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1da177e4 LT |
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 | ||
123992f7 | 39 | static void snd_seq_timer_set_tick_resolution(seq_timer_tick_t *tick, |
bf3b6440 | 40 | int tempo, int ppq) |
1da177e4 LT |
41 | { |
42 | if (tempo < 1000000) | |
43 | tick->resolution = (tempo * 1000) / ppq; | |
44 | else { | |
45 | /* might overflow.. */ | |
46 | unsigned int s; | |
47 | s = tempo % ppq; | |
48 | s = (s * 1000) / ppq; | |
49 | tick->resolution = (tempo / ppq) * 1000; | |
50 | tick->resolution += s; | |
51 | } | |
52 | if (tick->resolution <= 0) | |
53 | tick->resolution = 1; | |
1da177e4 LT |
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 | ||
ecca82b4 | 62 | tmr = kzalloc(sizeof(*tmr), GFP_KERNEL); |
1da177e4 LT |
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 */ | |
bf3b6440 | 102 | snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq); |
1da177e4 LT |
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; | |
bf3b6440 | 185 | snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq); |
1da177e4 LT |
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; | |
bf3b6440 | 209 | snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq); |
1da177e4 LT |
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 | } |