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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / sound / isa / sb / emu8000_callback.c
blob344b4355be1cd79b898227e5a39661129227f3e9
1 /*
2 * synth callback routines for the emu8000 (AWE32/64)
3 *
4 * Copyright (C) 1999 Steve Ratcliffe
5 * Copyright (C) 1999-2000 Takashi Iwai <tiwai@suse.de>
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
85 snd_emu8000_ops_setup(struct snd_emu8000 *hw)
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) {
467 case SNDRV_MIDI_SYSEX_GS_CHORUS_MODE:
468 hw->chorus_mode = chset->gs_chorus_mode;
469 snd_emu8000_update_chorus_mode(hw);
470 break;
471
472 case SNDRV_MIDI_SYSEX_GS_REVERB_MODE:
473 hw->reverb_mode = chset->gs_reverb_mode;
474 snd_emu8000_update_reverb_mode(hw);
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) {
492 case _EMUX_OSS_REVERB_MODE:
493 hw->reverb_mode = p1;
494 snd_emu8000_update_reverb_mode(hw);
495 break;
496
497 case _EMUX_OSS_CHORUS_MODE:
498 hw->chorus_mode = p1;
499 snd_emu8000_update_chorus_mode(hw);
500 break;
501
502 case _EMUX_OSS_INITIALIZE_CHIP:
503 /* snd_emu8000_init(hw); */ /*ignored*/
504 break;
505
506 case _EMUX_OSS_EQUALIZER:
507 hw->bass_level = p1;
508 hw->treble_level = p2;
509 snd_emu8000_update_equalizer(hw);
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) {
540 case SNDRV_EMU8000_LOAD_CHORUS_FX:
541 return snd_emu8000_load_chorus_fx(hw, mode, buf, len);
542 case SNDRV_EMU8000_LOAD_REVERB_FX:
543 return snd_emu8000_load_reverb_fx(hw, mode, buf, len);
544 }
545 return -EINVAL;
546 }
547