drivers/net/wireless/brcm80211/brcmfmac/usb.c

/*
 * 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 <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_FW_NAME	"brcm/brcmfmac-usb.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_probe_info {
	void *usbdev_info;
	struct usb_device *usb; /* USB device pointer from OS */
	uint rx_pipe, tx_pipe, intr_pipe, rx_pipe2;
	int intr_size; /* Size of interrupt message */
	int interval;  /* Interrupt polling interval */
	int vid;
	int pid;
	enum usb_device_speed device_speed;
	enum usbdev_suspend_state suspend_state;
	struct usb_interface *intf;
};
static struct brcmf_usb_probe_info usbdev_probe_info;

struct brcmf_usb_image {
	void *data;
	u32 len;
};
static struct brcmf_usb_image g_image = { NULL, 0 };

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;
	bool txoff;
	bool rxoff;
	bool txoverride;

	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;
	enum usb_device_speed  device_speed;

	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;

	bool rxctl_deferrespok;

	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 */

	struct brcmf_usb_probe_info probe_info;

};

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;
}

#if 0
static void
brcmf_usb_txflowcontrol(struct brcmf_usbdev_info *devinfo, bool onoff)
{
	dhd_txflowcontrol(devinfo->bus_pub.netdev, 0, onoff);
}
#endif

static int brcmf_usb_ioctl_resp_wait(struct brcmf_usbdev_info *devinfo,
	 uint *condition, bool *pending)
{
	DECLARE_WAITQUEUE(wait, current);
	int timeout = IOCTL_RESP_TIMEOUT;

	/* Convert timeout in millsecond to jiffies */
	timeout = msecs_to_jiffies(timeout);
	/* Wait until control frame is available */
	add_wait_queue(&devinfo->ioctl_resp_wait, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	smp_mb();
	while (!(*condition) && (!signal_pending(current) && timeout)) {
		timeout = schedule_timeout(timeout);
		/* Wait until control frame is available */
		smp_mb();
	}

	if (signal_pending(current))
		*pending = true;

	set_current_state(TASK_RUNNING);
	remove_wait_queue(&devinfo->ioctl_resp_wait, &wait);

	return timeout;
}

static int brcmf_usb_ioctl_resp_wake(struct brcmf_usbdev_info *devinfo)
{
	if (waitqueue_active(&devinfo->ioctl_resp_wait))
		wake_up_interruptible(&devinfo->ioctl_resp_wait);

	return 0;
}

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;

	if (devinfo->rxctl_deferrespok) {
		/* BMAC model */
		devinfo->ctl_read.bRequestType = USB_DIR_IN
			| USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
		devinfo->ctl_read.bRequest = DL_DEFER_RESP_OK;
	} else {
		/* full dongle model */
		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;
	bool pending;
	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;

	err = brcmf_usb_send_ctl(devinfo, buf, len);
	if (err) {
		brcmf_dbg(ERROR, "fail %d bytes: %d\n", err, len);
		return err;
	}

	devinfo->ctl_completed = false;
	timeout = brcmf_usb_ioctl_resp_wait(devinfo, &devinfo->ctl_completed,
					    &pending);
	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;
	bool pending;
	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;

	err = brcmf_usb_recv_ctl(devinfo, buf, len);
	if (err) {
		brcmf_dbg(ERROR, "fail %d bytes: %d\n", err, len);
		return err;
	}
	devinfo->ctl_completed = false;
	timeout = brcmf_usb_ioctl_resp_wait(devinfo, &devinfo->ctl_completed,
					    &pending);
	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)
{
	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);
	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)
{
	unsigned long flags;
	spin_lock_irqsave(&devinfo->qlock, flags);
	list_add_tail(&req->list, q);
	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.stats.tx_packets++;
	else
		devinfo->bus_pub.stats.tx_errors++;

	dev_kfree_skb(req->skb);
	req->skb = NULL;
	brcmf_usb_enq(devinfo, &devinfo->tx_freeq, req);

}

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.stats.rx_packets++;
	} else {
		devinfo->bus_pub.stats.rx_errors++;
		dev_kfree_skb(skb);
		brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req);
		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 {
		dev_kfree_skb(skb);
	}
	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);
		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->urb->transfer_flags |= URB_ZERO_PACKET;
	req->devinfo = devinfo;

	ret = usb_submit_urb(req->urb, GFP_ATOMIC);
	if (ret == 0) {
		brcmf_usb_enq(devinfo, &devinfo->rx_postq, req);
	} else {
		dev_kfree_skb(req->skb);
		req->skb = NULL;
		brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req);
	}
	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)
		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);
	if (!req) {
		brcmf_dbg(ERROR, "no req to send\n");
		return -ENOMEM;
	}
	if (!req->urb) {
		brcmf_dbg(ERROR, "no urb for req %p\n", req);
		return -ENOBUFS;
	}

	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;
	ret = usb_submit_urb(req->urb, GFP_ATOMIC);
	if (!ret) {
		brcmf_usb_enq(devinfo, &devinfo->tx_postq, req);
	} else {
		req->skb = NULL;
		brcmf_usb_enq(devinfo, &devinfo->tx_freeq, req);
	}

	return ret;
}


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

	if (devinfo == NULL)
		return -EINVAL;

	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.attrib.devid = chipid;
		devinfo->bus_pub.attrib.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.attrib.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.attrib.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 43235:
	case 43236:
	case 43238:
		return (chiprev == 3);
	default:
		break;
	}
	return false;
}

static int
brcmf_usb_fw_download(struct brcmf_usbdev_info *devinfo)
{
	struct brcmf_usb_attrib *attr;
	int err;

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

	attr = &devinfo->bus_pub.attrib;

	if (!brcmf_usb_chip_support(attr->devid, attr->chiprev)) {
		brcmf_dbg(ERROR, "unsupported chip %d rev %d\n",
			  attr->devid, attr->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(const struct brcmf_usbdev *bus_pub)
{
	struct brcmf_usbdev_info *devinfo =
		(struct brcmf_usbdev_info *)bus_pub;

	brcmf_dbg(TRACE, "devinfo %p\n", devinfo);

	/* store the image globally */
	g_image.data = devinfo->image;
	g_image.len = devinfo->image_len;

	/* 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);
	kfree(devinfo);
}

#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;
	int err;

	devinfo->image = g_image.data;
	devinfo->image_len = g_image.len;

	/*
	 * if we have an image we can leave here.
	 */
	if (devinfo->image)
		return 0;

	fwname = BRCMF_USB_FW_NAME;

	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;
	}

	devinfo->image = kmalloc(fw->size, GFP_ATOMIC); /* plus nvram */
	if (!devinfo->image)
		return -ENOMEM;

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

	release_firmware(fw);
	return 0;
}


static
struct brcmf_usbdev *brcmf_usb_attach(int nrxq, int ntxq, struct device *dev)
{
	struct brcmf_usbdev_info *devinfo;

	devinfo = kzalloc(sizeof(struct brcmf_usbdev_info), GFP_ATOMIC);
	if (devinfo == NULL)
		return NULL;

	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->dev = dev;
	devinfo->usbdev = usbdev_probe_info.usb;
	devinfo->tx_pipe = usbdev_probe_info.tx_pipe;
	devinfo->rx_pipe = usbdev_probe_info.rx_pipe;
	devinfo->rx_pipe2 = usbdev_probe_info.rx_pipe2;
	devinfo->intr_pipe = usbdev_probe_info.intr_pipe;

	devinfo->interval = usbdev_probe_info.interval;
	devinfo->intr_size = usbdev_probe_info.intr_size;

	memcpy(&devinfo->probe_info, &usbdev_probe_info,
		sizeof(struct brcmf_usb_probe_info));
	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->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->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->rxctl_deferrespok = 0;

	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->bus_pub);
	return NULL;
}

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


	bus_pub = brcmf_usb_attach(BRCMF_USB_NRXQ, BRCMF_USB_NTXQ, dev);
	if (!bus_pub) {
		ret = -ENODEV;
		goto fail;
	}

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

	/* add interface and open for business */
	ret = brcmf_add_if(dev, 0, "wlan%d", NULL);
	if (ret) {
		brcmf_dbg(ERROR, "Add primary net device interface failed!!\n");
		brcmf_detach(dev);
		goto fail;
	}

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

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

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

}

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;

	brcmf_dbg(TRACE, "enter\n");

	usbdev_probe_info.usb = usb;
	usbdev_probe_info.intf = intf;

	if (id != NULL) {
		usbdev_probe_info.vid = id->idVendor;
		usbdev_probe_info.pid = id->idProduct;
	}

	usb_set_intfdata(intf, &usbdev_probe_info);

	/* 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;
	usbdev_probe_info.intr_pipe = usb_rcvintpipe(usb, endpoint_num);

	usbdev_probe_info.rx_pipe = 0;
	usbdev_probe_info.rx_pipe2 = 0;
	usbdev_probe_info.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 (!usbdev_probe_info.rx_pipe) {
				usbdev_probe_info.rx_pipe =
					usb_rcvbulkpipe(usb, endpoint_num);
			} else {
				usbdev_probe_info.rx_pipe2 =
					usb_rcvbulkpipe(usb, endpoint_num);
			}
		} else {
			usbdev_probe_info.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))
		usbdev_probe_info.intr_size = 8;
	else
		usbdev_probe_info.intr_size = 4;

	usbdev_probe_info.interval = IFEPDESC(usb, CONTROL_IF, 0).bInterval;

	usbdev_probe_info.device_speed = usb->speed;
	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(&usb->dev, "", USB_BUS, 0);
	if (ret)
		goto fail;

	/* Success */
	return 0;

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

}

static void
brcmf_usb_disconnect(struct usb_interface *intf)
{
	struct usb_device *usb = interface_to_usbdev(intf);

	brcmf_dbg(TRACE, "enter\n");
	brcmf_usb_disconnect_cb(brcmf_usb_get_buspub(&usb->dev));
	usb_set_intfdata(intf, NULL);
}

/*
 *	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_43236	0xbd17
#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_43236) },
	/* 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_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
};

void brcmf_usb_exit(void)
{
	usb_deregister(&brcmf_usbdrvr);
	kfree(g_image.data);
	g_image.data = NULL;
	g_image.len = 0;
}

int brcmf_usb_init(void)
{
	return usb_register(&brcmf_usbdrvr);
}