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zd1201.c

/*
 *    Driver for ZyDAS zd1201 based wireless USB devices.
 *
 *    Copyright (c) 2004, 2005 Jeroen Vreeken (pe1rxq@amsat.org)
 *
 *    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.
 *
 *    Parts of this driver have been derived from a wlan-ng version
 *    modified by ZyDAS. They also made documentation available, thanks!
 *    Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
 */

#include <linux/module.h>
#include <linux/usb.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/wireless.h>
#include <net/iw_handler.h>
#include <linux/string.h>
#include <linux/if_arp.h>
#include <linux/firmware.h>
#include <net/ieee80211.h>
#include "zd1201.h"

static struct usb_device_id zd1201_table[] = {
      {USB_DEVICE(0x0586, 0x3400)}, /* Peabird Wireless USB Adapter */
      {USB_DEVICE(0x0ace, 0x1201)}, /* ZyDAS ZD1201 Wireless USB Adapter */
      {USB_DEVICE(0x050d, 0x6051)}, /* Belkin F5D6051 usb  adapter */
      {USB_DEVICE(0x0db0, 0x6823)}, /* MSI UB11B usb  adapter */
      {USB_DEVICE(0x1044, 0x8005)}, /* GIGABYTE GN-WLBZ201 usb adapter */
      {}
};

static int ap;    /* Are we an AP or a normal station? */

#define ZD1201_VERSION  "0.15"

MODULE_AUTHOR("Jeroen Vreeken <pe1rxq@amsat.org>");
MODULE_DESCRIPTION("Driver for ZyDAS ZD1201 based USB Wireless adapters");
MODULE_VERSION(ZD1201_VERSION);
MODULE_LICENSE("GPL");
module_param(ap, int, 0);
MODULE_PARM_DESC(ap, "If non-zero Access Point firmware will be loaded");
MODULE_DEVICE_TABLE(usb, zd1201_table);


static int zd1201_fw_upload(struct usb_device *dev, int apfw)
{
      const struct firmware *fw_entry;
      char *data;
      unsigned long len;
      int err;
      unsigned char ret;
      char *buf;
      char *fwfile;

      if (apfw)
            fwfile = "zd1201-ap.fw";
      else
            fwfile = "zd1201.fw";

      err = request_firmware(&fw_entry, fwfile, &dev->dev);
      if (err) {
            dev_err(&dev->dev, "Failed to load %s firmware file!\n", fwfile);
            dev_err(&dev->dev, "Make sure the hotplug firmware loader is installed.\n");
            dev_err(&dev->dev, "Goto http://linux-lc100020.sourceforge.net for more info.\n");
            return err;
      }

      data = fw_entry->data;
        len = fw_entry->size;

      buf = kmalloc(1024, GFP_ATOMIC);
      if (!buf)
            goto exit;
      
      while (len > 0) {
            int translen = (len > 1024) ? 1024 : len;
            memcpy(buf, data, translen);

            err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 0,
                USB_DIR_OUT | 0x40, 0, 0, buf, translen,
                ZD1201_FW_TIMEOUT);
            if (err < 0)
                  goto exit;

            len -= translen;
            data += translen;
      }
                                        
      err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 0x2,
          USB_DIR_OUT | 0x40, 0, 0, NULL, 0, ZD1201_FW_TIMEOUT);
      if (err < 0)
            goto exit;

      err = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 0x4,
          USB_DIR_IN | 0x40, 0,0, &ret, sizeof(ret), ZD1201_FW_TIMEOUT);
      if (err < 0)
            goto exit;

      if (ret & 0x80) {
            err = -EIO;
            goto exit;
      }

      err = 0;
exit:
      kfree(buf);
      release_firmware(fw_entry);
      return err;
}

static void zd1201_usbfree(struct urb *urb)
{
      struct zd1201 *zd = urb->context;

      switch(urb->status) {
            case -EILSEQ:
            case -ENODEV:
            case -ETIME:
            case -ENOENT:
            case -EPIPE:
            case -EOVERFLOW:
            case -ESHUTDOWN:
                  dev_warn(&zd->usb->dev, "%s: urb failed: %d\n", 
                      zd->dev->name, urb->status);
      }

      kfree(urb->transfer_buffer);
      usb_free_urb(urb);
      return;
}

/* cmdreq message: 
      u32 type
      u16 cmd
      u16 parm0
      u16 parm1
      u16 parm2
      u8  pad[4]

      total: 4 + 2 + 2 + 2 + 2 + 4 = 16
*/
static int zd1201_docmd(struct zd1201 *zd, int cmd, int parm0,
                  int parm1, int parm2)
{
      unsigned char *command;
      int ret;
      struct urb *urb;

      command = kmalloc(16, GFP_ATOMIC);
      if (!command)
            return -ENOMEM;

      *((__le32*)command) = cpu_to_le32(ZD1201_USB_CMDREQ);
      *((__le16*)&command[4]) = cpu_to_le16(cmd);
      *((__le16*)&command[6]) = cpu_to_le16(parm0);
      *((__le16*)&command[8]) = cpu_to_le16(parm1);
      *((__le16*)&command[10])= cpu_to_le16(parm2);

      urb = usb_alloc_urb(0, GFP_ATOMIC);
      if (!urb) {
            kfree(command);
            return -ENOMEM;
      }
      usb_fill_bulk_urb(urb, zd->usb, usb_sndbulkpipe(zd->usb, zd->endp_out2),
                    command, 16, zd1201_usbfree, zd);
      ret = usb_submit_urb(urb, GFP_ATOMIC);
      if (ret) {
            kfree(command);
            usb_free_urb(urb);
      }

      return ret;
}

/* Callback after sending out a packet */
static void zd1201_usbtx(struct urb *urb)
{
      struct zd1201 *zd = urb->context;
      netif_wake_queue(zd->dev);
      return;
}

/* Incoming data */
static void zd1201_usbrx(struct urb *urb)
{
      struct zd1201 *zd = urb->context;
      int free = 0;
      unsigned char *data = urb->transfer_buffer;
      struct sk_buff *skb;
      unsigned char type;

      if (!zd)
            return;

      switch(urb->status) {
            case -EILSEQ:
            case -ENODEV:
            case -ETIME:
            case -ENOENT:
            case -EPIPE:
            case -EOVERFLOW:
            case -ESHUTDOWN:
                  dev_warn(&zd->usb->dev, "%s: rx urb failed: %d\n",
                      zd->dev->name, urb->status);
                  free = 1;
                  goto exit;
      }
      
      if (urb->status != 0 || urb->actual_length == 0)
            goto resubmit;

      type = data[0];
      if (type == ZD1201_PACKET_EVENTSTAT || type == ZD1201_PACKET_RESOURCE) {
            memcpy(zd->rxdata, data, urb->actual_length);
            zd->rxlen = urb->actual_length;
            zd->rxdatas = 1;
            wake_up(&zd->rxdataq);
      }
      /* Info frame */
      if (type == ZD1201_PACKET_INQUIRE) {
            int i = 0;
            unsigned short infotype, framelen, copylen;
            framelen = le16_to_cpu(*(__le16*)&data[4]);
            infotype = le16_to_cpu(*(__le16*)&data[6]);

            if (infotype == ZD1201_INF_LINKSTATUS) {
                  short linkstatus;

                  linkstatus = le16_to_cpu(*(__le16*)&data[8]);
                  switch(linkstatus) {
                        case 1:
                              netif_carrier_on(zd->dev);
                              break;
                        case 2:
                              netif_carrier_off(zd->dev);
                              break;
                        case 3:
                              netif_carrier_off(zd->dev);
                              break;
                        case 4:
                              netif_carrier_on(zd->dev);
                              break;
                        default:
                              netif_carrier_off(zd->dev);
                  }
                  goto resubmit;
            }
            if (infotype == ZD1201_INF_ASSOCSTATUS) {
                  short status = le16_to_cpu(*(__le16*)(data+8));
                  int event;
                  union iwreq_data wrqu;

                  switch (status) {
                        case ZD1201_ASSOCSTATUS_STAASSOC:
                        case ZD1201_ASSOCSTATUS_REASSOC:
                              event = IWEVREGISTERED;
                              break;
                        case ZD1201_ASSOCSTATUS_DISASSOC:
                        case ZD1201_ASSOCSTATUS_ASSOCFAIL:
                        case ZD1201_ASSOCSTATUS_AUTHFAIL:
                        default:
                              event = IWEVEXPIRED;
                  }
                  memcpy(wrqu.addr.sa_data, data+10, ETH_ALEN);
                  wrqu.addr.sa_family = ARPHRD_ETHER;

                  /* Send event to user space */
                  wireless_send_event(zd->dev, event, &wrqu, NULL);

                  goto resubmit;
            }
            if (infotype == ZD1201_INF_AUTHREQ) {
                  union iwreq_data wrqu;

                  memcpy(wrqu.addr.sa_data, data+8, ETH_ALEN);
                  wrqu.addr.sa_family = ARPHRD_ETHER;
                  /* There isn't a event that trully fits this request.
                     We assume that userspace will be smart enough to
                     see a new station being expired and sends back a
                     authstation ioctl to authorize it. */
                  wireless_send_event(zd->dev, IWEVEXPIRED, &wrqu, NULL);
                  goto resubmit;
            }
            /* Other infotypes are handled outside this handler */
            zd->rxlen = 0;
            while (i < urb->actual_length) {
                  copylen = le16_to_cpu(*(__le16*)&data[i+2]);
                  /* Sanity check, sometimes we get junk */
                  if (copylen+zd->rxlen > sizeof(zd->rxdata))
                        break;
                  memcpy(zd->rxdata+zd->rxlen, data+i+4, copylen);
                  zd->rxlen += copylen;
                  i += 64;
            }
            if (i >= urb->actual_length) {
                  zd->rxdatas = 1;
                  wake_up(&zd->rxdataq);
            }
            goto  resubmit;
      }
      /* Actual data */
      if (data[urb->actual_length-1] == ZD1201_PACKET_RXDATA) {
            int datalen = urb->actual_length-1;
            unsigned short len, fc, seq;
            struct hlist_node *node;

            len = ntohs(*(__be16 *)&data[datalen-2]);
            if (len>datalen)
                  len=datalen;
            fc = le16_to_cpu(*(__le16 *)&data[datalen-16]);
            seq = le16_to_cpu(*(__le16 *)&data[datalen-24]);

            if (zd->monitor) {
                  if (datalen < 24)
                        goto resubmit;
                  if (!(skb = dev_alloc_skb(datalen+24)))
                        goto resubmit;
                  
                  memcpy(skb_put(skb, 2), &data[datalen-16], 2);
                  memcpy(skb_put(skb, 2), &data[datalen-2], 2);
                  memcpy(skb_put(skb, 6), &data[datalen-14], 6);
                  memcpy(skb_put(skb, 6), &data[datalen-22], 6);
                  memcpy(skb_put(skb, 6), &data[datalen-8], 6);
                  memcpy(skb_put(skb, 2), &data[datalen-24], 2);
                  memcpy(skb_put(skb, len), data, len);
                  skb->protocol = eth_type_trans(skb, zd->dev);
                  skb->dev->last_rx = jiffies;
                  zd->stats.rx_packets++;
                  zd->stats.rx_bytes += skb->len;
                  netif_rx(skb);
                  goto resubmit;
            }
                  
            if ((seq & IEEE80211_SCTL_FRAG) ||
                (fc & IEEE80211_FCTL_MOREFRAGS)) {
                  struct zd1201_frag *frag = NULL;
                  char *ptr;

                  if (datalen<14)
                        goto resubmit;
                  if ((seq & IEEE80211_SCTL_FRAG) == 0) {
                        frag = kmalloc(sizeof(*frag), GFP_ATOMIC);
                        if (!frag)
                              goto resubmit;
                        skb = dev_alloc_skb(IEEE80211_DATA_LEN +14+2);
                        if (!skb) {
                              kfree(frag);
                              goto resubmit;
                        }
                        frag->skb = skb;
                        frag->seq = seq & IEEE80211_SCTL_SEQ;
                        skb_reserve(skb, 2);
                        memcpy(skb_put(skb, 12), &data[datalen-14], 12);
                        memcpy(skb_put(skb, 2), &data[6], 2);
                        memcpy(skb_put(skb, len), data+8, len);
                        hlist_add_head(&frag->fnode, &zd->fraglist);
                        goto resubmit;
                  }
                  hlist_for_each_entry(frag, node, &zd->fraglist, fnode)
                        if (frag->seq == (seq&IEEE80211_SCTL_SEQ))
                              break;
                  if (!frag)
                        goto resubmit;
                  skb = frag->skb;
                  ptr = skb_put(skb, len);
                  if (ptr)
                        memcpy(ptr, data+8, len);
                  if (fc & IEEE80211_FCTL_MOREFRAGS)
                        goto resubmit;
                  hlist_del_init(&frag->fnode);
                  kfree(frag);
            } else {
                  if (datalen<14)
                        goto resubmit;
                  skb = dev_alloc_skb(len + 14 + 2);
                  if (!skb)
                        goto resubmit;
                  skb_reserve(skb, 2);
                  memcpy(skb_put(skb, 12), &data[datalen-14], 12);
                  memcpy(skb_put(skb, 2), &data[6], 2);
                  memcpy(skb_put(skb, len), data+8, len);
            }
            skb->protocol = eth_type_trans(skb, zd->dev);
            skb->dev->last_rx = jiffies;
            zd->stats.rx_packets++;
            zd->stats.rx_bytes += skb->len;
            netif_rx(skb);
      }
resubmit:
      memset(data, 0, ZD1201_RXSIZE);

      urb->status = 0;
      urb->dev = zd->usb;
      if(usb_submit_urb(urb, GFP_ATOMIC))
            free = 1;

exit:
      if (free) {
            zd->rxlen = 0;
            zd->rxdatas = 1;
            wake_up(&zd->rxdataq);
            kfree(urb->transfer_buffer);
      }
      return;
}

static int zd1201_getconfig(struct zd1201 *zd, int rid, void *riddata,
      unsigned int riddatalen)
{
      int err;
      int i = 0;
      int code;
      int rid_fid;
      int length;
      unsigned char *pdata;

      zd->rxdatas = 0;
      err = zd1201_docmd(zd, ZD1201_CMDCODE_ACCESS, rid, 0, 0);
      if (err)
            return err;

      wait_event_interruptible(zd->rxdataq, zd->rxdatas);
      if (!zd->rxlen)
            return -EIO;

      code = le16_to_cpu(*(__le16*)(&zd->rxdata[4]));
      rid_fid = le16_to_cpu(*(__le16*)(&zd->rxdata[6]));
      length = le16_to_cpu(*(__le16*)(&zd->rxdata[8]));
      if (length > zd->rxlen)
            length = zd->rxlen-6;

      /* If access bit is not on, then error */
      if ((code & ZD1201_ACCESSBIT) != ZD1201_ACCESSBIT || rid_fid != rid )
            return -EINVAL;

      /* Not enough buffer for allocating data */
      if (riddatalen != (length - 4)) {
            dev_dbg(&zd->usb->dev, "riddatalen mismatches, expected=%u, (packet=%u) length=%u, rid=0x%04X, rid_fid=0x%04X\n",
                riddatalen, zd->rxlen, length, rid, rid_fid);
            return -ENODATA;
      }

      zd->rxdatas = 0;
      /* Issue SetRxRid commnd */               
      err = zd1201_docmd(zd, ZD1201_CMDCODE_SETRXRID, rid, 0, length);
      if (err)
            return err;

      /* Receive RID record from resource packets */
      wait_event_interruptible(zd->rxdataq, zd->rxdatas);
      if (!zd->rxlen)
            return -EIO;

      if (zd->rxdata[zd->rxlen - 1] != ZD1201_PACKET_RESOURCE) {
            dev_dbg(&zd->usb->dev, "Packet type mismatch: 0x%x not 0x3\n",
                zd->rxdata[zd->rxlen-1]);
            return -EINVAL;
      }

      /* Set the data pointer and received data length */
      pdata = zd->rxdata;
      length = zd->rxlen;

      do {
            int actual_length;

            actual_length = (length > 64) ? 64 : length;

            if (pdata[0] != 0x3) {
                  dev_dbg(&zd->usb->dev, "Rx Resource packet type error: %02X\n",
                      pdata[0]);
                  return -EINVAL;
            }

            if (actual_length != 64) {
                  /* Trim the last packet type byte */
                  actual_length--;
            }

            /* Skip the 4 bytes header (RID length and RID) */
            if (i == 0) {
                  pdata += 8;
                  actual_length -= 8;
            } else {
                  pdata += 4;
                  actual_length -= 4;
            }
            
            memcpy(riddata, pdata, actual_length);
            riddata += actual_length;
            pdata += actual_length;
            length -= 64;
            i++;
      } while (length > 0);

      return 0;
}

/*
 *    resreq:
 *          byte  type
 *          byte  sequence
 *          u16   reserved
 *          byte  data[12]
 *    total: 16
 */
static int zd1201_setconfig(struct zd1201 *zd, int rid, void *buf, int len, int wait)
{
      int err;
      unsigned char *request;
      int reqlen;
      char seq=0;
      struct urb *urb;
      gfp_t gfp_mask = wait ? GFP_NOIO : GFP_ATOMIC;

      len += 4;               /* first 4 are for header */

      zd->rxdatas = 0;
      zd->rxlen = 0;
      for (seq=0; len > 0; seq++) {
            request = kmalloc(16, gfp_mask);
            if (!request)
                  return -ENOMEM;
            urb = usb_alloc_urb(0, gfp_mask);
            if (!urb) {
                  kfree(request);
                  return -ENOMEM;
            }
            memset(request, 0, 16);
            reqlen = len>12 ? 12 : len;
            request[0] = ZD1201_USB_RESREQ;
            request[1] = seq;
            request[2] = 0;
            request[3] = 0;
            if (request[1] == 0) {
                  /* add header */
                  *(__le16*)&request[4] = cpu_to_le16((len-2+1)/2);
                  *(__le16*)&request[6] = cpu_to_le16(rid);
                  memcpy(request+8, buf, reqlen-4);
                  buf += reqlen-4;
            } else {
                  memcpy(request+4, buf, reqlen);
                  buf += reqlen;
            }

            len -= reqlen;

            usb_fill_bulk_urb(urb, zd->usb, usb_sndbulkpipe(zd->usb,
                zd->endp_out2), request, 16, zd1201_usbfree, zd);
            err = usb_submit_urb(urb, gfp_mask);
            if (err)
                  goto err;
      }

      request = kmalloc(16, gfp_mask);
      if (!request)
            return -ENOMEM;
      urb = usb_alloc_urb(0, gfp_mask);
      if (!urb) {
            kfree(request);
            return -ENOMEM;
      }
      *((__le32*)request) = cpu_to_le32(ZD1201_USB_CMDREQ);
      *((__le16*)&request[4]) = 
          cpu_to_le16(ZD1201_CMDCODE_ACCESS|ZD1201_ACCESSBIT);
      *((__le16*)&request[6]) = cpu_to_le16(rid);
      *((__le16*)&request[8]) = cpu_to_le16(0);
      *((__le16*)&request[10]) = cpu_to_le16(0);
      usb_fill_bulk_urb(urb, zd->usb, usb_sndbulkpipe(zd->usb, zd->endp_out2),
           request, 16, zd1201_usbfree, zd);
      err = usb_submit_urb(urb, gfp_mask);
      if (err)
            goto err;
      
      if (wait) {
            wait_event_interruptible(zd->rxdataq, zd->rxdatas);
            if (!zd->rxlen || le16_to_cpu(*(__le16*)&zd->rxdata[6]) != rid) {
                  dev_dbg(&zd->usb->dev, "wrong or no RID received\n");
            }
      }

      return 0;
err:
      kfree(request);
      usb_free_urb(urb);
      return err;
}

static inline int zd1201_getconfig16(struct zd1201 *zd, int rid, short *val)
{
      int err;
      __le16 zdval;

      err = zd1201_getconfig(zd, rid, &zdval, sizeof(__le16));
      if (err)
            return err;
      *val = le16_to_cpu(zdval);
      return 0;
}

static inline int zd1201_setconfig16(struct zd1201 *zd, int rid, short val)
{
      __le16 zdval = cpu_to_le16(val);
      return (zd1201_setconfig(zd, rid, &zdval, sizeof(__le16), 1));
}

static int zd1201_drvr_start(struct zd1201 *zd)
{
      int err, i;
      short max;
      __le16 zdmax;
      unsigned char *buffer;

      buffer = kzalloc(ZD1201_RXSIZE, GFP_KERNEL);
      if (!buffer)
            return -ENOMEM;

      usb_fill_bulk_urb(zd->rx_urb, zd->usb, 
          usb_rcvbulkpipe(zd->usb, zd->endp_in), buffer, ZD1201_RXSIZE,
          zd1201_usbrx, zd);

      err = usb_submit_urb(zd->rx_urb, GFP_KERNEL);
      if (err)
            goto err_buffer;

      err = zd1201_docmd(zd, ZD1201_CMDCODE_INIT, 0, 0, 0);
      if (err)
            goto err_urb;

      err = zd1201_getconfig(zd, ZD1201_RID_CNFMAXTXBUFFERNUMBER, &zdmax,
          sizeof(__le16));
      if (err)
            goto err_urb;

      max = le16_to_cpu(zdmax);
      for (i=0; i<max; i++) {
            err = zd1201_docmd(zd, ZD1201_CMDCODE_ALLOC, 1514, 0, 0);
            if (err)
                  goto err_urb;
      }

      return 0;

err_urb:
      usb_kill_urb(zd->rx_urb);
      return err;
err_buffer:
      kfree(buffer);
      return err;
}

/*    Magic alert: The firmware doesn't seem to like the MAC state being
 *    toggled in promisc (aka monitor) mode.
 *    (It works a number of times, but will halt eventually)
 *    So we turn it of before disabling and on after enabling if needed.
 */
static int zd1201_enable(struct zd1201 *zd)
{
      int err;

      if (zd->mac_enabled)
            return 0;

      err = zd1201_docmd(zd, ZD1201_CMDCODE_ENABLE, 0, 0, 0);
      if (!err)
            zd->mac_enabled = 1;

      if (zd->monitor)
            err = zd1201_setconfig16(zd, ZD1201_RID_PROMISCUOUSMODE, 1);

      return err;
}

static int zd1201_disable(struct zd1201 *zd)
{
      int err;

      if (!zd->mac_enabled)
            return 0;
      if (zd->monitor) {
            err = zd1201_setconfig16(zd, ZD1201_RID_PROMISCUOUSMODE, 0);
            if (err)
                  return err;
      }

      err = zd1201_docmd(zd, ZD1201_CMDCODE_DISABLE, 0, 0, 0);
      if (!err)
            zd->mac_enabled = 0;
      return err;
}

static int zd1201_mac_reset(struct zd1201 *zd)
{
      if (!zd->mac_enabled)
            return 0;
      zd1201_disable(zd);
      return zd1201_enable(zd);
}

static int zd1201_join(struct zd1201 *zd, char *essid, int essidlen)
{
      int err, val;
      char buf[IW_ESSID_MAX_SIZE+2];

      err = zd1201_disable(zd);
      if (err)
            return err;

      val = ZD1201_CNFAUTHENTICATION_OPENSYSTEM;
      val |= ZD1201_CNFAUTHENTICATION_SHAREDKEY;
      err = zd1201_setconfig16(zd, ZD1201_RID_CNFAUTHENTICATION, val);
      if (err)
            return err;

      *(__le16 *)buf = cpu_to_le16(essidlen);
      memcpy(buf+2, essid, essidlen);
      if (!zd->ap) {    /* Normal station */
            err = zd1201_setconfig(zd, ZD1201_RID_CNFDESIREDSSID, buf,
                IW_ESSID_MAX_SIZE+2, 1);
            if (err)
                  return err;
      } else {    /* AP */
            err = zd1201_setconfig(zd, ZD1201_RID_CNFOWNSSID, buf,
                IW_ESSID_MAX_SIZE+2, 1);
            if (err)
                  return err;
      }

      err = zd1201_setconfig(zd, ZD1201_RID_CNFOWNMACADDR, 
          zd->dev->dev_addr, zd->dev->addr_len, 1);
      if (err)
            return err;

      err = zd1201_enable(zd);
      if (err)
            return err;

      msleep(100);
      return 0;
}

static int zd1201_net_open(struct net_device *dev)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;

      /* Start MAC with wildcard if no essid set */
      if (!zd->mac_enabled)
            zd1201_join(zd, zd->essid, zd->essidlen);
      netif_start_queue(dev);

      return 0;
}

static int zd1201_net_stop(struct net_device *dev)
{
      netif_stop_queue(dev);
      return 0;
}

/*
      RFC 1042 encapsulates Ethernet frames in 802.11 frames
      by prefixing them with 0xaa, 0xaa, 0x03) followed by a SNAP OID of 0
      (0x00, 0x00, 0x00). Zd requires an additional padding, copy
      of ethernet addresses, length of the standard RFC 1042 packet
      and a command byte (which is nul for tx).
      
      tx frame (from Wlan NG):
      RFC 1042:
            llc         0xAA 0xAA 0x03 (802.2 LLC)
            snap        0x00 0x00 0x00 (Ethernet encapsulated)
            type        2 bytes, Ethernet type field
            payload           (minus eth header)
      Zydas specific:
            padding           1B if (skb->len+8+1)%64==0
            Eth MAC addr      12 bytes, Ethernet MAC addresses
            length            2 bytes, RFC 1042 packet length 
                        (llc+snap+type+payload)
            zd          1 null byte, zd1201 packet type
 */
static int zd1201_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      unsigned char *txbuf = zd->txdata;
      int txbuflen, pad = 0, err;
      struct urb *urb = zd->tx_urb;

      if (!zd->mac_enabled || zd->monitor) {
            zd->stats.tx_dropped++;
            kfree_skb(skb);
            return 0;
      }
      netif_stop_queue(dev);

      txbuflen = skb->len + 8 + 1;
      if (txbuflen%64 == 0) {
            pad = 1;
            txbuflen++;
      }
      txbuf[0] = 0xAA;
      txbuf[1] = 0xAA;
      txbuf[2] = 0x03;
      txbuf[3] = 0x00;  /* rfc1042 */
      txbuf[4] = 0x00;
      txbuf[5] = 0x00;

      skb_copy_from_linear_data_offset(skb, 12, txbuf + 6, skb->len - 12);
      if (pad)
            txbuf[skb->len-12+6]=0;
      skb_copy_from_linear_data(skb, txbuf + skb->len - 12 + 6 + pad, 12);
      *(__be16*)&txbuf[skb->len+6+pad] = htons(skb->len-12+6);
      txbuf[txbuflen-1] = 0;

      usb_fill_bulk_urb(urb, zd->usb, usb_sndbulkpipe(zd->usb, zd->endp_out),
          txbuf, txbuflen, zd1201_usbtx, zd);

      err = usb_submit_urb(zd->tx_urb, GFP_ATOMIC);
      if (err) {
            zd->stats.tx_errors++;
            netif_start_queue(dev);
            return err;
      }
      zd->stats.tx_packets++;
      zd->stats.tx_bytes += skb->len;
      dev->trans_start = jiffies;
      kfree_skb(skb);

      return 0;
}

static void zd1201_tx_timeout(struct net_device *dev)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;

      if (!zd)
            return;
      dev_warn(&zd->usb->dev, "%s: TX timeout, shooting down urb\n",
          dev->name);
      usb_unlink_urb(zd->tx_urb);
      zd->stats.tx_errors++;
      /* Restart the timeout to quiet the watchdog: */
      dev->trans_start = jiffies;
}

static int zd1201_set_mac_address(struct net_device *dev, void *p)
{
      struct sockaddr *addr = p;
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      int err;

      if (!zd)
            return -ENODEV;

      err = zd1201_setconfig(zd, ZD1201_RID_CNFOWNMACADDR, 
          addr->sa_data, dev->addr_len, 1);
      if (err)
            return err;
      memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

      return zd1201_mac_reset(zd);
}

static struct net_device_stats *zd1201_get_stats(struct net_device *dev)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;

      return &zd->stats;
}

static struct iw_statistics *zd1201_get_wireless_stats(struct net_device *dev)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;

      return &zd->iwstats;
}

static void zd1201_set_multicast(struct net_device *dev)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      struct dev_mc_list *mc = dev->mc_list;
      unsigned char reqbuf[ETH_ALEN*ZD1201_MAXMULTI];
      int i;

      if (dev->mc_count > ZD1201_MAXMULTI)
            return;

      for (i=0; i<dev->mc_count; i++) {
            memcpy(reqbuf+i*ETH_ALEN, mc->dmi_addr, ETH_ALEN);
            mc = mc->next;
      }
      zd1201_setconfig(zd, ZD1201_RID_CNFGROUPADDRESS, reqbuf,
          dev->mc_count*ETH_ALEN, 0);
      
}

static int zd1201_config_commit(struct net_device *dev, 
    struct iw_request_info *info, struct iw_point *data, char *essid)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;

      return zd1201_mac_reset(zd);
}

static int zd1201_get_name(struct net_device *dev,
    struct iw_request_info *info, char *name, char *extra)
{
      strcpy(name, "IEEE 802.11b");
      return 0;
}

static int zd1201_set_freq(struct net_device *dev,
    struct iw_request_info *info, struct iw_freq *freq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short channel = 0;
      int err;

      if (freq->e == 0)
            channel = freq->m;
      else {
            if (freq->m >= 2482)
                  channel = 14;
            if (freq->m >= 2407)
                  channel = (freq->m-2407)/5;
      }

      err = zd1201_setconfig16(zd, ZD1201_RID_CNFOWNCHANNEL, channel);
      if (err)
            return err;

      zd1201_mac_reset(zd);

      return 0;
}

static int zd1201_get_freq(struct net_device *dev,
    struct iw_request_info *info, struct iw_freq *freq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short channel;
      int err;

      err = zd1201_getconfig16(zd, ZD1201_RID_CNFOWNCHANNEL, &channel);
      if (err)
            return err;
      freq->e = 0;
      freq->m = channel;

      return 0;
}

static int zd1201_set_mode(struct net_device *dev,
    struct iw_request_info *info, __u32 *mode, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short porttype, monitor = 0;
      unsigned char buffer[IW_ESSID_MAX_SIZE+2];
      int err;

      if (zd->ap) {
            if (*mode != IW_MODE_MASTER)
                  return -EINVAL;
            return 0;
      }

      err = zd1201_setconfig16(zd, ZD1201_RID_PROMISCUOUSMODE, 0);
      if (err)
            return err;
      zd->dev->type = ARPHRD_ETHER;
      switch(*mode) {
            case IW_MODE_MONITOR:
                  monitor = 1;
                  zd->dev->type = ARPHRD_IEEE80211;
                  /* Make sure we are no longer associated with by
                     setting an 'impossible' essid.
                     (otherwise we mess up firmware)
                   */
                  zd1201_join(zd, "\0-*#\0", 5);
                  /* Put port in pIBSS */
            case 8: /* No pseudo-IBSS in wireless extensions (yet) */
                  porttype = ZD1201_PORTTYPE_PSEUDOIBSS;
                  break;
            case IW_MODE_ADHOC:
                  porttype = ZD1201_PORTTYPE_IBSS;
                  break;
            case IW_MODE_INFRA:
                  porttype = ZD1201_PORTTYPE_BSS;
                  break;
            default:
                  return -EINVAL;
      }

      err = zd1201_setconfig16(zd, ZD1201_RID_CNFPORTTYPE, porttype);
      if (err)
            return err;
      if (zd->monitor && !monitor) {
                  zd1201_disable(zd);
                  *(__le16 *)buffer = cpu_to_le16(zd->essidlen);
                  memcpy(buffer+2, zd->essid, zd->essidlen);
                  err = zd1201_setconfig(zd, ZD1201_RID_CNFDESIREDSSID,
                      buffer, IW_ESSID_MAX_SIZE+2, 1);
                  if (err)
                        return err;
      }
      zd->monitor = monitor;
      /* If monitor mode is set we don't actually turn it on here since it
       * is done during mac reset anyway (see zd1201_mac_enable).
       */
      zd1201_mac_reset(zd);

      return 0;
}

static int zd1201_get_mode(struct net_device *dev,
    struct iw_request_info *info, __u32 *mode, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short porttype;
      int err;

      err = zd1201_getconfig16(zd, ZD1201_RID_CNFPORTTYPE, &porttype);
      if (err)
            return err;
      switch(porttype) {
            case ZD1201_PORTTYPE_IBSS:
                  *mode = IW_MODE_ADHOC;
                  break;
            case ZD1201_PORTTYPE_BSS:
                  *mode = IW_MODE_INFRA;
                  break;
            case ZD1201_PORTTYPE_WDS:
                  *mode = IW_MODE_REPEAT;
                  break;
            case ZD1201_PORTTYPE_PSEUDOIBSS:
                  *mode = 8;/* No Pseudo-IBSS... */
                  break;
            case ZD1201_PORTTYPE_AP:
                  *mode = IW_MODE_MASTER;
                  break;
            default:
                  dev_dbg(&zd->usb->dev, "Unknown porttype: %d\n",
                      porttype);
                  *mode = IW_MODE_AUTO;
      }
      if (zd->monitor)
            *mode = IW_MODE_MONITOR;

      return 0;
}

static int zd1201_get_range(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *wrq, char *extra)
{
      struct iw_range *range = (struct iw_range *)extra;

      wrq->length = sizeof(struct iw_range);
      memset(range, 0, sizeof(struct iw_range));
      range->we_version_compiled = WIRELESS_EXT;
      range->we_version_source = WIRELESS_EXT;

      range->max_qual.qual = 128;
      range->max_qual.level = 128;
      range->max_qual.noise = 128;
      range->max_qual.updated = 7;

      range->encoding_size[0] = 5;
      range->encoding_size[1] = 13;
      range->num_encoding_sizes = 2;
      range->max_encoding_tokens = ZD1201_NUMKEYS;

      range->num_bitrates = 4;
      range->bitrate[0] = 1000000;
      range->bitrate[1] = 2000000;
      range->bitrate[2] = 5500000;
      range->bitrate[3] = 11000000;

      range->min_rts = 0;
      range->min_frag = ZD1201_FRAGMIN;
      range->max_rts = ZD1201_RTSMAX;
      range->min_frag = ZD1201_FRAGMAX;

      return 0;
}

/*    Little bit of magic here: we only get the quality if we poll
 *    for it, and we never get an actual request to trigger such
 *    a poll. Therefore we 'assume' that the user will soon ask for
 *    the stats after asking the bssid.
 */
static int zd1201_get_wap(struct net_device *dev,
    struct iw_request_info *info, struct sockaddr *ap_addr, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      unsigned char buffer[6];

      if (!zd1201_getconfig(zd, ZD1201_RID_COMMSQUALITY, buffer, 6)) {
            /* Unfortunately the quality and noise reported is useless.
               they seem to be accumulators that increase until you
               read them, unless we poll on a fixed interval we can't
               use them
             */
            /*zd->iwstats.qual.qual = le16_to_cpu(((__le16 *)buffer)[0]);*/
            zd->iwstats.qual.level = le16_to_cpu(((__le16 *)buffer)[1]);
            /*zd->iwstats.qual.noise = le16_to_cpu(((__le16 *)buffer)[2]);*/
            zd->iwstats.qual.updated = 2;
      }

      return zd1201_getconfig(zd, ZD1201_RID_CURRENTBSSID, ap_addr->sa_data, 6);
}

static int zd1201_set_scan(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *srq, char *extra)
{
      /* We do everything in get_scan */
      return 0;
}

static int zd1201_get_scan(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *srq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      int err, i, j, enabled_save;
      struct iw_event iwe;
      char *cev = extra;
      char *end_buf = extra + IW_SCAN_MAX_DATA;

      /* No scanning in AP mode */
      if (zd->ap)
            return -EOPNOTSUPP;

      /* Scan doesn't seem to work if disabled */
      enabled_save = zd->mac_enabled;
      zd1201_enable(zd);

      zd->rxdatas = 0;
      err = zd1201_docmd(zd, ZD1201_CMDCODE_INQUIRE, 
           ZD1201_INQ_SCANRESULTS, 0, 0);
      if (err)
            return err;

      wait_event_interruptible(zd->rxdataq, zd->rxdatas);
      if (!zd->rxlen)
            return -EIO;

      if (le16_to_cpu(*(__le16*)&zd->rxdata[2]) != ZD1201_INQ_SCANRESULTS)
            return -EIO;

      for(i=8; i<zd->rxlen; i+=62) {
            iwe.cmd = SIOCGIWAP;
            iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
            memcpy(iwe.u.ap_addr.sa_data, zd->rxdata+i+6, 6);
            cev = iwe_stream_add_event(cev, end_buf, &iwe, IW_EV_ADDR_LEN);

            iwe.cmd = SIOCGIWESSID;
            iwe.u.data.length = zd->rxdata[i+16];
            iwe.u.data.flags = 1;
            cev = iwe_stream_add_point(cev, end_buf, &iwe, zd->rxdata+i+18);

            iwe.cmd = SIOCGIWMODE;
            if (zd->rxdata[i+14]&0x01)
                  iwe.u.mode = IW_MODE_MASTER;
            else
                  iwe.u.mode = IW_MODE_ADHOC;
            cev = iwe_stream_add_event(cev, end_buf, &iwe, IW_EV_UINT_LEN);
            
            iwe.cmd = SIOCGIWFREQ;
            iwe.u.freq.m = zd->rxdata[i+0];
            iwe.u.freq.e = 0;
            cev = iwe_stream_add_event(cev, end_buf, &iwe, IW_EV_FREQ_LEN);
            
            iwe.cmd = SIOCGIWRATE;
            iwe.u.bitrate.fixed = 0;
            iwe.u.bitrate.disabled = 0;
            for (j=0; j<10; j++) if (zd->rxdata[i+50+j]) {
                  iwe.u.bitrate.value = (zd->rxdata[i+50+j]&0x7f)*500000;
                  cev=iwe_stream_add_event(cev, end_buf, &iwe,
                      IW_EV_PARAM_LEN);
            }
            
            iwe.cmd = SIOCGIWENCODE;
            iwe.u.data.length = 0;
            if (zd->rxdata[i+14]&0x10)
                  iwe.u.data.flags = IW_ENCODE_ENABLED;
            else
                  iwe.u.data.flags = IW_ENCODE_DISABLED;
            cev = iwe_stream_add_point(cev, end_buf, &iwe, NULL);
            
            iwe.cmd = IWEVQUAL;
            iwe.u.qual.qual = zd->rxdata[i+4];
            iwe.u.qual.noise= zd->rxdata[i+2]/10-100;
            iwe.u.qual.level = (256+zd->rxdata[i+4]*100)/255-100;
            iwe.u.qual.updated = 7;
            cev = iwe_stream_add_event(cev, end_buf, &iwe, IW_EV_QUAL_LEN);
      }

      if (!enabled_save)
            zd1201_disable(zd);

      srq->length = cev - extra;
      srq->flags = 0;

      return 0;
}

static int zd1201_set_essid(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *data, char *essid)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;

      if (data->length > IW_ESSID_MAX_SIZE)
            return -EINVAL;
      if (data->length < 1)
            data->length = 1;
      zd->essidlen = data->length;
      memset(zd->essid, 0, IW_ESSID_MAX_SIZE+1);
      memcpy(zd->essid, essid, data->length);
      return zd1201_join(zd, zd->essid, zd->essidlen);
}

static int zd1201_get_essid(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *data, char *essid)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;

      memcpy(essid, zd->essid, zd->essidlen);
      data->flags = 1;
      data->length = zd->essidlen;

      return 0;
}

static int zd1201_get_nick(struct net_device *dev, struct iw_request_info *info,
    struct iw_point *data, char *nick)
{
      strcpy(nick, "zd1201");
      data->flags = 1;
      data->length = strlen(nick);
      return 0;
}

static int zd1201_set_rate(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short rate;
      int err;

      switch (rrq->value) {
            case 1000000:
                  rate = ZD1201_RATEB1;
                  break;
            case 2000000:
                  rate = ZD1201_RATEB2;
                  break;
            case 5500000:
                  rate = ZD1201_RATEB5;
                  break;
            case 11000000:
            default:
                  rate = ZD1201_RATEB11;
                  break;
      }
      if (!rrq->fixed) { /* Also enable all lower bitrates */
            rate |= rate-1;
      }

      err = zd1201_setconfig16(zd, ZD1201_RID_TXRATECNTL, rate);
      if (err)
            return err;

      return zd1201_mac_reset(zd);
}

static int zd1201_get_rate(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short rate;
      int err;

      err = zd1201_getconfig16(zd, ZD1201_RID_CURRENTTXRATE, &rate);
      if (err)
            return err;

      switch(rate) {
            case 1:
                  rrq->value = 1000000;
                  break;
            case 2:
                  rrq->value = 2000000;
                  break;
            case 5:
                  rrq->value = 5500000;
                  break;
            case 11:
                  rrq->value = 11000000;
                  break;
            default:
                  rrq->value = 0;
      }
      rrq->fixed = 0;
      rrq->disabled = 0;

      return 0;
}

static int zd1201_set_rts(struct net_device *dev, struct iw_request_info *info,
    struct iw_param *rts, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      int err;
      short val = rts->value;

      if (rts->disabled || !rts->fixed)
            val = ZD1201_RTSMAX;
      if (val > ZD1201_RTSMAX)
            return -EINVAL;
      if (val < 0)
            return -EINVAL;

      err = zd1201_setconfig16(zd, ZD1201_RID_CNFRTSTHRESHOLD, val);
      if (err)
            return err;
      return zd1201_mac_reset(zd);
}

static int zd1201_get_rts(struct net_device *dev, struct iw_request_info *info,
    struct iw_param *rts, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short rtst;
      int err;

      err = zd1201_getconfig16(zd, ZD1201_RID_CNFRTSTHRESHOLD, &rtst);
      if (err)
            return err;
      rts->value = rtst;
      rts->disabled = (rts->value == ZD1201_RTSMAX);
      rts->fixed = 1;

      return 0;
}

static int zd1201_set_frag(struct net_device *dev, struct iw_request_info *info,
    struct iw_param *frag, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      int err;
      short val = frag->value;

      if (frag->disabled || !frag->fixed)
            val = ZD1201_FRAGMAX;
      if (val > ZD1201_FRAGMAX)
            return -EINVAL;
      if (val < ZD1201_FRAGMIN)
            return -EINVAL;
      if (val & 1)
            return -EINVAL;
      err = zd1201_setconfig16(zd, ZD1201_RID_CNFFRAGTHRESHOLD, val);
      if (err)
            return err;
      return zd1201_mac_reset(zd);
}

static int zd1201_get_frag(struct net_device *dev, struct iw_request_info *info,
    struct iw_param *frag, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short fragt;
      int err;

      err = zd1201_getconfig16(zd, ZD1201_RID_CNFFRAGTHRESHOLD, &fragt);
      if (err)
            return err;
      frag->value = fragt;
      frag->disabled = (frag->value == ZD1201_FRAGMAX);
      frag->fixed = 1;

      return 0;
}

static int zd1201_set_retry(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
      return 0;
}

static int zd1201_get_retry(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
      return 0;
}

static int zd1201_set_encode(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *erq, char *key)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short i;
      int err, rid;

      if (erq->length > ZD1201_MAXKEYLEN)
            return -EINVAL;

      i = (erq->flags & IW_ENCODE_INDEX)-1;
      if (i == -1) {
            err = zd1201_getconfig16(zd,ZD1201_RID_CNFDEFAULTKEYID,&i);
            if (err)
                  return err;
      } else {
            err = zd1201_setconfig16(zd, ZD1201_RID_CNFDEFAULTKEYID, i);
            if (err)
                  return err;
      }

      if (i < 0 || i >= ZD1201_NUMKEYS)
            return -EINVAL;

      rid = ZD1201_RID_CNFDEFAULTKEY0 + i;
      err = zd1201_setconfig(zd, rid, key, erq->length, 1);
      if (err)
            return err;
      zd->encode_keylen[i] = erq->length;
      memcpy(zd->encode_keys[i], key, erq->length);

      i=0;
      if (!(erq->flags & IW_ENCODE_DISABLED & IW_ENCODE_MODE)) {
            i |= 0x01;
            zd->encode_enabled = 1;
      } else
            zd->encode_enabled = 0;
      if (erq->flags & IW_ENCODE_RESTRICTED & IW_ENCODE_MODE) {
            i |= 0x02;
            zd->encode_restricted = 1;
      } else
            zd->encode_restricted = 0;
      err = zd1201_setconfig16(zd, ZD1201_RID_CNFWEBFLAGS, i);
      if (err)
            return err;

      if (zd->encode_enabled)
            i = ZD1201_CNFAUTHENTICATION_SHAREDKEY;
      else
            i = ZD1201_CNFAUTHENTICATION_OPENSYSTEM;
      err = zd1201_setconfig16(zd, ZD1201_RID_CNFAUTHENTICATION, i);
      if (err)
            return err;

      return zd1201_mac_reset(zd);
}

static int zd1201_get_encode(struct net_device *dev,
    struct iw_request_info *info, struct iw_point *erq, char *key)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short i;
      int err;

      if (zd->encode_enabled)
            erq->flags = IW_ENCODE_ENABLED;
      else
            erq->flags = IW_ENCODE_DISABLED;
      if (zd->encode_restricted)
            erq->flags |= IW_ENCODE_RESTRICTED;
      else
            erq->flags |= IW_ENCODE_OPEN;

      i = (erq->flags & IW_ENCODE_INDEX) -1;
      if (i == -1) {
            err = zd1201_getconfig16(zd, ZD1201_RID_CNFDEFAULTKEYID, &i);
            if (err)
                  return err;
      }
      if (i<0 || i>= ZD1201_NUMKEYS)
            return -EINVAL;

      erq->flags |= i+1;

      erq->length = zd->encode_keylen[i];
      memcpy(key, zd->encode_keys[i], erq->length);

      return 0;
}

static int zd1201_set_power(struct net_device *dev, 
    struct iw_request_info *info, struct iw_param *vwrq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short enabled, duration, level;
      int err;

      enabled = vwrq->disabled ? 0 : 1;
      if (enabled) {
            if (vwrq->flags & IW_POWER_PERIOD) {
                  duration = vwrq->value;
                  err = zd1201_setconfig16(zd, 
                      ZD1201_RID_CNFMAXSLEEPDURATION, duration);
                  if (err)
                        return err;
                  goto out;
            }
            if (vwrq->flags & IW_POWER_TIMEOUT) {
                  err = zd1201_getconfig16(zd, 
                      ZD1201_RID_CNFMAXSLEEPDURATION, &duration);
                  if (err)
                        return err;
                  level = vwrq->value * 4 / duration;
                  if (level > 4)
                        level = 4;
                  if (level < 0)
                        level = 0;
                  err = zd1201_setconfig16(zd, ZD1201_RID_CNFPMEPS,
                      level);
                  if (err)
                        return err;
                  goto out;
            }
            return -EINVAL;
      }
out:
      return zd1201_setconfig16(zd, ZD1201_RID_CNFPMENABLED, enabled);
}

static int zd1201_get_power(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *vwrq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short enabled, level, duration;
      int err;

      err = zd1201_getconfig16(zd, ZD1201_RID_CNFPMENABLED, &enabled);
      if (err)
            return err;
      err = zd1201_getconfig16(zd, ZD1201_RID_CNFPMEPS, &level);
      if (err)
            return err;
      err = zd1201_getconfig16(zd, ZD1201_RID_CNFMAXSLEEPDURATION, &duration);
      if (err)
            return err;
      vwrq->disabled = enabled ? 0 : 1;
      if (vwrq->flags & IW_POWER_TYPE) {
            if (vwrq->flags & IW_POWER_PERIOD) {
                  vwrq->value = duration;
                  vwrq->flags = IW_POWER_PERIOD;
            } else {
                  vwrq->value = duration * level / 4;
                  vwrq->flags = IW_POWER_TIMEOUT;
            }
      }
      if (vwrq->flags & IW_POWER_MODE) {
            if (enabled && level)
                  vwrq->flags = IW_POWER_UNICAST_R;
            else
                  vwrq->flags = IW_POWER_ALL_R;
      }

      return 0;
}


static const iw_handler zd1201_iw_handler[] =
{
      (iw_handler) zd1201_config_commit,  /* SIOCSIWCOMMIT */
      (iw_handler) zd1201_get_name,       /* SIOCGIWNAME */
      (iw_handler) NULL,                  /* SIOCSIWNWID */
      (iw_handler) NULL,                  /* SIOCGIWNWID */
      (iw_handler) zd1201_set_freq,       /* SIOCSIWFREQ */
      (iw_handler) zd1201_get_freq,       /* SIOCGIWFREQ */
      (iw_handler) zd1201_set_mode,       /* SIOCSIWMODE */
      (iw_handler) zd1201_get_mode,       /* SIOCGIWMODE */
      (iw_handler) NULL,                        /* SIOCSIWSENS */
      (iw_handler) NULL,                  /* SIOCGIWSENS */
      (iw_handler) NULL,                  /* SIOCSIWRANGE */
      (iw_handler) zd1201_get_range,           /* SIOCGIWRANGE */
      (iw_handler) NULL,                  /* SIOCSIWPRIV */
      (iw_handler) NULL,                  /* SIOCGIWPRIV */
      (iw_handler) NULL,                  /* SIOCSIWSTATS */
      (iw_handler) NULL,                  /* SIOCGIWSTATS */
      (iw_handler) NULL,                  /* SIOCSIWSPY */
      (iw_handler) NULL,                  /* SIOCGIWSPY */
      (iw_handler) NULL,                  /* -- hole -- */
      (iw_handler) NULL,                  /* -- hole -- */
      (iw_handler) NULL/*zd1201_set_wap*/,            /* SIOCSIWAP */
      (iw_handler) zd1201_get_wap,        /* SIOCGIWAP */
      (iw_handler) NULL,                  /* -- hole -- */
      (iw_handler) NULL,                  /* SIOCGIWAPLIST */
      (iw_handler) zd1201_set_scan,       /* SIOCSIWSCAN */
      (iw_handler) zd1201_get_scan,       /* SIOCGIWSCAN */
      (iw_handler) zd1201_set_essid,            /* SIOCSIWESSID */
      (iw_handler) zd1201_get_essid,            /* SIOCGIWESSID */
      (iw_handler) NULL,                  /* SIOCSIWNICKN */
      (iw_handler) zd1201_get_nick,             /* SIOCGIWNICKN */
      (iw_handler) NULL,                  /* -- hole -- */
      (iw_handler) NULL,                  /* -- hole -- */
      (iw_handler) zd1201_set_rate,       /* SIOCSIWRATE */
      (iw_handler) zd1201_get_rate,       /* SIOCGIWRATE */
      (iw_handler) zd1201_set_rts,        /* SIOCSIWRTS */
      (iw_handler) zd1201_get_rts,        /* SIOCGIWRTS */
      (iw_handler) zd1201_set_frag,       /* SIOCSIWFRAG */
      (iw_handler) zd1201_get_frag,       /* SIOCGIWFRAG */
      (iw_handler) NULL,                  /* SIOCSIWTXPOW */
      (iw_handler) NULL,                  /* SIOCGIWTXPOW */
      (iw_handler) zd1201_set_retry,            /* SIOCSIWRETRY */
      (iw_handler) zd1201_get_retry,            /* SIOCGIWRETRY */
      (iw_handler) zd1201_set_encode,           /* SIOCSIWENCODE */
      (iw_handler) zd1201_get_encode,           /* SIOCGIWENCODE */
      (iw_handler) zd1201_set_power,            /* SIOCSIWPOWER */
      (iw_handler) zd1201_get_power,            /* SIOCGIWPOWER */
};

static int zd1201_set_hostauth(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;

      if (!zd->ap)
            return -EOPNOTSUPP;

      return zd1201_setconfig16(zd, ZD1201_RID_CNFHOSTAUTH, rrq->value);
}

static int zd1201_get_hostauth(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short hostauth;
      int err;

      if (!zd->ap)
            return -EOPNOTSUPP;

      err = zd1201_getconfig16(zd, ZD1201_RID_CNFHOSTAUTH, &hostauth);
      if (err)
            return err;
      rrq->value = hostauth;
      rrq->fixed = 1;

      return 0;
}

static int zd1201_auth_sta(struct net_device *dev,
    struct iw_request_info *info, struct sockaddr *sta, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      unsigned char buffer[10];

      if (!zd->ap)
            return -EOPNOTSUPP;

      memcpy(buffer, sta->sa_data, ETH_ALEN);
      *(short*)(buffer+6) = 0;      /* 0==success, 1==failure */
      *(short*)(buffer+8) = 0;

      return zd1201_setconfig(zd, ZD1201_RID_AUTHENTICATESTA, buffer, 10, 1);
}

static int zd1201_set_maxassoc(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      int err;

      if (!zd->ap)
            return -EOPNOTSUPP;

      err = zd1201_setconfig16(zd, ZD1201_RID_CNFMAXASSOCSTATIONS, rrq->value);
      if (err)
            return err;
      return 0;
}

static int zd1201_get_maxassoc(struct net_device *dev,
    struct iw_request_info *info, struct iw_param *rrq, char *extra)
{
      struct zd1201 *zd = (struct zd1201 *)dev->priv;
      short maxassoc;
      int err;

      if (!zd->ap)
            return -EOPNOTSUPP;

      err = zd1201_getconfig16(zd, ZD1201_RID_CNFMAXASSOCSTATIONS, &maxassoc);
      if (err)
            return err;
      rrq->value = maxassoc;
      rrq->fixed = 1;

      return 0;
}

static const iw_handler zd1201_private_handler[] = {
      (iw_handler) zd1201_set_hostauth,   /* ZD1201SIWHOSTAUTH */
      (iw_handler) zd1201_get_hostauth,   /* ZD1201GIWHOSTAUTH */
      (iw_handler) zd1201_auth_sta,       /* ZD1201SIWAUTHSTA */
      (iw_handler) NULL,                  /* nothing to get */
      (iw_handler) zd1201_set_maxassoc,   /* ZD1201SIMAXASSOC */
      (iw_handler) zd1201_get_maxassoc,   /* ZD1201GIMAXASSOC */
};

static const struct iw_priv_args zd1201_private_args[] = {
      { ZD1201SIWHOSTAUTH, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1,
          IW_PRIV_TYPE_NONE, "sethostauth" },
      { ZD1201GIWHOSTAUTH, IW_PRIV_TYPE_NONE,
          IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "gethostauth" },
      { ZD1201SIWAUTHSTA, IW_PRIV_TYPE_ADDR | IW_PRIV_SIZE_FIXED | 1,
          IW_PRIV_TYPE_NONE, "authstation" },
      { ZD1201SIWMAXASSOC, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1,
          IW_PRIV_TYPE_NONE, "setmaxassoc" },
      { ZD1201GIWMAXASSOC, IW_PRIV_TYPE_NONE,
          IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "getmaxassoc" },
};

static const struct iw_handler_def zd1201_iw_handlers = {
      .num_standard           = ARRAY_SIZE(zd1201_iw_handler),
      .num_private            = ARRAY_SIZE(zd1201_private_handler),
      .num_private_args       = ARRAY_SIZE(zd1201_private_args),
      .standard         = (iw_handler *)zd1201_iw_handler,
      .private          = (iw_handler *)zd1201_private_handler,
      .private_args           = (struct iw_priv_args *) zd1201_private_args,
      .get_wireless_stats     = zd1201_get_wireless_stats,
};

static int zd1201_probe(struct usb_interface *interface,
                  const struct usb_device_id *id)
{
      struct zd1201 *zd;
      struct usb_device *usb;
      int err;
      short porttype;
      char buf[IW_ESSID_MAX_SIZE+2];

      usb = interface_to_usbdev(interface);

      zd = kzalloc(sizeof(struct zd1201), GFP_KERNEL);
      if (!zd)
            return -ENOMEM;
      zd->ap = ap;
      zd->usb = usb;
      zd->removed = 0;
      init_waitqueue_head(&zd->rxdataq);
      INIT_HLIST_HEAD(&zd->fraglist);
      
      err = zd1201_fw_upload(usb, zd->ap);
      if (err) {
            dev_err(&usb->dev, "zd1201 firmware upload failed: %d\n", err);
            goto err_zd;
      }
      
      zd->endp_in = 1;
      zd->endp_out = 1;
      zd->endp_out2 = 2;
      zd->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
      zd->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!zd->rx_urb || !zd->tx_urb)
            goto err_zd;

      mdelay(100);
      err = zd1201_drvr_start(zd);
      if (err)
            goto err_zd;

      err = zd1201_setconfig16(zd, ZD1201_RID_CNFMAXDATALEN, 2312);
      if (err)
            goto err_start;

      err = zd1201_setconfig16(zd, ZD1201_RID_TXRATECNTL,
          ZD1201_RATEB1 | ZD1201_RATEB2 | ZD1201_RATEB5 | ZD1201_RATEB11);
      if (err)
            goto err_start;

      zd->dev = alloc_etherdev(0);
      if (!zd->dev)
            goto err_start;

      zd->dev->priv = zd;
      zd->dev->open = zd1201_net_open;
      zd->dev->stop = zd1201_net_stop;
      zd->dev->get_stats = zd1201_get_stats;
      zd->dev->wireless_handlers =
          (struct iw_handler_def *)&zd1201_iw_handlers;
      zd->dev->hard_start_xmit = zd1201_hard_start_xmit;
      zd->dev->watchdog_timeo = ZD1201_TX_TIMEOUT;
      zd->dev->tx_timeout = zd1201_tx_timeout;
      zd->dev->set_multicast_list = zd1201_set_multicast;
      zd->dev->set_mac_address = zd1201_set_mac_address;
      strcpy(zd->dev->name, "wlan%d");

      err = zd1201_getconfig(zd, ZD1201_RID_CNFOWNMACADDR, 
          zd->dev->dev_addr, zd->dev->addr_len);
      if (err)
            goto err_net;

      /* Set wildcard essid to match zd->essid */
      *(__le16 *)buf = cpu_to_le16(0);
      err = zd1201_setconfig(zd, ZD1201_RID_CNFDESIREDSSID, buf,
          IW_ESSID_MAX_SIZE+2, 1);
      if (err)
            goto err_net;

      if (zd->ap)
            porttype = ZD1201_PORTTYPE_AP;
      else
            porttype = ZD1201_PORTTYPE_BSS;
      err = zd1201_setconfig16(zd, ZD1201_RID_CNFPORTTYPE, porttype);
      if (err)
            goto err_net;

      SET_NETDEV_DEV(zd->dev, &usb->dev);

      err = register_netdev(zd->dev);
      if (err)
            goto err_net;
      dev_info(&usb->dev, "%s: ZD1201 USB Wireless interface\n",
          zd->dev->name);

      usb_set_intfdata(interface, zd);
      zd1201_enable(zd);      /* zd1201 likes to startup enabled, */
      zd1201_disable(zd);     /* interfering with all the wifis in range */
      return 0;

err_net:
      free_netdev(zd->dev);
err_start:
      /* Leave the device in reset state */
      zd1201_docmd(zd, ZD1201_CMDCODE_INIT, 0, 0, 0);
err_zd:
      usb_free_urb(zd->tx_urb);
      usb_free_urb(zd->rx_urb);
      kfree(zd);
      return err;
}

static void zd1201_disconnect(struct usb_interface *interface)
{
      struct zd1201 *zd=(struct zd1201 *)usb_get_intfdata(interface);
      struct hlist_node *node, *node2;
      struct zd1201_frag *frag;

      if (!zd)
            return;
      usb_set_intfdata(interface, NULL);
      if (zd->dev) {
            unregister_netdev(zd->dev);
            free_netdev(zd->dev);
      }

      hlist_for_each_entry_safe(frag, node, node2, &zd->fraglist, fnode) {
            hlist_del_init(&frag->fnode);
            kfree_skb(frag->skb);
            kfree(frag);
      }

      if (zd->tx_urb) {
            usb_kill_urb(zd->tx_urb);
            usb_free_urb(zd->tx_urb);
      }
      if (zd->rx_urb) {
            usb_kill_urb(zd->rx_urb);
            usb_free_urb(zd->rx_urb);
      }
      kfree(zd);
}

#ifdef CONFIG_PM

static int zd1201_suspend(struct usb_interface *interface,
                     pm_message_t message)
{
      struct zd1201 *zd = usb_get_intfdata(interface);

      netif_device_detach(zd->dev);

      zd->was_enabled = zd->mac_enabled;

      if (zd->was_enabled)
            return zd1201_disable(zd);
      else
            return 0;
}

static int zd1201_resume(struct usb_interface *interface)
{
      struct zd1201 *zd = usb_get_intfdata(interface);

      if (!zd || !zd->dev)
            return -ENODEV;

      netif_device_attach(zd->dev);

      if (zd->was_enabled)
            return zd1201_enable(zd);
      else
            return 0;
}

#else

#define zd1201_suspend NULL
#define zd1201_resume  NULL

#endif

static struct usb_driver zd1201_usb = {
      .name = "zd1201",
      .probe = zd1201_probe,
      .disconnect = zd1201_disconnect,
      .id_table = zd1201_table,
      .suspend = zd1201_suspend,
      .resume = zd1201_resume,
};

static int __init zd1201_init(void)
{
      return usb_register(&zd1201_usb);
}

static void __exit zd1201_cleanup(void)
{
      usb_deregister(&zd1201_usb);
}

module_init(zd1201_init);
module_exit(zd1201_cleanup);

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