drivers/staging/winbond/wb35rx.c - linux - Git at Google

 /*
  * ============================================================================
  *  Copyright (c) 1996-2002 Winbond Electronic Corporation
  *
  *  Module Name:
  *    Wb35Rx.c
  *
  *  Abstract:
  *    Processing the Rx message from down layer
  *
  * ============================================================================
  */
 #include <linux/usb.h>
 #include <linux/slab.h>

 #include "core.h"
 #include "wb35rx_f.h"

 static void packet_came(struct ieee80211_hw *hw, char *pRxBufferAddress, int PacketSize)
 {
 	struct wbsoft_priv *priv = hw->priv;
 	struct sk_buff *skb;
 	struct ieee80211_rx_status rx_status = {0};

 	if (!priv->enabled)
 		return;

 	skb = dev_alloc_skb(PacketSize);
 	if (!skb) {
 		printk("Not enough memory for packet, FIXME\n");
 		return;
 	}

 	memcpy(skb_put(skb, PacketSize), pRxBufferAddress, PacketSize);

 	memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 	ieee80211_rx_irqsafe(hw, skb);
 }

 static void Wb35Rx_adjust(struct wb35_descriptor *pRxDes)
 {
 	u32	*pRxBufferAddress;
 	u32	DecryptionMethod;
 	u32	i;
 	u16	BufferSize;

 	DecryptionMethod = pRxDes->R01.R01_decryption_method;
 	pRxBufferAddress = pRxDes->buffer_address[0];
 	BufferSize = pRxDes->buffer_size[0];

 	/* Adjust the last part of data. Only data left */
 	BufferSize -= 4; /* For CRC-32 */
 	if (DecryptionMethod)
 		BufferSize -= 4;
 	if (DecryptionMethod == 3) /* For CCMP */
 		BufferSize -= 4;

 	/* Adjust the IV field which after 802.11 header and ICV field. */
 	if (DecryptionMethod == 1) { /* For WEP */
 		for (i = 6; i > 0; i--)
 			pRxBufferAddress[i] = pRxBufferAddress[i - 1];
 		pRxDes->buffer_address[0] = pRxBufferAddress + 1;
 		BufferSize -= 4; /* 4 byte for IV */
 	} else if (DecryptionMethod) { /* For TKIP and CCMP */
 		for (i = 7; i > 1; i--)
 			pRxBufferAddress[i] = pRxBufferAddress[i - 2];
 		pRxDes->buffer_address[0] = pRxBufferAddress + 2; /* Update the descriptor, shift 8 byte */
 		BufferSize -= 8; /* 8 byte for IV + ICV */
 	}
 	pRxDes->buffer_size[0] = BufferSize;
 }

 static u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
 {
 	struct wbsoft_priv	*priv = hw->priv;
 	struct hw_data		*pHwData = &priv->sHwData;
 	struct wb35_descriptor	RxDes;
 	struct wb35_rx		*pWb35Rx = &pHwData->Wb35Rx;
 	u8			*pRxBufferAddress;
 	u16			PacketSize;
 	u16			stmp, BufferSize, stmp2 = 0;
 	u32			RxBufferId;

 	/* Only one thread be allowed to run into the following */
 	do {
 		RxBufferId = pWb35Rx->RxProcessIndex;
 		if (pWb35Rx->RxOwner[RxBufferId]) /* Owner by VM */
 			break;

 		pWb35Rx->RxProcessIndex++;
 		pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;

 		pRxBufferAddress = pWb35Rx->pDRx;
 		BufferSize = pWb35Rx->RxBufferSize[RxBufferId];

 		/* Parse the bulkin buffer */
 		while (BufferSize >= 4) {
 			if ((cpu_to_le32(*(u32 *)pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) /* Is ending? */
 				break;

 			/* Get the R00 R01 first */
 			RxDes.R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);
 			PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
 			RxDes.R01.value = le32_to_cpu(*((u32 *)(pRxBufferAddress + 4)));
 			/* For new DMA 4k */
 			if ((PacketSize & 0x03) > 0)
 				PacketSize -= 4;

 			/* Basic check for Rx length. Is length valid? */
 			if (PacketSize > MAX_PACKET_SIZE) {
 				pr_debug("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
 				pWb35Rx->EP3vm_state = VM_STOP;
 				pWb35Rx->Ep3ErrorCount2++;
 				break;
 			}

 			/*
 			 * Wb35Rx_indicate() is called synchronously so it isn't
 			 * necessary to set "RxDes.Desctriptor_ID = RxBufferID;"
 			 */
 			BufferSize -= 8; /* subtract 8 byte for 35's USB header length */
 			pRxBufferAddress += 8;

 			RxDes.buffer_address[0] = pRxBufferAddress;
 			RxDes.buffer_size[0] = PacketSize;
 			RxDes.buffer_number = 1;
 			RxDes.buffer_start_index = 0;
 			RxDes.buffer_total_size = RxDes.buffer_size[0];
 			Wb35Rx_adjust(&RxDes);

 			packet_came(hw, pRxBufferAddress, PacketSize);

 			/* Move RxBuffer point to the next */
 			stmp = PacketSize + 3;
 			stmp &= ~0x03; /* 4n alignment */
 			pRxBufferAddress += stmp;
 			BufferSize -= stmp;
 			stmp2 += stmp;
 		}

 		/* Reclaim resource */
 		pWb35Rx->RxOwner[RxBufferId] = 1;
 	} while (true);
 	return stmp2;
 }

 static void Wb35Rx(struct ieee80211_hw *hw);

 static void Wb35Rx_Complete(struct urb *urb)
 {
 	struct ieee80211_hw	*hw = urb->context;
 	struct wbsoft_priv	*priv = hw->priv;
 	struct hw_data		*pHwData = &priv->sHwData;
 	struct wb35_rx		*pWb35Rx = &pHwData->Wb35Rx;
 	u8			*pRxBufferAddress;
 	u32			SizeCheck;
 	u16			BulkLength;
 	u32			RxBufferId;
 	struct R00_descriptor		R00;

 	/* Variable setting */
 	pWb35Rx->EP3vm_state = VM_COMPLETED;
 	pWb35Rx->EP3VM_status = urb->status; /* Store the last result of Irp */

 	RxBufferId = pWb35Rx->CurrentRxBufferId;

 	pRxBufferAddress = pWb35Rx->pDRx;
 	BulkLength = (u16)urb->actual_length;

 	/* The IRP is completed */
 	pWb35Rx->EP3vm_state = VM_COMPLETED;

 	if (pHwData->SurpriseRemove) /* Must be here, or RxBufferId is invalid */
 		goto error;

 	if (pWb35Rx->rx_halt)
 		goto error;

 	/* Start to process the data only in successful condition */
 	pWb35Rx->RxOwner[RxBufferId] = 0; /* Set the owner to driver */
 	R00.value = le32_to_cpu(*(u32 *)pRxBufferAddress);

 	/* The URB is completed, check the result */
 	if (pWb35Rx->EP3VM_status != 0) {
 		pr_debug("EP3 IoCompleteRoutine return error\n");
 		pWb35Rx->EP3vm_state = VM_STOP;
 		goto error;
 	}

 	/* For recovering. check if operating in single USB mode */
 	if (!HAL_USB_MODE_BURST(pHwData)) {
 		SizeCheck = R00.R00_receive_byte_count;
 		if ((SizeCheck & 0x03) > 0)
 			SizeCheck -= 4;
 		SizeCheck = (SizeCheck + 3) & ~0x03;
 		SizeCheck += 12; /* 8 + 4 badbeef */
 		if ((BulkLength > 1600) ||
 			(SizeCheck > 1600) ||
 			(BulkLength != SizeCheck) ||
 			(BulkLength == 0)) { /* Add for fail Urb */
 			pWb35Rx->EP3vm_state = VM_STOP;
 			pWb35Rx->Ep3ErrorCount2++;
 		}
 	}

 	/* Indicating the receiving data */
 	pWb35Rx->ByteReceived += BulkLength;
 	pWb35Rx->RxBufferSize[RxBufferId] = BulkLength;

 	if (!pWb35Rx->RxOwner[RxBufferId])
 		Wb35Rx_indicate(hw);

 	kfree(pWb35Rx->pDRx);
 	/* Do the next receive */
 	Wb35Rx(hw);
 	return;

 error:
 	pWb35Rx->RxOwner[RxBufferId] = 1; /* Set the owner to hardware */
 	atomic_dec(&pWb35Rx->RxFireCounter);
 	pWb35Rx->EP3vm_state = VM_STOP;
 }

 /* This function cannot reentrain */
 static void Wb35Rx(struct ieee80211_hw *hw)
 {
 	struct wbsoft_priv	*priv = hw->priv;
 	struct hw_data		*pHwData = &priv->sHwData;
 	struct wb35_rx		*pWb35Rx = &pHwData->Wb35Rx;
 	u8			*pRxBufferAddress;
 	struct urb		*urb = pWb35Rx->RxUrb;
 	int			retv;
 	u32			RxBufferId;

 	/* Issuing URB */
 	if (pHwData->SurpriseRemove)
 		goto error;

 	if (pWb35Rx->rx_halt)
 		goto error;

 	/* Get RxBuffer's ID */
 	RxBufferId = pWb35Rx->RxBufferId;
 	if (!pWb35Rx->RxOwner[RxBufferId]) {
 		/* It's impossible to run here. */
 		pr_debug("Rx driver fifo unavailable\n");
 		goto error;
 	}

 	/* Update buffer point, then start to bulkin the data from USB */
 	pWb35Rx->RxBufferId++;
 	pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;

 	pWb35Rx->CurrentRxBufferId = RxBufferId;

 	pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
 	if (!pWb35Rx->pDRx) {
 		printk("w35und: Rx memory alloc failed\n");
 		goto error;
 	}
 	pRxBufferAddress = pWb35Rx->pDRx;

 	usb_fill_bulk_urb(urb, pHwData->udev,
 			  usb_rcvbulkpipe(pHwData->udev, 3),
 			  pRxBufferAddress, MAX_USB_RX_BUFFER,
 			  Wb35Rx_Complete, hw);

 	pWb35Rx->EP3vm_state = VM_RUNNING;

 	retv = usb_submit_urb(urb, GFP_ATOMIC);

 	if (retv != 0) {
 		printk("Rx URB sending error\n");
 		goto error;
 	}
 	return;

 error:
 	/* VM stop */
 	pWb35Rx->EP3vm_state = VM_STOP;
 	atomic_dec(&pWb35Rx->RxFireCounter);
 }

 void Wb35Rx_start(struct ieee80211_hw *hw)
 {
 	struct wbsoft_priv	*priv = hw->priv;
 	struct hw_data		*pHwData = &priv->sHwData;
 	struct wb35_rx		*pWb35Rx = &pHwData->Wb35Rx;

 	/* Allow only one thread to run into the Wb35Rx() function */
 	if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
 		pWb35Rx->EP3vm_state = VM_RUNNING;
 		Wb35Rx(hw);
 	} else
 		atomic_dec(&pWb35Rx->RxFireCounter);
 }

 static void Wb35Rx_reset_descriptor(struct hw_data *pHwData)
 {
 	struct wb35_rx	*pWb35Rx = &pHwData->Wb35Rx;
 	u32		i;

 	pWb35Rx->ByteReceived = 0;
 	pWb35Rx->RxProcessIndex = 0;
 	pWb35Rx->RxBufferId = 0;
 	pWb35Rx->EP3vm_state = VM_STOP;
 	pWb35Rx->rx_halt = 0;

 	/* Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable. */
 	for (i = 0; i < MAX_USB_RX_BUFFER_NUMBER; i++)
 		pWb35Rx->RxOwner[i] = 1;
 }

 unsigned char Wb35Rx_initial(struct hw_data *pHwData)
 {
 	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;

 	/* Initial the Buffer Queue */
 	Wb35Rx_reset_descriptor(pHwData);

 	pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
 	return !!pWb35Rx->RxUrb;
 }

 void Wb35Rx_stop(struct hw_data *pHwData)
 {
 	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;

 	/* Canceling the Irp if already sends it out. */
 	if (pWb35Rx->EP3vm_state == VM_RUNNING) {
 		usb_unlink_urb(pWb35Rx->RxUrb); /* Only use unlink, let Wb35Rx_destroy to free them */
 		pr_debug("EP3 Rx stop\n");
 	}
 }

 /* Needs process context */
 void Wb35Rx_destroy(struct hw_data *pHwData)
 {
 	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;

 	do {
 		msleep(10); /* Delay for waiting function enter */
 	} while (pWb35Rx->EP3vm_state != VM_STOP);
 	msleep(10); /* Delay for waiting function exit */

 	usb_free_urb(pWb35Rx->RxUrb);
 	pr_debug("Wb35Rx_destroy OK\n");
 }
	/*
	* ============================================================================
	* Copyright (c) 1996-2002 Winbond Electronic Corporation
	*
	* Module Name:
	* Wb35Rx.c
	*
	* Abstract:
	* Processing the Rx message from down layer
	*
	* ============================================================================
	*/
	#include <linux/usb.h>
	#include <linux/slab.h>

	#include "core.h"
	#include "wb35rx_f.h"

	static void packet_came(struct ieee80211_hw hw, char pRxBufferAddress, int PacketSize)
	{
	struct wbsoft_priv *priv = hw->priv;
	struct sk_buff *skb;
	struct ieee80211_rx_status rx_status = {0};

	if (!priv->enabled)
	return;

	skb = dev_alloc_skb(PacketSize);
	if (!skb) {
	printk("Not enough memory for packet, FIXME\n");
	return;
	}

	memcpy(skb_put(skb, PacketSize), pRxBufferAddress, PacketSize);

	memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
	ieee80211_rx_irqsafe(hw, skb);
	}

	static void Wb35Rx_adjust(struct wb35_descriptor *pRxDes)
	{
	u32 *pRxBufferAddress;
	u32 DecryptionMethod;
	u32 i;
	u16 BufferSize;

	DecryptionMethod = pRxDes->R01.R01_decryption_method;
	pRxBufferAddress = pRxDes->buffer_address[0];
	BufferSize = pRxDes->buffer_size[0];

	/* Adjust the last part of data. Only data left */
	BufferSize -= 4; /* For CRC-32 */
	if (DecryptionMethod)
	BufferSize -= 4;
	if (DecryptionMethod == 3) /* For CCMP */
	BufferSize -= 4;

	/* Adjust the IV field which after 802.11 header and ICV field. */
	if (DecryptionMethod == 1) { /* For WEP */
	for (i = 6; i > 0; i--)
	pRxBufferAddress[i] = pRxBufferAddress[i - 1];
	pRxDes->buffer_address[0] = pRxBufferAddress + 1;
	BufferSize -= 4; /* 4 byte for IV */
	} else if (DecryptionMethod) { /* For TKIP and CCMP */
	for (i = 7; i > 1; i--)
	pRxBufferAddress[i] = pRxBufferAddress[i - 2];
	pRxDes->buffer_address[0] = pRxBufferAddress + 2; /* Update the descriptor, shift 8 byte */
	BufferSize -= 8; /* 8 byte for IV + ICV */
	}
	pRxDes->buffer_size[0] = BufferSize;
	}

	static u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
	{
	struct wbsoft_priv *priv = hw->priv;
	struct hw_data *pHwData = &priv->sHwData;
	struct wb35_descriptor RxDes;
	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
	u8 *pRxBufferAddress;
	u16 PacketSize;
	u16 stmp, BufferSize, stmp2 = 0;
	u32 RxBufferId;

	/* Only one thread be allowed to run into the following */
	do {
	RxBufferId = pWb35Rx->RxProcessIndex;
	if (pWb35Rx->RxOwner[RxBufferId]) /* Owner by VM */
	break;

	pWb35Rx->RxProcessIndex++;
	pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;

	pRxBufferAddress = pWb35Rx->pDRx;
	BufferSize = pWb35Rx->RxBufferSize[RxBufferId];

	/* Parse the bulkin buffer */
	while (BufferSize >= 4) {
	if ((cpu_to_le32((u32 )pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) /* Is ending? */
	break;

	/* Get the R00 R01 first */
	RxDes.R00.value = le32_to_cpu((u32 )pRxBufferAddress);
	PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
	RxDes.R01.value = le32_to_cpu(((u32 )(pRxBufferAddress + 4)));
	/* For new DMA 4k */
	if ((PacketSize & 0x03) > 0)
	PacketSize -= 4;

	/* Basic check for Rx length. Is length valid? */
	if (PacketSize > MAX_PACKET_SIZE) {
	pr_debug("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
	pWb35Rx->EP3vm_state = VM_STOP;
	pWb35Rx->Ep3ErrorCount2++;
	break;
	}

	/*
	* Wb35Rx_indicate() is called synchronously so it isn't
	* necessary to set "RxDes.Desctriptor_ID = RxBufferID;"
	*/
	BufferSize -= 8; /* subtract 8 byte for 35's USB header length */
	pRxBufferAddress += 8;

	RxDes.buffer_address[0] = pRxBufferAddress;
	RxDes.buffer_size[0] = PacketSize;
	RxDes.buffer_number = 1;
	RxDes.buffer_start_index = 0;
	RxDes.buffer_total_size = RxDes.buffer_size[0];
	Wb35Rx_adjust(&RxDes);

	packet_came(hw, pRxBufferAddress, PacketSize);

	/* Move RxBuffer point to the next */
	stmp = PacketSize + 3;
	stmp &= ~0x03; /* 4n alignment */
	pRxBufferAddress += stmp;
	BufferSize -= stmp;
	stmp2 += stmp;
	}

	/* Reclaim resource */
	pWb35Rx->RxOwner[RxBufferId] = 1;
	} while (true);
	return stmp2;
	}

	static void Wb35Rx(struct ieee80211_hw *hw);

	static void Wb35Rx_Complete(struct urb *urb)
	{
	struct ieee80211_hw *hw = urb->context;
	struct wbsoft_priv *priv = hw->priv;
	struct hw_data *pHwData = &priv->sHwData;
	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
	u8 *pRxBufferAddress;
	u32 SizeCheck;
	u16 BulkLength;
	u32 RxBufferId;
	struct R00_descriptor R00;

	/* Variable setting */
	pWb35Rx->EP3vm_state = VM_COMPLETED;
	pWb35Rx->EP3VM_status = urb->status; /* Store the last result of Irp */

	RxBufferId = pWb35Rx->CurrentRxBufferId;

	pRxBufferAddress = pWb35Rx->pDRx;
	BulkLength = (u16)urb->actual_length;

	/* The IRP is completed */
	pWb35Rx->EP3vm_state = VM_COMPLETED;

	if (pHwData->SurpriseRemove) /* Must be here, or RxBufferId is invalid */
	goto error;

	if (pWb35Rx->rx_halt)
	goto error;

	/* Start to process the data only in successful condition */
	pWb35Rx->RxOwner[RxBufferId] = 0; /* Set the owner to driver */
	R00.value = le32_to_cpu((u32 )pRxBufferAddress);

	/* The URB is completed, check the result */
	if (pWb35Rx->EP3VM_status != 0) {
	pr_debug("EP3 IoCompleteRoutine return error\n");
	pWb35Rx->EP3vm_state = VM_STOP;
	goto error;
	}

	/* For recovering. check if operating in single USB mode */
	if (!HAL_USB_MODE_BURST(pHwData)) {
	SizeCheck = R00.R00_receive_byte_count;
	if ((SizeCheck & 0x03) > 0)
	SizeCheck -= 4;
	SizeCheck = (SizeCheck + 3) & ~0x03;
	SizeCheck += 12; /* 8 + 4 badbeef */
	if ((BulkLength > 1600) \|\|
	(SizeCheck > 1600) \|\|
	(BulkLength != SizeCheck) \|\|
	(BulkLength == 0)) { /* Add for fail Urb */
	pWb35Rx->EP3vm_state = VM_STOP;
	pWb35Rx->Ep3ErrorCount2++;
	}
	}

	/* Indicating the receiving data */
	pWb35Rx->ByteReceived += BulkLength;
	pWb35Rx->RxBufferSize[RxBufferId] = BulkLength;

	if (!pWb35Rx->RxOwner[RxBufferId])
	Wb35Rx_indicate(hw);

	kfree(pWb35Rx->pDRx);
	/* Do the next receive */
	Wb35Rx(hw);
	return;

	error:
	pWb35Rx->RxOwner[RxBufferId] = 1; /* Set the owner to hardware */
	atomic_dec(&pWb35Rx->RxFireCounter);
	pWb35Rx->EP3vm_state = VM_STOP;
	}

	/* This function cannot reentrain */
	static void Wb35Rx(struct ieee80211_hw *hw)
	{
	struct wbsoft_priv *priv = hw->priv;
	struct hw_data *pHwData = &priv->sHwData;
	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
	u8 *pRxBufferAddress;
	struct urb *urb = pWb35Rx->RxUrb;
	int retv;
	u32 RxBufferId;

	/* Issuing URB */
	if (pHwData->SurpriseRemove)
	goto error;

	if (pWb35Rx->rx_halt)
	goto error;

	/* Get RxBuffer's ID */
	RxBufferId = pWb35Rx->RxBufferId;
	if (!pWb35Rx->RxOwner[RxBufferId]) {
	/* It's impossible to run here. */
	pr_debug("Rx driver fifo unavailable\n");
	goto error;
	}

	/* Update buffer point, then start to bulkin the data from USB */
	pWb35Rx->RxBufferId++;
	pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;

	pWb35Rx->CurrentRxBufferId = RxBufferId;

	pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
	if (!pWb35Rx->pDRx) {
	printk("w35und: Rx memory alloc failed\n");
	goto error;
	}
	pRxBufferAddress = pWb35Rx->pDRx;

	usb_fill_bulk_urb(urb, pHwData->udev,
	usb_rcvbulkpipe(pHwData->udev, 3),
	pRxBufferAddress, MAX_USB_RX_BUFFER,
	Wb35Rx_Complete, hw);

	pWb35Rx->EP3vm_state = VM_RUNNING;

	retv = usb_submit_urb(urb, GFP_ATOMIC);

	if (retv != 0) {
	printk("Rx URB sending error\n");
	goto error;
	}
	return;

	error:
	/* VM stop */
	pWb35Rx->EP3vm_state = VM_STOP;
	atomic_dec(&pWb35Rx->RxFireCounter);
	}

	void Wb35Rx_start(struct ieee80211_hw *hw)
	{
	struct wbsoft_priv *priv = hw->priv;
	struct hw_data *pHwData = &priv->sHwData;
	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;

	/* Allow only one thread to run into the Wb35Rx() function */
	if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
	pWb35Rx->EP3vm_state = VM_RUNNING;
	Wb35Rx(hw);
	} else
	atomic_dec(&pWb35Rx->RxFireCounter);
	}

	static void Wb35Rx_reset_descriptor(struct hw_data *pHwData)
	{
	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
	u32 i;

	pWb35Rx->ByteReceived = 0;
	pWb35Rx->RxProcessIndex = 0;
	pWb35Rx->RxBufferId = 0;
	pWb35Rx->EP3vm_state = VM_STOP;
	pWb35Rx->rx_halt = 0;

	/* Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable. */
	for (i = 0; i < MAX_USB_RX_BUFFER_NUMBER; i++)
	pWb35Rx->RxOwner[i] = 1;
	}

	unsigned char Wb35Rx_initial(struct hw_data *pHwData)
	{
	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;

	/* Initial the Buffer Queue */
	Wb35Rx_reset_descriptor(pHwData);

	pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
	return !!pWb35Rx->RxUrb;
	}

	void Wb35Rx_stop(struct hw_data *pHwData)
	{
	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;

	/* Canceling the Irp if already sends it out. */
	if (pWb35Rx->EP3vm_state == VM_RUNNING) {
	usb_unlink_urb(pWb35Rx->RxUrb); /* Only use unlink, let Wb35Rx_destroy to free them */
	pr_debug("EP3 Rx stop\n");
	}
	}

	/* Needs process context */
	void Wb35Rx_destroy(struct hw_data *pHwData)
	{
	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;

	do {
	msleep(10); /* Delay for waiting function enter */
	} while (pWb35Rx->EP3vm_state != VM_STOP);
	msleep(10); /* Delay for waiting function exit */

	usb_free_urb(pWb35Rx->RxUrb);
	pr_debug("Wb35Rx_destroy OK\n");
	}