/*
 * Copyright (c) 2010 Isilon Systems, Inc.
 * Copyright (c) 2010 iX Systems, Inc.
 * Copyright (c) 2010 Panasas, Inc.
 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org>
 * 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 unmodified, 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 ``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 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 _LINUX_TIMER_H_
#define _LINUX_TIMER_H_

#include <linux/list.h>
#include <linux/ktime.h>
#include <linux/stddef.h>
#include <linux/stringify.h>

#include <sys/callout.h>

struct timer_list {
        struct callout  timer_callout;
        void            (*function)(unsigned long);
        unsigned long   data;
        unsigned long   expires;
};

static inline void
_timer_fn(void *context)
{
        struct timer_list *timer;

        timer = context;
        timer->function(timer->data);
}

#define setup_timer(timer, func, dat)                                   \
do {                                                                    \
        (timer)->function = (func);                                     \
        (timer)->data = (dat);                                          \
        callout_init_mp(&(timer)->timer_callout);                       \
} while (0)

#define setup_timer_on_stack(t, f,d)    setup_timer(t, f, d)

#define __setup_timer(timer, func, data, flags)                         \
do {                                                                    \
        setup_timer(timer, func, data);                                 \
} while (0)

#define init_timer(timer)                                               \
do {                                                                    \
        (timer)->function = NULL;                                       \
        (timer)->data = 0;                                              \
        callout_init_mp(&(timer)->timer_callout);                       \
} while (0)

#define mod_timer(timer, exp)                                           \
do {                                                                    \
        (timer)->expires = (exp);                                       \
        callout_reset(&(timer)->timer_callout, (exp) - jiffies,         \
            _timer_fn, (timer));                                        \
} while (0)

#define mod_timer_pinned(timer, exp)    mod_timer(timer, exp)

#define add_timer(timer)                                                \
        callout_reset(&(timer)->timer_callout,                          \
            (timer)->expires - jiffies, _timer_fn, (timer));            \

static inline int
del_timer(struct timer_list *timer)
{
        return callout_stop(&(timer)->timer_callout);
}

static inline int
del_timer_sync(struct timer_list *timer)
{
        return callout_drain(&(timer)->timer_callout) == 0;
}

#define del_singleshot_timer_sync(timer)        del_timer_sync(timer)

#define timer_pending(timer)    callout_pending(&(timer)->timer_callout)

static inline unsigned long
round_jiffies(unsigned long j)
{
        return roundup(j, hz);
}

static inline unsigned long
round_jiffies_up(unsigned long j)
{
        return roundup(j, hz);
}

static inline unsigned long
round_jiffies_up_relative(unsigned long j)
{
        return roundup(j, hz);
}

#define destroy_timer_on_stack(timer)

#define TIMER_IRQSAFE   0x00200000

#define from_timer(var, arg, field)                     \
        container_of(arg, typeof(*(var)), field)

static inline void
timer_setup(struct timer_list *timer,
            void (*callback)(struct timer_list *),
            unsigned int flags)
{
        setup_timer(timer,
            (void (*)(unsigned long))callback,
            (unsigned long)timer);
}

#endif /* _LINUX_TIMER_H_ */