2 * Generic MIDI synth driver for ALSA sequencer
3 * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@suse.cz>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 Possible options for midisynth module:
24 - automatic opening of midi ports on first received event or subscription
25 (close will be performed when client leaves)
29 #include <sound/driver.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/string.h>
34 #include <linux/moduleparam.h>
35 #include <asm/semaphore.h>
36 #include <sound/core.h>
37 #include <sound/rawmidi.h>
38 #include <sound/seq_kernel.h>
39 #include <sound/seq_device.h>
40 #include <sound/seq_midi_event.h>
41 #include <sound/initval.h>
43 MODULE_AUTHOR("Frank van de Pol <fvdpol@coil.demon.nl>, Jaroslav Kysela <perex@suse.cz>");
44 MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI synth.");
45 MODULE_LICENSE("GPL");
46 static int output_buffer_size = PAGE_SIZE;
47 module_param(output_buffer_size, int, 0644);
48 MODULE_PARM_DESC(output_buffer_size, "Output buffer size in bytes.");
49 static int input_buffer_size = PAGE_SIZE;
50 module_param(input_buffer_size, int, 0644);
51 MODULE_PARM_DESC(input_buffer_size, "Input buffer size in bytes.");
53 /* data for this midi synth driver */
58 snd_rawmidi_file_t input_rfile;
59 snd_rawmidi_file_t output_rfile;
62 snd_midi_event_t *parser;
68 int ports_per_device[SNDRV_RAWMIDI_DEVICES];
69 seq_midisynth_t *ports[SNDRV_RAWMIDI_DEVICES];
70 } seq_midisynth_client_t;
72 static seq_midisynth_client_t *synths[SNDRV_CARDS];
73 static DECLARE_MUTEX(register_mutex);
75 /* handle rawmidi input event (MIDI v1.0 stream) */
76 static void snd_midi_input_event(snd_rawmidi_substream_t * substream)
78 snd_rawmidi_runtime_t *runtime;
79 seq_midisynth_t *msynth;
84 if (substream == NULL)
86 runtime = substream->runtime;
87 msynth = (seq_midisynth_t *) runtime->private_data;
90 memset(&ev, 0, sizeof(ev));
91 while (runtime->avail > 0) {
92 res = snd_rawmidi_kernel_read(substream, buf, sizeof(buf));
95 if (msynth->parser == NULL)
99 count = snd_midi_event_encode(msynth->parser, pbuf, res, &ev);
104 if (ev.type != SNDRV_SEQ_EVENT_NONE) {
105 ev.source.port = msynth->seq_port;
106 ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
107 snd_seq_kernel_client_dispatch(msynth->seq_client, &ev, 1, 0);
108 /* clear event and reset header */
109 memset(&ev, 0, sizeof(ev));
115 static int dump_midi(snd_rawmidi_substream_t *substream, const char *buf, int count)
117 snd_rawmidi_runtime_t *runtime;
120 snd_assert(substream != NULL || buf != NULL, return -EINVAL);
121 runtime = substream->runtime;
122 if ((tmp = runtime->avail) < count) {
123 snd_printd("warning, output event was lost (count = %i, available = %i)\n", count, tmp);
126 if (snd_rawmidi_kernel_write(substream, buf, count) < count)
131 static int event_process_midi(snd_seq_event_t * ev, int direct,
132 void *private_data, int atomic, int hop)
134 seq_midisynth_t *msynth = (seq_midisynth_t *) private_data;
135 unsigned char msg[10]; /* buffer for constructing midi messages */
136 snd_rawmidi_substream_t *substream;
139 snd_assert(msynth != NULL, return -EINVAL);
140 substream = msynth->output_rfile.output;
141 if (substream == NULL)
143 if (ev->type == SNDRV_SEQ_EVENT_SYSEX) { /* special case, to save space */
144 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
146 snd_printd("seq_midi: invalid sysex event flags = 0x%x\n", ev->flags);
149 res = snd_seq_dump_var_event(ev, (snd_seq_dump_func_t)dump_midi, substream);
150 snd_midi_event_reset_decode(msynth->parser);
154 if (msynth->parser == NULL)
156 res = snd_midi_event_decode(msynth->parser, msg, sizeof(msg), ev);
159 if ((res = dump_midi(substream, msg, res)) < 0) {
160 snd_midi_event_reset_decode(msynth->parser);
168 static int snd_seq_midisynth_new(seq_midisynth_t *msynth,
173 if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &msynth->parser) < 0)
176 msynth->device = device;
177 msynth->subdevice = subdevice;
181 /* open associated midi device for input */
182 static int midisynth_subscribe(void *private_data, snd_seq_port_subscribe_t *info)
185 seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
186 snd_rawmidi_runtime_t *runtime;
187 snd_rawmidi_params_t params;
190 if ((err = snd_rawmidi_kernel_open(msynth->card->number, msynth->device, msynth->subdevice, SNDRV_RAWMIDI_LFLG_INPUT, &msynth->input_rfile)) < 0) {
191 snd_printd("midi input open failed!!!\n");
194 runtime = msynth->input_rfile.input->runtime;
195 memset(¶ms, 0, sizeof(params));
196 params.avail_min = 1;
197 params.buffer_size = input_buffer_size;
198 if ((err = snd_rawmidi_input_params(msynth->input_rfile.input, ¶ms)) < 0) {
199 snd_rawmidi_kernel_release(&msynth->input_rfile);
202 snd_midi_event_reset_encode(msynth->parser);
203 runtime->event = snd_midi_input_event;
204 runtime->private_data = msynth;
205 snd_rawmidi_kernel_read(msynth->input_rfile.input, NULL, 0);
209 /* close associated midi device for input */
210 static int midisynth_unsubscribe(void *private_data, snd_seq_port_subscribe_t *info)
213 seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
215 snd_assert(msynth->input_rfile.input != NULL, return -EINVAL);
216 err = snd_rawmidi_kernel_release(&msynth->input_rfile);
220 /* open associated midi device for output */
221 static int midisynth_use(void *private_data, snd_seq_port_subscribe_t *info)
224 seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
225 snd_rawmidi_params_t params;
228 if ((err = snd_rawmidi_kernel_open(msynth->card->number, msynth->device, msynth->subdevice, SNDRV_RAWMIDI_LFLG_OUTPUT, &msynth->output_rfile)) < 0) {
229 snd_printd("midi output open failed!!!\n");
232 memset(¶ms, 0, sizeof(params));
233 params.avail_min = 1;
234 params.buffer_size = output_buffer_size;
235 if ((err = snd_rawmidi_output_params(msynth->output_rfile.output, ¶ms)) < 0) {
236 snd_rawmidi_kernel_release(&msynth->output_rfile);
239 snd_midi_event_reset_decode(msynth->parser);
243 /* close associated midi device for output */
244 static int midisynth_unuse(void *private_data, snd_seq_port_subscribe_t *info)
246 seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
247 unsigned char buf = 0xff; /* MIDI reset */
249 snd_assert(msynth->output_rfile.output != NULL, return -EINVAL);
250 /* sending single MIDI reset message to shut the device up */
251 snd_rawmidi_kernel_write(msynth->output_rfile.output, &buf, 1);
252 snd_rawmidi_drain_output(msynth->output_rfile.output);
253 return snd_rawmidi_kernel_release(&msynth->output_rfile);
256 /* delete given midi synth port */
257 static void snd_seq_midisynth_delete(seq_midisynth_t *msynth)
262 if (msynth->seq_client > 0) {
264 snd_seq_event_port_detach(msynth->seq_client, msynth->seq_port);
268 snd_midi_event_free(msynth->parser);
271 /* set our client name */
272 static int set_client_name(seq_midisynth_client_t *client, snd_card_t *card,
273 snd_rawmidi_info_t *rmidi)
275 snd_seq_client_info_t cinfo;
278 memset(&cinfo, 0, sizeof(cinfo));
279 cinfo.client = client->seq_client;
280 cinfo.type = KERNEL_CLIENT;
281 name = rmidi->name[0] ? (const char *)rmidi->name : "External MIDI";
282 strlcpy(cinfo.name, name, sizeof(cinfo.name));
283 return snd_seq_kernel_client_ctl(client->seq_client, SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, &cinfo);
286 /* register new midi synth port */
288 snd_seq_midisynth_register_port(snd_seq_device_t *dev)
290 seq_midisynth_client_t *client;
291 seq_midisynth_t *msynth, *ms;
292 snd_seq_port_info_t *port;
293 snd_rawmidi_info_t *info;
295 unsigned int p, ports;
296 snd_seq_client_callback_t callbacks;
297 snd_seq_port_callback_t pcallbacks;
298 snd_card_t *card = dev->card;
299 int device = dev->device;
300 unsigned int input_count = 0, output_count = 0;
302 snd_assert(card != NULL && device >= 0 && device < SNDRV_RAWMIDI_DEVICES, return -EINVAL);
303 info = kmalloc(sizeof(*info), GFP_KERNEL);
306 info->device = device;
307 info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
309 if (snd_rawmidi_info_select(card, info) >= 0)
310 output_count = info->subdevices_count;
311 info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
312 if (snd_rawmidi_info_select(card, info) >= 0) {
313 input_count = info->subdevices_count;
315 ports = output_count;
316 if (ports < input_count)
322 if (ports > (256 / SNDRV_RAWMIDI_DEVICES))
323 ports = 256 / SNDRV_RAWMIDI_DEVICES;
325 down(®ister_mutex);
326 client = synths[card->number];
327 if (client == NULL) {
329 client = kcalloc(1, sizeof(*client), GFP_KERNEL);
330 if (client == NULL) {
335 memset(&callbacks, 0, sizeof(callbacks));
336 callbacks.private_data = client;
337 callbacks.allow_input = callbacks.allow_output = 1;
338 client->seq_client = snd_seq_create_kernel_client(card, 0, &callbacks);
339 if (client->seq_client < 0) {
345 set_client_name(client, card, info);
346 } else if (device == 0)
347 set_client_name(client, card, info); /* use the first device's name */
349 msynth = kcalloc(ports, sizeof(seq_midisynth_t), GFP_KERNEL);
350 port = kmalloc(sizeof(*port), GFP_KERNEL);
351 if (msynth == NULL || port == NULL)
354 for (p = 0; p < ports; p++) {
357 if (snd_seq_midisynth_new(ms, card, device, p) < 0)
361 memset(port, 0, sizeof(*port));
362 port->addr.client = client->seq_client;
363 port->addr.port = device * (256 / SNDRV_RAWMIDI_DEVICES) + p;
364 port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT;
365 memset(info, 0, sizeof(*info));
366 info->device = device;
367 if (p < output_count)
368 info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
370 info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
372 if (snd_rawmidi_info_select(card, info) >= 0)
373 strcpy(port->name, info->subname);
374 if (! port->name[0]) {
377 snprintf(port->name, sizeof(port->name), "%s-%d", info->name, p);
379 snprintf(port->name, sizeof(port->name), "%s", info->name);
383 sprintf(port->name, "MIDI %d-%d-%d", card->number, device, p);
385 sprintf(port->name, "MIDI %d-%d", card->number, device);
388 if ((info->flags & SNDRV_RAWMIDI_INFO_OUTPUT) && p < output_count)
389 port->capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SYNC_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
390 if ((info->flags & SNDRV_RAWMIDI_INFO_INPUT) && p < input_count)
391 port->capability |= SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SYNC_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ;
392 if ((port->capability & (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ)) == (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ) &&
393 info->flags & SNDRV_RAWMIDI_INFO_DUPLEX)
394 port->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
395 port->type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC;
396 port->midi_channels = 16;
397 memset(&pcallbacks, 0, sizeof(pcallbacks));
398 pcallbacks.owner = THIS_MODULE;
399 pcallbacks.private_data = ms;
400 pcallbacks.subscribe = midisynth_subscribe;
401 pcallbacks.unsubscribe = midisynth_unsubscribe;
402 pcallbacks.use = midisynth_use;
403 pcallbacks.unuse = midisynth_unuse;
404 pcallbacks.event_input = event_process_midi;
405 port->kernel = &pcallbacks;
406 if (snd_seq_kernel_client_ctl(client->seq_client, SNDRV_SEQ_IOCTL_CREATE_PORT, port)<0)
408 ms->seq_client = client->seq_client;
409 ms->seq_port = port->addr.port;
411 client->ports_per_device[device] = ports;
412 client->ports[device] = msynth;
415 synths[card->number] = client;
417 return 0; /* success */
420 if (msynth != NULL) {
421 for (p = 0; p < ports; p++)
422 snd_seq_midisynth_delete(&msynth[p]);
426 snd_seq_delete_kernel_client(client->seq_client);
435 /* release midi synth port */
437 snd_seq_midisynth_unregister_port(snd_seq_device_t *dev)
439 seq_midisynth_client_t *client;
440 seq_midisynth_t *msynth;
441 snd_card_t *card = dev->card;
442 int device = dev->device, p, ports;
444 down(®ister_mutex);
445 client = synths[card->number];
446 if (client == NULL || client->ports[device] == NULL) {
450 ports = client->ports_per_device[device];
451 client->ports_per_device[device] = 0;
452 msynth = client->ports[device];
453 client->ports[device] = NULL;
454 snd_runtime_check(msynth != NULL || ports <= 0, goto __skip);
455 for (p = 0; p < ports; p++)
456 snd_seq_midisynth_delete(&msynth[p]);
460 if (client->num_ports <= 0) {
461 snd_seq_delete_kernel_client(client->seq_client);
462 synths[card->number] = NULL;
470 static int __init alsa_seq_midi_init(void)
472 static snd_seq_dev_ops_t ops = {
473 snd_seq_midisynth_register_port,
474 snd_seq_midisynth_unregister_port,
476 memset(&synths, 0, sizeof(synths));
477 snd_seq_autoload_lock();
478 snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_MIDISYNTH, &ops, 0);
479 snd_seq_autoload_unlock();
483 static void __exit alsa_seq_midi_exit(void)
485 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_MIDISYNTH);
488 module_init(alsa_seq_midi_init)
489 module_exit(alsa_seq_midi_exit)