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WIP FPC-III support
[linux/fpc-iii.git] / sound / core / seq / seq_clientmgr.c
blobf9f2fea58b32cf3d81e9b7695a10bcd8c52e3e51
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 if (client->pool)
283 snd_seq_pool_delete(&client->pool);
284 spin_lock_irq(&clients_lock);
285 clienttablock[client->number] = 0;
286 spin_unlock_irq(&clients_lock);
287 return 0;
288 }
289
290
291 static void seq_free_client(struct snd_seq_client * client)
292 {
293 mutex_lock(&register_mutex);
294 switch (client->type) {
295 case NO_CLIENT:
296 pr_warn("ALSA: seq: Trying to free unused client %d\n",
297 client->number);
298 break;
299 case USER_CLIENT:
300 case KERNEL_CLIENT:
301 seq_free_client1(client);
302 usage_free(&client_usage, 1);
303 break;
304
305 default:
306 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
307 client->number, client->type);
308 }
309 mutex_unlock(&register_mutex);
310
311 snd_seq_system_client_ev_client_exit(client->number);
312 }
313
314
315
316 /* -------------------------------------------------------- */
317
318 /* create a user client */
319 static int snd_seq_open(struct inode *inode, struct file *file)
320 {
321 int c, mode; /* client id */
322 struct snd_seq_client *client;
323 struct snd_seq_user_client *user;
324 int err;
325
326 err = stream_open(inode, file);
327 if (err < 0)
328 return err;
329
330 mutex_lock(&register_mutex);
331 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
332 if (!client) {
333 mutex_unlock(&register_mutex);
334 return -ENOMEM; /* failure code */
335 }
336
337 mode = snd_seq_file_flags(file);
338 if (mode & SNDRV_SEQ_LFLG_INPUT)
339 client->accept_input = 1;
340 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
341 client->accept_output = 1;
342
343 user = &client->data.user;
344 user->fifo = NULL;
345 user->fifo_pool_size = 0;
346
347 if (mode & SNDRV_SEQ_LFLG_INPUT) {
348 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
349 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
350 if (user->fifo == NULL) {
351 seq_free_client1(client);
352 kfree(client);
353 mutex_unlock(&register_mutex);
354 return -ENOMEM;
355 }
356 }
357
358 usage_alloc(&client_usage, 1);
359 client->type = USER_CLIENT;
360 mutex_unlock(&register_mutex);
361
362 c = client->number;
363 file->private_data = client;
364
365 /* fill client data */
366 user->file = file;
367 sprintf(client->name, "Client-%d", c);
368 client->data.user.owner = get_pid(task_pid(current));
369
370 /* make others aware this new client */
371 snd_seq_system_client_ev_client_start(c);
372
373 return 0;
374 }
375
376 /* delete a user client */
377 static int snd_seq_release(struct inode *inode, struct file *file)
378 {
379 struct snd_seq_client *client = file->private_data;
380
381 if (client) {
382 seq_free_client(client);
383 if (client->data.user.fifo)
384 snd_seq_fifo_delete(&client->data.user.fifo);
385 put_pid(client->data.user.owner);
386 kfree(client);
387 }
388
389 return 0;
390 }
391
392
393 /* handle client read() */
394 /* possible error values:
395 * -ENXIO invalid client or file open mode
396 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
397 * -EINVAL no enough user-space buffer to write the whole event
398 * -EFAULT seg. fault during copy to user space
399 */
400 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
401 loff_t *offset)
402 {
403 struct snd_seq_client *client = file->private_data;
404 struct snd_seq_fifo *fifo;
405 int err;
406 long result = 0;
407 struct snd_seq_event_cell *cell;
408
409 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
410 return -ENXIO;
411
412 if (!access_ok(buf, count))
413 return -EFAULT;
414
415 /* check client structures are in place */
416 if (snd_BUG_ON(!client))
417 return -ENXIO;
418
419 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
420 return -ENXIO;
421
422 if (atomic_read(&fifo->overflow) > 0) {
423 /* buffer overflow is detected */
424 snd_seq_fifo_clear(fifo);
425 /* return error code */
426 return -ENOSPC;
427 }
428
429 cell = NULL;
430 err = 0;
431 snd_seq_fifo_lock(fifo);
432
433 /* while data available in queue */
434 while (count >= sizeof(struct snd_seq_event)) {
435 int nonblock;
436
437 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
438 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
439 break;
440 }
441 if (snd_seq_ev_is_variable(&cell->event)) {
442 struct snd_seq_event tmpev;
443 tmpev = cell->event;
444 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
445 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
446 err = -EFAULT;
447 break;
448 }
449 count -= sizeof(struct snd_seq_event);
450 buf += sizeof(struct snd_seq_event);
451 err = snd_seq_expand_var_event(&cell->event, count,
452 (char __force *)buf, 0,
453 sizeof(struct snd_seq_event));
454 if (err < 0)
455 break;
456 result += err;
457 count -= err;
458 buf += err;
459 } else {
460 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
461 err = -EFAULT;
462 break;
463 }
464 count -= sizeof(struct snd_seq_event);
465 buf += sizeof(struct snd_seq_event);
466 }
467 snd_seq_cell_free(cell);
468 cell = NULL; /* to be sure */
469 result += sizeof(struct snd_seq_event);
470 }
471
472 if (err < 0) {
473 if (cell)
474 snd_seq_fifo_cell_putback(fifo, cell);
475 if (err == -EAGAIN && result > 0)
476 err = 0;
477 }
478 snd_seq_fifo_unlock(fifo);
479
480 return (err < 0) ? err : result;
481 }
482
483
484 /*
485 * check access permission to the port
486 */
487 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
488 {
489 if ((port->capability & flags) != flags)
490 return 0;
491 return flags;
492 }
493
494 /*
495 * check if the destination client is available, and return the pointer
496 * if filter is non-zero, client filter bitmap is tested.
497 */
498 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
499 int filter)
500 {
501 struct snd_seq_client *dest;
502
503 dest = snd_seq_client_use_ptr(event->dest.client);
504 if (dest == NULL)
505 return NULL;
506 if (! dest->accept_input)
507 goto __not_avail;
508 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
509 ! test_bit(event->type, dest->event_filter))
510 goto __not_avail;
511 if (filter && !(dest->filter & filter))
512 goto __not_avail;
513
514 return dest; /* ok - accessible */
515 __not_avail:
516 snd_seq_client_unlock(dest);
517 return NULL;
518 }
519
520
521 /*
522 * Return the error event.
523 *
524 * If the receiver client is a user client, the original event is
525 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
526 * the original event is also variable length, the external data is
527 * copied after the event record.
528 * If the receiver client is a kernel client, the original event is
529 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
530 * kmalloc.
531 */
532 static int bounce_error_event(struct snd_seq_client *client,
533 struct snd_seq_event *event,
534 int err, int atomic, int hop)
535 {
536 struct snd_seq_event bounce_ev;
537 int result;
538
539 if (client == NULL ||
540 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
541 ! client->accept_input)
542 return 0; /* ignored */
543
544 /* set up quoted error */
545 memset(&bounce_ev, 0, sizeof(bounce_ev));
546 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
547 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
548 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
549 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
550 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
551 bounce_ev.dest.client = client->number;
552 bounce_ev.dest.port = event->source.port;
553 bounce_ev.data.quote.origin = event->dest;
554 bounce_ev.data.quote.event = event;
555 bounce_ev.data.quote.value = -err; /* use positive value */
556 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
557 if (result < 0) {
558 client->event_lost++;
559 return result;
560 }
561
562 return result;
563 }
564
565
566 /*
567 * rewrite the time-stamp of the event record with the curren time
568 * of the given queue.
569 * return non-zero if updated.
570 */
571 static int update_timestamp_of_queue(struct snd_seq_event *event,
572 int queue, int real_time)
573 {
574 struct snd_seq_queue *q;
575
576 q = queueptr(queue);
577 if (! q)
578 return 0;
579 event->queue = queue;
580 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
581 if (real_time) {
582 event->time.time = snd_seq_timer_get_cur_time(q->timer, true);
583 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
584 } else {
585 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
586 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
587 }
588 queuefree(q);
589 return 1;
590 }
591
592
593 /*
594 * deliver an event to the specified destination.
595 * if filter is non-zero, client filter bitmap is tested.
596 *
597 * RETURN VALUE: 0 : if succeeded
598 * <0 : error
599 */
600 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
601 struct snd_seq_event *event,
602 int filter, int atomic, int hop)
603 {
604 struct snd_seq_client *dest = NULL;
605 struct snd_seq_client_port *dest_port = NULL;
606 int result = -ENOENT;
607 int direct;
608
609 direct = snd_seq_ev_is_direct(event);
610
611 dest = get_event_dest_client(event, filter);
612 if (dest == NULL)
613 goto __skip;
614 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
615 if (dest_port == NULL)
616 goto __skip;
617
618 /* check permission */
619 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
620 result = -EPERM;
621 goto __skip;
622 }
623
624 if (dest_port->timestamping)
625 update_timestamp_of_queue(event, dest_port->time_queue,
626 dest_port->time_real);
627
628 switch (dest->type) {
629 case USER_CLIENT:
630 if (dest->data.user.fifo)
631 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
632 break;
633
634 case KERNEL_CLIENT:
635 if (dest_port->event_input == NULL)
636 break;
637 result = dest_port->event_input(event, direct,
638 dest_port->private_data,
639 atomic, hop);
640 break;
641 default:
642 break;
643 }
644
645 __skip:
646 if (dest_port)
647 snd_seq_port_unlock(dest_port);
648 if (dest)
649 snd_seq_client_unlock(dest);
650
651 if (result < 0 && !direct) {
652 result = bounce_error_event(client, event, result, atomic, hop);
653 }
654 return result;
655 }
656
657
658 /*
659 * send the event to all subscribers:
660 */
661 static int deliver_to_subscribers(struct snd_seq_client *client,
662 struct snd_seq_event *event,
663 int atomic, int hop)
664 {
665 struct snd_seq_subscribers *subs;
666 int err, result = 0, num_ev = 0;
667 struct snd_seq_event event_saved;
668 struct snd_seq_client_port *src_port;
669 struct snd_seq_port_subs_info *grp;
670
671 src_port = snd_seq_port_use_ptr(client, event->source.port);
672 if (src_port == NULL)
673 return -EINVAL; /* invalid source port */
674 /* save original event record */
675 event_saved = *event;
676 grp = &src_port->c_src;
677
678 /* lock list */
679 if (atomic)
680 read_lock(&grp->list_lock);
681 else
682 down_read_nested(&grp->list_mutex, hop);
683 list_for_each_entry(subs, &grp->list_head, src_list) {
684 /* both ports ready? */
685 if (atomic_read(&subs->ref_count) != 2)
686 continue;
687 event->dest = subs->info.dest;
688 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
689 /* convert time according to flag with subscription */
690 update_timestamp_of_queue(event, subs->info.queue,
691 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
692 err = snd_seq_deliver_single_event(client, event,
693 0, atomic, hop);
694 if (err < 0) {
695 /* save first error that occurs and continue */
696 if (!result)
697 result = err;
698 continue;
699 }
700 num_ev++;
701 /* restore original event record */
702 *event = event_saved;
703 }
704 if (atomic)
705 read_unlock(&grp->list_lock);
706 else
707 up_read(&grp->list_mutex);
708 *event = event_saved; /* restore */
709 snd_seq_port_unlock(src_port);
710 return (result < 0) ? result : num_ev;
711 }
712
713
714 #ifdef SUPPORT_BROADCAST
715 /*
716 * broadcast to all ports:
717 */
718 static int port_broadcast_event(struct snd_seq_client *client,
719 struct snd_seq_event *event,
720 int atomic, int hop)
721 {
722 int num_ev = 0, err, result = 0;
723 struct snd_seq_client *dest_client;
724 struct snd_seq_client_port *port;
725
726 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
727 if (dest_client == NULL)
728 return 0; /* no matching destination */
729
730 read_lock(&dest_client->ports_lock);
731 list_for_each_entry(port, &dest_client->ports_list_head, list) {
732 event->dest.port = port->addr.port;
733 /* pass NULL as source client to avoid error bounce */
734 err = snd_seq_deliver_single_event(NULL, event,
735 SNDRV_SEQ_FILTER_BROADCAST,
736 atomic, hop);
737 if (err < 0) {
738 /* save first error that occurs and continue */
739 if (!result)
740 result = err;
741 continue;
742 }
743 num_ev++;
744 }
745 read_unlock(&dest_client->ports_lock);
746 snd_seq_client_unlock(dest_client);
747 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
748 return (result < 0) ? result : num_ev;
749 }
750
751 /*
752 * send the event to all clients:
753 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
754 */
755 static int broadcast_event(struct snd_seq_client *client,
756 struct snd_seq_event *event, int atomic, int hop)
757 {
758 int err, result = 0, num_ev = 0;
759 int dest;
760 struct snd_seq_addr addr;
761
762 addr = event->dest; /* save */
763
764 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
765 /* don't send to itself */
766 if (dest == client->number)
767 continue;
768 event->dest.client = dest;
769 event->dest.port = addr.port;
770 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
771 err = port_broadcast_event(client, event, atomic, hop);
772 else
773 /* pass NULL as source client to avoid error bounce */
774 err = snd_seq_deliver_single_event(NULL, event,
775 SNDRV_SEQ_FILTER_BROADCAST,
776 atomic, hop);
777 if (err < 0) {
778 /* save first error that occurs and continue */
779 if (!result)
780 result = err;
781 continue;
782 }
783 num_ev += err;
784 }
785 event->dest = addr; /* restore */
786 return (result < 0) ? result : num_ev;
787 }
788
789
790 /* multicast - not supported yet */
791 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
792 int atomic, int hop)
793 {
794 pr_debug("ALSA: seq: multicast not supported yet.\n");
795 return 0; /* ignored */
796 }
797 #endif /* SUPPORT_BROADCAST */
798
799
800 /* deliver an event to the destination port(s).
801 * if the event is to subscribers or broadcast, the event is dispatched
802 * to multiple targets.
803 *
804 * RETURN VALUE: n > 0 : the number of delivered events.
805 * n == 0 : the event was not passed to any client.
806 * n < 0 : error - event was not processed.
807 */
808 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
809 int atomic, int hop)
810 {
811 int result;
812
813 hop++;
814 if (hop >= SNDRV_SEQ_MAX_HOPS) {
815 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
816 event->source.client, event->source.port,
817 event->dest.client, event->dest.port);
818 return -EMLINK;
819 }
820
821 if (snd_seq_ev_is_variable(event) &&
822 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
823 return -EINVAL;
824
825 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
826 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
827 result = deliver_to_subscribers(client, event, atomic, hop);
828 #ifdef SUPPORT_BROADCAST
829 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
830 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
831 result = broadcast_event(client, event, atomic, hop);
832 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
833 result = multicast_event(client, event, atomic, hop);
834 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
835 result = port_broadcast_event(client, event, atomic, hop);
836 #endif
837 else
838 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
839
840 return result;
841 }
842
843 /*
844 * dispatch an event cell:
845 * This function is called only from queue check routines in timer
846 * interrupts or after enqueued.
847 * The event cell shall be released or re-queued in this function.
848 *
849 * RETURN VALUE: n > 0 : the number of delivered events.
850 * n == 0 : the event was not passed to any client.
851 * n < 0 : error - event was not processed.
852 */
853 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
854 {
855 struct snd_seq_client *client;
856 int result;
857
858 if (snd_BUG_ON(!cell))
859 return -EINVAL;
860
861 client = snd_seq_client_use_ptr(cell->event.source.client);
862 if (client == NULL) {
863 snd_seq_cell_free(cell); /* release this cell */
864 return -EINVAL;
865 }
866
867 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
868 /* NOTE event:
869 * the event cell is re-used as a NOTE-OFF event and
870 * enqueued again.
871 */
872 struct snd_seq_event tmpev, *ev;
873
874 /* reserve this event to enqueue note-off later */
875 tmpev = cell->event;
876 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
877 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
878
879 /*
880 * This was originally a note event. We now re-use the
881 * cell for the note-off event.
882 */
883
884 ev = &cell->event;
885 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
886 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
887
888 /* add the duration time */
889 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
890 case SNDRV_SEQ_TIME_STAMP_TICK:
891 ev->time.tick += ev->data.note.duration;
892 break;
893 case SNDRV_SEQ_TIME_STAMP_REAL:
894 /* unit for duration is ms */
895 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
896 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
897 ev->time.time.tv_nsec / 1000000000;
898 ev->time.time.tv_nsec %= 1000000000;
899 break;
900 }
901 ev->data.note.velocity = ev->data.note.off_velocity;
902
903 /* Now queue this cell as the note off event */
904 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
905 snd_seq_cell_free(cell); /* release this cell */
906
907 } else {
908 /* Normal events:
909 * event cell is freed after processing the event
910 */
911
912 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
913 snd_seq_cell_free(cell);
914 }
915
916 snd_seq_client_unlock(client);
917 return result;
918 }
919
920
921 /* Allocate a cell from client pool and enqueue it to queue:
922 * if pool is empty and blocking is TRUE, sleep until a new cell is
923 * available.
924 */
925 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
926 struct snd_seq_event *event,
927 struct file *file, int blocking,
928 int atomic, int hop,
929 struct mutex *mutexp)
930 {
931 struct snd_seq_event_cell *cell;
932 int err;
933
934 /* special queue values - force direct passing */
935 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
936 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
937 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
938 } else
939 #ifdef SUPPORT_BROADCAST
940 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
941 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
942 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
943 }
944 #endif
945 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
946 /* check presence of source port */
947 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
948 if (src_port == NULL)
949 return -EINVAL;
950 snd_seq_port_unlock(src_port);
951 }
952
953 /* direct event processing without enqueued */
954 if (snd_seq_ev_is_direct(event)) {
955 if (event->type == SNDRV_SEQ_EVENT_NOTE)
956 return -EINVAL; /* this event must be enqueued! */
957 return snd_seq_deliver_event(client, event, atomic, hop);
958 }
959
960 /* Not direct, normal queuing */
961 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
962 return -EINVAL; /* invalid queue */
963 if (! snd_seq_write_pool_allocated(client))
964 return -ENXIO; /* queue is not allocated */
965
966 /* allocate an event cell */
967 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
968 file, mutexp);
969 if (err < 0)
970 return err;
971
972 /* we got a cell. enqueue it. */
973 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
974 snd_seq_cell_free(cell);
975 return err;
976 }
977
978 return 0;
979 }
980
981
982 /*
983 * check validity of event type and data length.
984 * return non-zero if invalid.
985 */
986 static int check_event_type_and_length(struct snd_seq_event *ev)
987 {
988 switch (snd_seq_ev_length_type(ev)) {
989 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
990 if (snd_seq_ev_is_variable_type(ev))
991 return -EINVAL;
992 break;
993 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
994 if (! snd_seq_ev_is_variable_type(ev) ||
995 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
996 return -EINVAL;
997 break;
998 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
999 if (! snd_seq_ev_is_direct(ev))
1000 return -EINVAL;
1001 break;
1002 }
1003 return 0;
1004 }
1005
1006
1007 /* handle write() */
1008 /* possible error values:
1009 * -ENXIO invalid client or file open mode
1010 * -ENOMEM malloc failed
1011 * -EFAULT seg. fault during copy from user space
1012 * -EINVAL invalid event
1013 * -EAGAIN no space in output pool
1014 * -EINTR interrupts while sleep
1015 * -EMLINK too many hops
1016 * others depends on return value from driver callback
1017 */
1018 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1019 size_t count, loff_t *offset)
1020 {
1021 struct snd_seq_client *client = file->private_data;
1022 int written = 0, len;
1023 int err, handled;
1024 struct snd_seq_event event;
1025
1026 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1027 return -ENXIO;
1028
1029 /* check client structures are in place */
1030 if (snd_BUG_ON(!client))
1031 return -ENXIO;
1032
1033 if (!client->accept_output || client->pool == NULL)
1034 return -ENXIO;
1035
1036 repeat:
1037 handled = 0;
1038 /* allocate the pool now if the pool is not allocated yet */
1039 mutex_lock(&client->ioctl_mutex);
1040 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1041 err = snd_seq_pool_init(client->pool);
1042 if (err < 0)
1043 goto out;
1044 }
1045
1046 /* only process whole events */
1047 err = -EINVAL;
1048 while (count >= sizeof(struct snd_seq_event)) {
1049 /* Read in the event header from the user */
1050 len = sizeof(event);
1051 if (copy_from_user(&event, buf, len)) {
1052 err = -EFAULT;
1053 break;
1054 }
1055 event.source.client = client->number; /* fill in client number */
1056 /* Check for extension data length */
1057 if (check_event_type_and_length(&event)) {
1058 err = -EINVAL;
1059 break;
1060 }
1061
1062 /* check for special events */
1063 if (event.type == SNDRV_SEQ_EVENT_NONE)
1064 goto __skip_event;
1065 else if (snd_seq_ev_is_reserved(&event)) {
1066 err = -EINVAL;
1067 break;
1068 }
1069
1070 if (snd_seq_ev_is_variable(&event)) {
1071 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1072 if ((size_t)(extlen + len) > count) {
1073 /* back out, will get an error this time or next */
1074 err = -EINVAL;
1075 break;
1076 }
1077 /* set user space pointer */
1078 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1079 event.data.ext.ptr = (char __force *)buf
1080 + sizeof(struct snd_seq_event);
1081 len += extlen; /* increment data length */
1082 } else {
1083 #ifdef CONFIG_COMPAT
1084 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1085 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1086 event.data.ext.ptr = ptr;
1087 }
1088 #endif
1089 }
1090
1091 /* ok, enqueue it */
1092 err = snd_seq_client_enqueue_event(client, &event, file,
1093 !(file->f_flags & O_NONBLOCK),
1094 0, 0, &client->ioctl_mutex);
1095 if (err < 0)
1096 break;
1097 handled++;
1098
1099 __skip_event:
1100 /* Update pointers and counts */
1101 count -= len;
1102 buf += len;
1103 written += len;
1104
1105 /* let's have a coffee break if too many events are queued */
1106 if (++handled >= 200) {
1107 mutex_unlock(&client->ioctl_mutex);
1108 goto repeat;
1109 }
1110 }
1111
1112 out:
1113 mutex_unlock(&client->ioctl_mutex);
1114 return written ? written : err;
1115 }
1116
1117
1118 /*
1119 * handle polling
1120 */
1121 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1122 {
1123 struct snd_seq_client *client = file->private_data;
1124 __poll_t mask = 0;
1125
1126 /* check client structures are in place */
1127 if (snd_BUG_ON(!client))
1128 return EPOLLERR;
1129
1130 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1131 client->data.user.fifo) {
1132
1133 /* check if data is available in the outqueue */
1134 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1135 mask |= EPOLLIN | EPOLLRDNORM;
1136 }
1137
1138 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1139
1140 /* check if data is available in the pool */
1141 if (!snd_seq_write_pool_allocated(client) ||
1142 snd_seq_pool_poll_wait(client->pool, file, wait))
1143 mask |= EPOLLOUT | EPOLLWRNORM;
1144 }
1145
1146 return mask;
1147 }
1148
1149
1150 /*-----------------------------------------------------*/
1151
1152 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1153 {
1154 int *pversion = arg;
1155
1156 *pversion = SNDRV_SEQ_VERSION;
1157 return 0;
1158 }
1159
1160 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1161 {
1162 int *client_id = arg;
1163
1164 *client_id = client->number;
1165 return 0;
1166 }
1167
1168 /* SYSTEM_INFO ioctl() */
1169 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1170 {
1171 struct snd_seq_system_info *info = arg;
1172
1173 memset(info, 0, sizeof(*info));
1174 /* fill the info fields */
1175 info->queues = SNDRV_SEQ_MAX_QUEUES;
1176 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1177 info->ports = SNDRV_SEQ_MAX_PORTS;
1178 info->channels = 256; /* fixed limit */
1179 info->cur_clients = client_usage.cur;
1180 info->cur_queues = snd_seq_queue_get_cur_queues();
1181
1182 return 0;
1183 }
1184
1185
1186 /* RUNNING_MODE ioctl() */
1187 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1188 {
1189 struct snd_seq_running_info *info = arg;
1190 struct snd_seq_client *cptr;
1191 int err = 0;
1192
1193 /* requested client number */
1194 cptr = snd_seq_client_use_ptr(info->client);
1195 if (cptr == NULL)
1196 return -ENOENT; /* don't change !!! */
1197
1198 #ifdef SNDRV_BIG_ENDIAN
1199 if (!info->big_endian) {
1200 err = -EINVAL;
1201 goto __err;
1202 }
1203 #else
1204 if (info->big_endian) {
1205 err = -EINVAL;
1206 goto __err;
1207 }
1208
1209 #endif
1210 if (info->cpu_mode > sizeof(long)) {
1211 err = -EINVAL;
1212 goto __err;
1213 }
1214 cptr->convert32 = (info->cpu_mode < sizeof(long));
1215 __err:
1216 snd_seq_client_unlock(cptr);
1217 return err;
1218 }
1219
1220 /* CLIENT_INFO ioctl() */
1221 static void get_client_info(struct snd_seq_client *cptr,
1222 struct snd_seq_client_info *info)
1223 {
1224 info->client = cptr->number;
1225
1226 /* fill the info fields */
1227 info->type = cptr->type;
1228 strcpy(info->name, cptr->name);
1229 info->filter = cptr->filter;
1230 info->event_lost = cptr->event_lost;
1231 memcpy(info->event_filter, cptr->event_filter, 32);
1232 info->num_ports = cptr->num_ports;
1233
1234 if (cptr->type == USER_CLIENT)
1235 info->pid = pid_vnr(cptr->data.user.owner);
1236 else
1237 info->pid = -1;
1238
1239 if (cptr->type == KERNEL_CLIENT)
1240 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1241 else
1242 info->card = -1;
1243
1244 memset(info->reserved, 0, sizeof(info->reserved));
1245 }
1246
1247 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1248 void *arg)
1249 {
1250 struct snd_seq_client_info *client_info = arg;
1251 struct snd_seq_client *cptr;
1252
1253 /* requested client number */
1254 cptr = snd_seq_client_use_ptr(client_info->client);
1255 if (cptr == NULL)
1256 return -ENOENT; /* don't change !!! */
1257
1258 get_client_info(cptr, client_info);
1259 snd_seq_client_unlock(cptr);
1260
1261 return 0;
1262 }
1263
1264
1265 /* CLIENT_INFO ioctl() */
1266 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1267 void *arg)
1268 {
1269 struct snd_seq_client_info *client_info = arg;
1270
1271 /* it is not allowed to set the info fields for an another client */
1272 if (client->number != client_info->client)
1273 return -EPERM;
1274 /* also client type must be set now */
1275 if (client->type != client_info->type)
1276 return -EINVAL;
1277
1278 /* fill the info fields */
1279 if (client_info->name[0])
1280 strscpy(client->name, client_info->name, sizeof(client->name));
1281
1282 client->filter = client_info->filter;
1283 client->event_lost = client_info->event_lost;
1284 memcpy(client->event_filter, client_info->event_filter, 32);
1285
1286 return 0;
1287 }
1288
1289
1290 /*
1291 * CREATE PORT ioctl()
1292 */
1293 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1294 {
1295 struct snd_seq_port_info *info = arg;
1296 struct snd_seq_client_port *port;
1297 struct snd_seq_port_callback *callback;
1298 int port_idx;
1299
1300 /* it is not allowed to create the port for an another client */
1301 if (info->addr.client != client->number)
1302 return -EPERM;
1303
1304 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1305 if (port == NULL)
1306 return -ENOMEM;
1307
1308 if (client->type == USER_CLIENT && info->kernel) {
1309 port_idx = port->addr.port;
1310 snd_seq_port_unlock(port);
1311 snd_seq_delete_port(client, port_idx);
1312 return -EINVAL;
1313 }
1314 if (client->type == KERNEL_CLIENT) {
1315 if ((callback = info->kernel) != NULL) {
1316 if (callback->owner)
1317 port->owner = callback->owner;
1318 port->private_data = callback->private_data;
1319 port->private_free = callback->private_free;
1320 port->event_input = callback->event_input;
1321 port->c_src.open = callback->subscribe;
1322 port->c_src.close = callback->unsubscribe;
1323 port->c_dest.open = callback->use;
1324 port->c_dest.close = callback->unuse;
1325 }
1326 }
1327
1328 info->addr = port->addr;
1329
1330 snd_seq_set_port_info(port, info);
1331 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1332 snd_seq_port_unlock(port);
1333
1334 return 0;
1335 }
1336
1337 /*
1338 * DELETE PORT ioctl()
1339 */
1340 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1341 {
1342 struct snd_seq_port_info *info = arg;
1343 int err;
1344
1345 /* it is not allowed to remove the port for an another client */
1346 if (info->addr.client != client->number)
1347 return -EPERM;
1348
1349 err = snd_seq_delete_port(client, info->addr.port);
1350 if (err >= 0)
1351 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1352 return err;
1353 }
1354
1355
1356 /*
1357 * GET_PORT_INFO ioctl() (on any client)
1358 */
1359 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1360 {
1361 struct snd_seq_port_info *info = arg;
1362 struct snd_seq_client *cptr;
1363 struct snd_seq_client_port *port;
1364
1365 cptr = snd_seq_client_use_ptr(info->addr.client);
1366 if (cptr == NULL)
1367 return -ENXIO;
1368
1369 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1370 if (port == NULL) {
1371 snd_seq_client_unlock(cptr);
1372 return -ENOENT; /* don't change */
1373 }
1374
1375 /* get port info */
1376 snd_seq_get_port_info(port, info);
1377 snd_seq_port_unlock(port);
1378 snd_seq_client_unlock(cptr);
1379
1380 return 0;
1381 }
1382
1383
1384 /*
1385 * SET_PORT_INFO ioctl() (only ports on this/own client)
1386 */
1387 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1388 {
1389 struct snd_seq_port_info *info = arg;
1390 struct snd_seq_client_port *port;
1391
1392 if (info->addr.client != client->number) /* only set our own ports ! */
1393 return -EPERM;
1394 port = snd_seq_port_use_ptr(client, info->addr.port);
1395 if (port) {
1396 snd_seq_set_port_info(port, info);
1397 snd_seq_port_unlock(port);
1398 }
1399 return 0;
1400 }
1401
1402
1403 /*
1404 * port subscription (connection)
1405 */
1406 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1407 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1408
1409 static int check_subscription_permission(struct snd_seq_client *client,
1410 struct snd_seq_client_port *sport,
1411 struct snd_seq_client_port *dport,
1412 struct snd_seq_port_subscribe *subs)
1413 {
1414 if (client->number != subs->sender.client &&
1415 client->number != subs->dest.client) {
1416 /* connection by third client - check export permission */
1417 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1418 return -EPERM;
1419 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1420 return -EPERM;
1421 }
1422
1423 /* check read permission */
1424 /* if sender or receiver is the subscribing client itself,
1425 * no permission check is necessary
1426 */
1427 if (client->number != subs->sender.client) {
1428 if (! check_port_perm(sport, PERM_RD))
1429 return -EPERM;
1430 }
1431 /* check write permission */
1432 if (client->number != subs->dest.client) {
1433 if (! check_port_perm(dport, PERM_WR))
1434 return -EPERM;
1435 }
1436 return 0;
1437 }
1438
1439 /*
1440 * send an subscription notify event to user client:
1441 * client must be user client.
1442 */
1443 int snd_seq_client_notify_subscription(int client, int port,
1444 struct snd_seq_port_subscribe *info,
1445 int evtype)
1446 {
1447 struct snd_seq_event event;
1448
1449 memset(&event, 0, sizeof(event));
1450 event.type = evtype;
1451 event.data.connect.dest = info->dest;
1452 event.data.connect.sender = info->sender;
1453
1454 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1455 }
1456
1457
1458 /*
1459 * add to port's subscription list IOCTL interface
1460 */
1461 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1462 void *arg)
1463 {
1464 struct snd_seq_port_subscribe *subs = arg;
1465 int result = -EINVAL;
1466 struct snd_seq_client *receiver = NULL, *sender = NULL;
1467 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1468
1469 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1470 goto __end;
1471 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1472 goto __end;
1473 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1474 goto __end;
1475 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1476 goto __end;
1477
1478 result = check_subscription_permission(client, sport, dport, subs);
1479 if (result < 0)
1480 goto __end;
1481
1482 /* connect them */
1483 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1484 if (! result) /* broadcast announce */
1485 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1486 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1487 __end:
1488 if (sport)
1489 snd_seq_port_unlock(sport);
1490 if (dport)
1491 snd_seq_port_unlock(dport);
1492 if (sender)
1493 snd_seq_client_unlock(sender);
1494 if (receiver)
1495 snd_seq_client_unlock(receiver);
1496 return result;
1497 }
1498
1499
1500 /*
1501 * remove from port's subscription list
1502 */
1503 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1504 void *arg)
1505 {
1506 struct snd_seq_port_subscribe *subs = arg;
1507 int result = -ENXIO;
1508 struct snd_seq_client *receiver = NULL, *sender = NULL;
1509 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1510
1511 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1512 goto __end;
1513 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1514 goto __end;
1515 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1516 goto __end;
1517 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1518 goto __end;
1519
1520 result = check_subscription_permission(client, sport, dport, subs);
1521 if (result < 0)
1522 goto __end;
1523
1524 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1525 if (! result) /* broadcast announce */
1526 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1527 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1528 __end:
1529 if (sport)
1530 snd_seq_port_unlock(sport);
1531 if (dport)
1532 snd_seq_port_unlock(dport);
1533 if (sender)
1534 snd_seq_client_unlock(sender);
1535 if (receiver)
1536 snd_seq_client_unlock(receiver);
1537 return result;
1538 }
1539
1540
1541 /* CREATE_QUEUE ioctl() */
1542 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1543 {
1544 struct snd_seq_queue_info *info = arg;
1545 struct snd_seq_queue *q;
1546
1547 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1548 if (IS_ERR(q))
1549 return PTR_ERR(q);
1550
1551 info->queue = q->queue;
1552 info->locked = q->locked;
1553 info->owner = q->owner;
1554
1555 /* set queue name */
1556 if (!info->name[0])
1557 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1558 strscpy(q->name, info->name, sizeof(q->name));
1559 snd_use_lock_free(&q->use_lock);
1560
1561 return 0;
1562 }
1563
1564 /* DELETE_QUEUE ioctl() */
1565 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1566 {
1567 struct snd_seq_queue_info *info = arg;
1568
1569 return snd_seq_queue_delete(client->number, info->queue);
1570 }
1571
1572 /* GET_QUEUE_INFO ioctl() */
1573 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1574 void *arg)
1575 {
1576 struct snd_seq_queue_info *info = arg;
1577 struct snd_seq_queue *q;
1578
1579 q = queueptr(info->queue);
1580 if (q == NULL)
1581 return -EINVAL;
1582
1583 memset(info, 0, sizeof(*info));
1584 info->queue = q->queue;
1585 info->owner = q->owner;
1586 info->locked = q->locked;
1587 strlcpy(info->name, q->name, sizeof(info->name));
1588 queuefree(q);
1589
1590 return 0;
1591 }
1592
1593 /* SET_QUEUE_INFO ioctl() */
1594 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1595 void *arg)
1596 {
1597 struct snd_seq_queue_info *info = arg;
1598 struct snd_seq_queue *q;
1599
1600 if (info->owner != client->number)
1601 return -EINVAL;
1602
1603 /* change owner/locked permission */
1604 if (snd_seq_queue_check_access(info->queue, client->number)) {
1605 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1606 return -EPERM;
1607 if (info->locked)
1608 snd_seq_queue_use(info->queue, client->number, 1);
1609 } else {
1610 return -EPERM;
1611 }
1612
1613 q = queueptr(info->queue);
1614 if (! q)
1615 return -EINVAL;
1616 if (q->owner != client->number) {
1617 queuefree(q);
1618 return -EPERM;
1619 }
1620 strscpy(q->name, info->name, sizeof(q->name));
1621 queuefree(q);
1622
1623 return 0;
1624 }
1625
1626 /* GET_NAMED_QUEUE ioctl() */
1627 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1628 void *arg)
1629 {
1630 struct snd_seq_queue_info *info = arg;
1631 struct snd_seq_queue *q;
1632
1633 q = snd_seq_queue_find_name(info->name);
1634 if (q == NULL)
1635 return -EINVAL;
1636 info->queue = q->queue;
1637 info->owner = q->owner;
1638 info->locked = q->locked;
1639 queuefree(q);
1640
1641 return 0;
1642 }
1643
1644 /* GET_QUEUE_STATUS ioctl() */
1645 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1646 void *arg)
1647 {
1648 struct snd_seq_queue_status *status = arg;
1649 struct snd_seq_queue *queue;
1650 struct snd_seq_timer *tmr;
1651
1652 queue = queueptr(status->queue);
1653 if (queue == NULL)
1654 return -EINVAL;
1655 memset(status, 0, sizeof(*status));
1656 status->queue = queue->queue;
1657
1658 tmr = queue->timer;
1659 status->events = queue->tickq->cells + queue->timeq->cells;
1660
1661 status->time = snd_seq_timer_get_cur_time(tmr, true);
1662 status->tick = snd_seq_timer_get_cur_tick(tmr);
1663
1664 status->running = tmr->running;
1665
1666 status->flags = queue->flags;
1667 queuefree(queue);
1668
1669 return 0;
1670 }
1671
1672
1673 /* GET_QUEUE_TEMPO ioctl() */
1674 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1675 void *arg)
1676 {
1677 struct snd_seq_queue_tempo *tempo = arg;
1678 struct snd_seq_queue *queue;
1679 struct snd_seq_timer *tmr;
1680
1681 queue = queueptr(tempo->queue);
1682 if (queue == NULL)
1683 return -EINVAL;
1684 memset(tempo, 0, sizeof(*tempo));
1685 tempo->queue = queue->queue;
1686
1687 tmr = queue->timer;
1688
1689 tempo->tempo = tmr->tempo;
1690 tempo->ppq = tmr->ppq;
1691 tempo->skew_value = tmr->skew;
1692 tempo->skew_base = tmr->skew_base;
1693 queuefree(queue);
1694
1695 return 0;
1696 }
1697
1698
1699 /* SET_QUEUE_TEMPO ioctl() */
1700 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1701 {
1702 if (!snd_seq_queue_check_access(tempo->queue, client))
1703 return -EPERM;
1704 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1705 }
1706 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1707
1708 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1709 void *arg)
1710 {
1711 struct snd_seq_queue_tempo *tempo = arg;
1712 int result;
1713
1714 result = snd_seq_set_queue_tempo(client->number, tempo);
1715 return result < 0 ? result : 0;
1716 }
1717
1718
1719 /* GET_QUEUE_TIMER ioctl() */
1720 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1721 void *arg)
1722 {
1723 struct snd_seq_queue_timer *timer = arg;
1724 struct snd_seq_queue *queue;
1725 struct snd_seq_timer *tmr;
1726
1727 queue = queueptr(timer->queue);
1728 if (queue == NULL)
1729 return -EINVAL;
1730
1731 mutex_lock(&queue->timer_mutex);
1732 tmr = queue->timer;
1733 memset(timer, 0, sizeof(*timer));
1734 timer->queue = queue->queue;
1735
1736 timer->type = tmr->type;
1737 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1738 timer->u.alsa.id = tmr->alsa_id;
1739 timer->u.alsa.resolution = tmr->preferred_resolution;
1740 }
1741 mutex_unlock(&queue->timer_mutex);
1742 queuefree(queue);
1743
1744 return 0;
1745 }
1746
1747
1748 /* SET_QUEUE_TIMER ioctl() */
1749 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1750 void *arg)
1751 {
1752 struct snd_seq_queue_timer *timer = arg;
1753 int result = 0;
1754
1755 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1756 return -EINVAL;
1757
1758 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1759 struct snd_seq_queue *q;
1760 struct snd_seq_timer *tmr;
1761
1762 q = queueptr(timer->queue);
1763 if (q == NULL)
1764 return -ENXIO;
1765 mutex_lock(&q->timer_mutex);
1766 tmr = q->timer;
1767 snd_seq_queue_timer_close(timer->queue);
1768 tmr->type = timer->type;
1769 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1770 tmr->alsa_id = timer->u.alsa.id;
1771 tmr->preferred_resolution = timer->u.alsa.resolution;
1772 }
1773 result = snd_seq_queue_timer_open(timer->queue);
1774 mutex_unlock(&q->timer_mutex);
1775 queuefree(q);
1776 } else {
1777 return -EPERM;
1778 }
1779
1780 return result;
1781 }
1782
1783
1784 /* GET_QUEUE_CLIENT ioctl() */
1785 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1786 void *arg)
1787 {
1788 struct snd_seq_queue_client *info = arg;
1789 int used;
1790
1791 used = snd_seq_queue_is_used(info->queue, client->number);
1792 if (used < 0)
1793 return -EINVAL;
1794 info->used = used;
1795 info->client = client->number;
1796
1797 return 0;
1798 }
1799
1800
1801 /* SET_QUEUE_CLIENT ioctl() */
1802 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1803 void *arg)
1804 {
1805 struct snd_seq_queue_client *info = arg;
1806 int err;
1807
1808 if (info->used >= 0) {
1809 err = snd_seq_queue_use(info->queue, client->number, info->used);
1810 if (err < 0)
1811 return err;
1812 }
1813
1814 return snd_seq_ioctl_get_queue_client(client, arg);
1815 }
1816
1817
1818 /* GET_CLIENT_POOL ioctl() */
1819 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1820 void *arg)
1821 {
1822 struct snd_seq_client_pool *info = arg;
1823 struct snd_seq_client *cptr;
1824
1825 cptr = snd_seq_client_use_ptr(info->client);
1826 if (cptr == NULL)
1827 return -ENOENT;
1828 memset(info, 0, sizeof(*info));
1829 info->client = cptr->number;
1830 info->output_pool = cptr->pool->size;
1831 info->output_room = cptr->pool->room;
1832 info->output_free = info->output_pool;
1833 info->output_free = snd_seq_unused_cells(cptr->pool);
1834 if (cptr->type == USER_CLIENT) {
1835 info->input_pool = cptr->data.user.fifo_pool_size;
1836 info->input_free = info->input_pool;
1837 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
1838 } else {
1839 info->input_pool = 0;
1840 info->input_free = 0;
1841 }
1842 snd_seq_client_unlock(cptr);
1843
1844 return 0;
1845 }
1846
1847 /* SET_CLIENT_POOL ioctl() */
1848 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1849 void *arg)
1850 {
1851 struct snd_seq_client_pool *info = arg;
1852 int rc;
1853
1854 if (client->number != info->client)
1855 return -EINVAL; /* can't change other clients */
1856
1857 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1858 (! snd_seq_write_pool_allocated(client) ||
1859 info->output_pool != client->pool->size)) {
1860 if (snd_seq_write_pool_allocated(client)) {
1861 /* is the pool in use? */
1862 if (atomic_read(&client->pool->counter))
1863 return -EBUSY;
1864 /* remove all existing cells */
1865 snd_seq_pool_mark_closing(client->pool);
1866 snd_seq_pool_done(client->pool);
1867 }
1868 client->pool->size = info->output_pool;
1869 rc = snd_seq_pool_init(client->pool);
1870 if (rc < 0)
1871 return rc;
1872 }
1873 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1874 info->input_pool >= 1 &&
1875 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1876 info->input_pool != client->data.user.fifo_pool_size) {
1877 /* change pool size */
1878 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1879 if (rc < 0)
1880 return rc;
1881 client->data.user.fifo_pool_size = info->input_pool;
1882 }
1883 if (info->output_room >= 1 &&
1884 info->output_room <= client->pool->size) {
1885 client->pool->room = info->output_room;
1886 }
1887
1888 return snd_seq_ioctl_get_client_pool(client, arg);
1889 }
1890
1891
1892 /* REMOVE_EVENTS ioctl() */
1893 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1894 void *arg)
1895 {
1896 struct snd_seq_remove_events *info = arg;
1897
1898 /*
1899 * Input mostly not implemented XXX.
1900 */
1901 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1902 /*
1903 * No restrictions so for a user client we can clear
1904 * the whole fifo
1905 */
1906 if (client->type == USER_CLIENT && client->data.user.fifo)
1907 snd_seq_fifo_clear(client->data.user.fifo);
1908 }
1909
1910 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1911 snd_seq_queue_remove_cells(client->number, info);
1912
1913 return 0;
1914 }
1915
1916
1917 /*
1918 * get subscription info
1919 */
1920 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1921 void *arg)
1922 {
1923 struct snd_seq_port_subscribe *subs = arg;
1924 int result;
1925 struct snd_seq_client *sender = NULL;
1926 struct snd_seq_client_port *sport = NULL;
1927
1928 result = -EINVAL;
1929 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1930 goto __end;
1931 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1932 goto __end;
1933 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest,
1934 subs);
1935 __end:
1936 if (sport)
1937 snd_seq_port_unlock(sport);
1938 if (sender)
1939 snd_seq_client_unlock(sender);
1940
1941 return result;
1942 }
1943
1944
1945 /*
1946 * get subscription info - check only its presence
1947 */
1948 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1949 {
1950 struct snd_seq_query_subs *subs = arg;
1951 int result = -ENXIO;
1952 struct snd_seq_client *cptr = NULL;
1953 struct snd_seq_client_port *port = NULL;
1954 struct snd_seq_port_subs_info *group;
1955 struct list_head *p;
1956 int i;
1957
1958 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1959 goto __end;
1960 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1961 goto __end;
1962
1963 switch (subs->type) {
1964 case SNDRV_SEQ_QUERY_SUBS_READ:
1965 group = &port->c_src;
1966 break;
1967 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1968 group = &port->c_dest;
1969 break;
1970 default:
1971 goto __end;
1972 }
1973
1974 down_read(&group->list_mutex);
1975 /* search for the subscriber */
1976 subs->num_subs = group->count;
1977 i = 0;
1978 result = -ENOENT;
1979 list_for_each(p, &group->list_head) {
1980 if (i++ == subs->index) {
1981 /* found! */
1982 struct snd_seq_subscribers *s;
1983 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1984 s = list_entry(p, struct snd_seq_subscribers, src_list);
1985 subs->addr = s->info.dest;
1986 } else {
1987 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1988 subs->addr = s->info.sender;
1989 }
1990 subs->flags = s->info.flags;
1991 subs->queue = s->info.queue;
1992 result = 0;
1993 break;
1994 }
1995 }
1996 up_read(&group->list_mutex);
1997
1998 __end:
1999 if (port)
2000 snd_seq_port_unlock(port);
2001 if (cptr)
2002 snd_seq_client_unlock(cptr);
2003
2004 return result;
2005 }
2006
2007
2008 /*
2009 * query next client
2010 */
2011 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2012 void *arg)
2013 {
2014 struct snd_seq_client_info *info = arg;
2015 struct snd_seq_client *cptr = NULL;
2016
2017 /* search for next client */
2018 if (info->client < INT_MAX)
2019 info->client++;
2020 if (info->client < 0)
2021 info->client = 0;
2022 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2023 cptr = snd_seq_client_use_ptr(info->client);
2024 if (cptr)
2025 break; /* found */
2026 }
2027 if (cptr == NULL)
2028 return -ENOENT;
2029
2030 get_client_info(cptr, info);
2031 snd_seq_client_unlock(cptr);
2032
2033 return 0;
2034 }
2035
2036 /*
2037 * query next port
2038 */
2039 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2040 void *arg)
2041 {
2042 struct snd_seq_port_info *info = arg;
2043 struct snd_seq_client *cptr;
2044 struct snd_seq_client_port *port = NULL;
2045
2046 cptr = snd_seq_client_use_ptr(info->addr.client);
2047 if (cptr == NULL)
2048 return -ENXIO;
2049
2050 /* search for next port */
2051 info->addr.port++;
2052 port = snd_seq_port_query_nearest(cptr, info);
2053 if (port == NULL) {
2054 snd_seq_client_unlock(cptr);
2055 return -ENOENT;
2056 }
2057
2058 /* get port info */
2059 info->addr = port->addr;
2060 snd_seq_get_port_info(port, info);
2061 snd_seq_port_unlock(port);
2062 snd_seq_client_unlock(cptr);
2063
2064 return 0;
2065 }
2066
2067 /* -------------------------------------------------------- */
2068
2069 static const struct ioctl_handler {
2070 unsigned int cmd;
2071 int (*func)(struct snd_seq_client *client, void *arg);
2072 } ioctl_handlers[] = {
2073 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2074 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2075 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2076 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2077 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2078 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2079 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2080 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2081 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2082 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2083 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2084 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2085 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2086 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2087 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2088 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2089 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2090 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2091 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2092 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2093 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2094 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2095 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2096 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2097 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2098 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2099 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2100 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2101 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2102 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2103 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2104 { 0, NULL },
2105 };
2106
2107 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2108 unsigned long arg)
2109 {
2110 struct snd_seq_client *client = file->private_data;
2111 /* To use kernel stack for ioctl data. */
2112 union {
2113 int pversion;
2114 int client_id;
2115 struct snd_seq_system_info system_info;
2116 struct snd_seq_running_info running_info;
2117 struct snd_seq_client_info client_info;
2118 struct snd_seq_port_info port_info;
2119 struct snd_seq_port_subscribe port_subscribe;
2120 struct snd_seq_queue_info queue_info;
2121 struct snd_seq_queue_status queue_status;
2122 struct snd_seq_queue_tempo tempo;
2123 struct snd_seq_queue_timer queue_timer;
2124 struct snd_seq_queue_client queue_client;
2125 struct snd_seq_client_pool client_pool;
2126 struct snd_seq_remove_events remove_events;
2127 struct snd_seq_query_subs query_subs;
2128 } buf;
2129 const struct ioctl_handler *handler;
2130 unsigned long size;
2131 int err;
2132
2133 if (snd_BUG_ON(!client))
2134 return -ENXIO;
2135
2136 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2137 if (handler->cmd == cmd)
2138 break;
2139 }
2140 if (handler->cmd == 0)
2141 return -ENOTTY;
2142
2143 memset(&buf, 0, sizeof(buf));
2144
2145 /*
2146 * All of ioctl commands for ALSA sequencer get an argument of size
2147 * within 13 bits. We can safely pick up the size from the command.
2148 */
2149 size = _IOC_SIZE(handler->cmd);
2150 if (handler->cmd & IOC_IN) {
2151 if (copy_from_user(&buf, (const void __user *)arg, size))
2152 return -EFAULT;
2153 }
2154
2155 mutex_lock(&client->ioctl_mutex);
2156 err = handler->func(client, &buf);
2157 mutex_unlock(&client->ioctl_mutex);
2158 if (err >= 0) {
2159 /* Some commands includes a bug in 'dir' field. */
2160 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2161 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2162 (handler->cmd & IOC_OUT))
2163 if (copy_to_user((void __user *)arg, &buf, size))
2164 return -EFAULT;
2165 }
2166
2167 return err;
2168 }
2169
2170 #ifdef CONFIG_COMPAT
2171 #include "seq_compat.c"
2172 #else
2173 #define snd_seq_ioctl_compat NULL
2174 #endif
2175
2176 /* -------------------------------------------------------- */
2177
2178
2179 /* exported to kernel modules */
2180 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2181 const char *name_fmt, ...)
2182 {
2183 struct snd_seq_client *client;
2184 va_list args;
2185
2186 if (snd_BUG_ON(in_interrupt()))
2187 return -EBUSY;
2188
2189 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2190 return -EINVAL;
2191 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2192 return -EINVAL;
2193
2194 mutex_lock(&register_mutex);
2195
2196 if (card) {
2197 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2198 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2199 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2200 client_index = -1;
2201 }
2202
2203 /* empty write queue as default */
2204 client = seq_create_client1(client_index, 0);
2205 if (client == NULL) {
2206 mutex_unlock(&register_mutex);
2207 return -EBUSY; /* failure code */
2208 }
2209 usage_alloc(&client_usage, 1);
2210
2211 client->accept_input = 1;
2212 client->accept_output = 1;
2213 client->data.kernel.card = card;
2214
2215 va_start(args, name_fmt);
2216 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2217 va_end(args);
2218
2219 client->type = KERNEL_CLIENT;
2220 mutex_unlock(&register_mutex);
2221
2222 /* make others aware this new client */
2223 snd_seq_system_client_ev_client_start(client->number);
2224
2225 /* return client number to caller */
2226 return client->number;
2227 }
2228 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2229
2230 /* exported to kernel modules */
2231 int snd_seq_delete_kernel_client(int client)
2232 {
2233 struct snd_seq_client *ptr;
2234
2235 if (snd_BUG_ON(in_interrupt()))
2236 return -EBUSY;
2237
2238 ptr = clientptr(client);
2239 if (ptr == NULL)
2240 return -EINVAL;
2241
2242 seq_free_client(ptr);
2243 kfree(ptr);
2244 return 0;
2245 }
2246 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2247
2248 /*
2249 * exported, called by kernel clients to enqueue events (w/o blocking)
2250 *
2251 * RETURN VALUE: zero if succeed, negative if error
2252 */
2253 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev,
2254 struct file *file, bool blocking)
2255 {
2256 struct snd_seq_client *cptr;
2257 int result;
2258
2259 if (snd_BUG_ON(!ev))
2260 return -EINVAL;
2261
2262 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2263 return 0; /* ignore this */
2264 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2265 return -EINVAL; /* quoted events can't be enqueued */
2266
2267 /* fill in client number */
2268 ev->source.client = client;
2269
2270 if (check_event_type_and_length(ev))
2271 return -EINVAL;
2272
2273 cptr = snd_seq_client_use_ptr(client);
2274 if (cptr == NULL)
2275 return -EINVAL;
2276
2277 if (!cptr->accept_output) {
2278 result = -EPERM;
2279 } else { /* send it */
2280 mutex_lock(&cptr->ioctl_mutex);
2281 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2282 false, 0,
2283 &cptr->ioctl_mutex);
2284 mutex_unlock(&cptr->ioctl_mutex);
2285 }
2286
2287 snd_seq_client_unlock(cptr);
2288 return result;
2289 }
2290 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2291
2292 /*
2293 * exported, called by kernel clients to dispatch events directly to other
2294 * clients, bypassing the queues. Event time-stamp will be updated.
2295 *
2296 * RETURN VALUE: negative = delivery failed,
2297 * zero, or positive: the number of delivered events
2298 */
2299 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2300 int atomic, int hop)
2301 {
2302 struct snd_seq_client *cptr;
2303 int result;
2304
2305 if (snd_BUG_ON(!ev))
2306 return -EINVAL;
2307
2308 /* fill in client number */
2309 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2310 ev->source.client = client;
2311
2312 if (check_event_type_and_length(ev))
2313 return -EINVAL;
2314
2315 cptr = snd_seq_client_use_ptr(client);
2316 if (cptr == NULL)
2317 return -EINVAL;
2318
2319 if (!cptr->accept_output)
2320 result = -EPERM;
2321 else
2322 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2323
2324 snd_seq_client_unlock(cptr);
2325 return result;
2326 }
2327 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2328
2329 /**
2330 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2331 * kernel space.
2332 * @clientid: A numerical ID for a client.
2333 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2334 * @arg: A pointer to data in kernel space.
2335 *
2336 * Against its name, both kernel/application client can be handled by this
2337 * kernel API. A pointer of 'arg' argument should be in kernel space.
2338 *
2339 * Return: 0 at success. Negative error code at failure.
2340 */
2341 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2342 {
2343 const struct ioctl_handler *handler;
2344 struct snd_seq_client *client;
2345
2346 client = clientptr(clientid);
2347 if (client == NULL)
2348 return -ENXIO;
2349
2350 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2351 if (handler->cmd == cmd)
2352 return handler->func(client, arg);
2353 }
2354
2355 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2356 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2357 return -ENOTTY;
2358 }
2359 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2360
2361 /* exported (for OSS emulator) */
2362 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2363 {
2364 struct snd_seq_client *client;
2365
2366 client = clientptr(clientid);
2367 if (client == NULL)
2368 return -ENXIO;
2369
2370 if (! snd_seq_write_pool_allocated(client))
2371 return 1;
2372 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2373 return 1;
2374 return 0;
2375 }
2376 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2377
2378 /*---------------------------------------------------------------------------*/
2379
2380 #ifdef CONFIG_SND_PROC_FS
2381 /*
2382 * /proc interface
2383 */
2384 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2385 struct snd_seq_port_subs_info *group,
2386 int is_src, char *msg)
2387 {
2388 struct list_head *p;
2389 struct snd_seq_subscribers *s;
2390 int count = 0;
2391
2392 down_read(&group->list_mutex);
2393 if (list_empty(&group->list_head)) {
2394 up_read(&group->list_mutex);
2395 return;
2396 }
2397 snd_iprintf(buffer, msg);
2398 list_for_each(p, &group->list_head) {
2399 if (is_src)
2400 s = list_entry(p, struct snd_seq_subscribers, src_list);
2401 else
2402 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2403 if (count++)
2404 snd_iprintf(buffer, ", ");
2405 snd_iprintf(buffer, "%d:%d",
2406 is_src ? s->info.dest.client : s->info.sender.client,
2407 is_src ? s->info.dest.port : s->info.sender.port);
2408 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2409 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2410 if (group->exclusive)
2411 snd_iprintf(buffer, "[ex]");
2412 }
2413 up_read(&group->list_mutex);
2414 snd_iprintf(buffer, "\n");
2415 }
2416
2417 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2418 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2419 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2420
2421 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2422
2423 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2424 struct snd_seq_client *client)
2425 {
2426 struct snd_seq_client_port *p;
2427
2428 mutex_lock(&client->ports_mutex);
2429 list_for_each_entry(p, &client->ports_list_head, list) {
2430 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2431 p->addr.port, p->name,
2432 FLAG_PERM_RD(p->capability),
2433 FLAG_PERM_WR(p->capability),
2434 FLAG_PERM_EX(p->capability),
2435 FLAG_PERM_DUPLEX(p->capability));
2436 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2437 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2438 }
2439 mutex_unlock(&client->ports_mutex);
2440 }
2441
2442
2443 /* exported to seq_info.c */
2444 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2445 struct snd_info_buffer *buffer)
2446 {
2447 int c;
2448 struct snd_seq_client *client;
2449
2450 snd_iprintf(buffer, "Client info\n");
2451 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2452 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2453 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2454 snd_iprintf(buffer, "\n");
2455
2456 /* list the client table */
2457 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2458 client = snd_seq_client_use_ptr(c);
2459 if (client == NULL)
2460 continue;
2461 if (client->type == NO_CLIENT) {
2462 snd_seq_client_unlock(client);
2463 continue;
2464 }
2465
2466 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2467 c, client->name,
2468 client->type == USER_CLIENT ? "User" : "Kernel");
2469 snd_seq_info_dump_ports(buffer, client);
2470 if (snd_seq_write_pool_allocated(client)) {
2471 snd_iprintf(buffer, " Output pool :\n");
2472 snd_seq_info_pool(buffer, client->pool, " ");
2473 }
2474 if (client->type == USER_CLIENT && client->data.user.fifo &&
2475 client->data.user.fifo->pool) {
2476 snd_iprintf(buffer, " Input pool :\n");
2477 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2478 }
2479 snd_seq_client_unlock(client);
2480 }
2481 }
2482 #endif /* CONFIG_SND_PROC_FS */
2483
2484 /*---------------------------------------------------------------------------*/
2485
2486
2487 /*
2488 * REGISTRATION PART
2489 */
2490
2491 static const struct file_operations snd_seq_f_ops =
2492 {
2493 .owner = THIS_MODULE,
2494 .read = snd_seq_read,
2495 .write = snd_seq_write,
2496 .open = snd_seq_open,
2497 .release = snd_seq_release,
2498 .llseek = no_llseek,
2499 .poll = snd_seq_poll,
2500 .unlocked_ioctl = snd_seq_ioctl,
2501 .compat_ioctl = snd_seq_ioctl_compat,
2502 };
2503
2504 static struct device seq_dev;
2505
2506 /*
2507 * register sequencer device
2508 */
2509 int __init snd_sequencer_device_init(void)
2510 {
2511 int err;
2512
2513 snd_device_initialize(&seq_dev, NULL);
2514 dev_set_name(&seq_dev, "seq");
2515
2516 mutex_lock(&register_mutex);
2517 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2518 &snd_seq_f_ops, NULL, &seq_dev);
2519 mutex_unlock(&register_mutex);
2520 if (err < 0) {
2521 put_device(&seq_dev);
2522 return err;
2523 }
2524
2525 return 0;
2526 }
2527
2528
2529
2530 /*
2531 * unregister sequencer device
2532 */
2533 void snd_sequencer_device_done(void)
2534 {
2535 snd_unregister_device(&seq_dev);
2536 put_device(&seq_dev);
2537 }
Linux with added FPC-III support