[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / winbond / wb35rx.c

/*
 * ============================================================================
 *  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 */

	if (pWb35Rx->RxUrb)
		usb_free_urb(pWb35Rx->RxUrb);
	pr_debug("Wb35Rx_destroy OK\n");
}
Commit	Line	Data
6112fd6e LL	1	/*
	2	* ============================================================================
	3	* Copyright (c) 1996-2002 Winbond Electronic Corporation
	4	*
	5	* Module Name:
	6	* Wb35Rx.c
	7	*
	8	* Abstract:
	9	* Processing the Rx message from down layer
	10	*
	11	* ============================================================================
	12	*/
80aba536	13	#include <linux/usb.h>
5a0e3ad6	14	#include <linux/slab.h>
80aba536	15
7fff1316	16	#include "core.h"
80aba536	17	#include "wb35rx_f.h"
66101de1	18
c139a814	19	static void packet_came(struct ieee80211_hw hw, char pRxBufferAddress, int PacketSize)
66101de1	20	{
7fff1316	21	struct wbsoft_priv *priv = hw->priv;
c139a814 PE	22	struct sk_buff *skb;
c139a814 PE	23	struct ieee80211_rx_status rx_status = {0};
66101de1	24
c139a814 PE	25	if (!priv->enabled)
	26	return;
	27
	28	skb = dev_alloc_skb(PacketSize);
	29	if (!skb) {
	30	printk("Not enough memory for packet, FIXME\n");
	31	return;
	32	}
	33
6112fd6e	34	memcpy(skb_put(skb, PacketSize), pRxBufferAddress, PacketSize);
c139a814	35
f1d58c25 JB	36	memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
f1d58c25 JB	37	ieee80211_rx_irqsafe(hw, skb);
66101de1 PM	38	}
66101de1 PM	39
27d46421	40	static void Wb35Rx_adjust(struct wb35_descriptor *pRxDes)
c139a814	41	{
6112fd6e	42	u32 *pRxBufferAddress;
c139a814 PE	43	u32 DecryptionMethod;
	44	u32 i;
	45	u16 BufferSize;
	46
	47	DecryptionMethod = pRxDes->R01.R01_decryption_method;
	48	pRxBufferAddress = pRxDes->buffer_address[0];
	49	BufferSize = pRxDes->buffer_size[0];
	50
6112fd6e LL	51	/* Adjust the last part of data. Only data left */
6112fd6e LL	52	BufferSize -= 4; /* For CRC-32 */
c139a814 PE	53	if (DecryptionMethod)
c139a814 PE	54	BufferSize -= 4;
6112fd6e	55	if (DecryptionMethod == 3) /* For CCMP */
c139a814 PE	56	BufferSize -= 4;
c139a814 PE	57
6112fd6e LL	58	/* Adjust the IV field which after 802.11 header and ICV field. */
	59	if (DecryptionMethod == 1) { /* For WEP */
	60	for (i = 6; i > 0; i--)
	61	pRxBufferAddress[i] = pRxBufferAddress[i - 1];
c139a814	62	pRxDes->buffer_address[0] = pRxBufferAddress + 1;
6112fd6e LL	63	BufferSize -= 4; /* 4 byte for IV */
	64	} else if (DecryptionMethod) { /* For TKIP and CCMP */
	65	for (i = 7; i > 1; i--)
	66	pRxBufferAddress[i] = pRxBufferAddress[i - 2];
	67	pRxDes->buffer_address[0] = pRxBufferAddress + 2; /* Update the descriptor, shift 8 byte */
	68	BufferSize -= 8; /* 8 byte for IV + ICV */
c139a814 PE	69	}
	70	pRxDes->buffer_size[0] = BufferSize;
	71	}
	72
	73	static u16 Wb35Rx_indicate(struct ieee80211_hw *hw)
66101de1	74	{
6112fd6e LL	75	struct wbsoft_priv *priv = hw->priv;
6112fd6e LL	76	struct hw_data *pHwData = &priv->sHwData;
27d46421	77	struct wb35_descriptor RxDes;
6112fd6e LL	78	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
	79	u8 *pRxBufferAddress;
	80	u16 PacketSize;
	81	u16 stmp, BufferSize, stmp2 = 0;
	82	u32 RxBufferId;
66101de1	83
6112fd6e	84	/* Only one thread be allowed to run into the following */
c139a814 PE	85	do {
c139a814 PE	86	RxBufferId = pWb35Rx->RxProcessIndex;
6112fd6e	87	if (pWb35Rx->RxOwner[RxBufferId]) /* Owner by VM */
c139a814	88	break;
dc7e04fe	89
c139a814 PE	90	pWb35Rx->RxProcessIndex++;
c139a814 PE	91	pWb35Rx->RxProcessIndex %= MAX_USB_RX_BUFFER_NUMBER;
dc7e04fe	92
c139a814	93	pRxBufferAddress = pWb35Rx->pDRx;
6112fd6e	94	BufferSize = pWb35Rx->RxBufferSize[RxBufferId];
dc7e04fe	95
6112fd6e	96	/* Parse the bulkin buffer */
c139a814	97	while (BufferSize >= 4) {
6112fd6e	98	if ((cpu_to_le32((u32 )pRxBufferAddress) & 0x0fffffff) == RX_END_TAG) /* Is ending? */
c139a814	99	break;
dc7e04fe	100
6112fd6e	101	/* Get the R00 R01 first */
c139a814 PE	102	RxDes.R00.value = le32_to_cpu((u32 )pRxBufferAddress);
c139a814 PE	103	PacketSize = (u16)RxDes.R00.R00_receive_byte_count;
6112fd6e LL	104	RxDes.R01.value = le32_to_cpu(((u32 )(pRxBufferAddress + 4)));
6112fd6e LL	105	/* For new DMA 4k */
c139a814 PE	106	if ((PacketSize & 0x03) > 0)
c139a814 PE	107	PacketSize -= 4;
dc7e04fe	108
6112fd6e	109	/* Basic check for Rx length. Is length valid? */
c139a814	110	if (PacketSize > MAX_PACKET_SIZE) {
2855bb79	111	pr_debug("Serious ERROR : Rx data size too long, size =%d\n", PacketSize);
c139a814 PE	112	pWb35Rx->EP3vm_state = VM_STOP;
	113	pWb35Rx->Ep3ErrorCount2++;
	114	break;
	115	}
dc7e04fe	116
6112fd6e LL	117	/*
	118	* Wb35Rx_indicate() is called synchronously so it isn't
	119	* necessary to set "RxDes.Desctriptor_ID = RxBufferID;"
	120	*/
	121	BufferSize -= 8; /* subtract 8 byte for 35's USB header length */
c139a814	122	pRxBufferAddress += 8;
dc7e04fe	123
c139a814 PE	124	RxDes.buffer_address[0] = pRxBufferAddress;
	125	RxDes.buffer_size[0] = PacketSize;
	126	RxDes.buffer_number = 1;
	127	RxDes.buffer_start_index = 0;
	128	RxDes.buffer_total_size = RxDes.buffer_size[0];
	129	Wb35Rx_adjust(&RxDes);
dc7e04fe	130
c139a814	131	packet_came(hw, pRxBufferAddress, PacketSize);
dc7e04fe	132
6112fd6e	133	/* Move RxBuffer point to the next */
c139a814	134	stmp = PacketSize + 3;
6112fd6e	135	stmp &= ~0x03; /* 4n alignment */
c139a814 PE	136	pRxBufferAddress += stmp;
	137	BufferSize -= stmp;
	138	stmp2 += stmp;
	139	}
	140
6112fd6e LL	141	/* Reclaim resource */
6112fd6e LL	142	pWb35Rx->RxOwner[RxBufferId] = 1;
c139a814	143	} while (true);
c139a814	144	return stmp2;
66101de1 PM	145	}
66101de1 PM	146
c139a814 PE	147	static void Wb35Rx(struct ieee80211_hw *hw);
	148
	149	static void Wb35Rx_Complete(struct urb *urb)
66101de1	150	{
6112fd6e LL	151	struct ieee80211_hw *hw = urb->context;
	152	struct wbsoft_priv *priv = hw->priv;
	153	struct hw_data *pHwData = &priv->sHwData;
	154	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
	155	u8 *pRxBufferAddress;
	156	u32 SizeCheck;
	157	u16 BulkLength;
	158	u32 RxBufferId;
c4d562a9	159	struct R00_descriptor R00;
6112fd6e LL	160
6112fd6e LL	161	/* Variable setting */
66101de1	162	pWb35Rx->EP3vm_state = VM_COMPLETED;
6112fd6e	163	pWb35Rx->EP3VM_status = urb->status; /* Store the last result of Irp */
66101de1	164
dc7e04fe	165	RxBufferId = pWb35Rx->CurrentRxBufferId;
66101de1	166
dc7e04fe	167	pRxBufferAddress = pWb35Rx->pDRx;
a55a89b1	168	BulkLength = (u16)urb->actual_length;
66101de1	169
6112fd6e	170	/* The IRP is completed */
dc7e04fe	171	pWb35Rx->EP3vm_state = VM_COMPLETED;
66101de1	172
87cb9a63	173	if (pHwData->SurpriseRemove) /* Must be here, or RxBufferId is invalid */
dc7e04fe PE	174	goto error;
	175
	176	if (pWb35Rx->rx_halt)
	177	goto error;
	178
6112fd6e LL	179	/* Start to process the data only in successful condition */
6112fd6e LL	180	pWb35Rx->RxOwner[RxBufferId] = 0; /* Set the owner to driver */
dc7e04fe PE	181	R00.value = le32_to_cpu((u32 )pRxBufferAddress);
dc7e04fe PE	182
6112fd6e	183	/* The URB is completed, check the result */
dc7e04fe	184	if (pWb35Rx->EP3VM_status != 0) {
2855bb79	185	pr_debug("EP3 IoCompleteRoutine return error\n");
dc7e04fe PE	186	pWb35Rx->EP3vm_state = VM_STOP;
	187	goto error;
	188	}
	189
6112fd6e	190	/* For recovering. check if operating in single USB mode */
dc7e04fe	191	if (!HAL_USB_MODE_BURST(pHwData)) {
6112fd6e	192	SizeCheck = R00.R00_receive_byte_count;
dc7e04fe PE	193	if ((SizeCheck & 0x03) > 0)
	194	SizeCheck -= 4;
	195	SizeCheck = (SizeCheck + 3) & ~0x03;
6112fd6e	196	SizeCheck += 12; /* 8 + 4 badbeef */
dc7e04fe PE	197	if ((BulkLength > 1600) \|\|
	198	(SizeCheck > 1600) \|\|
	199	(BulkLength != SizeCheck) \|\|
6112fd6e	200	(BulkLength == 0)) { /* Add for fail Urb */
66101de1	201	pWb35Rx->EP3vm_state = VM_STOP;
dc7e04fe	202	pWb35Rx->Ep3ErrorCount2++;
66101de1	203	}
dc7e04fe	204	}
66101de1	205
6112fd6e	206	/* Indicating the receiving data */
dc7e04fe	207	pWb35Rx->ByteReceived += BulkLength;
6112fd6e	208	pWb35Rx->RxBufferSize[RxBufferId] = BulkLength;
66101de1	209
6112fd6e	210	if (!pWb35Rx->RxOwner[RxBufferId])
7fff1316	211	Wb35Rx_indicate(hw);
66101de1	212
dc7e04fe	213	kfree(pWb35Rx->pDRx);
6112fd6e	214	/* Do the next receive */
7fff1316	215	Wb35Rx(hw);
dc7e04fe	216	return;
66101de1	217
dc7e04fe	218	error:
6112fd6e	219	pWb35Rx->RxOwner[RxBufferId] = 1; /* Set the owner to hardware */
44e8541c	220	atomic_dec(&pWb35Rx->RxFireCounter);
66101de1 PM	221	pWb35Rx->EP3vm_state = VM_STOP;
	222	}
	223
6112fd6e	224	/* This function cannot reentrain */
c139a814	225	static void Wb35Rx(struct ieee80211_hw *hw)
66101de1	226	{
6112fd6e LL	227	struct wbsoft_priv *priv = hw->priv;
	228	struct hw_data *pHwData = &priv->sHwData;
	229	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
	230	u8 *pRxBufferAddress;
	231	struct urb *urb = pWb35Rx->RxUrb;
	232	int retv;
	233	u32 RxBufferId;
	234
	235	/* Issuing URB */
87cb9a63	236	if (pHwData->SurpriseRemove)
c139a814	237	goto error;
66101de1	238
c139a814 PE	239	if (pWb35Rx->rx_halt)
c139a814 PE	240	goto error;
66101de1	241
6112fd6e	242	/* Get RxBuffer's ID */
c139a814 PE	243	RxBufferId = pWb35Rx->RxBufferId;
c139a814 PE	244	if (!pWb35Rx->RxOwner[RxBufferId]) {
6112fd6e	245	/* It's impossible to run here. */
2855bb79	246	pr_debug("Rx driver fifo unavailable\n");
c139a814 PE	247	goto error;
	248	}
	249
6112fd6e	250	/* Update buffer point, then start to bulkin the data from USB */
c139a814 PE	251	pWb35Rx->RxBufferId++;
	252	pWb35Rx->RxBufferId %= MAX_USB_RX_BUFFER_NUMBER;
	253
	254	pWb35Rx->CurrentRxBufferId = RxBufferId;
	255
	256	pWb35Rx->pDRx = kzalloc(MAX_USB_RX_BUFFER, GFP_ATOMIC);
	257	if (!pWb35Rx->pDRx) {
	258	printk("w35und: Rx memory alloc failed\n");
	259	goto error;
	260	}
	261	pRxBufferAddress = pWb35Rx->pDRx;
	262
2894c6cd PE	263	usb_fill_bulk_urb(urb, pHwData->udev,
2894c6cd PE	264	usb_rcvbulkpipe(pHwData->udev, 3),
c139a814 PE	265	pRxBufferAddress, MAX_USB_RX_BUFFER,
	266	Wb35Rx_Complete, hw);
	267
	268	pWb35Rx->EP3vm_state = VM_RUNNING;
	269
	270	retv = usb_submit_urb(urb, GFP_ATOMIC);
	271
	272	if (retv != 0) {
	273	printk("Rx URB sending error\n");
	274	goto error;
66101de1	275	}
c139a814 PE	276	return;
	277
	278	error:
6112fd6e	279	/* VM stop */
c139a814 PE	280	pWb35Rx->EP3vm_state = VM_STOP;
c139a814 PE	281	atomic_dec(&pWb35Rx->RxFireCounter);
66101de1 PM	282	}
66101de1 PM	283
c139a814	284	void Wb35Rx_start(struct ieee80211_hw *hw)
66101de1	285	{
6112fd6e LL	286	struct wbsoft_priv *priv = hw->priv;
	287	struct hw_data *pHwData = &priv->sHwData;
	288	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
66101de1	289
6112fd6e	290	/* Allow only one thread to run into the Wb35Rx() function */
c139a814 PE	291	if (atomic_inc_return(&pWb35Rx->RxFireCounter) == 1) {
	292	pWb35Rx->EP3vm_state = VM_RUNNING;
	293	Wb35Rx(hw);
	294	} else
	295	atomic_dec(&pWb35Rx->RxFireCounter);
66101de1 PM	296	}
66101de1 PM	297
6112fd6e	298	static void Wb35Rx_reset_descriptor(struct hw_data *pHwData)
66101de1	299	{
6112fd6e LL	300	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
6112fd6e LL	301	u32 i;
66101de1 PM	302
	303	pWb35Rx->ByteReceived = 0;
	304	pWb35Rx->RxProcessIndex = 0;
	305	pWb35Rx->RxBufferId = 0;
	306	pWb35Rx->EP3vm_state = VM_STOP;
	307	pWb35Rx->rx_halt = 0;
	308
6112fd6e LL	309	/* Initial the Queue. The last buffer is reserved for used if the Rx resource is unavailable. */
6112fd6e LL	310	for (i = 0; i < MAX_USB_RX_BUFFER_NUMBER; i++)
66101de1 PM	311	pWb35Rx->RxOwner[i] = 1;
	312	}
	313
6112fd6e	314	unsigned char Wb35Rx_initial(struct hw_data *pHwData)
66101de1	315	{
eb62f3ea	316	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
66101de1	317
6112fd6e LL	318	/* Initial the Buffer Queue */
6112fd6e LL	319	Wb35Rx_reset_descriptor(pHwData);
66101de1	320
c139a814	321	pWb35Rx->RxUrb = usb_alloc_urb(0, GFP_ATOMIC);
6112fd6e	322	return !!pWb35Rx->RxUrb;
66101de1 PM	323	}
66101de1 PM	324
6112fd6e	325	void Wb35Rx_stop(struct hw_data *pHwData)
3cae503b	326	{
eb62f3ea	327	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
3cae503b	328
6112fd6e	329	/* Canceling the Irp if already sends it out. */
c139a814	330	if (pWb35Rx->EP3vm_state == VM_RUNNING) {
6112fd6e	331	usb_unlink_urb(pWb35Rx->RxUrb); /* Only use unlink, let Wb35Rx_destroy to free them */
2855bb79	332	pr_debug("EP3 Rx stop\n");
3cae503b	333	}
3cae503b	334	}
66101de1	335
6112fd6e LL	336	/* Needs process context */
6112fd6e LL	337	void Wb35Rx_destroy(struct hw_data *pHwData)
66101de1	338	{
eb62f3ea	339	struct wb35_rx *pWb35Rx = &pHwData->Wb35Rx;
66101de1	340
66101de1	341	do {
6112fd6e	342	msleep(10); /* Delay for waiting function enter */
c139a814	343	} while (pWb35Rx->EP3vm_state != VM_STOP);
6112fd6e	344	msleep(10); /* Delay for waiting function exit */
66101de1	345
c139a814	346	if (pWb35Rx->RxUrb)
6112fd6e	347	usb_free_urb(pWb35Rx->RxUrb);
2855bb79	348	pr_debug("Wb35Rx_destroy OK\n");
66101de1 PM	349	}
66101de1 PM	350