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/*
Copyright 2016-2023 melonDS team
This file is part of melonDS.
melonDS is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#include "FATIO.h"
#include "fatfs/ff.h"
#include "fatfs/diskio.h"
using namespace melonDS;
static ff_disk_read_cb ReadCb;
static ff_disk_write_cb WriteCb;
static LBA_t SectorCount;
static DSTATUS Status = STA_NOINIT | STA_NODISK;
void melonDS::ff_disk_open(const ff_disk_read_cb& readcb, const ff_disk_write_cb& writecb, LBA_t seccnt)
{
if (!readcb) return;
ReadCb = readcb;
WriteCb = writecb;
SectorCount = seccnt;
Status &= ~STA_NODISK;
if (!writecb) Status |= STA_PROTECT;
else Status &= ~STA_PROTECT;
}
void melonDS::ff_disk_close()
{
ReadCb = nullptr;
WriteCb = nullptr;
SectorCount = 0;
Status &= ~STA_PROTECT;
Status |= STA_NODISK;
}
/*-----------------------------------------------------------------------*/
/* Get Drive Status */
/*-----------------------------------------------------------------------*/
DSTATUS disk_status (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
return Status;
}
/*-----------------------------------------------------------------------*/
/* Inidialize a Drive */
/*-----------------------------------------------------------------------*/
DSTATUS disk_initialize (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
Status &= ~STA_NOINIT;
return Status;
}
/*-----------------------------------------------------------------------*/
/* Read Sector(s) */
/*-----------------------------------------------------------------------*/
DRESULT disk_read (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
BYTE *buff, /* Data buffer to store read data */
LBA_t sector, /* Start sector in LBA */
UINT count /* Number of sectors to read */
)
{
if (Status & (STA_NOINIT | STA_NODISK)) return RES_NOTRDY;
if (!ReadCb) return RES_ERROR;
UINT res = ReadCb(buff, sector, count);
if (res != count) return RES_ERROR;
return RES_OK;
}
/*-----------------------------------------------------------------------*/
/* Write Sector(s) */
/*-----------------------------------------------------------------------*/
#if FF_FS_READONLY == 0
DRESULT disk_write (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
const BYTE *buff, /* Data to be written */
LBA_t sector, /* Start sector in LBA */
UINT count /* Number of sectors to write */
)
{
if (Status & (STA_NOINIT | STA_NODISK)) return RES_NOTRDY;
if (Status & STA_PROTECT) return RES_WRPRT;
if (!WriteCb) return RES_ERROR;
UINT res = WriteCb(buff, sector, count);
if (res != count) return RES_ERROR;
return RES_OK;
}
#endif
/*-----------------------------------------------------------------------*/
/* Miscellaneous Functions */
/*-----------------------------------------------------------------------*/
DRESULT disk_ioctl (
BYTE pdrv, /* Physical drive nmuber (0..) */
BYTE cmd, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
switch (cmd)
{
case CTRL_SYNC:
// TODO: fflush?
return RES_OK;
case GET_SECTOR_COUNT:
*(LBA_t*)buff = SectorCount;
return RES_OK;
case GET_SECTOR_SIZE:
*(WORD*)buff = 0x200;
return RES_OK;
case GET_BLOCK_SIZE:
*(DWORD*)buff = 1;
return RES_OK;
case CTRL_TRIM:
// TODO??
return RES_OK;
}
//printf("FatFS: unknown disk_ioctl(%02X, %02X, %p)\n", pdrv, cmd, buff);
return RES_PARERR;
}
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