summaryrefslogtreecommitdiff
path: root/sound/synth/emux/emux_seq.c
blob: 396c406d0f779e2d776524a8f9792fd9efafa14e (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
/*
 *  Midi Sequencer interface routines.
 *
 *  Copyright (C) 1999 Steve Ratcliffe
 *  Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include "emux_voice.h"
#include <linux/slab.h>
#include <linux/module.h>

/* Prototypes for static functions */
static void free_port(void *private);
static void snd_emux_init_port(struct snd_emux_port *p);
static int snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info);
static int snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info);

/*
 * MIDI emulation operators
 */
static struct snd_midi_op emux_ops = {
	.note_on = snd_emux_note_on,
	.note_off = snd_emux_note_off,
	.key_press = snd_emux_key_press,
	.note_terminate = snd_emux_terminate_note,
	.control = snd_emux_control,
	.nrpn = snd_emux_nrpn,
	.sysex = snd_emux_sysex,
};


/*
 * number of MIDI channels
 */
#define MIDI_CHANNELS		16

/*
 * type flags for MIDI sequencer port
 */
#define DEFAULT_MIDI_TYPE	(SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\
				 SNDRV_SEQ_PORT_TYPE_MIDI_GM |\
				 SNDRV_SEQ_PORT_TYPE_MIDI_GS |\
				 SNDRV_SEQ_PORT_TYPE_MIDI_XG |\
				 SNDRV_SEQ_PORT_TYPE_HARDWARE |\
				 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)

/*
 * Initialise the EMUX Synth by creating a client and registering
 * a series of ports.
 * Each of the ports will contain the 16 midi channels.  Applications
 * can connect to these ports to play midi data.
 */
int
snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index)
{
	int  i;
	struct snd_seq_port_callback pinfo;
	char tmpname[64];

	emu->client = snd_seq_create_kernel_client(card, index,
						   "%s WaveTable", emu->name);
	if (emu->client < 0) {
		snd_printk(KERN_ERR "can't create client\n");
		return -ENODEV;
	}

	if (emu->num_ports < 0) {
		snd_printk(KERN_WARNING "seqports must be greater than zero\n");
		emu->num_ports = 1;
	} else if (emu->num_ports >= SNDRV_EMUX_MAX_PORTS) {
		snd_printk(KERN_WARNING "too many ports."
			   "limited max. ports %d\n", SNDRV_EMUX_MAX_PORTS);
		emu->num_ports = SNDRV_EMUX_MAX_PORTS;
	}

	memset(&pinfo, 0, sizeof(pinfo));
	pinfo.owner = THIS_MODULE;
	pinfo.use = snd_emux_use;
	pinfo.unuse = snd_emux_unuse;
	pinfo.event_input = snd_emux_event_input;

	for (i = 0; i < emu->num_ports; i++) {
		struct snd_emux_port *p;

		sprintf(tmpname, "%s Port %d", emu->name, i);
		p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS,
					 0, &pinfo);
		if (!p) {
			snd_printk(KERN_ERR "can't create port\n");
			return -ENOMEM;
		}

		p->port_mode =  SNDRV_EMUX_PORT_MODE_MIDI;
		snd_emux_init_port(p);
		emu->ports[i] = p->chset.port;
		emu->portptrs[i] = p;
	}

	return 0;
}


/*
 * Detach from the ports that were set up for this synthesizer and
 * destroy the kernel client.
 */
void
snd_emux_detach_seq(struct snd_emux *emu)
{
	if (emu->voices)
		snd_emux_terminate_all(emu);
		
	if (emu->client >= 0) {
		snd_seq_delete_kernel_client(emu->client);
		emu->client = -1;
	}
}


/*
 * create a sequencer port and channel_set
 */

struct snd_emux_port *
snd_emux_create_port(struct snd_emux *emu, char *name,
		     int max_channels, int oss_port,
		     struct snd_seq_port_callback *callback)
{
	struct snd_emux_port *p;
	int i, type, cap;

	/* Allocate structures for this channel */
	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return NULL;

	p->chset.channels = kcalloc(max_channels, sizeof(*p->chset.channels),
				    GFP_KERNEL);
	if (!p->chset.channels) {
		kfree(p);
		return NULL;
	}
	for (i = 0; i < max_channels; i++)
		p->chset.channels[i].number = i;
	p->chset.private_data = p;
	p->chset.max_channels = max_channels;
	p->emu = emu;
	p->chset.client = emu->client;
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	snd_emux_create_effect(p);
#endif
	callback->private_free = free_port;
	callback->private_data = p;

	cap = SNDRV_SEQ_PORT_CAP_WRITE;
	if (oss_port) {
		type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
	} else {
		type = DEFAULT_MIDI_TYPE;
		cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
	}

	p->chset.port = snd_seq_event_port_attach(emu->client, callback,
						  cap, type, max_channels,
						  emu->max_voices, name);

	return p;
}


/*
 * release memory block for port
 */
static void
free_port(void *private_data)
{
	struct snd_emux_port *p;

	p = private_data;
	if (p) {
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
		snd_emux_delete_effect(p);
#endif
		kfree(p->chset.channels);
		kfree(p);
	}
}


#define DEFAULT_DRUM_FLAGS	(1<<9)

/*
 * initialize the port specific parameters
 */
static void
snd_emux_init_port(struct snd_emux_port *p)
{
	p->drum_flags = DEFAULT_DRUM_FLAGS;
	p->volume_atten = 0;

	snd_emux_reset_port(p);
}


/*
 * reset port
 */
void
snd_emux_reset_port(struct snd_emux_port *port)
{
	int i;

	/* stop all sounds */
	snd_emux_sounds_off_all(port);

	snd_midi_channel_set_clear(&port->chset);

#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	snd_emux_clear_effect(port);
#endif

	/* set port specific control parameters */
	port->ctrls[EMUX_MD_DEF_BANK] = 0;
	port->ctrls[EMUX_MD_DEF_DRUM] = 0;
	port->ctrls[EMUX_MD_REALTIME_PAN] = 1;

	for (i = 0; i < port->chset.max_channels; i++) {
		struct snd_midi_channel *chan = port->chset.channels + i;
		chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
	}
}


/*
 * input sequencer event
 */
int
snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data,
		     int atomic, int hop)
{
	struct snd_emux_port *port;

	port = private_data;
	if (snd_BUG_ON(!port || !ev))
		return -EINVAL;

	snd_midi_process_event(&emux_ops, ev, &port->chset);

	return 0;
}


/*
 * increment usage count
 */
static int
__snd_emux_inc_count(struct snd_emux *emu)
{
	emu->used++;
	if (!try_module_get(emu->ops.owner))
		goto __error;
	if (!try_module_get(emu->card->module)) {
		module_put(emu->ops.owner);
	      __error:
		emu->used--;
		return 0;
	}
	return 1;
}

int snd_emux_inc_count(struct snd_emux *emu)
{
	int ret;

	mutex_lock(&emu->register_mutex);
	ret = __snd_emux_inc_count(emu);
	mutex_unlock(&emu->register_mutex);
	return ret;
}

/*
 * decrease usage count
 */
static void
__snd_emux_dec_count(struct snd_emux *emu)
{
	module_put(emu->card->module);
	emu->used--;
	if (emu->used <= 0)
		snd_emux_terminate_all(emu);
	module_put(emu->ops.owner);
}

void snd_emux_dec_count(struct snd_emux *emu)
{
	mutex_lock(&emu->register_mutex);
	__snd_emux_dec_count(emu);
	mutex_unlock(&emu->register_mutex);
}

/*
 * Routine that is called upon a first use of a particular port
 */
static int
snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info)
{
	struct snd_emux_port *p;
	struct snd_emux *emu;

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

	mutex_lock(&emu->register_mutex);
	snd_emux_init_port(p);
	__snd_emux_inc_count(emu);
	mutex_unlock(&emu->register_mutex);
	return 0;
}

/*
 * Routine that is called upon the last unuse() of a particular port.
 */
static int
snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info)
{
	struct snd_emux_port *p;
	struct snd_emux *emu;

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

	mutex_lock(&emu->register_mutex);
	snd_emux_sounds_off_all(p);
	__snd_emux_dec_count(emu);
	mutex_unlock(&emu->register_mutex);
	return 0;
}


/*
 * attach virtual rawmidi devices
 */
int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card)
{
	int i;

	emu->vmidi = NULL;
	if (emu->midi_ports <= 0)
		return 0;

	emu->vmidi = kcalloc(emu->midi_ports, sizeof(*emu->vmidi), GFP_KERNEL);
	if (!emu->vmidi)
		return -ENOMEM;

	for (i = 0; i < emu->midi_ports; i++) {
		struct snd_rawmidi *rmidi;
		struct snd_virmidi_dev *rdev;
		if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
			goto __error;
		rdev = rmidi->private_data;
		sprintf(rmidi->name, "%s Synth MIDI", emu->name);
		rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
		rdev->client = emu->client;
		rdev->port = emu->ports[i];
		if (snd_device_register(card, rmidi) < 0) {
			snd_device_free(card, rmidi);
			goto __error;
		}
		emu->vmidi[i] = rmidi;
		/* snd_printk(KERN_DEBUG "virmidi %d ok\n", i); */
	}
	return 0;

__error:
	/* snd_printk(KERN_DEBUG "error init..\n"); */
	snd_emux_delete_virmidi(emu);
	return -ENOMEM;
}

int snd_emux_delete_virmidi(struct snd_emux *emu)
{
	int i;

	if (!emu->vmidi)
		return 0;

	for (i = 0; i < emu->midi_ports; i++) {
		if (emu->vmidi[i])
			snd_device_free(emu->card, emu->vmidi[i]);
	}
	kfree(emu->vmidi);
	emu->vmidi = NULL;
	return 0;
}