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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 hathach for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "tusb.h"
// // #include "supervisor/flash.h"
// For updating fatfs's cache
#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "lib/oofatfs/diskio.h"
#include "lib/oofatfs/ff.h"
#include "py/mpstate.h"
#include "supervisor/filesystem.h"
#include "supervisor/shared/autoreload.h"
#define MSC_FLASH_BLOCK_SIZE 512
static bool ejected[1];
// The root FS is always at the end of the list.
static fs_user_mount_t* get_vfs(int lun) {
// TODO(tannewt): Return the mount which matches the lun where 0 is the end
// and is counted in reverse.
if (lun > 0) {
return NULL;
}
mp_vfs_mount_t* current_mount = MP_STATE_VM(vfs_mount_table);
if (current_mount == NULL) {
return NULL;
}
while (current_mount->next != NULL) {
current_mount = current_mount->next;
}
return current_mount->obj;
}
// Callback invoked when received an SCSI command not in built-in list below
// - READ_CAPACITY10, READ_FORMAT_CAPACITY, INQUIRY, MODE_SENSE6, REQUEST_SENSE
// - READ10 and WRITE10 have their own callbacks
int32_t tud_msc_scsi_cb (uint8_t lun, const uint8_t scsi_cmd[16], void* buffer, uint16_t bufsize) {
const void* response = NULL;
int32_t resplen = 0;
switch ( scsi_cmd[0] ) {
case SCSI_CMD_TEST_UNIT_READY:
// Command that host uses to check our readiness before sending other commands
resplen = 0;
if (lun > 1) {
resplen = -1;
} else {
fs_user_mount_t* current_mount = get_vfs(lun);
if (current_mount == NULL) {
resplen = -1;
}
if (ejected[lun]) {
resplen = -1;
}
}
break;
case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
// Host is about to read/write etc ... better not to disconnect disk
resplen = 0;
break;
case SCSI_CMD_START_STOP_UNIT:
{
// Host try to eject/safe remove/poweroff us. We could safely disconnect with disk storage, or go into lower power
const scsi_start_stop_unit_t* start_stop = (const scsi_start_stop_unit_t*) scsi_cmd;
// Start bit = 0 : low power mode, if load_eject = 1 : unmount disk storage as well
// Start bit = 1 : Ready mode, if load_eject = 1 : mount disk storage
resplen = 0;
if (start_stop->load_eject == 1) {
if (lun > 1) {
resplen = -1;
} else {
fs_user_mount_t* current_mount = get_vfs(lun);
if (current_mount == NULL) {
resplen = -1;
}
if (disk_ioctl(current_mount, CTRL_SYNC, NULL) != RES_OK) {
resplen = -1;
} else {
ejected[lun] = true;
}
}
}
}
break;
default:
// Set Sense = Invalid Command Operation
tud_msc_set_sense(lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00);
// negative means error -> tinyusb could stall and/or response with failed status
resplen = -1;
break;
}
// return len must not larger than bufsize
if ( resplen > bufsize ) {
resplen = bufsize;
}
// copy response to stack's buffer if any
if ( response && resplen ) {
memcpy(buffer, response, resplen);
}
return resplen;
}
void tud_msc_capacity_cb(uint8_t lun, uint32_t* block_count, uint16_t* block_size) {
fs_user_mount_t * vfs = get_vfs(lun);
disk_ioctl(vfs, GET_SECTOR_COUNT, block_count);
disk_ioctl(vfs, GET_SECTOR_SIZE, block_size);
}
bool tud_msc_is_writable_cb(uint8_t lun) {
if (lun > 1) {
return false;
}
fs_user_mount_t* vfs = get_vfs(lun);
if (vfs == NULL) {
return false;
}
if (vfs->writeblocks[0] == MP_OBJ_NULL || !filesystem_is_writable_by_usb(vfs)) {
return false;
}
return true;
}
// Callback invoked when received READ10 command.
// Copy disk's data to buffer (up to bufsize) and return number of copied bytes.
int32_t tud_msc_read10_cb (uint8_t lun, uint32_t lba, uint32_t offset, void* buffer, uint32_t bufsize) {
(void) lun;
(void) offset;
const uint32_t block_count = bufsize / MSC_FLASH_BLOCK_SIZE;
fs_user_mount_t * vfs = get_vfs(lun);
disk_read(vfs, buffer, lba, block_count);
return block_count * MSC_FLASH_BLOCK_SIZE;
}
// Callback invoked when received WRITE10 command.
// Process data in buffer to disk's storage and return number of written bytes
int32_t tud_msc_write10_cb (uint8_t lun, uint32_t lba, uint32_t offset, uint8_t* buffer, uint32_t bufsize) {
(void) lun;
(void) offset;
const uint32_t block_count = bufsize / MSC_FLASH_BLOCK_SIZE;
fs_user_mount_t * vfs = get_vfs(lun);
disk_write(vfs, buffer, lba, block_count);
// Since by getting here we assume the mount is read-only to
// MicroPython let's update the cached FatFs sector if it's the one
// we just wrote.
#if _MAX_SS != _MIN_SS
if (vfs->ssize == MSC_FLASH_BLOCK_SIZE) {
#else
// The compiler can optimize this away.
if (_MAX_SS == FILESYSTEM_BLOCK_SIZE) {
#endif
if (lba == vfs->fatfs.winsect && lba > 0) {
memcpy(vfs->fatfs.win,
buffer + MSC_FLASH_BLOCK_SIZE * (vfs->fatfs.winsect - lba),
MSC_FLASH_BLOCK_SIZE);
}
}
return block_count * MSC_FLASH_BLOCK_SIZE;
}
// Callback invoked when WRITE10 command is completed (status received and accepted by host).
// used to flush any pending cache.
void tud_msc_write10_complete_cb (uint8_t lun) {
(void) lun;
// This write is complete, start the autoreload clock.
autoreload_start();
}
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