) != NULL)
            device_id = simple_strtoul(token, NULL, 16);
      flags = simple_strtoul(id, NULL, 16);
      pr_info("%s: new device %s, vendor ID 0x%04x, device ID 0x%04x, flags: 0x%x\n",
              driver_name, name, vendor_id, device_id, flags);

      if (vendor_id > 0x10000 || vendor_id == 0)
            return;
      if (device_id > 0x10000 || device_id == 0)
            return;

      for (i=0; usb_dev_id[i].name; i++);
      usb_dev_id[i].name = name;
      usb_dev_id[i].vendor = vendor_id;
      usb_dev_id[i].device = device_id;
      usb_dev_id[i].private = flags;
      pegasus_ids[i].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
      pegasus_ids[i].idVendor = vendor_id;
      pegasus_ids[i].idProduct = device_id;
}

static int __init pegasus_init(void)
{
      pr_info("%s: %s, " DRIVER_DESC "\n", driver_name, DRIVER_VERSION);
      if (devid)
            parse_id(devid);
      pegasus_workqueue = create_singlethread_workqueue("pegasus");
      if (!pegasus_workqueue)
            return -ENOMEM;
      return usb_register(&pegasus_driver);
}

static void __exit pegasus_exit(void)
{
      destroy_workqueue(pegasus_workqueue);
      usb_deregister(&pegasus_driver);
}

module_init(pegasus_init);
module_exit(pegasus_exit);

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