FreeBSD/Linux Kernel Cross Reference
sys/dev/ath/if_ath_tdma.h

     /*-
      * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
      * 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,
     *    without modification.
     * 2. Redistributions in binary form must reproduce at minimum a disclaimer
     *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
     *    redistribution must be conditioned upon including a substantially
     *    similar Disclaimer requirement for further binary redistribution.
     *
     * NO WARRANTY
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
     * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
     * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
     *
     * $FreeBSD: releng/11.2/sys/dev/ath/if_ath_tdma.h 331722 2018-03-29 02:50:57Z eadler $
     */
    #ifndef __IF_ATH_TDMA_H__
    #define __IF_ATH_TDMA_H__
    
    #define TDMA_EP_MULTIPLIER      (1<<10) /* pow2 to optimize out * and / */
    #define TDMA_LPF_LEN            6
    #define TDMA_DUMMY_MARKER       0x127
    #define TDMA_EP_MUL(x, mul)     ((x) * (mul))
    #define TDMA_IN(x)              (TDMA_EP_MUL((x), TDMA_EP_MULTIPLIER))
    #define TDMA_LPF(x, y, len)                                     \
        ((x != TDMA_DUMMY_MARKER) ? (((x) * ((len)-1) + (y)) / (len)) : (y))
    #define TDMA_SAMPLE(x, y)       do {                            \
            x = TDMA_LPF((x), TDMA_IN(y), TDMA_LPF_LEN);            \
    } while (0)
    #define TDMA_EP_RND(x,mul) \
                ((((x)%(mul)) >= ((mul)/2)) ?                       \
                 ((x) + ((mul) - 1)) / (mul) : (x)/(mul))
    #define TDMA_AVG(x)             TDMA_EP_RND(x, TDMA_EP_MULTIPLIER)
    
    extern  void ath_tdma_config(struct ath_softc *sc, struct ieee80211vap *vap);
    extern  void ath_tdma_update(struct ieee80211_node *ni,
                const struct ieee80211_tdma_param *tdma, int changed);
    extern  void ath_tdma_beacon_send(struct ath_softc *sc,
                struct ieee80211vap *vap);
    
    #endif

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