usb.c

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/*
 * Copyright (c) 2011 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/firmware.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include <net/cfg80211.h>

#include <defs.h>
#include <brcmu_utils.h>
#include <brcmu_wifi.h>
#include <dhd_bus.h>
#include <dhd_dbg.h>

#include "usb_rdl.h"
#include "usb.h"

#define IOCTL_RESP_TIMEOUT  2000

#define BRCMF_USB_SYNC_TIMEOUT      300 /* ms */
#define BRCMF_USB_DLIMAGE_SPINWAIT  100 /* in unit of ms */
#define BRCMF_USB_DLIMAGE_LIMIT     500 /* spinwait limit (ms) */

#define BRCMF_POSTBOOT_ID       0xA123  /* ID to detect if dongle
                           has boot up */
#define BRCMF_USB_RESETCFG_SPINWAIT 1   /* wait after resetcfg (ms) */

#define BRCMF_USB_NRXQ  50
#define BRCMF_USB_NTXQ  50

#define CONFIGDESC(usb)         (&((usb)->actconfig)->desc)
#define IFPTR(usb, idx)         ((usb)->actconfig->interface[(idx)])
#define IFALTS(usb, idx)        (IFPTR((usb), (idx))->altsetting[0])
#define IFDESC(usb, idx)        IFALTS((usb), (idx)).desc
#define IFEPDESC(usb, idx, ep)  (IFALTS((usb), (idx)).endpoint[(ep)]).desc

#define CONTROL_IF              0
#define BULK_IF                 0

#define BRCMF_USB_CBCTL_WRITE   0
#define BRCMF_USB_CBCTL_READ    1
#define BRCMF_USB_MAX_PKT_SIZE  1600

#define BRCMF_USB_43143_FW_NAME "brcm/brcmfmac43143.bin"
#define BRCMF_USB_43236_FW_NAME "brcm/brcmfmac43236b.bin"
#define BRCMF_USB_43242_FW_NAME "brcm/brcmfmac43242a.bin"

enum usbdev_suspend_state {
    USBOS_SUSPEND_STATE_DEVICE_ACTIVE = 0, /* Device is busy, won't allow
                          suspend */
    USBOS_SUSPEND_STATE_SUSPEND_PENDING,    /* Device is idle, can be
                         * suspended. Wating PM to
                         * suspend the device
                         */
    USBOS_SUSPEND_STATE_SUSPENDED   /* Device suspended */
};

struct brcmf_usb_image {
    struct list_head list;
    s8 *fwname;
    u8 *image;
    int image_len;
};
static struct list_head fw_image_list;

struct intr_transfer_buf {
    u32 notification;
    u32 reserved;
};

struct brcmf_usbdev_info {
    struct brcmf_usbdev bus_pub; /* MUST BE FIRST */
    spinlock_t qlock;
    struct list_head rx_freeq;
    struct list_head rx_postq;
    struct list_head tx_freeq;
    struct list_head tx_postq;
    enum usbdev_suspend_state suspend_state;
    uint rx_pipe, tx_pipe, intr_pipe, rx_pipe2;

    bool activity;
    int rx_low_watermark;
    int tx_low_watermark;
    int tx_high_watermark;
    int tx_freecount;
    bool tx_flowblock;

    struct brcmf_usbreq *tx_reqs;
    struct brcmf_usbreq *rx_reqs;

    u8 *image;  /* buffer for combine fw and nvram */
    int image_len;

    wait_queue_head_t wait;
    bool waitdone;
    int sync_urb_status;

    struct usb_device *usbdev;
    struct device *dev;

    int ctl_in_pipe, ctl_out_pipe;
    struct urb *ctl_urb; /* URB for control endpoint */
    struct usb_ctrlrequest ctl_write;
    struct usb_ctrlrequest ctl_read;
    u32 ctl_urb_actual_length;
    int ctl_urb_status;
    int ctl_completed;
    wait_queue_head_t ioctl_resp_wait;
    wait_queue_head_t ctrl_wait;
    ulong ctl_op;

    struct urb *bulk_urb; /* used for FW download */
    struct urb *intr_urb; /* URB for interrupt endpoint */
    int intr_size;          /* Size of interrupt message */
    int interval;           /* Interrupt polling interval */
    struct intr_transfer_buf intr; /* Data buffer for interrupt endpoint */
};

static void brcmf_usb_rx_refill(struct brcmf_usbdev_info *devinfo,
                struct brcmf_usbreq  *req);

MODULE_AUTHOR("Broadcom Corporation");
MODULE_DESCRIPTION("Broadcom 802.11n wireless LAN fullmac usb driver.");
MODULE_SUPPORTED_DEVICE("Broadcom 802.11n WLAN fullmac usb cards");
MODULE_LICENSE("Dual BSD/GPL");

static struct brcmf_usbdev *brcmf_usb_get_buspub(struct device *dev)
{
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    return bus_if->bus_priv.usb;
}

static struct brcmf_usbdev_info *brcmf_usb_get_businfo(struct device *dev)
{
    return brcmf_usb_get_buspub(dev)->devinfo;
}

static int brcmf_usb_ioctl_resp_wait(struct brcmf_usbdev_info *devinfo)
{
    return wait_event_timeout(devinfo->ioctl_resp_wait,
                  devinfo->ctl_completed,
                  msecs_to_jiffies(IOCTL_RESP_TIMEOUT));
}

static void brcmf_usb_ioctl_resp_wake(struct brcmf_usbdev_info *devinfo)
{
    if (waitqueue_active(&devinfo->ioctl_resp_wait))
        wake_up(&devinfo->ioctl_resp_wait);
}

static void
brcmf_usb_ctl_complete(struct brcmf_usbdev_info *devinfo, int type, int status)
{

    if (unlikely(devinfo == NULL))
        return;

    if (type == BRCMF_USB_CBCTL_READ) {
        if (status == 0)
            devinfo->bus_pub.stats.rx_ctlpkts++;
        else
            devinfo->bus_pub.stats.rx_ctlerrs++;
    } else if (type == BRCMF_USB_CBCTL_WRITE) {
        if (status == 0)
            devinfo->bus_pub.stats.tx_ctlpkts++;
        else
            devinfo->bus_pub.stats.tx_ctlerrs++;
    }

    devinfo->ctl_urb_status = status;
    devinfo->ctl_completed = true;
    brcmf_usb_ioctl_resp_wake(devinfo);
}

static void
brcmf_usb_ctlread_complete(struct urb *urb)
{
    struct brcmf_usbdev_info *devinfo =
        (struct brcmf_usbdev_info *)urb->context;

    devinfo->ctl_urb_actual_length = urb->actual_length;
    brcmf_usb_ctl_complete(devinfo, BRCMF_USB_CBCTL_READ,
        urb->status);
}

static void
brcmf_usb_ctlwrite_complete(struct urb *urb)
{
    struct brcmf_usbdev_info *devinfo =
        (struct brcmf_usbdev_info *)urb->context;

    brcmf_usb_ctl_complete(devinfo, BRCMF_USB_CBCTL_WRITE,
        urb->status);
}

static int brcmf_usb_pnp(struct brcmf_usbdev_info *devinfo, uint state)
{
    return 0;
}

static int
brcmf_usb_send_ctl(struct brcmf_usbdev_info *devinfo, u8 *buf, int len)
{
    int ret;
    u16 size;

    if (devinfo == NULL || buf == NULL ||
        len == 0 || devinfo->ctl_urb == NULL)
        return -EINVAL;

    /* If the USB/HSIC bus in sleep state, wake it up */
    if (devinfo->suspend_state == USBOS_SUSPEND_STATE_SUSPENDED)
        if (brcmf_usb_pnp(devinfo, BCMFMAC_USB_PNP_RESUME) != 0) {
            brcmf_dbg(ERROR, "Could not Resume the bus!\n");
            return -EIO;
        }

    devinfo->activity = true;
    size = len;
    devinfo->ctl_write.wLength = cpu_to_le16p(&size);
    devinfo->ctl_urb->transfer_buffer_length = size;
    devinfo->ctl_urb_status = 0;
    devinfo->ctl_urb_actual_length = 0;

    usb_fill_control_urb(devinfo->ctl_urb,
        devinfo->usbdev,
        devinfo->ctl_out_pipe,
        (unsigned char *) &devinfo->ctl_write,
        buf, size,
        (usb_complete_t)brcmf_usb_ctlwrite_complete,
        devinfo);

    ret = usb_submit_urb(devinfo->ctl_urb, GFP_ATOMIC);
    if (ret < 0)
        brcmf_dbg(ERROR, "usb_submit_urb failed %d\n", ret);

    return ret;
}

static int
brcmf_usb_recv_ctl(struct brcmf_usbdev_info *devinfo, u8 *buf, int len)
{
    int ret;
    u16 size;

    if ((devinfo == NULL) || (buf == NULL) || (len == 0)
        || (devinfo->ctl_urb == NULL))
        return -EINVAL;

    size = len;
    devinfo->ctl_read.wLength = cpu_to_le16p(&size);
    devinfo->ctl_urb->transfer_buffer_length = size;

    devinfo->ctl_read.bRequestType = USB_DIR_IN
        | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
    devinfo->ctl_read.bRequest = 1;

    usb_fill_control_urb(devinfo->ctl_urb,
        devinfo->usbdev,
        devinfo->ctl_in_pipe,
        (unsigned char *) &devinfo->ctl_read,
        buf, size,
        (usb_complete_t)brcmf_usb_ctlread_complete,
        devinfo);

    ret = usb_submit_urb(devinfo->ctl_urb, GFP_ATOMIC);
    if (ret < 0)
        brcmf_dbg(ERROR, "usb_submit_urb failed %d\n", ret);

    return ret;
}

static int brcmf_usb_tx_ctlpkt(struct device *dev, u8 *buf, u32 len)
{
    int err = 0;
    int timeout = 0;
    struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);

    if (devinfo->bus_pub.state != BCMFMAC_USB_STATE_UP) {
        /* TODO: handle suspend/resume */
        return -EIO;
    }

    if (test_and_set_bit(0, &devinfo->ctl_op))
        return -EIO;

    devinfo->ctl_completed = false;
    err = brcmf_usb_send_ctl(devinfo, buf, len);
    if (err) {
        brcmf_dbg(ERROR, "fail %d bytes: %d\n", err, len);
        clear_bit(0, &devinfo->ctl_op);
        return err;
    }
    timeout = brcmf_usb_ioctl_resp_wait(devinfo);
    clear_bit(0, &devinfo->ctl_op);
    if (!timeout) {
        brcmf_dbg(ERROR, "Txctl wait timed out\n");
        err = -EIO;
    }
    return err;
}

static int brcmf_usb_rx_ctlpkt(struct device *dev, u8 *buf, u32 len)
{
    int err = 0;
    int timeout = 0;
    struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);

    if (devinfo->bus_pub.state != BCMFMAC_USB_STATE_UP) {
        /* TODO: handle suspend/resume */
        return -EIO;
    }
    if (test_and_set_bit(0, &devinfo->ctl_op))
        return -EIO;

    devinfo->ctl_completed = false;
    err = brcmf_usb_recv_ctl(devinfo, buf, len);
    if (err) {
        brcmf_dbg(ERROR, "fail %d bytes: %d\n", err, len);
        clear_bit(0, &devinfo->ctl_op);
        return err;
    }
    timeout = brcmf_usb_ioctl_resp_wait(devinfo);
    err = devinfo->ctl_urb_status;
    clear_bit(0, &devinfo->ctl_op);
    if (!timeout) {
        brcmf_dbg(ERROR, "rxctl wait timed out\n");
        err = -EIO;
    }
    if (!err)
        return devinfo->ctl_urb_actual_length;
    else
        return err;
}

static struct brcmf_usbreq *brcmf_usb_deq(struct brcmf_usbdev_info *devinfo,
                      struct list_head *q, int *counter)
{
    unsigned long flags;
    struct brcmf_usbreq  *req;
    spin_lock_irqsave(&devinfo->qlock, flags);
    if (list_empty(q)) {
        spin_unlock_irqrestore(&devinfo->qlock, flags);
        return NULL;
    }
    req = list_entry(q->next, struct brcmf_usbreq, list);
    list_del_init(q->next);
    if (counter)
        (*counter)--;
    spin_unlock_irqrestore(&devinfo->qlock, flags);
    return req;

}

static void brcmf_usb_enq(struct brcmf_usbdev_info *devinfo,
              struct list_head *q, struct brcmf_usbreq *req,
              int *counter)
{
    unsigned long flags;
    spin_lock_irqsave(&devinfo->qlock, flags);
    list_add_tail(&req->list, q);
    if (counter)
        (*counter)++;
    spin_unlock_irqrestore(&devinfo->qlock, flags);
}

static struct brcmf_usbreq *
brcmf_usbdev_qinit(struct list_head *q, int qsize)
{
    int i;
    struct brcmf_usbreq *req, *reqs;

    reqs = kzalloc(sizeof(struct brcmf_usbreq) * qsize, GFP_ATOMIC);
    if (reqs == NULL) {
        brcmf_dbg(ERROR, "fail to allocate memory!\n");
        return NULL;
    }
    req = reqs;

    for (i = 0; i < qsize; i++) {
        req->urb = usb_alloc_urb(0, GFP_ATOMIC);
        if (!req->urb)
            goto fail;

        INIT_LIST_HEAD(&req->list);
        list_add_tail(&req->list, q);
        req++;
    }
    return reqs;
fail:
    brcmf_dbg(ERROR, "fail!\n");
    while (!list_empty(q)) {
        req = list_entry(q->next, struct brcmf_usbreq, list);
        if (req && req->urb)
            usb_free_urb(req->urb);
        list_del(q->next);
    }
    return NULL;

}

static void brcmf_usb_free_q(struct list_head *q, bool pending)
{
    struct brcmf_usbreq *req, *next;
    int i = 0;
    list_for_each_entry_safe(req, next, q, list) {
        if (!req->urb) {
            brcmf_dbg(ERROR, "bad req\n");
            break;
        }
        i++;
        if (pending) {
            usb_kill_urb(req->urb);
        } else {
            usb_free_urb(req->urb);
            list_del_init(&req->list);
        }
    }
}

static void brcmf_usb_del_fromq(struct brcmf_usbdev_info *devinfo,
                struct brcmf_usbreq *req)
{
    unsigned long flags;

    spin_lock_irqsave(&devinfo->qlock, flags);
    list_del_init(&req->list);
    spin_unlock_irqrestore(&devinfo->qlock, flags);
}


static void brcmf_usb_tx_complete(struct urb *urb)
{
    struct brcmf_usbreq *req = (struct brcmf_usbreq *)urb->context;
    struct brcmf_usbdev_info *devinfo = req->devinfo;

    brcmf_usb_del_fromq(devinfo, req);
    if (urb->status == 0)
        devinfo->bus_pub.bus->dstats.tx_packets++;
    else
        devinfo->bus_pub.bus->dstats.tx_errors++;

    brcmf_txcomplete(devinfo->dev, req->skb, urb->status == 0);

    brcmu_pkt_buf_free_skb(req->skb);
    req->skb = NULL;
    brcmf_usb_enq(devinfo, &devinfo->tx_freeq, req, &devinfo->tx_freecount);
    if (devinfo->tx_freecount > devinfo->tx_high_watermark &&
        devinfo->tx_flowblock) {
        brcmf_txflowblock(devinfo->dev, false);
        devinfo->tx_flowblock = false;
    }
}

static void brcmf_usb_rx_complete(struct urb *urb)
{
    struct brcmf_usbreq  *req = (struct brcmf_usbreq *)urb->context;
    struct brcmf_usbdev_info *devinfo = req->devinfo;
    struct sk_buff *skb;
    int ifidx = 0;

    brcmf_usb_del_fromq(devinfo, req);
    skb = req->skb;
    req->skb = NULL;

    if (urb->status == 0) {
        devinfo->bus_pub.bus->dstats.rx_packets++;
    } else {
        devinfo->bus_pub.bus->dstats.rx_errors++;
        brcmu_pkt_buf_free_skb(skb);
        brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req, NULL);
        return;
    }

    if (devinfo->bus_pub.state == BCMFMAC_USB_STATE_UP) {
        skb_put(skb, urb->actual_length);
        if (brcmf_proto_hdrpull(devinfo->dev, &ifidx, skb) != 0) {
            brcmf_dbg(ERROR, "rx protocol error\n");
            brcmu_pkt_buf_free_skb(skb);
            devinfo->bus_pub.bus->dstats.rx_errors++;
        } else
            brcmf_rx_packet(devinfo->dev, ifidx, skb);
        brcmf_usb_rx_refill(devinfo, req);
    } else {
        brcmu_pkt_buf_free_skb(skb);
        brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req, NULL);
    }
    return;

}

static void brcmf_usb_rx_refill(struct brcmf_usbdev_info *devinfo,
                struct brcmf_usbreq  *req)
{
    struct sk_buff *skb;
    int ret;

    if (!req || !devinfo)
        return;

    skb = dev_alloc_skb(devinfo->bus_pub.bus_mtu);
    if (!skb) {
        brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req, NULL);
        return;
    }
    req->skb = skb;

    usb_fill_bulk_urb(req->urb, devinfo->usbdev, devinfo->rx_pipe,
              skb->data, skb_tailroom(skb), brcmf_usb_rx_complete,
              req);
    req->devinfo = devinfo;
    brcmf_usb_enq(devinfo, &devinfo->rx_postq, req, NULL);

    ret = usb_submit_urb(req->urb, GFP_ATOMIC);
    if (ret) {
        brcmf_usb_del_fromq(devinfo, req);
        brcmu_pkt_buf_free_skb(req->skb);
        req->skb = NULL;
        brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req, NULL);
    }
    return;
}

static void brcmf_usb_rx_fill_all(struct brcmf_usbdev_info *devinfo)
{
    struct brcmf_usbreq *req;

    if (devinfo->bus_pub.state != BCMFMAC_USB_STATE_UP) {
        brcmf_dbg(ERROR, "bus is not up\n");
        return;
    }
    while ((req = brcmf_usb_deq(devinfo, &devinfo->rx_freeq, NULL)) != NULL)
        brcmf_usb_rx_refill(devinfo, req);
}

static void
brcmf_usb_state_change(struct brcmf_usbdev_info *devinfo, int state)
{
    struct brcmf_bus *bcmf_bus = devinfo->bus_pub.bus;
    int old_state;


    if (devinfo->bus_pub.state == state)
        return;

    old_state = devinfo->bus_pub.state;
    brcmf_dbg(TRACE, "dbus state change from %d to to %d\n",
          old_state, state);

    /* Don't update state if it's PnP firmware re-download */
    if (state != BCMFMAC_USB_STATE_PNP_FWDL) /* TODO */
        devinfo->bus_pub.state = state;

    if ((old_state  == BCMFMAC_USB_STATE_SLEEP)
        && (state == BCMFMAC_USB_STATE_UP)) {
        brcmf_usb_rx_fill_all(devinfo);
    }

    /* update state of upper layer */
    if (state == BCMFMAC_USB_STATE_DOWN) {
        brcmf_dbg(INFO, "DBUS is down\n");
        bcmf_bus->state = BRCMF_BUS_DOWN;
    } else {
        brcmf_dbg(INFO, "DBUS current state=%d\n", state);
    }
}

static void
brcmf_usb_intr_complete(struct urb *urb)
{
    struct brcmf_usbdev_info *devinfo =
            (struct brcmf_usbdev_info *)urb->context;
    bool killed;

    if (devinfo == NULL)
        return;

    if (unlikely(urb->status)) {
        if (devinfo->suspend_state ==
            USBOS_SUSPEND_STATE_SUSPEND_PENDING)
            killed = true;

        if ((urb->status == -ENOENT && (!killed))
            || urb->status == -ESHUTDOWN ||
            urb->status == -ENODEV) {
            brcmf_usb_state_change(devinfo, BCMFMAC_USB_STATE_DOWN);
        }
    }

    if (devinfo->bus_pub.state == BCMFMAC_USB_STATE_DOWN) {
        brcmf_dbg(ERROR, "intr cb when DBUS down, ignoring\n");
        return;
    }

    if (devinfo->bus_pub.state == BCMFMAC_USB_STATE_UP)
        usb_submit_urb(devinfo->intr_urb, GFP_ATOMIC);
}

static int brcmf_usb_tx(struct device *dev, struct sk_buff *skb)
{
    struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);
    struct brcmf_usbreq  *req;
    int ret;

    if (devinfo->bus_pub.state != BCMFMAC_USB_STATE_UP) {
        /* TODO: handle suspend/resume */
        return -EIO;
    }

    req = brcmf_usb_deq(devinfo, &devinfo->tx_freeq,
                    &devinfo->tx_freecount);
    if (!req) {
        brcmu_pkt_buf_free_skb(skb);
        brcmf_dbg(ERROR, "no req to send\n");
        return -ENOMEM;
    }

    req->skb = skb;
    req->devinfo = devinfo;
    usb_fill_bulk_urb(req->urb, devinfo->usbdev, devinfo->tx_pipe,
              skb->data, skb->len, brcmf_usb_tx_complete, req);
    req->urb->transfer_flags |= URB_ZERO_PACKET;
    brcmf_usb_enq(devinfo, &devinfo->tx_postq, req, NULL);
    ret = usb_submit_urb(req->urb, GFP_ATOMIC);
    if (ret) {
        brcmf_dbg(ERROR, "brcmf_usb_tx usb_submit_urb FAILED\n");
        brcmf_usb_del_fromq(devinfo, req);
        brcmu_pkt_buf_free_skb(req->skb);
        req->skb = NULL;
        brcmf_usb_enq(devinfo, &devinfo->tx_freeq, req,
                        &devinfo->tx_freecount);
    } else {
        if (devinfo->tx_freecount < devinfo->tx_low_watermark &&
            !devinfo->tx_flowblock) {
            brcmf_txflowblock(dev, true);
            devinfo->tx_flowblock = true;
        }
    }

    return ret;
}


static int brcmf_usb_up(struct device *dev)
{
    struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);
    u16 ifnum;

    if (devinfo->bus_pub.state == BCMFMAC_USB_STATE_UP)
        return 0;

    /* If the USB/HSIC bus in sleep state, wake it up */
    if (devinfo->suspend_state == USBOS_SUSPEND_STATE_SUSPENDED) {
        if (brcmf_usb_pnp(devinfo, BCMFMAC_USB_PNP_RESUME) != 0) {
            brcmf_dbg(ERROR, "Could not Resume the bus!\n");
            return -EIO;
        }
    }
    devinfo->activity = true;

    /* Success, indicate devinfo is fully up */
    brcmf_usb_state_change(devinfo, BCMFMAC_USB_STATE_UP);

    if (devinfo->intr_urb) {
        int ret;

        usb_fill_int_urb(devinfo->intr_urb, devinfo->usbdev,
            devinfo->intr_pipe,
            &devinfo->intr,
            devinfo->intr_size,
            (usb_complete_t)brcmf_usb_intr_complete,
            devinfo,
            devinfo->interval);

        ret = usb_submit_urb(devinfo->intr_urb, GFP_ATOMIC);
        if (ret) {
            brcmf_dbg(ERROR, "USB_SUBMIT_URB failed with status %d\n",
                  ret);
            return -EINVAL;
        }
    }

    if (devinfo->ctl_urb) {
        devinfo->ctl_in_pipe = usb_rcvctrlpipe(devinfo->usbdev, 0);
        devinfo->ctl_out_pipe = usb_sndctrlpipe(devinfo->usbdev, 0);

        ifnum = IFDESC(devinfo->usbdev, CONTROL_IF).bInterfaceNumber;

        /* CTL Write */
        devinfo->ctl_write.bRequestType =
            USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
        devinfo->ctl_write.bRequest = 0;
        devinfo->ctl_write.wValue = cpu_to_le16(0);
        devinfo->ctl_write.wIndex = cpu_to_le16p(&ifnum);

        /* CTL Read */
        devinfo->ctl_read.bRequestType =
            USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
        devinfo->ctl_read.bRequest = 1;
        devinfo->ctl_read.wValue = cpu_to_le16(0);
        devinfo->ctl_read.wIndex = cpu_to_le16p(&ifnum);
    }
    brcmf_usb_rx_fill_all(devinfo);
    return 0;
}

static void brcmf_usb_down(struct device *dev)
{
    struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);

    if (devinfo == NULL)
        return;

    brcmf_dbg(TRACE, "enter\n");
    if (devinfo->bus_pub.state == BCMFMAC_USB_STATE_DOWN)
        return;

    brcmf_usb_state_change(devinfo, BCMFMAC_USB_STATE_DOWN);
    if (devinfo->intr_urb)
        usb_kill_urb(devinfo->intr_urb);

    if (devinfo->ctl_urb)
        usb_kill_urb(devinfo->ctl_urb);

    if (devinfo->bulk_urb)
        usb_kill_urb(devinfo->bulk_urb);
    brcmf_usb_free_q(&devinfo->tx_postq, true);

    brcmf_usb_free_q(&devinfo->rx_postq, true);
}

static int
brcmf_usb_sync_wait(struct brcmf_usbdev_info *devinfo, u16 time)
{
    int ret;
    int err = 0;
    int ms = time;

    ret = wait_event_interruptible_timeout(devinfo->wait,
        devinfo->waitdone == true, (ms * HZ / 1000));

    if ((devinfo->waitdone == false) || (devinfo->sync_urb_status)) {
        brcmf_dbg(ERROR, "timeout(%d) or urb err=%d\n",
              ret, devinfo->sync_urb_status);
        err = -EINVAL;
    }
    devinfo->waitdone = false;
    return err;
}

static void
brcmf_usb_sync_complete(struct urb *urb)
{
    struct brcmf_usbdev_info *devinfo =
            (struct brcmf_usbdev_info *)urb->context;

    devinfo->waitdone = true;
    wake_up_interruptible(&devinfo->wait);
    devinfo->sync_urb_status = urb->status;
}

static bool brcmf_usb_dl_cmd(struct brcmf_usbdev_info *devinfo, u8 cmd,
                 void *buffer, int buflen)
{
    int ret = 0;
    char *tmpbuf;
    u16 size;

    if ((!devinfo) || (devinfo->ctl_urb == NULL))
        return false;

    tmpbuf = kmalloc(buflen, GFP_ATOMIC);
    if (!tmpbuf)
        return false;

    size = buflen;
    devinfo->ctl_urb->transfer_buffer_length = size;

    devinfo->ctl_read.wLength = cpu_to_le16p(&size);
    devinfo->ctl_read.bRequestType = USB_DIR_IN | USB_TYPE_VENDOR |
        USB_RECIP_INTERFACE;
    devinfo->ctl_read.bRequest = cmd;

    usb_fill_control_urb(devinfo->ctl_urb,
        devinfo->usbdev,
        usb_rcvctrlpipe(devinfo->usbdev, 0),
        (unsigned char *) &devinfo->ctl_read,
        (void *) tmpbuf, size,
        (usb_complete_t)brcmf_usb_sync_complete, devinfo);

    ret = usb_submit_urb(devinfo->ctl_urb, GFP_ATOMIC);
    if (ret < 0) {
        brcmf_dbg(ERROR, "usb_submit_urb failed %d\n", ret);
        kfree(tmpbuf);
        return false;
    }

    ret = brcmf_usb_sync_wait(devinfo, BRCMF_USB_SYNC_TIMEOUT);
    memcpy(buffer, tmpbuf, buflen);
    kfree(tmpbuf);

    return (ret == 0);
}

static bool
brcmf_usb_dlneeded(struct brcmf_usbdev_info *devinfo)
{
    struct bootrom_id_le id;
    u32 chipid, chiprev;

    brcmf_dbg(TRACE, "enter\n");

    if (devinfo == NULL)
        return false;

    /* Check if firmware downloaded already by querying runtime ID */
    id.chip = cpu_to_le32(0xDEAD);
    brcmf_usb_dl_cmd(devinfo, DL_GETVER, &id,
        sizeof(struct bootrom_id_le));

    chipid = le32_to_cpu(id.chip);
    chiprev = le32_to_cpu(id.chiprev);

    if ((chipid & 0x4300) == 0x4300)
        brcmf_dbg(INFO, "chip %x rev 0x%x\n", chipid, chiprev);
    else
        brcmf_dbg(INFO, "chip %d rev 0x%x\n", chipid, chiprev);
    if (chipid == BRCMF_POSTBOOT_ID) {
        brcmf_dbg(INFO, "firmware already downloaded\n");
        brcmf_usb_dl_cmd(devinfo, DL_RESETCFG, &id,
            sizeof(struct bootrom_id_le));
        return false;
    } else {
        devinfo->bus_pub.devid = chipid;
        devinfo->bus_pub.chiprev = chiprev;
    }
    return true;
}

static int
brcmf_usb_resetcfg(struct brcmf_usbdev_info *devinfo)
{
    struct bootrom_id_le id;
    u16 wait = 0, wait_time;

    brcmf_dbg(TRACE, "enter\n");

    if (devinfo == NULL)
        return -EINVAL;

    /* Give dongle chance to boot */
    wait_time = BRCMF_USB_DLIMAGE_SPINWAIT;
    while (wait < BRCMF_USB_DLIMAGE_LIMIT) {
        mdelay(wait_time);
        wait += wait_time;
        id.chip = cpu_to_le32(0xDEAD);       /* Get the ID */
        brcmf_usb_dl_cmd(devinfo, DL_GETVER, &id,
            sizeof(struct bootrom_id_le));
        if (id.chip == cpu_to_le32(BRCMF_POSTBOOT_ID))
            break;
    }

    if (id.chip == cpu_to_le32(BRCMF_POSTBOOT_ID)) {
        brcmf_dbg(INFO, "download done %d ms postboot chip 0x%x/rev 0x%x\n",
              wait, le32_to_cpu(id.chip), le32_to_cpu(id.chiprev));

        brcmf_usb_dl_cmd(devinfo, DL_RESETCFG, &id,
            sizeof(struct bootrom_id_le));

        /* XXX this wait may not be necessary */
        mdelay(BRCMF_USB_RESETCFG_SPINWAIT);
        return 0;
    } else {
        brcmf_dbg(ERROR, "Cannot talk to Dongle. Firmware is not UP, %d ms\n",
              wait);
        return -EINVAL;
    }
}


static int
brcmf_usb_dl_send_bulk(struct brcmf_usbdev_info *devinfo, void *buffer, int len)
{
    int ret;

    if ((devinfo == NULL) || (devinfo->bulk_urb == NULL))
        return -EINVAL;

    /* Prepare the URB */
    usb_fill_bulk_urb(devinfo->bulk_urb, devinfo->usbdev,
              devinfo->tx_pipe, buffer, len,
              (usb_complete_t)brcmf_usb_sync_complete, devinfo);

    devinfo->bulk_urb->transfer_flags |= URB_ZERO_PACKET;

    ret = usb_submit_urb(devinfo->bulk_urb, GFP_ATOMIC);
    if (ret) {
        brcmf_dbg(ERROR, "usb_submit_urb failed %d\n", ret);
        return ret;
    }
    ret = brcmf_usb_sync_wait(devinfo, BRCMF_USB_SYNC_TIMEOUT);
    return ret;
}

static int
brcmf_usb_dl_writeimage(struct brcmf_usbdev_info *devinfo, u8 *fw, int fwlen)
{
    unsigned int sendlen, sent, dllen;
    char *bulkchunk = NULL, *dlpos;
    struct rdl_state_le state;
    u32 rdlstate, rdlbytes;
    int err = 0;
    brcmf_dbg(TRACE, "fw %p, len %d\n", fw, fwlen);

    bulkchunk = kmalloc(RDL_CHUNK, GFP_ATOMIC);
    if (bulkchunk == NULL) {
        err = -ENOMEM;
        goto fail;
    }

    /* 1) Prepare USB boot loader for runtime image */
    brcmf_usb_dl_cmd(devinfo, DL_START, &state,
             sizeof(struct rdl_state_le));

    rdlstate = le32_to_cpu(state.state);
    rdlbytes = le32_to_cpu(state.bytes);

    /* 2) Check we are in the Waiting state */
    if (rdlstate != DL_WAITING) {
        brcmf_dbg(ERROR, "Failed to DL_START\n");
        err = -EINVAL;
        goto fail;
    }
    sent = 0;
    dlpos = fw;
    dllen = fwlen;

    /* Get chip id and rev */
    while (rdlbytes != dllen) {
        /* Wait until the usb device reports it received all
         * the bytes we sent */
        if ((rdlbytes == sent) && (rdlbytes != dllen)) {
            if ((dllen-sent) < RDL_CHUNK)
                sendlen = dllen-sent;
            else
                sendlen = RDL_CHUNK;

            /* simply avoid having to send a ZLP by ensuring we
             * never have an even
             * multiple of 64
             */
            if (!(sendlen % 64))
                sendlen -= 4;

            /* send data */
            memcpy(bulkchunk, dlpos, sendlen);
            if (brcmf_usb_dl_send_bulk(devinfo, bulkchunk,
                           sendlen)) {
                brcmf_dbg(ERROR, "send_bulk failed\n");
                err = -EINVAL;
                goto fail;
            }

            dlpos += sendlen;
            sent += sendlen;
        }
        if (!brcmf_usb_dl_cmd(devinfo, DL_GETSTATE, &state,
                      sizeof(struct rdl_state_le))) {
            brcmf_dbg(ERROR, "DL_GETSTATE Failed xxxx\n");
            err = -EINVAL;
            goto fail;
        }

        rdlstate = le32_to_cpu(state.state);
        rdlbytes = le32_to_cpu(state.bytes);

        /* restart if an error is reported */
        if (rdlstate == DL_BAD_HDR || rdlstate == DL_BAD_CRC) {
            brcmf_dbg(ERROR, "Bad Hdr or Bad CRC state %d\n",
                  rdlstate);
            err = -EINVAL;
            goto fail;
        }
    }

fail:
    kfree(bulkchunk);
    brcmf_dbg(TRACE, "err=%d\n", err);
    return err;
}

static int brcmf_usb_dlstart(struct brcmf_usbdev_info *devinfo, u8 *fw, int len)
{
    int err;

    brcmf_dbg(TRACE, "enter\n");

    if (devinfo == NULL)
        return -EINVAL;

    if (devinfo->bus_pub.devid == 0xDEAD)
        return -EINVAL;

    err = brcmf_usb_dl_writeimage(devinfo, fw, len);
    if (err == 0)
        devinfo->bus_pub.state = BCMFMAC_USB_STATE_DL_DONE;
    else
        devinfo->bus_pub.state = BCMFMAC_USB_STATE_DL_PENDING;
    brcmf_dbg(TRACE, "exit: err=%d\n", err);

    return err;
}

static int brcmf_usb_dlrun(struct brcmf_usbdev_info *devinfo)
{
    struct rdl_state_le state;

    brcmf_dbg(TRACE, "enter\n");
    if (!devinfo)
        return -EINVAL;

    if (devinfo->bus_pub.devid == 0xDEAD)
        return -EINVAL;

    /* Check we are runnable */
    brcmf_usb_dl_cmd(devinfo, DL_GETSTATE, &state,
        sizeof(struct rdl_state_le));

    /* Start the image */
    if (state.state == cpu_to_le32(DL_RUNNABLE)) {
        if (!brcmf_usb_dl_cmd(devinfo, DL_GO, &state,
            sizeof(struct rdl_state_le)))
            return -ENODEV;
        if (brcmf_usb_resetcfg(devinfo))
            return -ENODEV;
        /* The Dongle may go for re-enumeration. */
    } else {
        brcmf_dbg(ERROR, "Dongle not runnable\n");
        return -EINVAL;
    }
    brcmf_dbg(TRACE, "exit\n");
    return 0;
}

static bool brcmf_usb_chip_support(int chipid, int chiprev)
{
    switch(chipid) {
    case 43143:
        return true;
    case 43235:
    case 43236:
    case 43238:
        return (chiprev == 3);
    case 43242:
        return true;
    default:
        break;
    }
    return false;
}

static int
brcmf_usb_fw_download(struct brcmf_usbdev_info *devinfo)
{
    int devid, chiprev;
    int err;

    brcmf_dbg(TRACE, "enter\n");
    if (devinfo == NULL)
        return -ENODEV;

    devid = devinfo->bus_pub.devid;
    chiprev = devinfo->bus_pub.chiprev;

    if (!brcmf_usb_chip_support(devid, chiprev)) {
        brcmf_dbg(ERROR, "unsupported chip %d rev %d\n",
              devid, chiprev);
        return -EINVAL;
    }

    if (!devinfo->image) {
        brcmf_dbg(ERROR, "No firmware!\n");
        return -ENOENT;
    }

    err = brcmf_usb_dlstart(devinfo,
        devinfo->image, devinfo->image_len);
    if (err == 0)
        err = brcmf_usb_dlrun(devinfo);
    return err;
}


static void brcmf_usb_detach(struct brcmf_usbdev_info *devinfo)
{
    brcmf_dbg(TRACE, "devinfo %p\n", devinfo);

    /* free the URBS */
    brcmf_usb_free_q(&devinfo->rx_freeq, false);
    brcmf_usb_free_q(&devinfo->tx_freeq, false);

    usb_free_urb(devinfo->intr_urb);
    usb_free_urb(devinfo->ctl_urb);
    usb_free_urb(devinfo->bulk_urb);

    kfree(devinfo->tx_reqs);
    kfree(devinfo->rx_reqs);
}

#define TRX_MAGIC       0x30524448      /* "HDR0" */
#define TRX_VERSION     1               /* Version 1 */
#define TRX_MAX_LEN     0x3B0000        /* Max length */
#define TRX_NO_HEADER   1               /* Do not write TRX header */
#define TRX_MAX_OFFSET  3               /* Max number of individual files */
#define TRX_UNCOMP_IMAGE        0x20    /* Trx contains uncompressed image */

struct trx_header_le {
    __le32 magic;       /* "HDR0" */
    __le32 len;     /* Length of file including header */
    __le32 crc32;       /* CRC from flag_version to end of file */
    __le32 flag_version;    /* 0:15 flags, 16:31 version */
    __le32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of
                     * header */
};

static int check_file(const u8 *headers)
{
    struct trx_header_le *trx;
    int actual_len = -1;

    /* Extract trx header */
    trx = (struct trx_header_le *) headers;
    if (trx->magic != cpu_to_le32(TRX_MAGIC))
        return -1;

    headers += sizeof(struct trx_header_le);

    if (le32_to_cpu(trx->flag_version) & TRX_UNCOMP_IMAGE) {
        actual_len = le32_to_cpu(trx->offsets[TRX_OFFSETS_DLFWLEN_IDX]);
        return actual_len + sizeof(struct trx_header_le);
    }
    return -1;
}

static int brcmf_usb_get_fw(struct brcmf_usbdev_info *devinfo)
{
    s8 *fwname;
    const struct firmware *fw;
    struct brcmf_usb_image *fw_image;
    int err;

    switch (devinfo->bus_pub.devid) {
    case 43143:
        fwname = BRCMF_USB_43143_FW_NAME;
        break;
    case 43235:
    case 43236:
    case 43238:
        fwname = BRCMF_USB_43236_FW_NAME;
        break;
    case 43242:
        fwname = BRCMF_USB_43242_FW_NAME;
        break;
    default:
        return -EINVAL;
        break;
    }

    list_for_each_entry(fw_image, &fw_image_list, list) {
        if (fw_image->fwname == fwname) {
            devinfo->image = fw_image->image;
            devinfo->image_len = fw_image->image_len;
            return 0;
        }
    }
    /* fw image not yet loaded. Load it now and add to list */
    err = request_firmware(&fw, fwname, devinfo->dev);
    if (!fw) {
        brcmf_dbg(ERROR, "fail to request firmware %s\n", fwname);
        return err;
    }
    if (check_file(fw->data) < 0) {
        brcmf_dbg(ERROR, "invalid firmware %s\n", fwname);
        return -EINVAL;
    }

    fw_image = kzalloc(sizeof(*fw_image), GFP_ATOMIC);
    if (!fw_image)
        return -ENOMEM;
    INIT_LIST_HEAD(&fw_image->list);
    list_add_tail(&fw_image->list, &fw_image_list);
    fw_image->fwname = fwname;
    fw_image->image = vmalloc(fw->size);
    if (!fw_image->image)
        return -ENOMEM;

    memcpy(fw_image->image, fw->data, fw->size);
    fw_image->image_len = fw->size;

    release_firmware(fw);

    devinfo->image = fw_image->image;
    devinfo->image_len = fw_image->image_len;

    return 0;
}


static
struct brcmf_usbdev *brcmf_usb_attach(struct brcmf_usbdev_info *devinfo,
                      int nrxq, int ntxq)
{
    devinfo->bus_pub.nrxq = nrxq;
    devinfo->rx_low_watermark = nrxq / 2;
    devinfo->bus_pub.devinfo = devinfo;
    devinfo->bus_pub.ntxq = ntxq;

    /* flow control when too many tx urbs posted */
    devinfo->tx_low_watermark = ntxq / 4;
    devinfo->tx_high_watermark = devinfo->tx_low_watermark * 3;
    devinfo->bus_pub.bus_mtu = BRCMF_USB_MAX_PKT_SIZE;

    /* Initialize other structure content */
    init_waitqueue_head(&devinfo->ioctl_resp_wait);

    /* Initialize the spinlocks */
    spin_lock_init(&devinfo->qlock);

    INIT_LIST_HEAD(&devinfo->rx_freeq);
    INIT_LIST_HEAD(&devinfo->rx_postq);

    INIT_LIST_HEAD(&devinfo->tx_freeq);
    INIT_LIST_HEAD(&devinfo->tx_postq);

    devinfo->tx_flowblock = false;

    devinfo->rx_reqs = brcmf_usbdev_qinit(&devinfo->rx_freeq, nrxq);
    if (!devinfo->rx_reqs)
        goto error;

    devinfo->tx_reqs = brcmf_usbdev_qinit(&devinfo->tx_freeq, ntxq);
    if (!devinfo->tx_reqs)
        goto error;
    devinfo->tx_freecount = ntxq;

    devinfo->intr_urb = usb_alloc_urb(0, GFP_ATOMIC);
    if (!devinfo->intr_urb) {
        brcmf_dbg(ERROR, "usb_alloc_urb (intr) failed\n");
        goto error;
    }
    devinfo->ctl_urb = usb_alloc_urb(0, GFP_ATOMIC);
    if (!devinfo->ctl_urb) {
        brcmf_dbg(ERROR, "usb_alloc_urb (ctl) failed\n");
        goto error;
    }
    devinfo->bulk_urb = usb_alloc_urb(0, GFP_ATOMIC);
    if (!devinfo->bulk_urb) {
        brcmf_dbg(ERROR, "usb_alloc_urb (bulk) failed\n");
        goto error;
    }

    init_waitqueue_head(&devinfo->wait);
    if (!brcmf_usb_dlneeded(devinfo))
        return &devinfo->bus_pub;

    brcmf_dbg(TRACE, "start fw downloading\n");
    if (brcmf_usb_get_fw(devinfo))
        goto error;

    if (brcmf_usb_fw_download(devinfo))
        goto error;

    return &devinfo->bus_pub;

error:
    brcmf_dbg(ERROR, "failed!\n");
    brcmf_usb_detach(devinfo);
    return NULL;
}

static int brcmf_usb_probe_cb(struct brcmf_usbdev_info *devinfo,
                  const char *desc, u32 bustype, u32 hdrlen)
{
    struct brcmf_bus *bus = NULL;
    struct brcmf_usbdev *bus_pub = NULL;
    int ret;
    struct device *dev = devinfo->dev;

    bus_pub = brcmf_usb_attach(devinfo, BRCMF_USB_NRXQ, BRCMF_USB_NTXQ);
    if (!bus_pub)
        return -ENODEV;

    bus = kzalloc(sizeof(struct brcmf_bus), GFP_ATOMIC);
    if (!bus) {
        ret = -ENOMEM;
        goto fail;
    }

    bus_pub->bus = bus;
    bus->brcmf_bus_txdata = brcmf_usb_tx;
    bus->brcmf_bus_init = brcmf_usb_up;
    bus->brcmf_bus_stop = brcmf_usb_down;
    bus->brcmf_bus_txctl = brcmf_usb_tx_ctlpkt;
    bus->brcmf_bus_rxctl = brcmf_usb_rx_ctlpkt;
    bus->type = bustype;
    bus->bus_priv.usb = bus_pub;
    dev_set_drvdata(dev, bus);

    /* Attach to the common driver interface */
    ret = brcmf_attach(hdrlen, dev);
    if (ret) {
        brcmf_dbg(ERROR, "dhd_attach failed\n");
        goto fail;
    }

    ret = brcmf_bus_start(dev);
    if (ret) {
        brcmf_dbg(ERROR, "dongle is not responding\n");
        brcmf_detach(dev);
        goto fail;
    }

    return 0;
fail:
    /* Release resources in reverse order */
    kfree(bus);
    brcmf_usb_detach(devinfo);
    return ret;
}

static void
brcmf_usb_disconnect_cb(struct brcmf_usbdev_info *devinfo)
{
    if (!devinfo)
        return;
    brcmf_dbg(TRACE, "enter: bus_pub %p\n", devinfo);

    brcmf_detach(devinfo->dev);
    kfree(devinfo->bus_pub.bus);
    brcmf_usb_detach(devinfo);
}

static int
brcmf_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
    int ep;
    struct usb_endpoint_descriptor *endpoint;
    int ret = 0;
    struct usb_device *usb = interface_to_usbdev(intf);
    int num_of_eps;
    u8 endpoint_num;
    struct brcmf_usbdev_info *devinfo;

    brcmf_dbg(TRACE, "enter\n");

    devinfo = kzalloc(sizeof(*devinfo), GFP_ATOMIC);
    if (devinfo == NULL)
        return -ENOMEM;

    devinfo->usbdev = usb;
    devinfo->dev = &usb->dev;

    usb_set_intfdata(intf, devinfo);

    /* Check that the device supports only one configuration */
    if (usb->descriptor.bNumConfigurations != 1) {
        ret = -1;
        goto fail;
    }

    if (usb->descriptor.bDeviceClass != USB_CLASS_VENDOR_SPEC) {
        ret = -1;
        goto fail;
    }

    /*
     * Only the BDC interface configuration is supported:
     *  Device class: USB_CLASS_VENDOR_SPEC
     *  if0 class: USB_CLASS_VENDOR_SPEC
     *  if0/ep0: control
     *  if0/ep1: bulk in
     *  if0/ep2: bulk out (ok if swapped with bulk in)
     */
    if (CONFIGDESC(usb)->bNumInterfaces != 1) {
        ret = -1;
        goto fail;
    }

    /* Check interface */
    if (IFDESC(usb, CONTROL_IF).bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
        IFDESC(usb, CONTROL_IF).bInterfaceSubClass != 2 ||
        IFDESC(usb, CONTROL_IF).bInterfaceProtocol != 0xff) {
        brcmf_dbg(ERROR, "invalid control interface: class %d, subclass %d, proto %d\n",
              IFDESC(usb, CONTROL_IF).bInterfaceClass,
              IFDESC(usb, CONTROL_IF).bInterfaceSubClass,
              IFDESC(usb, CONTROL_IF).bInterfaceProtocol);
        ret = -1;
        goto fail;
    }

    /* Check control endpoint */
    endpoint = &IFEPDESC(usb, CONTROL_IF, 0);
    if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
        != USB_ENDPOINT_XFER_INT) {
        brcmf_dbg(ERROR, "invalid control endpoint %d\n",
              endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
        ret = -1;
        goto fail;
    }

    endpoint_num = endpoint->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
    devinfo->intr_pipe = usb_rcvintpipe(usb, endpoint_num);

    devinfo->rx_pipe = 0;
    devinfo->rx_pipe2 = 0;
    devinfo->tx_pipe = 0;
    num_of_eps = IFDESC(usb, BULK_IF).bNumEndpoints - 1;

    /* Check data endpoints and get pipes */
    for (ep = 1; ep <= num_of_eps; ep++) {
        endpoint = &IFEPDESC(usb, BULK_IF, ep);
        if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
            USB_ENDPOINT_XFER_BULK) {
            brcmf_dbg(ERROR, "invalid data endpoint %d\n", ep);
            ret = -1;
            goto fail;
        }

        endpoint_num = endpoint->bEndpointAddress &
                   USB_ENDPOINT_NUMBER_MASK;
        if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
            == USB_DIR_IN) {
            if (!devinfo->rx_pipe) {
                devinfo->rx_pipe =
                    usb_rcvbulkpipe(usb, endpoint_num);
            } else {
                devinfo->rx_pipe2 =
                    usb_rcvbulkpipe(usb, endpoint_num);
            }
        } else {
            devinfo->tx_pipe = usb_sndbulkpipe(usb, endpoint_num);
        }
    }

    /* Allocate interrupt URB and data buffer */
    /* RNDIS says 8-byte intr, our old drivers used 4-byte */
    if (IFEPDESC(usb, CONTROL_IF, 0).wMaxPacketSize == cpu_to_le16(16))
        devinfo->intr_size = 8;
    else
        devinfo->intr_size = 4;

    devinfo->interval = IFEPDESC(usb, CONTROL_IF, 0).bInterval;

    if (usb->speed == USB_SPEED_HIGH)
        brcmf_dbg(INFO, "Broadcom high speed USB wireless device detected\n");
    else
        brcmf_dbg(INFO, "Broadcom full speed USB wireless device detected\n");

    ret = brcmf_usb_probe_cb(devinfo, "", USB_BUS, 0);
    if (ret)
        goto fail;

    /* Success */
    return 0;

fail:
    brcmf_dbg(ERROR, "failed with errno %d\n", ret);
    kfree(devinfo);
    usb_set_intfdata(intf, NULL);
    return ret;

}

static void
brcmf_usb_disconnect(struct usb_interface *intf)
{
    struct brcmf_usbdev_info *devinfo;

    brcmf_dbg(TRACE, "enter\n");
    devinfo = (struct brcmf_usbdev_info *)usb_get_intfdata(intf);
    brcmf_usb_disconnect_cb(devinfo);
    kfree(devinfo);
}

/*
 *  only need to signal the bus being down and update the suspend state.
 */
static int brcmf_usb_suspend(struct usb_interface *intf, pm_message_t state)
{
    struct usb_device *usb = interface_to_usbdev(intf);
    struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(&usb->dev);

    brcmf_dbg(TRACE, "enter\n");
    devinfo->bus_pub.state = BCMFMAC_USB_STATE_DOWN;
    devinfo->suspend_state = USBOS_SUSPEND_STATE_SUSPENDED;
    return 0;
}

/*
 *  mark suspend state active and crank up the bus.
 */
static int brcmf_usb_resume(struct usb_interface *intf)
{
    struct usb_device *usb = interface_to_usbdev(intf);
    struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(&usb->dev);

    brcmf_dbg(TRACE, "enter\n");
    devinfo->suspend_state = USBOS_SUSPEND_STATE_DEVICE_ACTIVE;
    brcmf_bus_start(&usb->dev);
    return 0;
}

#define BRCMF_USB_VENDOR_ID_BROADCOM    0x0a5c
#define BRCMF_USB_DEVICE_ID_43143   0xbd1e
#define BRCMF_USB_DEVICE_ID_43236   0xbd17
#define BRCMF_USB_DEVICE_ID_43242   0xbd1f
#define BRCMF_USB_DEVICE_ID_BCMFW   0x0bdc

static struct usb_device_id brcmf_usb_devid_table[] = {
    { USB_DEVICE(BRCMF_USB_VENDOR_ID_BROADCOM, BRCMF_USB_DEVICE_ID_43143) },
    { USB_DEVICE(BRCMF_USB_VENDOR_ID_BROADCOM, BRCMF_USB_DEVICE_ID_43236) },
    { USB_DEVICE(BRCMF_USB_VENDOR_ID_BROADCOM, BRCMF_USB_DEVICE_ID_43242) },
    /* special entry for device with firmware loaded and running */
    { USB_DEVICE(BRCMF_USB_VENDOR_ID_BROADCOM, BRCMF_USB_DEVICE_ID_BCMFW) },
    { }
};
MODULE_DEVICE_TABLE(usb, brcmf_usb_devid_table);
MODULE_FIRMWARE(BRCMF_USB_43143_FW_NAME);
MODULE_FIRMWARE(BRCMF_USB_43236_FW_NAME);
MODULE_FIRMWARE(BRCMF_USB_43242_FW_NAME);

/* TODO: suspend and resume entries */
static struct usb_driver brcmf_usbdrvr = {
    .name = KBUILD_MODNAME,
    .probe = brcmf_usb_probe,
    .disconnect = brcmf_usb_disconnect,
    .id_table = brcmf_usb_devid_table,
    .suspend = brcmf_usb_suspend,
    .resume = brcmf_usb_resume,
    .supports_autosuspend = 1,
    .disable_hub_initiated_lpm = 1,
};

static void brcmf_release_fw(struct list_head *q)
{
    struct brcmf_usb_image *fw_image, *next;

    list_for_each_entry_safe(fw_image, next, q, list) {
        vfree(fw_image->image);
        list_del_init(&fw_image->list);
    }
}


void brcmf_usb_exit(void)
{
    usb_deregister(&brcmf_usbdrvr);
    brcmf_release_fw(&fw_image_list);
}

void brcmf_usb_init(void)
{
    INIT_LIST_HEAD(&fw_image_list);
    usb_register(&brcmf_usbdrvr);
}