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emu8000_callback.c
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1 /*
2  * synth callback routines for the emu8000 (AWE32/64)
3  *
4  * Copyright (C) 1999 Steve Ratcliffe
5  * Copyright (C) 1999-2000 Takashi Iwai <[email protected]>
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 #include "emu8000_local.h"
23 #include <linux/export.h>
24 #include <sound/asoundef.h>
25 
26 /*
27  * prototypes
28  */
29 static struct snd_emux_voice *get_voice(struct snd_emux *emu,
30  struct snd_emux_port *port);
31 static int start_voice(struct snd_emux_voice *vp);
32 static void trigger_voice(struct snd_emux_voice *vp);
33 static void release_voice(struct snd_emux_voice *vp);
34 static void update_voice(struct snd_emux_voice *vp, int update);
35 static void reset_voice(struct snd_emux *emu, int ch);
36 static void terminate_voice(struct snd_emux_voice *vp);
37 static void sysex(struct snd_emux *emu, char *buf, int len, int parsed,
38  struct snd_midi_channel_set *chset);
39 #ifdef CONFIG_SND_SEQUENCER_OSS
40 static int oss_ioctl(struct snd_emux *emu, int cmd, int p1, int p2);
41 #endif
42 static int load_fx(struct snd_emux *emu, int type, int mode,
43  const void __user *buf, long len);
44 
45 static void set_pitch(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
46 static void set_volume(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
47 static void set_pan(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
48 static void set_fmmod(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
49 static void set_tremfreq(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
50 static void set_fm2frq2(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
51 static void set_filterQ(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
52 static void snd_emu8000_tweak_voice(struct snd_emu8000 *emu, int ch);
53 
54 /*
55  * Ensure a value is between two points
56  * macro evaluates its args more than once, so changed to upper-case.
57  */
58 #define LIMITVALUE(x, a, b) do { if ((x) < (a)) (x) = (a); else if ((x) > (b)) (x) = (b); } while (0)
59 #define LIMITMAX(x, a) do {if ((x) > (a)) (x) = (a); } while (0)
60 
61 
62 /*
63  * set up operators
64  */
65 static struct snd_emux_operators emu8000_ops = {
66  .owner = THIS_MODULE,
67  .get_voice = get_voice,
68  .prepare = start_voice,
69  .trigger = trigger_voice,
70  .release = release_voice,
71  .update = update_voice,
72  .terminate = terminate_voice,
73  .reset = reset_voice,
74  .sample_new = snd_emu8000_sample_new,
75  .sample_free = snd_emu8000_sample_free,
76  .sample_reset = snd_emu8000_sample_reset,
77  .load_fx = load_fx,
78  .sysex = sysex,
79 #ifdef CONFIG_SND_SEQUENCER_OSS
80  .oss_ioctl = oss_ioctl,
81 #endif
82 };
83 
84 void
86 {
87  hw->emu->ops = emu8000_ops;
88 }
89 
90 
91 
92 /*
93  * Terminate a voice
94  */
95 static void
96 release_voice(struct snd_emux_voice *vp)
97 {
98  int dcysusv;
99  struct snd_emu8000 *hw;
100 
101  hw = vp->hw;
102  dcysusv = 0x8000 | (unsigned char)vp->reg.parm.modrelease;
103  EMU8000_DCYSUS_WRITE(hw, vp->ch, dcysusv);
104  dcysusv = 0x8000 | (unsigned char)vp->reg.parm.volrelease;
105  EMU8000_DCYSUSV_WRITE(hw, vp->ch, dcysusv);
106 }
107 
108 
109 /*
110  */
111 static void
112 terminate_voice(struct snd_emux_voice *vp)
113 {
114  struct snd_emu8000 *hw;
115 
116  hw = vp->hw;
117  EMU8000_DCYSUSV_WRITE(hw, vp->ch, 0x807F);
118 }
119 
120 
121 /*
122  */
123 static void
124 update_voice(struct snd_emux_voice *vp, int update)
125 {
126  struct snd_emu8000 *hw;
127 
128  hw = vp->hw;
129  if (update & SNDRV_EMUX_UPDATE_VOLUME)
130  set_volume(hw, vp);
131  if (update & SNDRV_EMUX_UPDATE_PITCH)
132  set_pitch(hw, vp);
133  if ((update & SNDRV_EMUX_UPDATE_PAN) &&
134  vp->port->ctrls[EMUX_MD_REALTIME_PAN])
135  set_pan(hw, vp);
136  if (update & SNDRV_EMUX_UPDATE_FMMOD)
137  set_fmmod(hw, vp);
138  if (update & SNDRV_EMUX_UPDATE_TREMFREQ)
139  set_tremfreq(hw, vp);
140  if (update & SNDRV_EMUX_UPDATE_FM2FRQ2)
141  set_fm2frq2(hw, vp);
142  if (update & SNDRV_EMUX_UPDATE_Q)
143  set_filterQ(hw, vp);
144 }
145 
146 
147 /*
148  * Find a channel (voice) within the EMU that is not in use or at least
149  * less in use than other channels. Always returns a valid pointer
150  * no matter what. If there is a real shortage of voices then one
151  * will be cut. Such is life.
152  *
153  * The channel index (vp->ch) must be initialized in this routine.
154  * In Emu8k, it is identical with the array index.
155  */
156 static struct snd_emux_voice *
157 get_voice(struct snd_emux *emu, struct snd_emux_port *port)
158 {
159  int i;
160  struct snd_emux_voice *vp;
161  struct snd_emu8000 *hw;
162 
163  /* what we are looking for, in order of preference */
164  enum {
165  OFF=0, RELEASED, PLAYING, END
166  };
167 
168  /* Keeps track of what we are finding */
169  struct best {
170  unsigned int time;
171  int voice;
172  } best[END];
173  struct best *bp;
174 
175  hw = emu->hw;
176 
177  for (i = 0; i < END; i++) {
178  best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */
179  best[i].voice = -1;
180  }
181 
182  /*
183  * Go through them all and get a best one to use.
184  */
185  for (i = 0; i < emu->max_voices; i++) {
186  int state, val;
187 
188  vp = &emu->voices[i];
189  state = vp->state;
190 
191  if (state == SNDRV_EMUX_ST_OFF)
192  bp = best + OFF;
193  else if (state == SNDRV_EMUX_ST_RELEASED ||
194  state == SNDRV_EMUX_ST_PENDING) {
195  bp = best + RELEASED;
196  val = (EMU8000_CVCF_READ(hw, vp->ch) >> 16) & 0xffff;
197  if (! val)
198  bp = best + OFF;
199  }
200  else if (state & SNDRV_EMUX_ST_ON)
201  bp = best + PLAYING;
202  else
203  continue;
204 
205  /* check if sample is finished playing (non-looping only) */
206  if (state != SNDRV_EMUX_ST_OFF &&
207  (vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_SINGLESHOT)) {
208  val = EMU8000_CCCA_READ(hw, vp->ch) & 0xffffff;
209  if (val >= vp->reg.loopstart)
210  bp = best + OFF;
211  }
212 
213  if (vp->time < bp->time) {
214  bp->time = vp->time;
215  bp->voice = i;
216  }
217  }
218 
219  for (i = 0; i < END; i++) {
220  if (best[i].voice >= 0) {
221  vp = &emu->voices[best[i].voice];
222  vp->ch = best[i].voice;
223  return vp;
224  }
225  }
226 
227  /* not found */
228  return NULL;
229 }
230 
231 /*
232  */
233 static int
234 start_voice(struct snd_emux_voice *vp)
235 {
236  unsigned int temp;
237  int ch;
238  int addr;
239  struct snd_midi_channel *chan;
240  struct snd_emu8000 *hw;
241 
242  hw = vp->hw;
243  ch = vp->ch;
244  chan = vp->chan;
245 
246  /* channel to be silent and idle */
247  EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
248  EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
249  EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
250  EMU8000_PTRX_WRITE(hw, ch, 0);
251  EMU8000_CPF_WRITE(hw, ch, 0);
252 
253  /* set pitch offset */
254  set_pitch(hw, vp);
255 
256  /* set envelope parameters */
257  EMU8000_ENVVAL_WRITE(hw, ch, vp->reg.parm.moddelay);
258  EMU8000_ATKHLD_WRITE(hw, ch, vp->reg.parm.modatkhld);
259  EMU8000_DCYSUS_WRITE(hw, ch, vp->reg.parm.moddcysus);
260  EMU8000_ENVVOL_WRITE(hw, ch, vp->reg.parm.voldelay);
261  EMU8000_ATKHLDV_WRITE(hw, ch, vp->reg.parm.volatkhld);
262  /* decay/sustain parameter for volume envelope is used
263  for triggerg the voice */
264 
265  /* cutoff and volume */
266  set_volume(hw, vp);
267 
268  /* modulation envelope heights */
269  EMU8000_PEFE_WRITE(hw, ch, vp->reg.parm.pefe);
270 
271  /* lfo1/2 delay */
272  EMU8000_LFO1VAL_WRITE(hw, ch, vp->reg.parm.lfo1delay);
273  EMU8000_LFO2VAL_WRITE(hw, ch, vp->reg.parm.lfo2delay);
274 
275  /* lfo1 pitch & cutoff shift */
276  set_fmmod(hw, vp);
277  /* lfo1 volume & freq */
278  set_tremfreq(hw, vp);
279  /* lfo2 pitch & freq */
280  set_fm2frq2(hw, vp);
281  /* pan & loop start */
282  set_pan(hw, vp);
283 
284  /* chorus & loop end (chorus 8bit, MSB) */
285  addr = vp->reg.loopend - 1;
286  temp = vp->reg.parm.chorus;
287  temp += (int)chan->control[MIDI_CTL_E3_CHORUS_DEPTH] * 9 / 10;
288  LIMITMAX(temp, 255);
289  temp = (temp <<24) | (unsigned int)addr;
290  EMU8000_CSL_WRITE(hw, ch, temp);
291 
292  /* Q & current address (Q 4bit value, MSB) */
293  addr = vp->reg.start - 1;
294  temp = vp->reg.parm.filterQ;
295  temp = (temp<<28) | (unsigned int)addr;
296  EMU8000_CCCA_WRITE(hw, ch, temp);
297 
298  /* clear unknown registers */
299  EMU8000_00A0_WRITE(hw, ch, 0);
300  EMU8000_0080_WRITE(hw, ch, 0);
301 
302  /* reset volume */
303  temp = vp->vtarget << 16;
304  EMU8000_VTFT_WRITE(hw, ch, temp | vp->ftarget);
305  EMU8000_CVCF_WRITE(hw, ch, temp | 0xff00);
306 
307  return 0;
308 }
309 
310 /*
311  * Start envelope
312  */
313 static void
314 trigger_voice(struct snd_emux_voice *vp)
315 {
316  int ch = vp->ch;
317  unsigned int temp;
318  struct snd_emu8000 *hw;
319 
320  hw = vp->hw;
321 
322  /* set reverb and pitch target */
323  temp = vp->reg.parm.reverb;
324  temp += (int)vp->chan->control[MIDI_CTL_E1_REVERB_DEPTH] * 9 / 10;
325  LIMITMAX(temp, 255);
326  temp = (temp << 8) | (vp->ptarget << 16) | vp->aaux;
327  EMU8000_PTRX_WRITE(hw, ch, temp);
328  EMU8000_CPF_WRITE(hw, ch, vp->ptarget << 16);
329  EMU8000_DCYSUSV_WRITE(hw, ch, vp->reg.parm.voldcysus);
330 }
331 
332 /*
333  * reset voice parameters
334  */
335 static void
336 reset_voice(struct snd_emux *emu, int ch)
337 {
338  struct snd_emu8000 *hw;
339 
340  hw = emu->hw;
341  EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
342  snd_emu8000_tweak_voice(hw, ch);
343 }
344 
345 /*
346  * Set the pitch of a possibly playing note.
347  */
348 static void
349 set_pitch(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
350 {
351  EMU8000_IP_WRITE(hw, vp->ch, vp->apitch);
352 }
353 
354 /*
355  * Set the volume of a possibly already playing note
356  */
357 static void
358 set_volume(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
359 {
360  int ifatn;
361 
362  ifatn = (unsigned char)vp->acutoff;
363  ifatn = (ifatn << 8);
364  ifatn |= (unsigned char)vp->avol;
365  EMU8000_IFATN_WRITE(hw, vp->ch, ifatn);
366 }
367 
368 /*
369  * Set pan and loop start address.
370  */
371 static void
372 set_pan(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
373 {
374  unsigned int temp;
375 
376  temp = ((unsigned int)vp->apan<<24) | ((unsigned int)vp->reg.loopstart - 1);
377  EMU8000_PSST_WRITE(hw, vp->ch, temp);
378 }
379 
380 #define MOD_SENSE 18
381 
382 static void
383 set_fmmod(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
384 {
385  unsigned short fmmod;
386  short pitch;
387  unsigned char cutoff;
388  int modulation;
389 
390  pitch = (char)(vp->reg.parm.fmmod>>8);
391  cutoff = (vp->reg.parm.fmmod & 0xff);
392  modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
393  pitch += (MOD_SENSE * modulation) / 1200;
394  LIMITVALUE(pitch, -128, 127);
395  fmmod = ((unsigned char)pitch<<8) | cutoff;
396  EMU8000_FMMOD_WRITE(hw, vp->ch, fmmod);
397 }
398 
399 /* set tremolo (lfo1) volume & frequency */
400 static void
401 set_tremfreq(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
402 {
403  EMU8000_TREMFRQ_WRITE(hw, vp->ch, vp->reg.parm.tremfrq);
404 }
405 
406 /* set lfo2 pitch & frequency */
407 static void
408 set_fm2frq2(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
409 {
410  unsigned short fm2frq2;
411  short pitch;
412  unsigned char freq;
413  int modulation;
414 
415  pitch = (char)(vp->reg.parm.fm2frq2>>8);
416  freq = vp->reg.parm.fm2frq2 & 0xff;
417  modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
418  pitch += (MOD_SENSE * modulation) / 1200;
419  LIMITVALUE(pitch, -128, 127);
420  fm2frq2 = ((unsigned char)pitch<<8) | freq;
421  EMU8000_FM2FRQ2_WRITE(hw, vp->ch, fm2frq2);
422 }
423 
424 /* set filterQ */
425 static void
426 set_filterQ(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
427 {
428  unsigned int addr;
429  addr = EMU8000_CCCA_READ(hw, vp->ch) & 0xffffff;
430  addr |= (vp->reg.parm.filterQ << 28);
431  EMU8000_CCCA_WRITE(hw, vp->ch, addr);
432 }
433 
434 /*
435  * set the envelope & LFO parameters to the default values
436  */
437 static void
438 snd_emu8000_tweak_voice(struct snd_emu8000 *emu, int i)
439 {
440  /* set all mod/vol envelope shape to minimum */
441  EMU8000_ENVVOL_WRITE(emu, i, 0x8000);
442  EMU8000_ENVVAL_WRITE(emu, i, 0x8000);
443  EMU8000_DCYSUS_WRITE(emu, i, 0x7F7F);
444  EMU8000_ATKHLDV_WRITE(emu, i, 0x7F7F);
445  EMU8000_ATKHLD_WRITE(emu, i, 0x7F7F);
446  EMU8000_PEFE_WRITE(emu, i, 0); /* mod envelope height to zero */
447  EMU8000_LFO1VAL_WRITE(emu, i, 0x8000); /* no delay for LFO1 */
448  EMU8000_LFO2VAL_WRITE(emu, i, 0x8000);
449  EMU8000_IP_WRITE(emu, i, 0xE000); /* no pitch shift */
450  EMU8000_IFATN_WRITE(emu, i, 0xFF00); /* volume to minimum */
451  EMU8000_FMMOD_WRITE(emu, i, 0);
452  EMU8000_TREMFRQ_WRITE(emu, i, 0);
453  EMU8000_FM2FRQ2_WRITE(emu, i, 0);
454 }
455 
456 /*
457  * sysex callback
458  */
459 static void
460 sysex(struct snd_emux *emu, char *buf, int len, int parsed, struct snd_midi_channel_set *chset)
461 {
462  struct snd_emu8000 *hw;
463 
464  hw = emu->hw;
465 
466  switch (parsed) {
468  hw->chorus_mode = chset->gs_chorus_mode;
470  break;
471 
473  hw->reverb_mode = chset->gs_reverb_mode;
475  break;
476  }
477 }
478 
479 
480 #ifdef CONFIG_SND_SEQUENCER_OSS
481 /*
482  * OSS ioctl callback
483  */
484 static int
485 oss_ioctl(struct snd_emux *emu, int cmd, int p1, int p2)
486 {
487  struct snd_emu8000 *hw;
488 
489  hw = emu->hw;
490 
491  switch (cmd) {
493  hw->reverb_mode = p1;
495  break;
496 
498  hw->chorus_mode = p1;
500  break;
501 
503  /* snd_emu8000_init(hw); */ /*ignored*/
504  break;
505 
506  case _EMUX_OSS_EQUALIZER:
507  hw->bass_level = p1;
508  hw->treble_level = p2;
510  break;
511  }
512  return 0;
513 }
514 #endif
515 
516 
517 /*
518  * additional patch keys
519  */
520 
521 #define SNDRV_EMU8000_LOAD_CHORUS_FX 0x10 /* optarg=mode */
522 #define SNDRV_EMU8000_LOAD_REVERB_FX 0x11 /* optarg=mode */
523 
524 
525 /*
526  * callback routine
527  */
528 
529 static int
530 load_fx(struct snd_emux *emu, int type, int mode, const void __user *buf, long len)
531 {
532  struct snd_emu8000 *hw;
533  hw = emu->hw;
534 
535  /* skip header */
536  buf += 16;
537  len -= 16;
538 
539  switch (type) {
541  return snd_emu8000_load_chorus_fx(hw, mode, buf, len);
543  return snd_emu8000_load_reverb_fx(hw, mode, buf, len);
544  }
545  return -EINVAL;
546 }
547