aboutsummaryrefslogtreecommitdiff
path: root/sound/isa/sb/emu8000_callback.c
blob: 7609a5b640cb64c22287025eca63a5dd71205521 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  synth callback routines for the emu8000 (AWE32/64)
 *
 *  Copyright (C) 1999 Steve Ratcliffe
 *  Copyright (C) 1999-2000 Takashi Iwai <tiwai@suse.de>
 */

#include "emu8000_local.h"
#include <linux/export.h>
#include <sound/asoundef.h>

/*
 * prototypes
 */
static struct snd_emux_voice *get_voice(struct snd_emux *emu,
					struct snd_emux_port *port);
static int start_voice(struct snd_emux_voice *vp);
static void trigger_voice(struct snd_emux_voice *vp);
static void release_voice(struct snd_emux_voice *vp);
static void update_voice(struct snd_emux_voice *vp, int update);
static void reset_voice(struct snd_emux *emu, int ch);
static void terminate_voice(struct snd_emux_voice *vp);
static void sysex(struct snd_emux *emu, char *buf, int len, int parsed,
		  struct snd_midi_channel_set *chset);
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
static int oss_ioctl(struct snd_emux *emu, int cmd, int p1, int p2);
#endif
static int load_fx(struct snd_emux *emu, int type, int mode,
		   const void __user *buf, long len);

static void set_pitch(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
static void set_volume(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
static void set_pan(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
static void set_fmmod(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
static void set_tremfreq(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
static void set_fm2frq2(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
static void set_filterQ(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
static void snd_emu8000_tweak_voice(struct snd_emu8000 *emu, int ch);

/*
 * Ensure a value is between two points
 * macro evaluates its args more than once, so changed to upper-case.
 */
#define LIMITVALUE(x, a, b) do { if ((x) < (a)) (x) = (a); else if ((x) > (b)) (x) = (b); } while (0)
#define LIMITMAX(x, a) do {if ((x) > (a)) (x) = (a); } while (0)


/*
 * set up operators
 */
static const struct snd_emux_operators emu8000_ops = {
	.owner =	THIS_MODULE,
	.get_voice =	get_voice,
	.prepare =	start_voice,
	.trigger =	trigger_voice,
	.release =	release_voice,
	.update =	update_voice,
	.terminate =	terminate_voice,
	.reset =	reset_voice,
	.sample_new =	snd_emu8000_sample_new,
	.sample_free =	snd_emu8000_sample_free,
	.sample_reset = snd_emu8000_sample_reset,
	.load_fx =	load_fx,
	.sysex =	sysex,
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
	.oss_ioctl =	oss_ioctl,
#endif
};

void
snd_emu8000_ops_setup(struct snd_emu8000 *hw)
{
	hw->emu->ops = emu8000_ops;
}



/*
 * Terminate a voice
 */
static void
release_voice(struct snd_emux_voice *vp)
{
	int dcysusv;
	struct snd_emu8000 *hw;

	hw = vp->hw;
	dcysusv = 0x8000 | (unsigned char)vp->reg.parm.modrelease;
	EMU8000_DCYSUS_WRITE(hw, vp->ch, dcysusv);
	dcysusv = 0x8000 | (unsigned char)vp->reg.parm.volrelease;
	EMU8000_DCYSUSV_WRITE(hw, vp->ch, dcysusv);
}


/*
 */
static void
terminate_voice(struct snd_emux_voice *vp)
{
	struct snd_emu8000 *hw; 

	hw = vp->hw;
	EMU8000_DCYSUSV_WRITE(hw, vp->ch, 0x807F);
}


/*
 */
static void
update_voice(struct snd_emux_voice *vp, int update)
{
	struct snd_emu8000 *hw;

	hw = vp->hw;
	if (update & SNDRV_EMUX_UPDATE_VOLUME)
		set_volume(hw, vp);
	if (update & SNDRV_EMUX_UPDATE_PITCH)
		set_pitch(hw, vp);
	if ((update & SNDRV_EMUX_UPDATE_PAN) &&
	    vp->port->ctrls[EMUX_MD_REALTIME_PAN])
		set_pan(hw, vp);
	if (update & SNDRV_EMUX_UPDATE_FMMOD)
		set_fmmod(hw, vp);
	if (update & SNDRV_EMUX_UPDATE_TREMFREQ)
		set_tremfreq(hw, vp);
	if (update & SNDRV_EMUX_UPDATE_FM2FRQ2)
		set_fm2frq2(hw, vp);
	if (update & SNDRV_EMUX_UPDATE_Q)
		set_filterQ(hw, vp);
}


/*
 * Find a channel (voice) within the EMU that is not in use or at least
 * less in use than other channels.  Always returns a valid pointer
 * no matter what.  If there is a real shortage of voices then one
 * will be cut. Such is life.
 *
 * The channel index (vp->ch) must be initialized in this routine.
 * In Emu8k, it is identical with the array index.
 */
static struct snd_emux_voice *
get_voice(struct snd_emux *emu, struct snd_emux_port *port)
{
	int  i;
	struct snd_emux_voice *vp;
	struct snd_emu8000 *hw;

	/* what we are looking for, in order of preference */
	enum {
		OFF=0, RELEASED, PLAYING, END
	};

	/* Keeps track of what we are finding */
	struct best {
		unsigned int  time;
		int voice;
	} best[END];
	struct best *bp;

	hw = emu->hw;

	for (i = 0; i < END; i++) {
		best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */
		best[i].voice = -1;
	}

	/*
	 * Go through them all and get a best one to use.
	 */
	for (i = 0; i < emu->max_voices; i++) {
		int state, val;

		vp = &emu->voices[i];
		state = vp->state;

		if (state == SNDRV_EMUX_ST_OFF)
			bp = best + OFF;
		else if (state == SNDRV_EMUX_ST_RELEASED ||
			 state == SNDRV_EMUX_ST_PENDING) {
			bp = best + RELEASED;
			val = (EMU8000_CVCF_READ(hw, vp->ch) >> 16) & 0xffff;
			if (! val)
				bp = best + OFF;
		}
		else if (state & SNDRV_EMUX_ST_ON)
			bp = best + PLAYING;
		else
			continue;

		/* check if sample is finished playing (non-looping only) */
		if (state != SNDRV_EMUX_ST_OFF &&
		    (vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_SINGLESHOT)) {
			val = EMU8000_CCCA_READ(hw, vp->ch) & 0xffffff;
			if (val >= vp->reg.loopstart)
				bp = best + OFF;
		}

		if (vp->time < bp->time) {
			bp->time = vp->time;
			bp->voice = i;
		}
	}

	for (i = 0; i < END; i++) {
		if (best[i].voice >= 0) {
			vp = &emu->voices[best[i].voice];
			vp->ch = best[i].voice;
			return vp;
		}
	}

	/* not found */
	return NULL;
}

/*
 */
static int
start_voice(struct snd_emux_voice *vp)
{
	unsigned int temp;
	int ch;
	int addr;
	struct snd_midi_channel *chan;
	struct snd_emu8000 *hw;

	hw = vp->hw;
	ch = vp->ch;
	chan = vp->chan;

	/* channel to be silent and idle */
	EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
	EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
	EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
	EMU8000_PTRX_WRITE(hw, ch, 0);
	EMU8000_CPF_WRITE(hw, ch, 0);

	/* set pitch offset */
	set_pitch(hw, vp);

	/* set envelope parameters */
	EMU8000_ENVVAL_WRITE(hw, ch, vp->reg.parm.moddelay);
	EMU8000_ATKHLD_WRITE(hw, ch, vp->reg.parm.modatkhld);
	EMU8000_DCYSUS_WRITE(hw, ch, vp->reg.parm.moddcysus);
	EMU8000_ENVVOL_WRITE(hw, ch, vp->reg.parm.voldelay);
	EMU8000_ATKHLDV_WRITE(hw, ch, vp->reg.parm.volatkhld);
	/* decay/sustain parameter for volume envelope is used
	   for triggerg the voice */

	/* cutoff and volume */
	set_volume(hw, vp);

	/* modulation envelope heights */
	EMU8000_PEFE_WRITE(hw, ch, vp->reg.parm.pefe);

	/* lfo1/2 delay */
	EMU8000_LFO1VAL_WRITE(hw, ch, vp->reg.parm.lfo1delay);
	EMU8000_LFO2VAL_WRITE(hw, ch, vp->reg.parm.lfo2delay);

	/* lfo1 pitch & cutoff shift */
	set_fmmod(hw, vp);
	/* lfo1 volume & freq */
	set_tremfreq(hw, vp);
	/* lfo2 pitch & freq */
	set_fm2frq2(hw, vp);
	/* pan & loop start */
	set_pan(hw, vp);

	/* chorus & loop end (chorus 8bit, MSB) */
	addr = vp->reg.loopend - 1;
	temp = vp->reg.parm.chorus;
	temp += (int)chan->control[MIDI_CTL_E3_CHORUS_DEPTH] * 9 / 10;
	LIMITMAX(temp, 255);
	temp = (temp <<24) | (unsigned int)addr;
	EMU8000_CSL_WRITE(hw, ch, temp);

	/* Q & current address (Q 4bit value, MSB) */
	addr = vp->reg.start - 1;
	temp = vp->reg.parm.filterQ;
	temp = (temp<<28) | (unsigned int)addr;
	EMU8000_CCCA_WRITE(hw, ch, temp);

	/* clear unknown registers */
	EMU8000_00A0_WRITE(hw, ch, 0);
	EMU8000_0080_WRITE(hw, ch, 0);

	/* reset volume */
	temp = vp->vtarget << 16;
	EMU8000_VTFT_WRITE(hw, ch, temp | vp->ftarget);
	EMU8000_CVCF_WRITE(hw, ch, temp | 0xff00);

	return 0;
}

/*
 * Start envelope
 */
static void
trigger_voice(struct snd_emux_voice *vp)
{
	int ch = vp->ch;
	unsigned int temp;
	struct snd_emu8000 *hw;

	hw = vp->hw;

	/* set reverb and pitch target */
	temp = vp->reg.parm.reverb;
	temp += (int)vp->chan->control[MIDI_CTL_E1_REVERB_DEPTH] * 9 / 10;
	LIMITMAX(temp, 255);
	temp = (temp << 8) | (vp->ptarget << 16) | vp->aaux;
	EMU8000_PTRX_WRITE(hw, ch, temp);
	EMU8000_CPF_WRITE(hw, ch, vp->ptarget << 16);
	EMU8000_DCYSUSV_WRITE(hw, ch, vp->reg.parm.voldcysus);
}

/*
 * reset voice parameters
 */
static void
reset_voice(struct snd_emux *emu, int ch)
{
	struct snd_emu8000 *hw;

	hw = emu->hw;
	EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
	snd_emu8000_tweak_voice(hw, ch);
}

/*
 * Set the pitch of a possibly playing note.
 */
static void
set_pitch(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
{
	EMU8000_IP_WRITE(hw, vp->ch, vp->apitch);
}

/*
 * Set the volume of a possibly already playing note
 */
static void
set_volume(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
{
	int  ifatn;

	ifatn = (unsigned char)vp->acutoff;
	ifatn = (ifatn << 8);
	ifatn |= (unsigned char)vp->avol;
	EMU8000_IFATN_WRITE(hw, vp->ch, ifatn);
}

/*
 * Set pan and loop start address.
 */
static void
set_pan(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
{
	unsigned int temp;

	temp = ((unsigned int)vp->apan<<24) | ((unsigned int)vp->reg.loopstart - 1);
	EMU8000_PSST_WRITE(hw, vp->ch, temp);
}

#define MOD_SENSE 18

static void
set_fmmod(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
{
	unsigned short fmmod;
	short pitch;
	unsigned char cutoff;
	int modulation;

	pitch = (char)(vp->reg.parm.fmmod>>8);
	cutoff = (vp->reg.parm.fmmod & 0xff);
	modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
	pitch += (MOD_SENSE * modulation) / 1200;
	LIMITVALUE(pitch, -128, 127);
	fmmod = ((unsigned char)pitch<<8) | cutoff;
	EMU8000_FMMOD_WRITE(hw, vp->ch, fmmod);
}

/* set tremolo (lfo1) volume & frequency */
static void
set_tremfreq(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
{
	EMU8000_TREMFRQ_WRITE(hw, vp->ch, vp->reg.parm.tremfrq);
}

/* set lfo2 pitch & frequency */
static void
set_fm2frq2(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
{
	unsigned short fm2frq2;
	short pitch;
	unsigned char freq;
	int modulation;

	pitch = (char)(vp->reg.parm.fm2frq2>>8);
	freq = vp->reg.parm.fm2frq2 & 0xff;
	modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
	pitch += (MOD_SENSE * modulation) / 1200;
	LIMITVALUE(pitch, -128, 127);
	fm2frq2 = ((unsigned char)pitch<<8) | freq;
	EMU8000_FM2FRQ2_WRITE(hw, vp->ch, fm2frq2);
}

/* set filterQ */
static void
set_filterQ(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
{
	unsigned int addr;
	addr = EMU8000_CCCA_READ(hw, vp->ch) & 0xffffff;
	addr |= (vp->reg.parm.filterQ << 28);
	EMU8000_CCCA_WRITE(hw, vp->ch, addr);
}

/*
 * set the envelope & LFO parameters to the default values
 */
static void
snd_emu8000_tweak_voice(struct snd_emu8000 *emu, int i)
{
	/* set all mod/vol envelope shape to minimum */
	EMU8000_ENVVOL_WRITE(emu, i, 0x8000);
	EMU8000_ENVVAL_WRITE(emu, i, 0x8000);
	EMU8000_DCYSUS_WRITE(emu, i, 0x7F7F);
	EMU8000_ATKHLDV_WRITE(emu, i, 0x7F7F);
	EMU8000_ATKHLD_WRITE(emu, i, 0x7F7F);
	EMU8000_PEFE_WRITE(emu, i, 0);  /* mod envelope height to zero */
	EMU8000_LFO1VAL_WRITE(emu, i, 0x8000); /* no delay for LFO1 */
	EMU8000_LFO2VAL_WRITE(emu, i, 0x8000);
	EMU8000_IP_WRITE(emu, i, 0xE000);	/* no pitch shift */
	EMU8000_IFATN_WRITE(emu, i, 0xFF00);	/* volume to minimum */
	EMU8000_FMMOD_WRITE(emu, i, 0);
	EMU8000_TREMFRQ_WRITE(emu, i, 0);
	EMU8000_FM2FRQ2_WRITE(emu, i, 0);
}

/*
 * sysex callback
 */
static void
sysex(struct snd_emux *emu, char *buf, int len, int parsed, struct snd_midi_channel_set *chset)
{
	struct snd_emu8000 *hw;

	hw = emu->hw;

	switch (parsed) {
	case SNDRV_MIDI_SYSEX_GS_CHORUS_MODE:
		hw->chorus_mode = chset->gs_chorus_mode;
		snd_emu8000_update_chorus_mode(hw);
		break;

	case SNDRV_MIDI_SYSEX_GS_REVERB_MODE:
		hw->reverb_mode = chset->gs_reverb_mode;
		snd_emu8000_update_reverb_mode(hw);
		break;
	}
}


#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
/*
 * OSS ioctl callback
 */
static int
oss_ioctl(struct snd_emux *emu, int cmd, int p1, int p2)
{
	struct snd_emu8000 *hw;

	hw = emu->hw;

	switch (cmd) {
	case _EMUX_OSS_REVERB_MODE:
		hw->reverb_mode = p1;
		snd_emu8000_update_reverb_mode(hw);
		break;

	case _EMUX_OSS_CHORUS_MODE:
		hw->chorus_mode = p1;
		snd_emu8000_update_chorus_mode(hw);
		break;

	case _EMUX_OSS_INITIALIZE_CHIP:
		/* snd_emu8000_init(hw); */ /*ignored*/
		break;

	case _EMUX_OSS_EQUALIZER:
		hw->bass_level = p1;
		hw->treble_level = p2;
		snd_emu8000_update_equalizer(hw);
		break;
	}
	return 0;
}
#endif


/*
 * additional patch keys
 */

#define SNDRV_EMU8000_LOAD_CHORUS_FX	0x10	/* optarg=mode */
#define SNDRV_EMU8000_LOAD_REVERB_FX	0x11	/* optarg=mode */


/*
 * callback routine
 */

static int
load_fx(struct snd_emux *emu, int type, int mode, const void __user *buf, long len)
{
	struct snd_emu8000 *hw;
	hw = emu->hw;

	/* skip header */
	buf += 16;
	len -= 16;

	switch (type) {
	case SNDRV_EMU8000_LOAD_CHORUS_FX:
		return snd_emu8000_load_chorus_fx(hw, mode, buf, len);
	case SNDRV_EMU8000_LOAD_REVERB_FX:
		return snd_emu8000_load_reverb_fx(hw, mode, buf, len);
	}
	return -EINVAL;
}