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