Unit Storage

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Description


Ultibo Storage Interface unit

This unit provides both the Storage device interface and the generic USB mass storage driver.

USB Mass Storage Devices

The USB Mass Storage Class Control/Bulk/Interrupt (CBI) Transport specification is approved for use only with full-speed floppy disk drives. CBI shall not be used in high-speed capable devices, or in devices other than floppy disk drives. CBI shall not be used in devices that implement LSDFS. Usage of CBI for any new design is discouraged.

Therefore the majority of USB Mass Storage devices use the Bulk only interface.

USB mass storage class devices normally use the SCSI command set and therefore the USB storage driver consumes the SCSI unit for the protocol and command definitions. USB mass storage devices are registered directly as Storage devices not as SCSI devices.

Constants



Storage specific constants STORAGE_*
STORAGE_NAME_PREFIX = 'Storage'; Name prefix for Storage Devices
 
STORAGE_STATUS_TIMER_INTERVAL = 1000;  


Storage device type STORAGE_TYPE_*
STORAGE_TYPE_NONE = 0;  
STORAGE_TYPE_HDD = 1;  
STORAGE_TYPE_FDD = 2;  
STORAGE_TYPE_CDROM = 3;  
STORAGE_TYPE_OPTICAL = 4;  
STORAGE_TYPE_TAPE = 5;  
STORAGE_TYPE_REMOVABLE = 6;  
 
STORAGE_TYPE_MAX = 6;  


Storage device state STORAGE_STATE_*
STORAGE_STATE_EJECTED = 0;  
STORAGE_STATE_EJECTING = 1;  
STORAGE_STATE_INSERTING = 2;  
STORAGE_STATE_INSERTED = 3;  
 
STORAGE_STATE_MAX = 3;  


Storage device flag STORAGE_FLAG_*
STORAGE_FLAG_NONE = $00000000;  
STORAGE_FLAG_REMOVABLE = $00000001;  
STORAGE_FLAG_LBA48 = $00000002;  
STORAGE_FLAG_NOT_READY = $00000004;  
STORAGE_FLAG_NO_MEDIA = $00000008;  
STORAGE_FLAG_READ_ONLY = $00000010;  
STORAGE_FLAG_WRITE_ONLY = $00000020;  
STORAGE_FLAG_ERASEABLE = $00000040;  
STORAGE_FLAG_LOCKABLE = $00000080;  
STORAGE_FLAG_LOCKED = $00000100;  
STORAGE_FLAG_EJECTABLE = $00000200;  
STORAGE_FLAG_CHANGABLE = $00000400;  


Storage device control code STORAGE_CONTROL_*
STORAGE_CONTROL_TEST_READY = 1; Test Unit Ready
STORAGE_CONTROL_RESET = 2; Reset Device
STORAGE_CONTROL_TEST_MEDIA = 3; Test No Media
STORAGE_CONTROL_LOCK = 4; Lock Media
STORAGE_CONTROL_UNLOCK = 5; Unlock Media
STORAGE_CONTROL_EJECT = 6; Eject Media
STORAGE_CONTROL_TEST_LOCKED = 7; Test Media Locked
STORAGE_CONTROL_TEST_CHANGED = 8; Test Media Changed
STORAGE_CONTROL_GET_VENDORID = 9; Get Vendor Id
STORAGE_CONTROL_GET_PRODUCTID = 10; Get Product Id
STORAGE_CONTROL_GET_SERIAL = 11; Get Serial No
STORAGE_CONTROL_GET_REVISION = 12; Get Revision No
STORAGE_CONTROL_GET_PRODUCT = 13; Get Product Name
STORAGE_CONTROL_GET_MANUFACTURER = 14; Get Manufacturer Name


Storage logging STORAGE_LOG_*
STORAGE_LOG_LEVEL_DEBUG = LOG_LEVEL_DEBUG; Storage debugging messages
STORAGE_LOG_LEVEL_INFO = LOG_LEVEL_INFO; Storage informational messages, such as a device being attached or detached
STORAGE_LOG_LEVEL_WARN = LOG_LEVEL_WARN; Storage warning messages
STORAGE_LOG_LEVEL_ERROR = LOG_LEVEL_ERROR; Storage error messages
STORAGE_LOG_LEVEL_NONE = LOG_LEVEL_NONE; No Storage messages


USB storage USB_STORAGE_*
USBSTORAGE_STORAGE_DESCRIPTION = 'USB Storage Device';  
 
USBSTORAGE_DRIVER_NAME = 'USB Mass Storage Driver'; Name of USB storage driver
 
CB/CBI (Control/Bulk/Interrupt) Requests
USB_STORAGE_REQUEST_CBI_ADSC = 0;  
 
BBB (Bulk Only) Requests
USB_STORAGE_REQUEST_BBB_RESET = $FF;  
USB_STORAGE_REQUEST_BBB_GET_MAX_LUN = $FE;  
 
Command Block Wrapper
USB_STORAGE_CBW_SIGNATUR = $43425355;  
 
USB_STORAGE_CBW_FLAGS_OUT = $00;  
USB_STORAGE_CBW_FLAGS_IN = $80;  
 
USB_STORAGE_CBW_CB_LENGTH = 16;  
 
USB_STORAGE_CBW_SIZE = 31;  
 
Command Status Wrapper
USB_STORAGE_CSW_SIGNATURE = $53425355;  
 
USB_STORAGE_CSW_STATUS_GOOD = $00;  
USB_STORAGE_CSW_STATUS_FAILED = $01;  
USB_STORAGE_CSW_STATUS_PHASE = $02;  
 
USB_STORAGE_CSW_SIZE = 13;  
 
Command Data
USB_STORAGE_COMMAND_MAX_SIZE = 16;  
 
Command Retry Counts
USB_STORAGE_READ_RETRIES = 2;  
USB_STORAGE_WRITE_RETRIES = 2;  
USB_STORAGE_STATUS_RETRIES = 2;  
USB_STORAGE_INQUIRY_RETRIES = 5;  
USB_STORAGE_READ_CAPACITY_RETRIES = 3;  
USB_STORAGE_TEST_UNIT_READY_RETRIES = 5; 10; TestingRPi
 
Peripheral Device Types
These are a subset of the SCSI Peripheral Device Types
USB_STORAGE_DEVICE_TYPE_DISK = $00; SBC Direct-access device (e.g., UHD Floppy disk)
USB_STORAGE_DEVICE_TYPE_CDROM = $05; MMC-5 CD-ROM device
USB_STORAGE_DEVICE_TYPE_OPTICAL = $07; Optical memory device (e.g., Non-CD optical disks)
USB_STORAGE_DEVICE_TYPE_RBC = $0E; RBC Direct-access device (e.g., UHD Floppy disk)
USB_STORAGE_DEVICE_TYPE_UNKNOWN = $1F; Unknown or no device type


Type definitions



Storage enumeration callback

TStorageEnumerate = function(Storage:PStorageDevice; Data:Pointer):LongWord;

Storage notification callback

TStorageNotification = function(Device:PDevice; Data:Pointer; Notification:LongWord):LongWord;

Storage device read

TStorageDeviceRead = function(Storage:PStorageDevice; const Start,Count:Int64; Buffer:Pointer):LongWord;

Storage device write

TStorageDeviceWrite = function(Storage:PStorageDevice; const Start,Count:Int64; Buffer:Pointer):LongWord;

Storage device erase

TStorageDeviceErase = function(Storage:PStorageDevice; const Start,Count:Int64):LongWord;

Storage device control

TStorageDeviceControl = function(Storage:PStorageDevice; Request:Integer; Argument1:LongWord; var Argument2:LongWord):LongWord;

Storage device

PStorageDevice = ^TStorageDevice;

TStorageDevice = record

Device Properties
Device:TDevice; The Device entry for this Storage
Storage Properties
StorageId:LongWord; Unique Id of this Storage in the Storage table
StorageState:LongWord; Storage state (eg STORAGE_STATE_INSERTED)
DeviceRead:TStorageDeviceRead; A Device specific DeviceRead method implementing a standard Storage device interface
DeviceWrite:TStorageDeviceWrite; A Device specific DeviceWrite method implementing a standard Storage device interface
DeviceErase:TStorageDeviceErase; A Device specific DeviceErase method implementing a standard Storage device interface
DeviceControl:TStorageDeviceControl; A Device specific DeviceControl method implementing a standard Storage device interface
Driver Properties
Lock:TMutexHandle; Storage lock
TargetID:LongWord; SCSI Id
TargetLUN:LongWord; LUN
BlockSize:LongWord; Block Size
BlockCount:Int64; Number of Blocks
BlockShift:LongWord; Shift Count for Blocks to Bytes conversion (eg 9 for 512 byte blocks)
Vendor:PChar; ATA Model, SCSI Vendor
Product:PChar; ATA Serial No, SCSI Product
Revision:PChar; Firmware Revision
StatusTimer:TTimerHandle; Timer for status change detection
Statistics Properties
ReadCount:LongWord;  
ReadErrors:LongWord;  
WriteCount:LongWord;  
WriteErrors:LongWord;  
EraseCount:LongWord;  
EraseErrors:LongWord;  
Internal Properties
Prev:PStorageDevice; Previous entry in Storage table
Next:PStorageDevice; Next entry in Storage table

USB command block

PUSBCommandBlock = ^TUSBCommandBlock;

TUSBCommandBlock = record

Note: SBC Command Block (Derived from TSCSICommandBlock)
SCSI Properties
Command:array[0..USB_STORAGE_COMMAND_MAX_SIZE - 1] of Byte; Command
SenseData:array[0..63] of Byte; Request Sense
Status:Byte; SCSI Status
TargetID:Byte; Target Id
TargetLUN:Byte; Target LUN
CommandLength:Byte; Command Length
DataLength:LongWord; Data Length
Data:Pointer; Pointer to Data
MessageOut:array[0..11] of Byte; Message out buffer
MessageIn:array[0..11] of Byte; Message in buffer
SenseCommandLength:Byte; Sense Command Length
SenseDataLength:LongWord; Sense Data Length
SenseCommand:array[0..5] of Byte; Sense Command
ControllerStatus:LongWord; Controller Status
TransferredBytes:LongWord; Transferred Bytes
USB Properties
Direction:Byte; USB Direction (eg USB_DIRECTION_OUT or USB_DIRECTION_IN)

USB storage device

PUSBStorageDevice = ^TUSBStorageDevice;

TUSBStorageDevice = record

Storage Properties
Storage:TStorageDevice;  
USB Properties
Subclass:Byte;  
Protocol:Byte;  
MaxLUN:Byte;  
Sequence:LongWord; For dCBWTag property
Primary:PUSBStorageDevice; Primary storage device (for multi LUN devices)
StorageInterface:PUSBInterface; USB Mass Storage device Interface
ReadWait:TSemaphoreHandle; Read completed semaphore
WriteWait:TSemaphoreHandle; Write completed semaphore
InterruptWait:TSemaphoreHandle; Interrupt completed semaphore
ReadRequest:PUSBRequest; Bulk IN Request
WriteRequest:PUSBRequest; Bulk OUT Request
InterruptRequest:PUSBRequest; Interrupt IN Request
ReadEndpoint:PUSBEndpointDescriptor; Bulk IN Endpoint
WriteEndpoint:PUSBEndpointDescriptor; Bulk OUT Endpoint
InterruptEndpoint:PUSBEndpointDescriptor; Interrupt IN Endpoint
PendingCount:LongWord; Number of USB requests pending for this storage
WaiterThread:TThreadId; Thread waiting for pending requests to complete (for storage eject)
SCSI Properties
CommandBlock:TUSBCommandBlock;  
ATAPI Properties
   
RBC Properties
   

USB command block wrapper

PUSBCommandBlockWrapper = ^TUSBCommandBlockWrapper;

TUSBCommandBlockWrapper = record

dCBWSignature:LongWord;  
dCBWTag:LongWord;  
dCBWDataTransferLength:LongWord;  
bCBWFlags:Byte;  
bCBWLUN:Byte;  
bCBWCBLength:Byte;  
CBWCB:array[0..USB_STORAGE_CBW_CB_LENGTH - 1] of Byte;  

USB command status wrapper

PUSBCommandStatusWrapper = ^TUSBCommandStatusWrapper;

TUSBCommandStatusWrapper = record

dCSWSignature:LongWord;  
dCSWTag:LongWord;  
dCSWDataResidue:LongWord;  
bCSWStatus:Byte;  


Public variables



Storage logging

STORAGE_DEFAULT_LOG_LEVEL:LongWord = STORAGE_LOG_LEVEL_DEBUG; Minimum level for Storage messages. Only messages with level greater than or equal to this will be printed.
STORAGE_LOG_ENABLED:Boolean;


Function declarations



Initialization functions

procedure StorageInit;
Description: To be documented
Note None documented


Storage functions

function StorageDeviceRead(Storage:PStorageDevice; const Start,Count:Int64; Buffer:Pointer):LongWord;
Description: To be documented
Note None documented


function StorageDeviceWrite(Storage:PStorageDevice; const Start,Count:Int64; Buffer:Pointer):LongWord;
Description: To be documented
Note None documented


function StorageDeviceErase(Storage:PStorageDevice; const Start,Count:Int64):LongWord;
Description: To be documented
Note None documented


function StorageDeviceControl(Storage:PStorageDevice; Request:Integer; Argument1:PtrUInt; var Argument2:PtrUInt):LongWord;
Description: To be documented
Note None documented


function StorageDeviceSetState(Storage:PStorageDevice; State:LongWord):LongWord;
Description: Set the state of the specified storage and send a notification
Storage The storage to set the state for
State The new state to set and notify
Return ERROR_SUCCESS if completed or another error code on failure


function StorageDeviceStartStatus(Storage:PStorageDevice; Interval:LongWord):LongWord;
Description: Start status monitoring on the specified storage for insert/eject notifications
Storage The storage to start status monitoring for
Interval The status monitoring interval in milliseconds
Return ERROR_SUCCESS if completed or another error code on failure


function StorageDeviceStopStatus(Storage:PStorageDevice):LongWord;
Description: Stop status monitoring on the specified storage for insert/eject notifications
Storage The storage to stop status monitoring for
Return ERROR_SUCCESS if completed or another error code on failure


function StorageDeviceCreate:PStorageDevice;
Description: Create a new Storage entry
Return Pointer to new Storage entry or nil if storage could not be created


function StorageDeviceCreateEx(Size:LongWord):PStorageDevice;
Description: Create a new Storage entry
Size Size in bytes to allocate for new storage (Including the storage entry)
Return Pointer to new Storage entry or nil if storage could not be created


function StorageDeviceDestroy(Storage:PStorageDevice):LongWord;
Description: Destroy an existing Storage entry
Note None documented


function StorageDeviceRegister(Storage:PStorageDevice):LongWord;
Description: Register a new Storage in the Storage table
Note None documented


function StorageDeviceDeregister(Storage:PStorageDevice):LongWord;
Description: Deregister a Storage from the Storage table
Note None documented


function StorageDeviceFind(StorageId:LongWord):PStorageDevice;
Description: To be documented
Note None documented


function StorageDeviceFindByDevice(Device:PDevice):PStorageDevice;
Description: Find a Storage device by the matching DeviceData property
Device The device entry to match with the DeviceData value
Return The Storage device matched or nil if none found


function StorageDeviceFindByName(const Name:String):PStorageDevice; inline;
Description: To be documented
Note None documented


function StorageDeviceFindByDescription(const Description:String):PStorageDevice; inline;
Description: To be documented
Note None documented


function StorageDeviceEnumerate(Callback:TStorageEnumerate; Data:Pointer):LongWord;
Description: To be documented
Note None documented


function StorageDeviceNotification(Storage:PStorageDevice; Callback:TStorageNotification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: To be documented
Note None documented


USB storage functions

function USBStorageDeviceRead(Storage:PStorageDevice; const Start,Count:Int64; Buffer:Pointer):LongWord;
Description: To be documented
Note According to 3.4 of USB Mass Storage Bulk Only 1.0, requests must be queued one at a time to a device.


function USBStorageDeviceWrite(Storage:PStorageDevice; const Start,Count:Int64; Buffer:Pointer):LongWord;
Description: To be documented
Note According to 3.4 of USB Mass Storage Bulk Only 1.0, requests must be queued one at a time to a device.


function USBStorageDeviceControl(Storage:PStorageDevice; Request:Integer; Argument1:PtrUInt; var Argument2:PtrUInt):LongWord;
Description: To be documented
Note According to 3.4 of USB Mass Storage Bulk Only 1.0, requests must be queued one at a time to a device.


function USBStorageDriverBind(Device:PUSBDevice; Interrface:PUSBInterface):LongWord;
Description: Bind the Storage driver to a USB device if it is suitable
Device The USB device to attempt to bind to
Interrface The USB interface to attempt to bind to (or nil for whole device)
Return USB_STATUS_SUCCESS if completed, USB_STATUS_DEVICE_UNSUPPORTED if unsupported or another error code on failure.


function USBStorageDriverUnbind(Device:PUSBDevice; Interrface:PUSBInterface):LongWord;
Description: Unbind the Storage driver from a USB device
Device The USB device to unbind from
Interrface The USB interface to unbind from (or nil for whole device)
Return USB_STATUS_SUCCESS if completed or another error code on failure


procedure USBStorageReadComplete(Request:PUSBRequest);
Description: Called when a USB request from a USB storage bulk IN endpoint completes
Request The USB request which has completed
Note The thread that submitted the read request will hold the storage lock


procedure USBStorageWriteComplete(Request:PUSBRequest);
Description: Called when a USB request from a USB storage bulk OUT endpoint completes
Request The USB request which has completed
Note The thread that submitted the write request will hold the storage lock


procedure USBStorageInterruptComplete(Request:PUSBRequest);
Description: Called when a USB request from a USB storage IN interrupt endpoint completes
Request The USB request which has completed
Note The thread that submitted the interrupt request will hold the storage lock


Storage helper functions

function StorageGetCount:LongWord; inline;
Description: Get the current storage count
Note None documented


function StorageDeviceCheck(Storage:PStorageDevice):PStorageDevice;
Description: Check if the supplied Storage is in the storage table
Note None documented


function StorageDeviceTypeToString(StorageType:LongWord):String;
Description: To be documented
Note None documented


function StorageDeviceStateToString(StorageState:LongWord):String;
Description: To be documented
Note None documented


function StorageDeviceStateToNotification(State:LongWord):LongWord;
Description: Convert a Storage state value into the notification code for device notifications
Note None documented


procedure StorageLog(Level:LongWord; Storage:PStorageDevice; const AText:String);
Description: To be documented
Note None documented


procedure StorageLogInfo(Storage:PStorageDevice; const AText:String); inline;
Description: To be documented
Note None documented


procedure StorageLogWarn(Storage:PStorageDevice; const AText:String); inline;
Description: To be documented
Note None documented


procedure StorageLogError(Storage:PStorageDevice; const AText:String); inline;
Description: To be documented
Note None documented


procedure StorageLogDebug(Storage:PStorageDevice; const AText:String); inline;
Description: To be documented
Note None documented


procedure StorageStatusTimer(Storage:PStorageDevice);
Description: To be documented
Note None documented


USB storage helper functions

function USBStorageCheckDevice(Device:PUSBDevice):Boolean;
Description: Check if the supplied USB device is suitable for detection as a Mass Storage Device
Device The USB device to check
Return True if the device is suitable or False if it is not


function USBStorageCheckSubclass(Subclass:Byte):Boolean;
Description: To be documented
Note None documented


function USBStorageCheckProtocol(Protocol:Byte):Boolean;
Description: To be documented
Note None documented


function USBStorageBlockSizeToBlockShift(BlockSize:LongWord):LongWord;
Description: To be documented
Note None documented


function USBStoragePatchDevice(Device:PUSBDevice; var Subclass,Protocol:Byte):LongWord;
Description: A function to adjust the subclass and protocol parameters of known defective devices
Note None documented


function USBStorageFixupDevice(Device:PUSBDevice; var Vendor,Product:String):LongWord;
Description: A function to adjust the vendor and product parameters of known defective devices
Note None documented


function USBStorageDeviceLock(Device:PUSBDevice; Storage:PUSBStorageDevice):LongWord;
Description: Issue a Prevent Media Removal request to a storage device
Note None documented


function USBStorageDeviceUnlock(Device:PUSBDevice; Storage:PUSBStorageDevice):LongWord;
Description: Issue a Allow Media Removal request to a storage device
Note None documented


function USBStorageDeviceLoad(Device:PUSBDevice; Storage:PUSBStorageDevice):LongWord;
Description: Issue a Start Stop request to a storage device
Note None documented


function USBStorageDeviceEject(Device:PUSBDevice; Storage:PUSBStorageDevice):LongWord;
Description: Issue a Start Stop request to a storage device
Note None documented


function USBStorageDeviceReset(Device:PUSBDevice; Storage:PUSBStorageDevice):LongWord;
Description: Issue a Storage Reset request to a storage device
Note Reset recovery (5.3.4 in USB Mass Storage Bulk Only 1.0)

For Reset Recovery the host shall issue in the following order: a) a Bulk-Only Mass Storage Reset b) a Clear Feature HALT to the Bulk-In endpoint c) a Clear Feature HALT to the Bulk-Out endpoint This is done in 3 steps. If the reset doesn't succeed, the device should be port reset.


function USBStorageDeviceGetInfo(Device:PUSBDevice; Storage:PUSBStorageDevice):LongWord;
Description: Obtain basic information about a storage device (Type, Size, State, Product etc)
Note None documented


function USBStorageDeviceGetStatus(Device:PUSBDevice; Storage:PUSBStorageDevice):LongWord;
Description: To be documented
Note Supported by Subclass SCSI/UFI/SFF8070


function USBStorageDeviceGetMaxLUN(Device:PUSBDevice; Storage:PUSBStorageDevice; var MaxLUN:Byte):LongWord;
Description: Issue a Get Max LUN request to a storage device
Note None documented


function USBStorageDeviceClearStall(Device:PUSBDevice; Storage:PUSBStorageDevice; Endpoint:PUSBEndpointDescriptor):LongWord;
Description: Issue a USB Clear Feature (HALT) to the supplied endpoint on a storage device
Note None documented


function USBStorageDeviceInquiry(Device:PUSBDevice; Storage:PUSBStorageDevice; var DeviceType,DeviceFlags:LongWord; var Vendor,Product,Revision:PChar):LongWord;
Description: Issue a SCSI Inquiry command to a LUN on a storage device
Note Supported by Subclass SCSI/UFI/SFF8070


function USBStorageDeviceRequestSense(Device:PUSBDevice; Storage:PUSBStorageDevice; var SenseKey,ASC,ASCQ:Byte):LongWord;
Description: Issue a SCSI Request Sense command to a LUN on a storage device
Note Supported by Subclass SCSI/UFI/SFF8070


function USBStorageDeviceReadCapacity(Device:PUSBDevice; Storage:PUSBStorageDevice; var BlockSize,BlockShift:LongWord; var BlockCount:Int64):LongWord;
Description: Issue a SCSI Read Capacity command to a LUN on a storage device
Note Supported by Subclass SCSI/UFI/SFF8070


function USBStorageDeviceTestUnitReady(Device:PUSBDevice; Storage:PUSBStorageDevice; var DeviceFlags:LongWord):LongWord;
Description: Issue a SCSI Test Unit Ready command to a LUN on a storage device
Note Supported by Subclass SCSI/UFI/SFF8070


function USBStorageDeviceRead10(Device:PUSBDevice; Storage:PUSBStorageDevice; Start:LongWord;Count:Word; Buffer:Pointer):LongWord;
Description: Issue a SCSI Read10 command to a LUN on a storage device
Note Supported by Subclass SCSI/UFI/SFF8070

Caller must hold the storage lock


function USBStorageDeviceWrite10(Device:PUSBDevice; Storage:PUSBStorageDevice; Start:LongWord; Count:Word; Buffer:Pointer):LongWord;
Description: Issue a SCSI Write10 command to a LUN on a storage device
Note Supported by Subclass SCSI/UFI/SFF8070

Caller must hold the storage lock


function USBStorageDeviceRead16(Device:PUSBDevice; Storage:PUSBStorageDevice; const Start,Count:Int64; Buffer:Pointer):LongWord;
Description: Issue a SCSI Read16 command to a LUN on a storage device
Note Supported by Subclass SCSI only (Only on devices > 2TB)

Caller must hold the storage lock


function USBStorageDeviceWrite16(Device:PUSBDevice; Storage:PUSBStorageDevice; const Start,Count:Int64; Buffer:Pointer):LongWord;
Description: Issue a SCSI Write16 command to a LUN on a storage device
Note Supported by Subclass SCSI only (Only on devices > 2TB)

Caller must hold the storage lock


function USBStorageDeviceTransport(Device:PUSBDevice; Storage:PUSBStorageDevice; Command:PUSBCommandBlock):LongWord;
Description: Perform the appropriate transport sequence for the device based on subclass and protocol
Note Handles Command/Data/Status phases plus endpoint stall, reset and retry as per the specification. Supported by Subclass SCSI/UFI/SFF8070.

Caller must hold the storage lock.


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