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https://github.com/torvalds/linux
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bf0835957f
The tasklet is an old API that should be deprecated, usually can be converted to another decent API. In ALSA core timer API, the callbacks can be offlined to a tasklet when a flag is set in the timer backend. It can be achieved gracefully with a work queued in the high-prio system workqueue. This patch replaces the usage of tasklet in ALSA timer API with a simple work. Currently the tasklet feature is used only in the system timer and hrtimer backends, so both are patched to use the new flag name SNDRV_TIMER_HW_WORK, too. Link: https://lore.kernel.org/r/20200903104131.21097-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
134 lines
5.0 KiB
C
134 lines
5.0 KiB
C
/* 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 <perex@perex.cz>,
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* Abramo Bagnara <abramo@alsa-project.org>
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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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