1 files changed, 541 insertions, 282 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 84e9bdb7391..86c43d112a4 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -1,5 +1,6 @@
 /*
-	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
+	Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
+	Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
 	<http://rt2x00.serialmonkey.com>
 
 	This program is free software; you can redistribute it and/or modify
@@ -13,9 +14,7 @@
 	GNU General Public License for more details.
 
 	You should have received a copy of the GNU General Public License
-	along with this program; if not, write to the
-	Free Software Foundation, Inc.,
-	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+	along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
 /*
@@ -25,6 +24,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/usb.h>
 #include <linux/bug.h>
 
@@ -40,14 +40,15 @@ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
 			     void *buffer, const u16 buffer_length,
 			     const int timeout)
 {
-	struct usb_device *usb_dev =
-	    interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
+	struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 	int status;
 	unsigned int i;
 	unsigned int pipe =
 	    (requesttype == USB_VENDOR_REQUEST_IN) ?
 	    usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
 
+	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+		return -ENODEV;
 
 	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
 		status = usb_control_msg(usb_dev, pipe, request, requesttype,
@@ -61,13 +62,21 @@ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
 		 * -ENODEV: Device has disappeared, no point continuing.
 		 * All other errors: Try again.
 		 */
-		else if (status == -ENODEV)
+		else if (status == -ENODEV) {
+			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 			break;
+		}
 	}
 
-	ERROR(rt2x00dev,
-	      "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
-	      request, offset, status);
+	/* If the port is powered down, we get a -EPROTO error, and this
+	 * leads to a endless loop. So just say that the device is gone.
+	 */
+	if (status == -EPROTO)
+		clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
+
+	rt2x00_err(rt2x00dev,
+		   "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n",
+		   request, offset, status);
 
 	return status;
 }
@@ -80,25 +89,25 @@ int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
 {
 	int status;
 
-	BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
+	BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
 
 	/*
 	 * Check for Cache availability.
 	 */
-	if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
-		ERROR(rt2x00dev, "CSR cache not available.\n");
+	if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
+		rt2x00_err(rt2x00dev, "CSR cache not available\n");
 		return -ENOMEM;
 	}
 
 	if (requesttype == USB_VENDOR_REQUEST_OUT)
-		memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
+		memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
 
 	status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
-					  offset, 0, rt2x00dev->csr_cache,
+					  offset, 0, rt2x00dev->csr.cache,
 					  buffer_length, timeout);
 
 	if (!status && requesttype == USB_VENDOR_REQUEST_IN)
-		memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
+		memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 
 	return status;
 }
@@ -109,340 +118,617 @@ int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 				  const u16 offset, void *buffer,
 				  const u16 buffer_length, const int timeout)
 {
-	int status;
-
-	mutex_lock(&rt2x00dev->usb_cache_mutex);
-
-	status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
-						requesttype, offset, buffer,
-						buffer_length, timeout);
+	int status = 0;
+	unsigned char *tb;
+	u16 off, len, bsize;
+
+	mutex_lock(&rt2x00dev->csr_mutex);
+
+	tb  = (char *)buffer;
+	off = offset;
+	len = buffer_length;
+	while (len && !status) {
+		bsize = min_t(u16, CSR_CACHE_SIZE, len);
+		status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
+							requesttype, off, tb,
+							bsize, timeout);
+
+		tb  += bsize;
+		len -= bsize;
+		off += bsize;
+	}
 
-	mutex_unlock(&rt2x00dev->usb_cache_mutex);
+	mutex_unlock(&rt2x00dev->csr_mutex);
 
 	return status;
 }
 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 
-/*
- * TX data handlers.
- */
-static void rt2x00usb_interrupt_txdone(struct urb *urb)
+int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
+			   const unsigned int offset,
+			   const struct rt2x00_field32 field,
+			   u32 *reg)
 {
-	struct data_entry *entry = (struct data_entry *)urb->context;
-	struct data_ring *ring = entry->ring;
-	struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
-	__le32 *txd = (__le32 *)entry->skb->data;
-	u32 word;
-	int tx_status;
+	unsigned int i;
 
-	if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
-	    !__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
-		return;
+	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+		return -ENODEV;
 
-	rt2x00_desc_read(txd, 0, &word);
+	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
+		rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
+		if (!rt2x00_get_field32(*reg, field))
+			return 1;
+		udelay(REGISTER_BUSY_DELAY);
+	}
 
-	/*
-	 * Remove the descriptor data from the buffer.
-	 */
-	skb_pull(entry->skb, ring->desc_size);
+	rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n",
+		   offset, *reg);
+	*reg = ~0;
 
-	/*
-	 * Obtain the status about this packet.
-	 */
-	tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
 
-	rt2x00lib_txdone(entry, tx_status, 0);
 
-	/*
-	 * Make this entry available for reuse.
-	 */
-	entry->flags = 0;
-	rt2x00_ring_index_done_inc(entry->ring);
+struct rt2x00_async_read_data {
+	__le32 reg;
+	struct usb_ctrlrequest cr;
+	struct rt2x00_dev *rt2x00dev;
+	bool (*callback)(struct rt2x00_dev *, int, u32);
+};
 
+static void rt2x00usb_register_read_async_cb(struct urb *urb)
+{
+	struct rt2x00_async_read_data *rd = urb->context;
+	if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
+		if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
+			kfree(rd);
+	} else
+		kfree(rd);
+}
+
+void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
+				   const unsigned int offset,
+				   bool (*callback)(struct rt2x00_dev*, int, u32))
+{
+	struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
+	struct urb *urb;
+	struct rt2x00_async_read_data *rd;
+
+	rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
+	if (!rd)
+		return;
+
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		kfree(rd);
+		return;
+	}
+
+	rd->rt2x00dev = rt2x00dev;
+	rd->callback = callback;
+	rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
+	rd->cr.bRequest = USB_MULTI_READ;
+	rd->cr.wValue = 0;
+	rd->cr.wIndex = cpu_to_le16(offset);
+	rd->cr.wLength = cpu_to_le16(sizeof(u32));
+
+	usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
+			     (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
+			     rt2x00usb_register_read_async_cb, rd);
+	if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
+		kfree(rd);
+	usb_free_urb(urb);
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
+
+/*
+ * TX data handlers.
+ */
+static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
+{
 	/*
-	 * If the data ring was full before the txdone handler
-	 * we must make sure the packet queue in the mac80211 stack
-	 * is reenabled when the txdone handler has finished.
+	 * If the transfer to hardware succeeded, it does not mean the
+	 * frame was send out correctly. It only means the frame
+	 * was successfully pushed to the hardware, we have no
+	 * way to determine the transmission status right now.
+	 * (Only indirectly by looking at the failed TX counters
+	 * in the register).
 	 */
-	if (!rt2x00_ring_full(ring))
-		ieee80211_wake_queue(rt2x00dev->hw,
-				     entry->tx_status.control.queue);
+	if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
+		rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
+	else
+		rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
 }
 
-int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
-			    struct data_ring *ring, struct sk_buff *skb,
-			    struct ieee80211_tx_control *control)
+static void rt2x00usb_work_txdone(struct work_struct *work)
 {
-	struct usb_device *usb_dev =
-	    interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
-	struct data_entry *entry = rt2x00_get_data_entry(ring);
-	struct skb_desc *desc;
-	u32 length;
+	struct rt2x00_dev *rt2x00dev =
+	    container_of(work, struct rt2x00_dev, txdone_work);
+	struct data_queue *queue;
+	struct queue_entry *entry;
+
+	tx_queue_for_each(rt2x00dev, queue) {
+		while (!rt2x00queue_empty(queue)) {
+			entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
 
-	if (rt2x00_ring_full(ring))
-		return -EINVAL;
+			if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
+			    !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
+				break;
 
-	if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
-		ERROR(rt2x00dev,
-		      "Arrived at non-free entry in the non-full queue %d.\n"
-		      "Please file bug report to %s.\n",
-		      control->queue, DRV_PROJECT);
-		return -EINVAL;
+			rt2x00usb_work_txdone_entry(entry);
+		}
 	}
+}
+
+static void rt2x00usb_interrupt_txdone(struct urb *urb)
+{
+	struct queue_entry *entry = (struct queue_entry *)urb->context;
+	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 
+	if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
+		return;
 	/*
-	 * Add the descriptor in front of the skb.
+	 * Check if the frame was correctly uploaded
 	 */
-	skb_push(skb, ring->desc_size);
-	memset(skb->data, 0, ring->desc_size);
-
+	if (urb->status)
+		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 	/*
-	 * Fill in skb descriptor
+	 * Report the frame as DMA done
 	 */
-	desc = get_skb_desc(skb);
-	desc->desc_len = ring->desc_size;
-	desc->data_len = skb->len - ring->desc_size;
-	desc->desc = skb->data;
-	desc->data = skb->data + ring->desc_size;
-	desc->ring = ring;
-	desc->entry = entry;
-
-	rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
+	rt2x00lib_dmadone(entry);
 
+	if (rt2x00dev->ops->lib->tx_dma_done)
+		rt2x00dev->ops->lib->tx_dma_done(entry);
 	/*
-	 * USB devices cannot blindly pass the skb->len as the
-	 * length of the data to usb_fill_bulk_urb. Pass the skb
-	 * to the driver to determine what the length should be.
+	 * Schedule the delayed work for reading the TX status
+	 * from the device.
 	 */
-	length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
+	if (!test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags) ||
+	    !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
+		queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
+}
+
+static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
+{
+	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+	struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
+	struct queue_entry_priv_usb *entry_priv = entry->priv_data;
+	u32 length;
+	int status;
+
+	if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
+	    test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
+		return false;
 
 	/*
-	 * Initialize URB and send the frame to the device.
+	 * USB devices require certain padding at the end of each frame
+	 * and urb. Those paddings are not included in skbs. Pass entry
+	 * to the driver to determine what the overall length should be.
 	 */
-	__set_bit(ENTRY_OWNER_NIC, &entry->flags);
-	usb_fill_bulk_urb(entry->priv, usb_dev, usb_sndbulkpipe(usb_dev, 1),
-			  skb->data, length, rt2x00usb_interrupt_txdone, entry);
-	usb_submit_urb(entry->priv, GFP_ATOMIC);
+	length = rt2x00dev->ops->lib->get_tx_data_len(entry);
 
-	rt2x00_ring_index_inc(ring);
+	status = skb_padto(entry->skb, length);
+	if (unlikely(status)) {
+		/* TODO: report something more appropriate than IO_FAILED. */
+		rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n");
+		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+		rt2x00lib_dmadone(entry);
 
-	return 0;
+		return false;
+	}
+
+	usb_fill_bulk_urb(entry_priv->urb, usb_dev,
+			  usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
+			  entry->skb->data, length,
+			  rt2x00usb_interrupt_txdone, entry);
+
+	status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+	if (status) {
+		if (status == -ENODEV)
+			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
+		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+		rt2x00lib_dmadone(entry);
+	}
+
+	return false;
 }
-EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 
 /*
  * RX data handlers.
  */
+static void rt2x00usb_work_rxdone(struct work_struct *work)
+{
+	struct rt2x00_dev *rt2x00dev =
+	    container_of(work, struct rt2x00_dev, rxdone_work);
+	struct queue_entry *entry;
+	struct skb_frame_desc *skbdesc;
+	u8 rxd[32];
+
+	while (!rt2x00queue_empty(rt2x00dev->rx)) {
+		entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
+
+		if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
+		    !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
+			break;
+
+		/*
+		 * Fill in desc fields of the skb descriptor
+		 */
+		skbdesc = get_skb_frame_desc(entry->skb);
+		skbdesc->desc = rxd;
+		skbdesc->desc_len = entry->queue->desc_size;
+
+		/*
+		 * Send the frame to rt2x00lib for further processing.
+		 */
+		rt2x00lib_rxdone(entry, GFP_KERNEL);
+	}
+}
+
 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 {
-	struct data_entry *entry = (struct data_entry *)urb->context;
-	struct data_ring *ring = entry->ring;
-	struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
-	struct sk_buff *skb;
-	struct ieee80211_hdr *hdr;
-	struct skb_desc *skbdesc;
-	struct rxdata_entry_desc desc;
-	int header_size;
-	int frame_size;
-
-	if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
-	    !test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
+	struct queue_entry *entry = (struct queue_entry *)urb->context;
+	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+
+	if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 		return;
 
 	/*
+	 * Report the frame as DMA done
+	 */
+	rt2x00lib_dmadone(entry);
+
+	/*
 	 * Check if the received data is simply too small
 	 * to be actually valid, or if the urb is signaling
 	 * a problem.
 	 */
-	if (urb->actual_length < entry->ring->desc_size || urb->status)
-		goto skip_entry;
+	if (urb->actual_length < entry->queue->desc_size || urb->status)
+		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 
 	/*
-	 * Fill in skb descriptor
+	 * Schedule the delayed work for reading the RX status
+	 * from the device.
 	 */
-	skbdesc = get_skb_desc(entry->skb);
-	skbdesc->ring = ring;
-	skbdesc->entry = entry;
+	queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
+}
 
-	memset(&desc, 0, sizeof(desc));
-	rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
+static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
+{
+	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+	struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
+	struct queue_entry_priv_usb *entry_priv = entry->priv_data;
+	int status;
 
-	/*
-	 * Allocate a new sk buffer to replace the current one.
-	 * If allocation fails, we should drop the current frame
-	 * so we can recycle the existing sk buffer for the new frame.
-	 * As alignment we use 2 and not NET_IP_ALIGN because we need
-	 * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
-	 * can be 0 on some hardware). We use these 2 bytes for frame
-	 * alignment later, we assume that the chance that
-	 * header_size % 4 == 2 is bigger then header_size % 2 == 0
-	 * and thus optimize alignment by reserving the 2 bytes in
-	 * advance.
-	 */
-	frame_size = entry->ring->data_size + entry->ring->desc_size;
-	skb = dev_alloc_skb(frame_size + 2);
-	if (!skb)
-		goto skip_entry;
+	if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
+	    test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
+		return false;
 
-	skb_reserve(skb, 2);
-	skb_put(skb, frame_size);
+	rt2x00lib_dmastart(entry);
 
-	/*
-	 * The data behind the ieee80211 header must be
-	 * aligned on a 4 byte boundary.
-	 */
-	hdr = (struct ieee80211_hdr *)entry->skb->data;
-	header_size =
-	    ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+	usb_fill_bulk_urb(entry_priv->urb, usb_dev,
+			  usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
+			  entry->skb->data, entry->skb->len,
+			  rt2x00usb_interrupt_rxdone, entry);
 
-	if (header_size % 4 == 0) {
-		skb_push(entry->skb, 2);
-		memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2);
+	status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+	if (status) {
+		if (status == -ENODEV)
+			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
+		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+		rt2x00lib_dmadone(entry);
 	}
 
-	/*
-	 * Trim the entire buffer down to only contain the valid frame data
-	 * excluding the device descriptor. The position of the descriptor
-	 * varies. This means that we should check where the descriptor is
-	 * and decide if we need to pull the data pointer to exclude the
-	 * device descriptor.
-	 */
-	if (skbdesc->data > skbdesc->desc)
-		skb_pull(entry->skb, skbdesc->desc_len);
-	skb_trim(entry->skb, desc.size);
+	return false;
+}
+
+void rt2x00usb_kick_queue(struct data_queue *queue)
+{
+	switch (queue->qid) {
+	case QID_AC_VO:
+	case QID_AC_VI:
+	case QID_AC_BE:
+	case QID_AC_BK:
+		if (!rt2x00queue_empty(queue))
+			rt2x00queue_for_each_entry(queue,
+						   Q_INDEX_DONE,
+						   Q_INDEX,
+						   NULL,
+						   rt2x00usb_kick_tx_entry);
+		break;
+	case QID_RX:
+		if (!rt2x00queue_full(queue))
+			rt2x00queue_for_each_entry(queue,
+						   Q_INDEX,
+						   Q_INDEX_DONE,
+						   NULL,
+						   rt2x00usb_kick_rx_entry);
+		break;
+	default:
+		break;
+	}
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
+
+static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data)
+{
+	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+	struct queue_entry_priv_usb *entry_priv = entry->priv_data;
+	struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
+
+	if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
+		return false;
+
+	usb_kill_urb(entry_priv->urb);
 
 	/*
-	 * Send the frame to rt2x00lib for further processing.
+	 * Kill guardian urb (if required by driver).
 	 */
-	rt2x00lib_rxdone(entry, entry->skb, &desc);
+	if ((entry->queue->qid == QID_BEACON) &&
+	    (test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags)))
+		usb_kill_urb(bcn_priv->guardian_urb);
+
+	return false;
+}
+
+void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
+{
+	struct work_struct *completion;
+	unsigned int i;
+
+	if (drop)
+		rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
+					   rt2x00usb_flush_entry);
 
 	/*
-	 * Replace current entry's skb with the newly allocated one,
-	 * and reinitialize the urb.
+	 * Obtain the queue completion handler
 	 */
-	entry->skb = skb;
-	urb->transfer_buffer = entry->skb->data;
-	urb->transfer_buffer_length = entry->skb->len;
-
-skip_entry:
-	if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
-		__set_bit(ENTRY_OWNER_NIC, &entry->flags);
-		usb_submit_urb(urb, GFP_ATOMIC);
+	switch (queue->qid) {
+	case QID_AC_VO:
+	case QID_AC_VI:
+	case QID_AC_BE:
+	case QID_AC_BK:
+		completion = &queue->rt2x00dev->txdone_work;
+		break;
+	case QID_RX:
+		completion = &queue->rt2x00dev->rxdone_work;
+		break;
+	default:
+		return;
+	}
+
+	for (i = 0; i < 10; i++) {
+		/*
+		 * Check if the driver is already done, otherwise we
+		 * have to sleep a little while to give the driver/hw
+		 * the oppurtunity to complete interrupt process itself.
+		 */
+		if (rt2x00queue_empty(queue))
+			break;
+
+		/*
+		 * Schedule the completion handler manually, when this
+		 * worker function runs, it should cleanup the queue.
+		 */
+		queue_work(queue->rt2x00dev->workqueue, completion);
+
+		/*
+		 * Wait for a little while to give the driver
+		 * the oppurtunity to recover itself.
+		 */
+		msleep(10);
 	}
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
+
+static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
+{
+	rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced forced reset\n",
+		    queue->qid);
+
+	rt2x00queue_stop_queue(queue);
+	rt2x00queue_flush_queue(queue, true);
+	rt2x00queue_start_queue(queue);
+}
+
+static int rt2x00usb_dma_timeout(struct data_queue *queue)
+{
+	struct queue_entry *entry;
 
-	rt2x00_ring_index_inc(ring);
+	entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
+	return rt2x00queue_dma_timeout(entry);
 }
 
+void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
+{
+	struct data_queue *queue;
+
+	tx_queue_for_each(rt2x00dev, queue) {
+		if (!rt2x00queue_empty(queue)) {
+			if (rt2x00usb_dma_timeout(queue))
+				rt2x00usb_watchdog_tx_dma(queue);
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
+
 /*
  * Radio handlers
  */
 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 {
-	struct data_ring *ring;
-	unsigned int i;
-
-	rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
+	rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 				    REGISTER_TIMEOUT);
-
-	/*
-	 * Cancel all rings.
-	 */
-	ring_for_each(rt2x00dev, ring) {
-		for (i = 0; i < ring->stats.limit; i++)
-			usb_kill_urb(ring->entry[i].priv);
-	}
 }
 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 
 /*
  * Device initialization handlers.
  */
-void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
-			    struct data_entry *entry)
+void rt2x00usb_clear_entry(struct queue_entry *entry)
 {
-	struct usb_device *usb_dev =
-	     interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
+	entry->flags = 0;
 
-	usb_fill_bulk_urb(entry->priv, usb_dev,
-			  usb_rcvbulkpipe(usb_dev, 1),
-			  entry->skb->data, entry->skb->len,
-			  rt2x00usb_interrupt_rxdone, entry);
+	if (entry->queue->qid == QID_RX)
+		rt2x00usb_kick_rx_entry(entry, NULL);
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
+
+static void rt2x00usb_assign_endpoint(struct data_queue *queue,
+				      struct usb_endpoint_descriptor *ep_desc)
+{
+	struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
+	int pipe;
+
+	queue->usb_endpoint = usb_endpoint_num(ep_desc);
 
-	__set_bit(ENTRY_OWNER_NIC, &entry->flags);
-	usb_submit_urb(entry->priv, GFP_ATOMIC);
+	if (queue->qid == QID_RX) {
+		pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
+		queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
+	} else {
+		pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
+		queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
+	}
+
+	if (!queue->usb_maxpacket)
+		queue->usb_maxpacket = 1;
 }
-EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 
-void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
-			    struct data_entry *entry)
+static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
 {
-	entry->flags = 0;
+	struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
+	struct usb_host_interface *intf_desc = intf->cur_altsetting;
+	struct usb_endpoint_descriptor *ep_desc;
+	struct data_queue *queue = rt2x00dev->tx;
+	struct usb_endpoint_descriptor *tx_ep_desc = NULL;
+	unsigned int i;
+
+	/*
+	 * Walk through all available endpoints to search for "bulk in"
+	 * and "bulk out" endpoints. When we find such endpoints collect
+	 * the information we need from the descriptor and assign it
+	 * to the queue.
+	 */
+	for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
+		ep_desc = &intf_desc->endpoint[i].desc;
+
+		if (usb_endpoint_is_bulk_in(ep_desc)) {
+			rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
+		} else if (usb_endpoint_is_bulk_out(ep_desc) &&
+			   (queue != queue_end(rt2x00dev))) {
+			rt2x00usb_assign_endpoint(queue, ep_desc);
+			queue = queue_next(queue);
+
+			tx_ep_desc = ep_desc;
+		}
+	}
+
+	/*
+	 * At least 1 endpoint for RX and 1 endpoint for TX must be available.
+	 */
+	if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
+		rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
+		return -EPIPE;
+	}
+
+	/*
+	 * It might be possible not all queues have a dedicated endpoint.
+	 * Loop through all TX queues and copy the endpoint information
+	 * which we have gathered from already assigned endpoints.
+	 */
+	txall_queue_for_each(rt2x00dev, queue) {
+		if (!queue->usb_endpoint)
+			rt2x00usb_assign_endpoint(queue, tx_ep_desc);
+	}
+
+	return 0;
 }
-EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 
-static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
-			       struct data_ring *ring)
+static int rt2x00usb_alloc_entries(struct data_queue *queue)
 {
+	struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
+	struct queue_entry_priv_usb *entry_priv;
+	struct queue_entry_priv_usb_bcn *bcn_priv;
 	unsigned int i;
 
+	for (i = 0; i < queue->limit; i++) {
+		entry_priv = queue->entries[i].priv_data;
+		entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!entry_priv->urb)
+			return -ENOMEM;
+	}
+
 	/*
-	 * Allocate the URB's
+	 * If this is not the beacon queue or
+	 * no guardian byte was required for the beacon,
+	 * then we are done.
 	 */
-	for (i = 0; i < ring->stats.limit; i++) {
-		ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
-		if (!ring->entry[i].priv)
+	if (queue->qid != QID_BEACON ||
+	    !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
+		return 0;
+
+	for (i = 0; i < queue->limit; i++) {
+		bcn_priv = queue->entries[i].priv_data;
+		bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!bcn_priv->guardian_urb)
 			return -ENOMEM;
 	}
 
 	return 0;
 }
 
-static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
-			       struct data_ring *ring)
+static void rt2x00usb_free_entries(struct data_queue *queue)
 {
+	struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
+	struct queue_entry_priv_usb *entry_priv;
+	struct queue_entry_priv_usb_bcn *bcn_priv;
 	unsigned int i;
 
-	if (!ring->entry)
+	if (!queue->entries)
 		return;
 
-	for (i = 0; i < ring->stats.limit; i++) {
-		usb_kill_urb(ring->entry[i].priv);
-		usb_free_urb(ring->entry[i].priv);
-		if (ring->entry[i].skb)
-			kfree_skb(ring->entry[i].skb);
+	for (i = 0; i < queue->limit; i++) {
+		entry_priv = queue->entries[i].priv_data;
+		usb_kill_urb(entry_priv->urb);
+		usb_free_urb(entry_priv->urb);
+	}
+
+	/*
+	 * If this is not the beacon queue or
+	 * no guardian byte was required for the beacon,
+	 * then we are done.
+	 */
+	if (queue->qid != QID_BEACON ||
+	    !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
+		return;
+
+	for (i = 0; i < queue->limit; i++) {
+		bcn_priv = queue->entries[i].priv_data;
+		usb_kill_urb(bcn_priv->guardian_urb);
+		usb_free_urb(bcn_priv->guardian_urb);
 	}
 }
 
 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 {
-	struct data_ring *ring;
-	struct sk_buff *skb;
-	unsigned int entry_size;
-	unsigned int i;
-	int uninitialized_var(status);
+	struct data_queue *queue;
+	int status;
 
 	/*
-	 * Allocate DMA
+	 * Find endpoints for each queue
 	 */
-	ring_for_each(rt2x00dev, ring) {
-		status = rt2x00usb_alloc_urb(rt2x00dev, ring);
-		if (status)
-			goto exit;
-	}
+	status = rt2x00usb_find_endpoints(rt2x00dev);
+	if (status)
+		goto exit;
 
 	/*
-	 * For the RX ring, skb's should be allocated.
+	 * Allocate DMA
 	 */
-	entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
-	for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
-		skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
-		if (!skb)
+	queue_for_each(rt2x00dev, queue) {
+		status = rt2x00usb_alloc_entries(queue);
+		if (status)
 			goto exit;
-
-		skb_reserve(skb, NET_IP_ALIGN);
-		skb_put(skb, entry_size);
-
-		rt2x00dev->rx->entry[i].skb = skb;
 	}
 
 	return 0;
@@ -456,10 +742,10 @@ EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 
 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 {
-	struct data_ring *ring;
+	struct data_queue *queue;
 
-	ring_for_each(rt2x00dev, ring)
-		rt2x00usb_free_urb(rt2x00dev, ring);
+	queue_for_each(rt2x00dev, queue)
+		rt2x00usb_free_entries(queue);
 }
 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 
@@ -474,14 +760,14 @@ static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 	kfree(rt2x00dev->eeprom);
 	rt2x00dev->eeprom = NULL;
 
-	kfree(rt2x00dev->csr_cache);
-	rt2x00dev->csr_cache = NULL;
+	kfree(rt2x00dev->csr.cache);
+	rt2x00dev->csr.cache = NULL;
 }
 
 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 {
-	rt2x00dev->csr_cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
-	if (!rt2x00dev->csr_cache)
+	rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
+	if (!rt2x00dev->csr.cache)
 		goto exit;
 
 	rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
@@ -495,7 +781,7 @@ static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 	return 0;
 
 exit:
-	ERROR_PROBE("Failed to allocate registers.\n");
+	rt2x00_probe_err("Failed to allocate registers\n");
 
 	rt2x00usb_free_reg(rt2x00dev);
 
@@ -503,19 +789,19 @@ exit:
 }
 
 int rt2x00usb_probe(struct usb_interface *usb_intf,
-		    const struct usb_device_id *id)
+		    const struct rt2x00_ops *ops)
 {
 	struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
-	struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 	struct ieee80211_hw *hw;
 	struct rt2x00_dev *rt2x00dev;
 	int retval;
 
 	usb_dev = usb_get_dev(usb_dev);
+	usb_reset_device(usb_dev);
 
 	hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 	if (!hw) {
-		ERROR_PROBE("Failed to allocate hardware.\n");
+		rt2x00_probe_err("Failed to allocate hardware\n");
 		retval = -ENOMEM;
 		goto exit_put_device;
 	}
@@ -523,15 +809,16 @@ int rt2x00usb_probe(struct usb_interface *usb_intf,
 	usb_set_intfdata(usb_intf, hw);
 
 	rt2x00dev = hw->priv;
-	rt2x00dev->dev = usb_intf;
+	rt2x00dev->dev = &usb_intf->dev;
 	rt2x00dev->ops = ops;
 	rt2x00dev->hw = hw;
-	mutex_init(&rt2x00dev->usb_cache_mutex);
 
-	rt2x00dev->usb_maxpacket =
-	    usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
-	if (!rt2x00dev->usb_maxpacket)
-		rt2x00dev->usb_maxpacket = 1;
+	rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
+
+	INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
+	INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
+	hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
+		     HRTIMER_MODE_REL);
 
 	retval = rt2x00usb_alloc_reg(rt2x00dev);
 	if (retval)
@@ -583,20 +870,8 @@ int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 {
 	struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 	struct rt2x00_dev *rt2x00dev = hw->priv;
-	int retval;
-
-	retval = rt2x00lib_suspend(rt2x00dev, state);
-	if (retval)
-		return retval;
 
-	rt2x00usb_free_reg(rt2x00dev);
-
-	/*
-	 * Decrease usbdev refcount.
-	 */
-	usb_put_dev(interface_to_usbdev(usb_intf));
-
-	return 0;
+	return rt2x00lib_suspend(rt2x00dev, state);
 }
 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 
@@ -604,32 +879,16 @@ int rt2x00usb_resume(struct usb_interface *usb_intf)
 {
 	struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 	struct rt2x00_dev *rt2x00dev = hw->priv;
-	int retval;
-
-	usb_get_dev(interface_to_usbdev(usb_intf));
 
-	retval = rt2x00usb_alloc_reg(rt2x00dev);
-	if (retval)
-		return retval;
-
-	retval = rt2x00lib_resume(rt2x00dev);
-	if (retval)
-		goto exit_free_reg;
-
-	return 0;
-
-exit_free_reg:
-	rt2x00usb_free_reg(rt2x00dev);
-
-	return retval;
+	return rt2x00lib_resume(rt2x00dev);
 }
 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 #endif /* CONFIG_PM */
 
 /*
- * rt2x00pci module information.
+ * rt2x00usb module information.
  */
 MODULE_AUTHOR(DRV_PROJECT);
 MODULE_VERSION(DRV_VERSION);
-MODULE_DESCRIPTION("rt2x00 library");
+MODULE_DESCRIPTION("rt2x00 usb library");
 MODULE_LICENSE("GPL");