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[mirror_ubuntu-bionic-kernel.git] / sound / core / seq / seq_clientmgr.c
1 /*
2 * ALSA sequencer Client Manager
3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@perex.cz>
5 * Takashi Iwai <tiwai@suse.de>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24 #include <linux/init.h>
25 #include <linux/export.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <linux/kmod.h>
30
31 #include <sound/seq_kernel.h>
32 #include "seq_clientmgr.h"
33 #include "seq_memory.h"
34 #include "seq_queue.h"
35 #include "seq_timer.h"
36 #include "seq_info.h"
37 #include "seq_system.h"
38 #include <sound/seq_device.h>
39 #ifdef CONFIG_COMPAT
40 #include <linux/compat.h>
41 #endif
42
43 /* Client Manager
44
45 * this module handles the connections of userland and kernel clients
46 *
47 */
48
49 /*
50 * There are four ranges of client numbers (last two shared):
51 * 0..15: global clients
52 * 16..127: statically allocated client numbers for cards 0..27
53 * 128..191: dynamically allocated client numbers for cards 28..31
54 * 128..191: dynamically allocated client numbers for applications
55 */
56
57 /* number of kernel non-card clients */
58 #define SNDRV_SEQ_GLOBAL_CLIENTS 16
59 /* clients per cards, for static clients */
60 #define SNDRV_SEQ_CLIENTS_PER_CARD 4
61 /* dynamically allocated client numbers (both kernel drivers and user space) */
62 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
63
64 #define SNDRV_SEQ_LFLG_INPUT 0x0001
65 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
66 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
67
68 static DEFINE_SPINLOCK(clients_lock);
69 static DEFINE_MUTEX(register_mutex);
70
71 /*
72 * client table
73 */
74 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
75 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
76 static struct snd_seq_usage client_usage;
77
78 /*
79 * prototypes
80 */
81 static int bounce_error_event(struct snd_seq_client *client,
82 struct snd_seq_event *event,
83 int err, int atomic, int hop);
84 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
85 struct snd_seq_event *event,
86 int filter, int atomic, int hop);
87
88 /*
89 */
90 static inline unsigned short snd_seq_file_flags(struct file *file)
91 {
92 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
93 case FMODE_WRITE:
94 return SNDRV_SEQ_LFLG_OUTPUT;
95 case FMODE_READ:
96 return SNDRV_SEQ_LFLG_INPUT;
97 default:
98 return SNDRV_SEQ_LFLG_OPEN;
99 }
100 }
101
102 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
103 {
104 return snd_seq_total_cells(client->pool) > 0;
105 }
106
107 /* return pointer to client structure for specified id */
108 static struct snd_seq_client *clientptr(int clientid)
109 {
110 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
111 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
112 clientid);
113 return NULL;
114 }
115 return clienttab[clientid];
116 }
117
118 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
119 {
120 unsigned long flags;
121 struct snd_seq_client *client;
122
123 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
124 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
125 clientid);
126 return NULL;
127 }
128 spin_lock_irqsave(&clients_lock, flags);
129 client = clientptr(clientid);
130 if (client)
131 goto __lock;
132 if (clienttablock[clientid]) {
133 spin_unlock_irqrestore(&clients_lock, flags);
134 return NULL;
135 }
136 spin_unlock_irqrestore(&clients_lock, flags);
137 #ifdef CONFIG_MODULES
138 if (!in_interrupt()) {
139 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
140 static char card_requested[SNDRV_CARDS];
141 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
142 int idx;
143
144 if (!client_requested[clientid]) {
145 client_requested[clientid] = 1;
146 for (idx = 0; idx < 15; idx++) {
147 if (seq_client_load[idx] < 0)
148 break;
149 if (seq_client_load[idx] == clientid) {
150 request_module("snd-seq-client-%i",
151 clientid);
152 break;
153 }
154 }
155 }
156 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
157 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
158 SNDRV_SEQ_CLIENTS_PER_CARD;
159 if (card < snd_ecards_limit) {
160 if (! card_requested[card]) {
161 card_requested[card] = 1;
162 snd_request_card(card);
163 }
164 snd_seq_device_load_drivers();
165 }
166 }
167 spin_lock_irqsave(&clients_lock, flags);
168 client = clientptr(clientid);
169 if (client)
170 goto __lock;
171 spin_unlock_irqrestore(&clients_lock, flags);
172 }
173 #endif
174 return NULL;
175
176 __lock:
177 snd_use_lock_use(&client->use_lock);
178 spin_unlock_irqrestore(&clients_lock, flags);
179 return client;
180 }
181
182 static void usage_alloc(struct snd_seq_usage *res, int num)
183 {
184 res->cur += num;
185 if (res->cur > res->peak)
186 res->peak = res->cur;
187 }
188
189 static void usage_free(struct snd_seq_usage *res, int num)
190 {
191 res->cur -= num;
192 }
193
194 /* initialise data structures */
195 int __init client_init_data(void)
196 {
197 /* zap out the client table */
198 memset(&clienttablock, 0, sizeof(clienttablock));
199 memset(&clienttab, 0, sizeof(clienttab));
200 return 0;
201 }
202
203
204 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
205 {
206 unsigned long flags;
207 int c;
208 struct snd_seq_client *client;
209
210 /* init client data */
211 client = kzalloc(sizeof(*client), GFP_KERNEL);
212 if (client == NULL)
213 return NULL;
214 client->pool = snd_seq_pool_new(poolsize);
215 if (client->pool == NULL) {
216 kfree(client);
217 return NULL;
218 }
219 client->type = NO_CLIENT;
220 snd_use_lock_init(&client->use_lock);
221 rwlock_init(&client->ports_lock);
222 mutex_init(&client->ports_mutex);
223 INIT_LIST_HEAD(&client->ports_list_head);
224
225 /* find free slot in the client table */
226 spin_lock_irqsave(&clients_lock, flags);
227 if (client_index < 0) {
228 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
229 c < SNDRV_SEQ_MAX_CLIENTS;
230 c++) {
231 if (clienttab[c] || clienttablock[c])
232 continue;
233 clienttab[client->number = c] = client;
234 spin_unlock_irqrestore(&clients_lock, flags);
235 return client;
236 }
237 } else {
238 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
239 clienttab[client->number = client_index] = client;
240 spin_unlock_irqrestore(&clients_lock, flags);
241 return client;
242 }
243 }
244 spin_unlock_irqrestore(&clients_lock, flags);
245 snd_seq_pool_delete(&client->pool);
246 kfree(client);
247 return NULL; /* no free slot found or busy, return failure code */
248 }
249
250
251 static int seq_free_client1(struct snd_seq_client *client)
252 {
253 unsigned long flags;
254
255 if (!client)
256 return 0;
257 snd_seq_delete_all_ports(client);
258 snd_seq_queue_client_leave(client->number);
259 spin_lock_irqsave(&clients_lock, flags);
260 clienttablock[client->number] = 1;
261 clienttab[client->number] = NULL;
262 spin_unlock_irqrestore(&clients_lock, flags);
263 snd_use_lock_sync(&client->use_lock);
264 snd_seq_queue_client_termination(client->number);
265 if (client->pool)
266 snd_seq_pool_delete(&client->pool);
267 spin_lock_irqsave(&clients_lock, flags);
268 clienttablock[client->number] = 0;
269 spin_unlock_irqrestore(&clients_lock, flags);
270 return 0;
271 }
272
273
274 static void seq_free_client(struct snd_seq_client * client)
275 {
276 mutex_lock(&register_mutex);
277 switch (client->type) {
278 case NO_CLIENT:
279 pr_warn("ALSA: seq: Trying to free unused client %d\n",
280 client->number);
281 break;
282 case USER_CLIENT:
283 case KERNEL_CLIENT:
284 seq_free_client1(client);
285 usage_free(&client_usage, 1);
286 break;
287
288 default:
289 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
290 client->number, client->type);
291 }
292 mutex_unlock(&register_mutex);
293
294 snd_seq_system_client_ev_client_exit(client->number);
295 }
296
297
298
299 /* -------------------------------------------------------- */
300
301 /* create a user client */
302 static int snd_seq_open(struct inode *inode, struct file *file)
303 {
304 int c, mode; /* client id */
305 struct snd_seq_client *client;
306 struct snd_seq_user_client *user;
307 int err;
308
309 err = nonseekable_open(inode, file);
310 if (err < 0)
311 return err;
312
313 if (mutex_lock_interruptible(&register_mutex))
314 return -ERESTARTSYS;
315 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
316 if (client == NULL) {
317 mutex_unlock(&register_mutex);
318 return -ENOMEM; /* failure code */
319 }
320
321 mode = snd_seq_file_flags(file);
322 if (mode & SNDRV_SEQ_LFLG_INPUT)
323 client->accept_input = 1;
324 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
325 client->accept_output = 1;
326
327 user = &client->data.user;
328 user->fifo = NULL;
329 user->fifo_pool_size = 0;
330
331 if (mode & SNDRV_SEQ_LFLG_INPUT) {
332 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
333 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
334 if (user->fifo == NULL) {
335 seq_free_client1(client);
336 kfree(client);
337 mutex_unlock(&register_mutex);
338 return -ENOMEM;
339 }
340 }
341
342 usage_alloc(&client_usage, 1);
343 client->type = USER_CLIENT;
344 mutex_unlock(&register_mutex);
345
346 c = client->number;
347 file->private_data = client;
348
349 /* fill client data */
350 user->file = file;
351 sprintf(client->name, "Client-%d", c);
352 client->data.user.owner = get_pid(task_pid(current));
353
354 /* make others aware this new client */
355 snd_seq_system_client_ev_client_start(c);
356
357 return 0;
358 }
359
360 /* delete a user client */
361 static int snd_seq_release(struct inode *inode, struct file *file)
362 {
363 struct snd_seq_client *client = file->private_data;
364
365 if (client) {
366 seq_free_client(client);
367 if (client->data.user.fifo)
368 snd_seq_fifo_delete(&client->data.user.fifo);
369 put_pid(client->data.user.owner);
370 kfree(client);
371 }
372
373 return 0;
374 }
375
376
377 /* handle client read() */
378 /* possible error values:
379 * -ENXIO invalid client or file open mode
380 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
381 * -EINVAL no enough user-space buffer to write the whole event
382 * -EFAULT seg. fault during copy to user space
383 */
384 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
385 loff_t *offset)
386 {
387 struct snd_seq_client *client = file->private_data;
388 struct snd_seq_fifo *fifo;
389 int err;
390 long result = 0;
391 struct snd_seq_event_cell *cell;
392
393 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
394 return -ENXIO;
395
396 if (!access_ok(VERIFY_WRITE, buf, count))
397 return -EFAULT;
398
399 /* check client structures are in place */
400 if (snd_BUG_ON(!client))
401 return -ENXIO;
402
403 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
404 return -ENXIO;
405
406 if (atomic_read(&fifo->overflow) > 0) {
407 /* buffer overflow is detected */
408 snd_seq_fifo_clear(fifo);
409 /* return error code */
410 return -ENOSPC;
411 }
412
413 cell = NULL;
414 err = 0;
415 snd_seq_fifo_lock(fifo);
416
417 /* while data available in queue */
418 while (count >= sizeof(struct snd_seq_event)) {
419 int nonblock;
420
421 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
422 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
423 break;
424 }
425 if (snd_seq_ev_is_variable(&cell->event)) {
426 struct snd_seq_event tmpev;
427 tmpev = cell->event;
428 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
429 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
430 err = -EFAULT;
431 break;
432 }
433 count -= sizeof(struct snd_seq_event);
434 buf += sizeof(struct snd_seq_event);
435 err = snd_seq_expand_var_event(&cell->event, count,
436 (char __force *)buf, 0,
437 sizeof(struct snd_seq_event));
438 if (err < 0)
439 break;
440 result += err;
441 count -= err;
442 buf += err;
443 } else {
444 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
445 err = -EFAULT;
446 break;
447 }
448 count -= sizeof(struct snd_seq_event);
449 buf += sizeof(struct snd_seq_event);
450 }
451 snd_seq_cell_free(cell);
452 cell = NULL; /* to be sure */
453 result += sizeof(struct snd_seq_event);
454 }
455
456 if (err < 0) {
457 if (cell)
458 snd_seq_fifo_cell_putback(fifo, cell);
459 if (err == -EAGAIN && result > 0)
460 err = 0;
461 }
462 snd_seq_fifo_unlock(fifo);
463
464 return (err < 0) ? err : result;
465 }
466
467
468 /*
469 * check access permission to the port
470 */
471 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
472 {
473 if ((port->capability & flags) != flags)
474 return 0;
475 return flags;
476 }
477
478 /*
479 * check if the destination client is available, and return the pointer
480 * if filter is non-zero, client filter bitmap is tested.
481 */
482 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
483 int filter)
484 {
485 struct snd_seq_client *dest;
486
487 dest = snd_seq_client_use_ptr(event->dest.client);
488 if (dest == NULL)
489 return NULL;
490 if (! dest->accept_input)
491 goto __not_avail;
492 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
493 ! test_bit(event->type, dest->event_filter))
494 goto __not_avail;
495 if (filter && !(dest->filter & filter))
496 goto __not_avail;
497
498 return dest; /* ok - accessible */
499 __not_avail:
500 snd_seq_client_unlock(dest);
501 return NULL;
502 }
503
504
505 /*
506 * Return the error event.
507 *
508 * If the receiver client is a user client, the original event is
509 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
510 * the original event is also variable length, the external data is
511 * copied after the event record.
512 * If the receiver client is a kernel client, the original event is
513 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
514 * kmalloc.
515 */
516 static int bounce_error_event(struct snd_seq_client *client,
517 struct snd_seq_event *event,
518 int err, int atomic, int hop)
519 {
520 struct snd_seq_event bounce_ev;
521 int result;
522
523 if (client == NULL ||
524 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
525 ! client->accept_input)
526 return 0; /* ignored */
527
528 /* set up quoted error */
529 memset(&bounce_ev, 0, sizeof(bounce_ev));
530 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
531 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
532 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
533 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
534 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
535 bounce_ev.dest.client = client->number;
536 bounce_ev.dest.port = event->source.port;
537 bounce_ev.data.quote.origin = event->dest;
538 bounce_ev.data.quote.event = event;
539 bounce_ev.data.quote.value = -err; /* use positive value */
540 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
541 if (result < 0) {
542 client->event_lost++;
543 return result;
544 }
545
546 return result;
547 }
548
549
550 /*
551 * rewrite the time-stamp of the event record with the curren time
552 * of the given queue.
553 * return non-zero if updated.
554 */
555 static int update_timestamp_of_queue(struct snd_seq_event *event,
556 int queue, int real_time)
557 {
558 struct snd_seq_queue *q;
559
560 q = queueptr(queue);
561 if (! q)
562 return 0;
563 event->queue = queue;
564 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
565 if (real_time) {
566 event->time.time = snd_seq_timer_get_cur_time(q->timer);
567 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
568 } else {
569 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
570 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
571 }
572 queuefree(q);
573 return 1;
574 }
575
576
577 /*
578 * deliver an event to the specified destination.
579 * if filter is non-zero, client filter bitmap is tested.
580 *
581 * RETURN VALUE: 0 : if succeeded
582 * <0 : error
583 */
584 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
585 struct snd_seq_event *event,
586 int filter, int atomic, int hop)
587 {
588 struct snd_seq_client *dest = NULL;
589 struct snd_seq_client_port *dest_port = NULL;
590 int result = -ENOENT;
591 int direct;
592
593 direct = snd_seq_ev_is_direct(event);
594
595 dest = get_event_dest_client(event, filter);
596 if (dest == NULL)
597 goto __skip;
598 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
599 if (dest_port == NULL)
600 goto __skip;
601
602 /* check permission */
603 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
604 result = -EPERM;
605 goto __skip;
606 }
607
608 if (dest_port->timestamping)
609 update_timestamp_of_queue(event, dest_port->time_queue,
610 dest_port->time_real);
611
612 switch (dest->type) {
613 case USER_CLIENT:
614 if (dest->data.user.fifo)
615 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
616 break;
617
618 case KERNEL_CLIENT:
619 if (dest_port->event_input == NULL)
620 break;
621 result = dest_port->event_input(event, direct,
622 dest_port->private_data,
623 atomic, hop);
624 break;
625 default:
626 break;
627 }
628
629 __skip:
630 if (dest_port)
631 snd_seq_port_unlock(dest_port);
632 if (dest)
633 snd_seq_client_unlock(dest);
634
635 if (result < 0 && !direct) {
636 result = bounce_error_event(client, event, result, atomic, hop);
637 }
638 return result;
639 }
640
641
642 /*
643 * send the event to all subscribers:
644 */
645 static int deliver_to_subscribers(struct snd_seq_client *client,
646 struct snd_seq_event *event,
647 int atomic, int hop)
648 {
649 struct snd_seq_subscribers *subs;
650 int err, result = 0, num_ev = 0;
651 struct snd_seq_event event_saved;
652 struct snd_seq_client_port *src_port;
653 struct snd_seq_port_subs_info *grp;
654
655 src_port = snd_seq_port_use_ptr(client, event->source.port);
656 if (src_port == NULL)
657 return -EINVAL; /* invalid source port */
658 /* save original event record */
659 event_saved = *event;
660 grp = &src_port->c_src;
661
662 /* lock list */
663 if (atomic)
664 read_lock(&grp->list_lock);
665 else
666 down_read(&grp->list_mutex);
667 list_for_each_entry(subs, &grp->list_head, src_list) {
668 /* both ports ready? */
669 if (atomic_read(&subs->ref_count) != 2)
670 continue;
671 event->dest = subs->info.dest;
672 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
673 /* convert time according to flag with subscription */
674 update_timestamp_of_queue(event, subs->info.queue,
675 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
676 err = snd_seq_deliver_single_event(client, event,
677 0, atomic, hop);
678 if (err < 0) {
679 /* save first error that occurs and continue */
680 if (!result)
681 result = err;
682 continue;
683 }
684 num_ev++;
685 /* restore original event record */
686 *event = event_saved;
687 }
688 if (atomic)
689 read_unlock(&grp->list_lock);
690 else
691 up_read(&grp->list_mutex);
692 *event = event_saved; /* restore */
693 snd_seq_port_unlock(src_port);
694 return (result < 0) ? result : num_ev;
695 }
696
697
698 #ifdef SUPPORT_BROADCAST
699 /*
700 * broadcast to all ports:
701 */
702 static int port_broadcast_event(struct snd_seq_client *client,
703 struct snd_seq_event *event,
704 int atomic, int hop)
705 {
706 int num_ev = 0, err, result = 0;
707 struct snd_seq_client *dest_client;
708 struct snd_seq_client_port *port;
709
710 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
711 if (dest_client == NULL)
712 return 0; /* no matching destination */
713
714 read_lock(&dest_client->ports_lock);
715 list_for_each_entry(port, &dest_client->ports_list_head, list) {
716 event->dest.port = port->addr.port;
717 /* pass NULL as source client to avoid error bounce */
718 err = snd_seq_deliver_single_event(NULL, event,
719 SNDRV_SEQ_FILTER_BROADCAST,
720 atomic, hop);
721 if (err < 0) {
722 /* save first error that occurs and continue */
723 if (!result)
724 result = err;
725 continue;
726 }
727 num_ev++;
728 }
729 read_unlock(&dest_client->ports_lock);
730 snd_seq_client_unlock(dest_client);
731 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
732 return (result < 0) ? result : num_ev;
733 }
734
735 /*
736 * send the event to all clients:
737 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
738 */
739 static int broadcast_event(struct snd_seq_client *client,
740 struct snd_seq_event *event, int atomic, int hop)
741 {
742 int err, result = 0, num_ev = 0;
743 int dest;
744 struct snd_seq_addr addr;
745
746 addr = event->dest; /* save */
747
748 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
749 /* don't send to itself */
750 if (dest == client->number)
751 continue;
752 event->dest.client = dest;
753 event->dest.port = addr.port;
754 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
755 err = port_broadcast_event(client, event, atomic, hop);
756 else
757 /* pass NULL as source client to avoid error bounce */
758 err = snd_seq_deliver_single_event(NULL, event,
759 SNDRV_SEQ_FILTER_BROADCAST,
760 atomic, hop);
761 if (err < 0) {
762 /* save first error that occurs and continue */
763 if (!result)
764 result = err;
765 continue;
766 }
767 num_ev += err;
768 }
769 event->dest = addr; /* restore */
770 return (result < 0) ? result : num_ev;
771 }
772
773
774 /* multicast - not supported yet */
775 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
776 int atomic, int hop)
777 {
778 pr_debug("ALSA: seq: multicast not supported yet.\n");
779 return 0; /* ignored */
780 }
781 #endif /* SUPPORT_BROADCAST */
782
783
784 /* deliver an event to the destination port(s).
785 * if the event is to subscribers or broadcast, the event is dispatched
786 * to multiple targets.
787 *
788 * RETURN VALUE: n > 0 : the number of delivered events.
789 * n == 0 : the event was not passed to any client.
790 * n < 0 : error - event was not processed.
791 */
792 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
793 int atomic, int hop)
794 {
795 int result;
796
797 hop++;
798 if (hop >= SNDRV_SEQ_MAX_HOPS) {
799 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
800 event->source.client, event->source.port,
801 event->dest.client, event->dest.port);
802 return -EMLINK;
803 }
804
805 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
806 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
807 result = deliver_to_subscribers(client, event, atomic, hop);
808 #ifdef SUPPORT_BROADCAST
809 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
810 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
811 result = broadcast_event(client, event, atomic, hop);
812 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
813 result = multicast_event(client, event, atomic, hop);
814 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
815 result = port_broadcast_event(client, event, atomic, hop);
816 #endif
817 else
818 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
819
820 return result;
821 }
822
823 /*
824 * dispatch an event cell:
825 * This function is called only from queue check routines in timer
826 * interrupts or after enqueued.
827 * The event cell shall be released or re-queued in this function.
828 *
829 * RETURN VALUE: n > 0 : the number of delivered events.
830 * n == 0 : the event was not passed to any client.
831 * n < 0 : error - event was not processed.
832 */
833 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
834 {
835 struct snd_seq_client *client;
836 int result;
837
838 if (snd_BUG_ON(!cell))
839 return -EINVAL;
840
841 client = snd_seq_client_use_ptr(cell->event.source.client);
842 if (client == NULL) {
843 snd_seq_cell_free(cell); /* release this cell */
844 return -EINVAL;
845 }
846
847 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
848 /* NOTE event:
849 * the event cell is re-used as a NOTE-OFF event and
850 * enqueued again.
851 */
852 struct snd_seq_event tmpev, *ev;
853
854 /* reserve this event to enqueue note-off later */
855 tmpev = cell->event;
856 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
857 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
858
859 /*
860 * This was originally a note event. We now re-use the
861 * cell for the note-off event.
862 */
863
864 ev = &cell->event;
865 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
866 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
867
868 /* add the duration time */
869 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
870 case SNDRV_SEQ_TIME_STAMP_TICK:
871 ev->time.tick += ev->data.note.duration;
872 break;
873 case SNDRV_SEQ_TIME_STAMP_REAL:
874 /* unit for duration is ms */
875 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
876 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
877 ev->time.time.tv_nsec / 1000000000;
878 ev->time.time.tv_nsec %= 1000000000;
879 break;
880 }
881 ev->data.note.velocity = ev->data.note.off_velocity;
882
883 /* Now queue this cell as the note off event */
884 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
885 snd_seq_cell_free(cell); /* release this cell */
886
887 } else {
888 /* Normal events:
889 * event cell is freed after processing the event
890 */
891
892 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
893 snd_seq_cell_free(cell);
894 }
895
896 snd_seq_client_unlock(client);
897 return result;
898 }
899
900
901 /* Allocate a cell from client pool and enqueue it to queue:
902 * if pool is empty and blocking is TRUE, sleep until a new cell is
903 * available.
904 */
905 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
906 struct snd_seq_event *event,
907 struct file *file, int blocking,
908 int atomic, int hop)
909 {
910 struct snd_seq_event_cell *cell;
911 int err;
912
913 /* special queue values - force direct passing */
914 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
915 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
916 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
917 } else
918 #ifdef SUPPORT_BROADCAST
919 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
920 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
921 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
922 }
923 #endif
924 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
925 /* check presence of source port */
926 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
927 if (src_port == NULL)
928 return -EINVAL;
929 snd_seq_port_unlock(src_port);
930 }
931
932 /* direct event processing without enqueued */
933 if (snd_seq_ev_is_direct(event)) {
934 if (event->type == SNDRV_SEQ_EVENT_NOTE)
935 return -EINVAL; /* this event must be enqueued! */
936 return snd_seq_deliver_event(client, event, atomic, hop);
937 }
938
939 /* Not direct, normal queuing */
940 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
941 return -EINVAL; /* invalid queue */
942 if (! snd_seq_write_pool_allocated(client))
943 return -ENXIO; /* queue is not allocated */
944
945 /* allocate an event cell */
946 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
947 if (err < 0)
948 return err;
949
950 /* we got a cell. enqueue it. */
951 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
952 snd_seq_cell_free(cell);
953 return err;
954 }
955
956 return 0;
957 }
958
959
960 /*
961 * check validity of event type and data length.
962 * return non-zero if invalid.
963 */
964 static int check_event_type_and_length(struct snd_seq_event *ev)
965 {
966 switch (snd_seq_ev_length_type(ev)) {
967 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
968 if (snd_seq_ev_is_variable_type(ev))
969 return -EINVAL;
970 break;
971 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
972 if (! snd_seq_ev_is_variable_type(ev) ||
973 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
974 return -EINVAL;
975 break;
976 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
977 if (! snd_seq_ev_is_direct(ev))
978 return -EINVAL;
979 break;
980 }
981 return 0;
982 }
983
984
985 /* handle write() */
986 /* possible error values:
987 * -ENXIO invalid client or file open mode
988 * -ENOMEM malloc failed
989 * -EFAULT seg. fault during copy from user space
990 * -EINVAL invalid event
991 * -EAGAIN no space in output pool
992 * -EINTR interrupts while sleep
993 * -EMLINK too many hops
994 * others depends on return value from driver callback
995 */
996 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
997 size_t count, loff_t *offset)
998 {
999 struct snd_seq_client *client = file->private_data;
1000 int written = 0, len;
1001 int err = -EINVAL;
1002 struct snd_seq_event event;
1003
1004 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1005 return -ENXIO;
1006
1007 /* check client structures are in place */
1008 if (snd_BUG_ON(!client))
1009 return -ENXIO;
1010
1011 if (!client->accept_output || client->pool == NULL)
1012 return -ENXIO;
1013
1014 /* allocate the pool now if the pool is not allocated yet */
1015 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1016 if (snd_seq_pool_init(client->pool) < 0)
1017 return -ENOMEM;
1018 }
1019
1020 /* only process whole events */
1021 while (count >= sizeof(struct snd_seq_event)) {
1022 /* Read in the event header from the user */
1023 len = sizeof(event);
1024 if (copy_from_user(&event, buf, len)) {
1025 err = -EFAULT;
1026 break;
1027 }
1028 event.source.client = client->number; /* fill in client number */
1029 /* Check for extension data length */
1030 if (check_event_type_and_length(&event)) {
1031 err = -EINVAL;
1032 break;
1033 }
1034
1035 /* check for special events */
1036 if (event.type == SNDRV_SEQ_EVENT_NONE)
1037 goto __skip_event;
1038 else if (snd_seq_ev_is_reserved(&event)) {
1039 err = -EINVAL;
1040 break;
1041 }
1042
1043 if (snd_seq_ev_is_variable(&event)) {
1044 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1045 if ((size_t)(extlen + len) > count) {
1046 /* back out, will get an error this time or next */
1047 err = -EINVAL;
1048 break;
1049 }
1050 /* set user space pointer */
1051 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1052 event.data.ext.ptr = (char __force *)buf
1053 + sizeof(struct snd_seq_event);
1054 len += extlen; /* increment data length */
1055 } else {
1056 #ifdef CONFIG_COMPAT
1057 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1058 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1059 event.data.ext.ptr = ptr;
1060 }
1061 #endif
1062 }
1063
1064 /* ok, enqueue it */
1065 err = snd_seq_client_enqueue_event(client, &event, file,
1066 !(file->f_flags & O_NONBLOCK),
1067 0, 0);
1068 if (err < 0)
1069 break;
1070
1071 __skip_event:
1072 /* Update pointers and counts */
1073 count -= len;
1074 buf += len;
1075 written += len;
1076 }
1077
1078 return written ? written : err;
1079 }
1080
1081
1082 /*
1083 * handle polling
1084 */
1085 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1086 {
1087 struct snd_seq_client *client = file->private_data;
1088 unsigned int mask = 0;
1089
1090 /* check client structures are in place */
1091 if (snd_BUG_ON(!client))
1092 return -ENXIO;
1093
1094 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1095 client->data.user.fifo) {
1096
1097 /* check if data is available in the outqueue */
1098 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1099 mask |= POLLIN | POLLRDNORM;
1100 }
1101
1102 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1103
1104 /* check if data is available in the pool */
1105 if (!snd_seq_write_pool_allocated(client) ||
1106 snd_seq_pool_poll_wait(client->pool, file, wait))
1107 mask |= POLLOUT | POLLWRNORM;
1108 }
1109
1110 return mask;
1111 }
1112
1113
1114 /*-----------------------------------------------------*/
1115
1116 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1117 {
1118 int *pversion = arg;
1119
1120 *pversion = SNDRV_SEQ_VERSION;
1121 return 0;
1122 }
1123
1124 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1125 {
1126 int *client_id = arg;
1127
1128 *client_id = client->number;
1129 return 0;
1130 }
1131
1132 /* SYSTEM_INFO ioctl() */
1133 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1134 {
1135 struct snd_seq_system_info *info = arg;
1136
1137 memset(info, 0, sizeof(*info));
1138 /* fill the info fields */
1139 info->queues = SNDRV_SEQ_MAX_QUEUES;
1140 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1141 info->ports = SNDRV_SEQ_MAX_PORTS;
1142 info->channels = 256; /* fixed limit */
1143 info->cur_clients = client_usage.cur;
1144 info->cur_queues = snd_seq_queue_get_cur_queues();
1145
1146 return 0;
1147 }
1148
1149
1150 /* RUNNING_MODE ioctl() */
1151 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1152 {
1153 struct snd_seq_running_info *info = arg;
1154 struct snd_seq_client *cptr;
1155 int err = 0;
1156
1157 /* requested client number */
1158 cptr = snd_seq_client_use_ptr(info->client);
1159 if (cptr == NULL)
1160 return -ENOENT; /* don't change !!! */
1161
1162 #ifdef SNDRV_BIG_ENDIAN
1163 if (!info->big_endian) {
1164 err = -EINVAL;
1165 goto __err;
1166 }
1167 #else
1168 if (info->big_endian) {
1169 err = -EINVAL;
1170 goto __err;
1171 }
1172
1173 #endif
1174 if (info->cpu_mode > sizeof(long)) {
1175 err = -EINVAL;
1176 goto __err;
1177 }
1178 cptr->convert32 = (info->cpu_mode < sizeof(long));
1179 __err:
1180 snd_seq_client_unlock(cptr);
1181 return err;
1182 }
1183
1184 /* CLIENT_INFO ioctl() */
1185 static void get_client_info(struct snd_seq_client *cptr,
1186 struct snd_seq_client_info *info)
1187 {
1188 info->client = cptr->number;
1189
1190 /* fill the info fields */
1191 info->type = cptr->type;
1192 strcpy(info->name, cptr->name);
1193 info->filter = cptr->filter;
1194 info->event_lost = cptr->event_lost;
1195 memcpy(info->event_filter, cptr->event_filter, 32);
1196 info->num_ports = cptr->num_ports;
1197
1198 if (cptr->type == USER_CLIENT)
1199 info->pid = pid_vnr(cptr->data.user.owner);
1200 else
1201 info->pid = -1;
1202
1203 if (cptr->type == KERNEL_CLIENT)
1204 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1205 else
1206 info->card = -1;
1207
1208 memset(info->reserved, 0, sizeof(info->reserved));
1209 }
1210
1211 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1212 void *arg)
1213 {
1214 struct snd_seq_client_info *client_info = arg;
1215 struct snd_seq_client *cptr;
1216
1217 /* requested client number */
1218 cptr = snd_seq_client_use_ptr(client_info->client);
1219 if (cptr == NULL)
1220 return -ENOENT; /* don't change !!! */
1221
1222 get_client_info(cptr, client_info);
1223 snd_seq_client_unlock(cptr);
1224
1225 return 0;
1226 }
1227
1228
1229 /* CLIENT_INFO ioctl() */
1230 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1231 void *arg)
1232 {
1233 struct snd_seq_client_info *client_info = arg;
1234
1235 /* it is not allowed to set the info fields for an another client */
1236 if (client->number != client_info->client)
1237 return -EPERM;
1238 /* also client type must be set now */
1239 if (client->type != client_info->type)
1240 return -EINVAL;
1241
1242 /* fill the info fields */
1243 if (client_info->name[0])
1244 strlcpy(client->name, client_info->name, sizeof(client->name));
1245
1246 client->filter = client_info->filter;
1247 client->event_lost = client_info->event_lost;
1248 memcpy(client->event_filter, client_info->event_filter, 32);
1249
1250 return 0;
1251 }
1252
1253
1254 /*
1255 * CREATE PORT ioctl()
1256 */
1257 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1258 {
1259 struct snd_seq_port_info *info = arg;
1260 struct snd_seq_client_port *port;
1261 struct snd_seq_port_callback *callback;
1262
1263 /* it is not allowed to create the port for an another client */
1264 if (info->addr.client != client->number)
1265 return -EPERM;
1266
1267 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1268 if (port == NULL)
1269 return -ENOMEM;
1270
1271 if (client->type == USER_CLIENT && info->kernel) {
1272 snd_seq_delete_port(client, port->addr.port);
1273 return -EINVAL;
1274 }
1275 if (client->type == KERNEL_CLIENT) {
1276 if ((callback = info->kernel) != NULL) {
1277 if (callback->owner)
1278 port->owner = callback->owner;
1279 port->private_data = callback->private_data;
1280 port->private_free = callback->private_free;
1281 port->event_input = callback->event_input;
1282 port->c_src.open = callback->subscribe;
1283 port->c_src.close = callback->unsubscribe;
1284 port->c_dest.open = callback->use;
1285 port->c_dest.close = callback->unuse;
1286 }
1287 }
1288
1289 info->addr = port->addr;
1290
1291 snd_seq_set_port_info(port, info);
1292 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1293
1294 return 0;
1295 }
1296
1297 /*
1298 * DELETE PORT ioctl()
1299 */
1300 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1301 {
1302 struct snd_seq_port_info *info = arg;
1303 int err;
1304
1305 /* it is not allowed to remove the port for an another client */
1306 if (info->addr.client != client->number)
1307 return -EPERM;
1308
1309 err = snd_seq_delete_port(client, info->addr.port);
1310 if (err >= 0)
1311 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1312 return err;
1313 }
1314
1315
1316 /*
1317 * GET_PORT_INFO ioctl() (on any client)
1318 */
1319 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1320 {
1321 struct snd_seq_port_info *info = arg;
1322 struct snd_seq_client *cptr;
1323 struct snd_seq_client_port *port;
1324
1325 cptr = snd_seq_client_use_ptr(info->addr.client);
1326 if (cptr == NULL)
1327 return -ENXIO;
1328
1329 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1330 if (port == NULL) {
1331 snd_seq_client_unlock(cptr);
1332 return -ENOENT; /* don't change */
1333 }
1334
1335 /* get port info */
1336 snd_seq_get_port_info(port, info);
1337 snd_seq_port_unlock(port);
1338 snd_seq_client_unlock(cptr);
1339
1340 return 0;
1341 }
1342
1343
1344 /*
1345 * SET_PORT_INFO ioctl() (only ports on this/own client)
1346 */
1347 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1348 {
1349 struct snd_seq_port_info *info = arg;
1350 struct snd_seq_client_port *port;
1351
1352 if (info->addr.client != client->number) /* only set our own ports ! */
1353 return -EPERM;
1354 port = snd_seq_port_use_ptr(client, info->addr.port);
1355 if (port) {
1356 snd_seq_set_port_info(port, info);
1357 snd_seq_port_unlock(port);
1358 }
1359 return 0;
1360 }
1361
1362
1363 /*
1364 * port subscription (connection)
1365 */
1366 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1367 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1368
1369 static int check_subscription_permission(struct snd_seq_client *client,
1370 struct snd_seq_client_port *sport,
1371 struct snd_seq_client_port *dport,
1372 struct snd_seq_port_subscribe *subs)
1373 {
1374 if (client->number != subs->sender.client &&
1375 client->number != subs->dest.client) {
1376 /* connection by third client - check export permission */
1377 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1378 return -EPERM;
1379 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1380 return -EPERM;
1381 }
1382
1383 /* check read permission */
1384 /* if sender or receiver is the subscribing client itself,
1385 * no permission check is necessary
1386 */
1387 if (client->number != subs->sender.client) {
1388 if (! check_port_perm(sport, PERM_RD))
1389 return -EPERM;
1390 }
1391 /* check write permission */
1392 if (client->number != subs->dest.client) {
1393 if (! check_port_perm(dport, PERM_WR))
1394 return -EPERM;
1395 }
1396 return 0;
1397 }
1398
1399 /*
1400 * send an subscription notify event to user client:
1401 * client must be user client.
1402 */
1403 int snd_seq_client_notify_subscription(int client, int port,
1404 struct snd_seq_port_subscribe *info,
1405 int evtype)
1406 {
1407 struct snd_seq_event event;
1408
1409 memset(&event, 0, sizeof(event));
1410 event.type = evtype;
1411 event.data.connect.dest = info->dest;
1412 event.data.connect.sender = info->sender;
1413
1414 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1415 }
1416
1417
1418 /*
1419 * add to port's subscription list IOCTL interface
1420 */
1421 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1422 void *arg)
1423 {
1424 struct snd_seq_port_subscribe *subs = arg;
1425 int result = -EINVAL;
1426 struct snd_seq_client *receiver = NULL, *sender = NULL;
1427 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1428
1429 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1430 goto __end;
1431 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1432 goto __end;
1433 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1434 goto __end;
1435 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1436 goto __end;
1437
1438 result = check_subscription_permission(client, sport, dport, subs);
1439 if (result < 0)
1440 goto __end;
1441
1442 /* connect them */
1443 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1444 if (! result) /* broadcast announce */
1445 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1446 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1447 __end:
1448 if (sport)
1449 snd_seq_port_unlock(sport);
1450 if (dport)
1451 snd_seq_port_unlock(dport);
1452 if (sender)
1453 snd_seq_client_unlock(sender);
1454 if (receiver)
1455 snd_seq_client_unlock(receiver);
1456 return result;
1457 }
1458
1459
1460 /*
1461 * remove from port's subscription list
1462 */
1463 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1464 void *arg)
1465 {
1466 struct snd_seq_port_subscribe *subs = arg;
1467 int result = -ENXIO;
1468 struct snd_seq_client *receiver = NULL, *sender = NULL;
1469 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1470
1471 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1472 goto __end;
1473 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1474 goto __end;
1475 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1476 goto __end;
1477 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1478 goto __end;
1479
1480 result = check_subscription_permission(client, sport, dport, subs);
1481 if (result < 0)
1482 goto __end;
1483
1484 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1485 if (! result) /* broadcast announce */
1486 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1487 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1488 __end:
1489 if (sport)
1490 snd_seq_port_unlock(sport);
1491 if (dport)
1492 snd_seq_port_unlock(dport);
1493 if (sender)
1494 snd_seq_client_unlock(sender);
1495 if (receiver)
1496 snd_seq_client_unlock(receiver);
1497 return result;
1498 }
1499
1500
1501 /* CREATE_QUEUE ioctl() */
1502 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1503 {
1504 struct snd_seq_queue_info *info = arg;
1505 int result;
1506 struct snd_seq_queue *q;
1507
1508 result = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1509 if (result < 0)
1510 return result;
1511
1512 q = queueptr(result);
1513 if (q == NULL)
1514 return -EINVAL;
1515
1516 info->queue = q->queue;
1517 info->locked = q->locked;
1518 info->owner = q->owner;
1519
1520 /* set queue name */
1521 if (!info->name[0])
1522 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1523 strlcpy(q->name, info->name, sizeof(q->name));
1524 queuefree(q);
1525
1526 return 0;
1527 }
1528
1529 /* DELETE_QUEUE ioctl() */
1530 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1531 {
1532 struct snd_seq_queue_info *info = arg;
1533
1534 return snd_seq_queue_delete(client->number, info->queue);
1535 }
1536
1537 /* GET_QUEUE_INFO ioctl() */
1538 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1539 void *arg)
1540 {
1541 struct snd_seq_queue_info *info = arg;
1542 struct snd_seq_queue *q;
1543
1544 q = queueptr(info->queue);
1545 if (q == NULL)
1546 return -EINVAL;
1547
1548 memset(info, 0, sizeof(*info));
1549 info->queue = q->queue;
1550 info->owner = q->owner;
1551 info->locked = q->locked;
1552 strlcpy(info->name, q->name, sizeof(info->name));
1553 queuefree(q);
1554
1555 return 0;
1556 }
1557
1558 /* SET_QUEUE_INFO ioctl() */
1559 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1560 void *arg)
1561 {
1562 struct snd_seq_queue_info *info = arg;
1563 struct snd_seq_queue *q;
1564
1565 if (info->owner != client->number)
1566 return -EINVAL;
1567
1568 /* change owner/locked permission */
1569 if (snd_seq_queue_check_access(info->queue, client->number)) {
1570 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1571 return -EPERM;
1572 if (info->locked)
1573 snd_seq_queue_use(info->queue, client->number, 1);
1574 } else {
1575 return -EPERM;
1576 }
1577
1578 q = queueptr(info->queue);
1579 if (! q)
1580 return -EINVAL;
1581 if (q->owner != client->number) {
1582 queuefree(q);
1583 return -EPERM;
1584 }
1585 strlcpy(q->name, info->name, sizeof(q->name));
1586 queuefree(q);
1587
1588 return 0;
1589 }
1590
1591 /* GET_NAMED_QUEUE ioctl() */
1592 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1593 void *arg)
1594 {
1595 struct snd_seq_queue_info *info = arg;
1596 struct snd_seq_queue *q;
1597
1598 q = snd_seq_queue_find_name(info->name);
1599 if (q == NULL)
1600 return -EINVAL;
1601 info->queue = q->queue;
1602 info->owner = q->owner;
1603 info->locked = q->locked;
1604 queuefree(q);
1605
1606 return 0;
1607 }
1608
1609 /* GET_QUEUE_STATUS ioctl() */
1610 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1611 void *arg)
1612 {
1613 struct snd_seq_queue_status *status = arg;
1614 struct snd_seq_queue *queue;
1615 struct snd_seq_timer *tmr;
1616
1617 queue = queueptr(status->queue);
1618 if (queue == NULL)
1619 return -EINVAL;
1620 memset(status, 0, sizeof(*status));
1621 status->queue = queue->queue;
1622
1623 tmr = queue->timer;
1624 status->events = queue->tickq->cells + queue->timeq->cells;
1625
1626 status->time = snd_seq_timer_get_cur_time(tmr);
1627 status->tick = snd_seq_timer_get_cur_tick(tmr);
1628
1629 status->running = tmr->running;
1630
1631 status->flags = queue->flags;
1632 queuefree(queue);
1633
1634 return 0;
1635 }
1636
1637
1638 /* GET_QUEUE_TEMPO ioctl() */
1639 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1640 void *arg)
1641 {
1642 struct snd_seq_queue_tempo *tempo = arg;
1643 struct snd_seq_queue *queue;
1644 struct snd_seq_timer *tmr;
1645
1646 queue = queueptr(tempo->queue);
1647 if (queue == NULL)
1648 return -EINVAL;
1649 memset(tempo, 0, sizeof(*tempo));
1650 tempo->queue = queue->queue;
1651
1652 tmr = queue->timer;
1653
1654 tempo->tempo = tmr->tempo;
1655 tempo->ppq = tmr->ppq;
1656 tempo->skew_value = tmr->skew;
1657 tempo->skew_base = tmr->skew_base;
1658 queuefree(queue);
1659
1660 return 0;
1661 }
1662
1663
1664 /* SET_QUEUE_TEMPO ioctl() */
1665 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1666 {
1667 if (!snd_seq_queue_check_access(tempo->queue, client))
1668 return -EPERM;
1669 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1670 }
1671
1672 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1673
1674 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1675 void *arg)
1676 {
1677 struct snd_seq_queue_tempo *tempo = arg;
1678 int result;
1679
1680 result = snd_seq_set_queue_tempo(client->number, tempo);
1681 return result < 0 ? result : 0;
1682 }
1683
1684
1685 /* GET_QUEUE_TIMER ioctl() */
1686 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1687 void *arg)
1688 {
1689 struct snd_seq_queue_timer *timer = arg;
1690 struct snd_seq_queue *queue;
1691 struct snd_seq_timer *tmr;
1692
1693 queue = queueptr(timer->queue);
1694 if (queue == NULL)
1695 return -EINVAL;
1696
1697 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1698 queuefree(queue);
1699 return -ERESTARTSYS;
1700 }
1701 tmr = queue->timer;
1702 memset(timer, 0, sizeof(*timer));
1703 timer->queue = queue->queue;
1704
1705 timer->type = tmr->type;
1706 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1707 timer->u.alsa.id = tmr->alsa_id;
1708 timer->u.alsa.resolution = tmr->preferred_resolution;
1709 }
1710 mutex_unlock(&queue->timer_mutex);
1711 queuefree(queue);
1712
1713 return 0;
1714 }
1715
1716
1717 /* SET_QUEUE_TIMER ioctl() */
1718 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1719 void *arg)
1720 {
1721 struct snd_seq_queue_timer *timer = arg;
1722 int result = 0;
1723
1724 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1725 return -EINVAL;
1726
1727 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1728 struct snd_seq_queue *q;
1729 struct snd_seq_timer *tmr;
1730
1731 q = queueptr(timer->queue);
1732 if (q == NULL)
1733 return -ENXIO;
1734 if (mutex_lock_interruptible(&q->timer_mutex)) {
1735 queuefree(q);
1736 return -ERESTARTSYS;
1737 }
1738 tmr = q->timer;
1739 snd_seq_queue_timer_close(timer->queue);
1740 tmr->type = timer->type;
1741 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1742 tmr->alsa_id = timer->u.alsa.id;
1743 tmr->preferred_resolution = timer->u.alsa.resolution;
1744 }
1745 result = snd_seq_queue_timer_open(timer->queue);
1746 mutex_unlock(&q->timer_mutex);
1747 queuefree(q);
1748 } else {
1749 return -EPERM;
1750 }
1751
1752 return result;
1753 }
1754
1755
1756 /* GET_QUEUE_CLIENT ioctl() */
1757 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1758 void *arg)
1759 {
1760 struct snd_seq_queue_client *info = arg;
1761 int used;
1762
1763 used = snd_seq_queue_is_used(info->queue, client->number);
1764 if (used < 0)
1765 return -EINVAL;
1766 info->used = used;
1767 info->client = client->number;
1768
1769 return 0;
1770 }
1771
1772
1773 /* SET_QUEUE_CLIENT ioctl() */
1774 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1775 void *arg)
1776 {
1777 struct snd_seq_queue_client *info = arg;
1778 int err;
1779
1780 if (info->used >= 0) {
1781 err = snd_seq_queue_use(info->queue, client->number, info->used);
1782 if (err < 0)
1783 return err;
1784 }
1785
1786 return snd_seq_ioctl_get_queue_client(client, arg);
1787 }
1788
1789
1790 /* GET_CLIENT_POOL ioctl() */
1791 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1792 void *arg)
1793 {
1794 struct snd_seq_client_pool *info = arg;
1795 struct snd_seq_client *cptr;
1796
1797 cptr = snd_seq_client_use_ptr(info->client);
1798 if (cptr == NULL)
1799 return -ENOENT;
1800 memset(info, 0, sizeof(*info));
1801 info->client = cptr->number;
1802 info->output_pool = cptr->pool->size;
1803 info->output_room = cptr->pool->room;
1804 info->output_free = info->output_pool;
1805 info->output_free = snd_seq_unused_cells(cptr->pool);
1806 if (cptr->type == USER_CLIENT) {
1807 info->input_pool = cptr->data.user.fifo_pool_size;
1808 info->input_free = info->input_pool;
1809 if (cptr->data.user.fifo)
1810 info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1811 } else {
1812 info->input_pool = 0;
1813 info->input_free = 0;
1814 }
1815 snd_seq_client_unlock(cptr);
1816
1817 return 0;
1818 }
1819
1820 /* SET_CLIENT_POOL ioctl() */
1821 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1822 void *arg)
1823 {
1824 struct snd_seq_client_pool *info = arg;
1825 int rc;
1826
1827 if (client->number != info->client)
1828 return -EINVAL; /* can't change other clients */
1829
1830 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1831 (! snd_seq_write_pool_allocated(client) ||
1832 info->output_pool != client->pool->size)) {
1833 if (snd_seq_write_pool_allocated(client)) {
1834 /* remove all existing cells */
1835 snd_seq_pool_mark_closing(client->pool);
1836 snd_seq_queue_client_leave_cells(client->number);
1837 snd_seq_pool_done(client->pool);
1838 }
1839 client->pool->size = info->output_pool;
1840 rc = snd_seq_pool_init(client->pool);
1841 if (rc < 0)
1842 return rc;
1843 }
1844 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1845 info->input_pool >= 1 &&
1846 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1847 info->input_pool != client->data.user.fifo_pool_size) {
1848 /* change pool size */
1849 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1850 if (rc < 0)
1851 return rc;
1852 client->data.user.fifo_pool_size = info->input_pool;
1853 }
1854 if (info->output_room >= 1 &&
1855 info->output_room <= client->pool->size) {
1856 client->pool->room = info->output_room;
1857 }
1858
1859 return snd_seq_ioctl_get_client_pool(client, arg);
1860 }
1861
1862
1863 /* REMOVE_EVENTS ioctl() */
1864 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1865 void *arg)
1866 {
1867 struct snd_seq_remove_events *info = arg;
1868
1869 /*
1870 * Input mostly not implemented XXX.
1871 */
1872 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1873 /*
1874 * No restrictions so for a user client we can clear
1875 * the whole fifo
1876 */
1877 if (client->type == USER_CLIENT && client->data.user.fifo)
1878 snd_seq_fifo_clear(client->data.user.fifo);
1879 }
1880
1881 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1882 snd_seq_queue_remove_cells(client->number, info);
1883
1884 return 0;
1885 }
1886
1887
1888 /*
1889 * get subscription info
1890 */
1891 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1892 void *arg)
1893 {
1894 struct snd_seq_port_subscribe *subs = arg;
1895 int result;
1896 struct snd_seq_client *sender = NULL;
1897 struct snd_seq_client_port *sport = NULL;
1898 struct snd_seq_subscribers *p;
1899
1900 result = -EINVAL;
1901 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1902 goto __end;
1903 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1904 goto __end;
1905 p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1906 if (p) {
1907 result = 0;
1908 *subs = p->info;
1909 } else
1910 result = -ENOENT;
1911
1912 __end:
1913 if (sport)
1914 snd_seq_port_unlock(sport);
1915 if (sender)
1916 snd_seq_client_unlock(sender);
1917
1918 return result;
1919 }
1920
1921
1922 /*
1923 * get subscription info - check only its presence
1924 */
1925 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1926 {
1927 struct snd_seq_query_subs *subs = arg;
1928 int result = -ENXIO;
1929 struct snd_seq_client *cptr = NULL;
1930 struct snd_seq_client_port *port = NULL;
1931 struct snd_seq_port_subs_info *group;
1932 struct list_head *p;
1933 int i;
1934
1935 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1936 goto __end;
1937 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1938 goto __end;
1939
1940 switch (subs->type) {
1941 case SNDRV_SEQ_QUERY_SUBS_READ:
1942 group = &port->c_src;
1943 break;
1944 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1945 group = &port->c_dest;
1946 break;
1947 default:
1948 goto __end;
1949 }
1950
1951 down_read(&group->list_mutex);
1952 /* search for the subscriber */
1953 subs->num_subs = group->count;
1954 i = 0;
1955 result = -ENOENT;
1956 list_for_each(p, &group->list_head) {
1957 if (i++ == subs->index) {
1958 /* found! */
1959 struct snd_seq_subscribers *s;
1960 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1961 s = list_entry(p, struct snd_seq_subscribers, src_list);
1962 subs->addr = s->info.dest;
1963 } else {
1964 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1965 subs->addr = s->info.sender;
1966 }
1967 subs->flags = s->info.flags;
1968 subs->queue = s->info.queue;
1969 result = 0;
1970 break;
1971 }
1972 }
1973 up_read(&group->list_mutex);
1974
1975 __end:
1976 if (port)
1977 snd_seq_port_unlock(port);
1978 if (cptr)
1979 snd_seq_client_unlock(cptr);
1980
1981 return result;
1982 }
1983
1984
1985 /*
1986 * query next client
1987 */
1988 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1989 void *arg)
1990 {
1991 struct snd_seq_client_info *info = arg;
1992 struct snd_seq_client *cptr = NULL;
1993
1994 /* search for next client */
1995 info->client++;
1996 if (info->client < 0)
1997 info->client = 0;
1998 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
1999 cptr = snd_seq_client_use_ptr(info->client);
2000 if (cptr)
2001 break; /* found */
2002 }
2003 if (cptr == NULL)
2004 return -ENOENT;
2005
2006 get_client_info(cptr, info);
2007 snd_seq_client_unlock(cptr);
2008
2009 return 0;
2010 }
2011
2012 /*
2013 * query next port
2014 */
2015 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2016 void *arg)
2017 {
2018 struct snd_seq_port_info *info = arg;
2019 struct snd_seq_client *cptr;
2020 struct snd_seq_client_port *port = NULL;
2021
2022 cptr = snd_seq_client_use_ptr(info->addr.client);
2023 if (cptr == NULL)
2024 return -ENXIO;
2025
2026 /* search for next port */
2027 info->addr.port++;
2028 port = snd_seq_port_query_nearest(cptr, info);
2029 if (port == NULL) {
2030 snd_seq_client_unlock(cptr);
2031 return -ENOENT;
2032 }
2033
2034 /* get port info */
2035 info->addr = port->addr;
2036 snd_seq_get_port_info(port, info);
2037 snd_seq_port_unlock(port);
2038 snd_seq_client_unlock(cptr);
2039
2040 return 0;
2041 }
2042
2043 /* -------------------------------------------------------- */
2044
2045 static const struct ioctl_handler {
2046 unsigned int cmd;
2047 int (*func)(struct snd_seq_client *client, void *arg);
2048 } ioctl_handlers[] = {
2049 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2050 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2051 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2052 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2053 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2054 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2055 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2056 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2057 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2058 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2059 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2060 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2061 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2062 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2063 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2064 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2065 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2066 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2067 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2068 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2069 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2070 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2071 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2072 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2073 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2074 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2075 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2076 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2077 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2078 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2079 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2080 { 0, NULL },
2081 };
2082
2083 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2084 unsigned long arg)
2085 {
2086 struct snd_seq_client *client = file->private_data;
2087 /* To use kernel stack for ioctl data. */
2088 union {
2089 int pversion;
2090 int client_id;
2091 struct snd_seq_system_info system_info;
2092 struct snd_seq_running_info running_info;
2093 struct snd_seq_client_info client_info;
2094 struct snd_seq_port_info port_info;
2095 struct snd_seq_port_subscribe port_subscribe;
2096 struct snd_seq_queue_info queue_info;
2097 struct snd_seq_queue_status queue_status;
2098 struct snd_seq_queue_tempo tempo;
2099 struct snd_seq_queue_timer queue_timer;
2100 struct snd_seq_queue_client queue_client;
2101 struct snd_seq_client_pool client_pool;
2102 struct snd_seq_remove_events remove_events;
2103 struct snd_seq_query_subs query_subs;
2104 } buf;
2105 const struct ioctl_handler *handler;
2106 unsigned long size;
2107 int err;
2108
2109 if (snd_BUG_ON(!client))
2110 return -ENXIO;
2111
2112 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2113 if (handler->cmd == cmd)
2114 break;
2115 }
2116 if (handler->cmd == 0)
2117 return -ENOTTY;
2118
2119 memset(&buf, 0, sizeof(buf));
2120
2121 /*
2122 * All of ioctl commands for ALSA sequencer get an argument of size
2123 * within 13 bits. We can safely pick up the size from the command.
2124 */
2125 size = _IOC_SIZE(handler->cmd);
2126 if (handler->cmd & IOC_IN) {
2127 if (copy_from_user(&buf, (const void __user *)arg, size))
2128 return -EFAULT;
2129 }
2130
2131 err = handler->func(client, &buf);
2132 if (err >= 0) {
2133 /* Some commands includes a bug in 'dir' field. */
2134 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2135 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2136 (handler->cmd & IOC_OUT))
2137 if (copy_to_user((void __user *)arg, &buf, size))
2138 return -EFAULT;
2139 }
2140
2141 return err;
2142 }
2143
2144 #ifdef CONFIG_COMPAT
2145 #include "seq_compat.c"
2146 #else
2147 #define snd_seq_ioctl_compat NULL
2148 #endif
2149
2150 /* -------------------------------------------------------- */
2151
2152
2153 /* exported to kernel modules */
2154 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2155 const char *name_fmt, ...)
2156 {
2157 struct snd_seq_client *client;
2158 va_list args;
2159
2160 if (snd_BUG_ON(in_interrupt()))
2161 return -EBUSY;
2162
2163 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2164 return -EINVAL;
2165 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2166 return -EINVAL;
2167
2168 if (mutex_lock_interruptible(&register_mutex))
2169 return -ERESTARTSYS;
2170
2171 if (card) {
2172 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2173 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2174 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2175 client_index = -1;
2176 }
2177
2178 /* empty write queue as default */
2179 client = seq_create_client1(client_index, 0);
2180 if (client == NULL) {
2181 mutex_unlock(&register_mutex);
2182 return -EBUSY; /* failure code */
2183 }
2184 usage_alloc(&client_usage, 1);
2185
2186 client->accept_input = 1;
2187 client->accept_output = 1;
2188 client->data.kernel.card = card;
2189
2190 va_start(args, name_fmt);
2191 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2192 va_end(args);
2193
2194 client->type = KERNEL_CLIENT;
2195 mutex_unlock(&register_mutex);
2196
2197 /* make others aware this new client */
2198 snd_seq_system_client_ev_client_start(client->number);
2199
2200 /* return client number to caller */
2201 return client->number;
2202 }
2203
2204 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2205
2206 /* exported to kernel modules */
2207 int snd_seq_delete_kernel_client(int client)
2208 {
2209 struct snd_seq_client *ptr;
2210
2211 if (snd_BUG_ON(in_interrupt()))
2212 return -EBUSY;
2213
2214 ptr = clientptr(client);
2215 if (ptr == NULL)
2216 return -EINVAL;
2217
2218 seq_free_client(ptr);
2219 kfree(ptr);
2220 return 0;
2221 }
2222
2223 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2224
2225 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2226 * and snd_seq_kernel_client_enqueue_blocking
2227 */
2228 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2229 struct file *file, int blocking,
2230 int atomic, int hop)
2231 {
2232 struct snd_seq_client *cptr;
2233 int result;
2234
2235 if (snd_BUG_ON(!ev))
2236 return -EINVAL;
2237
2238 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2239 return 0; /* ignore this */
2240 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2241 return -EINVAL; /* quoted events can't be enqueued */
2242
2243 /* fill in client number */
2244 ev->source.client = client;
2245
2246 if (check_event_type_and_length(ev))
2247 return -EINVAL;
2248
2249 cptr = snd_seq_client_use_ptr(client);
2250 if (cptr == NULL)
2251 return -EINVAL;
2252
2253 if (! cptr->accept_output)
2254 result = -EPERM;
2255 else /* send it */
2256 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2257
2258 snd_seq_client_unlock(cptr);
2259 return result;
2260 }
2261
2262 /*
2263 * exported, called by kernel clients to enqueue events (w/o blocking)
2264 *
2265 * RETURN VALUE: zero if succeed, negative if error
2266 */
2267 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2268 int atomic, int hop)
2269 {
2270 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2271 }
2272
2273 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2274
2275 /*
2276 * exported, called by kernel clients to enqueue events (with blocking)
2277 *
2278 * RETURN VALUE: zero if succeed, negative if error
2279 */
2280 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2281 struct file *file,
2282 int atomic, int hop)
2283 {
2284 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2285 }
2286
2287 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2288
2289 /*
2290 * exported, called by kernel clients to dispatch events directly to other
2291 * clients, bypassing the queues. Event time-stamp will be updated.
2292 *
2293 * RETURN VALUE: negative = delivery failed,
2294 * zero, or positive: the number of delivered events
2295 */
2296 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2297 int atomic, int hop)
2298 {
2299 struct snd_seq_client *cptr;
2300 int result;
2301
2302 if (snd_BUG_ON(!ev))
2303 return -EINVAL;
2304
2305 /* fill in client number */
2306 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2307 ev->source.client = client;
2308
2309 if (check_event_type_and_length(ev))
2310 return -EINVAL;
2311
2312 cptr = snd_seq_client_use_ptr(client);
2313 if (cptr == NULL)
2314 return -EINVAL;
2315
2316 if (!cptr->accept_output)
2317 result = -EPERM;
2318 else
2319 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2320
2321 snd_seq_client_unlock(cptr);
2322 return result;
2323 }
2324
2325 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2326
2327 /**
2328 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2329 * kernel space.
2330 * @clientid: A numerical ID for a client.
2331 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2332 * @arg: A pointer to data in kernel space.
2333 *
2334 * Against its name, both kernel/application client can be handled by this
2335 * kernel API. A pointer of 'arg' argument should be in kernel space.
2336 *
2337 * Return: 0 at success. Negative error code at failure.
2338 */
2339 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2340 {
2341 const struct ioctl_handler *handler;
2342 struct snd_seq_client *client;
2343
2344 client = clientptr(clientid);
2345 if (client == NULL)
2346 return -ENXIO;
2347
2348 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2349 if (handler->cmd == cmd)
2350 return handler->func(client, arg);
2351 }
2352
2353 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2354 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2355 return -ENOTTY;
2356 }
2357
2358 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2359
2360 /* exported (for OSS emulator) */
2361 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2362 {
2363 struct snd_seq_client *client;
2364
2365 client = clientptr(clientid);
2366 if (client == NULL)
2367 return -ENXIO;
2368
2369 if (! snd_seq_write_pool_allocated(client))
2370 return 1;
2371 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2372 return 1;
2373 return 0;
2374 }
2375
2376 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2377
2378 /*---------------------------------------------------------------------------*/
2379
2380 #ifdef CONFIG_SND_PROC_FS
2381 /*
2382 * /proc interface
2383 */
2384 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2385 struct snd_seq_port_subs_info *group,
2386 int is_src, char *msg)
2387 {
2388 struct list_head *p;
2389 struct snd_seq_subscribers *s;
2390 int count = 0;
2391
2392 down_read(&group->list_mutex);
2393 if (list_empty(&group->list_head)) {
2394 up_read(&group->list_mutex);
2395 return;
2396 }
2397 snd_iprintf(buffer, msg);
2398 list_for_each(p, &group->list_head) {
2399 if (is_src)
2400 s = list_entry(p, struct snd_seq_subscribers, src_list);
2401 else
2402 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2403 if (count++)
2404 snd_iprintf(buffer, ", ");
2405 snd_iprintf(buffer, "%d:%d",
2406 is_src ? s->info.dest.client : s->info.sender.client,
2407 is_src ? s->info.dest.port : s->info.sender.port);
2408 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2409 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2410 if (group->exclusive)
2411 snd_iprintf(buffer, "[ex]");
2412 }
2413 up_read(&group->list_mutex);
2414 snd_iprintf(buffer, "\n");
2415 }
2416
2417 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2418 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2419 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2420
2421 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2422
2423 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2424 struct snd_seq_client *client)
2425 {
2426 struct snd_seq_client_port *p;
2427
2428 mutex_lock(&client->ports_mutex);
2429 list_for_each_entry(p, &client->ports_list_head, list) {
2430 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2431 p->addr.port, p->name,
2432 FLAG_PERM_RD(p->capability),
2433 FLAG_PERM_WR(p->capability),
2434 FLAG_PERM_EX(p->capability),
2435 FLAG_PERM_DUPLEX(p->capability));
2436 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2437 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2438 }
2439 mutex_unlock(&client->ports_mutex);
2440 }
2441
2442
2443 /* exported to seq_info.c */
2444 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2445 struct snd_info_buffer *buffer)
2446 {
2447 int c;
2448 struct snd_seq_client *client;
2449
2450 snd_iprintf(buffer, "Client info\n");
2451 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2452 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2453 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2454 snd_iprintf(buffer, "\n");
2455
2456 /* list the client table */
2457 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2458 client = snd_seq_client_use_ptr(c);
2459 if (client == NULL)
2460 continue;
2461 if (client->type == NO_CLIENT) {
2462 snd_seq_client_unlock(client);
2463 continue;
2464 }
2465
2466 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2467 c, client->name,
2468 client->type == USER_CLIENT ? "User" : "Kernel");
2469 snd_seq_info_dump_ports(buffer, client);
2470 if (snd_seq_write_pool_allocated(client)) {
2471 snd_iprintf(buffer, " Output pool :\n");
2472 snd_seq_info_pool(buffer, client->pool, " ");
2473 }
2474 if (client->type == USER_CLIENT && client->data.user.fifo &&
2475 client->data.user.fifo->pool) {
2476 snd_iprintf(buffer, " Input pool :\n");
2477 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2478 }
2479 snd_seq_client_unlock(client);
2480 }
2481 }
2482 #endif /* CONFIG_SND_PROC_FS */
2483
2484 /*---------------------------------------------------------------------------*/
2485
2486
2487 /*
2488 * REGISTRATION PART
2489 */
2490
2491 static const struct file_operations snd_seq_f_ops =
2492 {
2493 .owner = THIS_MODULE,
2494 .read = snd_seq_read,
2495 .write = snd_seq_write,
2496 .open = snd_seq_open,
2497 .release = snd_seq_release,
2498 .llseek = no_llseek,
2499 .poll = snd_seq_poll,
2500 .unlocked_ioctl = snd_seq_ioctl,
2501 .compat_ioctl = snd_seq_ioctl_compat,
2502 };
2503
2504 static struct device seq_dev;
2505
2506 /*
2507 * register sequencer device
2508 */
2509 int __init snd_sequencer_device_init(void)
2510 {
2511 int err;
2512
2513 snd_device_initialize(&seq_dev, NULL);
2514 dev_set_name(&seq_dev, "seq");
2515
2516 if (mutex_lock_interruptible(&register_mutex))
2517 return -ERESTARTSYS;
2518
2519 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2520 &snd_seq_f_ops, NULL, &seq_dev);
2521 if (err < 0) {
2522 mutex_unlock(&register_mutex);
2523 put_device(&seq_dev);
2524 return err;
2525 }
2526
2527 mutex_unlock(&register_mutex);
2528
2529 return 0;
2530 }
2531
2532
2533
2534 /*
2535 * unregister sequencer device
2536 */
2537 void __exit snd_sequencer_device_done(void)
2538 {
2539 snd_unregister_device(&seq_dev);
2540 put_device(&seq_dev);
2541 }
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