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 <asm/semaphore.h>
35 #include <sound/core.h>
36 #include <sound/rawmidi.h>
37 #include <sound/seq_kernel.h>
38 #include <sound/seq_device.h>
39 #include <sound/seq_midi_event.h>
40 #include <sound/initval.h>
42 MODULE_AUTHOR("Frank van de Pol <fvdpol@coil.demon.nl>, Jaroslav Kysela <perex@suse.cz>");
43 MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI synth.");
44 MODULE_LICENSE("GPL");
45 MODULE_CLASSES("{sound}");
46 MODULE_SUPPORTED_DEVICE("sound");
47 int output_buffer_size = PAGE_SIZE;
48 MODULE_PARM(output_buffer_size, "i");
49 MODULE_PARM_DESC(output_buffer_size, "Output buffer size in bytes.");
50 int input_buffer_size = PAGE_SIZE;
51 MODULE_PARM(input_buffer_size, "i");
52 MODULE_PARM_DESC(input_buffer_size, "Input buffer size in bytes.");
54 /* data for this midi synth driver */
59 snd_rawmidi_file_t input_rfile;
60 snd_rawmidi_file_t output_rfile;
63 snd_midi_event_t *parser;
69 int ports_per_device[SNDRV_RAWMIDI_DEVICES];
70 seq_midisynth_t *ports[SNDRV_RAWMIDI_DEVICES];
71 } seq_midisynth_client_t;
73 static seq_midisynth_client_t *synths[SNDRV_CARDS];
74 static DECLARE_MUTEX(register_mutex);
76 /* handle rawmidi input event (MIDI v1.0 stream) */
77 static void snd_midi_input_event(snd_rawmidi_substream_t * substream)
79 snd_rawmidi_runtime_t *runtime;
80 seq_midisynth_t *msynth;
85 if (substream == NULL)
87 runtime = substream->runtime;
88 msynth = (seq_midisynth_t *) runtime->private_data;
91 memset(&ev, 0, sizeof(ev));
92 while (runtime->avail > 0) {
93 res = snd_rawmidi_kernel_read(substream, buf, sizeof(buf));
96 if (msynth->parser == NULL)
100 count = snd_midi_event_encode(msynth->parser, pbuf, res, &ev);
105 if (ev.type != SNDRV_SEQ_EVENT_NONE) {
106 ev.source.port = msynth->seq_port;
107 ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
108 snd_seq_kernel_client_dispatch(msynth->seq_client, &ev, 1, 0);
109 /* clear event and reset header */
110 memset(&ev, 0, sizeof(ev));
116 static int dump_midi(snd_rawmidi_substream_t *substream, const char *buf, int count)
118 snd_rawmidi_runtime_t *runtime;
121 snd_assert(substream != NULL || buf != NULL, return -EINVAL);
122 runtime = substream->runtime;
123 if ((tmp = runtime->avail) < count) {
124 snd_printd("warning, output event was lost (count = %i, available = %i)\n", count, tmp);
127 if (snd_rawmidi_kernel_write(substream, buf, count) < count)
132 static int event_process_midi(snd_seq_event_t * ev, int direct,
133 void *private_data, int atomic, int hop)
135 seq_midisynth_t *msynth = (seq_midisynth_t *) private_data;
136 unsigned char msg[10]; /* buffer for constructing midi messages */
137 snd_rawmidi_substream_t *substream;
140 snd_assert(msynth != NULL, return -EINVAL);
141 substream = msynth->output_rfile.output;
142 if (substream == NULL)
144 if (ev->type == SNDRV_SEQ_EVENT_SYSEX) { /* special case, to save space */
145 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
147 snd_printd("seq_midi: invalid sysex event flags = 0x%x\n", ev->flags);
150 res = snd_seq_dump_var_event(ev, (snd_seq_dump_func_t)dump_midi, substream);
151 snd_midi_event_reset_decode(msynth->parser);
155 if (msynth->parser == NULL)
157 res = snd_midi_event_decode(msynth->parser, msg, sizeof(msg), ev);
160 if ((res = dump_midi(substream, msg, res)) < 0) {
161 snd_midi_event_reset_decode(msynth->parser);
169 static int snd_seq_midisynth_new(seq_midisynth_t *msynth,
174 if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &msynth->parser) < 0)
177 msynth->device = device;
178 msynth->subdevice = subdevice;
182 /* open associated midi device for input */
183 static int midisynth_subscribe(void *private_data, snd_seq_port_subscribe_t *info)
186 seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
187 snd_rawmidi_runtime_t *runtime;
188 snd_rawmidi_params_t params;
191 if ((err = snd_rawmidi_kernel_open(msynth->card->number, msynth->device, msynth->subdevice, SNDRV_RAWMIDI_LFLG_INPUT, &msynth->input_rfile)) < 0) {
192 snd_printd("midi input open failed!!!\n");
195 runtime = msynth->input_rfile.input->runtime;
196 memset(¶ms, 0, sizeof(params));
197 params.avail_min = 1;
198 params.buffer_size = input_buffer_size;
199 if ((err = snd_rawmidi_input_params(msynth->input_rfile.input, ¶ms)) < 0) {
200 snd_rawmidi_kernel_release(&msynth->input_rfile);
203 snd_midi_event_reset_encode(msynth->parser);
204 runtime->event = snd_midi_input_event;
205 runtime->private_data = msynth;
206 snd_rawmidi_kernel_read(msynth->input_rfile.input, NULL, 0);
210 /* close associated midi device for input */
211 static int midisynth_unsubscribe(void *private_data, snd_seq_port_subscribe_t *info)
214 seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
216 snd_assert(msynth->input_rfile.input != NULL, return -EINVAL);
217 err = snd_rawmidi_kernel_release(&msynth->input_rfile);
221 /* open associated midi device for output */
222 static int midisynth_use(void *private_data, snd_seq_port_subscribe_t *info)
225 seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
226 snd_rawmidi_params_t params;
229 if ((err = snd_rawmidi_kernel_open(msynth->card->number, msynth->device, msynth->subdevice, SNDRV_RAWMIDI_LFLG_OUTPUT, &msynth->output_rfile)) < 0) {
230 snd_printd("midi output open failed!!!\n");
233 memset(¶ms, 0, sizeof(params));
234 params.avail_min = 1;
235 params.buffer_size = output_buffer_size;
236 if ((err = snd_rawmidi_output_params(msynth->output_rfile.output, ¶ms)) < 0) {
237 snd_rawmidi_kernel_release(&msynth->output_rfile);
240 snd_midi_event_reset_decode(msynth->parser);
244 /* close associated midi device for output */
245 static int midisynth_unuse(void *private_data, snd_seq_port_subscribe_t *info)
247 seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
248 unsigned char buf = 0xff; /* MIDI reset */
250 snd_assert(msynth->output_rfile.output != NULL, return -EINVAL);
251 /* sending single MIDI reset message to shut the device up */
252 snd_rawmidi_kernel_write(msynth->output_rfile.output, &buf, 1);
253 snd_rawmidi_drain_output(msynth->output_rfile.output);
254 return snd_rawmidi_kernel_release(&msynth->output_rfile);
257 /* delete given midi synth port */
258 static void snd_seq_midisynth_delete(seq_midisynth_t *msynth)
263 if (msynth->seq_client > 0) {
265 snd_seq_event_port_detach(msynth->seq_client, msynth->seq_port);
269 snd_midi_event_free(msynth->parser);
272 /* set our client name */
273 static int set_client_name(seq_midisynth_client_t *client, snd_card_t *card,
274 snd_rawmidi_info_t *rmidi)
276 snd_seq_client_info_t cinfo;
279 memset(&cinfo, 0, sizeof(cinfo));
280 cinfo.client = client->seq_client;
281 cinfo.type = KERNEL_CLIENT;
282 name = rmidi->name[0] ? (const char *)rmidi->name : "External MIDI";
283 snprintf(cinfo.name, sizeof(cinfo.name), "%s - Rawmidi %d", name, card->number);
284 return snd_seq_kernel_client_ctl(client->seq_client, SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, &cinfo);
287 /* register new midi synth port */
289 snd_seq_midisynth_register_port(snd_seq_device_t *dev)
291 seq_midisynth_client_t *client;
292 seq_midisynth_t *msynth, *ms;
293 snd_seq_port_info_t port;
294 snd_rawmidi_info_t info;
296 unsigned int p, ports;
297 snd_seq_client_callback_t callbacks;
298 snd_seq_port_callback_t pcallbacks;
299 snd_card_t *card = dev->card;
300 int device = dev->device;
301 unsigned int input_count = 0, output_count = 0;
303 snd_assert(card != NULL && device >= 0 && device < SNDRV_RAWMIDI_DEVICES, return -EINVAL);
304 info.device = device;
305 info.stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
307 if (snd_rawmidi_info_select(card, &info) >= 0)
308 output_count = info.subdevices_count;
309 info.stream = SNDRV_RAWMIDI_STREAM_INPUT;
310 if (snd_rawmidi_info_select(card, &info) >= 0) {
311 input_count = info.subdevices_count;
313 ports = output_count;
314 if (ports < input_count)
318 if (ports > (256 / SNDRV_RAWMIDI_DEVICES))
319 ports = 256 / SNDRV_RAWMIDI_DEVICES;
321 down(®ister_mutex);
322 client = synths[card->number];
323 if (client == NULL) {
325 client = snd_kcalloc(sizeof(seq_midisynth_client_t), GFP_KERNEL);
326 if (client == NULL) {
330 memset(&callbacks, 0, sizeof(callbacks));
331 callbacks.private_data = client;
332 callbacks.allow_input = callbacks.allow_output = 1;
333 client->seq_client = snd_seq_create_kernel_client(card, 0, &callbacks);
334 if (client->seq_client < 0) {
339 set_client_name(client, card, &info);
340 } else if (device == 0)
341 set_client_name(client, card, &info); /* use the first device's name */
343 msynth = snd_kcalloc(sizeof(seq_midisynth_t) * ports, GFP_KERNEL);
347 for (p = 0; p < ports; p++) {
350 if (snd_seq_midisynth_new(ms, card, device, p) < 0)
354 memset(&port, 0, sizeof(port));
355 port.addr.client = client->seq_client;
356 port.addr.port = device * (256 / SNDRV_RAWMIDI_DEVICES) + p;
357 port.flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT;
358 memset(&info, 0, sizeof(info));
359 info.device = device;
360 if (p < output_count)
361 info.stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
363 info.stream = SNDRV_RAWMIDI_STREAM_INPUT;
365 if (snd_rawmidi_info_select(card, &info) >= 0)
366 strcpy(port.name, info.subname);
367 if (! port.name[0]) {
370 snprintf(port.name, sizeof(port.name), "%s-%d", info.name, p);
372 snprintf(port.name, sizeof(port.name), "%s", info.name);
376 sprintf(port.name, "MIDI %d-%d-%d", card->number, device, p);
378 sprintf(port.name, "MIDI %d-%d", card->number, device);
381 if ((info.flags & SNDRV_RAWMIDI_INFO_OUTPUT) && p < output_count)
382 port.capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SYNC_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
383 if ((info.flags & SNDRV_RAWMIDI_INFO_INPUT) && p < input_count)
384 port.capability |= SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SYNC_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ;
385 if ((port.capability & (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ)) == (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ) &&
386 info.flags & SNDRV_RAWMIDI_INFO_DUPLEX)
387 port.capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
388 port.type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC;
389 port.midi_channels = 16;
390 memset(&pcallbacks, 0, sizeof(pcallbacks));
391 pcallbacks.owner = THIS_MODULE;
392 pcallbacks.private_data = ms;
393 pcallbacks.subscribe = midisynth_subscribe;
394 pcallbacks.unsubscribe = midisynth_unsubscribe;
395 pcallbacks.use = midisynth_use;
396 pcallbacks.unuse = midisynth_unuse;
397 pcallbacks.event_input = event_process_midi;
398 port.kernel = &pcallbacks;
399 if (snd_seq_kernel_client_ctl(client->seq_client, SNDRV_SEQ_IOCTL_CREATE_PORT, &port)<0)
401 ms->seq_client = client->seq_client;
402 ms->seq_port = port.addr.port;
404 client->ports_per_device[device] = ports;
405 client->ports[device] = msynth;
408 synths[card->number] = client;
410 return 0; /* success */
413 if (msynth != NULL) {
414 for (p = 0; p < ports; p++)
415 snd_seq_midisynth_delete(&msynth[p]);
419 snd_seq_delete_kernel_client(client->seq_client);
426 /* release midi synth port */
428 snd_seq_midisynth_unregister_port(snd_seq_device_t *dev)
430 seq_midisynth_client_t *client;
431 seq_midisynth_t *msynth;
432 snd_card_t *card = dev->card;
433 int device = dev->device, p, ports;
435 down(®ister_mutex);
436 client = synths[card->number];
437 if (client == NULL || client->ports[device] == NULL) {
441 ports = client->ports_per_device[device];
442 client->ports_per_device[device] = 0;
443 msynth = client->ports[device];
444 client->ports[device] = NULL;
445 snd_runtime_check(msynth != NULL || ports <= 0, goto __skip);
446 for (p = 0; p < ports; p++)
447 snd_seq_midisynth_delete(&msynth[p]);
451 if (client->num_ports <= 0) {
452 snd_seq_delete_kernel_client(client->seq_client);
453 synths[card->number] = NULL;
461 static int __init alsa_seq_midi_init(void)
463 static snd_seq_dev_ops_t ops = {
464 snd_seq_midisynth_register_port,
465 snd_seq_midisynth_unregister_port,
467 memset(&synths, 0, sizeof(synths));
468 snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_MIDISYNTH, &ops, 0);
472 static void __exit alsa_seq_midi_exit(void)
474 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_MIDISYNTH);
477 module_init(alsa_seq_midi_init)
478 module_exit(alsa_seq_midi_exit)