/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * This file describes internal structures.
 */

#ifndef _LIBUSB20_INT_H_
#define _LIBUSB20_INT_H_

struct libusb20_device;
struct libusb20_backend;
struct libusb20_transfer;
struct libusb20_quirk;

union libusb20_session_data {
        unsigned long session_data;
        struct timespec tv;
        uint32_t plugtime;
};

/* USB backend specific */
typedef const char *(libusb20_get_backend_name_t)(void);
typedef int (libusb20_root_get_dev_quirk_t)(struct libusb20_backend *pbe, uint16_t index, struct libusb20_quirk *pq);
typedef int (libusb20_root_get_quirk_name_t)(struct libusb20_backend *pbe, uint16_t index, struct libusb20_quirk *pq);
typedef int (libusb20_root_add_dev_quirk_t)(struct libusb20_backend *pbe, struct libusb20_quirk *pq);
typedef int (libusb20_root_remove_dev_quirk_t)(struct libusb20_backend *pbe, struct libusb20_quirk *pq);
typedef int (libusb20_close_device_t)(struct libusb20_device *pdev);
typedef int (libusb20_dev_get_info_t)(struct libusb20_device *pdev, struct usb_device_info *pinfo);
typedef int (libusb20_dev_get_iface_desc_t)(struct libusb20_device *pdev, uint8_t iface_index, char *buf, uint8_t len);
typedef int (libusb20_init_backend_t)(struct libusb20_backend *pbe);
typedef int (libusb20_open_device_t)(struct libusb20_device *pdev, uint16_t transfer_count_max);
typedef void (libusb20_exit_backend_t)(struct libusb20_backend *pbe);
typedef int (libusb20_root_set_template_t)(struct libusb20_backend *pbe, int temp);
typedef int (libusb20_root_get_template_t)(struct libusb20_backend *pbe, int *ptemp);

#define LIBUSB20_DEFINE(n,field) \
  libusb20_##field##_t *field;

#define LIBUSB20_DECLARE(n,field) \
  /* .field = */ n##_##field,

#define LIBUSB20_BACKEND(m,n) \
  /* description of this backend */ \
  m(n, get_backend_name) \
  /* optional backend methods */ \
  m(n, init_backend) \
  m(n, exit_backend) \
  m(n, dev_get_info) \
  m(n, dev_get_iface_desc) \
  m(n, root_get_dev_quirk) \
  m(n, root_get_quirk_name) \
  m(n, root_add_dev_quirk) \
  m(n, root_remove_dev_quirk) \
  m(n, root_set_template) \
  m(n, root_get_template) \
  /* mandatory device methods */ \
  m(n, open_device) \
  m(n, close_device) \

struct libusb20_backend_methods {
        LIBUSB20_BACKEND(LIBUSB20_DEFINE,)
};

/* USB dummy methods */
typedef int (libusb20_dummy_int_t)(void);
typedef void (libusb20_dummy_void_t)(void);

/* USB device specific */
typedef int (libusb20_detach_kernel_driver_t)(struct libusb20_device *pdev, uint8_t iface_index);
typedef int (libusb20_do_request_sync_t)(struct libusb20_device *pdev, struct LIBUSB20_CONTROL_SETUP_DECODED *setup, void *data, uint16_t *pactlen, uint32_t timeout, uint8_t flags);
typedef int (libusb20_get_config_desc_full_t)(struct libusb20_device *pdev, uint8_t **ppbuf, uint16_t *plen, uint8_t index);
typedef int (libusb20_get_config_index_t)(struct libusb20_device *pdev, uint8_t *pindex);
typedef int (libusb20_kernel_driver_active_t)(struct libusb20_device *pdev, uint8_t iface_index);
typedef int (libusb20_process_t)(struct libusb20_device *pdev);
typedef int (libusb20_reset_device_t)(struct libusb20_device *pdev);
typedef int (libusb20_set_power_mode_t)(struct libusb20_device *pdev, uint8_t power_mode);
typedef int (libusb20_get_power_mode_t)(struct libusb20_device *pdev, uint8_t *power_mode);
typedef int (libusb20_get_power_usage_t)(struct libusb20_device *pdev, uint16_t *power_usage);
typedef int (libusb20_get_stats_t)(struct libusb20_device *pdev, struct libusb20_device_stats *pstats);
typedef int (libusb20_set_alt_index_t)(struct libusb20_device *pdev, uint8_t iface_index, uint8_t alt_index);
typedef int (libusb20_set_config_index_t)(struct libusb20_device *pdev, uint8_t index);
typedef int (libusb20_check_connected_t)(struct libusb20_device *pdev);


/* USB transfer specific */
typedef int (libusb20_tr_open_t)(struct libusb20_transfer *xfer, uint32_t MaxBufSize, uint32_t MaxFrameCount, uint8_t ep_no, uint16_t stream_id, uint8_t pre_scale);
typedef int (libusb20_tr_close_t)(struct libusb20_transfer *xfer);
typedef int (libusb20_tr_clear_stall_sync_t)(struct libusb20_transfer *xfer);
typedef void (libusb20_tr_submit_t)(struct libusb20_transfer *xfer);
typedef void (libusb20_tr_cancel_async_t)(struct libusb20_transfer *xfer);

#define LIBUSB20_DEVICE(m,n) \
  m(n, detach_kernel_driver) \
  m(n, do_request_sync) \
  m(n, get_config_desc_full) \
  m(n, get_config_index) \
  m(n, kernel_driver_active) \
  m(n, process) \
  m(n, reset_device) \
  m(n, check_connected) \
  m(n, set_power_mode) \
  m(n, get_power_mode) \
  m(n, get_power_usage) \
  m(n, get_stats) \
  m(n, set_alt_index) \
  m(n, set_config_index) \
  m(n, tr_cancel_async) \
  m(n, tr_clear_stall_sync) \
  m(n, tr_close) \
  m(n, tr_open) \
  m(n, tr_submit) \

struct libusb20_device_methods {
        LIBUSB20_DEVICE(LIBUSB20_DEFINE,)
};

struct libusb20_backend {
        TAILQ_HEAD(, libusb20_device) usb_devs;
        const struct libusb20_backend_methods *methods;
};

struct libusb20_transfer {
        struct libusb20_device *pdev;   /* the USB device we belong to */
        libusb20_tr_callback_t *callback;
        void   *priv_sc0;               /* private client data */
        void   *priv_sc1;               /* private client data */
        /*
         * Pointer to a list of buffer pointers:
         */
        void  **ppBuffer;
        /*
         * Pointer to frame lengths, which are updated to actual length
         * after the USB transfer completes:
         */
        uint32_t *pLength;
        uint32_t maxTotalLength;
        uint32_t maxFrames;             /* total number of frames */
        uint32_t nFrames;               /* total number of frames */
        uint32_t aFrames;               /* actual number of frames */
        uint32_t timeout;
        /* isochronous completion time in milliseconds */
        uint16_t timeComplete;
        uint16_t trIndex;
        uint16_t maxPacketLen;
        uint8_t flags;                  /* see LIBUSB20_TRANSFER_XXX */
        uint8_t status;                 /* see LIBUSB20_TRANSFER_XXX */
        uint8_t is_opened;
        uint8_t is_pending;
        uint8_t is_cancel;
        uint8_t is_draining;
        uint8_t is_restart;
};

struct libusb20_device {

        /* device descriptor */
        struct LIBUSB20_DEVICE_DESC_DECODED ddesc;

        /* device timestamp */
        union libusb20_session_data session_data;

        /* our device entry */
        TAILQ_ENTRY(libusb20_device) dev_entry;

        /* device methods */
        const struct libusb20_device_methods *methods;

        /* backend methods */
        const struct libusb20_backend_methods *beMethods;

        /* list of USB transfers */
        struct libusb20_transfer *pTransfer;

        /* private backend data */
        void   *privBeData;

        /* libUSB v0.1 and v1.0 compat data */
        void   *privLuData;

        /* claimed interface */
        uint8_t claimed_interface;

        /* auto detach kernel driver */
        uint8_t auto_detach;
  
        /* device file handle */
        int     file;

        /* device file handle (control transfers only) */
        int     file_ctrl;

        /* debugging level */
        int     debug;

        /* number of USB transfers */
        uint16_t nTransfer;

        uint8_t bus_number;
        uint8_t device_address;
        uint8_t usb_mode;
        uint8_t usb_speed;
        uint8_t is_opened;
        uint8_t parent_address;
        uint8_t parent_port;
        uint8_t port_level;

        char    usb_desc[96];
#define LIBUSB20_DEVICE_PORT_PATH_MAX   32
        uint8_t port_path[LIBUSB20_DEVICE_PORT_PATH_MAX];
};

extern const struct libusb20_backend_methods libusb20_ugen20_backend;
extern const struct libusb20_backend_methods libusb20_linux_backend;

#endif                                  /* _LIBUSB20_INT_H_ */