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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[cris-mirror.git] / sound / core / seq / seq_clientmgr.c
blobf2436d33fbf7182a62ae1bc1744a41f8bdb385ce
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/slab.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <linux/kmod.h>
29
30 #include <sound/seq_kernel.h>
31 #include "seq_clientmgr.h"
32 #include "seq_memory.h"
33 #include "seq_queue.h"
34 #include "seq_timer.h"
35 #include "seq_info.h"
36 #include "seq_system.h"
37 #include <sound/seq_device.h>
38 #ifdef CONFIG_COMPAT
39 #include <linux/compat.h>
40 #endif
41
42 /* Client Manager
43
44 * this module handles the connections of userland and kernel clients
45 *
46 */
47
48 /*
49 * There are four ranges of client numbers (last two shared):
50 * 0..15: global clients
51 * 16..127: statically allocated client numbers for cards 0..27
52 * 128..191: dynamically allocated client numbers for cards 28..31
53 * 128..191: dynamically allocated client numbers for applications
54 */
55
56 /* number of kernel non-card clients */
57 #define SNDRV_SEQ_GLOBAL_CLIENTS 16
58 /* clients per cards, for static clients */
59 #define SNDRV_SEQ_CLIENTS_PER_CARD 4
60 /* dynamically allocated client numbers (both kernel drivers and user space) */
61 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
62
63 #define SNDRV_SEQ_LFLG_INPUT 0x0001
64 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
65 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
66
67 static DEFINE_SPINLOCK(clients_lock);
68 static DEFINE_MUTEX(register_mutex);
69
70 /*
71 * client table
72 */
73 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
74 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
75 static struct snd_seq_usage client_usage;
76
77 /*
78 * prototypes
79 */
80 static int bounce_error_event(struct snd_seq_client *client,
81 struct snd_seq_event *event,
82 int err, int atomic, int hop);
83 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
84 struct snd_seq_event *event,
85 int filter, int atomic, int hop);
86
87 /*
88 */
89
90 static inline mm_segment_t snd_enter_user(void)
91 {
92 mm_segment_t fs = get_fs();
93 set_fs(get_ds());
94 return fs;
95 }
96
97 static inline void snd_leave_user(mm_segment_t fs)
98 {
99 set_fs(fs);
100 }
101
102 /*
103 */
104 static inline unsigned short snd_seq_file_flags(struct file *file)
105 {
106 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
107 case FMODE_WRITE:
108 return SNDRV_SEQ_LFLG_OUTPUT;
109 case FMODE_READ:
110 return SNDRV_SEQ_LFLG_INPUT;
111 default:
112 return SNDRV_SEQ_LFLG_OPEN;
113 }
114 }
115
116 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
117 {
118 return snd_seq_total_cells(client->pool) > 0;
119 }
120
121 /* return pointer to client structure for specified id */
122 static struct snd_seq_client *clientptr(int clientid)
123 {
124 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
125 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
126 clientid);
127 return NULL;
128 }
129 return clienttab[clientid];
130 }
131
132 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
133 {
134 unsigned long flags;
135 struct snd_seq_client *client;
136
137 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
138 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
139 clientid);
140 return NULL;
141 }
142 spin_lock_irqsave(&clients_lock, flags);
143 client = clientptr(clientid);
144 if (client)
145 goto __lock;
146 if (clienttablock[clientid]) {
147 spin_unlock_irqrestore(&clients_lock, flags);
148 return NULL;
149 }
150 spin_unlock_irqrestore(&clients_lock, flags);
151 #ifdef CONFIG_MODULES
152 if (!in_interrupt()) {
153 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
154 static char card_requested[SNDRV_CARDS];
155 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
156 int idx;
157
158 if (!client_requested[clientid]) {
159 client_requested[clientid] = 1;
160 for (idx = 0; idx < 15; idx++) {
161 if (seq_client_load[idx] < 0)
162 break;
163 if (seq_client_load[idx] == clientid) {
164 request_module("snd-seq-client-%i",
165 clientid);
166 break;
167 }
168 }
169 }
170 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
171 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
172 SNDRV_SEQ_CLIENTS_PER_CARD;
173 if (card < snd_ecards_limit) {
174 if (! card_requested[card]) {
175 card_requested[card] = 1;
176 snd_request_card(card);
177 }
178 snd_seq_device_load_drivers();
179 }
180 }
181 spin_lock_irqsave(&clients_lock, flags);
182 client = clientptr(clientid);
183 if (client)
184 goto __lock;
185 spin_unlock_irqrestore(&clients_lock, flags);
186 }
187 #endif
188 return NULL;
189
190 __lock:
191 snd_use_lock_use(&client->use_lock);
192 spin_unlock_irqrestore(&clients_lock, flags);
193 return client;
194 }
195
196 static void usage_alloc(struct snd_seq_usage *res, int num)
197 {
198 res->cur += num;
199 if (res->cur > res->peak)
200 res->peak = res->cur;
201 }
202
203 static void usage_free(struct snd_seq_usage *res, int num)
204 {
205 res->cur -= num;
206 }
207
208 /* initialise data structures */
209 int __init client_init_data(void)
210 {
211 /* zap out the client table */
212 memset(&clienttablock, 0, sizeof(clienttablock));
213 memset(&clienttab, 0, sizeof(clienttab));
214 return 0;
215 }
216
217
218 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
219 {
220 unsigned long flags;
221 int c;
222 struct snd_seq_client *client;
223
224 /* init client data */
225 client = kzalloc(sizeof(*client), GFP_KERNEL);
226 if (client == NULL)
227 return NULL;
228 client->pool = snd_seq_pool_new(poolsize);
229 if (client->pool == NULL) {
230 kfree(client);
231 return NULL;
232 }
233 client->type = NO_CLIENT;
234 snd_use_lock_init(&client->use_lock);
235 rwlock_init(&client->ports_lock);
236 mutex_init(&client->ports_mutex);
237 INIT_LIST_HEAD(&client->ports_list_head);
238
239 /* find free slot in the client table */
240 spin_lock_irqsave(&clients_lock, flags);
241 if (client_index < 0) {
242 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
243 c < SNDRV_SEQ_MAX_CLIENTS;
244 c++) {
245 if (clienttab[c] || clienttablock[c])
246 continue;
247 clienttab[client->number = c] = client;
248 spin_unlock_irqrestore(&clients_lock, flags);
249 return client;
250 }
251 } else {
252 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
253 clienttab[client->number = client_index] = client;
254 spin_unlock_irqrestore(&clients_lock, flags);
255 return client;
256 }
257 }
258 spin_unlock_irqrestore(&clients_lock, flags);
259 snd_seq_pool_delete(&client->pool);
260 kfree(client);
261 return NULL; /* no free slot found or busy, return failure code */
262 }
263
264
265 static int seq_free_client1(struct snd_seq_client *client)
266 {
267 unsigned long flags;
268
269 if (!client)
270 return 0;
271 snd_seq_delete_all_ports(client);
272 snd_seq_queue_client_leave(client->number);
273 spin_lock_irqsave(&clients_lock, flags);
274 clienttablock[client->number] = 1;
275 clienttab[client->number] = NULL;
276 spin_unlock_irqrestore(&clients_lock, flags);
277 snd_use_lock_sync(&client->use_lock);
278 snd_seq_queue_client_termination(client->number);
279 if (client->pool)
280 snd_seq_pool_delete(&client->pool);
281 spin_lock_irqsave(&clients_lock, flags);
282 clienttablock[client->number] = 0;
283 spin_unlock_irqrestore(&clients_lock, flags);
284 return 0;
285 }
286
287
288 static void seq_free_client(struct snd_seq_client * client)
289 {
290 mutex_lock(&register_mutex);
291 switch (client->type) {
292 case NO_CLIENT:
293 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
294 client->number);
295 break;
296 case USER_CLIENT:
297 case KERNEL_CLIENT:
298 seq_free_client1(client);
299 usage_free(&client_usage, 1);
300 break;
301
302 default:
303 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
304 client->number, client->type);
305 }
306 mutex_unlock(&register_mutex);
307
308 snd_seq_system_client_ev_client_exit(client->number);
309 }
310
311
312
313 /* -------------------------------------------------------- */
314
315 /* create a user client */
316 static int snd_seq_open(struct inode *inode, struct file *file)
317 {
318 int c, mode; /* client id */
319 struct snd_seq_client *client;
320 struct snd_seq_user_client *user;
321 int err;
322
323 err = nonseekable_open(inode, file);
324 if (err < 0)
325 return err;
326
327 if (mutex_lock_interruptible(&register_mutex))
328 return -ERESTARTSYS;
329 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
330 if (client == NULL) {
331 mutex_unlock(&register_mutex);
332 return -ENOMEM; /* failure code */
333 }
334
335 mode = snd_seq_file_flags(file);
336 if (mode & SNDRV_SEQ_LFLG_INPUT)
337 client->accept_input = 1;
338 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
339 client->accept_output = 1;
340
341 user = &client->data.user;
342 user->fifo = NULL;
343 user->fifo_pool_size = 0;
344
345 if (mode & SNDRV_SEQ_LFLG_INPUT) {
346 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
347 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
348 if (user->fifo == NULL) {
349 seq_free_client1(client);
350 kfree(client);
351 mutex_unlock(&register_mutex);
352 return -ENOMEM;
353 }
354 }
355
356 usage_alloc(&client_usage, 1);
357 client->type = USER_CLIENT;
358 mutex_unlock(&register_mutex);
359
360 c = client->number;
361 file->private_data = client;
362
363 /* fill client data */
364 user->file = file;
365 sprintf(client->name, "Client-%d", c);
366
367 /* make others aware this new client */
368 snd_seq_system_client_ev_client_start(c);
369
370 return 0;
371 }
372
373 /* delete a user client */
374 static int snd_seq_release(struct inode *inode, struct file *file)
375 {
376 struct snd_seq_client *client = file->private_data;
377
378 if (client) {
379 seq_free_client(client);
380 if (client->data.user.fifo)
381 snd_seq_fifo_delete(&client->data.user.fifo);
382 kfree(client);
383 }
384
385 return 0;
386 }
387
388
389 /* handle client read() */
390 /* possible error values:
391 * -ENXIO invalid client or file open mode
392 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
393 * -EINVAL no enough user-space buffer to write the whole event
394 * -EFAULT seg. fault during copy to user space
395 */
396 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
397 loff_t *offset)
398 {
399 struct snd_seq_client *client = file->private_data;
400 struct snd_seq_fifo *fifo;
401 int err;
402 long result = 0;
403 struct snd_seq_event_cell *cell;
404
405 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
406 return -ENXIO;
407
408 if (!access_ok(VERIFY_WRITE, buf, count))
409 return -EFAULT;
410
411 /* check client structures are in place */
412 if (snd_BUG_ON(!client))
413 return -ENXIO;
414
415 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
416 return -ENXIO;
417
418 if (atomic_read(&fifo->overflow) > 0) {
419 /* buffer overflow is detected */
420 snd_seq_fifo_clear(fifo);
421 /* return error code */
422 return -ENOSPC;
423 }
424
425 cell = NULL;
426 err = 0;
427 snd_seq_fifo_lock(fifo);
428
429 /* while data available in queue */
430 while (count >= sizeof(struct snd_seq_event)) {
431 int nonblock;
432
433 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
434 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
435 break;
436 }
437 if (snd_seq_ev_is_variable(&cell->event)) {
438 struct snd_seq_event tmpev;
439 tmpev = cell->event;
440 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
441 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
442 err = -EFAULT;
443 break;
444 }
445 count -= sizeof(struct snd_seq_event);
446 buf += sizeof(struct snd_seq_event);
447 err = snd_seq_expand_var_event(&cell->event, count,
448 (char __force *)buf, 0,
449 sizeof(struct snd_seq_event));
450 if (err < 0)
451 break;
452 result += err;
453 count -= err;
454 buf += err;
455 } else {
456 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
457 err = -EFAULT;
458 break;
459 }
460 count -= sizeof(struct snd_seq_event);
461 buf += sizeof(struct snd_seq_event);
462 }
463 snd_seq_cell_free(cell);
464 cell = NULL; /* to be sure */
465 result += sizeof(struct snd_seq_event);
466 }
467
468 if (err < 0) {
469 if (cell)
470 snd_seq_fifo_cell_putback(fifo, cell);
471 if (err == -EAGAIN && result > 0)
472 err = 0;
473 }
474 snd_seq_fifo_unlock(fifo);
475
476 return (err < 0) ? err : result;
477 }
478
479
480 /*
481 * check access permission to the port
482 */
483 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
484 {
485 if ((port->capability & flags) != flags)
486 return 0;
487 return flags;
488 }
489
490 /*
491 * check if the destination client is available, and return the pointer
492 * if filter is non-zero, client filter bitmap is tested.
493 */
494 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
495 int filter)
496 {
497 struct snd_seq_client *dest;
498
499 dest = snd_seq_client_use_ptr(event->dest.client);
500 if (dest == NULL)
501 return NULL;
502 if (! dest->accept_input)
503 goto __not_avail;
504 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
505 ! test_bit(event->type, dest->event_filter))
506 goto __not_avail;
507 if (filter && !(dest->filter & filter))
508 goto __not_avail;
509
510 return dest; /* ok - accessible */
511 __not_avail:
512 snd_seq_client_unlock(dest);
513 return NULL;
514 }
515
516
517 /*
518 * Return the error event.
519 *
520 * If the receiver client is a user client, the original event is
521 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
522 * the original event is also variable length, the external data is
523 * copied after the event record.
524 * If the receiver client is a kernel client, the original event is
525 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
526 * kmalloc.
527 */
528 static int bounce_error_event(struct snd_seq_client *client,
529 struct snd_seq_event *event,
530 int err, int atomic, int hop)
531 {
532 struct snd_seq_event bounce_ev;
533 int result;
534
535 if (client == NULL ||
536 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
537 ! client->accept_input)
538 return 0; /* ignored */
539
540 /* set up quoted error */
541 memset(&bounce_ev, 0, sizeof(bounce_ev));
542 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
543 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
544 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
545 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
546 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
547 bounce_ev.dest.client = client->number;
548 bounce_ev.dest.port = event->source.port;
549 bounce_ev.data.quote.origin = event->dest;
550 bounce_ev.data.quote.event = event;
551 bounce_ev.data.quote.value = -err; /* use positive value */
552 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
553 if (result < 0) {
554 client->event_lost++;
555 return result;
556 }
557
558 return result;
559 }
560
561
562 /*
563 * rewrite the time-stamp of the event record with the curren time
564 * of the given queue.
565 * return non-zero if updated.
566 */
567 static int update_timestamp_of_queue(struct snd_seq_event *event,
568 int queue, int real_time)
569 {
570 struct snd_seq_queue *q;
571
572 q = queueptr(queue);
573 if (! q)
574 return 0;
575 event->queue = queue;
576 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
577 if (real_time) {
578 event->time.time = snd_seq_timer_get_cur_time(q->timer);
579 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
580 } else {
581 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
582 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
583 }
584 queuefree(q);
585 return 1;
586 }
587
588
589 /*
590 * deliver an event to the specified destination.
591 * if filter is non-zero, client filter bitmap is tested.
592 *
593 * RETURN VALUE: 0 : if succeeded
594 * <0 : error
595 */
596 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
597 struct snd_seq_event *event,
598 int filter, int atomic, int hop)
599 {
600 struct snd_seq_client *dest = NULL;
601 struct snd_seq_client_port *dest_port = NULL;
602 int result = -ENOENT;
603 int direct;
604
605 direct = snd_seq_ev_is_direct(event);
606
607 dest = get_event_dest_client(event, filter);
608 if (dest == NULL)
609 goto __skip;
610 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
611 if (dest_port == NULL)
612 goto __skip;
613
614 /* check permission */
615 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
616 result = -EPERM;
617 goto __skip;
618 }
619
620 if (dest_port->timestamping)
621 update_timestamp_of_queue(event, dest_port->time_queue,
622 dest_port->time_real);
623
624 switch (dest->type) {
625 case USER_CLIENT:
626 if (dest->data.user.fifo)
627 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
628 break;
629
630 case KERNEL_CLIENT:
631 if (dest_port->event_input == NULL)
632 break;
633 result = dest_port->event_input(event, direct,
634 dest_port->private_data,
635 atomic, hop);
636 break;
637 default:
638 break;
639 }
640
641 __skip:
642 if (dest_port)
643 snd_seq_port_unlock(dest_port);
644 if (dest)
645 snd_seq_client_unlock(dest);
646
647 if (result < 0 && !direct) {
648 result = bounce_error_event(client, event, result, atomic, hop);
649 }
650 return result;
651 }
652
653
654 /*
655 * send the event to all subscribers:
656 */
657 static int deliver_to_subscribers(struct snd_seq_client *client,
658 struct snd_seq_event *event,
659 int atomic, int hop)
660 {
661 struct snd_seq_subscribers *subs;
662 int err = 0, num_ev = 0;
663 struct snd_seq_event event_saved;
664 struct snd_seq_client_port *src_port;
665 struct snd_seq_port_subs_info *grp;
666
667 src_port = snd_seq_port_use_ptr(client, event->source.port);
668 if (src_port == NULL)
669 return -EINVAL; /* invalid source port */
670 /* save original event record */
671 event_saved = *event;
672 grp = &src_port->c_src;
673
674 /* lock list */
675 if (atomic)
676 read_lock(&grp->list_lock);
677 else
678 down_read(&grp->list_mutex);
679 list_for_each_entry(subs, &grp->list_head, src_list) {
680 event->dest = subs->info.dest;
681 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
682 /* convert time according to flag with subscription */
683 update_timestamp_of_queue(event, subs->info.queue,
684 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
685 err = snd_seq_deliver_single_event(client, event,
686 0, atomic, hop);
687 if (err < 0)
688 break;
689 num_ev++;
690 /* restore original event record */
691 *event = event_saved;
692 }
693 if (atomic)
694 read_unlock(&grp->list_lock);
695 else
696 up_read(&grp->list_mutex);
697 *event = event_saved; /* restore */
698 snd_seq_port_unlock(src_port);
699 return (err < 0) ? err : num_ev;
700 }
701
702
703 #ifdef SUPPORT_BROADCAST
704 /*
705 * broadcast to all ports:
706 */
707 static int port_broadcast_event(struct snd_seq_client *client,
708 struct snd_seq_event *event,
709 int atomic, int hop)
710 {
711 int num_ev = 0, err = 0;
712 struct snd_seq_client *dest_client;
713 struct snd_seq_client_port *port;
714
715 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
716 if (dest_client == NULL)
717 return 0; /* no matching destination */
718
719 read_lock(&dest_client->ports_lock);
720 list_for_each_entry(port, &dest_client->ports_list_head, list) {
721 event->dest.port = port->addr.port;
722 /* pass NULL as source client to avoid error bounce */
723 err = snd_seq_deliver_single_event(NULL, event,
724 SNDRV_SEQ_FILTER_BROADCAST,
725 atomic, hop);
726 if (err < 0)
727 break;
728 num_ev++;
729 }
730 read_unlock(&dest_client->ports_lock);
731 snd_seq_client_unlock(dest_client);
732 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
733 return (err < 0) ? err : num_ev;
734 }
735
736 /*
737 * send the event to all clients:
738 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
739 */
740 static int broadcast_event(struct snd_seq_client *client,
741 struct snd_seq_event *event, int atomic, int hop)
742 {
743 int err = 0, num_ev = 0;
744 int dest;
745 struct snd_seq_addr addr;
746
747 addr = event->dest; /* save */
748
749 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
750 /* don't send to itself */
751 if (dest == client->number)
752 continue;
753 event->dest.client = dest;
754 event->dest.port = addr.port;
755 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
756 err = port_broadcast_event(client, event, atomic, hop);
757 else
758 /* pass NULL as source client to avoid error bounce */
759 err = snd_seq_deliver_single_event(NULL, event,
760 SNDRV_SEQ_FILTER_BROADCAST,
761 atomic, hop);
762 if (err < 0)
763 break;
764 num_ev += err;
765 }
766 event->dest = addr; /* restore */
767 return (err < 0) ? err : num_ev;
768 }
769
770
771 /* multicast - not supported yet */
772 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
773 int atomic, int hop)
774 {
775 snd_printd("seq: multicast not supported yet.\n");
776 return 0; /* ignored */
777 }
778 #endif /* SUPPORT_BROADCAST */
779
780
781 /* deliver an event to the destination port(s).
782 * if the event is to subscribers or broadcast, the event is dispatched
783 * to multiple targets.
784 *
785 * RETURN VALUE: n > 0 : the number of delivered events.
786 * n == 0 : the event was not passed to any client.
787 * n < 0 : error - event was not processed.
788 */
789 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
790 int atomic, int hop)
791 {
792 int result;
793
794 hop++;
795 if (hop >= SNDRV_SEQ_MAX_HOPS) {
796 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
797 event->source.client, event->source.port,
798 event->dest.client, event->dest.port);
799 return -EMLINK;
800 }
801
802 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
803 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
804 result = deliver_to_subscribers(client, event, atomic, hop);
805 #ifdef SUPPORT_BROADCAST
806 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
807 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
808 result = broadcast_event(client, event, atomic, hop);
809 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
810 result = multicast_event(client, event, atomic, hop);
811 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
812 result = port_broadcast_event(client, event, atomic, hop);
813 #endif
814 else
815 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
816
817 return result;
818 }
819
820 /*
821 * dispatch an event cell:
822 * This function is called only from queue check routines in timer
823 * interrupts or after enqueued.
824 * The event cell shall be released or re-queued in this function.
825 *
826 * RETURN VALUE: n > 0 : the number of delivered events.
827 * n == 0 : the event was not passed to any client.
828 * n < 0 : error - event was not processed.
829 */
830 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
831 {
832 struct snd_seq_client *client;
833 int result;
834
835 if (snd_BUG_ON(!cell))
836 return -EINVAL;
837
838 client = snd_seq_client_use_ptr(cell->event.source.client);
839 if (client == NULL) {
840 snd_seq_cell_free(cell); /* release this cell */
841 return -EINVAL;
842 }
843
844 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
845 /* NOTE event:
846 * the event cell is re-used as a NOTE-OFF event and
847 * enqueued again.
848 */
849 struct snd_seq_event tmpev, *ev;
850
851 /* reserve this event to enqueue note-off later */
852 tmpev = cell->event;
853 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
854 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
855
856 /*
857 * This was originally a note event. We now re-use the
858 * cell for the note-off event.
859 */
860
861 ev = &cell->event;
862 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
863 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
864
865 /* add the duration time */
866 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
867 case SNDRV_SEQ_TIME_STAMP_TICK:
868 ev->time.tick += ev->data.note.duration;
869 break;
870 case SNDRV_SEQ_TIME_STAMP_REAL:
871 /* unit for duration is ms */
872 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
873 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
874 ev->time.time.tv_nsec / 1000000000;
875 ev->time.time.tv_nsec %= 1000000000;
876 break;
877 }
878 ev->data.note.velocity = ev->data.note.off_velocity;
879
880 /* Now queue this cell as the note off event */
881 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
882 snd_seq_cell_free(cell); /* release this cell */
883
884 } else {
885 /* Normal events:
886 * event cell is freed after processing the event
887 */
888
889 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
890 snd_seq_cell_free(cell);
891 }
892
893 snd_seq_client_unlock(client);
894 return result;
895 }
896
897
898 /* Allocate a cell from client pool and enqueue it to queue:
899 * if pool is empty and blocking is TRUE, sleep until a new cell is
900 * available.
901 */
902 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
903 struct snd_seq_event *event,
904 struct file *file, int blocking,
905 int atomic, int hop)
906 {
907 struct snd_seq_event_cell *cell;
908 int err;
909
910 /* special queue values - force direct passing */
911 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
912 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
913 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
914 } else
915 #ifdef SUPPORT_BROADCAST
916 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
917 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
918 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
919 }
920 #endif
921 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
922 /* check presence of source port */
923 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
924 if (src_port == NULL)
925 return -EINVAL;
926 snd_seq_port_unlock(src_port);
927 }
928
929 /* direct event processing without enqueued */
930 if (snd_seq_ev_is_direct(event)) {
931 if (event->type == SNDRV_SEQ_EVENT_NOTE)
932 return -EINVAL; /* this event must be enqueued! */
933 return snd_seq_deliver_event(client, event, atomic, hop);
934 }
935
936 /* Not direct, normal queuing */
937 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
938 return -EINVAL; /* invalid queue */
939 if (! snd_seq_write_pool_allocated(client))
940 return -ENXIO; /* queue is not allocated */
941
942 /* allocate an event cell */
943 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
944 if (err < 0)
945 return err;
946
947 /* we got a cell. enqueue it. */
948 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
949 snd_seq_cell_free(cell);
950 return err;
951 }
952
953 return 0;
954 }
955
956
957 /*
958 * check validity of event type and data length.
959 * return non-zero if invalid.
960 */
961 static int check_event_type_and_length(struct snd_seq_event *ev)
962 {
963 switch (snd_seq_ev_length_type(ev)) {
964 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
965 if (snd_seq_ev_is_variable_type(ev))
966 return -EINVAL;
967 break;
968 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
969 if (! snd_seq_ev_is_variable_type(ev) ||
970 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
971 return -EINVAL;
972 break;
973 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
974 if (! snd_seq_ev_is_direct(ev))
975 return -EINVAL;
976 break;
977 }
978 return 0;
979 }
980
981
982 /* handle write() */
983 /* possible error values:
984 * -ENXIO invalid client or file open mode
985 * -ENOMEM malloc failed
986 * -EFAULT seg. fault during copy from user space
987 * -EINVAL invalid event
988 * -EAGAIN no space in output pool
989 * -EINTR interrupts while sleep
990 * -EMLINK too many hops
991 * others depends on return value from driver callback
992 */
993 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
994 size_t count, loff_t *offset)
995 {
996 struct snd_seq_client *client = file->private_data;
997 int written = 0, len;
998 int err = -EINVAL;
999 struct snd_seq_event event;
1000
1001 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1002 return -ENXIO;
1003
1004 /* check client structures are in place */
1005 if (snd_BUG_ON(!client))
1006 return -ENXIO;
1007
1008 if (!client->accept_output || client->pool == NULL)
1009 return -ENXIO;
1010
1011 /* allocate the pool now if the pool is not allocated yet */
1012 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1013 if (snd_seq_pool_init(client->pool) < 0)
1014 return -ENOMEM;
1015 }
1016
1017 /* only process whole events */
1018 while (count >= sizeof(struct snd_seq_event)) {
1019 /* Read in the event header from the user */
1020 len = sizeof(event);
1021 if (copy_from_user(&event, buf, len)) {
1022 err = -EFAULT;
1023 break;
1024 }
1025 event.source.client = client->number; /* fill in client number */
1026 /* Check for extension data length */
1027 if (check_event_type_and_length(&event)) {
1028 err = -EINVAL;
1029 break;
1030 }
1031
1032 /* check for special events */
1033 if (event.type == SNDRV_SEQ_EVENT_NONE)
1034 goto __skip_event;
1035 else if (snd_seq_ev_is_reserved(&event)) {
1036 err = -EINVAL;
1037 break;
1038 }
1039
1040 if (snd_seq_ev_is_variable(&event)) {
1041 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1042 if ((size_t)(extlen + len) > count) {
1043 /* back out, will get an error this time or next */
1044 err = -EINVAL;
1045 break;
1046 }
1047 /* set user space pointer */
1048 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1049 event.data.ext.ptr = (char __force *)buf
1050 + sizeof(struct snd_seq_event);
1051 len += extlen; /* increment data length */
1052 } else {
1053 #ifdef CONFIG_COMPAT
1054 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1055 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1056 event.data.ext.ptr = ptr;
1057 }
1058 #endif
1059 }
1060
1061 /* ok, enqueue it */
1062 err = snd_seq_client_enqueue_event(client, &event, file,
1063 !(file->f_flags & O_NONBLOCK),
1064 0, 0);
1065 if (err < 0)
1066 break;
1067
1068 __skip_event:
1069 /* Update pointers and counts */
1070 count -= len;
1071 buf += len;
1072 written += len;
1073 }
1074
1075 return written ? written : err;
1076 }
1077
1078
1079 /*
1080 * handle polling
1081 */
1082 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1083 {
1084 struct snd_seq_client *client = file->private_data;
1085 unsigned int mask = 0;
1086
1087 /* check client structures are in place */
1088 if (snd_BUG_ON(!client))
1089 return -ENXIO;
1090
1091 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1092 client->data.user.fifo) {
1093
1094 /* check if data is available in the outqueue */
1095 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1096 mask |= POLLIN | POLLRDNORM;
1097 }
1098
1099 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1100
1101 /* check if data is available in the pool */
1102 if (!snd_seq_write_pool_allocated(client) ||
1103 snd_seq_pool_poll_wait(client->pool, file, wait))
1104 mask |= POLLOUT | POLLWRNORM;
1105 }
1106
1107 return mask;
1108 }
1109
1110
1111 /*-----------------------------------------------------*/
1112
1113
1114 /* SYSTEM_INFO ioctl() */
1115 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1116 {
1117 struct snd_seq_system_info info;
1118
1119 memset(&info, 0, sizeof(info));
1120 /* fill the info fields */
1121 info.queues = SNDRV_SEQ_MAX_QUEUES;
1122 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1123 info.ports = 256; /* fixed limit */
1124 info.channels = 256; /* fixed limit */
1125 info.cur_clients = client_usage.cur;
1126 info.cur_queues = snd_seq_queue_get_cur_queues();
1127
1128 if (copy_to_user(arg, &info, sizeof(info)))
1129 return -EFAULT;
1130 return 0;
1131 }
1132
1133
1134 /* RUNNING_MODE ioctl() */
1135 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1136 {
1137 struct snd_seq_running_info info;
1138 struct snd_seq_client *cptr;
1139 int err = 0;
1140
1141 if (copy_from_user(&info, arg, sizeof(info)))
1142 return -EFAULT;
1143
1144 /* requested client number */
1145 cptr = snd_seq_client_use_ptr(info.client);
1146 if (cptr == NULL)
1147 return -ENOENT; /* don't change !!! */
1148
1149 #ifdef SNDRV_BIG_ENDIAN
1150 if (! info.big_endian) {
1151 err = -EINVAL;
1152 goto __err;
1153 }
1154 #else
1155 if (info.big_endian) {
1156 err = -EINVAL;
1157 goto __err;
1158 }
1159
1160 #endif
1161 if (info.cpu_mode > sizeof(long)) {
1162 err = -EINVAL;
1163 goto __err;
1164 }
1165 cptr->convert32 = (info.cpu_mode < sizeof(long));
1166 __err:
1167 snd_seq_client_unlock(cptr);
1168 return err;
1169 }
1170
1171 /* CLIENT_INFO ioctl() */
1172 static void get_client_info(struct snd_seq_client *cptr,
1173 struct snd_seq_client_info *info)
1174 {
1175 info->client = cptr->number;
1176
1177 /* fill the info fields */
1178 info->type = cptr->type;
1179 strcpy(info->name, cptr->name);
1180 info->filter = cptr->filter;
1181 info->event_lost = cptr->event_lost;
1182 memcpy(info->event_filter, cptr->event_filter, 32);
1183 info->num_ports = cptr->num_ports;
1184 memset(info->reserved, 0, sizeof(info->reserved));
1185 }
1186
1187 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1188 void __user *arg)
1189 {
1190 struct snd_seq_client *cptr;
1191 struct snd_seq_client_info client_info;
1192
1193 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1194 return -EFAULT;
1195
1196 /* requested client number */
1197 cptr = snd_seq_client_use_ptr(client_info.client);
1198 if (cptr == NULL)
1199 return -ENOENT; /* don't change !!! */
1200
1201 get_client_info(cptr, &client_info);
1202 snd_seq_client_unlock(cptr);
1203
1204 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1205 return -EFAULT;
1206 return 0;
1207 }
1208
1209
1210 /* CLIENT_INFO ioctl() */
1211 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1212 void __user *arg)
1213 {
1214 struct snd_seq_client_info client_info;
1215
1216 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1217 return -EFAULT;
1218
1219 /* it is not allowed to set the info fields for an another client */
1220 if (client->number != client_info.client)
1221 return -EPERM;
1222 /* also client type must be set now */
1223 if (client->type != client_info.type)
1224 return -EINVAL;
1225
1226 /* fill the info fields */
1227 if (client_info.name[0])
1228 strlcpy(client->name, client_info.name, sizeof(client->name));
1229
1230 client->filter = client_info.filter;
1231 client->event_lost = client_info.event_lost;
1232 memcpy(client->event_filter, client_info.event_filter, 32);
1233
1234 return 0;
1235 }
1236
1237
1238 /*
1239 * CREATE PORT ioctl()
1240 */
1241 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1242 void __user *arg)
1243 {
1244 struct snd_seq_client_port *port;
1245 struct snd_seq_port_info info;
1246 struct snd_seq_port_callback *callback;
1247
1248 if (copy_from_user(&info, arg, sizeof(info)))
1249 return -EFAULT;
1250
1251 /* it is not allowed to create the port for an another client */
1252 if (info.addr.client != client->number)
1253 return -EPERM;
1254
1255 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1256 if (port == NULL)
1257 return -ENOMEM;
1258
1259 if (client->type == USER_CLIENT && info.kernel) {
1260 snd_seq_delete_port(client, port->addr.port);
1261 return -EINVAL;
1262 }
1263 if (client->type == KERNEL_CLIENT) {
1264 if ((callback = info.kernel) != NULL) {
1265 if (callback->owner)
1266 port->owner = callback->owner;
1267 port->private_data = callback->private_data;
1268 port->private_free = callback->private_free;
1269 port->callback_all = callback->callback_all;
1270 port->event_input = callback->event_input;
1271 port->c_src.open = callback->subscribe;
1272 port->c_src.close = callback->unsubscribe;
1273 port->c_dest.open = callback->use;
1274 port->c_dest.close = callback->unuse;
1275 }
1276 }
1277
1278 info.addr = port->addr;
1279
1280 snd_seq_set_port_info(port, &info);
1281 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1282
1283 if (copy_to_user(arg, &info, sizeof(info)))
1284 return -EFAULT;
1285
1286 return 0;
1287 }
1288
1289 /*
1290 * DELETE PORT ioctl()
1291 */
1292 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1293 void __user *arg)
1294 {
1295 struct snd_seq_port_info info;
1296 int err;
1297
1298 /* set passed parameters */
1299 if (copy_from_user(&info, arg, sizeof(info)))
1300 return -EFAULT;
1301
1302 /* it is not allowed to remove the port for an another client */
1303 if (info.addr.client != client->number)
1304 return -EPERM;
1305
1306 err = snd_seq_delete_port(client, info.addr.port);
1307 if (err >= 0)
1308 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1309 return err;
1310 }
1311
1312
1313 /*
1314 * GET_PORT_INFO ioctl() (on any client)
1315 */
1316 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1317 void __user *arg)
1318 {
1319 struct snd_seq_client *cptr;
1320 struct snd_seq_client_port *port;
1321 struct snd_seq_port_info info;
1322
1323 if (copy_from_user(&info, arg, sizeof(info)))
1324 return -EFAULT;
1325 cptr = snd_seq_client_use_ptr(info.addr.client);
1326 if (cptr == NULL)
1327 return -ENXIO;
1328
1329 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1330 if (port == NULL) {
1331 snd_seq_client_unlock(cptr);
1332 return -ENOENT; /* don't change */
1333 }
1334
1335 /* get port info */
1336 snd_seq_get_port_info(port, &info);
1337 snd_seq_port_unlock(port);
1338 snd_seq_client_unlock(cptr);
1339
1340 if (copy_to_user(arg, &info, sizeof(info)))
1341 return -EFAULT;
1342 return 0;
1343 }
1344
1345
1346 /*
1347 * SET_PORT_INFO ioctl() (only ports on this/own client)
1348 */
1349 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1350 void __user *arg)
1351 {
1352 struct snd_seq_client_port *port;
1353 struct snd_seq_port_info info;
1354
1355 if (copy_from_user(&info, arg, sizeof(info)))
1356 return -EFAULT;
1357
1358 if (info.addr.client != client->number) /* only set our own ports ! */
1359 return -EPERM;
1360 port = snd_seq_port_use_ptr(client, info.addr.port);
1361 if (port) {
1362 snd_seq_set_port_info(port, &info);
1363 snd_seq_port_unlock(port);
1364 }
1365 return 0;
1366 }
1367
1368
1369 /*
1370 * port subscription (connection)
1371 */
1372 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1373 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1374
1375 static int check_subscription_permission(struct snd_seq_client *client,
1376 struct snd_seq_client_port *sport,
1377 struct snd_seq_client_port *dport,
1378 struct snd_seq_port_subscribe *subs)
1379 {
1380 if (client->number != subs->sender.client &&
1381 client->number != subs->dest.client) {
1382 /* connection by third client - check export permission */
1383 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1384 return -EPERM;
1385 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1386 return -EPERM;
1387 }
1388
1389 /* check read permission */
1390 /* if sender or receiver is the subscribing client itself,
1391 * no permission check is necessary
1392 */
1393 if (client->number != subs->sender.client) {
1394 if (! check_port_perm(sport, PERM_RD))
1395 return -EPERM;
1396 }
1397 /* check write permission */
1398 if (client->number != subs->dest.client) {
1399 if (! check_port_perm(dport, PERM_WR))
1400 return -EPERM;
1401 }
1402 return 0;
1403 }
1404
1405 /*
1406 * send an subscription notify event to user client:
1407 * client must be user client.
1408 */
1409 int snd_seq_client_notify_subscription(int client, int port,
1410 struct snd_seq_port_subscribe *info,
1411 int evtype)
1412 {
1413 struct snd_seq_event event;
1414
1415 memset(&event, 0, sizeof(event));
1416 event.type = evtype;
1417 event.data.connect.dest = info->dest;
1418 event.data.connect.sender = info->sender;
1419
1420 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1421 }
1422
1423
1424 /*
1425 * add to port's subscription list IOCTL interface
1426 */
1427 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1428 void __user *arg)
1429 {
1430 int result = -EINVAL;
1431 struct snd_seq_client *receiver = NULL, *sender = NULL;
1432 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1433 struct snd_seq_port_subscribe subs;
1434
1435 if (copy_from_user(&subs, arg, sizeof(subs)))
1436 return -EFAULT;
1437
1438 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1439 goto __end;
1440 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1441 goto __end;
1442 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1443 goto __end;
1444 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1445 goto __end;
1446
1447 result = check_subscription_permission(client, sport, dport, &subs);
1448 if (result < 0)
1449 goto __end;
1450
1451 /* connect them */
1452 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1453 if (! result) /* broadcast announce */
1454 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1455 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1456 __end:
1457 if (sport)
1458 snd_seq_port_unlock(sport);
1459 if (dport)
1460 snd_seq_port_unlock(dport);
1461 if (sender)
1462 snd_seq_client_unlock(sender);
1463 if (receiver)
1464 snd_seq_client_unlock(receiver);
1465 return result;
1466 }
1467
1468
1469 /*
1470 * remove from port's subscription list
1471 */
1472 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1473 void __user *arg)
1474 {
1475 int result = -ENXIO;
1476 struct snd_seq_client *receiver = NULL, *sender = NULL;
1477 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1478 struct snd_seq_port_subscribe subs;
1479
1480 if (copy_from_user(&subs, arg, sizeof(subs)))
1481 return -EFAULT;
1482
1483 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1484 goto __end;
1485 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1486 goto __end;
1487 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1488 goto __end;
1489 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1490 goto __end;
1491
1492 result = check_subscription_permission(client, sport, dport, &subs);
1493 if (result < 0)
1494 goto __end;
1495
1496 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1497 if (! result) /* broadcast announce */
1498 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1499 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1500 __end:
1501 if (sport)
1502 snd_seq_port_unlock(sport);
1503 if (dport)
1504 snd_seq_port_unlock(dport);
1505 if (sender)
1506 snd_seq_client_unlock(sender);
1507 if (receiver)
1508 snd_seq_client_unlock(receiver);
1509 return result;
1510 }
1511
1512
1513 /* CREATE_QUEUE ioctl() */
1514 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1515 void __user *arg)
1516 {
1517 struct snd_seq_queue_info info;
1518 int result;
1519 struct snd_seq_queue *q;
1520
1521 if (copy_from_user(&info, arg, sizeof(info)))
1522 return -EFAULT;
1523
1524 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1525 if (result < 0)
1526 return result;
1527
1528 q = queueptr(result);
1529 if (q == NULL)
1530 return -EINVAL;
1531
1532 info.queue = q->queue;
1533 info.locked = q->locked;
1534 info.owner = q->owner;
1535
1536 /* set queue name */
1537 if (! info.name[0])
1538 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1539 strlcpy(q->name, info.name, sizeof(q->name));
1540 queuefree(q);
1541
1542 if (copy_to_user(arg, &info, sizeof(info)))
1543 return -EFAULT;
1544
1545 return 0;
1546 }
1547
1548 /* DELETE_QUEUE ioctl() */
1549 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1550 void __user *arg)
1551 {
1552 struct snd_seq_queue_info info;
1553
1554 if (copy_from_user(&info, arg, sizeof(info)))
1555 return -EFAULT;
1556
1557 return snd_seq_queue_delete(client->number, info.queue);
1558 }
1559
1560 /* GET_QUEUE_INFO ioctl() */
1561 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1562 void __user *arg)
1563 {
1564 struct snd_seq_queue_info info;
1565 struct snd_seq_queue *q;
1566
1567 if (copy_from_user(&info, arg, sizeof(info)))
1568 return -EFAULT;
1569
1570 q = queueptr(info.queue);
1571 if (q == NULL)
1572 return -EINVAL;
1573
1574 memset(&info, 0, sizeof(info));
1575 info.queue = q->queue;
1576 info.owner = q->owner;
1577 info.locked = q->locked;
1578 strlcpy(info.name, q->name, sizeof(info.name));
1579 queuefree(q);
1580
1581 if (copy_to_user(arg, &info, sizeof(info)))
1582 return -EFAULT;
1583
1584 return 0;
1585 }
1586
1587 /* SET_QUEUE_INFO ioctl() */
1588 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1589 void __user *arg)
1590 {
1591 struct snd_seq_queue_info info;
1592 struct snd_seq_queue *q;
1593
1594 if (copy_from_user(&info, arg, sizeof(info)))
1595 return -EFAULT;
1596
1597 if (info.owner != client->number)
1598 return -EINVAL;
1599
1600 /* change owner/locked permission */
1601 if (snd_seq_queue_check_access(info.queue, client->number)) {
1602 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1603 return -EPERM;
1604 if (info.locked)
1605 snd_seq_queue_use(info.queue, client->number, 1);
1606 } else {
1607 return -EPERM;
1608 }
1609
1610 q = queueptr(info.queue);
1611 if (! q)
1612 return -EINVAL;
1613 if (q->owner != client->number) {
1614 queuefree(q);
1615 return -EPERM;
1616 }
1617 strlcpy(q->name, info.name, sizeof(q->name));
1618 queuefree(q);
1619
1620 return 0;
1621 }
1622
1623 /* GET_NAMED_QUEUE ioctl() */
1624 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1625 {
1626 struct snd_seq_queue_info info;
1627 struct snd_seq_queue *q;
1628
1629 if (copy_from_user(&info, arg, sizeof(info)))
1630 return -EFAULT;
1631
1632 q = snd_seq_queue_find_name(info.name);
1633 if (q == NULL)
1634 return -EINVAL;
1635 info.queue = q->queue;
1636 info.owner = q->owner;
1637 info.locked = q->locked;
1638 queuefree(q);
1639
1640 if (copy_to_user(arg, &info, sizeof(info)))
1641 return -EFAULT;
1642
1643 return 0;
1644 }
1645
1646 /* GET_QUEUE_STATUS ioctl() */
1647 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1648 void __user *arg)
1649 {
1650 struct snd_seq_queue_status status;
1651 struct snd_seq_queue *queue;
1652 struct snd_seq_timer *tmr;
1653
1654 if (copy_from_user(&status, arg, sizeof(status)))
1655 return -EFAULT;
1656
1657 queue = queueptr(status.queue);
1658 if (queue == NULL)
1659 return -EINVAL;
1660 memset(&status, 0, sizeof(status));
1661 status.queue = queue->queue;
1662
1663 tmr = queue->timer;
1664 status.events = queue->tickq->cells + queue->timeq->cells;
1665
1666 status.time = snd_seq_timer_get_cur_time(tmr);
1667 status.tick = snd_seq_timer_get_cur_tick(tmr);
1668
1669 status.running = tmr->running;
1670
1671 status.flags = queue->flags;
1672 queuefree(queue);
1673
1674 if (copy_to_user(arg, &status, sizeof(status)))
1675 return -EFAULT;
1676 return 0;
1677 }
1678
1679
1680 /* GET_QUEUE_TEMPO ioctl() */
1681 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1682 void __user *arg)
1683 {
1684 struct snd_seq_queue_tempo tempo;
1685 struct snd_seq_queue *queue;
1686 struct snd_seq_timer *tmr;
1687
1688 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1689 return -EFAULT;
1690
1691 queue = queueptr(tempo.queue);
1692 if (queue == NULL)
1693 return -EINVAL;
1694 memset(&tempo, 0, sizeof(tempo));
1695 tempo.queue = queue->queue;
1696
1697 tmr = queue->timer;
1698
1699 tempo.tempo = tmr->tempo;
1700 tempo.ppq = tmr->ppq;
1701 tempo.skew_value = tmr->skew;
1702 tempo.skew_base = tmr->skew_base;
1703 queuefree(queue);
1704
1705 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1706 return -EFAULT;
1707 return 0;
1708 }
1709
1710
1711 /* SET_QUEUE_TEMPO ioctl() */
1712 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1713 {
1714 if (!snd_seq_queue_check_access(tempo->queue, client))
1715 return -EPERM;
1716 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1717 }
1718
1719 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1720
1721 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1722 void __user *arg)
1723 {
1724 int result;
1725 struct snd_seq_queue_tempo tempo;
1726
1727 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1728 return -EFAULT;
1729
1730 result = snd_seq_set_queue_tempo(client->number, &tempo);
1731 return result < 0 ? result : 0;
1732 }
1733
1734
1735 /* GET_QUEUE_TIMER ioctl() */
1736 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1737 void __user *arg)
1738 {
1739 struct snd_seq_queue_timer timer;
1740 struct snd_seq_queue *queue;
1741 struct snd_seq_timer *tmr;
1742
1743 if (copy_from_user(&timer, arg, sizeof(timer)))
1744 return -EFAULT;
1745
1746 queue = queueptr(timer.queue);
1747 if (queue == NULL)
1748 return -EINVAL;
1749
1750 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1751 queuefree(queue);
1752 return -ERESTARTSYS;
1753 }
1754 tmr = queue->timer;
1755 memset(&timer, 0, sizeof(timer));
1756 timer.queue = queue->queue;
1757
1758 timer.type = tmr->type;
1759 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1760 timer.u.alsa.id = tmr->alsa_id;
1761 timer.u.alsa.resolution = tmr->preferred_resolution;
1762 }
1763 mutex_unlock(&queue->timer_mutex);
1764 queuefree(queue);
1765
1766 if (copy_to_user(arg, &timer, sizeof(timer)))
1767 return -EFAULT;
1768 return 0;
1769 }
1770
1771
1772 /* SET_QUEUE_TIMER ioctl() */
1773 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1774 void __user *arg)
1775 {
1776 int result = 0;
1777 struct snd_seq_queue_timer timer;
1778
1779 if (copy_from_user(&timer, arg, sizeof(timer)))
1780 return -EFAULT;
1781
1782 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1783 return -EINVAL;
1784
1785 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1786 struct snd_seq_queue *q;
1787 struct snd_seq_timer *tmr;
1788
1789 q = queueptr(timer.queue);
1790 if (q == NULL)
1791 return -ENXIO;
1792 if (mutex_lock_interruptible(&q->timer_mutex)) {
1793 queuefree(q);
1794 return -ERESTARTSYS;
1795 }
1796 tmr = q->timer;
1797 snd_seq_queue_timer_close(timer.queue);
1798 tmr->type = timer.type;
1799 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1800 tmr->alsa_id = timer.u.alsa.id;
1801 tmr->preferred_resolution = timer.u.alsa.resolution;
1802 }
1803 result = snd_seq_queue_timer_open(timer.queue);
1804 mutex_unlock(&q->timer_mutex);
1805 queuefree(q);
1806 } else {
1807 return -EPERM;
1808 }
1809
1810 return result;
1811 }
1812
1813
1814 /* GET_QUEUE_CLIENT ioctl() */
1815 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1816 void __user *arg)
1817 {
1818 struct snd_seq_queue_client info;
1819 int used;
1820
1821 if (copy_from_user(&info, arg, sizeof(info)))
1822 return -EFAULT;
1823
1824 used = snd_seq_queue_is_used(info.queue, client->number);
1825 if (used < 0)
1826 return -EINVAL;
1827 info.used = used;
1828 info.client = client->number;
1829
1830 if (copy_to_user(arg, &info, sizeof(info)))
1831 return -EFAULT;
1832 return 0;
1833 }
1834
1835
1836 /* SET_QUEUE_CLIENT ioctl() */
1837 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1838 void __user *arg)
1839 {
1840 int err;
1841 struct snd_seq_queue_client info;
1842
1843 if (copy_from_user(&info, arg, sizeof(info)))
1844 return -EFAULT;
1845
1846 if (info.used >= 0) {
1847 err = snd_seq_queue_use(info.queue, client->number, info.used);
1848 if (err < 0)
1849 return err;
1850 }
1851
1852 return snd_seq_ioctl_get_queue_client(client, arg);
1853 }
1854
1855
1856 /* GET_CLIENT_POOL ioctl() */
1857 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1858 void __user *arg)
1859 {
1860 struct snd_seq_client_pool info;
1861 struct snd_seq_client *cptr;
1862
1863 if (copy_from_user(&info, arg, sizeof(info)))
1864 return -EFAULT;
1865
1866 cptr = snd_seq_client_use_ptr(info.client);
1867 if (cptr == NULL)
1868 return -ENOENT;
1869 memset(&info, 0, sizeof(info));
1870 info.output_pool = cptr->pool->size;
1871 info.output_room = cptr->pool->room;
1872 info.output_free = info.output_pool;
1873 info.output_free = snd_seq_unused_cells(cptr->pool);
1874 if (cptr->type == USER_CLIENT) {
1875 info.input_pool = cptr->data.user.fifo_pool_size;
1876 info.input_free = info.input_pool;
1877 if (cptr->data.user.fifo)
1878 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1879 } else {
1880 info.input_pool = 0;
1881 info.input_free = 0;
1882 }
1883 snd_seq_client_unlock(cptr);
1884
1885 if (copy_to_user(arg, &info, sizeof(info)))
1886 return -EFAULT;
1887 return 0;
1888 }
1889
1890 /* SET_CLIENT_POOL ioctl() */
1891 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1892 void __user *arg)
1893 {
1894 struct snd_seq_client_pool info;
1895 int rc;
1896
1897 if (copy_from_user(&info, arg, sizeof(info)))
1898 return -EFAULT;
1899
1900 if (client->number != info.client)
1901 return -EINVAL; /* can't change other clients */
1902
1903 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1904 (! snd_seq_write_pool_allocated(client) ||
1905 info.output_pool != client->pool->size)) {
1906 if (snd_seq_write_pool_allocated(client)) {
1907 /* remove all existing cells */
1908 snd_seq_queue_client_leave_cells(client->number);
1909 snd_seq_pool_done(client->pool);
1910 }
1911 client->pool->size = info.output_pool;
1912 rc = snd_seq_pool_init(client->pool);
1913 if (rc < 0)
1914 return rc;
1915 }
1916 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1917 info.input_pool >= 1 &&
1918 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1919 info.input_pool != client->data.user.fifo_pool_size) {
1920 /* change pool size */
1921 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1922 if (rc < 0)
1923 return rc;
1924 client->data.user.fifo_pool_size = info.input_pool;
1925 }
1926 if (info.output_room >= 1 &&
1927 info.output_room <= client->pool->size) {
1928 client->pool->room = info.output_room;
1929 }
1930
1931 return snd_seq_ioctl_get_client_pool(client, arg);
1932 }
1933
1934
1935 /* REMOVE_EVENTS ioctl() */
1936 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1937 void __user *arg)
1938 {
1939 struct snd_seq_remove_events info;
1940
1941 if (copy_from_user(&info, arg, sizeof(info)))
1942 return -EFAULT;
1943
1944 /*
1945 * Input mostly not implemented XXX.
1946 */
1947 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1948 /*
1949 * No restrictions so for a user client we can clear
1950 * the whole fifo
1951 */
1952 if (client->type == USER_CLIENT)
1953 snd_seq_fifo_clear(client->data.user.fifo);
1954 }
1955
1956 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1957 snd_seq_queue_remove_cells(client->number, &info);
1958
1959 return 0;
1960 }
1961
1962
1963 /*
1964 * get subscription info
1965 */
1966 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1967 void __user *arg)
1968 {
1969 int result;
1970 struct snd_seq_client *sender = NULL;
1971 struct snd_seq_client_port *sport = NULL;
1972 struct snd_seq_port_subscribe subs;
1973 struct snd_seq_subscribers *p;
1974
1975 if (copy_from_user(&subs, arg, sizeof(subs)))
1976 return -EFAULT;
1977
1978 result = -EINVAL;
1979 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1980 goto __end;
1981 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1982 goto __end;
1983 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1984 if (p) {
1985 result = 0;
1986 subs = p->info;
1987 } else
1988 result = -ENOENT;
1989
1990 __end:
1991 if (sport)
1992 snd_seq_port_unlock(sport);
1993 if (sender)
1994 snd_seq_client_unlock(sender);
1995 if (result >= 0) {
1996 if (copy_to_user(arg, &subs, sizeof(subs)))
1997 return -EFAULT;
1998 }
1999 return result;
2000 }
2001
2002
2003 /*
2004 * get subscription info - check only its presence
2005 */
2006 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2007 void __user *arg)
2008 {
2009 int result = -ENXIO;
2010 struct snd_seq_client *cptr = NULL;
2011 struct snd_seq_client_port *port = NULL;
2012 struct snd_seq_query_subs subs;
2013 struct snd_seq_port_subs_info *group;
2014 struct list_head *p;
2015 int i;
2016
2017 if (copy_from_user(&subs, arg, sizeof(subs)))
2018 return -EFAULT;
2019
2020 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2021 goto __end;
2022 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2023 goto __end;
2024
2025 switch (subs.type) {
2026 case SNDRV_SEQ_QUERY_SUBS_READ:
2027 group = &port->c_src;
2028 break;
2029 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2030 group = &port->c_dest;
2031 break;
2032 default:
2033 goto __end;
2034 }
2035
2036 down_read(&group->list_mutex);
2037 /* search for the subscriber */
2038 subs.num_subs = group->count;
2039 i = 0;
2040 result = -ENOENT;
2041 list_for_each(p, &group->list_head) {
2042 if (i++ == subs.index) {
2043 /* found! */
2044 struct snd_seq_subscribers *s;
2045 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2046 s = list_entry(p, struct snd_seq_subscribers, src_list);
2047 subs.addr = s->info.dest;
2048 } else {
2049 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2050 subs.addr = s->info.sender;
2051 }
2052 subs.flags = s->info.flags;
2053 subs.queue = s->info.queue;
2054 result = 0;
2055 break;
2056 }
2057 }
2058 up_read(&group->list_mutex);
2059
2060 __end:
2061 if (port)
2062 snd_seq_port_unlock(port);
2063 if (cptr)
2064 snd_seq_client_unlock(cptr);
2065 if (result >= 0) {
2066 if (copy_to_user(arg, &subs, sizeof(subs)))
2067 return -EFAULT;
2068 }
2069 return result;
2070 }
2071
2072
2073 /*
2074 * query next client
2075 */
2076 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2077 void __user *arg)
2078 {
2079 struct snd_seq_client *cptr = NULL;
2080 struct snd_seq_client_info info;
2081
2082 if (copy_from_user(&info, arg, sizeof(info)))
2083 return -EFAULT;
2084
2085 /* search for next client */
2086 info.client++;
2087 if (info.client < 0)
2088 info.client = 0;
2089 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2090 cptr = snd_seq_client_use_ptr(info.client);
2091 if (cptr)
2092 break; /* found */
2093 }
2094 if (cptr == NULL)
2095 return -ENOENT;
2096
2097 get_client_info(cptr, &info);
2098 snd_seq_client_unlock(cptr);
2099
2100 if (copy_to_user(arg, &info, sizeof(info)))
2101 return -EFAULT;
2102 return 0;
2103 }
2104
2105 /*
2106 * query next port
2107 */
2108 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2109 void __user *arg)
2110 {
2111 struct snd_seq_client *cptr;
2112 struct snd_seq_client_port *port = NULL;
2113 struct snd_seq_port_info info;
2114
2115 if (copy_from_user(&info, arg, sizeof(info)))
2116 return -EFAULT;
2117 cptr = snd_seq_client_use_ptr(info.addr.client);
2118 if (cptr == NULL)
2119 return -ENXIO;
2120
2121 /* search for next port */
2122 info.addr.port++;
2123 port = snd_seq_port_query_nearest(cptr, &info);
2124 if (port == NULL) {
2125 snd_seq_client_unlock(cptr);
2126 return -ENOENT;
2127 }
2128
2129 /* get port info */
2130 info.addr = port->addr;
2131 snd_seq_get_port_info(port, &info);
2132 snd_seq_port_unlock(port);
2133 snd_seq_client_unlock(cptr);
2134
2135 if (copy_to_user(arg, &info, sizeof(info)))
2136 return -EFAULT;
2137 return 0;
2138 }
2139
2140 /* -------------------------------------------------------- */
2141
2142 static struct seq_ioctl_table {
2143 unsigned int cmd;
2144 int (*func)(struct snd_seq_client *client, void __user * arg);
2145 } ioctl_tables[] = {
2146 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2147 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2148 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2149 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2150 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2151 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2152 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2153 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2154 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2155 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2156 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2157 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2158 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2159 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2160 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2161 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2162 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2163 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2164 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2165 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2166 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2167 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2168 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2169 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2170 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2171 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2172 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2173 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2174 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2175 { 0, NULL },
2176 };
2177
2178 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2179 void __user *arg)
2180 {
2181 struct seq_ioctl_table *p;
2182
2183 switch (cmd) {
2184 case SNDRV_SEQ_IOCTL_PVERSION:
2185 /* return sequencer version number */
2186 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2187 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2188 /* return the id of this client */
2189 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2190 }
2191
2192 if (! arg)
2193 return -EFAULT;
2194 for (p = ioctl_tables; p->cmd; p++) {
2195 if (p->cmd == cmd)
2196 return p->func(client, arg);
2197 }
2198 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2199 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2200 return -ENOTTY;
2201 }
2202
2203
2204 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2205 {
2206 struct snd_seq_client *client = file->private_data;
2207
2208 if (snd_BUG_ON(!client))
2209 return -ENXIO;
2210
2211 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2212 }
2213
2214 #ifdef CONFIG_COMPAT
2215 #include "seq_compat.c"
2216 #else
2217 #define snd_seq_ioctl_compat NULL
2218 #endif
2219
2220 /* -------------------------------------------------------- */
2221
2222
2223 /* exported to kernel modules */
2224 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2225 const char *name_fmt, ...)
2226 {
2227 struct snd_seq_client *client;
2228 va_list args;
2229
2230 if (snd_BUG_ON(in_interrupt()))
2231 return -EBUSY;
2232
2233 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2234 return -EINVAL;
2235 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2236 return -EINVAL;
2237
2238 if (mutex_lock_interruptible(&register_mutex))
2239 return -ERESTARTSYS;
2240
2241 if (card) {
2242 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2243 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2244 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2245 client_index = -1;
2246 }
2247
2248 /* empty write queue as default */
2249 client = seq_create_client1(client_index, 0);
2250 if (client == NULL) {
2251 mutex_unlock(&register_mutex);
2252 return -EBUSY; /* failure code */
2253 }
2254 usage_alloc(&client_usage, 1);
2255
2256 client->accept_input = 1;
2257 client->accept_output = 1;
2258
2259 va_start(args, name_fmt);
2260 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2261 va_end(args);
2262
2263 client->type = KERNEL_CLIENT;
2264 mutex_unlock(&register_mutex);
2265
2266 /* make others aware this new client */
2267 snd_seq_system_client_ev_client_start(client->number);
2268
2269 /* return client number to caller */
2270 return client->number;
2271 }
2272
2273 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2274
2275 /* exported to kernel modules */
2276 int snd_seq_delete_kernel_client(int client)
2277 {
2278 struct snd_seq_client *ptr;
2279
2280 if (snd_BUG_ON(in_interrupt()))
2281 return -EBUSY;
2282
2283 ptr = clientptr(client);
2284 if (ptr == NULL)
2285 return -EINVAL;
2286
2287 seq_free_client(ptr);
2288 kfree(ptr);
2289 return 0;
2290 }
2291
2292 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2293
2294 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2295 * and snd_seq_kernel_client_enqueue_blocking
2296 */
2297 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2298 struct file *file, int blocking,
2299 int atomic, int hop)
2300 {
2301 struct snd_seq_client *cptr;
2302 int result;
2303
2304 if (snd_BUG_ON(!ev))
2305 return -EINVAL;
2306
2307 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2308 return 0; /* ignore this */
2309 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2310 return -EINVAL; /* quoted events can't be enqueued */
2311
2312 /* fill in client number */
2313 ev->source.client = client;
2314
2315 if (check_event_type_and_length(ev))
2316 return -EINVAL;
2317
2318 cptr = snd_seq_client_use_ptr(client);
2319 if (cptr == NULL)
2320 return -EINVAL;
2321
2322 if (! cptr->accept_output)
2323 result = -EPERM;
2324 else /* send it */
2325 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2326
2327 snd_seq_client_unlock(cptr);
2328 return result;
2329 }
2330
2331 /*
2332 * exported, called by kernel clients to enqueue events (w/o blocking)
2333 *
2334 * RETURN VALUE: zero if succeed, negative if error
2335 */
2336 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2337 int atomic, int hop)
2338 {
2339 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2340 }
2341
2342 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2343
2344 /*
2345 * exported, called by kernel clients to enqueue events (with blocking)
2346 *
2347 * RETURN VALUE: zero if succeed, negative if error
2348 */
2349 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2350 struct file *file,
2351 int atomic, int hop)
2352 {
2353 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2354 }
2355
2356 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2357
2358 /*
2359 * exported, called by kernel clients to dispatch events directly to other
2360 * clients, bypassing the queues. Event time-stamp will be updated.
2361 *
2362 * RETURN VALUE: negative = delivery failed,
2363 * zero, or positive: the number of delivered events
2364 */
2365 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2366 int atomic, int hop)
2367 {
2368 struct snd_seq_client *cptr;
2369 int result;
2370
2371 if (snd_BUG_ON(!ev))
2372 return -EINVAL;
2373
2374 /* fill in client number */
2375 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2376 ev->source.client = client;
2377
2378 if (check_event_type_and_length(ev))
2379 return -EINVAL;
2380
2381 cptr = snd_seq_client_use_ptr(client);
2382 if (cptr == NULL)
2383 return -EINVAL;
2384
2385 if (!cptr->accept_output)
2386 result = -EPERM;
2387 else
2388 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2389
2390 snd_seq_client_unlock(cptr);
2391 return result;
2392 }
2393
2394 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2395
2396 /*
2397 * exported, called by kernel clients to perform same functions as with
2398 * userland ioctl()
2399 */
2400 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2401 {
2402 struct snd_seq_client *client;
2403 mm_segment_t fs;
2404 int result;
2405
2406 client = clientptr(clientid);
2407 if (client == NULL)
2408 return -ENXIO;
2409 fs = snd_enter_user();
2410 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2411 snd_leave_user(fs);
2412 return result;
2413 }
2414
2415 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2416
2417 /* exported (for OSS emulator) */
2418 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2419 {
2420 struct snd_seq_client *client;
2421
2422 client = clientptr(clientid);
2423 if (client == NULL)
2424 return -ENXIO;
2425
2426 if (! snd_seq_write_pool_allocated(client))
2427 return 1;
2428 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2429 return 1;
2430 return 0;
2431 }
2432
2433 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2434
2435 /*---------------------------------------------------------------------------*/
2436
2437 #ifdef CONFIG_PROC_FS
2438 /*
2439 * /proc interface
2440 */
2441 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2442 struct snd_seq_port_subs_info *group,
2443 int is_src, char *msg)
2444 {
2445 struct list_head *p;
2446 struct snd_seq_subscribers *s;
2447 int count = 0;
2448
2449 down_read(&group->list_mutex);
2450 if (list_empty(&group->list_head)) {
2451 up_read(&group->list_mutex);
2452 return;
2453 }
2454 snd_iprintf(buffer, msg);
2455 list_for_each(p, &group->list_head) {
2456 if (is_src)
2457 s = list_entry(p, struct snd_seq_subscribers, src_list);
2458 else
2459 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2460 if (count++)
2461 snd_iprintf(buffer, ", ");
2462 snd_iprintf(buffer, "%d:%d",
2463 is_src ? s->info.dest.client : s->info.sender.client,
2464 is_src ? s->info.dest.port : s->info.sender.port);
2465 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2466 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2467 if (group->exclusive)
2468 snd_iprintf(buffer, "[ex]");
2469 }
2470 up_read(&group->list_mutex);
2471 snd_iprintf(buffer, "\n");
2472 }
2473
2474 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2475 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2476 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2477
2478 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2479
2480 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2481 struct snd_seq_client *client)
2482 {
2483 struct snd_seq_client_port *p;
2484
2485 mutex_lock(&client->ports_mutex);
2486 list_for_each_entry(p, &client->ports_list_head, list) {
2487 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2488 p->addr.port, p->name,
2489 FLAG_PERM_RD(p->capability),
2490 FLAG_PERM_WR(p->capability),
2491 FLAG_PERM_EX(p->capability),
2492 FLAG_PERM_DUPLEX(p->capability));
2493 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2494 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2495 }
2496 mutex_unlock(&client->ports_mutex);
2497 }
2498
2499
2500 /* exported to seq_info.c */
2501 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2502 struct snd_info_buffer *buffer)
2503 {
2504 int c;
2505 struct snd_seq_client *client;
2506
2507 snd_iprintf(buffer, "Client info\n");
2508 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2509 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2510 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2511 snd_iprintf(buffer, "\n");
2512
2513 /* list the client table */
2514 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2515 client = snd_seq_client_use_ptr(c);
2516 if (client == NULL)
2517 continue;
2518 if (client->type == NO_CLIENT) {
2519 snd_seq_client_unlock(client);
2520 continue;
2521 }
2522
2523 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2524 c, client->name,
2525 client->type == USER_CLIENT ? "User" : "Kernel");
2526 snd_seq_info_dump_ports(buffer, client);
2527 if (snd_seq_write_pool_allocated(client)) {
2528 snd_iprintf(buffer, " Output pool :\n");
2529 snd_seq_info_pool(buffer, client->pool, " ");
2530 }
2531 if (client->type == USER_CLIENT && client->data.user.fifo &&
2532 client->data.user.fifo->pool) {
2533 snd_iprintf(buffer, " Input pool :\n");
2534 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2535 }
2536 snd_seq_client_unlock(client);
2537 }
2538 }
2539 #endif /* CONFIG_PROC_FS */
2540
2541 /*---------------------------------------------------------------------------*/
2542
2543
2544 /*
2545 * REGISTRATION PART
2546 */
2547
2548 static const struct file_operations snd_seq_f_ops =
2549 {
2550 .owner = THIS_MODULE,
2551 .read = snd_seq_read,
2552 .write = snd_seq_write,
2553 .open = snd_seq_open,
2554 .release = snd_seq_release,
2555 .llseek = no_llseek,
2556 .poll = snd_seq_poll,
2557 .unlocked_ioctl = snd_seq_ioctl,
2558 .compat_ioctl = snd_seq_ioctl_compat,
2559 };
2560
2561 /*
2562 * register sequencer device
2563 */
2564 int __init snd_sequencer_device_init(void)
2565 {
2566 int err;
2567
2568 if (mutex_lock_interruptible(&register_mutex))
2569 return -ERESTARTSYS;
2570
2571 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2572 &snd_seq_f_ops, NULL, "seq")) < 0) {
2573 mutex_unlock(&register_mutex);
2574 return err;
2575 }
2576
2577 mutex_unlock(&register_mutex);
2578
2579 return 0;
2580 }
2581
2582
2583
2584 /*
2585 * unregister sequencer device
2586 */
2587 void __exit snd_sequencer_device_done(void)
2588 {
2589 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2590 }
CRIS linux kernel tree