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>
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/slab.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <linux/kmod.h>
31 #include <sound/seq_kernel.h>
32 #include "seq_clientmgr.h"
33 #include "seq_memory.h"
34 #include "seq_queue.h"
35 #include "seq_timer.h"
37 #include "seq_system.h"
38 #include <sound/seq_device.h>
40 #include <linux/compat.h>
45 * this module handles the connections of userland and kernel clients
50 * There are four ranges of client numbers (last two shared):
51 * 0..15: global clients
52 * 16..127: statically allocated client numbers for cards 0..27
53 * 128..191: dynamically allocated client numbers for cards 28..31
54 * 128..191: dynamically allocated client numbers for applications
57 /* number of kernel non-card clients */
58 #define SNDRV_SEQ_GLOBAL_CLIENTS 16
59 /* clients per cards, for static clients */
60 #define SNDRV_SEQ_CLIENTS_PER_CARD 4
61 /* dynamically allocated client numbers (both kernel drivers and user space) */
62 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
64 #define SNDRV_SEQ_LFLG_INPUT 0x0001
65 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
66 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
68 static DEFINE_SPINLOCK(clients_lock);
69 static DEFINE_MUTEX(register_mutex);
74 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
75 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
76 static struct snd_seq_usage client_usage;
81 static int bounce_error_event(struct snd_seq_client *client,
82 struct snd_seq_event *event,
83 int err, int atomic, int hop);
84 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
85 struct snd_seq_event *event,
86 int filter, int atomic, int hop);
91 static inline mm_segment_t snd_enter_user(void)
93 mm_segment_t fs = get_fs();
98 static inline void snd_leave_user(mm_segment_t fs)
105 static inline unsigned short snd_seq_file_flags(struct file *file)
107 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
109 return SNDRV_SEQ_LFLG_OUTPUT;
111 return SNDRV_SEQ_LFLG_INPUT;
113 return SNDRV_SEQ_LFLG_OPEN;
117 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
119 return snd_seq_total_cells(client->pool) > 0;
122 /* return pointer to client structure for specified id */
123 static struct snd_seq_client *clientptr(int clientid)
125 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
126 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
130 return clienttab[clientid];
133 extern int seq_client_load[];
135 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
138 struct snd_seq_client *client;
140 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
141 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
145 spin_lock_irqsave(&clients_lock, flags);
146 client = clientptr(clientid);
149 if (clienttablock[clientid]) {
150 spin_unlock_irqrestore(&clients_lock, flags);
153 spin_unlock_irqrestore(&clients_lock, flags);
155 if (!in_interrupt() && current->fs->root) {
156 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
157 static char card_requested[SNDRV_CARDS];
158 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
161 if (! client_requested[clientid] && current->fs->root) {
162 client_requested[clientid] = 1;
163 for (idx = 0; idx < 15; idx++) {
164 if (seq_client_load[idx] < 0)
166 if (seq_client_load[idx] == clientid) {
167 request_module("snd-seq-client-%i",
173 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
174 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
175 SNDRV_SEQ_CLIENTS_PER_CARD;
176 if (card < snd_ecards_limit) {
177 if (! card_requested[card]) {
178 card_requested[card] = 1;
179 snd_request_card(card);
181 snd_seq_device_load_drivers();
184 spin_lock_irqsave(&clients_lock, flags);
185 client = clientptr(clientid);
188 spin_unlock_irqrestore(&clients_lock, flags);
194 snd_use_lock_use(&client->use_lock);
195 spin_unlock_irqrestore(&clients_lock, flags);
199 static void usage_alloc(struct snd_seq_usage *res, int num)
202 if (res->cur > res->peak)
203 res->peak = res->cur;
206 static void usage_free(struct snd_seq_usage *res, int num)
211 /* initialise data structures */
212 int __init client_init_data(void)
214 /* zap out the client table */
215 memset(&clienttablock, 0, sizeof(clienttablock));
216 memset(&clienttab, 0, sizeof(clienttab));
221 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
225 struct snd_seq_client *client;
227 /* init client data */
228 client = kzalloc(sizeof(*client), GFP_KERNEL);
231 client->pool = snd_seq_pool_new(poolsize);
232 if (client->pool == NULL) {
236 client->type = NO_CLIENT;
237 snd_use_lock_init(&client->use_lock);
238 rwlock_init(&client->ports_lock);
239 mutex_init(&client->ports_mutex);
240 INIT_LIST_HEAD(&client->ports_list_head);
242 /* find free slot in the client table */
243 spin_lock_irqsave(&clients_lock, flags);
244 if (client_index < 0) {
245 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
246 c < SNDRV_SEQ_MAX_CLIENTS;
248 if (clienttab[c] || clienttablock[c])
250 clienttab[client->number = c] = client;
251 spin_unlock_irqrestore(&clients_lock, flags);
255 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
256 clienttab[client->number = client_index] = client;
257 spin_unlock_irqrestore(&clients_lock, flags);
261 spin_unlock_irqrestore(&clients_lock, flags);
262 snd_seq_pool_delete(&client->pool);
264 return NULL; /* no free slot found or busy, return failure code */
268 static int seq_free_client1(struct snd_seq_client *client)
272 snd_assert(client != NULL, return -EINVAL);
273 snd_seq_delete_all_ports(client);
274 snd_seq_queue_client_leave(client->number);
275 spin_lock_irqsave(&clients_lock, flags);
276 clienttablock[client->number] = 1;
277 clienttab[client->number] = NULL;
278 spin_unlock_irqrestore(&clients_lock, flags);
279 snd_use_lock_sync(&client->use_lock);
280 snd_seq_queue_client_termination(client->number);
282 snd_seq_pool_delete(&client->pool);
283 spin_lock_irqsave(&clients_lock, flags);
284 clienttablock[client->number] = 0;
285 spin_unlock_irqrestore(&clients_lock, flags);
290 static void seq_free_client(struct snd_seq_client * client)
292 mutex_lock(®ister_mutex);
293 switch (client->type) {
295 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
300 seq_free_client1(client);
301 usage_free(&client_usage, 1);
305 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
306 client->number, client->type);
308 mutex_unlock(®ister_mutex);
310 snd_seq_system_client_ev_client_exit(client->number);
315 /* -------------------------------------------------------- */
317 /* create a user client */
318 static int snd_seq_open(struct inode *inode, struct file *file)
320 int c, mode; /* client id */
321 struct snd_seq_client *client;
322 struct snd_seq_user_client *user;
324 if (mutex_lock_interruptible(®ister_mutex))
326 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
327 if (client == NULL) {
328 mutex_unlock(®ister_mutex);
329 return -ENOMEM; /* failure code */
332 mode = snd_seq_file_flags(file);
333 if (mode & SNDRV_SEQ_LFLG_INPUT)
334 client->accept_input = 1;
335 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
336 client->accept_output = 1;
338 user = &client->data.user;
340 user->fifo_pool_size = 0;
342 if (mode & SNDRV_SEQ_LFLG_INPUT) {
343 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
344 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
345 if (user->fifo == NULL) {
346 seq_free_client1(client);
348 mutex_unlock(®ister_mutex);
353 usage_alloc(&client_usage, 1);
354 client->type = USER_CLIENT;
355 mutex_unlock(®ister_mutex);
358 file->private_data = client;
360 /* fill client data */
362 sprintf(client->name, "Client-%d", c);
364 /* make others aware this new client */
365 snd_seq_system_client_ev_client_start(c);
370 /* delete a user client */
371 static int snd_seq_release(struct inode *inode, struct file *file)
373 struct snd_seq_client *client = file->private_data;
376 seq_free_client(client);
377 if (client->data.user.fifo)
378 snd_seq_fifo_delete(&client->data.user.fifo);
386 /* handle client read() */
387 /* possible error values:
388 * -ENXIO invalid client or file open mode
389 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
390 * -EINVAL no enough user-space buffer to write the whole event
391 * -EFAULT seg. fault during copy to user space
393 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
396 struct snd_seq_client *client = file->private_data;
397 struct snd_seq_fifo *fifo;
400 struct snd_seq_event_cell *cell;
402 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
405 if (!access_ok(VERIFY_WRITE, buf, count))
408 /* check client structures are in place */
409 snd_assert(client != NULL, return -ENXIO);
411 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
414 if (atomic_read(&fifo->overflow) > 0) {
415 /* buffer overflow is detected */
416 snd_seq_fifo_clear(fifo);
417 /* return error code */
423 snd_seq_fifo_lock(fifo);
425 /* while data available in queue */
426 while (count >= sizeof(struct snd_seq_event)) {
429 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
430 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
433 if (snd_seq_ev_is_variable(&cell->event)) {
434 struct snd_seq_event tmpev;
436 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
437 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
441 count -= sizeof(struct snd_seq_event);
442 buf += sizeof(struct snd_seq_event);
443 err = snd_seq_expand_var_event(&cell->event, count,
444 (char __force *)buf, 0,
445 sizeof(struct snd_seq_event));
452 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
456 count -= sizeof(struct snd_seq_event);
457 buf += sizeof(struct snd_seq_event);
459 snd_seq_cell_free(cell);
460 cell = NULL; /* to be sure */
461 result += sizeof(struct snd_seq_event);
466 snd_seq_fifo_cell_putback(fifo, cell);
467 if (err == -EAGAIN && result > 0)
470 snd_seq_fifo_unlock(fifo);
472 return (err < 0) ? err : result;
477 * check access permission to the port
479 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
481 if ((port->capability & flags) != flags)
487 * check if the destination client is available, and return the pointer
488 * if filter is non-zero, client filter bitmap is tested.
490 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
493 struct snd_seq_client *dest;
495 dest = snd_seq_client_use_ptr(event->dest.client);
498 if (! dest->accept_input)
500 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
501 ! test_bit(event->type, dest->event_filter))
503 if (filter && !(dest->filter & filter))
506 return dest; /* ok - accessible */
508 snd_seq_client_unlock(dest);
514 * Return the error event.
516 * If the receiver client is a user client, the original event is
517 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
518 * the original event is also variable length, the external data is
519 * copied after the event record.
520 * If the receiver client is a kernel client, the original event is
521 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
524 static int bounce_error_event(struct snd_seq_client *client,
525 struct snd_seq_event *event,
526 int err, int atomic, int hop)
528 struct snd_seq_event bounce_ev;
531 if (client == NULL ||
532 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
533 ! client->accept_input)
534 return 0; /* ignored */
536 /* set up quoted error */
537 memset(&bounce_ev, 0, sizeof(bounce_ev));
538 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
539 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
540 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
541 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
542 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
543 bounce_ev.dest.client = client->number;
544 bounce_ev.dest.port = event->source.port;
545 bounce_ev.data.quote.origin = event->dest;
546 bounce_ev.data.quote.event = event;
547 bounce_ev.data.quote.value = -err; /* use positive value */
548 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
550 client->event_lost++;
559 * rewrite the time-stamp of the event record with the curren time
560 * of the given queue.
561 * return non-zero if updated.
563 static int update_timestamp_of_queue(struct snd_seq_event *event,
564 int queue, int real_time)
566 struct snd_seq_queue *q;
571 event->queue = queue;
572 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
574 event->time.time = snd_seq_timer_get_cur_time(q->timer);
575 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
577 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
578 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
586 * deliver an event to the specified destination.
587 * if filter is non-zero, client filter bitmap is tested.
589 * RETURN VALUE: 0 : if succeeded
592 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
593 struct snd_seq_event *event,
594 int filter, int atomic, int hop)
596 struct snd_seq_client *dest = NULL;
597 struct snd_seq_client_port *dest_port = NULL;
598 int result = -ENOENT;
601 direct = snd_seq_ev_is_direct(event);
603 dest = get_event_dest_client(event, filter);
606 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
607 if (dest_port == NULL)
610 /* check permission */
611 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
616 if (dest_port->timestamping)
617 update_timestamp_of_queue(event, dest_port->time_queue,
618 dest_port->time_real);
620 switch (dest->type) {
622 if (dest->data.user.fifo)
623 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
627 if (dest_port->event_input == NULL)
629 result = dest_port->event_input(event, direct,
630 dest_port->private_data,
639 snd_seq_port_unlock(dest_port);
641 snd_seq_client_unlock(dest);
643 if (result < 0 && !direct) {
644 result = bounce_error_event(client, event, result, atomic, hop);
651 * send the event to all subscribers:
653 static int deliver_to_subscribers(struct snd_seq_client *client,
654 struct snd_seq_event *event,
657 struct snd_seq_subscribers *subs;
658 int err = 0, num_ev = 0;
659 struct snd_seq_event event_saved;
660 struct snd_seq_client_port *src_port;
661 struct snd_seq_port_subs_info *grp;
663 src_port = snd_seq_port_use_ptr(client, event->source.port);
664 if (src_port == NULL)
665 return -EINVAL; /* invalid source port */
666 /* save original event record */
667 event_saved = *event;
668 grp = &src_port->c_src;
672 read_lock(&grp->list_lock);
674 down_read(&grp->list_mutex);
675 list_for_each_entry(subs, &grp->list_head, src_list) {
676 event->dest = subs->info.dest;
677 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
678 /* convert time according to flag with subscription */
679 update_timestamp_of_queue(event, subs->info.queue,
680 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
681 err = snd_seq_deliver_single_event(client, event,
686 /* restore original event record */
687 *event = event_saved;
690 read_unlock(&grp->list_lock);
692 up_read(&grp->list_mutex);
693 *event = event_saved; /* restore */
694 snd_seq_port_unlock(src_port);
695 return (err < 0) ? err : num_ev;
699 #ifdef SUPPORT_BROADCAST
701 * broadcast to all ports:
703 static int port_broadcast_event(struct snd_seq_client *client,
704 struct snd_seq_event *event,
707 int num_ev = 0, err = 0;
708 struct snd_seq_client *dest_client;
709 struct snd_seq_client_port *port;
711 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
712 if (dest_client == NULL)
713 return 0; /* no matching destination */
715 read_lock(&dest_client->ports_lock);
716 list_for_each_entry(port, &dest_client->ports_list_head, list) {
717 event->dest.port = port->addr.port;
718 /* pass NULL as source client to avoid error bounce */
719 err = snd_seq_deliver_single_event(NULL, event,
720 SNDRV_SEQ_FILTER_BROADCAST,
726 read_unlock(&dest_client->ports_lock);
727 snd_seq_client_unlock(dest_client);
728 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
729 return (err < 0) ? err : num_ev;
733 * send the event to all clients:
734 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
736 static int broadcast_event(struct snd_seq_client *client,
737 struct snd_seq_event *event, int atomic, int hop)
739 int err = 0, num_ev = 0;
741 struct snd_seq_addr addr;
743 addr = event->dest; /* save */
745 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
746 /* don't send to itself */
747 if (dest == client->number)
749 event->dest.client = dest;
750 event->dest.port = addr.port;
751 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
752 err = port_broadcast_event(client, event, atomic, hop);
754 /* pass NULL as source client to avoid error bounce */
755 err = snd_seq_deliver_single_event(NULL, event,
756 SNDRV_SEQ_FILTER_BROADCAST,
762 event->dest = addr; /* restore */
763 return (err < 0) ? err : num_ev;
767 /* multicast - not supported yet */
768 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
771 snd_printd("seq: multicast not supported yet.\n");
772 return 0; /* ignored */
774 #endif /* SUPPORT_BROADCAST */
777 /* deliver an event to the destination port(s).
778 * if the event is to subscribers or broadcast, the event is dispatched
779 * to multiple targets.
781 * RETURN VALUE: n > 0 : the number of delivered events.
782 * n == 0 : the event was not passed to any client.
783 * n < 0 : error - event was not processed.
785 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
791 if (hop >= SNDRV_SEQ_MAX_HOPS) {
792 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
793 event->source.client, event->source.port,
794 event->dest.client, event->dest.port);
798 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
799 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
800 result = deliver_to_subscribers(client, event, atomic, hop);
801 #ifdef SUPPORT_BROADCAST
802 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
803 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
804 result = broadcast_event(client, event, atomic, hop);
805 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
806 result = multicast_event(client, event, atomic, hop);
807 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
808 result = port_broadcast_event(client, event, atomic, hop);
811 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
817 * dispatch an event cell:
818 * This function is called only from queue check routines in timer
819 * interrupts or after enqueued.
820 * The event cell shall be released or re-queued in this function.
822 * RETURN VALUE: n > 0 : the number of delivered events.
823 * n == 0 : the event was not passed to any client.
824 * n < 0 : error - event was not processed.
826 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
828 struct snd_seq_client *client;
831 snd_assert(cell != NULL, return -EINVAL);
833 client = snd_seq_client_use_ptr(cell->event.source.client);
834 if (client == NULL) {
835 snd_seq_cell_free(cell); /* release this cell */
839 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
841 * the event cell is re-used as a NOTE-OFF event and
844 struct snd_seq_event tmpev, *ev;
846 /* reserve this event to enqueue note-off later */
848 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
849 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
852 * This was originally a note event. We now re-use the
853 * cell for the note-off event.
857 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
858 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
860 /* add the duration time */
861 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
862 case SNDRV_SEQ_TIME_STAMP_TICK:
863 ev->time.tick += ev->data.note.duration;
865 case SNDRV_SEQ_TIME_STAMP_REAL:
866 /* unit for duration is ms */
867 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
868 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
869 ev->time.time.tv_nsec / 1000000000;
870 ev->time.time.tv_nsec %= 1000000000;
873 ev->data.note.velocity = ev->data.note.off_velocity;
875 /* Now queue this cell as the note off event */
876 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
877 snd_seq_cell_free(cell); /* release this cell */
881 * event cell is freed after processing the event
884 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
885 snd_seq_cell_free(cell);
888 snd_seq_client_unlock(client);
893 /* Allocate a cell from client pool and enqueue it to queue:
894 * if pool is empty and blocking is TRUE, sleep until a new cell is
897 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
898 struct snd_seq_event *event,
899 struct file *file, int blocking,
902 struct snd_seq_event_cell *cell;
905 /* special queue values - force direct passing */
906 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
907 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
908 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
910 #ifdef SUPPORT_BROADCAST
911 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
912 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
913 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
916 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
917 /* check presence of source port */
918 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
919 if (src_port == NULL)
921 snd_seq_port_unlock(src_port);
924 /* direct event processing without enqueued */
925 if (snd_seq_ev_is_direct(event)) {
926 if (event->type == SNDRV_SEQ_EVENT_NOTE)
927 return -EINVAL; /* this event must be enqueued! */
928 return snd_seq_deliver_event(client, event, atomic, hop);
931 /* Not direct, normal queuing */
932 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
933 return -EINVAL; /* invalid queue */
934 if (! snd_seq_write_pool_allocated(client))
935 return -ENXIO; /* queue is not allocated */
937 /* allocate an event cell */
938 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
942 /* we got a cell. enqueue it. */
943 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
944 snd_seq_cell_free(cell);
953 * check validity of event type and data length.
954 * return non-zero if invalid.
956 static int check_event_type_and_length(struct snd_seq_event *ev)
958 switch (snd_seq_ev_length_type(ev)) {
959 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
960 if (snd_seq_ev_is_variable_type(ev))
963 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
964 if (! snd_seq_ev_is_variable_type(ev) ||
965 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
968 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
969 if (! snd_seq_ev_is_direct(ev))
978 /* possible error values:
979 * -ENXIO invalid client or file open mode
980 * -ENOMEM malloc failed
981 * -EFAULT seg. fault during copy from user space
982 * -EINVAL invalid event
983 * -EAGAIN no space in output pool
984 * -EINTR interrupts while sleep
985 * -EMLINK too many hops
986 * others depends on return value from driver callback
988 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
989 size_t count, loff_t *offset)
991 struct snd_seq_client *client = file->private_data;
992 int written = 0, len;
994 struct snd_seq_event event;
996 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
999 /* check client structures are in place */
1000 snd_assert(client != NULL, return -ENXIO);
1002 if (!client->accept_output || client->pool == NULL)
1005 /* allocate the pool now if the pool is not allocated yet */
1006 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1007 if (snd_seq_pool_init(client->pool) < 0)
1011 /* only process whole events */
1012 while (count >= sizeof(struct snd_seq_event)) {
1013 /* Read in the event header from the user */
1014 len = sizeof(event);
1015 if (copy_from_user(&event, buf, len)) {
1019 event.source.client = client->number; /* fill in client number */
1020 /* Check for extension data length */
1021 if (check_event_type_and_length(&event)) {
1026 /* check for special events */
1027 if (event.type == SNDRV_SEQ_EVENT_NONE)
1029 else if (snd_seq_ev_is_reserved(&event)) {
1034 if (snd_seq_ev_is_variable(&event)) {
1035 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1036 if ((size_t)(extlen + len) > count) {
1037 /* back out, will get an error this time or next */
1041 /* set user space pointer */
1042 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1043 event.data.ext.ptr = (char __force *)buf
1044 + sizeof(struct snd_seq_event);
1045 len += extlen; /* increment data length */
1047 #ifdef CONFIG_COMPAT
1048 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1049 void *ptr = compat_ptr(event.data.raw32.d[1]);
1050 event.data.ext.ptr = ptr;
1055 /* ok, enqueue it */
1056 err = snd_seq_client_enqueue_event(client, &event, file,
1057 !(file->f_flags & O_NONBLOCK),
1063 /* Update pointers and counts */
1069 return written ? written : err;
1076 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1078 struct snd_seq_client *client = file->private_data;
1079 unsigned int mask = 0;
1081 /* check client structures are in place */
1082 snd_assert(client != NULL, return -ENXIO);
1084 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1085 client->data.user.fifo) {
1087 /* check if data is available in the outqueue */
1088 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1089 mask |= POLLIN | POLLRDNORM;
1092 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1094 /* check if data is available in the pool */
1095 if (!snd_seq_write_pool_allocated(client) ||
1096 snd_seq_pool_poll_wait(client->pool, file, wait))
1097 mask |= POLLOUT | POLLWRNORM;
1104 /*-----------------------------------------------------*/
1107 /* SYSTEM_INFO ioctl() */
1108 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1110 struct snd_seq_system_info info;
1112 memset(&info, 0, sizeof(info));
1113 /* fill the info fields */
1114 info.queues = SNDRV_SEQ_MAX_QUEUES;
1115 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1116 info.ports = 256; /* fixed limit */
1117 info.channels = 256; /* fixed limit */
1118 info.cur_clients = client_usage.cur;
1119 info.cur_queues = snd_seq_queue_get_cur_queues();
1121 if (copy_to_user(arg, &info, sizeof(info)))
1127 /* RUNNING_MODE ioctl() */
1128 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1130 struct snd_seq_running_info info;
1131 struct snd_seq_client *cptr;
1134 if (copy_from_user(&info, arg, sizeof(info)))
1137 /* requested client number */
1138 cptr = snd_seq_client_use_ptr(info.client);
1140 return -ENOENT; /* don't change !!! */
1142 #ifdef SNDRV_BIG_ENDIAN
1143 if (! info.big_endian) {
1148 if (info.big_endian) {
1154 if (info.cpu_mode > sizeof(long)) {
1158 cptr->convert32 = (info.cpu_mode < sizeof(long));
1160 snd_seq_client_unlock(cptr);
1164 /* CLIENT_INFO ioctl() */
1165 static void get_client_info(struct snd_seq_client *cptr,
1166 struct snd_seq_client_info *info)
1168 info->client = cptr->number;
1170 /* fill the info fields */
1171 info->type = cptr->type;
1172 strcpy(info->name, cptr->name);
1173 info->filter = cptr->filter;
1174 info->event_lost = cptr->event_lost;
1175 memcpy(info->event_filter, cptr->event_filter, 32);
1176 info->num_ports = cptr->num_ports;
1177 memset(info->reserved, 0, sizeof(info->reserved));
1180 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1183 struct snd_seq_client *cptr;
1184 struct snd_seq_client_info client_info;
1186 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1189 /* requested client number */
1190 cptr = snd_seq_client_use_ptr(client_info.client);
1192 return -ENOENT; /* don't change !!! */
1194 get_client_info(cptr, &client_info);
1195 snd_seq_client_unlock(cptr);
1197 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1203 /* CLIENT_INFO ioctl() */
1204 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1207 struct snd_seq_client_info client_info;
1209 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1212 /* it is not allowed to set the info fields for an another client */
1213 if (client->number != client_info.client)
1215 /* also client type must be set now */
1216 if (client->type != client_info.type)
1219 /* fill the info fields */
1220 if (client_info.name[0])
1221 strlcpy(client->name, client_info.name, sizeof(client->name));
1223 client->filter = client_info.filter;
1224 client->event_lost = client_info.event_lost;
1225 memcpy(client->event_filter, client_info.event_filter, 32);
1232 * CREATE PORT ioctl()
1234 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1237 struct snd_seq_client_port *port;
1238 struct snd_seq_port_info info;
1239 struct snd_seq_port_callback *callback;
1241 if (copy_from_user(&info, arg, sizeof(info)))
1244 /* it is not allowed to create the port for an another client */
1245 if (info.addr.client != client->number)
1248 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1252 if (client->type == USER_CLIENT && info.kernel) {
1253 snd_seq_delete_port(client, port->addr.port);
1256 if (client->type == KERNEL_CLIENT) {
1257 if ((callback = info.kernel) != NULL) {
1258 if (callback->owner)
1259 port->owner = callback->owner;
1260 port->private_data = callback->private_data;
1261 port->private_free = callback->private_free;
1262 port->callback_all = callback->callback_all;
1263 port->event_input = callback->event_input;
1264 port->c_src.open = callback->subscribe;
1265 port->c_src.close = callback->unsubscribe;
1266 port->c_dest.open = callback->use;
1267 port->c_dest.close = callback->unuse;
1271 info.addr = port->addr;
1273 snd_seq_set_port_info(port, &info);
1274 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1276 if (copy_to_user(arg, &info, sizeof(info)))
1283 * DELETE PORT ioctl()
1285 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1288 struct snd_seq_port_info info;
1291 /* set passed parameters */
1292 if (copy_from_user(&info, arg, sizeof(info)))
1295 /* it is not allowed to remove the port for an another client */
1296 if (info.addr.client != client->number)
1299 err = snd_seq_delete_port(client, info.addr.port);
1301 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1307 * GET_PORT_INFO ioctl() (on any client)
1309 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1312 struct snd_seq_client *cptr;
1313 struct snd_seq_client_port *port;
1314 struct snd_seq_port_info info;
1316 if (copy_from_user(&info, arg, sizeof(info)))
1318 cptr = snd_seq_client_use_ptr(info.addr.client);
1322 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1324 snd_seq_client_unlock(cptr);
1325 return -ENOENT; /* don't change */
1329 snd_seq_get_port_info(port, &info);
1330 snd_seq_port_unlock(port);
1331 snd_seq_client_unlock(cptr);
1333 if (copy_to_user(arg, &info, sizeof(info)))
1340 * SET_PORT_INFO ioctl() (only ports on this/own client)
1342 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1345 struct snd_seq_client_port *port;
1346 struct snd_seq_port_info info;
1348 if (copy_from_user(&info, arg, sizeof(info)))
1351 if (info.addr.client != client->number) /* only set our own ports ! */
1353 port = snd_seq_port_use_ptr(client, info.addr.port);
1355 snd_seq_set_port_info(port, &info);
1356 snd_seq_port_unlock(port);
1363 * port subscription (connection)
1365 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1366 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1368 static int check_subscription_permission(struct snd_seq_client *client,
1369 struct snd_seq_client_port *sport,
1370 struct snd_seq_client_port *dport,
1371 struct snd_seq_port_subscribe *subs)
1373 if (client->number != subs->sender.client &&
1374 client->number != subs->dest.client) {
1375 /* connection by third client - check export permission */
1376 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1378 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1382 /* check read permission */
1383 /* if sender or receiver is the subscribing client itself,
1384 * no permission check is necessary
1386 if (client->number != subs->sender.client) {
1387 if (! check_port_perm(sport, PERM_RD))
1390 /* check write permission */
1391 if (client->number != subs->dest.client) {
1392 if (! check_port_perm(dport, PERM_WR))
1399 * send an subscription notify event to user client:
1400 * client must be user client.
1402 int snd_seq_client_notify_subscription(int client, int port,
1403 struct snd_seq_port_subscribe *info,
1406 struct snd_seq_event event;
1408 memset(&event, 0, sizeof(event));
1409 event.type = evtype;
1410 event.data.connect.dest = info->dest;
1411 event.data.connect.sender = info->sender;
1413 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1418 * add to port's subscription list IOCTL interface
1420 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1423 int result = -EINVAL;
1424 struct snd_seq_client *receiver = NULL, *sender = NULL;
1425 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1426 struct snd_seq_port_subscribe subs;
1428 if (copy_from_user(&subs, arg, sizeof(subs)))
1431 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1433 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1435 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1437 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1440 result = check_subscription_permission(client, sport, dport, &subs);
1445 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1446 if (! result) /* broadcast announce */
1447 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1448 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1451 snd_seq_port_unlock(sport);
1453 snd_seq_port_unlock(dport);
1455 snd_seq_client_unlock(sender);
1457 snd_seq_client_unlock(receiver);
1463 * remove from port's subscription list
1465 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1468 int result = -ENXIO;
1469 struct snd_seq_client *receiver = NULL, *sender = NULL;
1470 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1471 struct snd_seq_port_subscribe subs;
1473 if (copy_from_user(&subs, arg, sizeof(subs)))
1476 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1478 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1480 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1482 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1485 result = check_subscription_permission(client, sport, dport, &subs);
1489 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1490 if (! result) /* broadcast announce */
1491 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1492 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1495 snd_seq_port_unlock(sport);
1497 snd_seq_port_unlock(dport);
1499 snd_seq_client_unlock(sender);
1501 snd_seq_client_unlock(receiver);
1506 /* CREATE_QUEUE ioctl() */
1507 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1510 struct snd_seq_queue_info info;
1512 struct snd_seq_queue *q;
1514 if (copy_from_user(&info, arg, sizeof(info)))
1517 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1521 q = queueptr(result);
1525 info.queue = q->queue;
1526 info.locked = q->locked;
1527 info.owner = q->owner;
1529 /* set queue name */
1531 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1532 strlcpy(q->name, info.name, sizeof(q->name));
1535 if (copy_to_user(arg, &info, sizeof(info)))
1541 /* DELETE_QUEUE ioctl() */
1542 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1545 struct snd_seq_queue_info info;
1547 if (copy_from_user(&info, arg, sizeof(info)))
1550 return snd_seq_queue_delete(client->number, info.queue);
1553 /* GET_QUEUE_INFO ioctl() */
1554 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1557 struct snd_seq_queue_info info;
1558 struct snd_seq_queue *q;
1560 if (copy_from_user(&info, arg, sizeof(info)))
1563 q = queueptr(info.queue);
1567 memset(&info, 0, sizeof(info));
1568 info.queue = q->queue;
1569 info.owner = q->owner;
1570 info.locked = q->locked;
1571 strlcpy(info.name, q->name, sizeof(info.name));
1574 if (copy_to_user(arg, &info, sizeof(info)))
1580 /* SET_QUEUE_INFO ioctl() */
1581 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1584 struct snd_seq_queue_info info;
1585 struct snd_seq_queue *q;
1587 if (copy_from_user(&info, arg, sizeof(info)))
1590 if (info.owner != client->number)
1593 /* change owner/locked permission */
1594 if (snd_seq_queue_check_access(info.queue, client->number)) {
1595 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1598 snd_seq_queue_use(info.queue, client->number, 1);
1603 q = queueptr(info.queue);
1606 if (q->owner != client->number) {
1610 strlcpy(q->name, info.name, sizeof(q->name));
1616 /* GET_NAMED_QUEUE ioctl() */
1617 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1619 struct snd_seq_queue_info info;
1620 struct snd_seq_queue *q;
1622 if (copy_from_user(&info, arg, sizeof(info)))
1625 q = snd_seq_queue_find_name(info.name);
1628 info.queue = q->queue;
1629 info.owner = q->owner;
1630 info.locked = q->locked;
1633 if (copy_to_user(arg, &info, sizeof(info)))
1639 /* GET_QUEUE_STATUS ioctl() */
1640 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1643 struct snd_seq_queue_status status;
1644 struct snd_seq_queue *queue;
1645 struct snd_seq_timer *tmr;
1647 if (copy_from_user(&status, arg, sizeof(status)))
1650 queue = queueptr(status.queue);
1653 memset(&status, 0, sizeof(status));
1654 status.queue = queue->queue;
1657 status.events = queue->tickq->cells + queue->timeq->cells;
1659 status.time = snd_seq_timer_get_cur_time(tmr);
1660 status.tick = snd_seq_timer_get_cur_tick(tmr);
1662 status.running = tmr->running;
1664 status.flags = queue->flags;
1667 if (copy_to_user(arg, &status, sizeof(status)))
1673 /* GET_QUEUE_TEMPO ioctl() */
1674 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1677 struct snd_seq_queue_tempo tempo;
1678 struct snd_seq_queue *queue;
1679 struct snd_seq_timer *tmr;
1681 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1684 queue = queueptr(tempo.queue);
1687 memset(&tempo, 0, sizeof(tempo));
1688 tempo.queue = queue->queue;
1692 tempo.tempo = tmr->tempo;
1693 tempo.ppq = tmr->ppq;
1694 tempo.skew_value = tmr->skew;
1695 tempo.skew_base = tmr->skew_base;
1698 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1704 /* SET_QUEUE_TEMPO ioctl() */
1705 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1707 if (!snd_seq_queue_check_access(tempo->queue, client))
1709 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1712 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1714 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1718 struct snd_seq_queue_tempo tempo;
1720 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1723 result = snd_seq_set_queue_tempo(client->number, &tempo);
1724 return result < 0 ? result : 0;
1728 /* GET_QUEUE_TIMER ioctl() */
1729 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1732 struct snd_seq_queue_timer timer;
1733 struct snd_seq_queue *queue;
1734 struct snd_seq_timer *tmr;
1736 if (copy_from_user(&timer, arg, sizeof(timer)))
1739 queue = queueptr(timer.queue);
1743 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1745 return -ERESTARTSYS;
1748 memset(&timer, 0, sizeof(timer));
1749 timer.queue = queue->queue;
1751 timer.type = tmr->type;
1752 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1753 timer.u.alsa.id = tmr->alsa_id;
1754 timer.u.alsa.resolution = tmr->preferred_resolution;
1756 mutex_unlock(&queue->timer_mutex);
1759 if (copy_to_user(arg, &timer, sizeof(timer)))
1765 /* SET_QUEUE_TIMER ioctl() */
1766 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1770 struct snd_seq_queue_timer timer;
1772 if (copy_from_user(&timer, arg, sizeof(timer)))
1775 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1778 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1779 struct snd_seq_queue *q;
1780 struct snd_seq_timer *tmr;
1782 q = queueptr(timer.queue);
1785 if (mutex_lock_interruptible(&q->timer_mutex)) {
1787 return -ERESTARTSYS;
1790 snd_seq_queue_timer_close(timer.queue);
1791 tmr->type = timer.type;
1792 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1793 tmr->alsa_id = timer.u.alsa.id;
1794 tmr->preferred_resolution = timer.u.alsa.resolution;
1796 result = snd_seq_queue_timer_open(timer.queue);
1797 mutex_unlock(&q->timer_mutex);
1807 /* GET_QUEUE_CLIENT ioctl() */
1808 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1811 struct snd_seq_queue_client info;
1814 if (copy_from_user(&info, arg, sizeof(info)))
1817 used = snd_seq_queue_is_used(info.queue, client->number);
1821 info.client = client->number;
1823 if (copy_to_user(arg, &info, sizeof(info)))
1829 /* SET_QUEUE_CLIENT ioctl() */
1830 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1834 struct snd_seq_queue_client info;
1836 if (copy_from_user(&info, arg, sizeof(info)))
1839 if (info.used >= 0) {
1840 err = snd_seq_queue_use(info.queue, client->number, info.used);
1845 return snd_seq_ioctl_get_queue_client(client, arg);
1849 /* GET_CLIENT_POOL ioctl() */
1850 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1853 struct snd_seq_client_pool info;
1854 struct snd_seq_client *cptr;
1856 if (copy_from_user(&info, arg, sizeof(info)))
1859 cptr = snd_seq_client_use_ptr(info.client);
1862 memset(&info, 0, sizeof(info));
1863 info.output_pool = cptr->pool->size;
1864 info.output_room = cptr->pool->room;
1865 info.output_free = info.output_pool;
1866 info.output_free = snd_seq_unused_cells(cptr->pool);
1867 if (cptr->type == USER_CLIENT) {
1868 info.input_pool = cptr->data.user.fifo_pool_size;
1869 info.input_free = info.input_pool;
1870 if (cptr->data.user.fifo)
1871 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1873 info.input_pool = 0;
1874 info.input_free = 0;
1876 snd_seq_client_unlock(cptr);
1878 if (copy_to_user(arg, &info, sizeof(info)))
1883 /* SET_CLIENT_POOL ioctl() */
1884 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1887 struct snd_seq_client_pool info;
1890 if (copy_from_user(&info, arg, sizeof(info)))
1893 if (client->number != info.client)
1894 return -EINVAL; /* can't change other clients */
1896 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1897 (! snd_seq_write_pool_allocated(client) ||
1898 info.output_pool != client->pool->size)) {
1899 if (snd_seq_write_pool_allocated(client)) {
1900 /* remove all existing cells */
1901 snd_seq_queue_client_leave_cells(client->number);
1902 snd_seq_pool_done(client->pool);
1904 client->pool->size = info.output_pool;
1905 rc = snd_seq_pool_init(client->pool);
1909 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1910 info.input_pool >= 1 &&
1911 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1912 info.input_pool != client->data.user.fifo_pool_size) {
1913 /* change pool size */
1914 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1917 client->data.user.fifo_pool_size = info.input_pool;
1919 if (info.output_room >= 1 &&
1920 info.output_room <= client->pool->size) {
1921 client->pool->room = info.output_room;
1924 return snd_seq_ioctl_get_client_pool(client, arg);
1928 /* REMOVE_EVENTS ioctl() */
1929 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1932 struct snd_seq_remove_events info;
1934 if (copy_from_user(&info, arg, sizeof(info)))
1938 * Input mostly not implemented XXX.
1940 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1942 * No restrictions so for a user client we can clear
1945 if (client->type == USER_CLIENT)
1946 snd_seq_fifo_clear(client->data.user.fifo);
1949 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1950 snd_seq_queue_remove_cells(client->number, &info);
1957 * get subscription info
1959 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1963 struct snd_seq_client *sender = NULL;
1964 struct snd_seq_client_port *sport = NULL;
1965 struct snd_seq_port_subscribe subs;
1966 struct snd_seq_subscribers *p;
1968 if (copy_from_user(&subs, arg, sizeof(subs)))
1972 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1974 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1976 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1985 snd_seq_port_unlock(sport);
1987 snd_seq_client_unlock(sender);
1989 if (copy_to_user(arg, &subs, sizeof(subs)))
1997 * get subscription info - check only its presence
1999 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2002 int result = -ENXIO;
2003 struct snd_seq_client *cptr = NULL;
2004 struct snd_seq_client_port *port = NULL;
2005 struct snd_seq_query_subs subs;
2006 struct snd_seq_port_subs_info *group;
2007 struct list_head *p;
2010 if (copy_from_user(&subs, arg, sizeof(subs)))
2013 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2015 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2018 switch (subs.type) {
2019 case SNDRV_SEQ_QUERY_SUBS_READ:
2020 group = &port->c_src;
2022 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2023 group = &port->c_dest;
2029 down_read(&group->list_mutex);
2030 /* search for the subscriber */
2031 subs.num_subs = group->count;
2034 list_for_each(p, &group->list_head) {
2035 if (i++ == subs.index) {
2037 struct snd_seq_subscribers *s;
2038 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2039 s = list_entry(p, struct snd_seq_subscribers, src_list);
2040 subs.addr = s->info.dest;
2042 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2043 subs.addr = s->info.sender;
2045 subs.flags = s->info.flags;
2046 subs.queue = s->info.queue;
2051 up_read(&group->list_mutex);
2055 snd_seq_port_unlock(port);
2057 snd_seq_client_unlock(cptr);
2059 if (copy_to_user(arg, &subs, sizeof(subs)))
2069 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2072 struct snd_seq_client *cptr = NULL;
2073 struct snd_seq_client_info info;
2075 if (copy_from_user(&info, arg, sizeof(info)))
2078 /* search for next client */
2080 if (info.client < 0)
2082 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2083 cptr = snd_seq_client_use_ptr(info.client);
2090 get_client_info(cptr, &info);
2091 snd_seq_client_unlock(cptr);
2093 if (copy_to_user(arg, &info, sizeof(info)))
2101 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2104 struct snd_seq_client *cptr;
2105 struct snd_seq_client_port *port = NULL;
2106 struct snd_seq_port_info info;
2108 if (copy_from_user(&info, arg, sizeof(info)))
2110 cptr = snd_seq_client_use_ptr(info.addr.client);
2114 /* search for next port */
2116 port = snd_seq_port_query_nearest(cptr, &info);
2118 snd_seq_client_unlock(cptr);
2123 info.addr = port->addr;
2124 snd_seq_get_port_info(port, &info);
2125 snd_seq_port_unlock(port);
2126 snd_seq_client_unlock(cptr);
2128 if (copy_to_user(arg, &info, sizeof(info)))
2133 /* -------------------------------------------------------- */
2135 static struct seq_ioctl_table {
2137 int (*func)(struct snd_seq_client *client, void __user * arg);
2138 } ioctl_tables[] = {
2139 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2140 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2141 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2142 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2143 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2144 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2145 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2146 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2147 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2148 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2149 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2150 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2151 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2152 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2153 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2154 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2155 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2156 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2157 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2158 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2159 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2160 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2161 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2162 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2163 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2164 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2165 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2166 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2167 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2171 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2174 struct seq_ioctl_table *p;
2177 case SNDRV_SEQ_IOCTL_PVERSION:
2178 /* return sequencer version number */
2179 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2180 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2181 /* return the id of this client */
2182 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2187 for (p = ioctl_tables; p->cmd; p++) {
2189 return p->func(client, arg);
2191 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n",
2192 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2197 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2199 struct snd_seq_client *client = file->private_data;
2201 snd_assert(client != NULL, return -ENXIO);
2203 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2206 #ifdef CONFIG_COMPAT
2207 #include "seq_compat.c"
2209 #define snd_seq_ioctl_compat NULL
2212 /* -------------------------------------------------------- */
2215 /* exported to kernel modules */
2216 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2217 const char *name_fmt, ...)
2219 struct snd_seq_client *client;
2222 snd_assert(! in_interrupt(), return -EBUSY);
2224 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2226 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2229 if (mutex_lock_interruptible(®ister_mutex))
2230 return -ERESTARTSYS;
2233 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2234 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2235 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2239 /* empty write queue as default */
2240 client = seq_create_client1(client_index, 0);
2241 if (client == NULL) {
2242 mutex_unlock(®ister_mutex);
2243 return -EBUSY; /* failure code */
2245 usage_alloc(&client_usage, 1);
2247 client->accept_input = 1;
2248 client->accept_output = 1;
2250 va_start(args, name_fmt);
2251 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2254 client->type = KERNEL_CLIENT;
2255 mutex_unlock(®ister_mutex);
2257 /* make others aware this new client */
2258 snd_seq_system_client_ev_client_start(client->number);
2260 /* return client number to caller */
2261 return client->number;
2264 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2266 /* exported to kernel modules */
2267 int snd_seq_delete_kernel_client(int client)
2269 struct snd_seq_client *ptr;
2271 snd_assert(! in_interrupt(), return -EBUSY);
2273 ptr = clientptr(client);
2277 seq_free_client(ptr);
2282 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2284 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2285 * and snd_seq_kernel_client_enqueue_blocking
2287 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2288 struct file *file, int blocking,
2289 int atomic, int hop)
2291 struct snd_seq_client *cptr;
2294 snd_assert(ev != NULL, return -EINVAL);
2296 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2297 return 0; /* ignore this */
2298 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2299 return -EINVAL; /* quoted events can't be enqueued */
2301 /* fill in client number */
2302 ev->source.client = client;
2304 if (check_event_type_and_length(ev))
2307 cptr = snd_seq_client_use_ptr(client);
2311 if (! cptr->accept_output)
2314 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2316 snd_seq_client_unlock(cptr);
2321 * exported, called by kernel clients to enqueue events (w/o blocking)
2323 * RETURN VALUE: zero if succeed, negative if error
2325 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2326 int atomic, int hop)
2328 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2331 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2334 * exported, called by kernel clients to enqueue events (with blocking)
2336 * RETURN VALUE: zero if succeed, negative if error
2338 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2340 int atomic, int hop)
2342 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2345 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2348 * exported, called by kernel clients to dispatch events directly to other
2349 * clients, bypassing the queues. Event time-stamp will be updated.
2351 * RETURN VALUE: negative = delivery failed,
2352 * zero, or positive: the number of delivered events
2354 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2355 int atomic, int hop)
2357 struct snd_seq_client *cptr;
2360 snd_assert(ev != NULL, return -EINVAL);
2362 /* fill in client number */
2363 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2364 ev->source.client = client;
2366 if (check_event_type_and_length(ev))
2369 cptr = snd_seq_client_use_ptr(client);
2373 if (!cptr->accept_output)
2376 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2378 snd_seq_client_unlock(cptr);
2382 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2385 * exported, called by kernel clients to perform same functions as with
2388 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2390 struct snd_seq_client *client;
2394 client = clientptr(clientid);
2397 fs = snd_enter_user();
2398 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg);
2403 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2405 /* exported (for OSS emulator) */
2406 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2408 struct snd_seq_client *client;
2410 client = clientptr(clientid);
2414 if (! snd_seq_write_pool_allocated(client))
2416 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2421 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2423 /*---------------------------------------------------------------------------*/
2425 #ifdef CONFIG_PROC_FS
2429 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2430 struct snd_seq_port_subs_info *group,
2431 int is_src, char *msg)
2433 struct list_head *p;
2434 struct snd_seq_subscribers *s;
2437 down_read(&group->list_mutex);
2438 if (list_empty(&group->list_head)) {
2439 up_read(&group->list_mutex);
2442 snd_iprintf(buffer, msg);
2443 list_for_each(p, &group->list_head) {
2445 s = list_entry(p, struct snd_seq_subscribers, src_list);
2447 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2449 snd_iprintf(buffer, ", ");
2450 snd_iprintf(buffer, "%d:%d",
2451 is_src ? s->info.dest.client : s->info.sender.client,
2452 is_src ? s->info.dest.port : s->info.sender.port);
2453 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2454 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2455 if (group->exclusive)
2456 snd_iprintf(buffer, "[ex]");
2458 up_read(&group->list_mutex);
2459 snd_iprintf(buffer, "\n");
2462 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2463 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2464 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2466 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2468 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2469 struct snd_seq_client *client)
2471 struct snd_seq_client_port *p;
2473 mutex_lock(&client->ports_mutex);
2474 list_for_each_entry(p, &client->ports_list_head, list) {
2475 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2476 p->addr.port, p->name,
2477 FLAG_PERM_RD(p->capability),
2478 FLAG_PERM_WR(p->capability),
2479 FLAG_PERM_EX(p->capability),
2480 FLAG_PERM_DUPLEX(p->capability));
2481 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2482 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2484 mutex_unlock(&client->ports_mutex);
2488 void snd_seq_info_pool(struct snd_info_buffer *buffer,
2489 struct snd_seq_pool *pool, char *space);
2491 /* exported to seq_info.c */
2492 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2493 struct snd_info_buffer *buffer)
2496 struct snd_seq_client *client;
2498 snd_iprintf(buffer, "Client info\n");
2499 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2500 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2501 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2502 snd_iprintf(buffer, "\n");
2504 /* list the client table */
2505 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2506 client = snd_seq_client_use_ptr(c);
2509 if (client->type == NO_CLIENT) {
2510 snd_seq_client_unlock(client);
2514 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2516 client->type == USER_CLIENT ? "User" : "Kernel");
2517 snd_seq_info_dump_ports(buffer, client);
2518 if (snd_seq_write_pool_allocated(client)) {
2519 snd_iprintf(buffer, " Output pool :\n");
2520 snd_seq_info_pool(buffer, client->pool, " ");
2522 if (client->type == USER_CLIENT && client->data.user.fifo &&
2523 client->data.user.fifo->pool) {
2524 snd_iprintf(buffer, " Input pool :\n");
2525 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2527 snd_seq_client_unlock(client);
2530 #endif /* CONFIG_PROC_FS */
2532 /*---------------------------------------------------------------------------*/
2539 static const struct file_operations snd_seq_f_ops =
2541 .owner = THIS_MODULE,
2542 .read = snd_seq_read,
2543 .write = snd_seq_write,
2544 .open = snd_seq_open,
2545 .release = snd_seq_release,
2546 .poll = snd_seq_poll,
2547 .unlocked_ioctl = snd_seq_ioctl,
2548 .compat_ioctl = snd_seq_ioctl_compat,
2552 * register sequencer device
2554 int __init snd_sequencer_device_init(void)
2558 if (mutex_lock_interruptible(®ister_mutex))
2559 return -ERESTARTSYS;
2561 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2562 &snd_seq_f_ops, NULL, "seq")) < 0) {
2563 mutex_unlock(®ister_mutex);
2567 mutex_unlock(®ister_mutex);
2575 * unregister sequencer device
2577 void __exit snd_sequencer_device_done(void)
2579 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);