1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ALSA sequencer Client Manager
4 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
5 * Jaroslav Kysela <perex@perex.cz>
6 * Takashi Iwai <tiwai@suse.de>
7 */
8
9 #include <linux/init.h>
10 #include <linux/export.h>
11 #include <linux/slab.h>
12 #include <sound/core.h>
13 #include <sound/minors.h>
14 #include <linux/kmod.h>
15
16 #include <sound/seq_kernel.h>
17 #include <sound/ump.h>
18 #include "seq_clientmgr.h"
19 #include "seq_memory.h"
20 #include "seq_queue.h"
21 #include "seq_timer.h"
22 #include "seq_info.h"
23 #include "seq_system.h"
24 #include "seq_ump_convert.h"
25 #include <sound/seq_device.h>
26 #ifdef CONFIG_COMPAT
27 #include <linux/compat.h>
28 #endif
29
30 /* Client Manager
31
32 * this module handles the connections of userland and kernel clients
33 *
34 */
35
36 /*
37 * There are four ranges of client numbers (last two shared):
38 * 0..15: global clients
39 * 16..127: statically allocated client numbers for cards 0..27
40 * 128..191: dynamically allocated client numbers for cards 28..31
41 * 128..191: dynamically allocated client numbers for applications
42 */
43
44 /* number of kernel non-card clients */
45 #define SNDRV_SEQ_GLOBAL_CLIENTS 16
46 /* clients per cards, for static clients */
47 #define SNDRV_SEQ_CLIENTS_PER_CARD 4
48 /* dynamically allocated client numbers (both kernel drivers and user space) */
49 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
50
51 #define SNDRV_SEQ_LFLG_INPUT 0x0001
52 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
53 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
54
55 static DEFINE_SPINLOCK(clients_lock);
56 static DEFINE_MUTEX(register_mutex);
57
58 /*
59 * client table
60 */
61 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
62 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
63 static struct snd_seq_usage client_usage;
64
65 /*
66 * prototypes
67 */
68 static int bounce_error_event(struct snd_seq_client *client,
69 struct snd_seq_event *event,
70 int err, int atomic, int hop);
71 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
72 struct snd_seq_event *event,
73 int filter, int atomic, int hop);
74
75 #if IS_ENABLED(CONFIG_SND_SEQ_UMP)
76 static void free_ump_info(struct snd_seq_client *client);
77 #endif
78
79 /*
80 */
81 static inline unsigned short snd_seq_file_flags(struct file *file)
82 {
83 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
84 case FMODE_WRITE:
85 return SNDRV_SEQ_LFLG_OUTPUT;
86 case FMODE_READ:
87 return SNDRV_SEQ_LFLG_INPUT;
88 default:
89 return SNDRV_SEQ_LFLG_OPEN;
90 }
91 }
92
93 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
94 {
95 return snd_seq_total_cells(client->pool) > 0;
96 }
97
98 /* return pointer to client structure for specified id */
99 static struct snd_seq_client *clientptr(int clientid)
100 {
101 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
102 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
103 clientid);
104 return NULL;
105 }
106 return clienttab[clientid];
107 }
108
109 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
110 {
111 unsigned long flags;
112 struct snd_seq_client *client;
113
114 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
115 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
116 clientid);
117 return NULL;
118 }
119 spin_lock_irqsave(&clients_lock, flags);
120 client = clientptr(clientid);
121 if (client)
122 goto __lock;
123 if (clienttablock[clientid]) {
124 spin_unlock_irqrestore(&clients_lock, flags);
125 return NULL;
126 }
127 spin_unlock_irqrestore(&clients_lock, flags);
128 #ifdef CONFIG_MODULES
129 if (!in_interrupt()) {
130 static DECLARE_BITMAP(client_requested, SNDRV_SEQ_GLOBAL_CLIENTS);
131 static DECLARE_BITMAP(card_requested, SNDRV_CARDS);
132
133 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
134 int idx;
135
136 if (!test_and_set_bit(clientid, client_requested)) {
137 for (idx = 0; idx < 15; idx++) {
138 if (seq_client_load[idx] < 0)
139 break;
140 if (seq_client_load[idx] == clientid) {
141 request_module("snd-seq-client-%i",
142 clientid);
143 break;
144 }
145 }
146 }
147 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
148 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
149 SNDRV_SEQ_CLIENTS_PER_CARD;
150 if (card < snd_ecards_limit) {
151 if (!test_and_set_bit(card, card_requested))
152 snd_request_card(card);
153 snd_seq_device_load_drivers();
154 }
155 }
156 spin_lock_irqsave(&clients_lock, flags);
157 client = clientptr(clientid);
158 if (client)
159 goto __lock;
160 spin_unlock_irqrestore(&clients_lock, flags);
161 }
162 #endif
163 return NULL;
164
165 __lock:
166 snd_use_lock_use(&client->use_lock);
167 spin_unlock_irqrestore(&clients_lock, flags);
168 return client;
169 }
170
171 /* Take refcount and perform ioctl_mutex lock on the given client;
172 * used only for OSS sequencer
173 * Unlock via snd_seq_client_ioctl_unlock() below
174 */
175 bool snd_seq_client_ioctl_lock(int clientid)
176 {
177 struct snd_seq_client *client;
178
179 client = snd_seq_client_use_ptr(clientid);
180 if (!client)
181 return false;
182 mutex_lock(&client->ioctl_mutex);
183 /* The client isn't unrefed here; see snd_seq_client_ioctl_unlock() */
184 return true;
185 }
186 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_lock);
187
188 /* Unlock and unref the given client; for OSS sequencer use only */
189 void snd_seq_client_ioctl_unlock(int clientid)
190 {
191 struct snd_seq_client *client;
192
193 client = snd_seq_client_use_ptr(clientid);
194 if (WARN_ON(!client))
195 return;
196 mutex_unlock(&client->ioctl_mutex);
197 /* The doubly unrefs below are intentional; the first one releases the
198 * leftover from snd_seq_client_ioctl_lock() above, and the second one
199 * is for releasing snd_seq_client_use_ptr() in this function
200 */
201 snd_seq_client_unlock(client);
202 snd_seq_client_unlock(client);
203 }
204 EXPORT_SYMBOL_GPL(snd_seq_client_ioctl_unlock);
205
206 static void usage_alloc(struct snd_seq_usage *res, int num)
207 {
208 res->cur += num;
209 if (res->cur > res->peak)
210 res->peak = res->cur;
211 }
212
213 static void usage_free(struct snd_seq_usage *res, int num)
214 {
215 res->cur -= num;
216 }
217
218 /* initialise data structures */
219 int __init client_init_data(void)
220 {
221 /* zap out the client table */
222 memset(&clienttablock, 0, sizeof(clienttablock));
223 memset(&clienttab, 0, sizeof(clienttab));
224 return 0;
225 }
226
227
228 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
229 {
230 int c;
231 struct snd_seq_client *client;
232
233 /* init client data */
234 client = kzalloc(sizeof(*client), GFP_KERNEL);
235 if (client == NULL)
236 return NULL;
237 client->pool = snd_seq_pool_new(poolsize);
238 if (client->pool == NULL) {
239 kfree(client);
240 return NULL;
241 }
242 client->type = NO_CLIENT;
243 snd_use_lock_init(&client->use_lock);
244 rwlock_init(&client->ports_lock);
245 mutex_init(&client->ports_mutex);
246 INIT_LIST_HEAD(&client->ports_list_head);
247 mutex_init(&client->ioctl_mutex);
248 client->ump_endpoint_port = -1;
249
250 /* find free slot in the client table */
251 spin_lock_irq(&clients_lock);
252 if (client_index < 0) {
253 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
254 c < SNDRV_SEQ_MAX_CLIENTS;
255 c++) {
256 if (clienttab[c] || clienttablock[c])
257 continue;
258 clienttab[client->number = c] = client;
259 spin_unlock_irq(&clients_lock);
260 return client;
261 }
262 } else {
263 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
264 clienttab[client->number = client_index] = client;
265 spin_unlock_irq(&clients_lock);
266 return client;
267 }
268 }
269 spin_unlock_irq(&clients_lock);
270 snd_seq_pool_delete(&client->pool);
271 kfree(client);
272 return NULL; /* no free slot found or busy, return failure code */
273 }
274
275
276 static int seq_free_client1(struct snd_seq_client *client)
277 {
278 if (!client)
279 return 0;
280 spin_lock_irq(&clients_lock);
281 clienttablock[client->number] = 1;
282 clienttab[client->number] = NULL;
283 spin_unlock_irq(&clients_lock);
284 snd_seq_delete_all_ports(client);
285 snd_seq_queue_client_leave(client->number);
286 snd_use_lock_sync(&client->use_lock);
287 if (client->pool)
288 snd_seq_pool_delete(&client->pool);
289 spin_lock_irq(&clients_lock);
290 clienttablock[client->number] = 0;
291 spin_unlock_irq(&clients_lock);
292 return 0;
293 }
294
295
296 static void seq_free_client(struct snd_seq_client * client)
297 {
298 mutex_lock(®ister_mutex);
299 switch (client->type) {
300 case NO_CLIENT:
301 pr_warn("ALSA: seq: Trying to free unused client %d\n",
302 client->number);
303 break;
304 case USER_CLIENT:
305 case KERNEL_CLIENT:
306 seq_free_client1(client);
307 usage_free(&client_usage, 1);
308 break;
309
310 default:
311 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
312 client->number, client->type);
313 }
314 mutex_unlock(®ister_mutex);
315
316 snd_seq_system_client_ev_client_exit(client->number);
317 }
318
319
320
321 /* -------------------------------------------------------- */
322
323 /* create a user client */
324 static int snd_seq_open(struct inode *inode, struct file *file)
325 {
326 int c, mode; /* client id */
327 struct snd_seq_client *client;
328 struct snd_seq_user_client *user;
329 int err;
330
331 err = stream_open(inode, file);
332 if (err < 0)
333 return err;
334
335 mutex_lock(®ister_mutex);
336 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
337 if (!client) {
338 mutex_unlock(®ister_mutex);
339 return -ENOMEM; /* failure code */
340 }
341
342 mode = snd_seq_file_flags(file);
343 if (mode & SNDRV_SEQ_LFLG_INPUT)
344 client->accept_input = 1;
345 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
346 client->accept_output = 1;
347
348 user = &client->data.user;
349 user->fifo = NULL;
350 user->fifo_pool_size = 0;
351
352 if (mode & SNDRV_SEQ_LFLG_INPUT) {
353 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
354 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
355 if (user->fifo == NULL) {
356 seq_free_client1(client);
357 kfree(client);
358 mutex_unlock(®ister_mutex);
359 return -ENOMEM;
360 }
361 }
362
363 usage_alloc(&client_usage, 1);
364 client->type = USER_CLIENT;
365 mutex_unlock(®ister_mutex);
366
367 c = client->number;
368 file->private_data = client;
369
370 /* fill client data */
371 user->file = file;
372 sprintf(client->name, "Client-%d", c);
373 client->data.user.owner = get_pid(task_pid(current));
374
375 /* make others aware this new client */
376 snd_seq_system_client_ev_client_start(c);
377
378 return 0;
379 }
380
381 /* delete a user client */
382 static int snd_seq_release(struct inode *inode, struct file *file)
383 {
384 struct snd_seq_client *client = file->private_data;
385
386 if (client) {
387 seq_free_client(client);
388 if (client->data.user.fifo)
389 snd_seq_fifo_delete(&client->data.user.fifo);
390 #if IS_ENABLED(CONFIG_SND_SEQ_UMP)
391 free_ump_info(client);
392 #endif
393 put_pid(client->data.user.owner);
394 kfree(client);
395 }
396
397 return 0;
398 }
399
400 static bool event_is_compatible(const struct snd_seq_client *client,
401 const struct snd_seq_event *ev)
402 {
403 if (snd_seq_ev_is_ump(ev) && !client->midi_version)
404 return false;
405 if (snd_seq_ev_is_ump(ev) && snd_seq_ev_is_variable(ev))
406 return false;
407 return true;
408 }
409
410 /* handle client read() */
411 /* possible error values:
412 * -ENXIO invalid client or file open mode
413 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
414 * -EINVAL no enough user-space buffer to write the whole event
415 * -EFAULT seg. fault during copy to user space
416 */
417 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
418 loff_t *offset)
419 {
420 struct snd_seq_client *client = file->private_data;
421 struct snd_seq_fifo *fifo;
422 size_t aligned_size;
423 int err;
424 long result = 0;
425 struct snd_seq_event_cell *cell;
426
427 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
428 return -ENXIO;
429
430 if (!access_ok(buf, count))
431 return -EFAULT;
432
433 /* check client structures are in place */
434 if (snd_BUG_ON(!client))
435 return -ENXIO;
436
437 if (!client->accept_input)
438 return -ENXIO;
439 fifo = client->data.user.fifo;
440 if (!fifo)
441 return -ENXIO;
442
443 if (atomic_read(&fifo->overflow) > 0) {
444 /* buffer overflow is detected */
445 snd_seq_fifo_clear(fifo);
446 /* return error code */
447 return -ENOSPC;
448 }
449
450 cell = NULL;
451 err = 0;
452 snd_seq_fifo_lock(fifo);
453
454 if (IS_ENABLED(CONFIG_SND_SEQ_UMP) && client->midi_version > 0)
455 aligned_size = sizeof(struct snd_seq_ump_event);
456 else
457 aligned_size = sizeof(struct snd_seq_event);
458
459 /* while data available in queue */
460 while (count >= aligned_size) {
461 int nonblock;
462
463 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
464 err = snd_seq_fifo_cell_out(fifo, &cell, nonblock);
465 if (err < 0)
466 break;
467 if (!event_is_compatible(client, &cell->event)) {
468 snd_seq_cell_free(cell);
469 cell = NULL;
470 continue;
471 }
472 if (snd_seq_ev_is_variable(&cell->event)) {
473 struct snd_seq_ump_event tmpev;
474
475 memcpy(&tmpev, &cell->event, aligned_size);
476 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
477 if (copy_to_user(buf, &tmpev, aligned_size)) {
478 err = -EFAULT;
479 break;
480 }
481 count -= aligned_size;
482 buf += aligned_size;
483 err = snd_seq_expand_var_event(&cell->event, count,
484 (char __force *)buf, 0,
485 aligned_size);
486 if (err < 0)
487 break;
488 result += err;
489 count -= err;
490 buf += err;
491 } else {
492 if (copy_to_user(buf, &cell->event, aligned_size)) {
493 err = -EFAULT;
494 break;
495 }
496 count -= aligned_size;
497 buf += aligned_size;
498 }
499 snd_seq_cell_free(cell);
500 cell = NULL; /* to be sure */
501 result += aligned_size;
502 }
503
504 if (err < 0) {
505 if (cell)
506 snd_seq_fifo_cell_putback(fifo, cell);
507 if (err == -EAGAIN && result > 0)
508 err = 0;
509 }
510 snd_seq_fifo_unlock(fifo);
511
512 return (err < 0) ? err : result;
513 }
514
515
516 /*
517 * check access permission to the port
518 */
519 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
520 {
521 if ((port->capability & flags) != flags)
522 return 0;
523 return flags;
524 }
525
526 /*
527 * check if the destination client is available, and return the pointer
528 * if filter is non-zero, client filter bitmap is tested.
529 */
530 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
531 int filter)
532 {
533 struct snd_seq_client *dest;
534
535 dest = snd_seq_client_use_ptr(event->dest.client);
536 if (dest == NULL)
537 return NULL;
538 if (! dest->accept_input)
539 goto __not_avail;
540 if (snd_seq_ev_is_ump(event))
541 return dest; /* ok - no filter checks */
542
543 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
544 ! test_bit(event->type, dest->event_filter))
545 goto __not_avail;
546 if (filter && !(dest->filter & filter))
547 goto __not_avail;
548
549 return dest; /* ok - accessible */
550 __not_avail:
551 snd_seq_client_unlock(dest);
552 return NULL;
553 }
554
555
556 /*
557 * Return the error event.
558 *
559 * If the receiver client is a user client, the original event is
560 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
561 * the original event is also variable length, the external data is
562 * copied after the event record.
563 * If the receiver client is a kernel client, the original event is
564 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
565 * kmalloc.
566 */
567 static int bounce_error_event(struct snd_seq_client *client,
568 struct snd_seq_event *event,
569 int err, int atomic, int hop)
570 {
571 struct snd_seq_event bounce_ev;
572 int result;
573
574 if (client == NULL ||
575 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
576 ! client->accept_input)
577 return 0; /* ignored */
578
579 /* set up quoted error */
580 memset(&bounce_ev, 0, sizeof(bounce_ev));
581 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
582 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
583 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
584 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
585 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
586 bounce_ev.dest.client = client->number;
587 bounce_ev.dest.port = event->source.port;
588 bounce_ev.data.quote.origin = event->dest;
589 bounce_ev.data.quote.event = event;
590 bounce_ev.data.quote.value = -err; /* use positive value */
591 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
592 if (result < 0) {
593 client->event_lost++;
594 return result;
595 }
596
597 return result;
598 }
599
600
601 /*
602 * rewrite the time-stamp of the event record with the curren time
603 * of the given queue.
604 * return non-zero if updated.
605 */
606 static int update_timestamp_of_queue(struct snd_seq_event *event,
607 int queue, int real_time)
608 {
609 struct snd_seq_queue *q;
610
611 q = queueptr(queue);
612 if (! q)
613 return 0;
614 event->queue = queue;
615 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
616 if (real_time) {
617 event->time.time = snd_seq_timer_get_cur_time(q->timer, true);
618 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
619 } else {
620 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
621 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
622 }
623 queuefree(q);
624 return 1;
625 }
626
627 /* deliver a single event; called from below and UMP converter */
628 int __snd_seq_deliver_single_event(struct snd_seq_client *dest,
629 struct snd_seq_client_port *dest_port,
630 struct snd_seq_event *event,
631 int atomic, int hop)
632 {
633 switch (dest->type) {
634 case USER_CLIENT:
635 if (!dest->data.user.fifo)
636 return 0;
637 return snd_seq_fifo_event_in(dest->data.user.fifo, event);
638 case KERNEL_CLIENT:
639 if (!dest_port->event_input)
640 return 0;
641 return dest_port->event_input(event,
642 snd_seq_ev_is_direct(event),
643 dest_port->private_data,
644 atomic, hop);
645 }
646 return 0;
647 }
648
649 /*
650 * deliver an event to the specified destination.
651 * if filter is non-zero, client filter bitmap is tested.
652 *
653 * RETURN VALUE: 0 : if succeeded
654 * <0 : error
655 */
656 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
657 struct snd_seq_event *event,
658 int filter, int atomic, int hop)
659 {
660 struct snd_seq_client *dest = NULL;
661 struct snd_seq_client_port *dest_port = NULL;
662 int result = -ENOENT;
663 int direct;
664
665 direct = snd_seq_ev_is_direct(event);
666
667 dest = get_event_dest_client(event, filter);
668 if (dest == NULL)
669 goto __skip;
670 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
671 if (dest_port == NULL)
672 goto __skip;
673
674 /* check permission */
675 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
676 result = -EPERM;
677 goto __skip;
678 }
679
680 if (dest_port->timestamping)
681 update_timestamp_of_queue(event, dest_port->time_queue,
682 dest_port->time_real);
683
684 #if IS_ENABLED(CONFIG_SND_SEQ_UMP)
685 if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT)) {
686 if (snd_seq_ev_is_ump(event)) {
687 result = snd_seq_deliver_from_ump(client, dest, dest_port,
688 event, atomic, hop);
689 goto __skip;
690 } else if (snd_seq_client_is_ump(dest)) {
691 result = snd_seq_deliver_to_ump(client, dest, dest_port,
692 event, atomic, hop);
693 goto __skip;
694 }
695 }
696 #endif /* CONFIG_SND_SEQ_UMP */
697
698 result = __snd_seq_deliver_single_event(dest, dest_port, event,
699 atomic, hop);
700
701 __skip:
702 if (dest_port)
703 snd_seq_port_unlock(dest_port);
704 if (dest)
705 snd_seq_client_unlock(dest);
706
707 if (result < 0 && !direct) {
708 result = bounce_error_event(client, event, result, atomic, hop);
709 }
710 return result;
711 }
712
713
714 /*
715 * send the event to all subscribers:
716 */
717 static int __deliver_to_subscribers(struct snd_seq_client *client,
718 struct snd_seq_event *event,
719 struct snd_seq_client_port *src_port,
720 int atomic, int hop)
721 {
722 struct snd_seq_subscribers *subs;
723 int err, result = 0, num_ev = 0;
724 union __snd_seq_event event_saved;
725 size_t saved_size;
726 struct snd_seq_port_subs_info *grp;
727
728 /* save original event record */
729 saved_size = snd_seq_event_packet_size(event);
730 memcpy(&event_saved, event, saved_size);
731 grp = &src_port->c_src;
732
733 /* lock list */
734 if (atomic)
735 read_lock(&grp->list_lock);
736 else
737 down_read_nested(&grp->list_mutex, hop);
738 list_for_each_entry(subs, &grp->list_head, src_list) {
739 /* both ports ready? */
740 if (atomic_read(&subs->ref_count) != 2)
741 continue;
742 event->dest = subs->info.dest;
743 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
744 /* convert time according to flag with subscription */
745 update_timestamp_of_queue(event, subs->info.queue,
746 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
747 err = snd_seq_deliver_single_event(client, event,
748 0, atomic, hop);
749 if (err < 0) {
750 /* save first error that occurs and continue */
751 if (!result)
752 result = err;
753 continue;
754 }
755 num_ev++;
756 /* restore original event record */
757 memcpy(event, &event_saved, saved_size);
758 }
759 if (atomic)
760 read_unlock(&grp->list_lock);
761 else
762 up_read(&grp->list_mutex);
763 memcpy(event, &event_saved, saved_size);
764 return (result < 0) ? result : num_ev;
765 }
766
767 static int deliver_to_subscribers(struct snd_seq_client *client,
768 struct snd_seq_event *event,
769 int atomic, int hop)
770 {
771 struct snd_seq_client_port *src_port;
772 int ret = 0, ret2;
773
774 src_port = snd_seq_port_use_ptr(client, event->source.port);
775 if (src_port) {
776 ret = __deliver_to_subscribers(client, event, src_port, atomic, hop);
777 snd_seq_port_unlock(src_port);
778 }
779
780 if (client->ump_endpoint_port < 0 ||
781 event->source.port == client->ump_endpoint_port)
782 return ret;
783
784 src_port = snd_seq_port_use_ptr(client, client->ump_endpoint_port);
785 if (!src_port)
786 return ret;
787 ret2 = __deliver_to_subscribers(client, event, src_port, atomic, hop);
788 snd_seq_port_unlock(src_port);
789 return ret2 < 0 ? ret2 : ret;
790 }
791
792 /* deliver an event to the destination port(s).
793 * if the event is to subscribers or broadcast, the event is dispatched
794 * to multiple targets.
795 *
796 * RETURN VALUE: n > 0 : the number of delivered events.
797 * n == 0 : the event was not passed to any client.
798 * n < 0 : error - event was not processed.
799 */
800 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
801 int atomic, int hop)
802 {
803 int result;
804
805 hop++;
806 if (hop >= SNDRV_SEQ_MAX_HOPS) {
807 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
808 event->source.client, event->source.port,
809 event->dest.client, event->dest.port);
810 return -EMLINK;
811 }
812
813 if (snd_seq_ev_is_variable(event) &&
814 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
815 return -EINVAL;
816
817 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
818 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
819 result = deliver_to_subscribers(client, event, atomic, hop);
820 else
821 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
822
823 return result;
824 }
825
826 /*
827 * dispatch an event cell:
828 * This function is called only from queue check routines in timer
829 * interrupts or after enqueued.
830 * The event cell shall be released or re-queued in this function.
831 *
832 * RETURN VALUE: n > 0 : the number of delivered events.
833 * n == 0 : the event was not passed to any client.
834 * n < 0 : error - event was not processed.
835 */
836 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
837 {
838 struct snd_seq_client *client;
839 int result;
840
841 if (snd_BUG_ON(!cell))
842 return -EINVAL;
843
844 client = snd_seq_client_use_ptr(cell->event.source.client);
845 if (client == NULL) {
846 snd_seq_cell_free(cell); /* release this cell */
847 return -EINVAL;
848 }
849
850 if (!snd_seq_ev_is_ump(&cell->event) &&
851 cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
852 /* NOTE event:
853 * the event cell is re-used as a NOTE-OFF event and
854 * enqueued again.
855 */
856 struct snd_seq_event tmpev, *ev;
857
858 /* reserve this event to enqueue note-off later */
859 tmpev = cell->event;
860 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
861 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
862
863 /*
864 * This was originally a note event. We now re-use the
865 * cell for the note-off event.
866 */
867
868 ev = &cell->event;
869 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
870 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
871
872 /* add the duration time */
873 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
874 case SNDRV_SEQ_TIME_STAMP_TICK:
875 cell->event.time.tick += ev->data.note.duration;
876 break;
877 case SNDRV_SEQ_TIME_STAMP_REAL:
878 /* unit for duration is ms */
879 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
880 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
881 ev->time.time.tv_nsec / 1000000000;
882 ev->time.time.tv_nsec %= 1000000000;
883 break;
884 }
885 ev->data.note.velocity = ev->data.note.off_velocity;
886
887 /* Now queue this cell as the note off event */
888 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
889 snd_seq_cell_free(cell); /* release this cell */
890
891 } else {
892 /* Normal events:
893 * event cell is freed after processing the event
894 */
895
896 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
897 snd_seq_cell_free(cell);
898 }
899
900 snd_seq_client_unlock(client);
901 return result;
902 }
903
904
905 /* Allocate a cell from client pool and enqueue it to queue:
906 * if pool is empty and blocking is TRUE, sleep until a new cell is
907 * available.
908 */
909 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
910 struct snd_seq_event *event,
911 struct file *file, int blocking,
912 int atomic, int hop,
913 struct mutex *mutexp)
914 {
915 struct snd_seq_event_cell *cell;
916 int err;
917
918 /* special queue values - force direct passing */
919 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
920 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
921 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
922 } else if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
923 /* check presence of source port */
924 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
925 if (src_port == NULL)
926 return -EINVAL;
927 snd_seq_port_unlock(src_port);
928 }
929
930 /* direct event processing without enqueued */
931 if (snd_seq_ev_is_direct(event)) {
932 if (!snd_seq_ev_is_ump(event) &&
933 event->type == SNDRV_SEQ_EVENT_NOTE)
934 return -EINVAL; /* this event must be enqueued! */
935 return snd_seq_deliver_event(client, event, atomic, hop);
936 }
937
938 /* Not direct, normal queuing */
939 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
940 return -EINVAL; /* invalid queue */
941 if (! snd_seq_write_pool_allocated(client))
942 return -ENXIO; /* queue is not allocated */
943
944 /* allocate an event cell */
945 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
946 file, mutexp);
947 if (err < 0)
948 return err;
949
950 /* we got a cell. enqueue it. */
951 err = snd_seq_enqueue_event(cell, atomic, hop);
952 if (err < 0) {
953 snd_seq_cell_free(cell);
954 return err;
955 }
956
957 return 0;
958 }
959
960
961 /*
962 * check validity of event type and data length.
963 * return non-zero if invalid.
964 */
965 static int check_event_type_and_length(struct snd_seq_event *ev)
966 {
967 switch (snd_seq_ev_length_type(ev)) {
968 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
969 if (snd_seq_ev_is_variable_type(ev))
970 return -EINVAL;
971 break;
972 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
973 if (! snd_seq_ev_is_variable_type(ev) ||
974 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
975 return -EINVAL;
976 break;
977 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
978 if (! snd_seq_ev_is_direct(ev))
979 return -EINVAL;
980 break;
981 }
982 return 0;
983 }
984
985
986 /* handle write() */
987 /* possible error values:
988 * -ENXIO invalid client or file open mode
989 * -ENOMEM malloc failed
990 * -EFAULT seg. fault during copy from user space
991 * -EINVAL invalid event
992 * -EAGAIN no space in output pool
993 * -EINTR interrupts while sleep
994 * -EMLINK too many hops
995 * others depends on return value from driver callback
996 */
997 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
998 size_t count, loff_t *offset)
999 {
1000 struct snd_seq_client *client = file->private_data;
1001 int written = 0, len;
1002 int err, handled;
1003 union __snd_seq_event __event;
1004 struct snd_seq_event *ev = &__event.legacy;
1005
1006 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1007 return -ENXIO;
1008
1009 /* check client structures are in place */
1010 if (snd_BUG_ON(!client))
1011 return -ENXIO;
1012
1013 if (!client->accept_output || client->pool == NULL)
1014 return -ENXIO;
1015
1016 repeat:
1017 handled = 0;
1018 /* allocate the pool now if the pool is not allocated yet */
1019 mutex_lock(&client->ioctl_mutex);
1020 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1021 err = snd_seq_pool_init(client->pool);
1022 if (err < 0)
1023 goto out;
1024 }
1025
1026 /* only process whole events */
1027 err = -EINVAL;
1028 while (count >= sizeof(struct snd_seq_event)) {
1029 /* Read in the event header from the user */
1030 len = sizeof(struct snd_seq_event);
1031 if (copy_from_user(ev, buf, len)) {
1032 err = -EFAULT;
1033 break;
1034 }
1035 /* read in the rest bytes for UMP events */
1036 if (snd_seq_ev_is_ump(ev)) {
1037 if (count < sizeof(struct snd_seq_ump_event))
1038 break;
1039 if (copy_from_user((char *)ev + len, buf + len,
1040 sizeof(struct snd_seq_ump_event) - len)) {
1041 err = -EFAULT;
1042 break;
1043 }
1044 len = sizeof(struct snd_seq_ump_event);
1045 }
1046
1047 ev->source.client = client->number; /* fill in client number */
1048 /* Check for extension data length */
1049 if (check_event_type_and_length(ev)) {
1050 err = -EINVAL;
1051 break;
1052 }
1053
1054 if (!event_is_compatible(client, ev)) {
1055 err = -EINVAL;
1056 break;
1057 }
1058
1059 /* check for special events */
1060 if (!snd_seq_ev_is_ump(ev)) {
1061 if (ev->type == SNDRV_SEQ_EVENT_NONE)
1062 goto __skip_event;
1063 else if (snd_seq_ev_is_reserved(ev)) {
1064 err = -EINVAL;
1065 break;
1066 }
1067 }
1068
1069 if (snd_seq_ev_is_variable(ev)) {
1070 int extlen = ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1071 if ((size_t)(extlen + len) > count) {
1072 /* back out, will get an error this time or next */
1073 err = -EINVAL;
1074 break;
1075 }
1076 /* set user space pointer */
1077 ev->data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1078 ev->data.ext.ptr = (char __force *)buf + len;
1079 len += extlen; /* increment data length */
1080 } else {
1081 #ifdef CONFIG_COMPAT
1082 if (client->convert32 && snd_seq_ev_is_varusr(ev))
1083 ev->data.ext.ptr =
1084 (void __force *)compat_ptr(ev->data.raw32.d[1]);
1085 #endif
1086 }
1087
1088 /* ok, enqueue it */
1089 err = snd_seq_client_enqueue_event(client, ev, file,
1090 !(file->f_flags & O_NONBLOCK),
1091 0, 0, &client->ioctl_mutex);
1092 if (err < 0)
1093 break;
1094 handled++;
1095
1096 __skip_event:
1097 /* Update pointers and counts */
1098 count -= len;
1099 buf += len;
1100 written += len;
1101
1102 /* let's have a coffee break if too many events are queued */
1103 if (++handled >= 200) {
1104 mutex_unlock(&client->ioctl_mutex);
1105 goto repeat;
1106 }
1107 }
1108
1109 out:
1110 mutex_unlock(&client->ioctl_mutex);
1111 return written ? written : err;
1112 }
1113
1114
1115 /*
1116 * handle polling
1117 */
1118 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1119 {
1120 struct snd_seq_client *client = file->private_data;
1121 __poll_t mask = 0;
1122
1123 /* check client structures are in place */
1124 if (snd_BUG_ON(!client))
1125 return EPOLLERR;
1126
1127 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1128 client->data.user.fifo) {
1129
1130 /* check if data is available in the outqueue */
1131 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1132 mask |= EPOLLIN | EPOLLRDNORM;
1133 }
1134
1135 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1136
1137 /* check if data is available in the pool */
1138 if (!snd_seq_write_pool_allocated(client) ||
1139 snd_seq_pool_poll_wait(client->pool, file, wait))
1140 mask |= EPOLLOUT | EPOLLWRNORM;
1141 }
1142
1143 return mask;
1144 }
1145
1146
1147 /*-----------------------------------------------------*/
1148
1149 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1150 {
1151 int *pversion = arg;
1152
1153 *pversion = SNDRV_SEQ_VERSION;
1154 return 0;
1155 }
1156
1157 static int snd_seq_ioctl_user_pversion(struct snd_seq_client *client, void *arg)
1158 {
1159 client->user_pversion = *(unsigned int *)arg;
1160 return 0;
1161 }
1162
1163 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1164 {
1165 int *client_id = arg;
1166
1167 *client_id = client->number;
1168 return 0;
1169 }
1170
1171 /* SYSTEM_INFO ioctl() */
1172 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1173 {
1174 struct snd_seq_system_info *info = arg;
1175
1176 memset(info, 0, sizeof(*info));
1177 /* fill the info fields */
1178 info->queues = SNDRV_SEQ_MAX_QUEUES;
1179 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1180 info->ports = SNDRV_SEQ_MAX_PORTS;
1181 info->channels = 256; /* fixed limit */
1182 info->cur_clients = client_usage.cur;
1183 info->cur_queues = snd_seq_queue_get_cur_queues();
1184
1185 return 0;
1186 }
1187
1188
1189 /* RUNNING_MODE ioctl() */
1190 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1191 {
1192 struct snd_seq_running_info *info = arg;
1193 struct snd_seq_client *cptr;
1194 int err = 0;
1195
1196 /* requested client number */
1197 cptr = snd_seq_client_use_ptr(info->client);
1198 if (cptr == NULL)
1199 return -ENOENT; /* don't change !!! */
1200
1201 #ifdef SNDRV_BIG_ENDIAN
1202 if (!info->big_endian) {
1203 err = -EINVAL;
1204 goto __err;
1205 }
1206 #else
1207 if (info->big_endian) {
1208 err = -EINVAL;
1209 goto __err;
1210 }
1211
1212 #endif
1213 if (info->cpu_mode > sizeof(long)) {
1214 err = -EINVAL;
1215 goto __err;
1216 }
1217 cptr->convert32 = (info->cpu_mode < sizeof(long));
1218 __err:
1219 snd_seq_client_unlock(cptr);
1220 return err;
1221 }
1222
1223 /* CLIENT_INFO ioctl() */
1224 static void get_client_info(struct snd_seq_client *cptr,
1225 struct snd_seq_client_info *info)
1226 {
1227 info->client = cptr->number;
1228
1229 /* fill the info fields */
1230 info->type = cptr->type;
1231 strcpy(info->name, cptr->name);
1232 info->filter = cptr->filter;
1233 info->event_lost = cptr->event_lost;
1234 memcpy(info->event_filter, cptr->event_filter, 32);
1235 info->group_filter = cptr->group_filter;
1236 info->num_ports = cptr->num_ports;
1237
1238 if (cptr->type == USER_CLIENT)
1239 info->pid = pid_vnr(cptr->data.user.owner);
1240 else
1241 info->pid = -1;
1242
1243 if (cptr->type == KERNEL_CLIENT)
1244 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1245 else
1246 info->card = -1;
1247
1248 info->midi_version = cptr->midi_version;
1249 memset(info->reserved, 0, sizeof(info->reserved));
1250 }
1251
1252 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1253 void *arg)
1254 {
1255 struct snd_seq_client_info *client_info = arg;
1256 struct snd_seq_client *cptr;
1257
1258 /* requested client number */
1259 cptr = snd_seq_client_use_ptr(client_info->client);
1260 if (cptr == NULL)
1261 return -ENOENT; /* don't change !!! */
1262
1263 get_client_info(cptr, client_info);
1264 snd_seq_client_unlock(cptr);
1265
1266 return 0;
1267 }
1268
1269
1270 /* CLIENT_INFO ioctl() */
1271 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1272 void *arg)
1273 {
1274 struct snd_seq_client_info *client_info = arg;
1275
1276 /* it is not allowed to set the info fields for an another client */
1277 if (client->number != client_info->client)
1278 return -EPERM;
1279 /* also client type must be set now */
1280 if (client->type != client_info->type)
1281 return -EINVAL;
1282
1283 /* check validity of midi_version field */
1284 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3) &&
1285 client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0)
1286 return -EINVAL;
1287
1288 /* fill the info fields */
1289 if (client_info->name[0])
1290 strscpy(client->name, client_info->name, sizeof(client->name));
1291
1292 client->filter = client_info->filter;
1293 client->event_lost = client_info->event_lost;
1294 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3))
1295 client->midi_version = client_info->midi_version;
1296 memcpy(client->event_filter, client_info->event_filter, 32);
1297 client->group_filter = client_info->group_filter;
1298 return 0;
1299 }
1300
1301
1302 /*
1303 * CREATE PORT ioctl()
1304 */
1305 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1306 {
1307 struct snd_seq_port_info *info = arg;
1308 struct snd_seq_client_port *port;
1309 struct snd_seq_port_callback *callback;
1310 int port_idx, err;
1311
1312 /* it is not allowed to create the port for an another client */
1313 if (info->addr.client != client->number)
1314 return -EPERM;
1315 if (client->type == USER_CLIENT && info->kernel)
1316 return -EINVAL;
1317 if ((info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT) &&
1318 client->ump_endpoint_port >= 0)
1319 return -EBUSY;
1320
1321 if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT)
1322 port_idx = info->addr.port;
1323 else
1324 port_idx = -1;
1325 if (port_idx >= SNDRV_SEQ_ADDRESS_UNKNOWN)
1326 return -EINVAL;
1327 err = snd_seq_create_port(client, port_idx, &port);
1328 if (err < 0)
1329 return err;
1330
1331 if (client->type == KERNEL_CLIENT) {
1332 callback = info->kernel;
1333 if (callback) {
1334 if (callback->owner)
1335 port->owner = callback->owner;
1336 port->private_data = callback->private_data;
1337 port->private_free = callback->private_free;
1338 port->event_input = callback->event_input;
1339 port->c_src.open = callback->subscribe;
1340 port->c_src.close = callback->unsubscribe;
1341 port->c_dest.open = callback->use;
1342 port->c_dest.close = callback->unuse;
1343 }
1344 }
1345
1346 info->addr = port->addr;
1347
1348 snd_seq_set_port_info(port, info);
1349 if (info->capability & SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT)
1350 client->ump_endpoint_port = port->addr.port;
1351 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1352 snd_seq_port_unlock(port);
1353
1354 return 0;
1355 }
1356
1357 /*
1358 * DELETE PORT ioctl()
1359 */
1360 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1361 {
1362 struct snd_seq_port_info *info = arg;
1363 int err;
1364
1365 /* it is not allowed to remove the port for an another client */
1366 if (info->addr.client != client->number)
1367 return -EPERM;
1368
1369 err = snd_seq_delete_port(client, info->addr.port);
1370 if (err >= 0) {
1371 if (client->ump_endpoint_port == info->addr.port)
1372 client->ump_endpoint_port = -1;
1373 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1374 }
1375 return err;
1376 }
1377
1378
1379 /*
1380 * GET_PORT_INFO ioctl() (on any client)
1381 */
1382 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1383 {
1384 struct snd_seq_port_info *info = arg;
1385 struct snd_seq_client *cptr;
1386 struct snd_seq_client_port *port;
1387
1388 cptr = snd_seq_client_use_ptr(info->addr.client);
1389 if (cptr == NULL)
1390 return -ENXIO;
1391
1392 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1393 if (port == NULL) {
1394 snd_seq_client_unlock(cptr);
1395 return -ENOENT; /* don't change */
1396 }
1397
1398 /* get port info */
1399 snd_seq_get_port_info(port, info);
1400 snd_seq_port_unlock(port);
1401 snd_seq_client_unlock(cptr);
1402
1403 return 0;
1404 }
1405
1406
1407 /*
1408 * SET_PORT_INFO ioctl() (only ports on this/own client)
1409 */
1410 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1411 {
1412 struct snd_seq_port_info *info = arg;
1413 struct snd_seq_client_port *port;
1414
1415 if (info->addr.client != client->number) /* only set our own ports ! */
1416 return -EPERM;
1417 port = snd_seq_port_use_ptr(client, info->addr.port);
1418 if (port) {
1419 snd_seq_set_port_info(port, info);
1420 snd_seq_port_unlock(port);
1421 }
1422 return 0;
1423 }
1424
1425
1426 /*
1427 * port subscription (connection)
1428 */
1429 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1430 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1431
1432 static int check_subscription_permission(struct snd_seq_client *client,
1433 struct snd_seq_client_port *sport,
1434 struct snd_seq_client_port *dport,
1435 struct snd_seq_port_subscribe *subs)
1436 {
1437 if (client->number != subs->sender.client &&
1438 client->number != subs->dest.client) {
1439 /* connection by third client - check export permission */
1440 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1441 return -EPERM;
1442 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1443 return -EPERM;
1444 }
1445
1446 /* check read permission */
1447 /* if sender or receiver is the subscribing client itself,
1448 * no permission check is necessary
1449 */
1450 if (client->number != subs->sender.client) {
1451 if (! check_port_perm(sport, PERM_RD))
1452 return -EPERM;
1453 }
1454 /* check write permission */
1455 if (client->number != subs->dest.client) {
1456 if (! check_port_perm(dport, PERM_WR))
1457 return -EPERM;
1458 }
1459 return 0;
1460 }
1461
1462 /*
1463 * send an subscription notify event to user client:
1464 * client must be user client.
1465 */
1466 int snd_seq_client_notify_subscription(int client, int port,
1467 struct snd_seq_port_subscribe *info,
1468 int evtype)
1469 {
1470 struct snd_seq_event event;
1471
1472 memset(&event, 0, sizeof(event));
1473 event.type = evtype;
1474 event.data.connect.dest = info->dest;
1475 event.data.connect.sender = info->sender;
1476
1477 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1478 }
1479
1480
1481 /*
1482 * add to port's subscription list IOCTL interface
1483 */
1484 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1485 void *arg)
1486 {
1487 struct snd_seq_port_subscribe *subs = arg;
1488 int result = -EINVAL;
1489 struct snd_seq_client *receiver = NULL, *sender = NULL;
1490 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1491
1492 receiver = snd_seq_client_use_ptr(subs->dest.client);
1493 if (!receiver)
1494 goto __end;
1495 sender = snd_seq_client_use_ptr(subs->sender.client);
1496 if (!sender)
1497 goto __end;
1498 sport = snd_seq_port_use_ptr(sender, subs->sender.port);
1499 if (!sport)
1500 goto __end;
1501 dport = snd_seq_port_use_ptr(receiver, subs->dest.port);
1502 if (!dport)
1503 goto __end;
1504
1505 result = check_subscription_permission(client, sport, dport, subs);
1506 if (result < 0)
1507 goto __end;
1508
1509 /* connect them */
1510 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1511 if (! result) /* broadcast announce */
1512 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1513 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1514 __end:
1515 if (sport)
1516 snd_seq_port_unlock(sport);
1517 if (dport)
1518 snd_seq_port_unlock(dport);
1519 if (sender)
1520 snd_seq_client_unlock(sender);
1521 if (receiver)
1522 snd_seq_client_unlock(receiver);
1523 return result;
1524 }
1525
1526
1527 /*
1528 * remove from port's subscription list
1529 */
1530 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1531 void *arg)
1532 {
1533 struct snd_seq_port_subscribe *subs = arg;
1534 int result = -ENXIO;
1535 struct snd_seq_client *receiver = NULL, *sender = NULL;
1536 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1537
1538 receiver = snd_seq_client_use_ptr(subs->dest.client);
1539 if (!receiver)
1540 goto __end;
1541 sender = snd_seq_client_use_ptr(subs->sender.client);
1542 if (!sender)
1543 goto __end;
1544 sport = snd_seq_port_use_ptr(sender, subs->sender.port);
1545 if (!sport)
1546 goto __end;
1547 dport = snd_seq_port_use_ptr(receiver, subs->dest.port);
1548 if (!dport)
1549 goto __end;
1550
1551 result = check_subscription_permission(client, sport, dport, subs);
1552 if (result < 0)
1553 goto __end;
1554
1555 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1556 if (! result) /* broadcast announce */
1557 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1558 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1559 __end:
1560 if (sport)
1561 snd_seq_port_unlock(sport);
1562 if (dport)
1563 snd_seq_port_unlock(dport);
1564 if (sender)
1565 snd_seq_client_unlock(sender);
1566 if (receiver)
1567 snd_seq_client_unlock(receiver);
1568 return result;
1569 }
1570
1571
1572 /* CREATE_QUEUE ioctl() */
1573 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1574 {
1575 struct snd_seq_queue_info *info = arg;
1576 struct snd_seq_queue *q;
1577
1578 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1579 if (IS_ERR(q))
1580 return PTR_ERR(q);
1581
1582 info->queue = q->queue;
1583 info->locked = q->locked;
1584 info->owner = q->owner;
1585
1586 /* set queue name */
1587 if (!info->name[0])
1588 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1589 strscpy(q->name, info->name, sizeof(q->name));
1590 snd_use_lock_free(&q->use_lock);
1591
1592 return 0;
1593 }
1594
1595 /* DELETE_QUEUE ioctl() */
1596 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1597 {
1598 struct snd_seq_queue_info *info = arg;
1599
1600 return snd_seq_queue_delete(client->number, info->queue);
1601 }
1602
1603 /* GET_QUEUE_INFO ioctl() */
1604 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1605 void *arg)
1606 {
1607 struct snd_seq_queue_info *info = arg;
1608 struct snd_seq_queue *q;
1609
1610 q = queueptr(info->queue);
1611 if (q == NULL)
1612 return -EINVAL;
1613
1614 memset(info, 0, sizeof(*info));
1615 info->queue = q->queue;
1616 info->owner = q->owner;
1617 info->locked = q->locked;
1618 strscpy(info->name, q->name, sizeof(info->name));
1619 queuefree(q);
1620
1621 return 0;
1622 }
1623
1624 /* SET_QUEUE_INFO ioctl() */
1625 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1626 void *arg)
1627 {
1628 struct snd_seq_queue_info *info = arg;
1629 struct snd_seq_queue *q;
1630
1631 if (info->owner != client->number)
1632 return -EINVAL;
1633
1634 /* change owner/locked permission */
1635 if (snd_seq_queue_check_access(info->queue, client->number)) {
1636 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1637 return -EPERM;
1638 if (info->locked)
1639 snd_seq_queue_use(info->queue, client->number, 1);
1640 } else {
1641 return -EPERM;
1642 }
1643
1644 q = queueptr(info->queue);
1645 if (! q)
1646 return -EINVAL;
1647 if (q->owner != client->number) {
1648 queuefree(q);
1649 return -EPERM;
1650 }
1651 strscpy(q->name, info->name, sizeof(q->name));
1652 queuefree(q);
1653
1654 return 0;
1655 }
1656
1657 /* GET_NAMED_QUEUE ioctl() */
1658 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1659 void *arg)
1660 {
1661 struct snd_seq_queue_info *info = arg;
1662 struct snd_seq_queue *q;
1663
1664 q = snd_seq_queue_find_name(info->name);
1665 if (q == NULL)
1666 return -EINVAL;
1667 info->queue = q->queue;
1668 info->owner = q->owner;
1669 info->locked = q->locked;
1670 queuefree(q);
1671
1672 return 0;
1673 }
1674
1675 /* GET_QUEUE_STATUS ioctl() */
1676 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1677 void *arg)
1678 {
1679 struct snd_seq_queue_status *status = arg;
1680 struct snd_seq_queue *queue;
1681 struct snd_seq_timer *tmr;
1682
1683 queue = queueptr(status->queue);
1684 if (queue == NULL)
1685 return -EINVAL;
1686 memset(status, 0, sizeof(*status));
1687 status->queue = queue->queue;
1688
1689 tmr = queue->timer;
1690 status->events = queue->tickq->cells + queue->timeq->cells;
1691
1692 status->time = snd_seq_timer_get_cur_time(tmr, true);
1693 status->tick = snd_seq_timer_get_cur_tick(tmr);
1694
1695 status->running = tmr->running;
1696
1697 status->flags = queue->flags;
1698 queuefree(queue);
1699
1700 return 0;
1701 }
1702
1703
1704 /* GET_QUEUE_TEMPO ioctl() */
1705 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1706 void *arg)
1707 {
1708 struct snd_seq_queue_tempo *tempo = arg;
1709 struct snd_seq_queue *queue;
1710 struct snd_seq_timer *tmr;
1711
1712 queue = queueptr(tempo->queue);
1713 if (queue == NULL)
1714 return -EINVAL;
1715 memset(tempo, 0, sizeof(*tempo));
1716 tempo->queue = queue->queue;
1717
1718 tmr = queue->timer;
1719
1720 tempo->tempo = tmr->tempo;
1721 tempo->ppq = tmr->ppq;
1722 tempo->skew_value = tmr->skew;
1723 tempo->skew_base = tmr->skew_base;
1724 if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 4))
1725 tempo->tempo_base = tmr->tempo_base;
1726 queuefree(queue);
1727
1728 return 0;
1729 }
1730
1731
1732 /* SET_QUEUE_TEMPO ioctl() */
1733 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1734 {
1735 if (!snd_seq_queue_check_access(tempo->queue, client))
1736 return -EPERM;
1737 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1738 }
1739 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1740
1741 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1742 void *arg)
1743 {
1744 struct snd_seq_queue_tempo *tempo = arg;
1745 int result;
1746
1747 if (client->user_pversion < SNDRV_PROTOCOL_VERSION(1, 0, 4))
1748 tempo->tempo_base = 0;
1749 result = snd_seq_set_queue_tempo(client->number, tempo);
1750 return result < 0 ? result : 0;
1751 }
1752
1753
1754 /* GET_QUEUE_TIMER ioctl() */
1755 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1756 void *arg)
1757 {
1758 struct snd_seq_queue_timer *timer = arg;
1759 struct snd_seq_queue *queue;
1760 struct snd_seq_timer *tmr;
1761
1762 queue = queueptr(timer->queue);
1763 if (queue == NULL)
1764 return -EINVAL;
1765
1766 mutex_lock(&queue->timer_mutex);
1767 tmr = queue->timer;
1768 memset(timer, 0, sizeof(*timer));
1769 timer->queue = queue->queue;
1770
1771 timer->type = tmr->type;
1772 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1773 timer->u.alsa.id = tmr->alsa_id;
1774 timer->u.alsa.resolution = tmr->preferred_resolution;
1775 }
1776 mutex_unlock(&queue->timer_mutex);
1777 queuefree(queue);
1778
1779 return 0;
1780 }
1781
1782
1783 /* SET_QUEUE_TIMER ioctl() */
1784 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1785 void *arg)
1786 {
1787 struct snd_seq_queue_timer *timer = arg;
1788 int result = 0;
1789
1790 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1791 return -EINVAL;
1792
1793 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1794 struct snd_seq_queue *q;
1795 struct snd_seq_timer *tmr;
1796
1797 q = queueptr(timer->queue);
1798 if (q == NULL)
1799 return -ENXIO;
1800 mutex_lock(&q->timer_mutex);
1801 tmr = q->timer;
1802 snd_seq_queue_timer_close(timer->queue);
1803 tmr->type = timer->type;
1804 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1805 tmr->alsa_id = timer->u.alsa.id;
1806 tmr->preferred_resolution = timer->u.alsa.resolution;
1807 }
1808 result = snd_seq_queue_timer_open(timer->queue);
1809 mutex_unlock(&q->timer_mutex);
1810 queuefree(q);
1811 } else {
1812 return -EPERM;
1813 }
1814
1815 return result;
1816 }
1817
1818
1819 /* GET_QUEUE_CLIENT ioctl() */
1820 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1821 void *arg)
1822 {
1823 struct snd_seq_queue_client *info = arg;
1824 int used;
1825
1826 used = snd_seq_queue_is_used(info->queue, client->number);
1827 if (used < 0)
1828 return -EINVAL;
1829 info->used = used;
1830 info->client = client->number;
1831
1832 return 0;
1833 }
1834
1835
1836 /* SET_QUEUE_CLIENT ioctl() */
1837 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1838 void *arg)
1839 {
1840 struct snd_seq_queue_client *info = arg;
1841 int err;
1842
1843 if (info->used >= 0) {
1844 err = snd_seq_queue_use(info->queue, client->number, info->used);
1845 if (err < 0)
1846 return err;
1847 }
1848
1849 return snd_seq_ioctl_get_queue_client(client, arg);
1850 }
1851
1852
1853 /* GET_CLIENT_POOL ioctl() */
1854 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1855 void *arg)
1856 {
1857 struct snd_seq_client_pool *info = arg;
1858 struct snd_seq_client *cptr;
1859
1860 cptr = snd_seq_client_use_ptr(info->client);
1861 if (cptr == NULL)
1862 return -ENOENT;
1863 memset(info, 0, sizeof(*info));
1864 info->client = cptr->number;
1865 info->output_pool = cptr->pool->size;
1866 info->output_room = cptr->pool->room;
1867 info->output_free = info->output_pool;
1868 info->output_free = snd_seq_unused_cells(cptr->pool);
1869 if (cptr->type == USER_CLIENT) {
1870 info->input_pool = cptr->data.user.fifo_pool_size;
1871 info->input_free = info->input_pool;
1872 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
1873 } else {
1874 info->input_pool = 0;
1875 info->input_free = 0;
1876 }
1877 snd_seq_client_unlock(cptr);
1878
1879 return 0;
1880 }
1881
1882 /* SET_CLIENT_POOL ioctl() */
1883 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1884 void *arg)
1885 {
1886 struct snd_seq_client_pool *info = arg;
1887 int rc;
1888
1889 if (client->number != info->client)
1890 return -EINVAL; /* can't change other clients */
1891
1892 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1893 (! snd_seq_write_pool_allocated(client) ||
1894 info->output_pool != client->pool->size)) {
1895 if (snd_seq_write_pool_allocated(client)) {
1896 /* is the pool in use? */
1897 if (atomic_read(&client->pool->counter))
1898 return -EBUSY;
1899 /* remove all existing cells */
1900 snd_seq_pool_mark_closing(client->pool);
1901 snd_seq_pool_done(client->pool);
1902 }
1903 client->pool->size = info->output_pool;
1904 rc = snd_seq_pool_init(client->pool);
1905 if (rc < 0)
1906 return rc;
1907 }
1908 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1909 info->input_pool >= 1 &&
1910 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1911 info->input_pool != client->data.user.fifo_pool_size) {
1912 /* change pool size */
1913 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1914 if (rc < 0)
1915 return rc;
1916 client->data.user.fifo_pool_size = info->input_pool;
1917 }
1918 if (info->output_room >= 1 &&
1919 info->output_room <= client->pool->size) {
1920 client->pool->room = info->output_room;
1921 }
1922
1923 return snd_seq_ioctl_get_client_pool(client, arg);
1924 }
1925
1926
1927 /* REMOVE_EVENTS ioctl() */
1928 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1929 void *arg)
1930 {
1931 struct snd_seq_remove_events *info = arg;
1932
1933 /*
1934 * Input mostly not implemented XXX.
1935 */
1936 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1937 /*
1938 * No restrictions so for a user client we can clear
1939 * the whole fifo
1940 */
1941 if (client->type == USER_CLIENT && client->data.user.fifo)
1942 snd_seq_fifo_clear(client->data.user.fifo);
1943 }
1944
1945 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1946 snd_seq_queue_remove_cells(client->number, info);
1947
1948 return 0;
1949 }
1950
1951
1952 /*
1953 * get subscription info
1954 */
1955 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1956 void *arg)
1957 {
1958 struct snd_seq_port_subscribe *subs = arg;
1959 int result;
1960 struct snd_seq_client *sender = NULL;
1961 struct snd_seq_client_port *sport = NULL;
1962
1963 result = -EINVAL;
1964 sender = snd_seq_client_use_ptr(subs->sender.client);
1965 if (!sender)
1966 goto __end;
1967 sport = snd_seq_port_use_ptr(sender, subs->sender.port);
1968 if (!sport)
1969 goto __end;
1970 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest,
1971 subs);
1972 __end:
1973 if (sport)
1974 snd_seq_port_unlock(sport);
1975 if (sender)
1976 snd_seq_client_unlock(sender);
1977
1978 return result;
1979 }
1980
1981
1982 /*
1983 * get subscription info - check only its presence
1984 */
1985 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1986 {
1987 struct snd_seq_query_subs *subs = arg;
1988 int result = -ENXIO;
1989 struct snd_seq_client *cptr = NULL;
1990 struct snd_seq_client_port *port = NULL;
1991 struct snd_seq_port_subs_info *group;
1992 struct list_head *p;
1993 int i;
1994
1995 cptr = snd_seq_client_use_ptr(subs->root.client);
1996 if (!cptr)
1997 goto __end;
1998 port = snd_seq_port_use_ptr(cptr, subs->root.port);
1999 if (!port)
2000 goto __end;
2001
2002 switch (subs->type) {
2003 case SNDRV_SEQ_QUERY_SUBS_READ:
2004 group = &port->c_src;
2005 break;
2006 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2007 group = &port->c_dest;
2008 break;
2009 default:
2010 goto __end;
2011 }
2012
2013 down_read(&group->list_mutex);
2014 /* search for the subscriber */
2015 subs->num_subs = group->count;
2016 i = 0;
2017 result = -ENOENT;
2018 list_for_each(p, &group->list_head) {
2019 if (i++ == subs->index) {
2020 /* found! */
2021 struct snd_seq_subscribers *s;
2022 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
2023 s = list_entry(p, struct snd_seq_subscribers, src_list);
2024 subs->addr = s->info.dest;
2025 } else {
2026 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2027 subs->addr = s->info.sender;
2028 }
2029 subs->flags = s->info.flags;
2030 subs->queue = s->info.queue;
2031 result = 0;
2032 break;
2033 }
2034 }
2035 up_read(&group->list_mutex);
2036
2037 __end:
2038 if (port)
2039 snd_seq_port_unlock(port);
2040 if (cptr)
2041 snd_seq_client_unlock(cptr);
2042
2043 return result;
2044 }
2045
2046
2047 /*
2048 * query next client
2049 */
2050 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2051 void *arg)
2052 {
2053 struct snd_seq_client_info *info = arg;
2054 struct snd_seq_client *cptr = NULL;
2055
2056 /* search for next client */
2057 if (info->client < INT_MAX)
2058 info->client++;
2059 if (info->client < 0)
2060 info->client = 0;
2061 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2062 cptr = snd_seq_client_use_ptr(info->client);
2063 if (cptr)
2064 break; /* found */
2065 }
2066 if (cptr == NULL)
2067 return -ENOENT;
2068
2069 get_client_info(cptr, info);
2070 snd_seq_client_unlock(cptr);
2071
2072 return 0;
2073 }
2074
2075 /*
2076 * query next port
2077 */
2078 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2079 void *arg)
2080 {
2081 struct snd_seq_port_info *info = arg;
2082 struct snd_seq_client *cptr;
2083 struct snd_seq_client_port *port = NULL;
2084
2085 cptr = snd_seq_client_use_ptr(info->addr.client);
2086 if (cptr == NULL)
2087 return -ENXIO;
2088
2089 /* search for next port */
2090 info->addr.port++;
2091 port = snd_seq_port_query_nearest(cptr, info);
2092 if (port == NULL) {
2093 snd_seq_client_unlock(cptr);
2094 return -ENOENT;
2095 }
2096
2097 /* get port info */
2098 info->addr = port->addr;
2099 snd_seq_get_port_info(port, info);
2100 snd_seq_port_unlock(port);
2101 snd_seq_client_unlock(cptr);
2102
2103 return 0;
2104 }
2105
2106 #if IS_ENABLED(CONFIG_SND_SEQ_UMP)
2107 #define NUM_UMP_INFOS (SNDRV_UMP_MAX_BLOCKS + 1)
2108
2109 static void free_ump_info(struct snd_seq_client *client)
2110 {
2111 int i;
2112
2113 if (!client->ump_info)
2114 return;
2115 for (i = 0; i < NUM_UMP_INFOS; i++)
2116 kfree(client->ump_info[i]);
2117 kfree(client->ump_info);
2118 client->ump_info = NULL;
2119 }
2120
2121 static void terminate_ump_info_strings(void *p, int type)
2122 {
2123 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT) {
2124 struct snd_ump_endpoint_info *ep = p;
2125 ep->name[sizeof(ep->name) - 1] = 0;
2126 } else {
2127 struct snd_ump_block_info *bp = p;
2128 bp->name[sizeof(bp->name) - 1] = 0;
2129 }
2130 }
2131
2132 #ifdef CONFIG_SND_PROC_FS
2133 static void dump_ump_info(struct snd_info_buffer *buffer,
2134 struct snd_seq_client *client)
2135 {
2136 struct snd_ump_endpoint_info *ep;
2137 struct snd_ump_block_info *bp;
2138 int i;
2139
2140 if (!client->ump_info)
2141 return;
2142 ep = client->ump_info[SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT];
2143 if (ep && *ep->name)
2144 snd_iprintf(buffer, " UMP Endpoint: \"%s\"\n", ep->name);
2145 for (i = 0; i < SNDRV_UMP_MAX_BLOCKS; i++) {
2146 bp = client->ump_info[i + 1];
2147 if (bp && *bp->name) {
2148 snd_iprintf(buffer, " UMP Block %d: \"%s\" [%s]\n",
2149 i, bp->name,
2150 bp->active ? "Active" : "Inactive");
2151 snd_iprintf(buffer, " Groups: %d-%d\n",
2152 bp->first_group + 1,
2153 bp->first_group + bp->num_groups);
2154 }
2155 }
2156 }
2157 #endif
2158
2159 /* UMP-specific ioctls -- called directly without data copy */
2160 static int snd_seq_ioctl_client_ump_info(struct snd_seq_client *caller,
2161 unsigned int cmd,
2162 unsigned long arg)
2163 {
2164 struct snd_seq_client_ump_info __user *argp =
2165 (struct snd_seq_client_ump_info __user *)arg;
2166 struct snd_seq_client *cptr;
2167 int client, type, err = 0;
2168 size_t size;
2169 void *p;
2170
2171 if (get_user(client, &argp->client) || get_user(type, &argp->type))
2172 return -EFAULT;
2173 if (cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO &&
2174 caller->number != client)
2175 return -EPERM;
2176 if (type < 0 || type >= NUM_UMP_INFOS)
2177 return -EINVAL;
2178 if (type == SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT)
2179 size = sizeof(struct snd_ump_endpoint_info);
2180 else
2181 size = sizeof(struct snd_ump_block_info);
2182 cptr = snd_seq_client_use_ptr(client);
2183 if (!cptr)
2184 return -ENOENT;
2185
2186 mutex_lock(&cptr->ioctl_mutex);
2187 if (!cptr->midi_version) {
2188 err = -EBADFD;
2189 goto error;
2190 }
2191
2192 if (cmd == SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO) {
2193 if (!cptr->ump_info)
2194 p = NULL;
2195 else
2196 p = cptr->ump_info[type];
2197 if (!p) {
2198 err = -ENODEV;
2199 goto error;
2200 }
2201 if (copy_to_user(argp->info, p, size)) {
2202 err = -EFAULT;
2203 goto error;
2204 }
2205 } else {
2206 if (cptr->type != USER_CLIENT) {
2207 err = -EBADFD;
2208 goto error;
2209 }
2210 if (!cptr->ump_info) {
2211 cptr->ump_info = kcalloc(NUM_UMP_INFOS,
2212 sizeof(void *), GFP_KERNEL);
2213 if (!cptr->ump_info) {
2214 err = -ENOMEM;
2215 goto error;
2216 }
2217 }
2218 p = memdup_user(argp->info, size);
2219 if (IS_ERR(p)) {
2220 err = PTR_ERR(p);
2221 goto error;
2222 }
2223 kfree(cptr->ump_info[type]);
2224 terminate_ump_info_strings(p, type);
2225 cptr->ump_info[type] = p;
2226 }
2227
2228 error:
2229 mutex_unlock(&cptr->ioctl_mutex);
2230 snd_seq_client_unlock(cptr);
2231 return err;
2232 }
2233 #endif
2234
2235 /* -------------------------------------------------------- */
2236
2237 static const struct ioctl_handler {
2238 unsigned int cmd;
2239 int (*func)(struct snd_seq_client *client, void *arg);
2240 } ioctl_handlers[] = {
2241 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2242 { SNDRV_SEQ_IOCTL_USER_PVERSION, snd_seq_ioctl_user_pversion },
2243 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2244 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2245 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2246 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2247 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2248 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2249 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2250 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2251 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2252 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2253 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2254 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2255 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2256 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2257 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2258 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2259 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2260 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2261 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2262 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2263 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2264 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2265 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2266 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2267 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2268 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2269 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2270 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2271 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2272 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2273 { 0, NULL },
2274 };
2275
2276 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2277 unsigned long arg)
2278 {
2279 struct snd_seq_client *client = file->private_data;
2280 /* To use kernel stack for ioctl data. */
2281 union {
2282 int pversion;
2283 int client_id;
2284 struct snd_seq_system_info system_info;
2285 struct snd_seq_running_info running_info;
2286 struct snd_seq_client_info client_info;
2287 struct snd_seq_port_info port_info;
2288 struct snd_seq_port_subscribe port_subscribe;
2289 struct snd_seq_queue_info queue_info;
2290 struct snd_seq_queue_status queue_status;
2291 struct snd_seq_queue_tempo tempo;
2292 struct snd_seq_queue_timer queue_timer;
2293 struct snd_seq_queue_client queue_client;
2294 struct snd_seq_client_pool client_pool;
2295 struct snd_seq_remove_events remove_events;
2296 struct snd_seq_query_subs query_subs;
2297 } buf;
2298 const struct ioctl_handler *handler;
2299 unsigned long size;
2300 int err;
2301
2302 if (snd_BUG_ON(!client))
2303 return -ENXIO;
2304
2305 #if IS_ENABLED(CONFIG_SND_SEQ_UMP)
2306 /* exception - handling large data */
2307 switch (cmd) {
2308 case SNDRV_SEQ_IOCTL_GET_CLIENT_UMP_INFO:
2309 case SNDRV_SEQ_IOCTL_SET_CLIENT_UMP_INFO:
2310 return snd_seq_ioctl_client_ump_info(client, cmd, arg);
2311 }
2312 #endif
2313
2314 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2315 if (handler->cmd == cmd)
2316 break;
2317 }
2318 if (handler->cmd == 0)
2319 return -ENOTTY;
2320
2321 memset(&buf, 0, sizeof(buf));
2322
2323 /*
2324 * All of ioctl commands for ALSA sequencer get an argument of size
2325 * within 13 bits. We can safely pick up the size from the command.
2326 */
2327 size = _IOC_SIZE(handler->cmd);
2328 if (handler->cmd & IOC_IN) {
2329 if (copy_from_user(&buf, (const void __user *)arg, size))
2330 return -EFAULT;
2331 }
2332
2333 mutex_lock(&client->ioctl_mutex);
2334 err = handler->func(client, &buf);
2335 mutex_unlock(&client->ioctl_mutex);
2336 if (err >= 0) {
2337 /* Some commands includes a bug in 'dir' field. */
2338 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2339 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2340 (handler->cmd & IOC_OUT))
2341 if (copy_to_user((void __user *)arg, &buf, size))
2342 return -EFAULT;
2343 }
2344
2345 return err;
2346 }
2347
2348 #ifdef CONFIG_COMPAT
2349 #include "seq_compat.c"
2350 #else
2351 #define snd_seq_ioctl_compat NULL
2352 #endif
2353
2354 /* -------------------------------------------------------- */
2355
2356
2357 /* exported to kernel modules */
2358 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2359 const char *name_fmt, ...)
2360 {
2361 struct snd_seq_client *client;
2362 va_list args;
2363
2364 if (snd_BUG_ON(in_interrupt()))
2365 return -EBUSY;
2366
2367 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2368 return -EINVAL;
2369 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2370 return -EINVAL;
2371
2372 mutex_lock(®ister_mutex);
2373
2374 if (card) {
2375 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2376 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2377 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2378 client_index = -1;
2379 }
2380
2381 /* empty write queue as default */
2382 client = seq_create_client1(client_index, 0);
2383 if (client == NULL) {
2384 mutex_unlock(®ister_mutex);
2385 return -EBUSY; /* failure code */
2386 }
2387 usage_alloc(&client_usage, 1);
2388
2389 client->accept_input = 1;
2390 client->accept_output = 1;
2391 client->data.kernel.card = card;
2392 client->user_pversion = SNDRV_SEQ_VERSION;
2393
2394 va_start(args, name_fmt);
2395 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2396 va_end(args);
2397
2398 client->type = KERNEL_CLIENT;
2399 mutex_unlock(®ister_mutex);
2400
2401 /* make others aware this new client */
2402 snd_seq_system_client_ev_client_start(client->number);
2403
2404 /* return client number to caller */
2405 return client->number;
2406 }
2407 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2408
2409 /* exported to kernel modules */
2410 int snd_seq_delete_kernel_client(int client)
2411 {
2412 struct snd_seq_client *ptr;
2413
2414 if (snd_BUG_ON(in_interrupt()))
2415 return -EBUSY;
2416
2417 ptr = clientptr(client);
2418 if (ptr == NULL)
2419 return -EINVAL;
2420
2421 seq_free_client(ptr);
2422 kfree(ptr);
2423 return 0;
2424 }
2425 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2426
2427 /*
2428 * exported, called by kernel clients to enqueue events (w/o blocking)
2429 *
2430 * RETURN VALUE: zero if succeed, negative if error
2431 */
2432 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev,
2433 struct file *file, bool blocking)
2434 {
2435 struct snd_seq_client *cptr;
2436 int result;
2437
2438 if (snd_BUG_ON(!ev))
2439 return -EINVAL;
2440
2441 if (!snd_seq_ev_is_ump(ev)) {
2442 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2443 return 0; /* ignore this */
2444 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2445 return -EINVAL; /* quoted events can't be enqueued */
2446 }
2447
2448 /* fill in client number */
2449 ev->source.client = client;
2450
2451 if (check_event_type_and_length(ev))
2452 return -EINVAL;
2453
2454 cptr = snd_seq_client_use_ptr(client);
2455 if (cptr == NULL)
2456 return -EINVAL;
2457
2458 if (!cptr->accept_output) {
2459 result = -EPERM;
2460 } else { /* send it */
2461 mutex_lock(&cptr->ioctl_mutex);
2462 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2463 false, 0,
2464 &cptr->ioctl_mutex);
2465 mutex_unlock(&cptr->ioctl_mutex);
2466 }
2467
2468 snd_seq_client_unlock(cptr);
2469 return result;
2470 }
2471 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2472
2473 /*
2474 * exported, called by kernel clients to dispatch events directly to other
2475 * clients, bypassing the queues. Event time-stamp will be updated.
2476 *
2477 * RETURN VALUE: negative = delivery failed,
2478 * zero, or positive: the number of delivered events
2479 */
2480 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2481 int atomic, int hop)
2482 {
2483 struct snd_seq_client *cptr;
2484 int result;
2485
2486 if (snd_BUG_ON(!ev))
2487 return -EINVAL;
2488
2489 /* fill in client number */
2490 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2491 ev->source.client = client;
2492
2493 if (check_event_type_and_length(ev))
2494 return -EINVAL;
2495
2496 cptr = snd_seq_client_use_ptr(client);
2497 if (cptr == NULL)
2498 return -EINVAL;
2499
2500 if (!cptr->accept_output)
2501 result = -EPERM;
2502 else
2503 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2504
2505 snd_seq_client_unlock(cptr);
2506 return result;
2507 }
2508 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2509
2510 /**
2511 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2512 * kernel space.
2513 * @clientid: A numerical ID for a client.
2514 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2515 * @arg: A pointer to data in kernel space.
2516 *
2517 * Against its name, both kernel/application client can be handled by this
2518 * kernel API. A pointer of 'arg' argument should be in kernel space.
2519 *
2520 * Return: 0 at success. Negative error code at failure.
2521 */
2522 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2523 {
2524 const struct ioctl_handler *handler;
2525 struct snd_seq_client *client;
2526
2527 client = clientptr(clientid);
2528 if (client == NULL)
2529 return -ENXIO;
2530
2531 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2532 if (handler->cmd == cmd)
2533 return handler->func(client, arg);
2534 }
2535
2536 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2537 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2538 return -ENOTTY;
2539 }
2540 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2541
2542 /* exported (for OSS emulator) */
2543 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2544 {
2545 struct snd_seq_client *client;
2546
2547 client = clientptr(clientid);
2548 if (client == NULL)
2549 return -ENXIO;
2550
2551 if (! snd_seq_write_pool_allocated(client))
2552 return 1;
2553 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2554 return 1;
2555 return 0;
2556 }
2557 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2558
2559 /* get a sequencer client object; for internal use from a kernel client */
2560 struct snd_seq_client *snd_seq_kernel_client_get(int id)
2561 {
2562 return snd_seq_client_use_ptr(id);
2563 }
2564 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_get);
2565
2566 /* put a sequencer client object; for internal use from a kernel client */
2567 void snd_seq_kernel_client_put(struct snd_seq_client *cptr)
2568 {
2569 if (cptr)
2570 snd_seq_client_unlock(cptr);
2571 }
2572 EXPORT_SYMBOL_GPL(snd_seq_kernel_client_put);
2573
2574 /*---------------------------------------------------------------------------*/
2575
2576 #ifdef CONFIG_SND_PROC_FS
2577 /*
2578 * /proc interface
2579 */
2580 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2581 struct snd_seq_port_subs_info *group,
2582 int is_src, char *msg)
2583 {
2584 struct list_head *p;
2585 struct snd_seq_subscribers *s;
2586 int count = 0;
2587
2588 down_read(&group->list_mutex);
2589 if (list_empty(&group->list_head)) {
2590 up_read(&group->list_mutex);
2591 return;
2592 }
2593 snd_iprintf(buffer, msg);
2594 list_for_each(p, &group->list_head) {
2595 if (is_src)
2596 s = list_entry(p, struct snd_seq_subscribers, src_list);
2597 else
2598 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2599 if (count++)
2600 snd_iprintf(buffer, ", ");
2601 snd_iprintf(buffer, "%d:%d",
2602 is_src ? s->info.dest.client : s->info.sender.client,
2603 is_src ? s->info.dest.port : s->info.sender.port);
2604 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2605 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2606 if (group->exclusive)
2607 snd_iprintf(buffer, "[ex]");
2608 }
2609 up_read(&group->list_mutex);
2610 snd_iprintf(buffer, "\n");
2611 }
2612
2613 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2614 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2615 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2616
2617 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2618
2619 static const char *port_direction_name(unsigned char dir)
2620 {
2621 static const char *names[4] = {
2622 "-", "In", "Out", "In/Out"
2623 };
2624
2625 if (dir > SNDRV_SEQ_PORT_DIR_BIDIRECTION)
2626 return "Invalid";
2627 return names[dir];
2628 }
2629
2630 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2631 struct snd_seq_client *client)
2632 {
2633 struct snd_seq_client_port *p;
2634
2635 mutex_lock(&client->ports_mutex);
2636 list_for_each_entry(p, &client->ports_list_head, list) {
2637 if (p->capability & SNDRV_SEQ_PORT_CAP_INACTIVE)
2638 continue;
2639 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c) [%s]\n",
2640 p->addr.port, p->name,
2641 FLAG_PERM_RD(p->capability),
2642 FLAG_PERM_WR(p->capability),
2643 FLAG_PERM_EX(p->capability),
2644 FLAG_PERM_DUPLEX(p->capability),
2645 port_direction_name(p->direction));
2646 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2647 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2648 }
2649 mutex_unlock(&client->ports_mutex);
2650 }
2651
2652 static const char *midi_version_string(unsigned int version)
2653 {
2654 switch (version) {
2655 case SNDRV_SEQ_CLIENT_LEGACY_MIDI:
2656 return "Legacy";
2657 case SNDRV_SEQ_CLIENT_UMP_MIDI_1_0:
2658 return "UMP MIDI1";
2659 case SNDRV_SEQ_CLIENT_UMP_MIDI_2_0:
2660 return "UMP MIDI2";
2661 default:
2662 return "Unknown";
2663 }
2664 }
2665
2666 /* exported to seq_info.c */
2667 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2668 struct snd_info_buffer *buffer)
2669 {
2670 int c;
2671 struct snd_seq_client *client;
2672
2673 snd_iprintf(buffer, "Client info\n");
2674 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2675 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2676 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2677 snd_iprintf(buffer, "\n");
2678
2679 /* list the client table */
2680 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2681 client = snd_seq_client_use_ptr(c);
2682 if (client == NULL)
2683 continue;
2684 if (client->type == NO_CLIENT) {
2685 snd_seq_client_unlock(client);
2686 continue;
2687 }
2688
2689 snd_iprintf(buffer, "Client %3d : \"%s\" [%s %s]\n",
2690 c, client->name,
2691 client->type == USER_CLIENT ? "User" : "Kernel",
2692 midi_version_string(client->midi_version));
2693 #if IS_ENABLED(CONFIG_SND_SEQ_UMP)
2694 dump_ump_info(buffer, client);
2695 #endif
2696 snd_seq_info_dump_ports(buffer, client);
2697 if (snd_seq_write_pool_allocated(client)) {
2698 snd_iprintf(buffer, " Output pool :\n");
2699 snd_seq_info_pool(buffer, client->pool, " ");
2700 }
2701 if (client->type == USER_CLIENT && client->data.user.fifo &&
2702 client->data.user.fifo->pool) {
2703 snd_iprintf(buffer, " Input pool :\n");
2704 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2705 }
2706 snd_seq_client_unlock(client);
2707 }
2708 }
2709 #endif /* CONFIG_SND_PROC_FS */
2710
2711 /*---------------------------------------------------------------------------*/
2712
2713
2714 /*
2715 * REGISTRATION PART
2716 */
2717
2718 static const struct file_operations snd_seq_f_ops =
2719 {
2720 .owner = THIS_MODULE,
2721 .read = snd_seq_read,
2722 .write = snd_seq_write,
2723 .open = snd_seq_open,
2724 .release = snd_seq_release,
2725 .llseek = no_llseek,
2726 .poll = snd_seq_poll,
2727 .unlocked_ioctl = snd_seq_ioctl,
2728 .compat_ioctl = snd_seq_ioctl_compat,
2729 };
2730
2731 static struct device *seq_dev;
2732
2733 /*
2734 * register sequencer device
2735 */
2736 int __init snd_sequencer_device_init(void)
2737 {
2738 int err;
2739
2740 err = snd_device_alloc(&seq_dev, NULL);
2741 if (err < 0)
2742 return err;
2743 dev_set_name(seq_dev, "seq");
2744
2745 mutex_lock(®ister_mutex);
2746 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2747 &snd_seq_f_ops, NULL, seq_dev);
2748 mutex_unlock(®ister_mutex);
2749 if (err < 0) {
2750 put_device(seq_dev);
2751 return err;
2752 }
2753
2754 return 0;
2755 }
2756
2757
2758
2759 /*
2760 * unregister sequencer device
2761 */
2762 void snd_sequencer_device_done(void)
2763 {
2764 snd_unregister_device(seq_dev);
2765 put_device(seq_dev);
2766 }
2767
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