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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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.
ChibiOS/RT 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file usb_msc.c
* @brief USB Mass Storage Class code.
*
* @addtogroup USB_MSC
* @{
*/
#include "ch.h"
#include "hal.h"
#include "usb_msc.h"
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/**
* @brief Zero-filled constant buffer.
*/
static const uint8_t zerobuf[4] = {0, 0, 0, 0};
/**
* @brief MSC state machine current state.
*/
static mscstate_t msc_state;
/**
* @brief Transfer lenght specified in the CBW.
*/
static uint32_t cbw_length;
/**
* @brief Tag specified in the CBW.
*/
static uint32_t cbw_tag;
/**
* @brief Transmitted lenght.
*/
static uint32_t csw_sent;
/**
* @brief Status .
*/
static uint8_t csw_status;
/**
* @brief Multi purpose I/O buffer.
*/
static union {
uint8_t buf[512];
msccbw_t CBW;
msccsw_t CSW;
} u;
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief MSC state machine initialization.
*
* @param[in] usbp pointer to the @p USBDriver object
*/
static void msc_reset(USBDriver *usbp) {
msc_state = MSC_IDLE;
chSysLockFromIsr();
usbStartReceiveI(usbp, MSC_DATA_OUT_EP, u.buf, sizeof(u.buf));
chSysUnlockFromIsr();
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Default requests hook.
* @details The application must use this function as callback for the
* messages hook.
* The following requests are emulated:
* - MSC_GET_MAX_LUN_COMMAND.
* - MSC_MASS_STORAGE_RESET_COMMAND.
* .
*
* @param[in] usbp pointer to the @p USBDriver object
* @return The hook status.
* @retval TRUE Message handled internally.
* @retval FALSE Message not handled.
*/
bool_t mscRequestsHook(USBDriver *usbp) {
if ((usbp->setup[0] & (USB_RTYPE_TYPE_MASK | USB_RTYPE_RECIPIENT_MASK)) ==
(USB_RTYPE_TYPE_CLASS | USB_RTYPE_RECIPIENT_INTERFACE)) {
switch (usbp->setup[1]) {
case MSC_GET_MAX_LUN_COMMAND:
usbSetupTransfer(usbp, (uint8_t *)zerobuf, 1, NULL);
return TRUE;
case MSC_MASS_STORAGE_RESET_COMMAND:
msc_reset(usbp);
usbSetupTransfer(usbp, NULL, 0, NULL);
return TRUE;
default:
return FALSE;
}
}
return FALSE;
}
/**
* @brief Default data transmitted callback.
* @details The application must use this function as callback for the IN
* data endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*/
void mscDataTransmitted(USBDriver *usbp, usbep_t ep) {
switch (msc_state) {
case MSC_DATA_IN:
u.CSW.dCSWSignature = MSC_CSW_SIGNATURE;
u.CSW.dCSWTag = cbw_tag;
u.CSW.dCSWDataResidue = cbw_length - csw_sent;
u.CSW.bCSWStatus = csw_status;
chSysLockFromIsr();
usbStartTransmitI(usbp, ep, (uint8_t *)&u.CSW, sizeof(u.CSW));
chSysUnlockFromIsr();
msc_state = MSC_SENDING_CSW;
break;
case MSC_SENDING_CSW:
chSysLockFromIsr();
usbStartReceiveI(usbp, MSC_DATA_OUT_EP, u.buf, sizeof(u.buf));
chSysUnlockFromIsr();
msc_state = MSC_IDLE;
break;
default:
;
}
}
/**
* @brief Default data received callback.
* @details The application must use this function as callback for the OUT
* data endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*/
void mscDataReceived(USBDriver *usbp, usbep_t ep) {
size_t n;
n = usbGetReceiveTransactionSizeI(usbp, ep);
switch (msc_state) {
case MSC_IDLE:
if ((n != sizeof(msccbw_t)) ||
(u.CBW.dCBWSignature != MSC_CBW_SIGNATURE))
goto stallout; /* 6.6.1 */
cbw_length = u.CBW.dCBWDataTransferLength;
cbw_tag = u.CBW.dCBWTag;
if (u.CBW.bmCBWFlags & 0x80) {
/* IN, Device to Host.*/
/* if (scsi_decode_in(usbp))
goto stallout;*/
msc_state = MSC_DATA_IN;
}
else {
/* OUT, Host to Device.*/
/* if (scsi_decode_out(usbp))
goto stallout;*/
msc_state = MSC_DATA_OUT;
}
break;
default:
;
}
return;
stallout:
msc_state = MSC_ERROR;
usbStallReceiveI(usbp, ep);
return;
}
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