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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / sound / core / seq / seq_clientmgr.c
blob4dc6bae80e15b92a005325f845f0cc16fcd67ce0
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
91 static inline mm_segment_t snd_enter_user(void)
92 {
93 mm_segment_t fs = get_fs();
94 set_fs(get_ds());
95 return fs;
96 }
97
98 static inline void snd_leave_user(mm_segment_t fs)
99 {
100 set_fs(fs);
101 }
102
103 /*
104 */
105 static inline unsigned short snd_seq_file_flags(struct file *file)
106 {
107 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
108 case FMODE_WRITE:
109 return SNDRV_SEQ_LFLG_OUTPUT;
110 case FMODE_READ:
111 return SNDRV_SEQ_LFLG_INPUT;
112 default:
113 return SNDRV_SEQ_LFLG_OPEN;
114 }
115 }
116
117 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
118 {
119 return snd_seq_total_cells(client->pool) > 0;
120 }
121
122 /* return pointer to client structure for specified id */
123 static struct snd_seq_client *clientptr(int clientid)
124 {
125 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
126 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
127 clientid);
128 return NULL;
129 }
130 return clienttab[clientid];
131 }
132
133 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
134 {
135 unsigned long flags;
136 struct snd_seq_client *client;
137
138 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
139 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
140 clientid);
141 return NULL;
142 }
143 spin_lock_irqsave(&clients_lock, flags);
144 client = clientptr(clientid);
145 if (client)
146 goto __lock;
147 if (clienttablock[clientid]) {
148 spin_unlock_irqrestore(&clients_lock, flags);
149 return NULL;
150 }
151 spin_unlock_irqrestore(&clients_lock, flags);
152 #ifdef CONFIG_MODULES
153 if (!in_interrupt()) {
154 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
155 static char card_requested[SNDRV_CARDS];
156 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
157 int idx;
158
159 if (!client_requested[clientid]) {
160 client_requested[clientid] = 1;
161 for (idx = 0; idx < 15; idx++) {
162 if (seq_client_load[idx] < 0)
163 break;
164 if (seq_client_load[idx] == clientid) {
165 request_module("snd-seq-client-%i",
166 clientid);
167 break;
168 }
169 }
170 }
171 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
172 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
173 SNDRV_SEQ_CLIENTS_PER_CARD;
174 if (card < snd_ecards_limit) {
175 if (! card_requested[card]) {
176 card_requested[card] = 1;
177 snd_request_card(card);
178 }
179 snd_seq_device_load_drivers();
180 }
181 }
182 spin_lock_irqsave(&clients_lock, flags);
183 client = clientptr(clientid);
184 if (client)
185 goto __lock;
186 spin_unlock_irqrestore(&clients_lock, flags);
187 }
188 #endif
189 return NULL;
190
191 __lock:
192 snd_use_lock_use(&client->use_lock);
193 spin_unlock_irqrestore(&clients_lock, flags);
194 return client;
195 }
196
197 static void usage_alloc(struct snd_seq_usage *res, int num)
198 {
199 res->cur += num;
200 if (res->cur > res->peak)
201 res->peak = res->cur;
202 }
203
204 static void usage_free(struct snd_seq_usage *res, int num)
205 {
206 res->cur -= num;
207 }
208
209 /* initialise data structures */
210 int __init client_init_data(void)
211 {
212 /* zap out the client table */
213 memset(&clienttablock, 0, sizeof(clienttablock));
214 memset(&clienttab, 0, sizeof(clienttab));
215 return 0;
216 }
217
218
219 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
220 {
221 unsigned long flags;
222 int c;
223 struct snd_seq_client *client;
224
225 /* init client data */
226 client = kzalloc(sizeof(*client), GFP_KERNEL);
227 if (client == NULL)
228 return NULL;
229 client->pool = snd_seq_pool_new(poolsize);
230 if (client->pool == NULL) {
231 kfree(client);
232 return NULL;
233 }
234 client->type = NO_CLIENT;
235 snd_use_lock_init(&client->use_lock);
236 rwlock_init(&client->ports_lock);
237 mutex_init(&client->ports_mutex);
238 INIT_LIST_HEAD(&client->ports_list_head);
239
240 /* find free slot in the client table */
241 spin_lock_irqsave(&clients_lock, flags);
242 if (client_index < 0) {
243 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
244 c < SNDRV_SEQ_MAX_CLIENTS;
245 c++) {
246 if (clienttab[c] || clienttablock[c])
247 continue;
248 clienttab[client->number = c] = client;
249 spin_unlock_irqrestore(&clients_lock, flags);
250 return client;
251 }
252 } else {
253 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
254 clienttab[client->number = client_index] = client;
255 spin_unlock_irqrestore(&clients_lock, flags);
256 return client;
257 }
258 }
259 spin_unlock_irqrestore(&clients_lock, flags);
260 snd_seq_pool_delete(&client->pool);
261 kfree(client);
262 return NULL; /* no free slot found or busy, return failure code */
263 }
264
265
266 static int seq_free_client1(struct snd_seq_client *client)
267 {
268 unsigned long flags;
269
270 if (!client)
271 return 0;
272 snd_seq_delete_all_ports(client);
273 snd_seq_queue_client_leave(client->number);
274 spin_lock_irqsave(&clients_lock, flags);
275 clienttablock[client->number] = 1;
276 clienttab[client->number] = NULL;
277 spin_unlock_irqrestore(&clients_lock, flags);
278 snd_use_lock_sync(&client->use_lock);
279 snd_seq_queue_client_termination(client->number);
280 if (client->pool)
281 snd_seq_pool_delete(&client->pool);
282 spin_lock_irqsave(&clients_lock, flags);
283 clienttablock[client->number] = 0;
284 spin_unlock_irqrestore(&clients_lock, flags);
285 return 0;
286 }
287
288
289 static void seq_free_client(struct snd_seq_client * client)
290 {
291 mutex_lock(&register_mutex);
292 switch (client->type) {
293 case NO_CLIENT:
294 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
295 client->number);
296 break;
297 case USER_CLIENT:
298 case KERNEL_CLIENT:
299 seq_free_client1(client);
300 usage_free(&client_usage, 1);
301 break;
302
303 default:
304 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
305 client->number, client->type);
306 }
307 mutex_unlock(&register_mutex);
308
309 snd_seq_system_client_ev_client_exit(client->number);
310 }
311
312
313
314 /* -------------------------------------------------------- */
315
316 /* create a user client */
317 static int snd_seq_open(struct inode *inode, struct file *file)
318 {
319 int c, mode; /* client id */
320 struct snd_seq_client *client;
321 struct snd_seq_user_client *user;
322 int err;
323
324 err = nonseekable_open(inode, file);
325 if (err < 0)
326 return err;
327
328 if (mutex_lock_interruptible(&register_mutex))
329 return -ERESTARTSYS;
330 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
331 if (client == NULL) {
332 mutex_unlock(&register_mutex);
333 return -ENOMEM; /* failure code */
334 }
335
336 mode = snd_seq_file_flags(file);
337 if (mode & SNDRV_SEQ_LFLG_INPUT)
338 client->accept_input = 1;
339 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
340 client->accept_output = 1;
341
342 user = &client->data.user;
343 user->fifo = NULL;
344 user->fifo_pool_size = 0;
345
346 if (mode & SNDRV_SEQ_LFLG_INPUT) {
347 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
348 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
349 if (user->fifo == NULL) {
350 seq_free_client1(client);
351 kfree(client);
352 mutex_unlock(&register_mutex);
353 return -ENOMEM;
354 }
355 }
356
357 usage_alloc(&client_usage, 1);
358 client->type = USER_CLIENT;
359 mutex_unlock(&register_mutex);
360
361 c = client->number;
362 file->private_data = client;
363
364 /* fill client data */
365 user->file = file;
366 sprintf(client->name, "Client-%d", c);
367
368 /* make others aware this new client */
369 snd_seq_system_client_ev_client_start(c);
370
371 return 0;
372 }
373
374 /* delete a user client */
375 static int snd_seq_release(struct inode *inode, struct file *file)
376 {
377 struct snd_seq_client *client = file->private_data;
378
379 if (client) {
380 seq_free_client(client);
381 if (client->data.user.fifo)
382 snd_seq_fifo_delete(&client->data.user.fifo);
383 kfree(client);
384 }
385
386 return 0;
387 }
388
389
390 /* handle client read() */
391 /* possible error values:
392 * -ENXIO invalid client or file open mode
393 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
394 * -EINVAL no enough user-space buffer to write the whole event
395 * -EFAULT seg. fault during copy to user space
396 */
397 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
398 loff_t *offset)
399 {
400 struct snd_seq_client *client = file->private_data;
401 struct snd_seq_fifo *fifo;
402 int err;
403 long result = 0;
404 struct snd_seq_event_cell *cell;
405
406 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
407 return -ENXIO;
408
409 if (!access_ok(VERIFY_WRITE, buf, count))
410 return -EFAULT;
411
412 /* check client structures are in place */
413 if (snd_BUG_ON(!client))
414 return -ENXIO;
415
416 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
417 return -ENXIO;
418
419 if (atomic_read(&fifo->overflow) > 0) {
420 /* buffer overflow is detected */
421 snd_seq_fifo_clear(fifo);
422 /* return error code */
423 return -ENOSPC;
424 }
425
426 cell = NULL;
427 err = 0;
428 snd_seq_fifo_lock(fifo);
429
430 /* while data available in queue */
431 while (count >= sizeof(struct snd_seq_event)) {
432 int nonblock;
433
434 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
435 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
436 break;
437 }
438 if (snd_seq_ev_is_variable(&cell->event)) {
439 struct snd_seq_event tmpev;
440 tmpev = cell->event;
441 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
442 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
443 err = -EFAULT;
444 break;
445 }
446 count -= sizeof(struct snd_seq_event);
447 buf += sizeof(struct snd_seq_event);
448 err = snd_seq_expand_var_event(&cell->event, count,
449 (char __force *)buf, 0,
450 sizeof(struct snd_seq_event));
451 if (err < 0)
452 break;
453 result += err;
454 count -= err;
455 buf += err;
456 } else {
457 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
458 err = -EFAULT;
459 break;
460 }
461 count -= sizeof(struct snd_seq_event);
462 buf += sizeof(struct snd_seq_event);
463 }
464 snd_seq_cell_free(cell);
465 cell = NULL; /* to be sure */
466 result += sizeof(struct snd_seq_event);
467 }
468
469 if (err < 0) {
470 if (cell)
471 snd_seq_fifo_cell_putback(fifo, cell);
472 if (err == -EAGAIN && result > 0)
473 err = 0;
474 }
475 snd_seq_fifo_unlock(fifo);
476
477 return (err < 0) ? err : result;
478 }
479
480
481 /*
482 * check access permission to the port
483 */
484 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
485 {
486 if ((port->capability & flags) != flags)
487 return 0;
488 return flags;
489 }
490
491 /*
492 * check if the destination client is available, and return the pointer
493 * if filter is non-zero, client filter bitmap is tested.
494 */
495 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
496 int filter)
497 {
498 struct snd_seq_client *dest;
499
500 dest = snd_seq_client_use_ptr(event->dest.client);
501 if (dest == NULL)
502 return NULL;
503 if (! dest->accept_input)
504 goto __not_avail;
505 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
506 ! test_bit(event->type, dest->event_filter))
507 goto __not_avail;
508 if (filter && !(dest->filter & filter))
509 goto __not_avail;
510
511 return dest; /* ok - accessible */
512 __not_avail:
513 snd_seq_client_unlock(dest);
514 return NULL;
515 }
516
517
518 /*
519 * Return the error event.
520 *
521 * If the receiver client is a user client, the original event is
522 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
523 * the original event is also variable length, the external data is
524 * copied after the event record.
525 * If the receiver client is a kernel client, the original event is
526 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
527 * kmalloc.
528 */
529 static int bounce_error_event(struct snd_seq_client *client,
530 struct snd_seq_event *event,
531 int err, int atomic, int hop)
532 {
533 struct snd_seq_event bounce_ev;
534 int result;
535
536 if (client == NULL ||
537 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
538 ! client->accept_input)
539 return 0; /* ignored */
540
541 /* set up quoted error */
542 memset(&bounce_ev, 0, sizeof(bounce_ev));
543 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
544 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
545 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
546 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
547 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
548 bounce_ev.dest.client = client->number;
549 bounce_ev.dest.port = event->source.port;
550 bounce_ev.data.quote.origin = event->dest;
551 bounce_ev.data.quote.event = event;
552 bounce_ev.data.quote.value = -err; /* use positive value */
553 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
554 if (result < 0) {
555 client->event_lost++;
556 return result;
557 }
558
559 return result;
560 }
561
562
563 /*
564 * rewrite the time-stamp of the event record with the curren time
565 * of the given queue.
566 * return non-zero if updated.
567 */
568 static int update_timestamp_of_queue(struct snd_seq_event *event,
569 int queue, int real_time)
570 {
571 struct snd_seq_queue *q;
572
573 q = queueptr(queue);
574 if (! q)
575 return 0;
576 event->queue = queue;
577 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
578 if (real_time) {
579 event->time.time = snd_seq_timer_get_cur_time(q->timer);
580 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
581 } else {
582 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
583 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
584 }
585 queuefree(q);
586 return 1;
587 }
588
589
590 /*
591 * deliver an event to the specified destination.
592 * if filter is non-zero, client filter bitmap is tested.
593 *
594 * RETURN VALUE: 0 : if succeeded
595 * <0 : error
596 */
597 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
598 struct snd_seq_event *event,
599 int filter, int atomic, int hop)
600 {
601 struct snd_seq_client *dest = NULL;
602 struct snd_seq_client_port *dest_port = NULL;
603 int result = -ENOENT;
604 int direct;
605
606 direct = snd_seq_ev_is_direct(event);
607
608 dest = get_event_dest_client(event, filter);
609 if (dest == NULL)
610 goto __skip;
611 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
612 if (dest_port == NULL)
613 goto __skip;
614
615 /* check permission */
616 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
617 result = -EPERM;
618 goto __skip;
619 }
620
621 if (dest_port->timestamping)
622 update_timestamp_of_queue(event, dest_port->time_queue,
623 dest_port->time_real);
624
625 switch (dest->type) {
626 case USER_CLIENT:
627 if (dest->data.user.fifo)
628 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
629 break;
630
631 case KERNEL_CLIENT:
632 if (dest_port->event_input == NULL)
633 break;
634 result = dest_port->event_input(event, direct,
635 dest_port->private_data,
636 atomic, hop);
637 break;
638 default:
639 break;
640 }
641
642 __skip:
643 if (dest_port)
644 snd_seq_port_unlock(dest_port);
645 if (dest)
646 snd_seq_client_unlock(dest);
647
648 if (result < 0 && !direct) {
649 result = bounce_error_event(client, event, result, atomic, hop);
650 }
651 return result;
652 }
653
654
655 /*
656 * send the event to all subscribers:
657 */
658 static int deliver_to_subscribers(struct snd_seq_client *client,
659 struct snd_seq_event *event,
660 int atomic, int hop)
661 {
662 struct snd_seq_subscribers *subs;
663 int err = 0, num_ev = 0;
664 struct snd_seq_event event_saved;
665 struct snd_seq_client_port *src_port;
666 struct snd_seq_port_subs_info *grp;
667
668 src_port = snd_seq_port_use_ptr(client, event->source.port);
669 if (src_port == NULL)
670 return -EINVAL; /* invalid source port */
671 /* save original event record */
672 event_saved = *event;
673 grp = &src_port->c_src;
674
675 /* lock list */
676 if (atomic)
677 read_lock(&grp->list_lock);
678 else
679 down_read(&grp->list_mutex);
680 list_for_each_entry(subs, &grp->list_head, src_list) {
681 event->dest = subs->info.dest;
682 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
683 /* convert time according to flag with subscription */
684 update_timestamp_of_queue(event, subs->info.queue,
685 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
686 err = snd_seq_deliver_single_event(client, event,
687 0, atomic, hop);
688 if (err < 0)
689 break;
690 num_ev++;
691 /* restore original event record */
692 *event = event_saved;
693 }
694 if (atomic)
695 read_unlock(&grp->list_lock);
696 else
697 up_read(&grp->list_mutex);
698 *event = event_saved; /* restore */
699 snd_seq_port_unlock(src_port);
700 return (err < 0) ? err : num_ev;
701 }
702
703
704 #ifdef SUPPORT_BROADCAST
705 /*
706 * broadcast to all ports:
707 */
708 static int port_broadcast_event(struct snd_seq_client *client,
709 struct snd_seq_event *event,
710 int atomic, int hop)
711 {
712 int num_ev = 0, err = 0;
713 struct snd_seq_client *dest_client;
714 struct snd_seq_client_port *port;
715
716 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
717 if (dest_client == NULL)
718 return 0; /* no matching destination */
719
720 read_lock(&dest_client->ports_lock);
721 list_for_each_entry(port, &dest_client->ports_list_head, list) {
722 event->dest.port = port->addr.port;
723 /* pass NULL as source client to avoid error bounce */
724 err = snd_seq_deliver_single_event(NULL, event,
725 SNDRV_SEQ_FILTER_BROADCAST,
726 atomic, hop);
727 if (err < 0)
728 break;
729 num_ev++;
730 }
731 read_unlock(&dest_client->ports_lock);
732 snd_seq_client_unlock(dest_client);
733 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
734 return (err < 0) ? err : num_ev;
735 }
736
737 /*
738 * send the event to all clients:
739 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
740 */
741 static int broadcast_event(struct snd_seq_client *client,
742 struct snd_seq_event *event, int atomic, int hop)
743 {
744 int err = 0, num_ev = 0;
745 int dest;
746 struct snd_seq_addr addr;
747
748 addr = event->dest; /* save */
749
750 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
751 /* don't send to itself */
752 if (dest == client->number)
753 continue;
754 event->dest.client = dest;
755 event->dest.port = addr.port;
756 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
757 err = port_broadcast_event(client, event, atomic, hop);
758 else
759 /* pass NULL as source client to avoid error bounce */
760 err = snd_seq_deliver_single_event(NULL, event,
761 SNDRV_SEQ_FILTER_BROADCAST,
762 atomic, hop);
763 if (err < 0)
764 break;
765 num_ev += err;
766 }
767 event->dest = addr; /* restore */
768 return (err < 0) ? err : num_ev;
769 }
770
771
772 /* multicast - not supported yet */
773 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
774 int atomic, int hop)
775 {
776 snd_printd("seq: multicast not supported yet.\n");
777 return 0; /* ignored */
778 }
779 #endif /* SUPPORT_BROADCAST */
780
781
782 /* deliver an event to the destination port(s).
783 * if the event is to subscribers or broadcast, the event is dispatched
784 * to multiple targets.
785 *
786 * RETURN VALUE: n > 0 : the number of delivered events.
787 * n == 0 : the event was not passed to any client.
788 * n < 0 : error - event was not processed.
789 */
790 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
791 int atomic, int hop)
792 {
793 int result;
794
795 hop++;
796 if (hop >= SNDRV_SEQ_MAX_HOPS) {
797 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
798 event->source.client, event->source.port,
799 event->dest.client, event->dest.port);
800 return -EMLINK;
801 }
802
803 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
804 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
805 result = deliver_to_subscribers(client, event, atomic, hop);
806 #ifdef SUPPORT_BROADCAST
807 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
808 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
809 result = broadcast_event(client, event, atomic, hop);
810 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
811 result = multicast_event(client, event, atomic, hop);
812 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
813 result = port_broadcast_event(client, event, atomic, hop);
814 #endif
815 else
816 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
817
818 return result;
819 }
820
821 /*
822 * dispatch an event cell:
823 * This function is called only from queue check routines in timer
824 * interrupts or after enqueued.
825 * The event cell shall be released or re-queued in this function.
826 *
827 * RETURN VALUE: n > 0 : the number of delivered events.
828 * n == 0 : the event was not passed to any client.
829 * n < 0 : error - event was not processed.
830 */
831 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
832 {
833 struct snd_seq_client *client;
834 int result;
835
836 if (snd_BUG_ON(!cell))
837 return -EINVAL;
838
839 client = snd_seq_client_use_ptr(cell->event.source.client);
840 if (client == NULL) {
841 snd_seq_cell_free(cell); /* release this cell */
842 return -EINVAL;
843 }
844
845 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
846 /* NOTE event:
847 * the event cell is re-used as a NOTE-OFF event and
848 * enqueued again.
849 */
850 struct snd_seq_event tmpev, *ev;
851
852 /* reserve this event to enqueue note-off later */
853 tmpev = cell->event;
854 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
855 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
856
857 /*
858 * This was originally a note event. We now re-use the
859 * cell for the note-off event.
860 */
861
862 ev = &cell->event;
863 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
864 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
865
866 /* add the duration time */
867 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
868 case SNDRV_SEQ_TIME_STAMP_TICK:
869 ev->time.tick += ev->data.note.duration;
870 break;
871 case SNDRV_SEQ_TIME_STAMP_REAL:
872 /* unit for duration is ms */
873 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
874 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
875 ev->time.time.tv_nsec / 1000000000;
876 ev->time.time.tv_nsec %= 1000000000;
877 break;
878 }
879 ev->data.note.velocity = ev->data.note.off_velocity;
880
881 /* Now queue this cell as the note off event */
882 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
883 snd_seq_cell_free(cell); /* release this cell */
884
885 } else {
886 /* Normal events:
887 * event cell is freed after processing the event
888 */
889
890 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
891 snd_seq_cell_free(cell);
892 }
893
894 snd_seq_client_unlock(client);
895 return result;
896 }
897
898
899 /* Allocate a cell from client pool and enqueue it to queue:
900 * if pool is empty and blocking is TRUE, sleep until a new cell is
901 * available.
902 */
903 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
904 struct snd_seq_event *event,
905 struct file *file, int blocking,
906 int atomic, int hop)
907 {
908 struct snd_seq_event_cell *cell;
909 int err;
910
911 /* special queue values - force direct passing */
912 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
913 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
914 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
915 } else
916 #ifdef SUPPORT_BROADCAST
917 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
918 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
919 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
920 }
921 #endif
922 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
923 /* check presence of source port */
924 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
925 if (src_port == NULL)
926 return -EINVAL;
927 snd_seq_port_unlock(src_port);
928 }
929
930 /* direct event processing without enqueued */
931 if (snd_seq_ev_is_direct(event)) {
932 if (event->type == SNDRV_SEQ_EVENT_NOTE)
933 return -EINVAL; /* this event must be enqueued! */
934 return snd_seq_deliver_event(client, event, atomic, hop);
935 }
936
937 /* Not direct, normal queuing */
938 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
939 return -EINVAL; /* invalid queue */
940 if (! snd_seq_write_pool_allocated(client))
941 return -ENXIO; /* queue is not allocated */
942
943 /* allocate an event cell */
944 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
945 if (err < 0)
946 return err;
947
948 /* we got a cell. enqueue it. */
949 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
950 snd_seq_cell_free(cell);
951 return err;
952 }
953
954 return 0;
955 }
956
957
958 /*
959 * check validity of event type and data length.
960 * return non-zero if invalid.
961 */
962 static int check_event_type_and_length(struct snd_seq_event *ev)
963 {
964 switch (snd_seq_ev_length_type(ev)) {
965 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
966 if (snd_seq_ev_is_variable_type(ev))
967 return -EINVAL;
968 break;
969 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
970 if (! snd_seq_ev_is_variable_type(ev) ||
971 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
972 return -EINVAL;
973 break;
974 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
975 if (! snd_seq_ev_is_direct(ev))
976 return -EINVAL;
977 break;
978 }
979 return 0;
980 }
981
982
983 /* handle write() */
984 /* possible error values:
985 * -ENXIO invalid client or file open mode
986 * -ENOMEM malloc failed
987 * -EFAULT seg. fault during copy from user space
988 * -EINVAL invalid event
989 * -EAGAIN no space in output pool
990 * -EINTR interrupts while sleep
991 * -EMLINK too many hops
992 * others depends on return value from driver callback
993 */
994 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
995 size_t count, loff_t *offset)
996 {
997 struct snd_seq_client *client = file->private_data;
998 int written = 0, len;
999 int err = -EINVAL;
1000 struct snd_seq_event event;
1001
1002 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1003 return -ENXIO;
1004
1005 /* check client structures are in place */
1006 if (snd_BUG_ON(!client))
1007 return -ENXIO;
1008
1009 if (!client->accept_output || client->pool == NULL)
1010 return -ENXIO;
1011
1012 /* allocate the pool now if the pool is not allocated yet */
1013 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1014 if (snd_seq_pool_init(client->pool) < 0)
1015 return -ENOMEM;
1016 }
1017
1018 /* only process whole events */
1019 while (count >= sizeof(struct snd_seq_event)) {
1020 /* Read in the event header from the user */
1021 len = sizeof(event);
1022 if (copy_from_user(&event, buf, len)) {
1023 err = -EFAULT;
1024 break;
1025 }
1026 event.source.client = client->number; /* fill in client number */
1027 /* Check for extension data length */
1028 if (check_event_type_and_length(&event)) {
1029 err = -EINVAL;
1030 break;
1031 }
1032
1033 /* check for special events */
1034 if (event.type == SNDRV_SEQ_EVENT_NONE)
1035 goto __skip_event;
1036 else if (snd_seq_ev_is_reserved(&event)) {
1037 err = -EINVAL;
1038 break;
1039 }
1040
1041 if (snd_seq_ev_is_variable(&event)) {
1042 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1043 if ((size_t)(extlen + len) > count) {
1044 /* back out, will get an error this time or next */
1045 err = -EINVAL;
1046 break;
1047 }
1048 /* set user space pointer */
1049 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1050 event.data.ext.ptr = (char __force *)buf
1051 + sizeof(struct snd_seq_event);
1052 len += extlen; /* increment data length */
1053 } else {
1054 #ifdef CONFIG_COMPAT
1055 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1056 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1057 event.data.ext.ptr = ptr;
1058 }
1059 #endif
1060 }
1061
1062 /* ok, enqueue it */
1063 err = snd_seq_client_enqueue_event(client, &event, file,
1064 !(file->f_flags & O_NONBLOCK),
1065 0, 0);
1066 if (err < 0)
1067 break;
1068
1069 __skip_event:
1070 /* Update pointers and counts */
1071 count -= len;
1072 buf += len;
1073 written += len;
1074 }
1075
1076 return written ? written : err;
1077 }
1078
1079
1080 /*
1081 * handle polling
1082 */
1083 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1084 {
1085 struct snd_seq_client *client = file->private_data;
1086 unsigned int mask = 0;
1087
1088 /* check client structures are in place */
1089 if (snd_BUG_ON(!client))
1090 return -ENXIO;
1091
1092 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1093 client->data.user.fifo) {
1094
1095 /* check if data is available in the outqueue */
1096 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1097 mask |= POLLIN | POLLRDNORM;
1098 }
1099
1100 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1101
1102 /* check if data is available in the pool */
1103 if (!snd_seq_write_pool_allocated(client) ||
1104 snd_seq_pool_poll_wait(client->pool, file, wait))
1105 mask |= POLLOUT | POLLWRNORM;
1106 }
1107
1108 return mask;
1109 }
1110
1111
1112 /*-----------------------------------------------------*/
1113
1114
1115 /* SYSTEM_INFO ioctl() */
1116 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1117 {
1118 struct snd_seq_system_info info;
1119
1120 memset(&info, 0, sizeof(info));
1121 /* fill the info fields */
1122 info.queues = SNDRV_SEQ_MAX_QUEUES;
1123 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1124 info.ports = 256; /* fixed limit */
1125 info.channels = 256; /* fixed limit */
1126 info.cur_clients = client_usage.cur;
1127 info.cur_queues = snd_seq_queue_get_cur_queues();
1128
1129 if (copy_to_user(arg, &info, sizeof(info)))
1130 return -EFAULT;
1131 return 0;
1132 }
1133
1134
1135 /* RUNNING_MODE ioctl() */
1136 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1137 {
1138 struct snd_seq_running_info info;
1139 struct snd_seq_client *cptr;
1140 int err = 0;
1141
1142 if (copy_from_user(&info, arg, sizeof(info)))
1143 return -EFAULT;
1144
1145 /* requested client number */
1146 cptr = snd_seq_client_use_ptr(info.client);
1147 if (cptr == NULL)
1148 return -ENOENT; /* don't change !!! */
1149
1150 #ifdef SNDRV_BIG_ENDIAN
1151 if (! info.big_endian) {
1152 err = -EINVAL;
1153 goto __err;
1154 }
1155 #else
1156 if (info.big_endian) {
1157 err = -EINVAL;
1158 goto __err;
1159 }
1160
1161 #endif
1162 if (info.cpu_mode > sizeof(long)) {
1163 err = -EINVAL;
1164 goto __err;
1165 }
1166 cptr->convert32 = (info.cpu_mode < sizeof(long));
1167 __err:
1168 snd_seq_client_unlock(cptr);
1169 return err;
1170 }
1171
1172 /* CLIENT_INFO ioctl() */
1173 static void get_client_info(struct snd_seq_client *cptr,
1174 struct snd_seq_client_info *info)
1175 {
1176 info->client = cptr->number;
1177
1178 /* fill the info fields */
1179 info->type = cptr->type;
1180 strcpy(info->name, cptr->name);
1181 info->filter = cptr->filter;
1182 info->event_lost = cptr->event_lost;
1183 memcpy(info->event_filter, cptr->event_filter, 32);
1184 info->num_ports = cptr->num_ports;
1185 memset(info->reserved, 0, sizeof(info->reserved));
1186 }
1187
1188 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1189 void __user *arg)
1190 {
1191 struct snd_seq_client *cptr;
1192 struct snd_seq_client_info client_info;
1193
1194 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1195 return -EFAULT;
1196
1197 /* requested client number */
1198 cptr = snd_seq_client_use_ptr(client_info.client);
1199 if (cptr == NULL)
1200 return -ENOENT; /* don't change !!! */
1201
1202 get_client_info(cptr, &client_info);
1203 snd_seq_client_unlock(cptr);
1204
1205 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1206 return -EFAULT;
1207 return 0;
1208 }
1209
1210
1211 /* CLIENT_INFO ioctl() */
1212 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1213 void __user *arg)
1214 {
1215 struct snd_seq_client_info client_info;
1216
1217 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1218 return -EFAULT;
1219
1220 /* it is not allowed to set the info fields for an another client */
1221 if (client->number != client_info.client)
1222 return -EPERM;
1223 /* also client type must be set now */
1224 if (client->type != client_info.type)
1225 return -EINVAL;
1226
1227 /* fill the info fields */
1228 if (client_info.name[0])
1229 strlcpy(client->name, client_info.name, sizeof(client->name));
1230
1231 client->filter = client_info.filter;
1232 client->event_lost = client_info.event_lost;
1233 memcpy(client->event_filter, client_info.event_filter, 32);
1234
1235 return 0;
1236 }
1237
1238
1239 /*
1240 * CREATE PORT ioctl()
1241 */
1242 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1243 void __user *arg)
1244 {
1245 struct snd_seq_client_port *port;
1246 struct snd_seq_port_info info;
1247 struct snd_seq_port_callback *callback;
1248
1249 if (copy_from_user(&info, arg, sizeof(info)))
1250 return -EFAULT;
1251
1252 /* it is not allowed to create the port for an another client */
1253 if (info.addr.client != client->number)
1254 return -EPERM;
1255
1256 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1257 if (port == NULL)
1258 return -ENOMEM;
1259
1260 if (client->type == USER_CLIENT && info.kernel) {
1261 snd_seq_delete_port(client, port->addr.port);
1262 return -EINVAL;
1263 }
1264 if (client->type == KERNEL_CLIENT) {
1265 if ((callback = info.kernel) != NULL) {
1266 if (callback->owner)
1267 port->owner = callback->owner;
1268 port->private_data = callback->private_data;
1269 port->private_free = callback->private_free;
1270 port->callback_all = callback->callback_all;
1271 port->event_input = callback->event_input;
1272 port->c_src.open = callback->subscribe;
1273 port->c_src.close = callback->unsubscribe;
1274 port->c_dest.open = callback->use;
1275 port->c_dest.close = callback->unuse;
1276 }
1277 }
1278
1279 info.addr = port->addr;
1280
1281 snd_seq_set_port_info(port, &info);
1282 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1283
1284 if (copy_to_user(arg, &info, sizeof(info)))
1285 return -EFAULT;
1286
1287 return 0;
1288 }
1289
1290 /*
1291 * DELETE PORT ioctl()
1292 */
1293 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1294 void __user *arg)
1295 {
1296 struct snd_seq_port_info info;
1297 int err;
1298
1299 /* set passed parameters */
1300 if (copy_from_user(&info, arg, sizeof(info)))
1301 return -EFAULT;
1302
1303 /* it is not allowed to remove the port for an another client */
1304 if (info.addr.client != client->number)
1305 return -EPERM;
1306
1307 err = snd_seq_delete_port(client, info.addr.port);
1308 if (err >= 0)
1309 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1310 return err;
1311 }
1312
1313
1314 /*
1315 * GET_PORT_INFO ioctl() (on any client)
1316 */
1317 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1318 void __user *arg)
1319 {
1320 struct snd_seq_client *cptr;
1321 struct snd_seq_client_port *port;
1322 struct snd_seq_port_info info;
1323
1324 if (copy_from_user(&info, arg, sizeof(info)))
1325 return -EFAULT;
1326 cptr = snd_seq_client_use_ptr(info.addr.client);
1327 if (cptr == NULL)
1328 return -ENXIO;
1329
1330 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1331 if (port == NULL) {
1332 snd_seq_client_unlock(cptr);
1333 return -ENOENT; /* don't change */
1334 }
1335
1336 /* get port info */
1337 snd_seq_get_port_info(port, &info);
1338 snd_seq_port_unlock(port);
1339 snd_seq_client_unlock(cptr);
1340
1341 if (copy_to_user(arg, &info, sizeof(info)))
1342 return -EFAULT;
1343 return 0;
1344 }
1345
1346
1347 /*
1348 * SET_PORT_INFO ioctl() (only ports on this/own client)
1349 */
1350 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1351 void __user *arg)
1352 {
1353 struct snd_seq_client_port *port;
1354 struct snd_seq_port_info info;
1355
1356 if (copy_from_user(&info, arg, sizeof(info)))
1357 return -EFAULT;
1358
1359 if (info.addr.client != client->number) /* only set our own ports ! */
1360 return -EPERM;
1361 port = snd_seq_port_use_ptr(client, info.addr.port);
1362 if (port) {
1363 snd_seq_set_port_info(port, &info);
1364 snd_seq_port_unlock(port);
1365 }
1366 return 0;
1367 }
1368
1369
1370 /*
1371 * port subscription (connection)
1372 */
1373 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1374 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1375
1376 static int check_subscription_permission(struct snd_seq_client *client,
1377 struct snd_seq_client_port *sport,
1378 struct snd_seq_client_port *dport,
1379 struct snd_seq_port_subscribe *subs)
1380 {
1381 if (client->number != subs->sender.client &&
1382 client->number != subs->dest.client) {
1383 /* connection by third client - check export permission */
1384 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1385 return -EPERM;
1386 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1387 return -EPERM;
1388 }
1389
1390 /* check read permission */
1391 /* if sender or receiver is the subscribing client itself,
1392 * no permission check is necessary
1393 */
1394 if (client->number != subs->sender.client) {
1395 if (! check_port_perm(sport, PERM_RD))
1396 return -EPERM;
1397 }
1398 /* check write permission */
1399 if (client->number != subs->dest.client) {
1400 if (! check_port_perm(dport, PERM_WR))
1401 return -EPERM;
1402 }
1403 return 0;
1404 }
1405
1406 /*
1407 * send an subscription notify event to user client:
1408 * client must be user client.
1409 */
1410 int snd_seq_client_notify_subscription(int client, int port,
1411 struct snd_seq_port_subscribe *info,
1412 int evtype)
1413 {
1414 struct snd_seq_event event;
1415
1416 memset(&event, 0, sizeof(event));
1417 event.type = evtype;
1418 event.data.connect.dest = info->dest;
1419 event.data.connect.sender = info->sender;
1420
1421 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1422 }
1423
1424
1425 /*
1426 * add to port's subscription list IOCTL interface
1427 */
1428 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1429 void __user *arg)
1430 {
1431 int result = -EINVAL;
1432 struct snd_seq_client *receiver = NULL, *sender = NULL;
1433 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1434 struct snd_seq_port_subscribe subs;
1435
1436 if (copy_from_user(&subs, arg, sizeof(subs)))
1437 return -EFAULT;
1438
1439 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1440 goto __end;
1441 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1442 goto __end;
1443 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1444 goto __end;
1445 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1446 goto __end;
1447
1448 result = check_subscription_permission(client, sport, dport, &subs);
1449 if (result < 0)
1450 goto __end;
1451
1452 /* connect them */
1453 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1454 if (! result) /* broadcast announce */
1455 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1456 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1457 __end:
1458 if (sport)
1459 snd_seq_port_unlock(sport);
1460 if (dport)
1461 snd_seq_port_unlock(dport);
1462 if (sender)
1463 snd_seq_client_unlock(sender);
1464 if (receiver)
1465 snd_seq_client_unlock(receiver);
1466 return result;
1467 }
1468
1469
1470 /*
1471 * remove from port's subscription list
1472 */
1473 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1474 void __user *arg)
1475 {
1476 int result = -ENXIO;
1477 struct snd_seq_client *receiver = NULL, *sender = NULL;
1478 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1479 struct snd_seq_port_subscribe subs;
1480
1481 if (copy_from_user(&subs, arg, sizeof(subs)))
1482 return -EFAULT;
1483
1484 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1485 goto __end;
1486 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1487 goto __end;
1488 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1489 goto __end;
1490 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1491 goto __end;
1492
1493 result = check_subscription_permission(client, sport, dport, &subs);
1494 if (result < 0)
1495 goto __end;
1496
1497 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1498 if (! result) /* broadcast announce */
1499 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1500 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1501 __end:
1502 if (sport)
1503 snd_seq_port_unlock(sport);
1504 if (dport)
1505 snd_seq_port_unlock(dport);
1506 if (sender)
1507 snd_seq_client_unlock(sender);
1508 if (receiver)
1509 snd_seq_client_unlock(receiver);
1510 return result;
1511 }
1512
1513
1514 /* CREATE_QUEUE ioctl() */
1515 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1516 void __user *arg)
1517 {
1518 struct snd_seq_queue_info info;
1519 int result;
1520 struct snd_seq_queue *q;
1521
1522 if (copy_from_user(&info, arg, sizeof(info)))
1523 return -EFAULT;
1524
1525 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1526 if (result < 0)
1527 return result;
1528
1529 q = queueptr(result);
1530 if (q == NULL)
1531 return -EINVAL;
1532
1533 info.queue = q->queue;
1534 info.locked = q->locked;
1535 info.owner = q->owner;
1536
1537 /* set queue name */
1538 if (! info.name[0])
1539 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1540 strlcpy(q->name, info.name, sizeof(q->name));
1541 queuefree(q);
1542
1543 if (copy_to_user(arg, &info, sizeof(info)))
1544 return -EFAULT;
1545
1546 return 0;
1547 }
1548
1549 /* DELETE_QUEUE ioctl() */
1550 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1551 void __user *arg)
1552 {
1553 struct snd_seq_queue_info info;
1554
1555 if (copy_from_user(&info, arg, sizeof(info)))
1556 return -EFAULT;
1557
1558 return snd_seq_queue_delete(client->number, info.queue);
1559 }
1560
1561 /* GET_QUEUE_INFO ioctl() */
1562 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1563 void __user *arg)
1564 {
1565 struct snd_seq_queue_info info;
1566 struct snd_seq_queue *q;
1567
1568 if (copy_from_user(&info, arg, sizeof(info)))
1569 return -EFAULT;
1570
1571 q = queueptr(info.queue);
1572 if (q == NULL)
1573 return -EINVAL;
1574
1575 memset(&info, 0, sizeof(info));
1576 info.queue = q->queue;
1577 info.owner = q->owner;
1578 info.locked = q->locked;
1579 strlcpy(info.name, q->name, sizeof(info.name));
1580 queuefree(q);
1581
1582 if (copy_to_user(arg, &info, sizeof(info)))
1583 return -EFAULT;
1584
1585 return 0;
1586 }
1587
1588 /* SET_QUEUE_INFO ioctl() */
1589 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1590 void __user *arg)
1591 {
1592 struct snd_seq_queue_info info;
1593 struct snd_seq_queue *q;
1594
1595 if (copy_from_user(&info, arg, sizeof(info)))
1596 return -EFAULT;
1597
1598 if (info.owner != client->number)
1599 return -EINVAL;
1600
1601 /* change owner/locked permission */
1602 if (snd_seq_queue_check_access(info.queue, client->number)) {
1603 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1604 return -EPERM;
1605 if (info.locked)
1606 snd_seq_queue_use(info.queue, client->number, 1);
1607 } else {
1608 return -EPERM;
1609 }
1610
1611 q = queueptr(info.queue);
1612 if (! q)
1613 return -EINVAL;
1614 if (q->owner != client->number) {
1615 queuefree(q);
1616 return -EPERM;
1617 }
1618 strlcpy(q->name, info.name, sizeof(q->name));
1619 queuefree(q);
1620
1621 return 0;
1622 }
1623
1624 /* GET_NAMED_QUEUE ioctl() */
1625 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1626 {
1627 struct snd_seq_queue_info info;
1628 struct snd_seq_queue *q;
1629
1630 if (copy_from_user(&info, arg, sizeof(info)))
1631 return -EFAULT;
1632
1633 q = snd_seq_queue_find_name(info.name);
1634 if (q == NULL)
1635 return -EINVAL;
1636 info.queue = q->queue;
1637 info.owner = q->owner;
1638 info.locked = q->locked;
1639 queuefree(q);
1640
1641 if (copy_to_user(arg, &info, sizeof(info)))
1642 return -EFAULT;
1643
1644 return 0;
1645 }
1646
1647 /* GET_QUEUE_STATUS ioctl() */
1648 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1649 void __user *arg)
1650 {
1651 struct snd_seq_queue_status status;
1652 struct snd_seq_queue *queue;
1653 struct snd_seq_timer *tmr;
1654
1655 if (copy_from_user(&status, arg, sizeof(status)))
1656 return -EFAULT;
1657
1658 queue = queueptr(status.queue);
1659 if (queue == NULL)
1660 return -EINVAL;
1661 memset(&status, 0, sizeof(status));
1662 status.queue = queue->queue;
1663
1664 tmr = queue->timer;
1665 status.events = queue->tickq->cells + queue->timeq->cells;
1666
1667 status.time = snd_seq_timer_get_cur_time(tmr);
1668 status.tick = snd_seq_timer_get_cur_tick(tmr);
1669
1670 status.running = tmr->running;
1671
1672 status.flags = queue->flags;
1673 queuefree(queue);
1674
1675 if (copy_to_user(arg, &status, sizeof(status)))
1676 return -EFAULT;
1677 return 0;
1678 }
1679
1680
1681 /* GET_QUEUE_TEMPO ioctl() */
1682 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1683 void __user *arg)
1684 {
1685 struct snd_seq_queue_tempo tempo;
1686 struct snd_seq_queue *queue;
1687 struct snd_seq_timer *tmr;
1688
1689 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1690 return -EFAULT;
1691
1692 queue = queueptr(tempo.queue);
1693 if (queue == NULL)
1694 return -EINVAL;
1695 memset(&tempo, 0, sizeof(tempo));
1696 tempo.queue = queue->queue;
1697
1698 tmr = queue->timer;
1699
1700 tempo.tempo = tmr->tempo;
1701 tempo.ppq = tmr->ppq;
1702 tempo.skew_value = tmr->skew;
1703 tempo.skew_base = tmr->skew_base;
1704 queuefree(queue);
1705
1706 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1707 return -EFAULT;
1708 return 0;
1709 }
1710
1711
1712 /* SET_QUEUE_TEMPO ioctl() */
1713 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1714 {
1715 if (!snd_seq_queue_check_access(tempo->queue, client))
1716 return -EPERM;
1717 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1718 }
1719
1720 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1721
1722 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1723 void __user *arg)
1724 {
1725 int result;
1726 struct snd_seq_queue_tempo tempo;
1727
1728 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1729 return -EFAULT;
1730
1731 result = snd_seq_set_queue_tempo(client->number, &tempo);
1732 return result < 0 ? result : 0;
1733 }
1734
1735
1736 /* GET_QUEUE_TIMER ioctl() */
1737 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1738 void __user *arg)
1739 {
1740 struct snd_seq_queue_timer timer;
1741 struct snd_seq_queue *queue;
1742 struct snd_seq_timer *tmr;
1743
1744 if (copy_from_user(&timer, arg, sizeof(timer)))
1745 return -EFAULT;
1746
1747 queue = queueptr(timer.queue);
1748 if (queue == NULL)
1749 return -EINVAL;
1750
1751 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1752 queuefree(queue);
1753 return -ERESTARTSYS;
1754 }
1755 tmr = queue->timer;
1756 memset(&timer, 0, sizeof(timer));
1757 timer.queue = queue->queue;
1758
1759 timer.type = tmr->type;
1760 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1761 timer.u.alsa.id = tmr->alsa_id;
1762 timer.u.alsa.resolution = tmr->preferred_resolution;
1763 }
1764 mutex_unlock(&queue->timer_mutex);
1765 queuefree(queue);
1766
1767 if (copy_to_user(arg, &timer, sizeof(timer)))
1768 return -EFAULT;
1769 return 0;
1770 }
1771
1772
1773 /* SET_QUEUE_TIMER ioctl() */
1774 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1775 void __user *arg)
1776 {
1777 int result = 0;
1778 struct snd_seq_queue_timer timer;
1779
1780 if (copy_from_user(&timer, arg, sizeof(timer)))
1781 return -EFAULT;
1782
1783 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1784 return -EINVAL;
1785
1786 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1787 struct snd_seq_queue *q;
1788 struct snd_seq_timer *tmr;
1789
1790 q = queueptr(timer.queue);
1791 if (q == NULL)
1792 return -ENXIO;
1793 if (mutex_lock_interruptible(&q->timer_mutex)) {
1794 queuefree(q);
1795 return -ERESTARTSYS;
1796 }
1797 tmr = q->timer;
1798 snd_seq_queue_timer_close(timer.queue);
1799 tmr->type = timer.type;
1800 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1801 tmr->alsa_id = timer.u.alsa.id;
1802 tmr->preferred_resolution = timer.u.alsa.resolution;
1803 }
1804 result = snd_seq_queue_timer_open(timer.queue);
1805 mutex_unlock(&q->timer_mutex);
1806 queuefree(q);
1807 } else {
1808 return -EPERM;
1809 }
1810
1811 return result;
1812 }
1813
1814
1815 /* GET_QUEUE_CLIENT ioctl() */
1816 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1817 void __user *arg)
1818 {
1819 struct snd_seq_queue_client info;
1820 int used;
1821
1822 if (copy_from_user(&info, arg, sizeof(info)))
1823 return -EFAULT;
1824
1825 used = snd_seq_queue_is_used(info.queue, client->number);
1826 if (used < 0)
1827 return -EINVAL;
1828 info.used = used;
1829 info.client = client->number;
1830
1831 if (copy_to_user(arg, &info, sizeof(info)))
1832 return -EFAULT;
1833 return 0;
1834 }
1835
1836
1837 /* SET_QUEUE_CLIENT ioctl() */
1838 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1839 void __user *arg)
1840 {
1841 int err;
1842 struct snd_seq_queue_client info;
1843
1844 if (copy_from_user(&info, arg, sizeof(info)))
1845 return -EFAULT;
1846
1847 if (info.used >= 0) {
1848 err = snd_seq_queue_use(info.queue, client->number, info.used);
1849 if (err < 0)
1850 return err;
1851 }
1852
1853 return snd_seq_ioctl_get_queue_client(client, arg);
1854 }
1855
1856
1857 /* GET_CLIENT_POOL ioctl() */
1858 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1859 void __user *arg)
1860 {
1861 struct snd_seq_client_pool info;
1862 struct snd_seq_client *cptr;
1863
1864 if (copy_from_user(&info, arg, sizeof(info)))
1865 return -EFAULT;
1866
1867 cptr = snd_seq_client_use_ptr(info.client);
1868 if (cptr == NULL)
1869 return -ENOENT;
1870 memset(&info, 0, sizeof(info));
1871 info.output_pool = cptr->pool->size;
1872 info.output_room = cptr->pool->room;
1873 info.output_free = info.output_pool;
1874 info.output_free = snd_seq_unused_cells(cptr->pool);
1875 if (cptr->type == USER_CLIENT) {
1876 info.input_pool = cptr->data.user.fifo_pool_size;
1877 info.input_free = info.input_pool;
1878 if (cptr->data.user.fifo)
1879 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1880 } else {
1881 info.input_pool = 0;
1882 info.input_free = 0;
1883 }
1884 snd_seq_client_unlock(cptr);
1885
1886 if (copy_to_user(arg, &info, sizeof(info)))
1887 return -EFAULT;
1888 return 0;
1889 }
1890
1891 /* SET_CLIENT_POOL ioctl() */
1892 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1893 void __user *arg)
1894 {
1895 struct snd_seq_client_pool info;
1896 int rc;
1897
1898 if (copy_from_user(&info, arg, sizeof(info)))
1899 return -EFAULT;
1900
1901 if (client->number != info.client)
1902 return -EINVAL; /* can't change other clients */
1903
1904 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1905 (! snd_seq_write_pool_allocated(client) ||
1906 info.output_pool != client->pool->size)) {
1907 if (snd_seq_write_pool_allocated(client)) {
1908 /* remove all existing cells */
1909 snd_seq_queue_client_leave_cells(client->number);
1910 snd_seq_pool_done(client->pool);
1911 }
1912 client->pool->size = info.output_pool;
1913 rc = snd_seq_pool_init(client->pool);
1914 if (rc < 0)
1915 return rc;
1916 }
1917 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1918 info.input_pool >= 1 &&
1919 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1920 info.input_pool != client->data.user.fifo_pool_size) {
1921 /* change pool size */
1922 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1923 if (rc < 0)
1924 return rc;
1925 client->data.user.fifo_pool_size = info.input_pool;
1926 }
1927 if (info.output_room >= 1 &&
1928 info.output_room <= client->pool->size) {
1929 client->pool->room = info.output_room;
1930 }
1931
1932 return snd_seq_ioctl_get_client_pool(client, arg);
1933 }
1934
1935
1936 /* REMOVE_EVENTS ioctl() */
1937 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1938 void __user *arg)
1939 {
1940 struct snd_seq_remove_events info;
1941
1942 if (copy_from_user(&info, arg, sizeof(info)))
1943 return -EFAULT;
1944
1945 /*
1946 * Input mostly not implemented XXX.
1947 */
1948 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1949 /*
1950 * No restrictions so for a user client we can clear
1951 * the whole fifo
1952 */
1953 if (client->type == USER_CLIENT)
1954 snd_seq_fifo_clear(client->data.user.fifo);
1955 }
1956
1957 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1958 snd_seq_queue_remove_cells(client->number, &info);
1959
1960 return 0;
1961 }
1962
1963
1964 /*
1965 * get subscription info
1966 */
1967 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1968 void __user *arg)
1969 {
1970 int result;
1971 struct snd_seq_client *sender = NULL;
1972 struct snd_seq_client_port *sport = NULL;
1973 struct snd_seq_port_subscribe subs;
1974 struct snd_seq_subscribers *p;
1975
1976 if (copy_from_user(&subs, arg, sizeof(subs)))
1977 return -EFAULT;
1978
1979 result = -EINVAL;
1980 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1981 goto __end;
1982 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1983 goto __end;
1984 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1985 if (p) {
1986 result = 0;
1987 subs = p->info;
1988 } else
1989 result = -ENOENT;
1990
1991 __end:
1992 if (sport)
1993 snd_seq_port_unlock(sport);
1994 if (sender)
1995 snd_seq_client_unlock(sender);
1996 if (result >= 0) {
1997 if (copy_to_user(arg, &subs, sizeof(subs)))
1998 return -EFAULT;
1999 }
2000 return result;
2001 }
2002
2003
2004 /*
2005 * get subscription info - check only its presence
2006 */
2007 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2008 void __user *arg)
2009 {
2010 int result = -ENXIO;
2011 struct snd_seq_client *cptr = NULL;
2012 struct snd_seq_client_port *port = NULL;
2013 struct snd_seq_query_subs subs;
2014 struct snd_seq_port_subs_info *group;
2015 struct list_head *p;
2016 int i;
2017
2018 if (copy_from_user(&subs, arg, sizeof(subs)))
2019 return -EFAULT;
2020
2021 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2022 goto __end;
2023 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2024 goto __end;
2025
2026 switch (subs.type) {
2027 case SNDRV_SEQ_QUERY_SUBS_READ:
2028 group = &port->c_src;
2029 break;
2030 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2031 group = &port->c_dest;
2032 break;
2033 default:
2034 goto __end;
2035 }
2036
2037 down_read(&group->list_mutex);
2038 /* search for the subscriber */
2039 subs.num_subs = group->count;
2040 i = 0;
2041 result = -ENOENT;
2042 list_for_each(p, &group->list_head) {
2043 if (i++ == subs.index) {
2044 /* found! */
2045 struct snd_seq_subscribers *s;
2046 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2047 s = list_entry(p, struct snd_seq_subscribers, src_list);
2048 subs.addr = s->info.dest;
2049 } else {
2050 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2051 subs.addr = s->info.sender;
2052 }
2053 subs.flags = s->info.flags;
2054 subs.queue = s->info.queue;
2055 result = 0;
2056 break;
2057 }
2058 }
2059 up_read(&group->list_mutex);
2060
2061 __end:
2062 if (port)
2063 snd_seq_port_unlock(port);
2064 if (cptr)
2065 snd_seq_client_unlock(cptr);
2066 if (result >= 0) {
2067 if (copy_to_user(arg, &subs, sizeof(subs)))
2068 return -EFAULT;
2069 }
2070 return result;
2071 }
2072
2073
2074 /*
2075 * query next client
2076 */
2077 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2078 void __user *arg)
2079 {
2080 struct snd_seq_client *cptr = NULL;
2081 struct snd_seq_client_info info;
2082
2083 if (copy_from_user(&info, arg, sizeof(info)))
2084 return -EFAULT;
2085
2086 /* search for next client */
2087 info.client++;
2088 if (info.client < 0)
2089 info.client = 0;
2090 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2091 cptr = snd_seq_client_use_ptr(info.client);
2092 if (cptr)
2093 break; /* found */
2094 }
2095 if (cptr == NULL)
2096 return -ENOENT;
2097
2098 get_client_info(cptr, &info);
2099 snd_seq_client_unlock(cptr);
2100
2101 if (copy_to_user(arg, &info, sizeof(info)))
2102 return -EFAULT;
2103 return 0;
2104 }
2105
2106 /*
2107 * query next port
2108 */
2109 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2110 void __user *arg)
2111 {
2112 struct snd_seq_client *cptr;
2113 struct snd_seq_client_port *port = NULL;
2114 struct snd_seq_port_info info;
2115
2116 if (copy_from_user(&info, arg, sizeof(info)))
2117 return -EFAULT;
2118 cptr = snd_seq_client_use_ptr(info.addr.client);
2119 if (cptr == NULL)
2120 return -ENXIO;
2121
2122 /* search for next port */
2123 info.addr.port++;
2124 port = snd_seq_port_query_nearest(cptr, &info);
2125 if (port == NULL) {
2126 snd_seq_client_unlock(cptr);
2127 return -ENOENT;
2128 }
2129
2130 /* get port info */
2131 info.addr = port->addr;
2132 snd_seq_get_port_info(port, &info);
2133 snd_seq_port_unlock(port);
2134 snd_seq_client_unlock(cptr);
2135
2136 if (copy_to_user(arg, &info, sizeof(info)))
2137 return -EFAULT;
2138 return 0;
2139 }
2140
2141 /* -------------------------------------------------------- */
2142
2143 static struct seq_ioctl_table {
2144 unsigned int cmd;
2145 int (*func)(struct snd_seq_client *client, void __user * arg);
2146 } ioctl_tables[] = {
2147 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2148 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2149 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2150 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2151 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2152 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2153 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2154 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2155 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2156 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2157 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2158 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2159 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2160 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2161 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2162 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2163 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2164 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2165 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2166 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2167 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2168 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2169 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2170 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2171 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2172 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2173 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2174 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2175 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2176 { 0, NULL },
2177 };
2178
2179 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2180 void __user *arg)
2181 {
2182 struct seq_ioctl_table *p;
2183
2184 switch (cmd) {
2185 case SNDRV_SEQ_IOCTL_PVERSION:
2186 /* return sequencer version number */
2187 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2188 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2189 /* return the id of this client */
2190 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2191 }
2192
2193 if (! arg)
2194 return -EFAULT;
2195 for (p = ioctl_tables; p->cmd; p++) {
2196 if (p->cmd == cmd)
2197 return p->func(client, arg);
2198 }
2199 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2200 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2201 return -ENOTTY;
2202 }
2203
2204
2205 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2206 {
2207 struct snd_seq_client *client = file->private_data;
2208
2209 if (snd_BUG_ON(!client))
2210 return -ENXIO;
2211
2212 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2213 }
2214
2215 #ifdef CONFIG_COMPAT
2216 #include "seq_compat.c"
2217 #else
2218 #define snd_seq_ioctl_compat NULL
2219 #endif
2220
2221 /* -------------------------------------------------------- */
2222
2223
2224 /* exported to kernel modules */
2225 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2226 const char *name_fmt, ...)
2227 {
2228 struct snd_seq_client *client;
2229 va_list args;
2230
2231 if (snd_BUG_ON(in_interrupt()))
2232 return -EBUSY;
2233
2234 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2235 return -EINVAL;
2236 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2237 return -EINVAL;
2238
2239 if (mutex_lock_interruptible(&register_mutex))
2240 return -ERESTARTSYS;
2241
2242 if (card) {
2243 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2244 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2245 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2246 client_index = -1;
2247 }
2248
2249 /* empty write queue as default */
2250 client = seq_create_client1(client_index, 0);
2251 if (client == NULL) {
2252 mutex_unlock(&register_mutex);
2253 return -EBUSY; /* failure code */
2254 }
2255 usage_alloc(&client_usage, 1);
2256
2257 client->accept_input = 1;
2258 client->accept_output = 1;
2259
2260 va_start(args, name_fmt);
2261 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2262 va_end(args);
2263
2264 client->type = KERNEL_CLIENT;
2265 mutex_unlock(&register_mutex);
2266
2267 /* make others aware this new client */
2268 snd_seq_system_client_ev_client_start(client->number);
2269
2270 /* return client number to caller */
2271 return client->number;
2272 }
2273
2274 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2275
2276 /* exported to kernel modules */
2277 int snd_seq_delete_kernel_client(int client)
2278 {
2279 struct snd_seq_client *ptr;
2280
2281 if (snd_BUG_ON(in_interrupt()))
2282 return -EBUSY;
2283
2284 ptr = clientptr(client);
2285 if (ptr == NULL)
2286 return -EINVAL;
2287
2288 seq_free_client(ptr);
2289 kfree(ptr);
2290 return 0;
2291 }
2292
2293 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2294
2295 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2296 * and snd_seq_kernel_client_enqueue_blocking
2297 */
2298 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2299 struct file *file, int blocking,
2300 int atomic, int hop)
2301 {
2302 struct snd_seq_client *cptr;
2303 int result;
2304
2305 if (snd_BUG_ON(!ev))
2306 return -EINVAL;
2307
2308 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2309 return 0; /* ignore this */
2310 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2311 return -EINVAL; /* quoted events can't be enqueued */
2312
2313 /* fill in client number */
2314 ev->source.client = client;
2315
2316 if (check_event_type_and_length(ev))
2317 return -EINVAL;
2318
2319 cptr = snd_seq_client_use_ptr(client);
2320 if (cptr == NULL)
2321 return -EINVAL;
2322
2323 if (! cptr->accept_output)
2324 result = -EPERM;
2325 else /* send it */
2326 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2327
2328 snd_seq_client_unlock(cptr);
2329 return result;
2330 }
2331
2332 /*
2333 * exported, called by kernel clients to enqueue events (w/o blocking)
2334 *
2335 * RETURN VALUE: zero if succeed, negative if error
2336 */
2337 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2338 int atomic, int hop)
2339 {
2340 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2341 }
2342
2343 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2344
2345 /*
2346 * exported, called by kernel clients to enqueue events (with blocking)
2347 *
2348 * RETURN VALUE: zero if succeed, negative if error
2349 */
2350 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2351 struct file *file,
2352 int atomic, int hop)
2353 {
2354 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2355 }
2356
2357 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2358
2359 /*
2360 * exported, called by kernel clients to dispatch events directly to other
2361 * clients, bypassing the queues. Event time-stamp will be updated.
2362 *
2363 * RETURN VALUE: negative = delivery failed,
2364 * zero, or positive: the number of delivered events
2365 */
2366 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2367 int atomic, int hop)
2368 {
2369 struct snd_seq_client *cptr;
2370 int result;
2371
2372 if (snd_BUG_ON(!ev))
2373 return -EINVAL;
2374
2375 /* fill in client number */
2376 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2377 ev->source.client = client;
2378
2379 if (check_event_type_and_length(ev))
2380 return -EINVAL;
2381
2382 cptr = snd_seq_client_use_ptr(client);
2383 if (cptr == NULL)
2384 return -EINVAL;
2385
2386 if (!cptr->accept_output)
2387 result = -EPERM;
2388 else
2389 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2390
2391 snd_seq_client_unlock(cptr);
2392 return result;
2393 }
2394
2395 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2396
2397 /*
2398 * exported, called by kernel clients to perform same functions as with
2399 * userland ioctl()
2400 */
2401 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2402 {
2403 struct snd_seq_client *client;
2404 mm_segment_t fs;
2405 int result;
2406
2407 client = clientptr(clientid);
2408 if (client == NULL)
2409 return -ENXIO;
2410 fs = snd_enter_user();
2411 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2412 snd_leave_user(fs);
2413 return result;
2414 }
2415
2416 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2417
2418 /* exported (for OSS emulator) */
2419 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2420 {
2421 struct snd_seq_client *client;
2422
2423 client = clientptr(clientid);
2424 if (client == NULL)
2425 return -ENXIO;
2426
2427 if (! snd_seq_write_pool_allocated(client))
2428 return 1;
2429 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2430 return 1;
2431 return 0;
2432 }
2433
2434 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2435
2436 /*---------------------------------------------------------------------------*/
2437
2438 #ifdef CONFIG_PROC_FS
2439 /*
2440 * /proc interface
2441 */
2442 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2443 struct snd_seq_port_subs_info *group,
2444 int is_src, char *msg)
2445 {
2446 struct list_head *p;
2447 struct snd_seq_subscribers *s;
2448 int count = 0;
2449
2450 down_read(&group->list_mutex);
2451 if (list_empty(&group->list_head)) {
2452 up_read(&group->list_mutex);
2453 return;
2454 }
2455 snd_iprintf(buffer, msg);
2456 list_for_each(p, &group->list_head) {
2457 if (is_src)
2458 s = list_entry(p, struct snd_seq_subscribers, src_list);
2459 else
2460 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2461 if (count++)
2462 snd_iprintf(buffer, ", ");
2463 snd_iprintf(buffer, "%d:%d",
2464 is_src ? s->info.dest.client : s->info.sender.client,
2465 is_src ? s->info.dest.port : s->info.sender.port);
2466 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2467 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2468 if (group->exclusive)
2469 snd_iprintf(buffer, "[ex]");
2470 }
2471 up_read(&group->list_mutex);
2472 snd_iprintf(buffer, "\n");
2473 }
2474
2475 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2476 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2477 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2478
2479 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2480
2481 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2482 struct snd_seq_client *client)
2483 {
2484 struct snd_seq_client_port *p;
2485
2486 mutex_lock(&client->ports_mutex);
2487 list_for_each_entry(p, &client->ports_list_head, list) {
2488 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2489 p->addr.port, p->name,
2490 FLAG_PERM_RD(p->capability),
2491 FLAG_PERM_WR(p->capability),
2492 FLAG_PERM_EX(p->capability),
2493 FLAG_PERM_DUPLEX(p->capability));
2494 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2495 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2496 }
2497 mutex_unlock(&client->ports_mutex);
2498 }
2499
2500
2501 /* exported to seq_info.c */
2502 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2503 struct snd_info_buffer *buffer)
2504 {
2505 int c;
2506 struct snd_seq_client *client;
2507
2508 snd_iprintf(buffer, "Client info\n");
2509 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2510 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2511 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2512 snd_iprintf(buffer, "\n");
2513
2514 /* list the client table */
2515 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2516 client = snd_seq_client_use_ptr(c);
2517 if (client == NULL)
2518 continue;
2519 if (client->type == NO_CLIENT) {
2520 snd_seq_client_unlock(client);
2521 continue;
2522 }
2523
2524 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2525 c, client->name,
2526 client->type == USER_CLIENT ? "User" : "Kernel");
2527 snd_seq_info_dump_ports(buffer, client);
2528 if (snd_seq_write_pool_allocated(client)) {
2529 snd_iprintf(buffer, " Output pool :\n");
2530 snd_seq_info_pool(buffer, client->pool, " ");
2531 }
2532 if (client->type == USER_CLIENT && client->data.user.fifo &&
2533 client->data.user.fifo->pool) {
2534 snd_iprintf(buffer, " Input pool :\n");
2535 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2536 }
2537 snd_seq_client_unlock(client);
2538 }
2539 }
2540 #endif /* CONFIG_PROC_FS */
2541
2542 /*---------------------------------------------------------------------------*/
2543
2544
2545 /*
2546 * REGISTRATION PART
2547 */
2548
2549 static const struct file_operations snd_seq_f_ops =
2550 {
2551 .owner = THIS_MODULE,
2552 .read = snd_seq_read,
2553 .write = snd_seq_write,
2554 .open = snd_seq_open,
2555 .release = snd_seq_release,
2556 .llseek = no_llseek,
2557 .poll = snd_seq_poll,
2558 .unlocked_ioctl = snd_seq_ioctl,
2559 .compat_ioctl = snd_seq_ioctl_compat,
2560 };
2561
2562 /*
2563 * register sequencer device
2564 */
2565 int __init snd_sequencer_device_init(void)
2566 {
2567 int err;
2568
2569 if (mutex_lock_interruptible(&register_mutex))
2570 return -ERESTARTSYS;
2571
2572 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2573 &snd_seq_f_ops, NULL, "seq")) < 0) {
2574 mutex_unlock(&register_mutex);
2575 return err;
2576 }
2577
2578 mutex_unlock(&register_mutex);
2579
2580 return 0;
2581 }
2582
2583
2584
2585 /*
2586 * unregister sequencer device
2587 */
2588 void __exit snd_sequencer_device_done(void)
2589 {
2590 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2591 }