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KEYS: add missing permission check for request_key() destination
[linux/fpc-iii.git] / sound / core / seq / seq_timer.c
bloba2468f1101d16653adc769b3cbb62bd393dde7b0
1 /*
2 * ALSA sequencer Timer
3 * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@perex.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/core.h>
24 #include <linux/slab.h>
25 #include "seq_timer.h"
26 #include "seq_queue.h"
27 #include "seq_info.h"
28
29 /* allowed sequencer timer frequencies, in Hz */
30 #define MIN_FREQUENCY 10
31 #define MAX_FREQUENCY 6250
32 #define DEFAULT_FREQUENCY 1000
33
34 #define SKEW_BASE 0x10000 /* 16bit shift */
35
36 static void snd_seq_timer_set_tick_resolution(struct snd_seq_timer *tmr)
37 {
38 if (tmr->tempo < 1000000)
39 tmr->tick.resolution = (tmr->tempo * 1000) / tmr->ppq;
40 else {
41 /* might overflow.. */
42 unsigned int s;
43 s = tmr->tempo % tmr->ppq;
44 s = (s * 1000) / tmr->ppq;
45 tmr->tick.resolution = (tmr->tempo / tmr->ppq) * 1000;
46 tmr->tick.resolution += s;
47 }
48 if (tmr->tick.resolution <= 0)
49 tmr->tick.resolution = 1;
50 snd_seq_timer_update_tick(&tmr->tick, 0);
51 }
52
53 /* create new timer (constructor) */
54 struct snd_seq_timer *snd_seq_timer_new(void)
55 {
56 struct snd_seq_timer *tmr;
57
58 tmr = kzalloc(sizeof(*tmr), GFP_KERNEL);
59 if (!tmr)
60 return NULL;
61 spin_lock_init(&tmr->lock);
62
63 /* reset setup to defaults */
64 snd_seq_timer_defaults(tmr);
65
66 /* reset time */
67 snd_seq_timer_reset(tmr);
68
69 return tmr;
70 }
71
72 /* delete timer (destructor) */
73 void snd_seq_timer_delete(struct snd_seq_timer **tmr)
74 {
75 struct snd_seq_timer *t = *tmr;
76 *tmr = NULL;
77
78 if (t == NULL) {
79 pr_debug("ALSA: seq: snd_seq_timer_delete() called with NULL timer\n");
80 return;
81 }
82 t->running = 0;
83
84 /* reset time */
85 snd_seq_timer_stop(t);
86 snd_seq_timer_reset(t);
87
88 kfree(t);
89 }
90
91 void snd_seq_timer_defaults(struct snd_seq_timer * tmr)
92 {
93 unsigned long flags;
94
95 spin_lock_irqsave(&tmr->lock, flags);
96 /* setup defaults */
97 tmr->ppq = 96; /* 96 PPQ */
98 tmr->tempo = 500000; /* 120 BPM */
99 snd_seq_timer_set_tick_resolution(tmr);
100 tmr->running = 0;
101
102 tmr->type = SNDRV_SEQ_TIMER_ALSA;
103 tmr->alsa_id.dev_class = seq_default_timer_class;
104 tmr->alsa_id.dev_sclass = seq_default_timer_sclass;
105 tmr->alsa_id.card = seq_default_timer_card;
106 tmr->alsa_id.device = seq_default_timer_device;
107 tmr->alsa_id.subdevice = seq_default_timer_subdevice;
108 tmr->preferred_resolution = seq_default_timer_resolution;
109
110 tmr->skew = tmr->skew_base = SKEW_BASE;
111 spin_unlock_irqrestore(&tmr->lock, flags);
112 }
113
114 static void seq_timer_reset(struct snd_seq_timer *tmr)
115 {
116 /* reset time & songposition */
117 tmr->cur_time.tv_sec = 0;
118 tmr->cur_time.tv_nsec = 0;
119
120 tmr->tick.cur_tick = 0;
121 tmr->tick.fraction = 0;
122 }
123
124 void snd_seq_timer_reset(struct snd_seq_timer *tmr)
125 {
126 unsigned long flags;
127
128 spin_lock_irqsave(&tmr->lock, flags);
129 seq_timer_reset(tmr);
130 spin_unlock_irqrestore(&tmr->lock, flags);
131 }
132
133
134 /* called by timer interrupt routine. the period time since previous invocation is passed */
135 static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
136 unsigned long resolution,
137 unsigned long ticks)
138 {
139 unsigned long flags;
140 struct snd_seq_queue *q = timeri->callback_data;
141 struct snd_seq_timer *tmr;
142
143 if (q == NULL)
144 return;
145 tmr = q->timer;
146 if (tmr == NULL)
147 return;
148 spin_lock_irqsave(&tmr->lock, flags);
149 if (!tmr->running) {
150 spin_unlock_irqrestore(&tmr->lock, flags);
151 return;
152 }
153
154 resolution *= ticks;
155 if (tmr->skew != tmr->skew_base) {
156 /* FIXME: assuming skew_base = 0x10000 */
157 resolution = (resolution >> 16) * tmr->skew +
158 (((resolution & 0xffff) * tmr->skew) >> 16);
159 }
160
161 /* update timer */
162 snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
163
164 /* calculate current tick */
165 snd_seq_timer_update_tick(&tmr->tick, resolution);
166
167 /* register actual time of this timer update */
168 do_gettimeofday(&tmr->last_update);
169
170 spin_unlock_irqrestore(&tmr->lock, flags);
171
172 /* check queues and dispatch events */
173 snd_seq_check_queue(q, 1, 0);
174 }
175
176 /* set current tempo */
177 int snd_seq_timer_set_tempo(struct snd_seq_timer * tmr, int tempo)
178 {
179 unsigned long flags;
180
181 if (snd_BUG_ON(!tmr))
182 return -EINVAL;
183 if (tempo <= 0)
184 return -EINVAL;
185 spin_lock_irqsave(&tmr->lock, flags);
186 if ((unsigned int)tempo != tmr->tempo) {
187 tmr->tempo = tempo;
188 snd_seq_timer_set_tick_resolution(tmr);
189 }
190 spin_unlock_irqrestore(&tmr->lock, flags);
191 return 0;
192 }
193
194 /* set current ppq */
195 int snd_seq_timer_set_ppq(struct snd_seq_timer * tmr, int ppq)
196 {
197 unsigned long flags;
198
199 if (snd_BUG_ON(!tmr))
200 return -EINVAL;
201 if (ppq <= 0)
202 return -EINVAL;
203 spin_lock_irqsave(&tmr->lock, flags);
204 if (tmr->running && (ppq != tmr->ppq)) {
205 /* refuse to change ppq on running timers */
206 /* because it will upset the song position (ticks) */
207 spin_unlock_irqrestore(&tmr->lock, flags);
208 pr_debug("ALSA: seq: cannot change ppq of a running timer\n");
209 return -EBUSY;
210 }
211
212 tmr->ppq = ppq;
213 snd_seq_timer_set_tick_resolution(tmr);
214 spin_unlock_irqrestore(&tmr->lock, flags);
215 return 0;
216 }
217
218 /* set current tick position */
219 int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr,
220 snd_seq_tick_time_t position)
221 {
222 unsigned long flags;
223
224 if (snd_BUG_ON(!tmr))
225 return -EINVAL;
226
227 spin_lock_irqsave(&tmr->lock, flags);
228 tmr->tick.cur_tick = position;
229 tmr->tick.fraction = 0;
230 spin_unlock_irqrestore(&tmr->lock, flags);
231 return 0;
232 }
233
234 /* set current real-time position */
235 int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr,
236 snd_seq_real_time_t position)
237 {
238 unsigned long flags;
239
240 if (snd_BUG_ON(!tmr))
241 return -EINVAL;
242
243 snd_seq_sanity_real_time(&position);
244 spin_lock_irqsave(&tmr->lock, flags);
245 tmr->cur_time = position;
246 spin_unlock_irqrestore(&tmr->lock, flags);
247 return 0;
248 }
249
250 /* set timer skew */
251 int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew,
252 unsigned int base)
253 {
254 unsigned long flags;
255
256 if (snd_BUG_ON(!tmr))
257 return -EINVAL;
258
259 /* FIXME */
260 if (base != SKEW_BASE) {
261 pr_debug("ALSA: seq: invalid skew base 0x%x\n", base);
262 return -EINVAL;
263 }
264 spin_lock_irqsave(&tmr->lock, flags);
265 tmr->skew = skew;
266 spin_unlock_irqrestore(&tmr->lock, flags);
267 return 0;
268 }
269
270 int snd_seq_timer_open(struct snd_seq_queue *q)
271 {
272 struct snd_timer_instance *t;
273 struct snd_seq_timer *tmr;
274 char str[32];
275 int err;
276
277 tmr = q->timer;
278 if (snd_BUG_ON(!tmr))
279 return -EINVAL;
280 if (tmr->timeri)
281 return -EBUSY;
282 sprintf(str, "sequencer queue %i", q->queue);
283 if (tmr->type != SNDRV_SEQ_TIMER_ALSA) /* standard ALSA timer */
284 return -EINVAL;
285 if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
286 tmr->alsa_id.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
287 err = snd_timer_open(&t, str, &tmr->alsa_id, q->queue);
288 if (err < 0 && tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE) {
289 if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_GLOBAL ||
290 tmr->alsa_id.device != SNDRV_TIMER_GLOBAL_SYSTEM) {
291 struct snd_timer_id tid;
292 memset(&tid, 0, sizeof(tid));
293 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
294 tid.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
295 tid.card = -1;
296 tid.device = SNDRV_TIMER_GLOBAL_SYSTEM;
297 err = snd_timer_open(&t, str, &tid, q->queue);
298 }
299 }
300 if (err < 0) {
301 pr_err("ALSA: seq fatal error: cannot create timer (%i)\n", err);
302 return err;
303 }
304 t->callback = snd_seq_timer_interrupt;
305 t->callback_data = q;
306 t->flags |= SNDRV_TIMER_IFLG_AUTO;
307 spin_lock_irq(&tmr->lock);
308 tmr->timeri = t;
309 spin_unlock_irq(&tmr->lock);
310 return 0;
311 }
312
313 int snd_seq_timer_close(struct snd_seq_queue *q)
314 {
315 struct snd_seq_timer *tmr;
316 struct snd_timer_instance *t;
317
318 tmr = q->timer;
319 if (snd_BUG_ON(!tmr))
320 return -EINVAL;
321 spin_lock_irq(&tmr->lock);
322 t = tmr->timeri;
323 tmr->timeri = NULL;
324 spin_unlock_irq(&tmr->lock);
325 if (t)
326 snd_timer_close(t);
327 return 0;
328 }
329
330 static int seq_timer_stop(struct snd_seq_timer *tmr)
331 {
332 if (! tmr->timeri)
333 return -EINVAL;
334 if (!tmr->running)
335 return 0;
336 tmr->running = 0;
337 snd_timer_pause(tmr->timeri);
338 return 0;
339 }
340
341 int snd_seq_timer_stop(struct snd_seq_timer *tmr)
342 {
343 unsigned long flags;
344 int err;
345
346 spin_lock_irqsave(&tmr->lock, flags);
347 err = seq_timer_stop(tmr);
348 spin_unlock_irqrestore(&tmr->lock, flags);
349 return err;
350 }
351
352 static int initialize_timer(struct snd_seq_timer *tmr)
353 {
354 struct snd_timer *t;
355 unsigned long freq;
356
357 t = tmr->timeri->timer;
358 if (snd_BUG_ON(!t))
359 return -EINVAL;
360
361 freq = tmr->preferred_resolution;
362 if (!freq)
363 freq = DEFAULT_FREQUENCY;
364 else if (freq < MIN_FREQUENCY)
365 freq = MIN_FREQUENCY;
366 else if (freq > MAX_FREQUENCY)
367 freq = MAX_FREQUENCY;
368
369 tmr->ticks = 1;
370 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
371 unsigned long r = t->hw.resolution;
372 if (! r && t->hw.c_resolution)
373 r = t->hw.c_resolution(t);
374 if (r) {
375 tmr->ticks = (unsigned int)(1000000000uL / (r * freq));
376 if (! tmr->ticks)
377 tmr->ticks = 1;
378 }
379 }
380 tmr->initialized = 1;
381 return 0;
382 }
383
384 static int seq_timer_start(struct snd_seq_timer *tmr)
385 {
386 if (! tmr->timeri)
387 return -EINVAL;
388 if (tmr->running)
389 seq_timer_stop(tmr);
390 seq_timer_reset(tmr);
391 if (initialize_timer(tmr) < 0)
392 return -EINVAL;
393 snd_timer_start(tmr->timeri, tmr->ticks);
394 tmr->running = 1;
395 do_gettimeofday(&tmr->last_update);
396 return 0;
397 }
398
399 int snd_seq_timer_start(struct snd_seq_timer *tmr)
400 {
401 unsigned long flags;
402 int err;
403
404 spin_lock_irqsave(&tmr->lock, flags);
405 err = seq_timer_start(tmr);
406 spin_unlock_irqrestore(&tmr->lock, flags);
407 return err;
408 }
409
410 static int seq_timer_continue(struct snd_seq_timer *tmr)
411 {
412 if (! tmr->timeri)
413 return -EINVAL;
414 if (tmr->running)
415 return -EBUSY;
416 if (! tmr->initialized) {
417 seq_timer_reset(tmr);
418 if (initialize_timer(tmr) < 0)
419 return -EINVAL;
420 }
421 snd_timer_start(tmr->timeri, tmr->ticks);
422 tmr->running = 1;
423 do_gettimeofday(&tmr->last_update);
424 return 0;
425 }
426
427 int snd_seq_timer_continue(struct snd_seq_timer *tmr)
428 {
429 unsigned long flags;
430 int err;
431
432 spin_lock_irqsave(&tmr->lock, flags);
433 err = seq_timer_continue(tmr);
434 spin_unlock_irqrestore(&tmr->lock, flags);
435 return err;
436 }
437
438 /* return current 'real' time. use timeofday() to get better granularity. */
439 snd_seq_real_time_t snd_seq_timer_get_cur_time(struct snd_seq_timer *tmr)
440 {
441 snd_seq_real_time_t cur_time;
442 unsigned long flags;
443
444 spin_lock_irqsave(&tmr->lock, flags);
445 cur_time = tmr->cur_time;
446 if (tmr->running) {
447 struct timeval tm;
448 int usec;
449 do_gettimeofday(&tm);
450 usec = (int)(tm.tv_usec - tmr->last_update.tv_usec);
451 if (usec < 0) {
452 cur_time.tv_nsec += (1000000 + usec) * 1000;
453 cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec - 1;
454 } else {
455 cur_time.tv_nsec += usec * 1000;
456 cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec;
457 }
458 snd_seq_sanity_real_time(&cur_time);
459 }
460 spin_unlock_irqrestore(&tmr->lock, flags);
461 return cur_time;
462 }
463
464 /* TODO: use interpolation on tick queue (will only be useful for very
465 high PPQ values) */
466 snd_seq_tick_time_t snd_seq_timer_get_cur_tick(struct snd_seq_timer *tmr)
467 {
468 return tmr->tick.cur_tick;
469 }
470
471
472 #ifdef CONFIG_PROC_FS
473 /* exported to seq_info.c */
474 void snd_seq_info_timer_read(struct snd_info_entry *entry,
475 struct snd_info_buffer *buffer)
476 {
477 int idx;
478 struct snd_seq_queue *q;
479 struct snd_seq_timer *tmr;
480 struct snd_timer_instance *ti;
481 unsigned long resolution;
482
483 for (idx = 0; idx < SNDRV_SEQ_MAX_QUEUES; idx++) {
484 q = queueptr(idx);
485 if (q == NULL)
486 continue;
487 if ((tmr = q->timer) == NULL ||
488 (ti = tmr->timeri) == NULL) {
489 queuefree(q);
490 continue;
491 }
492 snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
493 resolution = snd_timer_resolution(ti) * tmr->ticks;
494 snd_iprintf(buffer, " Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
495 snd_iprintf(buffer, " Skew : %u / %u\n", tmr->skew, tmr->skew_base);
496 queuefree(q);
497 }
498 }
499 #endif /* CONFIG_PROC_FS */
500
Linux with added FPC-III support