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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/*
23Possible 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
42MODULE_AUTHOR("Frank van de Pol <fvdpol@coil.demon.nl>, Jaroslav Kysela <perex@perex.cz>");
43MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI synth.");
44MODULE_LICENSE("GPL");
45static int output_buffer_size = PAGE_SIZE;
46module_param(output_buffer_size, int, 0644);
47MODULE_PARM_DESC(output_buffer_size, "Output buffer size in bytes.");
48static int input_buffer_size = PAGE_SIZE;
49module_param(input_buffer_size, int, 0644);
50MODULE_PARM_DESC(input_buffer_size, "Input buffer size in bytes.");
51
52/* data for this midi synth driver */
53struct 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
64struct 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
71static struct seq_midisynth_client *synths[SNDRV_CARDS];
72static DEFINE_MUTEX(register_mutex);
73
74/* handle rawmidi input event (MIDI v1.0 stream) */
75static 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
114static 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 pr_err("ALSA: seq_midi: 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
132static 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 pr_debug("ALSA: 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
166static 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 */
180static 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 pr_debug("ALSA: seq_midi: midi input open failed!!!\n");
193 return err;
194 }
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);
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 */
211static 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 */
223static 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 pr_debug("ALSA: seq_midi: midi output open failed!!!\n");
235 return err;
236 }
237 memset(¶ms, 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, ¶ms)) < 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 */
250static 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 */
261static 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 snd_midi_event_free(msynth->parser);
272}
273
274/* register new midi synth port */
275static int
276snd_seq_midisynth_probe(struct device *_dev)
277{
278 struct snd_seq_device *dev = to_seq_dev(_dev);
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(®ister_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(®ister_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(®ister_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-%u", 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-%u", 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(®ister_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(®ister_mutex);
426 return -ENOMEM;
427}
428
429/* release midi synth port */
430static int
431snd_seq_midisynth_remove(struct device *_dev)
432{
433 struct snd_seq_device *dev = to_seq_dev(_dev);
434 struct seq_midisynth_client *client;
435 struct seq_midisynth *msynth;
436 struct snd_card *card = dev->card;
437 int device = dev->device, p, ports;
438
439 mutex_lock(®ister_mutex);
440 client = synths[card->number];
441 if (client == NULL || client->ports[device] == NULL) {
442 mutex_unlock(®ister_mutex);
443 return -ENODEV;
444 }
445 ports = client->ports_per_device[device];
446 client->ports_per_device[device] = 0;
447 msynth = client->ports[device];
448 client->ports[device] = NULL;
449 for (p = 0; p < ports; p++)
450 snd_seq_midisynth_delete(&msynth[p]);
451 kfree(msynth);
452 client->num_ports--;
453 if (client->num_ports <= 0) {
454 snd_seq_delete_kernel_client(client->seq_client);
455 synths[card->number] = NULL;
456 kfree(client);
457 }
458 mutex_unlock(®ister_mutex);
459 return 0;
460}
461
462static struct snd_seq_driver seq_midisynth_driver = {
463 .driver = {
464 .name = KBUILD_MODNAME,
465 .probe = snd_seq_midisynth_probe,
466 .remove = snd_seq_midisynth_remove,
467 },
468 .id = SNDRV_SEQ_DEV_ID_MIDISYNTH,
469 .argsize = 0,
470};
471
472module_snd_seq_driver(seq_midisynth_driver);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Generic MIDI synth driver for ALSA sequencer
4 * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
5 * Jaroslav Kysela <perex@perex.cz>
6 */
7
8/*
9Possible options for midisynth module:
10 - automatic opening of midi ports on first received event or subscription
11 (close will be performed when client leaves)
12*/
13
14
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/errno.h>
18#include <linux/string.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <sound/core.h>
22#include <sound/rawmidi.h>
23#include <sound/seq_kernel.h>
24#include <sound/seq_device.h>
25#include <sound/seq_midi_event.h>
26#include <sound/initval.h>
27
28MODULE_AUTHOR("Frank van de Pol <fvdpol@coil.demon.nl>, Jaroslav Kysela <perex@perex.cz>");
29MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI synth.");
30MODULE_LICENSE("GPL");
31static int output_buffer_size = PAGE_SIZE;
32module_param(output_buffer_size, int, 0644);
33MODULE_PARM_DESC(output_buffer_size, "Output buffer size in bytes.");
34static int input_buffer_size = PAGE_SIZE;
35module_param(input_buffer_size, int, 0644);
36MODULE_PARM_DESC(input_buffer_size, "Input buffer size in bytes.");
37
38/* data for this midi synth driver */
39struct seq_midisynth {
40 struct snd_card *card;
41 struct snd_rawmidi *rmidi;
42 int device;
43 int subdevice;
44 struct snd_rawmidi_file input_rfile;
45 struct snd_rawmidi_file output_rfile;
46 int seq_client;
47 int seq_port;
48 struct snd_midi_event *parser;
49};
50
51struct seq_midisynth_client {
52 int seq_client;
53 int num_ports;
54 int ports_per_device[SNDRV_RAWMIDI_DEVICES];
55 struct seq_midisynth *ports[SNDRV_RAWMIDI_DEVICES];
56};
57
58static struct seq_midisynth_client *synths[SNDRV_CARDS];
59static DEFINE_MUTEX(register_mutex);
60
61/* handle rawmidi input event (MIDI v1.0 stream) */
62static void snd_midi_input_event(struct snd_rawmidi_substream *substream)
63{
64 struct snd_rawmidi_runtime *runtime;
65 struct seq_midisynth *msynth;
66 struct snd_seq_event ev;
67 char buf[16], *pbuf;
68 long res;
69
70 if (substream == NULL)
71 return;
72 runtime = substream->runtime;
73 msynth = runtime->private_data;
74 if (msynth == NULL)
75 return;
76 memset(&ev, 0, sizeof(ev));
77 while (runtime->avail > 0) {
78 res = snd_rawmidi_kernel_read(substream, buf, sizeof(buf));
79 if (res <= 0)
80 continue;
81 if (msynth->parser == NULL)
82 continue;
83 pbuf = buf;
84 while (res-- > 0) {
85 if (!snd_midi_event_encode_byte(msynth->parser,
86 *pbuf++, &ev))
87 continue;
88 ev.source.port = msynth->seq_port;
89 ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
90 snd_seq_kernel_client_dispatch(msynth->seq_client, &ev, 1, 0);
91 /* clear event and reset header */
92 memset(&ev, 0, sizeof(ev));
93 }
94 }
95}
96
97static int dump_midi(struct snd_rawmidi_substream *substream, const char *buf, int count)
98{
99 struct snd_rawmidi_runtime *runtime;
100 int tmp;
101
102 if (snd_BUG_ON(!substream || !buf))
103 return -EINVAL;
104 runtime = substream->runtime;
105 tmp = runtime->avail;
106 if (tmp < count) {
107 if (printk_ratelimit())
108 pr_err("ALSA: seq_midi: MIDI output buffer overrun\n");
109 return -ENOMEM;
110 }
111 if (snd_rawmidi_kernel_write(substream, buf, count) < count)
112 return -EINVAL;
113 return 0;
114}
115
116static int event_process_midi(struct snd_seq_event *ev, int direct,
117 void *private_data, int atomic, int hop)
118{
119 struct seq_midisynth *msynth = private_data;
120 unsigned char msg[10]; /* buffer for constructing midi messages */
121 struct snd_rawmidi_substream *substream;
122 int len;
123
124 if (snd_BUG_ON(!msynth))
125 return -EINVAL;
126 substream = msynth->output_rfile.output;
127 if (substream == NULL)
128 return -ENODEV;
129 if (ev->type == SNDRV_SEQ_EVENT_SYSEX) { /* special case, to save space */
130 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
131 /* invalid event */
132 pr_debug("ALSA: seq_midi: invalid sysex event flags = 0x%x\n", ev->flags);
133 return 0;
134 }
135 snd_seq_dump_var_event(ev, (snd_seq_dump_func_t)dump_midi, substream);
136 snd_midi_event_reset_decode(msynth->parser);
137 } else {
138 if (msynth->parser == NULL)
139 return -EIO;
140 len = snd_midi_event_decode(msynth->parser, msg, sizeof(msg), ev);
141 if (len < 0)
142 return 0;
143 if (dump_midi(substream, msg, len) < 0)
144 snd_midi_event_reset_decode(msynth->parser);
145 }
146 return 0;
147}
148
149
150static int snd_seq_midisynth_new(struct seq_midisynth *msynth,
151 struct snd_card *card,
152 int device,
153 int subdevice)
154{
155 if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &msynth->parser) < 0)
156 return -ENOMEM;
157 msynth->card = card;
158 msynth->device = device;
159 msynth->subdevice = subdevice;
160 return 0;
161}
162
163/* open associated midi device for input */
164static int midisynth_subscribe(void *private_data, struct snd_seq_port_subscribe *info)
165{
166 int err;
167 struct seq_midisynth *msynth = private_data;
168 struct snd_rawmidi_runtime *runtime;
169 struct snd_rawmidi_params params;
170
171 /* open midi port */
172 err = snd_rawmidi_kernel_open(msynth->rmidi, msynth->subdevice,
173 SNDRV_RAWMIDI_LFLG_INPUT,
174 &msynth->input_rfile);
175 if (err < 0) {
176 pr_debug("ALSA: seq_midi: midi input open failed!!!\n");
177 return err;
178 }
179 runtime = msynth->input_rfile.input->runtime;
180 memset(¶ms, 0, sizeof(params));
181 params.avail_min = 1;
182 params.buffer_size = input_buffer_size;
183 err = snd_rawmidi_input_params(msynth->input_rfile.input, ¶ms);
184 if (err < 0) {
185 snd_rawmidi_kernel_release(&msynth->input_rfile);
186 return err;
187 }
188 snd_midi_event_reset_encode(msynth->parser);
189 runtime->event = snd_midi_input_event;
190 runtime->private_data = msynth;
191 snd_rawmidi_kernel_read(msynth->input_rfile.input, NULL, 0);
192 return 0;
193}
194
195/* close associated midi device for input */
196static int midisynth_unsubscribe(void *private_data, struct snd_seq_port_subscribe *info)
197{
198 int err;
199 struct seq_midisynth *msynth = private_data;
200
201 if (snd_BUG_ON(!msynth->input_rfile.input))
202 return -EINVAL;
203 err = snd_rawmidi_kernel_release(&msynth->input_rfile);
204 return err;
205}
206
207/* open associated midi device for output */
208static int midisynth_use(void *private_data, struct snd_seq_port_subscribe *info)
209{
210 int err;
211 struct seq_midisynth *msynth = private_data;
212 struct snd_rawmidi_params params;
213
214 /* open midi port */
215 err = snd_rawmidi_kernel_open(msynth->rmidi, msynth->subdevice,
216 SNDRV_RAWMIDI_LFLG_OUTPUT,
217 &msynth->output_rfile);
218 if (err < 0) {
219 pr_debug("ALSA: seq_midi: midi output open failed!!!\n");
220 return err;
221 }
222 memset(¶ms, 0, sizeof(params));
223 params.avail_min = 1;
224 params.buffer_size = output_buffer_size;
225 params.no_active_sensing = 1;
226 err = snd_rawmidi_output_params(msynth->output_rfile.output, ¶ms);
227 if (err < 0) {
228 snd_rawmidi_kernel_release(&msynth->output_rfile);
229 return err;
230 }
231 snd_midi_event_reset_decode(msynth->parser);
232 return 0;
233}
234
235/* close associated midi device for output */
236static int midisynth_unuse(void *private_data, struct snd_seq_port_subscribe *info)
237{
238 struct seq_midisynth *msynth = private_data;
239
240 if (snd_BUG_ON(!msynth->output_rfile.output))
241 return -EINVAL;
242 snd_rawmidi_drain_output(msynth->output_rfile.output);
243 return snd_rawmidi_kernel_release(&msynth->output_rfile);
244}
245
246/* delete given midi synth port */
247static void snd_seq_midisynth_delete(struct seq_midisynth *msynth)
248{
249 if (msynth == NULL)
250 return;
251
252 if (msynth->seq_client > 0) {
253 /* delete port */
254 snd_seq_event_port_detach(msynth->seq_client, msynth->seq_port);
255 }
256
257 snd_midi_event_free(msynth->parser);
258}
259
260/* register new midi synth port */
261static int
262snd_seq_midisynth_probe(struct device *_dev)
263{
264 struct snd_seq_device *dev = to_seq_dev(_dev);
265 struct seq_midisynth_client *client;
266 struct seq_midisynth *msynth, *ms;
267 struct snd_seq_port_info *port;
268 struct snd_rawmidi_info *info;
269 struct snd_rawmidi *rmidi = dev->private_data;
270 int newclient = 0;
271 unsigned int p, ports;
272 struct snd_seq_port_callback pcallbacks;
273 struct snd_card *card = dev->card;
274 int device = dev->device;
275 unsigned int input_count = 0, output_count = 0;
276
277 if (snd_BUG_ON(!card || device < 0 || device >= SNDRV_RAWMIDI_DEVICES))
278 return -EINVAL;
279 info = kmalloc(sizeof(*info), GFP_KERNEL);
280 if (! info)
281 return -ENOMEM;
282 info->device = device;
283 info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
284 info->subdevice = 0;
285 if (snd_rawmidi_info_select(card, info) >= 0)
286 output_count = info->subdevices_count;
287 info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
288 if (snd_rawmidi_info_select(card, info) >= 0) {
289 input_count = info->subdevices_count;
290 }
291 ports = output_count;
292 if (ports < input_count)
293 ports = input_count;
294 if (ports == 0) {
295 kfree(info);
296 return -ENODEV;
297 }
298 if (ports > (256 / SNDRV_RAWMIDI_DEVICES))
299 ports = 256 / SNDRV_RAWMIDI_DEVICES;
300
301 mutex_lock(®ister_mutex);
302 client = synths[card->number];
303 if (client == NULL) {
304 newclient = 1;
305 client = kzalloc(sizeof(*client), GFP_KERNEL);
306 if (client == NULL) {
307 mutex_unlock(®ister_mutex);
308 kfree(info);
309 return -ENOMEM;
310 }
311 client->seq_client =
312 snd_seq_create_kernel_client(
313 card, 0, "%s", card->shortname[0] ?
314 (const char *)card->shortname : "External MIDI");
315 if (client->seq_client < 0) {
316 kfree(client);
317 mutex_unlock(®ister_mutex);
318 kfree(info);
319 return -ENOMEM;
320 }
321 }
322
323 msynth = kcalloc(ports, sizeof(struct seq_midisynth), GFP_KERNEL);
324 port = kmalloc(sizeof(*port), GFP_KERNEL);
325 if (msynth == NULL || port == NULL)
326 goto __nomem;
327
328 for (p = 0; p < ports; p++) {
329 ms = &msynth[p];
330 ms->rmidi = rmidi;
331
332 if (snd_seq_midisynth_new(ms, card, device, p) < 0)
333 goto __nomem;
334
335 /* declare port */
336 memset(port, 0, sizeof(*port));
337 port->addr.client = client->seq_client;
338 port->addr.port = device * (256 / SNDRV_RAWMIDI_DEVICES) + p;
339 port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT;
340 memset(info, 0, sizeof(*info));
341 info->device = device;
342 if (p < output_count)
343 info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
344 else
345 info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
346 info->subdevice = p;
347 if (snd_rawmidi_info_select(card, info) >= 0)
348 strcpy(port->name, info->subname);
349 if (! port->name[0]) {
350 if (info->name[0]) {
351 if (ports > 1)
352 scnprintf(port->name, sizeof(port->name), "%s-%u", info->name, p);
353 else
354 scnprintf(port->name, sizeof(port->name), "%s", info->name);
355 } else {
356 /* last resort */
357 if (ports > 1)
358 sprintf(port->name, "MIDI %d-%d-%u", card->number, device, p);
359 else
360 sprintf(port->name, "MIDI %d-%d", card->number, device);
361 }
362 }
363 if ((info->flags & SNDRV_RAWMIDI_INFO_OUTPUT) && p < output_count)
364 port->capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SYNC_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
365 if ((info->flags & SNDRV_RAWMIDI_INFO_INPUT) && p < input_count)
366 port->capability |= SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SYNC_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ;
367 if ((port->capability & (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ)) == (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ) &&
368 info->flags & SNDRV_RAWMIDI_INFO_DUPLEX)
369 port->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
370 if (port->capability & SNDRV_SEQ_PORT_CAP_READ)
371 port->direction |= SNDRV_SEQ_PORT_DIR_INPUT;
372 if (port->capability & SNDRV_SEQ_PORT_CAP_WRITE)
373 port->direction |= SNDRV_SEQ_PORT_DIR_OUTPUT;
374 port->type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC
375 | SNDRV_SEQ_PORT_TYPE_HARDWARE
376 | SNDRV_SEQ_PORT_TYPE_PORT;
377 port->midi_channels = 16;
378 memset(&pcallbacks, 0, sizeof(pcallbacks));
379 pcallbacks.owner = THIS_MODULE;
380 pcallbacks.private_data = ms;
381 pcallbacks.subscribe = midisynth_subscribe;
382 pcallbacks.unsubscribe = midisynth_unsubscribe;
383 pcallbacks.use = midisynth_use;
384 pcallbacks.unuse = midisynth_unuse;
385 pcallbacks.event_input = event_process_midi;
386 port->kernel = &pcallbacks;
387 if (rmidi->ops && rmidi->ops->get_port_info)
388 rmidi->ops->get_port_info(rmidi, p, port);
389 if (snd_seq_kernel_client_ctl(client->seq_client, SNDRV_SEQ_IOCTL_CREATE_PORT, port)<0)
390 goto __nomem;
391 ms->seq_client = client->seq_client;
392 ms->seq_port = port->addr.port;
393 }
394 client->ports_per_device[device] = ports;
395 client->ports[device] = msynth;
396 client->num_ports++;
397 if (newclient)
398 synths[card->number] = client;
399 mutex_unlock(®ister_mutex);
400 kfree(info);
401 kfree(port);
402 return 0; /* success */
403
404 __nomem:
405 if (msynth != NULL) {
406 for (p = 0; p < ports; p++)
407 snd_seq_midisynth_delete(&msynth[p]);
408 kfree(msynth);
409 }
410 if (newclient) {
411 snd_seq_delete_kernel_client(client->seq_client);
412 kfree(client);
413 }
414 kfree(info);
415 kfree(port);
416 mutex_unlock(®ister_mutex);
417 return -ENOMEM;
418}
419
420/* release midi synth port */
421static int
422snd_seq_midisynth_remove(struct device *_dev)
423{
424 struct snd_seq_device *dev = to_seq_dev(_dev);
425 struct seq_midisynth_client *client;
426 struct seq_midisynth *msynth;
427 struct snd_card *card = dev->card;
428 int device = dev->device, p, ports;
429
430 mutex_lock(®ister_mutex);
431 client = synths[card->number];
432 if (client == NULL || client->ports[device] == NULL) {
433 mutex_unlock(®ister_mutex);
434 return -ENODEV;
435 }
436 ports = client->ports_per_device[device];
437 client->ports_per_device[device] = 0;
438 msynth = client->ports[device];
439 client->ports[device] = NULL;
440 for (p = 0; p < ports; p++)
441 snd_seq_midisynth_delete(&msynth[p]);
442 kfree(msynth);
443 client->num_ports--;
444 if (client->num_ports <= 0) {
445 snd_seq_delete_kernel_client(client->seq_client);
446 synths[card->number] = NULL;
447 kfree(client);
448 }
449 mutex_unlock(®ister_mutex);
450 return 0;
451}
452
453static struct snd_seq_driver seq_midisynth_driver = {
454 .driver = {
455 .name = KBUILD_MODNAME,
456 .probe = snd_seq_midisynth_probe,
457 .remove = snd_seq_midisynth_remove,
458 },
459 .id = SNDRV_SEQ_DEV_ID_MIDISYNTH,
460 .argsize = 0,
461};
462
463module_snd_seq_driver(seq_midisynth_driver);