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Linux/sound/core/seq/seq_midi.c

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  1 /*
  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@perex.cz>
  5  *
  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.
 10  *
 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.
 15  *
 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
 19  *
 20  */
 21  
 22 /* 
 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)
 26 */
 27 
 28 
 29 #include <linux/init.h>
 30 #include <linux/slab.h>
 31 #include <linux/errno.h>
 32 #include <linux/string.h>
 33 #include <linux/module.h>
 34 #include <linux/mutex.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>
 41 
 42 MODULE_AUTHOR("Frank van de Pol <fvdpol@coil.demon.nl>, Jaroslav Kysela <perex@perex.cz>");
 43 MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI synth.");
 44 MODULE_LICENSE("GPL");
 45 static int output_buffer_size = PAGE_SIZE;
 46 module_param(output_buffer_size, int, 0644);
 47 MODULE_PARM_DESC(output_buffer_size, "Output buffer size in bytes.");
 48 static int input_buffer_size = PAGE_SIZE;
 49 module_param(input_buffer_size, int, 0644);
 50 MODULE_PARM_DESC(input_buffer_size, "Input buffer size in bytes.");
 51 
 52 /* data for this midi synth driver */
 53 struct seq_midisynth {
 54         struct snd_card *card;
 55         int device;
 56         int subdevice;
 57         struct snd_rawmidi_file input_rfile;
 58         struct snd_rawmidi_file output_rfile;
 59         int seq_client;
 60         int seq_port;
 61         struct snd_midi_event *parser;
 62 };
 63 
 64 struct seq_midisynth_client {
 65         int seq_client;
 66         int num_ports;
 67         int ports_per_device[SNDRV_RAWMIDI_DEVICES];
 68         struct seq_midisynth *ports[SNDRV_RAWMIDI_DEVICES];
 69 };
 70 
 71 static struct seq_midisynth_client *synths[SNDRV_CARDS];
 72 static DEFINE_MUTEX(register_mutex);
 73 
 74 /* handle rawmidi input event (MIDI v1.0 stream) */
 75 static void snd_midi_input_event(struct snd_rawmidi_substream *substream)
 76 {
 77         struct snd_rawmidi_runtime *runtime;
 78         struct seq_midisynth *msynth;
 79         struct snd_seq_event ev;
 80         char buf[16], *pbuf;
 81         long res, count;
 82 
 83         if (substream == NULL)
 84                 return;
 85         runtime = substream->runtime;
 86         msynth = runtime->private_data;
 87         if (msynth == NULL)
 88                 return;
 89         memset(&ev, 0, sizeof(ev));
 90         while (runtime->avail > 0) {
 91                 res = snd_rawmidi_kernel_read(substream, buf, sizeof(buf));
 92                 if (res <= 0)
 93                         continue;
 94                 if (msynth->parser == NULL)
 95                         continue;
 96                 pbuf = buf;
 97                 while (res > 0) {
 98                         count = snd_midi_event_encode(msynth->parser, pbuf, res, &ev);
 99                         if (count < 0)
100                                 break;
101                         pbuf += count;
102                         res -= count;
103                         if (ev.type != SNDRV_SEQ_EVENT_NONE) {
104                                 ev.source.port = msynth->seq_port;
105                                 ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
106                                 snd_seq_kernel_client_dispatch(msynth->seq_client, &ev, 1, 0);
107                                 /* clear event and reset header */
108                                 memset(&ev, 0, sizeof(ev));
109                         }
110                 }
111         }
112 }
113 
114 static int dump_midi(struct snd_rawmidi_substream *substream, const char *buf, int count)
115 {
116         struct snd_rawmidi_runtime *runtime;
117         int tmp;
118 
119         if (snd_BUG_ON(!substream || !buf))
120                 return -EINVAL;
121         runtime = substream->runtime;
122         if ((tmp = runtime->avail) < count) {
123                 if (printk_ratelimit())
124                         snd_printk(KERN_ERR "MIDI output buffer overrun\n");
125                 return -ENOMEM;
126         }
127         if (snd_rawmidi_kernel_write(substream, buf, count) < count)
128                 return -EINVAL;
129         return 0;
130 }
131 
132 static int event_process_midi(struct snd_seq_event *ev, int direct,
133                               void *private_data, int atomic, int hop)
134 {
135         struct seq_midisynth *msynth = private_data;
136         unsigned char msg[10];  /* buffer for constructing midi messages */
137         struct snd_rawmidi_substream *substream;
138         int len;
139 
140         if (snd_BUG_ON(!msynth))
141                 return -EINVAL;
142         substream = msynth->output_rfile.output;
143         if (substream == NULL)
144                 return -ENODEV;
145         if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {        /* special case, to save space */
146                 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
147                         /* invalid event */
148                         snd_printd("seq_midi: invalid sysex event flags = 0x%x\n", ev->flags);
149                         return 0;
150                 }
151                 snd_seq_dump_var_event(ev, (snd_seq_dump_func_t)dump_midi, substream);
152                 snd_midi_event_reset_decode(msynth->parser);
153         } else {
154                 if (msynth->parser == NULL)
155                         return -EIO;
156                 len = snd_midi_event_decode(msynth->parser, msg, sizeof(msg), ev);
157                 if (len < 0)
158                         return 0;
159                 if (dump_midi(substream, msg, len) < 0)
160                         snd_midi_event_reset_decode(msynth->parser);
161         }
162         return 0;
163 }
164 
165 
166 static int snd_seq_midisynth_new(struct seq_midisynth *msynth,
167                                  struct snd_card *card,
168                                  int device,
169                                  int subdevice)
170 {
171         if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &msynth->parser) < 0)
172                 return -ENOMEM;
173         msynth->card = card;
174         msynth->device = device;
175         msynth->subdevice = subdevice;
176         return 0;
177 }
178 
179 /* open associated midi device for input */
180 static int midisynth_subscribe(void *private_data, struct snd_seq_port_subscribe *info)
181 {
182         int err;
183         struct seq_midisynth *msynth = private_data;
184         struct snd_rawmidi_runtime *runtime;
185         struct snd_rawmidi_params params;
186 
187         /* open midi port */
188         if ((err = snd_rawmidi_kernel_open(msynth->card, msynth->device,
189                                            msynth->subdevice,
190                                            SNDRV_RAWMIDI_LFLG_INPUT,
191                                            &msynth->input_rfile)) < 0) {
192                 snd_printd("midi input open failed!!!\n");
193                 return err;
194         }
195         runtime = msynth->input_rfile.input->runtime;
196         memset(&params, 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, &params)) < 0) {
200                 snd_rawmidi_kernel_release(&msynth->input_rfile);
201                 return err;
202         }
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);
207         return 0;
208 }
209 
210 /* close associated midi device for input */
211 static int midisynth_unsubscribe(void *private_data, struct snd_seq_port_subscribe *info)
212 {
213         int err;
214         struct seq_midisynth *msynth = private_data;
215 
216         if (snd_BUG_ON(!msynth->input_rfile.input))
217                 return -EINVAL;
218         err = snd_rawmidi_kernel_release(&msynth->input_rfile);
219         return err;
220 }
221 
222 /* open associated midi device for output */
223 static int midisynth_use(void *private_data, struct snd_seq_port_subscribe *info)
224 {
225         int err;
226         struct seq_midisynth *msynth = private_data;
227         struct snd_rawmidi_params params;
228 
229         /* open midi port */
230         if ((err = snd_rawmidi_kernel_open(msynth->card, msynth->device,
231                                            msynth->subdevice,
232                                            SNDRV_RAWMIDI_LFLG_OUTPUT,
233                                            &msynth->output_rfile)) < 0) {
234                 snd_printd("midi output open failed!!!\n");
235                 return err;
236         }
237         memset(&params, 0, sizeof(params));
238         params.avail_min = 1;
239         params.buffer_size = output_buffer_size;
240         params.no_active_sensing = 1;
241         if ((err = snd_rawmidi_output_params(msynth->output_rfile.output, &params)) < 0) {
242                 snd_rawmidi_kernel_release(&msynth->output_rfile);
243                 return err;
244         }
245         snd_midi_event_reset_decode(msynth->parser);
246         return 0;
247 }
248 
249 /* close associated midi device for output */
250 static int midisynth_unuse(void *private_data, struct snd_seq_port_subscribe *info)
251 {
252         struct seq_midisynth *msynth = private_data;
253 
254         if (snd_BUG_ON(!msynth->output_rfile.output))
255                 return -EINVAL;
256         snd_rawmidi_drain_output(msynth->output_rfile.output);
257         return snd_rawmidi_kernel_release(&msynth->output_rfile);
258 }
259 
260 /* delete given midi synth port */
261 static void snd_seq_midisynth_delete(struct seq_midisynth *msynth)
262 {
263         if (msynth == NULL)
264                 return;
265 
266         if (msynth->seq_client > 0) {
267                 /* delete port */
268                 snd_seq_event_port_detach(msynth->seq_client, msynth->seq_port);
269         }
270 
271         if (msynth->parser)
272                 snd_midi_event_free(msynth->parser);
273 }
274 
275 /* register new midi synth port */
276 static int
277 snd_seq_midisynth_register_port(struct snd_seq_device *dev)
278 {
279         struct seq_midisynth_client *client;
280         struct seq_midisynth *msynth, *ms;
281         struct snd_seq_port_info *port;
282         struct snd_rawmidi_info *info;
283         struct snd_rawmidi *rmidi = dev->private_data;
284         int newclient = 0;
285         unsigned int p, ports;
286         struct snd_seq_port_callback pcallbacks;
287         struct snd_card *card = dev->card;
288         int device = dev->device;
289         unsigned int input_count = 0, output_count = 0;
290 
291         if (snd_BUG_ON(!card || device < 0 || device >= SNDRV_RAWMIDI_DEVICES))
292                 return -EINVAL;
293         info = kmalloc(sizeof(*info), GFP_KERNEL);
294         if (! info)
295                 return -ENOMEM;
296         info->device = device;
297         info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
298         info->subdevice = 0;
299         if (snd_rawmidi_info_select(card, info) >= 0)
300                 output_count = info->subdevices_count;
301         info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
302         if (snd_rawmidi_info_select(card, info) >= 0) {
303                 input_count = info->subdevices_count;
304         }
305         ports = output_count;
306         if (ports < input_count)
307                 ports = input_count;
308         if (ports == 0) {
309                 kfree(info);
310                 return -ENODEV;
311         }
312         if (ports > (256 / SNDRV_RAWMIDI_DEVICES))
313                 ports = 256 / SNDRV_RAWMIDI_DEVICES;
314 
315         mutex_lock(&register_mutex);
316         client = synths[card->number];
317         if (client == NULL) {
318                 newclient = 1;
319                 client = kzalloc(sizeof(*client), GFP_KERNEL);
320                 if (client == NULL) {
321                         mutex_unlock(&register_mutex);
322                         kfree(info);
323                         return -ENOMEM;
324                 }
325                 client->seq_client =
326                         snd_seq_create_kernel_client(
327                                 card, 0, "%s", card->shortname[0] ?
328                                 (const char *)card->shortname : "External MIDI");
329                 if (client->seq_client < 0) {
330                         kfree(client);
331                         mutex_unlock(&register_mutex);
332                         kfree(info);
333                         return -ENOMEM;
334                 }
335         }
336 
337         msynth = kcalloc(ports, sizeof(struct seq_midisynth), GFP_KERNEL);
338         port = kmalloc(sizeof(*port), GFP_KERNEL);
339         if (msynth == NULL || port == NULL)
340                 goto __nomem;
341 
342         for (p = 0; p < ports; p++) {
343                 ms = &msynth[p];
344 
345                 if (snd_seq_midisynth_new(ms, card, device, p) < 0)
346                         goto __nomem;
347 
348                 /* declare port */
349                 memset(port, 0, sizeof(*port));
350                 port->addr.client = client->seq_client;
351                 port->addr.port = device * (256 / SNDRV_RAWMIDI_DEVICES) + p;
352                 port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT;
353                 memset(info, 0, sizeof(*info));
354                 info->device = device;
355                 if (p < output_count)
356                         info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
357                 else
358                         info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
359                 info->subdevice = p;
360                 if (snd_rawmidi_info_select(card, info) >= 0)
361                         strcpy(port->name, info->subname);
362                 if (! port->name[0]) {
363                         if (info->name[0]) {
364                                 if (ports > 1)
365                                         snprintf(port->name, sizeof(port->name), "%s-%d", info->name, p);
366                                 else
367                                         snprintf(port->name, sizeof(port->name), "%s", info->name);
368                         } else {
369                                 /* last resort */
370                                 if (ports > 1)
371                                         sprintf(port->name, "MIDI %d-%d-%d", card->number, device, p);
372                                 else
373                                         sprintf(port->name, "MIDI %d-%d", card->number, device);
374                         }
375                 }
376                 if ((info->flags & SNDRV_RAWMIDI_INFO_OUTPUT) && p < output_count)
377                         port->capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SYNC_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
378                 if ((info->flags & SNDRV_RAWMIDI_INFO_INPUT) && p < input_count)
379                         port->capability |= SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SYNC_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ;
380                 if ((port->capability & (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ)) == (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ) &&
381                     info->flags & SNDRV_RAWMIDI_INFO_DUPLEX)
382                         port->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
383                 port->type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC
384                         | SNDRV_SEQ_PORT_TYPE_HARDWARE
385                         | SNDRV_SEQ_PORT_TYPE_PORT;
386                 port->midi_channels = 16;
387                 memset(&pcallbacks, 0, sizeof(pcallbacks));
388                 pcallbacks.owner = THIS_MODULE;
389                 pcallbacks.private_data = ms;
390                 pcallbacks.subscribe = midisynth_subscribe;
391                 pcallbacks.unsubscribe = midisynth_unsubscribe;
392                 pcallbacks.use = midisynth_use;
393                 pcallbacks.unuse = midisynth_unuse;
394                 pcallbacks.event_input = event_process_midi;
395                 port->kernel = &pcallbacks;
396                 if (rmidi->ops && rmidi->ops->get_port_info)
397                         rmidi->ops->get_port_info(rmidi, p, port);
398                 if (snd_seq_kernel_client_ctl(client->seq_client, SNDRV_SEQ_IOCTL_CREATE_PORT, port)<0)
399                         goto __nomem;
400                 ms->seq_client = client->seq_client;
401                 ms->seq_port = port->addr.port;
402         }
403         client->ports_per_device[device] = ports;
404         client->ports[device] = msynth;
405         client->num_ports++;
406         if (newclient)
407                 synths[card->number] = client;
408         mutex_unlock(&register_mutex);
409         kfree(info);
410         kfree(port);
411         return 0;       /* success */
412 
413       __nomem:
414         if (msynth != NULL) {
415                 for (p = 0; p < ports; p++)
416                         snd_seq_midisynth_delete(&msynth[p]);
417                 kfree(msynth);
418         }
419         if (newclient) {
420                 snd_seq_delete_kernel_client(client->seq_client);
421                 kfree(client);
422         }
423         kfree(info);
424         kfree(port);
425         mutex_unlock(&register_mutex);
426         return -ENOMEM;
427 }
428 
429 /* release midi synth port */
430 static int
431 snd_seq_midisynth_unregister_port(struct snd_seq_device *dev)
432 {
433         struct seq_midisynth_client *client;
434         struct seq_midisynth *msynth;
435         struct snd_card *card = dev->card;
436         int device = dev->device, p, ports;
437         
438         mutex_lock(&register_mutex);
439         client = synths[card->number];
440         if (client == NULL || client->ports[device] == NULL) {
441                 mutex_unlock(&register_mutex);
442                 return -ENODEV;
443         }
444         ports = client->ports_per_device[device];
445         client->ports_per_device[device] = 0;
446         msynth = client->ports[device];
447         client->ports[device] = NULL;
448         for (p = 0; p < ports; p++)
449                 snd_seq_midisynth_delete(&msynth[p]);
450         kfree(msynth);
451         client->num_ports--;
452         if (client->num_ports <= 0) {
453                 snd_seq_delete_kernel_client(client->seq_client);
454                 synths[card->number] = NULL;
455                 kfree(client);
456         }
457         mutex_unlock(&register_mutex);
458         return 0;
459 }
460 
461 
462 static int __init alsa_seq_midi_init(void)
463 {
464         static struct snd_seq_dev_ops ops = {
465                 snd_seq_midisynth_register_port,
466                 snd_seq_midisynth_unregister_port,
467         };
468         memset(&synths, 0, sizeof(synths));
469         snd_seq_autoload_lock();
470         snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_MIDISYNTH, &ops, 0);
471         snd_seq_autoload_unlock();
472         return 0;
473 }
474 
475 static void __exit alsa_seq_midi_exit(void)
476 {
477         snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_MIDISYNTH);
478 }
479 
480 module_init(alsa_seq_midi_init)
481 module_exit(alsa_seq_midi_exit)
482 

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