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 | ||
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 | 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 */ | |
134 | snd_assert(client, return NULL); | |
135 | ||
136 | if (client->num_ports >= SNDRV_SEQ_MAX_PORTS - 1) { | |
137 | snd_printk(KERN_WARNING "too many ports for client %d\n", client->number); | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | /* create a new port */ | |
ecca82b4 | 142 | new_port = kzalloc(sizeof(*new_port), GFP_KERNEL); |
1da177e4 LT |
143 | if (! new_port) { |
144 | snd_printd("malloc failed for registering client port\n"); | |
145 | return NULL; /* failure, out of memory */ | |
146 | } | |
147 | /* init port data */ | |
148 | new_port->addr.client = client->number; | |
149 | new_port->addr.port = -1; | |
150 | new_port->owner = THIS_MODULE; | |
151 | sprintf(new_port->name, "port-%d", num); | |
152 | snd_use_lock_init(&new_port->use_lock); | |
153 | port_subs_info_init(&new_port->c_src); | |
154 | port_subs_info_init(&new_port->c_dest); | |
155 | ||
156 | num = port >= 0 ? port : 0; | |
1a60d4c5 | 157 | mutex_lock(&client->ports_mutex); |
1da177e4 | 158 | write_lock_irqsave(&client->ports_lock, flags); |
9244b2c3 | 159 | list_for_each_entry(p, &client->ports_list_head, list) { |
1da177e4 LT |
160 | if (p->addr.port > num) |
161 | break; | |
162 | if (port < 0) /* auto-probe mode */ | |
163 | num = p->addr.port + 1; | |
164 | } | |
165 | /* insert the new port */ | |
9244b2c3 | 166 | list_add_tail(&new_port->list, &p->list); |
1da177e4 LT |
167 | client->num_ports++; |
168 | new_port->addr.port = num; /* store the port number in the port */ | |
169 | write_unlock_irqrestore(&client->ports_lock, flags); | |
1a60d4c5 | 170 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
171 | sprintf(new_port->name, "port-%d", num); |
172 | ||
173 | return new_port; | |
174 | } | |
175 | ||
176 | /* */ | |
c7e0b5bf | 177 | enum group_type { |
1da177e4 LT |
178 | SRC_LIST, DEST_LIST |
179 | }; | |
180 | ||
c7e0b5bf TI |
181 | static int subscribe_port(struct snd_seq_client *client, |
182 | struct snd_seq_client_port *port, | |
183 | struct snd_seq_port_subs_info *grp, | |
184 | struct snd_seq_port_subscribe *info, int send_ack); | |
185 | static int unsubscribe_port(struct snd_seq_client *client, | |
186 | struct snd_seq_client_port *port, | |
187 | struct snd_seq_port_subs_info *grp, | |
188 | struct snd_seq_port_subscribe *info, int send_ack); | |
1da177e4 LT |
189 | |
190 | ||
c7e0b5bf TI |
191 | static struct snd_seq_client_port *get_client_port(struct snd_seq_addr *addr, |
192 | struct snd_seq_client **cp) | |
1da177e4 | 193 | { |
c7e0b5bf | 194 | struct snd_seq_client_port *p; |
1da177e4 LT |
195 | *cp = snd_seq_client_use_ptr(addr->client); |
196 | if (*cp) { | |
197 | p = snd_seq_port_use_ptr(*cp, addr->port); | |
198 | if (! p) { | |
199 | snd_seq_client_unlock(*cp); | |
200 | *cp = NULL; | |
201 | } | |
202 | return p; | |
203 | } | |
204 | return NULL; | |
205 | } | |
206 | ||
207 | /* | |
208 | * remove all subscribers on the list | |
209 | * this is called from port_delete, for each src and dest list. | |
210 | */ | |
c7e0b5bf TI |
211 | static void clear_subscriber_list(struct snd_seq_client *client, |
212 | struct snd_seq_client_port *port, | |
213 | struct snd_seq_port_subs_info *grp, | |
214 | int grptype) | |
1da177e4 LT |
215 | { |
216 | struct list_head *p, *n; | |
217 | ||
1da177e4 | 218 | list_for_each_safe(p, n, &grp->list_head) { |
c7e0b5bf TI |
219 | struct snd_seq_subscribers *subs; |
220 | struct snd_seq_client *c; | |
221 | struct snd_seq_client_port *aport; | |
1da177e4 LT |
222 | |
223 | if (grptype == SRC_LIST) { | |
c7e0b5bf | 224 | subs = list_entry(p, struct snd_seq_subscribers, src_list); |
1da177e4 LT |
225 | aport = get_client_port(&subs->info.dest, &c); |
226 | } else { | |
c7e0b5bf | 227 | subs = list_entry(p, struct snd_seq_subscribers, dest_list); |
1da177e4 LT |
228 | aport = get_client_port(&subs->info.sender, &c); |
229 | } | |
230 | list_del(p); | |
231 | unsubscribe_port(client, port, grp, &subs->info, 0); | |
232 | if (!aport) { | |
233 | /* looks like the connected port is being deleted. | |
234 | * we decrease the counter, and when both ports are deleted | |
235 | * remove the subscriber info | |
236 | */ | |
237 | if (atomic_dec_and_test(&subs->ref_count)) | |
238 | kfree(subs); | |
239 | } else { | |
240 | /* ok we got the connected port */ | |
c7e0b5bf | 241 | struct snd_seq_port_subs_info *agrp; |
1da177e4 LT |
242 | agrp = (grptype == SRC_LIST) ? &aport->c_dest : &aport->c_src; |
243 | down_write(&agrp->list_mutex); | |
244 | if (grptype == SRC_LIST) | |
245 | list_del(&subs->dest_list); | |
246 | else | |
247 | list_del(&subs->src_list); | |
6116ea07 | 248 | up_write(&agrp->list_mutex); |
1da177e4 LT |
249 | unsubscribe_port(c, aport, agrp, &subs->info, 1); |
250 | kfree(subs); | |
1da177e4 LT |
251 | snd_seq_port_unlock(aport); |
252 | snd_seq_client_unlock(c); | |
253 | } | |
254 | } | |
1da177e4 LT |
255 | } |
256 | ||
257 | /* delete port data */ | |
c7e0b5bf TI |
258 | static int port_delete(struct snd_seq_client *client, |
259 | struct snd_seq_client_port *port) | |
1da177e4 LT |
260 | { |
261 | /* set closing flag and wait for all port access are gone */ | |
262 | port->closing = 1; | |
263 | snd_use_lock_sync(&port->use_lock); | |
264 | ||
265 | /* clear subscribers info */ | |
266 | clear_subscriber_list(client, port, &port->c_src, SRC_LIST); | |
267 | clear_subscriber_list(client, port, &port->c_dest, DEST_LIST); | |
268 | ||
269 | if (port->private_free) | |
270 | port->private_free(port->private_data); | |
271 | ||
272 | snd_assert(port->c_src.count == 0,); | |
273 | snd_assert(port->c_dest.count == 0,); | |
274 | ||
275 | kfree(port); | |
276 | return 0; | |
277 | } | |
278 | ||
279 | ||
280 | /* delete a port with the given port id */ | |
c7e0b5bf | 281 | int snd_seq_delete_port(struct snd_seq_client *client, int port) |
1da177e4 LT |
282 | { |
283 | unsigned long flags; | |
9244b2c3 | 284 | struct snd_seq_client_port *found = NULL, *p; |
1da177e4 | 285 | |
1a60d4c5 | 286 | mutex_lock(&client->ports_mutex); |
1da177e4 | 287 | write_lock_irqsave(&client->ports_lock, flags); |
9244b2c3 | 288 | list_for_each_entry(p, &client->ports_list_head, list) { |
1da177e4 LT |
289 | if (p->addr.port == port) { |
290 | /* ok found. delete from the list at first */ | |
9244b2c3 | 291 | list_del(&p->list); |
1da177e4 LT |
292 | client->num_ports--; |
293 | found = p; | |
294 | break; | |
295 | } | |
296 | } | |
297 | write_unlock_irqrestore(&client->ports_lock, flags); | |
1a60d4c5 | 298 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
299 | if (found) |
300 | return port_delete(client, found); | |
301 | else | |
302 | return -ENOENT; | |
303 | } | |
304 | ||
305 | /* delete the all ports belonging to the given client */ | |
c7e0b5bf | 306 | int snd_seq_delete_all_ports(struct snd_seq_client *client) |
1da177e4 LT |
307 | { |
308 | unsigned long flags; | |
9244b2c3 JB |
309 | struct list_head deleted_list; |
310 | struct snd_seq_client_port *port, *tmp; | |
1da177e4 LT |
311 | |
312 | /* move the port list to deleted_list, and | |
313 | * clear the port list in the client data. | |
314 | */ | |
1a60d4c5 | 315 | mutex_lock(&client->ports_mutex); |
1da177e4 LT |
316 | write_lock_irqsave(&client->ports_lock, flags); |
317 | if (! list_empty(&client->ports_list_head)) { | |
be7ee278 TI |
318 | list_add(&deleted_list, &client->ports_list_head); |
319 | list_del_init(&client->ports_list_head); | |
1da177e4 LT |
320 | } else { |
321 | INIT_LIST_HEAD(&deleted_list); | |
322 | } | |
323 | client->num_ports = 0; | |
324 | write_unlock_irqrestore(&client->ports_lock, flags); | |
325 | ||
326 | /* remove each port in deleted_list */ | |
9244b2c3 JB |
327 | list_for_each_entry_safe(port, tmp, &deleted_list, list) { |
328 | list_del(&port->list); | |
1da177e4 LT |
329 | snd_seq_system_client_ev_port_exit(port->addr.client, port->addr.port); |
330 | port_delete(client, port); | |
331 | } | |
1a60d4c5 | 332 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
333 | return 0; |
334 | } | |
335 | ||
336 | /* set port info fields */ | |
c7e0b5bf TI |
337 | int snd_seq_set_port_info(struct snd_seq_client_port * port, |
338 | struct snd_seq_port_info * info) | |
1da177e4 LT |
339 | { |
340 | snd_assert(port && info, return -EINVAL); | |
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 LT |
368 | { |
369 | snd_assert(port && info, return -EINVAL); | |
370 | ||
371 | /* get port name */ | |
372 | strlcpy(info->name, port->name, sizeof(info->name)); | |
373 | ||
374 | /* get capabilities */ | |
375 | info->capability = port->capability; | |
376 | ||
377 | /* get port type */ | |
378 | info->type = port->type; | |
379 | ||
380 | /* information about supported channels/voices */ | |
381 | info->midi_channels = port->midi_channels; | |
382 | info->midi_voices = port->midi_voices; | |
383 | info->synth_voices = port->synth_voices; | |
384 | ||
385 | /* get subscriber counts */ | |
386 | info->read_use = port->c_src.count; | |
387 | info->write_use = port->c_dest.count; | |
388 | ||
389 | /* timestamping */ | |
390 | info->flags = 0; | |
391 | if (port->timestamping) { | |
392 | info->flags |= SNDRV_SEQ_PORT_FLG_TIMESTAMP; | |
393 | if (port->time_real) | |
394 | info->flags |= SNDRV_SEQ_PORT_FLG_TIME_REAL; | |
395 | info->time_queue = port->time_queue; | |
396 | } | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | ||
402 | ||
403 | /* | |
404 | * call callback functions (if any): | |
405 | * the callbacks are invoked only when the first (for connection) or | |
406 | * the last subscription (for disconnection) is done. Second or later | |
407 | * subscription results in increment of counter, but no callback is | |
408 | * invoked. | |
409 | * This feature is useful if these callbacks are associated with | |
410 | * initialization or termination of devices (see seq_midi.c). | |
411 | * | |
412 | * If callback_all option is set, the callback function is invoked | |
413 | * at each connnection/disconnection. | |
414 | */ | |
415 | ||
c7e0b5bf TI |
416 | static int subscribe_port(struct snd_seq_client *client, |
417 | struct snd_seq_client_port *port, | |
418 | struct snd_seq_port_subs_info *grp, | |
419 | struct snd_seq_port_subscribe *info, | |
420 | int send_ack) | |
1da177e4 LT |
421 | { |
422 | int err = 0; | |
423 | ||
424 | if (!try_module_get(port->owner)) | |
425 | return -EFAULT; | |
426 | grp->count++; | |
427 | if (grp->open && (port->callback_all || grp->count == 1)) { | |
428 | err = grp->open(port->private_data, info); | |
429 | if (err < 0) { | |
430 | module_put(port->owner); | |
431 | grp->count--; | |
432 | } | |
433 | } | |
434 | if (err >= 0 && send_ack && client->type == USER_CLIENT) | |
435 | snd_seq_client_notify_subscription(port->addr.client, port->addr.port, | |
436 | info, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); | |
437 | ||
438 | return err; | |
439 | } | |
440 | ||
c7e0b5bf TI |
441 | static int unsubscribe_port(struct snd_seq_client *client, |
442 | struct snd_seq_client_port *port, | |
443 | struct snd_seq_port_subs_info *grp, | |
444 | struct snd_seq_port_subscribe *info, | |
445 | int send_ack) | |
1da177e4 LT |
446 | { |
447 | int err = 0; | |
448 | ||
449 | if (! grp->count) | |
450 | return -EINVAL; | |
451 | grp->count--; | |
452 | if (grp->close && (port->callback_all || grp->count == 0)) | |
453 | err = grp->close(port->private_data, info); | |
454 | if (send_ack && client->type == USER_CLIENT) | |
455 | snd_seq_client_notify_subscription(port->addr.client, port->addr.port, | |
456 | info, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); | |
457 | module_put(port->owner); | |
458 | return err; | |
459 | } | |
460 | ||
461 | ||
462 | ||
463 | /* check if both addresses are identical */ | |
c7e0b5bf | 464 | static inline int addr_match(struct snd_seq_addr *r, struct snd_seq_addr *s) |
1da177e4 LT |
465 | { |
466 | return (r->client == s->client) && (r->port == s->port); | |
467 | } | |
468 | ||
469 | /* check the two subscribe info match */ | |
470 | /* if flags is zero, checks only sender and destination addresses */ | |
c7e0b5bf TI |
471 | static int match_subs_info(struct snd_seq_port_subscribe *r, |
472 | struct snd_seq_port_subscribe *s) | |
1da177e4 LT |
473 | { |
474 | if (addr_match(&r->sender, &s->sender) && | |
475 | addr_match(&r->dest, &s->dest)) { | |
476 | if (r->flags && r->flags == s->flags) | |
477 | return r->queue == s->queue; | |
478 | else if (! r->flags) | |
479 | return 1; | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
484 | ||
485 | /* connect two ports */ | |
c7e0b5bf TI |
486 | int snd_seq_port_connect(struct snd_seq_client *connector, |
487 | struct snd_seq_client *src_client, | |
488 | struct snd_seq_client_port *src_port, | |
489 | struct snd_seq_client *dest_client, | |
490 | struct snd_seq_client_port *dest_port, | |
491 | struct snd_seq_port_subscribe *info) | |
1da177e4 | 492 | { |
c7e0b5bf TI |
493 | struct snd_seq_port_subs_info *src = &src_port->c_src; |
494 | struct snd_seq_port_subs_info *dest = &dest_port->c_dest; | |
9244b2c3 | 495 | struct snd_seq_subscribers *subs, *s; |
1da177e4 LT |
496 | int err, src_called = 0; |
497 | unsigned long flags; | |
498 | int exclusive; | |
499 | ||
ecca82b4 | 500 | subs = kzalloc(sizeof(*subs), GFP_KERNEL); |
1da177e4 LT |
501 | if (! subs) |
502 | return -ENOMEM; | |
503 | ||
504 | subs->info = *info; | |
505 | atomic_set(&subs->ref_count, 2); | |
506 | ||
507 | down_write(&src->list_mutex); | |
d8371f04 | 508 | down_write_nested(&dest->list_mutex, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
509 | |
510 | exclusive = info->flags & SNDRV_SEQ_PORT_SUBS_EXCLUSIVE ? 1 : 0; | |
511 | err = -EBUSY; | |
512 | if (exclusive) { | |
513 | if (! list_empty(&src->list_head) || ! list_empty(&dest->list_head)) | |
514 | goto __error; | |
515 | } else { | |
516 | if (src->exclusive || dest->exclusive) | |
517 | goto __error; | |
518 | /* check whether already exists */ | |
9244b2c3 | 519 | list_for_each_entry(s, &src->list_head, src_list) { |
1da177e4 LT |
520 | if (match_subs_info(info, &s->info)) |
521 | goto __error; | |
522 | } | |
9244b2c3 | 523 | list_for_each_entry(s, &dest->list_head, dest_list) { |
1da177e4 LT |
524 | if (match_subs_info(info, &s->info)) |
525 | goto __error; | |
526 | } | |
527 | } | |
528 | ||
529 | if ((err = subscribe_port(src_client, src_port, src, info, | |
530 | connector->number != src_client->number)) < 0) | |
531 | goto __error; | |
532 | src_called = 1; | |
533 | ||
534 | if ((err = subscribe_port(dest_client, dest_port, dest, info, | |
535 | connector->number != dest_client->number)) < 0) | |
536 | goto __error; | |
537 | ||
538 | /* add to list */ | |
539 | write_lock_irqsave(&src->list_lock, flags); | |
540 | // write_lock(&dest->list_lock); // no other lock yet | |
541 | list_add_tail(&subs->src_list, &src->list_head); | |
542 | list_add_tail(&subs->dest_list, &dest->list_head); | |
543 | // write_unlock(&dest->list_lock); // no other lock yet | |
544 | write_unlock_irqrestore(&src->list_lock, flags); | |
545 | ||
546 | src->exclusive = dest->exclusive = exclusive; | |
547 | ||
548 | up_write(&dest->list_mutex); | |
549 | up_write(&src->list_mutex); | |
550 | return 0; | |
551 | ||
552 | __error: | |
553 | if (src_called) | |
554 | unsubscribe_port(src_client, src_port, src, info, | |
555 | connector->number != src_client->number); | |
556 | kfree(subs); | |
557 | up_write(&dest->list_mutex); | |
558 | up_write(&src->list_mutex); | |
559 | return err; | |
560 | } | |
561 | ||
562 | ||
563 | /* remove the connection */ | |
c7e0b5bf TI |
564 | int snd_seq_port_disconnect(struct snd_seq_client *connector, |
565 | struct snd_seq_client *src_client, | |
566 | struct snd_seq_client_port *src_port, | |
567 | struct snd_seq_client *dest_client, | |
568 | struct snd_seq_client_port *dest_port, | |
569 | struct snd_seq_port_subscribe *info) | |
1da177e4 | 570 | { |
c7e0b5bf TI |
571 | struct snd_seq_port_subs_info *src = &src_port->c_src; |
572 | struct snd_seq_port_subs_info *dest = &dest_port->c_dest; | |
573 | struct snd_seq_subscribers *subs; | |
1da177e4 LT |
574 | int err = -ENOENT; |
575 | unsigned long flags; | |
576 | ||
577 | down_write(&src->list_mutex); | |
d8371f04 | 578 | down_write_nested(&dest->list_mutex, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
579 | |
580 | /* look for the connection */ | |
9244b2c3 | 581 | list_for_each_entry(subs, &src->list_head, src_list) { |
1da177e4 LT |
582 | if (match_subs_info(info, &subs->info)) { |
583 | write_lock_irqsave(&src->list_lock, flags); | |
584 | // write_lock(&dest->list_lock); // no lock yet | |
585 | list_del(&subs->src_list); | |
586 | list_del(&subs->dest_list); | |
587 | // write_unlock(&dest->list_lock); | |
588 | write_unlock_irqrestore(&src->list_lock, flags); | |
589 | src->exclusive = dest->exclusive = 0; | |
590 | unsubscribe_port(src_client, src_port, src, info, | |
591 | connector->number != src_client->number); | |
592 | unsubscribe_port(dest_client, dest_port, dest, info, | |
593 | connector->number != dest_client->number); | |
594 | kfree(subs); | |
595 | err = 0; | |
596 | break; | |
597 | } | |
598 | } | |
599 | ||
600 | up_write(&dest->list_mutex); | |
601 | up_write(&src->list_mutex); | |
602 | return err; | |
603 | } | |
604 | ||
605 | ||
606 | /* get matched subscriber */ | |
c7e0b5bf TI |
607 | struct snd_seq_subscribers *snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp, |
608 | struct snd_seq_addr *dest_addr) | |
1da177e4 | 609 | { |
c7e0b5bf | 610 | struct snd_seq_subscribers *s, *found = NULL; |
1da177e4 LT |
611 | |
612 | down_read(&src_grp->list_mutex); | |
9244b2c3 | 613 | list_for_each_entry(s, &src_grp->list_head, src_list) { |
1da177e4 LT |
614 | if (addr_match(dest_addr, &s->info.dest)) { |
615 | found = s; | |
616 | break; | |
617 | } | |
618 | } | |
619 | up_read(&src_grp->list_mutex); | |
620 | return found; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Attach a device driver that wants to receive events from the | |
625 | * sequencer. Returns the new port number on success. | |
626 | * A driver that wants to receive the events converted to midi, will | |
627 | * use snd_seq_midisynth_register_port(). | |
628 | */ | |
629 | /* exported */ | |
630 | int snd_seq_event_port_attach(int client, | |
c7e0b5bf | 631 | struct snd_seq_port_callback *pcbp, |
1da177e4 LT |
632 | int cap, int type, int midi_channels, |
633 | int midi_voices, char *portname) | |
634 | { | |
c7e0b5bf | 635 | struct snd_seq_port_info portinfo; |
1da177e4 LT |
636 | int ret; |
637 | ||
638 | /* Set up the port */ | |
639 | memset(&portinfo, 0, sizeof(portinfo)); | |
640 | portinfo.addr.client = client; | |
641 | strlcpy(portinfo.name, portname ? portname : "Unamed port", | |
642 | sizeof(portinfo.name)); | |
643 | ||
644 | portinfo.capability = cap; | |
645 | portinfo.type = type; | |
646 | portinfo.kernel = pcbp; | |
647 | portinfo.midi_channels = midi_channels; | |
648 | portinfo.midi_voices = midi_voices; | |
649 | ||
650 | /* Create it */ | |
651 | ret = snd_seq_kernel_client_ctl(client, | |
652 | SNDRV_SEQ_IOCTL_CREATE_PORT, | |
653 | &portinfo); | |
654 | ||
655 | if (ret >= 0) | |
656 | ret = portinfo.addr.port; | |
657 | ||
658 | return ret; | |
659 | } | |
660 | ||
91715ed9 | 661 | EXPORT_SYMBOL(snd_seq_event_port_attach); |
1da177e4 LT |
662 | |
663 | /* | |
664 | * Detach the driver from a port. | |
665 | */ | |
666 | /* exported */ | |
667 | int snd_seq_event_port_detach(int client, int port) | |
668 | { | |
c7e0b5bf | 669 | struct snd_seq_port_info portinfo; |
1da177e4 LT |
670 | int err; |
671 | ||
672 | memset(&portinfo, 0, sizeof(portinfo)); | |
673 | portinfo.addr.client = client; | |
674 | portinfo.addr.port = port; | |
675 | err = snd_seq_kernel_client_ctl(client, | |
676 | SNDRV_SEQ_IOCTL_DELETE_PORT, | |
677 | &portinfo); | |
678 | ||
679 | return err; | |
680 | } | |
91715ed9 TI |
681 | |
682 | EXPORT_SYMBOL(snd_seq_event_port_detach); |