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Linux 4.16.11
[linux/fpc-iii.git] / sound / core / seq / seq_clientmgr.c
blob61a07fe34cd271e60dc0c31a7dddae750c2532b1
1 /*
2 * ALSA sequencer Client Manager
3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@perex.cz>
5 * Takashi Iwai <tiwai@suse.de>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24 #include <linux/init.h>
25 #include <linux/export.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <linux/kmod.h>
30
31 #include <sound/seq_kernel.h>
32 #include "seq_clientmgr.h"
33 #include "seq_memory.h"
34 #include "seq_queue.h"
35 #include "seq_timer.h"
36 #include "seq_info.h"
37 #include "seq_system.h"
38 #include <sound/seq_device.h>
39 #ifdef CONFIG_COMPAT
40 #include <linux/compat.h>
41 #endif
42
43 /* Client Manager
44
45 * this module handles the connections of userland and kernel clients
46 *
47 */
48
49 /*
50 * There are four ranges of client numbers (last two shared):
51 * 0..15: global clients
52 * 16..127: statically allocated client numbers for cards 0..27
53 * 128..191: dynamically allocated client numbers for cards 28..31
54 * 128..191: dynamically allocated client numbers for applications
55 */
56
57 /* number of kernel non-card clients */
58 #define SNDRV_SEQ_GLOBAL_CLIENTS 16
59 /* clients per cards, for static clients */
60 #define SNDRV_SEQ_CLIENTS_PER_CARD 4
61 /* dynamically allocated client numbers (both kernel drivers and user space) */
62 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
63
64 #define SNDRV_SEQ_LFLG_INPUT 0x0001
65 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
66 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
67
68 static DEFINE_SPINLOCK(clients_lock);
69 static DEFINE_MUTEX(register_mutex);
70
71 /*
72 * client table
73 */
74 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
75 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
76 static struct snd_seq_usage client_usage;
77
78 /*
79 * prototypes
80 */
81 static int bounce_error_event(struct snd_seq_client *client,
82 struct snd_seq_event *event,
83 int err, int atomic, int hop);
84 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
85 struct snd_seq_event *event,
86 int filter, int atomic, int hop);
87
88 /*
89 */
90 static inline unsigned short snd_seq_file_flags(struct file *file)
91 {
92 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
93 case FMODE_WRITE:
94 return SNDRV_SEQ_LFLG_OUTPUT;
95 case FMODE_READ:
96 return SNDRV_SEQ_LFLG_INPUT;
97 default:
98 return SNDRV_SEQ_LFLG_OPEN;
99 }
100 }
101
102 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
103 {
104 return snd_seq_total_cells(client->pool) > 0;
105 }
106
107 /* return pointer to client structure for specified id */
108 static struct snd_seq_client *clientptr(int clientid)
109 {
110 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
111 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
112 clientid);
113 return NULL;
114 }
115 return clienttab[clientid];
116 }
117
118 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
119 {
120 unsigned long flags;
121 struct snd_seq_client *client;
122
123 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
124 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
125 clientid);
126 return NULL;
127 }
128 spin_lock_irqsave(&clients_lock, flags);
129 client = clientptr(clientid);
130 if (client)
131 goto __lock;
132 if (clienttablock[clientid]) {
133 spin_unlock_irqrestore(&clients_lock, flags);
134 return NULL;
135 }
136 spin_unlock_irqrestore(&clients_lock, flags);
137 #ifdef CONFIG_MODULES
138 if (!in_interrupt()) {
139 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
140 static char card_requested[SNDRV_CARDS];
141 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
142 int idx;
143
144 if (!client_requested[clientid]) {
145 client_requested[clientid] = 1;
146 for (idx = 0; idx < 15; idx++) {
147 if (seq_client_load[idx] < 0)
148 break;
149 if (seq_client_load[idx] == clientid) {
150 request_module("snd-seq-client-%i",
151 clientid);
152 break;
153 }
154 }
155 }
156 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
157 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
158 SNDRV_SEQ_CLIENTS_PER_CARD;
159 if (card < snd_ecards_limit) {
160 if (! card_requested[card]) {
161 card_requested[card] = 1;
162 snd_request_card(card);
163 }
164 snd_seq_device_load_drivers();
165 }
166 }
167 spin_lock_irqsave(&clients_lock, flags);
168 client = clientptr(clientid);
169 if (client)
170 goto __lock;
171 spin_unlock_irqrestore(&clients_lock, flags);
172 }
173 #endif
174 return NULL;
175
176 __lock:
177 snd_use_lock_use(&client->use_lock);
178 spin_unlock_irqrestore(&clients_lock, flags);
179 return client;
180 }
181
182 static void usage_alloc(struct snd_seq_usage *res, int num)
183 {
184 res->cur += num;
185 if (res->cur > res->peak)
186 res->peak = res->cur;
187 }
188
189 static void usage_free(struct snd_seq_usage *res, int num)
190 {
191 res->cur -= num;
192 }
193
194 /* initialise data structures */
195 int __init client_init_data(void)
196 {
197 /* zap out the client table */
198 memset(&clienttablock, 0, sizeof(clienttablock));
199 memset(&clienttab, 0, sizeof(clienttab));
200 return 0;
201 }
202
203
204 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
205 {
206 unsigned long flags;
207 int c;
208 struct snd_seq_client *client;
209
210 /* init client data */
211 client = kzalloc(sizeof(*client), GFP_KERNEL);
212 if (client == NULL)
213 return NULL;
214 client->pool = snd_seq_pool_new(poolsize);
215 if (client->pool == NULL) {
216 kfree(client);
217 return NULL;
218 }
219 client->type = NO_CLIENT;
220 snd_use_lock_init(&client->use_lock);
221 rwlock_init(&client->ports_lock);
222 mutex_init(&client->ports_mutex);
223 INIT_LIST_HEAD(&client->ports_list_head);
224 mutex_init(&client->ioctl_mutex);
225
226 /* find free slot in the client table */
227 spin_lock_irqsave(&clients_lock, flags);
228 if (client_index < 0) {
229 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
230 c < SNDRV_SEQ_MAX_CLIENTS;
231 c++) {
232 if (clienttab[c] || clienttablock[c])
233 continue;
234 clienttab[client->number = c] = client;
235 spin_unlock_irqrestore(&clients_lock, flags);
236 return client;
237 }
238 } else {
239 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
240 clienttab[client->number = client_index] = client;
241 spin_unlock_irqrestore(&clients_lock, flags);
242 return client;
243 }
244 }
245 spin_unlock_irqrestore(&clients_lock, flags);
246 snd_seq_pool_delete(&client->pool);
247 kfree(client);
248 return NULL; /* no free slot found or busy, return failure code */
249 }
250
251
252 static int seq_free_client1(struct snd_seq_client *client)
253 {
254 unsigned long flags;
255
256 if (!client)
257 return 0;
258 spin_lock_irqsave(&clients_lock, flags);
259 clienttablock[client->number] = 1;
260 clienttab[client->number] = NULL;
261 spin_unlock_irqrestore(&clients_lock, flags);
262 snd_seq_delete_all_ports(client);
263 snd_seq_queue_client_leave(client->number);
264 snd_use_lock_sync(&client->use_lock);
265 snd_seq_queue_client_termination(client->number);
266 if (client->pool)
267 snd_seq_pool_delete(&client->pool);
268 spin_lock_irqsave(&clients_lock, flags);
269 clienttablock[client->number] = 0;
270 spin_unlock_irqrestore(&clients_lock, flags);
271 return 0;
272 }
273
274
275 static void seq_free_client(struct snd_seq_client * client)
276 {
277 mutex_lock(&register_mutex);
278 switch (client->type) {
279 case NO_CLIENT:
280 pr_warn("ALSA: seq: Trying to free unused client %d\n",
281 client->number);
282 break;
283 case USER_CLIENT:
284 case KERNEL_CLIENT:
285 seq_free_client1(client);
286 usage_free(&client_usage, 1);
287 break;
288
289 default:
290 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
291 client->number, client->type);
292 }
293 mutex_unlock(&register_mutex);
294
295 snd_seq_system_client_ev_client_exit(client->number);
296 }
297
298
299
300 /* -------------------------------------------------------- */
301
302 /* create a user client */
303 static int snd_seq_open(struct inode *inode, struct file *file)
304 {
305 int c, mode; /* client id */
306 struct snd_seq_client *client;
307 struct snd_seq_user_client *user;
308 int err;
309
310 err = nonseekable_open(inode, file);
311 if (err < 0)
312 return err;
313
314 if (mutex_lock_interruptible(&register_mutex))
315 return -ERESTARTSYS;
316 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
317 if (client == NULL) {
318 mutex_unlock(&register_mutex);
319 return -ENOMEM; /* failure code */
320 }
321
322 mode = snd_seq_file_flags(file);
323 if (mode & SNDRV_SEQ_LFLG_INPUT)
324 client->accept_input = 1;
325 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
326 client->accept_output = 1;
327
328 user = &client->data.user;
329 user->fifo = NULL;
330 user->fifo_pool_size = 0;
331
332 if (mode & SNDRV_SEQ_LFLG_INPUT) {
333 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
334 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
335 if (user->fifo == NULL) {
336 seq_free_client1(client);
337 kfree(client);
338 mutex_unlock(&register_mutex);
339 return -ENOMEM;
340 }
341 }
342
343 usage_alloc(&client_usage, 1);
344 client->type = USER_CLIENT;
345 mutex_unlock(&register_mutex);
346
347 c = client->number;
348 file->private_data = client;
349
350 /* fill client data */
351 user->file = file;
352 sprintf(client->name, "Client-%d", c);
353 client->data.user.owner = get_pid(task_pid(current));
354
355 /* make others aware this new client */
356 snd_seq_system_client_ev_client_start(c);
357
358 return 0;
359 }
360
361 /* delete a user client */
362 static int snd_seq_release(struct inode *inode, struct file *file)
363 {
364 struct snd_seq_client *client = file->private_data;
365
366 if (client) {
367 seq_free_client(client);
368 if (client->data.user.fifo)
369 snd_seq_fifo_delete(&client->data.user.fifo);
370 put_pid(client->data.user.owner);
371 kfree(client);
372 }
373
374 return 0;
375 }
376
377
378 /* handle client read() */
379 /* possible error values:
380 * -ENXIO invalid client or file open mode
381 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
382 * -EINVAL no enough user-space buffer to write the whole event
383 * -EFAULT seg. fault during copy to user space
384 */
385 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
386 loff_t *offset)
387 {
388 struct snd_seq_client *client = file->private_data;
389 struct snd_seq_fifo *fifo;
390 int err;
391 long result = 0;
392 struct snd_seq_event_cell *cell;
393
394 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
395 return -ENXIO;
396
397 if (!access_ok(VERIFY_WRITE, buf, count))
398 return -EFAULT;
399
400 /* check client structures are in place */
401 if (snd_BUG_ON(!client))
402 return -ENXIO;
403
404 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
405 return -ENXIO;
406
407 if (atomic_read(&fifo->overflow) > 0) {
408 /* buffer overflow is detected */
409 snd_seq_fifo_clear(fifo);
410 /* return error code */
411 return -ENOSPC;
412 }
413
414 cell = NULL;
415 err = 0;
416 snd_seq_fifo_lock(fifo);
417
418 /* while data available in queue */
419 while (count >= sizeof(struct snd_seq_event)) {
420 int nonblock;
421
422 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
423 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
424 break;
425 }
426 if (snd_seq_ev_is_variable(&cell->event)) {
427 struct snd_seq_event tmpev;
428 tmpev = cell->event;
429 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
430 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
431 err = -EFAULT;
432 break;
433 }
434 count -= sizeof(struct snd_seq_event);
435 buf += sizeof(struct snd_seq_event);
436 err = snd_seq_expand_var_event(&cell->event, count,
437 (char __force *)buf, 0,
438 sizeof(struct snd_seq_event));
439 if (err < 0)
440 break;
441 result += err;
442 count -= err;
443 buf += err;
444 } else {
445 if (copy_to_user(buf, &cell->event, 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 }
452 snd_seq_cell_free(cell);
453 cell = NULL; /* to be sure */
454 result += sizeof(struct snd_seq_event);
455 }
456
457 if (err < 0) {
458 if (cell)
459 snd_seq_fifo_cell_putback(fifo, cell);
460 if (err == -EAGAIN && result > 0)
461 err = 0;
462 }
463 snd_seq_fifo_unlock(fifo);
464
465 return (err < 0) ? err : result;
466 }
467
468
469 /*
470 * check access permission to the port
471 */
472 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
473 {
474 if ((port->capability & flags) != flags)
475 return 0;
476 return flags;
477 }
478
479 /*
480 * check if the destination client is available, and return the pointer
481 * if filter is non-zero, client filter bitmap is tested.
482 */
483 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
484 int filter)
485 {
486 struct snd_seq_client *dest;
487
488 dest = snd_seq_client_use_ptr(event->dest.client);
489 if (dest == NULL)
490 return NULL;
491 if (! dest->accept_input)
492 goto __not_avail;
493 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
494 ! test_bit(event->type, dest->event_filter))
495 goto __not_avail;
496 if (filter && !(dest->filter & filter))
497 goto __not_avail;
498
499 return dest; /* ok - accessible */
500 __not_avail:
501 snd_seq_client_unlock(dest);
502 return NULL;
503 }
504
505
506 /*
507 * Return the error event.
508 *
509 * If the receiver client is a user client, the original event is
510 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
511 * the original event is also variable length, the external data is
512 * copied after the event record.
513 * If the receiver client is a kernel client, the original event is
514 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
515 * kmalloc.
516 */
517 static int bounce_error_event(struct snd_seq_client *client,
518 struct snd_seq_event *event,
519 int err, int atomic, int hop)
520 {
521 struct snd_seq_event bounce_ev;
522 int result;
523
524 if (client == NULL ||
525 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
526 ! client->accept_input)
527 return 0; /* ignored */
528
529 /* set up quoted error */
530 memset(&bounce_ev, 0, sizeof(bounce_ev));
531 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
532 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
533 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
534 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
535 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
536 bounce_ev.dest.client = client->number;
537 bounce_ev.dest.port = event->source.port;
538 bounce_ev.data.quote.origin = event->dest;
539 bounce_ev.data.quote.event = event;
540 bounce_ev.data.quote.value = -err; /* use positive value */
541 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
542 if (result < 0) {
543 client->event_lost++;
544 return result;
545 }
546
547 return result;
548 }
549
550
551 /*
552 * rewrite the time-stamp of the event record with the curren time
553 * of the given queue.
554 * return non-zero if updated.
555 */
556 static int update_timestamp_of_queue(struct snd_seq_event *event,
557 int queue, int real_time)
558 {
559 struct snd_seq_queue *q;
560
561 q = queueptr(queue);
562 if (! q)
563 return 0;
564 event->queue = queue;
565 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
566 if (real_time) {
567 event->time.time = snd_seq_timer_get_cur_time(q->timer);
568 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
569 } else {
570 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
571 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
572 }
573 queuefree(q);
574 return 1;
575 }
576
577
578 /*
579 * deliver an event to the specified destination.
580 * if filter is non-zero, client filter bitmap is tested.
581 *
582 * RETURN VALUE: 0 : if succeeded
583 * <0 : error
584 */
585 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
586 struct snd_seq_event *event,
587 int filter, int atomic, int hop)
588 {
589 struct snd_seq_client *dest = NULL;
590 struct snd_seq_client_port *dest_port = NULL;
591 int result = -ENOENT;
592 int direct;
593
594 direct = snd_seq_ev_is_direct(event);
595
596 dest = get_event_dest_client(event, filter);
597 if (dest == NULL)
598 goto __skip;
599 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
600 if (dest_port == NULL)
601 goto __skip;
602
603 /* check permission */
604 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
605 result = -EPERM;
606 goto __skip;
607 }
608
609 if (dest_port->timestamping)
610 update_timestamp_of_queue(event, dest_port->time_queue,
611 dest_port->time_real);
612
613 switch (dest->type) {
614 case USER_CLIENT:
615 if (dest->data.user.fifo)
616 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
617 break;
618
619 case KERNEL_CLIENT:
620 if (dest_port->event_input == NULL)
621 break;
622 result = dest_port->event_input(event, direct,
623 dest_port->private_data,
624 atomic, hop);
625 break;
626 default:
627 break;
628 }
629
630 __skip:
631 if (dest_port)
632 snd_seq_port_unlock(dest_port);
633 if (dest)
634 snd_seq_client_unlock(dest);
635
636 if (result < 0 && !direct) {
637 result = bounce_error_event(client, event, result, atomic, hop);
638 }
639 return result;
640 }
641
642
643 /*
644 * send the event to all subscribers:
645 */
646 static int deliver_to_subscribers(struct snd_seq_client *client,
647 struct snd_seq_event *event,
648 int atomic, int hop)
649 {
650 struct snd_seq_subscribers *subs;
651 int err, result = 0, num_ev = 0;
652 struct snd_seq_event event_saved;
653 struct snd_seq_client_port *src_port;
654 struct snd_seq_port_subs_info *grp;
655
656 src_port = snd_seq_port_use_ptr(client, event->source.port);
657 if (src_port == NULL)
658 return -EINVAL; /* invalid source port */
659 /* save original event record */
660 event_saved = *event;
661 grp = &src_port->c_src;
662
663 /* lock list */
664 if (atomic)
665 read_lock(&grp->list_lock);
666 else
667 down_read_nested(&grp->list_mutex, hop);
668 list_for_each_entry(subs, &grp->list_head, src_list) {
669 /* both ports ready? */
670 if (atomic_read(&subs->ref_count) != 2)
671 continue;
672 event->dest = subs->info.dest;
673 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
674 /* convert time according to flag with subscription */
675 update_timestamp_of_queue(event, subs->info.queue,
676 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
677 err = snd_seq_deliver_single_event(client, event,
678 0, atomic, hop);
679 if (err < 0) {
680 /* save first error that occurs and continue */
681 if (!result)
682 result = err;
683 continue;
684 }
685 num_ev++;
686 /* restore original event record */
687 *event = event_saved;
688 }
689 if (atomic)
690 read_unlock(&grp->list_lock);
691 else
692 up_read(&grp->list_mutex);
693 *event = event_saved; /* restore */
694 snd_seq_port_unlock(src_port);
695 return (result < 0) ? result : num_ev;
696 }
697
698
699 #ifdef SUPPORT_BROADCAST
700 /*
701 * broadcast to all ports:
702 */
703 static int port_broadcast_event(struct snd_seq_client *client,
704 struct snd_seq_event *event,
705 int atomic, int hop)
706 {
707 int num_ev = 0, err, result = 0;
708 struct snd_seq_client *dest_client;
709 struct snd_seq_client_port *port;
710
711 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
712 if (dest_client == NULL)
713 return 0; /* no matching destination */
714
715 read_lock(&dest_client->ports_lock);
716 list_for_each_entry(port, &dest_client->ports_list_head, list) {
717 event->dest.port = port->addr.port;
718 /* pass NULL as source client to avoid error bounce */
719 err = snd_seq_deliver_single_event(NULL, event,
720 SNDRV_SEQ_FILTER_BROADCAST,
721 atomic, hop);
722 if (err < 0) {
723 /* save first error that occurs and continue */
724 if (!result)
725 result = err;
726 continue;
727 }
728 num_ev++;
729 }
730 read_unlock(&dest_client->ports_lock);
731 snd_seq_client_unlock(dest_client);
732 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
733 return (result < 0) ? result : num_ev;
734 }
735
736 /*
737 * send the event to all clients:
738 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
739 */
740 static int broadcast_event(struct snd_seq_client *client,
741 struct snd_seq_event *event, int atomic, int hop)
742 {
743 int err, result = 0, num_ev = 0;
744 int dest;
745 struct snd_seq_addr addr;
746
747 addr = event->dest; /* save */
748
749 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
750 /* don't send to itself */
751 if (dest == client->number)
752 continue;
753 event->dest.client = dest;
754 event->dest.port = addr.port;
755 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
756 err = port_broadcast_event(client, event, atomic, hop);
757 else
758 /* pass NULL as source client to avoid error bounce */
759 err = snd_seq_deliver_single_event(NULL, event,
760 SNDRV_SEQ_FILTER_BROADCAST,
761 atomic, hop);
762 if (err < 0) {
763 /* save first error that occurs and continue */
764 if (!result)
765 result = err;
766 continue;
767 }
768 num_ev += err;
769 }
770 event->dest = addr; /* restore */
771 return (result < 0) ? result : num_ev;
772 }
773
774
775 /* multicast - not supported yet */
776 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
777 int atomic, int hop)
778 {
779 pr_debug("ALSA: seq: multicast not supported yet.\n");
780 return 0; /* ignored */
781 }
782 #endif /* SUPPORT_BROADCAST */
783
784
785 /* deliver an event to the destination port(s).
786 * if the event is to subscribers or broadcast, the event is dispatched
787 * to multiple targets.
788 *
789 * RETURN VALUE: n > 0 : the number of delivered events.
790 * n == 0 : the event was not passed to any client.
791 * n < 0 : error - event was not processed.
792 */
793 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
794 int atomic, int hop)
795 {
796 int result;
797
798 hop++;
799 if (hop >= SNDRV_SEQ_MAX_HOPS) {
800 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
801 event->source.client, event->source.port,
802 event->dest.client, event->dest.port);
803 return -EMLINK;
804 }
805
806 if (snd_seq_ev_is_variable(event) &&
807 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
808 return -EINVAL;
809
810 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
811 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
812 result = deliver_to_subscribers(client, event, atomic, hop);
813 #ifdef SUPPORT_BROADCAST
814 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
815 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
816 result = broadcast_event(client, event, atomic, hop);
817 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
818 result = multicast_event(client, event, atomic, hop);
819 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
820 result = port_broadcast_event(client, event, atomic, hop);
821 #endif
822 else
823 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
824
825 return result;
826 }
827
828 /*
829 * dispatch an event cell:
830 * This function is called only from queue check routines in timer
831 * interrupts or after enqueued.
832 * The event cell shall be released or re-queued in this function.
833 *
834 * RETURN VALUE: n > 0 : the number of delivered events.
835 * n == 0 : the event was not passed to any client.
836 * n < 0 : error - event was not processed.
837 */
838 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
839 {
840 struct snd_seq_client *client;
841 int result;
842
843 if (snd_BUG_ON(!cell))
844 return -EINVAL;
845
846 client = snd_seq_client_use_ptr(cell->event.source.client);
847 if (client == NULL) {
848 snd_seq_cell_free(cell); /* release this cell */
849 return -EINVAL;
850 }
851
852 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
853 /* NOTE event:
854 * the event cell is re-used as a NOTE-OFF event and
855 * enqueued again.
856 */
857 struct snd_seq_event tmpev, *ev;
858
859 /* reserve this event to enqueue note-off later */
860 tmpev = cell->event;
861 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
862 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
863
864 /*
865 * This was originally a note event. We now re-use the
866 * cell for the note-off event.
867 */
868
869 ev = &cell->event;
870 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
871 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
872
873 /* add the duration time */
874 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
875 case SNDRV_SEQ_TIME_STAMP_TICK:
876 ev->time.tick += ev->data.note.duration;
877 break;
878 case SNDRV_SEQ_TIME_STAMP_REAL:
879 /* unit for duration is ms */
880 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
881 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
882 ev->time.time.tv_nsec / 1000000000;
883 ev->time.time.tv_nsec %= 1000000000;
884 break;
885 }
886 ev->data.note.velocity = ev->data.note.off_velocity;
887
888 /* Now queue this cell as the note off event */
889 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
890 snd_seq_cell_free(cell); /* release this cell */
891
892 } else {
893 /* Normal events:
894 * event cell is freed after processing the event
895 */
896
897 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
898 snd_seq_cell_free(cell);
899 }
900
901 snd_seq_client_unlock(client);
902 return result;
903 }
904
905
906 /* Allocate a cell from client pool and enqueue it to queue:
907 * if pool is empty and blocking is TRUE, sleep until a new cell is
908 * available.
909 */
910 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
911 struct snd_seq_event *event,
912 struct file *file, int blocking,
913 int atomic, int hop,
914 struct mutex *mutexp)
915 {
916 struct snd_seq_event_cell *cell;
917 int err;
918
919 /* special queue values - force direct passing */
920 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
921 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
922 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
923 } else
924 #ifdef SUPPORT_BROADCAST
925 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
926 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
927 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
928 }
929 #endif
930 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
931 /* check presence of source port */
932 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
933 if (src_port == NULL)
934 return -EINVAL;
935 snd_seq_port_unlock(src_port);
936 }
937
938 /* direct event processing without enqueued */
939 if (snd_seq_ev_is_direct(event)) {
940 if (event->type == SNDRV_SEQ_EVENT_NOTE)
941 return -EINVAL; /* this event must be enqueued! */
942 return snd_seq_deliver_event(client, event, atomic, hop);
943 }
944
945 /* Not direct, normal queuing */
946 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
947 return -EINVAL; /* invalid queue */
948 if (! snd_seq_write_pool_allocated(client))
949 return -ENXIO; /* queue is not allocated */
950
951 /* allocate an event cell */
952 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
953 file, mutexp);
954 if (err < 0)
955 return err;
956
957 /* we got a cell. enqueue it. */
958 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
959 snd_seq_cell_free(cell);
960 return err;
961 }
962
963 return 0;
964 }
965
966
967 /*
968 * check validity of event type and data length.
969 * return non-zero if invalid.
970 */
971 static int check_event_type_and_length(struct snd_seq_event *ev)
972 {
973 switch (snd_seq_ev_length_type(ev)) {
974 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
975 if (snd_seq_ev_is_variable_type(ev))
976 return -EINVAL;
977 break;
978 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
979 if (! snd_seq_ev_is_variable_type(ev) ||
980 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
981 return -EINVAL;
982 break;
983 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
984 if (! snd_seq_ev_is_direct(ev))
985 return -EINVAL;
986 break;
987 }
988 return 0;
989 }
990
991
992 /* handle write() */
993 /* possible error values:
994 * -ENXIO invalid client or file open mode
995 * -ENOMEM malloc failed
996 * -EFAULT seg. fault during copy from user space
997 * -EINVAL invalid event
998 * -EAGAIN no space in output pool
999 * -EINTR interrupts while sleep
1000 * -EMLINK too many hops
1001 * others depends on return value from driver callback
1002 */
1003 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1004 size_t count, loff_t *offset)
1005 {
1006 struct snd_seq_client *client = file->private_data;
1007 int written = 0, len;
1008 int err;
1009 struct snd_seq_event event;
1010
1011 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1012 return -ENXIO;
1013
1014 /* check client structures are in place */
1015 if (snd_BUG_ON(!client))
1016 return -ENXIO;
1017
1018 if (!client->accept_output || client->pool == NULL)
1019 return -ENXIO;
1020
1021 /* allocate the pool now if the pool is not allocated yet */
1022 mutex_lock(&client->ioctl_mutex);
1023 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1024 err = snd_seq_pool_init(client->pool);
1025 if (err < 0)
1026 goto out;
1027 }
1028
1029 /* only process whole events */
1030 err = -EINVAL;
1031 while (count >= sizeof(struct snd_seq_event)) {
1032 /* Read in the event header from the user */
1033 len = sizeof(event);
1034 if (copy_from_user(&event, buf, len)) {
1035 err = -EFAULT;
1036 break;
1037 }
1038 event.source.client = client->number; /* fill in client number */
1039 /* Check for extension data length */
1040 if (check_event_type_and_length(&event)) {
1041 err = -EINVAL;
1042 break;
1043 }
1044
1045 /* check for special events */
1046 if (event.type == SNDRV_SEQ_EVENT_NONE)
1047 goto __skip_event;
1048 else if (snd_seq_ev_is_reserved(&event)) {
1049 err = -EINVAL;
1050 break;
1051 }
1052
1053 if (snd_seq_ev_is_variable(&event)) {
1054 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1055 if ((size_t)(extlen + len) > count) {
1056 /* back out, will get an error this time or next */
1057 err = -EINVAL;
1058 break;
1059 }
1060 /* set user space pointer */
1061 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1062 event.data.ext.ptr = (char __force *)buf
1063 + sizeof(struct snd_seq_event);
1064 len += extlen; /* increment data length */
1065 } else {
1066 #ifdef CONFIG_COMPAT
1067 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1068 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1069 event.data.ext.ptr = ptr;
1070 }
1071 #endif
1072 }
1073
1074 /* ok, enqueue it */
1075 err = snd_seq_client_enqueue_event(client, &event, file,
1076 !(file->f_flags & O_NONBLOCK),
1077 0, 0, &client->ioctl_mutex);
1078 if (err < 0)
1079 break;
1080
1081 __skip_event:
1082 /* Update pointers and counts */
1083 count -= len;
1084 buf += len;
1085 written += len;
1086 }
1087
1088 out:
1089 mutex_unlock(&client->ioctl_mutex);
1090 return written ? written : err;
1091 }
1092
1093
1094 /*
1095 * handle polling
1096 */
1097 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1098 {
1099 struct snd_seq_client *client = file->private_data;
1100 __poll_t mask = 0;
1101
1102 /* check client structures are in place */
1103 if (snd_BUG_ON(!client))
1104 return -ENXIO;
1105
1106 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1107 client->data.user.fifo) {
1108
1109 /* check if data is available in the outqueue */
1110 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1111 mask |= EPOLLIN | EPOLLRDNORM;
1112 }
1113
1114 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1115
1116 /* check if data is available in the pool */
1117 if (!snd_seq_write_pool_allocated(client) ||
1118 snd_seq_pool_poll_wait(client->pool, file, wait))
1119 mask |= EPOLLOUT | EPOLLWRNORM;
1120 }
1121
1122 return mask;
1123 }
1124
1125
1126 /*-----------------------------------------------------*/
1127
1128 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1129 {
1130 int *pversion = arg;
1131
1132 *pversion = SNDRV_SEQ_VERSION;
1133 return 0;
1134 }
1135
1136 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1137 {
1138 int *client_id = arg;
1139
1140 *client_id = client->number;
1141 return 0;
1142 }
1143
1144 /* SYSTEM_INFO ioctl() */
1145 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1146 {
1147 struct snd_seq_system_info *info = arg;
1148
1149 memset(info, 0, sizeof(*info));
1150 /* fill the info fields */
1151 info->queues = SNDRV_SEQ_MAX_QUEUES;
1152 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1153 info->ports = SNDRV_SEQ_MAX_PORTS;
1154 info->channels = 256; /* fixed limit */
1155 info->cur_clients = client_usage.cur;
1156 info->cur_queues = snd_seq_queue_get_cur_queues();
1157
1158 return 0;
1159 }
1160
1161
1162 /* RUNNING_MODE ioctl() */
1163 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1164 {
1165 struct snd_seq_running_info *info = arg;
1166 struct snd_seq_client *cptr;
1167 int err = 0;
1168
1169 /* requested client number */
1170 cptr = snd_seq_client_use_ptr(info->client);
1171 if (cptr == NULL)
1172 return -ENOENT; /* don't change !!! */
1173
1174 #ifdef SNDRV_BIG_ENDIAN
1175 if (!info->big_endian) {
1176 err = -EINVAL;
1177 goto __err;
1178 }
1179 #else
1180 if (info->big_endian) {
1181 err = -EINVAL;
1182 goto __err;
1183 }
1184
1185 #endif
1186 if (info->cpu_mode > sizeof(long)) {
1187 err = -EINVAL;
1188 goto __err;
1189 }
1190 cptr->convert32 = (info->cpu_mode < sizeof(long));
1191 __err:
1192 snd_seq_client_unlock(cptr);
1193 return err;
1194 }
1195
1196 /* CLIENT_INFO ioctl() */
1197 static void get_client_info(struct snd_seq_client *cptr,
1198 struct snd_seq_client_info *info)
1199 {
1200 info->client = cptr->number;
1201
1202 /* fill the info fields */
1203 info->type = cptr->type;
1204 strcpy(info->name, cptr->name);
1205 info->filter = cptr->filter;
1206 info->event_lost = cptr->event_lost;
1207 memcpy(info->event_filter, cptr->event_filter, 32);
1208 info->num_ports = cptr->num_ports;
1209
1210 if (cptr->type == USER_CLIENT)
1211 info->pid = pid_vnr(cptr->data.user.owner);
1212 else
1213 info->pid = -1;
1214
1215 if (cptr->type == KERNEL_CLIENT)
1216 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1217 else
1218 info->card = -1;
1219
1220 memset(info->reserved, 0, sizeof(info->reserved));
1221 }
1222
1223 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1224 void *arg)
1225 {
1226 struct snd_seq_client_info *client_info = arg;
1227 struct snd_seq_client *cptr;
1228
1229 /* requested client number */
1230 cptr = snd_seq_client_use_ptr(client_info->client);
1231 if (cptr == NULL)
1232 return -ENOENT; /* don't change !!! */
1233
1234 get_client_info(cptr, client_info);
1235 snd_seq_client_unlock(cptr);
1236
1237 return 0;
1238 }
1239
1240
1241 /* CLIENT_INFO ioctl() */
1242 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1243 void *arg)
1244 {
1245 struct snd_seq_client_info *client_info = arg;
1246
1247 /* it is not allowed to set the info fields for an another client */
1248 if (client->number != client_info->client)
1249 return -EPERM;
1250 /* also client type must be set now */
1251 if (client->type != client_info->type)
1252 return -EINVAL;
1253
1254 /* fill the info fields */
1255 if (client_info->name[0])
1256 strlcpy(client->name, client_info->name, sizeof(client->name));
1257
1258 client->filter = client_info->filter;
1259 client->event_lost = client_info->event_lost;
1260 memcpy(client->event_filter, client_info->event_filter, 32);
1261
1262 return 0;
1263 }
1264
1265
1266 /*
1267 * CREATE PORT ioctl()
1268 */
1269 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1270 {
1271 struct snd_seq_port_info *info = arg;
1272 struct snd_seq_client_port *port;
1273 struct snd_seq_port_callback *callback;
1274 int port_idx;
1275
1276 /* it is not allowed to create the port for an another client */
1277 if (info->addr.client != client->number)
1278 return -EPERM;
1279
1280 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1281 if (port == NULL)
1282 return -ENOMEM;
1283
1284 if (client->type == USER_CLIENT && info->kernel) {
1285 port_idx = port->addr.port;
1286 snd_seq_port_unlock(port);
1287 snd_seq_delete_port(client, port_idx);
1288 return -EINVAL;
1289 }
1290 if (client->type == KERNEL_CLIENT) {
1291 if ((callback = info->kernel) != NULL) {
1292 if (callback->owner)
1293 port->owner = callback->owner;
1294 port->private_data = callback->private_data;
1295 port->private_free = callback->private_free;
1296 port->event_input = callback->event_input;
1297 port->c_src.open = callback->subscribe;
1298 port->c_src.close = callback->unsubscribe;
1299 port->c_dest.open = callback->use;
1300 port->c_dest.close = callback->unuse;
1301 }
1302 }
1303
1304 info->addr = port->addr;
1305
1306 snd_seq_set_port_info(port, info);
1307 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1308 snd_seq_port_unlock(port);
1309
1310 return 0;
1311 }
1312
1313 /*
1314 * DELETE PORT ioctl()
1315 */
1316 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1317 {
1318 struct snd_seq_port_info *info = arg;
1319 int err;
1320
1321 /* it is not allowed to remove the port for an another client */
1322 if (info->addr.client != client->number)
1323 return -EPERM;
1324
1325 err = snd_seq_delete_port(client, info->addr.port);
1326 if (err >= 0)
1327 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1328 return err;
1329 }
1330
1331
1332 /*
1333 * GET_PORT_INFO ioctl() (on any client)
1334 */
1335 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1336 {
1337 struct snd_seq_port_info *info = arg;
1338 struct snd_seq_client *cptr;
1339 struct snd_seq_client_port *port;
1340
1341 cptr = snd_seq_client_use_ptr(info->addr.client);
1342 if (cptr == NULL)
1343 return -ENXIO;
1344
1345 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1346 if (port == NULL) {
1347 snd_seq_client_unlock(cptr);
1348 return -ENOENT; /* don't change */
1349 }
1350
1351 /* get port info */
1352 snd_seq_get_port_info(port, info);
1353 snd_seq_port_unlock(port);
1354 snd_seq_client_unlock(cptr);
1355
1356 return 0;
1357 }
1358
1359
1360 /*
1361 * SET_PORT_INFO ioctl() (only ports on this/own client)
1362 */
1363 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1364 {
1365 struct snd_seq_port_info *info = arg;
1366 struct snd_seq_client_port *port;
1367
1368 if (info->addr.client != client->number) /* only set our own ports ! */
1369 return -EPERM;
1370 port = snd_seq_port_use_ptr(client, info->addr.port);
1371 if (port) {
1372 snd_seq_set_port_info(port, info);
1373 snd_seq_port_unlock(port);
1374 }
1375 return 0;
1376 }
1377
1378
1379 /*
1380 * port subscription (connection)
1381 */
1382 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1383 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1384
1385 static int check_subscription_permission(struct snd_seq_client *client,
1386 struct snd_seq_client_port *sport,
1387 struct snd_seq_client_port *dport,
1388 struct snd_seq_port_subscribe *subs)
1389 {
1390 if (client->number != subs->sender.client &&
1391 client->number != subs->dest.client) {
1392 /* connection by third client - check export permission */
1393 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1394 return -EPERM;
1395 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1396 return -EPERM;
1397 }
1398
1399 /* check read permission */
1400 /* if sender or receiver is the subscribing client itself,
1401 * no permission check is necessary
1402 */
1403 if (client->number != subs->sender.client) {
1404 if (! check_port_perm(sport, PERM_RD))
1405 return -EPERM;
1406 }
1407 /* check write permission */
1408 if (client->number != subs->dest.client) {
1409 if (! check_port_perm(dport, PERM_WR))
1410 return -EPERM;
1411 }
1412 return 0;
1413 }
1414
1415 /*
1416 * send an subscription notify event to user client:
1417 * client must be user client.
1418 */
1419 int snd_seq_client_notify_subscription(int client, int port,
1420 struct snd_seq_port_subscribe *info,
1421 int evtype)
1422 {
1423 struct snd_seq_event event;
1424
1425 memset(&event, 0, sizeof(event));
1426 event.type = evtype;
1427 event.data.connect.dest = info->dest;
1428 event.data.connect.sender = info->sender;
1429
1430 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1431 }
1432
1433
1434 /*
1435 * add to port's subscription list IOCTL interface
1436 */
1437 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1438 void *arg)
1439 {
1440 struct snd_seq_port_subscribe *subs = arg;
1441 int result = -EINVAL;
1442 struct snd_seq_client *receiver = NULL, *sender = NULL;
1443 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1444
1445 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1446 goto __end;
1447 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1448 goto __end;
1449 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1450 goto __end;
1451 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1452 goto __end;
1453
1454 result = check_subscription_permission(client, sport, dport, subs);
1455 if (result < 0)
1456 goto __end;
1457
1458 /* connect them */
1459 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1460 if (! result) /* broadcast announce */
1461 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1462 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1463 __end:
1464 if (sport)
1465 snd_seq_port_unlock(sport);
1466 if (dport)
1467 snd_seq_port_unlock(dport);
1468 if (sender)
1469 snd_seq_client_unlock(sender);
1470 if (receiver)
1471 snd_seq_client_unlock(receiver);
1472 return result;
1473 }
1474
1475
1476 /*
1477 * remove from port's subscription list
1478 */
1479 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1480 void *arg)
1481 {
1482 struct snd_seq_port_subscribe *subs = arg;
1483 int result = -ENXIO;
1484 struct snd_seq_client *receiver = NULL, *sender = NULL;
1485 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1486
1487 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1488 goto __end;
1489 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1490 goto __end;
1491 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1492 goto __end;
1493 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1494 goto __end;
1495
1496 result = check_subscription_permission(client, sport, dport, subs);
1497 if (result < 0)
1498 goto __end;
1499
1500 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1501 if (! result) /* broadcast announce */
1502 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1503 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1504 __end:
1505 if (sport)
1506 snd_seq_port_unlock(sport);
1507 if (dport)
1508 snd_seq_port_unlock(dport);
1509 if (sender)
1510 snd_seq_client_unlock(sender);
1511 if (receiver)
1512 snd_seq_client_unlock(receiver);
1513 return result;
1514 }
1515
1516
1517 /* CREATE_QUEUE ioctl() */
1518 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1519 {
1520 struct snd_seq_queue_info *info = arg;
1521 struct snd_seq_queue *q;
1522
1523 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1524 if (IS_ERR(q))
1525 return PTR_ERR(q);
1526
1527 info->queue = q->queue;
1528 info->locked = q->locked;
1529 info->owner = q->owner;
1530
1531 /* set queue name */
1532 if (!info->name[0])
1533 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1534 strlcpy(q->name, info->name, sizeof(q->name));
1535 snd_use_lock_free(&q->use_lock);
1536
1537 return 0;
1538 }
1539
1540 /* DELETE_QUEUE ioctl() */
1541 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1542 {
1543 struct snd_seq_queue_info *info = arg;
1544
1545 return snd_seq_queue_delete(client->number, info->queue);
1546 }
1547
1548 /* GET_QUEUE_INFO ioctl() */
1549 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1550 void *arg)
1551 {
1552 struct snd_seq_queue_info *info = arg;
1553 struct snd_seq_queue *q;
1554
1555 q = queueptr(info->queue);
1556 if (q == NULL)
1557 return -EINVAL;
1558
1559 memset(info, 0, sizeof(*info));
1560 info->queue = q->queue;
1561 info->owner = q->owner;
1562 info->locked = q->locked;
1563 strlcpy(info->name, q->name, sizeof(info->name));
1564 queuefree(q);
1565
1566 return 0;
1567 }
1568
1569 /* SET_QUEUE_INFO ioctl() */
1570 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1571 void *arg)
1572 {
1573 struct snd_seq_queue_info *info = arg;
1574 struct snd_seq_queue *q;
1575
1576 if (info->owner != client->number)
1577 return -EINVAL;
1578
1579 /* change owner/locked permission */
1580 if (snd_seq_queue_check_access(info->queue, client->number)) {
1581 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1582 return -EPERM;
1583 if (info->locked)
1584 snd_seq_queue_use(info->queue, client->number, 1);
1585 } else {
1586 return -EPERM;
1587 }
1588
1589 q = queueptr(info->queue);
1590 if (! q)
1591 return -EINVAL;
1592 if (q->owner != client->number) {
1593 queuefree(q);
1594 return -EPERM;
1595 }
1596 strlcpy(q->name, info->name, sizeof(q->name));
1597 queuefree(q);
1598
1599 return 0;
1600 }
1601
1602 /* GET_NAMED_QUEUE ioctl() */
1603 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1604 void *arg)
1605 {
1606 struct snd_seq_queue_info *info = arg;
1607 struct snd_seq_queue *q;
1608
1609 q = snd_seq_queue_find_name(info->name);
1610 if (q == NULL)
1611 return -EINVAL;
1612 info->queue = q->queue;
1613 info->owner = q->owner;
1614 info->locked = q->locked;
1615 queuefree(q);
1616
1617 return 0;
1618 }
1619
1620 /* GET_QUEUE_STATUS ioctl() */
1621 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1622 void *arg)
1623 {
1624 struct snd_seq_queue_status *status = arg;
1625 struct snd_seq_queue *queue;
1626 struct snd_seq_timer *tmr;
1627
1628 queue = queueptr(status->queue);
1629 if (queue == NULL)
1630 return -EINVAL;
1631 memset(status, 0, sizeof(*status));
1632 status->queue = queue->queue;
1633
1634 tmr = queue->timer;
1635 status->events = queue->tickq->cells + queue->timeq->cells;
1636
1637 status->time = snd_seq_timer_get_cur_time(tmr);
1638 status->tick = snd_seq_timer_get_cur_tick(tmr);
1639
1640 status->running = tmr->running;
1641
1642 status->flags = queue->flags;
1643 queuefree(queue);
1644
1645 return 0;
1646 }
1647
1648
1649 /* GET_QUEUE_TEMPO ioctl() */
1650 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1651 void *arg)
1652 {
1653 struct snd_seq_queue_tempo *tempo = arg;
1654 struct snd_seq_queue *queue;
1655 struct snd_seq_timer *tmr;
1656
1657 queue = queueptr(tempo->queue);
1658 if (queue == NULL)
1659 return -EINVAL;
1660 memset(tempo, 0, sizeof(*tempo));
1661 tempo->queue = queue->queue;
1662
1663 tmr = queue->timer;
1664
1665 tempo->tempo = tmr->tempo;
1666 tempo->ppq = tmr->ppq;
1667 tempo->skew_value = tmr->skew;
1668 tempo->skew_base = tmr->skew_base;
1669 queuefree(queue);
1670
1671 return 0;
1672 }
1673
1674
1675 /* SET_QUEUE_TEMPO ioctl() */
1676 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1677 {
1678 if (!snd_seq_queue_check_access(tempo->queue, client))
1679 return -EPERM;
1680 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1681 }
1682 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1683
1684 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1685 void *arg)
1686 {
1687 struct snd_seq_queue_tempo *tempo = arg;
1688 int result;
1689
1690 result = snd_seq_set_queue_tempo(client->number, tempo);
1691 return result < 0 ? result : 0;
1692 }
1693
1694
1695 /* GET_QUEUE_TIMER ioctl() */
1696 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1697 void *arg)
1698 {
1699 struct snd_seq_queue_timer *timer = arg;
1700 struct snd_seq_queue *queue;
1701 struct snd_seq_timer *tmr;
1702
1703 queue = queueptr(timer->queue);
1704 if (queue == NULL)
1705 return -EINVAL;
1706
1707 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1708 queuefree(queue);
1709 return -ERESTARTSYS;
1710 }
1711 tmr = queue->timer;
1712 memset(timer, 0, sizeof(*timer));
1713 timer->queue = queue->queue;
1714
1715 timer->type = tmr->type;
1716 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1717 timer->u.alsa.id = tmr->alsa_id;
1718 timer->u.alsa.resolution = tmr->preferred_resolution;
1719 }
1720 mutex_unlock(&queue->timer_mutex);
1721 queuefree(queue);
1722
1723 return 0;
1724 }
1725
1726
1727 /* SET_QUEUE_TIMER ioctl() */
1728 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1729 void *arg)
1730 {
1731 struct snd_seq_queue_timer *timer = arg;
1732 int result = 0;
1733
1734 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1735 return -EINVAL;
1736
1737 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1738 struct snd_seq_queue *q;
1739 struct snd_seq_timer *tmr;
1740
1741 q = queueptr(timer->queue);
1742 if (q == NULL)
1743 return -ENXIO;
1744 if (mutex_lock_interruptible(&q->timer_mutex)) {
1745 queuefree(q);
1746 return -ERESTARTSYS;
1747 }
1748 tmr = q->timer;
1749 snd_seq_queue_timer_close(timer->queue);
1750 tmr->type = timer->type;
1751 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1752 tmr->alsa_id = timer->u.alsa.id;
1753 tmr->preferred_resolution = timer->u.alsa.resolution;
1754 }
1755 result = snd_seq_queue_timer_open(timer->queue);
1756 mutex_unlock(&q->timer_mutex);
1757 queuefree(q);
1758 } else {
1759 return -EPERM;
1760 }
1761
1762 return result;
1763 }
1764
1765
1766 /* GET_QUEUE_CLIENT ioctl() */
1767 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1768 void *arg)
1769 {
1770 struct snd_seq_queue_client *info = arg;
1771 int used;
1772
1773 used = snd_seq_queue_is_used(info->queue, client->number);
1774 if (used < 0)
1775 return -EINVAL;
1776 info->used = used;
1777 info->client = client->number;
1778
1779 return 0;
1780 }
1781
1782
1783 /* SET_QUEUE_CLIENT ioctl() */
1784 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1785 void *arg)
1786 {
1787 struct snd_seq_queue_client *info = arg;
1788 int err;
1789
1790 if (info->used >= 0) {
1791 err = snd_seq_queue_use(info->queue, client->number, info->used);
1792 if (err < 0)
1793 return err;
1794 }
1795
1796 return snd_seq_ioctl_get_queue_client(client, arg);
1797 }
1798
1799
1800 /* GET_CLIENT_POOL ioctl() */
1801 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1802 void *arg)
1803 {
1804 struct snd_seq_client_pool *info = arg;
1805 struct snd_seq_client *cptr;
1806
1807 cptr = snd_seq_client_use_ptr(info->client);
1808 if (cptr == NULL)
1809 return -ENOENT;
1810 memset(info, 0, sizeof(*info));
1811 info->client = cptr->number;
1812 info->output_pool = cptr->pool->size;
1813 info->output_room = cptr->pool->room;
1814 info->output_free = info->output_pool;
1815 info->output_free = snd_seq_unused_cells(cptr->pool);
1816 if (cptr->type == USER_CLIENT) {
1817 info->input_pool = cptr->data.user.fifo_pool_size;
1818 info->input_free = info->input_pool;
1819 if (cptr->data.user.fifo)
1820 info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1821 } else {
1822 info->input_pool = 0;
1823 info->input_free = 0;
1824 }
1825 snd_seq_client_unlock(cptr);
1826
1827 return 0;
1828 }
1829
1830 /* SET_CLIENT_POOL ioctl() */
1831 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1832 void *arg)
1833 {
1834 struct snd_seq_client_pool *info = arg;
1835 int rc;
1836
1837 if (client->number != info->client)
1838 return -EINVAL; /* can't change other clients */
1839
1840 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1841 (! snd_seq_write_pool_allocated(client) ||
1842 info->output_pool != client->pool->size)) {
1843 if (snd_seq_write_pool_allocated(client)) {
1844 /* is the pool in use? */
1845 if (atomic_read(&client->pool->counter))
1846 return -EBUSY;
1847 /* remove all existing cells */
1848 snd_seq_pool_mark_closing(client->pool);
1849 snd_seq_pool_done(client->pool);
1850 }
1851 client->pool->size = info->output_pool;
1852 rc = snd_seq_pool_init(client->pool);
1853 if (rc < 0)
1854 return rc;
1855 }
1856 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1857 info->input_pool >= 1 &&
1858 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1859 info->input_pool != client->data.user.fifo_pool_size) {
1860 /* change pool size */
1861 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1862 if (rc < 0)
1863 return rc;
1864 client->data.user.fifo_pool_size = info->input_pool;
1865 }
1866 if (info->output_room >= 1 &&
1867 info->output_room <= client->pool->size) {
1868 client->pool->room = info->output_room;
1869 }
1870
1871 return snd_seq_ioctl_get_client_pool(client, arg);
1872 }
1873
1874
1875 /* REMOVE_EVENTS ioctl() */
1876 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1877 void *arg)
1878 {
1879 struct snd_seq_remove_events *info = arg;
1880
1881 /*
1882 * Input mostly not implemented XXX.
1883 */
1884 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1885 /*
1886 * No restrictions so for a user client we can clear
1887 * the whole fifo
1888 */
1889 if (client->type == USER_CLIENT && client->data.user.fifo)
1890 snd_seq_fifo_clear(client->data.user.fifo);
1891 }
1892
1893 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1894 snd_seq_queue_remove_cells(client->number, info);
1895
1896 return 0;
1897 }
1898
1899
1900 /*
1901 * get subscription info
1902 */
1903 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1904 void *arg)
1905 {
1906 struct snd_seq_port_subscribe *subs = arg;
1907 int result;
1908 struct snd_seq_client *sender = NULL;
1909 struct snd_seq_client_port *sport = NULL;
1910 struct snd_seq_subscribers *p;
1911
1912 result = -EINVAL;
1913 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1914 goto __end;
1915 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1916 goto __end;
1917 p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1918 if (p) {
1919 result = 0;
1920 *subs = p->info;
1921 } else
1922 result = -ENOENT;
1923
1924 __end:
1925 if (sport)
1926 snd_seq_port_unlock(sport);
1927 if (sender)
1928 snd_seq_client_unlock(sender);
1929
1930 return result;
1931 }
1932
1933
1934 /*
1935 * get subscription info - check only its presence
1936 */
1937 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1938 {
1939 struct snd_seq_query_subs *subs = arg;
1940 int result = -ENXIO;
1941 struct snd_seq_client *cptr = NULL;
1942 struct snd_seq_client_port *port = NULL;
1943 struct snd_seq_port_subs_info *group;
1944 struct list_head *p;
1945 int i;
1946
1947 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1948 goto __end;
1949 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1950 goto __end;
1951
1952 switch (subs->type) {
1953 case SNDRV_SEQ_QUERY_SUBS_READ:
1954 group = &port->c_src;
1955 break;
1956 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1957 group = &port->c_dest;
1958 break;
1959 default:
1960 goto __end;
1961 }
1962
1963 down_read(&group->list_mutex);
1964 /* search for the subscriber */
1965 subs->num_subs = group->count;
1966 i = 0;
1967 result = -ENOENT;
1968 list_for_each(p, &group->list_head) {
1969 if (i++ == subs->index) {
1970 /* found! */
1971 struct snd_seq_subscribers *s;
1972 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1973 s = list_entry(p, struct snd_seq_subscribers, src_list);
1974 subs->addr = s->info.dest;
1975 } else {
1976 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1977 subs->addr = s->info.sender;
1978 }
1979 subs->flags = s->info.flags;
1980 subs->queue = s->info.queue;
1981 result = 0;
1982 break;
1983 }
1984 }
1985 up_read(&group->list_mutex);
1986
1987 __end:
1988 if (port)
1989 snd_seq_port_unlock(port);
1990 if (cptr)
1991 snd_seq_client_unlock(cptr);
1992
1993 return result;
1994 }
1995
1996
1997 /*
1998 * query next client
1999 */
2000 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2001 void *arg)
2002 {
2003 struct snd_seq_client_info *info = arg;
2004 struct snd_seq_client *cptr = NULL;
2005
2006 /* search for next client */
2007 info->client++;
2008 if (info->client < 0)
2009 info->client = 0;
2010 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2011 cptr = snd_seq_client_use_ptr(info->client);
2012 if (cptr)
2013 break; /* found */
2014 }
2015 if (cptr == NULL)
2016 return -ENOENT;
2017
2018 get_client_info(cptr, info);
2019 snd_seq_client_unlock(cptr);
2020
2021 return 0;
2022 }
2023
2024 /*
2025 * query next port
2026 */
2027 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2028 void *arg)
2029 {
2030 struct snd_seq_port_info *info = arg;
2031 struct snd_seq_client *cptr;
2032 struct snd_seq_client_port *port = NULL;
2033
2034 cptr = snd_seq_client_use_ptr(info->addr.client);
2035 if (cptr == NULL)
2036 return -ENXIO;
2037
2038 /* search for next port */
2039 info->addr.port++;
2040 port = snd_seq_port_query_nearest(cptr, info);
2041 if (port == NULL) {
2042 snd_seq_client_unlock(cptr);
2043 return -ENOENT;
2044 }
2045
2046 /* get port info */
2047 info->addr = port->addr;
2048 snd_seq_get_port_info(port, info);
2049 snd_seq_port_unlock(port);
2050 snd_seq_client_unlock(cptr);
2051
2052 return 0;
2053 }
2054
2055 /* -------------------------------------------------------- */
2056
2057 static const struct ioctl_handler {
2058 unsigned int cmd;
2059 int (*func)(struct snd_seq_client *client, void *arg);
2060 } ioctl_handlers[] = {
2061 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2062 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2063 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2064 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2065 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2066 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2067 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2068 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2069 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2070 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2071 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2072 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2073 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2074 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2075 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2076 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2077 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2078 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2079 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2080 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2081 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2082 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2083 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2084 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2085 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2086 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2087 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2088 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2089 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2090 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2091 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2092 { 0, NULL },
2093 };
2094
2095 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2096 unsigned long arg)
2097 {
2098 struct snd_seq_client *client = file->private_data;
2099 /* To use kernel stack for ioctl data. */
2100 union {
2101 int pversion;
2102 int client_id;
2103 struct snd_seq_system_info system_info;
2104 struct snd_seq_running_info running_info;
2105 struct snd_seq_client_info client_info;
2106 struct snd_seq_port_info port_info;
2107 struct snd_seq_port_subscribe port_subscribe;
2108 struct snd_seq_queue_info queue_info;
2109 struct snd_seq_queue_status queue_status;
2110 struct snd_seq_queue_tempo tempo;
2111 struct snd_seq_queue_timer queue_timer;
2112 struct snd_seq_queue_client queue_client;
2113 struct snd_seq_client_pool client_pool;
2114 struct snd_seq_remove_events remove_events;
2115 struct snd_seq_query_subs query_subs;
2116 } buf;
2117 const struct ioctl_handler *handler;
2118 unsigned long size;
2119 int err;
2120
2121 if (snd_BUG_ON(!client))
2122 return -ENXIO;
2123
2124 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2125 if (handler->cmd == cmd)
2126 break;
2127 }
2128 if (handler->cmd == 0)
2129 return -ENOTTY;
2130
2131 memset(&buf, 0, sizeof(buf));
2132
2133 /*
2134 * All of ioctl commands for ALSA sequencer get an argument of size
2135 * within 13 bits. We can safely pick up the size from the command.
2136 */
2137 size = _IOC_SIZE(handler->cmd);
2138 if (handler->cmd & IOC_IN) {
2139 if (copy_from_user(&buf, (const void __user *)arg, size))
2140 return -EFAULT;
2141 }
2142
2143 mutex_lock(&client->ioctl_mutex);
2144 err = handler->func(client, &buf);
2145 mutex_unlock(&client->ioctl_mutex);
2146 if (err >= 0) {
2147 /* Some commands includes a bug in 'dir' field. */
2148 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2149 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2150 (handler->cmd & IOC_OUT))
2151 if (copy_to_user((void __user *)arg, &buf, size))
2152 return -EFAULT;
2153 }
2154
2155 return err;
2156 }
2157
2158 #ifdef CONFIG_COMPAT
2159 #include "seq_compat.c"
2160 #else
2161 #define snd_seq_ioctl_compat NULL
2162 #endif
2163
2164 /* -------------------------------------------------------- */
2165
2166
2167 /* exported to kernel modules */
2168 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2169 const char *name_fmt, ...)
2170 {
2171 struct snd_seq_client *client;
2172 va_list args;
2173
2174 if (snd_BUG_ON(in_interrupt()))
2175 return -EBUSY;
2176
2177 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2178 return -EINVAL;
2179 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2180 return -EINVAL;
2181
2182 if (mutex_lock_interruptible(&register_mutex))
2183 return -ERESTARTSYS;
2184
2185 if (card) {
2186 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2187 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2188 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2189 client_index = -1;
2190 }
2191
2192 /* empty write queue as default */
2193 client = seq_create_client1(client_index, 0);
2194 if (client == NULL) {
2195 mutex_unlock(&register_mutex);
2196 return -EBUSY; /* failure code */
2197 }
2198 usage_alloc(&client_usage, 1);
2199
2200 client->accept_input = 1;
2201 client->accept_output = 1;
2202 client->data.kernel.card = card;
2203
2204 va_start(args, name_fmt);
2205 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2206 va_end(args);
2207
2208 client->type = KERNEL_CLIENT;
2209 mutex_unlock(&register_mutex);
2210
2211 /* make others aware this new client */
2212 snd_seq_system_client_ev_client_start(client->number);
2213
2214 /* return client number to caller */
2215 return client->number;
2216 }
2217 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2218
2219 /* exported to kernel modules */
2220 int snd_seq_delete_kernel_client(int client)
2221 {
2222 struct snd_seq_client *ptr;
2223
2224 if (snd_BUG_ON(in_interrupt()))
2225 return -EBUSY;
2226
2227 ptr = clientptr(client);
2228 if (ptr == NULL)
2229 return -EINVAL;
2230
2231 seq_free_client(ptr);
2232 kfree(ptr);
2233 return 0;
2234 }
2235 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2236
2237 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2238 * and snd_seq_kernel_client_enqueue_blocking
2239 */
2240 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2241 struct file *file, int blocking,
2242 int atomic, int hop)
2243 {
2244 struct snd_seq_client *cptr;
2245 int result;
2246
2247 if (snd_BUG_ON(!ev))
2248 return -EINVAL;
2249
2250 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2251 return 0; /* ignore this */
2252 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2253 return -EINVAL; /* quoted events can't be enqueued */
2254
2255 /* fill in client number */
2256 ev->source.client = client;
2257
2258 if (check_event_type_and_length(ev))
2259 return -EINVAL;
2260
2261 cptr = snd_seq_client_use_ptr(client);
2262 if (cptr == NULL)
2263 return -EINVAL;
2264
2265 if (! cptr->accept_output)
2266 result = -EPERM;
2267 else /* send it */
2268 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2269 atomic, hop, NULL);
2270
2271 snd_seq_client_unlock(cptr);
2272 return result;
2273 }
2274
2275 /*
2276 * exported, called by kernel clients to enqueue events (w/o blocking)
2277 *
2278 * RETURN VALUE: zero if succeed, negative if error
2279 */
2280 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2281 int atomic, int hop)
2282 {
2283 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2284 }
2285 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2286
2287 /*
2288 * exported, called by kernel clients to enqueue events (with blocking)
2289 *
2290 * RETURN VALUE: zero if succeed, negative if error
2291 */
2292 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2293 struct file *file,
2294 int atomic, int hop)
2295 {
2296 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2297 }
2298 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2299
2300 /*
2301 * exported, called by kernel clients to dispatch events directly to other
2302 * clients, bypassing the queues. Event time-stamp will be updated.
2303 *
2304 * RETURN VALUE: negative = delivery failed,
2305 * zero, or positive: the number of delivered events
2306 */
2307 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2308 int atomic, int hop)
2309 {
2310 struct snd_seq_client *cptr;
2311 int result;
2312
2313 if (snd_BUG_ON(!ev))
2314 return -EINVAL;
2315
2316 /* fill in client number */
2317 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2318 ev->source.client = client;
2319
2320 if (check_event_type_and_length(ev))
2321 return -EINVAL;
2322
2323 cptr = snd_seq_client_use_ptr(client);
2324 if (cptr == NULL)
2325 return -EINVAL;
2326
2327 if (!cptr->accept_output)
2328 result = -EPERM;
2329 else
2330 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2331
2332 snd_seq_client_unlock(cptr);
2333 return result;
2334 }
2335 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2336
2337 /**
2338 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2339 * kernel space.
2340 * @clientid: A numerical ID for a client.
2341 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2342 * @arg: A pointer to data in kernel space.
2343 *
2344 * Against its name, both kernel/application client can be handled by this
2345 * kernel API. A pointer of 'arg' argument should be in kernel space.
2346 *
2347 * Return: 0 at success. Negative error code at failure.
2348 */
2349 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2350 {
2351 const struct ioctl_handler *handler;
2352 struct snd_seq_client *client;
2353
2354 client = clientptr(clientid);
2355 if (client == NULL)
2356 return -ENXIO;
2357
2358 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2359 if (handler->cmd == cmd)
2360 return handler->func(client, arg);
2361 }
2362
2363 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2364 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2365 return -ENOTTY;
2366 }
2367 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2368
2369 /* exported (for OSS emulator) */
2370 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2371 {
2372 struct snd_seq_client *client;
2373
2374 client = clientptr(clientid);
2375 if (client == NULL)
2376 return -ENXIO;
2377
2378 if (! snd_seq_write_pool_allocated(client))
2379 return 1;
2380 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2381 return 1;
2382 return 0;
2383 }
2384 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2385
2386 /*---------------------------------------------------------------------------*/
2387
2388 #ifdef CONFIG_SND_PROC_FS
2389 /*
2390 * /proc interface
2391 */
2392 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2393 struct snd_seq_port_subs_info *group,
2394 int is_src, char *msg)
2395 {
2396 struct list_head *p;
2397 struct snd_seq_subscribers *s;
2398 int count = 0;
2399
2400 down_read(&group->list_mutex);
2401 if (list_empty(&group->list_head)) {
2402 up_read(&group->list_mutex);
2403 return;
2404 }
2405 snd_iprintf(buffer, msg);
2406 list_for_each(p, &group->list_head) {
2407 if (is_src)
2408 s = list_entry(p, struct snd_seq_subscribers, src_list);
2409 else
2410 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2411 if (count++)
2412 snd_iprintf(buffer, ", ");
2413 snd_iprintf(buffer, "%d:%d",
2414 is_src ? s->info.dest.client : s->info.sender.client,
2415 is_src ? s->info.dest.port : s->info.sender.port);
2416 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2417 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2418 if (group->exclusive)
2419 snd_iprintf(buffer, "[ex]");
2420 }
2421 up_read(&group->list_mutex);
2422 snd_iprintf(buffer, "\n");
2423 }
2424
2425 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2426 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2427 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2428
2429 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2430
2431 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2432 struct snd_seq_client *client)
2433 {
2434 struct snd_seq_client_port *p;
2435
2436 mutex_lock(&client->ports_mutex);
2437 list_for_each_entry(p, &client->ports_list_head, list) {
2438 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2439 p->addr.port, p->name,
2440 FLAG_PERM_RD(p->capability),
2441 FLAG_PERM_WR(p->capability),
2442 FLAG_PERM_EX(p->capability),
2443 FLAG_PERM_DUPLEX(p->capability));
2444 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2445 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2446 }
2447 mutex_unlock(&client->ports_mutex);
2448 }
2449
2450
2451 /* exported to seq_info.c */
2452 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2453 struct snd_info_buffer *buffer)
2454 {
2455 int c;
2456 struct snd_seq_client *client;
2457
2458 snd_iprintf(buffer, "Client info\n");
2459 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2460 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2461 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2462 snd_iprintf(buffer, "\n");
2463
2464 /* list the client table */
2465 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2466 client = snd_seq_client_use_ptr(c);
2467 if (client == NULL)
2468 continue;
2469 if (client->type == NO_CLIENT) {
2470 snd_seq_client_unlock(client);
2471 continue;
2472 }
2473
2474 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2475 c, client->name,
2476 client->type == USER_CLIENT ? "User" : "Kernel");
2477 snd_seq_info_dump_ports(buffer, client);
2478 if (snd_seq_write_pool_allocated(client)) {
2479 snd_iprintf(buffer, " Output pool :\n");
2480 snd_seq_info_pool(buffer, client->pool, " ");
2481 }
2482 if (client->type == USER_CLIENT && client->data.user.fifo &&
2483 client->data.user.fifo->pool) {
2484 snd_iprintf(buffer, " Input pool :\n");
2485 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2486 }
2487 snd_seq_client_unlock(client);
2488 }
2489 }
2490 #endif /* CONFIG_SND_PROC_FS */
2491
2492 /*---------------------------------------------------------------------------*/
2493
2494
2495 /*
2496 * REGISTRATION PART
2497 */
2498
2499 static const struct file_operations snd_seq_f_ops =
2500 {
2501 .owner = THIS_MODULE,
2502 .read = snd_seq_read,
2503 .write = snd_seq_write,
2504 .open = snd_seq_open,
2505 .release = snd_seq_release,
2506 .llseek = no_llseek,
2507 .poll = snd_seq_poll,
2508 .unlocked_ioctl = snd_seq_ioctl,
2509 .compat_ioctl = snd_seq_ioctl_compat,
2510 };
2511
2512 static struct device seq_dev;
2513
2514 /*
2515 * register sequencer device
2516 */
2517 int __init snd_sequencer_device_init(void)
2518 {
2519 int err;
2520
2521 snd_device_initialize(&seq_dev, NULL);
2522 dev_set_name(&seq_dev, "seq");
2523
2524 if (mutex_lock_interruptible(&register_mutex))
2525 return -ERESTARTSYS;
2526
2527 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2528 &snd_seq_f_ops, NULL, &seq_dev);
2529 if (err < 0) {
2530 mutex_unlock(&register_mutex);
2531 put_device(&seq_dev);
2532 return err;
2533 }
2534
2535 mutex_unlock(&register_mutex);
2536
2537 return 0;
2538 }
2539
2540
2541
2542 /*
2543 * unregister sequencer device
2544 */
2545 void __exit snd_sequencer_device_done(void)
2546 {
2547 snd_unregister_device(&seq_dev);
2548 put_device(&seq_dev);
2549 }
Linux with added FPC-III support