drivers/sound/sys

/* */
This source file includes following definitions.
tmr2ticks
poll_def_tmr
tmr_reset
def_tmr_open
def_tmr_close
def_tmr_event
def_tmr_get_time
def_tmr_ioctl
def_tmr_arm
   1 /*
   2  * sound/sys_timer.c
   3  *
   4  * The default timer for the Level 2 sequencer interface
   5  * Uses the (1/HZ sec) timer of kernel.
   6  */
   7 /*
   8  * Copyright by Hannu Savolainen 1993-1996
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are
  12  * met: 1. Redistributions of source code must retain the above copyright
  13  * notice, this list of conditions and the following disclaimer. 2.
  14  * Redistributions in binary form must reproduce the above copyright notice,
  15  * this list of conditions and the following disclaimer in the documentation
  16  * and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30 #include <linux/config.h>
  31 
  32 
  33 #define SEQUENCER_C
  34 #include "sound_config.h"
  35 
  36 #ifdef CONFIG_SEQUENCER
  37 
  38 static volatile int opened = 0, tmr_running = 0;
  39 static volatile time_t tmr_offs, tmr_ctr;
  40 static volatile unsigned long ticks_offs;
  41 static volatile int curr_tempo, curr_timebase;
  42 static volatile unsigned long curr_ticks;
  43 static volatile unsigned long next_event_time;
  44 static unsigned long prev_event_time;
  45 
  46 static void     poll_def_tmr (unsigned long dummy);
  47 
  48 
  49 static struct timer_list def_tmr =
  50 {NULL, NULL, 0, 0, poll_def_tmr};
  51 
  52 static unsigned long
  53 tmr2ticks (int tmr_value)
     /*  */
  54 {
  55   /*
  56    *    Convert system timer ticks (HZ) to MIDI ticks
  57    *    (divide # of MIDI ticks/minute by # of system ticks/minute).
  58    */
  59 
  60   return ((tmr_value * curr_tempo * curr_timebase) + (30 * 100)) / (60 * HZ);
  61 }
  62 
  63 static void
  64 poll_def_tmr (unsigned long dummy)
     /*  */
  65 {
  66 
  67   if (opened)
  68     {
  69 
  70       {
  71         def_tmr.expires = (1) + jiffies;
  72         add_timer (&def_tmr);
  73       };
  74 
  75       if (tmr_running)
  76         {
  77           tmr_ctr++;
  78           curr_ticks = ticks_offs + tmr2ticks (tmr_ctr);
  79 
  80           if (curr_ticks >= next_event_time)
  81             {
  82               next_event_time = (unsigned long) -1;
  83               sequencer_timer (0);
  84             }
  85         }
  86     }
  87 }
  88 
  89 static void
  90 tmr_reset (void)
     /*  */
  91 {
  92   unsigned long   flags;
  93 
  94   save_flags (flags);
  95   cli ();
  96   tmr_offs = 0;
  97   ticks_offs = 0;
  98   tmr_ctr = 0;
  99   next_event_time = (unsigned long) -1;
 100   prev_event_time = 0;
 101   curr_ticks = 0;
 102   restore_flags (flags);
 103 }
 104 
 105 static int
 106 def_tmr_open (int dev, int mode)
     /*  */
 107 {
 108   if (opened)
 109     return -EBUSY;
 110 
 111   tmr_reset ();
 112   curr_tempo = 60;
 113   curr_timebase = 100;
 114   opened = 1;
 115 
 116   ;
 117 
 118   {
 119     def_tmr.expires = (1) + jiffies;
 120     add_timer (&def_tmr);
 121   };
 122 
 123   return 0;
 124 }
 125 
 126 static void
 127 def_tmr_close (int dev)
     /*  */
 128 {
 129   opened = tmr_running = 0;
 130   del_timer (&def_tmr);;
 131 }
 132 
 133 static int
 134 def_tmr_event (int dev, unsigned char *event)
     /*  */
 135 {
 136   unsigned char   cmd = event[1];
 137   unsigned long   parm = *(int *) &event[4];
 138 
 139   switch (cmd)
 140     {
 141     case TMR_WAIT_REL:
 142       parm += prev_event_time;
 143     case TMR_WAIT_ABS:
 144       if (parm > 0)
 145         {
 146           long            time;
 147 
 148           if (parm <= curr_ticks)       /* It's the time */
 149             return TIMER_NOT_ARMED;
 150 
 151           time = parm;
 152           next_event_time = prev_event_time = time;
 153 
 154           return TIMER_ARMED;
 155         }
 156       break;
 157 
 158     case TMR_START:
 159       tmr_reset ();
 160       tmr_running = 1;
 161       break;
 162 
 163     case TMR_STOP:
 164       tmr_running = 0;
 165       break;
 166 
 167     case TMR_CONTINUE:
 168       tmr_running = 1;
 169       break;
 170 
 171     case TMR_TEMPO:
 172       if (parm)
 173         {
 174           if (parm < 8)
 175             parm = 8;
 176           if (parm > 360)
 177             parm = 360;
 178           tmr_offs = tmr_ctr;
 179           ticks_offs += tmr2ticks (tmr_ctr);
 180           tmr_ctr = 0;
 181           curr_tempo = parm;
 182         }
 183       break;
 184 
 185     case TMR_ECHO:
 186       seq_copy_to_input (event, 8);
 187       break;
 188 
 189     default:;
 190     }
 191 
 192   return TIMER_NOT_ARMED;
 193 }
 194 
 195 static unsigned long
 196 def_tmr_get_time (int dev)
     /*  */
 197 {
 198   if (!opened)
 199     return 0;
 200 
 201   return curr_ticks;
 202 }
 203 
 204 static int
 205 def_tmr_ioctl (int dev,
     /*  */
 206                unsigned int cmd, caddr_t arg)
 207 {
 208   switch (cmd)
 209     {
 210     case SNDCTL_TMR_SOURCE:
 211       return snd_ioctl_return ((int *) arg, TMR_INTERNAL);
 212       break;
 213 
 214     case SNDCTL_TMR_START:
 215       tmr_reset ();
 216       tmr_running = 1;
 217       return 0;
 218       break;
 219 
 220     case SNDCTL_TMR_STOP:
 221       tmr_running = 0;
 222       return 0;
 223       break;
 224 
 225     case SNDCTL_TMR_CONTINUE:
 226       tmr_running = 1;
 227       return 0;
 228       break;
 229 
 230     case SNDCTL_TMR_TIMEBASE:
 231       {
 232         int             val = get_fs_long ((long *) arg);
 233 
 234         if (val)
 235           {
 236             if (val < 1)
 237               val = 1;
 238             if (val > 1000)
 239               val = 1000;
 240             curr_timebase = val;
 241           }
 242 
 243         return snd_ioctl_return ((int *) arg, curr_timebase);
 244       }
 245       break;
 246 
 247     case SNDCTL_TMR_TEMPO:
 248       {
 249         int             val = get_fs_long ((long *) arg);
 250 
 251         if (val)
 252           {
 253             if (val < 8)
 254               val = 8;
 255             if (val > 250)
 256               val = 250;
 257             tmr_offs = tmr_ctr;
 258             ticks_offs += tmr2ticks (tmr_ctr);
 259             tmr_ctr = 0;
 260             curr_tempo = val;
 261           }
 262 
 263         return snd_ioctl_return ((int *) arg, curr_tempo);
 264       }
 265       break;
 266 
 267     case SNDCTL_SEQ_CTRLRATE:
 268       if (get_fs_long ((long *) arg) != 0)      /* Can't change */
 269         return -EINVAL;
 270 
 271       return snd_ioctl_return ((int *) arg, ((curr_tempo * curr_timebase) + 30) / 60);
 272       break;
 273 
 274     case SNDCTL_TMR_METRONOME:
 275       /* NOP */
 276       break;
 277 
 278     default:;
 279     }
 280 
 281   return -EINVAL;
 282 }
 283 
 284 static void
 285 def_tmr_arm (int dev, long time)
     /*  */
 286 {
 287   if (time < 0)
 288     time = curr_ticks + 1;
 289   else if (time <= curr_ticks)  /* It's the time */
 290     return;
 291 
 292   next_event_time = prev_event_time = time;
 293 
 294   return;
 295 }
 296 
 297 struct sound_timer_operations default_sound_timer =
 298 {
 299   {"System clock", 0},
 300   0,                            /* Priority */
 301   0,                            /* Local device link */
 302   def_tmr_open,
 303   def_tmr_close,
 304   def_tmr_event,
 305   def_tmr_get_time,
 306   def_tmr_ioctl,
 307   def_tmr_arm
 308 };
 309 
 310 #endif
/* */
root/drivers/sound/sys_timer.c

DEFINITIONS
