Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Interface for OSS sequencer emulation
 *
 *  Copyright (C) 1999 Takashi Iwai <tiwai@suse.de>
 *
 * Changes
 * 19990227   Steve Ratcliffe   Made separate file and merged in latest
 * 				midi emulation.
 */


#include <linux/export.h>
#include <linux/uaccess.h>
#include <sound/core.h>
#include "emux_voice.h"
#include <sound/asoundef.h>

static int snd_emux_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
static int snd_emux_close_seq_oss(struct snd_seq_oss_arg *arg);
static int snd_emux_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd,
				  unsigned long ioarg);
static int snd_emux_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
				       const char __user *buf, int offs, int count);
static int snd_emux_reset_seq_oss(struct snd_seq_oss_arg *arg);
static int snd_emux_event_oss_input(struct snd_seq_event *ev, int direct,
				    void *private, int atomic, int hop);
static void reset_port_mode(struct snd_emux_port *port, int midi_mode);
static void emuspec_control(struct snd_emux *emu, struct snd_emux_port *port,
			    int cmd, unsigned char *event, int atomic, int hop);
static void gusspec_control(struct snd_emux *emu, struct snd_emux_port *port,
			    int cmd, unsigned char *event, int atomic, int hop);
static void fake_event(struct snd_emux *emu, struct snd_emux_port *port,
		       int ch, int param, int val, int atomic, int hop);

/* operators */
static const struct snd_seq_oss_callback oss_callback = {
	.owner = THIS_MODULE,
	.open = snd_emux_open_seq_oss,
	.close = snd_emux_close_seq_oss,
	.ioctl = snd_emux_ioctl_seq_oss,
	.load_patch = snd_emux_load_patch_seq_oss,
	.reset = snd_emux_reset_seq_oss,
};


/*
 * register OSS synth
 */

void
snd_emux_init_seq_oss(struct snd_emux *emu)
{
	struct snd_seq_oss_reg *arg;
	struct snd_seq_device *dev;

	/* using device#1 here for avoiding conflicts with OPL3 */
	if (snd_seq_device_new(emu->card, 1, SNDRV_SEQ_DEV_ID_OSS,
			       sizeof(struct snd_seq_oss_reg), &dev) < 0)
		return;

	emu->oss_synth = dev;
	strcpy(dev->name, emu->name);
	arg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
	arg->type = SYNTH_TYPE_SAMPLE;
	arg->subtype = SAMPLE_TYPE_AWE32;
	arg->nvoices = emu->max_voices;
	arg->oper = oss_callback;
	arg->private_data = emu;

	/* register to OSS synth table */
	snd_device_register(emu->card, dev);
}


/*
 * unregister
 */
void
snd_emux_detach_seq_oss(struct snd_emux *emu)
{
	if (emu->oss_synth) {
		snd_device_free(emu->card, emu->oss_synth);
		emu->oss_synth = NULL;
	}
}


/* use port number as a unique soundfont client number */
#define SF_CLIENT_NO(p)	((p) + 0x1000)

/*
 * open port for OSS sequencer
 */
static int
snd_emux_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure)
{
	struct snd_emux *emu;
	struct snd_emux_port *p;
	struct snd_seq_port_callback callback;
	char tmpname[64];

	emu = closure;
	if (snd_BUG_ON(!arg || !emu))
		return -ENXIO;

	if (!snd_emux_inc_count(emu))
		return -EFAULT;

	memset(&callback, 0, sizeof(callback));
	callback.owner = THIS_MODULE;
	callback.event_input = snd_emux_event_oss_input;

	sprintf(tmpname, "%s OSS Port", emu->name);
	p = snd_emux_create_port(emu, tmpname, 32,
				 1, &callback);
	if (p == NULL) {
		snd_printk(KERN_ERR "can't create port\n");
		snd_emux_dec_count(emu);
		return -ENOMEM;
	}

	/* fill the argument data */
	arg->private_data = p;
	arg->addr.client = p->chset.client;
	arg->addr.port = p->chset.port;
	p->oss_arg = arg;

	reset_port_mode(p, arg->seq_mode);

	snd_emux_reset_port(p);
	return 0;
}


#define DEFAULT_DRUM_FLAGS	((1<<9) | (1<<25))

/*
 * reset port mode
 */
static void
reset_port_mode(struct snd_emux_port *port, int midi_mode)
{
	if (midi_mode) {
		port->port_mode = SNDRV_EMUX_PORT_MODE_OSS_MIDI;
		port->drum_flags = DEFAULT_DRUM_FLAGS;
		port->volume_atten = 0;
		port->oss_arg->event_passing = SNDRV_SEQ_OSS_PROCESS_KEYPRESS;
	} else {
		port->port_mode = SNDRV_EMUX_PORT_MODE_OSS_SYNTH;
		port->drum_flags = 0;
		port->volume_atten = 32;
		port->oss_arg->event_passing = SNDRV_SEQ_OSS_PROCESS_EVENTS;
	}
}


/*
 * close port
 */
static int
snd_emux_close_seq_oss(struct snd_seq_oss_arg *arg)
{
	struct snd_emux *emu;
	struct snd_emux_port *p;

	if (snd_BUG_ON(!arg))
		return -ENXIO;
	p = arg->private_data;
	if (snd_BUG_ON(!p))
		return -ENXIO;

	emu = p->emu;
	if (snd_BUG_ON(!emu))
		return -ENXIO;

	snd_emux_sounds_off_all(p);
	snd_soundfont_close_check(emu->sflist, SF_CLIENT_NO(p->chset.port));
	snd_seq_event_port_detach(p->chset.client, p->chset.port);
	snd_emux_dec_count(emu);

	return 0;
}


/*
 * load patch
 */
static int
snd_emux_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
			    const char __user *buf, int offs, int count)
{
	struct snd_emux *emu;
	struct snd_emux_port *p;
	int rc;

	if (snd_BUG_ON(!arg))
		return -ENXIO;
	p = arg->private_data;
	if (snd_BUG_ON(!p))
		return -ENXIO;

	emu = p->emu;
	if (snd_BUG_ON(!emu))
		return -ENXIO;

	if (format == GUS_PATCH)
		rc = snd_soundfont_load_guspatch(emu->sflist, buf, count,
						 SF_CLIENT_NO(p->chset.port));
	else if (format == SNDRV_OSS_SOUNDFONT_PATCH) {
		struct soundfont_patch_info patch;
		if (count < (int)sizeof(patch))
			return -EINVAL;
		if (copy_from_user(&patch, buf, sizeof(patch)))
			return -EFAULT;
		if (patch.type >= SNDRV_SFNT_LOAD_INFO &&
		    patch.type <= SNDRV_SFNT_PROBE_DATA)
			rc = snd_soundfont_load(emu->sflist, buf, count, SF_CLIENT_NO(p->chset.port));
		else {
			if (emu->ops.load_fx)
				rc = emu->ops.load_fx(emu, patch.type, patch.optarg, buf, count);
			else
				rc = -EINVAL;
		}
	} else
		rc = 0;
	return rc;
}


/*
 * ioctl
 */
static int
snd_emux_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg)
{
	struct snd_emux_port *p;
	struct snd_emux *emu;

	if (snd_BUG_ON(!arg))
		return -ENXIO;
	p = arg->private_data;
	if (snd_BUG_ON(!p))
		return -ENXIO;

	emu = p->emu;
	if (snd_BUG_ON(!emu))
		return -ENXIO;

	switch (cmd) {
	case SNDCTL_SEQ_RESETSAMPLES:
		snd_soundfont_remove_samples(emu->sflist);
		return 0;
			
	case SNDCTL_SYNTH_MEMAVL:
		if (emu->memhdr)
			return snd_util_mem_avail(emu->memhdr);
		return 0;
	}

	return 0;
}


/*
 * reset device
 */
static int
snd_emux_reset_seq_oss(struct snd_seq_oss_arg *arg)
{
	struct snd_emux_port *p;

	if (snd_BUG_ON(!arg))
		return -ENXIO;
	p = arg->private_data;
	if (snd_BUG_ON(!p))
		return -ENXIO;
	snd_emux_reset_port(p);
	return 0;
}


/*
 * receive raw events: only SEQ_PRIVATE is accepted.
 */
static int
snd_emux_event_oss_input(struct snd_seq_event *ev, int direct, void *private_data,
			 int atomic, int hop)
{
	struct snd_emux *emu;
	struct snd_emux_port *p;
	unsigned char cmd, *data;

	p = private_data;
	if (snd_BUG_ON(!p))
		return -EINVAL;
	emu = p->emu;
	if (snd_BUG_ON(!emu))
		return -EINVAL;
	if (ev->type != SNDRV_SEQ_EVENT_OSS)
		return snd_emux_event_input(ev, direct, private_data, atomic, hop);

	data = ev->data.raw8.d;
	/* only SEQ_PRIVATE is accepted */
	if (data[0] != 0xfe)
		return 0;
	cmd = data[2] & _EMUX_OSS_MODE_VALUE_MASK;
	if (data[2] & _EMUX_OSS_MODE_FLAG)
		emuspec_control(emu, p, cmd, data, atomic, hop);
	else
		gusspec_control(emu, p, cmd, data, atomic, hop);
	return 0;
}


/*
 * OSS/AWE driver specific h/w controls
 */
static void
emuspec_control(struct snd_emux *emu, struct snd_emux_port *port, int cmd,
		unsigned char *event, int atomic, int hop)
{
	int voice;
	unsigned short p1;
	short p2;
	int i;
	struct snd_midi_channel *chan;

	voice = event[3];
	if (voice < 0 || voice >= port->chset.max_channels)
		chan = NULL;
	else
		chan = &port->chset.channels[voice];

	p1 = *(unsigned short *) &event[4];
	p2 = *(short *) &event[6];

	switch (cmd) {
#if 0 /* don't do this atomically */
	case _EMUX_OSS_REMOVE_LAST_SAMPLES:
		snd_soundfont_remove_unlocked(emu->sflist);
		break;
#endif
	case _EMUX_OSS_SEND_EFFECT:
		if (chan)
			snd_emux_send_effect_oss(port, chan, p1, p2);
		break;
		
	case _EMUX_OSS_TERMINATE_ALL:
		snd_emux_terminate_all(emu);
		break;

	case _EMUX_OSS_TERMINATE_CHANNEL:
		/*snd_emux_mute_channel(emu, chan);*/
		break;
	case _EMUX_OSS_RESET_CHANNEL:
		/*snd_emux_channel_init(chset, chan);*/
		break;

	case _EMUX_OSS_RELEASE_ALL:
		fake_event(emu, port, voice, MIDI_CTL_ALL_NOTES_OFF, 0, atomic, hop);
		break;
	case _EMUX_OSS_NOTEOFF_ALL:
		fake_event(emu, port, voice, MIDI_CTL_ALL_SOUNDS_OFF, 0, atomic, hop);
		break;

	case _EMUX_OSS_INITIAL_VOLUME:
		if (p2) {
			port->volume_atten = (short)p1;
			snd_emux_update_port(port, SNDRV_EMUX_UPDATE_VOLUME);
		}
		break;

	case _EMUX_OSS_CHN_PRESSURE:
		if (chan) {
			chan->midi_pressure = p1;
			snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_FMMOD|SNDRV_EMUX_UPDATE_FM2FRQ2);
		}
		break;

	case _EMUX_OSS_CHANNEL_MODE:
		reset_port_mode(port, p1);
		snd_emux_reset_port(port);
		break;

	case _EMUX_OSS_DRUM_CHANNELS:
		port->drum_flags = *(unsigned int*)&event[4];
		for (i = 0; i < port->chset.max_channels; i++) {
			chan = &port->chset.channels[i];
			chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
		}
		break;

	case _EMUX_OSS_MISC_MODE:
		if (p1 < EMUX_MD_END)
			port->ctrls[p1] = p2;
		break;
	case _EMUX_OSS_DEBUG_MODE:
		break;

	default:
		if (emu->ops.oss_ioctl)
			emu->ops.oss_ioctl(emu, cmd, p1, p2);
		break;
	}
}

/*
 * GUS specific h/w controls
 */

#include <linux/ultrasound.h>

static void
gusspec_control(struct snd_emux *emu, struct snd_emux_port *port, int cmd,
		unsigned char *event, int atomic, int hop)
{
	int voice;
	unsigned short p1;
	int plong;
	struct snd_midi_channel *chan;

	if (port->port_mode != SNDRV_EMUX_PORT_MODE_OSS_SYNTH)
		return;
	if (cmd == _GUS_NUMVOICES)
		return;
	voice = event[3];
	if (voice < 0 || voice >= port->chset.max_channels)
		return;

	chan = &port->chset.channels[voice];

	p1 = *(unsigned short *) &event[4];
	plong = *(int*) &event[4];

	switch (cmd) {
	case _GUS_VOICESAMPLE:
		chan->midi_program = p1;
		return;

	case _GUS_VOICEBALA:
		/* 0 to 15 --> 0 to 127 */
		chan->control[MIDI_CTL_MSB_PAN] = (int)p1 << 3;
		snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_PAN);
		return;

	case _GUS_VOICEVOL:
	case _GUS_VOICEVOL2:
		/* not supported yet */
		return;

	case _GUS_RAMPRANGE:
	case _GUS_RAMPRATE:
	case _GUS_RAMPMODE:
	case _GUS_RAMPON:
	case _GUS_RAMPOFF:
		/* volume ramping not supported */
		return;

	case _GUS_VOLUME_SCALE:
		return;

	case _GUS_VOICE_POS:
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
		snd_emux_send_effect(port, chan, EMUX_FX_SAMPLE_START,
				     (short)(plong & 0x7fff),
				     EMUX_FX_FLAG_SET);
		snd_emux_send_effect(port, chan, EMUX_FX_COARSE_SAMPLE_START,
				     (plong >> 15) & 0xffff,
				     EMUX_FX_FLAG_SET);
#endif
		return;
	}
}


/*
 * send an event to midi emulation
 */
static void
fake_event(struct snd_emux *emu, struct snd_emux_port *port, int ch, int param, int val, int atomic, int hop)
{
	struct snd_seq_event ev;
	memset(&ev, 0, sizeof(ev));
	ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
	ev.data.control.channel = ch;
	ev.data.control.param = param;
	ev.data.control.value = val;
	snd_emux_event_input(&ev, 0, port, atomic, hop);
}