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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141/* 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; struct kref kref; 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 master_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);
struct snd_timer *snd_timeri_timer_get(struct snd_timer_instance *timeri);void snd_timeri_timer_put(struct snd_timer *timer);
DEFINE_FREE(snd_timeri_timer, struct snd_timer *, if (_T) snd_timeri_timer_put(_T))
#endif /* __SOUND_TIMER_H */