Unit Storage

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Description


Storage Devices

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


To be documented

Type definitions


To be documented

Public variables


To be documented

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:LongWord; var Argument2:LongWord):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 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:LongWord; var Argument2:LongWord):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);
Description: To be documented
Note None documented


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


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


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


USB storage helper functions

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;v ar 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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