/*
 * SPDX-FileCopyrightText: Copyright (c) 2019 Ha Thach (tinyusb.org)
 * SPDX-License-Identifier: MIT
 *
 * This file is part of the TinyUSB stack.
 */

#ifndef TUSB_MSC_H_
#define TUSB_MSC_H_

#include "common/tusb_common.h"

#ifdef __cplusplus
 extern "C" {
#endif

//--------------------------------------------------------------------+
// Mass Storage Class Constant
//--------------------------------------------------------------------+
/// MassStorage Subclass
typedef enum
{
  MSC_SUBCLASS_RBC = 1 , ///< Reduced Block Commands (RBC) T10 Project 1240-D
  MSC_SUBCLASS_SFF_MMC , ///< SFF-8020i, MMC-2 (ATAPI). Typically used by a CD/DVD device
  MSC_SUBCLASS_QIC     , ///< QIC-157. Typically used by a tape device
  MSC_SUBCLASS_UFI     , ///< UFI. Typically used by Floppy Disk Drive (FDD) device
  MSC_SUBCLASS_SFF     , ///< SFF-8070i. Can be used by Floppy Disk Drive (FDD) device
  MSC_SUBCLASS_SCSI      ///< SCSI transparent command set
}msc_subclass_type_t;

enum {
  MSC_CBW_SIGNATURE = 0x43425355, ///< Constant value of 43425355h (little endian)
  MSC_CSW_SIGNATURE = 0x53425355  ///< Constant value of 53425355h (little endian)
};

/// \brief MassStorage Protocol.
/// \details CBI only approved to use with full-speed floppy disk & should not used with highspeed or device other than floppy
typedef enum
{
  MSC_PROTOCOL_CBI              = 0 ,  ///< Control/Bulk/Interrupt protocol (with command completion interrupt)
  MSC_PROTOCOL_CBI_NO_INTERRUPT = 1 ,  ///< Control/Bulk/Interrupt protocol (without command completion interrupt)
  MSC_PROTOCOL_BOT              = 0x50 ///< Bulk-Only Transport
}msc_protocol_type_t;

/// MassStorage Class-Specific Control Request
typedef enum
{
  MSC_REQ_GET_MAX_LUN = 254, ///< The Get Max LUN device request is used to determine the number of logical units supported by the device. Logical Unit Numbers on the device shall be numbered contiguously starting from LUN 0 to a maximum LUN of 15
  MSC_REQ_RESET       = 255  ///< This request is used to reset the mass storage device and its associated interface. This class-specific request shall ready the device for the next CBW from the host.
}msc_request_type_t;

/// \brief Command Block Status Values
/// \details Indicates the success or failure of the command. The device shall set this byte to zero if the command completed
/// successfully. A non-zero value shall indicate a failure during command execution according to the following
typedef enum
{
  MSC_CSW_STATUS_PASSED = 0 , ///< MSC_CSW_STATUS_PASSED
  MSC_CSW_STATUS_FAILED     , ///< MSC_CSW_STATUS_FAILED
  MSC_CSW_STATUS_PHASE_ERROR  ///< MSC_CSW_STATUS_PHASE_ERROR
}msc_csw_status_t;

/// Command Block Wrapper
typedef struct TU_ATTR_PACKED
{
  uint32_t signature;   ///< Signature that helps identify this data packet as a CBW. The signature field shall contain the value 43425355h (little endian), indicating a CBW.
  uint32_t tag;         ///< Tag sent by the host. The device shall echo the contents of this field back to the host in the dCSWTagfield of the associated CSW. The dCSWTagpositively associates a CSW with the corresponding CBW.
  uint32_t total_bytes; ///< The number of bytes of data that the host expects to transfer on the Bulk-In or Bulk-Out endpoint (as indicated by the Direction bit) during the execution of this command. If this field is zero, the device and the host shall transfer no data between the CBW and the associated CSW, and the device shall ignore the value of the Direction bit in bmCBWFlags.
  uint8_t dir;          ///< Bit 7 of this field define transfer direction \n - 0 : Data-Out from host to the device. \n - 1 : Data-In from the device to the host.
  uint8_t lun;          ///< The device Logical Unit Number (LUN) to which the command block is being sent. For devices that support multiple LUNs, the host shall place into this field the LUN to which this command block is addressed. Otherwise, the host shall set this field to zero.
  uint8_t cmd_len;      ///< The valid length of the CBWCBin bytes. This defines the valid length of the command block. The only legal values are 1 through 16
  uint8_t command[16];  ///< The command block to be executed by the device. The device shall interpret the first cmd_len bytes in this field as a command block
}msc_cbw_t;

TU_VERIFY_STATIC(sizeof(msc_cbw_t) == 31, "size is not correct");

/// Command Status Wrapper
typedef struct TU_ATTR_PACKED
{
  uint32_t signature    ; ///< Signature that helps identify this data packet as a CSW. The signature field shall contain the value 53425355h (little endian), indicating CSW.
  uint32_t tag          ; ///< The device shall set this field to the value received in the dCBWTag of the associated CBW.
  uint32_t data_residue ; ///< For Data-Out the device shall report in the dCSWDataResidue the difference between the amount of data expected as stated in the dCBWDataTransferLength, and the actual amount of data processed by the device. For Data-In the device shall report in the dCSWDataResiduethe difference between the amount of data expected as stated in the dCBWDataTransferLengthand the actual amount of relevant data sent by the device
  uint8_t  status       ; ///< indicates the success or failure of the command. Values from \ref msc_csw_status_t
}msc_csw_t;

TU_VERIFY_STATIC(sizeof(msc_csw_t) == 13, "size is not correct");

//--------------------------------------------------------------------+
// SCSI Constant
//--------------------------------------------------------------------+

/// SCSI Command Operation Code
typedef enum {
  SCSI_CMD_TEST_UNIT_READY              = 0x00, ///< The SCSI Test Unit Ready command is used to determine if a device is ready to transfer data (read/write), i.e. if a disk has spun up, if a tape is loaded and ready etc. The device does not perform a self-test operation.
  SCSI_CMD_INQUIRY                      = 0x12, ///< The SCSI Inquiry command is used to obtain basic information from a target device.
  SCSI_CMD_MODE_SELECT_6                = 0x15, ///<  provides a means for the application client to specify medium, logical unit, or peripheral device parameters to the device server. Device servers that implement the MODE SELECT(6) command shall also implement the MODE SENSE(6) command. Application clients should issue MODE SENSE(6) prior to each MODE SELECT(6) to determine supported mode pages, page lengths, and other parameters.
  SCSI_CMD_MODE_SENSE_6                 = 0x1A, ///< provides a means for a device server to report parameters to an application client. It is a complementary command to the MODE SELECT(6) command. Device servers that implement the MODE SENSE(6) command shall also implement the MODE SELECT(6) command.
  SCSI_CMD_START_STOP_UNIT              = 0x1B,
  SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL = 0x1E,
  SCSI_CMD_READ_CAPACITY_10             = 0x25, ///< The SCSI Read Capacity command is used to obtain data capacity information from a target device.
  SCSI_CMD_REQUEST_SENSE                = 0x03, ///< The SCSI Request Sense command is part of the SCSI computer protocol standard. This command is used to obtain sense data -- status/error information -- from a target device.
  SCSI_CMD_READ_FORMAT_CAPACITY         = 0x23, ///< The command allows the Host to request a list of the possible format capacities for an installed writable media. This command also has the capability to report the writable capacity for a media when it is installed
  SCSI_CMD_READ_10                      = 0x28, ///< The READ (10) command requests that the device server read the specified logical block(s) and transfer them to the data-in buffer.
  SCSI_CMD_WRITE_10                     = 0x2A, ///< The WRITE (10) command requests that the device server transfer the specified logical block(s) from the data-out buffer and write them.
}scsi_cmd_type_t;

/// SCSI Sense Key
typedef enum {
  SCSI_SENSE_NONE            = 0x00, ///< no specific Sense Key. This would be the case for a successful command
  SCSI_SENSE_RECOVERED_ERROR = 0x01, ///< Indicates the last command completed successfully with some recovery action performed by the disc drive.
  SCSI_SENSE_NOT_READY       = 0x02, ///< Indicates the logical unit addressed cannot be accessed.
  SCSI_SENSE_MEDIUM_ERROR    = 0x03, ///< Indicates the command terminated with a non-recovered error condition.
  SCSI_SENSE_HARDWARE_ERROR  = 0x04, ///< Indicates the disc drive detected a nonrecoverable hardware failure while performing the command or during a self test.
  SCSI_SENSE_ILLEGAL_REQUEST = 0x05, ///< Indicates an illegal parameter in the command descriptor block or in the additional parameters
  SCSI_SENSE_UNIT_ATTENTION  = 0x06, ///< Indicates the disc drive may have been reset.
  SCSI_SENSE_DATA_PROTECT    = 0x07, ///< Indicates that a command that reads or writes the medium was attempted on a block that is protected from this operation. The read or write operation is not performed.
  SCSI_SENSE_FIRMWARE_ERROR  = 0x08, ///< Vendor specific sense key.
  SCSI_SENSE_ABORTED_COMMAND = 0x0b, ///< Indicates the disc drive aborted the command.
  SCSI_SENSE_EQUAL           = 0x0c, ///< Indicates a SEARCH DATA command has satisfied an equal comparison.
  SCSI_SENSE_VOLUME_OVERFLOW = 0x0d, ///< Indicates a buffered peripheral device has reached the end of medium partition and data remains in the buffer that has not been written to the medium.
  SCSI_SENSE_MISCOMPARE      = 0x0e  ///< Indicates that the source data did not match the data read from the medium.
}scsi_sense_key_type_t;


typedef enum {
  SCSI_PDT_DIRECT_ACCESS = 0x0,
  SCSI_PDT_SEQUENTIAL_ACCESS = 0x1,
  SCSI_PDT_PRINTER = 0x2,
  SCSI_PDT_PROCESSOR = 0x3,
  SCSI_PDT_WRITE_ONCE = 0x4,
  SCSI_PDT_CD_DVD = 0x5,
  SCSI_PDT_SCANNER = 0x6,
  SCSI_PDT_OPTICAL_DEVICE = 0x7,
  SCSI_PDT_MEDIUM_CHANGER = 0x8,
  SCSI_PDT_COMMUNICATIONS = 0x9, // obsolete
  SCSI_PDT_RAID = 0x0c,
  SCSI_PDT_ENCLOSURE_SERVICES = 0x0d,
  SCSI_PDT_SIMPLIFIED_DIRECT_ACCESS = 0x0e,
  SCSI_PDT_OPTICAL_CARD_READER = 0x0f,
  SCSI_PDT_BRIDGE = 0x10, ///< Bridge device, e.g. USB to SCSI bridge
  SCSI_PDT_OBJECT_BASED_STORAGE = 0x11, ///< Object-based storage device
  SCSI_PDT_AUTOMATION_DRIVE_INTERFACE = 0x12, ///< Automation/Drive Interface (ADI) device
} scsi_peripheral_device_type_t;

//--------------------------------------------------------------------+
// SCSI Primary Command (SPC-4)
//--------------------------------------------------------------------+

/// SCSI Test Unit Ready Command
typedef struct TU_ATTR_PACKED
{
  uint8_t cmd_code    ; ///< SCSI OpCode for \ref SCSI_CMD_TEST_UNIT_READY
  uint8_t lun         ; ///< Logical Unit
  uint8_t reserved[3] ;
  uint8_t control     ;
} scsi_test_unit_ready_t;

TU_VERIFY_STATIC(sizeof(scsi_test_unit_ready_t) == 6, "size is not correct");

/// SCSI Inquiry Command
typedef struct TU_ATTR_PACKED
{
  uint8_t cmd_code     ; ///< SCSI OpCode for \ref SCSI_CMD_INQUIRY
  uint8_t reserved1    ;
  uint8_t page_code    ;
  uint8_t reserved2    ;
  uint8_t alloc_length ; ///< specifies the maximum number of bytes that USB host has allocated in the Data-In Buffer. An allocation length of zero specifies that no data shall be transferred.
  uint8_t control      ;
} scsi_inquiry_t, scsi_request_sense_t;

TU_VERIFY_STATIC(sizeof(scsi_inquiry_t) == 6, "size is not correct");

/// SCSI Inquiry Response Data
typedef struct TU_ATTR_PACKED
{
  uint8_t peripheral_device_type     : 5;
  uint8_t peripheral_qualifier       : 3;

  uint8_t                            : 7;
  uint8_t is_removable               : 1;

  uint8_t version;

  uint8_t response_data_format       : 4;
  uint8_t hierarchical_support       : 1;
  uint8_t normal_aca                 : 1;
  uint8_t                            : 2;

  uint8_t additional_length;

  uint8_t protect                    : 1;
  uint8_t                            : 2;
  uint8_t third_party_copy           : 1;
  uint8_t target_port_group_support  : 2;
  uint8_t access_control_coordinator : 1;
  uint8_t scc_support                : 1;

  uint8_t addr16                     : 1;
  uint8_t                            : 3;
  uint8_t multi_port                 : 1;
  uint8_t                            : 1; // vendor specific
  uint8_t enclosure_service          : 1;
  uint8_t                            : 1;

  uint8_t                            : 1; // vendor specific
  uint8_t cmd_que                    : 1;
  uint8_t                            : 2;
  uint8_t sync                       : 1;
  uint8_t wbus16                     : 1;
  uint8_t                            : 2;

  uint8_t vendor_id[8]  ; ///< 8 bytes of ASCII data identifying the vendor of the product.
  uint8_t product_id[16]; ///< 16 bytes of ASCII data defined by the vendor.
  uint8_t product_rev[4]; ///< 4 bytes of ASCII data defined by the vendor.
} scsi_inquiry_resp_t;

TU_VERIFY_STATIC(sizeof(scsi_inquiry_resp_t) == 36, "size is not correct");


typedef struct TU_ATTR_PACKED
{
  uint8_t response_code : 7; ///< 70h - current errors, Fixed Format 71h - deferred errors, Fixed Format
  uint8_t valid         : 1;

  uint8_t reserved;

  uint8_t sense_key     : 4;
  uint8_t               : 1;
  uint8_t ili           : 1; ///< Incorrect length indicator
  uint8_t end_of_medium : 1;
  uint8_t filemark      : 1;

  uint32_t information;
  uint8_t  add_sense_len;
  uint32_t command_specific_info;
  uint8_t  add_sense_code;
  uint8_t  add_sense_qualifier;
  uint8_t  field_replaceable_unit_code;

  uint8_t  sense_key_specific[3]; ///< sense key specific valid bit is bit 7 of key[0], aka MSB in Big Endian layout

} scsi_sense_fixed_resp_t;

TU_VERIFY_STATIC(sizeof(scsi_sense_fixed_resp_t) == 18, "size is not correct");

typedef struct TU_ATTR_PACKED
{
  uint8_t cmd_code     ; ///< SCSI OpCode for \ref SCSI_CMD_MODE_SENSE_6

  uint8_t : 3;
  uint8_t disable_block_descriptor : 1;
  uint8_t : 4;

  uint8_t page_code : 6;
  uint8_t page_control : 2;

  uint8_t subpage_code;
  uint8_t alloc_length;
  uint8_t control;
} scsi_mode_sense6_t;

TU_VERIFY_STATIC( sizeof(scsi_mode_sense6_t) == 6, "size is not correct");

// This is only a Mode parameter header(6).
typedef struct TU_ATTR_PACKED
{
  uint8_t data_len;
  uint8_t medium_type;

  uint8_t reserved : 7;
  bool write_protected : 1;

  uint8_t block_descriptor_len;
} scsi_mode_sense6_resp_t;

TU_VERIFY_STATIC( sizeof(scsi_mode_sense6_resp_t) == 4, "size is not correct");

typedef struct TU_ATTR_PACKED
{
  uint8_t cmd_code; ///< SCSI OpCode for \ref SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL
  uint8_t reserved[3];
  uint8_t prohibit_removal;
  uint8_t control;
} scsi_prevent_allow_medium_removal_t;

TU_VERIFY_STATIC( sizeof(scsi_prevent_allow_medium_removal_t) == 6, "size is not correct");

typedef struct TU_ATTR_PACKED
{
  uint8_t cmd_code;

  uint8_t immded : 1;
  uint8_t        : 7;

  uint8_t TU_RESERVED;

  uint8_t power_condition_mod : 4;
  uint8_t                     : 4;

  uint8_t start           : 1;
  uint8_t load_eject      : 1;
  uint8_t no_flush        : 1;
  uint8_t                 : 1;
  uint8_t power_condition : 4;

  uint8_t control;
} scsi_start_stop_unit_t;

TU_VERIFY_STATIC( sizeof(scsi_start_stop_unit_t) == 6, "size is not correct");

//--------------------------------------------------------------------+
// SCSI MMC
//--------------------------------------------------------------------+
/// SCSI Read Format Capacity: Write Capacity
typedef struct TU_ATTR_PACKED
{
  uint8_t cmd_code;
  uint8_t reserved[6];
  uint16_t alloc_length;
  uint8_t control;
} scsi_read_format_capacity_t;

TU_VERIFY_STATIC( sizeof(scsi_read_format_capacity_t) == 10, "size is not correct");

typedef struct TU_ATTR_PACKED{
  uint8_t reserved[3];
  uint8_t list_length; /// must be 8*n, length in bytes of formattable capacity descriptor followed it.

  uint32_t block_num; /// Number of Logical Blocks
  uint8_t  descriptor_type; // 00: reserved, 01 unformatted media , 10 Formatted media, 11 No media present

  uint8_t  reserved2;
  uint16_t block_size_u16;

} scsi_read_format_capacity_data_t;

TU_VERIFY_STATIC( sizeof(scsi_read_format_capacity_data_t) == 12, "size is not correct");

//--------------------------------------------------------------------+
// SCSI Block Command (SBC-3)
// NOTE: All data in SCSI command are in Big Endian
//--------------------------------------------------------------------+

/// SCSI Read Capacity 10 Command: Read Capacity
typedef struct TU_ATTR_PACKED
{
  uint8_t  cmd_code                 ; ///< SCSI OpCode for \ref SCSI_CMD_READ_CAPACITY_10
  uint8_t  reserved1                ;
  uint32_t lba                      ; ///< The first Logical Block Address (LBA) accessed by this command
  uint16_t reserved2                ;
  uint8_t  partial_medium_indicator ;
  uint8_t  control                  ;
} scsi_read_capacity10_t;

TU_VERIFY_STATIC(sizeof(scsi_read_capacity10_t) == 10, "size is not correct");

/// SCSI Read Capacity 10 Response Data
typedef struct {
  uint32_t last_lba   ; ///< The last Logical Block Address of the device
  uint32_t block_size ; ///< Block size in bytes
} scsi_read_capacity10_resp_t;

TU_VERIFY_STATIC(sizeof(scsi_read_capacity10_resp_t) == 8, "size is not correct");

/// SCSI Read 10 Command
typedef struct TU_ATTR_PACKED
{
  uint8_t  cmd_code    ; ///< SCSI OpCode
  uint8_t  reserved    ; // has LUN according to wiki
  uint32_t lba         ; ///< The first Logical Block Address (LBA) accessed by this command
  uint8_t  reserved2   ;
  uint16_t block_count ; ///< Number of Blocks used by this command
  uint8_t  control     ;
} scsi_read10_t, scsi_write10_t;

TU_VERIFY_STATIC(sizeof(scsi_read10_t) == 10, "size is not correct");
TU_VERIFY_STATIC(sizeof(scsi_write10_t) == 10, "size is not correct");

#ifdef __cplusplus
 }
#endif

#endif /* TUSB_MSC_H_ */