pegasus.c

Go to the documentation of this file.

/*
 *  Copyright (c) 1999-2005 Petko Manolov ([email protected])
 *
 * 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 <[email protected]>"
#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 bool loopback;
static bool mii_mode;
static char *devid;

static struct usb_eth_dev usb_dev_id[] = {
#define PEGASUS_DEV(pn, vid, pid, flags)    \
    {.name = pn, .vendor = vid, .device = pid, .private = flags},
#define PEGASUS_DEV_CLASS(pn, vid, pid, dclass, flags) \
    PEGASUS_DEV(pn, vid, pid, flags)
#include "pegasus.h"
#undef  PEGASUS_DEV
#undef  PEGASUS_DEV_CLASS
    {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},
/*
 * The Belkin F8T012xx1 bluetooth adaptor has the same vendor and product
 * IDs as the Belkin F5D5050, so we need to teach the pegasus driver to
 * ignore adaptors belonging to the "Wireless" class 0xE0. For this one
 * case anyway, seeing as the pegasus is for "Wired" adaptors.
 */
#define PEGASUS_DEV_CLASS(pn, vid, pid, dclass, flags) \
    {.match_flags = (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_CLASS), \
    .idVendor = vid, .idProduct = pid, .bDeviceClass = dclass},
#include "pegasus.h"
#undef  PEGASUS_DEV
#undef  PEGASUS_DEV_CLASS
    {},
    {}
};

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 const struct net_device_ops pegasus_netdev_ops;

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;
    int status = urb->status;

    if (!pegasus)
        return;

    switch (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 (net_ratelimit())
            netif_dbg(pegasus, drv, pegasus->net,
                  "%s, status %d\n", __func__, status);
        break;
    }
    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) {
        netif_warn(pegasus, drv, pegasus->net,
               "out of memory in %s\n", __func__);
        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_le16(indx);
    pegasus->dr.wLength = cpu_to_le16(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 (net_ratelimit())
            netif_err(pegasus, drv, pegasus->net,
                  "%s, status %d\n", __func__, 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 = kmemdup(data, size, GFP_KERNEL);
    if (!buffer) {
        netif_warn(pegasus, drv, pegasus->net,
               "out of memory in %s\n", __func__);
        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_WRITE;
    pegasus->dr.bRequest = PEGASUS_REQ_SET_REGS;
    pegasus->dr.wValue = cpu_to_le16(0);
    pegasus->dr.wIndex = cpu_to_le16(indx);
    pegasus->dr.wLength = cpu_to_le16(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);
        netif_err(pegasus, drv, pegasus->net,
              "%s, status %d\n", __func__, 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 = kmemdup(&data, 1, GFP_KERNEL);
    if (!tmp) {
        netif_warn(pegasus, drv, pegasus->net,
               "out of memory in %s\n", __func__);
        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_WRITE;
    pegasus->dr.bRequest = PEGASUS_REQ_SET_REG;
    pegasus->dr.wValue = cpu_to_le16(data);
    pegasus->dr.wIndex = cpu_to_le16(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 (net_ratelimit())
            netif_err(pegasus, drv, pegasus->net,
                  "%s, status %d\n", __func__, 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 = cpu_to_le16(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);
        netif_err(pegasus, drv, pegasus->net,
              "%s, status %d\n", __func__, 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)
        goto fail;

    ret = get_registers(pegasus, PhyData, 2, &regdi);
    *regd = le16_to_cpu(regdi);
    return ret;

fail:
    netif_warn(pegasus, drv, pegasus->net, "%s failed\n", __func__);

    return ret;
}

static int mdio_read(struct net_device *dev, int phy_id, int loc)
{
    pegasus_t *pegasus = 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)
        goto fail;

    return ret;

fail:
    netif_warn(pegasus, drv, pegasus->net, "%s failed\n", __func__);
    return -ETIMEDOUT;
}

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

    ret = get_registers(pegasus, EpromData, 2, &retdatai);
    *retdata = le16_to_cpu(retdatai);
    return ret;

fail:
    netif_warn(pegasus, drv, pegasus->net, "%s failed\n", __func__);
    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;
    __le16 le_data = cpu_to_le16(data);

    set_registers(pegasus, EpromOffset, 4, d);
    enable_eprom_write(pegasus);
    set_register(pegasus, EpromOffset, index);
    set_registers(pegasus, EpromData, 2, &le_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)
        goto fail;

    return ret;

fail:
    netif_warn(pegasus, drv, pegasus->net, "%s failed\n", __func__);
    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_le16(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)
                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 ? 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;
    int status = urb->status;
    u8 *buf = urb->transfer_buffer;
    __u16 pkt_len;

    if (!pegasus)
        return;

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

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

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

    rx_status = buf[count - 2];
    if (rx_status & 0x1e) {
        netif_dbg(pegasus, rx_err, net,
              "RX packet error %x\n", 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) {
        netif_warn(pegasus, rx_err, pegasus->net, "low on memory\n");
        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;
    int status = urb->status;

    if (!pegasus)
        return;

    net = pegasus->net;

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

    switch (status) {
    case -EPIPE:
        /* FIXME schedule_work() to clear the tx halt */
        netif_stop_queue(net);
        netif_warn(pegasus, tx_err, net, "no tx stall recovery\n");
        return;
    case -ENOENT:
    case -ECONNRESET:
    case -ESHUTDOWN:
        netif_dbg(pegasus, ifdown, net, "tx unlink, %d\n", status);
        return;
    default:
        netif_info(pegasus, tx_err, net, "TX status %d\n", status);
        /* FALL THROUGH */
    case 0:
        break;
    }

    net->trans_start = jiffies; /* prevent tx timeout */
    netif_wake_queue(net);
}

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

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

    switch (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
         */
        netif_dbg(pegasus, timer, net, "intr status %d\n", 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];
    }

    res = usb_submit_urb(urb, GFP_ATOMIC);
    if (res == -ENODEV)
        netif_device_detach(pegasus->net);
    if (res)
        netif_err(pegasus, timer, net,
              "can't resubmit interrupt urb, %d\n", res);
}

static void pegasus_tx_timeout(struct net_device *net)
{
    pegasus_t *pegasus = netdev_priv(net);
    netif_warn(pegasus, timer, net, "tx timeout\n");
    usb_unlink_urb(pegasus->tx_urb);
    pegasus->stats.tx_errors++;
}

static netdev_tx_t 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))) {
        netif_warn(pegasus, tx_err, net, "fail tx, %d\n", res);
        switch (res) {
        case -EPIPE:        /* stall, or disconnect from TT */
            /* cleanup should already have been scheduled */
            break;
        case -ENODEV:       /* disconnect() upcoming */
        case -EPERM:
            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;
    }
    dev_kfree_skb(skb);

    return NETDEV_TX_OK;
}

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)
{
    __le16 tmp = cpu_to_le16(0);

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

static inline void get_interrupt_interval(pegasus_t *pegasus)
{
    u16 data;
    u8 interval;

    read_eprom_word(pegasus, 4, &data);
    interval = data >> 8;
    if (pegasus->usb->speed != USB_SPEED_HIGH) {
        if (interval < 0x80) {
            netif_info(pegasus, timer, pegasus->net,
                   "intr interval changed from %ums to %ums\n",
                   interval, 0x80);
            interval = 0x80;
            data = (data & 0x00FF) | ((u16)interval << 8);
#ifdef PEGASUS_WRITE_EEPROM
            write_eprom_word(pegasus, 4, data);
#endif
        }
    }
    pegasus->intr_interval = interval;
}

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);
        netif_dbg(pegasus, ifup, net, "failed rx_urb, %d\n", 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);
        netif_dbg(pegasus, ifup, net, "failed intr_urb, %d\n", res);
        usb_kill_urb(pegasus->rx_urb);
        goto exit;
    }
    if ((res = enable_net_traffic(net, pegasus->usb))) {
        netif_dbg(pegasus, ifup, net,
              "can't enable_net_traffic() - %d\n", 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);
    netif_dbg(pegasus, ifup, net, "open\n");
    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;

    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 const 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;
        netif_info(pegasus, link, net, "Promiscuous mode enabled\n");
    } else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
        pegasus->eth_regs[EthCtrl0] |= RX_MULTICAST;
        pegasus->eth_regs[EthCtrl2] &= ~RX_PROMISCUOUS;
        netif_dbg(pegasus, link, net, "set allmulti\n");
    } else {
        pegasus->eth_regs[EthCtrl0] &= ~RX_MULTICAST;
        pegasus->eth_regs[EthCtrl2] &= ~RX_PROMISCUOUS;
    }

    pegasus->ctrl_urb->status = 0;

    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 int pegasus_count;
static struct workqueue_struct *pegasus_workqueue;
#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_blacklisted(struct usb_device *udev)
{
    struct usb_device_descriptor *udd = &udev->descriptor;

    /* Special quirk to keep the driver from handling the Belkin Bluetooth
     * dongle which happens to have the same ID.
     */
    if ((udd->idVendor == cpu_to_le16(VENDOR_BELKIN)) &&
        (udd->idProduct == cpu_to_le16(0x0121)) &&
        (udd->bDeviceClass == USB_CLASS_WIRELESS_CONTROLLER) &&
        (udd->bDeviceProtocol == 1))
        return 1;

    return 0;
}

/* we rely on probe() and remove() being serialized so we
 * don't need extra locking on pegasus_count.
 */
static void pegasus_dec_workqueue(void)
{
    pegasus_count--;
    if (pegasus_count == 0) {
        destroy_workqueue(pegasus_workqueue);
        pegasus_workqueue = NULL;
    }
}

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;

    if (pegasus_blacklisted(dev))
        return -ENODEV;

    if (pegasus_count == 0) {
        pegasus_workqueue = create_singlethread_workqueue("pegasus");
        if (!pegasus_workqueue)
            return -ENOMEM;
    }
    pegasus_count++;

    net = alloc_etherdev(sizeof(struct pegasus));
    if (!net)
        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->watchdog_timeo = PEGASUS_TX_TIMEOUT;
    net->netdev_ops = &pegasus_netdev_ops;
    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, %pM\n",
         net->name,
         usb_dev_id[dev_index].name,
         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:
    pegasus_dec_workqueue();
    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);
    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);
    pegasus_dec_workqueue();
}

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 const struct net_device_ops pegasus_netdev_ops = {
    .ndo_open =         pegasus_open,
    .ndo_stop =         pegasus_close,
    .ndo_do_ioctl =         pegasus_ioctl,
    .ndo_start_xmit =       pegasus_start_xmit,
    .ndo_set_rx_mode =      pegasus_set_multicast,
    .ndo_get_stats =        pegasus_netdev_stats,
    .ndo_tx_timeout =       pegasus_tx_timeout,
    .ndo_change_mtu =       eth_change_mtu,
    .ndo_set_mac_address =      eth_mac_addr,
    .ndo_validate_addr =        eth_validate_addr,
};

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,
    .disable_hub_initiated_lpm = 1,
};

static void __init 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);
    return usb_register(&pegasus_driver);
}

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

module_init(pegasus_init);
module_exit(pegasus_exit);