forked from mirrors/linux
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>
133 lines
5 KiB
C
133 lines
5 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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