/* SPDX-License-Identifier: GPL-2.0-or-later */#ifndef __SOUND_TIMER_H#define __SOUND_TIMER_H /* *  Timer abstract layer *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>, *		     Abramo Bagnara <abramo@alsa-project.org> */ #include <sound/asound.h>#include <linux/interrupt.h> #define snd_timer_chip(timer) ((timer)->private_data) #define SNDRV_TIMER_DEVICES	16 #define SNDRV_TIMER_DEV_FLG_PCM	0x10000000 #define SNDRV_TIMER_HW_AUTO	0x00000001	/* auto trigger is supported */#define SNDRV_TIMER_HW_STOP	0x00000002	/* call stop before start */#define SNDRV_TIMER_HW_SLAVE	0x00000004	/* only slave timer (variable resolution) */#define SNDRV_TIMER_HW_FIRST	0x00000008	/* first tick can be incomplete */#define SNDRV_TIMER_HW_WORK	0x00000010	/* timer is called from work */ #define SNDRV_TIMER_IFLG_SLAVE	  0x00000001#define SNDRV_TIMER_IFLG_RUNNING  0x00000002#define SNDRV_TIMER_IFLG_START	  0x00000004#define SNDRV_TIMER_IFLG_AUTO	  0x00000008	/* auto restart */#define SNDRV_TIMER_IFLG_FAST	  0x00000010	/* fast callback (do not use work) */#define SNDRV_TIMER_IFLG_CALLBACK 0x00000020	/* timer callback is active */#define SNDRV_TIMER_IFLG_EXCLUSIVE 0x00000040	/* exclusive owner - no more instances */#define SNDRV_TIMER_IFLG_EARLY_EVENT 0x00000080	/* write early event to the poll queue */ #define SNDRV_TIMER_FLG_CHANGE	0x00000001#define SNDRV_TIMER_FLG_RESCHED	0x00000002	/* need reschedule */ struct snd_timer; struct snd_timer_hardware {	/* -- must be filled with low-level driver */	unsigned int flags;		/* various flags */	unsigned long resolution;	/* average timer resolution for one tick in nsec */	unsigned long resolution_min;	/* minimal resolution */	unsigned long resolution_max;	/* maximal resolution */	unsigned long ticks;		/* max timer ticks per interrupt */	/* -- low-level functions -- */	int (*open) (struct snd_timer * timer);	int (*close) (struct snd_timer * timer);	unsigned long (*c_resolution) (struct snd_timer * timer);	int (*start) (struct snd_timer * timer);	int (*stop) (struct snd_timer * timer);	int (*set_period) (struct snd_timer * timer, unsigned long period_num, unsigned long period_den);	int (*precise_resolution) (struct snd_timer * timer, unsigned long *num, unsigned long *den);}; struct snd_timer {	int tmr_class;	struct snd_card *card;	struct module *module;	int tmr_device;	int tmr_subdevice;	char id[64];	char name[80];	unsigned int flags;	int running;			/* running instances */	unsigned long sticks;		/* schedule ticks */	void *private_data;	void (*private_free) (struct snd_timer *timer);	struct snd_timer_hardware hw;	spinlock_t lock;	struct list_head device_list;	struct list_head open_list_head;	struct list_head active_list_head;	struct list_head ack_list_head;	struct list_head sack_list_head; /* slow ack list head */	struct work_struct task_work;	int max_instances;	/* upper limit of timer instances */	int num_instances;	/* current number of timer instances */}; struct snd_timer_instance {	struct snd_timer *timer;	char *owner;	unsigned int flags;	void *private_data;	void (*private_free) (struct snd_timer_instance *ti);	void (*callback) (struct snd_timer_instance *timeri,			  unsigned long ticks, unsigned long resolution);	void (*ccallback) (struct snd_timer_instance * timeri,			   int event,			   struct timespec64 * tstamp,			   unsigned long resolution);	void (*disconnect)(struct snd_timer_instance *timeri);	void *callback_data;	unsigned long ticks;		/* auto-load ticks when expired */	unsigned long cticks;		/* current ticks */	unsigned long pticks;		/* accumulated ticks for callback */	unsigned long resolution;	/* current resolution for work */	unsigned long lost;		/* lost ticks */	int slave_class;	unsigned int slave_id;	struct list_head open_list;	struct list_head active_list;	struct list_head ack_list;	struct list_head slave_list_head;	struct list_head slave_active_head;	struct snd_timer_instance *master;}; /* *  Registering */ int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, struct snd_timer **rtimer);void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp);int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer);int snd_timer_global_free(struct snd_timer *timer);int snd_timer_global_register(struct snd_timer *timer); struct snd_timer_instance *snd_timer_instance_new(const char *owner);void snd_timer_instance_free(struct snd_timer_instance *timeri);int snd_timer_open(struct snd_timer_instance *timeri, struct snd_timer_id *tid, unsigned int slave_id);void snd_timer_close(struct snd_timer_instance *timeri);unsigned long snd_timer_resolution(struct snd_timer_instance *timeri);int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks);int snd_timer_stop(struct snd_timer_instance *timeri);int snd_timer_continue(struct snd_timer_instance *timeri);int snd_timer_pause(struct snd_timer_instance *timeri); void snd_timer_interrupt(struct snd_timer *timer, unsigned long ticks_left); #endif /* __SOUND_TIMER_H */