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