2 * ALSA sequencer Client Manager
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 char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
140 static char card_requested[SNDRV_CARDS];
141 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
144 if (!client_requested[clientid]) {
145 client_requested[clientid] = 1;
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 (! card_requested[card]) {
161 card_requested[card] = 1;
162 snd_request_card(card);
164 snd_seq_device_load_drivers();
167 spin_lock_irqsave(&clients_lock, flags);
168 client = clientptr(clientid);
171 spin_unlock_irqrestore(&clients_lock, flags);
177 snd_use_lock_use(&client->use_lock);
178 spin_unlock_irqrestore(&clients_lock, flags);
182 static void usage_alloc(struct snd_seq_usage *res, int num)
185 if (res->cur > res->peak)
186 res->peak = res->cur;
189 static void usage_free(struct snd_seq_usage *res, int num)
194 /* initialise data structures */
195 int __init client_init_data(void)
197 /* zap out the client table */
198 memset(&clienttablock, 0, sizeof(clienttablock));
199 memset(&clienttab, 0, sizeof(clienttab));
204 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
208 struct snd_seq_client *client;
210 /* init client data */
211 client = kzalloc(sizeof(*client), GFP_KERNEL);
214 client->pool = snd_seq_pool_new(poolsize);
215 if (client->pool == NULL) {
219 client->type = NO_CLIENT;
220 snd_use_lock_init(&client->use_lock);
221 rwlock_init(&client->ports_lock);
222 mutex_init(&client->ports_mutex);
223 INIT_LIST_HEAD(&client->ports_list_head);
224 mutex_init(&client->ioctl_mutex);
226 /* find free slot in the client table */
227 spin_lock_irqsave(&clients_lock, flags);
228 if (client_index < 0) {
229 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
230 c < SNDRV_SEQ_MAX_CLIENTS;
232 if (clienttab[c] || clienttablock[c])
234 clienttab[client->number = c] = client;
235 spin_unlock_irqrestore(&clients_lock, flags);
239 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
240 clienttab[client->number = client_index] = client;
241 spin_unlock_irqrestore(&clients_lock, flags);
245 spin_unlock_irqrestore(&clients_lock, flags);
246 snd_seq_pool_delete(&client->pool);
248 return NULL; /* no free slot found or busy, return failure code */
252 static int seq_free_client1(struct snd_seq_client *client)
258 snd_seq_delete_all_ports(client);
259 snd_seq_queue_client_leave(client->number);
260 spin_lock_irqsave(&clients_lock, flags);
261 clienttablock[client->number] = 1;
262 clienttab[client->number] = NULL;
263 spin_unlock_irqrestore(&clients_lock, flags);
264 snd_use_lock_sync(&client->use_lock);
265 snd_seq_queue_client_termination(client->number);
267 snd_seq_pool_delete(&client->pool);
268 spin_lock_irqsave(&clients_lock, flags);
269 clienttablock[client->number] = 0;
270 spin_unlock_irqrestore(&clients_lock, flags);
275 static void seq_free_client(struct snd_seq_client * client)
277 mutex_lock(®ister_mutex);
278 switch (client->type) {
280 pr_warn("ALSA: seq: Trying to free unused client %d\n",
285 seq_free_client1(client);
286 usage_free(&client_usage, 1);
290 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
291 client->number, client->type);
293 mutex_unlock(®ister_mutex);
295 snd_seq_system_client_ev_client_exit(client->number);
300 /* -------------------------------------------------------- */
302 /* create a user client */
303 static int snd_seq_open(struct inode *inode, struct file *file)
305 int c, mode; /* client id */
306 struct snd_seq_client *client;
307 struct snd_seq_user_client *user;
310 err = nonseekable_open(inode, file);
314 if (mutex_lock_interruptible(®ister_mutex))
316 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
317 if (client == NULL) {
318 mutex_unlock(®ister_mutex);
319 return -ENOMEM; /* failure code */
322 mode = snd_seq_file_flags(file);
323 if (mode & SNDRV_SEQ_LFLG_INPUT)
324 client->accept_input = 1;
325 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
326 client->accept_output = 1;
328 user = &client->data.user;
330 user->fifo_pool_size = 0;
332 if (mode & SNDRV_SEQ_LFLG_INPUT) {
333 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
334 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
335 if (user->fifo == NULL) {
336 seq_free_client1(client);
338 mutex_unlock(®ister_mutex);
343 usage_alloc(&client_usage, 1);
344 client->type = USER_CLIENT;
345 mutex_unlock(®ister_mutex);
348 file->private_data = client;
350 /* fill client data */
352 sprintf(client->name, "Client-%d", c);
353 client->data.user.owner = get_pid(task_pid(current));
355 /* make others aware this new client */
356 snd_seq_system_client_ev_client_start(c);
361 /* delete a user client */
362 static int snd_seq_release(struct inode *inode, struct file *file)
364 struct snd_seq_client *client = file->private_data;
367 seq_free_client(client);
368 if (client->data.user.fifo)
369 snd_seq_fifo_delete(&client->data.user.fifo);
370 put_pid(client->data.user.owner);
378 /* handle client read() */
379 /* possible error values:
380 * -ENXIO invalid client or file open mode
381 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
382 * -EINVAL no enough user-space buffer to write the whole event
383 * -EFAULT seg. fault during copy to user space
385 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
388 struct snd_seq_client *client = file->private_data;
389 struct snd_seq_fifo *fifo;
392 struct snd_seq_event_cell *cell;
394 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
397 if (!access_ok(VERIFY_WRITE, buf, count))
400 /* check client structures are in place */
401 if (snd_BUG_ON(!client))
404 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
407 if (atomic_read(&fifo->overflow) > 0) {
408 /* buffer overflow is detected */
409 snd_seq_fifo_clear(fifo);
410 /* return error code */
416 snd_seq_fifo_lock(fifo);
418 /* while data available in queue */
419 while (count >= sizeof(struct snd_seq_event)) {
422 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
423 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
426 if (snd_seq_ev_is_variable(&cell->event)) {
427 struct snd_seq_event tmpev;
429 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
430 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
434 count -= sizeof(struct snd_seq_event);
435 buf += sizeof(struct snd_seq_event);
436 err = snd_seq_expand_var_event(&cell->event, count,
437 (char __force *)buf, 0,
438 sizeof(struct snd_seq_event));
445 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
449 count -= sizeof(struct snd_seq_event);
450 buf += sizeof(struct snd_seq_event);
452 snd_seq_cell_free(cell);
453 cell = NULL; /* to be sure */
454 result += sizeof(struct snd_seq_event);
459 snd_seq_fifo_cell_putback(fifo, cell);
460 if (err == -EAGAIN && result > 0)
463 snd_seq_fifo_unlock(fifo);
465 return (err < 0) ? err : result;
470 * check access permission to the port
472 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
474 if ((port->capability & flags) != flags)
480 * check if the destination client is available, and return the pointer
481 * if filter is non-zero, client filter bitmap is tested.
483 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
486 struct snd_seq_client *dest;
488 dest = snd_seq_client_use_ptr(event->dest.client);
491 if (! dest->accept_input)
493 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
494 ! test_bit(event->type, dest->event_filter))
496 if (filter && !(dest->filter & filter))
499 return dest; /* ok - accessible */
501 snd_seq_client_unlock(dest);
507 * Return the error event.
509 * If the receiver client is a user client, the original event is
510 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
511 * the original event is also variable length, the external data is
512 * copied after the event record.
513 * If the receiver client is a kernel client, the original event is
514 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
517 static int bounce_error_event(struct snd_seq_client *client,
518 struct snd_seq_event *event,
519 int err, int atomic, int hop)
521 struct snd_seq_event bounce_ev;
524 if (client == NULL ||
525 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
526 ! client->accept_input)
527 return 0; /* ignored */
529 /* set up quoted error */
530 memset(&bounce_ev, 0, sizeof(bounce_ev));
531 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
532 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
533 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
534 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
535 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
536 bounce_ev.dest.client = client->number;
537 bounce_ev.dest.port = event->source.port;
538 bounce_ev.data.quote.origin = event->dest;
539 bounce_ev.data.quote.event = event;
540 bounce_ev.data.quote.value = -err; /* use positive value */
541 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
543 client->event_lost++;
552 * rewrite the time-stamp of the event record with the curren time
553 * of the given queue.
554 * return non-zero if updated.
556 static int update_timestamp_of_queue(struct snd_seq_event *event,
557 int queue, int real_time)
559 struct snd_seq_queue *q;
564 event->queue = queue;
565 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
567 event->time.time = snd_seq_timer_get_cur_time(q->timer);
568 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
570 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
571 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
579 * deliver an event to the specified destination.
580 * if filter is non-zero, client filter bitmap is tested.
582 * RETURN VALUE: 0 : if succeeded
585 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
586 struct snd_seq_event *event,
587 int filter, int atomic, int hop)
589 struct snd_seq_client *dest = NULL;
590 struct snd_seq_client_port *dest_port = NULL;
591 int result = -ENOENT;
594 direct = snd_seq_ev_is_direct(event);
596 dest = get_event_dest_client(event, filter);
599 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
600 if (dest_port == NULL)
603 /* check permission */
604 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
609 if (dest_port->timestamping)
610 update_timestamp_of_queue(event, dest_port->time_queue,
611 dest_port->time_real);
613 switch (dest->type) {
615 if (dest->data.user.fifo)
616 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
620 if (dest_port->event_input == NULL)
622 result = dest_port->event_input(event, direct,
623 dest_port->private_data,
632 snd_seq_port_unlock(dest_port);
634 snd_seq_client_unlock(dest);
636 if (result < 0 && !direct) {
637 result = bounce_error_event(client, event, result, atomic, hop);
644 * send the event to all subscribers:
646 static int deliver_to_subscribers(struct snd_seq_client *client,
647 struct snd_seq_event *event,
650 struct snd_seq_subscribers *subs;
651 int err, result = 0, num_ev = 0;
652 struct snd_seq_event event_saved;
653 struct snd_seq_client_port *src_port;
654 struct snd_seq_port_subs_info *grp;
656 src_port = snd_seq_port_use_ptr(client, event->source.port);
657 if (src_port == NULL)
658 return -EINVAL; /* invalid source port */
659 /* save original event record */
660 event_saved = *event;
661 grp = &src_port->c_src;
665 read_lock(&grp->list_lock);
667 down_read_nested(&grp->list_mutex, hop);
668 list_for_each_entry(subs, &grp->list_head, src_list) {
669 /* both ports ready? */
670 if (atomic_read(&subs->ref_count) != 2)
672 event->dest = subs->info.dest;
673 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
674 /* convert time according to flag with subscription */
675 update_timestamp_of_queue(event, subs->info.queue,
676 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
677 err = snd_seq_deliver_single_event(client, event,
680 /* save first error that occurs and continue */
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 (result < 0) ? result : 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, result = 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,
723 /* save first error that occurs and continue */
730 read_unlock(&dest_client->ports_lock);
731 snd_seq_client_unlock(dest_client);
732 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
733 return (result < 0) ? result : num_ev;
737 * send the event to all clients:
738 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
740 static int broadcast_event(struct snd_seq_client *client,
741 struct snd_seq_event *event, int atomic, int hop)
743 int err, result = 0, num_ev = 0;
745 struct snd_seq_addr addr;
747 addr = event->dest; /* save */
749 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
750 /* don't send to itself */
751 if (dest == client->number)
753 event->dest.client = dest;
754 event->dest.port = addr.port;
755 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
756 err = port_broadcast_event(client, event, atomic, hop);
758 /* pass NULL as source client to avoid error bounce */
759 err = snd_seq_deliver_single_event(NULL, event,
760 SNDRV_SEQ_FILTER_BROADCAST,
763 /* save first error that occurs and continue */
770 event->dest = addr; /* restore */
771 return (result < 0) ? result : num_ev;
775 /* multicast - not supported yet */
776 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
779 pr_debug("ALSA: seq: multicast not supported yet.\n");
780 return 0; /* ignored */
782 #endif /* SUPPORT_BROADCAST */
785 /* deliver an event to the destination port(s).
786 * if the event is to subscribers or broadcast, the event is dispatched
787 * to multiple targets.
789 * RETURN VALUE: n > 0 : the number of delivered events.
790 * n == 0 : the event was not passed to any client.
791 * n < 0 : error - event was not processed.
793 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
799 if (hop >= SNDRV_SEQ_MAX_HOPS) {
800 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
801 event->source.client, event->source.port,
802 event->dest.client, event->dest.port);
806 if (snd_seq_ev_is_variable(event) &&
807 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
810 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
811 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
812 result = deliver_to_subscribers(client, event, atomic, hop);
813 #ifdef SUPPORT_BROADCAST
814 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
815 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
816 result = broadcast_event(client, event, atomic, hop);
817 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
818 result = multicast_event(client, event, atomic, hop);
819 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
820 result = port_broadcast_event(client, event, atomic, hop);
823 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
829 * dispatch an event cell:
830 * This function is called only from queue check routines in timer
831 * interrupts or after enqueued.
832 * The event cell shall be released or re-queued in this function.
834 * RETURN VALUE: n > 0 : the number of delivered events.
835 * n == 0 : the event was not passed to any client.
836 * n < 0 : error - event was not processed.
838 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
840 struct snd_seq_client *client;
843 if (snd_BUG_ON(!cell))
846 client = snd_seq_client_use_ptr(cell->event.source.client);
847 if (client == NULL) {
848 snd_seq_cell_free(cell); /* release this cell */
852 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
854 * the event cell is re-used as a NOTE-OFF event and
857 struct snd_seq_event tmpev, *ev;
859 /* reserve this event to enqueue note-off later */
861 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
862 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
865 * This was originally a note event. We now re-use the
866 * cell for the note-off event.
870 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
871 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
873 /* add the duration time */
874 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
875 case SNDRV_SEQ_TIME_STAMP_TICK:
876 ev->time.tick += ev->data.note.duration;
878 case SNDRV_SEQ_TIME_STAMP_REAL:
879 /* unit for duration is ms */
880 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
881 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
882 ev->time.time.tv_nsec / 1000000000;
883 ev->time.time.tv_nsec %= 1000000000;
886 ev->data.note.velocity = ev->data.note.off_velocity;
888 /* Now queue this cell as the note off event */
889 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
890 snd_seq_cell_free(cell); /* release this cell */
894 * event cell is freed after processing the event
897 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
898 snd_seq_cell_free(cell);
901 snd_seq_client_unlock(client);
906 /* Allocate a cell from client pool and enqueue it to queue:
907 * if pool is empty and blocking is TRUE, sleep until a new cell is
910 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
911 struct snd_seq_event *event,
912 struct file *file, int blocking,
915 struct snd_seq_event_cell *cell;
918 /* special queue values - force direct passing */
919 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
920 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
921 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
923 #ifdef SUPPORT_BROADCAST
924 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
925 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
926 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
929 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
930 /* check presence of source port */
931 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
932 if (src_port == NULL)
934 snd_seq_port_unlock(src_port);
937 /* direct event processing without enqueued */
938 if (snd_seq_ev_is_direct(event)) {
939 if (event->type == SNDRV_SEQ_EVENT_NOTE)
940 return -EINVAL; /* this event must be enqueued! */
941 return snd_seq_deliver_event(client, event, atomic, hop);
944 /* Not direct, normal queuing */
945 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
946 return -EINVAL; /* invalid queue */
947 if (! snd_seq_write_pool_allocated(client))
948 return -ENXIO; /* queue is not allocated */
950 /* allocate an event cell */
951 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
955 /* we got a cell. enqueue it. */
956 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
957 snd_seq_cell_free(cell);
966 * check validity of event type and data length.
967 * return non-zero if invalid.
969 static int check_event_type_and_length(struct snd_seq_event *ev)
971 switch (snd_seq_ev_length_type(ev)) {
972 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
973 if (snd_seq_ev_is_variable_type(ev))
976 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
977 if (! snd_seq_ev_is_variable_type(ev) ||
978 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
981 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
982 if (! snd_seq_ev_is_direct(ev))
991 /* possible error values:
992 * -ENXIO invalid client or file open mode
993 * -ENOMEM malloc failed
994 * -EFAULT seg. fault during copy from user space
995 * -EINVAL invalid event
996 * -EAGAIN no space in output pool
997 * -EINTR interrupts while sleep
998 * -EMLINK too many hops
999 * others depends on return value from driver callback
1001 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1002 size_t count, loff_t *offset)
1004 struct snd_seq_client *client = file->private_data;
1005 int written = 0, len;
1007 struct snd_seq_event event;
1009 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1012 /* check client structures are in place */
1013 if (snd_BUG_ON(!client))
1016 if (!client->accept_output || client->pool == NULL)
1019 /* allocate the pool now if the pool is not allocated yet */
1020 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1021 if (snd_seq_pool_init(client->pool) < 0)
1025 /* only process whole events */
1026 while (count >= sizeof(struct snd_seq_event)) {
1027 /* Read in the event header from the user */
1028 len = sizeof(event);
1029 if (copy_from_user(&event, buf, len)) {
1033 event.source.client = client->number; /* fill in client number */
1034 /* Check for extension data length */
1035 if (check_event_type_and_length(&event)) {
1040 /* check for special events */
1041 if (event.type == SNDRV_SEQ_EVENT_NONE)
1043 else if (snd_seq_ev_is_reserved(&event)) {
1048 if (snd_seq_ev_is_variable(&event)) {
1049 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1050 if ((size_t)(extlen + len) > count) {
1051 /* back out, will get an error this time or next */
1055 /* set user space pointer */
1056 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1057 event.data.ext.ptr = (char __force *)buf
1058 + sizeof(struct snd_seq_event);
1059 len += extlen; /* increment data length */
1061 #ifdef CONFIG_COMPAT
1062 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1063 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1064 event.data.ext.ptr = ptr;
1069 /* ok, enqueue it */
1070 err = snd_seq_client_enqueue_event(client, &event, file,
1071 !(file->f_flags & O_NONBLOCK),
1077 /* Update pointers and counts */
1083 return written ? written : err;
1090 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1092 struct snd_seq_client *client = file->private_data;
1095 /* check client structures are in place */
1096 if (snd_BUG_ON(!client))
1099 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1100 client->data.user.fifo) {
1102 /* check if data is available in the outqueue */
1103 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1104 mask |= EPOLLIN | EPOLLRDNORM;
1107 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1109 /* check if data is available in the pool */
1110 if (!snd_seq_write_pool_allocated(client) ||
1111 snd_seq_pool_poll_wait(client->pool, file, wait))
1112 mask |= EPOLLOUT | EPOLLWRNORM;
1119 /*-----------------------------------------------------*/
1121 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1123 int *pversion = arg;
1125 *pversion = SNDRV_SEQ_VERSION;
1129 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1131 int *client_id = arg;
1133 *client_id = client->number;
1137 /* SYSTEM_INFO ioctl() */
1138 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1140 struct snd_seq_system_info *info = arg;
1142 memset(info, 0, sizeof(*info));
1143 /* fill the info fields */
1144 info->queues = SNDRV_SEQ_MAX_QUEUES;
1145 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1146 info->ports = SNDRV_SEQ_MAX_PORTS;
1147 info->channels = 256; /* fixed limit */
1148 info->cur_clients = client_usage.cur;
1149 info->cur_queues = snd_seq_queue_get_cur_queues();
1155 /* RUNNING_MODE ioctl() */
1156 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1158 struct snd_seq_running_info *info = arg;
1159 struct snd_seq_client *cptr;
1162 /* requested client number */
1163 cptr = snd_seq_client_use_ptr(info->client);
1165 return -ENOENT; /* don't change !!! */
1167 #ifdef SNDRV_BIG_ENDIAN
1168 if (!info->big_endian) {
1173 if (info->big_endian) {
1179 if (info->cpu_mode > sizeof(long)) {
1183 cptr->convert32 = (info->cpu_mode < sizeof(long));
1185 snd_seq_client_unlock(cptr);
1189 /* CLIENT_INFO ioctl() */
1190 static void get_client_info(struct snd_seq_client *cptr,
1191 struct snd_seq_client_info *info)
1193 info->client = cptr->number;
1195 /* fill the info fields */
1196 info->type = cptr->type;
1197 strcpy(info->name, cptr->name);
1198 info->filter = cptr->filter;
1199 info->event_lost = cptr->event_lost;
1200 memcpy(info->event_filter, cptr->event_filter, 32);
1201 info->num_ports = cptr->num_ports;
1203 if (cptr->type == USER_CLIENT)
1204 info->pid = pid_vnr(cptr->data.user.owner);
1208 if (cptr->type == KERNEL_CLIENT)
1209 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1213 memset(info->reserved, 0, sizeof(info->reserved));
1216 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1219 struct snd_seq_client_info *client_info = arg;
1220 struct snd_seq_client *cptr;
1222 /* requested client number */
1223 cptr = snd_seq_client_use_ptr(client_info->client);
1225 return -ENOENT; /* don't change !!! */
1227 get_client_info(cptr, client_info);
1228 snd_seq_client_unlock(cptr);
1234 /* CLIENT_INFO ioctl() */
1235 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1238 struct snd_seq_client_info *client_info = arg;
1240 /* it is not allowed to set the info fields for an another client */
1241 if (client->number != client_info->client)
1243 /* also client type must be set now */
1244 if (client->type != client_info->type)
1247 /* fill the info fields */
1248 if (client_info->name[0])
1249 strlcpy(client->name, client_info->name, sizeof(client->name));
1251 client->filter = client_info->filter;
1252 client->event_lost = client_info->event_lost;
1253 memcpy(client->event_filter, client_info->event_filter, 32);
1260 * CREATE PORT ioctl()
1262 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1264 struct snd_seq_port_info *info = arg;
1265 struct snd_seq_client_port *port;
1266 struct snd_seq_port_callback *callback;
1269 /* it is not allowed to create the port for an another client */
1270 if (info->addr.client != client->number)
1273 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1277 if (client->type == USER_CLIENT && info->kernel) {
1278 port_idx = port->addr.port;
1279 snd_seq_port_unlock(port);
1280 snd_seq_delete_port(client, port_idx);
1283 if (client->type == KERNEL_CLIENT) {
1284 if ((callback = info->kernel) != NULL) {
1285 if (callback->owner)
1286 port->owner = callback->owner;
1287 port->private_data = callback->private_data;
1288 port->private_free = callback->private_free;
1289 port->event_input = callback->event_input;
1290 port->c_src.open = callback->subscribe;
1291 port->c_src.close = callback->unsubscribe;
1292 port->c_dest.open = callback->use;
1293 port->c_dest.close = callback->unuse;
1297 info->addr = port->addr;
1299 snd_seq_set_port_info(port, info);
1300 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1301 snd_seq_port_unlock(port);
1307 * DELETE PORT ioctl()
1309 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1311 struct snd_seq_port_info *info = arg;
1314 /* it is not allowed to remove the port for an another client */
1315 if (info->addr.client != client->number)
1318 err = snd_seq_delete_port(client, info->addr.port);
1320 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1326 * GET_PORT_INFO ioctl() (on any client)
1328 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1330 struct snd_seq_port_info *info = arg;
1331 struct snd_seq_client *cptr;
1332 struct snd_seq_client_port *port;
1334 cptr = snd_seq_client_use_ptr(info->addr.client);
1338 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1340 snd_seq_client_unlock(cptr);
1341 return -ENOENT; /* don't change */
1345 snd_seq_get_port_info(port, info);
1346 snd_seq_port_unlock(port);
1347 snd_seq_client_unlock(cptr);
1354 * SET_PORT_INFO ioctl() (only ports on this/own client)
1356 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1358 struct snd_seq_port_info *info = arg;
1359 struct snd_seq_client_port *port;
1361 if (info->addr.client != client->number) /* only set our own ports ! */
1363 port = snd_seq_port_use_ptr(client, info->addr.port);
1365 snd_seq_set_port_info(port, info);
1366 snd_seq_port_unlock(port);
1373 * port subscription (connection)
1375 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1376 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1378 static int check_subscription_permission(struct snd_seq_client *client,
1379 struct snd_seq_client_port *sport,
1380 struct snd_seq_client_port *dport,
1381 struct snd_seq_port_subscribe *subs)
1383 if (client->number != subs->sender.client &&
1384 client->number != subs->dest.client) {
1385 /* connection by third client - check export permission */
1386 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1388 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1392 /* check read permission */
1393 /* if sender or receiver is the subscribing client itself,
1394 * no permission check is necessary
1396 if (client->number != subs->sender.client) {
1397 if (! check_port_perm(sport, PERM_RD))
1400 /* check write permission */
1401 if (client->number != subs->dest.client) {
1402 if (! check_port_perm(dport, PERM_WR))
1409 * send an subscription notify event to user client:
1410 * client must be user client.
1412 int snd_seq_client_notify_subscription(int client, int port,
1413 struct snd_seq_port_subscribe *info,
1416 struct snd_seq_event event;
1418 memset(&event, 0, sizeof(event));
1419 event.type = evtype;
1420 event.data.connect.dest = info->dest;
1421 event.data.connect.sender = info->sender;
1423 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1428 * add to port's subscription list IOCTL interface
1430 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1433 struct snd_seq_port_subscribe *subs = arg;
1434 int result = -EINVAL;
1435 struct snd_seq_client *receiver = NULL, *sender = NULL;
1436 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1438 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1440 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1442 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1444 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1447 result = check_subscription_permission(client, sport, dport, subs);
1452 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1453 if (! result) /* broadcast announce */
1454 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1455 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1458 snd_seq_port_unlock(sport);
1460 snd_seq_port_unlock(dport);
1462 snd_seq_client_unlock(sender);
1464 snd_seq_client_unlock(receiver);
1470 * remove from port's subscription list
1472 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1475 struct snd_seq_port_subscribe *subs = arg;
1476 int result = -ENXIO;
1477 struct snd_seq_client *receiver = NULL, *sender = NULL;
1478 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1480 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1482 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1484 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1486 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1489 result = check_subscription_permission(client, sport, dport, subs);
1493 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1494 if (! result) /* broadcast announce */
1495 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1496 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1499 snd_seq_port_unlock(sport);
1501 snd_seq_port_unlock(dport);
1503 snd_seq_client_unlock(sender);
1505 snd_seq_client_unlock(receiver);
1510 /* CREATE_QUEUE ioctl() */
1511 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1513 struct snd_seq_queue_info *info = arg;
1514 struct snd_seq_queue *q;
1516 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1520 info->queue = q->queue;
1521 info->locked = q->locked;
1522 info->owner = q->owner;
1524 /* set queue name */
1526 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1527 strlcpy(q->name, info->name, sizeof(q->name));
1528 snd_use_lock_free(&q->use_lock);
1533 /* DELETE_QUEUE ioctl() */
1534 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1536 struct snd_seq_queue_info *info = arg;
1538 return snd_seq_queue_delete(client->number, info->queue);
1541 /* GET_QUEUE_INFO ioctl() */
1542 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1545 struct snd_seq_queue_info *info = arg;
1546 struct snd_seq_queue *q;
1548 q = queueptr(info->queue);
1552 memset(info, 0, sizeof(*info));
1553 info->queue = q->queue;
1554 info->owner = q->owner;
1555 info->locked = q->locked;
1556 strlcpy(info->name, q->name, sizeof(info->name));
1562 /* SET_QUEUE_INFO ioctl() */
1563 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1566 struct snd_seq_queue_info *info = arg;
1567 struct snd_seq_queue *q;
1569 if (info->owner != client->number)
1572 /* change owner/locked permission */
1573 if (snd_seq_queue_check_access(info->queue, client->number)) {
1574 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1577 snd_seq_queue_use(info->queue, client->number, 1);
1582 q = queueptr(info->queue);
1585 if (q->owner != client->number) {
1589 strlcpy(q->name, info->name, sizeof(q->name));
1595 /* GET_NAMED_QUEUE ioctl() */
1596 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1599 struct snd_seq_queue_info *info = arg;
1600 struct snd_seq_queue *q;
1602 q = snd_seq_queue_find_name(info->name);
1605 info->queue = q->queue;
1606 info->owner = q->owner;
1607 info->locked = q->locked;
1613 /* GET_QUEUE_STATUS ioctl() */
1614 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1617 struct snd_seq_queue_status *status = arg;
1618 struct snd_seq_queue *queue;
1619 struct snd_seq_timer *tmr;
1621 queue = queueptr(status->queue);
1624 memset(status, 0, sizeof(*status));
1625 status->queue = queue->queue;
1628 status->events = queue->tickq->cells + queue->timeq->cells;
1630 status->time = snd_seq_timer_get_cur_time(tmr);
1631 status->tick = snd_seq_timer_get_cur_tick(tmr);
1633 status->running = tmr->running;
1635 status->flags = queue->flags;
1642 /* GET_QUEUE_TEMPO ioctl() */
1643 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1646 struct snd_seq_queue_tempo *tempo = arg;
1647 struct snd_seq_queue *queue;
1648 struct snd_seq_timer *tmr;
1650 queue = queueptr(tempo->queue);
1653 memset(tempo, 0, sizeof(*tempo));
1654 tempo->queue = queue->queue;
1658 tempo->tempo = tmr->tempo;
1659 tempo->ppq = tmr->ppq;
1660 tempo->skew_value = tmr->skew;
1661 tempo->skew_base = tmr->skew_base;
1668 /* SET_QUEUE_TEMPO ioctl() */
1669 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1671 if (!snd_seq_queue_check_access(tempo->queue, client))
1673 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1675 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1677 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1680 struct snd_seq_queue_tempo *tempo = arg;
1683 result = snd_seq_set_queue_tempo(client->number, tempo);
1684 return result < 0 ? result : 0;
1688 /* GET_QUEUE_TIMER ioctl() */
1689 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1692 struct snd_seq_queue_timer *timer = arg;
1693 struct snd_seq_queue *queue;
1694 struct snd_seq_timer *tmr;
1696 queue = queueptr(timer->queue);
1700 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1702 return -ERESTARTSYS;
1705 memset(timer, 0, sizeof(*timer));
1706 timer->queue = queue->queue;
1708 timer->type = tmr->type;
1709 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1710 timer->u.alsa.id = tmr->alsa_id;
1711 timer->u.alsa.resolution = tmr->preferred_resolution;
1713 mutex_unlock(&queue->timer_mutex);
1720 /* SET_QUEUE_TIMER ioctl() */
1721 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1724 struct snd_seq_queue_timer *timer = arg;
1727 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1730 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1731 struct snd_seq_queue *q;
1732 struct snd_seq_timer *tmr;
1734 q = queueptr(timer->queue);
1737 if (mutex_lock_interruptible(&q->timer_mutex)) {
1739 return -ERESTARTSYS;
1742 snd_seq_queue_timer_close(timer->queue);
1743 tmr->type = timer->type;
1744 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1745 tmr->alsa_id = timer->u.alsa.id;
1746 tmr->preferred_resolution = timer->u.alsa.resolution;
1748 result = snd_seq_queue_timer_open(timer->queue);
1749 mutex_unlock(&q->timer_mutex);
1759 /* GET_QUEUE_CLIENT ioctl() */
1760 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1763 struct snd_seq_queue_client *info = arg;
1766 used = snd_seq_queue_is_used(info->queue, client->number);
1770 info->client = client->number;
1776 /* SET_QUEUE_CLIENT ioctl() */
1777 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1780 struct snd_seq_queue_client *info = arg;
1783 if (info->used >= 0) {
1784 err = snd_seq_queue_use(info->queue, client->number, info->used);
1789 return snd_seq_ioctl_get_queue_client(client, arg);
1793 /* GET_CLIENT_POOL ioctl() */
1794 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1797 struct snd_seq_client_pool *info = arg;
1798 struct snd_seq_client *cptr;
1800 cptr = snd_seq_client_use_ptr(info->client);
1803 memset(info, 0, sizeof(*info));
1804 info->client = cptr->number;
1805 info->output_pool = cptr->pool->size;
1806 info->output_room = cptr->pool->room;
1807 info->output_free = info->output_pool;
1808 info->output_free = snd_seq_unused_cells(cptr->pool);
1809 if (cptr->type == USER_CLIENT) {
1810 info->input_pool = cptr->data.user.fifo_pool_size;
1811 info->input_free = info->input_pool;
1812 if (cptr->data.user.fifo)
1813 info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1815 info->input_pool = 0;
1816 info->input_free = 0;
1818 snd_seq_client_unlock(cptr);
1823 /* SET_CLIENT_POOL ioctl() */
1824 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1827 struct snd_seq_client_pool *info = arg;
1830 if (client->number != info->client)
1831 return -EINVAL; /* can't change other clients */
1833 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1834 (! snd_seq_write_pool_allocated(client) ||
1835 info->output_pool != client->pool->size)) {
1836 if (snd_seq_write_pool_allocated(client)) {
1837 /* remove all existing cells */
1838 snd_seq_pool_mark_closing(client->pool);
1839 snd_seq_queue_client_leave_cells(client->number);
1840 snd_seq_pool_done(client->pool);
1842 client->pool->size = info->output_pool;
1843 rc = snd_seq_pool_init(client->pool);
1847 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1848 info->input_pool >= 1 &&
1849 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1850 info->input_pool != client->data.user.fifo_pool_size) {
1851 /* change pool size */
1852 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1855 client->data.user.fifo_pool_size = info->input_pool;
1857 if (info->output_room >= 1 &&
1858 info->output_room <= client->pool->size) {
1859 client->pool->room = info->output_room;
1862 return snd_seq_ioctl_get_client_pool(client, arg);
1866 /* REMOVE_EVENTS ioctl() */
1867 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1870 struct snd_seq_remove_events *info = arg;
1873 * Input mostly not implemented XXX.
1875 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1877 * No restrictions so for a user client we can clear
1880 if (client->type == USER_CLIENT && client->data.user.fifo)
1881 snd_seq_fifo_clear(client->data.user.fifo);
1884 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1885 snd_seq_queue_remove_cells(client->number, info);
1892 * get subscription info
1894 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1897 struct snd_seq_port_subscribe *subs = arg;
1899 struct snd_seq_client *sender = NULL;
1900 struct snd_seq_client_port *sport = NULL;
1901 struct snd_seq_subscribers *p;
1904 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1906 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1908 p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1917 snd_seq_port_unlock(sport);
1919 snd_seq_client_unlock(sender);
1926 * get subscription info - check only its presence
1928 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1930 struct snd_seq_query_subs *subs = arg;
1931 int result = -ENXIO;
1932 struct snd_seq_client *cptr = NULL;
1933 struct snd_seq_client_port *port = NULL;
1934 struct snd_seq_port_subs_info *group;
1935 struct list_head *p;
1938 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1940 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1943 switch (subs->type) {
1944 case SNDRV_SEQ_QUERY_SUBS_READ:
1945 group = &port->c_src;
1947 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1948 group = &port->c_dest;
1954 down_read(&group->list_mutex);
1955 /* search for the subscriber */
1956 subs->num_subs = group->count;
1959 list_for_each(p, &group->list_head) {
1960 if (i++ == subs->index) {
1962 struct snd_seq_subscribers *s;
1963 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1964 s = list_entry(p, struct snd_seq_subscribers, src_list);
1965 subs->addr = s->info.dest;
1967 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1968 subs->addr = s->info.sender;
1970 subs->flags = s->info.flags;
1971 subs->queue = s->info.queue;
1976 up_read(&group->list_mutex);
1980 snd_seq_port_unlock(port);
1982 snd_seq_client_unlock(cptr);
1991 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1994 struct snd_seq_client_info *info = arg;
1995 struct snd_seq_client *cptr = NULL;
1997 /* search for next client */
1999 if (info->client < 0)
2001 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2002 cptr = snd_seq_client_use_ptr(info->client);
2009 get_client_info(cptr, info);
2010 snd_seq_client_unlock(cptr);
2018 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2021 struct snd_seq_port_info *info = arg;
2022 struct snd_seq_client *cptr;
2023 struct snd_seq_client_port *port = NULL;
2025 cptr = snd_seq_client_use_ptr(info->addr.client);
2029 /* search for next port */
2031 port = snd_seq_port_query_nearest(cptr, info);
2033 snd_seq_client_unlock(cptr);
2038 info->addr = port->addr;
2039 snd_seq_get_port_info(port, info);
2040 snd_seq_port_unlock(port);
2041 snd_seq_client_unlock(cptr);
2046 /* -------------------------------------------------------- */
2048 static const struct ioctl_handler {
2050 int (*func)(struct snd_seq_client *client, void *arg);
2051 } ioctl_handlers[] = {
2052 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2053 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2054 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2055 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2056 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2057 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2058 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2059 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2060 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2061 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2062 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2063 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2064 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2065 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2066 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2067 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2068 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2069 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2070 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2071 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2072 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2073 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2074 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2075 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2076 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2077 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2078 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2079 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2080 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2081 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2082 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2086 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2089 struct snd_seq_client *client = file->private_data;
2090 /* To use kernel stack for ioctl data. */
2094 struct snd_seq_system_info system_info;
2095 struct snd_seq_running_info running_info;
2096 struct snd_seq_client_info client_info;
2097 struct snd_seq_port_info port_info;
2098 struct snd_seq_port_subscribe port_subscribe;
2099 struct snd_seq_queue_info queue_info;
2100 struct snd_seq_queue_status queue_status;
2101 struct snd_seq_queue_tempo tempo;
2102 struct snd_seq_queue_timer queue_timer;
2103 struct snd_seq_queue_client queue_client;
2104 struct snd_seq_client_pool client_pool;
2105 struct snd_seq_remove_events remove_events;
2106 struct snd_seq_query_subs query_subs;
2108 const struct ioctl_handler *handler;
2112 if (snd_BUG_ON(!client))
2115 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2116 if (handler->cmd == cmd)
2119 if (handler->cmd == 0)
2122 memset(&buf, 0, sizeof(buf));
2125 * All of ioctl commands for ALSA sequencer get an argument of size
2126 * within 13 bits. We can safely pick up the size from the command.
2128 size = _IOC_SIZE(handler->cmd);
2129 if (handler->cmd & IOC_IN) {
2130 if (copy_from_user(&buf, (const void __user *)arg, size))
2134 mutex_lock(&client->ioctl_mutex);
2135 err = handler->func(client, &buf);
2136 mutex_unlock(&client->ioctl_mutex);
2138 /* Some commands includes a bug in 'dir' field. */
2139 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2140 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2141 (handler->cmd & IOC_OUT))
2142 if (copy_to_user((void __user *)arg, &buf, size))
2149 #ifdef CONFIG_COMPAT
2150 #include "seq_compat.c"
2152 #define snd_seq_ioctl_compat NULL
2155 /* -------------------------------------------------------- */
2158 /* exported to kernel modules */
2159 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2160 const char *name_fmt, ...)
2162 struct snd_seq_client *client;
2165 if (snd_BUG_ON(in_interrupt()))
2168 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2170 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2173 if (mutex_lock_interruptible(®ister_mutex))
2174 return -ERESTARTSYS;
2177 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2178 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2179 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2183 /* empty write queue as default */
2184 client = seq_create_client1(client_index, 0);
2185 if (client == NULL) {
2186 mutex_unlock(®ister_mutex);
2187 return -EBUSY; /* failure code */
2189 usage_alloc(&client_usage, 1);
2191 client->accept_input = 1;
2192 client->accept_output = 1;
2193 client->data.kernel.card = card;
2195 va_start(args, name_fmt);
2196 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2199 client->type = KERNEL_CLIENT;
2200 mutex_unlock(®ister_mutex);
2202 /* make others aware this new client */
2203 snd_seq_system_client_ev_client_start(client->number);
2205 /* return client number to caller */
2206 return client->number;
2208 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2210 /* exported to kernel modules */
2211 int snd_seq_delete_kernel_client(int client)
2213 struct snd_seq_client *ptr;
2215 if (snd_BUG_ON(in_interrupt()))
2218 ptr = clientptr(client);
2222 seq_free_client(ptr);
2226 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2228 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2229 * and snd_seq_kernel_client_enqueue_blocking
2231 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2232 struct file *file, int blocking,
2233 int atomic, int hop)
2235 struct snd_seq_client *cptr;
2238 if (snd_BUG_ON(!ev))
2241 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2242 return 0; /* ignore this */
2243 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2244 return -EINVAL; /* quoted events can't be enqueued */
2246 /* fill in client number */
2247 ev->source.client = client;
2249 if (check_event_type_and_length(ev))
2252 cptr = snd_seq_client_use_ptr(client);
2256 if (! cptr->accept_output)
2259 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2261 snd_seq_client_unlock(cptr);
2266 * exported, called by kernel clients to enqueue events (w/o blocking)
2268 * RETURN VALUE: zero if succeed, negative if error
2270 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2271 int atomic, int hop)
2273 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2275 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2278 * exported, called by kernel clients to enqueue events (with blocking)
2280 * RETURN VALUE: zero if succeed, negative if error
2282 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2284 int atomic, int hop)
2286 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2288 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2291 * exported, called by kernel clients to dispatch events directly to other
2292 * clients, bypassing the queues. Event time-stamp will be updated.
2294 * RETURN VALUE: negative = delivery failed,
2295 * zero, or positive: the number of delivered events
2297 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2298 int atomic, int hop)
2300 struct snd_seq_client *cptr;
2303 if (snd_BUG_ON(!ev))
2306 /* fill in client number */
2307 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2308 ev->source.client = client;
2310 if (check_event_type_and_length(ev))
2313 cptr = snd_seq_client_use_ptr(client);
2317 if (!cptr->accept_output)
2320 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2322 snd_seq_client_unlock(cptr);
2325 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2328 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2330 * @clientid: A numerical ID for a client.
2331 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2332 * @arg: A pointer to data in kernel space.
2334 * Against its name, both kernel/application client can be handled by this
2335 * kernel API. A pointer of 'arg' argument should be in kernel space.
2337 * Return: 0 at success. Negative error code at failure.
2339 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2341 const struct ioctl_handler *handler;
2342 struct snd_seq_client *client;
2344 client = clientptr(clientid);
2348 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2349 if (handler->cmd == cmd)
2350 return handler->func(client, arg);
2353 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2354 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2357 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2359 /* exported (for OSS emulator) */
2360 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2362 struct snd_seq_client *client;
2364 client = clientptr(clientid);
2368 if (! snd_seq_write_pool_allocated(client))
2370 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2374 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2376 /*---------------------------------------------------------------------------*/
2378 #ifdef CONFIG_SND_PROC_FS
2382 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2383 struct snd_seq_port_subs_info *group,
2384 int is_src, char *msg)
2386 struct list_head *p;
2387 struct snd_seq_subscribers *s;
2390 down_read(&group->list_mutex);
2391 if (list_empty(&group->list_head)) {
2392 up_read(&group->list_mutex);
2395 snd_iprintf(buffer, msg);
2396 list_for_each(p, &group->list_head) {
2398 s = list_entry(p, struct snd_seq_subscribers, src_list);
2400 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2402 snd_iprintf(buffer, ", ");
2403 snd_iprintf(buffer, "%d:%d",
2404 is_src ? s->info.dest.client : s->info.sender.client,
2405 is_src ? s->info.dest.port : s->info.sender.port);
2406 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2407 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2408 if (group->exclusive)
2409 snd_iprintf(buffer, "[ex]");
2411 up_read(&group->list_mutex);
2412 snd_iprintf(buffer, "\n");
2415 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2416 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2417 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2419 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2421 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2422 struct snd_seq_client *client)
2424 struct snd_seq_client_port *p;
2426 mutex_lock(&client->ports_mutex);
2427 list_for_each_entry(p, &client->ports_list_head, list) {
2428 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2429 p->addr.port, p->name,
2430 FLAG_PERM_RD(p->capability),
2431 FLAG_PERM_WR(p->capability),
2432 FLAG_PERM_EX(p->capability),
2433 FLAG_PERM_DUPLEX(p->capability));
2434 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2435 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2437 mutex_unlock(&client->ports_mutex);
2441 /* exported to seq_info.c */
2442 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2443 struct snd_info_buffer *buffer)
2446 struct snd_seq_client *client;
2448 snd_iprintf(buffer, "Client info\n");
2449 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2450 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2451 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2452 snd_iprintf(buffer, "\n");
2454 /* list the client table */
2455 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2456 client = snd_seq_client_use_ptr(c);
2459 if (client->type == NO_CLIENT) {
2460 snd_seq_client_unlock(client);
2464 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2466 client->type == USER_CLIENT ? "User" : "Kernel");
2467 snd_seq_info_dump_ports(buffer, client);
2468 if (snd_seq_write_pool_allocated(client)) {
2469 snd_iprintf(buffer, " Output pool :\n");
2470 snd_seq_info_pool(buffer, client->pool, " ");
2472 if (client->type == USER_CLIENT && client->data.user.fifo &&
2473 client->data.user.fifo->pool) {
2474 snd_iprintf(buffer, " Input pool :\n");
2475 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2477 snd_seq_client_unlock(client);
2480 #endif /* CONFIG_SND_PROC_FS */
2482 /*---------------------------------------------------------------------------*/
2489 static const struct file_operations snd_seq_f_ops =
2491 .owner = THIS_MODULE,
2492 .read = snd_seq_read,
2493 .write = snd_seq_write,
2494 .open = snd_seq_open,
2495 .release = snd_seq_release,
2496 .llseek = no_llseek,
2497 .poll = snd_seq_poll,
2498 .unlocked_ioctl = snd_seq_ioctl,
2499 .compat_ioctl = snd_seq_ioctl_compat,
2502 static struct device seq_dev;
2505 * register sequencer device
2507 int __init snd_sequencer_device_init(void)
2511 snd_device_initialize(&seq_dev, NULL);
2512 dev_set_name(&seq_dev, "seq");
2514 if (mutex_lock_interruptible(®ister_mutex))
2515 return -ERESTARTSYS;
2517 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2518 &snd_seq_f_ops, NULL, &seq_dev);
2520 mutex_unlock(®ister_mutex);
2521 put_device(&seq_dev);
2525 mutex_unlock(®ister_mutex);
2533 * unregister sequencer device
2535 void __exit snd_sequencer_device_done(void)
2537 snd_unregister_device(&seq_dev);
2538 put_device(&seq_dev);