1. 根目录:
2. drivers
3. staging
4. bcm
5. InterfaceTx.c

#include "headers.h"

/*this is transmit call-back(BULK OUT)*/
static void write_bulk_callback(struct urb *urb/*, struct pt_regs *regs*/)
{
	struct bcm_usb_tcb *pTcb = (struct bcm_usb_tcb *)urb->context;
	struct bcm_interface_adapter *psIntfAdapter = pTcb->psIntfAdapter;
	struct bcm_link_request *pControlMsg = (struct bcm_link_request *)urb->transfer_buffer;
	struct bcm_mini_adapter *psAdapter = psIntfAdapter->psAdapter;
	bool bpowerDownMsg = false;
	struct bcm_mini_adapter *Adapter = GET_BCM_ADAPTER(gblpnetdev);

	if (unlikely(netif_msg_tx_done(Adapter)))
		pr_info(PFX "%s: transmit status %d\n", Adapter->dev->name, urb->status);

	if (urb->status != STATUS_SUCCESS) {
		if (urb->status == -EPIPE) {
			psIntfAdapter->psAdapter->bEndPointHalted = TRUE;
			wake_up(&psIntfAdapter->psAdapter->tx_packet_wait_queue);
		} else {
			BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "Tx URB has got cancelled. status :%d", urb->status);
		}
	}

	pTcb->bUsed = false;
	atomic_dec(&psIntfAdapter->uNumTcbUsed);



	if (TRUE == psAdapter->bPreparingForLowPowerMode) {

		if (((pControlMsg->szData[0] == GO_TO_IDLE_MODE_PAYLOAD) &&
			(pControlMsg->szData[1] == TARGET_CAN_GO_TO_IDLE_MODE))) {
			bpowerDownMsg = TRUE;
			/* This covers the bus err while Idle Request msg sent down. */
			if (urb->status != STATUS_SUCCESS) {
				psAdapter->bPreparingForLowPowerMode = false;
				BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "Idle Mode Request msg failed to reach to Modem");
				/* Signalling the cntrl pkt path in Ioctl */
				wake_up(&psAdapter->lowpower_mode_wait_queue);
				StartInterruptUrb(psIntfAdapter);
				goto err_exit;
			}

			if (psAdapter->bDoSuspend == false) {
				psAdapter->IdleMode = TRUE;
				/* since going in Idle mode completed hence making this var false */
				psAdapter->bPreparingForLowPowerMode = false;

				BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "Host Entered in Idle Mode State...");
				/* Signalling the cntrl pkt path in Ioctl*/
				wake_up(&psAdapter->lowpower_mode_wait_queue);
			}

		} else if ((pControlMsg->Leader.Status == LINK_UP_CONTROL_REQ) &&
			(pControlMsg->szData[0] == LINK_UP_ACK) &&
			(pControlMsg->szData[1] == LINK_SHUTDOWN_REQ_FROM_FIRMWARE)  &&
			(pControlMsg->szData[2] == SHUTDOWN_ACK_FROM_DRIVER)) {
			/* This covers the bus err while shutdown Request msg sent down. */
			if (urb->status != STATUS_SUCCESS) {
				psAdapter->bPreparingForLowPowerMode = false;
				BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "Shutdown Request Msg failed to reach to Modem");
				/* Signalling the cntrl pkt path in Ioctl */
				wake_up(&psAdapter->lowpower_mode_wait_queue);
				StartInterruptUrb(psIntfAdapter);
				goto err_exit;
			}

			bpowerDownMsg = TRUE;
			if (psAdapter->bDoSuspend == false) {
				psAdapter->bShutStatus = TRUE;
				/* since going in shutdown mode completed hence making this var false */
				psAdapter->bPreparingForLowPowerMode = false;
				BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "Host Entered in shutdown Mode State...");
				/* Signalling the cntrl pkt path in Ioctl */
				wake_up(&psAdapter->lowpower_mode_wait_queue);
			}
		}

		if (psAdapter->bDoSuspend && bpowerDownMsg) {
			/* issuing bus suspend request */
			BCM_DEBUG_PRINT(Adapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "Issuing the Bus suspend request to USB stack");
			psIntfAdapter->bPreparingForBusSuspend = TRUE;
			schedule_work(&psIntfAdapter->usbSuspendWork);

		}

	}

err_exit:
	usb_free_coherent(urb->dev, urb->transfer_buffer_length,
			urb->transfer_buffer, urb->transfer_dma);
}


static struct bcm_usb_tcb *GetBulkOutTcb(struct bcm_interface_adapter *psIntfAdapter)
{
	struct bcm_usb_tcb *pTcb = NULL;
	UINT index = 0;

	if ((atomic_read(&psIntfAdapter->uNumTcbUsed) < MAXIMUM_USB_TCB) &&
		(psIntfAdapter->psAdapter->StopAllXaction == false)) {
		index = atomic_read(&psIntfAdapter->uCurrTcb);
		pTcb = &psIntfAdapter->asUsbTcb[index];
		pTcb->bUsed = TRUE;
		pTcb->psIntfAdapter = psIntfAdapter;
		BCM_DEBUG_PRINT(psIntfAdapter->psAdapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "Got Tx desc %d used %d",
			index, atomic_read(&psIntfAdapter->uNumTcbUsed));
		index = (index + 1) % MAXIMUM_USB_TCB;
		atomic_set(&psIntfAdapter->uCurrTcb, index);
		atomic_inc(&psIntfAdapter->uNumTcbUsed);
	}
	return pTcb;
}

static int TransmitTcb(struct bcm_interface_adapter *psIntfAdapter, struct bcm_usb_tcb *pTcb, PVOID data, int len)
{

	struct urb *urb = pTcb->urb;
	int retval = 0;

	urb->transfer_buffer = usb_alloc_coherent(psIntfAdapter->udev, len,
						GFP_ATOMIC, &urb->transfer_dma);
	if (!urb->transfer_buffer) {
		BCM_DEBUG_PRINT(psIntfAdapter->psAdapter, DBG_TYPE_PRINTK, 0, 0, "Error allocating memory\n");
		return  -ENOMEM;
	}
	memcpy(urb->transfer_buffer, data, len);
	urb->transfer_buffer_length = len;

	BCM_DEBUG_PRINT(psIntfAdapter->psAdapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "Sending Bulk out packet\n");
	/* For T3B,INT OUT end point will be used as bulk out end point */
	if ((psIntfAdapter->psAdapter->chip_id == T3B) && (psIntfAdapter->bHighSpeedDevice == TRUE)) {
		usb_fill_int_urb(urb, psIntfAdapter->udev,
			psIntfAdapter->sBulkOut.bulk_out_pipe,
			urb->transfer_buffer, len, write_bulk_callback, pTcb,
			psIntfAdapter->sBulkOut.int_out_interval);
	} else {
	usb_fill_bulk_urb(urb, psIntfAdapter->udev,
		  psIntfAdapter->sBulkOut.bulk_out_pipe,
		  urb->transfer_buffer, len, write_bulk_callback, pTcb);
	}
	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; /* For DMA transfer */

	if (false == psIntfAdapter->psAdapter->device_removed &&
	   false == psIntfAdapter->psAdapter->bEndPointHalted &&
	   false == psIntfAdapter->bSuspended &&
	   false == psIntfAdapter->bPreparingForBusSuspend) {
		retval = usb_submit_urb(urb, GFP_ATOMIC);
		if (retval) {
			BCM_DEBUG_PRINT(psIntfAdapter->psAdapter, DBG_TYPE_TX, NEXT_SEND, DBG_LVL_ALL, "failed submitting write urb, error %d", retval);
			if (retval == -EPIPE) {
				psIntfAdapter->psAdapter->bEndPointHalted = TRUE;
				wake_up(&psIntfAdapter->psAdapter->tx_packet_wait_queue);
			}
		}
	}
	return retval;
}

int InterfaceTransmitPacket(PVOID arg, PVOID data, UINT len)
{
	struct bcm_usb_tcb *pTcb = NULL;

	struct bcm_interface_adapter *psIntfAdapter = arg;
	pTcb = GetBulkOutTcb(psIntfAdapter);
	if (pTcb == NULL) {
		BCM_DEBUG_PRINT(psIntfAdapter->psAdapter, DBG_TYPE_PRINTK, 0, 0, "No URB to transmit packet, dropping packet");
		return -EFAULT;
	}
	return TransmitTcb(psIntfAdapter, pTcb, data, len);
}