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> | |
4 | * Jaroslav Kysela <perex@suse.cz> | |
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 | ||
23 | #include <sound/driver.h> | |
24 | #include <sound/core.h> | |
25 | #include <linux/slab.h> | |
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 LT |
61 | { |
62 | struct list_head *p; | |
c7e0b5bf | 63 | struct snd_seq_client_port *port; |
1da177e4 LT |
64 | |
65 | if (client == NULL) | |
66 | return NULL; | |
67 | read_lock(&client->ports_lock); | |
68 | list_for_each(p, &client->ports_list_head) { | |
c7e0b5bf | 69 | port = list_entry(p, struct snd_seq_client_port, list); |
1da177e4 LT |
70 | if (port->addr.port == num) { |
71 | if (port->closing) | |
72 | break; /* deleting now */ | |
73 | snd_use_lock_use(&port->use_lock); | |
74 | read_unlock(&client->ports_lock); | |
75 | return port; | |
76 | } | |
77 | } | |
78 | read_unlock(&client->ports_lock); | |
79 | return NULL; /* not found */ | |
80 | } | |
81 | ||
82 | ||
83 | /* search for the next port - port is locked if found */ | |
c7e0b5bf TI |
84 | struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *client, |
85 | struct snd_seq_port_info *pinfo) | |
1da177e4 LT |
86 | { |
87 | int num; | |
88 | struct list_head *p; | |
c7e0b5bf | 89 | struct snd_seq_client_port *port, *found; |
1da177e4 LT |
90 | |
91 | num = pinfo->addr.port; | |
92 | found = NULL; | |
93 | read_lock(&client->ports_lock); | |
94 | list_for_each(p, &client->ports_list_head) { | |
c7e0b5bf | 95 | port = list_entry(p, struct snd_seq_client_port, list); |
1da177e4 LT |
96 | if (port->addr.port < num) |
97 | continue; | |
98 | if (port->addr.port == num) { | |
99 | found = port; | |
100 | break; | |
101 | } | |
102 | if (found == NULL || port->addr.port < found->addr.port) | |
103 | found = port; | |
104 | } | |
105 | if (found) { | |
106 | if (found->closing) | |
107 | found = NULL; | |
108 | else | |
109 | snd_use_lock_use(&found->use_lock); | |
110 | } | |
111 | read_unlock(&client->ports_lock); | |
112 | return found; | |
113 | } | |
114 | ||
115 | ||
c7e0b5bf TI |
116 | /* initialize snd_seq_port_subs_info */ |
117 | static void port_subs_info_init(struct snd_seq_port_subs_info *grp) | |
1da177e4 LT |
118 | { |
119 | INIT_LIST_HEAD(&grp->list_head); | |
120 | grp->count = 0; | |
121 | grp->exclusive = 0; | |
122 | rwlock_init(&grp->list_lock); | |
123 | init_rwsem(&grp->list_mutex); | |
124 | grp->open = NULL; | |
125 | grp->close = NULL; | |
126 | } | |
127 | ||
128 | ||
129 | /* create a port, port number is returned (-1 on failure) */ | |
c7e0b5bf TI |
130 | struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client, |
131 | int port) | |
1da177e4 LT |
132 | { |
133 | unsigned long flags; | |
c7e0b5bf | 134 | struct snd_seq_client_port *new_port; |
1da177e4 LT |
135 | struct list_head *l; |
136 | int num = -1; | |
137 | ||
138 | /* sanity check */ | |
139 | snd_assert(client, return NULL); | |
140 | ||
141 | if (client->num_ports >= SNDRV_SEQ_MAX_PORTS - 1) { | |
142 | snd_printk(KERN_WARNING "too many ports for client %d\n", client->number); | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | /* create a new port */ | |
ecca82b4 | 147 | new_port = kzalloc(sizeof(*new_port), GFP_KERNEL); |
1da177e4 LT |
148 | if (! new_port) { |
149 | snd_printd("malloc failed for registering client port\n"); | |
150 | return NULL; /* failure, out of memory */ | |
151 | } | |
152 | /* init port data */ | |
153 | new_port->addr.client = client->number; | |
154 | new_port->addr.port = -1; | |
155 | new_port->owner = THIS_MODULE; | |
156 | sprintf(new_port->name, "port-%d", num); | |
157 | snd_use_lock_init(&new_port->use_lock); | |
158 | port_subs_info_init(&new_port->c_src); | |
159 | port_subs_info_init(&new_port->c_dest); | |
160 | ||
161 | num = port >= 0 ? port : 0; | |
1a60d4c5 | 162 | mutex_lock(&client->ports_mutex); |
1da177e4 LT |
163 | write_lock_irqsave(&client->ports_lock, flags); |
164 | list_for_each(l, &client->ports_list_head) { | |
c7e0b5bf | 165 | struct snd_seq_client_port *p = list_entry(l, struct snd_seq_client_port, list); |
1da177e4 LT |
166 | if (p->addr.port > num) |
167 | break; | |
168 | if (port < 0) /* auto-probe mode */ | |
169 | num = p->addr.port + 1; | |
170 | } | |
171 | /* insert the new port */ | |
172 | list_add_tail(&new_port->list, l); | |
173 | client->num_ports++; | |
174 | new_port->addr.port = num; /* store the port number in the port */ | |
175 | write_unlock_irqrestore(&client->ports_lock, flags); | |
1a60d4c5 | 176 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
177 | sprintf(new_port->name, "port-%d", num); |
178 | ||
179 | return new_port; | |
180 | } | |
181 | ||
182 | /* */ | |
c7e0b5bf | 183 | enum group_type { |
1da177e4 LT |
184 | SRC_LIST, DEST_LIST |
185 | }; | |
186 | ||
c7e0b5bf TI |
187 | static int subscribe_port(struct snd_seq_client *client, |
188 | struct snd_seq_client_port *port, | |
189 | struct snd_seq_port_subs_info *grp, | |
190 | struct snd_seq_port_subscribe *info, int send_ack); | |
191 | static int unsubscribe_port(struct snd_seq_client *client, | |
192 | struct snd_seq_client_port *port, | |
193 | struct snd_seq_port_subs_info *grp, | |
194 | struct snd_seq_port_subscribe *info, int send_ack); | |
1da177e4 LT |
195 | |
196 | ||
c7e0b5bf TI |
197 | static struct snd_seq_client_port *get_client_port(struct snd_seq_addr *addr, |
198 | struct snd_seq_client **cp) | |
1da177e4 | 199 | { |
c7e0b5bf | 200 | struct snd_seq_client_port *p; |
1da177e4 LT |
201 | *cp = snd_seq_client_use_ptr(addr->client); |
202 | if (*cp) { | |
203 | p = snd_seq_port_use_ptr(*cp, addr->port); | |
204 | if (! p) { | |
205 | snd_seq_client_unlock(*cp); | |
206 | *cp = NULL; | |
207 | } | |
208 | return p; | |
209 | } | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | /* | |
214 | * remove all subscribers on the list | |
215 | * this is called from port_delete, for each src and dest list. | |
216 | */ | |
c7e0b5bf TI |
217 | static void clear_subscriber_list(struct snd_seq_client *client, |
218 | struct snd_seq_client_port *port, | |
219 | struct snd_seq_port_subs_info *grp, | |
220 | int grptype) | |
1da177e4 LT |
221 | { |
222 | struct list_head *p, *n; | |
223 | ||
224 | down_write(&grp->list_mutex); | |
225 | list_for_each_safe(p, n, &grp->list_head) { | |
c7e0b5bf TI |
226 | struct snd_seq_subscribers *subs; |
227 | struct snd_seq_client *c; | |
228 | struct snd_seq_client_port *aport; | |
1da177e4 LT |
229 | |
230 | if (grptype == SRC_LIST) { | |
c7e0b5bf | 231 | subs = list_entry(p, struct snd_seq_subscribers, src_list); |
1da177e4 LT |
232 | aport = get_client_port(&subs->info.dest, &c); |
233 | } else { | |
c7e0b5bf | 234 | subs = list_entry(p, struct snd_seq_subscribers, dest_list); |
1da177e4 LT |
235 | aport = get_client_port(&subs->info.sender, &c); |
236 | } | |
237 | list_del(p); | |
238 | unsubscribe_port(client, port, grp, &subs->info, 0); | |
239 | if (!aport) { | |
240 | /* looks like the connected port is being deleted. | |
241 | * we decrease the counter, and when both ports are deleted | |
242 | * remove the subscriber info | |
243 | */ | |
244 | if (atomic_dec_and_test(&subs->ref_count)) | |
245 | kfree(subs); | |
246 | } else { | |
247 | /* ok we got the connected port */ | |
c7e0b5bf | 248 | struct snd_seq_port_subs_info *agrp; |
1da177e4 LT |
249 | agrp = (grptype == SRC_LIST) ? &aport->c_dest : &aport->c_src; |
250 | down_write(&agrp->list_mutex); | |
251 | if (grptype == SRC_LIST) | |
252 | list_del(&subs->dest_list); | |
253 | else | |
254 | list_del(&subs->src_list); | |
255 | unsubscribe_port(c, aport, agrp, &subs->info, 1); | |
256 | kfree(subs); | |
257 | up_write(&agrp->list_mutex); | |
258 | snd_seq_port_unlock(aport); | |
259 | snd_seq_client_unlock(c); | |
260 | } | |
261 | } | |
262 | up_write(&grp->list_mutex); | |
263 | } | |
264 | ||
265 | /* delete port data */ | |
c7e0b5bf TI |
266 | static int port_delete(struct snd_seq_client *client, |
267 | struct snd_seq_client_port *port) | |
1da177e4 LT |
268 | { |
269 | /* set closing flag and wait for all port access are gone */ | |
270 | port->closing = 1; | |
271 | snd_use_lock_sync(&port->use_lock); | |
272 | ||
273 | /* clear subscribers info */ | |
274 | clear_subscriber_list(client, port, &port->c_src, SRC_LIST); | |
275 | clear_subscriber_list(client, port, &port->c_dest, DEST_LIST); | |
276 | ||
277 | if (port->private_free) | |
278 | port->private_free(port->private_data); | |
279 | ||
280 | snd_assert(port->c_src.count == 0,); | |
281 | snd_assert(port->c_dest.count == 0,); | |
282 | ||
283 | kfree(port); | |
284 | return 0; | |
285 | } | |
286 | ||
287 | ||
288 | /* delete a port with the given port id */ | |
c7e0b5bf | 289 | int snd_seq_delete_port(struct snd_seq_client *client, int port) |
1da177e4 LT |
290 | { |
291 | unsigned long flags; | |
292 | struct list_head *l; | |
c7e0b5bf | 293 | struct snd_seq_client_port *found = NULL; |
1da177e4 | 294 | |
1a60d4c5 | 295 | mutex_lock(&client->ports_mutex); |
1da177e4 LT |
296 | write_lock_irqsave(&client->ports_lock, flags); |
297 | list_for_each(l, &client->ports_list_head) { | |
c7e0b5bf | 298 | struct snd_seq_client_port *p = list_entry(l, struct snd_seq_client_port, list); |
1da177e4 LT |
299 | if (p->addr.port == port) { |
300 | /* ok found. delete from the list at first */ | |
301 | list_del(l); | |
302 | client->num_ports--; | |
303 | found = p; | |
304 | break; | |
305 | } | |
306 | } | |
307 | write_unlock_irqrestore(&client->ports_lock, flags); | |
1a60d4c5 | 308 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
309 | if (found) |
310 | return port_delete(client, found); | |
311 | else | |
312 | return -ENOENT; | |
313 | } | |
314 | ||
315 | /* delete the all ports belonging to the given client */ | |
c7e0b5bf | 316 | int snd_seq_delete_all_ports(struct snd_seq_client *client) |
1da177e4 LT |
317 | { |
318 | unsigned long flags; | |
319 | struct list_head deleted_list, *p, *n; | |
320 | ||
321 | /* move the port list to deleted_list, and | |
322 | * clear the port list in the client data. | |
323 | */ | |
1a60d4c5 | 324 | mutex_lock(&client->ports_mutex); |
1da177e4 LT |
325 | write_lock_irqsave(&client->ports_lock, flags); |
326 | if (! list_empty(&client->ports_list_head)) { | |
327 | __list_add(&deleted_list, | |
328 | client->ports_list_head.prev, | |
329 | client->ports_list_head.next); | |
330 | INIT_LIST_HEAD(&client->ports_list_head); | |
331 | } else { | |
332 | INIT_LIST_HEAD(&deleted_list); | |
333 | } | |
334 | client->num_ports = 0; | |
335 | write_unlock_irqrestore(&client->ports_lock, flags); | |
336 | ||
337 | /* remove each port in deleted_list */ | |
338 | list_for_each_safe(p, n, &deleted_list) { | |
c7e0b5bf | 339 | struct snd_seq_client_port *port = list_entry(p, struct snd_seq_client_port, list); |
1da177e4 LT |
340 | list_del(p); |
341 | snd_seq_system_client_ev_port_exit(port->addr.client, port->addr.port); | |
342 | port_delete(client, port); | |
343 | } | |
1a60d4c5 | 344 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
345 | return 0; |
346 | } | |
347 | ||
348 | /* set port info fields */ | |
c7e0b5bf TI |
349 | int snd_seq_set_port_info(struct snd_seq_client_port * port, |
350 | struct snd_seq_port_info * info) | |
1da177e4 LT |
351 | { |
352 | snd_assert(port && info, return -EINVAL); | |
353 | ||
354 | /* set port name */ | |
355 | if (info->name[0]) | |
356 | strlcpy(port->name, info->name, sizeof(port->name)); | |
357 | ||
358 | /* set capabilities */ | |
359 | port->capability = info->capability; | |
360 | ||
361 | /* get port type */ | |
362 | port->type = info->type; | |
363 | ||
364 | /* information about supported channels/voices */ | |
365 | port->midi_channels = info->midi_channels; | |
366 | port->midi_voices = info->midi_voices; | |
367 | port->synth_voices = info->synth_voices; | |
368 | ||
369 | /* timestamping */ | |
370 | port->timestamping = (info->flags & SNDRV_SEQ_PORT_FLG_TIMESTAMP) ? 1 : 0; | |
371 | port->time_real = (info->flags & SNDRV_SEQ_PORT_FLG_TIME_REAL) ? 1 : 0; | |
372 | port->time_queue = info->time_queue; | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | /* get port info fields */ | |
c7e0b5bf TI |
378 | int snd_seq_get_port_info(struct snd_seq_client_port * port, |
379 | struct snd_seq_port_info * info) | |
1da177e4 LT |
380 | { |
381 | snd_assert(port && info, return -EINVAL); | |
382 | ||
383 | /* get port name */ | |
384 | strlcpy(info->name, port->name, sizeof(info->name)); | |
385 | ||
386 | /* get capabilities */ | |
387 | info->capability = port->capability; | |
388 | ||
389 | /* get port type */ | |
390 | info->type = port->type; | |
391 | ||
392 | /* information about supported channels/voices */ | |
393 | info->midi_channels = port->midi_channels; | |
394 | info->midi_voices = port->midi_voices; | |
395 | info->synth_voices = port->synth_voices; | |
396 | ||
397 | /* get subscriber counts */ | |
398 | info->read_use = port->c_src.count; | |
399 | info->write_use = port->c_dest.count; | |
400 | ||
401 | /* timestamping */ | |
402 | info->flags = 0; | |
403 | if (port->timestamping) { | |
404 | info->flags |= SNDRV_SEQ_PORT_FLG_TIMESTAMP; | |
405 | if (port->time_real) | |
406 | info->flags |= SNDRV_SEQ_PORT_FLG_TIME_REAL; | |
407 | info->time_queue = port->time_queue; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | ||
414 | ||
415 | /* | |
416 | * call callback functions (if any): | |
417 | * the callbacks are invoked only when the first (for connection) or | |
418 | * the last subscription (for disconnection) is done. Second or later | |
419 | * subscription results in increment of counter, but no callback is | |
420 | * invoked. | |
421 | * This feature is useful if these callbacks are associated with | |
422 | * initialization or termination of devices (see seq_midi.c). | |
423 | * | |
424 | * If callback_all option is set, the callback function is invoked | |
425 | * at each connnection/disconnection. | |
426 | */ | |
427 | ||
c7e0b5bf TI |
428 | static int subscribe_port(struct snd_seq_client *client, |
429 | struct snd_seq_client_port *port, | |
430 | struct snd_seq_port_subs_info *grp, | |
431 | struct snd_seq_port_subscribe *info, | |
432 | int send_ack) | |
1da177e4 LT |
433 | { |
434 | int err = 0; | |
435 | ||
436 | if (!try_module_get(port->owner)) | |
437 | return -EFAULT; | |
438 | grp->count++; | |
439 | if (grp->open && (port->callback_all || grp->count == 1)) { | |
440 | err = grp->open(port->private_data, info); | |
441 | if (err < 0) { | |
442 | module_put(port->owner); | |
443 | grp->count--; | |
444 | } | |
445 | } | |
446 | if (err >= 0 && send_ack && client->type == USER_CLIENT) | |
447 | snd_seq_client_notify_subscription(port->addr.client, port->addr.port, | |
448 | info, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); | |
449 | ||
450 | return err; | |
451 | } | |
452 | ||
c7e0b5bf TI |
453 | static int unsubscribe_port(struct snd_seq_client *client, |
454 | struct snd_seq_client_port *port, | |
455 | struct snd_seq_port_subs_info *grp, | |
456 | struct snd_seq_port_subscribe *info, | |
457 | int send_ack) | |
1da177e4 LT |
458 | { |
459 | int err = 0; | |
460 | ||
461 | if (! grp->count) | |
462 | return -EINVAL; | |
463 | grp->count--; | |
464 | if (grp->close && (port->callback_all || grp->count == 0)) | |
465 | err = grp->close(port->private_data, info); | |
466 | if (send_ack && client->type == USER_CLIENT) | |
467 | snd_seq_client_notify_subscription(port->addr.client, port->addr.port, | |
468 | info, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); | |
469 | module_put(port->owner); | |
470 | return err; | |
471 | } | |
472 | ||
473 | ||
474 | ||
475 | /* check if both addresses are identical */ | |
c7e0b5bf | 476 | static inline int addr_match(struct snd_seq_addr *r, struct snd_seq_addr *s) |
1da177e4 LT |
477 | { |
478 | return (r->client == s->client) && (r->port == s->port); | |
479 | } | |
480 | ||
481 | /* check the two subscribe info match */ | |
482 | /* if flags is zero, checks only sender and destination addresses */ | |
c7e0b5bf TI |
483 | static int match_subs_info(struct snd_seq_port_subscribe *r, |
484 | struct snd_seq_port_subscribe *s) | |
1da177e4 LT |
485 | { |
486 | if (addr_match(&r->sender, &s->sender) && | |
487 | addr_match(&r->dest, &s->dest)) { | |
488 | if (r->flags && r->flags == s->flags) | |
489 | return r->queue == s->queue; | |
490 | else if (! r->flags) | |
491 | return 1; | |
492 | } | |
493 | return 0; | |
494 | } | |
495 | ||
496 | ||
497 | /* connect two ports */ | |
c7e0b5bf TI |
498 | int snd_seq_port_connect(struct snd_seq_client *connector, |
499 | struct snd_seq_client *src_client, | |
500 | struct snd_seq_client_port *src_port, | |
501 | struct snd_seq_client *dest_client, | |
502 | struct snd_seq_client_port *dest_port, | |
503 | struct snd_seq_port_subscribe *info) | |
1da177e4 | 504 | { |
c7e0b5bf TI |
505 | struct snd_seq_port_subs_info *src = &src_port->c_src; |
506 | struct snd_seq_port_subs_info *dest = &dest_port->c_dest; | |
507 | struct snd_seq_subscribers *subs; | |
1da177e4 LT |
508 | struct list_head *p; |
509 | int err, src_called = 0; | |
510 | unsigned long flags; | |
511 | int exclusive; | |
512 | ||
ecca82b4 | 513 | subs = kzalloc(sizeof(*subs), GFP_KERNEL); |
1da177e4 LT |
514 | if (! subs) |
515 | return -ENOMEM; | |
516 | ||
517 | subs->info = *info; | |
518 | atomic_set(&subs->ref_count, 2); | |
519 | ||
520 | down_write(&src->list_mutex); | |
521 | down_write(&dest->list_mutex); | |
522 | ||
523 | exclusive = info->flags & SNDRV_SEQ_PORT_SUBS_EXCLUSIVE ? 1 : 0; | |
524 | err = -EBUSY; | |
525 | if (exclusive) { | |
526 | if (! list_empty(&src->list_head) || ! list_empty(&dest->list_head)) | |
527 | goto __error; | |
528 | } else { | |
529 | if (src->exclusive || dest->exclusive) | |
530 | goto __error; | |
531 | /* check whether already exists */ | |
532 | list_for_each(p, &src->list_head) { | |
c7e0b5bf | 533 | struct snd_seq_subscribers *s = list_entry(p, struct snd_seq_subscribers, src_list); |
1da177e4 LT |
534 | if (match_subs_info(info, &s->info)) |
535 | goto __error; | |
536 | } | |
537 | list_for_each(p, &dest->list_head) { | |
c7e0b5bf | 538 | struct snd_seq_subscribers *s = list_entry(p, struct snd_seq_subscribers, dest_list); |
1da177e4 LT |
539 | if (match_subs_info(info, &s->info)) |
540 | goto __error; | |
541 | } | |
542 | } | |
543 | ||
544 | if ((err = subscribe_port(src_client, src_port, src, info, | |
545 | connector->number != src_client->number)) < 0) | |
546 | goto __error; | |
547 | src_called = 1; | |
548 | ||
549 | if ((err = subscribe_port(dest_client, dest_port, dest, info, | |
550 | connector->number != dest_client->number)) < 0) | |
551 | goto __error; | |
552 | ||
553 | /* add to list */ | |
554 | write_lock_irqsave(&src->list_lock, flags); | |
555 | // write_lock(&dest->list_lock); // no other lock yet | |
556 | list_add_tail(&subs->src_list, &src->list_head); | |
557 | list_add_tail(&subs->dest_list, &dest->list_head); | |
558 | // write_unlock(&dest->list_lock); // no other lock yet | |
559 | write_unlock_irqrestore(&src->list_lock, flags); | |
560 | ||
561 | src->exclusive = dest->exclusive = exclusive; | |
562 | ||
563 | up_write(&dest->list_mutex); | |
564 | up_write(&src->list_mutex); | |
565 | return 0; | |
566 | ||
567 | __error: | |
568 | if (src_called) | |
569 | unsubscribe_port(src_client, src_port, src, info, | |
570 | connector->number != src_client->number); | |
571 | kfree(subs); | |
572 | up_write(&dest->list_mutex); | |
573 | up_write(&src->list_mutex); | |
574 | return err; | |
575 | } | |
576 | ||
577 | ||
578 | /* remove the connection */ | |
c7e0b5bf TI |
579 | int snd_seq_port_disconnect(struct snd_seq_client *connector, |
580 | struct snd_seq_client *src_client, | |
581 | struct snd_seq_client_port *src_port, | |
582 | struct snd_seq_client *dest_client, | |
583 | struct snd_seq_client_port *dest_port, | |
584 | struct snd_seq_port_subscribe *info) | |
1da177e4 | 585 | { |
c7e0b5bf TI |
586 | struct snd_seq_port_subs_info *src = &src_port->c_src; |
587 | struct snd_seq_port_subs_info *dest = &dest_port->c_dest; | |
588 | struct snd_seq_subscribers *subs; | |
1da177e4 LT |
589 | struct list_head *p; |
590 | int err = -ENOENT; | |
591 | unsigned long flags; | |
592 | ||
593 | down_write(&src->list_mutex); | |
594 | down_write(&dest->list_mutex); | |
595 | ||
596 | /* look for the connection */ | |
597 | list_for_each(p, &src->list_head) { | |
c7e0b5bf | 598 | subs = list_entry(p, struct snd_seq_subscribers, src_list); |
1da177e4 LT |
599 | if (match_subs_info(info, &subs->info)) { |
600 | write_lock_irqsave(&src->list_lock, flags); | |
601 | // write_lock(&dest->list_lock); // no lock yet | |
602 | list_del(&subs->src_list); | |
603 | list_del(&subs->dest_list); | |
604 | // write_unlock(&dest->list_lock); | |
605 | write_unlock_irqrestore(&src->list_lock, flags); | |
606 | src->exclusive = dest->exclusive = 0; | |
607 | unsubscribe_port(src_client, src_port, src, info, | |
608 | connector->number != src_client->number); | |
609 | unsubscribe_port(dest_client, dest_port, dest, info, | |
610 | connector->number != dest_client->number); | |
611 | kfree(subs); | |
612 | err = 0; | |
613 | break; | |
614 | } | |
615 | } | |
616 | ||
617 | up_write(&dest->list_mutex); | |
618 | up_write(&src->list_mutex); | |
619 | return err; | |
620 | } | |
621 | ||
622 | ||
623 | /* get matched subscriber */ | |
c7e0b5bf TI |
624 | struct snd_seq_subscribers *snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp, |
625 | struct snd_seq_addr *dest_addr) | |
1da177e4 LT |
626 | { |
627 | struct list_head *p; | |
c7e0b5bf | 628 | struct snd_seq_subscribers *s, *found = NULL; |
1da177e4 LT |
629 | |
630 | down_read(&src_grp->list_mutex); | |
631 | list_for_each(p, &src_grp->list_head) { | |
c7e0b5bf | 632 | s = list_entry(p, struct snd_seq_subscribers, src_list); |
1da177e4 LT |
633 | if (addr_match(dest_addr, &s->info.dest)) { |
634 | found = s; | |
635 | break; | |
636 | } | |
637 | } | |
638 | up_read(&src_grp->list_mutex); | |
639 | return found; | |
640 | } | |
641 | ||
642 | /* | |
643 | * Attach a device driver that wants to receive events from the | |
644 | * sequencer. Returns the new port number on success. | |
645 | * A driver that wants to receive the events converted to midi, will | |
646 | * use snd_seq_midisynth_register_port(). | |
647 | */ | |
648 | /* exported */ | |
649 | int snd_seq_event_port_attach(int client, | |
c7e0b5bf | 650 | struct snd_seq_port_callback *pcbp, |
1da177e4 LT |
651 | int cap, int type, int midi_channels, |
652 | int midi_voices, char *portname) | |
653 | { | |
c7e0b5bf | 654 | struct snd_seq_port_info portinfo; |
1da177e4 LT |
655 | int ret; |
656 | ||
657 | /* Set up the port */ | |
658 | memset(&portinfo, 0, sizeof(portinfo)); | |
659 | portinfo.addr.client = client; | |
660 | strlcpy(portinfo.name, portname ? portname : "Unamed port", | |
661 | sizeof(portinfo.name)); | |
662 | ||
663 | portinfo.capability = cap; | |
664 | portinfo.type = type; | |
665 | portinfo.kernel = pcbp; | |
666 | portinfo.midi_channels = midi_channels; | |
667 | portinfo.midi_voices = midi_voices; | |
668 | ||
669 | /* Create it */ | |
670 | ret = snd_seq_kernel_client_ctl(client, | |
671 | SNDRV_SEQ_IOCTL_CREATE_PORT, | |
672 | &portinfo); | |
673 | ||
674 | if (ret >= 0) | |
675 | ret = portinfo.addr.port; | |
676 | ||
677 | return ret; | |
678 | } | |
679 | ||
680 | ||
681 | /* | |
682 | * Detach the driver from a port. | |
683 | */ | |
684 | /* exported */ | |
685 | int snd_seq_event_port_detach(int client, int port) | |
686 | { | |
c7e0b5bf | 687 | struct snd_seq_port_info portinfo; |
1da177e4 LT |
688 | int err; |
689 | ||
690 | memset(&portinfo, 0, sizeof(portinfo)); | |
691 | portinfo.addr.client = client; | |
692 | portinfo.addr.port = port; | |
693 | err = snd_seq_kernel_client_ctl(client, | |
694 | SNDRV_SEQ_IOCTL_DELETE_PORT, | |
695 | &portinfo); | |
696 | ||
697 | return err; | |
698 | } |