156 строки
6.2 KiB
C
156 строки
6.2 KiB
C
#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@suse.cz>,
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* Abramo Bagnara <abramo@alsa-project.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/asound.h>
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#include <linux/interrupt.h>
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typedef enum sndrv_timer_class snd_timer_class_t;
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typedef enum sndrv_timer_slave_class snd_timer_slave_class_t;
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typedef enum sndrv_timer_global snd_timer_global_t;
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typedef struct sndrv_timer_id snd_timer_id_t;
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typedef struct sndrv_timer_ginfo snd_timer_ginfo_t;
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typedef struct sndrv_timer_gparams snd_timer_gparams_t;
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typedef struct sndrv_timer_gstatus snd_timer_gstatus_t;
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typedef struct sndrv_timer_select snd_timer_select_t;
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typedef struct sndrv_timer_info snd_timer_info_t;
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typedef struct sndrv_timer_params snd_timer_params_t;
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typedef struct sndrv_timer_status snd_timer_status_t;
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typedef struct sndrv_timer_read snd_timer_read_t;
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typedef struct sndrv_timer_tread snd_timer_tread_t;
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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_TASKLET 0x00000010 /* timer is called from tasklet */
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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 tasklet) */
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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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typedef void (*snd_timer_callback_t) (snd_timer_instance_t * timeri, unsigned long ticks, unsigned long resolution);
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typedef void (*snd_timer_ccallback_t) (snd_timer_instance_t * timeri, enum sndrv_timer_event event,
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struct timespec * tstamp, unsigned long resolution);
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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) (snd_timer_t * timer);
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int (*close) (snd_timer_t * timer);
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unsigned long (*c_resolution) (snd_timer_t * timer);
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int (*start) (snd_timer_t * timer);
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int (*stop) (snd_timer_t * timer);
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int (*set_period) (snd_timer_t * timer, unsigned long period_num, unsigned long period_den);
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int (*precise_resolution) (snd_timer_t * timer, unsigned long *num, unsigned long *den);
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};
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struct _snd_timer {
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snd_timer_class_t tmr_class;
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snd_card_t *card;
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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) (snd_timer_t *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 tasklet_struct task_queue;
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};
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struct _snd_timer_instance {
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snd_timer_t * 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) (snd_timer_instance_t *ti);
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snd_timer_callback_t callback;
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snd_timer_ccallback_t ccallback;
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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 tasklet */
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unsigned long lost; /* lost ticks */
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snd_timer_slave_class_t 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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snd_timer_instance_t *master;
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};
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/*
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* Registering
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*/
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extern int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer);
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extern void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp);
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extern int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer);
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extern int snd_timer_global_free(snd_timer_t *timer);
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extern int snd_timer_global_register(snd_timer_t *timer);
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extern int snd_timer_global_unregister(snd_timer_t *timer);
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extern int snd_timer_open(snd_timer_instance_t ** ti, char *owner, snd_timer_id_t *tid, unsigned int slave_id);
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extern int snd_timer_close(snd_timer_instance_t * timeri);
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extern unsigned long snd_timer_resolution(snd_timer_instance_t * timeri);
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extern int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks);
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extern int snd_timer_stop(snd_timer_instance_t * timeri);
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extern int snd_timer_continue(snd_timer_instance_t * timeri);
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extern int snd_timer_pause(snd_timer_instance_t * timeri);
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extern void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left);
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#endif /* __SOUND_TIMER_H */
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