2 * ALSA sequencer Client Manager
3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@suse.cz>
5 * Takashi Iwai <tiwai@suse.de>
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.
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.
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
24 #include <sound/driver.h>
25 #include <linux/init.h>
26 #include <linux/smp_lock.h>
27 #include <linux/slab.h>
28 #include <sound/core.h>
29 #include <sound/minors.h>
30 #include <linux/kmod.h>
32 #include <sound/seq_kernel.h>
33 #include "seq_clientmgr.h"
34 #include "seq_memory.h"
35 #include "seq_queue.h"
36 #include "seq_timer.h"
38 #include "seq_system.h"
39 #include <sound/seq_device.h>
41 #include <linux/compat.h>
46 * this module handles the connections of userland and kernel clients
51 * There are four ranges of client numbers (last two shared):
52 * 0..15: global clients
53 * 16..127: statically allocated client numbers for cards 0..27
54 * 128..191: dynamically allocated client numbers for cards 28..31
55 * 128..191: dynamically allocated client numbers for applications
58 /* number of kernel non-card clients */
59 #define SNDRV_SEQ_GLOBAL_CLIENTS 16
60 /* clients per cards, for static clients */
61 #define SNDRV_SEQ_CLIENTS_PER_CARD 4
62 /* dynamically allocated client numbers (both kernel drivers and user space) */
63 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
65 #define SNDRV_SEQ_LFLG_INPUT 0x0001
66 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
67 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
69 static DEFINE_SPINLOCK(clients_lock);
70 static DEFINE_MUTEX(register_mutex);
75 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
76 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
77 static struct snd_seq_usage client_usage;
82 static int bounce_error_event(struct snd_seq_client *client,
83 struct snd_seq_event *event,
84 int err, int atomic, int hop);
85 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
86 struct snd_seq_event *event,
87 int filter, int atomic, int hop);
92 static inline mm_segment_t snd_enter_user(void)
94 mm_segment_t fs = get_fs();
99 static inline void snd_leave_user(mm_segment_t fs)
106 static inline unsigned short snd_seq_file_flags(struct file *file)
108 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
110 return SNDRV_SEQ_LFLG_OUTPUT;
112 return SNDRV_SEQ_LFLG_INPUT;
114 return SNDRV_SEQ_LFLG_OPEN;
118 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
120 return snd_seq_total_cells(client->pool) > 0;
123 /* return pointer to client structure for specified id */
124 static struct snd_seq_client *clientptr(int clientid)
126 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
127 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
131 return clienttab[clientid];
134 extern int seq_client_load[];
136 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
139 struct snd_seq_client *client;
141 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
142 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
146 spin_lock_irqsave(&clients_lock, flags);
147 client = clientptr(clientid);
150 if (clienttablock[clientid]) {
151 spin_unlock_irqrestore(&clients_lock, flags);
154 spin_unlock_irqrestore(&clients_lock, flags);
156 if (!in_interrupt() && current->fs->root) {
157 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
158 static char card_requested[SNDRV_CARDS];
159 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
162 if (! client_requested[clientid] && current->fs->root) {
163 client_requested[clientid] = 1;
164 for (idx = 0; idx < 15; idx++) {
165 if (seq_client_load[idx] < 0)
167 if (seq_client_load[idx] == clientid) {
168 request_module("snd-seq-client-%i",
174 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
175 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
176 SNDRV_SEQ_CLIENTS_PER_CARD;
177 if (card < snd_ecards_limit) {
178 if (! card_requested[card]) {
179 card_requested[card] = 1;
180 snd_request_card(card);
182 snd_seq_device_load_drivers();
185 spin_lock_irqsave(&clients_lock, flags);
186 client = clientptr(clientid);
189 spin_unlock_irqrestore(&clients_lock, flags);
195 snd_use_lock_use(&client->use_lock);
196 spin_unlock_irqrestore(&clients_lock, flags);
200 static void usage_alloc(struct snd_seq_usage *res, int num)
203 if (res->cur > res->peak)
204 res->peak = res->cur;
207 static void usage_free(struct snd_seq_usage *res, int num)
212 /* initialise data structures */
213 int __init client_init_data(void)
215 /* zap out the client table */
216 memset(&clienttablock, 0, sizeof(clienttablock));
217 memset(&clienttab, 0, sizeof(clienttab));
222 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
226 struct snd_seq_client *client;
228 /* init client data */
229 client = kzalloc(sizeof(*client), GFP_KERNEL);
232 client->pool = snd_seq_pool_new(poolsize);
233 if (client->pool == NULL) {
237 client->type = NO_CLIENT;
238 snd_use_lock_init(&client->use_lock);
239 rwlock_init(&client->ports_lock);
240 mutex_init(&client->ports_mutex);
241 INIT_LIST_HEAD(&client->ports_list_head);
243 /* find free slot in the client table */
244 spin_lock_irqsave(&clients_lock, flags);
245 if (client_index < 0) {
246 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
247 c < SNDRV_SEQ_MAX_CLIENTS;
249 if (clienttab[c] || clienttablock[c])
251 clienttab[client->number = c] = client;
252 spin_unlock_irqrestore(&clients_lock, flags);
256 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
257 clienttab[client->number = client_index] = client;
258 spin_unlock_irqrestore(&clients_lock, flags);
262 spin_unlock_irqrestore(&clients_lock, flags);
263 snd_seq_pool_delete(&client->pool);
265 return NULL; /* no free slot found or busy, return failure code */
269 static int seq_free_client1(struct snd_seq_client *client)
273 snd_assert(client != NULL, return -EINVAL);
274 snd_seq_delete_all_ports(client);
275 snd_seq_queue_client_leave(client->number);
276 spin_lock_irqsave(&clients_lock, flags);
277 clienttablock[client->number] = 1;
278 clienttab[client->number] = NULL;
279 spin_unlock_irqrestore(&clients_lock, flags);
280 snd_use_lock_sync(&client->use_lock);
281 snd_seq_queue_client_termination(client->number);
283 snd_seq_pool_delete(&client->pool);
284 spin_lock_irqsave(&clients_lock, flags);
285 clienttablock[client->number] = 0;
286 spin_unlock_irqrestore(&clients_lock, flags);
291 static void seq_free_client(struct snd_seq_client * client)
293 mutex_lock(®ister_mutex);
294 switch (client->type) {
296 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
301 seq_free_client1(client);
302 usage_free(&client_usage, 1);
306 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
307 client->number, client->type);
309 mutex_unlock(®ister_mutex);
311 snd_seq_system_client_ev_client_exit(client->number);
316 /* -------------------------------------------------------- */
318 /* create a user client */
319 static int snd_seq_open(struct inode *inode, struct file *file)
321 int c, mode; /* client id */
322 struct snd_seq_client *client;
323 struct snd_seq_user_client *user;
325 if (mutex_lock_interruptible(®ister_mutex))
327 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
328 if (client == NULL) {
329 mutex_unlock(®ister_mutex);
330 return -ENOMEM; /* failure code */
333 mode = snd_seq_file_flags(file);
334 if (mode & SNDRV_SEQ_LFLG_INPUT)
335 client->accept_input = 1;
336 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
337 client->accept_output = 1;
339 user = &client->data.user;
341 user->fifo_pool_size = 0;
343 if (mode & SNDRV_SEQ_LFLG_INPUT) {
344 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
345 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
346 if (user->fifo == NULL) {
347 seq_free_client1(client);
349 mutex_unlock(®ister_mutex);
354 usage_alloc(&client_usage, 1);
355 client->type = USER_CLIENT;
356 mutex_unlock(®ister_mutex);
359 file->private_data = client;
361 /* fill client data */
363 sprintf(client->name, "Client-%d", c);
365 /* make others aware this new client */
366 snd_seq_system_client_ev_client_start(c);
371 /* delete a user client */
372 static int snd_seq_release(struct inode *inode, struct file *file)
374 struct snd_seq_client *client = file->private_data;
377 seq_free_client(client);
378 if (client->data.user.fifo)
379 snd_seq_fifo_delete(&client->data.user.fifo);
387 /* handle client read() */
388 /* possible error values:
389 * -ENXIO invalid client or file open mode
390 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
391 * -EINVAL no enough user-space buffer to write the whole event
392 * -EFAULT seg. fault during copy to user space
394 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
397 struct snd_seq_client *client = file->private_data;
398 struct snd_seq_fifo *fifo;
401 struct snd_seq_event_cell *cell;
403 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
406 if (!access_ok(VERIFY_WRITE, buf, count))
409 /* check client structures are in place */
410 snd_assert(client != NULL, return -ENXIO);
412 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
415 if (atomic_read(&fifo->overflow) > 0) {
416 /* buffer overflow is detected */
417 snd_seq_fifo_clear(fifo);
418 /* return error code */
424 snd_seq_fifo_lock(fifo);
426 /* while data available in queue */
427 while (count >= sizeof(struct snd_seq_event)) {
430 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
431 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
434 if (snd_seq_ev_is_variable(&cell->event)) {
435 struct snd_seq_event tmpev;
437 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
438 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
442 count -= sizeof(struct snd_seq_event);
443 buf += sizeof(struct snd_seq_event);
444 err = snd_seq_expand_var_event(&cell->event, count,
445 (char __force *)buf, 0,
446 sizeof(struct snd_seq_event));
453 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
457 count -= sizeof(struct snd_seq_event);
458 buf += sizeof(struct snd_seq_event);
460 snd_seq_cell_free(cell);
461 cell = NULL; /* to be sure */
462 result += sizeof(struct snd_seq_event);
467 snd_seq_fifo_cell_putback(fifo, cell);
468 if (err == -EAGAIN && result > 0)
471 snd_seq_fifo_unlock(fifo);
473 return (err < 0) ? err : result;
478 * check access permission to the port
480 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
482 if ((port->capability & flags) != flags)
488 * check if the destination client is available, and return the pointer
489 * if filter is non-zero, client filter bitmap is tested.
491 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
494 struct snd_seq_client *dest;
496 dest = snd_seq_client_use_ptr(event->dest.client);
499 if (! dest->accept_input)
501 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
502 ! test_bit(event->type, dest->event_filter))
504 if (filter && !(dest->filter & filter))
507 return dest; /* ok - accessible */
509 snd_seq_client_unlock(dest);
515 * Return the error event.
517 * If the receiver client is a user client, the original event is
518 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
519 * the original event is also variable length, the external data is
520 * copied after the event record.
521 * If the receiver client is a kernel client, the original event is
522 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
525 static int bounce_error_event(struct snd_seq_client *client,
526 struct snd_seq_event *event,
527 int err, int atomic, int hop)
529 struct snd_seq_event bounce_ev;
532 if (client == NULL ||
533 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
534 ! client->accept_input)
535 return 0; /* ignored */
537 /* set up quoted error */
538 memset(&bounce_ev, 0, sizeof(bounce_ev));
539 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
540 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
541 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
542 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
543 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
544 bounce_ev.dest.client = client->number;
545 bounce_ev.dest.port = event->source.port;
546 bounce_ev.data.quote.origin = event->dest;
547 bounce_ev.data.quote.event = event;
548 bounce_ev.data.quote.value = -err; /* use positive value */
549 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
551 client->event_lost++;
560 * rewrite the time-stamp of the event record with the curren time
561 * of the given queue.
562 * return non-zero if updated.
564 static int update_timestamp_of_queue(struct snd_seq_event *event,
565 int queue, int real_time)
567 struct snd_seq_queue *q;
572 event->queue = queue;
573 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
575 event->time.time = snd_seq_timer_get_cur_time(q->timer);
576 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
578 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
579 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
587 * deliver an event to the specified destination.
588 * if filter is non-zero, client filter bitmap is tested.
590 * RETURN VALUE: 0 : if succeeded
593 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
594 struct snd_seq_event *event,
595 int filter, int atomic, int hop)
597 struct snd_seq_client *dest = NULL;
598 struct snd_seq_client_port *dest_port = NULL;
599 int result = -ENOENT;
602 direct = snd_seq_ev_is_direct(event);
604 dest = get_event_dest_client(event, filter);
607 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
608 if (dest_port == NULL)
611 /* check permission */
612 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
617 if (dest_port->timestamping)
618 update_timestamp_of_queue(event, dest_port->time_queue,
619 dest_port->time_real);
621 switch (dest->type) {
623 if (dest->data.user.fifo)
624 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
628 if (dest_port->event_input == NULL)
630 result = dest_port->event_input(event, direct,
631 dest_port->private_data,
640 snd_seq_port_unlock(dest_port);
642 snd_seq_client_unlock(dest);
644 if (result < 0 && !direct) {
645 result = bounce_error_event(client, event, result, atomic, hop);
652 * send the event to all subscribers:
654 static int deliver_to_subscribers(struct snd_seq_client *client,
655 struct snd_seq_event *event,
658 struct snd_seq_subscribers *subs;
659 int err = 0, num_ev = 0;
660 struct snd_seq_event event_saved;
661 struct snd_seq_client_port *src_port;
662 struct snd_seq_port_subs_info *grp;
664 src_port = snd_seq_port_use_ptr(client, event->source.port);
665 if (src_port == NULL)
666 return -EINVAL; /* invalid source port */
667 /* save original event record */
668 event_saved = *event;
669 grp = &src_port->c_src;
673 read_lock(&grp->list_lock);
675 down_read(&grp->list_mutex);
676 list_for_each_entry(subs, &grp->list_head, src_list) {
677 event->dest = subs->info.dest;
678 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
679 /* convert time according to flag with subscription */
680 update_timestamp_of_queue(event, subs->info.queue,
681 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
682 err = snd_seq_deliver_single_event(client, event,
687 /* restore original event record */
688 *event = event_saved;
691 read_unlock(&grp->list_lock);
693 up_read(&grp->list_mutex);
694 *event = event_saved; /* restore */
695 snd_seq_port_unlock(src_port);
696 return (err < 0) ? err : num_ev;
700 #ifdef SUPPORT_BROADCAST
702 * broadcast to all ports:
704 static int port_broadcast_event(struct snd_seq_client *client,
705 struct snd_seq_event *event,
708 int num_ev = 0, err = 0;
709 struct snd_seq_client *dest_client;
710 struct snd_seq_client_port *port;
712 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
713 if (dest_client == NULL)
714 return 0; /* no matching destination */
716 read_lock(&dest_client->ports_lock);
717 list_for_each_entry(port, &dest_client->ports_list_head, list) {
718 event->dest.port = port->addr.port;
719 /* pass NULL as source client to avoid error bounce */
720 err = snd_seq_deliver_single_event(NULL, event,
721 SNDRV_SEQ_FILTER_BROADCAST,
727 read_unlock(&dest_client->ports_lock);
728 snd_seq_client_unlock(dest_client);
729 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
730 return (err < 0) ? err : num_ev;
734 * send the event to all clients:
735 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
737 static int broadcast_event(struct snd_seq_client *client,
738 struct snd_seq_event *event, int atomic, int hop)
740 int err = 0, num_ev = 0;
742 struct snd_seq_addr addr;
744 addr = event->dest; /* save */
746 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
747 /* don't send to itself */
748 if (dest == client->number)
750 event->dest.client = dest;
751 event->dest.port = addr.port;
752 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
753 err = port_broadcast_event(client, event, atomic, hop);
755 /* pass NULL as source client to avoid error bounce */
756 err = snd_seq_deliver_single_event(NULL, event,
757 SNDRV_SEQ_FILTER_BROADCAST,
763 event->dest = addr; /* restore */
764 return (err < 0) ? err : num_ev;
768 /* multicast - not supported yet */
769 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
772 snd_printd("seq: multicast not supported yet.\n");
773 return 0; /* ignored */
775 #endif /* SUPPORT_BROADCAST */
778 /* deliver an event to the destination port(s).
779 * if the event is to subscribers or broadcast, the event is dispatched
780 * to multiple targets.
782 * RETURN VALUE: n > 0 : the number of delivered events.
783 * n == 0 : the event was not passed to any client.
784 * n < 0 : error - event was not processed.
786 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
792 if (hop >= SNDRV_SEQ_MAX_HOPS) {
793 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
794 event->source.client, event->source.port,
795 event->dest.client, event->dest.port);
799 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
800 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
801 result = deliver_to_subscribers(client, event, atomic, hop);
802 #ifdef SUPPORT_BROADCAST
803 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
804 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
805 result = broadcast_event(client, event, atomic, hop);
806 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
807 result = multicast_event(client, event, atomic, hop);
808 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
809 result = port_broadcast_event(client, event, atomic, hop);
812 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
818 * dispatch an event cell:
819 * This function is called only from queue check routines in timer
820 * interrupts or after enqueued.
821 * The event cell shall be released or re-queued in this function.
823 * RETURN VALUE: n > 0 : the number of delivered events.
824 * n == 0 : the event was not passed to any client.
825 * n < 0 : error - event was not processed.
827 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
829 struct snd_seq_client *client;
832 snd_assert(cell != NULL, return -EINVAL);
834 client = snd_seq_client_use_ptr(cell->event.source.client);
835 if (client == NULL) {
836 snd_seq_cell_free(cell); /* release this cell */
840 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
842 * the event cell is re-used as a NOTE-OFF event and
845 struct snd_seq_event tmpev, *ev;
847 /* reserve this event to enqueue note-off later */
849 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
850 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
853 * This was originally a note event. We now re-use the
854 * cell for the note-off event.
858 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
859 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
861 /* add the duration time */
862 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
863 case SNDRV_SEQ_TIME_STAMP_TICK:
864 ev->time.tick += ev->data.note.duration;
866 case SNDRV_SEQ_TIME_STAMP_REAL:
867 /* unit for duration is ms */
868 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
869 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
870 ev->time.time.tv_nsec / 1000000000;
871 ev->time.time.tv_nsec %= 1000000000;
874 ev->data.note.velocity = ev->data.note.off_velocity;
876 /* Now queue this cell as the note off event */
877 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
878 snd_seq_cell_free(cell); /* release this cell */
882 * event cell is freed after processing the event
885 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
886 snd_seq_cell_free(cell);
889 snd_seq_client_unlock(client);
894 /* Allocate a cell from client pool and enqueue it to queue:
895 * if pool is empty and blocking is TRUE, sleep until a new cell is
898 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
899 struct snd_seq_event *event,
900 struct file *file, int blocking,
903 struct snd_seq_event_cell *cell;
906 /* special queue values - force direct passing */
907 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
908 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
909 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
911 #ifdef SUPPORT_BROADCAST
912 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
913 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
914 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
917 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
918 /* check presence of source port */
919 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
920 if (src_port == NULL)
922 snd_seq_port_unlock(src_port);
925 /* direct event processing without enqueued */
926 if (snd_seq_ev_is_direct(event)) {
927 if (event->type == SNDRV_SEQ_EVENT_NOTE)
928 return -EINVAL; /* this event must be enqueued! */
929 return snd_seq_deliver_event(client, event, atomic, hop);
932 /* Not direct, normal queuing */
933 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
934 return -EINVAL; /* invalid queue */
935 if (! snd_seq_write_pool_allocated(client))
936 return -ENXIO; /* queue is not allocated */
938 /* allocate an event cell */
939 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
943 /* we got a cell. enqueue it. */
944 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
945 snd_seq_cell_free(cell);
954 * check validity of event type and data length.
955 * return non-zero if invalid.
957 static int check_event_type_and_length(struct snd_seq_event *ev)
959 switch (snd_seq_ev_length_type(ev)) {
960 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
961 if (snd_seq_ev_is_variable_type(ev))
964 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
965 if (! snd_seq_ev_is_variable_type(ev) ||
966 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
969 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
970 if (! snd_seq_ev_is_instr_type(ev) ||
971 ! snd_seq_ev_is_direct(ev))
980 /* possible error values:
981 * -ENXIO invalid client or file open mode
982 * -ENOMEM malloc failed
983 * -EFAULT seg. fault during copy from user space
984 * -EINVAL invalid event
985 * -EAGAIN no space in output pool
986 * -EINTR interrupts while sleep
987 * -EMLINK too many hops
988 * others depends on return value from driver callback
990 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
991 size_t count, loff_t *offset)
993 struct snd_seq_client *client = file->private_data;
994 int written = 0, len;
996 struct snd_seq_event event;
998 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1001 /* check client structures are in place */
1002 snd_assert(client != NULL, return -ENXIO);
1004 if (!client->accept_output || client->pool == NULL)
1007 /* allocate the pool now if the pool is not allocated yet */
1008 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1009 if (snd_seq_pool_init(client->pool) < 0)
1013 /* only process whole events */
1014 while (count >= sizeof(struct snd_seq_event)) {
1015 /* Read in the event header from the user */
1016 len = sizeof(event);
1017 if (copy_from_user(&event, buf, len)) {
1021 event.source.client = client->number; /* fill in client number */
1022 /* Check for extension data length */
1023 if (check_event_type_and_length(&event)) {
1028 /* check for special events */
1029 if (event.type == SNDRV_SEQ_EVENT_NONE)
1031 else if (snd_seq_ev_is_reserved(&event)) {
1036 if (snd_seq_ev_is_variable(&event)) {
1037 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1038 if ((size_t)(extlen + len) > count) {
1039 /* back out, will get an error this time or next */
1043 /* set user space pointer */
1044 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1045 event.data.ext.ptr = (char __force *)buf
1046 + sizeof(struct snd_seq_event);
1047 len += extlen; /* increment data length */
1049 #ifdef CONFIG_COMPAT
1050 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1051 void *ptr = compat_ptr(event.data.raw32.d[1]);
1052 event.data.ext.ptr = ptr;
1057 /* ok, enqueue it */
1058 err = snd_seq_client_enqueue_event(client, &event, file,
1059 !(file->f_flags & O_NONBLOCK),
1065 /* Update pointers and counts */
1071 return written ? written : err;
1078 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1080 struct snd_seq_client *client = file->private_data;
1081 unsigned int mask = 0;
1083 /* check client structures are in place */
1084 snd_assert(client != NULL, return -ENXIO);
1086 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1087 client->data.user.fifo) {
1089 /* check if data is available in the outqueue */
1090 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1091 mask |= POLLIN | POLLRDNORM;
1094 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1096 /* check if data is available in the pool */
1097 if (!snd_seq_write_pool_allocated(client) ||
1098 snd_seq_pool_poll_wait(client->pool, file, wait))
1099 mask |= POLLOUT | POLLWRNORM;
1106 /*-----------------------------------------------------*/
1109 /* SYSTEM_INFO ioctl() */
1110 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1112 struct snd_seq_system_info info;
1114 memset(&info, 0, sizeof(info));
1115 /* fill the info fields */
1116 info.queues = SNDRV_SEQ_MAX_QUEUES;
1117 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1118 info.ports = 256; /* fixed limit */
1119 info.channels = 256; /* fixed limit */
1120 info.cur_clients = client_usage.cur;
1121 info.cur_queues = snd_seq_queue_get_cur_queues();
1123 if (copy_to_user(arg, &info, sizeof(info)))
1129 /* RUNNING_MODE ioctl() */
1130 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1132 struct snd_seq_running_info info;
1133 struct snd_seq_client *cptr;
1136 if (copy_from_user(&info, arg, sizeof(info)))
1139 /* requested client number */
1140 cptr = snd_seq_client_use_ptr(info.client);
1142 return -ENOENT; /* don't change !!! */
1144 #ifdef SNDRV_BIG_ENDIAN
1145 if (! info.big_endian) {
1150 if (info.big_endian) {
1156 if (info.cpu_mode > sizeof(long)) {
1160 cptr->convert32 = (info.cpu_mode < sizeof(long));
1162 snd_seq_client_unlock(cptr);
1166 /* CLIENT_INFO ioctl() */
1167 static void get_client_info(struct snd_seq_client *cptr,
1168 struct snd_seq_client_info *info)
1170 info->client = cptr->number;
1172 /* fill the info fields */
1173 info->type = cptr->type;
1174 strcpy(info->name, cptr->name);
1175 info->filter = cptr->filter;
1176 info->event_lost = cptr->event_lost;
1177 memcpy(info->event_filter, cptr->event_filter, 32);
1178 info->num_ports = cptr->num_ports;
1179 memset(info->reserved, 0, sizeof(info->reserved));
1182 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1185 struct snd_seq_client *cptr;
1186 struct snd_seq_client_info client_info;
1188 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1191 /* requested client number */
1192 cptr = snd_seq_client_use_ptr(client_info.client);
1194 return -ENOENT; /* don't change !!! */
1196 get_client_info(cptr, &client_info);
1197 snd_seq_client_unlock(cptr);
1199 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1205 /* CLIENT_INFO ioctl() */
1206 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1209 struct snd_seq_client_info client_info;
1211 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1214 /* it is not allowed to set the info fields for an another client */
1215 if (client->number != client_info.client)
1217 /* also client type must be set now */
1218 if (client->type != client_info.type)
1221 /* fill the info fields */
1222 if (client_info.name[0])
1223 strlcpy(client->name, client_info.name, sizeof(client->name));
1225 client->filter = client_info.filter;
1226 client->event_lost = client_info.event_lost;
1227 memcpy(client->event_filter, client_info.event_filter, 32);
1234 * CREATE PORT ioctl()
1236 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1239 struct snd_seq_client_port *port;
1240 struct snd_seq_port_info info;
1241 struct snd_seq_port_callback *callback;
1243 if (copy_from_user(&info, arg, sizeof(info)))
1246 /* it is not allowed to create the port for an another client */
1247 if (info.addr.client != client->number)
1250 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1254 if (client->type == USER_CLIENT && info.kernel) {
1255 snd_seq_delete_port(client, port->addr.port);
1258 if (client->type == KERNEL_CLIENT) {
1259 if ((callback = info.kernel) != NULL) {
1260 if (callback->owner)
1261 port->owner = callback->owner;
1262 port->private_data = callback->private_data;
1263 port->private_free = callback->private_free;
1264 port->callback_all = callback->callback_all;
1265 port->event_input = callback->event_input;
1266 port->c_src.open = callback->subscribe;
1267 port->c_src.close = callback->unsubscribe;
1268 port->c_dest.open = callback->use;
1269 port->c_dest.close = callback->unuse;
1273 info.addr = port->addr;
1275 snd_seq_set_port_info(port, &info);
1276 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1278 if (copy_to_user(arg, &info, sizeof(info)))
1285 * DELETE PORT ioctl()
1287 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1290 struct snd_seq_port_info info;
1293 /* set passed parameters */
1294 if (copy_from_user(&info, arg, sizeof(info)))
1297 /* it is not allowed to remove the port for an another client */
1298 if (info.addr.client != client->number)
1301 err = snd_seq_delete_port(client, info.addr.port);
1303 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1309 * GET_PORT_INFO ioctl() (on any client)
1311 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1314 struct snd_seq_client *cptr;
1315 struct snd_seq_client_port *port;
1316 struct snd_seq_port_info info;
1318 if (copy_from_user(&info, arg, sizeof(info)))
1320 cptr = snd_seq_client_use_ptr(info.addr.client);
1324 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1326 snd_seq_client_unlock(cptr);
1327 return -ENOENT; /* don't change */
1331 snd_seq_get_port_info(port, &info);
1332 snd_seq_port_unlock(port);
1333 snd_seq_client_unlock(cptr);
1335 if (copy_to_user(arg, &info, sizeof(info)))
1342 * SET_PORT_INFO ioctl() (only ports on this/own client)
1344 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1347 struct snd_seq_client_port *port;
1348 struct snd_seq_port_info info;
1350 if (copy_from_user(&info, arg, sizeof(info)))
1353 if (info.addr.client != client->number) /* only set our own ports ! */
1355 port = snd_seq_port_use_ptr(client, info.addr.port);
1357 snd_seq_set_port_info(port, &info);
1358 snd_seq_port_unlock(port);
1365 * port subscription (connection)
1367 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1368 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1370 static int check_subscription_permission(struct snd_seq_client *client,
1371 struct snd_seq_client_port *sport,
1372 struct snd_seq_client_port *dport,
1373 struct snd_seq_port_subscribe *subs)
1375 if (client->number != subs->sender.client &&
1376 client->number != subs->dest.client) {
1377 /* connection by third client - check export permission */
1378 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1380 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1384 /* check read permission */
1385 /* if sender or receiver is the subscribing client itself,
1386 * no permission check is necessary
1388 if (client->number != subs->sender.client) {
1389 if (! check_port_perm(sport, PERM_RD))
1392 /* check write permission */
1393 if (client->number != subs->dest.client) {
1394 if (! check_port_perm(dport, PERM_WR))
1401 * send an subscription notify event to user client:
1402 * client must be user client.
1404 int snd_seq_client_notify_subscription(int client, int port,
1405 struct snd_seq_port_subscribe *info,
1408 struct snd_seq_event event;
1410 memset(&event, 0, sizeof(event));
1411 event.type = evtype;
1412 event.data.connect.dest = info->dest;
1413 event.data.connect.sender = info->sender;
1415 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1420 * add to port's subscription list IOCTL interface
1422 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1425 int result = -EINVAL;
1426 struct snd_seq_client *receiver = NULL, *sender = NULL;
1427 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1428 struct snd_seq_port_subscribe subs;
1430 if (copy_from_user(&subs, arg, sizeof(subs)))
1433 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1435 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1437 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1439 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1442 result = check_subscription_permission(client, sport, dport, &subs);
1447 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1448 if (! result) /* broadcast announce */
1449 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1450 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1453 snd_seq_port_unlock(sport);
1455 snd_seq_port_unlock(dport);
1457 snd_seq_client_unlock(sender);
1459 snd_seq_client_unlock(receiver);
1465 * remove from port's subscription list
1467 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1470 int result = -ENXIO;
1471 struct snd_seq_client *receiver = NULL, *sender = NULL;
1472 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1473 struct snd_seq_port_subscribe subs;
1475 if (copy_from_user(&subs, arg, sizeof(subs)))
1478 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1480 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1482 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1484 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1487 result = check_subscription_permission(client, sport, dport, &subs);
1491 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1492 if (! result) /* broadcast announce */
1493 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1494 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1497 snd_seq_port_unlock(sport);
1499 snd_seq_port_unlock(dport);
1501 snd_seq_client_unlock(sender);
1503 snd_seq_client_unlock(receiver);
1508 /* CREATE_QUEUE ioctl() */
1509 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1512 struct snd_seq_queue_info info;
1514 struct snd_seq_queue *q;
1516 if (copy_from_user(&info, arg, sizeof(info)))
1519 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1523 q = queueptr(result);
1527 info.queue = q->queue;
1528 info.locked = q->locked;
1529 info.owner = q->owner;
1531 /* set queue name */
1533 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1534 strlcpy(q->name, info.name, sizeof(q->name));
1537 if (copy_to_user(arg, &info, sizeof(info)))
1543 /* DELETE_QUEUE ioctl() */
1544 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1547 struct snd_seq_queue_info info;
1549 if (copy_from_user(&info, arg, sizeof(info)))
1552 return snd_seq_queue_delete(client->number, info.queue);
1555 /* GET_QUEUE_INFO ioctl() */
1556 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1559 struct snd_seq_queue_info info;
1560 struct snd_seq_queue *q;
1562 if (copy_from_user(&info, arg, sizeof(info)))
1565 q = queueptr(info.queue);
1569 memset(&info, 0, sizeof(info));
1570 info.queue = q->queue;
1571 info.owner = q->owner;
1572 info.locked = q->locked;
1573 strlcpy(info.name, q->name, sizeof(info.name));
1576 if (copy_to_user(arg, &info, sizeof(info)))
1582 /* SET_QUEUE_INFO ioctl() */
1583 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1586 struct snd_seq_queue_info info;
1587 struct snd_seq_queue *q;
1589 if (copy_from_user(&info, arg, sizeof(info)))
1592 if (info.owner != client->number)
1595 /* change owner/locked permission */
1596 if (snd_seq_queue_check_access(info.queue, client->number)) {
1597 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1600 snd_seq_queue_use(info.queue, client->number, 1);
1605 q = queueptr(info.queue);
1608 if (q->owner != client->number) {
1612 strlcpy(q->name, info.name, sizeof(q->name));
1618 /* GET_NAMED_QUEUE ioctl() */
1619 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1621 struct snd_seq_queue_info info;
1622 struct snd_seq_queue *q;
1624 if (copy_from_user(&info, arg, sizeof(info)))
1627 q = snd_seq_queue_find_name(info.name);
1630 info.queue = q->queue;
1631 info.owner = q->owner;
1632 info.locked = q->locked;
1635 if (copy_to_user(arg, &info, sizeof(info)))
1641 /* GET_QUEUE_STATUS ioctl() */
1642 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1645 struct snd_seq_queue_status status;
1646 struct snd_seq_queue *queue;
1647 struct snd_seq_timer *tmr;
1649 if (copy_from_user(&status, arg, sizeof(status)))
1652 queue = queueptr(status.queue);
1655 memset(&status, 0, sizeof(status));
1656 status.queue = queue->queue;
1659 status.events = queue->tickq->cells + queue->timeq->cells;
1661 status.time = snd_seq_timer_get_cur_time(tmr);
1662 status.tick = snd_seq_timer_get_cur_tick(tmr);
1664 status.running = tmr->running;
1666 status.flags = queue->flags;
1669 if (copy_to_user(arg, &status, sizeof(status)))
1675 /* GET_QUEUE_TEMPO ioctl() */
1676 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1679 struct snd_seq_queue_tempo tempo;
1680 struct snd_seq_queue *queue;
1681 struct snd_seq_timer *tmr;
1683 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1686 queue = queueptr(tempo.queue);
1689 memset(&tempo, 0, sizeof(tempo));
1690 tempo.queue = queue->queue;
1694 tempo.tempo = tmr->tempo;
1695 tempo.ppq = tmr->ppq;
1696 tempo.skew_value = tmr->skew;
1697 tempo.skew_base = tmr->skew_base;
1700 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1706 /* SET_QUEUE_TEMPO ioctl() */
1707 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1709 if (!snd_seq_queue_check_access(tempo->queue, client))
1711 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1714 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1716 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1720 struct snd_seq_queue_tempo tempo;
1722 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1725 result = snd_seq_set_queue_tempo(client->number, &tempo);
1726 return result < 0 ? result : 0;
1730 /* GET_QUEUE_TIMER ioctl() */
1731 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1734 struct snd_seq_queue_timer timer;
1735 struct snd_seq_queue *queue;
1736 struct snd_seq_timer *tmr;
1738 if (copy_from_user(&timer, arg, sizeof(timer)))
1741 queue = queueptr(timer.queue);
1745 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1747 return -ERESTARTSYS;
1750 memset(&timer, 0, sizeof(timer));
1751 timer.queue = queue->queue;
1753 timer.type = tmr->type;
1754 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1755 timer.u.alsa.id = tmr->alsa_id;
1756 timer.u.alsa.resolution = tmr->preferred_resolution;
1758 mutex_unlock(&queue->timer_mutex);
1761 if (copy_to_user(arg, &timer, sizeof(timer)))
1767 /* SET_QUEUE_TIMER ioctl() */
1768 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1772 struct snd_seq_queue_timer timer;
1774 if (copy_from_user(&timer, arg, sizeof(timer)))
1777 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1780 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1781 struct snd_seq_queue *q;
1782 struct snd_seq_timer *tmr;
1784 q = queueptr(timer.queue);
1787 if (mutex_lock_interruptible(&q->timer_mutex)) {
1789 return -ERESTARTSYS;
1792 snd_seq_queue_timer_close(timer.queue);
1793 tmr->type = timer.type;
1794 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1795 tmr->alsa_id = timer.u.alsa.id;
1796 tmr->preferred_resolution = timer.u.alsa.resolution;
1798 result = snd_seq_queue_timer_open(timer.queue);
1799 mutex_unlock(&q->timer_mutex);
1809 /* GET_QUEUE_CLIENT ioctl() */
1810 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1813 struct snd_seq_queue_client info;
1816 if (copy_from_user(&info, arg, sizeof(info)))
1819 used = snd_seq_queue_is_used(info.queue, client->number);
1823 info.client = client->number;
1825 if (copy_to_user(arg, &info, sizeof(info)))
1831 /* SET_QUEUE_CLIENT ioctl() */
1832 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1836 struct snd_seq_queue_client info;
1838 if (copy_from_user(&info, arg, sizeof(info)))
1841 if (info.used >= 0) {
1842 err = snd_seq_queue_use(info.queue, client->number, info.used);
1847 return snd_seq_ioctl_get_queue_client(client, arg);
1851 /* GET_CLIENT_POOL ioctl() */
1852 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1855 struct snd_seq_client_pool info;
1856 struct snd_seq_client *cptr;
1858 if (copy_from_user(&info, arg, sizeof(info)))
1861 cptr = snd_seq_client_use_ptr(info.client);
1864 memset(&info, 0, sizeof(info));
1865 info.output_pool = cptr->pool->size;
1866 info.output_room = cptr->pool->room;
1867 info.output_free = info.output_pool;
1868 info.output_free = snd_seq_unused_cells(cptr->pool);
1869 if (cptr->type == USER_CLIENT) {
1870 info.input_pool = cptr->data.user.fifo_pool_size;
1871 info.input_free = info.input_pool;
1872 if (cptr->data.user.fifo)
1873 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1875 info.input_pool = 0;
1876 info.input_free = 0;
1878 snd_seq_client_unlock(cptr);
1880 if (copy_to_user(arg, &info, sizeof(info)))
1885 /* SET_CLIENT_POOL ioctl() */
1886 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1889 struct snd_seq_client_pool info;
1892 if (copy_from_user(&info, arg, sizeof(info)))
1895 if (client->number != info.client)
1896 return -EINVAL; /* can't change other clients */
1898 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1899 (! snd_seq_write_pool_allocated(client) ||
1900 info.output_pool != client->pool->size)) {
1901 if (snd_seq_write_pool_allocated(client)) {
1902 /* remove all existing cells */
1903 snd_seq_queue_client_leave_cells(client->number);
1904 snd_seq_pool_done(client->pool);
1906 client->pool->size = info.output_pool;
1907 rc = snd_seq_pool_init(client->pool);
1911 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1912 info.input_pool >= 1 &&
1913 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1914 info.input_pool != client->data.user.fifo_pool_size) {
1915 /* change pool size */
1916 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1919 client->data.user.fifo_pool_size = info.input_pool;
1921 if (info.output_room >= 1 &&
1922 info.output_room <= client->pool->size) {
1923 client->pool->room = info.output_room;
1926 return snd_seq_ioctl_get_client_pool(client, arg);
1930 /* REMOVE_EVENTS ioctl() */
1931 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1934 struct snd_seq_remove_events info;
1936 if (copy_from_user(&info, arg, sizeof(info)))
1940 * Input mostly not implemented XXX.
1942 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1944 * No restrictions so for a user client we can clear
1947 if (client->type == USER_CLIENT)
1948 snd_seq_fifo_clear(client->data.user.fifo);
1951 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1952 snd_seq_queue_remove_cells(client->number, &info);
1959 * get subscription info
1961 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1965 struct snd_seq_client *sender = NULL;
1966 struct snd_seq_client_port *sport = NULL;
1967 struct snd_seq_port_subscribe subs;
1968 struct snd_seq_subscribers *p;
1970 if (copy_from_user(&subs, arg, sizeof(subs)))
1974 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1976 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1978 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1987 snd_seq_port_unlock(sport);
1989 snd_seq_client_unlock(sender);
1991 if (copy_to_user(arg, &subs, sizeof(subs)))
1999 * get subscription info - check only its presence
2001 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2004 int result = -ENXIO;
2005 struct snd_seq_client *cptr = NULL;
2006 struct snd_seq_client_port *port = NULL;
2007 struct snd_seq_query_subs subs;
2008 struct snd_seq_port_subs_info *group;
2009 struct list_head *p;
2012 if (copy_from_user(&subs, arg, sizeof(subs)))
2015 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2017 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2020 switch (subs.type) {
2021 case SNDRV_SEQ_QUERY_SUBS_READ:
2022 group = &port->c_src;
2024 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2025 group = &port->c_dest;
2031 down_read(&group->list_mutex);
2032 /* search for the subscriber */
2033 subs.num_subs = group->count;
2036 list_for_each(p, &group->list_head) {
2037 if (i++ == subs.index) {
2039 struct snd_seq_subscribers *s;
2040 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2041 s = list_entry(p, struct snd_seq_subscribers, src_list);
2042 subs.addr = s->info.dest;
2044 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2045 subs.addr = s->info.sender;
2047 subs.flags = s->info.flags;
2048 subs.queue = s->info.queue;
2053 up_read(&group->list_mutex);
2057 snd_seq_port_unlock(port);
2059 snd_seq_client_unlock(cptr);
2061 if (copy_to_user(arg, &subs, sizeof(subs)))
2071 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2074 struct snd_seq_client *cptr = NULL;
2075 struct snd_seq_client_info info;
2077 if (copy_from_user(&info, arg, sizeof(info)))
2080 /* search for next client */
2082 if (info.client < 0)
2084 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2085 cptr = snd_seq_client_use_ptr(info.client);
2092 get_client_info(cptr, &info);
2093 snd_seq_client_unlock(cptr);
2095 if (copy_to_user(arg, &info, sizeof(info)))
2103 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2106 struct snd_seq_client *cptr;
2107 struct snd_seq_client_port *port = NULL;
2108 struct snd_seq_port_info info;
2110 if (copy_from_user(&info, arg, sizeof(info)))
2112 cptr = snd_seq_client_use_ptr(info.addr.client);
2116 /* search for next port */
2118 port = snd_seq_port_query_nearest(cptr, &info);
2120 snd_seq_client_unlock(cptr);
2125 info.addr = port->addr;
2126 snd_seq_get_port_info(port, &info);
2127 snd_seq_port_unlock(port);
2128 snd_seq_client_unlock(cptr);
2130 if (copy_to_user(arg, &info, sizeof(info)))
2135 /* -------------------------------------------------------- */
2137 static struct seq_ioctl_table {
2139 int (*func)(struct snd_seq_client *client, void __user * arg);
2140 } ioctl_tables[] = {
2141 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2142 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2143 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2144 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2145 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2146 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2147 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2148 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2149 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2150 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2151 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2152 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2153 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2154 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2155 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2156 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2157 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2158 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2159 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2160 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2161 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2162 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2163 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2164 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2165 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2166 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2167 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2168 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2169 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2173 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2176 struct seq_ioctl_table *p;
2179 case SNDRV_SEQ_IOCTL_PVERSION:
2180 /* return sequencer version number */
2181 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2182 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2183 /* return the id of this client */
2184 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2189 for (p = ioctl_tables; p->cmd; p++) {
2191 return p->func(client, arg);
2193 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n",
2194 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2199 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2201 struct snd_seq_client *client = file->private_data;
2203 snd_assert(client != NULL, return -ENXIO);
2205 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2208 #ifdef CONFIG_COMPAT
2209 #include "seq_compat.c"
2211 #define snd_seq_ioctl_compat NULL
2214 /* -------------------------------------------------------- */
2217 /* exported to kernel modules */
2218 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2219 const char *name_fmt, ...)
2221 struct snd_seq_client *client;
2224 snd_assert(! in_interrupt(), return -EBUSY);
2226 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2228 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2231 if (mutex_lock_interruptible(®ister_mutex))
2232 return -ERESTARTSYS;
2235 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2236 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2237 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2241 /* empty write queue as default */
2242 client = seq_create_client1(client_index, 0);
2243 if (client == NULL) {
2244 mutex_unlock(®ister_mutex);
2245 return -EBUSY; /* failure code */
2247 usage_alloc(&client_usage, 1);
2249 client->accept_input = 1;
2250 client->accept_output = 1;
2252 va_start(args, name_fmt);
2253 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2256 client->type = KERNEL_CLIENT;
2257 mutex_unlock(®ister_mutex);
2259 /* make others aware this new client */
2260 snd_seq_system_client_ev_client_start(client->number);
2262 /* return client number to caller */
2263 return client->number;
2266 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2268 /* exported to kernel modules */
2269 int snd_seq_delete_kernel_client(int client)
2271 struct snd_seq_client *ptr;
2273 snd_assert(! in_interrupt(), return -EBUSY);
2275 ptr = clientptr(client);
2279 seq_free_client(ptr);
2284 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2286 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2287 * and snd_seq_kernel_client_enqueue_blocking
2289 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2290 struct file *file, int blocking,
2291 int atomic, int hop)
2293 struct snd_seq_client *cptr;
2296 snd_assert(ev != NULL, return -EINVAL);
2298 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2299 return 0; /* ignore this */
2300 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2301 return -EINVAL; /* quoted events can't be enqueued */
2303 /* fill in client number */
2304 ev->source.client = client;
2306 if (check_event_type_and_length(ev))
2309 cptr = snd_seq_client_use_ptr(client);
2313 if (! cptr->accept_output)
2316 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2318 snd_seq_client_unlock(cptr);
2323 * exported, called by kernel clients to enqueue events (w/o blocking)
2325 * RETURN VALUE: zero if succeed, negative if error
2327 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2328 int atomic, int hop)
2330 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2333 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2336 * exported, called by kernel clients to enqueue events (with blocking)
2338 * RETURN VALUE: zero if succeed, negative if error
2340 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2342 int atomic, int hop)
2344 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2347 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2350 * exported, called by kernel clients to dispatch events directly to other
2351 * clients, bypassing the queues. Event time-stamp will be updated.
2353 * RETURN VALUE: negative = delivery failed,
2354 * zero, or positive: the number of delivered events
2356 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2357 int atomic, int hop)
2359 struct snd_seq_client *cptr;
2362 snd_assert(ev != NULL, return -EINVAL);
2364 /* fill in client number */
2365 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2366 ev->source.client = client;
2368 if (check_event_type_and_length(ev))
2371 cptr = snd_seq_client_use_ptr(client);
2375 if (!cptr->accept_output)
2378 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2380 snd_seq_client_unlock(cptr);
2384 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2387 * exported, called by kernel clients to perform same functions as with
2390 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2392 struct snd_seq_client *client;
2396 client = clientptr(clientid);
2399 fs = snd_enter_user();
2400 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg);
2405 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2407 /* exported (for OSS emulator) */
2408 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2410 struct snd_seq_client *client;
2412 client = clientptr(clientid);
2416 if (! snd_seq_write_pool_allocated(client))
2418 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2423 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2425 /*---------------------------------------------------------------------------*/
2427 #ifdef CONFIG_PROC_FS
2431 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2432 struct snd_seq_port_subs_info *group,
2433 int is_src, char *msg)
2435 struct list_head *p;
2436 struct snd_seq_subscribers *s;
2439 down_read(&group->list_mutex);
2440 if (list_empty(&group->list_head)) {
2441 up_read(&group->list_mutex);
2444 snd_iprintf(buffer, msg);
2445 list_for_each(p, &group->list_head) {
2447 s = list_entry(p, struct snd_seq_subscribers, src_list);
2449 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2451 snd_iprintf(buffer, ", ");
2452 snd_iprintf(buffer, "%d:%d",
2453 is_src ? s->info.dest.client : s->info.sender.client,
2454 is_src ? s->info.dest.port : s->info.sender.port);
2455 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2456 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2457 if (group->exclusive)
2458 snd_iprintf(buffer, "[ex]");
2460 up_read(&group->list_mutex);
2461 snd_iprintf(buffer, "\n");
2464 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2465 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2466 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2468 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2470 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2471 struct snd_seq_client *client)
2473 struct snd_seq_client_port *p;
2475 mutex_lock(&client->ports_mutex);
2476 list_for_each_entry(p, &client->ports_list_head, list) {
2477 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2478 p->addr.port, p->name,
2479 FLAG_PERM_RD(p->capability),
2480 FLAG_PERM_WR(p->capability),
2481 FLAG_PERM_EX(p->capability),
2482 FLAG_PERM_DUPLEX(p->capability));
2483 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2484 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2486 mutex_unlock(&client->ports_mutex);
2490 void snd_seq_info_pool(struct snd_info_buffer *buffer,
2491 struct snd_seq_pool *pool, char *space);
2493 /* exported to seq_info.c */
2494 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2495 struct snd_info_buffer *buffer)
2498 struct snd_seq_client *client;
2500 snd_iprintf(buffer, "Client info\n");
2501 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2502 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2503 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2504 snd_iprintf(buffer, "\n");
2506 /* list the client table */
2507 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2508 client = snd_seq_client_use_ptr(c);
2511 if (client->type == NO_CLIENT) {
2512 snd_seq_client_unlock(client);
2516 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2518 client->type == USER_CLIENT ? "User" : "Kernel");
2519 snd_seq_info_dump_ports(buffer, client);
2520 if (snd_seq_write_pool_allocated(client)) {
2521 snd_iprintf(buffer, " Output pool :\n");
2522 snd_seq_info_pool(buffer, client->pool, " ");
2524 if (client->type == USER_CLIENT && client->data.user.fifo &&
2525 client->data.user.fifo->pool) {
2526 snd_iprintf(buffer, " Input pool :\n");
2527 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2529 snd_seq_client_unlock(client);
2532 #endif /* CONFIG_PROC_FS */
2534 /*---------------------------------------------------------------------------*/
2541 static const struct file_operations snd_seq_f_ops =
2543 .owner = THIS_MODULE,
2544 .read = snd_seq_read,
2545 .write = snd_seq_write,
2546 .open = snd_seq_open,
2547 .release = snd_seq_release,
2548 .poll = snd_seq_poll,
2549 .unlocked_ioctl = snd_seq_ioctl,
2550 .compat_ioctl = snd_seq_ioctl_compat,
2554 * register sequencer device
2556 int __init snd_sequencer_device_init(void)
2560 if (mutex_lock_interruptible(®ister_mutex))
2561 return -ERESTARTSYS;
2563 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2564 &snd_seq_f_ops, NULL, "seq")) < 0) {
2565 mutex_unlock(®ister_mutex);
2569 mutex_unlock(®ister_mutex);
2577 * unregister sequencer device
2579 void __exit snd_sequencer_device_done(void)
2581 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);