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