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 <linux/init.h>
25 #include <linux/export.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <linux/kmod.h>
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);
90 static inline unsigned short snd_seq_file_flags(struct file *file)
92 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
94 return SNDRV_SEQ_LFLG_OUTPUT;
96 return SNDRV_SEQ_LFLG_INPUT;
98 return SNDRV_SEQ_LFLG_OPEN;
102 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
104 return snd_seq_total_cells(client->pool) > 0;
107 /* return pointer to client structure for specified id */
108 static struct snd_seq_client *clientptr(int clientid)
110 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
111 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
115 return clienttab[clientid];
118 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
121 struct snd_seq_client *client;
123 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
124 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
128 spin_lock_irqsave(&clients_lock, flags);
129 client = clientptr(clientid);
132 if (clienttablock[clientid]) {
133 spin_unlock_irqrestore(&clients_lock, flags);
136 spin_unlock_irqrestore(&clients_lock, flags);
137 #ifdef CONFIG_MODULES
138 if (!in_interrupt()) {
139 static DECLARE_BITMAP(client_requested, SNDRV_SEQ_GLOBAL_CLIENTS);
140 static DECLARE_BITMAP(card_requested, SNDRV_CARDS);
142 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
145 if (!test_and_set_bit(clientid, client_requested)) {
146 for (idx = 0; idx < 15; idx++) {
147 if (seq_client_load[idx] < 0)
149 if (seq_client_load[idx] == clientid) {
150 request_module("snd-seq-client-%i",
156 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
157 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
158 SNDRV_SEQ_CLIENTS_PER_CARD;
159 if (card < snd_ecards_limit) {
160 if (!test_and_set_bit(card, card_requested))
161 snd_request_card(card);
162 snd_seq_device_load_drivers();
165 spin_lock_irqsave(&clients_lock, flags);
166 client = clientptr(clientid);
169 spin_unlock_irqrestore(&clients_lock, flags);
175 snd_use_lock_use(&client->use_lock);
176 spin_unlock_irqrestore(&clients_lock, flags);
180 static void usage_alloc(struct snd_seq_usage *res, int num)
183 if (res->cur > res->peak)
184 res->peak = res->cur;
187 static void usage_free(struct snd_seq_usage *res, int num)
192 /* initialise data structures */
193 int __init client_init_data(void)
195 /* zap out the client table */
196 memset(&clienttablock, 0, sizeof(clienttablock));
197 memset(&clienttab, 0, sizeof(clienttab));
202 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
206 struct snd_seq_client *client;
208 /* init client data */
209 client = kzalloc(sizeof(*client), GFP_KERNEL);
212 client->pool = snd_seq_pool_new(poolsize);
213 if (client->pool == NULL) {
217 client->type = NO_CLIENT;
218 snd_use_lock_init(&client->use_lock);
219 rwlock_init(&client->ports_lock);
220 mutex_init(&client->ports_mutex);
221 INIT_LIST_HEAD(&client->ports_list_head);
222 mutex_init(&client->ioctl_mutex);
224 /* find free slot in the client table */
225 spin_lock_irqsave(&clients_lock, flags);
226 if (client_index < 0) {
227 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
228 c < SNDRV_SEQ_MAX_CLIENTS;
230 if (clienttab[c] || clienttablock[c])
232 clienttab[client->number = c] = client;
233 spin_unlock_irqrestore(&clients_lock, flags);
237 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
238 clienttab[client->number = client_index] = client;
239 spin_unlock_irqrestore(&clients_lock, flags);
243 spin_unlock_irqrestore(&clients_lock, flags);
244 snd_seq_pool_delete(&client->pool);
246 return NULL; /* no free slot found or busy, return failure code */
250 static int seq_free_client1(struct snd_seq_client *client)
256 spin_lock_irqsave(&clients_lock, flags);
257 clienttablock[client->number] = 1;
258 clienttab[client->number] = NULL;
259 spin_unlock_irqrestore(&clients_lock, flags);
260 snd_seq_delete_all_ports(client);
261 snd_seq_queue_client_leave(client->number);
262 snd_use_lock_sync(&client->use_lock);
263 snd_seq_queue_client_termination(client->number);
265 snd_seq_pool_delete(&client->pool);
266 spin_lock_irqsave(&clients_lock, flags);
267 clienttablock[client->number] = 0;
268 spin_unlock_irqrestore(&clients_lock, flags);
273 static void seq_free_client(struct snd_seq_client * client)
275 mutex_lock(®ister_mutex);
276 switch (client->type) {
278 pr_warn("ALSA: seq: Trying to free unused client %d\n",
283 seq_free_client1(client);
284 usage_free(&client_usage, 1);
288 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
289 client->number, client->type);
291 mutex_unlock(®ister_mutex);
293 snd_seq_system_client_ev_client_exit(client->number);
298 /* -------------------------------------------------------- */
300 /* create a user client */
301 static int snd_seq_open(struct inode *inode, struct file *file)
303 int c, mode; /* client id */
304 struct snd_seq_client *client;
305 struct snd_seq_user_client *user;
308 err = nonseekable_open(inode, file);
312 mutex_lock(®ister_mutex);
313 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
315 mutex_unlock(®ister_mutex);
316 return -ENOMEM; /* failure code */
319 mode = snd_seq_file_flags(file);
320 if (mode & SNDRV_SEQ_LFLG_INPUT)
321 client->accept_input = 1;
322 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
323 client->accept_output = 1;
325 user = &client->data.user;
327 user->fifo_pool_size = 0;
329 if (mode & SNDRV_SEQ_LFLG_INPUT) {
330 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
331 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
332 if (user->fifo == NULL) {
333 seq_free_client1(client);
335 mutex_unlock(®ister_mutex);
340 usage_alloc(&client_usage, 1);
341 client->type = USER_CLIENT;
342 mutex_unlock(®ister_mutex);
345 file->private_data = client;
347 /* fill client data */
349 sprintf(client->name, "Client-%d", c);
350 client->data.user.owner = get_pid(task_pid(current));
352 /* make others aware this new client */
353 snd_seq_system_client_ev_client_start(c);
358 /* delete a user client */
359 static int snd_seq_release(struct inode *inode, struct file *file)
361 struct snd_seq_client *client = file->private_data;
364 seq_free_client(client);
365 if (client->data.user.fifo)
366 snd_seq_fifo_delete(&client->data.user.fifo);
367 put_pid(client->data.user.owner);
375 /* handle client read() */
376 /* possible error values:
377 * -ENXIO invalid client or file open mode
378 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
379 * -EINVAL no enough user-space buffer to write the whole event
380 * -EFAULT seg. fault during copy to user space
382 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
385 struct snd_seq_client *client = file->private_data;
386 struct snd_seq_fifo *fifo;
389 struct snd_seq_event_cell *cell;
391 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
394 if (!access_ok(VERIFY_WRITE, buf, count))
397 /* check client structures are in place */
398 if (snd_BUG_ON(!client))
401 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
404 if (atomic_read(&fifo->overflow) > 0) {
405 /* buffer overflow is detected */
406 snd_seq_fifo_clear(fifo);
407 /* return error code */
413 snd_seq_fifo_lock(fifo);
415 /* while data available in queue */
416 while (count >= sizeof(struct snd_seq_event)) {
419 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
420 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
423 if (snd_seq_ev_is_variable(&cell->event)) {
424 struct snd_seq_event tmpev;
426 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
427 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
431 count -= sizeof(struct snd_seq_event);
432 buf += sizeof(struct snd_seq_event);
433 err = snd_seq_expand_var_event(&cell->event, count,
434 (char __force *)buf, 0,
435 sizeof(struct snd_seq_event));
442 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
446 count -= sizeof(struct snd_seq_event);
447 buf += sizeof(struct snd_seq_event);
449 snd_seq_cell_free(cell);
450 cell = NULL; /* to be sure */
451 result += sizeof(struct snd_seq_event);
456 snd_seq_fifo_cell_putback(fifo, cell);
457 if (err == -EAGAIN && result > 0)
460 snd_seq_fifo_unlock(fifo);
462 return (err < 0) ? err : result;
467 * check access permission to the port
469 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
471 if ((port->capability & flags) != flags)
477 * check if the destination client is available, and return the pointer
478 * if filter is non-zero, client filter bitmap is tested.
480 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
483 struct snd_seq_client *dest;
485 dest = snd_seq_client_use_ptr(event->dest.client);
488 if (! dest->accept_input)
490 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
491 ! test_bit(event->type, dest->event_filter))
493 if (filter && !(dest->filter & filter))
496 return dest; /* ok - accessible */
498 snd_seq_client_unlock(dest);
504 * Return the error event.
506 * If the receiver client is a user client, the original event is
507 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
508 * the original event is also variable length, the external data is
509 * copied after the event record.
510 * If the receiver client is a kernel client, the original event is
511 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
514 static int bounce_error_event(struct snd_seq_client *client,
515 struct snd_seq_event *event,
516 int err, int atomic, int hop)
518 struct snd_seq_event bounce_ev;
521 if (client == NULL ||
522 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
523 ! client->accept_input)
524 return 0; /* ignored */
526 /* set up quoted error */
527 memset(&bounce_ev, 0, sizeof(bounce_ev));
528 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
529 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
530 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
531 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
532 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
533 bounce_ev.dest.client = client->number;
534 bounce_ev.dest.port = event->source.port;
535 bounce_ev.data.quote.origin = event->dest;
536 bounce_ev.data.quote.event = event;
537 bounce_ev.data.quote.value = -err; /* use positive value */
538 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
540 client->event_lost++;
549 * rewrite the time-stamp of the event record with the curren time
550 * of the given queue.
551 * return non-zero if updated.
553 static int update_timestamp_of_queue(struct snd_seq_event *event,
554 int queue, int real_time)
556 struct snd_seq_queue *q;
561 event->queue = queue;
562 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
564 event->time.time = snd_seq_timer_get_cur_time(q->timer, true);
565 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
567 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
568 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
576 * deliver an event to the specified destination.
577 * if filter is non-zero, client filter bitmap is tested.
579 * RETURN VALUE: 0 : if succeeded
582 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
583 struct snd_seq_event *event,
584 int filter, int atomic, int hop)
586 struct snd_seq_client *dest = NULL;
587 struct snd_seq_client_port *dest_port = NULL;
588 int result = -ENOENT;
591 direct = snd_seq_ev_is_direct(event);
593 dest = get_event_dest_client(event, filter);
596 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
597 if (dest_port == NULL)
600 /* check permission */
601 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
606 if (dest_port->timestamping)
607 update_timestamp_of_queue(event, dest_port->time_queue,
608 dest_port->time_real);
610 switch (dest->type) {
612 if (dest->data.user.fifo)
613 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
617 if (dest_port->event_input == NULL)
619 result = dest_port->event_input(event, direct,
620 dest_port->private_data,
629 snd_seq_port_unlock(dest_port);
631 snd_seq_client_unlock(dest);
633 if (result < 0 && !direct) {
634 result = bounce_error_event(client, event, result, atomic, hop);
641 * send the event to all subscribers:
643 static int deliver_to_subscribers(struct snd_seq_client *client,
644 struct snd_seq_event *event,
647 struct snd_seq_subscribers *subs;
648 int err, result = 0, num_ev = 0;
649 struct snd_seq_event event_saved;
650 struct snd_seq_client_port *src_port;
651 struct snd_seq_port_subs_info *grp;
653 src_port = snd_seq_port_use_ptr(client, event->source.port);
654 if (src_port == NULL)
655 return -EINVAL; /* invalid source port */
656 /* save original event record */
657 event_saved = *event;
658 grp = &src_port->c_src;
662 read_lock(&grp->list_lock);
664 down_read_nested(&grp->list_mutex, hop);
665 list_for_each_entry(subs, &grp->list_head, src_list) {
666 /* both ports ready? */
667 if (atomic_read(&subs->ref_count) != 2)
669 event->dest = subs->info.dest;
670 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
671 /* convert time according to flag with subscription */
672 update_timestamp_of_queue(event, subs->info.queue,
673 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
674 err = snd_seq_deliver_single_event(client, event,
677 /* save first error that occurs and continue */
683 /* restore original event record */
684 *event = event_saved;
687 read_unlock(&grp->list_lock);
689 up_read(&grp->list_mutex);
690 *event = event_saved; /* restore */
691 snd_seq_port_unlock(src_port);
692 return (result < 0) ? result : num_ev;
696 #ifdef SUPPORT_BROADCAST
698 * broadcast to all ports:
700 static int port_broadcast_event(struct snd_seq_client *client,
701 struct snd_seq_event *event,
704 int num_ev = 0, err, result = 0;
705 struct snd_seq_client *dest_client;
706 struct snd_seq_client_port *port;
708 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
709 if (dest_client == NULL)
710 return 0; /* no matching destination */
712 read_lock(&dest_client->ports_lock);
713 list_for_each_entry(port, &dest_client->ports_list_head, list) {
714 event->dest.port = port->addr.port;
715 /* pass NULL as source client to avoid error bounce */
716 err = snd_seq_deliver_single_event(NULL, event,
717 SNDRV_SEQ_FILTER_BROADCAST,
720 /* save first error that occurs and continue */
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 (result < 0) ? result : 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, result = 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,
760 /* save first error that occurs and continue */
767 event->dest = addr; /* restore */
768 return (result < 0) ? result : num_ev;
772 /* multicast - not supported yet */
773 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
776 pr_debug("ALSA: seq: multicast not supported yet.\n");
777 return 0; /* ignored */
779 #endif /* SUPPORT_BROADCAST */
782 /* deliver an event to the destination port(s).
783 * if the event is to subscribers or broadcast, the event is dispatched
784 * to multiple targets.
786 * RETURN VALUE: n > 0 : the number of delivered events.
787 * n == 0 : the event was not passed to any client.
788 * n < 0 : error - event was not processed.
790 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
796 if (hop >= SNDRV_SEQ_MAX_HOPS) {
797 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
798 event->source.client, event->source.port,
799 event->dest.client, event->dest.port);
803 if (snd_seq_ev_is_variable(event) &&
804 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
807 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
808 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
809 result = deliver_to_subscribers(client, event, atomic, hop);
810 #ifdef SUPPORT_BROADCAST
811 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
812 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
813 result = broadcast_event(client, event, atomic, hop);
814 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
815 result = multicast_event(client, event, atomic, hop);
816 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
817 result = port_broadcast_event(client, event, atomic, hop);
820 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
826 * dispatch an event cell:
827 * This function is called only from queue check routines in timer
828 * interrupts or after enqueued.
829 * The event cell shall be released or re-queued in this function.
831 * RETURN VALUE: n > 0 : the number of delivered events.
832 * n == 0 : the event was not passed to any client.
833 * n < 0 : error - event was not processed.
835 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
837 struct snd_seq_client *client;
840 if (snd_BUG_ON(!cell))
843 client = snd_seq_client_use_ptr(cell->event.source.client);
844 if (client == NULL) {
845 snd_seq_cell_free(cell); /* release this cell */
849 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
851 * the event cell is re-used as a NOTE-OFF event and
854 struct snd_seq_event tmpev, *ev;
856 /* reserve this event to enqueue note-off later */
858 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
859 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
862 * This was originally a note event. We now re-use the
863 * cell for the note-off event.
867 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
868 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
870 /* add the duration time */
871 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
872 case SNDRV_SEQ_TIME_STAMP_TICK:
873 ev->time.tick += ev->data.note.duration;
875 case SNDRV_SEQ_TIME_STAMP_REAL:
876 /* unit for duration is ms */
877 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
878 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
879 ev->time.time.tv_nsec / 1000000000;
880 ev->time.time.tv_nsec %= 1000000000;
883 ev->data.note.velocity = ev->data.note.off_velocity;
885 /* Now queue this cell as the note off event */
886 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
887 snd_seq_cell_free(cell); /* release this cell */
891 * event cell is freed after processing the event
894 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
895 snd_seq_cell_free(cell);
898 snd_seq_client_unlock(client);
903 /* Allocate a cell from client pool and enqueue it to queue:
904 * if pool is empty and blocking is TRUE, sleep until a new cell is
907 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
908 struct snd_seq_event *event,
909 struct file *file, int blocking,
911 struct mutex *mutexp)
913 struct snd_seq_event_cell *cell;
916 /* special queue values - force direct passing */
917 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
918 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
919 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
921 #ifdef SUPPORT_BROADCAST
922 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
923 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
924 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
927 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
928 /* check presence of source port */
929 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
930 if (src_port == NULL)
932 snd_seq_port_unlock(src_port);
935 /* direct event processing without enqueued */
936 if (snd_seq_ev_is_direct(event)) {
937 if (event->type == SNDRV_SEQ_EVENT_NOTE)
938 return -EINVAL; /* this event must be enqueued! */
939 return snd_seq_deliver_event(client, event, atomic, hop);
942 /* Not direct, normal queuing */
943 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
944 return -EINVAL; /* invalid queue */
945 if (! snd_seq_write_pool_allocated(client))
946 return -ENXIO; /* queue is not allocated */
948 /* allocate an event cell */
949 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
954 /* we got a cell. enqueue it. */
955 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
956 snd_seq_cell_free(cell);
965 * check validity of event type and data length.
966 * return non-zero if invalid.
968 static int check_event_type_and_length(struct snd_seq_event *ev)
970 switch (snd_seq_ev_length_type(ev)) {
971 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
972 if (snd_seq_ev_is_variable_type(ev))
975 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
976 if (! snd_seq_ev_is_variable_type(ev) ||
977 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
980 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
981 if (! snd_seq_ev_is_direct(ev))
990 /* possible error values:
991 * -ENXIO invalid client or file open mode
992 * -ENOMEM malloc failed
993 * -EFAULT seg. fault during copy from user space
994 * -EINVAL invalid event
995 * -EAGAIN no space in output pool
996 * -EINTR interrupts while sleep
997 * -EMLINK too many hops
998 * others depends on return value from driver callback
1000 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1001 size_t count, loff_t *offset)
1003 struct snd_seq_client *client = file->private_data;
1004 int written = 0, len;
1006 struct snd_seq_event event;
1008 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1011 /* check client structures are in place */
1012 if (snd_BUG_ON(!client))
1015 if (!client->accept_output || client->pool == NULL)
1020 /* allocate the pool now if the pool is not allocated yet */
1021 mutex_lock(&client->ioctl_mutex);
1022 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1023 err = snd_seq_pool_init(client->pool);
1028 /* only process whole events */
1030 while (count >= sizeof(struct snd_seq_event)) {
1031 /* Read in the event header from the user */
1032 len = sizeof(event);
1033 if (copy_from_user(&event, buf, len)) {
1037 event.source.client = client->number; /* fill in client number */
1038 /* Check for extension data length */
1039 if (check_event_type_and_length(&event)) {
1044 /* check for special events */
1045 if (event.type == SNDRV_SEQ_EVENT_NONE)
1047 else if (snd_seq_ev_is_reserved(&event)) {
1052 if (snd_seq_ev_is_variable(&event)) {
1053 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1054 if ((size_t)(extlen + len) > count) {
1055 /* back out, will get an error this time or next */
1059 /* set user space pointer */
1060 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1061 event.data.ext.ptr = (char __force *)buf
1062 + sizeof(struct snd_seq_event);
1063 len += extlen; /* increment data length */
1065 #ifdef CONFIG_COMPAT
1066 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1067 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1068 event.data.ext.ptr = ptr;
1073 /* ok, enqueue it */
1074 err = snd_seq_client_enqueue_event(client, &event, file,
1075 !(file->f_flags & O_NONBLOCK),
1076 0, 0, &client->ioctl_mutex);
1082 /* Update pointers and counts */
1087 /* let's have a coffee break if too many events are queued */
1088 if (++handled >= 200) {
1089 mutex_unlock(&client->ioctl_mutex);
1095 mutex_unlock(&client->ioctl_mutex);
1096 return written ? written : err;
1103 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1105 struct snd_seq_client *client = file->private_data;
1108 /* check client structures are in place */
1109 if (snd_BUG_ON(!client))
1112 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1113 client->data.user.fifo) {
1115 /* check if data is available in the outqueue */
1116 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1117 mask |= EPOLLIN | EPOLLRDNORM;
1120 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1122 /* check if data is available in the pool */
1123 if (!snd_seq_write_pool_allocated(client) ||
1124 snd_seq_pool_poll_wait(client->pool, file, wait))
1125 mask |= EPOLLOUT | EPOLLWRNORM;
1132 /*-----------------------------------------------------*/
1134 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1136 int *pversion = arg;
1138 *pversion = SNDRV_SEQ_VERSION;
1142 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1144 int *client_id = arg;
1146 *client_id = client->number;
1150 /* SYSTEM_INFO ioctl() */
1151 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1153 struct snd_seq_system_info *info = arg;
1155 memset(info, 0, sizeof(*info));
1156 /* fill the info fields */
1157 info->queues = SNDRV_SEQ_MAX_QUEUES;
1158 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1159 info->ports = SNDRV_SEQ_MAX_PORTS;
1160 info->channels = 256; /* fixed limit */
1161 info->cur_clients = client_usage.cur;
1162 info->cur_queues = snd_seq_queue_get_cur_queues();
1168 /* RUNNING_MODE ioctl() */
1169 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1171 struct snd_seq_running_info *info = arg;
1172 struct snd_seq_client *cptr;
1175 /* requested client number */
1176 cptr = snd_seq_client_use_ptr(info->client);
1178 return -ENOENT; /* don't change !!! */
1180 #ifdef SNDRV_BIG_ENDIAN
1181 if (!info->big_endian) {
1186 if (info->big_endian) {
1192 if (info->cpu_mode > sizeof(long)) {
1196 cptr->convert32 = (info->cpu_mode < sizeof(long));
1198 snd_seq_client_unlock(cptr);
1202 /* CLIENT_INFO ioctl() */
1203 static void get_client_info(struct snd_seq_client *cptr,
1204 struct snd_seq_client_info *info)
1206 info->client = cptr->number;
1208 /* fill the info fields */
1209 info->type = cptr->type;
1210 strcpy(info->name, cptr->name);
1211 info->filter = cptr->filter;
1212 info->event_lost = cptr->event_lost;
1213 memcpy(info->event_filter, cptr->event_filter, 32);
1214 info->num_ports = cptr->num_ports;
1216 if (cptr->type == USER_CLIENT)
1217 info->pid = pid_vnr(cptr->data.user.owner);
1221 if (cptr->type == KERNEL_CLIENT)
1222 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1226 memset(info->reserved, 0, sizeof(info->reserved));
1229 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1232 struct snd_seq_client_info *client_info = arg;
1233 struct snd_seq_client *cptr;
1235 /* requested client number */
1236 cptr = snd_seq_client_use_ptr(client_info->client);
1238 return -ENOENT; /* don't change !!! */
1240 get_client_info(cptr, client_info);
1241 snd_seq_client_unlock(cptr);
1247 /* CLIENT_INFO ioctl() */
1248 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1251 struct snd_seq_client_info *client_info = arg;
1253 /* it is not allowed to set the info fields for an another client */
1254 if (client->number != client_info->client)
1256 /* also client type must be set now */
1257 if (client->type != client_info->type)
1260 /* fill the info fields */
1261 if (client_info->name[0])
1262 strscpy(client->name, client_info->name, sizeof(client->name));
1264 client->filter = client_info->filter;
1265 client->event_lost = client_info->event_lost;
1266 memcpy(client->event_filter, client_info->event_filter, 32);
1273 * CREATE PORT ioctl()
1275 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1277 struct snd_seq_port_info *info = arg;
1278 struct snd_seq_client_port *port;
1279 struct snd_seq_port_callback *callback;
1282 /* it is not allowed to create the port for an another client */
1283 if (info->addr.client != client->number)
1286 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1290 if (client->type == USER_CLIENT && info->kernel) {
1291 port_idx = port->addr.port;
1292 snd_seq_port_unlock(port);
1293 snd_seq_delete_port(client, port_idx);
1296 if (client->type == KERNEL_CLIENT) {
1297 if ((callback = info->kernel) != NULL) {
1298 if (callback->owner)
1299 port->owner = callback->owner;
1300 port->private_data = callback->private_data;
1301 port->private_free = callback->private_free;
1302 port->event_input = callback->event_input;
1303 port->c_src.open = callback->subscribe;
1304 port->c_src.close = callback->unsubscribe;
1305 port->c_dest.open = callback->use;
1306 port->c_dest.close = callback->unuse;
1310 info->addr = port->addr;
1312 snd_seq_set_port_info(port, info);
1313 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1314 snd_seq_port_unlock(port);
1320 * DELETE PORT ioctl()
1322 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1324 struct snd_seq_port_info *info = arg;
1327 /* it is not allowed to remove the port for an another client */
1328 if (info->addr.client != client->number)
1331 err = snd_seq_delete_port(client, info->addr.port);
1333 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1339 * GET_PORT_INFO ioctl() (on any client)
1341 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1343 struct snd_seq_port_info *info = arg;
1344 struct snd_seq_client *cptr;
1345 struct snd_seq_client_port *port;
1347 cptr = snd_seq_client_use_ptr(info->addr.client);
1351 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1353 snd_seq_client_unlock(cptr);
1354 return -ENOENT; /* don't change */
1358 snd_seq_get_port_info(port, info);
1359 snd_seq_port_unlock(port);
1360 snd_seq_client_unlock(cptr);
1367 * SET_PORT_INFO ioctl() (only ports on this/own client)
1369 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1371 struct snd_seq_port_info *info = arg;
1372 struct snd_seq_client_port *port;
1374 if (info->addr.client != client->number) /* only set our own ports ! */
1376 port = snd_seq_port_use_ptr(client, info->addr.port);
1378 snd_seq_set_port_info(port, info);
1379 snd_seq_port_unlock(port);
1386 * port subscription (connection)
1388 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1389 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1391 static int check_subscription_permission(struct snd_seq_client *client,
1392 struct snd_seq_client_port *sport,
1393 struct snd_seq_client_port *dport,
1394 struct snd_seq_port_subscribe *subs)
1396 if (client->number != subs->sender.client &&
1397 client->number != subs->dest.client) {
1398 /* connection by third client - check export permission */
1399 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1401 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1405 /* check read permission */
1406 /* if sender or receiver is the subscribing client itself,
1407 * no permission check is necessary
1409 if (client->number != subs->sender.client) {
1410 if (! check_port_perm(sport, PERM_RD))
1413 /* check write permission */
1414 if (client->number != subs->dest.client) {
1415 if (! check_port_perm(dport, PERM_WR))
1422 * send an subscription notify event to user client:
1423 * client must be user client.
1425 int snd_seq_client_notify_subscription(int client, int port,
1426 struct snd_seq_port_subscribe *info,
1429 struct snd_seq_event event;
1431 memset(&event, 0, sizeof(event));
1432 event.type = evtype;
1433 event.data.connect.dest = info->dest;
1434 event.data.connect.sender = info->sender;
1436 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1441 * add to port's subscription list IOCTL interface
1443 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1446 struct snd_seq_port_subscribe *subs = arg;
1447 int result = -EINVAL;
1448 struct snd_seq_client *receiver = NULL, *sender = NULL;
1449 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1451 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1453 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1455 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1457 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1460 result = check_subscription_permission(client, sport, dport, subs);
1465 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1466 if (! result) /* broadcast announce */
1467 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1468 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1471 snd_seq_port_unlock(sport);
1473 snd_seq_port_unlock(dport);
1475 snd_seq_client_unlock(sender);
1477 snd_seq_client_unlock(receiver);
1483 * remove from port's subscription list
1485 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1488 struct snd_seq_port_subscribe *subs = arg;
1489 int result = -ENXIO;
1490 struct snd_seq_client *receiver = NULL, *sender = NULL;
1491 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1493 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1495 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1497 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1499 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1502 result = check_subscription_permission(client, sport, dport, subs);
1506 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1507 if (! result) /* broadcast announce */
1508 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1509 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1512 snd_seq_port_unlock(sport);
1514 snd_seq_port_unlock(dport);
1516 snd_seq_client_unlock(sender);
1518 snd_seq_client_unlock(receiver);
1523 /* CREATE_QUEUE ioctl() */
1524 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1526 struct snd_seq_queue_info *info = arg;
1527 struct snd_seq_queue *q;
1529 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1533 info->queue = q->queue;
1534 info->locked = q->locked;
1535 info->owner = q->owner;
1537 /* set queue name */
1539 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1540 strscpy(q->name, info->name, sizeof(q->name));
1541 snd_use_lock_free(&q->use_lock);
1546 /* DELETE_QUEUE ioctl() */
1547 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1549 struct snd_seq_queue_info *info = arg;
1551 return snd_seq_queue_delete(client->number, info->queue);
1554 /* GET_QUEUE_INFO ioctl() */
1555 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1558 struct snd_seq_queue_info *info = arg;
1559 struct snd_seq_queue *q;
1561 q = queueptr(info->queue);
1565 memset(info, 0, sizeof(*info));
1566 info->queue = q->queue;
1567 info->owner = q->owner;
1568 info->locked = q->locked;
1569 strlcpy(info->name, q->name, sizeof(info->name));
1575 /* SET_QUEUE_INFO ioctl() */
1576 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1579 struct snd_seq_queue_info *info = arg;
1580 struct snd_seq_queue *q;
1582 if (info->owner != client->number)
1585 /* change owner/locked permission */
1586 if (snd_seq_queue_check_access(info->queue, client->number)) {
1587 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1590 snd_seq_queue_use(info->queue, client->number, 1);
1595 q = queueptr(info->queue);
1598 if (q->owner != client->number) {
1602 strscpy(q->name, info->name, sizeof(q->name));
1608 /* GET_NAMED_QUEUE ioctl() */
1609 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1612 struct snd_seq_queue_info *info = arg;
1613 struct snd_seq_queue *q;
1615 q = snd_seq_queue_find_name(info->name);
1618 info->queue = q->queue;
1619 info->owner = q->owner;
1620 info->locked = q->locked;
1626 /* GET_QUEUE_STATUS ioctl() */
1627 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1630 struct snd_seq_queue_status *status = arg;
1631 struct snd_seq_queue *queue;
1632 struct snd_seq_timer *tmr;
1634 queue = queueptr(status->queue);
1637 memset(status, 0, sizeof(*status));
1638 status->queue = queue->queue;
1641 status->events = queue->tickq->cells + queue->timeq->cells;
1643 status->time = snd_seq_timer_get_cur_time(tmr, true);
1644 status->tick = snd_seq_timer_get_cur_tick(tmr);
1646 status->running = tmr->running;
1648 status->flags = queue->flags;
1655 /* GET_QUEUE_TEMPO ioctl() */
1656 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1659 struct snd_seq_queue_tempo *tempo = arg;
1660 struct snd_seq_queue *queue;
1661 struct snd_seq_timer *tmr;
1663 queue = queueptr(tempo->queue);
1666 memset(tempo, 0, sizeof(*tempo));
1667 tempo->queue = queue->queue;
1671 tempo->tempo = tmr->tempo;
1672 tempo->ppq = tmr->ppq;
1673 tempo->skew_value = tmr->skew;
1674 tempo->skew_base = tmr->skew_base;
1681 /* SET_QUEUE_TEMPO ioctl() */
1682 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1684 if (!snd_seq_queue_check_access(tempo->queue, client))
1686 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1688 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1690 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1693 struct snd_seq_queue_tempo *tempo = arg;
1696 result = snd_seq_set_queue_tempo(client->number, tempo);
1697 return result < 0 ? result : 0;
1701 /* GET_QUEUE_TIMER ioctl() */
1702 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1705 struct snd_seq_queue_timer *timer = arg;
1706 struct snd_seq_queue *queue;
1707 struct snd_seq_timer *tmr;
1709 queue = queueptr(timer->queue);
1713 mutex_lock(&queue->timer_mutex);
1715 memset(timer, 0, sizeof(*timer));
1716 timer->queue = queue->queue;
1718 timer->type = tmr->type;
1719 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1720 timer->u.alsa.id = tmr->alsa_id;
1721 timer->u.alsa.resolution = tmr->preferred_resolution;
1723 mutex_unlock(&queue->timer_mutex);
1730 /* SET_QUEUE_TIMER ioctl() */
1731 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1734 struct snd_seq_queue_timer *timer = arg;
1737 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1740 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1741 struct snd_seq_queue *q;
1742 struct snd_seq_timer *tmr;
1744 q = queueptr(timer->queue);
1747 mutex_lock(&q->timer_mutex);
1749 snd_seq_queue_timer_close(timer->queue);
1750 tmr->type = timer->type;
1751 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1752 tmr->alsa_id = timer->u.alsa.id;
1753 tmr->preferred_resolution = timer->u.alsa.resolution;
1755 result = snd_seq_queue_timer_open(timer->queue);
1756 mutex_unlock(&q->timer_mutex);
1766 /* GET_QUEUE_CLIENT ioctl() */
1767 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1770 struct snd_seq_queue_client *info = arg;
1773 used = snd_seq_queue_is_used(info->queue, client->number);
1777 info->client = client->number;
1783 /* SET_QUEUE_CLIENT ioctl() */
1784 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1787 struct snd_seq_queue_client *info = arg;
1790 if (info->used >= 0) {
1791 err = snd_seq_queue_use(info->queue, client->number, info->used);
1796 return snd_seq_ioctl_get_queue_client(client, arg);
1800 /* GET_CLIENT_POOL ioctl() */
1801 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1804 struct snd_seq_client_pool *info = arg;
1805 struct snd_seq_client *cptr;
1807 cptr = snd_seq_client_use_ptr(info->client);
1810 memset(info, 0, sizeof(*info));
1811 info->client = cptr->number;
1812 info->output_pool = cptr->pool->size;
1813 info->output_room = cptr->pool->room;
1814 info->output_free = info->output_pool;
1815 info->output_free = snd_seq_unused_cells(cptr->pool);
1816 if (cptr->type == USER_CLIENT) {
1817 info->input_pool = cptr->data.user.fifo_pool_size;
1818 info->input_free = info->input_pool;
1819 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
1821 info->input_pool = 0;
1822 info->input_free = 0;
1824 snd_seq_client_unlock(cptr);
1829 /* SET_CLIENT_POOL ioctl() */
1830 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1833 struct snd_seq_client_pool *info = arg;
1836 if (client->number != info->client)
1837 return -EINVAL; /* can't change other clients */
1839 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1840 (! snd_seq_write_pool_allocated(client) ||
1841 info->output_pool != client->pool->size)) {
1842 if (snd_seq_write_pool_allocated(client)) {
1843 /* is the pool in use? */
1844 if (atomic_read(&client->pool->counter))
1846 /* remove all existing cells */
1847 snd_seq_pool_mark_closing(client->pool);
1848 snd_seq_pool_done(client->pool);
1850 client->pool->size = info->output_pool;
1851 rc = snd_seq_pool_init(client->pool);
1855 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1856 info->input_pool >= 1 &&
1857 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1858 info->input_pool != client->data.user.fifo_pool_size) {
1859 /* change pool size */
1860 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1863 client->data.user.fifo_pool_size = info->input_pool;
1865 if (info->output_room >= 1 &&
1866 info->output_room <= client->pool->size) {
1867 client->pool->room = info->output_room;
1870 return snd_seq_ioctl_get_client_pool(client, arg);
1874 /* REMOVE_EVENTS ioctl() */
1875 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1878 struct snd_seq_remove_events *info = arg;
1881 * Input mostly not implemented XXX.
1883 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1885 * No restrictions so for a user client we can clear
1888 if (client->type == USER_CLIENT && client->data.user.fifo)
1889 snd_seq_fifo_clear(client->data.user.fifo);
1892 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1893 snd_seq_queue_remove_cells(client->number, info);
1900 * get subscription info
1902 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1905 struct snd_seq_port_subscribe *subs = arg;
1907 struct snd_seq_client *sender = NULL;
1908 struct snd_seq_client_port *sport = NULL;
1911 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1913 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1915 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest,
1919 snd_seq_port_unlock(sport);
1921 snd_seq_client_unlock(sender);
1928 * get subscription info - check only its presence
1930 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1932 struct snd_seq_query_subs *subs = arg;
1933 int result = -ENXIO;
1934 struct snd_seq_client *cptr = NULL;
1935 struct snd_seq_client_port *port = NULL;
1936 struct snd_seq_port_subs_info *group;
1937 struct list_head *p;
1940 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1942 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1945 switch (subs->type) {
1946 case SNDRV_SEQ_QUERY_SUBS_READ:
1947 group = &port->c_src;
1949 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1950 group = &port->c_dest;
1956 down_read(&group->list_mutex);
1957 /* search for the subscriber */
1958 subs->num_subs = group->count;
1961 list_for_each(p, &group->list_head) {
1962 if (i++ == subs->index) {
1964 struct snd_seq_subscribers *s;
1965 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1966 s = list_entry(p, struct snd_seq_subscribers, src_list);
1967 subs->addr = s->info.dest;
1969 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1970 subs->addr = s->info.sender;
1972 subs->flags = s->info.flags;
1973 subs->queue = s->info.queue;
1978 up_read(&group->list_mutex);
1982 snd_seq_port_unlock(port);
1984 snd_seq_client_unlock(cptr);
1993 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1996 struct snd_seq_client_info *info = arg;
1997 struct snd_seq_client *cptr = NULL;
1999 /* search for next client */
2000 if (info->client < INT_MAX)
2002 if (info->client < 0)
2004 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2005 cptr = snd_seq_client_use_ptr(info->client);
2012 get_client_info(cptr, info);
2013 snd_seq_client_unlock(cptr);
2021 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2024 struct snd_seq_port_info *info = arg;
2025 struct snd_seq_client *cptr;
2026 struct snd_seq_client_port *port = NULL;
2028 cptr = snd_seq_client_use_ptr(info->addr.client);
2032 /* search for next port */
2034 port = snd_seq_port_query_nearest(cptr, info);
2036 snd_seq_client_unlock(cptr);
2041 info->addr = port->addr;
2042 snd_seq_get_port_info(port, info);
2043 snd_seq_port_unlock(port);
2044 snd_seq_client_unlock(cptr);
2049 /* -------------------------------------------------------- */
2051 static const struct ioctl_handler {
2053 int (*func)(struct snd_seq_client *client, void *arg);
2054 } ioctl_handlers[] = {
2055 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2056 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2057 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2058 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2059 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2060 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2061 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2062 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2063 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2064 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2065 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2066 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2067 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2068 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2069 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2070 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2071 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2072 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2073 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2074 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2075 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2076 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2077 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2078 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2079 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2080 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2081 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2082 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2083 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2084 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2085 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2089 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2092 struct snd_seq_client *client = file->private_data;
2093 /* To use kernel stack for ioctl data. */
2097 struct snd_seq_system_info system_info;
2098 struct snd_seq_running_info running_info;
2099 struct snd_seq_client_info client_info;
2100 struct snd_seq_port_info port_info;
2101 struct snd_seq_port_subscribe port_subscribe;
2102 struct snd_seq_queue_info queue_info;
2103 struct snd_seq_queue_status queue_status;
2104 struct snd_seq_queue_tempo tempo;
2105 struct snd_seq_queue_timer queue_timer;
2106 struct snd_seq_queue_client queue_client;
2107 struct snd_seq_client_pool client_pool;
2108 struct snd_seq_remove_events remove_events;
2109 struct snd_seq_query_subs query_subs;
2111 const struct ioctl_handler *handler;
2115 if (snd_BUG_ON(!client))
2118 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2119 if (handler->cmd == cmd)
2122 if (handler->cmd == 0)
2125 memset(&buf, 0, sizeof(buf));
2128 * All of ioctl commands for ALSA sequencer get an argument of size
2129 * within 13 bits. We can safely pick up the size from the command.
2131 size = _IOC_SIZE(handler->cmd);
2132 if (handler->cmd & IOC_IN) {
2133 if (copy_from_user(&buf, (const void __user *)arg, size))
2137 mutex_lock(&client->ioctl_mutex);
2138 err = handler->func(client, &buf);
2139 mutex_unlock(&client->ioctl_mutex);
2141 /* Some commands includes a bug in 'dir' field. */
2142 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2143 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2144 (handler->cmd & IOC_OUT))
2145 if (copy_to_user((void __user *)arg, &buf, size))
2152 #ifdef CONFIG_COMPAT
2153 #include "seq_compat.c"
2155 #define snd_seq_ioctl_compat NULL
2158 /* -------------------------------------------------------- */
2161 /* exported to kernel modules */
2162 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2163 const char *name_fmt, ...)
2165 struct snd_seq_client *client;
2168 if (snd_BUG_ON(in_interrupt()))
2171 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2173 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2176 mutex_lock(®ister_mutex);
2179 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2180 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2181 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2185 /* empty write queue as default */
2186 client = seq_create_client1(client_index, 0);
2187 if (client == NULL) {
2188 mutex_unlock(®ister_mutex);
2189 return -EBUSY; /* failure code */
2191 usage_alloc(&client_usage, 1);
2193 client->accept_input = 1;
2194 client->accept_output = 1;
2195 client->data.kernel.card = card;
2197 va_start(args, name_fmt);
2198 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2201 client->type = KERNEL_CLIENT;
2202 mutex_unlock(®ister_mutex);
2204 /* make others aware this new client */
2205 snd_seq_system_client_ev_client_start(client->number);
2207 /* return client number to caller */
2208 return client->number;
2210 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2212 /* exported to kernel modules */
2213 int snd_seq_delete_kernel_client(int client)
2215 struct snd_seq_client *ptr;
2217 if (snd_BUG_ON(in_interrupt()))
2220 ptr = clientptr(client);
2224 seq_free_client(ptr);
2228 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2230 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2231 * and snd_seq_kernel_client_enqueue_blocking
2233 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2234 struct file *file, int blocking,
2235 int atomic, int hop)
2237 struct snd_seq_client *cptr;
2240 if (snd_BUG_ON(!ev))
2243 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2244 return 0; /* ignore this */
2245 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2246 return -EINVAL; /* quoted events can't be enqueued */
2248 /* fill in client number */
2249 ev->source.client = client;
2251 if (check_event_type_and_length(ev))
2254 cptr = snd_seq_client_use_ptr(client);
2258 if (! cptr->accept_output)
2261 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2264 snd_seq_client_unlock(cptr);
2269 * exported, called by kernel clients to enqueue events (w/o blocking)
2271 * RETURN VALUE: zero if succeed, negative if error
2273 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2274 int atomic, int hop)
2276 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2278 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2281 * exported, called by kernel clients to enqueue events (with blocking)
2283 * RETURN VALUE: zero if succeed, negative if error
2285 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2287 int atomic, int hop)
2289 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2291 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2294 * exported, called by kernel clients to dispatch events directly to other
2295 * clients, bypassing the queues. Event time-stamp will be updated.
2297 * RETURN VALUE: negative = delivery failed,
2298 * zero, or positive: the number of delivered events
2300 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2301 int atomic, int hop)
2303 struct snd_seq_client *cptr;
2306 if (snd_BUG_ON(!ev))
2309 /* fill in client number */
2310 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2311 ev->source.client = client;
2313 if (check_event_type_and_length(ev))
2316 cptr = snd_seq_client_use_ptr(client);
2320 if (!cptr->accept_output)
2323 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2325 snd_seq_client_unlock(cptr);
2328 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2331 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2333 * @clientid: A numerical ID for a client.
2334 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2335 * @arg: A pointer to data in kernel space.
2337 * Against its name, both kernel/application client can be handled by this
2338 * kernel API. A pointer of 'arg' argument should be in kernel space.
2340 * Return: 0 at success. Negative error code at failure.
2342 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2344 const struct ioctl_handler *handler;
2345 struct snd_seq_client *client;
2347 client = clientptr(clientid);
2351 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2352 if (handler->cmd == cmd)
2353 return handler->func(client, arg);
2356 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2357 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2360 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2362 /* exported (for OSS emulator) */
2363 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2365 struct snd_seq_client *client;
2367 client = clientptr(clientid);
2371 if (! snd_seq_write_pool_allocated(client))
2373 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2377 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2379 /*---------------------------------------------------------------------------*/
2381 #ifdef CONFIG_SND_PROC_FS
2385 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2386 struct snd_seq_port_subs_info *group,
2387 int is_src, char *msg)
2389 struct list_head *p;
2390 struct snd_seq_subscribers *s;
2393 down_read(&group->list_mutex);
2394 if (list_empty(&group->list_head)) {
2395 up_read(&group->list_mutex);
2398 snd_iprintf(buffer, msg);
2399 list_for_each(p, &group->list_head) {
2401 s = list_entry(p, struct snd_seq_subscribers, src_list);
2403 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2405 snd_iprintf(buffer, ", ");
2406 snd_iprintf(buffer, "%d:%d",
2407 is_src ? s->info.dest.client : s->info.sender.client,
2408 is_src ? s->info.dest.port : s->info.sender.port);
2409 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2410 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2411 if (group->exclusive)
2412 snd_iprintf(buffer, "[ex]");
2414 up_read(&group->list_mutex);
2415 snd_iprintf(buffer, "\n");
2418 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2419 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2420 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2422 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2424 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2425 struct snd_seq_client *client)
2427 struct snd_seq_client_port *p;
2429 mutex_lock(&client->ports_mutex);
2430 list_for_each_entry(p, &client->ports_list_head, list) {
2431 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2432 p->addr.port, p->name,
2433 FLAG_PERM_RD(p->capability),
2434 FLAG_PERM_WR(p->capability),
2435 FLAG_PERM_EX(p->capability),
2436 FLAG_PERM_DUPLEX(p->capability));
2437 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2438 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2440 mutex_unlock(&client->ports_mutex);
2444 /* exported to seq_info.c */
2445 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2446 struct snd_info_buffer *buffer)
2449 struct snd_seq_client *client;
2451 snd_iprintf(buffer, "Client info\n");
2452 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2453 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2454 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2455 snd_iprintf(buffer, "\n");
2457 /* list the client table */
2458 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2459 client = snd_seq_client_use_ptr(c);
2462 if (client->type == NO_CLIENT) {
2463 snd_seq_client_unlock(client);
2467 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2469 client->type == USER_CLIENT ? "User" : "Kernel");
2470 snd_seq_info_dump_ports(buffer, client);
2471 if (snd_seq_write_pool_allocated(client)) {
2472 snd_iprintf(buffer, " Output pool :\n");
2473 snd_seq_info_pool(buffer, client->pool, " ");
2475 if (client->type == USER_CLIENT && client->data.user.fifo &&
2476 client->data.user.fifo->pool) {
2477 snd_iprintf(buffer, " Input pool :\n");
2478 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2480 snd_seq_client_unlock(client);
2483 #endif /* CONFIG_SND_PROC_FS */
2485 /*---------------------------------------------------------------------------*/
2492 static const struct file_operations snd_seq_f_ops =
2494 .owner = THIS_MODULE,
2495 .read = snd_seq_read,
2496 .write = snd_seq_write,
2497 .open = snd_seq_open,
2498 .release = snd_seq_release,
2499 .llseek = no_llseek,
2500 .poll = snd_seq_poll,
2501 .unlocked_ioctl = snd_seq_ioctl,
2502 .compat_ioctl = snd_seq_ioctl_compat,
2505 static struct device seq_dev;
2508 * register sequencer device
2510 int __init snd_sequencer_device_init(void)
2514 snd_device_initialize(&seq_dev, NULL);
2515 dev_set_name(&seq_dev, "seq");
2517 mutex_lock(®ister_mutex);
2518 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2519 &snd_seq_f_ops, NULL, &seq_dev);
2520 mutex_unlock(®ister_mutex);
2522 put_device(&seq_dev);
2532 * unregister sequencer device
2534 void snd_sequencer_device_done(void)
2536 snd_unregister_device(&seq_dev);
2537 put_device(&seq_dev);