/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2020-2021 Bjoern A. Zeeb
 *
 * 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.
 */

#ifndef _LINUXKPI_LINUX_IOPOLL_H
#define _LINUXKPI_LINUX_IOPOLL_H

#include <sys/types.h>
#include <sys/time.h>
#include <linux/delay.h>

#define read_poll_timeout(_pollfp, _var, _cond, _us, _to, _early_sleep, ...)    \
({                                                                              \
        struct timeval __now, __end;                                            \
        if (_to) {                                                              \
                __end.tv_sec = (_to) / USEC_PER_SEC;                            \
                __end.tv_usec = (_to) % USEC_PER_SEC;                           \
                microtime(&__now);                                              \
                timevaladd(&__end, &__now);                                     \
        }                                                                       \
                                                                                \
        if ((_early_sleep) && (_us) > 0)                                        \
                usleep_range(_us, _us);                                         \
        do {                                                                    \
                (_var) = _pollfp(__VA_ARGS__);                                  \
                if (_cond)                                                      \
                        break;                                                  \
                if (_to) {                                                      \
                        microtime(&__now);                                      \
                        if (timevalcmp(&__now, &__end, >))                      \
                                break;                                          \
                }                                                               \
                if ((_us) != 0)                                                 \
                        usleep_range(_us, _us);                                 \
        } while (1);                                                            \
        (_cond) ? 0 : (-ETIMEDOUT);                                             \
})

#define readx_poll_timeout(_pollfp, _addr, _var, _cond, _us, _to)               \
        read_poll_timeout(_pollfp, _var, _cond, _us, _to, false, _addr)

#define read_poll_timeout_atomic(_pollfp, _var, _cond, _us, _to, _early_sleep, ...)     \
({                                                                              \
        struct timeval __now, __end;                                            \
        if (_to) {                                                              \
                __end.tv_sec = (_to) / USEC_PER_SEC;                            \
                __end.tv_usec = (_to) % USEC_PER_SEC;                           \
                microtime(&__now);                                              \
                timevaladd(&__end, &__now);                                     \
        }                                                                       \
                                                                                \
        if ((_early_sleep) && (_us) > 0)                                        \
                DELAY(_us);                                                     \
        do {                                                                    \
                (_var) = _pollfp(__VA_ARGS__);                                  \
                if (_cond)                                                      \
                        break;                                                  \
                if (_to) {                                                      \
                        microtime(&__now);                                      \
                        if (timevalcmp(&__now, &__end, >))                      \
                                break;                                          \
                }                                                               \
                if ((_us) != 0)                                                 \
                        DELAY(_us);                                             \
        } while (1);                                                            \
        (_cond) ? 0 : (-ETIMEDOUT);                                             \
})

#endif  /* _LINUXKPI_LINUX_IOPOLL_H */