sound/core/seq/seq_timer.c

   1 /*
   2  *   ALSA sequencer Timer
   3  *   Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
   4  *                              Jaroslav Kysela <perex@suse.cz>
   5  *
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  *
  21  */
  22
  23 #include <sound/driver.h>
  24 #include <sound/core.h>
  25 #include <linux/slab.h>
  26 #include "seq_timer.h"
  27 #include "seq_queue.h"
  28 #include "seq_info.h"
  29
  30 extern int seq_default_timer_class;
  31 extern int seq_default_timer_sclass;
  32 extern int seq_default_timer_card;
  33 extern int seq_default_timer_device;
  34 extern int seq_default_timer_subdevice;
  35 extern int seq_default_timer_resolution;
  36
  37 /* allowed sequencer timer frequencies, in Hz */
  38 #define MIN_FREQUENCY           10
  39 #define MAX_FREQUENCY           6250
  40 #define DEFAULT_FREQUENCY       1000
  41
  42 #define SKEW_BASE       0x10000 /* 16bit shift */
  43
  44 static void snd_seq_timer_set_tick_resolution(seq_timer_tick_t *tick,
  45                                               int tempo, int ppq)
  46 {
  47         if (tempo < 1000000)
  48                 tick->resolution = (tempo * 1000) / ppq;
  49         else {
  50                 /* might overflow.. */
  51                 unsigned int s;
  52                 s = tempo % ppq;
  53                 s = (s * 1000) / ppq;
  54                 tick->resolution = (tempo / ppq) * 1000;
  55                 tick->resolution += s;
  56         }
  57         if (tick->resolution <= 0)
  58                 tick->resolution = 1;
  59         snd_seq_timer_update_tick(tick, 0);
  60 }
  61
  62 /* create new timer (constructor) */
  63 seq_timer_t *snd_seq_timer_new(void)
  64 {
  65         seq_timer_t *tmr;
  66
  67         tmr = kzalloc(sizeof(*tmr), GFP_KERNEL);
  68         if (tmr == NULL) {
  69                 snd_printd("malloc failed for snd_seq_timer_new() \n");
  70                 return NULL;
  71         }
  72         spin_lock_init(&tmr->lock);
  73
  74         /* reset setup to defaults */
  75         snd_seq_timer_defaults(tmr);
  76
  77         /* reset time */
  78         snd_seq_timer_reset(tmr);
  79
  80         return tmr;
  81 }
  82
  83 /* delete timer (destructor) */
  84 void snd_seq_timer_delete(seq_timer_t **tmr)
  85 {
  86         seq_timer_t *t = *tmr;
  87         *tmr = NULL;
  88
  89         if (t == NULL) {
  90                 snd_printd("oops: snd_seq_timer_delete() called with NULL timer\n");
  91                 return;
  92         }
  93         t->running = 0;
  94
  95         /* reset time */
  96         snd_seq_timer_stop(t);
  97         snd_seq_timer_reset(t);
  98
  99         kfree(t);
 100 }
 101
 102 void snd_seq_timer_defaults(seq_timer_t * tmr)
 103 {
 104         /* setup defaults */
 105         tmr->ppq = 96;          /* 96 PPQ */
 106         tmr->tempo = 500000;    /* 120 BPM */
 107         snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq);
 108         tmr->running = 0;
 109
 110         tmr->type = SNDRV_SEQ_TIMER_ALSA;
 111         tmr->alsa_id.dev_class = seq_default_timer_class;
 112         tmr->alsa_id.dev_sclass = seq_default_timer_sclass;
 113         tmr->alsa_id.card = seq_default_timer_card;
 114         tmr->alsa_id.device = seq_default_timer_device;
 115         tmr->alsa_id.subdevice = seq_default_timer_subdevice;
 116         tmr->preferred_resolution = seq_default_timer_resolution;
 117
 118         tmr->skew = tmr->skew_base = SKEW_BASE;
 119 }
 120
 121 void snd_seq_timer_reset(seq_timer_t * tmr)
 122 {
 123         unsigned long flags;
 124
 125         spin_lock_irqsave(&tmr->lock, flags);
 126
 127         /* reset time & songposition */
 128         tmr->cur_time.tv_sec = 0;
 129         tmr->cur_time.tv_nsec = 0;
 130
 131         tmr->tick.cur_tick = 0;
 132         tmr->tick.fraction = 0;
 133
 134         spin_unlock_irqrestore(&tmr->lock, flags);
 135 }
 136
 137
 138 /* called by timer interrupt routine. the period time since previous invocation is passed */
 139 static void snd_seq_timer_interrupt(snd_timer_instance_t *timeri,
 140                                     unsigned long resolution,
 141                                     unsigned long ticks)
 142 {
 143         unsigned long flags;
 144         queue_t *q = (queue_t *)timeri->callback_data;
 145         seq_timer_t *tmr;
 146
 147         if (q == NULL)
 148                 return;
 149         tmr = q->timer;
 150         if (tmr == NULL)
 151                 return;
 152         if (!tmr->running)
 153                 return;
 154
 155         resolution *= ticks;
 156         if (tmr->skew != tmr->skew_base) {
 157                 /* FIXME: assuming skew_base = 0x10000 */
 158                 resolution = (resolution >> 16) * tmr->skew +
 159                         (((resolution & 0xffff) * tmr->skew) >> 16);
 160         }
 161
 162         spin_lock_irqsave(&tmr->lock, flags);
 163
 164         /* update timer */
 165         snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
 166
 167         /* calculate current tick */
 168         snd_seq_timer_update_tick(&tmr->tick, resolution);
 169
 170         /* register actual time of this timer update */
 171         do_gettimeofday(&tmr->last_update);
 172
 173         spin_unlock_irqrestore(&tmr->lock, flags);
 174
 175         /* check queues and dispatch events */
 176         snd_seq_check_queue(q, 1, 0);
 177 }
 178
 179 /* set current tempo */
 180 int snd_seq_timer_set_tempo(seq_timer_t * tmr, int tempo)
 181 {
 182         unsigned long flags;
 183
 184         snd_assert(tmr, return -EINVAL);
 185         if (tempo <= 0)
 186                 return -EINVAL;
 187         spin_lock_irqsave(&tmr->lock, flags);
 188         if ((unsigned int)tempo != tmr->tempo) {
 189                 tmr->tempo = tempo;
 190                 snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq);
 191         }
 192         spin_unlock_irqrestore(&tmr->lock, flags);
 193         return 0;
 194 }
 195
 196 /* set current ppq */
 197 int snd_seq_timer_set_ppq(seq_timer_t * tmr, int ppq)
 198 {
 199         unsigned long flags;
 200
 201         snd_assert(tmr, return -EINVAL);
 202         if (ppq <= 0)
 203                 return -EINVAL;
 204         spin_lock_irqsave(&tmr->lock, flags);
 205         if (tmr->running && (ppq != tmr->ppq)) {
 206                 /* refuse to change ppq on running timers */
 207                 /* because it will upset the song position (ticks) */
 208                 spin_unlock_irqrestore(&tmr->lock, flags);
 209                 snd_printd("seq: cannot change ppq of a running timer\n");
 210                 return -EBUSY;
 211         }
 212
 213         tmr->ppq = ppq;
 214         snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq);
 215         spin_unlock_irqrestore(&tmr->lock, flags);
 216         return 0;
 217 }
 218
 219 /* set current tick position */
 220 int snd_seq_timer_set_position_tick(seq_timer_t *tmr, snd_seq_tick_time_t position)
 221 {
 222         unsigned long flags;
 223
 224         snd_assert(tmr, return -EINVAL);
 225
 226         spin_lock_irqsave(&tmr->lock, flags);
 227         tmr->tick.cur_tick = position;
 228         tmr->tick.fraction = 0;
 229         spin_unlock_irqrestore(&tmr->lock, flags);
 230         return 0;
 231 }
 232
 233 /* set current real-time position */
 234 int snd_seq_timer_set_position_time(seq_timer_t *tmr, snd_seq_real_time_t position)
 235 {
 236         unsigned long flags;
 237
 238         snd_assert(tmr, return -EINVAL);
 239
 240         snd_seq_sanity_real_time(&position);
 241         spin_lock_irqsave(&tmr->lock, flags);
 242         tmr->cur_time = position;
 243         spin_unlock_irqrestore(&tmr->lock, flags);
 244         return 0;
 245 }
 246
 247 /* set timer skew */
 248 int snd_seq_timer_set_skew(seq_timer_t *tmr, unsigned int skew, unsigned int base)
 249 {
 250         unsigned long flags;
 251
 252         snd_assert(tmr, return -EINVAL);
 253
 254         /* FIXME */
 255         if (base != SKEW_BASE) {
 256                 snd_printd("invalid skew base 0x%x\n", base);
 257                 return -EINVAL;
 258         }
 259         spin_lock_irqsave(&tmr->lock, flags);
 260         tmr->skew = skew;
 261         spin_unlock_irqrestore(&tmr->lock, flags);
 262         return 0;
 263 }
 264
 265 int snd_seq_timer_open(queue_t *q)
 266 {
 267         snd_timer_instance_t *t;
 268         seq_timer_t *tmr;
 269         char str[32];
 270         int err;
 271
 272         tmr = q->timer;
 273         snd_assert(tmr != NULL, return -EINVAL);
 274         if (tmr->timeri)
 275                 return -EBUSY;
 276         sprintf(str, "sequencer queue %i", q->queue);
 277         if (tmr->type != SNDRV_SEQ_TIMER_ALSA)  /* standard ALSA timer */
 278                 return -EINVAL;
 279         if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
 280                 tmr->alsa_id.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
 281         err = snd_timer_open(&t, str, &tmr->alsa_id, q->queue);
 282         if (err < 0 && tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE) {
 283                 if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_GLOBAL ||
 284                     tmr->alsa_id.device != SNDRV_TIMER_GLOBAL_SYSTEM) {
 285                         snd_timer_id_t tid;
 286                         memset(&tid, 0, sizeof(tid));
 287                         tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
 288                         tid.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
 289                         tid.card = -1;
 290                         tid.device = SNDRV_TIMER_GLOBAL_SYSTEM;
 291                         err = snd_timer_open(&t, str, &tid, q->queue);
 292                 }
 293                 if (err < 0) {
 294                         snd_printk(KERN_ERR "seq fatal error: cannot create timer (%i)\n", err);
 295                         return err;
 296                 }
 297         }
 298         t->callback = snd_seq_timer_interrupt;
 299         t->callback_data = q;
 300         t->flags |= SNDRV_TIMER_IFLG_AUTO;
 301         tmr->timeri = t;
 302         return 0;
 303 }
 304
 305 int snd_seq_timer_close(queue_t *q)
 306 {
 307         seq_timer_t *tmr;
 308
 309         tmr = q->timer;
 310         snd_assert(tmr != NULL, return -EINVAL);
 311         if (tmr->timeri) {
 312                 snd_timer_stop(tmr->timeri);
 313                 snd_timer_close(tmr->timeri);
 314                 tmr->timeri = NULL;
 315         }
 316         return 0;
 317 }
 318
 319 int snd_seq_timer_stop(seq_timer_t * tmr)
 320 {
 321         if (! tmr->timeri)
 322                 return -EINVAL;
 323         if (!tmr->running)
 324                 return 0;
 325         tmr->running = 0;
 326         snd_timer_pause(tmr->timeri);
 327         return 0;
 328 }
 329
 330 static int initialize_timer(seq_timer_t *tmr)
 331 {
 332         snd_timer_t *t;
 333         unsigned long freq;
 334
 335         t = tmr->timeri->timer;
 336         snd_assert(t, return -EINVAL);
 337
 338         freq = tmr->preferred_resolution;
 339         if (!freq)
 340                 freq = DEFAULT_FREQUENCY;
 341         else if (freq < MIN_FREQUENCY)
 342                 freq = MIN_FREQUENCY;
 343         else if (freq > MAX_FREQUENCY)
 344                 freq = MAX_FREQUENCY;
 345
 346         tmr->ticks = 1;
 347         if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
 348                 unsigned long r = t->hw.resolution;
 349                 if (! r && t->hw.c_resolution)
 350                         r = t->hw.c_resolution(t);
 351                 if (r) {
 352                         tmr->ticks = (unsigned int)(1000000000uL / (r * freq));
 353                         if (! tmr->ticks)
 354                                 tmr->ticks = 1;
 355                 }
 356         }
 357         tmr->initialized = 1;
 358         return 0;
 359 }
 360
 361 int snd_seq_timer_start(seq_timer_t * tmr)
 362 {
 363         if (! tmr->timeri)
 364                 return -EINVAL;
 365         if (tmr->running)
 366                 snd_seq_timer_stop(tmr);
 367         snd_seq_timer_reset(tmr);
 368         if (initialize_timer(tmr) < 0)
 369                 return -EINVAL;
 370         snd_timer_start(tmr->timeri, tmr->ticks);
 371         tmr->running = 1;
 372         do_gettimeofday(&tmr->last_update);
 373         return 0;
 374 }
 375
 376 int snd_seq_timer_continue(seq_timer_t * tmr)
 377 {
 378         if (! tmr->timeri)
 379                 return -EINVAL;
 380         if (tmr->running)
 381                 return -EBUSY;
 382         if (! tmr->initialized) {
 383                 snd_seq_timer_reset(tmr);
 384                 if (initialize_timer(tmr) < 0)
 385                         return -EINVAL;
 386         }
 387         snd_timer_start(tmr->timeri, tmr->ticks);
 388         tmr->running = 1;
 389         do_gettimeofday(&tmr->last_update);
 390         return 0;
 391 }
 392
 393 /* return current 'real' time. use timeofday() to get better granularity. */
 394 snd_seq_real_time_t snd_seq_timer_get_cur_time(seq_timer_t *tmr)
 395 {
 396         snd_seq_real_time_t cur_time;
 397
 398         cur_time = tmr->cur_time;
 399         if (tmr->running) {
 400                 struct timeval tm;
 401                 int usec;
 402                 do_gettimeofday(&tm);
 403                 usec = (int)(tm.tv_usec - tmr->last_update.tv_usec);
 404                 if (usec < 0) {
 405                         cur_time.tv_nsec += (1000000 + usec) * 1000;
 406                         cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec - 1;
 407                 } else {
 408                         cur_time.tv_nsec += usec * 1000;
 409                         cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec;
 410                 }
 411                 snd_seq_sanity_real_time(&cur_time);
 412         }
 413
 414         return cur_time;
 415 }
 416
 417 /* TODO: use interpolation on tick queue (will only be useful for very
 418  high PPQ values) */
 419 snd_seq_tick_time_t snd_seq_timer_get_cur_tick(seq_timer_t *tmr)
 420 {
 421         return tmr->tick.cur_tick;
 422 }
 423
 424
 425 /* exported to seq_info.c */
 426 void snd_seq_info_timer_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
 427 {
 428         int idx;
 429         queue_t *q;
 430         seq_timer_t *tmr;
 431         snd_timer_instance_t *ti;
 432         unsigned long resolution;
 433
 434         for (idx = 0; idx < SNDRV_SEQ_MAX_QUEUES; idx++) {
 435                 q = queueptr(idx);
 436                 if (q == NULL)
 437                         continue;
 438                 if ((tmr = q->timer) == NULL ||
 439                     (ti = tmr->timeri) == NULL) {
 440                         queuefree(q);
 441                         continue;
 442                 }
 443                 snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
 444                 resolution = snd_timer_resolution(ti) * tmr->ticks;
 445                 snd_iprintf(buffer, "  Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
 446                 snd_iprintf(buffer, "  Skew : %u / %u\n", tmr->skew, tmr->skew_base);
 447                 queuefree(q);
 448         }
 449 }