brcm80211: fmac: add USB support for bcm43235/6/8 chipsets

This patch extends the use of the brcmfmac driver with support for
chipsets with a USB host interface. The first chipsets supported are
the bcm43235, bcm43236, and bcm43238 for which firmware has been
submitted.

This driver change has been successfully built for x86, x86_64,
ppc64, arm_le, and mips_be.

It has been tested successfully on x86 and x86_64.

Cc: M. Lambert <lambertm@westman.wave.ca>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Kan Yan <kanyan@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1623 insertions, 0 deletions

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/usb.c b/drivers/net/wireless/brcm80211/brcmfmac/usb.c
new file mode 100644
index 000000000000..934ed782620c
--- /dev/null
+++ b/drivers/net/wireless/brcm80211/brcmfmac/usb.c
@@ -0,0 +1,1623 @@
+/*
+ * 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 || !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->bus_pub.state == BCMFMAC_USB_STATE_UP)
+		return 0;
+
+	if (devinfo == 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;
+
+	/* 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);
+}