usbacm_drv.c

mtk 6225平台的usb程序！ 对想了解mtk平台usb的朋友会有帮助！

/*****************************************************************************
*  Copyright Statement:
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*  THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
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/*****************************************************************************
 *
 * Filename:
 * ---------
 *    usbacm_drv.c
 *
 * Project:
 * --------
 *   Maui_Software
 *
 * Description:
 * ------------
 *   This file implements usb CDC ACM class driver
 *
 * Author:
 * -------
 * -------
 * -------
 *
 *============================================================================
 *             HISTORY
 * Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
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#include "stack_common.h"
#include 	"stack_msgs.h"
#include "drv_comm.h"
#include "gpt_sw.h"

#include "usb_comm.h"
#include "usb_drv.h"
#include "usb.h"
#include "usb_resource.h"
#include "usbacm_drv.h"
#include "usbacm_adap.h"
#include "usb_custom.h"

/* global variables */
UARTStruct USB2UARTPort;
UsbAcm_Struct g_UsbACM;

#ifdef __INTERRUPT_TEST__
static kal_bool g_usb_intr_enable = KAL_TRUE;
#endif

/* Exception flag */
extern kal_uint8 INT_Exception_Enter; 

/* for DMA tx buffer and tx_isr buffer to differentiate */
static USBTRX_MEM_TYPE USB2Uart_MemType;
static kal_uint32  USB2Uart_WriteLength;

/* static functions */
static kal_uint32 USB2UART_Check_Transmit_Data(kal_uint32* addr, kal_bool b_check);
static void USB2UART_Update_Transmit_Data(void);
static void USB2UART_Tx_DMA_Callback(void);
static void USB_Acm_Break_Timeout(void *parameter);
static void USB_Acm_Ring_Buffer_Timeout(void *parameter);
static void USB_Acm_Ep0_SetLineCoding(void *data);
static void USB_Acm_Ep0_Command(Usb_Ep0_Status* pep0state,Usb_Command* pcmd);
static void USB_Acm_BulkOut_Hdr(void);
static void USB_Acm_BulkIn_Reset(void);
static void USB_Acm_BulkOut_Reset(void);
#ifdef __INTERRUPT_TEST__
static void USB_Acm_IntrIn_Hdlr(void);
#endif
static void USB_Acm_FT_BulkOut_Hdr(void );


/*************************************************************
  translate ACM and UART setting functions
**************************************************************/

/* translate ACM line coding to UART DCB */
void USB2UART_LineCoding2DCB(UsbAcm_Line_Coding *pline_coding, UARTDCBStruct *pDCB)
{
	 pDCB->baud = pline_coding->dwDTERate;
	 pDCB->stopBits = pline_coding->bCharFormat+1; 
	 pDCB->parity = pline_coding->bParityType;
	 pDCB->dataBits = pline_coding->bDataBits;
}

/* translate UART DCB to ACM line coding */
void UART2USB_DCB2LineCoding(UARTDCBStruct *pDCB, UsbAcm_Line_Coding *pline_coding)
{
	  pline_coding->dwDTERate = pDCB->baud;
	  pline_coding->bCharFormat = pDCB->stopBits-1;
	  pline_coding->bParityType = pDCB->parity;
	  pline_coding->bDataBits = pDCB->dataBits;
}

/************************************************************
	GPT timeout handle escape character detect
*************************************************************/

/* GPT timer handler for Escape character detect */
void USB2UART_Timeout(void *parameter)
{
	UARTStruct *UARTData=(UARTStruct *)parameter;
	GPTI_StopItem(UARTData->handle);

	switch(UARTData->Rec_state)
	{
	case UART_Get3EscChar:
		/* escape detect */
		UARTData->EscFound = KAL_TRUE;
		UARTData->Rec_state = UART_RecNormal;
		UARTData->EscCount = 0;
		USB2UART_Sendilm(MSG_ID_UART_ESCAPE_DETECTED_IND);
		break;
	case UART_RecNormal:
		/* first timeout, start to check escape character */
		UARTData->Rec_state = UART_StartCheckESC;
		UARTData->EscCount = 0;
		break;
	case UART_StartCheckESC:
		UARTData->Rec_state = UART_RecNormal;
		UARTData->EscCount = 0;
		break;
	}
}

/************************************************************
	Default UART callback function. Send ilm to UART owner
*************************************************************/

void USB2UART_Dafault_Tx_Callback(UART_PORT port)
{
	if (g_UsbACM.send_Txilm)
	{
		/* send message to UART owner*/
		USB2UART_Sendilm(MSG_ID_UART_READY_TO_WRITE_IND);
		g_UsbACM.send_Txilm = KAL_FALSE;
		g_UsbACM.config_send_Txilm = KAL_FALSE;
	}   
}

void USB2UART_Dafault_Rx_Callback(UART_PORT port)
{
	if (g_UsbACM.send_Rxilm)
	{
		/* send ready to read message to UART onwer if needed*/
		USB2UART_Sendilm(MSG_ID_UART_READY_TO_READ_IND);
		g_UsbACM.send_Rxilm = KAL_FALSE;
	} 
}

/************************************************************
	Bulk EP IN handle functions (DMA setup and callback functions)
*************************************************************/

/* 
    Determine transmit data
    If return value is large than 0, the caller should send the data in parameter.
     This function and "USB2UART_Update_Transmit_Data" function must be pair.
*/
static kal_uint32 USB2UART_Check_Transmit_Data(kal_uint32* addr, kal_bool b_check)
{
	kal_uint32 length=0;
	
	g_UsbACM.force_ISR_buffer = KAL_FALSE;
	if(g_UsbACM.ring_buffer_timer_counting == KAL_TRUE)
	{
		GPTI_StopItem(g_UsbACM.ring_buffer_handle);
		g_UsbACM.ring_buffer_timer_counting = KAL_FALSE;
	}
	
	/* First, check if TX ISR buffer has "enough" data to send out */
	/* The data in the ISR TX buffer must be sent out all at one time. Otherwise, the catcher cannot decode the log correctly */
	if (USB2UARTPort.Tx_Buffer_ISR.Write != USB2UARTPort.Tx_Buffer_ISR.Read)
	{
		/* used for callback function to know sent source */
		USB2Uart_MemType = USBTRX_MEM_ISR;
		*addr = (kal_uint32)USB2UARTPort.Tx_Buffer_ISR.CharBuffer+USB2UARTPort.Tx_Buffer_ISR.Read;

		if (USB2UARTPort.Tx_Buffer_ISR.Write >= USB2UARTPort.Tx_Buffer_ISR.Read)
		{
			length = USB2UARTPort.Tx_Buffer_ISR.Write - USB2UARTPort.Tx_Buffer_ISR.Read;

			if(b_check == KAL_TRUE)
			{
				if(length <= (g_UsbACM.acm_param->txisr_ringbuff_size/2))
				{
					length = 0;
					g_UsbACM.ring_buffer_timer_counting = KAL_TRUE;
				}
			}
		}
		else
		{
			/* ISR TX buffer must have data to send out */
			length = USB2UARTPort.Tx_Buffer_ISR.Length - USB2UARTPort.Tx_Buffer_ISR.Read;
		}
	}

	/* check if TX buffer has enough data to send out */
	if ((USB2UARTPort.Tx_Buffer.Write != USB2UARTPort.Tx_Buffer.Read) && (length == 0))
	{
		g_UsbACM.ring_buffer_timer_counting = KAL_FALSE;
		/* used for callback function to know sent source */
		USB2Uart_MemType = USBTRX_MEM_TASK;
		*addr = (kal_uint32)USB2UARTPort.Tx_Buffer.CharBuffer+USB2UARTPort.Tx_Buffer.Read;

		if (USB2UARTPort.Tx_Buffer.Write >= USB2UARTPort.Tx_Buffer.Read)
		{		
			length = USB2UARTPort.Tx_Buffer.Write - USB2UARTPort.Tx_Buffer.Read;

			if(b_check == KAL_TRUE)
			{
				if(length <= (g_UsbACM.acm_param->tx_ringbuff_size/2))
				{
					length = 0;
					g_UsbACM.ring_buffer_timer_counting = KAL_TRUE;
				}
			}
		}
		else
		{
			length = USB2UARTPort.Tx_Buffer.Length - USB2UARTPort.Tx_Buffer.Read;
		}
	}

	if(g_UsbACM.ring_buffer_timer_counting == KAL_TRUE)
	{
		USB2Uart_MemType = USBTRX_MEM_UNKOWN;
		GPTI_StartItem(g_UsbACM.ring_buffer_handle, USBACM_RING_BUFFER_TIMEOUT, USB_Acm_Ring_Buffer_Timeout, NULL);
	}

	/* If the packet size is multiple of 64, make the last one to be less than 64.
		Otherwise the last packet may not be seen on WinXP */
	if(((length&0x3f) == 0) && (length != 0))
		USB2Uart_WriteLength = length - 1;
	else	
		USB2Uart_WriteLength = length;