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#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 */