/* Copyright (c) 2016 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is property of Nordic Semiconductor ASA.
 * Terms and conditions of usage are described in detail in NORDIC
 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 */

#ifndef APP_USBD_MSC_INTERNAL_H__
#define APP_USBD_MSC_INTERNAL_H__

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup app_usbd_msc_internals USB MSC internals
 * @ingroup app_usbd_msc
 *
 * @brief @tagAPI52840 Internals of the USB MSC class.
 * @{
 */

/**
 * @brief Minimal serial string descriptor length
 * */
#define APP_USBD_MSC_MINIMAL_SERIAL_STRING_SIZE (12 + 1)

/**
 * @brief Forward declaration of Mass Storage Class type
 *
 */
APP_USBD_CLASS_FORWARD(app_usbd_msc);

/*lint -save -e165*/
/**
 * @brief Forward declaration of @ref app_usbd_msc_user_event_e
 *
 */
enum app_usbd_msc_user_event_e;

/*lint -restore*/

/**
 * @brief User event handler
 *
 * @param[in] p_inst    Class instance
 * @param[in] event     User event
 *
 * */
typedef void (*app_usbd_msc_user_ev_handler_t)(app_usbd_class_inst_t const *  p_inst,
                                               enum app_usbd_msc_user_event_e event);

/**
 * @brief MSC part of class instance data
 */
typedef struct {
    uint8_t const * p_raw_desc;         //!< MSC descriptors
    size_t          raw_desc_size;      //!< MSC descriptors size
    void *          p_block_buff;       //!< Block buffer
    size_t          block_buff_size;    //!< Block buffer size (typically 512 bytes)

    nrf_block_dev_t const **   pp_block_devs;      //!< Block devices list
    size_t                     block_devs_count;   //!< Block device list size

    app_usbd_msc_user_ev_handler_t user_ev_handler; //!< User event handler
} app_usbd_msc_inst_t;

/**
 * @brief Internal module state
 */
typedef enum {
    APP_USBD_MSC_STATE_DISABLED,      /**< Internal module state DISABLED      */
    APP_USBD_MSC_STATE_IDLE,          /**< Internal module state IDLE          */
    APP_USBD_MSC_STATE_CBW,           /**< Internal module state CBW           */
    APP_USBD_MSC_STATE_CMD_IN,        /**< Internal module state CMD_IN        */
    APP_USBD_MSC_STATE_CMD_OUT,       /**< Internal module state CMD_OUT       */
    APP_USBD_MSC_STATE_DATA_IN,       /**< Internal module state DATA_IN       */
    APP_USBD_MSC_STATE_DATA_OUT,      /**< Internal module state DATA_OUT      */
    APP_USBD_MSC_STATE_DATA_OUT_WAIT, /**< Internal module state DATA_OUT_WAIT */
    APP_USBD_MSC_STATE_CSW,           /**< Internal module state CSW           */
    APP_USBD_MSC_STATE_UNSUPPORTED,   /**< Internal module state UNSUPPORTED   */
} app_usbd_msc_state_t;

/**
 * @brief MSC context
 *
 * */
typedef struct {
    app_usbd_msc_cbw_t cbw;     //!< SCSI command block wrapper
    app_usbd_msc_csw_t csw;     //!< SCSI Command status wrapper

    app_usbd_msc_state_t state; //!< Internal module state

    struct {
        uint8_t  lun;           //!< Current transfer blocks: logical unit
        uint8_t  csw_status;    //!< Current CSW status
        uint32_t blk_idx;       //!< Current transfer: block index
        uint32_t blk_datasize;  //!< Current transfer: data size to transfer
        uint32_t blk_size;      //!< Current transfer: block size
        uint32_t blk_count;     //!< Current transfer: block count
        uint32_t residue;       //!< @ref app_usbd_msc_csw_t::residue

        bool    trans_in_progress;      //!< Transfer in progress flag
        bool    block_req_in_progress;  //!< Block request in progress flag
        size_t  workbuff_pos;           //!< Current buffer offset (double buffering mode)
        uint8_t req_busy_mask;          //!< Request bust mask (double buffering mode)
        uint8_t trans_req_id;           //!< Current transfered request (double buffering mode)

        nrf_block_req_t req;            //!< Last processed block req (double buffering mode)
    } current;

    size_t resp_len;            //!< Response length

    /*SCSI response container*/
    union {
        app_usbd_scsi_cmd_inquiry_resp_t        inquiry;        //!< @ref APP_USBD_SCSI_CMD_INQUIRY response
        app_usbd_scsi_cmd_requestsense_resp_t   requestsense;   //!< @ref APP_USBD_SCSI_CMD_REQUESTSENSE response
        app_usbd_scsi_cmd_readcapacity10_resp_t readcapacity10; //!< @ref APP_USBD_SCSI_CMD_READCAPACITY10 response
        app_usbd_scsi_cmd_modesense6_resp_t     modesense6;     //!< @ref APP_USBD_SCSI_CMD_MODESENSE6 response
        app_usbd_scsi_cmd_modesense10_resp_t    modesense10;    //!< @ref APP_USBD_SCSI_CMD_MODESENSE10 response
    } scsi_resp;

    uint16_t blk_dev_init_mask;     //!< Block devices init mask
} app_usbd_msc_ctx_t;


/**
 * @brief MSC configuration macro
 *
 * Used by @ref APP_USBD_MSC_GLOBAL_DEF
 *
 * @param iface     Interface number
 * @param endpoints Endpoint list
 * */
#define APP_USBD_MSC_CONFIG(iface, endpoints) ((iface, BRACKET_EXTRACT(endpoints)))


/**
 * @brief Specific class constant data for MSC
 *
 * @ref app_usbd_msc_inst_t
 */
#define APP_USBD_MSC_INSTANCE_SPECIFIC_DEC app_usbd_msc_inst_t inst;


/**
 * @brief Configures MSC instance
 *
 * @param descriptors           Mass storage class descriptors (raw table)
 * @param block_devs            Block devices list
 * @param block_buff            Block buffer
 * @param user_event_handler    User event handler
 */
#define APP_USBD_MSC_INST_CONFIG(descriptors, block_devs, block_buff, user_event_handler)   \
    .inst = {                                                                               \
         .p_raw_desc = descriptors,                                                         \
         .raw_desc_size = sizeof(descriptors),                                              \
         .pp_block_devs = block_devs,                                                       \
         .block_devs_count = ARRAY_SIZE(block_devs),                                        \
         .p_block_buff = block_buff,                                                        \
         .block_buff_size = sizeof(block_buff) / 2,                                         \
         .user_ev_handler = user_event_handler,                                             \
    }

/**
 * @brief Specific class data for MSC
 *
 * @ref app_usbd_msc_ctx_t
 * */
#define APP_USBD_MSC_DATA_SPECIFIC_DEC app_usbd_msc_ctx_t ctx;


/**
 * @brief MSC descriptors config macro
 *
 * @param interface_number Interface number
 * @param ...              Extracted endpoint list
 * */
#define APP_USBD_MSC_DSC_CONFIG(interface_number, ...) {                 \
        APP_USBD_MSC_INTERFACE_DSC(interface_number,                     \
                                   APP_USBD_MSC_SUBCLASS_TRANSPARENT,    \
                                   APP_USBD_MSC_PROTOCOL_BULK)           \
        APP_USBD_MSC_EP_DSC(GET_VA_ARG_1(__VA_ARGS__),                   \
                            GET_VA_ARG_1(GET_ARGS_AFTER_1(__VA_ARGS__)), \
                            64)                                          \
}

/**
 * @brief Public MSC class interface
 *
 * */
extern const app_usbd_class_methods_t app_usbd_msc_class_methods;

/**
 * @brief Global definition of mass storage class instance
 */
#define APP_USBD_MSC_GLOBAL_DEF_INTERNAL(instance_name,                                         \
                                         interface_number,                                      \
                                         user_ev_handler,                                       \
                                         endpoint_list,                                         \
                                         blockdev_list,                                         \
                                         workbuffer_size)                                       \
    static const uint8_t CONCAT_2(instance_name, _dsc)[] =                                      \
                 APP_USBD_MSC_DSC_CONFIG(interface_number, BRACKET_EXTRACT(endpoint_list));     \
    static const nrf_block_dev_t * CONCAT_2(instance_name, _blkdevs)[] =                        \
                                   { BRACKET_EXTRACT(blockdev_list) };                          \
    static uint32_t CONCAT_2(instance_name, _block)[2 *(workbuffer_size) / sizeof(uint32_t)];   \
    APP_USBD_CLASS_INST_GLOBAL_DEF(                                                             \
        instance_name,                                                                          \
        app_usbd_msc,                                                                           \
        &app_usbd_msc_class_methods,                                                            \
        APP_USBD_MSC_CONFIG(interface_number, endpoint_list),                                   \
        (APP_USBD_MSC_INST_CONFIG(CONCAT_2(instance_name, _dsc),                                \
                                  CONCAT_2(instance_name, _blkdevs),                            \
                                  CONCAT_2(instance_name, _block),                              \
                                  user_ev_handler))                                             \
    )


/** @} */


#ifdef __cplusplus
}
#endif

#endif /* APP_USBD_MSC_INTERNAL_H__ */
