1 /*
2 * OSS compatible sequencer driver
3 *
4 * open/close and reset interface
5 *
6 * Copyright (C) 1998-1999 Takashi Iwai <tiwai@suse.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #include "seq_oss_device.h"
24 #include "seq_oss_synth.h"
25 #include "seq_oss_midi.h"
26 #include "seq_oss_writeq.h"
27 #include "seq_oss_readq.h"
28 #include "seq_oss_timer.h"
29 #include "seq_oss_event.h"
30 #include <linux/init.h>
31 #include <linux/export.h>
32 #include <linux/moduleparam.h>
33 #include <linux/slab.h>
34
35 /*
36 * common variables
37 */
38 static int maxqlen = SNDRV_SEQ_OSS_MAX_QLEN;
39 module_param(maxqlen, int, 0444);
40 MODULE_PARM_DESC(maxqlen, "maximum queue length");
41
42 static int system_client = -1; /* ALSA sequencer client number */
43 static int system_port = -1;
44
45 static int num_clients;
46 static struct seq_oss_devinfo *client_table[SNDRV_SEQ_OSS_MAX_CLIENTS];
47
48
49 /*
50 * prototypes
51 */
52 static int receive_announce(struct snd_seq_event *ev, int direct, void *private, int atomic, int hop);
53 static int translate_mode(struct file *file);
54 static int create_port(struct seq_oss_devinfo *dp);
55 static int delete_port(struct seq_oss_devinfo *dp);
56 static int alloc_seq_queue(struct seq_oss_devinfo *dp);
57 static int delete_seq_queue(int queue);
58 static void free_devinfo(void *private);
59
60 #define call_ctl(type,rec) snd_seq_kernel_client_ctl(system_client, type, rec)
61
62
63 /*
64 * create sequencer client for OSS sequencer
65 */
66 int __init
snd_seq_oss_create_client(void)67 snd_seq_oss_create_client(void)
68 {
69 int rc;
70 struct snd_seq_port_info *port;
71 struct snd_seq_port_callback port_callback;
72
73 port = kmalloc(sizeof(*port), GFP_KERNEL);
74 if (!port) {
75 rc = -ENOMEM;
76 goto __error;
77 }
78
79 /* create ALSA client */
80 rc = snd_seq_create_kernel_client(NULL, SNDRV_SEQ_CLIENT_OSS,
81 "OSS sequencer");
82 if (rc < 0)
83 goto __error;
84
85 system_client = rc;
86 debug_printk(("new client = %d\n", rc));
87
88 /* look up midi devices */
89 snd_seq_oss_midi_lookup_ports(system_client);
90
91 /* create annoucement receiver port */
92 memset(port, 0, sizeof(*port));
93 strcpy(port->name, "Receiver");
94 port->addr.client = system_client;
95 port->capability = SNDRV_SEQ_PORT_CAP_WRITE; /* receive only */
96 port->type = 0;
97
98 memset(&port_callback, 0, sizeof(port_callback));
99 /* don't set port_callback.owner here. otherwise the module counter
100 * is incremented and we can no longer release the module..
101 */
102 port_callback.event_input = receive_announce;
103 port->kernel = &port_callback;
104
105 call_ctl(SNDRV_SEQ_IOCTL_CREATE_PORT, port);
106 if ((system_port = port->addr.port) >= 0) {
107 struct snd_seq_port_subscribe subs;
108
109 memset(&subs, 0, sizeof(subs));
110 subs.sender.client = SNDRV_SEQ_CLIENT_SYSTEM;
111 subs.sender.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
112 subs.dest.client = system_client;
113 subs.dest.port = system_port;
114 call_ctl(SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs);
115 }
116 rc = 0;
117
118 __error:
119 kfree(port);
120 return rc;
121 }
122
123
124 /*
125 * receive annoucement from system port, and check the midi device
126 */
127 static int
receive_announce(struct snd_seq_event * ev,int direct,void * private,int atomic,int hop)128 receive_announce(struct snd_seq_event *ev, int direct, void *private, int atomic, int hop)
129 {
130 struct snd_seq_port_info pinfo;
131
132 if (atomic)
133 return 0; /* it must not happen */
134
135 switch (ev->type) {
136 case SNDRV_SEQ_EVENT_PORT_START:
137 case SNDRV_SEQ_EVENT_PORT_CHANGE:
138 if (ev->data.addr.client == system_client)
139 break; /* ignore myself */
140 memset(&pinfo, 0, sizeof(pinfo));
141 pinfo.addr = ev->data.addr;
142 if (call_ctl(SNDRV_SEQ_IOCTL_GET_PORT_INFO, &pinfo) >= 0)
143 snd_seq_oss_midi_check_new_port(&pinfo);
144 break;
145
146 case SNDRV_SEQ_EVENT_PORT_EXIT:
147 if (ev->data.addr.client == system_client)
148 break; /* ignore myself */
149 snd_seq_oss_midi_check_exit_port(ev->data.addr.client,
150 ev->data.addr.port);
151 break;
152 }
153 return 0;
154 }
155
156
157 /*
158 * delete OSS sequencer client
159 */
160 int
snd_seq_oss_delete_client(void)161 snd_seq_oss_delete_client(void)
162 {
163 if (system_client >= 0)
164 snd_seq_delete_kernel_client(system_client);
165
166 snd_seq_oss_midi_clear_all();
167
168 return 0;
169 }
170
171
172 /*
173 * open sequencer device
174 */
175 int
snd_seq_oss_open(struct file * file,int level)176 snd_seq_oss_open(struct file *file, int level)
177 {
178 int i, rc;
179 struct seq_oss_devinfo *dp;
180
181 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
182 if (!dp) {
183 snd_printk(KERN_ERR "can't malloc device info\n");
184 return -ENOMEM;
185 }
186 debug_printk(("oss_open: dp = %p\n", dp));
187
188 dp->cseq = system_client;
189 dp->port = -1;
190 dp->queue = -1;
191
192 for (i = 0; i < SNDRV_SEQ_OSS_MAX_CLIENTS; i++) {
193 if (client_table[i] == NULL)
194 break;
195 }
196
197 dp->index = i;
198 if (i >= SNDRV_SEQ_OSS_MAX_CLIENTS) {
199 snd_printk(KERN_ERR "too many applications\n");
200 rc = -ENOMEM;
201 goto _error;
202 }
203
204 /* look up synth and midi devices */
205 snd_seq_oss_synth_setup(dp);
206 snd_seq_oss_midi_setup(dp);
207
208 if (dp->synth_opened == 0 && dp->max_mididev == 0) {
209 /* snd_printk(KERN_ERR "no device found\n"); */
210 rc = -ENODEV;
211 goto _error;
212 }
213
214 /* create port */
215 debug_printk(("create new port\n"));
216 rc = create_port(dp);
217 if (rc < 0) {
218 snd_printk(KERN_ERR "can't create port\n");
219 goto _error;
220 }
221
222 /* allocate queue */
223 debug_printk(("allocate queue\n"));
224 rc = alloc_seq_queue(dp);
225 if (rc < 0)
226 goto _error;
227
228 /* set address */
229 dp->addr.client = dp->cseq;
230 dp->addr.port = dp->port;
231 /*dp->addr.queue = dp->queue;*/
232 /*dp->addr.channel = 0;*/
233
234 dp->seq_mode = level;
235
236 /* set up file mode */
237 dp->file_mode = translate_mode(file);
238
239 /* initialize read queue */
240 debug_printk(("initialize read queue\n"));
241 if (is_read_mode(dp->file_mode)) {
242 dp->readq = snd_seq_oss_readq_new(dp, maxqlen);
243 if (!dp->readq) {
244 rc = -ENOMEM;
245 goto _error;
246 }
247 }
248
249 /* initialize write queue */
250 debug_printk(("initialize write queue\n"));
251 if (is_write_mode(dp->file_mode)) {
252 dp->writeq = snd_seq_oss_writeq_new(dp, maxqlen);
253 if (!dp->writeq) {
254 rc = -ENOMEM;
255 goto _error;
256 }
257 }
258
259 /* initialize timer */
260 debug_printk(("initialize timer\n"));
261 dp->timer = snd_seq_oss_timer_new(dp);
262 if (!dp->timer) {
263 snd_printk(KERN_ERR "can't alloc timer\n");
264 rc = -ENOMEM;
265 goto _error;
266 }
267 debug_printk(("timer initialized\n"));
268
269 /* set private data pointer */
270 file->private_data = dp;
271
272 /* set up for mode2 */
273 if (level == SNDRV_SEQ_OSS_MODE_MUSIC)
274 snd_seq_oss_synth_setup_midi(dp);
275 else if (is_read_mode(dp->file_mode))
276 snd_seq_oss_midi_open_all(dp, SNDRV_SEQ_OSS_FILE_READ);
277
278 client_table[dp->index] = dp;
279 num_clients++;
280
281 debug_printk(("open done\n"));
282 return 0;
283
284 _error:
285 snd_seq_oss_synth_cleanup(dp);
286 snd_seq_oss_midi_cleanup(dp);
287 delete_seq_queue(dp->queue);
288 delete_port(dp);
289
290 return rc;
291 }
292
293 /*
294 * translate file flags to private mode
295 */
296 static int
translate_mode(struct file * file)297 translate_mode(struct file *file)
298 {
299 int file_mode = 0;
300 if ((file->f_flags & O_ACCMODE) != O_RDONLY)
301 file_mode |= SNDRV_SEQ_OSS_FILE_WRITE;
302 if ((file->f_flags & O_ACCMODE) != O_WRONLY)
303 file_mode |= SNDRV_SEQ_OSS_FILE_READ;
304 if (file->f_flags & O_NONBLOCK)
305 file_mode |= SNDRV_SEQ_OSS_FILE_NONBLOCK;
306 return file_mode;
307 }
308
309
310 /*
311 * create sequencer port
312 */
313 static int
create_port(struct seq_oss_devinfo * dp)314 create_port(struct seq_oss_devinfo *dp)
315 {
316 int rc;
317 struct snd_seq_port_info port;
318 struct snd_seq_port_callback callback;
319
320 memset(&port, 0, sizeof(port));
321 port.addr.client = dp->cseq;
322 sprintf(port.name, "Sequencer-%d", dp->index);
323 port.capability = SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_WRITE; /* no subscription */
324 port.type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
325 port.midi_channels = 128;
326 port.synth_voices = 128;
327
328 memset(&callback, 0, sizeof(callback));
329 callback.owner = THIS_MODULE;
330 callback.private_data = dp;
331 callback.event_input = snd_seq_oss_event_input;
332 callback.private_free = free_devinfo;
333 port.kernel = &callback;
334
335 rc = call_ctl(SNDRV_SEQ_IOCTL_CREATE_PORT, &port);
336 if (rc < 0)
337 return rc;
338
339 dp->port = port.addr.port;
340 debug_printk(("new port = %d\n", port.addr.port));
341
342 return 0;
343 }
344
345 /*
346 * delete ALSA port
347 */
348 static int
delete_port(struct seq_oss_devinfo * dp)349 delete_port(struct seq_oss_devinfo *dp)
350 {
351 if (dp->port < 0) {
352 kfree(dp);
353 return 0;
354 }
355
356 debug_printk(("delete_port %i\n", dp->port));
357 return snd_seq_event_port_detach(dp->cseq, dp->port);
358 }
359
360 /*
361 * allocate a queue
362 */
363 static int
alloc_seq_queue(struct seq_oss_devinfo * dp)364 alloc_seq_queue(struct seq_oss_devinfo *dp)
365 {
366 struct snd_seq_queue_info qinfo;
367 int rc;
368
369 memset(&qinfo, 0, sizeof(qinfo));
370 qinfo.owner = system_client;
371 qinfo.locked = 1;
372 strcpy(qinfo.name, "OSS Sequencer Emulation");
373 if ((rc = call_ctl(SNDRV_SEQ_IOCTL_CREATE_QUEUE, &qinfo)) < 0)
374 return rc;
375 dp->queue = qinfo.queue;
376 return 0;
377 }
378
379 /*
380 * release queue
381 */
382 static int
delete_seq_queue(int queue)383 delete_seq_queue(int queue)
384 {
385 struct snd_seq_queue_info qinfo;
386 int rc;
387
388 if (queue < 0)
389 return 0;
390 memset(&qinfo, 0, sizeof(qinfo));
391 qinfo.queue = queue;
392 rc = call_ctl(SNDRV_SEQ_IOCTL_DELETE_QUEUE, &qinfo);
393 if (rc < 0)
394 printk(KERN_ERR "seq-oss: unable to delete queue %d (%d)\n", queue, rc);
395 return rc;
396 }
397
398
399 /*
400 * free device informations - private_free callback of port
401 */
402 static void
free_devinfo(void * private)403 free_devinfo(void *private)
404 {
405 struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private;
406
407 if (dp->timer)
408 snd_seq_oss_timer_delete(dp->timer);
409
410 if (dp->writeq)
411 snd_seq_oss_writeq_delete(dp->writeq);
412
413 if (dp->readq)
414 snd_seq_oss_readq_delete(dp->readq);
415
416 kfree(dp);
417 }
418
419
420 /*
421 * close sequencer device
422 */
423 void
snd_seq_oss_release(struct seq_oss_devinfo * dp)424 snd_seq_oss_release(struct seq_oss_devinfo *dp)
425 {
426 int queue;
427
428 client_table[dp->index] = NULL;
429 num_clients--;
430
431 debug_printk(("resetting..\n"));
432 snd_seq_oss_reset(dp);
433
434 debug_printk(("cleaning up..\n"));
435 snd_seq_oss_synth_cleanup(dp);
436 snd_seq_oss_midi_cleanup(dp);
437
438 /* clear slot */
439 debug_printk(("releasing resource..\n"));
440 queue = dp->queue;
441 if (dp->port >= 0)
442 delete_port(dp);
443 delete_seq_queue(queue);
444
445 debug_printk(("release done\n"));
446 }
447
448
449 /*
450 * Wait until the queue is empty (if we don't have nonblock)
451 */
452 void
snd_seq_oss_drain_write(struct seq_oss_devinfo * dp)453 snd_seq_oss_drain_write(struct seq_oss_devinfo *dp)
454 {
455 if (! dp->timer->running)
456 return;
457 if (is_write_mode(dp->file_mode) && !is_nonblock_mode(dp->file_mode) &&
458 dp->writeq) {
459 debug_printk(("syncing..\n"));
460 while (snd_seq_oss_writeq_sync(dp->writeq))
461 ;
462 }
463 }
464
465
466 /*
467 * reset sequencer devices
468 */
469 void
snd_seq_oss_reset(struct seq_oss_devinfo * dp)470 snd_seq_oss_reset(struct seq_oss_devinfo *dp)
471 {
472 int i;
473
474 /* reset all synth devices */
475 for (i = 0; i < dp->max_synthdev; i++)
476 snd_seq_oss_synth_reset(dp, i);
477
478 /* reset all midi devices */
479 if (dp->seq_mode != SNDRV_SEQ_OSS_MODE_MUSIC) {
480 for (i = 0; i < dp->max_mididev; i++)
481 snd_seq_oss_midi_reset(dp, i);
482 }
483
484 /* remove queues */
485 if (dp->readq)
486 snd_seq_oss_readq_clear(dp->readq);
487 if (dp->writeq)
488 snd_seq_oss_writeq_clear(dp->writeq);
489
490 /* reset timer */
491 snd_seq_oss_timer_stop(dp->timer);
492 }
493
494
495 #ifdef CONFIG_PROC_FS
496 /*
497 * misc. functions for proc interface
498 */
499 char *
enabled_str(int bool)500 enabled_str(int bool)
501 {
502 return bool ? "enabled" : "disabled";
503 }
504
505 static char *
filemode_str(int val)506 filemode_str(int val)
507 {
508 static char *str[] = {
509 "none", "read", "write", "read/write",
510 };
511 return str[val & SNDRV_SEQ_OSS_FILE_ACMODE];
512 }
513
514
515 /*
516 * proc interface
517 */
518 void
snd_seq_oss_system_info_read(struct snd_info_buffer * buf)519 snd_seq_oss_system_info_read(struct snd_info_buffer *buf)
520 {
521 int i;
522 struct seq_oss_devinfo *dp;
523
524 snd_iprintf(buf, "ALSA client number %d\n", system_client);
525 snd_iprintf(buf, "ALSA receiver port %d\n", system_port);
526
527 snd_iprintf(buf, "\nNumber of applications: %d\n", num_clients);
528 for (i = 0; i < num_clients; i++) {
529 snd_iprintf(buf, "\nApplication %d: ", i);
530 if ((dp = client_table[i]) == NULL) {
531 snd_iprintf(buf, "*empty*\n");
532 continue;
533 }
534 snd_iprintf(buf, "port %d : queue %d\n", dp->port, dp->queue);
535 snd_iprintf(buf, " sequencer mode = %s : file open mode = %s\n",
536 (dp->seq_mode ? "music" : "synth"),
537 filemode_str(dp->file_mode));
538 if (dp->seq_mode)
539 snd_iprintf(buf, " timer tempo = %d, timebase = %d\n",
540 dp->timer->oss_tempo, dp->timer->oss_timebase);
541 snd_iprintf(buf, " max queue length %d\n", maxqlen);
542 if (is_read_mode(dp->file_mode) && dp->readq)
543 snd_seq_oss_readq_info_read(dp->readq, buf);
544 }
545 }
546 #endif /* CONFIG_PROC_FS */
547