#ifndef __SOUND_TIMER_H #define __SOUND_TIMER_H /* * Timer abstract layer * Copyright (c) by Jaroslav Kysela <perex@suse.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> typedef enum sndrv_timer_class snd_timer_class_t; typedef enum sndrv_timer_slave_class snd_timer_slave_class_t; typedef enum sndrv_timer_global snd_timer_global_t; typedef struct sndrv_timer_id snd_timer_id_t; typedef struct sndrv_timer_ginfo snd_timer_ginfo_t; typedef struct sndrv_timer_gparams snd_timer_gparams_t; typedef struct sndrv_timer_gstatus snd_timer_gstatus_t; typedef struct sndrv_timer_select snd_timer_select_t; typedef struct sndrv_timer_info snd_timer_info_t; typedef struct sndrv_timer_params snd_timer_params_t; typedef struct sndrv_timer_status snd_timer_status_t; typedef struct sndrv_timer_read snd_timer_read_t; typedef struct sndrv_timer_tread snd_timer_tread_t; #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 */ typedef void (*snd_timer_callback_t) (snd_timer_instance_t * timeri, unsigned long ticks, unsigned long resolution); typedef void (*snd_timer_ccallback_t) (snd_timer_instance_t * timeri, enum sndrv_timer_event event, struct timespec * tstamp, unsigned long resolution); 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) (snd_timer_t * timer); int (*close) (snd_timer_t * timer); unsigned long (*c_resolution) (snd_timer_t * timer); int (*start) (snd_timer_t * timer); int (*stop) (snd_timer_t * timer); int (*set_period) (snd_timer_t * timer, unsigned long period_num, unsigned long period_den); int (*precise_resolution) (snd_timer_t * timer, unsigned long *num, unsigned long *den); }; struct _snd_timer { snd_timer_class_t tmr_class; snd_card_t *card; 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) (snd_timer_t *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 { snd_timer_t * timer; char *owner; unsigned int flags; void *private_data; void (*private_free) (snd_timer_instance_t *ti); snd_timer_callback_t callback; snd_timer_ccallback_t ccallback; 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 */ snd_timer_slave_class_t 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; snd_timer_instance_t *master; }; /* * Registering */ extern int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer); extern void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp); extern int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer); extern int snd_timer_global_free(snd_timer_t *timer); extern int snd_timer_global_register(snd_timer_t *timer); extern int snd_timer_global_unregister(snd_timer_t *timer); extern int snd_timer_open(snd_timer_instance_t ** ti, char *owner, snd_timer_id_t *tid, unsigned int slave_id); extern int snd_timer_close(snd_timer_instance_t * timeri); extern unsigned long snd_timer_resolution(snd_timer_instance_t * timeri); extern int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks); extern int snd_timer_stop(snd_timer_instance_t * timeri); extern int snd_timer_continue(snd_timer_instance_t * timeri); extern int snd_timer_pause(snd_timer_instance_t * timeri); extern void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left); #endif /* __SOUND_TIMER_H */