1 #ifndef __SOUND_TIMER_H 2 #define __SOUND_TIMER_H 3 4 /* 5 * Timer abstract layer 6 * Copyright (c) by Jaroslav Kysela <perex@perex.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 #define snd_timer_chip(timer) ((timer)->private_data) 30 31 #define SNDRV_TIMER_DEVICES 16 32 33 #define SNDRV_TIMER_DEV_FLG_PCM 0x10000000 34 35 #define SNDRV_TIMER_HW_AUTO 0x00000001 /* auto trigger is supported */ 36 #define SNDRV_TIMER_HW_STOP 0x00000002 /* call stop before start */ 37 #define SNDRV_TIMER_HW_SLAVE 0x00000004 /* only slave timer (variable resolution) */ 38 #define SNDRV_TIMER_HW_FIRST 0x00000008 /* first tick can be incomplete */ 39 #define SNDRV_TIMER_HW_TASKLET 0x00000010 /* timer is called from tasklet */ 40 41 #define SNDRV_TIMER_IFLG_SLAVE 0x00000001 42 #define SNDRV_TIMER_IFLG_RUNNING 0x00000002 43 #define SNDRV_TIMER_IFLG_START 0x00000004 44 #define SNDRV_TIMER_IFLG_AUTO 0x00000008 /* auto restart */ 45 #define SNDRV_TIMER_IFLG_FAST 0x00000010 /* fast callback (do not use tasklet) */ 46 #define SNDRV_TIMER_IFLG_CALLBACK 0x00000020 /* timer callback is active */ 47 #define SNDRV_TIMER_IFLG_EXCLUSIVE 0x00000040 /* exclusive owner - no more instances */ 48 #define SNDRV_TIMER_IFLG_EARLY_EVENT 0x00000080 /* write early event to the poll queue */ 49 50 #define SNDRV_TIMER_FLG_CHANGE 0x00000001 51 #define SNDRV_TIMER_FLG_RESCHED 0x00000002 /* need reschedule */ 52 53 struct snd_timer; 54 55 struct snd_timer_hardware { 56 /* -- must be filled with low-level driver */ 57 unsigned int flags; /* various flags */ 58 unsigned long resolution; /* average timer resolution for one tick in nsec */ 59 unsigned long resolution_min; /* minimal resolution */ 60 unsigned long resolution_max; /* maximal resolution */ 61 unsigned long ticks; /* max timer ticks per interrupt */ 62 /* -- low-level functions -- */ 63 int (*open) (struct snd_timer * timer); 64 int (*close) (struct snd_timer * timer); 65 unsigned long (*c_resolution) (struct snd_timer * timer); 66 int (*start) (struct snd_timer * timer); 67 int (*stop) (struct snd_timer * timer); 68 int (*set_period) (struct snd_timer * timer, unsigned long period_num, unsigned long period_den); 69 int (*precise_resolution) (struct snd_timer * timer, unsigned long *num, unsigned long *den); 70 }; 71 72 struct snd_timer { 73 int tmr_class; 74 struct snd_card *card; 75 struct module *module; 76 int tmr_device; 77 int tmr_subdevice; 78 char id[64]; 79 char name[80]; 80 unsigned int flags; 81 int running; /* running instances */ 82 unsigned long sticks; /* schedule ticks */ 83 void *private_data; 84 void (*private_free) (struct snd_timer *timer); 85 struct snd_timer_hardware hw; 86 spinlock_t lock; 87 struct list_head device_list; 88 struct list_head open_list_head; 89 struct list_head active_list_head; 90 struct list_head ack_list_head; 91 struct list_head sack_list_head; /* slow ack list head */ 92 struct tasklet_struct task_queue; 93 int max_instances; /* upper limit of timer instances */ 94 int num_instances; /* current number of timer instances */ 95 }; 96 97 struct snd_timer_instance { 98 struct snd_timer *timer; 99 char *owner; 100 unsigned int flags; 101 void *private_data; 102 void (*private_free) (struct snd_timer_instance *ti); 103 void (*callback) (struct snd_timer_instance *timeri, 104 unsigned long ticks, unsigned long resolution); 105 void (*ccallback) (struct snd_timer_instance * timeri, 106 int event, 107 struct timespec * tstamp, 108 unsigned long resolution); 109 void (*disconnect)(struct snd_timer_instance *timeri); 110 void *callback_data; 111 unsigned long ticks; /* auto-load ticks when expired */ 112 unsigned long cticks; /* current ticks */ 113 unsigned long pticks; /* accumulated ticks for callback */ 114 unsigned long resolution; /* current resolution for tasklet */ 115 unsigned long lost; /* lost ticks */ 116 int slave_class; 117 unsigned int slave_id; 118 struct list_head open_list; 119 struct list_head active_list; 120 struct list_head ack_list; 121 struct list_head slave_list_head; 122 struct list_head slave_active_head; 123 struct snd_timer_instance *master; 124 }; 125 126 /* 127 * Registering 128 */ 129 130 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, struct snd_timer **rtimer); 131 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp); 132 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer); 133 int snd_timer_global_free(struct snd_timer *timer); 134 int snd_timer_global_register(struct snd_timer *timer); 135 136 int snd_timer_open(struct snd_timer_instance **ti, char *owner, struct snd_timer_id *tid, unsigned int slave_id); 137 int snd_timer_close(struct snd_timer_instance *timeri); 138 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri); 139 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks); 140 int snd_timer_stop(struct snd_timer_instance *timeri); 141 int snd_timer_continue(struct snd_timer_instance *timeri); 142 int snd_timer_pause(struct snd_timer_instance *timeri); 143 144 void snd_timer_interrupt(struct snd_timer *timer, unsigned long ticks_left); 145 146 #endif /* __SOUND_TIMER_H */ 147