include/sound/timer.h

   1 #ifndef __SOUND_TIMER_H
   2 #define __SOUND_TIMER_H
   3
   4 /*
   5  *  Timer abstract layer
   6  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>,
   7  *                   Abramo Bagnara <abramo@alsa-project.org>
   8  *
   9  *
  10  *   This program is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU General Public License as published by
  12  *   the Free Software Foundation; either version 2 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This program is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with this program; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  *
  24  */
  25
  26 #include <sound/asound.h>
  27 #include <linux/interrupt.h>
  28
  29 typedef enum sndrv_timer_class snd_timer_class_t;
  30 typedef enum sndrv_timer_slave_class snd_timer_slave_class_t;
  31 typedef enum sndrv_timer_global snd_timer_global_t;
  32 typedef struct sndrv_timer_id snd_timer_id_t;
  33 typedef struct sndrv_timer_ginfo snd_timer_ginfo_t;
  34 typedef struct sndrv_timer_gparams snd_timer_gparams_t;
  35 typedef struct sndrv_timer_gstatus snd_timer_gstatus_t;
  36 typedef struct sndrv_timer_select snd_timer_select_t;
  37 typedef struct sndrv_timer_info snd_timer_info_t;
  38 typedef struct sndrv_timer_params snd_timer_params_t;
  39 typedef struct sndrv_timer_status snd_timer_status_t;
  40 typedef struct sndrv_timer_read snd_timer_read_t;
  41 typedef struct sndrv_timer_tread snd_timer_tread_t;
  42
  43 #define snd_timer_chip(timer) ((timer)->private_data)
  44
  45 #define SNDRV_TIMER_DEVICES     16
  46
  47 #define SNDRV_TIMER_DEV_FLG_PCM 0x10000000
  48
  49 #define SNDRV_TIMER_HW_AUTO     0x00000001      /* auto trigger is supported */
  50 #define SNDRV_TIMER_HW_STOP     0x00000002      /* call stop before start */
  51 #define SNDRV_TIMER_HW_SLAVE    0x00000004      /* only slave timer (variable resolution) */
  52 #define SNDRV_TIMER_HW_FIRST    0x00000008      /* first tick can be incomplete */
  53 #define SNDRV_TIMER_HW_TASKLET  0x00000010      /* timer is called from tasklet */
  54
  55 #define SNDRV_TIMER_IFLG_SLAVE    0x00000001
  56 #define SNDRV_TIMER_IFLG_RUNNING  0x00000002
  57 #define SNDRV_TIMER_IFLG_START    0x00000004
  58 #define SNDRV_TIMER_IFLG_AUTO     0x00000008    /* auto restart */
  59 #define SNDRV_TIMER_IFLG_FAST     0x00000010    /* fast callback (do not use tasklet) */
  60 #define SNDRV_TIMER_IFLG_CALLBACK 0x00000020    /* timer callback is active */
  61 #define SNDRV_TIMER_IFLG_EXCLUSIVE 0x00000040   /* exclusive owner - no more instances */
  62 #define SNDRV_TIMER_IFLG_EARLY_EVENT 0x00000080 /* write early event to the poll queue */
  63
  64 #define SNDRV_TIMER_FLG_CHANGE  0x00000001
  65 #define SNDRV_TIMER_FLG_RESCHED 0x00000002      /* need reschedule */
  66
  67 typedef void (*snd_timer_callback_t) (snd_timer_instance_t * timeri, unsigned long ticks, unsigned long resolution);
  68 typedef void (*snd_timer_ccallback_t) (snd_timer_instance_t * timeri, enum sndrv_timer_event event,
  69                                        struct timespec * tstamp, unsigned long resolution);
  70
  71 struct _snd_timer_hardware {
  72         /* -- must be filled with low-level driver */
  73         unsigned int flags;             /* various flags */
  74         unsigned long resolution;       /* average timer resolution for one tick in nsec */
  75         unsigned long resolution_min;   /* minimal resolution */
  76         unsigned long resolution_max;   /* maximal resolution */
  77         unsigned long ticks;            /* max timer ticks per interrupt */
  78         /* -- low-level functions -- */
  79         int (*open) (snd_timer_t * timer);
  80         int (*close) (snd_timer_t * timer);
  81         unsigned long (*c_resolution) (snd_timer_t * timer);
  82         int (*start) (snd_timer_t * timer);
  83         int (*stop) (snd_timer_t * timer);
  84         int (*set_period) (snd_timer_t * timer, unsigned long period_num, unsigned long period_den);
  85         int (*precise_resolution) (snd_timer_t * timer, unsigned long *num, unsigned long *den);
  86 };
  87
  88 struct _snd_timer {
  89         snd_timer_class_t tmr_class;
  90         snd_card_t *card;
  91         int tmr_device;
  92         int tmr_subdevice;
  93         char id[64];
  94         char name[80];
  95         unsigned int flags;
  96         int running;                    /* running instances */
  97         unsigned long sticks;           /* schedule ticks */
  98         void *private_data;
  99         void (*private_free) (snd_timer_t *timer);
 100         struct _snd_timer_hardware hw;
 101         spinlock_t lock;
 102         struct list_head device_list;
 103         struct list_head open_list_head;
 104         struct list_head active_list_head;
 105         struct list_head ack_list_head;
 106         struct list_head sack_list_head; /* slow ack list head */
 107         struct tasklet_struct task_queue;
 108 };
 109
 110 struct _snd_timer_instance {
 111         snd_timer_t * timer;
 112         char *owner;
 113         unsigned int flags;
 114         void *private_data;
 115         void (*private_free) (snd_timer_instance_t *ti);
 116         snd_timer_callback_t callback;
 117         snd_timer_ccallback_t ccallback;
 118         void *callback_data;
 119         unsigned long ticks;            /* auto-load ticks when expired */
 120         unsigned long cticks;           /* current ticks */
 121         unsigned long pticks;           /* accumulated ticks for callback */
 122         unsigned long resolution;       /* current resolution for tasklet */
 123         unsigned long lost;             /* lost ticks */
 124         snd_timer_slave_class_t slave_class;
 125         unsigned int slave_id;
 126         struct list_head open_list;
 127         struct list_head active_list;
 128         struct list_head ack_list;
 129         struct list_head slave_list_head;
 130         struct list_head slave_active_head;
 131         snd_timer_instance_t *master;
 132 };
 133
 134 /*
 135  *  Registering
 136  */
 137
 138 extern int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t ** rtimer);
 139 extern void snd_timer_notify(snd_timer_t *timer, enum sndrv_timer_event event, struct timespec *tstamp);
 140 extern int snd_timer_global_new(char *id, int device, snd_timer_t **rtimer);
 141 extern int snd_timer_global_free(snd_timer_t *timer);
 142 extern int snd_timer_global_register(snd_timer_t *timer);
 143 extern int snd_timer_global_unregister(snd_timer_t *timer);
 144
 145 extern int snd_timer_open(snd_timer_instance_t ** ti, char *owner, snd_timer_id_t *tid, unsigned int slave_id);
 146 extern int snd_timer_close(snd_timer_instance_t * timeri);
 147 extern unsigned long snd_timer_resolution(snd_timer_instance_t * timeri);
 148 extern int snd_timer_start(snd_timer_instance_t * timeri, unsigned int ticks);
 149 extern int snd_timer_stop(snd_timer_instance_t * timeri);
 150 extern int snd_timer_continue(snd_timer_instance_t * timeri);
 151 extern int snd_timer_pause(snd_timer_instance_t * timeri);
 152
 153 extern void snd_timer_interrupt(snd_timer_t * timer, unsigned long ticks_left);
 154
 155 extern unsigned int snd_timer_system_resolution(void);
 156
 157 #endif /* __SOUND_TIMER_H */