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Diffstat (limited to 'include/sound/timer.h')
| -rw-r--r-- | include/sound/timer.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/include/sound/timer.h b/include/sound/timer.h new file mode 100644 index 000000000000..57fde990606e --- /dev/null +++ b/include/sound/timer.h @@ -0,0 +1,157 @@ +#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); + +extern unsigned int snd_timer_system_resolution(void); + +#endif /* __SOUND_TIMER_H */ |