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fs/adfs: move append_filetype_suffix() into adfs_object_fixup()
[linux-2.6/linux-2.6-arm.git] / sound / core / seq / seq_clientmgr.c
blob38e7deab638479ef9525c67fcd4f0fe37101cfb2
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 mutex_lock(&register_mutex);
315 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
316 if (!client) {
317 mutex_unlock(&register_mutex);
318 return -ENOMEM; /* failure code */
319 }
320
321 mode = snd_seq_file_flags(file);
322 if (mode & SNDRV_SEQ_LFLG_INPUT)
323 client->accept_input = 1;
324 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
325 client->accept_output = 1;
326
327 user = &client->data.user;
328 user->fifo = NULL;
329 user->fifo_pool_size = 0;
330
331 if (mode & SNDRV_SEQ_LFLG_INPUT) {
332 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
333 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
334 if (user->fifo == NULL) {
335 seq_free_client1(client);
336 kfree(client);
337 mutex_unlock(&register_mutex);
338 return -ENOMEM;
339 }
340 }
341
342 usage_alloc(&client_usage, 1);
343 client->type = USER_CLIENT;
344 mutex_unlock(&register_mutex);
345
346 c = client->number;
347 file->private_data = client;
348
349 /* fill client data */
350 user->file = file;
351 sprintf(client->name, "Client-%d", c);
352 client->data.user.owner = get_pid(task_pid(current));
353
354 /* make others aware this new client */
355 snd_seq_system_client_ev_client_start(c);
356
357 return 0;
358 }
359
360 /* delete a user client */
361 static int snd_seq_release(struct inode *inode, struct file *file)
362 {
363 struct snd_seq_client *client = file->private_data;
364
365 if (client) {
366 seq_free_client(client);
367 if (client->data.user.fifo)
368 snd_seq_fifo_delete(&client->data.user.fifo);
369 put_pid(client->data.user.owner);
370 kfree(client);
371 }
372
373 return 0;
374 }
375
376
377 /* handle client read() */
378 /* possible error values:
379 * -ENXIO invalid client or file open mode
380 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
381 * -EINVAL no enough user-space buffer to write the whole event
382 * -EFAULT seg. fault during copy to user space
383 */
384 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
385 loff_t *offset)
386 {
387 struct snd_seq_client *client = file->private_data;
388 struct snd_seq_fifo *fifo;
389 int err;
390 long result = 0;
391 struct snd_seq_event_cell *cell;
392
393 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
394 return -ENXIO;
395
396 if (!access_ok(buf, count))
397 return -EFAULT;
398
399 /* check client structures are in place */
400 if (snd_BUG_ON(!client))
401 return -ENXIO;
402
403 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
404 return -ENXIO;
405
406 if (atomic_read(&fifo->overflow) > 0) {
407 /* buffer overflow is detected */
408 snd_seq_fifo_clear(fifo);
409 /* return error code */
410 return -ENOSPC;
411 }
412
413 cell = NULL;
414 err = 0;
415 snd_seq_fifo_lock(fifo);
416
417 /* while data available in queue */
418 while (count >= sizeof(struct snd_seq_event)) {
419 int nonblock;
420
421 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
422 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
423 break;
424 }
425 if (snd_seq_ev_is_variable(&cell->event)) {
426 struct snd_seq_event tmpev;
427 tmpev = cell->event;
428 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
429 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
430 err = -EFAULT;
431 break;
432 }
433 count -= sizeof(struct snd_seq_event);
434 buf += sizeof(struct snd_seq_event);
435 err = snd_seq_expand_var_event(&cell->event, count,
436 (char __force *)buf, 0,
437 sizeof(struct snd_seq_event));
438 if (err < 0)
439 break;
440 result += err;
441 count -= err;
442 buf += err;
443 } else {
444 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
445 err = -EFAULT;
446 break;
447 }
448 count -= sizeof(struct snd_seq_event);
449 buf += sizeof(struct snd_seq_event);
450 }
451 snd_seq_cell_free(cell);
452 cell = NULL; /* to be sure */
453 result += sizeof(struct snd_seq_event);
454 }
455
456 if (err < 0) {
457 if (cell)
458 snd_seq_fifo_cell_putback(fifo, cell);
459 if (err == -EAGAIN && result > 0)
460 err = 0;
461 }
462 snd_seq_fifo_unlock(fifo);
463
464 return (err < 0) ? err : result;
465 }
466
467
468 /*
469 * check access permission to the port
470 */
471 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
472 {
473 if ((port->capability & flags) != flags)
474 return 0;
475 return flags;
476 }
477
478 /*
479 * check if the destination client is available, and return the pointer
480 * if filter is non-zero, client filter bitmap is tested.
481 */
482 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
483 int filter)
484 {
485 struct snd_seq_client *dest;
486
487 dest = snd_seq_client_use_ptr(event->dest.client);
488 if (dest == NULL)
489 return NULL;
490 if (! dest->accept_input)
491 goto __not_avail;
492 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
493 ! test_bit(event->type, dest->event_filter))
494 goto __not_avail;
495 if (filter && !(dest->filter & filter))
496 goto __not_avail;
497
498 return dest; /* ok - accessible */
499 __not_avail:
500 snd_seq_client_unlock(dest);
501 return NULL;
502 }
503
504
505 /*
506 * Return the error event.
507 *
508 * If the receiver client is a user client, the original event is
509 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
510 * the original event is also variable length, the external data is
511 * copied after the event record.
512 * If the receiver client is a kernel client, the original event is
513 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
514 * kmalloc.
515 */
516 static int bounce_error_event(struct snd_seq_client *client,
517 struct snd_seq_event *event,
518 int err, int atomic, int hop)
519 {
520 struct snd_seq_event bounce_ev;
521 int result;
522
523 if (client == NULL ||
524 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
525 ! client->accept_input)
526 return 0; /* ignored */
527
528 /* set up quoted error */
529 memset(&bounce_ev, 0, sizeof(bounce_ev));
530 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
531 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
532 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
533 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
534 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
535 bounce_ev.dest.client = client->number;
536 bounce_ev.dest.port = event->source.port;
537 bounce_ev.data.quote.origin = event->dest;
538 bounce_ev.data.quote.event = event;
539 bounce_ev.data.quote.value = -err; /* use positive value */
540 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
541 if (result < 0) {
542 client->event_lost++;
543 return result;
544 }
545
546 return result;
547 }
548
549
550 /*
551 * rewrite the time-stamp of the event record with the curren time
552 * of the given queue.
553 * return non-zero if updated.
554 */
555 static int update_timestamp_of_queue(struct snd_seq_event *event,
556 int queue, int real_time)
557 {
558 struct snd_seq_queue *q;
559
560 q = queueptr(queue);
561 if (! q)
562 return 0;
563 event->queue = queue;
564 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
565 if (real_time) {
566 event->time.time = snd_seq_timer_get_cur_time(q->timer);
567 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
568 } else {
569 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
570 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
571 }
572 queuefree(q);
573 return 1;
574 }
575
576
577 /*
578 * deliver an event to the specified destination.
579 * if filter is non-zero, client filter bitmap is tested.
580 *
581 * RETURN VALUE: 0 : if succeeded
582 * <0 : error
583 */
584 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
585 struct snd_seq_event *event,
586 int filter, int atomic, int hop)
587 {
588 struct snd_seq_client *dest = NULL;
589 struct snd_seq_client_port *dest_port = NULL;
590 int result = -ENOENT;
591 int direct;
592
593 direct = snd_seq_ev_is_direct(event);
594
595 dest = get_event_dest_client(event, filter);
596 if (dest == NULL)
597 goto __skip;
598 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
599 if (dest_port == NULL)
600 goto __skip;
601
602 /* check permission */
603 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
604 result = -EPERM;
605 goto __skip;
606 }
607
608 if (dest_port->timestamping)
609 update_timestamp_of_queue(event, dest_port->time_queue,
610 dest_port->time_real);
611
612 switch (dest->type) {
613 case USER_CLIENT:
614 if (dest->data.user.fifo)
615 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
616 break;
617
618 case KERNEL_CLIENT:
619 if (dest_port->event_input == NULL)
620 break;
621 result = dest_port->event_input(event, direct,
622 dest_port->private_data,
623 atomic, hop);
624 break;
625 default:
626 break;
627 }
628
629 __skip:
630 if (dest_port)
631 snd_seq_port_unlock(dest_port);
632 if (dest)
633 snd_seq_client_unlock(dest);
634
635 if (result < 0 && !direct) {
636 result = bounce_error_event(client, event, result, atomic, hop);
637 }
638 return result;
639 }
640
641
642 /*
643 * send the event to all subscribers:
644 */
645 static int deliver_to_subscribers(struct snd_seq_client *client,
646 struct snd_seq_event *event,
647 int atomic, int hop)
648 {
649 struct snd_seq_subscribers *subs;
650 int err, result = 0, num_ev = 0;
651 struct snd_seq_event event_saved;
652 struct snd_seq_client_port *src_port;
653 struct snd_seq_port_subs_info *grp;
654
655 src_port = snd_seq_port_use_ptr(client, event->source.port);
656 if (src_port == NULL)
657 return -EINVAL; /* invalid source port */
658 /* save original event record */
659 event_saved = *event;
660 grp = &src_port->c_src;
661
662 /* lock list */
663 if (atomic)
664 read_lock(&grp->list_lock);
665 else
666 down_read_nested(&grp->list_mutex, hop);
667 list_for_each_entry(subs, &grp->list_head, src_list) {
668 /* both ports ready? */
669 if (atomic_read(&subs->ref_count) != 2)
670 continue;
671 event->dest = subs->info.dest;
672 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
673 /* convert time according to flag with subscription */
674 update_timestamp_of_queue(event, subs->info.queue,
675 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
676 err = snd_seq_deliver_single_event(client, event,
677 0, atomic, hop);
678 if (err < 0) {
679 /* save first error that occurs and continue */
680 if (!result)
681 result = err;
682 continue;
683 }
684 num_ev++;
685 /* restore original event record */
686 *event = event_saved;
687 }
688 if (atomic)
689 read_unlock(&grp->list_lock);
690 else
691 up_read(&grp->list_mutex);
692 *event = event_saved; /* restore */
693 snd_seq_port_unlock(src_port);
694 return (result < 0) ? result : num_ev;
695 }
696
697
698 #ifdef SUPPORT_BROADCAST
699 /*
700 * broadcast to all ports:
701 */
702 static int port_broadcast_event(struct snd_seq_client *client,
703 struct snd_seq_event *event,
704 int atomic, int hop)
705 {
706 int num_ev = 0, err, result = 0;
707 struct snd_seq_client *dest_client;
708 struct snd_seq_client_port *port;
709
710 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
711 if (dest_client == NULL)
712 return 0; /* no matching destination */
713
714 read_lock(&dest_client->ports_lock);
715 list_for_each_entry(port, &dest_client->ports_list_head, list) {
716 event->dest.port = port->addr.port;
717 /* pass NULL as source client to avoid error bounce */
718 err = snd_seq_deliver_single_event(NULL, event,
719 SNDRV_SEQ_FILTER_BROADCAST,
720 atomic, hop);
721 if (err < 0) {
722 /* save first error that occurs and continue */
723 if (!result)
724 result = err;
725 continue;
726 }
727 num_ev++;
728 }
729 read_unlock(&dest_client->ports_lock);
730 snd_seq_client_unlock(dest_client);
731 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
732 return (result < 0) ? result : num_ev;
733 }
734
735 /*
736 * send the event to all clients:
737 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
738 */
739 static int broadcast_event(struct snd_seq_client *client,
740 struct snd_seq_event *event, int atomic, int hop)
741 {
742 int err, result = 0, num_ev = 0;
743 int dest;
744 struct snd_seq_addr addr;
745
746 addr = event->dest; /* save */
747
748 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
749 /* don't send to itself */
750 if (dest == client->number)
751 continue;
752 event->dest.client = dest;
753 event->dest.port = addr.port;
754 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
755 err = port_broadcast_event(client, event, atomic, hop);
756 else
757 /* pass NULL as source client to avoid error bounce */
758 err = snd_seq_deliver_single_event(NULL, event,
759 SNDRV_SEQ_FILTER_BROADCAST,
760 atomic, hop);
761 if (err < 0) {
762 /* save first error that occurs and continue */
763 if (!result)
764 result = err;
765 continue;
766 }
767 num_ev += err;
768 }
769 event->dest = addr; /* restore */
770 return (result < 0) ? result : num_ev;
771 }
772
773
774 /* multicast - not supported yet */
775 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
776 int atomic, int hop)
777 {
778 pr_debug("ALSA: seq: multicast not supported yet.\n");
779 return 0; /* ignored */
780 }
781 #endif /* SUPPORT_BROADCAST */
782
783
784 /* deliver an event to the destination port(s).
785 * if the event is to subscribers or broadcast, the event is dispatched
786 * to multiple targets.
787 *
788 * RETURN VALUE: n > 0 : the number of delivered events.
789 * n == 0 : the event was not passed to any client.
790 * n < 0 : error - event was not processed.
791 */
792 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
793 int atomic, int hop)
794 {
795 int result;
796
797 hop++;
798 if (hop >= SNDRV_SEQ_MAX_HOPS) {
799 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
800 event->source.client, event->source.port,
801 event->dest.client, event->dest.port);
802 return -EMLINK;
803 }
804
805 if (snd_seq_ev_is_variable(event) &&
806 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
807 return -EINVAL;
808
809 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
810 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
811 result = deliver_to_subscribers(client, event, atomic, hop);
812 #ifdef SUPPORT_BROADCAST
813 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
814 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
815 result = broadcast_event(client, event, atomic, hop);
816 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
817 result = multicast_event(client, event, atomic, hop);
818 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
819 result = port_broadcast_event(client, event, atomic, hop);
820 #endif
821 else
822 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
823
824 return result;
825 }
826
827 /*
828 * dispatch an event cell:
829 * This function is called only from queue check routines in timer
830 * interrupts or after enqueued.
831 * The event cell shall be released or re-queued in this function.
832 *
833 * RETURN VALUE: n > 0 : the number of delivered events.
834 * n == 0 : the event was not passed to any client.
835 * n < 0 : error - event was not processed.
836 */
837 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
838 {
839 struct snd_seq_client *client;
840 int result;
841
842 if (snd_BUG_ON(!cell))
843 return -EINVAL;
844
845 client = snd_seq_client_use_ptr(cell->event.source.client);
846 if (client == NULL) {
847 snd_seq_cell_free(cell); /* release this cell */
848 return -EINVAL;
849 }
850
851 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
852 /* NOTE event:
853 * the event cell is re-used as a NOTE-OFF event and
854 * enqueued again.
855 */
856 struct snd_seq_event tmpev, *ev;
857
858 /* reserve this event to enqueue note-off later */
859 tmpev = cell->event;
860 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
861 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
862
863 /*
864 * This was originally a note event. We now re-use the
865 * cell for the note-off event.
866 */
867
868 ev = &cell->event;
869 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
870 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
871
872 /* add the duration time */
873 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
874 case SNDRV_SEQ_TIME_STAMP_TICK:
875 ev->time.tick += ev->data.note.duration;
876 break;
877 case SNDRV_SEQ_TIME_STAMP_REAL:
878 /* unit for duration is ms */
879 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
880 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
881 ev->time.time.tv_nsec / 1000000000;
882 ev->time.time.tv_nsec %= 1000000000;
883 break;
884 }
885 ev->data.note.velocity = ev->data.note.off_velocity;
886
887 /* Now queue this cell as the note off event */
888 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
889 snd_seq_cell_free(cell); /* release this cell */
890
891 } else {
892 /* Normal events:
893 * event cell is freed after processing the event
894 */
895
896 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
897 snd_seq_cell_free(cell);
898 }
899
900 snd_seq_client_unlock(client);
901 return result;
902 }
903
904
905 /* Allocate a cell from client pool and enqueue it to queue:
906 * if pool is empty and blocking is TRUE, sleep until a new cell is
907 * available.
908 */
909 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
910 struct snd_seq_event *event,
911 struct file *file, int blocking,
912 int atomic, int hop,
913 struct mutex *mutexp)
914 {
915 struct snd_seq_event_cell *cell;
916 int err;
917
918 /* special queue values - force direct passing */
919 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
920 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
921 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
922 } else
923 #ifdef SUPPORT_BROADCAST
924 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
925 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
926 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
927 }
928 #endif
929 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
930 /* check presence of source port */
931 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
932 if (src_port == NULL)
933 return -EINVAL;
934 snd_seq_port_unlock(src_port);
935 }
936
937 /* direct event processing without enqueued */
938 if (snd_seq_ev_is_direct(event)) {
939 if (event->type == SNDRV_SEQ_EVENT_NOTE)
940 return -EINVAL; /* this event must be enqueued! */
941 return snd_seq_deliver_event(client, event, atomic, hop);
942 }
943
944 /* Not direct, normal queuing */
945 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
946 return -EINVAL; /* invalid queue */
947 if (! snd_seq_write_pool_allocated(client))
948 return -ENXIO; /* queue is not allocated */
949
950 /* allocate an event cell */
951 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
952 file, mutexp);
953 if (err < 0)
954 return err;
955
956 /* we got a cell. enqueue it. */
957 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
958 snd_seq_cell_free(cell);
959 return err;
960 }
961
962 return 0;
963 }
964
965
966 /*
967 * check validity of event type and data length.
968 * return non-zero if invalid.
969 */
970 static int check_event_type_and_length(struct snd_seq_event *ev)
971 {
972 switch (snd_seq_ev_length_type(ev)) {
973 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
974 if (snd_seq_ev_is_variable_type(ev))
975 return -EINVAL;
976 break;
977 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
978 if (! snd_seq_ev_is_variable_type(ev) ||
979 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
980 return -EINVAL;
981 break;
982 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
983 if (! snd_seq_ev_is_direct(ev))
984 return -EINVAL;
985 break;
986 }
987 return 0;
988 }
989
990
991 /* handle write() */
992 /* possible error values:
993 * -ENXIO invalid client or file open mode
994 * -ENOMEM malloc failed
995 * -EFAULT seg. fault during copy from user space
996 * -EINVAL invalid event
997 * -EAGAIN no space in output pool
998 * -EINTR interrupts while sleep
999 * -EMLINK too many hops
1000 * others depends on return value from driver callback
1001 */
1002 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1003 size_t count, loff_t *offset)
1004 {
1005 struct snd_seq_client *client = file->private_data;
1006 int written = 0, len;
1007 int err;
1008 struct snd_seq_event event;
1009
1010 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1011 return -ENXIO;
1012
1013 /* check client structures are in place */
1014 if (snd_BUG_ON(!client))
1015 return -ENXIO;
1016
1017 if (!client->accept_output || client->pool == NULL)
1018 return -ENXIO;
1019
1020 /* allocate the pool now if the pool is not allocated yet */
1021 mutex_lock(&client->ioctl_mutex);
1022 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1023 err = snd_seq_pool_init(client->pool);
1024 if (err < 0)
1025 goto out;
1026 }
1027
1028 /* only process whole events */
1029 err = -EINVAL;
1030 while (count >= sizeof(struct snd_seq_event)) {
1031 /* Read in the event header from the user */
1032 len = sizeof(event);
1033 if (copy_from_user(&event, buf, len)) {
1034 err = -EFAULT;
1035 break;
1036 }
1037 event.source.client = client->number; /* fill in client number */
1038 /* Check for extension data length */
1039 if (check_event_type_and_length(&event)) {
1040 err = -EINVAL;
1041 break;
1042 }
1043
1044 /* check for special events */
1045 if (event.type == SNDRV_SEQ_EVENT_NONE)
1046 goto __skip_event;
1047 else if (snd_seq_ev_is_reserved(&event)) {
1048 err = -EINVAL;
1049 break;
1050 }
1051
1052 if (snd_seq_ev_is_variable(&event)) {
1053 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1054 if ((size_t)(extlen + len) > count) {
1055 /* back out, will get an error this time or next */
1056 err = -EINVAL;
1057 break;
1058 }
1059 /* set user space pointer */
1060 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1061 event.data.ext.ptr = (char __force *)buf
1062 + sizeof(struct snd_seq_event);
1063 len += extlen; /* increment data length */
1064 } else {
1065 #ifdef CONFIG_COMPAT
1066 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1067 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1068 event.data.ext.ptr = ptr;
1069 }
1070 #endif
1071 }
1072
1073 /* ok, enqueue it */
1074 err = snd_seq_client_enqueue_event(client, &event, file,
1075 !(file->f_flags & O_NONBLOCK),
1076 0, 0, &client->ioctl_mutex);
1077 if (err < 0)
1078 break;
1079
1080 __skip_event:
1081 /* Update pointers and counts */
1082 count -= len;
1083 buf += len;
1084 written += len;
1085 }
1086
1087 out:
1088 mutex_unlock(&client->ioctl_mutex);
1089 return written ? written : err;
1090 }
1091
1092
1093 /*
1094 * handle polling
1095 */
1096 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1097 {
1098 struct snd_seq_client *client = file->private_data;
1099 __poll_t mask = 0;
1100
1101 /* check client structures are in place */
1102 if (snd_BUG_ON(!client))
1103 return EPOLLERR;
1104
1105 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1106 client->data.user.fifo) {
1107
1108 /* check if data is available in the outqueue */
1109 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1110 mask |= EPOLLIN | EPOLLRDNORM;
1111 }
1112
1113 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1114
1115 /* check if data is available in the pool */
1116 if (!snd_seq_write_pool_allocated(client) ||
1117 snd_seq_pool_poll_wait(client->pool, file, wait))
1118 mask |= EPOLLOUT | EPOLLWRNORM;
1119 }
1120
1121 return mask;
1122 }
1123
1124
1125 /*-----------------------------------------------------*/
1126
1127 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1128 {
1129 int *pversion = arg;
1130
1131 *pversion = SNDRV_SEQ_VERSION;
1132 return 0;
1133 }
1134
1135 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1136 {
1137 int *client_id = arg;
1138
1139 *client_id = client->number;
1140 return 0;
1141 }
1142
1143 /* SYSTEM_INFO ioctl() */
1144 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1145 {
1146 struct snd_seq_system_info *info = arg;
1147
1148 memset(info, 0, sizeof(*info));
1149 /* fill the info fields */
1150 info->queues = SNDRV_SEQ_MAX_QUEUES;
1151 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1152 info->ports = SNDRV_SEQ_MAX_PORTS;
1153 info->channels = 256; /* fixed limit */
1154 info->cur_clients = client_usage.cur;
1155 info->cur_queues = snd_seq_queue_get_cur_queues();
1156
1157 return 0;
1158 }
1159
1160
1161 /* RUNNING_MODE ioctl() */
1162 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1163 {
1164 struct snd_seq_running_info *info = arg;
1165 struct snd_seq_client *cptr;
1166 int err = 0;
1167
1168 /* requested client number */
1169 cptr = snd_seq_client_use_ptr(info->client);
1170 if (cptr == NULL)
1171 return -ENOENT; /* don't change !!! */
1172
1173 #ifdef SNDRV_BIG_ENDIAN
1174 if (!info->big_endian) {
1175 err = -EINVAL;
1176 goto __err;
1177 }
1178 #else
1179 if (info->big_endian) {
1180 err = -EINVAL;
1181 goto __err;
1182 }
1183
1184 #endif
1185 if (info->cpu_mode > sizeof(long)) {
1186 err = -EINVAL;
1187 goto __err;
1188 }
1189 cptr->convert32 = (info->cpu_mode < sizeof(long));
1190 __err:
1191 snd_seq_client_unlock(cptr);
1192 return err;
1193 }
1194
1195 /* CLIENT_INFO ioctl() */
1196 static void get_client_info(struct snd_seq_client *cptr,
1197 struct snd_seq_client_info *info)
1198 {
1199 info->client = cptr->number;
1200
1201 /* fill the info fields */
1202 info->type = cptr->type;
1203 strcpy(info->name, cptr->name);
1204 info->filter = cptr->filter;
1205 info->event_lost = cptr->event_lost;
1206 memcpy(info->event_filter, cptr->event_filter, 32);
1207 info->num_ports = cptr->num_ports;
1208
1209 if (cptr->type == USER_CLIENT)
1210 info->pid = pid_vnr(cptr->data.user.owner);
1211 else
1212 info->pid = -1;
1213
1214 if (cptr->type == KERNEL_CLIENT)
1215 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1216 else
1217 info->card = -1;
1218
1219 memset(info->reserved, 0, sizeof(info->reserved));
1220 }
1221
1222 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1223 void *arg)
1224 {
1225 struct snd_seq_client_info *client_info = arg;
1226 struct snd_seq_client *cptr;
1227
1228 /* requested client number */
1229 cptr = snd_seq_client_use_ptr(client_info->client);
1230 if (cptr == NULL)
1231 return -ENOENT; /* don't change !!! */
1232
1233 get_client_info(cptr, client_info);
1234 snd_seq_client_unlock(cptr);
1235
1236 return 0;
1237 }
1238
1239
1240 /* CLIENT_INFO ioctl() */
1241 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1242 void *arg)
1243 {
1244 struct snd_seq_client_info *client_info = arg;
1245
1246 /* it is not allowed to set the info fields for an another client */
1247 if (client->number != client_info->client)
1248 return -EPERM;
1249 /* also client type must be set now */
1250 if (client->type != client_info->type)
1251 return -EINVAL;
1252
1253 /* fill the info fields */
1254 if (client_info->name[0])
1255 strscpy(client->name, client_info->name, sizeof(client->name));
1256
1257 client->filter = client_info->filter;
1258 client->event_lost = client_info->event_lost;
1259 memcpy(client->event_filter, client_info->event_filter, 32);
1260
1261 return 0;
1262 }
1263
1264
1265 /*
1266 * CREATE PORT ioctl()
1267 */
1268 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1269 {
1270 struct snd_seq_port_info *info = arg;
1271 struct snd_seq_client_port *port;
1272 struct snd_seq_port_callback *callback;
1273 int port_idx;
1274
1275 /* it is not allowed to create the port for an another client */
1276 if (info->addr.client != client->number)
1277 return -EPERM;
1278
1279 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1280 if (port == NULL)
1281 return -ENOMEM;
1282
1283 if (client->type == USER_CLIENT && info->kernel) {
1284 port_idx = port->addr.port;
1285 snd_seq_port_unlock(port);
1286 snd_seq_delete_port(client, port_idx);
1287 return -EINVAL;
1288 }
1289 if (client->type == KERNEL_CLIENT) {
1290 if ((callback = info->kernel) != NULL) {
1291 if (callback->owner)
1292 port->owner = callback->owner;
1293 port->private_data = callback->private_data;
1294 port->private_free = callback->private_free;
1295 port->event_input = callback->event_input;
1296 port->c_src.open = callback->subscribe;
1297 port->c_src.close = callback->unsubscribe;
1298 port->c_dest.open = callback->use;
1299 port->c_dest.close = callback->unuse;
1300 }
1301 }
1302
1303 info->addr = port->addr;
1304
1305 snd_seq_set_port_info(port, info);
1306 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1307 snd_seq_port_unlock(port);
1308
1309 return 0;
1310 }
1311
1312 /*
1313 * DELETE PORT ioctl()
1314 */
1315 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1316 {
1317 struct snd_seq_port_info *info = arg;
1318 int err;
1319
1320 /* it is not allowed to remove the port for an another client */
1321 if (info->addr.client != client->number)
1322 return -EPERM;
1323
1324 err = snd_seq_delete_port(client, info->addr.port);
1325 if (err >= 0)
1326 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1327 return err;
1328 }
1329
1330
1331 /*
1332 * GET_PORT_INFO ioctl() (on any client)
1333 */
1334 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1335 {
1336 struct snd_seq_port_info *info = arg;
1337 struct snd_seq_client *cptr;
1338 struct snd_seq_client_port *port;
1339
1340 cptr = snd_seq_client_use_ptr(info->addr.client);
1341 if (cptr == NULL)
1342 return -ENXIO;
1343
1344 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1345 if (port == NULL) {
1346 snd_seq_client_unlock(cptr);
1347 return -ENOENT; /* don't change */
1348 }
1349
1350 /* get port info */
1351 snd_seq_get_port_info(port, info);
1352 snd_seq_port_unlock(port);
1353 snd_seq_client_unlock(cptr);
1354
1355 return 0;
1356 }
1357
1358
1359 /*
1360 * SET_PORT_INFO ioctl() (only ports on this/own client)
1361 */
1362 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1363 {
1364 struct snd_seq_port_info *info = arg;
1365 struct snd_seq_client_port *port;
1366
1367 if (info->addr.client != client->number) /* only set our own ports ! */
1368 return -EPERM;
1369 port = snd_seq_port_use_ptr(client, info->addr.port);
1370 if (port) {
1371 snd_seq_set_port_info(port, info);
1372 snd_seq_port_unlock(port);
1373 }
1374 return 0;
1375 }
1376
1377
1378 /*
1379 * port subscription (connection)
1380 */
1381 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1382 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1383
1384 static int check_subscription_permission(struct snd_seq_client *client,
1385 struct snd_seq_client_port *sport,
1386 struct snd_seq_client_port *dport,
1387 struct snd_seq_port_subscribe *subs)
1388 {
1389 if (client->number != subs->sender.client &&
1390 client->number != subs->dest.client) {
1391 /* connection by third client - check export permission */
1392 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1393 return -EPERM;
1394 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1395 return -EPERM;
1396 }
1397
1398 /* check read permission */
1399 /* if sender or receiver is the subscribing client itself,
1400 * no permission check is necessary
1401 */
1402 if (client->number != subs->sender.client) {
1403 if (! check_port_perm(sport, PERM_RD))
1404 return -EPERM;
1405 }
1406 /* check write permission */
1407 if (client->number != subs->dest.client) {
1408 if (! check_port_perm(dport, PERM_WR))
1409 return -EPERM;
1410 }
1411 return 0;
1412 }
1413
1414 /*
1415 * send an subscription notify event to user client:
1416 * client must be user client.
1417 */
1418 int snd_seq_client_notify_subscription(int client, int port,
1419 struct snd_seq_port_subscribe *info,
1420 int evtype)
1421 {
1422 struct snd_seq_event event;
1423
1424 memset(&event, 0, sizeof(event));
1425 event.type = evtype;
1426 event.data.connect.dest = info->dest;
1427 event.data.connect.sender = info->sender;
1428
1429 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1430 }
1431
1432
1433 /*
1434 * add to port's subscription list IOCTL interface
1435 */
1436 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1437 void *arg)
1438 {
1439 struct snd_seq_port_subscribe *subs = arg;
1440 int result = -EINVAL;
1441 struct snd_seq_client *receiver = NULL, *sender = NULL;
1442 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1443
1444 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1445 goto __end;
1446 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1447 goto __end;
1448 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1449 goto __end;
1450 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1451 goto __end;
1452
1453 result = check_subscription_permission(client, sport, dport, subs);
1454 if (result < 0)
1455 goto __end;
1456
1457 /* connect them */
1458 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1459 if (! result) /* broadcast announce */
1460 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1461 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1462 __end:
1463 if (sport)
1464 snd_seq_port_unlock(sport);
1465 if (dport)
1466 snd_seq_port_unlock(dport);
1467 if (sender)
1468 snd_seq_client_unlock(sender);
1469 if (receiver)
1470 snd_seq_client_unlock(receiver);
1471 return result;
1472 }
1473
1474
1475 /*
1476 * remove from port's subscription list
1477 */
1478 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1479 void *arg)
1480 {
1481 struct snd_seq_port_subscribe *subs = arg;
1482 int result = -ENXIO;
1483 struct snd_seq_client *receiver = NULL, *sender = NULL;
1484 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1485
1486 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1487 goto __end;
1488 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1489 goto __end;
1490 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1491 goto __end;
1492 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1493 goto __end;
1494
1495 result = check_subscription_permission(client, sport, dport, subs);
1496 if (result < 0)
1497 goto __end;
1498
1499 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1500 if (! result) /* broadcast announce */
1501 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1502 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1503 __end:
1504 if (sport)
1505 snd_seq_port_unlock(sport);
1506 if (dport)
1507 snd_seq_port_unlock(dport);
1508 if (sender)
1509 snd_seq_client_unlock(sender);
1510 if (receiver)
1511 snd_seq_client_unlock(receiver);
1512 return result;
1513 }
1514
1515
1516 /* CREATE_QUEUE ioctl() */
1517 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1518 {
1519 struct snd_seq_queue_info *info = arg;
1520 struct snd_seq_queue *q;
1521
1522 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1523 if (IS_ERR(q))
1524 return PTR_ERR(q);
1525
1526 info->queue = q->queue;
1527 info->locked = q->locked;
1528 info->owner = q->owner;
1529
1530 /* set queue name */
1531 if (!info->name[0])
1532 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1533 strscpy(q->name, info->name, sizeof(q->name));
1534 snd_use_lock_free(&q->use_lock);
1535
1536 return 0;
1537 }
1538
1539 /* DELETE_QUEUE ioctl() */
1540 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1541 {
1542 struct snd_seq_queue_info *info = arg;
1543
1544 return snd_seq_queue_delete(client->number, info->queue);
1545 }
1546
1547 /* GET_QUEUE_INFO ioctl() */
1548 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1549 void *arg)
1550 {
1551 struct snd_seq_queue_info *info = arg;
1552 struct snd_seq_queue *q;
1553
1554 q = queueptr(info->queue);
1555 if (q == NULL)
1556 return -EINVAL;
1557
1558 memset(info, 0, sizeof(*info));
1559 info->queue = q->queue;
1560 info->owner = q->owner;
1561 info->locked = q->locked;
1562 strlcpy(info->name, q->name, sizeof(info->name));
1563 queuefree(q);
1564
1565 return 0;
1566 }
1567
1568 /* SET_QUEUE_INFO ioctl() */
1569 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1570 void *arg)
1571 {
1572 struct snd_seq_queue_info *info = arg;
1573 struct snd_seq_queue *q;
1574
1575 if (info->owner != client->number)
1576 return -EINVAL;
1577
1578 /* change owner/locked permission */
1579 if (snd_seq_queue_check_access(info->queue, client->number)) {
1580 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1581 return -EPERM;
1582 if (info->locked)
1583 snd_seq_queue_use(info->queue, client->number, 1);
1584 } else {
1585 return -EPERM;
1586 }
1587
1588 q = queueptr(info->queue);
1589 if (! q)
1590 return -EINVAL;
1591 if (q->owner != client->number) {
1592 queuefree(q);
1593 return -EPERM;
1594 }
1595 strscpy(q->name, info->name, sizeof(q->name));
1596 queuefree(q);
1597
1598 return 0;
1599 }
1600
1601 /* GET_NAMED_QUEUE ioctl() */
1602 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1603 void *arg)
1604 {
1605 struct snd_seq_queue_info *info = arg;
1606 struct snd_seq_queue *q;
1607
1608 q = snd_seq_queue_find_name(info->name);
1609 if (q == NULL)
1610 return -EINVAL;
1611 info->queue = q->queue;
1612 info->owner = q->owner;
1613 info->locked = q->locked;
1614 queuefree(q);
1615
1616 return 0;
1617 }
1618
1619 /* GET_QUEUE_STATUS ioctl() */
1620 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1621 void *arg)
1622 {
1623 struct snd_seq_queue_status *status = arg;
1624 struct snd_seq_queue *queue;
1625 struct snd_seq_timer *tmr;
1626
1627 queue = queueptr(status->queue);
1628 if (queue == NULL)
1629 return -EINVAL;
1630 memset(status, 0, sizeof(*status));
1631 status->queue = queue->queue;
1632
1633 tmr = queue->timer;
1634 status->events = queue->tickq->cells + queue->timeq->cells;
1635
1636 status->time = snd_seq_timer_get_cur_time(tmr);
1637 status->tick = snd_seq_timer_get_cur_tick(tmr);
1638
1639 status->running = tmr->running;
1640
1641 status->flags = queue->flags;
1642 queuefree(queue);
1643
1644 return 0;
1645 }
1646
1647
1648 /* GET_QUEUE_TEMPO ioctl() */
1649 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1650 void *arg)
1651 {
1652 struct snd_seq_queue_tempo *tempo = arg;
1653 struct snd_seq_queue *queue;
1654 struct snd_seq_timer *tmr;
1655
1656 queue = queueptr(tempo->queue);
1657 if (queue == NULL)
1658 return -EINVAL;
1659 memset(tempo, 0, sizeof(*tempo));
1660 tempo->queue = queue->queue;
1661
1662 tmr = queue->timer;
1663
1664 tempo->tempo = tmr->tempo;
1665 tempo->ppq = tmr->ppq;
1666 tempo->skew_value = tmr->skew;
1667 tempo->skew_base = tmr->skew_base;
1668 queuefree(queue);
1669
1670 return 0;
1671 }
1672
1673
1674 /* SET_QUEUE_TEMPO ioctl() */
1675 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1676 {
1677 if (!snd_seq_queue_check_access(tempo->queue, client))
1678 return -EPERM;
1679 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1680 }
1681 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1682
1683 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1684 void *arg)
1685 {
1686 struct snd_seq_queue_tempo *tempo = arg;
1687 int result;
1688
1689 result = snd_seq_set_queue_tempo(client->number, tempo);
1690 return result < 0 ? result : 0;
1691 }
1692
1693
1694 /* GET_QUEUE_TIMER ioctl() */
1695 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1696 void *arg)
1697 {
1698 struct snd_seq_queue_timer *timer = arg;
1699 struct snd_seq_queue *queue;
1700 struct snd_seq_timer *tmr;
1701
1702 queue = queueptr(timer->queue);
1703 if (queue == NULL)
1704 return -EINVAL;
1705
1706 mutex_lock(&queue->timer_mutex);
1707 tmr = queue->timer;
1708 memset(timer, 0, sizeof(*timer));
1709 timer->queue = queue->queue;
1710
1711 timer->type = tmr->type;
1712 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1713 timer->u.alsa.id = tmr->alsa_id;
1714 timer->u.alsa.resolution = tmr->preferred_resolution;
1715 }
1716 mutex_unlock(&queue->timer_mutex);
1717 queuefree(queue);
1718
1719 return 0;
1720 }
1721
1722
1723 /* SET_QUEUE_TIMER ioctl() */
1724 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1725 void *arg)
1726 {
1727 struct snd_seq_queue_timer *timer = arg;
1728 int result = 0;
1729
1730 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1731 return -EINVAL;
1732
1733 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1734 struct snd_seq_queue *q;
1735 struct snd_seq_timer *tmr;
1736
1737 q = queueptr(timer->queue);
1738 if (q == NULL)
1739 return -ENXIO;
1740 mutex_lock(&q->timer_mutex);
1741 tmr = q->timer;
1742 snd_seq_queue_timer_close(timer->queue);
1743 tmr->type = timer->type;
1744 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1745 tmr->alsa_id = timer->u.alsa.id;
1746 tmr->preferred_resolution = timer->u.alsa.resolution;
1747 }
1748 result = snd_seq_queue_timer_open(timer->queue);
1749 mutex_unlock(&q->timer_mutex);
1750 queuefree(q);
1751 } else {
1752 return -EPERM;
1753 }
1754
1755 return result;
1756 }
1757
1758
1759 /* GET_QUEUE_CLIENT ioctl() */
1760 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1761 void *arg)
1762 {
1763 struct snd_seq_queue_client *info = arg;
1764 int used;
1765
1766 used = snd_seq_queue_is_used(info->queue, client->number);
1767 if (used < 0)
1768 return -EINVAL;
1769 info->used = used;
1770 info->client = client->number;
1771
1772 return 0;
1773 }
1774
1775
1776 /* SET_QUEUE_CLIENT ioctl() */
1777 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1778 void *arg)
1779 {
1780 struct snd_seq_queue_client *info = arg;
1781 int err;
1782
1783 if (info->used >= 0) {
1784 err = snd_seq_queue_use(info->queue, client->number, info->used);
1785 if (err < 0)
1786 return err;
1787 }
1788
1789 return snd_seq_ioctl_get_queue_client(client, arg);
1790 }
1791
1792
1793 /* GET_CLIENT_POOL ioctl() */
1794 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1795 void *arg)
1796 {
1797 struct snd_seq_client_pool *info = arg;
1798 struct snd_seq_client *cptr;
1799
1800 cptr = snd_seq_client_use_ptr(info->client);
1801 if (cptr == NULL)
1802 return -ENOENT;
1803 memset(info, 0, sizeof(*info));
1804 info->client = cptr->number;
1805 info->output_pool = cptr->pool->size;
1806 info->output_room = cptr->pool->room;
1807 info->output_free = info->output_pool;
1808 info->output_free = snd_seq_unused_cells(cptr->pool);
1809 if (cptr->type == USER_CLIENT) {
1810 info->input_pool = cptr->data.user.fifo_pool_size;
1811 info->input_free = info->input_pool;
1812 if (cptr->data.user.fifo)
1813 info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1814 } else {
1815 info->input_pool = 0;
1816 info->input_free = 0;
1817 }
1818 snd_seq_client_unlock(cptr);
1819
1820 return 0;
1821 }
1822
1823 /* SET_CLIENT_POOL ioctl() */
1824 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1825 void *arg)
1826 {
1827 struct snd_seq_client_pool *info = arg;
1828 int rc;
1829
1830 if (client->number != info->client)
1831 return -EINVAL; /* can't change other clients */
1832
1833 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1834 (! snd_seq_write_pool_allocated(client) ||
1835 info->output_pool != client->pool->size)) {
1836 if (snd_seq_write_pool_allocated(client)) {
1837 /* is the pool in use? */
1838 if (atomic_read(&client->pool->counter))
1839 return -EBUSY;
1840 /* remove all existing cells */
1841 snd_seq_pool_mark_closing(client->pool);
1842 snd_seq_pool_done(client->pool);
1843 }
1844 client->pool->size = info->output_pool;
1845 rc = snd_seq_pool_init(client->pool);
1846 if (rc < 0)
1847 return rc;
1848 }
1849 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1850 info->input_pool >= 1 &&
1851 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1852 info->input_pool != client->data.user.fifo_pool_size) {
1853 /* change pool size */
1854 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1855 if (rc < 0)
1856 return rc;
1857 client->data.user.fifo_pool_size = info->input_pool;
1858 }
1859 if (info->output_room >= 1 &&
1860 info->output_room <= client->pool->size) {
1861 client->pool->room = info->output_room;
1862 }
1863
1864 return snd_seq_ioctl_get_client_pool(client, arg);
1865 }
1866
1867
1868 /* REMOVE_EVENTS ioctl() */
1869 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1870 void *arg)
1871 {
1872 struct snd_seq_remove_events *info = arg;
1873
1874 /*
1875 * Input mostly not implemented XXX.
1876 */
1877 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1878 /*
1879 * No restrictions so for a user client we can clear
1880 * the whole fifo
1881 */
1882 if (client->type == USER_CLIENT && client->data.user.fifo)
1883 snd_seq_fifo_clear(client->data.user.fifo);
1884 }
1885
1886 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1887 snd_seq_queue_remove_cells(client->number, info);
1888
1889 return 0;
1890 }
1891
1892
1893 /*
1894 * get subscription info
1895 */
1896 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1897 void *arg)
1898 {
1899 struct snd_seq_port_subscribe *subs = arg;
1900 int result;
1901 struct snd_seq_client *sender = NULL;
1902 struct snd_seq_client_port *sport = NULL;
1903 struct snd_seq_subscribers *p;
1904
1905 result = -EINVAL;
1906 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1907 goto __end;
1908 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1909 goto __end;
1910 p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1911 if (p) {
1912 result = 0;
1913 *subs = p->info;
1914 } else
1915 result = -ENOENT;
1916
1917 __end:
1918 if (sport)
1919 snd_seq_port_unlock(sport);
1920 if (sender)
1921 snd_seq_client_unlock(sender);
1922
1923 return result;
1924 }
1925
1926
1927 /*
1928 * get subscription info - check only its presence
1929 */
1930 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1931 {
1932 struct snd_seq_query_subs *subs = arg;
1933 int result = -ENXIO;
1934 struct snd_seq_client *cptr = NULL;
1935 struct snd_seq_client_port *port = NULL;
1936 struct snd_seq_port_subs_info *group;
1937 struct list_head *p;
1938 int i;
1939
1940 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1941 goto __end;
1942 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1943 goto __end;
1944
1945 switch (subs->type) {
1946 case SNDRV_SEQ_QUERY_SUBS_READ:
1947 group = &port->c_src;
1948 break;
1949 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1950 group = &port->c_dest;
1951 break;
1952 default:
1953 goto __end;
1954 }
1955
1956 down_read(&group->list_mutex);
1957 /* search for the subscriber */
1958 subs->num_subs = group->count;
1959 i = 0;
1960 result = -ENOENT;
1961 list_for_each(p, &group->list_head) {
1962 if (i++ == subs->index) {
1963 /* found! */
1964 struct snd_seq_subscribers *s;
1965 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1966 s = list_entry(p, struct snd_seq_subscribers, src_list);
1967 subs->addr = s->info.dest;
1968 } else {
1969 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1970 subs->addr = s->info.sender;
1971 }
1972 subs->flags = s->info.flags;
1973 subs->queue = s->info.queue;
1974 result = 0;
1975 break;
1976 }
1977 }
1978 up_read(&group->list_mutex);
1979
1980 __end:
1981 if (port)
1982 snd_seq_port_unlock(port);
1983 if (cptr)
1984 snd_seq_client_unlock(cptr);
1985
1986 return result;
1987 }
1988
1989
1990 /*
1991 * query next client
1992 */
1993 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1994 void *arg)
1995 {
1996 struct snd_seq_client_info *info = arg;
1997 struct snd_seq_client *cptr = NULL;
1998
1999 /* search for next client */
2000 if (info->client < INT_MAX)
2001 info->client++;
2002 if (info->client < 0)
2003 info->client = 0;
2004 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2005 cptr = snd_seq_client_use_ptr(info->client);
2006 if (cptr)
2007 break; /* found */
2008 }
2009 if (cptr == NULL)
2010 return -ENOENT;
2011
2012 get_client_info(cptr, info);
2013 snd_seq_client_unlock(cptr);
2014
2015 return 0;
2016 }
2017
2018 /*
2019 * query next port
2020 */
2021 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2022 void *arg)
2023 {
2024 struct snd_seq_port_info *info = arg;
2025 struct snd_seq_client *cptr;
2026 struct snd_seq_client_port *port = NULL;
2027
2028 cptr = snd_seq_client_use_ptr(info->addr.client);
2029 if (cptr == NULL)
2030 return -ENXIO;
2031
2032 /* search for next port */
2033 info->addr.port++;
2034 port = snd_seq_port_query_nearest(cptr, info);
2035 if (port == NULL) {
2036 snd_seq_client_unlock(cptr);
2037 return -ENOENT;
2038 }
2039
2040 /* get port info */
2041 info->addr = port->addr;
2042 snd_seq_get_port_info(port, info);
2043 snd_seq_port_unlock(port);
2044 snd_seq_client_unlock(cptr);
2045
2046 return 0;
2047 }
2048
2049 /* -------------------------------------------------------- */
2050
2051 static const struct ioctl_handler {
2052 unsigned int cmd;
2053 int (*func)(struct snd_seq_client *client, void *arg);
2054 } ioctl_handlers[] = {
2055 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2056 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2057 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2058 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2059 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2060 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2061 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2062 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2063 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2064 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2065 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2066 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2067 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2068 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2069 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2070 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2071 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2072 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2073 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2074 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2075 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2076 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2077 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2078 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2079 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2080 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2081 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2082 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2083 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2084 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2085 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2086 { 0, NULL },
2087 };
2088
2089 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2090 unsigned long arg)
2091 {
2092 struct snd_seq_client *client = file->private_data;
2093 /* To use kernel stack for ioctl data. */
2094 union {
2095 int pversion;
2096 int client_id;
2097 struct snd_seq_system_info system_info;
2098 struct snd_seq_running_info running_info;
2099 struct snd_seq_client_info client_info;
2100 struct snd_seq_port_info port_info;
2101 struct snd_seq_port_subscribe port_subscribe;
2102 struct snd_seq_queue_info queue_info;
2103 struct snd_seq_queue_status queue_status;
2104 struct snd_seq_queue_tempo tempo;
2105 struct snd_seq_queue_timer queue_timer;
2106 struct snd_seq_queue_client queue_client;
2107 struct snd_seq_client_pool client_pool;
2108 struct snd_seq_remove_events remove_events;
2109 struct snd_seq_query_subs query_subs;
2110 } buf;
2111 const struct ioctl_handler *handler;
2112 unsigned long size;
2113 int err;
2114
2115 if (snd_BUG_ON(!client))
2116 return -ENXIO;
2117
2118 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2119 if (handler->cmd == cmd)
2120 break;
2121 }
2122 if (handler->cmd == 0)
2123 return -ENOTTY;
2124
2125 memset(&buf, 0, sizeof(buf));
2126
2127 /*
2128 * All of ioctl commands for ALSA sequencer get an argument of size
2129 * within 13 bits. We can safely pick up the size from the command.
2130 */
2131 size = _IOC_SIZE(handler->cmd);
2132 if (handler->cmd & IOC_IN) {
2133 if (copy_from_user(&buf, (const void __user *)arg, size))
2134 return -EFAULT;
2135 }
2136
2137 mutex_lock(&client->ioctl_mutex);
2138 err = handler->func(client, &buf);
2139 mutex_unlock(&client->ioctl_mutex);
2140 if (err >= 0) {
2141 /* Some commands includes a bug in 'dir' field. */
2142 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2143 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2144 (handler->cmd & IOC_OUT))
2145 if (copy_to_user((void __user *)arg, &buf, size))
2146 return -EFAULT;
2147 }
2148
2149 return err;
2150 }
2151
2152 #ifdef CONFIG_COMPAT
2153 #include "seq_compat.c"
2154 #else
2155 #define snd_seq_ioctl_compat NULL
2156 #endif
2157
2158 /* -------------------------------------------------------- */
2159
2160
2161 /* exported to kernel modules */
2162 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2163 const char *name_fmt, ...)
2164 {
2165 struct snd_seq_client *client;
2166 va_list args;
2167
2168 if (snd_BUG_ON(in_interrupt()))
2169 return -EBUSY;
2170
2171 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2172 return -EINVAL;
2173 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2174 return -EINVAL;
2175
2176 mutex_lock(&register_mutex);
2177
2178 if (card) {
2179 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2180 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2181 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2182 client_index = -1;
2183 }
2184
2185 /* empty write queue as default */
2186 client = seq_create_client1(client_index, 0);
2187 if (client == NULL) {
2188 mutex_unlock(&register_mutex);
2189 return -EBUSY; /* failure code */
2190 }
2191 usage_alloc(&client_usage, 1);
2192
2193 client->accept_input = 1;
2194 client->accept_output = 1;
2195 client->data.kernel.card = card;
2196
2197 va_start(args, name_fmt);
2198 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2199 va_end(args);
2200
2201 client->type = KERNEL_CLIENT;
2202 mutex_unlock(&register_mutex);
2203
2204 /* make others aware this new client */
2205 snd_seq_system_client_ev_client_start(client->number);
2206
2207 /* return client number to caller */
2208 return client->number;
2209 }
2210 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2211
2212 /* exported to kernel modules */
2213 int snd_seq_delete_kernel_client(int client)
2214 {
2215 struct snd_seq_client *ptr;
2216
2217 if (snd_BUG_ON(in_interrupt()))
2218 return -EBUSY;
2219
2220 ptr = clientptr(client);
2221 if (ptr == NULL)
2222 return -EINVAL;
2223
2224 seq_free_client(ptr);
2225 kfree(ptr);
2226 return 0;
2227 }
2228 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2229
2230 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2231 * and snd_seq_kernel_client_enqueue_blocking
2232 */
2233 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2234 struct file *file, int blocking,
2235 int atomic, int hop)
2236 {
2237 struct snd_seq_client *cptr;
2238 int result;
2239
2240 if (snd_BUG_ON(!ev))
2241 return -EINVAL;
2242
2243 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2244 return 0; /* ignore this */
2245 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2246 return -EINVAL; /* quoted events can't be enqueued */
2247
2248 /* fill in client number */
2249 ev->source.client = client;
2250
2251 if (check_event_type_and_length(ev))
2252 return -EINVAL;
2253
2254 cptr = snd_seq_client_use_ptr(client);
2255 if (cptr == NULL)
2256 return -EINVAL;
2257
2258 if (! cptr->accept_output)
2259 result = -EPERM;
2260 else /* send it */
2261 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2262 atomic, hop, NULL);
2263
2264 snd_seq_client_unlock(cptr);
2265 return result;
2266 }
2267
2268 /*
2269 * exported, called by kernel clients to enqueue events (w/o blocking)
2270 *
2271 * RETURN VALUE: zero if succeed, negative if error
2272 */
2273 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2274 int atomic, int hop)
2275 {
2276 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2277 }
2278 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2279
2280 /*
2281 * exported, called by kernel clients to enqueue events (with blocking)
2282 *
2283 * RETURN VALUE: zero if succeed, negative if error
2284 */
2285 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2286 struct file *file,
2287 int atomic, int hop)
2288 {
2289 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2290 }
2291 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2292
2293 /*
2294 * exported, called by kernel clients to dispatch events directly to other
2295 * clients, bypassing the queues. Event time-stamp will be updated.
2296 *
2297 * RETURN VALUE: negative = delivery failed,
2298 * zero, or positive: the number of delivered events
2299 */
2300 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2301 int atomic, int hop)
2302 {
2303 struct snd_seq_client *cptr;
2304 int result;
2305
2306 if (snd_BUG_ON(!ev))
2307 return -EINVAL;
2308
2309 /* fill in client number */
2310 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2311 ev->source.client = client;
2312
2313 if (check_event_type_and_length(ev))
2314 return -EINVAL;
2315
2316 cptr = snd_seq_client_use_ptr(client);
2317 if (cptr == NULL)
2318 return -EINVAL;
2319
2320 if (!cptr->accept_output)
2321 result = -EPERM;
2322 else
2323 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2324
2325 snd_seq_client_unlock(cptr);
2326 return result;
2327 }
2328 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2329
2330 /**
2331 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2332 * kernel space.
2333 * @clientid: A numerical ID for a client.
2334 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2335 * @arg: A pointer to data in kernel space.
2336 *
2337 * Against its name, both kernel/application client can be handled by this
2338 * kernel API. A pointer of 'arg' argument should be in kernel space.
2339 *
2340 * Return: 0 at success. Negative error code at failure.
2341 */
2342 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2343 {
2344 const struct ioctl_handler *handler;
2345 struct snd_seq_client *client;
2346
2347 client = clientptr(clientid);
2348 if (client == NULL)
2349 return -ENXIO;
2350
2351 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2352 if (handler->cmd == cmd)
2353 return handler->func(client, arg);
2354 }
2355
2356 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2357 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2358 return -ENOTTY;
2359 }
2360 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2361
2362 /* exported (for OSS emulator) */
2363 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2364 {
2365 struct snd_seq_client *client;
2366
2367 client = clientptr(clientid);
2368 if (client == NULL)
2369 return -ENXIO;
2370
2371 if (! snd_seq_write_pool_allocated(client))
2372 return 1;
2373 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2374 return 1;
2375 return 0;
2376 }
2377 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2378
2379 /*---------------------------------------------------------------------------*/
2380
2381 #ifdef CONFIG_SND_PROC_FS
2382 /*
2383 * /proc interface
2384 */
2385 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2386 struct snd_seq_port_subs_info *group,
2387 int is_src, char *msg)
2388 {
2389 struct list_head *p;
2390 struct snd_seq_subscribers *s;
2391 int count = 0;
2392
2393 down_read(&group->list_mutex);
2394 if (list_empty(&group->list_head)) {
2395 up_read(&group->list_mutex);
2396 return;
2397 }
2398 snd_iprintf(buffer, msg);
2399 list_for_each(p, &group->list_head) {
2400 if (is_src)
2401 s = list_entry(p, struct snd_seq_subscribers, src_list);
2402 else
2403 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2404 if (count++)
2405 snd_iprintf(buffer, ", ");
2406 snd_iprintf(buffer, "%d:%d",
2407 is_src ? s->info.dest.client : s->info.sender.client,
2408 is_src ? s->info.dest.port : s->info.sender.port);
2409 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2410 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2411 if (group->exclusive)
2412 snd_iprintf(buffer, "[ex]");
2413 }
2414 up_read(&group->list_mutex);
2415 snd_iprintf(buffer, "\n");
2416 }
2417
2418 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2419 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2420 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2421
2422 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2423
2424 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2425 struct snd_seq_client *client)
2426 {
2427 struct snd_seq_client_port *p;
2428
2429 mutex_lock(&client->ports_mutex);
2430 list_for_each_entry(p, &client->ports_list_head, list) {
2431 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2432 p->addr.port, p->name,
2433 FLAG_PERM_RD(p->capability),
2434 FLAG_PERM_WR(p->capability),
2435 FLAG_PERM_EX(p->capability),
2436 FLAG_PERM_DUPLEX(p->capability));
2437 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2438 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2439 }
2440 mutex_unlock(&client->ports_mutex);
2441 }
2442
2443
2444 /* exported to seq_info.c */
2445 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2446 struct snd_info_buffer *buffer)
2447 {
2448 int c;
2449 struct snd_seq_client *client;
2450
2451 snd_iprintf(buffer, "Client info\n");
2452 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2453 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2454 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2455 snd_iprintf(buffer, "\n");
2456
2457 /* list the client table */
2458 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2459 client = snd_seq_client_use_ptr(c);
2460 if (client == NULL)
2461 continue;
2462 if (client->type == NO_CLIENT) {
2463 snd_seq_client_unlock(client);
2464 continue;
2465 }
2466
2467 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2468 c, client->name,
2469 client->type == USER_CLIENT ? "User" : "Kernel");
2470 snd_seq_info_dump_ports(buffer, client);
2471 if (snd_seq_write_pool_allocated(client)) {
2472 snd_iprintf(buffer, " Output pool :\n");
2473 snd_seq_info_pool(buffer, client->pool, " ");
2474 }
2475 if (client->type == USER_CLIENT && client->data.user.fifo &&
2476 client->data.user.fifo->pool) {
2477 snd_iprintf(buffer, " Input pool :\n");
2478 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2479 }
2480 snd_seq_client_unlock(client);
2481 }
2482 }
2483 #endif /* CONFIG_SND_PROC_FS */
2484
2485 /*---------------------------------------------------------------------------*/
2486
2487
2488 /*
2489 * REGISTRATION PART
2490 */
2491
2492 static const struct file_operations snd_seq_f_ops =
2493 {
2494 .owner = THIS_MODULE,
2495 .read = snd_seq_read,
2496 .write = snd_seq_write,
2497 .open = snd_seq_open,
2498 .release = snd_seq_release,
2499 .llseek = no_llseek,
2500 .poll = snd_seq_poll,
2501 .unlocked_ioctl = snd_seq_ioctl,
2502 .compat_ioctl = snd_seq_ioctl_compat,
2503 };
2504
2505 static struct device seq_dev;
2506
2507 /*
2508 * register sequencer device
2509 */
2510 int __init snd_sequencer_device_init(void)
2511 {
2512 int err;
2513
2514 snd_device_initialize(&seq_dev, NULL);
2515 dev_set_name(&seq_dev, "seq");
2516
2517 mutex_lock(&register_mutex);
2518 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2519 &snd_seq_f_ops, NULL, &seq_dev);
2520 mutex_unlock(&register_mutex);
2521 if (err < 0) {
2522 put_device(&seq_dev);
2523 return err;
2524 }
2525
2526 return 0;
2527 }
2528
2529
2530
2531 /*
2532 * unregister sequencer device
2533 */
2534 void snd_sequencer_device_done(void)
2535 {
2536 snd_unregister_device(&seq_dev);
2537 put_device(&seq_dev);
2538 }
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