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38#include <linux/init.h>
39#include <linux/wait.h>
40#include <linux/module.h>
41#include <linux/slab.h>
42#include <sound/core.h>
43#include <sound/rawmidi.h>
44#include <sound/info.h>
45#include <sound/control.h>
46#include <sound/minors.h>
47#include <sound/seq_kernel.h>
48#include <sound/seq_midi_event.h>
49#include <sound/seq_virmidi.h>
50
51MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
52MODULE_DESCRIPTION("Virtual Raw MIDI client on Sequencer");
53MODULE_LICENSE("GPL");
54
55
56
57
58static void snd_virmidi_init_event(struct snd_virmidi *vmidi,
59 struct snd_seq_event *ev)
60{
61 memset(ev, 0, sizeof(*ev));
62 ev->source.port = vmidi->port;
63 switch (vmidi->seq_mode) {
64 case SNDRV_VIRMIDI_SEQ_DISPATCH:
65 ev->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
66 break;
67 case SNDRV_VIRMIDI_SEQ_ATTACH:
68
69 ev->dest.client = vmidi->client;
70 ev->dest.port = vmidi->port;
71 break;
72 }
73 ev->type = SNDRV_SEQ_EVENT_NONE;
74}
75
76
77
78
79static int snd_virmidi_dev_receive_event(struct snd_virmidi_dev *rdev,
80 struct snd_seq_event *ev)
81{
82 struct snd_virmidi *vmidi;
83 unsigned char msg[4];
84 int len;
85
86 read_lock(&rdev->filelist_lock);
87 list_for_each_entry(vmidi, &rdev->filelist, list) {
88 if (!vmidi->trigger)
89 continue;
90 if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
91 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
92 continue;
93 snd_seq_dump_var_event(ev, (snd_seq_dump_func_t)snd_rawmidi_receive, vmidi->substream);
94 } else {
95 len = snd_midi_event_decode(vmidi->parser, msg, sizeof(msg), ev);
96 if (len > 0)
97 snd_rawmidi_receive(vmidi->substream, msg, len);
98 }
99 }
100 read_unlock(&rdev->filelist_lock);
101
102 return 0;
103}
104
105
106
107
108
109
110
111
112#if 0
113int snd_virmidi_receive(struct snd_rawmidi *rmidi, struct snd_seq_event *ev)
114{
115 struct snd_virmidi_dev *rdev;
116
117 rdev = rmidi->private_data;
118 return snd_virmidi_dev_receive_event(rdev, ev);
119}
120#endif
121
122
123
124
125static int snd_virmidi_event_input(struct snd_seq_event *ev, int direct,
126 void *private_data, int atomic, int hop)
127{
128 struct snd_virmidi_dev *rdev;
129
130 rdev = private_data;
131 if (!(rdev->flags & SNDRV_VIRMIDI_USE))
132 return 0;
133 return snd_virmidi_dev_receive_event(rdev, ev);
134}
135
136
137
138
139static void snd_virmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
140{
141 struct snd_virmidi *vmidi = substream->runtime->private_data;
142
143 if (up) {
144 vmidi->trigger = 1;
145 } else {
146 vmidi->trigger = 0;
147 }
148}
149
150
151
152
153static void snd_virmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
154{
155 struct snd_virmidi *vmidi = substream->runtime->private_data;
156 int count, res;
157 unsigned char buf[32], *pbuf;
158
159 if (up) {
160 vmidi->trigger = 1;
161 if (vmidi->seq_mode == SNDRV_VIRMIDI_SEQ_DISPATCH &&
162 !(vmidi->rdev->flags & SNDRV_VIRMIDI_SUBSCRIBE)) {
163 snd_rawmidi_transmit_ack(substream, substream->runtime->buffer_size - substream->runtime->avail);
164 return;
165 }
166 if (vmidi->event.type != SNDRV_SEQ_EVENT_NONE) {
167 if (snd_seq_kernel_client_dispatch(vmidi->client, &vmidi->event, in_atomic(), 0) < 0)
168 return;
169 vmidi->event.type = SNDRV_SEQ_EVENT_NONE;
170 }
171 while (1) {
172 count = snd_rawmidi_transmit_peek(substream, buf, sizeof(buf));
173 if (count <= 0)
174 break;
175 pbuf = buf;
176 while (count > 0) {
177 res = snd_midi_event_encode(vmidi->parser, pbuf, count, &vmidi->event);
178 if (res < 0) {
179 snd_midi_event_reset_encode(vmidi->parser);
180 continue;
181 }
182 snd_rawmidi_transmit_ack(substream, res);
183 pbuf += res;
184 count -= res;
185 if (vmidi->event.type != SNDRV_SEQ_EVENT_NONE) {
186 if (snd_seq_kernel_client_dispatch(vmidi->client, &vmidi->event, in_atomic(), 0) < 0)
187 return;
188 vmidi->event.type = SNDRV_SEQ_EVENT_NONE;
189 }
190 }
191 }
192 } else {
193 vmidi->trigger = 0;
194 }
195}
196
197
198
199
200static int snd_virmidi_input_open(struct snd_rawmidi_substream *substream)
201{
202 struct snd_virmidi_dev *rdev = substream->rmidi->private_data;
203 struct snd_rawmidi_runtime *runtime = substream->runtime;
204 struct snd_virmidi *vmidi;
205 unsigned long flags;
206
207 vmidi = kzalloc(sizeof(*vmidi), GFP_KERNEL);
208 if (vmidi == NULL)
209 return -ENOMEM;
210 vmidi->substream = substream;
211 if (snd_midi_event_new(0, &vmidi->parser) < 0) {
212 kfree(vmidi);
213 return -ENOMEM;
214 }
215 vmidi->seq_mode = rdev->seq_mode;
216 vmidi->client = rdev->client;
217 vmidi->port = rdev->port;
218 runtime->private_data = vmidi;
219 write_lock_irqsave(&rdev->filelist_lock, flags);
220 list_add_tail(&vmidi->list, &rdev->filelist);
221 write_unlock_irqrestore(&rdev->filelist_lock, flags);
222 vmidi->rdev = rdev;
223 return 0;
224}
225
226
227
228
229static int snd_virmidi_output_open(struct snd_rawmidi_substream *substream)
230{
231 struct snd_virmidi_dev *rdev = substream->rmidi->private_data;
232 struct snd_rawmidi_runtime *runtime = substream->runtime;
233 struct snd_virmidi *vmidi;
234
235 vmidi = kzalloc(sizeof(*vmidi), GFP_KERNEL);
236 if (vmidi == NULL)
237 return -ENOMEM;
238 vmidi->substream = substream;
239 if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &vmidi->parser) < 0) {
240 kfree(vmidi);
241 return -ENOMEM;
242 }
243 vmidi->seq_mode = rdev->seq_mode;
244 vmidi->client = rdev->client;
245 vmidi->port = rdev->port;
246 snd_virmidi_init_event(vmidi, &vmidi->event);
247 vmidi->rdev = rdev;
248 runtime->private_data = vmidi;
249 return 0;
250}
251
252
253
254
255static int snd_virmidi_input_close(struct snd_rawmidi_substream *substream)
256{
257 struct snd_virmidi *vmidi = substream->runtime->private_data;
258 snd_midi_event_free(vmidi->parser);
259 list_del(&vmidi->list);
260 substream->runtime->private_data = NULL;
261 kfree(vmidi);
262 return 0;
263}
264
265
266
267
268static int snd_virmidi_output_close(struct snd_rawmidi_substream *substream)
269{
270 struct snd_virmidi *vmidi = substream->runtime->private_data;
271 snd_midi_event_free(vmidi->parser);
272 substream->runtime->private_data = NULL;
273 kfree(vmidi);
274 return 0;
275}
276
277
278
279
280static int snd_virmidi_subscribe(void *private_data,
281 struct snd_seq_port_subscribe *info)
282{
283 struct snd_virmidi_dev *rdev;
284
285 rdev = private_data;
286 if (!try_module_get(rdev->card->module))
287 return -EFAULT;
288 rdev->flags |= SNDRV_VIRMIDI_SUBSCRIBE;
289 return 0;
290}
291
292
293
294
295static int snd_virmidi_unsubscribe(void *private_data,
296 struct snd_seq_port_subscribe *info)
297{
298 struct snd_virmidi_dev *rdev;
299
300 rdev = private_data;
301 rdev->flags &= ~SNDRV_VIRMIDI_SUBSCRIBE;
302 module_put(rdev->card->module);
303 return 0;
304}
305
306
307
308
309
310static int snd_virmidi_use(void *private_data,
311 struct snd_seq_port_subscribe *info)
312{
313 struct snd_virmidi_dev *rdev;
314
315 rdev = private_data;
316 if (!try_module_get(rdev->card->module))
317 return -EFAULT;
318 rdev->flags |= SNDRV_VIRMIDI_USE;
319 return 0;
320}
321
322
323
324
325static int snd_virmidi_unuse(void *private_data,
326 struct snd_seq_port_subscribe *info)
327{
328 struct snd_virmidi_dev *rdev;
329
330 rdev = private_data;
331 rdev->flags &= ~SNDRV_VIRMIDI_USE;
332 module_put(rdev->card->module);
333 return 0;
334}
335
336
337
338
339
340
341static struct snd_rawmidi_ops snd_virmidi_input_ops = {
342 .open = snd_virmidi_input_open,
343 .close = snd_virmidi_input_close,
344 .trigger = snd_virmidi_input_trigger,
345};
346
347static struct snd_rawmidi_ops snd_virmidi_output_ops = {
348 .open = snd_virmidi_output_open,
349 .close = snd_virmidi_output_close,
350 .trigger = snd_virmidi_output_trigger,
351};
352
353
354
355
356static int snd_virmidi_dev_attach_seq(struct snd_virmidi_dev *rdev)
357{
358 int client;
359 struct snd_seq_port_callback pcallbacks;
360 struct snd_seq_port_info *pinfo;
361 int err;
362
363 if (rdev->client >= 0)
364 return 0;
365
366 pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
367 if (!pinfo) {
368 err = -ENOMEM;
369 goto __error;
370 }
371
372 client = snd_seq_create_kernel_client(rdev->card, rdev->device,
373 "%s %d-%d", rdev->rmidi->name,
374 rdev->card->number,
375 rdev->device);
376 if (client < 0) {
377 err = client;
378 goto __error;
379 }
380 rdev->client = client;
381
382
383 pinfo->addr.client = client;
384 sprintf(pinfo->name, "VirMIDI %d-%d", rdev->card->number, rdev->device);
385
386 pinfo->capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SYNC_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
387 pinfo->capability |= SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SYNC_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ;
388 pinfo->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
389 pinfo->type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC
390 | SNDRV_SEQ_PORT_TYPE_SOFTWARE
391 | SNDRV_SEQ_PORT_TYPE_PORT;
392 pinfo->midi_channels = 16;
393 memset(&pcallbacks, 0, sizeof(pcallbacks));
394 pcallbacks.owner = THIS_MODULE;
395 pcallbacks.private_data = rdev;
396 pcallbacks.subscribe = snd_virmidi_subscribe;
397 pcallbacks.unsubscribe = snd_virmidi_unsubscribe;
398 pcallbacks.use = snd_virmidi_use;
399 pcallbacks.unuse = snd_virmidi_unuse;
400 pcallbacks.event_input = snd_virmidi_event_input;
401 pinfo->kernel = &pcallbacks;
402 err = snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_CREATE_PORT, pinfo);
403 if (err < 0) {
404 snd_seq_delete_kernel_client(client);
405 rdev->client = -1;
406 goto __error;
407 }
408
409 rdev->port = pinfo->addr.port;
410 err = 0;
411
412 __error:
413 kfree(pinfo);
414 return err;
415}
416
417
418
419
420
421static void snd_virmidi_dev_detach_seq(struct snd_virmidi_dev *rdev)
422{
423 if (rdev->client >= 0) {
424 snd_seq_delete_kernel_client(rdev->client);
425 rdev->client = -1;
426 }
427}
428
429
430
431
432static int snd_virmidi_dev_register(struct snd_rawmidi *rmidi)
433{
434 struct snd_virmidi_dev *rdev = rmidi->private_data;
435 int err;
436
437 switch (rdev->seq_mode) {
438 case SNDRV_VIRMIDI_SEQ_DISPATCH:
439 err = snd_virmidi_dev_attach_seq(rdev);
440 if (err < 0)
441 return err;
442 break;
443 case SNDRV_VIRMIDI_SEQ_ATTACH:
444 if (rdev->client == 0)
445 return -EINVAL;
446
447 break;
448 default:
449 snd_printk(KERN_ERR "seq_mode is not set: %d\n", rdev->seq_mode);
450 return -EINVAL;
451 }
452 return 0;
453}
454
455
456
457
458
459static int snd_virmidi_dev_unregister(struct snd_rawmidi *rmidi)
460{
461 struct snd_virmidi_dev *rdev = rmidi->private_data;
462
463 if (rdev->seq_mode == SNDRV_VIRMIDI_SEQ_DISPATCH)
464 snd_virmidi_dev_detach_seq(rdev);
465 return 0;
466}
467
468
469
470
471static struct snd_rawmidi_global_ops snd_virmidi_global_ops = {
472 .dev_register = snd_virmidi_dev_register,
473 .dev_unregister = snd_virmidi_dev_unregister,
474};
475
476
477
478
479static void snd_virmidi_free(struct snd_rawmidi *rmidi)
480{
481 struct snd_virmidi_dev *rdev = rmidi->private_data;
482 kfree(rdev);
483}
484
485
486
487
488
489
490int snd_virmidi_new(struct snd_card *card, int device, struct snd_rawmidi **rrmidi)
491{
492 struct snd_rawmidi *rmidi;
493 struct snd_virmidi_dev *rdev;
494 int err;
495
496 *rrmidi = NULL;
497 if ((err = snd_rawmidi_new(card, "VirMidi", device,
498 16,
499 16,
500 &rmidi)) < 0)
501 return err;
502 strcpy(rmidi->name, rmidi->id);
503 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
504 if (rdev == NULL) {
505 snd_device_free(card, rmidi);
506 return -ENOMEM;
507 }
508 rdev->card = card;
509 rdev->rmidi = rmidi;
510 rdev->device = device;
511 rdev->client = -1;
512 rwlock_init(&rdev->filelist_lock);
513 INIT_LIST_HEAD(&rdev->filelist);
514 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH;
515 rmidi->private_data = rdev;
516 rmidi->private_free = snd_virmidi_free;
517 rmidi->ops = &snd_virmidi_global_ops;
518 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_virmidi_input_ops);
519 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_virmidi_output_ops);
520 rmidi->info_flags = SNDRV_RAWMIDI_INFO_INPUT |
521 SNDRV_RAWMIDI_INFO_OUTPUT |
522 SNDRV_RAWMIDI_INFO_DUPLEX;
523 *rrmidi = rmidi;
524 return 0;
525}
526
527
528
529
530
531static int __init alsa_virmidi_init(void)
532{
533 return 0;
534}
535
536static void __exit alsa_virmidi_exit(void)
537{
538}
539
540module_init(alsa_virmidi_init)
541module_exit(alsa_virmidi_exit)
542
543EXPORT_SYMBOL(snd_virmidi_new);
544