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 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 spin_lock_irqsave(&clients_lock, flags);
259 clienttablock[client->number] = 1;
260 clienttab[client->number] = NULL;
261 spin_unlock_irqrestore(&clients_lock, flags);
262 snd_seq_delete_all_ports(client);
263 snd_seq_queue_client_leave(client->number);
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 mutex_lock(®ister_mutex);
315 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
317 mutex_unlock(®ister_mutex);
318 return -ENOMEM; /* failure code */
321 mode = snd_seq_file_flags(file);
322 if (mode & SNDRV_SEQ_LFLG_INPUT)
323 client->accept_input = 1;
324 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
325 client->accept_output = 1;
327 user = &client->data.user;
329 user->fifo_pool_size = 0;
331 if (mode & SNDRV_SEQ_LFLG_INPUT) {
332 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
333 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
334 if (user->fifo == NULL) {
335 seq_free_client1(client);
337 mutex_unlock(®ister_mutex);
342 usage_alloc(&client_usage, 1);
343 client->type = USER_CLIENT;
344 mutex_unlock(®ister_mutex);
347 file->private_data = client;
349 /* fill client data */
351 sprintf(client->name, "Client-%d", c);
352 client->data.user.owner = get_pid(task_pid(current));
354 /* make others aware this new client */
355 snd_seq_system_client_ev_client_start(c);
360 /* delete a user client */
361 static int snd_seq_release(struct inode *inode, struct file *file)
363 struct snd_seq_client *client = file->private_data;
366 seq_free_client(client);
367 if (client->data.user.fifo)
368 snd_seq_fifo_delete(&client->data.user.fifo);
369 put_pid(client->data.user.owner);
377 /* handle client read() */
378 /* possible error values:
379 * -ENXIO invalid client or file open mode
380 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
381 * -EINVAL no enough user-space buffer to write the whole event
382 * -EFAULT seg. fault during copy to user space
384 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
387 struct snd_seq_client *client = file->private_data;
388 struct snd_seq_fifo *fifo;
391 struct snd_seq_event_cell *cell;
393 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
396 if (!access_ok(VERIFY_WRITE, buf, count))
399 /* check client structures are in place */
400 if (snd_BUG_ON(!client))
403 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
406 if (atomic_read(&fifo->overflow) > 0) {
407 /* buffer overflow is detected */
408 snd_seq_fifo_clear(fifo);
409 /* return error code */
415 snd_seq_fifo_lock(fifo);
417 /* while data available in queue */
418 while (count >= sizeof(struct snd_seq_event)) {
421 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
422 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
425 if (snd_seq_ev_is_variable(&cell->event)) {
426 struct snd_seq_event tmpev;
428 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
429 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
433 count -= sizeof(struct snd_seq_event);
434 buf += sizeof(struct snd_seq_event);
435 err = snd_seq_expand_var_event(&cell->event, count,
436 (char __force *)buf, 0,
437 sizeof(struct snd_seq_event));
444 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
448 count -= sizeof(struct snd_seq_event);
449 buf += sizeof(struct snd_seq_event);
451 snd_seq_cell_free(cell);
452 cell = NULL; /* to be sure */
453 result += sizeof(struct snd_seq_event);
458 snd_seq_fifo_cell_putback(fifo, cell);
459 if (err == -EAGAIN && result > 0)
462 snd_seq_fifo_unlock(fifo);
464 return (err < 0) ? err : result;
469 * check access permission to the port
471 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
473 if ((port->capability & flags) != flags)
479 * check if the destination client is available, and return the pointer
480 * if filter is non-zero, client filter bitmap is tested.
482 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
485 struct snd_seq_client *dest;
487 dest = snd_seq_client_use_ptr(event->dest.client);
490 if (! dest->accept_input)
492 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
493 ! test_bit(event->type, dest->event_filter))
495 if (filter && !(dest->filter & filter))
498 return dest; /* ok - accessible */
500 snd_seq_client_unlock(dest);
506 * Return the error event.
508 * If the receiver client is a user client, the original event is
509 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
510 * the original event is also variable length, the external data is
511 * copied after the event record.
512 * If the receiver client is a kernel client, the original event is
513 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
516 static int bounce_error_event(struct snd_seq_client *client,
517 struct snd_seq_event *event,
518 int err, int atomic, int hop)
520 struct snd_seq_event bounce_ev;
523 if (client == NULL ||
524 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
525 ! client->accept_input)
526 return 0; /* ignored */
528 /* set up quoted error */
529 memset(&bounce_ev, 0, sizeof(bounce_ev));
530 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
531 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
532 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
533 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
534 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
535 bounce_ev.dest.client = client->number;
536 bounce_ev.dest.port = event->source.port;
537 bounce_ev.data.quote.origin = event->dest;
538 bounce_ev.data.quote.event = event;
539 bounce_ev.data.quote.value = -err; /* use positive value */
540 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
542 client->event_lost++;
551 * rewrite the time-stamp of the event record with the curren time
552 * of the given queue.
553 * return non-zero if updated.
555 static int update_timestamp_of_queue(struct snd_seq_event *event,
556 int queue, int real_time)
558 struct snd_seq_queue *q;
563 event->queue = queue;
564 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
566 event->time.time = snd_seq_timer_get_cur_time(q->timer, true);
567 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
569 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
570 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
578 * deliver an event to the specified destination.
579 * if filter is non-zero, client filter bitmap is tested.
581 * RETURN VALUE: 0 : if succeeded
584 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
585 struct snd_seq_event *event,
586 int filter, int atomic, int hop)
588 struct snd_seq_client *dest = NULL;
589 struct snd_seq_client_port *dest_port = NULL;
590 int result = -ENOENT;
593 direct = snd_seq_ev_is_direct(event);
595 dest = get_event_dest_client(event, filter);
598 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
599 if (dest_port == NULL)
602 /* check permission */
603 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
608 if (dest_port->timestamping)
609 update_timestamp_of_queue(event, dest_port->time_queue,
610 dest_port->time_real);
612 switch (dest->type) {
614 if (dest->data.user.fifo)
615 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
619 if (dest_port->event_input == NULL)
621 result = dest_port->event_input(event, direct,
622 dest_port->private_data,
631 snd_seq_port_unlock(dest_port);
633 snd_seq_client_unlock(dest);
635 if (result < 0 && !direct) {
636 result = bounce_error_event(client, event, result, atomic, hop);
643 * send the event to all subscribers:
645 static int deliver_to_subscribers(struct snd_seq_client *client,
646 struct snd_seq_event *event,
649 struct snd_seq_subscribers *subs;
650 int err, result = 0, num_ev = 0;
651 struct snd_seq_event event_saved;
652 struct snd_seq_client_port *src_port;
653 struct snd_seq_port_subs_info *grp;
655 src_port = snd_seq_port_use_ptr(client, event->source.port);
656 if (src_port == NULL)
657 return -EINVAL; /* invalid source port */
658 /* save original event record */
659 event_saved = *event;
660 grp = &src_port->c_src;
664 read_lock(&grp->list_lock);
666 down_read_nested(&grp->list_mutex, hop);
667 list_for_each_entry(subs, &grp->list_head, src_list) {
668 /* both ports ready? */
669 if (atomic_read(&subs->ref_count) != 2)
671 event->dest = subs->info.dest;
672 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
673 /* convert time according to flag with subscription */
674 update_timestamp_of_queue(event, subs->info.queue,
675 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
676 err = snd_seq_deliver_single_event(client, event,
679 /* save first error that occurs and continue */
685 /* restore original event record */
686 *event = event_saved;
689 read_unlock(&grp->list_lock);
691 up_read(&grp->list_mutex);
692 *event = event_saved; /* restore */
693 snd_seq_port_unlock(src_port);
694 return (result < 0) ? result : num_ev;
698 #ifdef SUPPORT_BROADCAST
700 * broadcast to all ports:
702 static int port_broadcast_event(struct snd_seq_client *client,
703 struct snd_seq_event *event,
706 int num_ev = 0, err, result = 0;
707 struct snd_seq_client *dest_client;
708 struct snd_seq_client_port *port;
710 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
711 if (dest_client == NULL)
712 return 0; /* no matching destination */
714 read_lock(&dest_client->ports_lock);
715 list_for_each_entry(port, &dest_client->ports_list_head, list) {
716 event->dest.port = port->addr.port;
717 /* pass NULL as source client to avoid error bounce */
718 err = snd_seq_deliver_single_event(NULL, event,
719 SNDRV_SEQ_FILTER_BROADCAST,
722 /* save first error that occurs and continue */
729 read_unlock(&dest_client->ports_lock);
730 snd_seq_client_unlock(dest_client);
731 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
732 return (result < 0) ? result : num_ev;
736 * send the event to all clients:
737 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
739 static int broadcast_event(struct snd_seq_client *client,
740 struct snd_seq_event *event, int atomic, int hop)
742 int err, result = 0, num_ev = 0;
744 struct snd_seq_addr addr;
746 addr = event->dest; /* save */
748 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
749 /* don't send to itself */
750 if (dest == client->number)
752 event->dest.client = dest;
753 event->dest.port = addr.port;
754 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
755 err = port_broadcast_event(client, event, atomic, hop);
757 /* pass NULL as source client to avoid error bounce */
758 err = snd_seq_deliver_single_event(NULL, event,
759 SNDRV_SEQ_FILTER_BROADCAST,
762 /* save first error that occurs and continue */
769 event->dest = addr; /* restore */
770 return (result < 0) ? result : num_ev;
774 /* multicast - not supported yet */
775 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
778 pr_debug("ALSA: seq: multicast not supported yet.\n");
779 return 0; /* ignored */
781 #endif /* SUPPORT_BROADCAST */
784 /* deliver an event to the destination port(s).
785 * if the event is to subscribers or broadcast, the event is dispatched
786 * to multiple targets.
788 * RETURN VALUE: n > 0 : the number of delivered events.
789 * n == 0 : the event was not passed to any client.
790 * n < 0 : error - event was not processed.
792 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
798 if (hop >= SNDRV_SEQ_MAX_HOPS) {
799 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
800 event->source.client, event->source.port,
801 event->dest.client, event->dest.port);
805 if (snd_seq_ev_is_variable(event) &&
806 snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
809 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
810 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
811 result = deliver_to_subscribers(client, event, atomic, hop);
812 #ifdef SUPPORT_BROADCAST
813 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
814 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
815 result = broadcast_event(client, event, atomic, hop);
816 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
817 result = multicast_event(client, event, atomic, hop);
818 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
819 result = port_broadcast_event(client, event, atomic, hop);
822 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
828 * dispatch an event cell:
829 * This function is called only from queue check routines in timer
830 * interrupts or after enqueued.
831 * The event cell shall be released or re-queued in this function.
833 * RETURN VALUE: n > 0 : the number of delivered events.
834 * n == 0 : the event was not passed to any client.
835 * n < 0 : error - event was not processed.
837 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
839 struct snd_seq_client *client;
842 if (snd_BUG_ON(!cell))
845 client = snd_seq_client_use_ptr(cell->event.source.client);
846 if (client == NULL) {
847 snd_seq_cell_free(cell); /* release this cell */
851 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
853 * the event cell is re-used as a NOTE-OFF event and
856 struct snd_seq_event tmpev, *ev;
858 /* reserve this event to enqueue note-off later */
860 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
861 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
864 * This was originally a note event. We now re-use the
865 * cell for the note-off event.
869 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
870 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
872 /* add the duration time */
873 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
874 case SNDRV_SEQ_TIME_STAMP_TICK:
875 ev->time.tick += ev->data.note.duration;
877 case SNDRV_SEQ_TIME_STAMP_REAL:
878 /* unit for duration is ms */
879 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
880 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
881 ev->time.time.tv_nsec / 1000000000;
882 ev->time.time.tv_nsec %= 1000000000;
885 ev->data.note.velocity = ev->data.note.off_velocity;
887 /* Now queue this cell as the note off event */
888 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
889 snd_seq_cell_free(cell); /* release this cell */
893 * event cell is freed after processing the event
896 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
897 snd_seq_cell_free(cell);
900 snd_seq_client_unlock(client);
905 /* Allocate a cell from client pool and enqueue it to queue:
906 * if pool is empty and blocking is TRUE, sleep until a new cell is
909 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
910 struct snd_seq_event *event,
911 struct file *file, int blocking,
913 struct mutex *mutexp)
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,
956 /* we got a cell. enqueue it. */
957 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
958 snd_seq_cell_free(cell);
967 * check validity of event type and data length.
968 * return non-zero if invalid.
970 static int check_event_type_and_length(struct snd_seq_event *ev)
972 switch (snd_seq_ev_length_type(ev)) {
973 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
974 if (snd_seq_ev_is_variable_type(ev))
977 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
978 if (! snd_seq_ev_is_variable_type(ev) ||
979 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
982 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
983 if (! snd_seq_ev_is_direct(ev))
992 /* possible error values:
993 * -ENXIO invalid client or file open mode
994 * -ENOMEM malloc failed
995 * -EFAULT seg. fault during copy from user space
996 * -EINVAL invalid event
997 * -EAGAIN no space in output pool
998 * -EINTR interrupts while sleep
999 * -EMLINK too many hops
1000 * others depends on return value from driver callback
1002 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1003 size_t count, loff_t *offset)
1005 struct snd_seq_client *client = file->private_data;
1006 int written = 0, len;
1008 struct snd_seq_event event;
1010 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1013 /* check client structures are in place */
1014 if (snd_BUG_ON(!client))
1017 if (!client->accept_output || client->pool == NULL)
1022 /* allocate the pool now if the pool is not allocated yet */
1023 mutex_lock(&client->ioctl_mutex);
1024 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1025 err = snd_seq_pool_init(client->pool);
1030 /* only process whole events */
1032 while (count >= sizeof(struct snd_seq_event)) {
1033 /* Read in the event header from the user */
1034 len = sizeof(event);
1035 if (copy_from_user(&event, buf, len)) {
1039 event.source.client = client->number; /* fill in client number */
1040 /* Check for extension data length */
1041 if (check_event_type_and_length(&event)) {
1046 /* check for special events */
1047 if (event.type == SNDRV_SEQ_EVENT_NONE)
1049 else if (snd_seq_ev_is_reserved(&event)) {
1054 if (snd_seq_ev_is_variable(&event)) {
1055 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1056 if ((size_t)(extlen + len) > count) {
1057 /* back out, will get an error this time or next */
1061 /* set user space pointer */
1062 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1063 event.data.ext.ptr = (char __force *)buf
1064 + sizeof(struct snd_seq_event);
1065 len += extlen; /* increment data length */
1067 #ifdef CONFIG_COMPAT
1068 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1069 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1070 event.data.ext.ptr = ptr;
1075 /* ok, enqueue it */
1076 err = snd_seq_client_enqueue_event(client, &event, file,
1077 !(file->f_flags & O_NONBLOCK),
1078 0, 0, &client->ioctl_mutex);
1084 /* Update pointers and counts */
1089 /* let's have a coffee break if too many events are queued */
1090 if (++handled >= 200) {
1091 mutex_unlock(&client->ioctl_mutex);
1097 mutex_unlock(&client->ioctl_mutex);
1098 return written ? written : err;
1105 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1107 struct snd_seq_client *client = file->private_data;
1110 /* check client structures are in place */
1111 if (snd_BUG_ON(!client))
1114 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1115 client->data.user.fifo) {
1117 /* check if data is available in the outqueue */
1118 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1119 mask |= EPOLLIN | EPOLLRDNORM;
1122 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1124 /* check if data is available in the pool */
1125 if (!snd_seq_write_pool_allocated(client) ||
1126 snd_seq_pool_poll_wait(client->pool, file, wait))
1127 mask |= EPOLLOUT | EPOLLWRNORM;
1134 /*-----------------------------------------------------*/
1136 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1138 int *pversion = arg;
1140 *pversion = SNDRV_SEQ_VERSION;
1144 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1146 int *client_id = arg;
1148 *client_id = client->number;
1152 /* SYSTEM_INFO ioctl() */
1153 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1155 struct snd_seq_system_info *info = arg;
1157 memset(info, 0, sizeof(*info));
1158 /* fill the info fields */
1159 info->queues = SNDRV_SEQ_MAX_QUEUES;
1160 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1161 info->ports = SNDRV_SEQ_MAX_PORTS;
1162 info->channels = 256; /* fixed limit */
1163 info->cur_clients = client_usage.cur;
1164 info->cur_queues = snd_seq_queue_get_cur_queues();
1170 /* RUNNING_MODE ioctl() */
1171 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1173 struct snd_seq_running_info *info = arg;
1174 struct snd_seq_client *cptr;
1177 /* requested client number */
1178 cptr = snd_seq_client_use_ptr(info->client);
1180 return -ENOENT; /* don't change !!! */
1182 #ifdef SNDRV_BIG_ENDIAN
1183 if (!info->big_endian) {
1188 if (info->big_endian) {
1194 if (info->cpu_mode > sizeof(long)) {
1198 cptr->convert32 = (info->cpu_mode < sizeof(long));
1200 snd_seq_client_unlock(cptr);
1204 /* CLIENT_INFO ioctl() */
1205 static void get_client_info(struct snd_seq_client *cptr,
1206 struct snd_seq_client_info *info)
1208 info->client = cptr->number;
1210 /* fill the info fields */
1211 info->type = cptr->type;
1212 strcpy(info->name, cptr->name);
1213 info->filter = cptr->filter;
1214 info->event_lost = cptr->event_lost;
1215 memcpy(info->event_filter, cptr->event_filter, 32);
1216 info->num_ports = cptr->num_ports;
1218 if (cptr->type == USER_CLIENT)
1219 info->pid = pid_vnr(cptr->data.user.owner);
1223 if (cptr->type == KERNEL_CLIENT)
1224 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1228 memset(info->reserved, 0, sizeof(info->reserved));
1231 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1234 struct snd_seq_client_info *client_info = arg;
1235 struct snd_seq_client *cptr;
1237 /* requested client number */
1238 cptr = snd_seq_client_use_ptr(client_info->client);
1240 return -ENOENT; /* don't change !!! */
1242 get_client_info(cptr, client_info);
1243 snd_seq_client_unlock(cptr);
1249 /* CLIENT_INFO ioctl() */
1250 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1253 struct snd_seq_client_info *client_info = arg;
1255 /* it is not allowed to set the info fields for an another client */
1256 if (client->number != client_info->client)
1258 /* also client type must be set now */
1259 if (client->type != client_info->type)
1262 /* fill the info fields */
1263 if (client_info->name[0])
1264 strscpy(client->name, client_info->name, sizeof(client->name));
1266 client->filter = client_info->filter;
1267 client->event_lost = client_info->event_lost;
1268 memcpy(client->event_filter, client_info->event_filter, 32);
1275 * CREATE PORT ioctl()
1277 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1279 struct snd_seq_port_info *info = arg;
1280 struct snd_seq_client_port *port;
1281 struct snd_seq_port_callback *callback;
1284 /* it is not allowed to create the port for an another client */
1285 if (info->addr.client != client->number)
1288 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1292 if (client->type == USER_CLIENT && info->kernel) {
1293 port_idx = port->addr.port;
1294 snd_seq_port_unlock(port);
1295 snd_seq_delete_port(client, port_idx);
1298 if (client->type == KERNEL_CLIENT) {
1299 if ((callback = info->kernel) != NULL) {
1300 if (callback->owner)
1301 port->owner = callback->owner;
1302 port->private_data = callback->private_data;
1303 port->private_free = callback->private_free;
1304 port->event_input = callback->event_input;
1305 port->c_src.open = callback->subscribe;
1306 port->c_src.close = callback->unsubscribe;
1307 port->c_dest.open = callback->use;
1308 port->c_dest.close = callback->unuse;
1312 info->addr = port->addr;
1314 snd_seq_set_port_info(port, info);
1315 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1316 snd_seq_port_unlock(port);
1322 * DELETE PORT ioctl()
1324 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1326 struct snd_seq_port_info *info = arg;
1329 /* it is not allowed to remove the port for an another client */
1330 if (info->addr.client != client->number)
1333 err = snd_seq_delete_port(client, info->addr.port);
1335 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1341 * GET_PORT_INFO ioctl() (on any client)
1343 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1345 struct snd_seq_port_info *info = arg;
1346 struct snd_seq_client *cptr;
1347 struct snd_seq_client_port *port;
1349 cptr = snd_seq_client_use_ptr(info->addr.client);
1353 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1355 snd_seq_client_unlock(cptr);
1356 return -ENOENT; /* don't change */
1360 snd_seq_get_port_info(port, info);
1361 snd_seq_port_unlock(port);
1362 snd_seq_client_unlock(cptr);
1369 * SET_PORT_INFO ioctl() (only ports on this/own client)
1371 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1373 struct snd_seq_port_info *info = arg;
1374 struct snd_seq_client_port *port;
1376 if (info->addr.client != client->number) /* only set our own ports ! */
1378 port = snd_seq_port_use_ptr(client, info->addr.port);
1380 snd_seq_set_port_info(port, info);
1381 snd_seq_port_unlock(port);
1388 * port subscription (connection)
1390 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1391 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1393 static int check_subscription_permission(struct snd_seq_client *client,
1394 struct snd_seq_client_port *sport,
1395 struct snd_seq_client_port *dport,
1396 struct snd_seq_port_subscribe *subs)
1398 if (client->number != subs->sender.client &&
1399 client->number != subs->dest.client) {
1400 /* connection by third client - check export permission */
1401 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1403 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1407 /* check read permission */
1408 /* if sender or receiver is the subscribing client itself,
1409 * no permission check is necessary
1411 if (client->number != subs->sender.client) {
1412 if (! check_port_perm(sport, PERM_RD))
1415 /* check write permission */
1416 if (client->number != subs->dest.client) {
1417 if (! check_port_perm(dport, PERM_WR))
1424 * send an subscription notify event to user client:
1425 * client must be user client.
1427 int snd_seq_client_notify_subscription(int client, int port,
1428 struct snd_seq_port_subscribe *info,
1431 struct snd_seq_event event;
1433 memset(&event, 0, sizeof(event));
1434 event.type = evtype;
1435 event.data.connect.dest = info->dest;
1436 event.data.connect.sender = info->sender;
1438 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1443 * add to port's subscription list IOCTL interface
1445 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1448 struct snd_seq_port_subscribe *subs = arg;
1449 int result = -EINVAL;
1450 struct snd_seq_client *receiver = NULL, *sender = NULL;
1451 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1453 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1455 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1457 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1459 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1462 result = check_subscription_permission(client, sport, dport, subs);
1467 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1468 if (! result) /* broadcast announce */
1469 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1470 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1473 snd_seq_port_unlock(sport);
1475 snd_seq_port_unlock(dport);
1477 snd_seq_client_unlock(sender);
1479 snd_seq_client_unlock(receiver);
1485 * remove from port's subscription list
1487 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1490 struct snd_seq_port_subscribe *subs = arg;
1491 int result = -ENXIO;
1492 struct snd_seq_client *receiver = NULL, *sender = NULL;
1493 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1495 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1497 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1499 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1501 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1504 result = check_subscription_permission(client, sport, dport, subs);
1508 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1509 if (! result) /* broadcast announce */
1510 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1511 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1514 snd_seq_port_unlock(sport);
1516 snd_seq_port_unlock(dport);
1518 snd_seq_client_unlock(sender);
1520 snd_seq_client_unlock(receiver);
1525 /* CREATE_QUEUE ioctl() */
1526 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1528 struct snd_seq_queue_info *info = arg;
1529 struct snd_seq_queue *q;
1531 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1535 info->queue = q->queue;
1536 info->locked = q->locked;
1537 info->owner = q->owner;
1539 /* set queue name */
1541 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1542 strscpy(q->name, info->name, sizeof(q->name));
1543 snd_use_lock_free(&q->use_lock);
1548 /* DELETE_QUEUE ioctl() */
1549 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1551 struct snd_seq_queue_info *info = arg;
1553 return snd_seq_queue_delete(client->number, info->queue);
1556 /* GET_QUEUE_INFO ioctl() */
1557 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1560 struct snd_seq_queue_info *info = arg;
1561 struct snd_seq_queue *q;
1563 q = queueptr(info->queue);
1567 memset(info, 0, sizeof(*info));
1568 info->queue = q->queue;
1569 info->owner = q->owner;
1570 info->locked = q->locked;
1571 strlcpy(info->name, q->name, sizeof(info->name));
1577 /* SET_QUEUE_INFO ioctl() */
1578 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1581 struct snd_seq_queue_info *info = arg;
1582 struct snd_seq_queue *q;
1584 if (info->owner != client->number)
1587 /* change owner/locked permission */
1588 if (snd_seq_queue_check_access(info->queue, client->number)) {
1589 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1592 snd_seq_queue_use(info->queue, client->number, 1);
1597 q = queueptr(info->queue);
1600 if (q->owner != client->number) {
1604 strscpy(q->name, info->name, sizeof(q->name));
1610 /* GET_NAMED_QUEUE ioctl() */
1611 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1614 struct snd_seq_queue_info *info = arg;
1615 struct snd_seq_queue *q;
1617 q = snd_seq_queue_find_name(info->name);
1620 info->queue = q->queue;
1621 info->owner = q->owner;
1622 info->locked = q->locked;
1628 /* GET_QUEUE_STATUS ioctl() */
1629 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1632 struct snd_seq_queue_status *status = arg;
1633 struct snd_seq_queue *queue;
1634 struct snd_seq_timer *tmr;
1636 queue = queueptr(status->queue);
1639 memset(status, 0, sizeof(*status));
1640 status->queue = queue->queue;
1643 status->events = queue->tickq->cells + queue->timeq->cells;
1645 status->time = snd_seq_timer_get_cur_time(tmr, true);
1646 status->tick = snd_seq_timer_get_cur_tick(tmr);
1648 status->running = tmr->running;
1650 status->flags = queue->flags;
1657 /* GET_QUEUE_TEMPO ioctl() */
1658 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1661 struct snd_seq_queue_tempo *tempo = arg;
1662 struct snd_seq_queue *queue;
1663 struct snd_seq_timer *tmr;
1665 queue = queueptr(tempo->queue);
1668 memset(tempo, 0, sizeof(*tempo));
1669 tempo->queue = queue->queue;
1673 tempo->tempo = tmr->tempo;
1674 tempo->ppq = tmr->ppq;
1675 tempo->skew_value = tmr->skew;
1676 tempo->skew_base = tmr->skew_base;
1683 /* SET_QUEUE_TEMPO ioctl() */
1684 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1686 if (!snd_seq_queue_check_access(tempo->queue, client))
1688 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1690 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1692 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1695 struct snd_seq_queue_tempo *tempo = arg;
1698 result = snd_seq_set_queue_tempo(client->number, tempo);
1699 return result < 0 ? result : 0;
1703 /* GET_QUEUE_TIMER ioctl() */
1704 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1707 struct snd_seq_queue_timer *timer = arg;
1708 struct snd_seq_queue *queue;
1709 struct snd_seq_timer *tmr;
1711 queue = queueptr(timer->queue);
1715 mutex_lock(&queue->timer_mutex);
1717 memset(timer, 0, sizeof(*timer));
1718 timer->queue = queue->queue;
1720 timer->type = tmr->type;
1721 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1722 timer->u.alsa.id = tmr->alsa_id;
1723 timer->u.alsa.resolution = tmr->preferred_resolution;
1725 mutex_unlock(&queue->timer_mutex);
1732 /* SET_QUEUE_TIMER ioctl() */
1733 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1736 struct snd_seq_queue_timer *timer = arg;
1739 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1742 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1743 struct snd_seq_queue *q;
1744 struct snd_seq_timer *tmr;
1746 q = queueptr(timer->queue);
1749 mutex_lock(&q->timer_mutex);
1751 snd_seq_queue_timer_close(timer->queue);
1752 tmr->type = timer->type;
1753 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1754 tmr->alsa_id = timer->u.alsa.id;
1755 tmr->preferred_resolution = timer->u.alsa.resolution;
1757 result = snd_seq_queue_timer_open(timer->queue);
1758 mutex_unlock(&q->timer_mutex);
1768 /* GET_QUEUE_CLIENT ioctl() */
1769 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1772 struct snd_seq_queue_client *info = arg;
1775 used = snd_seq_queue_is_used(info->queue, client->number);
1779 info->client = client->number;
1785 /* SET_QUEUE_CLIENT ioctl() */
1786 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1789 struct snd_seq_queue_client *info = arg;
1792 if (info->used >= 0) {
1793 err = snd_seq_queue_use(info->queue, client->number, info->used);
1798 return snd_seq_ioctl_get_queue_client(client, arg);
1802 /* GET_CLIENT_POOL ioctl() */
1803 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1806 struct snd_seq_client_pool *info = arg;
1807 struct snd_seq_client *cptr;
1809 cptr = snd_seq_client_use_ptr(info->client);
1812 memset(info, 0, sizeof(*info));
1813 info->client = cptr->number;
1814 info->output_pool = cptr->pool->size;
1815 info->output_room = cptr->pool->room;
1816 info->output_free = info->output_pool;
1817 info->output_free = snd_seq_unused_cells(cptr->pool);
1818 if (cptr->type == USER_CLIENT) {
1819 info->input_pool = cptr->data.user.fifo_pool_size;
1820 info->input_free = info->input_pool;
1821 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
1823 info->input_pool = 0;
1824 info->input_free = 0;
1826 snd_seq_client_unlock(cptr);
1831 /* SET_CLIENT_POOL ioctl() */
1832 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1835 struct snd_seq_client_pool *info = arg;
1838 if (client->number != info->client)
1839 return -EINVAL; /* can't change other clients */
1841 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1842 (! snd_seq_write_pool_allocated(client) ||
1843 info->output_pool != client->pool->size)) {
1844 if (snd_seq_write_pool_allocated(client)) {
1845 /* is the pool in use? */
1846 if (atomic_read(&client->pool->counter))
1848 /* remove all existing cells */
1849 snd_seq_pool_mark_closing(client->pool);
1850 snd_seq_pool_done(client->pool);
1852 client->pool->size = info->output_pool;
1853 rc = snd_seq_pool_init(client->pool);
1857 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1858 info->input_pool >= 1 &&
1859 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1860 info->input_pool != client->data.user.fifo_pool_size) {
1861 /* change pool size */
1862 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1865 client->data.user.fifo_pool_size = info->input_pool;
1867 if (info->output_room >= 1 &&
1868 info->output_room <= client->pool->size) {
1869 client->pool->room = info->output_room;
1872 return snd_seq_ioctl_get_client_pool(client, arg);
1876 /* REMOVE_EVENTS ioctl() */
1877 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1880 struct snd_seq_remove_events *info = arg;
1883 * Input mostly not implemented XXX.
1885 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1887 * No restrictions so for a user client we can clear
1890 if (client->type == USER_CLIENT && client->data.user.fifo)
1891 snd_seq_fifo_clear(client->data.user.fifo);
1894 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1895 snd_seq_queue_remove_cells(client->number, info);
1902 * get subscription info
1904 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1907 struct snd_seq_port_subscribe *subs = arg;
1909 struct snd_seq_client *sender = NULL;
1910 struct snd_seq_client_port *sport = NULL;
1913 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1915 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1917 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest,
1921 snd_seq_port_unlock(sport);
1923 snd_seq_client_unlock(sender);
1930 * get subscription info - check only its presence
1932 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1934 struct snd_seq_query_subs *subs = arg;
1935 int result = -ENXIO;
1936 struct snd_seq_client *cptr = NULL;
1937 struct snd_seq_client_port *port = NULL;
1938 struct snd_seq_port_subs_info *group;
1939 struct list_head *p;
1942 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1944 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1947 switch (subs->type) {
1948 case SNDRV_SEQ_QUERY_SUBS_READ:
1949 group = &port->c_src;
1951 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1952 group = &port->c_dest;
1958 down_read(&group->list_mutex);
1959 /* search for the subscriber */
1960 subs->num_subs = group->count;
1963 list_for_each(p, &group->list_head) {
1964 if (i++ == subs->index) {
1966 struct snd_seq_subscribers *s;
1967 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1968 s = list_entry(p, struct snd_seq_subscribers, src_list);
1969 subs->addr = s->info.dest;
1971 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1972 subs->addr = s->info.sender;
1974 subs->flags = s->info.flags;
1975 subs->queue = s->info.queue;
1980 up_read(&group->list_mutex);
1984 snd_seq_port_unlock(port);
1986 snd_seq_client_unlock(cptr);
1995 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1998 struct snd_seq_client_info *info = arg;
1999 struct snd_seq_client *cptr = NULL;
2001 /* search for next client */
2002 if (info->client < INT_MAX)
2004 if (info->client < 0)
2006 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2007 cptr = snd_seq_client_use_ptr(info->client);
2014 get_client_info(cptr, info);
2015 snd_seq_client_unlock(cptr);
2023 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2026 struct snd_seq_port_info *info = arg;
2027 struct snd_seq_client *cptr;
2028 struct snd_seq_client_port *port = NULL;
2030 cptr = snd_seq_client_use_ptr(info->addr.client);
2034 /* search for next port */
2036 port = snd_seq_port_query_nearest(cptr, info);
2038 snd_seq_client_unlock(cptr);
2043 info->addr = port->addr;
2044 snd_seq_get_port_info(port, info);
2045 snd_seq_port_unlock(port);
2046 snd_seq_client_unlock(cptr);
2051 /* -------------------------------------------------------- */
2053 static const struct ioctl_handler {
2055 int (*func)(struct snd_seq_client *client, void *arg);
2056 } ioctl_handlers[] = {
2057 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2058 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2059 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2060 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2061 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2062 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2063 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2064 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2065 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2066 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2067 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2068 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2069 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2070 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2071 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2072 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2073 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2074 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2075 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2076 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2077 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2078 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2079 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2080 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2081 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2082 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2083 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2084 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2085 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2086 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2087 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2091 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2094 struct snd_seq_client *client = file->private_data;
2095 /* To use kernel stack for ioctl data. */
2099 struct snd_seq_system_info system_info;
2100 struct snd_seq_running_info running_info;
2101 struct snd_seq_client_info client_info;
2102 struct snd_seq_port_info port_info;
2103 struct snd_seq_port_subscribe port_subscribe;
2104 struct snd_seq_queue_info queue_info;
2105 struct snd_seq_queue_status queue_status;
2106 struct snd_seq_queue_tempo tempo;
2107 struct snd_seq_queue_timer queue_timer;
2108 struct snd_seq_queue_client queue_client;
2109 struct snd_seq_client_pool client_pool;
2110 struct snd_seq_remove_events remove_events;
2111 struct snd_seq_query_subs query_subs;
2113 const struct ioctl_handler *handler;
2117 if (snd_BUG_ON(!client))
2120 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2121 if (handler->cmd == cmd)
2124 if (handler->cmd == 0)
2127 memset(&buf, 0, sizeof(buf));
2130 * All of ioctl commands for ALSA sequencer get an argument of size
2131 * within 13 bits. We can safely pick up the size from the command.
2133 size = _IOC_SIZE(handler->cmd);
2134 if (handler->cmd & IOC_IN) {
2135 if (copy_from_user(&buf, (const void __user *)arg, size))
2139 mutex_lock(&client->ioctl_mutex);
2140 err = handler->func(client, &buf);
2141 mutex_unlock(&client->ioctl_mutex);
2143 /* Some commands includes a bug in 'dir' field. */
2144 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2145 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2146 (handler->cmd & IOC_OUT))
2147 if (copy_to_user((void __user *)arg, &buf, size))
2154 #ifdef CONFIG_COMPAT
2155 #include "seq_compat.c"
2157 #define snd_seq_ioctl_compat NULL
2160 /* -------------------------------------------------------- */
2163 /* exported to kernel modules */
2164 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2165 const char *name_fmt, ...)
2167 struct snd_seq_client *client;
2170 if (snd_BUG_ON(in_interrupt()))
2173 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2175 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2178 mutex_lock(®ister_mutex);
2181 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2182 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2183 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2187 /* empty write queue as default */
2188 client = seq_create_client1(client_index, 0);
2189 if (client == NULL) {
2190 mutex_unlock(®ister_mutex);
2191 return -EBUSY; /* failure code */
2193 usage_alloc(&client_usage, 1);
2195 client->accept_input = 1;
2196 client->accept_output = 1;
2197 client->data.kernel.card = card;
2199 va_start(args, name_fmt);
2200 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2203 client->type = KERNEL_CLIENT;
2204 mutex_unlock(®ister_mutex);
2206 /* make others aware this new client */
2207 snd_seq_system_client_ev_client_start(client->number);
2209 /* return client number to caller */
2210 return client->number;
2212 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2214 /* exported to kernel modules */
2215 int snd_seq_delete_kernel_client(int client)
2217 struct snd_seq_client *ptr;
2219 if (snd_BUG_ON(in_interrupt()))
2222 ptr = clientptr(client);
2226 seq_free_client(ptr);
2230 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2232 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2233 * and snd_seq_kernel_client_enqueue_blocking
2235 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2236 struct file *file, int blocking,
2237 int atomic, int hop)
2239 struct snd_seq_client *cptr;
2242 if (snd_BUG_ON(!ev))
2245 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2246 return 0; /* ignore this */
2247 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2248 return -EINVAL; /* quoted events can't be enqueued */
2250 /* fill in client number */
2251 ev->source.client = client;
2253 if (check_event_type_and_length(ev))
2256 cptr = snd_seq_client_use_ptr(client);
2260 if (! cptr->accept_output)
2263 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2266 snd_seq_client_unlock(cptr);
2271 * exported, called by kernel clients to enqueue events (w/o blocking)
2273 * RETURN VALUE: zero if succeed, negative if error
2275 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2276 int atomic, int hop)
2278 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2280 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2283 * exported, called by kernel clients to enqueue events (with blocking)
2285 * RETURN VALUE: zero if succeed, negative if error
2287 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2289 int atomic, int hop)
2291 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2293 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2296 * exported, called by kernel clients to dispatch events directly to other
2297 * clients, bypassing the queues. Event time-stamp will be updated.
2299 * RETURN VALUE: negative = delivery failed,
2300 * zero, or positive: the number of delivered events
2302 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2303 int atomic, int hop)
2305 struct snd_seq_client *cptr;
2308 if (snd_BUG_ON(!ev))
2311 /* fill in client number */
2312 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2313 ev->source.client = client;
2315 if (check_event_type_and_length(ev))
2318 cptr = snd_seq_client_use_ptr(client);
2322 if (!cptr->accept_output)
2325 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2327 snd_seq_client_unlock(cptr);
2330 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2333 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2335 * @clientid: A numerical ID for a client.
2336 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2337 * @arg: A pointer to data in kernel space.
2339 * Against its name, both kernel/application client can be handled by this
2340 * kernel API. A pointer of 'arg' argument should be in kernel space.
2342 * Return: 0 at success. Negative error code at failure.
2344 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2346 const struct ioctl_handler *handler;
2347 struct snd_seq_client *client;
2349 client = clientptr(clientid);
2353 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2354 if (handler->cmd == cmd)
2355 return handler->func(client, arg);
2358 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2359 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2362 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2364 /* exported (for OSS emulator) */
2365 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2367 struct snd_seq_client *client;
2369 client = clientptr(clientid);
2373 if (! snd_seq_write_pool_allocated(client))
2375 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2379 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2381 /*---------------------------------------------------------------------------*/
2383 #ifdef CONFIG_SND_PROC_FS
2387 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2388 struct snd_seq_port_subs_info *group,
2389 int is_src, char *msg)
2391 struct list_head *p;
2392 struct snd_seq_subscribers *s;
2395 down_read(&group->list_mutex);
2396 if (list_empty(&group->list_head)) {
2397 up_read(&group->list_mutex);
2400 snd_iprintf(buffer, msg);
2401 list_for_each(p, &group->list_head) {
2403 s = list_entry(p, struct snd_seq_subscribers, src_list);
2405 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2407 snd_iprintf(buffer, ", ");
2408 snd_iprintf(buffer, "%d:%d",
2409 is_src ? s->info.dest.client : s->info.sender.client,
2410 is_src ? s->info.dest.port : s->info.sender.port);
2411 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2412 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2413 if (group->exclusive)
2414 snd_iprintf(buffer, "[ex]");
2416 up_read(&group->list_mutex);
2417 snd_iprintf(buffer, "\n");
2420 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2421 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2422 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2424 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2426 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2427 struct snd_seq_client *client)
2429 struct snd_seq_client_port *p;
2431 mutex_lock(&client->ports_mutex);
2432 list_for_each_entry(p, &client->ports_list_head, list) {
2433 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2434 p->addr.port, p->name,
2435 FLAG_PERM_RD(p->capability),
2436 FLAG_PERM_WR(p->capability),
2437 FLAG_PERM_EX(p->capability),
2438 FLAG_PERM_DUPLEX(p->capability));
2439 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2440 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2442 mutex_unlock(&client->ports_mutex);
2446 /* exported to seq_info.c */
2447 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2448 struct snd_info_buffer *buffer)
2451 struct snd_seq_client *client;
2453 snd_iprintf(buffer, "Client info\n");
2454 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2455 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2456 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2457 snd_iprintf(buffer, "\n");
2459 /* list the client table */
2460 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2461 client = snd_seq_client_use_ptr(c);
2464 if (client->type == NO_CLIENT) {
2465 snd_seq_client_unlock(client);
2469 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2471 client->type == USER_CLIENT ? "User" : "Kernel");
2472 snd_seq_info_dump_ports(buffer, client);
2473 if (snd_seq_write_pool_allocated(client)) {
2474 snd_iprintf(buffer, " Output pool :\n");
2475 snd_seq_info_pool(buffer, client->pool, " ");
2477 if (client->type == USER_CLIENT && client->data.user.fifo &&
2478 client->data.user.fifo->pool) {
2479 snd_iprintf(buffer, " Input pool :\n");
2480 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2482 snd_seq_client_unlock(client);
2485 #endif /* CONFIG_SND_PROC_FS */
2487 /*---------------------------------------------------------------------------*/
2494 static const struct file_operations snd_seq_f_ops =
2496 .owner = THIS_MODULE,
2497 .read = snd_seq_read,
2498 .write = snd_seq_write,
2499 .open = snd_seq_open,
2500 .release = snd_seq_release,
2501 .llseek = no_llseek,
2502 .poll = snd_seq_poll,
2503 .unlocked_ioctl = snd_seq_ioctl,
2504 .compat_ioctl = snd_seq_ioctl_compat,
2507 static struct device seq_dev;
2510 * register sequencer device
2512 int __init snd_sequencer_device_init(void)
2516 snd_device_initialize(&seq_dev, NULL);
2517 dev_set_name(&seq_dev, "seq");
2519 mutex_lock(®ister_mutex);
2520 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2521 &snd_seq_f_ops, NULL, &seq_dev);
2522 mutex_unlock(®ister_mutex);
2524 put_device(&seq_dev);
2534 * unregister sequencer device
2536 void snd_sequencer_device_done(void)
2538 snd_unregister_device(&seq_dev);
2539 put_device(&seq_dev);