144 lines
5.4 KiB
C
144 lines
5.4 KiB
C
#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>
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#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_TASKLET 0x00000010 /* timer is called from tasklet */
|
|
|
|
#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 tasklet) */
|
|
#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 tasklet_struct task_queue;
|
|
};
|
|
|
|
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 timespec * tstamp,
|
|
unsigned long resolution);
|
|
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 tasklet */
|
|
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 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 timespec *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);
|
|
|
|
int snd_timer_open(struct snd_timer_instance **ti, char *owner, struct snd_timer_id *tid, unsigned int slave_id);
|
|
int 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);
|
|
|
|
#endif /* __SOUND_TIMER_H */
|