/*      $OpenBSD: if_atu.c,v 1.135 2024/05/23 03:21:08 jsg Exp $ */
/*
 * Copyright (c) 2003, 2004
 *      Daan Vreeken <Danovitsch@Vitsch.net>.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Daan Vreeken.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Daan Vreeken AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL Daan Vreeken OR THE VOICES IN HIS HEAD
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Atmel AT76c503 / AT76c503a / AT76c505 / AT76c505a  USB WLAN driver
 * version 0.5 - 2004-08-03
 *
 * Originally written by Daan Vreeken <Danovitsch @ Vitsch . net>
 *  http://vitsch.net/bsd/atuwi
 *
 * Contributed to by :
 *  Chris Whitehouse, Alistair Phillips, Peter Pilka, Martijn van Buul,
 *  Suihong Liang, Arjan van Leeuwen, Stuart Walsh
 *
 * Ported to OpenBSD by Theo de Raadt and David Gwynne.
 */

#include "bpfilter.h"

#include <sys/param.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/device.h>

#include <machine/bus.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdivar.h>

#include <dev/usb/usbdevs.h>

#if NBPFILTER > 0
#include <net/bpf.h>
#endif

#include <net/if.h>
#include <net/if_media.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>

#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_radiotap.h>

#include <dev/usb/if_atureg.h>

#ifdef ATU_DEBUG
#define DPRINTF(x)      do { if (atudebug) printf x; } while (0)
#define DPRINTFN(n,x)   do { if (atudebug>(n)) printf x; } while (0)
int atudebug = 1;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

int atu_match(struct device *, void *, void *);
void atu_attach(struct device *, struct device *, void *);
int atu_detach(struct device *, int);

struct cfdriver atu_cd = {
        NULL, "atu", DV_IFNET
};

const struct cfattach atu_ca = {
        sizeof(struct atu_softc), atu_match, atu_attach, atu_detach
};

/*
 * Various supported device vendors/products/radio type.
 */
struct atu_type atu_devs[] = {
        { USB_VENDOR_3COM,      USB_PRODUCT_3COM_3CRSHEW696,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_ABOCOM,    USB_PRODUCT_ABOCOM_BWU613,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_ACCTON,    USB_PRODUCT_ACCTON_2664W,
          AT76C503_rfmd_acc,    ATU_NO_QUIRK },
        { USB_VENDOR_ACERP,     USB_PRODUCT_ACERP_AWL300,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_ACERP,     USB_PRODUCT_ACERP_AWL400,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_ACTIONTEC, USB_PRODUCT_ACTIONTEC_802UAT1,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_ADDTRON,   USB_PRODUCT_ADDTRON_AWU120,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_AINCOMM,   USB_PRODUCT_AINCOMM_AWU2000B,
          RadioRFMD2958,        ATU_NO_QUIRK },
        { USB_VENDOR_ASKEY,     USB_PRODUCT_ASKEY_VOYAGER1010,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_ASKEY,     USB_PRODUCT_ASKEY_WLL013I,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_ASKEY,     USB_PRODUCT_ASKEY_WLL013,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_ATMEL,     USB_PRODUCT_ATMEL_AT76C503I1,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_ATMEL,     USB_PRODUCT_ATMEL_AT76C503I2,
          AT76C503_i3863,       ATU_NO_QUIRK },
        { USB_VENDOR_ATMEL,     USB_PRODUCT_ATMEL_AT76C503RFMD,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_ATMEL,     USB_PRODUCT_ATMEL_AT76C505RFMD,
          AT76C505_rfmd,        ATU_NO_QUIRK },
        { USB_VENDOR_ATMEL,     USB_PRODUCT_ATMEL_AT76C505RFMD2958,
          RadioRFMD2958,        ATU_NO_QUIRK },
        { USB_VENDOR_ATMEL,     USB_PRODUCT_ATMEL_AT76C505A, /* SMC2662 V.4 */
          RadioRFMD2958_SMC,    ATU_QUIRK_NO_REMAP | ATU_QUIRK_FW_DELAY },
        { USB_VENDOR_ATMEL,     USB_PRODUCT_ATMEL_AT76C505AS, /* quirk? */
          RadioRFMD2958_SMC,    ATU_QUIRK_NO_REMAP | ATU_QUIRK_FW_DELAY },
        { USB_VENDOR_ATMEL,     USB_PRODUCT_ATMEL_WN210,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_BELKIN,    USB_PRODUCT_BELKIN_F5D6050,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_CONCEPTRONIC, USB_PRODUCT_CONCEPTRONIC_C11U,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_CONCEPTRONIC, USB_PRODUCT_CONCEPTRONIC_WL210,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_COMPAQ,    USB_PRODUCT_COMPAQ_IPAQWLAN,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_COREGA,    USB_PRODUCT_COREGA_WLUSB_11_STICK,
          RadioRFMD2958,        ATU_NO_QUIRK },
        { USB_VENDOR_DICKSMITH, USB_PRODUCT_DICKSMITH_CHUSB611G,
          RadioRFMD2958,        ATU_NO_QUIRK },
        { USB_VENDOR_DICKSMITH, USB_PRODUCT_DICKSMITH_WL200U,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_DICKSMITH, USB_PRODUCT_DICKSMITH_WL240U,
          RadioRFMD2958,        ATU_NO_QUIRK },
        { USB_VENDOR_DICKSMITH, USB_PRODUCT_DICKSMITH_XH1153,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_DLINK,     USB_PRODUCT_DLINK_DWL120E,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_GIGABYTE,  USB_PRODUCT_GIGABYTE_GNWLBM101,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_GIGASET,   USB_PRODUCT_GIGASET_WLAN, /* quirk? */
          RadioRFMD2958_SMC,    ATU_QUIRK_NO_REMAP | ATU_QUIRK_FW_DELAY },
        { USB_VENDOR_HP,        USB_PRODUCT_HP_HN210W,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_INTEL,     USB_PRODUCT_INTEL_AP310,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_IODATA,    USB_PRODUCT_IODATA_USBWNB11A,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_LEXAR,     USB_PRODUCT_LEXAR_2662WAR,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_LINKSYS,   USB_PRODUCT_LINKSYS_WUSB11,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_LINKSYS2,  USB_PRODUCT_LINKSYS2_NWU11B,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_LINKSYS3,  USB_PRODUCT_LINKSYS3_WUSB11V28,
          RadioRFMD2958,        ATU_NO_QUIRK },
        { USB_VENDOR_MSI,       USB_PRODUCT_MSI_WLAN,
          RadioRFMD2958,        ATU_NO_QUIRK },
        { USB_VENDOR_NETGEAR2,  USB_PRODUCT_NETGEAR2_MA101,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_NETGEAR2,  USB_PRODUCT_NETGEAR2_MA101B,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_OQO,       USB_PRODUCT_OQO_WIFI01,
          RadioRFMD2958_SMC,    ATU_QUIRK_NO_REMAP | ATU_QUIRK_FW_DELAY },
        { USB_VENDOR_PLANEX2,   USB_PRODUCT_PLANEX2_GW_US11S,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_SAMSUNG,   USB_PRODUCT_SAMSUNG_SWL2100W,
          AT76C503_i3863,       ATU_NO_QUIRK },
        { USB_VENDOR_SIEMENS2,  USB_PRODUCT_SIEMENS2_WLL013,
          RadioRFMD,            ATU_NO_QUIRK },
        { USB_VENDOR_SMC3,      USB_PRODUCT_SMC3_2662WV1,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_SMC3,      USB_PRODUCT_SMC3_2662WV2,
          AT76C503_rfmd_acc,    ATU_NO_QUIRK },
        { USB_VENDOR_TEKRAM,    USB_PRODUCT_TEKRAM_U300C,
          RadioIntersil,        ATU_NO_QUIRK },
        { USB_VENDOR_ZCOM,      USB_PRODUCT_ZCOM_M4Y750,
          RadioIntersil,        ATU_NO_QUIRK },
};

struct atu_radfirm {
        enum    atu_radio_type atur_type;
        char    *atur_internal;
        char    *atur_external;
        u_int8_t max_rssi;
} atu_radfirm[] = {
        { RadioRFMD,            "atu-rfmd-int",         "atu-rfmd-ext", 0 },
        { RadioRFMD2958,        "atu-rfmd2958-int",     "atu-rfmd2958-ext", 81 },
        { RadioRFMD2958_SMC,    "atu-rfmd2958smc-int",  "atu-rfmd2958smc-ext", 0 },
        { RadioIntersil,        "atu-intersil-int",     "atu-intersil-ext", 0 },
        {
                AT76C503_i3863,
                "atu-at76c503-i3863-int",
                "atu-at76c503-i3863-ext",
                0
        },
        {
                AT76C503_rfmd_acc,
                "atu-at76c503-rfmd-acc-int",
                "atu-at76c503-rfmd-acc-ext",
                0
        },
        {
                AT76C505_rfmd,
                "atu-at76c505-rfmd-int",
                "atu-at76c505-rfmd-ext",
                0
        }
};

int     atu_newbuf(struct atu_softc *, struct atu_chain *, struct mbuf *);
void    atu_rxeof(struct usbd_xfer *, void *, usbd_status);
void    atu_txeof(struct usbd_xfer *, void *, usbd_status);
void    atu_start(struct ifnet *);
int     atu_ioctl(struct ifnet *, u_long, caddr_t);
int     atu_init(struct ifnet *);
void    atu_stop(struct ifnet *, int);
void    atu_watchdog(struct ifnet *);
usbd_status atu_usb_request(struct atu_softc *sc, u_int8_t type,
            u_int8_t request, u_int16_t value, u_int16_t index,
            u_int16_t length, u_int8_t *data);
int     atu_send_command(struct atu_softc *sc, u_int8_t *command, int size);
int     atu_get_cmd_status(struct atu_softc *sc, u_int8_t cmd,
            u_int8_t *status);
int     atu_wait_completion(struct atu_softc *sc, u_int8_t cmd,
            u_int8_t *status);
int     atu_send_mib(struct atu_softc *sc, u_int8_t type,
            u_int8_t size, u_int8_t index, void *data);
int     atu_get_mib(struct atu_softc *sc, u_int8_t type,
            u_int8_t size, u_int8_t index, u_int8_t *buf);
#if 0
int     atu_start_ibss(struct atu_softc *sc);
#endif
int     atu_start_scan(struct atu_softc *sc);
int     atu_switch_radio(struct atu_softc *sc, int state);
int     atu_initial_config(struct atu_softc *sc);
int     atu_join(struct atu_softc *sc, struct ieee80211_node *node);
int8_t  atu_get_dfu_state(struct atu_softc *sc);
u_int8_t atu_get_opmode(struct atu_softc *sc, u_int8_t *mode);
void    atu_internal_firmware(struct device *);
void    atu_external_firmware(struct device *);
int     atu_get_card_config(struct atu_softc *sc);
int     atu_media_change(struct ifnet *ifp);
void    atu_media_status(struct ifnet *ifp, struct ifmediareq *req);
int     atu_tx_list_init(struct atu_softc *);
int     atu_rx_list_init(struct atu_softc *);
void    atu_xfer_list_free(struct atu_softc *sc, struct atu_chain *ch,
            int listlen);

void atu_task(void *);
int atu_newstate(struct ieee80211com *, enum ieee80211_state, int);
int atu_tx_start(struct atu_softc *, struct ieee80211_node *,
    struct atu_chain *, struct mbuf *);
void atu_complete_attach(struct atu_softc *);
u_int8_t atu_calculate_padding(int);

usbd_status
atu_usb_request(struct atu_softc *sc, u_int8_t type,
    u_int8_t request, u_int16_t value, u_int16_t index, u_int16_t length,
    u_int8_t *data)
{
        usb_device_request_t    req;
        struct usbd_xfer        *xfer;
        usbd_status             err;
        int                     total_len = 0, s;

        req.bmRequestType = type;
        req.bRequest = request;
        USETW(req.wValue, value);
        USETW(req.wIndex, index);
        USETW(req.wLength, length);

#ifdef ATU_DEBUG
        if (atudebug) {
                if ((data == NULL) || (type & UT_READ)) {
                        DPRINTFN(20, ("%s: req=%02x val=%02x ind=%02x "
                            "len=%02x\n", sc->atu_dev.dv_xname, request,
                            value, index, length));
                } else {
                        DPRINTFN(20, ("%s: req=%02x val=%02x ind=%02x "
                            "len=%02x [%8D]\n", sc->atu_dev.dv_xname,
                            request, value, index, length, data, " "));
                }
        }
#endif /* ATU_DEBUG */

        s = splnet();

        xfer = usbd_alloc_xfer(sc->atu_udev);
        usbd_setup_default_xfer(xfer, sc->atu_udev, 0, 500000, &req, data,
            length, USBD_SHORT_XFER_OK | USBD_SYNCHRONOUS, 0);

        err = usbd_transfer(xfer);

        usbd_get_xfer_status(xfer, NULL, NULL, &total_len, NULL);

#ifdef ATU_DEBUG
        if (atudebug) {
                if (type & UT_READ) {
                        DPRINTFN(20, ("%s: transferred 0x%x bytes in\n",
                            sc->atu_dev.dv_xname, total_len));
                        DPRINTFN(20, ("%s: dump [%10D]\n",
                            sc->atu_dev.dv_xname, data, " "));
                } else {
                        if (total_len != length)
                                DPRINTF(("%s: ARG! wrote only %x bytes\n",
                                    sc->atu_dev.dv_xname, total_len));
                }
        }
#endif /* ATU_DEBUG */

        usbd_free_xfer(xfer);

        splx(s);
        return(err);
}

int
atu_send_command(struct atu_softc *sc, u_int8_t *command, int size)
{
        return atu_usb_request(sc, UT_WRITE_VENDOR_DEVICE, 0x0e, 0x0000,
            0x0000, size, command);
}

int
atu_get_cmd_status(struct atu_softc *sc, u_int8_t cmd, u_int8_t *status)
{
        /*
         * all other drivers (including Windoze) request 40 bytes of status
         * and get a short-xfer of just 6 bytes. we can save 34 bytes of
         * buffer if we just request those 6 bytes in the first place :)
         */
        /*
        return atu_usb_request(sc, UT_READ_VENDOR_INTERFACE, 0x22, cmd,
            0x0000, 40, status);
        */
        return atu_usb_request(sc, UT_READ_VENDOR_INTERFACE, 0x22, cmd,
            0x0000, 6, status);
}

int
atu_wait_completion(struct atu_softc *sc, u_int8_t cmd, u_int8_t *status)
{
        int                     idle_count = 0, err;
        u_int8_t                statusreq[6];

        DPRINTFN(15, ("%s: wait-completion: cmd=%02x\n",
            sc->atu_dev.dv_xname, cmd));

        while (1) {
                err = atu_get_cmd_status(sc, cmd, statusreq);
                if (err)
                        return err;

#ifdef ATU_DEBUG
                if (atudebug) {
                        DPRINTFN(20, ("%s: status=%s cmd=%02x\n",
                            sc->atu_dev.dv_xname,
                        ether_sprintf(statusreq), cmd));
                }
#endif /* ATU_DEBUG */

                /*
                 * during normal operations waiting on STATUS_IDLE
                 * will never happen more than once
                 */
                if ((statusreq[5] == STATUS_IDLE) && (idle_count++ > 20)) {
                        DPRINTF(("%s: AAARRGGG!!! FIX ME!\n",
                            sc->atu_dev.dv_xname));
                        return 0;
                }

                if ((statusreq[5] != STATUS_IN_PROGRESS) &&
                    (statusreq[5] != STATUS_IDLE)) {
                        if (status != NULL)
                                *status = statusreq[5];
                        return 0;
                }
                usbd_delay_ms(sc->atu_udev, 25);
        }
}

int
atu_send_mib(struct atu_softc *sc, u_int8_t type, u_int8_t size,
    u_int8_t index, void *data)
{
        int                             err;
        struct atu_cmd_set_mib          request;

        /*
         * We don't construct a MIB packet first and then memcpy it into an
         * Atmel-command-packet, we just construct it the right way at once :)
         */

        memset(&request, 0, sizeof(request));

        request.AtCmd = CMD_SET_MIB;
        USETW(request.AtSize, size + 4);

        request.MIBType = type;
        request.MIBSize = size;
        request.MIBIndex = index;
        request.MIBReserved = 0;

        /*
         * For 1 and 2 byte requests we assume a direct value,
         * everything bigger than 2 bytes we assume a pointer to the data
         */
        switch (size) {
        case 0:
                break;
        case 1:
                request.data[0]=(long)data & 0x000000ff;
                break;
        case 2:
                request.data[0]=(long)data & 0x000000ff;
                request.data[1]=(long)data >> 8;
                break;
        default:
                memcpy(request.data, data, size);
                break;
        }

        err = atu_usb_request(sc, UT_WRITE_VENDOR_DEVICE, 0x0e, 0x0000,
            0x0000, size+8, (uByte *)&request);
        if (err)
                return (err);

        DPRINTFN(15, ("%s: sendmib : waitcompletion...\n",
            sc->atu_dev.dv_xname));
        return atu_wait_completion(sc, CMD_SET_MIB, NULL);
}

int
atu_get_mib(struct atu_softc *sc, u_int8_t type, u_int8_t size,
    u_int8_t index, u_int8_t *buf)
{

        /* linux/at76c503.c - 478 */
        return atu_usb_request(sc, UT_READ_VENDOR_INTERFACE, 0x033,
            type << 8, index, size, buf);
}

#if 0
int
atu_start_ibss(struct atu_softc *sc)
{
        int                             err;
        struct atu_cmd_start_ibss       Request;

        Request.Cmd = CMD_START_IBSS;
        Request.Reserved = 0;
        Request.Size = sizeof(Request) - 4;

        memset(Request.BSSID, 0x00, sizeof(Request.BSSID));
        memset(Request.SSID, 0x00, sizeof(Request.SSID));
        memcpy(Request.SSID, sc->atu_ssid, sc->atu_ssidlen);
        Request.SSIDSize = sc->atu_ssidlen;
        if (sc->atu_desired_channel != IEEE80211_CHAN_ANY)
                Request.Channel = (u_int8_t)sc->atu_desired_channel;
        else
                Request.Channel = ATU_DEFAULT_CHANNEL;
        Request.BSSType = AD_HOC_MODE;
        memset(Request.Res, 0x00, sizeof(Request.Res));

        /* Write config to adapter */
        err = atu_send_command(sc, (u_int8_t *)&Request, sizeof(Request));
        if (err) {
                DPRINTF(("%s: start ibss failed!\n",
                    sc->atu_dev.dv_xname));
                return err;
        }

        /* Wait for the adapter to do its thing */
        err = atu_wait_completion(sc, CMD_START_IBSS, NULL);
        if (err) {
                DPRINTF(("%s: error waiting for start_ibss\n",
                    sc->atu_dev.dv_xname));
                return err;
        }

        /* Get the current BSSID */
        err = atu_get_mib(sc, MIB_MAC_MGMT__CURRENT_BSSID, sc->atu_bssid);
        if (err) {
                DPRINTF(("%s: could not get BSSID!\n",
                    sc->atu_dev.dv_xname));
                return err;
        }

        DPRINTF(("%s: started a new IBSS (BSSID=%s)\n",
            sc->atu_dev.dv_xname, ether_sprintf(sc->atu_bssid)));
        return 0;
}
#endif

int
atu_start_scan(struct atu_softc *sc)
{
        struct ieee80211com             *ic = &sc->sc_ic;
        struct atu_cmd_do_scan          Scan;
        usbd_status                     err;
        int                             Cnt;

        memset(&Scan, 0, sizeof(Scan));

        Scan.Cmd = CMD_START_SCAN;
        Scan.Reserved = 0;
        USETW(Scan.Size, sizeof(Scan) - 4);

        /* use the broadcast BSSID (in active scan) */
        for (Cnt=0; Cnt<6; Cnt++)
                Scan.BSSID[Cnt] = 0xff;

        memcpy(Scan.SSID, ic->ic_des_essid, ic->ic_des_esslen);
        Scan.SSID_Len = ic->ic_des_esslen;

        /* default values for scan */
        Scan.ScanType = ATU_SCAN_ACTIVE;
        if (sc->atu_desired_channel != IEEE80211_CHAN_ANY)
                Scan.Channel = (u_int8_t)sc->atu_desired_channel;
        else
                Scan.Channel = sc->atu_channel;

        /* we like scans to be quick :) */
        /* the time we wait before sending probe's */
        USETW(Scan.ProbeDelay, 0);
        /* the time we stay on one channel */
        USETW(Scan.MinChannelTime, 100);
        USETW(Scan.MaxChannelTime, 200);
        /* whether or not we scan all channels */
        Scan.InternationalScan = 0xc1;

#ifdef ATU_DEBUG
        if (atudebug) {
                DPRINTFN(20, ("%s: scan cmd len=%02x\n",
                    sc->atu_dev.dv_xname, sizeof(Scan)));
                DPRINTFN(20, ("%s: scan cmd: %52D\n", sc->atu_dev.dv_xname,
                    (u_int8_t *)&Scan, " "));
        }
#endif /* ATU_DEBUG */

        /* Write config to adapter */
        err = atu_send_command(sc, (u_int8_t *)&Scan, sizeof(Scan));
        if (err)
                return err;

        /*
         * We don't wait for the command to finish... the mgmt-thread will do
         * that for us
         */
        /*
        err = atu_wait_completion(sc, CMD_START_SCAN, NULL);
        if (err)
                return err;
        */
        return 0;
}

int
atu_switch_radio(struct atu_softc *sc, int state)
{
        usbd_status             err;
        struct atu_cmd          CmdRadio;

        if (sc->atu_radio == RadioIntersil) {
                /*
                 * Intersil doesn't seem to need/support switching the radio
                 * on/off
                 */
                return 0;
        }

        memset(&CmdRadio, 0, sizeof(CmdRadio));
        CmdRadio.Cmd = CMD_RADIO_ON;

        if (sc->atu_radio_on != state) {
                if (state == 0)
                        CmdRadio.Cmd = CMD_RADIO_OFF;

                err = atu_send_command(sc, (u_int8_t *)&CmdRadio,
                    sizeof(CmdRadio));
                if (err)
                        return err;

                err = atu_wait_completion(sc, CmdRadio.Cmd, NULL);
                if (err)
                        return err;

                DPRINTFN(10, ("%s: radio turned %s\n",
                    sc->atu_dev.dv_xname, state ? "on" : "off"));
                sc->atu_radio_on = state;
        }
        return 0;
}

int
atu_initial_config(struct atu_softc *sc)
{
        struct ieee80211com             *ic = &sc->sc_ic;
        u_int32_t                       i;
        usbd_status                     err;
/*      u_int8_t                        rates[4] = {0x82, 0x84, 0x8B, 0x96};*/
        u_int8_t                        rates[4] = {0x82, 0x04, 0x0B, 0x16};
        struct atu_cmd_card_config      cmd;
        u_int8_t                        reg_domain;

        DPRINTFN(10, ("%s: sending mac-addr\n", sc->atu_dev.dv_xname));
        err = atu_send_mib(sc, MIB_MAC_ADDR__ADDR, ic->ic_myaddr);
        if (err) {
                DPRINTF(("%s: error setting mac-addr\n",
                    sc->atu_dev.dv_xname));
                return err;
        }

        /*
        DPRINTF(("%s: sending reg-domain\n", sc->atu_dev.dv_xname));
        err = atu_send_mib(sc, MIB_PHY__REG_DOMAIN, NR(0x30));
        if (err) {
                DPRINTF(("%s: error setting mac-addr\n",
                    sc->atu_dev.dv_xname));
                return err;
        }
        */

        memset(&cmd, 0, sizeof(cmd));
        cmd.Cmd = CMD_STARTUP;
        cmd.Reserved = 0;
        USETW(cmd.Size, sizeof(cmd) - 4);

        if (sc->atu_desired_channel != IEEE80211_CHAN_ANY)
                cmd.Channel = (u_int8_t)sc->atu_desired_channel;
        else
                cmd.Channel = sc->atu_channel;
        cmd.AutoRateFallback = 1;
        memcpy(cmd.BasicRateSet, rates, 4);

        /* ShortRetryLimit should be 7 according to 802.11 spec */
        cmd.ShortRetryLimit = 7;
        USETW(cmd.RTS_Threshold, 2347);
        USETW(cmd.FragThreshold, 2346);

        /* Doesn't seem to work, but we'll set it to 1 anyway */
        cmd.PromiscuousMode = 1;

        /* this goes into the beacon we transmit */
        cmd.PrivacyInvoked = (ic->ic_flags & IEEE80211_F_WEPON) ? 1 : 0;

        cmd.ExcludeUnencrypted = 0;
        switch (ic->ic_nw_keys[ic->ic_wep_txkey].k_cipher) {
        case IEEE80211_CIPHER_WEP40:
                cmd.EncryptionType = ATU_WEP_40BITS;
                break;
        case IEEE80211_CIPHER_WEP104:
                cmd.EncryptionType = ATU_WEP_104BITS;
                break;
        default:
                cmd.EncryptionType = ATU_WEP_OFF;
                break;
        }

        cmd.WEP_DefaultKeyID = ic->ic_wep_txkey;
        for (i = 0; i < IEEE80211_WEP_NKID; i++) {
                memcpy(cmd.WEP_DefaultKey[i], ic->ic_nw_keys[i].k_key,
                    ic->ic_nw_keys[i].k_len);
        }

        /* Setting the SSID here doesn't seem to do anything */
        memcpy(cmd.SSID, ic->ic_des_essid, ic->ic_des_esslen);
        cmd.SSID_Len = ic->ic_des_esslen;

        cmd.ShortPreamble = 0;
        USETW(cmd.BeaconPeriod, 100);
        /* cmd.BeaconPeriod = 65535; */

        /*
         * TODO:
         * read reg domain MIB_PHY @ 0x17 (1 byte), (reply = 0x30)
         * we should do something useful with this info. right now it's just
         * ignored
         */
        err = atu_get_mib(sc, MIB_PHY__REG_DOMAIN, &reg_domain);
        if (err) {
                DPRINTF(("%s: could not get regdomain!\n",
                    sc->atu_dev.dv_xname));
        } else {
                DPRINTF(("%s: we're in reg domain 0x%x according to the "
                    "adapter\n", sc->atu_dev.dv_xname, reg_domain));
        }

#ifdef ATU_DEBUG
        if (atudebug) {
                DPRINTFN(20, ("%s: configlen=%02x\n", sc->atu_dev.dv_xname,
                    sizeof(cmd)));
                DPRINTFN(20, ("%s: configdata= %108D\n",
                    sc->atu_dev.dv_xname, (u_int8_t *)&cmd, " "));
        }
#endif /* ATU_DEBUG */

        /* Windoze : driver says exclude-unencrypted=1 & encr-type=1 */

        err = atu_send_command(sc, (u_int8_t *)&cmd, sizeof(cmd));
        if (err)
                return err;
        err = atu_wait_completion(sc, CMD_STARTUP, NULL);
        if (err)
                return err;

        /* Turn on radio now */
        err = atu_switch_radio(sc, 1);
        if (err)
                return err;

        /* preamble type = short */
        err = atu_send_mib(sc, MIB_LOCAL__PREAMBLE, NR(PREAMBLE_SHORT));
        if (err)
                return err;

        /* frag = 1536 */
        err = atu_send_mib(sc, MIB_MAC__FRAG, NR(2346));
        if (err)
                return err;

        /* rts = 1536 */
        err = atu_send_mib(sc, MIB_MAC__RTS, NR(2347));
        if (err)
                return err;

        /* auto rate fallback = 1 */
        err = atu_send_mib(sc, MIB_LOCAL__AUTO_RATE_FALLBACK, NR(1));
        if (err)
                return err;

        /* power mode = full on, no power saving */
        err = atu_send_mib(sc, MIB_MAC_MGMT__POWER_MODE,
            NR(POWER_MODE_ACTIVE));
        if (err)
                return err;

        DPRINTFN(10, ("%s: completed initial config\n",
           sc->atu_dev.dv_xname));
        return 0;
}

int
atu_join(struct atu_softc *sc, struct ieee80211_node *node)
{
        struct atu_cmd_join             join;
        u_int8_t                        status;
        usbd_status                     err;

        memset(&join, 0, sizeof(join));

        join.Cmd = CMD_JOIN;
        join.Reserved = 0x00;
        USETW(join.Size, sizeof(join) - 4);

        DPRINTFN(15, ("%s: pre-join sc->atu_bssid=%s\n",
            sc->atu_dev.dv_xname, ether_sprintf(sc->atu_bssid)));
        DPRINTFN(15, ("%s: mode=%d\n", sc->atu_dev.dv_xname,
            sc->atu_mode));
        memcpy(join.bssid, node->ni_bssid, IEEE80211_ADDR_LEN);
        memcpy(join.essid, node->ni_essid, node->ni_esslen);
        join.essid_size = node->ni_esslen;
        if (node->ni_capinfo & IEEE80211_CAPINFO_IBSS)
                join.bss_type = AD_HOC_MODE;
        else
                join.bss_type = INFRASTRUCTURE_MODE;
        join.channel = ieee80211_chan2ieee(&sc->sc_ic, node->ni_chan);

        USETW(join.timeout, ATU_JOIN_TIMEOUT);
        join.reserved = 0x00;

        DPRINTFN(10, ("%s: trying to join BSSID=%s\n",
            sc->atu_dev.dv_xname, ether_sprintf(join.bssid)));
        err = atu_send_command(sc, (u_int8_t *)&join, sizeof(join));
        if (err) {
                DPRINTF(("%s: ERROR trying to join IBSS\n",
                    sc->atu_dev.dv_xname));
                return err;
        }
        err = atu_wait_completion(sc, CMD_JOIN, &status);
        if (err) {
                DPRINTF(("%s: error joining BSS!\n",
                    sc->atu_dev.dv_xname));
                return err;
        }
        if (status != STATUS_COMPLETE) {
                DPRINTF(("%s: error joining... [status=%02x]\n",
                    sc->atu_dev.dv_xname, status));
                return status;
        } else {
                DPRINTFN(10, ("%s: joined BSS\n", sc->atu_dev.dv_xname));
        }
        return err;
}

/*
 * Get the state of the DFU unit
 */
int8_t
atu_get_dfu_state(struct atu_softc *sc)
{
        u_int8_t        state;

        if (atu_usb_request(sc, DFU_GETSTATE, 0, 0, 1, &state))
                return -1;
        return state;
}

/*
 * Get MAC opmode
 */
u_int8_t
atu_get_opmode(struct atu_softc *sc, u_int8_t *mode)
{

        return atu_usb_request(sc, UT_READ_VENDOR_INTERFACE, 0x33, 0x0001,
            0x0000, 1, mode);
}

/*
 * Upload the internal firmware into the device
 */
void
atu_internal_firmware(struct device *self)
{
        struct atu_softc *sc = (struct atu_softc *)self;
        u_char  state, *ptr = NULL, *firm = NULL, status[6];
        int block_size, block = 0, err, i;
        size_t  firm_len, bytes_left = 0;
        char    *name = "unknown-device";

        /*
         * Uploading firmware is done with the DFU (Device Firmware Upgrade)
         * interface. See "Universal Serial Bus - Device Class Specification
         * for Device Firmware Upgrade" pdf for details of the protocol.
         * Maybe this could be moved to a separate 'firmware driver' once more
         * device drivers need it... For now we'll just do it here.
         *
         * Just for your information, the Atmel's DFU descriptor looks like
         * this:
         *
         * 07           size
         * 21           type
         * 01           capabilities : only firmware download, need reset
         *                after download
         * 13 05        detach timeout : max 1299ms between DFU_DETACH and
         *                reset
         * 00 04        max bytes of firmware per transaction : 1024
         */

        /* Choose the right firmware for the device */
        for (i = 0; i < nitems(atu_radfirm); i++)
                if (sc->atu_radio == atu_radfirm[i].atur_type)
                        name = atu_radfirm[i].atur_internal;

        DPRINTF(("%s: loading firmware %s...\n",
            sc->atu_dev.dv_xname, name));
        err = loadfirmware(name, &firm, &firm_len);
        if (err != 0) {
                printf("%s: %s loadfirmware error %d\n",
                    sc->atu_dev.dv_xname, name, err);
                goto fail;
        }

        ptr = firm;
        bytes_left = firm_len;
        state = atu_get_dfu_state(sc);

        while (block >= 0 && state > 0) {
                switch (state) {
                case DFUState_DnLoadSync:
                        /* get DFU status */
                        err = atu_usb_request(sc, DFU_GETSTATUS, 0, 0 , 6,
                            status);
                        if (err) {
                                DPRINTF(("%s: dfu_getstatus failed!\n",
                                    sc->atu_dev.dv_xname));
                                free(firm, M_DEVBUF, firm_len);
                                goto fail;
                        }
                        /* success means state => DnLoadIdle */
                        state = DFUState_DnLoadIdle;
                        continue;
                        break;

                case DFUState_DFUIdle:
                case DFUState_DnLoadIdle:
                        if (bytes_left>=DFU_MaxBlockSize)
                                block_size = DFU_MaxBlockSize;
                        else
                                block_size = bytes_left;
                        DPRINTFN(15, ("%s: firmware block %d\n",
                            sc->atu_dev.dv_xname, block));

                        err = atu_usb_request(sc, DFU_DNLOAD, block++, 0,
                            block_size, ptr);
                        if (err) {
                                DPRINTF(("%s: dfu_dnload failed\n",
                                    sc->atu_dev.dv_xname));
                                free(firm, M_DEVBUF, firm_len);
                                goto fail;
                        }

                        ptr += block_size;
                        bytes_left -= block_size;
                        if (block_size == 0)
                                block = -1;
                        break;

                default:
                        DPRINTFN(20, ("%s: sleeping for a while\n",
                            sc->atu_dev.dv_xname));
                        usbd_delay_ms(sc->atu_udev, 100);
                        break;
                }

                state = atu_get_dfu_state(sc);
        }
        free(firm, M_DEVBUF, firm_len);

        if (state != DFUState_ManifestSync) {
                DPRINTF(("%s: state != manifestsync... eek!\n",
                    sc->atu_dev.dv_xname));
        }

        err = atu_usb_request(sc, DFU_GETSTATUS, 0, 0, 6, status);
        if (err) {
                DPRINTF(("%s: dfu_getstatus failed!\n",
                    sc->atu_dev.dv_xname));
                goto fail;
        }

        DPRINTFN(15, ("%s: sending remap\n", sc->atu_dev.dv_xname));
        err = atu_usb_request(sc, DFU_REMAP, 0, 0, 0, NULL);
        if ((err) && (!ISSET(sc->atu_quirk, ATU_QUIRK_NO_REMAP))) {
                DPRINTF(("%s: remap failed!\n", sc->atu_dev.dv_xname));
                goto fail;
        }

        /* after a lot of trying and measuring I found out the device needs
         * about 56 milliseconds after sending the remap command before
         * it's ready to communicate again. So we'll wait just a little bit
         * longer than that to be sure...
         */
        usbd_delay_ms(sc->atu_udev, 56+100);

        printf("%s: reattaching after firmware upload\n",
            sc->atu_dev.dv_xname);
        usb_needs_reattach(sc->atu_udev);

fail:
        usbd_deactivate(sc->atu_udev);
}

void
atu_external_firmware(struct device *self)
{
        struct atu_softc *sc = (struct atu_softc *)self;
        u_char  *ptr = NULL, *firm = NULL;
        int     block_size, block = 0, err, i;
        size_t  firm_len, bytes_left = 0;
        char    *name = "unknown-device";

        for (i = 0; i < nitems(atu_radfirm); i++)
                if (sc->atu_radio == atu_radfirm[i].atur_type)
                        name = atu_radfirm[i].atur_external;

        DPRINTF(("%s: loading external firmware %s\n",
            sc->atu_dev.dv_xname, name));
        err = loadfirmware(name, &firm, &firm_len);
        if (err != 0) {
                printf("%s: %s loadfirmware error %d\n",
                    sc->atu_dev.dv_xname, name, err);
                return;
        }
        ptr = firm;
        bytes_left = firm_len;

        while (bytes_left) {
                if (bytes_left > 1024)
                        block_size = 1024;
                else
                        block_size = bytes_left;

                DPRINTFN(15, ("%s: block:%d size:%d\n",
                    sc->atu_dev.dv_xname, block, block_size));
                err = atu_usb_request(sc, UT_WRITE_VENDOR_DEVICE, 0x0e,
                    0x0802, block, block_size, ptr);
                if (err) {
                        DPRINTF(("%s: could not load external firmware "
                            "block\n", sc->atu_dev.dv_xname));
                        free(firm, M_DEVBUF, firm_len);
                        return;
                }

                ptr += block_size;
                block++;
                bytes_left -= block_size;
        }
        free(firm, M_DEVBUF, firm_len);

        err = atu_usb_request(sc, UT_WRITE_VENDOR_DEVICE, 0x0e, 0x0802,
            block, 0, NULL);
        if (err) {
                DPRINTF(("%s: could not load last zero-length firmware "
                    "block\n", sc->atu_dev.dv_xname));
                return;
        }

        /*
         * The SMC2662w V.4 seems to require some time to do its thing with
         * the external firmware... 20 ms isn't enough, but 21 ms works 100
         * times out of 100 tries. We'll wait a bit longer just to be sure
         */
        if (sc->atu_quirk & ATU_QUIRK_FW_DELAY)
                usbd_delay_ms(sc->atu_udev, 21 + 100);

        DPRINTFN(10, ("%s: external firmware upload done\n",
            sc->atu_dev.dv_xname));
        /* complete configuration after the firmwares have been uploaded */
        atu_complete_attach(sc);
}

int
atu_get_card_config(struct atu_softc *sc)
{
        struct ieee80211com             *ic = &sc->sc_ic;
        struct atu_rfmd_conf            rfmd_conf;
        struct atu_intersil_conf        intersil_conf;
        int                             err;

        switch (sc->atu_radio) {

        case RadioRFMD:
        case RadioRFMD2958:
        case RadioRFMD2958_SMC:
        case AT76C503_rfmd_acc:
        case AT76C505_rfmd:
                err = atu_usb_request(sc, UT_READ_VENDOR_INTERFACE, 0x33,
                    0x0a02, 0x0000, sizeof(rfmd_conf),
                    (u_int8_t *)&rfmd_conf);
                if (err) {
                        DPRINTF(("%s: could not get rfmd config!\n",
                            sc->atu_dev.dv_xname));
                        return err;
                }
                memcpy(ic->ic_myaddr, rfmd_conf.MACAddr, IEEE80211_ADDR_LEN);
                break;

        case RadioIntersil:
        case AT76C503_i3863:
                err = atu_usb_request(sc, UT_READ_VENDOR_INTERFACE, 0x33,
                    0x0902, 0x0000, sizeof(intersil_conf),
                    (u_int8_t *)&intersil_conf);
                if (err) {
                        DPRINTF(("%s: could not get intersil config!\n",
                            sc->atu_dev.dv_xname));
                        return err;
                }
                memcpy(ic->ic_myaddr, intersil_conf.MACAddr,
                    IEEE80211_ADDR_LEN);
                break;
        }
        return 0;
}

/*
 * Probe for an AT76c503 chip.
 */
int
atu_match(struct device *parent, void *match, void *aux)
{
        struct usb_attach_arg   *uaa = aux;
        int                     i;

        if (uaa->iface == NULL || uaa->configno != ATU_CONFIG_NO)
                return(UMATCH_NONE);

        for (i = 0; i < nitems(atu_devs); i++) {
                struct atu_type *t = &atu_devs[i];

                if (uaa->vendor == t->atu_vid &&
                    uaa->product == t->atu_pid) {
                        return(UMATCH_VENDOR_PRODUCT);
                }
        }
        return(UMATCH_NONE);
}

int
atu_media_change(struct ifnet *ifp)
{
#ifdef ATU_DEBUG
        struct atu_softc        *sc = ifp->if_softc;
#endif /* ATU_DEBUG */
        int                     err;

        DPRINTFN(10, ("%s: atu_media_change\n", sc->atu_dev.dv_xname));

        err = ieee80211_media_change(ifp);
        if (err == ENETRESET) {
                if ((ifp->if_flags & (IFF_RUNNING|IFF_UP)) ==
                    (IFF_RUNNING|IFF_UP))
                        atu_init(ifp);
                err = 0;
        }

        return (err);
}

void
atu_media_status(struct ifnet *ifp, struct ifmediareq *req)
{
#ifdef ATU_DEBUG
        struct atu_softc        *sc = ifp->if_softc;
#endif /* ATU_DEBUG */

        DPRINTFN(10, ("%s: atu_media_status\n", sc->atu_dev.dv_xname));

        ieee80211_media_status(ifp, req);
}

void
atu_task(void *arg)
{
        struct atu_softc        *sc = (struct atu_softc *)arg;
        struct ieee80211com     *ic = &sc->sc_ic;
        struct ifnet            *ifp = &ic->ic_if;
        usbd_status             err;
        int                     s;

        DPRINTFN(10, ("%s: atu_task\n", sc->atu_dev.dv_xname));

        if (usbd_is_dying(sc->atu_udev))
                return;

        switch (sc->sc_cmd) {
        case ATU_C_SCAN:

                err = atu_start_scan(sc);
                if (err) {
                        DPRINTFN(1, ("%s: atu_init: couldn't start scan!\n",
                            sc->atu_dev.dv_xname));
                        return;
                }

                err = atu_wait_completion(sc, CMD_START_SCAN, NULL);
                if (err) {
                        DPRINTF(("%s: atu_init: error waiting for scan\n",
                            sc->atu_dev.dv_xname));
                        return;
                }

                DPRINTF(("%s: ==========================> END OF SCAN!\n",
                    sc->atu_dev.dv_xname));

                s = splnet();
                /* ieee80211_next_scan(ifp); */
                ieee80211_end_scan(ifp);
                splx(s);

                DPRINTF(("%s: ----------------------======> END OF SCAN2!\n",
                    sc->atu_dev.dv_xname));
                break;

        case ATU_C_JOIN:
                atu_join(sc, ic->ic_bss);
        }
}

int
atu_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int arg)
{
        struct ifnet            *ifp = &ic->ic_if;
        struct atu_softc        *sc = ifp->if_softc;
        enum ieee80211_state    ostate = ic->ic_state;

        switch (nstate) {
        case IEEE80211_S_SCAN:
                memcpy(ic->ic_chan_scan, ic->ic_chan_active,
                    sizeof(ic->ic_chan_active));
                ieee80211_node_cleanup(ic, ic->ic_bss);

                /* tell the event thread that we want a scan */
                sc->sc_cmd = ATU_C_SCAN;
                usb_add_task(sc->atu_udev, &sc->sc_task);

                /* handle this ourselves */
                if (ifp->if_flags & IFF_DEBUG)
                        printf("%s: %s -> %s\n", ifp->if_xname,
                            ieee80211_state_name[ic->ic_state],
                            ieee80211_state_name[nstate]);
                ieee80211_set_link_state(ic, LINK_STATE_DOWN);
                ic->ic_state = nstate;
                return (0);

        case IEEE80211_S_AUTH:
        case IEEE80211_S_RUN:
                if (ostate == IEEE80211_S_SCAN) {
                        sc->sc_cmd = ATU_C_JOIN;
                        usb_add_task(sc->atu_udev, &sc->sc_task);
                }
                break;
        default:
                /* nothing to do */
                break;
        }

        return (*sc->sc_newstate)(ic, nstate, arg);
}

/*
 * Attach the interface. Allocate softc structures, do
 * setup and ethernet/BPF attach.
 */
void
atu_attach(struct device *parent, struct device *self, void *aux)
{
        struct atu_softc                *sc = (struct atu_softc *)self;
        struct usb_attach_arg           *uaa = aux;
        usbd_status                     err;
        struct usbd_device              *dev = uaa->device;
        u_int8_t                        mode, channel;
        int i;

        sc->atu_unit = self->dv_unit;
        sc->atu_udev = dev;

        err = usbd_device2interface_handle(dev, ATU_IFACE_IDX, &sc->atu_iface);
        if (err) {
                printf("%s: getting interface handle failed\n",
                    sc->atu_dev.dv_xname);
                goto fail;
        }

        /*
         * look up the radio_type for the device
         * basically does the same as USB_MATCH
         */
        for (i = 0; i < nitems(atu_devs); i++) {
                struct atu_type *t = &atu_devs[i];

                if (uaa->vendor == t->atu_vid &&
                    uaa->product == t->atu_pid) {
                        sc->atu_radio = t->atu_radio;
                        sc->atu_quirk = t->atu_quirk;
                }
        }

        /*
         * Check in the interface descriptor if we're in DFU mode
         * If we're in DFU mode, we upload the external firmware
         * If we're not, the PC must have rebooted without power-cycling
         * the device. I've tried this out, a reboot only requires the
         * external firmware to be reloaded :)
         *
         * Hmm. The at76c505a doesn't report a DFU descriptor when it's
         * in DFU mode... Let's just try to get the opmode
         */
        err = atu_get_opmode(sc, &mode);
        DPRINTFN(20, ("%s: opmode: %d\n", sc->atu_dev.dv_xname, mode));
        if (err || (mode != MODE_NETCARD && mode != MODE_NOFLASHNETCARD)) {
                DPRINTF(("%s: starting internal firmware download\n",
                    sc->atu_dev.dv_xname));

                config_mountroot(self, atu_internal_firmware);
                /*
                 * atu_internal_firmware will cause a reset of the device
                 * so we don't want to do any more configuration after this
                 * point.
                 */
                return;
        }

        uaa->iface = sc->atu_iface;

        if (mode != MODE_NETCARD) {
                DPRINTFN(15, ("%s: device needs external firmware\n",
                    sc->atu_dev.dv_xname));

                if (mode != MODE_NOFLASHNETCARD) {
                        DPRINTF(("%s: EEK! unexpected opmode=%d\n",
                            sc->atu_dev.dv_xname, mode));
                }

                /*
                 * There is no difference in opmode before and after external
                 * firmware upload with the SMC2662 V.4 . So instead we'll try
                 * to read the channel number. If we succeed, external
                 * firmwaremust have been already uploaded...
                 */
                if (sc->atu_radio != RadioIntersil) {
                        err = atu_get_mib(sc, MIB_PHY__CHANNEL, &channel);
                        if (!err) {
                                DPRINTF(("%s: external firmware has already"
                                    " been downloaded\n",
                                    sc->atu_dev.dv_xname));
                                atu_complete_attach(sc);
                                return;
                        }
                }

                config_mountroot(self, atu_external_firmware);

                /*
                 * atu_external_firmware will call atu_complete_attach after
                 * it's finished so we can just return.
                 */
        } else {
                /* all the firmwares are in place, so complete the attach */
                atu_complete_attach(sc);
        }
fail:
        usbd_deactivate(sc->atu_udev);
}

void
atu_complete_attach(struct atu_softc *sc)
{
        struct ieee80211com             *ic = &sc->sc_ic;
        struct ifnet                    *ifp = &ic->ic_if;
        usb_interface_descriptor_t      *id;
        usb_endpoint_descriptor_t       *ed;
        usbd_status                     err;
        int                             i;
#ifdef ATU_DEBUG
        struct atu_fw                   fw;
#endif

        id = usbd_get_interface_descriptor(sc->atu_iface);

        /* Find endpoints. */
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(sc->atu_iface, i);
                if (!ed) {
                        DPRINTF(("%s: num_endp:%d\n", sc->atu_dev.dv_xname,
                            sc->atu_iface->idesc->bNumEndpoints));
                        DPRINTF(("%s: couldn't get ep %d\n",
                            sc->atu_dev.dv_xname, i));
                        goto fail;
                }
                if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->atu_ed[ATU_ENDPT_RX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->atu_ed[ATU_ENDPT_TX] = ed->bEndpointAddress;
                }
        }

        /* read device config & get MAC address */
        err = atu_get_card_config(sc);
        if (err) {
                printf("%s: could not get card cfg!\n",
                    sc->atu_dev.dv_xname);
                goto fail;
        }

#ifdef ATU_DEBUG
        /* DEBUG : try to get firmware version */
        err = atu_get_mib(sc, MIB_FW_VERSION, sizeof(fw), 0,
            (u_int8_t *)&fw);
        if (!err) {
                DPRINTFN(15, ("%s: firmware: maj:%d min:%d patch:%d "
                    "build:%d\n", sc->atu_dev.dv_xname, fw.major, fw.minor,
                    fw.patch, fw.build));
        } else {
                DPRINTF(("%s: get firmware version failed\n",
                    sc->atu_dev.dv_xname));
        }
#endif /* ATU_DEBUG */

        /* Show the world our MAC address */
        printf("%s: address %s\n", sc->atu_dev.dv_xname,
            ether_sprintf(ic->ic_myaddr));

        sc->atu_cdata.atu_tx_inuse = 0;

        bzero(sc->atu_bssid, ETHER_ADDR_LEN);
        sc->atu_channel = ATU_DEFAULT_CHANNEL;
        sc->atu_desired_channel = IEEE80211_CHAN_ANY;
        sc->atu_mode = INFRASTRUCTURE_MODE;

        ic->ic_softc = sc;
        ic->ic_phytype = IEEE80211_T_DS;
        ic->ic_opmode = IEEE80211_M_STA;
        ic->ic_state = IEEE80211_S_INIT;
        ic->ic_caps = IEEE80211_C_IBSS | IEEE80211_C_WEP | IEEE80211_C_SCANALL;
        ic->ic_max_rssi = atu_radfirm[sc->atu_radio].max_rssi;

        ic->ic_sup_rates[IEEE80211_MODE_11B] = ieee80211_std_rateset_11b;

        for (i = 1; i <= 14; i++) {
                ic->ic_channels[i].ic_flags = IEEE80211_CHAN_B |
                    IEEE80211_CHAN_PASSIVE;
                ic->ic_channels[i].ic_freq = ieee80211_ieee2mhz(i,
                    ic->ic_channels[i].ic_flags);
        }

        ic->ic_ibss_chan = &ic->ic_channels[0];

        ifp->if_softc = sc;
        memcpy(ifp->if_xname, sc->atu_dev.dv_xname, IFNAMSIZ);
        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
        ifp->if_start = atu_start;
        ifp->if_ioctl = atu_ioctl;
        ifp->if_watchdog = atu_watchdog;
        ifp->if_mtu = ATU_DEFAULT_MTU;

        /* Call MI attach routine. */
        if_attach(ifp);
        ieee80211_ifattach(ifp);

        sc->sc_newstate = ic->ic_newstate;
        ic->ic_newstate = atu_newstate;

        /* setup ifmedia interface */
        ieee80211_media_init(ifp, atu_media_change, atu_media_status);

        usb_init_task(&sc->sc_task, atu_task, sc, USB_TASK_TYPE_GENERIC);

#if NBPFILTER > 0
        bpfattach(&sc->sc_radiobpf, &sc->sc_ic.ic_if, DLT_IEEE802_11_RADIO,
            sizeof(struct ieee80211_frame) + 64);

        bzero(&sc->sc_rxtapu, sizeof(sc->sc_rxtapu));
        sc->sc_rxtap.rr_ihdr.it_len = sizeof(sc->sc_rxtapu);
        sc->sc_rxtap.rr_ihdr.it_present = htole32(ATU_RX_RADIOTAP_PRESENT);

        bzero(&sc->sc_txtapu, sizeof(sc->sc_txtapu));
        sc->sc_txtap.rt_ihdr.it_len = sizeof(sc->sc_txtapu);
        sc->sc_txtap.rt_ihdr.it_present = htole32(ATU_TX_RADIOTAP_PRESENT);
#endif

fail:
        usbd_deactivate(sc->atu_udev);
}

int
atu_detach(struct device *self, int flags)
{
        struct atu_softc        *sc = (struct atu_softc *)self;
        struct ifnet            *ifp = &sc->sc_ic.ic_if;

        DPRINTFN(10, ("%s: atu_detach\n", sc->atu_dev.dv_xname));

        if (ifp->if_flags & IFF_RUNNING)
                atu_stop(ifp, 1);

        usb_rem_task(sc->atu_udev, &sc->sc_task);

        if (sc->atu_ep[ATU_ENDPT_TX] != NULL)
                usbd_abort_pipe(sc->atu_ep[ATU_ENDPT_TX]);
        if (sc->atu_ep[ATU_ENDPT_RX] != NULL)
                usbd_abort_pipe(sc->atu_ep[ATU_ENDPT_RX]);

        if (ifp->if_softc != NULL) {
                ieee80211_ifdetach(ifp);
                if_detach(ifp);
        }

        return(0);
}

/*
 * Initialize an RX descriptor and attach an MBUF cluster.
 */
int
atu_newbuf(struct atu_softc *sc, struct atu_chain *c, struct mbuf *m)
{
        struct mbuf             *m_new = NULL;

        if (m == NULL) {
                MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                if (m_new == NULL) {
                        DPRINTF(("%s: no memory for rx list\n",
                            sc->atu_dev.dv_xname));
                        return(ENOBUFS);
                }

                MCLGET(m_new, M_DONTWAIT);
                if (!(m_new->m_flags & M_EXT)) {
                        DPRINTF(("%s: no memory for rx list\n",
                            sc->atu_dev.dv_xname));
                        m_freem(m_new);
                        return(ENOBUFS);
                }
                m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
        } else {
                m_new = m;
                m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
                m_new->m_data = m_new->m_ext.ext_buf;
        }
        c->atu_mbuf = m_new;
        return(0);
}

int
atu_rx_list_init(struct atu_softc *sc)
{
        struct atu_cdata        *cd = &sc->atu_cdata;
        struct atu_chain        *c;
        int                     i;

        DPRINTFN(15, ("%s: atu_rx_list_init: enter\n",
            sc->atu_dev.dv_xname));

        for (i = 0; i < ATU_RX_LIST_CNT; i++) {
                c = &cd->atu_rx_chain[i];
                c->atu_sc = sc;
                c->atu_idx = i;
                if (c->atu_xfer == NULL) {
                        c->atu_xfer = usbd_alloc_xfer(sc->atu_udev);
                        if (c->atu_xfer == NULL)
                                return (ENOBUFS);
                        c->atu_buf = usbd_alloc_buffer(c->atu_xfer,
                            ATU_RX_BUFSZ);
                        if (c->atu_buf == NULL) /* XXX free xfer */
                                return (ENOBUFS);
                        if (atu_newbuf(sc, c, NULL) == ENOBUFS) /* XXX free? */
                                return(ENOBUFS);
                }
        }
        return (0);
}

int
atu_tx_list_init(struct atu_softc *sc)
{
        struct atu_cdata        *cd = &sc->atu_cdata;
        struct atu_chain        *c;
        int                     i;

        DPRINTFN(15, ("%s: atu_tx_list_init\n",
            sc->atu_dev.dv_xname));

        SLIST_INIT(&cd->atu_tx_free);
        sc->atu_cdata.atu_tx_inuse = 0;

        for (i = 0; i < ATU_TX_LIST_CNT; i++) {
                c = &cd->atu_tx_chain[i];
                c->atu_sc = sc;
                c->atu_idx = i;
                if (c->atu_xfer == NULL) {
                        c->atu_xfer = usbd_alloc_xfer(sc->atu_udev);
                        if (c->atu_xfer == NULL)
                                return(ENOBUFS);
                        c->atu_mbuf = NULL;
                        c->atu_buf = usbd_alloc_buffer(c->atu_xfer,
                            ATU_TX_BUFSZ);
                        if (c->atu_buf == NULL)
                                return(ENOBUFS); /* XXX free xfer */
                        SLIST_INSERT_HEAD(&cd->atu_tx_free, c, atu_list);
                }
        }
        return(0);
}

void
atu_xfer_list_free(struct atu_softc *sc, struct atu_chain *ch,
    int listlen)
{
        int                     i;

        /* Free resources. */
        for (i = 0; i < listlen; i++) {
                if (ch[i].atu_buf != NULL)
                        ch[i].atu_buf = NULL;
                if (ch[i].atu_mbuf != NULL) {
                        m_freem(ch[i].atu_mbuf);
                        ch[i].atu_mbuf = NULL;
                }
                if (ch[i].atu_xfer != NULL) {
                        usbd_free_xfer(ch[i].atu_xfer);
                        ch[i].atu_xfer = NULL;
                }
        }
}

/*
 * A frame has been uploaded: pass the resulting mbuf chain up to
 * the higher level protocols.
 */
void
atu_rxeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct atu_chain        *c = (struct atu_chain *)priv;
        struct atu_softc        *sc = c->atu_sc;
        struct ieee80211com     *ic = &sc->sc_ic;
        struct ifnet            *ifp = &ic->ic_if;
        struct atu_rx_hdr       *h;
        struct ieee80211_frame  *wh;
        struct ieee80211_rxinfo rxi;
        struct ieee80211_node   *ni;
        struct mbuf             *m;
        u_int32_t               len;
        int                     s;

        DPRINTFN(25, ("%s: atu_rxeof\n", sc->atu_dev.dv_xname));

        if (usbd_is_dying(sc->atu_udev))
                return;

        if ((ifp->if_flags & (IFF_RUNNING|IFF_UP)) != (IFF_RUNNING|IFF_UP))
                goto done;

        if (status != USBD_NORMAL_COMPLETION) {
                DPRINTF(("%s: status != USBD_NORMAL_COMPLETION\n",
                    sc->atu_dev.dv_xname));
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
                        return;
                }
#if 0
                if (status == USBD_IOERROR) {
                        DPRINTF(("%s: rx: EEK! lost device?\n",
                            sc->atu_dev.dv_xname));

                        /*
                         * My experience with USBD_IOERROR is that trying to
                         * restart the transfer will always fail and we'll
                         * keep on looping restarting transfers until someone
                         * pulls the plug of the device.
                         * So we don't restart the transfer, but just let it
                         * die... If someone knows of a situation where we can
                         * recover from USBD_IOERROR, let me know.
                         */
                        splx(s);
                        return;
                }
#endif /* 0 */

                if (usbd_ratecheck(&sc->atu_rx_notice)) {
                        DPRINTF(("%s: usb error on rx: %s\n",
                            sc->atu_dev.dv_xname, usbd_errstr(status)));
                }
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(
                            sc->atu_ep[ATU_ENDPT_RX]);
                goto done;
        }

        usbd_get_xfer_status(xfer, NULL, NULL, &len, NULL);

        if (len < ATU_RX_HDRLEN) {
                DPRINTF(("%s: atu_rxeof: too short\n",
                    sc->atu_dev.dv_xname));
                ic->ic_stats.is_rx_tooshort++;
                ifp->if_ierrors++;
                goto done;
        }

        h = (struct atu_rx_hdr *)c->atu_buf;
        len = UGETW(h->length);
        if (len < IEEE80211_MIN_LEN) {
                ic->ic_stats.is_rx_tooshort++;
                ifp->if_ierrors++;
                goto done;
        }
        if (len > ATU_RX_BUFSZ) {
                ifp->if_ierrors++;
                goto done;
        }
        len -= IEEE80211_CRC_LEN;

        m = c->atu_mbuf;
        memcpy(mtod(m, char *), c->atu_buf + ATU_RX_HDRLEN, len);
        m->m_pkthdr.len = m->m_len = len;

        wh = mtod(m, struct ieee80211_frame *);
        ni = ieee80211_find_rxnode(ic, wh);

        s = splnet();

        if (atu_newbuf(sc, c, NULL) == ENOBUFS) {
                ifp->if_ierrors++;
                goto done1; /* XXX if we can't allocate, why restart it? */
        }

#if NBPFILTER > 0
        if (sc->sc_radiobpf != NULL) {
                struct mbuf mb;
                struct atu_rx_radiotap_header *rr = &sc->sc_rxtap;

                rr->rr_flags = 0;
                rr->rr_chan_freq =
                    htole16(ic->ic_bss->ni_chan->ic_freq);
                rr->rr_chan_flags =
                    htole16(ic->ic_bss->ni_chan->ic_flags);
                rr->rr_rssi = h->rssi;
                rr->rr_max_rssi = ic->ic_max_rssi;

                mb.m_data = (caddr_t)rr;
                mb.m_len = sizeof(sc->sc_txtapu);
                mb.m_next = m;
                mb.m_nextpkt = NULL;
                mb.m_type = 0;
                mb.m_flags = 0;
                bpf_mtap(sc->sc_radiobpf, &mb, BPF_DIRECTION_IN);
        }
#endif /* NBPFILTER > 0 */

        memset(&rxi, 0, sizeof(rxi));
        if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
                /*
                 * WEP is decrypted by hardware. Clear WEP bit
                 * header for ieee80211_input().
                 */
                wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
                rxi.rxi_flags |= IEEE80211_RXI_HWDEC;
        }

        rxi.rxi_rssi = h->rssi;
        rxi.rxi_tstamp = UGETDW(h->rx_time);
        ieee80211_input(ifp, m, ni, &rxi);

done1:
        ieee80211_release_node(ic, ni);
        splx(s);
done:
        /* Setup new transfer. */
        usbd_setup_xfer(c->atu_xfer, sc->atu_ep[ATU_ENDPT_RX], c, c->atu_buf,
            ATU_RX_BUFSZ, USBD_SHORT_XFER_OK | USBD_NO_COPY, USBD_NO_TIMEOUT,
                atu_rxeof);
        usbd_transfer(c->atu_xfer);
}

/*
 * A frame was downloaded to the chip. It's safe for us to clean up
 * the list buffers.
 */
void
atu_txeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct atu_chain        *c = (struct atu_chain *)priv;
        struct atu_softc        *sc = c->atu_sc;
        struct ifnet            *ifp = &sc->sc_ic.ic_if;
        usbd_status             err;
        int                     s;

        DPRINTFN(25, ("%s: atu_txeof status=%d\n", sc->atu_dev.dv_xname,
            status));

        if (c->atu_mbuf != NULL) {
                m_freem(c->atu_mbuf);
                c->atu_mbuf = NULL;
        }

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
                        return;

                DPRINTF(("%s: usb error on tx: %s\n", sc->atu_dev.dv_xname,
                    usbd_errstr(status)));
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->atu_ep[ATU_ENDPT_TX]);
                return;
        }

        usbd_get_xfer_status(c->atu_xfer, NULL, NULL, NULL, &err);

        if (err)
                ifp->if_oerrors++;

        s = splnet();
        SLIST_INSERT_HEAD(&sc->atu_cdata.atu_tx_free, c, atu_list);
        sc->atu_cdata.atu_tx_inuse--;
        if (sc->atu_cdata.atu_tx_inuse == 0)
                ifp->if_timer = 0;
        ifq_clr_oactive(&ifp->if_snd);
        splx(s);

        atu_start(ifp);
}

u_int8_t
atu_calculate_padding(int size)
{
        size %= 64;

        if (size < 50)
                return (50 - size);
        if (size >=61)
                return (64 + 50 - size);
        return (0);
}

int
atu_tx_start(struct atu_softc *sc, struct ieee80211_node *ni,
    struct atu_chain *c, struct mbuf *m)
{
        int                     len;
        struct atu_tx_hdr       *h;
        usbd_status             err;
        u_int8_t                pad;
#if NBPFILTER > 0
        struct ieee80211com *ic = &sc->sc_ic;
#endif

        DPRINTFN(25, ("%s: atu_tx_start\n", sc->atu_dev.dv_xname));

        /* Don't try to send when we're shutting down the driver */
        if (usbd_is_dying(sc->atu_udev)) {
                m_freem(m);
                return(EIO);
        }

#if NBPFILTER > 0
        if (sc->sc_radiobpf != NULL) {
                struct mbuf mb;
                struct atu_tx_radiotap_header *rt = &sc->sc_txtap;

                rt->rt_flags = 0;
                rt->rt_chan_freq =
                    htole16(ic->ic_bss->ni_chan->ic_freq);
                rt->rt_chan_flags =
                    htole16(ic->ic_bss->ni_chan->ic_flags);

                mb.m_data = (caddr_t)rt;
                mb.m_len = sizeof(sc->sc_txtapu);
                mb.m_next = m;
                mb.m_nextpkt = NULL;
                mb.m_type = 0;
                mb.m_flags = 0;
                bpf_mtap(sc->sc_radiobpf, &mb, BPF_DIRECTION_OUT);
        }
#endif

        /*
         * Copy the mbuf data into a contiguous buffer, leaving
         * enough room for the atmel headers
         */
        len = m->m_pkthdr.len;

        m_copydata(m, 0, m->m_pkthdr.len, c->atu_buf + ATU_TX_HDRLEN);

        h = (struct atu_tx_hdr *)c->atu_buf;
        memset(h, 0, ATU_TX_HDRLEN);
        USETW(h->length, len);
        h->tx_rate = 4; /* XXX rate = auto */
        len += ATU_TX_HDRLEN;

        pad = atu_calculate_padding(len);
        len += pad;
        h->padding = pad;

        c->atu_length = len;
        c->atu_mbuf = m;

        usbd_setup_xfer(c->atu_xfer, sc->atu_ep[ATU_ENDPT_TX],
            c, c->atu_buf, c->atu_length, USBD_NO_COPY, ATU_TX_TIMEOUT,
            atu_txeof);

        /* Let's get this thing into the air! */
        c->atu_in_xfer = 1;
        err = usbd_transfer(c->atu_xfer);
        if (err != USBD_IN_PROGRESS) {
                DPRINTFN(25, ("%s: atu_tx_start: err=%d\n",
                    sc->atu_dev.dv_xname, err));
                c->atu_mbuf = NULL;
                m_freem(m);
                return(EIO);
        }

        return (0);
}

void
atu_start(struct ifnet *ifp)
{
        struct atu_softc        *sc = ifp->if_softc;
        struct ieee80211com     *ic = &sc->sc_ic;
        struct atu_cdata        *cd = &sc->atu_cdata;
        struct ieee80211_node   *ni;
        struct ieee80211_frame  *wh;
        struct atu_chain        *c;
        struct mbuf             *m = NULL;
        int                     s;

        DPRINTFN(25, ("%s: atu_start: enter\n", sc->atu_dev.dv_xname));

        if ((ifp->if_flags & (IFF_RUNNING|IFF_UP)) != (IFF_RUNNING|IFF_UP)) {
                DPRINTFN(30, ("%s: atu_start: not running or up\n",
                    sc->atu_dev.dv_xname));
                return;
        }

        if (ifq_is_oactive(&ifp->if_snd)) {
                DPRINTFN(30, ("%s: atu_start: oactive\n",
                    sc->atu_dev.dv_xname));
                return;
        }

        for (;;) {
                /* grab a TX buffer */
                s = splnet();
                c = SLIST_FIRST(&cd->atu_tx_free);
                if (c != NULL) {
                        SLIST_REMOVE_HEAD(&cd->atu_tx_free, atu_list);
                        cd->atu_tx_inuse++;
                        if (cd->atu_tx_inuse == ATU_TX_LIST_CNT)
                                ifq_set_oactive(&ifp->if_snd);
                }
                splx(s);
                if (c == NULL) {
                        DPRINTFN(10, ("%s: out of tx xfers\n",
                            sc->atu_dev.dv_xname));
                        ifq_set_oactive(&ifp->if_snd);
                        break;
                }

                /*
                 * Poll the management queue for frames, it has priority over
                 * normal data frames.
                 */
                m = mq_dequeue(&ic->ic_mgtq);
                if (m == NULL) {
                        DPRINTFN(10, ("%s: atu_start: data packet\n",
                            sc->atu_dev.dv_xname));
                        if (ic->ic_state != IEEE80211_S_RUN) {
                                DPRINTFN(25, ("%s: no data till running\n",
                                    sc->atu_dev.dv_xname));
                                /* put the xfer back on the list */
                                s = splnet();
                                SLIST_INSERT_HEAD(&cd->atu_tx_free, c,
                                    atu_list);
                                cd->atu_tx_inuse--;
                                splx(s);
                                break;
                        }

                        m = ifq_dequeue(&ifp->if_snd);
                        if (m == NULL) {
                                DPRINTFN(25, ("%s: nothing to send\n",
                                    sc->atu_dev.dv_xname));
                                s = splnet();
                                SLIST_INSERT_HEAD(&cd->atu_tx_free, c,
                                    atu_list);
                                cd->atu_tx_inuse--;
                                splx(s);
                                break;
                        }

#if NBPFILTER > 0
                        if (ifp->if_bpf)
                                bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif

                        m = ieee80211_encap(ifp, m, &ni);
                        if (m == NULL)
                                goto bad;
                        wh = mtod(m, struct ieee80211_frame *);

#if NBPFILTER > 0
                        if (ic->ic_rawbpf != NULL)
                                bpf_mtap(ic->ic_rawbpf, m, BPF_DIRECTION_OUT);
#endif
                } else {
                        DPRINTFN(25, ("%s: atu_start: mgmt packet\n",
                            sc->atu_dev.dv_xname));

                        ni = m->m_pkthdr.ph_cookie;

                        wh = mtod(m, struct ieee80211_frame *);
                        /* sc->sc_stats.ast_tx_mgmt++; */
                }

                if (atu_tx_start(sc, ni, c, m)) {
bad:
                        s = splnet();
                        SLIST_INSERT_HEAD(&cd->atu_tx_free, c,
                            atu_list);
                        cd->atu_tx_inuse--;
                        splx(s);
                        /* ifp_if_oerrors++; */
                        if (ni != NULL)
                                ieee80211_release_node(ic, ni);
                        continue;
                }
                ifp->if_timer = 5;
        }
}

int
atu_init(struct ifnet *ifp)
{
        struct atu_softc        *sc = ifp->if_softc;
        struct ieee80211com     *ic = &sc->sc_ic;
        struct atu_chain        *c;
        usbd_status             err;
        int                     i, s;

        s = splnet();

        DPRINTFN(10, ("%s: atu_init\n", sc->atu_dev.dv_xname));

        if (ifp->if_flags & IFF_RUNNING) {
                splx(s);
                return(0);
        }

        /* Init TX ring */
        if (atu_tx_list_init(sc))
                printf("%s: tx list init failed\n", sc->atu_dev.dv_xname);

        /* Init RX ring */
        if (atu_rx_list_init(sc))
                printf("%s: rx list init failed\n", sc->atu_dev.dv_xname);

        /* Load the multicast filter. */
        /*atu_setmulti(sc); */

        /* Open RX and TX pipes. */
        err = usbd_open_pipe(sc->atu_iface, sc->atu_ed[ATU_ENDPT_RX],
            USBD_EXCLUSIVE_USE, &sc->atu_ep[ATU_ENDPT_RX]);
        if (err) {
                DPRINTF(("%s: open rx pipe failed: %s\n",
                    sc->atu_dev.dv_xname, usbd_errstr(err)));
                splx(s);
                return(EIO);
        }

        err = usbd_open_pipe(sc->atu_iface, sc->atu_ed[ATU_ENDPT_TX],
            USBD_EXCLUSIVE_USE, &sc->atu_ep[ATU_ENDPT_TX]);
        if (err) {
                DPRINTF(("%s: open tx pipe failed: %s\n",
                    sc->atu_dev.dv_xname, usbd_errstr(err)));
                splx(s);
                return(EIO);
        }

        /* Start up the receive pipe. */
        for (i = 0; i < ATU_RX_LIST_CNT; i++) {
                c = &sc->atu_cdata.atu_rx_chain[i];

                usbd_setup_xfer(c->atu_xfer, sc->atu_ep[ATU_ENDPT_RX], c,
                    c->atu_buf, ATU_RX_BUFSZ, USBD_SHORT_XFER_OK | USBD_NO_COPY,
                    USBD_NO_TIMEOUT, atu_rxeof);
                usbd_transfer(c->atu_xfer);
        }

        DPRINTFN(10, ("%s: starting up using MAC=%s\n",
            sc->atu_dev.dv_xname, ether_sprintf(ic->ic_myaddr)));

        /* Do initial setup */
        err = atu_initial_config(sc);
        if (err) {
                DPRINTF(("%s: initial config failed!\n",
                    sc->atu_dev.dv_xname));
                splx(s);
                return(EIO);
        }
        DPRINTFN(10, ("%s: initialised transceiver\n",
            sc->atu_dev.dv_xname));

        /* sc->atu_rxfilt = ATU_RXFILT_UNICAST|ATU_RXFILT_BROADCAST; */

        /* If we want promiscuous mode, set the allframes bit. */
        /*
        if (ifp->if_flags & IFF_PROMISC)
                sc->atu_rxfilt |= ATU_RXFILT_PROMISC;
        */

        ifp->if_flags |= IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);
        splx(s);

        /* XXX the following HAS to be replaced */
        s = splnet();
        err = ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
        if (err)
                DPRINTFN(1, ("%s: atu_init: error calling "
                    "ieee80211_net_state", sc->atu_dev.dv_xname));
        splx(s);

        return 0;
}

int
atu_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
        struct atu_softc        *sc = ifp->if_softc;
        int                     err = 0, s;

        s = splnet();
        switch (command) {
        case SIOCSIFADDR:
                DPRINTFN(15, ("%s: SIOCSIFADDR\n", sc->atu_dev.dv_xname));

                ifp->if_flags |= IFF_UP;
                atu_init(ifp);
                break;

        case SIOCSIFFLAGS:
                DPRINTFN(15, ("%s: SIOCSIFFLAGS\n", sc->atu_dev.dv_xname));

                if (ifp->if_flags & IFF_UP) {
                        if (ifp->if_flags & IFF_RUNNING &&
                            ifp->if_flags & IFF_PROMISC &&
                            !(sc->atu_if_flags & IFF_PROMISC)) {
/* enable promisc */
#if 0
                                sc->atu_rxfilt |= ATU_RXFILT_PROMISC;
                                atu_setword(sc, ATU_CMD_SET_PKT_FILTER,
                                    sc->atu_rxfilt);
#endif
                        } else if (ifp->if_flags & IFF_RUNNING &&
                            !(ifp->if_flags & IFF_PROMISC) &&
                            sc->atu_if_flags & IFF_PROMISC) {
/* disable promisc */
#if 0
                                sc->atu_rxfilt &= ~ATU_RXFILT_PROMISC;
                                atu_setword(sc, ATU_CMD_SET_PKT_FILTER,
                                    sc->atu_rxfilt);
#endif
                        } else if (!(ifp->if_flags & IFF_RUNNING))
                                atu_init(ifp);

                        DPRINTFN(15, ("%s: ioctl calling atu_init()\n",
                            sc->atu_dev.dv_xname));
                        atu_init(ifp);
                        err = atu_switch_radio(sc, 1);
                } else {
                        if (ifp->if_flags & IFF_RUNNING)
                                atu_stop(ifp, 0);
                        err = atu_switch_radio(sc, 0);
                }
                sc->atu_if_flags = ifp->if_flags;
                err = 0;
                break;

        case SIOCADDMULTI:
                DPRINTFN(15, ("%s: SIOCADDMULTI\n", sc->atu_dev.dv_xname));
                /* TODO: implement */
                err = 0;
                break;

        case SIOCDELMULTI:
                DPRINTFN(15, ("%s: SIOCDELMULTI\n", sc->atu_dev.dv_xname));
                /* TODO: implement */
                err = 0;
                break;

        default:
                DPRINTFN(15, ("%s: ieee80211_ioctl (%lu)\n",
                    sc->atu_dev.dv_xname, command));
                err = ieee80211_ioctl(ifp, command, data);
                break;
        }

        if (err == ENETRESET) {
                if ((ifp->if_flags & (IFF_RUNNING|IFF_UP)) ==
                    (IFF_RUNNING|IFF_UP)) {
                        DPRINTF(("%s: atu_ioctl(): netreset\n",
                            sc->atu_dev.dv_xname));
                        atu_init(ifp);
                }
                err = 0;
        }

        splx(s);
        return (err);
}

void
atu_watchdog(struct ifnet *ifp)
{
        struct atu_softc        *sc = ifp->if_softc;
        struct atu_chain        *c;
        usbd_status             stat;
        int                     cnt, s;

        DPRINTF(("%s: atu_watchdog\n", sc->atu_dev.dv_xname));

        ifp->if_timer = 0;

        if ((ifp->if_flags & (IFF_RUNNING|IFF_UP)) != (IFF_RUNNING|IFF_UP))
                return;

        if (usbd_is_dying(sc->atu_udev))
                return;

        sc = ifp->if_softc;
        s = splnet();
        ifp->if_oerrors++;
        DPRINTF(("%s: watchdog timeout\n", sc->atu_dev.dv_xname));

        /*
         * TODO:
         * we should change this since we have multiple TX transfers...
         */
        for (cnt = 0; cnt < ATU_TX_LIST_CNT; cnt++) {
                c = &sc->atu_cdata.atu_tx_chain[cnt];
                if (c->atu_in_xfer) {
                        usbd_get_xfer_status(c->atu_xfer, NULL, NULL, NULL,
                            &stat);
                        atu_txeof(c->atu_xfer, c, stat);
                }
        }

        if (!ifq_empty(&ifp->if_snd))
                atu_start(ifp);
        splx(s);

        ieee80211_watchdog(ifp);
}

/*
 * Stop the adapter and free any mbufs allocated to the
 * RX and TX lists.
 */
void
atu_stop(struct ifnet *ifp, int disable)
{
        struct atu_softc        *sc = ifp->if_softc;
        struct atu_cdata        *cd;
        usbd_status             err;
        int s;

        s = splnet();
        ifp->if_flags &= ~IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);
        ifp->if_timer = 0;

        /* Stop transfers. */
        if (sc->atu_ep[ATU_ENDPT_RX] != NULL) {
                err = usbd_close_pipe(sc->atu_ep[ATU_ENDPT_RX]);
                if (err) {
                        DPRINTF(("%s: close rx pipe failed: %s\n",
                            sc->atu_dev.dv_xname, usbd_errstr(err)));
                }
                sc->atu_ep[ATU_ENDPT_RX] = NULL;
        }

        if (sc->atu_ep[ATU_ENDPT_TX] != NULL) {
                err = usbd_close_pipe(sc->atu_ep[ATU_ENDPT_TX]);
                if (err) {
                        DPRINTF(("%s: close tx pipe failed: %s\n",
                            sc->atu_dev.dv_xname, usbd_errstr(err)));
                }
                sc->atu_ep[ATU_ENDPT_TX] = NULL;
        }

        /* Free RX/TX/MGMT list resources. */
        cd = &sc->atu_cdata;
        atu_xfer_list_free(sc, cd->atu_rx_chain, ATU_RX_LIST_CNT);
        atu_xfer_list_free(sc, cd->atu_tx_chain, ATU_TX_LIST_CNT);

        /* Let's be nice and turn off the radio before we leave */
        atu_switch_radio(sc, 0);

        splx(s);
}