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at76c50x-usb.c

/*
 * at76c503/at76c505 USB driver
 *
 * Copyright (c) 2002 - 2003 Oliver Kurth
 * Copyright (c) 2004 Joerg Albert <joerg.albert@gmx.de>
 * Copyright (c) 2004 Nick Jones
 * Copyright (c) 2004 Balint Seeber <n0_5p4m_p13453@hotmail.com>
 * Copyright (c) 2007 Guido Guenther <agx@sigxcpu.org>
 * Copyright (c) 2007 Kalle Valo <kalle.valo@iki.fi>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This file is part of the Berlios driver for WLAN USB devices based on the
 * Atmel AT76C503A/505/505A.
 *
 * Some iw_handler code was taken from airo.c, (C) 1999 Benjamin Reed
 *
 * TODO list is at the wiki:
 *
 * http://wireless.kernel.org/en/users/Drivers/at76c50x-usb#TODO
 *
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/wireless.h>
#include <net/iw_handler.h>
#include <net/ieee80211_radiotap.h>
#include <linux/firmware.h>
#include <linux/leds.h>
#include <net/mac80211.h>

#include "at76c50x-usb.h"

/* Version information */
#define DRIVER_NAME "at76c50x-usb"
#define DRIVER_VERSION  "0.17"
#define DRIVER_DESC "Atmel at76x USB Wireless LAN Driver"

/* at76_debug bits */
#define DBG_PROGRESS          0x00000001  /* authentication/accociation */
#define DBG_BSS_TABLE         0x00000002  /* show BSS table after scans */
#define DBG_IOCTL       0x00000004  /* ioctl calls / settings */
#define DBG_MAC_STATE         0x00000008  /* MAC state transitions */
#define DBG_TX_DATA           0x00000010  /* tx header */
#define DBG_TX_DATA_CONTENT   0x00000020  /* tx content */
#define DBG_TX_MGMT           0x00000040  /* tx management */
#define DBG_RX_DATA           0x00000080  /* rx data header */
#define DBG_RX_DATA_CONTENT   0x00000100  /* rx data content */
#define DBG_RX_MGMT           0x00000200  /* rx mgmt frame headers */
#define DBG_RX_BEACON         0x00000400  /* rx beacon */
#define DBG_RX_CTRL           0x00000800  /* rx control */
#define DBG_RX_MGMT_CONTENT   0x00001000  /* rx mgmt content */
#define DBG_RX_FRAGS          0x00002000  /* rx data fragment handling */
#define DBG_DEVSTART          0x00004000  /* fw download, device start */
#define DBG_URB               0x00008000  /* rx urb status, ... */
#define DBG_RX_ATMEL_HDR      0x00010000  /* Atmel-specific Rx headers */
#define DBG_PROC_ENTRY        0x00020000  /* procedure entries/exits */
#define DBG_PM                0x00040000  /* power management settings */
#define DBG_BSS_MATCH         0x00080000  /* BSS match failures */
#define DBG_PARAMS            0x00100000  /* show configured parameters */
#define DBG_WAIT_COMPLETE     0x00200000  /* command completion */
#define DBG_RX_FRAGS_SKB      0x00400000  /* skb header of Rx fragments */
#define DBG_BSS_TABLE_RM      0x00800000  /* purging bss table entries */
#define DBG_MONITOR_MODE      0x01000000  /* monitor mode */
#define DBG_MIB               0x02000000  /* dump all MIBs on startup */
#define DBG_MGMT_TIMER        0x04000000  /* dump mgmt_timer ops */
#define DBG_WE_EVENTS         0x08000000  /* dump wireless events */
#define DBG_FW                0x10000000  /* firmware download */
#define DBG_DFU               0x20000000  /* device firmware upgrade */
#define DBG_CMD               0x40000000
#define DBG_MAC80211          0x80000000

#define DBG_DEFAULTS          0

/* Use our own dbg macro */
#define at76_dbg(bits, format, arg...) \
      do { \
            if (at76_debug & (bits))                         \
                  printk(KERN_DEBUG DRIVER_NAME ": " format "\n" , \
                         ## arg);                            \
      } while (0)

#define at76_dbg_dump(bits, buf, len, format, arg...) \
      do { \
            if (at76_debug & (bits)) { \
                  printk(KERN_DEBUG DRIVER_NAME ": " format "\n" , \
                         ## arg);                            \
                  print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,     \
                                   buf, len);                \
            }                                          \
      } while (0)

static uint at76_debug = DBG_DEFAULTS;

/* Protect against concurrent firmware loading and parsing */
static struct mutex fw_mutex;

static struct fwentry firmwares[] = {
      [0] = { "" },
      [BOARD_503_ISL3861] = { "atmel_at76c503-i3861.bin" },
      [BOARD_503_ISL3863] = { "atmel_at76c503-i3863.bin" },
      [BOARD_503] = { "atmel_at76c503-rfmd.bin" },
      [BOARD_503_ACC] = { "atmel_at76c503-rfmd-acc.bin" },
      [BOARD_505] = { "atmel_at76c505-rfmd.bin" },
      [BOARD_505_2958] = { "atmel_at76c505-rfmd2958.bin" },
      [BOARD_505A] = { "atmel_at76c505a-rfmd2958.bin" },
      [BOARD_505AMX] = { "atmel_at76c505amx-rfmd.bin" },
};

#define USB_DEVICE_DATA(__ops)      .driver_info = (kernel_ulong_t)(__ops)

static struct usb_device_id dev_table[] = {
      /*
       * at76c503-i3861
       */
      /* Generic AT76C503/3861 device */
      { USB_DEVICE(0x03eb, 0x7603), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Linksys WUSB11 v2.1/v2.6 */
      { USB_DEVICE(0x066b, 0x2211), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Netgear MA101 rev. A */
      { USB_DEVICE(0x0864, 0x4100), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Tekram U300C / Allnet ALL0193 */
      { USB_DEVICE(0x0b3b, 0x1612), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* HP HN210W J7801A */
      { USB_DEVICE(0x03f0, 0x011c), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Sitecom/Z-Com/Zyxel M4Y-750 */
      { USB_DEVICE(0x0cde, 0x0001), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Dynalink/Askey WLL013 (intersil) */
      { USB_DEVICE(0x069a, 0x0320), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* EZ connect 11Mpbs Wireless USB Adapter SMC2662W v1 */
      { USB_DEVICE(0x0d5c, 0xa001), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* BenQ AWL300 */
      { USB_DEVICE(0x04a5, 0x9000), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Addtron AWU-120, Compex WLU11 */
      { USB_DEVICE(0x05dd, 0xff31), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Intel AP310 AnyPoint II USB */
      { USB_DEVICE(0x8086, 0x0200), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Dynalink L11U */
      { USB_DEVICE(0x0d8e, 0x7100), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* Arescom WL-210, FCC id 07J-GL2411USB */
      { USB_DEVICE(0x0d8e, 0x7110), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* I-O DATA WN-B11/USB */
      { USB_DEVICE(0x04bb, 0x0919), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /* BT Voyager 1010 */
      { USB_DEVICE(0x069a, 0x0821), USB_DEVICE_DATA(BOARD_503_ISL3861) },
      /*
       * at76c503-i3863
       */
      /* Generic AT76C503/3863 device */
      { USB_DEVICE(0x03eb, 0x7604), USB_DEVICE_DATA(BOARD_503_ISL3863) },
      /* Samsung SWL-2100U */
      { USB_DEVICE(0x055d, 0xa000), USB_DEVICE_DATA(BOARD_503_ISL3863) },
      /*
       * at76c503-rfmd
       */
      /* Generic AT76C503/RFMD device */
      { USB_DEVICE(0x03eb, 0x7605), USB_DEVICE_DATA(BOARD_503) },
      /* Dynalink/Askey WLL013 (rfmd) */
      { USB_DEVICE(0x069a, 0x0321), USB_DEVICE_DATA(BOARD_503) },
      /* Linksys WUSB11 v2.6 */
      { USB_DEVICE(0x077b, 0x2219), USB_DEVICE_DATA(BOARD_503) },
      /* Network Everywhere NWU11B */
      { USB_DEVICE(0x077b, 0x2227), USB_DEVICE_DATA(BOARD_503) },
      /* Netgear MA101 rev. B */
      { USB_DEVICE(0x0864, 0x4102), USB_DEVICE_DATA(BOARD_503) },
      /* D-Link DWL-120 rev. E */
      { USB_DEVICE(0x2001, 0x3200), USB_DEVICE_DATA(BOARD_503) },
      /* Actiontec 802UAT1, HWU01150-01UK */
      { USB_DEVICE(0x1668, 0x7605), USB_DEVICE_DATA(BOARD_503) },
      /* AirVast W-Buddie WN210 */
      { USB_DEVICE(0x03eb, 0x4102), USB_DEVICE_DATA(BOARD_503) },
      /* Dick Smith Electronics XH1153 802.11b USB adapter */
      { USB_DEVICE(0x1371, 0x5743), USB_DEVICE_DATA(BOARD_503) },
      /* CNet CNUSB611 */
      { USB_DEVICE(0x1371, 0x0001), USB_DEVICE_DATA(BOARD_503) },
      /* FiberLine FL-WL200U */
      { USB_DEVICE(0x1371, 0x0002), USB_DEVICE_DATA(BOARD_503) },
      /* BenQ AWL400 USB stick */
      { USB_DEVICE(0x04a5, 0x9001), USB_DEVICE_DATA(BOARD_503) },
      /* 3Com 3CRSHEW696 */
      { USB_DEVICE(0x0506, 0x0a01), USB_DEVICE_DATA(BOARD_503) },
      /* Siemens Santis ADSL WLAN USB adapter WLL 013 */
      { USB_DEVICE(0x0681, 0x001b), USB_DEVICE_DATA(BOARD_503) },
      /* Belkin F5D6050, version 2 */
      { USB_DEVICE(0x050d, 0x0050), USB_DEVICE_DATA(BOARD_503) },
      /* iBlitzz, BWU613 (not *B or *SB) */
      { USB_DEVICE(0x07b8, 0xb000), USB_DEVICE_DATA(BOARD_503) },
      /* Gigabyte GN-WLBM101 */
      { USB_DEVICE(0x1044, 0x8003), USB_DEVICE_DATA(BOARD_503) },
      /* Planex GW-US11S */
      { USB_DEVICE(0x2019, 0x3220), USB_DEVICE_DATA(BOARD_503) },
      /* Internal WLAN adapter in h5[4,5]xx series iPAQs */
      { USB_DEVICE(0x049f, 0x0032), USB_DEVICE_DATA(BOARD_503) },
      /* Corega Wireless LAN USB-11 mini */
      { USB_DEVICE(0x07aa, 0x0011), USB_DEVICE_DATA(BOARD_503) },
      /* Corega Wireless LAN USB-11 mini2 */
      { USB_DEVICE(0x07aa, 0x0018), USB_DEVICE_DATA(BOARD_503) },
      /* Uniden PCW100 */
      { USB_DEVICE(0x05dd, 0xff35), USB_DEVICE_DATA(BOARD_503) },
      /*
       * at76c503-rfmd-acc
       */
      /* SMC2664W */
      { USB_DEVICE(0x083a, 0x3501), USB_DEVICE_DATA(BOARD_503_ACC) },
      /* Belkin F5D6050, SMC2662W v2, SMC2662W-AR */
      { USB_DEVICE(0x0d5c, 0xa002), USB_DEVICE_DATA(BOARD_503_ACC) },
      /*
       * at76c505-rfmd
       */
      /* Generic AT76C505/RFMD */
      { USB_DEVICE(0x03eb, 0x7606), USB_DEVICE_DATA(BOARD_505) },
      /*
       * at76c505-rfmd2958
       */
      /* Generic AT76C505/RFMD, OvisLink WL-1130USB */
      { USB_DEVICE(0x03eb, 0x7613), USB_DEVICE_DATA(BOARD_505_2958) },
      /* Fiberline FL-WL240U */
      { USB_DEVICE(0x1371, 0x0014), USB_DEVICE_DATA(BOARD_505_2958) },
      /* CNet CNUSB-611G */
      { USB_DEVICE(0x1371, 0x0013), USB_DEVICE_DATA(BOARD_505_2958) },
      /* Linksys WUSB11 v2.8 */
      { USB_DEVICE(0x1915, 0x2233), USB_DEVICE_DATA(BOARD_505_2958) },
      /* Xterasys XN-2122B, IBlitzz BWU613B/BWU613SB */
      { USB_DEVICE(0x12fd, 0x1001), USB_DEVICE_DATA(BOARD_505_2958) },
      /* Corega WLAN USB Stick 11 */
      { USB_DEVICE(0x07aa, 0x7613), USB_DEVICE_DATA(BOARD_505_2958) },
      /* Microstar MSI Box MS6978 */
      { USB_DEVICE(0x0db0, 0x1020), USB_DEVICE_DATA(BOARD_505_2958) },
      /*
       * at76c505a-rfmd2958
       */
      /* Generic AT76C505A device */
      { USB_DEVICE(0x03eb, 0x7614), USB_DEVICE_DATA(BOARD_505A) },
      /* Generic AT76C505AS device */
      { USB_DEVICE(0x03eb, 0x7617), USB_DEVICE_DATA(BOARD_505A) },
      /* Siemens Gigaset USB WLAN Adapter 11 */
      { USB_DEVICE(0x1690, 0x0701), USB_DEVICE_DATA(BOARD_505A) },
      /* OQO Model 01+ Internal Wi-Fi */
      { USB_DEVICE(0x1557, 0x0002), USB_DEVICE_DATA(BOARD_505A) },
      /*
       * at76c505amx-rfmd
       */
      /* Generic AT76C505AMX device */
      { USB_DEVICE(0x03eb, 0x7615), USB_DEVICE_DATA(BOARD_505AMX) },
      { }
};

MODULE_DEVICE_TABLE(usb, dev_table);

/* Supported rates of this hardware, bit 7 marks basic rates */
static const u8 hw_rates[] = { 0x82, 0x84, 0x0b, 0x16 };

static const char *const preambles[] = { "long", "short", "auto" };

/* Firmware download */
/* DFU states */
#define STATE_IDLE                  0x00
#define STATE_DETACH                0x01
#define STATE_DFU_IDLE              0x02
#define STATE_DFU_DOWNLOAD_SYNC           0x03
#define STATE_DFU_DOWNLOAD_BUSY           0x04
#define STATE_DFU_DOWNLOAD_IDLE           0x05
#define STATE_DFU_MANIFEST_SYNC           0x06
#define STATE_DFU_MANIFEST          0x07
#define STATE_DFU_MANIFEST_WAIT_RESET     0x08
#define STATE_DFU_UPLOAD_IDLE       0x09
#define STATE_DFU_ERROR             0x0a

/* DFU commands */
#define DFU_DETACH                  0
#define DFU_DNLOAD                  1
#define DFU_UPLOAD                  2
#define DFU_GETSTATUS               3
#define DFU_CLRSTATUS               4
#define DFU_GETSTATE                5
#define DFU_ABORT             6

#define FW_BLOCK_SIZE 1024

00295 struct dfu_status {
      unsigned char status;
      unsigned char poll_timeout[3];
      unsigned char state;
      unsigned char string;
} __attribute__((packed));

static inline int at76_is_intersil(enum board_type board)
{
      return (board == BOARD_503_ISL3861 || board == BOARD_503_ISL3863);
}

static inline int at76_is_503rfmd(enum board_type board)
{
      return (board == BOARD_503 || board == BOARD_503_ACC);
}

static inline int at76_is_505a(enum board_type board)
{
      return (board == BOARD_505A || board == BOARD_505AMX);
}

/* Load a block of the first (internal) part of the firmware */
static int at76_load_int_fw_block(struct usb_device *udev, int blockno,
                          void *block, int size)
{
      return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), DFU_DNLOAD,
                         USB_TYPE_CLASS | USB_DIR_OUT |
                         USB_RECIP_INTERFACE, blockno, 0, block, size,
                         USB_CTRL_GET_TIMEOUT);
}

static int at76_dfu_get_status(struct usb_device *udev,
                         struct dfu_status *status)
{
      int ret;

      ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), DFU_GETSTATUS,
                        USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
                        0, 0, status, sizeof(struct dfu_status),
                        USB_CTRL_GET_TIMEOUT);
      return ret;
}

static u8 at76_dfu_get_state(struct usb_device *udev, u8 *state)
{
      int ret;

      ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), DFU_GETSTATE,
                        USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
                        0, 0, state, 1, USB_CTRL_GET_TIMEOUT);
      return ret;
}

/* Convert timeout from the DFU status to jiffies */
static inline unsigned long at76_get_timeout(struct dfu_status *s)
{
      return msecs_to_jiffies((s->poll_timeout[2] << 16)
                        | (s->poll_timeout[1] << 8)
                        | (s->poll_timeout[0]));
}

/* Load internal firmware from the buffer.  If manifest_sync_timeout > 0, use
 * its value in jiffies in the MANIFEST_SYNC state.  */
static int at76_usbdfu_download(struct usb_device *udev, u8 *buf, u32 size,
                        int manifest_sync_timeout)
{
      u8 *block;
      struct dfu_status dfu_stat_buf;
      int ret = 0;
      int need_dfu_state = 1;
      int is_done = 0;
      u8 dfu_state = 0;
      u32 dfu_timeout = 0;
      int bsize = 0;
      int blockno = 0;

      at76_dbg(DBG_DFU, "%s( %p, %u, %d)", __func__, buf, size,
             manifest_sync_timeout);

      if (!size) {
            dev_printk(KERN_ERR, &udev->dev, "FW buffer length invalid!\n");
            return -EINVAL;
      }

      block = kmalloc(FW_BLOCK_SIZE, GFP_KERNEL);
      if (!block)
            return -ENOMEM;

      do {
            if (need_dfu_state) {
                  ret = at76_dfu_get_state(udev, &dfu_state);
                  if (ret < 0) {
                        dev_printk(KERN_ERR, &udev->dev,
                                 "cannot get DFU state: %d\n", ret);
                        goto exit;
                  }
                  need_dfu_state = 0;
            }

            switch (dfu_state) {
            case STATE_DFU_DOWNLOAD_SYNC:
                  at76_dbg(DBG_DFU, "STATE_DFU_DOWNLOAD_SYNC");
                  ret = at76_dfu_get_status(udev, &dfu_stat_buf);
                  if (ret >= 0) {
                        dfu_state = dfu_stat_buf.state;
                        dfu_timeout = at76_get_timeout(&dfu_stat_buf);
                        need_dfu_state = 0;
                  } else
                        dev_printk(KERN_ERR, &udev->dev,
                                 "at76_dfu_get_status returned %d\n",
                                 ret);
                  break;

            case STATE_DFU_DOWNLOAD_BUSY:
                  at76_dbg(DBG_DFU, "STATE_DFU_DOWNLOAD_BUSY");
                  need_dfu_state = 1;

                  at76_dbg(DBG_DFU, "DFU: Resetting device");
                  schedule_timeout_interruptible(dfu_timeout);
                  break;

            case STATE_DFU_DOWNLOAD_IDLE:
                  at76_dbg(DBG_DFU, "DOWNLOAD...");
                  /* fall through */
            case STATE_DFU_IDLE:
                  at76_dbg(DBG_DFU, "DFU IDLE");

                  bsize = min_t(int, size, FW_BLOCK_SIZE);
                  memcpy(block, buf, bsize);
                  at76_dbg(DBG_DFU, "int fw, size left = %5d, "
                         "bsize = %4d, blockno = %2d", size, bsize,
                         blockno);
                  ret =
                      at76_load_int_fw_block(udev, blockno, block, bsize);
                  buf += bsize;
                  size -= bsize;
                  blockno++;

                  if (ret != bsize)
                        dev_printk(KERN_ERR, &udev->dev,
                                 "at76_load_int_fw_block "
                                 "returned %d\n", ret);
                  need_dfu_state = 1;
                  break;

            case STATE_DFU_MANIFEST_SYNC:
                  at76_dbg(DBG_DFU, "STATE_DFU_MANIFEST_SYNC");

                  ret = at76_dfu_get_status(udev, &dfu_stat_buf);
                  if (ret < 0)
                        break;

                  dfu_state = dfu_stat_buf.state;
                  dfu_timeout = at76_get_timeout(&dfu_stat_buf);
                  need_dfu_state = 0;

                  /* override the timeout from the status response,
                     needed for AT76C505A */
                  if (manifest_sync_timeout > 0)
                        dfu_timeout = manifest_sync_timeout;

                  at76_dbg(DBG_DFU, "DFU: Waiting for manifest phase");
                  schedule_timeout_interruptible(dfu_timeout);
                  break;

            case STATE_DFU_MANIFEST:
                  at76_dbg(DBG_DFU, "STATE_DFU_MANIFEST");
                  is_done = 1;
                  break;

            case STATE_DFU_MANIFEST_WAIT_RESET:
                  at76_dbg(DBG_DFU, "STATE_DFU_MANIFEST_WAIT_RESET");
                  is_done = 1;
                  break;

            case STATE_DFU_UPLOAD_IDLE:
                  at76_dbg(DBG_DFU, "STATE_DFU_UPLOAD_IDLE");
                  break;

            case STATE_DFU_ERROR:
                  at76_dbg(DBG_DFU, "STATE_DFU_ERROR");
                  ret = -EPIPE;
                  break;

            default:
                  at76_dbg(DBG_DFU, "DFU UNKNOWN STATE (%d)", dfu_state);
                  ret = -EINVAL;
                  break;
            }
      } while (!is_done && (ret >= 0));

exit:
      kfree(block);
      if (ret >= 0)
            ret = 0;

      return ret;
}

#define HEX2STR_BUFFERS 4
#define HEX2STR_MAX_LEN 64
#define BIN2HEX(x) ((x) < 10 ? '0' + (x) : (x) + 'A' - 10)

/* Convert binary data into hex string */
static char *hex2str(void *buf, int len)
{
      static atomic_t a = ATOMIC_INIT(0);
      static char bufs[HEX2STR_BUFFERS][3 * HEX2STR_MAX_LEN + 1];
      char *ret = bufs[atomic_inc_return(&a) & (HEX2STR_BUFFERS - 1)];
      char *obuf = ret;
      u8 *ibuf = buf;

      if (len > HEX2STR_MAX_LEN)
            len = HEX2STR_MAX_LEN;

      if (len <= 0) {
            ret[0] = '\0';
            return ret;
      }

      while (len--) {
            *obuf++ = BIN2HEX(*ibuf >> 4);
            *obuf++ = BIN2HEX(*ibuf & 0xf);
            *obuf++ = '-';
            ibuf++;
      }
      *(--obuf) = '\0';

      return ret;
}

#define MAC2STR_BUFFERS 4

static inline char *mac2str(u8 *mac)
{
      static atomic_t a = ATOMIC_INIT(0);
      static char bufs[MAC2STR_BUFFERS][6 * 3];
      char *str;

      str = bufs[atomic_inc_return(&a) & (MAC2STR_BUFFERS - 1)];
      sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
            mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
      return str;
}

/* LED trigger */
static int tx_activity;
static void at76_ledtrig_tx_timerfunc(unsigned long data);
static DEFINE_TIMER(ledtrig_tx_timer, at76_ledtrig_tx_timerfunc, 0, 0);
DEFINE_LED_TRIGGER(ledtrig_tx);

static void at76_ledtrig_tx_timerfunc(unsigned long data)
{
      static int tx_lastactivity;

      if (tx_lastactivity != tx_activity) {
            tx_lastactivity = tx_activity;
            led_trigger_event(ledtrig_tx, LED_FULL);
            mod_timer(&ledtrig_tx_timer, jiffies + HZ / 4);
      } else
            led_trigger_event(ledtrig_tx, LED_OFF);
}

static void at76_ledtrig_tx_activity(void)
{
      tx_activity++;
      if (!timer_pending(&ledtrig_tx_timer))
            mod_timer(&ledtrig_tx_timer, jiffies + HZ / 4);
}

static int at76_remap(struct usb_device *udev)
{
      int ret;
      ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x0a,
                        USB_TYPE_VENDOR | USB_DIR_OUT |
                        USB_RECIP_INTERFACE, 0, 0, NULL, 0,
                        USB_CTRL_GET_TIMEOUT);
      if (ret < 0)
            return ret;
      return 0;
}

static int at76_get_op_mode(struct usb_device *udev)
{
      int ret;
      u8 saved;
      u8 *op_mode;

      op_mode = kmalloc(1, GFP_NOIO);
      if (!op_mode)
            return -ENOMEM;
      ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x33,
                        USB_TYPE_VENDOR | USB_DIR_IN |
                        USB_RECIP_INTERFACE, 0x01, 0, op_mode, 1,
                        USB_CTRL_GET_TIMEOUT);
      saved = *op_mode;
      kfree(op_mode);

      if (ret < 0)
            return ret;
      else if (ret < 1)
            return -EIO;
      else
            return saved;
}

/* Load a block of the second ("external") part of the firmware */
static inline int at76_load_ext_fw_block(struct usb_device *udev, int blockno,
                               void *block, int size)
{
      return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x0e,
                         USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
                         0x0802, blockno, block, size,
                         USB_CTRL_GET_TIMEOUT);
}

static inline int at76_get_hw_cfg(struct usb_device *udev,
                          union at76_hwcfg *buf, int buf_size)
{
      return usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x33,
                         USB_TYPE_VENDOR | USB_DIR_IN |
                         USB_RECIP_INTERFACE, 0x0a02, 0,
                         buf, buf_size, USB_CTRL_GET_TIMEOUT);
}

/* Intersil boards use a different "value" for GetHWConfig requests */
static inline int at76_get_hw_cfg_intersil(struct usb_device *udev,
                                 union at76_hwcfg *buf, int buf_size)
{
      return usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x33,
                         USB_TYPE_VENDOR | USB_DIR_IN |
                         USB_RECIP_INTERFACE, 0x0902, 0,
                         buf, buf_size, USB_CTRL_GET_TIMEOUT);
}

/* Get the hardware configuration for the adapter and put it to the appropriate
 * fields of 'priv' (the GetHWConfig request and interpretation of the result
 * depends on the board type) */
static int at76_get_hw_config(struct at76_priv *priv)
{
      int ret;
      union at76_hwcfg *hwcfg = kmalloc(sizeof(*hwcfg), GFP_KERNEL);

      if (!hwcfg)
            return -ENOMEM;

      if (at76_is_intersil(priv->board_type)) {
            ret = at76_get_hw_cfg_intersil(priv->udev, hwcfg,
                                     sizeof(hwcfg->i));
            if (ret < 0)
                  goto exit;
            memcpy(priv->mac_addr, hwcfg->i.mac_addr, ETH_ALEN);
            priv->regulatory_domain = hwcfg->i.regulatory_domain;
      } else if (at76_is_503rfmd(priv->board_type)) {
            ret = at76_get_hw_cfg(priv->udev, hwcfg, sizeof(hwcfg->r3));
            if (ret < 0)
                  goto exit;
            memcpy(priv->mac_addr, hwcfg->r3.mac_addr, ETH_ALEN);
            priv->regulatory_domain = hwcfg->r3.regulatory_domain;
      } else {
            ret = at76_get_hw_cfg(priv->udev, hwcfg, sizeof(hwcfg->r5));
            if (ret < 0)
                  goto exit;
            memcpy(priv->mac_addr, hwcfg->r5.mac_addr, ETH_ALEN);
            priv->regulatory_domain = hwcfg->r5.regulatory_domain;
      }

exit:
      kfree(hwcfg);
      if (ret < 0)
            printk(KERN_ERR "%s: cannot get HW Config (error %d)\n",
                   wiphy_name(priv->hw->wiphy), ret);

      return ret;
}

static struct reg_domain const *at76_get_reg_domain(u16 code)
{
      int i;
      static struct reg_domain const fd_tab[] = {
            { 0x10, "FCC (USA)", 0x7ff }, /* ch 1-11 */
            { 0x20, "IC (Canada)", 0x7ff },     /* ch 1-11 */
            { 0x30, "ETSI (most of Europe)", 0x1fff },      /* ch 1-13 */
            { 0x31, "Spain", 0x600 },     /* ch 10-11 */
            { 0x32, "France", 0x1e00 },   /* ch 10-13 */
            { 0x40, "MKK (Japan)", 0x2000 },    /* ch 14 */
            { 0x41, "MKK1 (Japan)", 0x3fff },   /* ch 1-14 */
            { 0x50, "Israel", 0x3fc },    /* ch 3-9 */
            { 0x00, "<unknown>", 0xffffffff }   /* ch 1-32 */
      };

      /* Last entry is fallback for unknown domain code */
      for (i = 0; i < ARRAY_SIZE(fd_tab) - 1; i++)
            if (code == fd_tab[i].code)
                  break;

      return &fd_tab[i];
}

static inline int at76_get_mib(struct usb_device *udev, u16 mib, void *buf,
                         int buf_size)
{
      int ret;

      ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x33,
                        USB_TYPE_VENDOR | USB_DIR_IN |
                        USB_RECIP_INTERFACE, mib << 8, 0, buf, buf_size,
                        USB_CTRL_GET_TIMEOUT);
      if (ret >= 0 && ret != buf_size)
            return -EIO;
      return ret;
}

/* Return positive number for status, negative for an error */
static inline int at76_get_cmd_status(struct usb_device *udev, u8 cmd)
{
      u8 *stat_buf;
      int ret;

      stat_buf = kmalloc(40, GFP_NOIO);
      if (!stat_buf)
            return -ENOMEM;

      ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x22,
                  USB_TYPE_VENDOR | USB_DIR_IN |
                  USB_RECIP_INTERFACE, cmd, 0, stat_buf,
                  40, USB_CTRL_GET_TIMEOUT);
      if (ret >= 0)
            ret = stat_buf[5];
      kfree(stat_buf);

      return ret;
}

#define MAKE_CMD_CASE(c) case (c): return #c
static const char *at76_get_cmd_string(u8 cmd_status)
{
      switch (cmd_status) {
            MAKE_CMD_CASE(CMD_SET_MIB);
            MAKE_CMD_CASE(CMD_GET_MIB);
            MAKE_CMD_CASE(CMD_SCAN);
            MAKE_CMD_CASE(CMD_JOIN);
            MAKE_CMD_CASE(CMD_START_IBSS);
            MAKE_CMD_CASE(CMD_RADIO_ON);
            MAKE_CMD_CASE(CMD_RADIO_OFF);
            MAKE_CMD_CASE(CMD_STARTUP);
      }

      return "UNKNOWN";
}

static int at76_set_card_command(struct usb_device *udev, u8 cmd, void *buf,
                         int buf_size)
{
      int ret;
      struct at76_command *cmd_buf = kmalloc(sizeof(struct at76_command) +
                                     buf_size, GFP_KERNEL);

      if (!cmd_buf)
            return -ENOMEM;

      cmd_buf->cmd = cmd;
      cmd_buf->reserved = 0;
      cmd_buf->size = cpu_to_le16(buf_size);
      memcpy(cmd_buf->data, buf, buf_size);

      at76_dbg_dump(DBG_CMD, cmd_buf, sizeof(struct at76_command) + buf_size,
                  "issuing command %s (0x%02x)",
                  at76_get_cmd_string(cmd), cmd);

      ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x0e,
                        USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
                        0, 0, cmd_buf,
                        sizeof(struct at76_command) + buf_size,
                        USB_CTRL_GET_TIMEOUT);
      kfree(cmd_buf);
      return ret;
}

#define MAKE_CMD_STATUS_CASE(c)     case (c): return #c
static const char *at76_get_cmd_status_string(u8 cmd_status)
{
      switch (cmd_status) {
            MAKE_CMD_STATUS_CASE(CMD_STATUS_IDLE);
            MAKE_CMD_STATUS_CASE(CMD_STATUS_COMPLETE);
            MAKE_CMD_STATUS_CASE(CMD_STATUS_UNKNOWN);
            MAKE_CMD_STATUS_CASE(CMD_STATUS_INVALID_PARAMETER);
            MAKE_CMD_STATUS_CASE(CMD_STATUS_FUNCTION_NOT_SUPPORTED);
            MAKE_CMD_STATUS_CASE(CMD_STATUS_TIME_OUT);
            MAKE_CMD_STATUS_CASE(CMD_STATUS_IN_PROGRESS);
            MAKE_CMD_STATUS_CASE(CMD_STATUS_HOST_FAILURE);
            MAKE_CMD_STATUS_CASE(CMD_STATUS_SCAN_FAILED);
      }

      return "UNKNOWN";
}

/* Wait until the command is completed */
static int at76_wait_completion(struct at76_priv *priv, int cmd)
{
      int status = 0;
      unsigned long timeout = jiffies + CMD_COMPLETION_TIMEOUT;

      do {
            status = at76_get_cmd_status(priv->udev, cmd);
            if (status < 0) {
                  printk(KERN_ERR "%s: at76_get_cmd_status failed: %d\n",
                         wiphy_name(priv->hw->wiphy), status);
                  break;
            }

            at76_dbg(DBG_WAIT_COMPLETE,
                   "%s: Waiting on cmd %d, status = %d (%s)",
                   wiphy_name(priv->hw->wiphy), cmd, status,
                   at76_get_cmd_status_string(status));

            if (status != CMD_STATUS_IN_PROGRESS
                && status != CMD_STATUS_IDLE)
                  break;

            schedule_timeout_interruptible(HZ / 10);  /* 100 ms */
            if (time_after(jiffies, timeout)) {
                  printk(KERN_ERR
                         "%s: completion timeout for command %d\n",
                         wiphy_name(priv->hw->wiphy), cmd);
                  status = -ETIMEDOUT;
                  break;
            }
      } while (1);

      return status;
}

static int at76_set_mib(struct at76_priv *priv, struct set_mib_buffer *buf)
{
      int ret;

      ret = at76_set_card_command(priv->udev, CMD_SET_MIB, buf,
                            offsetof(struct set_mib_buffer,
                                   data) + buf->size);
      if (ret < 0)
            return ret;

      ret = at76_wait_completion(priv, CMD_SET_MIB);
      if (ret != CMD_STATUS_COMPLETE) {
            printk(KERN_INFO
                   "%s: set_mib: at76_wait_completion failed "
                   "with %d\n", wiphy_name(priv->hw->wiphy), ret);
            ret = -EIO;
      }

      return ret;
}

/* Return < 0 on error, == 0 if no command sent, == 1 if cmd sent */
static int at76_set_radio(struct at76_priv *priv, int enable)
{
      int ret;
      int cmd;

      if (priv->radio_on == enable)
            return 0;

      cmd = enable ? CMD_RADIO_ON : CMD_RADIO_OFF;

      ret = at76_set_card_command(priv->udev, cmd, NULL, 0);
      if (ret < 0)
            printk(KERN_ERR "%s: at76_set_card_command(%d) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), cmd, ret);
      else
            ret = 1;

      priv->radio_on = enable;
      return ret;
}

/* Set current power save mode (AT76_PM_OFF/AT76_PM_ON/AT76_PM_SMART) */
static int at76_set_pm_mode(struct at76_priv *priv)
{
      int ret = 0;

      priv->mib_buf.type = MIB_MAC_MGMT;
      priv->mib_buf.size = 1;
      priv->mib_buf.index = offsetof(struct mib_mac_mgmt, power_mgmt_mode);
      priv->mib_buf.data.byte = priv->pm_mode;

      ret = at76_set_mib(priv, &priv->mib_buf);
      if (ret < 0)
            printk(KERN_ERR "%s: set_mib (pm_mode) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);

      return ret;
}

static int at76_set_preamble(struct at76_priv *priv, u8 type)
{
      int ret = 0;

      priv->mib_buf.type = MIB_LOCAL;
      priv->mib_buf.size = 1;
      priv->mib_buf.index = offsetof(struct mib_local, preamble_type);
      priv->mib_buf.data.byte = type;

      ret = at76_set_mib(priv, &priv->mib_buf);
      if (ret < 0)
            printk(KERN_ERR "%s: set_mib (preamble) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);

      return ret;
}

static int at76_set_frag(struct at76_priv *priv, u16 size)
{
      int ret = 0;

      priv->mib_buf.type = MIB_MAC;
      priv->mib_buf.size = 2;
      priv->mib_buf.index = offsetof(struct mib_mac, frag_threshold);
      priv->mib_buf.data.word = cpu_to_le16(size);

      ret = at76_set_mib(priv, &priv->mib_buf);
      if (ret < 0)
            printk(KERN_ERR "%s: set_mib (frag threshold) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);

      return ret;
}

static int at76_set_rts(struct at76_priv *priv, u16 size)
{
      int ret = 0;

      priv->mib_buf.type = MIB_MAC;
      priv->mib_buf.size = 2;
      priv->mib_buf.index = offsetof(struct mib_mac, rts_threshold);
      priv->mib_buf.data.word = cpu_to_le16(size);

      ret = at76_set_mib(priv, &priv->mib_buf);
      if (ret < 0)
            printk(KERN_ERR "%s: set_mib (rts) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);

      return ret;
}

static int at76_set_autorate_fallback(struct at76_priv *priv, int onoff)
{
      int ret = 0;

      priv->mib_buf.type = MIB_LOCAL;
      priv->mib_buf.size = 1;
      priv->mib_buf.index = offsetof(struct mib_local, txautorate_fallback);
      priv->mib_buf.data.byte = onoff;

      ret = at76_set_mib(priv, &priv->mib_buf);
      if (ret < 0)
            printk(KERN_ERR "%s: set_mib (autorate fallback) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);

      return ret;
}

static void at76_dump_mib_mac_addr(struct at76_priv *priv)
{
      int i;
      int ret;
      struct mib_mac_addr *m = kmalloc(sizeof(struct mib_mac_addr),
                               GFP_KERNEL);

      if (!m)
            return;

      ret = at76_get_mib(priv->udev, MIB_MAC_ADDR, m,
                     sizeof(struct mib_mac_addr));
      if (ret < 0) {
            printk(KERN_ERR "%s: at76_get_mib (MAC_ADDR) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            goto exit;
      }

      at76_dbg(DBG_MIB, "%s: MIB MAC_ADDR: mac_addr %s res 0x%x 0x%x",
             wiphy_name(priv->hw->wiphy),
             mac2str(m->mac_addr), m->res[0], m->res[1]);
      for (i = 0; i < ARRAY_SIZE(m->group_addr); i++)
            at76_dbg(DBG_MIB, "%s: MIB MAC_ADDR: group addr %d: %s, "
                   "status %d", wiphy_name(priv->hw->wiphy), i,
                   mac2str(m->group_addr[i]), m->group_addr_status[i]);
exit:
      kfree(m);
}

static void at76_dump_mib_mac_wep(struct at76_priv *priv)
{
      int i;
      int ret;
      int key_len;
      struct mib_mac_wep *m = kmalloc(sizeof(struct mib_mac_wep), GFP_KERNEL);

      if (!m)
            return;

      ret = at76_get_mib(priv->udev, MIB_MAC_WEP, m,
                     sizeof(struct mib_mac_wep));
      if (ret < 0) {
            printk(KERN_ERR "%s: at76_get_mib (MAC_WEP) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            goto exit;
      }

      at76_dbg(DBG_MIB, "%s: MIB MAC_WEP: priv_invoked %u def_key_id %u "
             "key_len %u excl_unencr %u wep_icv_err %u wep_excluded %u "
             "encr_level %u key %d", wiphy_name(priv->hw->wiphy),
             m->privacy_invoked, m->wep_default_key_id,
             m->wep_key_mapping_len, m->exclude_unencrypted,
             le32_to_cpu(m->wep_icv_error_count),
             le32_to_cpu(m->wep_excluded_count), m->encryption_level,
             m->wep_default_key_id);

      key_len = (m->encryption_level == 1) ?
          WEP_SMALL_KEY_LEN : WEP_LARGE_KEY_LEN;

      for (i = 0; i < WEP_KEYS; i++)
            at76_dbg(DBG_MIB, "%s: MIB MAC_WEP: key %d: %s",
                   wiphy_name(priv->hw->wiphy), i,
                   hex2str(m->wep_default_keyvalue[i], key_len));
exit:
      kfree(m);
}

static void at76_dump_mib_mac_mgmt(struct at76_priv *priv)
{
      int ret;
      struct mib_mac_mgmt *m = kmalloc(sizeof(struct mib_mac_mgmt),
                               GFP_KERNEL);

      if (!m)
            return;

      ret = at76_get_mib(priv->udev, MIB_MAC_MGMT, m,
                     sizeof(struct mib_mac_mgmt));
      if (ret < 0) {
            printk(KERN_ERR "%s: at76_get_mib (MAC_MGMT) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            goto exit;
      }

      at76_dbg(DBG_MIB, "%s: MIB MAC_MGMT: beacon_period %d CFP_max_duration "
             "%d medium_occupancy_limit %d station_id 0x%x ATIM_window %d "
             "CFP_mode %d privacy_opt_impl %d DTIM_period %d CFP_period %d "
             "current_bssid %s current_essid %s current_bss_type %d "
             "pm_mode %d ibss_change %d res %d "
             "multi_domain_capability_implemented %d "
             "international_roaming %d country_string %.3s",
             wiphy_name(priv->hw->wiphy), le16_to_cpu(m->beacon_period),
             le16_to_cpu(m->CFP_max_duration),
             le16_to_cpu(m->medium_occupancy_limit),
             le16_to_cpu(m->station_id), le16_to_cpu(m->ATIM_window),
             m->CFP_mode, m->privacy_option_implemented, m->DTIM_period,
             m->CFP_period, mac2str(m->current_bssid),
             hex2str(m->current_essid, IW_ESSID_MAX_SIZE),
             m->current_bss_type, m->power_mgmt_mode, m->ibss_change,
             m->res, m->multi_domain_capability_implemented,
             m->multi_domain_capability_enabled, m->country_string);
exit:
      kfree(m);
}

static void at76_dump_mib_mac(struct at76_priv *priv)
{
      int ret;
      struct mib_mac *m = kmalloc(sizeof(struct mib_mac), GFP_KERNEL);

      if (!m)
            return;

      ret = at76_get_mib(priv->udev, MIB_MAC, m, sizeof(struct mib_mac));
      if (ret < 0) {
            printk(KERN_ERR "%s: at76_get_mib (MAC) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            goto exit;
      }

      at76_dbg(DBG_MIB, "%s: MIB MAC: max_tx_msdu_lifetime %d "
             "max_rx_lifetime %d frag_threshold %d rts_threshold %d "
             "cwmin %d cwmax %d short_retry_time %d long_retry_time %d "
             "scan_type %d scan_channel %d probe_delay %u "
             "min_channel_time %d max_channel_time %d listen_int %d "
             "desired_ssid %s desired_bssid %s desired_bsstype %d",
             wiphy_name(priv->hw->wiphy),
             le32_to_cpu(m->max_tx_msdu_lifetime),
             le32_to_cpu(m->max_rx_lifetime),
             le16_to_cpu(m->frag_threshold), le16_to_cpu(m->rts_threshold),
             le16_to_cpu(m->cwmin), le16_to_cpu(m->cwmax),
             m->short_retry_time, m->long_retry_time, m->scan_type,
             m->scan_channel, le16_to_cpu(m->probe_delay),
             le16_to_cpu(m->min_channel_time),
             le16_to_cpu(m->max_channel_time),
             le16_to_cpu(m->listen_interval),
             hex2str(m->desired_ssid, IW_ESSID_MAX_SIZE),
             mac2str(m->desired_bssid), m->desired_bsstype);
exit:
      kfree(m);
}

static void at76_dump_mib_phy(struct at76_priv *priv)
{
      int ret;
      struct mib_phy *m = kmalloc(sizeof(struct mib_phy), GFP_KERNEL);

      if (!m)
            return;

      ret = at76_get_mib(priv->udev, MIB_PHY, m, sizeof(struct mib_phy));
      if (ret < 0) {
            printk(KERN_ERR "%s: at76_get_mib (PHY) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            goto exit;
      }

      at76_dbg(DBG_MIB, "%s: MIB PHY: ed_threshold %d slot_time %d "
             "sifs_time %d preamble_length %d plcp_header_length %d "
             "mpdu_max_length %d cca_mode_supported %d operation_rate_set "
             "0x%x 0x%x 0x%x 0x%x channel_id %d current_cca_mode %d "
             "phy_type %d current_reg_domain %d",
             wiphy_name(priv->hw->wiphy), le32_to_cpu(m->ed_threshold),
             le16_to_cpu(m->slot_time), le16_to_cpu(m->sifs_time),
             le16_to_cpu(m->preamble_length),
             le16_to_cpu(m->plcp_header_length),
             le16_to_cpu(m->mpdu_max_length),
             le16_to_cpu(m->cca_mode_supported), m->operation_rate_set[0],
             m->operation_rate_set[1], m->operation_rate_set[2],
             m->operation_rate_set[3], m->channel_id, m->current_cca_mode,
             m->phy_type, m->current_reg_domain);
exit:
      kfree(m);
}

static void at76_dump_mib_local(struct at76_priv *priv)
{
      int ret;
      struct mib_local *m = kmalloc(sizeof(struct mib_phy), GFP_KERNEL);

      if (!m)
            return;

      ret = at76_get_mib(priv->udev, MIB_LOCAL, m, sizeof(struct mib_local));
      if (ret < 0) {
            printk(KERN_ERR "%s: at76_get_mib (LOCAL) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            goto exit;
      }

      at76_dbg(DBG_MIB, "%s: MIB LOCAL: beacon_enable %d "
             "txautorate_fallback %d ssid_size %d promiscuous_mode %d "
             "preamble_type %d", wiphy_name(priv->hw->wiphy),
             m->beacon_enable,
             m->txautorate_fallback, m->ssid_size, m->promiscuous_mode,
             m->preamble_type);
exit:
      kfree(m);
}

static void at76_dump_mib_mdomain(struct at76_priv *priv)
{
      int ret;
      struct mib_mdomain *m = kmalloc(sizeof(struct mib_mdomain), GFP_KERNEL);

      if (!m)
            return;

      ret = at76_get_mib(priv->udev, MIB_MDOMAIN, m,
                     sizeof(struct mib_mdomain));
      if (ret < 0) {
            printk(KERN_ERR "%s: at76_get_mib (MDOMAIN) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            goto exit;
      }

      at76_dbg(DBG_MIB, "%s: MIB MDOMAIN: channel_list %s",
             wiphy_name(priv->hw->wiphy),
             hex2str(m->channel_list, sizeof(m->channel_list)));

      at76_dbg(DBG_MIB, "%s: MIB MDOMAIN: tx_powerlevel %s",
             wiphy_name(priv->hw->wiphy),
             hex2str(m->tx_powerlevel, sizeof(m->tx_powerlevel)));
exit:
      kfree(m);
}

/* Enable monitor mode */
static int at76_start_monitor(struct at76_priv *priv)
{
      struct at76_req_scan scan;
      int ret;

      memset(&scan, 0, sizeof(struct at76_req_scan));
      memset(scan.bssid, 0xff, ETH_ALEN);

      scan.channel = priv->channel;
      scan.scan_type = SCAN_TYPE_PASSIVE;
      scan.international_scan = 0;

      ret = at76_set_card_command(priv->udev, CMD_SCAN, &scan, sizeof(scan));
      if (ret >= 0)
            ret = at76_get_cmd_status(priv->udev, CMD_SCAN);

      return ret;
}

/* Calculate padding from txbuf->wlength (which excludes the USB TX header),
   likely to compensate a flaw in the AT76C503A USB part ... */
static inline int at76_calc_padding(int wlen)
{
      /* add the USB TX header */
      wlen += AT76_TX_HDRLEN;

      wlen = wlen % 64;

      if (wlen < 50)
            return 50 - wlen;

      if (wlen >= 61)
            return 64 + 50 - wlen;

      return 0;
}

static void at76_rx_callback(struct urb *urb)
{
      struct at76_priv *priv = urb->context;

      priv->rx_tasklet.data = (unsigned long)urb;
      tasklet_schedule(&priv->rx_tasklet);
      return;
}

static int at76_submit_rx_urb(struct at76_priv *priv)
{
      int ret;
      int size;
      struct sk_buff *skb = priv->rx_skb;

      if (!priv->rx_urb) {
            printk(KERN_ERR "%s: %s: priv->rx_urb is NULL\n",
                   wiphy_name(priv->hw->wiphy), __func__);
            return -EFAULT;
      }

      if (!skb) {
            skb = dev_alloc_skb(sizeof(struct at76_rx_buffer));
            if (!skb) {
                  printk(KERN_ERR "%s: cannot allocate rx skbuff\n",
                         wiphy_name(priv->hw->wiphy));
                  ret = -ENOMEM;
                  goto exit;
            }
            priv->rx_skb = skb;
      } else {
            skb_push(skb, skb_headroom(skb));
            skb_trim(skb, 0);
      }

      size = skb_tailroom(skb);
      usb_fill_bulk_urb(priv->rx_urb, priv->udev, priv->rx_pipe,
                    skb_put(skb, size), size, at76_rx_callback, priv);
      ret = usb_submit_urb(priv->rx_urb, GFP_ATOMIC);
      if (ret < 0) {
            if (ret == -ENODEV)
                  at76_dbg(DBG_DEVSTART,
                         "usb_submit_urb returned -ENODEV");
            else
                  printk(KERN_ERR "%s: rx, usb_submit_urb failed: %d\n",
                         wiphy_name(priv->hw->wiphy), ret);
      }

exit:
      if (ret < 0 && ret != -ENODEV)
            printk(KERN_ERR "%s: cannot submit rx urb - please unload the "
                   "driver and/or power cycle the device\n",
                   wiphy_name(priv->hw->wiphy));

      return ret;
}

/* Download external firmware */
static int at76_load_external_fw(struct usb_device *udev, struct fwentry *fwe)
{
      int ret;
      int op_mode;
      int blockno = 0;
      int bsize;
      u8 *block;
      u8 *buf = fwe->extfw;
      int size = fwe->extfw_size;

      if (!buf || !size)
            return -ENOENT;

      op_mode = at76_get_op_mode(udev);
      at76_dbg(DBG_DEVSTART, "opmode %d", op_mode);

      if (op_mode != OPMODE_NORMAL_NIC_WITHOUT_FLASH) {
            dev_printk(KERN_ERR, &udev->dev, "unexpected opmode %d\n",
                     op_mode);
            return -EINVAL;
      }

      block = kmalloc(FW_BLOCK_SIZE, GFP_KERNEL);
      if (!block)
            return -ENOMEM;

      at76_dbg(DBG_DEVSTART, "downloading external firmware");

      /* for fw >= 0.100, the device needs an extra empty block */
      do {
            bsize = min_t(int, size, FW_BLOCK_SIZE);
            memcpy(block, buf, bsize);
            at76_dbg(DBG_DEVSTART,
                   "ext fw, size left = %5d, bsize = %4d, blockno = %2d",
                   size, bsize, blockno);
            ret = at76_load_ext_fw_block(udev, blockno, block, bsize);
            if (ret != bsize) {
                  dev_printk(KERN_ERR, &udev->dev,
                           "loading %dth firmware block failed: %d\n",
                           blockno, ret);
                  goto exit;
            }
            buf += bsize;
            size -= bsize;
            blockno++;
      } while (bsize > 0);

      if (at76_is_505a(fwe->board_type)) {
            at76_dbg(DBG_DEVSTART, "200 ms delay for 505a");
            schedule_timeout_interruptible(HZ / 5 + 1);
      }

exit:
      kfree(block);
      if (ret < 0)
            dev_printk(KERN_ERR, &udev->dev,
                     "downloading external firmware failed: %d\n", ret);
      return ret;
}

/* Download internal firmware */
static int at76_load_internal_fw(struct usb_device *udev, struct fwentry *fwe)
{
      int ret;
      int need_remap = !at76_is_505a(fwe->board_type);

      ret = at76_usbdfu_download(udev, fwe->intfw, fwe->intfw_size,
                           need_remap ? 0 : 2 * HZ);

      if (ret < 0) {
            dev_printk(KERN_ERR, &udev->dev,
                     "downloading internal fw failed with %d\n", ret);
            goto exit;
      }

      at76_dbg(DBG_DEVSTART, "sending REMAP");

      /* no REMAP for 505A (see SF driver) */
      if (need_remap) {
            ret = at76_remap(udev);
            if (ret < 0) {
                  dev_printk(KERN_ERR, &udev->dev,
                           "sending REMAP failed with %d\n", ret);
                  goto exit;
            }
      }

      at76_dbg(DBG_DEVSTART, "sleeping for 2 seconds");
      schedule_timeout_interruptible(2 * HZ + 1);
      usb_reset_device(udev);

exit:
      return ret;
}

static int at76_startup_device(struct at76_priv *priv)
{
      struct at76_card_config *ccfg = &priv->card_config;
      int ret;

      at76_dbg(DBG_PARAMS,
             "%s param: ssid %.*s (%s) mode %s ch %d wep %s key %d "
             "keylen %d", wiphy_name(priv->hw->wiphy), priv->essid_size,
             priv->essid, hex2str(priv->essid, IW_ESSID_MAX_SIZE),
             priv->iw_mode == IW_MODE_ADHOC ? "adhoc" : "infra",
             priv->channel, priv->wep_enabled ? "enabled" : "disabled",
             priv->wep_key_id, priv->wep_keys_len[priv->wep_key_id]);
      at76_dbg(DBG_PARAMS,
             "%s param: preamble %s rts %d retry %d frag %d "
             "txrate %s auth_mode %d", wiphy_name(priv->hw->wiphy),
             preambles[priv->preamble_type], priv->rts_threshold,
             priv->short_retry_limit, priv->frag_threshold,
             priv->txrate == TX_RATE_1MBIT ? "1MBit" : priv->txrate ==
             TX_RATE_2MBIT ? "2MBit" : priv->txrate ==
             TX_RATE_5_5MBIT ? "5.5MBit" : priv->txrate ==
             TX_RATE_11MBIT ? "11MBit" : priv->txrate ==
             TX_RATE_AUTO ? "auto" : "<invalid>", priv->auth_mode);
      at76_dbg(DBG_PARAMS,
             "%s param: pm_mode %d pm_period %d auth_mode %s "
             "scan_times %d %d scan_mode %s",
             wiphy_name(priv->hw->wiphy), priv->pm_mode, priv->pm_period,
             priv->auth_mode == WLAN_AUTH_OPEN ? "open" : "shared_secret",
             priv->scan_min_time, priv->scan_max_time,
             priv->scan_mode == SCAN_TYPE_ACTIVE ? "active" : "passive");

      memset(ccfg, 0, sizeof(struct at76_card_config));
      ccfg->promiscuous_mode = 0;
      ccfg->short_retry_limit = priv->short_retry_limit;

      if (priv->wep_enabled) {
            if (priv->wep_keys_len[priv->wep_key_id] > WEP_SMALL_KEY_LEN)
                  ccfg->encryption_type = 2;
            else
                  ccfg->encryption_type = 1;

            /* jal: always exclude unencrypted if WEP is active */
            ccfg->exclude_unencrypted = 1;
      } else {
            ccfg->exclude_unencrypted = 0;
            ccfg->encryption_type = 0;
      }

      ccfg->rts_threshold = cpu_to_le16(priv->rts_threshold);
      ccfg->fragmentation_threshold = cpu_to_le16(priv->frag_threshold);

      memcpy(ccfg->basic_rate_set, hw_rates, 4);
      /* jal: really needed, we do a set_mib for autorate later ??? */
      ccfg->auto_rate_fallback = (priv->txrate == TX_RATE_AUTO ? 1 : 0);
      ccfg->channel = priv->channel;
      ccfg->privacy_invoked = priv->wep_enabled;
      memcpy(ccfg->current_ssid, priv->essid, IW_ESSID_MAX_SIZE);
      ccfg->ssid_len = priv->essid_size;

      ccfg->wep_default_key_id = priv->wep_key_id;
      memcpy(ccfg->wep_default_key_value, priv->wep_keys,
             sizeof(priv->wep_keys));

      ccfg->short_preamble = priv->preamble_type;
      ccfg->beacon_period = cpu_to_le16(priv->beacon_period);

      ret = at76_set_card_command(priv->udev, CMD_STARTUP, &priv->card_config,
                            sizeof(struct at76_card_config));
      if (ret < 0) {
            printk(KERN_ERR "%s: at76_set_card_command failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            return ret;
      }

      at76_wait_completion(priv, CMD_STARTUP);

      /* remove BSSID from previous run */
      memset(priv->bssid, 0, ETH_ALEN);

      if (at76_set_radio(priv, 1) == 1)
            at76_wait_completion(priv, CMD_RADIO_ON);

      ret = at76_set_preamble(priv, priv->preamble_type);
      if (ret < 0)
            return ret;

      ret = at76_set_frag(priv, priv->frag_threshold);
      if (ret < 0)
            return ret;

      ret = at76_set_rts(priv, priv->rts_threshold);
      if (ret < 0)
            return ret;

      ret = at76_set_autorate_fallback(priv,
                               priv->txrate == TX_RATE_AUTO ? 1 : 0);
      if (ret < 0)
            return ret;

      ret = at76_set_pm_mode(priv);
      if (ret < 0)
            return ret;

      if (at76_debug & DBG_MIB) {
            at76_dump_mib_mac(priv);
            at76_dump_mib_mac_addr(priv);
            at76_dump_mib_mac_mgmt(priv);
            at76_dump_mib_mac_wep(priv);
            at76_dump_mib_mdomain(priv);
            at76_dump_mib_phy(priv);
            at76_dump_mib_local(priv);
      }

      return 0;
}

/* Enable or disable promiscuous mode */
static void at76_work_set_promisc(struct work_struct *work)
{
      struct at76_priv *priv = container_of(work, struct at76_priv,
                                    work_set_promisc);
      int ret = 0;

      if (priv->device_unplugged)
            return;

      mutex_lock(&priv->mtx);

      priv->mib_buf.type = MIB_LOCAL;
      priv->mib_buf.size = 1;
      priv->mib_buf.index = offsetof(struct mib_local, promiscuous_mode);
      priv->mib_buf.data.byte = priv->promisc ? 1 : 0;

      ret = at76_set_mib(priv, &priv->mib_buf);
      if (ret < 0)
            printk(KERN_ERR "%s: set_mib (promiscuous_mode) failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);

      mutex_unlock(&priv->mtx);
}

/* Submit Rx urb back to the device */
static void at76_work_submit_rx(struct work_struct *work)
{
      struct at76_priv *priv = container_of(work, struct at76_priv,
                                    work_submit_rx);

      mutex_lock(&priv->mtx);
      at76_submit_rx_urb(priv);
      mutex_unlock(&priv->mtx);
}

static void at76_rx_tasklet(unsigned long param)
{
      struct urb *urb = (struct urb *)param;
      struct at76_priv *priv = urb->context;
      struct at76_rx_buffer *buf;
      struct ieee80211_rx_status rx_status = { 0 };

      if (priv->device_unplugged) {
            at76_dbg(DBG_DEVSTART, "device unplugged");
            if (urb)
                  at76_dbg(DBG_DEVSTART, "urb status %d", urb->status);
            return;
      }

      if (!priv->rx_skb || !priv->rx_skb->data)
            return;

      buf = (struct at76_rx_buffer *)priv->rx_skb->data;

      if (urb->status != 0) {
            if (urb->status != -ENOENT && urb->status != -ECONNRESET)
                  at76_dbg(DBG_URB,
                         "%s %s: - nonzero Rx bulk status received: %d",
                         __func__, wiphy_name(priv->hw->wiphy),
                         urb->status);
            return;
      }

      at76_dbg(DBG_RX_ATMEL_HDR,
             "%s: rx frame: rate %d rssi %d noise %d link %d",
             wiphy_name(priv->hw->wiphy), buf->rx_rate, buf->rssi,
             buf->noise_level, buf->link_quality);

      skb_pull(priv->rx_skb, AT76_RX_HDRLEN);
      skb_trim(priv->rx_skb, le16_to_cpu(buf->wlength));
      at76_dbg_dump(DBG_RX_DATA, priv->rx_skb->data,
                  priv->rx_skb->len, "RX: len=%d", priv->rx_skb->len);

      rx_status.signal = buf->rssi;
      rx_status.flag |= RX_FLAG_DECRYPTED;
      rx_status.flag |= RX_FLAG_IV_STRIPPED;

      at76_dbg(DBG_MAC80211, "calling ieee80211_rx_irqsafe(): %d/%d",
             priv->rx_skb->len, priv->rx_skb->data_len);
      ieee80211_rx_irqsafe(priv->hw, priv->rx_skb, &rx_status);

      /* Use a new skb for the next receive */
      priv->rx_skb = NULL;

      at76_submit_rx_urb(priv);
}

/* Load firmware into kernel memory and parse it */
static struct fwentry *at76_load_firmware(struct usb_device *udev,
                                enum board_type board_type)
{
      int ret;
      char *str;
      struct at76_fw_header *fwh;
      struct fwentry *fwe = &firmwares[board_type];

      mutex_lock(&fw_mutex);

      if (fwe->loaded) {
            at76_dbg(DBG_FW, "re-using previously loaded fw");
            goto exit;
      }

      at76_dbg(DBG_FW, "downloading firmware %s", fwe->fwname);
      ret = request_firmware(&fwe->fw, fwe->fwname, &udev->dev);
      if (ret < 0) {
            dev_printk(KERN_ERR, &udev->dev, "firmware %s not found!\n",
                     fwe->fwname);
            dev_printk(KERN_ERR, &udev->dev,
                     "you may need to download the firmware from "
                     "http://developer.berlios.de/projects/at76c503a/\n");
            goto exit;
      }

      at76_dbg(DBG_FW, "got it.");
      fwh = (struct at76_fw_header *)(fwe->fw->data);

      if (fwe->fw->size <= sizeof(*fwh)) {
            dev_printk(KERN_ERR, &udev->dev,
                     "firmware is too short (0x%zx)\n", fwe->fw->size);
            goto exit;
      }

      /* CRC currently not checked */
      fwe->board_type = le32_to_cpu(fwh->board_type);
      if (fwe->board_type != board_type) {
            dev_printk(KERN_ERR, &udev->dev,
                     "board type mismatch, requested %u, got %u\n",
                     board_type, fwe->board_type);
            goto exit;
      }

      fwe->fw_version.major = fwh->major;
      fwe->fw_version.minor = fwh->minor;
      fwe->fw_version.patch = fwh->patch;
      fwe->fw_version.build = fwh->build;

      str = (char *)fwh + le32_to_cpu(fwh->str_offset);
      fwe->intfw = (u8 *)fwh + le32_to_cpu(fwh->int_fw_offset);
      fwe->intfw_size = le32_to_cpu(fwh->int_fw_len);
      fwe->extfw = (u8 *)fwh + le32_to_cpu(fwh->ext_fw_offset);
      fwe->extfw_size = le32_to_cpu(fwh->ext_fw_len);

      fwe->loaded = 1;

      dev_printk(KERN_DEBUG, &udev->dev,
               "using firmware %s (version %d.%d.%d-%d)\n",
               fwe->fwname, fwh->major, fwh->minor, fwh->patch, fwh->build);

      at76_dbg(DBG_DEVSTART, "board %u, int %d:%d, ext %d:%d", board_type,
             le32_to_cpu(fwh->int_fw_offset), le32_to_cpu(fwh->int_fw_len),
             le32_to_cpu(fwh->ext_fw_offset), le32_to_cpu(fwh->ext_fw_len));
      at76_dbg(DBG_DEVSTART, "firmware id %s", str);

exit:
      mutex_unlock(&fw_mutex);

      if (fwe->loaded)
            return fwe;
      else
            return NULL;
}

static void at76_mac80211_tx_callback(struct urb *urb)
{
      struct at76_priv *priv = urb->context;
      struct ieee80211_tx_info *info = IEEE80211_SKB_CB(priv->tx_skb);

      at76_dbg(DBG_MAC80211, "%s()", __func__);

      switch (urb->status) {
      case 0:
            /* success */
            info->flags |= IEEE80211_TX_STAT_ACK;
            break;
      case -ENOENT:
      case -ECONNRESET:
            /* fail, urb has been unlinked */
            /* FIXME: add error message */
            break;
      default:
            at76_dbg(DBG_URB, "%s - nonzero tx status received: %d",
                   __func__, urb->status);
            break;
      }

      memset(&info->status, 0, sizeof(info->status));

      ieee80211_tx_status_irqsafe(priv->hw, priv->tx_skb);

      priv->tx_skb = NULL;

      ieee80211_wake_queues(priv->hw);
}

static int at76_mac80211_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
      struct at76_priv *priv = hw->priv;
      struct at76_tx_buffer *tx_buffer = priv->bulk_out_buffer;
      struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
      int padding, submit_len, ret;

      at76_dbg(DBG_MAC80211, "%s()", __func__);

      if (priv->tx_urb->status == -EINPROGRESS) {
            printk(KERN_ERR "%s: %s called while tx urb is pending\n",
                   wiphy_name(priv->hw->wiphy), __func__);
            return NETDEV_TX_BUSY;
      }

      ieee80211_stop_queues(hw);

      at76_ledtrig_tx_activity();   /* tell ledtrigger we send a packet */

      WARN_ON(priv->tx_skb != NULL);

      priv->tx_skb = skb;
      padding = at76_calc_padding(skb->len);
      submit_len = AT76_TX_HDRLEN + skb->len + padding;

      /* setup 'Atmel' header */
      memset(tx_buffer, 0, sizeof(*tx_buffer));
      tx_buffer->padding = padding;
      tx_buffer->wlength = cpu_to_le16(skb->len);
      tx_buffer->tx_rate = ieee80211_get_tx_rate(hw, info)->hw_value;
      memset(tx_buffer->reserved, 0, sizeof(tx_buffer->reserved));
      memcpy(tx_buffer->packet, skb->data, skb->len);

      at76_dbg(DBG_TX_DATA, "%s tx: wlen 0x%x pad 0x%x rate %d hdr",
             wiphy_name(priv->hw->wiphy), le16_to_cpu(tx_buffer->wlength),
             tx_buffer->padding, tx_buffer->tx_rate);

      /* send stuff */
      at76_dbg_dump(DBG_TX_DATA_CONTENT, tx_buffer, submit_len,
                  "%s(): tx_buffer %d bytes:", __func__, submit_len);
      usb_fill_bulk_urb(priv->tx_urb, priv->udev, priv->tx_pipe, tx_buffer,
                    submit_len, at76_mac80211_tx_callback, priv);
      ret = usb_submit_urb(priv->tx_urb, GFP_ATOMIC);
      if (ret) {
            printk(KERN_ERR "%s: error in tx submit urb: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            if (ret == -EINVAL)
                  printk(KERN_ERR
                         "%s: -EINVAL: tx urb %p hcpriv %p complete %p\n",
                         wiphy_name(priv->hw->wiphy), priv->tx_urb,
                         priv->tx_urb->hcpriv, priv->tx_urb->complete);
      }

      return 0;
}

static int at76_mac80211_start(struct ieee80211_hw *hw)
{
      struct at76_priv *priv = hw->priv;
      int ret;

      at76_dbg(DBG_MAC80211, "%s()", __func__);

      mutex_lock(&priv->mtx);

      ret = at76_submit_rx_urb(priv);
      if (ret < 0) {
            printk(KERN_ERR "%s: open: submit_rx_urb failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            goto error;
      }

      at76_startup_device(priv);

      at76_start_monitor(priv);

error:
      mutex_unlock(&priv->mtx);

      return 0;
}

static void at76_mac80211_stop(struct ieee80211_hw *hw)
{
      struct at76_priv *priv = hw->priv;

      at76_dbg(DBG_MAC80211, "%s()", __func__);

      mutex_lock(&priv->mtx);

      if (!priv->device_unplugged) {
            /* We are called by "ifconfig ethX down", not because the
             * device is not available anymore. */
            at76_set_radio(priv, 0);

            /* We unlink rx_urb because at76_open() re-submits it.
             * If unplugged, at76_delete_device() takes care of it. */
            usb_kill_urb(priv->rx_urb);
      }

      mutex_unlock(&priv->mtx);
}

static int at76_add_interface(struct ieee80211_hw *hw,
                        struct ieee80211_if_init_conf *conf)
{
      struct at76_priv *priv = hw->priv;
      int ret = 0;

      at76_dbg(DBG_MAC80211, "%s()", __func__);

      mutex_lock(&priv->mtx);

      switch (conf->type) {
      case NL80211_IFTYPE_STATION:
            priv->iw_mode = IW_MODE_INFRA;
            break;
      default:
            ret = -EOPNOTSUPP;
            goto exit;
      }

exit:
      mutex_unlock(&priv->mtx);

      return ret;
}

static void at76_remove_interface(struct ieee80211_hw *hw,
                          struct ieee80211_if_init_conf *conf)
{
      at76_dbg(DBG_MAC80211, "%s()", __func__);
}

static int at76_join(struct at76_priv *priv)
{
      struct at76_req_join join;
      int ret;

      memset(&join, 0, sizeof(struct at76_req_join));
      memcpy(join.essid, priv->essid, priv->essid_size);
      join.essid_size = priv->essid_size;
      memcpy(join.bssid, priv->bssid, ETH_ALEN);
      join.bss_type = INFRASTRUCTURE_MODE;
      join.channel = priv->channel;
      join.timeout = cpu_to_le16(2000);

      at76_dbg(DBG_MAC80211, "%s: sending CMD_JOIN", __func__);
      ret = at76_set_card_command(priv->udev, CMD_JOIN, &join,
                            sizeof(struct at76_req_join));

      if (ret < 0) {
            printk(KERN_ERR "%s: at76_set_card_command failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            return 0;
      }

      ret = at76_wait_completion(priv, CMD_JOIN);
      at76_dbg(DBG_MAC80211, "%s: CMD_JOIN returned: 0x%02x", __func__, ret);
      if (ret != CMD_STATUS_COMPLETE) {
            printk(KERN_ERR "%s: at76_wait_completion failed: %d\n",
                   wiphy_name(priv->hw->wiphy), ret);
            return 0;
      }

      at76_set_pm_mode(priv);

      return 0;
}

static void at76_dwork_hw_scan(struct work_struct *work)
{
      struct at76_priv *priv = container_of(work, struct at76_priv,
                                    dwork_hw_scan.work);
      int ret;

      if (priv->device_unplugged)
            return;

      mutex_lock(&priv->mtx);

      ret = at76_get_cmd_status(priv->udev, CMD_SCAN);
      at76_dbg(DBG_MAC80211, "%s: CMD_SCAN status 0x%02x", __func__, ret);

      /* FIXME: add maximum time for scan to complete */

      if (ret != CMD_STATUS_COMPLETE) {
            queue_delayed_work(priv->hw->workqueue, &priv->dwork_hw_scan,
                           SCAN_POLL_INTERVAL);
            mutex_unlock(&priv->mtx);
            return;
      }

      if (is_valid_ether_addr(priv->bssid))
            at76_join(priv);

      mutex_unlock(&priv->mtx);

      ieee80211_scan_completed(priv->hw, false);

      ieee80211_wake_queues(priv->hw);
}

static int at76_hw_scan(struct ieee80211_hw *hw,
                  struct cfg80211_scan_request *req)
{
      struct at76_priv *priv = hw->priv;
      struct at76_req_scan scan;
      u8 *ssid = NULL;
      int ret, len = 0;

      at76_dbg(DBG_MAC80211, "%s():", __func__);

      if (priv->device_unplugged)
            return 0;

      mutex_lock(&priv->mtx);

      ieee80211_stop_queues(hw);

      memset(&scan, 0, sizeof(struct at76_req_scan));
      memset(scan.bssid, 0xFF, ETH_ALEN);

      if (req->n_ssids) {
            scan.scan_type = SCAN_TYPE_ACTIVE;
            ssid = req->ssids[0].ssid;
            len = req->ssids[0].ssid_len;
      } else {
            scan.scan_type = SCAN_TYPE_PASSIVE;
      }

      if (len) {
            memcpy(scan.essid, ssid, len);
            scan.essid_size = len;
      }

      scan.min_channel_time = cpu_to_le16(priv->scan_min_time);
      scan.max_channel_time = cpu_to_le16(priv->scan_max_time);
      scan.probe_delay = cpu_to_le16(priv->scan_min_time * 1000);
      scan.international_scan = 0;

      at76_dbg(DBG_MAC80211, "%s: sending CMD_SCAN", __func__);
      ret = at76_set_card_command(priv->udev, CMD_SCAN, &scan, sizeof(scan));

      if (ret < 0) {
            err("CMD_SCAN failed: %d", ret);
            goto exit;
      }

      queue_delayed_work(priv->hw->workqueue, &priv->dwork_hw_scan,
                     SCAN_POLL_INTERVAL);

exit:
      mutex_unlock(&priv->mtx);

      return 0;
}

static int at76_config(struct ieee80211_hw *hw, u32 changed)
{
      struct at76_priv *priv = hw->priv;

      at76_dbg(DBG_MAC80211, "%s(): channel %d radio %d",
             __func__, hw->conf.channel->hw_value,
             hw->conf.radio_enabled);
      at76_dbg_dump(DBG_MAC80211, priv->bssid, ETH_ALEN, "bssid:");

      mutex_lock(&priv->mtx);

      priv->channel = hw->conf.channel->hw_value;

      if (is_valid_ether_addr(priv->bssid))
            at76_join(priv);
      else
            at76_start_monitor(priv);

      mutex_unlock(&priv->mtx);

      return 0;
}

static void at76_bss_info_changed(struct ieee80211_hw *hw,
                          struct ieee80211_vif *vif,
                          struct ieee80211_bss_conf *conf,
                          u32 changed)
{
      struct at76_priv *priv = hw->priv;

      at76_dbg(DBG_MAC80211, "%s():", __func__);

      if (!(changed & BSS_CHANGED_BSSID))
            return;

      at76_dbg_dump(DBG_MAC80211, conf->bssid, ETH_ALEN, "bssid:");

      mutex_lock(&priv->mtx);

      memcpy(priv->bssid, conf->bssid, ETH_ALEN);

      if (is_valid_ether_addr(priv->bssid))
            /* mac80211 is joining a bss */
            at76_join(priv);

      mutex_unlock(&priv->mtx);
}

/* must be atomic */
static void at76_configure_filter(struct ieee80211_hw *hw,
                          unsigned int changed_flags,
                          unsigned int *total_flags, int mc_count,
                          struct dev_addr_list *mc_list)
{
      struct at76_priv *priv = hw->priv;
      int flags;

      at76_dbg(DBG_MAC80211, "%s(): changed_flags=0x%08x "
             "total_flags=0x%08x mc_count=%d",
             __func__, changed_flags, *total_flags, mc_count);

      flags = changed_flags & AT76_SUPPORTED_FILTERS;
      *total_flags = AT76_SUPPORTED_FILTERS;

      /* Bail out after updating flags to prevent a WARN_ON in mac80211. */
      if (priv->device_unplugged)
            return;

      /* FIXME: access to priv->promisc should be protected with
       * priv->mtx, but it's impossible because this function needs to be
       * atomic */

      if (flags && !priv->promisc) {
            /* mac80211 wants us to enable promiscuous mode */
            priv->promisc = 1;
      } else if (!flags && priv->promisc) {
            /* we need to disable promiscuous mode */
            priv->promisc = 0;
      } else
            return;

      queue_work(hw->workqueue, &priv->work_set_promisc);
}

static int at76_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                  struct ieee80211_vif *vif, struct ieee80211_sta *sta,
                  struct ieee80211_key_conf *key)
{
      struct at76_priv *priv = hw->priv;

      int i;

      at76_dbg(DBG_MAC80211, "%s(): cmd %d key->alg %d key->keyidx %d "
             "key->keylen %d",
             __func__, cmd, key->alg, key->keyidx, key->keylen);

      if (key->alg != ALG_WEP)
            return -EOPNOTSUPP;

      key->hw_key_idx = key->keyidx;

      mutex_lock(&priv->mtx);

      switch (cmd) {
      case SET_KEY:
            memcpy(priv->wep_keys[key->keyidx], key->key, key->keylen);
            priv->wep_keys_len[key->keyidx] = key->keylen;

            /* FIXME: find out how to do this properly */
            priv->wep_key_id = key->keyidx;

            break;
      case DISABLE_KEY:
      default:
            priv->wep_keys_len[key->keyidx] = 0;
            break;
      }

      priv->wep_enabled = 0;

      for (i = 0; i < WEP_KEYS; i++) {
            if (priv->wep_keys_len[i] != 0)
                  priv->wep_enabled = 1;
      }

      at76_startup_device(priv);

      mutex_unlock(&priv->mtx);

      return 0;
}

static const struct ieee80211_ops at76_ops = {
      .tx = at76_mac80211_tx,
      .add_interface = at76_add_interface,
      .remove_interface = at76_remove_interface,
      .config = at76_config,
      .bss_info_changed = at76_bss_info_changed,
      .configure_filter = at76_configure_filter,
      .start = at76_mac80211_start,
      .stop = at76_mac80211_stop,
      .hw_scan = at76_hw_scan,
      .set_key = at76_set_key,
};

/* Allocate network device and initialize private data */
static struct at76_priv *at76_alloc_new_device(struct usb_device *udev)
{
      struct ieee80211_hw *hw;
      struct at76_priv *priv;

      hw = ieee80211_alloc_hw(sizeof(struct at76_priv), &at76_ops);
      if (!hw) {
            printk(KERN_ERR DRIVER_NAME ": could not register"
                   " ieee80211_hw\n");
            return NULL;
      }

      priv = hw->priv;
      priv->hw = hw;

      priv->udev = udev;

      mutex_init(&priv->mtx);
      INIT_WORK(&priv->work_set_promisc, at76_work_set_promisc);
      INIT_WORK(&priv->work_submit_rx, at76_work_submit_rx);
      INIT_DELAYED_WORK(&priv->dwork_hw_scan, at76_dwork_hw_scan);

      tasklet_init(&priv->rx_tasklet, at76_rx_tasklet, 0);

      priv->pm_mode = AT76_PM_OFF;
      priv->pm_period = 0;

      /* unit us */
      priv->hw->channel_change_time = 100000;

      return priv;
}

static int at76_alloc_urbs(struct at76_priv *priv,
                     struct usb_interface *interface)
{
      struct usb_endpoint_descriptor *endpoint, *ep_in, *ep_out;
      int i;
      int buffer_size;
      struct usb_host_interface *iface_desc;

      at76_dbg(DBG_PROC_ENTRY, "%s: ENTER", __func__);

      at76_dbg(DBG_URB, "%s: NumEndpoints %d ", __func__,
             interface->altsetting[0].desc.bNumEndpoints);

      ep_in = NULL;
      ep_out = NULL;
      iface_desc = interface->cur_altsetting;
      for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
            endpoint = &iface_desc->endpoint[i].desc;

            at76_dbg(DBG_URB, "%s: %d. endpoint: addr 0x%x attr 0x%x",
                   __func__, i, endpoint->bEndpointAddress,
                   endpoint->bmAttributes);

            if (!ep_in && usb_endpoint_is_bulk_in(endpoint))
                  ep_in = endpoint;

            if (!ep_out && usb_endpoint_is_bulk_out(endpoint))
                  ep_out = endpoint;
      }

      if (!ep_in || !ep_out) {
            dev_printk(KERN_ERR, &interface->dev,
                     "bulk endpoints missing\n");
            return -ENXIO;
      }

      priv->rx_pipe = usb_rcvbulkpipe(priv->udev, ep_in->bEndpointAddress);
      priv->tx_pipe = usb_sndbulkpipe(priv->udev, ep_out->bEndpointAddress);

      priv->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
      priv->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!priv->rx_urb || !priv->tx_urb) {
            dev_printk(KERN_ERR, &interface->dev, "cannot allocate URB\n");
            return -ENOMEM;
      }

      buffer_size = sizeof(struct at76_tx_buffer) + MAX_PADDING_SIZE;
      priv->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
      if (!priv->bulk_out_buffer) {
            dev_printk(KERN_ERR, &interface->dev,
                     "cannot allocate output buffer\n");
            return -ENOMEM;
      }

      at76_dbg(DBG_PROC_ENTRY, "%s: EXIT", __func__);

      return 0;
}

static struct ieee80211_rate at76_rates[] = {
      { .bitrate = 10, .hw_value = TX_RATE_1MBIT, },
      { .bitrate = 20, .hw_value = TX_RATE_2MBIT, },
      { .bitrate = 55, .hw_value = TX_RATE_5_5MBIT, },
      { .bitrate = 110, .hw_value = TX_RATE_11MBIT, },
};

static struct ieee80211_channel at76_channels[] = {
      { .center_freq = 2412, .hw_value = 1 },
      { .center_freq = 2417, .hw_value = 2 },
      { .center_freq = 2422, .hw_value = 3 },
      { .center_freq = 2427, .hw_value = 4 },
      { .center_freq = 2432, .hw_value = 5 },
      { .center_freq = 2437, .hw_value = 6 },
      { .center_freq = 2442, .hw_value = 7 },
      { .center_freq = 2447, .hw_value = 8 },
      { .center_freq = 2452, .hw_value = 9 },
      { .center_freq = 2457, .hw_value = 10 },
      { .center_freq = 2462, .hw_value = 11 },
      { .center_freq = 2467, .hw_value = 12 },
      { .center_freq = 2472, .hw_value = 13 },
      { .center_freq = 2484, .hw_value = 14 }
};

static struct ieee80211_supported_band at76_supported_band = {
      .channels = at76_channels,
      .n_channels = ARRAY_SIZE(at76_channels),
      .bitrates = at76_rates,
      .n_bitrates = ARRAY_SIZE(at76_rates),
};

/* Register network device and initialize the hardware */
static int at76_init_new_device(struct at76_priv *priv,
                        struct usb_interface *interface)
{
      int ret;

      /* set up the endpoint information */
      /* check out the endpoints */

      at76_dbg(DBG_DEVSTART, "USB interface: %d endpoints",
             interface->cur_altsetting->desc.bNumEndpoints);

      ret = at76_alloc_urbs(priv, interface);
      if (ret < 0)
            goto exit;

      /* MAC address */
      ret = at76_get_hw_config(priv);
      if (ret < 0) {
            dev_printk(KERN_ERR, &interface->dev,
                     "cannot get MAC address\n");
            goto exit;
      }

      priv->domain = at76_get_reg_domain(priv->regulatory_domain);

      priv->channel = DEF_CHANNEL;
      priv->iw_mode = IW_MODE_INFRA;
      priv->rts_threshold = DEF_RTS_THRESHOLD;
      priv->frag_threshold = DEF_FRAG_THRESHOLD;
      priv->short_retry_limit = DEF_SHORT_RETRY_LIMIT;
      priv->txrate = TX_RATE_AUTO;
      priv->preamble_type = PREAMBLE_TYPE_LONG;
      priv->beacon_period = 100;
      priv->auth_mode = WLAN_AUTH_OPEN;
      priv->scan_min_time = DEF_SCAN_MIN_TIME;
      priv->scan_max_time = DEF_SCAN_MAX_TIME;
      priv->scan_mode = SCAN_TYPE_ACTIVE;
      priv->device_unplugged = 0;

      /* mac80211 initialisation */
      priv->hw->wiphy->max_scan_ssids = 1;
      priv->hw->wiphy->max_scan_ie_len = 0;
      priv->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
      priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &at76_supported_band;
      priv->hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
                    IEEE80211_HW_SIGNAL_UNSPEC;
      priv->hw->max_signal = 100;

      SET_IEEE80211_DEV(priv->hw, &interface->dev);
      SET_IEEE80211_PERM_ADDR(priv->hw, priv->mac_addr);

      ret = ieee80211_register_hw(priv->hw);
      if (ret) {
            printk(KERN_ERR "cannot register mac80211 hw (status %d)!\n",
                   ret);
            goto exit;
      }

      priv->mac80211_registered = 1;

      printk(KERN_INFO "%s: USB %s, MAC %s, firmware %d.%d.%d-%d\n",
             wiphy_name(priv->hw->wiphy),
             dev_name(&interface->dev), mac2str(priv->mac_addr),
             priv->fw_version.major, priv->fw_version.minor,
             priv->fw_version.patch, priv->fw_version.build);
      printk(KERN_INFO "%s: regulatory domain 0x%02x: %s\n",
             wiphy_name(priv->hw->wiphy),
             priv->regulatory_domain, priv->domain->name);

exit:
      return ret;
}

static void at76_delete_device(struct at76_priv *priv)
{
      at76_dbg(DBG_PROC_ENTRY, "%s: ENTER", __func__);

      /* The device is gone, don't bother turning it off */
      priv->device_unplugged = 1;

      tasklet_kill(&priv->rx_tasklet);

      if (priv->mac80211_registered) {
            cancel_delayed_work(&priv->dwork_hw_scan);
            flush_workqueue(priv->hw->workqueue);
            ieee80211_unregister_hw(priv->hw);
      }

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

      at76_dbg(DBG_PROC_ENTRY, "%s: unlinked urbs", __func__);

      kfree(priv->bulk_out_buffer);

      del_timer_sync(&ledtrig_tx_timer);

      kfree_skb(priv->rx_skb);

      usb_put_dev(priv->udev);

      at76_dbg(DBG_PROC_ENTRY, "%s: before freeing priv/ieee80211_hw",
             __func__);
      ieee80211_free_hw(priv->hw);

      at76_dbg(DBG_PROC_ENTRY, "%s: EXIT", __func__);
}

static int at76_probe(struct usb_interface *interface,
                  const struct usb_device_id *id)
{
      int ret;
      struct at76_priv *priv;
      struct fwentry *fwe;
      struct usb_device *udev;
      int op_mode;
      int need_ext_fw = 0;
      struct mib_fw_version fwv;
      int board_type = (int)id->driver_info;

      udev = usb_get_dev(interface_to_usbdev(interface));

      /* Load firmware into kernel memory */
      fwe = at76_load_firmware(udev, board_type);
      if (!fwe) {
            ret = -ENOENT;
            goto error;
      }

      op_mode = at76_get_op_mode(udev);

      at76_dbg(DBG_DEVSTART, "opmode %d", op_mode);

      /* we get OPMODE_NONE with 2.4.23, SMC2662W-AR ???
         we get 204 with 2.4.23, Fiberline FL-WL240u (505A+RFMD2958) ??? */

      if (op_mode == OPMODE_HW_CONFIG_MODE) {
            dev_printk(KERN_ERR, &interface->dev,
                     "cannot handle a device in HW_CONFIG_MODE\n");
            ret = -EBUSY;
            goto error;
      }

      if (op_mode != OPMODE_NORMAL_NIC_WITH_FLASH
          && op_mode != OPMODE_NORMAL_NIC_WITHOUT_FLASH) {
            /* download internal firmware part */
            dev_printk(KERN_DEBUG, &interface->dev,
                     "downloading internal firmware\n");
            ret = at76_load_internal_fw(udev, fwe);
            if (ret < 0) {
                  dev_printk(KERN_ERR, &interface->dev,
                           "error %d downloading internal firmware\n",
                           ret);
                  goto error;
            }
            usb_put_dev(udev);
            return ret;
      }

      /* Internal firmware already inside the device.  Get firmware
       * version to test if external firmware is loaded.
       * This works only for newer firmware, e.g. the Intersil 0.90.x
       * says "control timeout on ep0in" and subsequent
       * at76_get_op_mode() fail too :-( */

      /* if version >= 0.100.x.y or device with built-in flash we can
       * query the device for the fw version */
      if ((fwe->fw_version.major > 0 || fwe->fw_version.minor >= 100)
          || (op_mode == OPMODE_NORMAL_NIC_WITH_FLASH)) {
            ret = at76_get_mib(udev, MIB_FW_VERSION, &fwv, sizeof(fwv));
            if (ret < 0 || (fwv.major | fwv.minor) == 0)
                  need_ext_fw = 1;
      } else
            /* No way to check firmware version, reload to be sure */
            need_ext_fw = 1;

      if (need_ext_fw) {
            dev_printk(KERN_DEBUG, &interface->dev,
                     "downloading external firmware\n");

            ret = at76_load_external_fw(udev, fwe);
            if (ret)
                  goto error;

            /* Re-check firmware version */
            ret = at76_get_mib(udev, MIB_FW_VERSION, &fwv, sizeof(fwv));
            if (ret < 0) {
                  dev_printk(KERN_ERR, &interface->dev,
                           "error %d getting firmware version\n", ret);
                  goto error;
            }
      }

      priv = at76_alloc_new_device(udev);
      if (!priv) {
            ret = -ENOMEM;
            goto error;
      }

      usb_set_intfdata(interface, priv);

      memcpy(&priv->fw_version, &fwv, sizeof(struct mib_fw_version));
      priv->board_type = board_type;

      ret = at76_init_new_device(priv, interface);
      if (ret < 0)
            at76_delete_device(priv);

      return ret;

error:
      usb_put_dev(udev);
      return ret;
}

static void at76_disconnect(struct usb_interface *interface)
{
      struct at76_priv *priv;

      priv = usb_get_intfdata(interface);
      usb_set_intfdata(interface, NULL);

      /* Disconnect after loading internal firmware */
      if (!priv)
            return;

      printk(KERN_INFO "%s: disconnecting\n", wiphy_name(priv->hw->wiphy));
      at76_delete_device(priv);
      dev_printk(KERN_INFO, &interface->dev, "disconnected\n");
}

/* Structure for registering this driver with the USB subsystem */
static struct usb_driver at76_driver = {
      .name = DRIVER_NAME,
      .probe = at76_probe,
      .disconnect = at76_disconnect,
      .id_table = dev_table,
};

static int __init at76_mod_init(void)
{
      int result;

      printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION " loading\n");

      mutex_init(&fw_mutex);

      /* register this driver with the USB subsystem */
      result = usb_register(&at76_driver);
      if (result < 0)
            printk(KERN_ERR DRIVER_NAME
                   ": usb_register failed (status %d)\n", result);

      led_trigger_register_simple("at76_usb-tx", &ledtrig_tx);
      return result;
}

static void __exit at76_mod_exit(void)
{
      int i;

      printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION " unloading\n");
      usb_deregister(&at76_driver);
      for (i = 0; i < ARRAY_SIZE(firmwares); i++) {
            if (firmwares[i].fw)
                  release_firmware(firmwares[i].fw);
      }
      led_trigger_unregister_simple(ledtrig_tx);
}

module_param_named(debug, at76_debug, uint, 0600);
MODULE_PARM_DESC(debug, "Debugging level");

module_init(at76_mod_init);
module_exit(at76_mod_exit);

MODULE_AUTHOR("Oliver Kurth <oku@masqmail.cx>");
MODULE_AUTHOR("Joerg Albert <joerg.albert@gmx.de>");
MODULE_AUTHOR("Alex <alex@foogod.com>");
MODULE_AUTHOR("Nick Jones");
MODULE_AUTHOR("Balint Seeber <n0_5p4m_p13453@hotmail.com>");
MODULE_AUTHOR("Pavel Roskin <proski@gnu.org>");
MODULE_AUTHOR("Guido Guenther <agx@sigxcpu.org>");
MODULE_AUTHOR("Kalle Valo <kalle.valo@iki.fi>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

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