Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ALSA sequencer Ports | |
3 | * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl> | |
c1017a4c | 4 | * Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
5 | * |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | */ | |
22 | ||
1da177e4 LT |
23 | #include <sound/core.h> |
24 | #include <linux/slab.h> | |
da155d5b | 25 | #include <linux/module.h> |
1da177e4 LT |
26 | #include "seq_system.h" |
27 | #include "seq_ports.h" | |
28 | #include "seq_clientmgr.h" | |
29 | ||
30 | /* | |
31 | ||
32 | registration of client ports | |
33 | ||
34 | */ | |
35 | ||
36 | ||
37 | /* | |
38 | ||
39 | NOTE: the current implementation of the port structure as a linked list is | |
40 | not optimal for clients that have many ports. For sending messages to all | |
41 | subscribers of a port we first need to find the address of the port | |
42 | structure, which means we have to traverse the list. A direct access table | |
43 | (array) would be better, but big preallocated arrays waste memory. | |
44 | ||
45 | Possible actions: | |
46 | ||
47 | 1) leave it this way, a client does normaly does not have more than a few | |
48 | ports | |
49 | ||
50 | 2) replace the linked list of ports by a array of pointers which is | |
51 | dynamicly kmalloced. When a port is added or deleted we can simply allocate | |
52 | a new array, copy the corresponding pointers, and delete the old one. We | |
53 | then only need a pointer to this array, and an integer that tells us how | |
54 | much elements are in array. | |
55 | ||
56 | */ | |
57 | ||
58 | /* return pointer to port structure - port is locked if found */ | |
c7e0b5bf TI |
59 | struct snd_seq_client_port *snd_seq_port_use_ptr(struct snd_seq_client *client, |
60 | int num) | |
1da177e4 | 61 | { |
c7e0b5bf | 62 | struct snd_seq_client_port *port; |
1da177e4 LT |
63 | |
64 | if (client == NULL) | |
65 | return NULL; | |
66 | read_lock(&client->ports_lock); | |
9244b2c3 | 67 | list_for_each_entry(port, &client->ports_list_head, list) { |
1da177e4 LT |
68 | if (port->addr.port == num) { |
69 | if (port->closing) | |
70 | break; /* deleting now */ | |
71 | snd_use_lock_use(&port->use_lock); | |
72 | read_unlock(&client->ports_lock); | |
73 | return port; | |
74 | } | |
75 | } | |
76 | read_unlock(&client->ports_lock); | |
77 | return NULL; /* not found */ | |
78 | } | |
79 | ||
80 | ||
81 | /* search for the next port - port is locked if found */ | |
c7e0b5bf TI |
82 | struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *client, |
83 | struct snd_seq_port_info *pinfo) | |
1da177e4 LT |
84 | { |
85 | int num; | |
c7e0b5bf | 86 | struct snd_seq_client_port *port, *found; |
1da177e4 LT |
87 | |
88 | num = pinfo->addr.port; | |
89 | found = NULL; | |
90 | read_lock(&client->ports_lock); | |
9244b2c3 | 91 | list_for_each_entry(port, &client->ports_list_head, list) { |
1da177e4 LT |
92 | if (port->addr.port < num) |
93 | continue; | |
94 | if (port->addr.port == num) { | |
95 | found = port; | |
96 | break; | |
97 | } | |
98 | if (found == NULL || port->addr.port < found->addr.port) | |
99 | found = port; | |
100 | } | |
101 | if (found) { | |
102 | if (found->closing) | |
103 | found = NULL; | |
104 | else | |
105 | snd_use_lock_use(&found->use_lock); | |
106 | } | |
107 | read_unlock(&client->ports_lock); | |
108 | return found; | |
109 | } | |
110 | ||
111 | ||
c7e0b5bf TI |
112 | /* initialize snd_seq_port_subs_info */ |
113 | static void port_subs_info_init(struct snd_seq_port_subs_info *grp) | |
1da177e4 LT |
114 | { |
115 | INIT_LIST_HEAD(&grp->list_head); | |
116 | grp->count = 0; | |
117 | grp->exclusive = 0; | |
118 | rwlock_init(&grp->list_lock); | |
119 | init_rwsem(&grp->list_mutex); | |
120 | grp->open = NULL; | |
121 | grp->close = NULL; | |
122 | } | |
123 | ||
124 | ||
125 | /* create a port, port number is returned (-1 on failure) */ | |
c7e0b5bf TI |
126 | struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client, |
127 | int port) | |
1da177e4 LT |
128 | { |
129 | unsigned long flags; | |
9244b2c3 | 130 | struct snd_seq_client_port *new_port, *p; |
1da177e4 LT |
131 | int num = -1; |
132 | ||
133 | /* sanity check */ | |
7eaa943c TI |
134 | if (snd_BUG_ON(!client)) |
135 | return NULL; | |
1da177e4 | 136 | |
de20b572 | 137 | if (client->num_ports >= SNDRV_SEQ_MAX_PORTS) { |
04cc79a0 | 138 | pr_warn("ALSA: seq: too many ports for client %d\n", client->number); |
1da177e4 LT |
139 | return NULL; |
140 | } | |
141 | ||
142 | /* create a new port */ | |
ecca82b4 | 143 | new_port = kzalloc(sizeof(*new_port), GFP_KERNEL); |
24db8bba | 144 | if (!new_port) |
1da177e4 | 145 | return NULL; /* failure, out of memory */ |
1da177e4 LT |
146 | /* init port data */ |
147 | new_port->addr.client = client->number; | |
148 | new_port->addr.port = -1; | |
149 | new_port->owner = THIS_MODULE; | |
150 | sprintf(new_port->name, "port-%d", num); | |
151 | snd_use_lock_init(&new_port->use_lock); | |
152 | port_subs_info_init(&new_port->c_src); | |
153 | port_subs_info_init(&new_port->c_dest); | |
154 | ||
155 | num = port >= 0 ? port : 0; | |
1a60d4c5 | 156 | mutex_lock(&client->ports_mutex); |
1da177e4 | 157 | write_lock_irqsave(&client->ports_lock, flags); |
9244b2c3 | 158 | list_for_each_entry(p, &client->ports_list_head, list) { |
1da177e4 LT |
159 | if (p->addr.port > num) |
160 | break; | |
161 | if (port < 0) /* auto-probe mode */ | |
162 | num = p->addr.port + 1; | |
163 | } | |
164 | /* insert the new port */ | |
9244b2c3 | 165 | list_add_tail(&new_port->list, &p->list); |
1da177e4 LT |
166 | client->num_ports++; |
167 | new_port->addr.port = num; /* store the port number in the port */ | |
168 | write_unlock_irqrestore(&client->ports_lock, flags); | |
1a60d4c5 | 169 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
170 | sprintf(new_port->name, "port-%d", num); |
171 | ||
172 | return new_port; | |
173 | } | |
174 | ||
175 | /* */ | |
c7e0b5bf | 176 | enum group_type { |
1da177e4 LT |
177 | SRC_LIST, DEST_LIST |
178 | }; | |
179 | ||
c7e0b5bf TI |
180 | static int subscribe_port(struct snd_seq_client *client, |
181 | struct snd_seq_client_port *port, | |
182 | struct snd_seq_port_subs_info *grp, | |
183 | struct snd_seq_port_subscribe *info, int send_ack); | |
184 | static int unsubscribe_port(struct snd_seq_client *client, | |
185 | struct snd_seq_client_port *port, | |
186 | struct snd_seq_port_subs_info *grp, | |
187 | struct snd_seq_port_subscribe *info, int send_ack); | |
1da177e4 LT |
188 | |
189 | ||
c7e0b5bf TI |
190 | static struct snd_seq_client_port *get_client_port(struct snd_seq_addr *addr, |
191 | struct snd_seq_client **cp) | |
1da177e4 | 192 | { |
c7e0b5bf | 193 | struct snd_seq_client_port *p; |
1da177e4 LT |
194 | *cp = snd_seq_client_use_ptr(addr->client); |
195 | if (*cp) { | |
196 | p = snd_seq_port_use_ptr(*cp, addr->port); | |
197 | if (! p) { | |
198 | snd_seq_client_unlock(*cp); | |
199 | *cp = NULL; | |
200 | } | |
201 | return p; | |
202 | } | |
203 | return NULL; | |
204 | } | |
205 | ||
206 | /* | |
207 | * remove all subscribers on the list | |
208 | * this is called from port_delete, for each src and dest list. | |
209 | */ | |
c7e0b5bf TI |
210 | static void clear_subscriber_list(struct snd_seq_client *client, |
211 | struct snd_seq_client_port *port, | |
212 | struct snd_seq_port_subs_info *grp, | |
213 | int grptype) | |
1da177e4 LT |
214 | { |
215 | struct list_head *p, *n; | |
216 | ||
1da177e4 | 217 | list_for_each_safe(p, n, &grp->list_head) { |
c7e0b5bf TI |
218 | struct snd_seq_subscribers *subs; |
219 | struct snd_seq_client *c; | |
220 | struct snd_seq_client_port *aport; | |
1da177e4 LT |
221 | |
222 | if (grptype == SRC_LIST) { | |
c7e0b5bf | 223 | subs = list_entry(p, struct snd_seq_subscribers, src_list); |
1da177e4 LT |
224 | aport = get_client_port(&subs->info.dest, &c); |
225 | } else { | |
c7e0b5bf | 226 | subs = list_entry(p, struct snd_seq_subscribers, dest_list); |
1da177e4 LT |
227 | aport = get_client_port(&subs->info.sender, &c); |
228 | } | |
229 | list_del(p); | |
230 | unsubscribe_port(client, port, grp, &subs->info, 0); | |
231 | if (!aport) { | |
232 | /* looks like the connected port is being deleted. | |
233 | * we decrease the counter, and when both ports are deleted | |
234 | * remove the subscriber info | |
235 | */ | |
236 | if (atomic_dec_and_test(&subs->ref_count)) | |
237 | kfree(subs); | |
238 | } else { | |
239 | /* ok we got the connected port */ | |
c7e0b5bf | 240 | struct snd_seq_port_subs_info *agrp; |
1da177e4 LT |
241 | agrp = (grptype == SRC_LIST) ? &aport->c_dest : &aport->c_src; |
242 | down_write(&agrp->list_mutex); | |
243 | if (grptype == SRC_LIST) | |
244 | list_del(&subs->dest_list); | |
245 | else | |
246 | list_del(&subs->src_list); | |
6116ea07 | 247 | up_write(&agrp->list_mutex); |
1da177e4 LT |
248 | unsubscribe_port(c, aport, agrp, &subs->info, 1); |
249 | kfree(subs); | |
1da177e4 LT |
250 | snd_seq_port_unlock(aport); |
251 | snd_seq_client_unlock(c); | |
252 | } | |
253 | } | |
1da177e4 LT |
254 | } |
255 | ||
256 | /* delete port data */ | |
c7e0b5bf TI |
257 | static int port_delete(struct snd_seq_client *client, |
258 | struct snd_seq_client_port *port) | |
1da177e4 LT |
259 | { |
260 | /* set closing flag and wait for all port access are gone */ | |
261 | port->closing = 1; | |
262 | snd_use_lock_sync(&port->use_lock); | |
263 | ||
264 | /* clear subscribers info */ | |
265 | clear_subscriber_list(client, port, &port->c_src, SRC_LIST); | |
266 | clear_subscriber_list(client, port, &port->c_dest, DEST_LIST); | |
267 | ||
268 | if (port->private_free) | |
269 | port->private_free(port->private_data); | |
270 | ||
7eaa943c TI |
271 | snd_BUG_ON(port->c_src.count != 0); |
272 | snd_BUG_ON(port->c_dest.count != 0); | |
1da177e4 LT |
273 | |
274 | kfree(port); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | ||
279 | /* delete a port with the given port id */ | |
c7e0b5bf | 280 | int snd_seq_delete_port(struct snd_seq_client *client, int port) |
1da177e4 LT |
281 | { |
282 | unsigned long flags; | |
9244b2c3 | 283 | struct snd_seq_client_port *found = NULL, *p; |
1da177e4 | 284 | |
1a60d4c5 | 285 | mutex_lock(&client->ports_mutex); |
1da177e4 | 286 | write_lock_irqsave(&client->ports_lock, flags); |
9244b2c3 | 287 | list_for_each_entry(p, &client->ports_list_head, list) { |
1da177e4 LT |
288 | if (p->addr.port == port) { |
289 | /* ok found. delete from the list at first */ | |
9244b2c3 | 290 | list_del(&p->list); |
1da177e4 LT |
291 | client->num_ports--; |
292 | found = p; | |
293 | break; | |
294 | } | |
295 | } | |
296 | write_unlock_irqrestore(&client->ports_lock, flags); | |
1a60d4c5 | 297 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
298 | if (found) |
299 | return port_delete(client, found); | |
300 | else | |
301 | return -ENOENT; | |
302 | } | |
303 | ||
304 | /* delete the all ports belonging to the given client */ | |
c7e0b5bf | 305 | int snd_seq_delete_all_ports(struct snd_seq_client *client) |
1da177e4 LT |
306 | { |
307 | unsigned long flags; | |
9244b2c3 JB |
308 | struct list_head deleted_list; |
309 | struct snd_seq_client_port *port, *tmp; | |
1da177e4 LT |
310 | |
311 | /* move the port list to deleted_list, and | |
312 | * clear the port list in the client data. | |
313 | */ | |
1a60d4c5 | 314 | mutex_lock(&client->ports_mutex); |
1da177e4 LT |
315 | write_lock_irqsave(&client->ports_lock, flags); |
316 | if (! list_empty(&client->ports_list_head)) { | |
be7ee278 TI |
317 | list_add(&deleted_list, &client->ports_list_head); |
318 | list_del_init(&client->ports_list_head); | |
1da177e4 LT |
319 | } else { |
320 | INIT_LIST_HEAD(&deleted_list); | |
321 | } | |
322 | client->num_ports = 0; | |
323 | write_unlock_irqrestore(&client->ports_lock, flags); | |
324 | ||
325 | /* remove each port in deleted_list */ | |
9244b2c3 JB |
326 | list_for_each_entry_safe(port, tmp, &deleted_list, list) { |
327 | list_del(&port->list); | |
1da177e4 LT |
328 | snd_seq_system_client_ev_port_exit(port->addr.client, port->addr.port); |
329 | port_delete(client, port); | |
330 | } | |
1a60d4c5 | 331 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
332 | return 0; |
333 | } | |
334 | ||
335 | /* set port info fields */ | |
c7e0b5bf TI |
336 | int snd_seq_set_port_info(struct snd_seq_client_port * port, |
337 | struct snd_seq_port_info * info) | |
1da177e4 | 338 | { |
7eaa943c TI |
339 | if (snd_BUG_ON(!port || !info)) |
340 | return -EINVAL; | |
1da177e4 LT |
341 | |
342 | /* set port name */ | |
343 | if (info->name[0]) | |
344 | strlcpy(port->name, info->name, sizeof(port->name)); | |
345 | ||
346 | /* set capabilities */ | |
347 | port->capability = info->capability; | |
348 | ||
349 | /* get port type */ | |
350 | port->type = info->type; | |
351 | ||
352 | /* information about supported channels/voices */ | |
353 | port->midi_channels = info->midi_channels; | |
354 | port->midi_voices = info->midi_voices; | |
355 | port->synth_voices = info->synth_voices; | |
356 | ||
357 | /* timestamping */ | |
358 | port->timestamping = (info->flags & SNDRV_SEQ_PORT_FLG_TIMESTAMP) ? 1 : 0; | |
359 | port->time_real = (info->flags & SNDRV_SEQ_PORT_FLG_TIME_REAL) ? 1 : 0; | |
360 | port->time_queue = info->time_queue; | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | /* get port info fields */ | |
c7e0b5bf TI |
366 | int snd_seq_get_port_info(struct snd_seq_client_port * port, |
367 | struct snd_seq_port_info * info) | |
1da177e4 | 368 | { |
7eaa943c TI |
369 | if (snd_BUG_ON(!port || !info)) |
370 | return -EINVAL; | |
1da177e4 LT |
371 | |
372 | /* get port name */ | |
373 | strlcpy(info->name, port->name, sizeof(info->name)); | |
374 | ||
375 | /* get capabilities */ | |
376 | info->capability = port->capability; | |
377 | ||
378 | /* get port type */ | |
379 | info->type = port->type; | |
380 | ||
381 | /* information about supported channels/voices */ | |
382 | info->midi_channels = port->midi_channels; | |
383 | info->midi_voices = port->midi_voices; | |
384 | info->synth_voices = port->synth_voices; | |
385 | ||
386 | /* get subscriber counts */ | |
387 | info->read_use = port->c_src.count; | |
388 | info->write_use = port->c_dest.count; | |
389 | ||
390 | /* timestamping */ | |
391 | info->flags = 0; | |
392 | if (port->timestamping) { | |
393 | info->flags |= SNDRV_SEQ_PORT_FLG_TIMESTAMP; | |
394 | if (port->time_real) | |
395 | info->flags |= SNDRV_SEQ_PORT_FLG_TIME_REAL; | |
396 | info->time_queue = port->time_queue; | |
397 | } | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | ||
403 | ||
404 | /* | |
405 | * call callback functions (if any): | |
406 | * the callbacks are invoked only when the first (for connection) or | |
407 | * the last subscription (for disconnection) is done. Second or later | |
408 | * subscription results in increment of counter, but no callback is | |
409 | * invoked. | |
410 | * This feature is useful if these callbacks are associated with | |
411 | * initialization or termination of devices (see seq_midi.c). | |
1da177e4 LT |
412 | */ |
413 | ||
c7e0b5bf TI |
414 | static int subscribe_port(struct snd_seq_client *client, |
415 | struct snd_seq_client_port *port, | |
416 | struct snd_seq_port_subs_info *grp, | |
417 | struct snd_seq_port_subscribe *info, | |
418 | int send_ack) | |
1da177e4 LT |
419 | { |
420 | int err = 0; | |
421 | ||
422 | if (!try_module_get(port->owner)) | |
423 | return -EFAULT; | |
424 | grp->count++; | |
a55bdf1e | 425 | if (grp->open && grp->count == 1) { |
1da177e4 LT |
426 | err = grp->open(port->private_data, info); |
427 | if (err < 0) { | |
428 | module_put(port->owner); | |
429 | grp->count--; | |
430 | } | |
431 | } | |
432 | if (err >= 0 && send_ack && client->type == USER_CLIENT) | |
433 | snd_seq_client_notify_subscription(port->addr.client, port->addr.port, | |
434 | info, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); | |
435 | ||
436 | return err; | |
437 | } | |
438 | ||
c7e0b5bf TI |
439 | static int unsubscribe_port(struct snd_seq_client *client, |
440 | struct snd_seq_client_port *port, | |
441 | struct snd_seq_port_subs_info *grp, | |
442 | struct snd_seq_port_subscribe *info, | |
443 | int send_ack) | |
1da177e4 LT |
444 | { |
445 | int err = 0; | |
446 | ||
447 | if (! grp->count) | |
448 | return -EINVAL; | |
449 | grp->count--; | |
a55bdf1e | 450 | if (grp->close && grp->count == 0) |
1da177e4 LT |
451 | err = grp->close(port->private_data, info); |
452 | if (send_ack && client->type == USER_CLIENT) | |
453 | snd_seq_client_notify_subscription(port->addr.client, port->addr.port, | |
454 | info, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); | |
455 | module_put(port->owner); | |
456 | return err; | |
457 | } | |
458 | ||
459 | ||
460 | ||
461 | /* check if both addresses are identical */ | |
c7e0b5bf | 462 | static inline int addr_match(struct snd_seq_addr *r, struct snd_seq_addr *s) |
1da177e4 LT |
463 | { |
464 | return (r->client == s->client) && (r->port == s->port); | |
465 | } | |
466 | ||
467 | /* check the two subscribe info match */ | |
468 | /* if flags is zero, checks only sender and destination addresses */ | |
c7e0b5bf TI |
469 | static int match_subs_info(struct snd_seq_port_subscribe *r, |
470 | struct snd_seq_port_subscribe *s) | |
1da177e4 LT |
471 | { |
472 | if (addr_match(&r->sender, &s->sender) && | |
473 | addr_match(&r->dest, &s->dest)) { | |
474 | if (r->flags && r->flags == s->flags) | |
475 | return r->queue == s->queue; | |
476 | else if (! r->flags) | |
477 | return 1; | |
478 | } | |
479 | return 0; | |
480 | } | |
481 | ||
482 | ||
483 | /* connect two ports */ | |
c7e0b5bf TI |
484 | int snd_seq_port_connect(struct snd_seq_client *connector, |
485 | struct snd_seq_client *src_client, | |
486 | struct snd_seq_client_port *src_port, | |
487 | struct snd_seq_client *dest_client, | |
488 | struct snd_seq_client_port *dest_port, | |
489 | struct snd_seq_port_subscribe *info) | |
1da177e4 | 490 | { |
c7e0b5bf TI |
491 | struct snd_seq_port_subs_info *src = &src_port->c_src; |
492 | struct snd_seq_port_subs_info *dest = &dest_port->c_dest; | |
9244b2c3 | 493 | struct snd_seq_subscribers *subs, *s; |
1da177e4 LT |
494 | int err, src_called = 0; |
495 | unsigned long flags; | |
496 | int exclusive; | |
497 | ||
ecca82b4 | 498 | subs = kzalloc(sizeof(*subs), GFP_KERNEL); |
1da177e4 LT |
499 | if (! subs) |
500 | return -ENOMEM; | |
501 | ||
502 | subs->info = *info; | |
503 | atomic_set(&subs->ref_count, 2); | |
504 | ||
505 | down_write(&src->list_mutex); | |
d8371f04 | 506 | down_write_nested(&dest->list_mutex, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
507 | |
508 | exclusive = info->flags & SNDRV_SEQ_PORT_SUBS_EXCLUSIVE ? 1 : 0; | |
509 | err = -EBUSY; | |
510 | if (exclusive) { | |
511 | if (! list_empty(&src->list_head) || ! list_empty(&dest->list_head)) | |
512 | goto __error; | |
513 | } else { | |
514 | if (src->exclusive || dest->exclusive) | |
515 | goto __error; | |
516 | /* check whether already exists */ | |
9244b2c3 | 517 | list_for_each_entry(s, &src->list_head, src_list) { |
1da177e4 LT |
518 | if (match_subs_info(info, &s->info)) |
519 | goto __error; | |
520 | } | |
9244b2c3 | 521 | list_for_each_entry(s, &dest->list_head, dest_list) { |
1da177e4 LT |
522 | if (match_subs_info(info, &s->info)) |
523 | goto __error; | |
524 | } | |
525 | } | |
526 | ||
527 | if ((err = subscribe_port(src_client, src_port, src, info, | |
528 | connector->number != src_client->number)) < 0) | |
529 | goto __error; | |
530 | src_called = 1; | |
531 | ||
532 | if ((err = subscribe_port(dest_client, dest_port, dest, info, | |
533 | connector->number != dest_client->number)) < 0) | |
534 | goto __error; | |
535 | ||
536 | /* add to list */ | |
537 | write_lock_irqsave(&src->list_lock, flags); | |
538 | // write_lock(&dest->list_lock); // no other lock yet | |
539 | list_add_tail(&subs->src_list, &src->list_head); | |
540 | list_add_tail(&subs->dest_list, &dest->list_head); | |
541 | // write_unlock(&dest->list_lock); // no other lock yet | |
542 | write_unlock_irqrestore(&src->list_lock, flags); | |
543 | ||
544 | src->exclusive = dest->exclusive = exclusive; | |
545 | ||
546 | up_write(&dest->list_mutex); | |
547 | up_write(&src->list_mutex); | |
548 | return 0; | |
549 | ||
550 | __error: | |
551 | if (src_called) | |
552 | unsubscribe_port(src_client, src_port, src, info, | |
553 | connector->number != src_client->number); | |
554 | kfree(subs); | |
555 | up_write(&dest->list_mutex); | |
556 | up_write(&src->list_mutex); | |
557 | return err; | |
558 | } | |
559 | ||
560 | ||
561 | /* remove the connection */ | |
c7e0b5bf TI |
562 | int snd_seq_port_disconnect(struct snd_seq_client *connector, |
563 | struct snd_seq_client *src_client, | |
564 | struct snd_seq_client_port *src_port, | |
565 | struct snd_seq_client *dest_client, | |
566 | struct snd_seq_client_port *dest_port, | |
567 | struct snd_seq_port_subscribe *info) | |
1da177e4 | 568 | { |
c7e0b5bf TI |
569 | struct snd_seq_port_subs_info *src = &src_port->c_src; |
570 | struct snd_seq_port_subs_info *dest = &dest_port->c_dest; | |
571 | struct snd_seq_subscribers *subs; | |
1da177e4 LT |
572 | int err = -ENOENT; |
573 | unsigned long flags; | |
574 | ||
575 | down_write(&src->list_mutex); | |
d8371f04 | 576 | down_write_nested(&dest->list_mutex, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
577 | |
578 | /* look for the connection */ | |
9244b2c3 | 579 | list_for_each_entry(subs, &src->list_head, src_list) { |
1da177e4 LT |
580 | if (match_subs_info(info, &subs->info)) { |
581 | write_lock_irqsave(&src->list_lock, flags); | |
582 | // write_lock(&dest->list_lock); // no lock yet | |
583 | list_del(&subs->src_list); | |
584 | list_del(&subs->dest_list); | |
585 | // write_unlock(&dest->list_lock); | |
586 | write_unlock_irqrestore(&src->list_lock, flags); | |
587 | src->exclusive = dest->exclusive = 0; | |
588 | unsubscribe_port(src_client, src_port, src, info, | |
589 | connector->number != src_client->number); | |
590 | unsubscribe_port(dest_client, dest_port, dest, info, | |
591 | connector->number != dest_client->number); | |
592 | kfree(subs); | |
593 | err = 0; | |
594 | break; | |
595 | } | |
596 | } | |
597 | ||
598 | up_write(&dest->list_mutex); | |
599 | up_write(&src->list_mutex); | |
600 | return err; | |
601 | } | |
602 | ||
603 | ||
604 | /* get matched subscriber */ | |
c7e0b5bf TI |
605 | struct snd_seq_subscribers *snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp, |
606 | struct snd_seq_addr *dest_addr) | |
1da177e4 | 607 | { |
c7e0b5bf | 608 | struct snd_seq_subscribers *s, *found = NULL; |
1da177e4 LT |
609 | |
610 | down_read(&src_grp->list_mutex); | |
9244b2c3 | 611 | list_for_each_entry(s, &src_grp->list_head, src_list) { |
1da177e4 LT |
612 | if (addr_match(dest_addr, &s->info.dest)) { |
613 | found = s; | |
614 | break; | |
615 | } | |
616 | } | |
617 | up_read(&src_grp->list_mutex); | |
618 | return found; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Attach a device driver that wants to receive events from the | |
623 | * sequencer. Returns the new port number on success. | |
624 | * A driver that wants to receive the events converted to midi, will | |
625 | * use snd_seq_midisynth_register_port(). | |
626 | */ | |
627 | /* exported */ | |
628 | int snd_seq_event_port_attach(int client, | |
c7e0b5bf | 629 | struct snd_seq_port_callback *pcbp, |
1da177e4 LT |
630 | int cap, int type, int midi_channels, |
631 | int midi_voices, char *portname) | |
632 | { | |
c7e0b5bf | 633 | struct snd_seq_port_info portinfo; |
1da177e4 LT |
634 | int ret; |
635 | ||
636 | /* Set up the port */ | |
637 | memset(&portinfo, 0, sizeof(portinfo)); | |
638 | portinfo.addr.client = client; | |
639 | strlcpy(portinfo.name, portname ? portname : "Unamed port", | |
640 | sizeof(portinfo.name)); | |
641 | ||
642 | portinfo.capability = cap; | |
643 | portinfo.type = type; | |
644 | portinfo.kernel = pcbp; | |
645 | portinfo.midi_channels = midi_channels; | |
646 | portinfo.midi_voices = midi_voices; | |
647 | ||
648 | /* Create it */ | |
649 | ret = snd_seq_kernel_client_ctl(client, | |
650 | SNDRV_SEQ_IOCTL_CREATE_PORT, | |
651 | &portinfo); | |
652 | ||
653 | if (ret >= 0) | |
654 | ret = portinfo.addr.port; | |
655 | ||
656 | return ret; | |
657 | } | |
658 | ||
91715ed9 | 659 | EXPORT_SYMBOL(snd_seq_event_port_attach); |
1da177e4 LT |
660 | |
661 | /* | |
662 | * Detach the driver from a port. | |
663 | */ | |
664 | /* exported */ | |
665 | int snd_seq_event_port_detach(int client, int port) | |
666 | { | |
c7e0b5bf | 667 | struct snd_seq_port_info portinfo; |
1da177e4 LT |
668 | int err; |
669 | ||
670 | memset(&portinfo, 0, sizeof(portinfo)); | |
671 | portinfo.addr.client = client; | |
672 | portinfo.addr.port = port; | |
673 | err = snd_seq_kernel_client_ctl(client, | |
674 | SNDRV_SEQ_IOCTL_DELETE_PORT, | |
675 | &portinfo); | |
676 | ||
677 | return err; | |
678 | } | |
91715ed9 TI |
679 | |
680 | EXPORT_SYMBOL(snd_seq_event_port_detach); |