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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * ALSA sequencer Ports | |
4 | * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl> | |
c1017a4c | 5 | * Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
6 | */ |
7 | ||
1da177e4 LT |
8 | #include <sound/core.h> |
9 | #include <linux/slab.h> | |
da155d5b | 10 | #include <linux/module.h> |
1da177e4 LT |
11 | #include "seq_system.h" |
12 | #include "seq_ports.h" | |
13 | #include "seq_clientmgr.h" | |
14 | ||
15 | /* | |
16 | ||
17 | registration of client ports | |
18 | ||
19 | */ | |
20 | ||
21 | ||
22 | /* | |
23 | ||
24 | NOTE: the current implementation of the port structure as a linked list is | |
25 | not optimal for clients that have many ports. For sending messages to all | |
26 | subscribers of a port we first need to find the address of the port | |
27 | structure, which means we have to traverse the list. A direct access table | |
28 | (array) would be better, but big preallocated arrays waste memory. | |
29 | ||
30 | Possible actions: | |
31 | ||
32 | 1) leave it this way, a client does normaly does not have more than a few | |
33 | ports | |
34 | ||
35 | 2) replace the linked list of ports by a array of pointers which is | |
36 | dynamicly kmalloced. When a port is added or deleted we can simply allocate | |
37 | a new array, copy the corresponding pointers, and delete the old one. We | |
38 | then only need a pointer to this array, and an integer that tells us how | |
39 | much elements are in array. | |
40 | ||
41 | */ | |
42 | ||
43 | /* return pointer to port structure - port is locked if found */ | |
c7e0b5bf TI |
44 | struct snd_seq_client_port *snd_seq_port_use_ptr(struct snd_seq_client *client, |
45 | int num) | |
1da177e4 | 46 | { |
c7e0b5bf | 47 | struct snd_seq_client_port *port; |
1da177e4 LT |
48 | |
49 | if (client == NULL) | |
50 | return NULL; | |
51 | read_lock(&client->ports_lock); | |
9244b2c3 | 52 | list_for_each_entry(port, &client->ports_list_head, list) { |
1da177e4 LT |
53 | if (port->addr.port == num) { |
54 | if (port->closing) | |
55 | break; /* deleting now */ | |
56 | snd_use_lock_use(&port->use_lock); | |
57 | read_unlock(&client->ports_lock); | |
58 | return port; | |
59 | } | |
60 | } | |
61 | read_unlock(&client->ports_lock); | |
62 | return NULL; /* not found */ | |
63 | } | |
64 | ||
65 | ||
66 | /* search for the next port - port is locked if found */ | |
c7e0b5bf TI |
67 | struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *client, |
68 | struct snd_seq_port_info *pinfo) | |
1da177e4 LT |
69 | { |
70 | int num; | |
c7e0b5bf | 71 | struct snd_seq_client_port *port, *found; |
1da177e4 LT |
72 | |
73 | num = pinfo->addr.port; | |
74 | found = NULL; | |
75 | read_lock(&client->ports_lock); | |
9244b2c3 | 76 | list_for_each_entry(port, &client->ports_list_head, list) { |
1da177e4 LT |
77 | if (port->addr.port < num) |
78 | continue; | |
79 | if (port->addr.port == num) { | |
80 | found = port; | |
81 | break; | |
82 | } | |
83 | if (found == NULL || port->addr.port < found->addr.port) | |
84 | found = port; | |
85 | } | |
86 | if (found) { | |
87 | if (found->closing) | |
88 | found = NULL; | |
89 | else | |
90 | snd_use_lock_use(&found->use_lock); | |
91 | } | |
92 | read_unlock(&client->ports_lock); | |
93 | return found; | |
94 | } | |
95 | ||
96 | ||
c7e0b5bf TI |
97 | /* initialize snd_seq_port_subs_info */ |
98 | static void port_subs_info_init(struct snd_seq_port_subs_info *grp) | |
1da177e4 LT |
99 | { |
100 | INIT_LIST_HEAD(&grp->list_head); | |
101 | grp->count = 0; | |
102 | grp->exclusive = 0; | |
103 | rwlock_init(&grp->list_lock); | |
104 | init_rwsem(&grp->list_mutex); | |
105 | grp->open = NULL; | |
106 | grp->close = NULL; | |
107 | } | |
108 | ||
109 | ||
71105998 TI |
110 | /* create a port, port number is returned (-1 on failure); |
111 | * the caller needs to unref the port via snd_seq_port_unlock() appropriately | |
112 | */ | |
c7e0b5bf TI |
113 | struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client, |
114 | int port) | |
1da177e4 | 115 | { |
9244b2c3 | 116 | struct snd_seq_client_port *new_port, *p; |
1da177e4 LT |
117 | int num = -1; |
118 | ||
119 | /* sanity check */ | |
7eaa943c TI |
120 | if (snd_BUG_ON(!client)) |
121 | return NULL; | |
1da177e4 | 122 | |
de20b572 | 123 | if (client->num_ports >= SNDRV_SEQ_MAX_PORTS) { |
04cc79a0 | 124 | pr_warn("ALSA: seq: too many ports for client %d\n", client->number); |
1da177e4 LT |
125 | return NULL; |
126 | } | |
127 | ||
128 | /* create a new port */ | |
ecca82b4 | 129 | new_port = kzalloc(sizeof(*new_port), GFP_KERNEL); |
24db8bba | 130 | if (!new_port) |
1da177e4 | 131 | return NULL; /* failure, out of memory */ |
1da177e4 LT |
132 | /* init port data */ |
133 | new_port->addr.client = client->number; | |
134 | new_port->addr.port = -1; | |
135 | new_port->owner = THIS_MODULE; | |
136 | sprintf(new_port->name, "port-%d", num); | |
137 | snd_use_lock_init(&new_port->use_lock); | |
138 | port_subs_info_init(&new_port->c_src); | |
139 | port_subs_info_init(&new_port->c_dest); | |
71105998 | 140 | snd_use_lock_use(&new_port->use_lock); |
1da177e4 LT |
141 | |
142 | num = port >= 0 ? port : 0; | |
1a60d4c5 | 143 | mutex_lock(&client->ports_mutex); |
f823b8a7 | 144 | write_lock_irq(&client->ports_lock); |
9244b2c3 | 145 | list_for_each_entry(p, &client->ports_list_head, list) { |
1da177e4 LT |
146 | if (p->addr.port > num) |
147 | break; | |
148 | if (port < 0) /* auto-probe mode */ | |
149 | num = p->addr.port + 1; | |
150 | } | |
151 | /* insert the new port */ | |
9244b2c3 | 152 | list_add_tail(&new_port->list, &p->list); |
1da177e4 LT |
153 | client->num_ports++; |
154 | new_port->addr.port = num; /* store the port number in the port */ | |
71105998 | 155 | sprintf(new_port->name, "port-%d", num); |
f823b8a7 | 156 | write_unlock_irq(&client->ports_lock); |
1a60d4c5 | 157 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
158 | |
159 | return new_port; | |
160 | } | |
161 | ||
162 | /* */ | |
c7e0b5bf TI |
163 | static int subscribe_port(struct snd_seq_client *client, |
164 | struct snd_seq_client_port *port, | |
165 | struct snd_seq_port_subs_info *grp, | |
166 | struct snd_seq_port_subscribe *info, int send_ack); | |
167 | static int unsubscribe_port(struct snd_seq_client *client, | |
168 | struct snd_seq_client_port *port, | |
169 | struct snd_seq_port_subs_info *grp, | |
170 | struct snd_seq_port_subscribe *info, int send_ack); | |
1da177e4 LT |
171 | |
172 | ||
c7e0b5bf TI |
173 | static struct snd_seq_client_port *get_client_port(struct snd_seq_addr *addr, |
174 | struct snd_seq_client **cp) | |
1da177e4 | 175 | { |
c7e0b5bf | 176 | struct snd_seq_client_port *p; |
1da177e4 LT |
177 | *cp = snd_seq_client_use_ptr(addr->client); |
178 | if (*cp) { | |
179 | p = snd_seq_port_use_ptr(*cp, addr->port); | |
180 | if (! p) { | |
181 | snd_seq_client_unlock(*cp); | |
182 | *cp = NULL; | |
183 | } | |
184 | return p; | |
185 | } | |
186 | return NULL; | |
187 | } | |
188 | ||
7f0973e9 TI |
189 | static void delete_and_unsubscribe_port(struct snd_seq_client *client, |
190 | struct snd_seq_client_port *port, | |
191 | struct snd_seq_subscribers *subs, | |
192 | bool is_src, bool ack); | |
193 | ||
194 | static inline struct snd_seq_subscribers * | |
195 | get_subscriber(struct list_head *p, bool is_src) | |
196 | { | |
197 | if (is_src) | |
198 | return list_entry(p, struct snd_seq_subscribers, src_list); | |
199 | else | |
200 | return list_entry(p, struct snd_seq_subscribers, dest_list); | |
201 | } | |
202 | ||
1da177e4 LT |
203 | /* |
204 | * remove all subscribers on the list | |
205 | * this is called from port_delete, for each src and dest list. | |
206 | */ | |
c7e0b5bf TI |
207 | static void clear_subscriber_list(struct snd_seq_client *client, |
208 | struct snd_seq_client_port *port, | |
209 | struct snd_seq_port_subs_info *grp, | |
7f0973e9 | 210 | int is_src) |
1da177e4 LT |
211 | { |
212 | struct list_head *p, *n; | |
213 | ||
1da177e4 | 214 | list_for_each_safe(p, n, &grp->list_head) { |
c7e0b5bf TI |
215 | struct snd_seq_subscribers *subs; |
216 | struct snd_seq_client *c; | |
217 | struct snd_seq_client_port *aport; | |
1da177e4 | 218 | |
7f0973e9 TI |
219 | subs = get_subscriber(p, is_src); |
220 | if (is_src) | |
1da177e4 | 221 | aport = get_client_port(&subs->info.dest, &c); |
7f0973e9 | 222 | else |
1da177e4 | 223 | aport = get_client_port(&subs->info.sender, &c); |
7f0973e9 TI |
224 | delete_and_unsubscribe_port(client, port, subs, is_src, false); |
225 | ||
1da177e4 LT |
226 | if (!aport) { |
227 | /* looks like the connected port is being deleted. | |
228 | * we decrease the counter, and when both ports are deleted | |
229 | * remove the subscriber info | |
230 | */ | |
231 | if (atomic_dec_and_test(&subs->ref_count)) | |
232 | kfree(subs); | |
7f0973e9 | 233 | continue; |
1da177e4 | 234 | } |
7f0973e9 TI |
235 | |
236 | /* ok we got the connected port */ | |
237 | delete_and_unsubscribe_port(c, aport, subs, !is_src, true); | |
238 | kfree(subs); | |
239 | snd_seq_port_unlock(aport); | |
240 | snd_seq_client_unlock(c); | |
1da177e4 | 241 | } |
1da177e4 LT |
242 | } |
243 | ||
244 | /* delete port data */ | |
c7e0b5bf TI |
245 | static int port_delete(struct snd_seq_client *client, |
246 | struct snd_seq_client_port *port) | |
1da177e4 LT |
247 | { |
248 | /* set closing flag and wait for all port access are gone */ | |
249 | port->closing = 1; | |
250 | snd_use_lock_sync(&port->use_lock); | |
251 | ||
252 | /* clear subscribers info */ | |
7f0973e9 TI |
253 | clear_subscriber_list(client, port, &port->c_src, true); |
254 | clear_subscriber_list(client, port, &port->c_dest, false); | |
1da177e4 LT |
255 | |
256 | if (port->private_free) | |
257 | port->private_free(port->private_data); | |
258 | ||
7eaa943c TI |
259 | snd_BUG_ON(port->c_src.count != 0); |
260 | snd_BUG_ON(port->c_dest.count != 0); | |
1da177e4 LT |
261 | |
262 | kfree(port); | |
263 | return 0; | |
264 | } | |
265 | ||
266 | ||
267 | /* delete a port with the given port id */ | |
c7e0b5bf | 268 | int snd_seq_delete_port(struct snd_seq_client *client, int port) |
1da177e4 | 269 | { |
9244b2c3 | 270 | struct snd_seq_client_port *found = NULL, *p; |
1da177e4 | 271 | |
1a60d4c5 | 272 | mutex_lock(&client->ports_mutex); |
f823b8a7 | 273 | write_lock_irq(&client->ports_lock); |
9244b2c3 | 274 | list_for_each_entry(p, &client->ports_list_head, list) { |
1da177e4 LT |
275 | if (p->addr.port == port) { |
276 | /* ok found. delete from the list at first */ | |
9244b2c3 | 277 | list_del(&p->list); |
1da177e4 LT |
278 | client->num_ports--; |
279 | found = p; | |
280 | break; | |
281 | } | |
282 | } | |
f823b8a7 | 283 | write_unlock_irq(&client->ports_lock); |
1a60d4c5 | 284 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
285 | if (found) |
286 | return port_delete(client, found); | |
287 | else | |
288 | return -ENOENT; | |
289 | } | |
290 | ||
291 | /* delete the all ports belonging to the given client */ | |
c7e0b5bf | 292 | int snd_seq_delete_all_ports(struct snd_seq_client *client) |
1da177e4 | 293 | { |
9244b2c3 JB |
294 | struct list_head deleted_list; |
295 | struct snd_seq_client_port *port, *tmp; | |
1da177e4 LT |
296 | |
297 | /* move the port list to deleted_list, and | |
298 | * clear the port list in the client data. | |
299 | */ | |
1a60d4c5 | 300 | mutex_lock(&client->ports_mutex); |
f823b8a7 | 301 | write_lock_irq(&client->ports_lock); |
1da177e4 | 302 | if (! list_empty(&client->ports_list_head)) { |
be7ee278 TI |
303 | list_add(&deleted_list, &client->ports_list_head); |
304 | list_del_init(&client->ports_list_head); | |
1da177e4 LT |
305 | } else { |
306 | INIT_LIST_HEAD(&deleted_list); | |
307 | } | |
308 | client->num_ports = 0; | |
f823b8a7 | 309 | write_unlock_irq(&client->ports_lock); |
1da177e4 LT |
310 | |
311 | /* remove each port in deleted_list */ | |
9244b2c3 JB |
312 | list_for_each_entry_safe(port, tmp, &deleted_list, list) { |
313 | list_del(&port->list); | |
1da177e4 LT |
314 | snd_seq_system_client_ev_port_exit(port->addr.client, port->addr.port); |
315 | port_delete(client, port); | |
316 | } | |
1a60d4c5 | 317 | mutex_unlock(&client->ports_mutex); |
1da177e4 LT |
318 | return 0; |
319 | } | |
320 | ||
321 | /* set port info fields */ | |
c7e0b5bf TI |
322 | int snd_seq_set_port_info(struct snd_seq_client_port * port, |
323 | struct snd_seq_port_info * info) | |
1da177e4 | 324 | { |
7eaa943c TI |
325 | if (snd_BUG_ON(!port || !info)) |
326 | return -EINVAL; | |
1da177e4 LT |
327 | |
328 | /* set port name */ | |
329 | if (info->name[0]) | |
330 | strlcpy(port->name, info->name, sizeof(port->name)); | |
331 | ||
332 | /* set capabilities */ | |
333 | port->capability = info->capability; | |
334 | ||
335 | /* get port type */ | |
336 | port->type = info->type; | |
337 | ||
338 | /* information about supported channels/voices */ | |
339 | port->midi_channels = info->midi_channels; | |
340 | port->midi_voices = info->midi_voices; | |
341 | port->synth_voices = info->synth_voices; | |
342 | ||
343 | /* timestamping */ | |
344 | port->timestamping = (info->flags & SNDRV_SEQ_PORT_FLG_TIMESTAMP) ? 1 : 0; | |
345 | port->time_real = (info->flags & SNDRV_SEQ_PORT_FLG_TIME_REAL) ? 1 : 0; | |
346 | port->time_queue = info->time_queue; | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | /* get port info fields */ | |
c7e0b5bf TI |
352 | int snd_seq_get_port_info(struct snd_seq_client_port * port, |
353 | struct snd_seq_port_info * info) | |
1da177e4 | 354 | { |
7eaa943c TI |
355 | if (snd_BUG_ON(!port || !info)) |
356 | return -EINVAL; | |
1da177e4 LT |
357 | |
358 | /* get port name */ | |
359 | strlcpy(info->name, port->name, sizeof(info->name)); | |
360 | ||
361 | /* get capabilities */ | |
362 | info->capability = port->capability; | |
363 | ||
364 | /* get port type */ | |
365 | info->type = port->type; | |
366 | ||
367 | /* information about supported channels/voices */ | |
368 | info->midi_channels = port->midi_channels; | |
369 | info->midi_voices = port->midi_voices; | |
370 | info->synth_voices = port->synth_voices; | |
371 | ||
372 | /* get subscriber counts */ | |
373 | info->read_use = port->c_src.count; | |
374 | info->write_use = port->c_dest.count; | |
375 | ||
376 | /* timestamping */ | |
377 | info->flags = 0; | |
378 | if (port->timestamping) { | |
379 | info->flags |= SNDRV_SEQ_PORT_FLG_TIMESTAMP; | |
380 | if (port->time_real) | |
381 | info->flags |= SNDRV_SEQ_PORT_FLG_TIME_REAL; | |
382 | info->time_queue = port->time_queue; | |
383 | } | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | ||
389 | ||
390 | /* | |
391 | * call callback functions (if any): | |
392 | * the callbacks are invoked only when the first (for connection) or | |
393 | * the last subscription (for disconnection) is done. Second or later | |
394 | * subscription results in increment of counter, but no callback is | |
395 | * invoked. | |
396 | * This feature is useful if these callbacks are associated with | |
397 | * initialization or termination of devices (see seq_midi.c). | |
1da177e4 LT |
398 | */ |
399 | ||
c7e0b5bf TI |
400 | static int subscribe_port(struct snd_seq_client *client, |
401 | struct snd_seq_client_port *port, | |
402 | struct snd_seq_port_subs_info *grp, | |
403 | struct snd_seq_port_subscribe *info, | |
404 | int send_ack) | |
1da177e4 LT |
405 | { |
406 | int err = 0; | |
407 | ||
408 | if (!try_module_get(port->owner)) | |
409 | return -EFAULT; | |
410 | grp->count++; | |
a55bdf1e | 411 | if (grp->open && grp->count == 1) { |
1da177e4 LT |
412 | err = grp->open(port->private_data, info); |
413 | if (err < 0) { | |
414 | module_put(port->owner); | |
415 | grp->count--; | |
416 | } | |
417 | } | |
418 | if (err >= 0 && send_ack && client->type == USER_CLIENT) | |
419 | snd_seq_client_notify_subscription(port->addr.client, port->addr.port, | |
420 | info, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED); | |
421 | ||
422 | return err; | |
423 | } | |
424 | ||
c7e0b5bf TI |
425 | static int unsubscribe_port(struct snd_seq_client *client, |
426 | struct snd_seq_client_port *port, | |
427 | struct snd_seq_port_subs_info *grp, | |
428 | struct snd_seq_port_subscribe *info, | |
429 | int send_ack) | |
1da177e4 LT |
430 | { |
431 | int err = 0; | |
432 | ||
433 | if (! grp->count) | |
434 | return -EINVAL; | |
435 | grp->count--; | |
a55bdf1e | 436 | if (grp->close && grp->count == 0) |
1da177e4 LT |
437 | err = grp->close(port->private_data, info); |
438 | if (send_ack && client->type == USER_CLIENT) | |
439 | snd_seq_client_notify_subscription(port->addr.client, port->addr.port, | |
440 | info, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED); | |
441 | module_put(port->owner); | |
442 | return err; | |
443 | } | |
444 | ||
445 | ||
446 | ||
447 | /* check if both addresses are identical */ | |
c7e0b5bf | 448 | static inline int addr_match(struct snd_seq_addr *r, struct snd_seq_addr *s) |
1da177e4 LT |
449 | { |
450 | return (r->client == s->client) && (r->port == s->port); | |
451 | } | |
452 | ||
453 | /* check the two subscribe info match */ | |
454 | /* if flags is zero, checks only sender and destination addresses */ | |
c7e0b5bf TI |
455 | static int match_subs_info(struct snd_seq_port_subscribe *r, |
456 | struct snd_seq_port_subscribe *s) | |
1da177e4 LT |
457 | { |
458 | if (addr_match(&r->sender, &s->sender) && | |
459 | addr_match(&r->dest, &s->dest)) { | |
460 | if (r->flags && r->flags == s->flags) | |
461 | return r->queue == s->queue; | |
462 | else if (! r->flags) | |
463 | return 1; | |
464 | } | |
465 | return 0; | |
466 | } | |
467 | ||
7f0973e9 TI |
468 | static int check_and_subscribe_port(struct snd_seq_client *client, |
469 | struct snd_seq_client_port *port, | |
470 | struct snd_seq_subscribers *subs, | |
471 | bool is_src, bool exclusive, bool ack) | |
1da177e4 | 472 | { |
7f0973e9 TI |
473 | struct snd_seq_port_subs_info *grp; |
474 | struct list_head *p; | |
475 | struct snd_seq_subscribers *s; | |
476 | int err; | |
1da177e4 | 477 | |
7f0973e9 | 478 | grp = is_src ? &port->c_src : &port->c_dest; |
1da177e4 | 479 | err = -EBUSY; |
7f0973e9 | 480 | down_write(&grp->list_mutex); |
1da177e4 | 481 | if (exclusive) { |
7f0973e9 | 482 | if (!list_empty(&grp->list_head)) |
1da177e4 LT |
483 | goto __error; |
484 | } else { | |
7f0973e9 | 485 | if (grp->exclusive) |
1da177e4 LT |
486 | goto __error; |
487 | /* check whether already exists */ | |
7f0973e9 TI |
488 | list_for_each(p, &grp->list_head) { |
489 | s = get_subscriber(p, is_src); | |
490 | if (match_subs_info(&subs->info, &s->info)) | |
1da177e4 LT |
491 | goto __error; |
492 | } | |
493 | } | |
494 | ||
7f0973e9 TI |
495 | err = subscribe_port(client, port, grp, &subs->info, ack); |
496 | if (err < 0) { | |
497 | grp->exclusive = 0; | |
1da177e4 | 498 | goto __error; |
7f0973e9 | 499 | } |
1da177e4 LT |
500 | |
501 | /* add to list */ | |
7f0973e9 TI |
502 | write_lock_irq(&grp->list_lock); |
503 | if (is_src) | |
504 | list_add_tail(&subs->src_list, &grp->list_head); | |
505 | else | |
506 | list_add_tail(&subs->dest_list, &grp->list_head); | |
507 | grp->exclusive = exclusive; | |
508 | atomic_inc(&subs->ref_count); | |
509 | write_unlock_irq(&grp->list_lock); | |
510 | err = 0; | |
511 | ||
512 | __error: | |
513 | up_write(&grp->list_mutex); | |
514 | return err; | |
515 | } | |
1da177e4 | 516 | |
7f0973e9 TI |
517 | static void delete_and_unsubscribe_port(struct snd_seq_client *client, |
518 | struct snd_seq_client_port *port, | |
519 | struct snd_seq_subscribers *subs, | |
520 | bool is_src, bool ack) | |
521 | { | |
522 | struct snd_seq_port_subs_info *grp; | |
13d5e5d4 TI |
523 | struct list_head *list; |
524 | bool empty; | |
7f0973e9 TI |
525 | |
526 | grp = is_src ? &port->c_src : &port->c_dest; | |
13d5e5d4 | 527 | list = is_src ? &subs->src_list : &subs->dest_list; |
7f0973e9 TI |
528 | down_write(&grp->list_mutex); |
529 | write_lock_irq(&grp->list_lock); | |
13d5e5d4 TI |
530 | empty = list_empty(list); |
531 | if (!empty) | |
532 | list_del_init(list); | |
7f0973e9 TI |
533 | grp->exclusive = 0; |
534 | write_unlock_irq(&grp->list_lock); | |
7f0973e9 | 535 | |
13d5e5d4 TI |
536 | if (!empty) |
537 | unsubscribe_port(client, port, grp, &subs->info, ack); | |
7c32ae35 | 538 | up_write(&grp->list_mutex); |
7f0973e9 TI |
539 | } |
540 | ||
541 | /* connect two ports */ | |
542 | int snd_seq_port_connect(struct snd_seq_client *connector, | |
543 | struct snd_seq_client *src_client, | |
544 | struct snd_seq_client_port *src_port, | |
545 | struct snd_seq_client *dest_client, | |
546 | struct snd_seq_client_port *dest_port, | |
547 | struct snd_seq_port_subscribe *info) | |
548 | { | |
549 | struct snd_seq_subscribers *subs; | |
550 | bool exclusive; | |
551 | int err; | |
552 | ||
553 | subs = kzalloc(sizeof(*subs), GFP_KERNEL); | |
554 | if (!subs) | |
555 | return -ENOMEM; | |
556 | ||
557 | subs->info = *info; | |
558 | atomic_set(&subs->ref_count, 0); | |
559 | INIT_LIST_HEAD(&subs->src_list); | |
560 | INIT_LIST_HEAD(&subs->dest_list); | |
561 | ||
562 | exclusive = !!(info->flags & SNDRV_SEQ_PORT_SUBS_EXCLUSIVE); | |
563 | ||
564 | err = check_and_subscribe_port(src_client, src_port, subs, true, | |
565 | exclusive, | |
566 | connector->number != src_client->number); | |
567 | if (err < 0) | |
568 | goto error; | |
569 | err = check_and_subscribe_port(dest_client, dest_port, subs, false, | |
570 | exclusive, | |
571 | connector->number != dest_client->number); | |
572 | if (err < 0) | |
573 | goto error_dest; | |
1da177e4 | 574 | |
1da177e4 LT |
575 | return 0; |
576 | ||
7f0973e9 TI |
577 | error_dest: |
578 | delete_and_unsubscribe_port(src_client, src_port, subs, true, | |
579 | connector->number != src_client->number); | |
580 | error: | |
1da177e4 | 581 | kfree(subs); |
1da177e4 LT |
582 | return err; |
583 | } | |
584 | ||
1da177e4 | 585 | /* remove the connection */ |
c7e0b5bf TI |
586 | int snd_seq_port_disconnect(struct snd_seq_client *connector, |
587 | struct snd_seq_client *src_client, | |
588 | struct snd_seq_client_port *src_port, | |
589 | struct snd_seq_client *dest_client, | |
590 | struct snd_seq_client_port *dest_port, | |
591 | struct snd_seq_port_subscribe *info) | |
1da177e4 | 592 | { |
c7e0b5bf | 593 | struct snd_seq_port_subs_info *src = &src_port->c_src; |
c7e0b5bf | 594 | struct snd_seq_subscribers *subs; |
1da177e4 | 595 | int err = -ENOENT; |
1da177e4 LT |
596 | |
597 | down_write(&src->list_mutex); | |
1da177e4 | 598 | /* look for the connection */ |
9244b2c3 | 599 | list_for_each_entry(subs, &src->list_head, src_list) { |
1da177e4 | 600 | if (match_subs_info(info, &subs->info)) { |
7f0973e9 | 601 | atomic_dec(&subs->ref_count); /* mark as not ready */ |
1da177e4 LT |
602 | err = 0; |
603 | break; | |
604 | } | |
605 | } | |
1da177e4 | 606 | up_write(&src->list_mutex); |
7f0973e9 TI |
607 | if (err < 0) |
608 | return err; | |
609 | ||
610 | delete_and_unsubscribe_port(src_client, src_port, subs, true, | |
611 | connector->number != src_client->number); | |
612 | delete_and_unsubscribe_port(dest_client, dest_port, subs, false, | |
613 | connector->number != dest_client->number); | |
614 | kfree(subs); | |
615 | return 0; | |
1da177e4 LT |
616 | } |
617 | ||
618 | ||
619 | /* get matched subscriber */ | |
2eabc5ec TI |
620 | int snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp, |
621 | struct snd_seq_addr *dest_addr, | |
622 | struct snd_seq_port_subscribe *subs) | |
1da177e4 | 623 | { |
2eabc5ec TI |
624 | struct snd_seq_subscribers *s; |
625 | int err = -ENOENT; | |
1da177e4 LT |
626 | |
627 | down_read(&src_grp->list_mutex); | |
9244b2c3 | 628 | list_for_each_entry(s, &src_grp->list_head, src_list) { |
1da177e4 | 629 | if (addr_match(dest_addr, &s->info.dest)) { |
2eabc5ec TI |
630 | *subs = s->info; |
631 | err = 0; | |
1da177e4 LT |
632 | break; |
633 | } | |
634 | } | |
635 | up_read(&src_grp->list_mutex); | |
2eabc5ec | 636 | return err; |
1da177e4 LT |
637 | } |
638 | ||
639 | /* | |
640 | * Attach a device driver that wants to receive events from the | |
641 | * sequencer. Returns the new port number on success. | |
642 | * A driver that wants to receive the events converted to midi, will | |
643 | * use snd_seq_midisynth_register_port(). | |
644 | */ | |
645 | /* exported */ | |
646 | int snd_seq_event_port_attach(int client, | |
c7e0b5bf | 647 | struct snd_seq_port_callback *pcbp, |
1da177e4 LT |
648 | int cap, int type, int midi_channels, |
649 | int midi_voices, char *portname) | |
650 | { | |
c7e0b5bf | 651 | struct snd_seq_port_info portinfo; |
1da177e4 LT |
652 | int ret; |
653 | ||
654 | /* Set up the port */ | |
655 | memset(&portinfo, 0, sizeof(portinfo)); | |
656 | portinfo.addr.client = client; | |
6231a895 | 657 | strlcpy(portinfo.name, portname ? portname : "Unnamed port", |
1da177e4 LT |
658 | sizeof(portinfo.name)); |
659 | ||
660 | portinfo.capability = cap; | |
661 | portinfo.type = type; | |
662 | portinfo.kernel = pcbp; | |
663 | portinfo.midi_channels = midi_channels; | |
664 | portinfo.midi_voices = midi_voices; | |
665 | ||
666 | /* Create it */ | |
667 | ret = snd_seq_kernel_client_ctl(client, | |
668 | SNDRV_SEQ_IOCTL_CREATE_PORT, | |
669 | &portinfo); | |
670 | ||
671 | if (ret >= 0) | |
672 | ret = portinfo.addr.port; | |
673 | ||
674 | return ret; | |
675 | } | |
91715ed9 | 676 | EXPORT_SYMBOL(snd_seq_event_port_attach); |
1da177e4 LT |
677 | |
678 | /* | |
679 | * Detach the driver from a port. | |
680 | */ | |
681 | /* exported */ | |
682 | int snd_seq_event_port_detach(int client, int port) | |
683 | { | |
c7e0b5bf | 684 | struct snd_seq_port_info portinfo; |
1da177e4 LT |
685 | int err; |
686 | ||
687 | memset(&portinfo, 0, sizeof(portinfo)); | |
688 | portinfo.addr.client = client; | |
689 | portinfo.addr.port = port; | |
690 | err = snd_seq_kernel_client_ctl(client, | |
691 | SNDRV_SEQ_IOCTL_DELETE_PORT, | |
692 | &portinfo); | |
693 | ||
694 | return err; | |
695 | } | |
91715ed9 | 696 | EXPORT_SYMBOL(snd_seq_event_port_detach); |