/* SPDX-License-Identifier: GPL-2.0-or-later *//* *  ALSA sequencer Timer *  Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl> */#ifndef __SND_SEQ_TIMER_H#define __SND_SEQ_TIMER_H #include <sound/timer.h>#include <sound/seq_kernel.h> struct snd_seq_timer_tick {	snd_seq_tick_time_t	cur_tick;	/* current tick */	unsigned long		resolution;	/* time per tick in nsec */	unsigned long		fraction;	/* current time per tick in nsec */}; struct snd_seq_timer {	/* ... tempo / offset / running state */ 	unsigned int		running:1,	/* running state of queue */					initialized:1;	/* timer is initialized */ 	unsigned int		tempo;		/* current tempo, us/tick */	int			ppq;		/* time resolution, ticks/quarter */ 	snd_seq_real_time_t	cur_time;	/* current time */	struct snd_seq_timer_tick	tick;	/* current tick */	int tick_updated;		int			type;		/* timer type */	struct snd_timer_id	alsa_id;	/* ALSA's timer ID */	struct snd_timer_instance	*timeri;	/* timer instance */	unsigned int		ticks;	unsigned long		preferred_resolution; /* timer resolution, ticks/sec */ 	unsigned int skew;	unsigned int skew_base; 	struct timespec64	last_update;	 /* time of last clock update, used for interpolation */ 	spinlock_t lock;};  /* create new timer (constructor) */struct snd_seq_timer *snd_seq_timer_new(void); /* delete timer (destructor) */void snd_seq_timer_delete(struct snd_seq_timer **tmr); /* */static inline void snd_seq_timer_update_tick(struct snd_seq_timer_tick *tick,					     unsigned long resolution){	if (tick->resolution > 0) {		tick->fraction += resolution;		tick->cur_tick += (unsigned int)(tick->fraction / tick->resolution);		tick->fraction %= tick->resolution;	}}  /* compare timestamp between events *//* return 1 if a >= b; otherwise return 0 */static inline int snd_seq_compare_tick_time(snd_seq_tick_time_t *a, snd_seq_tick_time_t *b){	/* compare ticks */	return (*a >= *b);} static inline int snd_seq_compare_real_time(snd_seq_real_time_t *a, snd_seq_real_time_t *b){	/* compare real time */	if (a->tv_sec > b->tv_sec)		return 1;	if ((a->tv_sec == b->tv_sec) && (a->tv_nsec >= b->tv_nsec))		return 1;	return 0;}  static inline void snd_seq_sanity_real_time(snd_seq_real_time_t *tm){	while (tm->tv_nsec >= 1000000000) {		/* roll-over */		tm->tv_nsec -= 1000000000;                tm->tv_sec++;        }}  /* increment timestamp */static inline void snd_seq_inc_real_time(snd_seq_real_time_t *tm, snd_seq_real_time_t *inc){	tm->tv_sec  += inc->tv_sec;	tm->tv_nsec += inc->tv_nsec;	snd_seq_sanity_real_time(tm);} static inline void snd_seq_inc_time_nsec(snd_seq_real_time_t *tm, unsigned long nsec){	tm->tv_nsec  += nsec;	snd_seq_sanity_real_time(tm);} /* called by timer isr */struct snd_seq_queue;int snd_seq_timer_open(struct snd_seq_queue *q);int snd_seq_timer_close(struct snd_seq_queue *q);int snd_seq_timer_midi_open(struct snd_seq_queue *q);int snd_seq_timer_midi_close(struct snd_seq_queue *q);void snd_seq_timer_defaults(struct snd_seq_timer *tmr);void snd_seq_timer_reset(struct snd_seq_timer *tmr);int snd_seq_timer_stop(struct snd_seq_timer *tmr);int snd_seq_timer_start(struct snd_seq_timer *tmr);int snd_seq_timer_continue(struct snd_seq_timer *tmr);int snd_seq_timer_set_tempo(struct snd_seq_timer *tmr, int tempo);int snd_seq_timer_set_tempo_ppq(struct snd_seq_timer *tmr, int tempo, int ppq);int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr, snd_seq_tick_time_t position);int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr, snd_seq_real_time_t position);int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew, unsigned int base);snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr,					       bool adjust_ktime);snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr); extern int seq_default_timer_class;extern int seq_default_timer_sclass;extern int seq_default_timer_card;extern int seq_default_timer_device;extern int seq_default_timer_subdevice;extern int seq_default_timer_resolution; #endif