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