Merge tag 'v3.3.7' into 3.3/master

[zen-stable.git] / drivers / staging / wlan-ng / hfa384x_usb.c

/* src/prism2/driver/hfa384x_usb.c
*
* Functions that talk to the USB variantof the Intersil hfa384x MAC
*
* Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
* --------------------------------------------------------------------
*
* linux-wlan
*
*   The contents of this file are subject to the Mozilla Public
*   License Version 1.1 (the "License"); you may not use this file
*   except in compliance with the License. You may obtain a copy of
*   the License at http://www.mozilla.org/MPL/
*
*   Software distributed under the License is distributed on an "AS
*   IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
*   implied. See the License for the specific language governing
*   rights and limitations under the License.
*
*   Alternatively, the contents of this file may be used under the
*   terms of the GNU Public License version 2 (the "GPL"), in which
*   case the provisions of the GPL are applicable instead of the
*   above.  If you wish to allow the use of your version of this file
*   only under the terms of the GPL and not to allow others to use
*   your version of this file under the MPL, indicate your decision
*   by deleting the provisions above and replace them with the notice
*   and other provisions required by the GPL.  If you do not delete
*   the provisions above, a recipient may use your version of this
*   file under either the MPL or the GPL.
*
* --------------------------------------------------------------------
*
* Inquiries regarding the linux-wlan Open Source project can be
* made directly to:
*
* AbsoluteValue Systems Inc.
* info@linux-wlan.com
* http://www.linux-wlan.com
*
* --------------------------------------------------------------------
*
* Portions of the development of this software were funded by
* Intersil Corporation as part of PRISM(R) chipset product development.
*
* --------------------------------------------------------------------
*
* This file implements functions that correspond to the prism2/hfa384x
* 802.11 MAC hardware and firmware host interface.
*
* The functions can be considered to represent several levels of
* abstraction.  The lowest level functions are simply C-callable wrappers
* around the register accesses.  The next higher level represents C-callable
* prism2 API functions that match the Intersil documentation as closely
* as is reasonable.  The next higher layer implements common sequences
* of invocations of the API layer (e.g. write to bap, followed by cmd).
*
* Common sequences:
* hfa384x_drvr_xxx      Highest level abstractions provided by the
*                       hfa384x code.  They are driver defined wrappers
*                       for common sequences.  These functions generally
*                       use the services of the lower levels.
*
* hfa384x_drvr_xxxconfig  An example of the drvr level abstraction. These
*                       functions are wrappers for the RID get/set
*                       sequence. They call copy_[to|from]_bap() and
*                       cmd_access(). These functions operate on the
*                       RIDs and buffers without validation. The caller
*                       is responsible for that.
*
* API wrapper functions:
* hfa384x_cmd_xxx       functions that provide access to the f/w commands.
*                       The function arguments correspond to each command
*                       argument, even command arguments that get packed
*                       into single registers.  These functions _just_
*                       issue the command by setting the cmd/parm regs
*                       & reading the status/resp regs.  Additional
*                       activities required to fully use a command
*                       (read/write from/to bap, get/set int status etc.)
*                       are implemented separately.  Think of these as
*                       C-callable prism2 commands.
*
* Lowest Layer Functions:
* hfa384x_docmd_xxx     These functions implement the sequence required
*                       to issue any prism2 command.  Primarily used by the
*                       hfa384x_cmd_xxx functions.
*
* hfa384x_bap_xxx       BAP read/write access functions.
*                       Note: we usually use BAP0 for non-interrupt context
*                        and BAP1 for interrupt context.
*
* hfa384x_dl_xxx        download related functions.
*
* Driver State Issues:
* Note that there are two pairs of functions that manage the
* 'initialized' and 'running' states of the hw/MAC combo.  The four
* functions are create(), destroy(), start(), and stop().  create()
* sets up the data structures required to support the hfa384x_*
* functions and destroy() cleans them up.  The start() function gets
* the actual hardware running and enables the interrupts.  The stop()
* function shuts the hardware down.  The sequence should be:
* create()
* start()
*  .
*  .  Do interesting things w/ the hardware
*  .
* stop()
* destroy()
*
* Note that destroy() can be called without calling stop() first.
* --------------------------------------------------------------------
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/wireless.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <asm/byteorder.h>
#include <linux/bitops.h>
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/byteorder/generic.h>

#define SUBMIT_URB(u, f)  usb_submit_urb(u, f)

#include "p80211types.h"
#include "p80211hdr.h"
#include "p80211mgmt.h"
#include "p80211conv.h"
#include "p80211msg.h"
#include "p80211netdev.h"
#include "p80211req.h"
#include "p80211metadef.h"
#include "p80211metastruct.h"
#include "hfa384x.h"
#include "prism2mgmt.h"

enum cmd_mode {
        DOWAIT = 0,
        DOASYNC
};

#define THROTTLE_JIFFIES        (HZ/8)
#define URB_ASYNC_UNLINK 0
#define USB_QUEUE_BULK 0

#define ROUNDUP64(a) (((a)+63)&~63)

#ifdef DEBUG_USB
static void dbprint_urb(struct urb *urb);
#endif

static void
hfa384x_int_rxmonitor(wlandevice_t *wlandev, hfa384x_usb_rxfrm_t *rxfrm);

static void hfa384x_usb_defer(struct work_struct *data);

static int submit_rx_urb(hfa384x_t *hw, gfp_t flags);

static int submit_tx_urb(hfa384x_t *hw, struct urb *tx_urb, gfp_t flags);

/*---------------------------------------------------*/
/* Callbacks */
static void hfa384x_usbout_callback(struct urb *urb);
static void hfa384x_ctlxout_callback(struct urb *urb);
static void hfa384x_usbin_callback(struct urb *urb);

static void
hfa384x_usbin_txcompl(wlandevice_t *wlandev, hfa384x_usbin_t * usbin);

static void hfa384x_usbin_rx(wlandevice_t *wlandev, struct sk_buff *skb);

static void hfa384x_usbin_info(wlandevice_t *wlandev, hfa384x_usbin_t * usbin);

static void
hfa384x_usbout_tx(wlandevice_t *wlandev, hfa384x_usbout_t *usbout);

static void hfa384x_usbin_ctlx(hfa384x_t *hw, hfa384x_usbin_t *usbin,
                               int urb_status);

/*---------------------------------------------------*/
/* Functions to support the prism2 usb command queue */

static void hfa384x_usbctlxq_run(hfa384x_t *hw);

static void hfa384x_usbctlx_reqtimerfn(unsigned long data);

static void hfa384x_usbctlx_resptimerfn(unsigned long data);

static void hfa384x_usb_throttlefn(unsigned long data);

static void hfa384x_usbctlx_completion_task(unsigned long data);

static void hfa384x_usbctlx_reaper_task(unsigned long data);

static int hfa384x_usbctlx_submit(hfa384x_t *hw, hfa384x_usbctlx_t *ctlx);

static void unlocked_usbctlx_complete(hfa384x_t *hw, hfa384x_usbctlx_t *ctlx);

struct usbctlx_completor {
        int (*complete) (struct usbctlx_completor *);
};

static int
hfa384x_usbctlx_complete_sync(hfa384x_t *hw,
                              hfa384x_usbctlx_t *ctlx,
                              struct usbctlx_completor *completor);

static int
unlocked_usbctlx_cancel_async(hfa384x_t *hw, hfa384x_usbctlx_t *ctlx);

static void hfa384x_cb_status(hfa384x_t *hw, const hfa384x_usbctlx_t *ctlx);

static void hfa384x_cb_rrid(hfa384x_t *hw, const hfa384x_usbctlx_t *ctlx);

static int
usbctlx_get_status(const hfa384x_usb_cmdresp_t *cmdresp,
                   hfa384x_cmdresult_t *result);

static void
usbctlx_get_rridresult(const hfa384x_usb_rridresp_t *rridresp,
                       hfa384x_rridresult_t *result);

/*---------------------------------------------------*/
/* Low level req/resp CTLX formatters and submitters */
static int
hfa384x_docmd(hfa384x_t *hw,
              enum cmd_mode mode,
              hfa384x_metacmd_t *cmd,
              ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data);

static int
hfa384x_dorrid(hfa384x_t *hw,
               enum cmd_mode mode,
               u16 rid,
               void *riddata,
               unsigned int riddatalen,
               ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data);

static int
hfa384x_dowrid(hfa384x_t *hw,
               enum cmd_mode mode,
               u16 rid,
               void *riddata,
               unsigned int riddatalen,
               ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data);

static int
hfa384x_dormem(hfa384x_t *hw,
               enum cmd_mode mode,
               u16 page,
               u16 offset,
               void *data,
               unsigned int len,
               ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data);

static int
hfa384x_dowmem(hfa384x_t *hw,
               enum cmd_mode mode,
               u16 page,
               u16 offset,
               void *data,
               unsigned int len,
               ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data);

static int hfa384x_isgood_pdrcode(u16 pdrcode);

static inline const char *ctlxstr(CTLX_STATE s)
{
        static const char *ctlx_str[] = {
                "Initial state",
                "Complete",
                "Request failed",
                "Request pending",
                "Request packet submitted",
                "Request packet completed",
                "Response packet completed"
        };

        return ctlx_str[s];
};

static inline hfa384x_usbctlx_t *get_active_ctlx(hfa384x_t * hw)
{
        return list_entry(hw->ctlxq.active.next, hfa384x_usbctlx_t, list);
}

#ifdef DEBUG_USB
void dbprint_urb(struct urb *urb)
{
        pr_debug("urb->pipe=0x%08x\n", urb->pipe);
        pr_debug("urb->status=0x%08x\n", urb->status);
        pr_debug("urb->transfer_flags=0x%08x\n", urb->transfer_flags);
        pr_debug("urb->transfer_buffer=0x%08x\n",
                 (unsigned int)urb->transfer_buffer);
        pr_debug("urb->transfer_buffer_length=0x%08x\n",
                 urb->transfer_buffer_length);
        pr_debug("urb->actual_length=0x%08x\n", urb->actual_length);
        pr_debug("urb->bandwidth=0x%08x\n", urb->bandwidth);
        pr_debug("urb->setup_packet(ctl)=0x%08x\n",
                 (unsigned int)urb->setup_packet);
        pr_debug("urb->start_frame(iso/irq)=0x%08x\n", urb->start_frame);
        pr_debug("urb->interval(irq)=0x%08x\n", urb->interval);
        pr_debug("urb->error_count(iso)=0x%08x\n", urb->error_count);
        pr_debug("urb->timeout=0x%08x\n", urb->timeout);
        pr_debug("urb->context=0x%08x\n", (unsigned int)urb->context);
        pr_debug("urb->complete=0x%08x\n", (unsigned int)urb->complete);
}
#endif

/*----------------------------------------------------------------
* submit_rx_urb
*
* Listen for input data on the BULK-IN pipe. If the pipe has
* stalled then schedule it to be reset.
*
* Arguments:
*       hw              device struct
*       memflags        memory allocation flags
*
* Returns:
*       error code from submission
*
* Call context:
*       Any
----------------------------------------------------------------*/
static int submit_rx_urb(hfa384x_t *hw, gfp_t memflags)
{
        struct sk_buff *skb;
        int result;

        skb = dev_alloc_skb(sizeof(hfa384x_usbin_t));
        if (skb == NULL) {
                result = -ENOMEM;
                goto done;
        }

        /* Post the IN urb */
        usb_fill_bulk_urb(&hw->rx_urb, hw->usb,
                          hw->endp_in,
                          skb->data, sizeof(hfa384x_usbin_t),
                          hfa384x_usbin_callback, hw->wlandev);

        hw->rx_urb_skb = skb;

        result = -ENOLINK;
        if (!hw->wlandev->hwremoved &&
                        !test_bit(WORK_RX_HALT, &hw->usb_flags)) {
                result = SUBMIT_URB(&hw->rx_urb, memflags);

                /* Check whether we need to reset the RX pipe */
                if (result == -EPIPE) {
                        printk(KERN_WARNING
                               "%s rx pipe stalled: requesting reset\n",
                               hw->wlandev->netdev->name);
                        if (!test_and_set_bit(WORK_RX_HALT, &hw->usb_flags))
                                schedule_work(&hw->usb_work);
                }
        }

        /* Don't leak memory if anything should go wrong */
        if (result != 0) {
                dev_kfree_skb(skb);
                hw->rx_urb_skb = NULL;
        }

done:
        return result;
}

/*----------------------------------------------------------------
* submit_tx_urb
*
* Prepares and submits the URB of transmitted data. If the
* submission fails then it will schedule the output pipe to
* be reset.
*
* Arguments:
*       hw              device struct
*       tx_urb          URB of data for tranmission
*       memflags        memory allocation flags
*
* Returns:
*       error code from submission
*
* Call context:
*       Any
----------------------------------------------------------------*/
static int submit_tx_urb(hfa384x_t *hw, struct urb *tx_urb, gfp_t memflags)
{
        struct net_device *netdev = hw->wlandev->netdev;
        int result;

        result = -ENOLINK;
        if (netif_running(netdev)) {

                if (!hw->wlandev->hwremoved
                    && !test_bit(WORK_TX_HALT, &hw->usb_flags)) {
                        result = SUBMIT_URB(tx_urb, memflags);

                        /* Test whether we need to reset the TX pipe */
                        if (result == -EPIPE) {
                                printk(KERN_WARNING
                                       "%s tx pipe stalled: requesting reset\n",
                                       netdev->name);
                                set_bit(WORK_TX_HALT, &hw->usb_flags);
                                schedule_work(&hw->usb_work);
                        } else if (result == 0) {
                                netif_stop_queue(netdev);
                        }
                }
        }

        return result;
}

/*----------------------------------------------------------------
* hfa394x_usb_defer
*
* There are some things that the USB stack cannot do while
* in interrupt context, so we arrange this function to run
* in process context.
*
* Arguments:
*       hw      device structure
*
* Returns:
*       nothing
*
* Call context:
*       process (by design)
----------------------------------------------------------------*/
static void hfa384x_usb_defer(struct work_struct *data)
{
        hfa384x_t *hw = container_of(data, struct hfa384x, usb_work);
        struct net_device *netdev = hw->wlandev->netdev;

        /* Don't bother trying to reset anything if the plug
         * has been pulled ...
         */
        if (hw->wlandev->hwremoved)
                return;

        /* Reception has stopped: try to reset the input pipe */
        if (test_bit(WORK_RX_HALT, &hw->usb_flags)) {
                int ret;

                usb_kill_urb(&hw->rx_urb); /* Cannot be holding spinlock! */

                ret = usb_clear_halt(hw->usb, hw->endp_in);
                if (ret != 0) {
                        printk(KERN_ERR
                               "Failed to clear rx pipe for %s: err=%d\n",
                               netdev->name, ret);
                } else {
                        printk(KERN_INFO "%s rx pipe reset complete.\n",
                               netdev->name);
                        clear_bit(WORK_RX_HALT, &hw->usb_flags);
                        set_bit(WORK_RX_RESUME, &hw->usb_flags);
                }
        }

        /* Resume receiving data back from the device. */
        if (test_bit(WORK_RX_RESUME, &hw->usb_flags)) {
                int ret;

                ret = submit_rx_urb(hw, GFP_KERNEL);
                if (ret != 0) {
                        printk(KERN_ERR
                               "Failed to resume %s rx pipe.\n", netdev->name);
                } else {
                        clear_bit(WORK_RX_RESUME, &hw->usb_flags);
                }
        }

        /* Transmission has stopped: try to reset the output pipe */
        if (test_bit(WORK_TX_HALT, &hw->usb_flags)) {
                int ret;

                usb_kill_urb(&hw->tx_urb);
                ret = usb_clear_halt(hw->usb, hw->endp_out);
                if (ret != 0) {
                        printk(KERN_ERR
                               "Failed to clear tx pipe for %s: err=%d\n",
                               netdev->name, ret);
                } else {
                        printk(KERN_INFO "%s tx pipe reset complete.\n",
                               netdev->name);
                        clear_bit(WORK_TX_HALT, &hw->usb_flags);
                        set_bit(WORK_TX_RESUME, &hw->usb_flags);

                        /* Stopping the BULK-OUT pipe also blocked
                         * us from sending any more CTLX URBs, so
                         * we need to re-run our queue ...
                         */
                        hfa384x_usbctlxq_run(hw);
                }
        }

        /* Resume transmitting. */
        if (test_and_clear_bit(WORK_TX_RESUME, &hw->usb_flags))
                netif_wake_queue(hw->wlandev->netdev);
}

/*----------------------------------------------------------------
* hfa384x_create
*
* Sets up the hfa384x_t data structure for use.  Note this
* does _not_ initialize the actual hardware, just the data structures
* we use to keep track of its state.
*
* Arguments:
*       hw              device structure
*       irq             device irq number
*       iobase          i/o base address for register access
*       membase         memory base address for register access
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
void hfa384x_create(hfa384x_t *hw, struct usb_device *usb)
{
        memset(hw, 0, sizeof(hfa384x_t));
        hw->usb = usb;

        /* set up the endpoints */
        hw->endp_in = usb_rcvbulkpipe(usb, 1);
        hw->endp_out = usb_sndbulkpipe(usb, 2);

        /* Set up the waitq */
        init_waitqueue_head(&hw->cmdq);

        /* Initialize the command queue */
        spin_lock_init(&hw->ctlxq.lock);
        INIT_LIST_HEAD(&hw->ctlxq.pending);
        INIT_LIST_HEAD(&hw->ctlxq.active);
        INIT_LIST_HEAD(&hw->ctlxq.completing);
        INIT_LIST_HEAD(&hw->ctlxq.reapable);

        /* Initialize the authentication queue */
        skb_queue_head_init(&hw->authq);

        tasklet_init(&hw->reaper_bh,
                     hfa384x_usbctlx_reaper_task, (unsigned long)hw);
        tasklet_init(&hw->completion_bh,
                     hfa384x_usbctlx_completion_task, (unsigned long)hw);
        INIT_WORK(&hw->link_bh, prism2sta_processing_defer);
        INIT_WORK(&hw->usb_work, hfa384x_usb_defer);

        init_timer(&hw->throttle);
        hw->throttle.function = hfa384x_usb_throttlefn;
        hw->throttle.data = (unsigned long)hw;

        init_timer(&hw->resptimer);
        hw->resptimer.function = hfa384x_usbctlx_resptimerfn;
        hw->resptimer.data = (unsigned long)hw;

        init_timer(&hw->reqtimer);
        hw->reqtimer.function = hfa384x_usbctlx_reqtimerfn;
        hw->reqtimer.data = (unsigned long)hw;

        usb_init_urb(&hw->rx_urb);
        usb_init_urb(&hw->tx_urb);
        usb_init_urb(&hw->ctlx_urb);

        hw->link_status = HFA384x_LINK_NOTCONNECTED;
        hw->state = HFA384x_STATE_INIT;

        INIT_WORK(&hw->commsqual_bh, prism2sta_commsqual_defer);
        init_timer(&hw->commsqual_timer);
        hw->commsqual_timer.data = (unsigned long)hw;
        hw->commsqual_timer.function = prism2sta_commsqual_timer;
}

/*----------------------------------------------------------------
* hfa384x_destroy
*
* Partner to hfa384x_create().  This function cleans up the hw
* structure so that it can be freed by the caller using a simple
* kfree.  Currently, this function is just a placeholder.  If, at some
* point in the future, an hw in the 'shutdown' state requires a 'deep'
* kfree, this is where it should be done.  Note that if this function
* is called on a _running_ hw structure, the drvr_stop() function is
* called.
*
* Arguments:
*       hw              device structure
*
* Returns:
*       nothing, this function is not allowed to fail.
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
void hfa384x_destroy(hfa384x_t *hw)
{
        struct sk_buff *skb;

        if (hw->state == HFA384x_STATE_RUNNING)
                hfa384x_drvr_stop(hw);
        hw->state = HFA384x_STATE_PREINIT;

        kfree(hw->scanresults);
        hw->scanresults = NULL;

        /* Now to clean out the auth queue */
        while ((skb = skb_dequeue(&hw->authq)))
                dev_kfree_skb(skb);
}

static hfa384x_usbctlx_t *usbctlx_alloc(void)
{
        hfa384x_usbctlx_t *ctlx;

        ctlx = kmalloc(sizeof(*ctlx), in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
        if (ctlx != NULL) {
                memset(ctlx, 0, sizeof(*ctlx));
                init_completion(&ctlx->done);
        }

        return ctlx;
}

static int
usbctlx_get_status(const hfa384x_usb_cmdresp_t *cmdresp,
                   hfa384x_cmdresult_t *result)
{
        result->status = le16_to_cpu(cmdresp->status);
        result->resp0 = le16_to_cpu(cmdresp->resp0);
        result->resp1 = le16_to_cpu(cmdresp->resp1);
        result->resp2 = le16_to_cpu(cmdresp->resp2);

        pr_debug("cmdresult:status=0x%04x "
                 "resp0=0x%04x resp1=0x%04x resp2=0x%04x\n",
                 result->status, result->resp0, result->resp1, result->resp2);

        return result->status & HFA384x_STATUS_RESULT;
}

static void
usbctlx_get_rridresult(const hfa384x_usb_rridresp_t *rridresp,
                       hfa384x_rridresult_t *result)
{
        result->rid = le16_to_cpu(rridresp->rid);
        result->riddata = rridresp->data;
        result->riddata_len = ((le16_to_cpu(rridresp->frmlen) - 1) * 2);

}

/*----------------------------------------------------------------
* Completor object:
* This completor must be passed to hfa384x_usbctlx_complete_sync()
* when processing a CTLX that returns a hfa384x_cmdresult_t structure.
----------------------------------------------------------------*/
struct usbctlx_cmd_completor {
        struct usbctlx_completor head;

        const hfa384x_usb_cmdresp_t *cmdresp;
        hfa384x_cmdresult_t *result;
};

static inline int usbctlx_cmd_completor_fn(struct usbctlx_completor *head)
{
        struct usbctlx_cmd_completor *complete;

        complete = (struct usbctlx_cmd_completor *) head;
        return usbctlx_get_status(complete->cmdresp, complete->result);
}

static inline struct usbctlx_completor *init_cmd_completor(
                                                struct usbctlx_cmd_completor
                                                        *completor,
                                                const hfa384x_usb_cmdresp_t
                                                        *cmdresp,
                                                hfa384x_cmdresult_t *result)
{
        completor->head.complete = usbctlx_cmd_completor_fn;
        completor->cmdresp = cmdresp;
        completor->result = result;
        return &(completor->head);
}

/*----------------------------------------------------------------
* Completor object:
* This completor must be passed to hfa384x_usbctlx_complete_sync()
* when processing a CTLX that reads a RID.
----------------------------------------------------------------*/
struct usbctlx_rrid_completor {
        struct usbctlx_completor head;

        const hfa384x_usb_rridresp_t *rridresp;
        void *riddata;
        unsigned int riddatalen;
};

static int usbctlx_rrid_completor_fn(struct usbctlx_completor *head)
{
        struct usbctlx_rrid_completor *complete;
        hfa384x_rridresult_t rridresult;

        complete = (struct usbctlx_rrid_completor *) head;
        usbctlx_get_rridresult(complete->rridresp, &rridresult);

        /* Validate the length, note body len calculation in bytes */
        if (rridresult.riddata_len != complete->riddatalen) {
                printk(KERN_WARNING
                       "RID len mismatch, rid=0x%04x hlen=%d fwlen=%d\n",
                       rridresult.rid,
                       complete->riddatalen, rridresult.riddata_len);
                return -ENODATA;
        }

        memcpy(complete->riddata, rridresult.riddata, complete->riddatalen);
        return 0;
}

static inline struct usbctlx_completor *init_rrid_completor(
                                                struct usbctlx_rrid_completor
                                                        *completor,
                                                const hfa384x_usb_rridresp_t
                                                        *rridresp,
                                                void *riddata,
                                                unsigned int riddatalen)
{
        completor->head.complete = usbctlx_rrid_completor_fn;
        completor->rridresp = rridresp;
        completor->riddata = riddata;
        completor->riddatalen = riddatalen;
        return &(completor->head);
}

/*----------------------------------------------------------------
* Completor object:
* Interprets the results of a synchronous RID-write
----------------------------------------------------------------*/
typedef struct usbctlx_cmd_completor usbctlx_wrid_completor_t;
#define init_wrid_completor  init_cmd_completor

/*----------------------------------------------------------------
* Completor object:
* Interprets the results of a synchronous memory-write
----------------------------------------------------------------*/
typedef struct usbctlx_cmd_completor usbctlx_wmem_completor_t;
#define init_wmem_completor  init_cmd_completor

/*----------------------------------------------------------------
* Completor object:
* Interprets the results of a synchronous memory-read
----------------------------------------------------------------*/
struct usbctlx_rmem_completor {
        struct usbctlx_completor head;

        const hfa384x_usb_rmemresp_t *rmemresp;
        void *data;
        unsigned int len;
};
typedef struct usbctlx_rmem_completor usbctlx_rmem_completor_t;

static int usbctlx_rmem_completor_fn(struct usbctlx_completor *head)
{
        usbctlx_rmem_completor_t *complete = (usbctlx_rmem_completor_t *) head;

        pr_debug("rmemresp:len=%d\n", complete->rmemresp->frmlen);
        memcpy(complete->data, complete->rmemresp->data, complete->len);
        return 0;
}

static inline struct usbctlx_completor *init_rmem_completor(
                                                usbctlx_rmem_completor_t
                                                        *completor,
                                                hfa384x_usb_rmemresp_t
                                                        *rmemresp,
                                                void *data,
                                                unsigned int len)
{
        completor->head.complete = usbctlx_rmem_completor_fn;
        completor->rmemresp = rmemresp;
        completor->data = data;
        completor->len = len;
        return &(completor->head);
}

/*----------------------------------------------------------------
* hfa384x_cb_status
*
* Ctlx_complete handler for async CMD type control exchanges.
* mark the hw struct as such.
*
* Note: If the handling is changed here, it should probably be
*       changed in docmd as well.
*
* Arguments:
*       hw              hw struct
*       ctlx            completed CTLX
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_cb_status(hfa384x_t *hw, const hfa384x_usbctlx_t *ctlx)
{
        if (ctlx->usercb != NULL) {
                hfa384x_cmdresult_t cmdresult;

                if (ctlx->state != CTLX_COMPLETE) {
                        memset(&cmdresult, 0, sizeof(cmdresult));
                        cmdresult.status =
                            HFA384x_STATUS_RESULT_SET(HFA384x_CMD_ERR);
                } else {
                        usbctlx_get_status(&ctlx->inbuf.cmdresp, &cmdresult);
                }

                ctlx->usercb(hw, &cmdresult, ctlx->usercb_data);
        }
}

/*----------------------------------------------------------------
* hfa384x_cb_rrid
*
* CTLX completion handler for async RRID type control exchanges.
*
* Note: If the handling is changed here, it should probably be
*       changed in dorrid as well.
*
* Arguments:
*       hw              hw struct
*       ctlx            completed CTLX
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_cb_rrid(hfa384x_t *hw, const hfa384x_usbctlx_t *ctlx)
{
        if (ctlx->usercb != NULL) {
                hfa384x_rridresult_t rridresult;

                if (ctlx->state != CTLX_COMPLETE) {
                        memset(&rridresult, 0, sizeof(rridresult));
                        rridresult.rid = le16_to_cpu(ctlx->outbuf.rridreq.rid);
                } else {
                        usbctlx_get_rridresult(&ctlx->inbuf.rridresp,
                                               &rridresult);
                }

                ctlx->usercb(hw, &rridresult, ctlx->usercb_data);
        }
}

static inline int hfa384x_docmd_wait(hfa384x_t *hw, hfa384x_metacmd_t *cmd)
{
        return hfa384x_docmd(hw, DOWAIT, cmd, NULL, NULL, NULL);
}

static inline int
hfa384x_docmd_async(hfa384x_t *hw,
                    hfa384x_metacmd_t *cmd,
                    ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data)
{
        return hfa384x_docmd(hw, DOASYNC, cmd, cmdcb, usercb, usercb_data);
}

static inline int
hfa384x_dorrid_wait(hfa384x_t *hw, u16 rid, void *riddata,
                    unsigned int riddatalen)
{
        return hfa384x_dorrid(hw, DOWAIT,
                              rid, riddata, riddatalen, NULL, NULL, NULL);
}

static inline int
hfa384x_dorrid_async(hfa384x_t *hw,
                     u16 rid, void *riddata, unsigned int riddatalen,
                     ctlx_cmdcb_t cmdcb,
                     ctlx_usercb_t usercb, void *usercb_data)
{
        return hfa384x_dorrid(hw, DOASYNC,
                              rid, riddata, riddatalen,
                              cmdcb, usercb, usercb_data);
}

static inline int
hfa384x_dowrid_wait(hfa384x_t *hw, u16 rid, void *riddata,
                    unsigned int riddatalen)
{
        return hfa384x_dowrid(hw, DOWAIT,
                              rid, riddata, riddatalen, NULL, NULL, NULL);
}

static inline int
hfa384x_dowrid_async(hfa384x_t *hw,
                     u16 rid, void *riddata, unsigned int riddatalen,
                     ctlx_cmdcb_t cmdcb,
                     ctlx_usercb_t usercb, void *usercb_data)
{
        return hfa384x_dowrid(hw, DOASYNC,
                              rid, riddata, riddatalen,
                              cmdcb, usercb, usercb_data);
}

static inline int
hfa384x_dormem_wait(hfa384x_t *hw,
                    u16 page, u16 offset, void *data, unsigned int len)
{
        return hfa384x_dormem(hw, DOWAIT,
                              page, offset, data, len, NULL, NULL, NULL);
}

static inline int
hfa384x_dormem_async(hfa384x_t *hw,
                     u16 page, u16 offset, void *data, unsigned int len,
                     ctlx_cmdcb_t cmdcb,
                     ctlx_usercb_t usercb, void *usercb_data)
{
        return hfa384x_dormem(hw, DOASYNC,
                              page, offset, data, len,
                              cmdcb, usercb, usercb_data);
}

static inline int
hfa384x_dowmem_wait(hfa384x_t *hw,
                    u16 page, u16 offset, void *data, unsigned int len)
{
        return hfa384x_dowmem(hw, DOWAIT,
                              page, offset, data, len, NULL, NULL, NULL);
}

static inline int
hfa384x_dowmem_async(hfa384x_t *hw,
                     u16 page,
                     u16 offset,
                     void *data,
                     unsigned int len,
                     ctlx_cmdcb_t cmdcb,
                     ctlx_usercb_t usercb, void *usercb_data)
{
        return hfa384x_dowmem(hw, DOASYNC,
                              page, offset, data, len,
                              cmdcb, usercb, usercb_data);
}

/*----------------------------------------------------------------
* hfa384x_cmd_initialize
*
* Issues the initialize command and sets the hw->state based
* on the result.
*
* Arguments:
*       hw              device structure
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_cmd_initialize(hfa384x_t *hw)
{
        int result = 0;
        int i;
        hfa384x_metacmd_t cmd;

        cmd.cmd = HFA384x_CMDCODE_INIT;
        cmd.parm0 = 0;
        cmd.parm1 = 0;
        cmd.parm2 = 0;

        result = hfa384x_docmd_wait(hw, &cmd);

        pr_debug("cmdresp.init: "
                 "status=0x%04x, resp0=0x%04x, "
                 "resp1=0x%04x, resp2=0x%04x\n",
                 cmd.result.status,
                 cmd.result.resp0, cmd.result.resp1, cmd.result.resp2);
        if (result == 0) {
                for (i = 0; i < HFA384x_NUMPORTS_MAX; i++)
                        hw->port_enabled[i] = 0;
        }

        hw->link_status = HFA384x_LINK_NOTCONNECTED;

        return result;
}

/*----------------------------------------------------------------
* hfa384x_cmd_disable
*
* Issues the disable command to stop communications on one of
* the MACs 'ports'.
*
* Arguments:
*       hw              device structure
*       macport         MAC port number (host order)
*
* Returns:
*       0               success
*       >0              f/w reported failure - f/w status code
*       <0              driver reported error (timeout|bad arg)
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_cmd_disable(hfa384x_t *hw, u16 macport)
{
        int result = 0;
        hfa384x_metacmd_t cmd;

        cmd.cmd = HFA384x_CMD_CMDCODE_SET(HFA384x_CMDCODE_DISABLE) |
            HFA384x_CMD_MACPORT_SET(macport);
        cmd.parm0 = 0;
        cmd.parm1 = 0;
        cmd.parm2 = 0;

        result = hfa384x_docmd_wait(hw, &cmd);

        return result;
}

/*----------------------------------------------------------------
* hfa384x_cmd_enable
*
* Issues the enable command to enable communications on one of
* the MACs 'ports'.
*
* Arguments:
*       hw              device structure
*       macport         MAC port number
*
* Returns:
*       0               success
*       >0              f/w reported failure - f/w status code
*       <0              driver reported error (timeout|bad arg)
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_cmd_enable(hfa384x_t *hw, u16 macport)
{
        int result = 0;
        hfa384x_metacmd_t cmd;

        cmd.cmd = HFA384x_CMD_CMDCODE_SET(HFA384x_CMDCODE_ENABLE) |
            HFA384x_CMD_MACPORT_SET(macport);
        cmd.parm0 = 0;
        cmd.parm1 = 0;
        cmd.parm2 = 0;

        result = hfa384x_docmd_wait(hw, &cmd);

        return result;
}

/*----------------------------------------------------------------
* hfa384x_cmd_monitor
*
* Enables the 'monitor mode' of the MAC.  Here's the description of
* monitor mode that I've received thus far:
*
*  "The "monitor mode" of operation is that the MAC passes all
*  frames for which the PLCP checks are correct. All received
*  MPDUs are passed to the host with MAC Port = 7, with a
*  receive status of good, FCS error, or undecryptable. Passing
*  certain MPDUs is a violation of the 802.11 standard, but useful
*  for a debugging tool."  Normal communication is not possible
*  while monitor mode is enabled.
*
* Arguments:
*       hw              device structure
*       enable          a code (0x0b|0x0f) that enables/disables
*                       monitor mode. (host order)
*
* Returns:
*       0               success
*       >0              f/w reported failure - f/w status code
*       <0              driver reported error (timeout|bad arg)
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_cmd_monitor(hfa384x_t *hw, u16 enable)
{
        int result = 0;
        hfa384x_metacmd_t cmd;

        cmd.cmd = HFA384x_CMD_CMDCODE_SET(HFA384x_CMDCODE_MONITOR) |
            HFA384x_CMD_AINFO_SET(enable);
        cmd.parm0 = 0;
        cmd.parm1 = 0;
        cmd.parm2 = 0;

        result = hfa384x_docmd_wait(hw, &cmd);

        return result;
}

/*----------------------------------------------------------------
* hfa384x_cmd_download
*
* Sets the controls for the MAC controller code/data download
* process.  The arguments set the mode and address associated
* with a download.  Note that the aux registers should be enabled
* prior to setting one of the download enable modes.
*
* Arguments:
*       hw              device structure
*       mode            0 - Disable programming and begin code exec
*                       1 - Enable volatile mem programming
*                       2 - Enable non-volatile mem programming
*                       3 - Program non-volatile section from NV download
*                           buffer.
*                       (host order)
*       lowaddr
*       highaddr        For mode 1, sets the high & low order bits of
*                       the "destination address".  This address will be
*                       the execution start address when download is
*                       subsequently disabled.
*                       For mode 2, sets the high & low order bits of
*                       the destination in NV ram.
*                       For modes 0 & 3, should be zero. (host order)
*                       NOTE: these are CMD format.
*       codelen         Length of the data to write in mode 2,
*                       zero otherwise. (host order)
*
* Returns:
*       0               success
*       >0              f/w reported failure - f/w status code
*       <0              driver reported error (timeout|bad arg)
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_cmd_download(hfa384x_t *hw, u16 mode, u16 lowaddr,
                         u16 highaddr, u16 codelen)
{
        int result = 0;
        hfa384x_metacmd_t cmd;

        pr_debug("mode=%d, lowaddr=0x%04x, highaddr=0x%04x, codelen=%d\n",
                 mode, lowaddr, highaddr, codelen);

        cmd.cmd = (HFA384x_CMD_CMDCODE_SET(HFA384x_CMDCODE_DOWNLD) |
                   HFA384x_CMD_PROGMODE_SET(mode));

        cmd.parm0 = lowaddr;
        cmd.parm1 = highaddr;
        cmd.parm2 = codelen;

        result = hfa384x_docmd_wait(hw, &cmd);

        return result;
}

/*----------------------------------------------------------------
* hfa384x_corereset
*
* Perform a reset of the hfa38xx MAC core.  We assume that the hw
* structure is in its "created" state.  That is, it is initialized
* with proper values.  Note that if a reset is done after the
* device has been active for awhile, the caller might have to clean
* up some leftover cruft in the hw structure.
*
* Arguments:
*       hw              device structure
*       holdtime        how long (in ms) to hold the reset
*       settletime      how long (in ms) to wait after releasing
*                       the reset
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_corereset(hfa384x_t *hw, int holdtime, int settletime, int genesis)
{
        int result = 0;

        result = usb_reset_device(hw->usb);
        if (result < 0) {
                printk(KERN_ERR "usb_reset_device() failed, result=%d.\n",
                       result);
        }

        return result;
}

/*----------------------------------------------------------------
* hfa384x_usbctlx_complete_sync
*
* Waits for a synchronous CTLX object to complete,
* and then handles the response.
*
* Arguments:
*       hw              device structure
*       ctlx            CTLX ptr
*       completor       functor object to decide what to
*                       do with the CTLX's result.
*
* Returns:
*       0               Success
*       -ERESTARTSYS    Interrupted by a signal
*       -EIO            CTLX failed
*       -ENODEV         Adapter was unplugged
*       ???             Result from completor
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
static int hfa384x_usbctlx_complete_sync(hfa384x_t *hw,
                                         hfa384x_usbctlx_t *ctlx,
                                         struct usbctlx_completor *completor)
{
        unsigned long flags;
        int result;

        result = wait_for_completion_interruptible(&ctlx->done);

        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        /*
         * We can only handle the CTLX if the USB disconnect
         * function has not run yet ...
         */
cleanup:
        if (hw->wlandev->hwremoved) {
                spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                result = -ENODEV;
        } else if (result != 0) {
                int runqueue = 0;

                /*
                 * We were probably interrupted, so delete
                 * this CTLX asynchronously, kill the timers
                 * and the URB, and then start the next
                 * pending CTLX.
                 *
                 * NOTE: We can only delete the timers and
                 *       the URB if this CTLX is active.
                 */
                if (ctlx == get_active_ctlx(hw)) {
                        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);

                        del_singleshot_timer_sync(&hw->reqtimer);
                        del_singleshot_timer_sync(&hw->resptimer);
                        hw->req_timer_done = 1;
                        hw->resp_timer_done = 1;
                        usb_kill_urb(&hw->ctlx_urb);

                        spin_lock_irqsave(&hw->ctlxq.lock, flags);

                        runqueue = 1;

                        /*
                         * This scenario is so unlikely that I'm
                         * happy with a grubby "goto" solution ...
                         */
                        if (hw->wlandev->hwremoved)
                                goto cleanup;
                }

                /*
                 * The completion task will send this CTLX
                 * to the reaper the next time it runs. We
                 * are no longer in a hurry.
                 */
                ctlx->reapable = 1;
                ctlx->state = CTLX_REQ_FAILED;
                list_move_tail(&ctlx->list, &hw->ctlxq.completing);

                spin_unlock_irqrestore(&hw->ctlxq.lock, flags);

                if (runqueue)
                        hfa384x_usbctlxq_run(hw);
        } else {
                if (ctlx->state == CTLX_COMPLETE) {
                        result = completor->complete(completor);
                } else {
                        printk(KERN_WARNING "CTLX[%d] error: state(%s)\n",
                               le16_to_cpu(ctlx->outbuf.type),
                               ctlxstr(ctlx->state));
                        result = -EIO;
                }

                list_del(&ctlx->list);
                spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                kfree(ctlx);
        }

        return result;
}

/*----------------------------------------------------------------
* hfa384x_docmd
*
* Constructs a command CTLX and submits it.
*
* NOTE: Any changes to the 'post-submit' code in this function
*       need to be carried over to hfa384x_cbcmd() since the handling
*       is virtually identical.
*
* Arguments:
*       hw              device structure
*       mode            DOWAIT or DOASYNC
*       cmd             cmd structure.  Includes all arguments and result
*                       data points.  All in host order. in host order
*       cmdcb           command-specific callback
*       usercb          user callback for async calls, NULL for DOWAIT calls
*       usercb_data     user supplied data pointer for async calls, NULL
*                       for DOASYNC calls
*
* Returns:
*       0               success
*       -EIO            CTLX failure
*       -ERESTARTSYS    Awakened on signal
*       >0              command indicated error, Status and Resp0-2 are
*                       in hw structure.
*
* Side effects:
*
*
* Call context:
*       process
----------------------------------------------------------------*/
static int
hfa384x_docmd(hfa384x_t *hw,
              enum cmd_mode mode,
              hfa384x_metacmd_t *cmd,
              ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data)
{
        int result;
        hfa384x_usbctlx_t *ctlx;

        ctlx = usbctlx_alloc();
        if (ctlx == NULL) {
                result = -ENOMEM;
                goto done;
        }

        /* Initialize the command */
        ctlx->outbuf.cmdreq.type = cpu_to_le16(HFA384x_USB_CMDREQ);
        ctlx->outbuf.cmdreq.cmd = cpu_to_le16(cmd->cmd);
        ctlx->outbuf.cmdreq.parm0 = cpu_to_le16(cmd->parm0);
        ctlx->outbuf.cmdreq.parm1 = cpu_to_le16(cmd->parm1);
        ctlx->outbuf.cmdreq.parm2 = cpu_to_le16(cmd->parm2);

        ctlx->outbufsize = sizeof(ctlx->outbuf.cmdreq);

        pr_debug("cmdreq: cmd=0x%04x "
                 "parm0=0x%04x parm1=0x%04x parm2=0x%04x\n",
                 cmd->cmd, cmd->parm0, cmd->parm1, cmd->parm2);

        ctlx->reapable = mode;
        ctlx->cmdcb = cmdcb;
        ctlx->usercb = usercb;
        ctlx->usercb_data = usercb_data;

        result = hfa384x_usbctlx_submit(hw, ctlx);
        if (result != 0) {
                kfree(ctlx);
        } else if (mode == DOWAIT) {
                struct usbctlx_cmd_completor completor;

                result =
                    hfa384x_usbctlx_complete_sync(hw, ctlx,
                                                  init_cmd_completor(&completor,
                                                                     &ctlx->
                                                                     inbuf.
                                                                     cmdresp,
                                                                     &cmd->
                                                                     result));
        }

done:
        return result;
}

/*----------------------------------------------------------------
* hfa384x_dorrid
*
* Constructs a read rid CTLX and issues it.
*
* NOTE: Any changes to the 'post-submit' code in this function
*       need to be carried over to hfa384x_cbrrid() since the handling
*       is virtually identical.
*
* Arguments:
*       hw              device structure
*       mode            DOWAIT or DOASYNC
*       rid             Read RID number (host order)
*       riddata         Caller supplied buffer that MAC formatted RID.data
*                       record will be written to for DOWAIT calls. Should
*                       be NULL for DOASYNC calls.
*       riddatalen      Buffer length for DOWAIT calls. Zero for DOASYNC calls.
*       cmdcb           command callback for async calls, NULL for DOWAIT calls
*       usercb          user callback for async calls, NULL for DOWAIT calls
*       usercb_data     user supplied data pointer for async calls, NULL
*                       for DOWAIT calls
*
* Returns:
*       0               success
*       -EIO            CTLX failure
*       -ERESTARTSYS    Awakened on signal
*       -ENODATA        riddatalen != macdatalen
*       >0              command indicated error, Status and Resp0-2 are
*                       in hw structure.
*
* Side effects:
*
* Call context:
*       interrupt (DOASYNC)
*       process (DOWAIT or DOASYNC)
----------------------------------------------------------------*/
static int
hfa384x_dorrid(hfa384x_t *hw,
               enum cmd_mode mode,
               u16 rid,
               void *riddata,
               unsigned int riddatalen,
               ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data)
{
        int result;
        hfa384x_usbctlx_t *ctlx;

        ctlx = usbctlx_alloc();
        if (ctlx == NULL) {
                result = -ENOMEM;
                goto done;
        }

        /* Initialize the command */
        ctlx->outbuf.rridreq.type = cpu_to_le16(HFA384x_USB_RRIDREQ);
        ctlx->outbuf.rridreq.frmlen =
            cpu_to_le16(sizeof(ctlx->outbuf.rridreq.rid));
        ctlx->outbuf.rridreq.rid = cpu_to_le16(rid);

        ctlx->outbufsize = sizeof(ctlx->outbuf.rridreq);

        ctlx->reapable = mode;
        ctlx->cmdcb = cmdcb;
        ctlx->usercb = usercb;
        ctlx->usercb_data = usercb_data;

        /* Submit the CTLX */
        result = hfa384x_usbctlx_submit(hw, ctlx);
        if (result != 0) {
                kfree(ctlx);
        } else if (mode == DOWAIT) {
                struct usbctlx_rrid_completor completor;

                result =
                    hfa384x_usbctlx_complete_sync(hw, ctlx,
                                                  init_rrid_completor
                                                  (&completor,
                                                   &ctlx->inbuf.rridresp,
                                                   riddata, riddatalen));
        }

done:
        return result;
}

/*----------------------------------------------------------------
* hfa384x_dowrid
*
* Constructs a write rid CTLX and issues it.
*
* NOTE: Any changes to the 'post-submit' code in this function
*       need to be carried over to hfa384x_cbwrid() since the handling
*       is virtually identical.
*
* Arguments:
*       hw              device structure
*       enum cmd_mode   DOWAIT or DOASYNC
*       rid             RID code
*       riddata         Data portion of RID formatted for MAC
*       riddatalen      Length of the data portion in bytes
*       cmdcb           command callback for async calls, NULL for DOWAIT calls
*       usercb          user callback for async calls, NULL for DOWAIT calls
*       usercb_data     user supplied data pointer for async calls
*
* Returns:
*       0               success
*       -ETIMEDOUT      timed out waiting for register ready or
*                       command completion
*       >0              command indicated error, Status and Resp0-2 are
*                       in hw structure.
*
* Side effects:
*
* Call context:
*       interrupt (DOASYNC)
*       process (DOWAIT or DOASYNC)
----------------------------------------------------------------*/
static int
hfa384x_dowrid(hfa384x_t *hw,
               enum cmd_mode mode,
               u16 rid,
               void *riddata,
               unsigned int riddatalen,
               ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data)
{
        int result;
        hfa384x_usbctlx_t *ctlx;

        ctlx = usbctlx_alloc();
        if (ctlx == NULL) {
                result = -ENOMEM;
                goto done;
        }

        /* Initialize the command */
        ctlx->outbuf.wridreq.type = cpu_to_le16(HFA384x_USB_WRIDREQ);
        ctlx->outbuf.wridreq.frmlen = cpu_to_le16((sizeof
                                                   (ctlx->outbuf.wridreq.rid) +
                                                   riddatalen + 1) / 2);
        ctlx->outbuf.wridreq.rid = cpu_to_le16(rid);
        memcpy(ctlx->outbuf.wridreq.data, riddata, riddatalen);

        ctlx->outbufsize = sizeof(ctlx->outbuf.wridreq.type) +
            sizeof(ctlx->outbuf.wridreq.frmlen) +
            sizeof(ctlx->outbuf.wridreq.rid) + riddatalen;

        ctlx->reapable = mode;
        ctlx->cmdcb = cmdcb;
        ctlx->usercb = usercb;
        ctlx->usercb_data = usercb_data;

        /* Submit the CTLX */
        result = hfa384x_usbctlx_submit(hw, ctlx);
        if (result != 0) {
                kfree(ctlx);
        } else if (mode == DOWAIT) {
                usbctlx_wrid_completor_t completor;
                hfa384x_cmdresult_t wridresult;

                result = hfa384x_usbctlx_complete_sync(hw,
                                                       ctlx,
                                                       init_wrid_completor
                                                       (&completor,
                                                        &ctlx->inbuf.wridresp,
                                                        &wridresult));
        }

done:
        return result;
}

/*----------------------------------------------------------------
* hfa384x_dormem
*
* Constructs a readmem CTLX and issues it.
*
* NOTE: Any changes to the 'post-submit' code in this function
*       need to be carried over to hfa384x_cbrmem() since the handling
*       is virtually identical.
*
* Arguments:
*       hw              device structure
*       mode            DOWAIT or DOASYNC
*       page            MAC address space page (CMD format)
*       offset          MAC address space offset
*       data            Ptr to data buffer to receive read
*       len             Length of the data to read (max == 2048)
*       cmdcb           command callback for async calls, NULL for DOWAIT calls
*       usercb          user callback for async calls, NULL for DOWAIT calls
*       usercb_data     user supplied data pointer for async calls
*
* Returns:
*       0               success
*       -ETIMEDOUT      timed out waiting for register ready or
*                       command completion
*       >0              command indicated error, Status and Resp0-2 are
*                       in hw structure.
*
* Side effects:
*
* Call context:
*       interrupt (DOASYNC)
*       process (DOWAIT or DOASYNC)
----------------------------------------------------------------*/
static int
hfa384x_dormem(hfa384x_t *hw,
               enum cmd_mode mode,
               u16 page,
               u16 offset,
               void *data,
               unsigned int len,
               ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data)
{
        int result;
        hfa384x_usbctlx_t *ctlx;

        ctlx = usbctlx_alloc();
        if (ctlx == NULL) {
                result = -ENOMEM;
                goto done;
        }

        /* Initialize the command */
        ctlx->outbuf.rmemreq.type = cpu_to_le16(HFA384x_USB_RMEMREQ);
        ctlx->outbuf.rmemreq.frmlen =
            cpu_to_le16(sizeof(ctlx->outbuf.rmemreq.offset) +
                        sizeof(ctlx->outbuf.rmemreq.page) + len);
        ctlx->outbuf.rmemreq.offset = cpu_to_le16(offset);
        ctlx->outbuf.rmemreq.page = cpu_to_le16(page);

        ctlx->outbufsize = sizeof(ctlx->outbuf.rmemreq);

        pr_debug("type=0x%04x frmlen=%d offset=0x%04x page=0x%04x\n",
                 ctlx->outbuf.rmemreq.type,
                 ctlx->outbuf.rmemreq.frmlen,
                 ctlx->outbuf.rmemreq.offset, ctlx->outbuf.rmemreq.page);

        pr_debug("pktsize=%zd\n", ROUNDUP64(sizeof(ctlx->outbuf.rmemreq)));

        ctlx->reapable = mode;
        ctlx->cmdcb = cmdcb;
        ctlx->usercb = usercb;
        ctlx->usercb_data = usercb_data;

        result = hfa384x_usbctlx_submit(hw, ctlx);
        if (result != 0) {
                kfree(ctlx);
        } else if (mode == DOWAIT) {
                usbctlx_rmem_completor_t completor;

                result =
                    hfa384x_usbctlx_complete_sync(hw, ctlx,
                                                  init_rmem_completor
                                                  (&completor,
                                                   &ctlx->inbuf.rmemresp, data,
                                                   len));
        }

done:
        return result;
}

/*----------------------------------------------------------------
* hfa384x_dowmem
*
* Constructs a writemem CTLX and issues it.
*
* NOTE: Any changes to the 'post-submit' code in this function
*       need to be carried over to hfa384x_cbwmem() since the handling
*       is virtually identical.
*
* Arguments:
*       hw              device structure
*       mode            DOWAIT or DOASYNC
*       page            MAC address space page (CMD format)
*       offset          MAC address space offset
*       data            Ptr to data buffer containing write data
*       len             Length of the data to read (max == 2048)
*       cmdcb           command callback for async calls, NULL for DOWAIT calls
*       usercb          user callback for async calls, NULL for DOWAIT calls
*       usercb_data     user supplied data pointer for async calls.
*
* Returns:
*       0               success
*       -ETIMEDOUT      timed out waiting for register ready or
*                       command completion
*       >0              command indicated error, Status and Resp0-2 are
*                       in hw structure.
*
* Side effects:
*
* Call context:
*       interrupt (DOWAIT)
*       process (DOWAIT or DOASYNC)
----------------------------------------------------------------*/
static int
hfa384x_dowmem(hfa384x_t *hw,
               enum cmd_mode mode,
               u16 page,
               u16 offset,
               void *data,
               unsigned int len,
               ctlx_cmdcb_t cmdcb, ctlx_usercb_t usercb, void *usercb_data)
{
        int result;
        hfa384x_usbctlx_t *ctlx;

        pr_debug("page=0x%04x offset=0x%04x len=%d\n", page, offset, len);

        ctlx = usbctlx_alloc();
        if (ctlx == NULL) {
                result = -ENOMEM;
                goto done;
        }

        /* Initialize the command */
        ctlx->outbuf.wmemreq.type = cpu_to_le16(HFA384x_USB_WMEMREQ);
        ctlx->outbuf.wmemreq.frmlen =
            cpu_to_le16(sizeof(ctlx->outbuf.wmemreq.offset) +
                        sizeof(ctlx->outbuf.wmemreq.page) + len);
        ctlx->outbuf.wmemreq.offset = cpu_to_le16(offset);
        ctlx->outbuf.wmemreq.page = cpu_to_le16(page);
        memcpy(ctlx->outbuf.wmemreq.data, data, len);

        ctlx->outbufsize = sizeof(ctlx->outbuf.wmemreq.type) +
            sizeof(ctlx->outbuf.wmemreq.frmlen) +
            sizeof(ctlx->outbuf.wmemreq.offset) +
            sizeof(ctlx->outbuf.wmemreq.page) + len;

        ctlx->reapable = mode;
        ctlx->cmdcb = cmdcb;
        ctlx->usercb = usercb;
        ctlx->usercb_data = usercb_data;

        result = hfa384x_usbctlx_submit(hw, ctlx);
        if (result != 0) {
                kfree(ctlx);
        } else if (mode == DOWAIT) {
                usbctlx_wmem_completor_t completor;
                hfa384x_cmdresult_t wmemresult;

                result = hfa384x_usbctlx_complete_sync(hw,
                                                       ctlx,
                                                       init_wmem_completor
                                                       (&completor,
                                                        &ctlx->inbuf.wmemresp,
                                                        &wmemresult));
        }

done:
        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_commtallies
*
* Send a commtallies inquiry to the MAC.  Note that this is an async
* call that will result in an info frame arriving sometime later.
*
* Arguments:
*       hw              device structure
*
* Returns:
*       zero            success.
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_commtallies(hfa384x_t *hw)
{
        hfa384x_metacmd_t cmd;

        cmd.cmd = HFA384x_CMDCODE_INQ;
        cmd.parm0 = HFA384x_IT_COMMTALLIES;
        cmd.parm1 = 0;
        cmd.parm2 = 0;

        hfa384x_docmd_async(hw, &cmd, NULL, NULL, NULL);

        return 0;
}

/*----------------------------------------------------------------
* hfa384x_drvr_disable
*
* Issues the disable command to stop communications on one of
* the MACs 'ports'.  Only macport 0 is valid  for stations.
* APs may also disable macports 1-6.  Only ports that have been
* previously enabled may be disabled.
*
* Arguments:
*       hw              device structure
*       macport         MAC port number (host order)
*
* Returns:
*       0               success
*       >0              f/w reported failure - f/w status code
*       <0              driver reported error (timeout|bad arg)
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_disable(hfa384x_t *hw, u16 macport)
{
        int result = 0;

        if ((!hw->isap && macport != 0) ||
            (hw->isap && !(macport <= HFA384x_PORTID_MAX)) ||
            !(hw->port_enabled[macport])) {
                result = -EINVAL;
        } else {
                result = hfa384x_cmd_disable(hw, macport);
                if (result == 0)
                        hw->port_enabled[macport] = 0;
        }
        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_enable
*
* Issues the enable command to enable communications on one of
* the MACs 'ports'.  Only macport 0 is valid  for stations.
* APs may also enable macports 1-6.  Only ports that are currently
* disabled may be enabled.
*
* Arguments:
*       hw              device structure
*       macport         MAC port number
*
* Returns:
*       0               success
*       >0              f/w reported failure - f/w status code
*       <0              driver reported error (timeout|bad arg)
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_enable(hfa384x_t *hw, u16 macport)
{
        int result = 0;

        if ((!hw->isap && macport != 0) ||
            (hw->isap && !(macport <= HFA384x_PORTID_MAX)) ||
            (hw->port_enabled[macport])) {
                result = -EINVAL;
        } else {
                result = hfa384x_cmd_enable(hw, macport);
                if (result == 0)
                        hw->port_enabled[macport] = 1;
        }
        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_flashdl_enable
*
* Begins the flash download state.  Checks to see that we're not
* already in a download state and that a port isn't enabled.
* Sets the download state and retrieves the flash download
* buffer location, buffer size, and timeout length.
*
* Arguments:
*       hw              device structure
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_flashdl_enable(hfa384x_t *hw)
{
        int result = 0;
        int i;

        /* Check that a port isn't active */
        for (i = 0; i < HFA384x_PORTID_MAX; i++) {
                if (hw->port_enabled[i]) {
                        pr_debug("called when port enabled.\n");
                        return -EINVAL;
                }
        }

        /* Check that we're not already in a download state */
        if (hw->dlstate != HFA384x_DLSTATE_DISABLED)
                return -EINVAL;

        /* Retrieve the buffer loc&size and timeout */
        result = hfa384x_drvr_getconfig(hw, HFA384x_RID_DOWNLOADBUFFER,
                                        &(hw->bufinfo), sizeof(hw->bufinfo));
        if (result)
                return result;

        hw->bufinfo.page = le16_to_cpu(hw->bufinfo.page);
        hw->bufinfo.offset = le16_to_cpu(hw->bufinfo.offset);
        hw->bufinfo.len = le16_to_cpu(hw->bufinfo.len);
        result = hfa384x_drvr_getconfig16(hw, HFA384x_RID_MAXLOADTIME,
                                          &(hw->dltimeout));
        if (result)
                return result;

        hw->dltimeout = le16_to_cpu(hw->dltimeout);

        pr_debug("flashdl_enable\n");

        hw->dlstate = HFA384x_DLSTATE_FLASHENABLED;

        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_flashdl_disable
*
* Ends the flash download state.  Note that this will cause the MAC
* firmware to restart.
*
* Arguments:
*       hw              device structure
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_flashdl_disable(hfa384x_t *hw)
{
        /* Check that we're already in the download state */
        if (hw->dlstate != HFA384x_DLSTATE_FLASHENABLED)
                return -EINVAL;

        pr_debug("flashdl_enable\n");

        /* There isn't much we can do at this point, so I don't */
        /*  bother  w/ the return value */
        hfa384x_cmd_download(hw, HFA384x_PROGMODE_DISABLE, 0, 0, 0);
        hw->dlstate = HFA384x_DLSTATE_DISABLED;

        return 0;
}

/*----------------------------------------------------------------
* hfa384x_drvr_flashdl_write
*
* Performs a FLASH download of a chunk of data. First checks to see
* that we're in the FLASH download state, then sets the download
* mode, uses the aux functions to 1) copy the data to the flash
* buffer, 2) sets the download 'write flash' mode, 3) readback and
* compare.  Lather rinse, repeat as many times an necessary to get
* all the given data into flash.
* When all data has been written using this function (possibly
* repeatedly), call drvr_flashdl_disable() to end the download state
* and restart the MAC.
*
* Arguments:
*       hw              device structure
*       daddr           Card address to write to. (host order)
*       buf             Ptr to data to write.
*       len             Length of data (host order).
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_flashdl_write(hfa384x_t *hw, u32 daddr, void *buf, u32 len)
{
        int result = 0;
        u32 dlbufaddr;
        int nburns;
        u32 burnlen;
        u32 burndaddr;
        u16 burnlo;
        u16 burnhi;
        int nwrites;
        u8 *writebuf;
        u16 writepage;
        u16 writeoffset;
        u32 writelen;
        int i;
        int j;

        pr_debug("daddr=0x%08x len=%d\n", daddr, len);

        /* Check that we're in the flash download state */
        if (hw->dlstate != HFA384x_DLSTATE_FLASHENABLED)
                return -EINVAL;

        printk(KERN_INFO "Download %d bytes to flash @0x%06x\n", len, daddr);

        /* Convert to flat address for arithmetic */
        /* NOTE: dlbuffer RID stores the address in AUX format */
        dlbufaddr =
            HFA384x_ADDR_AUX_MKFLAT(hw->bufinfo.page, hw->bufinfo.offset);
        pr_debug("dlbuf.page=0x%04x dlbuf.offset=0x%04x dlbufaddr=0x%08x\n",
                 hw->bufinfo.page, hw->bufinfo.offset, dlbufaddr);

#if 0
        printk(KERN_WARNING "dlbuf@0x%06lx len=%d to=%d\n", dlbufaddr,
               hw->bufinfo.len, hw->dltimeout);
#endif
        /* Calculations to determine how many fills of the dlbuffer to do
         * and how many USB wmemreq's to do for each fill.  At this point
         * in time, the dlbuffer size and the wmemreq size are the same.
         * Therefore, nwrites should always be 1.  The extra complexity
         * here is a hedge against future changes.
         */

        /* Figure out how many times to do the flash programming */
        nburns = len / hw->bufinfo.len;
        nburns += (len % hw->bufinfo.len) ? 1 : 0;

        /* For each flash program cycle, how many USB wmemreq's are needed? */
        nwrites = hw->bufinfo.len / HFA384x_USB_RWMEM_MAXLEN;
        nwrites += (hw->bufinfo.len % HFA384x_USB_RWMEM_MAXLEN) ? 1 : 0;

        /* For each burn */
        for (i = 0; i < nburns; i++) {
                /* Get the dest address and len */
                burnlen = (len - (hw->bufinfo.len * i)) > hw->bufinfo.len ?
                    hw->bufinfo.len : (len - (hw->bufinfo.len * i));
                burndaddr = daddr + (hw->bufinfo.len * i);
                burnlo = HFA384x_ADDR_CMD_MKOFF(burndaddr);
                burnhi = HFA384x_ADDR_CMD_MKPAGE(burndaddr);

                printk(KERN_INFO "Writing %d bytes to flash @0x%06x\n",
                       burnlen, burndaddr);

                /* Set the download mode */
                result = hfa384x_cmd_download(hw, HFA384x_PROGMODE_NV,
                                              burnlo, burnhi, burnlen);
                if (result) {
                        printk(KERN_ERR "download(NV,lo=%x,hi=%x,len=%x) "
                               "cmd failed, result=%d. Aborting d/l\n",
                               burnlo, burnhi, burnlen, result);
                        goto exit_proc;
                }

                /* copy the data to the flash download buffer */
                for (j = 0; j < nwrites; j++) {
                        writebuf = buf +
                            (i * hw->bufinfo.len) +
                            (j * HFA384x_USB_RWMEM_MAXLEN);

                        writepage = HFA384x_ADDR_CMD_MKPAGE(dlbufaddr +
                                                (j * HFA384x_USB_RWMEM_MAXLEN));
                        writeoffset = HFA384x_ADDR_CMD_MKOFF(dlbufaddr +
                                                (j * HFA384x_USB_RWMEM_MAXLEN));

                        writelen = burnlen - (j * HFA384x_USB_RWMEM_MAXLEN);
                        writelen = writelen > HFA384x_USB_RWMEM_MAXLEN ?
                            HFA384x_USB_RWMEM_MAXLEN : writelen;

                        result = hfa384x_dowmem_wait(hw,
                                                     writepage,
                                                     writeoffset,
                                                     writebuf, writelen);
                }

                /* set the download 'write flash' mode */
                result = hfa384x_cmd_download(hw,
                                              HFA384x_PROGMODE_NVWRITE,
                                              0, 0, 0);
                if (result) {
                        printk(KERN_ERR
                               "download(NVWRITE,lo=%x,hi=%x,len=%x) "
                               "cmd failed, result=%d. Aborting d/l\n",
                               burnlo, burnhi, burnlen, result);
                        goto exit_proc;
                }

                /* TODO: We really should do a readback and compare. */
        }

exit_proc:

        /* Leave the firmware in the 'post-prog' mode.  flashdl_disable will */
        /*  actually disable programming mode.  Remember, that will cause the */
        /*  the firmware to effectively reset itself. */

        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_getconfig
*
* Performs the sequence necessary to read a config/info item.
*
* Arguments:
*       hw              device structure
*       rid             config/info record id (host order)
*       buf             host side record buffer.  Upon return it will
*                       contain the body portion of the record (minus the
*                       RID and len).
*       len             buffer length (in bytes, should match record length)
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*       -ENODATA        length mismatch between argument and retrieved
*                       record.
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_getconfig(hfa384x_t *hw, u16 rid, void *buf, u16 len)
{
        int result;

        result = hfa384x_dorrid_wait(hw, rid, buf, len);

        return result;
}

/*----------------------------------------------------------------
 * hfa384x_drvr_getconfig_async
 *
 * Performs the sequence necessary to perform an async read of
 * of a config/info item.
 *
 * Arguments:
 *       hw              device structure
 *       rid             config/info record id (host order)
 *       buf             host side record buffer.  Upon return it will
 *                       contain the body portion of the record (minus the
 *                       RID and len).
 *       len             buffer length (in bytes, should match record length)
 *       cbfn            caller supplied callback, called when the command
 *                       is done (successful or not).
 *       cbfndata        pointer to some caller supplied data that will be
 *                       passed in as an argument to the cbfn.
 *
 * Returns:
 *       nothing         the cbfn gets a status argument identifying if
 *                       any errors occur.
 * Side effects:
 *       Queues an hfa384x_usbcmd_t for subsequent execution.
 *
 * Call context:
 *       Any
 ----------------------------------------------------------------*/
int
hfa384x_drvr_getconfig_async(hfa384x_t *hw,
                             u16 rid, ctlx_usercb_t usercb, void *usercb_data)
{
        return hfa384x_dorrid_async(hw, rid, NULL, 0,
                                    hfa384x_cb_rrid, usercb, usercb_data);
}

/*----------------------------------------------------------------
 * hfa384x_drvr_setconfig_async
 *
 * Performs the sequence necessary to write a config/info item.
 *
 * Arguments:
 *       hw              device structure
 *       rid             config/info record id (in host order)
 *       buf             host side record buffer
 *       len             buffer length (in bytes)
 *       usercb          completion callback
 *       usercb_data     completion callback argument
 *
 * Returns:
 *       0               success
 *       >0              f/w reported error - f/w status code
 *       <0              driver reported error
 *
 * Side effects:
 *
 * Call context:
 *       process
 ----------------------------------------------------------------*/
int
hfa384x_drvr_setconfig_async(hfa384x_t *hw,
                             u16 rid,
                             void *buf,
                             u16 len, ctlx_usercb_t usercb, void *usercb_data)
{
        return hfa384x_dowrid_async(hw, rid, buf, len,
                                    hfa384x_cb_status, usercb, usercb_data);
}

/*----------------------------------------------------------------
* hfa384x_drvr_ramdl_disable
*
* Ends the ram download state.
*
* Arguments:
*       hw              device structure
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_ramdl_disable(hfa384x_t *hw)
{
        /* Check that we're already in the download state */
        if (hw->dlstate != HFA384x_DLSTATE_RAMENABLED)
                return -EINVAL;

        pr_debug("ramdl_disable()\n");

        /* There isn't much we can do at this point, so I don't */
        /*  bother  w/ the return value */
        hfa384x_cmd_download(hw, HFA384x_PROGMODE_DISABLE, 0, 0, 0);
        hw->dlstate = HFA384x_DLSTATE_DISABLED;

        return 0;
}

/*----------------------------------------------------------------
* hfa384x_drvr_ramdl_enable
*
* Begins the ram download state.  Checks to see that we're not
* already in a download state and that a port isn't enabled.
* Sets the download state and calls cmd_download with the
* ENABLE_VOLATILE subcommand and the exeaddr argument.
*
* Arguments:
*       hw              device structure
*       exeaddr         the card execution address that will be
*                       jumped to when ramdl_disable() is called
*                       (host order).
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_ramdl_enable(hfa384x_t *hw, u32 exeaddr)
{
        int result = 0;
        u16 lowaddr;
        u16 hiaddr;
        int i;

        /* Check that a port isn't active */
        for (i = 0; i < HFA384x_PORTID_MAX; i++) {
                if (hw->port_enabled[i]) {
                        printk(KERN_ERR
                               "Can't download with a macport enabled.\n");
                        return -EINVAL;
                }
        }

        /* Check that we're not already in a download state */
        if (hw->dlstate != HFA384x_DLSTATE_DISABLED) {
                printk(KERN_ERR "Download state not disabled.\n");
                return -EINVAL;
        }

        pr_debug("ramdl_enable, exeaddr=0x%08x\n", exeaddr);

        /* Call the download(1,addr) function */
        lowaddr = HFA384x_ADDR_CMD_MKOFF(exeaddr);
        hiaddr = HFA384x_ADDR_CMD_MKPAGE(exeaddr);

        result = hfa384x_cmd_download(hw, HFA384x_PROGMODE_RAM,
                                      lowaddr, hiaddr, 0);

        if (result == 0) {
                /* Set the download state */
                hw->dlstate = HFA384x_DLSTATE_RAMENABLED;
        } else {
                pr_debug("cmd_download(0x%04x, 0x%04x) failed, result=%d.\n",
                         lowaddr, hiaddr, result);
        }

        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_ramdl_write
*
* Performs a RAM download of a chunk of data. First checks to see
* that we're in the RAM download state, then uses the [read|write]mem USB
* commands to 1) copy the data, 2) readback and compare.  The download
* state is unaffected.  When all data has been written using
* this function, call drvr_ramdl_disable() to end the download state
* and restart the MAC.
*
* Arguments:
*       hw              device structure
*       daddr           Card address to write to. (host order)
*       buf             Ptr to data to write.
*       len             Length of data (host order).
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_ramdl_write(hfa384x_t *hw, u32 daddr, void *buf, u32 len)
{
        int result = 0;
        int nwrites;
        u8 *data = buf;
        int i;
        u32 curraddr;
        u16 currpage;
        u16 curroffset;
        u16 currlen;

        /* Check that we're in the ram download state */
        if (hw->dlstate != HFA384x_DLSTATE_RAMENABLED)
                return -EINVAL;

        printk(KERN_INFO "Writing %d bytes to ram @0x%06x\n", len, daddr);

        /* How many dowmem calls?  */
        nwrites = len / HFA384x_USB_RWMEM_MAXLEN;
        nwrites += len % HFA384x_USB_RWMEM_MAXLEN ? 1 : 0;

        /* Do blocking wmem's */
        for (i = 0; i < nwrites; i++) {
                /* make address args */
                curraddr = daddr + (i * HFA384x_USB_RWMEM_MAXLEN);
                currpage = HFA384x_ADDR_CMD_MKPAGE(curraddr);
                curroffset = HFA384x_ADDR_CMD_MKOFF(curraddr);
                currlen = len - (i * HFA384x_USB_RWMEM_MAXLEN);
                if (currlen > HFA384x_USB_RWMEM_MAXLEN)
                        currlen = HFA384x_USB_RWMEM_MAXLEN;

                /* Do blocking ctlx */
                result = hfa384x_dowmem_wait(hw,
                                             currpage,
                                             curroffset,
                                             data +
                                             (i * HFA384x_USB_RWMEM_MAXLEN),
                                             currlen);

                if (result)
                        break;

                /* TODO: We really should have a readback. */
        }

        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_readpda
*
* Performs the sequence to read the PDA space.  Note there is no
* drvr_writepda() function.  Writing a PDA is
* generally implemented by a calling component via calls to
* cmd_download and writing to the flash download buffer via the
* aux regs.
*
* Arguments:
*       hw              device structure
*       buf             buffer to store PDA in
*       len             buffer length
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*       -ETIMEDOUT      timout waiting for the cmd regs to become
*                       available, or waiting for the control reg
*                       to indicate the Aux port is enabled.
*       -ENODATA        the buffer does NOT contain a valid PDA.
*                       Either the card PDA is bad, or the auxdata
*                       reads are giving us garbage.

*
* Side effects:
*
* Call context:
*       process or non-card interrupt.
----------------------------------------------------------------*/
int hfa384x_drvr_readpda(hfa384x_t *hw, void *buf, unsigned int len)
{
        int result = 0;
        u16 *pda = buf;
        int pdaok = 0;
        int morepdrs = 1;
        int currpdr = 0;        /* word offset of the current pdr */
        size_t i;
        u16 pdrlen;             /* pdr length in bytes, host order */
        u16 pdrcode;            /* pdr code, host order */
        u16 currpage;
        u16 curroffset;
        struct pdaloc {
                u32 cardaddr;
                u16 auxctl;
        } pdaloc[] = {
                {
                HFA3842_PDA_BASE, 0}, {
                HFA3841_PDA_BASE, 0}, {
                HFA3841_PDA_BOGUS_BASE, 0}
        };

        /* Read the pda from each known address.  */
        for (i = 0; i < ARRAY_SIZE(pdaloc); i++) {
                /* Make address */
                currpage = HFA384x_ADDR_CMD_MKPAGE(pdaloc[i].cardaddr);
                curroffset = HFA384x_ADDR_CMD_MKOFF(pdaloc[i].cardaddr);

                /* units of bytes */
                result = hfa384x_dormem_wait(hw, currpage, curroffset, buf,
                                                len);

                if (result) {
                        printk(KERN_WARNING
                               "Read from index %zd failed, continuing\n", i);
                        continue;
                }

                /* Test for garbage */
                pdaok = 1;      /* initially assume good */
                morepdrs = 1;
                while (pdaok && morepdrs) {
                        pdrlen = le16_to_cpu(pda[currpdr]) * 2;
                        pdrcode = le16_to_cpu(pda[currpdr + 1]);
                        /* Test the record length */
                        if (pdrlen > HFA384x_PDR_LEN_MAX || pdrlen == 0) {
                                printk(KERN_ERR "pdrlen invalid=%d\n", pdrlen);
                                pdaok = 0;
                                break;
                        }
                        /* Test the code */
                        if (!hfa384x_isgood_pdrcode(pdrcode)) {
                                printk(KERN_ERR "pdrcode invalid=%d\n",
                                       pdrcode);
                                pdaok = 0;
                                break;
                        }
                        /* Test for completion */
                        if (pdrcode == HFA384x_PDR_END_OF_PDA)
                                morepdrs = 0;

                        /* Move to the next pdr (if necessary) */
                        if (morepdrs) {
                                /* note the access to pda[], need words here */
                                currpdr += le16_to_cpu(pda[currpdr]) + 1;
                        }
                }
                if (pdaok) {
                        printk(KERN_INFO
                               "PDA Read from 0x%08x in %s space.\n",
                               pdaloc[i].cardaddr,
                               pdaloc[i].auxctl == 0 ? "EXTDS" :
                               pdaloc[i].auxctl == 1 ? "NV" :
                               pdaloc[i].auxctl == 2 ? "PHY" :
                               pdaloc[i].auxctl == 3 ? "ICSRAM" :
                               "<bogus auxctl>");
                        break;
                }
        }
        result = pdaok ? 0 : -ENODATA;

        if (result)
                pr_debug("Failure: pda is not okay\n");

        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_setconfig
*
* Performs the sequence necessary to write a config/info item.
*
* Arguments:
*       hw              device structure
*       rid             config/info record id (in host order)
*       buf             host side record buffer
*       len             buffer length (in bytes)
*
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_setconfig(hfa384x_t *hw, u16 rid, void *buf, u16 len)
{
        return hfa384x_dowrid_wait(hw, rid, buf, len);
}

/*----------------------------------------------------------------
* hfa384x_drvr_start
*
* Issues the MAC initialize command, sets up some data structures,
* and enables the interrupts.  After this function completes, the
* low-level stuff should be ready for any/all commands.
*
* Arguments:
*       hw              device structure
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/

int hfa384x_drvr_start(hfa384x_t *hw)
{
        int result, result1, result2;
        u16 status;

        might_sleep();

        /* Clear endpoint stalls - but only do this if the endpoint
         * is showing a stall status. Some prism2 cards seem to behave
         * badly if a clear_halt is called when the endpoint is already
         * ok
         */
        result =
            usb_get_status(hw->usb, USB_RECIP_ENDPOINT, hw->endp_in, &status);
        if (result < 0) {
                printk(KERN_ERR "Cannot get bulk in endpoint status.\n");
                goto done;
        }
        if ((status == 1) && usb_clear_halt(hw->usb, hw->endp_in))
                printk(KERN_ERR "Failed to reset bulk in endpoint.\n");

        result =
            usb_get_status(hw->usb, USB_RECIP_ENDPOINT, hw->endp_out, &status);
        if (result < 0) {
                printk(KERN_ERR "Cannot get bulk out endpoint status.\n");
                goto done;
        }
        if ((status == 1) && usb_clear_halt(hw->usb, hw->endp_out))
                printk(KERN_ERR "Failed to reset bulk out endpoint.\n");

        /* Synchronous unlink, in case we're trying to restart the driver */
        usb_kill_urb(&hw->rx_urb);

        /* Post the IN urb */
        result = submit_rx_urb(hw, GFP_KERNEL);
        if (result != 0) {
                printk(KERN_ERR
                       "Fatal, failed to submit RX URB, result=%d\n", result);
                goto done;
        }

        /* Call initialize twice, with a 1 second sleep in between.
         * This is a nasty work-around since many prism2 cards seem to
         * need time to settle after an init from cold. The second
         * call to initialize in theory is not necessary - but we call
         * it anyway as a double insurance policy:
         * 1) If the first init should fail, the second may well succeed
         *    and the card can still be used
         * 2) It helps ensures all is well with the card after the first
         *    init and settle time.
         */
        result1 = hfa384x_cmd_initialize(hw);
        msleep(1000);
        result = result2 = hfa384x_cmd_initialize(hw);
        if (result1 != 0) {
                if (result2 != 0) {
                        printk(KERN_ERR
                                "cmd_initialize() failed on two attempts, results %d and %d\n",
                                result1, result2);
                        usb_kill_urb(&hw->rx_urb);
                        goto done;
                } else {
                        pr_debug("First cmd_initialize() failed (result %d),\n",
                                 result1);
                        pr_debug("but second attempt succeeded. All should be ok\n");
                }
        } else if (result2 != 0) {
                printk(KERN_WARNING "First cmd_initialize() succeeded, but second attempt failed (result=%d)\n",
                        result2);
                printk(KERN_WARNING
                       "Most likely the card will be functional\n");
                goto done;
        }

        hw->state = HFA384x_STATE_RUNNING;

done:
        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_stop
*
* Shuts down the MAC to the point where it is safe to unload the
* driver.  Any subsystem that may be holding a data or function
* ptr into the driver must be cleared/deinitialized.
*
* Arguments:
*       hw              device structure
* Returns:
*       0               success
*       >0              f/w reported error - f/w status code
*       <0              driver reported error
*
* Side effects:
*
* Call context:
*       process
----------------------------------------------------------------*/
int hfa384x_drvr_stop(hfa384x_t *hw)
{
        int result = 0;
        int i;

        might_sleep();

        /* There's no need for spinlocks here. The USB "disconnect"
         * function sets this "removed" flag and then calls us.
         */
        if (!hw->wlandev->hwremoved) {
                /* Call initialize to leave the MAC in its 'reset' state */
                hfa384x_cmd_initialize(hw);

                /* Cancel the rxurb */
                usb_kill_urb(&hw->rx_urb);
        }

        hw->link_status = HFA384x_LINK_NOTCONNECTED;
        hw->state = HFA384x_STATE_INIT;

        del_timer_sync(&hw->commsqual_timer);

        /* Clear all the port status */
        for (i = 0; i < HFA384x_NUMPORTS_MAX; i++)
                hw->port_enabled[i] = 0;

        return result;
}

/*----------------------------------------------------------------
* hfa384x_drvr_txframe
*
* Takes a frame from prism2sta and queues it for transmission.
*
* Arguments:
*       hw              device structure
*       skb             packet buffer struct.  Contains an 802.11
*                       data frame.
*       p80211_hdr      points to the 802.11 header for the packet.
* Returns:
*       0               Success and more buffs available
*       1               Success but no more buffs
*       2               Allocation failure
*       4               Buffer full or queue busy
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
int hfa384x_drvr_txframe(hfa384x_t *hw, struct sk_buff *skb,
                         union p80211_hdr *p80211_hdr,
                         struct p80211_metawep *p80211_wep)
{
        int usbpktlen = sizeof(hfa384x_tx_frame_t);
        int result;
        int ret;
        char *ptr;

        if (hw->tx_urb.status == -EINPROGRESS) {
                printk(KERN_WARNING "TX URB already in use\n");
                result = 3;
                goto exit;
        }

        /* Build Tx frame structure */
        /* Set up the control field */
        memset(&hw->txbuff.txfrm.desc, 0, sizeof(hw->txbuff.txfrm.desc));

        /* Setup the usb type field */
        hw->txbuff.type = cpu_to_le16(HFA384x_USB_TXFRM);

        /* Set up the sw_support field to identify this frame */
        hw->txbuff.txfrm.desc.sw_support = 0x0123;

/* Tx complete and Tx exception disable per dleach.  Might be causing
 * buf depletion
 */
/* #define DOEXC  SLP -- doboth breaks horribly under load, doexc less so. */
#if defined(DOBOTH)
        hw->txbuff.txfrm.desc.tx_control =
            HFA384x_TX_MACPORT_SET(0) | HFA384x_TX_STRUCTYPE_SET(1) |
            HFA384x_TX_TXEX_SET(1) | HFA384x_TX_TXOK_SET(1);
#elif defined(DOEXC)
        hw->txbuff.txfrm.desc.tx_control =
            HFA384x_TX_MACPORT_SET(0) | HFA384x_TX_STRUCTYPE_SET(1) |
            HFA384x_TX_TXEX_SET(1) | HFA384x_TX_TXOK_SET(0);
#else
        hw->txbuff.txfrm.desc.tx_control =
            HFA384x_TX_MACPORT_SET(0) | HFA384x_TX_STRUCTYPE_SET(1) |
            HFA384x_TX_TXEX_SET(0) | HFA384x_TX_TXOK_SET(0);
#endif
        hw->txbuff.txfrm.desc.tx_control =
            cpu_to_le16(hw->txbuff.txfrm.desc.tx_control);

        /* copy the header over to the txdesc */
        memcpy(&(hw->txbuff.txfrm.desc.frame_control), p80211_hdr,
               sizeof(union p80211_hdr));

        /* if we're using host WEP, increase size by IV+ICV */
        if (p80211_wep->data) {
                hw->txbuff.txfrm.desc.data_len = cpu_to_le16(skb->len + 8);
                usbpktlen += 8;
        } else {
                hw->txbuff.txfrm.desc.data_len = cpu_to_le16(skb->len);
        }

        usbpktlen += skb->len;

        /* copy over the WEP IV if we are using host WEP */
        ptr = hw->txbuff.txfrm.data;
        if (p80211_wep->data) {
                memcpy(ptr, p80211_wep->iv, sizeof(p80211_wep->iv));
                ptr += sizeof(p80211_wep->iv);
                memcpy(ptr, p80211_wep->data, skb->len);
        } else {
                memcpy(ptr, skb->data, skb->len);
        }
        /* copy over the packet data */
        ptr += skb->len;

        /* copy over the WEP ICV if we are using host WEP */
        if (p80211_wep->data)
                memcpy(ptr, p80211_wep->icv, sizeof(p80211_wep->icv));

        /* Send the USB packet */
        usb_fill_bulk_urb(&(hw->tx_urb), hw->usb,
                          hw->endp_out,
                          &(hw->txbuff), ROUNDUP64(usbpktlen),
                          hfa384x_usbout_callback, hw->wlandev);
        hw->tx_urb.transfer_flags |= USB_QUEUE_BULK;

        result = 1;
        ret = submit_tx_urb(hw, &hw->tx_urb, GFP_ATOMIC);
        if (ret != 0) {
                printk(KERN_ERR "submit_tx_urb() failed, error=%d\n", ret);
                result = 3;
        }

exit:
        return result;
}

void hfa384x_tx_timeout(wlandevice_t *wlandev)
{
        hfa384x_t *hw = wlandev->priv;
        unsigned long flags;

        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        if (!hw->wlandev->hwremoved) {
                int sched;

                sched = !test_and_set_bit(WORK_TX_HALT, &hw->usb_flags);
                sched |= !test_and_set_bit(WORK_RX_HALT, &hw->usb_flags);
                if (sched)
                        schedule_work(&hw->usb_work);
        }

        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
}

/*----------------------------------------------------------------
* hfa384x_usbctlx_reaper_task
*
* Tasklet to delete dead CTLX objects
*
* Arguments:
*       data    ptr to a hfa384x_t
*
* Returns:
*
* Call context:
*       Interrupt
----------------------------------------------------------------*/
static void hfa384x_usbctlx_reaper_task(unsigned long data)
{
        hfa384x_t *hw = (hfa384x_t *) data;
        struct list_head *entry;
        struct list_head *temp;
        unsigned long flags;

        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        /* This list is guaranteed to be empty if someone
         * has unplugged the adapter.
         */
        list_for_each_safe(entry, temp, &hw->ctlxq.reapable) {
                hfa384x_usbctlx_t *ctlx;

                ctlx = list_entry(entry, hfa384x_usbctlx_t, list);
                list_del(&ctlx->list);
                kfree(ctlx);
        }

        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);

}

/*----------------------------------------------------------------
* hfa384x_usbctlx_completion_task
*
* Tasklet to call completion handlers for returned CTLXs
*
* Arguments:
*       data    ptr to hfa384x_t
*
* Returns:
*       Nothing
*
* Call context:
*       Interrupt
----------------------------------------------------------------*/
static void hfa384x_usbctlx_completion_task(unsigned long data)
{
        hfa384x_t *hw = (hfa384x_t *) data;
        struct list_head *entry;
        struct list_head *temp;
        unsigned long flags;

        int reap = 0;

        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        /* This list is guaranteed to be empty if someone
         * has unplugged the adapter ...
         */
        list_for_each_safe(entry, temp, &hw->ctlxq.completing) {
                hfa384x_usbctlx_t *ctlx;

                ctlx = list_entry(entry, hfa384x_usbctlx_t, list);

                /* Call the completion function that this
                 * command was assigned, assuming it has one.
                 */
                if (ctlx->cmdcb != NULL) {
                        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                        ctlx->cmdcb(hw, ctlx);
                        spin_lock_irqsave(&hw->ctlxq.lock, flags);

                        /* Make sure we don't try and complete
                         * this CTLX more than once!
                         */
                        ctlx->cmdcb = NULL;

                        /* Did someone yank the adapter out
                         * while our list was (briefly) unlocked?
                         */
                        if (hw->wlandev->hwremoved) {
                                reap = 0;
                                break;
                        }
                }

                /*
                 * "Reapable" CTLXs are ones which don't have any
                 * threads waiting for them to die. Hence they must
                 * be delivered to The Reaper!
                 */
                if (ctlx->reapable) {
                        /* Move the CTLX off the "completing" list (hopefully)
                         * on to the "reapable" list where the reaper task
                         * can find it. And "reapable" means that this CTLX
                         * isn't sitting on a wait-queue somewhere.
                         */
                        list_move_tail(&ctlx->list, &hw->ctlxq.reapable);
                        reap = 1;
                }

                complete(&ctlx->done);
        }
        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);

        if (reap)
                tasklet_schedule(&hw->reaper_bh);
}

/*----------------------------------------------------------------
* unlocked_usbctlx_cancel_async
*
* Mark the CTLX dead asynchronously, and ensure that the
* next command on the queue is run afterwards.
*
* Arguments:
*       hw      ptr to the hfa384x_t structure
*       ctlx    ptr to a CTLX structure
*
* Returns:
*       0       the CTLX's URB is inactive
* -EINPROGRESS  the URB is currently being unlinked
*
* Call context:
*       Either process or interrupt, but presumably interrupt
----------------------------------------------------------------*/
static int unlocked_usbctlx_cancel_async(hfa384x_t *hw,
                                         hfa384x_usbctlx_t *ctlx)
{
        int ret;

        /*
         * Try to delete the URB containing our request packet.
         * If we succeed, then its completion handler will be
         * called with a status of -ECONNRESET.
         */
        hw->ctlx_urb.transfer_flags |= URB_ASYNC_UNLINK;
        ret = usb_unlink_urb(&hw->ctlx_urb);

        if (ret != -EINPROGRESS) {
                /*
                 * The OUT URB had either already completed
                 * or was still in the pending queue, so the
                 * URB's completion function will not be called.
                 * We will have to complete the CTLX ourselves.
                 */
                ctlx->state = CTLX_REQ_FAILED;
                unlocked_usbctlx_complete(hw, ctlx);
                ret = 0;
        }

        return ret;
}

/*----------------------------------------------------------------
* unlocked_usbctlx_complete
*
* A CTLX has completed.  It may have been successful, it may not
* have been. At this point, the CTLX should be quiescent.  The URBs
* aren't active and the timers should have been stopped.
*
* The CTLX is migrated to the "completing" queue, and the completing
* tasklet is scheduled.
*
* Arguments:
*       hw              ptr to a hfa384x_t structure
*       ctlx            ptr to a ctlx structure
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       Either, assume interrupt
----------------------------------------------------------------*/
static void unlocked_usbctlx_complete(hfa384x_t *hw, hfa384x_usbctlx_t *ctlx)
{
        /* Timers have been stopped, and ctlx should be in
         * a terminal state. Retire it from the "active"
         * queue.
         */
        list_move_tail(&ctlx->list, &hw->ctlxq.completing);
        tasklet_schedule(&hw->completion_bh);

        switch (ctlx->state) {
        case CTLX_COMPLETE:
        case CTLX_REQ_FAILED:
                /* This are the correct terminating states. */
                break;

        default:
                printk(KERN_ERR "CTLX[%d] not in a terminating state(%s)\n",
                       le16_to_cpu(ctlx->outbuf.type), ctlxstr(ctlx->state));
                break;
        }                       /* switch */
}

/*----------------------------------------------------------------
* hfa384x_usbctlxq_run
*
* Checks to see if the head item is running.  If not, starts it.
*
* Arguments:
*       hw      ptr to hfa384x_t
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       any
----------------------------------------------------------------*/
static void hfa384x_usbctlxq_run(hfa384x_t *hw)
{
        unsigned long flags;

        /* acquire lock */
        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        /* Only one active CTLX at any one time, because there's no
         * other (reliable) way to match the response URB to the
         * correct CTLX.
         *
         * Don't touch any of these CTLXs if the hardware
         * has been removed or the USB subsystem is stalled.
         */
        if (!list_empty(&hw->ctlxq.active) ||
            test_bit(WORK_TX_HALT, &hw->usb_flags) || hw->wlandev->hwremoved)
                goto unlock;

        while (!list_empty(&hw->ctlxq.pending)) {
                hfa384x_usbctlx_t *head;
                int result;

                /* This is the first pending command */
                head = list_entry(hw->ctlxq.pending.next,
                                  hfa384x_usbctlx_t, list);

                /* We need to split this off to avoid a race condition */
                list_move_tail(&head->list, &hw->ctlxq.active);

                /* Fill the out packet */
                usb_fill_bulk_urb(&(hw->ctlx_urb), hw->usb,
                                  hw->endp_out,
                                  &(head->outbuf), ROUNDUP64(head->outbufsize),
                                  hfa384x_ctlxout_callback, hw);
                hw->ctlx_urb.transfer_flags |= USB_QUEUE_BULK;

                /* Now submit the URB and update the CTLX's state */
                result = SUBMIT_URB(&hw->ctlx_urb, GFP_ATOMIC);
                if (result == 0) {
                        /* This CTLX is now running on the active queue */
                        head->state = CTLX_REQ_SUBMITTED;

                        /* Start the OUT wait timer */
                        hw->req_timer_done = 0;
                        hw->reqtimer.expires = jiffies + HZ;
                        add_timer(&hw->reqtimer);

                        /* Start the IN wait timer */
                        hw->resp_timer_done = 0;
                        hw->resptimer.expires = jiffies + 2 * HZ;
                        add_timer(&hw->resptimer);

                        break;
                }

                if (result == -EPIPE) {
                        /* The OUT pipe needs resetting, so put
                         * this CTLX back in the "pending" queue
                         * and schedule a reset ...
                         */
                        printk(KERN_WARNING
                               "%s tx pipe stalled: requesting reset\n",
                               hw->wlandev->netdev->name);
                        list_move(&head->list, &hw->ctlxq.pending);
                        set_bit(WORK_TX_HALT, &hw->usb_flags);
                        schedule_work(&hw->usb_work);
                        break;
                }

                if (result == -ESHUTDOWN) {
                        printk(KERN_WARNING "%s urb shutdown!\n",
                               hw->wlandev->netdev->name);
                        break;
                }

                printk(KERN_ERR "Failed to submit CTLX[%d]: error=%d\n",
                       le16_to_cpu(head->outbuf.type), result);
                unlocked_usbctlx_complete(hw, head);
        }                       /* while */

unlock:
        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
}

/*----------------------------------------------------------------
* hfa384x_usbin_callback
*
* Callback for URBs on the BULKIN endpoint.
*
* Arguments:
*       urb             ptr to the completed urb
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbin_callback(struct urb *urb)
{
        wlandevice_t *wlandev = urb->context;
        hfa384x_t *hw;
        hfa384x_usbin_t *usbin = (hfa384x_usbin_t *) urb->transfer_buffer;
        struct sk_buff *skb = NULL;
        int result;
        int urb_status;
        u16 type;

        enum USBIN_ACTION {
                HANDLE,
                RESUBMIT,
                ABORT
        } action;

        if (!wlandev || !wlandev->netdev || wlandev->hwremoved)
                goto exit;

        hw = wlandev->priv;
        if (!hw)
                goto exit;

        skb = hw->rx_urb_skb;
        BUG_ON(!skb || (skb->data != urb->transfer_buffer));

        hw->rx_urb_skb = NULL;

        /* Check for error conditions within the URB */
        switch (urb->status) {
        case 0:
                action = HANDLE;

                /* Check for short packet */
                if (urb->actual_length == 0) {
                        ++(wlandev->linux_stats.rx_errors);
                        ++(wlandev->linux_stats.rx_length_errors);
                        action = RESUBMIT;
                }
                break;

        case -EPIPE:
                printk(KERN_WARNING "%s rx pipe stalled: requesting reset\n",
                       wlandev->netdev->name);
                if (!test_and_set_bit(WORK_RX_HALT, &hw->usb_flags))
                        schedule_work(&hw->usb_work);
                ++(wlandev->linux_stats.rx_errors);
                action = ABORT;
                break;

        case -EILSEQ:
        case -ETIMEDOUT:
        case -EPROTO:
                if (!test_and_set_bit(THROTTLE_RX, &hw->usb_flags) &&
                    !timer_pending(&hw->throttle)) {
                        mod_timer(&hw->throttle, jiffies + THROTTLE_JIFFIES);
                }
                ++(wlandev->linux_stats.rx_errors);
                action = ABORT;
                break;

        case -EOVERFLOW:
                ++(wlandev->linux_stats.rx_over_errors);
                action = RESUBMIT;
                break;

        case -ENODEV:
        case -ESHUTDOWN:
                pr_debug("status=%d, device removed.\n", urb->status);
                action = ABORT;
                break;

        case -ENOENT:
        case -ECONNRESET:
                pr_debug("status=%d, urb explicitly unlinked.\n", urb->status);
                action = ABORT;
                break;

        default:
                pr_debug("urb status=%d, transfer flags=0x%x\n",
                         urb->status, urb->transfer_flags);
                ++(wlandev->linux_stats.rx_errors);
                action = RESUBMIT;
                break;
        }

        urb_status = urb->status;

        if (action != ABORT) {
                /* Repost the RX URB */
                result = submit_rx_urb(hw, GFP_ATOMIC);

                if (result != 0) {
                        printk(KERN_ERR
                               "Fatal, failed to resubmit rx_urb. error=%d\n",
                               result);
                }
        }

        /* Handle any USB-IN packet */
        /* Note: the check of the sw_support field, the type field doesn't
         *       have bit 12 set like the docs suggest.
         */
        type = le16_to_cpu(usbin->type);
        if (HFA384x_USB_ISRXFRM(type)) {
                if (action == HANDLE) {
                        if (usbin->txfrm.desc.sw_support == 0x0123) {
                                hfa384x_usbin_txcompl(wlandev, usbin);
                        } else {
                                skb_put(skb, sizeof(*usbin));
                                hfa384x_usbin_rx(wlandev, skb);
                                skb = NULL;
                        }
                }
                goto exit;
        }
        if (HFA384x_USB_ISTXFRM(type)) {
                if (action == HANDLE)
                        hfa384x_usbin_txcompl(wlandev, usbin);
                goto exit;
        }
        switch (type) {
        case HFA384x_USB_INFOFRM:
                if (action == ABORT)
                        goto exit;
                if (action == HANDLE)
                        hfa384x_usbin_info(wlandev, usbin);
                break;

        case HFA384x_USB_CMDRESP:
        case HFA384x_USB_WRIDRESP:
        case HFA384x_USB_RRIDRESP:
        case HFA384x_USB_WMEMRESP:
        case HFA384x_USB_RMEMRESP:
                /* ALWAYS, ALWAYS, ALWAYS handle this CTLX!!!! */
                hfa384x_usbin_ctlx(hw, usbin, urb_status);
                break;

        case HFA384x_USB_BUFAVAIL:
                pr_debug("Received BUFAVAIL packet, frmlen=%d\n",
                         usbin->bufavail.frmlen);
                break;

        case HFA384x_USB_ERROR:
                pr_debug("Received USB_ERROR packet, errortype=%d\n",
                         usbin->usberror.errortype);
                break;

        default:
                pr_debug("Unrecognized USBIN packet, type=%x, status=%d\n",
                         usbin->type, urb_status);
                break;
        }                       /* switch */

exit:

        if (skb)
                dev_kfree_skb(skb);
}

/*----------------------------------------------------------------
* hfa384x_usbin_ctlx
*
* We've received a URB containing a Prism2 "response" message.
* This message needs to be matched up with a CTLX on the active
* queue and our state updated accordingly.
*
* Arguments:
*       hw              ptr to hfa384x_t
*       usbin           ptr to USB IN packet
*       urb_status      status of this Bulk-In URB
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbin_ctlx(hfa384x_t *hw, hfa384x_usbin_t *usbin,
                               int urb_status)
{
        hfa384x_usbctlx_t *ctlx;
        int run_queue = 0;
        unsigned long flags;

retry:
        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        /* There can be only one CTLX on the active queue
         * at any one time, and this is the CTLX that the
         * timers are waiting for.
         */
        if (list_empty(&hw->ctlxq.active))
                goto unlock;

        /* Remove the "response timeout". It's possible that
         * we are already too late, and that the timeout is
         * already running. And that's just too bad for us,
         * because we could lose our CTLX from the active
         * queue here ...
         */
        if (del_timer(&hw->resptimer) == 0) {
                if (hw->resp_timer_done == 0) {
                        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                        goto retry;
                }
        } else {
                hw->resp_timer_done = 1;
        }

        ctlx = get_active_ctlx(hw);

        if (urb_status != 0) {
                /*
                 * Bad CTLX, so get rid of it. But we only
                 * remove it from the active queue if we're no
                 * longer expecting the OUT URB to complete.
                 */
                if (unlocked_usbctlx_cancel_async(hw, ctlx) == 0)
                        run_queue = 1;
        } else {
                const u16 intype = (usbin->type & ~cpu_to_le16(0x8000));

                /*
                 * Check that our message is what we're expecting ...
                 */
                if (ctlx->outbuf.type != intype) {
                        printk(KERN_WARNING
                               "Expected IN[%d], received IN[%d] - ignored.\n",
                               le16_to_cpu(ctlx->outbuf.type),
                               le16_to_cpu(intype));
                        goto unlock;
                }

                /* This URB has succeeded, so grab the data ... */
                memcpy(&ctlx->inbuf, usbin, sizeof(ctlx->inbuf));

                switch (ctlx->state) {
                case CTLX_REQ_SUBMITTED:
                        /*
                         * We have received our response URB before
                         * our request has been acknowledged. Odd,
                         * but our OUT URB is still alive...
                         */
                        pr_debug("Causality violation: please reboot Universe\n");
                        ctlx->state = CTLX_RESP_COMPLETE;
                        break;

                case CTLX_REQ_COMPLETE:
                        /*
                         * This is the usual path: our request
                         * has already been acknowledged, and
                         * now we have received the reply too.
                         */
                        ctlx->state = CTLX_COMPLETE;
                        unlocked_usbctlx_complete(hw, ctlx);
                        run_queue = 1;
                        break;

                default:
                        /*
                         * Throw this CTLX away ...
                         */
                        printk(KERN_ERR
                               "Matched IN URB, CTLX[%d] in invalid state(%s)."
                               " Discarded.\n",
                               le16_to_cpu(ctlx->outbuf.type),
                               ctlxstr(ctlx->state));
                        if (unlocked_usbctlx_cancel_async(hw, ctlx) == 0)
                                run_queue = 1;
                        break;
                }               /* switch */
        }

unlock:
        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);

        if (run_queue)
                hfa384x_usbctlxq_run(hw);
}

/*----------------------------------------------------------------
* hfa384x_usbin_txcompl
*
* At this point we have the results of a previous transmit.
*
* Arguments:
*       wlandev         wlan device
*       usbin           ptr to the usb transfer buffer
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbin_txcompl(wlandevice_t *wlandev,
                                  hfa384x_usbin_t *usbin)
{
        u16 status;

        status = le16_to_cpu(usbin->type); /* yeah I know it says type... */

        /* Was there an error? */
        if (HFA384x_TXSTATUS_ISERROR(status))
                prism2sta_ev_txexc(wlandev, status);
        else
                prism2sta_ev_tx(wlandev, status);
}

/*----------------------------------------------------------------
* hfa384x_usbin_rx
*
* At this point we have a successful received a rx frame packet.
*
* Arguments:
*       wlandev         wlan device
*       usbin           ptr to the usb transfer buffer
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbin_rx(wlandevice_t *wlandev, struct sk_buff *skb)
{
        hfa384x_usbin_t *usbin = (hfa384x_usbin_t *) skb->data;
        hfa384x_t *hw = wlandev->priv;
        int hdrlen;
        struct p80211_rxmeta *rxmeta;
        u16 data_len;
        u16 fc;

        /* Byte order convert once up front. */
        usbin->rxfrm.desc.status = le16_to_cpu(usbin->rxfrm.desc.status);
        usbin->rxfrm.desc.time = le32_to_cpu(usbin->rxfrm.desc.time);

        /* Now handle frame based on port# */
        switch (HFA384x_RXSTATUS_MACPORT_GET(usbin->rxfrm.desc.status)) {
        case 0:
                fc = le16_to_cpu(usbin->rxfrm.desc.frame_control);

                /* If exclude and we receive an unencrypted, drop it */
                if ((wlandev->hostwep & HOSTWEP_EXCLUDEUNENCRYPTED) &&
                    !WLAN_GET_FC_ISWEP(fc)) {
                        goto done;
                }

                data_len = le16_to_cpu(usbin->rxfrm.desc.data_len);

                /* How much header data do we have? */
                hdrlen = p80211_headerlen(fc);

                /* Pull off the descriptor */
                skb_pull(skb, sizeof(hfa384x_rx_frame_t));

                /* Now shunt the header block up against the data block
                 * with an "overlapping" copy
                 */
                memmove(skb_push(skb, hdrlen),
                        &usbin->rxfrm.desc.frame_control, hdrlen);

                skb->dev = wlandev->netdev;
                skb->dev->last_rx = jiffies;

                /* And set the frame length properly */
                skb_trim(skb, data_len + hdrlen);

                /* The prism2 series does not return the CRC */
                memset(skb_put(skb, WLAN_CRC_LEN), 0xff, WLAN_CRC_LEN);

                skb_reset_mac_header(skb);

                /* Attach the rxmeta, set some stuff */
                p80211skb_rxmeta_attach(wlandev, skb);
                rxmeta = P80211SKB_RXMETA(skb);
                rxmeta->mactime = usbin->rxfrm.desc.time;
                rxmeta->rxrate = usbin->rxfrm.desc.rate;
                rxmeta->signal = usbin->rxfrm.desc.signal - hw->dbmadjust;
                rxmeta->noise = usbin->rxfrm.desc.silence - hw->dbmadjust;

                prism2sta_ev_rx(wlandev, skb);

                break;

        case 7:
                if (!HFA384x_RXSTATUS_ISFCSERR(usbin->rxfrm.desc.status)) {
                        /* Copy to wlansnif skb */
                        hfa384x_int_rxmonitor(wlandev, &usbin->rxfrm);
                        dev_kfree_skb(skb);
                } else {
                        pr_debug("Received monitor frame: FCSerr set\n");
                }
                break;

        default:
                printk(KERN_WARNING "Received frame on unsupported port=%d\n",
                       HFA384x_RXSTATUS_MACPORT_GET(usbin->rxfrm.desc.status));
                goto done;
                break;
        }

done:
        return;
}

/*----------------------------------------------------------------
* hfa384x_int_rxmonitor
*
* Helper function for int_rx.  Handles monitor frames.
* Note that this function allocates space for the FCS and sets it
* to 0xffffffff.  The hfa384x doesn't give us the FCS value but the
* higher layers expect it.  0xffffffff is used as a flag to indicate
* the FCS is bogus.
*
* Arguments:
*       wlandev         wlan device structure
*       rxfrm           rx descriptor read from card in int_rx
*
* Returns:
*       nothing
*
* Side effects:
*       Allocates an skb and passes it up via the PF_PACKET interface.
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_int_rxmonitor(wlandevice_t *wlandev,
                                  hfa384x_usb_rxfrm_t *rxfrm)
{
        hfa384x_rx_frame_t *rxdesc = &(rxfrm->desc);
        unsigned int hdrlen = 0;
        unsigned int datalen = 0;
        unsigned int skblen = 0;
        u8 *datap;
        u16 fc;
        struct sk_buff *skb;
        hfa384x_t *hw = wlandev->priv;

        /* Remember the status, time, and data_len fields are in host order */
        /* Figure out how big the frame is */
        fc = le16_to_cpu(rxdesc->frame_control);
        hdrlen = p80211_headerlen(fc);
        datalen = le16_to_cpu(rxdesc->data_len);

        /* Allocate an ind message+framesize skb */
        skblen = sizeof(struct p80211_caphdr) + hdrlen + datalen + WLAN_CRC_LEN;

        /* sanity check the length */
        if (skblen >
            (sizeof(struct p80211_caphdr) +
             WLAN_HDR_A4_LEN + WLAN_DATA_MAXLEN + WLAN_CRC_LEN)) {
                pr_debug("overlen frm: len=%zd\n",
                         skblen - sizeof(struct p80211_caphdr));
        }

        skb = dev_alloc_skb(skblen);
        if (skb == NULL) {
                printk(KERN_ERR
                       "alloc_skb failed trying to allocate %d bytes\n",
                       skblen);
                return;
        }

        /* only prepend the prism header if in the right mode */
        if ((wlandev->netdev->type == ARPHRD_IEEE80211_PRISM) &&
            (hw->sniffhdr != 0)) {
                struct p80211_caphdr *caphdr;
                /* The NEW header format! */
                datap = skb_put(skb, sizeof(struct p80211_caphdr));
                caphdr = (struct p80211_caphdr *) datap;

                caphdr->version = htonl(P80211CAPTURE_VERSION);
                caphdr->length = htonl(sizeof(struct p80211_caphdr));
                caphdr->mactime = __cpu_to_be64(rxdesc->time) * 1000;
                caphdr->hosttime = __cpu_to_be64(jiffies);
                caphdr->phytype = htonl(4);     /* dss_dot11_b */
                caphdr->channel = htonl(hw->sniff_channel);
                caphdr->datarate = htonl(rxdesc->rate);
                caphdr->antenna = htonl(0);     /* unknown */
                caphdr->priority = htonl(0);    /* unknown */
                caphdr->ssi_type = htonl(3);    /* rssi_raw */
                caphdr->ssi_signal = htonl(rxdesc->signal);
                caphdr->ssi_noise = htonl(rxdesc->silence);
                caphdr->preamble = htonl(0);    /* unknown */
                caphdr->encoding = htonl(1);    /* cck */
        }

        /* Copy the 802.11 header to the skb
           (ctl frames may be less than a full header) */
        datap = skb_put(skb, hdrlen);
        memcpy(datap, &(rxdesc->frame_control), hdrlen);

        /* If any, copy the data from the card to the skb */
        if (datalen > 0) {
                datap = skb_put(skb, datalen);
                memcpy(datap, rxfrm->data, datalen);

                /* check for unencrypted stuff if WEP bit set. */
                if (*(datap - hdrlen + 1) & 0x40)       /* wep set */
                        if ((*(datap) == 0xaa) && (*(datap + 1) == 0xaa))
                                /* clear wep; it's the 802.2 header! */
                                *(datap - hdrlen + 1) &= 0xbf;
        }

        if (hw->sniff_fcs) {
                /* Set the FCS */
                datap = skb_put(skb, WLAN_CRC_LEN);
                memset(datap, 0xff, WLAN_CRC_LEN);
        }

        /* pass it back up */
        prism2sta_ev_rx(wlandev, skb);

        return;
}

/*----------------------------------------------------------------
* hfa384x_usbin_info
*
* At this point we have a successful received a Prism2 info frame.
*
* Arguments:
*       wlandev         wlan device
*       usbin           ptr to the usb transfer buffer
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbin_info(wlandevice_t *wlandev, hfa384x_usbin_t *usbin)
{
        usbin->infofrm.info.framelen =
            le16_to_cpu(usbin->infofrm.info.framelen);
        prism2sta_ev_info(wlandev, &usbin->infofrm.info);
}

/*----------------------------------------------------------------
* hfa384x_usbout_callback
*
* Callback for URBs on the BULKOUT endpoint.
*
* Arguments:
*       urb             ptr to the completed urb
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbout_callback(struct urb *urb)
{
        wlandevice_t *wlandev = urb->context;
        hfa384x_usbout_t *usbout = urb->transfer_buffer;

#ifdef DEBUG_USB
        dbprint_urb(urb);
#endif

        if (wlandev && wlandev->netdev) {

                switch (urb->status) {
                case 0:
                        hfa384x_usbout_tx(wlandev, usbout);
                        break;

                case -EPIPE:
                        {
                                hfa384x_t *hw = wlandev->priv;
                                printk(KERN_WARNING
                                       "%s tx pipe stalled: requesting reset\n",
                                       wlandev->netdev->name);
                                if (!test_and_set_bit
                                    (WORK_TX_HALT, &hw->usb_flags))
                                        schedule_work(&hw->usb_work);
                                ++(wlandev->linux_stats.tx_errors);
                                break;
                        }

                case -EPROTO:
                case -ETIMEDOUT:
                case -EILSEQ:
                        {
                                hfa384x_t *hw = wlandev->priv;

                                if (!test_and_set_bit
                                    (THROTTLE_TX, &hw->usb_flags)
                                    && !timer_pending(&hw->throttle)) {
                                        mod_timer(&hw->throttle,
                                                  jiffies + THROTTLE_JIFFIES);
                                }
                                ++(wlandev->linux_stats.tx_errors);
                                netif_stop_queue(wlandev->netdev);
                                break;
                        }

                case -ENOENT:
                case -ESHUTDOWN:
                        /* Ignorable errors */
                        break;

                default:
                        printk(KERN_INFO "unknown urb->status=%d\n",
                               urb->status);
                        ++(wlandev->linux_stats.tx_errors);
                        break;
                }               /* switch */
        }
}

/*----------------------------------------------------------------
* hfa384x_ctlxout_callback
*
* Callback for control data on the BULKOUT endpoint.
*
* Arguments:
*       urb             ptr to the completed urb
*
* Returns:
* nothing
*
* Side effects:
*
* Call context:
* interrupt
----------------------------------------------------------------*/
static void hfa384x_ctlxout_callback(struct urb *urb)
{
        hfa384x_t *hw = urb->context;
        int delete_resptimer = 0;
        int timer_ok = 1;
        int run_queue = 0;
        hfa384x_usbctlx_t *ctlx;
        unsigned long flags;

        pr_debug("urb->status=%d\n", urb->status);
#ifdef DEBUG_USB
        dbprint_urb(urb);
#endif
        if ((urb->status == -ESHUTDOWN) ||
            (urb->status == -ENODEV) || (hw == NULL))
                goto done;

retry:
        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        /*
         * Only one CTLX at a time on the "active" list, and
         * none at all if we are unplugged. However, we can
         * rely on the disconnect function to clean everything
         * up if someone unplugged the adapter.
         */
        if (list_empty(&hw->ctlxq.active)) {
                spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                goto done;
        }

        /*
         * Having something on the "active" queue means
         * that we have timers to worry about ...
         */
        if (del_timer(&hw->reqtimer) == 0) {
                if (hw->req_timer_done == 0) {
                        /*
                         * This timer was actually running while we
                         * were trying to delete it. Let it terminate
                         * gracefully instead.
                         */
                        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                        goto retry;
                }
        } else {
                hw->req_timer_done = 1;
        }

        ctlx = get_active_ctlx(hw);

        if (urb->status == 0) {
                /* Request portion of a CTLX is successful */
                switch (ctlx->state) {
                case CTLX_REQ_SUBMITTED:
                        /* This OUT-ACK received before IN */
                        ctlx->state = CTLX_REQ_COMPLETE;
                        break;

                case CTLX_RESP_COMPLETE:
                        /* IN already received before this OUT-ACK,
                         * so this command must now be complete.
                         */
                        ctlx->state = CTLX_COMPLETE;
                        unlocked_usbctlx_complete(hw, ctlx);
                        run_queue = 1;
                        break;

                default:
                        /* This is NOT a valid CTLX "success" state! */
                        printk(KERN_ERR
                                "Illegal CTLX[%d] success state(%s, %d) in OUT URB\n",
                                le16_to_cpu(ctlx->outbuf.type),
                                ctlxstr(ctlx->state), urb->status);
                        break;
                }               /* switch */
        } else {
                /* If the pipe has stalled then we need to reset it */
                if ((urb->status == -EPIPE) &&
                    !test_and_set_bit(WORK_TX_HALT, &hw->usb_flags)) {
                        printk(KERN_WARNING
                               "%s tx pipe stalled: requesting reset\n",
                               hw->wlandev->netdev->name);
                        schedule_work(&hw->usb_work);
                }

                /* If someone cancels the OUT URB then its status
                 * should be either -ECONNRESET or -ENOENT.
                 */
                ctlx->state = CTLX_REQ_FAILED;
                unlocked_usbctlx_complete(hw, ctlx);
                delete_resptimer = 1;
                run_queue = 1;
        }

delresp:
        if (delete_resptimer) {
                timer_ok = del_timer(&hw->resptimer);
                if (timer_ok != 0)
                        hw->resp_timer_done = 1;
        }

        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);

        if (!timer_ok && (hw->resp_timer_done == 0)) {
                spin_lock_irqsave(&hw->ctlxq.lock, flags);
                goto delresp;
        }

        if (run_queue)
                hfa384x_usbctlxq_run(hw);

done:
        ;
}

/*----------------------------------------------------------------
* hfa384x_usbctlx_reqtimerfn
*
* Timer response function for CTLX request timeouts.  If this
* function is called, it means that the callback for the OUT
* URB containing a Prism2.x XXX_Request was never called.
*
* Arguments:
*       data            a ptr to the hfa384x_t
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbctlx_reqtimerfn(unsigned long data)
{
        hfa384x_t *hw = (hfa384x_t *) data;
        unsigned long flags;

        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        hw->req_timer_done = 1;

        /* Removing the hardware automatically empties
         * the active list ...
         */
        if (!list_empty(&hw->ctlxq.active)) {
                /*
                 * We must ensure that our URB is removed from
                 * the system, if it hasn't already expired.
                 */
                hw->ctlx_urb.transfer_flags |= URB_ASYNC_UNLINK;
                if (usb_unlink_urb(&hw->ctlx_urb) == -EINPROGRESS) {
                        hfa384x_usbctlx_t *ctlx = get_active_ctlx(hw);

                        ctlx->state = CTLX_REQ_FAILED;

                        /* This URB was active, but has now been
                         * cancelled. It will now have a status of
                         * -ECONNRESET in the callback function.
                         *
                         * We are cancelling this CTLX, so we're
                         * not going to need to wait for a response.
                         * The URB's callback function will check
                         * that this timer is truly dead.
                         */
                        if (del_timer(&hw->resptimer) != 0)
                                hw->resp_timer_done = 1;
                }
        }

        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
}

/*----------------------------------------------------------------
* hfa384x_usbctlx_resptimerfn
*
* Timer response function for CTLX response timeouts.  If this
* function is called, it means that the callback for the IN
* URB containing a Prism2.x XXX_Response was never called.
*
* Arguments:
*       data            a ptr to the hfa384x_t
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbctlx_resptimerfn(unsigned long data)
{
        hfa384x_t *hw = (hfa384x_t *) data;
        unsigned long flags;

        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        hw->resp_timer_done = 1;

        /* The active list will be empty if the
         * adapter has been unplugged ...
         */
        if (!list_empty(&hw->ctlxq.active)) {
                hfa384x_usbctlx_t *ctlx = get_active_ctlx(hw);

                if (unlocked_usbctlx_cancel_async(hw, ctlx) == 0) {
                        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                        hfa384x_usbctlxq_run(hw);
                        goto done;
                }
        }

        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);

done:
        ;

}

/*----------------------------------------------------------------
* hfa384x_usb_throttlefn
*
*
* Arguments:
*       data    ptr to hw
*
* Returns:
*       Nothing
*
* Side effects:
*
* Call context:
*       Interrupt
----------------------------------------------------------------*/
static void hfa384x_usb_throttlefn(unsigned long data)
{
        hfa384x_t *hw = (hfa384x_t *) data;
        unsigned long flags;

        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        /*
         * We need to check BOTH the RX and the TX throttle controls,
         * so we use the bitwise OR instead of the logical OR.
         */
        pr_debug("flags=0x%lx\n", hw->usb_flags);
        if (!hw->wlandev->hwremoved &&
            ((test_and_clear_bit(THROTTLE_RX, &hw->usb_flags) &&
              !test_and_set_bit(WORK_RX_RESUME, &hw->usb_flags))
             |
             (test_and_clear_bit(THROTTLE_TX, &hw->usb_flags) &&
              !test_and_set_bit(WORK_TX_RESUME, &hw->usb_flags))
            )) {
                schedule_work(&hw->usb_work);
        }

        spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
}

/*----------------------------------------------------------------
* hfa384x_usbctlx_submit
*
* Called from the doxxx functions to submit a CTLX to the queue
*
* Arguments:
*       hw              ptr to the hw struct
*       ctlx            ctlx structure to enqueue
*
* Returns:
*       -ENODEV if the adapter is unplugged
*       0
*
* Side effects:
*
* Call context:
*       process or interrupt
----------------------------------------------------------------*/
static int hfa384x_usbctlx_submit(hfa384x_t *hw, hfa384x_usbctlx_t *ctlx)
{
        unsigned long flags;
        int ret;

        spin_lock_irqsave(&hw->ctlxq.lock, flags);

        if (hw->wlandev->hwremoved) {
                spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                ret = -ENODEV;
        } else {
                ctlx->state = CTLX_PENDING;
                list_add_tail(&ctlx->list, &hw->ctlxq.pending);

                spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
                hfa384x_usbctlxq_run(hw);
                ret = 0;
        }

        return ret;
}

/*----------------------------------------------------------------
* hfa384x_usbout_tx
*
* At this point we have finished a send of a frame.  Mark the URB
* as available and call ev_alloc to notify higher layers we're
* ready for more.
*
* Arguments:
*       wlandev         wlan device
*       usbout          ptr to the usb transfer buffer
*
* Returns:
*       nothing
*
* Side effects:
*
* Call context:
*       interrupt
----------------------------------------------------------------*/
static void hfa384x_usbout_tx(wlandevice_t *wlandev, hfa384x_usbout_t *usbout)
{
        prism2sta_ev_alloc(wlandev);
}

/*----------------------------------------------------------------
* hfa384x_isgood_pdrcore
*
* Quick check of PDR codes.
*
* Arguments:
*       pdrcode         PDR code number (host order)
*
* Returns:
*       zero            not good.
*       one             is good.
*
* Side effects:
*
* Call context:
----------------------------------------------------------------*/
static int hfa384x_isgood_pdrcode(u16 pdrcode)
{
        switch (pdrcode) {
        case HFA384x_PDR_END_OF_PDA:
        case HFA384x_PDR_PCB_PARTNUM:
        case HFA384x_PDR_PDAVER:
        case HFA384x_PDR_NIC_SERIAL:
        case HFA384x_PDR_MKK_MEASUREMENTS:
        case HFA384x_PDR_NIC_RAMSIZE:
        case HFA384x_PDR_MFISUPRANGE:
        case HFA384x_PDR_CFISUPRANGE:
        case HFA384x_PDR_NICID:
        case HFA384x_PDR_MAC_ADDRESS:
        case HFA384x_PDR_REGDOMAIN:
        case HFA384x_PDR_ALLOWED_CHANNEL:
        case HFA384x_PDR_DEFAULT_CHANNEL:
        case HFA384x_PDR_TEMPTYPE:
        case HFA384x_PDR_IFR_SETTING:
        case HFA384x_PDR_RFR_SETTING:
        case HFA384x_PDR_HFA3861_BASELINE:
        case HFA384x_PDR_HFA3861_SHADOW:
        case HFA384x_PDR_HFA3861_IFRF:
        case HFA384x_PDR_HFA3861_CHCALSP:
        case HFA384x_PDR_HFA3861_CHCALI:
        case HFA384x_PDR_3842_NIC_CONFIG:
        case HFA384x_PDR_USB_ID:
        case HFA384x_PDR_PCI_ID:
        case HFA384x_PDR_PCI_IFCONF:
        case HFA384x_PDR_PCI_PMCONF:
        case HFA384x_PDR_RFENRGY:
        case HFA384x_PDR_HFA3861_MANF_TESTSP:
        case HFA384x_PDR_HFA3861_MANF_TESTI:
                /* code is OK */
                return 1;
                break;
        default:
                if (pdrcode < 0x1000) {
                        /* code is OK, but we don't know exactly what it is */
                        pr_debug("Encountered unknown PDR#=0x%04x, "
                                 "assuming it's ok.\n", pdrcode);
                        return 1;
                } else {
                        /* bad code */
                        pr_debug("Encountered unknown PDR#=0x%04x, "
                                 "(>=0x1000), assuming it's bad.\n", pdrcode);
                        return 0;
                }
                break;
        }
        return 0;               /* avoid compiler warnings */
}