sys/dev/ath/if_ath_tdma.h

root/sys/dev/ath/if_ath_tdma.h
/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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.
 */
#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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